_ 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 #ifdef _WIN32
  33 #include <winsock2.h>
  34 #include <ws2tcpip.h>
  35 #else
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <netdb.h>
  39 #include <netinet/in.h>
  40 #include <arpa/inet.h>
  41 #include <unistd.h>
  42 #include <fcntl.h>
  43
  44 #define SOCKET             int
  45 #define INVALID_SOCKET     (-1)
  46 #endif
  47
  48 #include "brssl.h"
  49
  50 static int
  51 host_connect(const char *host, const char *port, int verbose)
  52 {
  53         struct addrinfo hints, *si, *p;
  54         SOCKET fd;
  55         int err;
  56
  57         memset(&hints, 0, sizeof hints);
  58         hints.ai_family = PF_UNSPEC;
  59         hints.ai_socktype = SOCK_STREAM;
  60         err = getaddrinfo(host, port, &hints, &si);
  61         if (err != 0) {
  62                 fprintf(stderr, "ERROR: getaddrinfo(): %s\n",
  63                         gai_strerror(err));
  64                 return INVALID_SOCKET;
  65         }
  66         fd = INVALID_SOCKET;
  67         for (p = si; p != NULL; p = p->ai_next) {
  68                 if (verbose) {
  69                         struct sockaddr *sa;
  70                         void *addr;
  71                         char tmp[INET6_ADDRSTRLEN + 50];
  72
  73                         sa = (struct sockaddr *)p->ai_addr;
  74                         if (sa->sa_family == AF_INET) {
  75                                 addr = &((struct sockaddr_in *)sa)->sin_addr;
  76                         } else if (sa->sa_family == AF_INET6) {
  77                                 addr = &((struct sockaddr_in6 *)sa)->sin6_addr;
  78                         } else {
  79                                 addr = NULL;
  80                         }
  81                         if (addr != NULL) {
  82                                 if (!inet_ntop(p->ai_family, addr,
  83                                         tmp, sizeof tmp))
  84                                 {
  85                                         strcpy(tmp, "<invalid>");
  86                                 }
  87                         } else {
  88                                 sprintf(tmp, "<unknown family: %d>",
  89                                         (int)sa->sa_family);
  90                         }
  91                         fprintf(stderr, "connecting to: %s\n", tmp);
  92                 }
  93                 fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
  94                 if (fd == INVALID_SOCKET) {
  95                         if (verbose) {
  96                                 perror("socket()");
  97                         }
  98                         continue;
  99                 }
 100                 if (connect(fd, p->ai_addr, p->ai_addrlen) == INVALID_SOCKET) {
 101                         if (verbose) {
 102                                 perror("connect()");
 103                         }
 104 #ifdef _WIN32
 105                         closesocket(fd);
 106 #else
 107                         close(fd);
 108 #endif
 109                         continue;
 110                 }
 111                 break;
 112         }
 113         if (p == NULL) {
 114                 freeaddrinfo(si);
 115                 fprintf(stderr, "ERROR: failed to connect\n");
 116                 return INVALID_SOCKET;
 117         }
 118         freeaddrinfo(si);
 119         if (verbose) {
 120                 fprintf(stderr, "connected.\n");
 121         }
 122
 123         /*
 124          * We make the socket non-blocking, since we are going to use
 125          * poll() or select() to organise I/O.
 126          */
 127 #ifdef _WIN32
 128         {
 129                 u_long arg;
 130
 131                 arg = 1;
 132                 ioctlsocket(fd, FIONBIO, &arg);
 133         }
 134 #else
 135         fcntl(fd, F_SETFL, O_NONBLOCK);
 136 #endif
 137         return fd;
 138 }
 139
 140 typedef struct {
 141         const br_ssl_client_certificate_class *vtable;
 142         int verbose;
 143         br_x509_certificate *chain;
 144         size_t chain_len;
 145         private_key *sk;
 146         int issuer_key_type;
 147 } ccert_context;
 148
 149 static void
 150 cc_start_name_list(const br_ssl_client_certificate_class **pctx)
 151 {
 152         ccert_context *zc;
 153
 154         zc = (ccert_context *)pctx;
 155         if (zc->verbose) {
 156                 fprintf(stderr, "Server requests a client certificate.\n");
 157                 fprintf(stderr, "--- anchor DN list start ---\n");
 158         }
 159 }
 160
 161 static void
 162 cc_start_name(const br_ssl_client_certificate_class **pctx, size_t len)
 163 {
 164         ccert_context *zc;
 165
 166         zc = (ccert_context *)pctx;
 167         if (zc->verbose) {
 168                 fprintf(stderr, "new anchor name, length = %u\n",
 169                         (unsigned)len);
 170         }
 171 }
 172
 173 static void
 174 cc_append_name(const br_ssl_client_certificate_class **pctx,
 175         const unsigned char *data, size_t len)
 176 {
 177         ccert_context *zc;
 178
 179         zc = (ccert_context *)pctx;
 180         if (zc->verbose) {
 181                 size_t u;
 182
 183                 for (u = 0; u < len; u ++) {
 184                         if (u == 0) {
 185                                 fprintf(stderr, "  ");
 186                         } else if (u > 0 && u % 16 == 0) {
 187                                 fprintf(stderr, "\n  ");
 188                         }
 189                         fprintf(stderr, " %02x", data[u]);
 190                 }
 191                 if (len > 0) {
 192                         fprintf(stderr, "\n");
 193                 }
 194         }
 195 }
 196
 197 static void
 198 cc_end_name(const br_ssl_client_certificate_class **pctx)
 199 {
 200         (void)pctx;
 201 }
 202
 203 static void
 204 cc_end_name_list(const br_ssl_client_certificate_class **pctx)
