1630 lines
56 KiB
C
1630 lines
56 KiB
C
/*
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* TLS 1.3 key schedule
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 ( the "License" ); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
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#include <stdint.h>
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#include <string.h>
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#include "mbedtls/hkdf.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/error.h"
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#include "mbedtls/platform.h"
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#include "ssl_misc.h"
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#include "ssl_tls13_keys.h"
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#include "ssl_tls13_invasive.h"
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#include "psa/crypto.h"
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#define MBEDTLS_SSL_TLS1_3_LABEL( name, string ) \
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.name = string,
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struct mbedtls_ssl_tls13_labels_struct const mbedtls_ssl_tls13_labels =
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{
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/* This seems to work in C, despite the string literal being one
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* character too long due to the 0-termination. */
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MBEDTLS_SSL_TLS1_3_LABEL_LIST
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};
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#undef MBEDTLS_SSL_TLS1_3_LABEL
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/*
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* This function creates a HkdfLabel structure used in the TLS 1.3 key schedule.
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*
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* The HkdfLabel is specified in RFC 8446 as follows:
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*
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* struct HkdfLabel {
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* uint16 length; // Length of expanded key material
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* opaque label<7..255>; // Always prefixed by "tls13 "
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* opaque context<0..255>; // Usually a communication transcript hash
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* };
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*
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* Parameters:
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* - desired_length: Length of expanded key material
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* Even though the standard allows expansion to up to
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* 2**16 Bytes, TLS 1.3 never uses expansion to more than
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* 255 Bytes, so we require `desired_length` to be at most
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* 255. This allows us to save a few Bytes of code by
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* hardcoding the writing of the high bytes.
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* - (label, label_len): label + label length, without "tls13 " prefix
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* The label length MUST be less than or equal to
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* MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN
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* It is the caller's responsibility to ensure this.
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* All (label, label length) pairs used in TLS 1.3
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* can be obtained via MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN().
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* - (ctx, ctx_len): context + context length
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* The context length MUST be less than or equal to
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* MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN
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* It is the caller's responsibility to ensure this.
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* - dst: Target buffer for HkdfLabel structure,
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* This MUST be a writable buffer of size
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* at least SSL_TLS1_3_KEY_SCHEDULE_MAX_HKDF_LABEL_LEN Bytes.
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* - dst_len: Pointer at which to store the actual length of
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* the HkdfLabel structure on success.
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*/
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static const char tls13_label_prefix[6] = "tls13 ";
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#define SSL_TLS1_3_KEY_SCHEDULE_HKDF_LABEL_LEN( label_len, context_len ) \
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( 2 /* expansion length */ \
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+ 1 /* label length */ \
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+ label_len \
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+ 1 /* context length */ \
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+ context_len )
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#define SSL_TLS1_3_KEY_SCHEDULE_MAX_HKDF_LABEL_LEN \
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SSL_TLS1_3_KEY_SCHEDULE_HKDF_LABEL_LEN( \
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sizeof(tls13_label_prefix) + \
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MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN, \
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MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN )
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static void ssl_tls13_hkdf_encode_label(
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size_t desired_length,
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const unsigned char *label, size_t label_len,
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const unsigned char *ctx, size_t ctx_len,
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unsigned char *dst, size_t *dst_len )
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{
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size_t total_label_len =
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sizeof(tls13_label_prefix) + label_len;
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size_t total_hkdf_lbl_len =
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SSL_TLS1_3_KEY_SCHEDULE_HKDF_LABEL_LEN( total_label_len, ctx_len );
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unsigned char *p = dst;
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/* Add the size of the expanded key material.
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* We're hardcoding the high byte to 0 here assuming that we never use
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* TLS 1.3 HKDF key expansion to more than 255 Bytes. */
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#if MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN > 255
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#error "The implementation of ssl_tls13_hkdf_encode_label() is not fit for the \
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value of MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN"
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#endif
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*p++ = 0;
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*p++ = MBEDTLS_BYTE_0( desired_length );
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/* Add label incl. prefix */
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*p++ = MBEDTLS_BYTE_0( total_label_len );
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memcpy( p, tls13_label_prefix, sizeof(tls13_label_prefix) );
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p += sizeof(tls13_label_prefix);
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memcpy( p, label, label_len );
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p += label_len;
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/* Add context value */
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*p++ = MBEDTLS_BYTE_0( ctx_len );
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if( ctx_len != 0 )
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memcpy( p, ctx, ctx_len );
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/* Return total length to the caller. */
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*dst_len = total_hkdf_lbl_len;
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}
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MBEDTLS_STATIC_TESTABLE
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psa_status_t mbedtls_psa_hkdf_extract( psa_algorithm_t hash_alg,
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const unsigned char *salt, size_t salt_len,
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const unsigned char *ikm, size_t ikm_len,
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unsigned char *prk, size_t prk_size,
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size_t *prk_len )
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{
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unsigned char null_salt[PSA_MAC_MAX_SIZE] = { '\0' };
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mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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psa_status_t destroy_status = PSA_ERROR_CORRUPTION_DETECTED;
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psa_algorithm_t alg = PSA_ALG_HMAC( hash_alg );
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if( salt == NULL || salt_len == 0 )
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{
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size_t hash_len;
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if( salt_len != 0 )
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{
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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hash_len = PSA_HASH_LENGTH( alg );
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if( hash_len == 0 )
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{
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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/* salt_len <= sizeof( salt ) because
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PSA_HASH_LENGTH( alg ) <= PSA_MAC_MAX_SIZE. */
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salt = null_salt;
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salt_len = hash_len;
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}
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psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_MESSAGE );
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psa_set_key_algorithm( &attributes, alg );
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psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
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status = psa_import_key( &attributes, salt, salt_len, &key );
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if( status != PSA_SUCCESS )
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{
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goto cleanup;
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}
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status = psa_mac_compute( key, alg, ikm, ikm_len, prk, prk_size, prk_len );
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cleanup:
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destroy_status = psa_destroy_key( key );
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return( ( status == PSA_SUCCESS ) ? destroy_status : status );
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}
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MBEDTLS_STATIC_TESTABLE
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psa_status_t mbedtls_psa_hkdf_expand( psa_algorithm_t hash_alg,
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const unsigned char *prk, size_t prk_len,
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const unsigned char *info, size_t info_len,
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unsigned char *okm, size_t okm_len )
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{
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size_t hash_len;
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size_t where = 0;
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size_t n;
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size_t t_len = 0;
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size_t i;
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mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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psa_status_t destroy_status = PSA_ERROR_CORRUPTION_DETECTED;
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unsigned char t[PSA_MAC_MAX_SIZE];
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psa_algorithm_t alg = PSA_ALG_HMAC( hash_alg );
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if( okm == NULL )
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{
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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hash_len = PSA_HASH_LENGTH( alg );
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if( prk_len < hash_len || hash_len == 0 )
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{
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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if( info == NULL )
