wg-quick: android: support application whitelist
Prior we only supported a blacklist, but actually a whitelist is an easier algorithm because that's internally how netd considers it, so we don't need to find range spans. This commit adds an IncludedApplications key. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
20e28d2b0f
commit
e189f9942d
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@ -782,31 +782,49 @@ static uid_t *get_uid_list(const char *selected_applications)
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return uid_list;
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}
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static void set_users(unsigned int netid, const char *excluded_applications)
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static void set_users(unsigned int netid, const char *excluded_applications, const char *included_applications)
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{
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_cleanup_free_ uid_t *excluded_uids = get_uid_list(excluded_applications);
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_cleanup_free_ uid_t *uids = NULL;
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unsigned int args_per_command = 0;
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_cleanup_free_ char *ranges = NULL;
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char range[22];
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uid_t start;
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for (start = 0; *excluded_uids; start = *excluded_uids + 1, ++excluded_uids) {
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if (start > *excluded_uids - 1)
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continue;
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else if (start == *excluded_uids - 1)
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snprintf(range, sizeof(range), "%u", start);
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else
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snprintf(range, sizeof(range), "%u-%u", start, *excluded_uids - 1);
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ranges = concat_and_free(ranges, " ", range);
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if (++args_per_command % 18 == 0) {
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cndc("network users add %u %s", netid, ranges);
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free(ranges);
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ranges = NULL;
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}
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if (excluded_applications && included_applications) {
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fprintf(stderr, "Error: only one of ExcludedApplications and IncludedApplications may be specified, but not both\n");
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exit(EEXIST);
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}
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if (start < 99999) {
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snprintf(range, sizeof(range), "%u-99999", start);
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ranges = concat_and_free(ranges, " ", range);
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if (excluded_applications || !included_applications) {
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uids = get_uid_list(excluded_applications);
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for (start = 0; *uids; start = *uids + 1, ++uids) {
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if (start > *uids - 1)
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continue;
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else if (start == *uids - 1)
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snprintf(range, sizeof(range), "%u", start);
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else
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snprintf(range, sizeof(range), "%u-%u", start, *uids - 1);
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ranges = concat_and_free(ranges, " ", range);
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if (++args_per_command % 18 == 0) {
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cndc("network users add %u %s", netid, ranges);
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free(ranges);
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ranges = NULL;
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}
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}
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if (start < 99999) {
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snprintf(range, sizeof(range), "%u-99999", start);
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ranges = concat_and_free(ranges, " ", range);
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}
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} else {
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for (uids = get_uid_list(included_applications); *uids; ++uids) {
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snprintf(range, sizeof(range), "%u", *uids);
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ranges = concat_and_free(ranges, " ", range);
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if (++args_per_command % 18 == 0) {
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cndc("network users add %u %s", netid, ranges);
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free(ranges);
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ranges = NULL;
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}
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}
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}
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if (ranges)
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@ -1063,7 +1081,8 @@ static void cmd_usage(const char *program)
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" IP addresses (with an optional CIDR mask) to be set for the interface.\n"
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" - MTU: an optional MTU for the interface; if unspecified, auto-calculated.\n"
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" - DNS: an optional DNS server to use while the device is up.\n"
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" - ExcludedApplications: optional applications to exclude from the tunnel.\n\n"
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" - ExcludedApplications: optional blacklist of applications to exclude from the tunnel.\n\n"
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" - IncludedApplications: optional whitelist of applications to include in the tunnel.\n\n"
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" See wg-quick(8) for more info and examples.\n");
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}
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@ -1077,7 +1096,7 @@ static void cmd_up_cleanup(void)
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free(cleanup_iface);
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}
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static void cmd_up(const char *iface, const char *config, unsigned int mtu, const char *addrs, const char *dnses, const char *excluded_applications)
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static void cmd_up(const char *iface, const char *config, unsigned int mtu, const char *addrs, const char *dnses, const char *excluded_applications, const char *included_applications)
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{
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DEFINE_CMD(c);
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unsigned int netid = 0;
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@ -1099,7 +1118,7 @@ static void cmd_up(const char *iface, const char *config, unsigned int mtu, cons
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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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set_users(netid, excluded_applications);
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set_users(netid, excluded_applications, included_applications);
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broadcast_change();
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free(cleanup_iface);
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@ -1131,7 +1150,7 @@ static void cmd_down(const char *iface)
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exit(EXIT_SUCCESS);
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}
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static void parse_options(char **iface, char **config, unsigned int *mtu, char **addrs, char **dnses, char **excluded_applications, const char *arg)
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static void parse_options(char **iface, char **config, unsigned int *mtu, char **addrs, char **dnses, char **excluded_applications, char **included_applications, const char *arg)
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{
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_cleanup_fclose_ FILE *file = NULL;
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_cleanup_free_ char *line = NULL;
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@ -1215,6 +1234,9 @@ static void parse_options(char **iface, char **config, unsigned int *mtu, char *
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} else if (!strncasecmp(clean, "ExcludedApplications=", 21) && j > 4) {
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*excluded_applications = concat_and_free(*excluded_applications, ",", clean + 21);
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continue;
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} else if (!strncasecmp(clean, "IncludedApplications=", 21) && j > 4) {
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*included_applications = concat_and_free(*included_applications, ",", clean + 21);
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continue;
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} else if (!strncasecmp(clean, "MTU=", 4) && j > 4) {
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*mtu = atoi(clean + 4);
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continue;
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@ -1240,17 +1262,18 @@ int main(int argc, char *argv[])
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_cleanup_free_ char *addrs = NULL;
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_cleanup_free_ char *dnses = NULL;
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_cleanup_free_ char *excluded_applications = NULL;
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_cleanup_free_ char *included_applications = NULL;
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unsigned int mtu;
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if (argc == 2 && (!strcmp(argv[1], "help") || !strcmp(argv[1], "--help") || !strcmp(argv[1], "-h")))
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cmd_usage(argv[0]);
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else if (argc == 3 && !strcmp(argv[1], "up")) {
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auto_su(argc, argv);
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parse_options(&iface, &config, &mtu, &addrs, &dnses, &excluded_applications, argv[2]);
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cmd_up(iface, config, mtu, addrs, dnses, excluded_applications);
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parse_options(&iface, &config, &mtu, &addrs, &dnses, &excluded_applications, &included_applications, argv[2]);
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cmd_up(iface, config, mtu, addrs, dnses, excluded_applications, included_applications);
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} else if (argc == 3 && !strcmp(argv[1], "down")) {
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auto_su(argc, argv);
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parse_options(&iface, &config, &mtu, &addrs, &dnses, &excluded_applications, argv[2]);
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parse_options(&iface, &config, &mtu, &addrs, &dnses, &excluded_applications, &included_applications, argv[2]);
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cmd_down(iface);
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} else {
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cmd_usage(argv[0]);
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