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Fix bug 1930

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This commit is contained in:
Robert Ransom 2011-04-26 02:21:25 -07:00 committed by Nick Mathewson
parent ddd1b7be2d
commit b8708b5bd3
2 changed files with 70 additions and 40 deletions
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7
changes/forget-rend-descs-on-newnym
View File

@ -2,6 +2,13 @@
- Forget all hidden service descriptors cached as a client when
processing a SIGNAL NEWNYM command. Fixes bug 3000. Bugfix on
0.0.6.
o Major bugfixes:
- When we find that we have extended a hidden service's introduction
circuit to a relay which isn't listed as an introduction point in
the HS descriptor we currently have for the service, we now retry
one of the introduction points in the current HS descriptor.
Previously we would just give up. Bugfix on 0.2.0.10-alpha; fixes
bugs 1024 and 1930.
o Minor bugfixes:
- Don't allow v0 hidden service authorities to act as clients.
Required by fix for bug 3000.

103
src/or/rendclient.c
View File

@ -66,6 +66,50 @@ rend_client_send_establish_rendezvous(origin_circuit_t *circ)
return 0;
}
/** Extend the introduction circuit <b>circ</b> to another valid
* introduction point for the hidden service it is trying to connect
* to, or mark it and launch a new circuit if we can't extend it.
* Return 0 on success. Return -1 and mark the introduction
* circuit on failure.
*
* On failure, the caller is responsible for marking the associated
* rendezvous circuit for close. */
static int
rend_client_reextend_intro_circuit(origin_circuit_t *circ)
{
extend_info_t *extend_info;
int result;
extend_info = rend_client_get_random_intro(circ->rend_data);
if (!extend_info) {
log_warn(LD_REND,
"No usable introduction points left for %s. Closing.",
safe_str_client(circ->rend_data->onion_address));
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
return -1;
}
if (circ->remaining_relay_early_cells) {
log_info(LD_REND,
"Re-extending circ %d, this time to %s.",
circ->_base.n_circ_id, extend_info->nickname);
result = circuit_extend_to_new_exit(circ, extend_info);
} else {
log_info(LD_REND,
"Building a new introduction circuit, this time to %s.",
extend_info->nickname);
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_FINISHED);
if (!circuit_launch_by_extend_info(CIRCUIT_PURPOSE_C_INTRODUCING,
extend_info,
CIRCLAUNCH_IS_INTERNAL)) {
log_warn(LD_REND, "Building introduction circuit failed.");
result = -1;
} else {
result = 0;
}
}
extend_info_free(extend_info);
return result;
}
/** Called when we're trying to connect an ap conn; sends an INTRODUCE1 cell
* down introcirc if possible.
*/
@ -120,11 +164,18 @@ rend_client_send_introduction(origin_circuit_t *introcirc,
}
});
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, "Could not find intro key for %s at %s; we "
"have a v2 rend desc with %d intro points. "
"Trying a different intro point...",
safe_str_client(introcirc->rend_data->onion_address),
introcirc->build_state->chosen_exit->nickname,
smartlist_len(entry->parsed->intro_nodes));
goto perm_err;
if (rend_client_reextend_intro_circuit(introcirc)) {
goto perm_err;
} else {
return -1;
}
}
if (crypto_pk_get_digest(intro_key, payload)<0) {
log_warn(LD_BUG, "Internal error: couldn't hash public key.");
@ -227,7 +278,8 @@ rend_client_send_introduction(origin_circuit_t *introcirc,
return 0;
perm_err:
circuit_mark_for_close(TO_CIRCUIT(introcirc), END_CIRC_REASON_INTERNAL);
if (!introcirc->_base.marked_for_close)
circuit_mark_for_close(TO_CIRCUIT(introcirc), END_CIRC_REASON_INTERNAL);
circuit_mark_for_close(TO_CIRCUIT(rendcirc), END_CIRC_REASON_INTERNAL);
return -2;
}
@ -290,45 +342,16 @@ rend_client_introduction_acked(origin_circuit_t *circ,
* points. If any remain, extend to a new one and try again.
* If none remain, refetch the service descriptor.
*/
log_info(LD_REND, "Got nack for %s from %s...",
safe_str_client(circ->rend_data->onion_address),
circ->build_state->chosen_exit->nickname);
if (rend_client_remove_intro_point(circ->build_state->chosen_exit,
circ->rend_data) > 0) {
/* There are introduction points left. Re-extend the circuit to
* another intro point and try again. */
extend_info_t *extend_info;
int result;
extend_info = rend_client_get_random_intro(circ->rend_data);
if (!extend_info) {
log_warn(LD_REND, "No introduction points left for %s. Closing.",
escaped_safe_str_client(circ->rend_data->onion_address));
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
return -1;
}
if (circ->remaining_relay_early_cells) {
log_info(LD_REND,
"Got nack for %s from %s. Re-extending circ %d, "
"this time to %s.",
escaped_safe_str_client(circ->rend_data->onion_address),
circ->build_state->chosen_exit->nickname,
circ->_base.n_circ_id, extend_info->nickname);
result = circuit_extend_to_new_exit(circ, extend_info);
} else {
log_info(LD_REND,
"Got nack for %s from %s. Building a new introduction "
"circuit, this time to %s.",
escaped_safe_str_client(circ->rend_data->onion_address),
circ->build_state->chosen_exit->nickname,
extend_info->nickname);
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_FINISHED);
if (!circuit_launch_by_extend_info(CIRCUIT_PURPOSE_C_INTRODUCING,
extend_info,
CIRCLAUNCH_IS_INTERNAL)) {
log_warn(LD_REND, "Building introduction circuit failed.");
result = -1;
} else {
result = 0;
}
}
extend_info_free(extend_info);
int result = rend_client_reextend_intro_circuit(circ);
/* XXXX If that call failed, should we close the rend circuit,
* too? */
return result;
}
}