使用脚本
wget --no-check-certificate https://raw.githubusercontent.com/teddysun/across/master/l2tp.sh
赋权限然后安装
chmod 700 l2tp.sh
./l2tp.sh
会有以下交互式界面
###############################################################
# L2TP VPN Auto Installer #
# System Supported: CentOS 6+ / Debian 7+ / Ubuntu 12+ #
# Intro: https://teddysun.com/448.html #
# Author: Teddysun <i@teddysun.com> #
###############################################################
########## System Information ##########
CPU model : Intel(R) Xeon(R) CPU E5-26xx v3
Number of cores : 1
CPU frequency : 2299.998 MHz
Total amount of ram : 996 MB
Total amount of swap : 0 MB
System uptime : 0days, 0:9:12
Load average : 0.00, 0.00, 0.00
OS : CentOS 6.8
Arch : x86_64 (64 Bit)
Kernel : 2.6.32-642.6.2.el6.x86_64
Hostname : VM_105_26_centos
IPv4 address : 118.89.107.217
########################################
Please enter IP-Range:
(Default Range: 192.168.18):
Please input IP-Range:
(Default Range: 192.168.18):
输入本地IP段范围（本地电脑连接到VPS后给分配的一个本地IP地址），直接回车意味着输入默认值192.168.18
Please input PSK:
(Default PSK: teddysun.com):
PSK意为预共享密钥，即指定一个密钥将来在连接时需要用到，直接回车意味着输入默认值teddysun.com
Please input Username:
(Default Username: teddysun):
Username意为用户名，即第一个默认用户。直接回车意味着输入默认值teddysun
Please input teddysun’s password:
(Default Password: Q4SKhu2EXQ):
输入用户的密码，默认会随机生成一个10位包含大小写字母和数字的密码，当然你也可以指定密码。
ServerIP:your_server_main_IP
显示你的 VPS 的主 IP（如果是多 IP 的 VPS 也只显示一个）
Server Local IP:192.168.18.1
显示你的 VPS 的本地 IP（默认即可）
Client Remote IP Range:192.168.18.2-192.168.18.254
显示 IP 段范围
PSK:teddysun.com
显示 PSK
Press any key to start…or Press Ctrl+c to cancel
按下任意按键继续，如果想取消安装，请按Ctrl+c键
安装完成后会给出所有的安装信息和使用方式
l2tp -a 新增用户
l2tp -d 删除用户
l2tp -m 修改现有的用户的密码
l2tp -l 列出所有用户名和密码
l2tp -h 列出帮助信息
其他事项：
1、脚本在安装完成后，已自动启动进程，并加入了开机自启动。
2、脚本会改写 iptables 或 firewalld 的规则。
3、脚本安装时，会即时将安装日志写到 /root/l2tp.log 文件里，如果你安装失败，可以通过此文件来寻找错误信息。
使用命令：
ipsec status （查看 IPSec 运行状态）
ipsec verify （查看 IPSec 检查结果）
/etc/init.d/ipsec start|stop|restart|status （CentOS6 下使用）
/etc/init.d/xl2tpd start|stop|restart （CentOS6 下使用）
systemctl start|stop|restart|status ipsec （CentOS7 下使用）
systemctl start|stop|restart xl2tpd （CentOS7 下使用）
service ipsec start|stop|restart|status （Debian/Ubuntu 下使用）
service xl2tpd start|stop|restart （Debian/Ubuntu 下使用）
脚本代码如下
#!/usr/bin/env bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
#=======================================================================#
# System Supported: CentOS 6+ / Debian 7+ / Ubuntu 12+ #
# Description: L2TP VPN Auto Installer #
# Author: Teddysun <i@teddysun.com> #
# Intro: https://teddysun.com/448.html #
#=======================================================================#
cur_dir=`pwd`
libreswan_filename="libreswan-3.20"
rootness(){
if [[ $EUID -ne 0 ]]; then
echo "Error:This script must be run as root!" 1>&2
exit 1
fi
}
tunavailable(){
if [[ ! -e /dev/net/tun ]]; then
echo "Error:TUN/TAP is not available!" 1>&2
exit 1
fi
}
disable_selinux(){
if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; then
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
setenforce 0
fi
}
get_opsy(){
[ -f /etc/redhat-release ] && awk '{print ($1,$3~/^[0-9]/?$3:$4)}' /etc/redhat-release && return
[ -f /etc/os-release ] && awk -F'[= "]' '/PRETTY_NAME/{print $3,$4,$5}' /etc/os-release && return
[ -f /etc/lsb-release ] && awk -F'[="]+' '/DESCRIPTION/{print $2}' /etc/lsb-release && return
}
get_os_info(){
IP=$( ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1 )
[ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipv4.icanhazip.com )
local cname=$( awk -F: '/model name/ {name=$2} END {print name}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//' )
local cores=$( awk -F: '/model name/ {core++} END {print core}' /proc/cpuinfo )
