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setup-ipsec-vpn/extras/ikev2setup.sh
hwdsl2 83d7309147 Cleanup
2021-01-23 18:20:49 -06:00

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#!/bin/bash
#
# Script to set up IKEv2 on Ubuntu, Debian, CentOS/RHEL and Amazon Linux 2
#
# The latest version of this script is available at:
# https://github.com/hwdsl2/setup-ipsec-vpn
#
# Copyright (C) 2020-2021 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!
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
SYS_DT=$(date +%F-%T | tr ':' '_')
exiterr() { echo "Error: $1" >&2; exit 1; }
bigecho() { echo; echo "## $1"; echo; }
bigecho2() { echo; echo "## $1"; }
check_ip() {
IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
}
check_dns_name() {
FQDN_REGEX='^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$FQDN_REGEX"
}
check_run_as_root() {
if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo bash $0'"
fi
}
check_os_type() {
os_arch=$(uname -m | tr -dc 'A-Za-z0-9_-')
if grep -qs -e "release 7" -e "release 8" /etc/redhat-release; then
os_type=centos
if grep -qs "Red Hat" /etc/redhat-release; then
os_type=rhel
fi
if grep -qs "release 7" /etc/redhat-release; then
os_ver=7
elif grep -qs "release 8" /etc/redhat-release; then
os_ver=8
fi
elif grep -qs "Amazon Linux release 2" /etc/system-release; then
os_type=amzn
os_ver=2
else
os_type=$(lsb_release -si 2>/dev/null)
[ -z "$os_type" ] && [ -f /etc/os-release ] && os_type=$(. /etc/os-release && printf '%s' "$ID")
case $os_type in
[Uu]buntu)
os_type=ubuntu
;;
[Dd]ebian)
os_type=debian
;;
[Rr]aspbian)
os_type=raspbian
;;
*)
exiterr "This script only supports Ubuntu, Debian, CentOS/RHEL 7/8 and Amazon Linux 2."
exit 1
;;
esac
os_ver=$(sed 's/\..*//' /etc/debian_version | tr -dc 'A-Za-z0-9')
fi
}
check_utils_exist() {
command -v certutil >/dev/null 2>&1 || exiterr "'certutil' not found. Abort."
command -v pk12util >/dev/null 2>&1 || exiterr "'pk12util' not found. Abort."
}
check_container() {
in_container=0
export_dir=~/
if grep -qs "hwdsl2" /opt/src/run.sh; then
in_container=1
export_dir="/etc/ipsec.d/"
fi
}
check_ca_cert_exists() {
if certutil -L -d sql:/etc/ipsec.d -n "IKEv2 VPN CA" >/dev/null 2>&1; then
exiterr "Certificate 'IKEv2 VPN CA' already exists."
fi
}
check_server_cert_exists() {
if certutil -L -d sql:/etc/ipsec.d -n "$server_addr" >/dev/null 2>&1; then
echo "Error: Certificate '$server_addr' already exists." >&2
echo "Abort. No changes were made." >&2
exit 1
fi
}
check_client_cert_exists() {
if certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; then
echo "Error: Client '$client_name' already exists." >&2
echo "Abort. No changes were made." >&2
exit 1
fi
}
check_swan_install() {
ipsec_ver=$(/usr/local/sbin/ipsec --version 2>/dev/null)
swan_ver=$(printf '%s' "$ipsec_ver" | sed -e 's/Linux //' -e 's/Libreswan //' -e 's/ (netkey).*//')
if ( ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf && ! grep -qs "hwdsl2" /opt/src/run.sh ) \
|| ! printf '%s' "$ipsec_ver" | grep -q "Libreswan" \
|| [ ! -f /etc/ppp/chap-secrets ] || [ ! -f /etc/ipsec.d/passwd ]; then
cat 1>&2 <<'EOF'
Error: Your must first set up the IPsec VPN server before setting up IKEv2.
See: https://github.com/hwdsl2/setup-ipsec-vpn
EOF
exit 1
fi
case $swan_ver in
3.19|3.2[01235679]|3.3[12]|4.*)
/bin/true
;;
*)
cat 1>&2 <<EOF
Error: Libreswan version '$swan_ver' is not supported.
