_ 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
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <netdb.h>
  34 #include <netinet/in.h>
  35 #include <arpa/inet.h>
  36 #include <unistd.h>
  37 #include <fcntl.h>
  38
  39 #include "brssl.h"
  40 #include "bearssl.h"
  41
  42 static int
  43 host_connect(const char *host, const char *port, int verbose)
  44 {
  45         struct addrinfo hints, *si, *p;
  46         int fd;
  47         int err;
  48
  49         memset(&hints, 0, sizeof hints);
  50         hints.ai_family = PF_UNSPEC;
  51         hints.ai_socktype = SOCK_STREAM;
  52         err = getaddrinfo(host, port, &hints, &si);
  53         if (err != 0) {
  54                 fprintf(stderr, "ERROR: getaddrinfo(): %s\n",
  55                         gai_strerror(err));
  56                 return -1;
  57         }
  58         fd = -1;
  59         for (p = si; p != NULL; p = p->ai_next) {
  60                 struct sockaddr *sa;
  61                 void *addr;
  62                 char tmp[INET6_ADDRSTRLEN + 50];
  63
  64                 sa = (struct sockaddr *)p->ai_addr;
  65                 if (sa->sa_family == AF_INET) {
  66                         addr = &((struct sockaddr_in *)sa)->sin_addr;
  67                 } else if (sa->sa_family == AF_INET6) {
  68                         addr = &((struct sockaddr_in6 *)sa)->sin6_addr;
  69                 } else {
  70                         addr = NULL;
  71                 }
  72                 if (addr != NULL) {
  73                         inet_ntop(p->ai_family, addr, tmp, sizeof tmp);
  74                 } else {
  75                         sprintf(tmp, "<unknown family: %d>",
  76                                 (int)sa->sa_family);
  77                 }
  78                 if (verbose) {
  79                         fprintf(stderr, "connecting to: %s\n", tmp);
  80                 }
  81                 fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
  82                 if (fd < 0) {
  83                         if (verbose) {
  84                                 perror("socket()");
  85                         }
  86                         continue;
  87                 }
  88                 if (connect(fd, p->ai_addr, p->ai_addrlen) < 0) {
  89                         if (verbose) {
  90                                 perror("connect()");
  91                         }
  92                         close(fd);
  93                         continue;
  94                 }
  95                 break;
  96         }
  97         if (p == NULL) {
  98                 freeaddrinfo(si);
  99                 fprintf(stderr, "ERROR: failed to connect\n");
 100                 return -1;
 101         }
 102         freeaddrinfo(si);
 103         if (verbose) {
 104                 fprintf(stderr, "connected.\n");
 105         }
 106
 107         /*
 108          * We make the socket non-blocking, since we are going to use
 109          * poll() to organise I/O.
 110          */
 111         fcntl(fd, F_SETFL, O_NONBLOCK);
 112         return fd;
 113 }
 114
 115 static void
 116 usage_client(void)
 117 {
 118         fprintf(stderr,
 119 "usage: brssl client server[:port] [ options ]\n");
 120         fprintf(stderr,
 121 "options:\n");
 122         fprintf(stderr,
 123 "   -q            suppress verbose messages\n");
 124         fprintf(stderr,
 125 "   -trace        activate extra debug messages (dump of all packets)\n");
 126         fprintf(stderr,
 127 "   -sni name     use this specific name for SNI\n");
 128         fprintf(stderr,
 129 "   -nosni        do not send any SNI\n");
 130         fprintf(stderr,
 131 "   -mono         use monodirectional buffering\n");
 132         fprintf(stderr,
 133 "   -buf length   set the I/O buffer length (in bytes)\n");
 134         fprintf(stderr,
 135 "   -CA file      add certificates in 'file' to trust anchors\n");
 136         fprintf(stderr,
 137 "   -list         list supported names (protocols, algorithms...)\n");
 138         fprintf(stderr,
 139 "   -vmin name    set minimum supported version (default: TLS-1.0)\n");
 140         fprintf(stderr,
 141 "   -vmax name    set maximum supported version (default: TLS-1.2)\n");
 142         fprintf(stderr,
 143 "   -cs names     set list of supported cipher suites (comma-separated)\n");
 144         fprintf(stderr,
 145 "   -hf names     add support for some hash functions (comma-separated)\n");
 146 }
 147
 148 /* see brssl.h */
 149 int
 150 do_client(int argc, char *argv[])
 151 {
 152         int retcode;
 153         int verbose;
 154         int trace;
 155         int i, bidi;
 156         const char *server_name;
 157         char *host;
 158         char *port;
 159         const char *sni;
 160         anchor_list anchors = VEC_INIT;
 161         unsigned vmin, vmax;
 162         cipher_suite *suites;
 163         size_t num_suites;
 164         uint16_t *suite_ids;
 165         unsigned hfuns;
 166         size_t u;
 167         br_ssl_client_context cc;
