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/*
* ngtcp2
*
* Copyright (c) 2020 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 <string.h>
#include <ngtcp2/ngtcp2_crypto.h>
#include <ngtcp2/ngtcp2_crypto_boringssl.h>
#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/hkdf.h>
#include <openssl/aes.h>
#include <openssl/chacha.h>
#include <openssl/rand.h>
#include "shared.h"
typedef enum ngtcp2_crypto_boringssl_cipher_type {
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_128,
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_256,
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_CHACHA20,
} ngtcp2_crypto_boringssl_cipher_type;
typedef struct ngtcp2_crypto_boringssl_cipher {
ngtcp2_crypto_boringssl_cipher_type type;
} ngtcp2_crypto_boringssl_cipher;
static ngtcp2_crypto_boringssl_cipher crypto_cipher_aes_128 = {
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_128,
};
static ngtcp2_crypto_boringssl_cipher crypto_cipher_aes_256 = {
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_256,
};
static ngtcp2_crypto_boringssl_cipher crypto_cipher_chacha20 = {
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_CHACHA20,
};
ngtcp2_crypto_aead *ngtcp2_crypto_aead_aes_128_gcm(ngtcp2_crypto_aead *aead) {
return ngtcp2_crypto_aead_init(aead, (void *)EVP_aead_aes_128_gcm());
}
ngtcp2_crypto_md *ngtcp2_crypto_md_sha256(ngtcp2_crypto_md *md) {
md->native_handle = (void *)EVP_sha256();
return md;
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_initial(ngtcp2_crypto_ctx *ctx) {
ngtcp2_crypto_aead_init(&ctx->aead, (void *)EVP_aead_aes_128_gcm());
ctx->md.native_handle = (void *)EVP_sha256();
ctx->hp.native_handle = (void *)&crypto_cipher_aes_128;
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 = EVP_AEAD_max_overhead(aead->native_handle);
return aead;
}
ngtcp2_crypto_aead *ngtcp2_crypto_aead_retry(ngtcp2_crypto_aead *aead) {
return ngtcp2_crypto_aead_init(aead, (void *)EVP_aead_aes_128_gcm());
}
static const EVP_AEAD *crypto_ssl_get_aead(SSL *ssl) {
switch (SSL_CIPHER_get_id(SSL_get_current_cipher(ssl))) {
case TLS1_CK_AES_128_GCM_SHA256:
return EVP_aead_aes_128_gcm();
case TLS1_CK_AES_256_GCM_SHA384:
return EVP_aead_aes_256_gcm();
case TLS1_CK_CHACHA20_POLY1305_SHA256:
return EVP_aead_chacha20_poly1305();
default:
return NULL;
}
}
static uint64_t crypto_ssl_get_aead_max_encryption(SSL *ssl) {
switch (SSL_CIPHER_get_id(SSL_get_current_cipher(ssl))) {
case TLS1_CK_AES_128_GCM_SHA256:
case TLS1_CK_AES_256_GCM_SHA384:
return NGTCP2_CRYPTO_MAX_ENCRYPTION_AES_GCM;
case TLS1_CK_CHACHA20_POLY1305_SHA256:
return NGTCP2_CRYPTO_MAX_ENCRYPTION_CHACHA20_POLY1305;
default:
return 0;
}
}
static uint64_t crypto_ssl_get_aead_max_decryption_failure(SSL *ssl) {
switch (SSL_CIPHER_get_id(SSL_get_current_cipher(ssl))) {
case TLS1_CK_AES_128_GCM_SHA256:
case TLS1_CK_AES_256_GCM_SHA384:
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_AES_GCM;
case TLS1_CK_CHACHA20_POLY1305_SHA256:
return NGTCP2_CRYPTO_MAX_DECRYPTION_FAILURE_CHACHA20_POLY1305;
default:
return 0;
}
}
static const ngtcp2_crypto_boringssl_cipher *crypto_ssl_get_hp(SSL *ssl) {
switch (SSL_CIPHER_get_id(SSL_get_current_cipher(ssl))) {
case TLS1_CK_AES_128_GCM_SHA256:
