diff options
Diffstat (limited to 'src/or/routerparse.c')
| -rw-r--r-- | src/or/routerparse.c | 6361 |
1 files changed, 0 insertions, 6361 deletions
diff --git a/src/or/routerparse.c b/src/or/routerparse.c deleted file mode 100644 index 37d2d975fc..0000000000 --- a/src/or/routerparse.c +++ /dev/null @@ -1,6361 +0,0 @@ -/* Copyright (c) 2001 Matej Pfajfar. - * Copyright (c) 2001-2004, Roger Dingledine. - * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. - * Copyright (c) 2007-2016, The Tor Project, Inc. */ -/* See LICENSE for licensing information */ - -/** - * \file routerparse.c - * \brief Code to parse and validate router descriptors, consenus directories, - * and similar objects. - * - * The objects parsed by this module use a common text-based metaformat, - * documented in dir-spec.txt in torspec.git. This module is itself divided - * into two major kinds of function: code to handle the metaformat, and code - * to convert from particular instances of the metaformat into the - * objects that Tor uses. - * - * The generic parsing code works by calling a table-based tokenizer on the - * input string. Each token corresponds to a single line with a token, plus - * optional arguments on that line, plus an optional base-64 encoded object - * after that line. Each token has a definition in a table of token_rule_t - * entries that describes how many arguments it can take, whether it takes an - * object, how many times it may appear, whether it must appear first, and so - * on. - * - * The tokenizer function tokenize_string() converts its string input into a - * smartlist full of instances of directory_token_t, according to a provided - * table of token_rule_t. - * - * The generic parts of this module additionally include functions for - * finding the start and end of signed information inside a signed object, and - * computing the digest that will be signed. - * - * There are also functions for saving objects to disk that have caused - * parsing to fail. - * - * The specific parts of this module describe conversions between - * particular lists of directory_token_t and particular objects. The - * kinds of objects that can be parsed here are: - * <ul> - * <li>router descriptors (managed from routerlist.c) - * <li>extra-info documents (managed from routerlist.c) - * <li>microdescriptors (managed from microdesc.c) - * <li>vote and consensus networkstatus documents, and the routerstatus_t - * objects that they comprise (managed from networkstatus.c) - * <li>detached-signature objects used by authorities for gathering - * signatures on the networkstatus consensus (managed from dirvote.c) - * <li>authority key certificates (managed from routerlist.c) - * <li>hidden service descriptors (managed from rendcommon.c and rendcache.c) - * </ul> - * - * For no terribly good reason, the functions to <i>generate</i> signatures on - * the above directory objects are also in this module. - **/ - -#define ROUTERPARSE_PRIVATE - -#include "or.h" -#include "config.h" -#include "circuitstats.h" -#include "dirserv.h" -#include "dirvote.h" -#include "policies.h" -#include "protover.h" -#include "rendcommon.h" -#include "router.h" -#include "routerlist.h" -#include "memarea.h" -#include "microdesc.h" -#include "networkstatus.h" -#include "rephist.h" -#include "routerkeys.h" -#include "routerparse.h" -#include "entrynodes.h" -#include "torcert.h" -#include "sandbox.h" -#include "shared_random.h" - -#undef log -#include <math.h> - -/****************************************************************************/ - -/** Enumeration of possible token types. The ones starting with K_ correspond - * to directory 'keywords'. A_ is for an annotation, R or C is related to - * hidden services, ERR_ is an error in the tokenizing process, EOF_ is an - * end-of-file marker, and NIL_ is used to encode not-a-token. - */ -typedef enum { - K_ACCEPT = 0, - K_ACCEPT6, - K_DIRECTORY_SIGNATURE, - K_RECOMMENDED_SOFTWARE, - K_REJECT, - K_REJECT6, - K_ROUTER, - K_SIGNED_DIRECTORY, - K_SIGNING_KEY, - K_ONION_KEY, - K_ONION_KEY_NTOR, - K_ROUTER_SIGNATURE, - K_PUBLISHED, - K_RUNNING_ROUTERS, - K_ROUTER_STATUS, - K_PLATFORM, - K_PROTO, - K_OPT, - K_BANDWIDTH, - K_CONTACT, - K_NETWORK_STATUS, - K_UPTIME, - K_DIR_SIGNING_KEY, - K_FAMILY, - K_FINGERPRINT, - K_HIBERNATING, - K_READ_HISTORY, - K_WRITE_HISTORY, - K_NETWORK_STATUS_VERSION, - K_DIR_SOURCE, - K_DIR_OPTIONS, - K_CLIENT_VERSIONS, - K_SERVER_VERSIONS, - K_RECOMMENDED_CLIENT_PROTOCOLS, - K_RECOMMENDED_RELAY_PROTOCOLS, - K_REQUIRED_CLIENT_PROTOCOLS, - K_REQUIRED_RELAY_PROTOCOLS, - K_OR_ADDRESS, - K_ID, - K_P, - K_P6, - K_R, - K_A, - K_S, - K_V, - K_W, - K_M, - K_EXTRA_INFO, - K_EXTRA_INFO_DIGEST, - K_CACHES_EXTRA_INFO, - K_HIDDEN_SERVICE_DIR, - K_ALLOW_SINGLE_HOP_EXITS, - K_IPV6_POLICY, - K_ROUTER_SIG_ED25519, - K_IDENTITY_ED25519, - K_MASTER_KEY_ED25519, - K_ONION_KEY_CROSSCERT, - K_NTOR_ONION_KEY_CROSSCERT, - - K_DIRREQ_END, - K_DIRREQ_V2_IPS, - K_DIRREQ_V3_IPS, - K_DIRREQ_V2_REQS, - K_DIRREQ_V3_REQS, - K_DIRREQ_V2_SHARE, - K_DIRREQ_V3_SHARE, - K_DIRREQ_V2_RESP, - K_DIRREQ_V3_RESP, - K_DIRREQ_V2_DIR, - K_DIRREQ_V3_DIR, - K_DIRREQ_V2_TUN, - K_DIRREQ_V3_TUN, - K_ENTRY_END, - K_ENTRY_IPS, - K_CELL_END, - K_CELL_PROCESSED, - K_CELL_QUEUED, - K_CELL_TIME, - K_CELL_CIRCS, - K_EXIT_END, - K_EXIT_WRITTEN, - K_EXIT_READ, - K_EXIT_OPENED, - - K_DIR_KEY_CERTIFICATE_VERSION, - K_DIR_IDENTITY_KEY, - K_DIR_KEY_PUBLISHED, - K_DIR_KEY_EXPIRES, - K_DIR_KEY_CERTIFICATION, - K_DIR_KEY_CROSSCERT, - K_DIR_ADDRESS, - K_DIR_TUNNELLED, - - K_VOTE_STATUS, - K_VALID_AFTER, - K_FRESH_UNTIL, - K_VALID_UNTIL, - K_VOTING_DELAY, - - K_KNOWN_FLAGS, - K_PARAMS, - K_BW_WEIGHTS, - K_VOTE_DIGEST, - K_CONSENSUS_DIGEST, - K_ADDITIONAL_DIGEST, - K_ADDITIONAL_SIGNATURE, - K_CONSENSUS_METHODS, - K_CONSENSUS_METHOD, - K_LEGACY_DIR_KEY, - K_DIRECTORY_FOOTER, - K_SIGNING_CERT_ED, - K_SR_FLAG, - K_COMMIT, - K_PREVIOUS_SRV, - K_CURRENT_SRV, - K_PACKAGE, - - A_PURPOSE, - A_LAST_LISTED, - A_UNKNOWN_, - - R_RENDEZVOUS_SERVICE_DESCRIPTOR, - R_VERSION, - R_PERMANENT_KEY, - R_SECRET_ID_PART, - R_PUBLICATION_TIME, - R_PROTOCOL_VERSIONS, - R_INTRODUCTION_POINTS, - R_SIGNATURE, - - R_IPO_IDENTIFIER, - R_IPO_IP_ADDRESS, - R_IPO_ONION_PORT, - R_IPO_ONION_KEY, - R_IPO_SERVICE_KEY, - - C_CLIENT_NAME, - C_DESCRIPTOR_COOKIE, - C_CLIENT_KEY, - - ERR_, - EOF_, - NIL_ -} directory_keyword; - -#define MIN_ANNOTATION A_PURPOSE -#define MAX_ANNOTATION A_UNKNOWN_ - -/** Structure to hold a single directory token. - * - * We parse a directory by breaking it into "tokens", each consisting - * of a keyword, a line full of arguments, and a binary object. The - * arguments and object are both optional, depending on the keyword - * type. - * - * This structure is only allocated in memareas; do not allocate it on - * the heap, or token_clear() won't work. - */ -typedef struct directory_token_t { - directory_keyword tp; /**< Type of the token. */ - int n_args:30; /**< Number of elements in args */ - char **args; /**< Array of arguments from keyword line. */ - - char *object_type; /**< -----BEGIN [object_type]-----*/ - size_t object_size; /**< Bytes in object_body */ - char *object_body; /**< Contents of object, base64-decoded. */ - - crypto_pk_t *key; /**< For public keys only. Heap-allocated. */ - - char *error; /**< For ERR_ tokens only. */ -} directory_token_t; - -/* ********************************************************************** */ - -/** We use a table of rules to decide how to parse each token type. */ - -/** Rules for whether the keyword needs an object. */ -typedef enum { - NO_OBJ, /**< No object, ever. */ - NEED_OBJ, /**< Object is required. */ - NEED_SKEY_1024,/**< Object is required, and must be a 1024 bit private key */ - NEED_KEY_1024, /**< Object is required, and must be a 1024 bit public key */ - NEED_KEY, /**< Object is required, and must be a public key. */ - OBJ_OK, /**< Object is optional. */ -} obj_syntax; - -#define AT_START 1 -#define AT_END 2 - -/** Determines the parsing rules for a single token type. */ -typedef struct token_rule_t { - /** The string value of the keyword identifying the type of item. */ - const char *t; - /** The corresponding directory_keyword enum. */ - directory_keyword v; - /** Minimum number of arguments for this item */ - int min_args; - /** Maximum number of arguments for this item */ - int max_args; - /** If true, we concatenate all arguments for this item into a single - * string. */ - int concat_args; - /** Requirements on object syntax for this item. */ - obj_syntax os; - /** Lowest number of times this item may appear in a document. */ - int min_cnt; - /** Highest number of times this item may appear in a document. */ - int max_cnt; - /** One or more of AT_START/AT_END to limit where the item may appear in a - * document. */ - int pos; - /** True iff this token is an annotation. */ - int is_annotation; -} token_rule_t; - -/** - * @name macros for defining token rules - * - * Helper macros to define token tables. 's' is a string, 't' is a - * directory_keyword, 'a' is a trio of argument multiplicities, and 'o' is an - * object syntax. - */ -/**@{*/ - -/** Appears to indicate the end of a table. */ -#define END_OF_TABLE { NULL, NIL_, 0,0,0, NO_OBJ, 0, INT_MAX, 0, 0 } -/** An item with no restrictions: used for obsolete document types */ -#define T(s,t,a,o) { s, t, a, o, 0, INT_MAX, 0, 0 } -/** An item with no restrictions on multiplicity or location. */ -#define T0N(s,t,a,o) { s, t, a, o, 0, INT_MAX, 0, 0 } -/** An item that must appear exactly once */ -#define T1(s,t,a,o) { s, t, a, o, 1, 1, 0, 0 } -/** An item that must appear exactly once, at the start of the document */ -#define T1_START(s,t,a,o) { s, t, a, o, 1, 1, AT_START, 0 } -/** An item that must appear exactly once, at the end of the document */ -#define T1_END(s,t,a,o) { s, t, a, o, 1, 1, AT_END, 0 } -/** An item that must appear one or more times */ -#define T1N(s,t,a,o) { s, t, a, o, 1, INT_MAX, 0, 0 } -/** An item that must appear no more than once */ -#define T01(s,t,a,o) { s, t, a, o, 0, 1, 0, 0 } -/** An annotation that must appear no more than once */ -#define A01(s,t,a,o) { s, t, a, o, 0, 1, 0, 1 } - -/** Argument multiplicity: any number of arguments. */ -#define ARGS 0,INT_MAX,0 -/** Argument multiplicity: no arguments. */ -#define NO_ARGS 0,0,0 -/** Argument multiplicity: concatenate all arguments. */ -#define CONCAT_ARGS 1,1,1 -/** Argument multiplicity: at least <b>n</b> arguments. */ -#define GE(n) n,INT_MAX,0 -/** Argument multiplicity: exactly <b>n</b> arguments. */ -#define EQ(n) n,n,0 -/**@}*/ - -/** List of tokens recognized in router descriptors */ -static token_rule_t routerdesc_token_table[] = { - T0N("reject", K_REJECT, ARGS, NO_OBJ ), - T0N("accept", K_ACCEPT, ARGS, NO_OBJ ), - T0N("reject6", K_REJECT6, ARGS, NO_OBJ ), - T0N("accept6", K_ACCEPT6, ARGS, NO_OBJ ), - T1_START( "router", K_ROUTER, GE(5), NO_OBJ ), - T01("ipv6-policy", K_IPV6_POLICY, CONCAT_ARGS, NO_OBJ), - T1( "signing-key", K_SIGNING_KEY, NO_ARGS, NEED_KEY_1024 ), - T1( "onion-key", K_ONION_KEY, NO_ARGS, NEED_KEY_1024 ), - T01("ntor-onion-key", K_ONION_KEY_NTOR, GE(1), NO_OBJ ), - T1_END( "router-signature", K_ROUTER_SIGNATURE, NO_ARGS, NEED_OBJ ), - T1( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ), - T01("uptime", K_UPTIME, GE(1), NO_OBJ ), - T01("fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ), - T01("hibernating", K_HIBERNATING, GE(1), NO_OBJ ), - T01("platform", K_PLATFORM, CONCAT_ARGS, NO_OBJ ), - T01("proto", K_PROTO, CONCAT_ARGS, NO_OBJ ), - T01("contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), - T01("read-history", K_READ_HISTORY, ARGS, NO_OBJ ), - T01("write-history", K_WRITE_HISTORY, ARGS, NO_OBJ ), - T01("extra-info-digest", K_EXTRA_INFO_DIGEST, GE(1), NO_OBJ ), - T01("hidden-service-dir", K_HIDDEN_SERVICE_DIR, NO_ARGS, NO_OBJ ), - T01("identity-ed25519", K_IDENTITY_ED25519, NO_ARGS, NEED_OBJ ), - T01("master-key-ed25519", K_MASTER_KEY_ED25519, GE(1), NO_OBJ ), - T01("router-sig-ed25519", K_ROUTER_SIG_ED25519, GE(1), NO_OBJ ), - T01("onion-key-crosscert", K_ONION_KEY_CROSSCERT, NO_ARGS, NEED_OBJ ), - T01("ntor-onion-key-crosscert", K_NTOR_ONION_KEY_CROSSCERT, - EQ(1), NEED_OBJ ), - - T01("allow-single-hop-exits",K_ALLOW_SINGLE_HOP_EXITS, NO_ARGS, NO_OBJ ), - - T01("family", K_FAMILY, ARGS, NO_OBJ ), - T01("caches-extra-info", K_CACHES_EXTRA_INFO, NO_ARGS, NO_OBJ ), - T0N("or-address", K_OR_ADDRESS, GE(1), NO_OBJ ), - - T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), - T1( "bandwidth", K_BANDWIDTH, GE(3), NO_OBJ ), - A01("@purpose", A_PURPOSE, GE(1), NO_OBJ ), - T01("tunnelled-dir-server",K_DIR_TUNNELLED, NO_ARGS, NO_OBJ ), - - END_OF_TABLE -}; - -/** List of tokens recognized in extra-info documents. */ -static token_rule_t extrainfo_token_table[] = { - T1_END( "router-signature", K_ROUTER_SIGNATURE, NO_ARGS, NEED_OBJ ), - T1( "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ), - T01("identity-ed25519", K_IDENTITY_ED25519, NO_ARGS, NEED_OBJ ), - T01("router-sig-ed25519", K_ROUTER_SIG_ED25519, GE(1), NO_OBJ ), - T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), - T01("read-history", K_READ_HISTORY, ARGS, NO_OBJ ), - T01("write-history", K_WRITE_HISTORY, ARGS, NO_OBJ ), - T01("dirreq-stats-end", K_DIRREQ_END, ARGS, NO_OBJ ), - T01("dirreq-v2-ips", K_DIRREQ_V2_IPS, ARGS, NO_OBJ ), - T01("dirreq-v3-ips", K_DIRREQ_V3_IPS, ARGS, NO_OBJ ), - T01("dirreq-v2-reqs", K_DIRREQ_V2_REQS, ARGS, NO_OBJ ), - T01("dirreq-v3-reqs", K_DIRREQ_V3_REQS, ARGS, NO_OBJ ), - T01("dirreq-v2-share", K_DIRREQ_V2_SHARE, ARGS, NO_OBJ ), - T01("dirreq-v3-share", K_DIRREQ_V3_SHARE, ARGS, NO_OBJ ), - T01("dirreq-v2-resp", K_DIRREQ_V2_RESP, ARGS, NO_OBJ ), - T01("dirreq-v3-resp", K_DIRREQ_V3_RESP, ARGS, NO_OBJ ), - T01("dirreq-v2-direct-dl", K_DIRREQ_V2_DIR, ARGS, NO_OBJ ), - T01("dirreq-v3-direct-dl", K_DIRREQ_V3_DIR, ARGS, NO_OBJ ), - T01("dirreq-v2-tunneled-dl", K_DIRREQ_V2_TUN, ARGS, NO_OBJ ), - T01("dirreq-v3-tunneled-dl", K_DIRREQ_V3_TUN, ARGS, NO_OBJ ), - T01("entry-stats-end", K_ENTRY_END, ARGS, NO_OBJ ), - T01("entry-ips", K_ENTRY_IPS, ARGS, NO_OBJ ), - T01("cell-stats-end", K_CELL_END, ARGS, NO_OBJ ), - T01("cell-processed-cells", K_CELL_PROCESSED, ARGS, NO_OBJ ), - T01("cell-queued-cells", K_CELL_QUEUED, ARGS, NO_OBJ ), - T01("cell-time-in-queue", K_CELL_TIME, ARGS, NO_OBJ ), - T01("cell-circuits-per-decile", K_CELL_CIRCS, ARGS, NO_OBJ ), - T01("exit-stats-end", K_EXIT_END, ARGS, NO_OBJ ), - T01("exit-kibibytes-written", K_EXIT_WRITTEN, ARGS, NO_OBJ ), - T01("exit-kibibytes-read", K_EXIT_READ, ARGS, NO_OBJ ), - T01("exit-streams-opened", K_EXIT_OPENED, ARGS, NO_OBJ ), - - T1_START( "extra-info", K_EXTRA_INFO, GE(2), NO_OBJ ), - - END_OF_TABLE -}; - -/** List of tokens recognized in the body part of v3 networkstatus - * documents. */ -static token_rule_t rtrstatus_token_table[] = { - T01("p", K_P, CONCAT_ARGS, NO_OBJ ), - T1( "r", K_R, GE(7), NO_OBJ ), - T0N("a", K_A, GE(1), NO_OBJ ), - T1( "s", K_S, ARGS, NO_OBJ ), - T01("v", K_V, CONCAT_ARGS, NO_OBJ ), - T01("w", K_W, ARGS, NO_OBJ ), - T0N("m", K_M, CONCAT_ARGS, NO_OBJ ), - T0N("id", K_ID, GE(2), NO_OBJ ), - T01("pr", K_PROTO, CONCAT_ARGS, NO_OBJ ), - T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), - END_OF_TABLE -}; - -/** List of tokens common to V3 authority certificates and V3 consensuses. */ -#define CERTIFICATE_MEMBERS \ - T1("dir-key-certificate-version", K_DIR_KEY_CERTIFICATE_VERSION, \ - GE(1), NO_OBJ ), \ - T1("dir-identity-key", K_DIR_IDENTITY_KEY, NO_ARGS, NEED_KEY ),\ - T1("dir-key-published",K_DIR_KEY_PUBLISHED, CONCAT_ARGS, NO_OBJ), \ - T1("dir-key-expires", K_DIR_KEY_EXPIRES, CONCAT_ARGS, NO_OBJ), \ - T1("dir-signing-key", K_DIR_SIGNING_KEY, NO_ARGS, NEED_KEY ),\ - T1("dir-key-crosscert", K_DIR_KEY_CROSSCERT, NO_ARGS, NEED_OBJ ),\ - T1("dir-key-certification", K_DIR_KEY_CERTIFICATION, \ - NO_ARGS, NEED_OBJ), \ - T01("dir-address", K_DIR_ADDRESS, GE(1), NO_OBJ), - -/** List of tokens recognized in V3 authority certificates. */ -static token_rule_t dir_key_certificate_table[] = { - CERTIFICATE_MEMBERS - T1("fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ), - END_OF_TABLE -}; - -/** List of tokens recognized in rendezvous service descriptors */ -static token_rule_t desc_token_table[] = { - T1_START("rendezvous-service-descriptor", R_RENDEZVOUS_SERVICE_DESCRIPTOR, - EQ(1), NO_OBJ), - T1("version", R_VERSION, EQ(1), NO_OBJ), - T1("permanent-key", R_PERMANENT_KEY, NO_ARGS, NEED_KEY_1024), - T1("secret-id-part", R_SECRET_ID_PART, EQ(1), NO_OBJ), - T1("publication-time", R_PUBLICATION_TIME, CONCAT_ARGS, NO_OBJ), - T1("protocol-versions", R_PROTOCOL_VERSIONS, EQ(1), NO_OBJ), - T01("introduction-points", R_INTRODUCTION_POINTS, NO_ARGS, NEED_OBJ), - T1_END("signature", R_SIGNATURE, NO_ARGS, NEED_OBJ), - END_OF_TABLE -}; - -/** List of tokens recognized in the (encrypted) list of introduction points of - * rendezvous service descriptors */ -static token_rule_t ipo_token_table[] = { - T1_START("introduction-point", R_IPO_IDENTIFIER, EQ(1), NO_OBJ), - T1("ip-address", R_IPO_IP_ADDRESS, EQ(1), NO_OBJ), - T1("onion-port", R_IPO_ONION_PORT, EQ(1), NO_OBJ), - T1("onion-key", R_IPO_ONION_KEY, NO_ARGS, NEED_KEY_1024), - T1("service-key", R_IPO_SERVICE_KEY, NO_ARGS, NEED_KEY_1024), - END_OF_TABLE -}; - -/** List of tokens recognized in the (possibly encrypted) list of introduction - * points of rendezvous service descriptors */ -static token_rule_t client_keys_token_table[] = { - T1_START("client-name", C_CLIENT_NAME, CONCAT_ARGS, NO_OBJ), - T1("descriptor-cookie", C_DESCRIPTOR_COOKIE, EQ(1), NO_OBJ), - T01("client-key", C_CLIENT_KEY, NO_ARGS, NEED_SKEY_1024), - END_OF_TABLE -}; - -/** List of tokens recognized in V3 networkstatus votes. */ -static token_rule_t networkstatus_token_table[] = { - T1_START("network-status-version", K_NETWORK_STATUS_VERSION, - GE(1), NO_OBJ ), - T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ), - T1("published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ ), - T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), - T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), - T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), - T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ), - T1("known-flags", K_KNOWN_FLAGS, ARGS, NO_OBJ ), - T01("params", K_PARAMS, ARGS, NO_OBJ ), - T( "fingerprint", K_FINGERPRINT, CONCAT_ARGS, NO_OBJ ), - T01("signing-ed25519", K_SIGNING_CERT_ED, NO_ARGS , NEED_OBJ ), - T01("shared-rand-participate",K_SR_FLAG, NO_ARGS, NO_OBJ ), - T0N("shared-rand-commit", K_COMMIT, GE(3), NO_OBJ ), - T01("shared-rand-previous-value", K_PREVIOUS_SRV,EQ(2), NO_OBJ ), - T01("shared-rand-current-value", K_CURRENT_SRV, EQ(2), NO_OBJ ), - T0N("package", K_PACKAGE, CONCAT_ARGS, NO_OBJ ), - T01("recommended-client-protocols", K_RECOMMENDED_CLIENT_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - T01("recommended-relay-protocols", K_RECOMMENDED_RELAY_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - T01("required-client-protocols", K_REQUIRED_CLIENT_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - T01("required-relay-protocols", K_REQUIRED_RELAY_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - - CERTIFICATE_MEMBERS - - T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), - T1( "contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), - T1( "dir-source", K_DIR_SOURCE, GE(6), NO_OBJ ), - T01("legacy-dir-key", K_LEGACY_DIR_KEY, GE(1), NO_OBJ ), - T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ), - T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ), - T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ), - T1( "consensus-methods", K_CONSENSUS_METHODS, GE(1), NO_OBJ ), - - END_OF_TABLE -}; - -/** List of tokens recognized in V3 networkstatus consensuses. */ -static token_rule_t networkstatus_consensus_token_table[] = { - T1_START("network-status-version", K_NETWORK_STATUS_VERSION, - GE(1), NO_OBJ ), - T1("vote-status", K_VOTE_STATUS, GE(1), NO_OBJ ), - T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), - T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), - T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), - T1("voting-delay", K_VOTING_DELAY, GE(2), NO_OBJ ), - - T0N("opt", K_OPT, CONCAT_ARGS, OBJ_OK ), - - T1N("dir-source", K_DIR_SOURCE, GE(6), NO_OBJ ), - T1N("contact", K_CONTACT, CONCAT_ARGS, NO_OBJ ), - T1N("vote-digest", K_VOTE_DIGEST, GE(1), NO_OBJ ), - - T1( "known-flags", K_KNOWN_FLAGS, CONCAT_ARGS, NO_OBJ ), - - T01("client-versions", K_CLIENT_VERSIONS, CONCAT_ARGS, NO_OBJ ), - T01("server-versions", K_SERVER_VERSIONS, CONCAT_ARGS, NO_OBJ ), - T01("consensus-method", K_CONSENSUS_METHOD, EQ(1), NO_OBJ), - T01("params", K_PARAMS, ARGS, NO_OBJ ), - - T01("shared-rand-previous-value", K_PREVIOUS_SRV, EQ(2), NO_OBJ ), - T01("shared-rand-current-value", K_CURRENT_SRV, EQ(2), NO_OBJ ), - - T01("recommended-client-protocols", K_RECOMMENDED_CLIENT_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - T01("recommended-relay-protocols", K_RECOMMENDED_RELAY_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - T01("required-client-protocols", K_REQUIRED_CLIENT_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - T01("required-relay-protocols", K_REQUIRED_RELAY_PROTOCOLS, - CONCAT_ARGS, NO_OBJ ), - - END_OF_TABLE -}; - -/** List of tokens recognized in the footer of v1 directory footers. */ -static token_rule_t networkstatus_vote_footer_token_table[] = { - T01("directory-footer", K_DIRECTORY_FOOTER, NO_ARGS, NO_OBJ ), - T01("bandwidth-weights", K_BW_WEIGHTS, ARGS, NO_OBJ ), - T( "directory-signature", K_DIRECTORY_SIGNATURE, GE(2), NEED_OBJ ), - END_OF_TABLE -}; - -/** List of tokens recognized in detached networkstatus signature documents. */ -static token_rule_t networkstatus_detached_signature_token_table[] = { - T1_START("consensus-digest", K_CONSENSUS_DIGEST, GE(1), NO_OBJ ), - T("additional-digest", K_ADDITIONAL_DIGEST,GE(3), NO_OBJ ), - T1("valid-after", K_VALID_AFTER, CONCAT_ARGS, NO_OBJ ), - T1("fresh-until", K_FRESH_UNTIL, CONCAT_ARGS, NO_OBJ ), - T1("valid-until", K_VALID_UNTIL, CONCAT_ARGS, NO_OBJ ), - T("additional-signature", K_ADDITIONAL_SIGNATURE, GE(4), NEED_OBJ ), - T1N("directory-signature", K_DIRECTORY_SIGNATURE, GE(2), NEED_OBJ ), - END_OF_TABLE -}; - -/** List of tokens recognized in microdescriptors */ -static token_rule_t microdesc_token_table[] = { - T1_START("onion-key", K_ONION_KEY, NO_ARGS, NEED_KEY_1024), - T01("ntor-onion-key", K_ONION_KEY_NTOR, GE(1), NO_OBJ ), - T0N("id", K_ID, GE(2), NO_OBJ ), - T0N("a", K_A, GE(1), NO_OBJ ), - T01("family", K_FAMILY, ARGS, NO_OBJ ), - T01("p", K_P, CONCAT_ARGS, NO_OBJ ), - T01("p6", K_P6, CONCAT_ARGS, NO_OBJ ), - A01("@last-listed", A_LAST_LISTED, CONCAT_ARGS, NO_OBJ ), - END_OF_TABLE -}; - -#undef T - -/* static function prototypes */ -static int router_add_exit_policy(routerinfo_t *router,directory_token_t *tok); -static addr_policy_t *router_parse_addr_policy(directory_token_t *tok, - unsigned fmt_flags); -static addr_policy_t *router_parse_addr_policy_private(directory_token_t *tok); - -static int router_get_hash_impl_helper(const char *s, size_t s_len, - const char *start_str, - const char *end_str, char end_c, - const char **start_out, const char **end_out); -static int router_get_hash_impl(const char *s, size_t s_len, char *digest, - const char *start_str, const char *end_str, - char end_char, - digest_algorithm_t alg); -static int router_get_hashes_impl(const char *s, size_t s_len, - common_digests_t *digests, - const char *start_str, const char *end_str, - char end_char); -static void token_clear(directory_token_t *tok); -static smartlist_t *find_all_by_keyword(smartlist_t *s, directory_keyword k); -static smartlist_t *find_all_exitpolicy(smartlist_t *s); -static directory_token_t *find_by_keyword_(smartlist_t *s, - directory_keyword keyword, - const char *keyword_str); -#define find_by_keyword(s, keyword) find_by_keyword_((s), (keyword), #keyword) -static directory_token_t *find_opt_by_keyword(smartlist_t *s, - directory_keyword keyword); - -#define TS_ANNOTATIONS_OK 1 -#define TS_NOCHECK 2 -#define TS_NO_NEW_ANNOTATIONS 4 -static int tokenize_string(memarea_t *area, - const char *start, const char *end, - smartlist_t *out, - token_rule_t *table, - int flags); -static directory_token_t *get_next_token(memarea_t *area, - const char **s, - const char *eos, - token_rule_t *table); -#define CST_CHECK_AUTHORITY (1<<0) -#define CST_NO_CHECK_OBJTYPE (1<<1) -static int