lsquic_enc_sess_ietf.c revision a137764b
1/* Copyright (c) 2017 - 2019 LiteSpeed Technologies Inc. See LICENSE. */ 2/* 3 * lsquic_enc_sess_ietf.c -- Crypto session for IETF QUIC 4 */ 5 6#include <assert.h> 7#include <errno.h> 8#include <stddef.h> 9#include <stdlib.h> 10#include <string.h> 11#include <sys/queue.h> 12#if LSQUIC_PREFERRED_ADDR 13#include <arpa/inet.h> 14#endif 15 16#include <openssl/chacha.h> 17#include <openssl/hkdf.h> 18#include <openssl/rand.h> 19#include <openssl/ssl.h> 20 21#include "lsquic_types.h" 22#include "lsquic_hkdf.h" 23#include "lsquic.h" 24#include "lsquic_int_types.h" 25#include "lsquic_sizes.h" 26#include "lsquic_hash.h" 27#include "lsquic_conn.h" 28#include "lsquic_enc_sess.h" 29#include "lsquic_parse.h" 30#include "lsquic_mm.h" 31#include "lsquic_engine_public.h" 32#include "lsquic_packet_common.h" 33#include "lsquic_packet_out.h" 34#include "lsquic_packet_ietf.h" 35#include "lsquic_packet_in.h" 36#include "lsquic_util.h" 37#include "lsquic_byteswap.h" 38#include "lsquic_ev_log.h" 39#include "lsquic_trans_params.h" 40#include "lsquic_engine_public.h" 41#include "lsquic_version.h" 42#include "lsquic_ver_neg.h" 43#include "lsquic_byteswap.h" 44#include "lsquic_frab_list.h" 45#include "lsquic_tokgen.h" 46#include "lsquic_ietf.h" 47#include "lsquic_alarmset.h" 48 49#if __GNUC__ 50# define UNLIKELY(cond) __builtin_expect(cond, 0) 51#else 52# define UNLIKELY(cond) cond 53#endif 54 55#define MAX(a, b) ((a) > (b) ? (a) : (b)) 56 57#define LSQUIC_LOGGER_MODULE LSQLM_HANDSHAKE 58#define LSQUIC_LOG_CONN_ID lsquic_conn_log_cid(enc_sess->esi_conn) 59#include "lsquic_logger.h" 60 61/* [draft-ietf-quic-tls-11] Section 5.3.2 */ 62#define HSK_SECRET_SZ SHA256_DIGEST_LENGTH 63 64/* TODO: Specify ciphers */ 65#define HSK_CIPHERS "TLS13-AES-128-GCM-SHA256" \ 66 ":TLS13-AES-256-GCM-SHA384" \ 67 ":TLS13-CHACHA20-POLY1305-SHA256" 68 69#define KEY_LABEL "quic key" 70#define KEY_LABEL_SZ (sizeof(KEY_LABEL) - 1) 71#define IV_LABEL "quic iv" 72#define IV_LABEL_SZ (sizeof(IV_LABEL) - 1) 73#define PN_LABEL "quic hp" 74#define PN_LABEL_SZ (sizeof(PN_LABEL) - 1) 75 76#define N_HSK_PAIRS (N_ENC_LEVS - 1) 77 78static const struct alpn_map { 79 enum lsquic_version version; 80 const unsigned char *alpn; 81} s_alpns[] = { 82 { LSQVER_ID24, (unsigned char *) "\x05h3-24", }, 83 { LSQVER_ID23, (unsigned char *) "\x05h3-23", }, 84 { LSQVER_VERNEG, (unsigned char *) "\x05h3-24", }, 85}; 86 87struct enc_sess_iquic; 88struct crypto_ctx; 89struct crypto_ctx_pair; 90struct header_prot; 91 92static const int s_log_seal_and_open; 93static char s_str[0x1000]; 94 95static const SSL_QUIC_METHOD cry_quic_method; 96 97static int s_idx = -1; 98 99static int 100setup_handshake_keys (struct enc_sess_iquic *, const lsquic_cid_t *); 101 102static void 103free_handshake_keys (struct enc_sess_iquic *); 104 105static struct stack_st_X509 * 106iquic_esf_get_server_cert_chain (enc_session_t *); 107 108static void 109maybe_drop_SSL (struct enc_sess_iquic *); 110 111static void 112no_sess_ticket (enum alarm_id alarm_id, void *ctx, 113 lsquic_time_t expiry, lsquic_time_t now); 114 115 116typedef void (*gen_hp_mask_f)(struct enc_sess_iquic *, 117 const struct header_prot *, unsigned cliser, 118 const unsigned char *sample, unsigned char mask[16]); 119 120 121struct header_prot 122{ 123 const EVP_CIPHER *hp_cipher; 124 gen_hp_mask_f hp_gen_mask; 125 enum enc_level hp_enc_level; 126 unsigned hp_sz; 127 unsigned char hp_buf[2][EVP_MAX_KEY_LENGTH]; 128}; 129 130#define header_prot_inited(hp_) ((hp_)->hp_sz > 0) 131 132 133struct crypto_ctx 134{ 135 enum { 136 YK_INITED = 1 << 0, 137 } yk_flags; 138 EVP_AEAD_CTX yk_aead_ctx; 139 unsigned yk_key_sz; 140 unsigned yk_iv_sz; 141 unsigned char yk_key_buf[EVP_MAX_KEY_LENGTH]; 142 unsigned char yk_iv_buf[EVP_MAX_IV_LENGTH]; 143}; 144 145 146struct crypto_ctx_pair 147{ 148 lsquic_packno_t ykp_thresh; 149 struct crypto_ctx ykp_ctx[2]; /* client, server */ 150}; 151 152 153/* [draft-ietf-quic-tls-12] Section 5.3.6 */ 154static int 155init_crypto_ctx (struct crypto_ctx *crypto_ctx, const EVP_MD *md, 156 const EVP_AEAD *aead, const unsigned char *secret, 157 size_t secret_sz, enum evp_aead_direction_t dir) 158{ 159 crypto_ctx->yk_key_sz = EVP_AEAD_key_length(aead); 160 crypto_ctx->yk_iv_sz = EVP_AEAD_nonce_length(aead); 161 162 if (crypto_ctx->yk_key_sz > sizeof(crypto_ctx->yk_key_buf) 163 || crypto_ctx->yk_iv_sz > sizeof(crypto_ctx->yk_iv_buf)) 164 { 165 return -1; 166 } 167 168 lsquic_qhkdf_expand(md, secret, secret_sz, KEY_LABEL, KEY_LABEL_SZ, 169 crypto_ctx->yk_key_buf, crypto_ctx->yk_key_sz); 170 lsquic_qhkdf_expand(md, secret, secret_sz, IV_LABEL, IV_LABEL_SZ, 171 crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz); 172 if (!EVP_AEAD_CTX_init_with_direction(&crypto_ctx->yk_aead_ctx, aead, 173 crypto_ctx->yk_key_buf, crypto_ctx->yk_key_sz, IQUIC_TAG_LEN, dir)) 174 return -1; 175 176 crypto_ctx->yk_flags |= YK_INITED; 177 178 return 0; 179} 180 181 182static void 183derive_hp_secrets (struct header_prot *hp, const EVP_MD *md, 184 const EVP_AEAD *aead, size_t secret_sz, 185 const unsigned char *client_secret, const unsigned char *server_secret) 186{ 187 hp->hp_sz = EVP_AEAD_key_length(aead); 188 if (client_secret) 189 lsquic_qhkdf_expand(md, client_secret, secret_sz, PN_LABEL, PN_LABEL_SZ, 190 hp->hp_buf[0], hp->hp_sz); 191 if (server_secret) 192 lsquic_qhkdf_expand(md, server_secret, secret_sz, PN_LABEL, PN_LABEL_SZ, 193 hp->hp_buf[1], hp->hp_sz); 194} 195 196 197static void 198cleanup_crypto_ctx (struct crypto_ctx *crypto_ctx) 199{ 200 if (crypto_ctx->yk_flags & YK_INITED) 201 { 202 EVP_AEAD_CTX_cleanup(&crypto_ctx->yk_aead_ctx); 203 crypto_ctx->yk_flags &= ~YK_INITED; 204 } 205} 206 207 208struct enc_sess_iquic 209{ 210 struct lsquic_engine_public 211 *esi_enpub; 212 struct lsquic_conn *esi_conn; 213 void **esi_streams; 214 const struct crypto_stream_if *esi_cryst_if; 215 const struct ver_neg 216 *esi_ver_neg; 217 SSL *esi_ssl; 218 219 /* These are used for forward encryption key phase 0 and 1 */ 220 struct header_prot esi_hp; 221 struct crypto_ctx_pair 222 esi_pairs[2]; 223 /* These are used during handshake. There are three of them. 224 * esi_hsk_pairs and esi_hsk_hps are allocated and freed 225 * together. 226 */ 227 struct crypto_ctx_pair * 228 esi_hsk_pairs; 229 struct header_prot *esi_hsk_hps; 230 lsquic_packno_t esi_max_packno[N_PNS]; 231 lsquic_cid_t esi_odcid; 232 unsigned esi_key_phase; 233 enum { 234 ESI_INITIALIZED = 1 << 0, 235 ESI_LOG_SECRETS = 1 << 1, 236 ESI_HANDSHAKE_OK = 1 << 2, 237 ESI_ODCID = 1 << 3, 238 ESI_ON_WRITE = 1 << 4, 239 ESI_SERVER = 1 << 5, 240 ESI_USE_SSL_TICKET = 1 << 6, 241 ESI_HAVE_PEER_TP = 1 << 7, 242 ESI_ALPN_CHECKED = 1 << 8, 243 ESI_CACHED_INFO = 1 << 9, 244 ESI_1RTT_ACKED = 1 << 10, 245 ESI_WANT_TICKET = 1 << 11, 246 ESI_QL_BITS = 1 << 12, 247 } esi_flags; 248 enum evp_aead_direction_t 249 esi_dir[2]; /* client, server */ 250 enum enc_level esi_last_w; 251 unsigned esi_trasec_sz; 252 char *esi_hostname; 253 void *esi_keylog_handle; 254#ifndef NDEBUG 255 char *esi_sni_bypass; 256#endif 257 const unsigned char *esi_alpn; 258 unsigned char *esi_zero_rtt_buf; 259 size_t esi_zero_rtt_sz; 260 /* Need MD and AEAD for key rotation */ 261 const EVP_MD *esi_md; 262 const EVP_AEAD *esi_aead; 263 struct { 264 const char *cipher_name; 265 int alg_bits; 266 } esi_cached_info; 267 /* Secrets are kept for key rotation */ 268 unsigned char esi_traffic_secrets[2][EVP_MAX_KEY_LENGTH]; 269 /* We never use the first two levels, so it seems we could reduce the 270 * memory requirement here at the cost of adding some code. 271 */ 272 struct frab_list esi_frals[N_ENC_LEVS]; 273 struct transport_params 274 esi_peer_tp; 275 struct lsquic_alarmset 276 *esi_alset; 277 unsigned esi_max_streams_uni; 278}; 279 280 281static void 282gen_hp_mask_aes (struct enc_sess_iquic *enc_sess, 283 const struct header_prot *hp, unsigned cliser, 284 const unsigned char *sample, unsigned char mask[EVP_MAX_BLOCK_LENGTH]) 285{ 286 EVP_CIPHER_CTX hp_ctx; 287 int out_len; 288 289 EVP_CIPHER_CTX_init(&hp_ctx); 290 if (EVP_EncryptInit_ex(&hp_ctx, hp->hp_cipher, NULL, hp->hp_buf[cliser], 0) 291 && EVP_EncryptUpdate(&hp_ctx, mask, &out_len, sample, 16)) 292 { 293 assert(out_len >= 5); 294 } 295 else 296 { 297 LSQ_WARN("cannot generate hp mask, error code: %"PRIu32, 298 ERR_get_error()); 299 enc_sess->esi_conn->cn_if->ci_internal_error(enc_sess->esi_conn, 300 "cannot generate hp mask, error code: %"PRIu32, ERR_get_error()); 301 } 302 303 (void) EVP_CIPHER_CTX_cleanup(&hp_ctx); 304} 305 306 307static void 308gen_hp_mask_chacha20 (struct enc_sess_iquic *enc_sess, 309 const struct header_prot *hp, unsigned cliser, 310 const unsigned char *sample, unsigned char mask[EVP_MAX_BLOCK_LENGTH]) 311{ 312 const uint8_t *nonce; 313 uint32_t counter; 314 315#if __BYTE_ORDER == __LITTLE_ENDIAN 316 memcpy(&counter, sample, sizeof(counter)); 317#else 318#error TODO: support non-little-endian machines 319#endif 320 nonce = sample + sizeof(counter); 321 CRYPTO_chacha_20(mask, (unsigned char [5]) { 0, 0, 0, 0, 0, }, 5, 322 hp->hp_buf[cliser], nonce, counter); 323} 324 325 326static void 327apply_hp (struct enc_sess_iquic *enc_sess, 328 const struct header_prot *hp, unsigned cliser, 329 unsigned char *dst, unsigned packno_off, unsigned packno_len) 330{ 331 unsigned char mask[EVP_MAX_BLOCK_LENGTH]; 332 char mask_str[5 * 2 + 1]; 333 334 hp->hp_gen_mask(enc_sess, hp, cliser, dst + packno_off + 4, mask); 335 LSQ_DEBUG("apply header protection using mask %s", 336 HEXSTR(mask, 5, mask_str)); 337 if (enc_sess->esi_flags & ESI_QL_BITS) 338 dst[0] ^= (0x7 | ((dst[0] >> 7) << 3)) & mask[0]; 339 else 340 dst[0] ^= (0xF | (((dst[0] & 0x80) == 0) << 4)) & mask[0]; 341 switch (packno_len) 342 { 343 case 4: 344 dst[packno_off + 3] ^= mask[4]; 345 /* fall-through */ 346 case 3: 347 dst[packno_off + 2] ^= mask[3]; 348 /* fall-through */ 349 case 2: 350 dst[packno_off + 1] ^= mask[2]; 351 /* fall-through */ 352 default: 353 dst[packno_off + 0] ^= mask[1]; 354 } 355} 356 357 358static lsquic_packno_t 359decode_packno (lsquic_packno_t max_packno, lsquic_packno_t packno, 360 unsigned shift) 361{ 362 lsquic_packno_t candidates[3], epoch_delta; 363 int64_t diffs[3]; 364 unsigned min;; 365 366 epoch_delta = 1ULL << shift; 367 candidates[1] = (max_packno & ~(epoch_delta - 1)) + packno; 368 candidates[0] = candidates[1] - epoch_delta; 369 candidates[2] = candidates[1] + epoch_delta; 370 371 diffs[0] = llabs((int64_t) candidates[0] - (int64_t) max_packno); 372 diffs[1] = llabs((int64_t) candidates[1] - (int64_t) max_packno); 373 diffs[2] = llabs((int64_t) candidates[2] - (int64_t) max_packno); 374 375 min = diffs[1] < diffs[0]; 376 if (diffs[2] < diffs[min]) 377 min = 2; 378 379 return candidates[min]; 380} 381 382 383static lsquic_packno_t 384strip_hp (struct enc_sess_iquic *enc_sess, 385 const struct header_prot *hp, unsigned cliser, 386 const unsigned char *iv, unsigned char *dst, unsigned packno_off, 387 unsigned *packno_len) 388{ 389 enum packnum_space pns; 390 lsquic_packno_t packno; 391 unsigned shift; 392 unsigned char mask[EVP_MAX_BLOCK_LENGTH]; 393 char mask_str[5 * 2 + 1]; 394 395 hp->hp_gen_mask(enc_sess, hp, cliser, iv, mask); 396 LSQ_DEBUG("strip header protection using mask %s", 397 HEXSTR(mask, 5, mask_str)); 398 if (enc_sess->esi_flags & ESI_QL_BITS) 399 dst[0] ^= (0x7 | ((dst[0] >> 7) << 3)) & mask[0]; 400 else 401 dst[0] ^= (0xF | (((dst[0] & 0x80) == 0) << 4)) & mask[0]; 402 packno = 0; 403 shift = 0; 404 *packno_len = 1 + (dst[0] & 3); 405 switch (*packno_len) 406 { 407 case 4: 408 dst[packno_off + 3] ^= mask[4]; 409 packno |= dst[packno_off + 3]; 410 shift += 8; 411 /* fall-through */ 412 case 3: 413 dst[packno_off + 2] ^= mask[3]; 414 packno |= dst[packno_off + 2] << shift; 415 shift += 8; 416 /* fall-through */ 417 case 2: 418 dst[packno_off + 1] ^= mask[2]; 419 packno |= dst[packno_off + 1] << shift; 420 shift += 8; 421 /* fall-through */ 422 default: 423 dst[packno_off + 0] ^= mask[1]; 424 packno |= dst[packno_off + 0] << shift; 425 shift += 8; 426 } 427 pns = lsquic_enclev2pns[hp->hp_enc_level]; 428 return decode_packno(enc_sess->esi_max_packno[pns], packno, shift); 429} 430 431 432static int 433gen_trans_params (struct enc_sess_iquic *enc_sess, unsigned char *buf, 434 size_t bufsz) 435{ 436 const struct lsquic_engine_settings *const settings = 437 &enc_sess->esi_enpub->enp_settings; 438 struct transport_params params; 439 int len; 440 441 memset(¶ms, 0, sizeof(params)); 442 if (enc_sess->esi_flags & ESI_SERVER) 443 { 444 const struct lsquic_conn *const lconn = enc_sess->esi_conn; 445 446 params.tp_flags |= TRAPA_SERVER|TRAPA_RESET_TOKEN; 447 448 lsquic_tg_generate_sreset(enc_sess->esi_enpub->enp_tokgen, 449 CN_SCID(lconn), params.tp_stateless_reset_token); 450 451 if (enc_sess->esi_flags & ESI_ODCID) 452 { 453 params.tp_original_cid = enc_sess->esi_odcid; 454 params.tp_flags |= TRAPA_ORIGINAL_CID; 455 } 456#if LSQUIC_PREFERRED_ADDR 457 char addr_buf[INET6_ADDRSTRLEN + 6 /* port */ + 1]; 458 const char *s, *colon; 459 struct lsquic_conn *conn; 460 struct conn_cid_elem *cce; 461 unsigned seqno; 462 s = getenv("LSQUIC_PREFERRED_ADDR4"); 463 if (s && strlen(s) < sizeof(addr_buf) && (colon = strchr(s, ':'))) 464 { 465 strncpy(addr_buf, s, colon - s); 466 addr_buf[colon - s] = '\0'; 467 inet_pton(AF_INET, addr_buf, params.tp_preferred_address.ipv4_addr); 468 params.tp_preferred_address.ipv4_port = atoi(colon + 1); 469 params.tp_flags |= TRAPA_PREFADDR_IPv4; 470 } 471 s = getenv("LSQUIC_PREFERRED_ADDR6"); 472 if (s && strlen(s) < sizeof(addr_buf) && (colon = strrchr(s, ':'))) 473 { 474 strncpy(addr_buf, s, colon - s); 475 addr_buf[colon - s] = '\0'; 476 inet_pton(AF_INET6, addr_buf, 477 params.tp_preferred_address.ipv6_addr); 478 params.tp_preferred_address.ipv6_port = atoi(colon + 1); 479 params.tp_flags |= TRAPA_PREFADDR_IPv6; 480 } 481 conn = enc_sess->esi_conn; 482 if ((params.tp_flags & (TRAPA_PREFADDR_IPv4|TRAPA_PREFADDR_IPv6)) 483 && (1 << conn->cn_n_cces) - 1 != conn->cn_cces_mask) 484 { 485 seqno = 0; 486 for (cce = lconn->cn_cces; cce < END_OF_CCES(lconn); ++cce) 487 { 488 if (lconn->cn_cces_mask & (1 << (cce - lconn->cn_cces))) 489 { 490 if ((cce->cce_flags & CCE_SEQNO) && cce->cce_seqno > seqno) 491 seqno = cce->cce_seqno; 492 } 493 else 494 break; 495 } 496 if (cce == END_OF_CCES(lconn)) 497 { 498 goto cant_use_prefaddr; 499 } 500 cce->cce_seqno = seqno + 1; 501 cce->cce_flags = CCE_SEQNO; 502 lsquic_generate_cid(&cce->cce_cid, 503 enc_sess->esi_enpub->enp_settings.es_scid_len); 504 /* Don't add to hash: migration must not start until *after* 505 * handshake is complete. 506 */ 507 conn->cn_cces_mask |= 1 << (cce - conn->cn_cces); 508 params.tp_preferred_address.cid = cce->cce_cid; 509 lsquic_tg_generate_sreset(enc_sess->esi_enpub->enp_tokgen, 510 ¶ms.tp_preferred_address.cid, 511 params.tp_preferred_address.srst); 512 } 513 else 514 { 515 cant_use_prefaddr: 516 params.tp_flags &= ~(TRAPA_PREFADDR_IPv4|TRAPA_PREFADDR_IPv6); 517 } 518#endif 519 } 520#if LSQUIC_TEST_QUANTUM_READINESS 521 else 522 { 523 const char *s = getenv("LSQUIC_TEST_QUANTUM_READINESS"); 524 if (s && atoi(s)) 525 params.tp_flags |= TRAPA_QUANTUM_READY; 526 } 527#endif 528 params.tp_init_max_data = settings->es_init_max_data; 529 params.tp_init_max_stream_data_bidi_local 530 = settings->es_init_max_stream_data_bidi_local; 531 params.tp_init_max_stream_data_bidi_remote 532 = settings->es_init_max_stream_data_bidi_remote; 533 params.tp_init_max_stream_data_uni 534 = settings->es_init_max_stream_data_uni; 535 params.tp_init_max_streams_uni 536 = enc_sess->esi_max_streams_uni; 537 params.tp_init_max_streams_bidi 538 = settings->es_init_max_streams_bidi; 539 params.tp_ack_delay_exponent 540 = TP_DEF_ACK_DELAY_EXP; 541 params.tp_idle_timeout = settings->es_idle_timeout * 1000; 542 params.tp_max_ack_delay = TP_DEF_MAX_ACK_DELAY; 543 params.tp_max_packet_size = 1370 /* XXX: based on socket */; 544 params.tp_active_connection_id_limit = MAX_IETF_CONN_DCIDS 545 - 1 /* One slot is used by peer's SCID */ 546 - !!(params.tp_flags & (TRAPA_PREFADDR_IPv4|TRAPA_PREFADDR_IPv6)); 547 if (!settings->es_allow_migration) 548 params.tp_disable_active_migration = 1; 549 if (settings->es_ql_bits) 550 params.tp_flags |= TRAPA_QL_BITS; 551 552 len = lsquic_tp_encode(¶ms, buf, bufsz); 553 if (len >= 0) 554 LSQ_DEBUG("generated transport parameters buffer of %d bytes", len); 555 else 556 LSQ_WARN("cannot generate transport parameters: %d", errno); 557 return len; 558} 559 560 561/* 562 * Format: 563 * uint32_t lsquic_ver_tag_t 564 * uint32_t encoder version 565 * uint32_t ticket_size 566 * uint8_t ticket_buf[ ticket_size ] 567 * uint32_t trapa_size 568 * uint8_t trapa_buf[ trapa_size ] 569 */ 570 571#define ZERO_RTT_VERSION 1 572 573#if __BYTE_ORDER == __LITTLE_ENDIAN 574#define READ_NUM(var_, ptr_) do { \ 575 memcpy(&var_, ptr_, sizeof(var_)); \ 576 var_ = bswap_32(var_); \ 577 ptr_ += sizeof(var_); \ 578} while (0) 579#else 580#define READ_NUM(var_, ptr_) do { \ 581 memcpy(&var_, ptr_, sizeof(var_)); \ 582 ptr_ += sizeof(var_); \ 583} while (0) 584#endif 585 586static SSL_SESSION * 587maybe_create_SSL_SESSION (struct enc_sess_iquic *enc_sess, 588 const SSL_CTX *ssl_ctx) 589{ 590 SSL_SESSION *ssl_session; 591 lsquic_ver_tag_t ver_tag; 592 enum lsquic_version quic_ver; 593 uint32_t rtt_ver, ticket_sz, trapa_sz; 594 const unsigned char *ticket_buf, *trapa_buf, *p; 595 const unsigned char *const end 596 = enc_sess->esi_zero_rtt_buf + enc_sess->esi_zero_rtt_sz; 597 598 if (enc_sess->esi_zero_rtt_sz 599 < sizeof(ver_tag) + sizeof(rtt_ver) + sizeof(ticket_sz)) 600 { 601 LSQ_DEBUG("rtt buf too short"); 602 return NULL; 603 } 604 605 p = enc_sess->esi_zero_rtt_buf; 606 memcpy(&ver_tag, p, sizeof(ver_tag)); 607 p += sizeof(ver_tag); 608 quic_ver = lsquic_tag2ver(ver_tag); 609 if (quic_ver != enc_sess->esi_ver_neg->vn_ver) 610 { 611 LSQ_DEBUG("negotiated version %s does not match that in the zero-rtt " 612 "info buffer", lsquic_ver2str[enc_sess->esi_ver_neg->vn_ver]); 613 return NULL; 614 } 615 616 READ_NUM(rtt_ver, p); 617 if (rtt_ver != ZERO_RTT_VERSION) 618 { 619 LSQ_DEBUG("cannot use zero-rtt buffer: encoded using %"PRIu32", " 620 "while current version is %u", rtt_ver, ZERO_RTT_VERSION); 621 return NULL; 622 } 623 624 READ_NUM(ticket_sz, p); 625 if (p + ticket_sz > end) 626 { 627 LSQ_WARN("truncated ticket buffer"); 628 return NULL; 629 } 630 631 ticket_buf = p; 632 p += ticket_sz; 633 634 if (p + sizeof(trapa_sz) > end) 635 { 636 LSQ_WARN("too short to read trapa size"); 637 return NULL; 638 } 639 640 READ_NUM(trapa_sz, p); 641 if (p + trapa_sz > end) 642 { 643 LSQ_WARN("truncated trapa buffer"); 644 return NULL; 645 } 646 trapa_buf = p; 647 p += trapa_sz; 648 assert(p == end); 649 650 (void) /* TODO */ trapa_buf; 651 652 ssl_session = SSL_SESSION_from_bytes(ticket_buf, ticket_sz, ssl_ctx); 653 if (!ssl_session) 654 { 655 LSQ_WARN("SSL_SESSION could not be parsed out"); 656 return NULL; 657 } 658 659 LSQ_INFO("instantiated SSL_SESSION from serialized buffer"); 660 return ssl_session; 661} 662 663 664static void 665init_frals (struct enc_sess_iquic *enc_sess) 666{ 667 struct frab_list *fral; 668 669 for (fral = enc_sess->esi_frals; fral < enc_sess->esi_frals 670 + sizeof(enc_sess->esi_frals) / sizeof(enc_sess->esi_frals[0]); 671 ++fral) 672 lsquic_frab_list_init(fral, 0x100, NULL, NULL, NULL); 673} 674 675 676static enc_session_t * 677iquic_esfi_create_client (const char *hostname, 678 struct lsquic_engine_public *enpub, struct lsquic_conn *lconn, 679 const lsquic_cid_t *dcid, const struct ver_neg *ver_neg, 680 void *crypto_streams[4], const struct crypto_stream_if *cryst_if, 681 const unsigned char *zero_rtt, size_t zero_rtt_sz, 682 struct lsquic_alarmset *alset, unsigned max_streams_uni) 683{ 684 struct enc_sess_iquic *enc_sess; 685 686 enc_sess = calloc(1, sizeof(*enc_sess)); 687 if (!enc_sess) 688 return NULL; 689 690 if (hostname) 691 { 692 enc_sess->esi_hostname = strdup(hostname); 693 if (!enc_sess->esi_hostname) 694 { 695 free(enc_sess); 696 return NULL; 697 } 698 } 699 else 700 enc_sess->esi_hostname = NULL; 701 702 enc_sess->esi_enpub = enpub; 703 enc_sess->esi_streams = crypto_streams; 704 enc_sess->esi_cryst_if = cryst_if; 705 enc_sess->esi_conn = lconn; 706 enc_sess->esi_ver_neg = ver_neg; 707 708 enc_sess->esi_dir[0] = evp_aead_seal; 709 enc_sess->esi_dir[1] = evp_aead_open; 710 711 LSQ_DEBUGC("created client, DCID: %"CID_FMT, CID_BITS(dcid)); 712 { 713 const char *log; 714 log = getenv("LSQUIC_LOG_SECRETS"); 715 if (log) 716 { 717 if (atoi(log)) 718 enc_sess->esi_flags |= ESI_LOG_SECRETS; 719 LSQ_DEBUG("will %slog secrets", atoi(log) ? "" : "not "); 720 } 721 } 722 723 init_frals(enc_sess); 724 725 if (0 != setup_handshake_keys(enc_sess, dcid)) 726 { 727 free(enc_sess); 728 return NULL; 729 } 730 731 /* Have to wait until the call to init_client() -- this is when the 732 * result of version negotiation is known. 