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%META:TOPICINFO{author="chris.lowth" date="1026996000" format="1.0" version="1.1"}%
Update 6 of protector 1.00 has been released for RedHat GNU-Linux versions
6.0, 6.1, 6.2, 7.0, 7.1, 7.2 and 7.3 systems, and as an "beta" testing release for
Sun Solaris.
This update of the protector software ..
- Corrects the "bad filename" testing logic for mails in which attachment names are encoded in the Content-Disposition header only.
Version 1.01 is also now available as a development beta release, for testing and documentation. This reworked protector release handles MS office and other document formats more intellegently - including the checking of embedded objects but is currently still under development..
For information and download of both versions, visit: http://protector.sourceforge.net/
Protector checks incoming e-mail messages for attachments that could contain
viruses, worms etc - and replaces the offending attachments with standard
warning messages before being passed to "procmail" for local delivery. The
original "dangerous" attachment is saved in a directory that only the root
user can access.
Protector is NOT a virus scanner in the traditional sense: It does NOT scan
attachments for virus signatures, but blocks attachments that could contain
viruses. So *.exe, *.vba etc attachments don't get through. This means that
you don't have to keep protector up to date to stay protected against the
growing tide of new viruses and worms.
Protector does not work by blocking listed types, but by blocking ALL BUT the
listed types. For details of the attachment types "allowed through", please
refer to the web site.
The logic employed by protector to determine the file types contained in
attachments is based on a modified version of the "file" command, and a
number of type-specific validation programs - it does not rely on the actual
name of the file, or the "content-type" declared in the attachment header. It
also looks inside ZIP, TAR and other archive formats, and checks the files
contained in them.
Some types of files are allowed through only under certain conditions. The
main example being that MS Word documents are blocked if they contain ANY
macros, but allowed through otherwise.
It isn't perfect yet, but it's a start. Assistance in developing the checking
logic for new file types is invited.
Chris |