wg-quick: android: refactor and add incoming allow rules
Suggested-by: Yağmur Oymak <yagmur.oymak@gmail.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
b30e74b595
commit
6a5906608c
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@ -263,30 +263,84 @@ static void add_if(const char *iface)
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static void del_if(const char *iface)
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{
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DEFINE_CMD(c);
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_cleanup_regfree_ regex_t reg = { 0 };
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DEFINE_CMD(c_rule);
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DEFINE_CMD(c_iptables);
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DEFINE_CMD(c_ip6tables);
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_cleanup_regfree_ regex_t rule_reg = { 0 }, iptables_reg = { 0 };
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regmatch_t matches[2];
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char *netid = NULL;
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_cleanup_free_ char *regex = concat("0xc([0-9a-f]+)/0xcffff lookup ", iface, NULL);
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_cleanup_free_ char *rule_regex = concat("0xc([0-9a-f]+)/0xcffff lookup ", iface, NULL);
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_cleanup_free_ char *iptables_regex = concat("^-A (.* --comment \"wireguard rule ", iface, "\"[^\n]*)\n*$", NULL);
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xregcomp(®, regex, REG_EXTENDED);
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xregcomp(&rule_reg, rule_regex, REG_EXTENDED);
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xregcomp(&iptables_reg, iptables_regex, REG_EXTENDED);
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cmd("iptables -D OUTPUT -m mark --mark 0x20000 -j ACCEPT -m comment --comment \"wireguard rule %s\"", iface);
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cmd("ip6tables -D OUTPUT -m mark --mark 0x20000 -j ACCEPT -m comment --comment \"wireguard rule %s\"", iface);
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cmd("ip link del %s", iface);
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for (char *ret = cmd_ret(&c, "ip rule show"); ret; ret = cmd_ret(&c, NULL)) {
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if (!regexec(®, ret, ARRAY_SIZE(matches), matches, 0)) {
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ret[matches[1].rm_eo] = '\0';
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netid = &ret[matches[1].rm_so];
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for (char *rule = cmd_ret(&c_iptables, "iptables-save"); rule; rule = cmd_ret(&c_iptables, NULL)) {
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if (!regexec(&iptables_reg, rule, ARRAY_SIZE(matches), matches, 0)) {
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rule[matches[1].rm_eo] = '\0';
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cmd("iptables -D %s", &rule[matches[1].rm_so]);
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}
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}
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for (char *rule = cmd_ret(&c_ip6tables, "ip6tables-save"); rule; rule = cmd_ret(&c_ip6tables, NULL)) {
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if (!regexec(&iptables_reg, rule, ARRAY_SIZE(matches), matches, 0)) {
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rule[matches[1].rm_eo] = '\0';
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cmd("ip6tables -D %s", &rule[matches[1].rm_so]);
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}
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}
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for (char *rule = cmd_ret(&c_rule, "ip rule show"); rule; rule = cmd_ret(&c_rule, NULL)) {
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if (!regexec(&rule_reg, rule, ARRAY_SIZE(matches), matches, 0)) {
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rule[matches[1].rm_eo] = '\0';
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netid = &rule[matches[1].rm_so];
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break;
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}
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}
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if (netid)
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cndc("network destroy %lu", strtoul(netid, NULL, 16));
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}
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static void up_if(unsigned int *netid, const char *iface)
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static bool should_block_ipv6(const char *iface)
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{
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DEFINE_CMD(c);
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bool has_ipv6 = false, has_all_none = true;
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for (char *endpoint = cmd_ret(&c, "wg show %s endpoints", iface); endpoint; endpoint = cmd_ret(&c, NULL)) {
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char *start = strchr(endpoint, '\t');
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if (!start)
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continue;
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++start;
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if (start[0] != '(')
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has_all_none = false;
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if (start[0] == '[')
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has_ipv6 = true;
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}
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return !has_ipv6 && !has_all_none;
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}
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static uint16_t determine_listen_port(const char *iface)
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{
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DEFINE_CMD(c);
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unsigned long listen_port = 0;
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char *value;
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cmd("ip link set up dev %s", iface);
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value = cmd_ret(&c, "wg show %s listen-port", iface);
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if (!value)
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goto set_back_down;
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listen_port = strtoul(value, NULL, 10);
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if (listen_port > UINT16_MAX || !listen_port) {
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listen_port = 0;
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goto set_back_down;
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}
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set_back_down:
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cmd("ip link set down dev %s", iface);
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return listen_port;
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}
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static void up_if(unsigned int *netid, const char *iface, uint16_t listen_port)
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{
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srandom(time(NULL) ^ getpid()); /* Not real randomness. */
