/
routerlist.c
5211 lines (4651 loc) · 176 KB
/
routerlist.c
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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2015, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file routerlist.c
* \brief Code to
* maintain and access the global list of routerinfos for known
* servers.
**/
#define ROUTERLIST_PRIVATE
#include "or.h"
#include "crypto_ed25519.h"
#include "circuitstats.h"
#include "config.h"
#include "connection.h"
#include "control.h"
#include "directory.h"
#include "dirserv.h"
#include "dirvote.h"
#include "entrynodes.h"
#include "fp_pair.h"
#include "geoip.h"
#include "hibernate.h"
#include "main.h"
#include "microdesc.h"
#include "networkstatus.h"
#include "nodelist.h"
#include "policies.h"
#include "reasons.h"
#include "rendcommon.h"
#include "rendservice.h"
#include "rephist.h"
#include "router.h"
#include "routerlist.h"
#include "routerparse.h"
#include "routerset.h"
#include "sandbox.h"
#include "torcert.h"
// #define DEBUG_ROUTERLIST
/****************************************************************************/
DECLARE_TYPED_DIGESTMAP_FNS(sdmap_, digest_sd_map_t, signed_descriptor_t)
DECLARE_TYPED_DIGESTMAP_FNS(rimap_, digest_ri_map_t, routerinfo_t)
DECLARE_TYPED_DIGESTMAP_FNS(eimap_, digest_ei_map_t, extrainfo_t)
DECLARE_TYPED_DIGESTMAP_FNS(dsmap_, digest_ds_map_t, download_status_t)
#define SDMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(sdmap_to_digestmap(map), keyvar, signed_descriptor_t *, \
valvar)
#define RIMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(rimap_to_digestmap(map), keyvar, routerinfo_t *, valvar)
#define EIMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(eimap_to_digestmap(map), keyvar, extrainfo_t *, valvar)
#define DSMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(dsmap_to_digestmap(map), keyvar, download_status_t *, \
valvar)
/* Forward declaration for cert_list_t */
typedef struct cert_list_t cert_list_t;
/* static function prototypes */
static int compute_weighted_bandwidths(const smartlist_t *sl,
bandwidth_weight_rule_t rule,
u64_dbl_t **bandwidths_out);
static const routerstatus_t *router_pick_directory_server_impl(
dirinfo_type_t auth, int flags, int *n_busy_out);
static const routerstatus_t *router_pick_trusteddirserver_impl(
const smartlist_t *sourcelist, dirinfo_type_t auth,
int flags, int *n_busy_out);
static const routerstatus_t *router_pick_dirserver_generic(
smartlist_t *sourcelist,
dirinfo_type_t type, int flags);
static void mark_all_dirservers_up(smartlist_t *server_list);
static void dir_server_free(dir_server_t *ds);
static int signed_desc_digest_is_recognized(signed_descriptor_t *desc);
static const char *signed_descriptor_get_body_impl(
const signed_descriptor_t *desc,
int with_annotations);
static void list_pending_downloads(digestmap_t *result,
digest256map_t *result256,
int purpose, const char *prefix);
static void list_pending_fpsk_downloads(fp_pair_map_t *result);
static void launch_dummy_descriptor_download_as_needed(time_t now,
const or_options_t *options);
static void download_status_reset_by_sk_in_cl(cert_list_t *cl,
const char *digest);
static int download_status_is_ready_by_sk_in_cl(cert_list_t *cl,
const char *digest,
time_t now, int max_failures);
/****************************************************************************/
/** Global list of a dir_server_t object for each directory
* authority. */
static smartlist_t *trusted_dir_servers = NULL;
/** Global list of dir_server_t objects for all directory authorities
* and all fallback directory servers. */
static smartlist_t *fallback_dir_servers = NULL;
/** List of certificates for a single authority, and download status for
* latest certificate.
*/
struct cert_list_t {
/*
* The keys of download status map are cert->signing_key_digest for pending
* downloads by (identity digest/signing key digest) pair; functions such
* as authority_cert_get_by_digest() already assume these are unique.
