140 lines
3.8 KiB
Bash
Executable File
140 lines
3.8 KiB
Bash
Executable File
#!/bin/bash
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#
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# Script to add/update a VPN user for both IPsec/L2TP and Cisco IPsec
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#
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# Copyright (C) 2018-2024 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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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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exiterr() { echo "Error: $1" >&2; exit 1; }
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conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
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show_intro() {
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cat <<'EOF'
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Welcome! Use this script to add or update a VPN user account for both
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IPsec/L2TP and IPsec/XAuth ("Cisco IPsec") modes.
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If the username you specify already exists, it will be updated
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with the new password. Otherwise, a new VPN user will be added.
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EOF
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}
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add_vpn_user() {
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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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if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf \
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|| [ ! -f /etc/ppp/chap-secrets ] || [ ! -f /etc/ipsec.d/passwd ]; then
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cat 1>&2 <<'EOF'
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Error: Your must first set up the IPsec VPN server before adding VPN users.
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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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command -v openssl >/dev/null 2>&1 || exiterr "'openssl' not found. Abort."
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if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
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cat 1>&2 <<EOF
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Usage: sudo bash $0 'username_to_add' 'password'
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sudo bash $0 'username_to_update' 'new_password'
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You may also run this script interactively without arguments.
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EOF
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exit 1
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fi
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VPN_USER=$1
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VPN_PASSWORD=$2
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if [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
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show_intro
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echo
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echo "List of existing VPN usernames:"
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cut -f1 -d : /etc/ipsec.d/passwd | LC_ALL=C sort
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echo
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echo "Enter the VPN username you want to add or update."
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read -rp "Username: " VPN_USER
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if [ -z "$VPN_USER" ]; then
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echo "Abort. No changes were made." >&2
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exit 1
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fi
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read -rp "Password: " VPN_PASSWORD
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if [ -z "$VPN_PASSWORD" ]; then
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echo "Abort. No changes were made." >&2
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exit 1
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fi
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fi
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if printf '%s' "$VPN_USER $VPN_PASSWORD" | LC_ALL=C grep -q '[^ -~]\+'; then
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exiterr "VPN credentials must not contain non-ASCII characters."
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fi
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case "$VPN_USER $VPN_PASSWORD" in
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*[\\\"\']*)
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exiterr "VPN credentials must not contain these special characters: \\ \" '"
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;;
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esac
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if [ -n "$1" ] && [ -n "$2" ]; then
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show_intro
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fi
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cat <<EOF
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================================================
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VPN user to add or update:
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Username: $VPN_USER
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Password: $VPN_PASSWORD
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Write these down. You'll need them to connect!
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VPN client setup: https://vpnsetup.net/clients
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================================================
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EOF
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printf "Do you want to continue? [Y/n] "
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read -r response
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case $response in
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[yY][eE][sS]|[yY]|'')
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echo
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echo "Adding or updating VPN user..."
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echo
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;;
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*)
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echo "Abort. No changes were made."
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exit 1
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;;
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esac
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# Backup config files
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conf_bk "/etc/ppp/chap-secrets"
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conf_bk "/etc/ipsec.d/passwd"
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# Add or update VPN user
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sed -i "/^\"$VPN_USER\" /d" /etc/ppp/chap-secrets
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cat >> /etc/ppp/chap-secrets <<EOF
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"$VPN_USER" l2tpd "$VPN_PASSWORD" *
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EOF
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# shellcheck disable=SC2016
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sed -i '/^'"$VPN_USER"':\$1\$/d' /etc/ipsec.d/passwd
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VPN_PASSWORD_ENC=$(openssl passwd -1 "$VPN_PASSWORD")
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cat >> /etc/ipsec.d/passwd <<EOF
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$VPN_USER:$VPN_PASSWORD_ENC:xauth-psk
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EOF
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# Update file attributes
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chmod 600 /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
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cat <<'EOF'
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Done!
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Note: All VPN users will share the same IPsec PSK.
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If you forgot the PSK, check /etc/ipsec.secrets.
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EOF
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}
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## Defer until we have the complete script
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add_vpn_user "$@"
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exit 0
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