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[tor/maint-0.2.2] Fix a failure case of connection_ap_handshake_attach_circuit()
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 8a36f2125137dc31a0771a8eeac0f2bb8c1343d0 Author: Sebastian Hahn <sebastian(a)torproject.org> Date: Thu Apr 28 01:48:25 2011 +0200 Fix a failure case of connection_ap_handshake_attach_circuit() tor_fragile_assert() might be a no-op, so we have to return something here to indicate failure to the caller. --- src/or/circuituse.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/src/or/circuituse.c b/src/or/circuituse.c index 247aca7..6a9c397 100644 --- a/src/or/circuituse.c +++ b/src/or/circuituse.c @@ -1573,6 +1573,7 @@ connection_ap_handshake_attach_circuit(edge_connection_t *conn) return -1; default: /* oops */ tor_fragile_assert(); + return -1; } } }

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[tor/maint-0.2.2] Merge branch 'bug3k_021' into bug3k_022
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 4b13ebd5ab4d051803e9cfde8bb965a4bf8ea90d Merge: 0130e7c 8a36f21 Author: Sebastian Hahn <sebastian(a)torproject.org> Date: Thu Apr 28 19:00:34 2011 +0200 Merge branch 'bug3k_021' into bug3k_022 Conflicts: src/or/or.h src/or/rendclient.c changes/forget-rend-descs-on-newnym | 9 ++++ src/or/circuituse.c | 19 ++++++--- src/or/main.c | 2 + src/or/rendclient.c | 81 +++++++++++++++++++++++++++------- src/or/rendclient.h | 1 + src/or/rendcommon.c | 10 ++++ src/or/rendcommon.h | 1 + 7 files changed, 100 insertions(+), 23 deletions(-) diff --cc src/or/rendclient.c index 65e632f,fb95efb..97345bf --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@@ -91,28 -74,67 +91,39 @@@ rend_client_send_introduction(origin_ci if (rend_cache_lookup_entry(introcirc->rend_data->onion_address, -1, &entry) < 1) { - log_warn(LD_REND, - "query %s didn't have valid rend desc in cache. Failing.", - escaped_safe_str_client(introcirc->rend_data->onion_address)); - goto err; + log_info(LD_REND, + "query %s didn't have valid rend desc in cache. " + "Refetching descriptor.", + safe_str(introcirc->rend_data->onion_address)); - /* Fetch both v0 and v2 rend descriptors in parallel. Use whichever - * arrives first. Exception: When using client authorization, only - * fetch v2 descriptors.*/ + rend_client_refetch_v2_renddesc(introcirc->rend_data); - if (introcirc->rend_data->auth_type == REND_NO_AUTH) - rend_client_refetch_renddesc(introcirc->rend_data->onion_address); + { + connection_t *conn; + + while ((conn = connection_get_by_type_state_rendquery(CONN_TYPE_AP, + AP_CONN_STATE_CIRCUIT_WAIT, - introcirc->rend_data->onion_address, -1))) { ++ introcirc->rend_data->onion_address))) { + conn->state = AP_CONN_STATE_RENDDESC_WAIT; + } + } + + return -1; } - /* first 20 bytes of payload are the hash of the intro key */ + /* first 20 bytes of payload are the hash of Bob's pk */ - if (entry->parsed->version == 0) { /* un-versioned descriptor */ - intro_key = entry->parsed->pk; - } else { /* versioned descriptor */ - intro_key = NULL; - SMARTLIST_FOREACH(entry->parsed->intro_nodes, rend_intro_point_t *, - intro, { - if (!memcmp(introcirc->build_state->chosen_exit->identity_digest, - intro->extend_info->identity_digest, DIGEST_LEN)) { - intro_key = intro->intro_key; - break; - } - }); - if (!intro_key) { - /** XXX This case probably means that the intro point vanished while - * we were building a circuit to it. In the future, we should find - * out how that happened and whether we should kill the circuits to - * removed intro points immediately. See task 1073. */ - int num_intro_points = smartlist_len(entry->parsed->intro_nodes); - if (rend_cache_lookup_entry(introcirc->rend_data->onion_address, - 0, &entry) > 0) { - log_info(LD_REND, "We have both a v0 and a v2 rend desc for this " - "service. The v2 desc doesn't contain the introduction " - "point (and key) to send an INTRODUCE1/2 cell to this " - "introduction point. Assuming the introduction point " - "is for v0 rend clients and using the service key " - "from the v0 desc instead. (This is probably a bug, " - "because we shouldn't even have both a v0 and a v2 " - "descriptor for the same service.)"); - /* See flyspray task 1024. */ - intro_key = entry->parsed->pk; - } else { - log_info(LD_REND, "Internal error: could not find intro key; we " - "only have a v2 rend desc with %d intro points.", - num_intro_points); - goto perm_err; - } + intro_key = NULL; + SMARTLIST_FOREACH(entry->parsed->intro_nodes, rend_intro_point_t *, + intro, { + if (!memcmp(introcirc->build_state->chosen_exit->identity_digest, + intro->extend_info->identity_digest, DIGEST_LEN)) { + intro_key = intro->intro_key; + break; } + }); + if (!intro_key) { - log_info(LD_REND, "Our introduction point knowledge changed in " - "mid-connect! Could not find intro key; we only have a " - "v2 rend desc with %d intro points. Giving up.", ++ log_info(LD_REND, "Internal error: could not find intro key; we " ++ "only have a v2 rend desc with %d intro points.", + smartlist_len(entry->parsed->intro_nodes)); - goto err; ++ goto perm_err; } if (crypto_pk_get_digest(intro_key, payload)<0) { log_warn(LD_BUG, "Internal error: couldn't hash public key."); @@@ -526,8 -574,45 +537,44 @@@ rend_client_refetch_v2_renddesc(const r return; } + /** Cancel all rendezvous descriptor fetches currently in progress. + */ + void + rend_client_cancel_descriptor_fetches(void) + { + smartlist_t *connection_array = get_connection_array(); + + SMARTLIST_FOREACH_BEGIN(connection_array, connection_t *, conn) { + if (conn->type == CONN_TYPE_DIR && + (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC || + conn->purpose == DIR_PURPOSE_FETCH_RENDDESC_V2)) { + /* It's a rendezvous descriptor fetch in progress -- cancel it + * by marking the connection for close. + * + * Even if this connection has already reached EOF, this is + * enough to make sure that if the descriptor hasn't been + * processed yet, it won't be. See the end of + * connection_handle_read; connection_reached_eof (indirectly) + * processes whatever response the connection received. */ + + const rend_data_t *rd = (TO_DIR_CONN(conn))->rend_data; + if (!rd) { + log_warn(LD_BUG | LD_REND, + "Marking for close dir conn fetching rendezvous " + "descriptor for unknown service!"); + } else { - log_debug(LD_REND, "Marking for close dir conn fetching v%d " ++ log_debug(LD_REND, "Marking for close dir conn fetching " + "rendezvous descriptor for service %s", - (int)(rd->rend_desc_version), + safe_str(rd->onion_address)); + } + connection_mark_for_close(conn); + } + } SMARTLIST_FOREACH_END(conn); + } + /** Remove failed_intro from ent. If ent now has no intro points, or * service is unrecognized, then launch a new renddesc fetch. + * * Return -1 if error, 0 if no intro points remain or service * unrecognized, 1 if recognized and some intro points remain. diff --cc src/or/rendclient.h index 3f2e58e,0000000..6910c1a mode 100644,000000..100644 --- a/src/or/rendclient.h +++ b/src/or/rendclient.h @@@ -1,44 -1,0 +1,45 @@@ +/* Copyright (c) 2001 Matej Pfajfar. + * Copyright (c) 2001-2004, Roger Dingledine. + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2011, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file rendclient.h + * \brief Header file for rendclient.c. + **/ + +#ifndef _TOR_RENDCLIENT_H +#define _TOR_RENDCLIENT_H + +void rend_client_introcirc_has_opened(origin_circuit_t *circ); +void rend_client_rendcirc_has_opened(origin_circuit_t *circ); +int rend_client_introduction_acked(origin_circuit_t *circ, + const uint8_t *request, + size_t request_len); +void rend_client_refetch_v2_renddesc(const rend_data_t *rend_query); ++void rend_client_cancel_descriptor_fetches(void); +int rend_client_remove_intro_point(extend_info_t *failed_intro, + const rend_data_t *rend_query); +int rend_client_rendezvous_acked(origin_circuit_t *circ, + const uint8_t *request, + size_t request_len); +int rend_client_receive_rendezvous(origin_circuit_t *circ, + const uint8_t *request, + size_t request_len); +void rend_client_desc_trynow(const char *query); + +extend_info_t *rend_client_get_random_intro(const rend_data_t *rend_query); +int rend_client_any_intro_points_usable(const rend_cache_entry_t *entry); + +int rend_client_send_introduction(origin_circuit_t *introcirc, + origin_circuit_t *rendcirc); +int rend_parse_service_authorization(or_options_t *options, + int validate_only); +rend_service_authorization_t *rend_client_lookup_service_authorization( + const char *onion_address); +void rend_service_authorization_free_all(void); +rend_data_t *rend_data_dup(const rend_data_t *request); + +#endif + diff --cc src/or/rendcommon.h index 5014957,0000000..44b5227 mode 100644,000000..100644 --- a/src/or/rendcommon.h +++ b/src/or/rendcommon.h @@@ -1,65 -1,0 +1,66 @@@ +/* Copyright (c) 2001 Matej Pfajfar. + * Copyright (c) 2001-2004, Roger Dingledine. + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. + * Copyright (c) 2007-2011, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +/** + * \file rendcommon.h + * \brief Header file for rendcommon.c. + **/ + +#ifndef _TOR_RENDCOMMON_H +#define _TOR_RENDCOMMON_H + +/** Free all storage associated with <b>data</b> */ +static INLINE void +rend_data_free(rend_data_t *data) +{ + tor_free(data); +} + +int rend_cmp_service_ids(const char *one, const char *two); + +void rend_process_relay_cell(circuit_t *circ, const crypt_path_t *layer_hint, + int command, size_t length, + const uint8_t *payload); + +void rend_service_descriptor_free(rend_service_descriptor_t *desc); +rend_service_descriptor_t *rend_parse_service_descriptor(const char *str, + size_t len); +int rend_get_service_id(crypto_pk_env_t *pk, char *out); +void rend_encoded_v2_service_descriptor_free( + rend_encoded_v2_service_descriptor_t *desc); +void rend_intro_point_free(rend_intro_point_t *intro); + +void rend_cache_init(void); +void rend_cache_clean(void); +void rend_cache_clean_v2_descs_as_dir(void); ++void rend_cache_purge(void); +void rend_cache_free_all(void); +int rend_valid_service_id(const char *query); +int rend_cache_lookup_desc(const char *query, int version, const char **desc, + size_t *desc_len); +int rend_cache_lookup_entry(const char *query, int version, + rend_cache_entry_t **entry_out); +int rend_cache_lookup_v2_desc_as_dir(const char *query, const char **desc); +int rend_cache_store(const char *desc, size_t desc_len, int published); +int rend_cache_store_v2_desc_as_client(const char *desc, + const rend_data_t *rend_query); +int rend_cache_store_v2_desc_as_dir(const char *desc); +int rend_cache_size(void); +int rend_encode_v2_descriptors(smartlist_t *descs_out, + rend_service_descriptor_t *desc, time_t now, + uint8_t period, rend_auth_type_t auth_type, + crypto_pk_env_t *client_key, + smartlist_t *client_cookies); +int rend_compute_v2_desc_id(char *desc_id_out, const char *service_id, + const char *descriptor_cookie, + time_t now, uint8_t replica); +int rend_id_is_in_interval(const char *a, const char *b, const char *c); +void rend_get_descriptor_id_bytes(char *descriptor_id_out, + const char *service_id, + const char *secret_id_part); + +#endif +

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[tor/maint-0.2.2] Clean up merge of bug3k_021
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 2c0258b69a232a7b11ecc999bee74dac1c1b1495 Author: Robert Ransom <rransom.8774(a)gmail.com> Date: Thu Apr 28 10:37:35 2011 -0700 Clean up merge of bug3k_021 --- src/or/rendclient.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 97345bf..8803875 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -94,7 +94,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, log_info(LD_REND, "query %s didn't have valid rend desc in cache. " "Refetching descriptor.", - safe_str(introcirc->rend_data->onion_address)); + safe_str_client(introcirc->rend_data->onion_address)); rend_client_refetch_v2_renddesc(introcirc->rend_data); { connection_t *conn; @@ -120,8 +120,9 @@ rend_client_send_introduction(origin_circuit_t *introcirc, } }); if (!intro_key) { - log_info(LD_REND, "Internal error: could not find intro key; we " - "only have a v2 rend desc with %d intro points.", + log_info(LD_REND, "Our introduction point knowledge changed in " + "mid-connect! Could not find intro key; we only have a " + "v2 rend desc with %d intro points. Giving up.", smartlist_len(entry->parsed->intro_nodes)); goto perm_err; }

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[tor/maint-0.2.2] Forget all rendezvous client state on SIGNAL NEWNYM
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 440e48ddf27094e48c401c68c9014eca43b6867e Author: Robert Ransom <rransom.8774(a)gmail.com> Date: Wed Apr 20 02:27:58 2011 -0700 Forget all rendezvous client state on SIGNAL NEWNYM --- changes/forget-rend-descs-on-newnym | 5 ++++ src/or/main.c | 2 + src/or/or.h | 2 + src/or/rendclient.c | 37 +++++++++++++++++++++++++++++++++++ src/or/rendcommon.c | 10 +++++++++ 5 files changed, 56 insertions(+), 0 deletions(-) diff --git a/changes/forget-rend-descs-on-newnym b/changes/forget-rend-descs-on-newnym new file mode 100644 index 0000000..c086973 --- /dev/null +++ b/changes/forget-rend-descs-on-newnym @@ -0,0 +1,5 @@ + o Security fixes: + - Forget all hidden service descriptors cached as a client when + processing a SIGNAL NEWNYM command. Fixes bug 3000. Bugfix on + 0.0.6. + diff --git a/src/or/main.c b/src/or/main.c index 96b7b45..e44fd49 100644 --- a/src/or/main.c +++ b/src/or/main.c @@ -785,6 +785,8 @@ signewnym_impl(time_t now) { circuit_expire_all_dirty_circs(); addressmap_clear_transient(); + rend_cache_purge(); + rend_client_cancel_descriptor_fetches(); time_of_last_signewnym = now; signewnym_is_pending = 0; } diff --git a/src/or/or.h b/src/or/or.h index 57e091e..897ad32 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -4039,6 +4039,7 @@ int rend_client_introduction_acked(origin_circuit_t *circ, size_t request_len); void rend_client_refetch_renddesc(const char *query); void rend_client_refetch_v2_renddesc(const rend_data_t *rend_query); +void rend_client_cancel_descriptor_fetches(void); int rend_client_remove_intro_point(extend_info_t *failed_intro, const rend_data_t *rend_query); int rend_client_rendezvous_acked(origin_circuit_t *circ, @@ -4137,6 +4138,7 @@ typedef struct rend_cache_entry_t { void rend_cache_init(void); void rend_cache_clean(void); void rend_cache_clean_v2_descs_as_dir(void); +void rend_cache_purge(void); void rend_cache_free_all(void); int rend_valid_service_id(const char *query); int rend_cache_lookup_desc(const char *query, int version, const char **desc, diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 51306b3..37cca14 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -557,8 +557,45 @@ rend_client_refetch_v2_renddesc(const rend_data_t *rend_query) return; } +/** Cancel all rendezvous descriptor fetches currently in progress. + */ +void +rend_client_cancel_descriptor_fetches(void) +{ + smartlist_t *connection_array = get_connection_array(); + + SMARTLIST_FOREACH_BEGIN(connection_array, connection_t *, conn) { + if (conn->type == CONN_TYPE_DIR && + (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC || + conn->purpose == DIR_PURPOSE_FETCH_RENDDESC_V2)) { + /* It's a rendezvous descriptor fetch in progress -- cancel it + * by marking the connection for close. + * + * Even if this connection has already reached EOF, this is + * enough to make sure that if the descriptor hasn't been + * processed yet, it won't be. See the end of + * connection_handle_read; connection_reached_eof (indirectly) + * processes whatever response the connection received. */ + + const rend_data_t *rd = (TO_DIR_CONN(conn))->rend_data; + if (!rd) { + log_warn(LD_BUG | LD_REND, + "Marking for close dir conn fetching rendezvous " + "descriptor for unknown service!"); + } else { + log_debug(LD_REND, "Marking for close dir conn fetching v%d " + "rendezvous descriptor for service %s", + (int)(rd->rend_desc_version), + safe_str(rd->onion_address)); + } + connection_mark_for_close(conn); + } + } SMARTLIST_FOREACH_END(conn); +} + /** Remove failed_intro from ent. If ent now has no intro points, or * service is unrecognized, then launch a new renddesc fetch. + * * Return -1 if error, 0 if no intro points remain or service * unrecognized, 1 if recognized and some intro points remain. diff --git a/src/or/rendcommon.c b/src/or/rendcommon.c index d6f5443..ba28cca 100644 --- a/src/or/rendcommon.c +++ b/src/or/rendcommon.c @@ -871,6 +871,16 @@ rend_cache_clean(void) } } +/** Remove ALL entries from the rendezvous service descriptor cache. + */ +void +rend_cache_purge(void) +{ + if (rend_cache) + strmap_free(rend_cache, _rend_cache_entry_free); + rend_cache = strmap_new(); +} + /** Remove all old v2 descriptors and those for which this hidden service * directory is not responsible for any more. */ void

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[tor/maint-0.2.2] Allow rend_client_send_introduction to fail transiently
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 2ad18ae7366ce4979b44fa53d0105940005489c0 Author: Robert Ransom <rransom.8774(a)gmail.com> Date: Mon Apr 25 08:36:02 2011 -0700 Allow rend_client_send_introduction to fail transiently i.e. without closing the AP connection. --- changes/forget-rend-descs-on-newnym | 4 ++++ src/or/circuituse.c | 18 ++++++++++++------ src/or/rendclient.c | 20 ++++++++++---------- 3 files changed, 26 insertions(+), 16 deletions(-) diff --git a/changes/forget-rend-descs-on-newnym b/changes/forget-rend-descs-on-newnym index c086973..ab2fd61 100644 --- a/changes/forget-rend-descs-on-newnym +++ b/changes/forget-rend-descs-on-newnym @@ -2,4 +2,8 @@ - Forget all hidden service descriptors cached as a client when processing a SIGNAL NEWNYM command. Fixes bug 3000. Bugfix on 0.0.6. + o Code simplifications and refactoring: + - Allow rend_client_send_introduction to fail without closing the + AP connection permanently. + diff --git a/src/or/circuituse.c b/src/or/circuituse.c index 996c99c..247aca7 100644 --- a/src/or/circuituse.c +++ b/src/or/circuituse.c @@ -1560,14 +1560,20 @@ connection_ap_handshake_attach_circuit(edge_connection_t *conn) "introduction. (stream %d sec old)", introcirc->_base.n_circ_id, rendcirc->_base.n_circ_id, conn_age); - if (rend_client_send_introduction(introcirc, rendcirc) < 0) { + switch (rend_client_send_introduction(introcirc, rendcirc)) { + case 0: /* success */ + rendcirc->_base.timestamp_dirty = time(NULL); + introcirc->_base.timestamp_dirty = time(NULL); + assert_circuit_ok(TO_CIRCUIT(rendcirc)); + assert_circuit_ok(TO_CIRCUIT(introcirc)); + return 0; + case -1: /* transient error */ + return 0; + case -2: /* permanent error */ return -1; + default: /* oops */ + tor_fragile_assert(); } - rendcirc->_base.timestamp_dirty = time(NULL); - introcirc->_base.timestamp_dirty = time(NULL); - assert_circuit_ok(TO_CIRCUIT(rendcirc)); - assert_circuit_ok(TO_CIRCUIT(introcirc)); - return 0; } } diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 37cca14..ca846d9 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -77,7 +77,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, log_warn(LD_REND, "query %s didn't have valid rend desc in cache. Failing.", escaped_safe_str(introcirc->rend_data->onion_address)); - goto err; + goto perm_err; } /* first 20 bytes of payload are the hash of Bob's pk */ @@ -115,13 +115,13 @@ rend_client_send_introduction(origin_circuit_t *introcirc, log_info(LD_REND, "Internal error: could not find intro key; we " "only have a v2 rend desc with %d intro points.", num_intro_points); - goto err; + goto perm_err; } } } if (crypto_pk_get_digest(intro_key, payload)<0) { log_warn(LD_BUG, "Internal error: couldn't hash public key."); - goto err; + goto perm_err; } /* Initialize the pending_final_cpath and start the DH handshake. */ @@ -132,11 +132,11 @@ rend_client_send_introduction(origin_circuit_t *introcirc, cpath->magic = CRYPT_PATH_MAGIC; if (!(cpath->dh_handshake_state = crypto_dh_new(DH_TYPE_REND))) { log_warn(LD_BUG, "Internal error: couldn't allocate DH."); - goto err; + goto perm_err; } if (crypto_dh_generate_public(cpath->dh_handshake_state)<0) { log_warn(LD_BUG, "Internal error: couldn't generate g^x."); - goto err; + goto perm_err; } } @@ -186,7 +186,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, if (crypto_dh_get_public(cpath->dh_handshake_state, tmp+dh_offset, DH_KEY_LEN)<0) { log_warn(LD_BUG, "Internal error: couldn't extract g^x."); - goto err; + goto perm_err; } note_crypto_pk_op(REND_CLIENT); @@ -199,7 +199,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, PK_PKCS1_OAEP_PADDING, 0); if (r<0) { log_warn(LD_BUG,"Internal error: hybrid pk encrypt failed."); - goto err; + goto perm_err; } payload_len = DIGEST_LEN + r; @@ -212,17 +212,17 @@ rend_client_send_introduction(origin_circuit_t *introcirc, introcirc->cpath->prev)<0) { /* introcirc is already marked for close. leave rendcirc alone. */ log_warn(LD_BUG, "Couldn't send INTRODUCE1 cell"); - return -1; + return -2; } /* Now, we wait for an ACK or NAK on this circuit. */ introcirc->_base.purpose = CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT; return 0; -err: +perm_err: circuit_mark_for_close(TO_CIRCUIT(introcirc), END_CIRC_REASON_INTERNAL); circuit_mark_for_close(TO_CIRCUIT(rendcirc), END_CIRC_REASON_INTERNAL); - return -1; + return -2; } /** Called when a rendezvous circuit is open; sends a establish

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[tor/maint-0.2.1] Fix a failure case of connection_ap_handshake_attach_circuit()
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 8a36f2125137dc31a0771a8eeac0f2bb8c1343d0 Author: Sebastian Hahn <sebastian(a)torproject.org> Date: Thu Apr 28 01:48:25 2011 +0200 Fix a failure case of connection_ap_handshake_attach_circuit() tor_fragile_assert() might be a no-op, so we have to return something here to indicate failure to the caller. --- src/or/circuituse.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/src/or/circuituse.c b/src/or/circuituse.c index 247aca7..6a9c397 100644 --- a/src/or/circuituse.c +++ b/src/or/circuituse.c @@ -1573,6 +1573,7 @@ connection_ap_handshake_attach_circuit(edge_connection_t *conn) return -1; default: /* oops */ tor_fragile_assert(); + return -1; } } }

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[tor/maint-0.2.1] Fix a bug introduced by purging rend_cache on NEWNYM
