_ Git - BearSSL/blob - client.c

   1 /*
   2  * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdint.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #include <netdb.h>
  35 #include <netinet/in.h>
  36 #include <arpa/inet.h>
  37 #include <unistd.h>
  38 #include <fcntl.h>
  39
  40 #include "brssl.h"
  41 #include "bearssl.h"
  42
  43 static int
  44 host_connect(const char *host, const char *port, int verbose)
  45 {
  46         struct addrinfo hints, *si, *p;
  47         int fd;
  48         int err;
  49
  50         memset(&hints, 0, sizeof hints);
  51         hints.ai_family = PF_UNSPEC;
  52         hints.ai_socktype = SOCK_STREAM;
  53         err = getaddrinfo(host, port, &hints, &si);
  54         if (err != 0) {
  55                 fprintf(stderr, "ERROR: getaddrinfo(): %s\n",
  56                         gai_strerror(err));
  57                 return -1;
  58         }
  59         fd = -1;
  60         for (p = si; p != NULL; p = p->ai_next) {
  61                 if (verbose) {
  62                         struct sockaddr *sa;
  63                         void *addr;
  64                         char tmp[INET6_ADDRSTRLEN + 50];
  65
  66                         sa = (struct sockaddr *)p->ai_addr;
  67                         if (sa->sa_family == AF_INET) {
  68                                 addr = &((struct sockaddr_in *)sa)->sin_addr;
  69                         } else if (sa->sa_family == AF_INET6) {
  70                                 addr = &((struct sockaddr_in6 *)sa)->sin6_addr;
  71                         } else {
  72                                 addr = NULL;
  73                         }
  74                         if (addr != NULL) {
  75                                 if (!inet_ntop(p->ai_family, addr,
  76                                         tmp, sizeof tmp))
  77                                 {
  78                                         strcpy(tmp, "<invalid>");
  79                                 }
  80                         } else {
  81                                 sprintf(tmp, "<unknown family: %d>",
  82                                         (int)sa->sa_family);
  83                         }
  84                         fprintf(stderr, "connecting to: %s\n", tmp);
  85                 }
  86                 fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
  87                 if (fd < 0) {
  88                         if (verbose) {
  89                                 perror("socket()");
  90                         }
  91                         continue;
  92                 }
  93                 if (connect(fd, p->ai_addr, p->ai_addrlen) < 0) {
  94                         if (verbose) {
  95                                 perror("connect()");
  96                         }
  97                         close(fd);
  98                         continue;
  99                 }
 100                 break;
 101         }
 102         if (p == NULL) {
 103                 freeaddrinfo(si);
 104                 fprintf(stderr, "ERROR: failed to connect\n");
 105                 return -1;
 106         }
 107         freeaddrinfo(si);
 108         if (verbose) {
 109                 fprintf(stderr, "connected.\n");
 110         }
 111
 112         /*
 113          * We make the socket non-blocking, since we are going to use
 114          * poll() to organise I/O.
 115          */
 116         fcntl(fd, F_SETFL, O_NONBLOCK);
 117         return fd;
 118 }
 119
 120 typedef struct {
 121         const br_ssl_client_certificate_class *vtable;
 122         int verbose;
 123         br_x509_certificate *chain;
 124         size_t chain_len;
 125         private_key *sk;
 126         int issuer_key_type;
 127 } ccert_context;
 128
 129 static void
 130 cc_start_name_list(const br_ssl_client_certificate_class **pctx)
 131 {
 132         ccert_context *zc;
 133
 134         zc = (ccert_context *)pctx;
 135         if (zc->verbose) {
 136                 fprintf(stderr, "Server requests a client certificate.\n");
 137                 fprintf(stderr, "--- anchor DN list start ---\n");
 138         }
 139 }
 140
 141 static void
 142 cc_start_name(const br_ssl_client_certificate_class **pctx, size_t len)
 143 {
 144         ccert_context *zc;
 145
 146         zc = (ccert_context *)pctx;
 147         if (zc->verbose) {
 148                 fprintf(stderr, "new anchor name, length = %u\n",
 149                         (unsigned)len);
 150         }
 151 }
 152
 153 static void
 154 cc_append_name(const br_ssl_client_certificate_class **pctx,
 155         const unsigned char *data, size_t len)
 156 {
 157         ccert_context *zc;
 158
 159         zc = (ccert_context *)pctx;
 160         if (zc->verbose) {
 161                 size_t u;
 162
 163                 for (u = 0; u < len; u ++) {
 164                         if (u == 0) {
 165                                 fprintf(stderr, "  ");
 166                         } else if (u > 0 && u % 16 == 0) {
 167                                 fprintf(stderr, "\n  ");
 168                         }
 169                         fprintf(stderr, " %02x", data[u]);
 170                 }
 171                 if (len > 0) {
 172                         fprintf(stderr, "\n");
 173                 }
 174         }
 175 }
 176
 177 static void
 178 cc_end_name(const br_ssl_client_certificate_class **pctx)
 179 {
 180         (void)pctx;
 181 }
 182
 183 static void
 184 cc_end_name_list(const br_ssl_client_certificate_class **pctx)
 185 {
 186         ccert_context *zc;
 187
 188         zc = (ccert_context *)pctx;
 189         if (zc->verbose) {
 190                 fprintf(stderr, "--- anchor DN list end ---\n");
 191         }
 192 }
 193
 194 static void
 195 print_hashes(unsigned hh, unsigned hh2)
 196 {
 197         int i;
 198