local freq=$( awk -F: '/cpu MHz/ {freq=$2} END {print freq}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//' )
local tram=$( free -m | awk '/Mem/ {print $2}' )
local swap=$( free -m | awk '/Swap/ {print $2}' )
local up=$( awk '{a=$1/86400;b=($1%86400)/3600;c=($1%3600)/60;d=$1%60} {printf("%ddays, %d:%d:%d\n",a,b,c,d)}' /proc/uptime )
local load=$( w | head -1 | awk -F'load average:' '{print $2}' | sed 's/^[ \t]*//;s/[ \t]*$//' )
local opsy=$( get_opsy )
local arch=$( uname -m )
local lbit=$( getconf LONG_BIT )
local host=$( hostname )
local kern=$( uname -r )
echo "########## System Information ##########"
echo
echo "CPU model : ${cname}"
echo "Number of cores : ${cores}"
echo "CPU frequency : ${freq} MHz"
echo "Total amount of ram : ${tram} MB"
echo "Total amount of swap : ${swap} MB"
echo "System uptime : ${up}"
echo "Load average : ${load}"
echo "OS : ${opsy}"
echo "Arch : ${arch} (${lbit} Bit)"
echo "Kernel : ${kern}"
echo "Hostname : ${host}"
echo "IPv4 address : ${IP}"
echo
echo "########################################"
}
check_sys(){
local checkType=$1
local value=$2
local release=''
local systemPackage=''
if [[ -f /etc/redhat-release ]]; then
release="centos"
systemPackage="yum"
elif cat /etc/issue | grep -Eqi "debian"; then
release="debian"
systemPackage="apt"
elif cat /etc/issue | grep -Eqi "ubuntu"; then
release="ubuntu"
systemPackage="apt"
elif cat /etc/issue | grep -Eqi "centos|red hat|redhat"; then
release="centos"
systemPackage="yum"
elif cat /proc/version | grep -Eqi "debian"; then
release="debian"
systemPackage="apt"
elif cat /proc/version | grep -Eqi "ubuntu"; then
release="ubuntu"
systemPackage="apt"
elif cat /proc/version | grep -Eqi "centos|red hat|redhat"; then
release="centos"
systemPackage="yum"
fi
if [[ ${checkType} == "sysRelease" ]]; then
if [ "$value" == "$release" ];then
return 0
else
return 1
fi
elif [[ ${checkType} == "packageManager" ]]; then
if [ "$value" == "$systemPackage" ];then
return 0
else
return 1
fi
fi
}
rand(){
index=0
str=""
for i in {a..z}; do arr[index]=${i}; index=`expr ${index} + 1`; done
for i in {A..Z}; do arr[index]=${i}; index=`expr ${index} + 1`; done
for i in {0..9}; do arr[index]=${i}; index=`expr ${index} + 1`; done
for i in {1..10}; do str="$str${arr[$RANDOM%$index]}"; done
echo ${str}
}
is_64bit(){
if [ `getconf WORD_BIT` = '32' ] && [ `getconf LONG_BIT` = '64' ] ; then
return 0
else
return 1
fi
}
download_file(){
local download_root_url="http://dl.teddysun.com/files"
if [ -s ${1} ]; then
echo "$1 [found]"
else
echo "$1 not found!!!download now..."
if ! wget -c -t3 -T60 ${download_root_url}/${1}; then
echo "Failed to download $1, please download it to ${cur_dir} directory manually and try again."
exit 1
fi
fi
}
versionget(){
if [[ -s /etc/redhat-release ]];then
grep -oE "[0-9.]+" /etc/redhat-release
else
grep -oE "[0-9.]+" /etc/issue
fi
}
centosversion(){
if check_sys sysRelease centos;then
local code=${1}
local version="`versionget`"
local main_ver=${version%%.*}
if [ "${main_ver}" == "${code}" ];then
return 0
else
return 1
fi
else
return 1
fi
}
debianversion(){
if check_sys sysRelease debian;then
local version=$( get_opsy )
local code=${1}
local main_ver=$( echo ${version} | sed 's/[^0-9]//g')
if [ "${main_ver}" == "${code}" ];then
return 0
else
return 1
fi
else
return 1
fi
}
version_check(){
if check_sys packageManager yum; then
if centosversion 5; then
echo "Error: CentOS 5 is not supported, Please re-install OS and try again."
exit 1
fi
fi
}
get_char(){
SAVEDSTTY=`stty -g`
stty -echo
stty cbreak
dd if=/dev/tty bs=1 count=1 2> /dev/null
stty -raw
stty echo
stty $SAVEDSTTY
}
preinstall_l2tp(){
echo
if [ -d "/proc/vz" ]; then
echo -e "\033[41;37m WARNING: \033[0m Your VPS is based on OpenVZ, and IPSec might not be supported by the kernel."
