#!/bin/bash # Copyright (C) 2015-2017 Jason A. Donenfeld . All Rights Reserved. # This script tests the below topology: # # ┌─────────────────────┐ ┌──────────────────────────────────┐ ┌─────────────────────┐ # │ $ns1 namespace │ │ $ns0 namespace │ │ $ns2 namespace │ # │ │ │ │ │ │ # │┌────────┐ │ │ ┌────────┐ │ │ ┌────────┐│ # ││ wg0 │───────────┼───┼────────────│ lo │────────────┼───┼───────────│ wg0 ││ # │├────────┴──────────┐│ │ ┌───────┴────────┴────────┐ │ │┌──────────┴────────┤│ # ││192.168.241.1/24 ││ │ │(ns1) (ns2) │ │ ││192.168.241.2/24 ││ # ││fd00::1/24 ││ │ │127.0.0.1:1 127.0.0.1:2│ │ ││fd00::2/24 ││ # │└───────────────────┘│ │ │[::]:1 [::]:2 │ │ │└───────────────────┘│ # └─────────────────────┘ │ └─────────────────────────┘ │ └─────────────────────┘ # └──────────────────────────────────┘ # # After the topology is prepared we run a series of TCP/UDP iperf3 tests between the # wireguard peers in $ns1 and $ns2. Note that $ns0 is the endpoint for the wg0 # interfaces in $ns1 and $ns2. See https://www.wireguard.com/netns/ for further # details on how this is accomplished. set -e exec 3>&1 export WG_HIDE_KEYS=never netns0="wg-test-$$-0" netns1="wg-test-$$-1" netns2="wg-test-$$-2" pretty() { echo -e "\x1b[32m\x1b[1m[+] ${1:+NS$1: }${2}\x1b[0m" >&3; } pp() { pretty "" "$*"; "$@"; } maybe_exec() { if [[ $BASHPID -eq $$ ]]; then "$@"; else exec "$@"; fi; } n0() { pretty 0 "$*"; maybe_exec ip netns exec $netns0 "$@"; } n1() { pretty 1 "$*"; maybe_exec ip netns exec $netns1 "$@"; } n2() { pretty 2 "$*"; maybe_exec ip netns exec $netns2 "$@"; } ip0() { pretty 0 "ip $*"; ip -n $netns0 "$@"; } ip1() { pretty 1 "ip $*"; ip -n $netns1 "$@"; } ip2() { pretty 2 "ip $*"; ip -n $netns2 "$@"; } sleep() { read -t "$1" -N 0 || true; } waitiperf() { pretty "${1//*-}" "wait for iperf:5201"; while [[ $(ss -N "$1" -tlp 'sport = 5201') != *iperf3* ]]; do sleep 0.1; done; } waitncatudp() { pretty "${1//*-}" "wait for udp:1111"; while [[ $(ss -N "$1" -ulp 'sport = 1111') != *ncat* ]]; do sleep 0.1; done; } waitncattcp() { pretty "${1//*-}" "wait for tcp:1111"; while [[ $(ss -N "$1" -tlp 'sport = 1111') != *ncat* ]]; do sleep 0.1; done; } waitiface() { pretty "${1//*-}" "wait for $2 to come up"; ip netns exec "$1" bash -c "while [[ \$(< \"/sys/class/net/$2/operstate\") != up ]]; do read -t .1 -N 0 || true; done;"; } cleanup() { set +e exec 2>/dev/null printf "$orig_message_cost" > /proc/sys/net/core/message_cost ip0 link del dev wg0 ip1 link del dev wg0 ip2 link del dev wg0 local to_kill="$(ip netns pids $netns0) $(ip netns pids $netns1) $(ip netns pids $netns2)" [[ -n $to_kill ]] && kill $to_kill pp ip netns del $netns1 pp ip netns del $netns2 pp ip netns del $netns0 exit } orig_message_cost="$(< /proc/sys/net/core/message_cost)" trap cleanup EXIT printf 0 > /proc/sys/net/core/message_cost ip netns del $netns0 2>/dev/null || true ip netns del $netns1 2>/dev/null || true ip netns del $netns2 2>/dev/null || true pp ip netns add $netns0 pp ip netns add $netns1 