diff options
Diffstat (limited to 'src/core/or/policies.c')
| -rw-r--r-- | src/core/or/policies.c | 243 |
1 files changed, 140 insertions, 103 deletions
diff --git a/src/core/or/policies.c b/src/core/or/policies.c index 3ed282d785..2bf2dc7005 100644 --- a/src/core/or/policies.c +++ b/src/core/or/policies.c @@ -1,6 +1,6 @@ /* Copyright (c) 2001-2004, Roger Dingledine. * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. - * Copyright (c) 2007-2019, The Tor Project, Inc. */ + * Copyright (c) 2007-2020, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** @@ -29,7 +29,9 @@ #include "feature/relay/routermode.h" #include "lib/geoip/geoip.h" #include "ht.h" +#include "lib/crypt_ops/crypto_rand.h" #include "lib/encoding/confline.h" +#include "trunnel/ed25519_cert.h" #include "core/or/addr_policy_st.h" #include "feature/dirclient/dir_server_st.h" @@ -165,7 +167,7 @@ policy_expand_unspec(smartlist_t **policy) } tor_addr_from_ipv4h(&newpolicy_ipv4.addr, 0); tor_addr_from_ipv6_bytes(&newpolicy_ipv6.addr, - "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); + (const uint8_t *)"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); smartlist_add(tmp, addr_policy_get_canonical_entry(&newpolicy_ipv4)); smartlist_add(tmp, addr_policy_get_canonical_entry(&newpolicy_ipv6)); addr_policy_free(p); @@ -918,49 +920,6 @@ fascist_firewall_choose_address_ipv4h(uint32_t ipv4h_addr, pref_ipv6, ap); } -/* Some microdescriptor consensus methods have no IPv6 addresses in rs: they - * are in the microdescriptors. For these consensus methods, we can't rely on - * the node's IPv6 address until its microdescriptor is available (when using - * microdescs). - * But for bridges, rewrite_node_address_for_bridge() updates node->ri with - * the configured address, so we can trust bridge addresses. - * (Bridges could gain an IPv6 address if their microdescriptor arrives, but - * this will never be their preferred address: that is in the config.) - * Returns true if the node needs a microdescriptor for its IPv6 address, and - * false if the addresses in the node are already up-to-date. - */ -static int -node_awaiting_ipv6(const or_options_t* options, const node_t *node) -{ - tor_assert(node); - - /* There's no point waiting for an IPv6 address if we'd never use it */ - if (!fascist_firewall_use_ipv6(options)) { - return 0; - } - - /* If the node has an IPv6 address, we're not waiting */ - if (node_has_ipv6_addr(node)) { - return 0; - } - - /* If the current consensus method and flavour has IPv6 addresses, we're not - * waiting */ - if (networkstatus_consensus_has_ipv6(options)) { - return 0; - } - - /* Bridge clients never use the address from a bridge's md, so there's no - * need to wait for it. */ - if (node_is_a_configured_bridge(node)) { - return 0; - } - - /* We are waiting if we_use_microdescriptors_for_circuits() and we have no - * md. */ - return (!node->md && we_use_microdescriptors_for_circuits(options)); -} - /** Like fascist_firewall_choose_address_base(), but takes <b>rs</b>. * Consults the corresponding node, then falls back to rs if node is NULL. * This should only happen when there's no valid consensus, and rs doesn't @@ -983,7 +942,7 @@ fascist_firewall_choose_address_rs(const routerstatus_t *rs, const or_options_t *options = get_options(); const node_t *node = node_get_by_id(rs->identity_digest); - if (node && !node_awaiting_ipv6(options, node)) { + if (node) { fascist_firewall_choose_address_node(node, fw_connection, pref_only, ap); } else { /* There's no node-specific IPv6 preference, so use the generic IPv6 @@ -1001,6 +960,83 @@ fascist_firewall_choose_address_rs(const routerstatus_t *rs, } } +/** Like fascist_firewall_choose_address_base(), but takes in a smartlist + * <b>lspecs</b> consisting of one or more link specifiers. We assume + * fw_connection is FIREWALL_OR_CONNECTION as link specifiers cannot + * contain DirPorts. + */ +void +fascist_firewall_choose_address_ls(const smartlist_t *lspecs, + int pref_only, tor_addr_port_t* ap) +{ + int have_v4 = 