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vpnupgrade.sh
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vpnupgrade.sh
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#!/bin/sh
#
# Script to upgrade Libreswan on Ubuntu and Debian
#
# Copyright (C) 2016-2019 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=3.29
### DO NOT edit below this line ###
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
exiterr() { echo "Error: $1" >&2; exit 1; }
exiterr2() { exiterr "'apt-get install' failed."; }
vpnupgrade() {
os_type=$(lsb_release -si 2>/dev/null)
if [ -z "$os_type" ]; then
[ -f /etc/os-release ] && os_type=$(. /etc/os-release && printf '%s' "$ID")
[ -f /etc/lsb-release ] && os_type=$(. /etc/lsb-release && printf '%s' "$DISTRIB_ID")
fi
if ! printf '%s' "$os_type" | head -n 1 | grep -qiF -e ubuntu -e debian -e raspbian; then
exiterr "This script only supports Ubuntu and Debian."
fi
if [ "$(sed 's/\..*//' /etc/debian_version)" = "7" ]; then
exiterr "Debian 7 is not supported."
fi
if [ -f /proc/user_beancounters ]; then
exiterr "OpenVZ VPS is not supported."
fi
if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo sh $0'"
fi
case "$SWAN_VER" in
3.19|3.2[01235679])
/bin/true
;;
*)
cat 1>&2 <<EOF
Error: Libreswan version '$SWAN_VER' is not supported.
This script can install one of the following versions:
3.19-3.23, 3.25-3.27 and 3.29
EOF
exit 1
;;
esac
dns_state=0
case "$SWAN_VER" in
3.2[35679])
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=5
;;
3.19|3.2[012])
DNS_SRVS=$(grep "modecfgdns=" /etc/ipsec.conf | head -n 1 | cut -d '=' -f 2)
DNS_SRVS=$(printf '%s' "$DNS_SRVS" | cut -d '"' -f 2 | cut -d "'" -f 2 | sed 's/,/ /g' | tr -s ' ')
DNS_SRV1=$(printf '%s' "$DNS_SRVS" | cut -d ' ' -f 1)
DNS_SRV2=$(printf '%s' "$DNS_SRVS" | cut -s -d ' ' -f 2)
[ -n "$DNS_SRV1" ] && dns_state=4
[ -n "$DNS_SRV1" ] && [ -n "$DNS_SRV2" ] && dns_state=3
[ "$(grep -c "modecfgdns=" /etc/ipsec.conf)" -gt "1" ] && dns_state=6
;;
esac
ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
ipsec_ver_short=$(printf '%s' "$ipsec_ver" | sed -e 's/Linux Libreswan/Libreswan/' -e 's/ (netkey) on .*//')
if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
exiterr "This script requires Libreswan already installed."
fi
if printf '%s' "$ipsec_ver" | grep -qF "$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 wish to continue anyway? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Aborting."
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: $ipsec_ver_short
Version to install: Libreswan $SWAN_VER
EOF
case "$SWAN_VER" in
3.2[35])
cat <<'EOF'
WARNING: Libreswan 3.23 and 3.25 have an issue with connecting multiple
IPsec/XAuth VPN clients from behind the same NAT (e.g. home router).
DO NOT upgrade to 3.23/3.25 if your use cases include the above.
EOF
;;
esac
cat <<'EOF'
NOTE: Libreswan versions 3.19 and newer require some configuration changes.
This script will make the following updates to your /etc/ipsec.conf:
- Replace "auth=esp" with "phase2=esp"
- Replace "forceencaps=yes" with "encapsulation=yes"
- Optimize VPN ciphers for "ike=" and "phase2alg="
EOF
if [ "$dns_state" = "1" ] || [ "$dns_state" = "2" ]; then
cat <<'EOF'
- Replace "modecfgdns1" and "modecfgdns2" with "modecfgdns"
EOF
fi
if [ "$dns_state" = "3" ] || [ "$dns_state" = "4" ]; then
cat <<'EOF'
- Replace "modecfgdns" with "modecfgdns1" and "modecfgdns2"
EOF
fi
if [ "$SWAN_VER" = "3.29" ]; then
cat <<'EOF'
- Move "ikev2=never" to section "conn shared"
EOF
fi
cat <<'EOF'
Your other VPN configuration files will not be modified.
EOF
printf "Do you wish to continue? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
echo "Please be patient. Setup is continuing..."
echo
;;
*)
echo "Aborting."
exit 1
;;
esac
# Create and change to working dir
mkdir -p /opt/src
cd /opt/src || exit 1
# Update package index
export DEBIAN_FRONTEND=noninteractive
apt-get -yq update || exiterr "'apt-get update' failed."
