tls13_enc.c@ 91527

Last change on this file since 91527 was 90293, checked in by vboxsync, 3 years ago
openssl-1.1.1k: Applied and adjusted our OpenSSL changes to 1.1.1k. bugref:10072
File size: 33.0 KB

Line
1	/*
2	* Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
3	*
4	* Licensed under the OpenSSL license (the "License"). You may not use
5	* this file except in compliance with the License. You can obtain a copy
6	* in the file LICENSE in the source distribution or at
7	* https://www.openssl.org/source/license.html
8	*/
9
10	#include <stdlib.h>
11	#include "ssl_local.h"
12	#include "internal/cryptlib.h"
13	#include <openssl/evp.h>
14	#include <openssl/kdf.h>
15
16	#define TLS13_MAX_LABEL_LEN 249
17
18	/* Always filled with zeros */
19	static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
20
21	/*
22	* Given a \|secret\|; a \|label\| of length \|labellen\|; and \|data\| of length
23	* \|datalen\| (e.g. typically a hash of the handshake messages), derive a new
24	* secret \|outlen\| bytes long and store it in the location pointed to be \|out\|.
25	* The \|data\| value may be zero length. Any errors will be treated as fatal if
26	* \|fatal\| is set. Returns 1 on success 0 on failure.
27	*/
28	int tls13_hkdf_expand(SSL s, const EVP_MD md, const unsigned char *secret,
29	const unsigned char *label, size_t labellen,
30	const unsigned char *data, size_t datalen,
31	unsigned char *out, size_t outlen, int fatal)
32	{
33	#ifdef CHARSET_EBCDIC
34	static const unsigned char label_prefix[] = { 0x74, 0x6C, 0x73, 0x31, 0x33, 0x20, 0x00 };
35	#else
36	static const unsigned char label_prefix[] = "tls13 ";
37	#endif
38	EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
39	int ret;
40	size_t hkdflabellen;
41	size_t hashlen;
42	/*
43	* 2 bytes for length of derived secret + 1 byte for length of combined
44	* prefix and label + bytes for the label itself + 1 byte length of hash
45	* + bytes for the hash itself
46	*/
47	unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t)
48	+ (sizeof(label_prefix) - 1) + TLS13_MAX_LABEL_LEN
49	+ 1 + EVP_MAX_MD_SIZE];
50	WPACKET pkt;
51
52	if (pctx == NULL)
53	return 0;
54
55	if (labellen > TLS13_MAX_LABEL_LEN) {
56	if (fatal) {
57	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
58	ERR_R_INTERNAL_ERROR);
59	} else {
60	/*
61	* Probably we have been called from SSL_export_keying_material(),
62	* or SSL_export_keying_material_early().
63	*/
64	SSLerr(SSL_F_TLS13_HKDF_EXPAND, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
65	}
66	EVP_PKEY_CTX_free(pctx);
67	return 0;
68	}
69
70	hashlen = EVP_MD_size(md);
71
72	if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
73	\|\| !WPACKET_put_bytes_u16(&pkt, outlen)
74	\|\| !WPACKET_start_sub_packet_u8(&pkt)
75	\|\| !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1)
76	\|\| !WPACKET_memcpy(&pkt, label, labellen)
77	\|\| !WPACKET_close(&pkt)
78	\|\| !WPACKET_sub_memcpy_u8(&pkt, data, (data == NULL) ? 0 : datalen)
79	\|\| !WPACKET_get_total_written(&pkt, &hkdflabellen)
80	\|\| !WPACKET_finish(&pkt)) {
81	EVP_PKEY_CTX_free(pctx);
82	WPACKET_cleanup(&pkt);
83	if (fatal)
84	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
85	ERR_R_INTERNAL_ERROR);
86	else
87	SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
88	return 0;
89	}
90
91	ret = EVP_PKEY_derive_init(pctx) <= 0
92	\|\| EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY)
93	<= 0
94	\|\| EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
95	\|\| EVP_PKEY_CTX_set1_hkdf_key(pctx, secret, hashlen) <= 0
96	\|\| EVP_PKEY_CTX_add1_hkdf_info(pctx, hkdflabel, hkdflabellen) <= 0
97	\|\| EVP_PKEY_derive(pctx, out, &outlen) <= 0;
98
99	EVP_PKEY_CTX_free(pctx);
100
101	if (ret != 0) {
102	if (fatal)
103	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_HKDF_EXPAND,
104	ERR_R_INTERNAL_ERROR);
105	else
106	SSLerr(SSL_F_TLS13_HKDF_EXPAND, ERR_R_INTERNAL_ERROR);
107	}
108
109	return ret == 0;
110	}
111
112	/*
113	* Given a \|secret\| generate a \|key\| of length \|keylen\| bytes. Returns 1 on
114	* success 0 on failure.
