263 lines
7.7 KiB
Bash
263 lines
7.7 KiB
Bash
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#!/bin/sh
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#
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# Script to upgrade 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 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=4.1
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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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exiterr() { echo "Error: $1" >&2; exit 1; }
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exiterr2() { exiterr "'yum install' failed."; }
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vpnupgrade() {
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if ! grep -qs "Amazon Linux release 2" /etc/system-release; then
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echo "Error: This script only supports Amazon Linux 2." >&2
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echo "For Ubuntu/Debian, use https://git.io/vpnupgrade" >&2
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echo "For CentOS/RHEL, use https://git.io/vpnupgrade-centos" >&2
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exit 1
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fi
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if [ "$(id -u)" != 0 ]; then
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exiterr "Script must be run as root. Try 'sudo sh $0'"
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fi
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case "$SWAN_VER" in
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3.2[679]|3.3[12]|4.1)
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/bin/true
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;;
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*)
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cat 1>&2 <<EOF
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Error: Libreswan version '$SWAN_VER' is not supported.
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This script can install one of the following versions:
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3.26-3.27, 3.29, 3.31-3.32 or 4.1
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EOF
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exit 1
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;;
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esac
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ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
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ipsec_ver_short=$(printf '%s' "$ipsec_ver" | sed -e 's/Linux Libreswan/Libreswan/' -e 's/ (netkey) on .*//')
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swan_ver_old=$(printf '%s' "$ipsec_ver_short" | sed -e 's/Libreswan //')
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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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echo "You already have Libreswan version $SWAN_VER installed! "
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echo "If you continue, the same version will be re-installed."
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echo
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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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clear
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cat <<EOF
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Welcome! This script will build and install Libreswan on your server.
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Additional packages required for compilation will also be installed.
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It is intended for upgrading servers to a newer Libreswan version.
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Current version: $ipsec_ver_short
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Version to install: Libreswan $SWAN_VER
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EOF
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cat <<'EOF'
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NOTE: This script will make the following changes to your IPsec config:
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- Fix obsolete ipsec.conf and/or ikev2.conf options
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- Optimize VPN ciphers
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Your other VPN configuration files will not be modified.
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EOF
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case "$SWAN_VER" in
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3.2[679]|3.3[12])
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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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;;
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esac
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printf "Do you want to continue? [y/N] "
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read -r response
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case $response in
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[yY][eE][sS]|[yY])
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echo
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echo "Please be patient. Setup is continuing..."
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echo
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;;
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*)
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echo "Abort. No changes were made."
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exit 1
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;;
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esac
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# Create and change to working dir
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mkdir -p /opt/src
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cd /opt/src || exit 1
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# Add the EPEL repository
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amazon-linux-extras install epel -y || exiterr2
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# Install necessary packages
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yum -y install nss-devel nspr-devel pkgconfig pam-devel \
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libcap-ng-devel libselinux-devel curl-devel nss-tools \
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flex bison gcc make wget sed tar \
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systemd-devel libevent-devel fipscheck-devel || exiterr2
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# Compile and install Libreswan
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swan_file="libreswan-$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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if ! { wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url2"; }; then
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exit 1
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fi
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/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
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tar xzf "$swan_file" && /bin/rm -f "$swan_file"
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cd "libreswan-$SWAN_VER" || exit 1
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[ "$SWAN_VER" = "3.26" ] && sed -i 's/-lfreebl //' mk/config.mk
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[ "$SWAN_VER" = "3.26" ] && sed -i '/blapi\.h/d' programs/pluto/keys.c
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if [ "$SWAN_VER" = "3.31" ]; then
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sed -i '916iif (!st->st_seen_fragvid) { return FALSE; }' programs/pluto/ikev2.c
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sed -i '1033s/if (/if (LIN(POLICY_IKE_FRAG_ALLOW, sk->ike->sa.st_connection->policy) \&\& sk->ike->sa.st_seen_fragvid \&\& /' \
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programs/pluto/ikev2_message.c
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fi
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[ "$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
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USE_DNSSEC=false
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EOF
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if [ "$SWAN_VER" = "3.31" ] || [ "$SWAN_VER" = "3.32" ] || [ "$SWAN_VER" = "4.1" ]; then
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echo "USE_DH2=true" >> Makefile.inc.local
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if ! grep -qs IFLA_XFRM_LINK /usr/include/linux/if_link.h; then
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echo "USE_XFRM_INTERFACE_IFLA_HEADER=true" >> Makefile.inc.local
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fi
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fi
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if [ "$SWAN_VER" = "4.1" ]; then
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echo "USE_NSS_KDF=false" >> Makefile.inc.local
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echo "FINALNSSDIR=/etc/ipsec.d" >> 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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make "-j$((NPROCS+1))" -s base && make -s install-base
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# Verify the install and clean up
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cd /opt/src || exit 1
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/bin/rm -rf "/opt/src/libreswan-$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 $SWAN_VER failed to build."
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fi
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# Restore SELinux contexts
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restorecon /etc/ipsec.d/*db 2>/dev/null
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restorecon /usr/local/sbin -Rv 2>/dev/null
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restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
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# Update IPsec config
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IKE_NEW=" ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024"
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PHASE2_NEW=" phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes256-sha2_512,aes128-sha2,aes256-sha2"
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dns_state=0
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DNS_SRV1=$(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=$DNS_SRV1/" /etc/ipsec.conf
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fi
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case "$SWAN_VER" in
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3.29|3.3[12]|4.1)
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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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;;
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esac
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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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# Restart IPsec service
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mkdir -p /run/pluto
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service ipsec restart
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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: Users upgrading to Libreswan 3.23 or newer must edit /etc/ipsec.conf
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and replace 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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## Defer setup until we have the complete script
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vpnupgrade "$@"
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exit 0
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