_ Git - BearSSL/blob - tools/server.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_bind(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                 struct sockaddr *sa;
  62                 struct sockaddr_in sa4;
  63                 struct sockaddr_in6 sa6;
  64                 size_t sa_len;
  65                 void *addr;
  66                 int opt;
  67
  68                 sa = (struct sockaddr *)p->ai_addr;
  69                 if (sa->sa_family == AF_INET) {
  70                         sa4 = *(struct sockaddr_in *)sa;
  71                         sa = (struct sockaddr *)&sa4;
  72                         sa_len = sizeof sa4;
  73                         addr = &sa4.sin_addr;
  74                         if (host == NULL) {
  75                                 sa4.sin_addr.s_addr = INADDR_ANY;
  76                         }
  77                 } else if (sa->sa_family == AF_INET6) {
  78                         sa6 = *(struct sockaddr_in6 *)sa;
  79                         sa = (struct sockaddr *)&sa6;
  80                         sa_len = sizeof sa6;
  81                         addr = &sa6.sin6_addr;
  82                         if (host == NULL) {
  83                                 sa6.sin6_addr = in6addr_any;
  84                         }
  85                 } else {
  86                         addr = NULL;
  87                         sa_len = p->ai_addrlen;
  88                 }
  89                 if (verbose) {
  90                         char tmp[INET6_ADDRSTRLEN + 50];
  91
  92                         if (addr != NULL) {
  93                                 if (!inet_ntop(p->ai_family, addr,
  94                                         tmp, sizeof tmp))
  95                                 {
  96                                         strcpy(tmp, "<invalid>");
  97                                 }
  98                         } else {
  99                                 sprintf(tmp, "<unknown family: %d>",
 100                                         (int)sa->sa_family);
 101                         }
 102                         fprintf(stderr, "binding to: %s\n", tmp);
 103                 }
 104                 fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
 105                 if (fd < 0) {
 106                         if (verbose) {
 107                                 perror("socket()");
 108                         }
 109                         continue;
 110                 }
 111                 opt = 1;
 112                 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof opt);
 113                 opt = 0;
 114                 setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof opt);
 115                 if (bind(fd, sa, sa_len) < 0) {
 116                         if (verbose) {
 117                                 perror("bind()");
 118                         }
 119                         close(fd);
 120                         continue;
 121                 }
 122                 break;
 123         }
 124         if (p == NULL) {
 125                 freeaddrinfo(si);
 126                 fprintf(stderr, "ERROR: failed to bind\n");
 127                 return -1;
 128         }
 129         freeaddrinfo(si);
 130         if (listen(fd, 5) < 0) {
 131                 if (verbose) {
 132                         perror("listen()");
 133                 }
 134                 close(fd);
 135                 return -1;
 136         }
 137         if (verbose) {
 138                 fprintf(stderr, "bound.\n");
 139         }
 140         return fd;
 141 }
 142
 143 static int
 144 accept_client(int server_fd, int verbose)
 145 {
 146         int fd;
 147         struct sockaddr sa;
 148         socklen_t sa_len;
 149
 150         sa_len = sizeof sa;
 151         fd = accept(server_fd, &sa, &sa_len);
 152         if (fd < 0) {
 153                 if (verbose) {
 154                         perror("accept()");
 155                 }
 156                 return -1;
 157         }
 158         if (verbose) {
 159                 char tmp[INET6_ADDRSTRLEN + 50];
 160                 const char *name;
 161
 162                 name = NULL;
 163                 switch (sa.sa_family) {
 164                 case AF_INET:
 165                         name = inet_ntop(AF_INET,
 166                                 &((struct sockaddr_in *)&sa)->sin_addr,
 167                                 tmp, sizeof tmp);
 168                         break;
 169                 case AF_INET6:
 170                         name = inet_ntop(AF_INET6,
 171                                 &((struct sockaddr_in6 *)&sa)->sin6_addr,
 172                                 tmp, sizeof tmp);
 173                         break;
 174                 }
 175                 if (name == NULL) {
 176                         sprintf(tmp, "<unknown: %lu>",
 177                                 (unsigned long)sa.sa_family);
 178                         name = tmp;
 179                 }
 180                 fprintf(stderr, "accepting connection from: %s\n", name);
 181         }
 182
 183         /*
 184          * We make the socket non-blocking, since we are going to use
 185          * poll() to organise I/O.