 205 {
 206         ccert_context *zc;
 207
 208         zc = (ccert_context *)pctx;
 209         if (zc->verbose) {
 210                 fprintf(stderr, "--- anchor DN list end ---\n");
 211         }
 212 }
 213
 214 static void
 215 print_hashes(unsigned hh, unsigned hh2)
 216 {
 217         int i;
 218
 219         for (i = 0; i < 8; i ++) {
 220                 const char *name;
 221
 222                 name = hash_function_name(i);
 223                 if (((hh >> i) & 1) != 0) {
 224                         fprintf(stderr, " %s", name);
 225                 } else if (((hh2 >> i) & 1) != 0) {
 226                         fprintf(stderr, " (%s)", name);
 227                 }
 228         }
 229 }
 230
 231 static int
 232 choose_hash(unsigned hh)
 233 {
 234         static const int f[] = {
 235                 br_sha256_ID, br_sha224_ID, br_sha384_ID, br_sha512_ID,
 236                 br_sha1_ID, br_md5sha1_ID, -1
 237         };
 238
 239         size_t u;
 240
 241         for (u = 0; f[u] >= 0; u ++) {
 242                 if (((hh >> f[u]) & 1) != 0) {
 243                         return f[u];
 244                 }
 245         }
 246         return -1;
 247 }
 248
 249 static void
 250 cc_choose(const br_ssl_client_certificate_class **pctx,
 251         const br_ssl_client_context *cc, uint32_t auth_types,
 252         br_ssl_client_certificate *choices)
 253 {
 254         ccert_context *zc;
 255         int scurve;
 256
 257         zc = (ccert_context *)pctx;
 258         scurve = br_ssl_client_get_server_curve(cc);
 259         if (zc->verbose) {
 260                 unsigned hashes;
 261
 262                 hashes = br_ssl_client_get_server_hashes(cc);
 263                 if ((auth_types & 0x00FF) != 0) {
 264                         fprintf(stderr, "supported: RSA signatures:");
 265                         print_hashes(auth_types, hashes);
 266                         fprintf(stderr, "\n");
 267                 }
 268                 if ((auth_types & 0xFF00) != 0) {
 269                         fprintf(stderr, "supported: ECDSA signatures:");
 270                         print_hashes(auth_types >> 8, hashes >> 8);
 271                         fprintf(stderr, "\n");
 272                 }
 273                 if ((auth_types & 0x010000) != 0) {
 274                         fprintf(stderr, "supported:"
 275                                 " fixed ECDH (cert signed with RSA)\n");
 276                 }
 277                 if ((auth_types & 0x020000) != 0) {
 278                         fprintf(stderr, "supported:"
 279                                 " fixed ECDH (cert signed with ECDSA)\n");
 280                 }
 281                 if (scurve) {
 282                         fprintf(stderr, "server key curve: %s (%d)\n",
 283                                 ec_curve_name(scurve), scurve);
 284                 } else {
 285                         fprintf(stderr, "server key is not EC\n");
 286                 }
 287         }
 288         switch (zc->sk->key_type) {
 289         case BR_KEYTYPE_RSA:
 290                 if ((choices->hash_id = choose_hash(auth_types)) >= 0) {
 291                         if (zc->verbose) {
 292                                 fprintf(stderr, "using RSA, hash = %d (%s)\n",
 293                                         choices->hash_id,
 294                                         hash_function_name(choices->hash_id));
 295                         }
 296                         choices->auth_type = BR_AUTH_RSA;
 297                         choices->chain = zc->chain;
 298                         choices->chain_len = zc->chain_len;
 299                         return;
 300                 }
 301                 break;
 302         case BR_KEYTYPE_EC:
 303                 if (zc->issuer_key_type != 0
 304                         && scurve == zc->sk->key.ec.curve)
 305                 {
 306                         int x;
 307
 308                         x = (zc->issuer_key_type == BR_KEYTYPE_RSA) ? 16 : 17;
 309                         if (((auth_types >> x) & 1) != 0) {
 310                                 if (zc->verbose) {
 311                                         fprintf(stderr, "using static ECDH\n");
 312                                 }
 313                                 choices->auth_type = BR_AUTH_ECDH;
 314                                 choices->hash_id = -1;
 315                                 choices->chain = zc->chain;
 316                                 choices->chain_len = zc->chain_len;
 317                                 return;
 318                         }
 319                 }
 320                 if ((choices->hash_id = choose_hash(auth_types >> 8)) >= 0) {
 321                         if (zc->verbose) {
 322                                 fprintf(stderr, "using ECDSA, hash = %d (%s)\n",
 323                                         choices->hash_id,
 324                                         hash_function_name(choices->hash_id));
 325                         }
 326                         choices->auth_type = BR_AUTH_ECDSA;
 327                         choices->chain = zc->chain;
 328                         choices->chain_len = zc->chain_len;
 329                         return;
 330                 }
 331                 break;
 332         }
 333         if (zc->verbose) {
 334                 fprintf(stderr, "no matching client certificate\n");
 335         }
 336         choices->chain = NULL;
 337         choices->chain_len = 0;
 338 }
 339
 340 static uint32_t
 341 cc_do_keyx(const br_ssl_client_certificate_class **pctx,
 342         unsigned char *data, size_t *len)
 343 {
 344         ccert_context *zc;
 345         size_t xoff, xlen;
 346         uint32_t r;
 347
 348         zc = (ccert_context *)pctx;
 349         r = br_ec_all_m15.mul(data, *len, zc->sk->key.ec.x,
 350                 zc->sk->key.ec.xlen, zc->sk->key.ec.curve);
