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/*
* ngtcp2
*
* Copyright (c) 2019 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.
*/
#include "shared.h"
#include <string.h>
#include <assert.h>
#include "ngtcp2_macro.h"
int ngtcp2_crypto_hkdf_expand_label(uint8_t *dest, size_t destlen,
const ngtcp2_crypto_md *md,
const uint8_t *secret, size_t secretlen,
const uint8_t *label, size_t labellen) {
static const uint8_t LABEL[] = "tls13 ";
uint8_t info[256];
uint8_t *p = info;
*p++ = (uint8_t)(destlen / 256);
*p++ = (uint8_t)(destlen % 256);
*p++ = (uint8_t)(sizeof(LABEL) - 1 + labellen);
memcpy(p, LABEL, sizeof(LABEL) - 1);
p += sizeof(LABEL) - 1;
memcpy(p, label, labellen);
p += labellen;
*p++ = 0;
return ngtcp2_crypto_hkdf_expand(dest, destlen, md, secret, secretlen, info,
(size_t)(p - info));
}
#define NGTCP2_CRYPTO_INITIAL_SECRETLEN 32
int ngtcp2_crypto_derive_initial_secrets(uint8_t *rx_secret, uint8_t *tx_secret,
uint8_t *initial_secret,
const ngtcp2_cid *client_dcid,
ngtcp2_crypto_side side) {
static const uint8_t CLABEL[] = "client in";
static const uint8_t SLABEL[] = "server in";
uint8_t initial_secret_buf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
uint8_t *client_secret;
uint8_t *server_secret;
ngtcp2_crypto_ctx ctx;
if (!initial_secret) {
initial_secret = initial_secret_buf;
}
ngtcp2_crypto_ctx_initial(&ctx);
if (ngtcp2_crypto_hkdf_extract(initial_secret, &ctx.md, client_dcid->data,
client_dcid->datalen,
(const uint8_t *)NGTCP2_INITIAL_SALT,
sizeof(NGTCP2_INITIAL_SALT) - 1) != 0) {
return -1;
}
if (side == NGTCP2_CRYPTO_SIDE_SERVER) {
client_secret = rx_secret;
server_secret = tx_secret;
} else {
client_secret = tx_secret;
server_secret = rx_secret;
}
if (ngtcp2_crypto_hkdf_expand_label(
client_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, &ctx.md,
initial_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, CLABEL,
sizeof(CLABEL) - 1) != 0 ||
ngtcp2_crypto_hkdf_expand_label(
server_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, &ctx.md,
initial_secret, NGTCP2_CRYPTO_INITIAL_SECRETLEN, SLABEL,
sizeof(SLABEL) - 1) != 0) {
return -1;
}
return 0;
}
size_t ngtcp2_crypto_packet_protection_ivlen(const ngtcp2_crypto_aead *aead) {
size_t noncelen = ngtcp2_crypto_aead_noncelen(aead);
return ngtcp2_max(8, noncelen);
}
int ngtcp2_crypto_derive_packet_protection_key(
uint8_t *key, uint8_t *iv, uint8_t *hp_key, const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_md *md, const uint8_t *secret, size_t secretlen) {
static const uint8_t KEY_LABEL[] = "quic key";
static const uint8_t IV_LABEL[] = "quic iv";
static const uint8_t HP_KEY_LABEL[] = "quic hp";
size_t keylen = ngtcp2_crypto_aead_keylen(aead);
size_t ivlen = ngtcp2_crypto_packet_protection_ivlen(aead);
if (ngtcp2_crypto_hkdf_expand_label(key, keylen, md, secret, secretlen,
KEY_LABEL, sizeof(KEY_LABEL) - 1) != 0) {
return -1;
}
if (ngtcp2_crypto_hkdf_expand_label(iv, ivlen, md, secret, secretlen,
IV_LABEL, sizeof(IV_LABEL) - 1) != 0) {
return -1;
}
if (hp_key != NULL && ngtcp2_crypto_hkdf_expand_label(
hp_key, keylen, md, secret, secretlen, HP_KEY_LABEL,
