Tor  0.4.6.0-alpha-dev
hs_client.c
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1 /* Copyright (c) 2016-2020, The Tor Project, Inc. */
2 /* See LICENSE for licensing information */
3 
4 /**
5  * \file hs_client.c
6  * \brief Implement next generation hidden service client functionality
7  **/
8 
9 #define HS_CLIENT_PRIVATE
10 
11 #include "core/or/or.h"
12 #include "app/config/config.h"
13 #include "core/crypto/hs_ntor.h"
15 #include "core/or/circuitbuild.h"
16 #include "core/or/circuitlist.h"
17 #include "core/or/circuituse.h"
19 #include "core/or/extendinfo.h"
20 #include "core/or/reasons.h"
21 #include "feature/client/circpathbias.h"
24 #include "feature/hs/hs_cache.h"
25 #include "feature/hs/hs_cell.h"
26 #include "feature/hs/hs_circuit.h"
28 #include "feature/hs/hs_client.h"
29 #include "feature/hs/hs_control.h"
31 #include "feature/hs/hs_ident.h"
40 
44 #include "core/or/extend_info_st.h"
47 
48 /** Client-side authorizations for hidden services; map of service identity
49  * public key to hs_client_service_authorization_t *. */
50 static digest256map_t *client_auths = NULL;
51 
52 #include "trunnel/hs/cell_introduce1.h"
53 
54 /** Return a human-readable string for the client fetch status code. */
55 static const char *
57 {
58  switch (status) {
60  return "Internal error";
62  return "Descriptor fetch launched";
64  return "Already have descriptor";
66  return "No more HSDir available to query";
68  return "Fetching descriptors is not allowed";
70  return "Missing directory information";
72  return "Pending descriptor fetch";
73  default:
74  return "(Unknown client fetch status code)";
75  }
76 }
77 
78 /** Return true iff tor should close the SOCKS request(s) for the descriptor
79  * fetch that ended up with this given status code. */
80 static int
82 {
83  switch (status) {
85  /* No more HSDir to query, we can't complete the SOCKS request(s). */
87  /* The fetch triggered an internal error. */
89  /* Client is not allowed to fetch (FetchHidServDescriptors 0). */
90  goto close;
95  /* The rest doesn't require tor to close the SOCKS request(s). */
96  goto no_close;
97  }
98 
99  no_close:
100  return 0;
101  close:
102  return 1;
103 }
104 
105 /* Return a newly allocated list of all the entry connections that matches the
106  * given service identity pk. If service_identity_pk is NULL, all entry
107  * connections with an hs_ident are returned.
108  *
109  * Caller must free the returned list but does NOT have ownership of the
110  * object inside thus they have to remain untouched. */
111 static smartlist_t *
112 find_entry_conns(const ed25519_public_key_t *service_identity_pk)
113 {
114  time_t now = time(NULL);
115  smartlist_t *conns = NULL, *entry_conns = NULL;
116 
117  entry_conns = smartlist_new();
118 
119  conns = connection_list_by_type_state(CONN_TYPE_AP,
121  SMARTLIST_FOREACH_BEGIN(conns, connection_t *, base_conn) {
122  entry_connection_t *entry_conn = TO_ENTRY_CONN(base_conn);
123  const edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(entry_conn);
124 
125  /* Only consider the entry connections that matches the service for which
126  * we just fetched its descriptor. */
127  if (!edge_conn->hs_ident ||
128  (service_identity_pk &&
129  !ed25519_pubkey_eq(service_identity_pk,
130  &edge_conn->hs_ident->identity_pk))) {
131  continue;
132  }
133  assert_connection_ok(base_conn, now);
134 
135  /* Validated! Add the entry connection to the list. */
136  smartlist_add(entry_conns, entry_conn);
137  } SMARTLIST_FOREACH_END(base_conn);
138 
139  /* We don't have ownership of the objects in this list. */
140  smartlist_free(conns);
141  return entry_conns;
142 }
143 
144 /* Cancel all descriptor fetches currently in progress. */
145 static void
146 cancel_descriptor_fetches(void)
147 {
148  smartlist_t *conns =
149  connection_list_by_type_purpose(CONN_TYPE_DIR, DIR_PURPOSE_FETCH_HSDESC);
150  SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
151  const hs_ident_dir_conn_t *ident = TO_DIR_CONN(conn)->hs_ident;
152  if (BUG(ident == NULL)) {
153  /* A directory connection fetching a service descriptor can't have an
154  * empty hidden service identifier. */
155  continue;
156  }
157  log_debug(LD_REND, "Marking for close a directory connection fetching "
158  "a hidden service descriptor for service %s.",
159  safe_str_client(ed25519_fmt(&ident->identity_pk)));
160  connection_mark_for_close(conn);
161  } SMARTLIST_FOREACH_END(conn);
162 
163  /* No ownership of the objects in this list. */
164  smartlist_free(conns);
165  log_info(LD_REND, "Hidden service client descriptor fetches cancelled.");
166 }
167 
168 /** Get all connections that are waiting on a circuit and flag them back to
169  * waiting for a hidden service descriptor for the given service key
170  * service_identity_pk. */
171 static void
173 {
174  tor_assert(service_identity_pk);
175 
176  smartlist_t *conns =
177  connection_list_by_type_state(CONN_TYPE_AP, AP_CONN_STATE_CIRCUIT_WAIT);
178 
179  SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
180  edge_connection_t *edge_conn;
181  if (BUG(!CONN_IS_EDGE(conn))) {
182  continue;
183  }
184  edge_conn = TO_EDGE_CONN(conn);
185  if (edge_conn->hs_ident &&
186  ed25519_pubkey_eq(&edge_conn->hs_ident->identity_pk,
187  service_identity_pk)) {
189  }
190  } SMARTLIST_FOREACH_END(conn);
191 
192  smartlist_free(conns);
193 }
194 
195 /** Remove tracked HSDir requests from our history for this hidden service
196  * identity public key. */
197 static void
199 {
200  char base64_blinded_pk[ED25519_BASE64_LEN + 1];
201  ed25519_public_key_t blinded_pk;
202 
203  tor_assert(identity_pk);
204 
205  /* Get blinded pubkey of hidden service. It is possible that we just moved
206  * to a new time period meaning that we won't be able to purge the request
207  * from the previous time period. That is fine because they will expire at
208  * some point and we don't care about those anymore. */
209  hs_build_blinded_pubkey(identity_pk, NULL, 0,
210  hs_get_time_period_num(0), &blinded_pk);
211  ed25519_public_to_base64(base64_blinded_pk, &blinded_pk);
212  /* Purge last hidden service request from cache for this blinded key. */
214 }
215 
216 /** Return true iff there is at least one pending directory descriptor request
217  * for the service identity_pk. */
218 static int
220 {
221  int ret = 0;
222  smartlist_t *conns =
223  connection_list_by_type_purpose(CONN_TYPE_DIR, DIR_PURPOSE_FETCH_HSDESC);
224 
225  SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
226  const hs_ident_dir_conn_t *ident = TO_DIR_CONN(conn)->hs_ident;
227  if (BUG(ident == NULL)) {
228  /* A directory connection fetching a service descriptor can't have an
229  * empty hidden service identifier. */
230  continue;
231  }
232  if (!ed25519_pubkey_eq(identity_pk, &ident->identity_pk)) {
233  continue;
234  }
235  ret = 1;
236  break;
237  } SMARTLIST_FOREACH_END(conn);
238 
239  /* No ownership of the objects in this list. */
240  smartlist_free(conns);
241  return ret;
242 }
243 
244 /** Helper function that changes the state of an entry connection to waiting
245  * for a circuit. For this to work properly, the connection timestamps are set
246  * to now and the connection is then marked as pending for a circuit. */
247 static void
249 {
250  tor_assert(conn);
251 
252  /* Because the connection can now proceed to opening circuit and ultimately
253  * connect to the service, reset those timestamp so the connection is
254  * considered "fresh" and can continue without being closed too early. */
255  conn->timestamp_created = now;
256  conn->timestamp_last_read_allowed = now;
257  conn->timestamp_last_write_allowed = now;
258  /* Change connection's state into waiting for a circuit. */
260 
261  connection_ap_mark_as_pending_circuit(TO_ENTRY_CONN(conn));
262 }
263 
264 /** We failed to fetch a descriptor for the service with <b>identity_pk</b>
265  * because of <b>status</b>. Find all pending SOCKS connections for this
266  * service that are waiting on the descriptor and close them with
267  * <b>reason</b>. */
268 static void
271  int reason)
272 {
273  unsigned int count = 0;
274  smartlist_t *entry_conns = find_entry_conns(identity_pk);
275 
276  SMARTLIST_FOREACH_BEGIN(entry_conns, entry_connection_t *, entry_conn) {
277  /* Unattach the entry connection which will close for the reason. */
278  connection_mark_unattached_ap(entry_conn, reason);
279  count++;
280  } SMARTLIST_FOREACH_END(entry_conn);
281 
282  if (count > 0) {
283  char onion_address[HS_SERVICE_ADDR_LEN_BASE32 + 1];
284  hs_build_address(identity_pk, HS_VERSION_THREE, onion_address);
285  log_notice(LD_REND, "Closed %u streams for service %s.onion "
286  "for reason %s. Fetch status: %s.",
287  count, safe_str_client(onion_address),
289  fetch_status_to_string(status));
290  }
291 
292  /* No ownership of the object(s) in this list. */
293  smartlist_free(entry_conns);
294 }
295 
296 /** Find all pending SOCKS connection waiting for a descriptor and retry them
297  * all. This is called when the directory information changed. */
298 STATIC void
300 {
301  smartlist_t *entry_conns = find_entry_conns(NULL);
302 
303  SMARTLIST_FOREACH_BEGIN(entry_conns, entry_connection_t *, entry_conn) {
305  edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(entry_conn);
306  connection_t *base_conn = &edge_conn->base_;
307 
308  /* Ignore non HS or non v3 connection. */
309  if (edge_conn->hs_ident == NULL) {
310  continue;
311  }
312 
313  /* In this loop, we will possibly try to fetch a descriptor for the
314  * pending connections because we just got more directory information.
315  * However, the refetch process can cleanup all SOCKS request to the same
316  * service if an internal error happens. Thus, we can end up with closed
317  * connections in our list. */
318  if (base_conn->marked_for_close) {
319  continue;
320  }
321 
322  /* XXX: There is an optimization we could do which is that for a service
323  * key, we could check if we can fetch and remember that decision. */
324 
325  /* Order a refetch in case it works this time. */
326  status = hs_client_refetch_hsdesc(&edge_conn->hs_ident->identity_pk);
327  if (status == HS_CLIENT_FETCH_HAVE_DESC) {
328  /* This is a rare case where a SOCKS connection is in state waiting for
329  * a descriptor but we do have it in the cache.
330  *
331  * This can happen is tor comes back from suspend where it previously
332  * had the descriptor but the intro points were not usable. Once it
333  * came back to life, the intro point failure cache was cleaned up and
334  * thus the descriptor became usable again leaving us in this code path.
335  *
336  * We'll mark the connection as waiting for a circuit so the descriptor
337  * can be retried. This is safe because a connection in state waiting
338  * for a descriptor can not be in the entry connection pending list. */
340  continue;
341  }
342  /* In the case of an error, either all SOCKS connections have been
343  * closed or we are still missing directory information. Leave the
344  * connection in renddesc wait state so when we get more info, we'll be
345  * able to try it again. */
346  } SMARTLIST_FOREACH_END(entry_conn);
347 
348  /* We don't have ownership of those objects. */
349  smartlist_free(entry_conns);
350 }
351 
352 /** A v3 HS circuit successfully connected to the hidden service. Update the
353  * stream state at <b>hs_conn_ident</b> appropriately. */
354 static void
356 {
357  tor_assert(hs_conn_ident);
358 
359  /* Remove from the hid serv cache all requests for that service so we can
360  * query the HSDir again later on for various reasons. */
361  purge_hid_serv_request(&hs_conn_ident->identity_pk);
362 }
363 
364 /** Given the pubkey of a hidden service in <b>onion_identity_pk</b>, fetch its
365  * descriptor by launching a dir connection to <b>hsdir</b>. Return a
366  * hs_client_fetch_status_t status code depending on how it went. */
369  const routerstatus_t *hsdir)
370 {
371  uint64_t current_time_period = hs_get_time_period_num(0);
372  ed25519_public_key_t blinded_pubkey;
373  char base64_blinded_pubkey[ED25519_BASE64_LEN + 1];
374  hs_ident_dir_conn_t hs_conn_dir_ident;
375 
376  tor_assert(hsdir);
377  tor_assert(onion_identity_pk);
378 
379  /* Get blinded pubkey */
380  hs_build_blinded_pubkey(onion_identity_pk, NULL, 0,
381  current_time_period, &blinded_pubkey);
382  /* ...and base64 it. */
383  ed25519_public_to_base64(base64_blinded_pubkey, &blinded_pubkey);
384 
385  /* Copy onion pk to a dir_ident so that we attach it to the dir conn */
386  hs_ident_dir_conn_init(onion_identity_pk, &blinded_pubkey,
387  &hs_conn_dir_ident);
388 
389  /* Setup directory request */
390  directory_request_t *req =
394  directory_request_set_resource(req, base64_blinded_pubkey);
395  directory_request_fetch_set_hs_ident(req, &hs_conn_dir_ident);
397  directory_request_free(req);
398 
399  log_info(LD_REND, "Descriptor fetch request for service %s with blinded "
400  "key %s to directory %s",
401  safe_str_client(ed25519_fmt(onion_identity_pk)),
402  safe_str_client(base64_blinded_pubkey),
403  safe_str_client(routerstatus_describe(hsdir)));
404 
405  /* Fire a REQUESTED event on the control port. */
406  hs_control_desc_event_requested(onion_identity_pk, base64_blinded_pubkey,
407  hsdir);
408 
409  /* Cleanup memory. */
410  memwipe(&blinded_pubkey, 0, sizeof(blinded_pubkey));
411  memwipe(base64_blinded_pubkey, 0, sizeof(base64_blinded_pubkey));
412  memwipe(&hs_conn_dir_ident, 0, sizeof(hs_conn_dir_ident));
413 
415 }
416 
417 /** Return the HSDir we should use to fetch the descriptor of the hidden
418  * service with identity key <b>onion_identity_pk</b>. */
420 pick_hsdir_v3(const ed25519_public_key_t *onion_identity_pk)
421 {
422  char base64_blinded_pubkey[ED25519_BASE64_LEN + 1];
423  uint64_t current_time_period = hs_get_time_period_num(0);
424  smartlist_t *responsible_hsdirs = NULL;
425  ed25519_public_key_t blinded_pubkey;
426  routerstatus_t *hsdir_rs = NULL;
427 
428  tor_assert(onion_identity_pk);
429 
430  /* Get blinded pubkey of hidden service */
431  hs_build_blinded_pubkey(onion_identity_pk, NULL, 0,
432  current_time_period, &blinded_pubkey);
433  /* ...and base64 it. */
434  ed25519_public_to_base64(base64_blinded_pubkey, &blinded_pubkey);
435 
436  /* Get responsible hsdirs of service for this time period */
437  responsible_hsdirs = smartlist_new();
438 
439  hs_get_responsible_hsdirs(&blinded_pubkey, current_time_period,
440  0, 1, responsible_hsdirs);
441 
442  log_debug(LD_REND, "Found %d responsible HSDirs and about to pick one.",
443  smartlist_len(responsible_hsdirs));
444 
445  /* Pick an HSDir from the responsible ones. The ownership of
446  * responsible_hsdirs is given to this function so no need to free it. */
447  hsdir_rs = hs_pick_hsdir(responsible_hsdirs, base64_blinded_pubkey, NULL);
448 
449  return hsdir_rs;
450 }
451 
452 /** Fetch a v3 descriptor using the given <b>onion_identity_pk</b>.
453  *
454  * On success, HS_CLIENT_FETCH_LAUNCHED is returned. Otherwise, an error from
455  * hs_client_fetch_status_t is returned. */
457 fetch_v3_desc, (const ed25519_public_key_t *onion_identity_pk))
458 {
459  routerstatus_t *hsdir_rs =NULL;
460 
461  tor_assert(onion_identity_pk);
462 
463  hsdir_rs = pick_hsdir_v3(onion_identity_pk);
464  if (!hsdir_rs) {
465  log_info(LD_REND, "Couldn't pick a v3 hsdir.");
467  }
468 
469  return directory_launch_v3_desc_fetch(onion_identity_pk, hsdir_rs);
470 }
471 
472 /** With a given <b>onion_identity_pk</b>, fetch its descriptor. If
473  * <b>hsdirs</b> is specified, use the directory servers specified in the list.
