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68 lines
1.5 KiB
Text
68 lines
1.5 KiB
Text
##! Calculate hashes for HTTP body transfers.
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@load ./main
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@load ./file-analysis
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module HTTP;
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export {
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redef record Info += {
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## MD5 sum for a file transferred over HTTP calculated from the
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## response body.
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md5: string &log &optional;
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## This value can be set per-transfer to determine per request
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## if a file should have an MD5 sum generated. It must be
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## set to T at the time of or before the first chunk of body data.
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calc_md5: bool &default=F;
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};
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## Generate MD5 sums for these filetypes.
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const generate_md5 = /application\/x-dosexec/ # Windows and DOS executables
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| /application\/x-executable/ # *NIX executable binary
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&redef;
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}
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event file_new(f: fa_file) &priority=5
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{
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if ( ! f?$source ) return;
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if ( f$source != "HTTP" ) return;
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if ( f?$mime_type && generate_md5 in f$mime_type )
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{
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FileAnalysis::add_analyzer(f, [$tag=FileAnalysis::ANALYZER_MD5]);
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return;
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}
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if ( ! f?$conns ) return;
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for ( cid in f$conns )
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{
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local c: connection = f$conns[cid];
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if ( ! c?$http ) next;
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if ( ! c$http$calc_md5 ) next;
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FileAnalysis::add_analyzer(f, [$tag=FileAnalysis::ANALYZER_MD5]);
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return;
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}
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}
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event file_state_remove(f: fa_file) &priority=4
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{
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if ( ! f?$source ) return;
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if ( f$source != "HTTP" ) return;
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if ( ! f?$conns ) return;
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if ( ! f?$info ) return;
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if ( ! f$info?$md5 ) return;
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for ( cid in f$conns )
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{
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local c: connection = f$conns[cid];
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if ( ! c?$http ) next;
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c$http$md5 = f$info$md5;
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}
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}
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