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构建邮件服务器病毒防护系统

构建邮件服务器病毒防护系统

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
本文来自: 站长网(www.admin5.com) 详细出处参考:http://www.admin5.com/article/20070331/39100.shtml
 

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