474  * Else, use a random server. */
475 void
477  const smartlist_t *hsdirs)
478 {
479  tor_assert(onion_identity_pk);
480 
481  if (hsdirs != NULL) {
482  SMARTLIST_FOREACH_BEGIN(hsdirs, const routerstatus_t *, hsdir) {
483  directory_launch_v3_desc_fetch(onion_identity_pk, hsdir);
484  } SMARTLIST_FOREACH_END(hsdir);
485  } else {
486  fetch_v3_desc(onion_identity_pk);
487  }
488 }
489 
490 /** Make sure that the given v3 origin circuit circ is a valid correct
491  * introduction circuit. This will BUG() on any problems and hard assert if
492  * the anonymity of the circuit is not ok. Return 0 on success else -1 where
493  * the circuit should be mark for closed immediately. */
494 static int
496 {
497  int ret = 0;
498 
499  tor_assert(circ);
500 
501  if (BUG(TO_CIRCUIT(circ)->purpose != CIRCUIT_PURPOSE_C_INTRODUCING &&
503  TO_CIRCUIT(circ)->purpose != CIRCUIT_PURPOSE_C_INTRODUCE_ACKED)) {
504  ret = -1;
505  }
506  if (BUG(circ->hs_ident == NULL)) {
507  ret = -1;
508  }
509  if (BUG(!hs_ident_intro_circ_is_valid(circ->hs_ident))) {
510  ret = -1;
511  }
512 
513  /* This can stop the tor daemon but we want that since if we don't have
514  * anonymity on this circuit, something went really wrong. */
515  assert_circ_anonymity_ok(circ, get_options());
516  return ret;
517 }
518 
519 /** Find a descriptor intro point object that matches the given ident in the
520  * given descriptor desc. Return NULL if not found. */
521 static const hs_desc_intro_point_t *
523  const hs_descriptor_t *desc)
524 {
525  const hs_desc_intro_point_t *intro_point = NULL;
526 
527  tor_assert(ident);
528  tor_assert(desc);
529 
531  const hs_desc_intro_point_t *, ip) {
532  if (ed25519_pubkey_eq(&ident->intro_auth_pk,
533  &ip->auth_key_cert->signed_key)) {
534  intro_point = ip;
535  break;
536  }
537  } SMARTLIST_FOREACH_END(ip);
538 
539  return intro_point;
540 }
541 
542 /** Find a descriptor intro point object from the descriptor object desc that
543  * matches the given legacy identity digest in legacy_id. Return NULL if not
544  * found. */
545 static hs_desc_intro_point_t *
547  const hs_descriptor_t *desc)
548 {
549  hs_desc_intro_point_t *ret_ip = NULL;
550 
551  tor_assert(legacy_id);
552  tor_assert(desc);
553 
554  /* We will go over every intro point and try to find which one is linked to
555  * that circuit. Those lists are small so it's not that expensive. */
557  hs_desc_intro_point_t *, ip) {
558  SMARTLIST_FOREACH_BEGIN(ip->link_specifiers,
559  const link_specifier_t *, lspec) {
560  /* Not all tor node have an ed25519 identity key so we still rely on the
561  * legacy identity digest. */
562  if (link_specifier_get_ls_type(lspec) != LS_LEGACY_ID) {
563  continue;
564  }
565  if (fast_memneq(legacy_id,
566  link_specifier_getconstarray_un_legacy_id(lspec),
567  DIGEST_LEN)) {
568  break;
569  }
570  /* Found it. */
571  ret_ip = ip;
572  goto end;
573  } SMARTLIST_FOREACH_END(lspec);
574  } SMARTLIST_FOREACH_END(ip);
575 
576  end:
577  return ret_ip;
578 }
579 
580 /** Send an INTRODUCE1 cell along the intro circuit and populate the rend
581  * circuit identifier with the needed key material for the e2e encryption.
582  * Return 0 on success, -1 if there is a transient error such that an action
583  * has been taken to recover and -2 if there is a permanent error indicating
584  * that both circuits were closed. */
585 static int
587  origin_circuit_t *rend_circ)
588 {
589  int status;
590  char onion_address[HS_SERVICE_ADDR_LEN_BASE32 + 1];
591  const ed25519_public_key_t *service_identity_pk = NULL;
592  const hs_desc_intro_point_t *ip;
593 
594  tor_assert(rend_circ);
595  if (intro_circ_is_ok(intro_circ) < 0) {
596  goto perm_err;
597  }
598 
599  service_identity_pk = &intro_circ->hs_ident->identity_pk;
600  /* For logging purposes. There will be a time where the hs_ident will have a
601  * version number but for now there is none because it's all v3. */
602  hs_build_address(service_identity_pk, HS_VERSION_THREE, onion_address);
603 
604  log_info(LD_REND, "Sending INTRODUCE1 cell to service %s on circuit %u",
605  safe_str_client(onion_address), TO_CIRCUIT(intro_circ)->n_circ_id);
606 
607  /* 1) Get descriptor from our cache. */
608  const hs_descriptor_t *desc =
609  hs_cache_lookup_as_client(service_identity_pk);
610  if (desc == NULL || !hs_client_any_intro_points_usable(service_identity_pk,
611  desc)) {
612  log_info(LD_REND, "Request to %s %s. Trying to fetch a new descriptor.",
613  safe_str_client(onion_address),
614  (desc) ? "didn't have usable intro points" :
615  "didn't have a descriptor");
616  hs_client_refetch_hsdesc(service_identity_pk);
617  /* We just triggered a refetch, make sure every connections are back
618  * waiting for that descriptor. */
619  flag_all_conn_wait_desc(service_identity_pk);
620  /* We just asked for a refetch so this is a transient error. */
621  goto tran_err;
622  }
623 
624  /* We need to find which intro point in the descriptor we are connected to
625  * on intro_circ. */
626  ip = find_desc_intro_point_by_ident(intro_circ->hs_ident, desc);
627  if (ip == NULL) {
628  /* The following is possible if the descriptor was changed while we had
629  * this introduction circuit open and waiting for the rendezvous circuit to
630  * be ready. Which results in this situation where we can't find the
631  * corresponding intro point within the descriptor of the service. */
632  log_info(LD_REND, "Unable to find introduction point for service %s "
633  "while trying to send an INTRODUCE1 cell.",
634  safe_str_client(onion_address));
635  goto perm_err;
636  }
637 
638  /* Send the INTRODUCE1 cell. */
639  if (hs_circ_send_introduce1(intro_circ, rend_circ, ip,
640  &desc->subcredential) < 0) {
641  if (TO_CIRCUIT(intro_circ)->marked_for_close) {
642  /* If the introduction circuit was closed, we were unable to send the
643  * cell for some reasons. In any case, the intro circuit has to be
644  * closed by the above function. We'll return a transient error so tor
645  * can recover and pick a new intro point. To avoid picking that same
646  * intro point, we'll note down the intro point failure so it doesn't
647  * get reused. */
648  hs_cache_client_intro_state_note(service_identity_pk,
649  &intro_circ->hs_ident->intro_auth_pk,
650  INTRO_POINT_FAILURE_GENERIC);
651  }
652  /* It is also possible that the rendezvous circuit was closed due to being
653  * unable to use the rendezvous point node_t so in that case, we also want
654  * to recover and let tor pick a new one. */
655  goto tran_err;
656  }
657 
658  /* Cell has been sent successfully. Copy the introduction point
659  * authentication and encryption key in the rendezvous circuit identifier so
660  * we can compute the ntor keys when we receive the RENDEZVOUS2 cell. */
661  memcpy(&rend_circ->hs_ident->intro_enc_pk, &ip->enc_key,
662  sizeof(rend_circ->hs_ident->intro_enc_pk));
664  &intro_circ->hs_ident->intro_auth_pk);
665 
666  /* Now, we wait for an ACK or NAK on this circuit. */
669  /* Set timestamp_dirty, because circuit_expire_building expects it to
670  * specify when a circuit entered the _C_INTRODUCE_ACK_WAIT state. */
671  TO_CIRCUIT(intro_circ)->timestamp_dirty = time(NULL);
672  pathbias_count_use_attempt(intro_circ);
673 
674  /* Success. */
675  status = 0;
676  goto end;
677 
678  perm_err:
679  /* Permanent error: it is possible that the intro circuit was closed prior
680  * because we weren't able to send the cell. Make sure we don't double close
681  * it which would result in a warning. */
682  if (!TO_CIRCUIT(intro_circ)->marked_for_close) {
683  circuit_mark_for_close(TO_CIRCUIT(intro_circ), END_CIRC_REASON_INTERNAL);
684  }
685  circuit_mark_for_close(TO_CIRCUIT(rend_circ), END_CIRC_REASON_INTERNAL);
686  status = -2;
687  goto end;
688 
689  tran_err:
690  status = -1;
691 
692  end:
693  memwipe(onion_address, 0, sizeof(onion_address));
694  return status;
695 }
696 
697 /** Using the introduction circuit circ, setup the authentication key of the
698  * intro point this circuit has extended to.
699  *
700  * Return 0 if everything went well, otherwise return -1 in the case of errors.
701  */
702 static int
704 {
705  const hs_descriptor_t *desc;
706  const hs_desc_intro_point_t *ip;
707 
708  tor_assert(circ);
709 
711  if (desc == NULL) {
712  /* There is a very small race window between the opening of this circuit
713  * and the client descriptor cache that gets purged (NEWNYM) or the
714  * cleaned up because it expired. Mark the circuit for close so a new
715  * descriptor fetch can occur. */
716  goto err;
717  }
718 
719  /* We will go over every intro point and try to find which one is linked to
720  * that circuit. Those lists are small so it's not that expensive. */
722  circ->build_state->chosen_exit->identity_digest, desc);
723  if (!ip) {
724  /* Reaching this point means we didn't find any intro point for this
725  * circuit which is not supposed to happen. */
726  log_info(LD_REND,"Could not match opened intro circuit with intro point.");
727  goto err;
728  }
729 
730  /* We got it, copy its authentication key to the identifier. */
732  &ip->auth_key_cert->signed_key);
733  return 0;
734 
735  err:
736  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
737  return -1;
738 }
739 
740 /** Called when an introduction circuit has opened. */
741 static void
743 {
744  tor_assert(circ);
746  log_info(LD_REND, "Introduction circuit %u has opened. Attaching streams.",
747  (unsigned int) TO_CIRCUIT(circ)->n_circ_id);
748 
749  /* This is an introduction circuit so we'll attach the correct
750  * authentication key to the circuit identifier so it can be identified
751  * properly later on. */
752  if (setup_intro_circ_auth_key(circ) < 0) {
753  return;
754  }
755 
757 }
758 
759 /** Called when a rendezvous circuit has opened. */
760 static void
762 {
763  tor_assert(circ);
765 
766  const extend_info_t *rp_ei = circ->build_state->chosen_exit;
767 
768  /* Check that we didn't accidentally choose a node that does not understand
769  * the v3 rendezvous protocol */
770  if (rp_ei) {
771  const node_t *rp_node = node_get_by_id(rp_ei->identity_digest);
772  if (rp_node && !node_supports_v3_rendezvous_point(rp_node)) {
773  /* Even tho we checked that this node supported v3 when we created the
774  rendezvous circuit, there is a chance that we might think it does
775  not support v3 anymore. This might happen if we got a new consensus
776  in the meanwhile, where the relay is still listed but its listed
777  descriptor digest has changed and hence we can't access its 'ri' or
778  'md'. */
779  log_info(LD_REND, "Rendezvous node %s did not support v3 after circuit "
780  "has opened.", safe_str_client(extend_info_describe(rp_ei)));
781  return;
782  }
783  }
784 
785  log_info(LD_REND, "Rendezvous circuit has opened to %s.",
786  safe_str_client(extend_info_describe(rp_ei)));
787 
788  /* Ignore returned value, nothing we can really do. On failure, the circuit
789  * will be marked for close. */
791 
792  /* Register rend circuit in circuitmap if it's still alive. */
793  if (!TO_CIRCUIT(circ)->marked_for_close) {
795  circ->hs_ident->rendezvous_cookie);
796  }
797 }
798 
799 /** This is an helper function that convert a descriptor intro point object ip
800  * to a newly allocated extend_info_t object fully initialized. Return NULL if
801  * we can't convert it for which chances are that we are missing or malformed
802  * link specifiers. */
805 {
806  extend_info_t *ei;
807 
808  tor_assert(ip);
809 
810  /* Explicitly put the direct connection option to 0 because this is client
811  * side and there is no such thing as a non anonymous client. */
813 
814  return ei;
815 }
816 
817 /** Return true iff the intro point ip for the service service_pk is usable.
818  * This function checks if the intro point is in the client intro state cache
819  * and checks at the failures. It is considered usable if:
820  * - No error happened (INTRO_POINT_FAILURE_GENERIC)
821  * - It is not flagged as timed out (INTRO_POINT_FAILURE_TIMEOUT)
822  * - The unreachable count is lower than
823  * MAX_INTRO_POINT_REACHABILITY_FAILURES (INTRO_POINT_FAILURE_UNREACHABLE)
824  */
825 static int
827  const hs_desc_intro_point_t *ip)
828 {
829  const hs_cache_intro_state_t *state;
830 
831  tor_assert(service_pk);
832  tor_assert(ip);
833 
834  state = hs_cache_client_intro_state_find(service_pk,
835  &ip->auth_key_cert->signed_key);
836  if (state == NULL) {
837  /* This means we've never encountered any problem thus usable. */
838  goto usable;
839  }
840  if (state->error) {
841  log_info(LD_REND, "Intro point with auth key %s had an error. Not usable",
842  safe_str_client(ed25519_fmt(&ip->auth_key_cert->signed_key)));
843  goto not_usable;
844  }
845  if (state->timed_out) {
846  log_info(LD_REND, "Intro point with auth key %s timed out. Not usable",
847  safe_str_client(ed25519_fmt(&ip->auth_key_cert->signed_key)));
848  goto not_usable;
849  }
851  log_info(LD_REND, "Intro point with auth key %s unreachable. Not usable",
852  safe_str_client(ed25519_fmt(&ip->auth_key_cert->signed_key)));
853  goto not_usable;
854  }
855 
856  usable:
857  return 1;
858  not_usable:
859  return 0;
860 }
861 
862 /** Using a descriptor desc, return a newly allocated extend_info_t object of a
863  * randomly picked introduction point from its list. Return NULL if none are
864  * usable. */
867 {
868  extend_info_t *ei = NULL, *ei_excluded = NULL;
869  smartlist_t *usable_ips = NULL;
870  const hs_descriptor_t *desc;
871  const hs_desc_encrypted_data_t *enc_data;
872  const or_options_t *options = get_options();
873  /* Calculate the onion address for logging purposes */
874  char onion_address[HS_SERVICE_ADDR_LEN_BASE32 + 1];
875 
876  tor_assert(service_pk);
877 
878  desc = hs_cache_lookup_as_client(service_pk);
879  /* Assume the service is v3 if the descriptor is missing. This is ok,
880  * because we only use the address in log messages */
881  hs_build_address(service_pk,
882  desc ? desc->plaintext_data.version : HS_VERSION_THREE,
883  onion_address);
884  if (desc == NULL || !hs_client_any_intro_points_usable(service_pk,
885  desc)) {
886  log_info(LD_REND, "Unable to randomly select an introduction point "
887  "for service %s because descriptor %s. We can't connect.",
888  safe_str_client(onion_address),
889  (desc) ? "doesn't have any usable intro points"
890  : "is missing (assuming v3 onion address)");
891  goto end;
892  }
893 
894  enc_data = &desc->encrypted_data;
895  usable_ips = smartlist_new();
896  smartlist_add_all(usable_ips, enc_data->intro_points);
897  while (smartlist_len(usable_ips) != 0) {
898  int idx;
899  const hs_desc_intro_point_t *ip;
900 
901  /* Pick a random intro point and immediately remove it from the usable
902  * list so we don't pick it again if we have to iterate more. */
903  idx = crypto_rand_int(smartlist_len(usable_ips));
904  ip = smartlist_get(usable_ips, idx);
905  smartlist_del(usable_ips, idx);
906 
907  /* We need to make sure we have a usable intro points which is in a good
908  * state in our cache. */
909  if (!intro_point_is_usable(service_pk, ip)) {
910  continue;
911  }
912 
913  /* Generate an extend info object from the intro point object. */
915  if (ei == NULL) {
916  /* We can get here for instance if the intro point is a private address
917  * and we aren't allowed to extend to those. */
918  log_info(LD_REND, "Unable to select introduction point with auth key %s "
919  "for service %s, because we could not extend to it.",
920  safe_str_client(ed25519_fmt(&ip->auth_key_cert->signed_key)),
921  safe_str_client(onion_address));
922  continue;
923  }
924 
925  /* Test the pick against ExcludeNodes. */
926  if (routerset_contains_extendinfo(options->ExcludeNodes, ei)) {
927  /* If this pick is in the ExcludeNodes list, we keep its reference so if
928  * we ever end up not being able to pick anything else and StrictNodes is
929  * unset, we'll use it. */
930  if (ei_excluded) {
931  /* If something was already here free it. After the loop is gone we
932  * will examine the last excluded intro point, and that's fine since
933  * that's random anyway */
934  extend_info_free(ei_excluded);
935  }
936  ei_excluded = ei;
937  continue;
938  }
939 
940  /* Good pick! Let's go with this. */
941  goto end;
942  }
943 
944  /* Reaching this point means a couple of things. Either we can't use any of
945  * the intro point listed because the IP address can't be extended to or it
946  * is listed in the ExcludeNodes list. In the later case, if StrictNodes is
947  * set, we are forced to not use anything. */
948  ei = ei_excluded;
949  if (options->StrictNodes) {
950  log_warn(LD_REND, "Every introduction point for service %s is in the "
951  "ExcludeNodes set and StrictNodes is set. We can't connect.",
952  safe_str_client(onion_address));
953  extend_info_free(ei);
954  ei = NULL;
955  } else {
956  log_fn(LOG_PROTOCOL_WARN, LD_REND, "Every introduction point for service "
957  "%s is unusable or we can't extend to it. We can't connect.",
958  safe_str_client(onion_address));
959  }
960 
961  end:
962  smartlist_free(usable_ips);
963  memwipe(onion_address, 0, sizeof(onion_address));
964  return ei;
965 }
966 
967 /** Return true iff all intro points for the given service have timed out. */
968 static bool
970 {
971  bool ret = false;
972 
973  tor_assert(service_pk);
974 
975  const hs_descriptor_t *desc = hs_cache_lookup_as_client(service_pk);
976  if (BUG(!desc)) {
977  /* We can't introduce without a descriptor so ending up here means somehow
978  * between the introduction failure and this, the cache entry was removed
979  * which shouldn't be possible in theory. */
980  goto end;
981  }
982 
984  const hs_desc_intro_point_t *, ip) {
985  const hs_cache_intro_state_t *state =
987  &ip->auth_key_cert->signed_key);
988  if (!state || !state->timed_out) {
989  /* No state or if this intro point has not timed out, we are done since
990  * clearly not all of them have timed out. */
991  goto end;
992  }
993  } SMARTLIST_FOREACH_END(ip);
994 
995  /* Exiting the loop here means that all intro points we've looked at have
996  * timed out. Note that we can _not_ have a descriptor without intro points
997  * in the client cache. */
998  ret = true;
999 
1000  end:
1001  return ret;
1002 }
1003 
1004 /** Called when a rendezvous circuit has timed out. Every stream attached to
1005  * the circuit will get set with the SOCKS5_HS_REND_FAILED (0xF3) extended
1006  * error code so if the connection to the rendezvous point ends up not
1007  * working, this code could be sent back as a reason. */
1008 static void
1010 {
1011  tor_assert(rend_circ);
1012 
1013  /* For each entry connection attached to this rendezvous circuit, report
1014  * the error. */
1015  for (edge_connection_t *edge = rend_circ->p_streams; edge;
1016  edge = edge->next_stream) {
1017  entry_connection_t *entry = EDGE_TO_ENTRY_CONN(edge);
1018  if (entry->socks_request) {
1020  SOCKS5_HS_REND_FAILED;
1021  }
1022  }
1023 }
1024 
1025 /** Called when introduction has failed meaning there is no more usable
1026  * introduction points to be used (either NACKed or failed) for the given
1027  * entry connection.