This script requires one of these versions:
3.19-3.23, 3.25-3.27, 3.29, 3.31-3.32 or 4.x
To update Libreswan, see:
https://github.com/hwdsl2/setup-ipsec-vpn#upgrade-libreswan
EOF
exit 1
;;
esac
}
check_swan_ver() {
if [ "$in_container" = "0" ]; then
swan_ver_url="https://dl.ls20.com/v1/$os_type/$os_ver/swanverikev2?arch=$os_arch&ver=$swan_ver&auto=$use_defaults"
else
swan_ver_url="https://dl.ls20.com/v1/docker/$os_arch/swanverikev2?ver=$swan_ver&auto=$use_defaults"
fi
swan_ver_latest=$(wget -t 3 -T 15 -qO- "$swan_ver_url")
}
select_swan_update() {
if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9])\.([0-9]|[1-9][0-9])$' \
&& [ "$swan_ver" != "$swan_ver_latest" ]; then
echo "Note: A newer version of Libreswan ($swan_ver_latest) is available."
echo "It is recommended to update Libreswan before setting up IKEv2."
if [ "$in_container" = "0" ]; then
echo "To update, exit this script and run:"
update_url=vpnupgrade
if [ "$os_type" = "centos" ] || [ "$os_type" = "rhel" ]; then
update_url=vpnupgrade-centos
elif [ "$os_type" = "amzn" ]; then
update_url=vpnupgrade-amzn
fi
echo " wget https://git.io/$update_url -O vpnupgrade.sh"
echo " sudo sh vpnupgrade.sh"
else
echo "To update this Docker image, see: https://git.io/updatedockervpn"
fi
echo
printf "Do you want to continue anyway? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
fi
}
show_welcome_message() {
clear
cat <<'EOF'
Welcome! Use this script to set up IKEv2 after setting up your own IPsec VPN server.
Alternatively, you may manually set up IKEv2. See: https://git.io/ikev2
I need to ask you a few questions before starting setup.
You can use the default options and just press enter if you are OK with them.
EOF
}
show_start_message() {
bigecho "Starting IKEv2 setup in auto mode, using default options."
}
get_server_ip() {
echo "Trying to auto discover IP of this server..."
public_ip=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
check_ip "$public_ip" || public_ip=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
}
get_server_address() {
server_addr=$(grep "leftcert=" /etc/ipsec.d/ikev2.conf | cut -f2 -d=)
[ -z "$server_addr" ] && server_addr=$(grep "leftcert=" /etc/ipsec.conf | cut -f2 -d=)
check_ip "$server_addr" || check_dns_name "$server_addr" || exiterr "Could not get VPN server address."
}
enter_server_address() {
echo "Do you want IKEv2 VPN clients to connect to this server using a DNS name,"
printf "e.g. vpn.example.com, instead of its IP address? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
use_dns_name=1
echo
;;
*)
use_dns_name=0
echo
;;
esac
if [ "$use_dns_name" = "1" ]; then
read -rp "Enter the DNS name of this VPN server: " server_addr
until check_dns_name "$server_addr"; do
echo "Invalid DNS name. You must enter a fully qualified domain name (FQDN)."
read -rp "Enter the DNS name of this VPN server: " server_addr
done
else
get_server_ip
echo
read -rp "Enter the IPv4 address of this VPN server: [$public_ip] " server_addr
[ -z "$server_addr" ] && server_addr="$public_ip"
until check_ip "$server_addr"; do
echo "Invalid IP address."
read -rp "Enter the IPv4 address of this VPN server: [$public_ip] " server_addr
[ -z "$server_addr" ] && server_addr="$public_ip"
done
fi
}
enter_client_name() {
echo
echo "Provide a name for the IKEv2 VPN client."
echo "Use one word only, no special characters except '-' and '_'."
read -rp "Client name: " client_name
while [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; do
if [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+'; then
echo "Invalid client name."
else
echo "Invalid client name. Client '$client_name' already exists."
fi
read -rp "Client name: " client_name
done
}
enter_client_name_with_defaults() {
echo
echo "Provide a name for the IKEv2 VPN client."
echo "Use one word only, no special characters except '-' and '_'."
read -rp "Client name: [vpnclient] " client_name
[ -z "$client_name" ] && client_name=vpnclient
while [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; do
if [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+'; then
echo "Invalid client name."
