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Merge branch 'maint-0.3.0'

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This commit is contained in:
Nick Mathewson 2017-06-08 09:17:32 -04:00
commit 9acca04025
2 changed files with 22 additions and 7 deletions
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8
changes/trove-2017-004 Normal file
View File

@ -0,0 +1,8 @@
o Major bugfixes (hidden service, relay, security):
- Fix an assertion failure when an hidden service handles a
malformed BEGIN cell. This bug resulted in the service crashing
triggered by a tor_assert(). Fixes bug 22493, tracked as
TROVE-2017-004 and as CVE-2017-0375; bugfix on tor-0.3.0.1-alpha.
Found by armadev.

21
src/or/connection_edge.c
View File

@ -3092,14 +3092,21 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
char *address = NULL;
uint16_t port = 0;
or_circuit_t *or_circ = NULL;
origin_circuit_t *origin_circ = NULL;
crypt_path_t *layer_hint = NULL;
const or_options_t *options = get_options();
begin_cell_t bcell;
int rv;
uint8_t end_reason=0;
assert_circuit_ok(circ);
if (!CIRCUIT_IS_ORIGIN(circ))
if (!CIRCUIT_IS_ORIGIN(circ)) {
or_circ = TO_OR_CIRCUIT(circ);
} else {
tor_assert(circ->purpose == CIRCUIT_PURPOSE_S_REND_JOINED);
origin_circ = TO_ORIGIN_CIRCUIT(circ);
layer_hint = origin_circ->cpath->prev;
}
relay_header_unpack(&rh, cell->payload);
if (rh.length > RELAY_PAYLOAD_SIZE)
@ -3124,7 +3131,7 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
return -END_CIRC_REASON_TORPROTOCOL;
} else if (rv == -1) {
tor_free(bcell.address);
relay_send_end_cell_from_edge(rh.stream_id, circ, end_reason, NULL);
relay_send_end_cell_from_edge(rh.stream_id, circ, end_reason, layer_hint);
return 0;
}
@ -3159,7 +3166,7 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
if (!directory_permits_begindir_requests(options) ||
circ->purpose != CIRCUIT_PURPOSE_OR) {
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_NOTDIRECTORY, NULL);
END_STREAM_REASON_NOTDIRECTORY, layer_hint);
return 0;
}
/* Make sure to get the 'real' address of the previous hop: the
@ -3176,7 +3183,7 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
} else {
log_warn(LD_BUG, "Got an unexpected command %d", (int)rh.command);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_INTERNAL, NULL);
END_STREAM_REASON_INTERNAL, layer_hint);
return 0;
}
@ -3187,7 +3194,7 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
if (bcell.flags & BEGIN_FLAG_IPV4_NOT_OK) {
tor_free(address);
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_EXITPOLICY, NULL);
END_STREAM_REASON_EXITPOLICY, layer_hint);
return 0;
}
}
@ -3210,7 +3217,7 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
n_stream->deliver_window = STREAMWINDOW_START;
if (circ->purpose == CIRCUIT_PURPOSE_S_REND_JOINED) {
origin_circuit_t *origin_circ = TO_ORIGIN_CIRCUIT(circ);
tor_assert(origin_circ);
log_info(LD_REND,"begin is for rendezvous. configuring stream.");
n_stream->base_.address = tor_strdup("(rendezvous)");
n_stream->base_.state = EXIT_CONN_STATE_CONNECTING;
@ -3230,7 +3237,7 @@ connection_exit_begin_conn(cell_t *cell, circuit_t *circ)
* the hidden service. */
relay_send_end_cell_from_edge(rh.stream_id, circ,
END_STREAM_REASON_DONE,
origin_circ->cpath->prev);
layer_hint);
connection_free(TO_CONN(n_stream));
tor_free(address);