pp ip netns add $netns2 ip0 link set up dev lo ip0 link add dev wg0 type wireguard ip0 link set wg0 netns $netns1 ip0 link add dev wg0 type wireguard ip0 link set wg0 netns $netns2 key1="$(pp wg genkey)" key2="$(pp wg genkey)" pub1="$(pp wg pubkey <<<"$key1")" pub2="$(pp wg pubkey <<<"$key2")" psk="$(pp wg genpsk)" [[ -n $key1 && -n $key2 && -n $psk ]] configure_peers() { ip1 addr add 192.168.241.1/24 dev wg0 ip1 addr add fd00::1/24 dev wg0 ip2 addr add 192.168.241.2/24 dev wg0 ip2 addr add fd00::2/24 dev wg0 n1 wg set wg0 \ private-key <(echo "$key1") \ listen-port 1 \ peer "$pub2" \ preshared-key <(echo "$psk") \ allowed-ips 192.168.241.2/32,fd00::2/128 n2 wg set wg0 \ private-key <(echo "$key2") \ listen-port 2 \ peer "$pub1" \ preshared-key <(echo "$psk") \ allowed-ips 192.168.241.1/32,fd00::1/128 ip1 link set up dev wg0 ip2 link set up dev wg0 } configure_peers tests() { # Ping over IPv4 n2 ping -c 10 -f -W 1 192.168.241.1 n1 ping -c 10 -f -W 1 192.168.241.2 # Ping over IPv6 n2 ping6 -c 10 -f -W 1 fd00::1 n1 ping6 -c 10 -f -W 1 fd00::2 # TCP over IPv4 n2 iperf3 -s -1 -B 192.168.241.2 & waitiperf $netns2 n1 iperf3 -Z -n 1G -c 192.168.241.2 # TCP over IPv6 n1 iperf3 -s -1 -B fd00::1 & waitiperf $netns1 n2 iperf3 -Z -n 1G -c fd00::1 # UDP over IPv4 n1 iperf3 -s -1 -B 192.168.241.1 & waitiperf $netns1 n2 iperf3 -Z -n 1G -b 0 -u -c 192.168.241.1 # UDP over IPv6 n2 iperf3 -s -1 -B fd00::2 & waitiperf $netns2 n1 iperf3 -Z -n 1G -b 0 -u -c fd00::2 } [[ $(ip1 link show dev wg0) =~ mtu\ ([0-9]+) ]] && orig_mtu="${BASH_REMATCH[1]}" big_mtu=$(( 34816 - 1500 + $orig_mtu )) # Test using IPv4 as outer transport n1 wg set wg0 peer "$pub2" endpoint 127.0.0.1:2 n2 wg set wg0 peer "$pub1" endpoint 127.0.0.1:1 # Before calling tests, we first make sure that the stats counters are working n2 ping -c 10 -f -W 1 192.168.241.1 { read _; read _; read _; read rx_bytes _; read _; read tx_bytes _; } < <(ip2 -stats link show dev wg0) [[ $rx_bytes -ge 932 && $tx_bytes -ge 1516 && $rx_bytes -lt 2500 && $rx_bytes -lt 2500 ]] tests ip1 link set wg0 mtu $big_mtu ip2 link set wg0 mtu $big_mtu tests ip1 link set wg0 mtu $orig_mtu ip2 link set wg0 mtu $orig_mtu # Test using IPv6 as outer transport n1 wg set wg0 peer "$pub2" endpoint [::1]:2 n2 wg set wg0 peer "$pub1" endpoint [::1]:1 tests ip1 link set wg0 mtu $big_mtu ip2 link set wg0 mtu $big_mtu tests ip1 link set wg0 mtu $orig_mtu ip2 link set wg0 mtu $orig_mtu # Test using IPv4 that roaming works ip0 -4 addr del 127.0.0.1/8 dev lo ip0 -4 addr add 127.212.121.99/8 dev lo n1 wg set wg0 listen-port 9999 n1 wg set wg0 peer "$pub2" endpoint 127.0.0.1:2 n1 ping6 -W 1 -c 1 fd00::2 [[ $(n2 wg show wg0 endpoints) == "$pub1 127.212.121.99:9999" ]] # Test using IPv6 that roaming works n1 wg set wg0 listen-port 9998 n1 wg set wg0 peer "$pub2" endpoint [::1]:2 n1 ping -W 1 -c 1 192.168.241.2 [[ $(n2 wg show wg0 endpoints) == "$pub1 [::1]:9998" ]] # Test that crypto-RP filter works n1 wg set wg0 peer "$pub2" allowed-ips 192.168.241.0/24 