Secure Computing SSL Scanner - Manual (Page 158)

Common
The media type tells the application that receives the data what kind of appli-
cation is needed to process the content, e. g. Real Audio is to play the audio
content for a user.
Each of these media types also have subtypes, e. g. the text media type has
four subtypes: plain, rich text, enriched, and tab-separated values.
You can also specify how a media type should be recognized by the particular
magic byte sequences of the files belonging to it.
To add a media type to the catalog, use the area labeled:
•
Add or modify Media Type
In the upmost input field provided here, enter the media type you want to
add to the catalog.
Furthermore, use the following items when adding a media type to the cat-
alog:
—
File Extensions
In the input fields provided here, specify up to three extensions that
files of the media type in question may have. So, e. g. the media type
image/jpeg
can have
jpg
or
jpeg
as extensions.
—
Options
Configure the following options by marking the checkboxes provided
for each of them:
– Magic bytes are necessary
If this option is enabled, a file that does not match the magic bytes
sequences specified for its media type will be affected by the action,
e. g.
Block
, configured for the Media Type Filter.
The corresponding setting is labeled
Non-rectifiable media
types with magic bytes mismatch
and can be configured in
the
Media Type Filter
section of the
Actions
tab under
Common
> Media Type Filters
.
– Magic bytes are ambiguous
If this option is enabled, a file that does not match the magic bytes
sequences specified for its media type will be affected by the action,
e. g.
Block
, configured for the Media Type Filter.
It will, however, not be affected if several magic byte sequence were
specified and one of them matches.
For the corresponding setting, see the description of the
Magic
bytes are necessary
option above.
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