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Merge branch 'onionskin_refactor_2'
This commit is contained in:
Nick Mathewson
commit
13ccca69f1
4
changes/ticket22804
Normal file
4
changes/ticket22804
Normal file
@ -0,0 +1,4 @@
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o Code simplification and refactoring:
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||||
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||||
- Split the enormous circuit_send_next_onion_skin() function into
|
||||
multiple subfunctions. Closes ticket 22804.
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||||
@ -74,6 +74,10 @@ static int onion_pick_cpath_exit(origin_circuit_t *circ, extend_info_t *exit);
|
||||
static crypt_path_t *onion_next_hop_in_cpath(crypt_path_t *cpath);
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static int onion_extend_cpath(origin_circuit_t *circ);
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static int onion_append_hop(crypt_path_t **head_ptr, extend_info_t *choice);
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static int circuit_send_first_onion_skin(origin_circuit_t *circ);
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static int circuit_build_no_more_hops(origin_circuit_t *circ);
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static int circuit_send_intermediate_onion_skin(origin_circuit_t *circ,
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crypt_path_t *hop);
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/** This function tries to get a channel to the specified endpoint,
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||||
* and then calls command_setup_channel() to give it the right
|
||||
@ -912,234 +916,275 @@ circuit_purpose_may_omit_guard(int purpose)
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* If circ's first hop is closed, then we need to build a create
|
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* cell and send it forward.
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*
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||||
* Otherwise, we need to build a relay extend cell and send it
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* forward.
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||||
* Otherwise, if circ's cpath still has any non-open hops, we need to
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||||
* build a relay extend cell and send it forward to the next non-open hop.
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||||
*
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||||
* If all hops on the cpath are open, we're done building the circuit
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* and we should do housekeeping for the newly opened circuit.
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||||
*
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||||
* Return -reason if we want to tear down circ, else return 0.
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||||
*/
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int
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circuit_send_next_onion_skin(origin_circuit_t *circ)
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||||
{
|
||||
crypt_path_t *hop;
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||||
const node_t *node;
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||||
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||||
tor_assert(circ);
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||||
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||||
if (circ->cpath->state == CPATH_STATE_CLOSED) {
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||||
/* This is the first hop. */
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create_cell_t cc;
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int fast;
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||||
int len;
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log_debug(LD_CIRC,"First skin; sending create cell.");
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memset(&cc, 0, sizeof(cc));
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if (circ->build_state->onehop_tunnel)
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control_event_bootstrap(BOOTSTRAP_STATUS_ONEHOP_CREATE, 0);
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else {
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control_event_bootstrap(BOOTSTRAP_STATUS_CIRCUIT_CREATE, 0);
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/* If this is not a one-hop tunnel, the channel is being used
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* for traffic that wants anonymity and protection from traffic
|
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* analysis (such as netflow record retention). That means we want
|
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* to pad it.
|
||||
*/
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if (circ->base_.n_chan->channel_usage < CHANNEL_USED_FOR_FULL_CIRCS)
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circ->base_.n_chan->channel_usage = CHANNEL_USED_FOR_FULL_CIRCS;
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}
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node = node_get_by_id(circ->base_.n_chan->identity_digest);
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fast = should_use_create_fast_for_circuit(circ);
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||||
if (!fast) {
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||||
/* We are an OR and we know the right onion key: we should
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* send a create cell.
