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Various minor changes related to file mime type detection.

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- Improve or just remove some file magic signatures ported from libmagic
  that were too general and matched incorrectly too often.

- Fix MHR script's use of fa_file$mime_type before checking if it's
  initialized.  It may be uninitialized if no signatures match.

- The "fa_file" record now contains a "mime_types" field that contains
  all magic signatures that matched the file content (where the
  "mime_type" field is just a shortcut for the strongest match).
This commit is contained in:
Jon Siwek 2014-03-06 11:41:10 -06:00
parent 0865b152bb
commit 095a68b2ec
15 changed files with 187 additions and 143 deletions
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9
scripts/base/frameworks/files/main.bro
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@ -65,10 +65,11 @@ export {
## A set of analysis types done during the file analysis.
analyzers: set[string] &log;
## A mime type provided by libmagic against the *bof_buffer*
## field of :bro:see:`fa_file`, or in the cases where no
## buffering of the beginning of file occurs, an initial
## guess of the mime type based on the first data seen.
## A mime type provided by the strongest file magic signature
## match against the *bof_buffer* field of :bro:see:`fa_file`,
## or in the cases where no buffering of the beginning of file
## occurs, an initial guess of the mime type based on the first
## data seen.
mime_type: string &log &optional;
## A filename for the file if one is available from the source