tls13_enc.c@ 109302

Last change on this file since 109302 was 109052, checked in by vboxsync, 4 weeks ago
openssl-3.4.1: Applied our changes, regenerated files, added missing files and functions. This time with a three way merge. bugref:10890
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1	/*
2	* Copyright 2016-2024 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	int md_size;
251
252	md_size = EVP_MD_get_size(md);
253	if (md_size <= 0) {
254	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
255	return 0;
256	}
257	*secret_size = (size_t)md_size;
258	/* Calls SSLfatal() if required */
259	return tls13_generate_secret(s, md, prev, NULL, 0, out);
260	}
261
262	/*
263	* Generates the mac for the Finished message. Returns the length of the MAC or
264	* 0 on error.
265	*/
266	size_t tls13_final_finish_mac(SSL_CONNECTION s, const char str, size_t slen,
267	unsigned char *out)
268	{
269	const EVP_MD *md = ssl_handshake_md(s);
270	const char *mdname = EVP_MD_get0_name(md);
271	unsigned char hash[EVP_MAX_MD_SIZE];
272	unsigned char finsecret[EVP_MAX_MD_SIZE];
273	unsigned char *key = NULL;
274	size_t len = 0, hashlen;
275	OSSL_PARAM params[2], *p = params;
276	SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
277
278	if (md == NULL)
279	return 0;
280
281	/* Safe to cast away const here since we're not "getting" any data */
282	if (sctx->propq != NULL)
283	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES,
284	(char *)sctx->propq,
285	0);
286	*p = OSSL_PARAM_construct_end();
287
288	if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
289	/* SSLfatal() already called */
290	goto err;
291	}
292
293	if (str == SSL_CONNECTION_GET_SSL(s)->method->ssl3_enc->server_finished_label) {
294	key = s->server_finished_secret;
295	} else if (SSL_IS_FIRST_HANDSHAKE(s)) {
296	key = s->client_finished_secret;
297	} else {
298	if (!tls13_derive_finishedkey(s, md,
299	s->client_app_traffic_secret,
300	finsecret, hashlen))
301	goto err;
302	key = finsecret;
303	}
304
305	if (!EVP_Q_mac(sctx->libctx, "HMAC", sctx->propq, mdname,
306	params, key, hashlen, hash, hashlen,
307	/* outsize as per sizeof(peer_finish_md) */
308	out, EVP_MAX_MD_SIZE * 2, &len)) {
309	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
310	goto err;
311	}
312
313	err:
314	OPENSSL_cleanse(finsecret, sizeof(finsecret));
315	return len;
316	}
317
318	/*
319	* There isn't really a key block in TLSv1.3, but we still need this function
320	* for initialising the cipher and hash. Returns 1 on success or 0 on failure.
321	*/
322	int tls13_setup_key_block(SSL_CONNECTION *s)
323	{
324	const EVP_CIPHER *c;
325	const EVP_MD *hash;
326	int mac_type = NID_undef;
327	size_t mac_secret_size = 0;
328
329	s->session->cipher = s->s3.tmp.new_cipher;
330	if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
331	&mac_type, &mac_secret_size, NULL, 0)) {
332	/* Error is already recorded */
333	SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
334	return 0;
335	}
336
337	ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
338	s->s3.tmp.new_sym_enc = c;
339	ssl_evp_md_free(s->s3.tmp.new_hash);
340	s->s3.tmp.new_hash = hash;
341	s->s3.tmp.new_mac_pkey_type = mac_type;
342	s->s3.tmp.new_mac_secret_size = mac_secret_size;
343
344	return 1;
345	}
346
347	static int derive_secret_key_and_iv(SSL_CONNECTION s, const EVP_MD md,
348	const EVP_CIPHER *ciph,
349	int mac_type,
350	const EVP_MD *mac_md,
351	const unsigned char *insecret,
352	const unsigned char *hash,
