tls13_enc.c@ 108453

最後變更在這個檔案從108453是 108206,由 vboxsync 提交於 4 週前
openssl-3.3.2: Exported all files to OSE and removed .scm-settings bugref:10757
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1	/*
2	* Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
3	*
4	* Licensed under the Apache License 2.0 (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/ktls.h"
13	#include "record/record_local.h"
14	#include "internal/cryptlib.h"
15	#include <openssl/evp.h>
16	#include <openssl/kdf.h>
17	#include <openssl/core_names.h>
18
19	#define TLS13_MAX_LABEL_LEN 249
20
21	/* ASCII: "tls13 ", in hex for EBCDIC compatibility */
22	static const unsigned char label_prefix[] = "\x74\x6C\x73\x31\x33\x20";
23
24	/*
25	* Given a \|secret\|; a \|label\| of length \|labellen\|; and \|data\| of length
26	* \|datalen\| (e.g. typically a hash of the handshake messages), derive a new
27	* secret \|outlen\| bytes long and store it in the location pointed to be \|out\|.
28	* The \|data\| value may be zero length. Any errors will be treated as fatal if
29	* \|fatal\| is set. Returns 1 on success 0 on failure.
30	* If \|raise_error\| is set, ERR_raise is called on failure.
31	*/
32	int tls13_hkdf_expand_ex(OSSL_LIB_CTX libctx, const char propq,
33	const EVP_MD *md,
34	const unsigned char *secret,
35	const unsigned char *label, size_t labellen,
36	const unsigned char *data, size_t datalen,
37	unsigned char *out, size_t outlen, int raise_error)
38	{
39	EVP_KDF *kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_TLS1_3_KDF, propq);
40	EVP_KDF_CTX *kctx;
41	OSSL_PARAM params[7], *p = params;
42	int mode = EVP_PKEY_HKDEF_MODE_EXPAND_ONLY;
43	const char *mdname = EVP_MD_get0_name(md);
44	int ret;
45	size_t hashlen;
46
47	kctx = EVP_KDF_CTX_new(kdf);
48	EVP_KDF_free(kdf);
49	if (kctx == NULL)
50	return 0;
51
52	if (labellen > TLS13_MAX_LABEL_LEN) {
53	if (raise_error)
54	/*
55	* Probably we have been called from SSL_export_keying_material(),
56	* or SSL_export_keying_material_early().
57	*/
58	ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
59
60	EVP_KDF_CTX_free(kctx);
61	return 0;
62	}
63
64	if ((ret = EVP_MD_get_size(md)) <= 0) {
65	EVP_KDF_CTX_free(kctx);
66	if (raise_error)
67	ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
68	return 0;
69	}
70	hashlen = (size_t)ret;
71
72	*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
73	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
74	(char *)mdname, 0);
75	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
76	(unsigned char *)secret, hashlen);
77	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX,
78	(unsigned char *)label_prefix,
79	sizeof(label_prefix) - 1);
80	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL,
81	(unsigned char *)label, labellen);
82	if (data != NULL)
83	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_DATA,
84	(unsigned char *)data,
85	datalen);
86	*p++ = OSSL_PARAM_construct_end();
87
88	ret = EVP_KDF_derive(kctx, out, outlen, params) <= 0;
89	EVP_KDF_CTX_free(kctx);
90
91	if (ret != 0) {
92	if (raise_error)
93	ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
94	}
95
96	return ret == 0;
97	}
98
99	int tls13_hkdf_expand(SSL_CONNECTION s, const EVP_MD md,
100	const unsigned char *secret,
101	const unsigned char *label, size_t labellen,
102	const unsigned char *data, size_t datalen,
103	unsigned char *out, size_t outlen, int fatal)
104	{
105	int ret;
106	SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
107
108	ret = tls13_hkdf_expand_ex(sctx->libctx, sctx->propq, md,
109	secret, label, labellen, data, datalen,
110	out, outlen, !fatal);
111	if (ret == 0 && fatal)
112	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
113
114	return ret;
115	}
116
117	/*
118	* Given a \|secret\| generate a \|key\| of length \|keylen\| bytes. Returns 1 on
119	* success 0 on failure.
