diff options
Diffstat (limited to 'src/or/nodelist.c')
| -rw-r--r-- | src/or/nodelist.c | 160 |
1 files changed, 130 insertions, 30 deletions
diff --git a/src/or/nodelist.c b/src/or/nodelist.c index 26f990b08c..aaec39f7b8 100644 --- a/src/or/nodelist.c +++ b/src/or/nodelist.c @@ -1,7 +1,7 @@ /* 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. */ + * Copyright (c) 2007-2017, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** @@ -10,6 +10,32 @@ * \brief Structures and functions for tracking what we know about the routers * on the Tor network, and correlating information from networkstatus, * routerinfo, and microdescs. + * + * The key structure here is node_t: that's the canonical way to refer + * to a Tor relay that we might want to build a circuit through. Every + * node_t has either a routerinfo_t, or a routerstatus_t from the current + * networkstatus consensus. If it has a routerstatus_t, it will also + * need to have a microdesc_t before you can use it for circuits. + * + * The nodelist_t is a global singleton that maps identities to node_t + * objects. Access them with the node_get_*() functions. The nodelist_t + * is maintained by calls throughout the codebase + * + * Generally, other code should not have to reach inside a node_t to + * see what information it has. Instead, you should call one of the + * many accessor functions that works on a generic node_t. If there + * isn't one that does what you need, it's better to make such a function, + * and then use it. + * + * For historical reasons, some of the functions that select a node_t + * from the list of all usable node_t objects are in the routerlist.c + * module, since they originally selected a routerinfo_t. (TODO: They + * should move!) + * + * (TODO: Perhaps someday we should abstract the remaining ways of + * talking about a relay to also be node_t instances. Those would be + * routerstatus_t as used for directory requests, and dir_server_t as + * used for authorities and fallback directories.) */ #include "or.h" @@ -18,16 +44,19 @@ #include "config.h" #include "control.h" #include "dirserv.h" +#include "entrynodes.h" #include "geoip.h" #include "main.h" #include "microdesc.h" #include "networkstatus.h" #include "nodelist.h" #include "policies.h" +#include "protover.h" #include "rendservice.h" #include "router.h" #include "routerlist.h" #include "routerset.h" +#include "torcert.h" #include <string.h> @@ -46,7 +75,6 @@ static void count_usable_descriptors(int *num_present, int *num_usable, smartlist_t *descs_out, const networkstatus_t *consensus, - const or_options_t *options, time_t now, routerset_t *in_set, usable_descriptor_t exit_only); @@ -697,6 +725,73 @@ node_get_by_nickname,(const char *nickname, int warn_if_unnamed)) } } +/** Return the Ed25519 identity key for the provided node, or NULL if it + * doesn't have one. */ +const ed25519_public_key_t * +node_get_ed25519_id(const node_t *node) +{ + if (node->ri) { + if (node->ri->cache_info.signing_key_cert) { + const ed25519_public_key_t *pk = + &node->ri->cache_info.signing_key_cert->signing_key; + if (BUG(ed25519_public_key_is_zero(pk))) + goto try_the_md; + return pk; + } + } + try_the_md: + if (node->md) { + if (node->md->ed25519_identity_pkey) { + return node->md->ed25519_identity_pkey; + } + } + return NULL; +} + +/** Return true iff this node's Ed25519 identity matches <b>id</b>. + * (An absent Ed25519 identity matches NULL or zero.) */ +int +node_ed25519_id_matches(const node_t *node, const ed25519_public_key_t *id) +{ + const ed25519_public_key_t *node_id = node_get_ed25519_id(node); + if (node_id == NULL || ed25519_public_key_is_zero(node_id)) { + return id == NULL || ed25519_public_key_is_zero(id); + } else { + return id && ed25519_pubkey_eq(node_id, id); + } +} + +/** Return true iff <b>node</b> supports authenticating itself + * by ed25519 ID during the link handshake in a way that we can understand + * when we probe it. */ +int +node_supports_ed25519_link_authentication(const node_t *node) +{ + /* XXXX Oh hm. What if some day in the future there are link handshake + * versions that aren't 3 but which are ed25519 */ + if (! node_get_ed25519_id(node)) + return 0; + if (node->ri) { + const char *protos = node->ri->protocol_list; + if (protos == NULL) + return 0; + return protocol_list_supports_protocol(protos, PRT_LINKAUTH, 3); + } + if (node->rs) { + return node->rs->supports_ed25519_link_handshake; + } + tor_assert_nonfatal_unreached_once(); + return 0; +} + +/** Return the RSA ID key's SHA1 digest for the provided node. */ +const uint8_t * +node_get_rsa_id_digest(const node_t *node) +{ + tor_assert(node); + return (const uint8_t*)node->identity; +} + /** Return the nickname of <b>node</b>, or NULL if we can't find one. */ const char * node_get_nickname(const node_t *node) @@ -992,16 +1087,6 @@ node_get_platform(const node_t *node) return NULL; } -/** Return <b>node</b>'s time of publication, or 0 if we don't have one. */ -time_t -node_get_published_on(const node_t *node) -{ - if (node->ri) - return node->ri->cache_info.published_on; - else - return 0; -} - /** Return true iff <b>node</b> is one representing this router. */ int node_is_me(const node_t *node) @@ -1146,9 +1231,11 @@ node_get_pref_ipv6_orport(const node_t *node, tor_addr_port_t *ap_out) node_assert_ok(node); tor_assert(ap_out); - /* Prefer routerstatus over microdesc for consistency with the - * fascist_firewall_* functions. Also check if the address or port are valid, - * and try another alternative if they are not. */ + /* Check ri first, because rewrite_node_address_for_bridge() updates + * node->ri with the configured bridge address. + * Prefer rs over md for consistency with the fascist_firewall_* functions. + * Check if the address or port are valid, and try another alternative + * if they are not. */ if (node->ri && tor_addr_port_is_valid(&node->ri->ipv6_addr, node->ri->ipv6_orport, 0)) { @@ -1208,6 +1295,9 @@ node_get_prim_dirport(const node_t *node, tor_addr_port_t *ap_out) node_assert_ok(node); tor_assert(ap_out); + /* Check ri first, because rewrite_node_address_for_bridge() updates + * node->ri with the configured bridge address. */ + RETURN_IPV4_AP(node->ri, dir_port, ap_out); RETURN_IPV4_AP(node->rs, dir_port, ap_out); /* Microdescriptors only have an IPv6 address */ @@ -1240,8 +1330,11 @@ node_get_pref_ipv6_dirport(const node_t *node, tor_addr_port_t *ap_out) node_assert_ok(node); tor_assert(ap_out); - /* Check if the address or port are valid, and try another alternative if - * they are not. Note that microdescriptors have no dir_port. */ + /* Check ri first, because rewrite_node_address_for_bridge() updates + * node->ri with the configured bridge address. + * Prefer rs over md for consistency with the fascist_firewall_* functions. + * Check if the address or port are valid, and try another alternative + * if they are not. */ /* Assume IPv4 and IPv6 dirports are the same */ if (node->ri && tor_addr_port_is_valid(&node->ri->ipv6_addr, @@ -1321,7 +1414,7 @@ nodelist_refresh_countries(void) /** Return true iff router1 and router2 have similar enough network addresses * that we should treat them as being in the same family */ -static inline int +int addrs_in_same_network_family(const tor_addr_t *a1, const tor_addr_t *a2) { @@ -1628,8 +1721,8 @@ router_have_minimum_dir_info(void) * this can cause router_have_consensus_path() to