check_signature_token(const char *digest, - ssize_t digest_len, - directory_token_t *tok, - crypto_pk_t *pkey, - int flags, - const char *doctype); - -#undef DEBUG_AREA_ALLOC - -#ifdef DEBUG_AREA_ALLOC -#define DUMP_AREA(a,name) STMT_BEGIN \ - size_t alloc=0, used=0; \ - memarea_get_stats((a),&alloc,&used); \ - log_debug(LD_MM, "Area for %s has %lu allocated; using %lu.", \ - name, (unsigned long)alloc, (unsigned long)used); \ - STMT_END -#else -#define DUMP_AREA(a,name) STMT_NIL -#endif - -/* Dump mechanism for unparseable descriptors */ - -/** List of dumped descriptors for FIFO cleanup purposes */ -STATIC smartlist_t *descs_dumped = NULL; -/** Total size of dumped descriptors for FIFO cleanup */ -STATIC uint64_t len_descs_dumped = 0; -/** Directory to stash dumps in */ -static int have_dump_desc_dir = 0; -static int problem_with_dump_desc_dir = 0; - -#define DESC_DUMP_DATADIR_SUBDIR "unparseable-descs" -#define DESC_DUMP_BASE_FILENAME "unparseable-desc" - -/** Find the dump directory and check if we'll be able to create it */ -static void -dump_desc_init(void) -{ - char *dump_desc_dir; - - dump_desc_dir = get_datadir_fname(DESC_DUMP_DATADIR_SUBDIR); - - /* - * We just check for it, don't create it at this point; we'll - * create it when we need it if it isn't already there. - */ - if (check_private_dir(dump_desc_dir, CPD_CHECK, get_options()->User) < 0) { - /* Error, log and flag it as having a problem */ - log_notice(LD_DIR, - "Doesn't look like we'll be able to create descriptor dump " - "directory %s; dumps will be disabled.", - dump_desc_dir); - problem_with_dump_desc_dir = 1; - tor_free(dump_desc_dir); - return; - } - - /* Check if it exists */ - switch (file_status(dump_desc_dir)) { - case FN_DIR: - /* We already have a directory */ - have_dump_desc_dir = 1; - break; - case FN_NOENT: - /* Nothing, we'll need to create it later */ - have_dump_desc_dir = 0; - break; - case FN_ERROR: - /* Log and flag having a problem */ - log_notice(LD_DIR, - "Couldn't check whether descriptor dump directory %s already" - " exists: %s", - dump_desc_dir, strerror(errno)); - problem_with_dump_desc_dir = 1; - break; - case FN_FILE: - case FN_EMPTY: - default: - /* Something else was here! */ - log_notice(LD_DIR, - "Descriptor dump directory %s already exists and isn't a " - "directory", - dump_desc_dir); - problem_with_dump_desc_dir = 1; - } - - if (have_dump_desc_dir && !problem_with_dump_desc_dir) { - dump_desc_populate_fifo_from_directory(dump_desc_dir); - } - - tor_free(dump_desc_dir); -} - -/** Create the dump directory if needed and possible */ -static void -dump_desc_create_dir(void) -{ - char *dump_desc_dir; - - /* If the problem flag is set, skip it */ - if (problem_with_dump_desc_dir) return; - - /* Do we need it? */ - if (!have_dump_desc_dir) { - dump_desc_dir = get_datadir_fname(DESC_DUMP_DATADIR_SUBDIR); - - if (check_private_dir(dump_desc_dir, CPD_CREATE, - get_options()->User) < 0) { - log_notice(LD_DIR, - "Failed to create descriptor dump directory %s", - dump_desc_dir); - problem_with_dump_desc_dir = 1; - } - - /* Okay, we created it */ - have_dump_desc_dir = 1; - - tor_free(dump_desc_dir); - } -} - -/** Dump desc FIFO/cleanup; take ownership of the given filename, add it to - * the FIFO, and clean up the oldest entries to the extent they exceed the - * configured cap. If any old entries with a matching hash existed, they - * just got overwritten right before this was called and we should adjust - * the total size counter without deleting them. - */ -static void -dump_desc_fifo_add_and_clean(char *filename, const uint8_t *digest_sha256, - size_t len) -{ - dumped_desc_t *ent = NULL, *tmp; - uint64_t max_len; - - tor_assert(filename != NULL); - tor_assert(digest_sha256 != NULL); - - if (descs_dumped == NULL) { - /* We better have no length, then */ - tor_assert(len_descs_dumped == 0); - /* Make a smartlist */ - descs_dumped = smartlist_new(); - } - - /* Make a new entry to put this one in */ - ent = tor_malloc_zero(sizeof(*ent)); - ent->filename = filename; - ent->len = len; - ent->when = time(NULL); - memcpy(ent->digest_sha256, digest_sha256, DIGEST256_LEN); - - /* Do we need to do some cleanup? */ - max_len = get_options()->MaxUnparseableDescSizeToLog; - /* Iterate over the list until we've freed enough space */ - while (len > max_len - len_descs_dumped && - smartlist_len(descs_dumped) > 0) { - /* Get the oldest thing on the list */ - tmp = (dumped_desc_t *)(smartlist_get(descs_dumped, 0)); - - /* - * Check if it matches the filename we just added, so we don't delete - * something we just emitted if we get repeated identical descriptors. - */ - if (strcmp(tmp->filename, filename) != 0) { - /* Delete it and adjust the length counter */ - tor_unlink(tmp->filename); - tor_assert(len_descs_dumped >= tmp->len); - len_descs_dumped -= tmp->len; - log_info(LD_DIR, - "Deleting old unparseable descriptor dump %s due to " - "space limits", - tmp->filename); - } else { - /* - * Don't delete, but do adjust the counter since we will bump it - * later - */ - tor_assert(len_descs_dumped >= tmp->len); - len_descs_dumped -= tmp->len; - log_info(LD_DIR, - "Replacing old descriptor dump %s with new identical one", - tmp->filename); - } - - /* Free it and remove it from the list */ - smartlist_del_keeporder(descs_dumped, 0); - tor_free(tmp->filename); - tor_free(tmp); - } - - /* Append our entry to the end of the list and bump the counter */ - smartlist_add(descs_dumped, ent); - len_descs_dumped += len; -} - -/** Check if we already have a descriptor for this hash and move it to the - * head of the queue if so. Return 1 if one existed and 0 otherwise. - */ -static int -dump_desc_fifo_bump_hash(const uint8_t *digest_sha256) -{ - dumped_desc_t *match = NULL; - - tor_assert(digest_sha256); - - if (descs_dumped) { - /* Find a match if one exists */ - SMARTLIST_FOREACH_BEGIN(descs_dumped, dumped_desc_t *, ent) { - if (ent && - tor_memeq(ent->digest_sha256, digest_sha256, DIGEST256_LEN)) { - /* - * Save a pointer to the match and remove it from its current - * position. - */ - match = ent; - SMARTLIST_DEL_CURRENT_KEEPORDER(descs_dumped, ent); - break; - } - } SMARTLIST_FOREACH_END(ent); - - if (match) { - /* Update the timestamp */ - match->when = time(NULL); - /* Add it back at the end of the list */ - smartlist_add(descs_dumped, match); - - /* Indicate we found one */ - return 1; - } - } - - return 0; -} - -/** Clean up on exit; just memory, leave the dumps behind - */ -STATIC void -dump_desc_fifo_cleanup(void) -{ - if (descs_dumped) { - /* Free each descriptor */ - SMARTLIST_FOREACH_BEGIN(descs_dumped, dumped_desc_t *, ent) { - tor_assert(ent); - tor_free(ent->filename); - tor_free(ent); - } SMARTLIST_FOREACH_END(ent); - /* Free the list */ - smartlist_free(descs_dumped); - descs_dumped = NULL; - len_descs_dumped = 0; - } -} - -/** Handle one file for dump_desc_populate_fifo_from_directory(); make sure - * the filename is sensibly formed and matches the file content, and either - * return a dumped_desc_t for it or remove the file and return NULL. - */ -MOCK_IMPL(STATIC dumped_desc_t *, -dump_desc_populate_one_file, (const char *dirname, const char *f)) -{ - dumped_desc_t *ent = NULL; - char *path = NULL, *desc = NULL; - const char *digest_str; - char digest[DIGEST256_LEN], content_digest[DIGEST256_LEN]; - /* Expected prefix before digest in filenames */ - const char *f_pfx = DESC_DUMP_BASE_FILENAME "."; - /* - * Stat while reading; this is important in case the file - * contains a NUL character. - */ - struct stat st; - - /* Sanity-check args */ - tor_assert(dirname != NULL); - tor_assert(f != NULL); - - /* Form the full path */ - tor_asprintf(&path, "%s" PATH_SEPARATOR "%s", dirname, f); - - /* Check that f has the form DESC_DUMP_BASE_FILENAME.<digest256> */ - - if (!strcmpstart(f, f_pfx)) { - /* It matches the form, but is the digest parseable as such? */ - digest_str = f + strlen(f_pfx); - if (base16_decode(digest, DIGEST256_LEN, - digest_str, strlen(digest_str)) != DIGEST256_LEN) { - /* We failed to decode it */ - digest_str = NULL; - } - } else { - /* No match */ - digest_str = NULL; - } - - if (!digest_str) { - /* We couldn't get a sensible digest */ - log_notice(LD_DIR, - "Removing unrecognized filename %s from unparseable " - "descriptors directory", f); - tor_unlink(path); - /* We're done */ - goto done; - } - - /* - * The filename has the form DESC_DUMP_BASE_FILENAME "." <digest256> and - * we've decoded the digest. Next, check that we can read it and the - * content matches this digest. We are relying on the fact that if the - * file contains a '\0', read_file_to_str() will allocate space for and - * read the entire file and return the correct size in st. - */ - desc = read_file_to_str(path, RFTS_IGNORE_MISSING|RFTS_BIN, &st); - if (!desc) { - /* We couldn't read it */ - log_notice(LD_DIR, - "Failed to read %s from unparseable descriptors directory; " - "attempting to remove it.", f); - tor_unlink(path); - /* We're done */ - goto done; - } - -#if SIZE_MAX > UINT64_MAX - if (BUG((uint64_t)st.st_size > (uint64_t)SIZE_MAX)) { - /* LCOV_EXCL_START - * Should be impossible since RFTS above should have failed to read the - * huge file into RAM. */ - goto done; - /* LCOV_EXCL_STOP */ - } -#endif - if (BUG(st.st_size < 0)) { - /* LCOV_EXCL_START - * Should be impossible, since the OS isn't supposed to be b0rken. */ - goto done; - /* LCOV_EXCL_STOP */ - } - /* (Now we can be sure that st.st_size is safe to cast to a size_t.) */ - - /* - * We got one; now compute its digest and check that it matches the - * filename. - */ - if (crypto_digest256((char *)content_digest, desc, (size_t) st.st_size, - DIGEST_SHA256) != 0) { - /* Weird, but okay */ - log_info(LD_DIR, - "Unable to hash content of %s from unparseable descriptors " - "directory", f); - tor_unlink(path); - /* We're done */ - goto done; - } - - /* Compare the digests */ - if (tor_memneq(digest, content_digest, DIGEST256_LEN)) { - /* No match */ - log_info(LD_DIR, - "Hash of %s from unparseable descriptors directory didn't " - "match its filename; removing it", f); - tor_unlink(path); - /* We're done */ - goto done; - } - - /* Okay, it's a match, we should prepare ent */ - ent = tor_malloc_zero(sizeof(dumped_desc_t)); - ent->filename = path; - memcpy(ent->digest_sha256, digest, DIGEST256_LEN); - ent->len = (size_t) st.st_size; - ent->when = st.st_mtime; - /* Null out path so we don't free it out from under ent */ - path = NULL; - - done: - /* Free allocations if we had them */ - tor_free(desc); - tor_free(path); - - return ent; -} - -/** Sort helper for dump_desc_populate_fifo_from_directory(); compares - * the when field of dumped_desc_ts in a smartlist to put the FIFO in - * the correct order after reconstructing it from the directory. - */ -static int -dump_desc_compare_fifo_entries(const void **a_v, const void **b_v) -{ - const dumped_desc_t **a = (const dumped_desc_t **)a_v; - const dumped_desc_t **b = (const dumped_desc_t **)b_v; - - if ((a != NULL) && (*a != NULL)) { - if ((b != NULL) && (*b != NULL)) { - /* We have sensible dumped_desc_ts to compare */ - if ((*a)->when < (*b)->when) { - return -1; - } else if ((*a)->when == (*b)->when) { - return 0; - } else { - return 1; - } - } else { - /* - * We shouldn't see this, but what the hell, NULLs precede everythin - * else - */ - return 1; - } - } else { - return -1; - } -} - -/** Scan the contents of the directory, and update FIFO/counters; this will - * consistency-check descriptor dump filenames against hashes of descriptor - * dump file content, and remove any inconsistent/unreadable dumps, and then - * reconstruct the dump FIFO as closely as possible for the last time the - * tor process shut down. If a previous dump was repeated more than once and - * moved ahead in the FIFO, the mtime will not have been updated and the - * reconstructed order will be wrong, but will always be a permutation of - * the original. - */ -STATIC void -dump_desc_populate_fifo_from_directory(const char *dirname) -{ - smartlist_t *files = NULL; - dumped_desc_t *ent = NULL; - - tor_assert(dirname != NULL); - - /* Get a list of files */ - files = tor_listdir(dirname); - if (!files) { - log_notice(LD_DIR, - "Unable to get contents of unparseable descriptor dump " - "directory %s", - dirname); - return; - } - - /* - * Iterate through the list and decide which files should go in the - * FIFO and which should be purged. - */ - - SMARTLIST_FOREACH_BEGIN(files, char *, f) { - /* Try to get a FIFO entry */ - ent = dump_desc_populate_one_file(dirname, f); - if (ent) { - /* - * We got one; add it to the FIFO. No need for duplicate checking - * here since we just verified the name and digest match. - */ - - /* Make sure we have a list to add it to */ - if (!descs_dumped) { - descs_dumped = smartlist_new(); - len_descs_dumped = 0; - } - - /* Add it and adjust the counter */ - smartlist_add(descs_dumped, ent); - len_descs_dumped += ent->len; - } - /* - * If we didn't, we will have unlinked the file if necessary and - * possible, and emitted a log message about it, so just go on to - * the next. - */ - } SMARTLIST_FOREACH_END(f); - - /* Did we get anything? */ - if (descs_dumped != NULL) { - /* Sort the FIFO in order of increasing timestamp */ - smartlist_sort(descs_dumped, dump_desc_compare_fifo_entries); - - /* Log some stats */ - log_info(LD_DIR, - "Reloaded unparseable descriptor dump FIFO with %d dump(s) " - "totaling " U64_FORMAT " bytes", - smartlist_len(descs_dumped), U64_PRINTF_ARG(len_descs_dumped)); - } - - /* Free the original list */ - SMARTLIST_FOREACH(files, char *, f, tor_free(f)); - smartlist_free(files); -} - -/** For debugging purposes, dump unparseable descriptor *<b>desc</b> of - * type *<b>type</b> to file $DATADIR/unparseable-desc. Do not write more - * than one descriptor to disk per minute. If there is already such a - * file in the data directory, overwrite it. */ -STATIC void -dump_desc(const char *desc, const char *type) -{ - tor_assert(desc); - tor_assert(type); - size_t len; - /* The SHA256 of the string */ - uint8_t digest_sha256[DIGEST256_LEN]; - char digest_sha256_hex[HEX_DIGEST256_LEN+1]; - /* Filename to log it to */ - char *debugfile, *debugfile_base; - - /* Get the hash for logging purposes anyway */ - len = strlen(desc); - if (crypto_digest256((char *)digest_sha256, desc, len, - DIGEST_SHA256) != 0) { - log_info(LD_DIR, - "Unable to parse descriptor of type %s, and unable to even hash" - " it!", type); - goto err; - } - - base16_encode(digest_sha256_hex, sizeof(digest_sha256_hex), - (const char *)digest_sha256, sizeof(digest_sha256)); - - /* - * We mention type and hash in the main log; don't clutter up the files - * with anything but the exact dump. - */ - tor_asprintf(&debugfile_base, - DESC_DUMP_BASE_FILENAME ".%s", digest_sha256_hex); - debugfile = get_datadir_fname2(DESC_DUMP_DATADIR_SUBDIR, debugfile_base); - - /* - * Check if the sandbox is active or will become active; see comment - * below at the log message for why. - */ - if (!(sandbox_is_active() || get_options()->Sandbox)) { - if (len <= get_options()->MaxUnparseableDescSizeToLog) { - if (!dump_desc_fifo_bump_hash(digest_sha256)) { - /* Create the directory if needed */ - dump_desc_create_dir(); - /* Make sure we've got it */ - if (have_dump_desc_dir && !problem_with_dump_desc_dir) { - /* Write it, and tell the main log about it */ - write_str_to_file(debugfile, desc, 1); - log_info(LD_DIR, - "Unable to parse descriptor of type %s with hash %s and " - "length %lu. See file %s in data directory for details.", - type, digest_sha256_hex, (unsigned long)len, - debugfile_base); - dump_desc_fifo_add_and_clean(debugfile, digest_sha256, len); - /* Since we handed ownership over, don't free debugfile later */ - debugfile = NULL; - } else { - /* Problem with the subdirectory */ - log_info(LD_DIR, - "Unable to parse descriptor of type %s with hash %s and " - "length %lu. Descriptor not dumped because we had a " - "problem creating the " DESC_DUMP_DATADIR_SUBDIR - " subdirectory", - type, digest_sha256_hex, (unsigned long)len); - /* We do have to free debugfile in this case */ - } - } else { - /* We already had one with this hash dumped */ - log_info(LD_DIR, - "Unable to parse descriptor of type %s with hash %s and " - "length %lu. Descriptor not dumped because one with that " - "hash has already been dumped.", - type, digest_sha256_hex, (unsigned long)len); - /* We do have to free debugfile in this case */ - } - } else { - /* Just log that it happened without dumping */ - log_info(LD_DIR, - "Unable to parse descriptor of type %s with hash %s and " - "length %lu. Descriptor not dumped because it exceeds maximum" - " log size all by itself.", - type, digest_sha256_hex, (unsigned long)len); - /* We do have to free debugfile in this case */ - } - } else { - /* - * Not logging because the sandbox is active and seccomp2 apparently - * doesn't have a sensible way to allow filenames according to a pattern - * match. (If we ever figure out how to say "allow writes to /regex/", - * remove this checK). - */ - log_info(LD_DIR, - "Unable to parse descriptor of type %s with hash %s and " - "length %lu. Descriptor not dumped because the sandbox is " - "configured", - type, digest_sha256_hex, (unsigned long)len); - } - - tor_free(debugfile_base); - tor_free(debugfile); - - err: - return; -} - -/** Set <b>digest</b> to the SHA-1 digest of the hash of the directory in - * <b>s</b>. Return 0 on success, -1 on failure. - */ -int -router_get_dir_hash(const char *s, char *digest) -{ - return router_get_hash_impl(s, strlen(s), digest, - "signed-directory","\ndirectory-signature",'\n', - DIGEST_SHA1); -} - -/** Set <b>digest</b> to the SHA-1 digest of the hash of the first router in - * <b>s</b>. Return 0 on success, -1 on failure. - */ -int -router_get_router_hash(const char *s, size_t s_len, char *digest) -{ - return router_get_hash_impl(s, s_len, digest, - "router ","\nrouter-signature", '\n', - DIGEST_SHA1); -} - -/** Set <b>digests</b> to all the digests of the consensus document in - * <b>s</b> */ -int -router_get_networkstatus_v3_hashes(const char *s, common_digests_t *digests) -{ - return router_get_hashes_impl(s,strlen(s),digests, - "network-status-version", - "\ndirectory-signature", - ' '); -} - -/** Set <b>digest</b> to the SHA-1 digest of the hash of the <b>s_len</b>-byte - * extrainfo string at <b>s</b>. Return 0 on success, -1 on failure. */ -int -router_get_extrainfo_hash(const char *s, size_t s_len, char *digest) -{ - return router_get_hash_impl(s, s_len, digest, "extra-info", - "\nrouter-signature",'\n', DIGEST_SHA1); -} - -/** Helper: used to generate signatures for routers, directories and - * network-status objects. Given a <b>digest_len</b>-byte digest in - * <b>digest</b> and a secret <b>private_key</b>, generate an PKCS1-padded - * signature, BASE64-encode it, surround it with -----BEGIN/END----- pairs, - * and return the new signature on success or NULL on failure. - */ -char * -router_get_dirobj_signature(const char *digest, - size_t digest_len, - const crypto_pk_t *private_key) -{ - char *signature; - size_t i, keysize; - int siglen; - char *buf = NULL; - size_t buf_len; - /* overestimate of BEGIN/END lines total len. */ -#define BEGIN_END_OVERHEAD_LEN 64 - - keysize = crypto_pk_keysize(private_key); - signature = tor_malloc(keysize); - siglen = crypto_pk_private_sign(private_key, signature, keysize, - digest, digest_len); - if (siglen < 0) { - log_warn(LD_BUG,"Couldn't sign digest."); - goto err; - } - - /* The *2 here is a ridiculous overestimate of base-64 overhead. */ - buf_len = (siglen * 2) + BEGIN_END_OVERHEAD_LEN; - buf = tor_malloc(buf_len); - - if (strlcpy(buf, "-----BEGIN SIGNATURE-----\n", buf_len) >= buf_len) - goto truncated; - - i = strlen(buf); - if (base64_encode(buf+i, buf_len-i, signature, siglen, - BASE64_ENCODE_MULTILINE) < 0) { - log_warn(LD_BUG,"couldn't base64-encode signature"); - goto err; - } - - if (strlcat(buf, "-----END SIGNATURE-----\n", buf_len) >= buf_len) - goto truncated; - - tor_free(signature); - return buf; - - truncated: - log_warn(LD_BUG,"tried to exceed string length."); - err: - tor_free(signature); - tor_free(buf); - return NULL; -} - -/** Helper: used to generate signatures for routers, directories and - * network-status objects. Given a digest in <b>digest</b> and a secret - * <b>private_key</b>, generate a PKCS1-padded signature, BASE64-encode it, - * surround it with -----BEGIN/END----- pairs, and write it to the - * <b>buf_len</b>-byte buffer at <b>buf</b>. Return 0 on success, -1 on - * failure. - */ -int -router_append_dirobj_signature(char *buf, size_t buf_len, const char *digest, - size_t digest_len, crypto_pk_t *private_key) -{ - size_t sig_len, s_len; - char *sig = router_get_dirobj_signature(digest, digest_len, private_key); - if (!sig) { - log_warn(LD_BUG, "No signature generated"); - return -1; - } - sig_len = strlen(sig); - s_len = strlen(buf); - if (sig_len + s_len + 1 > buf_len) { - log_warn(LD_BUG, "Not enough room for signature"); - tor_free(sig); - return -1; - } - memcpy(buf+s_len, sig, sig_len+1); - tor_free(sig); - return 0; -} - -/** Return VS_RECOMMENDED if <b>myversion</b> is contained in - * <b>versionlist</b>. Else, return VS_EMPTY if versionlist has no - * entries. Else, return VS_OLD if every member of - * <b>versionlist</b> is newer than <b>myversion</b>. Else, return - * VS_NEW_IN_SERIES if there is at least one member of <b>versionlist</b> in - * the same series (major.minor.micro) as <b>myversion</b>, but no such member - * is newer than <b>myversion.</b>. Else, return VS_NEW if every member of - * <b>versionlist</b> is older than <b>myversion</b>. Else, return - * VS_UNRECOMMENDED. - * - * (versionlist is a comma-separated list of version strings, - * optionally prefixed with "Tor". Versions that can't be parsed are - * ignored.) - */ -version_status_t -tor_version_is_obsolete(const char *myversion, const char *versionlist) -{ - tor_version_t mine, other; - int found_newer = 0, found_older = 0, found_newer_in_series = 0, - found_any_in_series = 0, r, same; - version_status_t ret = VS_UNRECOMMENDED; - smartlist_t *version_sl; - - log_debug(LD_CONFIG,"Checking whether version '%s' is in '%s'", - myversion, versionlist); - - if (tor_version_parse(myversion, &mine)) { - log_err(LD_BUG,"I couldn't parse my own version (%s)", myversion); - tor_assert(0); - } - version_sl = smartlist_new(); - smartlist_split_string(version_sl, versionlist, ",", SPLIT_SKIP_SPACE, 0); - - if (!strlen(versionlist)) { /* no authorities cared or agreed */ - ret = VS_EMPTY; - goto done; - } - - SMARTLIST_FOREACH_BEGIN(version_sl, const char *, cp) { - if (!strcmpstart(cp, "Tor ")) - cp += 4; - - if (tor_version_parse(cp, &other)) { - /* Couldn't parse other; it can't be a match. */ - } else { - same = tor_version_same_series(&mine, &other); - if (same) - found_any_in_series = 1; - r = tor_version_compare(&mine, &other); - if (r==0) { - ret = VS_RECOMMENDED; - goto done; - } else if (r<0) { - found_newer = 1; - if (same) - found_newer_in_series = 1; - } else if (r>0) { - found_older = 1; - } - } - } SMARTLIST_FOREACH_END(cp); - - /* We didn't find the listed version. Is it new or old? */ - if (found_any_in_series && !found_newer_in_series && found_newer) { - ret = VS_NEW_IN_SERIES; - } else if (found_newer && !found_older) { - ret = VS_OLD; - } else if (found_older && !found_newer) { - ret = VS_NEW; - } else { - ret = VS_UNRECOMMENDED; - } - - done: - SMARTLIST_FOREACH(version_sl, char *, version, tor_free(version)); - smartlist_free(version_sl); - return ret; -} - -/** Return true iff <b>key</b> is allowed to sign directories. - */ -static int -dir_signing_key_is_trusted(crypto_pk_t *key) -{ - char digest[DIGEST_LEN]; - if (!key) return 0; - if (crypto_pk_get_digest(key, digest) < 0) { - log_warn(LD_DIR, "Error computing dir-signing-key digest"); - return 0; - } - if (!router_digest_is_trusted_dir(digest)) { - log_warn(LD_DIR, "Listed dir-signing-key is not trusted"); - return 0; - } - return 1; -} - -/** Check whether the object body of the token in <b>tok</b> has a good - * signature for <b>digest</b> using key <b>pkey</b>. If - * <b>CST_CHECK_AUTHORITY</b> is set, make sure that <b>pkey</b> is the key of - * a directory authority. If <b>CST_NO_CHECK_OBJTYPE</b> is set, do not check - * the object type of the signature object. Use <b>doctype</b> as the type of - * the document when generating log messages. Return 0 on success, negative - * on failure. - */ -static int -check_signature_token(const char *digest, - ssize_t digest_len, - directory_token_t *tok, - crypto_pk_t *pkey, - int flags, - const char *doctype) -{ - char *signed_digest; - size_t keysize; - const int check_authority = (flags & CST_CHECK_AUTHORITY); - const int check_objtype = ! (flags & CST_NO_CHECK_OBJTYPE); - - tor_assert(pkey); - tor_assert(tok); - tor_assert(digest); - tor_assert(doctype); - - if (check_authority && !dir_signing_key_is_trusted(pkey)) { - log_warn(LD_DIR, "Key on %s did not come from an authority; rejecting", - doctype); - return -1; - } - - if (check_objtype) { - if (strcmp(tok->object_type, "SIGNATURE")) { - log_warn(LD_DIR, "Bad object type on %s signature", doctype); - return -1; - } - } - - keysize = crypto_pk_keysize(pkey); - signed_digest = tor_malloc(keysize); - if (crypto_pk_public_checksig(pkey, signed_digest, keysize, - tok->object_body, tok->object_size) - < digest_len) { - log_warn(LD_DIR, "Error reading %s: invalid signature.", doctype); - tor_free(signed_digest); - return -1; - } - // log_debug(LD_DIR,"Signed %s hash starts %s", doctype, - // hex_str(signed_digest,4)); - if (tor_memneq(digest, signed_digest, digest_len)) { - log_warn(LD_DIR, "Error reading %s: signature does not match.", doctype); - tor_free(signed_digest); - return -1; - } - tor_free(signed_digest); - return 0; -} - -/** Helper: move *<b>s_ptr</b> ahead to the next router, the next extra-info, - * or to the first of the annotations proceeding the next router or - * extra-info---whichever comes first. Set <b>is_extrainfo_out</b> to true if - * we found an extrainfo, or false if found a router. Do not scan beyond - * <b>eos</b>. Return -1 if we found nothing; 0 if we found something. */ -static int -find_start_of_next_router_or_extrainfo(const char **s_ptr, - const char *eos, - int *is_extrainfo_out) -{ - const char *annotations = NULL; - const char *s = *s_ptr; - - s = eat_whitespace_eos(s, eos); - - while (s < eos-32) { /* 32 gives enough room for a the first keyword. */ - /* We're at the start of a line. */ - tor_assert(*s != '\n'); - - if (*s == '@' && !annotations) { - annotations = s; - } else if (*s == 'r' && !strcmpstart(s, "router ")) { - *s_ptr = annotations ? annotations : s; - *is_extrainfo_out = 0; - return 0; - } else if (*s == 'e' && !strcmpstart(s, "extra-info ")) { - *s_ptr = annotations ? annotations : s; - *is_extrainfo_out = 1; - return 0; - } - - if (!