*/
struct digest_ds_map_t *dl_status_map;
/* There is also a dlstatus for the download by identity key only */
download_status_t dl_status_by_id;
smartlist_t *certs;
};
/** Map from v3 identity key digest to cert_list_t. */
static digestmap_t *trusted_dir_certs = NULL;
/** True iff any key certificate in at least one member of
* <b>trusted_dir_certs</b> has changed since we last flushed the
* certificates to disk. */
static int trusted_dir_servers_certs_changed = 0;
/** Global list of all of the routers that we know about. */
static routerlist_t *routerlist = NULL;
/** List of strings for nicknames we've already warned about and that are
* still unknown / unavailable. */
static smartlist_t *warned_nicknames = NULL;
/** The last time we tried to download any routerdesc, or 0 for "never". We
* use this to rate-limit download attempts when the number of routerdescs to
* download is low. */
static time_t last_descriptor_download_attempted = 0;
/** Return the number of directory authorities whose type matches some bit set
* in <b>type</b> */
int
get_n_authorities(dirinfo_type_t type)
{
int n = 0;
if (!trusted_dir_servers)
return 0;
SMARTLIST_FOREACH(trusted_dir_servers, dir_server_t *, ds,
if (ds->type & type)
++n);
return n;
}
/** Reset the download status of a specified element in a dsmap */
static void
download_status_reset_by_sk_in_cl(cert_list_t *cl, const char *digest)
{
download_status_t *dlstatus = NULL;
tor_assert(cl);
tor_assert(digest);
/* Make sure we have a dsmap */
if (!(cl->dl_status_map)) {
cl->dl_status_map = dsmap_new();
}
/* Look for a download_status_t in the map with this digest */
dlstatus = dsmap_get(cl->dl_status_map, digest);
/* Got one? */
if (!dlstatus) {
/* Insert before we reset */
dlstatus = tor_malloc_zero(sizeof(*dlstatus));
dsmap_set(cl->dl_status_map, digest, dlstatus);
}
tor_assert(dlstatus);
/* Go ahead and reset it */
download_status_reset(dlstatus);
}
/**
* Return true if the download for this signing key digest in cl is ready
* to be re-attempted.
*/
static int
download_status_is_ready_by_sk_in_cl(cert_list_t *cl,
const char *digest,
time_t now, int max_failures)
{
int rv = 0;
download_status_t *dlstatus = NULL;
tor_assert(cl);
tor_assert(digest);
/* Make sure we have a dsmap */
if (!(cl->dl_status_map)) {
cl->dl_status_map = dsmap_new();
}
/* Look for a download_status_t in the map with this digest */
dlstatus = dsmap_get(cl->dl_status_map, digest);
/* Got one? */
if (dlstatus) {
/* Use download_status_is_ready() */
rv = download_status_is_ready(dlstatus, now, max_failures);
} else {
/*
* If we don't know anything about it, return 1, since we haven't
* tried this one before. We need to create a new entry here,
* too.
*/
dlstatus = tor_malloc_zero(sizeof(*dlstatus));
download_status_reset(dlstatus);
dsmap_set(cl->dl_status_map, digest, dlstatus);
rv = 1;
}
return rv;
}
/** Helper: Return the cert_list_t for an authority whose authority ID is
* <b>id_digest</b>, allocating a new list if necessary. */
static cert_list_t *
get_cert_list(const char *id_digest)
{
cert_list_t *cl;
if (!trusted_dir_certs)
trusted_dir_certs = digestmap_new();
cl = digestmap_get(trusted_dir_certs, id_digest);
if (!cl) {
cl = tor_malloc_zero(sizeof(cert_list_t));
cl->dl_status_by_id.schedule = DL_SCHED_CONSENSUS;
cl->certs = smartlist_new();
cl->dl_status_map = dsmap_new();
digestmap_set(trusted_dir_certs, id_digest, cl);
}
return cl;
}
/** Release all space held by a cert_list_t */
static void
cert_list_free(cert_list_t *cl)
{
if (!cl)
return;
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
authority_cert_free(cert));
smartlist_free(cl->certs);
dsmap_free(cl->dl_status_map, tor_free_);
tor_free(cl);
}
/** Wrapper for cert_list_free so we can pass it to digestmap_free */
static void
cert_list_free_(void *cl)
{
cert_list_free(cl);
}
/** Reload the cached v3 key certificates from the cached-certs file in
* the data directory. Return 0 on success, -1 on failure. */
int
trusted_dirs_reload_certs(void)
{
char *filename;
char *contents;
int r;
filename = get_datadir_fname("cached-certs");
contents = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL);
tor_free(filename);
if (!contents)
return 0;
r = trusted_dirs_load_certs_from_string(
contents,
TRUSTED_DIRS_CERTS_SRC_FROM_STORE, 1);
tor_free(contents);
return r;
}
/** Helper: return true iff we already have loaded the exact cert
* <b>cert</b>. */
static INLINE int
already_have_cert(authority_cert_t *cert)
{
cert_list_t *cl = get_cert_list(cert->cache_info.identity_digest);
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, c,
{
if (tor_memeq(c->cache_info.signed_descriptor_digest,
cert->cache_info.signed_descriptor_digest,
DIGEST_LEN))
return 1;
});
return 0;
}
/** Load a bunch of new key certificates from the string <b>contents</b>. If
* <b>source</b> is TRUSTED_DIRS_CERTS_SRC_FROM_STORE, the certificates are
* from the cache, and we don't need to flush them to disk. If we are a
* dirauth loading our own cert, source is TRUSTED_DIRS_CERTS_SRC_SELF.