120	*/
121	int tls13_derive_key(SSL_CONNECTION s, const EVP_MD md,
122	const unsigned char *secret,
123	unsigned char *key, size_t keylen)
124	{
125	/* ASCII: "key", in hex for EBCDIC compatibility */
126	static const unsigned char keylabel[] = "\x6B\x65\x79";
127
128	return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
129	NULL, 0, key, keylen, 1);
130	}
131
132	/*
133	* Given a \|secret\| generate an \|iv\| of length \|ivlen\| bytes. Returns 1 on
134	* success 0 on failure.
135	*/
136	int tls13_derive_iv(SSL_CONNECTION s, const EVP_MD md,
137	const unsigned char *secret,
138	unsigned char *iv, size_t ivlen)
139	{
140	/* ASCII: "iv", in hex for EBCDIC compatibility */
141	static const unsigned char ivlabel[] = "\x69\x76";
142
143	return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
144	NULL, 0, iv, ivlen, 1);
145	}
146
147	int tls13_derive_finishedkey(SSL_CONNECTION s, const EVP_MD md,
148	const unsigned char *secret,
149	unsigned char *fin, size_t finlen)
150	{
151	/* ASCII: "finished", in hex for EBCDIC compatibility */
152	static const unsigned char finishedlabel[] = "\x66\x69\x6E\x69\x73\x68\x65\x64";
153
154	return tls13_hkdf_expand(s, md, secret, finishedlabel,
155	sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
156	}
157
158	/*
159	* Given the previous secret \|prevsecret\| and a new input secret \|insecret\| of
160	* length \|insecretlen\|, generate a new secret and store it in the location
161	* pointed to by \|outsecret\|. Returns 1 on success 0 on failure.
162	*/
163	int tls13_generate_secret(SSL_CONNECTION s, const EVP_MD md,
164	const unsigned char *prevsecret,
165	const unsigned char *insecret,
166	size_t insecretlen,
167	unsigned char *outsecret)
168	{
169	size_t mdlen;
170	int mdleni;
171	int ret;
172	EVP_KDF *kdf;
173	EVP_KDF_CTX *kctx;
174	OSSL_PARAM params[7], *p = params;
175	int mode = EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY;
176	const char *mdname = EVP_MD_get0_name(md);
177	/* ASCII: "derived", in hex for EBCDIC compatibility */
178	static const char derived_secret_label[] = "\x64\x65\x72\x69\x76\x65\x64";
179	SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
180
181	kdf = EVP_KDF_fetch(sctx->libctx, OSSL_KDF_NAME_TLS1_3_KDF, sctx->propq);
182	kctx = EVP_KDF_CTX_new(kdf);
183	EVP_KDF_free(kdf);
184	if (kctx == NULL) {
185	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
186	return 0;
187	}
188
189	mdleni = EVP_MD_get_size(md);
190	/* Ensure cast to size_t is safe */
191	if (!ossl_assert(mdleni >= 0)) {
192	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
193	EVP_KDF_CTX_free(kctx);
194	return 0;
195	}
196	mdlen = (size_t)mdleni;
197
198	*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
199	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
200	(char *)mdname, 0);
201	if (insecret != NULL)
202	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
203	(unsigned char *)insecret,
204	insecretlen);
205	if (prevsecret != NULL)
206	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
207	(unsigned char *)prevsecret, mdlen);
208	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX,
209	(unsigned char *)label_prefix,
210	sizeof(label_prefix) - 1);
211	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL,
212	(unsigned char *)derived_secret_label,
213	sizeof(derived_secret_label) - 1);
214	*p++ = OSSL_PARAM_construct_end();
215
216	ret = EVP_KDF_derive(kctx, outsecret, mdlen, params) <= 0;
217
218	if (ret != 0)
219	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
220
221	EVP_KDF_CTX_free(kctx);
222	return ret == 0;
223	}
224
225	/*
226	* Given an input secret \|insecret\| of length \|insecretlen\| generate the
227	* handshake secret. This requires the early secret to already have been
228	* generated. Returns 1 on success 0 on failure.
