398f0058217b70d1cf0105f9f3784a34ea2d96da
[openssl.git] / ssl / s23_srvr.c
1 /* ssl/s23_srvr.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
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.
8  * 
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).
15  * 
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.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
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)"
40  * 
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
51  * SUCH DAMAGE.
52  * 
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.]
57  */
58
59 #include <stdio.h>
60 #include "buffer.h"
61 #include "rand.h"
62 #include "objects.h"
63 #include "evp.h"
64 #include "ssl_locl.h"
65
66 #define BREAK break
67
68 #ifndef NOPROTO
69 int ssl23_get_client_hello(SSL *s);
70 #else
71 int ssl23_get_client_hello();
72 #endif
73
74 static SSL_METHOD *ssl23_get_server_method(ver)
75 int ver;
76         {
77         if (ver == 2)
78                 return(SSLv2_server_method());
79         else if (ver == 3)
80                 return(SSLv3_server_method());
81         else
82                 return(NULL);
83         }
84
85 SSL_METHOD *SSLv23_server_method()
86         {
87         static int init=1;
88         static SSL_METHOD SSLv23_server_data;
89
90         if (init)
91                 {
92                 init=0;
93                 memcpy((char *)&SSLv23_server_data,
94                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
95                 SSLv23_server_data.ssl_accept=ssl23_accept;
96                 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
97                 }
98         return(&SSLv23_server_data);
99         }
100
101 int ssl23_accept(s)
102 SSL *s;
103         {
104         BUF_MEM *buf;
105         unsigned long Time=time(NULL);
106         void (*cb)()=NULL;
107         int ret= -1;
108         int new_state,state;
109
110         RAND_seed((unsigned char *)&Time,sizeof(Time));
111         ERR_clear_error();
112         errno=0;
113
114         if (s->info_callback != NULL)
115                 cb=s->info_callback;
116         else if (s->ctx->info_callback != NULL)
117                 cb=s->ctx->info_callback;
118         
119         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
120         s->in_handshake++;
121
122         for (;;)
123                 {
124                 state=s->state;
125
126                 switch(s->state)
127                         {
128                 case SSL_ST_BEFORE:
129                 case SSL_ST_ACCEPT:
130                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
131                 case SSL_ST_OK|SSL_ST_ACCEPT:
132
133                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
134
135                         s->version=3;
136                         s->type=SSL_ST_ACCEPT;
137
138                         if (s->init_buf == NULL)
139                                 {
140                                 if ((buf=BUF_MEM_new()) == NULL)
141                                         {
142                                         ret= -1;
143                                         goto end;
144                                         }
145                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
146                                         {
147                                         ret= -1;
148                                         goto end;
149                                         }
150                                 s->init_buf=buf;
151                                 }
152
153                         ssl3_init_finished_mac(s);
154
155                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
156                         s->ctx->sess_accept++;
157                         s->init_num=0;
158                         break;
159
160                 case SSL23_ST_SR_CLNT_HELLO_A:
161                 case SSL23_ST_SR_CLNT_HELLO_B:
162
163                         s->shutdown=0;
164                         ret=ssl23_get_client_hello(s);
165                         if (ret >= 0) cb=NULL;
166                         goto end;
167                         break;
168
169                 default:
170                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
171                         ret= -1;
172                         goto end;
173                         /* break; */
174                         }
175
176                 if ((cb != NULL) && (s->state != state))
177                         {
178                         new_state=s->state;
179                         s->state=state;
180                         cb(s,SSL_CB_ACCEPT_LOOP,1);
181                         s->state=new_state;
182                         }
183                 }
184 end:
185         if (cb != NULL)
186                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
187         s->in_handshake--;
188         return(ret);
189         }
190
191
192 int ssl23_get_client_hello(s)
193 SSL *s;
194         {
195         char buf_space[8];
196         char *buf= &(buf_space[0]);
197         unsigned char *p,*d,*dd;
198         unsigned int i;
199         unsigned int csl,sil,cl;
200         int n=0,j;
201         BIO *bbio;
202         int type=0,use_sslv2_strong=0;
203
204         /* read the initial header */
205         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
206                 {
207                 if (!ssl3_setup_buffers(s)) goto err;
208
209                 n=ssl23_read_bytes(s,7);
210                 if (n != 7) return(n);
211
212                 p=s->packet;
213
214                 memcpy(buf,p,n);
