tls13_enc.c@ 98704

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1	/*
2	* Copyright 2016-2022 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	#ifdef CHARSET_EBCDIC
22	static const unsigned char label_prefix[] = { 0x74, 0x6C, 0x73, 0x31, 0x33, 0x20, 0x00 };
23	#else
24	static const unsigned char label_prefix[] = "tls13 ";
25	#endif
26
27	/*
28	* Given a \|secret\|; a \|label\| of length \|labellen\|; and \|data\| of length
29	* \|datalen\| (e.g. typically a hash of the handshake messages), derive a new
30	* secret \|outlen\| bytes long and store it in the location pointed to be \|out\|.
31	* The \|data\| value may be zero length. Any errors will be treated as fatal if
32	* \|fatal\| is set. Returns 1 on success 0 on failure.
33	*/
34	int tls13_hkdf_expand(SSL s, const EVP_MD md, 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 fatal)
38	{
39	EVP_KDF *kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_TLS1_3_KDF,
40	s->ctx->propq);
41	EVP_KDF_CTX *kctx;
42	OSSL_PARAM params[7], *p = params;
43	int mode = EVP_PKEY_HKDEF_MODE_EXPAND_ONLY;
44	const char *mdname = EVP_MD_get0_name(md);
45	int ret;
46	size_t hashlen;
47
48	kctx = EVP_KDF_CTX_new(kdf);
49	EVP_KDF_free(kdf);
50	if (kctx == NULL)
51	return 0;
52
53	if (labellen > TLS13_MAX_LABEL_LEN) {
54	if (fatal) {
55	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
56	} else {
57	/*
58	* Probably we have been called from SSL_export_keying_material(),
59	* or SSL_export_keying_material_early().
60	*/
61	ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
62	}
63	EVP_KDF_CTX_free(kctx);
64	return 0;
65	}
66
67	if ((ret = EVP_MD_get_size(md)) <= 0) {
68	EVP_KDF_CTX_free(kctx);
69	if (fatal)
70	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
71	else
72	ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
73	return 0;
74	}
75	hashlen = (size_t)ret;
76
77	*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
78	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
79	(char *)mdname, 0);
80	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
81	(unsigned char *)secret, hashlen);
82	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX,
83	(unsigned char *)label_prefix,
84	sizeof(label_prefix) - 1);
85	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL,
86	(unsigned char *)label, labellen);
87	if (data != NULL)
88	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_DATA,
89	(unsigned char *)data,
90	datalen);
91	*p++ = OSSL_PARAM_construct_end();
92
93	ret = EVP_KDF_derive(kctx, out, outlen, params) <= 0;
94	EVP_KDF_CTX_free(kctx);
95
96	if (ret != 0) {
97	if (fatal)
98	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
99	else
100	ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
101	}
102
103	return ret == 0;
104	}
105
106	/*
107	* Given a \|secret\| generate a \|key\| of length \|keylen\| bytes. Returns 1 on
108	* success 0 on failure.
109	*/
110	int tls13_derive_key(SSL s, const EVP_MD md, const unsigned char *secret,
111	unsigned char *key, size_t keylen)
112	{
113	#ifdef CHARSET_EBCDIC
114	static const unsigned char keylabel[] ={ 0x6B, 0x65, 0x79, 0x00 };
115	#else
116	static const unsigned char keylabel[] = "key";
117	#endif
118
119	return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
120	NULL, 0, key, keylen, 1);
121	}
122
123	/*
124	* Given a \|secret\| generate an \|iv\| of length \|ivlen\| bytes. Returns 1 on
125	* success 0 on failure.
