12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628162916301631163216331634163516361637163816391640164116421643164416451646164716481649165016511652165316541655165616571658165916601661166216631664166516661667166816691670167116721673167416751676167716781679168016811682168316841685168616871688168916901691169216931694169516961697169816991700170117021703 |
- /* Copyright 2001-2004 Roger Dingledine.
- * Copyright 2004-2006 Roger Dingledine, Nick Mathewson. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- const char dirserv_c_id[] =
- "$Id$";
- #include "or.h"
- /**
- * \file dirserv.c
- * \brief Directory server core implementation. Manages directory
- * contents and generates directories.
- **/
- /** How far in the future do we allow a router to get? (seconds) */
- #define ROUTER_ALLOW_SKEW (60*60*12) /* 12 hours */
- /** How many seconds do we wait before regenerating the directory? */
- #define DIR_REGEN_SLACK_TIME 30
- /** If we're a cache, keep this many networkstatuses around from non-trusted
- * directory authorities. */
- #define MAX_UNTRUSTED_NETWORKSTATUSES 16
- extern long stats_n_seconds_working;
- typedef enum {
- FP_NAMED, /**< Listed in fingerprint file. */
- FP_VALID, /**< Unlisted but believed valid. */
- FP_INVALID, /**< Believed invalid. */
- FP_REJECT, /**< We will not publish this router. */
- } router_status_t;
- /** Do we need to regenerate the directory when someone asks for it? */
- static int the_directory_is_dirty = 1;
- static int runningrouters_is_dirty = 1;
- static int the_v2_networkstatus_is_dirty = 1;
- static void directory_remove_invalid(void);
- static int dirserv_regenerate_directory(void);
- static char *format_versions_list(config_line_t *ln);
- /* Should be static; exposed for testing */
- int add_fingerprint_to_dir(const char *nickname, const char *fp,
- smartlist_t *list);
- static int router_is_general_exit(routerinfo_t *ri);
- static router_status_t dirserv_router_get_status(const routerinfo_t *router,
- const char **msg);
- static router_status_t
- dirserv_get_status_impl(const char *fp, const char *nickname,
- const char *address,
- uint32_t addr, uint16_t or_port,
- const char *platform, const char *contact,
- const char **msg, int should_log);
- static int dirserv_thinks_router_is_reachable(routerinfo_t *router,
- time_t now);
- /************** Fingerprint handling code ************/
- static addr_policy_t *authdir_reject_policy = NULL;
- static addr_policy_t *authdir_invalid_policy = NULL;
- /** Parse authdir policy strings from the configuration.
- */
- void
- parse_authdir_policy(void)
- {
- addr_policy_t *n;
- if (authdir_reject_policy) {
- addr_policy_free(authdir_reject_policy);
- authdir_reject_policy = NULL;
- }
- config_parse_addr_policy(get_options()->AuthDirReject,
- &authdir_reject_policy, ADDR_POLICY_REJECT);
- /* ports aren't used. */
- for (n=authdir_reject_policy; n; n = n->next) {
- n->prt_min = 1;
- n->prt_max = 65535;
- }
- if (authdir_invalid_policy) {
- addr_policy_free(authdir_invalid_policy);
- authdir_invalid_policy = NULL;
- }
- config_parse_addr_policy(get_options()->AuthDirInvalid,
- &authdir_invalid_policy, ADDR_POLICY_REJECT);
- /* ports aren't used. */
- for (n=authdir_invalid_policy; n; n = n->next) {
- n->prt_min = 1;
- n->prt_max = 65535;
- }
- }
- /** A member of fingerprint_list: maps a name to a fingerprint.
- **/
- typedef struct fingerprint_entry_t {
- char *nickname; /**< The name of a router (if this fingerprint is bound to a
- * name); the string "!reject" (if this fingerprint should
- * always be rejected); or the string "!invalid" (if this
- * fingerprint should be accepted but never marked as
- * valid. */
- char *fingerprint; /**< Stored as HEX_DIGEST_LEN characters, followed by a
- * NUL */
- } fingerprint_entry_t;
- /** List of nickname-\>identity fingerprint mappings for all the routers
- * that we name. Used to prevent router impersonation. */
- /* Should be static; exposed for testing */
- smartlist_t *fingerprint_list = NULL;
- /** Add the fingerprint <b>fp</b> for the nickname <b>nickname</b> to
- * the smartlist of fingerprint_entry_t's <b>list</b>. Return 0 if it's
- * new, or 1 if we replaced the old value.
- */
- int /* Should be static; exposed for testing */
- add_fingerprint_to_dir(const char *nickname, const char *fp, smartlist_t *list)
- {
- int i;
- fingerprint_entry_t *ent;
- char *fingerprint;
- tor_assert(nickname);
- tor_assert(fp);
- tor_assert(list);
- fingerprint = tor_strdup(fp);
- tor_strstrip(fingerprint, " ");
- if (nickname[0] != '!') {
- for (i = 0; i < smartlist_len(list); ++i) {
- ent = smartlist_get(list, i);
- if (!strcasecmp(ent->nickname,nickname)) {
- tor_free(ent->fingerprint);
- ent->fingerprint = fingerprint;
- return 1;
- }
- }
- }
- ent = tor_malloc(sizeof(fingerprint_entry_t));
- ent->nickname = tor_strdup(nickname);
- ent->fingerprint = fingerprint;
- smartlist_add(list, ent);
- return 0;
- }
- /** Add the nickname and fingerprint for this OR to the
- * global list of recognized identity key fingerprints. */
- int
- dirserv_add_own_fingerprint(const char *nickname, crypto_pk_env_t *pk)
- {
- char fp[FINGERPRINT_LEN+1];
- if (crypto_pk_get_fingerprint(pk, fp, 0)<0) {
- err(LD_BUG, "Error computing fingerprint");
- return -1;
- }
- if (!fingerprint_list)
- fingerprint_list = smartlist_create();
- add_fingerprint_to_dir(nickname, fp, fingerprint_list);
- return 0;
- }
- /** Parse the nickname-\>fingerprint mappings stored in the file named
- * <b>fname</b>. The file format is line-based, with each non-blank
- * holding one nickname, some space, and a fingerprint for that
- * nickname. On success, replace the current fingerprint list with
- * the contents of <b>fname</b> and return 0. On failure, leave the
- * current fingerprint list untouched, and return -1. */
- int
- dirserv_parse_fingerprint_file(const char *fname)
- {
- char *cf;
- char *nickname, *fingerprint;
- smartlist_t *fingerprint_list_new;
- int result;
- config_line_t *front=NULL, *list;
- cf = read_file_to_str(fname, 0);
- if (!cf) {
- warn(LD_FS, "Cannot open fingerprint file %s", fname);
- return -1;
- }
- result = config_get_lines(cf, &front);
- tor_free(cf);
- if (result < 0) {
- warn(LD_CONFIG, "Error reading from fingerprint file");
- return -1;
- }
- fingerprint_list_new = smartlist_create();
- for (list=front; list; list=list->next) {
- nickname = list->key; fingerprint = list->value;
- if (strlen(nickname) > MAX_NICKNAME_LEN) {
- notice(LD_CONFIG,
- "Nickname '%s' too long in fingerprint file. Skipping.", nickname);
- continue;
- }
- if (!is_legal_nickname(nickname) &&
- strcasecmp(nickname, "!reject") &&
- strcasecmp(nickname, "!invalid")) {
- notice(LD_CONFIG,
- "Invalid nickname '%s' in fingerprint file. Skipping.", nickname);
- continue;
- }
- if (strlen(fingerprint) != FINGERPRINT_LEN ||
- !crypto_pk_check_fingerprint_syntax(fingerprint)) {
- notice(LD_CONFIG,
- "Invalid fingerprint (nickname '%s', fingerprint %s). Skipping.",
- nickname, fingerprint);
- continue;
- }
- if (0==strcasecmp(nickname, DEFAULT_CLIENT_NICKNAME)) {
- /* If you approved an OR called "client", then clients who use
- * the default nickname could all be rejected. That's no good. */
- notice(LD_CONFIG,
- "Authorizing a nickname '%s' would break many clients; skipping.",
- DEFAULT_CLIENT_NICKNAME);
- continue;
- }
- if (add_fingerprint_to_dir(nickname, fingerprint, fingerprint_list_new)
- != 0)
- notice(LD_CONFIG, "Duplicate nickname '%s'.", nickname);
- }
- config_free_lines(front);
- dirserv_free_fingerprint_list();
- fingerprint_list = fingerprint_list_new;
- /* Delete any routers whose fingerprints we no longer recognize */
- directory_remove_invalid();
- return 0;
- }
- /** Check whether <b>router</b> has a nickname/identity key combination that
- * we recognize from the fingerprint list, or an IP we automatically act on
- * according to our configuration. Return the appropriate router status.