# Install necessary packages
apt-get -yq install libnss3-dev libnspr4-dev pkg-config \
libpam0g-dev libcap-ng-dev libcap-ng-utils libselinux1-dev \
libcurl4-nss-dev libnss3-tools libevent-dev \
flex bison gcc make wget sed || exiterr2
# Compile and install Libreswan
swan_file="libreswan-$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"
if ! { wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url2"; }; then
exit 1
fi
/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
tar xzf "$swan_file" && /bin/rm -f "$swan_file"
cd "libreswan-$SWAN_VER" || exit 1
[ "$SWAN_VER" = "3.22" ] && sed -i '/^#define LSWBUF_CANARY/s/-2$/((char) -2)/' include/lswlog.h
[ "$SWAN_VER" = "3.23" ] || [ "$SWAN_VER" = "3.25" ] && sed -i '/docker-targets\.mk/d' Makefile
[ "$SWAN_VER" = "3.26" ] && sed -i 's/-lfreebl //' mk/config.mk
[ "$SWAN_VER" = "3.26" ] && sed -i '/blapi\.h/d' programs/pluto/keys.c
cat > Makefile.inc.local <<'EOF'
WERROR_CFLAGS =
USE_DNSSEC = false
USE_DH31 = false
USE_NSS_AVA_COPY = true
USE_NSS_IPSEC_PROFILE = false
USE_GLIBC_KERN_FLIP_HEADERS = true
EOF
if [ "$(packaging/utils/lswan_detect.sh init)" = "systemd" ]; then
apt-get -yq install libsystemd-dev || exiterr2
fi
NPROCS=$(grep -c ^processor /proc/cpuinfo)
[ -z "$NPROCS" ] && NPROCS=1
make "-j$((NPROCS+1))" -s base && make -s install-base
# Verify the install and clean up
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 $SWAN_VER failed to build."
fi
# Update ipsec.conf
IKE_NEW=" ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024"
PHASE2_NEW=" phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2"
if uname -m | grep -qi '^arm'; then
PHASE2_NEW=" phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes128-sha2,aes256-sha2"
fi
sed -i".old-$(date +%F-%T)" \
-e "s/^[[:space:]]\+auth=esp\$/ phase2=esp/g" \
-e "s/^[[:space:]]\+forceencaps=yes\$/ encapsulation=yes/g" \
-e "s/^[[:space:]]\+ike=.\+\$/$IKE_NEW/g" \
-e "s/^[[:space:]]\+phase2alg=.\+\$/$PHASE2_NEW/g" /etc/ipsec.conf
if [ "$dns_state" = "1" ]; then
sed -i -e "s/modecfgdns1=.*/modecfgdns=\"$DNS_SRV1 $DNS_SRV2\"/" \
-e "/modecfgdns2/d" /etc/ipsec.conf
elif [ "$dns_state" = "2" ]; then
sed -i "s/modecfgdns1=.*/modecfgdns=$DNS_SRV1/" /etc/ipsec.conf
elif [ "$dns_state" = "3" ]; then
sed -i "/modecfgdns=/a \ modecfgdns2=$DNS_SRV2" /etc/ipsec.conf
sed -i "s/modecfgdns=.*/modecfgdns1=$DNS_SRV1/" /etc/ipsec.conf
elif [ "$dns_state" = "4" ]; then
sed -i "s/modecfgdns=.*/modecfgdns1=$DNS_SRV1/" /etc/ipsec.conf
fi
if [ "$SWAN_VER" = "3.29" ]; then
sed -i "/ikev2=never/d" /etc/ipsec.conf
sed -i "/dpdaction=clear/a \ ikev2=never" /etc/ipsec.conf
fi
# Restart IPsec service
mkdir -p /run/pluto
service ipsec restart
cat <<EOF
===================================================
Libreswan $SWAN_VER has been successfully installed!
===================================================
EOF
if [ "$dns_state" = "5" ]; then
cat <<'EOF'
IMPORTANT: Users upgrading to Libreswan 3.23 or newer 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
elif [ "$dns_state" = "6" ]; then
cat <<'EOF'
IMPORTANT: Users downgrading to Libreswan 3.22 or older must edit /etc/ipsec.conf
and replace all occurrences of this line:
modecfgdns="DNS_SERVER_1 DNS_SERVER_2"
with two lines like this:
modecfgdns1=DNS_SERVER_1
modecfgdns2=DNS_SERVER_2
Then run "sudo service ipsec restart".
EOF
fi
}
## Defer setup until we have the complete script
vpnupgrade "$@"
exit 0