else
echo "Invalid client name. Client '$client_name' already exists."
fi
read -rp "Client name: [vpnclient] " client_name
[ -z "$client_name" ] && client_name=vpnclient
done
}
enter_client_name_for_export() {
echo
echo "Checking for existing IKEv2 client(s)..."
certutil -L -d sql:/etc/ipsec.d | grep -v -e '^$' -e 'IKEv2 VPN CA' -e '\.' | tail -n +3 | cut -f1 -d ' '
get_server_address
echo
read -rp "Enter the name of the IKEv2 client to export: " client_name
while [ -z "$client_name" ] || [ "${#client_name}" -gt "64" ] \
|| printf '%s' "$client_name" | LC_ALL=C grep -q '[^A-Za-z0-9_-]\+' \
|| [ "$client_name" = "IKEv2 VPN CA" ] || [ "$client_name" = "$server_addr" ] \
|| ! certutil -L -d sql:/etc/ipsec.d -n "$client_name" >/dev/null 2>&1; do
echo "Invalid client name, or client does not exist."
read -rp "Enter the name of the IKEv2 client to export: " client_name
done
}
enter_client_cert_validity() {
echo
echo "Specify the validity period (in months) for this VPN client certificate."
read -rp "Enter a number between 1 and 120: [120] " client_validity
[ -z "$client_validity" ] && client_validity=120
while printf '%s' "$client_validity" | LC_ALL=C grep -q '[^0-9]\+' \
|| [ "$client_validity" -lt "1" ] || [ "$client_validity" -gt "120" ] \
|| [ "$client_validity" != "$((10#$client_validity))" ]; do
echo "Invalid validity period."
read -rp "Enter a number between 1 and 120: [120] " client_validity
[ -z "$client_validity" ] && client_validity=120
done
}
enter_custom_dns() {
echo
echo "By default, clients are set to use Google Public DNS when the VPN is active."
printf "Do you want to specify custom DNS servers for IKEv2? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
use_custom_dns=1
;;
*)
use_custom_dns=0
dns_server_1=8.8.8.8
dns_server_2=8.8.4.4
dns_servers="8.8.8.8 8.8.4.4"
;;
esac
if [ "$use_custom_dns" = "1" ]; then
read -rp "Enter primary DNS server: " dns_server_1
until check_ip "$dns_server_1"; do
echo "Invalid DNS server."
read -rp "Enter primary DNS server: " dns_server_1
done
read -rp "Enter secondary DNS server (Enter to skip): " dns_server_2
until [ -z "$dns_server_2" ] || check_ip "$dns_server_2"; do
echo "Invalid DNS server."
read -rp "Enter secondary DNS server (Enter to skip): " dns_server_2
done
if [ -n "$dns_server_2" ]; then
dns_servers="$dns_server_1 $dns_server_2"
else
dns_servers="$dns_server_1"
fi
else
echo "Using Google Public DNS (8.8.8.8, 8.8.4.4)."
fi
}
check_mobike_support() {
mobike_support=0
case $swan_ver in
3.2[35679]|3.3[12]|4.*)
mobike_support=1
;;
esac
if uname -m | grep -qi -e '^arm' -e '^aarch64'; then
modprobe -q configs
if [ -f /proc/config.gz ]; then
if ! zcat /proc/config.gz | grep -q "CONFIG_XFRM_MIGRATE=y"; then
mobike_support=0
fi
else
mobike_support=0
fi
fi
kernel_conf="/boot/config-$(uname -r)"
if [ -f "$kernel_conf" ]; then
if ! grep -qs "CONFIG_XFRM_MIGRATE=y" "$kernel_conf"; then
mobike_support=0
fi
fi
# Linux kernels on Ubuntu do not support MOBIKE
if [ "$in_container" = "0" ]; then
if [ "$os_type" = "ubuntu" ] || uname -v | grep -qi ubuntu; then
mobike_support=0
fi
else
if uname -v | grep -qi ubuntu; then
mobike_support=0
fi
fi
echo
echo -n "Checking for MOBIKE support... "
if [ "$mobike_support" = "1" ]; then
echo "available"
else
echo "not available"
fi
}
select_mobike() {
mobike_enable=0
if [ "$mobike_support" = "1" ]; then
echo
echo "The MOBIKE IKEv2 extension allows VPN clients to change network attachment points,"
echo "e.g. switch between mobile data and Wi-Fi and keep the IPsec tunnel up on the new IP."
echo
printf "Do you want to enable MOBIKE support? [Y/n] "
read -r response
case $response in
[yY][eE][sS]|[yY]|'')
mobike_enable=1
;;
*)
mobike_enable=0
;;
esac
fi
}
select_p12_password() {
cat <<'EOF'
Client configuration will be exported as .p12, .sswan and .mobileconfig files,
which contain the client certificate, private key and CA certificate.