(s = memchr(s+1, '\n', eos-(s+1)))) - break; - s = eat_whitespace_eos(s, eos); - } - return -1; -} - -/** Given a string *<b>s</b> containing a concatenated sequence of router - * descriptors (or extra-info documents if <b>is_extrainfo</b> is set), parses - * them and stores the result in <b>dest</b>. All routers are marked running - * and valid. Advances *s to a point immediately following the last router - * entry. Ignore any trailing router entries that are not complete. - * - * If <b>saved_location</b> isn't SAVED_IN_CACHE, make a local copy of each - * descriptor in the signed_descriptor_body field of each routerinfo_t. If it - * isn't SAVED_NOWHERE, remember the offset of each descriptor. - * - * Returns 0 on success and -1 on failure. Adds a digest to - * <b>invalid_digests_out</b> for every entry that was unparseable or - * invalid. (This may cause duplicate entries.) - */ -int -router_parse_list_from_string(const char **s, const char *eos, - smartlist_t *dest, - saved_location_t saved_location, - int want_extrainfo, - int allow_annotations, - const char *prepend_annotations, - smartlist_t *invalid_digests_out) -{ - routerinfo_t *router; - extrainfo_t *extrainfo; - signed_descriptor_t *signed_desc = NULL; - void *elt; - const char *end, *start; - int have_extrainfo; - - tor_assert(s); - tor_assert(*s); - tor_assert(dest); - - start = *s; - if (!eos) - eos = *s + strlen(*s); - - tor_assert(eos >= *s); - - while (1) { - char raw_digest[DIGEST_LEN]; - int have_raw_digest = 0; - int dl_again = 0; - if (find_start_of_next_router_or_extrainfo(s, eos, &have_extrainfo) < 0) - break; - - end = tor_memstr(*s, eos-*s, "\nrouter-signature"); - if (end) - end = tor_memstr(end, eos-end, "\n-----END SIGNATURE-----\n"); - if (end) - end += strlen("\n-----END SIGNATURE-----\n"); - - if (!end) - break; - - elt = NULL; - - if (have_extrainfo && want_extrainfo) { - routerlist_t *rl = router_get_routerlist(); - have_raw_digest = router_get_extrainfo_hash(*s, end-*s, raw_digest) == 0; - extrainfo = extrainfo_parse_entry_from_string(*s, end, - saved_location != SAVED_IN_CACHE, - rl->identity_map, &dl_again); - if (extrainfo) { - signed_desc = &extrainfo->cache_info; - elt = extrainfo; - } - } else if (!have_extrainfo && !want_extrainfo) { - have_raw_digest = router_get_router_hash(*s, end-*s, raw_digest) == 0; - router = router_parse_entry_from_string(*s, end, - saved_location != SAVED_IN_CACHE, - allow_annotations, - prepend_annotations, &dl_again); - if (router) { - log_debug(LD_DIR, "Read router '%s', purpose '%s'", - router_describe(router), - router_purpose_to_string(router->purpose)); - signed_desc = &router->cache_info; - elt = router; - } - } - if (! elt && ! dl_again && have_raw_digest && invalid_digests_out) { - smartlist_add(invalid_digests_out, tor_memdup(raw_digest, DIGEST_LEN)); - } - if (!elt) { - *s = end; - continue; - } - if (saved_location != SAVED_NOWHERE) { - tor_assert(signed_desc); - signed_desc->saved_location = saved_location; - signed_desc->saved_offset = *s - start; - } - *s = end; - smartlist_add(dest, elt); - } - - return 0; -} - -/* For debugging: define to count every descriptor digest we've seen so we - * know if we need to try harder to avoid duplicate verifies. */ -#undef COUNT_DISTINCT_DIGESTS - -#ifdef COUNT_DISTINCT_DIGESTS -static digestmap_t *verified_digests = NULL; -#endif - -/** Log the total count of the number of distinct router digests we've ever - * verified. When compared to the number of times we've verified routerdesc - * signatures <i>in toto</i>, this will tell us if we're doing too much - * multiple-verification. */ -void -dump_distinct_digest_count(int severity) -{ -#ifdef COUNT_DISTINCT_DIGESTS - if (!verified_digests) - verified_digests = digestmap_new(); - tor_log(severity, LD_GENERAL, "%d *distinct* router digests verified", - digestmap_size(verified_digests)); -#else - (void)severity; /* suppress "unused parameter" warning */ -#endif -} - -/** Try to find an IPv6 OR port in <b>list</b> of directory_token_t's - * with at least one argument (use GE(1) in setup). If found, store - * address and port number to <b>addr_out</b> and - * <b>port_out</b>. Return number of OR ports found. */ -static int -find_single_ipv6_orport(const smartlist_t *list, - tor_addr_t *addr_out, - uint16_t *port_out) -{ - int ret = 0; - tor_assert(list != NULL); - tor_assert(addr_out != NULL); - tor_assert(port_out != NULL); - - SMARTLIST_FOREACH_BEGIN(list, directory_token_t *, t) { - tor_addr_t a; - maskbits_t bits; - uint16_t port_min, port_max; - tor_assert(t->n_args >= 1); - /* XXXX Prop186 the full spec allows much more than this. */ - if (tor_addr_parse_mask_ports(t->args[0], 0, - &a, &bits, &port_min, - &port_max) == AF_INET6 && - bits == 128 && - port_min == port_max) { - /* Okay, this is one we can understand. Use it and ignore - any potential more addresses in list. */ - tor_addr_copy(addr_out, &a); - *port_out = port_min; - ret = 1; - break; - } - } SMARTLIST_FOREACH_END(t); - - return ret; -} - -/** Helper function: reads a single router entry from *<b>s</b> ... - * *<b>end</b>. Mallocs a new router and returns it if all goes well, else - * returns NULL. If <b>cache_copy</b> is true, duplicate the contents of - * s through end into the signed_descriptor_body of the resulting - * routerinfo_t. - * - * If <b>end</b> is NULL, <b>s</b> must be properly NUL-terminated. - * - * If <b>allow_annotations</b>, it's okay to encounter annotations in <b>s</b> - * before the router; if it's false, reject the router if it's annotated. If - * <b>prepend_annotations</b> is set, it should contain some annotations: - * append them to the front of the router before parsing it, and keep them - * around when caching the router. - * - * Only one of allow_annotations and prepend_annotations may be set. - * - * If <b>can_dl_again_out</b> is provided, set *<b>can_dl_again_out</b> to 1 - * if it's okay to try to download a descriptor with this same digest again, - * and 0 if it isn't. (It might not be okay to download it again if part of - * the part covered by the digest is invalid.) - */ -routerinfo_t * -router_parse_entry_from_string(const char *s, const char *end, - int cache_copy, int allow_annotations, - const char *prepend_annotations, - int *can_dl_again_out) -{ - routerinfo_t *router = NULL; - char digest[128]; - smartlist_t *tokens = NULL, *exit_policy_tokens = NULL; - directory_token_t *tok; - struct in_addr in; - const char *start_of_annotations, *cp, *s_dup = s; - size_t prepend_len = prepend_annotations ? strlen(prepend_annotations) : 0; - int ok = 1; - memarea_t *area = NULL; - tor_cert_t *ntor_cc_cert = NULL; - /* Do not set this to '1' until we have parsed everything that we intend to - * parse that's covered by the hash. */ - int can_dl_again = 0; - - tor_assert(!allow_annotations || !prepend_annotations); - - if (!end) { - end = s + strlen(s); - } - - /* point 'end' to a point immediately after the final newline. */ - while (end > s+2 && *(end-1) == '\n' && *(end-2) == '\n') - --end; - - area = memarea_new(); - tokens = smartlist_new(); - if (prepend_annotations) { - if (tokenize_string(area,prepend_annotations,NULL,tokens, - routerdesc_token_table,TS_NOCHECK)) { - log_warn(LD_DIR, "Error tokenizing router descriptor (annotations)."); - goto err; - } - } - - start_of_annotations = s; - cp = tor_memstr(s, end-s, "\nrouter "); - if (!cp) { - if (end-s < 7 || strcmpstart(s, "router ")) { - log_warn(LD_DIR, "No router keyword found."); - goto err; - } - } else { - s = cp+1; - } - - if (start_of_annotations != s) { /* We have annotations */ - if (allow_annotations) { - if (tokenize_string(area,start_of_annotations,s,tokens, - routerdesc_token_table,TS_NOCHECK)) { - log_warn(LD_DIR, "Error tokenizing router descriptor (annotations)."); - goto err; - } - } else { - log_warn(LD_DIR, "Found unexpected annotations on router descriptor not " - "loaded from disk. Dropping it."); - goto err; - } - } - - if (router_get_router_hash(s, end - s, digest) < 0) { - log_warn(LD_DIR, "Couldn't compute router hash."); - goto err; - } - { - int flags = 0; - if (allow_annotations) - flags |= TS_ANNOTATIONS_OK; - if (prepend_annotations) - flags |= TS_ANNOTATIONS_OK|TS_NO_NEW_ANNOTATIONS; - - if (tokenize_string(area,s,end,tokens,routerdesc_token_table, flags)) { - log_warn(LD_DIR, "Error tokenizing router descriptor."); - goto err; - } - } - - if (smartlist_len(tokens) < 2) { - log_warn(LD_DIR, "Impossibly short router descriptor."); - goto err; - } - - tok = find_by_keyword(tokens, K_ROUTER); - const int router_token_pos = smartlist_pos(tokens, tok); - tor_assert(tok->n_args >= 5); - - router = tor_malloc_zero(sizeof(routerinfo_t)); - router->cert_expiration_time = TIME_MAX; - router->cache_info.routerlist_index = -1; - router->cache_info.annotations_len = s-start_of_annotations + prepend_len; - router->cache_info.signed_descriptor_len = end-s; - if (cache_copy) { - size_t len = router->cache_info.signed_descriptor_len + - router->cache_info.annotations_len; - char *signed_body = - router->cache_info.signed_descriptor_body = tor_malloc(len+1); - if (prepend_annotations) { - memcpy(signed_body, prepend_annotations, prepend_len); - signed_body += prepend_len; - } - /* This assertion will always succeed. - * len == signed_desc_len + annotations_len - * == end-s + s-start_of_annotations + prepend_len - * == end-start_of_annotations + prepend_len - * We already wrote prepend_len bytes into the buffer; now we're - * writing end-start_of_annotations -NM. */ - tor_assert(signed_body+(end-start_of_annotations) == - router->cache_info.signed_descriptor_body+len); - memcpy(signed_body, start_of_annotations, end-start_of_annotations); - router->cache_info.signed_descriptor_body[len] = '\0'; - tor_assert(strlen(router->cache_info.signed_descriptor_body) == len); - } - memcpy(router->cache_info.signed_descriptor_digest, digest, DIGEST_LEN); - - router->nickname = tor_strdup(tok->args[0]); - if (!is_legal_nickname(router->nickname)) { - log_warn(LD_DIR,"Router nickname is invalid"); - goto err; - } - if (!tor_inet_aton(tok->args[1], &in)) { - log_warn(LD_DIR,"Router address is not an IP address."); - goto err; - } - router->addr = ntohl(in.s_addr); - - router->or_port = - (uint16_t) tor_parse_long(tok->args[2],10,0,65535,&ok,NULL); - if (!ok) { - log_warn(LD_DIR,"Invalid OR port %s", escaped(tok->args[2])); - goto err; - } - router->dir_port = - (uint16_t) tor_parse_long(tok->args[4],10,0,65535,&ok,NULL); - if (!ok) { - log_warn(LD_DIR,"Invalid dir port %s", escaped(tok->args[4])); - goto err; - } - - tok = find_by_keyword(tokens, K_BANDWIDTH); - tor_assert(tok->n_args >= 3); - router->bandwidthrate = (int) - tor_parse_long(tok->args[0],10,1,INT_MAX,&ok,NULL); - - if (!ok) { - log_warn(LD_DIR, "bandwidthrate %s unreadable or 0. Failing.", - escaped(tok->args[0])); - goto err; - } - router->bandwidthburst = - (int) tor_parse_long(tok->args[1],10,0,INT_MAX,&ok,NULL); - if (!ok) { - log_warn(LD_DIR, "Invalid bandwidthburst %s", escaped(tok->args[1])); - goto err; - } - router->bandwidthcapacity = (int) - tor_parse_long(tok->args[2],10,0,INT_MAX,&ok,NULL); - if (!ok) { - log_warn(LD_DIR, "Invalid bandwidthcapacity %s", escaped(tok->args[1])); - goto err; - } - - if ((tok = find_opt_by_keyword(tokens, A_PURPOSE))) { - tor_assert(tok->n_args); - router->purpose = router_purpose_from_string(tok->args[0]); - } else { - router->purpose = ROUTER_PURPOSE_GENERAL; - } - router->cache_info.send_unencrypted = - (router->purpose == ROUTER_PURPOSE_GENERAL) ? 1 : 0; - - if ((tok = find_opt_by_keyword(tokens, K_UPTIME))) { - tor_assert(tok->n_args >= 1); - router->uptime = tor_parse_long(tok->args[0],10,0,LONG_MAX,&ok,NULL); - if (!ok) { - log_warn(LD_DIR, "Invalid uptime %s", escaped(tok->args[0])); - goto err; - } - } - - if ((tok = find_opt_by_keyword(tokens, K_HIBERNATING))) { - tor_assert(tok->n_args >= 1); - router->is_hibernating - = (tor_parse_long(tok->args[0],10,0,LONG_MAX,NULL,NULL) != 0); - } - - tok = find_by_keyword(tokens, K_PUBLISHED); - tor_assert(tok->n_args == 1); - if (parse_iso_time(tok->args[0], &router->cache_info.published_on) < 0) - goto err; - - tok = find_by_keyword(tokens, K_ONION_KEY); - if (!crypto_pk_public_exponent_ok(tok->key)) { - log_warn(LD_DIR, - "Relay's onion key had invalid exponent."); - goto err; - } - router->onion_pkey = tok->key; - tok->key = NULL; /* Prevent free */ - - if ((tok = find_opt_by_keyword(tokens, K_ONION_KEY_NTOR))) { - curve25519_public_key_t k; - tor_assert(tok->n_args >= 1); - if (curve25519_public_from_base64(&k, tok->args[0]) < 0) { - log_warn(LD_DIR, "Bogus ntor-onion-key in routerinfo"); - goto err; - } - router->onion_curve25519_pkey = - tor_memdup(&k, sizeof(curve25519_public_key_t)); - } - - tok = find_by_keyword(tokens, K_SIGNING_KEY); - router->identity_pkey = tok->key; - tok->key = NULL; /* Prevent free */ - if (crypto_pk_get_digest(router->identity_pkey, - router->cache_info.identity_digest)) { - log_warn(LD_DIR, "Couldn't calculate key digest"); goto err; - } - - { - directory_token_t *ed_sig_tok, *ed_cert_tok, *cc_tap_tok, *cc_ntor_tok, - *master_key_tok; - ed_sig_tok = find_opt_by_keyword(tokens, K_ROUTER_SIG_ED25519); - ed_cert_tok = find_opt_by_keyword(tokens, K_IDENTITY_ED25519); - master_key_tok = find_opt_by_keyword(tokens, K_MASTER_KEY_ED25519); - cc_tap_tok = find_opt_by_keyword(tokens, K_ONION_KEY_CROSSCERT); - cc_ntor_tok = find_opt_by_keyword(tokens, K_NTOR_ONION_KEY_CROSSCERT); - int n_ed_toks = !!ed_sig_tok + !!ed_cert_tok + - !!cc_tap_tok + !!cc_ntor_tok; - if ((n_ed_toks != 0 && n_ed_toks != 4) || - (n_ed_toks == 4 && !router->onion_curve25519_pkey)) { - log_warn(LD_DIR, "Router descriptor with only partial ed25519/" - "cross-certification support"); - goto err; - } - if (master_key_tok && !ed_sig_tok) { - log_warn(LD_DIR, "Router descriptor has ed25519 master key but no " - "certificate"); - goto err; - } - if (ed_sig_tok) { - tor_assert(ed_cert_tok && cc_tap_tok && cc_ntor_tok); - const int ed_cert_token_pos = smartlist_pos(tokens, ed_cert_tok); - if (ed_cert_token_pos == -1 || router_token_pos == -1 || - (ed_cert_token_pos != router_token_pos + 1 && - ed_cert_token_pos != router_token_pos - 1)) { - log_warn(LD_DIR, "Ed25519 certificate in wrong position"); - goto err; - } - if (ed_sig_tok != smartlist_get(tokens, smartlist_len(tokens)-2)) { - log_warn(LD_DIR, "Ed25519 signature in wrong position"); - goto err; - } - if (strcmp(ed_cert_tok->object_type, "ED25519 CERT")) { - log_warn(LD_DIR, "Wrong object type on identity-ed25519 in decriptor"); - goto err; - } - if (strcmp(cc_ntor_tok->object_type, "ED25519 CERT")) { - log_warn(LD_DIR, "Wrong object type on ntor-onion-key-crosscert " - "in decriptor"); - goto err; - } - if (strcmp(cc_tap_tok->object_type, "CROSSCERT")) { - log_warn(LD_DIR, "Wrong object type on onion-key-crosscert " - "in decriptor"); - goto err; - } - if (strcmp(cc_ntor_tok->args[0], "0") && - strcmp(cc_ntor_tok->args[0], "1")) { - log_warn(LD_DIR, "Bad sign bit on ntor-onion-key-crosscert"); - goto err; - } - int ntor_cc_sign_bit = !strcmp(cc_ntor_tok->args[0], "1"); - - uint8_t d256[DIGEST256_LEN]; - const char *signed_start, *signed_end; - tor_cert_t *cert = tor_cert_parse( - (const uint8_t*)ed_cert_tok->object_body, - ed_cert_tok->object_size); - if (! cert) { - log_warn(LD_DIR, "Couldn't parse ed25519 cert"); - goto err; - } - /* makes sure it gets freed. */ - router->cache_info.signing_key_cert = cert; - - if (cert->cert_type != CERT_TYPE_ID_SIGNING || - ! cert->signing_key_included) { - log_warn(LD_DIR, "Invalid form for ed25519 cert"); - goto err; - } - - if (master_key_tok) { - /* This token is optional, but if it's present, it must match - * the signature in the signing cert, or supplant it. */ - tor_assert(master_key_tok->n_args >= 1); - ed25519_public_key_t pkey; - if (ed25519_public_from_base64(&pkey, master_key_tok->args[0])<0) { - log_warn(LD_DIR, "Can't parse ed25519 master key"); - goto err; - } - - if (fast_memneq(&cert->signing_key.pubkey, - pkey.pubkey, ED25519_PUBKEY_LEN)) { - log_warn(LD_DIR, "Ed25519 master key does not match " - "key in certificate"); - goto err; - } - } - ntor_cc_cert = tor_cert_parse((const uint8_t*)cc_ntor_tok->object_body, - cc_ntor_tok->object_size); - if (!ntor_cc_cert) { - log_warn(LD_DIR, "Couldn't parse ntor-onion-key-crosscert cert"); - goto err; - } - if (ntor_cc_cert->cert_type != CERT_TYPE_ONION_ID || - ! ed25519_pubkey_eq(&ntor_cc_cert->signed_key, &cert->signing_key)) { - log_warn(LD_DIR, "Invalid contents for ntor-onion-key-crosscert cert"); - goto err; - } - - ed25519_public_key_t ntor_cc_pk; - if (ed25519_public_key_from_curve25519_public_key(&ntor_cc_pk, - router->onion_curve25519_pkey, - ntor_cc_sign_bit)<0) { - log_warn(LD_DIR, "Error converting onion key to ed25519"); - goto err; - } - - if (router_get_hash_impl_helper(s, end-s, "router ", - "\nrouter-sig-ed25519", - ' ', &signed_start, &signed_end) < 0) { - log_warn(LD_DIR, "Can't find ed25519-signed portion of descriptor"); - goto err; - } - crypto_digest_t *d = crypto_digest256_new(DIGEST_SHA256); - crypto_digest_add_bytes(d, ED_DESC_SIGNATURE_PREFIX, - strlen(ED_DESC_SIGNATURE_PREFIX)); - crypto_digest_add_bytes(d, signed_start, signed_end-signed_start); - crypto_digest_get_digest(d, (char*)d256, sizeof(d256)); - crypto_digest_free(d); - - ed25519_checkable_t check[3]; - int check_ok[3]; - if (tor_cert_get_checkable_sig(&check[0], cert, NULL) < 0) { - log_err(LD_BUG, "Couldn't create 'checkable' for cert."); - goto err; - } - if (tor_cert_get_checkable_sig(&check[1], - ntor_cc_cert, &ntor_cc_pk) < 0) { - log_err(LD_BUG, "Couldn't create 'checkable' for ntor_cc_cert."); - goto err; - } - - if (ed25519_signature_from_base64(&check[2].signature, - ed_sig_tok->args[0])<0) { - log_warn(LD_DIR, "Couldn't decode ed25519 signature"); - goto err; - } - check[2].pubkey = &cert->signed_key; - check[2].msg = d256; - check[2].len = DIGEST256_LEN; - - if (ed25519_checksig_batch(check_ok, check, 3) < 0) { - log_warn(LD_DIR, "Incorrect ed25519 signature(s)"); - goto err; - } - - if (check_tap_onion_key_crosscert( - (const uint8_t*)cc_tap_tok->object_body, - (int)cc_tap_tok->object_size, - router->onion_pkey, - &cert->signing_key, - (const uint8_t*)router->cache_info.identity_digest)<0) { - log_warn(LD_DIR, "Incorrect TAP cross-verification"); - goto err; - } - - /* We check this before adding it to the routerlist. */ - if (cert->valid_until < ntor_cc_cert->valid_until) - router->cert_expiration_time = cert->valid_until; - else - router->cert_expiration_time = ntor_cc_cert->valid_until; - } - } - - if ((tok = find_opt_by_keyword(tokens, K_FINGERPRINT))) { - /* If there's a fingerprint line, it must match the identity digest. */ - char d[DIGEST_LEN]; - tor_assert(tok->n_args == 1); - tor_strstrip(tok->args[0], " "); - if (base16_decode(d, DIGEST_LEN, - tok->args[0], strlen(tok->args[0])) != DIGEST_LEN) { - log_warn(LD_DIR, "Couldn't decode router fingerprint %s", - escaped(tok->args[0])); - goto err; - } - if (tor_memneq(d,router->cache_info.identity_digest, DIGEST_LEN)) { - log_warn(LD_DIR, "Fingerprint '%s' does not match identity digest.", - tok->args[0]); - goto err; - } - } - - if ((tok = find_opt_by_keyword(tokens, K_PLATFORM))) { - router->platform = tor_strdup(tok->args[0]); - } - - if ((tok = find_opt_by_keyword(tokens, K_PROTO))) { - router->protocol_list = tor_strdup(tok->args[0]); - } - - if ((tok = find_opt_by_keyword(tokens, K_CONTACT))) { - router->contact_info = tor_strdup(tok->args[0]); - } - - if (find_opt_by_keyword(tokens, K_REJECT6) || - find_opt_by_keyword(tokens, K_ACCEPT6)) { - log_warn(LD_DIR, "Rejecting router with reject6/accept6 line: they crash " - "older Tors."); - goto err; - } - { - smartlist_t *or_addresses = find_all_by_keyword(tokens, K_OR_ADDRESS); - if (or_addresses) { - find_single_ipv6_orport(or_addresses, &router->ipv6_addr, - &router->ipv6_orport); - smartlist_free(or_addresses); - } - } - exit_policy_tokens = find_all_exitpolicy(tokens); - if (!smartlist_len(exit_policy_tokens)) { - log_warn(LD_DIR, "No exit policy tokens in descriptor."); - goto err; - } - SMARTLIST_FOREACH(exit_policy_tokens, directory_token_t *, t, - if (router_add_exit_policy(router,t)<0) { - log_warn(LD_DIR,"Error in exit policy"); - goto err; - }); - policy_expand_private(&router->exit_policy); - - if ((tok = find_opt_by_keyword(tokens, K_IPV6_POLICY)) && tok->n_args) { - router->ipv6_exit_policy = parse_short_policy(tok->args[0]); - if (! router->ipv6_exit_policy) { - log_warn(LD_DIR , "Error in ipv6-policy %s", escaped(tok->args[0])); - goto err; - } - } - - if (policy_is_reject_star(router->exit_policy, AF_INET, 1) && - (!router->ipv6_exit_policy || - short_policy_is_reject_star(router->ipv6_exit_policy))) - router->policy_is_reject_star = 1; - - if ((tok = find_opt_by_keyword(tokens, K_FAMILY)) && tok->n_args) { - int i; - router->declared_family = smartlist_new(); - for (i=0;i<tok->n_args;++i) { - if (!is_legal_nickname_or_hexdigest(tok->args[i])) { - log_warn(LD_DIR, "Illegal nickname %s in family line", - escaped(tok->args[i])); - goto err; - } - smartlist_add(router->declared_family, tor_strdup(tok->args[i])); - } - } - - if (find_opt_by_keyword(tokens, K_CACHES_EXTRA_INFO)) - router->caches_extra_info = 1; - - if (find_opt_by_keyword(tokens, K_ALLOW_SINGLE_HOP_EXITS)) - router->allow_single_hop_exits = 1; - - if ((tok = find_opt_by_keyword(tokens, K_EXTRA_INFO_DIGEST))) { - tor_assert(tok->n_args >= 1); - if (strlen(tok->args[0]) == HEX_DIGEST_LEN) { - if (base16_decode(router->cache_info.extra_info_digest, DIGEST_LEN, - tok->args[0], HEX_DIGEST_LEN) != DIGEST_LEN) { - log_warn(LD_DIR,"Invalid extra info digest"); - } - } else { - log_warn(LD_DIR, "Invalid extra info digest %s", escaped(tok->args[0])); - } - - if (tok->n_args >= 2) { - if (digest256_from_base64(router->cache_info.extra_info_digest256, - tok->args[1]) < 