emos 安装后的安全设置
        这几天一直有学习postfix邮件系统,在extmail论坛里发现了EMOS1.3这个系统,决定自己试装下,安装过程比较傻瓜,整个系统也比较好用,就是软件包版本太低,希望软件作者能推出最新版本的EMOS,在此也非常感谢EMOS的作者.
        装完EMOS1.3后,对这个系统做了一番设置,具体设置如下:(里面的有些脚借鉴了sery大哥的,在此也表示感谢!!)
#1、mysql数据库root 密码修改
     mysqladmin -u root -p password postfix
     输入原有密码(默认为空),直接回车,root 密码修改完毕
#*****************************************************************************************************
#2、mysql数据库extmail密码修改
    mysql -u root -ppostfix
     use mysql;
     SET PASSWORD FOR 'extmail'@'localhost' = PASSWORD('extmailserver');
     同时还要修改以下文件的连接字符串:
     /etc/postfix/mysql_virtual_alias_maps.cf
     /etc/postfix/mysql_virtual_domains_maps.cf
     /etc/postfix/mysql_virtual_mailbox_maps.cf
     /etc/postfix/mysql_virtual_sender_maps.cf
     /var/www/extsuite/extmail/webmail.cf
     /var/www/extsuite/extman/webman.cf
     /etc/authlib/authmysqlrc
#*****************************************************************************************************
#3、定期备份邮件数据脚本(/usr/local/bin/data_backup.sh)
mysql -u root -ppostfix
grant all on *.* to 'backup'@'localhost' identified by 'mailbackup';
flush privileges;
quit;
mkdir -p /var/data_bk/{mysqlbk,mailbk}    --创建备份文件夹
chmod +x /usr/local/bin/data_backup.sh    --添加执行权限
crontab -e
00 01 * * * /usr/local/bin/data_backup.sh       --每天凌晨1点执行备份操作

#!/bin/bash
BackupPath=/var/data_bk
Mysql_bk_dir=$BackupPath/mysqlbk
Mail_bk_dir=$BackupPath/mailbk
LogFile=$BackupPath/backuplog
MailBoxDir=/home/domains
 
####################################################################
# define mysql variables                                                     #
####################################################################
NewFile="$Mysql_bk_dir"/postfix$(date +%Y%m%d).tgz
DumpFile="$Mysql_bk_dir"/postfix$(date +%Y%m%d).sql
OldFile="$Mysql_bk_dir"/postfix$(date +%Y%m%d --date='5 days ago').tgz
DbUser=backup
DbPasswd=mail&backup
DbName=extmail
####################################################################
#   mysql backup proccess                                                 #
####################################################################
echo "-------------------------------------------" >> $LogFile
echo $(date +"%y-%m-%d %H:%M:%S") >> $LogFile
echo "--------------------------" >> $LogFile
#Delete Old File
if [ -f $OldFile ]
then
   rm -f $OldFile >> $LogFile 2>&1
   echo "[$OldFile]Delete Old File Success!" >> $LogFile
else
   echo "[$OldFile]No Old Backup File!" >> $LogFile
fi
 
if [ -f $NewFile ]
then
   echo "[$NewFile]The Backup File is exists,Can't Backup!" >> $LogFile
else
    cd $Mysql_bk_dir
/usr/local/mysql/bin/mysqldump -u $DbUser -p$DbPasswd --opt $DbName > $DumpFile
    tar czf $NewFile postfix$(date +%Y%m%d).sql >> $LogFile 2>&1
    echo "[$NewFile]Backup Success!" >> $LogFile
    rm -rf $DumpFile
fi
 
######################################################################
#     backup mail's user directories and files                                     #
######################################################################
MailFileBk=$Mail_bk_dir/mail$(date +%Y%m%d).tgz
OldMailFileBk=$Mail_bk_dir/mail$(date +%Y%m%d --date='14 days ago').tgz
 
if [ -f $OldMailFileBk ]
then
   rm -rf $OldMailFileBk
fi
 
if [  -f $MailFileBk ]
   then
   echo "[$MailFileBk]The Backup File is exists,Can't Backup!" >> $LogFile
   else
   cd /home
   tar czf $MailFileBk domains  >> $LogFile 2>&1
fi
 
echo "-------------------------------------------" >> $LogFile   
#*********************************************************************************************************8
#4、内核优化脚本(/usr/local/bin/kernel_optimize) 
chmod +x /usr/local/bin/kernel_optimize  ----添加执行权限
echo "/usr/local/bin/kernel_optimize" >> /etc/rc.local   --开机自动运行

#!/bin/bash
#kernel optimize optimize ,create by 2008-10-07
 
#enable broadcast echo protection
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
#deny ping
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
 
#disble source routed packets
#for f in /proc/sys/net/ipv4/conf/*/accept_source_rout; do
#    echo 0 > $f
#done
 
#enable tcp syn cookie protection
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
 
