6236b74572714c9d581c4dc812f59859e64ca8ff
[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 #include <string.h>
60 #include <stdio.h>
61 #include <openssl/buffer.h>
62 #include <openssl/rand.h>
63 #include <openssl/objects.h>
64 #include <openssl/evp.h>
65 #include <openssl/x509.h>
66 #include "ssl_locl.h"
67
68 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
69         {
70         unsigned char *p,*d;
71         int i;
72         unsigned long l;
73
74         if (s->state == a)
75                 {
76                 d=(unsigned char *)s->init_buf->data;
77                 p= &(d[4]);
78
79                 i=s->method->ssl3_enc->final_finish_mac(s,
80                         &(s->s3->finish_dgst1),
81                         &(s->s3->finish_dgst2),
82                         sender,slen,s->s3->tmp.finish_md);
83                 s->s3->tmp.finish_md_len = i;
84                 memcpy(p, s->s3->tmp.finish_md, i);
85                 p+=i;
86                 l=i;
87
88 #ifdef WIN16
89                 /* MSVC 1.5 does not clear the top bytes of the word unless
90                  * I do this.
91                  */
92                 l&=0xffff;
93 #endif
94
95                 *(d++)=SSL3_MT_FINISHED;
96                 l2n3(l,d);
97                 s->init_num=(int)l+4;
98                 s->init_off=0;
99
100                 s->state=b;
101                 }
102
103         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
104         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
105         }
106
107 int ssl3_get_finished(SSL *s, int a, int b)
108         {
109         int al,i,ok;
110         long n;
111         unsigned char *p;
112
113         /* the mac has already been generated when we received the
114          * change cipher spec message and is in s->s3->tmp.peer_finish_md
115          */ 
116
117         n=ssl3_get_message(s,
118                 a,
119                 b,
120                 SSL3_MT_FINISHED,
121                 64, /* should actually be 36+4 :-) */
122                 &ok);
123
124         if (!ok) return((int)n);
125
126         /* If this occurs, we have missed a message */
127         if (!s->s3->change_cipher_spec)
128                 {
129                 al=SSL_AD_UNEXPECTED_MESSAGE;
130                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
131                 goto f_err;
132                 }
133         s->s3->change_cipher_spec=0;
134
135         p = (unsigned char *)s->init_buf->data;
136         i = s->s3->tmp.peer_finish_md_len;
137
138         if (i != n)
139                 {
140                 al=SSL_AD_DECODE_ERROR;
141                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
142                 goto f_err;
143                 }
144
145         if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
146                 {
147                 al=SSL_AD_DECRYPT_ERROR;
148                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
149                 goto f_err;
150                 }
151
152         return(1);
153 f_err:
154         ssl3_send_alert(s,SSL3_AL_FATAL,al);
155         return(0);
156         }
157
158 /* for these 2 messages, we need to
159  * ssl->enc_read_ctx                    re-init
160  * ssl->s3->read_sequence               zero
161  * ssl->s3->read_mac_secret             re-init
162  * ssl->session->read_sym_enc           assign
163  * ssl->session->read_compression       assign
164  * ssl->session->read_hash              assign
165  */
166 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
167         { 
168         unsigned char *p;
169
170         if (s->state == a)
171                 {
172                 p=(unsigned char *)s->init_buf->data;
173                 *p=SSL3_MT_CCS;
174                 s->init_num=1;
175                 s->init_off=0;
176
177                 s->state=b;
178                 }
179
180         /* SSL3_ST_CW_CHANGE_B */
181         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
182         }
183
184 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
185         {
186         unsigned char *p;
187         int n,i;
188         unsigned long l=7;
189         BUF_MEM *buf;
190         X509_STORE_CTX xs_ctx;
191         X509_OBJECT obj;
192
193         /* TLSv1 sends a chain with nothing in it, instead of an alert */
194         buf=s->init_buf;
195         if (!BUF_MEM_grow(buf,(int)(10)))
196                 {
197                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
198                 return(0);
199                 }
200         if (x != NULL)
201                 {