 351         xoff = br_ec_all_m15.xoff(zc->sk->key.ec.curve, &xlen);
 352         memmove(data, data + xoff, xlen);
 353         *len = xlen;
 354         return r;
 355 }
 356
 357 static size_t
 358 cc_do_sign(const br_ssl_client_certificate_class **pctx,
 359         int hash_id, size_t hv_len, unsigned char *data, size_t len)
 360 {
 361         ccert_context *zc;
 362         unsigned char hv[64];
 363
 364         zc = (ccert_context *)pctx;
 365         memcpy(hv, data, hv_len);
 366         switch (zc->sk->key_type) {
 367                 const br_hash_class *hc;
 368                 const unsigned char *hash_oid;
 369                 uint32_t x;
 370                 size_t sig_len;
 371
 372         case BR_KEYTYPE_RSA:
 373                 hash_oid = get_hash_oid(hash_id);
 374                 if (hash_oid == NULL && hash_id != 0) {
 375                         if (zc->verbose) {
 376                                 fprintf(stderr, "ERROR: cannot RSA-sign with"
 377                                         " unknown hash function: %d\n",
 378                                         hash_id);
 379                         }
 380                         return 0;
 381                 }
 382                 sig_len = (zc->sk->key.rsa.n_bitlen + 7) >> 3;
 383                 if (len < sig_len) {
 384                         if (zc->verbose) {
 385                                 fprintf(stderr, "ERROR: cannot RSA-sign,"
 386                                         " buffer is too small"
 387                                         " (sig=%lu, buf=%lu)\n",
 388                                         (unsigned long)sig_len,
 389                                         (unsigned long)len);
 390                         }
 391                         return 0;
 392                 }
 393                 x = br_rsa_i31_pkcs1_sign(hash_oid, hv, hv_len,
 394                         &zc->sk->key.rsa, data);
 395                 if (!x) {
 396                         if (zc->verbose) {
 397                                 fprintf(stderr, "ERROR: RSA-sign failure\n");
 398                         }
 399                         return 0;
 400                 }
 401                 return sig_len;
 402
 403         case BR_KEYTYPE_EC:
 404                 hc = get_hash_impl(hash_id);
 405                 if (hc == NULL) {
 406                         if (zc->verbose) {
 407                                 fprintf(stderr, "ERROR: cannot ECDSA-sign with"
 408                                         " unknown hash function: %d\n",
 409                                         hash_id);
 410                         }
 411                         return 0;
 412                 }
 413                 if (len < 139) {
 414                         if (zc->verbose) {
 415                                 fprintf(stderr, "ERROR: cannot ECDSA-sign"
 416                                         " (output buffer = %lu)\n",
 417                                         (unsigned long)len);
 418                         }
 419                         return 0;
 420                 }
 421                 sig_len = br_ecdsa_i31_sign_asn1(&br_ec_all_m15,
 422                         hc, hv, &zc->sk->key.ec, data);
 423                 if (sig_len == 0) {
 424                         if (zc->verbose) {
 425                                 fprintf(stderr, "ERROR: ECDSA-sign failure\n");
 426                         }
 427                         return 0;
 428                 }
 429                 return sig_len;
 430
 431         default:
 432                 return 0;
 433         }
 434 }
 435
 436 static const br_ssl_client_certificate_class ccert_vtable = {
 437         sizeof(ccert_context),
 438         cc_start_name_list,
 439         cc_start_name,
 440         cc_append_name,
 441         cc_end_name,
 442         cc_end_name_list,
 443         cc_choose,
 444         cc_do_keyx,
 445         cc_do_sign
 446 };
 447
 448 static void
 449 free_alpn(void *alpn)
 450 {
 451         xfree(*(char **)alpn);
 452 }
 453
 454 static void
 455 usage_client(void)
 456 {
 457         fprintf(stderr,
 458 "usage: brssl client server[:port] [ options ]\n");
 459         fprintf(stderr,
 460 "options:\n");
 461         fprintf(stderr,
 462 "   -q              suppress verbose messages\n");
 463         fprintf(stderr,
 464 "   -trace          activate extra debug messages (dump of all packets)\n");
 465         fprintf(stderr,
 466 "   -sni name       use this specific name for SNI\n");
 467         fprintf(stderr,
 468 "   -nosni          do not send any SNI\n");
 469         fprintf(stderr,
 470 "   -mono           use monodirectional buffering\n");
 471         fprintf(stderr,
 472 "   -buf length     set the I/O buffer length (in bytes)\n");
 473         fprintf(stderr,
 474 "   -CA file        add certificates in 'file' to trust anchors\n");
 475         fprintf(stderr,
 476 "   -cert file      set client certificate chain\n");
 477         fprintf(stderr,
 478 "   -key file       set client private key (for certificate authentication)\n");
 479         fprintf(stderr,
 480 "   -nostaticecdh   prohibit full-static ECDH (client certificate)\n");
 481         fprintf(stderr,
 482 "   -list           list supported names (protocols, algorithms...)\n");
 483         fprintf(stderr,
 484 "   -vmin name      set minimum supported version (default: TLS-1.0)\n");
 485         fprintf(stderr,
 486 "   -vmax name      set maximum supported version (default: TLS-1.2)\n");
 487         fprintf(stderr,
 488 "   -cs names       set list of supported cipher suites (comma-separated)\n");
 489         fprintf(stderr,
 490 "   -hf names       add support for some hash functions (comma-separated)\n");
 491         fprintf(stderr,
 492 "   -minhello len   set minimum ClientHello length (in bytes)\n");
 493         fprintf(stderr,
 494 "   -fallback       send the TLS_FALLBACK_SCSV (i.e. claim a downgrade)\n");
