2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
113 #include "ssl_locl.h"
114 #include <openssl/buffer.h>
115 #include <openssl/rand.h>
116 #include <openssl/objects.h>
117 #include <openssl/evp.h>
119 static SSL_METHOD *ssl23_get_server_method(int ver);
120 int ssl23_get_client_hello(SSL *s);
121 static SSL_METHOD *ssl23_get_server_method(int ver)
123 #ifndef OPENSSL_NO_SSL2
124 if (ver == SSL2_VERSION)
125 return(SSLv2_server_method());
127 if (ver == SSL3_VERSION)
128 return(SSLv3_server_method());
129 else if (ver == TLS1_VERSION)
130 return(TLSv1_server_method());
135 SSL_METHOD *SSLv23_server_method(void)
138 static SSL_METHOD SSLv23_server_data;
142 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
144 memcpy((char *)&SSLv23_server_data,
145 (char *)sslv23_base_method(),sizeof(SSL_METHOD));
146 SSLv23_server_data.ssl_accept=ssl23_accept;
147 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
150 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
152 return(&SSLv23_server_data);
155 int ssl23_accept(SSL *s)
158 unsigned long Time=time(NULL);
159 void (*cb)(const SSL *ssl,int type,int val)=NULL;
163 RAND_add(&Time,sizeof(Time),0);
167 if (s->info_callback != NULL)
169 else if (s->ctx->info_callback != NULL)
170 cb=s->ctx->info_callback;
173 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
183 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
184 case SSL_ST_OK|SSL_ST_ACCEPT:
187 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
189 /* s->version=SSL3_VERSION; */
190 s->type=SSL_ST_ACCEPT;
192 if (s->init_buf == NULL)
194 if ((buf=BUF_MEM_new()) == NULL)
199 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
207 ssl3_init_finished_mac(s);
209 s->state=SSL23_ST_SR_CLNT_HELLO_A;
210 s->ctx->stats.sess_accept++;
214 case SSL23_ST_SR_CLNT_HELLO_A:
215 case SSL23_ST_SR_CLNT_HELLO_B:
218 ret=ssl23_get_client_hello(s);
219 if (ret >= 0) cb=NULL;
224 SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
230 if ((cb != NULL) && (s->state != state))
234 cb(s,SSL_CB_ACCEPT_LOOP,1);
241 cb(s,SSL_CB_ACCEPT_EXIT,ret);
246 int ssl23_get_client_hello(SSL *s)
248 char buf_space[11]; /* Request this many bytes in initial read.
249 * We can detect SSL 3.0/TLS 1.0 Client Hellos
250 * ('type == 3') correctly only when the following
251 * is in a single record, which is not guaranteed by
252 * the protocol specification:
255 * 1/2 version > record header
258 * 6-8 length > Client Hello message
259 * 9/10 client_version /
261 char *buf= &(buf_space[0]);
262 unsigned char *p,*d,*d_len,*dd;
264 unsigned int csl,sil,cl;
268 #ifndef OPENSSL_NO_RSA
269 int use_sslv2_strong=0;
272 if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
274 /* read the initial header */
277 if (!ssl3_setup_buffers(s)) goto err;
279 n=ssl23_read_bytes(s, sizeof buf_space);
280 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
286 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
291 if ((p[3] == 0x00) && (p[4] == 0x02))
293 v[0]=p[3]; v[1]=p[4];
295 if (!(s->options & SSL_OP_NO_SSLv2))
298 else if (p[3] == SSL3_VERSION_MAJOR)
300 v[0]=p[3]; v[1]=p[4];
302 if (p[4] >= TLS1_VERSION_MINOR)
304 if (!(s->options & SSL_OP_NO_TLSv1))
306 s->version=TLS1_VERSION;
307 /* type=2; */ /* done later to survive restarts */
308 s->state=SSL23_ST_SR_CLNT_HELLO_B;
310 else if (!(s->options & SSL_OP_NO_SSLv3))
312 s->version=SSL3_VERSION;
314 s->state=SSL23_ST_SR_CLNT_HELLO_B;
316 else if (!(s->options & SSL_OP_NO_SSLv2))
321 else if (!(s->options & SSL_OP_NO_SSLv3))
323 s->version=SSL3_VERSION;
325 s->state=SSL23_ST_SR_CLNT_HELLO_B;
327 else if (!(s->options & SSL_OP_NO_SSLv2))
332 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
333 (p[1] == SSL3_VERSION_MAJOR) &&
334 (p[5] == SSL3_MT_CLIENT_HELLO) &&
335 ((p[3] == 0 && p[4] < 5 /* silly record length? */)
339 * SSLv3 or tls1 header
342 v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
343 /* We must look at client_version inside the Client Hello message
344 * to get the correct minor version.