echo "Continue installation? (y/n)"
read -p "(Default: n)" agree
[ -z ${agree} ] && agree="n"
if [ "${agree}" == "n" ]; then
echo
echo "L2TP installation cancelled."
echo
exit 0
fi
fi
echo
echo "Please enter IP-Range:"
read -p "(Default Range: 192.168.18):" iprange
[ -z ${iprange} ] && iprange="192.168.18"
echo "Please enter PSK:"
read -p "(Default PSK: teddysun.com):" mypsk
[ -z ${mypsk} ] && mypsk="teddysun.com"
echo "Please enter Username:"
read -p "(Default Username: teddysun):" username
[ -z ${username} ] && username="teddysun"
password=`rand`
echo "Please enter ${username}'s password:"
read -p "(Default Password: ${password}):" tmppassword
[ ! -z ${tmppassword} ] && password=${tmppassword}
echo
echo "ServerIP:${IP}"
echo "Server Local IP:${iprange}.1"
echo "Client Remote IP Range:${iprange}.2-${iprange}.254"
echo "PSK:${mypsk}"
echo
echo "Press any key to start... or press Ctrl + C to cancel."
char=`get_char`
}
install_l2tp(){
mknod /dev/random c 1 9
if check_sys packageManager apt; then
apt-get -y update
if debianversion 7; then
if is_64bit; then
local libnspr4_filename1="libnspr4_4.10.7-1_amd64.deb"
local libnspr4_filename2="libnspr4-0d_4.10.7-1_amd64.deb"
local libnspr4_filename3="libnspr4-dev_4.10.7-1_amd64.deb"
local libnspr4_filename4="libnspr4-dbg_4.10.7-1_amd64.deb"
local libnss3_filename1="libnss3_3.17.2-1.1_amd64.deb"
local libnss3_filename2="libnss3-1d_3.17.2-1.1_amd64.deb"
local libnss3_filename3="libnss3-tools_3.17.2-1.1_amd64.deb"
local libnss3_filename4="libnss3-dev_3.17.2-1.1_amd64.deb"
local libnss3_filename5="libnss3-dbg_3.17.2-1.1_amd64.deb"
else
local libnspr4_filename1="libnspr4_4.10.7-1_i386.deb"
local libnspr4_filename2="libnspr4-0d_4.10.7-1_i386.deb"
local libnspr4_filename3="libnspr4-dev_4.10.7-1_i386.deb"
local libnspr4_filename4="libnspr4-dbg_4.10.7-1_i386.deb"
local libnss3_filename1="libnss3_3.17.2-1.1_i386.deb"
local libnss3_filename2="libnss3-1d_3.17.2-1.1_i386.deb"
local libnss3_filename3="libnss3-tools_3.17.2-1.1_i386.deb"
local libnss3_filename4="libnss3-dev_3.17.2-1.1_i386.deb"
local libnss3_filename5="libnss3-dbg_3.17.2-1.1_i386.deb"
fi
rm -rf ${cur_dir}/l2tp
mkdir -p ${cur_dir}/l2tp
cd ${cur_dir}/l2tp
download_file "${libnspr4_filename1}"
download_file "${libnspr4_filename2}"
download_file "${libnspr4_filename3}"
download_file "${libnspr4_filename4}"
download_file "${libnss3_filename1}"
download_file "${libnss3_filename2}"
download_file "${libnss3_filename3}"
download_file "${libnss3_filename4}"
download_file "${libnss3_filename5}"
dpkg -i ${libnspr4_filename1} ${libnspr4_filename2} ${libnspr4_filename3} ${libnspr4_filename4}
dpkg -i ${libnss3_filename1} ${libnss3_filename2} ${libnss3_filename3} ${libnss3_filename4} ${libnss3_filename5}
apt-get -y install wget gcc ppp flex bison make pkg-config libpam0g-dev libcap-ng-dev iptables \
libcap-ng-utils libunbound-dev libevent-dev libcurl4-nss-dev libsystemd-daemon-dev
else
apt-get -y install wget gcc ppp flex bison make python libnss3-dev libnss3-tools libselinux-dev iptables \
libnspr4-dev pkg-config libpam0g-dev libcap-ng-dev libcap-ng-utils libunbound-dev \
libevent-dev libcurl4-nss-dev libsystemd-dev
fi
apt-get -y --no-install-recommends install xmlto
apt-get -y install xl2tpd
compile_install
elif check_sys packageManager yum; then
echo "Adding the EPEL repository..."