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit f1cf9bd74d225e90ca123eb664c1c5538eedaa03 Author: Robert Ransom <rransom.8774(a)gmail.com> Date: Mon Apr 25 06:38:35 2011 -0700 Fix a bug introduced by purging rend_cache on NEWNYM If the user sent a SIGNAL NEWNYM command after we fetched a rendezvous descriptor, while we were building the introduction-point circuit, we would give up entirely on trying to connect to the hidden service. Original patch by rransom slightly edited to go into 0.2.1 --- src/or/rendclient.c | 25 +++++++++++++++++++++---- 1 files changed, 21 insertions(+), 4 deletions(-) diff --git a/src/or/rendclient.c b/src/or/rendclient.c index ca846d9..fb95efb 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -74,10 +74,27 @@ rend_client_send_introduction(origin_circuit_t *introcirc, if (rend_cache_lookup_entry(introcirc->rend_data->onion_address, -1, &entry) < 1) { - log_warn(LD_REND, - "query %s didn't have valid rend desc in cache. Failing.", - escaped_safe_str(introcirc->rend_data->onion_address)); - goto perm_err; + log_info(LD_REND, + "query %s didn't have valid rend desc in cache. " + "Refetching descriptor.", + safe_str(introcirc->rend_data->onion_address)); + /* Fetch both v0 and v2 rend descriptors in parallel. Use whichever + * arrives first. Exception: When using client authorization, only + * fetch v2 descriptors.*/ + rend_client_refetch_v2_renddesc(introcirc->rend_data); + if (introcirc->rend_data->auth_type == REND_NO_AUTH) + rend_client_refetch_renddesc(introcirc->rend_data->onion_address); + { + connection_t *conn; + + while ((conn = connection_get_by_type_state_rendquery(CONN_TYPE_AP, + AP_CONN_STATE_CIRCUIT_WAIT, + introcirc->rend_data->onion_address, -1))) { + conn->state = AP_CONN_STATE_RENDDESC_WAIT; + } + } + + return -1; } /* first 20 bytes of payload are the hash of Bob's pk */

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[tor/maint-0.2.1] Forget all rendezvous client state on SIGNAL NEWNYM
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 440e48ddf27094e48c401c68c9014eca43b6867e Author: Robert Ransom <rransom.8774(a)gmail.com> Date: Wed Apr 20 02:27:58 2011 -0700 Forget all rendezvous client state on SIGNAL NEWNYM --- changes/forget-rend-descs-on-newnym | 5 ++++ src/or/main.c | 2 + src/or/or.h | 2 + src/or/rendclient.c | 37 +++++++++++++++++++++++++++++++++++ src/or/rendcommon.c | 10 +++++++++ 5 files changed, 56 insertions(+), 0 deletions(-) diff --git a/changes/forget-rend-descs-on-newnym b/changes/forget-rend-descs-on-newnym new file mode 100644 index 0000000..c086973 --- /dev/null +++ b/changes/forget-rend-descs-on-newnym @@ -0,0 +1,5 @@ + o Security fixes: + - Forget all hidden service descriptors cached as a client when + processing a SIGNAL NEWNYM command. Fixes bug 3000. Bugfix on + 0.0.6. + diff --git a/src/or/main.c b/src/or/main.c index 96b7b45..e44fd49 100644 --- a/src/or/main.c +++ b/src/or/main.c @@ -785,6 +785,8 @@ signewnym_impl(time_t now) { circuit_expire_all_dirty_circs(); addressmap_clear_transient(); + rend_cache_purge(); + rend_client_cancel_descriptor_fetches(); time_of_last_signewnym = now; signewnym_is_pending = 0; } diff --git a/src/or/or.h b/src/or/or.h index 57e091e..897ad32 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -4039,6 +4039,7 @@ int rend_client_introduction_acked(origin_circuit_t *circ, size_t request_len); void rend_client_refetch_renddesc(const char *query); void rend_client_refetch_v2_renddesc(const rend_data_t *rend_query); +void rend_client_cancel_descriptor_fetches(void); int rend_client_remove_intro_point(extend_info_t *failed_intro, const rend_data_t *rend_query); int rend_client_rendezvous_acked(origin_circuit_t *circ, @@ -4137,6 +4138,7 @@ typedef struct rend_cache_entry_t { void rend_cache_init(void); void rend_cache_clean(void); void rend_cache_clean_v2_descs_as_dir(void); +void rend_cache_purge(void); void rend_cache_free_all(void); int rend_valid_service_id(const char *query); int rend_cache_lookup_desc(const char *query, int version, const char **desc, diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 51306b3..37cca14 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -557,8 +557,45 @@ rend_client_refetch_v2_renddesc(const rend_data_t *rend_query) return; } +/** Cancel all rendezvous descriptor fetches currently in progress. + */ +void +rend_client_cancel_descriptor_fetches(void) +{ + smartlist_t *connection_array = get_connection_array(); + + SMARTLIST_FOREACH_BEGIN(connection_array, connection_t *, conn) { + if (conn->type == CONN_TYPE_DIR && + (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC || + conn->purpose == DIR_PURPOSE_FETCH_RENDDESC_V2)) { + /* It's a rendezvous descriptor fetch in progress -- cancel it + * by marking the connection for close. + * + * Even if this connection has already reached EOF, this is + * enough to make sure that if the descriptor hasn't been + * processed yet, it won't be. See the end of + * connection_handle_read; connection_reached_eof (indirectly) + * processes whatever response the connection received. */ + + const rend_data_t *rd = (TO_DIR_CONN(conn))->rend_data; + if (!rd) { + log_warn(LD_BUG | LD_REND, + "Marking for close dir conn fetching rendezvous " + "descriptor for unknown service!"); + } else { + log_debug(LD_REND, "Marking for close dir conn fetching v%d " + "rendezvous descriptor for service %s", + (int)(rd->rend_desc_version), + safe_str(rd->onion_address)); + } + connection_mark_for_close(conn); + } + } SMARTLIST_FOREACH_END(conn); +} + /** Remove failed_intro from ent. If ent now has no intro points, or * service is unrecognized, then launch a new renddesc fetch. + * * Return -1 if error, 0 if no intro points remain or service * unrecognized, 1 if recognized and some intro points remain. diff --git a/src/or/rendcommon.c b/src/or/rendcommon.c index d6f5443..ba28cca 100644 --- a/src/or/rendcommon.c +++ b/src/or/rendcommon.c @@ -871,6 +871,16 @@ rend_cache_clean(void) } } +/** Remove ALL entries from the rendezvous service descriptor cache. + */ +void +rend_cache_purge(void) +{ + if (rend_cache) + strmap_free(rend_cache, _rend_cache_entry_free); + rend_cache = strmap_new(); +} + /** Remove all old v2 descriptors and those for which this hidden service * directory is not responsible for any more. */ void

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[tor/maint-0.2.1] Allow rend_client_send_introduction to fail transiently
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 2ad18ae7366ce4979b44fa53d0105940005489c0 Author: Robert Ransom <rransom.8774(a)gmail.com> Date: Mon Apr 25 08:36:02 2011 -0700 Allow rend_client_send_introduction to fail transiently i.e. without closing the AP connection. --- changes/forget-rend-descs-on-newnym | 4 ++++ src/or/circuituse.c | 18 ++++++++++++------ src/or/rendclient.c | 20 ++++++++++---------- 3 files changed, 26 insertions(+), 16 deletions(-) diff --git a/changes/forget-rend-descs-on-newnym b/changes/forget-rend-descs-on-newnym index c086973..ab2fd61 100644 --- a/changes/forget-rend-descs-on-newnym +++ b/changes/forget-rend-descs-on-newnym @@ -2,4 +2,8 @@ - Forget all hidden service descriptors cached as a client when processing a SIGNAL NEWNYM command. Fixes bug 3000. Bugfix on 0.0.6. + o Code simplifications and refactoring: + - Allow rend_client_send_introduction to fail without closing the + AP connection permanently. + diff --git a/src/or/circuituse.c b/src/or/circuituse.c index 996c99c..247aca7 100644 --- a/src/or/circuituse.c +++ b/src/or/circuituse.c @@ -1560,14 +1560,20 @@ connection_ap_handshake_attach_circuit(edge_connection_t *conn) "introduction. (stream %d sec old)", introcirc->_base.n_circ_id, rendcirc->_base.n_circ_id, conn_age); - if (rend_client_send_introduction(introcirc, rendcirc) < 0) { + switch (rend_client_send_introduction(introcirc, rendcirc)) { + case 0: /* success */ + rendcirc->_base.timestamp_dirty = time(NULL); + introcirc->_base.timestamp_dirty = time(NULL); + assert_circuit_ok(TO_CIRCUIT(rendcirc)); + assert_circuit_ok(TO_CIRCUIT(introcirc)); + return 0; + case -1: /* transient error */ + return 0; + case -2: /* permanent error */ return -1; + default: /* oops */ + tor_fragile_assert(); } - rendcirc->_base.timestamp_dirty = time(NULL); - introcirc->_base.timestamp_dirty = time(NULL); - assert_circuit_ok(TO_CIRCUIT(rendcirc)); - assert_circuit_ok(TO_CIRCUIT(introcirc)); - return 0; } } diff --git a/src/or/rendclient.c b/src/or/rendclient.c index 37cca14..ca846d9 100644 --- a/src/or/rendclient.c +++ b/src/or/rendclient.c @@ -77,7 +77,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, log_warn(LD_REND, "query %s didn't have valid rend desc in cache. Failing.", escaped_safe_str(introcirc->rend_data->onion_address)); - goto err; + goto perm_err; } /* first 20 bytes of payload are the hash of Bob's pk */ @@ -115,13 +115,13 @@ rend_client_send_introduction(origin_circuit_t *introcirc, log_info(LD_REND, "Internal error: could not find intro key; we " "only have a v2 rend desc with %d intro points.", num_intro_points); - goto err; + goto perm_err; } } } if (crypto_pk_get_digest(intro_key, payload)<0) { log_warn(LD_BUG, "Internal error: couldn't hash public key."); - goto err; + goto perm_err; } /* Initialize the pending_final_cpath and start the DH handshake. */ @@ -132,11 +132,11 @@ rend_client_send_introduction(origin_circuit_t *introcirc, cpath->magic = CRYPT_PATH_MAGIC; if (!