 199         for (i = 0; i < 8; i ++) {
 200                 const char *name;
 201
 202                 name = hash_function_name(i);
 203                 if (((hh >> i) & 1) != 0) {
 204                         fprintf(stderr, " %s", name);
 205                 } else if (((hh2 >> i) & 1) != 0) {
 206                         fprintf(stderr, " (%s)", name);
 207                 }
 208         }
 209 }
 210
 211 static int
 212 choose_hash(unsigned hh)
 213 {
 214         static const int f[] = {
 215                 br_sha256_ID, br_sha224_ID, br_sha384_ID, br_sha512_ID,
 216                 br_sha1_ID, br_md5sha1_ID, -1
 217         };
 218
 219         size_t u;
 220
 221         for (u = 0; f[u] >= 0; u ++) {
 222                 if (((hh >> f[u]) & 1) != 0) {
 223                         return f[u];
 224                 }
 225         }
 226         return -1;
 227 }
 228
 229 static void
 230 cc_choose(const br_ssl_client_certificate_class **pctx,
 231         const br_ssl_client_context *cc, uint32_t auth_types,
 232         br_ssl_client_certificate *choices)
 233 {
 234         ccert_context *zc;
 235         int scurve;
 236
 237         zc = (ccert_context *)pctx;
 238         scurve = br_ssl_client_get_server_curve(cc);
 239         if (zc->verbose) {
 240                 unsigned hashes;
 241
 242                 hashes = br_ssl_client_get_server_hashes(cc);
 243                 if ((auth_types & 0x00FF) != 0) {
 244                         fprintf(stderr, "supported: RSA signatures:");
 245                         print_hashes(auth_types, hashes);
 246                         fprintf(stderr, "\n");
 247                 }
 248                 if ((auth_types & 0xFF00) != 0) {
 249                         fprintf(stderr, "supported: ECDSA signatures:");
 250                         print_hashes(auth_types >> 8, hashes >> 8);
 251                         fprintf(stderr, "\n");
 252                 }
 253                 if ((auth_types & 0x010000) != 0) {
 254                         fprintf(stderr, "supported:"
 255                                 " fixed ECDH (cert signed with RSA)\n");
 256                 }
 257                 if ((auth_types & 0x020000) != 0) {
 258                         fprintf(stderr, "supported:"
 259                                 " fixed ECDH (cert signed with ECDSA)\n");
 260                 }
 261                 if (scurve) {
 262                         fprintf(stderr, "server key curve: %s (%d)\n",
 263                                 ec_curve_name(scurve), scurve);
 264                 } else {
 265                         fprintf(stderr, "server key is not EC\n");
 266                 }
 267         }
 268         switch (zc->sk->key_type) {
 269         case BR_KEYTYPE_RSA:
 270                 if ((choices->hash_id = choose_hash(auth_types)) >= 0) {
 271                         if (zc->verbose) {
 272                                 fprintf(stderr, "using RSA, hash = %d (%s)\n",
 273                                         choices->hash_id,
 274                                         hash_function_name(choices->hash_id));
 275                         }
 276                         choices->auth_type = BR_AUTH_RSA;
 277                         choices->chain = zc->chain;
 278                         choices->chain_len = zc->chain_len;
 279                         return;
 280                 }
 281                 break;
 282         case BR_KEYTYPE_EC:
 283                 if (zc->issuer_key_type != 0
 284                         && scurve == zc->sk->key.ec.curve)
 285                 {
 286                         int x;
 287
 288                         x = (zc->issuer_key_type == BR_KEYTYPE_RSA) ? 16 : 17;
 289                         if (((auth_types >> x) & 1) != 0) {
 290                                 if (zc->verbose) {
 291                                         fprintf(stderr, "using static ECDH\n");
 292                                 }
 293                                 choices->auth_type = BR_AUTH_ECDH;
 294                                 choices->hash_id = -1;
 295                                 choices->chain = zc->chain;
 296                                 choices->chain_len = zc->chain_len;
 297                                 return;
 298                         }
 299                 }
 300                 if ((choices->hash_id = choose_hash(auth_types >> 8)) >= 0) {
 301                         if (zc->verbose) {
 302                                 fprintf(stderr, "using ECDSA, hash = %d (%s)\n",
 303                                         choices->hash_id,
 304                                         hash_function_name(choices->hash_id));
 305                         }
 306                         choices->auth_type = BR_AUTH_ECDSA;
 307                         choices->chain = zc->chain;
 308                         choices->chain_len = zc->chain_len;
 309                         return;
 310                 }
 311                 break;
 312         }
 313         if (zc->verbose) {
 314                 fprintf(stderr, "no matching client certificate\n");
 315         }
 316         choices->chain = NULL;
 317         choices->chain_len = 0;
 318 }
 319
 320 static uint32_t
 321 cc_do_keyx(const br_ssl_client_certificate_class **pctx,
 322         unsigned char *data, size_t len)
 323 {
 324         ccert_context *zc;
 325
 326         zc = (ccert_context *)pctx;
 327         return br_ec_prime_i31.mul(data, len, zc->sk->key.ec.x,
 328                 zc->sk->key.ec.xlen, zc->sk->key.ec.curve);
 329 }
 330
 331 static size_t
 332 cc_do_sign(const br_ssl_client_certificate_class **pctx,
 333         int hash_id, size_t hv_len, unsigned char *data, size_t len)
 334 {
 335         ccert_context *zc;
 336         unsigned char hv[64];
 337
 338         zc = (ccert_context *)pctx;