1028  *
1029  * This function only reports back the SOCKS5_HS_INTRO_FAILED (0xF2) code or
1030  * SOCKS5_HS_INTRO_TIMEDOUT (0xF7) if all intros have timed out. The caller
1031  * has to make sure to close the entry connections. */
1032 static void
1034  const ed25519_public_key_t *identity_pk)
1035 {
1036  socks5_reply_status_t code = SOCKS5_HS_INTRO_FAILED;
1037 
1038  tor_assert(conn);
1039  tor_assert(conn->socks_request);
1040  tor_assert(identity_pk);
1041 
1042  if (intro_points_all_timed_out(identity_pk)) {
1043  code = SOCKS5_HS_INTRO_TIMEDOUT;
1044  }
1046 }
1047 
1048 /** For this introduction circuit, we'll look at if we have any usable
1049  * introduction point left for this service. If so, we'll use the circuit to
1050  * re-extend to a new intro point. Else, we'll close the circuit and its
1051  * corresponding rendezvous circuit. Return 0 if we are re-extending else -1
1052  * if we are closing the circuits.
1053  *
1054  * This is called when getting an INTRODUCE_ACK cell with a NACK. */
1055 static int
1057 {
1058  int ret = -1;
1059  const hs_descriptor_t *desc;
1060  origin_circuit_t *rend_circ;
1061 
1062  tor_assert(intro_circ);
1063 
1064  desc = hs_cache_lookup_as_client(&intro_circ->hs_ident->identity_pk);
1065  if (desc == NULL) {
1066  /* We can't continue without a descriptor. This is possible if the cache
1067  * was cleaned up between the intro point established and the reception of
1068  * the introduce ack. */
1069  goto close;
1070  }
1071  /* We still have the descriptor, great! Let's try to see if we can
1072  * re-extend by looking up if there are any usable intro points. */
1074  desc)) {
1075  goto close;
1076  }
1077  /* Try to re-extend now. */
1078  if (hs_client_reextend_intro_circuit(intro_circ) < 0) {
1079  goto close;
1080  }
1081  /* Success on re-extending. Don't return an error. */
1082  ret = 0;
1083  goto end;
1084 
1085  close:
1086  /* Change the intro circuit purpose before so we don't report an intro point
1087  * failure again triggering an extra descriptor fetch. The circuit can
1088  * already be closed on failure to re-extend. */
1089  if (!TO_CIRCUIT(intro_circ)->marked_for_close) {
1090  circuit_change_purpose(TO_CIRCUIT(intro_circ),
1092  circuit_mark_for_close(TO_CIRCUIT(intro_circ), END_CIRC_REASON_FINISHED);
1093  }
1094  /* Close the related rendezvous circuit. */
1096  intro_circ->hs_ident->rendezvous_cookie);
1097  /* The rendezvous circuit might have collapsed while the INTRODUCE_ACK was
1098  * inflight so we can't expect one every time. */
1099  if (rend_circ) {
1100  circuit_mark_for_close(TO_CIRCUIT(rend_circ), END_CIRC_REASON_FINISHED);
1101  }
1102 
1103  end:
1104  return ret;
1105 }
1106 
1107 /** Called when we get an INTRODUCE_ACK success status code. Do the appropriate
1108  * actions for the rendezvous point and finally close intro_circ. */
1109 static void
1111 {
1112  origin_circuit_t *rend_circ = NULL;
1113 
1114  tor_assert(intro_circ);
1115 
1116  log_info(LD_REND, "Received INTRODUCE_ACK ack! Informing rendezvous");
1117 
1118  /* Get the rendezvous circuit for this rendezvous cookie. */
1119  uint8_t *rendezvous_cookie = intro_circ->hs_ident->rendezvous_cookie;
1120  rend_circ =
1122  if (rend_circ == NULL) {
1123  log_info(LD_REND, "Can't find any rendezvous circuit. Stopping");
1124  goto end;
1125  }
1126 
1127  assert_circ_anonymity_ok(rend_circ, get_options());
1128 
1129  /* It is possible to get a RENDEZVOUS2 cell before the INTRODUCE_ACK which
1130  * means that the circuit will be joined and already transmitting data. In
1131  * that case, simply skip the purpose change and close the intro circuit
1132  * like it should be. */
1133  if (TO_CIRCUIT(rend_circ)->purpose == CIRCUIT_PURPOSE_C_REND_JOINED) {
1134  goto end;
1135  }
1138  /* Set timestamp_dirty, because circuit_expire_building expects it to
1139  * specify when a circuit entered the
1140  * CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED state. */
1141  TO_CIRCUIT(rend_circ)->timestamp_dirty = time(NULL);
1142 
1143  end:
1144  /* We don't need the intro circuit anymore. It did what it had to do! */
1145  circuit_change_purpose(TO_CIRCUIT(intro_circ),
1147  circuit_mark_for_close(TO_CIRCUIT(intro_circ), END_CIRC_REASON_FINISHED);
1148 
1149  /* XXX: Close pending intro circuits we might have in parallel. */
1150  return;
1151 }
1152 
1153 /** Called when we get an INTRODUCE_ACK failure status code. Depending on our
1154  * failure cache status, either close the circuit or re-extend to a new
1155  * introduction point. */
1156 static void
1158 {
1159  tor_assert(circ);
1160 
1161  log_info(LD_REND, "Received INTRODUCE_ACK nack by %s. Reason: %u",
1162  safe_str_client(extend_info_describe(circ->build_state->chosen_exit)),
1163  status);
1164 
1165  /* It's a NAK. The introduction point didn't relay our request. */
1167 
1168  /* Note down this failure in the intro point failure cache. Depending on how
1169  * many times we've tried this intro point, close it or reextend. */
1171  &circ->hs_ident->intro_auth_pk,
1172  INTRO_POINT_FAILURE_GENERIC);
1173 }
1174 
1175 /** Called when we get an INTRODUCE_ACK on the intro circuit circ. The encoded
1176  * cell is in payload of length payload_len. Return 0 on success else a
1177  * negative value. The circuit is either close or reuse to re-extend to a new
1178  * introduction point. */
1179 static int
1180 handle_introduce_ack(origin_circuit_t *circ, const uint8_t *payload,
1181  size_t payload_len)
1182 {
1183  int status, ret = -1;
1184 
1185  tor_assert(circ);
1186  tor_assert(circ->build_state);
1188  assert_circ_anonymity_ok(circ, get_options());
1189  tor_assert(payload);
1190 
1191  status = hs_cell_parse_introduce_ack(payload, payload_len);
1192  switch (status) {
1193  case TRUNNEL_HS_INTRO_ACK_STATUS_SUCCESS:
1194  ret = 0;
1196  goto end;
1197  case TRUNNEL_HS_INTRO_ACK_STATUS_UNKNOWN_ID:
1198  case TRUNNEL_HS_INTRO_ACK_STATUS_BAD_FORMAT:
1199  /* It is possible that the intro point can send us an unknown status code
1200  * for the NACK that we do not know about like a new code for instance.
1201  * Just fallthrough so we can note down the NACK and re-extend. */
1202  default:
1203  handle_introduce_ack_bad(circ, status);
1204  /* We are going to see if we have to close the circuits (IP and RP) or we
1205  * can re-extend to a new intro point. */
1206  ret = close_or_reextend_intro_circ(circ);
1207  break;
1208  }
1209 
1210  end:
1211  return ret;
1212 }
1213 
1214 /** Called when we get a RENDEZVOUS2 cell on the rendezvous circuit circ. The
1215  * encoded cell is in payload of length payload_len. Return 0 on success or a
1216  * negative value on error. On error, the circuit is marked for close. */
1217 STATIC int
1218 handle_rendezvous2(origin_circuit_t *circ, const uint8_t *payload,
1219  size_t payload_len)
1220 {
1221  int ret = -1;
1222  curve25519_public_key_t server_pk;
1223  uint8_t auth_mac[DIGEST256_LEN] = {0};
1224  uint8_t handshake_info[CURVE25519_PUBKEY_LEN + sizeof(auth_mac)] = {0};
1226  const hs_ident_circuit_t *ident;
1227 
1228  tor_assert(circ);
1229  tor_assert(payload);
1230 
1231  /* Make things easier. */
1232  ident = circ->hs_ident;
1233  tor_assert(ident);
1234 
1235  if (hs_cell_parse_rendezvous2(payload, payload_len, handshake_info,
1236  sizeof(handshake_info)) < 0) {
1237  goto err;
1238  }
1239  /* Get from the handshake info the SERVER_PK and AUTH_MAC. */
1240  memcpy(&server_pk, handshake_info, CURVE25519_PUBKEY_LEN);
1241  memcpy(auth_mac, handshake_info + CURVE25519_PUBKEY_LEN, sizeof(auth_mac));
1242 
1243  /* Generate the handshake info. */
1244  if (hs_ntor_client_get_rendezvous1_keys(&ident->intro_auth_pk,
1245  &ident->rendezvous_client_kp,
1246  &ident->intro_enc_pk, &server_pk,
1247  &keys) < 0) {
1248  log_info(LD_REND, "Unable to compute the rendezvous keys.");
1249  goto err;
1250  }
1251 
1252  /* Critical check, make sure that the MAC matches what we got with what we
1253  * computed just above. */
1254  if (!hs_ntor_client_rendezvous2_mac_is_good(&keys, auth_mac)) {
1255  log_info(LD_REND, "Invalid MAC in RENDEZVOUS2. Rejecting cell.");
1256  goto err;
1257  }
1258 
1259  /* Setup the e2e encryption on the circuit and finalize its state. */
1260  if (hs_circuit_setup_e2e_rend_circ(circ, keys.ntor_key_seed,
1261  sizeof(keys.ntor_key_seed), 0) < 0) {
1262  log_info(LD_REND, "Unable to setup the e2e encryption.");
1263  goto err;
1264  }
1265  /* Success. Hidden service connection finalized! */
1266  ret = 0;
1267  goto end;
1268 
1269  err:
1270  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_TORPROTOCOL);
1271  end:
1272  memwipe(&keys, 0, sizeof(keys));
1273  return ret;
1274 }
1275 
1276 /** Return true iff the client can fetch a descriptor for this service public
1277  * identity key and status_out if not NULL is untouched. If the client can
1278  * _not_ fetch the descriptor and if status_out is not NULL, it is set with
1279  * the fetch status code. */
1280 static unsigned int
1282  hs_client_fetch_status_t *status_out)
1283 {
1284  hs_client_fetch_status_t status;
1285 
1286  tor_assert(identity_pk);
1287 
1288  /* Are we configured to fetch descriptors? */
1289  if (!get_options()->FetchHidServDescriptors) {
1290  log_warn(LD_REND, "We received an onion address for a hidden service "
1291  "descriptor but we are configured to not fetch.");
1292  status = HS_CLIENT_FETCH_NOT_ALLOWED;
1293  goto cannot;
1294  }
1295 
1296  /* Without a usable consensus we can't do any client actions. It is needed
1297  * to compute the hashring for a service. */
1300  log_info(LD_REND, "Can't fetch descriptor for service %s because we "
1301  "are missing a live consensus. Stalling connection.",
1302  safe_str_client(ed25519_fmt(identity_pk)));
1304  goto cannot;
1305  }
1306 
1308  log_info(LD_REND, "Can't fetch descriptor for service %s because we "
1309  "dont have enough descriptors. Stalling connection.",
1310  safe_str_client(ed25519_fmt(identity_pk)));
1312  goto cannot;
1313  }
1314 
1315  /* Check if fetching a desc for this HS is useful to us right now */
1316  {
1317  const hs_descriptor_t *cached_desc = NULL;
1318  cached_desc = hs_cache_lookup_as_client(identity_pk);
1319  if (cached_desc && hs_client_any_intro_points_usable(identity_pk,
1320  cached_desc)) {
1321  log_info(LD_GENERAL, "We would fetch a v3 hidden service descriptor "
1322  "but we already have a usable descriptor.");
1323  status = HS_CLIENT_FETCH_HAVE_DESC;
1324  goto cannot;
1325  }
1326  }
1327 
1328  /* Don't try to refetch while we have a pending request for it. */
1329  if (directory_request_is_pending(identity_pk)) {
1330  log_info(LD_REND, "Already a pending directory request. Waiting on it.");
1331  status = HS_CLIENT_FETCH_PENDING;
1332  goto cannot;
1333  }
1334 
1335  /* Yes, client can fetch! */
1336  return 1;
1337  cannot:
1338  if (status_out) {
1339  *status_out = status;
1340  }
1341  return 0;
1342 }
1343 
1344 /** Purge the client authorization cache of all ephemeral entries that is the
1345  * entries that are not flagged with CLIENT_AUTH_FLAG_IS_PERMANENT.
1346  *
1347  * This is called from the hs_client_purge_state() used by a SIGNEWNYM. */
1348 STATIC void
1350 {
1351  DIGEST256MAP_FOREACH_MODIFY(client_auths, key,
1353  /* Cleanup every entry that are _NOT_ permanent that is ephemeral. */
1354  if (!(auth->flags & CLIENT_AUTH_FLAG_IS_PERMANENT)) {
1355  MAP_DEL_CURRENT(key);
1356  client_service_authorization_free(auth);
1357  }
1359 
1360  log_info(LD_REND, "Client onion service ephemeral authorization "
1361  "cache has been purged.");
1362 }
1363 
1364 /** Return the client auth in the map using the service identity public key.