229	*/
230	int tls13_generate_handshake_secret(SSL_CONNECTION *s,
231	const unsigned char *insecret,
232	size_t insecretlen)
233	{
234	/* Calls SSLfatal() if required */
235	return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
236	insecret, insecretlen,
237	(unsigned char *)&s->handshake_secret);
238	}
239
240	/*
241	* Given the handshake secret \|prev\| of length \|prevlen\| generate the master
242	* secret and store its length in \|*secret_size\|. Returns 1 on success 0 on
243	* failure.
244	*/
245	int tls13_generate_master_secret(SSL_CONNECTION s, unsigned char out,
246	unsigned char *prev, size_t prevlen,
247	size_t *secret_size)
248	{
249	const EVP_MD *md = ssl_handshake_md(s);
250
251	*secret_size = EVP_MD_get_size(md);
252	/* Calls SSLfatal() if required */
253	return tls13_generate_secret(s, md, prev, NULL, 0, out);
254	}
255
256	/*
257	* Generates the mac for the Finished message. Returns the length of the MAC or
258	* 0 on error.
259	*/
260	size_t tls13_final_finish_mac(SSL_CONNECTION s, const char str, size_t slen,
261	unsigned char *out)
262	{
263	const EVP_MD *md = ssl_handshake_md(s);
264	const char *mdname = EVP_MD_get0_name(md);
265	unsigned char hash[EVP_MAX_MD_SIZE];
266	unsigned char finsecret[EVP_MAX_MD_SIZE];
267	unsigned char *key = NULL;
268	size_t len = 0, hashlen;
269	OSSL_PARAM params[2], *p = params;
270	SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
271
272	if (md == NULL)
273	return 0;
274
275	/* Safe to cast away const here since we're not "getting" any data */
276	if (sctx->propq != NULL)
277	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES,
278	(char *)sctx->propq,
279	0);
280	*p = OSSL_PARAM_construct_end();
281
282	if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
283	/* SSLfatal() already called */
284	goto err;
285	}
286
287	if (str == SSL_CONNECTION_GET_SSL(s)->method->ssl3_enc->server_finished_label) {
288	key = s->server_finished_secret;
289	} else if (SSL_IS_FIRST_HANDSHAKE(s)) {
290	key = s->client_finished_secret;
291	} else {
292	if (!tls13_derive_finishedkey(s, md,
293	s->client_app_traffic_secret,
294	finsecret, hashlen))
295	goto err;
296	key = finsecret;
297	}
298
299	if (!EVP_Q_mac(sctx->libctx, "HMAC", sctx->propq, mdname,
300	params, key, hashlen, hash, hashlen,
301	/* outsize as per sizeof(peer_finish_md) */
302	out, EVP_MAX_MD_SIZE * 2, &len)) {
303	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
304	goto err;
305	}
306
307	err:
308	OPENSSL_cleanse(finsecret, sizeof(finsecret));
309	return len;
310	}
311
312	/*
313	* There isn't really a key block in TLSv1.3, but we still need this function
314	* for initialising the cipher and hash. Returns 1 on success or 0 on failure.