353	const unsigned char *label,
354	size_t labellen, unsigned char *secret,
355	unsigned char key, size_t keylen,
356	unsigned char *iv, size_t ivlen,
357	size_t *taglen)
358	{
359	int hashleni = EVP_MD_get_size(md);
360	size_t hashlen;
361	int mode, mac_mdleni;
362
363	/* Ensure cast to size_t is safe */
364	if (!ossl_assert(hashleni > 0)) {
365	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
366	return 0;
367	}
368	hashlen = (size_t)hashleni;
369
370	if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
371	secret, hashlen, 1)) {
372	/* SSLfatal() already called */
373	return 0;
374	}
375
376	/* if ciph is NULL cipher, then use new_hash to calculate keylen */
377	if (EVP_CIPHER_is_a(ciph, "NULL")
378	&& mac_md != NULL
379	&& mac_type == NID_hmac) {
380	mac_mdleni = EVP_MD_get_size(mac_md);
381
382	if (mac_mdleni <= 0) {
383	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
384	return 0;
385	}
386	ivlen = taglen = (size_t)mac_mdleni;
387	*keylen = s->s3.tmp.new_mac_secret_size;
388	} else {
389
390	*keylen = EVP_CIPHER_get_key_length(ciph);
391
392	mode = EVP_CIPHER_get_mode(ciph);
393	if (mode == EVP_CIPH_CCM_MODE) {
394	uint32_t algenc;
395
396	*ivlen = EVP_CCM_TLS_IV_LEN;
397	if (s->s3.tmp.new_cipher != NULL) {
398	algenc = s->s3.tmp.new_cipher->algorithm_enc;
399	} else if (s->session->cipher != NULL) {
400	/* We've not selected a cipher yet - we must be doing early data */
401	algenc = s->session->cipher->algorithm_enc;
402	} else if (s->psksession != NULL && s->psksession->cipher != NULL) {
403	/* We must be doing early data with out-of-band PSK */
404	algenc = s->psksession->cipher->algorithm_enc;
405	} else {
406	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
407	return 0;
408	}
409	if (algenc & (SSL_AES128CCM8 \| SSL_AES256CCM8))
410	*taglen = EVP_CCM8_TLS_TAG_LEN;
411	else
412	*taglen = EVP_CCM_TLS_TAG_LEN;
413	} else {
414	int iivlen;
415
416	if (mode == EVP_CIPH_GCM_MODE) {
417	*taglen = EVP_GCM_TLS_TAG_LEN;
418	} else {
419	/* CHACHA20P-POLY1305 */
420	*taglen = EVP_CHACHAPOLY_TLS_TAG_LEN;
421	}
422	iivlen = EVP_CIPHER_get_iv_length(ciph);
423	if (iivlen < 0) {
424	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
425	return 0;
426	}
427	*ivlen = iivlen;
428	}
429	}
430
431	if (*ivlen > EVP_MAX_IV_LENGTH) {
432	iv = OPENSSL_malloc(ivlen);
433	if (*iv == NULL) {
434	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
435	return 0;
436	}
437	}
438
439	if (!tls13_derive_key(s, md, secret, key, *keylen)
440	\|\| !tls13_derive_iv(s, md, secret, iv, ivlen)) {
441	/* SSLfatal() already called */
442	return 0;
443	}
444
445	return 1;
446	}
447
448	int tls13_change_cipher_state(SSL_CONNECTION *s, int which)
449	{
450	/* ASCII: "c e traffic", in hex for EBCDIC compatibility */
451	static const unsigned char client_early_traffic[] = "\x63\x20\x65\x20\x74\x72\x61\x66\x66\x69\x63";
452	/* ASCII: "c hs traffic", in hex for EBCDIC compatibility */
453	static const unsigned char client_handshake_traffic[] = "\x63\x20\x68\x73\x20\x74\x72\x61\x66\x66\x69\x63";
454	/* ASCII: "c ap traffic", in hex for EBCDIC compatibility */
455	static const unsigned char client_application_traffic[] = "\x63\x20\x61\x70\x20\x74\x72\x61\x66\x66\x69\x63";
456	/* ASCII: "s hs traffic", in hex for EBCDIC compatibility */
457	static const unsigned char server_handshake_traffic[] = "\x73\x20\x68\x73\x20\x74\x72\x61\x66\x66\x69\x63";
458	/* ASCII: "s ap traffic", in hex for EBCDIC compatibility */