#disable icmp redirect acceptance
for f in /proc/sys/net/ipv4/conf/*/accept_redirects; do
    echo 0 > $f
done
 
#don't send redirect messages
for f in /proc/sys/net/ipv4/conf/*/send_redirects; do
    echo 0 > $f
done
 
#drop spoofed packets
for f in /proc/sys/net/ipv4/conf/*/rp_filter; do
    echo 1 > $f
done
 
#log packets with impossible addresses
for f in /proc/sys/net/ipv4/conf/*/log_martians; do
    echo 1 > $f
done
#********************************************************************************************************
#5、防火墙设置脚本(/usr/local/bin/firewall) 
chmod +x /usr/local/bin/firewall   ---添加执行权限 
echo "/usr/local/bin/firewall " >> /etc/rc.local   ---开机自动运行

#!/bin/bash
#this is a common firewall created by 2008-10-7
 
#define some variable
IPT=/sbin/iptables
CONNECTION_TRACKING="1"
INTERNET="eth0"
CLASS_A="10.0.0.0/8"
CLASS_B="172.16.0.0/12"
CLASS_C="192.168.0.0/16"
CLASS_D_MULTICAST="224.0.0.0/4"
CLASS_E_RESERVED_NET="240.0.0.0/5"
BROADCAST_SRC="0.0.0.0"
BROADCAST_DEST="255.255.255.255"
IPADDR=220. 94.58.245
LOOPBACK_INTERFACE="lo"
 
#Remove any existing rules
$IPT -F
$IPT -X
 
#setting default firewall policy
$IPT --policy OUTPUT ACCEPT
$IPT --policy FORWARD DROP
$IPT -P INPUT DROP
 
 
#stop firewall
if [ "$1" = "stop" ]
then
echo "Filewall completely stopped!no firewall running!"
exit 0
fi
 
#setting for loopback interface
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A OUTPUT -o lo -j ACCEPT
 
# Stealth Scans and TCP State Flags
# All of the bits are cleared
$IPT -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
# SYN and FIN are both set
$IPT -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
# SYN and RST are both set
$IPT -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
# FIN and RST are both set
$IPT -A INPUT -p tcp --tcp-flags FIN,RST FIN,RST -j DROP
# FIN is the only bit set, without the expected accompanying ACK
$IPT -A INPUT -p tcp --tcp-flags ACK,FIN FIN -j DROP
# PSH is the only bit set, without the expected accompanying ACK
$IPT -A INPUT -p tcp --tcp-flags ACK,PSH PSH -j DROP
# URG is the only bit set, without the expected accompanying ACK
$IPT -A INPUT -p tcp --tcp-flags ACK,URG URG -j DROP
 
# Using Connection State to By-pass Rule Checking
if [ "$CONNECTION_TRACKING" = "1" ]; then
    $IPT -A INPUT  -m state --state ESTABLISHED,RELATED -j ACCEPT
    $IPT -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
    $IPT -A INPUT -m state --state INVALID -j DROP
    $IPT -A OUTPUT -m state --state INVALID -j DROP
fi
 
##################################################################
# Source Address Spoofing and Other Bad Addresses
 
# Refuse spoofed packets pretending to be from
# the external interface.s IP address
$IPT -A INPUT  -i $INTERNET -s $IPADDR -j DROP
 
# Refuse packets claiming to be from a Class A private network
$IPT -A INPUT  -i $INTERNET -s $CLASS_A -j DROP
 
# Refuse packets claiming to be from a Class B private network
$IPT -A INPUT  -i $INTERNET -s $CLASS_B -j DROP
 
# Refuse packets claiming to be from a Class C private network
$IPT -A INPUT  -i $INTERNET -s $CLASS_C -j DROP
 
$IPT -A INPUT -i $INTERNET -s 0.0.0.0/8 -j DROP
$IPT -A INPUT -i $INTERNET -s 169.254.0.0/16 -j DROP
$IPT -A INPUT -i $INTERNET -s 192.0.2.0/24 -j DROP
###################################################################
#setting access rules
 
#enable ssh connect
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 22 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 25 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 80 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 110 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 143 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp -s 127.0.0.1 --dport 3306 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 10024 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 10025 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p tcp  --dport 443 -j ACCEPT
$IPT -A INPUT  -i $INTERNET -p icmp -j ACCEPT
#***********************************************************************************************************
#6、extman后台访问授权
vi /etc/httpd/conf/vhost_extmail.conf
Alias /extmail   /var/www/extsuite/extmail/html/
<Directory "/var/www/extsuite/extman/html">
    AuthType Basic
    Options None
    AllowOverride None
    Order allow,deny
    Allow from 192.168.1.3
    AuthName "Mail Server Manager"
    AuthUserFile /etc/httpd/conf/htpasswd
    Require valid-user
</Directory>
htpasswd -c /etc/httpd/conf/htpasswd kerry          --添加认证用户 
killall httpd
/etc/rc.d/init.d/httpd start