21531d5dbe57ca698723d2fd12a5848dd1b5b0f8
[openssl.git] / ssl / s3_both.c
1 /* ssl/s3_both.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  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
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
71  *    distribution.
72  *
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/)"
77  *
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.
82  *
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.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
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  * ====================================================================
105  *
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).
109  *
110  */
111
112 #include <string.h>
113 #include <stdio.h>
114 #include <openssl/buffer.h>
115 #include <openssl/rand.h>
116 #include <openssl/objects.h>
117 #include <openssl/evp.h>
118 #include <openssl/x509.h>
119 #include "ssl_locl.h"
120
121 /* send s->init_buf in records of type 'type' */
122 int ssl3_do_write(SSL *s, int type)
123         {
124         int ret;
125
126         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
127                              s->init_num);
128         if (ret < 0) return(-1);
129         if (type == SSL3_RT_HANDSHAKE)
130                 /* should not be done for 'Hello Request's, but in that case
131                  * we'll ignore the result anyway */
132                 ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
133         
134         if (ret == s->init_num)
135                 return(1);
136         s->init_off+=ret;
137         s->init_num-=ret;
138         return(0);
139         }
140
141 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
142         {
143         unsigned char *p,*d;
144         int i;
145         unsigned long l;
146
147         if (s->state == a)
148                 {
149                 d=(unsigned char *)s->init_buf->data;
150                 p= &(d[4]);
151
152                 i=s->method->ssl3_enc->final_finish_mac(s,
153                         &(s->s3->finish_dgst1),
154                         &(s->s3->finish_dgst2),
155                         sender,slen,s->s3->tmp.finish_md);
156                 s->s3->tmp.finish_md_len = i;
157                 memcpy(p, s->s3->tmp.finish_md, i);
158                 p+=i;
159                 l=i;
160
161 #ifdef OPENSSL_SYS_WIN16
162                 /* MSVC 1.5 does not clear the top bytes of the word unless
163                  * I do this.
164                  */
165                 l&=0xffff;
166 #endif
167
168                 *(d++)=SSL3_MT_FINISHED;
169                 l2n3(l,d);
170                 s->init_num=(int)l+4;
171                 s->init_off=0;
172
173                 s->state=b;
174                 }
175
176         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
177         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
178         }
179
180 int ssl3_get_finished(SSL *s, int a, int b)
181         {
182         int al,i,ok;
183         long n;
184         unsigned char *p;
185
186         /* the mac has already been generated when we received the
187          * change cipher spec message and is in s->s3->tmp.peer_finish_md
188          */ 
189
190         n=ssl3_get_message(s,
191                 a,
192                 b,
193                 SSL3_MT_FINISHED,
194                 64, /* should actually be 36+4 :-) */
195                 &ok);
196
197         if (!ok) return((int)n);
198
199         /* If this occurs, we have missed a message */
200         if (!s->s3->change_cipher_spec)
201                 {
202                 al=SSL_AD_UNEXPECTED_MESSAGE;
203                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
204                 goto f_err;
205                 }
206         s->s3->change_cipher_spec=0;
207
208         p = (unsigned char *)s->init_buf->data;
209         i = s->s3->tmp.peer_finish_md_len;
210
211         if (i != n)
212                 {
213                 al=SSL_AD_DECODE_ERROR;
214                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
215                 goto f_err;
216                 }
217
218         if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
219                 {
220                 al=SSL_AD_DECRYPT_ERROR;
221                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
222                 goto f_err;
223                 }
224
225         return(1);
226 f_err:
227         ssl3_send_alert(s,SSL3_AL_FATAL,al);
228         return(0);
229         }
230
231 /* for these 2 messages, we need to
232  * ssl->enc_read_ctx                    re-init
233  * ssl->s3->read_sequence               zero
234  * ssl->s3->read_mac_secret             re-init
235  * ssl->session->read_sym_enc           assign
236  * ssl->session->read_compression       assign
237  * ssl->session->read_hash              assign
238  */
239 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
240         { 
241         unsigned char *p;
242
243         if (s->state == a)
244                 {
245                 p=(unsigned char *)s->init_buf->data;
246                 *p=SSL3_MT_CCS;
247                 s->init_num=1;
248                 s->init_off=0;
249
250                 s->state=b;
251                 }
252
253         /* SSL3_ST_CW_CHANGE_B */
254         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
255         }
256
257 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
258         {
259         unsigned char *p;
260         int n,i;
261         unsigned long l=7;
262         BUF_MEM *buf;
263         X509_STORE_CTX xs_ctx;
264         X509_OBJECT obj;
265
266         /* TLSv1 sends a chain with nothing in it, instead of an alert */
267         buf=s->init_buf;
268         if (!BUF_MEM_grow(buf,(int)(10)))
269                 {
270                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
271                 return(0);
272                 }
273         if (x != NULL)
274                 {