- *
- * If the status is 'FP_REJECT' and <b>msg</b> is provided, set
- * *<b>msg</b> to an explanation of why. */
- static router_status_t
- dirserv_router_get_status(const routerinfo_t *router, const char **msg)
- {
- char fingerprint[FINGERPRINT_LEN+1];
- if (crypto_pk_get_fingerprint(router->identity_pkey, fingerprint, 0)) {
- warn(LD_BUG,"Error computing fingerprint");
- return -1;
- }
- return dirserv_get_status_impl(fingerprint, router->nickname,
- router->address,
- router->addr, router->or_port,
- router->platform, router->contact_info,
- msg, 1);
- }
- /** Return true if there is no point in downloading the router described by
- * <b>rs</b> because this directory would reject it. */
- int
- dirserv_would_reject_router(routerstatus_t *rs)
- {
- char fp[FINGERPRINT_LEN+1];
- router_status_t res;
- base16_encode(fp, sizeof(fp), rs->identity_digest, DIGEST_LEN);
- res = dirserv_get_status_impl(fp, rs->nickname,
- "", /* address is only used in logs */
- rs->addr, rs->or_port,
- NULL, NULL,
- NULL, 0);
- return (res == FP_REJECT);
- }
- /** Helper: As dirserv_get_router_status, but takes the router fingerprint
- * (hex, no spaces), nickname, address (used for logging only), IP address, OR
- * port, platform (logging only) and contact info (logging only) as arguments.
- *
- * If should_log is false, do not log messages. (There's not much point in
- * logging that we're rejecting servers we'll not download.)
- */
- static router_status_t
- dirserv_get_status_impl(const char *fp, const char *nickname,
- const char *address,
- uint32_t addr, uint16_t or_port,
- const char *platform, const char *contact,
- const char **msg, int should_log)
- {
- fingerprint_entry_t *nn_ent = NULL, *fp_ent = NULL;
- int reject_unlisted = get_options()->AuthDirRejectUnlisted;
- if (!fingerprint_list)
- fingerprint_list = smartlist_create();
- if (should_log)
- debug(LD_DIRSERV, "%d fingerprints known.",
- smartlist_len(fingerprint_list));
- SMARTLIST_FOREACH(fingerprint_list, fingerprint_entry_t *, ent,
- {
- if (!strcasecmp(fp,ent->fingerprint))
- fp_ent = ent;
- if (!strcasecmp(nickname,ent->nickname))
- nn_ent = ent;
- });
- if (fp_ent) {
- if (!strcasecmp(fp_ent->nickname, "!reject")) {
- if (msg)
- *msg = "Fingerprint is marked rejected";
- return FP_REJECT;
- } else if (!strcasecmp(fp_ent->nickname, "!invalid")) {
- if (msg)
- *msg = "Fingerprint is marked invalid";
- return FP_INVALID;
- }
- }
- if (!nn_ent) { /* No such server known with that nickname */
- addr_policy_result_t rej = router_compare_addr_to_addr_policy(
- addr, or_port, authdir_reject_policy);
- addr_policy_result_t inv = router_compare_addr_to_addr_policy(
- addr, or_port, authdir_invalid_policy);
- if (rej == ADDR_POLICY_PROBABLY_REJECTED || rej == ADDR_POLICY_REJECTED) {
- if (should_log)
- info(LD_DIRSERV, "Rejecting '%s' because of address '%s'",
- nickname, address);
- if (msg)
- *msg = "Authdir is rejecting routers in this range.";
- return FP_REJECT;
- }
- if (inv == ADDR_POLICY_PROBABLY_REJECTED || inv == ADDR_POLICY_REJECTED) {
- if (should_log)
- info(LD_DIRSERV, "Not marking '%s' valid because of address '%s'",
- nickname, address);
- return FP_INVALID;
- }
- if (should_log)
- debug(LD_DIRSERV,"No fingerprint found for '%s'",nickname);
- if (!platform || tor_version_as_new_as(platform,"0.1.0.2-rc"))
- return reject_unlisted ? FP_REJECT : FP_VALID;
- else
- return FP_INVALID;
- }
- if (0==strcasecmp(nn_ent->fingerprint, fp)) {
- if (should_log)
- debug(LD_DIRSERV,"Good fingerprint for '%s'",nickname);
- return FP_NAMED; /* Right fingerprint. */
- } else {
- if (should_log)
- warn(LD_DIRSERV,
- "Mismatched fingerprint for '%s': expected '%s' got '%s'. "
- "ContactInfo '%s', platform '%s'.)",
- nickname, nn_ent->fingerprint, fp,
- contact ? contact : "",
- platform ? platform : "");
- if (msg)
- *msg = "Rejected: There is already a verified server with this nickname "
- "and a different fingerprint.";
- return FP_REJECT; /* Wrong fingerprint. */
- }
- }
- /** If we are an authoritative dirserver, and the list of approved
- * servers contains one whose identity key digest is <b>digest</b>,
- * return that router's nickname. Otherwise return NULL. */
- const char *
- dirserv_get_nickname_by_digest(const char *digest)
- {
- char hexdigest[HEX_DIGEST_LEN+1];
- if (!fingerprint_list)
- return NULL;
- tor_assert(digest);
- base16_encode(hexdigest, HEX_DIGEST_LEN+1, digest, DIGEST_LEN);
- SMARTLIST_FOREACH(fingerprint_list, fingerprint_entry_t*, ent,
- { if (!strcasecmp(hexdigest, ent->fingerprint))
- return ent->nickname; } );
- return NULL;
- }
- /** Clear the current fingerprint list. */
- void
- dirserv_free_fingerprint_list(void)
- {
- int i;
- fingerprint_entry_t *ent;
- if (!fingerprint_list)
- return;
- for (i = 0; i < smartlist_len(fingerprint_list); ++i) {
- ent = smartlist_get(fingerprint_list, i);
- tor_free(ent->nickname);
- tor_free(ent->fingerprint);
- tor_free(ent);
- }
- smartlist_free(fingerprint_list);
- fingerprint_list = NULL;
- }
- /*
- * Descriptor list
- */
- /** Return -1 if <b>ri</b> has a private or otherwise bad address,
- * unless we're configured to not care. Return 0 if all ok. */
- static int
- dirserv_router_has_valid_address(routerinfo_t *ri)
- {
- struct in_addr iaddr;
- if (get_options()->DirAllowPrivateAddresses)
- return 0; /* whatever it is, we're fine with it */
- if (!tor_inet_aton(ri->address, &iaddr)) {
- info(LD_DIRSERV,"Router '%s' published non-IP address '%s'. Refusing.",
- ri->nickname, ri->address);
- return -1;
- }
- if (is_internal_IP(ntohl(iaddr.s_addr), 0)) {
- info(LD_DIRSERV,
- "Router '%s' published internal IP address '%s'. Refusing.",
- ri->nickname, ri->address);
- return -1; /* it's a private IP, we should reject it */
- }
- return 0;
- }
- /** Check whether we, as a directory server, want to accept <b>ri</b>. If so,
- * set its is_valid,named,running fields and return 0. Otherwise, return -1.