459	static const unsigned char server_application_traffic[] = "\x73\x20\x61\x70\x20\x74\x72\x61\x66\x66\x69\x63";
460	/* ASCII: "exp master", in hex for EBCDIC compatibility */
461	static const unsigned char exporter_master_secret[] = "\x65\x78\x70\x20\x6D\x61\x73\x74\x65\x72";
462	/* ASCII: "res master", in hex for EBCDIC compatibility */
463	static const unsigned char resumption_master_secret[] = "\x72\x65\x73\x20\x6D\x61\x73\x74\x65\x72";
464	/* ASCII: "e exp master", in hex for EBCDIC compatibility */
465	static const unsigned char early_exporter_master_secret[] = "\x65\x20\x65\x78\x70\x20\x6D\x61\x73\x74\x65\x72";
466	unsigned char iv_intern[EVP_MAX_IV_LENGTH];
467	unsigned char *iv = iv_intern;
468	unsigned char key[EVP_MAX_KEY_LENGTH];
469	unsigned char secret[EVP_MAX_MD_SIZE];
470	unsigned char hashval[EVP_MAX_MD_SIZE];
471	unsigned char *hash = hashval;
472	unsigned char *insecret;
473	unsigned char *finsecret = NULL;
474	const char *log_label = NULL;
475	int finsecretlen = 0;
476	const unsigned char *label;
477	size_t labellen, hashlen = 0;
478	int ret = 0;
479	const EVP_MD md = NULL, mac_md = NULL;
480	const EVP_CIPHER *cipher = NULL;
481	int mac_pkey_type = NID_undef;
482	SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
483	size_t keylen, ivlen = EVP_MAX_IV_LENGTH, taglen;
484	int level;
485	int direction = (which & SSL3_CC_READ) != 0 ? OSSL_RECORD_DIRECTION_READ
486	: OSSL_RECORD_DIRECTION_WRITE;
487
488	if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
489	\|\| ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
490	if ((which & SSL3_CC_EARLY) != 0) {
491	EVP_MD_CTX *mdctx = NULL;
492	long handlen;
493	void *hdata;
494	unsigned int hashlenui;
495	const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
496
497	insecret = s->early_secret;
498	label = client_early_traffic;
499	labellen = sizeof(client_early_traffic) - 1;
500	log_label = CLIENT_EARLY_LABEL;
501
502	handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
503	if (handlen <= 0) {
504	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
505	goto err;
506	}
507
508	if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
509	&& s->max_early_data > 0
510	&& s->session->ext.max_early_data == 0) {
511	/*
512	* If we are attempting to send early data, and we've decided to
513	* actually do it but max_early_data in s->session is 0 then we
514	* must be using an external PSK.
515	*/
516	if (!ossl_assert(s->psksession != NULL
517	&& s->max_early_data ==
518	s->psksession->ext.max_early_data)) {
519	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
520	goto err;
521	}
522	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
523	}
524	if (sslcipher == NULL) {
525	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_PSK);
526	goto err;
527	}
528
529	/*
530	* This ups the ref count on cipher so we better make sure we free
531	* it again
532	*/
533	if (!ssl_cipher_get_evp_cipher(sctx, sslcipher, &cipher)) {
534	/* Error is already recorded */
535	SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
536	goto err;
537	}
538
539	if (((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) == 0)
540	&& (!ssl_cipher_get_evp_md_mac(sctx, sslcipher, &mac_md,
541	&mac_pkey_type, NULL))) {
542	SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
543	goto err;
544	}
545
546	/*
547	* We need to calculate the handshake digest using the digest from
548	* the session. We haven't yet selected our ciphersuite so we can't
549	* use ssl_handshake_md().
