_ Git - BearSSL/blob - tools/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         size_t xoff, xlen;
 326         uint32_t r;
 327
 328         zc = (ccert_context *)pctx;
 329         r = br_ec_all_m15.mul(data, *len, zc->sk->key.ec.x,
 330                 zc->sk->key.ec.xlen, zc->sk->key.ec.curve);
 331         xoff = br_ec_all_m15.xoff(zc->sk->key.ec.curve, &xlen);
 332         memmove(data, data + xoff, xlen);
 333         *len = xlen;
 334         return r;
 335 }
 336
 337 static size_t
 338 cc_do_sign(const br_ssl_client_certificate_class **pctx,
 339         int hash_id, size_t hv_len, unsigned char *data, size_t len)
 340 {
 341         ccert_context *zc;
 342         unsigned char hv[64];
 343
 344         zc = (ccert_context *)pctx;
 345         memcpy(hv, data, hv_len);
 346         switch (zc->sk->key_type) {
 347                 const br_hash_class *hc;
 348                 const unsigned char *hash_oid;
 349                 uint32_t x;
 350                 size_t sig_len;
 351
 352         case BR_KEYTYPE_RSA:
 353                 hash_oid = get_hash_oid(hash_id);
 354                 if (hash_oid == NULL && hash_id != 0) {
 355                         if (zc->verbose) {
 356                                 fprintf(stderr, "ERROR: cannot RSA-sign with"
 357                                         " unknown hash function: %d\n",
 358                                         hash_id);
 359                         }
 360                         return 0;
 361                 }
 362                 sig_len = (zc->sk->key.rsa.n_bitlen + 7) >> 3;
 363                 if (len < sig_len) {
 364                         if (zc->verbose) {
 365                                 fprintf(stderr, "ERROR: cannot RSA-sign,"
 366                                         " buffer is too small"
 367                                         " (sig=%lu, buf=%lu)\n",
 368                                         (unsigned long)sig_len,
 369                                         (unsigned long)len);
 370                         }
 371                         return 0;
 372                 }
 373                 x = br_rsa_i31_pkcs1_sign(hash_oid, hv, hv_len,
 374                         &zc->sk->key.rsa, data);
 375                 if (!x) {
 376                         if (zc->verbose) {
 377                                 fprintf(stderr, "ERROR: RSA-sign failure\n");
 378                         }
 379                         return 0;
 380                 }
 381                 return sig_len;
 382
 383         case BR_KEYTYPE_EC:
 384                 hc = get_hash_impl(hash_id);
 385                 if (hc == NULL) {
 386                         if (zc->verbose) {
 387                                 fprintf(stderr, "ERROR: cannot ECDSA-sign with"
 388                                         " unknown hash function: %d\n",
 389                                         hash_id);
 390                         }
 391                         return 0;
 392                 }
 393                 if (len < 139) {
 394                         if (zc->verbose) {
 395                                 fprintf(stderr, "ERROR: cannot ECDSA-sign"
 396                                         " (output buffer = %lu)\n",
 397                                         (unsigned long)len);
 398                         }
 399                         return 0;
 400                 }
 401                 sig_len = br_ecdsa_i31_sign_asn1(&br_ec_all_m15,
 402                         hc, hv, &zc->sk->key.ec, data);
 403                 if (sig_len == 0) {
 404                         if (zc->verbose) {
 405                                 fprintf(stderr, "ERROR: ECDSA-sign failure\n");
 406                         }
 407                         return 0;
 408                 }
 409                 return sig_len;
 410
 411         default:
 412                 return 0;
 413         }
 414 }
 415
 416 static const br_ssl_client_certificate_class ccert_vtable = {
 417         sizeof(ccert_context),
 418         cc_start_name_list,
 419         cc_start_name,
 420         cc_append_name,
 421         cc_end_name,
 422         cc_end_name_list,
 423         cc_choose,
 424         cc_do_keyx,
 425         cc_do_sign
 426 };
 427
 428 static void
 429 free_alpn(void *alpn)
 430 {
 431         xfree(*(char **)alpn);
 432 }
 433
 434 static void
 435 usage_client(void)
 436 {
 437         fprintf(stderr,
 438 "usage: brssl client server[:port] [ options ]\n");
 439         fprintf(stderr,
 440 "options:\n");
 441         fprintf(stderr,
 442 "   -q              suppress verbose messages\n");
 443         fprintf(stderr,
 444 "   -trace          activate extra debug messages (dump of all packets)\n");
 445         fprintf(stderr,
 446 "   -sni name       use this specific name for SNI\n");
