xref: /openbsd-src/lib/libssl/ssl_both.c (revision aa997e528a848ca5596493c2a801bdd6fb26ae61)
1 /* $OpenBSD: ssl_both.c,v 1.11 2017/10/08 16:24:02 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  * Copyright (c) 1998-2002 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  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  * ECC cipher suite support in OpenSSL originally developed by
114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
115  */
116 
117 #include <limits.h>
118 #include <stdio.h>
119 #include <string.h>
120 
121 #include "ssl_locl.h"
122 
123 #include <openssl/buffer.h>
124 #include <openssl/evp.h>
125 #include <openssl/objects.h>
126 #include <openssl/x509.h>
127 
128 #include "bytestring.h"
129 
130 /*
131  * Send s->internal->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or
132  * SSL3_RT_CHANGE_CIPHER_SPEC).
133  */
134 int
135 ssl3_do_write(SSL *s, int type)
136 {
137 	int ret;
138 
139 	ret = ssl3_write_bytes(s, type, &s->internal->init_buf->data[s->internal->init_off],
140 	    s->internal->init_num);
141 	if (ret < 0)
142 		return (-1);
143 
144 	if (type == SSL3_RT_HANDSHAKE)
145 		/*
146 		 * Should not be done for 'Hello Request's, but in that case
147 		 * we'll ignore the result anyway.
148 		 */
149 		tls1_finish_mac(s,
150 		    (unsigned char *)&s->internal->init_buf->data[s->internal->init_off], ret);
151 
152 	if (ret == s->internal->init_num) {
153 		if (s->internal->msg_callback)
154 			s->internal->msg_callback(1, s->version, type, s->internal->init_buf->data,
155 			    (size_t)(s->internal->init_off + s->internal->init_num), s,
156 			    s->internal->msg_callback_arg);
157 		return (1);
158 	}
159 
160 	s->internal->init_off += ret;
161 	s->internal->init_num -= ret;
162 
163 	return (0);
164 }
165 
166 int
167 ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
168 {
169 	CBB cbb, finished;
170 	int md_len;
171 
172 	memset(&cbb, 0, sizeof(cbb));
173 
174 	if (S3I(s)->hs.state == a) {
175 		md_len = TLS1_FINISH_MAC_LENGTH;
176 		OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE);
177 
178 		if (tls1_final_finish_mac(s, sender, slen,
179 		    S3I(s)->tmp.finish_md) != md_len)
180 			return (0);
181 		S3I(s)->tmp.finish_md_len = md_len;
182 
183 		/* Copy finished so we can use it for renegotiation checks. */
184 		if (s->internal->type == SSL_ST_CONNECT) {
185 			memcpy(S3I(s)->previous_client_finished,
186 			    S3I(s)->tmp.finish_md, md_len);
187 			S3I(s)->previous_client_finished_len = md_len;
188 		} else {
189 			memcpy(S3I(s)->previous_server_finished,
190 			    S3I(s)->tmp.finish_md, md_len);
191 			S3I(s)->previous_server_finished_len = md_len;
192 		}
193 
194 		if (!ssl3_handshake_msg_start_cbb(s, &cbb, &finished,
195 		    SSL3_MT_FINISHED))
196                         goto err;
197 		if (!CBB_add_bytes(&finished, S3I(s)->tmp.finish_md, md_len))
198 			goto err;
199 		if (!ssl3_handshake_msg_finish_cbb(s, &cbb))
200 			goto err;
201 
202 		S3I(s)->hs.state = b;
203 	}
204 
205 	return (ssl3_handshake_write(s));
206 
207  err:
208 	CBB_cleanup(&cbb);
209 
210 	return (-1);
211 }
212 
213 /*
214  * ssl3_take_mac calculates the Finished MAC for the handshakes messages seen
215  * so far.
216  */
217 static void
218 ssl3_take_mac(SSL *s)
219 {
220 	const char *sender;
221 	int slen;
222 
223 	/*
224 	 * If no new cipher setup return immediately: other functions will
225 	 * set the appropriate error.
