294 lines
8.7 KiB
Bash
Executable File
294 lines
8.7 KiB
Bash
Executable File
#!/bin/bash
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#
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# Script to update Libreswan on Amazon Linux 2
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#
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# The latest version of this script is available at:
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# https://github.com/hwdsl2/setup-ipsec-vpn
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#
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# Copyright (C) 2020-2024 Lin Song <linsongui@gmail.com>
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#
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# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
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# Unported License: http://creativecommons.org/licenses/by-sa/3.0/
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#
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# Attribution required: please include my name in any derivative and let me
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# know how you have improved it!
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# (Optional) Specify which Libreswan version to install. See: https://libreswan.org
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# If not specified, the latest supported version will be installed.
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SWAN_VER=
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### DO NOT edit below this line ###
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export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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SYS_DT=$(date +%F-%T | tr ':' '_')
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[ -n "$VPN_UPDATE_SWAN_VER" ] && SWAN_VER="$VPN_UPDATE_SWAN_VER"
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exiterr() { echo "Error: $1" >&2; exit 1; }
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exiterr2() { exiterr "'yum install' failed."; }
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bigecho() { echo "## $1"; }
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check_root() {
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if [ "$(id -u)" != 0 ]; then
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exiterr "Script must be run as root. Try 'sudo bash $0'"
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fi
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}
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check_os() {
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if ! grep -qs "Amazon Linux release 2 " /etc/system-release; then
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exiterr "This script only supports Amazon Linux 2."
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fi
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}
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check_libreswan() {
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ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
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swan_ver_old=$(printf '%s' "$ipsec_ver" | sed -e 's/.*Libreswan U\?//' -e 's/\( (\|\/K\).*//')
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if ! printf '%s' "$ipsec_ver" | grep -qi 'libreswan'; then
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cat 1>&2 <<'EOF'
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Error: This script requires Libreswan already installed.
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See: https://github.com/hwdsl2/setup-ipsec-vpn
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EOF
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exit 1
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fi
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}
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get_swan_ver() {
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swan_ver_cur=4.12
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base_url="https://github.com/hwdsl2/vpn-extras/releases/download/v1.0.0"
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swan_ver_url="$base_url/upg-v1-amzn-2-swanver"
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swan_ver_latest=$(wget -t 2 -T 10 -qO- "$swan_ver_url" | head -n 1)
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if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9]{1,2})(\.([0-9]|[1-9][0-9]{1,2})){1,2}$'; then
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swan_ver_cur="$swan_ver_latest"
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fi
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[ -z "$SWAN_VER" ] && SWAN_VER="$swan_ver_cur"
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}
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check_swan_ver() {
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if [ "$SWAN_VER" = "4.8" ]; then
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exiterr "Libreswan version 4.8 is not supported."
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fi
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if [ "$SWAN_VER" != "3.32" ] \
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&& { ! printf '%s\n%s' "4.1" "$SWAN_VER" | sort -C -V \
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|| ! printf '%s\n%s' "$SWAN_VER" "$swan_ver_cur" | sort -C -V; }; then
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cat 1>&2 <<EOF
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Error: Libreswan version '$SWAN_VER' is not supported.
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This script can install one of these versions:
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3.32, 4.1-$swan_ver_cur
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EOF
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exit 1
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fi
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}
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show_setup_info() {
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cat <<EOF
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Welcome! Use this script to update Libreswan on your IPsec VPN server.
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Current version: Libreswan $swan_ver_old
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Version to install: Libreswan $SWAN_VER
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Note: This script will make the following changes to your VPN configuration:
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- Fix obsolete ipsec.conf and/or ikev2.conf options
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- Optimize VPN ciphers
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- Update IKEv2 helper script
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Your other VPN config files will not be modified.
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EOF
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if [ "$SWAN_VER" != "$swan_ver_cur" ]; then
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cat <<'EOF'
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WARNING: Older versions of Libreswan could contain known security vulnerabilities.
