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-rw-r--r--src/lib/libssl/bio_ssl.c581
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diff --git a/src/lib/libssl/bio_ssl.c b/src/lib/libssl/bio_ssl.c
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1/* $OpenBSD: bio_ssl.c,v 1.21 2014/11/16 14:12:47 jsing Exp $ */
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 <errno.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63
64#include <openssl/bio.h>
65#include <openssl/crypto.h>
66#include <openssl/err.h>
67#include <openssl/ssl.h>
68
69static int ssl_write(BIO *h, const char *buf, int num);
70static int ssl_read(BIO *h, char *buf, int size);
71static int ssl_puts(BIO *h, const char *str);
72static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);
73static int ssl_new(BIO *h);
74static int ssl_free(BIO *data);
75static long ssl_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
76typedef struct bio_ssl_st {
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
86static BIO_METHOD methods_sslp = {
87 .type = BIO_TYPE_SSL,
88 .name = "ssl",
89 .bwrite = ssl_write,
90 .bread = ssl_read,
91 .bputs = ssl_puts,
92 .ctrl = ssl_ctrl,
93 .create = ssl_new,
94 .destroy = ssl_free,
95 .callback_ctrl = ssl_callback_ctrl,
96};
97
98BIO_METHOD *
99BIO_f_ssl(void)
100{
101 return (&methods_sslp);
102}
103
104static int
105ssl_new(BIO *bi)
106{
107 BIO_SSL *bs;
108
109 bs = calloc(1, sizeof(BIO_SSL));
110 if (bs == NULL) {
111 BIOerr(BIO_F_SSL_NEW, ERR_R_MALLOC_FAILURE);
112 return (0);
113 }
114 bi->init = 0;
115 bi->ptr = (char *)bs;
116 bi->flags = 0;
117 return (1);
118}
119
120static int
121ssl_free(BIO *a)
122{
123 BIO_SSL *bs;
124
125 if (a == NULL)
126 return (0);
127 bs = (BIO_SSL *)a->ptr;
128 if (bs->ssl != NULL)
129 SSL_shutdown(bs->ssl);
130 if (a->shutdown) {
131 if (a->init && (bs->ssl != NULL))
132 SSL_free(bs->ssl);
133 a->init = 0;
134 a->flags = 0;
135 }
136 free(a->ptr);
137 return (1);
138}
139
140static int
141ssl_read(BIO *b, char *out, int outl)
142{
143 int ret = 1;
144 BIO_SSL *sb;
145 SSL *ssl;
146 int retry_reason = 0;
147 int r = 0;
148
149 if (out == NULL)
150 return (0);
151 sb = (BIO_SSL *)b->ptr;
152 ssl = sb->ssl;
153
154 BIO_clear_retry_flags(b);
155
156 ret = SSL_read(ssl, out, outl);
157
158 switch (SSL_get_error(ssl, ret)) {
159 case SSL_ERROR_NONE:
160 if (ret <= 0)
161 break;
162 if (sb->renegotiate_count > 0) {
163 sb->byte_count += ret;
164 if (sb->byte_count > sb->renegotiate_count) {
165 sb->byte_count = 0;
166 sb->num_renegotiates++;
167 SSL_renegotiate(ssl);
168 r = 1;
169 }
170 }
171 if ((sb->renegotiate_timeout > 0) && (!r)) {
172 unsigned long tm;
173
174 tm = (unsigned long)time(NULL);
175 if (tm > sb->last_time + sb->renegotiate_timeout) {
176 sb->last_time = tm;
177 sb->num_renegotiates++;
178 SSL_renegotiate(ssl);
179 }
180 }
181
182 break;
183 case SSL_ERROR_WANT_READ:
184 BIO_set_retry_read(b);
185 break;
186 case SSL_ERROR_WANT_WRITE:
187 BIO_set_retry_write(b);
188 break;
189 case SSL_ERROR_WANT_X509_LOOKUP:
190 BIO_set_retry_special(b);
191 retry_reason = BIO_RR_SSL_X509_LOOKUP;