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{
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info = (const unsigned char *) "";
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info_len = 0;
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}
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n = okm_len / hash_len;
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if( okm_len % hash_len != 0 )
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{
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n++;
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}
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/*
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* Per RFC 5869 Section 2.3, okm_len must not exceed
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* 255 times the hash length
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*/
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if( n > 255 )
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{
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_MESSAGE );
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psa_set_key_algorithm( &attributes, alg );
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psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
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status = psa_import_key( &attributes, prk, prk_len, &key );
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if( status != PSA_SUCCESS )
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{
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goto cleanup;
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}
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memset( t, 0, hash_len );
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/*
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* Compute T = T(1) | T(2) | T(3) | ... | T(N)
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* Where T(N) is defined in RFC 5869 Section 2.3
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*/
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for( i = 1; i <= n; i++ )
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{
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size_t num_to_copy;
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unsigned char c = i & 0xff;
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size_t len;
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status = psa_mac_sign_setup( &operation, key, alg );
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if( status != PSA_SUCCESS )
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{
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goto cleanup;
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}
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status = psa_mac_update( &operation, t, t_len );
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if( status != PSA_SUCCESS )
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{
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goto cleanup;
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}
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status = psa_mac_update( &operation, info, info_len );
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if( status != PSA_SUCCESS )
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{
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goto cleanup;
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}
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/* The constant concatenated to the end of each T(n) is a single octet. */
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status = psa_mac_update( &operation, &c, 1 );
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if( status != PSA_SUCCESS )
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{
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goto cleanup;
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}
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status = psa_mac_sign_finish( &operation, t, PSA_MAC_MAX_SIZE, &len );
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if( status != PSA_SUCCESS )
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{
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goto cleanup;
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}
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num_to_copy = i != n ? hash_len : okm_len - where;
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memcpy( okm + where, t, num_to_copy );
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where += hash_len;
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t_len = hash_len;
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}
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cleanup:
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if( status != PSA_SUCCESS )
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psa_mac_abort( &operation );
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destroy_status = psa_destroy_key( key );
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mbedtls_platform_zeroize( t, sizeof( t ) );
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return( ( status == PSA_SUCCESS ) ? destroy_status : status );
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}
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int mbedtls_ssl_tls13_hkdf_expand_label(
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psa_algorithm_t hash_alg,
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const unsigned char *secret, size_t secret_len,
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const unsigned char *label, size_t label_len,
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const unsigned char *ctx, size_t ctx_len,
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unsigned char *buf, size_t buf_len )
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{
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unsigned char hkdf_label[ SSL_TLS1_3_KEY_SCHEDULE_MAX_HKDF_LABEL_LEN ];
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size_t hkdf_label_len;
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if( label_len > MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN )
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{
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/* Should never happen since this is an internal
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* function, and we know statically which labels
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* are allowed. */
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return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
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}
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if( ctx_len > MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN )
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{
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/* Should not happen, as above. */
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return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
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}
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if( buf_len > MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN )
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{
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/* Should not happen, as above. */
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return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
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}
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if( ! PSA_ALG_IS_HASH( hash_alg ) )
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return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
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ssl_tls13_hkdf_encode_label( buf_len,
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label, label_len,
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ctx, ctx_len,
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hkdf_label,
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&hkdf_label_len );
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return( psa_ssl_status_to_mbedtls(
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mbedtls_psa_hkdf_expand( hash_alg,
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secret, secret_len,
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hkdf_label, hkdf_label_len,
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buf, buf_len ) ) );
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}
|
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|
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/*
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* The traffic keying material is generated from the following inputs:
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*
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* - One secret value per sender.
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* - A purpose value indicating the specific value being generated
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* - The desired lengths of key and IV.
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*
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* The expansion itself is based on HKDF:
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*
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* [sender]_write_key = HKDF-Expand-Label( Secret, "key", "", key_length )
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* [sender]_write_iv = HKDF-Expand-Label( Secret, "iv" , "", iv_length )
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*
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* [sender] denotes the sending side and the Secret value is provided
|
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* by the function caller. Note that we generate server and client side
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* keys in a single function call.
|
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*/
|
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int mbedtls_ssl_tls13_make_traffic_keys(
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psa_algorithm_t hash_alg,
|
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const unsigned char *client_secret,
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const unsigned char *server_secret, size_t secret_len,
|
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size_t key_len, size_t iv_len,
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mbedtls_ssl_key_set *keys )
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{
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int ret = 0;
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ret = mbedtls_ssl_tls13_hkdf_expand_label( hash_alg,
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client_secret, secret_len,
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MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( key ),
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NULL, 0,
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keys->client_write_key, key_len );
|
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if( ret != 0 )
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return( ret );
|
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|
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ret = mbedtls_ssl_tls13_hkdf_expand_label( hash_alg,
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server_secret, secret_len,
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MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( key ),
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NULL, 0,
|
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keys->server_write_key, key_len );
|
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if( ret != 0 )
|
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return( ret );
|
|
|
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ret = mbedtls_ssl_tls13_hkdf_expand_label( hash_alg,
|
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client_secret, secret_len,
|
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MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( iv ),
|
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NULL, 0,
|
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keys->client_write_iv, iv_len );
|
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if( ret != 0 )
|
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return( ret );
|
|
|
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ret = mbedtls_ssl_tls13_hkdf_expand_label( hash_alg,
|
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server_secret, secret_len,
|
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MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( iv ),
|
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NULL, 0,
|
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keys->server_write_iv, iv_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
keys->key_len = key_len;
|
|
keys->iv_len = iv_len;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_derive_secret(
|
|
psa_algorithm_t hash_alg,
|
|
const unsigned char *secret, size_t secret_len,
|
|
const unsigned char *label, size_t label_len,
|
|
const unsigned char *ctx, size_t ctx_len,
|
|
int ctx_hashed,
|
|
unsigned char *dstbuf, size_t dstbuf_len )
|
|
{
|
|
int ret;
|
|
unsigned char hashed_context[ PSA_HASH_MAX_SIZE ];
|
|
if( ctx_hashed == MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
status = psa_hash_compute( hash_alg, ctx, ctx_len, hashed_context,
|
|
PSA_HASH_LENGTH( hash_alg ), &ctx_len );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
return ret;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if( ctx_len > sizeof(hashed_context) )
|
|
{
|
|
/* This should never happen since this function is internal
|
|
* and the code sets `ctx_hashed` correctly.
