aboutsummaryrefslogtreecommitdiffstats
path: root/patches/openssl-0.9.8g-tls-extensions.patch
blob: 8ccbfaa29ddf6786e4058e7a521e491596198a02 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
This patch adds support for TLS SessionTicket extension (RFC 5077) for
the parts used by EAP-FAST (RFC 4851).

This is based on the patch from Alexey Kobozev <akobozev@cisco.com>
(sent to openssl-dev mailing list on Tue, 07 Jun 2005 15:40:58 +0300).

OpenSSL 0.9.8g does not enable TLS extension support by default, so it
will need to be enabled by adding enable-tlsext to config script
command line.


diff -upr openssl-0.9.8g.orig/ssl/s3_clnt.c openssl-0.9.8g/ssl/s3_clnt.c
--- openssl-0.9.8g.orig/ssl/s3_clnt.c	2007-08-31 03:28:51.000000000 +0300
+++ openssl-0.9.8g/ssl/s3_clnt.c	2008-04-15 17:11:46.000000000 +0300
@@ -727,6 +727,20 @@ int ssl3_get_server_hello(SSL *s)
 		goto f_err;
 		}
 
+#ifndef OPENSSL_NO_TLSEXT
+	/* check if we want to resume the session based on external pre-shared secret */
+	if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
+	{
+		SSL_CIPHER *pref_cipher=NULL;
+		s->session->master_key_length=sizeof(s->session->master_key);
+		if (s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
+			NULL, &pref_cipher, s->tls_session_secret_cb_arg))
+		{
+			s->session->cipher=pref_cipher ? pref_cipher : ssl_get_cipher_by_char(s,p+j);
+		}
+	}
+#endif /* OPENSSL_NO_TLSEXT */
+
 	if (j != 0 && j == s->session->session_id_length
 	    && memcmp(p,s->session->session_id,j) == 0)
 	    {
diff -upr openssl-0.9.8g.orig/ssl/s3_srvr.c openssl-0.9.8g/ssl/s3_srvr.c
--- openssl-0.9.8g.orig/ssl/s3_srvr.c	2007-09-30 21:55:59.000000000 +0300
+++ openssl-0.9.8g/ssl/s3_srvr.c	2008-04-15 17:10:37.000000000 +0300
@@ -928,6 +928,59 @@ int ssl3_get_client_hello(SSL *s)
 			SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 			goto err;
 		}
+
+	/* Check if we want to use external pre-shared secret for this
+	 * handshake for not reused session only. We need to generate
+	 * server_random before calling tls_session_secret_cb in order to allow
+	 * SessionTicket processing to use it in key derivation. */
+	{
+		unsigned long Time;
+		unsigned char *pos;
+		Time=(unsigned long)time(NULL);			/* Time */
+		pos=s->s3->server_random;
+		l2n(Time,pos);
+		if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
+		{
+			al=SSL_AD_INTERNAL_ERROR;
+			goto f_err;
+		}
+	}
+
+	if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
+	{
+		SSL_CIPHER *pref_cipher=NULL;
+
+		s->session->master_key_length=sizeof(s->session->master_key);
+		if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length, 
+			ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
+		{
+			s->hit=1;
+			s->session->ciphers=ciphers;
+			s->session->verify_result=X509_V_OK;
+			
+			ciphers=NULL;
+			
+			/* check if some cipher was preferred by call back */
+			pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
+			if (pref_cipher == NULL)
+				{
+				al=SSL_AD_HANDSHAKE_FAILURE;
+				SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
+				goto f_err;
+				}
+
+			s->session->cipher=pref_cipher;
+
+			if (s->cipher_list)
+				sk_SSL_CIPHER_free(s->cipher_list);
+
+			if (s->cipher_list_by_id)
+				sk_SSL_CIPHER_free(s->cipher_list_by_id);
+
+			s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
+			s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
+		}
+	}
 #endif
 	/* Worst case, we will use the NULL compression, but if we have other
 	 * options, we will now look for them.  We have i-1 compression
@@ -1066,16 +1119,22 @@ int ssl3_send_server_hello(SSL *s)
 	unsigned char *buf;
 	unsigned char *p,*d;
 	int i,sl;
-	unsigned long l,Time;
+	unsigned long l;
+#ifdef OPENSSL_NO_TLSEXT
+	unsigned long Time;
+#endif
 
 	if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 		{
 		buf=(unsigned char *)s->init_buf->data;
+#ifdef OPENSSL_NO_TLSEXT
 		p=s->s3->server_random;
+		/* Generate server_random if it was not needed previously */
 		Time=(unsigned long)time(NULL);			/* Time */
 		l2n(Time,p);
 		if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 			return -1;
+#endif
 		/* Do the message type and length last */
 		d=p= &(buf[4]);
 
diff -upr openssl-0.9.8g.orig/ssl/ssl.h openssl-0.9.8g/ssl/ssl.h
--- openssl-0.9.8g.orig/ssl/ssl.h	2007-10-19 10:42:38.000000000 +0300
+++ openssl-0.9.8g/ssl/ssl.h	2008-04-15 17:10:37.000000000 +0300
@@ -342,6 +342,7 @@ extern "C" {
  * 'struct ssl_st *' function parameters used to prototype callbacks
  * in SSL_CTX. */
 typedef struct ssl_st *ssl_crock_st;
+typedef struct tls_extension_st TLS_EXTENSION;
 