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*/
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||||
circuit_pick_create_handshake(&cc.cell_type, &cc.handshake_type,
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circ->cpath->extend_info);
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} else {
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/* We are not an OR, and we're building the first hop of a circuit to a
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* new OR: we can be speedy and use CREATE_FAST to save an RSA operation
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||||
* and a DH operation. */
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cc.cell_type = CELL_CREATE_FAST;
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cc.handshake_type = ONION_HANDSHAKE_TYPE_FAST;
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}
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len = onion_skin_create(cc.handshake_type,
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circ->cpath->extend_info,
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&circ->cpath->handshake_state,
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cc.onionskin);
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if (len < 0) {
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log_warn(LD_CIRC,"onion_skin_create (first hop) failed.");
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return - END_CIRC_REASON_INTERNAL;
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||||
}
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||||
cc.handshake_len = len;
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||||
|
||||
if (circuit_deliver_create_cell(TO_CIRCUIT(circ), &cc, 0) < 0)
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||||
return - END_CIRC_REASON_RESOURCELIMIT;
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||||
|
||||
circ->cpath->state = CPATH_STATE_AWAITING_KEYS;
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circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_BUILDING);
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log_info(LD_CIRC,"First hop: finished sending %s cell to '%s'",
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fast ? "CREATE_FAST" : "CREATE",
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node ? node_describe(node) : "<unnamed>");
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} else {
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||||
extend_cell_t ec;
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||||
int len;
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||||
tor_assert(circ->cpath->state == CPATH_STATE_OPEN);
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||||
tor_assert(circ->base_.state == CIRCUIT_STATE_BUILDING);
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log_debug(LD_CIRC,"starting to send subsequent skin.");
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hop = onion_next_hop_in_cpath(circ->cpath);
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memset(&ec, 0, sizeof(ec));
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if (!hop) {
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||||
/* done building the circuit. whew. */
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guard_usable_t r;
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if (! circ->guard_state) {
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||||
if (circuit_get_cpath_len(circ) != 1 &&
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! circuit_purpose_may_omit_guard(circ->base_.purpose) &&
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get_options()->UseEntryGuards) {
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log_warn(LD_BUG, "%d-hop circuit %p with purpose %d has no "
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"guard state",
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circuit_get_cpath_len(circ), circ, circ->base_.purpose);
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}
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r = GUARD_USABLE_NOW;
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} else {
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r = entry_guard_succeeded(&circ->guard_state);
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}
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||||
const int is_usable_for_streams = (r == GUARD_USABLE_NOW);
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if (r == GUARD_USABLE_NOW) {
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circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_OPEN);
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||||
} else if (r == GUARD_MAYBE_USABLE_LATER) {
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||||
// Wait till either a better guard succeeds, or till
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||||
// all better guards fail.
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||||
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_GUARD_WAIT);
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} else {
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tor_assert_nonfatal(r == GUARD_USABLE_NEVER);
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return - END_CIRC_REASON_INTERNAL;
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}
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||||
|
||||
/* XXXX #21422 -- the rest of this branch needs careful thought!
|
||||
* Some of the things here need to happen when a circuit becomes
|
||||
* mechanically open; some need to happen when it is actually usable.
|
||||
* I think I got them right, but more checking would be wise. -NM
|
||||
*/
|
||||
|
||||
if (circuit_timeout_want_to_count_circ(circ)) {
|
||||
struct timeval end;
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||||
long timediff;
|
||||
tor_gettimeofday(&end);
|
||||
timediff = tv_mdiff(&circ->base_.timestamp_began, &end);
|
||||
|
||||
/*
|
||||
* If the circuit build time is much greater than we would have cut
|
||||
* it off at, we probably had a suspend event along this codepath,
|
||||
* and we should discard the value.
