t1_enc.c@ 86352

最後變更在這個檔案從86352是 83916,由 vboxsync 提交於 5 年前
openssl-1.1.1g: Applied and adjusted our OpenSSL changes to 1.1.1g. bugref:9719
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1	/*
2	* Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
3	* Copyright 2005 Nokia. All rights reserved.
4	*
5	* Licensed under the OpenSSL license (the "License"). You may not use
6	* this file except in compliance with the License. You can obtain a copy
7	* in the file LICENSE in the source distribution or at
8	* https://www.openssl.org/source/license.html
9	*/
10
11	#include <stdio.h>
12	#include "ssl_local.h"
13	#include <openssl/comp.h>
14	#include <openssl/evp.h>
15	#include <openssl/kdf.h>
16	#include <openssl/rand.h>
17
18	/* seed1 through seed5 are concatenated */
19	static int tls1_PRF(SSL *s,
20	const void *seed1, size_t seed1_len,
21	const void *seed2, size_t seed2_len,
22	const void *seed3, size_t seed3_len,
23	const void *seed4, size_t seed4_len,
24	const void *seed5, size_t seed5_len,
25	const unsigned char *sec, size_t slen,
26	unsigned char *out, size_t olen, int fatal)
27	{
28	const EVP_MD *md = ssl_prf_md(s);
29	EVP_PKEY_CTX *pctx = NULL;
30	int ret = 0;
31
32	if (md == NULL) {
33	/* Should never happen */
34	if (fatal)
35	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
36	ERR_R_INTERNAL_ERROR);
37	else
38	SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
39	return 0;
40	}
41	pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
42	if (pctx == NULL \|\| EVP_PKEY_derive_init(pctx) <= 0
43	\|\| EVP_PKEY_CTX_set_tls1_prf_md(pctx, md) <= 0
44	\|\| EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, sec, (int)slen) <= 0
45	\|\| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed1, (int)seed1_len) <= 0
46	\|\| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed2, (int)seed2_len) <= 0
47	\|\| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed3, (int)seed3_len) <= 0
48	\|\| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed4, (int)seed4_len) <= 0
49	\|\| EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed5, (int)seed5_len) <= 0
50	\|\| EVP_PKEY_derive(pctx, out, &olen) <= 0) {
51	if (fatal)
52	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
53	ERR_R_INTERNAL_ERROR);
54	else
55	SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
56	goto err;
57	}
58
59	ret = 1;
60
61	err:
62	EVP_PKEY_CTX_free(pctx);
63	return ret;
64	}
65
66	static int tls1_generate_key_block(SSL s, unsigned char km, size_t num)
67	{
68	int ret;
69
70	/* Calls SSLfatal() as required */
71	ret = tls1_PRF(s,
72	TLS_MD_KEY_EXPANSION_CONST,
73	TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
74	SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
75	NULL, 0, NULL, 0, s->session->master_key,
76	s->session->master_key_length, km, num, 1);
77
78	return ret;
79	}
80
81	int tls1_change_cipher_state(SSL *s, int which)
82	{
83	unsigned char p, mac_secret;
84	unsigned char ms, key, *iv;
85	EVP_CIPHER_CTX *dd;
86	const EVP_CIPHER *c;
87	#ifndef OPENSSL_NO_COMP
88	const SSL_COMP *comp;
89	#endif
90	const EVP_MD *m;
91	int mac_type;
92	size_t *mac_secret_size;
93	EVP_MD_CTX *mac_ctx;
94	EVP_PKEY *mac_key;
95	size_t n, i, j, k, cl;
96	int reuse_dd = 0;
97
98	c = s->s3->tmp.new_sym_enc;
99	m = s->s3->tmp.new_hash;
100	mac_type = s->s3->tmp.new_mac_pkey_type;
101	#ifndef OPENSSL_NO_COMP
102	comp = s->s3->tmp.new_compression;
103	#endif
104
105	if (which & SSL3_CC_READ) {
106	if (s->ext.use_etm)