To protect these files, this script can generate a random password for you,
which will be displayed when finished.
EOF
printf "Do you want to specify your own password instead? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
use_own_password=1
;;
*)
use_own_password=0
;;
esac
}
select_menu_option() {
echo "It looks like IKEv2 has already been set up on this server."
echo
echo "Select an option:"
echo " 1) Add a new client"
echo " 2) Export configuration for an existing client"
echo " 3) Remove IKEv2"
echo " 4) Exit"
read -rp "Option: " selected_option
until [[ "$selected_option" =~ ^[1-4]$ ]]; do
printf '%s\n' "$selected_option: invalid selection."
read -rp "Option: " selected_option
done
}
confirm_setup_options() {
cat <<EOF
Below are the IKEv2 setup options you selected.
Please double check before continuing!
================================================
VPN server address: $server_addr
VPN client name: $client_name
EOF
if [ "$client_validity" = "1" ]; then
echo "Client cert valid for: 1 month"
else
echo "Client cert valid for: $client_validity months"
fi
if [ "$mobike_support" = "1" ]; then
if [ "$mobike_enable" = "1" ]; then
echo "MOBIKE support: Enable"
else
echo "MOBIKE support: Disable"
fi
else
echo "MOBIKE support: Not available"
fi
cat <<EOF
DNS server(s): $dns_servers
================================================
EOF
printf "We are ready to set up IKEv2 now. Do you want to continue? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
}
create_client_cert() {
bigecho2 "Generating client certificate..."
sleep $((RANDOM % 3 + 1))
certutil -z <(head -c 1024 /dev/urandom) \
-S -c "IKEv2 VPN CA" -n "$client_name" \
-s "O=IKEv2 VPN,CN=$client_name" \
-k rsa -g 4096 -v "$client_validity" \
-d sql:/etc/ipsec.d -t ",," \
--keyUsage digitalSignature,keyEncipherment \
--extKeyUsage serverAuth,clientAuth -8 "$client_name" >/dev/null || exit 1
}
export_p12_file() {
bigecho "Exporting .p12 file..."
if [ "$use_own_password" = "1" ]; then
cat <<'EOF'
Enter a *secure* password to protect the client configuration files.
When importing into an iOS or macOS device, this password cannot be empty.
EOF
else
p12_password=$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)
[ -z "$p12_password" ] && exiterr "Could not generate a random password for .p12 file."
fi
if [ "$use_own_password" = "1" ]; then
pk12util -d sql:/etc/ipsec.d -n "$client_name" -o "$export_dir$client_name-$SYS_DT.p12" || exit 1
else
pk12util -W "$p12_password" -d sql:/etc/ipsec.d -n "$client_name" -o "$export_dir$client_name-$SYS_DT.p12" || exit 1
fi
}
install_base64_uuidgen() {
if ! command -v base64 >/dev/null 2>&1 || ! command -v uuidgen >/dev/null 2>&1; then
if [ "$os_type" = "ubuntu" ] || [ "$os_type" = "debian" ] || [ "$os_type" = "raspbian" ]; then
export DEBIAN_FRONTEND=noninteractive
apt-get -yqq update || exiterr "'apt-get update' failed."
apt-get -yqq install coreutils uuid-runtime || exiterr "'apt-get install' failed."
else
yum -yq install coreutils util-linux || exiterr "'yum install' failed."
fi
fi
}
create_mobileconfig() {
bigecho "Creating .mobileconfig for iOS and macOS..."
install_base64_uuidgen
[ -z "$server_addr" ] && get_server_address
p12_base64=$(base64 -w 52 "$export_dir$client_name-$SYS_DT.p12")
[ -z "$p12_base64" ] && exiterr "Could not encode .p12 file."
