0c151515fe
- Add note for users downgrading to 3.22 - Add check for Libreswan 3.25 (not yet supported) - Print Libreswan versions and improve message - Cleanup
241 lines
6.6 KiB
Bash
241 lines
6.6 KiB
Bash
#!/bin/sh
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#
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# Script to upgrade Libreswan on CentOS and RHEL
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#
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# Copyright (C) 2016-2018 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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# Check https://libreswan.org for the latest version
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SWAN_VER=3.22
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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: $1" >&2; exit 1; }
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exiterr2() { exiterr "'yum install' failed."; }
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vpnupgrade() {
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if ! grep -qs -e "release 6" -e "release 7" /etc/redhat-release; then
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exiterr "This script only supports CentOS/RHEL 6 and 7."
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fi
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if [ -f /proc/user_beancounters ]; then
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exiterr "OpenVZ VPS is not supported."
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fi
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if [ "$(id -u)" != 0 ]; then
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exiterr "Script must be run as root. Try 'sudo sh $0'"
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fi
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if [ -z "$SWAN_VER" ]; then
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exiterr "Libreswan version 'SWAN_VER' not specified."
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fi
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if [ "$SWAN_VER" = "3.25" ]; then
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exiterr "Libreswan 3.25 is not yet supported."
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fi
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ipsec_ver="$(/usr/local/sbin/ipsec --version 2>/dev/null)"
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if ! printf '%s' "$ipsec_ver" | grep -q "Libreswan"; then
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exiterr "This script requires Libreswan already installed."
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fi
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if printf '%s' "$ipsec_ver" | grep -qF "$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 wish to continue anyway? [y/N] "
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read -r response
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case $response in
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[yY][eE][sS]|[yY])
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echo
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;;
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*)
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echo "Aborting."
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exit 1
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;;
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esac
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fi
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is_downgrade_to_322=0
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if [ "$SWAN_VER" = "3.22" ]; then
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if printf '%s' "$ipsec_ver" | grep -qF -e "3.23" -e "3.25"; then
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is_downgrade_to_322=1
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fi
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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 $SWAN_VER 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
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Version to be installed: Libreswan $SWAN_VER
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EOF
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if [ "$SWAN_VER" = "3.23" ]; then
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cat <<'EOF'
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WARNING: Libreswan 3.23 has an issue with connecting multiple IPsec/XAuth
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VPN clients from behind the same NAT (e.g. home router).
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Do not upgrade to 3.23 if your use cases include the above.
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EOF
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fi
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cat <<'EOF'
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NOTE: Libreswan versions 3.19 and newer require some configuration changes.
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This script will make the following changes to your /etc/ipsec.conf:
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Replace this line:
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auth=esp
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with the following:
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phase2=esp
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Replace this line:
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forceencaps=yes
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with the following:
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encapsulation=yes
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Consolidate VPN ciphers for "ike=" and "phase2alg=".
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Re-add "MODP1024" to the list of allowed "ike=" ciphers,
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which was removed from the defaults in Libreswan 3.19.
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Your other VPN configuration files will not be modified.
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EOF
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printf "Do you wish to continue? [y/N] "
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read -r response
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case $response in
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[yY][eE][sS]|[yY])
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echo
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echo "Please be patient. Setup is continuing..."
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echo
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;;
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*)
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echo "Aborting."
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exit 1
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;;
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esac
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# Create and change to working dir
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mkdir -p /opt/src
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cd /opt/src || exit 1
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# Install Wget
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yum -y install wget || exiterr2
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# Add the EPEL repository
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epel_url="https://dl.fedoraproject.org/pub/epel/epel-release-latest-$(rpm -E '%{rhel}').noarch.rpm"
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yum -y install epel-release || yum -y install "$epel_url" || exiterr2
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# Install necessary packages
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yum -y install nss-devel nspr-devel pkgconfig pam-devel \
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libcap-ng-devel libselinux-devel curl-devel \
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flex bison gcc make || exiterr2
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OPT1='--enablerepo=*server-optional*'
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OPT2='--enablerepo=*releases-optional*'
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if grep -qs "release 6" /etc/redhat-release; then
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yum -y remove libevent-devel
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yum "$OPT1" "$OPT2" -y install libevent2-devel fipscheck-devel || exiterr2
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else
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yum -y install systemd-devel || exiterr2
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yum "$OPT1" "$OPT2" -y install libevent-devel fipscheck-devel || exiterr2
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fi
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# Compile and install Libreswan
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swan_file="libreswan-$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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[ "$SWAN_VER" = "3.22" ] && sed -i '/^#define LSWBUF_CANARY/s/-2$/((char) -2)/' include/lswlog.h
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sed -i '/docker-targets\.mk/d' Makefile
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cat > Makefile.inc.local <<'EOF'
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WERROR_CFLAGS =
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USE_DNSSEC = false
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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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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 $SWAN_VER failed to build."
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fi
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# Restore SELinux contexts
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restorecon /etc/ipsec.d/*db 2>/dev/null
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restorecon /usr/local/sbin -Rv 2>/dev/null
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restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
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# Update ipsec.conf for Libreswan 3.19 and newer
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IKE_NEW=" ike=3des-sha1,3des-sha2,aes-sha1,aes-sha1;modp1024,aes-sha2,aes-sha2;modp1024"
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PHASE2_NEW=" phase2alg=3des-sha1,3des-sha2,aes-sha1,aes-sha2,aes256-sha2_512"
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sed -i".old-$(date +%F-%T)" \
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-e "s/^[[:space:]]\+auth=esp\$/ phase2=esp/" \
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-e "s/^[[:space:]]\+forceencaps=yes\$/ encapsulation=yes/" \
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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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# Restart IPsec service
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mkdir -p /run/pluto
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service ipsec restart
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echo
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echo "Libreswan $SWAN_VER was installed successfully! "
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echo
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case "$SWAN_VER" in
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3.2[3-9])
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cat <<'EOF'
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NOTE: Users upgrading to Libreswan 3.23 or newer should edit
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"/etc/ipsec.conf" and replace 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 "service ipsec restart".
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EOF
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;;
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esac
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if [ "$is_downgrade_to_322" = "1" ]; then
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cat <<'EOF'
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NOTE: Users downgrading to Libreswan 3.22 should edit
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"/etc/ipsec.conf" and replace this line:
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modecfgdns="DNS_SERVER_1, DNS_SERVER_2"
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with two lines like this:
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modecfgdns1=DNS_SERVER_1
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modecfgdns2=DNS_SERVER_2
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Then run "service ipsec restart".
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EOF
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fi
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}
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## Defer setup until we have the complete script
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vpnupgrade "$@"
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exit 0
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