115	*/
116	int tls13_derive_key(SSL s, const EVP_MD md, const unsigned char *secret,
117	unsigned char *key, size_t keylen)
118	{
119	#ifdef CHARSET_EBCDIC
120	static const unsigned char keylabel[] ={ 0x6B, 0x65, 0x79, 0x00 };
121	#else
122	static const unsigned char keylabel[] = "key";
123	#endif
124
125	return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
126	NULL, 0, key, keylen, 1);
127	}
128
129	/*
130	* Given a \|secret\| generate an \|iv\| of length \|ivlen\| bytes. Returns 1 on
131	* success 0 on failure.
132	*/
133	int tls13_derive_iv(SSL s, const EVP_MD md, const unsigned char *secret,
134	unsigned char *iv, size_t ivlen)
135	{
136	#ifdef CHARSET_EBCDIC
137	static const unsigned char ivlabel[] = { 0x69, 0x76, 0x00 };
138	#else
139	static const unsigned char ivlabel[] = "iv";
140	#endif
141
142	return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
143	NULL, 0, iv, ivlen, 1);
144	}
145
146	int tls13_derive_finishedkey(SSL s, const EVP_MD md,
147	const unsigned char *secret,
148	unsigned char *fin, size_t finlen)
149	{
150	#ifdef CHARSET_EBCDIC
151	static const unsigned char finishedlabel[] = { 0x66, 0x69, 0x6E, 0x69, 0x73, 0x68, 0x65, 0x64, 0x00 };
152	#else
153	static const unsigned char finishedlabel[] = "finished";
154	#endif
155
156	return tls13_hkdf_expand(s, md, secret, finishedlabel,
157	sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
158	}
159
160	/*
161	* Given the previous secret \|prevsecret\| and a new input secret \|insecret\| of
162	* length \|insecretlen\|, generate a new secret and store it in the location
163	* pointed to by \|outsecret\|. Returns 1 on success 0 on failure.
164	*/
165	int tls13_generate_secret(SSL s, const EVP_MD md,
166	const unsigned char *prevsecret,
167	const unsigned char *insecret,
168	size_t insecretlen,
169	unsigned char *outsecret)
170	{
171	size_t mdlen, prevsecretlen;
172	int mdleni;
173	int ret;
174	EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
175	#ifdef CHARSET_EBCDIC
176	static const char derived_secret_label[] = { 0x64, 0x65, 0x72, 0x69, 0x76, 0x65, 0x64, 0x00 };
177	#else
178	static const char derived_secret_label[] = "derived";
179	#endif
180	unsigned char preextractsec[EVP_MAX_MD_SIZE];
181
182	if (pctx == NULL) {
183	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
184	ERR_R_INTERNAL_ERROR);
185	return 0;
186	}
187
188	mdleni = EVP_MD_size(md);
189	/* Ensure cast to size_t is safe */
190	if (!ossl_assert(mdleni >= 0)) {
191	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
192	ERR_R_INTERNAL_ERROR);
193	return 0;
194	}
195	mdlen = (size_t)mdleni;
196
197	if (insecret == NULL) {
198	insecret = default_zeros;
199	insecretlen = mdlen;
200	}
201	if (prevsecret == NULL) {
202	prevsecret = default_zeros;
203	prevsecretlen = 0;
204	} else {
205	EVP_MD_CTX *mctx = EVP_MD_CTX_new();
206	unsigned char hash[EVP_MAX_MD_SIZE];
207
208	/* The pre-extract derive step uses a hash of no messages */
209	if (mctx == NULL
210	\|\| EVP_DigestInit_ex(mctx, md, NULL) <= 0
211	\|\| EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
212	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
213	ERR_R_INTERNAL_ERROR);
214	EVP_MD_CTX_free(mctx);
215	EVP_PKEY_CTX_free(pctx);
216	return 0;
217	}
218	EVP_MD_CTX_free(mctx);
219
220	/* Generate the pre-extract secret */
221	if (!tls13_hkdf_expand(s, md, prevsecret,
222	(unsigned char *)derived_secret_label,
223	sizeof(derived_secret_label) - 1, hash, mdlen,
224	preextractsec, mdlen, 1)) {
225	/* SSLfatal() already called */
226	EVP_PKEY_CTX_free(pctx);
227	return 0;
228	}
229