|
||||
*/
|
||||
if (timediff < 0 ||
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||||
timediff > 2*get_circuit_build_close_time_ms()+1000) {
|
||||
log_notice(LD_CIRC, "Strange value for circuit build time: %ldmsec. "
|
||||
"Assuming clock jump. Purpose %d (%s)", timediff,
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circ->base_.purpose,
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||||
circuit_purpose_to_string(circ->base_.purpose));
|
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} else if (!circuit_build_times_disabled(get_options())) {
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/* Only count circuit times if the network is live */
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if (circuit_build_times_network_check_live(
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get_circuit_build_times())) {
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circuit_build_times_add_time(get_circuit_build_times_mutable(),
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(build_time_t)timediff);
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circuit_build_times_set_timeout(get_circuit_build_times_mutable());
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||||
}
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||||
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||||
if (circ->base_.purpose != CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
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circuit_build_times_network_circ_success(
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get_circuit_build_times_mutable());
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}
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}
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}
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log_info(LD_CIRC,"circuit built!");
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circuit_reset_failure_count(0);
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if (circ->build_state->onehop_tunnel || circ->has_opened) {
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control_event_bootstrap(BOOTSTRAP_STATUS_REQUESTING_STATUS, 0);
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}
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||||
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||||
pathbias_count_build_success(circ);
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||||
circuit_rep_hist_note_result(circ);
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if (is_usable_for_streams)
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circuit_has_opened(circ); /* do other actions as necessary */
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if (!have_completed_a_circuit() && !circ->build_state->onehop_tunnel) {
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const or_options_t *options = get_options();
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note_that_we_completed_a_circuit();
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/* FFFF Log a count of known routers here */
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log_notice(LD_GENERAL,
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"Tor has successfully opened a circuit. "
|
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"Looks like client functionality is working.");
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if (control_event_bootstrap(BOOTSTRAP_STATUS_DONE, 0) == 0) {
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log_notice(LD_GENERAL,
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"Tor has successfully opened a circuit. "
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||||
"Looks like client functionality is working.");
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}
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control_event_client_status(LOG_NOTICE, "CIRCUIT_ESTABLISHED");
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clear_broken_connection_map(1);
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if (server_mode(options) && !check_whether_orport_reachable(options)) {
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inform_testing_reachability();
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consider_testing_reachability(1, 1);
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}
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}
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|
||||
/* We're done with measurement circuits here. Just close them */
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if (circ->base_.purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
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circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_FINISHED);
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}
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return 0;
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}
|
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|
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if (tor_addr_family(&hop->extend_info->addr) != AF_INET) {
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log_warn(LD_BUG, "Trying to extend to a non-IPv4 address.");
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return - END_CIRC_REASON_INTERNAL;
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}
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circuit_pick_extend_handshake(&ec.cell_type,
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&ec.create_cell.cell_type,
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&ec.create_cell.handshake_type,
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hop->extend_info);
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tor_addr_copy(&ec.orport_ipv4.addr, &hop->extend_info->addr);
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ec.orport_ipv4.port = hop->extend_info->port;
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tor_addr_make_unspec(&ec.orport_ipv6.addr);
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memcpy(ec.node_id, hop->extend_info->identity_digest, DIGEST_LEN);
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/* Set the ED25519 identity too -- it will only get included
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* in the extend2 cell if we're configured to use it, though. */
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ed25519_pubkey_copy(&ec.ed_pubkey, &hop->extend_info->ed_identity);
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len = onion_skin_create(ec.create_cell.handshake_type,
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hop->extend_info,
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&hop->handshake_state,
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ec.create_cell.onionskin);
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if (len < 0) {
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log_warn(LD_CIRC,"onion_skin_create failed.");
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return - END_CIRC_REASON_INTERNAL;
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}
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ec.create_cell.handshake_len = len;
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|
||||
log_info(LD_CIRC,"Sending extend relay cell.");
|
||||
{
|
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uint8_t command = 0;
|
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uint16_t payload_len=0;
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uint8_t payload[RELAY_PAYLOAD_SIZE];
|
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if (extend_cell_format(&command, &payload_len, payload, &ec)<0) {
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log_warn(LD_CIRC,"Couldn't format extend cell");
|
||||
return -END_CIRC_REASON_INTERNAL;
|
||||
}
|
||||
|
||||
/* send it to hop->prev, because it will transfer
|
||||
* it to a create cell and then send to hop */
|
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if (relay_send_command_from_edge(0, TO_CIRCUIT(circ),
|
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command,
|
||||
(char*)payload, payload_len,
|
||||
hop->prev) < 0)
|
||||
return 0; /* circuit is closed */
|
||||
}
|
||||
hop->state = CPATH_STATE_AWAITING_KEYS;
|
||||
/* Case one: we're on the first hop. */
|
||||
return circuit_send_first_onion_skin(circ);
|
||||
}
|
||||
|
||||
tor_assert(circ->cpath->state == CPATH_STATE_OPEN);
|
||||
tor_assert(circ->base_.state == CIRCUIT_STATE_BUILDING);
|
||||
crypt_path_t *hop = onion_next_hop_in_cpath(circ->cpath);
|
||||
|
||||
if (hop) {
|
||||
/* Case two: we're on a hop after the first. */
|
||||
return circuit_send_intermediate_onion_skin(circ, hop);
|
||||
}
|
||||
|
||||
/* Case three: the circuit is finished. Do housekeeping tasks on it. */
|
||||
return circuit_build_no_more_hops(circ);
|
||||
}
|
||||
|
||||
/**
|
||||
* Called from circuit_send_next_onion_skin() when we find ourselves connected
|
||||
* to the first hop in <b>circ</b>: Send a CREATE or CREATE2 or CREATE_FAST
|
||||
* cell to that hop. Return 0 on success; -reason on failure (if the circuit
|
||||
* should be torn down).