yum -y install epel-release
[ ! -f /etc/yum.repos.d/epel.repo ] && echo "Install EPEL repository failed, please check it." && exit 1
if centosversion 7; then
yum -y install ppp libreswan xl2tpd firewalld
yum_install
elif centosversion 6; then
yum -y remove libevent-devel
yum -y install libevent2-devel
yum -y install nss-devel nspr-devel pkgconfig pam-devel \
libcap-ng-devel libselinux-devel lsof \
curl-devel flex bison gcc ppp make iptables gmp-devel \
fipscheck-devel unbound-devel xmlto libpcap-devel xl2tpd
compile_install
fi
fi
}
config_install(){
cat > /etc/ipsec.conf<<EOF
version 2.0
config setup
protostack=netkey
nhelpers=0
uniqueids=no
interfaces=%defaultroute
virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!${iprange}.0/24
conn l2tp-psk
rightsubnet=vhost:%priv
also=l2tp-psk-nonat
conn l2tp-psk-nonat
authby=secret
pfs=no
auto=add
keyingtries=3
rekey=no
ikelifetime=8h
keylife=1h
type=transport
left=%defaultroute
leftid=${IP}
leftprotoport=17/1701
right=%any
rightprotoport=17/%any
dpddelay=40
dpdtimeout=130
dpdaction=clear
sha2-truncbug=yes
EOF
cat > /etc/ipsec.secrets<<EOF
%any %any : PSK "${mypsk}"
EOF
cat > /etc/xl2tpd/xl2tpd.conf<<EOF
[global]
port = 1701
[lns default]
ip range = ${iprange}.2-${iprange}.254
local ip = ${iprange}.1
require chap = yes
refuse pap = yes
require authentication = yes
name = l2tpd
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
EOF
cat > /etc/ppp/options.xl2tpd<<EOF
ipcp-accept-local
ipcp-accept-remote
require-mschap-v2
ms-dns 8.8.8.8
ms-dns 8.8.4.4
noccp
auth
hide-password
idle 1800
mtu 1410
mru 1410
nodefaultroute
debug
proxyarp
connect-delay 5000
EOF
rm -f /etc/ppp/chap-secrets
cat > /etc/ppp/chap-secrets<<EOF
# Secrets for authentication using CHAP
# client server secret IP addresses
${username} l2tpd ${password} *
EOF
}
compile_install(){
rm -rf ${cur_dir}/l2tp
mkdir -p ${cur_dir}/l2tp
cd ${cur_dir}/l2tp
download_file "${libreswan_filename}.tar.gz"
tar -zxf ${libreswan_filename}.tar.gz
cd ${cur_dir}/l2tp/${libreswan_filename}
echo "WERROR_CFLAGS =" > Makefile.inc.local
make programs && make install
/usr/local/sbin/ipsec --version >/dev/null 2>&1
if [ $? -ne 0 ]; then
echo "${libreswan_filename} install failed."
exit 1
fi
config_install
cp -pf /etc/sysctl.conf /etc/sysctl.conf.bak
sed -i 's/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/g' /etc/sysctl.conf
for each in `ls /proc/sys/net/ipv4/conf/`; do
echo "net.ipv4.conf.${each}.accept_source_route=0" >> /etc/sysctl.conf
echo "net.ipv4.conf.${each}.accept_redirects=0" >> /etc/sysctl.conf
echo "net.ipv4.conf.${each}.send_redirects=0" >> /etc/sysctl.conf
echo "net.ipv4.conf.${each}.rp_filter=0" >> /etc/sysctl.conf
done
sysctl -p
if centosversion 6; then
[ -f /etc/sysconfig/iptables ] && cp -pf /etc/sysconfig/iptables /etc/sysconfig/iptables.old.`date +%Y%m%d`
if [ "`iptables -L -n | grep -c '\-\-'`" == "0" ]; then
cat > /etc/sysconfig/iptables <<EOF
# Added by L2TP VPN script
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp --dport 22 -j ACCEPT
-A INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -s ${iprange}.0/24 -j ACCEPT
COMMIT
*nat
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
COMMIT
EOF
else
iptables -I INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD -s ${iprange}.0/24 -j ACCEPT
iptables -t nat -A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
/etc/init.d/iptables save
fi
if [ ! -f /etc/ipsec.d/cert9.db ]; then
echo > /var/tmp/libreswan-nss-pwd
certutil -N -f /var/tmp/libreswan-nss-pwd -d /etc/ipsec.d
rm -f /var/tmp/libreswan-nss-pwd
fi
chkconfig --add iptables
chkconfig iptables on
chkconfig --add ipsec
chkconfig ipsec on
chkconfig --add xl2tpd
chkconfig xl2tpd on
/etc/init.d/iptables restart
/etc/init.d/ipsec start
/etc/init.d/xl2tpd start
else
[ -f /etc/iptables.rules ] && cp -pf /etc/iptables.rules /etc/iptables.rules.old.`date +%Y%m%d`
if [ "`iptables -L -n | grep -c '\-\-'`" == "0" ]; then
cat > /etc/iptables.rules <<EOF
# Added by L2TP VPN script
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp --dport 22 -j ACCEPT
-A INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -s ${iprange}.0/24 -j ACCEPT
COMMIT
*nat
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
