Virus Protection for GroupWise
Articles and Tips: article
01 Feb 2002
A complete virus-protection solution must cover all entry points of your company's network. The most likely entry and propagation points are listed below. (For this article, we assume that your company is using GroupWise. If your company is using Microsoft Exchange or another groupware solution, you will need to identify the entry points for that solution.)
Software or web pages that users access on the Internet
Removable media (such as disks or CDs)
Files attached to an e-mail message that users access with the GroupWise 32-bit client
GroupWise WebAccess client
To effectively eradicate viruses that propagate via the first two entry points, you must use a combination of workstation- and server-based virus-protection software. If you are not already running virus-protection software on all of your company's servers and workstations, you should make plans to purchase this software now. When making your purchasing decision, you should factor in your company's GroupWise system. (For more information, see "Workstation- and Server-Based Virus-Protection Software and Its Relationship to GroupWise.")
To effectively eradicate viruses that propagate via the GroupWise entry points, you should follow the guidelines outlined in this article.
PROTECTING THE POST OFFICE AGENT (POA)
Currently, no virus-protection software is available for the GroupWise POA. If you are not running virus-protection software on workstations, users can propagate viruses through e-mail to other users in the GroupWise system.
PROTECTING THE MESSAGE TRANSFER AGENT (MTA)
Beginfinite (http://www.beginfinite.com/) offers GWAVA (GroupWise Anti-Virus Agent) virus-protection software for the GroupWise MTA. GWAVA integrates with most existing server-based virus-protection software.
GWAVA is a NetWare Loadable Module (NLM) that works in conjunction with the GroupWise MTA. Because GWAVA protects the GroupWise MTA, GWAVA prevents users from sending viruses to users in other post offices. We have implemented GWAVA at customers' sites and have been surprised at the results. For example, Tay recently implemented GWAVA for a customer and found that GWAVA filtered 5,600 instances of a virus in a two-hour period.
PROTECTING THE GROUPWISE INTERNET AGENT (GWIA)
As you know only too well, Internet-propagated e-mail viruses are the biggest threat to your company's network. The best way to stop these viruses is at the entry point from the Internet. The GWIA is a common entry point into your GroupWise system.
Virus protection providers usually take one of the following approaches to providing virus-protection software for e-mail:
Virus protection at the MTA for the GWIA's domain
GWIA third-party queue integration
Simple Mail Transfer Protocol (SMTP) mail hosting with a virus scanner
Protecting the MTA for the GWIA's Domain
GWAVA is one example of a product that protects the MTA for the GWIA's domain. The GWAVA agent takes messages that are sent to the GWIA's domain and submits them to server-based virus-protection software. After the virus-protection software scans the messages for viruses, GWAVA allows the messages to be processed. What sets GWAVA apart from other virus-protection software is that it is NLM based. As a result, GWAVA is fast.
GWIA Third-Party Queue Integration
When the GWIA receives an outgoing message from the MTA, the GWIA converts the message into ASCII format. The GWIA then typically spools these files to its internal SMTP daemon.
You can configure the GWIA to spool these files to another directory, which becomes a third-party integration queue. You can then have the virus-protection software scan the files in this queue for viruses. The virus-protection software must then move the files to an input directory for the GWIA.
Many virus-protection products are written to work in this way for most e-mail systems. For example, you may want to check out the following products:
Integralis Inc.'s MIME sweeper (http://www.integralis.com/)
Network Associates Inc.'s WebShield (http://www.networkassociates.com/)
Symantec Corp.'s Norton AntiVirus for Internet E-mail Gateways (NAVIEG) (http://www.symantec.com/)
Trend Micro Device Inc.'s InterScan E-mail VirusWall (http://www.antivirus.com/)
Two products are specifically designed for the GWIA's third-party integration queue:
Guinevere ingeniously leverages desktop virus-protection software to scan GroupWise messages. With the GWIA's configurable third-party queue, Guinevere scans the GroupWise messages and then moves them to the input queue for the GWIA. Guinevere requires a Windows NT or Windows 2000 workstation.
Footnote is supposed to work in the same way that Guinevere works. However, neither of us have any experience with Footnote.
For more information about configuring the GWIA for these solutions, read the Technical Information Document (TID) at http://support.novell.com/cgibin/search/tidfinder.cgi?10011919.