0) { - log_warn(LD_DIR, "Invalid extra info digest256 %s", - escaped(tok->args[1])); - } - } - } - - if (find_opt_by_keyword(tokens, K_HIDDEN_SERVICE_DIR)) { - router->wants_to_be_hs_dir = 1; - } - - /* This router accepts tunnelled directory requests via begindir if it has - * an open dirport or it included "tunnelled-dir-server". */ - if (find_opt_by_keyword(tokens, K_DIR_TUNNELLED) || router->dir_port > 0) { - router->supports_tunnelled_dir_requests = 1; - } - - tok = find_by_keyword(tokens, K_ROUTER_SIGNATURE); - note_crypto_pk_op(VERIFY_RTR); -#ifdef COUNT_DISTINCT_DIGESTS - if (!verified_digests) - verified_digests = digestmap_new(); - digestmap_set(verified_digests, signed_digest, (void*)(uintptr_t)1); -#endif - - if (!router->or_port) { - log_warn(LD_DIR,"or_port unreadable or 0. Failing."); - goto err; - } - - /* We've checked everything that's covered by the hash. */ - can_dl_again = 1; - if (check_signature_token(digest, DIGEST_LEN, tok, router->identity_pkey, 0, - "router descriptor") < 0) - goto err; - - if (!router->platform) { - router->platform = tor_strdup("<unknown>"); - } - goto done; - - err: - dump_desc(s_dup, "router descriptor"); - routerinfo_free(router); - router = NULL; - done: - tor_cert_free(ntor_cc_cert); - if (tokens) { - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - } - smartlist_free(exit_policy_tokens); - if (area) { - DUMP_AREA(area, "routerinfo"); - memarea_drop_all(area); - } - if (can_dl_again_out) - *can_dl_again_out = can_dl_again; - return router; -} - -/** Parse a single extrainfo entry from the string <b>s</b>, ending at - * <b>end</b>. (If <b>end</b> is NULL, parse up to the end of <b>s</b>.) If - * <b>cache_copy</b> is true, make a copy of the extra-info document in the - * cache_info fields of the result. If <b>routermap</b> is provided, use it - * as a map from router identity to routerinfo_t when looking up signing keys. - * - * If <b>can_dl_again_out</b> is provided, set *<b>can_dl_again_out</b> to 1 - * if it's okay to try to download an extrainfo with this same digest again, - * and 0 if it isn't. (It might not be okay to download it again if part of - * the part covered by the digest is invalid.) - */ -extrainfo_t * -extrainfo_parse_entry_from_string(const char *s, const char *end, - int cache_copy, struct digest_ri_map_t *routermap, - int *can_dl_again_out) -{ - extrainfo_t *extrainfo = NULL; - char digest[128]; - smartlist_t *tokens = NULL; - directory_token_t *tok; - crypto_pk_t *key = NULL; - routerinfo_t *router = NULL; - memarea_t *area = NULL; - const char *s_dup = s; - /* Do not set this to '1' until we have parsed everything that we intend to - * parse that's covered by the hash. */ - int can_dl_again = 0; - - if (!end) { - end = s + strlen(s); - } - - /* point 'end' to a point immediately after the final newline. */ - while (end > s+2 && *(end-1) == '\n' && *(end-2) == '\n') - --end; - - if (router_get_extrainfo_hash(s, end-s, digest) < 0) { - log_warn(LD_DIR, "Couldn't compute router hash."); - goto err; - } - tokens = smartlist_new(); - area = memarea_new(); - if (tokenize_string(area,s,end,tokens,extrainfo_token_table,0)) { - log_warn(LD_DIR, "Error tokenizing extra-info document."); - goto err; - } - - if (smartlist_len(tokens) < 2) { - log_warn(LD_DIR, "Impossibly short extra-info document."); - goto err; - } - - /* XXXX Accept this in position 1 too, and ed identity in position 0. */ - tok = smartlist_get(tokens,0); - if (tok->tp != K_EXTRA_INFO) { - log_warn(LD_DIR,"Entry does not start with \"extra-info\""); - goto err; - } - - extrainfo = tor_malloc_zero(sizeof(extrainfo_t)); - extrainfo->cache_info.is_extrainfo = 1; - if (cache_copy) - extrainfo->cache_info.signed_descriptor_body = tor_memdup_nulterm(s,end-s); - extrainfo->cache_info.signed_descriptor_len = end-s; - memcpy(extrainfo->cache_info.signed_descriptor_digest, digest, DIGEST_LEN); - crypto_digest256((char*)extrainfo->digest256, s, end-s, DIGEST_SHA256); - - tor_assert(tok->n_args >= 2); - if (!is_legal_nickname(tok->args[0])) { - log_warn(LD_DIR,"Bad nickname %s on \"extra-info\"",escaped(tok->args[0])); - goto err; - } - strlcpy(extrainfo->nickname, tok->args[0], sizeof(extrainfo->nickname)); - if (strlen(tok->args[1]) != HEX_DIGEST_LEN || - base16_decode(extrainfo->cache_info.identity_digest, DIGEST_LEN, - tok->args[1], HEX_DIGEST_LEN) != DIGEST_LEN) { - log_warn(LD_DIR,"Invalid fingerprint %s on \"extra-info\"", - escaped(tok->args[1])); - goto err; - } - - tok = find_by_keyword(tokens, K_PUBLISHED); - if (parse_iso_time(tok->args[0], &extrainfo->cache_info.published_on)) { - log_warn(LD_DIR,"Invalid published time %s on \"extra-info\"", - escaped(tok->args[0])); - goto err; - } - - { - directory_token_t *ed_sig_tok, *ed_cert_tok; - ed_sig_tok = find_opt_by_keyword(tokens, K_ROUTER_SIG_ED25519); - ed_cert_tok = find_opt_by_keyword(tokens, K_IDENTITY_ED25519); - int n_ed_toks = !!ed_sig_tok + !!ed_cert_tok; - if (n_ed_toks != 0 && n_ed_toks != 2) { - log_warn(LD_DIR, "Router descriptor with only partial ed25519/" - "cross-certification support"); - goto err; - } - if (ed_sig_tok) { - tor_assert(ed_cert_tok); - const int ed_cert_token_pos = smartlist_pos(tokens, ed_cert_tok); - if (ed_cert_token_pos != 1) { - /* Accept this in position 0 XXXX */ - log_warn(LD_DIR, "Ed25519 certificate in wrong position"); - goto err; - } - if (ed_sig_tok != smartlist_get(tokens, smartlist_len(tokens)-2)) { - log_warn(LD_DIR, "Ed25519 signature in wrong position"); - goto err; - } - if (strcmp(ed_cert_tok->object_type, "ED25519 CERT")) { - log_warn(LD_DIR, "Wrong object type on identity-ed25519 in decriptor"); - goto err; - } - - uint8_t d256[DIGEST256_LEN]; - const char *signed_start, *signed_end; - tor_cert_t *cert = tor_cert_parse( - (const uint8_t*)ed_cert_tok->object_body, - ed_cert_tok->object_size); - if (! cert) { - log_warn(LD_DIR, "Couldn't parse ed25519 cert"); - goto err; - } - /* makes sure it gets freed. */ - extrainfo->cache_info.signing_key_cert = cert; - - if (cert->cert_type != CERT_TYPE_ID_SIGNING || - ! cert->signing_key_included) { - log_warn(LD_DIR, "Invalid form for ed25519 cert"); - goto err; - } - - if (router_get_hash_impl_helper(s, end-s, "extra-info ", - "\nrouter-sig-ed25519", - ' ', &signed_start, &signed_end) < 0) { - log_warn(LD_DIR, "Can't find ed25519-signed portion of extrainfo"); - goto err; - } - crypto_digest_t *d = crypto_digest256_new(DIGEST_SHA256); - crypto_digest_add_bytes(d, ED_DESC_SIGNATURE_PREFIX, - strlen(ED_DESC_SIGNATURE_PREFIX)); - crypto_digest_add_bytes(d, signed_start, signed_end-signed_start); - crypto_digest_get_digest(d, (char*)d256, sizeof(d256)); - crypto_digest_free(d); - - ed25519_checkable_t check[2]; - int check_ok[2]; - if (tor_cert_get_checkable_sig(&check[0], cert, NULL) < 0) { - log_err(LD_BUG, "Couldn't create 'checkable' for cert."); - goto err; - } - - if (ed25519_signature_from_base64(&check[1].signature, - ed_sig_tok->args[0])<0) { - log_warn(LD_DIR, "Couldn't decode ed25519 signature"); - goto err; - } - check[1].pubkey = &cert->signed_key; - check[1].msg = d256; - check[1].len = DIGEST256_LEN; - - if (ed25519_checksig_batch(check_ok, check, 2) < 0) { - log_warn(LD_DIR, "Incorrect ed25519 signature(s)"); - goto err; - } - /* We don't check the certificate expiration time: checking that it - * matches the cert in the router descriptor is adequate. */ - } - } - - /* We've checked everything that's covered by the hash. */ - can_dl_again = 1; - - if (routermap && - (router = digestmap_get((digestmap_t*)routermap, - extrainfo->cache_info.identity_digest))) { - key = router->identity_pkey; - } - - tok = find_by_keyword(tokens, K_ROUTER_SIGNATURE); - if (strcmp(tok->object_type, "SIGNATURE") || - tok->object_size < 128 || tok->object_size > 512) { - log_warn(LD_DIR, "Bad object type or length on extra-info signature"); - goto err; - } - - if (key) { - note_crypto_pk_op(VERIFY_RTR); - if (check_signature_token(digest, DIGEST_LEN, tok, key, 0, - "extra-info") < 0) - goto err; - - if (router) - extrainfo->cache_info.send_unencrypted = - router->cache_info.send_unencrypted; - } else { - extrainfo->pending_sig = tor_memdup(tok->object_body, - tok->object_size); - extrainfo->pending_sig_len = tok->object_size; - } - - goto done; - err: - dump_desc(s_dup, "extra-info descriptor"); - extrainfo_free(extrainfo); - extrainfo = NULL; - done: - if (tokens) { - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - } - if (area) { - DUMP_AREA(area, "extrainfo"); - memarea_drop_all(area); - } - if (can_dl_again_out) - *can_dl_again_out = can_dl_again; - return extrainfo; -} - -/** Parse a key certificate from <b>s</b>; point <b>end-of-string</b> to - * the first character after the certificate. */ -authority_cert_t * -authority_cert_parse_from_string(const char *s, const char **end_of_string) -{ - /** Reject any certificate at least this big; it is probably an overflow, an - * attack, a bug, or some other nonsense. */ -#define MAX_CERT_SIZE (128*1024) - - authority_cert_t *cert = NULL, *old_cert; - smartlist_t *tokens = NULL; - char digest[DIGEST_LEN]; - directory_token_t *tok; - char fp_declared[DIGEST_LEN]; - char *eos; - size_t len; - int found; - memarea_t *area = NULL; - const char *s_dup = s; - - s = eat_whitespace(s); - eos = strstr(s, "\ndir-key-certification"); - if (! eos) { - log_warn(LD_DIR, "No signature found on key certificate"); - return NULL; - } - eos = strstr(eos, "\n-----END SIGNATURE-----\n"); - if (! eos) { - log_warn(LD_DIR, "No end-of-signature found on key certificate"); - return NULL; - } - eos = strchr(eos+2, '\n'); - tor_assert(eos); - ++eos; - len = eos - s; - - if (len > MAX_CERT_SIZE) { - log_warn(LD_DIR, "Certificate is far too big (at %lu bytes long); " - "rejecting", (unsigned long)len); - return NULL; - } - - tokens = smartlist_new(); - area = memarea_new(); - if (tokenize_string(area,s, eos, tokens, dir_key_certificate_table, 0) < 0) { - log_warn(LD_DIR, "Error tokenizing key certificate"); - goto err; - } - if (router_get_hash_impl(s, strlen(s), digest, "dir-key-certificate-version", - "\ndir-key-certification", '\n', DIGEST_SHA1) < 0) - goto err; - tok = smartlist_get(tokens, 0); - if (tok->tp != K_DIR_KEY_CERTIFICATE_VERSION || strcmp(tok->args[0], "3")) { - log_warn(LD_DIR, - "Key certificate does not begin with a recognized version (3)."); - goto err; - } - - cert = tor_malloc_zero(sizeof(authority_cert_t)); - memcpy(cert->cache_info.signed_descriptor_digest, digest, DIGEST_LEN); - - tok = find_by_keyword(tokens, K_DIR_SIGNING_KEY); - tor_assert(tok->key); - cert->signing_key = tok->key; - tok->key = NULL; - if (crypto_pk_get_digest(cert->signing_key, cert->signing_key_digest)) - goto err; - - tok = find_by_keyword(tokens, K_DIR_IDENTITY_KEY); - tor_assert(tok->key); - cert->identity_key = tok->key; - tok->key = NULL; - - tok = find_by_keyword(tokens, K_FINGERPRINT); - tor_assert(tok->n_args); - if (base16_decode(fp_declared, DIGEST_LEN, tok->args[0], - strlen(tok->args[0])) != DIGEST_LEN) { - log_warn(LD_DIR, "Couldn't decode key certificate fingerprint %s", - escaped(tok->args[0])); - goto err; - } - - if (crypto_pk_get_digest(cert->identity_key, - cert->cache_info.identity_digest)) - goto err; - - if (tor_memneq(cert->cache_info.identity_digest, fp_declared, DIGEST_LEN)) { - log_warn(LD_DIR, "Digest of certificate key didn't match declared " - "fingerprint"); - goto err; - } - - tok = find_opt_by_keyword(tokens, K_DIR_ADDRESS); - if (tok) { - struct in_addr in; - char *address = NULL; - tor_assert(tok->n_args); - /* XXX++ use some tor_addr parse function below instead. -RD */ - if (tor_addr_port_split(LOG_WARN, tok->args[0], &address, - &cert->dir_port) < 0 || - tor_inet_aton(address, &in) == 0) { - log_warn(LD_DIR, "Couldn't parse dir-address in certificate"); - tor_free(address); - goto err; - } - cert->addr = ntohl(in.s_addr); - tor_free(address); - } - - tok = find_by_keyword(tokens, K_DIR_KEY_PUBLISHED); - if (parse_iso_time(tok->args[0], &cert->cache_info.published_on) < 0) { - goto err; - } - tok = find_by_keyword(tokens, K_DIR_KEY_EXPIRES); - if (parse_iso_time(tok->args[0], &cert->expires) < 0) { - goto err; - } - - tok = smartlist_get(tokens, smartlist_len(tokens)-1); - if (tok->tp != K_DIR_KEY_CERTIFICATION) { - log_warn(LD_DIR, "Certificate didn't end with dir-key-certification."); - goto err; - } - - /* If we already have this cert, don't bother checking the signature. */ - old_cert = authority_cert_get_by_digests( - cert->cache_info.identity_digest, - cert->signing_key_digest); - found = 0; - if (old_cert) { - /* XXXX We could just compare signed_descriptor_digest, but that wouldn't - * buy us much. */ - if (old_cert->cache_info.signed_descriptor_len == len && - old_cert->cache_info.signed_descriptor_body && - tor_memeq(s, old_cert->cache_info.signed_descriptor_body, len)) { - log_debug(LD_DIR, "We already checked the signature on this " - "certificate; no need to do so again."); - found = 1; - } - } - if (!found) { - if (check_signature_token(digest, DIGEST_LEN, tok, cert->identity_key, 0, - "key certificate")) { - goto err; - } - - tok = find_by_keyword(tokens, K_DIR_KEY_CROSSCERT); - if (check_signature_token(cert->cache_info.identity_digest, - DIGEST_LEN, - tok, - cert->signing_key, - CST_NO_CHECK_OBJTYPE, - "key cross-certification")) { - goto err; - } - } - - cert->cache_info.signed_descriptor_len = len; - cert->cache_info.signed_descriptor_body = tor_malloc(len+1); - memcpy(cert->cache_info.signed_descriptor_body, s, len); - cert->cache_info.signed_descriptor_body[len] = 0; - cert->cache_info.saved_location = SAVED_NOWHERE; - - if (end_of_string) { - *end_of_string = eat_whitespace(eos); - } - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - if (area) { - DUMP_AREA(area, "authority cert"); - memarea_drop_all(area); - } - return cert; - err: - dump_desc(s_dup, "authority cert"); - authority_cert_free(cert); - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - if (area) { - DUMP_AREA(area, "authority cert"); - memarea_drop_all(area); - } - return NULL; -} - -/** Helper: given a string <b>s</b>, return the start of the next router-status - * object (starting with "r " at the start of a line). If none is found, - * return the start of the directory footer, or the next directory signature. - * If none is found, return the end of the string. */ -static inline const char * -find_start_of_next_routerstatus(const char *s) -{ - const char *eos, *footer, *sig; - if ((eos = strstr(s, "\nr "))) - ++eos; - else - eos = s + strlen(s); - - footer = tor_memstr(s, eos-s, "\ndirectory-footer"); - sig = tor_memstr(s, eos-s, "\ndirectory-signature"); - - if (footer && sig) - return MIN(footer, sig) + 1; - else if (footer) - return footer+1; - else if (sig) - return sig+1; - else - return eos; -} - -/** Parse the GuardFraction string from a consensus or vote. - * - * If <b>vote</b> or <b>vote_rs</b> are set the document getting - * parsed is a vote routerstatus. Otherwise it's a consensus. This is - * the same semantic as in routerstatus_parse_entry_from_string(). */ -STATIC int -routerstatus_parse_guardfraction(const char *guardfraction_str, - networkstatus_t *vote, - vote_routerstatus_t *vote_rs, - routerstatus_t *rs) -{ - int ok; - const char *end_of_header = NULL; - int is_consensus = !vote_rs; - uint32_t guardfraction; - - tor_assert(bool_eq(vote, vote_rs)); - - /* If this info comes from a consensus, but we should't apply - guardfraction, just exit. */ - if (is_consensus && !should_apply_guardfraction(NULL)) { - return 0; - } - - end_of_header = strchr(guardfraction_str, '='); - if (!end_of_header) { - return -1; - } - - guardfraction = (uint32_t)tor_parse_ulong(end_of_header+1, - 10, 0, 100, &ok, NULL); - if (!ok) { - log_warn(LD_DIR, "Invalid GuardFraction %s", escaped(guardfraction_str)); - return -1; - } - - log_debug(LD_GENERAL, "[*] Parsed %s guardfraction '%s' for '%s'.", - is_consensus ? "consensus" : "vote", - guardfraction_str, rs->nickname); - - if (!is_consensus) { /* We are parsing a vote */ - vote_rs->status.guardfraction_percentage = guardfraction; - vote_rs->status.has_guardfraction = 1; - } else { - /* We are parsing a consensus. Only apply guardfraction to guards. */ - if (rs->is_possible_guard) { - rs->guardfraction_percentage = guardfraction; - rs->has_guardfraction = 1; - } else { - log_warn(LD_BUG, "Got GuardFraction for non-guard %s. " - "This is not supposed to happen. Not applying. ", rs->nickname); - } - } - - return 0; -} - -/** Given a string at *<b>s</b>, containing a routerstatus object, and an - * empty smartlist at <b>tokens</b>, parse and return the first router status - * object in the string, and advance *<b>s</b> to just after the end of the - * router status. Return NULL and advance *<b>s</b> on error. - * - * If <b>vote</b> and <b>vote_rs</b> are provided, don't allocate a fresh - * routerstatus but use <b>vote_rs</b> instead. - * - * If <b>consensus_method</b> is nonzero, this routerstatus is part of a - * consensus, and we should parse it according to the method used to - * make that consensus. - * - * Parse according to the syntax used by the consensus flavor <b>flav</b>. - **/ -STATIC routerstatus_t * -routerstatus_parse_entry_from_string(memarea_t *area, - const char **s, smartlist_t *tokens, - networkstatus_t *vote, - vote_routerstatus_t *vote_rs, - int consensus_method, - consensus_flavor_t flav) -{ - const char *eos, *s_dup = *s; - routerstatus_t *rs = NULL; - directory_token_t *tok; - char timebuf[ISO_TIME_LEN+1]; - struct in_addr in; - int offset = 0; - tor_assert(tokens); - tor_assert(bool_eq(vote, vote_rs)); - - if (!consensus_method) - flav = FLAV_NS; - tor_assert(flav == FLAV_NS || flav == FLAV_MICRODESC); - - eos = find_start_of_next_routerstatus(*s); - - if (tokenize_string(area,*s, eos, tokens, rtrstatus_token_table,0)) { - log_warn(LD_DIR, "Error tokenizing router status"); - goto err; - } - if (smartlist_len(tokens) < 1) { - log_warn(LD_DIR, "Impossibly short router status"); - goto err; - } - tok = find_by_keyword(tokens, K_R); - tor_assert(tok->n_args >= 7); /* guaranteed by GE(7) in K_R setup */ - if (flav == FLAV_NS) { - if (tok->n_args < 8) { - log_warn(LD_DIR, "Too few arguments to r"); - goto err; - } - } else if (flav == FLAV_MICRODESC) { - offset = -1; /* There is no identity digest */ - } - - if (vote_rs) { - rs = &vote_rs->status; - } else { - rs = tor_malloc_zero(sizeof(routerstatus_t)); - } - - if (!is_legal_nickname(tok->args[0])) { - log_warn(LD_DIR, - "Invalid nickname %s in router status; skipping.", - escaped(tok->args[0])); - goto err; - } - strlcpy(rs->nickname, tok->args[0], sizeof(rs->nickname)); - - if (digest_from_base64(rs->identity_digest, tok->args[1])) { - log_warn(LD_DIR, "Error decoding identity digest %s", - escaped(tok->args[1])); - goto err; - } - - if (flav == FLAV_NS) { - if (digest_from_base64(rs->descriptor_digest, tok->args[2])) { - log_warn(LD_DIR, "Error decoding descriptor digest %s", - escaped(tok->args[2])); - goto err; - } - } - - if (tor_snprintf(timebuf, sizeof(timebuf), "%s %s", - tok->args[3+offset], tok->args[4+offset]) < 0 || - parse_iso_time(timebuf, &rs->published_on)<0) { - log_warn(LD_DIR, "Error parsing time '%s %s' [%d %d]", - tok->args[3+offset], tok->args[4+offset], - offset, (int)flav); - goto err; - } - - if (tor_inet_aton(tok->args[5+offset], &in) == 0) { - log_warn(LD_DIR, "Error parsing router address in network-status %s", - escaped(tok->args[5+offset])); - goto err; - } - rs->addr = ntohl(in.s_addr); - - rs->or_port = (uint16_t) tor_parse_long(tok->args[6+offset], - 10,0,65535,NULL,NULL); - rs->dir_port = (uint16_t) tor_parse_long(tok->args[7+offset], - 10,0,65535,NULL,NULL); - - { - smartlist_t *a_lines = find_all_by_keyword(tokens, K_A); - if (a_lines) { - find_single_ipv6_orport(a_lines, &rs->ipv6_addr, &rs->ipv6_orport); - smartlist_free(a_lines); - } - } - - tok = find_opt_by_keyword(tokens, K_S); - if (tok && vote) { - int i; - vote_rs->flags = 0; - for (i=0; i < tok->n_args; ++i) { - int p = smartlist_string_pos(vote->known_flags, tok->args[i]); - if (p >= 0) { - vote_rs->flags |= (U64_LITERAL(1)<<p); - } else { - log_warn(LD_DIR, "Flags line had a flag %s not listed in known_flags.", - escaped(tok->args[i])); - goto err; - } - } - } else if (tok) { - /* This is a consensus, not a vote. */ - int i; - for (i=0; i < tok->n_args; ++i) { - if (!strcmp(tok->args[i], "Exit")) - rs->is_exit = 1; - else if (!strcmp(tok->args[i], "Stable")) - rs->is_stable = 1; - else if (!strcmp(tok->args[i], "Fast")) - rs->is_fast = 1; - else if (!strcmp(tok->args[i], "Running")) - rs->is_flagged_running = 1; - else if (!strcmp(tok->args[i], "Named")) - rs->is_named = 1; - else if (!strcmp(tok->args[i], "Valid")) - rs->is_valid = 1; - else if (!strcmp(tok->args[i], "Guard")) - rs->is_possible_guard = 1; - else if (!strcmp(tok->args[i], "BadExit")) - rs->is_bad_exit = 1; - else if (!strcmp(tok->args[i], "Authority")) - rs->is_authority = 1; - else if (!strcmp(tok->args[i], "Unnamed") && - consensus_method >= 2) { - /* Unnamed is computed right by consensus method 2 and later. */ - rs->is_unnamed = 1; - } else if (!strcmp(tok->args[i], "HSDir")) { - rs->is_hs_dir = 1; - } else if (!strcmp(tok->args[i], "V2Dir")) { - rs->is_v2_dir = 1; - } - } - /* These are implied true by having been included in a consensus made - * with a given method */ - rs->is_flagged_running = 1; /* Starting with consensus method 4. */ - if (consensus_method >= MIN_METHOD_FOR_EXCLUDING_INVALID_NODES) - rs->is_valid = 1; - } - int found_protocol_list = 0; - if ((tok = find_opt_by_keyword(tokens, K_PROTO))) { - found_protocol_list = 1; - rs->protocols_known = 1; - rs->supports_extend2_cells = - protocol_list_supports_protocol(tok->args[0], PRT_RELAY, 2); - } - if ((tok = find_opt_by_keyword(tokens, K_V))) { - tor_assert(tok->n_args == 1); - if (!strcmpstart(tok->args[0], "Tor ") && !found_protocol_list) { - /* We only do version checks like this in the case where - * the version is a "Tor" version, and where there is no - * list of protocol versions that we should be looking at instead. */ - rs->supports_extend2_cells = - tor_version_as_new_as(tok->args[0], "0.2.4.8-alpha"); - rs->protocols_known = 1; - } - if (vote_rs) { - vote_rs->version = tor_strdup(tok->args[0]); - } - } - - /* handle weighting/bandwidth info */ - if ((tok = find_opt_by_keyword(tokens, K_W))) { - int i; - for (i=0; i < tok->n_args; ++i) { - if (!strcmpstart(tok->args[i], "Bandwidth=")) { - int ok; - rs->bandwidth_kb = - (uint32_t)tor_parse_ulong(strchr(tok->args[i], '=')+1, - 10, 0, UINT32_MAX, - &ok, NULL); - if (!ok) { - log_warn(LD_DIR, "Invalid Bandwidth %s", escaped(tok->args[i])); - goto err; - } - rs->has_bandwidth = 1; - } else if (!strcmpstart(tok->args[i], "Measured=") && vote_rs) { - int ok; - vote_rs->measured_bw_kb = - (uint32_t)tor_parse_ulong(strchr(tok->args[i], '=')+1, - 10, 0, UINT32_MAX, &ok, NULL); - if (!ok) { - log_warn(LD_DIR, "Invalid Measured Bandwidth %s", - escaped(tok->args[i])); - goto err; - } - vote_rs->has_measured_bw = 1; - vote->has_measured_bws = 1; - } else if (!strcmpstart(tok->args[i], "Unmeasured=1")) { - rs->bw_is_unmeasured = 1; - } else if (!strcmpstart(tok->args[i], "GuardFraction=")) { - if (routerstatus_parse_guardfraction(tok->args[i], - vote, vote_rs, rs) < 0) { - goto err; - } - } - } - } - - /* parse exit policy summaries */ - if ((tok = find_opt_by_keyword(tokens, K_P))) { - tor_assert(tok->n_args == 1); - if (strcmpstart(tok->args[0], "accept ") && - strcmpstart(tok->args[0], "reject ")) { - log_warn(LD_DIR, "Unknown exit policy summary type %s.", - escaped(tok->args[0])); - goto err; - } - /* XXX weasel: parse this into ports and represent them somehow smart, - * maybe not here but somewhere on if we need it for the client. - * we should still parse it here to check it's valid tho. - */ - rs->exitsummary = tor_strdup(tok->args[0]); - rs->has_exitsummary = 1; - } - - if (vote_rs) { - SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, t) { - if (t->tp == K_M && t->n_args) { - vote_microdesc_hash_t *line = - tor_malloc(sizeof(vote_microdesc_hash_t)); - line->next = vote_rs->microdesc; - line->microdesc_hash_line = tor_strdup(t->args[0]); - vote_rs->microdesc = line; - } - if (t->tp == K_ID) { - tor_assert(t->n_args >= 2); - if (!strcmp(t->args[0], "ed25519")) { - vote_rs->has_ed25519_listing = 1; - if (strcmp(t->args[1], "none") && - digest256_from_base64((char*)vote_rs->ed25519_id, - t->args[1])<0) { - log_warn(LD_DIR, "Bogus