126	*/
127	int tls13_derive_iv(SSL s, const EVP_MD md, const unsigned char *secret,
128	unsigned char *iv, size_t ivlen)
129	{
130	#ifdef CHARSET_EBCDIC
131	static const unsigned char ivlabel[] = { 0x69, 0x76, 0x00 };
132	#else
133	static const unsigned char ivlabel[] = "iv";
134	#endif
135
136	return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
137	NULL, 0, iv, ivlen, 1);
138	}
139
140	int tls13_derive_finishedkey(SSL s, const EVP_MD md,
141	const unsigned char *secret,
142	unsigned char *fin, size_t finlen)
143	{
144	#ifdef CHARSET_EBCDIC
145	static const unsigned char finishedlabel[] = { 0x66, 0x69, 0x6E, 0x69, 0x73, 0x68, 0x65, 0x64, 0x00 };
146	#else
147	static const unsigned char finishedlabel[] = "finished";
148	#endif
149
150	return tls13_hkdf_expand(s, md, secret, finishedlabel,
151	sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
152	}
153
154	/*
155	* Given the previous secret \|prevsecret\| and a new input secret \|insecret\| of
156	* length \|insecretlen\|, generate a new secret and store it in the location
157	* pointed to by \|outsecret\|. Returns 1 on success 0 on failure.
158	*/
159	int tls13_generate_secret(SSL s, const EVP_MD md,
160	const unsigned char *prevsecret,
161	const unsigned char *insecret,
162	size_t insecretlen,
163	unsigned char *outsecret)
164	{
165	size_t mdlen;
166	int mdleni;
167	int ret;
168	EVP_KDF *kdf;
169	EVP_KDF_CTX *kctx;
170	OSSL_PARAM params[7], *p = params;
171	int mode = EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY;
172	const char *mdname = EVP_MD_get0_name(md);
173	#ifdef CHARSET_EBCDIC
174	static const char derived_secret_label[] = { 0x64, 0x65, 0x72, 0x69, 0x76, 0x65, 0x64, 0x00 };
175	#else
176	static const char derived_secret_label[] = "derived";
177	#endif
178
179	kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_TLS1_3_KDF, s->ctx->propq);
180	kctx = EVP_KDF_CTX_new(kdf);
181	EVP_KDF_free(kdf);
182	if (kctx == NULL) {
183	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
184	return 0;
185	}
186
187	mdleni = EVP_MD_get_size(md);
188	/* Ensure cast to size_t is safe */
189	if (!ossl_assert(mdleni >= 0)) {
190	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
191	EVP_KDF_CTX_free(kctx);
192	return 0;
193	}
194	mdlen = (size_t)mdleni;
195
196	*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
197	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
198	(char *)mdname, 0);
199	if (insecret != NULL)
200	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
201	(unsigned char *)insecret,
202	insecretlen);
203	if (prevsecret != NULL)
204	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
205	(unsigned char *)prevsecret, mdlen);
206	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX,
207	(unsigned char *)label_prefix,
208	sizeof(label_prefix) - 1);
209	*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL,
210	(unsigned char *)derived_secret_label,
211	sizeof(derived_secret_label) - 1);
212	*p++ = OSSL_PARAM_construct_end();
213
214	ret = EVP_KDF_derive(kctx, outsecret, mdlen, params) <= 0;
215
216	if (ret != 0)
217	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
218
219	EVP_KDF_CTX_free(kctx);
220	return ret == 0;
221	}
222
223	/*
224	* Given an input secret \|insecret\| of length \|insecretlen\| generate the
225	* handshake secret. This requires the early secret to already have been
226	* generated. Returns 1 on success 0 on failure.
227	*/
228	int tls13_generate_handshake_secret(SSL s, const unsigned char insecret,
229	size_t insecretlen)
230	{
231	/* Calls SSLfatal() if required */
232	return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
233	insecret, insecretlen,
234	(unsigned char *)&s->handshake_secret);
235	}
236
237	/*
238	* Given the handshake secret \|prev\| of length \|prevlen\| generate the master
239	* secret and store its length in \|*secret_size\|. Returns 1 on success 0 on
240	* failure.
241	*/
242	int tls13_generate_master_secret(SSL s, unsigned char out,
243	unsigned char *prev, size_t prevlen,
244	size_t *secret_size)
245	{
246	const EVP_MD *md = ssl_handshake_md(s);
247
248	*secret_size = EVP_MD_get_size(md);
249	/* Calls SSLfatal() if required */
250	return tls13_generate_secret(s, md, prev, NULL, 0, out);
251	}
252
253	/*
254	* Generates the mac for the Finished message. Returns the length of the MAC or
255	* 0 on error.
