[tor-commits] [tor/maint-0.4.3] When parsing tokens, reject early on spurious keys.

[nickm at torproject.org]

commit f160212ee855b6899063f2e9355abd59105d6a04
Author: Nick Mathewson <nickm at torproject.org>
Date:   Wed Feb 5 11:57:31 2020 -0500

    When parsing tokens, reject early on spurious keys.
---
 src/feature/dirparse/parsecommon.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/feature/dirparse/parsecommon.c b/src/feature/dirparse/parsecommon.c
index 5b753f0f2..e8269f7ec 100644
--- a/src/feature/dirparse/parsecommon.c
+++ b/src/feature/dirparse/parsecommon.c
@@ -384,10 +384,16 @@ get_next_token(memarea_t *area,
     RET_ERR("Couldn't parse object: missing footer or object much too big.");
 
   if (!strcmp(tok->object_type, "RSA PUBLIC KEY")) { /* If it's a public key */
+    if (o_syn != NEED_KEY && o_syn != NEED_KEY_1024 && o_syn != OBJ_OK) {
+      RET_ERR("Unexpected public key.");
+    }
     tok->key = crypto_pk_new();
     if (crypto_pk_read_public_key_from_string(tok->key, obstart, eol-obstart))
       RET_ERR("Couldn't parse public key.");
   } else if (!strcmp(tok->object_type, "RSA PRIVATE KEY")) { /* private key */
+    if (o_syn != NEED_SKEY_1024 && o_syn != OBJ_OK) {
+      RET_ERR("Unexpected private key.");
+    }
     tok->key = crypto_pk_new();
     if (crypto_pk_read_private_key1024_from_string(tok->key,
                                                    obstart, eol-obstart))