static void
test_channel_for_extend(void *arg)
{
channel_t *chan1 = NULL, *chan2 = NULL;
channel_t *ret_chan = NULL;
char digest[DIGEST_LEN];
ed25519_public_key_t ed_id;
tor_addr_t addr;
const char *msg;
int launch;
time_t now = time(NULL);
(void) arg;
memset(digest, 'A', sizeof(digest));
memset(&ed_id, 'B', sizeof(ed_id));
chan1 = new_fake_channel();
tt_assert(chan1);
/* Need to be registered to get added to the id map. */
channel_register(chan1);
tt_int_op(chan1->registered, OP_EQ, 1);
/* We need those for the test. */
chan1->is_canonical = test_chan_is_canonical;
chan1->matches_target = test_chan_matches_target;
chan1->timestamp_created = now - 9;
chan2 = new_fake_channel();
tt_assert(chan2);
/* Need to be registered to get added to the id map. */
channel_register(chan2);
tt_int_op(chan2->registered, OP_EQ, 1);
/* We need those for the test. */
chan2->is_canonical = test_chan_is_canonical;
chan2->matches_target = test_chan_matches_target;
/* Make it older than chan1. */
chan2->timestamp_created = chan1->timestamp_created - 1;
/* Set channel identities and add it to the channel map. The last one to be
* added is made the first one in the list so the lookup will always return
* that one first. */
channel_set_identity_digest(chan2, digest, &ed_id);
channel_set_identity_digest(chan1, digest, &ed_id);
tt_ptr_op(channel_find_by_remote_identity(digest, NULL), OP_EQ, chan1);
tt_ptr_op(channel_find_by_remote_identity(digest, &ed_id), OP_EQ, chan1);
/* The expected result is chan2 because it is older than chan1. */
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(ret_chan);
tt_ptr_op(ret_chan, OP_EQ, chan2);
tt_int_op(launch, OP_EQ, 0);
tt_str_op(msg, OP_EQ, "Connection is fine; using it.");
/* Switch that around from previous test. */
chan2->timestamp_created = chan1->timestamp_created + 1;
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(ret_chan);
tt_ptr_op(ret_chan, OP_EQ, chan1);
tt_int_op(launch, OP_EQ, 0);
tt_str_op(msg, OP_EQ, "Connection is fine; using it.");
/* Same creation time, num circuits will be used and they both have 0 so the
* channel 2 should be picked due to how channel_is_better() work. */
chan2->timestamp_created = chan1->timestamp_created;
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(ret_chan);
tt_ptr_op(ret_chan, OP_EQ, chan1);
tt_int_op(launch, OP_EQ, 0);
tt_str_op(msg, OP_EQ, "Connection is fine; using it.");
/* For the rest of the tests, we need channel 1 to be the older. */
chan2->timestamp_created = chan1->timestamp_created + 1;
/* Condemned the older channel. */
chan1->state = CHANNEL_STATE_CLOSING;
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(ret_chan);
tt_ptr_op(ret_chan, OP_EQ, chan2);
tt_int_op(launch, OP_EQ, 0);
tt_str_op(msg, OP_EQ, "Connection is fine; using it.");
chan1->state = CHANNEL_STATE_OPEN;
/* Make the older channel a client one. */
channel_mark_client(chan1);
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(ret_chan);
tt_ptr_op(ret_chan, OP_EQ, chan2);
tt_int_op(launch, OP_EQ, 0);
tt_str_op(msg, OP_EQ, "Connection is fine; using it.");
channel_clear_client(chan1);
/* Non matching ed identity with valid digest. */
ed25519_public_key_t dumb_ed_id;
memset(&dumb_ed_id, 0, sizeof(dumb_ed_id));
ret_chan = channel_get_for_extend(digest, &dumb_ed_id, &addr, &msg,
&launch);
tt_assert(!ret_chan);
tt_str_op(msg, OP_EQ, "Not connected. Connecting.");
tt_int_op(launch, OP_EQ, 1);
/* Opening channel, we'll check if the target address matches. */
test_chan_should_match_target = 1;
chan1->state = CHANNEL_STATE_OPENING;
chan2->state = CHANNEL_STATE_OPENING;
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(!ret_chan);
tt_str_op(msg, OP_EQ, "Connection in progress; waiting.");
tt_int_op(launch, OP_EQ, 0);
chan1->state = CHANNEL_STATE_OPEN;
chan2->state = CHANNEL_STATE_OPEN;
/* Mark channel 1 as bad for circuits. */
channel_mark_bad_for_new_circs(chan1);
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(ret_chan);
tt_ptr_op(ret_chan, OP_EQ, chan2);
tt_int_op(launch, OP_EQ, 0);
tt_str_op(msg, OP_EQ, "Connection is fine; using it.");
chan1->is_bad_for_new_circs = 0;
/* Mark both channels as unusable. */
channel_mark_bad_for_new_circs(chan1);
channel_mark_bad_for_new_circs(chan2);
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(!ret_chan);
tt_str_op(msg, OP_EQ, "Connections all too old, or too non-canonical. "
" Launching a new one.");
tt_int_op(launch, OP_EQ, 1);
chan1->is_bad_for_new_circs = 0;
chan2->is_bad_for_new_circs = 0;
/* Non canonical channels. */
test_chan_should_match_target = 0;
test_chan_canonical_should_be_reliable = 1;
ret_chan = channel_get_for_extend(digest, &ed_id, &addr, &msg, &launch);
tt_assert(!ret_chan);
tt_str_op(msg, OP_EQ, "Connections all too old, or too non-canonical. "
" Launching a new one.");
tt_int_op(launch, OP_EQ, 1);
done:
free_fake_channel(chan1);
free_fake_channel(chan2);
}
/** Process a 'create' <b>cell</b> that just arrived from <b>chan</b>. Make a
* new circuit with the p_circ_id specified in cell. Put the circuit in state
* onionskin_pending, and pass the onionskin to the cpuworker. Circ will get
* picked up again when the cpuworker finishes decrypting it.
