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tor/src/feature/dirclient/dirclient.c

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/* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file dirclient.c
* @brief Download directory information
**/
#define DIRCLIENT_PRIVATE
#include "core/or/or.h"
#include "app/config/config.h"
#include "core/mainloop/connection.h"
#include "core/mainloop/mainloop.h"
#include "core/or/connection_edge.h"
#include "core/or/policies.h"
#include "feature/client/bridges.h"
#include "feature/client/entrynodes.h"
#include "feature/control/control_events.h"
#include "feature/dirauth/authmode.h"
#include "feature/dirclient/dirclient.h"
#include "feature/dirauth/dirvote.h"
#include "feature/dirauth/shared_random.h"
#include "feature/dircache/dirserv.h"
#include "feature/dirclient/dirclient.h"
#include "feature/dirclient/dirclient_modes.h"
#include "feature/dirclient/dlstatus.h"
#include "feature/dircommon/consdiff.h"
#include "feature/dircommon/directory.h"
#include "feature/dircommon/fp_pair.h"
#include "feature/hs/hs_cache.h"
#include "feature/hs/hs_client.h"
#include "feature/hs/hs_control.h"
#include "feature/nodelist/authcert.h"
#include "feature/nodelist/describe.h"
#include "feature/nodelist/dirlist.h"
#include "feature/nodelist/microdesc.h"
#include "feature/nodelist/networkstatus.h"
#include "feature/nodelist/node_select.h"
#include "feature/nodelist/nodelist.h"
#include "feature/nodelist/routerinfo.h"
#include "feature/nodelist/routerlist.h"
#include "feature/nodelist/routerset.h"
#include "feature/relay/relay_find_addr.h"
#include "feature/relay/routermode.h"
#include "feature/relay/selftest.h"
#include "feature/rend/rendcache.h"
#include "feature/rend/rendclient.h"
#include "feature/rend/rendcommon.h"
#include "feature/rend/rendservice.h"
#include "feature/stats/predict_ports.h"
#include "lib/cc/ctassert.h"
#include "lib/compress/compress.h"
#include "lib/crypt_ops/crypto_format.h"
#include "lib/crypt_ops/crypto_util.h"
#include "lib/encoding/confline.h"
#include "lib/err/backtrace.h"
#include "core/or/entry_connection_st.h"
#include "feature/dircache/cached_dir_st.h"
#include "feature/dirclient/dir_server_st.h"
#include "feature/dircommon/dir_connection_st.h"
#include "feature/nodelist/networkstatus_st.h"
#include "feature/nodelist/node_st.h"
#include "feature/nodelist/routerinfo_st.h"
#include "feature/rend/rend_service_descriptor_st.h"
/** Maximum size, in bytes, for any directory object that we've downloaded. */
#define MAX_DIR_DL_SIZE ((1<<24)-1) /* 16 MB - 1 */
/** How far in the future do we allow a directory server to tell us it is
* before deciding that one of us has the wrong time? */
#define ALLOW_DIRECTORY_TIME_SKEW (30*60)
static int body_is_plausible(const char *body, size_t body_len, int purpose);
static void connection_dir_download_routerdesc_failed(dir_connection_t *conn);
static void connection_dir_bridge_routerdesc_failed(dir_connection_t *conn);
static void connection_dir_download_cert_failed(
dir_connection_t *conn, int status_code);
static void connection_dir_retry_bridges(smartlist_t *descs);
static void dir_routerdesc_download_failed(smartlist_t *failed,
int status_code,
int router_purpose,
int was_extrainfo,
int was_descriptor_digests);
static void dir_microdesc_download_failed(smartlist_t *failed,
int status_code,
const char *dir_id);
static void directory_send_command(dir_connection_t *conn,
const int direct,
const directory_request_t *req);
static void connection_dir_close_consensus_fetches(
dir_connection_t *except_this_one, const char *resource);
/** Return a string describing a given directory connection purpose. */
STATIC const char *
dir_conn_purpose_to_string(int purpose)
{
switch (purpose)
{
case DIR_PURPOSE_UPLOAD_DIR:
return "server descriptor upload";
case DIR_PURPOSE_UPLOAD_VOTE:
return "server vote upload";
case DIR_PURPOSE_UPLOAD_SIGNATURES:
return "consensus signature upload";
case DIR_PURPOSE_FETCH_SERVERDESC:
return "server descriptor fetch";
case DIR_PURPOSE_FETCH_EXTRAINFO:
return "extra-info fetch";
case DIR_PURPOSE_FETCH_CONSENSUS:
return "consensus network-status fetch";
case DIR_PURPOSE_FETCH_CERTIFICATE:
return "authority cert fetch";
case DIR_PURPOSE_FETCH_STATUS_VOTE:
return "status vote fetch";
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES:
return "consensus signature fetch";
case DIR_PURPOSE_FETCH_RENDDESC_V2:
return "hidden-service v2 descriptor fetch";
case DIR_PURPOSE_UPLOAD_RENDDESC_V2:
return "hidden-service v2 descriptor upload";
case DIR_PURPOSE_FETCH_HSDESC:
return "hidden-service descriptor fetch";
case DIR_PURPOSE_UPLOAD_HSDESC:
return "hidden-service descriptor upload";
case DIR_PURPOSE_FETCH_MICRODESC:
return "microdescriptor fetch";
}
log_warn(LD_BUG, "Called with unknown purpose %d", purpose);
return "(unknown)";
}
/** Return the requisite directory information types. */
STATIC dirinfo_type_t
dir_fetch_type(int dir_purpose, int router_purpose, const char *resource)
{
dirinfo_type_t type;
switch (dir_purpose) {
case DIR_PURPOSE_FETCH_EXTRAINFO:
type = EXTRAINFO_DIRINFO;
if (router_purpose == ROUTER_PURPOSE_BRIDGE)
type |= BRIDGE_DIRINFO;
else
type |= V3_DIRINFO;
break;
case DIR_PURPOSE_FETCH_SERVERDESC:
if (router_purpose == ROUTER_PURPOSE_BRIDGE)
type = BRIDGE_DIRINFO;
else
type = V3_DIRINFO;
break;
case DIR_PURPOSE_FETCH_STATUS_VOTE:
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES:
case DIR_PURPOSE_FETCH_CERTIFICATE:
type = V3_DIRINFO;
break;
case DIR_PURPOSE_FETCH_CONSENSUS:
type = V3_DIRINFO;
if (resource && !strcmp(resource, "microdesc"))
type |= MICRODESC_DIRINFO;
break;
case DIR_PURPOSE_FETCH_MICRODESC:
type = MICRODESC_DIRINFO;
break;
default:
log_warn(LD_BUG, "Unexpected purpose %d", (int)dir_purpose);
type = NO_DIRINFO;
break;
}
return type;
}
/** Return true iff <b>identity_digest</b> is the digest of a router which
* says that it caches extrainfos. (If <b>is_authority</b> we always
* believe that to be true.) */
int
router_supports_extrainfo(const char *identity_digest, int is_authority)
{
const node_t *node = node_get_by_id(identity_digest);
if (node && node->ri) {
if (node->ri->caches_extra_info)
return 1;
}
if (is_authority) {
return 1;
}
return 0;
}
/** Return true iff any trusted directory authority has accepted our
* server descriptor.
*
* We consider any authority sufficient because waiting for all of
* them means it never happens while any authority is down; we don't
* go for something more complex in the middle (like \>1/3 or \>1/2 or
* \>=1/2) because that doesn't seem necessary yet.
*/
int
directories_have_accepted_server_descriptor(void)
{
const smartlist_t *servers = router_get_trusted_dir_servers();
const or_options_t *options = get_options();
SMARTLIST_FOREACH(servers, dir_server_t *, d, {
if ((d->type & options->PublishServerDescriptor_) &&
d->has_accepted_serverdesc) {
return 1;
}
});
return 0;
}
/** Start a connection to every suitable directory authority, using
* connection purpose <b>dir_purpose</b> and uploading <b>payload</b>
* (of length <b>payload_len</b>). The dir_purpose should be one of
* 'DIR_PURPOSE_UPLOAD_{DIR|VOTE|SIGNATURES}'.
*
* <b>router_purpose</b> describes the type of descriptor we're
* publishing, if we're publishing a descriptor -- e.g. general or bridge.
*
* <b>type</b> specifies what sort of dir authorities (V3,
* BRIDGE, etc) we should upload to.
*
* If <b>extrainfo_len</b> is nonzero, the first <b>payload_len</b> bytes of
* <b>payload</b> hold a router descriptor, and the next <b>extrainfo_len</b>
* bytes of <b>payload</b> hold an extra-info document. Upload the descriptor
* to all authorities, and the extra-info document to all authorities that
* support it.
*/
void
directory_post_to_dirservers(uint8_t dir_purpose, uint8_t router_purpose,
dirinfo_type_t type,
const char *payload,
size_t payload_len, size_t extrainfo_len)
{
const or_options_t *options = get_options();
dir_indirection_t indirection;
const smartlist_t *dirservers = router_get_trusted_dir_servers();
int found = 0;
const int exclude_self = (dir_purpose == DIR_PURPOSE_UPLOAD_VOTE ||
dir_purpose == DIR_PURPOSE_UPLOAD_SIGNATURES);
tor_assert(dirservers);
/* This tries dirservers which we believe to be down, but ultimately, that's
* harmless, and we may as well err on the side of getting things uploaded.
*/
SMARTLIST_FOREACH_BEGIN(dirservers, dir_server_t *, ds) {
routerstatus_t *rs = &(ds->fake_status);
size_t upload_len = payload_len;
if ((type & ds->type) == 0)
continue;
if (exclude_self && router_digest_is_me(ds->digest)) {
/* we don't upload to ourselves, but at least there's now at least
* one authority of this type that has what we wanted to upload. */
found = 1;
continue;
}
if (options->StrictNodes &&
routerset_contains_routerstatus(options->ExcludeNodes, rs, -1)) {
log_warn(LD_DIR, "Wanted to contact authority '%s' for %s, but "
"it's in our ExcludedNodes list and StrictNodes is set. "
"Skipping.",
ds->nickname,
dir_conn_purpose_to_string(dir_purpose));
continue;
}
found = 1; /* at least one authority of this type was listed */
if (dir_purpose == DIR_PURPOSE_UPLOAD_DIR)
ds->has_accepted_serverdesc = 0;
if (extrainfo_len && router_supports_extrainfo(ds->digest, 1)) {
upload_len += extrainfo_len;
log_info(LD_DIR, "Uploading an extrainfo too (length %d)",
(int) extrainfo_len);
}
if (purpose_needs_anonymity(dir_purpose, router_purpose, NULL)) {
indirection = DIRIND_ANONYMOUS;
} else if (!fascist_firewall_allows_dir_server(ds,
FIREWALL_DIR_CONNECTION,
0)) {
if (fascist_firewall_allows_dir_server(ds, FIREWALL_OR_CONNECTION, 0))
indirection = DIRIND_ONEHOP;
else
indirection = DIRIND_ANONYMOUS;
} else {
indirection = DIRIND_DIRECT_CONN;
}
directory_request_t *req = directory_request_new(dir_purpose);
directory_request_set_routerstatus(req, rs);
directory_request_set_router_purpose(req, router_purpose);
directory_request_set_indirection(req, indirection);
directory_request_set_payload(req, payload, upload_len);
directory_initiate_request(req);
directory_request_free(req);
} SMARTLIST_FOREACH_END(ds);
if (!found) {
char *s = authdir_type_to_string(type);
log_warn(LD_DIR, "Publishing server descriptor to directory authorities "
"of type '%s', but no authorities of that type listed!", s);
tor_free(s);
}
}
/** Return true iff, according to the values in <b>options</b>, we should be
* using directory guards for direct downloads of directory information. */
STATIC int
should_use_directory_guards(const or_options_t *options)
{
/* Public (non-bridge) servers never use directory guards. */
if (public_server_mode(options))
return 0;
/* If guards are disabled, we can't use directory guards.
*/
if (!options->UseEntryGuards)
return 0;
/* If we're configured to fetch directory info aggressively or of a
* nonstandard type, don't use directory guards. */
if (options->DownloadExtraInfo || options->FetchDirInfoEarly ||
options->FetchDirInfoExtraEarly || options->FetchUselessDescriptors)
return 0;
return 1;
}
/** Pick an unconstrained directory server from among our guards, the latest
* networkstatus, or the fallback dirservers, for use in downloading
* information of type <b>type</b>, and return its routerstatus. */
static const routerstatus_t *
directory_pick_generic_dirserver(dirinfo_type_t type, int pds_flags,
uint8_t dir_purpose,
circuit_guard_state_t **guard_state_out)
{
const routerstatus_t *rs = NULL;
const or_options_t *options = get_options();
if (options->UseBridges)
log_warn(LD_BUG, "Called when we have UseBridges set.");
if (should_use_directory_guards(options)) {
const node_t *node = guards_choose_dirguard(dir_purpose, guard_state_out);
if (node)
rs = node->rs;
} else {
/* anybody with a non-zero dirport will do */
rs = router_pick_directory_server(type, pds_flags);
}
if (!rs) {
log_info(LD_DIR, "No router found for %s; falling back to "
"dirserver list.", dir_conn_purpose_to_string(dir_purpose));
rs = router_pick_fallback_dirserver(type, pds_flags);
}
return rs;
}
/**
* Set the extra fields in <b>req</b> that are used when requesting a
* consensus of type <b>resource</b>.
*
* Right now, these fields are if-modified-since and x-or-diff-from-consensus.
