--- src/wg-quick/linux.bash | 113 ++++++++++++++++++++-------------------- 1 file changed, 56 insertions(+), 57 deletions(-)
diff --git a/src/wg-quick/linux.bash b/src/wg-quick/linux.bash index 7c2c002..7bd2f85 100755 --- a/src/wg-quick/linux.bash +++ b/src/wg-quick/linux.bash @@ -22,10 +22,15 @@ POST_UP=( ) PRE_DOWN=( ) POST_DOWN=( ) SAVE_CONFIG=0 +ALLOWEDIPS=( ) CONFIG_FILE="" PROGRAM="${0##*/}" ARGS=( "$@" ) +# needs to match across all wireguard devices, because only one +# suppress_ifgroup is supported +IFGROUP=51820 + cmd() { echo "[#] $*" >&2 "$@" @@ -65,6 +70,7 @@ parse_options() { SaveConfig) read_bool SAVE_CONFIG "$value"; continue ;; esac fi + [[ $key == "AllowedIPs" ]] && ALLOWEDIPS+=( ${value//,/ } ) WG_CONFIG+="$line"$'\n' done < "$CONFIG_FILE" shopt -u nocasematch @@ -93,21 +99,23 @@ add_if() { } del_if() { - local table + local table table_local table_drop [[ $HAVE_SET_DNS -eq 0 ]] || unset_dns - [[ $HAVE_SET_FIREWALL -eq 0 ]] || remove_firewall if [[ -z $TABLE || $TABLE == auto ]] && get_fwmark table && [[ $(wg show "$INTERFACE" allowed-ips) =~ /0(\ |$'\n'|$) ]]; then - while [[ $(ip -4 rule show 2>/dev/null) == *"lookup $table"* ]]; do - cmd ip -4 rule delete table $table - done - while [[ $(ip -4 rule show 2>/dev/null) == *"from all lookup main suppress_prefixlength 0"* ]]; do - cmd ip -4 rule delete table main suppress_prefixlength 0 - done - while [[ $(ip -6 rule show 2>/dev/null) == *"lookup $table"* ]]; do - cmd ip -6 rule delete table $table - done - while [[ $(ip -6 rule show 2>/dev/null) == *"from all lookup main suppress_prefixlength 0"* ]]; do - cmd ip -6 rule delete table main suppress_prefixlength 0 + table_local=$((table + 1)) + table_drop=$((table + 2)) + for proto in -4 -6; do + for _table in $table $table_local $table_drop; do + while [[ $(ip $proto rule show 2>/dev/null) == *"lookup $_table"* ]]; do + cmd ip $proto rule delete lookup $_table + done + if [[ -n $(ip $proto route show table $_table 2>/dev/null) ]]; then + cmd ip $proto route flush table $_table + fi + done + while [[ $(ip $proto rule show 2>/dev/null) == *"from all lookup main suppress_prefixlength 0"* ]]; do + cmd ip $proto rule delete lookup main suppress_prefixlength 0 + done done fi cmd ip link delete dev "$INTERFACE" @@ -181,31 +189,8 @@ get_fwmark() { return 0 } -remove_firewall() { - if type -p nft >/dev/null; then - local table nftcmd - while read -r table; do - [[ $table == *" wg-quick-$INTERFACE" ]] && printf -v nftcmd '%sdelete %s\n' "$nftcmd" "$table" - done < <(nft list tables 2>/dev/null) - [[ -z $nftcmd ]] || cmd nft -f <(echo -n "$nftcmd") - fi - if type -p iptables >/dev/null; then - local line iptables found restore - for iptables in iptables ip6tables; do - restore="" found=0 - while read -r line; do - [[ $line == "*"* || $line == COMMIT || $line == "-A "*"-m comment --comment \"wg-quick(8) rule for $INTERFACE\""* ]] || continue - [[ $line == "-A"* ]] && found=1 - printf -v restore '%s%s\n' "$restore" "${line/#-A/-D}" - done < <($iptables-save 2>/dev/null) - [[ $found -ne 1 ]] || echo -n "$restore" | cmd $iptables-restore -n - done - fi -} - -HAVE_SET_FIREWALL=0 add_default() { - local table line + local table line table_local if ! get_fwmark table; then table=51820 while [[ -n $(ip -4 route show table $table 2>/dev/null) || -n $(ip -6 route show table $table 2>/dev/null) ]]; do @@ -213,32 +198,35 @@ add_default() { done cmd wg set "$INTERFACE" fwmark $table fi + table_local=$((table+1)) + table_drop=$((table+2)) local proto=-4 iptables=iptables pf=ip [[ $1 == *:* ]] && proto=-6 iptables=ip6tables pf=ip6 cmd ip $proto route add "$1" dev "$INTERFACE" table $table cmd ip $proto rule add not fwmark $table