Free complete protection against viruses software for linux

Openprotect is our set of e-mail filters bundle consisting of Kaspersky Antivirus, Clam Antivirus, SpamAssassinand MailScanner along with our Qmail module.
Enhancements:
- MailScanner was updated to version 4.46.2 with an improved phishing net for JavaScript.
- A highlight Phishing fraud option was added along with the ability to quarantine all mail that has been modified and a Scan Messages option to completely disable processing of a particular mail address.
- ClamAV was updated to 0.87 and SpamAssassin(SA) was updated to 3.1.0 with many plugins and MCP patches for better spam/MCP filtering.
- A openprotect-test utility that sends test virus, spam, and clean mail to verify the setup was added along with openprotect-renew, which installs a KAV license and views expiry status.
- razor 2.77 with various bugfixes was included.

HAVP (HTTP Antivirus Proxy) is a proxy with a ClamAV anti-virus scanner. HTTP Anti Virus Proxy aims are continuous, non-blocking downloads and smooth scanning of dynamic and password protected HTTP traffic.
Havp antivirus proxy has a parent and transparent proxy mode. It can be used with squid or standalone.
Main features:
- HTTP Antivirus proxy
- Scans complete incomming traffic
- Nonblocking downloads
- Smooth scanning of dynamic and password protected traffic
- Can used with squid or other proxy
- Parent proxy support
- Transparent proxy support
- Logfile
- Process change to defined user and group
- Daemon
- Use Clamav (GPL antivirus)
- Operating System: Linux
- Written in C++
- Released under GPL
Enhancements:
- Experimental support was added for chunked Transfer-Encoding, which fixes some broken sites.
- The IGNOREVIRUS configuration directive was added for whitelisting virus names.
- The CLAMBLOCKBROKEN configuration directive was added.
- Detection with AVG was improved.
- HAVP is killed if database reloading fails for Library Scanner.
- The URL is logged when a crashed scanner process is detected.
- The build system updated, adding the --prefix, --sbindir, --sysconfdir, and --localstatedir options.

Viralator is a Perl script that virus scans HTTP/FTP downloads request on a UNIX server after passing through the Squid proxy server.
Even when I implemented virus protection for my network email server we still continued to get the odd virus. Most of the viruses came from people using free webmail accounts like Hotmail or Yahoo and downloading the infected attachments to their machines or through downloading junk.
Rather than block access to the users I decided to look at how we could better protect the network. I looked at a couple of different products both comercial and free but they were either too expensive or did not meet my needs.
That is how Viralator was born. Viralator Proxy Virus Scanner is licenced under the GPL.
Viralator should work in any UNIX system that uses Apache and Squid servers. We have reports about successful instalations on:
- RedHat Linux
- Mandrake Linux
- SuSe Linux
- e-Smith Linux
- Slackware Linux
- Conectiva Linux
- Debian Gnu Linux
Supported Redirectors:
- Squirm
- SquidGuard
- Jesred
Supported Virus Scanners
- AntiVir
- AVP
- RAV
- Inoculate
- Sophos Sweep
- McAfee
- Trend
- Clamav
- Bit Defender (free edition)
The original concept for Viralator came from the Viromat project. Without Viromat the Viralator project would not have had a starting point. We can also thank Ralph Meyer for badgering me into releasing the script under the GPL.
Enhancements:
- Parenthesis are included on the regular expression used to validate URLs.
- The character set checking step, which was not working before last patch released, has been fixed.

CGI::Application::Plugin::RateLimit is a plugin for CGI::Application which provides protection against a user calling a runmode too frequently. A typical use-case might be a contact form that sends email.

Youd like to allow your users to send you messages, but thousands of messages from a single user in a short period of time would be a problem.

Installation:

To install this module type the following:

perl Makefile.PL
make
make test
make install

protector scans e-mail attachments in order to identify those that could (by nature of their type) contain viruses or other undesirable content, and replaces them with a warning message. Protector is designed to be used on a unix mail gateway server MS Windows clients by way of a POP3 service. Typically, protector blocks DOS or Windows executables, DLLS etc Files with double extensions like "picture.gif.exe" Visual basic (VB) scripts Word documents that contain macros unrecognised file types ... etc ...

Protector is NOT a virus scanner in the traditional sense: It does NOT scan attachments for virus signatures, but blocks or edits attachments that could contain viruses. So *.exe, *.vba etc attachments dont get through. This means that you dont 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 a set of listed types.

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.

Protector grew out of a need to protect a small network that I manage in my spare time from the dangers of e-mail borne viruses and trojans. A number of installations exist round the world and feed back from users has allowed me to improve the system - in terms of reliability, performance, ease of use and the breadth of file types "allowed through". Development is still underway, and a new release will be available shortly that allows a far larger set of file types through, allows scripts to be removed from attachments (eg: JavaScript can be removed from HTML files), and is significantly easier to tailor.

Constructive critisism is warmly invited

Bypass Proxy Client is the complete network privacy tool. It ensures absolute privacy wherever you maybe, preventing would-be snoopers from monitoring your surfing, email, or chatting activity. You can bypass blocking filters, firewalls, and proxies. Surf, chat, read news boards, and get all your email at work, on campus (or in regions/areas that may block controversial websites).
Main features:
- Surf the internet using your own virtual network across the web.
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- Anonymously surf news groups, chat rooms, and web sites!
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- Protect your Kazaa Identity; Guard against IP tracing -- the no. 1 method
- used by the RIAA to spy on users of file shares (Kazaa, BearShare, etc.)
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- Prevent corporate networks from eavesdropping and viewing your personal information!
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- Keep your email and other personal documents private.
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- Regain access to sites that were previously blocked or filtered. Chat with friends online without concerns about eavesdropping.

About AVG Anti-Virus:

• AVG Professional Single Edition is perfectly designed to give you the maximum antivirus protection for your single home PC or workstation.
• It is simple to install and operate. No IT expertise is required and it can run in the background, providing uninterrupted protection. All file and e-mail activity is checked automatically, allowing you to get on with your work without worrying about viruses.
• It is extremely fast, reliable and light on resources, so, no matter how demanding a user you are, it will not slow down your performance.

Enhancements: Added detection of new variants of trojans SHeur2.ANNO, BackDoor.Hupigon5.LCW, SHeur2.ANOR, Downloader.Generic8.AXOI, PSW.Banker5.ONF, Generic13.BPUS.

POP3 Virus Scanner Proxy is a full-transparent proxy daemon which scans all mails for viruses using third party scanners (built-in support for AVPD and Trophie).

You have to set up a port redirection in the linux-netfilter (iptables) so that all connections from e.g. inside your office to any POP3 server outside in the world will not leave your router, but come a local port, on which POP3VScan listens. POP3VScan receives from the linux kernel the original destinations of packets (the POP3 server outside in the world) and will connect to them.

All data we receive from the client will be sent to the server, and vice versa. With a little enhancement: we parse the neccessary parts of the POP3 protocol and when an email is sent from the server, we store it into a file, invoke a virusscanner and send it if it is good, or we just replace it with a virus notification. It should be possible to use all scanners using the scannertype=basic. Also POP3VScan provides scannertype=avpd for high-speed scanning using Kaspersky Anti-Virus for Linux, every C programmer can easily adept other scan-daemons (trophie, sophie, antivir, ...).

Neither the client nor the server has to be configured, none of them will take notice that theres a mailscanner (except the client when he gets a virus notification or if he looks into the header, and the server gets our ip as source).