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解析OPENBSD上的ADSL和防火墙设置

偶在翻阅了大量网上文档后,实验整理了一下OPENBSD环境中ADSL、PF的配置过程。希望对OPENBSD的初学者有些帮助。下面我用的是OPENBSD 3.6

  配置ADSL:

  # vi /etc/ppp/ppp.conf

  ========================ppp.conf=======================

  default:

  set log Phase Chat IPCP CCP tun command

  set redial 15 0

  set reconnect 15 10000

  pppoe:

  set device "!/usr/sbin/pppoe -i rl1"

  disable acfcomp protocomp

  deny acfcomp

  set mtu max 1492

  set crtscts off

  set speed sync

  enable lqr

  set lqrperiod 5

  set cd 5

  set dial

  set login

  set timeout 0

  set authname "sjz681a0156@adsl2"

  set authkey 123456

  add! default HISADDR

  enable mssfixup

  ========================ppp.conf=======================

  建立防火墙代理配置:

  # vi /etc/pf.conf

  =========================pf.conf=======================

  ext_if = "tun0"

  int_if = "{ dc0, rl0 }"

  int_net = "{ 192.168.0.0/24, 192.168.10.0/24 }"

  loop = "lo0"

  tcp_services = "{ www, ftp }"

  boss_ip = "{ 192.168.10.10, 192.168.10.11, 192.168.10.12, 192.168.10.13, 192.168.10.14, 192.168.10.15 }"

  noroute = "{ 127.0.0.1/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8, 255.255.255.255/32 }"

  web_server = "{ 192.168.10.5, 192.168.100.16 }"

  set block-policy return

  set loginterface $ext_if

  set optimization aggressive

  scrub in all

  altq on $int_if cbq bandwidth 1200Kb queue { dflt, boss }

  queue dflt bandwidth 300Kb cbq(default)

  queue boss bandwidth 900Kb cbq(borrow)

  nat on $ext_if from $int_net to any -> $ext_if

  block all

  block return

  block in quick on $ext_if os NMAP

  block in quick on $ext_if from $noroute to any

  block out quick on $ext_if from any to $noroute

  pass in quick on $ext_if inet proto tcp from any to any port > 60000 keep state

  #pass in quick on $ext_if inet proto icmp all icmp-type 8 code 0 keep state

  pass in quick on $ext_if inet proto tcp from any to any port $tcp_services flags S/SAFR keep state

  pass quick on $loop all

  pass in

  on $int_if from $int_net

  pass out on $int_if from any to $int_net

  pass out on $int_if from any to $boss_ip queue boss

  pass out on $ext_if all keep state

  pass in on $ext_if inet proto tcp from any to $web_server port = 80 flags S/SAFR keep state (max 200, source-track rule, max-src-nodes 200, max-src-states 2) queue boss

  =========================pf.conf=======================

  禁用系统自定义的PF规则

  # vi /etc/rc.conf

  pf=NO

  启用IP转发:

  # vi /etc/sysctl.conf

  net.inet.ip.forwarding=1

  设置开机启动ADSL拨号:

  # mkdir /etc/rc.d

  # vi /etc/rc.d/adsl.sh

  --------------+----------------+---------------+-------------

  #!/bin/sh

  # /etc/rc.d/adsl.sh

  # 7-11-2004

  # llzqq@126.com

  pppoe_status () {

  IP=$(/sbin/ifconfig tun0 | awk '/netmask/{print $2}')

  if [ ! -z "$IP" ]; then

  echo "pppoe link is up, ip: " $IP

  else

  echo "pppoe link is down"

  fi

  }

  pppoe_start () {

  echo -n "starting pppoe "; ppp -ddial pppoe > /dev/null

  for i in 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0; do

  sleep 2; echo -n "."

  IP=$(/sbin/ifconfig tun0 | awk '/netmask/{print $2}')

  if [ ! -z "$IP" ]; then

  break

  fi

  done

  echo "."

  pppoe_status

  }

  pppoe_stop () {

  PID=$(ps aux | awk '/ppp -ddial/{print $2}')

  kill $PID

  echo "pppoe link is down"

  }

  case "$1" in

  'start')

  pppoe_start

  ;;

  'stop')

  pppoe_stop

  ;;

  'status')

  pppoe_status

  ;;

  *)

  echo "Usage: $0 {start|stop|status}"

  exit 1

  esac

  --------------+----------------+---------------+-------------

  # chmod 555 /etc/rc.d/adsl.sh

  开机时自动进行ADSL拨号

  # vi /etc/rc.local

  if [ -f /etc/ppp/ppp.conf ]; then

  . /etc/rc.d/adsl.sh start

  fi

  # vi /etc/rc.shutdown

  /etc/rc.d/adsl.sh stop

  启用NAME缓存服务器(不是必须的):

  # vi /var/named/named.boot

  options forward-only

  forwarders 202.99.160.68 202.99.168.8

  根据拨号需要加载和关闭防火墙:

  # vi /etc/ppp/ppp.linkup

  MYADDR:

  ! sh -c "/sbin/ifconfig pflog0 up"

  ! sh -c "/sbin/pflogd"

  ! sh -c "/sbin/pfctl -e -F all -f /etc/pf.conf"

  # vi /etc/ppp/ppp.linkdown

  MYADDR:

  ! sh -c "/sbin/pfctl -d -F all"

  ! sh -c "kill `cat /var/run/pflogd.pid`"

  ! sh -c "/sbin/ifconfig pflog0 down"

  ! sh -c "/sbin/route delete default"

  配置动态域名更新:

  # tar zxvf ez-ipupdate-3.0.10.tgz

  # cd ez-ipupdate-3.0.10

  # vi conf_file.c

  增加一行:

  #include <errno.h>

  # vi ez-ipupdate.c

  注释掉下面几行(4515行):

  //else

  //

  {

  //

  fprintf(stderr, "no update needed at this time\n");

  //

  }

  # ./configure

  # make

  # make install

  设置拨号后自动运行:

  # vi /etc/ppp/ppp.linkup

  MYADDR:

  ! sh -c "/sbin/ifconfig pflog0 up"

  ! sh -c "/sbin/pflogd"

  ! sh -c "/sbin/pfctl -e -F all -f /etc/pf.conf"

  !bg /usr/local/bin/ez-ipupdate -i tun0 -h nero.3322.org -S qdns -w wildcard -u user:pwd

  解决通过PF防火墙用主动模式连接外网FTP服务器的问题:

  # vi /etc/pf.conf

  rdr on $int_if proto tcp from any to any port 21 -> 127.0.0.1 port 8021

  # vi /etc/inetd.conf

  127.0.0.1:8021 stream tcp nowait root /usr/libexec/ftp-proxy ftp-proxy

  # reboot

  设置SQUID的透明代理:

  # vi /etc/squid/squid.conf

  http_port 127.0.0.1:3128

  # vi /etc/pf.conf

  rdr on $int_if proto tcp from $int_net to any port 80 -> 127.0.0.1 port 3128

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