ca_base64=$(certutil -L -d sql:/etc/ipsec.d -n "IKEv2 VPN CA" -a | grep -v CERTIFICATE)
[ -z "$ca_base64" ] && exiterr "Could not encode IKEv2 VPN CA certificate."
uuid1=$(uuidgen)
[ -z "$uuid1" ] && exiterr "Could not generate UUID value."
mc_file="$export_dir$client_name-$SYS_DT.mobileconfig"
cat > "$mc_file" <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>PayloadContent</key>
<array>
<dict>
<key>IKEv2</key>
<dict>
<key>AuthenticationMethod</key>
<string>Certificate</string>
<key>ChildSecurityAssociationParameters</key>
<dict>
<key>DiffieHellmanGroup</key>
<integer>14</integer>
<key>EncryptionAlgorithm</key>
<string>AES-256-GCM</string>
<key>LifeTimeInMinutes</key>
<integer>1410</integer>
</dict>
<key>DeadPeerDetectionRate</key>
<string>Medium</string>
<key>DisableRedirect</key>
<true/>
<key>EnableCertificateRevocationCheck</key>
<integer>0</integer>
<key>EnablePFS</key>
<integer>0</integer>
<key>IKESecurityAssociationParameters</key>
<dict>
<key>DiffieHellmanGroup</key>
<integer>14</integer>
<key>EncryptionAlgorithm</key>
<string>AES-256</string>
<key>IntegrityAlgorithm</key>
<string>SHA2-256</string>
<key>LifeTimeInMinutes</key>
<integer>1410</integer>
</dict>
<key>LocalIdentifier</key>
<string>$client_name</string>
<key>PayloadCertificateUUID</key>
<string>$uuid1</string>
<key>OnDemandEnabled</key>
<integer>0</integer>
<key>OnDemandRules</key>
<array>
<dict>
<key>Action</key>
<string>Connect</string>
</dict>
</array>
<key>RemoteAddress</key>
<string>$server_addr</string>
<key>RemoteIdentifier</key>
<string>$server_addr</string>
<key>UseConfigurationAttributeInternalIPSubnet</key>
<integer>0</integer>
</dict>
<key>IPv4</key>
<dict>
<key>OverridePrimary</key>
<integer>1</integer>
</dict>
<key>PayloadDescription</key>
<string>Configures VPN settings</string>
<key>PayloadDisplayName</key>
<string>VPN</string>
<key>PayloadIdentifier</key>
<string>com.apple.vpn.managed.$(uuidgen)</string>
<key>PayloadType</key>
<string>com.apple.vpn.managed</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
<key>Proxies</key>
<dict>
<key>HTTPEnable</key>
<integer>0</integer>
<key>HTTPSEnable</key>
<integer>0</integer>
</dict>
<key>UserDefinedName</key>
<string>$server_addr</string>
<key>VPNType</key>
<string>IKEv2</string>
</dict>
<dict>
<key>PayloadCertificateFileName</key>
<string>$client_name</string>
<key>PayloadContent</key>
<data>
$p12_base64
</data>
<key>PayloadDescription</key>
<string>Adds a PKCS#12-formatted certificate</string>
<key>PayloadDisplayName</key>
<string>$client_name</string>
<key>PayloadIdentifier</key>
<string>com.apple.security.pkcs12.$(uuidgen)</string>
<key>PayloadType</key>
<string>com.apple.security.pkcs12</string>
<key>PayloadUUID</key>
<string>$uuid1</string>
<key>PayloadVersion</key>
<integer>1</integer>
</dict>
<dict>
<key>PayloadContent</key>
<data>
$ca_base64
</data>
<key>PayloadCertificateFileName</key>
<string>ikev2vpnca</string>
<key>PayloadDescription</key>
<string>Adds a CA root certificate</string>
<key>PayloadDisplayName</key>
<string>Certificate Authority (CA)</string>
<key>PayloadIdentifier</key>
<string>com.apple.security.root.$(uuidgen)</string>
<key>PayloadType</key>
<string>com.apple.security.root</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
</dict>
</array>
<key>PayloadDisplayName</key>
<string>IKEv2 VPN configuration ($server_addr)</string>
<key>PayloadIdentifier</key>
<string>com.apple.vpn.managed.$(uuidgen)</string>
<key>PayloadRemovalDisallowed</key>
<false/>
<key>PayloadType</key>
<string>Configuration</string>
<key>PayloadUUID</key>
<string>$(uuidgen)</string>
<key>PayloadVersion</key>
<integer>1</integer>
</dict>
</plist>
EOF
chmod 600 "$mc_file"
}
create_android_profile() {
bigecho "Creating client profile for Android..."