sizeof(HP_KEY_LABEL) - 1) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_update_traffic_secret(uint8_t *dest,
const ngtcp2_crypto_md *md,
const uint8_t *secret,
size_t secretlen) {
static const uint8_t LABEL[] = "quic ku";
if (ngtcp2_crypto_hkdf_expand_label(dest, secretlen, md, secret, secretlen,
LABEL, sizeof(LABEL) - 1) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_derive_and_install_rx_key(ngtcp2_conn *conn, uint8_t *key,
uint8_t *iv, uint8_t *hp_key,
ngtcp2_crypto_level level,
const uint8_t *secret,
size_t secretlen) {
const ngtcp2_crypto_ctx *ctx;
const ngtcp2_crypto_aead *aead;
const ngtcp2_crypto_md *md;
void *tls = ngtcp2_conn_get_tls_native_handle(conn);
uint8_t keybuf[64], ivbuf[64], hp_keybuf[64];
size_t keylen;
size_t ivlen;
int rv;
if (level == NGTCP2_CRYPTO_LEVEL_EARLY && !ngtcp2_conn_is_server(conn)) {
return 0;
}
if (!key) {
key = keybuf;
}
if (!iv) {
iv = ivbuf;
}
if (!hp_key) {
hp_key = hp_keybuf;
}
ctx = ngtcp2_conn_get_crypto_ctx(conn);
if (!ctx->aead.native_handle) {
ngtcp2_crypto_ctx cctx;
ngtcp2_crypto_ctx_tls(&cctx, tls);
ngtcp2_conn_set_aead_overhead(conn, ngtcp2_crypto_aead_taglen(&cctx.aead));
ngtcp2_conn_set_crypto_ctx(conn, &cctx);
ctx = ngtcp2_conn_get_crypto_ctx(conn);
}
aead = &ctx->aead;
md = &ctx->md;
keylen = ngtcp2_crypto_aead_keylen(aead);
ivlen = ngtcp2_crypto_packet_protection_ivlen(aead);
if (ngtcp2_crypto_derive_packet_protection_key(key, iv, hp_key, aead, md,
secret, secretlen) != 0) {
return -1;
}
switch (level) {
case NGTCP2_CRYPTO_LEVEL_EARLY:
rv = ngtcp2_conn_install_early_key(conn, key, iv, hp_key, keylen, ivlen);
if (rv != 0) {
return -1;
}
break;
case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
rv = ngtcp2_conn_install_rx_handshake_key(conn, key, iv, hp_key, keylen,
ivlen);
if (rv != 0) {
return -1;
}
break;
case NGTCP2_CRYPTO_LEVEL_APP:
if (!ngtcp2_conn_is_server(conn)) {
rv = ngtcp2_crypto_set_remote_transport_params(conn, tls);
if (rv != 0) {
return -1;
}
}
rv = ngtcp2_conn_install_rx_key(conn, secret, key, iv, hp_key, secretlen,
keylen, ivlen);
if (rv != 0) {
return -1;
}
break;
default:
return -1;
}
return 0;
}
int ngtcp2_crypto_derive_and_install_tx_key(ngtcp2_conn *conn, uint8_t *key,
uint8_t *iv, uint8_t *hp_key,
ngtcp2_crypto_level level,
const uint8_t *secret,
size_t secretlen) {
const ngtcp2_crypto_ctx *ctx;
const ngtcp2_crypto_aead *aead;
const ngtcp2_crypto_md *md;
void *tls = ngtcp2_conn_get_tls_native_handle(conn);
uint8_t keybuf[64], ivbuf[64], hp_keybuf[64];
size_t keylen;
size_t ivlen;
int rv;
if (level == NGTCP2_CRYPTO_LEVEL_EARLY && ngtcp2_conn_is_server(conn)) {
return 0;
}
if (!key) {
key = keybuf;
}
if (!iv) {
iv = ivbuf;
}
if (!hp_key) {
hp_key = hp_keybuf;
}
ctx = ngtcp2_conn_get_crypto_ctx(conn);
if (!ctx->aead.native_handle) {
ngtcp2_crypto_ctx cctx;
ngtcp2_crypto_ctx_tls(&cctx, tls);
ngtcp2_conn_set_aead_overhead(conn, ngtcp2_crypto_aead_taglen(&cctx.aead));
ngtcp2_conn_set_crypto_ctx(conn, &cctx);
ctx = ngtcp2_conn_get_crypto_ctx(conn);
}
aead = &ctx->aead;
md = &ctx->md;
keylen = ngtcp2_crypto_aead_keylen(aead);
ivlen = ngtcp2_crypto_packet_protection_ivlen(aead);
