Get rid of more non-ANSI declarations.
[openssl.git] / ssl / bio_ssl.c
1 /* ssl/bio_ssl.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 <stdlib.h>
61 #include <string.h>
62 #include <errno.h>
63 #include <openssl/crypto.h>
64 #include <openssl/bio.h>
65 #include <openssl/err.h>
66 #include <openssl/ssl.h>
67
68 static int ssl_write(BIO *h, const char *buf, int num);
69 static int ssl_read(BIO *h, char *buf, int size);
70 static int ssl_puts(BIO *h, const char *str);
71 static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);
72 static int ssl_new(BIO *h);
73 static int ssl_free(BIO *data);
74 static long ssl_callback_ctrl(BIO *h, int cmd, void (*fp)());
75 typedef struct bio_ssl_st
76         {
77         SSL *ssl; /* The ssl handle :-) */
78         /* re-negotiate every time the total number of bytes is this size */
79         int num_renegotiates;
80         unsigned long renegotiate_count;
81         unsigned long byte_count;
82         unsigned long renegotiate_timeout;
83         unsigned long last_time;
84         } BIO_SSL;
85
86 static BIO_METHOD methods_sslp=
87         {
88         BIO_TYPE_SSL,"ssl",
89         ssl_write,
90         ssl_read,
91         ssl_puts,
92         NULL, /* ssl_gets, */
93         ssl_ctrl,
94         ssl_new,
95         ssl_free,
96         ssl_callback_ctrl,
97         };
98
99 BIO_METHOD *BIO_f_ssl(void)
100         {
101         return(&methods_sslp);
102         }
103
104 static int ssl_new(BIO *bi)
105         {
106         BIO_SSL *bs;
107
108         bs=(BIO_SSL *)Malloc(sizeof(BIO_SSL));
109         if (bs == NULL)
110                 {
111                 BIOerr(BIO_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
112                 return(0);
113                 }
114         memset(bs,0,sizeof(BIO_SSL));
115         bi->init=0;
116         bi->ptr=(char *)bs;
117         bi->flags=0;
118         return(1);
119         }
120
121 static int ssl_free(BIO *a)
122         {
123         BIO_SSL *bs;
124
125         if (a == NULL) return(0);
126         bs=(BIO_SSL *)a->ptr;
127         if (bs->ssl != NULL) SSL_shutdown(bs->ssl);
128         if (a->shutdown)
129                 {
130                 if (a->init && (bs->ssl != NULL))
131                         SSL_free(bs->ssl);
132                 a->init=0;
133                 a->flags=0;
134                 }
135         if (a->ptr != NULL)
136                 Free(a->ptr);
137         return(1);
138         }
139         
140 static int ssl_read(BIO *b, char *out, int outl)
141         {
142         int ret=1;
143         BIO_SSL *sb;
144         SSL *ssl;
145         int retry_reason=0;
146         int r=0;
147
148         if (out == NULL) return(0);
149         sb=(BIO_SSL *)b->ptr;
150         ssl=sb->ssl;
151
152         BIO_clear_retry_flags(b);
153
154 #if 0
155         if (!SSL_is_init_finished(ssl))
156                 {
157 /*              ret=SSL_do_handshake(ssl); */
158                 if (ret > 0)
159                         {
160
161                         outflags=(BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
162                         ret= -1;
163                         goto end;
164                         }
165                 }
166 #endif
167 /*      if (ret > 0) */
168         ret=SSL_read(ssl,out,outl);
169
170         switch (SSL_get_error(ssl,ret))
171                 {
172         case SSL_ERROR_NONE:
173                 if (ret <= 0) break;
174                 if (sb->renegotiate_count > 0)
175                         {
176                         sb->byte_count+=ret;
177                         if (sb->byte_count > sb->renegotiate_count)
178                                 {
179                                 sb->byte_count=0;
180                                 sb->num_renegotiates++;
181                                 SSL_renegotiate(ssl);
182                                 r=1;
183                                 }
184                         }
185                 if ((sb->renegotiate_timeout > 0) && (!r))
186                         {
187                         unsigned long tm;
188
189                         tm=(unsigned long)time(NULL);
190                         if (tm > sb->last_time+sb->renegotiate_timeout)
191                                 {
192                                 sb->last_time=tm;
193                                 sb->num_renegotiates++;
194                                 SSL_renegotiate(ssl);
195                                 }
196                         }
197
198                 break;
199         case SSL_ERROR_WANT_READ:
200                 BIO_set_retry_read(b);
201                 break;