|
|
* Let's double-check nonetheless to not run at the risk
|
|
* of getting a stack overflow. */
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
memcpy( hashed_context, ctx, ctx_len );
|
|
}
|
|
|
|
return( mbedtls_ssl_tls13_hkdf_expand_label( hash_alg,
|
|
secret, secret_len,
|
|
label, label_len,
|
|
hashed_context, ctx_len,
|
|
dstbuf, dstbuf_len ) );
|
|
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_evolve_secret(
|
|
psa_algorithm_t hash_alg,
|
|
const unsigned char *secret_old,
|
|
const unsigned char *input, size_t input_len,
|
|
unsigned char *secret_new )
|
|
{
|
|
int ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
|
|
size_t hlen, ilen;
|
|
unsigned char tmp_secret[ PSA_MAC_MAX_SIZE ] = { 0 };
|
|
unsigned char tmp_input [ MBEDTLS_ECP_MAX_BYTES ] = { 0 };
|
|
size_t secret_len;
|
|
|
|
if( ! PSA_ALG_IS_HASH( hash_alg ) )
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
|
|
hlen = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
/* For non-initial runs, call Derive-Secret( ., "derived", "")
|
|
* on the old secret. */
|
|
if( secret_old != NULL )
|
|
{
|
|
ret = mbedtls_ssl_tls13_derive_secret(
|
|
hash_alg,
|
|
secret_old, hlen,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( derived ),
|
|
NULL, 0, /* context */
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED,
|
|
tmp_secret, hlen );
|
|
if( ret != 0 )
|
|
goto cleanup;
|
|
}
|
|
|
|
if( input != NULL )
|
|
{
|
|
memcpy( tmp_input, input, input_len );
|
|
ilen = input_len;
|
|
}
|
|
else
|
|
{
|
|
ilen = hlen;
|
|
}
|
|
|
|
/* HKDF-Extract takes a salt and input key material.
|
|
* The salt is the old secret, and the input key material
|
|
* is the input secret (PSK / ECDHE). */
|
|
ret = psa_ssl_status_to_mbedtls(
|
|
mbedtls_psa_hkdf_extract( hash_alg,
|
|
tmp_secret, hlen,
|
|
tmp_input, ilen,
|
|
secret_new, hlen, &secret_len ) );
|
|
|
|
cleanup:
|
|
|
|
mbedtls_platform_zeroize( tmp_secret, sizeof(tmp_secret) );
|
|
mbedtls_platform_zeroize( tmp_input, sizeof(tmp_input) );
|
|
return( ret );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_derive_early_secrets(
|
|
psa_algorithm_t hash_alg,
|
|
unsigned char const *early_secret,
|
|
unsigned char const *transcript, size_t transcript_len,
|
|
mbedtls_ssl_tls13_early_secrets *derived )
|
|
{
|
|
int ret;
|
|
size_t const hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
/* We should never call this function with an unknown hash,
|
|
* but add an assertion anyway. */
|
|
if( ! PSA_ALG_IS_HASH( hash_alg ) )
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
|
|
/*
|
|
* 0
|
|
* |
|
|
* v
|
|
* PSK -> HKDF-Extract = Early Secret
|
|
* |
|
|
* +-----> Derive-Secret(., "c e traffic", ClientHello)
|
|
* | = client_early_traffic_secret
|
|
* |
|
|
* +-----> Derive-Secret(., "e exp master", ClientHello)
|
|
* | = early_exporter_master_secret
|
|
* v
|
|
*/
|
|
|
|
/* Create client_early_traffic_secret */
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
early_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( c_e_traffic ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->client_early_traffic_secret,
|
|
hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
/* Create early exporter */
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
early_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( e_exp_master ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->early_exporter_master_secret,
|
|
hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_derive_handshake_secrets(
|
|
psa_algorithm_t hash_alg,
|
|
unsigned char const *handshake_secret,
|
|
unsigned char const *transcript, size_t transcript_len,
|
|
mbedtls_ssl_tls13_handshake_secrets *derived )
|
|
{
|
|
int ret;
|
|
size_t const hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
/* We should never call this function with an unknown hash,
|
|
* but add an assertion anyway. */
|
|
if( ! PSA_ALG_IS_HASH( hash_alg ) )
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
|
|
/*
|
|
*
|
|
* Handshake Secret
|
|
* |
|
|
* +-----> Derive-Secret( ., "c hs traffic",
|
|
* | ClientHello...ServerHello )
|
|
* | = client_handshake_traffic_secret
|
|
* |
|
|
* +-----> Derive-Secret( ., "s hs traffic",
|
|
* | ClientHello...ServerHello )
|
|
* | = server_handshake_traffic_secret
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Compute client_handshake_traffic_secret with
|
|
* Derive-Secret( ., "c hs traffic", ClientHello...ServerHello )
|
|
*/
|
|
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
handshake_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( c_hs_traffic ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->client_handshake_traffic_secret,
|
|
hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
/*
|
|
* Compute server_handshake_traffic_secret with
|
|
* Derive-Secret( ., "s hs traffic", ClientHello...ServerHello )
|
|
*/
|
|
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
handshake_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( s_hs_traffic ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->server_handshake_traffic_secret,
|
|
hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_derive_application_secrets(
|
|
psa_algorithm_t hash_alg,
|
|
unsigned char const *application_secret,
|
|
unsigned char const *transcript, size_t transcript_len,
|
|
mbedtls_ssl_tls13_application_secrets *derived )
|
|
{
|
|
int ret;
|
|
size_t const hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
/* We should never call this function with an unknown hash,
|
|
* but add an assertion anyway. */
|
|
if( ! PSA_ALG_IS_HASH( hash_alg ) )
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
|
|
/* Generate {client,server}_application_traffic_secret_0
|
|
*
|
|
* Master Secret
|
|
* |
|
|
* +-----> Derive-Secret( ., "c ap traffic",
|
|
* | ClientHello...server Finished )
|
|
* | = client_application_traffic_secret_0
|
|
* |
|
|
* +-----> Derive-Secret( ., "s ap traffic",
|
|
* | ClientHello...Server Finished )
|
|
* | = server_application_traffic_secret_0
|
|
* |
|
|
* +-----> Derive-Secret( ., "exp master",
|
|
* | ClientHello...server Finished)
|
|
* | = exporter_master_secret
|
|
*
|
|
*/
|
|
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
application_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( c_ap_traffic ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->client_application_traffic_secret_N,
|
|
hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
application_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( s_ap_traffic ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->server_application_traffic_secret_N,
|
|
hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
application_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( exp_master ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->exporter_master_secret,
|
|
hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/* Generate resumption_master_secret for use with the ticket exchange.
