lsquic_enc_sess_ietf.c revision df992bce
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_ID23, (unsigned char *) "\x05h3-23", }, 83 { LSQVER_VERNEG, (unsigned char *) "\x05h3-23", }, 84}; 85 86struct enc_sess_iquic; 87struct crypto_ctx; 88struct crypto_ctx_pair; 89struct header_prot; 90 91static const int s_log_seal_and_open; 92static char s_str[0x1000]; 93 94static const SSL_QUIC_METHOD cry_quic_method; 95 96static int s_idx = -1; 97 98static int 99setup_handshake_keys (struct enc_sess_iquic *, const lsquic_cid_t *); 100 101static void 102free_handshake_keys (struct enc_sess_iquic *); 103 104static struct stack_st_X509 * 105iquic_esf_get_server_cert_chain (enc_session_t *); 106 107static void 108maybe_drop_SSL (struct enc_sess_iquic *); 109 110static void 111no_sess_ticket (enum alarm_id alarm_id, void *ctx, 112 lsquic_time_t expiry, lsquic_time_t now); 113 114 115typedef void (*gen_hp_mask_f)(struct enc_sess_iquic *, 116 const struct header_prot *, unsigned cliser, 117 const unsigned char *sample, unsigned char mask[16]); 118 119 120struct header_prot 121{ 122 const EVP_CIPHER *hp_cipher; 123 gen_hp_mask_f hp_gen_mask; 124 enum enc_level hp_enc_level; 125 unsigned hp_sz; 126 unsigned char hp_buf[2][EVP_MAX_KEY_LENGTH]; 127}; 128 129#define header_prot_inited(hp_) ((hp_)->hp_sz > 0) 130 131 132struct crypto_ctx 133{ 134 enum { 135 YK_INITED = 1 << 0, 136 } yk_flags; 137 EVP_AEAD_CTX yk_aead_ctx; 138 unsigned yk_key_sz; 139 unsigned yk_iv_sz; 140 unsigned char yk_key_buf[EVP_MAX_KEY_LENGTH]; 141 unsigned char yk_iv_buf[EVP_MAX_IV_LENGTH]; 142}; 143 144 145struct crypto_ctx_pair 146{ 147 lsquic_packno_t ykp_thresh; 148 struct crypto_ctx ykp_ctx[2]; /* client, server */ 149}; 150 151 152/* [draft-ietf-quic-tls-12] Section 5.3.6 */ 153static int 154init_crypto_ctx (struct crypto_ctx *crypto_ctx, const EVP_MD *md, 155 const EVP_AEAD *aead, const unsigned char *secret, 156 size_t secret_sz, enum evp_aead_direction_t dir) 157{ 158 crypto_ctx->yk_key_sz = EVP_AEAD_key_length(aead); 159 crypto_ctx->yk_iv_sz = EVP_AEAD_nonce_length(aead); 160 161 if (crypto_ctx->yk_key_sz > sizeof(crypto_ctx->yk_key_buf) 162 || crypto_ctx->yk_iv_sz > sizeof(crypto_ctx->yk_iv_buf)) 163 { 164 return -1; 165 } 166 167 lsquic_qhkdf_expand(md, secret, secret_sz, KEY_LABEL, KEY_LABEL_SZ, 168 crypto_ctx->yk_key_buf, crypto_ctx->yk_key_sz); 169 lsquic_qhkdf_expand(md, secret, secret_sz, IV_LABEL, IV_LABEL_SZ, 170 crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz); 171 if (!EVP_AEAD_CTX_init_with_direction(&crypto_ctx->yk_aead_ctx, aead, 172 crypto_ctx->yk_key_buf, crypto_ctx->yk_key_sz, IQUIC_TAG_LEN, dir)) 173 return -1; 174 175 crypto_ctx->yk_flags |= YK_INITED; 176 177 return 0; 178} 179 180 181static void 182derive_hp_secrets (struct header_prot *hp, const EVP_MD *md, 183 const EVP_AEAD *aead, size_t secret_sz, 184 const unsigned char *client_secret, const unsigned char *server_secret) 185{ 186 hp->hp_sz = EVP_AEAD_key_length(aead); 187 if (client_secret) 188 lsquic_qhkdf_expand(md, client_secret, secret_sz, PN_LABEL, PN_LABEL_SZ, 189 hp->hp_buf[0], hp->hp_sz); 190 if (server_secret) 191 lsquic_qhkdf_expand(md, server_secret, secret_sz, PN_LABEL, PN_LABEL_SZ, 192 hp->hp_buf[1], hp->hp_sz); 193} 194 195 196static void 197cleanup_crypto_ctx (struct crypto_ctx *crypto_ctx) 198{ 199 if (crypto_ctx->yk_flags & YK_INITED) 200 { 201 EVP_AEAD_CTX_cleanup(&crypto_ctx->yk_aead_ctx); 202 crypto_ctx->yk_flags &= ~YK_INITED; 203 } 204} 205 206 207struct enc_sess_iquic 208{ 209 struct lsquic_engine_public 210 *esi_enpub; 211 struct lsquic_conn *esi_conn; 212 void **esi_streams; 213 const struct crypto_stream_if *esi_cryst_if; 214 const struct ver_neg 215 *esi_ver_neg; 216 SSL *esi_ssl; 217 218 /* These are used for forward encryption key phase 0 and 1 */ 219 struct header_prot esi_hp; 220 struct crypto_ctx_pair 221 esi_pairs[2]; 222 /* These are used during handshake. There are three of them. 223 * esi_hsk_pairs and esi_hsk_hps are allocated and freed 224 * together. 225 */ 226 struct crypto_ctx_pair * 227 esi_hsk_pairs; 228 struct header_prot *esi_hsk_hps; 229 lsquic_packno_t esi_max_packno[N_PNS]; 230 lsquic_cid_t esi_odcid; 231 unsigned esi_key_phase; 232 enum { 233 ESI_INITIALIZED = 1 << 0, 234 ESI_LOG_SECRETS = 1 << 1, 235 ESI_HANDSHAKE_OK = 1 << 2, 236 ESI_ODCID = 1 << 3, 237 ESI_ON_WRITE = 1 << 4, 238 ESI_SERVER = 1 << 5, 239 ESI_USE_SSL_TICKET = 1 << 6, 240 ESI_HAVE_PEER_TP = 1 << 7, 241 ESI_ALPN_CHECKED = 1 << 8, 242 ESI_CACHED_INFO = 1 << 9, 243 ESI_1RTT_ACKED = 1 << 10, 244 ESI_WANT_TICKET = 1 << 11, 245 } esi_flags; 246 enum evp_aead_direction_t 247 esi_dir[2]; /* client, server */ 248 enum enc_level esi_last_w; 249 unsigned esi_trasec_sz; 250 char *esi_hostname; 251 void *esi_keylog_handle; 252#ifndef NDEBUG 253 char *esi_sni_bypass; 254#endif 255 const unsigned char *esi_alpn; 256 unsigned char *esi_zero_rtt_buf; 257 size_t esi_zero_rtt_sz; 258 /* Need MD and AEAD for key rotation */ 259 const EVP_MD *esi_md; 260 const EVP_AEAD *esi_aead; 261 struct { 262 const char *cipher_name; 263 int alg_bits; 264 } esi_cached_info; 265 /* Secrets are kept for key rotation */ 266 unsigned char esi_traffic_secrets[2][EVP_MAX_KEY_LENGTH]; 267 /* We never use the first two levels, so it seems we could reduce the 268 * memory requirement here at the cost of adding some code. 269 */ 270 struct frab_list esi_frals[N_ENC_LEVS]; 271 struct transport_params 272 esi_peer_tp; 273 struct lsquic_alarmset 274 *esi_alset; 275 unsigned esi_max_streams_uni; 276}; 277 278 279static void 280gen_hp_mask_aes (struct enc_sess_iquic *enc_sess, 281 const struct header_prot *hp, unsigned cliser, 282 const unsigned char *sample, unsigned char mask[EVP_MAX_BLOCK_LENGTH]) 283{ 284 EVP_CIPHER_CTX hp_ctx; 285 int out_len; 286 287 EVP_CIPHER_CTX_init(&hp_ctx); 288 if (EVP_EncryptInit_ex(&hp_ctx, hp->hp_cipher, NULL, hp->hp_buf[cliser], 0) 289 && EVP_EncryptUpdate(&hp_ctx, mask, &out_len, sample, 16)) 290 { 291 assert(out_len >= 5); 292 } 293 else 294 { 295 LSQ_WARN("cannot generate hp mask, error code: %"PRIu32, 296 ERR_get_error()); 297 enc_sess->esi_conn->cn_if->ci_internal_error(enc_sess->esi_conn, 298 "cannot generate hp mask, error code: %"PRIu32, ERR_get_error()); 299 } 300 301 (void) EVP_CIPHER_CTX_cleanup(&hp_ctx); 302} 303 304 305static void 306gen_hp_mask_chacha20 (struct enc_sess_iquic *enc_sess, 307 const struct header_prot *hp, unsigned cliser, 308 const unsigned char *sample, unsigned char mask[EVP_MAX_BLOCK_LENGTH]) 309{ 310 const uint8_t *nonce; 311 uint32_t counter; 312 313#if __BYTE_ORDER == __LITTLE_ENDIAN 314 memcpy(&counter, sample, sizeof(counter)); 315#else 316#error TODO: support non-little-endian machines 317#endif 318 nonce = sample + sizeof(counter); 319 CRYPTO_chacha_20(mask, (unsigned char [5]) { 0, 0, 0, 0, 0, }, 5, 320 hp->hp_buf[cliser], nonce, counter); 321} 322 323 324static void 325apply_hp (struct enc_sess_iquic *enc_sess, 326 const struct header_prot *hp, unsigned cliser, 327 unsigned char *dst, unsigned packno_off, unsigned packno_len) 328{ 329 unsigned char mask[EVP_MAX_BLOCK_LENGTH]; 330 char mask_str[5 * 2 + 1]; 331 332 hp->hp_gen_mask(enc_sess, hp, cliser, dst + packno_off + 4, mask); 333 LSQ_DEBUG("apply header protection using mask %s", 334 HEXSTR(mask, 5, mask_str)); 335 dst[0] ^= (0xF | (((dst[0] & 0x80) == 0) << 4)) & mask[0]; 336 switch (packno_len) 337 { 338 case 4: 339 dst[packno_off + 3] ^= mask[4]; 340 /* fall-through */ 341 case 3: 342 dst[packno_off + 2] ^= mask[3]; 343 /* fall-through */ 344 case 2: 345 dst[packno_off + 1] ^= mask[2]; 346 /* fall-through */ 347 default: 348 dst[packno_off + 0] ^= mask[1]; 349 } 350} 351 352 353static lsquic_packno_t 354decode_packno (lsquic_packno_t max_packno, lsquic_packno_t packno, 355 unsigned shift) 356{ 357 lsquic_packno_t candidates[3], epoch_delta; 358 int64_t diffs[3]; 359 unsigned min;; 360 361 epoch_delta = 1ULL << shift; 362 candidates[1] = (max_packno & ~(epoch_delta - 1)) + packno; 363 candidates[0] = candidates[1] - epoch_delta; 364 candidates[2] = candidates[1] + epoch_delta; 365 366 diffs[0] = llabs((int64_t) candidates[0] - (int64_t) max_packno); 367 diffs[1] = llabs((int64_t) candidates[1] - (int64_t) max_packno); 368 diffs[2] = llabs((int64_t) candidates[2] - (int64_t) max_packno); 369 370 min = diffs[1] < diffs[0]; 371 if (diffs[2] < diffs[min]) 372 min = 2; 373 374 return candidates[min]; 375} 376 377 378static lsquic_packno_t 379strip_hp (struct enc_sess_iquic *enc_sess, 380 const struct header_prot *hp, unsigned cliser, 381 const unsigned char *iv, unsigned char *dst, unsigned packno_off, 382 unsigned *packno_len) 383{ 384 enum packnum_space pns; 385 lsquic_packno_t packno; 386 unsigned shift; 387 unsigned char mask[EVP_MAX_BLOCK_LENGTH]; 388 char mask_str[5 * 2 + 1]; 389 390 hp->hp_gen_mask(enc_sess, hp, cliser, iv, mask); 391 LSQ_DEBUG("strip header protection using mask %s", 392 HEXSTR(mask, 5, mask_str)); 393 dst[0] ^= (0xF | (((dst[0] & 0x80) == 0) << 4)) & mask[0]; 394 packno = 0; 395 shift = 0; 396 *packno_len = 1 + (dst[0] & 3); 397 switch (*packno_len) 398 { 399 case 4: 400 dst[packno_off + 3] ^= mask[4]; 401 packno |= dst[packno_off + 3]; 402 shift += 8; 403 /* fall-through */ 404 case 3: 405 dst[packno_off + 2] ^= mask[3]; 406 packno |= dst[packno_off + 2] << shift; 407 shift += 8; 408 /* fall-through */ 409 case 2: 410 dst[packno_off + 1] ^= mask[2]; 411 packno |= dst[packno_off + 1] << shift; 412 shift += 8; 413 /* fall-through */ 414 default: 415 dst[packno_off + 0] ^= mask[1]; 416 packno |= dst[packno_off + 0] << shift; 417 shift += 8; 418 } 419 pns = lsquic_enclev2pns[hp->hp_enc_level]; 420 return decode_packno(enc_sess->esi_max_packno[pns], packno, shift); 421} 422 423 424static int 425gen_trans_params (struct enc_sess_iquic *enc_sess, unsigned char *buf, 426 size_t bufsz) 427{ 428 const struct lsquic_engine_settings *const settings = 429 &enc_sess->esi_enpub->enp_settings; 430 struct transport_params params; 431 int len; 432 433 memset(¶ms, 0, sizeof(params)); 434 if (enc_sess->esi_flags & ESI_SERVER) 435 { 436 const struct lsquic_conn *const lconn = enc_sess->esi_conn; 437 438 params.tp_flags |= TRAPA_SERVER|TRAPA_RESET_TOKEN; 439 440 lsquic_tg_generate_sreset(enc_sess->esi_enpub->enp_tokgen, 441 CN_SCID(lconn), params.tp_stateless_reset_token); 442 443 if (enc_sess->esi_flags & ESI_ODCID) 444 { 445 params.tp_original_cid = enc_sess->esi_odcid; 446 params.tp_flags |= TRAPA_ORIGINAL_CID; 447 } 448#if LSQUIC_PREFERRED_ADDR 449 char addr_buf[INET6_ADDRSTRLEN + 6 /* port */ + 1]; 450 const char *s, *colon; 451 struct lsquic_conn *conn; 452 struct conn_cid_elem *cce; 453 unsigned seqno; 454 s = getenv("LSQUIC_PREFERRED_ADDR4"); 455 if (s && strlen(s) < sizeof(addr_buf) && (colon = strchr(s, ':'))) 456 { 457 strncpy(addr_buf, s, colon - s); 458 addr_buf[colon - s] = '\0'; 459 inet_pton(AF_INET, addr_buf, params.tp_preferred_address.ipv4_addr); 460 params.tp_preferred_address.ipv4_port = atoi(colon + 1); 461 params.tp_flags |= TRAPA_PREFADDR_IPv4; 462 } 463 s = getenv("LSQUIC_PREFERRED_ADDR6"); 464 if (s && strlen(s) < sizeof(addr_buf) && (colon = strrchr(s, ':'))) 465 { 466 strncpy(addr_buf, s, colon - s); 467 addr_buf[colon - s] = '\0'; 468 inet_pton(AF_INET6, addr_buf, 469 params.tp_preferred_address.ipv6_addr); 470 params.tp_preferred_address.ipv6_port = atoi(colon + 1); 471 params.tp_flags |= TRAPA_PREFADDR_IPv6; 472 } 473 conn = enc_sess->esi_conn; 474 if ((params.tp_flags & (TRAPA_PREFADDR_IPv4|TRAPA_PREFADDR_IPv6)) 475 && (1 << conn->cn_n_cces) - 1 != conn->cn_cces_mask) 476 { 477 seqno = 0; 478 for (cce = lconn->cn_cces; cce < END_OF_CCES(lconn); ++cce) 479 { 480 if (lconn->cn_cces_mask & (1 << (cce - lconn->cn_cces))) 481 { 482 if ((cce->cce_flags & CCE_SEQNO) && cce->cce_seqno > seqno) 483 seqno = cce->cce_seqno; 484 } 485 else 486 break; 487 } 488 if (cce == END_OF_CCES(lconn)) 489 { 490 goto cant_use_prefaddr; 491 } 492 cce->cce_seqno = seqno + 1; 493 cce->cce_flags = CCE_SEQNO; 494 lsquic_generate_cid(&cce->cce_cid, 495 enc_sess->esi_enpub->enp_settings.es_scid_len); 496 /* Don't add to hash: migration must not start until *after* 497 * handshake is complete. 498 */ 499 conn->cn_cces_mask |= 1 << (cce - conn->cn_cces); 500 params.tp_preferred_address.cid = cce->cce_cid; 501 lsquic_tg_generate_sreset(enc_sess->esi_enpub->enp_tokgen, 502 ¶ms.tp_preferred_address.cid, 503 params.tp_preferred_address.srst); 504 } 505 else 506 { 507 cant_use_prefaddr: 508 params.tp_flags &= ~(TRAPA_PREFADDR_IPv4|TRAPA_PREFADDR_IPv6); 509 } 510#endif 511 } 512 params.tp_init_max_data = settings->es_init_max_data; 513 params.tp_init_max_stream_data_bidi_local 514 = settings->es_init_max_stream_data_bidi_local; 515 params.tp_init_max_stream_data_bidi_remote 516 = settings->es_init_max_stream_data_bidi_remote; 517 params.tp_init_max_stream_data_uni 518 = settings->es_init_max_stream_data_uni; 519 params.tp_init_max_streams_uni 520 = enc_sess->esi_max_streams_uni; 521 params.tp_init_max_streams_bidi 522 = settings->es_init_max_streams_bidi; 523 params.tp_ack_delay_exponent 524 = TP_DEF_ACK_DELAY_EXP; 525 params.tp_idle_timeout = settings->es_idle_timeout * 1000; 526 params.tp_max_ack_delay = TP_DEF_MAX_ACK_DELAY; 527 params.tp_max_packet_size = 1370 /* XXX: based on socket */; 528 params.tp_active_connection_id_limit = MAX_IETF_CONN_DCIDS 529 - 1 /* One slot is used by peer's SCID */ 530 - !!(params.tp_flags & (TRAPA_PREFADDR_IPv4|TRAPA_PREFADDR_IPv6)); 531 if (!settings->es_allow_migration) 532 params.tp_disable_active_migration = 1; 533 534 len = lsquic_tp_encode(¶ms, buf, bufsz); 535 if (len >= 0) 536 LSQ_DEBUG("generated transport parameters buffer of %d bytes", len); 537 else 538 LSQ_WARN("cannot generate transport parameters: %d", errno); 539 return len; 540} 541 542 543/* 544 * Format: 545 * uint32_t lsquic_ver_tag_t 546 * uint32_t encoder version 547 * uint32_t ticket_size 548 * uint8_t ticket_buf[ ticket_size ] 549 * uint32_t trapa_size 550 * uint8_t trapa_buf[ trapa_size ] 551 */ 552 553#define ZERO_RTT_VERSION 1 554 555#if __BYTE_ORDER == __LITTLE_ENDIAN 556#define READ_NUM(var_, ptr_) do { \ 557 memcpy(&var_, ptr_, sizeof(var_)); \ 558 var_ = bswap_32(var_); \ 559 ptr_ += sizeof(var_); \ 560} while (0) 561#else 562#define READ_NUM(var_, ptr_) do { \ 563 memcpy(&var_, ptr_, sizeof(var_)); \ 564 ptr_ += sizeof(var_); \ 565} while (0) 566#endif 567 568static SSL_SESSION * 569maybe_create_SSL_SESSION (struct enc_sess_iquic *enc_sess, 570 const SSL_CTX *ssl_ctx) 571{ 572 SSL_SESSION *ssl_session; 573 lsquic_ver_tag_t ver_tag; 574 enum lsquic_version quic_ver; 575 uint32_t rtt_ver, ticket_sz, trapa_sz; 576 const unsigned char *ticket_buf, *trapa_buf, *p; 577 const unsigned char *const end 578 = enc_sess->esi_zero_rtt_buf + enc_sess->esi_zero_rtt_sz; 579 580 if (enc_sess->esi_zero_rtt_sz 581 < sizeof(ver_tag) + sizeof(rtt_ver) + sizeof(ticket_sz)) 582 { 583 LSQ_DEBUG("rtt buf too short"); 584 return NULL; 585 } 586 587 p = enc_sess->esi_zero_rtt_buf; 588 memcpy(&ver_tag, p, sizeof(ver_tag)); 589 p += sizeof(ver_tag); 590 quic_ver = lsquic_tag2ver(ver_tag); 591 if (quic_ver != enc_sess->esi_ver_neg->vn_ver) 592 { 593 LSQ_DEBUG("negotiated version %s does not match that in the zero-rtt " 594 "info buffer", lsquic_ver2str[enc_sess->esi_ver_neg->vn_ver]); 595 return NULL; 596 } 597 598 READ_NUM(rtt_ver, p); 599 if (rtt_ver != ZERO_RTT_VERSION) 600 { 601 LSQ_DEBUG("cannot use zero-rtt buffer: encoded using %"PRIu32", " 602 "while current version is %u", rtt_ver, ZERO_RTT_VERSION); 603 return NULL; 604 } 605 606 READ_NUM(ticket_sz, p); 607 if (p + ticket_sz > end) 608 { 609 LSQ_WARN("truncated ticket buffer"); 610 return NULL; 611 } 612 613 ticket_buf = p; 614 p += ticket_sz; 615 616 if (p + sizeof(trapa_sz) > end) 617 { 618 LSQ_WARN("too short to read trapa size"); 619 return NULL; 620 } 621 622 READ_NUM(trapa_sz, p); 623 if (p + trapa_sz > end) 624 { 625 LSQ_WARN("truncated trapa buffer"); 626 return NULL; 627 } 628 trapa_buf = p; 629 p += trapa_sz; 630 assert(p == end); 631 632 (void) /* TODO */ trapa_buf; 633 634 ssl_session = SSL_SESSION_from_bytes(ticket_buf, ticket_sz, ssl_ctx); 635 if (!ssl_session) 636 { 637 LSQ_WARN("SSL_SESSION could not be parsed out"); 638 return NULL; 639 } 640 641 LSQ_INFO("instantiated SSL_SESSION from serialized buffer"); 642 return ssl_session; 643} 644 645 646static void 647init_frals (struct enc_sess_iquic *enc_sess) 648{ 649 struct frab_list *fral; 650 651 for (fral = enc_sess->esi_frals; fral < enc_sess->esi_frals 652 + sizeof(enc_sess->esi_frals) / sizeof(enc_sess->esi_frals[0]); 653 ++fral) 654 lsquic_frab_list_init(fral, 0x100, NULL, NULL, NULL); 655} 656 657 658static enc_session_t * 659iquic_esfi_create_client (const char *hostname, 660 struct lsquic_engine_public *enpub, struct lsquic_conn *lconn, 661 const lsquic_cid_t *dcid, const struct ver_neg *ver_neg, 662 void *crypto_streams[4], const struct crypto_stream_if *cryst_if, 663 const unsigned char *zero_rtt, size_t zero_rtt_sz, 664 struct lsquic_alarmset *alset, unsigned max_streams_uni) 665{ 666 struct enc_sess_iquic *enc_sess; 667 668 enc_sess = calloc(1, sizeof(*enc_sess)); 669 if (!enc_sess) 670 return NULL; 671 672 if (hostname) 673 { 674 enc_sess->esi_hostname = strdup(hostname); 675 if (!enc_sess->esi_hostname) 676 { 677 free(enc_sess); 678 return NULL; 679 } 680 } 681 else 682 enc_sess->esi_hostname = NULL; 683 684 enc_sess->esi_enpub = enpub; 685 enc_sess->esi_streams = crypto_streams; 686 enc_sess->esi_cryst_if = cryst_if; 687 enc_sess->esi_conn = lconn; 688 enc_sess->esi_ver_neg = ver_neg; 689 690 enc_sess->esi_dir[0] = evp_aead_seal; 691 enc_sess->esi_dir[1] = evp_aead_open; 692 693 LSQ_DEBUGC("created client, DCID: %"CID_FMT, CID_BITS(dcid)); 694 { 695 const char *log; 696 log = getenv("LSQUIC_LOG_SECRETS"); 697 if (log) 698 { 699 if (atoi(log)) 700 enc_sess->esi_flags |= ESI_LOG_SECRETS; 701 LSQ_DEBUG("will %slog secrets", atoi(log) ? "" : "not "); 702 } 703 } 704 705 init_frals(enc_sess); 706 707 if (0 != setup_handshake_keys(enc_sess, dcid)) 708 { 709 free(enc_sess); 710 return NULL; 711 } 712 713 /* Have to wait until the call to init_client() -- this is when the 714 * result of version negotiation is known. 715 */ 716 if (zero_rtt && zero_rtt_sz) 717 { 718 enc_sess->esi_zero_rtt_buf = malloc(zero_rtt_sz); 719 if (enc_sess->esi_zero_rtt_buf) 720 { 721 memcpy(enc_sess->esi_zero_rtt_buf, zero_rtt, zero_rtt_sz); 722 enc_sess->esi_zero_rtt_sz = zero_rtt_sz; 723 } 724 else 725 enc_sess->esi_zero_rtt_sz = 0; 726 } 727 else 728 { 729 enc_sess->esi_zero_rtt_buf = NULL; 730 enc_sess->esi_zero_rtt_sz = 0; 731 } 732 733 if (enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info) 734 enc_sess->esi_flags |= ESI_WANT_TICKET; 735 enc_sess->esi_alset = alset; 736 lsquic_alarmset_init_alarm(enc_sess->esi_alset, AL_SESS_TICKET, 737 no_sess_ticket, enc_sess); 738 739 enc_sess->esi_max_streams_uni = max_streams_uni; 740 741 return enc_sess; 742} 743 744 745static void 746iquic_esfi_set_streams (enc_session_t *enc_session_p, 747 void *(crypto_streams)[4], const struct crypto_stream_if *cryst_if) 748{ 749 struct enc_sess_iquic *const enc_sess = enc_session_p; 750 enc_sess->esi_streams = crypto_streams; 751 enc_sess->esi_cryst_if = cryst_if; 752} 753 754 755static enc_session_t * 756iquic_esfi_create_server (struct lsquic_engine_public *enpub, 757 struct lsquic_conn *lconn, const lsquic_cid_t *first_dcid, 758 void *(crypto_streams)[4], 759 const struct crypto_stream_if *cryst_if, 760 const struct lsquic_cid *odcid) 761{ 762 struct enc_sess_iquic *enc_sess; 763 764 enc_sess = calloc(1, sizeof(*enc_sess)); 765 if (!enc_sess) 766 return NULL; 767 768#ifndef NDEBUG 769 enc_sess->esi_sni_bypass = getenv("LSQUIC_SNI_BYPASS"); 770#endif 771 772 enc_sess->esi_flags = ESI_SERVER; 773 enc_sess->esi_streams = crypto_streams; 774 enc_sess->esi_cryst_if = cryst_if; 775 enc_sess->esi_enpub = enpub; 776 enc_sess->esi_conn = lconn; 777 778 enc_sess->esi_dir[0] = evp_aead_open; 779 enc_sess->esi_dir[1] = evp_aead_seal; 780 781 if (odcid) 782 { 783 enc_sess->esi_odcid = *odcid; 784 enc_sess->esi_flags |= ESI_ODCID; 785 } 786 787 init_frals(enc_sess); 788 789 { 790 const char *log; 791 log = getenv("LSQUIC_LOG_SECRETS"); 792 if (log) 793 { 794 if (atoi(log)) 795 enc_sess->esi_flags |= ESI_LOG_SECRETS; 796 LSQ_DEBUG("will %slog secrets", atoi(log) ? "" : "not "); 797 } 798 } 799 800 if (0 != setup_handshake_keys(enc_sess, first_dcid)) 801 { 802 free(enc_sess); 803 return NULL; 804 } 805 806 enc_sess->esi_max_streams_uni 807 = enpub->enp_settings.es_init_max_streams_uni; 808 809 return enc_sess; 810} 811 812 813static void 814log_crypto_pair (const struct enc_sess_iquic *enc_sess, 815 const struct crypto_ctx_pair *pair, const char *name) 816{ 817 char hexbuf[EVP_MAX_MD_SIZE * 2 + 1]; 818 LSQ_DEBUG("client %s key: %s", name, 819 HEXSTR(pair->ykp_ctx[0].yk_key_buf, pair->ykp_ctx[0].yk_key_sz, 820 hexbuf)); 821 LSQ_DEBUG("client %s iv: %s", name, 822 HEXSTR(pair->ykp_ctx[0].yk_iv_buf, pair->ykp_ctx[0].yk_iv_sz, 823 hexbuf)); 824 LSQ_DEBUG("server %s key: %s", name, 825 HEXSTR(pair->ykp_ctx[1].yk_key_buf, pair->ykp_ctx[1].yk_key_sz, 826 hexbuf)); 827 LSQ_DEBUG("server %s iv: %s", name, 828 HEXSTR(pair->ykp_ctx[1].yk_iv_buf, pair->ykp_ctx[1].yk_iv_sz, 829 hexbuf)); 830} 831 832 833static void 834log_hp (const struct enc_sess_iquic *enc_sess, 835 const struct header_prot *hp, const char *name) 836{ 837 char hexbuf[EVP_MAX_MD_SIZE * 2 + 1]; 838 LSQ_DEBUG("client %s hp: %s", name, 839 HEXSTR(hp->hp_buf[0], hp->hp_sz, hexbuf)); 840 LSQ_DEBUG("server %s hp: %s", name, 841 HEXSTR(hp->hp_buf[1], hp->hp_sz, hexbuf)); 842} 843 844 845/* [draft-ietf-quic-tls-12] Section 5.3.2 */ 846static int 847setup_handshake_keys (struct enc_sess_iquic *enc_sess, const lsquic_cid_t *cid) 848{ 849 const EVP_MD *const md = EVP_sha256(); 850 const EVP_AEAD *const aead = EVP_aead_aes_128_gcm(); 851 struct crypto_ctx_pair *pair; 852 struct header_prot *hp; 853 size_t hsk_secret_sz; 854 unsigned char hsk_secret[EVP_MAX_MD_SIZE]; 855 unsigned char secret[2][SHA256_DIGEST_LENGTH]; /* client, server */ 856 char hexbuf[EVP_MAX_MD_SIZE * 2 + 1]; 857 858 if (!enc_sess->esi_hsk_pairs) 859 { 860 enc_sess->esi_hsk_pairs = calloc(N_HSK_PAIRS, 861 sizeof(enc_sess->esi_hsk_pairs[0])); 862 enc_sess->esi_hsk_hps = calloc(N_HSK_PAIRS, 863 sizeof(enc_sess->esi_hsk_hps[0])); 864 if (!(enc_sess->esi_hsk_pairs && enc_sess->esi_hsk_hps)) 865 { 866 free(enc_sess->esi_hsk_pairs); 867 free(enc_sess->esi_hsk_hps); 868 return -1; 869 } 870 } 871 pair = &enc_sess->esi_hsk_pairs[ENC_LEV_CLEAR]; 872 pair->ykp_thresh = IQUIC_INVALID_PACKNO; 873 hp = &enc_sess->esi_hsk_hps[ENC_LEV_CLEAR]; 874 875 HKDF_extract(hsk_secret, &hsk_secret_sz, md, cid->idbuf, cid->len, 876 HSK_SALT, HSK_SALT_SZ); 877 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 878 { 879 LSQ_DEBUG("handshake salt: %s", HEXSTR(HSK_SALT, HSK_SALT_SZ, hexbuf)); 880 LSQ_DEBUG("handshake secret: %s", HEXSTR(hsk_secret, hsk_secret_sz, 881 hexbuf)); 882 } 883 884 lsquic_qhkdf_expand(md, hsk_secret, hsk_secret_sz, CLIENT_LABEL, 885 CLIENT_LABEL_SZ, secret[0], sizeof(secret[0])); 886 LSQ_DEBUG("client handshake secret: %s", 887 HEXSTR(secret[0], sizeof(secret[0]), hexbuf)); 888 if (0 != init_crypto_ctx(&pair->ykp_ctx[0], md, aead, secret[0], 889 sizeof(secret[0]), enc_sess->esi_dir[0])) 890 goto err; 891 lsquic_qhkdf_expand(md, hsk_secret, hsk_secret_sz, SERVER_LABEL, 892 SERVER_LABEL_SZ, secret[1], sizeof(secret[1])); 893 LSQ_DEBUG("server handshake secret: %s", 894 HEXSTR(secret[1], sizeof(secret[1]), hexbuf)); 895 if (0 != init_crypto_ctx(&pair->ykp_ctx[1], md, aead, secret[1], 896 sizeof(secret[1]), enc_sess->esi_dir[1])) 897 goto err; 898 899 /* [draft-ietf-quic-tls-12] Section 5.6.1: AEAD_AES_128_GCM implies 900 * 128-bit AES-CTR. 901 */ 902 hp->hp_cipher = EVP_aes_128_ecb(); 903 hp->hp_gen_mask = gen_hp_mask_aes; 904 hp->hp_enc_level = ENC_LEV_CLEAR; 905 derive_hp_secrets(hp, md, aead, sizeof(secret[0]), secret[0], secret[1]); 906 907 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 908 { 909 log_crypto_pair(enc_sess, pair, "handshake"); 910 log_hp(enc_sess, hp, "handshake"); 911 } 912 913 return 0; 914 915 err: 916 cleanup_crypto_ctx(&pair->ykp_ctx[0]); 917 cleanup_crypto_ctx(&pair->ykp_ctx[1]); 918 return -1; 919} 920 921 922static void 923free_handshake_keys (struct enc_sess_iquic *enc_sess) 924{ 925 struct crypto_ctx_pair *pair; 926 927 if (enc_sess->esi_hsk_pairs) 928 { 929 assert(enc_sess->esi_hsk_hps); 930 for (pair = enc_sess->esi_hsk_pairs; pair < 931 enc_sess->esi_hsk_pairs + N_HSK_PAIRS; ++pair) 932 { 933 cleanup_crypto_ctx(&pair->ykp_ctx[0]); 934 cleanup_crypto_ctx(&pair->ykp_ctx[1]); 935 } 936 free(enc_sess->esi_hsk_pairs); 937 enc_sess->esi_hsk_pairs = NULL; 938 free(enc_sess->esi_hsk_hps); 939 enc_sess->esi_hsk_hps = NULL; 940 } 941 else 942 assert(!enc_sess->esi_hsk_hps); 943} 944 945 946static void 947keylog_callback (const SSL *ssl, const char *line) 948{ 949 struct enc_sess_iquic *enc_sess; 950 951 enc_sess = SSL_get_ex_data(ssl, s_idx); 952 if (enc_sess->esi_keylog_handle) 953 enc_sess->esi_enpub->enp_kli->kli_log_line( 954 enc_sess->esi_keylog_handle, line); 955} 956 957 958static void 959maybe_setup_key_logging (struct enc_sess_iquic *enc_sess) 960{ 961 if (enc_sess->esi_enpub->enp_kli) 962 { 963 enc_sess->esi_keylog_handle = enc_sess->esi_enpub->enp_kli->kli_open( 964 enc_sess->esi_enpub->enp_kli_ctx, enc_sess->esi_conn); 965 LSQ_DEBUG("SSL keys %s be logged", 966 enc_sess->esi_keylog_handle ? "will" : "will not"); 967 } 968} 969 970 971static enum ssl_verify_result_t 972verify_server_cert_callback (SSL *ssl, uint8_t *out_alert) 973{ 974 struct enc_sess_iquic *enc_sess; 975 struct stack_st_X509 *chain; 976 int s; 977 978 enc_sess = SSL_get_ex_data(ssl, s_idx); 979 chain = SSL_get_peer_cert_chain(ssl); 980 if (!chain) 981 { 982 LSQ_ERROR("cannot get peer chain"); 983 return ssl_verify_invalid; 984 } 985 986 s = enc_sess->esi_enpub->enp_verify_cert( 987 enc_sess->esi_enpub->enp_verify_ctx, chain); 988 return s == 0 ? ssl_verify_ok : ssl_verify_invalid; 989} 990 991 992static int 993iquic_lookup_cert (SSL *ssl, void *arg) 994{ 995 struct enc_sess_iquic *const enc_sess = arg; 996 const struct network_path *path; 997 const char *server_name; 998 SSL_CTX *ssl_ctx; 999 1000 server_name = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name); 1001#ifndef NDEBUG 1002 if (!server_name) 1003 server_name = enc_sess->esi_sni_bypass; 1004#endif 1005 if (!server_name) 1006 { 1007 LSQ_DEBUG("cert lookup: server name is not set, error"); 1008 return 0; 1009 } 1010 1011 path = enc_sess->esi_conn->cn_if->ci_get_path(enc_sess->esi_conn, NULL); 1012 ssl_ctx = enc_sess->esi_enpub->enp_lookup_cert( 1013 enc_sess->esi_enpub->enp_cert_lu_ctx, NP_LOCAL_SA(path), 1014 server_name); 1015 1016 1017 if (ssl_ctx) 1018 { 1019 if (SSL_set_SSL_CTX(enc_sess->esi_ssl, ssl_ctx)) 1020 { 1021 LSQ_DEBUG("looked up cert for %s", server_name); 1022 if (enc_sess->esi_enpub->enp_kli) 1023 SSL_CTX_set_keylog_callback(ssl_ctx, keylog_callback); 1024 SSL_set_verify(enc_sess->esi_ssl, 1025 SSL_CTX_get_verify_mode(ssl_ctx), NULL); 1026 SSL_set_verify_depth(enc_sess->esi_ssl, 1027 SSL_CTX_get_verify_depth(ssl_ctx)); 1028 SSL_clear_options(enc_sess->esi_ssl, 1029 SSL_get_options(enc_sess->esi_ssl)); 1030 SSL_set_options(enc_sess->esi_ssl, 1031 SSL_CTX_get_options(ssl_ctx) & ~SSL_OP_NO_TLSv1_3); 1032 return 1; 1033 } 1034 else 1035 { 1036 LSQ_WARN("cannot set SSL_CTX"); 1037 return 0; 1038 } 1039 } 1040 else 1041 { 1042 LSQ_DEBUG("could not look up cert for %s", server_name); 1043 return 0; 1044 } 1045} 1046 1047 1048static void 1049iquic_esfi_set_conn (enc_session_t *enc_session_p, struct lsquic_conn *lconn) 1050{ 1051 struct enc_sess_iquic *const enc_sess = enc_session_p; 1052 enc_sess->esi_conn = lconn; 1053 LSQ_DEBUG("updated conn reference"); 1054} 1055 1056 1057static int 1058iquic_esfi_init_server (enc_session_t *enc_session_p) 1059{ 1060 struct enc_sess_iquic *const enc_sess = enc_session_p; 1061 const struct alpn_map *am; 1062 int transpa_len; 1063 SSL_CTX *ssl_ctx = NULL; 1064 union { 1065 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1066 unsigned char trans_params[sizeof(struct transport_params)]; 1067 } u; 1068 1069 for (am = s_alpns; am < s_alpns + sizeof(s_alpns) 1070 / sizeof(s_alpns[0]); ++am) 1071 if (am->version == enc_sess->esi_conn->cn_version) 1072 goto ok; 1073 1074 LSQ_ERROR("version %s has no matching ALPN", 1075 lsquic_ver2str[enc_sess->esi_conn->cn_version]); 1076 return -1; 1077 1078 ok: 1079 enc_sess->esi_alpn = am->alpn; 1080 1081 ssl_ctx = enc_sess->esi_enpub->enp_get_ssl_ctx( 1082 lsquic_conn_get_peer_ctx(enc_sess->esi_conn, NULL)); 1083 if (!ssl_ctx) 1084 { 1085 LSQ_ERROR("fetching SSL context associated with peer context failed"); 1086 return -1; 1087 } 1088 1089 enc_sess->esi_ssl = SSL_new(ssl_ctx); 1090 if (!enc_sess->esi_ssl) 1091 { 1092 LSQ_ERROR("cannot create SSL object: %s", 1093 ERR_error_string(ERR_get_error(), u.errbuf)); 1094 return -1; 1095 } 1096 if (!