 495         fprintf(stderr,
 496 "   -noreneg        prohibit renegotiations\n");
 497         fprintf(stderr,
 498 "   -alpn name      add protocol name to list of protocols (ALPN extension)\n");
 499         fprintf(stderr,
 500 "   -strictalpn     fail on ALPN mismatch\n");
 501 }
 502
 503 /* see brssl.h */
 504 int
 505 do_client(int argc, char *argv[])
 506 {
 507         int retcode;
 508         int verbose;
 509         int trace;
 510         int i, bidi;
 511         const char *server_name;
 512         char *host;
 513         char *port;
 514         const char *sni;
 515         anchor_list anchors = VEC_INIT;
 516         unsigned vmin, vmax;
 517         VECTOR(char *) alpn_names = VEC_INIT;
 518         cipher_suite *suites;
 519         size_t num_suites;
 520         uint16_t *suite_ids;
 521         unsigned hfuns;
 522         size_t u;
 523         br_ssl_client_context cc;
 524         br_x509_minimal_context xc;
 525         x509_noanchor_context xwc;
 526         const br_hash_class *dnhash;
 527         ccert_context zc;
 528         br_x509_certificate *chain;
 529         size_t chain_len;
 530         private_key *sk;
 531         int nostaticecdh;
 532         unsigned char *iobuf;
 533         size_t iobuf_len;
 534         size_t minhello_len;
 535         int fallback;
 536         uint32_t flags;
 537         SOCKET fd;
 538
 539         retcode = 0;
 540         verbose = 1;
 541         trace = 0;
 542         server_name = NULL;
 543         host = NULL;
 544         port = NULL;
 545         sni = NULL;
 546         bidi = 1;
 547         vmin = 0;
 548         vmax = 0;
 549         suites = NULL;
 550         num_suites = 0;
 551         hfuns = 0;
 552         suite_ids = NULL;
 553         chain = NULL;
 554         chain_len = 0;
 555         sk = NULL;
 556         nostaticecdh = 0;
 557         iobuf = NULL;
 558         iobuf_len = 0;
 559         minhello_len = (size_t)-1;
 560         fallback = 0;
 561         flags = 0;
 562         fd = INVALID_SOCKET;
 563         for (i = 0; i < argc; i ++) {
 564                 const char *arg;
 565
 566                 arg = argv[i];
 567                 if (arg[0] != '-') {
 568                         if (server_name != NULL) {
 569                                 fprintf(stderr,
 570                                         "ERROR: duplicate server name\n");
 571                                 usage_client();
 572                                 goto client_exit_error;
 573                         }
 574                         server_name = arg;
 575                         continue;
 576                 }
 577                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 578                         verbose = 1;
 579                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 580                         verbose = 0;
 581                 } else if (eqstr(arg, "-trace")) {
 582                         trace = 1;
 583                 } else if (eqstr(arg, "-sni")) {
 584                         if (++ i >= argc) {
 585                                 fprintf(stderr,
 586                                         "ERROR: no argument for '-sni'\n");
 587                                 usage_client();
 588                                 goto client_exit_error;
 589                         }
 590                         if (sni != NULL) {
 591                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 592                                 usage_client();
 593                                 goto client_exit_error;
 594                         }
 595                         sni = argv[i];
 596                 } else if (eqstr(arg, "-nosni")) {
 597                         if (sni != NULL) {
 598                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 599                                 usage_client();
 600                                 goto client_exit_error;
 601                         }
 602                         sni = "";
 603                 } else if (eqstr(arg, "-mono")) {
 604                         bidi = 0;
 605                 } else if (eqstr(arg, "-buf")) {
 606                         if (++ i >= argc) {
 607                                 fprintf(stderr,
 608                                         "ERROR: no argument for '-buf'\n");
 609                                 usage_client();
 610                                 goto client_exit_error;
 611                         }
 612                         arg = argv[i];
 613                         if (iobuf_len != 0) {
 614                                 fprintf(stderr,
 615                                         "ERROR: duplicate I/O buffer length\n");
 616                                 usage_client();
 617                                 goto client_exit_error;
 618                         }
 619                         iobuf_len = parse_size(arg);
 620                         if (iobuf_len == (size_t)-1) {
 621                                 usage_client();
 622                                 goto client_exit_error;
 623                         }
 624                 } else if (eqstr(arg, "-CA")) {
 625                         if (++ i >= argc) {
 626                                 fprintf(stderr,
 627                                         "ERROR: no argument for '-CA'\n");
 628                                 usage_client();
 629                                 goto client_exit_error;
 630                         }
 631                         arg = argv[i];
 632                         if (read_trust_anchors(&anchors, arg) == 0) {
 633                                 usage_client();
 634                                 goto client_exit_error;
 635                         }
 636                 } else if (eqstr(arg, "-cert")) {
 637                         if (++ i >= argc) {
 638                                 fprintf(stderr,