COMMIT
EOF
else
iptables -I INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD -s ${iprange}.0/24 -j ACCEPT
iptables -t nat -A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
/sbin/iptables-save > /etc/iptables.rules
fi
cat > /etc/network/if-up.d/iptables <<EOF
#!/bin/sh
/sbin/iptables-restore < /etc/iptables.rules
EOF
chmod +x /etc/network/if-up.d/iptables
if [ ! -f /etc/ipsec.d/cert9.db ]; then
echo > /var/tmp/libreswan-nss-pwd
certutil -N -f /var/tmp/libreswan-nss-pwd -d /etc/ipsec.d
rm -f /var/tmp/libreswan-nss-pwd
fi
update-rc.d -f xl2tpd defaults
cp -f /etc/rc.local /etc/rc.local.old.`date +%Y%m%d`
sed --follow-symlinks -i -e '/^exit 0/d' /etc/rc.local
cat >> /etc/rc.local <<EOF
# Added by L2TP VPN script
echo 1 > /proc/sys/net/ipv4/ip_forward
/usr/sbin/service ipsec start
exit 0
EOF
chmod +x /etc/rc.local
echo 1 > /proc/sys/net/ipv4/ip_forward
/sbin/iptables-restore < /etc/iptables.rules
/usr/sbin/service ipsec start
/usr/sbin/service xl2tpd restart
fi
}
yum_install(){
config_install
cp -pf /etc/sysctl.conf /etc/sysctl.conf.bak
echo "# Added by L2TP VPN" >> /etc/sysctl.conf
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_syncookies=1" >> /etc/sysctl.conf
echo "net.ipv4.icmp_echo_ignore_broadcasts=1" >> /etc/sysctl.conf
echo "net.ipv4.icmp_ignore_bogus_error_responses=1" >> /etc/sysctl.conf
for each in `ls /proc/sys/net/ipv4/conf/`; do
echo "net.ipv4.conf.${each}.accept_source_route=0" >> /etc/sysctl.conf
echo "net.ipv4.conf.${each}.accept_redirects=0" >> /etc/sysctl.conf
echo "net.ipv4.conf.${each}.send_redirects=0" >> /etc/sysctl.conf
echo "net.ipv4.conf.${each}.rp_filter=0" >> /etc/sysctl.conf
done
sysctl -p
cat > /etc/firewalld/services/xl2tpd.xml<<EOF
<?xml version="1.0" encoding="utf-8"?>
<service>
<short>xl2tpd</short>
<description>L2TP IPSec</description>
<port protocol="udp" port="4500"/>
<port protocol="udp" port="1701"/>
</service>
EOF
chmod 640 /etc/firewalld/services/xl2tpd.xml
systemctl enable ipsec
systemctl enable xl2tpd
systemctl enable firewalld
systemctl status firewalld > /dev/null 2>&1
if [ $? -eq 0 ]; then
firewall-cmd --reload
echo "Checking firewalld status..."
firewall-cmd --list-all
echo "add firewalld rules..."
firewall-cmd --permanent --add-service=ipsec
firewall-cmd --permanent --add-service=xl2tpd
firewall-cmd --permanent --add-masquerade
firewall-cmd --reload
else
echo "Firewalld looks like not running, trying to start..."
systemctl start firewalld
if [ $? -eq 0 ]; then
echo "Firewalld start successfully..."
firewall-cmd --reload
echo "Checking firewalld status..."
firewall-cmd --list-all
echo "adding firewalld rules..."
firewall-cmd --permanent --add-service=ipsec
firewall-cmd --permanent --add-service=xl2tpd
firewall-cmd --permanent --add-masquerade
firewall-cmd --reload
else
echo "Failed to start firewalld. please enable udp port 500 4500 1701 manually if necessary."
fi
fi
systemctl restart ipsec
systemctl restart xl2tpd
echo "Checking ipsec status..."
systemctl -a | grep ipsec
echo "Checking xl2tpd status..."
systemctl -a | grep xl2tpd
echo "Checking firewalld status..."
firewall-cmd --list-all
}
finally(){
cd ${cur_dir}
rm -fr ${cur_dir}/l2tp
# create l2tp command
cp -f ${cur_dir}/`basename $0` /usr/bin/l2tp
echo "Please wait a moment..."
sleep 5
ipsec verify
echo
echo "###############################################################"
echo "# L2TP VPN Auto Installer #"
echo "# System Supported: CentOS 6+ / Debian 7+ / Ubuntu 12+ #"
echo "# Intro: https://teddysun.com/448.html #"
echo "# Author: Teddysun <i@teddysun.com> #"
echo "###############################################################"
echo "If there is no [FAILED] above, you can connect to your L2TP "
echo "VPN Server with the default Username/Password is below:"
echo
echo "Server IP: ${IP}"
echo "PSK : ${mypsk}"
echo "Username : ${username}"
echo "Password : ${password}"
echo
echo "If you want to modify user settings, please use below command(s):"
echo "l2tp -a (Add a user)"
echo "l2tp -d (Delete a user)"
echo "l2tp -l (List all users)"
echo "l2tp -m (Modify a user password)"
echo
echo "Welcome to visit our website: https://teddysun.com/448.html"
echo "Enjoy it!"
