Fix DTLS1_BAD_VER regression

Commit 9cf0f187 in HEAD, and 68039af3 in 1.0.2, removed a version check
from dtls1_buffer_message() which was needed to distinguish between DTLS
1.x and Cisco's pre-standard version of DTLS (DTLS1_BAD_VER).

Based on an original patch by David Woodhouse <dwmw2@infradead.org>
RT#3703

Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit 5178a16c4375471d25e1f5ef5de46febb62a5529)

diff --git a/ssl/d1_both.c b/ssl/d1_both.c
index 2553c3de67209934b578d5316c9375da0f7c2564..21048003bcd3560d77f01285cb31acf4ee7ff814 100644 (file)
--- a/ssl/d1_both.c
+++ b/ssl/d1_both.c
@@ -1108,8 +1108,10 @@ int dtls1_buffer_message(SSL *s, int is_ccs)
     memcpy(frag->fragment, s->init_buf->data, s->init_num);
 
     if (is_ccs) {
+        /* For DTLS1_BAD_VER the header length is non-standard */
         OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
-                       DTLS1_CCS_HEADER_LENGTH == (unsigned int)s->init_num);
+                       ((s->version==DTLS1_BAD_VER)?3:DTLS1_CCS_HEADER_LENGTH)
+                       == (unsigned int)s->init_num);
     } else {
         OPENSSL_assert(s->d1->w_msg_hdr.msg_len +
                        DTLS1_HM_HEADER_LENGTH == (unsigned int)s->init_num);