mirror of https://gitlab.com/fscarmen/test.git
fscarmen
3 years ago
committed by
GitHub
parent
2cba057d1b
commit
1e70373be7
@ -0,0 +1,390 @@ |
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#!/bin/bash |
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# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. |
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# |
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|
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set -e -o pipefail |
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shopt -s extglob |
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export LC_ALL=C |
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|
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SELF="$(readlink -f "${BASH_SOURCE[0]}")" |
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export PATH="${SELF%/*}:$PATH" |
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|
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WG_CONFIG="" |
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INTERFACE="" |
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ADDRESSES=( ) |
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MTU="" |
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DNS=( ) |
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DNS_SEARCH=( ) |
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TABLE="" |
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PRE_UP=( ) |
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POST_UP=( ) |
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PRE_DOWN=( ) |
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POST_DOWN=( ) |
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SAVE_CONFIG=0 |
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CONFIG_FILE="" |
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PROGRAM="${0##*/}" |
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ARGS=( "$@" ) |
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|
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cmd() { |
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echo "[#] $*" >&2 |
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"$@" |
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} |
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|
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die() { |
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echo "$PROGRAM: $*" >&2 |
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exit 1 |
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} |
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|
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parse_options() { |
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local interface_section=0 line key value stripped v |
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CONFIG_FILE="$1" |
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[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf" |
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[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist" |
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[[ $CONFIG_FILE =~ (^|/)([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf" |
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CONFIG_FILE="$(readlink -f "$CONFIG_FILE")" |
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((($(stat -c '0%#a' "$CONFIG_FILE") & $(stat -c '0%#a' "${CONFIG_FILE%/*}") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2 |
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INTERFACE="${BASH_REMATCH[2]}" |
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shopt -s nocasematch |
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while read -r line || [[ -n $line ]]; do |
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stripped="${line%%\#*}" |
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key="${stripped%%=*}"; key="${key##*([[:space:]])}"; key="${key%%*([[:space:]])}" |
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value="${stripped#*=}"; value="${value##*([[:space:]])}"; value="${value%%*([[:space:]])}" |
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[[ $key == "["* ]] && interface_section=0 |
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[[ $key == "[Interface]" ]] && interface_section=1 |
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if [[ $interface_section -eq 1 ]]; then |
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case "$key" in |
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Address) ADDRESSES+=( ${value//,/ } ); continue ;; |
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MTU) MTU="$value"; continue ;; |
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DNS) for v in ${value//,/ }; do |
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[[ $v =~ (^[0-9.]+$)|(^.*:.*$) ]] && DNS+=( $v ) || DNS_SEARCH+=( $v ) |
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done; continue ;; |
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Table) TABLE="$value"; continue ;; |
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PreUp) PRE_UP+=( "$value" ); continue ;; |
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PreDown) PRE_DOWN+=( "$value" ); continue ;; |
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PostUp) POST_UP+=( "$value" ); continue ;; |
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PostDown) POST_DOWN+=( "$value" ); continue ;; |
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SaveConfig) read_bool SAVE_CONFIG "$value"; continue ;; |
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esac |
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fi |
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WG_CONFIG+="$line"$'\n' |
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done < "$CONFIG_FILE" |
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shopt -u nocasematch |
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} |
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|
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read_bool() { |
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case "$2" in |
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true) printf -v "$1" 1 ;; |
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false) printf -v "$1" 0 ;; |
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*) die "\`$2' is neither true nor false" |
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esac |
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} |
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|
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auto_su() { |
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[[ $UID == 0 ]] || exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " -- "$BASH" -- "$SELF" "${ARGS[@]}" |
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} |
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|
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add_if() { |
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local ret |
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if ! cmd ip link add "$INTERFACE" type wireguard; then |
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ret=$? |
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[[ ! -e /sys/module/wireguard ]] || ! command -v "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" >/dev/null && exit $ret |
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echo "[!] Missing WireGuard kernel module. Falling back to slow userspace implementation." >&2 |
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cmd "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" "$INTERFACE" |
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fi |
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} |
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|
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del_if() { |
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local table |
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[[ $HAVE_SET_DNS -eq 0 ]] || unset_dns |
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[[ $HAVE_SET_FIREWALL -eq 0 ]] || remove_firewall |