echo
}
l2tp(){
clear
echo
echo "###############################################################"
echo "# L2TP VPN Auto Installer #"
echo "# System Supported: CentOS 6+ / Debian 7+ / Ubuntu 12+ #"
echo "# Intro: https://teddysun.com/448.html #"
echo "# Author: Teddysun <i@teddysun.com> #"
echo "###############################################################"
echo
rootness
tunavailable
disable_selinux
version_check
get_os_info
preinstall_l2tp
install_l2tp
finally
}
list_users(){
if [ ! -f /etc/ppp/chap-secrets ];then
echo "Error: /etc/ppp/chap-secrets file not found."
exit 1
fi
local line="+-------------------------------------------+\n"
local string=%20s
printf "${line}|${string} |${string} |\n${line}" Username Password
grep -v "^#" /etc/ppp/chap-secrets | awk '{printf "|'${string}' |'${string}' |\n", $1,$3}'
printf ${line}
}
add_user(){
while :
do
read -p "Please input your Username:" user
if [ -z ${user} ]; then
echo "Username can not be empty"
else
grep -w "${user}" /etc/ppp/chap-secrets > /dev/null 2>&1
if [ $? -eq 0 ];then
echo "Username (${user}) already exists. Please re-enter your username."
else
break
fi
fi
done
pass=`rand`
echo "Please input ${user}'s password:"
read -p "(Default Password: ${pass}):" tmppass
[ ! -z ${tmppass} ] && pass=${tmppass}
echo "${user} l2tpd ${pass} *" >> /etc/ppp/chap-secrets
echo "Username (${user}) add completed."
}
del_user(){
while :
do
read -p "Please input Username you want to delete it:" user
if [ -z ${user} ]; then
echo "Username can not be empty"
else
grep -w "${user}" /etc/ppp/chap-secrets >/dev/null 2>&1
if [ $? -eq 0 ];then
break
else
echo "Username (${user}) is not exists. Please re-enter your username."
fi
fi
done
sed -i "/^\<${user}\>/d" /etc/ppp/chap-secrets
echo "Username (${user}) delete completed."
}
mod_user(){
while :
do
read -p "Please input Username you want to change password:" user
if [ -z ${user} ]; then
echo "Username can not be empty"
else
grep -w "${user}" /etc/ppp/chap-secrets >/dev/null 2>&1
if [ $? -eq 0 ];then
break
else
echo "Username (${user}) is not exists. Please re-enter your username."
fi
fi
done
pass=`rand`
echo "Please input ${user}'s new password:"
read -p "(Default Password: ${pass}):" tmppass
[ ! -z ${tmppass} ] && pass=${tmppass}
sed -i "/^\<${user}\>/d" /etc/ppp/chap-secrets
echo "${user} l2tpd ${pass} *" >> /etc/ppp/chap-secrets
echo "Username ${user}'s password has been changed."
}
# Main process
action=$1
if [ -z ${action} ] && [ "`basename $0`" != "l2tp" ]; then
action=install
fi
case ${action} in
install)
l2tp 2>&1 | tee ${cur_dir}/l2tp.log
;;
-l|--list)
list_users
;;
-a|--add)
add_user
;;
-d|--del)
del_user
;;
-m|--mod)
mod_user
;;
-h|--help)
echo "Usage: `basename $0` -l,--list List all users"
echo " `basename $0` -a,--add Add a user"
echo " `basename $0` -d,--del Delete a user"
echo " `basename $0` -m,--mod Modify a user password"
echo " `basename $0` -h,--help Print this help information"
;;
*)
echo "Usage: `basename $0` [-l,--list|-a,--add|-d,--del|-m,--mod|-h,--help]" && exit
;;
esac
手动安装
下载环境包
yum install -y make gcc gmp-devel xmlto bison flex xmlto libpcap-devel lsof vim-enhanced man
安装
yum install openswan ppp xl2tpd
修改配置文件
修改ipsec.conf
vi /etc/ipsec.conf
替换为如下内容，把下面0.0.0.0换成服务器的外网IP（注意一定要有字符缩进，距离不要改变）
config setup
nat_traversal=yes
virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12
oe=off
protostack=netkey
conn L2TP-PSK-NAT
rightsubnet=vhost:%priv
also=L2TP-PSK-noNAT
conn L2TP-PSK-noNAT
authby=secret