ed25519 key in networkstatus vote"); - goto err; - } - } - } - if (t->tp == K_PROTO) { - tor_assert(t->n_args == 1); - vote_rs->protocols = tor_strdup(t->args[0]); - } - } SMARTLIST_FOREACH_END(t); - } else if (flav == FLAV_MICRODESC) { - tok = find_opt_by_keyword(tokens, K_M); - if (tok) { - tor_assert(tok->n_args); - if (digest256_from_base64(rs->descriptor_digest, tok->args[0])) { - log_warn(LD_DIR, "Error decoding microdescriptor digest %s", - escaped(tok->args[0])); - goto err; - } - } else { - log_info(LD_BUG, "Found an entry in networkstatus with no " - "microdescriptor digest. (Router %s ($%s) at %s:%d.)", - rs->nickname, hex_str(rs->identity_digest, DIGEST_LEN), - fmt_addr32(rs->addr), rs->or_port); - } - } - - if (!strcasecmp(rs->nickname, UNNAMED_ROUTER_NICKNAME)) - rs->is_named = 0; - - goto done; - err: - dump_desc(s_dup, "routerstatus entry"); - if (rs && !vote_rs) - routerstatus_free(rs); - rs = NULL; - done: - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_clear(tokens); - if (area) { - DUMP_AREA(area, "routerstatus entry"); - memarea_clear(area); - } - *s = eos; - - return rs; -} - -int -compare_vote_routerstatus_entries(const void **_a, const void **_b) -{ - const vote_routerstatus_t *a = *_a, *b = *_b; - return fast_memcmp(a->status.identity_digest, b->status.identity_digest, - DIGEST_LEN); -} - -/** Verify the bandwidth weights of a network status document */ -int -networkstatus_verify_bw_weights(networkstatus_t *ns, int consensus_method) -{ - int64_t weight_scale; - int64_t G=0, M=0, E=0, D=0, T=0; - double Wgg, Wgm, Wgd, Wmg, Wmm, Wme, Wmd, Weg, Wem, Wee, Wed; - double Gtotal=0, Mtotal=0, Etotal=0; - const char *casename = NULL; - int valid = 1; - (void) consensus_method; - - weight_scale = networkstatus_get_weight_scale_param(ns); - Wgg = networkstatus_get_bw_weight(ns, "Wgg", -1); - Wgm = networkstatus_get_bw_weight(ns, "Wgm", -1); - Wgd = networkstatus_get_bw_weight(ns, "Wgd", -1); - Wmg = networkstatus_get_bw_weight(ns, "Wmg", -1); - Wmm = networkstatus_get_bw_weight(ns, "Wmm", -1); - Wme = networkstatus_get_bw_weight(ns, "Wme", -1); - Wmd = networkstatus_get_bw_weight(ns, "Wmd", -1); - Weg = networkstatus_get_bw_weight(ns, "Weg", -1); - Wem = networkstatus_get_bw_weight(ns, "Wem", -1); - Wee = networkstatus_get_bw_weight(ns, "Wee", -1); - Wed = networkstatus_get_bw_weight(ns, "Wed", -1); - - if (Wgg<0 || Wgm<0 || Wgd<0 || Wmg<0 || Wmm<0 || Wme<0 || Wmd<0 || Weg<0 - || Wem<0 || Wee<0 || Wed<0) { - log_warn(LD_BUG, "No bandwidth weights produced in consensus!"); - return 0; - } - - // First, sanity check basic summing properties that hold for all cases - // We use > 1 as the check for these because they are computed as integers. - // Sometimes there are rounding errors. - if (fabs(Wmm - weight_scale) > 1) { - log_warn(LD_BUG, "Wmm=%f != "I64_FORMAT, - Wmm, I64_PRINTF_ARG(weight_scale)); - valid = 0; - } - - if (fabs(Wem - Wee) > 1) { - log_warn(LD_BUG, "Wem=%f != Wee=%f", Wem, Wee); - valid = 0; - } - - if (fabs(Wgm - Wgg) > 1) { - log_warn(LD_BUG, "Wgm=%f != Wgg=%f", Wgm, Wgg); - valid = 0; - } - - if (fabs(Weg - Wed) > 1) { - log_warn(LD_BUG, "Wed=%f != Weg=%f", Wed, Weg); - valid = 0; - } - - if (fabs(Wgg + Wmg - weight_scale) > 0.001*weight_scale) { - log_warn(LD_BUG, "Wgg=%f != "I64_FORMAT" - Wmg=%f", Wgg, - I64_PRINTF_ARG(weight_scale), Wmg); - valid = 0; - } - - if (fabs(Wee + Wme - weight_scale) > 0.001*weight_scale) { - log_warn(LD_BUG, "Wee=%f != "I64_FORMAT" - Wme=%f", Wee, - I64_PRINTF_ARG(weight_scale), Wme); - valid = 0; - } - - if (fabs(Wgd + Wmd + Wed - weight_scale) > 0.001*weight_scale) { - log_warn(LD_BUG, "Wgd=%f + Wmd=%f + Wed=%f != "I64_FORMAT, - Wgd, Wmd, Wed, I64_PRINTF_ARG(weight_scale)); - valid = 0; - } - - Wgg /= weight_scale; - Wgm /= weight_scale; - Wgd /= weight_scale; - - Wmg /= weight_scale; - Wmm /= weight_scale; - Wme /= weight_scale; - Wmd /= weight_scale; - - Weg /= weight_scale; - Wem /= weight_scale; - Wee /= weight_scale; - Wed /= weight_scale; - - // Then, gather G, M, E, D, T to determine case - SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, routerstatus_t *, rs) { - int is_exit = 0; - /* Bug #2203: Don't count bad exits as exits for balancing */ - is_exit = rs->is_exit && !rs->is_bad_exit; - if (rs->has_bandwidth) { - T += rs->bandwidth_kb; - if (is_exit && rs->is_possible_guard) { - D += rs->bandwidth_kb; - Gtotal += Wgd*rs->bandwidth_kb; - Mtotal += Wmd*rs->bandwidth_kb; - Etotal += Wed*rs->bandwidth_kb; - } else if (is_exit) { - E += rs->bandwidth_kb; - Mtotal += Wme*rs->bandwidth_kb; - Etotal += Wee*rs->bandwidth_kb; - } else if (rs->is_possible_guard) { - G += rs->bandwidth_kb; - Gtotal += Wgg*rs->bandwidth_kb; - Mtotal += Wmg*rs->bandwidth_kb; - } else { - M += rs->bandwidth_kb; - Mtotal += Wmm*rs->bandwidth_kb; - } - } else { - log_warn(LD_BUG, "Missing consensus bandwidth for router %s", - routerstatus_describe(rs)); - } - } SMARTLIST_FOREACH_END(rs); - - // Finally, check equality conditions depending upon case 1, 2 or 3 - // Full equality cases: 1, 3b - // Partial equality cases: 2b (E=G), 3a (M=E) - // Fully unknown: 2a - if (3*E >= T && 3*G >= T) { - // Case 1: Neither are scarce - casename = "Case 1"; - if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Etotal, Mtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Etotal, Gtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Mtotal, Gtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - } else if (3*E < T && 3*G < T) { - int64_t R = MIN(E, G); - int64_t S = MAX(E, G); - /* - * Case 2: Both Guards and Exits are scarce - * Balance D between E and G, depending upon - * D capacity and scarcity. Devote no extra - * bandwidth to middle nodes. - */ - if (R+D < S) { // Subcase a - double Rtotal, Stotal; - if (E < G) { - Rtotal = Etotal; - Stotal = Gtotal; - } else { - Rtotal = Gtotal; - Stotal = Etotal; - } - casename = "Case 2a"; - // Rtotal < Stotal - if (Rtotal > Stotal) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Rtotal %f > Stotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Rtotal, Stotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - // Rtotal < T/3 - if (3*Rtotal > T) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: 3*Rtotal %f > T " - I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT - " D="I64_FORMAT" T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Rtotal*3, I64_PRINTF_ARG(T), - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - // Stotal < T/3 - if (3*Stotal > T) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: 3*Stotal %f > T " - I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT - " D="I64_FORMAT" T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Stotal*3, I64_PRINTF_ARG(T), - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - // Mtotal > T/3 - if (3*Mtotal < T) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: 3*Mtotal %f < T " - I64_FORMAT". " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Mtotal*3, I64_PRINTF_ARG(T), - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - } else { // Subcase b: R+D > S - casename = "Case 2b"; - - /* Check the rare-M redirect case. */ - if (D != 0 && 3*M < T) { - casename = "Case 2b (balanced)"; - if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Etotal, Mtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Etotal, Gtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Mtotal, Gtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - } else { - if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Etotal, Gtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - } - } - } else { // if (E < T/3 || G < T/3) { - int64_t S = MIN(E, G); - int64_t NS = MAX(E, G); - if (3*(S+D) < T) { // Subcase a: - double Stotal; - double NStotal; - if (G < E) { - casename = "Case 3a (G scarce)"; - Stotal = Gtotal; - NStotal = Etotal; - } else { // if (G >= E) { - casename = "Case 3a (E scarce)"; - NStotal = Gtotal; - Stotal = Etotal; - } - // Stotal < T/3 - if (3*Stotal > T) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: 3*Stotal %f > T " - I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT - " D="I64_FORMAT" T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Stotal*3, I64_PRINTF_ARG(T), - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - if (NS >= M) { - if (fabs(NStotal-Mtotal) > 0.01*MAX(NStotal,Mtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: NStotal %f != Mtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, NStotal, Mtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - } else { - // if NS < M, NStotal > T/3 because only one of G or E is scarce - if (3*NStotal < T) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: 3*NStotal %f < T " - I64_FORMAT". G="I64_FORMAT" M="I64_FORMAT - " E="I64_FORMAT" D="I64_FORMAT" T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, NStotal*3, I64_PRINTF_ARG(T), - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - } - } else { // Subcase b: S+D >= T/3 - casename = "Case 3b"; - if (fabs(Etotal-Mtotal) > 0.01*MAX(Etotal,Mtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Etotal %f != Mtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Etotal, Mtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - if (fabs(Etotal-Gtotal) > 0.01*MAX(Etotal,Gtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Etotal %f != Gtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Etotal, Gtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - if (fabs(Gtotal-Mtotal) > 0.01*MAX(Gtotal,Mtotal)) { - log_warn(LD_DIR, - "Bw Weight Failure for %s: Mtotal %f != Gtotal %f. " - "G="I64_FORMAT" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT - " T="I64_FORMAT". " - "Wgg=%f Wgd=%f Wmg=%f Wme=%f Wmd=%f Wee=%f Wed=%f", - casename, Mtotal, Gtotal, - I64_PRINTF_ARG(G), I64_PRINTF_ARG(M), I64_PRINTF_ARG(E), - I64_PRINTF_ARG(D), I64_PRINTF_ARG(T), - Wgg, Wgd, Wmg, Wme, Wmd, Wee, Wed); - valid = 0; - } - } - } - - if (valid) - log_notice(LD_DIR, "Bandwidth-weight %s is verified and valid.", - casename); - - return valid; -} - -/** Parse and extract all SR commits from <b>tokens</b> and place them in - * <b>ns</b>. */ -static void -extract_shared_random_commits(networkstatus_t *ns, smartlist_t *tokens) -{ - smartlist_t *chunks = NULL; - - tor_assert(ns); - tor_assert(tokens); - /* Commits are only present in a vote. */ - tor_assert(ns->type == NS_TYPE_VOTE); - - ns->sr_info.commits = smartlist_new(); - - smartlist_t *commits = find_all_by_keyword(tokens, K_COMMIT); - /* It's normal that a vote might contain no commits even if it participates - * in the SR protocol. Don't treat it as an error. */ - if (commits == NULL) { - goto end; - } - - /* Parse the commit. We do NO validation of number of arguments or ordering - * for forward compatibility, it's the parse commit job to inform us if it's - * supported or not. */ - chunks = smartlist_new(); - SMARTLIST_FOREACH_BEGIN(commits, directory_token_t *, tok) { - /* Extract all arguments and put them in the chunks list. */ - for (int i = 0; i < tok->n_args; i++) { - smartlist_add(chunks, tok->args[i]); - } - sr_commit_t *commit = sr_parse_commit(chunks); - smartlist_clear(chunks); - if (commit == NULL) { - /* Get voter identity so we can warn that this dirauth vote contains - * commit we can't parse. */ - networkstatus_voter_info_t *voter = smartlist_get(ns->voters, 0); - tor_assert(voter); - log_warn(LD_DIR, "SR: Unable to parse commit %s from vote of voter %s.", - escaped(tok->object_body), - hex_str(voter->identity_digest, - sizeof(voter->identity_digest))); - /* Commitment couldn't be parsed. Continue onto the next commit because - * this one could be unsupported for instance. */ - continue; - } - /* Add newly created commit object to the vote. */ - smartlist_add(ns->sr_info.commits, commit); - } SMARTLIST_FOREACH_END(tok); - - end: - smartlist_free(chunks); - smartlist_free(commits); -} - -/** Check if a shared random value of type <b>srv_type</b> is in - * <b>tokens</b>. If there is, parse it and set it to <b>srv_out</b>. Return - * -1 on failure, 0 on success. The resulting srv is allocated on the heap and - * it's the responsibility of the caller to free it. */ -static int -extract_one_srv(smartlist_t *tokens, directory_keyword srv_type, - sr_srv_t **srv_out) -{ - int ret = -1; - directory_token_t *tok; - sr_srv_t *srv = NULL; - smartlist_t *chunks; - - tor_assert(tokens); - - chunks = smartlist_new(); - tok = find_opt_by_keyword(tokens, srv_type); - if (!tok) { - /* That's fine, no SRV is allowed. */ - ret = 0; - goto end; - } - for (int i = 0; i < tok->n_args; i++) { - smartlist_add(chunks, tok->args[i]); - } - srv = sr_parse_srv(chunks); - if (srv == NULL) { - log_warn(LD_DIR, "SR: Unparseable SRV %s", escaped(tok->object_body)); - goto end; - } - /* All is good. */ - *srv_out = srv; - ret = 0; - end: - smartlist_free(chunks); - return ret; -} - -/** Extract any shared random values found in <b>tokens</b> and place them in - * the networkstatus <b>ns</b>. */ -static void -extract_shared_random_srvs(networkstatus_t *ns, smartlist_t *tokens) -{ - const char *voter_identity; - networkstatus_voter_info_t *voter; - - tor_assert(ns); - tor_assert(tokens); - /* Can be only one of them else code flow. */ - tor_assert(ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_CONSENSUS); - - if (ns->type == NS_TYPE_VOTE) { - voter = smartlist_get(ns->voters, 0); - tor_assert(voter); - voter_identity = hex_str(voter->identity_digest, - sizeof(voter->identity_digest)); - } else { - /* Consensus has multiple voters so no specific voter. */ - voter_identity = "consensus"; - } - - /* We extract both and on error, everything is stopped because it means - * the votes is malformed for the shared random value(s). */ - if (extract_one_srv(tokens, K_PREVIOUS_SRV, &ns->sr_info.previous_srv) < 0) { - log_warn(LD_DIR, "SR: Unable to parse previous SRV from %s", - voter_identity); - /* Maybe we have a chance with the current SRV so let's try it anyway. */ - } - if (extract_one_srv(tokens, K_CURRENT_SRV, &ns->sr_info.current_srv) < 0) { - log_warn(LD_DIR, "SR: Unable to parse current SRV from %s", - voter_identity); - } -} - -/** Parse a v3 networkstatus vote, opinion, or consensus (depending on - * ns_type), from <b>s</b>, and return the result. Return NULL on failure. */ -networkstatus_t * -networkstatus_parse_vote_from_string(const char *s, const char **eos_out, - networkstatus_type_t ns_type) -{ - smartlist_t *tokens = smartlist_new(); - smartlist_t *rs_tokens = NULL, *footer_tokens = NULL; - networkstatus_voter_info_t *voter = NULL; - networkstatus_t *ns = NULL; - common_digests_t ns_digests; - const char *cert, *end_of_header, *end_of_footer, *s_dup = s; - directory_token_t *tok; - struct in_addr in; - int i, inorder, n_signatures = 0; - memarea_t *area = NULL, *rs_area = NULL; - consensus_flavor_t flav = FLAV_NS; - char *last_kwd=NULL; - - tor_assert(s); - - if (eos_out) - *eos_out = NULL; - - if (router_get_networkstatus_v3_hashes(s, &ns_digests)) { - log_warn(LD_DIR, "Unable to compute digest of network-status"); - goto err; - } - - area = memarea_new(); - end_of_header = find_start_of_next_routerstatus(s); - if (tokenize_string(area, s, end_of_header, tokens, - (ns_type == NS_TYPE_CONSENSUS) ? - networkstatus_consensus_token_table : - networkstatus_token_table, 0)) { - log_warn(LD_DIR, "Error tokenizing network-status header"); - goto err; - } - - ns = tor_malloc_zero(sizeof(networkstatus_t)); - memcpy(&ns->digests, &ns_digests, sizeof(ns_digests)); - - tok = find_by_keyword(tokens, K_NETWORK_STATUS_VERSION); - tor_assert(tok); - if (tok->n_args > 1) { - int flavor = networkstatus_parse_flavor_name(tok->args[1]); - if (flavor < 0) { - log_warn(LD_DIR, "Can't parse document with unknown flavor %s", - escaped(tok->args[1])); - goto err; - } - ns->flavor = flav = flavor; - } - if (flav != FLAV_NS && ns_type != NS_TYPE_CONSENSUS) { - log_warn(LD_DIR, "Flavor found on non-consensus networkstatus."); - goto err; - } - - if (ns_type != NS_TYPE_CONSENSUS) { - const char *end_of_cert = NULL; - if (!(cert = strstr(s, "\ndir-key-certificate-version"))) - goto err; - ++cert; - ns->cert = authority_cert_parse_from_string(cert, &end_of_cert); - if (!ns->cert || !end_of_cert || end_of_cert > end_of_header) - goto err; - } - - tok = find_by_keyword(tokens, K_VOTE_STATUS); - tor_assert(tok->n_args); - if (!strcmp(tok->args[0], "vote")) { - ns->type = NS_TYPE_VOTE; - } else if (!strcmp(tok->args[0], "consensus")) { - ns->type = NS_TYPE_CONSENSUS; - } else if (!strcmp(tok->args[0], "opinion")) { - ns->type = NS_TYPE_OPINION; - } else { - log_warn(LD_DIR, "Unrecognized vote status %s in network-status", - escaped(tok->args[0])); - goto err; - } - if (ns_type != ns->type) { - log_warn(LD_DIR, "Got the wrong kind of v3 networkstatus."); - goto err; - } - - if (ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_OPINION) { - tok = find_by_keyword(tokens, K_PUBLISHED); - if (parse_iso_time(tok->args[0], &ns->published)) - goto err; - - ns->supported_methods = smartlist_new(); - tok = find_opt_by_keyword(tokens, K_CONSENSUS_METHODS); - if (tok) { - for (i=0; i < tok->n_args; ++i) - smartlist_add(ns->supported_methods, tor_strdup(tok->args[i])); - } else { - smartlist_add(ns->supported_methods, tor_strdup("1")); - } - } else { - tok = find_opt_by_keyword(tokens, K_CONSENSUS_METHOD); - if (tok) { - int num_ok; - ns->consensus_method = (int)tor_parse_long(tok->args[0], 10, 1, INT_MAX, - &num_ok, NULL); - if (!num_ok) - goto err; - } else { - ns->consensus_method = 1; - } - } - - if ((tok = find_opt_by_keyword(tokens, K_RECOMMENDED_CLIENT_PROTOCOLS))) - ns->recommended_client_protocols = tor_strdup(tok->args[0]); - if ((tok = find_opt_by_keyword(tokens, K_RECOMMENDED_RELAY_PROTOCOLS))) - ns->recommended_relay_protocols = tor_strdup(tok->args[0]); - if ((tok = find_opt_by_keyword(tokens, K_REQUIRED_CLIENT_PROTOCOLS))) - ns->required_client_protocols = tor_strdup(tok->args[0]); - if ((tok = find_opt_by_keyword(tokens, K_REQUIRED_RELAY_PROTOCOLS))) - ns->required_relay_protocols = tor_strdup(tok->args[0]); - - tok = find_by_keyword(tokens, K_VALID_AFTER); - if (parse_iso_time(tok->args[0], &ns->valid_after)) - goto err; - - tok = find_by_keyword(tokens, K_FRESH_UNTIL); - if (parse_iso_time(tok->args[0], &ns->fresh_until)) - goto err; - - tok = find_by_keyword(tokens, K_VALID_UNTIL); - if (parse_iso_time(tok->args[0], &ns->valid_until)) - goto err; - - tok = find_by_keyword(tokens, K_VOTING_DELAY); - tor_assert(tok->n_args >= 2); - { - int ok; - ns->vote_seconds = - (int) tor_parse_long(tok->args[0], 10, 0, INT_MAX, &ok, NULL); - if (!ok) - goto err; - ns->dist_seconds = - (int) tor_parse_long(tok->args[1], 10, 0, INT_MAX, &ok, NULL); - if (!ok) - goto err; - } - if (ns->valid_after + - (get_options()->TestingTorNetwork ? - MIN_VOTE_INTERVAL_TESTING : MIN_VOTE_INTERVAL) > ns->fresh_until) { - log_warn(LD_DIR, "Vote/consensus freshness interval is too short"); - goto err; - } - if (ns->valid_after + - (get_options()->TestingTorNetwork ? - MIN_VOTE_INTERVAL_TESTING : MIN_VOTE_INTERVAL)*2 > ns->valid_until) { - log_warn(LD_DIR, "Vote/consensus liveness interval is too short"); - goto err; - } - if (ns->vote_seconds < MIN_VOTE_SECONDS) { - log_warn(LD_DIR, "Vote seconds is too short"); - goto err; - } - if (ns->dist_seconds < MIN_DIST_SECONDS) { - log_warn(LD_DIR, "Dist seconds is too short"); - goto err; - } - - if ((tok = find_opt_by_keyword(tokens, K_CLIENT_VERSIONS))) { - ns->client_versions = tor_strdup(tok->args[0]); - } - if ((tok = find_opt_by_keyword(tokens, K_SERVER_VERSIONS))) { - ns->server_versions = tor_strdup(tok->args[0]); - } - - { - smartlist_t *package_lst = find_all_by_keyword(tokens, K_PACKAGE); - ns->package_lines = smartlist_new(); - if (package_lst) { - SMARTLIST_FOREACH(package_lst, directory_token_t *, t, - smartlist_add(ns->package_lines, tor_strdup(t->args[0]))); - } - smartlist_free(package_lst); - } - - tok = find_by_keyword(tokens, K_KNOWN_FLAGS); - ns->known_flags = smartlist_new(); - inorder = 1; - for (i = 0; i < tok->n_args; ++i) { - smartlist_add(ns->known_flags, tor_strdup(tok->args[i])); - if (i>0 && strcmp(tok->args[i-1], tok->args[i])>= 0) { - log_warn(LD_DIR, "%s >= %s", tok->args[i-1], tok->args[i]); - inorder = 0; - } - } - if (!inorder) { - log_warn(LD_DIR, "known-flags not in order"); - goto err; - } - if (ns->type != NS_TYPE_CONSENSUS && - smartlist_len(ns->known_flags) > MAX_KNOWN_FLAGS_IN_VOTE) { - /* If we allowed more than 64 flags in votes, then parsing them would make - * us invoke undefined behavior whenever we used 1<<flagnum to do a - * bit-shift. This is only for votes and opinions: consensus users don't - * care about flags they don't recognize, and so don't build a bitfield - * for them. */ - log_warn(LD_DIR, "Too many known-flags in consensus vote or opinion"); - goto err; - } - - tok = find_opt_by_keyword(tokens, K_PARAMS); - if (tok) { - int any_dups = 0; - inorder = 1; - ns->net_params = smartlist_new(); - for (i = 0; i < tok->n_args; ++i) { - int ok=0; - char *eq = strchr(tok->args[i], '='); - size_t eq_pos; - if (!eq) { - log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); - goto err; - } - eq_pos = eq-tok->args[i]; - tor_parse_long(eq+1, 10, INT32_MIN, INT32_MAX, &ok, NULL); - if (!ok) { - log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); - goto err; - } - if (i > 0 && strcmp(tok->args[i-1], tok->args[i]) >= 0) { - log_warn(LD_DIR, "%s >= %s", tok->args[i-1], tok->args[i]); - inorder = 0; - } - if (last_kwd && eq_pos == strlen(last_kwd) && - fast_memeq(last_kwd, tok->args[i], eq_pos)) { - log_warn(LD_DIR, "Duplicate value for %s parameter", - escaped(tok->args[i])); - any_dups = 1; - } - tor_free(last_kwd); - last_kwd = tor_strndup(tok->args[i], eq_pos); - smartlist_add(ns->net_params, tor_strdup(tok->args[i])); - } - if (!inorder) { - log_warn(LD_DIR, "params not in order"); - goto err; - } - if (any_dups) { - log_warn(LD_DIR, "Duplicate in parameters"); - goto err; - } - } - - ns->voters = smartlist_new(); - - SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, _tok) { - tok = _tok; - if (tok->tp == K_DIR_SOURCE) { - tor_assert(tok->n_args >= 6); - - if (voter) - smartlist_add(ns->voters, voter); - voter = tor_malloc_zero(sizeof(networkstatus_voter_info_t)); - voter->sigs = smartlist_new(); - if (ns->type != NS_TYPE_CONSENSUS) - memcpy(voter->vote_digest, ns_digests.d[DIGEST_SHA1], DIGEST_LEN); - - voter->nickname = tor_strdup(tok->args[0]); - if (strlen(tok->args[1]) != HEX_DIGEST_LEN || - base16_decode(voter->identity_digest, sizeof(voter->identity_digest), - tok->args[1], HEX_DIGEST_LEN) - != sizeof(voter->identity_digest)) { - log_warn(LD_DIR, "Error decoding identity digest %s in " - "network-status document.", escaped(tok->args[1])); - goto err; - } - if (ns->type != NS_TYPE_CONSENSUS && - tor_memneq(ns->cert->cache_info.identity_digest, - voter->identity_digest, DIGEST_LEN)) { - log_warn(LD_DIR,"Mismatch between identities in certificate and vote"); - goto err; - } - if (ns->type != NS_TYPE_CONSENSUS) { - if (authority_cert_is_blacklisted(ns->cert)) { - log_warn(LD_DIR, "Rejecting vote signature made with blacklisted " - "signing key %s", - hex_str(ns->cert->signing_key_digest, DIGEST_LEN)); - goto err; - } - } - voter->address = tor_strdup(tok->args[2]); - if (!tor_inet_aton(tok->args[3], &in)) { - log_warn(LD_DIR, "Error decoding IP address %s in network-status.", - escaped(tok->args[3])); - goto err; - } - voter->addr = ntohl(in.s_addr); - int ok; - voter->dir_port = (uint16_t) - tor_parse_long(tok->args[4], 10, 0, 65535, &ok, NULL); - if (!ok) - goto err; - voter->or_port = (uint16_t) - tor_parse_long(tok->args[5], 10, 0, 65535, &ok, NULL); - if (!ok) - goto err; - } else if (tok->tp == K_CONTACT) { - if (!voter || voter->contact) { - log_warn(LD_DIR, "contact element is out of place."); - goto err; - } - voter->contact = tor_strdup(tok->args[0]); - } else if (tok->tp == K_VOTE_DIGEST) { - tor_assert(ns->type == NS_TYPE_CONSENSUS); - tor_assert(tok->n_args >= 1); - if (!voter || ! tor_digest_is_zero(voter->vote_digest)) { - log_warn(LD_DIR, "vote-digest element is out of place."); - goto err; - } - if (strlen(tok->args[0]) != HEX_DIGEST_LEN || - base16_decode(voter->vote_digest, sizeof(voter->vote_digest), - tok->args[0], HEX_DIGEST_LEN) - != sizeof(voter->vote_digest)) { - log_warn(LD_DIR, "Error decoding vote digest %s in " - "network-status