From 24b9b9f791defcb6156c587a035fde58c35a46d9 Mon Sep 17 00:00:00 2001 From: Mike Perry Date: Fri, 18 Jan 2013 19:29:17 -0800 Subject: [PATCH] Roll back the path_state for circs if we detatch a stream. An adversary could let the first stream request succeed (ie the resolve), but then tag and timeout the remainder (via cell dropping), forcing them on new circuits. Rolling back the state will cause us to probe such circuits, which should lead to probe failures in the event of such tagging due to either unrecognized cells coming in while we wait for the probe, or the cipher state getting out of sync in the case of dropped cells. --- src/or/connection_edge.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/src/or/connection_edge.c b/src/or/connection_edge.c index 41795acb6c..9e2c15d2ca 100644 --- a/src/or/connection_edge.c +++ b/src/or/connection_edge.c @@ -637,6 +637,16 @@ connection_ap_expire_beginning(void) } if (circ->purpose == CIRCUIT_PURPOSE_C_REND_JOINED) { if (seconds_idle >= options->SocksTimeout) { + /* Path bias: We need to probe the circuit to ensure validity. + * Roll its state back if it succeeded so that we do so upon close. */ + if (TO_ORIGIN_CIRCUIT(circ)->path_state == PATH_STATE_USE_SUCCEEDED) { + log_info(LD_CIRC, + "Rolling back pathbias use state to 'attempted' for timed " + "out rend circ %d", + TO_ORIGIN_CIRCUIT(circ)->global_identifier); + TO_ORIGIN_CIRCUIT(circ)->path_state = PATH_STATE_USE_ATTEMPTED; + } + log_fn(severity, LD_REND, "Rend stream is %d seconds late. Giving up on address" " '%s.onion'.", @@ -806,6 +816,15 @@ connection_ap_detach_retriable(entry_connection_t *conn, control_event_stream_status(conn, STREAM_EVENT_FAILED_RETRIABLE, reason); ENTRY_TO_CONN(conn)->timestamp_lastread = time(NULL); + /* Path bias: We need to probe the circuit to ensure validity. + * Roll its state back if it succeeded so that we do so upon close. */ + if (circ->path_state == PATH_STATE_USE_SUCCEEDED) { + log_info(LD_CIRC, + "Rolling back pathbias use state to 'attempted' for detached " + "circuit %d", circ->global_identifier); + circ->path_state = PATH_STATE_USE_ATTEMPTED; + } + if (conn->pending_optimistic_data) { generic_buffer_set_to_copy(&conn->sending_optimistic_data, conn->pending_optimistic_data);