230	prevsecret = preextractsec;
231	prevsecretlen = mdlen;
232	}
233
234	ret = EVP_PKEY_derive_init(pctx) <= 0
235	\|\| EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY)
236	<= 0
237	\|\| EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
238	\|\| EVP_PKEY_CTX_set1_hkdf_key(pctx, insecret, insecretlen) <= 0
239	\|\| EVP_PKEY_CTX_set1_hkdf_salt(pctx, prevsecret, prevsecretlen)
240	<= 0
241	\|\| EVP_PKEY_derive(pctx, outsecret, &mdlen)
242	<= 0;
243
244	if (ret != 0)
245	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_GENERATE_SECRET,
246	ERR_R_INTERNAL_ERROR);
247
248	EVP_PKEY_CTX_free(pctx);
249	if (prevsecret == preextractsec)
250	OPENSSL_cleanse(preextractsec, mdlen);
251	return ret == 0;
252	}
253
254	/*
255	* Given an input secret \|insecret\| of length \|insecretlen\| generate the
256	* handshake secret. This requires the early secret to already have been
257	* generated. Returns 1 on success 0 on failure.
258	*/
259	int tls13_generate_handshake_secret(SSL s, const unsigned char insecret,
260	size_t insecretlen)
261	{
262	/* Calls SSLfatal() if required */
263	return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
264	insecret, insecretlen,
265	(unsigned char *)&s->handshake_secret);
266	}
267
268	/*
269	* Given the handshake secret \|prev\| of length \|prevlen\| generate the master
270	* secret and store its length in \|*secret_size\|. Returns 1 on success 0 on
271	* failure.
272	*/
273	int tls13_generate_master_secret(SSL s, unsigned char out,
274	unsigned char *prev, size_t prevlen,
275	size_t *secret_size)
276	{
277	const EVP_MD *md = ssl_handshake_md(s);
278
279	*secret_size = EVP_MD_size(md);
280	/* Calls SSLfatal() if required */
281	return tls13_generate_secret(s, md, prev, NULL, 0, out);
282	}
283
284	/*
285	* Generates the mac for the Finished message. Returns the length of the MAC or
286	* 0 on error.
287	*/
288	size_t tls13_final_finish_mac(SSL s, const char str, size_t slen,
289	unsigned char *out)
290	{
291	const EVP_MD *md = ssl_handshake_md(s);
292	unsigned char hash[EVP_MAX_MD_SIZE];
293	size_t hashlen, ret = 0;
294	EVP_PKEY *key = NULL;
295	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
296
297	if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
298	/* SSLfatal() already called */
299	goto err;
300	}
301
302	if (str == s->method->ssl3_enc->server_finished_label) {
303	key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
304	s->server_finished_secret, hashlen);
305	} else if (SSL_IS_FIRST_HANDSHAKE(s)) {
306	key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL,
307	s->client_finished_secret, hashlen);
308	} else {
309	unsigned char finsecret[EVP_MAX_MD_SIZE];
310
311	if (!tls13_derive_finishedkey(s, ssl_handshake_md(s),
312	s->client_app_traffic_secret,
313	finsecret, hashlen))
314	goto err;
315
316	key = EVP_PKEY_new_raw_private_key(EVP_PKEY_HMAC, NULL, finsecret,
317	hashlen);
318	OPENSSL_cleanse(finsecret, sizeof(finsecret));
319	}
320
321	if (key == NULL
322	\|\| ctx == NULL
323	\|\| EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
324	\|\| EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
325	\|\| EVP_DigestSignFinal(ctx, out, &hashlen) <= 0) {
326	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_FINAL_FINISH_MAC,
327	ERR_R_INTERNAL_ERROR);
328	goto err;
329	}
330
331	ret = hashlen;
332	err:
333	EVP_PKEY_free(key);
334	EVP_MD_CTX_free(ctx);
335	return ret;
336	}
337
338	/*
339	* There isn't really a key block in TLSv1.3, but we still need this function
340	* for initialising the cipher and hash. Returns 1 on success or 0 on failure.