550	*/
551	mdctx = EVP_MD_CTX_new();
552	if (mdctx == NULL) {
553	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
554	goto err;
555	}
556
557	md = ssl_md(sctx, sslcipher->algorithm2);
558	if (md == NULL \|\| !EVP_DigestInit_ex(mdctx, md, NULL)
559	\|\| !EVP_DigestUpdate(mdctx, hdata, handlen)
560	\|\| !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
561	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
562	EVP_MD_CTX_free(mdctx);
563	goto err;
564	}
565	hashlen = hashlenui;
566	EVP_MD_CTX_free(mdctx);
567
568	if (!tls13_hkdf_expand(s, md, insecret,
569	early_exporter_master_secret,
570	sizeof(early_exporter_master_secret) - 1,
571	hashval, hashlen,
572	s->early_exporter_master_secret, hashlen,
573	1)) {
574	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
575	goto err;
576	}
577
578	if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
579	s->early_exporter_master_secret, hashlen)) {
580	/* SSLfatal() already called */
581	goto err;
582	}
583	} else if (which & SSL3_CC_HANDSHAKE) {
584	insecret = s->handshake_secret;
585	finsecret = s->client_finished_secret;
586	finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
587	if (finsecretlen <= 0) {
588	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
589	goto err;
590	}
591	label = client_handshake_traffic;
592	labellen = sizeof(client_handshake_traffic) - 1;
593	log_label = CLIENT_HANDSHAKE_LABEL;
594	/*
595	* The handshake hash used for the server read/client write handshake
596	* traffic secret is the same as the hash for the server
597	* write/client read handshake traffic secret. However, if we
598	* processed early data then we delay changing the server
599	* read/client write cipher state until later, and the handshake
600	* hashes have moved on. Therefore we use the value saved earlier
601	* when we did the server write/client read change cipher state.
602	*/
603	hash = s->handshake_traffic_hash;
604	} else {
605	insecret = s->master_secret;
606	label = client_application_traffic;
607	labellen = sizeof(client_application_traffic) - 1;
608	log_label = CLIENT_APPLICATION_LABEL;
609	/*
610	* For this we only use the handshake hashes up until the server
611	* Finished hash. We do not include the client's Finished, which is
612	* what ssl_handshake_hash() would give us. Instead we use the
613	* previously saved value.
614	*/
615	hash = s->server_finished_hash;
616	}
617	} else {
618	/* Early data never applies to client-read/server-write */
619	if (which & SSL3_CC_HANDSHAKE) {
620	insecret = s->handshake_secret;
621	finsecret = s->server_finished_secret;
622	finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
623	if (finsecretlen <= 0) {
624	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
625	goto err;
626	}
627	label = server_handshake_traffic;
628	labellen = sizeof(server_handshake_traffic) - 1;
629	log_label = SERVER_HANDSHAKE_LABEL;
630	} else {
631	insecret = s->master_secret;
632	label = server_application_traffic;
633	labellen = sizeof(server_application_traffic) - 1;
634	log_label = SERVER_APPLICATION_LABEL;
635	}
636	}
637
638	if ((which & SSL3_CC_EARLY) == 0) {
639	md = ssl_handshake_md(s);
640	cipher = s->s3.tmp.new_sym_enc;
641	mac_md = s->s3.tmp.new_hash;
642	mac_pkey_type = s->s3.tmp.new_mac_pkey_type;
643	if (!ssl3_digest_cached_records(s, 1)
644	\|\| !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
645	/* SSLfatal() already called */;
646	goto err;
647	}
648	}
649
650	/*
651	* Save the hash of handshakes up to now for use when we calculate the
652	* client application traffic secret
653	*/
654	if (label == server_application_traffic)
655	memcpy(s->server_finished_hash, hashval, hashlen);
656
657	if (label == server_handshake_traffic)
658	memcpy(s->handshake_traffic_hash, hashval, hashlen);
659
660	if (label == client_application_traffic) {
661	/*
662	* We also create the resumption master secret, but this time use the
663	* hash for the whole handshake including the Client Finished
664	*/
665	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
666	resumption_master_secret,