 339         memcpy(hv, data, hv_len);
 340         switch (zc->sk->key_type) {
 341                 const br_hash_class *hc;
 342                 const unsigned char *hash_oid;
 343                 uint32_t x;
 344                 size_t sig_len;
 345
 346         case BR_KEYTYPE_RSA:
 347                 hash_oid = get_hash_oid(hash_id);
 348                 if (hash_oid == NULL && hash_id != 0) {
 349                         if (zc->verbose) {
 350                                 fprintf(stderr, "ERROR: cannot RSA-sign with"
 351                                         " unknown hash function: %d\n",
 352                                         hash_id);
 353                         }
 354                         return 0;
 355                 }
 356                 sig_len = (zc->sk->key.rsa.n_bitlen + 7) >> 3;
 357                 if (len < sig_len) {
 358                         if (zc->verbose) {
 359                                 fprintf(stderr, "ERROR: cannot RSA-sign,"
 360                                         " buffer is too small"
 361                                         " (sig=%lu, buf=%lu)\n",
 362                                         (unsigned long)sig_len,
 363                                         (unsigned long)len);
 364                         }
 365                         return 0;
 366                 }
 367                 x = br_rsa_i31_pkcs1_sign(hash_oid, hv, hv_len,
 368                         &zc->sk->key.rsa, data);
 369                 if (!x) {
 370                         if (zc->verbose) {
 371                                 fprintf(stderr, "ERROR: RSA-sign failure\n");
 372                         }
 373                         return 0;
 374                 }
 375                 return sig_len;
 376
 377         case BR_KEYTYPE_EC:
 378                 hc = get_hash_impl(hash_id);
 379                 if (hc == NULL) {
 380                         if (zc->verbose) {
 381                                 fprintf(stderr, "ERROR: cannot ECDSA-sign with"
 382                                         " unknown hash function: %d\n",
 383                                         hash_id);
 384                         }
 385                         return 0;
 386                 }
 387                 if (len < 139) {
 388                         if (zc->verbose) {
 389                                 fprintf(stderr, "ERROR: cannot ECDSA-sign"
 390                                         " (output buffer = %lu)\n",
 391                                         (unsigned long)len);
 392                         }
 393                         return 0;
 394                 }
 395                 sig_len = br_ecdsa_i31_sign_asn1(&br_ec_prime_i31,
 396                         hc, hv, &zc->sk->key.ec, data);
 397                 if (sig_len == 0) {
 398                         if (zc->verbose) {
 399                                 fprintf(stderr, "ERROR: ECDSA-sign failure\n");
 400                         }
 401                         return 0;
 402                 }
 403                 return sig_len;
 404
 405         default:
 406                 return 0;
 407         }
 408 }
 409
 410 static const br_ssl_client_certificate_class ccert_vtable = {
 411         sizeof(ccert_context),
 412         cc_start_name_list,
 413         cc_start_name,
 414         cc_append_name,
 415         cc_end_name,
 416         cc_end_name_list,
 417         cc_choose,
 418         cc_do_keyx,
 419         cc_do_sign
 420 };
 421
 422 static void
 423 free_alpn(void *alpn)
 424 {
 425         xfree(*(char **)alpn);
 426 }
 427
 428 static void
 429 usage_client(void)
 430 {
 431         fprintf(stderr,
 432 "usage: brssl client server[:port] [ options ]\n");
 433         fprintf(stderr,
 434 "options:\n");
 435         fprintf(stderr,
 436 "   -q              suppress verbose messages\n");
 437         fprintf(stderr,
 438 "   -trace          activate extra debug messages (dump of all packets)\n");
 439         fprintf(stderr,
 440 "   -sni name       use this specific name for SNI\n");
 441         fprintf(stderr,
 442 "   -nosni          do not send any SNI\n");
 443         fprintf(stderr,
 444 "   -mono           use monodirectional buffering\n");
 445         fprintf(stderr,
 446 "   -buf length     set the I/O buffer length (in bytes)\n");
 447         fprintf(stderr,
 448 "   -CA file        add certificates in 'file' to trust anchors\n");
 449         fprintf(stderr,
 450 "   -cert file      set client certificate chain\n");
 451         fprintf(stderr,
 452 "   -key file       set client private key (for certificate authentication)\n");
 453         fprintf(stderr,
 454 "   -nostaticecdh   prohibit full-static ECDH (client certificate)\n");
 455         fprintf(stderr,
 456 "   -list           list supported names (protocols, algorithms...)\n");
 457         fprintf(stderr,
 458 "   -vmin name      set minimum supported version (default: TLS-1.0)\n");
 459         fprintf(stderr,
 460 "   -vmax name      set maximum supported version (default: TLS-1.2)\n");
 461         fprintf(stderr,
 462 "   -cs names       set list of supported cipher suites (comma-separated)\n");
 463         fprintf(stderr,
 464 "   -hf names       add support for some hash functions (comma-separated)\n");
 465         fprintf(stderr,
 466 "   -minhello len   set minimum ClientHello length (in bytes)\n");
 467         fprintf(stderr,
 468 "   -fallback       send the TLS_FALLBACK_SCSV (i.e. claim a downgrade)\n");
 469         fprintf(stderr,
 470 "   -noreneg        prohibit renegotiations\n");
 471         fprintf(stderr,
 472 "   -alpn name      add protocol name to list of protocols (ALPN extension)\n");
 473         fprintf(stderr,
 474 "   -strictalpn     fail on ALPN mismatch\n");
 475 }
 476
 477 /* see brssl.h */
 478 int