 447         fprintf(stderr,
 448 "   -nosni          do not send any SNI\n");
 449         fprintf(stderr,
 450 "   -mono           use monodirectional buffering\n");
 451         fprintf(stderr,
 452 "   -buf length     set the I/O buffer length (in bytes)\n");
 453         fprintf(stderr,
 454 "   -CA file        add certificates in 'file' to trust anchors\n");
 455         fprintf(stderr,
 456 "   -cert file      set client certificate chain\n");
 457         fprintf(stderr,
 458 "   -key file       set client private key (for certificate authentication)\n");
 459         fprintf(stderr,
 460 "   -nostaticecdh   prohibit full-static ECDH (client certificate)\n");
 461         fprintf(stderr,
 462 "   -list           list supported names (protocols, algorithms...)\n");
 463         fprintf(stderr,
 464 "   -vmin name      set minimum supported version (default: TLS-1.0)\n");
 465         fprintf(stderr,
 466 "   -vmax name      set maximum supported version (default: TLS-1.2)\n");
 467         fprintf(stderr,
 468 "   -cs names       set list of supported cipher suites (comma-separated)\n");
 469         fprintf(stderr,
 470 "   -hf names       add support for some hash functions (comma-separated)\n");
 471         fprintf(stderr,
 472 "   -minhello len   set minimum ClientHello length (in bytes)\n");
 473         fprintf(stderr,
 474 "   -fallback       send the TLS_FALLBACK_SCSV (i.e. claim a downgrade)\n");
 475         fprintf(stderr,
 476 "   -noreneg        prohibit renegotiations\n");
 477         fprintf(stderr,
 478 "   -alpn name      add protocol name to list of protocols (ALPN extension)\n");
 479         fprintf(stderr,
 480 "   -strictalpn     fail on ALPN mismatch\n");
 481 }
 482
 483 /* see brssl.h */
 484 int
 485 do_client(int argc, char *argv[])
 486 {
 487         int retcode;
 488         int verbose;
 489         int trace;
 490         int i, bidi;
 491         const char *server_name;
 492         char *host;
 493         char *port;
 494         const char *sni;
 495         anchor_list anchors = VEC_INIT;
 496         unsigned vmin, vmax;
 497         VECTOR(const char *) alpn_names = VEC_INIT;
 498         cipher_suite *suites;
 499         size_t num_suites;
 500         uint16_t *suite_ids;
 501         unsigned hfuns;
 502         size_t u;
 503         br_ssl_client_context cc;
 504         br_x509_minimal_context xc;
 505         x509_noanchor_context xwc;
 506         const br_hash_class *dnhash;
 507         ccert_context zc;
 508         br_x509_certificate *chain;
 509         size_t chain_len;
 510         private_key *sk;
 511         int nostaticecdh;
 512         unsigned char *iobuf;
 513         size_t iobuf_len;
 514         size_t minhello_len;
 515         int fallback;
 516         uint32_t flags;
 517         int fd;
 518
 519         retcode = 0;
 520         verbose = 1;
 521         trace = 0;
 522         server_name = NULL;
 523         host = NULL;
 524         port = NULL;
 525         sni = NULL;
 526         bidi = 1;
 527         vmin = 0;
 528         vmax = 0;
 529         suites = NULL;
 530         num_suites = 0;
 531         hfuns = 0;
 532         suite_ids = NULL;
 533         chain = NULL;
 534         chain_len = 0;
 535         sk = NULL;
 536         nostaticecdh = 0;
 537         iobuf = NULL;
 538         iobuf_len = 0;
 539         minhello_len = (size_t)-1;
 540         fallback = 0;
 541         flags = 0;
 542         fd = -1;
 543         for (i = 0; i < argc; i ++) {
 544                 const char *arg;
 545
 546                 arg = argv[i];
 547                 if (arg[0] != '-') {
 548                         if (server_name != NULL) {
 549                                 fprintf(stderr,
 550                                         "ERROR: duplicate server name\n");
 551                                 usage_client();
 552                                 goto client_exit_error;
 553                         }
 554                         server_name = arg;
 555                         continue;
 556                 }
 557                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 558                         verbose = 1;
 559                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 560                         verbose = 0;
 561                 } else if (eqstr(arg, "-trace")) {
 562                         trace = 1;
 563                 } else if (eqstr(arg, "-sni")) {
 564                         if (++ i >= argc) {
 565                                 fprintf(stderr,
 566                                         "ERROR: no argument for '-sni'\n");
 567                                 usage_client();
 568                                 goto client_exit_error;
 569                         }
 570                         if (sni != NULL) {
