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) 1998-2006 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 #include <openssl/fips.h>
122 static const SSL_METHOD *ssl23_get_server_method(int ver);
123 int ssl23_get_client_hello(SSL *s);
124 static const SSL_METHOD *ssl23_get_server_method(int ver)
126 #ifndef OPENSSL_NO_SSL2
127 if (ver == SSL2_VERSION)
128 return(SSLv2_server_method());
130 #ifndef OPENSSL_NO_SSL3
131 if (ver == SSL3_VERSION)
132 return(SSLv3_server_method());
134 if (ver == TLS1_VERSION)
135 return(TLSv1_server_method());
136 else if (ver == TLS1_1_VERSION)
137 return(TLSv1_1_server_method());
138 else if (ver == TLS1_2_VERSION)
139 return(TLSv1_2_server_method());
144 IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
146 ssl_undefined_function,
147 ssl23_get_server_method)
149 int ssl23_accept(SSL *s)
152 unsigned long Time=(unsigned long)time(NULL);
153 void (*cb)(const SSL *ssl,int type,int val)=NULL;
157 RAND_add(&Time,sizeof(Time),0);
161 if (s->info_callback != NULL)
163 else if (s->ctx->info_callback != NULL)
164 cb=s->ctx->info_callback;
167 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
177 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
178 case SSL_ST_OK|SSL_ST_ACCEPT:
181 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
183 /* s->version=SSL3_VERSION; */
184 s->type=SSL_ST_ACCEPT;
186 if (s->init_buf == NULL)
188 if ((buf=BUF_MEM_new()) == NULL)
193 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
202 ssl3_init_finished_mac(s);
204 s->state=SSL23_ST_SR_CLNT_HELLO_A;
205 s->ctx->stats.sess_accept++;
209 case SSL23_ST_SR_CLNT_HELLO_A:
210 case SSL23_ST_SR_CLNT_HELLO_B:
213 ret=ssl23_get_client_hello(s);
214 if (ret >= 0) cb=NULL;
219 SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
225 if ((cb != NULL) && (s->state != state))
229 cb(s,SSL_CB_ACCEPT_LOOP,1);
236 cb(s,SSL_CB_ACCEPT_EXIT,ret);
241 int ssl23_get_client_hello(SSL *s)
244 * Request this many bytes in initial read.
245 * We can detect SSL 3.0/TLS 1.0 Client Hellos
246 * ('type == 3') correctly only when the following
247 * is in a single record, which is not guaranteed by
248 * the protocol specification:
251 * 1/2 version > record header
254 * 6-8 length > Client Hello message
255 * 9/10 client_version /
258 char *buf= &(buf_space[0]);
259 unsigned char *p,*d,*d_len,*dd;
261 unsigned int csl,sil,cl;
266 if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
268 /* read the initial header */
271 if (!ssl3_setup_buffers(s)) goto err;
273 n=ssl23_read_bytes(s, sizeof buf_space);
274 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
280 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
285 if ((p[3] == 0x00) && (p[4] == 0x02))
287 v[0]=p[3]; v[1]=p[4];
289 if (!(s->options & SSL_OP_NO_SSLv2))
292 else if (p[3] == SSL3_VERSION_MAJOR)
294 v[0]=p[3]; v[1]=p[4];
296 if (p[4] >= TLS1_VERSION_MINOR)
298 if (p[4] >= TLS1_2_VERSION_MINOR &&
299 !(s->options & SSL_OP_NO_TLSv1_2))
301 s->version=TLS1_2_VERSION;
302 s->state=SSL23_ST_SR_CLNT_HELLO_B;
304 else if (p[4] >= TLS1_1_VERSION_MINOR &&
305 !(s->options & SSL_OP_NO_TLSv1_1))
307 s->version=TLS1_1_VERSION;
308 /* type=2; */ /* done later to survive restarts */
309 s->state=SSL23_ST_SR_CLNT_HELLO_B;
311 else if (!(s->options & SSL_OP_NO_TLSv1))
313 s->version=TLS1_VERSION;
314 /* type=2; */ /* done later to survive restarts */
315 s->state=SSL23_ST_SR_CLNT_HELLO_B;
317 else if (!(s->options & SSL_OP_NO_SSLv3))
319 s->version=SSL3_VERSION;
321 s->state=SSL23_ST_SR_CLNT_HELLO_B;
323 else if (!(s->options & SSL_OP_NO_SSLv2))
328 else if (!(s->options & SSL_OP_NO_SSLv3))
330 s->version=SSL3_VERSION;
332 s->state=SSL23_ST_SR_CLNT_HELLO_B;
334 else if (!(s->options & SSL_OP_NO_SSLv2))
339 /* p[4] < 5 ... silly record length? */
340 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
341 (p[1] == SSL3_VERSION_MAJOR) &&
342 (p[5] == SSL3_MT_CLIENT_HELLO) &&
343 ((p[3] == 0 && p[4] < 5)
347 * SSLv3 or tls1 header
350 v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */
351 /* We must look at client_version inside the Client Hello message
352 * to get the correct minor version.
353 * However if we have only a pathologically small fragment of the
354 * Client Hello message, this would be difficult, and we'd have
355 * to read more records to find out.
356 * No known SSL 3.0 client fragments ClientHello like this,
357 * so we simply reject such connections to avoid
358 * protocol version downgrade attacks. */
359 if (p[3] == 0 && p[4] < 6)
361 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL);
364 /* if major version number > 3 set minor to a value
365 * which will use the highest version 3 we support.