667	sizeof(resumption_master_secret) - 1,
668	hashval, hashlen, s->resumption_master_secret,
669	hashlen, 1)) {
670	/* SSLfatal() already called */
671	goto err;
672	}
673	}
674
675	/* check whether cipher is known */
676	if (!ossl_assert(cipher != NULL))
677	goto err;
678
679	if (!derive_secret_key_and_iv(s, md, cipher, mac_pkey_type, mac_md,
680	insecret, hash, label, labellen, secret, key,
681	&keylen, &iv, &ivlen, &taglen)) {
682	/* SSLfatal() already called */
683	goto err;
684	}
685
686	if (label == server_application_traffic) {
687	memcpy(s->server_app_traffic_secret, secret, hashlen);
688	/* Now we create the exporter master secret */
689	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
690	exporter_master_secret,
691	sizeof(exporter_master_secret) - 1,
692	hash, hashlen, s->exporter_master_secret,
693	hashlen, 1)) {
694	/* SSLfatal() already called */
695	goto err;
696	}
697
698	if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
699	hashlen)) {
700	/* SSLfatal() already called */
701	goto err;
702	}
703	} else if (label == client_application_traffic)
704	memcpy(s->client_app_traffic_secret, secret, hashlen);
705
706	if (!ssl_log_secret(s, log_label, secret, hashlen)) {
707	/* SSLfatal() already called */
708	goto err;
709	}
710
711	if (finsecret != NULL
712	&& !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
713	finsecret, (size_t)finsecretlen)) {
714	/* SSLfatal() already called */
715	goto err;
716	}
717
718	if ((which & SSL3_CC_WRITE) != 0) {
719	if (!s->server && label == client_early_traffic)
720	s->rlayer.wrlmethod->set_plain_alerts(s->rlayer.wrl, 1);
721	else
722	s->rlayer.wrlmethod->set_plain_alerts(s->rlayer.wrl, 0);
723	}
724
725	level = (which & SSL3_CC_EARLY) != 0
726	? OSSL_RECORD_PROTECTION_LEVEL_EARLY
727	: ((which &SSL3_CC_HANDSHAKE) != 0
728	? OSSL_RECORD_PROTECTION_LEVEL_HANDSHAKE
729	: OSSL_RECORD_PROTECTION_LEVEL_APPLICATION);
730
731	if (!ssl_set_new_record_layer(s, s->version,
732	direction,
733	level, secret, hashlen, key, keylen, iv,
734	ivlen, NULL, 0, cipher, taglen,
735	mac_pkey_type, mac_md, NULL, md)) {
736	/* SSLfatal already called */
737	goto err;
738	}
739
740	ret = 1;
741	err:
742	if ((which & SSL3_CC_EARLY) != 0) {
743	/* We up-refed this so now we need to down ref */
744	if ((EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) == 0)
745	ssl_evp_md_free(mac_md);
746	ssl_evp_cipher_free(cipher);
747	}
748	OPENSSL_cleanse(key, sizeof(key));
749	OPENSSL_cleanse(secret, sizeof(secret));
750	if (iv != iv_intern)
751	OPENSSL_free(iv);
752	return ret;
753	}
754
755	int tls13_update_key(SSL_CONNECTION *s, int sending)
756	{
757	/* ASCII: "traffic upd", in hex for EBCDIC compatibility */
758	static const unsigned char application_traffic[] = "\x74\x72\x61\x66\x66\x69\x63\x20\x75\x70\x64";
759	const EVP_MD *md = ssl_handshake_md(s);
760	size_t hashlen;
761	unsigned char key[EVP_MAX_KEY_LENGTH];
762	unsigned char *insecret;
763	unsigned char secret[EVP_MAX_MD_SIZE];
764	char *log_label;
765	size_t keylen, ivlen, taglen;
766	int ret = 0, l;
767	int direction = sending ? OSSL_RECORD_DIRECTION_WRITE
768	: OSSL_RECORD_DIRECTION_READ;
769	unsigned char iv_intern[EVP_MAX_IV_LENGTH];
770	unsigned char *iv = iv_intern;
771
772	if ((l = EVP_MD_get_size(md)) <= 0) {
773	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
774	return 0;
775	}
776	hashlen = (size_t)l;
777
778	if (s->server == sending)
779	insecret = s->server_app_traffic_secret;
780	else
781	insecret = s->client_app_traffic_secret;
782
783	if (!derive_secret_key_and_iv(s, md,
784	s->s3.tmp.new_sym_enc,
785	s->s3.tmp.new_mac_pkey_type, s->s3.tmp.new_hash,
786	insecret, NULL,
787	application_traffic,
788	sizeof(application_traffic) - 1, secret, key,
789	&keylen, &iv, &ivlen, &taglen)) {
790	/* SSLfatal() already called */
791	goto err;
792	}
793
794	memcpy(insecret, secret, hashlen);
795
796	if (!ssl_set_new_record_layer(s, s->version,
797	direction,
798	OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
799	insecret, hashlen, key, keylen, iv, ivlen, NULL, 0,
800	s->s3.tmp.new_sym_enc, taglen, NID_undef, NULL,