|
|
*
|
|
* This is not integrated with mbedtls_ssl_tls13_derive_application_secrets()
|
|
* because it uses the transcript hash up to and including ClientFinished. */
|
|
int mbedtls_ssl_tls13_derive_resumption_master_secret(
|
|
psa_algorithm_t hash_alg,
|
|
unsigned char const *application_secret,
|
|
unsigned char const *transcript, size_t transcript_len,
|
|
mbedtls_ssl_tls13_application_secrets *derived )
|
|
{
|
|
int ret;
|
|
size_t const hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
/* We should never call this function with an unknown hash,
|
|
* but add an assertion anyway. */
|
|
if( ! PSA_ALG_IS_HASH( hash_alg ) )
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
application_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( res_master ),
|
|
transcript, transcript_len,
|
|
MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED,
|
|
derived->resumption_master_secret,
|
|
hash_len );
|
|
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_key_schedule_stage_application( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
psa_algorithm_t const hash_alg = mbedtls_psa_translate_md(
|
|
handshake->ciphersuite_info->mac );
|
|
|
|
/*
|
|
* Compute MasterSecret
|
|
*/
|
|
ret = mbedtls_ssl_tls13_evolve_secret( hash_alg,
|
|
handshake->tls13_master_secrets.handshake,
|
|
NULL, 0,
|
|
handshake->tls13_master_secrets.app );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_evolve_secret", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Master secret",
|
|
handshake->tls13_master_secrets.app, PSA_HASH_LENGTH( hash_alg ) );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int ssl_tls13_calc_finished_core( psa_algorithm_t hash_alg,
|
|
unsigned char const *base_key,
|
|
unsigned char const *transcript,
|
|
unsigned char *dst,
|
|
size_t *dst_len )
|
|
{
|
|
mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
size_t hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
unsigned char finished_key[PSA_MAC_MAX_SIZE];
|
|
int ret;
|
|
psa_algorithm_t alg;
|
|
|
|
/* We should never call this function with an unknown hash,
|
|
* but add an assertion anyway. */
|
|
if( ! PSA_ALG_IS_HASH( hash_alg ) )
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
|
|
/* TLS 1.3 Finished message
|
|
*
|
|
* struct {
|
|
* opaque verify_data[Hash.length];
|
|
* } Finished;
|
|
*
|
|
* verify_data =
|
|
* HMAC( finished_key,
|
|
* Hash( Handshake Context +
|
|
* Certificate* +
|
|
* CertificateVerify* )
|
|
* )
|
|
*
|
|
* finished_key =
|
|
* HKDF-Expand-Label( BaseKey, "finished", "", Hash.length )
|
|
*/
|
|
|
|
ret = mbedtls_ssl_tls13_hkdf_expand_label(
|
|
hash_alg, base_key, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( finished ),
|
|
NULL, 0,
|
|
finished_key, hash_len );
|
|
if( ret != 0 )
|
|
goto exit;
|
|
|
|
alg = PSA_ALG_HMAC( hash_alg );
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_MESSAGE );
|
|
psa_set_key_algorithm( &attributes, alg );
|
|
psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
|
|
|
|
status = psa_import_key( &attributes, finished_key, hash_len, &key );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
goto exit;
|
|
}
|
|
|
|
status = psa_mac_compute( key, alg, transcript, hash_len,
|
|
dst, hash_len, dst_len );
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
|
|
exit:
|
|
|
|
status = psa_destroy_key( key );
|
|
if( ret == 0 )
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
|
|
mbedtls_platform_zeroize( finished_key, sizeof( finished_key ) );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_calculate_verify_data( mbedtls_ssl_context* ssl,
|
|
unsigned char* dst,
|
|
size_t dst_len,
|
|
size_t *actual_len,
|
|
int from )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
unsigned char transcript[MBEDTLS_TLS1_3_MD_MAX_SIZE];
|
|
size_t transcript_len;
|
|
|
|
unsigned char *base_key = NULL;
|
|
size_t base_key_len = 0;
|
|
mbedtls_ssl_tls13_handshake_secrets *tls13_hs_secrets =
|
|
&ssl->handshake->tls13_hs_secrets;
|
|
|
|
mbedtls_md_type_t const md_type = ssl->handshake->ciphersuite_info->mac;
|
|
|
|
psa_algorithm_t hash_alg = mbedtls_psa_translate_md(
|
|
ssl->handshake->ciphersuite_info->mac );
|
|
size_t const hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_tls13_calculate_verify_data" ) );
|
|
|
|
if( from == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
base_key = tls13_hs_secrets->client_handshake_traffic_secret;
|
|
base_key_len = sizeof( tls13_hs_secrets->client_handshake_traffic_secret );
|
|
}
|
|
else
|
|
{
|
|
base_key = tls13_hs_secrets->server_handshake_traffic_secret;
|
|
base_key_len = sizeof( tls13_hs_secrets->server_handshake_traffic_secret );
|
|
}
|
|
|
|
if( dst_len < hash_len )
|
|
{
|
|
ret = MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
|
|
goto exit;
|
|
}
|
|
|
|
ret = mbedtls_ssl_get_handshake_transcript( ssl, md_type,
|
|
transcript, sizeof( transcript ),
|
|
&transcript_len );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_get_handshake_transcript", ret );
|
|
goto exit;
|
|
}
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "handshake hash", transcript, transcript_len );
|
|
|
|
ret = ssl_tls13_calc_finished_core( hash_alg, base_key, transcript, dst, actual_len );
|
|
if( ret != 0 )
|
|