 639                                         "ERROR: no argument for '-cert'\n");
 640                                 usage_client();
 641                                 goto client_exit_error;
 642                         }
 643                         if (chain != NULL) {
 644                                 fprintf(stderr,
 645                                         "ERROR: duplicate certificate chain\n");
 646                                 usage_client();
 647                                 goto client_exit_error;
 648                         }
 649                         arg = argv[i];
 650                         chain = read_certificates(arg, &chain_len);
 651                         if (chain == NULL || chain_len == 0) {
 652                                 goto client_exit_error;
 653                         }
 654                 } else if (eqstr(arg, "-key")) {
 655                         if (++ i >= argc) {
 656                                 fprintf(stderr,
 657                                         "ERROR: no argument for '-key'\n");
 658                                 usage_client();
 659                                 goto client_exit_error;
 660                         }
 661                         if (sk != NULL) {
 662                                 fprintf(stderr,
 663                                         "ERROR: duplicate private key\n");
 664                                 usage_client();
 665                                 goto client_exit_error;
 666                         }
 667                         arg = argv[i];
 668                         sk = read_private_key(arg);
 669                         if (sk == NULL) {
 670                                 goto client_exit_error;
 671                         }
 672                 } else if (eqstr(arg, "-nostaticecdh")) {
 673                         nostaticecdh = 1;
 674                 } else if (eqstr(arg, "-list")) {
 675                         list_names();
 676                         goto client_exit;
 677                 } else if (eqstr(arg, "-vmin")) {
 678                         if (++ i >= argc) {
 679                                 fprintf(stderr,
 680                                         "ERROR: no argument for '-vmin'\n");
 681                                 usage_client();
 682                                 goto client_exit_error;
 683                         }
 684                         arg = argv[i];
 685                         if (vmin != 0) {
 686                                 fprintf(stderr,
 687                                         "ERROR: duplicate minimum version\n");
 688                                 usage_client();
 689                                 goto client_exit_error;
 690                         }
 691                         vmin = parse_version(arg, strlen(arg));
 692                         if (vmin == 0) {
 693                                 fprintf(stderr,
 694                                         "ERROR: unrecognised version '%s'\n",
 695                                         arg);
 696                                 usage_client();
 697                                 goto client_exit_error;
 698                         }
 699                 } else if (eqstr(arg, "-vmax")) {
 700                         if (++ i >= argc) {
 701                                 fprintf(stderr,
 702                                         "ERROR: no argument for '-vmax'\n");
 703                                 usage_client();
 704                                 goto client_exit_error;
 705                         }
 706                         arg = argv[i];
 707                         if (vmax != 0) {
 708                                 fprintf(stderr,
 709                                         "ERROR: duplicate maximum version\n");
 710                                 usage_client();
 711                                 goto client_exit_error;
 712                         }
 713                         vmax = parse_version(arg, strlen(arg));
 714                         if (vmax == 0) {
 715                                 fprintf(stderr,
 716                                         "ERROR: unrecognised version '%s'\n",
 717                                         arg);
 718                                 usage_client();
 719                                 goto client_exit_error;
 720                         }
 721                 } else if (eqstr(arg, "-cs")) {
 722                         if (++ i >= argc) {
 723                                 fprintf(stderr,
 724                                         "ERROR: no argument for '-cs'\n");
 725                                 usage_client();
 726                                 goto client_exit_error;
 727                         }
 728                         arg = argv[i];
 729                         if (suites != NULL) {
 730                                 fprintf(stderr, "ERROR: duplicate list"
 731                                         " of cipher suites\n");
 732                                 usage_client();
 733                                 goto client_exit_error;
 734                         }
 735                         suites = parse_suites(arg, &num_suites);
 736                         if (suites == NULL) {
 737                                 usage_client();
 738                                 goto client_exit_error;
 739                         }
 740                 } else if (eqstr(arg, "-hf")) {
 741                         unsigned x;
 742
 743                         if (++ i >= argc) {
 744                                 fprintf(stderr,
 745                                         "ERROR: no argument for '-hf'\n");
 746                                 usage_client();
 747                                 goto client_exit_error;
 748                         }
 749                         arg = argv[i];
 750                         x = parse_hash_functions(arg);