 /* used to hold info on the particular ciphers used */
 typedef struct ssl_cipher_st
@@ -363,6 +364,8 @@ DECLARE_STACK_OF(SSL_CIPHER)
 typedef struct ssl_st SSL;
 typedef struct ssl_ctx_st SSL_CTX;
 
+typedef int (*tls_session_secret_cb_fn)(SSL *s, void *secret, int *secret_len, STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg);
+
 /* Used to hold functions for SSLv2 or SSLv3/TLSv1 functions */
 typedef struct ssl_method_st
 	{
@@ -1004,6 +1007,14 @@ struct ssl_st
 	                       */
 	/* RFC4507 session ticket expected to be received or sent */
 	int tlsext_ticket_expected;
+
+	/* TLS extensions */
+	TLS_EXTENSION *tls_extension;
+
+	/* TLS pre-shared secret session resumption */
+	tls_session_secret_cb_fn tls_session_secret_cb;
+	void *tls_session_secret_cb_arg;
+
 	SSL_CTX * initial_ctx; /* initial ctx, used to store sessions */
 #define session_ctx initial_ctx
 #else
@@ -1589,6 +1600,12 @@ void *SSL_COMP_get_compression_methods(v
 int SSL_COMP_add_compression_method(int id,void *cm);
 #endif
 
+/* TLS extensions functions */
+int SSL_set_hello_extension(SSL *s, int ext_type, void *ext_data, int ext_len);
+
+/* Pre-shared secret session resumption functions */
+int SSL_set_session_secret_cb(SSL *s, tls_session_secret_cb_fn tls_session_secret_cb, void *arg);
+
 /* BEGIN ERROR CODES */
 /* The following lines are auto generated by the script mkerr.pl. Any changes
  * made after this point may be overwritten when the script is next run.
@@ -1778,6 +1795,7 @@ void ERR_load_SSL_strings(void);
 #define SSL_F_TLS1_ENC					 210
 #define SSL_F_TLS1_SETUP_KEY_BLOCK			 211
 #define SSL_F_WRITE_PENDING				 212
+#define SSL_F_SSL_SET_HELLO_EXTENSION			 213
 
 /* Reason codes. */
 #define SSL_R_APP_DATA_IN_HANDSHAKE			 100
diff -upr openssl-0.9.8g.orig/ssl/ssl_err.c openssl-0.9.8g/ssl/ssl_err.c
--- openssl-0.9.8g.orig/ssl/ssl_err.c	2007-10-11 17:36:59.000000000 +0300
+++ openssl-0.9.8g/ssl/ssl_err.c	2008-04-15 17:10:37.000000000 +0300
@@ -250,6 +250,7 @@ static ERR_STRING_DATA SSL_str_functs[]=
 {ERR_FUNC(SSL_F_TLS1_ENC),	"TLS1_ENC"},
 {ERR_FUNC(SSL_F_TLS1_SETUP_KEY_BLOCK),	"TLS1_SETUP_KEY_BLOCK"},
 {ERR_FUNC(SSL_F_WRITE_PENDING),	"WRITE_PENDING"},
+{ERR_FUNC(SSL_F_SSL_SET_HELLO_EXTENSION), "SSL_set_hello_extension"},
 {0,NULL}
 	};
 
diff -upr openssl-0.9.8g.orig/ssl/ssl_sess.c openssl-0.9.8g/ssl/ssl_sess.c
--- openssl-0.9.8g.orig/ssl/ssl_sess.c	2007-10-19 10:36:34.000000000 +0300
+++ openssl-0.9.8g/ssl/ssl_sess.c	2008-04-15 17:10:37.000000000 +0300
@@ -704,6 +704,52 @@ long SSL_CTX_get_timeout(const SSL_CTX *
 	return(s->session_timeout);
 	}
 