202         case SSL_ERROR_WANT_WRITE:
203                 BIO_set_retry_write(b);
204                 break;
205         case SSL_ERROR_WANT_X509_LOOKUP:
206                 BIO_set_retry_special(b);
207                 retry_reason=BIO_RR_SSL_X509_LOOKUP;
208                 break;
209         case SSL_ERROR_WANT_CONNECT:
210                 BIO_set_retry_special(b);
211                 retry_reason=BIO_RR_CONNECT;
212                 break;
213         case SSL_ERROR_SYSCALL:
214         case SSL_ERROR_SSL:
215         case SSL_ERROR_ZERO_RETURN:
216         default:
217                 break;
218                 }
219
220         b->retry_reason=retry_reason;
221         return(ret);
222         }
223
224 static int ssl_write(BIO *b, const char *out, int outl)
225         {
226         int ret,r=0;
227         int retry_reason=0;
228         SSL *ssl;
229         BIO_SSL *bs;
230
231         if (out == NULL) return(0);
232         bs=(BIO_SSL *)b->ptr;
233         ssl=bs->ssl;
234
235         BIO_clear_retry_flags(b);
236
237 /*      ret=SSL_do_handshake(ssl);
238         if (ret > 0) */
239         ret=SSL_write(ssl,out,outl);
240
241         switch (SSL_get_error(ssl,ret))
242                 {
243         case SSL_ERROR_NONE:
244                 if (ret <= 0) break;
245                 if (bs->renegotiate_count > 0)
246                         {
247                         bs->byte_count+=ret;
248                         if (bs->byte_count > bs->renegotiate_count)
249                                 {
250                                 bs->byte_count=0;
251                                 bs->num_renegotiates++;
252                                 SSL_renegotiate(ssl);
253                                 r=1;
254                                 }
255                         }
256                 if ((bs->renegotiate_timeout > 0) && (!r))
257                         {
258                         unsigned long tm;
259
260                         tm=(unsigned long)time(NULL);
261                         if (tm > bs->last_time+bs->renegotiate_timeout)
262                                 {
263                                 bs->last_time=tm;
264                                 bs->num_renegotiates++;
265                                 SSL_renegotiate(ssl);
266                                 }
267                         }
268                 break;
269         case SSL_ERROR_WANT_WRITE:
270                 BIO_set_retry_write(b);
271                 break;
272         case SSL_ERROR_WANT_READ:
273                 BIO_set_retry_read(b);
274                 break;
275         case SSL_ERROR_WANT_X509_LOOKUP:
276                 BIO_set_retry_special(b);
277                 retry_reason=BIO_RR_SSL_X509_LOOKUP;
278                 break;
279         case SSL_ERROR_WANT_CONNECT:
280                 BIO_set_retry_special(b);
281                 retry_reason=BIO_RR_CONNECT;
282         case SSL_ERROR_SYSCALL:
283         case SSL_ERROR_SSL:
284         default:
285                 break;
286                 }
287
288         b->retry_reason=retry_reason;
289         return(ret);
290         }
291
292 static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
293         {
294         SSL **sslp,*ssl;
295         BIO_SSL *bs;
296         BIO *dbio,*bio;
297         long ret=1;
298
299         bs=(BIO_SSL *)b->ptr;
300         ssl=bs->ssl;
301         if ((ssl == NULL)  && (cmd != BIO_C_SET_SSL))
302                 return(0);
303         switch (cmd)
304                 {
305         case BIO_CTRL_RESET:
306                 SSL_shutdown(ssl);
307
308                 if (ssl->handshake_func == ssl->method->ssl_connect)
309                         SSL_set_connect_state(ssl);
310                 else if (ssl->handshake_func == ssl->method->ssl_accept)
311                         SSL_set_accept_state(ssl);
312
313                 SSL_clear(ssl);
314
315                 if (b->next_bio != NULL)
316                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
317                 else if (ssl->rbio != NULL)
318                         ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
319                 else
320                         ret=1;
321                 break;
322         case BIO_CTRL_INFO:
323                 ret=0;
324                 break;
325         case BIO_C_SSL_MODE:
326                 if (num) /* client mode */
327                         SSL_set_connect_state(ssl);
328                 else
329                         SSL_set_accept_state(ssl);
330                 break;
331         case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