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if [[ -z $TABLE || $TABLE == auto ]] && get_fwmark table && [[ $(wg show "$INTERFACE" allowed-ips) =~ /0(\ |$'\n'|$) ]]; then |
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while [[ $(ip -4 rule show 2>/dev/null) == *"lookup $table"* ]]; do |
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cmd ip -4 rule delete table $table |
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done |
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while [[ $(ip -4 rule show 2>/dev/null) == *"from all lookup main suppress_prefixlength 0"* ]]; do |
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cmd ip -4 rule delete table main suppress_prefixlength 0 |
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done |
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while [[ $(ip -6 rule show 2>/dev/null) == *"lookup $table"* ]]; do |
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cmd ip -6 rule delete table $table |
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done |
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while [[ $(ip -6 rule show 2>/dev/null) == *"from all lookup main suppress_prefixlength 0"* ]]; do |
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cmd ip -6 rule delete table main suppress_prefixlength 0 |
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done |
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fi |
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cmd ip link delete dev "$INTERFACE" |
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} |
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add_addr() { |
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local proto=-4 |
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[[ $1 == *:* ]] && proto=-6 |
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cmd ip $proto address add "$1" dev "$INTERFACE" |
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} |
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|
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set_mtu_up() { |
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local mtu=0 endpoint output |
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if [[ -n $MTU ]]; then |
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cmd ip link set mtu "$MTU" up dev "$INTERFACE" |
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return |
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fi |
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while read -r _ endpoint; do |
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[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue |
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output="$(ip route get "${BASH_REMATCH[1]}" || true)" |
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}" |
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done < <(wg show "$INTERFACE" endpoints) |
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if [[ $mtu -eq 0 ]]; then |
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read -r output < <(ip route show default || true) || true |
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}" |
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fi |
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[[ $mtu -gt 0 ]] || mtu=1500 |
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cmd ip link set mtu $(( mtu - 80 )) up dev "$INTERFACE" |
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} |
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|
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resolvconf_iface_prefix() { |
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[[ -f /etc/resolvconf/interface-order ]] || return 0 |
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local iface |
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while read -r iface; do |
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[[ $iface =~ ^([A-Za-z0-9-]+)\*$ ]] || continue |
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echo "${BASH_REMATCH[1]}." && return 0 |
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done < /etc/resolvconf/interface-order |
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} |
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HAVE_SET_DNS=0 |
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set_dns() { |
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[[ ${#DNS[@]} -gt 0 ]] || return 0 |
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{ printf 'nameserver %s\n' "${DNS[@]}" |
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[[ ${#DNS_SEARCH[@]} -eq 0 ]] || printf 'search %s\n' "${DNS_SEARCH[*]}" |
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} | cmd resolvconf -a "$(resolvconf_iface_prefix)$INTERFACE" -m 0 -x |
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HAVE_SET_DNS=1 |
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} |
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unset_dns() { |
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[[ ${#DNS[@]} -gt 0 ]] || return 0 |
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cmd resolvconf -d "$(resolvconf_iface_prefix)$INTERFACE" -f |
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} |
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add_route() { |
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local proto=-4 |
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[[ $1 == *:* ]] && proto=-6 |
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[[ $TABLE != off ]] || return 0 |
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if [[ -n $TABLE && $TABLE != auto ]]; then |
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cmd ip $proto route add "$1" dev "$INTERFACE" table "$TABLE" |
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elif [[ $1 == */0 ]]; then |
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add_default "$1" |
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else |
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[[ -n $(ip $proto route show dev "$INTERFACE" match "$1" 2>/dev/null) ]] || cmd ip $proto route add "$1" dev "$INTERFACE" |
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fi |
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} |
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get_fwmark() { |
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local fwmark |
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fwmark="$(wg show "$INTERFACE" fwmark)" || return 1 |
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[[ -n $fwmark && $fwmark != off ]] || return 1 |
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printf -v "$1" "%d" "$fwmark" |
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return 0 |
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} |
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remove_firewall() { |
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if type -p nft >/dev/null; then |
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local table nftcmd |
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while read -r table; do |
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[[ $table == *" wg-quick-$INTERFACE" ]] && printf -v nftcmd '%sdelete %s\n' "$nftcmd" "$table" |
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done < <(nft list tables 2>/dev/null) |
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[[ -z $nftcmd ]] || cmd nft -f <(echo -n "$nftcmd") |
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fi |
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if type -p iptables >/dev/null; then |
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local line iptables found restore |
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for iptables in iptables ip6tables; do |
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restore="" found=0 |
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while read -r line; do |
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[[ $line == "*"* || $line == COMMIT || $line == "-A "*"-m comment --comment \"wg-quick(8) rule for $INTERFACE\""* ]] || continue |