107	s->s3->flags \|= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
108	else
109	s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
110
111	if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
112	s->mac_flags \|= SSL_MAC_FLAG_READ_MAC_STREAM;
113	else
114	s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
115
116	if (s->enc_read_ctx != NULL) {
117	reuse_dd = 1;
118	} else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
119	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
120	ERR_R_MALLOC_FAILURE);
121	goto err;
122	} else {
123	/*
124	* make sure it's initialised in case we exit later with an error
125	*/
126	EVP_CIPHER_CTX_reset(s->enc_read_ctx);
127	}
128	dd = s->enc_read_ctx;
129	mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
130	if (mac_ctx == NULL)
131	goto err;
132	#ifndef OPENSSL_NO_COMP
133	COMP_CTX_free(s->expand);
134	s->expand = NULL;
135	if (comp != NULL) {
136	s->expand = COMP_CTX_new(comp->method);
137	if (s->expand == NULL) {
138	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
139	SSL_F_TLS1_CHANGE_CIPHER_STATE,
140	SSL_R_COMPRESSION_LIBRARY_ERROR);
141	goto err;
142	}
143	}
144	#endif
145	/*
146	* this is done by dtls1_reset_seq_numbers for DTLS
147	*/
148	if (!SSL_IS_DTLS(s))
149	RECORD_LAYER_reset_read_sequence(&s->rlayer);
150	mac_secret = &(s->s3->read_mac_secret[0]);
151	mac_secret_size = &(s->s3->read_mac_secret_size);
152	} else {
153	s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
154	if (s->ext.use_etm)
155	s->s3->flags \|= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
156	else
157	s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
158
159	if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
160	s->mac_flags \|= SSL_MAC_FLAG_WRITE_MAC_STREAM;
161	else
162	s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
163	if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
164	reuse_dd = 1;
165	} else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
166	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
167	ERR_R_MALLOC_FAILURE);
168	goto err;
169	}
170	dd = s->enc_write_ctx;
171	if (SSL_IS_DTLS(s)) {
172	mac_ctx = EVP_MD_CTX_new();
173	if (mac_ctx == NULL) {
174	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
175	SSL_F_TLS1_CHANGE_CIPHER_STATE,
176	ERR_R_MALLOC_FAILURE);
177	goto err;
178	}
179	s->write_hash = mac_ctx;
180	} else {
181	mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
182	if (mac_ctx == NULL) {
183	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
184	SSL_F_TLS1_CHANGE_CIPHER_STATE,
185	ERR_R_MALLOC_FAILURE);
186	goto err;
187	}
188	}
189	#ifndef OPENSSL_NO_COMP
190	COMP_CTX_free(s->compress);
191	s->compress = NULL;
192	if (comp != NULL) {
193	s->compress = COMP_CTX_new(comp->method);
194	if (s->compress == NULL) {
195	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
196	SSL_F_TLS1_CHANGE_CIPHER_STATE,
197	SSL_R_COMPRESSION_LIBRARY_ERROR);
198	goto err;
199	}
200	}
201	#endif
202	/*
203	* this is done by dtls1_reset_seq_numbers for DTLS
204	*/
205	if (!SSL_IS_DTLS(s))
206	RECORD_LAYER_reset_write_sequence(&s->rlayer);
207	mac_secret = &(s->s3->write_mac_secret[0]);
208	mac_secret_size = &(s->s3->write_mac_secret_size);
209	}
210
211	if (reuse_dd)
212	EVP_CIPHER_CTX_reset(dd);
213
214	p = s->s3->tmp.key_block;
215	i = *mac_secret_size = s->s3->tmp.new_mac_secret_size;
216
217	/* TODO(size_t): convert me */
218	cl = EVP_CIPHER_key_length(c);
219	j = cl;
220	/* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
