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c8103dd963
This adds a signatures/http-body-match btest to verify how the signature framework matches HTTP body in requests and responses. It currently fails because the 'http-request-body' and 'http-reply-body' clauses never match anything when there is a '$' in their regular expressions. The other pattern clauses such as the 'payload' clause do not suffer from that restriction and it is not documented as a limitation of HTTP body pattern clauses either, so it is probably a bug. The "http-body-match" btest shows that without a fix any signatures which ends with a '$' in a http-request-body or http-reply-body rule will never raise a signature_match() event, and that signatures which do not end with a '$' cannot distinguish an HTTP body prefixed by the matching pattern (ex: ABCD) from an HTTP body consisting entirely of the matching pattern (ex: AB). Test cases by source port: - 13579: - GET without body, plain res body (CD, only) - 13578: - GET without body, plain res body (CDEF, prefix) - 24680: - POST plain req body (AB, only), plain res body (CD, only) - 24681: - POST plain req body (ABCD, prefix), plain res body (CDEF, prefix) - 24682: - POST gzipped req body (AB, only), gzipped res body (CD, only) - POST plain req body (CD, only), plain res body (EF, only) - 33210: - POST multipart plain req body (AB;CD;EF, prefix) - plain res body (CD, only) - 33211: - POST multipart plain req body (ABCD;EF, prefix) - plain res body (CDEF, prefix) - 34527: - POST chunked gzipped req body (AB, only) - chunked gzipped res body (CD, only) - 34528: - POST chunked gzipped req body (ABCD, prefix) - chunked gzipped res body (CDEF, prefix) The tests with source ports 24680, 24682 and 34527 should match the signature http_request_body_AB_only and the signature http_request_body_AB_prefix, but they only match the latter. The tests with source ports 13579, 24680, 24682, 33210 and 34527 should match the signature http_response_body_CD_only and the signature http_response_body_CD_prefix, but they only match the latter. The tests with source ports 24680, 24681, 33210 and 33211 show how the http_request_body_AB_then_CD signature with two http-request-body conditions match either on one or multiple requests (documented behaviour). The test cases with other source ports show where the http_request_body_AB_only and http_response_body_CD_only signatures should not match because their bodies include more than the searched patterns.
43 lines
1.1 KiB
Text
43 lines
1.1 KiB
Text
# @TEST-EXEC: zeek -b -r $TRACES/http/http-body-match.pcap %INPUT | sort >out
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# @TEST-EXEC: btest-diff out
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@load-sigs test.sig
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@load base/protocols/http
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@TEST-START-FILE test.sig
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signature http_request_body_AB_prefix {
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http-request-body /^AB/
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event "HTTP request body starting with AB"
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}
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signature http_request_body_AB_only {
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http-request-body /^AB$/
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event "HTTP request body containing AB only"
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}
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signature http_request_body_AB_then_CD {
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http-request-body /AB/
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http-request-body /CD/
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event "HTTP request body containing AB and CD, but maybe not be on same request (documented behaviour)"
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}
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signature http_response_body_CD_prefix {
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http-reply-body /^CD/
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event "HTTP response body starting with CD"
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}
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signature http_response_body_CD_only {
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http-reply-body /^CD$/
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event "HTTP response body containing CD only"
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}
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@TEST-END-FILE
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event signature_match(state: signature_state, msg: string, data: string)
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{
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print(fmt("HTTP body match for %s:%d -> %s:%d with signature '%s', data: '%s'",
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state$conn$id$orig_h, state$conn$id$orig_p,
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state$conn$id$resp_h, state$conn$id$resp_p,
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state$sig_id,
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data
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));
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}
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