 186          */
 187         fcntl(fd, F_SETFL, O_NONBLOCK);
 188         return fd;
 189 }
 190
 191 static void
 192 usage_server(void)
 193 {
 194         fprintf(stderr,
 195 "usage: brssl server [ options ]\n");
 196         fprintf(stderr,
 197 "options:\n");
 198         fprintf(stderr,
 199 "   -q              suppress verbose messages\n");
 200         fprintf(stderr,
 201 "   -trace          activate extra debug messages (dump of all packets)\n");
 202         fprintf(stderr,
 203 "   -b name         bind to a specific address or host name\n");
 204         fprintf(stderr,
 205 "   -p port         bind to a specific port (default: 4433)\n");
 206         fprintf(stderr,
 207 "   -mono           use monodirectional buffering\n");
 208         fprintf(stderr,
 209 "   -buf length     set the I/O buffer length (in bytes)\n");
 210         fprintf(stderr,
 211 "   -cache length   set the session cache storage length (in bytes)\n");
 212         fprintf(stderr,
 213 "   -cert fname     read certificate chain from file 'fname'\n");
 214         fprintf(stderr,
 215 "   -key fname      read private key from file 'fname'\n");
 216         fprintf(stderr,
 217 "   -CA file        add trust anchors from 'file' (for client auth)\n");
 218         fprintf(stderr,
 219 "   -anon_ok        request but do not require a client certificate\n");
 220         fprintf(stderr,
 221 "   -list           list supported names (protocols, algorithms...)\n");
 222         fprintf(stderr,
 223 "   -vmin name      set minimum supported version (default: TLS-1.0)\n");
 224         fprintf(stderr,
 225 "   -vmax name      set maximum supported version (default: TLS-1.2)\n");
 226         fprintf(stderr,
 227 "   -cs names       set list of supported cipher suites (comma-separated)\n");
 228         fprintf(stderr,
 229 "   -hf names       add support for some hash functions (comma-separated)\n");
 230         fprintf(stderr,
 231 "   -serverpref     enforce server's preferences for cipher suites\n");
 232         exit(EXIT_FAILURE);
 233 }
 234
 235 typedef struct {
 236         const br_ssl_server_policy_class *vtable;
 237         int verbose;
 238         br_x509_certificate *chain;
 239         size_t chain_len;
 240         int cert_signer_algo;
 241         private_key *sk;
 242 } policy_context;
 243
 244 static void
 245 print_hashes(unsigned chashes)
 246 {
 247         int i;
 248
 249         for (i = 2; i <= 6; i ++) {
 250                 if ((chashes >> i) & 1) {
 251                         int z;
 252
 253                         switch (i) {
 254                         case 3: z = 224; break;
 255                         case 4: z = 256; break;
 256                         case 5: z = 384; break;
 257                         case 6: z = 512; break;
 258                         default:
 259                                 z = 1;
 260                                 break;
 261                         }
 262                         fprintf(stderr, " sha%d", z);
 263                 }
 264         }
 265 }
 266
 267 static int
 268 choose_hash(unsigned chashes)
 269 {
 270         int hash_id;
 271
 272         for (hash_id = 6; hash_id >= 2; hash_id --) {
 273                 if (((chashes >> hash_id) & 1) != 0) {
 274                         return hash_id;
 275                 }
 276         }
 277         /*
 278          * Normally unreachable.
 279          */
 280         return 0;
 281 }
 282
 283 static int
 284 sp_choose(const br_ssl_server_policy_class **pctx,
 285         const br_ssl_server_context *cc,
 286         br_ssl_server_choices *choices)
 287 {
 288         policy_context *pc;
 289         const br_suite_translated *st;
 290         size_t u, st_num;
 291         unsigned chashes;
 292
 293         pc = (policy_context *)pctx;
 294         st = br_ssl_server_get_client_suites(cc, &st_num);
 295         chashes = br_ssl_server_get_client_hashes(cc);
 296         if (pc->verbose) {
 297                 fprintf(stderr, "Client parameters:\n");
 298                 fprintf(stderr, "   Maximum version:      ");
 299                 switch (cc->client_max_version) {
 300                 case BR_SSL30:
 301                         fprintf(stderr, "SSL 3.0");
 302                         break;
 303                 case BR_TLS10:
 304                         fprintf(stderr, "TLS 1.0");
 305                         break;
 306                 case BR_TLS11:
 307                         fprintf(stderr, "TLS 1.1");
 308                         break;
 309                 case BR_TLS12:
 310                         fprintf(stderr, "TLS 1.2");
 311                         break;
 312                 default:
 313                         fprintf(stderr, "unknown (0x%04X)",
 314                                 (unsigned)cc->client_max_version);
 315                         break;
 316                 }
 317                 fprintf(stderr, "\n");
 318                 fprintf(stderr, "   Compatible cipher suites:\n");
 319                 for (u = 0; u < st_num; u ++) {
 320                         char csn[80];
 321
 322                         get_suite_name_ext(st[u][0], csn, sizeof csn);
 323                         fprintf(stderr, "      %s\n", csn);
 324                 }
 325                 fprintf(stderr, "   Common sign+hash functions:\n");
 326                 if ((chashes & 0xFF) != 0) {
 327                         fprintf(stderr, "      with RSA:");
 328                         print_hashes(chashes);
 329                         fprintf(stderr, "\n");
 330                 }
 331                 if ((chashes >> 8) != 0) {
 332                         fprintf(stderr, "      with ECDSA:");
 333                         print_hashes(chashes >> 8);
 334                         fprintf(stderr, "\n");
 335                 }
 336         }
 337         for (u = 0; u < st_num; u ++) {
 338                 unsigned tt;
 339
 340                 tt = st[u][1];
 341                 switch (tt >> 12) {
