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Fix DSL string-escaping bug breaking compilation of 2 A10 rules

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Both rule89 (a10_session_opened) and rule91 (a10_session_timeout)
failed to compile live: \\" (two backslashes before a quote) is
read by Graylog's rule DSL as an escaped backslash followed by an
unescaped string terminator, not an escaped quote - so the regex()
string literal ended early and everything after it parsed as
garbage ("Unknown function S", "mismatched input '('", etc).

Fix: exactly one backslash before each quote (\") so the DSL treats
it as an escaped quote character, matching the \S/\d/\. occurrences
elsewhere in the same pattern which correctly use two backslashes
(DSL-decodes to one, which is what the regex engine needs). The
other 4 new A10 rules didn't have this issue and already compiled
successfully on the user's first live run.
This commit is contained in:
byrsapty 2026-08-28 13:29:20 +03:00
parent b0e4095cae
commit c382cb6b72
2 changed files with 2 additions and 2 deletions
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2
rules/rule89_a10_session_opened.json
View file

@ -1,5 +1,5 @@
{
"title": "a10_session_opened",
"description": "A10: admin session opened (covers both 'aXAPI session' and 'cli session' wording - same event, different access method). Built from real captured A10 syslog output.",
"source": "rule \"a10_session_opened\"\nwhen\n contains(to_string($message.message), \"session for user\") && contains(to_string($message.message), \"has been opened\")\nthen\n set_field(\"vendor\", \"a10\");\n set_field(\"event_type\", \"session_opened\");\n let m = regex(\"session for user \\\\\"(\\\\S+)\\\\\" from (\\\\S+) has been opened\\\\. Session ID assigned is (\\\\d+)\", to_string($message.message), [\"user\",\"src_ip\",\"session_id\"]);\n set_field(\"a10_user\", m[\"user\"]);\n set_field(\"src_ip\", m[\"src_ip\"]);\n set_field(\"a10_session_id\", m[\"session_id\"]);\nend"
"source": "rule \"a10_session_opened\"\nwhen\n contains(to_string($message.message), \"session for user\") && contains(to_string($message.message), \"has been opened\")\nthen\n set_field(\"vendor\", \"a10\");\n set_field(\"event_type\", \"session_opened\");\n let m = regex(\"session for user \\\"(\\\\S+)\\\" from (\\\\S+) has been opened\\\\. Session ID assigned is (\\\\d+)\", to_string($message.message), [\"user\",\"src_ip\",\"session_id\"]);\n set_field(\"a10_user\", m[\"user\"]);\n set_field(\"src_ip\", m[\"src_ip\"]);\n set_field(\"a10_session_id\", m[\"session_id\"]);\nend"
}

2
rules/rule91_a10_session_timeout.json
View file

@ -1,5 +1,5 @@
{
"title": "a10_session_timeout",
"description": "A10: admin session timed out from inactivity (the detailed line naming session id/user/src_ip - the generic preceding 'Session timed out' line is a duplicate summary of the same event and is deliberately left unclassified). Built from real captured A10 syslog output.",
"source": "rule \"a10_session_timeout\"\nwhen\n contains(to_string($message.message), \"has timed out\")\nthen\n set_field(\"vendor\", \"a10\");\n set_field(\"event_type\", \"session_timeout\");\n let m = regex(\"Session ID (\\\\d+) for user \\\\\"(\\\\S+)\\\\\" from (\\\\S+) has timed out\", to_string($message.message), [\"session_id\",\"user\",\"src_ip\"]);\n set_field(\"a10_session_id\", m[\"session_id\"]);\n set_field(\"a10_user\", m[\"user\"]);\n set_field(\"src_ip\", m[\"src_ip\"]);\nend"
"source": "rule \"a10_session_timeout\"\nwhen\n contains(to_string($message.message), \"has timed out\")\nthen\n set_field(\"vendor\", \"a10\");\n set_field(\"event_type\", \"session_timeout\");\n let m = regex(\"Session ID (\\\\d+) for user \\\"(\\\\S+)\\\" from (\\\\S+) has timed out\", to_string($message.message), [\"session_id\",\"user\",\"src_ip\"]);\n set_field(\"a10_session_id\", m[\"session_id\"]);\n set_field(\"a10_user\", m[\"user\"]);\n set_field(\"src_ip\", m[\"src_ip\"]);\nend"
}