341	*/
342	int tls13_setup_key_block(SSL *s)
343	{
344	const EVP_CIPHER *c;
345	const EVP_MD *hash;
346
347	s->session->cipher = s->s3->tmp.new_cipher;
348	if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, NULL, 0)) {
349	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS13_SETUP_KEY_BLOCK,
350	SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
351	return 0;
352	}
353
354	s->s3->tmp.new_sym_enc = c;
355	s->s3->tmp.new_hash = hash;
356
357	return 1;
358	}
359
360	static int derive_secret_key_and_iv(SSL s, int sending, const EVP_MD md,
361	const EVP_CIPHER *ciph,
362	const unsigned char *insecret,
363	const unsigned char *hash,
364	const unsigned char *label,
365	size_t labellen, unsigned char *secret,
366	unsigned char iv, EVP_CIPHER_CTX ciph_ctx)
367	{
368	unsigned char key[EVP_MAX_KEY_LENGTH];
369	size_t ivlen, keylen, taglen;
370	int hashleni = EVP_MD_size(md);
371	size_t hashlen;
372
373	/* Ensure cast to size_t is safe */
374	if (!ossl_assert(hashleni >= 0)) {
375	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
376	ERR_R_EVP_LIB);
377	goto err;
378	}
379	hashlen = (size_t)hashleni;
380
381	if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
382	secret, hashlen, 1)) {
383	/* SSLfatal() already called */
384	goto err;
385	}
386
387	/* TODO(size_t): convert me */
388	keylen = EVP_CIPHER_key_length(ciph);
389	if (EVP_CIPHER_mode(ciph) == EVP_CIPH_CCM_MODE) {
390	uint32_t algenc;
391
392	ivlen = EVP_CCM_TLS_IV_LEN;
393	if (s->s3->tmp.new_cipher != NULL) {
394	algenc = s->s3->tmp.new_cipher->algorithm_enc;
395	} else if (s->session->cipher != NULL) {
396	/* We've not selected a cipher yet - we must be doing early data */
397	algenc = s->session->cipher->algorithm_enc;
398	} else if (s->psksession != NULL && s->psksession->cipher != NULL) {
399	/* We must be doing early data with out-of-band PSK */
400	algenc = s->psksession->cipher->algorithm_enc;
401	} else {
402	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
403	ERR_R_EVP_LIB);
404	goto err;
405	}
406	if (algenc & (SSL_AES128CCM8 \| SSL_AES256CCM8))
407	taglen = EVP_CCM8_TLS_TAG_LEN;
408	else
409	taglen = EVP_CCM_TLS_TAG_LEN;
410	} else {
411	ivlen = EVP_CIPHER_iv_length(ciph);
412	taglen = 0;
413	}
414
415	if (!tls13_derive_key(s, md, secret, key, keylen)
416	\|\| !tls13_derive_iv(s, md, secret, iv, ivlen)) {
417	/* SSLfatal() already called */
418	goto err;
419	}
420
421	if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
422	\|\| !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL)
423	\|\| (taglen != 0 && !EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
424	taglen, NULL))
425	\|\| EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) {
426	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_DERIVE_SECRET_KEY_AND_IV,
427	ERR_R_EVP_LIB);
428	goto err;
429	}
430
431	return 1;
432	err:
433	OPENSSL_cleanse(key, sizeof(key));
434	return 0;
435	}
436
437	int tls13_change_cipher_state(SSL *s, int which)
438	{
439	#ifdef CHARSET_EBCDIC
440	static const unsigned char client_early_traffic[] = {0x63, 0x20, 0x65, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
441	static const unsigned char client_handshake_traffic[] = {0x63, 0x20, 0x68, 0x73, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
442	static const unsigned char client_application_traffic[] = {0x63, 0x20, 0x61, 0x70, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
443	static const unsigned char server_handshake_traffic[] = {0x73, 0x20, 0x68, 0x73, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