315	*/
316	int tls13_setup_key_block(SSL_CONNECTION *s)
317	{
318	const EVP_CIPHER *c;
319	const EVP_MD *hash;
320
321	s->session->cipher = s->s3.tmp.new_cipher;
322	if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
323	NULL, NULL, NULL, 0)) {
324	/* Error is already recorded */
325	SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
326	return 0;
327	}
328
329	ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
330	s->s3.tmp.new_sym_enc = c;
331	ssl_evp_md_free(s->s3.tmp.new_hash);
332	s->s3.tmp.new_hash = hash;
333
334	return 1;
335	}
336
337	static int derive_secret_key_and_iv(SSL_CONNECTION s, const EVP_MD md,
338	const EVP_CIPHER *ciph,
339	const unsigned char *insecret,
340	const unsigned char *hash,
341	const unsigned char *label,
342	size_t labellen, unsigned char *secret,
343	unsigned char key, size_t keylen,
344	unsigned char iv, size_t ivlen,
345	size_t *taglen)
346	{
347	int hashleni = EVP_MD_get_size(md);
348	size_t hashlen;
349	int mode;
350
351	/* Ensure cast to size_t is safe */
352	if (!ossl_assert(hashleni >= 0)) {
353	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
354	return 0;
355	}
356	hashlen = (size_t)hashleni;
357
358	if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
359	secret, hashlen, 1)) {
360	/* SSLfatal() already called */
361	return 0;
362	}
363
364	*keylen = EVP_CIPHER_get_key_length(ciph);
365
366	mode = EVP_CIPHER_get_mode(ciph);
367	if (mode == EVP_CIPH_CCM_MODE) {
368	uint32_t algenc;
369
370	*ivlen = EVP_CCM_TLS_IV_LEN;
371	if (s->s3.tmp.new_cipher != NULL) {
372	algenc = s->s3.tmp.new_cipher->algorithm_enc;
373	} else if (s->session->cipher != NULL) {
374	/* We've not selected a cipher yet - we must be doing early data */
375	algenc = s->session->cipher->algorithm_enc;
376	} else if (s->psksession != NULL && s->psksession->cipher != NULL) {
377	/* We must be doing early data with out-of-band PSK */
378	algenc = s->psksession->cipher->algorithm_enc;
379	} else {
380	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
381	return 0;
382	}
383	if (algenc & (SSL_AES128CCM8 \| SSL_AES256CCM8))
384	*taglen = EVP_CCM8_TLS_TAG_LEN;
385	else
386	*taglen = EVP_CCM_TLS_TAG_LEN;
387	} else {
388	int iivlen;
389
390	if (mode == EVP_CIPH_GCM_MODE) {
391	*taglen = EVP_GCM_TLS_TAG_LEN;
392	} else {
393	/* CHACHA20P-POLY1305 */
394	*taglen = EVP_CHACHAPOLY_TLS_TAG_LEN;
395	}
396	iivlen = EVP_CIPHER_get_iv_length(ciph);
397	if (iivlen < 0) {
398	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
399	return 0;
400	}
401	*ivlen = iivlen;
402	}
403
404	if (!tls13_derive_key(s, md, secret, key, *keylen)
405	\|\| !tls13_derive_iv(s, md, secret, iv, *ivlen)) {
406	/* SSLfatal() already called */
407	return 0;
408	}
409
410	return 1;
411	}
412
413	int tls13_change_cipher_state(SSL_CONNECTION *s, int which)
414	{
415	/* ASCII: "c e traffic", in hex for EBCDIC compatibility */
416	static const unsigned char client_early_traffic[] = "\x63\x20\x65\x20\x74\x72\x61\x66\x66\x69\x63";
417	/* ASCII: "c hs traffic", in hex for EBCDIC compatibility */
418	static const unsigned char client_handshake_traffic[] = "\x63\x20\x68\x73\x20\x74\x72\x61\x66\x66\x69\x63";
419	/* ASCII: "c ap traffic", in hex for EBCDIC compatibility */
420	static const unsigned char client_application_traffic[] = "\x63\x20\x61\x70\x20\x74\x72\x61\x66\x66\x69\x63";
421	/* ASCII: "s hs traffic", in hex for EBCDIC compatibility */
422	static const unsigned char server_handshake_traffic[] = "\x73\x20\x68\x73\x20\x74\x72\x61\x66\x66\x69\x63";
423	/* ASCII: "s ap traffic", in hex for EBCDIC compatibility */
424	static const unsigned char server_application_traffic[] = "\x73\x20\x61\x70\x20\x74\x72\x61\x66\x66\x69\x63";
425	/* ASCII: "exp master", in hex for EBCDIC compatibility */
426	static const unsigned char exporter_master_secret[] = "\x65\x78\x70\x20\x6D\x61\x73\x74\x65\x72";
427	/* ASCII: "res master", in hex for EBCDIC compatibility */
428	static const unsigned char resumption_master_secret[] = "\x72\x65\x73\x20\x6D\x61\x73\x74\x65\x72";
429	/* ASCII: "e exp master", in hex for EBCDIC compatibility */
430	static const unsigned char early_exporter_master_secret[] = "\x65\x20\x65\x78\x70\x20\x6D\x61\x73\x74\x65\x72";
431	unsigned char iv[EVP_MAX_IV_LENGTH];