226 	 */
227 	if (S3I(s)->hs.new_cipher == NULL)
228 		return;
229 
230 	if (S3I(s)->hs.state & SSL_ST_CONNECT) {
231 		sender = TLS_MD_SERVER_FINISH_CONST;
232 		slen = TLS_MD_SERVER_FINISH_CONST_SIZE;
233 	} else {
234 		sender = TLS_MD_CLIENT_FINISH_CONST;
235 		slen = TLS_MD_CLIENT_FINISH_CONST_SIZE;
236 	}
237 
238 	S3I(s)->tmp.peer_finish_md_len =
239 	    tls1_final_finish_mac(s, sender, slen,
240 		S3I(s)->tmp.peer_finish_md);
241 }
242 
243 int
244 ssl3_get_finished(SSL *s, int a, int b)
245 {
246 	int al, ok, md_len;
247 	long n;
248 	CBS cbs;
249 
250 	/* should actually be 36+4 :-) */
251 	n = s->method->internal->ssl_get_message(s, a, b, SSL3_MT_FINISHED, 64, &ok);
252 	if (!ok)
253 		return ((int)n);
254 
255 	/* If this occurs, we have missed a message */
256 	if (!S3I(s)->change_cipher_spec) {
257 		al = SSL_AD_UNEXPECTED_MESSAGE;
258 		SSLerror(s, SSL_R_GOT_A_FIN_BEFORE_A_CCS);
259 		goto f_err;
260 	}
261 	S3I(s)->change_cipher_spec = 0;
262 
263 	md_len = TLS1_FINISH_MAC_LENGTH;
264 
265 	if (n < 0) {
266 		al = SSL_AD_DECODE_ERROR;
267 		SSLerror(s, SSL_R_BAD_DIGEST_LENGTH);
268 		goto f_err;
269 	}
270 
271 	CBS_init(&cbs, s->internal->init_msg, n);
272 
273 	if (S3I(s)->tmp.peer_finish_md_len != md_len ||
274 	    CBS_len(&cbs) != md_len) {
275 		al = SSL_AD_DECODE_ERROR;
276 		SSLerror(s, SSL_R_BAD_DIGEST_LENGTH);
277 		goto f_err;
278 	}
279 
280 	if (!CBS_mem_equal(&cbs, S3I(s)->tmp.peer_finish_md, CBS_len(&cbs))) {
281 		al = SSL_AD_DECRYPT_ERROR;
282 		SSLerror(s, SSL_R_DIGEST_CHECK_FAILED);
283 		goto f_err;
284 	}
285 
286 	/* Copy finished so we can use it for renegotiation checks. */
287 	OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE);
288 	if (s->internal->type == SSL_ST_ACCEPT) {
289 		memcpy(S3I(s)->previous_client_finished,
290 		    S3I(s)->tmp.peer_finish_md, md_len);
291 		S3I(s)->previous_client_finished_len = md_len;
292 	} else {
293 		memcpy(S3I(s)->previous_server_finished,
294 		    S3I(s)->tmp.peer_finish_md, md_len);
295 		S3I(s)->previous_server_finished_len = md_len;
296 	}
297 
298 	return (1);
299 f_err:
300 	ssl3_send_alert(s, SSL3_AL_FATAL, al);
301 	return (0);
302 }
303 
304 /* for these 2 messages, we need to
305  * ssl->enc_read_ctx			re-init
306  * ssl->s3->internal->read_sequence		zero
307  * ssl->s3->internal->read_mac_secret		re-init
308  * ssl->session->read_sym_enc		assign
309  * ssl->session->read_hash		assign
310  */
311 int
312 ssl3_send_change_cipher_spec(SSL *s, int a, int b)
313 {
314 	size_t outlen;
315 	CBB cbb;
316 
317 	memset(&cbb, 0, sizeof(cbb));
318 
319 	if (S3I(s)->hs.state == a) {
320 		if (!CBB_init_fixed(&cbb, s->internal->init_buf->data,
321 		    s->internal->init_buf->length))
322 			goto err;