*/
static void
dir_consensus_request_set_additional_headers(directory_request_t *req,
const char *resource)
{
time_t if_modified_since = 0;
uint8_t or_diff_from[DIGEST256_LEN];
int or_diff_from_is_set = 0;
/* DEFAULT_IF_MODIFIED_SINCE_DELAY is 1/20 of the default consensus
* period of 1 hour.
*/
const int DEFAULT_IF_MODIFIED_SINCE_DELAY = 180;
const int32_t DEFAULT_TRY_DIFF_FOR_CONSENSUS_NEWER = 72;
const int32_t MIN_TRY_DIFF_FOR_CONSENSUS_NEWER = 0;
const int32_t MAX_TRY_DIFF_FOR_CONSENSUS_NEWER = 8192;
const char TRY_DIFF_FOR_CONSENSUS_NEWER_NAME[] =
"try-diff-for-consensus-newer-than";
int flav = FLAV_NS;
if (resource)
flav = networkstatus_parse_flavor_name(resource);
int32_t max_age_for_diff = 3600 *
networkstatus_get_param(NULL,
TRY_DIFF_FOR_CONSENSUS_NEWER_NAME,
DEFAULT_TRY_DIFF_FOR_CONSENSUS_NEWER,
MIN_TRY_DIFF_FOR_CONSENSUS_NEWER,
MAX_TRY_DIFF_FOR_CONSENSUS_NEWER);
if (flav != -1) {
/* IF we have a parsed consensus of this type, we can do an
* if-modified-time based on it. */
networkstatus_t *v;
v = networkstatus_get_latest_consensus_by_flavor(flav);
if (v) {
/* In networks with particularly short V3AuthVotingIntervals,
* ask for the consensus if it's been modified since half the
* V3AuthVotingInterval of the most recent consensus. */
time_t ims_delay = DEFAULT_IF_MODIFIED_SINCE_DELAY;
if (v->fresh_until > v->valid_after
&& ims_delay > (v->fresh_until - v->valid_after)/2) {
ims_delay = (v->fresh_until - v->valid_after)/2;
}
if_modified_since = v->valid_after + ims_delay;
if (v->valid_after >= approx_time() - max_age_for_diff) {
memcpy(or_diff_from, v->digest_sha3_as_signed, DIGEST256_LEN);
or_diff_from_is_set = 1;
}
}
} else {
/* Otherwise it might be a consensus we don't parse, but which we
* do cache. Look at the cached copy, perhaps. */
cached_dir_t *cd = dirserv_get_consensus(resource);
/* We have no method of determining the voting interval from an
* unparsed consensus, so we use the default. */
if (cd) {
if_modified_since = cd->published + DEFAULT_IF_MODIFIED_SINCE_DELAY;
if (cd->published >= approx_time() - max_age_for_diff) {
memcpy(or_diff_from, cd->digest_sha3_as_signed, DIGEST256_LEN);
or_diff_from_is_set = 1;
}
}
}
if (if_modified_since > 0)
directory_request_set_if_modified_since(req, if_modified_since);
if (or_diff_from_is_set) {
char hex[HEX_DIGEST256_LEN + 1];
base16_encode(hex, sizeof(hex),
(const char*)or_diff_from, sizeof(or_diff_from));
directory_request_add_header(req, X_OR_DIFF_FROM_CONSENSUS_HEADER, hex);
}
}
/** Start a connection to a random running directory server, using
* connection purpose <b>dir_purpose</b>, intending to fetch descriptors
* of purpose <b>router_purpose</b>, and requesting <b>resource</b>.
* Use <b>pds_flags</b> as arguments to router_pick_directory_server()
* or router_pick_trusteddirserver().
*/
MOCK_IMPL(void,
directory_get_from_dirserver,(
uint8_t dir_purpose,
uint8_t router_purpose,
const char *resource,
int pds_flags,
download_want_authority_t want_authority))
{
const routerstatus_t *rs = NULL;
const or_options_t *options = get_options();
int prefer_authority = (dirclient_fetches_from_authorities(options)
|| want_authority == DL_WANT_AUTHORITY);
int require_authority = 0;
int get_via_tor = purpose_needs_anonymity(dir_purpose, router_purpose,
resource);
dirinfo_type_t type = dir_fetch_type(dir_purpose, router_purpose, resource);
if (type == NO_DIRINFO)
return;
if (!options->FetchServerDescriptors)
return;
circuit_guard_state_t *guard_state = NULL;
if (!get_via_tor) {
if (options->UseBridges && !(type & BRIDGE_DIRINFO)) {
/* We want to ask a running bridge for which we have a descriptor.
*
* When we ask choose_random_entry() for a bridge, we specify what
* sort of dir fetch we'll be doing, so it won't return a bridge
* that can't answer our question.
*/
const node_t *node = guards_choose_dirguard(dir_purpose, &guard_state);
if (node && node->ri) {
/* every bridge has a routerinfo. */
routerinfo_t *ri = node->ri;
/* clients always make OR connections to bridges */
tor_addr_port_t or_ap;
directory_request_t *req = directory_request_new(dir_purpose);
/* we are willing to use a non-preferred address if we need to */
fascist_firewall_choose_address_node(node, FIREWALL_OR_CONNECTION, 0,
&or_ap);
directory_request_set_or_addr_port(req, &or_ap);
directory_request_set_directory_id_digest(req,
ri->cache_info.identity_digest);
directory_request_set_router_purpose(req, router_purpose);
directory_request_set_resource(req, resource);
if (dir_purpose == DIR_PURPOSE_FETCH_CONSENSUS)
dir_consensus_request_set_additional_headers(req, resource);
directory_request_set_guard_state(req, guard_state);
directory_initiate_request(req);
directory_request_free(req);
} else {
if (guard_state) {
entry_guard_cancel(&guard_state);
}
log_notice(LD_DIR, "Ignoring directory request, since no bridge "
"nodes are available yet.");
}
return;
} else {
if (prefer_authority || (type & BRIDGE_DIRINFO)) {
/* only ask authdirservers, and don't ask myself */
rs = router_pick_trusteddirserver(type, pds_flags);
if (rs == NULL && (pds_flags & (PDS_NO_EXISTING_SERVERDESC_FETCH|
PDS_NO_EXISTING_MICRODESC_FETCH))) {
/* We don't want to fetch from any authorities that we're currently
* fetching server descriptors from, and we got no match. Did we
* get no match because all the authorities have connections
* fetching server descriptors (in which case we should just
* return,) or because all the authorities are down or on fire or
* unreachable or something (in which case we should go on with
* our fallback code)? */
pds_flags &= ~(PDS_NO_EXISTING_SERVERDESC_FETCH|
PDS_NO_EXISTING_MICRODESC_FETCH);
rs = router_pick_trusteddirserver(type, pds_flags);
if (rs) {
log_debug(LD_DIR, "Deferring serverdesc fetch: all authorities "
"are in use.");
return;
}
}
if (rs == NULL && require_authority) {
log_info(LD_DIR, "No authorities were available for %s: will try "
"later.", dir_conn_purpose_to_string(dir_purpose));
return;
}
}
if (!rs && !(type & BRIDGE_DIRINFO)) {
rs = directory_pick_generic_dirserver(type, pds_flags,
dir_purpose,
&guard_state);
if (!rs)
get_via_tor = 1; /* last resort: try routing it via Tor */
}
}
}
if (get_via_tor) {
/* Never use fascistfirewall; we're going via Tor. */
pds_flags |= PDS_IGNORE_FASCISTFIREWALL;
rs = router_pick_directory_server(type, pds_flags);
}
/* If we have any hope of building an indirect conn, we know some router
* descriptors. If (rs==NULL), we can't build circuits anyway, so
* there's no point in falling back to the authorities in this case. */
if (rs) {
const dir_indirection_t indirection =
get_via_tor ? DIRIND_ANONYMOUS : DIRIND_ONEHOP;
directory_request_t *req = directory_request_new(dir_purpose);
directory_request_set_routerstatus(req, rs);
directory_request_set_router_purpose(req, router_purpose);
directory_request_set_indirection(req, indirection);
directory_request_set_resource(req, resource);
if (dir_purpose == DIR_PURPOSE_FETCH_CONSENSUS)
dir_consensus_request_set_additional_headers(req, resource);
if (guard_state)
directory_request_set_guard_state(req, guard_state);
directory_initiate_request(req);
directory_request_free(req);
} else {
log_notice(LD_DIR,
"While fetching directory info, "
"no running dirservers known. Will try again later. "
"(purpose %d)", dir_purpose);
if (!purpose_needs_anonymity(dir_purpose, router_purpose, resource)) {
/* remember we tried them all and failed. */
directory_all_unreachable(time(NULL));
}
}
}
/** As directory_get_from_dirserver, but initiates a request to <i>every</i>
* directory authority other than ourself. Only for use by authorities when
* searching for missing information while voting. */
void
directory_get_from_all_authorities(uint8_t dir_purpose,
uint8_t router_purpose,
const char *resource)
{
tor_assert(dir_purpose == DIR_PURPOSE_FETCH_STATUS_VOTE ||
dir_purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES);
SMARTLIST_FOREACH_BEGIN(router_get_trusted_dir_servers(),
dir_server_t *, ds) {
if (router_digest_is_me(ds->digest))
continue;
if (!(ds->type & V3_DIRINFO))
continue;
const routerstatus_t *rs = &ds->fake_status;
directory_request_t *req = directory_request_new(dir_purpose);
directory_request_set_routerstatus(req, rs);
directory_request_set_router_purpose(req, router_purpose);
directory_request_set_resource(req, resource);
directory_initiate_request(req);
directory_request_free(req);
} SMARTLIST_FOREACH_END(ds);
}
/** Return true iff <b>ind</b> requires a multihop circuit. */
static int
dirind_is_anon(dir_indirection_t ind)
{
return ind == DIRIND_ANON_DIRPORT || ind == DIRIND_ANONYMOUS;
}
/* Choose reachable OR and Dir addresses and ports from status, copying them
* into use_or_ap and use_dir_ap. If indirection is anonymous, then we're
* connecting via another relay, so choose the primary IPv4 address and ports.
*
* status should have at least one reachable address, if we can't choose a
* reachable address, warn and return -1. Otherwise, return 0.
*/
static int
directory_choose_address_routerstatus(const routerstatus_t *status,
dir_indirection_t indirection,
tor_addr_port_t *use_or_ap,
tor_addr_port_t *use_dir_ap)
{
tor_assert(status != NULL);
tor_assert(use_or_ap != NULL);
tor_assert(use_dir_ap != NULL);
const or_options_t *options = get_options();
int have_or = 0, have_dir = 0;
/* We expect status to have at least one reachable address if we're
* connecting to it directly.
*
* Therefore, we can simply use the other address if the one we want isn't
* allowed by the firewall.
*
* (When Tor uploads and downloads a hidden service descriptor, it uses
* DIRIND_ANONYMOUS. Even Single Onion Servers (NYI) use DIRIND_ANONYMOUS,
* to avoid HSDirs denying service by rejecting descriptors.)
*/
/* Initialise the OR / Dir addresses */
tor_addr_make_null(&use_or_ap->addr, AF_UNSPEC);
use_or_ap->port = 0;
tor_addr_make_null(&use_dir_ap->addr, AF_UNSPEC);
use_dir_ap->port = 0;
/* ORPort connections */
if (indirection == DIRIND_ANONYMOUS) {
if (status->addr) {
/* Since we're going to build a 3-hop circuit and ask the 2nd relay
* to extend to this address, always use the primary (IPv4) OR address */
tor_addr_from_ipv4h(&use_or_ap->addr, status->addr);
use_or_ap->port = status->or_port;
have_or = 1;
}
} else if (indirection == DIRIND_ONEHOP) {
/* We use an IPv6 address if we have one and we prefer it.
* Use the preferred address and port if they are reachable, otherwise,
* use the alternate address and port (if any).
*/
fascist_firewall_choose_address_rs(status, FIREWALL_OR_CONNECTION, 0,
use_or_ap);
have_or = tor_addr_port_is_valid_ap(use_or_ap, 0);
}
/* DirPort connections
* DIRIND_ONEHOP uses ORPort, but may fall back to the DirPort on relays */
if (indirection == DIRIND_DIRECT_CONN ||
indirection == DIRIND_ANON_DIRPORT ||
(indirection == DIRIND_ONEHOP
&& !dirclient_must_use_begindir(options))) {
fascist_firewall_choose_address_rs(status, FIREWALL_DIR_CONNECTION, 0,
use_dir_ap);
have_dir = tor_addr_port_is_valid_ap(use_dir_ap, 0);
}
/* We rejected all addresses in the relay's status. This means we can't
* connect to it. */
if (!have_or && !have_dir) {
static int logged_backtrace = 0;
log_info(LD_BUG, "Rejected all OR and Dir addresses from %s when "
"launching an outgoing directory connection to: IPv4 %s OR %d "
"Dir %d IPv6 %s OR %d Dir %d", routerstatus_describe(status),
fmt_addr32(status->addr), status->or_port,
status->dir_port, fmt_addr(&status->ipv6_addr),
status->ipv6_orport, status->dir_port);
if (!logged_backtrace) {
log_backtrace(LOG_INFO, LD_BUG, "Addresses came from");
logged_backtrace = 1;
}
return -1;
}
return 0;
}
/** Return true iff <b>conn</b> is the client side of a directory connection
* we launched to ourself in order to determine the reachability of our
* dir_port. */
static int
directory_conn_is_self_reachability_test(dir_connection_t *conn)
{
if (conn->requested_resource &&
!strcmpstart(conn->requested_resource,"authority")) {
const routerinfo_t *me = router_get_my_routerinfo();
if (me &&
router_digest_is_me(conn->identity_digest) &&
tor_addr_eq_ipv4h(&conn->base_.addr, me->addr) && /*XXXX prop 118*/
me->dir_port == conn->base_.port)
return 1;
}
return 0;
}
/** Called when we are unable to complete the client's request to a directory
* server due to a network error: Mark the router as down and try again if
* possible.