- *
- * If the router is rejected, set *<b>msg</b> to an explanation of why.
- *
- * If <b>complain</b> then explain at log-level 'notice' why we refused
- * a descriptor; else explain at log-level 'info'.
- */
- int
- authdir_wants_to_reject_router(routerinfo_t *ri, const char **msg,
- int complain)
- {
- /* Okay. Now check whether the fingerprint is recognized. */
- router_status_t status = dirserv_router_get_status(ri, msg);
- time_t now;
- int severity = complain ? LOG_NOTICE : LOG_INFO;
- tor_assert(msg);
- if (status == FP_REJECT)
- return -1; /* msg is already set. */
- /* Is there too much clock skew? */
- now = time(NULL);
- if (ri->cache_info.published_on > now+ROUTER_ALLOW_SKEW) {
- log_fn(severity, LD_DIRSERV, "Publication time for nickname '%s' is too "
- "far (%d minutes) in the future; possible clock skew. Not adding "
- "(ContactInfo '%s', platform '%s').",
- ri->nickname, (int)((ri->cache_info.published_on-now)/60),
- ri->contact_info ? ri->contact_info : "",
- ri->platform ? ri->platform : "");
- *msg = "Rejected: Your clock is set too far in the future, or your "
- "timezone is not correct.";
- return -1;
- }
- if (ri->cache_info.published_on < now-ROUTER_MAX_AGE) {
- log_fn(severity, LD_DIRSERV,
- "Publication time for router with nickname '%s' is too far "
- "(%d minutes) in the past. Not adding (ContactInfo '%s', "
- "platform '%s').",
- ri->nickname, (int)((now-ri->cache_info.published_on)/60),
- ri->contact_info ? ri->contact_info : "",
- ri->platform ? ri->platform : "");
- *msg = "Rejected: Server is expired, or your clock is too far in the past,"
- " or your timezone is not correct.";
- return -1;
- }
- if (dirserv_router_has_valid_address(ri) < 0) {
- log_fn(severity, LD_DIRSERV,
- "Router with nickname '%s' has invalid address '%s'. "
- "Not adding (ContactInfo '%s', platform '%s').",
- ri->nickname, ri->address,
- ri->contact_info ? ri->contact_info : "",
- ri->platform ? ri->platform : "");
- *msg = "Rejected: Address is not an IP, or IP is a private address.";
- return -1;
- }
- /* Okay, looks like we're willing to accept this one. */
- switch (status) {
- case FP_NAMED:
- ri->is_named = ri->is_verified = 1;
- break;
- case FP_VALID:
- ri->is_named = 0;
- ri->is_verified = 1;
- break;
- case FP_INVALID:
- ri->is_named = ri->is_verified = 0;
- break;
- default:
- tor_assert(0);
- }
- return 0;
- }
- /** Parse the server descriptor at <b>desc</b> and maybe insert it into
- * the list of server descriptors. Set *<b>msg</b> to a message that
- * should be passed back to the origin of this descriptor.
- *
- * Return 2 if descriptor is well-formed and accepted;
- * 1 if well-formed and accepted but origin should hear *msg;
- * 0 if well-formed but redundant with one we already have;
- * -1 if it looks vaguely like a router descriptor but rejected;
- * -2 if we can't find a router descriptor in <b>desc</b>.
- */
- int
- dirserv_add_descriptor(const char *desc, const char **msg)
- {
- int r;
- routerinfo_t *ri = NULL, *ri_old = NULL;
- tor_assert(msg);
- *msg = NULL;
- /* Check: is the descriptor syntactically valid? */
- ri = router_parse_entry_from_string(desc, NULL);
- if (!ri) {
- warn(LD_DIRSERV, "Couldn't parse uploaded server descriptor");
- *msg = "Rejected: Couldn't parse server descriptor.";
- return -2;
- }
- /* Check whether this descriptor is semantically identical to the last one
- * from this server. (We do this here and not in router_add_to_routerlist
- * because we want to be able to accept the newest router descriptor that
- * another authority has, so we all converge on the same one.) */
- ri_old = router_get_by_digest(ri->cache_info.identity_digest);
- if (ri_old && ri_old->cache_info.published_on < ri->cache_info.published_on
- && router_differences_are_cosmetic(ri_old, ri)
- && !router_is_me(ri)) {
- info(LD_DIRSERV,
- "Not replacing descriptor from '%s'; differences are cosmetic.",
- ri->nickname);
- *msg = "Not replacing router descriptor; no information has changed since "
- "the last one with this identity.";
- routerinfo_free(ri);
- control_event_or_authdir_new_descriptor("DROPPED", desc, *msg);
- return 0;
- }
- if ((r = router_add_to_routerlist(ri, msg, 0, 0))<0) {
- if (r < -1) /* unless the routerinfo was fine, just out-of-date */
- control_event_or_authdir_new_descriptor("REJECTED", desc, *msg);
- return r == -1 ? 0 : -1;
- } else {
- smartlist_t *changed;
- control_event_or_authdir_new_descriptor("ACCEPTED", desc, *msg);
- changed = smartlist_create();
- smartlist_add(changed, ri);
- control_event_descriptors_changed(changed);
- smartlist_free(changed);
- if (!*msg) {
- *msg = ri->is_verified ? "Verified server descriptor accepted" :
- "Unverified server descriptor accepted";
- }
- return r == 0 ? 2 : 1;
- }
- }
- /** Remove all descriptors whose nicknames or fingerprints no longer
- * are allowed by our fingerprint list. (Descriptors that used to be
- * good can become bad when we reload the fingerprint list.)
- */
- static void
- directory_remove_invalid(void)
- {
- int i;
- int changed = 0;
- routerlist_t *rl = router_get_routerlist();
- for (i = 0; i < smartlist_len(rl->routers); ++i) {
- const char *msg;
- routerinfo_t *ent = smartlist_get(rl->routers, i);
- router_status_t r = dirserv_router_get_status(ent, &msg);
- switch (r) {
- case FP_REJECT:
- info(LD_DIRSERV, "Router '%s' is now rejected: %s",
- ent->nickname, msg?msg:"");
- routerlist_remove(rl, ent, i--, 0);
- changed = 1;
- break;
- case FP_NAMED:
- if (!ent->is_verified || !ent->is_named) {
- info(LD_DIRSERV,
- "Router '%s' is now verified and named.", ent->nickname);
- ent->is_verified = ent->is_named = 1;
- changed = 1;
- }
- break;
- case FP_VALID:
- if (!ent->is_verified || ent->is_named) {
- info(LD_DIRSERV, "Router '%s' is now verified.", ent->nickname);
- ent->is_verified = 1;
- ent->is_named = 0;
- changed = 1;
- }
- break;
- case FP_INVALID:
- if (ent->is_verified || ent->is_named) {
- info(LD_DIRSERV,
- "Router '%s' is no longer verified.", ent->nickname);
- ent->is_verified = ent->is_named = 0;
- changed = 1;
- }
- break;
- }
- }
- if (changed)
- directory_set_dirty();
- }
- /** Write a list of unregistered descriptors into a newly allocated
- * string and return it. Used by dirserv operators to keep track of
- * fast nodes that haven't registered.
