commit f0e4120996d3a96252200ea5302dcde3af6e0bc0 Author: Nick Mathewson nickm@torproject.org Date: Wed Sep 18 15:38:33 2019 -0400

Add a rate-limit to our warning about the disabled .exit notation

This warning would previously be given every time we tried to open a connection to a foo.exit address, which could potentially be used to flood the logs. Now, we don't allow this warning to appear more than once every 15 minutes.

Fixes bug 31466; bugfix on 0.2.2.1-alpha, when .exit was first deprecated. --- changes/ticket31466 | 5 +++++ src/or/connection_edge.c | 8 +++++--- 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/changes/ticket31466 b/changes/ticket31466 new file mode 100644 index 000000000..e535b4502 --- /dev/null +++ b/changes/ticket31466 @@ -0,0 +1,5 @@ + o Minor bugfixes (logging): + - Rate-limit our the logging message about the obsolete .exit notation. + Previously, there was no limit on this warning, which could potentially + be triggered many times by a hostile website. Fixes bug 31466; + bugfix on 0.2.2.1-alpha. diff --git a/src/or/connection_edge.c b/src/or/connection_edge.c index 7a97c632d..5638d9a1b 100644 --- a/src/or/connection_edge.c +++ b/src/or/connection_edge.c @@ -1186,9 +1186,11 @@ connection_ap_handshake_rewrite(entry_connection_t *conn, * disallowed when they're coming straight from the client, but you're * allowed to have them in MapAddress commands and so forth. */ if (!strcmpend(socks->address, ".exit") && !options->AllowDotExit) { - log_warn(LD_APP, "The ".exit" notation is disabled in Tor due to " - "security risks. Set AllowDotExit in your torrc to enable " - "it (at your own risk)."); + static ratelim_t exit_warning_limit = RATELIM_INIT(60*15); + log_fn_ratelim(&exit_warning_limit, LOG_WARN, LD_APP, + "The ".exit" notation is disabled in Tor due to " + "security risks. Set AllowDotExit in your torrc to enable " + "it (at your own risk)."); control_event_client_status(LOG_WARN, "SOCKS_BAD_HOSTNAME HOSTNAME=%s", escaped(socks->address)); out->end_reason = END_STREAM_REASON_TORPROTOCOL;