* Otherwise, source is download type: TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST
* or TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST. If <b>flush</b> is true, we
* need to flush any changed certificates to disk now. Return 0 on success,
* -1 if any certs fail to parse.
*/
int
trusted_dirs_load_certs_from_string(const char *contents, int source,
int flush)
{
dir_server_t *ds;
const char *s, *eos;
int failure_code = 0;
int from_store = (source == TRUSTED_DIRS_CERTS_SRC_FROM_STORE);
for (s = contents; *s; s = eos) {
authority_cert_t *cert = authority_cert_parse_from_string(s, &eos);
cert_list_t *cl;
if (!cert) {
failure_code = -1;
break;
}
ds = trusteddirserver_get_by_v3_auth_digest(
cert->cache_info.identity_digest);
log_debug(LD_DIR, "Parsed certificate for %s",
ds ? ds->nickname : "unknown authority");
if (already_have_cert(cert)) {
/* we already have this one. continue. */
log_info(LD_DIR, "Skipping %s certificate for %s that we "
"already have.",
from_store ? "cached" : "downloaded",
ds ? ds->nickname : "an old or new authority");
/*
* A duplicate on download should be treated as a failure, so we call
* authority_cert_dl_failed() to reset the download status to make sure
* we can't try again. Since we've implemented the fp-sk mechanism
* to download certs by signing key, this should be much rarer than it
* was and is perhaps cause for concern.
*/
if (!from_store) {
if (authdir_mode(get_options())) {
log_warn(LD_DIR,
"Got a certificate for %s, but we already have it. "
"Maybe they haven't updated it. Waiting for a while.",
ds ? ds->nickname : "an old or new authority");
} else {
log_info(LD_DIR,
"Got a certificate for %s, but we already have it. "
"Maybe they haven't updated it. Waiting for a while.",
ds ? ds->nickname : "an old or new authority");
}
/*
* This is where we care about the source; authority_cert_dl_failed()
* needs to know whether the download was by fp or (fp,sk) pair to
* twiddle the right bit in the download map.
