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openssl/openssl-1.0.0-beta4-reneg.patch
Tomáš Mráz aabbc9ad89 - update to new upstream version, no soname bump needed 
- fix CVE-2009-3555 - note that the fix is bypassed if SSL_OP_ALL is used
    so the compatibility with unfixed clients is not broken. The protocol
    extension is also not final.
2009-11-12 15:51:40 +00:00

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diff -up openssl-1.0.0-beta4/apps/s_cb.c.reneg openssl-1.0.0-beta4/apps/s_cb.c
--- openssl-1.0.0-beta4/apps/s_cb.c.reneg 2009-10-15 20:48:47.000000000 +0200
+++ openssl-1.0.0-beta4/apps/s_cb.c 2009-11-12 15:02:30.000000000 +0100
@@ -669,6 +669,10 @@ void MS_CALLBACK tlsext_cb(SSL *s, int c
extname = "server ticket";
break;
+ case TLSEXT_TYPE_renegotiate:
+ extname = "renegotiate";
+ break;
+
#ifdef TLSEXT_TYPE_opaque_prf_input
case TLSEXT_TYPE_opaque_prf_input:
extname = "opaque PRF input";
diff -up openssl-1.0.0-beta4/apps/s_client.c.reneg openssl-1.0.0-beta4/apps/s_client.c
--- openssl-1.0.0-beta4/apps/s_client.c.reneg 2009-11-12 14:57:48.000000000 +0100
+++ openssl-1.0.0-beta4/apps/s_client.c 2009-11-12 15:01:48.000000000 +0100
@@ -343,6 +343,7 @@ static void sc_usage(void)
BIO_printf(bio_err," -status - request certificate status from server\n");
BIO_printf(bio_err," -no_ticket - disable use of RFC4507bis session tickets\n");
#endif
+ BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
}
#ifndef OPENSSL_NO_TLSEXT
@@ -657,6 +658,8 @@ int MAIN(int argc, char **argv)
#endif
else if (strcmp(*argv,"-serverpref") == 0)
off|=SSL_OP_CIPHER_SERVER_PREFERENCE;
+ else if (strcmp(*argv,"-legacy_renegotiation") == 0)
+ off|=SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION;
else if (strcmp(*argv,"-cipher") == 0)
{
if (--argc < 1) goto bad;
diff -up openssl-1.0.0-beta4/apps/s_server.c.reneg openssl-1.0.0-beta4/apps/s_server.c
--- openssl-1.0.0-beta4/apps/s_server.c.reneg 2009-11-12 14:57:48.000000000 +0100
+++ openssl-1.0.0-beta4/apps/s_server.c 2009-11-12 15:01:48.000000000 +0100
@@ -491,6 +491,7 @@ static void sv_usage(void)
BIO_printf(bio_err," not specified (default is %s)\n",TEST_CERT2);
BIO_printf(bio_err," -tlsextdebug - hex dump of all TLS extensions received\n");
BIO_printf(bio_err," -no_ticket - disable use of RFC4507bis session tickets\n");
+ BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
#endif
}
@@ -1013,6 +1014,8 @@ int MAIN(int argc, char *argv[])
verify_return_error = 1;
else if (strcmp(*argv,"-serverpref") == 0)
{ off|=SSL_OP_CIPHER_SERVER_PREFERENCE; }
+ else if (strcmp(*argv,"-legacy_renegotiation") == 0)
+ off|=SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION;
else if (strcmp(*argv,"-cipher") == 0)
{
if (--argc < 1) goto bad;
diff -up openssl-1.0.0-beta4/ssl/tls1.h.reneg openssl-1.0.0-beta4/ssl/tls1.h
--- openssl-1.0.0-beta4/ssl/tls1.h.reneg 2009-11-12 14:57:47.000000000 +0100
+++ openssl-1.0.0-beta4/ssl/tls1.h 2009-11-12 15:02:30.000000000 +0100
@@ -201,6 +201,9 @@ extern "C" {
# define TLSEXT_TYPE_opaque_prf_input ?? */
#endif
+/* Temporary extension type */
+#define TLSEXT_TYPE_renegotiate 0xff01
+
/* NameType value from RFC 3546 */
#define TLSEXT_NAMETYPE_host_name 0
/* status request value from RFC 3546 */
diff -up openssl-1.0.0-beta4/ssl/t1_lib.c.reneg openssl-1.0.0-beta4/ssl/t1_lib.c
--- openssl-1.0.0-beta4/ssl/t1_lib.c.reneg 2009-11-08 15:36:32.000000000 +0100
+++ openssl-1.0.0-beta4/ssl/t1_lib.c 2009-11-12 15:02:30.000000000 +0100
@@ -315,6 +315,30 @@ unsigned char *ssl_add_clienthello_tlsex