 751                         if (x == 0) {
 752                                 usage_client();
 753                                 goto client_exit_error;
 754                         }
 755                         hfuns |= x;
 756                 } else if (eqstr(arg, "-minhello")) {
 757                         if (++ i >= argc) {
 758                                 fprintf(stderr,
 759                                         "ERROR: no argument for '-minhello'\n");
 760                                 usage_client();
 761                                 goto client_exit_error;
 762                         }
 763                         arg = argv[i];
 764                         if (minhello_len != (size_t)-1) {
 765                                 fprintf(stderr, "ERROR: duplicate minium"
 766                                         " ClientHello length\n");
 767                                 usage_client();
 768                                 goto client_exit_error;
 769                         }
 770                         minhello_len = parse_size(arg);
 771                         /*
 772                          * Minimum ClientHello length must fit on 16 bits.
 773                          */
 774                         if (minhello_len == (size_t)-1
 775                                 || (((minhello_len >> 12) >> 4) != 0))
 776                         {
 777                                 usage_client();
 778                                 goto client_exit_error;
 779                         }
 780                 } else if (eqstr(arg, "-fallback")) {
 781                         fallback = 1;
 782                 } else if (eqstr(arg, "-noreneg")) {
 783                         flags |= BR_OPT_NO_RENEGOTIATION;
 784                 } else if (eqstr(arg, "-alpn")) {
 785                         if (++ i >= argc) {
 786                                 fprintf(stderr,
 787                                         "ERROR: no argument for '-alpn'\n");
 788                                 usage_client();
 789                                 goto client_exit_error;
 790                         }
 791                         VEC_ADD(alpn_names, xstrdup(argv[i]));
 792                 } else if (eqstr(arg, "-strictalpn")) {
 793                         flags |= BR_OPT_FAIL_ON_ALPN_MISMATCH;
 794                 } else {
 795                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 796                         usage_client();
 797                         goto client_exit_error;
 798                 }
 799         }
 800         if (server_name == NULL) {
 801                 fprintf(stderr, "ERROR: no server name/address provided\n");
 802                 usage_client();
 803                 goto client_exit_error;
 804         }
 805         for (u = strlen(server_name); u > 0; u --) {
 806                 int c = server_name[u - 1];
 807                 if (c == ':') {
 808                         break;
 809                 }
 810                 if (c < '0' || c > '9') {
 811                         u = 0;
 812                         break;
 813                 }
 814         }
 815         if (u == 0) {
 816                 host = xstrdup(server_name);
 817                 port = xstrdup("443");
 818         } else {
 819                 port = xstrdup(server_name + u);
 820                 host = xmalloc(u);
 821                 memcpy(host, server_name, u - 1);
 822                 host[u - 1] = 0;
 823         }
 824         if (sni == NULL) {
 825                 sni = host;
 826         }
 827
 828         if (chain == NULL && sk != NULL) {
 829                 fprintf(stderr, "ERROR: private key specified, but"
 830                         " no certificate chain\n");
 831                 usage_client();
 832                 goto client_exit_error;
 833         }
 834         if (chain != NULL && sk == NULL) {
 835                 fprintf(stderr, "ERROR: certificate chain specified, but"
 836                         " no private key\n");
 837                 usage_client();
 838                 goto client_exit_error;
 839         }
 840
 841         if (vmin == 0) {
 842                 vmin = BR_TLS10;
 843         }
 844         if (vmax == 0) {
 845                 vmax = BR_TLS12;
 846         }
 847         if (vmax < vmin) {
 848                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 849                         " version combination\n");
 850                 usage_client();
 851                 goto client_exit_error;
 852         }
 853         if (suites == NULL) {
 854                 num_suites = 0;
 855
 856                 for (u = 0; cipher_suites[u].name; u ++) {
 857                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 858                                 || vmax >= BR_TLS12)
 859                         {
 860                                 num_suites ++;
 861                         }
 862                 }
 863                 suites = xmalloc(num_suites * sizeof *suites);
 864                 num_suites = 0;
 865                 for (u = 0; cipher_suites[u].name; u ++) {
 866                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 867                                 || vmax >= BR_TLS12)
 868                         {
 869                                 suites[num_suites ++] = cipher_suites[u];
 870                         }
 871                 }
 872         }
 873         if (hfuns == 0) {
 874                 hfuns = (unsigned)-1;
 875         }
 876         if (iobuf_len == 0) {
 877                 if (bidi) {
 878                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 879                 } else {
 880                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 881                 }
 882         }
 883         iobuf = xmalloc(iobuf_len);
 884
 885         /*
 886          * Compute implementation requirements and inject implementations.