 342                 case BR_SSLKEYX_RSA:
 343                         if (pc->sk->key_type == BR_KEYTYPE_RSA) {
 344                                 choices->cipher_suite = st[u][0];
 345                                 goto choose_ok;
 346                         }
 347                         break;
 348                 case BR_SSLKEYX_ECDHE_RSA:
 349                         if (pc->sk->key_type == BR_KEYTYPE_RSA) {
 350                                 choices->cipher_suite = st[u][0];
 351                                 if (br_ssl_engine_get_version(&cc->eng)
 352                                         < BR_TLS12)
 353                                 {
 354                                         choices->hash_id = 0;
 355                                 } else {
 356                                         choices->hash_id = choose_hash(chashes);
 357                                 }
 358                                 goto choose_ok;
 359                         }
 360                         break;
 361                 case BR_SSLKEYX_ECDHE_ECDSA:
 362                         if (pc->sk->key_type == BR_KEYTYPE_EC) {
 363                                 choices->cipher_suite = st[u][0];
 364                                 if (br_ssl_engine_get_version(&cc->eng)
 365                                         < BR_TLS12)
 366                                 {
 367                                         choices->hash_id = br_sha1_ID;
 368                                 } else {
 369                                         choices->hash_id =
 370                                                 choose_hash(chashes >> 8);
 371                                 }
 372                                 goto choose_ok;
 373                         }
 374                         break;
 375                 case BR_SSLKEYX_ECDH_RSA:
 376                         if (pc->sk->key_type == BR_KEYTYPE_EC
 377                                 && pc->cert_signer_algo == BR_KEYTYPE_RSA)
 378                         {
 379                                 choices->cipher_suite = st[u][0];
 380                                 goto choose_ok;
 381                         }
 382                         break;
 383                 case BR_SSLKEYX_ECDH_ECDSA:
 384                         if (pc->sk->key_type == BR_KEYTYPE_EC
 385                                 && pc->cert_signer_algo == BR_KEYTYPE_EC)
 386                         {
 387                                 choices->cipher_suite = st[u][0];
 388                                 goto choose_ok;
 389                         }
 390                         break;
 391                 }
 392         }
 393         return 0;
 394
 395 choose_ok:
 396         choices->chain = pc->chain;
 397         choices->chain_len = pc->chain_len;
 398         if (pc->verbose) {
 399                 char csn[80];
 400
 401                 get_suite_name_ext(choices->cipher_suite, csn, sizeof csn);
 402                 fprintf(stderr, "Using: %s\n", csn);
 403         }
 404         return 1;
 405 }
 406
 407 static uint32_t
 408 sp_do_keyx(const br_ssl_server_policy_class **pctx,
 409         unsigned char *data, size_t len)
 410 {
 411         policy_context *pc;
 412
 413         pc = (policy_context *)pctx;
 414         switch (pc->sk->key_type) {
 415         case BR_KEYTYPE_RSA:
 416                 return br_rsa_ssl_decrypt(
 417                         &br_rsa_i31_private, &pc->sk->key.rsa,
 418                         data, len);
 419         case BR_KEYTYPE_EC:
 420                 return br_ec_prime_i31.mul(data, len, pc->sk->key.ec.x,
 421                         pc->sk->key.ec.xlen, pc->sk->key.ec.curve);
 422         default:
 423                 fprintf(stderr, "ERROR: unknown private key type (%d)\n",
 424                         (int)pc->sk->key_type);
 425                 return 0;
 426         }
 427 }
 428
 429 static size_t
 430 sp_do_sign(const br_ssl_server_policy_class **pctx,
 431         int hash_id, size_t hv_len, unsigned char *data, size_t len)
 432 {
 433         policy_context *pc;
 434         unsigned char hv[64];
 435
 436         pc = (policy_context *)pctx;
 437         memcpy(hv, data, hv_len);
 438         switch (pc->sk->key_type) {
 439                 size_t sig_len;
 440                 uint32_t x;
 441                 const unsigned char *hash_oid;
 442                 const br_hash_class *hc;
 443
 444         case BR_KEYTYPE_RSA:
 445                 hash_oid = get_hash_oid(hash_id);
 446                 if (hash_oid == NULL && hash_id != 0) {
 447                         if (pc->verbose) {
 448                                 fprintf(stderr, "ERROR: cannot RSA-sign with"
 449                                         " unknown hash function: %d\n",
 450                                         hash_id);
 451                         }
 452                         return 0;
 453                 }
 454                 sig_len = (pc->sk->key.rsa.n_bitlen + 7) >> 3;
 455                 if (len < sig_len) {
 456                         if (pc->verbose) {
 457                                 fprintf(stderr, "ERROR: cannot RSA-sign,"
 458                                         " buffer is too small"
 459                                         " (sig=%lu, buf=%lu)\n",
 460                                         (unsigned long)sig_len,
 461                                         (unsigned long)len);
 462                         }
 463                         return 0;
 464                 }
 465                 x = br_rsa_i31_pkcs1_sign(hash_oid, hv, hv_len,
 466                         &pc->sk->key.rsa, data);
 467                 if (!x) {
 468                         if (pc->verbose) {
 469                                 fprintf(stderr, "ERROR: RSA-sign failure\n");
 470                         }
 471                         return 0;
 472                 }
 473                 return sig_len;
 474
 475         case BR_KEYTYPE_EC:
 476                 hc = get_hash_impl(hash_id);