exec 4< <(n1 ncat -l -u -p 1111) nmap_pid=$! waitncatudp $netns1 n2 ncat -u 192.168.241.1 1111 <<<"X" read -r -N 1 -t 1 out <&4 && [[ $out == "X" ]] kill $nmap_pid more_specific_key="$(pp wg genkey | pp wg pubkey)" n1 wg set wg0 peer "$more_specific_key" allowed-ips 192.168.241.2/32 n2 wg set wg0 listen-port 9997 exec 4< <(n1 ncat -l -u -p 1111) nmap_pid=$! waitncatudp $netns1 n2 ncat -u 192.168.241.1 1111 <<<"X" ! read -r -N 1 -t 1 out <&4 || false kill $nmap_pid n1 wg set wg0 peer "$more_specific_key" remove [[ $(n1 wg show wg0 endpoints) == "$pub2 [::1]:9997" ]] ip1 link del wg0 ip2 link del wg0 # Test using NAT. We now change the topology to this: # ┌────────────────────────────────────────┐ ┌────────────────────────────────────────────────┐ ┌────────────────────────────────────────┐ # │ $ns1 namespace │ │ $ns0 namespace │ │ $ns2 namespace │ # │ │ │ │ │ │ # │ ┌─────┐ ┌─────┐ │ │ ┌──────┐ ┌──────┐ │ │ ┌─────┐ ┌─────┐ │ # │ │ wg0 │─────────────│vethc│───────────┼────┼────│vethrc│ │vethrs│──────────────┼─────┼──│veths│────────────│ wg0 │ │ # │ ├─────┴──────────┐ ├─────┴──────────┐│ │ ├──────┴─────────┐ ├──────┴────────────┐ │ │ ├─────┴──────────┐ ├─────┴──────────┐ │ # │ │192.168.241.1/24│ │192.168.1.100/24││ │ │192.168.1.100/24│ │10.0.0.1/24 │ │ │ │10.0.0.100/24 │ │192.168.241.2/24│ │ # │ │fd00::1/24 │ │ ││ │ │ │ │SNAT:192.168.1.0/24│ │ │ │ │ │fd00::2/24 │ │ # │ └────────────────┘ └────────────────┘│ │ └────────────────┘ └───────────────────┘ │ │ └────────────────┘ └────────────────┘ │ # └────────────────────────────────────────┘ └────────────────────────────────────────────────┘ └────────────────────────────────────────┘ ip1 link add dev wg0 type wireguard ip2 link add dev wg0 type wireguard configure_peers ip0 link add vethrc type veth peer name vethc ip0 link add vethrs type veth peer name veths ip0 link set vethc netns $netns1 ip0 link set veths netns $netns2 ip0 link set vethrc up ip0 link set vethrs up ip0 addr add 192.168.1.1/24 dev vethrc ip0 addr add 10.0.0.1/24 dev vethrs ip1 addr add 192.168.1.100/24 dev vethc ip1 link set vethc up ip1 route add default via 192.168.1.1 ip2 addr add 10.0.0.100/24 dev veths ip2 link set veths up waitiface $netns0 vethrc waitiface $netns0 vethrs waitiface $netns1 vethc waitiface $netns2 veths n0 bash -c 'printf 1 > /proc/sys/net/ipv4/ip_forward' n0 bash -c 'printf 2 > /proc/sys/net/netfilter/nf_conntrack_udp_timeout' n0 bash -c 'printf 2 > /proc/sys/net/netfilter/nf_conntrack_udp_timeout_stream' n0 iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -d 10.0.0.0/24 -j SNAT --to 10.0.0.1 n1 wg set wg0 peer "$pub2" endpoint 10.0.0.100:2 persistent-keepalive 1 n1 ping -W 1 -c 1 192.168.241.2 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.1:1" ]] # Demonstrate n2 can still send packets to n1, since persistent-keepalive will prevent connection tracking entry from expiring (to see entries: `n0 conntrack -L`). pp sleep 3 n2 ping -W 1 -c 1 192.168.241.1 n0 iptables -t nat -F ip0 link del vethrc