323 		if (!CBB_add_u8(&cbb, SSL3_MT_CCS))
324 			goto err;
325 		if (!CBB_finish(&cbb, NULL, &outlen))
326 			goto err;
327 
328 		if (outlen > INT_MAX)
329 			goto err;
330 
331 		s->internal->init_num = (int)outlen;
332 		s->internal->init_off = 0;
333 
334 		if (SSL_IS_DTLS(s)) {
335 			D1I(s)->handshake_write_seq =
336 			    D1I(s)->next_handshake_write_seq;
337 			dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
338 			    D1I(s)->handshake_write_seq, 0, 0);
339 			dtls1_buffer_message(s, 1);
340 		}
341 
342 		S3I(s)->hs.state = b;
343 	}
344 
345 	/* SSL3_ST_CW_CHANGE_B */
346 	return ssl3_record_write(s, SSL3_RT_CHANGE_CIPHER_SPEC);
347 
348  err:
349 	CBB_cleanup(&cbb);
350 
351 	return -1;
352 }
353 
354 static int
355 ssl3_add_cert(CBB *cbb, X509 *x)
356 {
357 	unsigned char *data;
358 	int cert_len;
359 	int ret = 0;
360 	CBB cert;
361 
362 	if ((cert_len = i2d_X509(x, NULL)) < 0)
363 		goto err;
364 
365 	if (!CBB_add_u24_length_prefixed(cbb, &cert))
366 		goto err;
367 	if (!CBB_add_space(&cert, &data, cert_len))
368 		goto err;
369 	if (i2d_X509(x, &data) < 0)
370 		goto err;
371 	if (!CBB_flush(cbb))
372 		goto err;
373 
374 	ret = 1;
375 
376  err:
377 	return (ret);
378 }
379 
380 int
381 ssl3_output_cert_chain(SSL *s, CBB *cbb, X509 *x)
382 {
383 	int no_chain = 0;
384 	CBB cert_list;
385 	int ret = 0;
386 	int i;
387 
388 	if (!CBB_add_u24_length_prefixed(cbb, &cert_list))
389 		goto err;
390 
391 	if ((s->internal->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)
392 		no_chain = 1;
393 
394 	/* TLSv1 sends a chain with nothing in it, instead of an alert. */
395 	if (x != NULL) {
396 		if (no_chain) {
397 			if (!ssl3_add_cert(&cert_list, x))
398 				goto err;
399 		} else {
400 			X509_STORE_CTX xs_ctx;
401 
402 			if (!X509_STORE_CTX_init(&xs_ctx, s->ctx->cert_store,
403 			    x, NULL)) {
404 				SSLerror(s, ERR_R_X509_LIB);
405 				goto err;
406 			}
407 			X509_verify_cert(&xs_ctx);
408 
409 			/* Don't leave errors in the queue. */
410 			ERR_clear_error();
411 			for (i = 0; i < sk_X509_num(xs_ctx.chain); i++) {
412 				x = sk_X509_value(xs_ctx.chain, i);
413 				if (!ssl3_add_cert(&cert_list, x)) {
414 					X509_STORE_CTX_cleanup(&xs_ctx);
415 					goto err;
416 				}
417 			}
418 			X509_STORE_CTX_cleanup(&xs_ctx);
419 		}
420 	}
421 
422 	/* Thawte special :-) */
423 	for (i = 0; i < sk_X509_num(s->ctx->extra_certs); i++) {
424 		x = sk_X509_value(s->ctx->extra_certs, i);
425 		if (!ssl3_add_cert(&cert_list, x))
426 			goto err;
427 	}
428 
429 	if (!CBB_flush(cbb))
430 		goto err;
431 
432 	ret = 1;
433 
434  err:
435 	return (ret);
436 }
437 
438 /*
439  * Obtain handshake message of message type 'mt' (any if mt == -1),
440  * maximum acceptable body length 'max'.