 477                 if (hc == NULL) {
 478                         if (pc->verbose) {
 479                                 fprintf(stderr, "ERROR: cannot ECDSA-sign with"
 480                                         " unknown hash function: %d\n",
 481                                         hash_id);
 482                         }
 483                         return 0;
 484                 }
 485                 if (len < 139) {
 486                         if (pc->verbose) {
 487                                 fprintf(stderr, "ERROR: cannot ECDSA-sign"
 488                                         " (output buffer = %lu)\n",
 489                                         (unsigned long)len);
 490                         }
 491                         return 0;
 492                 }
 493                 sig_len = br_ecdsa_i31_sign_asn1(&br_ec_prime_i31,
 494                         hc, hv, &pc->sk->key.ec, data);
 495                 if (sig_len == 0) {
 496                         if (pc->verbose) {
 497                                 fprintf(stderr, "ERROR: ECDSA-sign failure\n");
 498                         }
 499                         return 0;
 500                 }
 501                 return sig_len;
 502
 503         default:
 504                 return 0;
 505         }
 506 }
 507
 508 static const br_ssl_server_policy_class policy_vtable = {
 509         sizeof(policy_context),
 510         sp_choose,
 511         sp_do_keyx,
 512         sp_do_sign
 513 };
 514
 515 /* see brssl.h */
 516 int
 517 do_server(int argc, char *argv[])
 518 {
 519         int retcode;
 520         int verbose;
 521         int trace;
 522         int i, bidi;
 523         const char *bind_name;
 524         const char *port;
 525         unsigned vmin, vmax;
 526         cipher_suite *suites;
 527         size_t num_suites;
 528         uint16_t *suite_ids;
 529         unsigned hfuns;
 530         br_x509_certificate *chain;
 531         size_t chain_len;
 532         int cert_signer_algo;
 533         private_key *sk;
 534         anchor_list anchors = VEC_INIT;
 535         br_x509_minimal_context xc;
 536         const br_hash_class *dnhash;
 537         size_t u;
 538         br_ssl_server_context cc;
 539         policy_context pc;
 540         br_ssl_session_cache_lru lru;
 541         unsigned char *iobuf, *cache;
 542         size_t iobuf_len, cache_len;
 543         uint32_t flags;
 544         int server_fd, fd;
 545
 546         retcode = 0;
 547         verbose = 1;
 548         trace = 0;
 549         bind_name = NULL;
 550         port = NULL;
 551         bidi = 1;
 552         vmin = 0;
 553         vmax = 0;
 554         suites = NULL;
 555         num_suites = 0;
 556         hfuns = 0;
 557         suite_ids = NULL;
 558         chain = NULL;
 559         chain_len = 0;
 560         sk = NULL;
 561         iobuf = NULL;
 562         iobuf_len = 0;
 563         cache = NULL;
 564         cache_len = (size_t)-1;
 565         flags = 0;
 566         server_fd = -1;
 567         fd = -1;
 568         for (i = 0; i < argc; i ++) {
 569                 const char *arg;
 570
 571                 arg = argv[i];
 572                 if (arg[0] != '-') {
 573                         usage_server();
 574                         goto server_exit_error;
 575                 }
 576                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 577                         verbose = 1;
 578                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 579                         verbose = 0;
 580                 } else if (eqstr(arg, "-trace")) {
 581                         trace = 1;
 582                 } else if (eqstr(arg, "-b")) {
 583                         if (++ i >= argc) {
 584                                 fprintf(stderr,
 585                                         "ERROR: no argument for '-b'\n");
 586                                 usage_server();
 587                                 goto server_exit_error;
 588                         }
 589                         if (bind_name != NULL) {
 590                                 fprintf(stderr, "ERROR: duplicate bind host\n");
 591                                 usage_server();
 592                                 goto server_exit_error;
 593                         }
 594                         bind_name = argv[i];
 595                 } else if (eqstr(arg, "-p")) {
 596                         if (++ i >= argc) {
 597                                 fprintf(stderr,
 598                                         "ERROR: no argument for '-p'\n");
 599                                 usage_server();
 600                                 goto server_exit_error;
 601                         }
 602                         if (port != NULL) {
 603                                 fprintf(stderr, "ERROR: duplicate bind port\n");
 604                                 usage_server();
 605                                 goto server_exit_error;
 606                         }
 607                         port = argv[i];
 608                 } else if (eqstr(arg, "-mono")) {
 609                         bidi = 0;
 610                 } else if (eqstr(arg, "-buf")) {
 611                         if (++ i >= argc) {
 612                                 fprintf(stderr,
 613                                         "ERROR: no argument for '-buf'\n");
 614                                 usage_server();
 615                                 goto server_exit_error;
 616                         }
 617                         arg = argv[i];
 618                         if (iobuf_len != 0) {
 619                                 fprintf(stderr,
 620                                         "ERROR: duplicate I/O buffer length\n");
 621                                 usage_server();
 622                                 goto server_exit_error;
 623                         }
 624                         iobuf_len = parse_size(arg);