1365  * Return NULL if it does not exist in the map. */
1367 find_client_auth(const ed25519_public_key_t *service_identity_pk)
1368 {
1369  /* If the map is not allocated, we can assume that we do not have any client
1370  * auth information. */
1371  if (!client_auths) {
1372  return NULL;
1373  }
1374  return digest256map_get(client_auths, service_identity_pk->pubkey);
1375 }
1376 
1377 /** This is called when a descriptor has arrived following a fetch request and
1378  * has been stored in the client cache. The given entry connections, matching
1379  * the service identity key, will get attached to the service circuit. */
1380 static void
1382 {
1383  time_t now = time(NULL);
1384 
1385  tor_assert(entry_conns);
1386 
1387  SMARTLIST_FOREACH_BEGIN(entry_conns, entry_connection_t *, entry_conn) {
1388  const hs_descriptor_t *desc;
1389  edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(entry_conn);
1390  const ed25519_public_key_t *identity_pk =
1391  &edge_conn->hs_ident->identity_pk;
1392 
1393  /* We were just called because we stored the descriptor for this service
1394  * so not finding a descriptor means we have a bigger problem. */
1395  desc = hs_cache_lookup_as_client(identity_pk);
1396  if (BUG(desc == NULL)) {
1397  goto end;
1398  }
1399 
1400  if (!hs_client_any_intro_points_usable(identity_pk, desc)) {
1401  log_info(LD_REND, "Hidden service descriptor is unusable. "
1402  "Closing streams.");
1403  /* Report the extended socks error code that we were unable to introduce
1404  * to the service. */
1405  socks_mark_introduction_failed(entry_conn, identity_pk);
1406 
1407  connection_mark_unattached_ap(entry_conn,
1408  END_STREAM_REASON_RESOLVEFAILED);
1409  /* We are unable to use the descriptor so remove the directory request
1410  * from the cache so the next connection can try again. */
1411  note_connection_attempt_succeeded(edge_conn->hs_ident);
1412  continue;
1413  }
1414 
1415  log_info(LD_REND, "Descriptor has arrived. Launching circuits.");
1416 
1417  /* Mark connection as waiting for a circuit since we do have a usable
1418  * descriptor now. */
1419  mark_conn_as_waiting_for_circuit(&edge_conn->base_, now);
1420  } SMARTLIST_FOREACH_END(entry_conn);
1421 
1422  end:
1423  return;
1424 }
1425 
1426 /** This is called when a descriptor fetch was successful but the descriptor
1427  * couldn't be decrypted due to missing or bad client authorization. */
1428 static void
1430  hs_desc_decode_status_t status)
1431 {
1432  tor_assert(entry_conns);
1433 
1434  SMARTLIST_FOREACH_BEGIN(entry_conns, entry_connection_t *, entry_conn) {
1435  socks5_reply_status_t code;
1436  if (status == HS_DESC_DECODE_BAD_CLIENT_AUTH) {
1437  code = SOCKS5_HS_BAD_CLIENT_AUTH;
1438  } else if (status == HS_DESC_DECODE_NEED_CLIENT_AUTH) {
1439  code = SOCKS5_HS_MISSING_CLIENT_AUTH;
1440  } else {
1441  /* We should not be called with another type of status. Recover by
1442  * sending a generic error. */
1444  code = SOCKS5_GENERAL_ERROR;
1445  }
1446  entry_conn->socks_request->socks_extended_error_code = code;
1447  connection_mark_unattached_ap(entry_conn, END_STREAM_REASON_MISC);
1448  } SMARTLIST_FOREACH_END(entry_conn);
1449 }
1450 
1451 /** Called when we get a 200 directory fetch status code. */
1452 static void
1454  const smartlist_t *entry_conns, const char *body)
1455 {
1456  hs_desc_decode_status_t decode_status;
1457 
1458  tor_assert(dir_conn);
1459  tor_assert(entry_conns);
1460  tor_assert(body);
1461 
1462  /* We got something: Try storing it in the cache. */
1463  decode_status = hs_cache_store_as_client(body,
1464  &dir_conn->hs_ident->identity_pk);
1465  switch (decode_status) {
1466  case HS_DESC_DECODE_OK:
1467  case HS_DESC_DECODE_NEED_CLIENT_AUTH:
1468  case HS_DESC_DECODE_BAD_CLIENT_AUTH:
1469  log_info(LD_REND, "Stored hidden service descriptor successfully.");
1470  TO_CONN(dir_conn)->purpose = DIR_PURPOSE_HAS_FETCHED_HSDESC;
1471  if (decode_status == HS_DESC_DECODE_OK) {
1472  client_desc_has_arrived(entry_conns);
1473  } else {
1474  /* This handles both client auth decode status. */
1475  client_desc_missing_bad_client_auth(entry_conns, decode_status);
1476  log_info(LD_REND, "Stored hidden service descriptor requires "
1477  "%s client authorization.",
1478  decode_status == HS_DESC_DECODE_NEED_CLIENT_AUTH ? "missing"
1479  : "new");
1480  }
1481  /* Fire control port RECEIVED event. */
1482  hs_control_desc_event_received(dir_conn->hs_ident,
1483  dir_conn->identity_digest);
1484  hs_control_desc_event_content(dir_conn->hs_ident,
1485  dir_conn->identity_digest, body);
1486  break;
1487  case HS_DESC_DECODE_ENCRYPTED_ERROR:
1488  case HS_DESC_DECODE_SUPERENC_ERROR:
1489  case HS_DESC_DECODE_PLAINTEXT_ERROR:
1490  case HS_DESC_DECODE_GENERIC_ERROR:
1491  default:
1492  log_info(LD_REND, "Failed to store hidden service descriptor. "
1493  "Descriptor decoding status: %d", decode_status);
1494  /* Fire control port FAILED event. */
1495  hs_control_desc_event_failed(dir_conn->hs_ident,
1496  dir_conn->identity_digest, "BAD_DESC");
1497  hs_control_desc_event_content(dir_conn->hs_ident,
1498  dir_conn->identity_digest, NULL);
1499  break;
1500  }
1501 }
1502 
1503 /** Called when we get a 404 directory fetch status code. */
1504 static void
1506  const smartlist_t *entry_conns)
1507 {
1508  tor_assert(entry_conns);
1509 
1510  /* Not there. We'll retry when connection_about_to_close_connection() tries
1511  * to clean this conn up. */
1512  log_info(LD_REND, "Fetching hidden service v3 descriptor not found: "
1513  "Retrying at another directory.");
1514  /* Fire control port FAILED event. */
1515  hs_control_desc_event_failed(dir_conn->hs_ident, dir_conn->identity_digest,
1516  "NOT_FOUND");
1517  hs_control_desc_event_content(dir_conn->hs_ident, dir_conn->identity_digest,
1518  NULL);
1519 
1520  /* Flag every entry connections that the descriptor was not found. */
1521  SMARTLIST_FOREACH_BEGIN(entry_conns, entry_connection_t *, entry_conn) {
1523  SOCKS5_HS_NOT_FOUND;
1524  } SMARTLIST_FOREACH_END(entry_conn);
1525 }
1526 
1527 /** Called when we get a 400 directory fetch status code. */
1528 static void
1529 client_dir_fetch_400(dir_connection_t *dir_conn, const char *reason)
1530 {
1531  tor_assert(dir_conn);
1532 
1533  log_warn(LD_REND, "Fetching v3 hidden service descriptor failed: "
1534  "http status 400 (%s). Dirserver didn't like our "
1535  "query? Retrying at another directory.",
1536  escaped(reason));
1537 
1538  /* Fire control port FAILED event. */
1539  hs_control_desc_event_failed(dir_conn->hs_ident, dir_conn->identity_digest,
1540  "QUERY_REJECTED");
1541  hs_control_desc_event_content(dir_conn->hs_ident, dir_conn->identity_digest,
1542  NULL);
1543 }
1544 
1545 /** Called when we get an unexpected directory fetch status code. */
1546 static void
1547 client_dir_fetch_unexpected(dir_connection_t *dir_conn, const char *reason,
1548  const int status_code)
1549 {
1550  tor_assert(dir_conn);
1551 
1552  log_warn(LD_REND, "Fetching v3 hidden service descriptor failed: "
1553  "http status %d (%s) response unexpected from HSDir "
1554  "server %s'. Retrying at another directory.",
1555  status_code, escaped(reason),
1556  connection_describe_peer(TO_CONN(dir_conn)));
1557  /* Fire control port FAILED event. */
1558  hs_control_desc_event_failed(dir_conn->hs_ident, dir_conn->identity_digest,
1559  "UNEXPECTED");
1560  hs_control_desc_event_content(dir_conn->hs_ident, dir_conn->identity_digest,
1561  NULL);
1562 }
1563 
1564 /** Get the full filename for storing the client auth credentials for the
1565  * service in <b>onion_address</b>. The base directory is <b>dir</b>.
1566  * This function never returns NULL. */
1567 static char *
1568 get_client_auth_creds_filename(const char *onion_address,
1569  const char *dir)
1570 {
1571  char *full_fname = NULL;
1572  char *fname;
1573 
1574  tor_asprintf(&fname, "%s.auth_private", onion_address);
1575  full_fname = hs_path_from_filename(dir, fname);
1576  tor_free(fname);
1577 
1578  return full_fname;
1579 }
1580 
1581 /** Permanently store the credentials in <b>creds</b> to disk.
1582  *
1583  * Return -1 if there was an error while storing the credentials, otherwise
1584  * return 0.
1585  */
1586 static int
1588  const hs_client_service_authorization_t *creds)
1589 {
1590  const or_options_t *options = get_options();
1591  char *full_fname = NULL;
1592  char *file_contents = NULL;
1593  char priv_key_b32[BASE32_NOPAD_LEN(CURVE25519_PUBKEY_LEN)+1];
1594  int retval = -1;
1595 
1596  tor_assert(creds->flags & CLIENT_AUTH_FLAG_IS_PERMANENT);
1597 
1598  /* We need ClientOnionAuthDir to be set, otherwise we can't proceed */
1599  if (!options->ClientOnionAuthDir) {
1600  log_warn(LD_GENERAL, "Can't register permanent client auth credentials "
1601  "for %s without ClientOnionAuthDir option. Discarding.",
1602  creds->onion_address);
1603  goto err;
1604  }
1605 
1606  /* Make sure the directory exists and is private enough. */
1607  if (check_private_dir(options->ClientOnionAuthDir, 0, options->User) < 0) {
1608  goto err;
1609  }
1610 
1611  /* Get filename that we should store the credentials */
1612  full_fname = get_client_auth_creds_filename(creds->onion_address,
1613  options->ClientOnionAuthDir);
1614 
1615  /* Encode client private key */
1616  base32_encode(priv_key_b32, sizeof(priv_key_b32),
1617  (char*)creds->enc_seckey.secret_key,
1618  sizeof(creds->enc_seckey.secret_key));
1619 
1620  /* Get the full file contents and write it to disk! */
1621  tor_asprintf(&file_contents, "%s:descriptor:x25519:%s",
1622  creds->onion_address, priv_key_b32);
1623  if (write_str_to_file(full_fname, file_contents, 0) < 0) {
1624  log_warn(LD_GENERAL, "Failed to write client auth creds file for %s!",
1625  creds->onion_address);
1626  goto err;
1627  }
1628 
1629  retval = 0;
1630 
1631  err:
1632  tor_free(file_contents);
1633  tor_free(full_fname);
1634 
1635  return retval;
1636 }
1637 
1638 /** Register the credential <b>creds</b> as part of the client auth subsystem.
1639  *
1640  * Takes ownership of <b>creds</b>.
1641  **/
1642 hs_client_register_auth_status_t
1644 {
1645  ed25519_public_key_t service_identity_pk;
1646  hs_client_service_authorization_t *old_creds = NULL;
1647  hs_client_register_auth_status_t retval = REGISTER_SUCCESS;
1648 
1649  tor_assert(creds);
1650 
1651  if (!client_auths) {
1652  client_auths = digest256map_new();
1653  }
1654 
1655  if (hs_parse_address(creds->onion_address, &service_identity_pk,
1656  NULL, NULL) < 0) {
1657  client_service_authorization_free(creds);
1658  return REGISTER_FAIL_BAD_ADDRESS;
1659  }
1660 
1661  /* If we reach this point, the credentials will be stored one way or another:
1662  * Make them permanent if the user asked us to. */
1663  if (creds->flags & CLIENT_AUTH_FLAG_IS_PERMANENT) {
1664  if (store_permanent_client_auth_credentials(creds) < 0) {
1665  client_service_authorization_free(creds);
1666  return REGISTER_FAIL_PERMANENT_STORAGE;
1667  }
1668  }
1669 
1670  old_creds = digest256map_get(client_auths, service_identity_pk.pubkey);
1671  if (old_creds) {
1672  digest256map_remove(client_auths, service_identity_pk.pubkey);
1673  client_service_authorization_free(old_creds);
1674  retval = REGISTER_SUCCESS_ALREADY_EXISTS;
1675  }
1676 
1677  digest256map_set(client_auths, service_identity_pk.pubkey, creds);
1678 
1679  /** Now that we set the new credentials, also try to decrypt any cached
1680  * descriptors. */
1681  if (hs_cache_client_new_auth_parse(&service_identity_pk)) {
1682  retval = REGISTER_SUCCESS_AND_DECRYPTED;
1683  }
1684 
1685  return retval;
1686 }
1687 
1688 /** Load a client authorization file with <b>filename</b> that is stored under
1689  * the global client auth directory, and return a newly-allocated credentials
1690  * object if it parsed well. Otherwise, return NULL.
1691  */
1694  const or_options_t *options)
1695 {
1696  hs_client_service_authorization_t *auth = NULL;
1697  char *client_key_file_path = NULL;
1698  char *client_key_str = NULL;
1699 
1700  log_info(LD_REND, "Loading a client authorization key file %s...",
1701  filename);
1702 
1703  if (!auth_key_filename_is_valid(filename)) {
1704  log_notice(LD_REND, "Client authorization unrecognized filename %s. "
1705  "File must end in .auth_private. Ignoring.",
1706  filename);
1707  goto err;
1708  }
1709 
1710  /* Create a full path for a file. */
1711  client_key_file_path = hs_path_from_filename(options->ClientOnionAuthDir,
1712  filename);
1713 
1714  client_key_str = read_file_to_str(client_key_file_path, 0, NULL);
1715  if (!client_key_str) {
1716  log_warn(LD_REND, "The file %s cannot be read.", filename);
1717  goto err;
1718  }
1719 
1720  auth = parse_auth_file_content(client_key_str);
1721  if (!auth) {
1722  goto err;
1723  }
1724 
1725  err:
1726  tor_free(client_key_str);
1727  tor_free(client_key_file_path);
1728 
1729  return auth;
1730 }
1731 
1732 /*
1733  * Remove the file in <b>filename</b> under the global client auth credential
1734  * storage.
1735  */
1736 static void
1737 remove_client_auth_creds_file(const char *filename)
1738 {
1739  char *creds_file_path = NULL;
1740  const or_options_t *options = get_options();
1741 
1742  creds_file_path = hs_path_from_filename(options->ClientOnionAuthDir,
1743  filename);
1744  if (tor_unlink(creds_file_path) != 0) {
1745  log_warn(LD_REND, "Failed to remove client auth file (%s).",
1746  creds_file_path);
1747  goto end;
1748  }
1749 
1750  log_warn(LD_REND, "Successfully removed client auth file (%s).",
1751  creds_file_path);
1752 
1753  end:
1754  tor_free(creds_file_path);
1755 }
1756 
1757 /**
1758  * Find the filesystem file corresponding to the permanent client auth
1759  * credentials in <b>cred</b> and remove it.