221	/* If GCM/CCM mode only part of IV comes from PRF */
222	if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
223	k = EVP_GCM_TLS_FIXED_IV_LEN;
224	else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
225	k = EVP_CCM_TLS_FIXED_IV_LEN;
226	else
227	k = EVP_CIPHER_iv_length(c);
228	if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) \|\|
229	(which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
230	ms = &(p[0]);
231	n = i + i;
232	key = &(p[n]);
233	n += j + j;
234	iv = &(p[n]);
235	n += k + k;
236	} else {
237	n = i;
238	ms = &(p[n]);
239	n += i + j;
240	key = &(p[n]);
241	n += j + k;
242	iv = &(p[n]);
243	n += k;
244	}
245
246	if (n > s->s3->tmp.key_block_length) {
247	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
248	ERR_R_INTERNAL_ERROR);
249	goto err;
250	}
251
252	memcpy(mac_secret, ms, i);
253
254	if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
255	/* TODO(size_t): Convert this function */
256	mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
257	(int)*mac_secret_size);
258	if (mac_key == NULL
259	\|\| EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
260	EVP_PKEY_free(mac_key);
261	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
262	ERR_R_INTERNAL_ERROR);
263	goto err;
264	}
265	EVP_PKEY_free(mac_key);
266	}
267	#ifdef SSL_DEBUG
268	printf("which = %04X\nmac key=", which);
269	{
270	size_t z;
271	for (z = 0; z < i; z++)
272	printf("%02X%c", ms[z], ((z + 1) % 16) ? ' ' : '\n');
273	}
274	#endif
275
276	if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
277	if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
278	\|\| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
279	iv)) {
280	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
281	ERR_R_INTERNAL_ERROR);
282	goto err;
283	}
284	} else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
285	int taglen;
286	if (s->s3->tmp.
287	new_cipher->algorithm_enc & (SSL_AES128CCM8 \| SSL_AES256CCM8))
288	taglen = EVP_CCM8_TLS_TAG_LEN;
289	else
290	taglen = EVP_CCM_TLS_TAG_LEN;
291	if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
292	\|\| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
293	\|\| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
294	\|\| !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
295	\|\| !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
296	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
297	ERR_R_INTERNAL_ERROR);
298	goto err;
299	}
300	} else {
301	if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
302	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
303	ERR_R_INTERNAL_ERROR);
304	goto err;
305	}
306	}
307	/* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
308	if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
309	&& !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
310	(int)*mac_secret_size, mac_secret)) {
311	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
312	ERR_R_INTERNAL_ERROR);
313	goto err;
314	}
315	s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
316
317	#ifdef SSL_DEBUG
318	printf("which = %04X\nkey=", which);
319	{
320	int z;
321	for (z = 0; z < EVP_CIPHER_key_length(c); z++)
322	printf("%02X%c", key[z], ((z + 1) % 16) ? ' ' : '\n');
323	}
324	printf("\niv=");
325	{
326	size_t z;
327	for (z = 0; z < k; z++)
328	printf("%02X%c", iv[z], ((z + 1) % 16) ? ' ' : '\n');
329	}
330	printf("\n");
331	#endif
332
333	return 1;
334	err:
335	return 0;
336	}
337
338	int tls1_setup_key_block(SSL *s)
339	{
340	unsigned char *p;