275                 if(!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL))
276                         {
277                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
278                         return(0);
279                         }
280
281                 for (;;)
282                         {
283                         n=i2d_X509(x,NULL);
284                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
285                                 {
286                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
287                                 return(0);
288                                 }
289                         p=(unsigned char *)&(buf->data[l]);
290                         l2n3(n,p);
291                         i2d_X509(x,&p);
292                         l+=n+3;
293                         if (X509_NAME_cmp(X509_get_subject_name(x),
294                                 X509_get_issuer_name(x)) == 0) break;
295
296                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
297                                 X509_get_issuer_name(x),&obj);
298                         if (i <= 0) break;
299                         x=obj.data.x509;
300                         /* Count is one too high since the X509_STORE_get uped the
301                          * ref count */
302                         X509_free(x);
303                         }
304
305                 X509_STORE_CTX_cleanup(&xs_ctx);
306                 }
307
308         /* Thawte special :-) */
309         if (s->ctx->extra_certs != NULL)
310         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
311                 {
312                 x=sk_X509_value(s->ctx->extra_certs,i);
313                 n=i2d_X509(x,NULL);
314                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
315                         {
316                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
317                         return(0);
318                         }
319                 p=(unsigned char *)&(buf->data[l]);
320                 l2n3(n,p);
321                 i2d_X509(x,&p);
322                 l+=n+3;
323                 }
324
325         l-=7;
326         p=(unsigned char *)&(buf->data[4]);
327         l2n3(l,p);
328         l+=3;
329         p=(unsigned char *)&(buf->data[0]);
330         *(p++)=SSL3_MT_CERTIFICATE;
331         l2n3(l,p);
332         l+=4;
333         return(l);
334         }
335
336 /* Obtain handshake message of message type 'mt' (any if mt == -1),
337  * maximum acceptable body length 'max'.
338  * The first four bytes (msg_type and length) are read in state 'st1',
339  * the body is read in state 'stn'.
340  */
341 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
342         {
343         unsigned char *p;
344         unsigned long l;
345         long n;
346         int i,al;
347
348         if (s->s3->tmp.reuse_message)
349                 {
350                 s->s3->tmp.reuse_message=0;
351                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
352                         {
353                         al=SSL_AD_UNEXPECTED_MESSAGE;
354                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
355                         goto f_err;
356                         }
357                 *ok=1;
358                 return((int)s->s3->tmp.message_size);
359                 }
360
361         p=(unsigned char *)s->init_buf->data;
362
363         if (s->state == st1) /* s->init_num < 4 */
364                 {
365                 int skip_message;
366
367                 do
368                         {
369                         while (s->init_num < 4)
370                                 {
371                                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
372                                         4 - s->init_num, 0);
373                                 if (i <= 0)
374                                         {
375                                         s->rwstate=SSL_READING;
376                                         *ok = 0;
377                                         return i;
378                                         }
379                                 s->init_num+=i;
380                                 }
381                         
382                         skip_message = 0;
383                         if (!s->server)
384                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
385                                         /* The server may always send 'Hello Request' messages --
386                                          * we are doing a handshake anyway now, so ignore them
387                                          * if their format is correct. Does not count for
388                                          * 'Finished' MAC. */
389                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
390                                                 {
391                                                 s->init_num = 0;
392                                                 skip_message = 1;
393                                                 }
394                         
395                         }
396                 while (skip_message);
397
398                 /* s->init_num == 4 */
399
400                 if ((mt >= 0) && (*p != mt))
401                         {
402                         al=SSL_AD_UNEXPECTED_MESSAGE;
403                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
404                         goto f_err;
405                         }
406                 if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
407                                         (st1 == SSL3_ST_SR_CERT_A) &&
408                                         (stn == SSL3_ST_SR_CERT_B))
409                         {
410                         /* At this point we have got an MS SGC second client
411                          * hello (maybe we should always allow the client to
412                          * start a new handshake?). We need to restart the mac.
