summaryrefslogtreecommitdiff
path: root/openssl/patches/handshake_cutthrough.patch
blob: 4f298399c52f8f5748b9796096d4db235b7bdccd (plain)
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
diff -uarp openssl-1.0.0.orig/apps/s_client.c openssl-1.0.0/apps/s_client.c
--- openssl-1.0.0.orig/apps/s_client.c	2009-12-16 15:28:28.000000000 -0500
+++ openssl-1.0.0/apps/s_client.c	2010-04-21 14:39:49.000000000 -0400
@@ -248,6 +248,7 @@ static void sc_usage(void)
 	BIO_printf(bio_err," -tlsextdebug      - hex dump of all TLS extensions received\n");
 	BIO_printf(bio_err," -status           - request certificate status from server\n");
 	BIO_printf(bio_err," -no_ticket        - disable use of RFC4507bis session tickets\n");
+	BIO_printf(bio_err," -cutthrough       - enable 1-RTT full-handshake for strong ciphers\n");
 #endif
 	}
 
@@ -304,6 +305,7 @@ int MAIN(int argc, char **argv)
 	EVP_PKEY *key = NULL;
 	char *CApath=NULL,*CAfile=NULL,*cipher=NULL;
 	int reconnect=0,badop=0,verify=SSL_VERIFY_NONE,bugs=0;
+	int cutthrough=0;
 	int crlf=0;
 	int write_tty,read_tty,write_ssl,read_ssl,tty_on,ssl_pending;
 	SSL_CTX *ctx=NULL;
@@ -533,6 +535,8 @@ int MAIN(int argc, char **argv)
 		else if	(strcmp(*argv,"-no_ticket") == 0)
 			{ off|=SSL_OP_NO_TICKET; }
 #endif
+		else if (strcmp(*argv,"-cutthrough") == 0)
+			cutthrough=1;
 		else if (strcmp(*argv,"-serverpref") == 0)
 			off|=SSL_OP_CIPHER_SERVER_PREFERENCE;
 		else if	(strcmp(*argv,"-cipher") == 0)
@@ -714,6 +718,15 @@ bad:
 	 */
 	if (sock_type == SOCK_DGRAM) SSL_CTX_set_read_ahead(ctx, 1);
 
+	/* Enable handshake cutthrough for client connections using
+	 * strong ciphers. */
+	if (cutthrough)
+		{
+		int ssl_mode = SSL_CTX_get_mode(ctx);
+		ssl_mode |= SSL_MODE_HANDSHAKE_CUTTHROUGH;
+		SSL_CTX_set_mode(ctx, ssl_mode);
+		}
+
 	if (state) SSL_CTX_set_info_callback(ctx,apps_ssl_info_callback);
 	if (cipher != NULL)
 		if(!SSL_CTX_set_cipher_list(ctx,cipher)) {
diff -uarp openssl-1.0.0.orig/ssl/s3_clnt.c openssl-1.0.0/ssl/s3_clnt.c
--- openssl-1.0.0.orig/ssl/s3_clnt.c	2010-02-27 19:24:24.000000000 -0500
+++ openssl-1.0.0/ssl/s3_clnt.c	2010-04-21 14:39:49.000000000 -0400
@@ -186,6 +186,18 @@ int ssl3_connect(SSL *s)
 	
 	s->in_handshake++;
 	if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
+#if 0	/* Send app data in separate packet, otherwise, some particular site
+	 * (only one site so far) closes the socket.
+	 * Note: there is a very small chance that two TCP packets
+	 * could be arriving at server combined into a single TCP packet,
+	 * then trigger that site to break. We haven't encounter that though.
+	 */
+	if (SSL_get_mode(s) & SSL_MODE_HANDSHAKE_CUTTHROUGH)
+		{
+		/* Send app data along with CCS/Finished */
+		s->s3->flags |= SSL3_FLAGS_DELAY_CLIENT_FINISHED;
+		}
+#endif
 
 	for (;;)
 		{
@@ -454,14 +468,31 @@ int ssl3_connect(SSL *s)
 				}
 			else
 				{
-#ifndef OPENSSL_NO_TLSEXT
-				/* Allow NewSessionTicket if ticket expected */
-				if (s->tlsext_ticket_expected)
-					s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
+				if ((SSL_get_mode(s) & SSL_MODE_HANDSHAKE_CUTTHROUGH) && SSL_get_cipher_bits(s, NULL) >= 128
+				    && s->s3->previous_server_finished_len == 0 /* no cutthrough on renegotiation (would complicate the state machine) */
+				   )
+					{
+					if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
+						{
+						s->state=SSL3_ST_CUTTHROUGH_COMPLETE;
+						s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
+						s->s3->delay_buf_pop_ret=0;
+						}
+					else
+						{
+						s->s3->tmp.next_state=SSL3_ST_CUTTHROUGH_COMPLETE;
+						}
+					}
 				else
+					{
+#ifndef OPENSSL_NO_TLSEXT
+					/* Allow NewSessionTicket if ticket expected */
+					if (s->tlsext_ticket_expected)
+						s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
+					else
 #endif
-				
-				s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
+						s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
+					}
 				}
 			s->init_num=0;
 			break;
@@ -512,6 +541,24 @@ int ssl3_connect(SSL *s)
 			s->state=s->s3->tmp.next_state;
 			break;
 
