服务器 频道

建设qmail服务器的病毒防护系统

  【IT168 服务器学院】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

  重起qmail 测试,这里有测试程序
  /youdir/software/qmail-scanner-1.20 test_installation.sh

  不知什么原因,我的clamscan 扫描不到病毒,经过测试,发现了原因,正确解决方法: 

  修改qmail-scanner-queue.pl中的 
  my $clamscan_options="-r --disable-summary --max-recursion=10 --max-space=1000000";为 
  my $clamscan_options="-r --mbox --disable-summary --max-recursion=10 --max-space=1000000"; 
  就可以OK了

  主要的排错监测日志
  /var/spool/qmailscan/quarantine.log
  /var/spool/qmailscan/qmail-queue.log
   /var/log/clamd.log
  /var/qmail/maillog

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