consensus.", escaped(tok->args[0])); - goto err; - } - } - } SMARTLIST_FOREACH_END(_tok); - if (voter) { - smartlist_add(ns->voters, voter); - voter = NULL; - } - if (smartlist_len(ns->voters) == 0) { - log_warn(LD_DIR, "Missing dir-source elements in a networkstatus."); - goto err; - } else if (ns->type != NS_TYPE_CONSENSUS && smartlist_len(ns->voters) != 1) { - log_warn(LD_DIR, "Too many dir-source elements in a vote networkstatus."); - goto err; - } - - if (ns->type != NS_TYPE_CONSENSUS && - (tok = find_opt_by_keyword(tokens, K_LEGACY_DIR_KEY))) { - int bad = 1; - if (strlen(tok->args[0]) == HEX_DIGEST_LEN) { - networkstatus_voter_info_t *voter_0 = smartlist_get(ns->voters, 0); - if (base16_decode(voter_0->legacy_id_digest, DIGEST_LEN, - tok->args[0], HEX_DIGEST_LEN) != DIGEST_LEN) - bad = 1; - else - bad = 0; - } - if (bad) { - log_warn(LD_DIR, "Invalid legacy key digest %s on vote.", - escaped(tok->args[0])); - } - } - - /* If this is a vote document, check if information about the shared - randomness protocol is included, and extract it. */ - if (ns->type == NS_TYPE_VOTE) { - /* Does this authority participates in the SR protocol? */ - tok = find_opt_by_keyword(tokens, K_SR_FLAG); - if (tok) { - ns->sr_info.participate = 1; - /* Get the SR commitments and reveals from the vote. */ - extract_shared_random_commits(ns, tokens); - } - } - /* For both a vote and consensus, extract the shared random values. */ - if (ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_CONSENSUS) { - extract_shared_random_srvs(ns, tokens); - } - - /* Parse routerstatus lines. */ - rs_tokens = smartlist_new(); - rs_area = memarea_new(); - s = end_of_header; - ns->routerstatus_list = smartlist_new(); - - while (!strcmpstart(s, "r ")) { - if (ns->type != NS_TYPE_CONSENSUS) { - vote_routerstatus_t *rs = tor_malloc_zero(sizeof(vote_routerstatus_t)); - if (routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, ns, - rs, 0, 0)) - smartlist_add(ns->routerstatus_list, rs); - else { - tor_free(rs->version); - tor_free(rs); - } - } else { - routerstatus_t *rs; - if ((rs = routerstatus_parse_entry_from_string(rs_area, &s, rs_tokens, - NULL, NULL, - ns->consensus_method, - flav))) { - /* Use exponential-backoff scheduling when downloading microdescs */ - rs->dl_status.backoff = DL_SCHED_RANDOM_EXPONENTIAL; - smartlist_add(ns->routerstatus_list, rs); - } - } - } - for (i = 1; i < smartlist_len(ns->routerstatus_list); ++i) { - routerstatus_t *rs1, *rs2; - if (ns->type != NS_TYPE_CONSENSUS) { - vote_routerstatus_t *a = smartlist_get(ns->routerstatus_list, i-1); - vote_routerstatus_t *b = smartlist_get(ns->routerstatus_list, i); - rs1 = &a->status; rs2 = &b->status; - } else { - rs1 = smartlist_get(ns->routerstatus_list, i-1); - rs2 = smartlist_get(ns->routerstatus_list, i); - } - if (fast_memcmp(rs1->identity_digest, rs2->identity_digest, DIGEST_LEN) - >= 0) { - log_warn(LD_DIR, "Networkstatus entries not sorted by identity digest"); - goto err; - } - } - if (ns_type != NS_TYPE_CONSENSUS) { - digest256map_t *ed_id_map = digest256map_new(); - SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, vote_routerstatus_t *, - vrs) { - if (! vrs->has_ed25519_listing || - tor_mem_is_zero((const char *)vrs->ed25519_id, DIGEST256_LEN)) - continue; - if (digest256map_get(ed_id_map, vrs->ed25519_id) != NULL) { - log_warn(LD_DIR, "Vote networkstatus ed25519 identities were not " - "unique"); - digest256map_free(ed_id_map, NULL); - goto err; - } - digest256map_set(ed_id_map, vrs->ed25519_id, (void*)1); - } SMARTLIST_FOREACH_END(vrs); - digest256map_free(ed_id_map, NULL); - } - - /* Parse footer; check signature. */ - footer_tokens = smartlist_new(); - if ((end_of_footer = strstr(s, "\nnetwork-status-version "))) - ++end_of_footer; - else - end_of_footer = s + strlen(s); - if (tokenize_string(area,s, end_of_footer, footer_tokens, - networkstatus_vote_footer_token_table, 0)) { - log_warn(LD_DIR, "Error tokenizing network-status vote footer."); - goto err; - } - - { - int found_sig = 0; - SMARTLIST_FOREACH_BEGIN(footer_tokens, directory_token_t *, _tok) { - tok = _tok; - if (tok->tp == K_DIRECTORY_SIGNATURE) - found_sig = 1; - else if (found_sig) { - log_warn(LD_DIR, "Extraneous token after first directory-signature"); - goto err; - } - } SMARTLIST_FOREACH_END(_tok); - } - - if ((tok = find_opt_by_keyword(footer_tokens, K_DIRECTORY_FOOTER))) { - if (tok != smartlist_get(footer_tokens, 0)) { - log_warn(LD_DIR, "Misplaced directory-footer token"); - goto err; - } - } - - tok = find_opt_by_keyword(footer_tokens, K_BW_WEIGHTS); - if (tok) { - ns->weight_params = smartlist_new(); - for (i = 0; i < tok->n_args; ++i) { - int ok=0; - char *eq = strchr(tok->args[i], '='); - if (!eq) { - log_warn(LD_DIR, "Bad element '%s' in weight params", - escaped(tok->args[i])); - goto err; - } - tor_parse_long(eq+1, 10, INT32_MIN, INT32_MAX, &ok, NULL); - if (!ok) { - log_warn(LD_DIR, "Bad element '%s' in params", escaped(tok->args[i])); - goto err; - } - smartlist_add(ns->weight_params, tor_strdup(tok->args[i])); - } - } - - SMARTLIST_FOREACH_BEGIN(footer_tokens, directory_token_t *, _tok) { - char declared_identity[DIGEST_LEN]; - networkstatus_voter_info_t *v; - document_signature_t *sig; - const char *id_hexdigest = NULL; - const char *sk_hexdigest = NULL; - digest_algorithm_t alg = DIGEST_SHA1; - tok = _tok; - if (tok->tp != K_DIRECTORY_SIGNATURE) - continue; - tor_assert(tok->n_args >= 2); - if (tok->n_args == 2) { - id_hexdigest = tok->args[0]; - sk_hexdigest = tok->args[1]; - } else { - const char *algname = tok->args[0]; - int a; - id_hexdigest = tok->args[1]; - sk_hexdigest = tok->args[2]; - a = crypto_digest_algorithm_parse_name(algname); - if (a<0) { - log_warn(LD_DIR, "Unknown digest algorithm %s; skipping", - escaped(algname)); - continue; - } - alg = a; - } - - if (!tok->object_type || - strcmp(tok->object_type, "SIGNATURE") || - tok->object_size < 128 || tok->object_size > 512) { - log_warn(LD_DIR, "Bad object type or length on directory-signature"); - goto err; - } - - if (strlen(id_hexdigest) != HEX_DIGEST_LEN || - base16_decode(declared_identity, sizeof(declared_identity), - id_hexdigest, HEX_DIGEST_LEN) - != sizeof(declared_identity)) { - log_warn(LD_DIR, "Error decoding declared identity %s in " - "network-status document.", escaped(id_hexdigest)); - goto err; - } - if (!(v = networkstatus_get_voter_by_id(ns, declared_identity))) { - log_warn(LD_DIR, "ID on signature on network-status document does " - "not match any declared directory source."); - goto err; - } - sig = tor_malloc_zero(sizeof(document_signature_t)); - memcpy(sig->identity_digest, v->identity_digest, DIGEST_LEN); - sig->alg = alg; - if (strlen(sk_hexdigest) != HEX_DIGEST_LEN || - base16_decode(sig->signing_key_digest, sizeof(sig->signing_key_digest), - sk_hexdigest, HEX_DIGEST_LEN) - != sizeof(sig->signing_key_digest)) { - log_warn(LD_DIR, "Error decoding declared signing key digest %s in " - "network-status document.", escaped(sk_hexdigest)); - tor_free(sig); - goto err; - } - - if (ns->type != NS_TYPE_CONSENSUS) { - if (tor_memneq(declared_identity, ns->cert->cache_info.identity_digest, - DIGEST_LEN)) { - log_warn(LD_DIR, "Digest mismatch between declared and actual on " - "network-status vote."); - tor_free(sig); - goto err; - } - } - - if (voter_get_sig_by_algorithm(v, sig->alg)) { - /* We already parsed a vote with this algorithm from this voter. Use the - first one. */ - log_fn(LOG_PROTOCOL_WARN, LD_DIR, "We received a networkstatus " - "that contains two signatures from the same voter with the same " - "algorithm. Ignoring the second signature."); - tor_free(sig); - continue; - } - - if (ns->type != NS_TYPE_CONSENSUS) { - if (check_signature_token(ns_digests.d[DIGEST_SHA1], DIGEST_LEN, - tok, ns->cert->signing_key, 0, - "network-status document")) { - tor_free(sig); - goto err; - } - sig->good_signature = 1; - } else { - if (tok->object_size >= INT_MAX || tok->object_size >= SIZE_T_CEILING) { - tor_free(sig); - goto err; - } - sig->signature = tor_memdup(tok->object_body, tok->object_size); - sig->signature_len = (int) tok->object_size; - } - smartlist_add(v->sigs, sig); - - ++n_signatures; - } SMARTLIST_FOREACH_END(_tok); - - if (! n_signatures) { - log_warn(LD_DIR, "No signatures on networkstatus document."); - goto err; - } else if (ns->type == NS_TYPE_VOTE && n_signatures != 1) { - log_warn(LD_DIR, "Received more than one signature on a " - "network-status vote."); - goto err; - } - - if (eos_out) - *eos_out = end_of_footer; - - goto done; - err: - dump_desc(s_dup, "v3 networkstatus"); - networkstatus_vote_free(ns); - ns = NULL; - done: - if (tokens) { - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - } - if (voter) { - if (voter->sigs) { - SMARTLIST_FOREACH(voter->sigs, document_signature_t *, sig, - document_signature_free(sig)); - smartlist_free(voter->sigs); - } - tor_free(voter->nickname); - tor_free(voter->address); - tor_free(voter->contact); - tor_free(voter); - } - if (rs_tokens) { - SMARTLIST_FOREACH(rs_tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(rs_tokens); - } - if (footer_tokens) { - SMARTLIST_FOREACH(footer_tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(footer_tokens); - } - if (area) { - DUMP_AREA(area, "v3 networkstatus"); - memarea_drop_all(area); - } - if (rs_area) - memarea_drop_all(rs_area); - tor_free(last_kwd); - - return ns; -} - -/** Return the common_digests_t that holds the digests of the - * <b>flavor_name</b>-flavored networkstatus according to the detached - * signatures document <b>sigs</b>, allocating a new common_digests_t as - * neeeded. */ -static common_digests_t * -detached_get_digests(ns_detached_signatures_t *sigs, const char *flavor_name) -{ - common_digests_t *d = strmap_get(sigs->digests, flavor_name); - if (!d) { - d = tor_malloc_zero(sizeof(common_digests_t)); - strmap_set(sigs->digests, flavor_name, d); - } - return d; -} - -/** Return the list of signatures of the <b>flavor_name</b>-flavored - * networkstatus according to the detached signatures document <b>sigs</b>, - * allocating a new common_digests_t as neeeded. */ -static smartlist_t * -detached_get_signatures(ns_detached_signatures_t *sigs, - const char *flavor_name) -{ - smartlist_t *sl = strmap_get(sigs->signatures, flavor_name); - if (!sl) { - sl = smartlist_new(); - strmap_set(sigs->signatures, flavor_name, sl); - } - return sl; -} - -/** Parse a detached v3 networkstatus signature document between <b>s</b> and - * <b>eos</b> and return the result. Return -1 on failure. */ -ns_detached_signatures_t * -networkstatus_parse_detached_signatures(const char *s, const char *eos) -{ - /* XXXX there is too much duplicate shared between this function and - * networkstatus_parse_vote_from_string(). */ - directory_token_t *tok; - memarea_t *area = NULL; - common_digests_t *digests; - - smartlist_t *tokens = smartlist_new(); - ns_detached_signatures_t *sigs = - tor_malloc_zero(sizeof(ns_detached_signatures_t)); - sigs->digests = strmap_new(); - sigs->signatures = strmap_new(); - - if (!eos) - eos = s + strlen(s); - - area = memarea_new(); - if (tokenize_string(area,s, eos, tokens, - networkstatus_detached_signature_token_table, 0)) { - log_warn(LD_DIR, "Error tokenizing detached networkstatus signatures"); - goto err; - } - - /* Grab all the digest-like tokens. */ - SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, _tok) { - const char *algname; - digest_algorithm_t alg; - const char *flavor; - const char *hexdigest; - size_t expected_length, digest_length; - - tok = _tok; - - if (tok->tp == K_CONSENSUS_DIGEST) { - algname = "sha1"; - alg = DIGEST_SHA1; - flavor = "ns"; - hexdigest = tok->args[0]; - } else if (tok->tp == K_ADDITIONAL_DIGEST) { - int a = crypto_digest_algorithm_parse_name(tok->args[1]); - if (a<0) { - log_warn(LD_DIR, "Unrecognized algorithm name %s", tok->args[0]); - continue; - } - alg = (digest_algorithm_t) a; - flavor = tok->args[0]; - algname = tok->args[1]; - hexdigest = tok->args[2]; - } else { - continue; - } - - digest_length = crypto_digest_algorithm_get_length(alg); - expected_length = digest_length * 2; /* hex encoding */ - - if (strlen(hexdigest) != expected_length) { - log_warn(LD_DIR, "Wrong length on consensus-digest in detached " - "networkstatus signatures"); - goto err; - } - digests = detached_get_digests(sigs, flavor); - tor_assert(digests); - if (!tor_mem_is_zero(digests->d[alg], digest_length)) { - log_warn(LD_DIR, "Multiple digests for %s with %s on detached " - "signatures document", flavor, algname); - continue; - } - if (base16_decode(digests->d[alg], digest_length, - hexdigest, strlen(hexdigest)) != (int) digest_length) { - log_warn(LD_DIR, "Bad encoding on consensus-digest in detached " - "networkstatus signatures"); - goto err; - } - } SMARTLIST_FOREACH_END(_tok); - - tok = find_by_keyword(tokens, K_VALID_AFTER); - if (parse_iso_time(tok->args[0], &sigs->valid_after)) { - log_warn(LD_DIR, "Bad valid-after in detached networkstatus signatures"); - goto err; - } - - tok = find_by_keyword(tokens, K_FRESH_UNTIL); - if (parse_iso_time(tok->args[0], &sigs->fresh_until)) { - log_warn(LD_DIR, "Bad fresh-until in detached networkstatus signatures"); - goto err; - } - - tok = find_by_keyword(tokens, K_VALID_UNTIL); - if (parse_iso_time(tok->args[0], &sigs->valid_until)) { - log_warn(LD_DIR, "Bad valid-until in detached networkstatus signatures"); - goto err; - } - - SMARTLIST_FOREACH_BEGIN(tokens, directory_token_t *, _tok) { - const char *id_hexdigest; - const char *sk_hexdigest; - const char *algname; - const char *flavor; - digest_algorithm_t alg; - - char id_digest[DIGEST_LEN]; - char sk_digest[DIGEST_LEN]; - smartlist_t *siglist; - document_signature_t *sig; - int is_duplicate; - - tok = _tok; - if (tok->tp == K_DIRECTORY_SIGNATURE) { - tor_assert(tok->n_args >= 2); - flavor = "ns"; - algname = "sha1"; - id_hexdigest = tok->args[0]; - sk_hexdigest = tok->args[1]; - } else if (tok->tp == K_ADDITIONAL_SIGNATURE) { - tor_assert(tok->n_args >= 4); - flavor = tok->args[0]; - algname = tok->args[1]; - id_hexdigest = tok->args[2]; - sk_hexdigest = tok->args[3]; - } else { - continue; - } - - { - int a = crypto_digest_algorithm_parse_name(algname); - if (a<0) { - log_warn(LD_DIR, "Unrecognized algorithm name %s", algname); - continue; - } - alg = (digest_algorithm_t) a; - } - - if (!tok->object_type || - strcmp(tok->object_type, "SIGNATURE") || - tok->object_size < 128 || tok->object_size > 512) { - log_warn(LD_DIR, "Bad object type or length on directory-signature"); - goto err; - } - - if (strlen(id_hexdigest) != HEX_DIGEST_LEN || - base16_decode(id_digest, sizeof(id_digest), - id_hexdigest, HEX_DIGEST_LEN) != sizeof(id_digest)) { - log_warn(LD_DIR, "Error decoding declared identity %s in " - "network-status vote.", escaped(id_hexdigest)); - goto err; - } - if (strlen(sk_hexdigest) != HEX_DIGEST_LEN || - base16_decode(sk_digest, sizeof(sk_digest), - sk_hexdigest, HEX_DIGEST_LEN) != sizeof(sk_digest)) { - log_warn(LD_DIR, "Error decoding declared signing key digest %s in " - "network-status vote.", escaped(sk_hexdigest)); - goto err; - } - - siglist = detached_get_signatures(sigs, flavor); - is_duplicate = 0; - SMARTLIST_FOREACH(siglist, document_signature_t *, dsig, { - if (dsig->alg == alg && - tor_memeq(id_digest, dsig->identity_digest, DIGEST_LEN) && - tor_memeq(sk_digest, dsig->signing_key_digest, DIGEST_LEN)) { - is_duplicate = 1; - } - }); - if (is_duplicate) { - log_warn(LD_DIR, "Two signatures with identical keys and algorithm " - "found."); - continue; - } - - sig = tor_malloc_zero(sizeof(document_signature_t)); - sig->alg = alg; - memcpy(sig->identity_digest, id_digest, DIGEST_LEN); - memcpy(sig->signing_key_digest, sk_digest, DIGEST_LEN); - if (tok->object_size >= INT_MAX || tok->object_size >= SIZE_T_CEILING) { - tor_free(sig); - goto err; - } - sig->signature = tor_memdup(tok->object_body, tok->object_size); - sig->signature_len = (int) tok->object_size; - - smartlist_add(siglist, sig); - } SMARTLIST_FOREACH_END(_tok); - - goto done; - err: - ns_detached_signatures_free(sigs); - sigs = NULL; - done: - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - if (area) { - DUMP_AREA(area, "detached signatures"); - memarea_drop_all(area); - } - return sigs; -} - -/** Parse the addr policy in the string <b>s</b> and return it. If - * assume_action is nonnegative, then insert its action (ADDR_POLICY_ACCEPT or - * ADDR_POLICY_REJECT) for items that specify no action. - * - * Returns NULL on policy errors. - * - * Set *<b>malformed_list</b> to true if the entire policy list should be - * discarded. Otherwise, set it to false, and only this item should be ignored - * on error - the rest of the policy list can continue to be processed and - * used. - * - * The addr_policy_t returned by this function can have its address set to - * AF_UNSPEC for '*'. Use policy_expand_unspec() to turn this into a pair - * of AF_INET and AF_INET6 items. - */ -MOCK_IMPL(addr_policy_t *, -router_parse_addr_policy_item_from_string,(const char *s, int assume_action, - int *malformed_list)) -{ - directory_token_t *tok = NULL; - const char *cp, *eos; - /* Longest possible policy is - * "accept6 [ffff:ffff:..255]/128:10000-65535", - * which contains a max-length IPv6 address, plus 26 characters. - * But note that there can be an arbitrary amount of space between the - * accept and the address:mask/port element. - * We don't need to multiply TOR_ADDR_BUF_LEN by 2, as there is only one - * IPv6 address. But making the buffer shorter might cause valid long lines, - * which parsed in previous versions, to fail to parse in new versions. - * (These lines would have to have excessive amounts of whitespace.) */ - char line[TOR_ADDR_BUF_LEN*2 + 32]; - addr_policy_t *r; - memarea_t *area = NULL; - - tor_assert(malformed_list); - *malformed_list = 0; - - s = eat_whitespace(s); - /* We can only do assume_action on []-quoted IPv6, as "a" (accept) - * and ":" (port separator) are ambiguous */ - if ((*s == '*' || *s == '[' || TOR_ISDIGIT(*s)) && assume_action >= 0) { - if (tor_snprintf(line, sizeof(line), "%s %s", - assume_action == ADDR_POLICY_ACCEPT?"accept":"reject", s)<0) { - log_warn(LD_DIR, "Policy %s is too long.", escaped(s)); - return NULL; - } - cp = line; - tor_strlower(line); - } else { /* assume an already well-formed address policy line */ - cp = s; - } - - eos = cp + strlen(cp); - area = memarea_new(); - tok = get_next_token(area, &cp, eos, routerdesc_token_table); - if (tok->tp == ERR_) { - log_warn(LD_DIR, "Error reading address policy: %s", tok->error); - goto err; - } - if (tok->tp != K_ACCEPT && tok->tp != K_ACCEPT6 && - tok->tp != K_REJECT && tok->tp != K_REJECT6) { - log_warn(LD_DIR, "Expected 'accept' or 'reject'."); - goto err; - } - - /* Use the extended interpretation of accept/reject *, - * expanding it into an IPv4 wildcard and an IPv6 wildcard. - * Also permit *4 and *6 for IPv4 and IPv6 only wildcards. */ - r = router_parse_addr_policy(tok, TAPMP_EXTENDED_STAR); - if (!r) { - goto err; - } - - /* Ensure that accept6/reject6 fields are followed by IPv6 addresses. - * AF_UNSPEC addresses are only permitted on the accept/reject field type. - * Unlike descriptors, torrcs exit policy accept/reject can be followed by - * either an IPv4 or IPv6 address. */ - if ((tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6) && - tor_addr_family(&r->addr) != AF_INET6) { - /* This is a non-fatal error, just ignore this one entry. */ - *malformed_list = 0; - log_warn(LD_DIR, "IPv4 address '%s' with accept6/reject6 field type in " - "exit policy. Ignoring, but continuing to parse rules. (Use " - "accept/reject with IPv4 addresses.)", - tok->n_args == 1 ? tok->args[0] : ""); - addr_policy_free(r); - r = NULL; - goto done; - } - - goto done; - err: - *malformed_list = 1; - r = NULL; - done: - token_clear(tok); - if (area) { - DUMP_AREA(area, "policy item"); - memarea_drop_all(area); - } - return r; -} - -/** Add an exit policy stored in the token <b>tok</b> to the router info in - * <b>router</b>. Return 0 on success, -1 on failure. */ -static int -router_add_exit_policy(routerinfo_t *router, directory_token_t *tok) -{ - addr_policy_t *newe; - /* Use the standard interpretation of accept/reject *, an IPv4 wildcard. */ - newe = router_parse_addr_policy(tok, 0); - if (!newe) - return -1; - if (! router->exit_policy) - router->exit_policy = smartlist_new(); - - /* Ensure that in descriptors, accept/reject fields are followed by - * IPv4 addresses, and accept6/reject6 fields are followed by - * IPv6 addresses. Unlike torrcs, descriptor exit policies do not permit - * accept/reject followed by IPv6. */ - if (((tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6) && - tor_addr_family(&newe->addr) == AF_INET) - || - ((tok->tp == K_ACCEPT || tok->tp == K_REJECT) && - tor_addr_family(&newe->addr) == AF_INET6)) { - /* There's nothing the user can do about other relays' descriptors, - * so we don't provide usage advice here. */ - log_warn(LD_DIR, "Mismatch between field type and address type in exit " - "policy '%s'. Discarding entire router descriptor.", - tok->n_args == 1 ? tok->args[0] : ""); - addr_policy_free(newe); - return -1; - } - - smartlist_add(router->exit_policy, newe); - - return 0; -} - -/** Given a K_ACCEPT[6] or K_REJECT[6] token and a router, create and return - * a new exit_policy_t corresponding to the token. If TAPMP_EXTENDED_STAR - * is set in fmt_flags, K_ACCEPT6 and K_REJECT6 tokens followed by * - * expand to IPv6-only policies, otherwise they expand to IPv4 and IPv6 - * policies */ -static addr_policy_t * -router_parse_addr_policy(directory_token_t *tok, unsigned fmt_flags) -{ - addr_policy_t newe; - char *arg; - - tor_assert(tok->tp == K_REJECT || tok->tp == K_REJECT6 || - tok->tp == K_ACCEPT || tok->tp == K_ACCEPT6); - - if (tok->n_args != 1) - return NULL; - arg = tok->args[0]; - - if (!strcmpstart(arg,"private")) - return router_parse_addr_policy_private(tok); - - memset(&newe, 0, sizeof(newe)); - - if (tok->tp == K_REJECT || tok->tp == K_REJECT6) - newe.policy_type = ADDR_POLICY_REJECT; - else - newe.policy_type = ADDR_POLICY_ACCEPT; - - /* accept6/reject6 * produces an IPv6 wildcard address only. - * (accept/reject * produces rules for IPv4 and IPv6 wildcard addresses.) */ - if ((fmt_flags & TAPMP_EXTENDED_STAR) - && (tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6)) { - fmt_flags |= TAPMP_STAR_IPV6_ONLY; - } - - if (tor_addr_parse_mask_ports(arg, fmt_flags, &newe.addr, &newe.maskbits, - &newe.prt_min, &newe.prt_max) < 0) { - log_warn(LD_DIR,"Couldn't parse line %s. Dropping", escaped(arg)); - return NULL; - } - - return addr_policy_get_canonical_entry(&newe); -} - -/** Parse an exit policy line of the format "accept[6]/reject[6] private:...". - * This didn't exist until Tor 0.1.1.15, so nobody should generate it in - * router descriptors until earlier versions are obsolete. - * - * accept/reject and accept6/reject6 private all produce rules for both - * IPv4 and IPv6 addresses. - */ -static addr_policy_t * -router_parse_addr_policy_private(directory_token_t *tok) -{ - const char *arg; - uint16_t port_min, port_max; - addr_policy_t result; - - arg = tok->args[0]; - if (strcmpstart(arg, "private")) - return NULL; - - arg += strlen("private"); - arg = (char*) eat_whitespace(arg); - if (!arg || *arg != ':') - return NULL; - - if (parse_port_range(arg+1, &port_min, &port_max)<0) - return NULL; - - memset(&result, 0, sizeof(result)); - if (tok->tp == K_REJECT || tok->tp == K_REJECT6) - result.policy_type = ADDR_POLICY_REJECT; - else - result.policy_type = ADDR_POLICY_ACCEPT; - result.is_private = 1; - result.prt_min = port_min; - result.prt_max = port_max; - - if (tok->tp == K_ACCEPT6 || tok->tp == K_REJECT6) { - log_warn(LD_GENERAL, - "'%s' expands into rules which apply to all private IPv4 and " - "IPv6 addresses. (Use accept/reject private:* for IPv4 and " - "IPv6.)", tok->n_args == 1 ? tok->args[0] : ""); - } - - return addr_policy_get_canonical_entry(&result); -} - -/** Log and exit if <b>t</b> is malformed */ -void -assert_addr_policy_ok(smartlist_t *lst) -{ - if (!lst) return; - SMARTLIST_FOREACH(lst, addr_policy_t *, t, { - tor_assert(t->policy_type == ADDR_POLICY_REJECT || - t->policy_type == ADDR_POLICY_ACCEPT); - tor_assert(t->prt_min <= t->prt_max); - }); -} - -/* - * Low-level tokenizer for router descriptors and directories. - */ - -/** Free all resources allocated for <b>tok</b> */ -static void -token_clear(directory_token_t *tok) -{ - if (tok->key) - crypto_pk_free(tok->key); -} - -#define ALLOC_ZERO(sz) memarea_alloc_zero(area,sz) -#define ALLOC(sz) memarea_alloc(area,sz) -#define STRDUP(str) memarea_strdup(area,str) -#define STRNDUP(str,n) memarea_strndup(area,(str),(n)) - -#define RET_ERR(msg) \ - STMT_BEGIN \ - if (tok) token_clear(tok); \ - tok = ALLOC_ZERO(sizeof(directory_token_t)); \ - tok->tp = ERR_; \ - tok->error = STRDUP(msg); \ - goto done_tokenizing; \ - STMT_END - -/** Helper: make sure that the token <b>tok</b> with keyword <b>kwd</b> obeys - * the object syntax of <b>o_syn</b>. Allocate all storage in <b>area</b>. - * Return <b>tok</b> on success, or a new ERR_ token if the token didn't - * conform to the syntax we wanted. - **/ -static inline directory_token_t * -token_check_object(memarea_t *area, const char *kwd, - directory_token_t *tok, obj_syntax o_syn) -{ - char ebuf[128]; - switch (o_syn) { - case NO_OBJ: - /* No object is allowed for this token. */ - if (tok->object_body) { - tor_snprintf(ebuf, sizeof(ebuf), "Unexpected object for %s", kwd); - RET_ERR(ebuf); - } - if (tok->key) { - tor_snprintf(ebuf, sizeof(ebuf), "Unexpected public key for %s", kwd); - RET_ERR(ebuf); - } - break; - case NEED_OBJ: - /* There must be a (non-key) object. */ - if (!tok->object_body) { - tor_snprintf(ebuf, sizeof(ebuf), "Missing object for %s", kwd); - RET_ERR(ebuf); - } - break; - case NEED_KEY_1024: /* There must be a 1024-bit public key. */ - case NEED_SKEY_1024: /* There must be a 1024-bit private key. */ - if (tok->key && crypto_pk_num_bits(tok->key) != PK_BYTES*8) { - tor_snprintf(ebuf, sizeof(ebuf), "Wrong size on key for %s: %d bits", - kwd, crypto_pk_num_bits(tok->key)); - RET_ERR(ebuf); - } - /* fall through */ - case NEED_KEY: /* There must be some kind of key. */ - if (!tok->key) { - tor_snprintf(ebuf, sizeof(ebuf), "Missing public key for %s", kwd); - RET_ERR(ebuf); - } - if (o_syn != NEED_SKEY_1024) { - if (crypto_pk_key_is_private(tok->key)) { - tor_snprintf(ebuf, sizeof(ebuf), - "Private key given for %s, which wants a public key", kwd); - RET_ERR(ebuf); - } - } else { /* o_syn == NEED_SKEY_1024 */ - if (!crypto_pk_key_is_private(tok->key)) { - tor_snprintf(ebuf, sizeof(ebuf), - "Public key given for %s, which wants a private key", kwd); - RET_ERR(ebuf); - } - } - break; - case OBJ_OK: - /* Anything goes with this token. */ - break; - } - - done_tokenizing: - return tok; -} - -/** Helper: parse space-separated arguments from the string <b>s</b> ending at - * <b>eol</b>, and store them in the args field of <b>tok</b>. Store the - * number of parsed elements into the n_args field of <b>tok</b>. Allocate - * all storage in <b>area</b>. Return the number of arguments parsed, or - * return -1 if there was an insanely high number of arguments. */ -static inline int -get_token_arguments(memarea_t *area, directory_token_t *tok, - const char *s, const char *eol) -{ -/** Largest number of arguments we'll accept to any token, ever. */ -#define MAX_ARGS 512 - char *mem = memarea_strndup(area, s, eol-s); - char *cp = mem; - int j = 0; - char *args[MAX_ARGS]; - while (*cp) { - if (j == MAX_ARGS) - return -1; - args[j++] = cp; - cp = (char*)find_whitespace(cp); - if (!cp || !