- */
- char *
- dirserver_getinfo_unregistered(const char *question)
- {
- router_status_t r;
- smartlist_t *answerlist;
- char buf[1024];
- char *answer;
- int min_bw = atoi(question);
- routerlist_t *rl = router_get_routerlist();
- answerlist = smartlist_create();
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ent, {
- r = dirserv_router_get_status(ent, NULL);
- if (ent->bandwidthcapacity >= (size_t)min_bw &&
- ent->bandwidthrate >= (size_t)min_bw &&
- r != FP_NAMED) {
- /* then log this one */
- tor_snprintf(buf, sizeof(buf),
- "%s: BW %d on '%s'.",
- ent->nickname, ent->bandwidthcapacity,
- ent->platform ? ent->platform : "");
- smartlist_add(answerlist, tor_strdup(buf));
- }
- });
- answer = smartlist_join_strings(answerlist, "\r\n", 0, NULL);
- SMARTLIST_FOREACH(answerlist, char *, cp, tor_free(cp));
- smartlist_free(answerlist);
- return answer;
- }
- /** Mark the directory as <b>dirty</b> -- when we're next asked for a
- * directory, we will rebuild it instead of reusing the most recently
- * generated one.
- */
- void
- directory_set_dirty(void)
- {
- time_t now = time(NULL);
- if (!the_directory_is_dirty)
- the_directory_is_dirty = now;
- if (!runningrouters_is_dirty)
- runningrouters_is_dirty = now;
- if (!the_v2_networkstatus_is_dirty)
- the_v2_networkstatus_is_dirty = now;
- }
- /**
- * Allocate and return a description of the status of the server <b>desc</b>,
- * for use in a router-status line. The server is listed
- * as running iff <b>is_live</b> is true.
- */
- static char *
- list_single_server_status(routerinfo_t *desc, int is_live)
- {
- char buf[MAX_NICKNAME_LEN+HEX_DIGEST_LEN+4]; /* !nickname=$hexdigest\0 */
- char *cp;
- tor_assert(desc);
- cp = buf;
- if (!is_live) {
- *cp++ = '!';
- }
- if (desc->is_verified) {
- strlcpy(cp, desc->nickname, sizeof(buf)-(cp-buf));
- cp += strlen(cp);
- *cp++ = '=';
- }
- *cp++ = '$';
- base16_encode(cp, HEX_DIGEST_LEN+1, desc->cache_info.identity_digest,
- DIGEST_LEN);
- return tor_strdup(buf);
- }
- #define REACHABLE_TIMEOUT (90*60) /* ninety minutes */
- /* Make sure this is at least 3 times the value of get_dir_fetch_period() */
- /** Treat a router as alive if
- * - It's me, and I'm not hibernating.
- * or - we're connected to it and we've found it reachable recently. */
- static int
- dirserv_thinks_router_is_reachable(routerinfo_t *router, time_t now)
- {
- connection_t *conn;
- if (router_is_me(router) && !we_are_hibernating())
- return 1;
- conn = connection_or_get_by_identity_digest(
- router->cache_info.identity_digest);
- if (conn && conn->state == OR_CONN_STATE_OPEN)
- return get_options()->AssumeReachable ||
- now < router->last_reachable + REACHABLE_TIMEOUT;
- return 0;
- }
- /** Return 1 if we're confident that there's a problem with
- * <b>router</b>'s reachability and its operator should be notified.
- */
- int
- dirserv_thinks_router_is_blatantly_unreachable(routerinfo_t *router,
- time_t now)
- {
- connection_t *conn;
- if (router->is_hibernating)
- return 0;
- conn = connection_or_get_by_identity_digest(
- router->cache_info.identity_digest);
- if (conn && conn->state == OR_CONN_STATE_OPEN &&
- now >= router->last_reachable + 2*REACHABLE_TIMEOUT &&
- router->testing_since &&
- now >= router->testing_since + 2*REACHABLE_TIMEOUT)
- return 1;
- return 0;
- }
- /** Based on the routerinfo_ts in <b>routers</b>, allocate the
- * contents of a router-status line, and store it in
- * *<b>router_status_out</b>. Return 0 on success, -1 on failure.
- */
- int
- list_server_status(smartlist_t *routers, char **router_status_out)
- {
- /* List of entries in a router-status style: An optional !, then an optional
- * equals-suffixed nickname, then a dollar-prefixed hexdigest. */
- smartlist_t *rs_entries;
- time_t now = time(NULL);
- time_t cutoff = now - ROUTER_MAX_AGE;
- int authdir_mode = get_options()->AuthoritativeDir;
- tor_assert(router_status_out);
- rs_entries = smartlist_create();
- SMARTLIST_FOREACH(routers, routerinfo_t *, ri,
- {
- if (authdir_mode) {
- /* Update router status in routerinfo_t. */
- ri->is_running = dirserv_thinks_router_is_reachable(ri, now);
- }
- if (ri->cache_info.published_on >= cutoff)
- smartlist_add(rs_entries, list_single_server_status(ri, ri->is_running));
- });
- *router_status_out = smartlist_join_strings(rs_entries, " ", 0, NULL);
- SMARTLIST_FOREACH(rs_entries, char *, cp, tor_free(cp));
- smartlist_free(rs_entries);
- return 0;
- }
- /* Given a (possibly empty) list of config_line_t, each line of which contains
- * a list of comma-separated version numbers surrounded by optional space,
- * allocate and return a new string containing the version numbers, in order,
- * separated by commas. Used to generate Recommended(Client|Server)?Versions
- */
- static char *
- format_versions_list(config_line_t *ln)
- {
- smartlist_t *versions;
- char *result;
- versions = smartlist_create();
- for ( ; ln; ln = ln->next) {
- smartlist_split_string(versions, ln->value, ",",
- SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
- }
- sort_version_list(versions);
- result = smartlist_join_strings(versions,",",0,NULL);
- SMARTLIST_FOREACH(versions,char *,s,tor_free(s));
- smartlist_free(versions);
- return result;
- }
- /** Generate a new directory and write it into a newly allocated string.
- * Point *<b>dir_out</b> to the allocated string. Sign the
- * directory with <b>private_key</b>. Return 0 on success, -1 on
- * failure.