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[[ $line == "-A"* ]] && found=1 |
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printf -v restore '%s%s\n' "$restore" "${line/#-A/-D}" |
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done < <($iptables-save 2>/dev/null) |
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[[ $found -ne 1 ]] || echo -n "$restore" | cmd $iptables-restore -n |
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done |
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fi |
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} |
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HAVE_SET_FIREWALL=0 |
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add_default() { |
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local table line |
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if ! get_fwmark table; then |
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table=51820 |
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while [[ -n $(ip -4 route show table $table 2>/dev/null) || -n $(ip -6 route show table $table 2>/dev/null) ]]; do |
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((table++)) |
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done |
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cmd wg set "$INTERFACE" fwmark $table |
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fi |
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local proto=-4 iptables=iptables pf=ip |
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[[ $1 == *:* ]] && proto=-6 iptables=ip6tables pf=ip6 |
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cmd ip $proto route add "$1" dev "$INTERFACE" table $table |
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cmd ip $proto rule add not fwmark $table table $table |
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cmd ip $proto rule add table main suppress_prefixlength 0 |
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local marker="-m comment --comment \"wg-quick(8) rule for $INTERFACE\"" restore=$'*raw\n' nftable="wg-quick-$INTERFACE" nftcmd |
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printf -v nftcmd '%sadd table %s %s\n' "$nftcmd" "$pf" "$nftable" |
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printf -v nftcmd '%sadd chain %s %s preraw { type filter hook prerouting priority -300; }\n' "$nftcmd" "$pf" "$nftable" |
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printf -v nftcmd '%sadd chain %s %s premangle { type filter hook prerouting priority -150; }\n' "$nftcmd" "$pf" "$nftable" |
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printf -v nftcmd '%sadd chain %s %s postmangle { type filter hook postrouting priority -150; }\n' "$nftcmd" "$pf" "$nftable" |
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while read -r line; do |
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[[ $line =~ .*inet6?\ ([0-9a-f:.]+)/[0-9]+.* ]] || continue |
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printf -v restore '%s-I PREROUTING ! -i %s -d %s -m addrtype ! --src-type LOCAL -j DROP %s\n' "$restore" "$INTERFACE" "${BASH_REMATCH[1]}" "$marker" |
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printf -v nftcmd '%sadd rule %s %s preraw iifname != "%s" %s daddr %s fib saddr type != local drop\n' "$nftcmd" "$pf" "$nftable" "$INTERFACE" "$pf" "${BASH_REMATCH[1]}" |
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done < <(ip -o $proto addr show dev "$INTERFACE" 2>/dev/null) |
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printf -v restore '%sCOMMIT\n*mangle\n-I POSTROUTING -m mark --mark %d -p udp -j CONNMARK --save-mark %s\n-I PREROUTING -p udp -j CONNMARK --restore-mark %s\nCOMMIT\n' "$restore" $table "$marker" "$marker" |
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printf -v nftcmd '%sadd rule %s %s postmangle meta l4proto udp mark %d ct mark set mark \n' "$nftcmd" "$pf" "$nftable" $table |
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printf -v nftcmd '%sadd rule %s %s premangle meta l4proto udp meta mark set ct mark \n' "$nftcmd" "$pf" "$nftable" |
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[[ $proto == -4 ]] && cmd sysctl -q net.ipv4.conf.all.src_valid_mark=1 |
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if type -p nft >/dev/null; then |
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cmd nft -f <(echo -n "$nftcmd") |
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else |
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echo -n "$restore" | cmd $iptables-restore -n |
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fi |
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HAVE_SET_FIREWALL=1 |
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return 0 |
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} |
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set_config() { |
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cmd wg setconf "$INTERFACE" <(echo "$WG_CONFIG") |
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} |
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save_config() { |
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local old_umask new_config current_config address cmd |
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[[ $(ip -all -brief address show dev "$INTERFACE") =~ ^$INTERFACE\ +\ [A-Z]+\ +(.+)$ ]] || true |
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new_config=$'[Interface]\n' |
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for address in ${BASH_REMATCH[1]}; do |
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new_config+="Address = $address"$'\n' |
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done |
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while read -r address; do |
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[[ $address =~ ^nameserver\ ([a-zA-Z0-9_=+:%.-]+)$ ]] && new_config+="DNS = ${BASH_REMATCH[1]}"$'\n' |
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done < <(resolvconf -l "$(resolvconf_iface_prefix)$INTERFACE" 2>/dev/null || cat "/etc/resolvconf/run/interface/$(resolvconf_iface_prefix)$INTERFACE" 2>/dev/null) |
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[[ -n $MTU && $(ip link show dev "$INTERFACE") =~ mtu\ ([0-9]+) ]] && new_config+="MTU = ${BASH_REMATCH[1]}"$'\n' |
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[[ -n $TABLE ]] && new_config+="Table = $TABLE"$'\n' |
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[[ $SAVE_CONFIG -eq 0 ]] || new_config+=$'SaveConfig = true\n' |
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for cmd in "${PRE_UP[@]}"; do |
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new_config+="PreUp = $cmd"$'\n' |
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done |
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for cmd in "${POST_UP[@]}"; do |
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new_config+="PostUp = $cmd"$'\n' |
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done |
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for cmd in "${PRE_DOWN[@]}"; do |
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new_config+="PreDown = $cmd"$'\n' |
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done |
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for cmd in "${POST_DOWN[@]}"; do |
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new_config+="PostDown = $cmd"$'\n' |
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done |
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old_umask="$(umask)" |
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umask 077 |
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current_config="$(cmd wg showconf "$INTERFACE")" |
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trap 'rm -f "$CONFIG_FILE.tmp"; exit' INT TERM EXIT |
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echo "${current_config/\[Interface\]$'\n'/$new_config}" > "$CONFIG_FILE.tmp" || die "Could not write configuration file" |
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sync "$CONFIG_FILE.tmp" |