 168         br_x509_minimal_context xc;
 169         x509_noanchor_context xwc;
 170         const br_hash_class *dnhash;
 171         unsigned char *iobuf;
 172         size_t iobuf_len;
 173         int fd;
 174
 175         retcode = 0;
 176         verbose = 1;
 177         trace = 0;
 178         server_name = NULL;
 179         host = NULL;
 180         port = NULL;
 181         sni = NULL;
 182         bidi = 1;
 183         vmin = 0;
 184         vmax = 0;
 185         suites = NULL;
 186         num_suites = 0;
 187         hfuns = 0;
 188         suite_ids = NULL;
 189         iobuf = NULL;
 190         iobuf_len = 0;
 191         fd = -1;
 192         for (i = 0; i < argc; i ++) {
 193                 const char *arg;
 194
 195                 arg = argv[i];
 196                 if (arg[0] != '-') {
 197                         if (server_name != NULL) {
 198                                 fprintf(stderr,
 199                                         "ERROR: duplicate server name\n");
 200                                 usage_client();
 201                                 goto client_exit_error;
 202                         }
 203                         server_name = arg;
 204                         continue;
 205                 }
 206                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 207                         verbose = 1;
 208                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 209                         verbose = 0;
 210                 } else if (eqstr(arg, "-trace")) {
 211                         trace = 1;
 212                 } else if (eqstr(arg, "-sni")) {
 213                         if (++ i >= argc) {
 214                                 fprintf(stderr,
 215                                         "ERROR: no argument for '-sni'\n");
 216                                 usage_client();
 217                                 goto client_exit_error;
 218                         }
 219                         if (sni != NULL) {
 220                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 221                                 usage_client();
 222                                 goto client_exit_error;
 223                         }
 224                         sni = argv[i];
 225                 } else if (eqstr(arg, "-nosni")) {
 226                         if (sni != NULL) {
 227                                 fprintf(stderr, "ERROR: duplicate SNI\n");
 228                                 usage_client();
 229                                 goto client_exit_error;
 230                         }
 231                         sni = "";
 232                 } else if (eqstr(arg, "-mono")) {
 233                         bidi = 0;
 234                 } else if (eqstr(arg, "-buf")) {
 235                         if (++ i >= argc) {
 236                                 fprintf(stderr,
 237                                         "ERROR: no argument for '-buf'\n");
 238                                 usage_client();
 239                                 goto client_exit_error;
 240                         }
 241                         arg = argv[i];
 242                         if (iobuf_len != 0) {
 243                                 fprintf(stderr,
 244                                         "ERROR: duplicate I/O buffer length\n");
 245                                 usage_client();
 246                                 goto client_exit_error;
 247                         }
 248                         iobuf_len = parse_size(arg);
 249                         if (iobuf_len == (size_t)-1) {
 250                                 usage_client();
 251                                 goto client_exit_error;
 252                         }
 253                 } else if (eqstr(arg, "-CA")) {
 254                         if (++ i >= argc) {
 255                                 fprintf(stderr,
 256                                         "ERROR: no argument for '-CA'\n");
 257                                 usage_client();
 258                                 goto client_exit_error;
 259                         }
 260                         arg = argv[i];
 261                         if (read_trust_anchors(&anchors, arg) == 0) {
 262                                 usage_client();
 263                                 goto client_exit_error;
 264                         }
 265                 } else if (eqstr(arg, "-list")) {
 266                         list_names();
 267                         goto client_exit;
 268                 } else if (eqstr(arg, "-vmin")) {
 269                         if (++ i >= argc) {
 270                                 fprintf(stderr,
 271                                         "ERROR: no argument for '-vmin'\n");
 272                                 usage_client();
 273                                 goto client_exit_error;
 274                         }
 275                         arg = argv[i];
 276                         if (vmin != 0) {
 277                                 fprintf(stderr,