341	const EVP_CIPHER *c;
342	const EVP_MD *hash;
343	SSL_COMP *comp;
344	int mac_type = NID_undef;
345	size_t num, mac_secret_size = 0;
346	int ret = 0;
347
348	if (s->s3->tmp.key_block_length != 0)
349	return 1;
350
351	if (!ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size,
352	&comp, s->ext.use_etm)) {
353	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
354	SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
355	return 0;
356	}
357
358	s->s3->tmp.new_sym_enc = c;
359	s->s3->tmp.new_hash = hash;
360	s->s3->tmp.new_mac_pkey_type = mac_type;
361	s->s3->tmp.new_mac_secret_size = mac_secret_size;
362	num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
363	num *= 2;
364
365	ssl3_cleanup_key_block(s);
366
367	if ((p = OPENSSL_malloc(num)) == NULL) {
368	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
369	ERR_R_MALLOC_FAILURE);
370	goto err;
371	}
372
373	s->s3->tmp.key_block_length = num;
374	s->s3->tmp.key_block = p;
375
376	#ifdef SSL_DEBUG
377	printf("client random\n");
378	{
379	int z;
380	for (z = 0; z < SSL3_RANDOM_SIZE; z++)
381	printf("%02X%c", s->s3->client_random[z],
382	((z + 1) % 16) ? ' ' : '\n');
383	}
384	printf("server random\n");
385	{
386	int z;
387	for (z = 0; z < SSL3_RANDOM_SIZE; z++)
388	printf("%02X%c", s->s3->server_random[z],
389	((z + 1) % 16) ? ' ' : '\n');
390	}
391	printf("master key\n");
392	{
393	size_t z;
394	for (z = 0; z < s->session->master_key_length; z++)
395	printf("%02X%c", s->session->master_key[z],
396	((z + 1) % 16) ? ' ' : '\n');
397	}
398	#endif
399	if (!tls1_generate_key_block(s, p, num)) {
400	/* SSLfatal() already called */
401	goto err;
402	}
403	#ifdef SSL_DEBUG
404	printf("\nkey block\n");
405	{
406	size_t z;
407	for (z = 0; z < num; z++)
408	printf("%02X%c", p[z], ((z + 1) % 16) ? ' ' : '\n');
409	}
410	#endif
411
412	if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
413	&& s->method->version <= TLS1_VERSION) {
414	/*
415	* enable vulnerability countermeasure for CBC ciphers with known-IV
416	* problem (http://www.openssl.org/~bodo/tls-cbc.txt)
417	*/
418	s->s3->need_empty_fragments = 1;
419
420	if (s->session->cipher != NULL) {
421	if (s->session->cipher->algorithm_enc == SSL_eNULL)
422	s->s3->need_empty_fragments = 0;
423
424	#ifndef OPENSSL_NO_RC4
425	if (s->session->cipher->algorithm_enc == SSL_RC4)
426	s->s3->need_empty_fragments = 0;
427	#endif
428	}
429	}
430
431	ret = 1;
432	err:
433	return ret;
434	}
435
436	size_t tls1_final_finish_mac(SSL s, const char str, size_t slen,
437	unsigned char *out)
438	{
439	size_t hashlen;
440	unsigned char hash[EVP_MAX_MD_SIZE];
441
442	if (!ssl3_digest_cached_records(s, 0)) {
443	/* SSLfatal() already called */
444	return 0;
445	}
446
447	if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
448	/* SSLfatal() already called */
449	return 0;
450	}
451
452	if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
453	s->session->master_key, s->session->master_key_length,
454	out, TLS1_FINISH_MAC_LENGTH, 1)) {
455	/* SSLfatal() already called */
456	return 0;
457	}
458	OPENSSL_cleanse(hash, hashlen);
459	return TLS1_FINISH_MAC_LENGTH;
460	}
461
462	int tls1_generate_master_secret(SSL s, unsigned char out, unsigned char *p,
463	size_t len, size_t *secret_size)
464	{
465	if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
466	unsigned char hash[EVP_MAX_MD_SIZE * 2];
467	size_t hashlen;
468	/*
469	* Digest cached records keeping record buffer (if present): this won't