 479 do_client(int argc, char *argv[])
 480 {
 481         int retcode;
 482         int verbose;
 483         int trace;
 484         int i, bidi;
 485         const char *server_name;
 486         char *host;
 487         char *port;
 488         const char *sni;
 489         anchor_list anchors = VEC_INIT;
 490         unsigned vmin, vmax;
 491         VECTOR(const char *) alpn_names = VEC_INIT;
 492         cipher_suite *suites;
 493         size_t num_suites;
 494         uint16_t *suite_ids;
 495         unsigned hfuns;
 496         size_t u;
 497         br_ssl_client_context cc;
 498         br_x509_minimal_context xc;
 499         x509_noanchor_context xwc;
 500         const br_hash_class *dnhash;
 501         ccert_context zc;
 502         br_x509_certificate *chain;
 503         size_t chain_len;
 504         private_key *sk;
 505         int nostaticecdh;
 506         unsigned char *iobuf;
 507         size_t iobuf_len;
 508         size_t minhello_len;
 509         int fallback;
 510         uint32_t flags;
 511         int fd;
 512
 513         retcode = 0;
 514         verbose = 1;
 515         trace = 0;
 516         server_name = NULL;
 517         host = NULL;
 518         port = NULL;
 519         sni = NULL;
 520         bidi = 1;
 521         vmin = 0;
 522         vmax = 0;
 523         suites = NULL;
 524         num_suites = 0;
 525         hfuns = 0;
 526         suite_ids = NULL;
 527         chain = NULL;
 528         chain_len = 0;
 529         sk = NULL;
 530         nostaticecdh = 0;
 531         iobuf = NULL;
 532         iobuf_len = 0;
 533         minhello_len = (size_t)-1;
 534         fallback = 0;
 535         flags = 0;
 536         fd = -1;
 537         for (i = 0; i < argc; i ++) {
 538                 const char *arg;
 539
 540                 arg = argv[i];
 541                 if (arg[0] != '-') {
 542                         if (server_name != NULL) {
 543                                 fprintf(stderr,
 544                                         "ERROR: duplicate server name\n");
 545                                 usage_client();
 546                                 goto client_exit_error;
 547                         }
 548                         server_name = arg;
 549                         continue;
 550                 }
 551                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 552                         verbose = 1;
 553                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 554                         verbose = 0;
 555                 } else if (eqstr(arg, "-trace")) {
 556                         trace = 1;
 557                 } else if (eqstr(arg, "-sni")) {
 558                         if (++ i >= argc) {
 559                                 fprintf(stderr,
 560                                         "ERROR: no argument for '-sni'\n");
 561                                 usage_client();
 562                                 goto client_exit_error;
 563                         }
 564                         if (sni != NULL) {
 565                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 566                                 usage_client();
 567                                 goto client_exit_error;
 568                         }
 569                         sni = argv[i];
 570                 } else if (eqstr(arg, "-nosni")) {
 571                         if (sni != NULL) {
 572                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 573                                 usage_client();
 574                                 goto client_exit_error;
 575                         }
 576                         sni = "";
 577                 } else if (eqstr(arg, "-mono")) {
 578                         bidi = 0;
 579                 } else if (eqstr(arg, "-buf")) {
 580                         if (++ i >= argc) {
 581                                 fprintf(stderr,
 582                                         "ERROR: no argument for '-buf'\n");
 583                                 usage_client();
 584                                 goto client_exit_error;
 585                         }
 586                         arg = argv[i];
 587                         if (iobuf_len != 0) {
 588                                 fprintf(stderr,
 589                                         "ERROR: duplicate I/O buffer length\n");
 590                                 usage_client();
 591                                 goto client_exit_error;
 592                         }
 593                         iobuf_len = parse_size(arg);
 594                         if (iobuf_len == (size_t)-1) {
 595                                 usage_client();
 596                                 goto client_exit_error;
 597                         }
 598                 } else if (eqstr(arg, "-CA")) {
 599                         if (++ i >= argc) {
 600                                 fprintf(stderr,
 601                                         "ERROR: no argument for '-CA'\n");
 602                                 usage_client();
 603                                 goto client_exit_error;
 604                         }
 605                         arg = argv[i];
 606                         if (read_trust_anchors(&anchors, arg) == 0) {
 607                                 usage_client();
 608                                 goto client_exit_error;
 609                         }
 610                 } else if (eqstr(arg, "-cert")) {
 611                         if (++ i >= argc) {
 612                                 fprintf(stderr,
 613                                         "ERROR: no argument for '-cert'\n");
 614                                 usage_client();
 615                                 goto client_exit_error;
 616                         }
 617                         if (chain != NULL) {