(SSL_set_quic_method(enc_sess->esi_ssl, &cry_quic_method))) 1097 { 1098 LSQ_INFO("could not set stream method"); 1099 return -1; 1100 } 1101 maybe_setup_key_logging(enc_sess); 1102 1103 transpa_len = gen_trans_params(enc_sess, u.trans_params, 1104 sizeof(u.trans_params)); 1105 if (transpa_len < 0) 1106 return -1; 1107 1108 if (1 != SSL_set_quic_transport_params(enc_sess->esi_ssl, u.trans_params, 1109 transpa_len)) 1110 { 1111 LSQ_ERROR("cannot set QUIC transport params: %s", 1112 ERR_error_string(ERR_get_error(), u.errbuf)); 1113 return -1; 1114 } 1115 1116 SSL_clear_options(enc_sess->esi_ssl, SSL_OP_NO_TLSv1_3); 1117 SSL_set_cert_cb(enc_sess->esi_ssl, iquic_lookup_cert, enc_sess); 1118 SSL_set_ex_data(enc_sess->esi_ssl, s_idx, enc_sess); 1119 SSL_set_accept_state(enc_sess->esi_ssl); 1120 LSQ_DEBUG("initialized server enc session"); 1121 enc_sess->esi_flags |= ESI_INITIALIZED; 1122 return 0; 1123} 1124 1125 1126#if __BYTE_ORDER == __LITTLE_ENDIAN 1127#define WRITE_NUM(var_, val_, ptr_) do { \ 1128 var_ = (val_); \ 1129 var_ = bswap_32(var_); \ 1130 memcpy((ptr_), &var_, sizeof(var_)); \ 1131 ptr_ += sizeof(var_); \ 1132} while (0) 1133#else 1134#define WRITE_NUM(var_, val_, ptr_) do { \ 1135 var_ = (val_); \ 1136 memcpy((ptr_), &var_, sizeof(var_)); \ 1137 ptr_ += sizeof(var_); \ 1138} while (0) 1139#endif 1140 1141static int 1142iquic_new_session_cb (SSL *ssl, SSL_SESSION *session) 1143{ 1144 struct enc_sess_iquic *enc_sess; 1145 uint32_t num; 1146 unsigned char *p, *buf; 1147 uint8_t *ticket_buf; 1148 size_t ticket_sz; 1149 lsquic_ver_tag_t tag; 1150 const uint8_t *trapa_buf; 1151 size_t trapa_sz, buf_sz; 1152 1153 enc_sess = SSL_get_ex_data(ssl, s_idx); 1154 assert(enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info); 1155 1156 SSL_get_peer_quic_transport_params(enc_sess->esi_ssl, &trapa_buf, 1157 &trapa_sz); 1158 if (!(trapa_buf + trapa_sz)) 1159 { 1160 LSQ_WARN("no transport parameters: cannot generate zero-rtt info"); 1161 return 0; 1162 } 1163 if (trapa_sz > UINT32_MAX) 1164 { 1165 LSQ_WARN("trapa size too large: %zu", trapa_sz); 1166 return 0; 1167 } 1168 1169 if (!SSL_SESSION_to_bytes(session, &ticket_buf, &ticket_sz)) 1170 { 1171 LSQ_INFO("could not serialize new session"); 1172 return 0; 1173 } 1174 if (ticket_sz > UINT32_MAX) 1175 { 1176 LSQ_WARN("ticket size too large: %zu", ticket_sz); 1177 OPENSSL_free(ticket_buf); 1178 return 0; 1179 } 1180 1181 buf_sz = sizeof(tag) + sizeof(uint32_t) + sizeof(uint32_t) 1182 + ticket_sz + sizeof(uint32_t) + trapa_sz; 1183 buf = malloc(buf_sz); 1184 if (!buf) 1185 { 1186 OPENSSL_free(ticket_buf); 1187 LSQ_WARN("%s: malloc failed", __func__); 1188 return 0; 1189 } 1190 1191 p = buf; 1192 tag = lsquic_ver2tag(enc_sess->esi_conn->cn_version); 1193 memcpy(p, &tag, sizeof(tag)); 1194 p += sizeof(tag); 1195 1196 WRITE_NUM(num, ZERO_RTT_VERSION, p); 1197 WRITE_NUM(num, ticket_sz, p); 1198 memcpy(p, ticket_buf, ticket_sz); 1199 p += ticket_sz; 1200 WRITE_NUM(num, trapa_sz, p); 1201 memcpy(p, trapa_buf, trapa_sz); 1202 p += trapa_sz; 1203 1204 assert(buf + buf_sz == p); 1205 OPENSSL_free(ticket_buf); 1206 1207 LSQ_DEBUG("generated %zu bytes of zero-rtt buffer", buf_sz); 1208 1209 enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info(enc_sess->esi_conn, 1210 buf, buf_sz); 1211 free(buf); 1212 enc_sess->esi_flags &= ~ESI_WANT_TICKET; 1213 lsquic_alarmset_unset(enc_sess->esi_alset, AL_SESS_TICKET); 1214 return 0; 1215} 1216 1217 1218static int 1219init_client (struct enc_sess_iquic *const enc_sess) 1220{ 1221 SSL_CTX *ssl_ctx; 1222 SSL_SESSION *ssl_session; 1223 const struct alpn_map *am; 1224 int transpa_len; 1225 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1226#define hexbuf errbuf /* This is a dual-purpose buffer */ 1227 unsigned char trans_params[0x80]; 1228 1229 for (am = s_alpns; am < s_alpns + sizeof(s_alpns) 1230 / sizeof(s_alpns[0]); ++am) 1231 if (am->version == enc_sess->esi_ver_neg->vn_ver) 1232 goto ok; 1233 1234 LSQ_ERROR("version %s has no matching ALPN", 1235 lsquic_ver2str[enc_sess->esi_ver_neg->vn_ver]); 1236 return -1; 1237 1238 ok: 1239 enc_sess->esi_alpn = am->alpn; 1240 LSQ_DEBUG("Create new SSL_CTX"); 1241 ssl_ctx = SSL_CTX_new(TLS_method()); 1242 if (!ssl_ctx) 1243 { 1244 LSQ_ERROR("cannot create SSL context: %s", 1245 ERR_error_string(ERR_get_error(), errbuf)); 1246 goto err; 1247 } 1248 SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_3_VERSION); 1249 SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION); 1250 SSL_CTX_set_default_verify_paths(ssl_ctx); 1251 SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_CLIENT); 1252 if (enc_sess->esi_enpub->enp_stream_if->on_zero_rtt_info) 1253 SSL_CTX_sess_set_new_cb(ssl_ctx, iquic_new_session_cb); 1254 if (enc_sess->esi_enpub->enp_kli) 1255 SSL_CTX_set_keylog_callback(ssl_ctx, keylog_callback); 1256 if (enc_sess->esi_enpub->enp_verify_cert) 1257 SSL_CTX_set_custom_verify(ssl_ctx, SSL_VERIFY_PEER, 1258 verify_server_cert_callback); 1259 SSL_CTX_set_early_data_enabled(ssl_ctx, 1); 1260 1261 transpa_len = gen_trans_params(enc_sess, trans_params, 1262 sizeof(trans_params)); 1263 if (transpa_len < 0) 1264 { 1265 goto err; 1266 } 1267 1268 enc_sess->esi_ssl = SSL_new(ssl_ctx); 1269 if (!enc_sess->esi_ssl) 1270 { 1271 LSQ_ERROR("cannot create SSL object: %s", 1272 ERR_error_string(ERR_get_error(), errbuf)); 1273 goto err; 1274 } 1275 if (!(SSL_set_quic_method(enc_sess->esi_ssl, &cry_quic_method))) 1276 { 1277 LSQ_INFO("could not set stream method"); 1278 goto err; 1279 } 1280 maybe_setup_key_logging(enc_sess); 1281 if (1 != SSL_set_quic_transport_params(enc_sess->esi_ssl, trans_params, 1282 transpa_len)) 1283 { 1284 LSQ_ERROR("cannot set QUIC transport params: %s", 1285 ERR_error_string(ERR_get_error(), errbuf)); 1286 goto err; 1287 } 1288 if (0 != SSL_set_alpn_protos(enc_sess->esi_ssl, am->alpn, am->alpn[0] + 1)) 1289 { 1290 LSQ_ERROR("cannot set ALPN: %s", 1291 ERR_error_string(ERR_get_error(), errbuf)); 1292 goto err; 1293 } 1294 if (1 != SSL_set_tlsext_host_name(enc_sess->esi_ssl, 1295 enc_sess->esi_hostname)) 1296 { 1297 LSQ_ERROR("cannot set hostname: %s", 1298 ERR_error_string(ERR_get_error(), errbuf)); 1299 goto err; 1300 } 1301 free(enc_sess->esi_hostname); 1302 enc_sess->esi_hostname = NULL; 1303 if (enc_sess->esi_zero_rtt_buf) 1304 { 1305 ssl_session = maybe_create_SSL_SESSION(enc_sess, ssl_ctx); 1306 if (ssl_session) 1307 { 1308 if (SSL_set_session(enc_sess->esi_ssl, ssl_session)) 1309 enc_sess->esi_flags |= ESI_USE_SSL_TICKET; 1310 else 1311 LSQ_WARN("cannot set session"); 1312 } 1313 } 1314 1315 SSL_set_ex_data(enc_sess->esi_ssl, s_idx, enc_sess); 1316 SSL_set_connect_state(enc_sess->esi_ssl); 1317 SSL_CTX_free(ssl_ctx); 1318 LSQ_DEBUG("initialized client enc session"); 1319 enc_sess->esi_flags |= ESI_INITIALIZED; 1320 return 0; 1321 1322 err: 1323 if (ssl_ctx) 1324 SSL_CTX_free(ssl_ctx); 1325 return -1; 1326#undef hexbuf 1327} 1328 1329 1330struct crypto_params 1331{ 1332 const EVP_AEAD *aead; 1333 const EVP_MD *md; 1334 const EVP_CIPHER *hp; 1335 gen_hp_mask_f gen_hp_mask; 1336}; 1337 1338 1339static int 1340get_crypto_params (const struct enc_sess_iquic *enc_sess, 1341 struct crypto_params *params) 1342{ 1343 const SSL_CIPHER *cipher; 1344 unsigned key_sz, iv_sz; 1345 uint32_t id; 1346 1347 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 1348 id = SSL_CIPHER_get_id(cipher); 1349 1350 LSQ_DEBUG("Negotiated cipher ID is 0x%"PRIX32, id); 1351 1352 /* RFC 8446, Appendix B.4 */ 1353 switch (id) 1354 { 1355 case 0x03000000 | 0x1301: /* TLS_AES_128_GCM_SHA256 */ 1356 params->md = EVP_sha256(); 1357 params->aead = EVP_aead_aes_128_gcm(); 1358 params->hp = EVP_aes_128_ecb(); 1359 params->gen_hp_mask = gen_hp_mask_aes; 1360 break; 1361 case 0x03000000 | 0x1302: /* TLS_AES_256_GCM_SHA384 */ 1362 params->md = EVP_sha384(); 1363 params->aead = EVP_aead_aes_256_gcm(); 1364 params->hp = EVP_aes_256_ecb(); 1365 params->gen_hp_mask = gen_hp_mask_aes; 1366 break; 1367 case 0x03000000 | 0x1303: /* TLS_CHACHA20_POLY1305_SHA256 */ 1368 params->md = EVP_sha256(); 1369 params->aead = EVP_aead_chacha20_poly1305(); 1370 params->hp = NULL; 1371 params->gen_hp_mask = gen_hp_mask_chacha20; 1372 break; 1373 default: 1374 /* TLS_AES_128_CCM_SHA256 and TLS_AES_128_CCM_8_SHA256 are not 1375 * supported by BoringSSL (grep for \b0x130[45]\b). 1376 */ 1377 LSQ_DEBUG("unsupported cipher 0x%"PRIX32, id); 1378 return -1; 1379 } 1380 1381 key_sz = EVP_AEAD_key_length(params->aead); 1382 if (key_sz > EVP_MAX_KEY_LENGTH) 1383 { 1384 LSQ_DEBUG("key size %u is too large", key_sz); 1385 return -1; 1386 } 1387 1388 iv_sz = EVP_AEAD_nonce_length(params->aead); 1389 if (iv_sz < 8) 1390 iv_sz = 8; /* [draft-ietf-quic-tls-11], Section 5.3 */ 1391 if (iv_sz > EVP_MAX_IV_LENGTH) 1392 { 1393 LSQ_DEBUG("iv size %u is too large", iv_sz); 1394 return -1; 1395 } 1396 1397 if (key_sz > EVP_MAX_KEY_LENGTH) 1398 { 1399 LSQ_DEBUG("PN size %u is too large", key_sz); 1400 return -1; 1401 } 1402 1403 return 0; 1404} 1405 1406 1407static int 1408get_peer_transport_params (struct enc_sess_iquic *enc_sess) 1409{ 1410 struct transport_params *const trans_params = &enc_sess->esi_peer_tp; 1411 const uint8_t *params_buf; 1412 size_t bufsz; 1413 char params_str[0x200]; 1414 1415 SSL_get_peer_quic_transport_params(enc_sess->esi_ssl, ¶ms_buf, &bufsz); 1416 if (!params_buf) 1417 { 1418 LSQ_DEBUG("no peer transport parameters"); 1419 return -1; 1420 } 1421 1422 LSQ_DEBUG("have peer transport parameters (%zu bytes)", bufsz); 1423 if (0 > lsquic_tp_decode(params_buf, bufsz, 1424 !(enc_sess->esi_flags & ESI_SERVER), 1425 trans_params)) 1426 { 1427 lsquic_hexdump(params_buf, bufsz, params_str, sizeof(params_str)); 1428 LSQ_DEBUG("could not parse peer transport parameters (%zd bytes):\n%s", 1429 bufsz, params_str); 1430 return -1; 1431 } 1432 1433 if ((enc_sess->esi_flags & (ESI_ODCID|ESI_SERVER)) == ESI_ODCID) 1434 { 1435 if (!