From: Matt Caswell <matt@openssl.org>
Date: Thu, 19 Mar 2020 18:23:58 +0000 (+0000)
Subject: Use a fetched cipher when decrypting a ticket in libssl
X-Git-Tag: openssl-3.0.0-alpha1~206
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=148bfd26a4c2d0250b77c57acf30cf5c190a1d29;p=oweals%2Fopenssl.git

Use a fetched cipher when decrypting a ticket in libssl

We need to make sure we are using the correct libctx and property query.

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/11402)
---

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 76096401be..4ab046b7b3 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1521,21 +1521,29 @@ SSL_TICKET_STATUS tls_decrypt_ticket(SSL *s, const unsigned char *etick,
         if (rv == 2)
             renew_ticket = 1;
     } else {
+        EVP_CIPHER *aes256cbc = NULL;
+
         /* Check key name matches */
         if (memcmp(etick, tctx->ext.tick_key_name,
                    TLSEXT_KEYNAME_LENGTH) != 0) {
             ret = SSL_TICKET_NO_DECRYPT;
             goto end;
         }
-        if (ssl_hmac_init(hctx, tctx->ext.secure->tick_hmac_key,
-                          sizeof(tctx->ext.secure->tick_hmac_key),
-                          "SHA256") <= 0
-            || EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL,
+
+        aes256cbc = EVP_CIPHER_fetch(s->ctx->libctx, "AES-256-CBC",
+                                     s->ctx->propq);
+        if (aes256cbc == NULL
+            || ssl_hmac_init(hctx, tctx->ext.secure->tick_hmac_key,
+                             sizeof(tctx->ext.secure->tick_hmac_key),
+                             "SHA256") <= 0
+            || EVP_DecryptInit_ex(ctx, aes256cbc, NULL,
                                   tctx->ext.secure->tick_aes_key,
                                   etick + TLSEXT_KEYNAME_LENGTH) <= 0) {
+            EVP_CIPHER_free(aes256cbc);
             ret = SSL_TICKET_FATAL_ERR_OTHER;
             goto end;
         }
+        EVP_CIPHER_free(aes256cbc);
         if (SSL_IS_TLS13(s))
             renew_ticket = 1;
     }