goto exit;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "verify_data for finished message", dst, hash_len );
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_tls13_calculate_verify_data" ) );
|
|
|
|
exit:
|
|
/* Erase handshake secrets */
|
|
mbedtls_platform_zeroize( base_key, base_key_len );
|
|
mbedtls_platform_zeroize( transcript, sizeof( transcript ) );
|
|
return( ret );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_create_psk_binder( mbedtls_ssl_context *ssl,
|
|
const psa_algorithm_t hash_alg,
|
|
unsigned char const *psk, size_t psk_len,
|
|
int psk_type,
|
|
unsigned char const *transcript,
|
|
unsigned char *result )
|
|
{
|
|
int ret = 0;
|
|
unsigned char binder_key[PSA_MAC_MAX_SIZE];
|
|
unsigned char early_secret[PSA_MAC_MAX_SIZE];
|
|
size_t const hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
size_t actual_len;
|
|
|
|
#if !defined(MBEDTLS_DEBUG_C)
|
|
ssl = NULL; /* make sure we don't use it except for debug */
|
|
((void) ssl);
|
|
#endif
|
|
|
|
/* We should never call this function with an unknown hash,
|
|
* but add an assertion anyway. */
|
|
if( ! PSA_ALG_IS_HASH( hash_alg ) )
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
|
|
/*
|
|
* 0
|
|
* |
|
|
* v
|
|
* PSK -> HKDF-Extract = Early Secret
|
|
* |
|
|
* +-----> Derive-Secret(., "ext binder" | "res binder", "")
|
|
* | = binder_key
|
|
* v
|
|
*/
|
|
|
|
ret = mbedtls_ssl_tls13_evolve_secret( hash_alg,
|
|
NULL, /* Old secret */
|
|
psk, psk_len, /* Input */
|
|
early_secret );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_evolve_secret", ret );
|
|
goto exit;
|
|
}
|
|
|
|
if( psk_type == MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION )
|
|
{
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
early_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( res_binder ),
|
|
NULL, 0, MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED,
|
|
binder_key, hash_len );
|
|
MBEDTLS_SSL_DEBUG_MSG( 4, ( "Derive Early Secret with 'res binder'" ) );
|
|
}
|
|
else
|
|
{
|
|
ret = mbedtls_ssl_tls13_derive_secret( hash_alg,
|
|
early_secret, hash_len,
|
|
MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( ext_binder ),
|
|
NULL, 0, MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED,
|
|
binder_key, hash_len );
|
|
MBEDTLS_SSL_DEBUG_MSG( 4, ( "Derive Early Secret with 'ext binder'" ) );
|
|
}
|
|
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_derive_secret", ret );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* The binding_value is computed in the same way as the Finished message
|
|
* but with the BaseKey being the binder_key.
|
|
*/
|
|
|
|
ret = ssl_tls13_calc_finished_core( hash_alg, binder_key, transcript,
|
|
result, &actual_len );
|
|
if( ret != 0 )
|
|
goto exit;
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "psk binder", result, actual_len );
|
|
|
|
exit:
|
|
|
|
mbedtls_platform_zeroize( early_secret, sizeof( early_secret ) );
|
|
mbedtls_platform_zeroize( binder_key, sizeof( binder_key ) );
|
|
return( ret );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_populate_transform( mbedtls_ssl_transform *transform,
|
|
int endpoint,
|
|
int ciphersuite,
|
|
mbedtls_ssl_key_set const *traffic_keys,
|
|
mbedtls_ssl_context *ssl /* DEBUG ONLY */ )
|
|
{
|
|
#if !defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
int ret;
|
|
mbedtls_cipher_info_t const *cipher_info;
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
|
|
unsigned char const *key_enc;
|
|
unsigned char const *iv_enc;
|
|
unsigned char const *key_dec;
|
|
unsigned char const *iv_dec;
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
psa_key_type_t key_type;
|
|
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
|
|
psa_algorithm_t alg;
|
|
size_t key_bits;
|
|
psa_status_t status = PSA_SUCCESS;
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_DEBUG_C)
|
|
ssl = NULL; /* make sure we don't use it except for those cases */
|
|
(void) ssl;
|
|
#endif
|
|
|
|
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite );
|
|
if( ciphersuite_info == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %d not found",
|
|
ciphersuite ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
#if !defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher );
|
|
if( cipher_info == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %u not found",
|
|
ciphersuite_info->cipher ) );
|
|
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
|
|
}
|
|
|
|
/*
|
|
* Setup cipher contexts in target transform
|
|
*/
|
|
if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
|
|
cipher_info ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
|
|
cipher_info ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
key_enc = traffic_keys->server_write_key;
|
|
key_dec = traffic_keys->client_write_key;
|
|
iv_enc = traffic_keys->server_write_iv;
|
|
iv_dec = traffic_keys->client_write_iv;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
key_enc = traffic_keys->client_write_key;
|
|
key_dec = traffic_keys->server_write_key;
|
|
iv_enc = traffic_keys->client_write_iv;
|
|
iv_dec = traffic_keys->server_write_iv;
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
{
|
|
/* should not happen */
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