256	*/
257	size_t tls13_final_finish_mac(SSL s, const char str, size_t slen,
258	unsigned char *out)
259	{
260	const EVP_MD *md = ssl_handshake_md(s);
261	const char *mdname = EVP_MD_get0_name(md);
262	unsigned char hash[EVP_MAX_MD_SIZE];
263	unsigned char finsecret[EVP_MAX_MD_SIZE];
264	unsigned char *key = NULL;
265	size_t len = 0, hashlen;
266	OSSL_PARAM params[2], *p = params;
267
268	if (md == NULL)
269	return 0;
270
271	/* Safe to cast away const here since we're not "getting" any data */
272	if (s->ctx->propq != NULL)
273	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES,
274	(char *)s->ctx->propq,
275	0);
276	*p = OSSL_PARAM_construct_end();
277
278	if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
279	/* SSLfatal() already called */
280	goto err;
281	}
282
283	if (str == s->method->ssl3_enc->server_finished_label) {
284	key = s->server_finished_secret;
285	} else if (SSL_IS_FIRST_HANDSHAKE(s)) {
286	key = s->client_finished_secret;
287	} else {
288	if (!tls13_derive_finishedkey(s, md,
289	s->client_app_traffic_secret,
290	finsecret, hashlen))
291	goto err;
292	key = finsecret;
293	}
294
295	if (!EVP_Q_mac(s->ctx->libctx, "HMAC", s->ctx->propq, mdname,
296	params, key, hashlen, hash, hashlen,
297	/* outsize as per sizeof(peer_finish_md) */
298	out, EVP_MAX_MD_SIZE * 2, &len)) {
299	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
300	goto err;
301	}
302
303	err:
304	OPENSSL_cleanse(finsecret, sizeof(finsecret));
305	return len;
306	}
307
308	/*
309	* There isn't really a key block in TLSv1.3, but we still need this function
310	* for initialising the cipher and hash. Returns 1 on success or 0 on failure.
311	*/
312	int tls13_setup_key_block(SSL *s)
313	{
314	const EVP_CIPHER *c;
315	const EVP_MD *hash;
316
317	s->session->cipher = s->s3.tmp.new_cipher;
318	if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, NULL, NULL, NULL,
319	0)) {
320	/* Error is already recorded */
321	SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
322	return 0;
323	}
324
325	ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
326	s->s3.tmp.new_sym_enc = c;
327	ssl_evp_md_free(s->s3.tmp.new_hash);
328	s->s3.tmp.new_hash = hash;
329
330	return 1;
331	}
332
333	static int derive_secret_key_and_iv(SSL s, int sending, const EVP_MD md,
334	const EVP_CIPHER *ciph,
335	const unsigned char *insecret,
336	const unsigned char *hash,
337	const unsigned char *label,
338	size_t labellen, unsigned char *secret,
339	unsigned char key, unsigned char iv,
340	EVP_CIPHER_CTX *ciph_ctx)
341	{
342	size_t ivlen, keylen, taglen;
343	int hashleni = EVP_MD_get_size(md);
344	size_t hashlen;
345
346	/* Ensure cast to size_t is safe */
347	if (!ossl_assert(hashleni >= 0)) {
348	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
349	return 0;
350	}
351	hashlen = (size_t)hashleni;
352
353	if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
354	secret, hashlen, 1)) {
355	/* SSLfatal() already called */
356	return 0;
357	}
358
359	keylen = EVP_CIPHER_get_key_length(ciph);
360	if (EVP_CIPHER_get_mode(ciph) == EVP_CIPH_CCM_MODE) {
361	uint32_t algenc;
362
363	ivlen = EVP_CCM_TLS_IV_LEN;
364	if (s->s3.tmp.new_cipher != NULL) {
365	algenc = s->s3.tmp.new_cipher->algorithm_enc;
366	} else if (s->session->cipher != NULL) {
367	/* We've not selected a cipher yet - we must be doing early data */
368	algenc = s->session->cipher->algorithm_enc;
369	} else if (s->psksession != NULL && s->psksession->cipher != NULL) {
370	/* We must be doing early data with out-of-band PSK */
371	algenc = s->psksession->cipher->algorithm_enc;
372	} else {
373	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
374	return 0;
375	}
376	if (algenc & (SSL_AES128CCM8 \| SSL_AES256CCM8))
377	taglen = EVP_CCM8_TLS_TAG_LEN;
378	else
379	taglen = EVP_CCM_TLS_TAG_LEN;
