180 lines
4.9 KiB
Bash
Executable File
180 lines
4.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Script to update VPN users for both IPsec/L2TP and Cisco IPsec
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#
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# Copyright (C) 2018-2021 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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# =====================================================
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# Define your own values for these variables
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# - List of VPN usernames and passwords, separated by spaces
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# - All values MUST be placed inside 'single quotes'
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# - DO NOT use these special characters within values: \ " '
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YOUR_USERNAMES=''
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YOUR_PASSWORDS=''
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# Example:
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# YOUR_USERNAMES='username1 username2'
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# YOUR_PASSWORDS='password1 password2'
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# WARNING: *ALL* existing VPN users will be removed
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# and replaced with the users listed here.
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# =====================================================
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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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onespace() { printf '%s' "$1" | tr -s ' '; }
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noquotes() { printf '%s' "$1" | sed -e 's/^"\(.*\)"$/\1/' -e "s/^'\(.*\)'$/\1/"; }
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noquotes2() { printf '%s' "$1" | sed -e 's/" "/ /g' -e "s/' '/ /g"; }
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update_vpn_users() {
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if [ "$(id -u)" != 0 ]; then
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exiterr "Script must be run as root. Try 'sudo sh $0'"
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fi
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if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf \
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|| [ ! -f /etc/ppp/chap-secrets ] || [ ! -f /etc/ipsec.d/passwd ]; then
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cat 1>&2 <<'EOF'
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Error: Your must first set up the IPsec VPN server before updating VPN users.
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See: https://github.com/hwdsl2/setup-ipsec-vpn
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EOF
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exit 1
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fi
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command -v openssl >/dev/null 2>&1 || exiterr "'openssl' not found. Abort."
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[ -n "$YOUR_USERNAMES" ] && VPN_USERS="$YOUR_USERNAMES"
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[ -n "$YOUR_PASSWORDS" ] && VPN_PASSWORDS="$YOUR_PASSWORDS"
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VPN_USERS=$(noquotes "$VPN_USERS")
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VPN_USERS=$(onespace "$VPN_USERS")
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VPN_USERS=$(noquotes2 "$VPN_USERS")
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VPN_PASSWORDS=$(noquotes "$VPN_PASSWORDS")
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VPN_PASSWORDS=$(onespace "$VPN_PASSWORDS")
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VPN_PASSWORDS=$(noquotes2 "$VPN_PASSWORDS")
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if [ -z "$VPN_USERS" ] || [ -z "$VPN_PASSWORDS" ]; then
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exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
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fi
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if printf '%s' "$VPN_USERS $VPN_PASSWORDS" | LC_ALL=C grep -q '[^ -~]\+'; then
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exiterr "VPN credentials must not contain non-ASCII characters."
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fi
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case "$VPN_USERS $VPN_PASSWORDS" in
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*[\\\"\']*)
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exiterr "VPN credentials must not contain these special characters: \\ \" '"
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;;
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esac
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if printf '%s' "$VPN_USERS" | tr ' ' '\n' | sort | uniq -c | grep -qv '^ *1 '; then
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exiterr "VPN usernames must not contain duplicates."
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fi
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clear
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cat <<'EOF'
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Welcome! This script will update VPN user accounts for both
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IPsec/L2TP and IPsec/XAuth ("Cisco IPsec") modes.
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WARNING: *ALL* existing VPN users will be removed and replaced
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with the users listed below.
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Please double check before continuing!
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==================================================
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Updated list of VPN users (username | password):
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EOF
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count=1
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vpn_user=$(printf '%s' "$VPN_USERS" | cut -d ' ' -f 1)
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vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -d ' ' -f 1)
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while [ -n "$vpn_user" ] && [ -n "$vpn_password" ]; do
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cat <<EOF
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$vpn_user | $vpn_password
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EOF
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count=$((count+1))
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vpn_user=$(printf '%s' "$VPN_USERS" | cut -s -d ' ' -f "$count")
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vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -s -d ' ' -f "$count")
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done
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cat <<'EOF'
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Write these down. You'll need them to connect!
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Important notes: https://git.io/vpnnotes
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Setup VPN clients: https://git.io/vpnclients
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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 $response in
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[yY][eE][sS]|[yY])
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echo
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echo "Updating VPN users..."
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echo
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;;
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*)
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echo "Abort. No changes were made."
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exit 1
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;;
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esac
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# Backup and remove config files
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conf_bk "/etc/ppp/chap-secrets"
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conf_bk "/etc/ipsec.d/passwd"
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/bin/rm -f /etc/ppp/chap-secrets /etc/ipsec.d/passwd
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# Update VPN users
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count=1
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vpn_user=$(printf '%s' "$VPN_USERS" | cut -d ' ' -f 1)
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vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -d ' ' -f 1)
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while [ -n "$vpn_user" ] && [ -n "$vpn_password" ]; do
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vpn_password_enc=$(openssl passwd -1 "$vpn_password")
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cat >> /etc/ppp/chap-secrets <<EOF
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"$vpn_user" l2tpd "$vpn_password" *
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EOF
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cat >> /etc/ipsec.d/passwd <<EOF
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$vpn_user:$vpn_password_enc:xauth-psk
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EOF
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count=$((count+1))
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vpn_user=$(printf '%s' "$VPN_USERS" | cut -s -d ' ' -f "$count")
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vpn_password=$(printf '%s' "$VPN_PASSWORDS" | cut -s -d ' ' -f "$count")
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done
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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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update_vpn_users "$@"
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exit 0
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