1760  */
1761 static void
1764 {
1765  smartlist_t *file_list = NULL;
1766  const or_options_t *options = get_options();
1767 
1769 
1770  if (!options->ClientOnionAuthDir) {
1771  log_warn(LD_REND, "Found permanent credential but no ClientOnionAuthDir "
1772  "configured. There is no file to be removed.");
1773  goto end;
1774  }
1775 
1776  file_list = tor_listdir(options->ClientOnionAuthDir);
1777  if (file_list == NULL) {
1778  log_warn(LD_REND, "Client authorization key directory %s can't be listed.",
1779  options->ClientOnionAuthDir);
1780  goto end;
1781  }
1782 
1783  SMARTLIST_FOREACH_BEGIN(file_list, const char *, filename) {
1784  hs_client_service_authorization_t *tmp_cred = NULL;
1785 
1786  tmp_cred = get_creds_from_client_auth_filename(filename, options);
1787  if (!tmp_cred) {
1788  continue;
1789  }
1790 
1791  /* Find the right file for this credential */
1792  if (!strcmp(tmp_cred->onion_address, cred->onion_address)) {
1793  /* Found it! Remove the file! */
1794  remove_client_auth_creds_file(filename);
1795  /* cleanup and get out of here */
1796  client_service_authorization_free(tmp_cred);
1797  break;
1798  }
1799 
1800  client_service_authorization_free(tmp_cred);
1801  } SMARTLIST_FOREACH_END(filename);
1802 
1803  end:
1804  if (file_list) {
1805  SMARTLIST_FOREACH(file_list, char *, s, tor_free(s));
1806  smartlist_free(file_list);
1807  }
1808 }
1809 
1810 /** Remove client auth credentials for the service <b>hs_address</b>. */
1811 hs_client_removal_auth_status_t
1813 {
1814  ed25519_public_key_t service_identity_pk;
1815 
1816  if (!client_auths) {
1817  return REMOVAL_SUCCESS_NOT_FOUND;
1818  }
1819 
1820  if (hs_parse_address(hsaddress, &service_identity_pk, NULL, NULL) < 0) {
1821  return REMOVAL_BAD_ADDRESS;
1822  }
1823 
1824  hs_client_service_authorization_t *cred = NULL;
1825  cred = digest256map_remove(client_auths, service_identity_pk.pubkey);
1826 
1827  /* digestmap_remove() returns the previously stored data if there were any */
1828  if (cred) {
1829  if (cred->flags & CLIENT_AUTH_FLAG_IS_PERMANENT) {
1830  /* These creds are stored on disk: remove the corresponding file. */
1832  }
1833 
1834  /* Remove associated descriptor if any. */
1835  hs_cache_remove_as_client(&service_identity_pk);
1836 
1837  client_service_authorization_free(cred);
1838  return REMOVAL_SUCCESS;
1839  }
1840 
1841  return REMOVAL_SUCCESS_NOT_FOUND;
1842 }
1843 
1844 /** Get the HS client auth map. */
1845 digest256map_t *
1847 {
1848  return client_auths;
1849 }
1850 
1851 /* ========== */
1852 /* Public API */
1853 /* ========== */
1854 
1855 /** Called when a circuit was just cleaned up. This is done right before the
1856  * circuit is marked for close. */
1857 void
1859 {
1860  bool has_timed_out;
1861 
1862  tor_assert(circ);
1864 
1865  has_timed_out =
1866  (circ->marked_for_close_orig_reason == END_CIRC_REASON_TIMEOUT);
1867 
1868  switch (circ->purpose) {
1873  /* Report extended SOCKS error code when a rendezvous circuit times out.
1874  * This MUST be done on_close() because it is possible the entry
1875  * connection would get closed before the circuit is freed and thus
1876  * would fail to report the error code. */
1877  if (has_timed_out) {
1878  socks_mark_rend_circuit_timed_out(CONST_TO_ORIGIN_CIRCUIT(circ));
1879  }
1880  break;
1881  default:
1882  break;
1883  }
1884 }
1885 
1886 /** Called when a circuit was just cleaned up. This is done right before the
1887  * circuit is freed. */
1888 void
1890 {
1891  bool has_timed_out;
1892  rend_intro_point_failure_t failure = INTRO_POINT_FAILURE_GENERIC;
1893  const origin_circuit_t *orig_circ = NULL;
1894 
1895  tor_assert(circ);
1897 
1898  orig_circ = CONST_TO_ORIGIN_CIRCUIT(circ);
1899  tor_assert(orig_circ->hs_ident);
1900 
1901  has_timed_out =
1902  (circ->marked_for_close_orig_reason == END_CIRC_REASON_TIMEOUT);
1903  if (has_timed_out) {
1904  failure = INTRO_POINT_FAILURE_TIMEOUT;
1905  }
1906 
1907  switch (circ->purpose) {
1909  log_info(LD_REND, "Failed v3 intro circ for service %s to intro point %s "
1910  "(awaiting ACK). Failure code: %d",
1911  safe_str_client(ed25519_fmt(&orig_circ->hs_ident->identity_pk)),
1912  safe_str_client(build_state_get_exit_nickname(orig_circ->build_state)),
1913  failure);
1915  &orig_circ->hs_ident->intro_auth_pk,
1916  failure);
1917  break;
1919  if (has_timed_out || !orig_circ->build_state) {
1920  break;
1921  }
1922  failure = INTRO_POINT_FAILURE_UNREACHABLE;
1923  log_info(LD_REND, "Failed v3 intro circ for service %s to intro point %s "
1924  "(while building circuit). Marking as unreachable.",
1925  safe_str_client(ed25519_fmt(&orig_circ->hs_ident->identity_pk)),
1926  safe_str_client(build_state_get_exit_nickname(orig_circ->build_state)));
1928  &orig_circ->hs_ident->intro_auth_pk,
1929  failure);
1930  break;
1931  default:
1932  break;
1933  }
1934 }
1935 
1936 /** A circuit just finished connecting to a hidden service that the stream
1937  * <b>conn</b> has been waiting for. Let the HS subsystem know about this. */
1938 void
1940 {
1942 
1943  if (conn->hs_ident) { /* It's v3: pass it to the prop224 handler */
1944  note_connection_attempt_succeeded(conn->hs_ident);
1945  return;
1946  }
1947 }
1948 
1949 /** With the given encoded descriptor in desc_str and the service key in
1950  * service_identity_pk, decode the descriptor and set the desc pointer with a
1951  * newly allocated descriptor object.
1952  *
1953  * On success, HS_DESC_DECODE_OK is returned and desc is set to the decoded
1954  * descriptor. On error, desc is set to NULL and a decoding error status is
1955  * returned depending on what was the issue. */
1957 hs_client_decode_descriptor(const char *desc_str,
1958  const ed25519_public_key_t *service_identity_pk,
1959  hs_descriptor_t **desc)
1960 {
1962  hs_subcredential_t subcredential;
1963  ed25519_public_key_t blinded_pubkey;
1964  hs_client_service_authorization_t *client_auth = NULL;
1965  curve25519_secret_key_t *client_auth_sk = NULL;
1966 
1967  tor_assert(desc_str);
1968  tor_assert(service_identity_pk);
1969  tor_assert(desc);
1970 
1971  /* Check if we have a client authorization for this service in the map. */
1972  client_auth = find_client_auth(service_identity_pk);
1973  if (client_auth) {
1974  client_auth_sk = &client_auth->enc_seckey;
1975  }
1976 
1977  /* Create subcredential for this HS so that we can decrypt */
1978  {
1979  uint64_t current_time_period = hs_get_time_period_num(0);
1980  hs_build_blinded_pubkey(service_identity_pk, NULL, 0, current_time_period,
1981  &blinded_pubkey);
1982  hs_get_subcredential(service_identity_pk, &blinded_pubkey, &subcredential);
1983  }
1984 
1985  /* Parse descriptor */
1986  ret = hs_desc_decode_descriptor(desc_str, &subcredential,
1987  client_auth_sk, desc);
1988  memwipe(&subcredential, 0, sizeof(subcredential));
1989  if (ret != HS_DESC_DECODE_OK) {
1990  goto err;
1991  }
1992 
1993  /* Make sure the descriptor signing key cross certifies with the computed
1994  * blinded key. Without this validation, anyone knowing the subcredential
1995  * and onion address can forge a descriptor. */
1996  tor_cert_t *cert = (*desc)->plaintext_data.signing_key_cert;
1997  if (tor_cert_checksig(cert,
1998  &blinded_pubkey, approx_time()) < 0) {
1999  log_warn(LD_GENERAL, "Descriptor signing key certificate signature "
2000  "doesn't validate with computed blinded key: %s",
2002  ret = HS_DESC_DECODE_GENERIC_ERROR;
2003  goto err;
2004  }
2005 
2006  return HS_DESC_DECODE_OK;
2007  err:
2008  return ret;
2009 }
2010 
2011 /** Return true iff there are at least one usable intro point in the service
2012  * descriptor desc. */
2013 int
2015  const hs_descriptor_t *desc)
2016 {
2017  tor_assert(service_pk);
2018  tor_assert(desc);
2019 
2021  const hs_desc_intro_point_t *, ip) {
2022  if (intro_point_is_usable(service_pk, ip)) {
2023  goto usable;
2024  }
2025  } SMARTLIST_FOREACH_END(ip);
2026 
2027  return 0;
2028  usable:
2029  return 1;
2030 }
2031 
2032 /** Launch a connection to a hidden service directory to fetch a hidden
2033  * service descriptor using <b>identity_pk</b> to get the necessary keys.
2034  *
2035  * A hs_client_fetch_status_t code is returned. */
2036 int
2038 {
2039  hs_client_fetch_status_t status;
2040 
2041  tor_assert(identity_pk);
2042 
2043  if (!can_client_refetch_desc(identity_pk, &status)) {
2044  return status;
2045  }
2046 
2047  /* Try to fetch the desc and if we encounter an unrecoverable error, mark
2048  * the desc as unavailable for now. */
2049  status = fetch_v3_desc(identity_pk);
2050  if (fetch_status_should_close_socks(status)) {
2051  close_all_socks_conns_waiting_for_desc(identity_pk, status,
2052  END_STREAM_REASON_RESOLVEFAILED);
2053  /* Remove HSDir fetch attempts so that we can retry later if the user
2054  * wants us to regardless of if we closed any connections. */
2055  purge_hid_serv_request(identity_pk);
2056  }
2057  return status;
2058 }
2059 
2060 /** This is called when we are trying to attach an AP connection to these
2061  * hidden service circuits from connection_ap_handshake_attach_circuit().
2062  * Return 0 on success, -1 for a transient error that is actions were
2063  * triggered to recover or -2 for a permenent error where both circuits will
2064  * marked for close.
2065  *
2066  * The following supports every hidden service version. */
2067 int
2069  origin_circuit_t *rend_circ)
2070 {
2071  return send_introduce1(intro_circ, rend_circ);
2072 }
2073 
2074 /** Called when the client circuit circ has been established. It can be either
2075  * an introduction or rendezvous circuit. This function handles all hidden
2076  * service versions. */
2077 void
2079 {
2080  tor_assert(circ);
2081 
2082  switch (TO_CIRCUIT(circ)->purpose) {
2084  if (circ->hs_ident) {
2086  }
2087  break;
2089  if (circ->hs_ident) {
2091  }
2092  break;
2093  default:
2095  }
2096 }
2097 
2098 /** Called when we receive a RENDEZVOUS_ESTABLISHED cell. Change the state of
2099  * the circuit to CIRCUIT_PURPOSE_C_REND_READY. Return 0 on success else a
2100  * negative value and the circuit marked for close. */
2101 int
2103  const uint8_t *payload, size_t payload_len)
2104 {
2105  tor_assert(circ);
2106  tor_assert(payload);
2107 
2108  (void) payload_len;
2109 
2110  if (TO_CIRCUIT(circ)->purpose != CIRCUIT_PURPOSE_C_ESTABLISH_REND) {
2111  log_warn(LD_PROTOCOL, "Got a RENDEZVOUS_ESTABLISHED but we were not "
2112  "expecting one. Closing circuit.");
2113  goto err;
2114  }
2115 
2116  log_info(LD_REND, "Received an RENDEZVOUS_ESTABLISHED. This circuit is "
2117  "now ready for rendezvous.");
2119 
2120  /* Set timestamp_dirty, because circuit_expire_building expects it to
2121  * specify when a circuit entered the _C_REND_READY state. */
2122  TO_CIRCUIT(circ)->timestamp_dirty = time(NULL);
2123 
2124  /* From a path bias point of view, this circuit is now successfully used.
2125  * Waiting any longer opens us up to attacks from malicious hidden services.
2126  * They could induce the client to attempt to connect to their hidden
2127  * service and never reply to the client's rend requests */
2129 
2130  /* If we already have the introduction circuit built, make sure we send
2131  * the INTRODUCE cell _now_ */
2133 
2134  return 0;
2135  err:
2136  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_TORPROTOCOL);
2137  return -1;
2138 }
2139 
2140 void
2141 client_service_authorization_free_(hs_client_service_authorization_t *auth)
2142 {
2143  if (!auth) {
2144  return;
2145  }
2146 
2147  tor_free(auth->client_name);
2148 
2149  memwipe(auth, 0, sizeof(*auth));
2150  tor_free(auth);
2151 }
2152 
2153 /** Helper for digest256map_free. */
2154 static void
2156 {
2157  client_service_authorization_free_(auth);
2158 }
2159 
2160 static void
2161 client_service_authorization_free_all(void)
2162 {
2163  if (!client_auths) {
2164  return;
2165  }
2167 }
2168 
2169 /** Check if the auth key file name is valid or not. Return 1 if valid,
2170  * otherwise return 0. */
2171 STATIC int
2172 auth_key_filename_is_valid(const char *filename)
2173 {
2174  int ret = 1;
2175  const char *valid_extension = ".auth_private";
2176 
2177  tor_assert(filename);
2178 
2179  /* The length of the filename must be greater than the length of the
2180  * extension and the valid extension must be at the end of filename. */
2181  if (!strcmpend(filename, valid_extension) &&
2182  strlen(filename) != strlen(valid_extension)) {
2183  ret = 1;
2184  } else {
2185  ret = 0;
2186  }
2187 
2188  return ret;
2189 }
2190 
2191 /** Parse the client auth credentials off a string in <b>client_key_str</b>
2192  * based on the file format documented in the "Client side configuration"
2193  * section of rend-spec-v3.txt.
2194  *
2195  * Return NULL if there was an error, otherwise return a newly allocated
2196  * hs_client_service_authorization_t structure.
2197  */
2199 parse_auth_file_content(const char *client_key_str)
2200 {
2201  char *onion_address = NULL;
2202  char *auth_type = NULL;
2203  char *key_type = NULL;
2204  char *seckey_b32 = NULL;
2205  hs_client_service_authorization_t *auth = NULL;
2206  smartlist_t *fields = smartlist_new();
2207 
2208  tor_assert(client_key_str);
2209 
2210  smartlist_split_string(fields, client_key_str, ":",
2211  SPLIT_SKIP_SPACE, 0);
2212  /* Wrong number of fields. */
2213  if (smartlist_len(fields) != 4) {
2214  goto err;
2215  }
2216 
2217  onion_address = smartlist_get(fields, 0);
2218  auth_type = smartlist_get(fields, 1);
2219  key_type = smartlist_get(fields, 2);
2220  seckey_b32 = smartlist_get(fields, 3);
2221 
2222  /* Currently, the only supported auth type is "descriptor" and the only
2223  * supported key type is "x25519". */
2224  if (strcmp(auth_type, "descriptor") || strcmp(key_type, "x25519")) {
2225  goto err;
2226  }
2227 
2228  if (strlen(seckey_b32) != BASE32_NOPAD_LEN(CURVE25519_SECKEY_LEN)) {
2229  log_warn(LD_REND, "Client authorization encoded base32 private key "
2230  "length is invalid: %s", seckey_b32);
2231  goto err;
2232  }
2233 
2234  auth = tor_malloc_zero(sizeof(hs_client_service_authorization_t));
2235  if (base32_decode((char *) auth->enc_seckey.secret_key,
2236  sizeof(auth->enc_seckey.secret_key),
2237  seckey_b32, strlen(seckey_b32)) !=
2238  sizeof(auth->enc_seckey.secret_key)) {
2239  log_warn(LD_REND, "Client authorization encoded base32 private key "
2240  "can't be decoded: %s", seckey_b32);
2241  goto err;
2242  }
2243 
2244  if (fast_mem_is_zero((const char*)auth->enc_seckey.secret_key,
2245  sizeof(auth->enc_seckey.secret_key))) {
2246  log_warn(LD_REND, "Client authorization private key can't be all-zeroes");
2247  goto err;
2248  }
2249 
2250  strncpy(auth->onion_address, onion_address, HS_SERVICE_ADDR_LEN_BASE32);
2251 
2252  /* We are reading this from the disk, so set the permanent flag anyway. */
2253  auth->flags |= CLIENT_AUTH_FLAG_IS_PERMANENT;
2254 
2255  /* Success. */
2256  goto done;
2257 
2258  err:
2259  client_service_authorization_free(auth);
2260  done:
2261  /* It is also a good idea to wipe the private key. */
2262  if (seckey_b32) {
2263  memwipe(seckey_b32, 0, strlen(seckey_b32));
2264  }
2265  tor_assert(fields);
2266  SMARTLIST_FOREACH(fields, char *, s, tor_free(s));
2267  smartlist_free(fields);
2268  return auth;
2269 }
2270 
2271 /** From a set of <b>options</b>, setup every client authorization detail
2272  * found. Return 0 on success or -1 on failure. If <b>validate_only</b>
2273  * is set, parse, warn and return as normal, but don't actually change
2274  * the configuration. */
2275 int
2277  int validate_only)
2278 {
2279  int ret = -1;
2280  digest256map_t *auths = digest256map_new();
2281  smartlist_t *file_list = NULL;
2282 
2283  tor_assert(options);
2284 
2285  /* There is no client auth configured. We can just silently ignore this
2286  * function. */
2287  if (!options->ClientOnionAuthDir) {
2288  ret = 0;
2289  goto end;
2290  }
2291 
2292  /* Make sure the directory exists and is private enough. */
2293  if (check_private_dir(options->ClientOnionAuthDir, 0, options->User) < 0) {
2294  goto end;
2295  }
2296 
2297  file_list = tor_listdir(options->ClientOnionAuthDir);
2298  if (file_list == NULL) {
2299  log_warn(LD_REND, "Client authorization key directory %s can't be listed.",
2300  options->ClientOnionAuthDir);
2301  goto end;
2302  }
2303 
2304  SMARTLIST_FOREACH_BEGIN(file_list, const char *, filename) {
2305  hs_client_service_authorization_t *auth = NULL;
2306  ed25519_public_key_t identity_pk;
2307 
2308  auth = get_creds_from_client_auth_filename(filename, options);
2309  if (!auth) {
2310  continue;
2311  }
2312 
2313  /* Parse the onion address to get an identity public key and use it
2314  * as a key of global map in the future. */
2315  if (hs_parse_address(auth->onion_address, &identity_pk,
2316  NULL, NULL) < 0) {
2317  log_warn(LD_REND, "The onion address \"%s\" is invalid in "
2318  "file %s", filename, auth->onion_address);
2319  client_service_authorization_free(auth);
2320  continue;
2321  }
2322 
2323  if (digest256map_get(auths, identity_pk.pubkey)) {
2324  log_warn(LD_REND, "Duplicate authorization for the same hidden "
2325  "service address %s.",
2326  safe_str_client_opts(options, auth->onion_address));
2327  client_service_authorization_free(auth);
2328  goto end;
2329  }
2330 
2331  digest256map_set(auths, identity_pk.pubkey, auth);
2332  log_info(LD_REND, "Loaded a client authorization key file %s.",
2333  filename);
2334  } SMARTLIST_FOREACH_END(filename);
2335 
2336  /* Success. */
2337  ret = 0;
2338 
2339  end:
2340  if (file_list) {
2341  SMARTLIST_FOREACH(file_list, char *, s, tor_free(s));
2342  smartlist_free(file_list);
2343  }
2344 
2345  if (!validate_only && ret == 0) {
2346  client_service_authorization_free_all();
2347  client_auths = auths;
2348  } else {
2349  digest256map_free(auths, client_service_authorization_free_void);
2350  }
2351 
2352  return ret;
2353 }
2354 
2355 /** Called when a descriptor directory fetch is done.
