Yet more pissing about to get PEM built at the right moment.
[openssl.git] / ssl / s23_srvr.c
1 /* ssl/s23_srvr.c */
2 /* Copyright (C) 1995-1998 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 == SSL2_VERSION)
78                 return(SSLv2_server_method());
79         else if (ver == SSL3_VERSION)
80                 return(SSLv3_server_method());
81         else if (ver == TLS1_VERSION)
82                 return(TLSv1_server_method());
83         else
84                 return(NULL);
85         }
86
87 SSL_METHOD *SSLv23_server_method()
88         {
89         static int init=1;
90         static SSL_METHOD SSLv23_server_data;
91
92         if (init)
93                 {
94                 init=0;
95                 memcpy((char *)&SSLv23_server_data,
96                         (char *)sslv23_base_method(),sizeof(SSL_METHOD));
97                 SSLv23_server_data.ssl_accept=ssl23_accept;
98                 SSLv23_server_data.get_ssl_method=ssl23_get_server_method;
99                 }
100         return(&SSLv23_server_data);
101         }
102
103 int ssl23_accept(s)
104 SSL *s;
105         {
106         BUF_MEM *buf;
107         unsigned long Time=time(NULL);
108         void (*cb)()=NULL;
109         int ret= -1;
110         int new_state,state;
111
112         RAND_seed((unsigned char *)&Time,sizeof(Time));
113         ERR_clear_error();
114         clear_sys_error();
115
116         if (s->info_callback != NULL)
117                 cb=s->info_callback;
118         else if (s->ctx->info_callback != NULL)
119                 cb=s->ctx->info_callback;
120         
121         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
122         s->in_handshake++;
123
124         for (;;)
125                 {
126                 state=s->state;
127
128                 switch(s->state)
129                         {
130                 case SSL_ST_BEFORE:
131                 case SSL_ST_ACCEPT:
132                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
133                 case SSL_ST_OK|SSL_ST_ACCEPT:
134
135                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
136
137                         /* s->version=SSL3_VERSION; */
138                         s->type=SSL_ST_ACCEPT;
139
140                         if (s->init_buf == NULL)
141                                 {
142                                 if ((buf=BUF_MEM_new()) == NULL)
143                                         {
144                                         ret= -1;
145                                         goto end;
146                                         }
147                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
148                                         {
149                                         ret= -1;
150                                         goto end;
151                                         }
152                                 s->init_buf=buf;
153                                 }
154
155                         ssl3_init_finished_mac(s);
156
157                         s->state=SSL23_ST_SR_CLNT_HELLO_A;
158                         s->ctx->sess_accept++;
159                         s->init_num=0;
160                         break;
161
162                 case SSL23_ST_SR_CLNT_HELLO_A:
163                 case SSL23_ST_SR_CLNT_HELLO_B:
164
165                         s->shutdown=0;
166                         ret=ssl23_get_client_hello(s);
167                         if (ret >= 0) cb=NULL;
168                         goto end;
169                         /* break; */
170
171                 default:
172                         SSLerr(SSL_F_SSL23_ACCEPT,SSL_R_UNKNOWN_STATE);
173                         ret= -1;
174                         goto end;
175                         /* break; */
176                         }
177
178                 if ((cb != NULL) && (s->state != state))
179                         {
180                         new_state=s->state;
181                         s->state=state;
182                         cb(s,SSL_CB_ACCEPT_LOOP,1);
183                         s->state=new_state;
184                         }
185                 }
186 end:
187         if (cb != NULL)
188                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
189         s->in_handshake--;
190         return(ret);
191         }
192
193
194 int ssl23_get_client_hello(s)
195 SSL *s;
196         {
197         char buf_space[8];
198         char *buf= &(buf_space[0]);
199         unsigned char *p,*d,*dd;
200         unsigned int i;
201         unsigned int csl,sil,cl;
202         int n=0,j,tls1=0;
203         int type=0,use_sslv2_strong=0;
204
205         /* read the initial header */
206         if (s->state == SSL23_ST_SR_CLNT_HELLO_A)
207                 {
208                 if (!ssl3_setup_buffers(s)) goto err;
209
210                 n=ssl23_read_bytes(s,7);
211                 if (n != 7) return(n);
212
213                 p=s->packet;
214
215                 memcpy(buf,p,n);
216
217                 if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO))
218                         {
219                         /* SSLv2 header */
220                         if ((p[3] == 0x00) && (p[4] == 0x02))
221                                 {
222                                 /* SSLv2 */
223                                 if (!(s->options & SSL_OP_NO_SSLv2))
224                                         type=1;
225                                 }
226                         else if (p[3] == SSL3_VERSION_MAJOR)
227                                 {
228                                 /* SSLv3/TLSv1 */
229                                 if (p[4] >= TLS1_VERSION_MINOR)
230                                         {
231                                         if (!(s->options & SSL_OP_NO_TLSv1))
232                                                 {
233                                                 tls1=1;
234                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