+#ifndef OPENSSL_NO_TLSEXT
+int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 
+	STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg)
+{
+	if (s == NULL) return(0);
+	s->tls_session_secret_cb = tls_session_secret_cb;
+	s->tls_session_secret_cb_arg = arg;
+	return(1);
+}
+
+int SSL_set_hello_extension(SSL *s, int ext_type, void *ext_data, int ext_len)
+{
+	if(s->version >= TLS1_VERSION)
+	{
+		if(s->tls_extension)
+		{
+			OPENSSL_free(s->tls_extension);
+			s->tls_extension = NULL;
+		}
+
+		s->tls_extension = OPENSSL_malloc(sizeof(TLS_EXTENSION) + ext_len);
+		if(!s->tls_extension)
+		{
+			SSLerr(SSL_F_SSL_SET_HELLO_EXTENSION, ERR_R_MALLOC_FAILURE);
+			return 0;
+		}
+
+		s->tls_extension->type = ext_type;
+
+		if(ext_data)
+		{
+			s->tls_extension->length = ext_len;
+			s->tls_extension->data = s->tls_extension + 1;
+			memcpy(s->tls_extension->data, ext_data, ext_len);
+		} else {
+			s->tls_extension->length = 0;
+			s->tls_extension->data = NULL;
+		}
+
+		return 1;
+	}
+
+	return 0;
+}
+#endif /* OPENSSL_NO_TLSEXT */
+
 typedef struct timeout_param_st
 	{
 	SSL_CTX *ctx;
diff -upr openssl-0.9.8g.orig/ssl/t1_lib.c openssl-0.9.8g/ssl/t1_lib.c
--- openssl-0.9.8g.orig/ssl/t1_lib.c	2007-10-19 10:44:10.000000000 +0300
+++ openssl-0.9.8g/ssl/t1_lib.c	2008-04-15 17:10:37.000000000 +0300
@@ -105,6 +105,12 @@ int tls1_new(SSL *s)
 
 void tls1_free(SSL *s)
 	{
+#ifndef OPENSSL_NO_TLSEXT
+	if(s->tls_extension)
+	{
+		OPENSSL_free(s->tls_extension);
+	}
+#endif
 	ssl3_free(s);
 	}
 
@@ -174,8 +180,24 @@ unsigned char *ssl_add_clienthello_tlsex
 		int ticklen;
 		if (s->session && s->session->tlsext_tick)
 			ticklen = s->session->tlsext_ticklen;
+		else if (s->session && s->tls_extension &&
+			s->tls_extension->type == TLSEXT_TYPE_session_ticket &&
+			s->tls_extension->data)
+		{
+			ticklen = s->tls_extension->length;
+			s->session->tlsext_tick = OPENSSL_malloc(ticklen);
+			if (!s->session->tlsext_tick)
+				return NULL;
+			memcpy(s->session->tlsext_tick, s->tls_extension->data,
+			       ticklen);
+			s->session->tlsext_ticklen = ticklen;
+		}
 		else
 			ticklen = 0;
+		if (ticklen == 0 && s->tls_extension &&
+		    s->tls_extension->type == TLSEXT_TYPE_session_ticket &&
+		    s->tls_extension->data == NULL)
+			goto skip_ext;
 		/* Check for enough room 2 for extension type, 2 for len
  		 * rest for ticket
   		 */
@@ -189,6 +211,7 @@ unsigned char *ssl_add_clienthello_tlsex
 			ret += ticklen;
 			}
 		}
+		skip_ext:
 
 	if ((extdatalen = ret-p-2)== 0) 
 		return p;
@@ -543,6 +566,8 @@ int tls1_process_ticket(SSL *s, unsigned
 				s->tlsext_ticket_expected = 1;
 				return 0;	/* Cache miss */
 				}
+			if (s->tls_session_secret_cb)
+				return 0;
 			return tls_decrypt_ticket(s, p, size, session_id, len,
 									ret);
 			}
diff -upr openssl-0.9.8g.orig/ssl/tls1.h openssl-0.9.8g/ssl/tls1.h
--- openssl-0.9.8g.orig/ssl/tls1.h	2007-08-28 04:12:44.000000000 +0300
+++ openssl-0.9.8g/ssl/tls1.h	2008-04-15 17:10:37.000000000 +0300
@@ -365,6 +365,14 @@ SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TLSEXT_SER
 #define TLS_MD_MASTER_SECRET_CONST    "\x6d\x61\x73\x74\x65\x72\x20\x73\x65\x63\x72\x65\x74"  /*master secret*/
 #endif
 
+/* TLS extension struct */
+struct tls_extension_st
+{
+	unsigned short type;
+	unsigned short length;
+	void *data;
+};
+
 #ifdef  __cplusplus
 }
 #endif
diff -upr openssl-0.9.8g.orig/util/ssleay.num openssl-0.9.8g/util/ssleay.num
--- openssl-0.9.8g.orig/util/ssleay.num	2007-08-13 01:31:16.000000000 +0300
+++ openssl-0.9.8g/util/ssleay.num	2008-04-15 17:10:37.000000000 +0300
@@ -241,3 +241,5 @@ SSL_CTX_sess_get_remove_cb              
 SSL_set_SSL_CTX                         290	EXIST::FUNCTION:
 SSL_get_servername                      291	EXIST::FUNCTION:TLSEXT
 SSL_get_servername_type                 292	EXIST::FUNCTION:TLSEXT
+SSL_set_hello_extension			305	EXIST::FUNCTION:TLSEXT
+SSL_set_session_secret_cb		306	EXIST::FUNCTION:TLSEXT