install_base64_uuidgen
[ -z "$server_addr" ] && get_server_address
p12_base64_oneline=$(base64 -w 52 "$export_dir$client_name-$SYS_DT.p12" | sed 's/$/\\n/' | tr -d '\n')
[ -z "$p12_base64_oneline" ] && exiterr "Could not encode .p12 file."
uuid2=$(uuidgen)
[ -z "$uuid2" ] && exiterr "Could not generate UUID value."
sswan_file="$export_dir$client_name-$SYS_DT.sswan"
cat > "$sswan_file" <<EOF
{
"uuid": "$uuid2",
"name": "IKEv2 VPN profile ($server_addr)",
"type": "ikev2-cert",
"remote": {
"addr": "$server_addr"
},
"local": {
"p12": "$p12_base64_oneline",
"rsa-pss": "true"
},
"ike-proposal": "aes256-sha256-modp2048",
"esp-proposal": "aes256gcm16"
}
EOF
chmod 600 "$sswan_file"
}
create_ca_cert() {
bigecho2 "Generating CA certificate..."
certutil -z <(head -c 1024 /dev/urandom) \
-S -x -n "IKEv2 VPN CA" \
-s "O=IKEv2 VPN,CN=IKEv2 VPN CA" \
-k rsa -g 4096 -v 120 \
-d sql:/etc/ipsec.d -t "CT,," -2 >/dev/null <<ANSWERS || exit 1
y
N
ANSWERS
}
create_server_cert() {
bigecho2 "Generating VPN server certificate..."
sleep $((RANDOM % 3 + 1))
if [ "$use_dns_name" = "1" ]; then
certutil -z <(head -c 1024 /dev/urandom) \
-S -c "IKEv2 VPN CA" -n "$server_addr" \
-s "O=IKEv2 VPN,CN=$server_addr" \
-k rsa -g 4096 -v 120 \
-d sql:/etc/ipsec.d -t ",," \
--keyUsage digitalSignature,keyEncipherment \
--extKeyUsage serverAuth \
--extSAN "dns:$server_addr" >/dev/null || exit 1
else
certutil -z <(head -c 1024 /dev/urandom) \
-S -c "IKEv2 VPN CA" -n "$server_addr" \
-s "O=IKEv2 VPN,CN=$server_addr" \
-k rsa -g 4096 -v 120 \
-d sql:/etc/ipsec.d -t ",," \
--keyUsage digitalSignature,keyEncipherment \
--extKeyUsage serverAuth \
--extSAN "ip:$server_addr,dns:$server_addr" >/dev/null || exit 1
fi
}
add_ikev2_connection() {
bigecho "Adding a new IKEv2 connection..."
if ! grep -qs '^include /etc/ipsec\.d/\*\.conf$' /etc/ipsec.conf; then
echo >> /etc/ipsec.conf
echo 'include /etc/ipsec.d/*.conf' >> /etc/ipsec.conf
fi
cat > /etc/ipsec.d/ikev2.conf <<EOF
conn ikev2-cp
left=%defaultroute
leftcert=$server_addr
leftid=@$server_addr
leftsendcert=always
leftsubnet=0.0.0.0/0
leftrsasigkey=%cert
right=%any
rightid=%fromcert
rightaddresspool=192.168.43.10-192.168.43.250
rightca=%same
rightrsasigkey=%cert
narrowing=yes
dpddelay=30
dpdtimeout=120
dpdaction=clear
auto=add
ikev2=insist
rekey=no
pfs=no
fragmentation=yes
ike=aes256-sha2,aes128-sha2,aes256-sha1,aes128-sha1,aes256-sha2;modp1024,aes128-sha1;modp1024
phase2alg=aes_gcm-null,aes128-sha1,aes256-sha1,aes128-sha2,aes256-sha2
ikelifetime=24h
salifetime=24h
encapsulation=yes
EOF
case $swan_ver in
3.2[35679]|3.3[12]|4.*)
if [ -n "$dns_server_2" ]; then
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns="$dns_servers"
EOF
else
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns=$dns_server_1
EOF
fi
if [ "$mobike_enable" = "1" ]; then
echo " mobike=yes" >> /etc/ipsec.d/ikev2.conf
else
echo " mobike=no" >> /etc/ipsec.d/ikev2.conf
fi
;;
3.19|3.2[012])
if [ -n "$dns_server_2" ]; then
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns1=$dns_server_1
modecfgdns2=$dns_server_2
EOF
else
cat >> /etc/ipsec.d/ikev2.conf <<EOF
modecfgdns1=$dns_server_1
EOF
fi
;;
esac
}
apply_ubuntu1804_nss_fix() {
if [ "$os_type" = "ubuntu" ] && [ "$os_ver" = "bustersid" ] && [ "$os_arch" = "x86_64" ]; then
bigecho "Applying fix for NSS bug on Ubuntu 18.04..."