memcpy( transform->iv_enc, iv_enc, traffic_keys->iv_len );
|
|
memcpy( transform->iv_dec, iv_dec, traffic_keys->iv_len );
|
|
|
|
#if !defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc,
|
|
key_enc, cipher_info->key_bitlen,
|
|
MBEDTLS_ENCRYPT ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
|
|
return( ret );
|
|
}
|
|
|
|
if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec,
|
|
key_dec, cipher_info->key_bitlen,
|
|
MBEDTLS_DECRYPT ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
/*
|
|
* Setup other fields in SSL transform
|
|
*/
|
|
|
|
if( ( ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ) != 0 )
|
|
transform->taglen = 8;
|
|
else
|
|
transform->taglen = 16;
|
|
|
|
transform->ivlen = traffic_keys->iv_len;
|
|
transform->maclen = 0;
|
|
transform->fixed_ivlen = transform->ivlen;
|
|
transform->tls_version = MBEDTLS_SSL_VERSION_TLS1_3;
|
|
|
|
/* We add the true record content type (1 Byte) to the plaintext and
|
|
* then pad to the configured granularity. The minimum length of the
|
|
* type-extended and padded plaintext is therefore the padding
|
|
* granularity. */
|
|
transform->minlen =
|
|
transform->taglen + MBEDTLS_SSL_CID_TLS1_3_PADDING_GRANULARITY;
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
/*
|
|
* Setup psa keys and alg
|
|
*/
|
|
if( ( status = mbedtls_ssl_cipher_to_psa( ciphersuite_info->cipher,
|
|
transform->taglen,
|
|
&alg,
|
|
&key_type,
|
|
&key_bits ) ) != PSA_SUCCESS )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_cipher_to_psa", psa_ssl_status_to_mbedtls( status ) );
|
|
return( psa_ssl_status_to_mbedtls( status ) );
|
|
}
|
|
|
|
transform->psa_alg = alg;
|
|
|
|
if ( alg != MBEDTLS_SSL_NULL_CIPHER )
|
|
{
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_ENCRYPT );
|
|
psa_set_key_algorithm( &attributes, alg );
|
|
psa_set_key_type( &attributes, key_type );
|
|
|
|
if( ( status = psa_import_key( &attributes,
|
|
key_enc,
|
|
PSA_BITS_TO_BYTES( key_bits ),
|
|
&transform->psa_key_enc ) ) != PSA_SUCCESS )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "psa_import_key", psa_ssl_status_to_mbedtls( status ) );
|
|
return( psa_ssl_status_to_mbedtls( status ) );
|
|
}
|
|
|
|
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_DECRYPT );
|
|
|
|
if( ( status = psa_import_key( &attributes,
|
|
key_dec,
|
|
PSA_BITS_TO_BYTES( key_bits ),
|
|
&transform->psa_key_dec ) ) != PSA_SUCCESS )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "psa_import_key", psa_ssl_status_to_mbedtls( status ) );
|
|
return( psa_ssl_status_to_mbedtls( status ) );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_key_schedule_stage_early( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
psa_algorithm_t hash_alg;
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
|
|
if( handshake->ciphersuite_info == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher suite info not found" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
hash_alg = mbedtls_psa_translate_md( handshake->ciphersuite_info->mac );
|
|
|
|
ret = mbedtls_ssl_tls13_evolve_secret( hash_alg, NULL, NULL, 0,
|
|
handshake->tls13_master_secrets.early );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_evolve_secret", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/* mbedtls_ssl_tls13_generate_handshake_keys() generates keys necessary for
|
|
* protecting the handshake messages, as described in Section 7 of TLS 1.3. */
|
|
int mbedtls_ssl_tls13_generate_handshake_keys( mbedtls_ssl_context *ssl,
|
|
mbedtls_ssl_key_set *traffic_keys )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
mbedtls_md_type_t md_type;
|
|
|
|
psa_algorithm_t hash_alg;
|
|
size_t hash_len;
|
|
|
|
unsigned char transcript[MBEDTLS_TLS1_3_MD_MAX_SIZE];
|
|
size_t transcript_len;
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
psa_key_type_t key_type;
|
|
psa_algorithm_t alg;
|
|
size_t key_bits;
|
|
size_t taglen;
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
#else
|
|
mbedtls_cipher_info_t const *cipher_info;
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
size_t key_len, iv_len;
|
|
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = handshake->ciphersuite_info;
|
|
mbedtls_ssl_tls13_handshake_secrets *tls13_hs_secrets = &handshake->tls13_hs_secrets;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_tls13_generate_handshake_keys" ) );
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
if( ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG )
|
|
taglen = 8;
|
|
else
|
|
taglen = 16;
|
|
|
|
status = mbedtls_ssl_cipher_to_psa( ciphersuite_info->cipher, taglen,
|
|
&alg, &key_type, &key_bits );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_cipher_to_psa", ret );
|
|
return ret;
|
|
}
|
|
|
|
key_len = PSA_BITS_TO_BYTES(key_bits);
|
|
|
|
if( PSA_ALG_IS_AEAD( alg ) )
|
|
iv_len = 12;
|
|
else
|
|
iv_len = PSA_CIPHER_IV_LENGTH( key_type, alg );
|
|
#else
|
|
cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher );
|
|
key_len = cipher_info->key_bitlen >> 3;
|
|
iv_len = cipher_info->iv_size;
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
md_type = ciphersuite_info->mac;
|
|
|
|
hash_alg = mbedtls_psa_translate_md( ciphersuite_info->mac );
|
|
hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