332                 ret=bs->renegotiate_timeout;
333                 if (num < 60) num=5;
334                 bs->renegotiate_timeout=(unsigned long)num;
335                 bs->last_time=(unsigned long)time(NULL);
336                 break;
337         case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
338                 ret=bs->renegotiate_count;
339                 if ((long)num >=512)
340                         bs->renegotiate_count=(unsigned long)num;
341                 break;
342         case BIO_C_GET_SSL_NUM_RENEGOTIATES:
343                 ret=bs->num_renegotiates;
344                 break;
345         case BIO_C_SET_SSL:
346                 if (ssl != NULL)
347                         ssl_free(b);
348                 b->shutdown=(int)num;
349                 ssl=(SSL *)ptr;
350                 ((BIO_SSL *)b->ptr)->ssl=ssl;
351                 bio=SSL_get_rbio(ssl);
352                 if (bio != NULL)
353                         {
354                         if (b->next_bio != NULL)
355                                 BIO_push(bio,b->next_bio);
356                         b->next_bio=bio;
357                         CRYPTO_add(&bio->references,1,CRYPTO_LOCK_BIO);
358                         }
359                 b->init=1;
360                 break;
361         case BIO_C_GET_SSL:
362                 if (ptr != NULL)
363                         {
364                         sslp=(SSL **)ptr;
365                         *sslp=ssl;
366                         }
367                 else
368                         ret=0;
369                 break;
370         case BIO_CTRL_GET_CLOSE:
371                 ret=b->shutdown;
372                 break;
373         case BIO_CTRL_SET_CLOSE:
374                 b->shutdown=(int)num;
375                 break;
376         case BIO_CTRL_WPENDING:
377                 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
378                 break;
379         case BIO_CTRL_PENDING:
380                 ret=SSL_pending(ssl);
381                 if (ret == 0)
382                         ret=BIO_pending(ssl->rbio);
383                 break;
384         case BIO_CTRL_FLUSH:
385                 BIO_clear_retry_flags(b);
386                 ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
387                 BIO_copy_next_retry(b);
388                 break;
389         case BIO_CTRL_PUSH:
390                 if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio))
391                         {
392                         SSL_set_bio(ssl,b->next_bio,b->next_bio);
393                         CRYPTO_add(&b->next_bio->references,1,CRYPTO_LOCK_BIO);
394                         }
395                 break;
396         case BIO_CTRL_POP:
397                 /* ugly bit of a hack */
398                 if (ssl->rbio != ssl->wbio) /* we are in trouble :-( */
399                         {
400                         BIO_free_all(ssl->wbio);
401                         }
402                 ssl->wbio=NULL;
403                 ssl->rbio=NULL;
404                 break;
405         case BIO_C_DO_STATE_MACHINE:
406                 BIO_clear_retry_flags(b);
407
408                 b->retry_reason=0;
409                 ret=(int)SSL_do_handshake(ssl);
410
411                 switch (SSL_get_error(ssl,(int)ret))
412                         {
413                 case SSL_ERROR_WANT_READ:
414                         BIO_set_flags(b,
415                                 BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
416                         break;
417                 case SSL_ERROR_WANT_WRITE:
418                         BIO_set_flags(b,
419                                 BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);
420                         break;
421                 case SSL_ERROR_WANT_CONNECT:
422                         BIO_set_flags(b,
423                                 BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
424                         b->retry_reason=b->next_bio->retry_reason;
425                         break;
426                 default:
427                         break;
428                         }
429                 break;
430         case BIO_CTRL_DUP:
431                 dbio=(BIO *)ptr;
432                 if (((BIO_SSL *)dbio->ptr)->ssl != NULL)
433                         SSL_free(((BIO_SSL *)dbio->ptr)->ssl);
434                 ((BIO_SSL *)dbio->ptr)->ssl=SSL_dup(ssl);
435                 ((BIO_SSL *)dbio->ptr)->renegotiate_count=
436                         ((BIO_SSL *)b->ptr)->renegotiate_count;
437                 ((BIO_SSL *)dbio->ptr)->byte_count=
438                         ((BIO_SSL *)b->ptr)->byte_count;