432	unsigned char key[EVP_MAX_KEY_LENGTH];
433	unsigned char secret[EVP_MAX_MD_SIZE];
434	unsigned char hashval[EVP_MAX_MD_SIZE];
435	unsigned char *hash = hashval;
436	unsigned char *insecret;
437	unsigned char *finsecret = NULL;
438	const char *log_label = NULL;
439	size_t finsecretlen = 0;
440	const unsigned char *label;
441	size_t labellen, hashlen = 0;
442	int ret = 0;
443	const EVP_MD *md = NULL;
444	const EVP_CIPHER *cipher = NULL;
445	SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
446	size_t keylen, ivlen, taglen;
447	int level;
448	int direction = (which & SSL3_CC_READ) != 0 ? OSSL_RECORD_DIRECTION_READ
449	: OSSL_RECORD_DIRECTION_WRITE;
450
451	if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
452	\|\| ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
453	if (which & SSL3_CC_EARLY) {
454	EVP_MD_CTX *mdctx = NULL;
455	long handlen;
456	void *hdata;
457	unsigned int hashlenui;
458	const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
459
460	insecret = s->early_secret;
461	label = client_early_traffic;
462	labellen = sizeof(client_early_traffic) - 1;
463	log_label = CLIENT_EARLY_LABEL;
464
465	handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
466	if (handlen <= 0) {
467	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
468	goto err;
469	}
470
471	if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
472	&& s->max_early_data > 0
473	&& s->session->ext.max_early_data == 0) {
474	/*
475	* If we are attempting to send early data, and we've decided to
476	* actually do it but max_early_data in s->session is 0 then we
477	* must be using an external PSK.
478	*/
479	if (!ossl_assert(s->psksession != NULL
480	&& s->max_early_data ==
481	s->psksession->ext.max_early_data)) {
482	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
483	goto err;
484	}
485	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
486	}
487	if (sslcipher == NULL) {
488	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_PSK);
489	goto err;
490	}
491
492	/*
493	* We need to calculate the handshake digest using the digest from
494	* the session. We haven't yet selected our ciphersuite so we can't
495	* use ssl_handshake_md().
496	*/
497	mdctx = EVP_MD_CTX_new();
498	if (mdctx == NULL) {
499	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
500	goto err;
501	}
502
503	/*
504	* This ups the ref count on cipher so we better make sure we free
505	* it again
506	*/
507	if (!ssl_cipher_get_evp_cipher(sctx, sslcipher, &cipher)) {
508	/* Error is already recorded */
509	SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
510	EVP_MD_CTX_free(mdctx);
511	goto err;
512	}
513
514	md = ssl_md(sctx, sslcipher->algorithm2);
515	if (md == NULL \|\| !EVP_DigestInit_ex(mdctx, md, NULL)
516	\|\| !EVP_DigestUpdate(mdctx, hdata, handlen)
517	\|\| !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
518	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
519	EVP_MD_CTX_free(mdctx);
520	goto err;
521	}
522	hashlen = hashlenui;
523	EVP_MD_CTX_free(mdctx);
524
525	if (!tls13_hkdf_expand(s, md, insecret,
526	early_exporter_master_secret,
527	sizeof(early_exporter_master_secret) - 1,
528	hashval, hashlen,
529	s->early_exporter_master_secret, hashlen,
530	1)) {
531	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
532	goto err;
533	}
534
535	if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
536	s->early_exporter_master_secret, hashlen)) {
537	/* SSLfatal() already called */
538	goto err;
539	}
540	} else if (which & SSL3_CC_HANDSHAKE) {
541	insecret = s->handshake_secret;
542	finsecret = s->client_finished_secret;
543	finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
544	label = client_handshake_traffic;
545	labellen = sizeof(client_handshake_traffic) - 1;
546	log_label = CLIENT_HANDSHAKE_LABEL;
547	/*
548	* The handshake hash used for the server read/client write handshake
549	* traffic secret is the same as the hash for the server
550	* write/client read handshake traffic secret. However, if we
551	* processed early data then we delay changing the server
552	* read/client write cipher state until later, and the handshake
553	* hashes have moved on. Therefore we use the value saved earlier
554	* when we did the server write/client read change cipher state.