 571                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 572                                 usage_client();
 573                                 goto client_exit_error;
 574                         }
 575                         sni = argv[i];
 576                 } else if (eqstr(arg, "-nosni")) {
 577                         if (sni != NULL) {
 578                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 579                                 usage_client();
 580                                 goto client_exit_error;
 581                         }
 582                         sni = "";
 583                 } else if (eqstr(arg, "-mono")) {
 584                         bidi = 0;
 585                 } else if (eqstr(arg, "-buf")) {
 586                         if (++ i >= argc) {
 587                                 fprintf(stderr,
 588                                         "ERROR: no argument for '-buf'\n");
 589                                 usage_client();
 590                                 goto client_exit_error;
 591                         }
 592                         arg = argv[i];
 593                         if (iobuf_len != 0) {
 594                                 fprintf(stderr,
 595                                         "ERROR: duplicate I/O buffer length\n");
 596                                 usage_client();
 597                                 goto client_exit_error;
 598                         }
 599                         iobuf_len = parse_size(arg);
 600                         if (iobuf_len == (size_t)-1) {
 601                                 usage_client();
 602                                 goto client_exit_error;
 603                         }
 604                 } else if (eqstr(arg, "-CA")) {
 605                         if (++ i >= argc) {
 606                                 fprintf(stderr,
 607                                         "ERROR: no argument for '-CA'\n");
 608                                 usage_client();
 609                                 goto client_exit_error;
 610                         }
 611                         arg = argv[i];
 612                         if (read_trust_anchors(&anchors, arg) == 0) {
 613                                 usage_client();
 614                                 goto client_exit_error;
 615                         }
 616                 } else if (eqstr(arg, "-cert")) {
 617                         if (++ i >= argc) {
 618                                 fprintf(stderr,
 619                                         "ERROR: no argument for '-cert'\n");
 620                                 usage_client();
 621                                 goto client_exit_error;
 622                         }
 623                         if (chain != NULL) {
 624                                 fprintf(stderr,
 625                                         "ERROR: duplicate certificate chain\n");
 626                                 usage_client();
 627                                 goto client_exit_error;
 628                         }
 629                         arg = argv[i];
 630                         chain = read_certificates(arg, &chain_len);
 631                         if (chain == NULL || chain_len == 0) {
 632                                 goto client_exit_error;
 633                         }
 634                 } else if (eqstr(arg, "-key")) {
 635                         if (++ i >= argc) {
 636                                 fprintf(stderr,
 637                                         "ERROR: no argument for '-key'\n");
 638                                 usage_client();
 639                                 goto client_exit_error;
 640                         }
 641                         if (sk != NULL) {
 642                                 fprintf(stderr,
 643                                         "ERROR: duplicate private key\n");
 644                                 usage_client();
 645                                 goto client_exit_error;
 646                         }
 647                         arg = argv[i];
 648                         sk = read_private_key(arg);
 649                         if (sk == NULL) {
 650                                 goto client_exit_error;
 651                         }
 652                 } else if (eqstr(arg, "-nostaticecdh")) {
 653                         nostaticecdh = 1;
 654                 } else if (eqstr(arg, "-list")) {
 655                         list_names();
 656                         goto client_exit;
 657                 } else if (eqstr(arg, "-vmin")) {
 658                         if (++ i >= argc) {
 659                                 fprintf(stderr,
 660                                         "ERROR: no argument for '-vmin'\n");
 661                                 usage_client();
