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vpnupgrade_centos.sh
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vpnupgrade_centos.sh
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#!/bin/sh
#
# Script to upgrade Libreswan on CentOS and RHEL
#
# The latest version of this script is available at:
# https://github.com/hwdsl2/setup-ipsec-vpn
#
# Copyright (C) 2016-2021 Lin Song <linsongui@gmail.com>
#
# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
# Unported License: http://creativecommons.org/licenses/by-sa/3.0/
#
# Attribution required: please include my name in any derivative and let me
# know how you have improved it!
# Specify which Libreswan version to install. See: https://libreswan.org
SWAN_VER=4.4
### DO NOT edit below this line ###
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
exiterr() { echo "Error: $1" >&2; exit 1; }
exiterr2() { exiterr "'yum install' failed."; }
bigecho() { echo "## $1"; }
vpnupgrade() {
os_type=centos
os_arch=$(uname -m | tr -dc 'A-Za-z0-9_-')
rh_file="/etc/redhat-release"
if grep -qs "Red Hat" "$rh_file"; then
os_type=rhel
fi
if grep -qs "release 7" "$rh_file"; then
os_ver=7
elif grep -qs "release 8" "$rh_file"; then
os_ver=8
if grep -qi stream "$rh_file"; then
os_ver=8s
fi
else
echo "Error: This script only supports CentOS/RHEL 7 and 8." >&2
echo "For Ubuntu/Debian, use https://git.io/vpnupgrade" >&2
exit 1
fi
if [ -f /proc/user_beancounters ]; then
exiterr "OpenVZ VPS is not supported."
fi
if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo sh $0'"
fi
case $SWAN_VER in
3.32|4.[1234])
true
;;
*)
cat 1>&2 <<EOF
Error: Libreswan version '$SWAN_VER' is not supported.
This script can install one of these versions:
3.32, 4.1-4.3 or 4.4
EOF
exit 1
;;
esac
ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
cat 1>&2 <<'EOF'
Error: This script requires Libreswan already installed.
See: https://github.com/hwdsl2/setup-ipsec-vpn
EOF
exit 1
fi
swan_ver_cur=4.4
swan_ver_url="https://dl.ls20.com/v1/$os_type/$os_ver/swanverupg?arch=$os_arch&ver1=$swan_ver_old&ver2=$SWAN_VER"
swan_ver_latest=$(wget -t 3 -T 15 -qO- "$swan_ver_url")
if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9]{1,2})(\.([0-9]|[1-9][0-9]{1,2})){1,2}$' \
&& [ "$swan_ver_cur" != "$swan_ver_latest" ] \
&& printf '%s\n%s' "$swan_ver_cur" "$swan_ver_latest" | sort -C -V; then
echo "Note: A newer version of Libreswan ($swan_ver_latest) is available."
echo " To update to the new version, exit this script and run:"
echo " wget https://git.io/vpnupgrade-centos -O vpnup.sh && sudo sh vpnup.sh"
echo
printf "Do you want to continue anyway? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
fi
if [ "$swan_ver_old" = "$SWAN_VER" ]; then
echo "You already have Libreswan version $SWAN_VER installed! "
echo "If you continue, the same version will be re-installed."
echo
printf "Do you want to continue anyway? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
fi
clear
cat <<EOF
Welcome! This script will build and install Libreswan on your server.
Additional packages required for compilation will also be installed.
It is intended for upgrading servers to a newer Libreswan version.
Current version: Libreswan $swan_ver_old
Version to install: Libreswan $SWAN_VER
EOF
cat <<'EOF'
Note: This script will make the following changes to your VPN configuration:
- Fix obsolete ipsec.conf and/or ikev2.conf options
- Optimize VPN ciphers
Your other VPN config files will not be modified.
EOF
if [ "$SWAN_VER" != "4.4" ]; then
cat <<'EOF'
WARNING: Older versions of Libreswan could contain known security vulnerabilities.
See https://libreswan.org/security/ for more information.
Are you sure you want to install an older version?
EOF
fi
printf "Do you want to continue? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
bigecho "Please be patient. Setup is continuing..."
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
mkdir -p /opt/src
cd /opt/src || exit 1
bigecho "Installing required packages..."
(
set -x
yum -y -q install nss-devel nspr-devel pkgconfig pam-devel \
libcap-ng-devel libselinux-devel curl-devel nss-tools \
flex bison gcc make wget sed tar >/dev/null
) || exiterr2
erp="--enablerepo"
rp1="$erp=*server-*optional*"
rp2="$erp=*releases-optional*"
rp3="$erp=[Pp]ower[Tt]ools"
[ "$os_type" = "rhel" ] && rp3="$erp=codeready-builder-for-rhel-8-*"
if [ "$os_ver" = "7" ]; then
(
set -x
yum "$rp1" "$rp2" -y -q install systemd-devel libevent-devel fipscheck-devel >/dev/null
) || exiterr2
else
(
set -x
yum "$rp3" -y -q install systemd-devel libevent-devel fipscheck-devel >/dev/null
) || exiterr2
fi
bigecho "Downloading Libreswan..."