 278                                         "ERROR: duplicate minimum version\n");
 279                                 usage_client();
 280                                 goto client_exit_error;
 281                         }
 282                         vmin = parse_version(arg, strlen(arg));
 283                         if (vmin == 0) {
 284                                 fprintf(stderr,
 285                                         "ERROR: unrecognised version '%s'\n",
 286                                         arg);
 287                                 usage_client();
 288                                 goto client_exit_error;
 289                         }
 290                 } else if (eqstr(arg, "-vmax")) {
 291                         if (++ i >= argc) {
 292                                 fprintf(stderr,
 293                                         "ERROR: no argument for '-vmax'\n");
 294                                 usage_client();
 295                                 goto client_exit_error;
 296                         }
 297                         arg = argv[i];
 298                         if (vmax != 0) {
 299                                 fprintf(stderr,
 300                                         "ERROR: duplicate maximum version\n");
 301                                 usage_client();
 302                                 goto client_exit_error;
 303                         }
 304                         vmax = parse_version(arg, strlen(arg));
 305                         if (vmax == 0) {
 306                                 fprintf(stderr,
 307                                         "ERROR: unrecognised version '%s'\n",
 308                                         arg);
 309                                 usage_client();
 310                                 goto client_exit_error;
 311                         }
 312                 } else if (eqstr(arg, "-cs")) {
 313                         if (++ i >= argc) {
 314                                 fprintf(stderr,
 315                                         "ERROR: no argument for '-cs'\n");
 316                                 usage_client();
 317                                 goto client_exit_error;
 318                         }
 319                         arg = argv[i];
 320                         if (suites != NULL) {
 321                                 fprintf(stderr, "ERROR: duplicate list"
 322                                         " of cipher suites\n");
 323                                 usage_client();
 324                                 goto client_exit_error;
 325                         }
 326                         suites = parse_suites(arg, &num_suites);
 327                         if (suites == NULL) {
 328                                 usage_client();
 329                                 goto client_exit_error;
 330                         }
 331                 } else if (eqstr(arg, "-hf")) {
 332                         unsigned x;
 333
 334                         if (++ i >= argc) {
 335                                 fprintf(stderr,
 336                                         "ERROR: no argument for '-hf'\n");
 337                                 usage_client();
 338                                 goto client_exit_error;
 339                         }
 340                         arg = argv[i];
 341                         x = parse_hash_functions(arg);
 342                         if (x == 0) {
 343                                 usage_client();
 344                                 goto client_exit_error;
 345                         }
 346                         hfuns |= x;
 347                 } else {
 348                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 349                         usage_client();
 350                         goto client_exit_error;
 351                 }
 352         }
 353         if (server_name == NULL) {
 354                 fprintf(stderr, "ERROR: no server name/address provided\n");
 355                 usage_client();
 356                 goto client_exit_error;
 357         }
 358         for (u = strlen(server_name); u > 0; u --) {
 359                 int c = server_name[u - 1];
 360                 if (c == ':') {
 361                         break;
 362                 }
 363                 if (c < '0' || c > '9') {
 364                         u = 0;
 365                         break;
 366                 }
 367         }
 368         if (u == 0) {
 369                 host = xstrdup(server_name);
 370                 port = "443";
 371         } else {
 372                 port = xstrdup(server_name + u);
 373                 host = xmalloc(u);
 374                 memcpy(host, server_name, u - 1);
 375                 host[u - 1] = 0;
 376         }
 377         if (sni == NULL) {
 378                 sni = host;
 379         }
 380
 381         if (vmin == 0) {
 382                 vmin = BR_TLS10;
 383         }
 384         if (vmax == 0) {