470	* affect client auth because we're freezing the buffer at the same
471	* point (after client key exchange and before certificate verify)
472	*/
473	if (!ssl3_digest_cached_records(s, 1)
474	\|\| !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
475	/* SSLfatal() already called */
476	return 0;
477	}
478	#ifdef SSL_DEBUG
479	fprintf(stderr, "Handshake hashes:\n");
480	BIO_dump_fp(stderr, (char *)hash, hashlen);
481	#endif
482	if (!tls1_PRF(s,
483	TLS_MD_EXTENDED_MASTER_SECRET_CONST,
484	TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
485	hash, hashlen,
486	NULL, 0,
487	NULL, 0,
488	NULL, 0, p, len, out,
489	SSL3_MASTER_SECRET_SIZE, 1)) {
490	/* SSLfatal() already called */
491	return 0;
492	}
493	OPENSSL_cleanse(hash, hashlen);
494	} else {
495	if (!tls1_PRF(s,
496	TLS_MD_MASTER_SECRET_CONST,
497	TLS_MD_MASTER_SECRET_CONST_SIZE,
498	s->s3->client_random, SSL3_RANDOM_SIZE,
499	NULL, 0,
500	s->s3->server_random, SSL3_RANDOM_SIZE,
501	NULL, 0, p, len, out,
502	SSL3_MASTER_SECRET_SIZE, 1)) {
503	/* SSLfatal() already called */
504	return 0;
505	}
506	}
507	#ifdef SSL_DEBUG
508	fprintf(stderr, "Premaster Secret:\n");
509	BIO_dump_fp(stderr, (char *)p, len);
510	fprintf(stderr, "Client Random:\n");
511	BIO_dump_fp(stderr, (char *)s->s3->client_random, SSL3_RANDOM_SIZE);
512	fprintf(stderr, "Server Random:\n");
513	BIO_dump_fp(stderr, (char *)s->s3->server_random, SSL3_RANDOM_SIZE);
514	fprintf(stderr, "Master Secret:\n");
515	BIO_dump_fp(stderr, (char *)s->session->master_key,
516	SSL3_MASTER_SECRET_SIZE);
517	#endif
518
519	*secret_size = SSL3_MASTER_SECRET_SIZE;
520	return 1;
521	}
522
523	int tls1_export_keying_material(SSL s, unsigned char out, size_t olen,
524	const char *label, size_t llen,
525	const unsigned char *context,
526	size_t contextlen, int use_context)
527	{
528	unsigned char *val = NULL;
529	size_t vallen = 0, currentvalpos;
530	int rv;
531
532	/*
533	* construct PRF arguments we construct the PRF argument ourself rather
534	* than passing separate values into the TLS PRF to ensure that the
535	* concatenation of values does not create a prohibited label.
536	*/
537	vallen = llen + SSL3_RANDOM_SIZE * 2;
538	if (use_context) {
539	vallen += 2 + contextlen;
540	}
541
542	val = OPENSSL_malloc(vallen);
543	if (val == NULL)
544	goto err2;
545	currentvalpos = 0;
546	memcpy(val + currentvalpos, (unsigned char *)label, llen);
547	currentvalpos += llen;
548	memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE);
549	currentvalpos += SSL3_RANDOM_SIZE;
550	memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
551	currentvalpos += SSL3_RANDOM_SIZE;
552
553	if (use_context) {
554	val[currentvalpos] = (contextlen >> 8) & 0xff;
555	currentvalpos++;
556	val[currentvalpos] = contextlen & 0xff;
557	currentvalpos++;
558	if ((contextlen > 0) \|\| (context != NULL)) {
559	memcpy(val + currentvalpos, context, contextlen);
560	}
561	}
562
563	/*
564	* disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
565	* label len) = 15, so size of val > max(prohibited label len) = 15 and
566	* the comparisons won't have buffer overflow
567	*/
568	if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
569	TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
570	goto err1;
571	if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
572	TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
573	goto err1;
574	if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
575	TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
576	goto err1;