733 */ 734 if (zero_rtt && zero_rtt_sz) 735 { 736 enc_sess->esi_zero_rtt_buf = malloc(zero_rtt_sz); 737 if (enc_sess->esi_zero_rtt_buf) 738 { 739 memcpy(enc_sess->esi_zero_rtt_buf, zero_rtt, zero_rtt_sz); 740 enc_sess->esi_zero_rtt_sz = zero_rtt_sz; 741 } 742 else 743 enc_sess->esi_zero_rtt_sz = 0; 744 } 745 else 746 { 747 enc_sess->esi_zero_rtt_buf = NULL; 748 enc_sess->esi_zero_rtt_sz = 0; 749 } 750 751 if (enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info) 752 enc_sess->esi_flags |= ESI_WANT_TICKET; 753 enc_sess->esi_alset = alset; 754 lsquic_alarmset_init_alarm(enc_sess->esi_alset, AL_SESS_TICKET, 755 no_sess_ticket, enc_sess); 756 757 enc_sess->esi_max_streams_uni = max_streams_uni; 758 759 return enc_sess; 760} 761 762 763static void 764iquic_esfi_set_streams (enc_session_t *enc_session_p, 765 void *(crypto_streams)[4], const struct crypto_stream_if *cryst_if) 766{ 767 struct enc_sess_iquic *const enc_sess = enc_session_p; 768 enc_sess->esi_streams = crypto_streams; 769 enc_sess->esi_cryst_if = cryst_if; 770} 771 772 773static enc_session_t * 774iquic_esfi_create_server (struct lsquic_engine_public *enpub, 775 struct lsquic_conn *lconn, const lsquic_cid_t *first_dcid, 776 void *(crypto_streams)[4], 777 const struct crypto_stream_if *cryst_if, 778 const struct lsquic_cid *odcid) 779{ 780 struct enc_sess_iquic *enc_sess; 781 782 enc_sess = calloc(1, sizeof(*enc_sess)); 783 if (!enc_sess) 784 return NULL; 785 786#ifndef NDEBUG 787 enc_sess->esi_sni_bypass = getenv("LSQUIC_SNI_BYPASS"); 788#endif 789 790 enc_sess->esi_flags = ESI_SERVER; 791 enc_sess->esi_streams = crypto_streams; 792 enc_sess->esi_cryst_if = cryst_if; 793 enc_sess->esi_enpub = enpub; 794 enc_sess->esi_conn = lconn; 795 796 enc_sess->esi_dir[0] = evp_aead_open; 797 enc_sess->esi_dir[1] = evp_aead_seal; 798 799 if (odcid) 800 { 801 enc_sess->esi_odcid = *odcid; 802 enc_sess->esi_flags |= ESI_ODCID; 803 } 804 805 init_frals(enc_sess); 806 807 { 808 const char *log; 809 log = getenv("LSQUIC_LOG_SECRETS"); 810 if (log) 811 { 812 if (atoi(log)) 813 enc_sess->esi_flags |= ESI_LOG_SECRETS; 814 LSQ_DEBUG("will %slog secrets", atoi(log) ? "" : "not "); 815 } 816 } 817 818 if (0 != setup_handshake_keys(enc_sess, first_dcid)) 819 { 820 free(enc_sess); 821 return NULL; 822 } 823 824 enc_sess->esi_max_streams_uni 825 = enpub->enp_settings.es_init_max_streams_uni; 826 827 return enc_sess; 828} 829 830 831static void 832log_crypto_pair (const struct enc_sess_iquic *enc_sess, 833 const struct crypto_ctx_pair *pair, const char *name) 834{ 835 char hexbuf[EVP_MAX_MD_SIZE * 2 + 1]; 836 LSQ_DEBUG("client %s key: %s", name, 837 HEXSTR(pair->ykp_ctx[0].yk_key_buf, pair->ykp_ctx[0].yk_key_sz, 838 hexbuf)); 839 LSQ_DEBUG("client %s iv: %s", name, 840 HEXSTR(pair->ykp_ctx[0].yk_iv_buf, pair->ykp_ctx[0].yk_iv_sz, 841 hexbuf)); 842 LSQ_DEBUG("server %s key: %s", name, 843 HEXSTR(pair->ykp_ctx[1].yk_key_buf, pair->ykp_ctx[1].yk_key_sz, 844 hexbuf)); 845 LSQ_DEBUG("server %s iv: %s", name, 846 HEXSTR(pair->ykp_ctx[1].yk_iv_buf, pair->ykp_ctx[1].yk_iv_sz, 847 hexbuf)); 848} 849 850 851static void 852log_hp (const struct enc_sess_iquic *enc_sess, 853 const struct header_prot *hp, const char *name) 854{ 855 char hexbuf[EVP_MAX_MD_SIZE * 2 + 1]; 856 LSQ_DEBUG("client %s hp: %s", name, 857 HEXSTR(hp->hp_buf[0], hp->hp_sz, hexbuf)); 858 LSQ_DEBUG("server %s hp: %s", name, 859 HEXSTR(hp->hp_buf[1], hp->hp_sz, hexbuf)); 860} 861 862 863/* [draft-ietf-quic-tls-12] Section 5.3.2 */ 864static int 865setup_handshake_keys (struct enc_sess_iquic *enc_sess, const lsquic_cid_t *cid) 866{ 867 const EVP_MD *const md = EVP_sha256(); 868 const EVP_AEAD *const aead = EVP_aead_aes_128_gcm(); 869 struct crypto_ctx_pair *pair; 870 struct header_prot *hp; 871 size_t hsk_secret_sz; 872 unsigned char hsk_secret[EVP_MAX_MD_SIZE]; 873 unsigned char secret[2][SHA256_DIGEST_LENGTH]; /* client, server */ 874 char hexbuf[EVP_MAX_MD_SIZE * 2 + 1]; 875 876 if (!enc_sess->esi_hsk_pairs) 877 { 878 enc_sess->esi_hsk_pairs = calloc(N_HSK_PAIRS, 879 sizeof(enc_sess->esi_hsk_pairs[0])); 880 enc_sess->esi_hsk_hps = calloc(N_HSK_PAIRS, 881 sizeof(enc_sess->esi_hsk_hps[0])); 882 if (!(enc_sess->esi_hsk_pairs && enc_sess->esi_hsk_hps)) 883 { 884 free(enc_sess->esi_hsk_pairs); 885 free(enc_sess->esi_hsk_hps); 886 return -1; 887 } 888 } 889 pair = &enc_sess->esi_hsk_pairs[ENC_LEV_CLEAR]; 890 pair->ykp_thresh = IQUIC_INVALID_PACKNO; 891 hp = &enc_sess->esi_hsk_hps[ENC_LEV_CLEAR]; 892 893 HKDF_extract(hsk_secret, &hsk_secret_sz, md, cid->idbuf, cid->len, 894 HSK_SALT, HSK_SALT_SZ); 895 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 896 { 897 LSQ_DEBUG("handshake salt: %s", HEXSTR(HSK_SALT, HSK_SALT_SZ, hexbuf)); 898 LSQ_DEBUG("handshake secret: %s", HEXSTR(hsk_secret, hsk_secret_sz, 899 hexbuf)); 900 } 901 902 lsquic_qhkdf_expand(md, hsk_secret, hsk_secret_sz, CLIENT_LABEL, 903 CLIENT_LABEL_SZ, secret[0], sizeof(secret[0])); 904 LSQ_DEBUG("client handshake secret: %s", 905 HEXSTR(secret[0], sizeof(secret[0]), hexbuf)); 906 if (0 != init_crypto_ctx(&pair->ykp_ctx[0], md, aead, secret[0], 907 sizeof(secret[0]), enc_sess->esi_dir[0])) 908 goto err; 909 lsquic_qhkdf_expand(md, hsk_secret, hsk_secret_sz, SERVER_LABEL, 910 SERVER_LABEL_SZ, secret[1], sizeof(secret[1])); 911 LSQ_DEBUG("server handshake secret: %s", 912 HEXSTR(secret[1], sizeof(secret[1]), hexbuf)); 913 if (0 != init_crypto_ctx(&pair->ykp_ctx[1], md, aead, secret[1], 914 sizeof(secret[1]), enc_sess->esi_dir[1])) 915 goto err; 916 917 /* [draft-ietf-quic-tls-12] Section 5.6.1: AEAD_AES_128_GCM implies 918 * 128-bit AES-CTR. 919 */ 920 hp->hp_cipher = EVP_aes_128_ecb(); 921 hp->hp_gen_mask = gen_hp_mask_aes; 922 hp->hp_enc_level = ENC_LEV_CLEAR; 923 derive_hp_secrets(hp, md, aead, sizeof(secret[0]), secret[0], secret[1]); 924 925 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 926 { 927 log_crypto_pair(enc_sess, pair, "handshake"); 928 log_hp(enc_sess, hp, "handshake"); 929 } 930 931 return 0; 932 933 err: 934 cleanup_crypto_ctx(&pair->ykp_ctx[0]); 935 cleanup_crypto_ctx(&pair->ykp_ctx[1]); 936 return -1; 937} 938 939 940static void 941free_handshake_keys (struct enc_sess_iquic *enc_sess) 942{ 943 struct crypto_ctx_pair *pair; 944 945 if (enc_sess->esi_hsk_pairs) 946 { 947 assert(enc_sess->esi_hsk_hps); 948 for (pair = enc_sess->esi_hsk_pairs; pair < 949 enc_sess->esi_hsk_pairs + N_HSK_PAIRS; ++pair) 950 { 951 cleanup_crypto_ctx(&pair->ykp_ctx[0]); 952 cleanup_crypto_ctx(&pair->ykp_ctx[1]); 953 } 954 free(enc_sess->esi_hsk_pairs); 955 enc_sess->esi_hsk_pairs = NULL; 956 free(enc_sess->esi_hsk_hps); 957 enc_sess->esi_hsk_hps = NULL; 958 } 959 else 960 assert(!enc_sess->esi_hsk_hps); 961} 962 963 964static void 965keylog_callback (const SSL *ssl, const char *line) 966{ 967 struct enc_sess_iquic *enc_sess; 968 969 enc_sess = SSL_get_ex_data(ssl, s_idx); 970 if (enc_sess->esi_keylog_handle) 971 enc_sess->esi_enpub->enp_kli->kli_log_line( 972 enc_sess->esi_keylog_handle, line); 973} 974 975 976static void 977maybe_setup_key_logging (struct enc_sess_iquic *enc_sess) 978{ 979 if (enc_sess->esi_enpub->enp_kli) 980 { 981 enc_sess->esi_keylog_handle = enc_sess->esi_enpub->enp_kli->kli_open( 982 enc_sess->esi_enpub->enp_kli_ctx, enc_sess->esi_conn); 983 LSQ_DEBUG("SSL keys %s be logged", 984 enc_sess->esi_keylog_handle ? "will" : "will not"); 985 } 986} 987 988 989static enum ssl_verify_result_t 990verify_server_cert_callback (SSL *ssl, uint8_t *out_alert) 991{ 992 struct enc_sess_iquic *enc_sess; 993 struct stack_st_X509 *chain; 994 int s; 995 996 enc_sess = SSL_get_ex_data(ssl, s_idx); 997 chain = SSL_get_peer_cert_chain(ssl); 998 if (!chain) 999 { 1000 LSQ_ERROR("cannot get peer chain"); 1001 return ssl_verify_invalid; 1002 } 1003 1004 s = enc_sess->esi_enpub->enp_verify_cert( 1005 enc_sess->esi_enpub->enp_verify_ctx, chain); 1006 return s == 0 ? ssl_verify_ok : ssl_verify_invalid; 1007} 1008 1009 1010static int 1011iquic_lookup_cert (SSL *ssl, void *arg) 1012{ 1013 struct enc_sess_iquic *const enc_sess = arg; 1014 const struct network_path *path; 1015 const char *server_name; 1016 SSL_CTX *ssl_ctx; 1017 1018 server_name = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name); 1019#ifndef NDEBUG 1020 if (!server_name) 1021 server_name = enc_sess->esi_sni_bypass; 1022#endif 1023 if (!server_name) 1024 { 1025 LSQ_DEBUG("cert lookup: server name is not set, skip"); 1026 return 1; 1027 } 1028 1029 path = enc_sess->esi_conn->cn_if->ci_get_path(enc_sess->esi_conn, NULL); 1030 ssl_ctx = enc_sess->esi_enpub->enp_lookup_cert( 1031 enc_sess->esi_enpub->enp_cert_lu_ctx, NP_LOCAL_SA(path), 1032 server_name); 1033 1034 1035 if (ssl_ctx) 1036 { 1037 if (SSL_set_SSL_CTX(enc_sess->esi_ssl, ssl_ctx)) 1038 { 1039 LSQ_DEBUG("looked up cert for %s", server_name); 1040 if (enc_sess->esi_enpub->enp_kli) 1041 SSL_CTX_set_keylog_callback(ssl_ctx, keylog_callback); 1042 SSL_set_verify(enc_sess->esi_ssl, 1043 SSL_CTX_get_verify_mode(ssl_ctx), NULL); 1044 SSL_set_verify_depth(enc_sess->esi_ssl, 1045 SSL_CTX_get_verify_depth(ssl_ctx)); 1046 SSL_clear_options(enc_sess->esi_ssl, 1047 SSL_get_options(enc_sess->esi_ssl)); 1048 SSL_set_options(enc_sess->esi_ssl, 1049 SSL_CTX_get_options(ssl_ctx) & ~SSL_OP_NO_TLSv1_3); 1050 return 1; 1051 } 1052 else 1053 { 1054 LSQ_WARN("cannot set SSL_CTX"); 1055 return 0; 1056 } 1057 } 1058 else 1059 { 1060 LSQ_DEBUG("could not look up cert for %s", server_name); 1061 return 0; 1062 } 1063} 1064 1065 1066static void 1067iquic_esf_set_conn (enc_session_t *enc_session_p, struct lsquic_conn *lconn) 1068{ 1069 struct enc_sess_iquic *const enc_sess = enc_session_p; 1070 enc_sess->esi_conn = lconn; 1071 LSQ_DEBUG("updated conn reference"); 1072} 1073 1074 1075static int 1076iquic_esfi_init_server (enc_session_t *enc_session_p) 1077{ 1078 struct enc_sess_iquic *const enc_sess = enc_session_p; 1079 const struct alpn_map *am; 1080 int transpa_len; 1081 SSL_CTX *ssl_ctx = NULL; 1082 union { 1083 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1084 unsigned char trans_params[sizeof(struct transport_params)]; 1085 } u; 1086 1087 for (am = s_alpns; am < s_alpns + sizeof(s_alpns) 1088 / sizeof(s_alpns[0]); ++am) 1089 if (am->version == enc_sess->esi_conn->cn_version) 1090 goto ok; 1091 1092 LSQ_ERROR("version %s has no matching ALPN", 1093 lsquic_ver2str[enc_sess->esi_conn->cn_version]); 1094 return -1; 1095 1096 ok: 1097 enc_sess->esi_alpn = am->alpn; 1098 1099 ssl_ctx = enc_sess->esi_enpub->enp_get_ssl_ctx( 1100 lsquic_conn_get_peer_ctx(enc_sess->esi_conn, NULL)); 1101 if (!ssl_ctx) 1102 { 1103 LSQ_ERROR("fetching SSL context associated with peer context failed"); 1104 return -1; 1105 } 1106 1107 enc_sess->esi_ssl = SSL_new(ssl_ctx); 1108 if (!enc_sess->esi_ssl) 1109 { 1110 LSQ_ERROR("cannot create SSL object: %s", 1111 ERR_error_string(ERR_get_error(), u.errbuf)); 1112 return -1; 1113 } 1114 if (!