441  * The first four bytes (msg_type and length) are read in state 'st1',
442  * the body is read in state 'stn'.
443  */
444 long
445 ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
446 {
447 	unsigned char *p;
448 	uint32_t l;
449 	long n;
450 	int i, al;
451 	CBS cbs;
452 	uint8_t u8;
453 
454 	if (S3I(s)->tmp.reuse_message) {
455 		S3I(s)->tmp.reuse_message = 0;
456 		if ((mt >= 0) && (S3I(s)->tmp.message_type != mt)) {
457 			al = SSL_AD_UNEXPECTED_MESSAGE;
458 			SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
459 			goto f_err;
460 		}
461 		*ok = 1;
462 		s->internal->init_msg = s->internal->init_buf->data + 4;
463 		s->internal->init_num = (int)S3I(s)->tmp.message_size;
464 		return s->internal->init_num;
465 	}
466 
467 	p = (unsigned char *)s->internal->init_buf->data;
468 
469 	/* s->internal->init_num < 4 */
470 	if (S3I(s)->hs.state == st1) {
471 		int skip_message;
472 
473 		do {
474 			while (s->internal->init_num < 4) {
475 				i = s->method->internal->ssl_read_bytes(s,
476 				    SSL3_RT_HANDSHAKE, &p[s->internal->init_num],
477 				    4 - s->internal->init_num, 0);
478 				if (i <= 0) {
479 					s->internal->rwstate = SSL_READING;
480 					*ok = 0;
481 					return i;
482 				}
483 				s->internal->init_num += i;
484 			}
485 
486 			skip_message = 0;
487 			if (!s->server && p[0] == SSL3_MT_HELLO_REQUEST) {
488 				/*
489 				 * The server may always send 'Hello Request'
490 				 * messages -- we are doing a handshake anyway
491 				 * now, so ignore them if their format is
492 				 * correct.  Does not count for 'Finished' MAC.
493 				 */
494 				if (p[1] == 0 && p[2] == 0 &&p[3] == 0) {
495 					s->internal->init_num = 0;
496 					skip_message = 1;
497 
498 					if (s->internal->msg_callback)
499 						s->internal->msg_callback(0, s->version,
500 						    SSL3_RT_HANDSHAKE, p, 4, s,
501 						    s->internal->msg_callback_arg);
502 				}
503 			}
504 		} while (skip_message);
505 
506 		/* s->internal->init_num == 4 */
507 
508 		if ((mt >= 0) && (*p != mt)) {
509 			al = SSL_AD_UNEXPECTED_MESSAGE;
510 			SSLerror(s, SSL_R_UNEXPECTED_MESSAGE);
511 			goto f_err;
512 		}
513 
514 		CBS_init(&cbs, p, 4);
515 		if (!CBS_get_u8(&cbs, &u8) ||
516 		    !CBS_get_u24(&cbs, &l)) {
517 			SSLerror(s, ERR_R_BUF_LIB);
518 			goto err;
519 		}
520 		S3I(s)->tmp.message_type = u8;
521 
522 		if (l > (unsigned long)max) {
523 			al = SSL_AD_ILLEGAL_PARAMETER;
524 			SSLerror(s, SSL_R_EXCESSIVE_MESSAGE_SIZE);
525 			goto f_err;
526 		}
527 		if (l && !BUF_MEM_grow_clean(s->internal->init_buf, l + 4)) {
528 			SSLerror(s, ERR_R_BUF_LIB);
529 			goto err;
530 		}
531 		S3I(s)->tmp.message_size = l;
532 		S3I(s)->hs.state = stn;
533 
534 		s->internal->init_msg = s->internal->init_buf->data + 4;
535 		s->internal->init_num = 0;
536 	}
537 
538 	/* next state (stn) */
539 	p = s->internal->init_msg;
540 	n = S3I(s)->tmp.message_size - s->internal->init_num;
541 	while (n > 0) {
542 		i = s->method->internal->ssl_read_bytes(s, SSL3_RT_HANDSHAKE,
