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/*
* ngtcp2
*
* Copyright (c) 2022 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <assert.h>
#include <ngtcp2/ngtcp2_crypto.h>
#include <ngtcp2/ngtcp2_crypto_wolfssl.h>
#include <wolfssl/ssl.h>
#include <wolfssl/quic.h>
#include "shared.h"
#define PRINTF_DEBUG 0
#if PRINTF_DEBUG
# define DEBUG_MSG(...) fprintf(stderr, __VA_ARGS__)
#else
# define DEBUG_MSG(...) (void)0
#endif
ngtcp2_crypto_aead *ngtcp2_crypto_aead_aes_128_gcm(ngtcp2_crypto_aead *aead) {
return ngtcp2_crypto_aead_init(aead, (void *)wolfSSL_EVP_aes_128_gcm());
}
ngtcp2_crypto_md *ngtcp2_crypto_md_sha256(ngtcp2_crypto_md *md) {
md->native_handle = (void *)wolfSSL_EVP_sha256();
return md;
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_initial(ngtcp2_crypto_ctx *ctx) {
ngtcp2_crypto_aead_init(&ctx->aead, (void *)wolfSSL_EVP_aes_128_gcm());
ctx->md.native_handle = (void *)wolfSSL_EVP_sha256();
ctx->hp.native_handle = (void *)wolfSSL_EVP_aes_128_ctr();
ctx->max_encryption = 0;
ctx->max_decryption_failure = 0;
return ctx;
}
ngtcp2_crypto_aead *ngtcp2_crypto_aead_init(ngtcp2_crypto_aead *aead,
void *aead_native_handle) {
aead->native_handle = aead_native_handle;
aead->max_overhead = wolfSSL_quic_get_aead_tag_len(
(const WOLFSSL_EVP_CIPHER *)(aead_native_handle));
return aead;
}
ngtcp2_crypto_aead *ngtcp2_crypto_aead_retry(ngtcp2_crypto_aead *aead) {
return ngtcp2_crypto_aead_init(aead, (void *)wolfSSL_EVP_aes_128_gcm());
}
static uint64_t crypto_wolfssl_get_aead_max_encryption(WOLFSSL *ssl) {
const WOLFSSL_EVP_CIPHER *aead = wolfSSL_quic_get_aead(ssl);
if (wolfSSL_quic_aead_is_gcm(aead)) {
return NGTCP2_CRYPTO_MAX_ENCRYPTION_AES_GCM;
}
if (wolfSSL_quic_aead_is_chacha20(aead)) {
return NGTCP2_CRYPTO_MAX_ENCRYPTION_CHACHA20_POLY1305;
}
if (wolfSSL_quic_aead_is_ccm(aead)) {
return NGTCP2_CRYPTO_MAX_ENCRYPTION_AES_CCM;
}
return 0;
}
static uint64_t crypto_wolfssl_get_aead_max_decryption_failure(WOLFSSL *ssl) {
const WOLFSSL_EVP_CIPHER *aead = wolfSSL_quic_get_aead(ssl);
if (wolfSSL_quic_aead_is_gcm(aead)) {
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_AES_GCM;
}
if (wolfSSL_quic_aead_is_chacha20(aead)) {
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_CHACHA20_POLY1305;
}
if (wolfSSL_quic_aead_is_ccm(aead)) {
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_AES_CCM;
}
return 0;
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_tls(ngtcp2_crypto_ctx *ctx,
void *tls_native_handle) {
WOLFSSL *ssl = tls_native_handle;
ngtcp2_crypto_aead_init(&ctx->aead, (void *)wolfSSL_quic_get_aead(ssl));
ctx->md.native_handle = (void *)wolfSSL_quic_get_md(ssl);
ctx->hp.native_handle = (void *)wolfSSL_quic_get_hp(ssl);
ctx->max_encryption = crypto_wolfssl_get_aead_max_encryption(ssl);
ctx->max_decryption_failure =
crypto_wolfssl_get_aead_max_decryption_failure(ssl);
return ctx;
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_tls_early(ngtcp2_crypto_ctx *ctx,
void *tls_native_handle) {
return ngtcp2_crypto_ctx_tls(ctx, tls_native_handle);
}
static size_t crypto_md_hashlen(const WOLFSSL_EVP_MD *md) {
return (size_t)wolfSSL_EVP_MD_size(md);
}
size_t ngtcp2_crypto_md_hashlen(const ngtcp2_crypto_md *md) {
return crypto_md_hashlen(md->native_handle);
}
static size_t crypto_aead_keylen(const WOLFSSL_EVP_CIPHER *aead) {
return (size_t)wolfSSL_EVP_Cipher_key_length(aead);
}
size_t ngtcp2_crypto_aead_keylen(const ngtcp2_crypto_aead *aead) {