return &crypto_cipher_aes_128;
case TLS1_CK_AES_256_GCM_SHA384:
return &crypto_cipher_aes_256;
case TLS1_CK_CHACHA20_POLY1305_SHA256:
return &crypto_cipher_chacha20;
default:
return NULL;
}
}
static const EVP_MD *crypto_ssl_get_md(SSL *ssl) {
switch (SSL_CIPHER_get_id(SSL_get_current_cipher(ssl))) {
case TLS1_CK_AES_128_GCM_SHA256:
case TLS1_CK_CHACHA20_POLY1305_SHA256:
return EVP_sha256();
case TLS1_CK_AES_256_GCM_SHA384:
return EVP_sha384();
default:
return NULL;
}
}
ngtcp2_crypto_ctx *ngtcp2_crypto_ctx_tls(ngtcp2_crypto_ctx *ctx,
void *tls_native_handle) {
SSL *ssl = tls_native_handle;
ngtcp2_crypto_aead_init(&ctx->aead, (void *)crypto_ssl_get_aead(ssl));
ctx->md.native_handle = (void *)crypto_ssl_get_md(ssl);
ctx->hp.native_handle = (void *)crypto_ssl_get_hp(ssl);
ctx->max_encryption = crypto_ssl_get_aead_max_encryption(ssl);
ctx->max_decryption_failure = crypto_ssl_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 EVP_MD *md) {
return (size_t)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 EVP_AEAD *aead) {
return (size_t)EVP_AEAD_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 EVP_AEAD *aead) {
return (size_t)EVP_AEAD_nonce_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 EVP_AEAD *cipher = aead->native_handle;
size_t keylen = crypto_aead_keylen(cipher);
EVP_AEAD_CTX *actx;
(void)noncelen;
actx = EVP_AEAD_CTX_new(cipher, key, keylen, EVP_AEAD_DEFAULT_TAG_LENGTH);
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) {
return ngtcp2_crypto_aead_ctx_encrypt_init(aead_ctx, aead, key, noncelen);
}
void ngtcp2_crypto_aead_ctx_free(ngtcp2_crypto_aead_ctx *aead_ctx) {
if (aead_ctx->native_handle) {
EVP_AEAD_CTX_free(aead_ctx->native_handle);
}
}
typedef struct ngtcp2_crypto_boringssl_cipher_ctx {
ngtcp2_crypto_boringssl_cipher_type type;
union {
/* aes_key is an encryption key when type is either
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_128 or
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_256. */
AES_KEY aes_key;
/* key contains an encryption key when type ==
NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_CHACHA20. */
uint8_t key[32];
};
} ngtcp2_crypto_boringssl_cipher_ctx;
int ngtcp2_crypto_cipher_ctx_encrypt_init(ngtcp2_crypto_cipher_ctx *cipher_ctx,
const ngtcp2_crypto_cipher *cipher,
const uint8_t *key) {
ngtcp2_crypto_boringssl_cipher *hp_cipher = cipher->native_handle;
ngtcp2_crypto_boringssl_cipher_ctx *ctx;
int rv;
(void)rv;
ctx = malloc(sizeof(*ctx));
if (ctx == NULL) {
return -1;
}
ctx->type = hp_cipher->type;
cipher_ctx->native_handle = ctx;
switch (hp_cipher->type) {
case NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_128:
rv = AES_set_encrypt_key(key, 128, &ctx->aes_key);
assert(0 == rv);
return 0;
case NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_256:
rv = AES_set_encrypt_key(key, 256, &ctx->aes_key);
assert(0 == rv);
return 0;
case NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_CHACHA20:
memcpy(ctx->key, key, sizeof(ctx->key));
return 0;
default:
assert(0);
abort();
};
}
void ngtcp2_crypto_cipher_ctx_free(ngtcp2_crypto_cipher_ctx *cipher_ctx) {
if (!cipher_ctx->native_handle) {
return;
}
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) {
const EVP_MD *prf = md->native_handle;