(SSL_set_quic_method(enc_sess->esi_ssl, &cry_quic_method))) 1115 { 1116 LSQ_INFO("could not set stream method"); 1117 return -1; 1118 } 1119 maybe_setup_key_logging(enc_sess); 1120 1121 transpa_len = gen_trans_params(enc_sess, u.trans_params, 1122 sizeof(u.trans_params)); 1123 if (transpa_len < 0) 1124 return -1; 1125 1126 if (1 != SSL_set_quic_transport_params(enc_sess->esi_ssl, u.trans_params, 1127 transpa_len)) 1128 { 1129 LSQ_ERROR("cannot set QUIC transport params: %s", 1130 ERR_error_string(ERR_get_error(), u.errbuf)); 1131 return -1; 1132 } 1133 1134 SSL_clear_options(enc_sess->esi_ssl, SSL_OP_NO_TLSv1_3); 1135 SSL_set_cert_cb(enc_sess->esi_ssl, iquic_lookup_cert, enc_sess); 1136 SSL_set_ex_data(enc_sess->esi_ssl, s_idx, enc_sess); 1137 SSL_set_accept_state(enc_sess->esi_ssl); 1138 LSQ_DEBUG("initialized server enc session"); 1139 enc_sess->esi_flags |= ESI_INITIALIZED; 1140 return 0; 1141} 1142 1143 1144#if __BYTE_ORDER == __LITTLE_ENDIAN 1145#define WRITE_NUM(var_, val_, ptr_) do { \ 1146 var_ = (val_); \ 1147 var_ = bswap_32(var_); \ 1148 memcpy((ptr_), &var_, sizeof(var_)); \ 1149 ptr_ += sizeof(var_); \ 1150} while (0) 1151#else 1152#define WRITE_NUM(var_, val_, ptr_) do { \ 1153 var_ = (val_); \ 1154 memcpy((ptr_), &var_, sizeof(var_)); \ 1155 ptr_ += sizeof(var_); \ 1156} while (0) 1157#endif 1158 1159static int 1160iquic_new_session_cb (SSL *ssl, SSL_SESSION *session) 1161{ 1162 struct enc_sess_iquic *enc_sess; 1163 uint32_t num; 1164 unsigned char *p, *buf; 1165 uint8_t *ticket_buf; 1166 size_t ticket_sz; 1167 lsquic_ver_tag_t tag; 1168 const uint8_t *trapa_buf; 1169 size_t trapa_sz, buf_sz; 1170 1171 enc_sess = SSL_get_ex_data(ssl, s_idx); 1172 assert(enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info); 1173 1174 SSL_get_peer_quic_transport_params(enc_sess->esi_ssl, &trapa_buf, 1175 &trapa_sz); 1176 if (!(trapa_buf + trapa_sz)) 1177 { 1178 LSQ_WARN("no transport parameters: cannot generate zero-rtt info"); 1179 return 0; 1180 } 1181 if (trapa_sz > UINT32_MAX) 1182 { 1183 LSQ_WARN("trapa size too large: %zu", trapa_sz); 1184 return 0; 1185 } 1186 1187 if (!SSL_SESSION_to_bytes(session, &ticket_buf, &ticket_sz)) 1188 { 1189 LSQ_INFO("could not serialize new session"); 1190 return 0; 1191 } 1192 if (ticket_sz > UINT32_MAX) 1193 { 1194 LSQ_WARN("ticket size too large: %zu", ticket_sz); 1195 OPENSSL_free(ticket_buf); 1196 return 0; 1197 } 1198 1199 buf_sz = sizeof(tag) + sizeof(uint32_t) + sizeof(uint32_t) 1200 + ticket_sz + sizeof(uint32_t) + trapa_sz; 1201 buf = malloc(buf_sz); 1202 if (!buf) 1203 { 1204 OPENSSL_free(ticket_buf); 1205 LSQ_WARN("%s: malloc failed", __func__); 1206 return 0; 1207 } 1208 1209 p = buf; 1210 tag = lsquic_ver2tag(enc_sess->esi_conn->cn_version); 1211 memcpy(p, &tag, sizeof(tag)); 1212 p += sizeof(tag); 1213 1214 WRITE_NUM(num, ZERO_RTT_VERSION, p); 1215 WRITE_NUM(num, ticket_sz, p); 1216 memcpy(p, ticket_buf, ticket_sz); 1217 p += ticket_sz; 1218 WRITE_NUM(num, trapa_sz, p); 1219 memcpy(p, trapa_buf, trapa_sz); 1220 p += trapa_sz; 1221 1222 assert(buf + buf_sz == p); 1223 OPENSSL_free(ticket_buf); 1224 1225 LSQ_DEBUG("generated %zu bytes of zero-rtt buffer", buf_sz); 1226 1227 enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info(enc_sess->esi_conn, 1228 buf, buf_sz); 1229 free(buf); 1230 enc_sess->esi_flags &= ~ESI_WANT_TICKET; 1231 lsquic_alarmset_unset(enc_sess->esi_alset, AL_SESS_TICKET); 1232 return 0; 1233} 1234 1235 1236static int 1237init_client (struct enc_sess_iquic *const enc_sess) 1238{ 1239 SSL_CTX *ssl_ctx; 1240 SSL_SESSION *ssl_session; 1241 const struct alpn_map *am; 1242 int transpa_len; 1243 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1244#define hexbuf errbuf /* This is a dual-purpose buffer */ 1245 unsigned char trans_params[0x80 1246#if LSQUIC_TEST_QUANTUM_READINESS 1247 + 4 + QUANTUM_READY_SZ 1248#endif 1249 ]; 1250 1251 for (am = s_alpns; am < s_alpns + sizeof(s_alpns) 1252 / sizeof(s_alpns[0]); ++am) 1253 if (am->version == enc_sess->esi_ver_neg->vn_ver) 1254 goto ok; 1255 1256 LSQ_ERROR("version %s has no matching ALPN", 1257 lsquic_ver2str[enc_sess->esi_ver_neg->vn_ver]); 1258 return -1; 1259 1260 ok: 1261 enc_sess->esi_alpn = am->alpn; 1262 LSQ_DEBUG("Create new SSL_CTX"); 1263 ssl_ctx = SSL_CTX_new(TLS_method()); 1264 if (!ssl_ctx) 1265 { 1266 LSQ_ERROR("cannot create SSL context: %s", 1267 ERR_error_string(ERR_get_error(), errbuf)); 1268 goto err; 1269 } 1270 SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_3_VERSION); 1271 SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION); 1272 SSL_CTX_set_default_verify_paths(ssl_ctx); 1273 SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_CLIENT); 1274 if (enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info) 1275 SSL_CTX_sess_set_new_cb(ssl_ctx, iquic_new_session_cb); 1276 if (enc_sess->esi_enpub->enp_kli) 1277 SSL_CTX_set_keylog_callback(ssl_ctx, keylog_callback); 1278 if (enc_sess->esi_enpub->enp_verify_cert) 1279 SSL_CTX_set_custom_verify(ssl_ctx, SSL_VERIFY_PEER, 1280 verify_server_cert_callback); 1281 SSL_CTX_set_early_data_enabled(ssl_ctx, 1); 1282 1283 transpa_len = gen_trans_params(enc_sess, trans_params, 1284 sizeof(trans_params)); 1285 if (transpa_len < 0) 1286 { 1287 goto err; 1288 } 1289 1290 enc_sess->esi_ssl = SSL_new(ssl_ctx); 1291 if (!enc_sess->esi_ssl) 1292 { 1293 LSQ_ERROR("cannot create SSL object: %s", 1294 ERR_error_string(ERR_get_error(), errbuf)); 1295 goto err; 1296 } 1297 if (!(SSL_set_quic_method(enc_sess->esi_ssl, &cry_quic_method))) 1298 { 1299 LSQ_INFO("could not set stream method"); 1300 goto err; 1301 } 1302 maybe_setup_key_logging(enc_sess); 1303 if (1 != SSL_set_quic_transport_params(enc_sess->esi_ssl, trans_params, 1304 transpa_len)) 1305 { 1306 LSQ_ERROR("cannot set QUIC transport params: %s", 1307 ERR_error_string(ERR_get_error(), errbuf)); 1308 goto err; 1309 } 1310 if (0 != SSL_set_alpn_protos(enc_sess->esi_ssl, am->alpn, am->alpn[0] + 1)) 1311 { 1312 LSQ_ERROR("cannot set ALPN: %s", 1313 ERR_error_string(ERR_get_error(), errbuf)); 1314 goto err; 1315 } 1316 if (1 != SSL_set_tlsext_host_name(enc_sess->esi_ssl, 1317 enc_sess->esi_hostname)) 1318 { 1319 LSQ_ERROR("cannot set hostname: %s", 1320 ERR_error_string(ERR_get_error(), errbuf)); 1321 goto err; 1322 } 1323 free(enc_sess->esi_hostname); 1324 enc_sess->esi_hostname = NULL; 1325 if (enc_sess->esi_zero_rtt_buf) 1326 { 1327 ssl_session = maybe_create_SSL_SESSION(enc_sess, ssl_ctx); 1328 if (ssl_session) 1329 { 1330 if (SSL_set_session(enc_sess->esi_ssl, ssl_session)) 1331 enc_sess->esi_flags |= ESI_USE_SSL_TICKET; 1332 else 1333 LSQ_WARN("cannot set session"); 1334 } 1335 } 1336 1337 SSL_set_ex_data(enc_sess->esi_ssl, s_idx, enc_sess); 1338 SSL_set_connect_state(enc_sess->esi_ssl); 1339 SSL_CTX_free(ssl_ctx); 1340 LSQ_DEBUG("initialized client enc session"); 1341 enc_sess->esi_flags |= ESI_INITIALIZED; 1342 return 0; 1343 1344 err: 1345 if (ssl_ctx) 1346 SSL_CTX_free(ssl_ctx); 1347 return -1; 1348#undef hexbuf 1349} 1350 1351 1352struct crypto_params 1353{ 1354 const EVP_AEAD *aead; 1355 const EVP_MD *md; 1356 const EVP_CIPHER *hp; 1357 gen_hp_mask_f gen_hp_mask; 1358}; 1359 1360 1361static int 1362get_crypto_params (const struct enc_sess_iquic *enc_sess, 1363 struct crypto_params *params) 1364{ 1365 const SSL_CIPHER *cipher; 1366 unsigned key_sz, iv_sz; 1367 uint32_t id; 1368 1369 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 1370 id = SSL_CIPHER_get_id(cipher); 1371 1372 LSQ_DEBUG("Negotiated cipher ID is 0x%"PRIX32, id); 1373 1374 /* RFC 8446, Appendix B.4 */ 1375 switch (id) 1376 { 1377 case 0x03000000 | 0x1301: /* TLS_AES_128_GCM_SHA256 */ 1378 params->md = EVP_sha256(); 1379 params->aead = EVP_aead_aes_128_gcm(); 1380 params->hp = EVP_aes_128_ecb(); 1381 params->gen_hp_mask = gen_hp_mask_aes; 1382 break; 1383 case 0x03000000 | 0x1302: /* TLS_AES_256_GCM_SHA384 */ 1384 params->md = EVP_sha384(); 1385 params->aead = EVP_aead_aes_256_gcm(); 1386 params->hp = EVP_aes_256_ecb(); 1387 params->gen_hp_mask = gen_hp_mask_aes; 1388 break; 1389 case 0x03000000 | 0x1303: /* TLS_CHACHA20_POLY1305_SHA256 */ 1390 params->md = EVP_sha256(); 1391 params->aead = EVP_aead_chacha20_poly1305(); 1392 params->hp = NULL; 1393 params->gen_hp_mask = gen_hp_mask_chacha20; 1394 break; 1395 default: 1396 /* TLS_AES_128_CCM_SHA256 and TLS_AES_128_CCM_8_SHA256 are not 1397 * supported by BoringSSL (grep for \b0x130[45]\b). 1398 */ 1399 LSQ_DEBUG("unsupported cipher 0x%"PRIX32, id); 1400 return -1; 1401 } 1402 1403 key_sz = EVP_AEAD_key_length(params->aead); 1404 if (key_sz > EVP_MAX_KEY_LENGTH) 1405 { 1406 LSQ_DEBUG("key size %u is too large", key_sz); 1407 return -1; 1408 } 1409 1410 iv_sz = EVP_AEAD_nonce_length(params->aead); 1411 if (iv_sz < 8) 1412 iv_sz = 8; /* [draft-ietf-quic-tls-11], Section 5.3 */ 1413 if (iv_sz > EVP_MAX_IV_LENGTH) 1414 { 1415 LSQ_DEBUG("iv size %u is too large", iv_sz); 1416 return -1; 1417 } 1418 1419 if (key_sz > EVP_MAX_KEY_LENGTH) 1420 { 1421 LSQ_DEBUG("PN size %u is too large", key_sz); 1422 return -1; 1423 } 1424 1425 return 0; 1426} 1427 1428 1429static int 1430get_peer_transport_params (struct enc_sess_iquic *enc_sess) 1431{ 1432 struct transport_params *const trans_params = &enc_sess->esi_peer_tp; 1433 const uint8_t *params_buf; 1434 size_t bufsz; 1435 char params_str[0x200]; 1436 1437 SSL_get_peer_quic_transport_params(enc_sess->esi_ssl, ¶ms_buf, &bufsz); 1438 if (!params_buf) 1439 { 1440 LSQ_DEBUG("no peer transport parameters"); 1441 return -1; 1442 } 1443 1444 LSQ_DEBUG("have peer transport parameters (%zu bytes)", bufsz); 1445 if (0 > lsquic_tp_decode(params_buf, bufsz, 1446 !