543 		    &p[s->internal->init_num], n, 0);
544 		if (i <= 0) {
545 			s->internal->rwstate = SSL_READING;
546 			*ok = 0;
547 			return i;
548 		}
549 		s->internal->init_num += i;
550 		n -= i;
551 	}
552 
553 	/* If receiving Finished, record MAC of prior handshake messages for
554 	 * Finished verification. */
555 	if (*s->internal->init_buf->data == SSL3_MT_FINISHED)
556 		ssl3_take_mac(s);
557 
558 	/* Feed this message into MAC computation. */
559 	if (s->internal->mac_packet) {
560 		tls1_finish_mac(s, (unsigned char *)s->internal->init_buf->data,
561 		    s->internal->init_num + 4);
562 
563 		if (s->internal->msg_callback)
564 			s->internal->msg_callback(0, s->version,
565 			    SSL3_RT_HANDSHAKE, s->internal->init_buf->data,
566 			    (size_t)s->internal->init_num + 4, s,
567 			    s->internal->msg_callback_arg);
568 	}
569 
570 	*ok = 1;
571 	return (s->internal->init_num);
572 
573 f_err:
574 	ssl3_send_alert(s, SSL3_AL_FATAL, al);
575 err:
576 	*ok = 0;
577 	return (-1);
578 }
579 
580 int
581 ssl_cert_type(X509 *x, EVP_PKEY *pkey)
582 {
583 	EVP_PKEY *pk;
584 	int ret = -1, i;
585 
586 	if (pkey == NULL)
587 		pk = X509_get_pubkey(x);
588 	else
589 		pk = pkey;
590 	if (pk == NULL)
591 		goto err;
592 
593 	i = pk->type;
594 	if (i == EVP_PKEY_RSA) {
595 		ret = SSL_PKEY_RSA_ENC;
596 	} else if (i == EVP_PKEY_EC) {
597 		ret = SSL_PKEY_ECC;
598 	} else if (i == NID_id_GostR3410_2001 ||
599 	    i == NID_id_GostR3410_2001_cc) {
600 		ret = SSL_PKEY_GOST01;
601 	}
602 
603 err:
604 	if (!pkey)
605 		EVP_PKEY_free(pk);
606 	return (ret);
607 }
608 
609 int
610 ssl_verify_alarm_type(long type)
611 {
612 	int al;
613 
614 	switch (type) {
615 	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
616 	case X509_V_ERR_UNABLE_TO_GET_CRL:
617 	case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
618 		al = SSL_AD_UNKNOWN_CA;
619 		break;
620 	case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
621 	case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
622 	case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
623 	case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
624 	case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
625 	case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
626 	case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
627 	case X509_V_ERR_CERT_NOT_YET_VALID:
628 	case X509_V_ERR_CRL_NOT_YET_VALID:
629 	case X509_V_ERR_CERT_UNTRUSTED:
630 	case X509_V_ERR_CERT_REJECTED:
631 		al = SSL_AD_BAD_CERTIFICATE;
632 		break;
633 	case X509_V_ERR_CERT_SIGNATURE_FAILURE:
634 	case X509_V_ERR_CRL_SIGNATURE_FAILURE:
635 		al = SSL_AD_DECRYPT_ERROR;
636 		break;
637 	case X509_V_ERR_CERT_HAS_EXPIRED:
638 	case X509_V_ERR_CRL_HAS_EXPIRED:
639 		al = SSL_AD_CERTIFICATE_EXPIRED;
640 		break;
641 	case X509_V_ERR_CERT_REVOKED:
642 		al = SSL_AD_CERTIFICATE_REVOKED;
643 		break;
644 	case X509_V_ERR_OUT_OF_MEM:
645 		al = SSL_AD_INTERNAL_ERROR;
646 		break;
647 	case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
648 	case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