380	} else {
381	ivlen = EVP_CIPHER_get_iv_length(ciph);
382	taglen = 0;
383	}
384
385	if (!tls13_derive_key(s, md, secret, key, keylen)
386	\|\| !tls13_derive_iv(s, md, secret, iv, ivlen)) {
387	/* SSLfatal() already called */
388	return 0;
389	}
390
391	if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, NULL, NULL, sending) <= 0
392	\|\| EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL) <= 0
393	\|\| (taglen != 0 && EVP_CIPHER_CTX_ctrl(ciph_ctx, EVP_CTRL_AEAD_SET_TAG,
394	taglen, NULL) <= 0)
395	\|\| EVP_CipherInit_ex(ciph_ctx, NULL, NULL, key, NULL, -1) <= 0) {
396	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
397	return 0;
398	}
399
400	return 1;
401	}
402
403	int tls13_change_cipher_state(SSL *s, int which)
404	{
405	#ifdef CHARSET_EBCDIC
406	static const unsigned char client_early_traffic[] = {0x63, 0x20, 0x65, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
407	static const unsigned char client_handshake_traffic[] = {0x63, 0x20, 0x68, 0x73, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
408	static const unsigned char client_application_traffic[] = {0x63, 0x20, 0x61, 0x70, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
409	static const unsigned char server_handshake_traffic[] = {0x73, 0x20, 0x68, 0x73, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
410	static const unsigned char server_application_traffic[] = {0x73, 0x20, 0x61, 0x70, 0x20, /traffic/0x74, 0x72, 0x61, 0x66, 0x66, 0x69, 0x63, 0x00};
411	static const unsigned char exporter_master_secret[] = {0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
412	static const unsigned char resumption_master_secret[] = {0x72, 0x65, 0x73, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
413	static const unsigned char early_exporter_master_secret[] = {0x65, 0x20, 0x65, 0x78, 0x70, 0x20, /* master*/ 0x6D, 0x61, 0x73, 0x74, 0x65, 0x72, 0x00};
414	#else
415	static const unsigned char client_early_traffic[] = "c e traffic";
416	static const unsigned char client_handshake_traffic[] = "c hs traffic";
417	static const unsigned char client_application_traffic[] = "c ap traffic";
418	static const unsigned char server_handshake_traffic[] = "s hs traffic";
419	static const unsigned char server_application_traffic[] = "s ap traffic";
420	static const unsigned char exporter_master_secret[] = "exp master";
421	static const unsigned char resumption_master_secret[] = "res master";
422	static const unsigned char early_exporter_master_secret[] = "e exp master";
423	#endif
424	unsigned char *iv;
425	unsigned char key[EVP_MAX_KEY_LENGTH];
426	unsigned char secret[EVP_MAX_MD_SIZE];
427	unsigned char hashval[EVP_MAX_MD_SIZE];
428	unsigned char *hash = hashval;
429	unsigned char *insecret;
430	unsigned char *finsecret = NULL;
431	const char *log_label = NULL;
432	EVP_CIPHER_CTX *ciph_ctx;
433	size_t finsecretlen = 0;
434	const unsigned char *label;
435	size_t labellen, hashlen = 0;
436	int ret = 0;
437	const EVP_MD *md = NULL;
438	const EVP_CIPHER *cipher = NULL;
439	#if !defined(OPENSSL_NO_KTLS) && defined(OPENSSL_KTLS_TLS13)
440	ktls_crypto_info_t crypto_info;
441	BIO *bio;
442	#endif
443
444	if (which & SSL3_CC_READ) {
445	if (s->enc_read_ctx != NULL) {
446	EVP_CIPHER_CTX_reset(s->enc_read_ctx);
447	} else {
448	s->enc_read_ctx = EVP_CIPHER_CTX_new();
449	if (s->enc_read_ctx == NULL) {
450	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
451	goto err;
452	}
453	}
454	ciph_ctx = s->enc_read_ctx;
455	iv = s->read_iv;
456
457	RECORD_LAYER_reset_read_sequence(&s->rlayer);
458	} else {
459	s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
460	if (s->enc_write_ctx != NULL) {
461	EVP_CIPHER_CTX_reset(s->enc_write_ctx);
462	} else {
463	s->enc_write_ctx = EVP_CIPHER_CTX_new();
464	if (s->enc_write_ctx == NULL) {