2356  *
2357  * Act accordingly on all entry connections depending on the HTTP status code
2358  * we got. In case of an error, the SOCKS error is set (if ExtendedErrors is
2359  * set).
2360  *
2361  * The reason is a human readable string returned by the directory server
2362  * which can describe the status of the request. The body is the response
2363  * content, on 200 code it is the descriptor itself. Finally, the status_code
2364  * is the HTTP code returned by the directory server. */
2365 void
2366 hs_client_dir_fetch_done(dir_connection_t *dir_conn, const char *reason,
2367  const char *body, const int status_code)
2368 {
2369  smartlist_t *entry_conns;
2370 
2371  tor_assert(dir_conn);
2372  tor_assert(body);
2373 
2374  /* Get all related entry connections. */
2375  entry_conns = find_entry_conns(&dir_conn->hs_ident->identity_pk);
2376 
2377  switch (status_code) {
2378  case 200:
2379  client_dir_fetch_200(dir_conn, entry_conns, body);
2380  break;
2381  case 404:
2382  client_dir_fetch_404(dir_conn, entry_conns);
2383  break;
2384  case 400:
2385  client_dir_fetch_400(dir_conn, reason);
2386  break;
2387  default:
2388  client_dir_fetch_unexpected(dir_conn, reason, status_code);
2389  break;
2390  }
2391 
2392  /* We don't have ownership of the objects in this list. */
2393  smartlist_free(entry_conns);
2394 }
2395 
2396 /** Return a newly allocated extend_info_t for a randomly chosen introduction
2397  * point for the given edge connection identifier ident. Return NULL if we
2398  * can't pick any usable introduction points. */
2399 extend_info_t *
2401 {
2402  tor_assert(edge_conn);
2403 
2404  return client_get_random_intro(&edge_conn->hs_ident->identity_pk);
2405 }
2406 
2407 /** Called when get an INTRODUCE_ACK cell on the introduction circuit circ.
2408  * Return 0 on success else a negative value is returned. The circuit will be
2409  * closed or reuse to extend again to another intro point. */
2410 int
2412  const uint8_t *payload, size_t payload_len)
2413 {
2414  int ret = -1;
2415 
2416  tor_assert(circ);
2417  tor_assert(payload);
2418 
2419  if (TO_CIRCUIT(circ)->purpose != CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT) {
2420  log_warn(LD_PROTOCOL, "Unexpected INTRODUCE_ACK on circuit %u.",
2421  (unsigned int) TO_CIRCUIT(circ)->n_circ_id);
2422  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_TORPROTOCOL);
2423  goto end;
2424  }
2425 
2426  ret = handle_introduce_ack(circ, payload, payload_len);
2427  /* For path bias: This circuit was used successfully. NACK or ACK counts. */
2429 
2430  end:
2431  return ret;
2432 }
2433 
2434 /** Called when get a RENDEZVOUS2 cell on the rendezvous circuit circ. Return
2435  * 0 on success else a negative value is returned. The circuit will be closed
2436  * on error. */
2437 int
2439  const uint8_t *payload, size_t payload_len)
2440 {
2441  int ret = -1;
2442 
2443  tor_assert(circ);
2444  tor_assert(payload);
2445 
2446  /* Circuit can possibly be in both state because we could receive a
2447  * RENDEZVOUS2 cell before the INTRODUCE_ACK has been received. */
2448  if (TO_CIRCUIT(circ)->purpose != CIRCUIT_PURPOSE_C_REND_READY &&
2450  log_warn(LD_PROTOCOL, "Unexpected RENDEZVOUS2 cell on circuit %u. "
2451  "Closing circuit.",
2452  (unsigned int) TO_CIRCUIT(circ)->n_circ_id);
2453  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_TORPROTOCOL);
2454  goto end;
2455  }
2456 
2457  log_info(LD_REND, "Got RENDEZVOUS2 cell from hidden service on circuit %u.",
2458  TO_CIRCUIT(circ)->n_circ_id);
2459 
2460  ret = handle_rendezvous2(circ, payload, payload_len);
2461 
2462  end:
2463  return ret;
2464 }
2465 
2466 /** Extend the introduction circuit circ to another valid introduction point
2467  * for the hidden service it is trying to connect to, or mark it and launch a
2468  * new circuit if we can't extend it. Return 0 on success or possible
2469  * success. Return -1 and mark the introduction circuit for close on permanent
2470  * failure.
2471  *
2472  * On failure, the caller is responsible for marking the associated rendezvous
2473  * circuit for close. */
2474 int
2476 {
2477  int ret = -1;
2478  extend_info_t *ei;
2479 
2480  tor_assert(circ);
2481 
2483  if (ei == NULL) {
2484  log_warn(LD_REND, "No usable introduction points left. Closing.");
2485  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
2486  goto end;
2487  }
2488 
2489  if (circ->remaining_relay_early_cells) {
2490  log_info(LD_REND, "Re-extending circ %u, this time to %s.",
2491  (unsigned int) TO_CIRCUIT(circ)->n_circ_id,
2492  safe_str_client(extend_info_describe(ei)));
2493  ret = circuit_extend_to_new_exit(circ, ei);
2494  if (ret == 0) {
2495  /* We were able to extend so update the timestamp so we avoid expiring
2496  * this circuit too early. The intro circuit is short live so the
2497  * linkability issue is minimized, we just need the circuit to hold a
2498  * bit longer so we can introduce. */
2499  TO_CIRCUIT(circ)->timestamp_dirty = time(NULL);
2500  }
2501  } else {
2502  log_info(LD_REND, "Closing intro circ %u (out of RELAY_EARLY cells).",
2503  (unsigned int) TO_CIRCUIT(circ)->n_circ_id);
2504  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_FINISHED);
2505  /* connection_ap_handshake_attach_circuit will launch a new intro circ. */
2506  ret = 0;
2507  }
2508 
2509  end:
2510  extend_info_free(ei);
2511  return ret;
2512 }
2513 
2514 /** Close all client introduction circuits related to the given descriptor.
2515  * This is called with a descriptor that is about to get replaced in the
2516  * client cache.
2517  *
2518  * Even though the introduction point might be exactly the same, we'll rebuild
2519  * them if needed but the odds are very low that an existing matching
2520  * introduction circuit exists at that stage. */
2521 void
2523 {
2524  origin_circuit_t *ocirc = NULL;
2525 
2526  tor_assert(desc);
2527 
2528  /* We iterate over all client intro circuits because they aren't kept in the
2529  * HS circuitmap. That is probably something we want to do one day. */
2530  while ((ocirc = circuit_get_next_intro_circ(ocirc, true))) {
2531  if (ocirc->hs_ident == NULL) {
2532  /* Not a v3 circuit, ignore it. */
2533  continue;
2534  }
2535 
2536  /* Does it match any IP in the given descriptor? If not, ignore. */
2537  if (find_desc_intro_point_by_ident(ocirc->hs_ident, desc) == NULL) {
2538  continue;
2539  }
2540 
2541  /* We have a match. Close the circuit as consider it expired. */
2542  circuit_mark_for_close(TO_CIRCUIT(ocirc), END_CIRC_REASON_FINISHED);
2543  }
2544 }
2545 
2546 /** Release all the storage held by the client subsystem. */
2547 void
2549 {
2550  /* Purge the hidden service request cache. */
2552  client_service_authorization_free_all();
2553 }
2554 
2555 /** Purge all potentially remotely-detectable state held in the hidden
2556  * service client code. Called on SIGNAL NEWNYM. */
2557 void
2559 {
2560  /* Cancel all descriptor fetches. Do this first so once done we are sure
2561  * that our descriptor cache won't modified. */
2562  cancel_descriptor_fetches();
2563  /* Purge the introduction point state cache. */
2565  /* Purge the descriptor cache. */
2567  /* Purge the last hidden service request cache. */
2569  /* Purge ephemeral client authorization. */
2571 
2572  log_info(LD_REND, "Hidden service client state has been purged.");
2573 }
2574 
2575 /** Called when our directory information has changed. */
2576 void
2578 {
2579  /* We have possibly reached the minimum directory information or new
2580  * consensus so retry all pending SOCKS connection in
2581  * AP_CONN_STATE_RENDDESC_WAIT state in order to fetch the descriptor. */
2583 }
2584 
2585 #ifdef TOR_UNIT_TESTS
2586 
2587 STATIC void
2588 set_hs_client_auths_map(digest256map_t *map)
2589 {
2590  client_auths = map;
2591 }
2592 
2593 #endif /* defined(TOR_UNIT_TESTS) */
close_or_reextend_intro_circ
static int close_or_reextend_intro_circ(origin_circuit_t *intro_circ)
Definition: hs_client.c:1056
log_fn
#define log_fn(severity, domain, args,...)
Definition: log.h:283
hs_circuit_setup_e2e_rend_circ
int hs_circuit_setup_e2e_rend_circ(origin_circuit_t *circ, const uint8_t *ntor_key_seed, size_t seed_len, int is_service_side)
Definition: hs_circuit.c:1008
HS_CLIENT_FETCH_HAVE_DESC
@ HS_CLIENT_FETCH_HAVE_DESC
Definition: hs_client.h:25
tor_free
#define tor_free(p)
Definition: malloc.h:52
connection_edge.h
Header file for connection_edge.c.
CURVE25519_PUBKEY_LEN
#define CURVE25519_PUBKEY_LEN
Definition: x25519_sizes.h:20
get_client_auth_creds_filename
static char * get_client_auth_creds_filename(const char *onion_address, const char *dir)
Definition: hs_client.c:1568
smartlist_split_string
int smartlist_split_string(smartlist_t *sl, const char *str, const char *sep, int flags, int max)
Definition: smartlist_split.c:37
hs_cache_store_as_client
hs_desc_decode_status_t hs_cache_store_as_client(const char *desc_str, const ed25519_public_key_t *identity_pk)
Definition: hs_cache.c:863
circuit_t::purpose
uint8_t purpose
Definition: circuit_st.h:111
hs_config_client_authorization
int hs_config_client_authorization(const or_options_t *options, int validate_only)
Definition: hs_client.c:2276
hs_cache_client_intro_state_note
void hs_cache_client_intro_state_note(const ed25519_public_key_t *service_pk, const ed25519_public_key_t *auth_key, rend_intro_point_failure_t failure)
Definition: hs_cache.c:958
hs_client_circuit_has_opened
void hs_client_circuit_has_opened(origin_circuit_t *circ)
Definition: hs_client.c:2078
routerstatus_describe
const char * routerstatus_describe(const routerstatus_t *rs)
Definition: describe.c:203
hs_ntor_client_rendezvous2_mac_is_good
int hs_ntor_client_rendezvous2_mac_is_good(const hs_ntor_rend_cell_keys_t *hs_ntor_rend_cell_keys, const uint8_t *rcvd_mac)
Definition: hs_ntor.c:594
hs_desc_decode_status_t
hs_desc_decode_status_t
Definition: hs_descriptor.h:74
entry_connection_st.h
Entry connection structure.
tor_cert_t
Definition: torcert.h:30
hs_ident.h
Header file containing circuit and connection identifier data for the whole HS subsystem.
memwipe
void memwipe(void *mem, uint8_t byte, size_t sz)
Definition: crypto_util.c:55
ED25519_BASE64_LEN
#define ED25519_BASE64_LEN
Definition: x25519_sizes.h:43
circuit_get_next_intro_circ
origin_circuit_t * circuit_get_next_intro_circ(const origin_circuit_t *start, bool want_client_circ)
Definition: circuitlist.c:1686
note_connection_attempt_succeeded
static void note_connection_attempt_succeeded(const hs_ident_edge_conn_t *hs_conn_ident)
Definition: hs_client.c:355
directory_initiate_request
void directory_initiate_request(directory_request_t *request)
Definition: dirclient.c:1190
approx_time
time_t approx_time(void)
Definition: approx_time.c:32
MOCK_IMPL
#define MOCK_IMPL(rv, funcname, arglist)
Definition: testsupport.h:133
intro_circ_is_ok
static int intro_circ_is_ok(const origin_circuit_t *circ)
Definition: hs_client.c:495
hs_client_fetch_status_t
hs_client_fetch_status_t
Definition: hs_client.h:19
hs_client_receive_introduce_ack
int hs_client_receive_introduce_ack(origin_circuit_t *circ, const uint8_t *payload, size_t payload_len)
Definition: hs_client.c:2411
desc_intro_point_to_extend_info
STATIC extend_info_t * desc_intro_point_to_extend_info(const hs_desc_intro_point_t *ip)
Definition: hs_client.c:804
circuit_extend_to_new_exit
int circuit_extend_to_new_exit(origin_circuit_t *circ, extend_info_t *exit_ei)
Definition: circuitbuild.c:2093
dir_connection_t::identity_digest
char identity_digest[DIGEST_LEN]
Definition: dir_connection_st.h:54
HS_CLIENT_FETCH_ERROR
@ HS_CLIENT_FETCH_ERROR
Definition: hs_client.h:21
HS_CLIENT_FETCH_NO_HSDIRS
@ HS_CLIENT_FETCH_NO_HSDIRS
Definition: hs_client.h:27
or_options_t::User
char * User
Definition: or_options_st.h:162
parse_auth_file_content
STATIC hs_client_service_authorization_t * parse_auth_file_content(const char *client_key_str)
Definition: hs_client.c:2199
socks5_reply_status_t
socks5_reply_status_t
Definition: socks5_status.h:20
hs_ident_intro_circ_is_valid
int hs_ident_intro_circ_is_valid(const hs_ident_circuit_t *ident)
Definition: hs_ident.c:104
hs_desc_encrypted_data_t
Definition: hs_descriptor.h:158
routerset_contains_extendinfo
int routerset_contains_extendinfo(const routerset_t *set, const extend_info_t *ei)
Definition: routerset.c:308
AP_CONN_STATE_CIRCUIT_WAIT
#define AP_CONN_STATE_CIRCUIT_WAIT
Definition: connection_edge.h:49
hs_client_circuit_cleanup_on_free
void hs_client_circuit_cleanup_on_free(const circuit_t *circ)
Definition: hs_client.c:1889
tor_assert
#define tor_assert(expr)
Definition: util_bug.h:102
hs_desc_intro_point_t::link_specifiers
smartlist_t * link_specifiers
Definition: hs_descriptor.h:102
CONN_TYPE_DIR
#define CONN_TYPE_DIR
Definition: connection.h:55
microdesc.h
Header file for microdesc.c.
ed25519_pubkey_eq
int ed25519_pubkey_eq(const ed25519_public_key_t *key1, const ed25519_public_key_t *key2)
Definition: crypto_ed25519.c:642
hs_circ_send_establish_rendezvous
int hs_circ_send_establish_rendezvous(origin_circuit_t *circ)
Definition: hs_circuit.c:1118
cpath_build_state_st.h
Circuit-build-stse structure.
hs_cache_intro_state_t
Definition: hs_cache.h:34
hs_ident_circuit_t::identity_pk
ed25519_public_key_t identity_pk
Definition: hs_ident.h:45
fast_mem_is_zero
int fast_mem_is_zero(const char *mem, size_t len)
Definition: util_string.c:74
circuituse.h
Header file for circuituse.c.