if (ngtcp2_crypto_derive_packet_protection_key(key, iv, hp_key, aead, md,
secret, secretlen) != 0) {
return -1;
}
switch (level) {
case NGTCP2_CRYPTO_LEVEL_EARLY:
rv = ngtcp2_conn_install_early_key(conn, key, iv, hp_key, keylen, ivlen);
if (rv != 0) {
return -1;
}
break;
case NGTCP2_CRYPTO_LEVEL_HANDSHAKE:
if (ngtcp2_conn_is_server(conn)) {
rv = ngtcp2_crypto_set_remote_transport_params(conn, tls);
if (rv != 0) {
return -1;
}
}
rv = ngtcp2_conn_install_tx_handshake_key(conn, key, iv, hp_key, keylen,
ivlen);
if (rv != 0) {
return -1;
}
break;
case NGTCP2_CRYPTO_LEVEL_APP:
rv = ngtcp2_conn_install_tx_key(conn, secret, key, iv, hp_key, secretlen,
keylen, ivlen);
if (rv != 0) {
return -1;
}
break;
default:
return -1;
}
return 0;
}
int ngtcp2_crypto_derive_and_install_initial_key(
ngtcp2_conn *conn, uint8_t *rx_secret, uint8_t *tx_secret,
uint8_t *initial_secret, uint8_t *rx_key, uint8_t *rx_iv,
uint8_t *rx_hp_key, uint8_t *tx_key, uint8_t *tx_iv, uint8_t *tx_hp_key,
const ngtcp2_cid *client_dcid) {
uint8_t rx_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
uint8_t tx_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
uint8_t initial_secretbuf[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
uint8_t rx_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
uint8_t rx_ivbuf[NGTCP2_CRYPTO_INITIAL_IVLEN];
uint8_t rx_hp_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
uint8_t tx_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
uint8_t tx_ivbuf[NGTCP2_CRYPTO_INITIAL_IVLEN];
uint8_t tx_hp_keybuf[NGTCP2_CRYPTO_INITIAL_KEYLEN];
ngtcp2_crypto_ctx ctx;
ngtcp2_crypto_aead retry_aead;
int rv;
ngtcp2_crypto_ctx_initial(&ctx);
if (!rx_secret) {
rx_secret = rx_secretbuf;
}
if (!tx_secret) {
tx_secret = tx_secretbuf;
}
if (!initial_secret) {
initial_secret = initial_secretbuf;
}
if (!rx_key) {
rx_key = rx_keybuf;
}
if (!rx_iv) {
rx_iv = rx_ivbuf;
}
if (!rx_hp_key) {
rx_hp_key = rx_hp_keybuf;
}
if (!tx_key) {
tx_key = tx_keybuf;
}
if (!tx_iv) {
tx_iv = tx_ivbuf;
}
if (!tx_hp_key) {
tx_hp_key = tx_hp_keybuf;
}
ngtcp2_conn_set_initial_crypto_ctx(conn, &ctx);
if (ngtcp2_crypto_derive_initial_secrets(
rx_secret, tx_secret, initial_secret, client_dcid,
ngtcp2_conn_is_server(conn) ? NGTCP2_CRYPTO_SIDE_SERVER
: NGTCP2_CRYPTO_SIDE_CLIENT) != 0) {
return -1;
}
if (ngtcp2_crypto_derive_packet_protection_key(
rx_key, rx_iv, rx_hp_key, &ctx.aead, &ctx.md, rx_secret,
NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
return -1;
}
if (ngtcp2_crypto_derive_packet_protection_key(
tx_key, tx_iv, tx_hp_key, &ctx.aead, &ctx.md, tx_secret,
NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
return -1;
}
rv = ngtcp2_conn_install_initial_key(
conn, rx_key, rx_iv, rx_hp_key, tx_key, tx_iv, tx_hp_key,
NGTCP2_CRYPTO_INITIAL_KEYLEN, NGTCP2_CRYPTO_INITIAL_IVLEN);
if (rv != 0) {
return -1;
}
ngtcp2_conn_set_retry_aead(conn, ngtcp2_crypto_aead_retry(&retry_aead));
return 0;
}
int ngtcp2_crypto_update_key(ngtcp2_conn *conn, uint8_t *rx_secret,
uint8_t *tx_secret, uint8_t *rx_key,
uint8_t *rx_iv, uint8_t *tx_key, uint8_t *tx_iv,
const uint8_t *current_rx_secret,
const uint8_t *current_tx_secret,