 625                         if (iobuf_len == (size_t)-1) {
 626                                 usage_server();
 627                                 goto server_exit_error;
 628                         }
 629                 } else if (eqstr(arg, "-cache")) {
 630                         if (++ i >= argc) {
 631                                 fprintf(stderr,
 632                                         "ERROR: no argument for '-cache'\n");
 633                                 usage_server();
 634                                 goto server_exit_error;
 635                         }
 636                         arg = argv[i];
 637                         if (cache_len != (size_t)-1) {
 638                                 fprintf(stderr, "ERROR: duplicate session"
 639                                         " cache length\n");
 640                                 usage_server();
 641                                 goto server_exit_error;
 642                         }
 643                         cache_len = parse_size(arg);
 644                         if (cache_len == (size_t)-1) {
 645                                 usage_server();
 646                                 goto server_exit_error;
 647                         }
 648                 } else if (eqstr(arg, "-cert")) {
 649                         if (++ i >= argc) {
 650                                 fprintf(stderr,
 651                                         "ERROR: no argument for '-cert'\n");
 652                                 usage_server();
 653                                 goto server_exit_error;
 654                         }
 655                         if (chain != NULL) {
 656                                 fprintf(stderr,
 657                                         "ERROR: duplicate certificate chain\n");
 658                                 usage_server();
 659                                 goto server_exit_error;
 660                         }
 661                         arg = argv[i];
 662                         chain = read_certificates(arg, &chain_len);
 663                         if (chain == NULL || chain_len == 0) {
 664                                 goto server_exit_error;
 665                         }
 666                 } else if (eqstr(arg, "-key")) {
 667                         if (++ i >= argc) {
 668                                 fprintf(stderr,
 669                                         "ERROR: no argument for '-key'\n");
 670                                 usage_server();
 671                                 goto server_exit_error;
 672                         }
 673                         if (sk != NULL) {
 674                                 fprintf(stderr,
 675                                         "ERROR: duplicate private key\n");
 676                                 usage_server();
 677                                 goto server_exit_error;
 678                         }
 679                         arg = argv[i];
 680                         sk = read_private_key(arg);
 681                         if (sk == NULL) {
 682                                 goto server_exit_error;
 683                         }
 684                 } else if (eqstr(arg, "-CA")) {
 685                         if (++ i >= argc) {
 686                                 fprintf(stderr,
 687                                         "ERROR: no argument for '-CA'\n");
 688                                 usage_server();
 689                                 goto server_exit_error;
 690                         }
 691                         arg = argv[i];
 692                         if (read_trust_anchors(&anchors, arg) == 0) {
 693                                 usage_server();
 694                                 goto server_exit_error;
 695                         }
 696                 } else if (eqstr(arg, "-anon_ok")) {
 697                         flags |= BR_OPT_TOLERATE_NO_CLIENT_AUTH;
 698                 } else if (eqstr(arg, "-list")) {
 699                         list_names();
 700                         goto server_exit;
 701                 } else if (eqstr(arg, "-vmin")) {
 702                         if (++ i >= argc) {
 703                                 fprintf(stderr,
 704                                         "ERROR: no argument for '-vmin'\n");
 705                                 usage_server();
 706                                 goto server_exit_error;
 707                         }
 708                         arg = argv[i];
 709                         if (vmin != 0) {
 710                                 fprintf(stderr,
 711                                         "ERROR: duplicate minimum version\n");
 712                                 usage_server();
 713                                 goto server_exit_error;
 714                         }
 715                         vmin = parse_version(arg, strlen(arg));
 716                         if (vmin == 0) {
 717                                 fprintf(stderr,
 718                                         "ERROR: unrecognised version '%s'\n",
 719                                         arg);
 720                                 usage_server();
 721                                 goto server_exit_error;
 722                         }
 723                 } else if (eqstr(arg, "-vmax")) {
 724                         if (++ i >= argc) {
 725                                 fprintf(stderr,
 726                                         "ERROR: no argument for '-vmax'\n");
 727                                 usage_server();
 728                                 goto server_exit_error;
 729                         }
 730                         arg = argv[i];
 731                         if (vmax != 0) {
 732                                 fprintf(stderr,
 733                                         "ERROR: duplicate maximum version\n");
 734                                 usage_server();
 735                                 goto server_exit_error;
 736                         }