ret = mbedtls_ssl_get_handshake_transcript( ssl, md_type,
|
|
transcript,
|
|
sizeof( transcript ),
|
|
&transcript_len );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1,
|
|
"mbedtls_ssl_get_handshake_transcript",
|
|
ret );
|
|
return( ret );
|
|
}
|
|
|
|
ret = mbedtls_ssl_tls13_derive_handshake_secrets( hash_alg,
|
|
handshake->tls13_master_secrets.handshake,
|
|
transcript, transcript_len, tls13_hs_secrets );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_derive_handshake_secrets",
|
|
ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Client handshake traffic secret",
|
|
tls13_hs_secrets->client_handshake_traffic_secret,
|
|
hash_len );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Server handshake traffic secret",
|
|
tls13_hs_secrets->server_handshake_traffic_secret,
|
|
hash_len );
|
|
|
|
/*
|
|
* Export client handshake traffic secret
|
|
*/
|
|
if( ssl->f_export_keys != NULL )
|
|
{
|
|
ssl->f_export_keys( ssl->p_export_keys,
|
|
MBEDTLS_SSL_KEY_EXPORT_TLS1_3_CLIENT_HANDSHAKE_TRAFFIC_SECRET,
|
|
tls13_hs_secrets->client_handshake_traffic_secret,
|
|
hash_len,
|
|
handshake->randbytes,
|
|
handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN,
|
|
MBEDTLS_SSL_TLS_PRF_NONE /* TODO: FIX! */ );
|
|
|
|
ssl->f_export_keys( ssl->p_export_keys,
|
|
MBEDTLS_SSL_KEY_EXPORT_TLS1_3_SERVER_HANDSHAKE_TRAFFIC_SECRET,
|
|
tls13_hs_secrets->server_handshake_traffic_secret,
|
|
hash_len,
|
|
handshake->randbytes,
|
|
handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN,
|
|
MBEDTLS_SSL_TLS_PRF_NONE /* TODO: FIX! */ );
|
|
}
|
|
|
|
ret = mbedtls_ssl_tls13_make_traffic_keys( hash_alg,
|
|
tls13_hs_secrets->client_handshake_traffic_secret,
|
|
tls13_hs_secrets->server_handshake_traffic_secret,
|
|
hash_len, key_len, iv_len, traffic_keys );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_make_traffic_keys", ret );
|
|
goto exit;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "client_handshake write_key",
|
|
traffic_keys->client_write_key,
|
|
traffic_keys->key_len);
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "server_handshake write_key",
|
|
traffic_keys->server_write_key,
|
|
traffic_keys->key_len);
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "client_handshake write_iv",
|
|
traffic_keys->client_write_iv,
|
|
traffic_keys->iv_len);
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "server_handshake write_iv",
|
|
traffic_keys->server_write_iv,
|
|
traffic_keys->iv_len);
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_tls13_generate_handshake_keys" ) );
|
|
|
|
exit:
|
|
|
|
return( ret );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_key_schedule_stage_handshake( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED) && defined(MBEDTLS_ECDH_C)
|
|
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED && MBEDTLS_ECDH_C */
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
psa_algorithm_t const hash_alg = mbedtls_psa_translate_md(
|
|
handshake->ciphersuite_info->mac );
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED)
|
|
/*
|
|
* Compute ECDHE secret used to compute the handshake secret from which
|
|
* client_handshake_traffic_secret and server_handshake_traffic_secret
|
|
* are derived in the handshake secret derivation stage.
|
|
*/
|
|
if( mbedtls_ssl_tls13_ephemeral_enabled( ssl ) )
|
|
{
|
|
if( mbedtls_ssl_tls13_named_group_is_ecdhe( handshake->offered_group_id ) )
|
|
{
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
/* Compute ECDH shared secret. */
|
|
status = psa_raw_key_agreement(
|
|
PSA_ALG_ECDH, handshake->ecdh_psa_privkey,
|
|
handshake->ecdh_psa_peerkey, handshake->ecdh_psa_peerkey_len,
|
|
handshake->premaster, sizeof( handshake->premaster ),
|
|
&handshake->pmslen );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "psa_raw_key_agreement", ret );
|
|
return( ret );
|
|
}
|
|
|
|
status = psa_destroy_key( handshake->ecdh_psa_privkey );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "psa_destroy_key", ret );
|
|
return( ret );
|
|
}
|
|
|
|
handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
}
|
|
else if( mbedtls_ssl_tls13_named_group_is_dhe( handshake->offered_group_id ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHE not supported." ) );
|
|
return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
|
|
}
|
|
}
|
|
#else
|
|
return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED */
|
|
|
|
/*
|
|
* Compute the Handshake Secret
|
|
*/
|
|
ret = mbedtls_ssl_tls13_evolve_secret( hash_alg,
|
|
handshake->tls13_master_secrets.early,
|
|
handshake->premaster, handshake->pmslen,
|
|
handshake->tls13_master_secrets.handshake );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_evolve_secret", ret );
|
|
return( ret );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Handshake secret",
|
|
handshake->tls13_master_secrets.handshake,
|
|
PSA_HASH_LENGTH( hash_alg ) );
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED)
|
|
mbedtls_platform_zeroize( handshake->premaster, sizeof( handshake->premaster ) );
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED */
|
|
return( 0 );
|
|
}
|
|
|
|
/* Generate application traffic keys since any records following a 1-RTT Finished message
|
|
* MUST be encrypted under the application traffic key.