202                 X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,NULL,NULL);
203
204                 for (;;)
205                         {
206                         n=i2d_X509(x,NULL);
207                         if (!BUF_MEM_grow(buf,(int)(n+l+3)))
208                                 {
209                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
210                                 return(0);
211                                 }
212                         p=(unsigned char *)&(buf->data[l]);
213                         l2n3(n,p);
214                         i2d_X509(x,&p);
215                         l+=n+3;
216                         if (X509_NAME_cmp(X509_get_subject_name(x),
217                                 X509_get_issuer_name(x)) == 0) break;
218
219                         i=X509_STORE_get_by_subject(&xs_ctx,X509_LU_X509,
220                                 X509_get_issuer_name(x),&obj);
221                         if (i <= 0) break;
222                         x=obj.data.x509;
223                         /* Count is one too high since the X509_STORE_get uped the
224                          * ref count */
225                         X509_free(x);
226                         }
227
228                 X509_STORE_CTX_cleanup(&xs_ctx);
229                 }
230
231         /* Thawte special :-) */
232         if (s->ctx->extra_certs != NULL)
233         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
234                 {
235                 x=sk_X509_value(s->ctx->extra_certs,i);
236                 n=i2d_X509(x,NULL);
237                 if (!BUF_MEM_grow(buf,(int)(n+l+3)))
238                         {
239                         SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
240                         return(0);
241                         }
242                 p=(unsigned char *)&(buf->data[l]);
243                 l2n3(n,p);
244                 i2d_X509(x,&p);
245                 l+=n+3;
246                 }
247
248         l-=7;
249         p=(unsigned char *)&(buf->data[4]);
250         l2n3(l,p);
251         l+=3;
252         p=(unsigned char *)&(buf->data[0]);
253         *(p++)=SSL3_MT_CERTIFICATE;
254         l2n3(l,p);
255         l+=4;
256         return(l);
257         }
258
259 /* Obtain handshake message of message type 'mt' (any if mt == -1),
260  * maximum acceptable body length 'max'.
261  * The first four bytes (msg_type and length) are read in state 'st1',
262  * the body is read in state 'stn'.
263  */
264 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
265         {
266         unsigned char *p;
267         unsigned long l;
268         long n;
269         int i,al;
270
271         if (s->s3->tmp.reuse_message)
272                 {
273                 s->s3->tmp.reuse_message=0;
274                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
275                         {
276                         al=SSL_AD_UNEXPECTED_MESSAGE;
277                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
278                         goto f_err;
279                         }
280                 *ok=1;
281                 return((int)s->s3->tmp.message_size);
282                 }
283
284         p=(unsigned char *)s->init_buf->data;
285
286         if (s->state == st1) /* s->init_num < 4 */
287                 {
288                 while (s->init_num < 4)
289                         {
290                         i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],
291                                 4-s->init_num);
292                         if (i <= 0)
293                                 {
294                                 s->rwstate=SSL_READING;
295                                 *ok = 0;
296                                 return i;
297                                 }
298                         s->init_num+=i;
299                         }
300
301 /* XXX server may always send Hello Request */
302                 if ((mt >= 0) && (*p != mt))
303                         {
304                         al=SSL_AD_UNEXPECTED_MESSAGE;
305                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
306                         goto f_err;
307                         }
308                 if((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
309                                         (st1 == SSL3_ST_SR_CERT_A) &&
310                                         (stn == SSL3_ST_SR_CERT_B))
311                         {
312                         /* At this point we have got an MS SGC second client
313                          * hello. We need to restart the mac and mac the data
314                          * currently received.
