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.]
60 #include <openssl/buffer.h>
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/evp.h>
66 static SSL_METHOD *ssl23_get_server_method(int ver);
67 int ssl23_get_client_hello(SSL *s);
68 static SSL_METHOD *ssl23_get_server_method(int ver)
70 if (ver == SSL2_VERSION)
71 return(SSLv2_server_method());
72 if (ver == SSL3_VERSION)
73 return(SSLv3_server_method());
74 else if (ver == TLS1_VERSION)
75 return(TLSv1_server_method());
80 SSL_METHOD *SSLv23_server_method(void)
83 static SSL_METHOD SSLv23_server_data;
87 memcpy((char *)&SSLv23_server_data,
88 (char *)sslv23_base_method(),sizeof(SSL_METHOD));
89 SSLv23_server_data.ssl_accept=ssl23_accept;
90 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
93 return(&SSLv23_server_data);
96 int ssl23_accept(SSL *s)
99 unsigned long Time=time(NULL);
104 RAND_seed(&Time,sizeof(Time));
108 if (s->info_callback != NULL)
110 else if (s->ctx->info_callback != NULL)
111 cb=s->ctx->info_callback;
113 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
124 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
125 case SSL_ST_OK|SSL_ST_ACCEPT:
128 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
130 /* s->version=SSL3_VERSION; */
131 s->type=SSL_ST_ACCEPT;
133 if (s->init_buf == NULL)
135 if ((buf=BUF_MEM_new()) == NULL)
140 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
148 ssl3_init_finished_mac(s);
150 s->state=SSL23_ST_SR_CLNT_HELLO_A;
151 s->ctx->stats.sess_accept++;
155 case SSL23_ST_SR_CLNT_HELLO_A:
156 case SSL23_ST_SR_CLNT_HELLO_B:
159 ret=ssl23_get_client_hello(s);
160 if (ret >= 0) cb=NULL;
165 SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
171 if ((cb != NULL) && (s->state != state))
175 cb(s,SSL_CB_ACCEPT_LOOP,1);
181 cb(s,SSL_CB_ACCEPT_EXIT,ret);
187 int ssl23_get_client_hello(SSL *s)
189 char buf_space[11]; /* request this many bytes in initial read */
190 char *buf= &(buf_space[0]);
191 unsigned char *p,*d,*dd;
193 unsigned int csl,sil,cl;
195 int type=0,use_sslv2_strong=0;
198 if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
200 /* read the initial header */
203 if (!ssl3_setup_buffers(s)) goto err;
205 n=ssl23_read_bytes(s, sizeof buf_space);
206 if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */
212 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
217 if ((p[3] == 0x00) && (p[4] == 0x02))
219 v[0]=p[3]; v[1]=p[4];
221 if (!(s->options & SSL_OP_NO_SSLv2))
224 else if (p[3] == SSL3_VERSION_MAJOR)
226 v[0]=p[3]; v[1]=p[4];
228 if (p[4] >= TLS1_VERSION_MINOR)
230 if (!(s->options & SSL_OP_NO_TLSv1))
233 /* type=2; */ /* done later to survive restarts */
234 s->state=SSL23_ST_SR_CLNT_HELLO_B;
236 else if (!(s->options & SSL_OP_NO_SSLv3))
239 s->state=SSL23_ST_SR_CLNT_HELLO_B;
241 else if (!(s->options & SSL_OP_NO_SSLv2))
246 else if (!(s->options & SSL_OP_NO_SSLv3))
249 s->state=SSL23_ST_SR_CLNT_HELLO_B;
251 else if (!(s->options & SSL_OP_NO_SSLv2))
254 if (s->options & SSL_OP_NON_EXPORT_FIRST)
255 /* Not only utterly confusing, but broken
256 * ('fractured programming'?) -- the details
257 * of this block nearly make it work
258 * as intended in this environment, but on one
259 * of the fine points (w.r.t. restarts) it fails.