444	static const unsigned char server_application_traffic[] = {0x73, 0x20, 0x61, 0x70, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
445	static const unsigned char exporter_master_secret[] = {0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
446	static const unsigned char resumption_master_secret[] = {0x72, 0x65, 0x73, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
447	static const unsigned char early_exporter_master_secret[] = {0x65, 0x20, 0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
448	#else
449	static const unsigned char client_early_traffic[] = "c e traffic";
450	static const unsigned char client_handshake_traffic[] = "c hs traffic";
451	static const unsigned char client_application_traffic[] = "c ap traffic";
452	static const unsigned char server_handshake_traffic[] = "s hs traffic";
453	static const unsigned char server_application_traffic[] = "s ap traffic";
454	static const unsigned char exporter_master_secret[] = "exp master";
455	static const unsigned char resumption_master_secret[] = "res master";
456	static const unsigned char early_exporter_master_secret[] = "e exp master";
457	#endif
458	unsigned char *iv;
459	unsigned char secret[EVP_MAX_MD_SIZE];
460	unsigned char hashval[EVP_MAX_MD_SIZE];
461	unsigned char *hash = hashval;
462	unsigned char *insecret;
463	unsigned char *finsecret = NULL;
464	const char *log_label = NULL;
465	EVP_CIPHER_CTX *ciph_ctx;
466	size_t finsecretlen = 0;
467	const unsigned char *label;
468	size_t labellen, hashlen = 0;
469	int ret = 0;
470	const EVP_MD *md = NULL;
471	const EVP_CIPHER *cipher = NULL;
472
473	if (which & SSL3_CC_READ) {
474	if (s->enc_read_ctx != NULL) {
475	EVP_CIPHER_CTX_reset(s->enc_read_ctx);
476	} else {
477	s->enc_read_ctx = EVP_CIPHER_CTX_new();
478	if (s->enc_read_ctx == NULL) {
479	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
480	SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
481	goto err;
482	}
483	}
484	ciph_ctx = s->enc_read_ctx;
485	iv = s->read_iv;
486
487	RECORD_LAYER_reset_read_sequence(&s->rlayer);
488	} else {
489	s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
490	if (s->enc_write_ctx != NULL) {
491	EVP_CIPHER_CTX_reset(s->enc_write_ctx);
492	} else {
493	s->enc_write_ctx = EVP_CIPHER_CTX_new();
494	if (s->enc_write_ctx == NULL) {
495	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
496	SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
497	goto err;
498	}
499	}
500	ciph_ctx = s->enc_write_ctx;
501	iv = s->write_iv;
502
503	RECORD_LAYER_reset_write_sequence(&s->rlayer);
504	}
505
506	if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
507	\|\| ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
508	if (which & SSL3_CC_EARLY) {
509	EVP_MD_CTX *mdctx = NULL;
510	long handlen;
511	void *hdata;
512	unsigned int hashlenui;
513	const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
514
515	insecret = s->early_secret;
516	label = client_early_traffic;
517	labellen = sizeof(client_early_traffic) - 1;
518	log_label = CLIENT_EARLY_LABEL;
519
520	handlen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
521	if (handlen <= 0) {
522	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
523	SSL_F_TLS13_CHANGE_CIPHER_STATE,
524	SSL_R_BAD_HANDSHAKE_LENGTH);
525	goto err;
526	}
527
528	if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
529	&& s->max_early_data > 0
530	&& s->session->ext.max_early_data == 0) {
531	/*
532	* If we are attempting to send early data, and we've decided to
533	* actually do it but max_early_data in s->session is 0 then we
534	* must be using an external PSK.
