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openssl/ssl/tls13_enc.c
Jiasheng Jiang d53497670d Alter the variable name 
Alter the variable name to make it more meaningful.

Signed-off-by: Jiasheng Jiang <jiasheng@purdue.edu>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23942)
2024-04-02 05:37:00 -04:00

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/*
* Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdlib.h>
#include "ssl_local.h"
#include "internal/ktls.h"
#include "record/record_local.h"
#include "internal/cryptlib.h"
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include <openssl/core_names.h>
#define TLS13_MAX_LABEL_LEN 249
/* ASCII: "tls13 ", in hex for EBCDIC compatibility */
static const unsigned char label_prefix[] = "\x74\x6C\x73\x31\x33\x20";
/*
* Given a |secret|; a |label| of length |labellen|; and |data| of length
* |datalen| (e.g. typically a hash of the handshake messages), derive a new
* secret |outlen| bytes long and store it in the location pointed to be |out|.
* The |data| value may be zero length. Any errors will be treated as fatal if
* |fatal| is set. Returns 1 on success 0 on failure.
* If |raise_error| is set, ERR_raise is called on failure.
*/
int tls13_hkdf_expand_ex(OSSL_LIB_CTX *libctx, const char *propq,
const EVP_MD *md,
const unsigned char *secret,
const unsigned char *label, size_t labellen,
const unsigned char *data, size_t datalen,
unsigned char *out, size_t outlen, int raise_error)
{
EVP_KDF *kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_TLS1_3_KDF, propq);
EVP_KDF_CTX *kctx;
OSSL_PARAM params[7], *p = params;
int mode = EVP_PKEY_HKDEF_MODE_EXPAND_ONLY;
const char *mdname = EVP_MD_get0_name(md);
int ret;
size_t hashlen;
kctx = EVP_KDF_CTX_new(kdf);
EVP_KDF_free(kdf);
if (kctx == NULL)
return 0;
if (labellen > TLS13_MAX_LABEL_LEN) {
if (raise_error)
/*
* Probably we have been called from SSL_export_keying_material(),
* or SSL_export_keying_material_early().
*/
ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
EVP_KDF_CTX_free(kctx);
return 0;
}
if ((ret = EVP_MD_get_size(md)) <= 0) {
EVP_KDF_CTX_free(kctx);
if (raise_error)
ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
return 0;
}
hashlen = (size_t)ret;
*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
(char *)mdname, 0);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
(unsigned char *)secret, hashlen);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX,
(unsigned char *)label_prefix,
sizeof(label_prefix) - 1);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL,
(unsigned char *)label, labellen);
if (data != NULL)
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_DATA,
(unsigned char *)data,
datalen);
*p++ = OSSL_PARAM_construct_end();
ret = EVP_KDF_derive(kctx, out, outlen, params) <= 0;
EVP_KDF_CTX_free(kctx);
if (ret != 0) {
if (raise_error)
ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
}
return ret == 0;
}
int tls13_hkdf_expand(SSL_CONNECTION *s, const EVP_MD *md,
const unsigned char *secret,
const unsigned char *label, size_t labellen,
const unsigned char *data, size_t datalen,
unsigned char *out, size_t outlen, int fatal)
{
int ret;
SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
ret = tls13_hkdf_expand_ex(sctx->libctx, sctx->propq, md,
secret, label, labellen, data, datalen,
out, outlen, !fatal);
if (ret == 0 && fatal)
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return ret;
}
/*
* Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
* success 0 on failure.
*/
int tls13_derive_key(SSL_CONNECTION *s, const EVP_MD *md,
const unsigned char *secret,
unsigned char *key, size_t keylen)
{
/* ASCII: "key", in hex for EBCDIC compatibility */
static const unsigned char keylabel[] = "\x6B\x65\x79";
return tls13_hkdf_expand(s, md, secret, keylabel, sizeof(keylabel) - 1,
NULL, 0, key, keylen, 1);
}
/*
* Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
* success 0 on failure.