555	*/
556	hash = s->handshake_traffic_hash;
557	} else {
558	insecret = s->master_secret;
559	label = client_application_traffic;
560	labellen = sizeof(client_application_traffic) - 1;
561	log_label = CLIENT_APPLICATION_LABEL;
562	/*
563	* For this we only use the handshake hashes up until the server
564	* Finished hash. We do not include the client's Finished, which is
565	* what ssl_handshake_hash() would give us. Instead we use the
566	* previously saved value.
567	*/
568	hash = s->server_finished_hash;
569	}
570	} else {
571	/* Early data never applies to client-read/server-write */
572	if (which & SSL3_CC_HANDSHAKE) {
573	insecret = s->handshake_secret;
574	finsecret = s->server_finished_secret;
575	finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
576	label = server_handshake_traffic;
577	labellen = sizeof(server_handshake_traffic) - 1;
578	log_label = SERVER_HANDSHAKE_LABEL;
579	} else {
580	insecret = s->master_secret;
581	label = server_application_traffic;
582	labellen = sizeof(server_application_traffic) - 1;
583	log_label = SERVER_APPLICATION_LABEL;
584	}
585	}
586
587	if (!(which & SSL3_CC_EARLY)) {
588	md = ssl_handshake_md(s);
589	cipher = s->s3.tmp.new_sym_enc;
590	if (!ssl3_digest_cached_records(s, 1)
591	\|\| !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
592	/* SSLfatal() already called */;
593	goto err;
594	}
595	}
596
597	/*
598	* Save the hash of handshakes up to now for use when we calculate the
599	* client application traffic secret
600	*/
601	if (label == server_application_traffic)
602	memcpy(s->server_finished_hash, hashval, hashlen);
603
604	if (label == server_handshake_traffic)
605	memcpy(s->handshake_traffic_hash, hashval, hashlen);
606
607	if (label == client_application_traffic) {
608	/*
609	* We also create the resumption master secret, but this time use the
610	* hash for the whole handshake including the Client Finished
611	*/
612	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
613	resumption_master_secret,
614	sizeof(resumption_master_secret) - 1,
615	hashval, hashlen, s->resumption_master_secret,
616	hashlen, 1)) {
617	/* SSLfatal() already called */
618	goto err;
619	}
620	}
621
622	/* check whether cipher is known */
623	if (!ossl_assert(cipher != NULL))
624	goto err;
625
626	if (!derive_secret_key_and_iv(s, md, cipher,
627	insecret, hash, label, labellen, secret, key,
628	&keylen, iv, &ivlen, &taglen)) {
629	/* SSLfatal() already called */
630	goto err;
631	}
632
633	if (label == server_application_traffic) {
634	memcpy(s->server_app_traffic_secret, secret, hashlen);
635	/* Now we create the exporter master secret */
636	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
637	exporter_master_secret,
638	sizeof(exporter_master_secret) - 1,
639	hash, hashlen, s->exporter_master_secret,
640	hashlen, 1)) {
641	/* SSLfatal() already called */
642	goto err;
643	}
644
645	if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
646	hashlen)) {
647	/* SSLfatal() already called */
648	goto err;
649	}
650	} else if (label == client_application_traffic)
651	memcpy(s->client_app_traffic_secret, secret, hashlen);
652
653	if (!ssl_log_secret(s, log_label, secret, hashlen)) {
654	/* SSLfatal() already called */
655	goto err;
656	}
657
658	if (finsecret != NULL
659	&& !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
660	finsecret, finsecretlen)) {
661	/* SSLfatal() already called */
662	goto err;