*/
void
connection_dir_client_request_failed(dir_connection_t *conn)
{
if (conn->guard_state) {
/* We haven't seen a success on this guard state, so consider it to have
* failed. */
entry_guard_failed(&conn->guard_state);
}
if (directory_conn_is_self_reachability_test(conn)) {
return; /* this was a test fetch. don't retry. */
}
if (!entry_list_is_constrained(get_options()))
router_set_status(conn->identity_digest, 0); /* don't try this one again */
if (conn->base_.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->base_.purpose == DIR_PURPOSE_FETCH_EXTRAINFO) {
log_info(LD_DIR, "Giving up on serverdesc/extrainfo fetch from "
"directory server at '%s'; retrying",
conn->base_.address);
if (conn->router_purpose == ROUTER_PURPOSE_BRIDGE)
connection_dir_bridge_routerdesc_failed(conn);
connection_dir_download_routerdesc_failed(conn);
} else if (conn->base_.purpose == DIR_PURPOSE_FETCH_CONSENSUS) {
if (conn->requested_resource)
networkstatus_consensus_download_failed(0, conn->requested_resource);
} else if (conn->base_.purpose == DIR_PURPOSE_FETCH_CERTIFICATE) {
log_info(LD_DIR, "Giving up on certificate fetch from directory server "
"at '%s'; retrying",
conn->base_.address);
connection_dir_download_cert_failed(conn, 0);
} else if (conn->base_.purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES) {
log_info(LD_DIR, "Giving up downloading detached signatures from '%s'",
conn->base_.address);
} else if (conn->base_.purpose == DIR_PURPOSE_FETCH_STATUS_VOTE) {
log_info(LD_DIR, "Giving up downloading votes from '%s'",
conn->base_.address);
} else if (conn->base_.purpose == DIR_PURPOSE_FETCH_MICRODESC) {
log_info(LD_DIR, "Giving up on downloading microdescriptors from "
"directory server at '%s'; will retry", conn->base_.address);
connection_dir_download_routerdesc_failed(conn);
}
}
/** Helper: Attempt to fetch directly the descriptors of each bridge
* listed in <b>failed</b>.
*/
static void
connection_dir_retry_bridges(smartlist_t *descs)
{
char digest[DIGEST_LEN];
SMARTLIST_FOREACH(descs, const char *, cp,
{
if (base16_decode(digest, DIGEST_LEN, cp, strlen(cp)) != DIGEST_LEN) {
log_warn(LD_BUG, "Malformed fingerprint in list: %s",
escaped(cp));
continue;
}
retry_bridge_descriptor_fetch_directly(digest);
});
}
/** Called when an attempt to download one or more router descriptors
* or extra-info documents on connection <b>conn</b> failed.
*/
static void
connection_dir_download_routerdesc_failed(dir_connection_t *conn)
{
/* No need to increment the failure count for routerdescs, since
* it's not their fault. */
/* No need to relaunch descriptor downloads here: we already do it
* every 10 or 60 seconds (FOO_DESCRIPTOR_RETRY_INTERVAL) in main.c. */
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->base_.purpose == DIR_PURPOSE_FETCH_EXTRAINFO ||
conn->base_.purpose == DIR_PURPOSE_FETCH_MICRODESC);
(void) conn;
}
/** Called when an attempt to download a bridge's routerdesc from
* one of the authorities failed due to a network error. If
* possible attempt to download descriptors from the bridge directly.
*/
static void
connection_dir_bridge_routerdesc_failed(dir_connection_t *conn)
{
smartlist_t *which = NULL;
/* Requests for bridge descriptors are in the form 'fp/', so ignore
anything else. */
if (!conn->requested_resource || strcmpstart(conn->requested_resource,"fp/"))
return;
which = smartlist_new();
dir_split_resource_into_fingerprints(conn->requested_resource
+ strlen("fp/"),
which, NULL, 0);
tor_assert(conn->base_.purpose != DIR_PURPOSE_FETCH_EXTRAINFO);
if (smartlist_len(which)) {
connection_dir_retry_bridges(which);
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
}
smartlist_free(which);
}
/** Called when an attempt to fetch a certificate fails. */
static void
connection_dir_download_cert_failed(dir_connection_t *conn, int status)
{
const char *fp_pfx = "fp/";
const char *fpsk_pfx = "fp-sk/";
smartlist_t *failed;
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_CERTIFICATE);
if (!conn->requested_resource)
return;
failed = smartlist_new();
/*
* We have two cases download by fingerprint (resource starts
* with "fp/") or download by fingerprint/signing key pair
* (resource starts with "fp-sk/").
*/
if (!strcmpstart(conn->requested_resource, fp_pfx)) {
/* Download by fingerprint case */
dir_split_resource_into_fingerprints(conn->requested_resource +
strlen(fp_pfx),
failed, NULL, DSR_HEX);
SMARTLIST_FOREACH_BEGIN(failed, char *, cp) {
/* Null signing key digest indicates download by fp only */
authority_cert_dl_failed(cp, NULL, status);
tor_free(cp);
} SMARTLIST_FOREACH_END(cp);
} else if (!strcmpstart(conn->requested_resource, fpsk_pfx)) {
/* Download by (fp,sk) pairs */
dir_split_resource_into_fingerprint_pairs(conn->requested_resource +
strlen(fpsk_pfx), failed);
SMARTLIST_FOREACH_BEGIN(failed, fp_pair_t *, cp) {
authority_cert_dl_failed(cp->first, cp->second, status);
tor_free(cp);
} SMARTLIST_FOREACH_END(cp);
} else {
log_warn(LD_DIR,
"Don't know what to do with failure for cert fetch %s",
conn->requested_resource);
}
smartlist_free(failed);
update_certificate_downloads(time(NULL));
}
/** Evaluate the situation and decide if we should use an encrypted
* "begindir-style" connection for this directory request.
* 0) If there is no DirPort, yes.
* 1) If or_port is 0, or it's a direct conn and or_port is firewalled
* or we're a dir mirror, no.
* 2) If we prefer to avoid begindir conns, and we're not fetching or
* publishing a bridge relay descriptor, no.
* 3) Else yes.
* If returning 0, return in *reason why we can't use begindir.
* reason must not be NULL.
*/
static int
directory_command_should_use_begindir(const or_options_t *options,
const directory_request_t *req,
const char **reason)
{
const tor_addr_t *or_addr = &req->or_addr_port.addr;
//const tor_addr_t *dir_addr = &req->dir_addr_port.addr;
const int or_port = req->or_addr_port.port;
const int dir_port = req->dir_addr_port.port;
const dir_indirection_t indirection = req->indirection;
tor_assert(reason);
*reason = NULL;
/* Reasons why we must use begindir */
if (!dir_port) {
*reason = "(using begindir - directory with no DirPort)";
return 1; /* We don't know a DirPort -- must begindir. */
}
/* Reasons why we can't possibly use begindir */
if (!or_port) {
*reason = "directory with unknown ORPort";
return 0; /* We don't know an ORPort -- no chance. */
}
if (indirection == DIRIND_DIRECT_CONN ||
indirection == DIRIND_ANON_DIRPORT) {
*reason = "DirPort connection";
return 0;
}
if (indirection == DIRIND_ONEHOP) {
/* We're firewalled and want a direct OR connection */
if (!fascist_firewall_allows_address_addr(or_addr, or_port,
FIREWALL_OR_CONNECTION, 0, 0)) {
*reason = "ORPort not reachable";
return 0;
}
}
/* Reasons why we want to avoid using begindir */
if (indirection == DIRIND_ONEHOP) {
if (!dirclient_must_use_begindir(options)) {
*reason = "in relay mode";
return 0;
}
}
/* DIRIND_ONEHOP on a client, or DIRIND_ANONYMOUS
*/
*reason = "(using begindir)";
return 1;
}
/**
* Create and return a new directory_request_t with purpose
* <b>dir_purpose</b>.
*/
directory_request_t *
directory_request_new(uint8_t dir_purpose)
{
tor_assert(dir_purpose >= DIR_PURPOSE_MIN_);
tor_assert(dir_purpose <= DIR_PURPOSE_MAX_);
tor_assert(dir_purpose != DIR_PURPOSE_SERVER);
tor_assert(dir_purpose != DIR_PURPOSE_HAS_FETCHED_RENDDESC_V2);
tor_assert(dir_purpose != DIR_PURPOSE_HAS_FETCHED_HSDESC);
directory_request_t *result = tor_malloc_zero(sizeof(*result));
tor_addr_make_null(&result->or_addr_port.addr, AF_INET);
result->or_addr_port.port = 0;
tor_addr_make_null(&result->dir_addr_port.addr, AF_INET);
result->dir_addr_port.port = 0;
result->dir_purpose = dir_purpose;
result->router_purpose = ROUTER_PURPOSE_GENERAL;
result->indirection = DIRIND_ONEHOP;
return result;
}
/**
* Release all resources held by <b>req</b>.
*/
void
directory_request_free_(directory_request_t *req)
{
if (req == NULL)
return;
config_free_lines(req->additional_headers);
tor_free(req);
}
/**
* Set the address and OR port to use for this directory request. If there is
* no OR port, we'll have to connect over the dirport. (If there are both,
* the indirection setting determines which to use.)
*/
void
directory_request_set_or_addr_port(directory_request_t *req,
const tor_addr_port_t *p)
{
memcpy(&req->or_addr_port, p, sizeof(*p));
}
/**
* Set the address and dirport to use for this directory request. If there
* is no dirport, we'll have to connect over the OR port. (If there are both,
* the indirection setting determines which to use.)
*/
void
directory_request_set_dir_addr_port(directory_request_t *req,
const tor_addr_port_t *p)
{
memcpy(&req->dir_addr_port, p, sizeof(*p));
}
/**
* Set the RSA identity digest of the directory to use for this directory
* request.
*/
void
directory_request_set_directory_id_digest(directory_request_t *req,
const char *digest)
{
memcpy(req->digest, digest, DIGEST_LEN);
}
/**
* Set the router purpose associated with uploaded and downloaded router
* descriptors and extrainfo documents in this directory request. The purpose
* must be one of ROUTER_PURPOSE_GENERAL (the default) or
* ROUTER_PURPOSE_BRIDGE.
*/
void
directory_request_set_router_purpose(directory_request_t *req,
uint8_t router_purpose)
{
tor_assert(router_purpose == ROUTER_PURPOSE_GENERAL ||
router_purpose == ROUTER_PURPOSE_BRIDGE);
// assert that it actually makes sense to set this purpose, given
// the dir_purpose.
req->router_purpose = router_purpose;
}
/**
* Set the indirection to be used for the directory request. The indirection
* parameter configures whether to connect to a DirPort or ORPort, and whether
* to anonymize the connection. DIRIND_ONEHOP (use ORPort, don't anonymize)
* is the default. See dir_indirection_t for more information.
*/
void
directory_request_set_indirection(directory_request_t *req,
dir_indirection_t indirection)
{
req->indirection = indirection;
}
/**
* Set a pointer to the resource to request from a directory. Different
* request types use resources to indicate different components of their URL.
* Note that only an alias to <b>resource</b> is stored, so the
* <b>resource</b> must outlive the request.
*/
void
directory_request_set_resource(directory_request_t *req,
const char *resource)
{
req->resource = resource;
}
/**
* Set a pointer to the payload to include with this directory request, along
* with its length. Note that only an alias to <b>payload</b> is stored, so
* the <b>payload</b> must outlive the request.
*/
void
directory_request_set_payload(directory_request_t *req,
const char *payload,
size_t payload_len)
{
tor_assert(DIR_PURPOSE_IS_UPLOAD(req->dir_purpose));
req->payload = payload;
req->payload_len = payload_len;
}
/**
* Set an if-modified-since date to send along with the request. The
* default is 0 (meaning, send no if-modified-since header).
*/
void
directory_request_set_if_modified_since(directory_request_t *req,
time_t if_modified_since)
{
req->if_modified_since = if_modified_since;
}
/** Include a header of name <b>key</b> with content <b>val</b> in the
* request. Neither may include newlines or other odd characters. Their
* ordering is not currently guaranteed.
*
* Note that, as elsewhere in this module, header keys include a trailing
* colon and space.
*/
void
directory_request_add_header(directory_request_t *req,
const char *key,
const char *val)
{
config_line_prepend(&req->additional_headers, key, val);
}
/**
* Set an object containing HS data to be associated with this request. Note
* that only an alias to <b>query</b> is stored, so the <b>query</b> object
* must outlive the request.
*/
void
directory_request_set_rend_query(directory_request_t *req,
const rend_data_t *query)
{
if (query) {
tor_assert(req->dir_purpose == DIR_PURPOSE_FETCH_RENDDESC_V2 ||
req->dir_purpose == DIR_PURPOSE_UPLOAD_RENDDESC_V2);
}
req->rend_query = query;
}
/**
* Set an object containing HS connection identifier to be associated with
* this request. Note that only an alias to <b>ident</b> is stored, so the
* <b>ident</b> object must outlive the request.
