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Updates to conform with draft-ietf-tls-renegotiation-03.txt:

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1. Add provisional SCSV value.
2. Don't send SCSV and RI at same time.
3. Fatal error is SCSV received when renegotiating.
This commit is contained in:
Dr. Stephen Henson 2010-01-06 17:37:09 +00:00
parent dd792d6222
commit 76998a71bc
5 changed files with 16 additions and 8 deletions
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2
CHANGES
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@ -905,7 +905,7 @@
the updated NID creation version. This should correctly handle UTF8. the updated NID creation version. This should correctly handle UTF8.
[Steve Henson] [Steve Henson]
*) Implement draft-ietf-tls-renegotiation. Re-enable *) Implement draft-ietf-tls-renegotiation-03. Re-enable
renegotiation but require the extension as needed. Unfortunately, renegotiation but require the extension as needed. Unfortunately,
SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION turns out to be a SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION turns out to be a
bad idea. It has been replaced by bad idea. It has been replaced by

1
ssl/ssl.h
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@ -2207,6 +2207,7 @@ void ERR_load_SSL_strings(void);
#define SSL_R_REUSE_CERT_LENGTH_NOT_ZERO 216 #define SSL_R_REUSE_CERT_LENGTH_NOT_ZERO 216
#define SSL_R_REUSE_CERT_TYPE_NOT_ZERO 217 #define SSL_R_REUSE_CERT_TYPE_NOT_ZERO 217
#define SSL_R_REUSE_CIPHER_LIST_NOT_ZERO 218 #define SSL_R_REUSE_CIPHER_LIST_NOT_ZERO 218
#define SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING 345
#define SSL_R_SERVERHELLO_TLSEXT 275 #define SSL_R_SERVERHELLO_TLSEXT 275
#define SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED 277 #define SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED 277
#define SSL_R_SHORT_READ 219 #define SSL_R_SHORT_READ 219

6
ssl/ssl3.h
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@ -128,10 +128,8 @@
extern "C" { extern "C" {
#endif #endif
/* Magic Cipher Suite Value. NB: bogus value used for testing */ /* Signalling cipher suite value: from draft-ietf-tls-renegotiation-03.txt */
#ifndef SSL3_CK_SCSV #define SSL3_CK_SCSV 0x030000FF
#define SSL3_CK_SCSV 0x03000FEC
#endif
#define SSL3_CK_RSA_NULL_MD5 0x03000001 #define SSL3_CK_RSA_NULL_MD5 0x03000001
#define SSL3_CK_RSA_NULL_SHA 0x03000002 #define SSL3_CK_RSA_NULL_SHA 0x03000002

1
ssl/ssl_err.c
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@ -459,6 +459,7 @@ static ERR_STRING_DATA SSL_str_reasons[]=
{ERR_REASON(SSL_R_REUSE_CERT_LENGTH_NOT_ZERO),"reuse cert length not zero"}, {ERR_REASON(SSL_R_REUSE_CERT_LENGTH_NOT_ZERO),"reuse cert length not zero"},
{ERR_REASON(SSL_R_REUSE_CERT_TYPE_NOT_ZERO),"reuse cert type not zero"}, {ERR_REASON(SSL_R_REUSE_CERT_TYPE_NOT_ZERO),"reuse cert type not zero"},
{ERR_REASON(SSL_R_REUSE_CIPHER_LIST_NOT_ZERO),"reuse cipher list not zero"}, {ERR_REASON(SSL_R_REUSE_CIPHER_LIST_NOT_ZERO),"reuse cipher list not zero"},
{ERR_REASON(SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING),"scsv received when renegotiating"},
{ERR_REASON(SSL_R_SERVERHELLO_TLSEXT) ,"serverhello tlsext"}, {ERR_REASON(SSL_R_SERVERHELLO_TLSEXT) ,"serverhello tlsext"},
{ERR_REASON(SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED),"session id context uninitialized"}, {ERR_REASON(SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED),"session id context uninitialized"},
{ERR_REASON(SSL_R_SHORT_READ) ,"short read"}, {ERR_REASON(SSL_R_SHORT_READ) ,"short read"},

14
ssl/ssl_lib.c
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@ -1369,10 +1369,11 @@ 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); j = put_cb ? put_cb(c,p) : ssl_put_cipher_by_char(s,c,p);
p+=j; p+=j;
} }
/* If p == q, no ciphers and caller indicates an error, otherwise /* If p == q, no ciphers and caller indicates an error. Otherwise
* add SCSV if not renegotiating * add SCSV if no extensions (i.e. SSL3 is client_version)
* since spec RECOMMENDS not sending both RI and SCSV.
*/ */
if (p != q && !s->new_session) if (p != q && !s->new_session && s->client_version == SSL3_VERSION)
{ {
static SSL_CIPHER scsv = static SSL_CIPHER scsv =
{ {
@ -1418,6 +1419,13 @@ STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
(p[n-2] == ((SSL3_CK_SCSV >> 8) & 0xff)) && (p[n-2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
(p[n-1] == (SSL3_CK_SCSV & 0xff))) (p[n-1] == (SSL3_CK_SCSV & 0xff)))
{ {
/* SCSV fatal if renegotiating */
if (s->new_session)
{
SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
goto err;
}
s->s3->send_connection_binding = 1; s->s3->send_connection_binding = 1;
p += n; p += n;
#ifdef OPENSSL_RI_DEBUG #ifdef OPENSSL_RI_DEBUG