SMTP Mail Hosting
Mail hosting means that the GWIA is not sending or receiving SMTP mail to or from Internet SMTP hosts. Instead, another SMTP device, a host, handles the SMTP mail for the GWIA.
The host receives incoming e-mail messages from the Internet. Virus-protection mail hosts scan the messages for viruses and then forward the messages to the GWIA via the SMTP protocol.
You can then configure the GWIA to relay outgoing e-mail messages to the mail host. The mail host then scans these messages for viruses before sending the messages to the Internet.
You can maintain virus-protection hosts at your site, or you can have an application service provider (ASP) provide the virus-protection host for you.
PROTECTING GROUPWISE WEBACCESS
GroupWise WebAccess changes the face of virus protection at your company's site. The biggest concern is that users working at home or at other locations outside of your control may be able to send virus-laden attachments into your company's network.
To protect against viruses spreading via the GroupWise WebAccess client, you should understand how GroupWise WebAccess works. The web-server servlets for GroupWise 5.5 Enhancement Pack and GroupWise 6 WebAccess place attachments in a directory on the file server where the web server is running. (On a NetWare server, the default location for this directory is SYS:NOVELL\WEBACCESS\TEMP.) Because the attachment files remain in their native format and are stored in this directory for a short period of time, server-based virus-protection software can continually scan this temporary directory to detect viruses.
We have one caution, however: You should understand how your virus-protection software works before you assume this software can effectively scan this temporary directory. For example, one of the Novell customers we work with has tested its server-based virus-protection software with GroupWise WebAccess. This customer found that its server-based virus-protection software did not catch viruses in the ...\TEMP directory when a virus-laden document was attached to an e-mail message.
The customer's server-based virus-protection software seemed to rely on files being placed on a server via a NetWare client. In the case of GroupWise WebAccess and a web server, a file does not pass through a NetWare client.
The Novell customer then tested Computer Associate's InnoculateIT 4.5 for NetWare, which was able to detect viruses sent via the GroupWise WebAccess client. This customer observed the following: If a user uploaded several files and one of the files contained a virus, the file with the virus never got through. The customer noticed, however, that the other files that were uploaded with the message may or may not have gotten through to the recipient. That's not so good, but, hey, at least the virus didn't get through!
REACTIVE SOLUTIONS FOR ELIMINATING E-MAIL VIRUSES
If a virus manages to infiltrate the GroupWise message store, you should use GWCHECK with the ITEMPURG command to eliminate the virus. The instructions for using GWCHECK and the ITEMPURG command vary, depending on which version of GroupWise you are using. If you are running GroupWise 5.5 or GroupWise 5.5 Enhancement Pack, you will find some well-written documentation about ITEMPURG at http://support.novell.com/. Search the knowledgebase for document 10052682, or simply search for ITEMPURG.
If you are running GroupWise 6, the GWCHECK interface now includes a field for special commands such as ITEMPURG. What's even better is that these special commands can be issued from ConsoleOne or the standalone GWCHECK (GWCHECK.EXE).
Note. Do not use the standalone GroupWise 6 GWCHECK on a GroupWise 5x post office. Although you can issue GWCHECK jobs on a GroupWise 5x post office from ConsoleOne, the GroupWise 5x POA ignores the features that are new to GroupWise 6.
For the fastest execution of the ITEMPURG command, you should issue the GWCHECK-Mailbox/Library maintenance job from ConsoleOne and allow the GroupWise 6 POA to perform the GWCHECK job. Highlight a GroupWise post office or user in either the GroupWise view or the eDirectory browser view, and select Tools|GroupWise Utilities|Mailbox/Library Maintenance. To run the ITEMPURG command on a post office, you should use the following commands:
Object Type: User/Resource - ALL (The field below User/Resource should read ALL, which means all users on the post office.)
Action: Analyze/Fix Databases - Contents - Fix problems
Results: Send results to - Administrator and whoever else you would like
Logging: Verbose logging
Misc tab/Support options field - As shown in Figure 1, use the syntax: itempurg=<exact text that distinguishes the virus; specify only the first 27 characters>
Note. The matching algorithm works from left to right and does not match portions in the middle of the string or at the end of the string. The algorithm looks for matches starting with the left-most part through the first 27 characters of the string. Spaces in the string also count. The matching algorithm is not case sensitive.