swan_file="libreswan-$SWAN_VER.tar.gz"
swan_url1="https://github.com/libreswan/libreswan/archive/v$SWAN_VER.tar.gz"
swan_url2="https://download.libreswan.org/$swan_file"
(
set -x
wget -t 3 -T 30 -q -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -q -O "$swan_file" "$swan_url2"
) || exit 1
/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
tar xzf "$swan_file" && /bin/rm -f "$swan_file"
bigecho "Compiling and installing Libreswan, please wait..."
cd "libreswan-$SWAN_VER" || exit 1
[ "$SWAN_VER" = "4.1" ] && sed -i 's/ sysv )/ sysvinit )/' programs/setup/setup.in
cat > Makefile.inc.local <<'EOF'
WERROR_CFLAGS=-w
USE_DNSSEC=false
EOF
echo "USE_DH2=true" >> Makefile.inc.local
if ! grep -qs IFLA_XFRM_LINK /usr/include/linux/if_link.h; then
echo "USE_XFRM_INTERFACE_IFLA_HEADER=true" >> Makefile.inc.local
fi
if [ "$SWAN_VER" != "3.32" ]; then
echo "USE_NSS_KDF=false" >> Makefile.inc.local
echo "FINALNSSDIR=/etc/ipsec.d" >> Makefile.inc.local
fi
NPROCS=$(grep -c ^processor /proc/cpuinfo)
[ -z "$NPROCS" ] && NPROCS=1
(
set -x
make "-j$((NPROCS+1))" -s base >/dev/null && make -s install-base >/dev/null
)
cd /opt/src || exit 1
/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qF "$SWAN_VER"; then
exiterr "Libreswan $SWAN_VER failed to build."
fi
# Restore SELinux contexts
restorecon /etc/ipsec.d/*db 2>/dev/null
restorecon /usr/local/sbin -Rv 2>/dev/null
restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
bigecho "Updating VPN configuration..."
IKE_NEW=" ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024"
PHASE2_NEW=" phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2"
dns_state=0
DNS_SRV1=$(grep "modecfgdns1=" /etc/ipsec.conf | head -n 1 | cut -d '=' -f 2)
DNS_SRV2=$(grep "modecfgdns2=" /etc/ipsec.conf | head -n 1 | cut -d '=' -f 2)
[ -n "$DNS_SRV1" ] && dns_state=2
[ -n "$DNS_SRV1" ] && [ -n "$DNS_SRV2" ] && dns_state=1
[ "$(grep -c "modecfgdns1=" /etc/ipsec.conf)" -gt "1" ] && dns_state=3
sed -i".old-$(date +%F-%T)" \
-e "s/^[[:space:]]\+auth=/ phase2=/" \
-e "s/^[[:space:]]\+forceencaps=/ encapsulation=/" \
-e "s/^[[:space:]]\+ike-frag=/ fragmentation=/" \
-e "s/^[[:space:]]\+sha2_truncbug=/ sha2-truncbug=/" \
-e "s/^[[:space:]]\+sha2-truncbug=yes/ sha2-truncbug=no/" \
-e "s/^[[:space:]]\+ike=.\+/$IKE_NEW/" \
-e "s/^[[:space:]]\+phase2alg=.\+/$PHASE2_NEW/" /etc/ipsec.conf
if [ "$dns_state" = "1" ]; then
sed -i -e "s/^[[:space:]]\+modecfgdns1=.\+/ modecfgdns=\"$DNS_SRV1 $DNS_SRV2\"/" \
-e "/modecfgdns2=/d" /etc/ipsec.conf
elif [ "$dns_state" = "2" ]; then
sed -i "s/^[[:space:]]\+modecfgdns1=.\+/ modecfgdns=$DNS_SRV1/" /etc/ipsec.conf
fi
sed -i "/ikev2=never/d" /etc/ipsec.conf
sed -i "/conn shared/a \ ikev2=never" /etc/ipsec.conf
if grep -qs ike-frag /etc/ipsec.d/ikev2.conf; then
sed -i 's/^[[:space:]]\+ike-frag=/ fragmentation=/' /etc/ipsec.d/ikev2.conf
fi
bigecho "Restarting IPsec service..."
mkdir -p /run/pluto
service ipsec restart 2>/dev/null
cat <<EOF
================================================
Libreswan $SWAN_VER has been successfully installed!
================================================
EOF
if [ "$dns_state" = "3" ]; then
cat <<'EOF'
IMPORTANT: You must edit /etc/ipsec.conf and replace
all occurrences of these two lines:
modecfgdns1=DNS_SERVER_1
modecfgdns2=DNS_SERVER_2
with a single line like this:
modecfgdns="DNS_SERVER_1 DNS_SERVER_2"
Then run "sudo service ipsec restart".
EOF
fi
}
## Defer setup until we have the complete script
vpnupgrade "$@"
exit 0