*/
int tls13_derive_iv(SSL_CONNECTION *s, const EVP_MD *md,
const unsigned char *secret,
unsigned char *iv, size_t ivlen)
{
/* ASCII: "iv", in hex for EBCDIC compatibility */
static const unsigned char ivlabel[] = "\x69\x76";
return tls13_hkdf_expand(s, md, secret, ivlabel, sizeof(ivlabel) - 1,
NULL, 0, iv, ivlen, 1);
}
int tls13_derive_finishedkey(SSL_CONNECTION *s, const EVP_MD *md,
const unsigned char *secret,
unsigned char *fin, size_t finlen)
{
/* ASCII: "finished", in hex for EBCDIC compatibility */
static const unsigned char finishedlabel[] = "\x66\x69\x6E\x69\x73\x68\x65\x64";
return tls13_hkdf_expand(s, md, secret, finishedlabel,
sizeof(finishedlabel) - 1, NULL, 0, fin, finlen, 1);
}
/*
* Given the previous secret |prevsecret| and a new input secret |insecret| of
* length |insecretlen|, generate a new secret and store it in the location
* pointed to by |outsecret|. Returns 1 on success 0 on failure.
*/
int tls13_generate_secret(SSL_CONNECTION *s, const EVP_MD *md,
const unsigned char *prevsecret,
const unsigned char *insecret,
size_t insecretlen,
unsigned char *outsecret)
{
size_t mdlen;
int mdleni;
int ret;
EVP_KDF *kdf;
EVP_KDF_CTX *kctx;
OSSL_PARAM params[7], *p = params;
int mode = EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY;
const char *mdname = EVP_MD_get0_name(md);
/* ASCII: "derived", in hex for EBCDIC compatibility */
static const char derived_secret_label[] = "\x64\x65\x72\x69\x76\x65\x64";
SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
kdf = EVP_KDF_fetch(sctx->libctx, OSSL_KDF_NAME_TLS1_3_KDF, sctx->propq);
kctx = EVP_KDF_CTX_new(kdf);
EVP_KDF_free(kdf);
if (kctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
mdleni = EVP_MD_get_size(md);
/* Ensure cast to size_t is safe */
if (!ossl_assert(mdleni >= 0)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
EVP_KDF_CTX_free(kctx);
return 0;
}
mdlen = (size_t)mdleni;
*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
(char *)mdname, 0);
if (insecret != NULL)
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
(unsigned char *)insecret,
insecretlen);
if (prevsecret != NULL)
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
(unsigned char *)prevsecret, mdlen);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PREFIX,
(unsigned char *)label_prefix,
sizeof(label_prefix) - 1);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_LABEL,
(unsigned char *)derived_secret_label,
sizeof(derived_secret_label) - 1);
*p++ = OSSL_PARAM_construct_end();
ret = EVP_KDF_derive(kctx, outsecret, mdlen, params) <= 0;
if (ret != 0)
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
EVP_KDF_CTX_free(kctx);
return ret == 0;
}
/*
* Given an input secret |insecret| of length |insecretlen| generate the
* handshake secret. This requires the early secret to already have been
* generated. Returns 1 on success 0 on failure.
*/
int tls13_generate_handshake_secret(SSL_CONNECTION *s,
const unsigned char *insecret,
size_t insecretlen)
{
/* Calls SSLfatal() if required */
return tls13_generate_secret(s, ssl_handshake_md(s), s->early_secret,
insecret, insecretlen,
(unsigned char *)&s->handshake_secret);
}
/*
* Given the handshake secret |prev| of length |prevlen| generate the master
* secret and store its length in |*secret_size|. Returns 1 on success 0 on
* failure.
*/
int tls13_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
unsigned char *prev, size_t prevlen,
size_t *secret_size)
{
const EVP_MD *md = ssl_handshake_md(s);
int md_size;
md_size = EVP_MD_get_size(md);
if (md_size <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
*secret_size = (size_t)md_size;
/* Calls SSLfatal() if required */
return tls13_generate_secret(s, md, prev, NULL, 0, out);
}
/*
* Generates the mac for the Finished message. Returns the length of the MAC or
* 0 on error.