+		case SSL3_ST_CUTTHROUGH_COMPLETE:
+#ifndef OPENSSL_NO_TLSEXT
+			/* Allow NewSessionTicket if ticket expected */
+			if (s->tlsext_ticket_expected)
+				s->state=SSL3_ST_CR_SESSION_TICKET_A;
+			else
+#endif
+				s->state=SSL3_ST_CR_FINISHED_A;
+
+			/* SSL_write() will take care of flushing buffered data if
+			 * DELAY_CLIENT_FINISHED is set.
+			 */
+			if (!(s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED))
+				ssl_free_wbio_buffer(s);
+			ret = 1;
+			goto end;
+			/* break; */
+
 		case SSL_ST_OK:
 			/* clean a few things up */
 			ssl3_cleanup_key_block(s);
diff -uarp openssl-1.0.0.orig/ssl/s3_lib.c openssl-1.0.0/ssl/s3_lib.c
-- openssl-1.0.0.orig/ssl/s3_lib.c     2009-10-16 11:24:19.000000000 -0400
+++ openssl-1.0.0/ssl/s3_lib.c  2010-04-21 14:39:49.000000000 -0400
@@ -2551,9 +2551,22 @@ int ssl3_write(SSL *s, const void *buf, 
 
 static int ssl3_read_internal(SSL *s, void *buf, int len, int peek)
 	{
-	int ret;
+	int n,ret;
 	
 	clear_sys_error();
+	if ((s->s3->flags & SSL3_FLAGS_POP_BUFFER) && (s->wbio == s->bbio))
+		{
+		/* Deal with an application that calls SSL_read() when handshake data
+		 * is yet to be written.
+		 */
+		if (BIO_wpending(s->wbio) > 0)
+			{
+			s->rwstate=SSL_WRITING;
+			n=BIO_flush(s->wbio);
+			if (n <= 0) return(n);
+			s->rwstate=SSL_NOTHING;
+			}
+		}
 	if (s->s3->renegotiate) ssl3_renegotiate_check(s);
 	s->s3->in_read_app_data=1;
 	ret=s->method->ssl_read_bytes(s,SSL3_RT_APPLICATION_DATA,buf,len,peek);
diff -uarp openssl-1.0.0.orig/ssl/ssl.h openssl-1.0.0/ssl/ssl.h
--- openssl-1.0.0.orig/ssl/ssl.h	2010-01-06 12:37:38.000000000 -0500
+++ openssl-1.0.0/ssl/ssl.h	2010-04-21 16:57:49.000000000 -0400
@@ -605,6 +605,10 @@ typedef struct ssl_session_st
 /* Use small read and write buffers: (a) lazy allocate read buffers for
  * large incoming records, and (b) limit the size of outgoing records. */
 #define SSL_MODE_SMALL_BUFFERS 0x00000020L
+/* When set, clients may send application data before receipt of CCS
+ * and Finished.  This mode enables full-handshakes to 'complete' in
+ * one RTT. */
+#define SSL_MODE_HANDSHAKE_CUTTHROUGH 0x00000040L

 /* Note: SSL[_CTX]_set_{options,mode} use |= op on the previous value,
  * they cannot be used to clear bits. */
@@ -1097,10 +1101,12 @@ extern "C" {
 /* Is the SSL_connection established? */
 #define SSL_get_state(a)		SSL_state(a)
 #define SSL_is_init_finished(a)		(SSL_state(a) == SSL_ST_OK)
-#define SSL_in_init(a)			(SSL_state(a)&SSL_ST_INIT)
+#define SSL_in_init(a)			((SSL_state(a)&SSL_ST_INIT) && \
+                                  !SSL_cutthrough_complete(a))
 #define SSL_in_before(a)		(SSL_state(a)&SSL_ST_BEFORE)
 #define SSL_in_connect_init(a)		(SSL_state(a)&SSL_ST_CONNECT)
 #define SSL_in_accept_init(a)		(SSL_state(a)&SSL_ST_ACCEPT)
+int SSL_cutthrough_complete(const SSL *s);
 