ip0 link del vethrs ip1 link del wg0 ip2 link del wg0 # Test that saddr routing is sticky but not too sticky, changing to this topology: # ┌────────────────────────────────────────┐ ┌────────────────────────────────────────┐ # │ $ns1 namespace │ │ $ns2 namespace │ # │ │ │ │ # │ ┌─────┐ ┌─────┐ │ │ ┌─────┐ ┌─────┐ │ # │ │ wg0 │─────────────│veth1│───────────┼────┼──│veth2│────────────│ wg0 │ │ # │ ├─────┴──────────┐ ├─────┴──────────┐│ │ ├─────┴──────────┐ ├─────┴──────────┐ │ # │ │192.168.241.1/24│ │10.0.0.1/24 ││ │ │10.0.0.2/24 │ │192.168.241.2/24│ │ # │ │fd00::1/24 │ │fd00:aa::1/96 ││ │ │fd00:aa::2/96 │ │fd00::2/24 │ │ # │ └────────────────┘ └────────────────┘│ │ └────────────────┘ └────────────────┘ │ # └────────────────────────────────────────┘ └────────────────────────────────────────┘ ip1 link add dev wg0 type wireguard ip2 link add dev wg0 type wireguard configure_peers ip1 link add veth1 type veth peer name veth2 ip1 link set veth2 netns $netns2 n1 bash -c 'printf 0 > /proc/sys/net/ipv6/conf/veth1/accept_dad' n2 bash -c 'printf 0 > /proc/sys/net/ipv6/conf/veth2/accept_dad' n1 bash -c 'printf 1 > /proc/sys/net/ipv4/conf/veth1/promote_secondaries' # First we check that we aren't overly sticky and can fall over to new IPs when old ones are removed ip1 addr add 10.0.0.1/24 dev veth1 ip1 addr add fd00:aa::1/96 dev veth1 ip2 addr add 10.0.0.2/24 dev veth2 ip2 addr add fd00:aa::2/96 dev veth2 ip1 link set veth1 up ip2 link set veth2 up waitiface $netns1 veth1 waitiface $netns2 veth2 n1 wg set wg0 peer "$pub2" endpoint 10.0.0.2:2 n1 ping -W 1 -c 1 192.168.241.2 ip1 addr add 10.0.0.10/24 dev veth1 ip1 addr del 10.0.0.1/24 dev veth1 n1 ping -W 1 -c 1 192.168.241.2 n1 wg set wg0 peer "$pub2" endpoint [fd00:aa::2]:2 n1 ping -W 1 -c 1 192.168.241.2 ip1 addr add fd00:aa::10/96 dev veth1 ip1 addr del fd00:aa::1/96 dev veth1 n1 ping -W 1 -c 1 192.168.241.2 # Now we show that we can successfully do reply to sender routing ip1 link set veth1 down ip2 link set veth2 down ip1 addr flush dev veth1 ip2 addr flush dev veth2 ip1 addr add 10.0.0.1/24 dev veth1 ip1 addr add 10.0.0.2/24 dev veth1 ip1 addr add fd00:aa::1/96 dev veth1 ip1 addr add fd00:aa::2/96 dev veth1 ip2 addr add 10.0.0.3/24 dev veth2 ip2 addr add fd00:aa::3/96 dev veth2 ip1 link set veth1 up ip2 link set veth2 up waitiface $netns1 veth1 waitiface $netns2 veth2 n2 wg set wg0 peer "$pub1" endpoint 10.0.0.1:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.1:1" ]] n2 wg set wg0 peer "$pub1" endpoint [fd00:aa::1]:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 [fd00:aa::1]:1" ]] n2 wg set wg0 peer "$pub1" endpoint 10.0.0.2:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.2:1" ]] n2 wg set wg0 peer "$pub1" endpoint [fd00:aa::2]:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 [fd00:aa::2]:1" ]] # What happens if the inbound destination address belongs to a different interface as the default route? ip1 link add dummy0 type dummy ip1 addr add 10.50.0.1/24 dev dummy0 ip1 link