 737                         vmax = parse_version(arg, strlen(arg));
 738                         if (vmax == 0) {
 739                                 fprintf(stderr,
 740                                         "ERROR: unrecognised version '%s'\n",
 741                                         arg);
 742                                 usage_server();
 743                                 goto server_exit_error;
 744                         }
 745                 } else if (eqstr(arg, "-cs")) {
 746                         if (++ i >= argc) {
 747                                 fprintf(stderr,
 748                                         "ERROR: no argument for '-cs'\n");
 749                                 usage_server();
 750                                 goto server_exit_error;
 751                         }
 752                         arg = argv[i];
 753                         if (suites != NULL) {
 754                                 fprintf(stderr, "ERROR: duplicate list"
 755                                         " of cipher suites\n");
 756                                 usage_server();
 757                                 goto server_exit_error;
 758                         }
 759                         suites = parse_suites(arg, &num_suites);
 760                         if (suites == NULL) {
 761                                 usage_server();
 762                                 goto server_exit_error;
 763                         }
 764                 } else if (eqstr(arg, "-hf")) {
 765                         unsigned x;
 766
 767                         if (++ i >= argc) {
 768                                 fprintf(stderr,
 769                                         "ERROR: no argument for '-hf'\n");
 770                                 usage_server();
 771                                 goto server_exit_error;
 772                         }
 773                         arg = argv[i];
 774                         x = parse_hash_functions(arg);
 775                         if (x == 0) {
 776                                 usage_server();
 777                                 goto server_exit_error;
 778                         }
 779                         hfuns |= x;
 780                 } else if (eqstr(arg, "-serverpref")) {
 781                         flags |= BR_OPT_ENFORCE_SERVER_PREFERENCES;
 782                 } else if (eqstr(arg, "-noreneg")) {
 783                         flags |= BR_OPT_NO_RENEGOTIATION;
 784                 } else {
 785                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 786                         usage_server();
 787                         goto server_exit_error;
 788                 }
 789         }
 790         if (port == NULL) {
 791                 port = "4433";
 792         }
 793         if (vmin == 0) {
 794                 vmin = BR_TLS10;
 795         }
 796         if (vmax == 0) {
 797                 vmax = BR_TLS12;
 798         }
 799         if (vmax < vmin) {
 800                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 801                         " version combination\n");
 802                 usage_server();
 803                 goto server_exit_error;
 804         }
 805         if (suites == NULL) {
 806                 num_suites = 0;
 807
 808                 for (u = 0; cipher_suites[u].name; u ++) {
 809                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 810                                 || vmax >= BR_TLS12)
 811                         {
 812                                 num_suites ++;
 813                         }
 814                 }
 815                 suites = xmalloc(num_suites * sizeof *suites);
 816                 num_suites = 0;
 817                 for (u = 0; cipher_suites[u].name; u ++) {
 818                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 819                                 || vmax >= BR_TLS12)
 820                         {
 821                                 suites[num_suites ++] = cipher_suites[u];
 822                         }
 823                 }
 824         }
 825         if (hfuns == 0) {
 826                 hfuns = (unsigned)-1;
 827         }
 828         if (chain == NULL || chain_len == 0) {
 829                 fprintf(stderr, "ERROR: no certificate chain provided\n");
 830                 goto server_exit_error;
 831         }
 832         if (sk == NULL) {
 833                 fprintf(stderr, "ERROR: no private key provided\n");
 834                 goto server_exit_error;
 835         }
 836         switch (sk->key_type) {
 837                 int curve;
 838                 uint32_t supp;
 839
 840         case BR_KEYTYPE_RSA:
 841                 break;
 842         case BR_KEYTYPE_EC:
 843                 curve = sk->key.ec.curve;
 844                 supp = br_ec_prime_i31.supported_curves;
 845                 if (curve > 31 || !((supp >> curve) & 1)) {
 846                         fprintf(stderr, "ERROR: private key curve (%d)"
 847                                 " is not supported\n", curve);
 848                         goto server_exit_error;
 849                 }
 850                 break;
 851         default:
 852                 fprintf(stderr, "ERROR: unsupported private key type (%d)\n",
 853                         sk->key_type);
 854                 break;
 855         }
 856         cert_signer_algo = get_cert_signer_algo(chain);
 857         if (cert_signer_algo == 0) {
 858                 goto server_exit_error;
 859         }
 860         if (verbose) {
 861                 const char *csas;
 862
 863                 switch (cert_signer_algo) {
 864                 case BR_KEYTYPE_RSA: csas = "RSA"; break;
 865                 case BR_KEYTYPE_EC:  csas = "EC"; break;
 866                 default:
 867                         csas = "unknown";
 868                         break;
 869                 }
 870                 fprintf(stderr, "Issuing CA key type: %d (%s)\n",