 618                                 fprintf(stderr,
 619                                         "ERROR: duplicate certificate chain\n");
 620                                 usage_client();
 621                                 goto client_exit_error;
 622                         }
 623                         arg = argv[i];
 624                         chain = read_certificates(arg, &chain_len);
 625                         if (chain == NULL || chain_len == 0) {
 626                                 goto client_exit_error;
 627                         }
 628                 } else if (eqstr(arg, "-key")) {
 629                         if (++ i >= argc) {
 630                                 fprintf(stderr,
 631                                         "ERROR: no argument for '-key'\n");
 632                                 usage_client();
 633                                 goto client_exit_error;
 634                         }
 635                         if (sk != NULL) {
 636                                 fprintf(stderr,
 637                                         "ERROR: duplicate private key\n");
 638                                 usage_client();
 639                                 goto client_exit_error;
 640                         }
 641                         arg = argv[i];
 642                         sk = read_private_key(arg);
 643                         if (sk == NULL) {
 644                                 goto client_exit_error;
 645                         }
 646                 } else if (eqstr(arg, "-nostaticecdh")) {
 647                         nostaticecdh = 1;
 648                 } else if (eqstr(arg, "-list")) {
 649                         list_names();
 650                         goto client_exit;
 651                 } else if (eqstr(arg, "-vmin")) {
 652                         if (++ i >= argc) {
 653                                 fprintf(stderr,
 654                                         "ERROR: no argument for '-vmin'\n");
 655                                 usage_client();
 656                                 goto client_exit_error;
 657                         }
 658                         arg = argv[i];
 659                         if (vmin != 0) {
 660                                 fprintf(stderr,
 661                                         "ERROR: duplicate minimum version\n");
 662                                 usage_client();
 663                                 goto client_exit_error;
 664                         }
 665                         vmin = parse_version(arg, strlen(arg));
 666                         if (vmin == 0) {
 667                                 fprintf(stderr,
 668                                         "ERROR: unrecognised version '%s'\n",
 669                                         arg);
 670                                 usage_client();
 671                                 goto client_exit_error;
 672                         }
 673                 } else if (eqstr(arg, "-vmax")) {
 674                         if (++ i >= argc) {
 675                                 fprintf(stderr,
 676                                         "ERROR: no argument for '-vmax'\n");
 677                                 usage_client();
 678                                 goto client_exit_error;
 679                         }
 680                         arg = argv[i];
 681                         if (vmax != 0) {
 682                                 fprintf(stderr,
 683                                         "ERROR: duplicate maximum version\n");
 684                                 usage_client();
 685                                 goto client_exit_error;
 686                         }
 687                         vmax = parse_version(arg, strlen(arg));
 688                         if (vmax == 0) {
 689                                 fprintf(stderr,
 690                                         "ERROR: unrecognised version '%s'\n",
 691                                         arg);
 692                                 usage_client();
 693                                 goto client_exit_error;
 694                         }
 695                 } else if (eqstr(arg, "-cs")) {
 696                         if (++ i >= argc) {
 697                                 fprintf(stderr,
 698                                         "ERROR: no argument for '-cs'\n");
 699                                 usage_client();
 700                                 goto client_exit_error;
 701                         }
 702                         arg = argv[i];
 703                         if (suites != NULL) {
 704                                 fprintf(stderr, "ERROR: duplicate list"
 705                                         " of cipher suites\n");
 706                                 usage_client();
 707                                 goto client_exit_error;
 708                         }
 709                         suites = parse_suites(arg, &num_suites);
 710                         if (suites == NULL) {
 711                                 usage_client();
 712                                 goto client_exit_error;
 713                         }
 714                 } else if (eqstr(arg, "-hf")) {
 715                         unsigned x;
 716
 717                         if (++ i >= argc) {
 718                                 fprintf(stderr,
 719                                         "ERROR: no argument for '-hf'\n");
 720                                 usage_client();
 721                                 goto client_exit_error;
 722                         }
 723                         arg = argv[i];
 724                         x = parse_hash_functions(arg);
 725                         if (x == 0) {
 726                                 usage_client();