size_t destlen = (size_t)EVP_MD_size(prf);
if (HKDF_extract(dest, &destlen, prf, secret, secretlen, salt, saltlen) !=
1) {
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) {
const EVP_MD *prf = md->native_handle;
if (HKDF_expand(dest, destlen, prf, secret, secretlen, info, infolen) != 1) {
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) {
const EVP_MD *prf = md->native_handle;
if (HKDF(dest, destlen, prf, secret, secretlen, salt, saltlen, info,
infolen) != 1) {
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) {
const EVP_AEAD *cipher = aead->native_handle;
EVP_AEAD_CTX *actx = aead_ctx->native_handle;
size_t max_outlen = plaintextlen + EVP_AEAD_max_overhead(cipher);
size_t outlen;
if (EVP_AEAD_CTX_seal(actx, dest, &outlen, max_outlen, nonce, noncelen,
plaintext, plaintextlen, aad, aadlen) != 1) {
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) {
const EVP_AEAD *cipher = aead->native_handle;
EVP_AEAD_CTX *actx = aead_ctx->native_handle;
size_t max_overhead = EVP_AEAD_max_overhead(cipher);
size_t max_outlen;
size_t outlen;
if (ciphertextlen < max_overhead) {
return -1;
}
max_outlen = ciphertextlen - max_overhead;
if (EVP_AEAD_CTX_open(actx, dest, &outlen, max_outlen, nonce, noncelen,
ciphertext, ciphertextlen, aad, aadlen) != 1) {
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";
ngtcp2_crypto_boringssl_cipher_ctx *ctx = hp_ctx->native_handle;
uint32_t counter;
(void)hp;
switch (ctx->type) {
case NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_128:
case NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_AES_256:
AES_ecb_encrypt(sample, dest, &ctx->aes_key, 1);
return 0;
case NGTCP2_CRYPTO_BORINGSSL_CIPHER_TYPE_CHACHA20:
#if defined(WORDS_BIGENDIAN)
counter = (uint32_t)sample[0] + (uint32_t)(sample[1] << 8) +
(uint32_t)(sample[2] << 16) + (uint32_t)(sample[3] << 24);
#else /* !WORDS_BIGENDIAN */
memcpy(&counter, sample, sizeof(counter));
#endif /* !WORDS_BIGENDIAN */
CRYPTO_chacha_20(dest, PLAINTEXT, sizeof(PLAINTEXT) - 1, ctx->key,
sample + sizeof(counter), counter);
return 0;
default:
assert(0);
abort();
}
}
int ngtcp2_crypto_read_write_crypto_data(ngtcp2_conn *conn,
ngtcp2_crypto_level crypto_level,
const uint8_t *data, size_t datalen) {
SSL *ssl = ngtcp2_conn_get_tls_native_handle(conn);
int rv;
int err;
if (SSL_provide_quic_data(
ssl, ngtcp2_crypto_boringssl_from_ngtcp2_crypto_level(crypto_level),
data, datalen) != 1) {
return -1;
}
if (!ngtcp2_conn_get_handshake_completed(conn)) {
retry:
rv = SSL_do_handshake(ssl);
if (rv <= 0) {
err = SSL_get_error(ssl, rv);
switch (err) {
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
return 0;
case SSL_ERROR_SSL:
return -1;
case SSL_ERROR_EARLY_DATA_REJECTED:
assert(!ngtcp2_conn_is_server(conn));
SSL_reset_early_data_reject(ssl);
ngtcp2_conn_early_data_rejected(conn);
goto retry;
default:
return -1;
}
}
if (SSL_in_early_data(ssl)) {
return 0;
}
ngtcp2_conn_handshake_completed(conn);
}
rv = SSL_process_quic_post_handshake(ssl);
if (rv != 1) {
err = SSL_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) {
SSL *ssl = tls;
const uint8_t *tp;
size_t tplen;
int rv;
SSL_get_peer_quic_transport_params(ssl, &tp, &tplen);