192 break;
193 case SSL_ERROR_WANT_ACCEPT:
194 BIO_set_retry_special(b);
195 retry_reason = BIO_RR_ACCEPT;
196 break;
197 case SSL_ERROR_WANT_CONNECT:
198 BIO_set_retry_special(b);
199 retry_reason = BIO_RR_CONNECT;
200 break;
201 case SSL_ERROR_SYSCALL:
202 case SSL_ERROR_SSL:
203 case SSL_ERROR_ZERO_RETURN:
204 default:
205 break;
206 }
207
208 b->retry_reason = retry_reason;
209 return (ret);
210}
211
212static int
213ssl_write(BIO *b, const char *out, int outl)
214{
215 int ret, r = 0;
216 int retry_reason = 0;
217 SSL *ssl;
218 BIO_SSL *bs;
219
220 if (out == NULL)
221 return (0);
222 bs = (BIO_SSL *)b->ptr;
223 ssl = bs->ssl;
224
225 BIO_clear_retry_flags(b);
226
227/* ret=SSL_do_handshake(ssl);
228 if (ret > 0) */
229 ret = SSL_write(ssl, out, outl);
230
231 switch (SSL_get_error(ssl, ret)) {
232 case SSL_ERROR_NONE:
233 if (ret <= 0)
234 break;
235 if (bs->renegotiate_count > 0) {
236 bs->byte_count += ret;
237 if (bs->byte_count > bs->renegotiate_count) {
238 bs->byte_count = 0;
239 bs->num_renegotiates++;
240 SSL_renegotiate(ssl);
241 r = 1;
242 }
243 }
244 if ((bs->renegotiate_timeout > 0) && (!r)) {
245 unsigned long tm;
246
247 tm = (unsigned long)time(NULL);
248 if (tm > bs->last_time + bs->renegotiate_timeout) {
249 bs->last_time = tm;
250 bs->num_renegotiates++;
251 SSL_renegotiate(ssl);
252 }
253 }
254 break;
255 case SSL_ERROR_WANT_WRITE:
256 BIO_set_retry_write(b);
257 break;
258 case SSL_ERROR_WANT_READ:
259 BIO_set_retry_read(b);
260 break;
261 case SSL_ERROR_WANT_X509_LOOKUP:
262 BIO_set_retry_special(b);
263 retry_reason = BIO_RR_SSL_X509_LOOKUP;
264 break;
265 case SSL_ERROR_WANT_CONNECT:
266 BIO_set_retry_special(b);
267 retry_reason = BIO_RR_CONNECT;
268 case SSL_ERROR_SYSCALL:
269 case SSL_ERROR_SSL:
270 default:
271 break;
272 }
273
274 b->retry_reason = retry_reason;
275 return (ret);
276}
277
278static long
279ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
280{
281 SSL **sslp, *ssl;
282 BIO_SSL *bs;
283 BIO *dbio, *bio;
284 long ret = 1;
285
286 bs = (BIO_SSL *)b->ptr;
287 ssl = bs->ssl;
288 if ((ssl == NULL) && (cmd != BIO_C_SET_SSL))
289 return (0);
290 switch (cmd) {
291 case BIO_CTRL_RESET:
292 SSL_shutdown(ssl);
293
294 if (ssl->handshake_func == ssl->method->ssl_connect)
295 SSL_set_connect_state(ssl);
296 else if (ssl->handshake_func == ssl->method->ssl_accept)
297 SSL_set_accept_state(ssl);
298
299 SSL_clear(ssl);
300
301 if (b->next_bio != NULL)
302 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
303 else if (ssl->rbio != NULL)
304 ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
305 else
306 ret = 1;
307 break;
308 case BIO_CTRL_INFO:
309 ret = 0;
310 break;
311 case BIO_C_SSL_MODE:
312 if (num) /* client mode */
313 SSL_set_connect_state(ssl);
314 else
315 SSL_set_accept_state(ssl);
316 break;
317 case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
318 ret = bs->renegotiate_timeout;
319 if (num < 60)
320 num = 5;
321 bs->renegotiate_timeout = (unsigned long)num;
322 bs->last_time = (unsigned long)time(NULL);
323 break;