- */
- int
- dirserv_dump_directory_to_string(char **dir_out,
- crypto_pk_env_t *private_key)
- {
- char *cp;
- char *router_status;
- char *identity_pkey; /* Identity key, DER64-encoded. */
- char *recommended_versions;
- char digest[DIGEST_LEN];
- char published[ISO_TIME_LEN+1];
- time_t published_on;
- char *buf = NULL;
- size_t buf_len;
- size_t identity_pkey_len;
- routerlist_t *rl = router_get_routerlist();
- tor_assert(dir_out);
- *dir_out = NULL;
- if (list_server_status(rl->routers, &router_status))
- return -1;
- if (crypto_pk_write_public_key_to_string(private_key,&identity_pkey,
- &identity_pkey_len)<0) {
- warn(LD_BUG,"write identity_pkey to string failed!");
- return -1;
- }
- recommended_versions =
- format_versions_list(get_options()->RecommendedVersions);
- published_on = time(NULL);
- format_iso_time(published, published_on);
- buf_len = 2048+strlen(recommended_versions)+
- strlen(router_status);
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ri,
- buf_len += ri->cache_info.signed_descriptor_len+1);
- buf = tor_malloc(buf_len);
- /* We'll be comparing against buf_len throughout the rest of the
- function, though strictly speaking we shouldn't be able to exceed
- it. This is C, after all, so we may as well check for buffer
- overruns.*/
- tor_snprintf(buf, buf_len,
- "signed-directory\n"
- "published %s\n"
- "recommended-software %s\n"
- "router-status %s\n"
- "dir-signing-key\n%s\n",
- published, recommended_versions, router_status,
- identity_pkey);
- tor_free(recommended_versions);
- tor_free(router_status);
- tor_free(identity_pkey);
- cp = buf + strlen(buf);
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ri,
- {
- size_t len = ri->cache_info.signed_descriptor_len;
- const char *body;
- if (cp+len+1 >= buf+buf_len)
- goto truncated;
- body = signed_descriptor_get_body(&ri->cache_info);
- memcpy(cp, body, len);
- cp += len;
- *cp++ = '\n'; /* add an extra newline in case somebody was depending on
- * it. */
- });
- *cp = '\0';
- /* These multiple strlcat calls are inefficient, but dwarfed by the RSA
- signature. */
- if (strlcat(buf, "directory-signature ", buf_len) >= buf_len)
- goto truncated;
- if (strlcat(buf, get_options()->Nickname, buf_len) >= buf_len)
- goto truncated;
- if (strlcat(buf, "\n", buf_len) >= buf_len)
- goto truncated;
- if (router_get_dir_hash(buf,digest)) {
- warn(LD_BUG,"couldn't compute digest");
- tor_free(buf);
- return -1;
- }
- if (router_append_dirobj_signature(buf,buf_len,digest,private_key)<0) {
- tor_free(buf);
- return -1;
- }
- *dir_out = buf;
- return 0;
- truncated:
- warn(LD_BUG,"tried to exceed string length.");
- tor_free(buf);
- return -1;
- }
- /** Most recently generated encoded signed directory. (auth dirservers only.)*/
- static cached_dir_t the_directory = { NULL, NULL, 0, 0, 0 };
- /* Used only by non-auth dirservers: The directory and runningrouters we'll
- * serve when requested. */
- static cached_dir_t cached_directory = { NULL, NULL, 0, 0, 0 };
- static cached_dir_t cached_runningrouters = { NULL, NULL, 0, 0, 0 };
- /* Used for other dirservers' v2 network statuses. Map from hexdigest to
- * cached_dir_t. */
- static digestmap_t *cached_v2_networkstatus = NULL;
- /** Possibly replace the contents of <b>d</b> with the value of
- * <b>directory</b> published on <b>when</b>, unless <b>when</b> is older than
- * the last value, or too far in the future.
- *
- * Does not copy <b>directory</b>; free it if it isn't used.
- */
- static void
- set_cached_dir(cached_dir_t *d, char *directory, time_t when)
- {
- time_t now = time(NULL);
- if (when<=d->published) {
- info(LD_DIRSERV, "Ignoring old directory; not caching.");
- tor_free(directory);
- } else if (when>=now+ROUTER_MAX_AGE) {
- info(LD_DIRSERV, "Ignoring future directory; not caching.");
- tor_free(directory);
- } else {
- /* if (when>d->published && when<now+ROUTER_MAX_AGE) */
- debug(LD_DIRSERV, "Caching directory.");
- tor_free(d->dir);
- d->dir = directory;
- d->dir_len = strlen(directory);
- tor_free(d->dir_z);
- if (tor_gzip_compress(&(d->dir_z), &(d->dir_z_len), d->dir, d->dir_len,
- ZLIB_METHOD)) {
- warn(LD_BUG,"Error compressing cached directory");
- }
- d->published = when;
- }
- }
- /** Remove all storage held in <b>d</b>, but do not free <b>d</b> itself. */
- static void
- clear_cached_dir(cached_dir_t *d)
- {
- tor_free(d->dir);
- tor_free(d->dir_z);
- memset(d, 0, sizeof(cached_dir_t));
- }
- /** Free all storage held by the cached_dir_t in <b>d</b>. */
- static void
- free_cached_dir(void *_d)
- {
- cached_dir_t *d = (cached_dir_t *)_d;
- clear_cached_dir(d);
- tor_free(d);
- }
- /** If we have no cached directory, or it is older than <b>when</b>, then
- * replace it with <b>directory</b>, published at <b>when</b>.
- */
- void
- dirserv_set_cached_directory(const char *directory, time_t published,
- int is_running_routers)
- {
- cached_dir_t *d;
- d = is_running_routers ? &cached_runningrouters : &cached_directory;
- set_cached_dir(d, tor_strdup(directory), published);
- }
- /** We've just received a v2 network-status for an authoritative directory
- * with identity digest <b>identity</b> published at
- * <b>published</b>. Store it so we can serve it to others. If
- * <b>directory</b> is NULL, remove the entry with the given fingerprint from
- * the cache.
- */
- void
- dirserv_set_cached_networkstatus_v2(const char *networkstatus,
- const char *identity,
- time_t published)
- {
- cached_dir_t *d;
- smartlist_t *trusted_dirs;
- if (!cached_v2_networkstatus)
- cached_v2_networkstatus = digestmap_new();
- if (!(d = digestmap_get(cached_v2_networkstatus, identity))) {
- if (!networkstatus)
- return;
- d = tor_malloc_zero(sizeof(cached_dir_t));
- digestmap_set(cached_v2_networkstatus, identity, d);
- }
- tor_assert(d);
- if (networkstatus) {
- if (published > d->published) {
- set_cached_dir(d, tor_strdup(networkstatus), published);
- }
- } else {
- free_cached_dir(d);
- digestmap_remove(cached_v2_networkstatus, identity);
- }
- router_get_trusted_dir_servers(&trusted_dirs);
- if (digestmap_size(cached_v2_networkstatus) >
- smartlist_len(trusted_dirs) + MAX_UNTRUSTED_NETWORKSTATUSES) {
- /* We need to remove the oldest untrusted networkstatus. */
- const char *oldest = NULL;
- time_t oldest_published = TIME_MAX;
- digestmap_iter_t *iter;
- for (iter = digestmap_iter_init(cached_v2_networkstatus);
- !digestmap_iter_done(iter);
- iter = digestmap_iter_next(cached_v2_networkstatus, iter)) {
- const char *ident;
- void *val;
- digestmap_iter_get(iter, &ident, &val);
- d = val;
- if (d->published < oldest_published &&
- !router_get_trusteddirserver_by_digest(ident)) {
- oldest = ident;
- oldest_published = d->published;
- }
- }
- tor_assert(oldest);
- d = digestmap_remove(cached_v2_networkstatus, oldest);
- if (d)
- free_cached_dir(d);
- }
- }
- /** Helper: If we're an authority for the right directory version (the
- * directory version is determined by <b>is_v1_object</b>), try to regenerate
- * auth_src as appropriate and return it, falling back to cache_src on
- * failure. If we're a cache, return cach_src.
- */
- static cached_dir_t *
- dirserv_pick_cached_dir_obj(cached_dir_t *cache_src,
- cached_dir_t *auth_src,
- time_t dirty, int (*regenerate)(void),
- const char *name,
- int is_v1_object)
- {
- int authority = get_options()->AuthoritativeDir &&
- (!is_v1_object || get_options()->V1AuthoritativeDir);
- if (!authority) {
- return cache_src;
- } else {
- /* We're authoritative. */
- if (regenerate != NULL) {
- if (dirty && dirty + DIR_REGEN_SLACK_TIME < time(NULL)) {
- if (regenerate()) {
- err(LD_BUG, "Couldn't generate %s?", name);
- exit(1);
- }
- } else {
- info(LD_DIRSERV, "The %s is still clean; reusing.", name);
- }
- }
- return auth_src ? auth_src : cache_src;
- }
- }
- /** Helper: If we're authoritative and <b>auth_src</b> is set, use
- * <b>auth_src</b>, otherwise use <b>cache_src</b>. If we're using
- * <b>auth_src</b> and it's been <b>dirty</b> for at least
- * DIR_REGEN_SLACK_TIME seconds, call <b>regenerate</b>() to make a fresh one.