return crypto_aead_keylen(aead->native_handle);
}
static size_t crypto_aead_noncelen(const WOLFSSL_EVP_CIPHER *aead) {
return (size_t)wolfSSL_EVP_CIPHER_iv_length(aead);
}
size_t ngtcp2_crypto_aead_noncelen(const ngtcp2_crypto_aead *aead) {
return crypto_aead_noncelen(aead->native_handle);
}
int ngtcp2_crypto_aead_ctx_encrypt_init(ngtcp2_crypto_aead_ctx *aead_ctx,
const ngtcp2_crypto_aead *aead,
const uint8_t *key, size_t noncelen) {
const WOLFSSL_EVP_CIPHER *cipher = aead->native_handle;
WOLFSSL_EVP_CIPHER_CTX *actx;
static const uint8_t iv[AES_BLOCK_SIZE] = {0};
(void)noncelen;
actx = wolfSSL_quic_crypt_new(cipher, key, iv, /* encrypt */ 1);
if (actx == NULL) {
return -1;
}
aead_ctx->native_handle = actx;
return 0;
}
int ngtcp2_crypto_aead_ctx_decrypt_init(ngtcp2_crypto_aead_ctx *aead_ctx,
const ngtcp2_crypto_aead *aead,
const uint8_t *key, size_t noncelen) {
const WOLFSSL_EVP_CIPHER *cipher = aead->native_handle;
WOLFSSL_EVP_CIPHER_CTX *actx;
static const uint8_t iv[AES_BLOCK_SIZE] = {0};
(void)noncelen;
actx = wolfSSL_quic_crypt_new(cipher, key, iv, /* encrypt */ 0);
if (actx == NULL) {
return -1;
}
aead_ctx->native_handle = actx;
return 0;
}
void ngtcp2_crypto_aead_ctx_free(ngtcp2_crypto_aead_ctx *aead_ctx) {
if (aead_ctx->native_handle) {
wolfSSL_EVP_CIPHER_CTX_free(aead_ctx->native_handle);
}
}
int ngtcp2_crypto_cipher_ctx_encrypt_init(ngtcp2_crypto_cipher_ctx *cipher_ctx,
const ngtcp2_crypto_cipher *cipher,
const uint8_t *key) {
WOLFSSL_EVP_CIPHER_CTX *actx;
actx =
wolfSSL_quic_crypt_new(cipher->native_handle, key, NULL, /* encrypt */ 1);
if (actx == NULL) {
return -1;
}
cipher_ctx->native_handle = actx;
return 0;
}
void ngtcp2_crypto_cipher_ctx_free(ngtcp2_crypto_cipher_ctx *cipher_ctx) {
if (cipher_ctx->native_handle) {
wolfSSL_EVP_CIPHER_CTX_free(cipher_ctx->native_handle);
}
}
int ngtcp2_crypto_hkdf_extract(uint8_t *dest, const ngtcp2_crypto_md *md,
const uint8_t *secret, size_t secretlen,
const uint8_t *salt, size_t saltlen) {
if (wolfSSL_quic_hkdf_extract(dest, md->native_handle, secret, secretlen,
salt, saltlen) != WOLFSSL_SUCCESS) {
return -1;
}
return 0;
}
int ngtcp2_crypto_hkdf_expand(uint8_t *dest, size_t destlen,
const ngtcp2_crypto_md *md, const uint8_t *secret,
size_t secretlen, const uint8_t *info,
size_t infolen) {
if (wolfSSL_quic_hkdf_expand(dest, destlen, md->native_handle, secret,
secretlen, info, infolen) != WOLFSSL_SUCCESS) {
return -1;
}
return 0;
}
int ngtcp2_crypto_hkdf(uint8_t *dest, size_t destlen,
const ngtcp2_crypto_md *md, const uint8_t *secret,
size_t secretlen, const uint8_t *salt, size_t saltlen,
const uint8_t *info, size_t infolen) {
if (wolfSSL_quic_hkdf(dest, destlen, md->native_handle, secret, secretlen,
salt, saltlen, info, infolen) != WOLFSSL_SUCCESS) {
return -1;
}
return 0;
}
int ngtcp2_crypto_encrypt(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *plaintext, size_t plaintextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *aad, size_t aadlen) {
(void)aead;
(void)noncelen;
if (wolfSSL_quic_aead_encrypt(dest, aead_ctx->native_handle, plaintext,
plaintextlen, nonce, aad,
aadlen) != WOLFSSL_SUCCESS) {
DEBUG_MSG("WOLFSSL: encrypt FAILED\n");
return -1;
}
return 0;
}
int ngtcp2_crypto_decrypt(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx,
const uint8_t *ciphertext, size_t ciphertextlen,
const uint8_t *nonce, size_t noncelen,
const uint8_t *aad, size_t aadlen) {