260 * The obvious fix would be even more devastating
261 * to program structure; if you want the functionality,
262 * throw this away and implement it in a way
263 * that makes sense */
265 STACK_OF(SSL_CIPHER) *sk;
269 j=((p[0]&0x7f)<<8)|p[1];
272 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
276 n=ssl23_read_bytes(s,j+2);
277 if (n <= 0) return(n);
280 if ((buf=Malloc(n)) == NULL)
282 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
291 sk=ssl_bytes_to_cipher_list(
296 for (j=0; j<sk_SSL_CIPHER_num(sk); j++)
298 c=sk_SSL_CIPHER_value(sk,j);
299 if (!SSL_C_IS_EXPORT(c))
301 if ((c->id>>24L) == 2L)
317 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
318 (p[1] == SSL3_VERSION_MAJOR) &&
319 (p[5] == SSL3_MT_CLIENT_HELLO) &&
323 * SSLv3 or tls1 header
326 /* we must look at client_version inside the client hello: */
327 v[0]=p[9]; v[1]=p[10];
328 if (v[1] >= TLS1_VERSION_MINOR)
330 if (!(s->options & SSL_OP_NO_TLSv1))
335 else if (!(s->options & SSL_OP_NO_SSLv3))
338 else if (!(s->options & SSL_OP_NO_SSLv3))
341 else if ((strncmp("GET ", (char *)p,4) == 0) ||
342 (strncmp("POST ",(char *)p,5) == 0) ||
343 (strncmp("HEAD ",(char *)p,5) == 0) ||
344 (strncmp("PUT ", (char *)p,4) == 0))
346 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
349 else if (strncmp("CONNECT",(char *)p,7) == 0)
351 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
357 if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
359 /* we have a SSLv3/TLSv1 in a SSLv2 header
360 * (other cases skip this state)* */
365 n=((p[0]&0x7f)<<8)|p[1];
368 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
372 j=ssl23_read_bytes(s,n+2);
373 if (j <= 0) return(j);
375 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
382 d=(unsigned char *)s->init_buf->data;
383 if ((csl+sil+cl+11) != s->packet_length)
385 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
389 *(d++)=SSL3_VERSION_MAJOR;
391 *(d++)=TLS1_VERSION_MINOR;
393 *(d++)=SSL3_VERSION_MINOR;
395 /* lets populate the random area */
396 /* get the chalenge_length */
397 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
398 memset(d,0,SSL3_RANDOM_SIZE);
399 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
402 /* no session-id reuse */
409 for (i=0; i<csl; i+=3)
411 if (p[i] != 0) continue;
422 i=(d-(unsigned char *)s->init_buf->data);
424 /* get the data reused from the init_buf */
425 s->s3->tmp.reuse_message=1;
426 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
427 s->s3->tmp.message_size=i;
430 /* imaginary new state (for program structure): */
431 /* s->state = SSL23_SR_CLNT_HELLO_C */
435 /* we are talking sslv2 */
436 /* we need to clean up the SSLv3/TLSv1 setup and put in the
447 if (s->s3 != NULL) ssl3_free(s);
449 if (!BUF_MEM_grow(s->init_buf,
450 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
455 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
456 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
458 s->s2->ssl2_rollback=0;
460 s->s2->ssl2_rollback=1;
462 /* setup the n bytes we have read so we get them from
463 * the sslv2 buffer */
464 s->rstate=SSL_ST_READ_HEADER;
466 s->packet= &(s->s2->rbuf[0]);
467 memcpy(s->packet,buf,n);
471 s->method=SSLv2_server_method();
472 s->handshake_func=s->method->ssl_accept;
475 if ((type == 2) || (type == 3))
477 /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */
479 if (!ssl_init_wbio_buffer(s,1)) goto err;
481 /* we are in this state */
482 s->state=SSL3_ST_SR_CLNT_HELLO_A;
486 /* put the 'n' bytes we have read into the input buffer
488 s->rstate=SSL_ST_READ_HEADER;
490 s->packet= &(s->s3->rbuf.buf[0]);
491 memcpy(s->packet,buf,n);
493 s->s3->rbuf.offset=0;
499 s->s3->rbuf.offset=0;
504 s->version=TLS1_VERSION;
505 s->method=TLSv1_server_method();
509 s->version=SSL3_VERSION;
510 s->method=SSLv3_server_method();
512 #if 0 /* ssl3_get_client_hello does this */
513 s->client_version=(v[0]<<8)|v[1];
515 s->handshake_func=s->method->ssl_accept;
518 if ((type < 1) || (type > 3))
521 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
526 if (buf != buf_space) Free(buf);
528 return(SSL_accept(s));
530 if (buf != buf_space) Free(buf);