345 * However if we have only a pathologically small fragment of the
346 * Client Hello message, this would be difficult, and we'd have
347 * to read more records to find out.
348 * No known SSL 3.0 client fragments ClientHello like this,
349 * so we simply assume TLS 1.0 to avoid protocol version downgrade
351 if (p[3] == 0 && p[4] < 6)
354 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
357 v[1] = TLS1_VERSION_MINOR;
361 v[1]=p[10]; /* minor version according to client_version */
362 if (v[1] >= TLS1_VERSION_MINOR)
364 if (!(s->options & SSL_OP_NO_TLSv1))
366 s->version=TLS1_VERSION;
369 else if (!(s->options & SSL_OP_NO_SSLv3))
371 s->version=SSL3_VERSION;
377 /* client requests SSL 3.0 */
378 if (!(s->options & SSL_OP_NO_SSLv3))
380 s->version=SSL3_VERSION;
383 else if (!(s->options & SSL_OP_NO_TLSv1))
385 /* we won't be able to use TLS of course,
386 * but this will send an appropriate alert */
387 s->version=TLS1_VERSION;
392 else if ((strncmp("GET ", (char *)p,4) == 0) ||
393 (strncmp("POST ",(char *)p,5) == 0) ||
394 (strncmp("HEAD ",(char *)p,5) == 0) ||
395 (strncmp("PUT ", (char *)p,4) == 0))
397 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
400 else if (strncmp("CONNECT",(char *)p,7) == 0)
402 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
407 if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
409 /* we have SSLv3/TLSv1 in an SSLv2 header
410 * (other cases skip this state) */
414 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
417 n=((p[0]&0x7f)<<8)|p[1];
420 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
424 j=ssl23_read_bytes(s,n+2);
425 if (j <= 0) return(j);
427 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
429 s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */
436 d=(unsigned char *)s->init_buf->data;
437 if ((csl+sil+cl+11) != s->packet_length)
439 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
443 /* record header: msg_type ... */
444 *(d++) = SSL3_MT_CLIENT_HELLO;
445 /* ... and length (actual value will be written later) */
450 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
453 /* lets populate the random area */
454 /* get the challenge_length */
455 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
456 memset(d,0,SSL3_RANDOM_SIZE);
457 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
460 /* no session-id reuse */
467 for (i=0; i<csl; i+=3)
469 if (p[i] != 0) continue;
480 i = (d-(unsigned char *)s->init_buf->data) - 4;
481 l2n3((long)i, d_len);
483 /* get the data reused from the init_buf */
484 s->s3->tmp.reuse_message=1;
485 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
486 s->s3->tmp.message_size=i;
489 /* imaginary new state (for program structure): */
490 /* s->state = SSL23_SR_CLNT_HELLO_C */
494 #ifdef OPENSSL_NO_SSL2
495 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
498 /* we are talking sslv2 */
499 /* we need to clean up the SSLv3/TLSv1 setup and put in the
510 if (s->s3 != NULL) ssl3_free(s);
512 if (!BUF_MEM_grow(s->init_buf,
513 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
518 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
519 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
521 (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3))
522 s->s2->ssl2_rollback=0;
524 /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
525 * (SSL 3.0 draft/RFC 2246, App. E.2) */
526 s->s2->ssl2_rollback=1;
528 /* setup the n bytes we have read so we get them from
529 * the sslv2 buffer */
530 s->rstate=SSL_ST_READ_HEADER;
532 s->packet= &(s->s2->rbuf[0]);
533 memcpy(s->packet,buf,n);
537 s->method=SSLv2_server_method();
538 s->handshake_func=s->method->ssl_accept;
542 if ((type == 2) || (type == 3))
544 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
546 if (!ssl_init_wbio_buffer(s,1)) goto err;
548 /* we are in this state */
549 s->state=SSL3_ST_SR_CLNT_HELLO_A;
553 /* put the 'n' bytes we have read into the input buffer
555 s->rstate=SSL_ST_READ_HEADER;
557 s->packet= &(s->s3->rbuf.buf[0]);
558 memcpy(s->packet,buf,n);
560 s->s3->rbuf.offset=0;
566 s->s3->rbuf.offset=0;
569 if (s->version == TLS1_VERSION)
570 s->method = TLSv1_server_method();
572 s->method = SSLv3_server_method();
573 #if 0 /* ssl3_get_client_hello does this */
574 s->client_version=(v[0]<<8)|v[1];
576 s->handshake_func=s->method->ssl_accept;
579 if ((type < 1) || (type > 3))
582 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
587 if (buf != buf_space) OPENSSL_free(buf);
589 return(SSL_accept(s));
591 if (buf != buf_space) OPENSSL_free(buf);