*/
if (source == TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST) {
authority_cert_dl_failed(cert->cache_info.identity_digest,
NULL, 404);
} else if (source == TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST) {
authority_cert_dl_failed(cert->cache_info.identity_digest,
cert->signing_key_digest, 404);
}
}
authority_cert_free(cert);
continue;
}
if (ds) {
log_info(LD_DIR, "Adding %s certificate for directory authority %s with "
"signing key %s", from_store ? "cached" : "downloaded",
ds->nickname, hex_str(cert->signing_key_digest,DIGEST_LEN));
} else {
int adding = directory_caches_unknown_auth_certs(get_options());
log_info(LD_DIR, "%s %s certificate for unrecognized directory "
"authority with signing key %s",
adding ? "Adding" : "Not adding",
from_store ? "cached" : "downloaded",
hex_str(cert->signing_key_digest,DIGEST_LEN));
if (!adding) {
authority_cert_free(cert);
continue;
}
}
cl = get_cert_list(cert->cache_info.identity_digest);
smartlist_add(cl->certs, cert);
if (ds && cert->cache_info.published_on > ds->addr_current_at) {
/* Check to see whether we should update our view of the authority's
* address. */
if (cert->addr && cert->dir_port &&
(ds->addr != cert->addr ||
ds->dir_port != cert->dir_port)) {
char *a = tor_dup_ip(cert->addr);
log_notice(LD_DIR, "Updating address for directory authority %s "
"from %s:%d to %s:%d based on certificate.",
ds->nickname, ds->address, (int)ds->dir_port,
a, cert->dir_port);
tor_free(a);
ds->addr = cert->addr;
ds->dir_port = cert->dir_port;
}
ds->addr_current_at = cert->cache_info.published_on;
}
if (!from_store)
trusted_dir_servers_certs_changed = 1;
}
if (flush)
trusted_dirs_flush_certs_to_disk();
/* call this even if failure_code is <0, since some certs might have
* succeeded. */
networkstatus_note_certs_arrived();
return failure_code;
}
/** Save all v3 key certificates to the cached-certs file. */
void
trusted_dirs_flush_certs_to_disk(void)
{
char *filename;
smartlist_t *chunks;
if (!trusted_dir_servers_certs_changed || !trusted_dir_certs)
return;
chunks = smartlist_new();
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
{
sized_chunk_t *c = tor_malloc(sizeof(sized_chunk_t));
c->bytes = cert->cache_info.signed_descriptor_body;
c->len = cert->cache_info.signed_descriptor_len;
smartlist_add(chunks, c);
});
} DIGESTMAP_FOREACH_END;
filename = get_datadir_fname("cached-certs");
if (write_chunks_to_file(filename, chunks, 0, 0)) {
log_warn(LD_FS, "Error writing certificates to disk.");
}
tor_free(filename);
SMARTLIST_FOREACH(chunks, sized_chunk_t *, c, tor_free(c));
smartlist_free(chunks);
trusted_dir_servers_certs_changed = 0;
}
static int
compare_certs_by_pubdates(const void **_a, const void **_b)
{
const authority_cert_t *cert1 = *_a, *cert2=*_b;
if (cert1->cache_info.published_on < cert2->cache_info.published_on)
return -1;
else if (cert1->cache_info.published_on > cert2->cache_info.published_on)
return 1;
else
return 0;
}
/** Remove all expired v3 authority certificates that have been superseded for
* more than 48 hours or, if not expired, that were published more than 7 days
* before being superseded. (If the most recent cert was published more than 48
* hours ago, then we aren't going to get any consensuses signed with older
* keys.) */
static void
trusted_dirs_remove_old_certs(void)
{
time_t now = time(NULL);
#define DEAD_CERT_LIFETIME (2*24*60*60)
#define SUPERSEDED_CERT_LIFETIME (2*24*60*60)
if (!trusted_dir_certs)
return;
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
/* Sort the list from first-published to last-published */
smartlist_sort(cl->certs, compare_certs_by_pubdates);
SMARTLIST_FOREACH_BEGIN(cl->certs, authority_cert_t *, cert) {
if (cert_sl_idx == smartlist_len(cl->certs) - 1) {
/* This is the most recently published cert. Keep it. */
continue;
}
authority_cert_t *next_cert = smartlist_get(cl->certs, cert_sl_idx+1);
const time_t next_cert_published = next_cert->cache_info.published_on;
if (next_cert_published > now) {
/* All later certs are published in the future. Keep everything
* we didn't discard. */
break;
}
int should_remove = 0;
if (cert->expires + DEAD_CERT_LIFETIME < now) {
/* Certificate has been expired for at least DEAD_CERT_LIFETIME.
* Remove it. */
should_remove = 1;
} else if (next_cert_published + SUPERSEDED_CERT_LIFETIME < now) {
/* Certificate has been superseded for OLD_CERT_LIFETIME.
* Remove it.