465	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
466	goto err;
467	}
468	}
469	ciph_ctx = s->enc_write_ctx;
470	iv = s->write_iv;
471
472	RECORD_LAYER_reset_write_sequence(&s->rlayer);
473	}
474
475	if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
476	\|\| ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
477	if (which & SSL3_CC_EARLY) {
478	EVP_MD_CTX *mdctx = NULL;
479	long handlen;
480	void *hdata;
481	unsigned int hashlenui;
482	const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
483
484	insecret = s->early_secret;
485	label = client_early_traffic;
486	labellen = sizeof(client_early_traffic) - 1;
487	log_label = CLIENT_EARLY_LABEL;
488
489	handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
490	if (handlen <= 0) {
491	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
492	goto err;
493	}
494
495	if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
496	&& s->max_early_data > 0
497	&& s->session->ext.max_early_data == 0) {
498	/*
499	* If we are attempting to send early data, and we've decided to
500	* actually do it but max_early_data in s->session is 0 then we
501	* must be using an external PSK.
502	*/
503	if (!ossl_assert(s->psksession != NULL
504	&& s->max_early_data ==
505	s->psksession->ext.max_early_data)) {
506	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
507	goto err;
508	}
509	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
510	}
511	if (sslcipher == NULL) {
512	SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_PSK);
513	goto err;
514	}
515
516	/*
517	* We need to calculate the handshake digest using the digest from
518	* the session. We haven't yet selected our ciphersuite so we can't
519	* use ssl_handshake_md().
520	*/
521	mdctx = EVP_MD_CTX_new();
522	if (mdctx == NULL) {
523	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
524	goto err;
525	}
526
527	/*
528	* This ups the ref count on cipher so we better make sure we free
529	* it again
530	*/
531	if (!ssl_cipher_get_evp_cipher(s->ctx, sslcipher, &cipher)) {
532	/* Error is already recorded */
533	SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
534	EVP_MD_CTX_free(mdctx);
535	goto err;
536	}
537
538	md = ssl_md(s->ctx, sslcipher->algorithm2);
539	if (md == NULL \|\| !EVP_DigestInit_ex(mdctx, md, NULL)
540	\|\| !EVP_DigestUpdate(mdctx, hdata, handlen)
541	\|\| !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
542	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
543	EVP_MD_CTX_free(mdctx);
544	goto err;
545	}
546	hashlen = hashlenui;
547	EVP_MD_CTX_free(mdctx);
548
549	if (!tls13_hkdf_expand(s, md, insecret,
550	early_exporter_master_secret,
551	sizeof(early_exporter_master_secret) - 1,
552	hashval, hashlen,
553	s->early_exporter_master_secret, hashlen,
554	1)) {
555	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
556	goto err;
557	}
558
559	if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
560	s->early_exporter_master_secret, hashlen)) {
561	/* SSLfatal() already called */
562	goto err;
563	}
564	} else if (which & SSL3_CC_HANDSHAKE) {
565	insecret = s->handshake_secret;
566	finsecret = s->client_finished_secret;
567	finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
568	label = client_handshake_traffic;
569	labellen = sizeof(client_handshake_traffic) - 1;
570	log_label = CLIENT_HANDSHAKE_LABEL;
571	/*
572	* The handshake hash used for the server read/client write handshake
573	* traffic secret is the same as the hash for the server
574	* write/client read handshake traffic secret. However, if we
575	* processed early data then we delay changing the server
576	* read/client write cipher state until later, and the handshake
577	* hashes have moved on. Therefore we use the value saved earlier
578	* when we did the server write/client read change cipher state.