*/
void
directory_request_upload_set_hs_ident(directory_request_t *req,
const hs_ident_dir_conn_t *ident)
{
if (ident) {
tor_assert(req->dir_purpose == DIR_PURPOSE_UPLOAD_HSDESC);
}
req->hs_ident = ident;
}
/**
* Set an object containing HS connection identifier to be associated with
* this fetch request. Note that only an alias to <b>ident</b> is stored, so
* the <b>ident</b> object must outlive the request.
*/
void
directory_request_fetch_set_hs_ident(directory_request_t *req,
const hs_ident_dir_conn_t *ident)
{
if (ident) {
tor_assert(req->dir_purpose == DIR_PURPOSE_FETCH_HSDESC);
}
req->hs_ident = ident;
}
/** Set a static circuit_guard_state_t object to affliate with the request in
* <b>req</b>. This object will receive notification when the attempt to
* connect to the guard either succeeds or fails. */
void
directory_request_set_guard_state(directory_request_t *req,
circuit_guard_state_t *state)
{
req->guard_state = state;
}
/**
* Internal: Return true if any information for contacting the directory in
* <b>req</b> has been set, other than by the routerstatus. */
static int
directory_request_dir_contact_info_specified(const directory_request_t *req)
{
/* We only check for ports here, since we don't use an addr unless the port
* is set */
return (req->or_addr_port.port ||
req->dir_addr_port.port ||
! tor_digest_is_zero(req->digest));
}
/**
* Set the routerstatus to use for the directory associated with this
* request. If this option is set, then no other function to set the
* directory's address or identity should be called.
*/
void
directory_request_set_routerstatus(directory_request_t *req,
const routerstatus_t *status)
{
req->routerstatus = status;
}
/**
* Helper: update the addresses, ports, and identities in <b>req</b>
* from the routerstatus object in <b>req</b>. Return 0 on success.
* On failure, warn and return -1.
*/
static int
directory_request_set_dir_from_routerstatus(directory_request_t *req)
{
const routerstatus_t *status = req->routerstatus;
if (BUG(status == NULL))
return -1;
const or_options_t *options = get_options();
const node_t *node;
tor_addr_port_t use_or_ap, use_dir_ap;
const int anonymized_connection = dirind_is_anon(req->indirection);
tor_assert(status != NULL);
node = node_get_by_id(status->identity_digest);
/* XXX The below check is wrong: !node means it's not in the consensus,
* but we haven't checked if we have a descriptor for it -- and also,
* we only care about the descriptor if it's a begindir-style anonymized
* connection. */
if (!node && anonymized_connection) {
log_info(LD_DIR, "Not sending anonymized request to directory '%s'; we "
"don't have its router descriptor.",
routerstatus_describe(status));
return -1;
}
if (options->ExcludeNodes && options->StrictNodes &&
routerset_contains_routerstatus(options->ExcludeNodes, status, -1)) {
log_warn(LD_DIR, "Wanted to contact directory mirror %s for %s, but "
"it's in our ExcludedNodes list and StrictNodes is set. "
"Skipping. This choice might make your Tor not work.",
routerstatus_describe(status),
dir_conn_purpose_to_string(req->dir_purpose));
return -1;
}
/* At this point, if we are a client making a direct connection to a
* directory server, we have selected a server that has at least one address
* allowed by ClientUseIPv4/6 and Reachable{"",OR,Dir}Addresses. This
* selection uses the preference in ClientPreferIPv6{OR,Dir}Port, if
* possible. (If UseBridges is set, clients always use IPv6, and prefer it
* by default.)
*
* Now choose an address that we can use to connect to the directory server.
*/
if (directory_choose_address_routerstatus(status,
req->indirection, &use_or_ap,
&use_dir_ap) < 0) {
return -1;
}
directory_request_set_or_addr_port(req, &use_or_ap);
directory_request_set_dir_addr_port(req, &use_dir_ap);
directory_request_set_directory_id_digest(req, status->identity_digest);
return 0;
}
/**
* Launch the provided directory request, configured in <b>request</b>.
* After this function is called, you can free <b>request</b>.
*/
MOCK_IMPL(void,
directory_initiate_request,(directory_request_t *request))
{
tor_assert(request);
if (request->routerstatus) {
tor_assert_nonfatal(
! directory_request_dir_contact_info_specified(request));
if (directory_request_set_dir_from_routerstatus(request) < 0) {
return;
}
}
const tor_addr_port_t *or_addr_port = &request->or_addr_port;
const tor_addr_port_t *dir_addr_port = &request->dir_addr_port;
const char *digest = request->digest;
const uint8_t dir_purpose = request->dir_purpose;
const uint8_t router_purpose = request->router_purpose;
const dir_indirection_t indirection = request->indirection;
const char *resource = request->resource;
const rend_data_t *rend_query = request->rend_query;
const hs_ident_dir_conn_t *hs_ident = request->hs_ident;
circuit_guard_state_t *guard_state = request->guard_state;
tor_assert(or_addr_port->port || dir_addr_port->port);
tor_assert(digest);
dir_connection_t *conn;
const or_options_t *options = get_options();
int socket_error = 0;
const char *begindir_reason = NULL;
/* Should the connection be to a relay's OR port (and inside that we will
* send our directory request)? */
const int use_begindir =
directory_command_should_use_begindir(options, request, &begindir_reason);
/* Will the connection go via a three-hop Tor circuit? Note that this
* is separate from whether it will use_begindir. */
const int anonymized_connection = dirind_is_anon(indirection);
/* What is the address we want to make the directory request to? If
* we're making a begindir request this is the ORPort of the relay
* we're contacting; if not a begindir request, this is its DirPort.
* Note that if anonymized_connection is true, we won't be initiating
* a connection directly to this address. */
tor_addr_t addr;
tor_addr_copy(&addr, &(use_begindir ? or_addr_port : dir_addr_port)->addr);
uint16_t port = (use_begindir ? or_addr_port : dir_addr_port)->port;
log_debug(LD_DIR, "anonymized %d, use_begindir %d.",
anonymized_connection, use_begindir);
log_debug(LD_DIR, "Initiating %s", dir_conn_purpose_to_string(dir_purpose));
if (purpose_needs_anonymity(dir_purpose, router_purpose, resource)) {
tor_assert(anonymized_connection ||
rend_non_anonymous_mode_enabled(options));
}
/* use encrypted begindir connections for everything except relays
* this provides better protection for directory fetches */
if (!use_begindir && dirclient_must_use_begindir(options)) {
log_warn(LD_BUG, "Client could not use begindir connection: %s",
begindir_reason ? begindir_reason : "(NULL)");
return;
}
/* ensure that we don't make direct connections when a SOCKS server is
* configured. */
if (!anonymized_connection && !use_begindir && !options->HTTPProxy &&
(options->Socks4Proxy || options->Socks5Proxy)) {
log_warn(LD_DIR, "Cannot connect to a directory server through a "
"SOCKS proxy!");
return;
}
/* Make sure that the destination addr and port we picked is viable. */
if (!port || tor_addr_is_null(&addr)) {
static int logged_backtrace = 0;
log_warn(LD_DIR,
"Cannot make an outgoing %sconnection without a remote %sPort.",
use_begindir ? "begindir " : "",
use_begindir ? "OR" : "Dir");
if (!logged_backtrace) {
log_backtrace(LOG_INFO, LD_BUG, "Address came from");
logged_backtrace = 1;
}
return;
}
conn = dir_connection_new(tor_addr_family(&addr));
/* set up conn so it's got all the data we need to remember */
tor_addr_copy(&conn->base_.addr, &addr);
conn->base_.port = port;
conn->base_.address = tor_addr_to_str_dup(&addr);
memcpy(conn->identity_digest, digest, DIGEST_LEN);
conn->base_.purpose = dir_purpose;
conn->router_purpose = router_purpose;
/* give it an initial state */
conn->base_.state = DIR_CONN_STATE_CONNECTING;
/* decide whether we can learn our IP address from this conn */
/* XXXX This is a bad name for this field now. */
conn->dirconn_direct = !anonymized_connection;
/* copy rendezvous data, if any */
if (rend_query) {
/* We can't have both v2 and v3+ identifier. */
tor_assert_nonfatal(!hs_ident);
conn->rend_data = rend_data_dup(rend_query);
}
if (hs_ident) {
/* We can't have both v2 and v3+ identifier. */
tor_assert_nonfatal(!rend_query);
conn->hs_ident = hs_ident_dir_conn_dup(hs_ident);
}
if (!anonymized_connection && !use_begindir) {
/* then we want to connect to dirport directly */
if (options->HTTPProxy) {
tor_addr_copy(&addr, &options->HTTPProxyAddr);
port = options->HTTPProxyPort;
}
// In this case we should not have picked a directory guard.
if (BUG(guard_state)) {
entry_guard_cancel(&guard_state);
}
switch (connection_connect(TO_CONN(conn), conn->base_.address, &addr,
port, &socket_error)) {
case -1:
connection_mark_for_close(TO_CONN(conn));
return;
case 1:
/* start flushing conn */
conn->base_.state = DIR_CONN_STATE_CLIENT_SENDING;
FALLTHROUGH;
case 0:
/* queue the command on the outbuf */
directory_send_command(conn, 1, request);
connection_watch_events(TO_CONN(conn), READ_EVENT | WRITE_EVENT);
/* writable indicates finish, readable indicates broken link,
error indicates broken link in windowsland. */
}
} else {
/* We will use a Tor circuit (maybe 1-hop, maybe 3-hop, maybe with
* begindir, maybe not with begindir) */
entry_connection_t *linked_conn;
/* Anonymized tunneled connections can never share a circuit.
* One-hop directory connections can share circuits with each other
* but nothing else. */
int iso_flags = anonymized_connection ? ISO_STREAM : ISO_SESSIONGRP;
/* If it's an anonymized connection, remember the fact that we
* wanted it for later: maybe we'll want it again soon. */
if (anonymized_connection && use_begindir)
rep_hist_note_used_internal(time(NULL), 0, 1);
else if (anonymized_connection && !use_begindir)
rep_hist_note_used_port(time(NULL), conn->base_.port);
// In this case we should not have a directory guard; we'll
// get a regular guard later when we build the circuit.
if (BUG(anonymized_connection && guard_state)) {
entry_guard_cancel(&guard_state);
}
conn->guard_state = guard_state;
/* make an AP connection
* populate it and add it at the right state
* hook up both sides
*/
linked_conn =
connection_ap_make_link(TO_CONN(conn),
conn->base_.address, conn->base_.port,
digest,
SESSION_GROUP_DIRCONN, iso_flags,
use_begindir, !anonymized_connection);
if (!linked_conn) {
log_warn(LD_NET,"Making tunnel to dirserver failed.");
connection_mark_for_close(TO_CONN(conn));
return;
}
if (connection_add(TO_CONN(conn)) < 0) {
log_warn(LD_NET,"Unable to add connection for link to dirserver.");
connection_mark_for_close(TO_CONN(conn));
return;
}
conn->base_.state = DIR_CONN_STATE_CLIENT_SENDING;
/* queue the command on the outbuf */
directory_send_command(conn, 0, request);
connection_watch_events(TO_CONN(conn), READ_EVENT|WRITE_EVENT);
connection_start_reading(ENTRY_TO_CONN(linked_conn));
}
}
/** Helper for sorting
*
* sort strings alphabetically
*
* XXXX we have a smartlist_sort_strings() function, right?
*/
static int
compare_strs_(const void **a, const void **b)
{
const char *s1 = *a, *s2 = *b;
return strcmp(s1, s2);
}
#define CONDITIONAL_CONSENSUS_FPR_LEN 3
CTASSERT(CONDITIONAL_CONSENSUS_FPR_LEN <= DIGEST_LEN);
/** Return the URL we should use for a consensus download.
*
* Use the "conditional consensus downloading" feature described in
* dir-spec.txt, i.e.
* GET .../consensus/<b>fpr</b>+<b>fpr</b>+<b>fpr</b>
*
* If 'resource' is provided, it is the name of a consensus flavor to request.
*/
static char *
directory_get_consensus_url(const char *resource)
{
char *url = NULL;
const char *hyphen, *flavor;
if (resource==NULL || strcmp(resource, "ns")==0) {
flavor = ""; /* Request ns consensuses as "", so older servers will work*/
hyphen = "";
} else {
flavor = resource;
hyphen = "-";
}
{
char *authority_id_list;
smartlist_t *authority_digests = smartlist_new();
SMARTLIST_FOREACH_BEGIN(router_get_trusted_dir_servers(),
dir_server_t *, ds) {
char *hex;
if (!(ds->type & V3_DIRINFO))
continue;
hex = tor_malloc(2*CONDITIONAL_CONSENSUS_FPR_LEN+1);
base16_encode(hex, 2*CONDITIONAL_CONSENSUS_FPR_LEN+1,
ds->v3_identity_digest, CONDITIONAL_CONSENSUS_FPR_LEN);
smartlist_add(authority_digests, hex);
} SMARTLIST_FOREACH_END(ds);
smartlist_sort(authority_digests, compare_strs_);
authority_id_list = smartlist_join_strings(authority_digests,
"+", 0, NULL);
tor_asprintf(&url, "/tor/status-vote/current/consensus%s%s/%s.z",
hyphen, flavor, authority_id_list);
SMARTLIST_FOREACH(authority_digests, char *, cp, tor_free(cp));
smartlist_free(authority_digests);
tor_free(authority_id_list);
}
return url;
}
/**
* Copies the ipv6 from source to destination, subject to buffer size limit
* size. If decorate is true, makes sure the copied address is decorated.