315                          */
316                         ssl3_init_finished_mac(s);
317                         ssl3_finish_mac(s, p + s->init_num, i);
318                         }
319                         
320                 s->s3->tmp.message_type= *(p++);
321
322                 n2l3(p,l);
323                 if (l > (unsigned long)max)
324                         {
325                         al=SSL_AD_ILLEGAL_PARAMETER;
326                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
327                         goto f_err;
328                         }
329                 if (l && !BUF_MEM_grow(s->init_buf,(int)l))
330                         {
331                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
332                         goto err;
333                         }
334                 s->s3->tmp.message_size=l;
335                 s->state=stn;
336
337                 s->init_num=0;
338                 }
339
340         /* next state (stn) */
341         p=(unsigned char *)s->init_buf->data;
342         n=s->s3->tmp.message_size;
343         while (n > 0)
344                 {
345                 i=ssl3_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n);
346                 if (i <= 0)
347                         {
348                         s->rwstate=SSL_READING;
349                         *ok = 0;
350                         return i;
351                         }
352                 s->init_num += i;
353                 n -= i;
354                 }
355         *ok=1;
356         return s->init_num;
357 f_err:
358         ssl3_send_alert(s,SSL3_AL_FATAL,al);
359 err:
360         *ok=0;
361         return(-1);
362         }
363
364 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
365         {
366         EVP_PKEY *pk;
367         int ret= -1,i,j;
368
369         if (pkey == NULL)
370                 pk=X509_get_pubkey(x);
371         else
372                 pk=pkey;
373         if (pk == NULL) goto err;
374
375         i=pk->type;
376         if (i == EVP_PKEY_RSA)
377                 {
378                 ret=SSL_PKEY_RSA_ENC;
379                 if (x != NULL)
380                         {
381                         j=X509_get_ext_count(x);
382                         /* check to see if this is a signing only certificate */
383                         /* EAY EAY EAY EAY */
384                         }
385                 }
386         else if (i == EVP_PKEY_DSA)
387                 {
388                 ret=SSL_PKEY_DSA_SIGN;
389                 }
390         else if (i == EVP_PKEY_DH)
391                 {
392                 /* if we just have a key, we needs to be guess */
393
394                 if (x == NULL)
395                         ret=SSL_PKEY_DH_DSA;
396                 else
397                         {
398                         j=X509_get_signature_type(x);
399                         if (j == EVP_PKEY_RSA)
400                                 ret=SSL_PKEY_DH_RSA;
401                         else if (j== EVP_PKEY_DSA)
402                                 ret=SSL_PKEY_DH_DSA;
403                         else ret= -1;
404                         }
405                 }
406         else
407                 ret= -1;
408
409 err:
410         if(!pkey) EVP_PKEY_free(pk);
411         return(ret);
412         }
413
414 int ssl_verify_alarm_type(long type)
415         {
416         int al;
417
418         switch(type)
419                 {
420         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
421         case X509_V_ERR_UNABLE_TO_GET_CRL:
422                 al=SSL_AD_UNKNOWN_CA;
423                 break;
424         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
425         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
426         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
427         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
428         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
429         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
430         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
431         case X509_V_ERR_CERT_NOT_YET_VALID:
432         case X509_V_ERR_CRL_NOT_YET_VALID:
433                 al=SSL_AD_BAD_CERTIFICATE;
434                 break;
435         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
436         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
437                 al=SSL_AD_DECRYPT_ERROR;
438                 break;
439         case X509_V_ERR_CERT_HAS_EXPIRED:
440         case X509_V_ERR_CRL_HAS_EXPIRED:
441                 al=SSL_AD_CERTIFICATE_EXPIRED;
442                 break;
443         case X509_V_ERR_CERT_REVOKED:
444                 al=SSL_AD_CERTIFICATE_REVOKED;
445                 break;
446         case X509_V_ERR_OUT_OF_MEM:
447                 al=SSL_AD_INTERNAL_ERROR;
448                 break;
449         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
450         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
451         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
452         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
453         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
454                 al=SSL_AD_UNKNOWN_CA;
455                 break;
456         case X509_V_ERR_APPLICATION_VERIFICATION:
457                 al=SSL_AD_HANDSHAKE_FAILURE;
458                 break;
459         default:
460                 al=SSL_AD_CERTIFICATE_UNKNOWN;
461                 break;
462                 }
463         return(al);
464         }
465
466 int ssl3_setup_buffers(SSL *s)
467         {
468         unsigned char *p;
469         unsigned int extra;
470
471         if (s->s3->rbuf.buf == NULL)
472                 {
473                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
474                         extra=SSL3_RT_MAX_EXTRA;
475                 else
476                         extra=0;
477                 if ((p=Malloc(SSL3_RT_MAX_PACKET_SIZE+extra))
478                         == NULL)
479                         goto err;
480                 s->s3->rbuf.buf=p;
481                 }
482
483         if (s->s3->wbuf.buf == NULL)
484                 {
485                 if ((p=Malloc(SSL3_RT_MAX_PACKET_SIZE))
486                         == NULL)
487                         goto err;
488                 s->s3->wbuf.buf=p;
489                 }
490         s->packet= &(s->s3->rbuf.buf[0]);
491         return(1);
492 err:
493         SSLerr(SSL_F_SSL3_SETUP_BUFFERS,ERR_R_MALLOC_FAILURE);
494         return(0);
495         }