- * Yields the compressed version of the directory object if <b>compress</b> is
- * set; otherwise return the uncompressed version. (In either case, sets
- * *<b>out</b> and returns the size of the buffer in *<b>out</b>.)
- *
- * Use <b>is_v1_object</b> to help determine whether we're authoritative for
- * this kind of object.
- **/
- static size_t
- dirserv_get_obj(const char **out, int compress,
- cached_dir_t *cache_src,
- cached_dir_t *auth_src,
- time_t dirty, int (*regenerate)(void),
- const char *name,
- int is_v1_object)
- {
- cached_dir_t *d = dirserv_pick_cached_dir_obj(
- cache_src, auth_src,
- dirty, regenerate, name, is_v1_object);
- if (!d)
- return 0;
- *out = compress ? d->dir_z : d->dir;
- if (*out) {
- return compress ? d->dir_z_len : d->dir_len;
- } else {
- /* not yet available. */
- return 0;
- }
- }
- /** Set *<b>directory</b> to the most recently generated encoded signed
- * directory, generating a new one as necessary. If not an authoritative
- * directory may return 0 if no directory is yet cached.*/
- size_t
- dirserv_get_directory(const char **directory, int compress)
- {
- return dirserv_get_obj(directory, compress,
- &cached_directory, &the_directory,
- the_directory_is_dirty,
- dirserv_regenerate_directory,
- "server directory", 1);
- }
- /**
- * Generate a fresh directory (authdirservers only.)
- */
- static int
- dirserv_regenerate_directory(void)
- {
- char *new_directory=NULL;
- if (dirserv_dump_directory_to_string(&new_directory,
- get_identity_key())) {
- warn(LD_BUG, "Error creating directory.");
- tor_free(new_directory);
- return -1;
- }
- set_cached_dir(&the_directory, new_directory, time(NULL));
- info(LD_DIRSERV,"New directory (size %d) has been built.",
- (int)the_directory.dir_len);
- debug(LD_DIRSERV,"New directory (size %d):\n%s",(int)the_directory.dir_len,
- the_directory.dir);
- the_directory_is_dirty = 0;
- /* Save the directory to disk so we re-load it quickly on startup.
- */
- dirserv_set_cached_directory(the_directory.dir, time(NULL), 0);
- return 0;
- }
- /** For authoritative directories: the current (v1) network status */
- static cached_dir_t the_runningrouters = { NULL, NULL, 0, 0, 0 };
- /** Replace the current running-routers list with a newly generated one. */
- static int
- generate_runningrouters(void)
- {
- char *s=NULL;
- char *router_status=NULL;
- char digest[DIGEST_LEN];
- char published[ISO_TIME_LEN+1];
- size_t len;
- crypto_pk_env_t *private_key = get_identity_key();
- char *identity_pkey; /* Identity key, DER64-encoded. */
- size_t identity_pkey_len;
- routerlist_t *rl = router_get_routerlist();
- if (list_server_status(rl->routers, &router_status)) {
- goto err;
- }
- if (crypto_pk_write_public_key_to_string(private_key,&identity_pkey,
- &identity_pkey_len)<0) {
- warn(LD_BUG,"write identity_pkey to string failed!");
- goto err;
- }
- format_iso_time(published, time(NULL));
- len = 2048+strlen(router_status);
- s = tor_malloc_zero(len);
- tor_snprintf(s, len,
- "network-status\n"
- "published %s\n"
- "router-status %s\n"
- "dir-signing-key\n%s"
- "directory-signature %s\n",
- published, router_status, identity_pkey,
- get_options()->Nickname);
- tor_free(router_status);
- tor_free(identity_pkey);
- if (router_get_runningrouters_hash(s,digest)) {
- warn(LD_BUG,"couldn't compute digest");
- goto err;
- }
- if (router_append_dirobj_signature(s, len, digest, private_key)<0)
- goto err;
- set_cached_dir(&the_runningrouters, s, time(NULL));
- runningrouters_is_dirty = 0;
- return 0;
- err:
- tor_free(s);
- tor_free(router_status);
- return -1;
- }
- /** Set *<b>rr</b> to the most recently generated encoded signed
- * running-routers list, generating a new one as necessary. Return the
- * size of the directory on success, and 0 on failure. */
- size_t
- dirserv_get_runningrouters(const char **rr, int compress)
- {
- return dirserv_get_obj(rr, compress,
- &cached_runningrouters, &the_runningrouters,
- runningrouters_is_dirty,
- generate_runningrouters,
- "v1 network status list", 1);
- }
- /** Return true iff <b>ri</b> is "useful as an exit node", meaning
- * it allows exit to at least one /8 address space for at least
- * one of ports 80, 443, and 6667. */
- static int
- router_is_general_exit(routerinfo_t *ri)
- {
- static const int ports[] = { 80, 443, 6667 };
- int n_allowed = 0;
- int i;
- for (i = 0; i < 3; ++i) {
- struct addr_policy_t *policy = ri->exit_policy;
- for ( ; policy; policy = policy->next) {
- if (policy->prt_min > ports[i] || policy->prt_max < ports[i])
- continue; /* Doesn't cover our port. */
- if ((policy->msk & 0x00fffffful) != 0)
- continue; /* Narrower than a /8. */
- if ((policy->addr & 0xff000000ul) == 0x7f000000ul)
- continue; /* 127.x */
- /* We have a match that is at least a /8. */
- if (policy->policy_type == ADDR_POLICY_ACCEPT)
- ++n_allowed;
- break;
- }
- }
- return n_allowed > 0;
- }
- /** For authoritative directories: the current (v2) network status */
- static cached_dir_t the_v2_networkstatus = { NULL, NULL, 0, 0, 0 };
- static int
- should_generate_v2_networkstatus(void)
- {
- return get_options()->AuthoritativeDir &&
- the_v2_networkstatus_is_dirty &&
- the_v2_networkstatus_is_dirty + DIR_REGEN_SLACK_TIME < time(NULL);
- }
- long stable_uptime = 0; /* start at a safe value */
- /** Return 1 if <b>router</b> is not suitable for these parameters, else 0.
- * If <b>need_uptime</b> is non-zero, we require a minimum uptime.
- * If <b>need_capacity</b> is non-zero, we require a minimum advertised
- * bandwidth.
