[Bro-Dev] [JIRA] (BIT-1235) HTTP multipart POST request alters file contents

Brian O'Berry (JIRA) jira at bro-tracker.atlassian.net
Sun Aug 24 12:01:07 PDT 2014

Brian O'Berry created BIT-1235:

             Summary: HTTP multipart POST request alters file contents
                 Key: BIT-1235
                 URL: https://bro-tracker.atlassian.net/browse/BIT-1235
             Project: Bro Issue Tracker
          Issue Type: Problem
          Components: Bro
    Affects Versions: 2.3
         Environment: CentOS 6.5, file extract analyzer
            Reporter: Brian O'Berry
         Attachments: bro-2.3-HTTP.patch, gdb.log, upload-api-http.pcap

HTTP POST multipart processing converts bare CR or LF chars to CRLF pairs, corrupting most files when extracted with Files::ANALYZER_EXTRACT.  This is clear in the attached gdb.log, which has a backtrace that shows a buffer with the start of a PDF file entering MIME/HTTP entity processing at frame 25, and emerging with LF chars converted to CRLF at frame 6.

Also attached are the pcap file associated with the backtrace, and an initial patch that we've barely begun to test.  A point of concern with the patch is that it changes a weird.log entry from "line_terminated_with_single_CR" to "http_no_crlf_in_header_list".  It does enable Files::ANALYZER_EXTRACT to correctly extract the PDF file from the attached pcap.

Please let me know if we can provide anything else to help with this.

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