 887          */
 888         suite_ids = xmalloc((num_suites + 1) * sizeof *suite_ids);
 889         br_ssl_client_zero(&cc);
 890         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 891         dnhash = NULL;
 892         for (u = 0; hash_functions[u].name; u ++) {
 893                 const br_hash_class *hc;
 894                 int id;
 895
 896                 hc = hash_functions[u].hclass;
 897                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 898                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 899                         dnhash = hc;
 900                 }
 901         }
 902         if (dnhash == NULL) {
 903                 fprintf(stderr, "ERROR: no supported hash function\n");
 904                 goto client_exit_error;
 905         }
 906         br_x509_minimal_init(&xc, dnhash,
 907                 &VEC_ELT(anchors, 0), VEC_LEN(anchors));
 908         if (vmin <= BR_TLS11) {
 909                 if (!(hfuns & (1 << br_md5_ID))) {
 910                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 911                         goto client_exit_error;
 912                 }
 913                 if (!(hfuns & (1 << br_sha1_ID))) {
 914                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 915                         goto client_exit_error;
 916                 }
 917         }
 918         for (u = 0; u < num_suites; u ++) {
 919                 unsigned req;
 920
 921                 req = suites[u].req;
 922                 suite_ids[u] = suites[u].suite;
 923                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 924                         fprintf(stderr,
 925                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 926                                 suites[u].name);
 927                         goto client_exit_error;
 928                 }
 929                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 930                         fprintf(stderr,
 931                                 "ERROR: cipher suite %s requires SHA-1\n",
 932                                 suites[u].name);
 933                         goto client_exit_error;
 934                 }
 935                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
 936                         fprintf(stderr,
 937                                 "ERROR: cipher suite %s requires SHA-256\n",
 938                                 suites[u].name);
 939                         goto client_exit_error;
 940                 }
 941                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
 942                         fprintf(stderr,
 943                                 "ERROR: cipher suite %s requires SHA-384\n",
 944                                 suites[u].name);
 945                         goto client_exit_error;
 946                 }
 947                 /* TODO: algorithm implementation selection */
 948                 if ((req & REQ_AESCBC) != 0) {
 949                         br_ssl_engine_set_aes_cbc(&cc.eng,
 950                                 &br_aes_ct_cbcenc_vtable,
 951                                 &br_aes_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_AESGCM) != 0) {
 957                         br_ssl_engine_set_aes_ctr(&cc.eng,
 958                                 &br_aes_ct_ctr_vtable);
 959                         br_ssl_engine_set_ghash(&cc.eng,
 960                                 &br_ghash_ctmul);
 961                         br_ssl_engine_set_gcm(&cc.eng,
 962                                 &br_sslrec_in_gcm_vtable,
 963                                 &br_sslrec_out_gcm_vtable);
 964                 }
 965                 if ((req & REQ_CHAPOL) != 0) {
 966                         br_ssl_engine_set_chacha20(&cc.eng,
 967                                 &br_chacha20_ct_run);
 968                         br_ssl_engine_set_poly1305(&cc.eng,
 969                                 &br_poly1305_ctmul_run);
 970                         br_ssl_engine_set_chapol(&cc.eng,
 971                                 &br_sslrec_in_chapol_vtable,
 972                                 &br_sslrec_out_chapol_vtable);
 973                 }
 974                 if ((req & REQ_3DESCBC) != 0) {
 975                         br_ssl_engine_set_des_cbc(&cc.eng,
 976                                 &br_des_ct_cbcenc_vtable,
 977                                 &br_des_ct_cbcdec_vtable);
 978                         br_ssl_engine_set_cbc(&cc.eng,
 979                                 &br_sslrec_in_cbc_vtable,
 980                                 &br_sslrec_out_cbc_vtable);
 981                 }
 982                 if ((req & REQ_RSAKEYX) != 0) {
 983                         br_ssl_client_set_rsapub(&cc, &br_rsa_i31_public);
 984                 }
 985                 if ((req & REQ_ECDHE_RSA) != 0) {
 986                         br_ssl_engine_set_ec(&cc.eng, &br_ec_all_m15);
 987                         br_ssl_engine_set_rsavrfy(&cc.eng,
 988                                 &br_rsa_i31_pkcs1_vrfy);
 989                 }
 990                 if ((req & REQ_ECDHE_ECDSA) != 0) {
 991                         br_ssl_engine_set_ec(&cc.eng, &br_ec_all_m15);
 992                         br_ssl_engine_set_ecdsa(&cc.eng,