 727                                 goto client_exit_error;
 728                         }
 729                         hfuns |= x;
 730                 } else if (eqstr(arg, "-minhello")) {
 731                         if (++ i >= argc) {
 732                                 fprintf(stderr,
 733                                         "ERROR: no argument for '-minhello'\n");
 734                                 usage_client();
 735                                 goto client_exit_error;
 736                         }
 737                         arg = argv[i];
 738                         if (minhello_len != (size_t)-1) {
 739                                 fprintf(stderr, "ERROR: duplicate minium"
 740                                         " ClientHello length\n");
 741                                 usage_client();
 742                                 goto client_exit_error;
 743                         }
 744                         minhello_len = parse_size(arg);
 745                         /*
 746                          * Minimum ClientHello length must fit on 16 bits.
 747                          */
 748                         if (minhello_len == (size_t)-1
 749                                 || (((minhello_len >> 12) >> 4) != 0))
 750                         {
 751                                 usage_client();
 752                                 goto client_exit_error;
 753                         }
 754                 } else if (eqstr(arg, "-fallback")) {
 755                         fallback = 1;
 756                 } else if (eqstr(arg, "-noreneg")) {
 757                         flags |= BR_OPT_NO_RENEGOTIATION;
 758                 } else if (eqstr(arg, "-alpn")) {
 759                         if (++ i >= argc) {
 760                                 fprintf(stderr,
 761                                         "ERROR: no argument for '-alpn'\n");
 762                                 usage_client();
 763                                 goto client_exit_error;
 764                         }
 765                         VEC_ADD(alpn_names, xstrdup(argv[i]));
 766                 } else if (eqstr(arg, "-strictalpn")) {
 767                         flags |= BR_OPT_FAIL_ON_ALPN_MISMATCH;
 768                 } else {
 769                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 770                         usage_client();
 771                         goto client_exit_error;
 772                 }
 773         }
 774         if (server_name == NULL) {
 775                 fprintf(stderr, "ERROR: no server name/address provided\n");
 776                 usage_client();
 777                 goto client_exit_error;
 778         }
 779         for (u = strlen(server_name); u > 0; u --) {
 780                 int c = server_name[u - 1];
 781                 if (c == ':') {
 782                         break;
 783                 }
 784                 if (c < '0' || c > '9') {
 785                         u = 0;
 786                         break;
 787                 }
 788         }
 789         if (u == 0) {
 790                 host = xstrdup(server_name);
 791                 port = xstrdup("443");
 792         } else {
 793                 port = xstrdup(server_name + u);
 794                 host = xmalloc(u);
 795                 memcpy(host, server_name, u - 1);
 796                 host[u - 1] = 0;
 797         }
 798         if (sni == NULL) {
 799                 sni = host;
 800         }
 801
 802         if (chain == NULL && sk != NULL) {
 803                 fprintf(stderr, "ERROR: private key specified, but"
 804                         " no certificate chain\n");
 805                 usage_client();
 806                 goto client_exit_error;
 807         }
 808         if (chain != NULL && sk == NULL) {
 809                 fprintf(stderr, "ERROR: certificate chain specified, but"
 810                         " no private key\n");
 811                 usage_client();
 812                 goto client_exit_error;
 813         }
 814
 815         if (vmin == 0) {
 816                 vmin = BR_TLS10;
 817         }
 818         if (vmax == 0) {
 819                 vmax = BR_TLS12;
 820         }
 821         if (vmax < vmin) {
 822                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 823                         " version combination\n");
 824                 usage_client();
 825                 goto client_exit_error;
 826         }
 827         if (suites == NULL) {
 828                 num_suites = 0;
 829
 830                 for (u = 0; cipher_suites[u].name; u ++) {
 831                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 832                                 || vmax >= BR_TLS12)
 833                         {
 834                                 num_suites ++;
 835                         }
 836                 }
 837                 suites = xmalloc(num_suites * sizeof *suites);
 838                 num_suites = 0;
 839                 for (u = 0; cipher_suites[u].name; u ++) {
 840                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 841                                 || vmax >= BR_TLS12)
 842                         {
 843                                 suites[num_suites ++] = cipher_suites[u];
 844                         }
 845                 }
 846         }
 847         if (hfuns == 0) {
 848                 hfuns = (unsigned)-1;
 849         }
 850         if (iobuf_len == 0) {
 851                 if (bidi) {
 852                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 853                 } else {
 854                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 855                 }
 856         }
 857         iobuf = xmalloc(iobuf_len);
 858
 859         /*
 860          * Compute implementation requirements and inject implementations.