(enc_sess->esi_flags & ESI_SERVER), 1447 trans_params)) 1448 { 1449 lsquic_hexdump(params_buf, bufsz, params_str, sizeof(params_str)); 1450 LSQ_DEBUG("could not parse peer transport parameters (%zd bytes):\n%s", 1451 bufsz, params_str); 1452 return -1; 1453 } 1454 1455 if ((enc_sess->esi_flags & (ESI_ODCID|ESI_SERVER)) == ESI_ODCID) 1456 { 1457 if (!(trans_params->tp_flags & TRAPA_ORIGINAL_CID)) 1458 { 1459 LSQ_DEBUG("server did not produce original DCID (ODCID)"); 1460 return -1; 1461 } 1462 if (LSQUIC_CIDS_EQ(&enc_sess->esi_odcid, 1463 &trans_params->tp_original_cid)) 1464 LSQ_DEBUG("ODCID values match"); 1465 else 1466 { 1467 if (LSQ_LOG_ENABLED(LSQ_LOG_DEBUG)) 1468 { 1469 char cidbuf[2][MAX_CID_LEN * 2 + 1]; 1470 lsquic_cid2str(&enc_sess->esi_odcid, cidbuf[0]); 1471 lsquic_cid2str(&trans_params->tp_original_cid, cidbuf[1]); 1472 LSQ_DEBUG("server provided ODCID %s that does not match " 1473 "our ODCID %s", cidbuf[1], cidbuf[0]); 1474 } 1475 return -1; 1476 } 1477 } 1478 1479 if ((trans_params->tp_flags & TRAPA_QL_BITS) 1480 && enc_sess->esi_enpub->enp_settings.es_ql_bits) 1481 { 1482 LSQ_DEBUG("enable QL loss bits"); 1483 enc_sess->esi_flags |= ESI_QL_BITS; 1484 } 1485 1486 return 0; 1487} 1488 1489 1490static int 1491maybe_get_peer_transport_params (struct enc_sess_iquic *enc_sess) 1492{ 1493 int s; 1494 1495 if (enc_sess->esi_flags & ESI_HAVE_PEER_TP) 1496 return 0; 1497 1498 s = get_peer_transport_params(enc_sess); 1499 if (s == 0) 1500 enc_sess->esi_flags |= ESI_HAVE_PEER_TP; 1501 1502 return s; 1503} 1504 1505 1506static enum iquic_handshake_status 1507iquic_esfi_handshake (struct enc_sess_iquic *enc_sess) 1508{ 1509 int s, err; 1510 enum lsquic_hsk_status hsk_status; 1511 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1512 1513 s = SSL_do_handshake(enc_sess->esi_ssl); 1514 if (s <= 0) 1515 { 1516 err = SSL_get_error(enc_sess->esi_ssl, s); 1517 switch (err) 1518 { 1519 case SSL_ERROR_WANT_READ: 1520 LSQ_DEBUG("retry read"); 1521 return IHS_WANT_READ; 1522 case SSL_ERROR_WANT_WRITE: 1523 LSQ_DEBUG("retry write"); 1524 return IHS_WANT_WRITE; 1525 case SSL_ERROR_EARLY_DATA_REJECTED: 1526 LSQ_DEBUG("early data rejected"); 1527 hsk_status = LSQ_HSK_0RTT_FAIL; 1528 goto err; 1529 default: 1530 LSQ_DEBUG("handshake: %s", ERR_error_string(err, errbuf)); 1531 hsk_status = LSQ_HSK_FAIL; 1532 goto err; 1533 } 1534 } 1535 1536 1537 if (SSL_in_early_data(enc_sess->esi_ssl)) 1538 { 1539 LSQ_DEBUG("in early data"); 1540 if (enc_sess->esi_flags & ESI_SERVER) 1541 LSQ_DEBUG("TODO"); 1542 else 1543 return IHS_WANT_READ; 1544 } 1545 1546 hsk_status = LSQ_HSK_OK; 1547 LSQ_DEBUG("handshake reported complete"); 1548 EV_LOG_HSK_COMPLETED(LSQUIC_LOG_CONN_ID); 1549 /* The ESI_USE_SSL_TICKET flag indicates if the client attempted 0-RTT. 1550 * If the handshake is complete, and the client attempted 0-RTT, it 1551 * must have succeeded. 1552 */ 1553 if (enc_sess->esi_flags & ESI_USE_SSL_TICKET) 1554 { 1555 hsk_status = LSQ_HSK_0RTT_OK; 1556 EV_LOG_ZERO_RTT(LSQUIC_LOG_CONN_ID); 1557 } 1558 1559 if (0 != maybe_get_peer_transport_params(enc_sess)) 1560 { 1561 hsk_status = LSQ_HSK_FAIL; 1562 goto err; 1563 } 1564 1565 enc_sess->esi_flags |= ESI_HANDSHAKE_OK; 1566 enc_sess->esi_conn->cn_if->ci_hsk_done(enc_sess->esi_conn, hsk_status); 1567 1568 return IHS_STOP; /* XXX: what else can come on the crypto stream? */ 1569 1570 err: 1571 LSQ_DEBUG("handshake failed"); 1572 enc_sess->esi_conn->cn_if->ci_hsk_done(enc_sess->esi_conn, hsk_status); 1573 return IHS_STOP; 1574} 1575 1576 1577static enum iquic_handshake_status 1578iquic_esfi_post_handshake (struct enc_sess_iquic *enc_sess) 1579{ 1580 int s; 1581 1582 s = SSL_process_quic_post_handshake(enc_sess->esi_ssl); 1583 LSQ_DEBUG("SSL_process_quic_post_handshake() returned %d", s); 1584 if (s == 1) 1585 return IHS_WANT_READ; 1586 else 1587 { 1588 LSQ_DEBUG("TODO: abort connection?"); 1589 return IHS_STOP; 1590 } 1591} 1592 1593 1594static struct transport_params * 1595iquic_esfi_get_peer_transport_params (enc_session_t *enc_session_p) 1596{ 1597 struct enc_sess_iquic *const enc_sess = enc_session_p; 1598 1599 if (0 == maybe_get_peer_transport_params(enc_sess)) 1600 return &enc_sess->esi_peer_tp; 1601 else 1602 return NULL; 1603} 1604 1605 1606void 1607iquic_esfi_destroy (enc_session_t *enc_session_p) 1608{ 1609 struct enc_sess_iquic *const enc_sess = enc_session_p; 1610 struct frab_list *fral; 1611 LSQ_DEBUG("iquic_esfi_destroy"); 1612 1613 for (fral = enc_sess->esi_frals; fral < enc_sess->esi_frals 1614 + sizeof(enc_sess->esi_frals) / sizeof(enc_sess->esi_frals[0]); 1615 ++fral) 1616 lsquic_frab_list_cleanup(fral); 1617 if (enc_sess->esi_keylog_handle) 1618 enc_sess->esi_enpub->enp_kli->kli_close(enc_sess->esi_keylog_handle); 1619 if (enc_sess->esi_ssl) 1620 SSL_free(enc_sess->esi_ssl); 1621 1622 free_handshake_keys(enc_sess); 1623 1624 free(enc_sess->esi_zero_rtt_buf); 1625 free(enc_sess->esi_hostname); 1626 free(enc_sess); 1627} 1628 1629 1630/* See [draft-ietf-quic-tls-14], Section 4 */ 1631static const enum enc_level hety2el[] = 1632{ 1633 [HETY_NOT_SET] = ENC_LEV_FORW, 1634 [HETY_VERNEG] = 0, 1635 [HETY_INITIAL] = ENC_LEV_CLEAR, 1636 [HETY_RETRY] = 0, 1637 [HETY_HANDSHAKE] = ENC_LEV_INIT, 1638 [HETY_0RTT] = ENC_LEV_EARLY, 1639}; 1640 1641 1642static const enum header_type pns2hety[] = 1643{ 1644 [PNS_INIT] = HETY_INITIAL, 1645 [PNS_HSK] = HETY_HANDSHAKE, 1646 [PNS_APP] = HETY_NOT_SET, 1647}; 1648 1649 1650static const enum enc_level pns2enc_level[] = 1651{ 1652 [PNS_INIT] = ENC_LEV_CLEAR, 1653 [PNS_HSK] = ENC_LEV_INIT, 1654 [PNS_APP] = ENC_LEV_FORW, 1655}; 1656 1657 1658static enum enc_packout 1659iquic_esf_encrypt_packet (enc_session_t *enc_session_p, 1660 const struct lsquic_engine_public *enpub, struct lsquic_conn *lconn_UNUSED, 1661 struct lsquic_packet_out *packet_out) 1662{ 1663 struct enc_sess_iquic *const enc_sess = enc_session_p; 1664 struct lsquic_conn *const lconn = enc_sess->esi_conn; 1665 unsigned char *dst; 1666 const struct crypto_ctx_pair *pair; 1667 const struct crypto_ctx *crypto_ctx; 1668 const struct header_prot *hp; 1669 enum enc_level enc_level; 1670 unsigned char nonce_buf[ sizeof(crypto_ctx->yk_iv_buf) + 8 ]; 1671 unsigned char *nonce, *begin_xor; 1672 lsquic_packno_t packno; 1673 size_t out_sz, dst_sz; 1674 int header_sz; 1675 int ipv6; 1676 unsigned packno_off, packno_len, cliser; 1677 enum packnum_space pns; 1678 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1679 1680 if (packet_out->po_flags & PO_MINI) 1681 { 1682 /* XXX TODO Don't rely on PO_MINI, generalize this logic */ 1683 assert(enc_sess->esi_flags & ESI_SERVER); 1684 enc_level = hety2el[ packet_out->po_header_type ]; 1685 } 1686 else 1687 { 1688 pns = lsquic_packet_out_pns(packet_out); 1689 /* TODO Obviously, will need more logic for 0-RTT */ 1690 enc_level = pns2enc_level[ pns ]; 1691 packet_out->po_header_type = pns2hety[ pns ]; 1692 } 1693 1694 cliser = !!(enc_sess->esi_flags & ESI_SERVER); 1695 if (enc_level == ENC_LEV_FORW) 1696 { 1697 pair = &enc_sess->esi_pairs[ enc_sess->esi_key_phase ]; 1698 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1699 hp = &enc_sess->esi_hp; 1700 } 1701 else if (enc_sess->esi_hsk_pairs) 1702 { 1703 pair = &enc_sess->esi_hsk_pairs[ enc_level ]; 1704 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1705 hp = &enc_sess->esi_hsk_hps[ enc_level ]; 1706 } 1707 else 1708 { 1709 LSQ_WARN("no keys for encryption level %s", 1710 lsquic_enclev2str[enc_level]); 1711 return ENCPA_BADCRYPT; 1712 } 1713 1714 if (UNLIKELY(0 == (crypto_ctx->yk_flags & YK_INITED))) 1715 { 1716 LSQ_WARN("encrypt crypto context at level %s not initialized", 1717 lsquic_enclev2str[enc_level]); 1718 return ENCPA_BADCRYPT; 1719 } 1720 1721 if (packet_out->po_data_sz < 3) 1722 { 1723 /* [draft-ietf-quic-tls-20] Section 5.4.2 */ 1724 enum packno_bits bits = lsquic_packet_out_packno_bits(packet_out); 1725 unsigned len = iquic_packno_bits2len(bits); 1726 if (packet_out->po_data_sz + len < 4) 1727 { 1728 len = 4 - packet_out->po_data_sz - len; 1729 memset(packet_out->po_data + packet_out->po_data_sz, 0, len); 1730 packet_out->po_data_sz += len; 1731 packet_out->po_frame_types |= QUIC_FTBIT_PADDING; 1732 LSQ_DEBUG("padded packet %"PRIu64" with %u bytes of PADDING", 1733 packet_out->po_packno, len); 1734 } 1735 } 1736 1737 dst_sz = lconn->cn_pf->pf_packout_size(lconn, packet_out); 1738 ipv6 = NP_IS_IPv6(packet_out->po_path); 1739 dst = enpub->enp_pmi->pmi_allocate(enpub->enp_pmi_ctx, 1740 packet_out->po_path->np_peer_ctx, dst_sz, ipv6); 1741 if (!dst) 1742 { 1743 LSQ_DEBUG("could not allocate memory for outgoing packet of size %zd", 1744 dst_sz); 1745 return ENCPA_NOMEM; 1746 } 1747 1748 /* Align nonce so we can perform XOR safely in one shot: */ 1749 begin_xor = nonce_buf + sizeof(nonce_buf) - 8; 1750 begin_xor = (unsigned char *) ((uintptr_t) begin_xor & ~0x7); 1751 nonce = begin_xor - crypto_ctx->yk_iv_sz + 8; 1752 memcpy(nonce, crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz); 1753 packno = packet_out->po_packno; 1754 if (s_log_seal_and_open) 1755 LSQ_DEBUG("seal: iv: %s; packno: 0x%"PRIX64, 1756 HEXSTR(crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz, s_str), packno); 1757#if __BYTE_ORDER == __LITTLE_ENDIAN 1758 packno = bswap_64(packno); 1759#endif 1760 *((uint64_t *) begin_xor) ^= packno; 1761 1762 header_sz = lconn->cn_pf->pf_gen_reg_pkt_header(lconn, packet_out, dst, 1763 dst_sz); 1764 if (header_sz < 0) 1765 goto err; 1766 if (enc_level == ENC_LEV_FORW) 1767 dst[0] |= enc_sess->esi_key_phase << 2; 1768 1769 if (s_log_seal_and_open) 1770 { 1771 LSQ_DEBUG("seal: nonce (%u bytes): %s", crypto_ctx->yk_iv_sz, 1772 HEXSTR(nonce, crypto_ctx->yk_iv_sz, s_str)); 1773 LSQ_DEBUG("seal: ad (%u bytes): %s", header_sz, 1774 HEXSTR(dst, header_sz, s_str)); 1775 LSQ_DEBUG("seal: in (%u bytes): %s", packet_out->po_data_sz, 1776 HEXSTR(packet_out->po_data, packet_out->po_data_sz, s_str)); 1777 } 1778 if (!EVP_AEAD_CTX_seal(&crypto_ctx->yk_aead_ctx, dst + header_sz, &out_sz, 1779 dst_sz - header_sz, nonce, crypto_ctx->yk_iv_sz, packet_out->po_data, 1780 packet_out->po_data_sz, dst, header_sz)) 1781 { 1782 LSQ_WARN("cannot seal packet #%"PRIu64": %s", packet_out->po_packno, 1783 ERR_error_string(ERR_get_error(), errbuf)); 1784 goto err; 1785 } 1786 assert(out_sz == dst_sz - header_sz); 1787 1788 lconn->cn_pf->pf_packno_info(lconn, packet_out, &packno_off, &packno_len); 1789#ifndef NDEBUG 1790 const unsigned sample_off = packno_off + 4; 1791 assert(sample_off + IQUIC_TAG_LEN <= dst_sz); 1792#endif 1793 apply_hp(enc_sess, hp, cliser, dst, packno_off, packno_len); 1794 1795 packet_out->po_enc_data = dst; 1796 packet_out->po_enc_data_sz = dst_sz; 1797 packet_out->po_sent_sz = dst_sz; 1798 packet_out->po_flags &= ~PO_IPv6; 1799 packet_out->po_flags |= PO_ENCRYPTED|PO_SENT_SZ|(ipv6 << POIPv6_SHIFT); 1800 lsquic_packet_out_set_enc_level(packet_out, enc_level); 1801 lsquic_packet_out_set_kp(packet_out, enc_sess->esi_key_phase); 1802 return ENCPA_OK; 1803 1804 err: 1805 enpub->enp_pmi->pmi_return(enpub->enp_pmi_ctx, 1806 packet_out->po_path->np_peer_ctx, dst, ipv6); 1807 return ENCPA_BADCRYPT; 1808} 1809 1810 1811static struct ku_label 1812{ 1813 const char *str; 1814 uint8_t len; 1815} 1816 1817 1818select_ku_label (const struct enc_sess_iquic *enc_sess) 1819{ 1820 if (enc_sess->esi_conn->cn_version == LSQVER_ID23) 1821 return (struct ku_label) { "traffic upd", 11, }; 1822 else 1823 return (struct ku_label) { "quic ku", 7, }; 1824} 1825 1826 1827static enum dec_packin 1828iquic_esf_decrypt_packet (enc_session_t *enc_session_p, 1829 struct lsquic_engine_public *enpub, const struct lsquic_conn *lconn, 1830 struct lsquic_packet_in *packet_in) 1831{ 1832 struct enc_sess_iquic *const enc_sess = enc_session_p; 1833 unsigned char *dst; 1834 struct crypto_ctx_pair *pair; 1835 const struct header_prot *hp; 1836 struct crypto_ctx *crypto_ctx = NULL; 1837 unsigned char nonce_buf[ sizeof(crypto_ctx->yk_iv_buf) + 8 ]; 1838 unsigned char *nonce, *begin_xor; 1839 unsigned sample_off, packno_len, cliser, key_phase; 1840 enum enc_level enc_level; 1841 enum packnum_space pns; 1842 lsquic_packno_t packno; 1843 size_t out_sz; 1844 enum dec_packin dec_packin; 1845 int s; 1846 const size_t dst_sz = packet_in->pi_data_sz; 1847 unsigned char new_secret[EVP_MAX_KEY_LENGTH]; 1848 struct crypto_ctx crypto_ctx_buf; 1849 char secret_str[EVP_MAX_KEY_LENGTH * 2 + 1]; 1850 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1851 1852 dst = lsquic_mm_get_packet_in_buf(&enpub->enp_mm, dst_sz); 1853 if (!dst) 1854 { 1855 LSQ_WARN("cannot allocate memory to copy incoming packet data"); 1856 dec_packin = DECPI_NOMEM; 1857 goto err; 1858 } 1859 1860 enc_level = hety2el[packet_in->pi_header_type]; 1861 if (enc_level == ENC_LEV_FORW) 1862 hp = &enc_sess->esi_hp; 1863 else if (enc_sess->esi_hsk_pairs) 1864 hp = &enc_sess->esi_hsk_hps[ enc_level ]; 1865 else 1866 hp = NULL; 1867 1868 if (UNLIKELY(!(hp && header_prot_inited(hp)))) 1869 { 1870 LSQ_DEBUG("header protection for level %u not initialized yet", 1871 enc_level); 1872 dec_packin = DECPI_NOT_YET; 1873 goto err; 1874 } 1875 1876 /* Decrypt packet number. After this operation, packet_in is adjusted: 1877 * the packet number becomes part of the header. 1878 */ 1879 sample_off = packet_in->pi_header_sz + 4; 1880 if (sample_off + IQUIC_TAG_LEN > packet_in->pi_data_sz) 1881 { 1882 LSQ_INFO("packet data is too short: %hu bytes", 1883 packet_in->pi_data_sz); 1884 dec_packin = DECPI_TOO_SHORT; 1885 goto err; 1886 } 1887 cliser = !(enc_sess->esi_flags & ESI_SERVER); 1888 memcpy(dst, packet_in->pi_data, sample_off); 1889 packet_in->pi_packno = 1890 packno = strip_hp(enc_sess, hp, cliser, 1891 packet_in->pi_data + sample_off, 1892 dst, packet_in->pi_header_sz, &packno_len); 1893 1894 if (enc_level == ENC_LEV_FORW) 1895 { 1896 key_phase = (dst[0] & 0x04) > 0; 1897 pair = &enc_sess->esi_pairs[ key_phase ]; 1898 if (key_phase == enc_sess->esi_key_phase) 1899 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1900 else if (!is_valid_packno( 1901 enc_sess->esi_pairs[enc_sess->esi_key_phase].ykp_thresh) 1902 || packet_in->pi_packno 1903 > enc_sess->esi_pairs[enc_sess->esi_key_phase].ykp_thresh) 1904 { 1905 const struct ku_label kl = select_ku_label(enc_sess); 1906 lsquic_qhkdf_expand(enc_sess->esi_md, 1907 enc_sess->esi_traffic_secrets[cliser], enc_sess->esi_trasec_sz, 1908 kl.str, kl.len, new_secret, enc_sess->esi_trasec_sz); 1909 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 1910 LSQ_DEBUG("key phase changed to %u, will try decrypting using " 1911 "new secret %s", key_phase, HEXSTR(new_secret, 1912 enc_sess->esi_trasec_sz, secret_str)); 1913 else 1914 LSQ_DEBUG("key phase changed to %u, will try decrypting using " 1915 "new secret", key_phase); 1916 crypto_ctx = &crypto_ctx_buf; 1917 crypto_ctx->yk_flags = 0; 1918 s = init_crypto_ctx(crypto_ctx, enc_sess->esi_md, 1919 enc_sess->esi_aead, new_secret, enc_sess->esi_trasec_sz, 1920 evp_aead_open); 1921 if (s != 0) 1922 { 1923 LSQ_ERROR("could not init open crypto ctx (key phase)"); 1924 dec_packin = DECPI_BADCRYPT; 1925 goto err; 1926 } 1927 } 1928 else 1929 { 1930 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1931 if (UNLIKELY(0 == (crypto_ctx->yk_flags & YK_INITED))) 1932 { 1933 LSQ_DEBUG("supposedly older context is not initialized (key " 1934 "phase: %u)", key_phase); 1935 dec_packin = DECPI_BADCRYPT; 1936 goto err; 1937 } 1938 } 1939 } 1940 else 1941 { 1942 key_phase = 0; 1943 assert(enc_sess->esi_hsk_pairs); 1944 pair = &enc_sess->esi_hsk_pairs[ enc_level ]; 1945 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1946 if (UNLIKELY(0 == (crypto_ctx->yk_flags & YK_INITED))) 1947 { 1948 LSQ_WARN("decrypt crypto context at level %s not initialized", 1949 lsquic_enclev2str[enc_level]); 1950 dec_packin = DECPI_BADCRYPT; 1951 goto err; 1952 } 1953 } 1954 1955 if (s_log_seal_and_open) 1956 LSQ_DEBUG("open: iv: %s; packno: 0x%"PRIX64, 1957 HEXSTR(crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz, s_str), packno); 1958 /* Align nonce so we can perform XOR safely in one shot: */ 1959 begin_xor = nonce_buf + sizeof(nonce_buf) - 8; 1960 begin_xor = (unsigned char *) ((uintptr_t) begin_xor & ~0x7); 1961 nonce = begin_xor - crypto_ctx->yk_iv_sz + 8; 1962 memcpy(nonce, crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz); 1963#if __BYTE_ORDER == __LITTLE_ENDIAN 1964 packno = bswap_64(packno); 1965#endif 1966 *((uint64_t *) begin_xor) ^= packno; 1967 1968 packet_in->pi_header_sz += packno_len; 1969 1970 if (s_log_seal_and_open) 1971 { 1972 LSQ_DEBUG("open: nonce (%u bytes): %s", crypto_ctx->yk_iv_sz, 1973 HEXSTR(nonce, crypto_ctx->yk_iv_sz, s_str)); 1974 LSQ_DEBUG("open: ad (%u bytes): %s", packet_in->pi_header_sz, 1975 HEXSTR(dst, packet_in->pi_header_sz, s_str)); 1976 LSQ_DEBUG("open: in (%u bytes): %s", packet_in->pi_data_sz 1977 - packet_in->pi_header_sz, HEXSTR(packet_in->pi_data 1978 + packet_in->pi_header_sz, packet_in->pi_data_sz 1979 - packet_in->pi_header_sz, s_str)); 1980 } 1981 if (!EVP_AEAD_CTX_open(&crypto_ctx->yk_aead_ctx, 1982 dst + packet_in->pi_header_sz, &out_sz, 1983 dst_sz - packet_in->pi_header_sz, nonce, crypto_ctx->yk_iv_sz, 1984 packet_in->pi_data + packet_in->pi_header_sz, 1985 packet_in->pi_data_sz - packet_in->pi_header_sz, 1986 dst, packet_in->pi_header_sz)) 1987 { 1988 LSQ_INFO("cannot open packet #%"PRIu64": %s", packet_in->pi_packno, 1989 ERR_error_string(ERR_get_error(), errbuf)); 1990 dec_packin = DECPI_BADCRYPT; 1991 goto err; 1992 } 1993 1994 if (enc_sess->esi_flags & ESI_QL_BITS) 1995 { 1996 packet_in->pi_flags |= PI_LOG_QL_BITS; 1997 if (dst[0] & 0x10) 1998 packet_in->pi_flags |= PI_SQUARE_BIT; 1999 if (dst[0] & 0x08) 2000 packet_in->pi_flags |= PI_LOSS_BIT; 2001 } 2002 else if (dst[0] & (0x0C << (packet_in->pi_header_type == HETY_NOT_SET))) 2003 { 2004 LSQ_DEBUG("reserved bits are not set to zero"); 2005 dec_packin = DECPI_VIOLATION; 2006 goto err; 2007 } 2008 2009 if (crypto_ctx == &crypto_ctx_buf) 2010 { 2011 LSQ_DEBUG("decryption in the new key phase %u successful, rotate " 2012 "keys", key_phase); 2013 const struct ku_label kl = select_ku_label(enc_sess); 2014 pair->ykp_thresh = packet_in->pi_packno; 2015 pair->ykp_ctx[ cliser ] = crypto_ctx_buf; 2016 memcpy(enc_sess->esi_traffic_secrets[ cliser ], new_secret, 2017 enc_sess->esi_trasec_sz); 2018 lsquic_qhkdf_expand(enc_sess->esi_md, 2019 enc_sess->esi_traffic_secrets[!cliser], enc_sess->esi_trasec_sz, 2020 kl.str, kl.len, new_secret, enc_sess->esi_trasec_sz); 2021 memcpy(enc_sess->esi_traffic_secrets[ !cliser ], new_secret, 2022 enc_sess->esi_trasec_sz); 2023 s = init_crypto_ctx(&pair->ykp_ctx[ !cliser ], enc_sess->esi_md, 2024 enc_sess->esi_aead, new_secret, enc_sess->esi_trasec_sz, 2025 evp_aead_seal); 2026 if (s != 0) 2027 { 2028 LSQ_ERROR("could not init seal crypto ctx (key phase)"); 2029 cleanup_crypto_ctx(&pair->ykp_ctx[ !cliser ]); 2030 /* XXX Is this the proper thing to do? Packet decrypted fine... */ 2031 dec_packin = DECPI_BADCRYPT; 2032 goto err; 2033 } 2034 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 2035 log_crypto_pair(enc_sess, pair, "updated"); 2036 enc_sess->esi_key_phase = key_phase; 2037 } 2038 2039 packet_in->pi_data_sz = packet_in->pi_header_sz + out_sz; 2040 if (packet_in->pi_flags & PI_OWN_DATA) 2041 lsquic_mm_put_packet_in_buf(&enpub->enp_mm, packet_in->pi_data, 2042 packet_in->pi_data_sz); 2043 packet_in->pi_data = dst; 2044 packet_in->pi_flags |= PI_OWN_DATA | PI_DECRYPTED 2045 | (enc_level << PIBIT_ENC_LEV_SHIFT); 2046 EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "decrypted packet %"PRIu64, 2047 packet_in->pi_packno); 2048 pns = lsquic_enclev2pns[enc_level]; 2049 if (packet_in->pi_packno > enc_sess->esi_max_packno[pns]) 2050 enc_sess->esi_max_packno[pns] = packet_in->pi_packno; 2051 if (is_valid_packno(pair->ykp_thresh) 2052 && packet_in->pi_packno > pair->ykp_thresh) 2053 pair->ykp_thresh = packet_in->pi_packno; 2054 return DECPI_OK; 2055 2056 err: 2057 if (crypto_ctx == &crypto_ctx_buf) 2058 cleanup_crypto_ctx(crypto_ctx); 2059 if (dst) 2060 lsquic_mm_put_packet_in_buf(&enpub->enp_mm, dst, dst_sz); 2061 EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "could not decrypt packet (type %s, " 2062 "number %"PRIu64")", lsquic_hety2str[packet_in->pi_header_type], 2063 packet_in->pi_packno); 