+static int process_policy(sd_bus *from, sd_bus *to, sd_bus_message *m, Policy *policy, const struct ucred *our_ucred, Set *owned_names) {
+ int r;
+
+ assert(from);
+ assert(to);
+ assert(m);
+
+ if (!policy)
+ return 0;
+
+ if (from->is_kernel) {
+ uid_t sender_uid = (uid_t) -1;
+ gid_t sender_gid = (gid_t) -1;
+ char **sender_names = NULL;
+ bool granted = false;
+
+ /* Driver messages are always OK */
+ if (streq_ptr(m->sender, "org.freedesktop.DBus"))
+ return 0;
+
+ /* The message came from the kernel, and is sent to our legacy client. */
+ r = sd_bus_creds_get_well_known_names(&m->creds, &sender_names);
+ if (r < 0)
+ return r;
+
+ (void) sd_bus_creds_get_uid(&m->creds, &sender_uid);
+ (void) sd_bus_creds_get_gid(&m->creds, &sender_gid);
+
+ /* First check whether the sender can send the message to our name */
+ if (set_isempty(owned_names)) {
+ if (policy_check_send(policy, sender_uid, sender_gid, m->header->type, NULL, m->path, m->interface, m->member))
+ granted = true;
+ } else {
+ Iterator i;
+ char *n;
+
+ SET_FOREACH(n, owned_names, i)
+ if (policy_check_send(policy, sender_uid, sender_gid, m->header->type, n, m->path, m->interface, m->member)) {
+ granted = true;
+ break;
+ }
+ }
+
+ if (granted) {
+ /* Then check whether us, the recipient can recieve from the sender's name */
+ if (strv_isempty(sender_names)) {
+ if (policy_check_recv(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, m->path, m->interface, m->member))
+ return 0;
+ } else {
+ char **n;
+
+ STRV_FOREACH(n, sender_names) {
+ if (policy_check_recv(policy, our_ucred->uid, our_ucred->gid, m->header->type, *n, m->path, m->interface, m->member))
+ return 0;
+ }
+ }
+ }
+
+ /* Return an error back to the caller */
+ if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+ return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML receiver policy.");
+
+ /* Return 1, indicating that the message shall not be processed any further */
+ return 1;
+ }
+
+ if (to->is_kernel) {
+ _cleanup_bus_creds_unref_ sd_bus_creds *destination_creds = NULL;
+ uid_t destination_uid = (uid_t) -1;
+ gid_t destination_gid = (gid_t) -1;
+ const char *destination_unique = NULL;
+ char **destination_names = NULL;
+ bool granted = false;
+
+ /* Driver messages are always OK */
+ if (streq_ptr(m->destination, "org.freedesktop.DBus"))
+ return 0;
+
+ /* The message came from the legacy client, and is sent to kdbus. */
+ if (m->destination) {
+ r = sd_bus_get_name_creds(to, m->destination,
+ SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME|
+ SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID, &destination_creds);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_creds_get_well_known_names(destination_creds, &destination_names);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_creds_get_unique_name(destination_creds, &destination_unique);
+ if (r < 0)
+ return r;
+
+ (void) sd_bus_creds_get_uid(destination_creds, &destination_uid);
+ (void) sd_bus_creds_get_gid(destination_creds, &destination_gid);
+ }
+
+ /* First check if we, the sender can send to this name */
+ if (strv_isempty(destination_names)) {
+ if (policy_check_send(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, m->path, m->interface, m->member))
+ granted = true;
+ } else {
+ char **n;
+
+ STRV_FOREACH(n, destination_names) {
+ if (policy_check_send(policy, our_ucred->uid, our_ucred->gid, m->header->type, *n, m->path, m->interface, m->member)) {
+
+ /* If we made a receiver decision,
+ then remember which name's policy
+ we used, and to which unique ID it
+ mapped when we made the
+ decision. Then, let's pass this to
+ the kernel when sending the
+ message, so that it refuses the
+ operation should the name and
+ unique ID not map to each other
+ anymore. */
+
+ r = free_and_strdup(&m->destination_ptr, *n);
+ if (r < 0)
+ return r;
+
+ r = bus_kernel_parse_unique_name(destination_unique, &m->verify_destination_id);
+ if (r < 0)
+ break;
+
+ granted = true;
+ break;
+ }
+ }
+ }
+
+ /* Then check if the recipient can receive from our name */
+ if (granted) {
+ if (set_isempty(owned_names)) {
+ if (policy_check_recv(policy, destination_uid, destination_gid, m->header->type, NULL, m->path, m->interface, m->member))
+ return 0;
+ } else {
+ Iterator i;
+ char *n;
+
+ SET_FOREACH(n, owned_names, i)
+ if (policy_check_recv(policy, destination_uid, destination_gid, m->header->type, n, m->path, m->interface, m->member))
+ return 0;
+ }
+ }
+
+ /* Return an error back to the caller */
+ if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+ return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML sender policy.");
+
+ /* Return 1, indicating that the message shall not be processed any further */
+ return 1;
+ }
+
+ return 0;
+}
+
+static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
~ianmdlvl / elogind.git / commitdiff