nss_url1="https://mirrors.kernel.org/ubuntu/pool/main/n/nss"
nss_url2="https://mirrors.kernel.org/ubuntu/pool/universe/n/nss"
nss_deb1="libnss3_3.49.1-1ubuntu1.5_amd64.deb"
nss_deb2="libnss3-dev_3.49.1-1ubuntu1.5_amd64.deb"
nss_deb3="libnss3-tools_3.49.1-1ubuntu1.5_amd64.deb"
if wget -t 3 -T 30 -nv -O "/tmp/$nss_deb1" "$nss_url1/$nss_deb1" \
&& wget -t 3 -T 30 -nv -O "/tmp/$nss_deb2" "$nss_url1/$nss_deb2" \
&& wget -t 3 -T 30 -nv -O "/tmp/$nss_deb3" "$nss_url2/$nss_deb3"; then
export DEBIAN_FRONTEND=noninteractive
apt-get -yqq update
apt-get -yqq install "/tmp/$nss_deb1" "/tmp/$nss_deb2" "/tmp/$nss_deb3"
fi
/bin/rm -f "/tmp/$nss_deb1" "/tmp/$nss_deb2" "/tmp/$nss_deb3"
fi
}
restart_ipsec_service() {
bigecho "Restarting IPsec service..."
mkdir -p /run/pluto
service ipsec restart
}
print_client_added_message() {
cat <<EOF
===============================================================
New IKEv2 VPN client "$client_name" added!
VPN server address: $server_addr
VPN client name: $client_name
EOF
}
print_client_exported_message() {
cat <<EOF
===============================================================
IKEv2 VPN client "$client_name" configuration exported!
VPN server address: $server_addr
VPN client name: $client_name
EOF
}
show_swan_update_info() {
if printf '%s' "$swan_ver_latest" | grep -Eq '^([3-9]|[1-9][0-9])\.([0-9]|[1-9][0-9])$' \
&& [ "$swan_ver" != "$swan_ver_latest" ]; then
echo
echo "Note: A newer version of Libreswan ($swan_ver_latest) is available."
if [ "$in_container" = "0" ]; then
echo "To update to the new version, run:"
update_url=vpnupgrade
if [ "$os_type" = "centos" ] || [ "$os_type" = "rhel" ]; then
update_url=vpnupgrade-centos
elif [ "$os_type" = "amzn" ]; then
update_url=vpnupgrade-amzn
fi
echo " wget https://git.io/$update_url -O vpnupgrade.sh"
echo " sudo sh vpnupgrade.sh"
else
echo "To update this Docker image, see: https://git.io/updatedockervpn"
fi
fi
}
print_setup_complete_message() {
cat <<EOF
===============================================================
IKEv2 VPN setup is now complete!
VPN server address: $server_addr
VPN client name: $client_name
EOF
}
print_client_info() {
cat <<EOF
Client configuration is available at:
$export_dir$client_name-$SYS_DT.p12 (for Windows)
$export_dir$client_name-$SYS_DT.sswan (for Android)
$export_dir$client_name-$SYS_DT.mobileconfig (for iOS & macOS)
EOF
if [ "$use_own_password" = "0" ]; then
cat <<EOF
*IMPORTANT* Password for client config files:
$p12_password
Write this down, you'll need it to import to your device!