*/
static void
copy_ipv6_address(char* destination, const char* source, size_t len,
int decorate) {
tor_assert(destination);
tor_assert(source);
if (decorate && source[0] != '[') {
tor_snprintf(destination, len, "[%s]", source);
} else {
strlcpy(destination, source, len);
}
}
/** Queue an appropriate HTTP command for <b>request</b> on
* <b>conn</b>-\>outbuf. If <b>direct</b> is true, we're making a
* non-anonymized connection to the dirport.
*/
static void
directory_send_command(dir_connection_t *conn,
const int direct,
const directory_request_t *req)
{
tor_assert(req);
const int purpose = req->dir_purpose;
const char *resource = req->resource;
const char *payload = req->payload;
const size_t payload_len = req->payload_len;
const time_t if_modified_since = req->if_modified_since;
const int anonymized_connection = dirind_is_anon(req->indirection);
char proxystring[256];
char hoststring[128];
/* NEEDS to be the same size hoststring.
Will be decorated with brackets around it if it is ipv6. */
char decorated_address[128];
smartlist_t *headers = smartlist_new();
char *url;
char *accept_encoding;
size_t url_len;
char request[8192];
size_t request_len, total_request_len = 0;
const char *httpcommand = NULL;
tor_assert(conn);
tor_assert(conn->base_.type == CONN_TYPE_DIR);
tor_free(conn->requested_resource);
if (resource)
conn->requested_resource = tor_strdup(resource);
/* decorate the ip address if it is ipv6 */
if (strchr(conn->base_.address, ':')) {
copy_ipv6_address(decorated_address, conn->base_.address,
sizeof(decorated_address), 1);
} else {
strlcpy(decorated_address, conn->base_.address, sizeof(decorated_address));
}
/* come up with a string for which Host: we want */
if (conn->base_.port == 80) {
strlcpy(hoststring, decorated_address, sizeof(hoststring));
} else {
tor_snprintf(hoststring, sizeof(hoststring), "%s:%d",
decorated_address, conn->base_.port);
}
/* Format if-modified-since */
if (if_modified_since) {
char b[RFC1123_TIME_LEN+1];
format_rfc1123_time(b, if_modified_since);
smartlist_add_asprintf(headers, "If-Modified-Since: %s\r\n", b);
}
/* come up with some proxy lines, if we're using one. */
if (direct && get_options()->HTTPProxy) {
char *base64_authenticator=NULL;
const char *authenticator = get_options()->HTTPProxyAuthenticator;
tor_snprintf(proxystring, sizeof(proxystring),"http://%s", hoststring);
if (authenticator) {
base64_authenticator = alloc_http_authenticator(authenticator);
if (!base64_authenticator)
log_warn(LD_BUG, "Encoding http authenticator failed");
}
if (base64_authenticator) {
smartlist_add_asprintf(headers,
"Proxy-Authorization: Basic %s\r\n",
base64_authenticator);
tor_free(base64_authenticator);
}
} else {
proxystring[0] = 0;
}
if (! anonymized_connection) {
/* Add Accept-Encoding. */
accept_encoding = accept_encoding_header();
smartlist_add_asprintf(headers, "Accept-Encoding: %s\r\n",
accept_encoding);
tor_free(accept_encoding);
}
/* Add additional headers, if any */
{
config_line_t *h;
for (h = req->additional_headers; h; h = h->next) {
smartlist_add_asprintf(headers, "%s%s\r\n", h->key, h->value);
}
}
switch (purpose) {
case DIR_PURPOSE_FETCH_CONSENSUS:
/* resource is optional. If present, it's a flavor name */
tor_assert(!payload);
httpcommand = "GET";
url = directory_get_consensus_url(resource);
log_info(LD_DIR, "Downloading consensus from %s using %s",
hoststring, url);
break;
case DIR_PURPOSE_FETCH_CERTIFICATE:
tor_assert(resource);
tor_assert(!payload);
httpcommand = "GET";
tor_asprintf(&url, "/tor/keys/%s", resource);
break;
case DIR_PURPOSE_FETCH_STATUS_VOTE:
tor_assert(resource);
tor_assert(!payload);
httpcommand = "GET";
tor_asprintf(&url, "/tor/status-vote/next/%s.z", resource);
break;
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES:
tor_assert(!resource);
tor_assert(!payload);
httpcommand = "GET";
url = tor_strdup("/tor/status-vote/next/consensus-signatures.z");
break;
case DIR_PURPOSE_FETCH_SERVERDESC:
tor_assert(resource);
httpcommand = "GET";
tor_asprintf(&url, "/tor/server/%s", resource);
break;
case DIR_PURPOSE_FETCH_EXTRAINFO:
tor_assert(resource);
httpcommand = "GET";
tor_asprintf(&url, "/tor/extra/%s", resource);
break;
case DIR_PURPOSE_FETCH_MICRODESC:
tor_assert(resource);
httpcommand = "GET";
tor_asprintf(&url, "/tor/micro/%s", resource);
break;
case DIR_PURPOSE_UPLOAD_DIR: {
const char *why = router_get_descriptor_gen_reason();
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/");
if (!why) {
why = "for no reason at all";
}
smartlist_add_asprintf(headers, "X-Desc-Gen-Reason: %s\r\n", why);
break;
}
case DIR_PURPOSE_UPLOAD_VOTE:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/post/vote");
break;
case DIR_PURPOSE_UPLOAD_SIGNATURES:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/post/consensus-signature");
break;
case DIR_PURPOSE_FETCH_RENDDESC_V2:
tor_assert(resource);
tor_assert(strlen(resource) <= REND_DESC_ID_V2_LEN_BASE32);
tor_assert(!payload);
httpcommand = "GET";
tor_asprintf(&url, "/tor/rendezvous2/%s", resource);
break;
case DIR_PURPOSE_FETCH_HSDESC:
tor_assert(resource);
tor_assert(strlen(resource) <= ED25519_BASE64_LEN);
tor_assert(!payload);
httpcommand = "GET";
tor_asprintf(&url, "/tor/hs/3/%s", resource);
break;
case DIR_PURPOSE_UPLOAD_RENDDESC_V2:
tor_assert(!resource);
tor_assert(payload);
httpcommand = "POST";
url = tor_strdup("/tor/rendezvous2/publish");
break;
case DIR_PURPOSE_UPLOAD_HSDESC:
tor_assert(resource);
tor_assert(payload);
httpcommand = "POST";
tor_asprintf(&url, "/tor/hs/%s/publish", resource);
break;
default:
tor_assert(0);
return;
}
/* warn in the non-tunneled case */
if (direct && (strlen(proxystring) + strlen(url) >= 4096)) {
log_warn(LD_BUG,
"Squid does not like URLs longer than 4095 bytes, and this "
"one is %d bytes long: %s%s",
(int)(strlen(proxystring) + strlen(url)), proxystring, url);
}
tor_snprintf(request, sizeof(request), "%s %s", httpcommand, proxystring);
request_len = strlen(request);
total_request_len += request_len;
connection_buf_add(request, request_len, TO_CONN(conn));
url_len = strlen(url);
total_request_len += url_len;
connection_buf_add(url, url_len, TO_CONN(conn));
tor_free(url);
if (!strcmp(httpcommand, "POST") || payload) {
smartlist_add_asprintf(headers, "Content-Length: %lu\r\n",
payload ? (unsigned long)payload_len : 0);
}
{
char *header = smartlist_join_strings(headers, "", 0, NULL);
tor_snprintf(request, sizeof(request), " HTTP/1.0\r\nHost: %s\r\n%s\r\n",
hoststring, header);
tor_free(header);
}
request_len = strlen(request);
total_request_len += request_len;
connection_buf_add(request, request_len, TO_CONN(conn));
if (payload) {
/* then send the payload afterwards too */
connection_buf_add(payload, payload_len, TO_CONN(conn));
total_request_len += payload_len;
}
SMARTLIST_FOREACH(headers, char *, h, tor_free(h));
smartlist_free(headers);
log_debug(LD_DIR,
"Sent request to directory server '%s:%d': "
"(purpose: %d, request size: %"TOR_PRIuSZ", "
"payload size: %"TOR_PRIuSZ")",
conn->base_.address, conn->base_.port,
conn->base_.purpose,
(total_request_len),
(payload ? payload_len : 0));
}
/** Return true iff <b>body</b> doesn't start with a plausible router or
* network-status or microdescriptor opening. This is a sign of possible
* compression. */
static int
body_is_plausible(const char *body, size_t len, int purpose)
{
int i;
if (len == 0)
return 1; /* empty bodies don't need decompression */
if (len < 32)
return 0;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
return (!strcmpstart(body,"onion-key"));
}
if (!strcmpstart(body,"router") ||
!strcmpstart(body,"network-status"))
return 1;
for (i=0;i<32;++i) {
if (!TOR_ISPRINT(body[i]) && !TOR_ISSPACE(body[i]))
return 0;
}
return 1;
}
/** Called when we've just fetched a bunch of router descriptors in
* <b>body</b>. The list <b>which</b>, if present, holds digests for
* descriptors we requested: descriptor digests if <b>descriptor_digests</b>
* is true, or identity digests otherwise. Parse the descriptors, validate
* them, and annotate them as having purpose <b>purpose</b> and as having been
* downloaded from <b>source</b>.
*
* Return the number of routers actually added. */
static int
load_downloaded_routers(const char *body, smartlist_t *which,
int descriptor_digests,
int router_purpose,
const char *source)
{
char buf[256];
char time_buf[ISO_TIME_LEN+1];
int added = 0;
int general = router_purpose == ROUTER_PURPOSE_GENERAL;
format_iso_time(time_buf, time(NULL));
tor_assert(source);
if (tor_snprintf(buf, sizeof(buf),
"@downloaded-at %s\n"
"@source %s\n"
"%s%s%s", time_buf, escaped(source),
!general ? "@purpose " : "",
!general ? router_purpose_to_string(router_purpose) : "",
!general ? "\n" : "")<0)
return added;
added = router_load_routers_from_string(body, NULL, SAVED_NOWHERE, which,
descriptor_digests, buf);
if (added && general)
control_event_boot_dir(BOOTSTRAP_STATUS_LOADING_DESCRIPTORS,
count_loading_descriptors_progress());
return added;
}
static int handle_response_fetch_certificate(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_fetch_status_vote(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_fetch_detached_signatures(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_fetch_desc(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_upload_dir(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_upload_vote(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_upload_signatures(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_fetch_renddesc_v2(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_upload_renddesc_v2(dir_connection_t *,
const response_handler_args_t *);
static int handle_response_upload_hsdesc(dir_connection_t *,
const response_handler_args_t *);
static int
dir_client_decompress_response_body(char **bodyp, size_t *bodylenp,
dir_connection_t *conn,
compress_method_t compression,
int anonymized_connection)
{
int rv = 0;
const char *body = *bodyp;
size_t body_len = *bodylenp;
int allow_partial = (conn->base_.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->base_.purpose == DIR_PURPOSE_FETCH_EXTRAINFO ||
conn->base_.purpose == DIR_PURPOSE_FETCH_MICRODESC);
int plausible = body_is_plausible(body, body_len, conn->base_.purpose);
if (plausible && compression == NO_METHOD) {
return 0;
}
int severity = LOG_DEBUG;
char *new_body = NULL;
size_t new_len = 0;
const char *description1, *description2;
int want_to_try_both = 0;
int tried_both = 0;
compress_method_t guessed = detect_compression_method(body, body_len);
description1 = compression_method_get_human_name(compression);
if (BUG(description1 == NULL))
description1 = compression_method_get_human_name(UNKNOWN_METHOD);
if (guessed == UNKNOWN_METHOD && !plausible)
description2 = "confusing binary junk";
else
description2 = compression_method_get_human_name(guessed);
/* Tell the user if we don't believe what we're told about compression.*/
want_to_try_both = (compression == UNKNOWN_METHOD ||
guessed != compression);
if (want_to_try_both) {
severity = LOG_PROTOCOL_WARN;
}
tor_log(severity, LD_HTTP,
"HTTP body from server '%s:%d' was labeled as %s, "
"%s it seems to be %s.%s",
conn->base_.address, conn->base_.port, description1,
guessed != compression?"but":"and",
description2,
(compression>0 && guessed>0 && want_to_try_both)?
" Trying both.":"");
/* Try declared compression first if we can.
* tor_compress_supports_method() also returns true for NO_METHOD.
* Ensure that the server is not sending us data compressed using a
* compression method that is not allowed for anonymous connections. */
if (anonymized_connection &&
! allowed_anonymous_connection_compression_method(compression)) {
warn_disallowed_anonymous_compression_method(compression);
rv = -1;
goto done;
}
if (tor_compress_supports_method(compression)) {
tor_uncompress(&new_body, &new_len, body, body_len, compression,
!allow_partial, LOG_PROTOCOL_WARN);
if (new_body) {
/* We succeeded with the declared compression method. Great! */
rv = 0;
goto done;
}
}
/* Okay, if that didn't work, and we think that it was compressed
* differently, try that. */
if (anonymized_connection &&
! allowed_anonymous_connection_compression_method(guessed)) {
warn_disallowed_anonymous_compression_method(guessed);
rv = -1;
goto done;
}
if (tor_compress_supports_method(guessed) &&
compression != guessed) {
tor_uncompress(&new_body, &new_len, body, body_len, guessed,
!allow_partial, LOG_INFO);
tried_both = 1;
}
/* If we're pretty sure that we have a compressed directory, and
* we didn't manage to uncompress it, then warn and bail. */
if (!plausible && !new_body) {
log_fn(LOG_PROTOCOL_WARN, LD_HTTP,
"Unable to decompress HTTP body (tried %s%s%s, server '%s:%d').",
description1,
tried_both?" and ":"",
tried_both?description2:"",
conn->base_.address, conn->base_.port);
rv = -1;
goto done;
}
done:
if (new_body) {
if (rv == 0) {
/* success! */
tor_free(*bodyp);
*bodyp = new_body;
*bodylenp = new_len;
} else {
tor_free(new_body);
}
}
return rv;
}
/**
* Total number of bytes downloaded of each directory purpose, when
* bootstrapped, and when not bootstrapped.