579	*/
580	hash = s->handshake_traffic_hash;
581	} else {
582	insecret = s->master_secret;
583	label = client_application_traffic;
584	labellen = sizeof(client_application_traffic) - 1;
585	log_label = CLIENT_APPLICATION_LABEL;
586	/*
587	* For this we only use the handshake hashes up until the server
588	* Finished hash. We do not include the client's Finished, which is
589	* what ssl_handshake_hash() would give us. Instead we use the
590	* previously saved value.
591	*/
592	hash = s->server_finished_hash;
593	}
594	} else {
595	/* Early data never applies to client-read/server-write */
596	if (which & SSL3_CC_HANDSHAKE) {
597	insecret = s->handshake_secret;
598	finsecret = s->server_finished_secret;
599	finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
600	label = server_handshake_traffic;
601	labellen = sizeof(server_handshake_traffic) - 1;
602	log_label = SERVER_HANDSHAKE_LABEL;
603	} else {
604	insecret = s->master_secret;
605	label = server_application_traffic;
606	labellen = sizeof(server_application_traffic) - 1;
607	log_label = SERVER_APPLICATION_LABEL;
608	}
609	}
610
611	if (!(which & SSL3_CC_EARLY)) {
612	md = ssl_handshake_md(s);
613	cipher = s->s3.tmp.new_sym_enc;
614	if (!ssl3_digest_cached_records(s, 1)
615	\|\| !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
616	/* SSLfatal() already called */;
617	goto err;
618	}
619	}
620
621	/*
622	* Save the hash of handshakes up to now for use when we calculate the
623	* client application traffic secret
624	*/
625	if (label == server_application_traffic)
626	memcpy(s->server_finished_hash, hashval, hashlen);
627
628	if (label == server_handshake_traffic)
629	memcpy(s->handshake_traffic_hash, hashval, hashlen);
630
631	if (label == client_application_traffic) {
632	/*
633	* We also create the resumption master secret, but this time use the
634	* hash for the whole handshake including the Client Finished
635	*/
636	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
637	resumption_master_secret,
638	sizeof(resumption_master_secret) - 1,
639	hashval, hashlen, s->resumption_master_secret,
640	hashlen, 1)) {
641	/* SSLfatal() already called */
642	goto err;
643	}
644	}
645
646	/* check whether cipher is known */
647	if(!ossl_assert(cipher != NULL))
648	goto err;
649
650	if (!derive_secret_key_and_iv(s, which & SSL3_CC_WRITE, md, cipher,
651	insecret, hash, label, labellen, secret, key,
652	iv, ciph_ctx)) {
653	/* SSLfatal() already called */
654	goto err;
655	}
656
657	if (label == server_application_traffic) {
658	memcpy(s->server_app_traffic_secret, secret, hashlen);
659	/* Now we create the exporter master secret */
660	if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
661	exporter_master_secret,
662	sizeof(exporter_master_secret) - 1,
663	hash, hashlen, s->exporter_master_secret,
664	hashlen, 1)) {
665	/* SSLfatal() already called */
666	goto err;
667	}
668
669	if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
670	hashlen)) {
671	/* SSLfatal() already called */
672	goto err;
673	}
674	} else if (label == client_application_traffic)
675	memcpy(s->client_app_traffic_secret, secret, hashlen);
676
677	if (!ssl_log_secret(s, log_label, secret, hashlen)) {
678	/* SSLfatal() already called */
679	goto err;
680	}
681
682	if (finsecret != NULL
683	&& !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
684	finsecret, finsecretlen)) {
685	/* SSLfatal() already called */
686	goto err;
687	}
688
689	if (!s->server && label == client_early_traffic)
690	s->statem.enc_write_state = ENC_WRITE_STATE_WRITE_PLAIN_ALERTS;
691	else
692	s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
693	#ifndef OPENSSL_NO_KTLS
694	# if defined(OPENSSL_KTLS_TLS13)
695	if (!(which & SSL3_CC_WRITE)