535	*/
536	if (!ossl_assert(s->psksession != NULL
537	&& s->max_early_data ==
538	s->psksession->ext.max_early_data)) {
539	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
540	SSL_F_TLS13_CHANGE_CIPHER_STATE,
541	ERR_R_INTERNAL_ERROR);
542	goto err;
543	}
544	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
545	}
546	if (sslcipher == NULL) {
547	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
548	SSL_F_TLS13_CHANGE_CIPHER_STATE, SSL_R_BAD_PSK);
549	goto err;
550	}
551
552	/*
553	* We need to calculate the handshake digest using the digest from
554	* the session. We haven't yet selected our ciphersuite so we can't
555	* use ssl_handshake_md().
556	*/
557	mdctx = EVP_MD_CTX_new();
558	if (mdctx == NULL) {
559	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
560	SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
561	goto err;
562	}
563	cipher = EVP_get_cipherbynid(SSL_CIPHER_get_cipher_nid(sslcipher));
564	md = ssl_md(sslcipher->algorithm2);
565	if (md == NULL \|\| !EVP_DigestInit_ex(mdctx, md, NULL)
566	\|\| !EVP_DigestUpdate(mdctx, hdata, handlen)
567	\|\| !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
568	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
569	SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
570	EVP_MD_CTX_free(mdctx);
571	goto err;
572	}
573	hashlen = hashlenui;
574	EVP_MD_CTX_free(mdctx);
575
576	if (!tls13_hkdf_expand(s, md, insecret,
577	early_exporter_master_secret,
578	sizeof(early_exporter_master_secret) - 1,
579	hashval, hashlen,
580	s->early_exporter_master_secret, hashlen,
581	1)) {
582	SSLfatal(s, SSL_AD_INTERNAL_ERROR,
583	SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
584	goto err;
585	}
586
587	if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
588	s->early_exporter_master_secret, hashlen)) {
589	/* SSLfatal() already called */
590	goto err;
591	}
592	} else if (which & SSL3_CC_HANDSHAKE) {
593	insecret = s->handshake_secret;
594	finsecret = s->client_finished_secret;
595	finsecretlen = EVP_MD_size(ssl_handshake_md(s));
596	label = client_handshake_traffic;
597	labellen = sizeof(client_handshake_traffic) - 1;
598	log_label = CLIENT_HANDSHAKE_LABEL;
599	/*
600	* The handshake hash used for the server read/client write handshake
601	* traffic secret is the same as the hash for the server
602	* write/client read handshake traffic secret. However, if we
603	* processed early data then we delay changing the server
604	* read/client write cipher state until later, and the handshake
605	* hashes have moved on. Therefore we use the value saved earlier
606	* when we did the server write/client read change cipher state.
607	*/
608	hash = s->handshake_traffic_hash;
609	} else {
610	insecret = s->master_secret;
611	label = client_application_traffic;
612	labellen = sizeof(client_application_traffic) - 1;
613	log_label = CLIENT_APPLICATION_LABEL;
614	/*
615	* For this we only use the handshake hashes up until the server
616	* Finished hash. We do not include the client's Finished, which is
617	* what ssl_handshake_hash() would give us. Instead we use the
618	* previously saved value.
