Merge remote-tracking branch 'origin/maint-0.2.4' into maint-0.2.5

changes/bug15600

@@ -0,0 +1,5 @@
+  o Major bugfixes (security, hidden service):
+    - Fix an issue that would allow a malicious client to trigger
+      an assertion failure and halt a hidden service. Fixes
+      bug 15600; bugfix on 0.2.1.6-alpha. Reported by "skruffy".
+

changes/bug15601

@@ -0,0 +1,4 @@
+  o Major bugfixes (security, hidden service):
+    - Fix a bug that could cause a client to crash with an assertion
+      failure when parsing a malformed hidden service descriptor.
+      Fixes bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnCha".

src/or/rendcommon.c

@@ -1087,7 +1087,7 @@ rend_cache_store_v2_desc_as_client(const char *desc,
     goto err;
   }
   /* Decode/decrypt introduction points. */
-  if (intro_content) {
+  if (intro_content && intro_size > 0) {
     int n_intro_points;
     if (rend_query->auth_type != REND_NO_AUTH &&
         !tor_mem_is_zero(rend_query->descriptor_cookie,

src/or/rendservice.c

@@ -1819,6 +1819,16 @@ rend_service_parse_intro_for_v2(
 
     goto err;
   }
+  if (128 != crypto_pk_keysize(extend_info->onion_key)) {
+    if (err_msg_out) {
+      tor_asprintf(err_msg_out,
+                   "invalid onion key size in version %d INTRODUCE%d cell",
+                   intro->version,
+                   (intro->type));
+    }
+
+    goto err;
+  }
 
   ver_specific_len = 7+DIGEST_LEN+2+klen;
 

src/or/routerparse.c

@@ -4684,7 +4684,7 @@ rend_parse_introduction_points(rend_service_descriptor_t *parsed,
                                size_t intro_points_encoded_size)
 {
   const char *current_ipo, *end_of_intro_points;
-  smartlist_t *tokens;
+  smartlist_t *tokens = NULL;
   directory_token_t *tok;
   rend_intro_point_t *intro;
   extend_info_t *info;
@@ -4693,8 +4693,10 @@ rend_parse_introduction_points(rend_service_descriptor_t *parsed,
   tor_assert(parsed);
   /** Function may only be invoked once. */
   tor_assert(!parsed->intro_nodes);
-  tor_assert(intro_points_encoded);
-  tor_assert(intro_points_encoded_size > 0);
+  if (!intro_points_encoded || intro_points_encoded_size == 0) {
+    log_warn(LD_REND, "Empty or zero size introduction point list");
+    goto err;
+  }
   /* Consider one intro point after the other. */
   current_ipo = intro_points_encoded;
   end_of_intro_points = intro_points_encoded + intro_points_encoded_size;
@@ -4798,8 +4800,10 @@ rend_parse_introduction_points(rend_service_descriptor_t *parsed,
 
  done:
   /* Free tokens and clear token list. */
-  SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
-  smartlist_free(tokens);
+  if (tokens) {
+    SMARTLIST_FOREACH(tokens, directory_token_t *, t, token_clear(t));
+    smartlist_free(tokens);
+  }
   if (area)
     memarea_drop_all(area);