*cp) - break; /* End of the line. */ - *cp++ = '\0'; - cp = (char*)eat_whitespace(cp); - } - tok->n_args = j; - tok->args = memarea_memdup(area, args, j*sizeof(char*)); - return j; -#undef MAX_ARGS -} - -/** Helper function: read the next token from *s, advance *s to the end of the - * token, and return the parsed token. Parse *<b>s</b> according to the list - * of tokens in <b>table</b>. - */ -static directory_token_t * -get_next_token(memarea_t *area, - const char **s, const char *eos, token_rule_t *table) -{ - /** Reject any object at least this big; it is probably an overflow, an - * attack, a bug, or some other nonsense. */ -#define MAX_UNPARSED_OBJECT_SIZE (128*1024) - /** Reject any line at least this big; it is probably an overflow, an - * attack, a bug, or some other nonsense. */ -#define MAX_LINE_LENGTH (128*1024) - - const char *next, *eol, *obstart; - size_t obname_len; - int i; - directory_token_t *tok; - obj_syntax o_syn = NO_OBJ; - char ebuf[128]; - const char *kwd = ""; - - tor_assert(area); - tok = ALLOC_ZERO(sizeof(directory_token_t)); - tok->tp = ERR_; - - /* Set *s to first token, eol to end-of-line, next to after first token */ - *s = eat_whitespace_eos(*s, eos); /* eat multi-line whitespace */ - tor_assert(eos >= *s); - eol = memchr(*s, '\n', eos-*s); - if (!eol) - eol = eos; - if (eol - *s > MAX_LINE_LENGTH) { - RET_ERR("Line far too long"); - } - - next = find_whitespace_eos(*s, eol); - - if (!strcmp_len(*s, "opt", next-*s)) { - /* Skip past an "opt" at the start of the line. */ - *s = eat_whitespace_eos_no_nl(next, eol); - next = find_whitespace_eos(*s, eol); - } else if (*s == eos) { /* If no "opt", and end-of-line, line is invalid */ - RET_ERR("Unexpected EOF"); - } - - /* Search the table for the appropriate entry. (I tried a binary search - * instead, but it wasn't any faster.) */ - for (i = 0; table[i].t ; ++i) { - if (!strcmp_len(*s, table[i].t, next-*s)) { - /* We've found the keyword. */ - kwd = table[i].t; - tok->tp = table[i].v; - o_syn = table[i].os; - *s = eat_whitespace_eos_no_nl(next, eol); - /* We go ahead whether there are arguments or not, so that tok->args is - * always set if we want arguments. */ - if (table[i].concat_args) { - /* The keyword takes the line as a single argument */ - tok->args = ALLOC(sizeof(char*)); - tok->args[0] = STRNDUP(*s,eol-*s); /* Grab everything on line */ - tok->n_args = 1; - } else { - /* This keyword takes multiple arguments. */ - if (get_token_arguments(area, tok, *s, eol)<0) { - tor_snprintf(ebuf, sizeof(ebuf),"Far too many arguments to %s", kwd); - RET_ERR(ebuf); - } - *s = eol; - } - if (tok->n_args < table[i].min_args) { - tor_snprintf(ebuf, sizeof(ebuf), "Too few arguments to %s", kwd); - RET_ERR(ebuf); - } else if (tok->n_args > table[i].max_args) { - tor_snprintf(ebuf, sizeof(ebuf), "Too many arguments to %s", kwd); - RET_ERR(ebuf); - } - break; - } - } - - if (tok->tp == ERR_) { - /* No keyword matched; call it an "K_opt" or "A_unrecognized" */ - if (*s < eol && **s == '@') - tok->tp = A_UNKNOWN_; - else - tok->tp = K_OPT; - tok->args = ALLOC(sizeof(char*)); - tok->args[0] = STRNDUP(*s, eol-*s); - tok->n_args = 1; - o_syn = OBJ_OK; - } - - /* Check whether there's an object present */ - *s = eat_whitespace_eos(eol, eos); /* Scan from end of first line */ - tor_assert(eos >= *s); - eol = memchr(*s, '\n', eos-*s); - if (!eol || eol-*s<11 || strcmpstart(*s, "-----BEGIN ")) /* No object. */ - goto check_object; - - obstart = *s; /* Set obstart to start of object spec */ - if (eol - *s <= 16 || memchr(*s+11,'\0',eol-*s-16) || /* no short lines, */ - strcmp_len(eol-5, "-----", 5) || /* nuls or invalid endings */ - (eol-*s) > MAX_UNPARSED_OBJECT_SIZE) { /* name too long */ - RET_ERR("Malformed object: bad begin line"); - } - tok->object_type = STRNDUP(*s+11, eol-*s-16); - obname_len = eol-*s-16; /* store objname length here to avoid a strlen() */ - *s = eol+1; /* Set *s to possible start of object data (could be eos) */ - - /* Go to the end of the object */ - next = tor_memstr(*s, eos-*s, "-----END "); - if (!next) { - RET_ERR("Malformed object: missing object end line"); - } - tor_assert(eos >= next); - eol = memchr(next, '\n', eos-next); - if (!eol) /* end-of-line marker, or eos if there's no '\n' */ - eol = eos; - /* Validate the ending tag, which should be 9 + NAME + 5 + eol */ - if ((size_t)(eol-next) != 9+obname_len+5 || - strcmp_len(next+9, tok->object_type, obname_len) || - strcmp_len(eol-5, "-----", 5)) { - tor_snprintf(ebuf, sizeof(ebuf), "Malformed object: mismatched end tag %s", - tok->object_type); - ebuf[sizeof(ebuf)-1] = '\0'; - RET_ERR(ebuf); - } - if (next - *s > MAX_UNPARSED_OBJECT_SIZE) - RET_ERR("Couldn't parse object: missing footer or object much too big."); - - if (!strcmp(tok->object_type, "RSA PUBLIC KEY")) { /* If it's a public key */ - tok->key = crypto_pk_new(); - if (crypto_pk_read_public_key_from_string(tok->key, obstart, eol-obstart)) - RET_ERR("Couldn't parse public key."); - } else if (!strcmp(tok->object_type, "RSA PRIVATE KEY")) { /* private key */ - tok->key = crypto_pk_new(); - if (crypto_pk_read_private_key_from_string(tok->key, obstart, eol-obstart)) - RET_ERR("Couldn't parse private key."); - } else { /* If it's something else, try to base64-decode it */ - int r; - tok->object_body = ALLOC(next-*s); /* really, this is too much RAM. */ - r = base64_decode(tok->object_body, next-*s, *s, next-*s); - if (r<0) - RET_ERR("Malformed object: bad base64-encoded data"); - tok->object_size = r; - } - *s = eol; - - check_object: - tok = token_check_object(area, kwd, tok, o_syn); - - done_tokenizing: - return tok; - -#undef RET_ERR -#undef ALLOC -#undef ALLOC_ZERO -#undef STRDUP -#undef STRNDUP -} - -/** Read all tokens from a string between <b>start</b> and <b>end</b>, and add - * them to <b>out</b>. Parse according to the token rules in <b>table</b>. - * Caller must free tokens in <b>out</b>. If <b>end</b> is NULL, use the - * entire string. - */ -static int -tokenize_string(memarea_t *area, - const char *start, const char *end, smartlist_t *out, - token_rule_t *table, int flags) -{ - const char **s; - directory_token_t *tok = NULL; - int counts[NIL_]; - int i; - int first_nonannotation; - int prev_len = smartlist_len(out); - tor_assert(area); - - s = &start; - if (!end) { - end = start+strlen(start); - } else { - /* it's only meaningful to check for nuls if we got an end-of-string ptr */ - if (memchr(start, '\0', end-start)) { - log_warn(LD_DIR, "parse error: internal NUL character."); - return -1; - } - } - for (i = 0; i < NIL_; ++i) - counts[i] = 0; - - SMARTLIST_FOREACH(out, const directory_token_t *, t, ++counts[t->tp]); - - while (*s < end && (!tok || tok->tp != EOF_)) { - tok = get_next_token(area, s, end, table); - if (tok->tp == ERR_) { - log_warn(LD_DIR, "parse error: %s", tok->error); - token_clear(tok); - return -1; - } - ++counts[tok->tp]; - smartlist_add(out, tok); - *s = eat_whitespace_eos(*s, end); - } - - if (flags & TS_NOCHECK) - return 0; - - if ((flags & TS_ANNOTATIONS_OK)) { - first_nonannotation = -1; - for (i = 0; i < smartlist_len(out); ++i) { - tok = smartlist_get(out, i); - if (tok->tp < MIN_ANNOTATION || tok->tp > MAX_ANNOTATION) { - first_nonannotation = i; - break; - } - } - if (first_nonannotation < 0) { - log_warn(LD_DIR, "parse error: item contains only annotations"); - return -1; - } - for (i=first_nonannotation; i < smartlist_len(out); ++i) { - tok = smartlist_get(out, i); - if (tok->tp >= MIN_ANNOTATION && tok->tp <= MAX_ANNOTATION) { - log_warn(LD_DIR, "parse error: Annotations mixed with keywords"); - return -1; - } - } - if ((flags & TS_NO_NEW_ANNOTATIONS)) { - if (first_nonannotation != prev_len) { - log_warn(LD_DIR, "parse error: Unexpected annotations."); - return -1; - } - } - } else { - for (i=0; i < smartlist_len(out); ++i) { - tok = smartlist_get(out, i); - if (tok->tp >= MIN_ANNOTATION && tok->tp <= MAX_ANNOTATION) { - log_warn(LD_DIR, "parse error: no annotations allowed."); - return -1; - } - } - first_nonannotation = 0; - } - for (i = 0; table[i].t; ++i) { - if (counts[table[i].v] < table[i].min_cnt) { - log_warn(LD_DIR, "Parse error: missing %s element.", table[i].t); - return -1; - } - if (counts[table[i].v] > table[i].max_cnt) { - log_warn(LD_DIR, "Parse error: too many %s elements.", table[i].t); - return -1; - } - if (table[i].pos & AT_START) { - if (smartlist_len(out) < 1 || - (tok = smartlist_get(out, first_nonannotation))->tp != table[i].v) { - log_warn(LD_DIR, "Parse error: first item is not %s.", table[i].t); - return -1; - } - } - if (table[i].pos & AT_END) { - if (smartlist_len(out) < 1 || - (tok = smartlist_get(out, smartlist_len(out)-1))->tp != table[i].v) { - log_warn(LD_DIR, "Parse error: last item is not %s.", table[i].t); - return -1; - } - } - } - return 0; -} - -/** Find the first token in <b>s</b> whose keyword is <b>keyword</b>; return - * NULL if no such keyword is found. - */ -static directory_token_t * -find_opt_by_keyword(smartlist_t *s, directory_keyword keyword) -{ - SMARTLIST_FOREACH(s, directory_token_t *, t, if (t->tp == keyword) return t); - return NULL; -} - -/** Find the first token in <b>s</b> whose keyword is <b>keyword</b>; fail - * with an assert if no such keyword is found. - */ -static directory_token_t * -find_by_keyword_(smartlist_t *s, directory_keyword keyword, - const char *keyword_as_string) -{ - directory_token_t *tok = find_opt_by_keyword(s, keyword); - if (PREDICT_UNLIKELY(!tok)) { - log_err(LD_BUG, "Missing %s [%d] in directory object that should have " - "been validated. Internal error.", keyword_as_string, (int)keyword); - tor_assert(tok); - } - return tok; -} - -/** If there are any directory_token_t entries in <b>s</b> whose keyword is - * <b>k</b>, return a newly allocated smartlist_t containing all such entries, - * in the same order in which they occur in <b>s</b>. Otherwise return - * NULL. */ -static smartlist_t * -find_all_by_keyword(smartlist_t *s, directory_keyword k) -{ - smartlist_t *out = NULL; - SMARTLIST_FOREACH(s, directory_token_t *, t, - if (t->tp == k) { - if (!out) - out = smartlist_new(); - smartlist_add(out, t); - }); - return out; -} - -/** Return a newly allocated smartlist of all accept or reject tokens in - * <b>s</b>. - */ -static smartlist_t * -find_all_exitpolicy(smartlist_t *s) -{ - smartlist_t *out = smartlist_new(); - SMARTLIST_FOREACH(s, directory_token_t *, t, - if (t->tp == K_ACCEPT || t->tp == K_ACCEPT6 || - t->tp == K_REJECT || t->tp == K_REJECT6) - smartlist_add(out,t)); - return out; -} - -/** Helper function for <b>router_get_hash_impl</b>: given <b>s</b>, - * <b>s_len</b>, <b>start_str</b>, <b>end_str</b>, and <b>end_c</b> with the - * same semantics as in that function, set *<b>start_out</b> (inclusive) and - * *<b>end_out</b> (exclusive) to the boundaries of the string to be hashed. - * - * Return 0 on success and -1 on failure. - */ -static int -router_get_hash_impl_helper(const char *s, size_t s_len, - const char *start_str, - const char *end_str, char end_c, - const char **start_out, const char **end_out) -{ - const char *start, *end; - start = tor_memstr(s, s_len, start_str); - if (!start) { - log_warn(LD_DIR,"couldn't find start of hashed material \"%s\"",start_str); - return -1; - } - if (start != s && *(start-1) != '\n') { - log_warn(LD_DIR, - "first occurrence of \"%s\" is not at the start of a line", - start_str); - return -1; - } - end = tor_memstr(start+strlen(start_str), - s_len - (start-s) - strlen(start_str), end_str); - if (!end) { - log_warn(LD_DIR,"couldn't find end of hashed material \"%s\"",end_str); - return -1; - } - end = memchr(end+strlen(end_str), end_c, s_len - (end-s) - strlen(end_str)); - if (!end) { - log_warn(LD_DIR,"couldn't find EOL"); - return -1; - } - ++end; - - *start_out = start; - *end_out = end; - return 0; -} - -/** Compute the digest of the substring of <b>s</b> taken from the first - * occurrence of <b>start_str</b> through the first instance of c after the - * first subsequent occurrence of <b>end_str</b>; store the 20-byte or 32-byte - * result in <b>digest</b>; return 0 on success. - * - * If no such substring exists, return -1. - */ -static int -router_get_hash_impl(const char *s, size_t s_len, char *digest, - const char *start_str, - const char *end_str, char end_c, - digest_algorithm_t alg) -{ - const char *start=NULL, *end=NULL; - if (router_get_hash_impl_helper(s,s_len,start_str,end_str,end_c, - &start,&end)<0) - return -1; - - if (alg == DIGEST_SHA1) { - if (crypto_digest(digest, start, end-start)) { - log_warn(LD_BUG,"couldn't compute digest"); - return -1; - } - } else { - if (crypto_digest256(digest, start, end-start, alg)) { - log_warn(LD_BUG,"couldn't compute digest"); - return -1; - } - } - - return 0; -} - -/** As router_get_hash_impl, but compute all hashes. */ -static int -router_get_hashes_impl(const char *s, size_t s_len, common_digests_t *digests, - const char *start_str, - const char *end_str, char end_c) -{ - const char *start=NULL, *end=NULL; - if (router_get_hash_impl_helper(s,s_len,start_str,end_str,end_c, - &start,&end)<0) - return -1; - - if (crypto_common_digests(digests, start, end-start)) { - log_warn(LD_BUG,"couldn't compute digests"); - return -1; - } - - return 0; -} - -/** Assuming that s starts with a microdesc, return the start of the - * *NEXT* one. Return NULL on "not found." */ -static const char * -find_start_of_next_microdesc(const char *s, const char *eos) -{ - int started_with_annotations; - s = eat_whitespace_eos(s, eos); - if (!s) - return NULL; - -#define CHECK_LENGTH() STMT_BEGIN \ - if (eos - s < 32) \ - return NULL; \ - STMT_END - -#define NEXT_LINE() STMT_BEGIN \ - s = memchr(s, '\n', eos-s); \ - if (!s || eos - s <= 1) \ - return NULL; \ - s++; \ - STMT_END - - CHECK_LENGTH(); - - started_with_annotations = (*s == '@'); - - if (started_with_annotations) { - /* Start by advancing to the first non-annotation line. */ - while (*s == '@') - NEXT_LINE(); - } - CHECK_LENGTH(); - - /* Now we should be pointed at an onion-key line. If we are, then skip - * it. */ - if (!strcmpstart(s, "onion-key")) - NEXT_LINE(); - - /* Okay, now we're pointed at the first line of the microdescriptor which is - not an annotation or onion-key. The next line that _is_ an annotation or - onion-key is the start of the next microdescriptor. */ - while (eos - s > 32) { - if (*s == '@' || !strcmpstart(s, "onion-key")) - return s; - NEXT_LINE(); - } - return NULL; - -#undef CHECK_LENGTH -#undef NEXT_LINE -} - -/** Parse as many microdescriptors as are found from the string starting at - * <b>s</b> and ending at <b>eos</b>. If allow_annotations is set, read any - * annotations we recognize and ignore ones we don't. - * - * If <b>saved_location</b> isn't SAVED_IN_CACHE, make a local copy of each - * descriptor in the body field of each microdesc_t. - * - * Return all newly parsed microdescriptors in a newly allocated - * smartlist_t. If <b>invalid_disgests_out</b> is provided, add a SHA256 - * microdesc digest to it for every microdesc that we found to be badly - * formed. (This may cause duplicates) */ -smartlist_t * -microdescs_parse_from_string(const char *s, const char *eos, - int allow_annotations, - saved_location_t where, - smartlist_t *invalid_digests_out) -{ - smartlist_t *tokens; - smartlist_t *result; - microdesc_t *md = NULL; - memarea_t *area; - const char *start = s; - const char *start_of_next_microdesc; - int flags = allow_annotations ? TS_ANNOTATIONS_OK : 0; - const int copy_body = (where != SAVED_IN_CACHE); - - directory_token_t *tok; - - if (!eos) - eos = s + strlen(s); - - s = eat_whitespace_eos(s, eos); - area = memarea_new(); - result = smartlist_new(); - tokens = smartlist_new(); - - while (s < eos) { - int okay = 0; - - start_of_next_microdesc = find_start_of_next_microdesc(s, eos); - if (!start_of_next_microdesc) - start_of_next_microdesc = eos; - - md = tor_malloc_zero(sizeof(microdesc_t)); - { - const char *cp = tor_memstr(s, start_of_next_microdesc-s, - "onion-key"); - const int no_onion_key = (cp == NULL); - if (no_onion_key) { - cp = s; /* So that we have *some* junk to put in the body */ - } - - md->bodylen = start_of_next_microdesc - cp; - md->saved_location = where; - if (copy_body) - md->body = tor_memdup_nulterm(cp, md->bodylen); - else - md->body = (char*)cp; - md->off = cp - start; - crypto_digest256(md->digest, md->body, md->bodylen, DIGEST_SHA256); - if (no_onion_key) { - log_fn(LOG_PROTOCOL_WARN, LD_DIR, "Malformed or truncated descriptor"); - goto next; - } - } - - if (tokenize_string(area, s, start_of_next_microdesc, tokens, - microdesc_token_table, flags)) { - log_warn(LD_DIR, "Unparseable microdescriptor"); - goto next; - } - - if ((tok = find_opt_by_keyword(tokens, A_LAST_LISTED))) { - if (parse_iso_time(tok->args[0], &md->last_listed)) { - log_warn(LD_DIR, "Bad last-listed time in microdescriptor"); - goto next; - } - } - - tok = find_by_keyword(tokens, K_ONION_KEY); - if (!crypto_pk_public_exponent_ok(tok->key)) { - log_warn(LD_DIR, - "Relay's onion key had invalid exponent."); - goto next; - } - md->onion_pkey = tok->key; - tok->key = NULL; - - if ((tok = find_opt_by_keyword(tokens, K_ONION_KEY_NTOR))) { - curve25519_public_key_t k; - tor_assert(tok->n_args >= 1); - if (curve25519_public_from_base64(&k, tok->args[0]) < 0) { - log_warn(LD_DIR, "Bogus ntor-onion-key in microdesc"); - goto next; - } - md->onion_curve25519_pkey = - tor_memdup(&k, sizeof(curve25519_public_key_t)); - } - - smartlist_t *id_lines = find_all_by_keyword(tokens, K_ID); - if (id_lines) { - SMARTLIST_FOREACH_BEGIN(id_lines, directory_token_t *, t) { - tor_assert(t->n_args >= 2); - if (!strcmp(t->args[0], "ed25519")) { - if (md->ed25519_identity_pkey) { - log_warn(LD_DIR, "Extra ed25519 key in microdesc"); - goto next; - } - ed25519_public_key_t k; - if (ed25519_public_from_base64(&k, t->args[1])<0) { - log_warn(LD_DIR, "Bogus ed25519 key in microdesc"); - goto next; - } - md->ed25519_identity_pkey = tor_memdup(&k, sizeof(k)); - } - } SMARTLIST_FOREACH_END(t); - smartlist_free(id_lines); - } - - { - smartlist_t *a_lines = find_all_by_keyword(tokens, K_A); - if (a_lines) { - find_single_ipv6_orport(a_lines, &md->ipv6_addr, &md->ipv6_orport); - smartlist_free(a_lines); - } - } - - if ((tok = find_opt_by_keyword(tokens, K_FAMILY))) { - int i; - md->family = smartlist_new(); - for (i=0;i<tok->n_args;++i) { - if (!is_legal_nickname_or_hexdigest(tok->args[i])) { - log_warn(LD_DIR, "Illegal nickname %s in family line", - escaped(tok->args[i])); - goto next; - } - smartlist_add(md->family, tor_strdup(tok->args[i])); - } - } - - if ((tok = find_opt_by_keyword(tokens, K_P))) { - md->exit_policy = parse_short_policy(tok->args[0]); - } - if ((tok = find_opt_by_keyword(tokens, K_P6))) { - md->ipv6_exit_policy = parse_short_policy(tok->args[0]); - } - - smartlist_add(result, md); - okay = 1; - - md = NULL; - next: - if (! okay && invalid_digests_out) { - smartlist_add(invalid_digests_out, - tor_memdup(md->digest, DIGEST256_LEN)); - } - microdesc_free(md); - md = NULL; - - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - memarea_clear(area); - smartlist_clear(tokens); - s = start_of_next_microdesc; - } - - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - memarea_drop_all(area); - smartlist_free(tokens); - - return result; -} - -/** Extract a Tor version from a <b>platform</b> line from a router - * descriptor, and place the result in <b>router_version</b>. - * - * Return 1 on success, -1 on parsing failure, and 0 if the - * platform line does not indicate some version of Tor. - * - * If <b>strict</b> is non-zero, finding any weird version components - * (like negative numbers) counts as a parsing failure. - */ -int -tor_version_parse_platform(const char *platform, - tor_version_t *router_version, - int strict) -{ - char tmp[128]; - char *s, *s2, *start; - - if (strcmpstart(platform,"Tor ")) /* nonstandard Tor; say 0. */ - return 0; - - start = (char *)eat_whitespace(platform+3); - if (!