 861          */
 862         suite_ids = xmalloc((num_suites + 1) * sizeof *suite_ids);
 863         br_ssl_client_zero(&cc);
 864         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 865         dnhash = NULL;
 866         for (u = 0; hash_functions[u].name; u ++) {
 867                 const br_hash_class *hc;
 868                 int id;
 869
 870                 hc = hash_functions[u].hclass;
 871                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 872                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 873                         dnhash = hc;
 874                 }
 875         }
 876         if (dnhash == NULL) {
 877                 fprintf(stderr, "ERROR: no supported hash function\n");
 878                 goto client_exit_error;
 879         }
 880         br_x509_minimal_init(&xc, dnhash,
 881                 &VEC_ELT(anchors, 0), VEC_LEN(anchors));
 882         if (vmin <= BR_TLS11) {
 883                 if (!(hfuns & (1 << br_md5_ID))) {
 884                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 885                         goto client_exit_error;
 886                 }
 887                 if (!(hfuns & (1 << br_sha1_ID))) {
 888                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 889                         goto client_exit_error;
 890                 }
 891         }
 892         for (u = 0; u < num_suites; u ++) {
 893                 unsigned req;
 894
 895                 req = suites[u].req;
 896                 suite_ids[u] = suites[u].suite;
 897                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 898                         fprintf(stderr,
 899                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 900                                 suites[u].name);
 901                         goto client_exit_error;
 902                 }
 903                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 904                         fprintf(stderr,
 905                                 "ERROR: cipher suite %s requires SHA-1\n",
 906                                 suites[u].name);
 907                         goto client_exit_error;
 908                 }
 909                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
 910                         fprintf(stderr,
 911                                 "ERROR: cipher suite %s requires SHA-256\n",
 912                                 suites[u].name);
 913                         goto client_exit_error;
 914                 }
 915                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
 916                         fprintf(stderr,
 917                                 "ERROR: cipher suite %s requires SHA-384\n",
 918                                 suites[u].name);
 919                         goto client_exit_error;
 920                 }
 921                 /* TODO: algorithm implementation selection */
 922                 if ((req & REQ_AESCBC) != 0) {
 923                         br_ssl_engine_set_aes_cbc(&cc.eng,
 924                                 &br_aes_ct_cbcenc_vtable,
 925                                 &br_aes_ct_cbcdec_vtable);
 926                         br_ssl_engine_set_cbc(&cc.eng,
 927                                 &br_sslrec_in_cbc_vtable,
 928                                 &br_sslrec_out_cbc_vtable);
 929                 }
 930                 if ((req & REQ_AESGCM) != 0) {
 931                         br_ssl_engine_set_aes_ctr(&cc.eng,
 932                                 &br_aes_ct_ctr_vtable);
 933                         br_ssl_engine_set_ghash(&cc.eng,
 934                                 &br_ghash_ctmul);
 935                         br_ssl_engine_set_gcm(&cc.eng,
 936                                 &br_sslrec_in_gcm_vtable,
 937                                 &br_sslrec_out_gcm_vtable);
 938                 }
 939                 if ((req & REQ_CHAPOL) != 0) {
 940                         br_ssl_engine_set_chacha20(&cc.eng,
 941                                 &br_chacha20_ct_run);
 942                         br_ssl_engine_set_poly1305(&cc.eng,
 943                                 &br_poly1305_ctmul_run);
 944                         br_ssl_engine_set_chapol(&cc.eng,
 945                                 &br_sslrec_in_chapol_vtable,
 946                                 &br_sslrec_out_chapol_vtable);
 947                 }
 948                 if ((req & REQ_3DESCBC) != 0) {
 949                         br_ssl_engine_set_des_cbc(&cc.eng,
 950                                 &br_des_ct_cbcenc_vtable,
 951                                 &br_des_ct_cbcdec_vtable);
 952                         br_ssl_engine_set_cbc(&cc.eng,
 953                                 &br_sslrec_in_cbc_vtable,
 954                                 &br_sslrec_out_cbc_vtable);
 955                 }
 956                 if ((req & REQ_RSAKEYX) != 0) {
 957                         br_ssl_client_set_rsapub(&cc, &br_rsa_i31_public);
 958                 }
 959                 if ((req & REQ_ECDHE_RSA) != 0) {
 960                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 961                         br_ssl_engine_set_rsavrfy(&cc.eng,
 962                                 &br_rsa_i31_pkcs1_vrfy);