 871                         cert_signer_algo, csas);
 872         }
 873         if (iobuf_len == 0) {
 874                 if (bidi) {
 875                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 876                 } else {
 877                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 878                 }
 879         }
 880         iobuf = xmalloc(iobuf_len);
 881         if (cache_len == (size_t)-1) {
 882                 cache_len = 5000;
 883         }
 884         cache = xmalloc(cache_len);
 885
 886         /*
 887          * Compute implementation requirements and inject implementations.
 888          */
 889         suite_ids = xmalloc(num_suites * sizeof *suite_ids);
 890         br_ssl_server_zero(&cc);
 891         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 892         br_ssl_engine_set_all_flags(&cc.eng, flags);
 893         if (vmin <= BR_TLS11) {
 894                 if (!(hfuns & (1 << br_md5_ID))) {
 895                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 896                         goto server_exit_error;
 897                 }
 898                 if (!(hfuns & (1 << br_sha1_ID))) {
 899                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 900                         goto server_exit_error;
 901                 }
 902         }
 903         for (u = 0; u < num_suites; u ++) {
 904                 unsigned req;
 905
 906                 req = suites[u].req;
 907                 suite_ids[u] = suites[u].suite;
 908                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 909                         fprintf(stderr,
 910                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 911                                 suites[u].name);
 912                         goto server_exit_error;
 913                 }
 914                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 915                         fprintf(stderr,
 916                                 "ERROR: cipher suite %s requires SHA-1\n",
 917                                 suites[u].name);
 918                         goto server_exit_error;
 919                 }
 920                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
 921                         fprintf(stderr,
 922                                 "ERROR: cipher suite %s requires SHA-256\n",
 923                                 suites[u].name);
 924                         goto server_exit_error;
 925                 }
 926                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
 927                         fprintf(stderr,
 928                                 "ERROR: cipher suite %s requires SHA-384\n",
 929                                 suites[u].name);
 930                         goto server_exit_error;
 931                 }
 932                 /* TODO: algorithm implementation selection */
 933                 if ((req & REQ_AESCBC) != 0) {
 934                         br_ssl_engine_set_aes_cbc(&cc.eng,
 935                                 &br_aes_ct_cbcenc_vtable,
 936                                 &br_aes_ct_cbcdec_vtable);
 937                         br_ssl_engine_set_cbc(&cc.eng,
 938                                 &br_sslrec_in_cbc_vtable,
 939                                 &br_sslrec_out_cbc_vtable);
 940                 }
 941                 if ((req & REQ_AESGCM) != 0) {
 942                         br_ssl_engine_set_aes_ctr(&cc.eng,
 943                                 &br_aes_ct_ctr_vtable);
 944                         br_ssl_engine_set_ghash(&cc.eng,
 945                                 &br_ghash_ctmul);
 946                         br_ssl_engine_set_gcm(&cc.eng,
 947                                 &br_sslrec_in_gcm_vtable,
 948                                 &br_sslrec_out_gcm_vtable);
 949                 }
 950                 if ((req & REQ_3DESCBC) != 0) {
 951                         br_ssl_engine_set_des_cbc(&cc.eng,
 952                                 &br_des_ct_cbcenc_vtable,
 953                                 &br_des_ct_cbcdec_vtable);
 954                         br_ssl_engine_set_cbc(&cc.eng,
 955                                 &br_sslrec_in_cbc_vtable,
 956                                 &br_sslrec_out_cbc_vtable);
 957                 }
 958                 if ((req & (REQ_ECDHE_RSA | REQ_ECDHE_ECDSA)) != 0) {
 959                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 960                 }
 961         }
 962         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
 963
 964         dnhash = NULL;
 965         for (u = 0; hash_functions[u].name; u ++) {
 966                 const br_hash_class *hc;
 967                 int id;
 968
 969                 hc = hash_functions[u].hclass;
 970                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 971                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 972                         dnhash = hc;
 973                         br_ssl_engine_set_hash(&cc.eng, id, hc);
 974                 }
 975         }
 976         if (vmin <= BR_TLS11) {
 977                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
 978         }
 979         if (vmax >= BR_TLS12) {
 980                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
 981                         br_ssl_engine_set_prf_sha256(&cc.eng,
 982                                 &br_tls12_sha256_prf);
 983                 }
 984                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
 985                         br_ssl_engine_set_prf_sha384(&cc.eng,
 986                                 &br_tls12_sha384_prf);
 987                 }
 988         }
 989
 990         br_ssl_session_cache_lru_init(&lru, cache, cache_len);
 991         br_ssl_server_set_cache(&cc, &lru.vtable);
 992
 993         /*
 994          * Set the policy handler (that chooses the actual cipher suite,
 995          * selects the certificate chain, and runs the private key
 996          * operations).