(trans_params->tp_flags & TRAPA_ORIGINAL_CID)) 1436 { 1437 LSQ_DEBUG("server did not produce original DCID (ODCID)"); 1438 return -1; 1439 } 1440 if (LSQUIC_CIDS_EQ(&enc_sess->esi_odcid, 1441 &trans_params->tp_original_cid)) 1442 LSQ_DEBUG("ODCID values match"); 1443 else 1444 { 1445 if (LSQ_LOG_ENABLED(LSQ_LOG_DEBUG)) 1446 { 1447 char cidbuf[2][MAX_CID_LEN * 2 + 1]; 1448 lsquic_cid2str(&enc_sess->esi_odcid, cidbuf[0]); 1449 lsquic_cid2str(&trans_params->tp_original_cid, cidbuf[1]); 1450 LSQ_DEBUG("server provided ODCID %s that does not match " 1451 "our ODCID %s", cidbuf[1], cidbuf[0]); 1452 } 1453 return -1; 1454 } 1455 } 1456 1457 return 0; 1458} 1459 1460 1461static int 1462maybe_get_peer_transport_params (struct enc_sess_iquic *enc_sess) 1463{ 1464 int s; 1465 1466 if (enc_sess->esi_flags & ESI_HAVE_PEER_TP) 1467 return 0; 1468 1469 s = get_peer_transport_params(enc_sess); 1470 if (s == 0) 1471 enc_sess->esi_flags |= ESI_HAVE_PEER_TP; 1472 1473 return s; 1474} 1475 1476 1477static enum iquic_handshake_status 1478iquic_esfi_handshake (struct enc_sess_iquic *enc_sess) 1479{ 1480 int s, err; 1481 enum lsquic_hsk_status hsk_status; 1482 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1483 1484 s = SSL_do_handshake(enc_sess->esi_ssl); 1485 if (s <= 0) 1486 { 1487 err = SSL_get_error(enc_sess->esi_ssl, s); 1488 switch (err) 1489 { 1490 case SSL_ERROR_WANT_READ: 1491 LSQ_DEBUG("retry read"); 1492 return IHS_WANT_READ; 1493 case SSL_ERROR_WANT_WRITE: 1494 LSQ_DEBUG("retry write"); 1495 return IHS_WANT_WRITE; 1496 case SSL_ERROR_EARLY_DATA_REJECTED: 1497 LSQ_DEBUG("early data rejected"); 1498 hsk_status = LSQ_HSK_0RTT_FAIL; 1499 goto err; 1500 default: 1501 LSQ_DEBUG("handshake: %s", ERR_error_string(err, errbuf)); 1502 hsk_status = LSQ_HSK_FAIL; 1503 goto err; 1504 } 1505 } 1506 1507 1508 if (SSL_in_early_data(enc_sess->esi_ssl)) 1509 { 1510 LSQ_DEBUG("in early data"); 1511 if (enc_sess->esi_flags & ESI_SERVER) 1512 LSQ_DEBUG("TODO"); 1513 else 1514 return IHS_WANT_READ; 1515 } 1516 1517 hsk_status = LSQ_HSK_OK; 1518 LSQ_DEBUG("handshake reported complete"); 1519 EV_LOG_HSK_COMPLETED(LSQUIC_LOG_CONN_ID); 1520 /* The ESI_USE_SSL_TICKET flag indicates if the client attempted 0-RTT. 1521 * If the handshake is complete, and the client attempted 0-RTT, it 1522 * must have succeeded. 1523 */ 1524 if (enc_sess->esi_flags & ESI_USE_SSL_TICKET) 1525 { 1526 hsk_status = LSQ_HSK_0RTT_OK; 1527 EV_LOG_ZERO_RTT(LSQUIC_LOG_CONN_ID); 1528 } 1529 1530 if (0 != maybe_get_peer_transport_params(enc_sess)) 1531 { 1532 hsk_status = LSQ_HSK_FAIL; 1533 goto err; 1534 } 1535 1536 enc_sess->esi_flags |= ESI_HANDSHAKE_OK; 1537 enc_sess->esi_conn->cn_if->ci_hsk_done(enc_sess->esi_conn, hsk_status); 1538 1539 return IHS_STOP; /* XXX: what else can come on the crypto stream? */ 1540 1541 err: 1542 LSQ_DEBUG("handshake failed"); 1543 enc_sess->esi_conn->cn_if->ci_hsk_done(enc_sess->esi_conn, hsk_status); 1544 return IHS_STOP; 1545} 1546 1547 1548static enum iquic_handshake_status 1549iquic_esfi_post_handshake (struct enc_sess_iquic *enc_sess) 1550{ 1551 int s; 1552 1553 s = SSL_process_quic_post_handshake(enc_sess->esi_ssl); 1554 LSQ_DEBUG("SSL_process_quic_post_handshake() returned %d", s); 1555 if (s == 1) 1556 return IHS_WANT_READ; 1557 else 1558 { 1559 LSQ_DEBUG("TODO: abort connection?"); 1560 return IHS_STOP; 1561 } 1562} 1563 1564 1565static struct transport_params * 1566iquic_esfi_get_peer_transport_params (enc_session_t *enc_session_p) 1567{ 1568 struct enc_sess_iquic *const enc_sess = enc_session_p; 1569 1570 if (0 == maybe_get_peer_transport_params(enc_sess)) 1571 return &enc_sess->esi_peer_tp; 1572 else 1573 return NULL; 1574} 1575 1576 1577void 1578iquic_esfi_destroy (enc_session_t *enc_session_p) 1579{ 1580 struct enc_sess_iquic *const enc_sess = enc_session_p; 1581 struct frab_list *fral; 1582 LSQ_DEBUG("iquic_esfi_destroy"); 1583 1584 for (fral = enc_sess->esi_frals; fral < enc_sess->esi_frals 1585 + sizeof(enc_sess->esi_frals) / sizeof(enc_sess->esi_frals[0]); 1586 ++fral) 1587 lsquic_frab_list_cleanup(fral); 1588 if (enc_sess->esi_keylog_handle) 1589 enc_sess->esi_enpub->enp_kli->kli_close(enc_sess->esi_keylog_handle); 1590 if (enc_sess->esi_ssl) 1591 SSL_free(enc_sess->esi_ssl); 1592 1593 free_handshake_keys(enc_sess); 1594 1595 free(enc_sess->esi_zero_rtt_buf); 1596 free(enc_sess->esi_hostname); 1597 free(enc_sess); 1598} 1599 1600 1601/* See [draft-ietf-quic-tls-14], Section 4 */ 1602static const enum enc_level hety2el[] = 1603{ 1604 [HETY_NOT_SET] = ENC_LEV_FORW, 1605 [HETY_VERNEG] = 0, 1606 [HETY_INITIAL] = ENC_LEV_CLEAR, 1607 [HETY_RETRY] = 0, 1608 [HETY_HANDSHAKE] = ENC_LEV_INIT, 1609 [HETY_0RTT] = ENC_LEV_EARLY, 1610}; 1611 1612 1613static const enum header_type pns2hety[] = 1614{ 1615 [PNS_INIT] = HETY_INITIAL, 1616 [PNS_HSK] = HETY_HANDSHAKE, 1617 [PNS_APP] = HETY_NOT_SET, 1618}; 1619 1620 1621static const enum enc_level pns2enc_level[] = 1622{ 1623 [PNS_INIT] = ENC_LEV_CLEAR, 1624 [PNS_HSK] = ENC_LEV_INIT, 1625 [PNS_APP] = ENC_LEV_FORW, 1626}; 1627 1628 1629static enum enc_packout 1630iquic_esf_encrypt_packet (enc_session_t *enc_session_p, 1631 const struct lsquic_engine_public *enpub, struct lsquic_conn *lconn, 1632 struct lsquic_packet_out *packet_out) 1633{ 1634 struct enc_sess_iquic *const enc_sess = enc_session_p; 1635 unsigned char *dst; 1636 const struct crypto_ctx_pair *pair; 1637 const struct crypto_ctx *crypto_ctx; 1638 const struct header_prot *hp; 1639 enum enc_level enc_level; 1640 unsigned char nonce_buf[ sizeof(crypto_ctx->yk_iv_buf) + 8 ]; 1641 unsigned char *nonce, *begin_xor; 1642 lsquic_packno_t packno; 1643 size_t out_sz, dst_sz; 1644 int header_sz; 1645 int ipv6; 1646 unsigned packno_off, packno_len, cliser; 1647 enum packnum_space pns; 1648 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1649 1650 assert(lconn == enc_sess->esi_conn); 1651 1652 if (packet_out->po_flags & PO_MINI) 1653 { 1654 /* XXX TODO Don't rely on PO_MINI, generalize this logic */ 1655 assert(enc_sess->esi_flags & ESI_SERVER); 1656 enc_level = hety2el[ packet_out->po_header_type ]; 1657 } 1658 else 1659 { 1660 pns = lsquic_packet_out_pns(packet_out); 1661 /* TODO Obviously, will need more logic for 0-RTT */ 1662 enc_level = pns2enc_level[ pns ]; 1663 packet_out->po_header_type = pns2hety[ pns ]; 1664 } 1665 1666 cliser = !!(enc_sess->esi_flags & ESI_SERVER); 1667 if (enc_level == ENC_LEV_FORW) 1668 { 1669 pair = &enc_sess->esi_pairs[ enc_sess->esi_key_phase ]; 1670 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1671 hp = &enc_sess->esi_hp; 1672 } 1673 else if (enc_sess->esi_hsk_pairs) 1674 { 1675 pair = &enc_sess->esi_hsk_pairs[ enc_level ]; 1676 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1677 hp = &enc_sess->esi_hsk_hps[ enc_level ]; 1678 } 1679 else 1680 { 1681 assert(0); 1682 return ENCPA_BADCRYPT; 1683 } 1684 1685 if (UNLIKELY(0 == (crypto_ctx->yk_flags & YK_INITED))) 1686 { 1687 LSQ_WARN("encrypt crypto context at level %s not initialized", 1688 lsquic_enclev2str[enc_level]); 1689 return ENCPA_BADCRYPT; 1690 } 1691 1692 if (packet_out->po_data_sz < 3) 1693 { 1694 /* [draft-ietf-quic-tls-20] Section 5.4.2 */ 1695 enum packno_bits bits = lsquic_packet_out_packno_bits(packet_out); 1696 unsigned len = iquic_packno_bits2len(bits); 1697 if (packet_out->po_data_sz + len < 4) 1698 { 1699 len = 4 - packet_out->po_data_sz - len; 1700 memset(packet_out->po_data + packet_out->po_data_sz, 0, len); 1701 packet_out->po_data_sz += len; 1702 packet_out->po_frame_types |= QUIC_FTBIT_PADDING; 1703 LSQ_DEBUG("padded packet %"PRIu64" with %u bytes of PADDING", 1704 packet_out->po_packno, len); 1705 } 1706 } 1707 1708 dst_sz = lconn->cn_pf->pf_packout_size(lconn, packet_out); 1709 ipv6 = NP_IS_IPv6(packet_out->po_path); 1710 dst = enpub->enp_pmi->pmi_allocate(enpub->enp_pmi_ctx, 1711 packet_out->po_path->np_peer_ctx, dst_sz, ipv6); 1712 if (!dst) 1713 { 1714 LSQ_DEBUG("could not allocate memory for outgoing packet of size %zd", 1715 dst_sz); 1716 return ENCPA_NOMEM; 1717 } 1718 1719 /* Align nonce so we can perform XOR safely in one shot: */ 1720 begin_xor = nonce_buf + sizeof(nonce_buf) - 8; 1721 begin_xor = (unsigned char *) ((uintptr_t) begin_xor & ~0x7); 1722 nonce = begin_xor - crypto_ctx->yk_iv_sz + 8; 1723 memcpy(nonce, crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz); 1724 packno = packet_out->po_packno; 1725 if (s_log_seal_and_open) 1726 LSQ_DEBUG("seal: iv: %s; packno: 0x%"PRIX64, 1727 HEXSTR(crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz, s_str), packno); 1728#if __BYTE_ORDER == __LITTLE_ENDIAN 1729 packno = bswap_64(packno); 1730#endif 1731 *((uint64_t *) begin_xor) ^= packno; 1732 1733 header_sz = lconn->cn_pf->pf_gen_reg_pkt_header(lconn, packet_out, dst, 1734 dst_sz); 1735 if (header_sz < 0) 1736 goto err; 1737 if (enc_level == ENC_LEV_FORW) 1738 dst[0] |= enc_sess->esi_key_phase << 2; 1739 1740 if (s_log_seal_and_open) 1741 { 1742 LSQ_DEBUG("seal: nonce (%u bytes): %s", crypto_ctx->yk_iv_sz, 1743 HEXSTR(nonce, crypto_ctx->yk_iv_sz, s_str)); 1744 LSQ_DEBUG("seal: ad (%u bytes): %s", header_sz, 1745 HEXSTR(dst, header_sz, s_str)); 1746 LSQ_DEBUG("seal: in (%u bytes): %s", packet_out->po_data_sz, 1747 HEXSTR(packet_out->po_data, packet_out->po_data_sz, s_str)); 1748 } 1749 if (!EVP_AEAD_CTX_seal(&crypto_ctx->yk_aead_ctx, dst + header_sz, &out_sz, 1750 dst_sz - header_sz, nonce, crypto_ctx->yk_iv_sz, packet_out->po_data, 1751 packet_out->po_data_sz, dst, header_sz)) 1752 { 1753 LSQ_WARN("cannot seal packet #%"PRIu64": %s", packet_out->po_packno, 1754 ERR_error_string(ERR_get_error(), errbuf)); 1755 goto err; 1756 } 1757 assert(out_sz == dst_sz - header_sz); 1758 1759 lconn->cn_pf->pf_packno_info(lconn, packet_out, &packno_off, &packno_len); 1760#ifndef NDEBUG 1761 const unsigned sample_off = packno_off + 4; 1762 assert(sample_off + IQUIC_TAG_LEN <= dst_sz); 1763#endif 1764 apply_hp(enc_sess, hp, cliser, dst, packno_off, packno_len); 1765 1766 packet_out->po_enc_data = dst; 1767 packet_out->po_enc_data_sz = dst_sz; 1768 packet_out->po_sent_sz = dst_sz; 1769 packet_out->po_flags &= ~PO_IPv6; 1770 packet_out->po_flags |= PO_ENCRYPTED|PO_SENT_SZ|(ipv6 << POIPv6_SHIFT); 1771 lsquic_packet_out_set_enc_level(packet_out, enc_level); 1772 lsquic_packet_out_set_kp(packet_out, enc_sess->esi_key_phase); 1773 return ENCPA_OK; 1774 1775 err: 1776 enpub->enp_pmi->pmi_return(enpub->enp_pmi_ctx, 1777 packet_out->po_path->np_peer_ctx, dst, ipv6); 1778 return ENCPA_BADCRYPT; 1779} 1780 1781 1782static enum dec_packin 1783iquic_esf_decrypt_packet (enc_session_t *enc_session_p, 1784 struct lsquic_engine_public *enpub, const struct lsquic_conn *lconn, 1785 struct lsquic_packet_in *packet_in) 1786{ 1787 struct enc_sess_iquic *const enc_sess = enc_session_p; 1788 unsigned char *dst; 1789 struct crypto_ctx_pair *pair; 1790 const struct header_prot *hp; 1791 struct crypto_ctx *crypto_ctx = NULL; 1792 unsigned char nonce_buf[ sizeof(crypto_ctx->yk_iv_buf) + 8 ]; 1793 unsigned char *nonce, *begin_xor; 1794 unsigned sample_off, packno_len, cliser, key_phase; 1795 enum enc_level enc_level; 1796 enum packnum_space pns; 1797 lsquic_packno_t packno; 1798 size_t out_sz; 1799 enum dec_packin dec_packin; 1800 int s; 1801 const size_t dst_sz = packet_in->pi_data_sz; 1802 unsigned char new_secret[EVP_MAX_KEY_LENGTH]; 1803 struct crypto_ctx crypto_ctx_buf; 1804 char secret_str[EVP_MAX_KEY_LENGTH * 2 + 1]; 1805 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 1806 1807 dst = lsquic_mm_get_packet_in_buf(&enpub->enp_mm, dst_sz); 1808 if (!dst) 1809 { 1810 LSQ_WARN("cannot allocate memory to copy incoming packet data"); 1811 dec_packin = DECPI_NOMEM; 1812 goto err; 1813 } 1814 1815 enc_level = hety2el[packet_in->pi_header_type]; 1816 if (enc_level == ENC_LEV_FORW) 1817 hp = &enc_sess->esi_hp; 1818 else if (enc_sess->esi_hsk_pairs) 1819 hp = &enc_sess->esi_hsk_hps[ enc_level ]; 1820 else 1821 hp = NULL; 1822 1823 if (UNLIKELY(!