 385                 vmax = BR_TLS12;
 386         }
 387         if (vmax < vmin) {
 388                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 389                         " version combination\n");
 390                 usage_client();
 391                 goto client_exit_error;
 392         }
 393         if (suites == NULL) {
 394                 num_suites = 0;
 395
 396                 for (u = 0; cipher_suites[u].name; u ++) {
 397                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 398                                 || vmax >= BR_TLS12)
 399                         {
 400                                 num_suites ++;
 401                         }
 402                 }
 403                 suites = xmalloc(num_suites * sizeof *suites);
 404                 num_suites = 0;
 405                 for (u = 0; cipher_suites[u].name; u ++) {
 406                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 407                                 || vmax >= BR_TLS12)
 408                         {
 409                                 suites[num_suites ++] = cipher_suites[u];
 410                         }
 411                 }
 412         }
 413         if (hfuns == 0) {
 414                 hfuns = (unsigned)-1;
 415         }
 416         if (iobuf_len == 0) {
 417                 if (bidi) {
 418                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 419                 } else {
 420                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 421                 }
 422         }
 423         iobuf = xmalloc(iobuf_len);
 424
 425         /*
 426          * Compute implementation requirements and inject implementations.
 427          */
 428         suite_ids = xmalloc(num_suites * sizeof *suite_ids);
 429         br_ssl_client_zero(&cc);
 430         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 431         dnhash = NULL;
 432         for (u = 0; hash_functions[u].name; u ++) {
 433                 const br_hash_class *hc;
 434                 int id;
 435
 436                 hc = hash_functions[u].hclass;
 437                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 438                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 439                         dnhash = hc;
 440                 }
 441         }
 442         if (dnhash == NULL) {
 443                 fprintf(stderr, "ERROR: no supported hash function\n");
 444                 goto client_exit_error;
 445         }
 446         br_x509_minimal_init(&xc, dnhash,
 447                 &VEC_ELT(anchors, 0), VEC_LEN(anchors));
 448         if (vmin <= BR_TLS11) {
 449                 if (!(hfuns & (1 << br_md5_ID))) {
 450                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 451                         goto client_exit_error;
 452                 }
 453                 if (!(hfuns & (1 << br_sha1_ID))) {
 454                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 455                         goto client_exit_error;
 456                 }
 457         }
 458         for (u = 0; u < num_suites; u ++) {
 459                 unsigned req;
 460
 461                 req = suites[u].req;
 462                 suite_ids[u] = suites[u].suite;
 463                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 464                         fprintf(stderr,
 465                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 466                                 suites[u].name);
 467                         goto client_exit_error;
 468                 }
 469                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 470                         fprintf(stderr,
 471                                 "ERROR: cipher suite %s requires SHA-1\n",
 472                                 suites[u].name);
 473                         goto client_exit_error;
 474                 }
 475                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
 476                         fprintf(stderr,
 477                                 "ERROR: cipher suite %s requires SHA-256\n",
 478                                 suites[u].name);
 479                         goto client_exit_error;
 480                 }
 481                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
 482                         fprintf(stderr,
 483                                 "ERROR: cipher suite %s requires SHA-384\n",
 484                                 suites[u].name);
 485                         goto client_exit_error;
 486                 }
 487                 /* TODO: algorithm implementation selection */
 488                 if ((req & REQ_AESCBC) != 0) {
 489                         br_ssl_engine_set_aes_cbc(&cc.eng,
 490                                 &br_aes_ct_cbcenc_vtable,
 491                                 &br_aes_ct_cbcdec_vtable);
 492                         br_ssl_engine_set_cbc(&cc.eng,
 493                                 &br_sslrec_in_cbc_vtable,
 494                                 &br_sslrec_out_cbc_vtable);