 997          */
 998         pc.vtable = &policy_vtable;
 999         pc.verbose = verbose;
1000         pc.chain = chain;
1001         pc.chain_len = chain_len;
1002         pc.cert_signer_algo = cert_signer_algo;
1003         pc.sk = sk;
1004         br_ssl_server_set_policy(&cc, &pc.vtable);
1005
1006         /*
1007          * If trust anchors have been configured, then set an X.509
1008          * validation engine and activate client certificate
1009          * authentication.
1010          */
1011         if (VEC_LEN(anchors) != 0) {
1012                 br_x509_minimal_init(&xc, dnhash,
1013                         &VEC_ELT(anchors, 0), VEC_LEN(anchors));
1014                 for (u = 0; hash_functions[u].name; u ++) {
1015                         const br_hash_class *hc;
1016                         int id;
1017
1018                         hc = hash_functions[u].hclass;
1019                         id = (hc->desc >> BR_HASHDESC_ID_OFF)
1020                                 & BR_HASHDESC_ID_MASK;
1021                         if ((hfuns & ((unsigned)1 << id)) != 0) {
1022                                 br_x509_minimal_set_hash(&xc, id, hc);
1023                         }
1024                 }
1025                 br_ssl_engine_set_rsavrfy(&cc.eng, &br_rsa_i31_pkcs1_vrfy);
1026                 br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
1027                 br_ssl_engine_set_ecdsa(&cc.eng, &br_ecdsa_i31_vrfy_asn1);
1028                 br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
1029                 br_x509_minimal_set_ecdsa(&xc,
1030                         &br_ec_prime_i31, &br_ecdsa_i31_vrfy_asn1);
1031                 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
1032                 br_ssl_server_set_trust_anchor_names_alt(&cc,
1033                         &VEC_ELT(anchors, 0), VEC_LEN(anchors));
1034         }
1035
1036         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
1037
1038         /*
1039          * We need to ignore SIGPIPE.
1040          */
1041         signal(SIGPIPE, SIG_IGN);
1042
1043         /*
1044          * Open the server socket.
1045          */
1046         server_fd = host_bind(bind_name, port, verbose);
1047         if (server_fd < 0) {
1048                 goto server_exit_error;
1049         }
1050
1051         /*
1052          * Process incoming clients, one at a time. Note that we do not
1053          * accept any client until the previous connection has finished:
1054          * this is voluntary, since the tool uses stdin/stdout for
1055          * application data, and thus cannot really run two connections
1056          * simultaneously.
1057          */
1058         for (;;) {
1059                 int x;
1060
1061                 fd = accept_client(server_fd, verbose);
1062                 if (fd < 0) {
1063                         goto server_exit_error;
1064                 }
1065                 br_ssl_server_reset(&cc);
1066                 x = run_ssl_engine(&cc.eng, fd,
1067                         (verbose ? RUN_ENGINE_VERBOSE : 0)
1068                         | (trace ? RUN_ENGINE_TRACE : 0));
1069                 close(fd);
1070                 fd = -1;
1071                 if (x < -1) {
1072                         goto server_exit_error;
1073                 }
1074         }
1075
1076         /*
1077          * Release allocated structures.
1078          */
1079 server_exit:
1080         xfree(suites);
1081         xfree(suite_ids);
1082         free_certificates(chain, chain_len);
1083         free_private_key(sk);
1084         VEC_CLEAREXT(anchors, &free_ta_contents);
1085         xfree(iobuf);
1086         xfree(cache);
1087         if (fd >= 0) {
1088                 close(fd);
1089         }
1090         return retcode;
1091
1092 server_exit_error:
1093         retcode = -1;
1094         goto server_exit;
1095 }