Check fetched rendezvous descriptors' service IDs

1 files changed, 21 insertions, 1 deletions

diff --git a/src/or/rendcommon.c b/src/or/rendcommon.c
index c83573b20..8727a70c2 100644
--- a/src/or/rendcommon.c
+++ b/src/or/rendcommon.c
@@ -1047,9 +1047,14 @@ rend_cache_lookup_v2_desc_as_dir(const char *desc_id, const char **desc)
  *
  * The published flag tells us if we store the descriptor
  * in our role as directory (1) or if we cache it as client (0).
+ *
+ * If <b>service_id</b> is non-NULL and the descriptor is not for that
+ * service ID, reject it.  <b>service_id</b> must be specified if and
+ * only if <b>published</b> is 0 (we fetched this descriptor).
  */
 int
-rend_cache_store(const char *desc, size_t desc_len, int published)
+rend_cache_store(const char *desc, size_t desc_len, int published,
+                 const char *service_id)
 {
   rend_cache_entry_t *e;
   rend_service_descriptor_t *parsed;
@@ -1068,6 +1073,12 @@ rend_cache_store(const char *desc, size_t desc_len, int published)
     rend_service_descriptor_free(parsed);
     return -2;
   }
+  if ((service_id != NULL) && strcmp(query, service_id)) {
+    log_warn(LD_REND, "Received service descriptor for service ID %s; "
+             "expected descriptor for service ID %s.",
+             query, safe_str(service_id));
+    return -2;
+  }
   now = time(NULL);
   if (parsed->timestamp < now-REND_CACHE_MAX_AGE-REND_CACHE_MAX_SKEW) {
     log_fn(LOG_PROTOCOL_WARN, LD_REND,
@@ -1253,6 +1264,8 @@ rend_cache_store_v2_desc_as_dir(const char *desc)
  * If we have an older descriptor with the same ID, replace it.
  * If we have any v0 descriptor with the same ID, reject this one in order
  * to not get confused with having both versions for the same service.
+ * If the descriptor's service ID does not match
+ * <b>rend_query</b>-\>onion_address, reject it.
  * Return -2 if it's malformed or otherwise rejected; return -1 if we
  * already have a v0 descriptor here; return 0 if it's the same or older
  * than one we've already got; return 1 if it's novel.
@@ -1303,6 +1316,13 @@ rend_cache_store_v2_desc_as_client(const char *desc,
     retval = -2;
     goto err;
   }
+  if (strcmp(rend_query->onion_address, service_id)) {
+    log_warn(LD_REND, "Received service descriptor for service ID %s; "
+             "expected descriptor for service ID %s.",
+             service_id, safe_str(rend_query->onion_address));
+    retval = -2;
+    goto err;
+  }
   /* Decode/decrypt introduction points. */
   if (intro_content) {
     if (rend_query->auth_type != REND_NO_AUTH &&