235                                                 }
236                                         else if (!(s->options & SSL_OP_NO_SSLv3))
237                                                 {
238                                                 s->state=SSL23_ST_SR_CLNT_HELLO_B;
239                                                 }
240                                         else if (!(s->options & SSL_OP_NO_SSLv2))
241                                                 {
242                                                 type=1;
243                                                 }
244                                         }
245                                 else if (!(s->options & SSL_OP_NO_SSLv3))
246                                         s->state=SSL23_ST_SR_CLNT_HELLO_B;
247                                 else if (!(s->options & SSL_OP_NO_SSLv2))
248                                         type=1;
249
250                                 if (s->options & SSL_OP_NON_EXPORT_FIRST)
251                                         {
252                                         STACK *sk;
253                                         SSL_CIPHER *c;
254                                         int ne2,ne3;
255
256                                         j=((p[0]&0x7f)<<8)|p[1];
257                                         if (j > (1024*4))
258                                                 {
259                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
260                                                 goto err;
261                                                 }
262
263                                         n=ssl23_read_bytes(s,j+2);
264                                         if (n <= 0) return(n);
265                                         p=s->packet;
266
267                                         if ((buf=Malloc(n)) == NULL)
268                                                 {
269                                                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
270                                                 goto err;
271                                                 }
272                                         memcpy(buf,p,n);
273
274                                         p+=5;
275                                         n2s(p,csl);
276                                         p+=4;
277
278                                         sk=ssl_bytes_to_cipher_list(
279                                                 s,p,csl,NULL);
280                                         if (sk != NULL)
281                                                 {
282                                                 ne2=ne3=0;
283                                                 for (j=0; j<sk_num(sk); j++)
284                                                         {
285                                                         c=(SSL_CIPHER *)sk_value(sk,j);
286                                                         if (!(c->algorithms & SSL_EXP))
287                                                                 {
288                                                                 if ((c->id>>24L) == 2L)
289                                                                         ne2=1;
290                                                                 else
291                                                                         ne3=1;
292                                                                 }
293                                                         }
294                                                 if (ne2 && !ne3)
295                                                         {
296                                                         type=1;
297                                                         use_sslv2_strong=1;
298                                                         goto next_bit;
299                                                         }
300                                                 }
301                                         }
302                                 }
303                         }
304                 else if ((p[0] == SSL3_RT_HANDSHAKE) &&
305                          (p[1] == SSL3_VERSION_MAJOR) &&
306                          (p[5] == SSL3_MT_CLIENT_HELLO))
307                         {
308                         /* true SSLv3 or tls1 */
309                         if (p[2] >= TLS1_VERSION_MINOR)
310                                 {
311                                 if (!(s->options & SSL_OP_NO_TLSv1))
312                                         {
313                                         type=3;
314                                         tls1=1;
315                                         }
316                                 else if (!(s->options & SSL_OP_NO_SSLv3))
317                                         type=3;
318                                 }
319                         else if (!(s->options & SSL_OP_NO_SSLv3))
320                                 type=3;
321                         }
322                 else if ((strncmp("GET ", (char *)p,4) == 0) ||
323                          (strncmp("POST ",(char *)p,5) == 0) ||
324                          (strncmp("HEAD ",(char *)p,5) == 0) ||
325                          (strncmp("PUT ", (char *)p,4) == 0))
326                         {
327                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST);
328                         goto err;
329                         }
330                 else if (strncmp("CONNECT",(char *)p,7) == 0)
331                         {
332                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST);
333                         goto err;
334                         }
335                 }
336
337 next_bit:
338         if (s->state == SSL23_ST_SR_CLNT_HELLO_B)
339                 {
340                 /* we have a SSLv3/TLSv1 in a SSLv2 header */
341                 type=2;
342                 p=s->packet;
343                 n=((p[0]&0x7f)<<8)|p[1];