366 * If TLS 2.0 ever appears we will need to revise
369 if (p[9] > SSL3_VERSION_MAJOR)
372 v[1]=p[10]; /* minor version according to client_version */
373 if (v[1] >= TLS1_VERSION_MINOR)
375 if (v[1] >= TLS1_2_VERSION_MINOR &&
376 !(s->options & SSL_OP_NO_TLSv1_2))
378 s->version=TLS1_2_VERSION;
381 else if (v[1] >= TLS1_1_VERSION_MINOR &&
382 !(s->options & SSL_OP_NO_TLSv1_1))
384 s->version=TLS1_1_VERSION;
387 else if (!(s->options & SSL_OP_NO_TLSv1))
389 s->version=TLS1_VERSION;
392 else if (!(s->options & SSL_OP_NO_SSLv3))
394 s->version=SSL3_VERSION;
400 /* client requests SSL 3.0 */
401 if (!(s->options & SSL_OP_NO_SSLv3))
403 s->version=SSL3_VERSION;
406 else if (!(s->options & SSL_OP_NO_TLSv1))
408 /* we won't be able to use TLS of course,
409 * but this will send an appropriate alert */
410 s->version=TLS1_VERSION;
415 else if ((strncmp("GET ", (char *)p,4) == 0) ||
416 (strncmp("POST ",(char *)p,5) == 0) ||
417 (strncmp("HEAD ",(char *)p,5) == 0) ||
418 (strncmp("PUT ", (char *)p,4) == 0))
420 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
423 else if (strncmp("CONNECT",(char *)p,7) == 0)
425 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
430 /* ensure that TLS_MAX_VERSION is up-to-date */
431 OPENSSL_assert(s->version <= TLS_MAX_VERSION);
433 if (s->version < TLS1_2_VERSION && tls1_suiteb(s))
435 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
436 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
441 if (FIPS_mode() && (s->version < TLS1_VERSION))
443 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
444 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
449 if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
451 /* we have SSLv3/TLSv1 in an SSLv2 header
452 * (other cases skip this state) */
456 v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
460 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
461 * header is sent directly on the wire, not wrapped as a TLS
462 * record. It's format is:
467 * 5-6 cipher_spec_length
468 * 7-8 session_id_length
469 * 9-10 challenge_length
472 n=((p[0]&0x7f)<<8)|p[1];
475 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
480 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
484 j=ssl23_read_bytes(s,n+2);
485 /* We previously read 11 bytes, so if j > 0, we must have
486 * j == n+2 == s->packet_length. We have at least 11 valid
488 if (j <= 0) return(j);
490 ssl3_finish_mac(s, s->packet+2, s->packet_length-2);
494 s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg);
501 d=(unsigned char *)s->init_buf->data;
502 if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format
503 * Client Hello, can we? Error condition should be
506 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
510 /* record header: msg_type ... */
511 *(d++) = SSL3_MT_CLIENT_HELLO;
512 /* ... and length (actual value will be written later) */
517 *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
520 /* lets populate the random area */
521 /* get the challenge_length */
522 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
523 memset(d,0,SSL3_RANDOM_SIZE);
524 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
527 /* no session-id reuse */
534 for (i=0; i<csl; i+=3)
536 if (p[i] != 0) continue;
548 /* copy any remaining data with may be extensions */
550 while (p < s->packet+s->packet_length)
556 i = (d-(unsigned char *)s->init_buf->data) - 4;
557 l2n3((long)i, d_len);
559 /* get the data reused from the init_buf */
560 s->s3->tmp.reuse_message=1;
561 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
562 s->s3->tmp.message_size=i;
565 /* imaginary new state (for program structure): */
566 /* s->state = SSL23_SR_CLNT_HELLO_C */
570 #ifdef OPENSSL_NO_SSL2
571 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
574 /* we are talking sslv2 */
575 /* we need to clean up the SSLv3/TLSv1 setup and put in the
586 if (s->s3 != NULL) ssl3_free(s);
588 if (!BUF_MEM_grow_clean(s->init_buf,
589 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
594 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
595 if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3)
596 s->s2->ssl2_rollback=0;
598 /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0
599 * (SSL 3.0 draft/RFC 2246, App. E.2) */
600 s->s2->ssl2_rollback=1;
602 /* setup the n bytes we have read so we get them from
603 * the sslv2 buffer */
604 s->rstate=SSL_ST_READ_HEADER;
606 s->packet= &(s->s2->rbuf[0]);
607 memcpy(s->packet,buf,n);
611 s->method=SSLv2_server_method();
612 s->handshake_func=s->method->ssl_accept;
616 if ((type == 2) || (type == 3))
618 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
619 const SSL_METHOD *new_method;
620 new_method = ssl23_get_server_method(s->version);
621 if (new_method == NULL)
623 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
626 s->method = new_method;
628 if (!ssl_init_wbio_buffer(s,1)) goto err;
630 /* we are in this state */
631 s->state=SSL3_ST_SR_CLNT_HELLO_A;
635 /* put the 'n' bytes we have read into the input buffer
637 s->rstate=SSL_ST_READ_HEADER;
639 if (s->s3->rbuf.buf == NULL)
640 if (!ssl3_setup_read_buffer(s))
643 s->packet= &(s->s3->rbuf.buf[0]);
644 memcpy(s->packet,buf,n);
646 s->s3->rbuf.offset=0;
652 s->s3->rbuf.offset=0;
654 #if 0 /* ssl3_get_client_hello does this */
655 s->client_version=(v[0]<<8)|v[1];
657 s->handshake_func=s->method->ssl_accept;
660 if ((type < 1) || (type > 3))
663 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
668 if (buf != buf_space) OPENSSL_free(buf);
669 return(SSL_accept(s));
671 if (buf != buf_space) OPENSSL_free(buf);