696	\|\| !(which & SSL3_CC_APPLICATION)
697	\|\| (s->options & SSL_OP_ENABLE_KTLS) == 0)
698	goto skip_ktls;
699
700	/* ktls supports only the maximum fragment size */
701	if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
702	goto skip_ktls;
703
704	/* ktls does not support record padding */
705	if (s->record_padding_cb != NULL)
706	goto skip_ktls;
707
708	/* check that cipher is supported */
709	if (!ktls_check_supported_cipher(s, cipher, ciph_ctx))
710	goto skip_ktls;
711
712	bio = s->wbio;
713
714	if (!ossl_assert(bio != NULL)) {
715	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
716	goto err;
717	}
718
719	/* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
720	if (BIO_flush(bio) <= 0)
721	goto skip_ktls;
722
723	/* configure kernel crypto structure */
724	if (!ktls_configure_crypto(s, cipher, ciph_ctx,
725	RECORD_LAYER_get_write_sequence(&s->rlayer),
726	&crypto_info, NULL, iv, key, NULL, 0))
727	goto skip_ktls;
728
729	/* ktls works with user provided buffers directly */
730	if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE))
731	ssl3_release_write_buffer(s);
732	skip_ktls:
733	# endif
734	#endif
735	ret = 1;
736	err:
737	if ((which & SSL3_CC_EARLY) != 0) {
738	/* We up-refed this so now we need to down ref */
739	ssl_evp_cipher_free(cipher);
740	}
741	OPENSSL_cleanse(key, sizeof(key));
742	OPENSSL_cleanse(secret, sizeof(secret));
743	return ret;
744	}
745
746	int tls13_update_key(SSL *s, int sending)
747	{
748	#ifdef CHARSET_EBCDIC
749	static const unsigned char application_traffic[] = { 0x74, 0x72 ,0x61 ,0x66 ,0x66 ,0x69 ,0x63 ,0x20 ,0x75 ,0x70 ,0x64, 0x00};
750	#else
751	static const unsigned char application_traffic[] = "traffic upd";
752	#endif
753	const EVP_MD *md = ssl_handshake_md(s);
754	size_t hashlen;
755	unsigned char key[EVP_MAX_KEY_LENGTH];
756	unsigned char insecret, iv;
757	unsigned char secret[EVP_MAX_MD_SIZE];
758	char *log_label;
759	EVP_CIPHER_CTX *ciph_ctx;
760	int ret = 0, l;
761
762	if ((l = EVP_MD_get_size(md)) <= 0) {
763	SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
764	return 0;
765	}
766	hashlen = (size_t)l;
767
768	if (s->server == sending)
769	insecret = s->server_app_traffic_secret;
770	else
771	insecret = s->client_app_traffic_secret;
772
773	if (sending) {
774	s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
775	iv = s->write_iv;
776	ciph_ctx = s->enc_write_ctx;
777	RECORD_LAYER_reset_write_sequence(&s->rlayer);
778	} else {
779	iv = s->read_iv;
780	ciph_ctx = s->enc_read_ctx;
781	RECORD_LAYER_reset_read_sequence(&s->rlayer);
782	}
783
784	if (!derive_secret_key_and_iv(s, sending, md,
785	s->s3.tmp.new_sym_enc, insecret, NULL,
786	application_traffic,
787	sizeof(application_traffic) - 1, secret, key,
788	iv, ciph_ctx)) {
789	/* SSLfatal() already called */
790	goto err;
791	}
792
793	memcpy(insecret, secret, hashlen);
794
795	/* Call Key log on successful traffic secret update */
796	log_label = s->server == sending ? SERVER_APPLICATION_N_LABEL : CLIENT_APPLICATION_N_LABEL;
797	if (!ssl_log_secret(s, log_label, secret, hashlen)) {
798	/* SSLfatal() already called */
799	goto err;
800	}
801
802	s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
803	ret = 1;
804	err:
805	OPENSSL_cleanse(key, sizeof(key));
806	OPENSSL_cleanse(secret, sizeof(secret));
807	return ret;
808	}
809
810	int tls13_alert_code(int code)
811	{
812	/* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
813	if (code == SSL_AD_MISSING_EXTENSION \|\| code == SSL_AD_CERTIFICATE_REQUIRED)
814	return code;
815
816	return tls1_alert_code(code);
817	}
818
819	int tls13_export_keying_material(SSL s, unsigned char out, size_t olen,
820	const char *label, size_t llen,
821	const unsigned char *context,