663	}
664
665	if ((which & SSL3_CC_WRITE) != 0) {
666	if (!s->server && label == client_early_traffic)
667	s->rlayer.wrlmethod->set_plain_alerts(s->rlayer.wrl, 1);
668	else
669	s->rlayer.wrlmethod->set_plain_alerts(s->rlayer.wrl, 0);
670	}
671
672	level = (which & SSL3_CC_EARLY) != 0
673	? OSSL_RECORD_PROTECTION_LEVEL_EARLY
674	: ((which &SSL3_CC_HANDSHAKE) != 0
675	? OSSL_RECORD_PROTECTION_LEVEL_HANDSHAKE
676	: OSSL_RECORD_PROTECTION_LEVEL_APPLICATION);
677
678	if (!ssl_set_new_record_layer(s, s->version,
679	direction,
680	level, secret, hashlen, key, keylen, iv,
681	ivlen, NULL, 0, cipher, taglen, NID_undef,
682	NULL, NULL, md)) {
683	/* SSLfatal already called */
684	goto err;
685	}
686
687	ret = 1;
688	err:
689	if ((which & SSL3_CC_EARLY) != 0) {
690	/* We up-refed this so now we need to down ref */
691	ssl_evp_cipher_free(cipher);
692	}
693	OPENSSL_cleanse(key, sizeof(key));
694	OPENSSL_cleanse(secret, sizeof(secret));
695	return ret;
696	}
697
698	int tls13_update_key(SSL_CONNECTION *s, int sending)
699	{
700	/* ASCII: "traffic upd", in hex for EBCDIC compatibility */
701	static const unsigned char application_traffic[] = "\x74\x72\x61\x66\x66\x69\x63\x20\x75\x70\x64";
702	const EVP_MD *md = ssl_handshake_md(s);
703	size_t hashlen;
704	unsigned char key[EVP_MAX_KEY_LENGTH];
705	unsigned char *insecret;
706	unsigned char secret[EVP_MAX_MD_SIZE];
707	char *log_label;
708	size_t keylen, ivlen, taglen;
709	int ret = 0, l;
710	int direction = sending ? OSSL_RECORD_DIRECTION_WRITE
711	: OSSL_RECORD_DIRECTION_READ;
712	unsigned char iv[EVP_MAX_IV_LENGTH];
713
714	if ((l = EVP_MD_get_size(md)) <= 0) {
715	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
716	return 0;
717	}
718	hashlen = (size_t)l;
719
720	if (s->server == sending)
721	insecret = s->server_app_traffic_secret;
722	else
723	insecret = s->client_app_traffic_secret;
724
725	if (!derive_secret_key_and_iv(s, md,
726	s->s3.tmp.new_sym_enc, insecret, NULL,
727	application_traffic,
728	sizeof(application_traffic) - 1, secret, key,
729	&keylen, iv, &ivlen, &taglen)) {
730	/* SSLfatal() already called */
731	goto err;
732	}
733
734	memcpy(insecret, secret, hashlen);
735
736	if (!ssl_set_new_record_layer(s, s->version,
737	direction,
738	OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
739	insecret, hashlen, key, keylen, iv, ivlen, NULL, 0,
740	s->s3.tmp.new_sym_enc, taglen, NID_undef, NULL,
741	NULL, md)) {
742	/* SSLfatal already called */
743	goto err;
744	}
745
746	/* Call Key log on successful traffic secret update */
747	log_label = s->server == sending ? SERVER_APPLICATION_N_LABEL : CLIENT_APPLICATION_N_LABEL;
748	if (!ssl_log_secret(s, log_label, secret, hashlen)) {
749	/* SSLfatal() already called */
750	goto err;
751	}
752	ret = 1;
753	err:
754	OPENSSL_cleanse(key, sizeof(key));
755	OPENSSL_cleanse(secret, sizeof(secret));
756	return ret;
757	}
758
759	int tls13_alert_code(int code)
760	{
761	/* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
762	if (code == SSL_AD_MISSING_EXTENSION \|\| code == SSL_AD_CERTIFICATE_REQUIRED)
763	return code;
764
765	return tls1_alert_code(code);
766	}
767
768	int tls13_export_keying_material(SSL_CONNECTION *s,
769	unsigned char *out, size_t olen,
770	const char *label, size_t llen,
771	const unsigned char *context,
772	size_t contextlen, int use_context)
773	{
774	unsigned char exportsecret[EVP_MAX_MD_SIZE];