801	NULL, md)) {
802	/* SSLfatal already called */
803	goto err;
804	}
805
806	/* Call Key log on successful traffic secret update */
807	log_label = s->server == sending ? SERVER_APPLICATION_N_LABEL : CLIENT_APPLICATION_N_LABEL;
808	if (!ssl_log_secret(s, log_label, secret, hashlen)) {
809	/* SSLfatal() already called */
810	goto err;
811	}
812	ret = 1;
813	err:
814	OPENSSL_cleanse(key, sizeof(key));
815	OPENSSL_cleanse(secret, sizeof(secret));
816	if (iv != iv_intern)
817	OPENSSL_free(iv);
818	return ret;
819	}
820
821	int tls13_alert_code(int code)
822	{
823	/* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
824	if (code == SSL_AD_MISSING_EXTENSION \|\| code == SSL_AD_CERTIFICATE_REQUIRED)
825	return code;
826
827	return tls1_alert_code(code);
828	}
829
830	int tls13_export_keying_material(SSL_CONNECTION *s,
831	unsigned char *out, size_t olen,
832	const char *label, size_t llen,
833	const unsigned char *context,
834	size_t contextlen, int use_context)
835	{
836	unsigned char exportsecret[EVP_MAX_MD_SIZE];
837	/* ASCII: "exporter", in hex for EBCDIC compatibility */
838	static const unsigned char exporterlabel[] = "\x65\x78\x70\x6F\x72\x74\x65\x72";
839	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
840	const EVP_MD *md = ssl_handshake_md(s);
841	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
842	unsigned int hashsize, datalen;
843	int ret = 0;
844
845	if (ctx == NULL \|\| md == NULL \|\| !ossl_statem_export_allowed(s))
846	goto err;
847
848	if (!use_context)
849	contextlen = 0;
850
851	if (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->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	}
869
870	int tls13_export_keying_material_early(SSL_CONNECTION *s,
871	unsigned char *out, size_t olen,
872	const char *label, size_t llen,
873	const unsigned char *context,
874	size_t contextlen)
875	{
876	/* ASCII: "exporter", in hex for EBCDIC compatibility */
877	static const unsigned char exporterlabel[] = "\x65\x78\x70\x6F\x72\x74\x65\x72";
878	unsigned char exportsecret[EVP_MAX_MD_SIZE];
879	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
880	const EVP_MD *md;
881	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
882	unsigned int hashsize, datalen;
883	int ret = 0;
884	const SSL_CIPHER *sslcipher;
885
886	if (ctx == NULL \|\| !ossl_statem_export_early_allowed(s))
887	goto err;
888
889	if (!s->server && s->max_early_data > 0
890	&& s->session->ext.max_early_data == 0)
891	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
892	else
893	sslcipher = SSL_SESSION_get0_cipher(s->session);
894
895	md = ssl_md(SSL_CONNECTION_GET_CTX(s), sslcipher->algorithm2);
896
897	/*
898	* Calculate the hash value and store it in \|data\|. The reason why
899	* the empty string is used is that the definition of TLS-Exporter
900	* is like so:
901	*
902	* TLS-Exporter(label, context_value, key_length) =
903	* HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
904	* "exporter", Hash(context_value), key_length)
905	*
906	* Derive-Secret(Secret, Label, Messages) =
907	* HKDF-Expand-Label(Secret, Label,
908	* Transcript-Hash(Messages), Hash.length)
909	*
910	* Here Transcript-Hash is the cipher suite hash algorithm.
911	*/
912	if (md == NULL
913	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
914	\|\| EVP_DigestUpdate(ctx, context, contextlen) <= 0
915	\|\| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
916	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
917	\|\| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
918	\|\| !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
919	(const unsigned char *)label, llen,
920	data, datalen, exportsecret, hashsize, 0)
921	\|\| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
922	sizeof(exporterlabel) - 1, hash, hashsize,
923	out, olen, 0))
924	goto err;
925
926	ret = 1;
927	err:
928	EVP_MD_CTX_free(ctx);
929	return ret;
930	}

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source: vbox/trunk/src/libs/openssl-3.4.1/ssl/tls13_enc.c@ 109302

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