 662                                 goto client_exit_error;
 663                         }
 664                         arg = argv[i];
 665                         if (vmin != 0) {
 666                                 fprintf(stderr,
 667                                         "ERROR: duplicate minimum version\n");
 668                                 usage_client();
 669                                 goto client_exit_error;
 670                         }
 671                         vmin = parse_version(arg, strlen(arg));
 672                         if (vmin == 0) {
 673                                 fprintf(stderr,
 674                                         "ERROR: unrecognised version '%s'\n",
 675                                         arg);
 676                                 usage_client();
 677                                 goto client_exit_error;
 678                         }
 679                 } else if (eqstr(arg, "-vmax")) {
 680                         if (++ i >= argc) {
 681                                 fprintf(stderr,
 682                                         "ERROR: no argument for '-vmax'\n");
 683                                 usage_client();
 684                                 goto client_exit_error;
 685                         }
 686                         arg = argv[i];
 687                         if (vmax != 0) {
 688                                 fprintf(stderr,
 689                                         "ERROR: duplicate maximum version\n");
 690                                 usage_client();
 691                                 goto client_exit_error;
 692                         }
 693                         vmax = parse_version(arg, strlen(arg));
 694                         if (vmax == 0) {
 695                                 fprintf(stderr,
 696                                         "ERROR: unrecognised version '%s'\n",
 697                                         arg);
 698                                 usage_client();
 699                                 goto client_exit_error;
 700                         }
 701                 } else if (eqstr(arg, "-cs")) {
 702                         if (++ i >= argc) {
 703                                 fprintf(stderr,
 704                                         "ERROR: no argument for '-cs'\n");
 705                                 usage_client();
 706                                 goto client_exit_error;
 707                         }
 708                         arg = argv[i];
 709                         if (suites != NULL) {
 710                                 fprintf(stderr, "ERROR: duplicate list"
 711                                         " of cipher suites\n");
 712                                 usage_client();
 713                                 goto client_exit_error;
 714                         }
 715                         suites = parse_suites(arg, &num_suites);
 716                         if (suites == NULL) {
 717                                 usage_client();
 718                                 goto client_exit_error;
 719                         }
 720                 } else if (eqstr(arg, "-hf")) {
 721                         unsigned x;
 722
 723                         if (++ i >= argc) {
 724                                 fprintf(stderr,
 725                                         "ERROR: no argument for '-hf'\n");
 726                                 usage_client();
 727                                 goto client_exit_error;
 728                         }
 729                         arg = argv[i];
 730                         x = parse_hash_functions(arg);
 731                         if (x == 0) {
 732                                 usage_client();
 733                                 goto client_exit_error;
 734                         }
 735                         hfuns |= x;
 736                 } else if (eqstr(arg, "-minhello")) {
 737                         if (++ i >= argc) {
 738                                 fprintf(stderr,
 739                                         "ERROR: no argument for '-minhello'\n");
 740                                 usage_client();
 741                                 goto client_exit_error;
 742                         }
 743                         arg = argv[i];
 744                         if (minhello_len != (size_t)-1) {
 745                                 fprintf(stderr, "ERROR: duplicate minium"
 746                                         " ClientHello length\n");
 747                                 usage_client();
 748                                 goto client_exit_error;
 749                         }
 750                         minhello_len = parse_size(arg);
 751                         /*
 752                          * Minimum ClientHello length must fit on 16 bits.