pfs=no
auto=add
keyingtries=3
rekey=no
ikelifetime=8h
keylife=1h
type=transport
left=0.0.0.0 #服务器的外网IP
leftprotoport=17/1701
right=%any
rightprotoport=17/%any
#网上查找客户端经常断开优化
dpddelay=40
dpdtimeout=130
dpdaction=clear
leftnexthop=%defaultroute
rightnexthop=%defaultroute
修改xl2tpd.conf
/etc/xl2tpd/xl2tpd.conf
ip range 写客户端的内网IP段，local ip写客户端内网IP
[lns default]
ip range = 10.10.0.2-10.10.0.100
local ip = 10.10.0.1
require chap = yes
refuse pap = yes
require authentication = yes
name = LinuxVPNserver
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
bps = 1000000
修改ipsec.secrets
vi /etc/ipsec.secrets
替换内容如下：（0.0.0.0换成服务器的外网IP也可以写%any）
include /etc/ipsec.d/*.secrets
0.0.0.0 %any: PSK "自己定" 隧道密码
配置用户名,密码:编辑 /etc/ppp/chap-secrets
# Secrets for authentication using CHAP
# client server secret IP addresses
"username" l2tpd "userpass" * #619错误注意双引号
注：username换成你要登录的用户名，userpass换成密码
修改sysctl.conf
vi /etc/sysctl.conf
在/etc/sysctl.conf的末尾加上如下内容
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.default.log_martians = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.icmp_ignore_bogus_error_responses = 1
生效上面的修改使用如下命令
sysctl -p
验证ipsec运行状态
ipsec restart
ipsec verify
出现以下说明成功
Verifying installed system and configuration files
Version check and ipsec on-path [OK]
Libreswan 3.20 (netkey) on 2.6.32-642.6.2.el6.x86_64
Checking for IPsec support in kernel [OK]
NETKEY: Testing XFRM related proc values
ICMP default/send_redirects [OK]
ICMP default/accept_redirects [OK]
XFRM larval drop [OK]
Pluto ipsec.conf syntax [OK]
Checking rp_filter [OK]
Checking that pluto is running [OK]
Pluto listening for IKE on udp 500 [OK]
Pluto listening for IKE/NAT-T on udp 4500 [OK]
Pluto ipsec.secret syntax INTERNAL ERROR - unknown rcode:WARNING（密码强度不足导致）
003 WARNING: using a weak secret (PSK)
Checking 'ip' command [OK]
Checking 'iptables' command [OK]
Checking 'prelink' command does not interfere with FIPS [IN USE]
Checking for obsolete ipsec.conf options [OK]
ipsec verify: encountered 2 errors - see 'man ipsec_verify' for help
重启xl2tp
service xl2tpd restart
因为VPN需要路由功能习惯使用IPTABLES
vi /etc/sysconfig/iptables
在:OUTPUT ACCEPT添加以下条目
-A POSTROUTING -s 192.168.20.0/24 -o eth0 -j SNAT --to-source 10.105.105.26
vpn拨入后的包通过eth0转发
192.168.20.0/24跟/etc/xl2tpd/xl2tpd.conf的设置相对应，eth0要改成你内网的网络名字
10.105.105.26要改成你eth0对应的ip地址
还有对应的所需端口的防火墙的通行
查看已用端口
netstat -tuanp
保存后记得
service iptables restart
chkconfig iptables on
查看拨号日志
vi /var/log/message
Maximum retries exceeded for tunnel 可能是认证之间的协议问题，最好有2台以上的客户端连接，可能是服务器或者客户端问题
额外需求
1、配置单独的l2tp日志记录
这里可以利用syslog来配置，在/etc/rsyslog.d/ 下新建20-xl2tpd.conf文件，内容如下：
[root@server17 rsyslog.d]# cat 20-xl2tpd.conf
if $programname == 'xl2tpd' then /var/log/xl2tpd.log
&~
这里可以利用syslog来配置，在/etc/rsyslog.d/ 下新建20-pptpd.conf文件，内容如下：
[root@server17 rsyslog.d]# cat 20-pptpd.conf
if $programname == 'pppd' then /var/log/xl2tpd.log
&~
但是这样只能在日志中看到客户端的公网IP地址、私网IP等信息，却无法看到是哪个用户登录的，这不利于做审计工作，所以需要能将连接用户的信息也写入到日志中，解决方法如下：
在/etc/ppp/ip-up 脚本中加入
echo "Start_Time: `date -d today +%F_%T`" >> /var/log/xl2tpd.log ##登录时间戳
echo "username: $PEERNAME" >> /var/log/xl2tpd.log ##用户名
在/etc/ppp/ip-down 脚本中加入
echo "Stop_Time: `date -d today +%F_%T`" >> /var/log/xl2tpd.log ##断开时间戳
echo "username: $PEERNAME" >> /var/log/xl2tpd.log ##用户名
重启rsyslog服务
service rsyslog restart
最终的日志信息如下，客户端的公网IP、获取的内网IP、用户名、时间等重要信息都被记录下来了。
cat /var/log/xl2tpd.log
Nov 5 13:47:57 server17 xl2tpd[24509]: control_finish: Peer requested tunnel 29 twice, ignoring second one.