649 	case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
650 	case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
651 	case X509_V_ERR_CERT_CHAIN_TOO_LONG:
652 	case X509_V_ERR_PATH_LENGTH_EXCEEDED:
653 	case X509_V_ERR_INVALID_CA:
654 		al = SSL_AD_UNKNOWN_CA;
655 		break;
656 	case X509_V_ERR_APPLICATION_VERIFICATION:
657 		al = SSL_AD_HANDSHAKE_FAILURE;
658 		break;
659 	case X509_V_ERR_INVALID_PURPOSE:
660 		al = SSL_AD_UNSUPPORTED_CERTIFICATE;
661 		break;
662 	default:
663 		al = SSL_AD_CERTIFICATE_UNKNOWN;
664 		break;
665 	}
666 	return (al);
667 }
668 
669 int
670 ssl3_setup_init_buffer(SSL *s)
671 {
672 	BUF_MEM *buf = NULL;
673 
674 	if (s->internal->init_buf != NULL)
675 		return (1);
676 
677 	if ((buf = BUF_MEM_new()) == NULL)
678 		goto err;
679 	if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH))
680 		goto err;
681 
682 	s->internal->init_buf = buf;
683 	return (1);
684 
685 err:
686 	BUF_MEM_free(buf);
687 	return (0);
688 }
689 
690 int
691 ssl3_setup_read_buffer(SSL *s)
692 {
693 	unsigned char *p;
694 	size_t len, align, headerlen;
695 
696 	if (SSL_IS_DTLS(s))
697 		headerlen = DTLS1_RT_HEADER_LENGTH;
698 	else
699 		headerlen = SSL3_RT_HEADER_LENGTH;
700 
701 	align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
702 
703 	if (s->s3->rbuf.buf == NULL) {
704 		len = SSL3_RT_MAX_PLAIN_LENGTH +
705 		    SSL3_RT_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
706 		if ((p = malloc(len)) == NULL)
707 			goto err;
708 		s->s3->rbuf.buf = p;
709 		s->s3->rbuf.len = len;
710 	}
711 
712 	s->internal->packet = &(s->s3->rbuf.buf[0]);
713 	return 1;
714 
715 err:
716 	SSLerror(s, ERR_R_MALLOC_FAILURE);
717 	return 0;
718 }
719 
720 int
721 ssl3_setup_write_buffer(SSL *s)
722 {
723 	unsigned char *p;
724 	size_t len, align, headerlen;
725 
726 	if (SSL_IS_DTLS(s))
727 		headerlen = DTLS1_RT_HEADER_LENGTH + 1;
728 	else
729 		headerlen = SSL3_RT_HEADER_LENGTH;
730 
731 	align = (-SSL3_RT_HEADER_LENGTH) & (SSL3_ALIGN_PAYLOAD - 1);
732 
733 	if (s->s3->wbuf.buf == NULL) {
734 		len = s->max_send_fragment +
735 		    SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD + headerlen + align;
736 		if (!(s->internal->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
737 			len += headerlen + align +
738 			    SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
739 
740 		if ((p = malloc(len)) == NULL)
741 			goto err;
742 		s->s3->wbuf.buf = p;
743 		s->s3->wbuf.len = len;
744 	}
745 
746 	return 1;
747 
748 err:
749 	SSLerror(s, ERR_R_MALLOC_FAILURE);
750 	return 0;
751 }
752 
753 int
754 ssl3_setup_buffers(SSL *s)
755 {
756 	if (!ssl3_setup_read_buffer(s))
757 		return 0;
758 	if (!ssl3_setup_write_buffer(s))
759 		return 0;
760 	return 1;
761 }
762 
763 int
764 ssl3_release_write_buffer(SSL *s)
765 {
766 	free(s->s3->wbuf.buf);
767 	s->s3->wbuf.buf = NULL;
768 	return 1;
769 }
770 
771 int
772 ssl3_release_read_buffer(SSL *s)
773 {
774 	free(s->s3->rbuf.buf);
775 	s->s3->rbuf.buf = NULL;
776 	return 1;
777 }
778