312 lines
8.5 KiB
Bash
312 lines
8.5 KiB
Bash
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#!/bin/bash
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#
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# Script to update Libreswan on Alpine Linux
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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) 2021 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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# Specify which Libreswan version to install. See: https://libreswan.org
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SWAN_VER=4.5
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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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[ -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 "'apk add' 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 $0'"
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fi
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}
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check_vz() {
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if [ -f /proc/user_beancounters ]; then
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exiterr "OpenVZ VPS is not supported."
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fi
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}
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check_os() {
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os_type=$(lsb_release -si 2>/dev/null)
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os_arch=$(uname -m | tr -dc 'A-Za-z0-9_-')
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[ -z "$os_type" ] && [ -f /etc/os-release ] && os_type=$(. /etc/os-release && printf '%s' "$ID")
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case $os_type in
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[Aa]lpine)
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os_type=alpine
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;;
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*)
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exiterr "This script only supports Alpine Linux."
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;;
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esac
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os_ver=$(. /etc/os-release && printf '%s' "$VERSION_ID" | cut -d '.' -f 1,2)
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if [ "$os_ver" != "3.14" ]; then
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exiterr "This script only supports Alpine Linux 3.14."
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fi
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}
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check_libreswan() {
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case $SWAN_VER in
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4.5)
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true
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;;
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*)
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cat 1>&2 <<EOF
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Error: Libreswan version '$SWAN_VER' is not supported.
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This script can install Libreswan 4.5.
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EOF
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exit 1
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;;
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esac
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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' "$ipsec_ver" | grep -q "Libreswan"; then
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cat 1>&2 <<'EOF'
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Error: This script requires Libreswan already installed.
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See: https://github.com/hwdsl2/setup-ipsec-vpn
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EOF
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exit 1
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fi
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if [ "$swan_ver_old" = "$SWAN_VER" ]; then
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cat <<EOF
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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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printf "Do you want to continue anyway? [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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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 $SWAN_VER
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Note: This script will make the following changes to your VPN configuration:
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- Fix obsolete ipsec.conf and/or ikev2.conf options
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- Optimize VPN ciphers
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Your other VPN config files will not be modified.
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EOF
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if [ "$SWAN_VER" != "4.5" ]; 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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printf "Do you want to continue? [y/N] "
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read -r response
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case $response in
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[yY][eE][sS]|[yY])
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echo
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;;
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*)
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echo "Abort. No changes were made."
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exit 1
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;;
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esac
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}
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start_setup() {
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# shellcheck disable=SC2154
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trap 'dlo=$dl;dl=$LINENO' DEBUG 2>/dev/null
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trap 'finish $? $((dlo+1))' EXIT
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mkdir -p /opt/src
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cd /opt/src || exit 1
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}
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install_pkgs() {
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bigecho "Installing required packages..."
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(
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set -x
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apk add -U -q bash bind-tools coreutils openssl wget iproute2 sed grep \
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libcap-ng libcurl libevent linux-pam musl nspr nss nss-tools \
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bison flex gcc make libc-dev bsd-compat-headers linux-pam-dev nss-dev \
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libcap-ng-dev libevent-dev curl-dev nspr-dev uuidgen openrc
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) || exiterr2
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}
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get_libreswan() {
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bigecho "Downloading Libreswan..."
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swan_file="libreswan-$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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sed -i '28s/stdlib\.h/sys\/types.h/' include/fd.h
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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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FINALNSSDIR=/etc/ipsec.d
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USE_GLIBC_KERN_FLIP_HEADERS=true
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EOF
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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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exiterr "Libreswan $SWAN_VER failed to build."
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fi
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}
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update_config() {
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bigecho "Updating VPN configuration..."
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IKE_NEW=" ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024"
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PHASE2_NEW=" phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2"
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if uname -m | grep -qi '^arm'; then
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if ! modprobe -q sha512; then
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PHASE2_NEW=" phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes128-sha2,aes256-sha2"
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fi
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fi
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dns_state=0
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DNS_SRV1=$(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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[ "$(grep -c "modecfgdns1=" /etc/ipsec.conf)" -gt "1" ] && dns_state=3
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sed -i".old-$(date +%F-%T)" \
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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 '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 >/dev/null 2>&1
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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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check_swan_ver() {
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swan_ver_cur=4.5
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swan_ver_url="https://dl.ls20.com/v1/$os_type/$os_ver/swanverupg?arch=$os_arch&ver1=$swan_ver_old&ver2=$SWAN_VER"
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[ "$1" != "0" ] && swan_ver_url="$swan_ver_url&e=$2"
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swan_ver_latest=$(wget -t 3 -T 15 -qO- "$swan_ver_url")
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if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9]{1,2})(\.([0-9]|[1-9][0-9]{1,2})){1,2}$' \
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&& [ "$1" = "0" ] && [ "$swan_ver_cur" != "$swan_ver_latest" ] \
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&& printf '%s\n%s' "$swan_ver_cur" "$swan_ver_latest" | sort -C -V; then
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cat <<EOF
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Note: A newer version of Libreswan ($swan_ver_latest) is available.
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To update, run:
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wget https://git.io/vpnupgrade -O vpnup.sh && sudo sh vpnup.sh
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EOF
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fi
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}
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finish() {
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check_swan_ver "$1" "$2"
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exit "$1"
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}
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vpnupgrade() {
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check_root
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check_vz
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check_os
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check_libreswan
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show_setup_info
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start_setup
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install_pkgs
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get_libreswan
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install_libreswan
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update_config
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restart_ipsec
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show_setup_complete
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}
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## Defer setup until we have the complete script
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vpnupgrade "$@"
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exit 0
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