*/
size_t tls13_final_finish_mac(SSL_CONNECTION *s, const char *str, size_t slen,
unsigned char *out)
{
const EVP_MD *md = ssl_handshake_md(s);
const char *mdname = EVP_MD_get0_name(md);
unsigned char hash[EVP_MAX_MD_SIZE];
unsigned char finsecret[EVP_MAX_MD_SIZE];
unsigned char *key = NULL;
size_t len = 0, hashlen;
OSSL_PARAM params[2], *p = params;
SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
if (md == NULL)
return 0;
/* Safe to cast away const here since we're not "getting" any data */
if (sctx->propq != NULL)
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_PROPERTIES,
(char *)sctx->propq,
0);
*p = OSSL_PARAM_construct_end();
if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
/* SSLfatal() already called */
goto err;
}
if (str == SSL_CONNECTION_GET_SSL(s)->method->ssl3_enc->server_finished_label) {
key = s->server_finished_secret;
} else if (SSL_IS_FIRST_HANDSHAKE(s)) {
key = s->client_finished_secret;
} else {
if (!tls13_derive_finishedkey(s, md,
s->client_app_traffic_secret,
finsecret, hashlen))
goto err;
key = finsecret;
}
if (!EVP_Q_mac(sctx->libctx, "HMAC", sctx->propq, mdname,
params, key, hashlen, hash, hashlen,
/* outsize as per sizeof(peer_finish_md) */
out, EVP_MAX_MD_SIZE * 2, &len)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
err:
OPENSSL_cleanse(finsecret, sizeof(finsecret));
return len;
}
/*
* There isn't really a key block in TLSv1.3, but we still need this function
* for initialising the cipher and hash. Returns 1 on success or 0 on failure.
*/
int tls13_setup_key_block(SSL_CONNECTION *s)
{
const EVP_CIPHER *c;
const EVP_MD *hash;
s->session->cipher = s->s3.tmp.new_cipher;
if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
NULL, NULL, NULL, 0)) {
/* Error is already recorded */
SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
return 0;
}
ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
s->s3.tmp.new_sym_enc = c;
ssl_evp_md_free(s->s3.tmp.new_hash);
s->s3.tmp.new_hash = hash;
return 1;
}
static int derive_secret_key_and_iv(SSL_CONNECTION *s, const EVP_MD *md,
const EVP_CIPHER *ciph,
const unsigned char *insecret,
const unsigned char *hash,
const unsigned char *label,
size_t labellen, unsigned char *secret,
unsigned char *key, size_t *keylen,
unsigned char *iv, size_t *ivlen,
size_t *taglen)
{
int hashleni = EVP_MD_get_size(md);
size_t hashlen;
int mode;
/* Ensure cast to size_t is safe */
if (!ossl_assert(hashleni >= 0)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
return 0;
}
hashlen = (size_t)hashleni;
if (!tls13_hkdf_expand(s, md, insecret, label, labellen, hash, hashlen,
secret, hashlen, 1)) {
/* SSLfatal() already called */
return 0;
}
*keylen = EVP_CIPHER_get_key_length(ciph);
mode = EVP_CIPHER_get_mode(ciph);
if (mode == EVP_CIPH_CCM_MODE) {
uint32_t algenc;
*ivlen = EVP_CCM_TLS_IV_LEN;
if (s->s3.tmp.new_cipher != NULL) {
algenc = s->s3.tmp.new_cipher->algorithm_enc;
} else if (s->session->cipher != NULL) {
/* We've not selected a cipher yet - we must be doing early data */
algenc = s->session->cipher->algorithm_enc;
} else if (s->psksession != NULL && s->psksession->cipher != NULL) {
/* We must be doing early data with out-of-band PSK */
algenc = s->psksession->cipher->algorithm_enc;
} else {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
return 0;
}
if (algenc & (SSL_AES128CCM8 | SSL_AES256CCM8))
*taglen = EVP_CCM8_TLS_TAG_LEN;
else
*taglen = EVP_CCM_TLS_TAG_LEN;
} else {
int iivlen;
if (mode == EVP_CIPH_GCM_MODE) {
*taglen = EVP_GCM_TLS_TAG_LEN;
} else {
/* CHACHA20P-POLY1305 */
*taglen = EVP_CHACHAPOLY_TLS_TAG_LEN;
}
iivlen = EVP_CIPHER_get_iv_length(ciph);