215
216                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
217                         {
218                         /* SSLv2 header */
219                         if ((p[3] == 0x00) && (p[4] == 0x02))
220                                 {
221                                 /* SSLv2 */
222                                 type=1;
223                                 }
224                         else if (p[3] == SSL3_VERSION_MAJOR)
225                                 {
226                                 if (s->ctx->options & SSL_OP_NON_EXPORT_FIRST)
227                                         {
228                                         STACK *sk;
229                                         SSL_CIPHER *c;
230                                         int ne2,ne3;
231
232                                         j=((p[0]&0x7f)<<8)|p[1];
233                                         if (j > (1024*4))
234                                                 {
235                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
236                                                 goto err;
237                                                 }
238
239                                         n=ssl23_read_bytes(s,j+2);
240                                         if (n <= 0) return(n);
241                                         p=s->packet;
242
243                                         if ((buf=Malloc(n)) == NULL)
244                                                 {
245                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
246                                                 goto err;
247                                                 }
248                                         memcpy(buf,p,n);
249
250                                         p+=5;
251                                         n2s(p,csl);
252                                         p+=4;
253
254                                         sk=ssl_bytes_to_cipher_list(
255                                                 s,p,csl,NULL);
256                                         if (sk != NULL)
257                                                 {
258                                                 ne2=ne3=0;
259                                                 for (j=0; j<sk_num(sk); j++)
260                                                         {
261                                                         c=(SSL_CIPHER *)sk_value(sk,j);
262                                                         if (!(c->algorithms & SSL_EXP))
263                                                                 {
264                                                                 if ((c->id>>24L) == 2L)
265                                                                         ne2=1;
266                                                                 else
267                                                                         ne3=1;
268                                                                 }
269                                                         }
270                                                 if (ne2 && !ne3)
271                                                         {
272                                                         type=1;
273                                                         use_sslv2_strong=1;
274                                                         goto next_bit;
275                                                         }
276                                                 }
277                                         }
278                                 /* SSLv3 */
279                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
280                                 }
281                         }
282                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
283                          (p[1] == SSL3_VERSION_MAJOR) &&
284                          (p[5] == SSL3_MT_CLIENT_HELLO))
285                         {
286                         /* true SSLv3 */
287                         type=3;
288                         }
289                 /* I will not introduce error codes since that will probably
290                  * disrupt the error codes alread allocated and could play
291                  * havoc with dynamic allocation.  Upgrade to 0.9.x :-)
292                  */
293                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
294                          (strncmp("POST ",(char *)p,5) == 0) ||
295                          (strncmp("HEAD ",(char *)p,5) == 0) ||
296                          (strncmp("PUT ", (char *)p,4) == 0))
297                         {
298                         goto err;
299                         }
300                 else if (strncmp("CONNECT",(char *)p,7) == 0)
301                         {
302                         goto err;
303                         }
304                 }
305
306 next_bit:
307         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
308                 {
309                 /* we have a SSLv3 in a SSLv2 header */
310                 type=2;
311                 p=s->packet;
312                 n=((p[0]&0x7f)<<8)|p[1];
313                 if (n > (1024*4))
314                         {
315                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
316                         goto err;
317                         }
318
319                 j=ssl23_read_bytes(s,n+2);
320                 if (j <= 0) return(j);
321
322                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
323
