mirror of
https://github.com/openssl/openssl.git
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278 lines
9.3 KiB
C
278 lines
9.3 KiB
C
/*
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* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "internal/quic_record_util.h"
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#include "internal/quic_record_rx.h"
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#include "internal/quic_record_tx.h"
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#include "internal/quic_wire_pkt.h"
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#include "../ssl_local.h"
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#include <openssl/kdf.h>
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#include <openssl/core_names.h>
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/*
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* QUIC Key Derivation Utilities
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* =============================
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*/
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int ossl_quic_hkdf_extract(OSSL_LIB_CTX *libctx,
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const char *propq,
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const EVP_MD *md,
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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 *out, size_t out_len)
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{
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int ret = 0;
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EVP_KDF *kdf = NULL;
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EVP_KDF_CTX *kctx = NULL;
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OSSL_PARAM params[7], *p = params;
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int mode = EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY;
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const char *md_name;
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if ((md_name = EVP_MD_get0_name(md)) == NULL
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|| (kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_HKDF, propq)) == NULL
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|| (kctx = EVP_KDF_CTX_new(kdf)) == NULL)
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goto err;
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*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_MODE, &mode);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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(char *)md_name, 0);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
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(unsigned char *)salt, salt_len);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
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(unsigned char *)ikm, ikm_len);
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*p++ = OSSL_PARAM_construct_end();
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ret = EVP_KDF_derive(kctx, out, out_len, params);
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err:
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EVP_KDF_CTX_free(kctx);
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EVP_KDF_free(kdf);
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return ret;
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}
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/* Constants used for key derivation in QUIC v1. */
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static const unsigned char quic_client_in_label[] = {
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0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x20, 0x69, 0x6e /* "client in" */
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};
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static const unsigned char quic_server_in_label[] = {
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0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x69, 0x6e /* "server in" */
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};
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/* Salt used to derive Initial packet protection keys (RFC 9001 Section 5.2). */
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static const unsigned char quic_v1_initial_salt[] = {
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0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17,
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0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a
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};
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int ossl_quic_provide_initial_secret(OSSL_LIB_CTX *libctx,
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const char *propq,
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const QUIC_CONN_ID *dst_conn_id,
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int is_server,
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struct ossl_qrx_st *qrx,
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struct ossl_qtx_st *qtx)
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{
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unsigned char initial_secret[32];
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unsigned char client_initial_secret[32], server_initial_secret[32];
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unsigned char *rx_secret, *tx_secret;
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EVP_MD *sha256;
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if (qrx == NULL && qtx == NULL)
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return 1;
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/* Initial encryption always uses SHA-256. */
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if ((sha256 = EVP_MD_fetch(libctx, "SHA256", propq)) == NULL)
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return 0;
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if (is_server) {
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rx_secret = client_initial_secret;
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tx_secret = server_initial_secret;
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} else {
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rx_secret = server_initial_secret;
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tx_secret = client_initial_secret;
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}
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/* Derive initial secret from destination connection ID. */
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if (!ossl_quic_hkdf_extract(libctx, propq,
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sha256,
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quic_v1_initial_salt,
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sizeof(quic_v1_initial_salt),
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dst_conn_id->id,
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dst_conn_id->id_len,
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initial_secret,
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sizeof(initial_secret)))
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goto err;
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/* Derive "client in" secret. */
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if (((qtx != NULL && tx_secret == client_initial_secret)
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|| (qrx != NULL && rx_secret == client_initial_secret))
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&& !tls13_hkdf_expand_ex(libctx, propq,
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sha256,
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initial_secret,
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quic_client_in_label,
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sizeof(quic_client_in_label),
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NULL, 0,
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client_initial_secret,
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sizeof(client_initial_secret), 1))
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goto err;
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/* Derive "server in" secret. */
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if (((qtx != NULL && tx_secret == server_initial_secret)
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|| (qrx != NULL && rx_secret == server_initial_secret))
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&& !tls13_hkdf_expand_ex(libctx, propq,
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sha256,
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initial_secret,
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quic_server_in_label,
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sizeof(quic_server_in_label),
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NULL, 0,
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server_initial_secret,
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sizeof(server_initial_secret), 1))
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goto err;
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/* Setup RX EL. Initial encryption always uses AES-128-GCM. */
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if (qrx != NULL
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&& !ossl_qrx_provide_secret(qrx, QUIC_ENC_LEVEL_INITIAL,
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QRL_SUITE_AES128GCM,
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sha256,
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rx_secret,
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sizeof(server_initial_secret)))
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goto err;
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/*
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* ossl_qrx_provide_secret takes ownership of our ref to SHA256, so if we
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* are initialising both sides, get a new ref for the following call for the
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* TX side.
