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suricata/rules/imap-events.rules

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imap: implement parser This introduces a parser for IMAP protocol, replacing the detection-only implementation. An IMAP transaction has two states driven by the 'complete' field: - Open (complete = false): waiting for a matching tagged response. - Complete (complete = true): tagged response received, or special conditions met (BYE, server greeting). Completion logic (is_complete): - If a tagged request exists: requires a matching tagged response. - No tagged request + BYE: complete (server closing). - No tagged request + any response: complete (server greeting). Transactions are created in three places: 1. Request parser: every parsed command creates a new tx. 2. Response parser (tagged, no matching request): midstream/async; orphan tagged response gets its own tx. 3. Response parser (untagged, no incomplete tx): server greeting or unsolicited response. Once open, messages accumulate: - Request side: continuation and literal data attach to the most recent incomplete tx. - Response side: untagged responses attach to the most recent incomplete tx; tagged responses attach via find_request(tag). Literals, sent by the client (e.g. APPEND) or by the server (e.g. FETCH), are consumed incrementally and their content is not retained. Hard limits prevent unbounded growth: - IMAP_MAX_TX (256, configurable): total transactions. Exceeded: all incomplete txs force-completed with TooManyTransactions event. - IMAP_MAX_MSGS_PER_TX (512): requests per tx. Exceeded: request dropped, DataLimitReached event. - IMAP_MAX_LINES (512): response lines per tx. Exceeded: line dropped, DataLimitReached event. - IMAP_MAX_LINE_BYTES_PER_STATE (100MB): retained request and response data per flow. Exceeded: data dropped, DataLimitReached event. - IMAP_MAX_LINE_SIZE (8KB): request/response line max length. Exceeded: LineTooLong event. - Literal size: bounded by declared size in {N} specifier. IMAP_MAX_TX only is configurable limit via app-layer.protocols.imap.max-tx. Ticket #8276
9 months ago
# IMAP app layer event rules
#
# SID's fall in the 2244000+ range. See rules/README.md
alert imap any any -> any any (msg:"SURICATA IMAP too many transactions"; app-layer-event:imap.too_many_transactions; classtype:protocol-command-decode; sid:2244000; rev:1;)
alert imap any any -> any any (msg:"SURICATA IMAP invalid data"; app-layer-event:imap.invalid_data; classtype:protocol-command-decode; sid:2244001; rev:1;)
alert imap any any -> any any (msg:"SURICATA IMAP line too long"; app-layer-event:imap.line_too_long; classtype:protocol-command-decode; sid:2244002; rev:1;)
alert imap any any -> any any (msg:"SURICATA IMAP data limit reached"; app-layer-event:imap.data_limit_reached; classtype:protocol-command-decode; sid:2244003; rev:1;)