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See https://libreswan.org/security/ for more information.
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Are you sure you want to install an older version?
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EOF
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fi
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if [ "$swan_ver_old" = "$SWAN_VER" ]; then
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cat <<EOF
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Note: You already have Libreswan version $SWAN_VER installed!
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If you continue, the same version will be re-installed.
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EOF
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fi
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printf "Do you want to continue? [Y/n] "
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read -r response
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case $response in
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[yY][eE][sS]|[yY]|'')
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echo
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;;
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*)
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echo "Abort. No changes were made."
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exit 1
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;;
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esac
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}
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start_setup() {
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mkdir -p /opt/src
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cd /opt/src || exit 1
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}
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install_pkgs() {
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bigecho "Installing required packages..."
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(
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set -x
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yum -y -q install nss-devel nspr-devel pkgconfig pam-devel \
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libcap-ng-devel libselinux-devel curl-devel nss-tools \
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flex bison gcc make wget sed tar \
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systemd-devel libevent-devel fipscheck-devel >/dev/null
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) || exiterr2
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}
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get_libreswan() {
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bigecho "Downloading Libreswan..."
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cd /opt/src || exit 1
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swan_file="libreswan-$SWAN_VER.tar.gz"
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swan_url1="https://github.com/libreswan/libreswan/archive/v$SWAN_VER.tar.gz"
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swan_url2="https://download.libreswan.org/$swan_file"
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(
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set -x
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wget -t 3 -T 30 -q -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -q -O "$swan_file" "$swan_url2"
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) || exit 1
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/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
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tar xzf "$swan_file" && /bin/rm -f "$swan_file"
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}
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install_libreswan() {
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bigecho "Compiling and installing Libreswan, please wait..."
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cd "libreswan-$SWAN_VER" || exit 1
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service ipsec stop >/dev/null 2>&1
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[ "$SWAN_VER" = "4.1" ] && sed -i 's/ sysv )/ sysvinit )/' programs/setup/setup.in
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cat > Makefile.inc.local <<'EOF'
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WERROR_CFLAGS=-w -s
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USE_DNSSEC=false
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USE_DH2=true
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EOF
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if [ "$SWAN_VER" != "3.32" ]; then
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cat >> Makefile.inc.local <<'EOF'
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USE_NSS_KDF=false
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USE_LINUX_AUDIT=false
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USE_SECCOMP=false
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FINALNSSDIR=/etc/ipsec.d
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EOF
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fi
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if ! grep -qs IFLA_XFRM_LINK /usr/include/linux/if_link.h; then
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echo "USE_XFRM_INTERFACE_IFLA_HEADER=true" >> Makefile.inc.local
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fi
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NPROCS=$(grep -c ^processor /proc/cpuinfo)
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[ -z "$NPROCS" ] && NPROCS=1
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(
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set -x
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make "-j$((NPROCS+1))" -s base >/dev/null && make -s install-base >/dev/null
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)
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cd /opt/src || exit 1
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/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
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if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qF "$SWAN_VER"; then
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service ipsec start >/dev/null 2>&1
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exiterr "Libreswan $SWAN_VER failed to build."
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fi
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}
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restore_selinux() {
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restorecon /etc/ipsec.d/*db 2>/dev/null
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restorecon /usr/local/sbin -Rv 2>/dev/null
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restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
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}
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update_ikev2_script() {
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bigecho "Updating IKEv2 script..."
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cd /opt/src || exit 1
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ikev2_url="https://raw.githubusercontent.com/hwdsl2/setup-ipsec-vpn/master/extras/ikev2setup.sh"
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(
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set -x
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wget -t 3 -T 30 -q -O ikev2.sh.new "$ikev2_url"
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) || /bin/rm -f ikev2.sh.new
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if [ -s ikev2.sh.new ]; then
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[ -s ikev2.sh ] && /bin/cp -f ikev2.sh "ikev2.sh.old-$SYS_DT"
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/bin/cp -f ikev2.sh.new ikev2.sh && chmod +x ikev2.sh \
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&& ln -s /opt/src/ikev2.sh /usr/bin 2>/dev/null
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/bin/rm -f ikev2.sh.new
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fi
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}
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update_config() {
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bigecho "Updating VPN configuration..."
