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http: Heuristic around rejecting malformed HTTP/0.9 traffic

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oss-fuzz generated "HTTP traffic" containing 250k+ sequences of "T<space>\r\r"
which Zeek then logged as individual HTTP requests. Add a heuristic to bail
on such request lines. It's a bit specific to the test case, but should work.

There are more issues around handling HTTP/0.9, e.g. triggering
"not a http reply line" when HTTP/0.9 never had such a thing, but
I don't think that's worth fixing up.

Fixes #119
This commit is contained in:
Arne Welzel 2022-11-18 14:45:18 +01:00
parent ee8e2decec
commit 540fe7aff7
8 changed files with 62 additions and 0 deletions
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11
testing/btest/Baseline/scripts.base.protocols.http.curl-http-09/http.log Normal file
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### BTest baseline data generated by btest-diff. Do not edit. Use "btest -U/-u" to update. Requires BTest >= 0.63.
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path http
#open XXXX-XX-XX-XX-XX-XX
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p trans_depth method host uri referrer version user_agent origin request_body_len response_body_len status_code status_msg info_code info_msg tags username password proxied orig_fuids orig_filenames orig_mime_types resp_fuids resp_filenames resp_mime_types
#types time string addr port addr port count string string string string string string string count count count string count string set[enum] string string set[string] vector[string] vector[string] vector[string] vector[string] vector[string] vector[string]
XXXXXXXXXX.XXXXXX CHhAvVGS1DHFjwGM9 127.0.0.1 49404 127.0.0.1 80 1 GET localhost /zeek.html - - curl/7.74.0 - 0 0 - - - - (empty) - - - - - - - - -
#close XXXX-XX-XX-XX-XX-XX