Fix d2i_SSL_SESSION for DTLS1_BAD_VER

Some Cisco appliances use a pre-standard version number for DTLS. We support
this as DTLS1_BAD_VER within the code.

This change fixes d2i_SSL_SESSION for that DTLS version.

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

RT#3704
Reviewed-by: NTim Hudson <tjh@openssl.org>

ssl/dtls1.h

@@ -86,6 +86,7 @@ extern "C" {
 # define DTLS1_VERSION                   0xFEFF
 # define DTLS1_2_VERSION                 0xFEFD
 # define DTLS_MAX_VERSION                DTLS1_2_VERSION
+# define DTLS1_VERSION_MAJOR             0xFE
 
 # define DTLS1_BAD_VER                   0x0100
 

ssl/ssl_asn1.c

@@ -410,7 +410,9 @@ SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
     os.data = NULL;
     os.length = 0;
     M_ASN1_D2I_get_x(ASN1_OCTET_STRING, osp, d2i_ASN1_OCTET_STRING);
-    if ((ssl_version >> 8) >= SSL3_VERSION_MAJOR) {
+    if ((ssl_version >> 8) == SSL3_VERSION_MAJOR
+        || (ssl_version >> 8) == DTLS1_VERSION_MAJOR
+        || ssl_version == DTLS1_BAD_VER) {
         if (os.length != 2) {
             c.error = SSL_R_CIPHER_CODE_WRONG_LENGTH;
             c.line = __LINE__;