Secure Computing SSL Scanner User Manual download pdf (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:

–Magicbytesarenecessary

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 c onfigured in

the Media Type Filter section of the Actions tab under Common

> Media Type Filters.

–Magicbytesareambiguous

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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Secure Computing SSL Scanner User Manual Page 158