commit 1bb4a4f9bdf24706a459e4aefb2b0fb75622f7ac Author: Nick Mathewson nickm@torproject.org Date: Tue Aug 20 14:52:56 2013 -0400

Send NETINFO on receiving a NETINFO if we have not yet sent one.

Relays previously, when initiating a connection, would only send a NETINFO after sending an AUTHENTICATE. But bridges, when receiving a connection, would never send AUTH_CHALLENGE. So relays wouldn't AUTHENTICATE, and wouldn't NETINFO, and then bridges would be surprised to be receiving CREATE cells on a non-open circuit.

Fixes bug 9546. --- changes/bug9546 | 5 +++++ src/or/channeltls.c | 10 ++++++++++ src/or/connection_or.c | 7 +++++++ src/or/or.h | 3 +++ 4 files changed, 25 insertions(+)

diff --git a/changes/bug9546 b/changes/bug9546 new file mode 100644 index 0000000..8596eac --- /dev/null +++ b/changes/bug9546 @@ -0,0 +1,5 @@ + o Major bugfixes: + + - When a relay is extending a circuit to a bridge, it needs to send a + NETINFO cell, even when the bridge hasn't sent an AUTH_CHALLENGE + cell. Fixes bug 9546; bugfix on ????. diff --git a/src/or/channeltls.c b/src/or/channeltls.c index d758d22..a7953e7 100644 --- a/src/or/channeltls.c +++ b/src/or/channeltls.c @@ -1474,6 +1474,16 @@ channel_tls_process_netinfo_cell(cell_t *cell, channel_tls_t *chan) /* XXX maybe act on my_apparent_addr, if the source is sufficiently * trustworthy. */

+ if (! chan->conn->handshake_state->sent_netinfo) { + /* If we were prepared to authenticate, but we never got an AUTH_CHALLENGE + * cell, then we would not previously have sent a NETINFO cell. Do so + * now. */ + if (connection_or_send_netinfo(chan->conn) < 0) { + connection_or_close_for_error(chan->conn, 0); + return; + } + } + if (connection_or_set_state_open(chan->conn) < 0) { log_fn(LOG_PROTOCOL_WARN, LD_OR, "Got good NETINFO cell from %s:%d; but " diff --git a/src/or/connection_or.c b/src/or/connection_or.c index 3616363..31cc9c7 100644 --- a/src/or/connection_or.c +++ b/src/or/connection_or.c @@ -2042,6 +2042,12 @@ connection_or_send_netinfo(or_connection_t *conn)

tor_assert(conn->handshake_state);

+ if (conn->handshake_state->sent_netinfo) { + log_warn(LD_BUG, "Attempted to send an extra netinfo cell on a connection " + "where we already sent one."); + return 0; + } + memset(&cell, 0, sizeof(cell_t)); cell.command = CELL_NETINFO;

@@ -2083,6 +2089,7 @@ connection_or_send_netinfo(or_connection_t *conn) }

conn->handshake_state->digest_sent_data = 0; + conn->handshake_state->sent_netinfo = 1; connection_or_write_cell_to_buf(&cell, conn);

return 0; diff --git a/src/or/or.h b/src/or/or.h index 3dc96b9..8c6c1e3 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -1357,6 +1357,9 @@ typedef struct or_handshake_state_t { /* True iff we've received valid authentication to some identity. */ unsigned int authenticated : 1;

+ /* True iff we have sent a netinfo cell */ + unsigned int sent_netinfo : 1; + /** True iff we should feed outgoing cells into digest_sent and * digest_received respectively. *