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Add support for magic cipher suite value (MCSV). Make secure renegotiation

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work in SSLv3: initial handshake has no extensions but includes MCSV, if
server indicates RI support then renegotiation handshakes include RI.

NB: current MCSV value is bogus for testing only, will be updated when we
have an official value.

Change mismatch alerts to handshake_failure as required by spec.

Also have some debugging fprintfs so we can clearly see what is going on
if OPENSSL_RI_DEBUG is set.
This commit is contained in:
Dr. Stephen Henson 2009-12-08 13:14:03 +00:00
parent 8025e25113
commit 13f6d57b1e
7 changed files with 62 additions and 15 deletions
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5
CHANGES
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@ -867,15 +867,14 @@
the updated NID creation version. This should correctly handle UTF8.
[Steve Henson]
*) Implement
https://svn.resiprocate.org/rep/ietf-drafts/ekr/draft-rescorla-tls-renegotiate.txt. Re-enable
*) Implement draft-ietf-tls-renegotiation. Re-enable
renegotiation but require the extension as needed. Unfortunately,
SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION turns out to be a
bad idea. It has been replaced by
SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION which can be set with
SSL_CTX_set_options(). This is really not recommended unless you
know what you are doing.
[Eric Rescorla <ekr@networkresonance.com> and Ben Laurie]
[Eric Rescorla <ekr@networkresonance.com>, Ben Laurie, Steve Henson]
*) Fixes to stateless session resumption handling. Use initial_ctx when
issuing and attempting to decrypt tickets in case it has changed during

2
ssl/s3_clnt.c
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@ -912,7 +912,7 @@ int ssl3_get_server_hello(SSL *s)
#ifndef OPENSSL_NO_TLSEXT
/* TLS extensions*/
if (s->version > SSL3_VERSION)
if (s->version >= SSL3_VERSION)
{
if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
{

2
ssl/s3_srvr.c
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@ -1015,7 +1015,7 @@ int ssl3_get_client_hello(SSL *s)
#ifndef OPENSSL_NO_TLSEXT
/* TLS extensions*/
if (s->version > SSL3_VERSION)
if (s->version >= SSL3_VERSION)
{
if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
{

3
ssl/ssl3.h
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@ -128,6 +128,9 @@
extern "C" {
#endif
/* Magic Cipher Suite Value. NB: bogus value used for testing */
#define SSL3_CK_MCSV 0x03000FEC
#define SSL3_CK_RSA_NULL_MD5 0x03000001
#define SSL3_CK_RSA_NULL_SHA 0x03000002
#define SSL3_CK_RSA_RC4_40_MD5 0x03000003

31
ssl/ssl_lib.c
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@ -1357,6 +1357,22 @@ int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p,
j = put_cb ? put_cb(c,p) : ssl_put_cipher_by_char(s,c,p);
p+=j;
}
/* If p == q, no ciphers and caller indicates an error, otherwise
* add MCSV
*/
if (p != q)
{
static SSL_CIPHER msvc =
{
0, NULL, SSL3_CK_MCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
j = put_cb ? put_cb(&msvc,p) : ssl_put_cipher_by_char(s,&msvc,p);
p+=j;
#ifdef OPENSSL_RI_DEBUG
fprintf(stderr, "MCSV sent by client\n");
#endif
}
return(p-q);
}
@ -1367,6 +1383,8 @@ STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
STACK_OF(SSL_CIPHER) *sk;
int i,n;
s->s3->send_connection_binding = 0;
n=ssl_put_cipher_by_char(s,NULL,NULL);
if ((num%n) != 0)
{
@ -1383,6 +1401,19 @@ STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
for (i=0; i<num; i+=n)
{
/* Check for MCSV */
if ((n != 3 || !p[0]) &&
(p[n-2] == ((SSL3_CK_MCSV >> 8) & 0xff)) &&
(p[n-1] == (SSL3_CK_MCSV & 0xff)))
{
s->s3->send_connection_binding = 1;
p += n;
#ifdef OPENSSL_RI_DEBUG
fprintf(stderr, "MCSV received by server\n");
#endif
continue;
}
c=ssl_get_cipher_by_char(s,p);
p+=n;
if (c != NULL)

10
ssl/t1_lib.c
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@ -275,8 +275,9 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned cha
int extdatalen=0;
unsigned char *ret = p;
/* don't add extensions for SSLv3 */
if (s->client_version == SSL3_VERSION)
/* don't add extensions for SSLv3 unless doing secure renegotiation */
if (s->client_version == SSL3_VERSION
&& !s->s3->send_connection_binding)
return p;
ret+=2;
@ -504,8 +505,8 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned cha
int extdatalen=0;
unsigned char *ret = p;
/* don't add extensions for SSLv3 */
if (s->version == SSL3_VERSION)
/* don't add extensions for SSLv3, unless doing secure renegotiation */
if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
return p;
ret+=2;
@ -633,7 +634,6 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, in
s->servername_done = 0;
s->tlsext_status_type = -1;
s->s3->send_connection_binding = 0;
if (data >= (d+n-2))
{

24
ssl/t1_reneg.c
View File

@ -130,10 +130,14 @@ int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
memcpy(p, s->s3->previous_client_finished,
s->s3->previous_client_finished_len);
#ifdef OPENSSL_RI_DEBUG
fprintf(stderr, "RI extension sent by client\n");
#endif
}
*len=s->s3->previous_client_finished_len + 1;
return 1;
}
@ -166,7 +170,7 @@ int ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len,
if(ilen != s->s3->previous_client_finished_len)
{
SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH);
*al=SSL_AD_ILLEGAL_PARAMETER;
*al=SSL_AD_HANDSHAKE_FAILURE;
return 0;
}
@ -174,9 +178,12 @@ int ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len,
s->s3->previous_client_finished_len))
{
SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH);
*al=SSL_AD_ILLEGAL_PARAMETER;
*al=SSL_AD_HANDSHAKE_FAILURE;
return 0;
}
#ifdef OPENSSL_RI_DEBUG
fprintf(stderr, "RI extension received by server\n");
#endif
s->s3->send_connection_binding=1;
@ -206,6 +213,9 @@ int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
memcpy(p, s->s3->previous_server_finished,
s->s3->previous_server_finished_len);
#ifdef OPENSSL_RI_DEBUG
fprintf(stderr, "RI extension sent by server\n");
#endif
}
*len=s->s3->previous_client_finished_len
@ -249,7 +259,7 @@ int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len,
if(ilen != expected_len)
{
SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH);
*al=SSL_AD_ILLEGAL_PARAMETER;
*al=SSL_AD_HANDSHAKE_FAILURE;
return 0;
}
@ -257,7 +267,7 @@ int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len,
s->s3->previous_client_finished_len))
{
SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH);
*al=SSL_AD_ILLEGAL_PARAMETER;
*al=SSL_AD_HANDSHAKE_FAILURE;
return 0;
}
d += s->s3->previous_client_finished_len;
@ -269,6 +279,10 @@ int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len,
*al=SSL_AD_ILLEGAL_PARAMETER;
return 0;
}
#ifdef OPENSSL_RI_DEBUG
fprintf(stderr, "RI extension received by client\n");
#endif
s->s3->send_connection_binding=1;
return 1;
}