return sd_bus_send(b, n, NULL);
}
-static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m) {
- _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
- int r;
-
- assert(a);
- assert(b);
- assert(m);
-
- if (!a->is_kernel)
- return 0;
-
- if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "GetAll"))
- return 0;
-
- if (!streq_ptr(m->path, "/org/gnome/DisplayManager/Slave"))
- return 0;
-
- r = sd_bus_message_new_method_errorf(m, &n, SD_BUS_ERROR_ACCESS_DENIED, "gdm, you are stupid");
- if (r < 0)
- return r;
-
- r = bus_message_append_sender(n, "org.freedesktop.DBus");
- if (r < 0) {
- log_error("Failed to append sender to gdm reply: %s", strerror(-r));
- return r;
- }
-
- r = bus_seal_synthetic_message(b, n);
- if (r < 0) {
- log_error("Failed to seal gdm reply: %s", strerror(-r));
- return r;
- }
-
- r = sd_bus_send(b, n, NULL);
- if (r < 0) {
- log_error("Failed to send gdm reply: %s", strerror(-r));
- return r;
- }
-
- return 1;
-}
-
static int synthetic_driver_send(sd_bus *b, sd_bus_message *m) {
int r;
return false;
}
-static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) {
+static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred) {
+ int r;
+ char **name;
+ char **names_strv;
+ bool granted = false;
+ Iterator i;
+
+ assert(a);
+ assert(b);
+ assert(m);
+
+ if (!policy)
+ return 0;
+
+ if (b->is_kernel) {
+
+ /* The message came from the kernel, and is sent to our legacy client. */
+ r = sd_bus_creds_get_well_known_names(&m->creds, &names_strv);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(name, names_strv) {
+ if (policy_check_send(policy, ucred, m->header->type, *name, m->path, m->interface, m->member)) {
+ r = free_and_strdup(&m->destination_ptr, *name);
+ if (r < 0)
+ break;
+
+ granted = true;
+ break;
+ }
+ }
+
+ if (r < 0)
+ return r;
+
+ if (!granted)
+ return -EPERM;
+
+ granted = false;
+
+ HASHMAP_FOREACH(name, names_hash, i) {
+ if (policy_check_recv(policy, ucred, m->header->type, *name, m->path, m->interface, m->member))
+ return 0;
+ }
+
+ return -EPERM;
+ } else {
+ sd_bus_creds *bus_creds;
+
+ /* The message came from the legacy client, and is sent to kdbus. */
+ r = sd_bus_get_name_creds(a, m->destination, SD_BUS_CREDS_WELL_KNOWN_NAMES, &bus_creds);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(name, names_strv) {
+ if (policy_check_send(policy, ucred, m->header->type, *name, m->path, m->interface, m->member)) {
+ r = free_and_strdup(&m->destination_ptr, *name);
+ if (r < 0)
+ break;
+
+ r = bus_kernel_parse_unique_name(m->sender, &m->verify_destination_id);
+ if (r < 0)
+ break;
+
+ granted = true;
+ break;
+ }
+ }
+
+ if (r < 0)
+ return r;
+
+ if (!granted)
+ return -EPERM;
+
+ granted = false;
+
+ HASHMAP_FOREACH(name, names_hash, i) {
+ if (policy_check_recv(policy, ucred, m->header->type, *name, m->path, m->interface, m->member))
+ return 0;
+ }
+
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred) {
int r;
assert(a);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
+ if (policy && !policy_check_own(policy, ucred, name))
+ return synthetic_reply_method_errno(m, -EPERM, NULL);
+
if (!service_name_is_valid(name))
return synthetic_reply_method_errno(m, -EINVAL, NULL);
if ((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) != 0)
}
}
-static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
+static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred, bool *got_hello) {
_cleanup_bus_message_unref_ sd_bus_message *n = NULL;
bool is_hello;
int r;
return -EIO;
}
+ if (policy && !policy_check_hello(policy, ucred)) {
+ log_error("Policy denied HELLO");
+ return -EPERM;
+ }
+
*got_hello = true;
if (!a->is_kernel)
int main(int argc, char *argv[]) {
+ _cleanup_bus_creds_unref_ sd_bus_creds *bus_creds = NULL;
_cleanup_bus_close_unref_ sd_bus *a = NULL, *b = NULL;
sd_id128_t server_id;
int r, in_fd, out_fd;
goto finish;
}
+ r = sd_bus_get_owner_creds(a, SD_BUS_CREDS_UID, &bus_creds);
+ if (r < 0) {
+ log_error("Failed to get bus creds: %s", strerror(-r));
+ goto finish;
+ }
+
r = sd_bus_new(&b);
if (r < 0) {
log_error("Failed to allocate bus: %s", strerror(-r));
}
if (m) {
+ Policy *p = NULL;
+ uid_t uid;
+
+ assert_se(sd_bus_creds_get_uid(bus_creds, &uid) == 0);
+
+ if (uid == 0 || uid != ucred.uid)
+ p = &policy;
+
/* We officially got EOF, let's quit */
if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
r = 0;
goto finish;
}
- k = process_hello(a, b, m, &got_hello);
+ k = process_hello(a, b, m, p, &ucred, &got_hello);
if (k < 0) {
r = k;
log_error("Failed to process HELLO: %s", strerror(-r));
if (k > 0)
r = k;
else {
- k = process_policy(a, b, m);
- if (k < 0) {
- r = k;
- log_error("Failed to process policy: %s", strerror(-r));
- goto finish;
- }
-
- k = process_driver(a, b, m);
+ k = process_driver(a, b, m, p, &ucred);
if (k < 0) {
r = k;
log_error("Failed to process driver calls: %s", strerror(-r));
if (k > 0)
r = k;
else {
- k = sd_bus_send(a, m, NULL);
- if (k < 0) {
- if (k == -ECONNRESET)
- r = 0;
- else {
+ bool retry;
+
+ do {
+ retry = false;
+
+ k = process_policy(a, b, m, p, &ucred);
+ if (k < 0) {
r = k;
- log_error("Failed to send message: %s", strerror(-r));
+ log_error("Failed to process policy: %s", strerror(-r));
+ goto finish;
}
- goto finish;
- }
+ k = sd_bus_send(a, m, NULL);
+ if (k < 0) {
+ if (k == -ECONNRESET)
+ r = 0;
+ else if (k == -EREMCHG)
+ retry = true;
+ else {
+ r = k;
+ log_error("Failed to send message: %s", strerror(-r));
+ }
+
+ if (!retry)
+ goto finish;
+ }
+ } while (retry);
}
}
}
~ianmdlvl / elogind.git / blobdiff