0, have_v6 = 0; + uint16_t port_v4 = 0, port_v6 = 0; + tor_addr_t addr_v4, addr_v6; + + tor_assert(ap); + + if (lspecs == NULL) { + log_warn(LD_BUG, "Unknown or missing link specifiers"); + return; + } + if (smartlist_len(lspecs) == 0) { + log_warn(LD_PROTOCOL, "Link specifiers are empty"); + return; + } + + tor_addr_make_null(&ap->addr, AF_UNSPEC); + ap->port = 0; + + tor_addr_make_null(&addr_v4, AF_INET); + tor_addr_make_null(&addr_v6, AF_INET6); + + SMARTLIST_FOREACH_BEGIN(lspecs, const link_specifier_t *, ls) { + switch (link_specifier_get_ls_type(ls)) { + case LS_IPV4: + /* Skip if we already seen a v4. */ + if (have_v4) continue; + tor_addr_from_ipv4h(&addr_v4, + link_specifier_get_un_ipv4_addr(ls)); + port_v4 = link_specifier_get_un_ipv4_port(ls); + have_v4 = 1; + break; + case LS_IPV6: + /* Skip if we already seen a v6, or deliberately skip it if we're not a + * direct connection. */ + if (have_v6) continue; + tor_addr_from_ipv6_bytes(&addr_v6, + link_specifier_getconstarray_un_ipv6_addr(ls)); + port_v6 = link_specifier_get_un_ipv6_port(ls); + have_v6 = 1; + break; + default: + /* Ignore unknown. */ + break; + } + } SMARTLIST_FOREACH_END(ls); + + /* If we don't have IPv4 or IPv6 in link specifiers, log a bug and return. */ + if (!have_v4 && !have_v6) { + if (!have_v6) { + log_warn(LD_PROTOCOL, "None of our link specifiers have IPv4 or IPv6"); + } else { + log_warn(LD_PROTOCOL, "None of our link specifiers have IPv4"); + } + return; + } + + /* Here, don't check for DirPorts as link specifiers are only used for + * ORPorts. */ + const or_options_t *options = get_options(); + int pref_ipv6 = fascist_firewall_prefer_ipv6_orport(options); + /* Assume that the DirPorts are zero as link specifiers only use ORPorts. */ + fascist_firewall_choose_address_base(&addr_v4, port_v4, 0, + &addr_v6, port_v6, 0, + FIREWALL_OR_CONNECTION, + pref_only, pref_ipv6, + ap); +} + /** Like fascist_firewall_choose_address_base(), but takes <b>node</b>, and * looks up the node's IPv6 preference rather than taking an argument * for pref_ipv6. */ @@ -1019,17 +1055,6 @@ fascist_firewall_choose_address_node(const node_t *node, } node_assert_ok(node); - /* Calling fascist_firewall_choose_address_node() when the node is missing - * IPv6 information breaks IPv6-only clients. - * If the node is a hard-coded fallback directory or authority, call - * fascist_firewall_choose_address_rs() on the fake (hard-coded) routerstatus - * for the node. - * If it is not hard-coded, check that the node has a microdescriptor, full - * descriptor (routerinfo), or is one of our configured bridges before - * calling this function. */ - if (BUG(node_awaiting_ipv6(get_options(), node))) { - return; - } const int pref_ipv6_node = (fw_connection == FIREWALL_OR_CONNECTION ? node_ipv6_or_preferred(node) @@ -1150,6 +1175,15 @@ authdir_policy_badexit_address(uint32_t addr, uint16_t port) #define REJECT(arg) \ STMT_BEGIN *msg = tor_strdup(arg); goto err; STMT_END +/** Check <b>or_options</b> to determine whether or not we are using the + * default options for exit policy. Return true if so, false otherwise. */ +static int +policy_using_default_exit_options(const or_options_t *or_options) +{ + return (or_options->ExitPolicy == NULL && or_options->ExitRelay == -1 && + or_options->ReducedExitPolicy == 0 && or_options->IPv6Exit == 0); +} + /** Config helper: If there's any problem with the policy configuration * options in <b>options</b>, return -1 and set <b>msg</b> to a newly * allocated description of the error. Else return 0. */ @@ -1168,9 +1202,8 @@ validate_addr_policies(const or_options_t *options, char **msg) static int warned_about_nonexit = 0; - if (public_server_mode(options) && - !warned_about_nonexit && options->ExitPolicy == NULL && - options->ExitRelay == -1 && options->ReducedExitPolicy == 0) { + if (public_server_mode(options) && !warned_about_nonexit && + policy_using_default_exit_options(options)) { warned_about_nonexit = 1; log_notice(LD_CONFIG, "By default, Tor does not run as an exit relay. " "If