2064 return dec_packin; 2065} 2066 2067 2068static int 2069iquic_esf_global_init (int flags) 2070{ 2071 s_idx = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL); 2072 if (s_idx >= 0) 2073 { 2074 LSQ_LOG1(LSQ_LOG_DEBUG, "SSL extra data index: %d", s_idx); 2075 return 0; 2076 } 2077 else 2078 { 2079 LSQ_LOG1(LSQ_LOG_ERROR, "%s: could not select index", __func__); 2080 return -1; 2081 } 2082} 2083 2084 2085static void 2086iquic_esf_global_cleanup (void) 2087{ 2088} 2089 2090 2091static void * 2092copy_X509 (void *cert) 2093{ 2094 X509_up_ref(cert); 2095 return cert; 2096} 2097 2098 2099static struct stack_st_X509 * 2100iquic_esf_get_server_cert_chain (enc_session_t *enc_session_p) 2101{ 2102 struct enc_sess_iquic *const enc_sess = enc_session_p; 2103 STACK_OF(X509) *chain; 2104 2105 if (enc_sess->esi_ssl) 2106 { 2107 chain = SSL_get_peer_cert_chain(enc_sess->esi_ssl); 2108 return (struct stack_st_X509 *) 2109 sk_deep_copy((const _STACK *) chain, sk_X509_call_copy_func, 2110 copy_X509, sk_X509_call_free_func, (void(*)(void*))X509_free); 2111 } 2112 else 2113 return NULL; 2114} 2115 2116 2117static const char * 2118iquic_esf_cipher (enc_session_t *enc_session_p) 2119{ 2120 struct enc_sess_iquic *const enc_sess = enc_session_p; 2121 const SSL_CIPHER *cipher; 2122 2123 if (enc_sess->esi_flags & ESI_CACHED_INFO) 2124 return enc_sess->esi_cached_info.cipher_name; 2125 else if (enc_sess->esi_ssl) 2126 { 2127 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 2128 return SSL_CIPHER_get_name(cipher); 2129 } 2130 else 2131 { 2132 LSQ_WARN("SSL session is not set"); 2133 return "null"; 2134 } 2135} 2136 2137 2138static int 2139iquic_esf_keysize (enc_session_t *enc_session_p) 2140{ 2141 struct enc_sess_iquic *const enc_sess = enc_session_p; 2142 const SSL_CIPHER *cipher; 2143 uint32_t id; 2144 2145 if (enc_sess->esi_flags & ESI_CACHED_INFO) 2146 return enc_sess->esi_cached_info.alg_bits / 8; 2147 else if (enc_sess->esi_ssl) 2148 { 2149 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 2150 id = SSL_CIPHER_get_id(cipher); 2151 2152 /* RFC 8446, Appendix B.4 */ 2153 switch (id) 2154 { 2155 case 0x03000000 | 0x1301: /* TLS_AES_128_GCM_SHA256 */ 2156 return 128 / 8; 2157 case 0x03000000 | 0x1302: /* TLS_AES_256_GCM_SHA384 */ 2158 return 256 / 8; 2159 case 0x03000000 | 0x1303: /* TLS_CHACHA20_POLY1305_SHA256 */ 2160 return 256 / 8; 2161 default: 2162 return -1; 2163 } 2164 } 2165 else 2166 { 2167 LSQ_WARN("SSL session is not set"); 2168 return -1; 2169 } 2170} 2171 2172 2173static int 2174iquic_esf_alg_keysize (enc_session_t *enc_session_p) 2175{ 2176 /* Modeled on SslConnection::getEnv() */ 2177 return iquic_esf_keysize(enc_session_p); 2178} 2179 2180 2181static int 2182iquic_esf_zero_rtt_enabled (enc_session_t *enc_session_p) 2183{ 2184 struct enc_sess_iquic *const enc_sess = enc_session_p; 2185 return enc_sess->esi_zero_rtt_buf != NULL; 2186} 2187 2188 2189int 2190iquic_esfi_reset_dcid (enc_session_t *enc_session_p, 2191 const lsquic_cid_t *old_dcid, const lsquic_cid_t *new_dcid) 2192{ 2193 struct enc_sess_iquic *const enc_sess = enc_session_p; 2194 2195 enc_sess->esi_odcid = *old_dcid; 2196 enc_sess->esi_flags |= ESI_ODCID; 2197 /* TODO: free previous handshake keys */ 2198 if (0 == setup_handshake_keys(enc_sess, new_dcid)) 2199 { 2200 LSQ_INFOC("reset DCID to %"CID_FMT, CID_BITS(new_dcid)); 2201 return 0; 2202 } 2203 else 2204 return -1; 2205} 2206 2207 2208static void 2209iquic_esfi_1rtt_acked (enc_session_t *sess) 2210{ 2211 struct enc_sess_iquic *enc_sess = (struct enc_sess_iquic *) sess; 2212 2213 if (!(enc_sess->esi_flags & ESI_1RTT_ACKED)) 2214 { 2215 LSQ_DEBUG("1RTT packet has been acked"); 2216 enc_sess->esi_flags |= ESI_1RTT_ACKED; 2217 maybe_drop_SSL(enc_sess); 2218 } 2219} 2220 2221 2222static void iquic_esfi_shake_stream (enc_session_t *sess, 2223 struct lsquic_stream *stream, const char *what); 2224 2225 2226const struct enc_session_funcs_iquic lsquic_enc_session_iquic_ietf_v1 = 2227{ 2228 .esfi_create_client = iquic_esfi_create_client, 2229 .esfi_destroy = iquic_esfi_destroy, 2230 .esfi_get_peer_transport_params 2231 = iquic_esfi_get_peer_transport_params, 2232 .esfi_reset_dcid = iquic_esfi_reset_dcid, 2233 .esfi_init_server = iquic_esfi_init_server, 2234 .esfi_set_streams = iquic_esfi_set_streams, 2235 .esfi_create_server = iquic_esfi_create_server, 2236 .esfi_shake_stream = iquic_esfi_shake_stream, 2237 .esfi_1rtt_acked = iquic_esfi_1rtt_acked, 2238}; 2239 2240 2241const struct enc_session_funcs_common lsquic_enc_session_common_ietf_v1 = 2242{ 2243 .esf_encrypt_packet = iquic_esf_encrypt_packet, 2244 .esf_decrypt_packet = iquic_esf_decrypt_packet, 2245 .esf_global_cleanup = iquic_esf_global_cleanup, 2246 .esf_global_init = iquic_esf_global_init, 2247 .esf_tag_len = IQUIC_TAG_LEN, 2248 .esf_get_server_cert_chain 2249 = iquic_esf_get_server_cert_chain, 2250 .esf_cipher = iquic_esf_cipher, 2251 .esf_keysize = iquic_esf_keysize, 2252 .esf_alg_keysize = iquic_esf_alg_keysize, 2253 .esf_is_zero_rtt_enabled = iquic_esf_zero_rtt_enabled, 2254 .esf_set_conn = iquic_esf_set_conn, 2255}; 2256 2257 2258static void 2259cache_info (struct enc_sess_iquic *enc_sess) 2260{ 2261 const SSL_CIPHER *cipher; 2262 2263 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 2264 enc_sess->esi_cached_info.cipher_name = SSL_CIPHER_get_name(cipher); 2265 SSL_CIPHER_get_bits(cipher, &enc_sess->esi_cached_info.alg_bits); 2266 enc_sess->esi_flags |= ESI_CACHED_INFO; 2267} 2268 2269 2270static void 2271drop_SSL (struct enc_sess_iquic *enc_sess) 2272{ 2273 LSQ_DEBUG("drop SSL object"); 2274 if (enc_sess->esi_conn->cn_if->ci_drop_crypto_streams) 2275 enc_sess->esi_conn->cn_if->ci_drop_crypto_streams( 2276 enc_sess->esi_conn); 2277 cache_info(enc_sess); 2278 SSL_free(enc_sess->esi_ssl); 2279 enc_sess->esi_ssl = NULL; 2280 free_handshake_keys(enc_sess); 2281} 2282 2283 2284static void 2285maybe_drop_SSL (struct enc_sess_iquic *enc_sess) 2286{ 2287 /* We rely on the following BoringSSL property: it writes new session 2288 * tickets before marking handshake as complete. In this case, the new 2289 * session tickets have either been successfully written to crypto stream, 2290 * in which case we can close it, or (unlikely) they are buffered in the 2291 * frab list. 2292 */ 2293 if ((enc_sess->esi_flags & (ESI_1RTT_ACKED|ESI_HANDSHAKE_OK)) 2294 == (ESI_1RTT_ACKED|ESI_HANDSHAKE_OK) 2295 && enc_sess->esi_ssl 2296 && lsquic_frab_list_empty(&enc_sess->esi_frals[ENC_LEV_FORW])) 2297 { 2298 if ((enc_sess->esi_flags & (ESI_SERVER|ESI_WANT_TICKET)) 2299 != ESI_WANT_TICKET) 2300 drop_SSL(enc_sess); 2301 else if (enc_sess->esi_alset 2302 && !lsquic_alarmset_is_set(enc_sess->esi_alset, AL_SESS_TICKET)) 2303 { 2304 LSQ_DEBUG("no session ticket: delay dropping SSL object"); 2305 lsquic_alarmset_set(enc_sess->esi_alset, AL_SESS_TICKET, 2306 /* Wait up to two seconds for session tickets */ 2307 lsquic_time_now() + 2000000); 2308 } 2309 } 2310} 2311 2312 2313static void 2314no_sess_ticket (enum alarm_id alarm_id, void *ctx, 2315 lsquic_time_t expiry, lsquic_time_t now) 2316{ 2317 struct enc_sess_iquic *enc_sess = ctx; 2318 2319 LSQ_DEBUG("no session tickets forthcoming -- drop SSL"); 2320 drop_SSL(enc_sess); 2321} 2322 2323 2324typedef char enums_have_the_same_value[ 2325 (int) ssl_encryption_initial == (int) ENC_LEV_CLEAR && 2326 (int) ssl_encryption_early_data == (int) ENC_LEV_EARLY && 2327 (int) ssl_encryption_handshake == (int) ENC_LEV_INIT && 2328 (int) ssl_encryption_application == (int) ENC_LEV_FORW ? 1 : -1]; 2329 2330static int 2331cry_sm_set_encryption_secret (SSL *ssl, enum ssl_encryption_level_t level, 2332 const uint8_t *read_secret, const uint8_t *write_secret, 2333 size_t secret_len) 2334{ 2335 struct enc_sess_iquic *enc_sess; 2336 struct crypto_ctx_pair *pair; 2337 struct header_prot *hp; 2338 struct crypto_params crypa; 2339 int i; 2340 int have_alpn; 2341 const unsigned char *alpn; 2342 unsigned alpn_len; 2343 const enum enc_level enc_level = (enum enc_level) level; 2344 const uint8_t *secrets[2]; 2345 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 2346#define hexbuf errbuf 2347 2348 enc_sess = SSL_get_ex_data(ssl, s_idx); 2349 if (!enc_sess) 2350 return 0; 2351 2352 if ((enc_sess->esi_flags & (ESI_ALPN_CHECKED|ESI_SERVER)) == ESI_SERVER) 2353 { 2354 enc_sess->esi_flags |= ESI_ALPN_CHECKED; 2355 SSL_get0_alpn_selected(enc_sess->esi_ssl, &alpn, &alpn_len); 2356 have_alpn = alpn && alpn_len == enc_sess->esi_alpn[0] 2357 && 0 == memcmp(alpn, enc_sess->esi_alpn + 1, alpn_len); 2358 if (have_alpn) 2359 LSQ_DEBUG("Selected ALPN %.*s", (int) alpn_len, (char *) alpn); 2360 else 2361 { 2362 LSQ_INFO("No ALPN is selected: send fatal alert"); 2363 SSL_send_fatal_alert(ssl, ALERT_NO_APPLICATION_PROTOCOL); 2364 return 0; 2365 } 2366 } 2367 2368 if (0 != get_crypto_params(enc_sess, &crypa)) 2369 return 0; 2370 2371 if (enc_sess->esi_flags & ESI_SERVER) 2372 secrets[0] = read_secret, secrets[1] = write_secret; 2373 else 2374 secrets[0] = write_secret, secrets[1] = read_secret; 2375 2376 if (enc_level < ENC_LEV_FORW) 2377 { 2378 assert(enc_sess->esi_hsk_pairs); 2379 pair = &enc_sess->esi_hsk_pairs[enc_level]; 2380 hp = &enc_sess->esi_hsk_hps[enc_level]; 2381 } 2382 else 2383 { 2384 pair = &enc_sess->esi_pairs[0]; 2385 hp = &enc_sess->esi_hp; 2386 enc_sess->esi_trasec_sz = secret_len; 2387 memcpy(enc_sess->esi_traffic_secrets[0], secrets[0], secret_len); 2388 memcpy(enc_sess->esi_traffic_secrets[1], secrets[1], secret_len); 2389 enc_sess->esi_md = crypa.md; 2390 enc_sess->esi_aead = crypa.aead; 2391 } 2392 pair->ykp_thresh = IQUIC_INVALID_PACKNO; 2393 2394 LSQ_DEBUG("set encryption for level %u", enc_level); 2395 for (i = 1; i >= 0; --i) 2396 { 2397 if (secrets[i]) 2398 { 2399 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 2400 LSQ_DEBUG("new %s secret: %s", i ? "server" : "client", 2401 HEXSTR(secrets[i], secret_len, hexbuf)); 2402 if (0 != init_crypto_ctx(&pair->ykp_ctx[i], crypa.md, 2403 crypa.aead, secrets[i], secret_len, enc_sess->esi_dir[i])) 2404 goto err; 2405 } 2406 else 2407 assert(level == ssl_encryption_early_data); 2408 } 2409 2410 hp->hp_enc_level = enc_level; 2411 hp->hp_cipher = crypa.hp; 2412 hp->hp_gen_mask = crypa.gen_hp_mask; 2413 derive_hp_secrets(hp, crypa.md, crypa.aead, secret_len, secrets[0], 2414 secrets[1]); 2415 2416 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 2417 { 2418 log_crypto_pair(enc_sess, pair, "new"); 2419 log_hp(enc_sess, hp, "new"); 2420 } 2421 2422 return 1; 2423 2424 err: 2425 cleanup_crypto_ctx(&pair->ykp_ctx[0]); 2426 cleanup_crypto_ctx(&pair->ykp_ctx[1]); 2427 return 0; 2428#undef hexbuf 2429} 2430 2431 2432static int 2433cry_sm_write_message (SSL *ssl, enum ssl_encryption_level_t level, 2434 const uint8_t *data, size_t len) 2435{ 2436 struct enc_sess_iquic *enc_sess; 2437 void *stream; 2438 ssize_t nw; 2439 2440 enc_sess = SSL_get_ex_data(ssl, s_idx); 2441 if (!enc_sess) 2442 return 0; 2443 2444 stream = enc_sess->esi_streams[level]; 2445 if (!stream) 2446 return 0; 2447 2448 /* The frab list logic is only applicable on the client. XXX This is 2449 * likely to change when support for key updates is added. 