(void)aead;
(void)noncelen;
if (wolfSSL_quic_aead_decrypt(dest, aead_ctx->native_handle, ciphertext,
ciphertextlen, nonce, aad,
aadlen) != WOLFSSL_SUCCESS) {
DEBUG_MSG("WOLFSSL: decrypt FAILED\n");
return -1;
}
return 0;
}
int ngtcp2_crypto_hp_mask(uint8_t *dest, const ngtcp2_crypto_cipher *hp,
const ngtcp2_crypto_cipher_ctx *hp_ctx,
const uint8_t *sample) {
static const uint8_t PLAINTEXT[] = "\x00\x00\x00\x00\x00";
WOLFSSL_EVP_CIPHER_CTX *actx = hp_ctx->native_handle;
int len;
(void)hp;
if (wolfSSL_EVP_EncryptInit_ex(actx, NULL, NULL, NULL, sample) !=
WOLFSSL_SUCCESS ||
wolfSSL_EVP_CipherUpdate(actx, dest, &len, PLAINTEXT,
sizeof(PLAINTEXT) - 1) != WOLFSSL_SUCCESS ||
wolfSSL_EVP_EncryptFinal_ex(actx, dest + sizeof(PLAINTEXT) - 1, &len) !=
WOLFSSL_SUCCESS) {
return -1;
}
return 0;
}
int ngtcp2_crypto_read_write_crypto_data(ngtcp2_conn *conn,
ngtcp2_crypto_level crypto_level,
const uint8_t *data, size_t datalen) {
WOLFSSL *ssl = ngtcp2_conn_get_tls_native_handle(conn);
WOLFSSL_ENCRYPTION_LEVEL level =
ngtcp2_crypto_wolfssl_from_ngtcp2_crypto_level(crypto_level);
int rv;
int err;
DEBUG_MSG("WOLFSSL: read/write crypto data, level=%d len=%lu\n", level,
datalen);
if (datalen > 0) {
rv = wolfSSL_provide_quic_data(ssl, level, data, datalen);
if (rv != WOLFSSL_SUCCESS) {
DEBUG_MSG("WOLFSSL: read/write crypto data FAILED, rv=%d\n", rv);
return -1;
}
}
if (!ngtcp2_conn_get_handshake_completed(conn)) {
rv = wolfSSL_quic_do_handshake(ssl);
DEBUG_MSG("WOLFSSL: do_handshake, rv=%d\n", rv);
if (rv <= 0) {
err = wolfSSL_get_error(ssl, rv);
switch (err) {
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
return 0;
case SSL_ERROR_SSL:
return -1;
default:
return -1;
}
}
DEBUG_MSG("WOLFSSL: handshake done\n");
ngtcp2_conn_handshake_completed(conn);
}
rv = wolfSSL_process_quic_post_handshake(ssl);
DEBUG_MSG("WOLFSSL: process post handshake, rv=%d\n", rv);
if (rv != 1) {
err = wolfSSL_get_error(ssl, rv);
switch (err) {
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
return 0;
case SSL_ERROR_SSL:
case SSL_ERROR_ZERO_RETURN:
return -1;
default:
return -1;
}
}
return 0;
}
int ngtcp2_crypto_set_remote_transport_params(ngtcp2_conn *conn, void *tls) {
WOLFSSL *ssl = tls;
const uint8_t *tp;
size_t tplen;
int rv;
wolfSSL_get_peer_quic_transport_params(ssl, &tp, &tplen);
DEBUG_MSG("WOLFSSL: get peer transport params, len=%lu\n", tplen);
rv = ngtcp2_conn_decode_remote_transport_params(conn, tp, tplen);
if (rv != 0) {
DEBUG_MSG("WOLFSSL: decode peer transport params failed, rv=%d\n", rv);
ngtcp2_conn_set_tls_error(conn, rv);
return -1;
}
return 0;
}
int ngtcp2_crypto_set_local_transport_params(void *tls, const uint8_t *buf,
size_t len) {
WOLFSSL *ssl = tls;
DEBUG_MSG("WOLFSSL: set local peer transport params, len=%lu\n", len);
if (wolfSSL_set_quic_transport_params(ssl, buf, len) != WOLFSSL_SUCCESS) {
return -1;
}
return 0;
}
ngtcp2_crypto_level ngtcp2_crypto_wolfssl_from_wolfssl_encryption_level(
WOLFSSL_ENCRYPTION_LEVEL wolfssl_level) {
switch (wolfssl_level) {
case wolfssl_encryption_initial:
return NGTCP2_CRYPTO_LEVEL_INITIAL;
case wolfssl_encryption_early_data:
return NGTCP2_CRYPTO_LEVEL_EARLY;
case wolfssl_encryption_handshake:
return NGTCP2_CRYPTO_LEVEL_HANDSHAKE;
case wolfssl_encryption_application:
return NGTCP2_CRYPTO_LEVEL_APPLICATION;
default:
assert(0);
abort(); /* if NDEBUG is set */
}
}
WOLFSSL_ENCRYPTION_LEVEL