*/
static void
command_process_create_cell(cell_t *cell, channel_t *chan)
{
or_circuit_t *circ;
const or_options_t *options = get_options();
int id_is_high;
tor_assert(cell);
tor_assert(chan);
log_debug(LD_OR,
"Got a CREATE cell for circ_id %d on channel " U64_FORMAT
" (%p)",
cell->circ_id,
U64_PRINTF_ARG(chan->global_identifier), chan);
if (we_are_hibernating()) {
log_info(LD_OR,
"Received create cell but we're shutting down. Sending back "
"destroy.");
channel_send_destroy(cell->circ_id, chan,
END_CIRC_REASON_HIBERNATING);
return;
}
if (!server_mode(options) ||
(!public_server_mode(options) && channel_is_outgoing(chan))) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received create cell (type %d) from %s, but we're connected "
"to it as a client. "
"Sending back a destroy.",
(int)cell->command, channel_get_canonical_remote_descr(chan));
channel_send_destroy(cell->circ_id, chan,
END_CIRC_REASON_TORPROTOCOL);
return;
}
/* If the high bit of the circuit ID is not as expected, close the
* circ. */
id_is_high = cell->circ_id & (1<<15);
if ((id_is_high &&
chan->circ_id_type == CIRC_ID_TYPE_HIGHER) ||
(!id_is_high &&
chan->circ_id_type == CIRC_ID_TYPE_LOWER)) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received create cell with unexpected circ_id %d. Closing.",
cell->circ_id);
channel_send_destroy(cell->circ_id, chan,
END_CIRC_REASON_TORPROTOCOL);
return;
}
if (circuit_id_in_use_on_channel(cell->circ_id, chan)) {
const node_t *node = node_get_by_id(chan->identity_digest);
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received CREATE cell (circID %d) for known circ. "
"Dropping (age %d).",
cell->circ_id, (int)(time(NULL) - channel_when_created(chan)));
if (node) {
char *p = esc_for_log(node_get_platform(node));
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Details: router %s, platform %s.",
node_describe(node), p);
tor_free(p);
}
return;
}
circ = or_circuit_new(cell->circ_id, chan);
circ->base_.purpose = CIRCUIT_PURPOSE_OR;
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_ONIONSKIN_PENDING);
if (cell->command == CELL_CREATE) {
char *onionskin = tor_malloc(ONIONSKIN_CHALLENGE_LEN);
memcpy(onionskin, cell->payload, ONIONSKIN_CHALLENGE_LEN);
/* hand it off to the cpuworkers, and then return. */
if (assign_onionskin_to_cpuworker(NULL, circ, onionskin) < 0) {
log_debug(LD_GENERAL,"Failed to hand off onionskin. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_RESOURCELIMIT);
return;
}
log_debug(LD_OR,"success: handed off onionskin.");
} else {
/* This is a CREATE_FAST cell; we can handle it immediately without using
* a CPU worker. */
char keys[CPATH_KEY_MATERIAL_LEN];
char reply[DIGEST_LEN*2];
tor_assert(cell->command == CELL_CREATE_FAST);
/* Make sure we never try to use the OR connection on which we
* received this cell to satisfy an EXTEND request, */
channel_mark_client(chan);
if (fast_server_handshake(cell->payload, (uint8_t*)reply,
(uint8_t*)keys, sizeof(keys))<0) {
log_warn(LD_OR,"Failed to generate key material. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
return;
}
if (onionskin_answer(circ, CELL_CREATED_FAST, reply, keys)<0) {
log_warn(LD_OR,"Failed to reply to CREATE_FAST cell. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
return;
}
}
}
/** Process a 'create' <b>cell</b> that just arrived from <b>chan</b>. Make a
* new circuit with the p_circ_id specified in cell. Put the circuit in state
* onionskin_pending, and pass the onionskin to the cpuworker. Circ will get
* picked up again when the cpuworker finishes decrypting it.