 993                                 &br_ecdsa_i31_vrfy_asn1);
 994                 }
 995                 if ((req & REQ_ECDH) != 0) {
 996                         br_ssl_engine_set_ec(&cc.eng, &br_ec_all_m15);
 997                 }
 998         }
 999         if (fallback) {
1000                 suite_ids[num_suites ++] = 0x5600;
1001         }
1002         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
1003
1004         for (u = 0; hash_functions[u].name; u ++) {
1005                 const br_hash_class *hc;
1006                 int id;
1007
1008                 hc = hash_functions[u].hclass;
1009                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
1010                 if ((hfuns & ((unsigned)1 << id)) != 0) {
1011                         br_ssl_engine_set_hash(&cc.eng, id, hc);
1012                         br_x509_minimal_set_hash(&xc, id, hc);
1013                 }
1014         }
1015         if (vmin <= BR_TLS11) {
1016                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
1017         }
1018         if (vmax >= BR_TLS12) {
1019                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
1020                         br_ssl_engine_set_prf_sha256(&cc.eng,
1021                                 &br_tls12_sha256_prf);
1022                 }
1023                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
1024                         br_ssl_engine_set_prf_sha384(&cc.eng,
1025                                 &br_tls12_sha384_prf);
1026                 }
1027         }
1028         br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
1029         br_x509_minimal_set_ecdsa(&xc,
1030                 &br_ec_all_m15, &br_ecdsa_i31_vrfy_asn1);
1031
1032         /*
1033          * If there is no provided trust anchor, then certificate validation
1034          * will always fail. In that situation, we use our custom wrapper
1035          * that tolerates unknown anchors.
1036          */
1037         if (VEC_LEN(anchors) == 0) {
1038                 if (verbose) {
1039                         fprintf(stderr,
1040                                 "WARNING: no configured trust anchor\n");
1041                 }
1042                 x509_noanchor_init(&xwc, &xc.vtable);
1043                 br_ssl_engine_set_x509(&cc.eng, &xwc.vtable);
1044         } else {
1045                 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
1046         }
1047
1048         if (minhello_len != (size_t)-1) {
1049                 br_ssl_client_set_min_clienthello_len(&cc, minhello_len);
1050         }
1051         br_ssl_engine_set_all_flags(&cc.eng, flags);
1052         if (VEC_LEN(alpn_names) != 0) {
1053                 br_ssl_engine_set_protocol_names(&cc.eng,
1054                         (const char **)&VEC_ELT(alpn_names, 0),
1055                         VEC_LEN(alpn_names));
1056         }
1057
1058         if (chain != NULL) {
1059                 zc.vtable = &ccert_vtable;
1060                 zc.verbose = verbose;
1061                 zc.chain = chain;
1062                 zc.chain_len = chain_len;
1063                 zc.sk = sk;
1064                 if (nostaticecdh || sk->key_type != BR_KEYTYPE_EC) {
1065                         zc.issuer_key_type = 0;
1066                 } else {
1067                         zc.issuer_key_type = get_cert_signer_algo(&chain[0]);
1068                         if (zc.issuer_key_type == 0) {
1069                                 goto client_exit_error;
1070                         }
1071                 }
1072                 br_ssl_client_set_client_certificate(&cc, &zc.vtable);
1073         }
1074
1075         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
1076         br_ssl_client_reset(&cc, sni, 0);
1077
1078         /*
1079          * On Unix systems, we need to avoid SIGPIPE.
1080          */
1081 #ifndef _WIN32
1082         signal(SIGPIPE, SIG_IGN);
1083 #endif
1084
1085         /*
1086          * Connect to the peer.
1087          */
1088         fd = host_connect(host, port, verbose);
1089         if (fd == INVALID_SOCKET) {
1090                 goto client_exit_error;
1091         }
1092
1093         /*
1094          * Run the engine until completion.
1095          */
1096         if (run_ssl_engine(&cc.eng, fd,
1097                 (verbose ? RUN_ENGINE_VERBOSE : 0)
1098                 | (trace ? RUN_ENGINE_TRACE : 0)) != 0)
1099         {
1100                 goto client_exit_error;
1101         } else {
1102                 goto client_exit;
1103         }
1104
1105         /*
1106          * Release allocated structures.
1107          */
1108 client_exit:
1109         xfree(host);
1110         xfree(port);
1111         xfree(suites);
1112         xfree(suite_ids);
1113         VEC_CLEAREXT(anchors, &free_ta_contents);
1114         VEC_CLEAREXT(alpn_names, &free_alpn);
1115         free_certificates(chain, chain_len);
1116         free_private_key(sk);
1117         xfree(iobuf);
1118         if (fd != INVALID_SOCKET) {
1119 #ifdef _WIN32
1120                 closesocket(fd);
1121 #else
1122                 close(fd);
1123 #endif
1124         }
1125         return retcode;
1126
1127 client_exit_error:
1128         retcode = -1;
1129         goto client_exit;
1130 }