mirror/openssl
2
0
Fork 0
mirror of https://github.com/openssl/openssl.git synced 2024-11-21 01:15:20 +08:00
Code Issues Packages Projects Releases Wiki Activity

Fix DTLS retransmission from previous session.

Browse Source 
For DTLS we might need to retransmit messages from the previous session
so keep a copy of write context in DTLS retransmission buffers instead
of replacing it after sending CCS. CVE-2013-6450.
(cherry picked from commit 34628967f1)
This commit is contained in:
Dr. Stephen Henson 2013-12-20 15:26:50 +00:00
parent 560b34f2b0
commit 20b82b514d
3 changed files with 22 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
CHANGES
View File

@ -273,6 +273,11 @@
Changes between 1.0.1e and 1.0.2 [xx XXX xxxx]
*) Keep original DTLS digest and encryption contexts in retransmission
structures so we can use the previous session parameters if they need
to be resent. (CVE-2013-6450)
[Steve Henson]
*) TLS pad extension: draft-agl-tls-padding-02
Workaround for the "TLS hang bug" (see FAQ and PR#2771): if the

6
ssl/d1_both.c
View File

@ -214,6 +214,12 @@ dtls1_hm_fragment_new(unsigned long frag_len, int reassembly)
static void
dtls1_hm_fragment_free(hm_fragment *frag)
{
if (frag->msg_header.is_ccs)
{
EVP_CIPHER_CTX_free(frag->msg_header.saved_retransmit_state.enc_write_ctx);
EVP_MD_CTX_destroy(frag->msg_header.saved_retransmit_state.write_hash);
}
if (frag->fragment) OPENSSL_free(frag->fragment);
if (frag->reassembly) OPENSSL_free(frag->reassembly);
OPENSSL_free(frag);

17
ssl/t1_enc.c
View File

@ -414,15 +414,20 @@ int tls1_change_cipher_state(SSL *s, int which)
s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
else
s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
if (s->enc_write_ctx != NULL)
if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s))
reuse_dd = 1;
else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
else if ((s->enc_write_ctx=EVP_CIPHER_CTX_new()) == NULL)
goto err;
else
/* make sure it's intialized in case we exit later with an error */
EVP_CIPHER_CTX_init(s->enc_write_ctx);
dd= s->enc_write_ctx;
mac_ctx = ssl_replace_hash(&s->write_hash,NULL);
if (SSL_IS_DTLS(s))
{
mac_ctx = EVP_MD_CTX_create();
if (!mac_ctx)
goto err;
s->write_hash = mac_ctx;
}
else
mac_ctx = ssl_replace_hash(&s->write_hash,NULL);
#ifndef OPENSSL_NO_COMP
if (s->compress != NULL)
{