- */
- static int
- dirserv_thinks_router_is_unreliable(routerinfo_t *router,
- int need_uptime, int need_capacity)
- {
- if (need_uptime && router->uptime < stable_uptime)
- return 1;
- if (need_capacity &&
- router->bandwidthcapacity < ROUTER_REQUIRED_MIN_BANDWIDTH)
- return 1;
- return 0;
- }
- static int
- _compare_longs(const void **a, const void **b)
- {
- long first = **(long **)a, second = **(long **)b;
- if (first < second) return -1;
- if (first > second) return 1;
- return 0;
- }
- /** Look through the routerlist, and assign the median uptime
- * of running verified servers to stable_uptime. */
- static void
- dirserv_compute_stable_uptime(routerlist_t *rl)
- {
- smartlist_t *uptimes = smartlist_create();
- long *up;
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ri, {
- if (ri->is_running && ri->is_verified) {
- up = tor_malloc(sizeof(long));
- *up = ri->uptime;
- smartlist_add(uptimes, up);
- }
- });
- smartlist_sort(uptimes, _compare_longs);
- stable_uptime = *(long *)smartlist_get(uptimes,
- smartlist_len(uptimes)/2);
- info(LD_DIRSERV, "Uptime cutoff is %ld seconds.", stable_uptime);
- SMARTLIST_FOREACH(uptimes, long *, up, tor_free(up));
- smartlist_free(uptimes);
- }
- /** For authoritative directories only: replace the contents of
- * <b>the_v2_networkstatus</b> with a newly generated network status
- * object. */
- static int
- generate_v2_networkstatus(void)
- {
- #define LONGEST_STATUS_FLAG_NAME_LEN 7
- #define N_STATUS_FLAGS 6
- #define RS_ENTRY_LEN \
- ( /* first line */ \
- MAX_NICKNAME_LEN+BASE64_DIGEST_LEN*2+ISO_TIME_LEN+INET_NTOA_BUF_LEN+ \
- 5*2 /* ports */ + 10 /* punctuation */ + \
- /* second line */ \
- (LONGEST_STATUS_FLAG_NAME_LEN+1)*N_STATUS_FLAGS + 2)
- int r = -1;
- size_t len, identity_pkey_len;
- char *status = NULL, *client_versions = NULL, *server_versions = NULL,
- *identity_pkey = NULL, *hostname = NULL;
- char *outp, *endp;
- or_options_t *options = get_options();
- char fingerprint[FINGERPRINT_LEN+1];
- char ipaddr[INET_NTOA_BUF_LEN+1];
- char published[ISO_TIME_LEN];
- char digest[DIGEST_LEN];
- struct in_addr in;
- uint32_t addr;
- crypto_pk_env_t *private_key = get_identity_key();
- routerlist_t *rl = router_get_routerlist();
- time_t now = time(NULL);
- time_t cutoff = now - ROUTER_MAX_AGE;
- int naming = options->NamingAuthoritativeDir;
- int versioning = options->VersioningAuthoritativeDir;
- const char *contact;
- if (resolve_my_address(options, &addr, &hostname)<0) {
- warn(LD_NET, "Couldn't resolve my hostname");
- goto done;
- }
- in.s_addr = htonl(addr);
- tor_inet_ntoa(&in, ipaddr, sizeof(ipaddr));
- format_iso_time(published, time(NULL));
- client_versions = format_versions_list(options->RecommendedClientVersions);
- server_versions = format_versions_list(options->RecommendedServerVersions);
- if (crypto_pk_write_public_key_to_string(private_key, &identity_pkey,
- &identity_pkey_len)<0) {
- warn(LD_BUG,"Writing public key to string failed.");
- goto done;
- }
- if (crypto_pk_get_fingerprint(private_key, fingerprint, 0)<0) {
- err(LD_BUG, "Error computing fingerprint");
- goto done;
- }
- contact = get_options()->ContactInfo;
- if (!contact)
- contact = "(none)";
- len = 2048+strlen(client_versions)+strlen(server_versions);
- len += identity_pkey_len*2;
- len += (RS_ENTRY_LEN)*smartlist_len(rl->routers);
- status = tor_malloc(len);
- tor_snprintf(status, len,
- "network-status-version 2\n"
- "dir-source %s %s %d\n"
- "fingerprint %s\n"
- "contact %s\n"
- "published %s\n"
- "dir-options%s%s\n"
- "client-versions %s\n"
- "server-versions %s\n"
- "dir-signing-key\n%s\n",
- hostname, ipaddr, (int)options->DirPort,
- fingerprint,
- contact,
- published,
- naming ? " Names" : "",
- versioning ? " Versions" : "",
- client_versions,
- server_versions,
- identity_pkey);
- outp = status + strlen(status);
- endp = status + len;
- /* precompute this part, since we need it to decide what "stable"
- * means. */
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ri, {
- ri->is_running = dirserv_thinks_router_is_reachable(ri, now);
- });
- dirserv_compute_stable_uptime(rl);
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ri, {
- if (ri->cache_info.published_on >= cutoff) {
- int f_exit = router_is_general_exit(ri);
- int f_stable = ri->is_stable =
- !dirserv_thinks_router_is_unreliable(ri, 1, 0);
- int f_fast = ri->is_fast =
- !dirserv_thinks_router_is_unreliable(ri, 0, 1);
- int f_running = ri->is_running; /* computed above */
- int f_authority = router_digest_is_trusted_dir(
- ri->cache_info.identity_digest);
- int f_named = naming && ri->is_named;
- int f_valid = ri->is_verified;
- int f_guard = f_fast && f_stable;
- /* 0.1.1.9-alpha is the first version to support fetch by descriptor
- * hash. */
- int f_v2_dir = ri->dir_port &&
- tor_version_as_new_as(ri->platform,"0.1.1.9-alpha");
- char identity64[BASE64_DIGEST_LEN+1];
- char digest64[BASE64_DIGEST_LEN+1];
- format_iso_time(published, ri->cache_info.published_on);
- digest_to_base64(identity64, ri->cache_info.identity_digest);
- digest_to_base64(digest64, ri->cache_info.signed_descriptor_digest);
- in.s_addr = htonl(ri->addr);
- tor_inet_ntoa(&in, ipaddr, sizeof(ipaddr));
- if (tor_snprintf(outp, endp-outp,
- "r %s %s %s %s %s %d %d\n"
- "s%s%s%s%s%s%s%s%s%s\n",
- ri->nickname,
- identity64,
- digest64,
- published,
- ipaddr,
- ri->or_port,
- ri->dir_port,
- f_authority?" Authority":"",
- f_exit?" Exit":"",
- f_fast?" Fast":"",
- f_guard?" Guard":"",
- f_named?" Named":"",
- f_stable?" Stable":"",
- f_running?" Running":"",
- f_valid?" Valid":"",
- f_v2_dir?" V2Dir":"")<0) {
- warn(LD_BUG, "Unable to print router status.");
- goto done;
- }
- outp += strlen(outp);
- }
- });
- if (tor_snprintf(outp, endp-outp, "directory-signature %s\n",
- get_options()->Nickname)<0) {
- warn(LD_BUG, "Unable to write signature line.");
- goto done;
- }
- if (router_get_networkstatus_v2_hash(status, digest)<0) {
- warn(LD_BUG, "Unable to hash network status");
- goto done;
- }
- if (router_append_dirobj_signature(outp,endp-outp,digest,private_key)<0) {
- warn(LD_BUG, "Unable to sign router status.");
- goto done;
- }
- set_cached_dir(&the_v2_networkstatus, status, time(NULL));
- status = NULL; /* So it doesn't get double-freed. */
- the_v2_networkstatus_is_dirty = 0;
- router_set_networkstatus(the_v2_networkstatus.dir, time(NULL), NS_GENERATED,
- NULL);
- r = 0;
- done:
- tor_free(client_versions);
- tor_free(server_versions);
- tor_free(status);
- tor_free(hostname);
- tor_free(identity_pkey);
- return r;
- }
- /** Look for a network status object as specified by <b>key</b>, which should
- * be either "authority" (to find a network status generated by us), a hex
- * identity digest (to find a network status generated by given directory), or
- * "all" (to return all the v2 network status objects we have, concatenated).
- * If <b>compress</b>, find the version compressed with zlib. Return 0 if
- * nothing was found; otherwise set *<b>directory</b> to the matching network
- * status and return its length.