if (iivlen < 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
return 0;
}
*ivlen = iivlen;
}
if (!tls13_derive_key(s, md, secret, key, *keylen)
|| !tls13_derive_iv(s, md, secret, iv, *ivlen)) {
/* SSLfatal() already called */
return 0;
}
return 1;
}
int tls13_change_cipher_state(SSL_CONNECTION *s, int which)
{
/* ASCII: "c e traffic", in hex for EBCDIC compatibility */
static const unsigned char client_early_traffic[] = "\x63\x20\x65\x20\x74\x72\x61\x66\x66\x69\x63";
/* ASCII: "c hs traffic", in hex for EBCDIC compatibility */
static const unsigned char client_handshake_traffic[] = "\x63\x20\x68\x73\x20\x74\x72\x61\x66\x66\x69\x63";
/* ASCII: "c ap traffic", in hex for EBCDIC compatibility */
static const unsigned char client_application_traffic[] = "\x63\x20\x61\x70\x20\x74\x72\x61\x66\x66\x69\x63";
/* ASCII: "s hs traffic", in hex for EBCDIC compatibility */
static const unsigned char server_handshake_traffic[] = "\x73\x20\x68\x73\x20\x74\x72\x61\x66\x66\x69\x63";
/* ASCII: "s ap traffic", in hex for EBCDIC compatibility */
static const unsigned char server_application_traffic[] = "\x73\x20\x61\x70\x20\x74\x72\x61\x66\x66\x69\x63";
/* ASCII: "exp master", in hex for EBCDIC compatibility */
static const unsigned char exporter_master_secret[] = "\x65\x78\x70\x20\x6D\x61\x73\x74\x65\x72";
/* ASCII: "res master", in hex for EBCDIC compatibility */
static const unsigned char resumption_master_secret[] = "\x72\x65\x73\x20\x6D\x61\x73\x74\x65\x72";
/* ASCII: "e exp master", in hex for EBCDIC compatibility */
static const unsigned char early_exporter_master_secret[] = "\x65\x20\x65\x78\x70\x20\x6D\x61\x73\x74\x65\x72";
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char key[EVP_MAX_KEY_LENGTH];
unsigned char secret[EVP_MAX_MD_SIZE];
unsigned char hashval[EVP_MAX_MD_SIZE];
unsigned char *hash = hashval;
unsigned char *insecret;
unsigned char *finsecret = NULL;
const char *log_label = NULL;
int finsecretlen = 0;
const unsigned char *label;
size_t labellen, hashlen = 0;
int ret = 0;
const EVP_MD *md = NULL;
const EVP_CIPHER *cipher = NULL;
SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
size_t keylen, ivlen, taglen;
int level;
int direction = (which & SSL3_CC_READ) != 0 ? OSSL_RECORD_DIRECTION_READ
: OSSL_RECORD_DIRECTION_WRITE;
if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
|| ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
if (which & SSL3_CC_EARLY) {
EVP_MD_CTX *mdctx = NULL;
long handlen;
void *hdata;
unsigned int hashlenui;
const SSL_CIPHER *sslcipher = SSL_SESSION_get0_cipher(s->session);
insecret = s->early_secret;
label = client_early_traffic;
labellen = sizeof(client_early_traffic) - 1;
log_label = CLIENT_EARLY_LABEL;
handlen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
if (handlen <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
goto err;
}
if (s->early_data_state == SSL_EARLY_DATA_CONNECTING
&& s->max_early_data > 0
&& s->session->ext.max_early_data == 0) {
/*
* If we are attempting to send early data, and we've decided to
* actually do it but max_early_data in s->session is 0 then we
* must be using an external PSK.
*/
if (!ossl_assert(s->psksession != NULL
&& s->max_early_data ==
s->psksession->ext.max_early_data)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
sslcipher = SSL_SESSION_get0_cipher(s->psksession);
}
if (sslcipher == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_PSK);
goto err;
}
/*
* We need to calculate the handshake digest using the digest from
* the session. We haven't yet selected our ciphersuite so we can't
* use ssl_handshake_md().