619	*/
620	hash = s->server_finished_hash;
621	}
622	} else {
623	/* Early data never applies to client-read/server-write */
624	if (which & SSL3_CC_HANDSHAKE) {
625	insecret = s->handshake_secret;
626	finsecret = s->server_finished_secret;
627	finsecretlen = EVP_MD_size(ssl_handshake_md(s));
628	label = server_handshake_traffic;
629	labellen = sizeof(server_handshake_traffic) - 1;
630	log_label = SERVER_HANDSHAKE_LABEL;
631	} else {
632	insecret = s->master_secret;
633	label = server_application_traffic;
634	labellen = sizeof(server_application_traffic) - 1;
635	log_label = SERVER_APPLICATION_LABEL;
636	}
637	}
638
639	if (!(which & SSL3_CC_EARLY)) {
640	md = ssl_handshake_md(s);
641	cipher = s->s3->tmp.new_sym_enc;
642	if (!ssl3_digest_cached_records(s, 1)
643	\|\| !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
644	/* SSLfatal() already called */;
645	goto err;
646	}
647	}
648
649	/*
650	* Save the hash of handshakes up to now for use when we calculate the
651	* client application traffic secret
652	*/
653	if (label == server_application_traffic)
654	memcpy(s->server_finished_hash, hashval, hashlen);
655
656	if (label == server_handshake_traffic)
657	memcpy(s->handshake_traffic_hash, hashval, hashlen);
658
659	if (label == client_application_traffic) {
660	/*
661	* We also create the resumption master secret, but this time use the
662	* hash for the whole handshake including the Client Finished
663	*/
664	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
665	resumption_master_secret,
666	sizeof(resumption_master_secret) - 1,
667	hashval, hashlen, s->resumption_master_secret,
668	hashlen, 1)) {
669	/* SSLfatal() already called */
670	goto err;
671	}
672	}
673
674	if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
675	insecret, hash, label, labellen, secret, iv,
676	ciph_ctx)) {
677	/* SSLfatal() already called */
678	goto err;
679	}
680
681	if (label == server_application_traffic) {
682	memcpy(s->server_app_traffic_secret, secret, hashlen);
683	/* Now we create the exporter master secret */
684	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
685	exporter_master_secret,
686	sizeof(exporter_master_secret) - 1,
687	hash, hashlen, s->exporter_master_secret,
688	hashlen, 1)) {
689	/* SSLfatal() already called */
690	goto err;
691	}
692
693	if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
694	hashlen)) {
695	/* SSLfatal() already called */
696	goto err;
697	}
698	} else if (label == client_application_traffic)
699	memcpy(s->client_app_traffic_secret, secret, hashlen);
700
701	if (!ssl_log_secret(s, log_label, secret, hashlen)) {
702	/* SSLfatal() already called */
703	goto err;
704	}
705
706	if (finsecret != NULL
707	&& !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
708	finsecret, finsecretlen)) {
709	/* SSLfatal() already called */
710	goto err;
711	}
712
713	if (!s->server && label == client_early_traffic)
714	s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS;
715	else
716	s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
717	ret = 1;
718	err:
719	OPENSSL_cleanse(secret, sizeof(secret));
720	return ret;
721	}
722
723	int tls13_update_key(SSL *s, int sending)
724	{
725	#ifdef CHARSET_EBCDIC
726	static const unsigned char application_traffic[] = { 0x74, 0x72 ,0x61 ,0x66 ,0x66 ,0x69 ,0x63 ,0x20 ,0x75 ,0x70 ,0x64, 0x00};
727	#else
728	static const unsigned char application_traffic[] = "traffic upd";
729	#endif
730	const EVP_MD *md = ssl_handshake_md(s);
731	size_t hashlen = EVP_MD_size(md);
732	unsigned char insecret, iv;
733	unsigned char secret[EVP_MAX_MD_SIZE];
734	EVP_CIPHER_CTX *ciph_ctx;
735	int ret = 0;
736
737	if (s->server == sending)
738	insecret = s->server_app_traffic_secret;
739	else
740	insecret = s->client_app_traffic_secret;
741
742	if (sending) {
743	s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
744	iv = s->write_iv;
745	ciph_ctx = s->enc_write_ctx;
746	RECORD_LAYER_reset_write_sequence(&s->rlayer);
747	} else {
748	iv = s->read_iv;
749	ciph_ctx = s->enc_read_ctx;
750	RECORD_LAYER_reset_read_sequence(&s->rlayer);
751	}
752
753	if (!derive_secret_key_and_iv(s, sending, ssl_handshake_md(s),
754	s->s3->tmp.new_sym_enc, insecret, NULL,
755	application_traffic,
756	sizeof(application_traffic) - 1, secret, iv,
757	ciph_ctx)) {