*/
should_remove = 1;
}
if (should_remove) {
SMARTLIST_DEL_CURRENT_KEEPORDER(cl->certs, cert);
authority_cert_free(cert);
trusted_dir_servers_certs_changed = 1;
}
} SMARTLIST_FOREACH_END(cert);
} DIGESTMAP_FOREACH_END;
#undef DEAD_CERT_LIFETIME
#undef OLD_CERT_LIFETIME
trusted_dirs_flush_certs_to_disk();
}
/** Return the newest v3 authority certificate whose v3 authority identity key
* has digest <b>id_digest</b>. Return NULL if no such authority is known,
* or it has no certificate. */
authority_cert_t *
authority_cert_get_newest_by_id(const char *id_digest)
{
cert_list_t *cl;
authority_cert_t *best = NULL;
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return NULL;
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
{
if (!best || cert->cache_info.published_on > best->cache_info.published_on)
best = cert;
});
return best;
}
/** Return the newest v3 authority certificate whose directory signing key has
* digest <b>sk_digest</b>. Return NULL if no such certificate is known.
*/
authority_cert_t *
authority_cert_get_by_sk_digest(const char *sk_digest)
{
authority_cert_t *c;
if (!trusted_dir_certs)
return NULL;
if ((c = get_my_v3_authority_cert()) &&
tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN))
return c;
if ((c = get_my_v3_legacy_cert()) &&
tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN))
return c;
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
{
if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN))
return cert;
});
} DIGESTMAP_FOREACH_END;
return NULL;
}
/** Return the v3 authority certificate with signing key matching
* <b>sk_digest</b>, for the authority with identity digest <b>id_digest</b>.
* Return NULL if no such authority is known. */
authority_cert_t *
authority_cert_get_by_digests(const char *id_digest,
const char *sk_digest)
{
cert_list_t *cl;
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return NULL;
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN))
return cert; );
return NULL;
}
/** Add every known authority_cert_t to <b>certs_out</b>. */
void
authority_cert_get_all(smartlist_t *certs_out)
{
tor_assert(certs_out);
if (!trusted_dir_certs)
return;
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, c,
smartlist_add(certs_out, c));
} DIGESTMAP_FOREACH_END;
}
/** Called when an attempt to download a certificate with the authority with
* ID <b>id_digest</b> and, if not NULL, signed with key signing_key_digest
* fails with HTTP response code <b>status</b>: remember the failure, so we
* don't try again immediately. */
void
authority_cert_dl_failed(const char *id_digest,
const char *signing_key_digest, int status)
{
cert_list_t *cl;
download_status_t *dlstatus = NULL;
char id_digest_str[2*DIGEST_LEN+1];
char sk_digest_str[2*DIGEST_LEN+1];
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return;
/*
* Are we noting a failed download of the latest cert for the id digest,
* or of a download by (id, signing key) digest pair?
*/
if (!signing_key_digest) {
/* Just by id digest */
download_status_failed(&cl->dl_status_by_id, status);
} else {
/* Reset by (id, signing key) digest pair
*
* Look for a download_status_t in the map with this digest
*/
dlstatus = dsmap_get(cl->dl_status_map, signing_key_digest);
/* Got one? */
if (dlstatus) {
download_status_failed(dlstatus, status);
} else {
/*
* Do this rather than hex_str(), since hex_str clobbers
* old results and we call twice in the param list.