- */
- int
- dirserv_get_networkstatus_v2(smartlist_t *result,
- const char *key)
- {
- tor_assert(result);
- if (!cached_v2_networkstatus)
- cached_v2_networkstatus = digestmap_new();
- if (!(strcmp(key,"authority"))) {
- if (get_options()->AuthoritativeDir) {
- cached_dir_t *d =
- dirserv_pick_cached_dir_obj(NULL,
- &the_v2_networkstatus,
- the_v2_networkstatus_is_dirty,
- generate_v2_networkstatus,
- "network status list", 0);
- if (d)
- smartlist_add(result, d);
- else
- warn(LD_BUG,"Unable to generate an authoritative network status.");
- }
- } else if (!strcmp(key, "all")) {
- digestmap_iter_t *iter;
- if (should_generate_v2_networkstatus())
- generate_v2_networkstatus();
- iter = digestmap_iter_init(cached_v2_networkstatus);
- while (!digestmap_iter_done(iter)) {
- const char *ident;
- void *val;
- digestmap_iter_get(iter, &ident, &val);
- smartlist_add(result, val);
- iter = digestmap_iter_next(cached_v2_networkstatus, iter);
- }
- if (smartlist_len(result) == 0)
- warn(LD_DIRSERV,
- "Client requested 'all' network status objects; we have none.");
- } else if (!strcmpstart(key, "fp/")) {
- smartlist_t *digests = smartlist_create();
- dir_split_resource_into_fingerprints(key+3, digests, NULL, 1);
- SMARTLIST_FOREACH(digests, char *, cp,
- {
- cached_dir_t *cached;
- if (router_digest_is_me(cp) && should_generate_v2_networkstatus())
- generate_v2_networkstatus();
- cached = digestmap_get(cached_v2_networkstatus, cp);
- if (cached) {
- smartlist_add(result, cached);
- } else {
- char hexbuf[HEX_DIGEST_LEN+1];
- base16_encode(hexbuf, sizeof(hexbuf), cp, DIGEST_LEN);
- info(LD_DIRSERV, "Don't know about any network status with "
- "fingerprint '%s'", hexbuf);
- }
- tor_free(cp);
- });
- smartlist_free(digests);
- }
- return 0;
- }
- /** Add a signed_descriptor_t to <b>descs_out</b> for each router matching
- * <b>key</b>. The key should be either
- * - "/tor/server/authority" for our own routerinfo;
- * - "/tor/server/all" for all the routerinfos we have, concatenated;
- * - "/tor/server/fp/FP" where FP is a plus-separated sequence of
- * hex identity digests; or
- * - "/tor/server/d/D" where D is a plus-separated sequence
- * of server descriptor digests, in hex.
- *
- * Return 0 if we found some matching descriptors, or -1 if we do not
- * have any descriptors, no matching descriptors, or if we did not
- * recognize the key (URL).
- * If -1 is returned *<b>msg</b> will be set to an appropriate error
- * message.
- */
- int
- dirserv_get_routerdescs(smartlist_t *descs_out, const char *key,
- const char **msg)
- {
- *msg = NULL;
- if (!strcmp(key, "/tor/server/all")) {
- routerlist_t *rl = router_get_routerlist();
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r,
- smartlist_add(descs_out, &(r->cache_info)));
- } else if (!strcmp(key, "/tor/server/authority")) {
- routerinfo_t *ri = router_get_my_routerinfo();
- if (ri)
- smartlist_add(descs_out, &(ri->cache_info));
- } else if (!strcmpstart(key, "/tor/server/d/")) {
- smartlist_t *digests = smartlist_create();
- key += strlen("/tor/server/d/");
- dir_split_resource_into_fingerprints(key, digests, NULL, 1);
- SMARTLIST_FOREACH(digests, const char *, d,
- {
- signed_descriptor_t *sd = router_get_by_descriptor_digest(d);
- if (sd)
- smartlist_add(descs_out,sd);
- });
- SMARTLIST_FOREACH(digests, char *, d, tor_free(d));
- smartlist_free(digests);
- } else if (!strcmpstart(key, "/tor/server/fp/")) {
- smartlist_t *digests = smartlist_create();
- time_t cutoff = time(NULL) - ROUTER_MAX_AGE;
- key += strlen("/tor/server/fp/");
- dir_split_resource_into_fingerprints(key, digests, NULL, 1);
- SMARTLIST_FOREACH(digests, const char *, d,
- {
- if (router_digest_is_me(d)) {
- smartlist_add(descs_out, &(router_get_my_routerinfo()->cache_info));
- } else {
- routerinfo_t *ri = router_get_by_digest(d);
- /* Don't actually serve a descriptor that everyone will think is
- * expired. This is an (ugly) workaround to keep buggy 0.1.1.10
- * Tors from downloading descriptors that they will throw away.
- */
- if (ri && ri->cache_info.published_on > cutoff)
- smartlist_add(descs_out, &(ri->cache_info));
- }
- });
- SMARTLIST_FOREACH(digests, char *, d, tor_free(d));
- smartlist_free(digests);
- } else {
- *msg = "Key not recognized";
- return -1;
- }
- if (!smartlist_len(descs_out)) {
- *msg = "Servers unavailable";
- return -1;
- }
- return 0;
- }
- /** Called when a TLS handshake has completed successfully with a
- * router listening at <b>address</b>:<b>or_port</b>, and has yielded
- * a certificate with digest <b>digest_rcvd</b> and nickname
- * <b>nickname_rcvd</b>. When this happens, it's clear that any other
- * descriptors for that address/port combination must be unusable:
- * delete them if they are not verified.
- *
- * Also, if as_advertised is 1, then inform the reachability checker
- * that we could get to this guy.
- */
- void
- dirserv_orconn_tls_done(const char *address,
- uint16_t or_port,
- const char *digest_rcvd,
- const char *nickname_rcvd,
- int as_advertised)
- {
- int i;
- routerlist_t *rl = router_get_routerlist();
- tor_assert(address);
- tor_assert(digest_rcvd);
- tor_assert(nickname_rcvd);
- // XXXXNM We should really have a better solution here than dropping
- // XXXXNM whole routers; otherwise, they come back way too easily.
- for (i = 0; i < smartlist_len(rl->routers); ++i) {
- routerinfo_t *ri = smartlist_get(rl->routers, i);
- int drop = 0;
- if (strcasecmp(address, ri->address) || or_port != ri->or_port)
- continue;
- if (!ri->is_verified) {
- /* We have a router at the same address! */
- if (strcasecmp(ri->nickname, nickname_rcvd)) {
- notice(LD_DIRSERV, "Dropping descriptor: nickname '%s' does not match "
- "nickname '%s' in cert from %s:%d",
- ri->nickname, nickname_rcvd, address, or_port);
- drop = 1;
- } else if (memcmp(ri->cache_info.identity_digest, digest_rcvd,
- DIGEST_LEN)) {
- notice(LD_DIRSERV, "Dropping descriptor: identity key does not match "
- "key in cert from %s:%d",
- address, or_port);
- drop = 1;
- }
- }
- if (drop) {
- routerlist_remove(rl, ri, i--, 0);
- directory_set_dirty();
- } else { /* correct nickname and digest. mark this router reachable! */
- info(LD_DIRSERV,"Found router %s to be reachable. Yay.", ri->nickname);
- ri->last_reachable = time(NULL);
- ri->num_unreachable_notifications = 0;
- }
- }
- }
- /** Release all storage used by the directory server. */
- void
- dirserv_free_all(void)
- {
- if (fingerprint_list) {
- SMARTLIST_FOREACH(fingerprint_list, fingerprint_entry_t*, fp,
- { tor_free(fp->nickname);
- tor_free(fp->fingerprint);
- tor_free(fp); });
- smartlist_free(fingerprint_list);
- fingerprint_list = NULL;
- }
- if (authdir_reject_policy)
- addr_policy_free(authdir_reject_policy);
- if (authdir_invalid_policy)
- addr_policy_free(authdir_invalid_policy);
- clear_cached_dir(&the_directory);
- clear_cached_dir(&the_runningrouters);
- clear_cached_dir(&the_v2_networkstatus);
- clear_cached_dir(&cached_directory);
- clear_cached_dir(&cached_runningrouters);
- if (cached_v2_networkstatus) {
- digestmap_free(cached_v2_networkstatus, free_cached_dir);
- cached_v2_networkstatus = NULL;
- }
- }
|