*/
static void
command_process_create_cell(cell_t *cell, channel_t *chan)
{
or_circuit_t *circ;
const or_options_t *options = get_options();
int id_is_high;
create_cell_t *create_cell;
tor_assert(cell);
tor_assert(chan);
log_debug(LD_OR,
"Got a CREATE cell for circ_id %u on channel " U64_FORMAT
" (%p)",
(unsigned)cell->circ_id,
U64_PRINTF_ARG(chan->global_identifier), chan);
if (we_are_hibernating()) {
log_info(LD_OR,
"Received create cell but we're shutting down. Sending back "
"destroy.");
channel_send_destroy(cell->circ_id, chan,
END_CIRC_REASON_HIBERNATING);
return;
}
if (!server_mode(options) ||
(!public_server_mode(options) && channel_is_outgoing(chan))) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received create cell (type %d) from %s, but we're connected "
"to it as a client. "
"Sending back a destroy.",
(int)cell->command, channel_get_canonical_remote_descr(chan));
channel_send_destroy(cell->circ_id, chan,
END_CIRC_REASON_TORPROTOCOL);
return;
}
if (cell->circ_id == 0) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received a create cell (type %d) from %s with zero circID; "
" ignoring.", (int)cell->command,
channel_get_actual_remote_descr(chan));
return;
}
/* If the high bit of the circuit ID is not as expected, close the
* circ. */
if (chan->wide_circ_ids)
id_is_high = cell->circ_id & (1u<<31);
else
id_is_high = cell->circ_id & (1u<<15);
if ((id_is_high &&
chan->circ_id_type == CIRC_ID_TYPE_HIGHER) ||
(!id_is_high &&
chan->circ_id_type == CIRC_ID_TYPE_LOWER)) {
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received create cell with unexpected circ_id %u. Closing.",
(unsigned)cell->circ_id);
channel_send_destroy(cell->circ_id, chan,
END_CIRC_REASON_TORPROTOCOL);
return;
}
if (circuit_id_in_use_on_channel(cell->circ_id, chan)) {
const node_t *node = node_get_by_id(chan->identity_digest);
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Received CREATE cell (circID %u) for known circ. "
"Dropping (age %d).",
(unsigned)cell->circ_id,
(int)(time(NULL) - channel_when_created(chan)));
if (node) {
char *p = esc_for_log(node_get_platform(node));
log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
"Details: router %s, platform %s.",
node_describe(node), p);
tor_free(p);
}
return;
}
circ = or_circuit_new(cell->circ_id, chan);
circ->base_.purpose = CIRCUIT_PURPOSE_OR;
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_ONIONSKIN_PENDING);
create_cell = tor_malloc_zero(sizeof(create_cell_t));
if (create_cell_parse(create_cell, cell) < 0) {
tor_free(create_cell);
log_fn(LOG_PROTOCOL_WARN, LD_OR,
"Bogus/unrecognized create cell; closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_TORPROTOCOL);
return;
}
if (create_cell->handshake_type != ONION_HANDSHAKE_TYPE_FAST) {
/* hand it off to the cpuworkers, and then return. */
if (connection_or_digest_is_known_relay(chan->identity_digest))
rep_hist_note_circuit_handshake_requested(create_cell->handshake_type);
if (assign_onionskin_to_cpuworker(NULL, circ, create_cell) < 0) {
log_debug(LD_GENERAL,"Failed to hand off onionskin. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_RESOURCELIMIT);
return;
}
log_debug(LD_OR,"success: handed off onionskin.");
} else {
/* This is a CREATE_FAST cell; we can handle it immediately without using
* a CPU worker. */
uint8_t keys[CPATH_KEY_MATERIAL_LEN];
uint8_t rend_circ_nonce[DIGEST_LEN];
int len;
created_cell_t created_cell;
/* Make sure we never try to use the OR connection on which we
* received this cell to satisfy an EXTEND request, */
channel_mark_client(chan);
memset(&created_cell, 0, sizeof(created_cell));
len = onion_skin_server_handshake(ONION_HANDSHAKE_TYPE_FAST,
create_cell->onionskin,
create_cell->handshake_len,
NULL,
created_cell.reply,
keys, CPATH_KEY_MATERIAL_LEN,
rend_circ_nonce);
tor_free(create_cell);
if (len < 0) {
log_warn(LD_OR,"Failed to generate key material. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
tor_free(create_cell);
return;
}
created_cell.cell_type = CELL_CREATED_FAST;
created_cell.handshake_len = len;
if (onionskin_answer(circ, &created_cell,
(const char *)keys, rend_circ_nonce)<0) {
log_warn(LD_OR,"Failed to reply to CREATE_FAST cell. Closing.");
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
return;
}
memwipe(keys, 0, sizeof(keys));
}
}