|
||||
*/
|
||||
static int
|
||||
circuit_send_first_onion_skin(origin_circuit_t *circ)
|
||||
{
|
||||
int fast;
|
||||
int len;
|
||||
const node_t *node;
|
||||
create_cell_t cc;
|
||||
memset(&cc, 0, sizeof(cc));
|
||||
|
||||
log_debug(LD_CIRC,"First skin; sending create cell.");
|
||||
|
||||
if (circ->build_state->onehop_tunnel) {
|
||||
control_event_bootstrap(BOOTSTRAP_STATUS_ONEHOP_CREATE, 0);
|
||||
} else {
|
||||
control_event_bootstrap(BOOTSTRAP_STATUS_CIRCUIT_CREATE, 0);
|
||||
|
||||
/* If this is not a one-hop tunnel, the channel is being used
|
||||
* for traffic that wants anonymity and protection from traffic
|
||||
* analysis (such as netflow record retention). That means we want
|
||||
* to pad it.
|
||||
*/
|
||||
if (circ->base_.n_chan->channel_usage < CHANNEL_USED_FOR_FULL_CIRCS)
|
||||
circ->base_.n_chan->channel_usage = CHANNEL_USED_FOR_FULL_CIRCS;
|
||||
}
|
||||
|
||||
node = node_get_by_id(circ->base_.n_chan->identity_digest);
|
||||
fast = should_use_create_fast_for_circuit(circ);
|
||||
if (!fast) {
|
||||
/* We know the right onion key: we should send a create cell. */
|
||||
circuit_pick_create_handshake(&cc.cell_type, &cc.handshake_type,
|
||||
circ->cpath->extend_info);
|
||||
} else {
|
||||
/* We don't know an onion key, so we need to fall back to CREATE_FAST. */
|
||||
cc.cell_type = CELL_CREATE_FAST;
|
||||
cc.handshake_type = ONION_HANDSHAKE_TYPE_FAST;
|
||||
}
|
||||
|
||||
len = onion_skin_create(cc.handshake_type,
|
||||
circ->cpath->extend_info,
|
||||
&circ->cpath->handshake_state,
|
||||
cc.onionskin);
|
||||
if (len < 0) {
|
||||
log_warn(LD_CIRC,"onion_skin_create (first hop) failed.");
|
||||
return - END_CIRC_REASON_INTERNAL;
|
||||
}
|
||||
cc.handshake_len = len;
|
||||
|
||||
if (circuit_deliver_create_cell(TO_CIRCUIT(circ), &cc, 0) < 0)
|
||||
return - END_CIRC_REASON_RESOURCELIMIT;
|
||||
|
||||
circ->cpath->state = CPATH_STATE_AWAITING_KEYS;
|
||||
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_BUILDING);
|
||||
log_info(LD_CIRC,"First hop: finished sending %s cell to '%s'",
|
||||
fast ? "CREATE_FAST" : "CREATE",
|
||||
node ? node_describe(node) : "<unnamed>");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Called from circuit_send_next_onion_skin() when we find that we have no
|
||||
* more hops: mark the circuit as finished, and perform the necessary
|
||||
* bookkeeping. Return 0 on success; -reason on failure (if the circuit
|
||||
* should be torn down).