be set to * CONSENSUS_PATH_EXIT, even if there are no nodes with accept exit policies. */ -consensus_path_type_t -router_have_consensus_path(void) +MOCK_IMPL(consensus_path_type_t, +router_have_consensus_path, (void)) { return have_consensus_path; } @@ -1668,7 +1761,7 @@ static void count_usable_descriptors(int *num_present, int *num_usable, smartlist_t *descs_out, const networkstatus_t *consensus, - const or_options_t *options, time_t now, + time_t now, routerset_t *in_set, usable_descriptor_t exit_only) { @@ -1685,7 +1778,7 @@ count_usable_descriptors(int *num_present, int *num_usable, continue; if (in_set && ! routerset_contains_routerstatus(in_set, rs, -1)) continue; - if (client_would_use_router(rs, now, options)) { + if (client_would_use_router(rs, now)) { const char * const digest = rs->descriptor_digest; int present; ++*num_usable; /* the consensus says we want it. */ @@ -1718,9 +1811,9 @@ count_usable_descriptors(int *num_present, int *num_usable, * If **<b>status_out</b> is present, allocate a new string and print the * available percentages of guard, middle, and exit nodes to it, noting * whether there are exits in the consensus. - * If there are no guards in the consensus, - * we treat the exit fraction as 100%. - */ + * If there are no exits in the consensus, we treat the exit fraction as 100%, + * but set router_have_consensus_path() so that we can only build internal + * paths. */ static double compute_frac_paths_available(const networkstatus_t *consensus, const or_options_t *options, time_t now, @@ -1739,10 +1832,10 @@ compute_frac_paths_available(const networkstatus_t *consensus, const int authdir = authdir_mode_v3(options); count_usable_descriptors(num_present_out, num_usable_out, - mid, consensus, options, now, NULL, + mid, consensus, now, NULL, USABLE_DESCRIPTOR_ALL); if (options->EntryNodes) { - count_usable_descriptors(&np, &nu, guards, consensus, options, now, + count_usable_descriptors(&np, &nu, guards, consensus, now, options->EntryNodes, USABLE_DESCRIPTOR_ALL); } else { SMARTLIST_FOREACH(mid, const node_t *, node, { @@ -1763,7 +1856,7 @@ compute_frac_paths_available(const networkstatus_t *consensus, * an unavoidable feature of forcing authorities to declare * certain nodes as exits. */ - count_usable_descriptors(&np, &nu, exits, consensus, options, now, + count_usable_descriptors(&np, &nu, exits, consensus, now, NULL, USABLE_DESCRIPTOR_EXIT_ONLY); log_debug(LD_NET, "%s: %d present, %d usable", @@ -1812,7 +1905,7 @@ compute_frac_paths_available(const networkstatus_t *consensus, smartlist_t *myexits_unflagged = smartlist_new(); /* All nodes with exit flag in ExitNodes option */ - count_usable_descriptors(&np, &nu, myexits, consensus, options, now, + count_usable_descriptors(&np, &nu, myexits, consensus, now, options->ExitNodes, USABLE_DESCRIPTOR_EXIT_ONLY); log_debug(LD_NET, "%s: %d present, %d usable", @@ -1823,7 +1916,7 @@ compute_frac_paths_available(const networkstatus_t *consensus, /* Now compute the nodes in the ExitNodes option where which we don't know * what their exit policy is, or we know it permits something. */ count_usable_descriptors(&np, &nu, myexits_unflagged, - consensus, options, now, + consensus, now, options->ExitNodes, USABLE_DESCRIPTOR_ALL); log_debug(LD_NET, "%s: %d present, %d usable", @@ -1970,6 +2063,13 @@ update_router_have_minimum_dir_info(void) using_md = consensus->flavor == FLAV_MICRODESC; + if (! entry_guards_have_enough_dir_info_to_build_circuits()) { + strlcpy(dir_info_status, "We're missing descriptors for some of our " + "primary entry guards", sizeof(dir_info_status)); + res = 0; + goto done; + } + /* Check fraction of available paths */ { char *status = NULL; |