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@ -296,6 +350,10 @@ static void up_if(unsigned int *netid, const char *iface)
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cmd("wg set %s fwmark 0x20000", iface);
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cmd("iptables -I OUTPUT 1 -m mark --mark 0x20000 -j ACCEPT -m comment --comment \"wireguard rule %s\"", iface);
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cmd("ip6tables -I OUTPUT 1 -m mark --mark 0x20000 -j ACCEPT -m comment --comment \"wireguard rule %s\"", iface);
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if (listen_port) {
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cmd("iptables -I INPUT 1 -p udp --dport %u -j ACCEPT -m comment --comment \"wireguard rule %s\"", listen_port, iface);
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cmd("ip6tables -I INPUT 1 -p udp --dport %u -j %s -m comment --comment \"wireguard rule %s\"", listen_port, should_block_ipv6(iface) ? "DROP" : "ACCEPT", iface);
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}
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cndc("interface setcfg %s up", iface);
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cndc("network create %u vpn 1 1", *netid);
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cndc("network interface add %u %s", *netid, iface);
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@ -520,56 +578,6 @@ static void set_routes(const char *iface, unsigned int netid)
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}
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}
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static void maybe_block_ipv6(const char *iface)
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{
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DEFINE_CMD(c_endpoints);
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DEFINE_CMD(c_listenport);
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bool has_ipv6 = false, has_all_none = true;
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char *value;
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unsigned long listenport;
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for (char *endpoint = cmd_ret(&c_endpoints, "wg show %s endpoints", iface); endpoint; endpoint = cmd_ret(&c_endpoints, NULL)) {
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char *start = strchr(endpoint, '\t');
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if (!start)
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continue;
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++start;
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if (start[0] != '(')
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has_all_none = false;
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if (start[0] == '[')
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has_ipv6 = true;
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}
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if (has_ipv6 || has_all_none)
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return;
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cmd("ip link set up dev %s", iface);
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value = cmd_ret(&c_listenport, "wg show %s listen-port", iface);
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if (!value)
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goto set_back_down;
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listenport = strtoul(value, NULL, 10);
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if (listenport > UINT16_MAX || !listenport)
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goto set_back_down;
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cmd("ip6tables -I INPUT 1 -p udp --dport %lu -j DROP -m comment --comment \"wireguard rule %s\"", listenport, iface);
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set_back_down:
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cmd("ip link set down dev %s", iface);
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}
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static void maybe_unblock_ipv6(const char *iface)
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{
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regmatch_t matches[2];
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_cleanup_regfree_ regex_t reg = { 0 };
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_cleanup_free_ char *regex = concat("^-A (.* --comment \"wireguard rule ", iface, "\"[^\n]*)\n*$", NULL);
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DEFINE_CMD(c);
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xregcomp(®, regex, REG_EXTENDED);
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for (char *rule = cmd_ret(&c, "ip6tables-save"); rule; rule = cmd_ret(&c, NULL)) {
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if (!regexec(®, rule, ARRAY_SIZE(matches), matches, 0)) {
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rule[matches[1].rm_eo] = '\0';
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cmd("ip6tables -D %s", &rule[matches[1].rm_so]);
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}
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}
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}
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static void set_config(const char *iface, const char *config)
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{
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FILE *config_writer;
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@ -641,6 +649,7 @@ static void cmd_up(const char *iface, const char *config, unsigned int mtu, cons
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{
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DEFINE_CMD(c);
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unsigned int netid = 0;
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uint16_t listen_port;
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if (cmd_ret(&c, "ip link show dev %s 2>/dev/null", iface)) {
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fprintf(stderr, "Error: %s already exists\n", iface);
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@ -652,9 +661,9 @@ static void cmd_up(const char *iface, const char *config, unsigned int mtu, cons
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add_if(iface);
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set_config(iface, config);
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maybe_block_ipv6(iface);
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listen_port = determine_listen_port(iface);
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set_addr(iface, addrs);
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up_if(&netid, iface);
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up_if(&netid, iface, listen_port);
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set_dnses(netid, dnses);
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set_routes(iface, netid);
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set_mtu(iface, mtu);
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@ -686,7 +695,6 @@ static void cmd_down(const char *iface)
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}
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del_if(iface);
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maybe_unblock_ipv6(iface);
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broadcast_change();
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exit(EXIT_SUCCESS);
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}
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