 963                 }
 964                 if ((req & REQ_ECDHE_ECDSA) != 0) {
 965                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 966                         br_ssl_engine_set_ecdsa(&cc.eng,
 967                                 &br_ecdsa_i31_vrfy_asn1);
 968                 }
 969                 if ((req & REQ_ECDH) != 0) {
 970                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 971                 }
 972         }
 973         if (fallback) {
 974                 suite_ids[num_suites ++] = 0x5600;
 975         }
 976         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
 977
 978         for (u = 0; hash_functions[u].name; u ++) {
 979                 const br_hash_class *hc;
 980                 int id;
 981
 982                 hc = hash_functions[u].hclass;
 983                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 984                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 985                         br_ssl_engine_set_hash(&cc.eng, id, hc);
 986                         br_x509_minimal_set_hash(&xc, id, hc);
 987                 }
 988         }
 989         if (vmin <= BR_TLS11) {
 990                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
 991         }
 992         if (vmax >= BR_TLS12) {
 993                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
 994                         br_ssl_engine_set_prf_sha256(&cc.eng,
 995                                 &br_tls12_sha256_prf);
 996                 }
 997                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
 998                         br_ssl_engine_set_prf_sha384(&cc.eng,
 999                                 &br_tls12_sha384_prf);
1000                 }
1001         }
1002         br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
1003         br_x509_minimal_set_ecdsa(&xc,
1004                 &br_ec_prime_i31, &br_ecdsa_i31_vrfy_asn1);
1005
1006         /*
1007          * If there is no provided trust anchor, then certificate validation
1008          * will always fail. In that situation, we use our custom wrapper
1009          * that tolerates unknown anchors.
1010          */
1011         if (VEC_LEN(anchors) == 0) {
1012                 if (verbose) {
1013                         fprintf(stderr,
1014                                 "WARNING: no configured trust anchor\n");
1015                 }
1016                 x509_noanchor_init(&xwc, &xc.vtable);
1017                 br_ssl_engine_set_x509(&cc.eng, &xwc.vtable);
1018         } else {
1019                 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
1020         }
1021
1022         if (minhello_len != (size_t)-1) {
1023                 br_ssl_client_set_min_clienthello_len(&cc, minhello_len);
1024         }
1025         br_ssl_engine_set_all_flags(&cc.eng, flags);
1026         if (VEC_LEN(alpn_names) != 0) {
1027                 br_ssl_engine_set_protocol_names(&cc.eng,
1028                         &VEC_ELT(alpn_names, 0), VEC_LEN(alpn_names));
1029         }
1030
1031         if (chain != NULL) {
1032                 zc.vtable = &ccert_vtable;
1033                 zc.verbose = verbose;
1034                 zc.chain = chain;
1035                 zc.chain_len = chain_len;
1036                 zc.sk = sk;
1037                 if (nostaticecdh || sk->key_type != BR_KEYTYPE_EC) {
1038                         zc.issuer_key_type = 0;
1039                 } else {
1040                         zc.issuer_key_type = get_cert_signer_algo(&chain[0]);
1041                         if (zc.issuer_key_type == 0) {
1042                                 goto client_exit_error;
1043                         }
1044                 }
1045                 br_ssl_client_set_client_certificate(&cc, &zc.vtable);
1046         }
1047
1048         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
1049         br_ssl_client_reset(&cc, sni, 0);
1050
1051         /*
1052          * We need to avoid SIGPIPE.
1053          */
1054         signal(SIGPIPE, SIG_IGN);
1055
1056         /*
1057          * Connect to the peer.
1058          */
1059         fd = host_connect(host, port, verbose);
1060         if (fd < 0) {
1061                 goto client_exit_error;
1062         }
1063
1064         /*
1065          * Run the engine until completion.
1066          */
1067         if (run_ssl_engine(&cc.eng, fd,
1068                 (verbose ? RUN_ENGINE_VERBOSE : 0)
1069                 | (trace ? RUN_ENGINE_TRACE : 0)) != 0)
1070         {
1071                 goto client_exit_error;
1072         } else {
1073                 goto client_exit;
1074         }
1075
1076         /*
1077          * Release allocated structures.
1078          */
1079 client_exit:
1080         xfree(host);
1081         xfree(port);
1082         xfree(suites);
1083         xfree(suite_ids);
1084         VEC_CLEAREXT(anchors, &free_ta_contents);
1085         VEC_CLEAREXT(alpn_names, &free_alpn);
1086         free_certificates(chain, chain_len);
1087         free_private_key(sk);
1088         xfree(iobuf);
1089         if (fd >= 0) {
1090                 close(fd);
1091         }
1092         return retcode;
1093
1094 client_exit_error:
1095         retcode = -1;
1096         goto client_exit;
1097 }