|
||||
*/
|
||||
static int
|
||||
circuit_build_no_more_hops(origin_circuit_t *circ)
|
||||
{
|
||||
guard_usable_t r;
|
||||
if (! circ->guard_state) {
|
||||
if (circuit_get_cpath_len(circ) != 1 &&
|
||||
! circuit_purpose_may_omit_guard(circ->base_.purpose) &&
|
||||
get_options()->UseEntryGuards) {
|
||||
log_warn(LD_BUG, "%d-hop circuit %p with purpose %d has no "
|
||||
"guard state",
|
||||
circuit_get_cpath_len(circ), circ, circ->base_.purpose);
|
||||
}
|
||||
r = GUARD_USABLE_NOW;
|
||||
} else {
|
||||
r = entry_guard_succeeded(&circ->guard_state);
|
||||
}
|
||||
const int is_usable_for_streams = (r == GUARD_USABLE_NOW);
|
||||
if (r == GUARD_USABLE_NOW) {
|
||||
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_OPEN);
|
||||
} else if (r == GUARD_MAYBE_USABLE_LATER) {
|
||||
// Wait till either a better guard succeeds, or till
|
||||
// all better guards fail.
|
||||
circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_GUARD_WAIT);
|
||||
} else {
|
||||
tor_assert_nonfatal(r == GUARD_USABLE_NEVER);
|
||||
return - END_CIRC_REASON_INTERNAL;
|
||||
}
|
||||
|
||||
/* XXXX #21422 -- the rest of this branch needs careful thought!
|
||||
* Some of the things here need to happen when a circuit becomes
|
||||
* mechanically open; some need to happen when it is actually usable.
|
||||
* I think I got them right, but more checking would be wise. -NM
|
||||
*/
|
||||
|
||||
if (circuit_timeout_want_to_count_circ(circ)) {
|
||||
struct timeval end;
|
||||
long timediff;
|
||||
tor_gettimeofday(&end);
|
||||
timediff = tv_mdiff(&circ->base_.timestamp_began, &end);
|
||||
|
||||
/*
|
||||
* If the circuit build time is much greater than we would have cut
|
||||
* it off at, we probably had a suspend event along this codepath,
|
||||
* and we should discard the value.
|
||||
*/
|
||||
if (timediff < 0 ||
|
||||
timediff > 2*get_circuit_build_close_time_ms()+1000) {
|
||||
log_notice(LD_CIRC, "Strange value for circuit build time: %ldmsec. "
|
||||
"Assuming clock jump. Purpose %d (%s)", timediff,
|
||||
circ->base_.purpose,
|
||||
circuit_purpose_to_string(circ->base_.purpose));
|
||||
} else if (!circuit_build_times_disabled(get_options())) {
|
||||
/* Only count circuit times if the network is live */
|
||||
if (circuit_build_times_network_check_live(
|
||||
get_circuit_build_times())) {
|
||||
circuit_build_times_add_time(get_circuit_build_times_mutable(),
|
||||
(build_time_t)timediff);
|
||||
circuit_build_times_set_timeout(get_circuit_build_times_mutable());
|
||||
}
|
||||
|
||||
if (circ->base_.purpose != CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
|
||||
circuit_build_times_network_circ_success(
|
||||
get_circuit_build_times_mutable());
|
||||
}
|
||||
}
|
||||
}
|
||||
log_info(LD_CIRC,"circuit built!");
|
||||
circuit_reset_failure_count(0);
|
||||
|
||||
if (circ->build_state->onehop_tunnel || circ->has_opened) {
|
||||
control_event_bootstrap(BOOTSTRAP_STATUS_REQUESTING_STATUS, 0);
|
||||
}
|
||||
|
||||
pathbias_count_build_success(circ);
|
||||
circuit_rep_hist_note_result(circ);
|
||||
if (is_usable_for_streams)
|
||||
circuit_has_opened(circ); /* do other actions as necessary */
|
||||
|
||||
if (!have_completed_a_circuit() && !circ->build_state->onehop_tunnel) {
|
||||
const or_options_t *options = get_options();
|
||||
note_that_we_completed_a_circuit();
|
||||
/* FFFF Log a count of known routers here */
|
||||
log_notice(LD_GENERAL,
|
||||
"Tor has successfully opened a circuit. "
|
||||
"Looks like client functionality is working.");
|
||||
if (control_event_bootstrap(BOOTSTRAP_STATUS_DONE, 0) == 0) {
|
||||
log_notice(LD_GENERAL,
|
||||
"Tor has successfully opened a circuit. "
|
||||
"Looks like client functionality is working.");
|
||||
}
|
||||
control_event_client_status(LOG_NOTICE, "CIRCUIT_ESTABLISHED");
|
||||
clear_broken_connection_map(1);
|
||||
if (server_mode(options) && !check_whether_orport_reachable(options)) {
|
||||
inform_testing_reachability();
|
||||
consider_testing_reachability(1, 1);
|
||||
}
|
||||
}
|
||||
|
||||
/* We're done with measurement circuits here. Just close them */
|
||||
if (circ->base_.purpose == CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT) {
|
||||
circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_FINISHED);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Called from circuit_send_next_onion_skin() when we find that we have a hop
|
||||
* other than the first that we need to extend to: use <b>hop</b>'s
|
||||
* information to extend the circuit another step. Return 0 on success;
|
||||
* -reason on failure (if the circuit should be torn down).