324                 p=s->packet;
325                 p+=5;
326                 n2s(p,csl);
327                 n2s(p,sil);
328                 n2s(p,cl);
329                 d=(unsigned char *)s->init_buf->data;
330                 if ((csl+sil+cl+11) != s->packet_length)
331                         {
332                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
333                         goto err;
334                         }
335
336                 *(d++)=SSL3_VERSION_MAJOR;
337                 *(d++)=SSL3_VERSION_MINOR;
338
339                 /* lets populate the random area */
340                 /* get the chalenge_length */
341                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
342                 memset(d,0,SSL3_RANDOM_SIZE);
343                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
344                 d+=SSL3_RANDOM_SIZE;
345
346                 /* no session-id reuse */
347                 *(d++)=0;
348
349                 /* ciphers */
350                 j=0;
351                 dd=d;
352                 d+=2;
353                 for (i=0; i<csl; i+=3)
354                         {
355                         if (p[i] != 0) continue;
356                         *(d++)=p[i+1];
357                         *(d++)=p[i+2];
358                         j+=2;
359                         }
360                 s2n(j,dd);
361
362                 /* compression */
363                 *(d++)=1;
364                 *(d++)=0;
365                 
366                 i=(d-(unsigned char *)s->init_buf->data);
367
368                 /* get the data reused from the init_buf */
369                 s->s3->tmp.reuse_message=1;
370                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
371                 s->s3->tmp.message_size=i;
372                 }
373
374         if (type == 1)
375                 {
376                 /* we are talking sslv2 */
377                 /* we need to clean up the SSLv3 setup and put in the
378                  * sslv2 stuff. */
379
380                 if (s->s2 == NULL)
381                         {
382                         if (!ssl2_new(s))
383                                 goto err;
384                         }
385                 else
386                         ssl2_clear(s);
387
388                 if (s->s3 != NULL) ssl3_free(s);
389
390                 if (!BUF_MEM_grow(s->init_buf,
391                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
392                         {
393                         goto err;
394                         }
395
396                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
397                 if ((s->ctx->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
398                         use_sslv2_strong)
399                         s->s2->ssl2_rollback=0;
400                 else
401                         s->s2->ssl2_rollback=1;
402
403                 /* setup the 5 bytes we have read so we get them from
404                  * the sslv2 buffer */
405                 s->rstate=SSL_ST_READ_HEADER;
406                 s->packet_length=n;
407                 s->packet= &(s->s2->rbuf[0]);
408                 memcpy(s->packet,buf,n);
409                 s->s2->rbuf_left=n;
410                 s->s2->rbuf_offs=0;
411
412                 s->method=SSLv2_server_method();
413                 s->handshake_func=s->method->ssl_accept;
414                 }
415
416         if ((type == 2) || (type == 3))
417                 {
418                 /* we have sslv3 */
419
420                 if (s->bbio == NULL)
421                         {
422                         bbio=BIO_new(BIO_f_buffer());
423                         if (bbio == NULL)
424                                 goto err;
425                         s->bbio=bbio;
426                         }
427                 else
428                         bbio=s->bbio;
429                 BIO_reset(bbio);
430                 if (!BIO_set_write_buffer_size(bbio,16*1024))
431                         goto err;
432                 s->wbio=BIO_push(bbio,s->wbio);
433
434                 /* we are in this state */
435                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
436
437                 if (type == 3)
438                         {
439                         /* put the 'n' bytes we have read into the input buffer
440                          * for SSLv3 */
441                         s->rstate=SSL_ST_READ_HEADER;
442                         s->packet_length=n;
443                         s->packet= &(s->s3->rbuf.buf[0]);
444                         memcpy(s->packet,buf,n);
445                         s->s3->rbuf.left=n;
446                         s->s3->rbuf.offset=0;
447                         }
448                 else
449                         {
450                         s->packet_length=0;
451                         s->s3->rbuf.left=0;
452                         s->s3->rbuf.offset=0;
453                         }
454
455                 s->method=SSLv3_server_method();
456                 s->handshake_func=s->method->ssl_accept;
457                 }
458         
459         if ((type < 1) || (type > 3))
460                 {
461                 /* bad, very bad */
462                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
463                 goto err;
464                 }
465         s->init_num=0;
466
467         if (buf != buf_space) Free(buf);
468         s->first_packet=1;
469         return(SSL_accept(s));
470 err:
471         if (buf != buf_space) Free(buf);
472         return(-1);
473         }
474