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Add rate-limiting sampling mechanism for weird events

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The generation of weird events, by default, are now rate-limited
according to these tunable options:

  - Weird::sampling_whitelist
  - Weird::sampling_threshold
  - Weird::sampling_rate
  - Weird::sampling_duration

The new get_reporter_stats() BIF also allows one to query the
total number of weirds generated (pre-sampling) which the new
policy/misc/weird-stats.bro script uses periodically to populate
a weird_stats.log.

There's also new reporter BIFs to allow generating weirds from the
script-layer such that they go through the same, internal
rate-limiting/sampling mechanisms:

  - Reporter::conn_weird
  - Reporter::flow_weird
  - Reporter::net_weird

Some of the code was adapted from previous work by Johanna Amann.
This commit is contained in:
Jon Siwek 2018-07-26 19:57:36 -05:00
parent e60b0bfb25
commit 35827eeb31
25 changed files with 1037 additions and 10 deletions
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2
scripts/base/protocols/http/main.bro
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@ -199,7 +199,7 @@ event http_request(c: connection, method: string, original_URI: string,
c$http$uri = unescaped_URI;
if ( method !in http_methods )
event conn_weird("unknown_HTTP_method", c, method);
Reporter::conn_weird("unknown_HTTP_method", c, method);
}
event http_reply(c: connection, version: string, code: count, reason: string) &priority=5