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*/
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if (qrx != NULL && qtx != NULL && !EVP_MD_up_ref(sha256)) {
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sha256 = NULL;
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goto err;
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}
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/* Setup TX cipher. */
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if (qtx != NULL
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&& !ossl_qtx_provide_secret(qtx, QUIC_ENC_LEVEL_INITIAL,
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QRL_SUITE_AES128GCM,
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sha256,
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tx_secret,
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sizeof(server_initial_secret)))
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goto err;
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return 1;
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err:
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EVP_MD_free(sha256);
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return 0;
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}
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/*
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* QUIC Record Layer Ciphersuite Info
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* ==================================
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*/
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struct suite_info {
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const char *cipher_name, *md_name;
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uint32_t secret_len, cipher_key_len, cipher_iv_len, cipher_tag_len;
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uint32_t hdr_prot_key_len, hdr_prot_cipher_id;
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uint64_t max_pkt, max_forged_pkt;
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};
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static const struct suite_info suite_aes128gcm = {
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"AES-128-GCM", "SHA256", 32, 16, 12, 16, 16,
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QUIC_HDR_PROT_CIPHER_AES_128,
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((uint64_t)1) << 23, /* Limits as prescribed by RFC 9001 */
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((uint64_t)1) << 52,
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};
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static const struct suite_info suite_aes256gcm = {
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"AES-256-GCM", "SHA384", 48, 32, 12, 16, 32,
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QUIC_HDR_PROT_CIPHER_AES_256,
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((uint64_t)1) << 23, /* Limits as prescribed by RFC 9001 */
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((uint64_t)1) << 52,
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};
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static const struct suite_info suite_chacha20poly1305 = {
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"ChaCha20-Poly1305", "SHA256", 32, 32, 12, 16, 32,
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QUIC_HDR_PROT_CIPHER_CHACHA,
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/* Do not use UINT64_MAX here as this represents an invalid value */
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UINT64_MAX - 1, /* No applicable limit for this suite (RFC 9001) */
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((uint64_t)1) << 36, /* Limit as prescribed by RFC 9001 */
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};
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static const struct suite_info *get_suite(uint32_t suite_id)
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{
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switch (suite_id) {
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case QRL_SUITE_AES128GCM:
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return &suite_aes128gcm;
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case QRL_SUITE_AES256GCM:
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return &suite_aes256gcm;
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case QRL_SUITE_CHACHA20POLY1305:
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return &suite_chacha20poly1305;
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default:
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return NULL;
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}
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}
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const char *ossl_qrl_get_suite_cipher_name(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->cipher_name : NULL;
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}
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const char *ossl_qrl_get_suite_md_name(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->md_name : NULL;
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}
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uint32_t ossl_qrl_get_suite_secret_len(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->secret_len : 0;
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}
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uint32_t ossl_qrl_get_suite_cipher_key_len(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->cipher_key_len : 0;
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}
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uint32_t ossl_qrl_get_suite_cipher_iv_len(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->cipher_iv_len : 0;
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}
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uint32_t ossl_qrl_get_suite_cipher_tag_len(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->cipher_tag_len : 0;
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}
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uint32_t ossl_qrl_get_suite_hdr_prot_cipher_id(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->hdr_prot_cipher_id : 0;
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}
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uint32_t ossl_qrl_get_suite_hdr_prot_key_len(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->hdr_prot_key_len : 0;
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}
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uint64_t ossl_qrl_get_suite_max_pkt(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->max_pkt : UINT64_MAX;
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}
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uint64_t ossl_qrl_get_suite_max_forged_pkt(uint32_t suite_id)
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{
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const struct suite_info *c = get_suite(suite_id);
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return c != NULL ? c->max_forged_pkt : UINT64_MAX;
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}
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