*/
mdctx = EVP_MD_CTX_new();
if (mdctx == NULL) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
goto err;
}
/*
* This ups the ref count on cipher so we better make sure we free
* it again
*/
if (!ssl_cipher_get_evp_cipher(sctx, sslcipher, &cipher)) {
/* Error is already recorded */
SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
EVP_MD_CTX_free(mdctx);
goto err;
}
md = ssl_md(sctx, sslcipher->algorithm2);
if (md == NULL || !EVP_DigestInit_ex(mdctx, md, NULL)
|| !EVP_DigestUpdate(mdctx, hdata, handlen)
|| !EVP_DigestFinal_ex(mdctx, hashval, &hashlenui)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
EVP_MD_CTX_free(mdctx);
goto err;
}
hashlen = hashlenui;
EVP_MD_CTX_free(mdctx);
if (!tls13_hkdf_expand(s, md, insecret,
early_exporter_master_secret,
sizeof(early_exporter_master_secret) - 1,
hashval, hashlen,
s->early_exporter_master_secret, hashlen,
1)) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
if (!ssl_log_secret(s, EARLY_EXPORTER_SECRET_LABEL,
s->early_exporter_master_secret, hashlen)) {
/* SSLfatal() already called */
goto err;
}
} else if (which & SSL3_CC_HANDSHAKE) {
insecret = s->handshake_secret;
finsecret = s->client_finished_secret;
finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
if (finsecretlen <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
label = client_handshake_traffic;
labellen = sizeof(client_handshake_traffic) - 1;
log_label = CLIENT_HANDSHAKE_LABEL;
/*
* The handshake hash used for the server read/client write handshake
* traffic secret is the same as the hash for the server
* write/client read handshake traffic secret. However, if we
* processed early data then we delay changing the server
* read/client write cipher state until later, and the handshake
* hashes have moved on. Therefore we use the value saved earlier
* when we did the server write/client read change cipher state.
*/
hash = s->handshake_traffic_hash;
} else {
insecret = s->master_secret;
label = client_application_traffic;
labellen = sizeof(client_application_traffic) - 1;
log_label = CLIENT_APPLICATION_LABEL;
/*
* For this we only use the handshake hashes up until the server
* Finished hash. We do not include the client's Finished, which is
* what ssl_handshake_hash() would give us. Instead we use the
* previously saved value.
*/
hash = s->server_finished_hash;
}
} else {
/* Early data never applies to client-read/server-write */
if (which & SSL3_CC_HANDSHAKE) {
insecret = s->handshake_secret;
finsecret = s->server_finished_secret;
finsecretlen = EVP_MD_get_size(ssl_handshake_md(s));
if (finsecretlen <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
}
label = server_handshake_traffic;
labellen = sizeof(server_handshake_traffic) - 1;
log_label = SERVER_HANDSHAKE_LABEL;
} else {
insecret = s->master_secret;
label = server_application_traffic;
labellen = sizeof(server_application_traffic) - 1;
log_label = SERVER_APPLICATION_LABEL;
}
}
if (!(which & SSL3_CC_EARLY)) {
md = ssl_handshake_md(s);
cipher = s->s3.tmp.new_sym_enc;
if (!ssl3_digest_cached_records(s, 1)
|| !ssl_handshake_hash(s, hashval, sizeof(hashval), &hashlen)) {
/* SSLfatal() already called */;
goto err;
}
}
/*
* Save the hash of handshakes up to now for use when we calculate the
* client application traffic secret
*/
if (label == server_application_traffic)
memcpy(s->server_finished_hash, hashval, hashlen);
if (label == server_handshake_traffic)
memcpy(s->handshake_traffic_hash, hashval, hashlen);
if (label == client_application_traffic) {
/*
* We also create the resumption master secret, but this time use the
* hash for the whole handshake including the Client Finished