set dummy0 up ip2 route add 10.50.0.0/24 dev veth2 n2 wg set wg0 peer "$pub1" endpoint 10.50.0.1:1 n2 ping -W 1 -c 1 192.168.241.1 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.50.0.1:1" ]] ip1 link del dummy0 ip1 addr flush dev veth1 ip2 addr flush dev veth2 ip1 route flush dev veth1 ip2 route flush dev veth2 # Now we see what happens if another interface route takes precedence over an ongoing one ip1 link add veth3 type veth peer name veth4 ip1 link set veth4 netns $netns2 ip1 addr add 10.0.0.1/24 dev veth1 ip2 addr add 10.0.0.2/24 dev veth2 ip1 addr add 10.0.0.3/24 dev veth3 ip1 link set veth1 up ip2 link set veth2 up ip1 link set veth3 up ip2 link set veth4 up waitiface $netns1 veth1 waitiface $netns2 veth2 waitiface $netns1 veth3 waitiface $netns2 veth4 ip1 route flush dev veth1 ip1 route flush dev veth3 ip1 route add 10.0.0.0/24 dev veth1 src 10.0.0.1 metric 2 n1 wg set wg0 peer "$pub2" endpoint 10.0.0.2:2 n1 ping -W 1 -c 1 192.168.241.2 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.1:1" ]] ip1 route add 10.0.0.0/24 dev veth3 src 10.0.0.3 metric 1 n1 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/veth1/rp_filter' n2 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/veth4/rp_filter' n1 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/all/rp_filter' n2 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/all/rp_filter' n1 ping -W 1 -c 1 192.168.241.2 [[ $(n2 wg show wg0 endpoints) == "$pub1 10.0.0.3:1" ]] ip1 link del veth1 ip1 link del veth3 ip1 link del wg0 ip2 link del wg0 # We test that Netlink/IPC is working properly by doing things that usually cause split responses ip0 link add dev wg0 type wireguard config=( "[Interface]" "PrivateKey=$(wg genkey)" "[Peer]" "PublicKey=$(wg genkey)" ) for a in {1..255}; do for b in {0..255}; do config+=( "AllowedIPs=$a.$b.0.0/16" ) done done n0 wg setconf wg0 <(printf '%s\n' "${config[@]}") i=0 for ip in $(n0 wg show wg0 allowed-ips); do ((++i)) done ((i == 65281)) ip0 link del wg0 ip0 link add dev wg0 type wireguard config=( "[Interface]" "PrivateKey=$(wg genkey)" ) for a in {1..40}; do config+=( "[Peer]" "PublicKey=$(wg genkey)" ) for b in {1..52}; do config+=( "AllowedIPs=$a.$b.0.0/16" ) done done n0 wg setconf wg0 <(printf '%s\n' "${config[@]}") i=0 while read -r line; do j=0 for ip in $line; do ((++j)) done ((j == 53)) ((++i)) done < <(n0 wg show wg0 allowed-ips) ((i == 40)) ip0 link del wg0 ! n0 wg show doesnotexist || false declare -A objects n0 ncat -i 1 -l -p 1111 < /dev/kmsg & waitncattcp $netns0 while read -r line; do [[ $line =~ .*(wg[0-9]+:\ [A-Z][a-z]+\ [0-9]+)\ .*(created|destroyed).* ]] || continue objects["${BASH_REMATCH[1]}"]+="${BASH_REMATCH[2]}" done < <(n0 ncat -i 1 127.0.0.1 1111) alldeleted=1 for object in "${!objects[@]}"; do if [[ ${objects["$object"]} != *createddestroyed ]]; then echo "Error: $object: merely ${objects["$object"]}" >&3 alldeleted=0 fi done [[ $alldeleted -eq 1 ]] pretty "" "Objects that were created were also destroyed."