*
* (For example, the number of bytes downloaded of purpose p while
* not fully bootstrapped is total_dl[p][false].)
**/
static uint64_t total_dl[DIR_PURPOSE_MAX_][2];
/**
* Heartbeat: dump a summary of how many bytes of which purpose we've
* downloaded, when bootstrapping and when not bootstrapping.
**/
void
dirclient_dump_total_dls(void)
{
const or_options_t *options = get_options();
for (int bootstrapped = 0; bootstrapped < 2; ++bootstrapped) {
bool first_time = true;
for (int i=0; i < DIR_PURPOSE_MAX_; ++i) {
uint64_t n = total_dl[i][bootstrapped];
if (n == 0)
continue;
if (options->SafeLogging_ != SAFELOG_SCRUB_NONE &&
purpose_needs_anonymity(i, ROUTER_PURPOSE_GENERAL, NULL))
continue;
if (first_time) {
log_notice(LD_NET,
"While %sbootstrapping, fetched this many bytes: ",
bootstrapped?"not ":"");
first_time = false;
}
log_notice(LD_NET, " %"PRIu64" (%s)",
n, dir_conn_purpose_to_string(i));
}
}
}
/** We are a client, and we've finished reading the server's
* response. Parse it and act appropriately.
*
* If we're still happy with using this directory server in the future, return
* 0. Otherwise return -1; and the caller should consider trying the request
* again.
*
* The caller will take care of marking the connection for close.
*/
static int
connection_dir_client_reached_eof(dir_connection_t *conn)
{
char *body = NULL;
char *headers = NULL;
char *reason = NULL;
size_t body_len = 0;
int status_code;
time_t date_header = 0;
long apparent_skew;
compress_method_t compression;
int skewed = 0;
int rv;
int allow_partial = (conn->base_.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->base_.purpose == DIR_PURPOSE_FETCH_EXTRAINFO ||
conn->base_.purpose == DIR_PURPOSE_FETCH_MICRODESC);
size_t received_bytes;
const int anonymized_connection =
purpose_needs_anonymity(conn->base_.purpose,
conn->router_purpose,
conn->requested_resource);
received_bytes = connection_get_inbuf_len(TO_CONN(conn));
log_debug(LD_DIR, "Downloaded %"TOR_PRIuSZ" bytes on connection of purpose "
"%s; bootstrap %d%%",
received_bytes,
dir_conn_purpose_to_string(conn->base_.purpose),
control_get_bootstrap_percent());
{
bool bootstrapped = control_get_bootstrap_percent() == 100;
total_dl[conn->base_.purpose][bootstrapped] += received_bytes;
}
switch (connection_fetch_from_buf_http(TO_CONN(conn),
&headers, MAX_HEADERS_SIZE,
&body, &body_len, MAX_DIR_DL_SIZE,
allow_partial)) {
case -1: /* overflow */
log_warn(LD_PROTOCOL,
"'fetch' response too large (server '%s:%d'). Closing.",
conn->base_.address, conn->base_.port);
return -1;
case 0:
log_info(LD_HTTP,
"'fetch' response not all here, but we're at eof. Closing.");
return -1;
/* case 1, fall through */
}
if (parse_http_response(headers, &status_code, &date_header,
&compression, &reason) < 0) {
log_warn(LD_HTTP,"Unparseable headers (server '%s:%d'). Closing.",
conn->base_.address, conn->base_.port);
rv = -1;
goto done;
}
if (!reason) reason = tor_strdup("[no reason given]");
tor_log(LOG_DEBUG, LD_DIR,
"Received response from directory server '%s:%d': %d %s "
"(purpose: %d, response size: %"TOR_PRIuSZ
#ifdef MEASUREMENTS_21206
", data cells received: %d, data cells sent: %d"
#endif
", compression: %d)",
conn->base_.address, conn->base_.port, status_code,
escaped(reason), conn->base_.purpose,
(received_bytes),
#ifdef MEASUREMENTS_21206
conn->data_cells_received, conn->data_cells_sent,
#endif
compression);
if (conn->guard_state) {
/* we count the connection as successful once we can read from it. We do
* not, however, delay use of the circuit here, since it's just for a
* one-hop directory request. */
/* XXXXprop271 note that this will not do the right thing for other
* waiting circuits that would be triggered by this circuit becoming
* complete/usable. But that's ok, I think.
*/
entry_guard_succeeded(&conn->guard_state);
circuit_guard_state_free(conn->guard_state);
conn->guard_state = NULL;
}
/* now check if it's got any hints for us about our IP address. */
if (conn->dirconn_direct) {
char *guess = http_get_header(headers, X_ADDRESS_HEADER);
if (guess) {
router_new_address_suggestion(guess, conn);
tor_free(guess);
}
}
if (date_header > 0) {
/* The date header was written very soon after we sent our request,
* so compute the skew as the difference between sending the request
* and the date header. (We used to check now-date_header, but that's
* inaccurate if we spend a lot of time downloading.)
*/
apparent_skew = conn->base_.timestamp_last_write_allowed - date_header;
if (labs(apparent_skew)>ALLOW_DIRECTORY_TIME_SKEW) {
int trusted = router_digest_is_trusted_dir(conn->identity_digest);
clock_skew_warning(TO_CONN(conn), apparent_skew, trusted, LD_HTTP,
"directory", "DIRSERV");
skewed = 1; /* don't check the recommended-versions line */
} else {
log_debug(LD_HTTP, "Time on received directory is within tolerance; "
"we are %ld seconds skewed. (That's okay.)", apparent_skew);
}
}
(void) skewed; /* skewed isn't used yet. */
if (status_code == 503) {
routerstatus_t *rs;
dir_server_t *ds;
const char *id_digest = conn->identity_digest;
log_info(LD_DIR,"Received http status code %d (%s) from server "
"'%s:%d'. I'll try again soon.",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
time_t now = approx_time();
if ((rs = router_get_mutable_consensus_status_by_id(id_digest)))
rs->last_dir_503_at = now;
if ((ds = router_get_fallback_dirserver_by_digest(id_digest)))
ds->fake_status.last_dir_503_at = now;
rv = -1;
goto done;
}
if (dir_client_decompress_response_body(&body, &body_len,
conn, compression, anonymized_connection) < 0) {
rv = -1;
goto done;
}
response_handler_args_t args;
memset(&args, 0, sizeof(args));
args.status_code = status_code;
args.reason = reason;
args.body = body;
args.body_len = body_len;
args.headers = headers;
switch (conn->base_.purpose) {
case DIR_PURPOSE_FETCH_CONSENSUS:
rv = handle_response_fetch_consensus(conn, &args);
break;
case DIR_PURPOSE_FETCH_CERTIFICATE:
rv = handle_response_fetch_certificate(conn, &args);
break;
case DIR_PURPOSE_FETCH_STATUS_VOTE:
rv = handle_response_fetch_status_vote(conn, &args);
break;
case DIR_PURPOSE_FETCH_DETACHED_SIGNATURES:
rv = handle_response_fetch_detached_signatures(conn, &args);
break;
case DIR_PURPOSE_FETCH_SERVERDESC:
case DIR_PURPOSE_FETCH_EXTRAINFO:
rv = handle_response_fetch_desc(conn, &args);
break;
case DIR_PURPOSE_FETCH_MICRODESC:
rv = handle_response_fetch_microdesc(conn, &args);
break;
case DIR_PURPOSE_FETCH_RENDDESC_V2:
rv = handle_response_fetch_renddesc_v2(conn, &args);
break;
case DIR_PURPOSE_UPLOAD_DIR:
rv = handle_response_upload_dir(conn, &args);
break;
case DIR_PURPOSE_UPLOAD_SIGNATURES:
rv = handle_response_upload_signatures(conn, &args);
break;
case DIR_PURPOSE_UPLOAD_VOTE:
rv = handle_response_upload_vote(conn, &args);
break;
case DIR_PURPOSE_UPLOAD_RENDDESC_V2:
rv = handle_response_upload_renddesc_v2(conn, &args);
break;
case DIR_PURPOSE_UPLOAD_HSDESC:
rv = handle_response_upload_hsdesc(conn, &args);
break;
case DIR_PURPOSE_FETCH_HSDESC:
rv = handle_response_fetch_hsdesc_v3(conn, &args);
break;
default:
tor_assert_nonfatal_unreached();
rv = -1;
break;
}
done:
tor_free(body);
tor_free(headers);
tor_free(reason);
return rv;
}
/**
* Handler function: processes a response to a request for a networkstatus
* consensus document by checking the consensus, storing it, and marking
* router requests as reachable.
**/
STATIC int
handle_response_fetch_consensus(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_CONSENSUS);
const int status_code = args->status_code;
const char *body = args->body;
const size_t body_len = args->body_len;
const char *reason = args->reason;
const time_t now = approx_time();
const char *consensus;
char *new_consensus = NULL;
const char *sourcename;
int r;
const char *flavname = conn->requested_resource;
if (status_code != 200) {
int severity = (status_code == 304) ? LOG_INFO : LOG_WARN;
tor_log(severity, LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching consensus directory.",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
networkstatus_consensus_download_failed(status_code, flavname);
return -1;
}
if (looks_like_a_consensus_diff(body, body_len)) {
/* First find our previous consensus. Maybe it's in ram, maybe not. */
cached_dir_t *cd = dirserv_get_consensus(flavname);
const char *consensus_body = NULL;
size_t consensus_body_len;
tor_mmap_t *mapped_consensus = NULL;
if (cd) {
consensus_body = cd->dir;
consensus_body_len = cd->dir_len;
} else {
mapped_consensus = networkstatus_map_cached_consensus(flavname);
if (mapped_consensus) {
consensus_body = mapped_consensus->data;
consensus_body_len = mapped_consensus->size;
}
}
if (!consensus_body) {
log_warn(LD_DIR, "Received a consensus diff, but we can't find "
"any %s-flavored consensus in our current cache.",flavname);
tor_munmap_file(mapped_consensus);
networkstatus_consensus_download_failed(0, flavname);
// XXXX if this happens too much, see below
return -1;
}
new_consensus = consensus_diff_apply(consensus_body, consensus_body_len,
body, body_len);
tor_munmap_file(mapped_consensus);
if (new_consensus == NULL) {
log_warn(LD_DIR, "Could not apply consensus diff received from server "
"'%s:%d'", conn->base_.address, conn->base_.port);
// XXXX If this happens too many times, we should maybe not use
// XXXX this directory for diffs any more?
networkstatus_consensus_download_failed(0, flavname);
return -1;
}
log_info(LD_DIR, "Applied consensus diff (size %d) from server "
"'%s:%d', resulting in a new consensus document (size %d).",
(int)body_len, conn->base_.address, conn->base_.port,
(int)strlen(new_consensus));
consensus = new_consensus;
sourcename = "generated based on a diff";
} else {
log_info(LD_DIR,"Received consensus directory (body size %d) from server "
"'%s:%d'", (int)body_len, conn->base_.address, conn->base_.port);
consensus = body;
sourcename = "downloaded";
}
if ((r=networkstatus_set_current_consensus(consensus,
strlen(consensus),
flavname, 0,
conn->identity_digest))<0) {
log_fn(r<-1?LOG_WARN:LOG_INFO, LD_DIR,
"Unable to load %s consensus directory %s from "
"server '%s:%d'. I'll try again soon.",
flavname, sourcename, conn->base_.address, conn->base_.port);
networkstatus_consensus_download_failed(0, flavname);
tor_free(new_consensus);
return -1;
}
/* If we launched other fetches for this consensus, cancel them. */
connection_dir_close_consensus_fetches(conn, flavname);
/* update the list of routers and directory guards */
routers_update_all_from_networkstatus(now, 3);
update_microdescs_from_networkstatus(now);
directory_info_has_arrived(now, 0, 0);
if (authdir_mode_v3(get_options())) {
sr_act_post_consensus(
networkstatus_get_latest_consensus_by_flavor(FLAV_NS));
}
log_info(LD_DIR, "Successfully loaded consensus.");
tor_free(new_consensus);
return 0;
}
/**
* Handler function: processes a response to a request for one or more
* authority certificates
**/
static int
handle_response_fetch_certificate(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_CERTIFICATE);
const int status_code = args->status_code;
const char *reason = args->reason;
const char *body = args->body;
const size_t body_len = args->body_len;
if (status_code != 200) {
log_warn(LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/keys/%s\".",
status_code, escaped(reason), conn->base_.address,
conn->base_.port, conn->requested_resource);
connection_dir_download_cert_failed(conn, status_code);
return -1;
}
log_info(LD_DIR,"Received authority certificates (body size %d) from "
"server '%s:%d'",
(int)body_len, conn->base_.address, conn->base_.port);
/*
* Tell trusted_dirs_load_certs_from_string() whether it was by fp
* or fp-sk pair.