you want to be an exit relay, " @@ -1359,9 +1392,9 @@ policy_hash(const policy_map_ent_t *ent) } HT_PROTOTYPE(policy_map, policy_map_ent_t, node, policy_hash, - policy_eq) + policy_eq); HT_GENERATE2(policy_map, policy_map_ent_t, node, policy_hash, - policy_eq, 0.6, tor_reallocarray_, tor_free_) + policy_eq, 0.6, tor_reallocarray_, tor_free_); /** Given a pointer to an addr_policy_t, return a copy of the pointer to the * "canonical" copy of that addr_policy_t; the canonical copy is a single @@ -2127,9 +2160,9 @@ policies_parse_exit_policy_from_options(const or_options_t *or_options, int rv = 0; /* Short-circuit for non-exit relays, or for relays where we didn't specify - * ExitPolicy or ReducedExitPolicy and ExitRelay is auto. */ - if (or_options->ExitRelay == 0 || (or_options->ExitPolicy == NULL && - or_options->ExitRelay == -1 && or_options->ReducedExitPolicy == 0)) { + * ExitPolicy or ReducedExitPolicy or IPv6Exit and ExitRelay is auto. */ + if (or_options->ExitRelay == 0 || + policy_using_default_exit_options(or_options)) { append_exit_policy_string(result, "reject *4:*"); append_exit_policy_string(result, "reject *6:*"); return 0; @@ -2706,7 +2739,7 @@ parse_short_policy(const char *summary) int is_accept; int n_entries; short_policy_entry_t entries[MAX_EXITPOLICY_SUMMARY_LEN]; /* overkill */ - const char *next; + char *next; if (!strcmpstart(summary, "accept ")) { is_accept = 1; @@ -2721,57 +2754,56 @@ parse_short_policy(const char *summary) n_entries = 0; for ( ; *summary; summary = next) { - const char *comma = strchr(summary, ','); - unsigned low, high; - char dummy; - char ent_buf[32]; - size_t len; - - next = comma ? comma+1 : strchr(summary, '\0'); - len = comma ? (size_t)(comma - summary) : strlen(summary); - if (n_entries == MAX_EXITPOLICY_SUMMARY_LEN) { log_fn(LOG_PROTOCOL_WARN, LD_DIR, "Impossibly long policy summary %s", escaped(orig_summary)); return NULL; } - if (! TOR_ISDIGIT(*summary) || len > (sizeof(ent_buf)-1)) { - /* unrecognized entry format. skip it. */ - continue; - } - if (len < 1) { - /* empty; skip it. */ - /* XXX This happens to be unreachable, since if len==0, then *summary is - * ',' or '\0', and the TOR_ISDIGIT test above would have failed. */ - continue; + unsigned low, high; + int ok; + low = (unsigned) tor_parse_ulong(summary, 10, 1, 65535, &ok, &next); + if (!ok) { + if (! TOR_ISDIGIT(*summary) || *summary == ',') { + /* Unrecognized format: skip it. */ + goto skip_ent; + } else { + goto bad_ent; + } } - memcpy(ent_buf, summary, len); - ent_buf[len] = '\0'; + switch (*next) { + case ',': + ++next; + FALLTHROUGH; + case '\0': + high = low; + break; + case '-': + high = (unsigned) tor_parse_ulong(next+1, 10, low, 65535, &ok, &next); + if (!ok) + goto bad_ent; - if (tor_sscanf(ent_buf, "%u-%u%c", &low, &high, &dummy) == 2) { - if (low<1 || low>65535 || high<1 || high>65535 || low>high) { - log_fn(LOG_PROTOCOL_WARN, LD_DIR, - "Found bad entry in policy summary %s", escaped(orig_summary)); - return NULL; - } - } else if (tor_sscanf(ent_buf, "%u%c", &low, &dummy) == 1) { - if (low<1 || low>65535) { - log_fn(LOG_PROTOCOL_WARN, LD_DIR, - "Found bad entry in policy summary %s", escaped(orig_summary)); - return NULL; - } - high = low; - } else { - log_fn(LOG_PROTOCOL_WARN, LD_DIR,"Found bad entry in policy summary %s", - escaped(orig_summary)); - return NULL; + if (*next == ',') + ++next; + else if (*next != '\0') + goto bad_ent; + + break; + default: + goto bad_ent; } entries[n_entries].min_port = low; entries[n_entries].max_port = high; n_entries++; + + continue; + skip_ent: + next = strchr(next, ','); + if (!next) + break; + ++next; } if (n_entries == 0) { @@ -2792,6 +2824,11 @@ parse_short_policy(const char *summary) result->n_entries = n_entries; memcpy(result->entries, entries, sizeof(short_policy_entry_t)*n_entries); return result; + + bad_ent: + log_fn(LOG_PROTOCOL_WARN, LD_DIR,"Found bad entry in policy summary %s", + escaped(orig_summary)); + return NULL; } /** Write <b>policy</b> back out into a string. */ |