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Merge commit '763fd0ad66' into maint-0.4.0

Browse Source 
tor-github/pr/1174, but with the last commit re-worded to remove
the fixup, because fixups break our push rules.
This commit is contained in:
teor 2019-09-05 11:42:26 +10:00
commit 1203e137be
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GPG Key ID: 10FEAA0E7075672A
2 changed files with 27 additions and 10 deletions
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4
changes/bug30649 Normal file
View File

@ -0,0 +1,4 @@
o Minor bugfixes (circuit padding):
- On relays, properly check that a padding machine is absent before
logging a warn about it being absent. Fixes bug 30649;
bugfix on 0.4.0.1-alpha.

33
src/core/or/circuitpadding.c
View File

@ -160,17 +160,25 @@ circpad_circuit_machineinfo_free_idx(circuit_t *circ, int idx)
}
}
/** Free all the machineinfos in <b>circ</b> that match <b>machine_num</b>. */
static void
/**
* Free all the machineinfos in <b>circ</b> that match <b>machine_num</b>.
*
* Returns true if any machineinfos with that number were freed.
* False otherwise. */
static int
free_circ_machineinfos_with_machine_num(circuit_t *circ, int machine_num)
{
int found = 0;
FOR_EACH_CIRCUIT_MACHINE_BEGIN(i) {
if (circ->padding_machine[i] &&
circ->padding_machine[i]->machine_num == machine_num) {
circpad_circuit_machineinfo_free_idx(circ, i);
circ->padding_machine[i] = NULL;
found = 1;
}
} FOR_EACH_CIRCUIT_MACHINE_END;
return found;
}
/**
@ -2425,22 +2433,27 @@ circpad_handle_padding_negotiate(circuit_t *circ, cell_t *cell)
circpad_negotiate_t *negotiate;
if (CIRCUIT_IS_ORIGIN(circ)) {
log_fn(LOG_WARN, LD_PROTOCOL,
log_fn(LOG_PROTOCOL_WARN, LD_CIRC,
"Padding negotiate cell unsupported at origin.");
return -1;
}
if (circpad_negotiate_parse(&negotiate, cell->payload+RELAY_HEADER_SIZE,
CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE) < 0) {
log_fn(LOG_WARN, LD_CIRC,
log_fn(LOG_PROTOCOL_WARN, LD_CIRC,
"Received malformed PADDING_NEGOTIATE cell; dropping.");
return -1;
}
if (negotiate->command == CIRCPAD_COMMAND_STOP) {
/* Free the machine corresponding to this machine type */
free_circ_machineinfos_with_machine_num(circ, negotiate->machine_type);
log_fn(LOG_WARN, LD_CIRC,
if (free_circ_machineinfos_with_machine_num(circ,
negotiate->machine_type)) {
log_info(LD_CIRC, "Received STOP command for machine %u",
negotiate->machine_type);
goto done;
}
log_fn(LOG_PROTOCOL_WARN, LD_CIRC,
"Received circuit padding stop command for unknown machine.");
goto err;
} else if (negotiate->command == CIRCPAD_COMMAND_START) {
@ -2480,21 +2493,21 @@ circpad_handle_padding_negotiated(circuit_t *circ, cell_t *cell,
circpad_negotiated_t *negotiated;
if (!CIRCUIT_IS_ORIGIN(circ)) {
log_fn(LOG_WARN, LD_PROTOCOL,
log_fn(LOG_PROTOCOL_WARN, LD_CIRC,
"Padding negotiated cell unsupported at non-origin.");
return -1;
}
/* Verify this came from the expected hop */
if (!circpad_padding_is_from_expected_hop(circ, layer_hint)) {
log_fn(LOG_WARN, LD_PROTOCOL,
log_fn(LOG_WARN, LD_CIRC,
"Padding negotiated cell from wrong hop!");
return -1;
}
if (circpad_negotiated_parse(&negotiated, cell->payload+RELAY_HEADER_SIZE,
CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE) < 0) {
log_fn(LOG_WARN, LD_CIRC,
log_fn(LOG_PROTOCOL_WARN, LD_CIRC,
"Received malformed PADDING_NEGOTIATED cell; "
"dropping.");
return -1;
@ -2513,7 +2526,7 @@ circpad_handle_padding_negotiated(circuit_t *circ, cell_t *cell,
// and be sad
free_circ_machineinfos_with_machine_num(circ, negotiated->machine_type);
TO_ORIGIN_CIRCUIT(circ)->padding_negotiation_failed = 1;
log_fn(LOG_INFO, LD_CIRC,
log_fn(LOG_PROTOCOL_WARN, LD_CIRC,
"Middle node did not accept our padding request.");
}