*start) return -1; - s = (char *)find_whitespace(start); /* also finds '\0', which is fine */ - s2 = (char*)eat_whitespace(s); - if (!strcmpstart(s2, "(r") || !strcmpstart(s2, "(git-")) - s = (char*)find_whitespace(s2); - - if ((size_t)(s-start+1) >= sizeof(tmp)) /* too big, no */ - return -1; - strlcpy(tmp, start, s-start+1); - - if (tor_version_parse(tmp, router_version)<0) { - log_info(LD_DIR,"Router version '%s' unparseable.",tmp); - return -1; - } - - if (strict) { - if (router_version->major < 0 || - router_version->minor < 0 || - router_version->micro < 0 || - router_version->patchlevel < 0 || - router_version->svn_revision < 0) { - return -1; - } - } - - return 1; -} - -/** Parse the Tor version of the platform string <b>platform</b>, - * and compare it to the version in <b>cutoff</b>. Return 1 if - * the router is at least as new as the cutoff, else return 0. - */ -int -tor_version_as_new_as(const char *platform, const char *cutoff) -{ - tor_version_t cutoff_version, router_version; - int r; - tor_assert(platform); - - if (tor_version_parse(cutoff, &cutoff_version)<0) { - log_warn(LD_BUG,"cutoff version '%s' unparseable.",cutoff); - return 0; - } - - r = tor_version_parse_platform(platform, &router_version, 0); - if (r == 0) { - /* nonstandard Tor; be safe and say yes */ - return 1; - } else if (r < 0) { - /* unparseable version; be safe and say yes. */ - return 1; - } - - /* Here's why we don't need to do any special handling for svn revisions: - * - If neither has an svn revision, we're fine. - * - If the router doesn't have an svn revision, we can't assume that it - * is "at least" any svn revision, so we need to return 0. - * - If the target version doesn't have an svn revision, any svn revision - * (or none at all) is good enough, so return 1. - * - If both target and router have an svn revision, we compare them. - */ - - return tor_version_compare(&router_version, &cutoff_version) >= 0; -} - -/** Parse a tor version from <b>s</b>, and store the result in <b>out</b>. - * Return 0 on success, -1 on failure. */ -int -tor_version_parse(const char *s, tor_version_t *out) -{ - char *eos=NULL; - const char *cp=NULL; - int ok = 1; - /* Format is: - * "Tor " ? NUM dot NUM [ dot NUM [ ( pre | rc | dot ) NUM ] ] [ - tag ] - */ - tor_assert(s); - tor_assert(out); - - memset(out, 0, sizeof(tor_version_t)); - out->status = VER_RELEASE; - if (!strcasecmpstart(s, "Tor ")) - s += 4; - - cp = s; - -#define NUMBER(m) \ - do { \ - if (!cp || *cp < '0' || *cp > '9') \ - return -1; \ - out->m = (int)tor_parse_uint64(cp, 10, 0, INT32_MAX, &ok, &eos); \ - if (!ok) \ - return -1; \ - if (!eos || eos == cp) \ - return -1; \ - cp = eos; \ - } while (0) - -#define DOT() \ - do { \ - if (*cp != '.') \ - return -1; \ - ++cp; \ - } while (0) - - NUMBER(major); - DOT(); - NUMBER(minor); - if (*cp == 0) - return 0; - else if (*cp == '-') - goto status_tag; - DOT(); - NUMBER(micro); - - /* Get status */ - if (*cp == 0) { - return 0; - } else if (*cp == '.') { - ++cp; - } else if (*cp == '-') { - goto status_tag; - } else if (0==strncmp(cp, "pre", 3)) { - out->status = VER_PRE; - cp += 3; - } else if (0==strncmp(cp, "rc", 2)) { - out->status = VER_RC; - cp += 2; - } else { - return -1; - } - - NUMBER(patchlevel); - - status_tag: - /* Get status tag. */ - if (*cp == '-' || *cp == '.') - ++cp; - eos = (char*) find_whitespace(cp); - if (eos-cp >= (int)sizeof(out->status_tag)) - strlcpy(out->status_tag, cp, sizeof(out->status_tag)); - else { - memcpy(out->status_tag, cp, eos-cp); - out->status_tag[eos-cp] = 0; - } - cp = eat_whitespace(eos); - - if (!strcmpstart(cp, "(r")) { - cp += 2; - out->svn_revision = (int) strtol(cp,&eos,10); - } else if (!strcmpstart(cp, "(git-")) { - char *close_paren = strchr(cp, ')'); - int hexlen; - char digest[DIGEST_LEN]; - if (! close_paren) - return -1; - cp += 5; - if (close_paren-cp > HEX_DIGEST_LEN) - return -1; - hexlen = (int)(close_paren-cp); - memwipe(digest, 0, sizeof(digest)); - if ( hexlen == 0 || (hexlen % 2) == 1) - return -1; - if (base16_decode(digest, hexlen/2, cp, hexlen) != hexlen/2) - return -1; - memcpy(out->git_tag, digest, hexlen/2); - out->git_tag_len = hexlen/2; - } - - return 0; -#undef NUMBER -#undef DOT -} - -/** Compare two tor versions; Return <0 if a < b; 0 if a ==b, >0 if a > - * b. */ -int -tor_version_compare(tor_version_t *a, tor_version_t *b) -{ - int i; - tor_assert(a); - tor_assert(b); - - /* We take this approach to comparison to ensure the same (bogus!) behavior - * on all inputs as we would have seen before bug #21278 was fixed. The - * only important difference here is that this method doesn't cause - * a signed integer underflow. - */ -#define CMP(field) do { \ - unsigned aval = (unsigned) a->field; \ - unsigned bval = (unsigned) b->field; \ - int result = (int) (aval - bval); \ - if (result < 0) \ - return -1; \ - else if (result > 0) \ - return 1; \ - } while (0) - - CMP(major); - CMP(minor); - CMP(micro); - CMP(status); - CMP(patchlevel); - if ((i = strcmp(a->status_tag, b->status_tag))) - return i; - CMP(svn_revision); - CMP(git_tag_len); - if (a->git_tag_len) - return fast_memcmp(a->git_tag, b->git_tag, a->git_tag_len); - else - return 0; - -#undef CMP -} - -/** Return true iff versions <b>a</b> and <b>b</b> belong to the same series. - */ -int -tor_version_same_series(tor_version_t *a, tor_version_t *b) -{ - tor_assert(a); - tor_assert(b); - return ((a->major == b->major) && - (a->minor == b->minor) && - (a->micro == b->micro)); -} - -/** Helper: Given pointers to two strings describing tor versions, return -1 - * if _a precedes _b, 1 if _b precedes _a, and 0 if they are equivalent. - * Used to sort a list of versions. */ -static int -compare_tor_version_str_ptr_(const void **_a, const void **_b) -{ - const char *a = *_a, *b = *_b; - int ca, cb; - tor_version_t va, vb; - ca = tor_version_parse(a, &va); - cb = tor_version_parse(b, &vb); - /* If they both parse, compare them. */ - if (!ca && !cb) - return tor_version_compare(&va,&vb); - /* If one parses, it comes first. */ - if (!ca && cb) - return -1; - if (ca && !cb) - return 1; - /* If neither parses, compare strings. Also, the directory server admin - ** needs to be smacked upside the head. But Tor is tolerant and gentle. */ - return strcmp(a,b); -} - -/** Sort a list of string-representations of versions in ascending order. */ -void -sort_version_list(smartlist_t *versions, int remove_duplicates) -{ - smartlist_sort(versions, compare_tor_version_str_ptr_); - - if (remove_duplicates) - smartlist_uniq(versions, compare_tor_version_str_ptr_, tor_free_); -} - -/** Parse and validate the ASCII-encoded v2 descriptor in <b>desc</b>, - * write the parsed descriptor to the newly allocated *<b>parsed_out</b>, the - * binary descriptor ID of length DIGEST_LEN to <b>desc_id_out</b>, the - * encrypted introduction points to the newly allocated - * *<b>intro_points_encrypted_out</b>, their encrypted size to - * *<b>intro_points_encrypted_size_out</b>, the size of the encoded descriptor - * to *<b>encoded_size_out</b>, and a pointer to the possibly next - * descriptor to *<b>next_out</b>; return 0 for success (including validation) - * and -1 for failure. - * - * If <b>as_hsdir</b> is 1, we're parsing this as an HSDir, and we should - * be strict about time formats. - */ -int -rend_parse_v2_service_descriptor(rend_service_descriptor_t **parsed_out, - char *desc_id_out, - char **intro_points_encrypted_out, - size_t *intro_points_encrypted_size_out, - size_t *encoded_size_out, - const char **next_out, const char *desc, - int as_hsdir) -{ - rend_service_descriptor_t *result = - tor_malloc_zero(sizeof(rend_service_descriptor_t)); - char desc_hash[DIGEST_LEN]; - const char *eos; - smartlist_t *tokens = smartlist_new(); - directory_token_t *tok; - char secret_id_part[DIGEST_LEN]; - int i, version, num_ok=1; - smartlist_t *versions; - char public_key_hash[DIGEST_LEN]; - char test_desc_id[DIGEST_LEN]; - memarea_t *area = NULL; - const int strict_time_fmt = as_hsdir; - - tor_assert(desc); - /* Check if desc starts correctly. */ - if (strncmp(desc, "rendezvous-service-descriptor ", - strlen("rendezvous-service-descriptor "))) { - log_info(LD_REND, "Descriptor does not start correctly."); - goto err; - } - /* Compute descriptor hash for later validation. */ - if (router_get_hash_impl(desc, strlen(desc), desc_hash, - "rendezvous-service-descriptor ", - "\nsignature", '\n', DIGEST_SHA1) < 0) { - log_warn(LD_REND, "Couldn't compute descriptor hash."); - goto err; - } - /* Determine end of string. */ - eos = strstr(desc, "\nrendezvous-service-descriptor "); - if (!eos) - eos = desc + strlen(desc); - else - eos = eos + 1; - /* Check length. */ - if (eos-desc > REND_DESC_MAX_SIZE) { - /* XXXX+ If we are parsing this descriptor as a server, this - * should be a protocol warning. */ - log_warn(LD_REND, "Descriptor length is %d which exceeds " - "maximum rendezvous descriptor size of %d bytes.", - (int)(eos-desc), REND_DESC_MAX_SIZE); - goto err; - } - /* Tokenize descriptor. */ - area = memarea_new(); - if (tokenize_string(area, desc, eos, tokens, desc_token_table, 0)) { - log_warn(LD_REND, "Error tokenizing descriptor."); - goto err; - } - /* Set next to next descriptor, if available. */ - *next_out = eos; - /* Set length of encoded descriptor. */ - *encoded_size_out = eos - desc; - /* Check min allowed length of token list. */ - if (smartlist_len(tokens) < 7) { - log_warn(LD_REND, "Impossibly short descriptor."); - goto err; - } - /* Parse base32-encoded descriptor ID. */ - tok = find_by_keyword(tokens, R_RENDEZVOUS_SERVICE_DESCRIPTOR); - tor_assert(tok == smartlist_get(tokens, 0)); - tor_assert(tok->n_args == 1); - if (!rend_valid_descriptor_id(tok->args[0])) { - log_warn(LD_REND, "Invalid descriptor ID: '%s'", tok->args[0]); - goto err; - } - if (base32_decode(desc_id_out, DIGEST_LEN, - tok->args[0], REND_DESC_ID_V2_LEN_BASE32) < 0) { - log_warn(LD_REND, "Descriptor ID contains illegal characters: %s", - tok->args[0]); - goto err; - } - /* Parse descriptor version. */ - tok = find_by_keyword(tokens, R_VERSION); - tor_assert(tok->n_args == 1); - result->version = - (int) tor_parse_long(tok->args[0], 10, 0, INT_MAX, &num_ok, NULL); - if (result->version != 2 || !num_ok) { - /* If it's <2, it shouldn't be under this format. If the number - * is greater than 2, we bumped it because we broke backward - * compatibility. See how version numbers in our other formats - * work. */ - log_warn(LD_REND, "Unrecognized descriptor version: %s", - escaped(tok->args[0])); - goto err; - } - /* Parse public key. */ - tok = find_by_keyword(tokens, R_PERMANENT_KEY); - result->pk = tok->key; - tok->key = NULL; /* Prevent free */ - /* Parse secret ID part. */ - tok = find_by_keyword(tokens, R_SECRET_ID_PART); - tor_assert(tok->n_args == 1); - if (strlen(tok->args[0]) != REND_SECRET_ID_PART_LEN_BASE32 || - strspn(tok->args[0], BASE32_CHARS) != REND_SECRET_ID_PART_LEN_BASE32) { - log_warn(LD_REND, "Invalid secret ID part: '%s'", tok->args[0]); - goto err; - } - if (base32_decode(secret_id_part, DIGEST_LEN, tok->args[0], 32) < 0) { - log_warn(LD_REND, "Secret ID part contains illegal characters: %s", - tok->args[0]); - goto err; - } - /* Parse publication time -- up-to-date check is done when storing the - * descriptor. */ - tok = find_by_keyword(tokens, R_PUBLICATION_TIME); - tor_assert(tok->n_args == 1); - if (parse_iso_time_(tok->args[0], &result->timestamp, strict_time_fmt) < 0) { - log_warn(LD_REND, "Invalid publication time: '%s'", tok->args[0]); - goto err; - } - /* Parse protocol versions. */ - tok = find_by_keyword(tokens, R_PROTOCOL_VERSIONS); - tor_assert(tok->n_args == 1); - versions = smartlist_new(); - smartlist_split_string(versions, tok->args[0], ",", - SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); - for (i = 0; i < smartlist_len(versions); i++) { - version = (int) tor_parse_long(smartlist_get(versions, i), - 10, 0, INT_MAX, &num_ok, NULL); - if (!num_ok) /* It's a string; let's ignore it. */ - continue; - if (version >= REND_PROTOCOL_VERSION_BITMASK_WIDTH) - /* Avoid undefined left-shift behaviour. */ - continue; - result->protocols |= 1 << version; - } - SMARTLIST_FOREACH(versions, char *, cp, tor_free(cp)); - smartlist_free(versions); - /* Parse encrypted introduction points. Don't verify. */ - tok = find_opt_by_keyword(tokens, R_INTRODUCTION_POINTS); - if (tok) { - if (strcmp(tok->object_type, "MESSAGE")) { - log_warn(LD_DIR, "Bad object type: introduction points should be of " - "type MESSAGE"); - goto err; - } - *intro_points_encrypted_out = tor_memdup(tok->object_body, - tok->object_size); - *intro_points_encrypted_size_out = tok->object_size; - } else { - *intro_points_encrypted_out = NULL; - *intro_points_encrypted_size_out = 0; - } - /* Parse and verify signature. */ - tok = find_by_keyword(tokens, R_SIGNATURE); - note_crypto_pk_op(VERIFY_RTR); - if (check_signature_token(desc_hash, DIGEST_LEN, tok, result->pk, 0, - "v2 rendezvous service descriptor") < 0) - goto err; - /* Verify that descriptor ID belongs to public key and secret ID part. */ - crypto_pk_get_digest(result->pk, public_key_hash); - rend_get_descriptor_id_bytes(test_desc_id, public_key_hash, - secret_id_part); - if (tor_memneq(desc_id_out, test_desc_id, DIGEST_LEN)) { - log_warn(LD_REND, "Parsed descriptor ID does not match " - "computed descriptor ID."); - goto err; - } - goto done; - err: - rend_service_descriptor_free(result); - result = NULL; - done: - if (tokens) { - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - } - if (area) - memarea_drop_all(area); - *parsed_out = result; - if (result) - return 0; - return -1; -} - -/** Decrypt the encrypted introduction points in <b>ipos_encrypted</b> of - * length <b>ipos_encrypted_size</b> using <b>descriptor_cookie</b> and - * write the result to a newly allocated string that is pointed to by - * <b>ipos_decrypted</b> and its length to <b>ipos_decrypted_size</b>. - * Return 0 if decryption was successful and -1 otherwise. */ -int -rend_decrypt_introduction_points(char **ipos_decrypted, - size_t *ipos_decrypted_size, - const char *descriptor_cookie, - const char *ipos_encrypted, - size_t ipos_encrypted_size) -{ - tor_assert(ipos_encrypted); - tor_assert(descriptor_cookie); - if (ipos_encrypted_size < 2) { - log_warn(LD_REND, "Size of encrypted introduction points is too " - "small."); - return -1; - } - if (ipos_encrypted[0] == (int)REND_BASIC_AUTH) { - char iv[CIPHER_IV_LEN], client_id[REND_BASIC_AUTH_CLIENT_ID_LEN], - session_key[CIPHER_KEY_LEN], *dec; - int declen, client_blocks; - size_t pos = 0, len, client_entries_len; - crypto_digest_t *digest; - crypto_cipher_t *cipher; - client_blocks = (int) ipos_encrypted[1]; - client_entries_len = client_blocks * REND_BASIC_AUTH_CLIENT_MULTIPLE * - REND_BASIC_AUTH_CLIENT_ENTRY_LEN; - if (ipos_encrypted_size < 2 + client_entries_len + CIPHER_IV_LEN + 1) { - log_warn(LD_REND, "Size of encrypted introduction points is too " - "small."); - return -1; - } - memcpy(iv, ipos_encrypted + 2 + client_entries_len, CIPHER_IV_LEN); - digest = crypto_digest_new(); - crypto_digest_add_bytes(digest, descriptor_cookie, REND_DESC_COOKIE_LEN); - crypto_digest_add_bytes(digest, iv, CIPHER_IV_LEN); - crypto_digest_get_digest(digest, client_id, - REND_BASIC_AUTH_CLIENT_ID_LEN); - crypto_digest_free(digest); - for (pos = 2; pos < 2 + client_entries_len; - pos += REND_BASIC_AUTH_CLIENT_ENTRY_LEN) { - if (tor_memeq(ipos_encrypted + pos, client_id, - REND_BASIC_AUTH_CLIENT_ID_LEN)) { - /* Attempt to decrypt introduction points. */ - cipher = crypto_cipher_new(descriptor_cookie); - if (crypto_cipher_decrypt(cipher, session_key, ipos_encrypted - + pos + REND_BASIC_AUTH_CLIENT_ID_LEN, - CIPHER_KEY_LEN) < 0) { - log_warn(LD_REND, "Could not decrypt session key for client."); - crypto_cipher_free(cipher); - return -1; - } - crypto_cipher_free(cipher); - - len = ipos_encrypted_size - 2 - client_entries_len - CIPHER_IV_LEN; - dec = tor_malloc_zero(len + 1); - declen = crypto_cipher_decrypt_with_iv(session_key, dec, len, - ipos_encrypted + 2 + client_entries_len, - ipos_encrypted_size - 2 - client_entries_len); - - if (declen < 0) { - log_warn(LD_REND, "Could not decrypt introduction point string."); - tor_free(dec); - return -1; - } - if (fast_memcmpstart(dec, declen, "introduction-point ")) { - log_warn(LD_REND, "Decrypted introduction points don't " - "look like we could parse them."); - tor_free(dec); - continue; - } - *ipos_decrypted = dec; - *ipos_decrypted_size = declen; - return 0; - } - } - log_warn(LD_REND, "Could not decrypt introduction points. Please " - "check your authorization for this service!"); - return -1; - } else if (ipos_encrypted[0] == (int)REND_STEALTH_AUTH) { - char *dec; - int declen; - if (ipos_encrypted_size < CIPHER_IV_LEN + 2) { - log_warn(LD_REND, "Size of encrypted introduction points is too " - "small."); - return -1; - } - dec = tor_malloc_zero(ipos_encrypted_size - CIPHER_IV_LEN - 1 + 1); - - declen = crypto_cipher_decrypt_with_iv(descriptor_cookie, dec, - ipos_encrypted_size - - CIPHER_IV_LEN - 1, - ipos_encrypted + 1, - ipos_encrypted_size - 1); - - if (declen < 0) { - log_warn(LD_REND, "Decrypting introduction points failed!"); - tor_free(dec); - return -1; - } - *ipos_decrypted = dec; - *ipos_decrypted_size = declen; - return 0; - } else { - log_warn(LD_REND, "Unknown authorization type number: %d", - ipos_encrypted[0]); - return -1; - } -} - -/** Parse the encoded introduction points in <b>intro_points_encoded</b> of - * length <b>intro_points_encoded_size</b> and write the result to the - * descriptor in <b>parsed</b>; return the number of successfully parsed - * introduction points or -1 in case of a failure. */ -int -rend_parse_introduction_points(rend_service_descriptor_t *parsed, - const char *intro_points_encoded, - size_t intro_points_encoded_size) -{ - const char *current_ipo, *end_of_intro_points; - smartlist_t *tokens = NULL; - directory_token_t *tok; - rend_intro_point_t *intro; - extend_info_t *info; - int result, num_ok=1; - memarea_t *area = NULL; - tor_assert(parsed); - /** Function may only be invoked once. */ - tor_assert(!parsed->intro_nodes); - if (!intro_points_encoded || intro_points_encoded_size == 0) { - log_warn(LD_REND, "Empty or zero size introduction point list"); - goto err; - } - /* Consider one intro point after the other. */ - current_ipo = intro_points_encoded; - end_of_intro_points = intro_points_encoded + intro_points_encoded_size; - tokens = smartlist_new(); - parsed->intro_nodes = smartlist_new(); - area = memarea_new(); - - while (!fast_memcmpstart(current_ipo, end_of_intro_points-current_ipo, - "introduction-point ")) { - /* Determine end of string. */ - const char *eos = tor_memstr(current_ipo, end_of_intro_points-current_ipo, - "\nintroduction-point "); - if (!eos) - eos = end_of_intro_points; - else - eos = eos+1; - tor_assert(eos <= intro_points_encoded+intro_points_encoded_size); - /* Free tokens and clear token list. */ - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_clear(tokens); - memarea_clear(area); - /* Tokenize string. */ - if (tokenize_string(area, current_ipo, eos, tokens, ipo_token_table, 0)) { - log_warn(LD_REND, "Error tokenizing introduction point"); - goto err; - } - /* Advance to next introduction point, if available. */ - current_ipo = eos; - /* Check minimum allowed length of introduction point. */ - if (smartlist_len(tokens) < 5) { - log_warn(LD_REND, "Impossibly short introduction point."); - goto err; - } - /* Allocate new intro point and extend info. */ - intro = tor_malloc_zero(sizeof(rend_intro_point_t)); - info = intro->extend_info = tor_malloc_zero(sizeof(extend_info_t)); - /* Parse identifier. */ - tok = find_by_keyword(tokens, R_IPO_IDENTIFIER); - if (base32_decode(info->identity_digest, DIGEST_LEN, - tok->args[0], REND_INTRO_POINT_ID_LEN_BASE32) < 0) { - log_warn(LD_REND, "Identity digest contains illegal characters: %s", - tok->args[0]); - rend_intro_point_free(intro); - goto err; - } - /* Write identifier to nickname. */ - info->nickname[0] = '$'; - base16_encode(info->nickname + 1, sizeof(info->nickname) - 1, - info->identity_digest, DIGEST_LEN); - /* Parse IP address. */ - tok = find_by_keyword(tokens, R_IPO_IP_ADDRESS); - if (tor_addr_parse(&info->addr, tok->args[0])<0) { - log_warn(LD_REND, "Could not parse introduction point address."); - rend_intro_point_free(intro); - goto err; - } - if (tor_addr_family(&info->addr) != AF_INET) { - log_warn(LD_REND, "Introduction point address was not ipv4."); - rend_intro_point_free(intro); - goto err; - } - - /* Parse onion port. */ - tok = find_by_keyword(tokens, R_IPO_ONION_PORT); - info->port = (uint16_t) tor_parse_long(tok->args[0],10,1,65535, - &num_ok,NULL); - if (!info->port || !num_ok) { - log_warn(LD_REND, "Introduction point onion port %s is invalid", - escaped(tok->args[0])); - rend_intro_point_free(intro); - goto err; - } - /* Parse onion key. */ - tok = find_by_keyword(tokens, R_IPO_ONION_KEY); - if (!crypto_pk_public_exponent_ok(tok->key)) { - log_warn(LD_REND, - "Introduction point's onion key had invalid exponent."); - rend_intro_point_free(intro); - goto err; - } - info->onion_key = tok->key; - tok->key = NULL; /* Prevent free */ - /* Parse service key. */ - tok = find_by_keyword(tokens, R_IPO_SERVICE_KEY); - if (!crypto_pk_public_exponent_ok(tok->key)) { - log_warn(LD_REND, - "Introduction point key had invalid exponent."); - rend_intro_point_free(intro); - goto err; - } - intro->intro_key = tok->key; - tok->key = NULL; /* Prevent free */ - /* Add extend info to list of introduction points. */ - smartlist_add(parsed->intro_nodes, intro); - } - result = smartlist_len(parsed->intro_nodes); - goto done; - - err: - result = -1; - - done: - /* Free tokens and clear token list. */ - if (tokens) { - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - } - if (area) - memarea_drop_all(area); - - return result; -} - -/** Parse the content of a client_key file in <b>ckstr</b> and add - * rend_authorized_client_t's for each parsed client to - * <b>parsed_clients</b>. Return the number of parsed clients as result - * or -1 for failure. */ -int -rend_parse_client_keys(strmap_t *parsed_clients, const char *ckstr) -{ - int result = -1; - smartlist_t *tokens; - directory_token_t *tok; - const char *current_entry = NULL; - memarea_t *area = NULL; - char *err_msg = NULL; - if (!ckstr || strlen(ckstr) == 0) - return -1; - tokens = smartlist_new(); - /* Begin parsing with first entry, skipping comments or whitespace at the - * beginning. */ - area = memarea_new(); - current_entry = eat_whitespace(ckstr); - while (!strcmpstart(current_entry, "client-name ")) { - rend_authorized_client_t *parsed_entry; - /* Determine end of string. */ - const char *eos = strstr(current_entry, "\nclient-name "); - if (!eos) - eos = current_entry + strlen(current_entry); - else - eos = eos + 1; - /* Free tokens and clear token list. */ - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_clear(tokens); - memarea_clear(area); - /* Tokenize string. */ - if (tokenize_string(area, current_entry, eos, tokens, - client_keys_token_table, 0)) { - log_warn(LD_REND, "Error tokenizing client keys file."); - goto err; - } - /* Advance to next entry, if available. */ - current_entry = eos; - /* Check minimum allowed length of token list. */ - if (smartlist_len(tokens) < 2) { - log_warn(LD_REND, "Impossibly short client key entry."); - goto err; - } - /* Parse client name. */ - tok = find_by_keyword(tokens, C_CLIENT_NAME); - tor_assert(tok == smartlist_get(tokens, 0)); - tor_assert(tok->n_args == 1); - - if (!rend_valid_client_name(tok->args[0])) { - log_warn(LD_CONFIG, "Illegal client name: %s. (Length must be " - "between 1 and %d, and valid characters are " - "[A-Za-z0-9+-_].)", tok->args[0], REND_CLIENTNAME_MAX_LEN); - goto err; - } - /* Check if client name is duplicate. */ - if (strmap_get(parsed_clients, tok->args[0])) { - log_warn(LD_CONFIG, "HiddenServiceAuthorizeClient contains a " - "duplicate client name: '%s'. Ignoring.", tok->args[0]); - goto err; - } - parsed_entry = tor_malloc_zero(sizeof(rend_authorized_client_t)); - parsed_entry->client_name = tor_strdup(tok->args[0]); - strmap_set(parsed_clients, parsed_entry->client_name, parsed_entry); - /* Parse client key. */ - tok = find_opt_by_keyword(tokens, C_CLIENT_KEY); - if (tok) { - parsed_entry->client_key = tok->key; - tok->key = NULL; /* Prevent free */ - } - - /* Parse descriptor cookie. */ - tok = find_by_keyword(tokens, C_DESCRIPTOR_COOKIE); - tor_assert(tok->n_args == 1); - if (rend_auth_decode_cookie(tok->args[0], parsed_entry->descriptor_cookie, - NULL, &err_msg) < 0) { - tor_assert(err_msg); - log_warn(LD_REND, "%s", err_msg); - tor_free(err_msg); - goto err; - } - } - result = strmap_size(parsed_clients); - goto done; - err: - result = -1; - done: - /* Free tokens and clear token list. */ - SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t)); - smartlist_free(tokens); - if (area) - memarea_drop_all(area); - return result; -} - -/** Called on startup; right now we just handle scanning the unparseable - * descriptor dumps, but hang anything else we might need to do in the - * future here as well. - */ -void -routerparse_init(void) -{ - /* - * Check both if the sandbox is active and whether it's configured; no - * point in loading all that if we won't be able to use it after the - * sandbox becomes active. - */ - if (!(sandbox_is_active() || get_options()->Sandbox)) { - dump_desc_init(); - } -} - -/** Clean up all data structures used by routerparse.c at exit */ -void -routerparse_free_all(void) -{ - dump_desc_fifo_cleanup(); -} |