ret+=size_str;
}
+ /* Add the renegotiation option: TODOEKR switch */
+ {
+ int el;
+
+ if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
+ {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ if((limit - p - 4 - el) < 0) return NULL;
+
+ s2n(TLSEXT_TYPE_renegotiate,ret);
+ s2n(el,ret);
+
+ if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
+ {
+ SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ ret += el;
+ }
+
#ifndef OPENSSL_NO_EC
if (s->tlsext_ecpointformatlist != NULL)
{
@@ -490,6 +514,31 @@ unsigned char *ssl_add_serverhello_tlsex
s2n(TLSEXT_TYPE_server_name,ret);
s2n(0,ret);
}
+
+ if(s->s3->send_connection_binding)
+ {
+ int el;
+
+ if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
+ {
+ SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ if((limit - p - 4 - el) < 0) return NULL;
+
+ s2n(TLSEXT_TYPE_renegotiate,ret);
+ s2n(el,ret);
+
+ if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
+ {
+ SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
+ return NULL;
+ }
+
+ ret += el;
+ }
+
#ifndef OPENSSL_NO_EC
if (s->tlsext_ecpointformatlist != NULL)
{
@@ -574,11 +623,23 @@ int ssl_parse_clienthello_tlsext(SSL *s,
unsigned short size;
unsigned short len;
unsigned char *data = *p;
+ int renegotiate_seen = 0;
+
s->servername_done = 0;
s->tlsext_status_type = -1;
+ s->s3->send_connection_binding = 0;
if (data >= (d+n-2))
+ {
+ if (s->new_session
+ && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
+ {
+ /* We should always see one extension: the renegotiate extension */
+ *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
+ return 0;
+ }
return 1;
+ }
n2s(data,len);
if (data > (d+n-len))
@@ -790,6 +851,12 @@ int ssl_parse_clienthello_tlsext(SSL *s,
return 0;
}
}
+ else if (type == TLSEXT_TYPE_renegotiate)
+ {
+ if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
+ return 0;
+ renegotiate_seen = 1;
+ }
else if (type == TLSEXT_TYPE_status_request
&& s->ctx->tlsext_status_cb)
{
@@ -894,6 +961,14 @@ int ssl_parse_clienthello_tlsext(SSL *s,
/* session ticket processed earlier */
data+=size;
}
+
+ if (s->new_session && !renegotiate_seen
+ && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
+ {
+ *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
+ return 0;
+ }
+
*p = data;
return 1;
@@ -905,11 +980,22 @@ int ssl_parse_serverhello_tlsext(SSL *s,
unsigned short size;
unsigned short len;
unsigned char *data = *p;
-
int tlsext_servername = 0;
+ int renegotiate_seen = 0;
if (data >= (d+n-2))
+ {
+ /* Because the client does not see any renegotiation during an
+ attack, we must enforce this on all server hellos, even the
+ first */
+ if (!(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
+ {
+ /* We should always see one extension: the renegotiate extension */
+ *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
+ return 0;
+ }
return 1;
+ }
n2s(data,len);
@@ -1025,7 +1111,12 @@ int ssl_parse_serverhello_tlsext(SSL *s,
/* Set flag to expect CertificateStatus message */
s->tlsext_status_expected = 1;
}
-
+ else if (type == TLSEXT_TYPE_renegotiate)
+ {
+ if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
+ return 0;
+ renegotiate_seen = 1;
+ }
data+=size;
}
@@ -1035,6 +1126,13 @@ int ssl_parse_serverhello_tlsext(SSL *s,
return 0;
}
+ if (!renegotiate_seen
+ && !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
+ {
+ *al = SSL_AD_ILLEGAL_PARAMETER; /* is this the right alert? */
+ return 0;
+ }
+
if (!s->hit && tlsext_servername == 1)
{
if (s->tlsext_hostname)
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