413                          * Don't increment {num,total}_renegotiations because
414                          * we have not completed the handshake. */
415                         ssl3_init_finished_mac(s);
416                         }
417
418                 ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, 4);
419                         
420                 s->s3->tmp.message_type= *(p++);
421
422                 n2l3(p,l);
423                 if (l > (unsigned long)max)
424                         {
425                         al=SSL_AD_ILLEGAL_PARAMETER;
426                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
427                         goto f_err;
428                         }
429                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
430                         {
431                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
432                         goto err;
433                         }
434                 s->s3->tmp.message_size=l;
435                 s->state=stn;
436
437                 s->init_num=0;
438                 }
439
440         /* next state (stn) */
441         p=(unsigned char *)s->init_buf->data;
442         n=s->s3->tmp.message_size;
443         while (n > 0)
444                 {
445                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
446                 if (i <= 0)
447                         {
448                         s->rwstate=SSL_READING;
449                         *ok = 0;
450                         return i;
451                         }
452                 s->init_num += i;
453                 n -= i;
454                 }
455         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num);
456         *ok=1;
457         return s->init_num;
458 f_err:
459         ssl3_send_alert(s,SSL3_AL_FATAL,al);
460 err:
461         *ok=0;
462         return(-1);
463         }
464
465 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
466         {
467         EVP_PKEY *pk;
468         int ret= -1,i,j;
469
470         if (pkey == NULL)
471                 pk=X509_get_pubkey(x);
472         else
473                 pk=pkey;
474         if (pk == NULL) goto err;
475
476         i=pk->type;
477         if (i == EVP_PKEY_RSA)
478                 {
479                 ret=SSL_PKEY_RSA_ENC;
480                 if (x != NULL)
481                         {
482                         j=X509_get_ext_count(x);
483                         /* check to see if this is a signing only certificate */
484                         /* EAY EAY EAY EAY */
485                         }
486                 }
487         else if (i == EVP_PKEY_DSA)
488                 {
489                 ret=SSL_PKEY_DSA_SIGN;
490                 }
491         else if (i == EVP_PKEY_DH)
492                 {
493                 /* if we just have a key, we needs to be guess */
494
495                 if (x == NULL)
496                         ret=SSL_PKEY_DH_DSA;
497                 else
498                         {
499                         j=X509_get_signature_type(x);
500                         if (j == EVP_PKEY_RSA)
501                                 ret=SSL_PKEY_DH_RSA;
502                         else if (j== EVP_PKEY_DSA)
503                                 ret=SSL_PKEY_DH_DSA;
504                         else ret= -1;
505                         }
506                 }
507         else
508                 ret= -1;
509
510 err:
511         if(!pkey) EVP_PKEY_free(pk);
512         return(ret);
513         }
514
515 int ssl_verify_alarm_type(long type)
516         {
517         int al;
518
519         switch(type)
520                 {
521         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
522         case X509_V_ERR_UNABLE_TO_GET_CRL:
523         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
524                 al=SSL_AD_UNKNOWN_CA;
525                 break;
526         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
527         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
528         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
529         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
530         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
531         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
532         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
533         case X509_V_ERR_CERT_NOT_YET_VALID:
534         case X509_V_ERR_CRL_NOT_YET_VALID:
535                 al=SSL_AD_BAD_CERTIFICATE;
536                 break;
537         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
538         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
539                 al=SSL_AD_DECRYPT_ERROR;
540                 break;
541         case X509_V_ERR_CERT_HAS_EXPIRED:
542         case X509_V_ERR_CRL_HAS_EXPIRED:
543                 al=SSL_AD_CERTIFICATE_EXPIRED;
544                 break;
545         case X509_V_ERR_CERT_REVOKED:
546                 al=SSL_AD_CERTIFICATE_REVOKED;
547                 break;
548         case X509_V_ERR_OUT_OF_MEM:
549                 al=SSL_AD_INTERNAL_ERROR;
550                 break;
551         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
552         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
553         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
554         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
555         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
556                 al=SSL_AD_UNKNOWN_CA;
557                 break;
558         case X509_V_ERR_APPLICATION_VERIFICATION:
559                 al=SSL_AD_HANDSHAKE_FAILURE;
560                 break;
561         default:
562                 al=SSL_AD_CERTIFICATE_UNKNOWN;
563                 break;
564                 }
565         return(al);
566         }
567
568 int ssl3_setup_buffers(SSL *s)
569         {
570         unsigned char *p;
571         unsigned int extra;
572
573         if (s->s3->rbuf.buf == NULL)
574                 {
575                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
576                         extra=SSL3_RT_MAX_EXTRA;
577                 else
578                         extra=0;
579                 if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
580                         == NULL)
581                         goto err;
582                 s->s3->rbuf.buf=p;
583                 }
584
585         if (s->s3->wbuf.buf == NULL)
586                 {
587                 if ((p=OPENSSL_malloc(SSL3_RT_MAX_PACKET_SIZE))
588                         == NULL)
589                         goto err;
590                 s->s3->wbuf.buf=p;
591                 }
592         s->packet= &(s->s3->rbuf.buf[0]);
593         return(1);
594 err:
595         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
596         return(0);
597         }