|
||||
*/
|
||||
static int
|
||||
circuit_send_intermediate_onion_skin(origin_circuit_t *circ,
|
||||
crypt_path_t *hop)
|
||||
{
|
||||
int len;
|
||||
extend_cell_t ec;
|
||||
memset(&ec, 0, sizeof(ec));
|
||||
|
||||
log_debug(LD_CIRC,"starting to send subsequent skin.");
|
||||
|
||||
if (tor_addr_family(&hop->extend_info->addr) != AF_INET) {
|
||||
log_warn(LD_BUG, "Trying to extend to a non-IPv4 address.");
|
||||
return - END_CIRC_REASON_INTERNAL;
|
||||
}
|
||||
|
||||
circuit_pick_extend_handshake(&ec.cell_type,
|
||||
&ec.create_cell.cell_type,
|
||||
&ec.create_cell.handshake_type,
|
||||
hop->extend_info);
|
||||
|
||||
tor_addr_copy(&ec.orport_ipv4.addr, &hop->extend_info->addr);
|
||||
ec.orport_ipv4.port = hop->extend_info->port;
|
||||
tor_addr_make_unspec(&ec.orport_ipv6.addr);
|
||||
memcpy(ec.node_id, hop->extend_info->identity_digest, DIGEST_LEN);
|
||||
/* Set the ED25519 identity too -- it will only get included
|
||||
* in the extend2 cell if we're configured to use it, though. */
|
||||
ed25519_pubkey_copy(&ec.ed_pubkey, &hop->extend_info->ed_identity);
|
||||
|
||||
len = onion_skin_create(ec.create_cell.handshake_type,
|
||||
hop->extend_info,
|
||||
&hop->handshake_state,
|
||||
ec.create_cell.onionskin);
|
||||
if (len < 0) {
|
||||
log_warn(LD_CIRC,"onion_skin_create failed.");
|
||||
return - END_CIRC_REASON_INTERNAL;
|
||||
}
|
||||
ec.create_cell.handshake_len = len;
|
||||
|
||||
log_info(LD_CIRC,"Sending extend relay cell.");
|
||||
{
|
||||
uint8_t command = 0;
|
||||
uint16_t payload_len=0;
|
||||
uint8_t payload[RELAY_PAYLOAD_SIZE];
|
||||
if (extend_cell_format(&command, &payload_len, payload, &ec)<0) {
|
||||
log_warn(LD_CIRC,"Couldn't format extend cell");
|
||||
return -END_CIRC_REASON_INTERNAL;
|
||||
}
|
||||
|
||||
/* send it to hop->prev, because that relay will transfer
|
||||
* it to a create cell and then send to hop */
|
||||
if (relay_send_command_from_edge(0, TO_CIRCUIT(circ),
|
||||
command,
|
||||
(char*)payload, payload_len,
|
||||
hop->prev) < 0)
|
||||
return 0; /* circuit is closed */
|
||||
}
|
||||
hop->state = CPATH_STATE_AWAITING_KEYS;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user