(hp && header_prot_inited(hp)))) 1824 { 1825 LSQ_DEBUG("header protection for level %u not initialized yet", 1826 enc_level); 1827 dec_packin = DECPI_NOT_YET; 1828 goto err; 1829 } 1830 1831 /* Decrypt packet number. After this operation, packet_in is adjusted: 1832 * the packet number becomes part of the header. 1833 */ 1834 sample_off = packet_in->pi_header_sz + 4; 1835 if (sample_off + IQUIC_TAG_LEN > packet_in->pi_data_sz) 1836 { 1837 LSQ_INFO("packet data is too short: %hu bytes", 1838 packet_in->pi_data_sz); 1839 dec_packin = DECPI_TOO_SHORT; 1840 goto err; 1841 } 1842 cliser = !(enc_sess->esi_flags & ESI_SERVER); 1843 memcpy(dst, packet_in->pi_data, sample_off); 1844 packet_in->pi_packno = 1845 packno = strip_hp(enc_sess, hp, cliser, 1846 packet_in->pi_data + sample_off, 1847 dst, packet_in->pi_header_sz, &packno_len); 1848 1849 if (enc_level == ENC_LEV_FORW) 1850 { 1851 key_phase = (dst[0] & 0x04) > 0; 1852 if (key_phase == enc_sess->esi_key_phase) 1853 { 1854 pair = &enc_sess->esi_pairs[ key_phase ]; 1855 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1856 } 1857 else if (!is_valid_packno( 1858 enc_sess->esi_pairs[enc_sess->esi_key_phase].ykp_thresh) 1859 || packet_in->pi_packno 1860 > enc_sess->esi_pairs[enc_sess->esi_key_phase].ykp_thresh) 1861 { 1862 lsquic_qhkdf_expand(enc_sess->esi_md, 1863 enc_sess->esi_traffic_secrets[cliser], enc_sess->esi_trasec_sz, 1864 "traffic upd", 11, new_secret, enc_sess->esi_trasec_sz); 1865 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 1866 LSQ_DEBUG("key phase changed to %u, will try decrypting using " 1867 "new secret %s", key_phase, HEXSTR(new_secret, 1868 enc_sess->esi_trasec_sz, secret_str)); 1869 else 1870 LSQ_DEBUG("key phase changed to %u, will try decrypting using " 1871 "new secret", key_phase); 1872 crypto_ctx = &crypto_ctx_buf; 1873 crypto_ctx->yk_flags = 0; 1874 s = init_crypto_ctx(crypto_ctx, enc_sess->esi_md, 1875 enc_sess->esi_aead, new_secret, enc_sess->esi_trasec_sz, 1876 evp_aead_open); 1877 if (s != 0) 1878 { 1879 LSQ_ERROR("could not init open crypto ctx (key phase)"); 1880 dec_packin = DECPI_BADCRYPT; 1881 goto err; 1882 } 1883 } 1884 else 1885 { 1886 pair = &enc_sess->esi_pairs[ key_phase ]; 1887 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1888 if (UNLIKELY(0 == (crypto_ctx->yk_flags & YK_INITED))) 1889 { 1890 LSQ_DEBUG("supposedly older context is not initialized (key " 1891 "phase: %u)", key_phase); 1892 dec_packin = DECPI_BADCRYPT; 1893 goto err; 1894 } 1895 } 1896 } 1897 else 1898 { 1899 key_phase = 0; 1900 assert(enc_sess->esi_hsk_pairs); 1901 pair = &enc_sess->esi_hsk_pairs[ enc_level ]; 1902 crypto_ctx = &pair->ykp_ctx[ cliser ]; 1903 if (UNLIKELY(0 == (crypto_ctx->yk_flags & YK_INITED))) 1904 { 1905 LSQ_WARN("decrypt crypto context at level %s not initialized", 1906 lsquic_enclev2str[enc_level]); 1907 dec_packin = DECPI_BADCRYPT; 1908 goto err; 1909 } 1910 } 1911 1912 if (s_log_seal_and_open) 1913 LSQ_DEBUG("open: iv: %s; packno: 0x%"PRIX64, 1914 HEXSTR(crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz, s_str), packno); 1915 /* Align nonce so we can perform XOR safely in one shot: */ 1916 begin_xor = nonce_buf + sizeof(nonce_buf) - 8; 1917 begin_xor = (unsigned char *) ((uintptr_t) begin_xor & ~0x7); 1918 nonce = begin_xor - crypto_ctx->yk_iv_sz + 8; 1919 memcpy(nonce, crypto_ctx->yk_iv_buf, crypto_ctx->yk_iv_sz); 1920#if __BYTE_ORDER == __LITTLE_ENDIAN 1921 packno = bswap_64(packno); 1922#endif 1923 *((uint64_t *) begin_xor) ^= packno; 1924 1925 packet_in->pi_header_sz += packno_len; 1926 1927 if (s_log_seal_and_open) 1928 { 1929 LSQ_DEBUG("open: nonce (%u bytes): %s", crypto_ctx->yk_iv_sz, 1930 HEXSTR(nonce, crypto_ctx->yk_iv_sz, s_str)); 1931 LSQ_DEBUG("open: ad (%u bytes): %s", packet_in->pi_header_sz, 1932 HEXSTR(dst, packet_in->pi_header_sz, s_str)); 1933 LSQ_DEBUG("open: in (%u bytes): %s", packet_in->pi_data_sz 1934 - packet_in->pi_header_sz, HEXSTR(packet_in->pi_data 1935 + packet_in->pi_header_sz, packet_in->pi_data_sz 1936 - packet_in->pi_header_sz, s_str)); 1937 } 1938 if (!EVP_AEAD_CTX_open(&crypto_ctx->yk_aead_ctx, 1939 dst + packet_in->pi_header_sz, &out_sz, 1940 dst_sz - packet_in->pi_header_sz, nonce, crypto_ctx->yk_iv_sz, 1941 packet_in->pi_data + packet_in->pi_header_sz, 1942 packet_in->pi_data_sz - packet_in->pi_header_sz, 1943 dst, packet_in->pi_header_sz)) 1944 { 1945 LSQ_INFO("cannot open packet #%"PRIu64": %s", packet_in->pi_packno, 1946 ERR_error_string(ERR_get_error(), errbuf)); 1947 dec_packin = DECPI_BADCRYPT; 1948 goto err; 1949 } 1950 1951 if (dst[0] & (0x0C << (packet_in->pi_header_type == HETY_NOT_SET))) 1952 { 1953 LSQ_DEBUG("reserved bits are not set to zero"); 1954 dec_packin = DECPI_VIOLATION; 1955 goto err; 1956 } 1957 1958 if (crypto_ctx == &crypto_ctx_buf) 1959 { 1960 LSQ_DEBUG("decryption in the new key phase %u successful, rotate " 1961 "keys", key_phase); 1962 pair = &enc_sess->esi_pairs[ key_phase ]; 1963 pair->ykp_thresh = packet_in->pi_packno; 1964 pair->ykp_ctx[ cliser ] = crypto_ctx_buf; 1965 memcpy(enc_sess->esi_traffic_secrets[ cliser ], new_secret, 1966 enc_sess->esi_trasec_sz); 1967 lsquic_qhkdf_expand(enc_sess->esi_md, 1968 enc_sess->esi_traffic_secrets[!cliser], enc_sess->esi_trasec_sz, 1969 "traffic upd", 11, new_secret, enc_sess->esi_trasec_sz); 1970 memcpy(enc_sess->esi_traffic_secrets[ !cliser ], new_secret, 1971 enc_sess->esi_trasec_sz); 1972 s = init_crypto_ctx(&pair->ykp_ctx[ !cliser ], enc_sess->esi_md, 1973 enc_sess->esi_aead, new_secret, enc_sess->esi_trasec_sz, 1974 evp_aead_seal); 1975 if (s != 0) 1976 { 1977 LSQ_ERROR("could not init seal crypto ctx (key phase)"); 1978 cleanup_crypto_ctx(&pair->ykp_ctx[ !cliser ]); 1979 /* XXX Is this the proper thing to do? Packet decrypted fine... */ 1980 dec_packin = DECPI_BADCRYPT; 1981 goto err; 1982 } 1983 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 1984 log_crypto_pair(enc_sess, pair, "updated"); 1985 enc_sess->esi_key_phase = key_phase; 1986 } 1987 1988 packet_in->pi_data_sz = packet_in->pi_header_sz + out_sz; 1989 if (packet_in->pi_flags & PI_OWN_DATA) 1990 lsquic_mm_put_packet_in_buf(&enpub->enp_mm, packet_in->pi_data, 1991 packet_in->pi_data_sz); 1992 packet_in->pi_data = dst; 1993 packet_in->pi_flags |= PI_OWN_DATA | PI_DECRYPTED 1994 | (enc_level << PIBIT_ENC_LEV_SHIFT); 1995 EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "decrypted packet %"PRIu64, 1996 packet_in->pi_packno); 1997 pns = lsquic_enclev2pns[enc_level]; 1998 if (packet_in->pi_packno > enc_sess->esi_max_packno[pns]) 1999 enc_sess->esi_max_packno[pns] = packet_in->pi_packno; 2000 /* XXX Compiler complains that `pair' may be uninitialized here, but this 2001 * variable is set in `if (crypto_ctx == &crypto_ctx_buf)' above. 2002 */ 2003 if (is_valid_packno(pair->ykp_thresh) 2004 && packet_in->pi_packno > pair->ykp_thresh) 2005 pair->ykp_thresh = packet_in->pi_packno; 2006 return DECPI_OK; 2007 2008 err: 2009 if (crypto_ctx == &crypto_ctx_buf) 2010 cleanup_crypto_ctx(crypto_ctx); 2011 if (dst) 2012 lsquic_mm_put_packet_in_buf(&enpub->enp_mm, dst, dst_sz); 2013 EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "could not decrypt packet (type %s, " 2014 "number %"PRIu64")", lsquic_hety2str[packet_in->pi_header_type], 2015 packet_in->pi_packno); 2016 return dec_packin; 2017} 2018 2019 2020static const char * 2021iquic_esf_get_sni (enc_session_t *enc_session_p) 2022{ 2023 struct enc_sess_iquic *const enc_sess = enc_session_p; 2024 2025 return SSL_get_servername(enc_sess->esi_ssl, TLSEXT_NAMETYPE_host_name); 2026} 2027 2028 2029static int 2030iquic_esf_global_init (int flags) 2031{ 2032 s_idx = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL); 2033 if (s_idx >= 0) 2034 { 2035 LSQ_LOG1(LSQ_LOG_DEBUG, "SSL extra data index: %d", s_idx); 2036 return 0; 2037 } 2038 else 2039 { 2040 LSQ_LOG1(LSQ_LOG_ERROR, "%s: could not select index", __func__); 2041 return -1; 2042 } 2043} 2044 2045 2046static void 2047iquic_esf_global_cleanup (void) 2048{ 2049} 2050 2051 2052static void * 2053copy_X509 (void *cert) 2054{ 2055 X509_up_ref(cert); 2056 return cert; 2057} 2058 2059 2060static struct stack_st_X509 * 2061iquic_esf_get_server_cert_chain (enc_session_t *enc_session_p) 2062{ 2063 struct enc_sess_iquic *const enc_sess = enc_session_p; 2064 STACK_OF(X509) *chain; 2065 2066 if (enc_sess->esi_ssl) 2067 { 2068 chain = SSL_get_peer_cert_chain(enc_sess->esi_ssl); 2069 return (struct stack_st_X509 *) 2070 sk_deep_copy((const _STACK *) chain, sk_X509_call_copy_func, 2071 copy_X509, sk_X509_call_free_func, (void(*)(void*))X509_free); 