*/
if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
resumption_master_secret,
sizeof(resumption_master_secret) - 1,
hashval, hashlen, s->resumption_master_secret,
hashlen, 1)) {
/* SSLfatal() already called */
goto err;
}
}
/* check whether cipher is known */
if (!ossl_assert(cipher != NULL))
goto err;
if (!derive_secret_key_and_iv(s, md, cipher,
insecret, hash, label, labellen, secret, key,
&keylen, iv, &ivlen, &taglen)) {
/* SSLfatal() already called */
goto err;
}
if (label == server_application_traffic) {
memcpy(s->server_app_traffic_secret, secret, hashlen);
/* Now we create the exporter master secret */
if (!tls13_hkdf_expand(s, ssl_handshake_md(s), insecret,
exporter_master_secret,
sizeof(exporter_master_secret) - 1,
hash, hashlen, s->exporter_master_secret,
hashlen, 1)) {
/* SSLfatal() already called */
goto err;
}
if (!ssl_log_secret(s, EXPORTER_SECRET_LABEL, s->exporter_master_secret,
hashlen)) {
/* SSLfatal() already called */
goto err;
}
} else if (label == client_application_traffic)
memcpy(s->client_app_traffic_secret, secret, hashlen);
if (!ssl_log_secret(s, log_label, secret, hashlen)) {
/* SSLfatal() already called */
goto err;
}
if (finsecret != NULL
&& !tls13_derive_finishedkey(s, ssl_handshake_md(s), secret,
finsecret, (size_t)finsecretlen)) {
/* SSLfatal() already called */
goto err;
}
if ((which & SSL3_CC_WRITE) != 0) {
if (!s->server && label == client_early_traffic)
s->rlayer.wrlmethod->set_plain_alerts(s->rlayer.wrl, 1);
else
s->rlayer.wrlmethod->set_plain_alerts(s->rlayer.wrl, 0);
}
level = (which & SSL3_CC_EARLY) != 0
? OSSL_RECORD_PROTECTION_LEVEL_EARLY
: ((which &SSL3_CC_HANDSHAKE) != 0
? OSSL_RECORD_PROTECTION_LEVEL_HANDSHAKE
: OSSL_RECORD_PROTECTION_LEVEL_APPLICATION);
if (!ssl_set_new_record_layer(s, s->version,
direction,
level, secret, hashlen, key, keylen, iv,
ivlen, NULL, 0, cipher, taglen, NID_undef,
NULL, NULL, md)) {
/* SSLfatal already called */
goto err;
}
ret = 1;
err:
if ((which & SSL3_CC_EARLY) != 0) {
/* We up-refed this so now we need to down ref */
ssl_evp_cipher_free(cipher);
}
OPENSSL_cleanse(key, sizeof(key));
OPENSSL_cleanse(secret, sizeof(secret));
return ret;
}
int tls13_update_key(SSL_CONNECTION *s, int sending)
{
/* ASCII: "traffic upd", in hex for EBCDIC compatibility */
static const unsigned char application_traffic[] = "\x74\x72\x61\x66\x66\x69\x63\x20\x75\x70\x64";
const EVP_MD *md = ssl_handshake_md(s);
size_t hashlen;
unsigned char key[EVP_MAX_KEY_LENGTH];
unsigned char *insecret;
unsigned char secret[EVP_MAX_MD_SIZE];
char *log_label;
size_t keylen, ivlen, taglen;
int ret = 0, l;
int direction = sending ? OSSL_RECORD_DIRECTION_WRITE
: OSSL_RECORD_DIRECTION_READ;
unsigned char iv[EVP_MAX_IV_LENGTH];
if ((l = EVP_MD_get_size(md)) <= 0) {
SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
return 0;
}
hashlen = (size_t)l;
if (s->server == sending)
insecret = s->server_app_traffic_secret;
else
insecret = s->client_app_traffic_secret;
if (!derive_secret_key_and_iv(s, md,
s->s3.tmp.new_sym_enc, insecret, NULL,
application_traffic,
sizeof(application_traffic) - 1, secret, key,
&keylen, iv, &ivlen, &taglen)) {
/* SSLfatal() already called */
goto err;
}
memcpy(insecret, secret, hashlen);
if (!ssl_set_new_record_layer(s, s->version,
direction,
OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
insecret, hashlen, key, keylen, iv, ivlen, NULL, 0,
s->s3.tmp.new_sym_enc, taglen, NID_undef, NULL,
NULL, md)) {
/* SSLfatal already called */
goto err;
}
/* Call Key log on successful traffic secret update */
log_label = s->server == sending ? SERVER_APPLICATION_N_LABEL : CLIENT_APPLICATION_N_LABEL;