rv = ngtcp2_conn_decode_remote_transport_params(conn, tp, tplen);
if (rv != 0) {
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) {
if (SSL_set_quic_transport_params(tls, buf, len) != 1) {
return -1;
}
return 0;
}
ngtcp2_crypto_level ngtcp2_crypto_boringssl_from_ssl_encryption_level(
enum ssl_encryption_level_t ssl_level) {
switch (ssl_level) {
case ssl_encryption_initial:
return NGTCP2_CRYPTO_LEVEL_INITIAL;
case ssl_encryption_early_data:
return NGTCP2_CRYPTO_LEVEL_EARLY;
case ssl_encryption_handshake:
return NGTCP2_CRYPTO_LEVEL_HANDSHAKE;
case ssl_encryption_application:
return NGTCP2_CRYPTO_LEVEL_APPLICATION;
default:
assert(0);
abort();
}
}
enum ssl_encryption_level_t ngtcp2_crypto_boringssl_from_ngtcp2_crypto_level(
ngtcp2_crypto_level crypto_level) {
switch (crypto_level) {
case NGTCP2_CRYPTO_LEVEL_INITIAL:
return ssl_encryption_initial;
case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
return ssl_encryption_handshake;
case NGTCP2_CRYPTO_LEVEL_APPLICATION:
return ssl_encryption_application;
case NGTCP2_CRYPTO_LEVEL_EARLY:
return ssl_encryption_early_data;
default:
assert(0);
abort();
}
}
int ngtcp2_crypto_get_path_challenge_data_cb(ngtcp2_conn *conn, uint8_t *data,
void *user_data) {
(void)conn;
(void)user_data;
if (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) {
if (RAND_bytes(data, datalen) != 1) {
return -1;
}
return 0;
}
static int set_read_secret(SSL *ssl, enum ssl_encryption_level_t bssl_level,
const SSL_CIPHER *cipher, const uint8_t *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_boringssl_from_ssl_encryption_level(bssl_level);
(void)cipher;
if (ngtcp2_crypto_derive_and_install_rx_key(conn, NULL, NULL, NULL, level,
secret, secretlen) != 0) {
return 0;
}
return 1;
}
static int set_write_secret(SSL *ssl, enum ssl_encryption_level_t bssl_level,
const SSL_CIPHER *cipher, const uint8_t *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_boringssl_from_ssl_encryption_level(bssl_level);
(void)cipher;
if (ngtcp2_crypto_derive_and_install_tx_key(conn, NULL, NULL, NULL, level,
secret, secretlen) != 0) {
return 0;
}
return 1;
}
static int add_handshake_data(SSL *ssl, enum ssl_encryption_level_t bssl_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_boringssl_from_ssl_encryption_level(bssl_level);
int rv;
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(SSL *ssl) {
(void)ssl;
return 1;
}
static int send_alert(SSL *ssl, enum ssl_encryption_level_t bssl_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)bssl_level;
ngtcp2_conn_set_tls_alert(conn, alert);
return 1;
}
static SSL_QUIC_METHOD quic_method = {
set_read_secret, set_write_secret, add_handshake_data,
flush_flight, send_alert,
};
static void crypto_boringssl_configure_context(SSL_CTX *ssl_ctx) {
SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_3_VERSION);
SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION);
SSL_CTX_set_quic_method(ssl_ctx, &quic_method);
}
int ngtcp2_crypto_boringssl_configure_server_context(SSL_CTX *ssl_ctx) {
crypto_boringssl_configure_context(ssl_ctx);
return 0;
}
int ngtcp2_crypto_boringssl_configure_client_context(SSL_CTX *ssl_ctx) {
crypto_boringssl_configure_context(ssl_ctx);
return 0;
}
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