For example, suppose you want to purge messages with "ILOVEYOU" in the subject line. Both of the following show the correct syntax for the Support options field in the ITEMPURG command:
If the subject line includes other text such as "Fw: ILOVEYOU" or "Re: ILOVE YOU," you must issue a separate GWCHECK/ITEMPURG job. In this case, the Support options field should read as follows:
You then click the Run button. If you are running GWCHECK from ConsoleOne, the Mailbox/Library Maintenance-GWCHECK job is sent to the POA to perform. If you are running the standalone GWCHECK, the Mailbox/Library Maintenance-GWCHECK job executes at the workstation.
GWCHECK creates a log. If GWCHECK finds anything that matched the ITEMPURG command you specified, the log includes text similar to the following:
1 FOLDER_RECORD (Universal Inbox)
282 ITEM_RECORD check
- Item matches subject "ILOVEYOU"
- Item 282 purged successfully
Problem 87- Special Cleanup
Successfully deleted: "ILOVEYOU"
If GWCHECK does not find anything that matches the ITEMPURG command you specified, the log does not contain any evidence that you even issued this command.
Tip. You can make the GWCHECK job run even faster by using the PABSKIP command before the ITEMPURG command. If you use the PABSKIP command, GWCHECK will not check users' personal address books as it usually does when running a contents check and fix. To include the PABSKIP command, use the following syntax in the Support options field:
Virus threats are expected to get even worse in the future. Although GroupWise isn't impacted by viruses nearly as much as Microsoft Outlook and Exchange, you still need to implement a proactive virus protection solution for your company's GroupWise system. With the heavy proliferation of the Outlook client and its ability to access MAPI-compliant messaging systems, such as GroupWise, viruses that are propagated from within your GroupWise system are far more likely than they were in the past.
Tay Kratzer is author of Novell's GroupWise 6 Administrator's Guide published by Novell Press and is the coauthor of the GroupWise 6 Upgrade Guide published by Caledonia Network Press. Both books are available at http://www.caledonia.net/.
Danita Zanrč has been using GroupWise since 1989, when its predecessor was known as WordPerfect Office 2.0. She is experienced in all aspects of GroupWise, from design and installation to training. Danita is one of the primary consultants responsible for the day-to-day operations of Caledonia Network Consulting and is the coauthor of the GroupWise 5.2 Administrator's Guide, GroupWise 5.5 Administrator's Guide, and GroupWise 6 Upgrade Guide. (For more information, visit http://www.caledonia.net/.) Danita is also a sysop on the Novell Support Connection (http://support.novell.com/).
Workstation- and Server-Based Virus-Protection Software and Its Relationship to GroupWise
Because a complete virus-protection solution guards all of the entry points into your company's network, you should understand how workstation- and server-based virus-protection solutions affect how you protect GroupWise. In particular, you should keep in mind the following:
WORKSTATION-BASED VIRUS SCANNING
You need a workstation virus-protection solution, whether or not your company has e-mail.
If a user uses the GroupWise viewing feature to view a document, then a document-born virus cannot infect the workstation. To trigger the virus infection, the user must open the document in its native application. If the user uses the GroupWise viewing feature, GroupWise copies the file in its native format to the workstation's TEMP directory. If memory-resident virus-protection software is running on the workstation, it will detect the virus-infected document.
Virus-protection software at the workstation can consume a lot of resources. Virus-protection software interacts with the operating system so that it can scan every file that is read from or written to the disk. Virus-protection software even catches information that passes through memory.
That's a lot of scanning! If a workstation is low on memory, it may use the hard drive to create virtual memory. Virus-protection software will really bog down workstations that have to frequently swap to disk for memory. Our advice is to ensure that workstations have sufficient memory and speed to run virus-protection software.
SERVER-BASED VIRUS SCANNING
Running virus-protection software on the server is a good safety measure. However, virus-protection software on the server cannot replace virus-protection software on workstations.
Server-based virus-protection solutions should not scan the GroupWise post offices and GroupWise domains (with the exception of the GWAVA product mentioned in the main article). The GroupWise message store is encrypted, and encryption renders virus-protection software useless. In fact, some virus-protection software is so limited that when a file is zipped, virus-protection software cannot detect a virus. If you have set up server-based virus-protection software to scan GroupWise, you cause needless processor overhead because this software is scanning files in which it can't possibly detect viruses.
* Originally published in Novell Connection Magazine
The origin of this information may be internal or external to Novell. While Novell makes all reasonable efforts to verify this information, Novell does not make explicit or implied claims to its validity.