*/
base16_encode(id_digest_str, sizeof(id_digest_str),
id_digest, DIGEST_LEN);
base16_encode(sk_digest_str, sizeof(sk_digest_str),
signing_key_digest, DIGEST_LEN);
log_warn(LD_BUG,
"Got failure for cert fetch with (fp,sk) = (%s,%s), with "
"status %d, but knew nothing about the download.",
id_digest_str, sk_digest_str, status);
}
}
}
static const char *BAD_SIGNING_KEYS[] = {
"09CD84F751FD6E955E0F8ADB497D5401470D697E", // Expires 2015-01-11 16:26:31
"0E7E9C07F0969D0468AD741E172A6109DC289F3C", // Expires 2014-08-12 10:18:26
"57B85409891D3FB32137F642FDEDF8B7F8CDFDCD", // Expires 2015-02-11 17:19:09
"87326329007AF781F587AF5B594E540B2B6C7630", // Expires 2014-07-17 11:10:09
"98CC82342DE8D298CF99D3F1A396475901E0D38E", // Expires 2014-11-10 13:18:56
"9904B52336713A5ADCB13E4FB14DC919E0D45571", // Expires 2014-04-20 20:01:01
"9DCD8E3F1DD1597E2AD476BBA28A1A89F3095227", // Expires 2015-01-16 03:52:30
"A61682F34B9BB9694AC98491FE1ABBFE61923941", // Expires 2014-06-11 09:25:09
"B59F6E99C575113650C99F1C425BA7B20A8C071D", // Expires 2014-07-31 13:22:10
"D27178388FA75B96D37FA36E0B015227DDDBDA51", // Expires 2014-08-04 04:01:57
NULL,
};
/** DOCDOC */
int
authority_cert_is_blacklisted(const authority_cert_t *cert)
{
char hex_digest[HEX_DIGEST_LEN+1];
int i;
base16_encode(hex_digest, sizeof(hex_digest),
cert->signing_key_digest, sizeof(cert->signing_key_digest));
for (i = 0; BAD_SIGNING_KEYS[i]; ++i) {
if (!strcasecmp(hex_digest, BAD_SIGNING_KEYS[i])) {
return 1;
}
}
return 0;
}
/** Return true iff when we've been getting enough failures when trying to
* download the certificate with ID digest <b>id_digest</b> that we're willing
* to start bugging the user about it. */
int
authority_cert_dl_looks_uncertain(const char *id_digest)
{
#define N_AUTH_CERT_DL_FAILURES_TO_BUG_USER 2
cert_list_t *cl;
int n_failures;
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return 0;
n_failures = download_status_get_n_failures(&cl->dl_status_by_id);
return n_failures >= N_AUTH_CERT_DL_FAILURES_TO_BUG_USER;
}
/** Try to download any v3 authority certificates that we may be missing. If
* <b>status</b> is provided, try to get all the ones that were used to sign
* <b>status</b>. Additionally, try to have a non-expired certificate for
* every V3 authority in trusted_dir_servers. Don't fetch certificates we
* already have.
**/
void
authority_certs_fetch_missing(networkstatus_t *status, time_t now)
{
/*
* The pending_id digestmap tracks pending certificate downloads by
* identity digest; the pending_cert digestmap tracks pending downloads
* by (identity digest, signing key digest) pairs.
*/
digestmap_t *pending_id;
fp_pair_map_t *pending_cert;
authority_cert_t *cert;
/*
* The missing_id_digests smartlist will hold a list of id digests
* we want to fetch the newest cert for; the missing_cert_digests
* smartlist will hold a list of fp_pair_t with an identity and
* signing key digest.
*/
smartlist_t *missing_cert_digests, *missing_id_digests;
char *resource = NULL;
cert_list_t *cl;
const int cache = directory_caches_unknown_auth_certs(get_options());
fp_pair_t *fp_tmp = NULL;
char id_digest_str[2*DIGEST_LEN+1];
char sk_digest_str[2*DIGEST_LEN+1];
if (should_delay_dir_fetches(get_options(), NULL))
return;
pending_cert = fp_pair_map_new();
pending_id = digestmap_new();
missing_cert_digests = smartlist_new();
missing_id_digests = smartlist_new();
/*
* First, we get the lists of already pending downloads so we don't
* duplicate effort.
*/
list_pending_downloads(pending_id, NULL,
DIR_PURPOSE_FETCH_CERTIFICATE, "fp/");
list_pending_fpsk_downloads(pending_cert);
/*
* Now, we download any trusted authority certs we don't have by
* identity digest only. This gets the latest cert for that authority.