size_t secretlen) {
const ngtcp2_crypto_ctx *ctx = ngtcp2_conn_get_crypto_ctx(conn);
const ngtcp2_crypto_aead *aead = &ctx->aead;
const ngtcp2_crypto_md *md = &ctx->md;
if (ngtcp2_crypto_update_traffic_secret(rx_secret, md, current_rx_secret,
secretlen) != 0) {
return -1;
}
if (ngtcp2_crypto_derive_packet_protection_key(rx_key, rx_iv, NULL, aead, md,
rx_secret, secretlen) != 0) {
return -1;
}
if (ngtcp2_crypto_update_traffic_secret(tx_secret, md, current_tx_secret,
secretlen) != 0) {
return -1;
}
if (ngtcp2_crypto_derive_packet_protection_key(tx_key, tx_iv, NULL, aead, md,
tx_secret, secretlen) != 0) {
return -1;
}
return 0;
}
int ngtcp2_crypto_encrypt_cb(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const uint8_t *plaintext, size_t plaintextlen,
const uint8_t *key, const uint8_t *nonce,
size_t noncelen, const uint8_t *ad, size_t adlen) {
if (ngtcp2_crypto_encrypt(dest, aead, plaintext, plaintextlen, key, nonce,
noncelen, ad, adlen) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
int ngtcp2_crypto_decrypt_cb(uint8_t *dest, const ngtcp2_crypto_aead *aead,
const uint8_t *ciphertext, size_t ciphertextlen,
const uint8_t *key, const uint8_t *nonce,
size_t noncelen, const uint8_t *ad, size_t adlen) {
if (ngtcp2_crypto_decrypt(dest, aead, ciphertext, ciphertextlen, key, nonce,
noncelen, ad, adlen) != 0) {
return NGTCP2_ERR_TLS_DECRYPT;
}
return 0;
}
int ngtcp2_crypto_hp_mask_cb(uint8_t *dest, const ngtcp2_crypto_cipher *hp,
const uint8_t *hp_key, const uint8_t *sample) {
if (ngtcp2_crypto_hp_mask(dest, hp, hp_key, sample) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
int ngtcp2_crypto_update_key_cb(ngtcp2_conn *conn, uint8_t *rx_secret,
uint8_t *tx_secret, uint8_t *rx_key,
uint8_t *rx_iv, uint8_t *tx_key, uint8_t *tx_iv,
const uint8_t *current_rx_secret,
const uint8_t *current_tx_secret,
size_t secretlen, void *user_data) {
(void)conn;
(void)user_data;
if (ngtcp2_crypto_update_key(conn, rx_secret, tx_secret, rx_key, rx_iv,
tx_key, tx_iv, current_rx_secret,
current_tx_secret, secretlen) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
int ngtcp2_crypto_generate_stateless_reset_token(uint8_t *token,
const ngtcp2_crypto_md *md,
const uint8_t *secret,
size_t secretlen,
const ngtcp2_cid *cid) {
uint8_t buf[64];
int rv;
assert(ngtcp2_crypto_md_hashlen(md) <= sizeof(buf));
assert(NGTCP2_STATELESS_RESET_TOKENLEN <= sizeof(buf));
rv = ngtcp2_crypto_hkdf_extract(buf, md, secret, secretlen, cid->data,
cid->datalen);
if (rv != 0) {
return -1;
}
memcpy(token, buf, NGTCP2_STATELESS_RESET_TOKENLEN);
return 0;
}
ngtcp2_ssize ngtcp2_crypto_write_connection_close(uint8_t *dest, size_t destlen,
const ngtcp2_cid *dcid,
const ngtcp2_cid *scid,
uint64_t error_code) {
uint8_t rx_secret[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
uint8_t tx_secret[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
uint8_t initial_secret[NGTCP2_CRYPTO_INITIAL_SECRETLEN];
uint8_t tx_key[NGTCP2_CRYPTO_INITIAL_KEYLEN];
uint8_t tx_iv[NGTCP2_CRYPTO_INITIAL_IVLEN];
uint8_t tx_hp_key[NGTCP2_CRYPTO_INITIAL_KEYLEN];
ngtcp2_crypto_ctx ctx;
ngtcp2_ssize spktlen;
ngtcp2_crypto_ctx_initial(&ctx);