 753                          */
 754                         if (minhello_len == (size_t)-1
 755                                 || (((minhello_len >> 12) >> 4) != 0))
 756                         {
 757                                 usage_client();
 758                                 goto client_exit_error;
 759                         }
 760                 } else if (eqstr(arg, "-fallback")) {
 761                         fallback = 1;
 762                 } else if (eqstr(arg, "-noreneg")) {
 763                         flags |= BR_OPT_NO_RENEGOTIATION;
 764                 } else if (eqstr(arg, "-alpn")) {
 765                         if (++ i >= argc) {
 766                                 fprintf(stderr,
 767                                         "ERROR: no argument for '-alpn'\n");
 768                                 usage_client();
 769                                 goto client_exit_error;
 770                         }
 771                         VEC_ADD(alpn_names, xstrdup(argv[i]));
 772                 } else if (eqstr(arg, "-strictalpn")) {
 773                         flags |= BR_OPT_FAIL_ON_ALPN_MISMATCH;
 774                 } else {
 775                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 776                         usage_client();
 777                         goto client_exit_error;
 778                 }
 779         }
 780         if (server_name == NULL) {
 781                 fprintf(stderr, "ERROR: no server name/address provided\n");
 782                 usage_client();
 783                 goto client_exit_error;
 784         }
 785         for (u = strlen(server_name); u > 0; u --) {
 786                 int c = server_name[u - 1];
 787                 if (c == ':') {
 788                         break;
 789                 }
 790                 if (c < '0' || c > '9') {
 791                         u = 0;
 792                         break;
 793                 }
 794         }
 795         if (u == 0) {
 796                 host = xstrdup(server_name);
 797                 port = xstrdup("443");
 798         } else {
 799                 port = xstrdup(server_name + u);
 800                 host = xmalloc(u);
 801                 memcpy(host, server_name, u - 1);
 802                 host[u - 1] = 0;
 803         }
 804         if (sni == NULL) {
 805                 sni = host;
 806         }
 807
 808         if (chain == NULL && sk != NULL) {
 809                 fprintf(stderr, "ERROR: private key specified, but"
 810                         " no certificate chain\n");
 811                 usage_client();
 812                 goto client_exit_error;
 813         }
 814         if (chain != NULL && sk == NULL) {
 815                 fprintf(stderr, "ERROR: certificate chain specified, but"
 816                         " no private key\n");
 817                 usage_client();
 818                 goto client_exit_error;
 819         }
 820
 821         if (vmin == 0) {
 822                 vmin = BR_TLS10;
 823         }
 824         if (vmax == 0) {
 825                 vmax = BR_TLS12;
 826         }
 827         if (vmax < vmin) {
 828                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 829                         " version combination\n");
 830                 usage_client();
 831                 goto client_exit_error;
 832         }
 833         if (suites == NULL) {
 834                 num_suites = 0;
 835
 836                 for (u = 0; cipher_suites[u].name; u ++) {
 837                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 838                                 || vmax >= BR_TLS12)
 839                         {
 840                                 num_suites ++;
 841                         }
 842                 }
 843                 suites = xmalloc(num_suites * sizeof *suites);
 844                 num_suites = 0;
 845                 for (u = 0; cipher_suites[u].name; u ++) {
 846                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 847                                 || vmax >= BR_TLS12)
 848                         {
 849                                 suites[num_suites ++] = cipher_suites[u];
 850                         }
 851                 }
 852         }
 853         if (hfuns == 0) {
 854                 hfuns = (unsigned)-1;
 855         }
 856         if (iobuf_len == 0) {
 857                 if (bidi) {
 858                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 859                 } else {
 860                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 861                 }
 862         }
 863         iobuf = xmalloc(iobuf_len);
 864
 865         /*
 866          * Compute implementation requirements and inject implementations.