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IKE_NEW=" ike=aes256-sha2;modp2048,aes128-sha2;modp2048,aes256-sha1;modp2048,aes128-sha1;modp2048"
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PHASE2_NEW=" phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2"
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dns_state=0
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DNS_SRV1=$(grep "modecfgdns1=" /etc/ipsec.conf | head -n 1 | cut -d '=' -f 2)
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DNS_SRV2=$(grep "modecfgdns2=" /etc/ipsec.conf | head -n 1 | cut -d '=' -f 2)
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[ -n "$DNS_SRV1" ] && dns_state=2
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[ -n "$DNS_SRV1" ] && [ -n "$DNS_SRV2" ] && dns_state=1
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[ "$(grep -c "modecfgdns1=" /etc/ipsec.conf)" -gt "1" ] && dns_state=3
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sed -i".old-$SYS_DT" \
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-e "s/^[[:space:]]\+auth=/ phase2=/" \
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-e "s/^[[:space:]]\+forceencaps=/ encapsulation=/" \
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-e "s/^[[:space:]]\+ike-frag=/ fragmentation=/" \
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-e "s/^[[:space:]]\+sha2_truncbug=/ sha2-truncbug=/" \
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-e "s/^[[:space:]]\+sha2-truncbug=yes/ sha2-truncbug=no/" \
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-e "s/^[[:space:]]\+ike=.\+/$IKE_NEW/" \
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-e "s/^[[:space:]]\+phase2alg=.\+/$PHASE2_NEW/" /etc/ipsec.conf
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if [ "$dns_state" = 1 ]; then
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sed -i -e "s/^[[:space:]]\+modecfgdns1=.\+/ modecfgdns=\"$DNS_SRV1 $DNS_SRV2\"/" \
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-e "/modecfgdns2=/d" /etc/ipsec.conf
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elif [ "$dns_state" = 2 ]; then
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sed -i "s/^[[:space:]]\+modecfgdns1=.\+/ modecfgdns=$DNS_SRV1/" /etc/ipsec.conf
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fi
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sed -i "/ikev2=never/d" /etc/ipsec.conf
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sed -i "/conn shared/a \ ikev2=never" /etc/ipsec.conf
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if grep -qs ike-frag /etc/ipsec.d/ikev2.conf; then
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sed -i".old-$SYS_DT" 's/^[[:space:]]\+ike-frag=/ fragmentation=/' /etc/ipsec.d/ikev2.conf
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fi
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}
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restart_ipsec() {
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bigecho "Restarting IPsec service..."
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mkdir -p /run/pluto
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service ipsec restart 2>/dev/null
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}
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show_setup_complete() {
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cat <<EOF
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================================================
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Libreswan $SWAN_VER has been successfully installed!
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================================================
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EOF
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if [ "$dns_state" = 3 ]; then
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cat <<'EOF'
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IMPORTANT: You must edit /etc/ipsec.conf and replace
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all occurrences of these two lines:
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modecfgdns1=DNS_SERVER_1
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modecfgdns2=DNS_SERVER_2
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with a single line like this:
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modecfgdns="DNS_SERVER_1 DNS_SERVER_2"
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Then run "sudo service ipsec restart".
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EOF
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fi
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}
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vpnupgrade() {
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check_root
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check_os
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check_libreswan
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get_swan_ver
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check_swan_ver
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show_setup_info
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start_setup
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install_pkgs
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get_libreswan
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install_libreswan
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restore_selinux
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update_ikev2_script
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update_config
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restart_ipsec
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show_setup_complete
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}
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## Defer setup until we have the complete script
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vpnupgrade "$@"
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exit 0
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