324 case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
325 ret = bs->renegotiate_count;
326 if ((long)num >=512)
327 bs->renegotiate_count = (unsigned long)num;
328 break;
329 case BIO_C_GET_SSL_NUM_RENEGOTIATES:
330 ret = bs->num_renegotiates;
331 break;
332 case BIO_C_SET_SSL:
333 if (ssl != NULL) {
334 ssl_free(b);
335 if (!ssl_new(b))
336 return 0;
337 }
338 b->shutdown = (int)num;
339 ssl = (SSL *)ptr;
340 ((BIO_SSL *)b->ptr)->ssl = ssl;
341 bio = SSL_get_rbio(ssl);
342 if (bio != NULL) {
343 if (b->next_bio != NULL)
344 BIO_push(bio, b->next_bio);
345 b->next_bio = bio;
346 CRYPTO_add(&bio->references, 1, CRYPTO_LOCK_BIO);
347 }
348 b->init = 1;
349 break;
350 case BIO_C_GET_SSL:
351 if (ptr != NULL) {
352 sslp = (SSL **)ptr;
353 *sslp = ssl;
354 } else
355 ret = 0;
356 break;
357 case BIO_CTRL_GET_CLOSE:
358 ret = b->shutdown;
359 break;
360 case BIO_CTRL_SET_CLOSE:
361 b->shutdown = (int)num;
362 break;
363 case BIO_CTRL_WPENDING:
364 ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
365 break;
366 case BIO_CTRL_PENDING:
367 ret = SSL_pending(ssl);
368 if (ret == 0)
369 ret = BIO_pending(ssl->rbio);
370 break;
371 case BIO_CTRL_FLUSH:
372 BIO_clear_retry_flags(b);
373 ret = BIO_ctrl(ssl->wbio, cmd, num, ptr);
374 BIO_copy_next_retry(b);
375 break;
376 case BIO_CTRL_PUSH:
377 if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio)) {
378 SSL_set_bio(ssl, b->next_bio, b->next_bio);
379 CRYPTO_add(&b->next_bio->references, 1, CRYPTO_LOCK_BIO);
380 }
381 break;
382 case BIO_CTRL_POP:
383 /* Only detach if we are the BIO explicitly being popped */
384 if (b == ptr) {
385 /* Shouldn't happen in practice because the
386 * rbio and wbio are the same when pushed.
387 */
388 if (ssl->rbio != ssl->wbio)
389 BIO_free_all(ssl->wbio);
390 if (b->next_bio != NULL)
391 CRYPTO_add(&b->next_bio->references, -1, CRYPTO_LOCK_BIO);
392 ssl->wbio = NULL;
393 ssl->rbio = NULL;
394 }
395 break;
396 case BIO_C_DO_STATE_MACHINE:
397 BIO_clear_retry_flags(b);
398
399 b->retry_reason = 0;
400 ret = (int)SSL_do_handshake(ssl);
401
402 switch (SSL_get_error(ssl, (int)ret)) {
403 case SSL_ERROR_WANT_READ:
404 BIO_set_flags(b,
405 BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
406 break;
407 case SSL_ERROR_WANT_WRITE:
408 BIO_set_flags(b,
409 BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);
410 break;
411 case SSL_ERROR_WANT_CONNECT:
412 BIO_set_flags(b,
413 BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
414 b->retry_reason = b->next_bio->retry_reason;
415 break;
416 default:
417 break;
418 }
419 break;
420 case BIO_CTRL_DUP:
421 dbio = (BIO *)ptr;
422 if (((BIO_SSL *)dbio->ptr)->ssl != NULL)
423 SSL_free(((BIO_SSL *)dbio->ptr)->ssl);
424 ((BIO_SSL *)dbio->ptr)->ssl = SSL_dup(ssl);
425 ((BIO_SSL *)dbio->ptr)->renegotiate_count =
426 ((BIO_SSL *)b->ptr)->renegotiate_count;
427 ((BIO_SSL *)dbio->ptr)->byte_count =
428 ((BIO_SSL *)b->ptr)->byte_count;
429 ((BIO_SSL *)dbio->ptr)->renegotiate_timeout =
430 ((BIO_SSL *)b->ptr)->renegotiate_timeout;
431 ((BIO_SSL *)dbio->ptr)->last_time =
432 ((BIO_SSL *)b->ptr)->last_time;