 867          */
 868         suite_ids = xmalloc((num_suites + 1) * sizeof *suite_ids);
 869         br_ssl_client_zero(&cc);
 870         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 871         dnhash = NULL;
 872         for (u = 0; hash_functions[u].name; u ++) {
 873                 const br_hash_class *hc;
 874                 int id;
 875
 876                 hc = hash_functions[u].hclass;
 877                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 878                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 879                         dnhash = hc;
 880                 }
 881         }
 882         if (dnhash == NULL) {
 883                 fprintf(stderr, "ERROR: no supported hash function\n");
 884                 goto client_exit_error;
 885         }
 886         br_x509_minimal_init(&xc, dnhash,
 887                 &VEC_ELT(anchors, 0), VEC_LEN(anchors));
 888         if (vmin <= BR_TLS11) {
 889                 if (!(hfuns & (1 << br_md5_ID))) {
 890                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 891                         goto client_exit_error;
 892                 }
 893                 if (!(hfuns & (1 << br_sha1_ID))) {
 894                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 895                         goto client_exit_error;
 896                 }
 897         }
 898         for (u = 0; u < num_suites; u ++) {
 899                 unsigned req;
 900
 901                 req = suites[u].req;
 902                 suite_ids[u] = suites[u].suite;
 903                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 904                         fprintf(stderr,
 905                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 906                                 suites[u].name);
 907                         goto client_exit_error;
 908                 }
 909                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 910                         fprintf(stderr,
 911                                 "ERROR: cipher suite %s requires SHA-1\n",
 912                                 suites[u].name);
 913                         goto client_exit_error;
 914                 }
 915                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
 916                         fprintf(stderr,
 917                                 "ERROR: cipher suite %s requires SHA-256\n",
 918                                 suites[u].name);
 919                         goto client_exit_error;
 920                 }
 921                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
 922                         fprintf(stderr,
 923                                 "ERROR: cipher suite %s requires SHA-384\n",
 924                                 suites[u].name);
 925                         goto client_exit_error;
 926                 }
 927                 /* TODO: algorithm implementation selection */
 928                 if ((req & REQ_AESCBC) != 0) {
 929                         br_ssl_engine_set_aes_cbc(&cc.eng,
 930                                 &br_aes_ct_cbcenc_vtable,
 931                                 &br_aes_ct_cbcdec_vtable);
 932                         br_ssl_engine_set_cbc(&cc.eng,
 933                                 &br_sslrec_in_cbc_vtable,
 934                                 &br_sslrec_out_cbc_vtable);
 935                 }
 936                 if ((req & REQ_AESGCM) != 0) {
 937                         br_ssl_engine_set_aes_ctr(&cc.eng,
 938                                 &br_aes_ct_ctr_vtable);
 939                         br_ssl_engine_set_ghash(&cc.eng,
 940                                 &br_ghash_ctmul);
 941                         br_ssl_engine_set_gcm(&cc.eng,
 942                                 &br_sslrec_in_gcm_vtable,
 943                                 &br_sslrec_out_gcm_vtable);
 944                 }
 945                 if ((req & REQ_CHAPOL) != 0) {
 946                         br_ssl_engine_set_chacha20(&cc.eng,
 947                                 &br_chacha20_ct_run);
 948                         br_ssl_engine_set_poly1305(&cc.eng,
 949                                 &br_poly1305_ctmul_run);
 950                         br_ssl_engine_set_chapol(&cc.eng,
 951                                 &br_sslrec_in_chapol_vtable,
 952                                 &br_sslrec_out_chapol_vtable);
 953                 }
 954                 if ((req & REQ_3DESCBC) != 0) {
 955                         br_ssl_engine_set_des_cbc(&cc.eng,
 956                                 &br_des_ct_cbcenc_vtable,
 957                                 &br_des_ct_cbcdec_vtable);
 958                         br_ssl_engine_set_cbc(&cc.eng,
 959                                 &br_sslrec_in_cbc_vtable,
 960                                 &br_sslrec_out_cbc_vtable);
 961                 }
 962                 if ((req & REQ_RSAKEYX) != 0) {
 963                         br_ssl_client_set_rsapub(&cc, &br_rsa_i31_public);
 964                 }
 965                 if ((req & REQ_ECDHE_RSA) != 0) {
 966                         br_ssl_engine_set_ec(&cc.eng, &br_ec_all_m15);
 967                         br_ssl_engine_set_rsavrfy(&cc.eng,
 968                                 &br_rsa_i31_pkcs1_vrfy);
 969                 }
 970                 if ((req & REQ_ECDHE_ECDSA) != 0) {
 971                         br_ssl_engine_set_ec(&cc.eng, &br_ec_all_m15);
 972                         br_ssl_engine_set_ecdsa(&cc.eng,
 973                                 &br_ecdsa_i31_vrfy_asn1);
 974                 }
 975                 if ((req & REQ_ECDH) != 0) {
 976                         br_ssl_engine_set_ec(&cc.eng, &br_ec_all_m15);
 977                 }
 978         }
 979         if (fallback) {
 980                 suite_ids[num_suites ++] = 0x5600;
 981         }
 982         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
 983
 984         for (u = 0; hash_functions[u].name; u ++) {
 985                 const br_hash_class *hc;
 986                 int id;
 987
 988                 hc = hash_functions[u].hclass;
 989                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 990                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 991                         br_ssl_engine_set_hash(&cc.eng, id, hc);
 992                         br_x509_minimal_set_hash(&xc, id, hc);
 993                 }
 994         }
 995         if (vmin <= BR_TLS11) {
 996                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
 997         }
 998         if (vmax >= BR_TLS12) {
 999                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
1000                         br_ssl_engine_set_prf_sha256(&cc.eng,
1001                                 &br_tls12_sha256_prf);
1002                 }
1003                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
1004                         br_ssl_engine_set_prf_sha384(&cc.eng,
1005                                 &br_tls12_sha384_prf);
1006                 }
1007         }
1008         br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
1009         br_x509_minimal_set_ecdsa(&xc,
1010                 &br_ec_all_m15, &br_ecdsa_i31_vrfy_asn1);
1011
1012         /*
1013          * If there is no provided trust anchor, then certificate validation
1014          * will always fail. In that situation, we use our custom wrapper
1015          * that tolerates unknown anchors.
