构建邮件服务器病毒防护系统[1]

[入库:2005年9月21日] [更新:2007年3月24日]

本文简介:

  最近病毒比较猖獗,只好给公司的邮件服务器加个病毒扫描,综合考虑了几种方案,结合自己的现有系统考虑,认为qmail-scanner+clamav(主要是因为免费)比较合适,这种方案的优点就是如果你的qmailqueue-patch在安装时就打好了(不会没打吧),原系统基本不动。所需软件(假定你有QMAIL系统,且能正常运行) :

  1)maildrop-1.5.2.20030423.tar.gz
  2)perl-Time-HiRes-1.38-3.i386.rpm
  3)clamav-0.65.tar.gz
  4)qmail-scanner-1.20.tgz

  一、maildrop安装

tar zxvf maildrop-1.5.2.20030423.tar.gz
./configure [options]
  make
  make install-strip
  make install-man

  二、安装 perl-Time-HiRes-1.38-3.i386.rpm

  rpm -ivh perl-Time-HiRes-1.38-3.i386.rpm

  三、安装clamav-0.65.tar.gz

grouadd clamav
useradd –g clamav –s /bin/false clamav
tar zxvf clamav-0.65.tar.gz
cd clamav-0.65
./configure
make check
make install

  更新病毒库,freshclam

  把freshclam加入crontab 定时更新病毒库;

  修改/usr/local/etc/clamav.conf;

  Example前加# 或删掉;

  执行clamscan 测试;

  执行clamd; 

  然后执行clamdscan。 

  四、安装qmail-scanner-1.20.tgz 

groupadd qscand
useradd –g qscand –s /bin/false qscand
tar zxvf qmail-scanner-1.20.tgz
cd qmail-scanner-1.20
./configure --qmail-queue-binary /var /qmail/bin/qmail-queue --admin postmaster \
--domain abc.com.cn --notify sender,admin --local-domains abc.com.cn --lang en_GB\
--debug yes --unzip yes --scanners clamscan 
检查有无错误,
然后安装./configure --qmail-queue-binary /var /qmail/bin/qmail-queue --admin postmaster \
--domain abc.com.cn --notify sender,admin --local-domains abc.com.cn --lang en_GB\
--debug yes --unzip yes --scanners clamscan --install

  看看是否在/var/qmail/bin/qmail-scanner-queue.pl是否存在:

chown qscand:qscand /var/qmail/bin/qmail-scanner-queue.pl
chmod 4755 /var/qmail/bin/qmail-scanner-queue.pl

  然后用一个普通用户登陆,执行/var/qmail/bin/qmail-scanner-queue.pl -z

  如果没有Can't do setuid出现,恭喜你,如果有回到安装文件目录,有个contrib目录。

  make 
  make install

  附加步骤:

  chown qscand:qscand /var/qmail/bin/qmail-scanner-queue
  chmod 4755 /var/qmail/bin/qmail-scanner-queue
  chmod 0755 /var/qmail/bin/qmail-scanner-queue.pl

  然后用一个普通用户登陆,执行/var/qmail/bin/qmail-scanner-queue -z
/var/qmail/bin/qmail-scanner-queue –g

  修改环境变量:

  1、在你的qmail启动脚本加入

QMAILQUEUE=/var/qmail/bin/qmail-scanner-queue.pl如果作了附加步骤用下面的:
QMAILQUEUE=/var/qmail/bin/qmail-scanner-queue
export QMAILQUEUE

  2、还有一种方法:请参考FAQ.php

Instead set it under the tcpserver smtp rules file (you're using Qmail - so you already know what that is - right? :-). That way you can even setup Qmail-Scanner to only scan mail from particular SMTP client IP address ranges/etc. This is now the only officially supported mechanism. Set it something like this:
#/etc/tcpserver/smtp.rules
#
# No Qmail-Scanner at all for mail from 127.0.0.1
127.:allow,RELAYCLIENT="",RBLSMTPD="",QMAILQUEUE="/var/qmail/bin/qmail-queue"
# Use Qmail-Scanner without SpamAssassin on any mail from the local network
# [it triggers SpamAssassin via the presence of the RELAYCLIENT var]
10.:allow,RELAYCLIENT="",RBLSMTPD="",QMAILQUEUE="/var/qmail/bin/qmail-scanner-queue.pl"
#
# Use Qmail-Scanner with SpamAssassin on any mail from the rest of the world
:allow,QMAILQUEUE="/var/qmail/bin/qmail-scanner-queue.pl"
Then run "maketcprules" or something like "tcprules /etc/tcp.smtp.cdb /etc/tcp.smtp.tmp < /etc/tcp.smtp" to rebuild the database

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