Nov 5 13:47:58 server17 xl2tpd[24509]: Connection established to 202.202.202.202, 1701. Local: 36071, Remote: 29 (ref=0/0). LNS session is 'default'
Nov 5 13:47:58 server17 xl2tpd[24509]: result_code_avp: result code not appropriate for Incoming-Call-Request. Ignoring.
Nov 5 13:47:58 server17 xl2tpd[24509]: Call established with 202.202.202.202, Local: 3764, Remote: 1, Serial: 0
Nov 5 13:47:58 server17 pppd[16218]: pppd 2.4.5 started by root, uid 0
Nov 5 13:47:58 server17 pppd[16218]: using channel 28
Nov 5 13:47:58 server17 pppd[16218]: Using interface ppp0
Nov 5 13:47:58 server17 pppd[16218]: Connect: ppp0 /dev/pts/0
Nov 5 13:47:58 server17 pppd[16218]: sent [LCP ConfReq id=0x1 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [LCP ConfReq id=0x0 ]
Nov 5 13:47:58 server17 pppd[16218]: sent [LCP ConfRej id=0x0 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [LCP ConfAck id=0x1 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [LCP ConfReq id=0x1 ]
Nov 5 13:47:58 server17 pppd[16218]: sent [LCP ConfAck id=0x1 ]
Nov 5 13:47:58 server17 pppd[16218]: sent [CHAP Challenge id=0xfd , name = "LinuxVPNserver"]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [LCP Ident id=0x2 magic=0x5597000a "MSRASV5.20"]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [LCP Ident id=0x3 magic=0x5597000a "MSRAS-0-WWW-PC"]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [LCP Ident id=0x4 magic=0x5597000a "\3777777774012@?\37777777642\37777777705A\37777777642\37777777623\021\37777777764\37777777656;t$"]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [CHAP Response id=0xfd , name = "wujr"]
Nov 5 13:47:58 server17 pppd[16218]: sent [CHAP Success id=0xfd "Access granted"]
Nov 5 13:47:58 server17 pppd[16218]: sent [IPCP ConfReq id=0x1 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [IPV6CP ConfReq id=0x5 ]
Nov 5 13:47:58 server17 pppd[16218]: Unsupported protocol 'IPv6 Control Protocol' (0x8057) received
Nov 5 13:47:58 server17 pppd[16218]: sent [LCP ProtRej id=0x2 80 57 01 05 00 0e 01 0a b8 71 8f aa 3d c3 d8 78]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [IPCP ConfReq id=0x6 ]
Nov 5 13:47:58 server17 pppd[16218]: sent [IPCP ConfRej id=0x6 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [IPCP ConfRej id=0x1 ]
Nov 5 13:47:58 server17 pppd[16218]: sent [IPCP ConfReq id=0x2 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [IPCP ConfReq id=0x7 ]
Nov 5 13:47:58 server17 pppd[16218]: sent [IPCP ConfNak id=0x7 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [IPCP ConfAck id=0x2 ]
Nov 5 13:47:58 server17 pppd[16218]: rcvd [IPCP ConfReq id=0x8 ]
Nov 5 13:47:58 server17 pppd[16218]: sent [IPCP ConfAck id=0x8 ]
Nov 5 13:47:58 server17 pppd[16218]: Cannot determine ethernet address for proxy ARP
Nov 5 13:47:58 server17 pppd[16218]: local IP address 192.168.100.1
Nov 5 13:47:58 server17 pppd[16218]: remote IP address 192.168.100.10
Nov 5 13:47:58 server17 pppd[16218]: Script /etc/ppp/ip-up started (pid 16225)
Start_Time: 2015-11-05_13:47:58
username: test
Nov 5 13:47:58 server17 pppd[16218]: Script /etc/ppp/ip-up finished (pid 16225), status = 0x0
2、使用VPN服务器公网做为客户端互联网出口（跳板机、代理）
使用iptables实现，增加规则
iptables -t nat -A POSTROUTING -o eth1 -s 192.168.100.0/24 -j MASQUERADE （eth1为公网网卡）
3、访问VPN服务器所在的内网其它服务器
使用iptables实现，增加规则
iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -o eth0 -j MASQUERADE （eth0为私网网卡）h
错误处理

这两个错误可以不管，运行“/etc/init.d/ipsec restart
”之后，重新“ipsec verify

解决新的错误，需要在终端运行：
for each in /proc/sys/net/ipv4/conf/*
do
echo 0 > $each/accept_redirects
echo 0 > $each/send_redirects
done
继续“ipsec verify”，已知的错误成功解决。