 /* The following 2 states are kept in ssl->rstate when reads fail,
  * you should not need these */
Only in openssl-1.0.0/ssl: ssl.h.orig
diff -uarp openssl-1.0.0.orig/ssl/ssl3.h openssl-1.0.0/ssl/ssl3.h
-- openssl-1.0.0.orig/ssl/ssl3.h	2010-01-06 12:37:38.000000000 -0500
+++ openssl-1.0.0/ssl/ssl3.h	2010-04-21 14:39:49.000000000 -0400
@@ -456,6 +456,7 @@ typedef struct ssl3_state_st
 /*client */
 /* extra state */
 #define SSL3_ST_CW_FLUSH		(0x100|SSL_ST_CONNECT)
+#define SSL3_ST_CUTTHROUGH_COMPLETE	(0x101|SSL_ST_CONNECT)
 /* write to server */
 #define SSL3_ST_CW_CLNT_HELLO_A		(0x110|SSL_ST_CONNECT)
 #define SSL3_ST_CW_CLNT_HELLO_B		(0x111|SSL_ST_CONNECT)
diff -uarp openssl-1.0.0.orig/ssl/ssl_lib.c openssl-1.0.0/ssl/ssl_lib.c
--- openssl-1.0.0.orig/ssl/ssl_lib.c	2010-02-17 14:43:46.000000000 -0500
+++ openssl-1.0.0/ssl/ssl_lib.c	2010-04-21 17:02:45.000000000 -0400
@@ -3031,6 +3031,19 @@ void SSL_set_msg_callback(SSL *ssl, void
 	SSL_callback_ctrl(ssl, SSL_CTRL_SET_MSG_CALLBACK, (void (*)(void))cb);
 	}

+int SSL_cutthrough_complete(const SSL *s)
+	{
+	return (!s->server &&                 /* cutthrough only applies to clients */
+		!s->hit &&                        /* full-handshake */
+		s->version >= SSL3_VERSION &&
+		s->s3->in_read_app_data == 0 &&   /* cutthrough only applies to write() */
+		(SSL_get_mode((SSL*)s) & SSL_MODE_HANDSHAKE_CUTTHROUGH) &&  /* cutthrough enabled */
+		SSL_get_cipher_bits(s, NULL) >= 128 &&                      /* strong cipher choosen */
+		s->s3->previous_server_finished_len == 0 &&                 /* not a renegotiation handshake */
+		(s->state == SSL3_ST_CR_SESSION_TICKET_A ||                 /* ready to write app-data*/
+			s->state == SSL3_ST_CR_FINISHED_A));
+	}
+
 /* Allocates new EVP_MD_CTX and sets pointer to it into given pointer
  * vairable, freeing  EVP_MD_CTX previously stored in that variable, if
  * any. If EVP_MD pointer is passed, initializes ctx with this md
diff -uarp openssl-1.0.0.orig/ssl/ssltest.c openssl-1.0.0/ssl/ssltest.c
--- openssl-1.0.0.orig/ssl/ssltest.c	2010-01-24 11:57:38.000000000 -0500
+++ openssl-1.0.0/ssl/ssltest.c	2010-04-21 17:06:35.000000000 -0400
@@ -279,6 +279,7 @@ static void sv_usage(void)
 	fprintf(stderr," -test_cipherlist - verifies the order of the ssl cipher lists\n");
 	fprintf(stderr," -c_small_records - enable client side use of small SSL record buffers\n");
 	fprintf(stderr," -s_small_records - enable server side use of small SSL record buffers\n");
+	fprintf(stderr," -cutthrough      - enable 1-RTT full-handshake for strong ciphers\n");
 	}
 
 static void print_details(SSL *c_ssl, const char *prefix)
@@ -436,6 +437,7 @@ int main(int argc, char *argv[])
 	int ssl_mode = 0;
 	int c_small_records=0;
 	int s_small_records=0;
+	int cutthrough = 0;
 
 	verbose = 0;
 	debug = 0;
@@ -632,6 +634,10 @@ int main(int argc, char *argv[])
 			{
 			s_small_records = 1;
 			}
+		else if (strcmp(*argv, "-cutthrough") == 0)
+			{
+			cutthrough = 1;
+			}
 		else
 			{
 			fprintf(stderr,"unknown option %s\n",*argv);
@@ -782,6 +788,13 @@ bad:
 		ssl_mode |= SSL_MODE_SMALL_BUFFERS;
 		SSL_CTX_set_mode(s_ctx, ssl_mode);
 		}
+	ssl_mode = 0;
+	if (cutthrough)
+		{
+		ssl_mode = SSL_CTX_get_mode(c_ctx);
+		ssl_mode = SSL_MODE_HANDSHAKE_CUTTHROUGH;
+		SSL_CTX_set_mode(c_ctx, ssl_mode);
+		}
 
 #ifndef OPENSSL_NO_DH
 	if (!no_dhe)
diff -uarp openssl-1.0.0.orig/test/testssl openssl-1.0.0/test/testssl
--- openssl-1.0.0.orig/test/testssl	2006-03-10 18:06:27.000000000 -0500
+++ openssl-1.0.0/test/testssl	2010-04-21 16:50:13.000000000 -0400
@@ -79,6 +79,8 @@ $ssltest -server_auth -client_auth -s_sm
 echo test sslv2/sslv3 with both client and server authentication and small client and server buffers
 $ssltest -server_auth -client_auth -c_small_records -s_small_records $CA $extra || exit 1
 
+echo test sslv2/sslv3 with both client and server authentication and handshake cutthrough
+$ssltest -server_auth -client_auth -cutthrough $CA $extra || exit 1
 
 echo test sslv2 via BIO pair
 $ssltest -bio_pair -ssl2 $extra || exit 1