758	/* SSLfatal() already called */
759	goto err;
760	}
761
762	memcpy(insecret, secret, hashlen);
763
764	s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
765	ret = 1;
766	err:
767	OPENSSL_cleanse(secret, sizeof(secret));
768	return ret;
769	}
770
771	int tls13_alert_code(int code)
772	{
773	/* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
774	if (code == SSL_AD_MISSING_EXTENSION \|\| code == SSL_AD_CERTIFICATE_REQUIRED)
775	return code;
776
777	return tls1_alert_code(code);
778	}
779
780	int tls13_export_keying_material(SSL s, unsigned char out, size_t olen,
781	const char *label, size_t llen,
782	const unsigned char *context,
783	size_t contextlen, int use_context)
784	{
785	unsigned char exportsecret[EVP_MAX_MD_SIZE];
786	#ifdef CHARSET_EBCDIC
787	static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
788	#else
789	static const unsigned char exporterlabel[] = "exporter";
790	#endif
791	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
792	const EVP_MD *md = ssl_handshake_md(s);
793	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
794	unsigned int hashsize, datalen;
795	int ret = 0;
796
797	if (ctx == NULL \|\| !ossl_statem_export_allowed(s))
798	goto err;
799
800	if (!use_context)
801	contextlen = 0;
802
803	if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
804	\|\| EVP_DigestUpdate(ctx, context, contextlen) <= 0
805	\|\| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
806	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
807	\|\| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
808	\|\| !tls13_hkdf_expand(s, md, s->exporter_master_secret,
809	(const unsigned char *)label, llen,
810	data, datalen, exportsecret, hashsize, 0)
811	\|\| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
812	sizeof(exporterlabel) - 1, hash, hashsize,
813	out, olen, 0))
814	goto err;
815
816	ret = 1;
817	err:
818	EVP_MD_CTX_free(ctx);
819	return ret;
820	}
821
822	int tls13_export_keying_material_early(SSL s, unsigned char out, size_t olen,
823	const char *label, size_t llen,
824	const unsigned char *context,
825	size_t contextlen)
826	{
827	#ifdef CHARSET_EBCDIC
828	static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
829	#else
830	static const unsigned char exporterlabel[] = "exporter";
831	#endif
832	unsigned char exportsecret[EVP_MAX_MD_SIZE];
833	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
834	const EVP_MD *md;
835	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
836	unsigned int hashsize, datalen;
837	int ret = 0;
838	const SSL_CIPHER *sslcipher;
839
840	if (ctx == NULL \|\| !ossl_statem_export_early_allowed(s))
841	goto err;
842
843	if (!s->server && s->max_early_data > 0
844	&& s->session->ext.max_early_data == 0)
845	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
846	else
847	sslcipher = SSL_SESSION_get0_cipher(s->session);
848
849	md = ssl_md(sslcipher->algorithm2);
850
851	/*
852	* Calculate the hash value and store it in \|data\|. The reason why
853	* the empty string is used is that the definition of TLS-Exporter
854	* is like so:
855	*
856	* TLS-Exporter(label, context_value, key_length) =
857	* HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
858	* "exporter", Hash(context_value), key_length)
859	*
860	* Derive-Secret(Secret, Label, Messages) =
861	* HKDF-Expand-Label(Secret, Label,
862	* Transcript-Hash(Messages), Hash.length)
863	*
864	* Here Transcript-Hash is the cipher suite hash algorithm.
865	*/
866	if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
867	\|\| EVP_DigestUpdate(ctx, context, contextlen) <= 0
868	\|\| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
869	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
870	\|\| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
871	\|\| !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
872	(const unsigned char *)label, llen,
873	data, datalen, exportsecret, hashsize, 0)
874	\|\| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
875	sizeof(exporterlabel) - 1, hash, hashsize,
876	out, olen, 0))
877	goto err;
878
879	ret = 1;
880	err:
881	EVP_MD_CTX_free(ctx);
882	return ret;
883	}

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source: vbox/trunk/src/libs/openssl-1.1.1k/ssl/tls13_enc.c@ 91527

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