*/
int src_code = -1;
if (!strcmpstart(conn->requested_resource, "fp/")) {
src_code = TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST;
} else if (!strcmpstart(conn->requested_resource, "fp-sk/")) {
src_code = TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST;
}
if (src_code != -1) {
if (trusted_dirs_load_certs_from_string(body, src_code, 1,
conn->identity_digest)<0) {
log_warn(LD_DIR, "Unable to parse fetched certificates");
/* if we fetched more than one and only some failed, the successful
* ones got flushed to disk so it's safe to call this on them */
connection_dir_download_cert_failed(conn, status_code);
} else {
time_t now = approx_time();
directory_info_has_arrived(now, 0, 0);
log_info(LD_DIR, "Successfully loaded certificates from fetch.");
}
} else {
log_warn(LD_DIR,
"Couldn't figure out what to do with fetched certificates for "
"unknown resource %s",
conn->requested_resource);
connection_dir_download_cert_failed(conn, status_code);
}
return 0;
}
/**
* Handler function: processes a response to a request for an authority's
* current networkstatus vote.
**/
static int
handle_response_fetch_status_vote(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_STATUS_VOTE);
const int status_code = args->status_code;
const char *reason = args->reason;
const char *body = args->body;
const size_t body_len = args->body_len;
const char *msg;
int st;
log_info(LD_DIR,"Got votes (body size %d) from server %s:%d",
(int)body_len, conn->base_.address, conn->base_.port);
if (status_code != 200) {
log_warn(LD_DIR,
"Received http status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/status-vote/next/%s.z\".",
status_code, escaped(reason), conn->base_.address,
conn->base_.port, conn->requested_resource);
return -1;
}
dirvote_add_vote(body, 0, &msg, &st);
if (st > 299) {
log_warn(LD_DIR, "Error adding retrieved vote: %s", msg);
} else {
log_info(LD_DIR, "Added vote(s) successfully [msg: %s]", msg);
}
return 0;
}
/**
* Handler function: processes a response to a request for the signatures
* that an authority knows about on a given consensus.
**/
static int
handle_response_fetch_detached_signatures(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_DETACHED_SIGNATURES);
const int status_code = args->status_code;
const char *reason = args->reason;
const char *body = args->body;
const size_t body_len = args->body_len;
const char *msg = NULL;
log_info(LD_DIR,"Got detached signatures (body size %d) from server %s:%d",
(int)body_len, conn->base_.address, conn->base_.port);
if (status_code != 200) {
log_warn(LD_DIR,
"Received http status code %d (%s) from server '%s:%d' while fetching "
"\"/tor/status-vote/next/consensus-signatures.z\".",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
return -1;
}
if (dirvote_add_signatures(body, conn->base_.address, &msg)<0) {
log_warn(LD_DIR, "Problem adding detached signatures from %s:%d: %s",
conn->base_.address, conn->base_.port, msg?msg:"???");
}
return 0;
}
/**
* Handler function: processes a response to a request for a group of server
* descriptors or an extrainfo documents.
**/
static int
handle_response_fetch_desc(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_SERVERDESC ||
conn->base_.purpose == DIR_PURPOSE_FETCH_EXTRAINFO);
const int status_code = args->status_code;
const char *reason = args->reason;
const char *body = args->body;
const size_t body_len = args->body_len;
int was_ei = conn->base_.purpose == DIR_PURPOSE_FETCH_EXTRAINFO;
smartlist_t *which = NULL;
int n_asked_for = 0;
int descriptor_digests = conn->requested_resource &&
!strcmpstart(conn->requested_resource,"d/");
log_info(LD_DIR,"Received %s (body size %d) from server '%s:%d'",
was_ei ? "extra server info" : "server info",
(int)body_len, conn->base_.address, conn->base_.port);
if (conn->requested_resource &&
(!strcmpstart(conn->requested_resource,"d/") ||
!strcmpstart(conn->requested_resource,"fp/"))) {
which = smartlist_new();
dir_split_resource_into_fingerprints(conn->requested_resource +
(descriptor_digests ? 2 : 3),
which, NULL, 0);
n_asked_for = smartlist_len(which);
}
if (status_code != 200) {
int dir_okay = status_code == 404 ||
(status_code == 400 && !strcmp(reason, "Servers unavailable."));
/* 404 means that it didn't have them; no big deal.
* Older (pre-0.1.1.8) servers said 400 Servers unavailable instead. */
log_fn(dir_okay ? LOG_INFO : LOG_WARN, LD_DIR,
"Received http status code %d (%s) from server '%s:%d' "
"while fetching \"/tor/server/%s\". I'll try again soon.",
status_code, escaped(reason), conn->base_.address,
conn->base_.port, conn->requested_resource);
if (!which) {
connection_dir_download_routerdesc_failed(conn);
} else {
dir_routerdesc_download_failed(which, status_code,
conn->router_purpose,
was_ei, descriptor_digests);
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
}
return dir_okay ? 0 : -1;
}
/* Learn the routers, assuming we requested by fingerprint or "all"
* or "authority".
*
* We use "authority" to fetch our own descriptor for
* testing, and to fetch bridge descriptors for bootstrapping. Ignore
* the output of "authority" requests unless we are using bridges,
* since otherwise they'll be the response from reachability tests,
* and we don't really want to add that to our routerlist. */
if (which || (conn->requested_resource &&
(!strcmpstart(conn->requested_resource, "all") ||
(!strcmpstart(conn->requested_resource, "authority") &&
get_options()->UseBridges)))) {
/* as we learn from them, we remove them from 'which' */
if (was_ei) {
router_load_extrainfo_from_string(body, NULL, SAVED_NOWHERE, which,
descriptor_digests);
} else {
//router_load_routers_from_string(body, NULL, SAVED_NOWHERE, which,
// descriptor_digests, conn->router_purpose);
if (load_downloaded_routers(body, which, descriptor_digests,
conn->router_purpose,
conn->base_.address)) {
time_t now = approx_time();
directory_info_has_arrived(now, 0, 1);
}
}
}
if (which) { /* mark remaining ones as failed */
log_info(LD_DIR, "Received %d/%d %s requested from %s:%d",
n_asked_for-smartlist_len(which), n_asked_for,
was_ei ? "extra-info documents" : "router descriptors",
conn->base_.address, (int)conn->base_.port);
if (smartlist_len(which)) {
dir_routerdesc_download_failed(which, status_code,
conn->router_purpose,
was_ei, descriptor_digests);
}
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
}
if (directory_conn_is_self_reachability_test(conn))
router_dirport_found_reachable();
return 0;
}
/**
* Handler function: processes a response to a request for a group of
* microdescriptors
**/
STATIC int
handle_response_fetch_microdesc(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_MICRODESC);
const int status_code = args->status_code;
const char *reason = args->reason;
const char *body = args->body;
const size_t body_len = args->body_len;
smartlist_t *which = NULL;
log_info(LD_DIR,"Received answer to microdescriptor request (status %d, "
"body size %d) from server '%s:%d'",
status_code, (int)body_len, conn->base_.address,
conn->base_.port);
tor_assert(conn->requested_resource &&
!strcmpstart(conn->requested_resource, "d/"));
tor_assert_nonfatal(!fast_mem_is_zero(conn->identity_digest, DIGEST_LEN));
which = smartlist_new();
dir_split_resource_into_fingerprints(conn->requested_resource+2,
which, NULL,
DSR_DIGEST256|DSR_BASE64);
if (status_code != 200) {
log_info(LD_DIR, "Received status code %d (%s) from server "
"'%s:%d' while fetching \"/tor/micro/%s\". I'll try again "
"soon.",
status_code, escaped(reason), conn->base_.address,
(int)conn->base_.port, conn->requested_resource);
dir_microdesc_download_failed(which, status_code, conn->identity_digest);
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
return 0;
} else {
smartlist_t *mds;
time_t now = approx_time();
mds = microdescs_add_to_cache(get_microdesc_cache(),
body, body+body_len, SAVED_NOWHERE, 0,
now, which);
if (smartlist_len(which)) {
/* Mark remaining ones as failed. */
dir_microdesc_download_failed(which, status_code, conn->identity_digest);
}
if (mds && smartlist_len(mds)) {
control_event_boot_dir(BOOTSTRAP_STATUS_LOADING_DESCRIPTORS,
count_loading_descriptors_progress());
directory_info_has_arrived(now, 0, 1);
}
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
smartlist_free(mds);
}
return 0;
}
/**
* Handler function: processes a response to a POST request to upload our
* router descriptor.
**/
static int
handle_response_upload_dir(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_UPLOAD_DIR);
const int status_code = args->status_code;
const char *reason = args->reason;
const char *headers = args->headers;
switch (status_code) {
case 200: {
dir_server_t *ds =
router_get_trusteddirserver_by_digest(conn->identity_digest);
char *rejected_hdr = http_get_header(headers,
"X-Descriptor-Not-New: ");
if (rejected_hdr) {
if (!strcmp(rejected_hdr, "Yes")) {
log_info(LD_GENERAL,
"Authority '%s' declined our descriptor (not new)",
ds->nickname);
/* XXXX use this information; be sure to upload next one
* sooner. -NM */
/* XXXX++ On further thought, the task above implies that we're
* basing our regenerate-descriptor time on when we uploaded the
* last descriptor, not on the published time of the last
* descriptor. If those are different, that's a bad thing to
* do. -NM */
}
tor_free(rejected_hdr);
}
log_info(LD_GENERAL,"eof (status 200) after uploading server "
"descriptor: finished.");
control_event_server_status(
LOG_NOTICE, "ACCEPTED_SERVER_DESCRIPTOR DIRAUTH=%s:%d",
conn->base_.address, conn->base_.port);
ds->has_accepted_serverdesc = 1;
if (directories_have_accepted_server_descriptor())
control_event_server_status(LOG_NOTICE, "GOOD_SERVER_DESCRIPTOR");
}
break;
case 400:
log_warn(LD_GENERAL,"http status 400 (%s) response from "
"dirserver '%s:%d'. Please correct.",
escaped(reason), conn->base_.address, conn->base_.port);
control_event_server_status(LOG_WARN,
"BAD_SERVER_DESCRIPTOR DIRAUTH=%s:%d REASON=\"%s\"",
conn->base_.address, conn->base_.port, escaped(reason));
break;
default:
log_warn(LD_GENERAL,
"HTTP status %d (%s) was unexpected while uploading "
"descriptor to server '%s:%d'. Possibly the server is "
"misconfigured?",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
break;
}
/* return 0 in all cases, since we don't want to mark any
* dirservers down just because they don't like us. */
return 0;
}
/**
* Handler function: processes a response to POST request to upload our
* own networkstatus vote.
**/
static int
handle_response_upload_vote(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_UPLOAD_VOTE);
const int status_code = args->status_code;
const char *reason = args->reason;
switch (status_code) {
case 200: {
log_notice(LD_DIR,"Uploaded a vote to dirserver %s:%d",
conn->base_.address, conn->base_.port);
}
break;
case 400:
log_warn(LD_DIR,"http status 400 (%s) response after uploading "
"vote to dirserver '%s:%d'. Please correct.",
escaped(reason), conn->base_.address, conn->base_.port);
break;
default:
log_warn(LD_GENERAL,
"HTTP status %d (%s) was unexpected while uploading "
"vote to server '%s:%d'.",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
break;
}
/* return 0 in all cases, since we don't want to mark any
* dirservers down just because they don't like us. */
return 0;
}
/**
* Handler function: processes a response to POST request to upload our
* view of the signatures on the current consensus.
**/
static int
handle_response_upload_signatures(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_UPLOAD_SIGNATURES);
const int status_code = args->status_code;
const char *reason = args->reason;
switch (status_code) {
case 200: {
log_notice(LD_DIR,"Uploaded signature(s) to dirserver %s:%d",
conn->base_.address, conn->base_.port);
}
break;
case 400:
log_warn(LD_DIR,"http status 400 (%s) response after uploading "
"signatures to dirserver '%s:%d'. Please correct.",
escaped(reason), conn->base_.address, conn->base_.port);
break;
default:
log_warn(LD_GENERAL,
"HTTP status %d (%s) was unexpected while uploading "
"signatures to server '%s:%d'.",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
break;
}
/* return 0 in all cases, since we don't want to mark any
* dirservers down just because they don't like us. */
return 0;
}
/**
* Handler function: processes a response to a request for a v3 hidden service
* descriptor.
**/
STATIC int
handle_response_fetch_hsdesc_v3(dir_connection_t *conn,
const response_handler_args_t *args)
{
const int status_code = args->status_code;
const char *reason = args->reason;
const char *body = args->body;
const size_t body_len = args->body_len;
tor_assert(conn->hs_ident);
log_info(LD_REND,"Received v3 hsdesc (body size %d, status %d (%s))",
(int)body_len, status_code, escaped(reason));
hs_client_dir_fetch_done(conn, reason, body, status_code);
return 0;
}
/**
* Handler function: processes a response to a request for a v2 hidden service
* descriptor.