*/
SMARTLIST_FOREACH_BEGIN(trusted_dir_servers, dir_server_t *, ds) {
int found = 0;
if (!(ds->type & V3_DIRINFO))
continue;
if (smartlist_contains_digest(missing_id_digests,
ds->v3_identity_digest))
continue;
cl = get_cert_list(ds->v3_identity_digest);
SMARTLIST_FOREACH_BEGIN(cl->certs, authority_cert_t *, cert) {
if (now < cert->expires) {
/* It's not expired, and we weren't looking for something to
* verify a consensus with. Call it done. */
download_status_reset(&(cl->dl_status_by_id));
/* No sense trying to download it specifically by signing key hash */
download_status_reset_by_sk_in_cl(cl, cert->signing_key_digest);
found = 1;
break;
}
} SMARTLIST_FOREACH_END(cert);
if (!found &&
download_status_is_ready(&(cl->dl_status_by_id), now,
get_options()->TestingCertMaxDownloadTries) &&
!digestmap_get(pending_id, ds->v3_identity_digest)) {
log_info(LD_DIR,
"No current certificate known for authority %s "
"(ID digest %s); launching request.",
ds->nickname, hex_str(ds->v3_identity_digest, DIGEST_LEN));
smartlist_add(missing_id_digests, ds->v3_identity_digest);
}
} SMARTLIST_FOREACH_END(ds);
/*
* Next, if we have a consensus, scan through it and look for anything
* signed with a key from a cert we don't have. Those get downloaded
* by (fp,sk) pair, but if we don't know any certs at all for the fp
* (identity digest), and it's one of the trusted dir server certs
* we started off above or a pending download in pending_id, don't
* try to get it yet. Most likely, the one we'll get for that will
* have the right signing key too, and we'd just be downloading
* redundantly.
*/
if (status) {
SMARTLIST_FOREACH_BEGIN(status->voters, networkstatus_voter_info_t *,
voter) {
if (!smartlist_len(voter->sigs))
continue; /* This authority never signed this consensus, so don't
* go looking for a cert with key digest 0000000000. */
if (!cache &&
!trusteddirserver_get_by_v3_auth_digest(voter->identity_digest))
continue; /* We are not a cache, and we don't know this authority.*/
/*
* If we don't know *any* cert for this authority, and a download by ID
* is pending or we added it to missing_id_digests above, skip this
* one for now to avoid duplicate downloads.
*/
cl = get_cert_list(voter->identity_digest);
if (smartlist_len(cl->certs) == 0) {
/* We have no certs at all for this one */
/* Do we have a download of one pending? */
if (digestmap_get(pending_id, voter->identity_digest))
continue;
/*
* Are we about to launch a download of one due to the trusted
* dir server check above?
*/
if (smartlist_contains_digest(missing_id_digests,
voter->identity_digest))
continue;
}
SMARTLIST_FOREACH_BEGIN(voter->sigs, document_signature_t *, sig) {
cert = authority_cert_get_by_digests(voter->identity_digest,
sig->signing_key_digest);
if (cert) {
if (now < cert->expires)
download_status_reset_by_sk_in_cl(cl, sig->signing_key_digest);
continue;
}
if (download_status_is_ready_by_sk_in_cl(
cl, sig->signing_key_digest,
now, get_options()->TestingCertMaxDownloadTries) &&
!fp_pair_map_get_by_digests(pending_cert,
voter->identity_digest,
sig->signing_key_digest)) {
/*
* Do this rather than hex_str(), since hex_str clobbers
* old results and we call twice in the param list.
*/
base16_encode(id_digest_str, sizeof(id_digest_str),
voter->identity_digest, DIGEST_LEN);
base16_encode(sk_digest_str, sizeof(sk_digest_str),
sig->signing_key_digest, DIGEST_LEN);
if (voter->nickname) {
log_info(LD_DIR,
"We're missing a certificate from authority %s "
"(ID digest %s) with signing key %s: "
"launching request.",
voter->nickname, id_digest_str, sk_digest_str);
} else {
log_info(LD_DIR,
"We're missing a certificate from authority ID digest "
"%s with signing key %s: launching request.",
id_digest_str, sk_digest_str);
}
/* Allocate a new fp_pair_t to append */
fp_tmp = tor_malloc(sizeof(*fp_tmp));