2072 } 2073 else 2074 return NULL; 2075} 2076 2077 2078static const char * 2079iquic_esf_cipher (enc_session_t *enc_session_p) 2080{ 2081 struct enc_sess_iquic *const enc_sess = enc_session_p; 2082 const SSL_CIPHER *cipher; 2083 2084 if (enc_sess->esi_flags & ESI_CACHED_INFO) 2085 return enc_sess->esi_cached_info.cipher_name; 2086 else if (enc_sess->esi_ssl) 2087 { 2088 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 2089 return SSL_CIPHER_get_name(cipher); 2090 } 2091 else 2092 { 2093 LSQ_WARN("SSL session is not set"); 2094 return "null"; 2095 } 2096} 2097 2098 2099static int 2100iquic_esf_keysize (enc_session_t *enc_session_p) 2101{ 2102 struct enc_sess_iquic *const enc_sess = enc_session_p; 2103 const SSL_CIPHER *cipher; 2104 uint32_t id; 2105 2106 if (enc_sess->esi_flags & ESI_CACHED_INFO) 2107 return enc_sess->esi_cached_info.alg_bits / 8; 2108 else if (enc_sess->esi_ssl) 2109 { 2110 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 2111 id = SSL_CIPHER_get_id(cipher); 2112 2113 /* RFC 8446, Appendix B.4 */ 2114 switch (id) 2115 { 2116 case 0x03000000 | 0x1301: /* TLS_AES_128_GCM_SHA256 */ 2117 return 128 / 8; 2118 case 0x03000000 | 0x1302: /* TLS_AES_256_GCM_SHA384 */ 2119 return 256 / 8; 2120 case 0x03000000 | 0x1303: /* TLS_CHACHA20_POLY1305_SHA256 */ 2121 return 256 / 8; 2122 default: 2123 return -1; 2124 } 2125 } 2126 else 2127 { 2128 LSQ_WARN("SSL session is not set"); 2129 return -1; 2130 } 2131} 2132 2133 2134static int 2135iquic_esf_alg_keysize (enc_session_t *enc_session_p) 2136{ 2137 /* Modeled on SslConnection::getEnv() */ 2138 return iquic_esf_keysize(enc_session_p); 2139} 2140 2141 2142static int 2143iquic_esf_zero_rtt_enabled (enc_session_t *enc_session_p) 2144{ 2145 struct enc_sess_iquic *const enc_sess = enc_session_p; 2146 return enc_sess->esi_zero_rtt_buf != NULL; 2147} 2148 2149 2150int 2151iquic_esfi_reset_dcid (enc_session_t *enc_session_p, 2152 const lsquic_cid_t *old_dcid, const lsquic_cid_t *new_dcid) 2153{ 2154 struct enc_sess_iquic *const enc_sess = enc_session_p; 2155 2156 enc_sess->esi_odcid = *old_dcid; 2157 enc_sess->esi_flags |= ESI_ODCID; 2158 /* TODO: free previous handshake keys */ 2159 if (0 == setup_handshake_keys(enc_sess, new_dcid)) 2160 { 2161 LSQ_INFOC("reset DCID to %"CID_FMT, CID_BITS(new_dcid)); 2162 return 0; 2163 } 2164 else 2165 return -1; 2166} 2167 2168 2169static void 2170iquic_esfi_1rtt_acked (enc_session_t *sess) 2171{ 2172 struct enc_sess_iquic *enc_sess = (struct enc_sess_iquic *) sess; 2173 2174 if (!(enc_sess->esi_flags & ESI_1RTT_ACKED)) 2175 { 2176 LSQ_DEBUG("1RTT packet has been acked"); 2177 enc_sess->esi_flags |= ESI_1RTT_ACKED; 2178 maybe_drop_SSL(enc_sess); 2179 } 2180} 2181 2182 2183static void iquic_esfi_shake_stream (enc_session_t *sess, 2184 struct lsquic_stream *stream, const char *what); 2185 2186 2187const struct enc_session_funcs_iquic lsquic_enc_session_iquic_ietf_v1 = 2188{ 2189 .esfi_create_client = iquic_esfi_create_client, 2190 .esfi_destroy = iquic_esfi_destroy, 2191 .esfi_get_peer_transport_params 2192 = iquic_esfi_get_peer_transport_params, 2193 .esfi_reset_dcid = iquic_esfi_reset_dcid, 2194 .esfi_init_server = iquic_esfi_init_server, 2195 .esfi_set_conn = iquic_esfi_set_conn, 2196 .esfi_set_streams = iquic_esfi_set_streams, 2197 .esfi_create_server = iquic_esfi_create_server, 2198 .esfi_shake_stream = iquic_esfi_shake_stream, 2199 .esfi_1rtt_acked = iquic_esfi_1rtt_acked, 2200}; 2201 2202 2203const struct enc_session_funcs_common lsquic_enc_session_common_ietf_v1 = 2204{ 2205 .esf_encrypt_packet = iquic_esf_encrypt_packet, 2206 .esf_decrypt_packet = iquic_esf_decrypt_packet, 2207 .esf_global_cleanup = iquic_esf_global_cleanup, 2208 .esf_global_init = iquic_esf_global_init, 2209 .esf_tag_len = IQUIC_TAG_LEN, 2210 .esf_get_server_cert_chain 2211 = iquic_esf_get_server_cert_chain, 2212 .esf_get_sni = iquic_esf_get_sni, 2213 .esf_cipher = iquic_esf_cipher, 2214 .esf_keysize = iquic_esf_keysize, 2215 .esf_alg_keysize = iquic_esf_alg_keysize, 2216 .esf_is_zero_rtt_enabled = iquic_esf_zero_rtt_enabled, 2217}; 2218 2219 2220static void 2221cache_info (struct enc_sess_iquic *enc_sess) 2222{ 2223 const SSL_CIPHER *cipher; 2224 2225 cipher = SSL_get_current_cipher(enc_sess->esi_ssl); 2226 enc_sess->esi_cached_info.cipher_name = SSL_CIPHER_get_name(cipher); 2227 SSL_CIPHER_get_bits(cipher, &enc_sess->esi_cached_info.alg_bits); 2228 enc_sess->esi_flags |= ESI_CACHED_INFO; 2229} 2230 2231 2232static void 2233drop_SSL (struct enc_sess_iquic *enc_sess) 2234{ 2235 LSQ_DEBUG("drop SSL object"); 2236 if (enc_sess->esi_conn->cn_if->ci_drop_crypto_streams) 2237 enc_sess->esi_conn->cn_if->ci_drop_crypto_streams( 2238 enc_sess->esi_conn); 2239 cache_info(enc_sess); 2240 SSL_free(enc_sess->esi_ssl); 2241 enc_sess->esi_ssl = NULL; 2242 free_handshake_keys(enc_sess); 2243} 2244 2245 2246static void 2247maybe_drop_SSL (struct enc_sess_iquic *enc_sess) 2248{ 2249 /* We rely on the following BoringSSL property: it writes new session 2250 * tickets before marking handshake as complete. In this case, the new 2251 * session tickets have either been successfully written to crypto stream, 2252 * in which case we can close it, or (unlikely) they are buffered in the 2253 * frab list. 2254 */ 2255 if ((enc_sess->esi_flags & (ESI_1RTT_ACKED|ESI_HANDSHAKE_OK)) 2256 == (ESI_1RTT_ACKED|ESI_HANDSHAKE_OK) 2257 && enc_sess->esi_ssl 2258 && lsquic_frab_list_empty(&enc_sess->esi_frals[ENC_LEV_FORW])) 2259 { 2260 if ((enc_sess->esi_flags & (ESI_SERVER|ESI_WANT_TICKET)) 2261 != ESI_WANT_TICKET) 2262 drop_SSL(enc_sess); 2263 else if (enc_sess->esi_alset 2264 && !lsquic_alarmset_is_set(enc_sess->esi_alset, AL_SESS_TICKET)) 2265 { 2266 LSQ_DEBUG("no session ticket: delay dropping SSL object"); 2267 lsquic_alarmset_set(enc_sess->esi_alset, AL_SESS_TICKET, 2268 /* Wait up to two seconds for session tickets */ 2269 lsquic_time_now() + 2000000); 2270 } 2271 } 2272} 2273 2274 2275static void 2276no_sess_ticket (enum alarm_id alarm_id, void *ctx, 2277 lsquic_time_t expiry, lsquic_time_t now) 2278{ 2279 struct enc_sess_iquic *enc_sess = ctx; 2280 2281 LSQ_DEBUG("no session tickets forthcoming -- drop SSL"); 2282 drop_SSL(enc_sess); 2283} 2284 2285 2286typedef char enums_have_the_same_value[ 2287 (int) ssl_encryption_initial == (int) ENC_LEV_CLEAR && 2288 (int) ssl_encryption_early_data == (int) ENC_LEV_EARLY && 2289 (int) ssl_encryption_handshake == (int) ENC_LEV_INIT && 2290 (int) ssl_encryption_application == (int) ENC_LEV_FORW ? 1 : -1]; 2291 2292static int 2293cry_sm_set_encryption_secret (SSL *ssl, enum ssl_encryption_level_t level, 2294 const uint8_t *read_secret, const uint8_t *write_secret, 2295 size_t secret_len) 2296{ 2297 struct enc_sess_iquic *enc_sess; 2298 struct crypto_ctx_pair *pair; 2299 struct header_prot *hp; 2300 struct crypto_params crypa; 2301 int i; 2302 int have_alpn; 2303 const unsigned char *alpn; 2304 unsigned alpn_len; 2305 const enum enc_level enc_level = (enum enc_level) level; 2306 const uint8_t *secrets[2]; 2307 char errbuf[ERR_ERROR_STRING_BUF_LEN]; 2308#define hexbuf errbuf 2309 2310 enc_sess = SSL_get_ex_data(ssl, s_idx); 2311 if (!enc_sess) 2312 return 0; 2313 2314 if ((enc_sess->esi_flags & (ESI_ALPN_CHECKED|ESI_SERVER)) == ESI_SERVER) 2315 { 2316 enc_sess->esi_flags |= ESI_ALPN_CHECKED; 2317 SSL_get0_alpn_selected(enc_sess->esi_ssl, &alpn, &alpn_len); 2318 have_alpn = alpn && alpn_len == enc_sess->esi_alpn[0] 2319 && 0 == memcmp(alpn, enc_sess->esi_alpn + 1, alpn_len); 2320 if (have_alpn) 2321 LSQ_DEBUG("Selected ALPN %.*s", (int) alpn_len, (char *) alpn); 2322 else 2323 { 2324 LSQ_INFO("No ALPN is selected: send fatal alert"); 2325 SSL_send_fatal_alert(ssl, ALERT_NO_APPLICATION_PROTOCOL); 2326 return 0; 2327 } 2328 } 2329 2330 if (0 != get_crypto_params(enc_sess, &crypa)) 2331 return 0; 2332 2333 if (enc_sess->esi_flags & ESI_SERVER) 2334 { 2335 if (enc_level != ENC_LEV_EARLY) 2336 secrets[0] = read_secret, secrets[1] = write_secret; 2337 else 2338 secrets[1] = read_secret, secrets[0] = write_secret; 2339 } 2340 else 2341 { 2342 if (enc_level != ENC_LEV_EARLY) 2343 secrets[0] = write_secret, secrets[1] = read_secret; 2344 else 2345 secrets[1] = write_secret, secrets[0] = read_secret; 2346 } 2347 2348 if (enc_level < ENC_LEV_FORW) 2349 { 2350 assert(enc_sess->esi_hsk_pairs); 2351 pair = &enc_sess->esi_hsk_pairs[enc_level]; 2352 hp = &enc_sess->esi_hsk_hps[enc_level]; 2353 } 2354 else 2355 { 2356 pair = &enc_sess->esi_pairs[0]; 2357 hp = &enc_sess->esi_hp; 2358 enc_sess->esi_trasec_sz = secret_len; 2359 memcpy(enc_sess->esi_traffic_secrets[0], secrets[0], secret_len); 2360 memcpy(enc_sess->esi_traffic_secrets[1], secrets[1], secret_len); 2361 enc_sess->esi_md = crypa.md; 2362 enc_sess->esi_aead = crypa.aead; 2363 } 2364 pair->ykp_thresh = IQUIC_INVALID_PACKNO; 2365 2366 LSQ_DEBUG("set encryption for level %u", enc_level); 2367 for (i = 1; i >= 0; --i) 2368 { 2369 if (secrets[i]) 2370 { 2371 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 2372 LSQ_DEBUG("new %s secret: %s", i ? "server" : "client", 2373 HEXSTR(secrets[i], secret_len, hexbuf)); 2374 if (0 != init_crypto_ctx(&pair->ykp_ctx[i], crypa.md, 2375 crypa.aead, secrets[i], secret_len, enc_sess->esi_dir[i])) 2376 goto err; 2377 } 2378 else 2379 assert(level == ssl_encryption_early_data); 2380 } 2381 2382 hp->hp_enc_level = enc_level; 2383 hp->hp_cipher = crypa.hp; 2384 hp->hp_gen_mask = crypa.gen_hp_mask; 2385 derive_hp_secrets(hp, crypa.md, crypa.aead, secret_len, secrets[0], 2386 secrets[1]); 2387 2388 if (enc_sess->esi_flags & ESI_LOG_SECRETS) 2389 { 2390 log_crypto_pair(enc_sess, pair, "new"); 2391 log_hp(enc_sess, hp, "new"); 2392 } 2393 2394 return 1; 2395 2396 err: 2397 cleanup_crypto_ctx(&pair->ykp_ctx[0]); 2398 cleanup_crypto_ctx(&pair->ykp_ctx[1]); 2399 return 0; 2400#undef hexbuf 2401} 2402 2403 2404static int 2405cry_sm_write_message (SSL *ssl, enum ssl_encryption_level_t level, 2406 const uint8_t *data, size_t len) 2407{ 2408 struct enc_sess_iquic *enc_sess; 2409 void *stream; 2410 ssize_t nw; 2411 2412 enc_sess = SSL_get_ex_data(ssl, s_idx); 2413 if (!enc_sess) 2414 return 0; 2415 2416 stream = enc_sess->esi_streams[level]; 2417 if (!stream) 2418 return 0; 2419 2420 /* The frab list logic is only applicable on the client. XXX This is 2421 * likely to change when support for key updates is added. 