439                 ((BIO_SSL *)dbio->ptr)->renegotiate_timeout=
440                         ((BIO_SSL *)b->ptr)->renegotiate_timeout;
441                 ((BIO_SSL *)dbio->ptr)->last_time=
442                         ((BIO_SSL *)b->ptr)->last_time;
443                 ret=(((BIO_SSL *)dbio->ptr)->ssl != NULL);
444                 break;
445         case BIO_C_GET_FD:
446                 ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
447                 break;
448         case BIO_CTRL_SET_CALLBACK:
449                 {
450 #if 0 /* FIXME: Should this be used?  -- Richard Levitte */
451                 BIOerr(SSL_F_SSL_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
452                 ret = -1;
453 #else
454                 ret=0;
455 #endif
456                 }
457                 break;
458         case BIO_CTRL_GET_CALLBACK:
459                 {
460                 void (**fptr)();
461
462                 fptr=(void (**)())ptr;
463                 *fptr=SSL_get_info_callback(ssl);
464                 }
465                 break;
466         default:
467                 ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
468                 break;
469                 }
470         return(ret);
471         }
472
473 static long ssl_callback_ctrl(BIO *b, int cmd, void (*fp)())
474         {
475         SSL *ssl;
476         BIO_SSL *bs;
477         long ret=1;
478
479         bs=(BIO_SSL *)b->ptr;
480         ssl=bs->ssl;
481         switch (cmd)
482                 {
483         case BIO_CTRL_SET_CALLBACK:
484                 {
485                 SSL_set_info_callback(ssl,fp);
486                 }
487                 break;
488         default:
489                 ret=BIO_callback_ctrl(ssl->rbio,cmd,fp);
490                 break;
491                 }
492         return(ret);
493         }
494
495 static int ssl_puts(BIO *bp, const char *str)
496         {
497         int n,ret;
498
499         n=strlen(str);
500         ret=BIO_write(bp,str,n);
501         return(ret);
502         }
503
504 BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
505         {
506         BIO *ret=NULL,*buf=NULL,*ssl=NULL;
507
508         if ((buf=BIO_new(BIO_f_buffer())) == NULL)
509                 return(NULL);
510         if ((ssl=BIO_new_ssl_connect(ctx)) == NULL)
511                 goto err;
512         if ((ret=BIO_push(buf,ssl)) == NULL)
513                 goto err;
514         return(ret);
515 err:
516         if (buf != NULL) BIO_free(buf);
517         if (ssl != NULL) BIO_free(ssl);
518         return(NULL);
519         }
520
521 BIO *BIO_new_ssl_connect(SSL_CTX *ctx)
522         {
523         BIO *ret=NULL,*con=NULL,*ssl=NULL;
524
525         if ((con=BIO_new(BIO_s_connect())) == NULL)
526                 return(NULL);
527         if ((ssl=BIO_new_ssl(ctx,1)) == NULL)
528                 goto err;
529         if ((ret=BIO_push(ssl,con)) == NULL)
530                 goto err;
531         return(ret);
532 err:
533         if (con != NULL) BIO_free(con);
534         if (ret != NULL) BIO_free(ret);
535         return(NULL);
536         }
537
538 BIO *BIO_new_ssl(SSL_CTX *ctx, int client)
539         {
540         BIO *ret;
541         SSL *ssl;
542
543         if ((ret=BIO_new(BIO_f_ssl())) == NULL)
544                 return(NULL);
545         if ((ssl=SSL_new(ctx)) == NULL)
546                 {
547                 BIO_free(ret);
548                 return(NULL);
549                 }
550         if (client)
551                 SSL_set_connect_state(ssl);
552         else
553                 SSL_set_accept_state(ssl);
554                 
555         BIO_set_ssl(ret,ssl,BIO_CLOSE);
556         return(ret);
557         }
558
559 int BIO_ssl_copy_session_id(BIO *t, BIO *f)
560         {
561         t=BIO_find_type(t,BIO_TYPE_SSL);
562         f=BIO_find_type(f,BIO_TYPE_SSL);
563         if ((t == NULL) || (f == NULL))
564                 return(0);
565         if (    (((BIO_SSL *)t->ptr)->ssl == NULL) || 
566                 (((BIO_SSL *)f->ptr)->ssl == NULL))
567                 return(0);
568         SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl,((BIO_SSL *)f->ptr)->ssl);
569         return(1);
570         }
571
572 void BIO_ssl_shutdown(BIO *b)
573         {
574         SSL *s;
575
576         while (b != NULL)
577                 {
578                 if (b->method->type == BIO_TYPE_SSL)
579                         {
580                         s=((BIO_SSL *)b->ptr)->ssl;
581                         SSL_shutdown(s);
582                         break;
583                         }
584                 b=b->next_bio;
585                 }
586         }