577	if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
578	TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
579	goto err1;
580	if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
581	TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
582	goto err1;
583
584	rv = tls1_PRF(s,
585	val, vallen,
586	NULL, 0,
587	NULL, 0,
588	NULL, 0,
589	NULL, 0,
590	s->session->master_key, s->session->master_key_length,
591	out, olen, 0);
592
593	goto ret;
594	err1:
595	SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
596	rv = 0;
597	goto ret;
598	err2:
599	SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
600	rv = 0;
601	ret:
602	OPENSSL_clear_free(val, vallen);
603	return rv;
604	}
605
606	int tls1_alert_code(int code)
607	{
608	switch (code) {
609	case SSL_AD_CLOSE_NOTIFY:
610	return SSL3_AD_CLOSE_NOTIFY;
611	case SSL_AD_UNEXPECTED_MESSAGE:
612	return SSL3_AD_UNEXPECTED_MESSAGE;
613	case SSL_AD_BAD_RECORD_MAC:
614	return SSL3_AD_BAD_RECORD_MAC;
615	case SSL_AD_DECRYPTION_FAILED:
616	return TLS1_AD_DECRYPTION_FAILED;
617	case SSL_AD_RECORD_OVERFLOW:
618	return TLS1_AD_RECORD_OVERFLOW;
619	case SSL_AD_DECOMPRESSION_FAILURE:
620	return SSL3_AD_DECOMPRESSION_FAILURE;
621	case SSL_AD_HANDSHAKE_FAILURE:
622	return SSL3_AD_HANDSHAKE_FAILURE;
623	case SSL_AD_NO_CERTIFICATE:
624	return -1;
625	case SSL_AD_BAD_CERTIFICATE:
626	return SSL3_AD_BAD_CERTIFICATE;
627	case SSL_AD_UNSUPPORTED_CERTIFICATE:
628	return SSL3_AD_UNSUPPORTED_CERTIFICATE;
629	case SSL_AD_CERTIFICATE_REVOKED:
630	return SSL3_AD_CERTIFICATE_REVOKED;
631	case SSL_AD_CERTIFICATE_EXPIRED:
632	return SSL3_AD_CERTIFICATE_EXPIRED;
633	case SSL_AD_CERTIFICATE_UNKNOWN:
634	return SSL3_AD_CERTIFICATE_UNKNOWN;
635	case SSL_AD_ILLEGAL_PARAMETER:
636	return SSL3_AD_ILLEGAL_PARAMETER;
637	case SSL_AD_UNKNOWN_CA:
638	return TLS1_AD_UNKNOWN_CA;
639	case SSL_AD_ACCESS_DENIED:
640	return TLS1_AD_ACCESS_DENIED;
641	case SSL_AD_DECODE_ERROR:
642	return TLS1_AD_DECODE_ERROR;
643	case SSL_AD_DECRYPT_ERROR:
644	return TLS1_AD_DECRYPT_ERROR;
645	case SSL_AD_EXPORT_RESTRICTION:
646	return TLS1_AD_EXPORT_RESTRICTION;
647	case SSL_AD_PROTOCOL_VERSION:
648	return TLS1_AD_PROTOCOL_VERSION;
649	case SSL_AD_INSUFFICIENT_SECURITY:
650	return TLS1_AD_INSUFFICIENT_SECURITY;
651	case SSL_AD_INTERNAL_ERROR:
652	return TLS1_AD_INTERNAL_ERROR;
653	case SSL_AD_USER_CANCELLED:
654	return TLS1_AD_USER_CANCELLED;
655	case SSL_AD_NO_RENEGOTIATION:
656	return TLS1_AD_NO_RENEGOTIATION;
657	case SSL_AD_UNSUPPORTED_EXTENSION:
658	return TLS1_AD_UNSUPPORTED_EXTENSION;
659	case SSL_AD_CERTIFICATE_UNOBTAINABLE:
660	return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
661	case SSL_AD_UNRECOGNIZED_NAME:
662	return TLS1_AD_UNRECOGNIZED_NAME;
663	case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
664	return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
665	case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
666	return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
667	case SSL_AD_UNKNOWN_PSK_IDENTITY:
668	return TLS1_AD_UNKNOWN_PSK_IDENTITY;
669	case SSL_AD_INAPPROPRIATE_FALLBACK:
670	return TLS1_AD_INAPPROPRIATE_FALLBACK;
671	case SSL_AD_NO_APPLICATION_PROTOCOL:
672	return TLS1_AD_NO_APPLICATION_PROTOCOL;
673	case SSL_AD_CERTIFICATE_REQUIRED:
674	return SSL_AD_HANDSHAKE_FAILURE;
675	default:
676	return -1;
677	}
678	}

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source: vbox/trunk/src/libs/openssl-1.1.1g/ssl/t1_enc.c@ 86352

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