|
|
*/
|
|
int mbedtls_ssl_tls13_generate_application_keys(
|
|
mbedtls_ssl_context *ssl,
|
|
mbedtls_ssl_key_set *traffic_keys )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
|
|
/* Address at which to store the application secrets */
|
|
mbedtls_ssl_tls13_application_secrets * const app_secrets =
|
|
&ssl->session_negotiate->app_secrets;
|
|
|
|
/* Holding the transcript up to and including the ServerFinished */
|
|
unsigned char transcript[MBEDTLS_TLS1_3_MD_MAX_SIZE];
|
|
size_t transcript_len;
|
|
|
|
/* Variables relating to the hash for the chosen ciphersuite. */
|
|
mbedtls_md_type_t md_type;
|
|
|
|
psa_algorithm_t hash_alg;
|
|
size_t hash_len;
|
|
|
|
/* Variables relating to the cipher for the chosen ciphersuite. */
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
psa_key_type_t key_type;
|
|
psa_algorithm_t alg;
|
|
size_t key_bits;
|
|
size_t taglen;
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
#else
|
|
mbedtls_cipher_info_t const *cipher_info;
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
size_t key_len, iv_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive application traffic keys" ) );
|
|
|
|
/* Extract basic information about hash and ciphersuite */
|
|
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
if( handshake->ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG )
|
|
taglen = 8;
|
|
else
|
|
taglen = 16;
|
|
|
|
status = mbedtls_ssl_cipher_to_psa( handshake->ciphersuite_info->cipher,
|
|
taglen, &alg, &key_type, &key_bits );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_cipher_to_psa", ret );
|
|
goto cleanup;
|
|
}
|
|
|
|
key_len = PSA_BITS_TO_BYTES(key_bits);
|
|
|
|
if( PSA_ALG_IS_AEAD( alg ) )
|
|
iv_len = 12;
|
|
else
|
|
iv_len = PSA_CIPHER_IV_LENGTH( key_type, alg );
|
|
#else
|
|
cipher_info = mbedtls_cipher_info_from_type(
|
|
handshake->ciphersuite_info->cipher );
|
|
key_len = cipher_info->key_bitlen / 8;
|
|
iv_len = cipher_info->iv_size;
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
md_type = handshake->ciphersuite_info->mac;
|
|
|
|
hash_alg = mbedtls_psa_translate_md( handshake->ciphersuite_info->mac );
|
|
hash_len = PSA_HASH_LENGTH( hash_alg );
|
|
|
|
/* Compute current handshake transcript. It's the caller's responsibility
|
|
* to call this at the right time, that is, after the ServerFinished. */
|
|
|
|
ret = mbedtls_ssl_get_handshake_transcript( ssl, md_type,
|
|
transcript, sizeof( transcript ),
|
|
&transcript_len );
|
|
if( ret != 0 )
|
|
goto cleanup;
|
|
|
|
/* Compute application secrets from master secret and transcript hash. */
|
|
|
|
ret = mbedtls_ssl_tls13_derive_application_secrets( hash_alg,
|
|
handshake->tls13_master_secrets.app,
|
|
transcript, transcript_len,
|
|
app_secrets );
|
|
/* Erase master secrets */
|
|
mbedtls_platform_zeroize( &ssl->handshake->tls13_master_secrets,
|
|
sizeof( ssl->handshake->tls13_master_secrets ) );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1,
|
|
"mbedtls_ssl_tls13_derive_application_secrets", ret );
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Derive first epoch of IV + Key for application traffic. */
|
|
|
|
ret = mbedtls_ssl_tls13_make_traffic_keys( hash_alg,
|
|
app_secrets->client_application_traffic_secret_N,
|
|
app_secrets->server_application_traffic_secret_N,
|
|
hash_len, key_len, iv_len, traffic_keys );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_make_traffic_keys", ret );
|
|
goto cleanup;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Client application traffic secret",
|
|
app_secrets->client_application_traffic_secret_N,
|
|
hash_len );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Server application traffic secret",
|
|
app_secrets->server_application_traffic_secret_N,
|
|
hash_len );
|
|
|
|
/*
|
|
* Export client/server application traffic secret 0
|
|
*/
|
|
if( ssl->f_export_keys != NULL )
|
|
{
|
|
ssl->f_export_keys( ssl->p_export_keys,
|
|
MBEDTLS_SSL_KEY_EXPORT_TLS1_3_CLIENT_APPLICATION_TRAFFIC_SECRET,
|
|
app_secrets->client_application_traffic_secret_N, hash_len,
|
|
handshake->randbytes,
|
|
handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN,
|
|
MBEDTLS_SSL_TLS_PRF_NONE /* TODO: this should be replaced by
|
|
a new constant for TLS 1.3! */ );
|
|
|
|
ssl->f_export_keys( ssl->p_export_keys,
|
|
MBEDTLS_SSL_KEY_EXPORT_TLS1_3_SERVER_APPLICATION_TRAFFIC_SECRET,
|
|
app_secrets->server_application_traffic_secret_N, hash_len,
|
|
handshake->randbytes,
|
|
handshake->randbytes + MBEDTLS_CLIENT_HELLO_RANDOM_LEN,
|
|
MBEDTLS_SSL_TLS_PRF_NONE /* TODO: this should be replaced by
|
|
a new constant for TLS 1.3! */ );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "client application_write_key:",
|
|
traffic_keys->client_write_key, key_len );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "server application write key",
|
|
traffic_keys->server_write_key, key_len );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "client application write IV",
|
|
traffic_keys->client_write_iv, iv_len );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "server application write IV",
|
|
traffic_keys->server_write_iv, iv_len );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive application traffic keys" ) );
|
|
|
|
cleanup:
|
|
/* randbytes is not used again */
|
|
mbedtls_platform_zeroize( ssl->handshake->randbytes,
|
|
sizeof( ssl->handshake->randbytes ) );
|
|
|
|
mbedtls_platform_zeroize( transcript, sizeof( transcript ) );
|
|
return( ret );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_compute_handshake_transform( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_ssl_key_set traffic_keys;
|
|
mbedtls_ssl_transform *transform_handshake = NULL;
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
|
|
/* Compute handshake secret */
|
|
ret = mbedtls_ssl_tls13_key_schedule_stage_handshake( ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_derive_master_secret", ret );
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Next evolution in key schedule: Establish handshake secret and
|
|
* key material. */
|
|
ret = mbedtls_ssl_tls13_generate_handshake_keys( ssl, &traffic_keys );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_generate_handshake_keys",
|
|
ret );
|
|
goto cleanup;
|
|
}
|
|
|
|
transform_handshake = mbedtls_calloc( 1, sizeof( mbedtls_ssl_transform ) );
|
|
if( transform_handshake == NULL )
|
|
{
|
|
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = mbedtls_ssl_tls13_populate_transform(
|
|
transform_handshake,
|
|
ssl->conf->endpoint,
|
|
ssl->session_negotiate->ciphersuite,
|
|
&traffic_keys,
|
|
ssl );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_populate_transform", ret );
|
|
goto cleanup;
|
|
}
|
|
handshake->transform_handshake = transform_handshake;
|
|
|
|
cleanup:
|
|
mbedtls_platform_zeroize( &traffic_keys, sizeof( traffic_keys ) );
|
|
if( ret != 0 )
|
|
mbedtls_free( transform_handshake );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
|