(cpath->dh_handshake_state = crypto_dh_new(DH_TYPE_REND))) { log_warn(LD_BUG, "Internal error: couldn't allocate DH."); - goto err; + goto perm_err; } if (crypto_dh_generate_public(cpath->dh_handshake_state)<0) { log_warn(LD_BUG, "Internal error: couldn't generate g^x."); - goto err; + goto perm_err; } } @@ -186,7 +186,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, if (crypto_dh_get_public(cpath->dh_handshake_state, tmp+dh_offset, DH_KEY_LEN)<0) { log_warn(LD_BUG, "Internal error: couldn't extract g^x."); - goto err; + goto perm_err; } note_crypto_pk_op(REND_CLIENT); @@ -199,7 +199,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc, PK_PKCS1_OAEP_PADDING, 0); if (r<0) { log_warn(LD_BUG,"Internal error: hybrid pk encrypt failed."); - goto err; + goto perm_err; } payload_len = DIGEST_LEN + r; @@ -212,17 +212,17 @@ rend_client_send_introduction(origin_circuit_t *introcirc, introcirc->cpath->prev)<0) { /* introcirc is already marked for close. leave rendcirc alone. */ log_warn(LD_BUG, "Couldn't send INTRODUCE1 cell"); - return -1; + return -2; } /* Now, we wait for an ACK or NAK on this circuit. */ introcirc->_base.purpose = CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT; return 0; -err: +perm_err: circuit_mark_for_close(TO_CIRCUIT(introcirc), END_CIRC_REASON_INTERNAL); circuit_mark_for_close(TO_CIRCUIT(rendcirc), END_CIRC_REASON_INTERNAL); - return -1; + return -2; } /** Called when a rendezvous circuit is open; sends a establish

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[obfsproxy/master] Howto instructions for using Tor with obfsproxy.
by nickm＠torproject.org 28 Apr '11

28 Apr '11

commit 7123e54eb9bdbae3fe92d2284105a2fd1e2c5a0f Author: George Kadianakis <desnacked(a)gmail.com> Date: Thu Apr 28 09:56:09 2011 -0400 Howto instructions for using Tor with obfsproxy. --- doc/tor-obfs-howto.txt | 101 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 101 insertions(+), 0 deletions(-) diff --git a/doc/tor-obfs-howto.txt b/doc/tor-obfs-howto.txt new file mode 100644 index 0000000..36ad7a3 --- /dev/null +++ b/doc/tor-obfs-howto.txt @@ -0,0 +1,101 @@ +How to set up Tor with Obfsproxy +================================ + + Preliminaries: + +This isn't the final interface--we should make it much easier. + +This is experimental code--if it breaks, you get to keep both smouldering +pieces. + + + + Ingredients: + +Client side needs: + +* a copy of obfsproxy: + git clone git://git.torproject.org/obfsproxy.git + Building it should be easy, just do "./configure && make". + +* a copy of Tor that supports the Socks5Proxy option. + The git version should do the trick. + +Bridge side needs: + +* a copy of obfsproxy: + git clone git://git.torproject.org/obfsproxy.git + Building it should be easy, just do "./configure && make". + +* a copy of Tor with BridgeRelay capabilities. + Quite easy to find nowadays. + + Port setup: + +Our port setup will be like this: + + 1050 1051 + +-----------+ +------------+ + ----| Proxy |-------------| Server |---- + | +-----------+ +------------+ | + | | ++------------+ +--------------+ +| Tor Client | | Tor Bridge | ++------------+ +--------------+ + 5000 5001 + + + + Setting up obfsproxies: + +This command will setup an obfsproxy socks client listening to the +obfs2 protocol on localhost:1050: +./obfsproxy socks obfs2 127.0.0.1:1050 + +This command will setup an obfsproxy server listening to the +obfs2 protocol on localhost:5001: +./obfsproxy server obfs2 127.0.0.1:1051 127.0.0.1:5001 + + Setting up Tor: + +Let's create .torrc_client and .torrc_bridge. +Warning: I'm only posting the relevant torrc options. + +torrc_client: +--- +SocksPort 5000 +UseBridges 1 +Bridge <bridge host>:1051 # This points to the bridge's obfsproxy server. + # You can change <bridge host> to 127.0.0.1 + # for local testing setup. +Socks5Proxy 127.0.0.1:1050 # This points to our obfsproxy client. +--- + +torrc_bridge: +--- +ORPort 5001 # Port where bridge will be listening on. +BridgeRelay 1 +ExitPolicy reject *:* +--- + + Bootstrap sequence: + +Since we are still in PoC state you have to bootstrap the Tors and the +obfsproxies with the correct sequence: + +1. Fire up server obfsproxy. +2. Fire up tor with torrc_bridge. +3. Fire up client obfsproxy. +4. Fire up tor with torrc_client. + + The End + +Now open Firefox on the client side and set it up to use a Socks +server on 127.0.0.1:5000. +Stuff should work now. + +If you were smart enough to open wireshark and sniff the traffic +before doing all the above, you would notice that the TLS handshake +was not carried out plaintext, effectively obfuscating your Tor +experience. Yes. +

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