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mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || die "Could not move configuration file" |
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trap - INT TERM EXIT |
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umask "$old_umask" |
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} |
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execute_hooks() { |
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local hook |
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for hook in "$@"; do |
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hook="${hook//%i/$INTERFACE}" |
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echo "[#] $hook" >&2 |
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(eval "$hook") |
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done |
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} |
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cmd_usage() { |
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cat >&2 <<-_EOF |
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Usage: $PROGRAM [ up | down | save | strip ] [ CONFIG_FILE | INTERFACE ] |
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CONFIG_FILE is a configuration file, whose filename is the interface name |
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followed by \`.conf'. Otherwise, INTERFACE is an interface name, with |
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configuration found at /etc/wireguard/INTERFACE.conf. It is to be readable |
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by wg(8)'s \`setconf' sub-command, with the exception of the following additions |
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to the [Interface] section, which are handled by $PROGRAM: |
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- Address: may be specified one or more times and contains one or more |
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IP addresses (with an optional CIDR mask) to be set for the interface. |
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- DNS: an optional DNS server to use while the device is up. |
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- MTU: an optional MTU for the interface; if unspecified, auto-calculated. |
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- Table: an optional routing table to which routes will be added; if |
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unspecified or \`auto', the default table is used. If \`off', no routes |
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are added. |
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- PreUp, PostUp, PreDown, PostDown: script snippets which will be executed |
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by bash(1) at the corresponding phases of the link, most commonly used |
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to configure DNS. The string \`%i' is expanded to INTERFACE. |
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- SaveConfig: if set to \`true', the configuration is saved from the current |
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state of the interface upon shutdown. |
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See wg-quick(8) for more info and examples. |
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_EOF |
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} |
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cmd_up() { |
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local i |
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[[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists" |
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trap 'del_if; exit' INT TERM EXIT |
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execute_hooks "${PRE_UP[@]}" |
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add_if |
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set_config |
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for i in "${ADDRESSES[@]}"; do |
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add_addr "$i" |
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done |
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set_mtu_up |
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set_dns |
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for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do |
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add_route "$i" |
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done |
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execute_hooks "${POST_UP[@]}" |
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trap - INT TERM EXIT |
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} |
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cmd_down() { |
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[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface" |
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execute_hooks "${PRE_DOWN[@]}" |
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[[ $SAVE_CONFIG -eq 0 ]] || save_config |
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del_if |
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unset_dns || true |
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remove_firewall || true |
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execute_hooks "${POST_DOWN[@]}" |
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} |
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|
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cmd_save() { |
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[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface" |
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save_config |
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} |
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|
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cmd_strip() { |
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echo "$WG_CONFIG" |
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} |
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|
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# ~~ function override insertion point ~~ |
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|
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if [[ $# -eq 1 && ( $1 == --help || $1 == -h || $1 == help ) ]]; then |
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cmd_usage |
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elif [[ $# -eq 2 && $1 == up ]]; then |
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auto_su |
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parse_options "$2" |
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cmd_up |
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elif [[ $# -eq 2 && $1 == down ]]; then |
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auto_su |
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parse_options "$2" |
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cmd_down |
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elif [[ $# -eq 2 && $1 == save ]]; then |
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auto_su |
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parse_options "$2" |
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cmd_save |
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elif [[ $# -eq 2 && $1 == strip ]]; then |
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auto_su |
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parse_options "$2" |
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cmd_strip |
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else |
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cmd_usage |
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exit 1 |
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fi |
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|
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exit 0 |
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root@instance-2:~# |
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