775	/* ASCII: "exporter", in hex for EBCDIC compatibility */
776	static const unsigned char exporterlabel[] = "\x65\x78\x70\x6F\x72\x74\x65\x72";
777	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
778	const EVP_MD *md = ssl_handshake_md(s);
779	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
780	unsigned int hashsize, datalen;
781	int ret = 0;
782
783	if (ctx == NULL \|\| md == NULL \|\| !ossl_statem_export_allowed(s))
784	goto err;
785
786	if (!use_context)
787	contextlen = 0;
788
789	if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
790	\|\| EVP_DigestUpdate(ctx, context, contextlen) <= 0
791	\|\| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
792	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
793	\|\| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
794	\|\| !tls13_hkdf_expand(s, md, s->exporter_master_secret,
795	(const unsigned char *)label, llen,
796	data, datalen, exportsecret, hashsize, 0)
797	\|\| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
798	sizeof(exporterlabel) - 1, hash, hashsize,
799	out, olen, 0))
800	goto err;
801
802	ret = 1;
803	err:
804	EVP_MD_CTX_free(ctx);
805	return ret;
806	}
807
808	int tls13_export_keying_material_early(SSL_CONNECTION *s,
809	unsigned char *out, size_t olen,
810	const char *label, size_t llen,
811	const unsigned char *context,
812	size_t contextlen)
813	{
814	/* ASCII: "exporter", in hex for EBCDIC compatibility */
815	static const unsigned char exporterlabel[] = "\x65\x78\x70\x6F\x72\x74\x65\x72";
816	unsigned char exportsecret[EVP_MAX_MD_SIZE];
817	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
818	const EVP_MD *md;
819	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
820	unsigned int hashsize, datalen;
821	int ret = 0;
822	const SSL_CIPHER *sslcipher;
823
824	if (ctx == NULL \|\| !ossl_statem_export_early_allowed(s))
825	goto err;
826
827	if (!s->server && s->max_early_data > 0
828	&& s->session->ext.max_early_data == 0)
829	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
830	else
831	sslcipher = SSL_SESSION_get0_cipher(s->session);
832
833	md = ssl_md(SSL_CONNECTION_GET_CTX(s), sslcipher->algorithm2);
834
835	/*
836	* Calculate the hash value and store it in \|data\|. The reason why
837	* the empty string is used is that the definition of TLS-Exporter
838	* is like so:
839	*
840	* TLS-Exporter(label, context_value, key_length) =
841	* HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
842	* "exporter", Hash(context_value), key_length)
843	*
844	* Derive-Secret(Secret, Label, Messages) =
845	* HKDF-Expand-Label(Secret, Label,
846	* Transcript-Hash(Messages), Hash.length)
847	*
848	* Here Transcript-Hash is the cipher suite hash algorithm.
849	*/
850	if (md == NULL
851	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
852	\|\| EVP_DigestUpdate(ctx, context, contextlen) <= 0
853	\|\| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
854	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
855	\|\| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
856	\|\| !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
857	(const unsigned char *)label, llen,
858	data, datalen, exportsecret, hashsize, 0)
859	\|\| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
860	sizeof(exporterlabel) - 1, hash, hashsize,
861	out, olen, 0))
862	goto err;
863
864	ret = 1;
865	err:
866	EVP_MD_CTX_free(ctx);
867	return ret;
868	}

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