2422 */ 2423 if (enc_sess->esi_flags & (ESI_ON_WRITE|ESI_SERVER)) 2424 nw = enc_sess->esi_cryst_if->csi_write(stream, data, len); 2425 else 2426 { 2427 LSQ_DEBUG("not in on_write event: buffer in a frab list"); 2428 if (0 == lsquic_frab_list_write(&enc_sess->esi_frals[level], data, len)) 2429 { 2430 if (!lsquic_frab_list_empty(&enc_sess->esi_frals[level])) 2431 enc_sess->esi_cryst_if->csi_wantwrite(stream, 1); 2432 nw = len; 2433 } 2434 else 2435 nw = -1; 2436 } 2437 2438 if (nw >= 0 && (size_t) nw == len) 2439 { 2440 enc_sess->esi_last_w = (enum enc_level) level; 2441 LSQ_DEBUG("wrote %zu bytes to stream at encryption level %u", 2442 len, level); 2443 maybe_drop_SSL(enc_sess); 2444 return 1; 2445 } 2446 else 2447 { 2448 LSQ_INFO("could not write %zu bytes: returned %zd", len, nw); 2449 return 0; 2450 } 2451} 2452 2453 2454static int 2455cry_sm_flush_flight (SSL *ssl) 2456{ 2457 struct enc_sess_iquic *enc_sess; 2458 void *stream; 2459 unsigned level; 2460 int s; 2461 2462 enc_sess = SSL_get_ex_data(ssl, s_idx); 2463 if (!enc_sess) 2464 return 0; 2465 2466 level = enc_sess->esi_last_w; 2467 stream = enc_sess->esi_streams[level]; 2468 if (!stream) 2469 return 0; 2470 2471 if (lsquic_frab_list_empty(&enc_sess->esi_frals[level])) 2472 { 2473 s = enc_sess->esi_cryst_if->csi_flush(stream); 2474 return s == 0; 2475 } 2476 else 2477 /* Frab list will get flushed */ /* TODO: add support for 2478 recording flush points in frab list. */ 2479 return 1; 2480} 2481 2482 2483static int 2484cry_sm_send_alert (SSL *ssl, enum ssl_encryption_level_t level, uint8_t alert) 2485{ 2486 struct enc_sess_iquic *enc_sess; 2487 2488 enc_sess = SSL_get_ex_data(ssl, s_idx); 2489 if (!enc_sess) 2490 return 0; 2491 2492 LSQ_INFO("got alert %"PRIu8, alert); 2493 enc_sess->esi_conn->cn_if->ci_tls_alert(enc_sess->esi_conn, alert); 2494 2495 return 1; 2496} 2497 2498 2499static const SSL_QUIC_METHOD cry_quic_method = 2500{ 2501 .set_encryption_secrets = cry_sm_set_encryption_secret, 2502 .add_handshake_data = cry_sm_write_message, 2503 .flush_flight = cry_sm_flush_flight, 2504 .send_alert = cry_sm_send_alert, 2505}; 2506 2507 2508static lsquic_stream_ctx_t * 2509chsk_ietf_on_new_stream (void *stream_if_ctx, struct lsquic_stream *stream) 2510{ 2511 struct enc_sess_iquic *const enc_sess = stream_if_ctx; 2512 enum enc_level enc_level; 2513 2514 enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2515 if (enc_level != ENC_LEV_CLEAR) 2516 { 2517 LSQ_DEBUG("skip initialization of stream at level %u", enc_level); 2518 goto end; 2519 } 2520 2521 if ( 2522 (enc_sess->esi_flags & ESI_SERVER) == 0 && 2523 0 != init_client(enc_sess)) 2524 { 2525 LSQ_WARN("enc session could not be initialized"); 2526 return NULL; 2527 } 2528 2529 enc_sess->esi_cryst_if->csi_wantwrite(stream, 1); 2530 2531 LSQ_DEBUG("handshake stream created successfully"); 2532 2533 end: 2534 return stream_if_ctx; 2535} 2536 2537 2538static lsquic_stream_ctx_t * 2539shsk_ietf_on_new_stream (void *stream_if_ctx, struct lsquic_stream *stream) 2540{ 2541 struct enc_sess_iquic *const enc_sess = stream_if_ctx; 2542 enum enc_level enc_level; 2543 2544 enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2545 LSQ_DEBUG("on_new_stream called on level %u", enc_level); 2546 2547 enc_sess->esi_cryst_if->csi_wantread(stream, 1); 2548 2549 return stream_if_ctx; 2550} 2551 2552 2553static void 2554chsk_ietf_on_close (struct lsquic_stream *stream, lsquic_stream_ctx_t *ctx) 2555{ 2556 struct enc_sess_iquic *const enc_sess = (struct enc_sess_iquic *) ctx; 2557 LSQ_DEBUG("crypto stream level %u is closed", 2558 (unsigned) enc_sess->esi_cryst_if->csi_enc_level(stream)); 2559} 2560 2561 2562static const char *const ihs2str[] = { 2563 [IHS_WANT_READ] = "want read", 2564 [IHS_WANT_WRITE] = "want write", 2565 [IHS_STOP] = "stop", 2566}; 2567 2568 2569static void 2570iquic_esfi_shake_stream (enc_session_t *sess, 2571 struct lsquic_stream *stream, const char *what) 2572{ 2573 struct enc_sess_iquic *enc_sess = (struct enc_sess_iquic *)sess; 2574 enum iquic_handshake_status st; 2575 enum enc_level enc_level; 2576 int write; 2577 if (0 == (enc_sess->esi_flags & ESI_HANDSHAKE_OK)) 2578 st = iquic_esfi_handshake(enc_sess); 2579 else 2580 st = iquic_esfi_post_handshake(enc_sess); 2581 enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2582 LSQ_DEBUG("enc level %s after %s: %s", lsquic_enclev2str[enc_level], what, 2583 ihs2str[st]); 2584 switch (st) 2585 { 2586 case IHS_WANT_READ: 2587 write = !lsquic_frab_list_empty(&enc_sess->esi_frals[enc_level]); 2588 enc_sess->esi_cryst_if->csi_wantwrite(stream, write); 2589 enc_sess->esi_cryst_if->csi_wantread(stream, 1); 2590 break; 2591 case IHS_WANT_WRITE: 2592 enc_sess->esi_cryst_if->csi_wantwrite(stream, 1); 2593 enc_sess->esi_cryst_if->csi_wantread(stream, 0); 2594 break; 2595 default: 2596 assert(st == IHS_STOP); 2597 write = !lsquic_frab_list_empty(&enc_sess->esi_frals[enc_level]); 2598 enc_sess->esi_cryst_if->csi_wantwrite(stream, write); 2599 enc_sess->esi_cryst_if->csi_wantread(stream, 0); 2600 break; 2601 } 2602 LSQ_DEBUG("Exit shake_stream"); 2603 maybe_drop_SSL(enc_sess); 2604} 2605 2606 2607struct readf_ctx 2608{ 2609 struct enc_sess_iquic *enc_sess; 2610 enum enc_level enc_level; 2611 int err; 2612}; 2613 2614 2615static size_t 2616readf_cb (void *ctx, const unsigned char *buf, size_t len, int fin) 2617{ 2618 struct readf_ctx *const readf_ctx = (void *) ctx; 2619 struct enc_sess_iquic *const enc_sess = readf_ctx->enc_sess; 2620 int s; 2621 size_t str_sz; 2622 char str[MAX(1500 * 5, ERR_ERROR_STRING_BUF_LEN)]; 2623 2624 s = SSL_provide_quic_data(enc_sess->esi_ssl, 2625 (enum ssl_encryption_level_t) readf_ctx->enc_level, buf, len); 2626 if (s) 2627 { 2628 LSQ_DEBUG("provided %zu bytes of %u-level data to SSL", len, 2629 readf_ctx->enc_level); 2630 str_sz = lsquic_hexdump(buf, len, str, sizeof(str)); 2631 LSQ_DEBUG("\n%.*s", (int) str_sz, str); 2632 return len; 2633 } 2634 else 2635 { 2636 LSQ_WARN("SSL_provide_quic_data returned false: %s", 2637 ERR_error_string(ERR_get_error(), str)); 2638 readf_ctx->err++; 2639 return 0; 2640 } 2641} 2642 2643 2644static size_t 2645discard_cb (void *ctx, const unsigned char *buf, size_t len, int fin) 2646{ 2647 return len; 2648} 2649 2650 2651static void 2652chsk_ietf_on_read (struct lsquic_stream *stream, lsquic_stream_ctx_t *ctx) 2653{ 2654 struct enc_sess_iquic *const enc_sess = (void *) ctx; 2655 enum enc_level enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2656 struct readf_ctx readf_ctx = { enc_sess, enc_level, 0, }; 2657 ssize_t nread; 2658 2659 2660 if (enc_sess->esi_ssl) 2661 { 2662 nread = enc_sess->esi_cryst_if->csi_readf(stream, readf_cb, &readf_ctx); 2663 if (!(nread < 0 || readf_ctx.err)) 2664 iquic_esfi_shake_stream((enc_session_t *)enc_sess, stream, 2665 "on_read"); 2666 else 2667 enc_sess->esi_conn->cn_if->ci_internal_error(enc_sess->esi_conn, 2668 "shaking stream failed: nread: %zd, err: %d, SSL err: %"PRIu32, 2669 nread, readf_ctx.err, ERR_get_error()); 2670 } 2671 else 2672 { 2673 /* This branch is reached when we don't want TLS ticket and drop 2674 * the SSL object before we process TLS tickets that have been 2675 * already received and waiting in the incoming stream buffer. 2676 */ 2677 nread = enc_sess->esi_cryst_if->csi_readf(stream, discard_cb, NULL); 2678 lsquic_stream_wantread(stream, 0); 2679 LSQ_DEBUG("no SSL object: discard %zd bytes of SSL data", nread); 2680 } 2681} 2682 2683 2684static void 2685maybe_write_from_fral (struct enc_sess_iquic *enc_sess, 2686 struct lsquic_stream *stream) 2687{ 2688 enum enc_level enc_level = enc_sess->esi_cryst_if->csi_enc_level(stream); 2689 struct frab_list *const fral = &enc_sess->esi_frals[enc_level]; 2690 struct lsquic_reader reader = { 2691 .lsqr_read = lsquic_frab_list_read, 2692 .lsqr_size = lsquic_frab_list_size, 2693 .lsqr_ctx = fral, 2694 }; 2695 ssize_t nw; 2696 2697 if (lsquic_frab_list_empty(fral)) 2698 return; 2699 2700 nw = lsquic_stream_writef(stream, &reader); 2701 if (nw >= 0) 2702 { 2703 LSQ_DEBUG("wrote %zd bytes to stream from frab list", nw); 2704 (void) lsquic_stream_flush(stream); 2705 if (lsquic_frab_list_empty(fral)) 2706 lsquic_stream_wantwrite(stream, 0); 2707 } 2708 else 2709 { 2710 /* TODO: abort connection */ 2711 LSQ_WARN("cannot write to stream: %s", strerror(errno)); 2712 lsquic_stream_wantwrite(stream, 0); 2713 } 2714} 2715 2716 2717static void 2718chsk_ietf_on_write (struct lsquic_stream *stream, lsquic_stream_ctx_t *ctx) 2719{ 2720 struct enc_sess_iquic *const enc_sess = (void *) ctx; 2721 2722 maybe_write_from_fral(enc_sess, stream); 2723 2724 enc_sess->esi_flags |= ESI_ON_WRITE; 2725 iquic_esfi_shake_stream(enc_sess, stream, "on_write"); 2726 enc_sess->esi_flags &= ~ESI_ON_WRITE; 2727} 2728 2729 2730const struct lsquic_stream_if lsquic_cry_sm_if = 2731{ 2732 .on_new_stream = chsk_ietf_on_new_stream, 2733 .on_read = chsk_ietf_on_read, 2734 .on_write = chsk_ietf_on_write, 2735 .on_close = chsk_ietf_on_close, 2736}; 2737 2738 2739const struct lsquic_stream_if lsquic_mini_cry_sm_if = 2740{ 2741 .on_new_stream = shsk_ietf_on_new_stream, 2742 .on_read = chsk_ietf_on_read, 2743 .on_write = chsk_ietf_on_write, 2744 .on_close = chsk_ietf_on_close, 2745}; 2746 2747 2748struct ssl_st * 2749lsquic_hsk_getssl (lsquic_conn_t *conn) 2750{ 2751 if (!conn || !(conn->cn_flags & LSCONN_IETF)) 2752 return NULL; 2753 return ((struct enc_sess_iquic *)conn->cn_enc_session)->esi_ssl; 2754} 2755