if (!ssl_log_secret(s, log_label, secret, hashlen)) {
/* SSLfatal() already called */
goto err;
}
ret = 1;
err:
OPENSSL_cleanse(key, sizeof(key));
OPENSSL_cleanse(secret, sizeof(secret));
return ret;
}
int tls13_alert_code(int code)
{
/* There are 2 additional alerts in TLSv1.3 compared to TLSv1.2 */
if (code == SSL_AD_MISSING_EXTENSION || code == SSL_AD_CERTIFICATE_REQUIRED)
return code;
return tls1_alert_code(code);
}
int tls13_export_keying_material(SSL_CONNECTION *s,
unsigned char *out, size_t olen,
const char *label, size_t llen,
const unsigned char *context,
size_t contextlen, int use_context)
{
unsigned char exportsecret[EVP_MAX_MD_SIZE];
/* ASCII: "exporter", in hex for EBCDIC compatibility */
static const unsigned char exporterlabel[] = "\x65\x78\x70\x6F\x72\x74\x65\x72";
unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
const EVP_MD *md = ssl_handshake_md(s);
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
unsigned int hashsize, datalen;
int ret = 0;
if (ctx == NULL || md == NULL || !ossl_statem_export_allowed(s))
goto err;
if (!use_context)
contextlen = 0;
if (EVP_DigestInit_ex(ctx, md, NULL) <= 0
|| EVP_DigestUpdate(ctx, context, contextlen) <= 0
|| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
|| EVP_DigestInit_ex(ctx, md, NULL) <= 0
|| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
|| !tls13_hkdf_expand(s, md, s->exporter_master_secret,
(const unsigned char *)label, llen,
data, datalen, exportsecret, hashsize, 0)
|| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
sizeof(exporterlabel) - 1, hash, hashsize,
out, olen, 0))
goto err;
ret = 1;
err:
EVP_MD_CTX_free(ctx);
return ret;
}
int tls13_export_keying_material_early(SSL_CONNECTION *s,
unsigned char *out, size_t olen,
const char *label, size_t llen,
const unsigned char *context,
size_t contextlen)
{
/* ASCII: "exporter", in hex for EBCDIC compatibility */
static const unsigned char exporterlabel[] = "\x65\x78\x70\x6F\x72\x74\x65\x72";
unsigned char exportsecret[EVP_MAX_MD_SIZE];
unsigned char hash[EVP_MAX_MD_SIZE], data[EVP_MAX_MD_SIZE];
const EVP_MD *md;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
unsigned int hashsize, datalen;
int ret = 0;
const SSL_CIPHER *sslcipher;
if (ctx == NULL || !ossl_statem_export_early_allowed(s))
goto err;
if (!s->server && s->max_early_data > 0
&& s->session->ext.max_early_data == 0)
sslcipher = SSL_SESSION_get0_cipher(s->psksession);
else
sslcipher = SSL_SESSION_get0_cipher(s->session);
md = ssl_md(SSL_CONNECTION_GET_CTX(s), sslcipher->algorithm2);
/*
* Calculate the hash value and store it in |data|. The reason why
* the empty string is used is that the definition of TLS-Exporter
* is like so:
*
* TLS-Exporter(label, context_value, key_length) =
* HKDF-Expand-Label(Derive-Secret(Secret, label, ""),
* "exporter", Hash(context_value), key_length)
*
* Derive-Secret(Secret, Label, Messages) =
* HKDF-Expand-Label(Secret, Label,
* Transcript-Hash(Messages), Hash.length)
*
* Here Transcript-Hash is the cipher suite hash algorithm.
*/
if (md == NULL
|| EVP_DigestInit_ex(ctx, md, NULL) <= 0
|| EVP_DigestUpdate(ctx, context, contextlen) <= 0
|| EVP_DigestFinal_ex(ctx, hash, &hashsize) <= 0
|| EVP_DigestInit_ex(ctx, md, NULL) <= 0
|| EVP_DigestFinal_ex(ctx, data, &datalen) <= 0
|| !tls13_hkdf_expand(s, md, s->early_exporter_master_secret,
(const unsigned char *)label, llen,
data, datalen, exportsecret, hashsize, 0)
|| !tls13_hkdf_expand(s, md, exportsecret, exporterlabel,
sizeof(exporterlabel) - 1, hash, hashsize,
out, olen, 0))
goto err;
ret = 1;
err:
EVP_MD_CTX_free(ctx);
return ret;
}
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