LD_GENERAL
#define LD_GENERAL
Definition: log.h:62
DIGESTMAP_FOREACH_END
#define DIGESTMAP_FOREACH_END
Definition: map.h:168
describe.h
Header file for describe.c.
smartlist_add_all
void smartlist_add_all(smartlist_t *s1, const smartlist_t *s2)
Definition: smartlist_core.c:125
purge_hid_serv_request
static void purge_hid_serv_request(const ed25519_public_key_t *identity_pk)
Definition: hs_client.c:198
pathbias_count_use_attempt
void pathbias_count_use_attempt(origin_circuit_t *circ)
Definition: circpathbias.c:604
store_permanent_client_auth_credentials
static int store_permanent_client_auth_credentials(const hs_client_service_authorization_t *creds)
Definition: hs_client.c:1587
hs_client_note_connection_attempt_succeeded
void hs_client_note_connection_attempt_succeeded(const edge_connection_t *conn)
Definition: hs_client.c:1939
node_get_by_id
const node_t * node_get_by_id(const char *identity_digest)
Definition: nodelist.c:226
handle_introduce_ack_success
static void handle_introduce_ack_success(origin_circuit_t *intro_circ)
Definition: hs_client.c:1110
smartlist_add
void smartlist_add(smartlist_t *sl, void *element)
Definition: smartlist_core.c:117
HS_CLIENT_FETCH_MISSING_INFO
@ HS_CLIENT_FETCH_MISSING_INFO
Definition: hs_client.h:31
hs_descriptor_t::plaintext_data
hs_desc_plaintext_data_t plaintext_data
Definition: hs_descriptor.h:228
hs_desc_plaintext_data_t::version
uint32_t version
Definition: hs_descriptor.h:196
CIRCUIT_PURPOSE_C_REND_JOINED
#define CIRCUIT_PURPOSE_C_REND_JOINED
Definition: circuitlist.h:88
routerstatus_t
Definition: routerstatus_st.h:19
ed25519_pubkey_copy
void ed25519_pubkey_copy(ed25519_public_key_t *dest, const ed25519_public_key_t *src)
Definition: crypto_ed25519.c:654
setup_intro_circ_auth_key
static int setup_intro_circ_auth_key(origin_circuit_t *circ)
Definition: hs_client.c:703
client_dir_fetch_unexpected
static void client_dir_fetch_unexpected(dir_connection_t *dir_conn, const char *reason, const int status_code)
Definition: hs_client.c:1547
hs_build_address
void hs_build_address(const ed25519_public_key_t *key, uint8_t version, char *addr_out)
Definition: hs_common.c:901
client_service_authorization_free_void
static void client_service_authorization_free_void(void *auth)
Definition: hs_client.c:2155
hs_control_desc_event_failed
void hs_control_desc_event_failed(const hs_ident_dir_conn_t *ident, const char *hsdir_id_digest, const char *reason)
Definition: hs_control.c:65
hs_client_any_intro_points_usable
int hs_client_any_intro_points_usable(const ed25519_public_key_t *service_pk, const hs_descriptor_t *desc)
Definition: hs_client.c:2014
CLIENT_AUTH_FLAG_IS_PERMANENT
#define CLIENT_AUTH_FLAG_IS_PERMANENT
Definition: hs_client.h:63
tor_cert_checksig
int tor_cert_checksig(tor_cert_t *cert, const ed25519_public_key_t *pubkey, time_t now)
Definition: torcert.c:244
smartlist_new
smartlist_t * smartlist_new(void)
Definition: smartlist_core.c:26
reasons.h
Header file for reasons.c.
hs_desc_intro_point_t::auth_key_cert
tor_cert_t * auth_key_cert
Definition: hs_descriptor.h:111
hs_client_launch_v3_desc_fetch
void hs_client_launch_v3_desc_fetch(const ed25519_public_key_t *onion_identity_pk, const smartlist_t *hsdirs)
Definition: hs_client.c:476
socks_request_st.h
Client request structure.
CIRCUIT_IS_ORIGIN
#define CIRCUIT_IS_ORIGIN(c)
Definition: circuitlist.h:146
HS_CLIENT_FETCH_NOT_ALLOWED
@ HS_CLIENT_FETCH_NOT_ALLOWED
Definition: hs_client.h:29
CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT
#define CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT
Definition: circuitlist.h:76
ed25519_public_to_base64
void ed25519_public_to_base64(char *output, const ed25519_public_key_t *pkey)
Definition: crypto_format.c:227
hs_client_dir_fetch_done
void hs_client_dir_fetch_done(dir_connection_t *dir_conn, const char *reason, const char *body, const int status_code)
Definition: hs_client.c:2366
strcmpend
int strcmpend(const char *s1, const char *s2)
Definition: util_string.c:251
intro_points_all_timed_out
static bool intro_points_all_timed_out(const ed25519_public_key_t *service_pk)
Definition: hs_client.c:969
hs_control_desc_event_content
void hs_control_desc_event_content(const hs_ident_dir_conn_t *ident, const char *hsdir_id_digest, const char *body)
Definition: hs_control.c:178
SMARTLIST_FOREACH
#define SMARTLIST_FOREACH(sl, type, var, cmd)
Definition: smartlist_foreach.h:112
hs_client_receive_rendezvous2
int hs_client_receive_rendezvous2(origin_circuit_t *circ, const uint8_t *payload, size_t payload_len)
Definition: hs_client.c:2438
crypto_rand_int
int crypto_rand_int(unsigned int max)
Definition: crypto_rand_numeric.c:52
extend_info_describe
const char * extend_info_describe(const extend_info_t *ei)
Definition: describe.c:224
hs_cell.h
Header file containing cell data for the whole HS subsystem.
base32_decode
int base32_decode(char *dest, size_t destlen, const char *src, size_t srclen)
Definition: binascii.c:90
build_state_get_exit_nickname
const char * build_state_get_exit_nickname(cpath_build_state_t *state)
Definition: circuitbuild.c:2501
hs_circ_send_introduce1
int hs_circ_send_introduce1(origin_circuit_t *intro_circ, origin_circuit_t *rend_circ, const hs_desc_intro_point_t *ip, const hs_subcredential_t *subcredential)
Definition: hs_circuit.c:1039
networkstatus.h
Header file for networkstatus.c.
hs_control_desc_event_requested
void hs_control_desc_event_requested(const ed25519_public_key_t *onion_pk, const char *base64_blinded_pk, const routerstatus_t *hsdir_rs)
Definition: hs_control.c:29
CIRCUIT_PURPOSE_C_ESTABLISH_REND
#define CIRCUIT_PURPOSE_C_ESTABLISH_REND
Definition: circuitlist.h:81
hs_client_purge_state
void hs_client_purge_state(void)
Definition: hs_client.c:2558
hs_client.h
Header file containing client data for the HS subsystem.
base32_encode
void base32_encode(char *dest, size_t destlen, const char *src, size_t srclen)
Definition: binascii.c:60
ed25519_fmt
const char * ed25519_fmt(const ed25519_public_key_t *pkey)
Definition: crypto_format.c:193
hs_client_get_random_intro_from_edge
extend_info_t * hs_client_get_random_intro_from_edge(const edge_connection_t *edge_conn)
Definition: hs_client.c:2400
crypto_util.h
Common functions for cryptographic routines.
hs_purge_last_hid_serv_requests
void hs_purge_last_hid_serv_requests(void)
Definition: hs_common.c:1481
hs_client_receive_rendezvous_acked
int hs_client_receive_rendezvous_acked(origin_circuit_t *circ, const uint8_t *payload, size_t payload_len)
Definition: hs_client.c:2102
hs_cache.h
Header file for hs_cache.c.
mark_conn_as_waiting_for_circuit
static void mark_conn_as_waiting_for_circuit(connection_t *conn, time_t now)
Definition: hs_client.c:248
socks_request_t::socks_extended_error_code
socks5_reply_status_t socks_extended_error_code
Definition: socks_request_st.h:72
ENTRY_TO_EDGE_CONN
#define ENTRY_TO_EDGE_CONN(c)
Definition: entry_connection_st.h:102
hs_cache_purge_as_client
void hs_cache_purge_as_client(void)
Definition: hs_cache.c:940
hs_circuitmap_get_established_rend_circ_client_side
origin_circuit_t * hs_circuitmap_get_established_rend_circ_client_side(const uint8_t *cookie)
Definition: hs_circuitmap.c:447
circuitlist.h
Header file for circuitlist.c.
hs_desc_intro_point_t::enc_key
curve25519_public_key_t enc_key
Definition: hs_descriptor.h:114
write_str_to_file
int write_str_to_file(const char *fname, const char *str, int bin)
Definition: files.c:274
DIGEST_LEN
#define DIGEST_LEN
Definition: digest_sizes.h:20
hs_pick_hsdir
routerstatus_t * hs_pick_hsdir(smartlist_t *responsible_dirs, const char *req_key_str, bool *is_rate_limited_out)
Definition: hs_common.c:1509
circuit_t::marked_for_close_orig_reason
int marked_for_close_orig_reason
Definition: circuit_st.h:201
pick_hsdir_v3
STATIC routerstatus_t * pick_hsdir_v3(const ed25519_public_key_t *onion_identity_pk)
Definition: hs_client.c:420
CONN_TYPE_AP
#define CONN_TYPE_AP
Definition: connection.h:51
crypto_format.h
Header for crypto_format.c.
cpath_build_state_t::chosen_exit
extend_info_t * chosen_exit
Definition: cpath_build_state_st.h:20
DIR_PURPOSE_FETCH_HSDESC
#define DIR_PURPOSE_FETCH_HSDESC
Definition: directory.h:69
find_desc_intro_point_by_legacy_id
static hs_desc_intro_point_t * find_desc_intro_point_by_legacy_id(const char *legacy_id, const hs_descriptor_t *desc)
Definition: hs_client.c:546
handle_rendezvous2
STATIC int handle_rendezvous2(origin_circuit_t *circ, const uint8_t *payload, size_t payload_len)
Definition: hs_client.c:1218
TO_ENTRY_CONN
entry_connection_t * TO_ENTRY_CONN(connection_t *c)
Definition: connection_edge.c:200
intro_point_is_usable
static int intro_point_is_usable(const ed25519_public_key_t *service_pk, const hs_desc_intro_point_t *ip)
Definition: hs_client.c:826
hs_ident_circuit_t::intro_auth_pk
ed25519_public_key_t intro_auth_pk
Definition: hs_ident.h:51
connection_ap_mark_as_waiting_for_renddesc
void connection_ap_mark_as_waiting_for_renddesc(entry_connection_t *entry_conn)
Definition: connection_edge.c:1429
hs_path_from_filename
char * hs_path_from_filename(const char *directory, const char *filename)
Definition: hs_common.c:178
tor_assert_nonfatal_unreached
#define tor_assert_nonfatal_unreached()
Definition: util_bug.h:176
get_hs_client_auths_map
digest256map_t * get_hs_client_auths_map(void)
Definition: hs_client.c:1846
hs_cache_client_intro_state_purge
void hs_cache_client_intro_state_purge(void)
Definition: hs_cache.c:1010
node_t
Definition: node_st.h:34
origin_circuit_t
Definition: origin_circuit_st.h:79
directory_request_set_routerstatus
void directory_request_set_routerstatus(directory_request_t *req, const routerstatus_t *status)
Definition: dirclient.c:1117
hs_ident_dir_conn_init
void hs_ident_dir_conn_init(const ed25519_public_key_t *identity_pk, const ed25519_public_key_t *blinded_pk, hs_ident_dir_conn_t *ident)
Definition: hs_ident.c:69
client_auths
static digest256map_t * client_auths
Definition: hs_client.c:50
connection_describe_peer
const char * connection_describe_peer(const connection_t *conn)
Definition: connection.c:528
hs_circuitmap_get_rend_circ_client_side
origin_circuit_t * hs_circuitmap_get_rend_circ_client_side(const uint8_t *cookie)
Definition: hs_circuitmap.c:416
directory.h
Header file for directory.c.
hs_desc_decode_descriptor
hs_desc_decode_status_t hs_desc_decode_descriptor(const char *encoded, const hs_subcredential_t *subcredential, const curve25519_secret_key_t *client_auth_sk, hs_descriptor_t **desc_out)
Definition: hs_descriptor.c:2570
ed25519_public_key_t
Definition: crypto_ed25519.h:23
or_options_t::ExcludeNodes
struct routerset_t * ExcludeNodes
Definition: or_options_st.h:120
hs_client_send_introduce1
int hs_client_send_introduce1(origin_circuit_t *intro_circ, origin_circuit_t *rend_circ)
Definition: hs_client.c:2068
hs_cache_lookup_as_client
const hs_descriptor_t * hs_cache_lookup_as_client(const ed25519_public_key_t *key)
Definition: hs_cache.c:832
networkstatus_get_reasonably_live_consensus
networkstatus_t * networkstatus_get_reasonably_live_consensus(time_t now, int flavor)
Definition: networkstatus.c:1477
client_dir_fetch_404
static void client_dir_fetch_404(dir_connection_t *dir_conn, const smartlist_t *entry_conns)
Definition: hs_client.c:1505
MAX_INTRO_POINT_REACHABILITY_FAILURES
#define MAX_INTRO_POINT_REACHABILITY_FAILURES
Definition: or.h:951
LD_REND
#define LD_REND
Definition: log.h:84
escaped
const char * escaped(const char *s)
Definition: escape.c:126
usable_consensus_flavor
int usable_consensus_flavor(void)
Definition: microdesc.c:1086
tor_unlink
int tor_unlink(const char *pathname)
Definition: files.c:154
or_options_t::StrictNodes
int StrictNodes
Definition: or_options_st.h:117
hs_cache_remove_as_client
void hs_cache_remove_as_client(const ed25519_public_key_t *key)
Definition: hs_cache.c:899
circuit_change_purpose
void circuit_change_purpose(circuit_t *circ, uint8_t new_purpose)
Definition: circuituse.c:3074
smartlist_del
void smartlist_del(smartlist_t *sl, int idx)
Definition: smartlist_core.c:214
connection_ap_attach_pending
void connection_ap_attach_pending(int retry)
Definition: connection_edge.c:1288
AP_CONN_STATE_RENDDESC_WAIT
#define AP_CONN_STATE_RENDDESC_WAIT
Definition: connection_edge.h:44
connection_t::marked_for_close
uint16_t marked_for_close
Definition: connection_st.h:149
circuit_t
Definition: circuit_st.h:61
nodelist.h
Header file for nodelist.c.
hs_control.h
Header file containing control port event related code.
hs_ident_dir_conn_t
Definition: hs_ident.h:87
hs_descriptor_t
Definition: hs_descriptor.h:226
hs_client_close_intro_circuits_from_desc
void hs_client_close_intro_circuits_from_desc(const hs_descriptor_t *desc)
Definition: hs_client.c:2522
flag_all_conn_wait_desc
static void flag_all_conn_wait_desc(const ed25519_public_key_t *service_identity_pk)
Definition: hs_client.c:172
routerset.h
Header file for routerset.c.
hs_purge_hid_serv_from_last_hid_serv_requests
void hs_purge_hid_serv_from_last_hid_serv_requests(const char *req_key_str)
Definition: hs_common.c:1441
close_all_socks_conns_waiting_for_desc
static void close_all_socks_conns_waiting_for_desc(const ed25519_public_key_t *identity_pk, hs_client_fetch_status_t status, int reason)
Definition: hs_client.c:269
assert_connection_ok
void assert_connection_ok(connection_t *conn, time_t now)
Definition: connection.c:5533
directory_request_is_pending
static int directory_request_is_pending(const ed25519_public_key_t *identity_pk)
Definition: hs_client.c:219
find_client_auth
static hs_client_service_authorization_t * find_client_auth(const ed25519_public_key_t *service_identity_pk)
Definition: hs_client.c:1367
client_desc_missing_bad_client_auth
static void client_desc_missing_bad_client_auth(const smartlist_t *entry_conns, hs_desc_decode_status_t status)
Definition: hs_client.c:1429
hs_cache_intro_state_t::timed_out
unsigned int timed_out
Definition: hs_cache.h:42
DIGEST256_LEN
#define DIGEST256_LEN
Definition: digest_sizes.h:23
hs_cell_parse_rendezvous2
int hs_cell_parse_rendezvous2(const uint8_t *payload, size_t payload_len, uint8_t *handshake_info, size_t handshake_info_len)
Definition: hs_cell.c:1022
extendinfo.h
Header for core/or/extendinfo.c.
hs_cache_intro_state_t::error
unsigned int error
Definition: hs_cache.h:39
tor_cert_describe_signature_status
const char * tor_cert_describe_signature_status(const tor_cert_t *cert)
Definition: torcert.c:279
hs_desc_intro_point_t::onion_key
curve25519_public_key_t onion_key
Definition: hs_descriptor.h:106
fetch_v3_desc
STATIC hs_client_fetch_status_t fetch_v3_desc(const ed25519_public_key_t *onion_identity_pk)
Definition: hs_client.c:457
fetch_status_should_close_socks
static int fetch_status_should_close_socks(hs_client_fetch_status_t status)
Definition: hs_client.c:81
fast_memneq
#define fast_memneq(a, b, c)
Definition: di_ops.h:42
connection_t
Definition: connection_st.h:45
pathbias_mark_use_success
void pathbias_mark_use_success(origin_circuit_t *circ)
Definition: circpathbias.c:661
hs_client_refetch_hsdesc
int hs_client_refetch_hsdesc(const ed25519_public_key_t *identity_pk)
Definition: hs_client.c:2037
hs_ident_dir_conn_t::identity_pk
ed25519_public_key_t identity_pk
Definition: hs_ident.h:90
hs_client_service_authorization_t
Definition: hs_client.h:66
crypto_rand.h
Common functions for using (pseudo-)random number generators.