822	size_t contextlen, int use_context)
823	{
824	unsigned char exportsecret[EVP_MAX_MD_SIZE];
825	#ifdef CHARSET_EBCDIC
826	static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
827	#else
828	static const unsigned char exporterlabel[] = "exporter";
829	#endif
830	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
831	const EVP_MD *md = ssl_handshake_md(s);
832	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
833	unsigned int hashsize, datalen;
834	int ret = 0;
835
836	if (ctx == NULL \|\| md == NULL \|\| !ossl_statem_export_allowed(s))
837	goto err;
838
839	if (!use_context)
840	contextlen = 0;
841
842	if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
843	\|\| EVP_DigestUpdate(ctx, context, contextlen) <= 0
844	\|\| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
845	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
846	\|\| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
847	\|\| !tls13_hkdf_expand(s, md, s->exporter_master_secret,
848	(const unsigned char *)label, llen,
849	data, datalen, exportsecret, hashsize, 0)
850	\|\| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
851	sizeof(exporterlabel) - 1, hash, hashsize,
852	out, olen, 0))
853	goto err;
854
855	ret = 1;
856	err:
857	EVP_MD_CTX_free(ctx);
858	return ret;
859	}
860
861	int tls13_export_keying_material_early(SSL s, unsigned char out, size_t olen,
862	const char *label, size_t llen,
863	const unsigned char *context,
864	size_t contextlen)
865	{
866	#ifdef CHARSET_EBCDIC
867	static const unsigned char exporterlabel[] = {0x65, 0x78, 0x70, 0x6F, 0x72, 0x74, 0x65, 0x72, 0x00};
868	#else
869	static const unsigned char exporterlabel[] = "exporter";
870	#endif
871	unsigned char exportsecret[EVP_MAX_MD_SIZE];
872	unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
873	const EVP_MD *md;
874	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
875	unsigned int hashsize, datalen;
876	int ret = 0;
877	const SSL_CIPHER *sslcipher;
878
879	if (ctx == NULL \|\| !ossl_statem_export_early_allowed(s))
880	goto err;
881
882	if (!s->server && s->max_early_data > 0
883	&& s->session->ext.max_early_data == 0)
884	sslcipher = SSL_SESSION_get0_cipher(s->psksession);
885	else
886	sslcipher = SSL_SESSION_get0_cipher(s->session);
887
888	md = ssl_md(s->ctx, sslcipher->algorithm2);
889
890	/*
891	* Calculate the hash value and store it in \|data\|. The reason why
892	* the empty string is used is that the definition of TLS-Exporter
893	* is like so:
894	*
895	* TLS-Exporter(label, context_value, key_length) =
896	* HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
897	* "exporter", Hash(context_value), key_length)
898	*
899	* Derive-Secret(Secret, Label, Messages) =
900	* HKDF-Expand-Label(Secret, Label,
901	* Transcript-Hash(Messages), Hash.length)
902	*
903	* Here Transcript-Hash is the cipher suite hash algorithm.
904	*/
905	if (md == NULL
906	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
907	\|\| EVP_DigestUpdate(ctx, context, contextlen) <= 0
908	\|\| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
909	\|\| EVP_DigestInit_ex(ctx, md, NULL) <= 0
910	\|\| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
911	\|\| !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
912	(const unsigned char *)label, llen,
913	data, datalen, exportsecret, hashsize, 0)
914	\|\| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
915	sizeof(exporterlabel) - 1, hash, hashsize,
916	out, olen, 0))
917	goto err;
918
919	ret = 1;
920	err:
921	EVP_MD_CTX_free(ctx);
922	return ret;
923	}

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source: vbox/trunk/src/libs/openssl-3.0.7/ssl/tls13_enc.c@ 98704

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