344                 if (n > (1024*4))
345                         {
346                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE);
347                         goto err;
348                         }
349
350                 j=ssl23_read_bytes(s,n+2);
351                 if (j <= 0) return(j);
352
353                 ssl3_finish_mac(s,&(s->packet[2]),s->packet_length-2);
354
355                 p=s->packet;
356                 p+=5;
357                 n2s(p,csl);
358                 n2s(p,sil);
359                 n2s(p,cl);
360                 d=(unsigned char *)s->init_buf->data;
361                 if ((csl+sil+cl+11) != s->packet_length)
362                         {
363                         SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH);
364                         goto err;
365                         }
366
367                 *(d++)=SSL3_VERSION_MAJOR;
368                 if (tls1)
369                         *(d++)=TLS1_VERSION_MINOR;
370                 else
371                         *(d++)=SSL3_VERSION_MINOR;
372
373                 /* lets populate the random area */
374                 /* get the chalenge_length */
375                 i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl;
376                 memset(d,0,SSL3_RANDOM_SIZE);
377                 memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i);
378                 d+=SSL3_RANDOM_SIZE;
379
380                 /* no session-id reuse */
381                 *(d++)=0;
382
383                 /* ciphers */
384                 j=0;
385                 dd=d;
386                 d+=2;
387                 for (i=0; i<csl; i+=3)
388                         {
389                         if (p[i] != 0) continue;
390                         *(d++)=p[i+1];
391                         *(d++)=p[i+2];
392                         j+=2;
393                         }
394                 s2n(j,dd);
395
396                 /* COMPRESSION */
397                 *(d++)=1;
398                 *(d++)=0;
399                 
400                 i=(d-(unsigned char *)s->init_buf->data);
401
402                 /* get the data reused from the init_buf */
403                 s->s3->tmp.reuse_message=1;
404                 s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO;
405                 s->s3->tmp.message_size=i;
406                 }
407
408         if (type == 1)
409                 {
410                 /* we are talking sslv2 */
411                 /* we need to clean up the SSLv3/TLSv1 setup and put in the
412                  * sslv2 stuff. */
413
414                 if (s->s2 == NULL)
415                         {
416                         if (!ssl2_new(s))
417                                 goto err;
418                         }
419                 else
420                         ssl2_clear(s);
421
422                 if (s->s3 != NULL) ssl3_free(s);
423
424                 if (!BUF_MEM_grow(s->init_buf,
425                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
426                         {
427                         goto err;
428                         }
429
430                 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
431                 if ((s->options & SSL_OP_MSIE_SSLV2_RSA_PADDING) ||
432                         use_sslv2_strong)
433                         s->s2->ssl2_rollback=0;
434                 else
435                         s->s2->ssl2_rollback=1;
436
437                 /* setup the 5 bytes we have read so we get them from
438                  * the sslv2 buffer */
439                 s->rstate=SSL_ST_READ_HEADER;
440                 s->packet_length=n;
441                 s->packet= &(s->s2->rbuf[0]);
442                 memcpy(s->packet,buf,n);
443                 s->s2->rbuf_left=n;
444                 s->s2->rbuf_offs=0;
445
446                 s->method=SSLv2_server_method();
447                 s->handshake_func=s->method->ssl_accept;
448                 }
449
450         if ((type == 2) || (type == 3))
451                 {
452                 /* we have SSLv3/TLSv1 */
453
454                 if (!ssl_init_wbio_buffer(s,1)) goto err;
455
456                 /* we are in this state */
457                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
458
459                 if (type == 3)
460                         {
461                         /* put the 'n' bytes we have read into the input buffer
462                          * for SSLv3 */
463                         s->rstate=SSL_ST_READ_HEADER;
464                         s->packet_length=n;
465                         s->packet= &(s->s3->rbuf.buf[0]);
466                         memcpy(s->packet,buf,n);
467                         s->s3->rbuf.left=n;
468                         s->s3->rbuf.offset=0;
469                         }
470                 else
471                         {
472                         s->packet_length=0;
473                         s->s3->rbuf.left=0;
474                         s->s3->rbuf.offset=0;
475                         }
476
477                 if (tls1)
478                         {
479                         s->version=TLS1_VERSION;
480                         s->method=TLSv1_server_method();
481                         }
482                 else
483                         {
484                         s->version=SSL3_VERSION;
485                         s->method=SSLv3_server_method();
486                         }
487                 s->handshake_func=s->method->ssl_accept;
488                 }
489         
490         if ((type < 1) || (type > 3))
491                 {
492                 /* bad, very bad */
493                 SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL);
494                 goto err;
495                 }
496         s->init_num=0;
497
498         if (buf != buf_space) Free(buf);
499         s->first_packet=1;
500         return(SSL_accept(s));
501 err:
502         if (buf != buf_space) Free(buf);
503         return(-1);
504         }
505