EOF
fi
cat <<'EOF'
Next steps: Configure IKEv2 VPN clients. See:
https://git.io/ikev2clients
To add more IKEv2 VPN clients, run this script again.
===============================================================
EOF
}
check_ipsec_conf() {
if grep -qs "conn ikev2-cp" /etc/ipsec.conf; then
echo "Error: IKEv2 configuration section found in /etc/ipsec.conf." >&2
echo "This script cannot automatically remove IKEv2 from this server." >&2
echo "To manually remove IKEv2, see https://git.io/ikev2" >&2
echo "Abort. No changes were made." >&2
exit 1
fi
}
confirm_remove_ikev2() {
echo
echo "This option will remove IKEv2 from the VPN server, but keep the IPsec/L2TP"
echo "and IPsec/XAuth (\"Cisco IPsec\") modes. All IKEv2 configuration including"
echo "certificates will be permanently deleted. This *cannot be undone*!"
echo
printf "Are you sure you want to remove IKEv2? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
echo
;;
*)
echo "Abort. No changes were made."
exit 1
;;
esac
}
delete_ikev2_conf() {
bigecho2 "Deleting /etc/ipsec.d/ikev2.conf..."
/bin/rm -f /etc/ipsec.d/ikev2.conf
}
delete_certificates() {
bigecho "Deleting certificates from the IPsec database..."
certutil -L -d sql:/etc/ipsec.d | grep -v -e '^$' -e 'IKEv2 VPN CA' | tail -n +3 | cut -f1 -d ' ' | while read -r line; do
certutil -F -d sql:/etc/ipsec.d -n "$line"
certutil -D -d sql:/etc/ipsec.d -n "$line" 2>/dev/null
done
certutil -F -d sql:/etc/ipsec.d -n "IKEv2 VPN CA"
certutil -D -d sql:/etc/ipsec.d -n "IKEv2 VPN CA" 2>/dev/null
}
print_ikev2_removed_message() {
echo "IKEv2 removed!"
}
ikev2setup() {
case $1 in
--auto)
use_defaults=1
;;
*)
use_defaults=0
;;
esac
check_run_as_root
check_os_type
check_swan_install
check_utils_exist
check_container
if grep -qs "conn ikev2-cp" /etc/ipsec.conf || [ -f /etc/ipsec.d/ikev2.conf ]; then
select_menu_option
case $selected_option in
1)
enter_client_name
enter_client_cert_validity
select_p12_password
create_client_cert
export_p12_file
create_mobileconfig
create_android_profile
print_client_added_message
print_client_info
exit 0
;;
2)
enter_client_name_for_export
select_p12_password
export_p12_file
create_mobileconfig
create_android_profile
print_client_exported_message
print_client_info
exit 0
;;
3)
check_ipsec_conf
confirm_remove_ikev2
delete_ikev2_conf
restart_ipsec_service
delete_certificates
print_ikev2_removed_message
exit 0
;;
4)
exit 0
;;
esac
fi
check_ca_cert_exists
check_swan_ver
if [ "$use_defaults" = "0" ]; then
select_swan_update
show_welcome_message
enter_server_address
check_server_cert_exists
enter_client_name_with_defaults
enter_client_cert_validity
enter_custom_dns
check_mobike_support
select_mobike
select_p12_password
confirm_setup_options
else
show_start_message
use_dns_name=0
get_server_ip
check_ip "$public_ip" || exiterr "Cannot detect this server's public IP."
server_addr="$public_ip"
check_server_cert_exists
client_name=vpnclient
check_client_cert_exists
client_validity=120
use_custom_dns=0
dns_server_1=8.8.8.8
dns_server_2=8.8.4.4
dns_servers="8.8.8.8 8.8.4.4"
check_mobike_support
mobike_enable="$mobike_support"
use_own_password=0
fi
apply_ubuntu1804_nss_fix
create_ca_cert
create_server_cert
create_client_cert
export_p12_file
create_mobileconfig
create_android_profile
add_ikev2_connection
restart_ipsec_service
if [ "$use_defaults" = "1" ]; then
show_swan_update_info
fi
print_setup_complete_message
print_client_info
}
## Defer setup until we have the complete script
ikev2setup "$@"
exit 0
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