table $table cmd ip $proto rule add table main suppress_prefixlength 0 - local marker="-m comment --comment \"wg-quick(8) rule for $INTERFACE\"" restore=$'*raw\n' nftable="wg-quick-$INTERFACE" nftcmd - printf -v nftcmd '%sadd table %s %s\n' "$nftcmd" "$pf" "$nftable" - printf -v nftcmd '%sadd chain %s %s preraw { type filter hook prerouting priority -300; }\n' "$nftcmd" "$pf" "$nftable" - printf -v nftcmd '%sadd chain %s %s premangle { type filter hook prerouting priority -150; }\n' "$nftcmd" "$pf" "$nftable" - printf -v nftcmd '%sadd chain %s %s postmangle { type filter hook postrouting priority -150; }\n' "$nftcmd" "$pf" "$nftable" - while read -r line; do - [[ $line =~ .*inet6?\ ([0-9a-f:.]+)/[0-9]+.* ]] || continue - printf -v restore '%s-I PREROUTING ! -i %s -d %s -m addrtype ! --src-type LOCAL -j DROP %s\n' "$restore" "$INTERFACE" "${BASH_REMATCH[1]}" "$marker" - printf -v nftcmd '%sadd rule %s %s preraw iifname != "%s" %s daddr %s fib saddr type != local drop\n' "$nftcmd" "$pf" "$nftable" "$INTERFACE" "$pf" "${BASH_REMATCH[1]}" - done < <(ip -o $proto addr show dev "$INTERFACE" 2>/dev/null) - 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" "$marker" - printf -v nftcmd '%sadd rule %s %s postmangle meta l4proto udp mark %d ct mark set mark \n' "$nftcmd" "$pf" "$nftable" $table - printf -v nftcmd '%sadd rule %s %s premangle meta l4proto udp meta mark set ct mark \n' "$nftcmd" "$pf" "$nftable" - [[ $proto == -4 ]] && cmd sysctl -q net.ipv4.conf.all.src_valid_mark=1 - if type -p nft >/dev/null; then - cmd nft -f <(echo -n "$nftcmd") - else - echo -n "$restore" | cmd $iptables-restore -n + ip link set $INTERFACE group $IFGROUP + # this can be done with ip -batch, but this way allows us to use the cmd wrapper + ip $proto route show table local dev $INTERFACE | while read route; do + cmd ip $proto route add $route dev $INTERFACE table $table_local + if [[ "$route" == "local "* ]]; then + cmd ip $proto route add blackhole ${route#local} table $table_drop + fi + done + # ip rules are added in reverse priority order, so drop MUST be first + cmd ip $proto rule add lookup $table_drop + cmd ip $proto rule add iif $INTERFACE lookup $table_local + cmd ip $proto rule add iif lo lookup $table_local + # pre-state checked in cmd_up + if grep -q '^1$' /proc/sys/net/ipv4/conf/*/rp_filter; then + cmd sysctl -q net.ipv4.conf.all.rp_filter=2 fi - HAVE_SET_FIREWALL=1 + if [[ $(ip rule show priority 0) == $'0:\tfrom all lookup local' ]]; then + cmd ip $proto rule add lookup local suppress_ifgroup $IFGROUP priority 0 + cmd ip $proto rule del lookup local priority 0 + fi + return 0 } @@ -321,6 +309,18 @@ cmd_usage() { cmd_up() { local i [[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists" + if [[ "${ROUTES[*]} " == *"/0 "* ]]; then + # do some checks first so we don't have to die in add_default later + case "$(ip rule show priority 0)" in + $'0:\tfrom all lookup local') ;; + $'0:\tfrom all lookup local suppress_ifgroup '$IFGROUP) ;; + *) die "ip rule priority 0 must be default or suppress_ifgroup $IFGROUP" ;; + esac + # most mainstream distros (all systemd-based) set rp_filter=2 by default anyways + if grep -q '^1$' /proc/sys/net/ipv4/conf/*/rp_filter; then + echo "$PROGRAM: warning: setting net.ipv4.conf.all.rp_filter=2 to support /0 route" + fi + fi trap 'del_if; exit' INT TERM EXIT execute_hooks "${PRE_UP[@]}" add_if @@ -343,7 +343,6 @@ cmd_down() { [[ $SAVE_CONFIG -eq 0 ]] || save_config del_if unset_dns || true - remove_firewall || true execute_hooks "${POST_DOWN[@]}" } -- 2.25.1 _______________________________________________ WireGuard mailing list WireGuard@lists.zx2c4.com https://lists.zx2c4.com/mailman/listinfo/wireguard