433 ret = (((BIO_SSL *)dbio->ptr)->ssl != NULL);
434 break;
435 case BIO_C_GET_FD:
436 ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
437 break;
438 case BIO_CTRL_SET_CALLBACK:
439 {
440 ret = 0;
441 }
442 break;
443 case BIO_CTRL_GET_CALLBACK:
444 {
445 void (**fptr)(const SSL *xssl, int type, int val);
446
447 fptr = (void (**)(const SSL *xssl, int type, int val))ptr;
448 *fptr = SSL_get_info_callback(ssl);
449 }
450 break;
451 default:
452 ret = BIO_ctrl(ssl->rbio, cmd, num, ptr);
453 break;
454 }
455 return (ret);
456}
457
458static long
459ssl_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
460{
461 SSL *ssl;
462 BIO_SSL *bs;
463 long ret = 1;
464
465 bs = (BIO_SSL *)b->ptr;
466 ssl = bs->ssl;
467 switch (cmd) {
468 case BIO_CTRL_SET_CALLBACK:
469 {
470 /* FIXME: setting this via a completely different prototype
471 seems like a crap idea */
472 SSL_set_info_callback(ssl, (void (*)(const SSL *, int, int))fp);
473 }
474 break;
475 default:
476 ret = BIO_callback_ctrl(ssl->rbio, cmd, fp);
477 break;
478 }
479 return (ret);
480}
481
482static int
483ssl_puts(BIO *bp, const char *str)
484{
485 int n, ret;
486
487 n = strlen(str);
488 ret = BIO_write(bp, str, n);
489 return (ret);
490}
491
492BIO *
493BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
494{
495 BIO *ret = NULL, *buf = NULL, *ssl = NULL;
496
497 if ((buf = BIO_new(BIO_f_buffer())) == NULL)
498 goto err;
499 if ((ssl = BIO_new_ssl_connect(ctx)) == NULL)
500 goto err;
501 if ((ret = BIO_push(buf, ssl)) == NULL)
502 goto err;
503 return (ret);
504
505err:
506 BIO_free(buf);
507 BIO_free(ssl);
508 return (NULL);
509}
510
511BIO *
512BIO_new_ssl_connect(SSL_CTX *ctx)
513{
514 BIO *ret = NULL, *con = NULL, *ssl = NULL;
515
516 if ((con = BIO_new(BIO_s_connect())) == NULL)
517 goto err;
518 if ((ssl = BIO_new_ssl(ctx, 1)) == NULL)
519 goto err;
520 if ((ret = BIO_push(ssl, con)) == NULL)
521 goto err;
522 return (ret);
523
524err:
525 BIO_free(con);
526 BIO_free(ssl);
527 return (NULL);
528}
529
530BIO *
531BIO_new_ssl(SSL_CTX *ctx, int client)
532{
533 BIO *ret;
534 SSL *ssl;
535
536 if ((ret = BIO_new(BIO_f_ssl())) == NULL)
537 goto err;
538 if ((ssl = SSL_new(ctx)) == NULL)
539 goto err;
540
541 if (client)
542 SSL_set_connect_state(ssl);
543 else
544 SSL_set_accept_state(ssl);
545
546 BIO_set_ssl(ret, ssl, BIO_CLOSE);
547 return (ret);
548
549err:
550 BIO_free(ret);
551 return (NULL);
552}
553
554int
555BIO_ssl_copy_session_id(BIO *t, BIO *f)
556{
557 t = BIO_find_type(t, BIO_TYPE_SSL);
558 f = BIO_find_type(f, BIO_TYPE_SSL);
559 if ((t == NULL) || (f == NULL))
560 return (0);
561 if ((((BIO_SSL *)t->ptr)->ssl == NULL) ||
562 (((BIO_SSL *)f->ptr)->ssl == NULL))
563 return (0);
564 SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl, ((BIO_SSL *)f->ptr)->ssl);
565 return (1);
566}
567
568void
569BIO_ssl_shutdown(BIO *b)
570{
571 SSL *s;
572
573 while (b != NULL) {
574 if (b->method->type == BIO_TYPE_SSL) {
575 s = ((BIO_SSL *)b->ptr)->ssl;
576 SSL_shutdown(s);
577 break;
578 }
579 b = b->next_bio;
580 }
581}
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