memcpy(fp_tmp->first, voter->identity_digest, sizeof(fp_tmp->first));
memcpy(fp_tmp->second, sig->signing_key_digest,
sizeof(fp_tmp->second));
smartlist_add(missing_cert_digests, fp_tmp);
}
} SMARTLIST_FOREACH_END(sig);
} SMARTLIST_FOREACH_END(voter);
}
/* Do downloads by identity digest */
if (smartlist_len(missing_id_digests) > 0) {
int need_plus = 0;
smartlist_t *fps = smartlist_new();
smartlist_add(fps, tor_strdup("fp/"));
SMARTLIST_FOREACH_BEGIN(missing_id_digests, const char *, d) {
char *fp = NULL;
if (digestmap_get(pending_id, d))
continue;
base16_encode(id_digest_str, sizeof(id_digest_str),
d, DIGEST_LEN);
if (need_plus) {
tor_asprintf(&fp, "+%s", id_digest_str);
} else {
/* No need for tor_asprintf() in this case; first one gets no '+' */
fp = tor_strdup(id_digest_str);
need_plus = 1;
}
smartlist_add(fps, fp);
} SMARTLIST_FOREACH_END(d);
if (smartlist_len(fps) > 1) {
resource = smartlist_join_strings(fps, "", 0, NULL);
directory_get_from_dirserver(DIR_PURPOSE_FETCH_CERTIFICATE, 0,
resource, PDS_RETRY_IF_NO_SERVERS);
tor_free(resource);
}
/* else we didn't add any: they were all pending */
SMARTLIST_FOREACH(fps, char *, cp, tor_free(cp));
smartlist_free(fps);
}
/* Do downloads by identity digest/signing key pair */
if (smartlist_len(missing_cert_digests) > 0) {
int need_plus = 0;
smartlist_t *fp_pairs = smartlist_new();
smartlist_add(fp_pairs, tor_strdup("fp-sk/"));
SMARTLIST_FOREACH_BEGIN(missing_cert_digests, const fp_pair_t *, d) {
char *fp_pair = NULL;
if (fp_pair_map_get(pending_cert, d))
continue;
/* Construct string encodings of the digests */
base16_encode(id_digest_str, sizeof(id_digest_str),
d->first, DIGEST_LEN);
base16_encode(sk_digest_str, sizeof(sk_digest_str),
d->second, DIGEST_LEN);
/* Now tor_asprintf() */
if (need_plus) {
tor_asprintf(&fp_pair, "+%s-%s", id_digest_str, sk_digest_str);
} else {
/* First one in the list doesn't get a '+' */
tor_asprintf(&fp_pair, "%s-%s", id_digest_str, sk_digest_str);
need_plus = 1;
}
/* Add it to the list of pairs to request */
smartlist_add(fp_pairs, fp_pair);
} SMARTLIST_FOREACH_END(d);
if (smartlist_len(fp_pairs) > 1) {
resource = smartlist_join_strings(fp_pairs, "", 0, NULL);
directory_get_from_dirserver(DIR_PURPOSE_FETCH_CERTIFICATE, 0,
resource, PDS_RETRY_IF_NO_SERVERS);
tor_free(resource);
}
/* else they were all pending */
SMARTLIST_FOREACH(fp_pairs, char *, p, tor_free(p));
smartlist_free(fp_pairs);
}
smartlist_free(missing_id_digests);
SMARTLIST_FOREACH(missing_cert_digests, fp_pair_t *, p, tor_free(p));
smartlist_free(missing_cert_digests);
digestmap_free(pending_id, NULL);
fp_pair_map_free(pending_cert, NULL);
}
/* Router descriptor storage.
*
* Routerdescs are stored in a big file, named "cached-descriptors". As new
* routerdescs arrive, we append them to a journal file named
* "cached-descriptors.new".
*
* From time to time, we replace "cached-descriptors" with a new file
* containing only the live, non-superseded descriptors, and clear
* cached-routers.new.
*
* On startup, we read both files.
*/
/** Helper: return 1 iff the router log is so big we want to rebuild the
* store. */
static int
router_should_rebuild_store(desc_store_t *store)
{
if (store->store_len > (1<<16))
return (store->journal_len > store->store_len / 2 ||
store->bytes_dropped > store->store_len / 2);
else
return store->journal_len > (1<<15);
}
/** Return the desc_store_t in <b>rl</b> that should be used to store
* <b>sd</b>. */
static INLINE desc_store_t *
desc_get_store(routerlist_t *rl, const signed_descriptor_t *sd)
{
if (sd->is_extrainfo)
return &rl->extrainfo_store;
else
return &rl->desc_store;
}
/** Add the signed_descriptor_t in <b>desc</b> to the router
* journal; change its saved_location to SAVED_IN_JOURNAL and set its
* offset appropriately. */
static int