After-queue integration by rerouting

When "after-queue" integration is used and messages are rerouted to Kaspersky Security 8 for Linux Mail Server for scanning and then returned to the Exim mail server, the following conditions must be satisfied:

• The filter must be configured to intercept messages from the Exim mail server via socket-in. This socket must be specified in the configuration of the program.
• The filter must forward messages to Scan Logic for scanning via the scanner socket. This socket must be specified in the configuration of the program.
• The filter must return messages to the Exim mail server via socket-out. This socket must be specified in the configuration of the program.

When after-queue integration with the Exim mail server is used for rerouting, socket-in, scanner, and socket-out must point to a network socket.

Depending upon the specific distribution of the operating system, you have to modify one or several configuration files of the Exim mail server. For example, in Debian and Ubuntu, the Exim mail server configuration may consist of several files in the /etc/exim/conf.d directory or a single file only.

To perform after-queue integration of Kaspersky Security 8 for Linux Mail Server with Exim by rerouting:

1. Make a backup copy of the Exim configuration file (files).
2. In the [routers] section of Exim configuration file(s), add after the line

   begin routers

   add the following lines:

   #klms-filter-begin-2

   klms_dnslookup:

   driver = dnslookup

   domains = ! +local_domains

   ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8

   verify_only

   pass_router = smtp_proxy

   no_more

    

   klms_system_aliases:

   driver = redirect

   allow_fail

   allow_defer

   data =${lookup{$local_part}lsearch{/etc/aliases}}

   verify_only

   pass_router = smtp_proxy

    

   klms_localuser:

   driver = accept

   check_local_user

   verify_only

   pass_router = smtp_proxy

   cannot_route_message = Unknown user

    

   failed_address_router:

   driver = redirect

   verify_only

   condition = "{0}"

   allow_fail

   data = :fail: Failed to deliver to address

   no_more

    

   smtp_proxy:

   driver = manualroute

   condition = "${if or {{eq {$interface_port}{$forward_port}} \\

   {eq {\$received_protocol}{spam-scanned}} \\

   }{0}{1}}"

   transport = smtp_proxy

   route_list = "* localhost byname"

   self = send

   #klms-filter-end-2

   where $forward_port is the port number of the socket to which the message will sent after being scanned by Kaspersky Security 8 for Linux Mail Server.

3. In the [transports] section of Exim configuration file(s), add after the line

   begin transports

   add the following lines:

   #klms-filter-begin-3

   smtp_proxy:

   driver = smtp

   port = $scanner_port

   delay_after_cutoff = false

   allow_localhost

   #klms-filter-end-3

   where $scanner_port stands for the port, which filter uses to wait for messages.

4. In the main Exim configuration file (exim.conf or update-exim.conf.conf), specify the substring in the form 127.0.0.1.$forward_port as follows:

   dc_local_interfaces=<IP adress1>.<port1>:127.0.0.1.$forward_port

   or

   local_interfaces=<IP address1>.<port1>:127.0.0.1.$forward_port

   where the 127.0.0.1.$forward_port substring is required to enable the Exim mail server to accept processed messages from the filter and listen for data on $forward_port.

5. Compile the Exim configuration file (files) according to your operating system settings.
6. Open the file /var/opt/kaspersky/klms/installer.dat (under Linux) or /var/db/kaspersky/klms/installer.dat (under FreeBSD).
7. Add the following lines to the file:

   EXIM_INTEGRATION_TYPE= after-queue

   START_SMTP_PROXY=1

8. Open the file /etc/opt/kaspersky/klms/klms_filters.conf (under Linux) or /usr/local/etc/kaspersky/klms/klms_filters.conf (under FreeBSD).
9. In the [smtp_proxy] section, specify the following settings:

   socket-in=inet:$scanner_port@127.0.0.1

   socket-out=inet: $forward_port@127.0.0.1

10. Set the true value in the [global] section for theheader-guard setting.
11. Restart the klms service.
12. Restart Exim mail server.

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