2450 */ 2451 if (enc_sess->esi_flags & (ESI_ON_WRITE|ESI_SERVER)) 2452 nw = enc_sess->esi_cryst_if->csi_write(stream, data, len); 2453 else 2454 { 2455 LSQ_DEBUG("not in on_write event: buffer in a frab list"); 2456 if (0 == lsquic_frab_list_write(&enc_sess->esi_frals[level], data, len)) 2457 { 2458 if (!lsquic_frab_list_empty(&enc_sess->esi_frals[level])) 2459 enc_sess->esi_cryst_if->csi_wantwrite(stream, 1); 2460 nw = len; 2461 } 2462 else 2463 nw = -1; 2464 } 2465 2466 if (nw >= 0 && (size_t) nw == len) 2467 { 2468 enc_sess->esi_last_w = (enum enc_level) level; 2469 LSQ_DEBUG("wrote %zu bytes to stream at encryption level %u", 2470 len, level); 2471 maybe_drop_SSL(enc_sess); 2472 return 1; 2473 } 2474 else 2475 { 2476 LSQ_INFO("could not write %zu bytes: returned %zd", len, nw); 2477 return 0; 2478 } 2479} 2480 2481 2482static int 2483cry_sm_flush_flight (SSL *ssl) 2484{ 2485 struct enc_sess_iquic *enc_sess; 2486 void *stream; 2487 unsigned level; 2488 int s; 2489 2490 enc_sess = SSL_get_ex_data(ssl, s_idx); 2491 if (!enc_sess) 2492 return 0; 2493 2494 level = enc_sess->esi_last_w; 2495 stream = enc_sess->esi_streams[level]; 2496 if (!stream) 2497 return 0; 2498 2499 if (lsquic_frab_list_empty(&enc_sess->esi_frals[level])) 2500 { 2501 s = enc_sess->esi_cryst_if->csi_flush(stream); 2502 return s == 0; 2503 } 2504 else 2505 /* Frab list will get flushed */ /* TODO: add support for 2506 recording flush points in frab list. */ 2507 return 1; 2508} 2509 2510 2511static int 2512cry_sm_send_alert (SSL *ssl, enum ssl_encryption_level_t level, uint8_t alert) 2513{ 2514 struct enc_sess_iquic *enc_sess; 2515 2516 enc_sess = SSL_get_ex_data(ssl, s_idx); 2517 if (!enc_sess) 2518 return 0; 2519 2520 LSQ_INFO("got alert %"PRIu8, alert); 2521 enc_sess->esi_conn->cn_if->ci_tls_alert(enc_sess->esi_conn, alert); 2522 2523 return 1; 2524} 2525 2526 2527static const SSL_QUIC_METHOD cry_quic_method = 2528{ 2529 .set_encryption_secrets = cry_sm_set_encryption_secret, 2530 .add_handshake_data = cry_sm_write_message, 2531 .flush_flight = cry_sm_flush_flight, 2532 .send_alert = cry_sm_send_alert, 2533}; 2534 2535 2536static lsquic_stream_ctx_t * 2537chsk_ietf_on_new_stream (void *stream_if_ctx, struct lsquic_stream *stream) 2538{ 2539 struct enc_sess_iquic *const enc_sess = stream_if_ctx; 2540 enum enc_level enc_level; 2541 2542 enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2543 if (enc_level != ENC_LEV_CLEAR) 2544 { 2545 LSQ_DEBUG("skip initialization of stream at level %u", enc_level); 2546 goto end; 2547 } 2548 2549 if ( 2550 (enc_sess->esi_flags & ESI_SERVER) == 0 && 2551 0 != init_client(enc_sess)) 2552 { 2553 LSQ_WARN("enc session could not be initialized"); 2554 return NULL; 2555 } 2556 2557 enc_sess->esi_cryst_if->csi_wantwrite(stream, 1); 2558 2559 LSQ_DEBUG("handshake stream created successfully"); 2560 2561 end: 2562 return stream_if_ctx; 2563} 2564 2565 2566static lsquic_stream_ctx_t * 2567shsk_ietf_on_new_stream (void *stream_if_ctx, struct lsquic_stream *stream) 2568{ 2569 struct enc_sess_iquic *const enc_sess = stream_if_ctx; 2570 enum enc_level enc_level; 2571 2572 enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2573 LSQ_DEBUG("on_new_stream called on level %u", enc_level); 2574 2575 enc_sess->esi_cryst_if->csi_wantread(stream, 1); 2576 2577 return stream_if_ctx; 2578} 2579 2580 2581static void 2582chsk_ietf_on_close (struct lsquic_stream *stream, lsquic_stream_ctx_t *ctx) 2583{ 2584 struct enc_sess_iquic *const enc_sess = (struct enc_sess_iquic *) ctx; 2585 LSQ_DEBUG("crypto stream level %u is closed", 2586 (unsigned) enc_sess->esi_cryst_if->csi_enc_level(stream)); 2587} 2588 2589 2590static const char *const ihs2str[] = { 2591 [IHS_WANT_READ] = "want read", 2592 [IHS_WANT_WRITE] = "want write", 2593 [IHS_STOP] = "stop", 2594}; 2595 2596 2597static void 2598iquic_esfi_shake_stream (enc_session_t *sess, 2599 struct lsquic_stream *stream, const char *what) 2600{ 2601 struct enc_sess_iquic *enc_sess = (struct enc_sess_iquic *)sess; 2602 enum iquic_handshake_status st; 2603 enum enc_level enc_level; 2604 int write; 2605 if (0 == (enc_sess->esi_flags & ESI_HANDSHAKE_OK)) 2606 st = iquic_esfi_handshake(enc_sess); 2607 else 2608 st = iquic_esfi_post_handshake(enc_sess); 2609 enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2610 LSQ_DEBUG("enc level %s after %s: %s", lsquic_enclev2str[enc_level], what, 2611 ihs2str[st]); 2612 switch (st) 2613 { 2614 case IHS_WANT_READ: 2615 write = !lsquic_frab_list_empty(&enc_sess->esi_frals[enc_level]); 2616 enc_sess->esi_cryst_if->csi_wantwrite(stream, write); 2617 enc_sess->esi_cryst_if->csi_wantread(stream, 1); 2618 break; 2619 case IHS_WANT_WRITE: 2620 enc_sess->esi_cryst_if->csi_wantwrite(stream, 1); 2621 enc_sess->esi_cryst_if->csi_wantread(stream, 0); 2622 break; 2623 default: 2624 assert(st == IHS_STOP); 2625 write = !lsquic_frab_list_empty(&enc_sess->esi_frals[enc_level]); 2626 enc_sess->esi_cryst_if->csi_wantwrite(stream, write); 2627 enc_sess->esi_cryst_if->csi_wantread(stream, 0); 2628 break; 2629 } 2630 LSQ_DEBUG("Exit shake_stream"); 2631 maybe_drop_SSL(enc_sess); 2632} 2633 2634 2635struct readf_ctx 2636{ 2637 struct enc_sess_iquic *enc_sess; 2638 enum enc_level enc_level; 2639 int err; 2640}; 2641 2642 2643static size_t 2644readf_cb (void *ctx, const unsigned char *buf, size_t len, int fin) 2645{ 2646 struct readf_ctx *const readf_ctx = (void *) ctx; 2647 struct enc_sess_iquic *const enc_sess = readf_ctx->enc_sess; 2648 int s; 2649 size_t str_sz; 2650 char str[MAX(1500 * 5, ERR_ERROR_STRING_BUF_LEN)]; 2651 2652 s = SSL_provide_quic_data(enc_sess->esi_ssl, 2653 (enum ssl_encryption_level_t) readf_ctx->enc_level, buf, len); 2654 if (s) 2655 { 2656 LSQ_DEBUG("provided %zu bytes of %u-level data to SSL", len, 2657 readf_ctx->enc_level); 2658 str_sz = lsquic_hexdump(buf, len, str, sizeof(str)); 2659 LSQ_DEBUG("\n%.*s", (int) str_sz, str); 2660 return len; 2661 } 2662 else 2663 { 2664 LSQ_WARN("SSL_provide_quic_data returned false: %s", 2665 ERR_error_string(ERR_get_error(), str)); 2666 readf_ctx->err++; 2667 return 0; 2668 } 2669} 2670 2671 2672static size_t 2673discard_cb (void *ctx, const unsigned char *buf, size_t len, int fin) 2674{ 2675 return len; 2676} 2677 2678 2679static void 2680chsk_ietf_on_read (struct lsquic_stream *stream, lsquic_stream_ctx_t *ctx) 2681{ 2682 struct enc_sess_iquic *const enc_sess = (void *) ctx; 2683 enum enc_level enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2684 struct readf_ctx readf_ctx = { enc_sess, enc_level, 0, }; 2685 ssize_t nread; 2686 2687 2688 if (enc_sess->esi_ssl) 2689 { 2690 nread = enc_sess->esi_cryst_if->csi_readf(stream, readf_cb, &readf_ctx); 2691 if (!(nread < 0 || readf_ctx.err)) 2692 iquic_esfi_shake_stream((enc_session_t *)enc_sess, stream, 2693 "on_read"); 2694 else 2695 enc_sess->esi_conn->cn_if->ci_internal_error(enc_sess->esi_conn, 2696 "shaking stream failed: nread: %zd, err: %d, SSL err: %"PRIu32, 2697 nread, readf_ctx.err, ERR_get_error()); 2698 } 2699 else 2700 { 2701 /* This branch is reached when we don't want TLS ticket and drop 2702 * the SSL object before we process TLS tickets that have been 2703 * already received and waiting in the incoming stream buffer. 2704 */ 2705 nread = enc_sess->esi_cryst_if->csi_readf(stream, discard_cb, NULL); 2706 lsquic_stream_wantread(stream, 0); 2707 LSQ_DEBUG("no SSL object: discard %zd bytes of SSL data", nread); 2708 } 2709} 2710 2711 2712static void 2713maybe_write_from_fral (struct enc_sess_iquic *enc_sess, 2714 struct lsquic_stream *stream) 2715{ 2716 enum enc_level enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2717 struct frab_list *const fral = &enc_sess->esi_frals[enc_level]; 2718 struct lsquic_reader reader = { 2719 .lsqr_read = lsquic_frab_list_read, 2720 .lsqr_size = lsquic_frab_list_size, 2721 .lsqr_ctx = fral, 2722 }; 2723 ssize_t nw; 2724 2725 if (lsquic_frab_list_empty(fral)) 2726 return; 2727 2728 nw = lsquic_stream_writef(stream, &reader); 2729 if (nw >= 0) 2730 { 2731 LSQ_DEBUG("wrote %zd bytes to stream from frab list", nw); 2732 (void) lsquic_stream_flush(stream); 2733 if (lsquic_frab_list_empty(fral)) 2734 lsquic_stream_wantwrite(stream, 0); 2735 } 2736 else 2737 { 2738 /* TODO: abort connection */ 2739 LSQ_WARN("cannot write to stream: %s", strerror(errno)); 2740 lsquic_stream_wantwrite(stream, 0); 2741 } 2742} 2743 2744 2745static void 2746chsk_ietf_on_write (struct lsquic_stream *stream, lsquic_stream_ctx_t *ctx) 2747{ 2748 struct enc_sess_iquic *const enc_sess = (void *) ctx; 2749 2750 maybe_write_from_fral(enc_sess, stream); 2751 2752 enc_sess->esi_flags |= ESI_ON_WRITE; 2753 iquic_esfi_shake_stream(enc_sess, stream, "on_write"); 2754 enc_sess->esi_flags &= ~ESI_ON_WRITE; 2755} 2756 2757 2758const struct lsquic_stream_if lsquic_cry_sm_if = 2759{ 2760 .on_new_stream = chsk_ietf_on_new_stream, 2761 .on_read = chsk_ietf_on_read, 2762 .on_write = chsk_ietf_on_write, 2763 .on_close = chsk_ietf_on_close, 2764}; 2765 2766 2767const struct lsquic_stream_if lsquic_mini_cry_sm_if = 2768{ 2769 .on_new_stream = shsk_ietf_on_new_stream, 2770 .on_read = chsk_ietf_on_read, 2771 .on_write = chsk_ietf_on_write, 2772 .on_close = chsk_ietf_on_close, 2773}; 2774 2775 2776struct ssl_st * 2777lsquic_hsk_getssl (lsquic_conn_t *conn) 2778{ 2779 if (!conn || !(conn->cn_flags & LSCONN_IETF)) 2780 return NULL; 2781 return ((struct enc_sess_iquic *)conn->cn_enc_session)->esi_ssl; 2782} 2783