ngtcp2_crypto_wolfssl_from_ngtcp2_crypto_level(
ngtcp2_crypto_level crypto_level) {
switch (crypto_level) {
case NGTCP2_CRYPTO_LEVEL_INITIAL:
return wolfssl_encryption_initial;
case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
return wolfssl_encryption_handshake;
case NGTCP2_CRYPTO_LEVEL_APPLICATION:
return wolfssl_encryption_application;
case NGTCP2_CRYPTO_LEVEL_EARLY:
return wolfssl_encryption_early_data;
default:
assert(0);
abort(); /* if NDEBUG is set */
}
}
int ngtcp2_crypto_get_path_challenge_data_cb(ngtcp2_conn *conn, uint8_t *data,
void *user_data) {
(void)conn;
(void)user_data;
DEBUG_MSG("WOLFSSL: get path challenge data\n");
if (wolfSSL_RAND_bytes(data, NGTCP2_PATH_CHALLENGE_DATALEN) != 1) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
int ngtcp2_crypto_random(uint8_t *data, size_t datalen) {
DEBUG_MSG("WOLFSSL: get random\n");
if (wolfSSL_RAND_bytes(data, (int)datalen) != 1) {
return -1;
}
return 0;
}
static int set_encryption_secrets(WOLFSSL *ssl,
WOLFSSL_ENCRYPTION_LEVEL wolfssl_level,
const uint8_t *rx_secret,
const uint8_t *tx_secret, size_t secretlen) {
ngtcp2_crypto_conn_ref *conn_ref = SSL_get_app_data(ssl);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
ngtcp2_crypto_level level =
ngtcp2_crypto_wolfssl_from_wolfssl_encryption_level(wolfssl_level);
DEBUG_MSG("WOLFSSL: set encryption secrets, level=%d, rxlen=%lu, txlen=%lu\n",
wolfssl_level, rx_secret ? secretlen : 0,
tx_secret ? secretlen : 0);
if (rx_secret &&
ngtcp2_crypto_derive_and_install_rx_key(conn, NULL, NULL, NULL, level,
rx_secret, secretlen) != 0) {
return 0;
}
if (tx_secret &&
ngtcp2_crypto_derive_and_install_tx_key(conn, NULL, NULL, NULL, level,
tx_secret, secretlen) != 0) {
return 0;
}
return 1;
}
static int add_handshake_data(WOLFSSL *ssl,
WOLFSSL_ENCRYPTION_LEVEL wolfssl_level,
const uint8_t *data, size_t datalen) {
ngtcp2_crypto_conn_ref *conn_ref = SSL_get_app_data(ssl);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
ngtcp2_crypto_level level =
ngtcp2_crypto_wolfssl_from_wolfssl_encryption_level(wolfssl_level);
int rv;
DEBUG_MSG("WOLFSSL: add handshake data, level=%d len=%lu\n", wolfssl_level,
datalen);
rv = ngtcp2_conn_submit_crypto_data(conn, level, data, datalen);
if (rv != 0) {
ngtcp2_conn_set_tls_error(conn, rv);
return 0;
}
return 1;
}
static int flush_flight(WOLFSSL *ssl) {
(void)ssl;
return 1;
}
static int send_alert(WOLFSSL *ssl, enum wolfssl_encryption_level_t level,
uint8_t alert) {
ngtcp2_crypto_conn_ref *conn_ref = SSL_get_app_data(ssl);
ngtcp2_conn *conn = conn_ref->get_conn(conn_ref);
(void)level;
DEBUG_MSG("WOLFSSL: send alert, level=%d alert=%d\n", level, alert);
ngtcp2_conn_set_tls_alert(conn, alert);
return 1;
}
static WOLFSSL_QUIC_METHOD quic_method = {
set_encryption_secrets,
add_handshake_data,
flush_flight,
send_alert,
};
static void crypto_wolfssl_configure_context(WOLFSSL_CTX *ssl_ctx) {
wolfSSL_CTX_set_min_proto_version(ssl_ctx, TLS1_3_VERSION);
wolfSSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION);
wolfSSL_CTX_set_quic_method(ssl_ctx, &quic_method);
}
int ngtcp2_crypto_wolfssl_configure_server_context(WOLFSSL_CTX *ssl_ctx) {
crypto_wolfssl_configure_context(ssl_ctx);
return 0;
}
int ngtcp2_crypto_wolfssl_configure_client_context(WOLFSSL_CTX *ssl_ctx) {
crypto_wolfssl_configure_context(ssl_ctx);
wolfSSL_CTX_UseSessionTicket(ssl_ctx);
return 0;
}
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