**/
static int
handle_response_fetch_renddesc_v2(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_FETCH_RENDDESC_V2);
const int status_code = args->status_code;
const char *reason = args->reason;
const char *body = args->body;
const size_t body_len = args->body_len;
#define SEND_HS_DESC_FAILED_EVENT(reason) \
(control_event_hsv2_descriptor_failed(conn->rend_data, \
conn->identity_digest, \
reason))
#define SEND_HS_DESC_FAILED_CONTENT() \
(control_event_hs_descriptor_content( \
rend_data_get_address(conn->rend_data), \
conn->requested_resource, \
conn->identity_digest, \
NULL))
tor_assert(conn->rend_data);
log_info(LD_REND,"Received rendezvous descriptor (body size %d, status %d "
"(%s))",
(int)body_len, status_code, escaped(reason));
switch (status_code) {
case 200:
{
rend_cache_entry_t *entry = NULL;
if (rend_cache_store_v2_desc_as_client(body,
conn->requested_resource,
conn->rend_data, &entry) < 0) {
log_warn(LD_REND,"Fetching v2 rendezvous descriptor failed. "
"Retrying at another directory.");
/* We'll retry when connection_about_to_close_connection()
* cleans this dir conn up. */
SEND_HS_DESC_FAILED_EVENT("BAD_DESC");
SEND_HS_DESC_FAILED_CONTENT();
} else {
char service_id[REND_SERVICE_ID_LEN_BASE32 + 1];
/* Should never be NULL here if we found the descriptor. */
tor_assert(entry);
rend_get_service_id(entry->parsed->pk, service_id);
/* success. notify pending connections about this. */
log_info(LD_REND, "Successfully fetched v2 rendezvous "
"descriptor.");
control_event_hsv2_descriptor_received(service_id,
conn->rend_data,
conn->identity_digest);
control_event_hs_descriptor_content(service_id,
conn->requested_resource,
conn->identity_digest,
body);
conn->base_.purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC_V2;
rend_client_desc_trynow(service_id);
memwipe(service_id, 0, sizeof(service_id));
}
break;
}
case 404:
/* Not there. We'll retry when
* connection_about_to_close_connection() cleans this conn up. */
log_info(LD_REND,"Fetching v2 rendezvous descriptor failed: "
"Retrying at another directory.");
SEND_HS_DESC_FAILED_EVENT("NOT_FOUND");
SEND_HS_DESC_FAILED_CONTENT();
break;
case 400:
log_warn(LD_REND, "Fetching v2 rendezvous descriptor failed: "
"http status 400 (%s). Dirserver didn't like our "
"v2 rendezvous query? Retrying at another directory.",
escaped(reason));
SEND_HS_DESC_FAILED_EVENT("QUERY_REJECTED");
SEND_HS_DESC_FAILED_CONTENT();
break;
default:
log_warn(LD_REND, "Fetching v2 rendezvous descriptor failed: "
"http status %d (%s) response unexpected while "
"fetching v2 hidden service descriptor (server '%s:%d'). "
"Retrying at another directory.",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
SEND_HS_DESC_FAILED_EVENT("UNEXPECTED");
SEND_HS_DESC_FAILED_CONTENT();
break;
}
return 0;
}
/**
* Handler function: processes a response to a POST request to upload a v2
* hidden service descriptor.
**/
static int
handle_response_upload_renddesc_v2(dir_connection_t *conn,
const response_handler_args_t *args)
{
tor_assert(conn->base_.purpose == DIR_PURPOSE_UPLOAD_RENDDESC_V2);
const int status_code = args->status_code;
const char *reason = args->reason;
#define SEND_HS_DESC_UPLOAD_FAILED_EVENT(reason) \
(control_event_hs_descriptor_upload_failed( \
conn->identity_digest, \
rend_data_get_address(conn->rend_data), \
reason))
log_info(LD_REND,"Uploaded rendezvous descriptor (status %d "
"(%s))",
status_code, escaped(reason));
/* Without the rend data, we'll have a problem identifying what has been
* uploaded for which service. */
tor_assert(conn->rend_data);
switch (status_code) {
case 200:
log_info(LD_REND,
"Uploading rendezvous descriptor: finished with status "
"200 (%s)", escaped(reason));
control_event_hs_descriptor_uploaded(conn->identity_digest,
rend_data_get_address(conn->rend_data));
rend_service_desc_has_uploaded(conn->rend_data);
break;
case 400:
log_warn(LD_REND,"http status 400 (%s) response from dirserver "
"'%s:%d'. Malformed rendezvous descriptor?",
escaped(reason), conn->base_.address, conn->base_.port);
SEND_HS_DESC_UPLOAD_FAILED_EVENT("UPLOAD_REJECTED");
break;
default:
log_warn(LD_REND,"http status %d (%s) response unexpected (server "
"'%s:%d').",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
SEND_HS_DESC_UPLOAD_FAILED_EVENT("UNEXPECTED");
break;
}
return 0;
}
/**
* Handler function: processes a response to a POST request to upload an
* hidden service descriptor.
**/
static int
handle_response_upload_hsdesc(dir_connection_t *conn,
const response_handler_args_t *args)
{
const int status_code = args->status_code;
const char *reason = args->reason;
tor_assert(conn);
tor_assert(conn->base_.purpose == DIR_PURPOSE_UPLOAD_HSDESC);
log_info(LD_REND, "Uploaded hidden service descriptor (status %d "
"(%s))",
status_code, escaped(reason));
/* For this directory response, it MUST have an hidden service identifier on
* this connection. */
tor_assert(conn->hs_ident);
switch (status_code) {
case 200:
log_info(LD_REND, "Uploading hidden service descriptor: "
"finished with status 200 (%s)", escaped(reason));
hs_control_desc_event_uploaded(conn->hs_ident, conn->identity_digest);
break;
case 400:
log_fn(LOG_PROTOCOL_WARN, LD_REND,
"Uploading hidden service descriptor: http "
"status 400 (%s) response from dirserver "
"'%s:%d'. Malformed hidden service descriptor?",
escaped(reason), conn->base_.address, conn->base_.port);
hs_control_desc_event_failed(conn->hs_ident, conn->identity_digest,
"UPLOAD_REJECTED");
break;
default:
log_warn(LD_REND, "Uploading hidden service descriptor: http "
"status %d (%s) response unexpected (server "
"'%s:%d').",
status_code, escaped(reason), conn->base_.address,
conn->base_.port);
hs_control_desc_event_failed(conn->hs_ident, conn->identity_digest,
"UNEXPECTED");
break;
}
return 0;
}
/** Called when a directory connection reaches EOF. */
int
connection_dir_reached_eof(dir_connection_t *conn)
{
int retval;
if (conn->base_.state != DIR_CONN_STATE_CLIENT_READING) {
log_info(LD_HTTP,"conn reached eof, not reading. [state=%d] Closing.",
conn->base_.state);
connection_close_immediate(TO_CONN(conn)); /* error: give up on flushing */
connection_mark_for_close(TO_CONN(conn));
return -1;
}
retval = connection_dir_client_reached_eof(conn);
if (retval == 0) /* success */
conn->base_.state = DIR_CONN_STATE_CLIENT_FINISHED;
connection_mark_for_close(TO_CONN(conn));
return retval;
}
/** We are closing a dir connection: If <b>dir_conn</b> is a dir connection
* that tried to fetch an HS descriptor, check if it successfully fetched it,
* or if we need to try again. */
void
connection_dir_client_refetch_hsdesc_if_needed(dir_connection_t *dir_conn)
{
connection_t *conn = TO_CONN(dir_conn);
/* If we were trying to fetch a v2 rend desc and did not succeed, retry as
* needed. (If a fetch is successful, the connection state is changed to
* DIR_PURPOSE_HAS_FETCHED_RENDDESC_V2 or DIR_PURPOSE_HAS_FETCHED_HSDESC to
* mark that refetching is unnecessary.) */
if (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC_V2 &&
dir_conn->rend_data &&
rend_valid_v2_service_id(
rend_data_get_address(dir_conn->rend_data))) {
rend_client_refetch_v2_renddesc(dir_conn->rend_data);
}
/* Check for v3 rend desc fetch */
if (conn->purpose == DIR_PURPOSE_FETCH_HSDESC &&
dir_conn->hs_ident &&
!ed25519_public_key_is_zero(&dir_conn->hs_ident->identity_pk)) {
hs_client_refetch_hsdesc(&dir_conn->hs_ident->identity_pk);
}
}
/** Array of compression methods to use (if supported) for requesting
* compressed data, ordered from best to worst. */
static compress_method_t client_meth_pref[] = {
LZMA_METHOD,
ZSTD_METHOD,
ZLIB_METHOD,
GZIP_METHOD,
NO_METHOD
};
/** Array of allowed compression methods to use (if supported) when receiving a
* response from a request that was required to be anonymous. */
static compress_method_t client_meth_allowed_anonymous_compression[] = {
ZLIB_METHOD,
GZIP_METHOD,
NO_METHOD
};
/** Return a newly allocated string containing a comma separated list of
* supported encodings. */
STATIC char *
accept_encoding_header(void)
{
smartlist_t *methods = smartlist_new();
char *header = NULL;
compress_method_t method;
unsigned i;
for (i = 0; i < ARRAY_LENGTH(client_meth_pref); ++i) {
method = client_meth_pref[i];
if (tor_compress_supports_method(method))
smartlist_add(methods, (char *)compression_method_get_name(method));
}
header = smartlist_join_strings(methods, ", ", 0, NULL);
smartlist_free(methods);
return header;
}
/** Check if the given compression method is allowed for a connection that is
* supposed to be anonymous. Returns 1 if the compression method is allowed,
* otherwise 0. */
STATIC int
allowed_anonymous_connection_compression_method(compress_method_t method)
{
unsigned u;
for (u = 0; u < ARRAY_LENGTH(client_meth_allowed_anonymous_compression);
++u) {
compress_method_t allowed_method =
client_meth_allowed_anonymous_compression[u];
if (! tor_compress_supports_method(allowed_method))
continue;
if (method == allowed_method)
return 1;
}
return 0;
}
/** Log a warning when a remote server has sent us a document using a
* compression method that is not allowed for anonymous directory requests. */
STATIC void
warn_disallowed_anonymous_compression_method(compress_method_t method)
{
log_fn(LOG_PROTOCOL_WARN, LD_HTTP,
"Received a %s HTTP response, which is not "
"allowed for anonymous directory requests.",
compression_method_get_human_name(method));
}
/* We just got a new consensus! If there are other in-progress requests
* for this consensus flavor (for example because we launched several in
* parallel), cancel them.
*
* We do this check here (not just in
* connection_ap_handshake_attach_circuit()) to handle the edge case where
* a consensus fetch begins and ends before some other one tries to attach to
* a circuit, in which case the other one won't know that we're all happy now.
*
* Don't mark the conn that just gave us the consensus -- otherwise we
* would end up double-marking it when it cleans itself up.
*/
static void
connection_dir_close_consensus_fetches(dir_connection_t *except_this_one,
const char *resource)
{
smartlist_t *conns_to_close =
connection_dir_list_by_purpose_and_resource(DIR_PURPOSE_FETCH_CONSENSUS,
resource);
SMARTLIST_FOREACH_BEGIN(conns_to_close, dir_connection_t *, d) {
if (d == except_this_one)
continue;
log_info(LD_DIR, "Closing consensus fetch (to %s) since one "
"has just arrived.", TO_CONN(d)->address);
connection_mark_for_close(TO_CONN(d));
} SMARTLIST_FOREACH_END(d);
smartlist_free(conns_to_close);
}
/** Called when one or more routerdesc (or extrainfo, if <b>was_extrainfo</b>)
* fetches have failed (with uppercase fingerprints listed in <b>failed</b>,
* either as descriptor digests or as identity digests based on
* <b>was_descriptor_digests</b>).
*/
static void
dir_routerdesc_download_failed(smartlist_t *failed, int status_code,
int router_purpose,
int was_extrainfo, int was_descriptor_digests)
{
char digest[DIGEST_LEN];
time_t now = time(NULL);
int server = dirclient_fetches_from_authorities(get_options());
if (!was_descriptor_digests) {
if (router_purpose == ROUTER_PURPOSE_BRIDGE) {
tor_assert(!was_extrainfo);
connection_dir_retry_bridges(failed);
}
return; /* FFFF should implement for other-than-router-purpose someday */
}
SMARTLIST_FOREACH_BEGIN(failed, const char *, cp) {
download_status_t *dls = NULL;
if (base16_decode(digest, DIGEST_LEN, cp, strlen(cp)) != DIGEST_LEN) {
log_warn(LD_BUG, "Malformed fingerprint in list: %s", escaped(cp));
continue;
}
if (was_extrainfo) {
signed_descriptor_t *sd =
router_get_by_extrainfo_digest(digest);
if (sd)
dls = &sd->ei_dl_status;
} else {
dls = router_get_dl_status_by_descriptor_digest(digest);
}
if (!dls)
continue;
download_status_increment_failure(dls, status_code, cp, server, now);
} SMARTLIST_FOREACH_END(cp);
/* No need to relaunch descriptor downloads here: we already do it
* every 10 or 60 seconds (FOO_DESCRIPTOR_RETRY_INTERVAL) in main.c. */
}
/** Called when a connection to download microdescriptors from relay with
* <b>dir_id</b> has failed in whole or in part. <b>failed</b> is a list
* of every microdesc digest we didn't get. <b>status_code</b> is the http
* status code we received. Reschedule the microdesc downloads as
* appropriate. */
static void
dir_microdesc_download_failed(smartlist_t *failed,
int status_code, const char *dir_id)
{
networkstatus_t *consensus
= networkstatus_get_latest_consensus_by_flavor(FLAV_MICRODESC);
routerstatus_t *rs;
download_status_t *dls;
time_t now = time(NULL);
int server = dirclient_fetches_from_authorities(get_options());
if (! consensus)
return;
/* We failed to fetch a microdescriptor from 'dir_id', note it down
* so that we don't try the same relay next time... */
microdesc_note_outdated_dirserver(dir_id);
SMARTLIST_FOREACH_BEGIN(failed, const char *, d) {
rs = router_get_mutable_consensus_status_by_descriptor_digest(consensus,d);
if (!rs)
continue;
dls = &rs->dl_status;
{ /* Increment the failure count for this md fetch */
char buf[BASE64_DIGEST256_LEN+1];
digest256_to_base64(buf, d);
log_info(LD_DIR, "Failed to download md %s from %s",
buf, hex_str(dir_id, DIGEST_LEN));
download_status_increment_failure(dls, status_code, buf,
server, now);
}
} SMARTLIST_FOREACH_END(d);
}