if (ngtcp2_crypto_derive_initial_secrets(rx_secret, tx_secret, initial_secret,
scid,
NGTCP2_CRYPTO_SIDE_SERVER) != 0) {
return -1;
}
if (ngtcp2_crypto_derive_packet_protection_key(
tx_key, tx_iv, tx_hp_key, &ctx.aead, &ctx.md, tx_secret,
NGTCP2_CRYPTO_INITIAL_SECRETLEN) != 0) {
return -1;
}
spktlen = ngtcp2_pkt_write_connection_close(
dest, destlen, dcid, scid, error_code, ngtcp2_crypto_encrypt_cb,
&ctx.aead, tx_key, tx_iv, ngtcp2_crypto_hp_mask_cb, &ctx.hp, tx_hp_key);
if (spktlen < 0) {
return -1;
}
return spktlen;
}
ngtcp2_ssize ngtcp2_crypto_write_retry(uint8_t *dest, size_t destlen,
const ngtcp2_cid *dcid,
const ngtcp2_cid *scid,
const ngtcp2_cid *odcid,
const uint8_t *token, size_t tokenlen) {
ngtcp2_crypto_aead aead;
ngtcp2_ssize spktlen;
ngtcp2_crypto_aead_retry(&aead);
spktlen = ngtcp2_pkt_write_retry(dest, destlen, dcid, scid, odcid, token,
tokenlen, ngtcp2_crypto_encrypt_cb, &aead);
if (spktlen < 0) {
return -1;
}
return spktlen;
}
/*
* crypto_set_local_transport_params gets local QUIC transport
* parameters from |conn| and sets it to |tls|.
*
* This function returns 0 if it succeeds, or -1.
*/
static int crypto_set_local_transport_params(ngtcp2_conn *conn, void *tls) {
ngtcp2_transport_params_type exttype =
ngtcp2_conn_is_server(conn)
? NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS
: NGTCP2_TRANSPORT_PARAMS_TYPE_CLIENT_HELLO;
ngtcp2_transport_params params;
ngtcp2_ssize nwrite;
uint8_t buf[256];
ngtcp2_conn_get_local_transport_params(conn, ¶ms);
nwrite = ngtcp2_encode_transport_params(buf, sizeof(buf), exttype, ¶ms);
if (nwrite < 0) {
return -1;
}
if (ngtcp2_crypto_set_local_transport_params(tls, buf, (size_t)nwrite) != 0) {
return -1;
}
return 0;
}
/*
* crypto_setup_initial_crypto establishes the initial secrets and
* encryption keys, and prepares local QUIC transport parameters.
*/
static int crypto_setup_initial_crypto(ngtcp2_conn *conn,
const ngtcp2_cid *dcid) {
void *tls = ngtcp2_conn_get_tls_native_handle(conn);
if (ngtcp2_crypto_derive_and_install_initial_key(conn, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL,
dcid) != 0) {
return -1;
}
return crypto_set_local_transport_params(conn, tls);
}
int ngtcp2_crypto_client_initial_cb(ngtcp2_conn *conn, void *user_data) {
const ngtcp2_cid *dcid = ngtcp2_conn_get_dcid(conn);
(void)user_data;
if (crypto_setup_initial_crypto(conn, dcid) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
if (ngtcp2_crypto_read_write_crypto_data(conn, NGTCP2_CRYPTO_LEVEL_INITIAL,
NULL, 0) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
int ngtcp2_crypto_recv_retry_cb(ngtcp2_conn *conn, const ngtcp2_pkt_hd *hd,
void *user_data) {
(void)user_data;
if (ngtcp2_crypto_derive_and_install_initial_key(conn, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL,
&hd->scid) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
int ngtcp2_crypto_recv_client_initial_cb(ngtcp2_conn *conn,
const ngtcp2_cid *dcid,
void *user_data) {
(void)user_data;
if (crypto_setup_initial_crypto(conn, dcid) != 0) {
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
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