1016          */
1017         if (VEC_LEN(anchors) == 0) {
1018                 if (verbose) {
1019                         fprintf(stderr,
1020                                 "WARNING: no configured trust anchor\n");
1021                 }
1022                 x509_noanchor_init(&xwc, &xc.vtable);
1023                 br_ssl_engine_set_x509(&cc.eng, &xwc.vtable);
1024         } else {
1025                 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
1026         }
1027
1028         if (minhello_len != (size_t)-1) {
1029                 br_ssl_client_set_min_clienthello_len(&cc, minhello_len);
1030         }
1031         br_ssl_engine_set_all_flags(&cc.eng, flags);
1032         if (VEC_LEN(alpn_names) != 0) {
1033                 br_ssl_engine_set_protocol_names(&cc.eng,
1034                         &VEC_ELT(alpn_names, 0), VEC_LEN(alpn_names));
1035         }
1036
1037         if (chain != NULL) {
1038                 zc.vtable = &ccert_vtable;
1039                 zc.verbose = verbose;
1040                 zc.chain = chain;
1041                 zc.chain_len = chain_len;
1042                 zc.sk = sk;
1043                 if (nostaticecdh || sk->key_type != BR_KEYTYPE_EC) {
1044                         zc.issuer_key_type = 0;
1045                 } else {
1046                         zc.issuer_key_type = get_cert_signer_algo(&chain[0]);
1047                         if (zc.issuer_key_type == 0) {
1048                                 goto client_exit_error;
1049                         }
1050                 }
1051                 br_ssl_client_set_client_certificate(&cc, &zc.vtable);
1052         }
1053
1054         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
1055         br_ssl_client_reset(&cc, sni, 0);
1056
1057         /*
1058          * We need to avoid SIGPIPE.
1059          */
1060         signal(SIGPIPE, SIG_IGN);
1061
1062         /*
1063          * Connect to the peer.
1064          */
1065         fd = host_connect(host, port, verbose);
1066         if (fd < 0) {
1067                 goto client_exit_error;
1068         }
1069
1070         /*
1071          * Run the engine until completion.
1072          */
1073         if (run_ssl_engine(&cc.eng, fd,
1074                 (verbose ? RUN_ENGINE_VERBOSE : 0)
1075                 | (trace ? RUN_ENGINE_TRACE : 0)) != 0)
1076         {
1077                 goto client_exit_error;
1078         } else {
1079                 goto client_exit;
1080         }
1081
1082         /*
1083          * Release allocated structures.
1084          */
1085 client_exit:
1086         xfree(host);
1087         xfree(port);
1088         xfree(suites);
1089         xfree(suite_ids);
1090         VEC_CLEAREXT(anchors, &free_ta_contents);
1091         VEC_CLEAREXT(alpn_names, &free_alpn);
1092         free_certificates(chain, chain_len);
1093         free_private_key(sk);
1094         xfree(iobuf);
1095         if (fd >= 0) {
1096                 close(fd);
1097         }
1098         return retcode;
1099
1100 client_exit_error:
1101         retcode = -1;
1102         goto client_exit;
1103 }