HS_CLIENT_FETCH_LAUNCHED
@ HS_CLIENT_FETCH_LAUNCHED
Definition: hs_client.h:23
entry_connection_t::socks_request
socks_request_t * socks_request
Definition: entry_connection_st.h:27
get_options
const or_options_t * get_options(void)
Definition: config.c:917
hs_circuitmap_register_rend_circ_client_side
void hs_circuitmap_register_rend_circ_client_side(origin_circuit_t *or_circ, const uint8_t *cookie)
Definition: hs_circuitmap.c:498
origin_circuit_t::build_state
cpath_build_state_t * build_state
Definition: origin_circuit_st.h:123
get_creds_from_client_auth_filename
static hs_client_service_authorization_t * get_creds_from_client_auth_filename(const char *filename, const or_options_t *options)
Definition: hs_client.c:1693
circuitbuild.h
Header file for circuitbuild.c.
TO_EDGE_CONN
edge_connection_t * TO_EDGE_CONN(connection_t *c)
Definition: connection_edge.c:174
hs_get_responsible_hsdirs
void hs_get_responsible_hsdirs(const ed25519_public_key_t *blinded_pk, uint64_t time_period_num, int use_second_hsdir_index, int for_fetching, smartlist_t *responsible_dirs)
Definition: hs_common.c:1224
client_dir_fetch_400
static void client_dir_fetch_400(dir_connection_t *dir_conn, const char *reason)
Definition: hs_client.c:1529
connection_edge_is_rendezvous_stream
int connection_edge_is_rendezvous_stream(const edge_connection_t *conn)
Definition: connection_edge.c:4353
origin_circuit_t::remaining_relay_early_cells
unsigned int remaining_relay_early_cells
Definition: origin_circuit_st.h:146
directory_request_set_resource
void directory_request_set_resource(directory_request_t *req, const char *resource)
Definition: dirclient.c:1015
fetch_status_to_string
static const char * fetch_status_to_string(hs_client_fetch_status_t status)
Definition: hs_client.c:56
hs_client_dir_info_changed
void hs_client_dir_info_changed(void)
Definition: hs_client.c:2577
extend_info_st.h
Extend-info structure.
CIRCUIT_PURPOSE_C_INTRODUCE_ACKED
#define CIRCUIT_PURPOSE_C_INTRODUCE_ACKED
Definition: circuitlist.h:79
curve25519_public_key_t
Definition: crypto_curve25519.h:24
socks_mark_rend_circuit_timed_out
static void socks_mark_rend_circuit_timed_out(const origin_circuit_t *rend_circ)
Definition: hs_client.c:1009
DIR_PURPOSE_HAS_FETCHED_HSDESC
#define DIR_PURPOSE_HAS_FETCHED_HSDESC
Definition: directory.h:72
hs_client_service_authorization_t::client_name
char * client_name
Definition: hs_client.h:75
purge_ephemeral_client_auth
STATIC void purge_ephemeral_client_auth(void)
Definition: hs_client.c:1349
hs_control_desc_event_received
void hs_control_desc_event_received(const hs_ident_dir_conn_t *ident, const char *hsdir_id_digest)
Definition: hs_control.c:89
CIRCUIT_PURPOSE_C_REND_READY
#define CIRCUIT_PURPOSE_C_REND_READY
Definition: circuitlist.h:83
connection.h
Header file for connection.c.
extend_info_t::identity_digest
char identity_digest[DIGEST_LEN]
Definition: extend_info_st.h:31
directory_request_new
directory_request_t * directory_request_new(uint8_t dir_purpose)
Definition: dirclient.c:919
hs_client_service_authorization_t::enc_seckey
curve25519_secret_key_t enc_seckey
Definition: hs_client.h:69
hs_get_extend_info_from_lspecs
extend_info_t * hs_get_extend_info_from_lspecs(const smartlist_t *lspecs, const curve25519_public_key_t *onion_key, int direct_conn)
Definition: hs_common.c:1596
hs_subcredential_t
Definition: hs_ntor.h:43
stream_end_reason_to_string
const char * stream_end_reason_to_string(int reason)
Definition: reasons.c:64
hs_client_decode_descriptor
hs_desc_decode_status_t hs_client_decode_descriptor(const char *desc_str, const ed25519_public_key_t *service_identity_pk, hs_descriptor_t **desc)
Definition: hs_client.c:1957
hs_ident_circuit_t
Definition: hs_ident.h:42
curve25519_secret_key_t
Definition: crypto_curve25519.h:33
dirclient.h
Header file for dirclient.c.
node_supports_v3_rendezvous_point
bool node_supports_v3_rendezvous_point(const node_t *node)
Definition: nodelist.c:1271
CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED
#define CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED
Definition: circuitlist.h:86
hs_cell_parse_introduce_ack
int hs_cell_parse_introduce_ack(const uint8_t *payload, size_t payload_len)
Definition: hs_cell.c:999
safe_str_client_opts
const char * safe_str_client_opts(const or_options_t *options, const char *address)
Definition: config.c:1070
tor_asprintf
int tor_asprintf(char **strp, const char *fmt,...)
Definition: printf.c:75
hs_client_free_all
void hs_client_free_all(void)
Definition: hs_client.c:2548
hs_get_time_period_num
uint64_t hs_get_time_period_num(time_t now)
Definition: hs_common.c:269
SMARTLIST_FOREACH_BEGIN
#define SMARTLIST_FOREACH_BEGIN(sl, type, var)
Definition: smartlist_foreach.h:78
socks_mark_introduction_failed
static void socks_mark_introduction_failed(entry_connection_t *conn, const ed25519_public_key_t *identity_pk)
Definition: hs_client.c:1033
hs_client_circuit_cleanup_on_close
void hs_client_circuit_cleanup_on_close(const circuit_t *circ)
Definition: hs_client.c:1858
hs_ident_circuit_t::rendezvous_cookie
uint8_t rendezvous_cookie[HS_REND_COOKIE_LEN]
Definition: hs_ident.h:60
hs_cache_client_intro_state_find
const hs_cache_intro_state_t * hs_cache_client_intro_state_find(const ed25519_public_key_t *service_pk, const ed25519_public_key_t *auth_key)
Definition: hs_cache.c:980
client_intro_circ_has_opened
static void client_intro_circ_has_opened(origin_circuit_t *circ)
Definition: hs_client.c:742
HS_VERSION_THREE
#define HS_VERSION_THREE
Definition: hs_common.h:23
connection_t::timestamp_last_write_allowed
time_t timestamp_last_write_allowed
Definition: connection_st.h:106
dir_connection_st.h
Client/server directory connection structure.
directory_request_fetch_set_hs_ident
void directory_request_fetch_set_hs_ident(directory_request_t *req, const hs_ident_dir_conn_t *ident)
Definition: dirclient.c:1080
MAP_DEL_CURRENT
#define MAP_DEL_CURRENT(keyvar)
Definition: map.h:140
client_rendezvous_circ_has_opened
static void client_rendezvous_circ_has_opened(origin_circuit_t *circ)
Definition: hs_client.c:761
hs_ntor_rend_cell_keys_t
Definition: hs_ntor.h:30
hs_desc_encrypted_data_t::intro_points
smartlist_t * intro_points
Definition: hs_descriptor.h:171
hs_descriptor_t::encrypted_data
hs_desc_encrypted_data_t encrypted_data
Definition: hs_descriptor.h:238
edge_connection_t
Definition: edge_connection_st.h:21
client_get_random_intro
STATIC extend_info_t * client_get_random_intro(const ed25519_public_key_t *service_pk)
Definition: hs_client.c:866
client_dir_fetch_200
static void client_dir_fetch_200(dir_connection_t *dir_conn, const smartlist_t *entry_conns, const char *body)
Definition: hs_client.c:1453
hs_cache_intro_state_t::unreachable_count
uint32_t unreachable_count
Definition: hs_cache.h:45
hs_build_blinded_pubkey
void hs_build_blinded_pubkey(const ed25519_public_key_t *pk, const uint8_t *secret, size_t secret_len, uint64_t time_period_num, ed25519_public_key_t *blinded_pk_out)
Definition: hs_common.c:927
TO_DIR_CONN
dir_connection_t * TO_DIR_CONN(connection_t *c)
Definition: directory.c:88
hs_ntor.h
Header for hs_ntor.c.
hs_circuitmap.h
Header file for hs_circuitmap.c.
hs_client_register_auth_credentials
hs_client_register_auth_status_t hs_client_register_auth_credentials(hs_client_service_authorization_t *creds)
Definition: hs_client.c:1643
client_desc_has_arrived
static void client_desc_has_arrived(const smartlist_t *entry_conns)
Definition: hs_client.c:1381
or_options_t::ClientOnionAuthDir
char * ClientOnionAuthDir
Definition: or_options_st.h:431
find_desc_intro_point_by_ident
static const hs_desc_intro_point_t * find_desc_intro_point_by_ident(const hs_ident_circuit_t *ident, const hs_descriptor_t *desc)
Definition: hs_client.c:522
handle_introduce_ack_bad
static void handle_introduce_ack_bad(origin_circuit_t *circ, int status)
Definition: hs_client.c:1157
config.h
Header file for config.c.
retry_all_socks_conn_waiting_for_desc
STATIC void retry_all_socks_conn_waiting_for_desc(void)
Definition: hs_client.c:299
hs_ident_edge_conn_t
Definition: hs_ident.h:103
can_client_refetch_desc
static unsigned int can_client_refetch_desc(const ed25519_public_key_t *identity_pk, hs_client_fetch_status_t *status_out)
Definition: hs_client.c:1281
hs_descriptor_t::subcredential
hs_subcredential_t subcredential
Definition: hs_descriptor.h:242
send_introduce1
static int send_introduce1(origin_circuit_t *intro_circ, origin_circuit_t *rend_circ)
Definition: hs_client.c:586
connection_t::timestamp_created
time_t timestamp_created
Definition: connection_st.h:109
hs_parse_address
int hs_parse_address(const char *address, ed25519_public_key_t *key_out, uint8_t *checksum_out, uint8_t *version_out)
Definition: hs_common.c:840
connection_t::state
uint8_t state
Definition: connection_st.h:49
origin_circuit_t::hs_ident
struct hs_ident_circuit_t * hs_ident
Definition: origin_circuit_st.h:133
origin_circuit_t::p_streams
edge_connection_t * p_streams
Definition: origin_circuit_st.h:84
TO_CIRCUIT
#define TO_CIRCUIT(x)
Definition: or.h:845
edge_connection_t::next_stream
struct edge_connection_t * next_stream
Definition: edge_connection_st.h:24
or_options_t
Definition: or_options_st.h:64
tor_cert_t::signed_key
ed25519_public_key_t signed_key
Definition: torcert.h:32
TO_CONN
#define TO_CONN(c)
Definition: or.h:616
STATIC
#define STATIC
Definition: testsupport.h:32
hs_ident_edge_conn_t::identity_pk
ed25519_public_key_t identity_pk
Definition: hs_ident.h:106
find_and_remove_client_auth_creds_file
static void find_and_remove_client_auth_creds_file(const hs_client_service_authorization_t *cred)
Definition: hs_client.c:1762
dir_connection_t
Definition: dir_connection_st.h:21
router_have_minimum_dir_info
int router_have_minimum_dir_info(void)
Definition: nodelist.c:2427
hs_client_reextend_intro_circuit
int hs_client_reextend_intro_circuit(origin_circuit_t *circ)
Definition: hs_client.c:2475
hs_circuit.h
Header file containing circuit data for the whole HS subsystem.
entry_connection_t
Definition: entry_connection_st.h:19
CURVE25519_SECKEY_LEN
#define CURVE25519_SECKEY_LEN
Definition: x25519_sizes.h:22
DIRIND_ANONYMOUS
@ DIRIND_ANONYMOUS
Definition: dirclient.h:39
directory_request_t
struct directory_request_t directory_request_t
Definition: dirclient.h:52
hs_get_subcredential
void hs_get_subcredential(const ed25519_public_key_t *identity_pk, const ed25519_public_key_t *blinded_pk, hs_subcredential_t *subcred_out)
Definition: hs_common.c:565
origin_circuit_st.h
Origin circuit structure.
connection_t::timestamp_last_read_allowed
time_t timestamp_last_read_allowed
Definition: connection_st.h:104
CONN_IS_EDGE
#define CONN_IS_EDGE(x)
Definition: connection_st.h:183
hs_desc_intro_point_t
Definition: hs_descriptor.h:99
HS_CLIENT_FETCH_PENDING
@ HS_CLIENT_FETCH_PENDING
Definition: hs_client.h:33
hs_descriptor.h
Header file for hs_descriptor.c.
smartlist_t
Definition: smartlist_core.h:26
HS_SERVICE_ADDR_LEN_BASE32
#define HS_SERVICE_ADDR_LEN_BASE32
Definition: hs_common.h:80
hs_ident_circuit_t::intro_enc_pk
curve25519_public_key_t intro_enc_pk
Definition: hs_ident.h:55
directory_request_set_indirection
void directory_request_set_indirection(directory_request_t *req, dir_indirection_t indirection)
Definition: dirclient.c:1002
CIRCUIT_PURPOSE_C_INTRODUCING
#define CIRCUIT_PURPOSE_C_INTRODUCING
Definition: circuitlist.h:73
EDGE_TO_ENTRY_CONN
entry_connection_t * EDGE_TO_ENTRY_CONN(edge_connection_t *c)
Definition: connection_edge.c:225
hs_ident_circuit_t::rendezvous_client_kp
curve25519_keypair_t rendezvous_client_kp
Definition: hs_ident.h:72
check_private_dir
int check_private_dir(const char *dirname, cpd_check_t check, const char *effective_user)
Definition: dir.c:71
extend_info_t
Definition: extend_info_st.h:27
tor_listdir
smartlist_t * tor_listdir(const char *dirname)
Definition: dir.c:307
directory_launch_v3_desc_fetch
static hs_client_fetch_status_t directory_launch_v3_desc_fetch(const ed25519_public_key_t *onion_identity_pk, const routerstatus_t *hsdir)
Definition: hs_client.c:368
hs_client_remove_auth_credentials
hs_client_removal_auth_status_t hs_client_remove_auth_credentials(const char *hsaddress)
Definition: hs_client.c:1812
or.h
Master header file for Tor-specific functionality.
LD_PROTOCOL
#define LD_PROTOCOL
Definition: log.h:72
handle_introduce_ack
static int handle_introduce_ack(origin_circuit_t *circ, const uint8_t *payload, size_t payload_len)
Definition: hs_client.c:1180
hs_client_service_authorization_t::onion_address
char onion_address[HS_SERVICE_ADDR_LEN_BASE32+1]
Definition: hs_client.h:72
auth_key_filename_is_valid
STATIC int auth_key_filename_is_valid(const char *filename)
Definition: hs_client.c:2172