 495                 }
 496                 if ((req & REQ_AESGCM) != 0) {
 497                         br_ssl_engine_set_aes_ctr(&cc.eng,
 498                                 &br_aes_ct_ctr_vtable);
 499                         br_ssl_engine_set_ghash(&cc.eng,
 500                                 &br_ghash_ctmul);
 501                         br_ssl_engine_set_gcm(&cc.eng,
 502                                 &br_sslrec_in_gcm_vtable,
 503                                 &br_sslrec_out_gcm_vtable);
 504                 }
 505                 if ((req & REQ_3DESCBC) != 0) {
 506                         br_ssl_engine_set_des_cbc(&cc.eng,
 507                                 &br_des_ct_cbcenc_vtable,
 508                                 &br_des_ct_cbcdec_vtable);
 509                         br_ssl_engine_set_cbc(&cc.eng,
 510                                 &br_sslrec_in_cbc_vtable,
 511                                 &br_sslrec_out_cbc_vtable);
 512                 }
 513                 if ((req & REQ_RSAKEYX) != 0) {
 514                         br_ssl_client_set_rsapub(&cc, &br_rsa_i31_public);
 515                 }
 516                 if ((req & REQ_ECDHE_RSA) != 0) {
 517                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 518                         br_ssl_client_set_rsavrfy(&cc, &br_rsa_i31_pkcs1_vrfy);
 519                 }
 520                 if ((req & REQ_ECDHE_ECDSA) != 0) {
 521                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 522                         br_ssl_client_set_ecdsa(&cc, &br_ecdsa_i31_vrfy_asn1);
 523                 }
 524                 if ((req & REQ_ECDH) != 0) {
 525                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 526                 }
 527         }
 528         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
 529
 530         for (u = 0; hash_functions[u].name; u ++) {
 531                 const br_hash_class *hc;
 532                 int id;
 533
 534                 hc = hash_functions[u].hclass;
 535                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 536                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 537                         br_ssl_engine_set_hash(&cc.eng, id, hc);
 538                         br_x509_minimal_set_hash(&xc, id, hc);
 539                 }
 540         }
 541         if (vmin <= BR_TLS11) {
 542                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
 543         }
 544         if (vmax >= BR_TLS12) {
 545                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
 546                         br_ssl_engine_set_prf_sha256(&cc.eng,
 547                                 &br_tls12_sha256_prf);
 548                 }
 549                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
 550                         br_ssl_engine_set_prf_sha384(&cc.eng,
 551                                 &br_tls12_sha384_prf);
 552                 }
 553         }
 554         br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
 555         br_x509_minimal_set_ecdsa(&xc,
 556                 &br_ec_prime_i31, &br_ecdsa_i31_vrfy_asn1);
 557
 558         /*
 559          * If there is no provided trust anchor, then certificate validation
 560          * will always fail. In that situation, we use our custom wrapper
 561          * that tolerates unknown anchors.
 562          */
 563         if (VEC_LEN(anchors) == 0) {
 564                 if (verbose) {
 565                         fprintf(stderr,
 566                                 "WARNING: no configured trust anchor\n");
 567                 }
 568                 x509_noanchor_init(&xwc, &xc.vtable);
 569                 br_ssl_engine_set_x509(&cc.eng, &xwc.vtable);
 570         } else {
 571                 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
 572         }
 573
 574         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
 575         br_ssl_client_reset(&cc, sni, 0);
 576
 577         /*
 578          * Connect to the peer.
 579          */
 580         fd = host_connect(host, port, verbose);
 581         if (fd < 0) {
 582                 goto client_exit_error;
 583         }
 584
 585         /*
 586          * Run the engine until completion.
 587          */
 588         if (run_ssl_engine(&cc.eng, fd,
 589                 (verbose ? RUN_ENGINE_VERBOSE : 0)
 590                 | (trace ? RUN_ENGINE_TRACE : 0)) != 0)
 591         {
 592                 goto client_exit_error;
 593         } else {
 594                 goto client_exit;
 595         }
 596
 597         /*
 598          * Release allocated structures.
 599          */
 600 client_exit:
 601         xfree(host);
 602         xfree(suites);
 603         xfree(suite_ids);
 604         VEC_CLEAREXT(anchors, &free_ta_contents);
 605         xfree(iobuf);
 606         if (fd >= 0) {
 607                 close(fd);
 608         }
 609         return retcode;
 610
 611 client_exit_error:
 612         retcode = -1;
 613         goto client_exit;
 614 }