_ 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 "   -cbhash         test hashing in policy callback\n");
 232         fprintf(stderr,
 233 "   -serverpref     enforce server's preferences for cipher suites\n");
 234         fprintf(stderr,
 235 "   -noreneg        prohibit renegotiations\n");
 236         fprintf(stderr,
 237 "   -alpn name      add protocol name to list of protocols (ALPN extension)\n");
 238         fprintf(stderr,
 239 "   -strictalpn     fail on ALPN mismatch\n");
 240         exit(EXIT_FAILURE);
 241 }
 242
 243 typedef struct {
 244         const br_ssl_server_policy_class *vtable;
 245         int verbose;
 246         br_x509_certificate *chain;
 247         size_t chain_len;
 248         int cert_signer_algo;
 249         private_key *sk;
 250         int cbhash;
 251 } policy_context;
 252
 253 static void
 254 print_hashes(unsigned chashes)
 255 {
 256         int i;
 257
 258         for (i = 2; i <= 6; i ++) {
 259                 if ((chashes >> i) & 1) {
 260                         int z;
 261
 262                         switch (i) {
 263                         case 3: z = 224; break;
 264                         case 4: z = 256; break;
 265                         case 5: z = 384; break;
 266                         case 6: z = 512; break;
 267                         default:
 268                                 z = 1;
 269                                 break;
 270                         }
 271                         fprintf(stderr, " sha%d", z);
 272                 }
 273         }
 274 }
 275
 276 static unsigned
 277 choose_hash(unsigned chashes)
 278 {
 279         unsigned hash_id;
 280
 281         for (hash_id = 6; hash_id >= 2; hash_id --) {
 282                 if (((chashes >> hash_id) & 1) != 0) {
 283                         return hash_id;
 284                 }
 285         }
 286         /*
 287          * Normally unreachable.
 288          */
 289         return 0;
 290 }
 291
 292 static int
 293 sp_choose(const br_ssl_server_policy_class **pctx,
 294         const br_ssl_server_context *cc,
 295         br_ssl_server_choices *choices)
 296 {
 297         policy_context *pc;
 298         const br_suite_translated *st;
 299         size_t u, st_num;
 300         unsigned chashes;
 301
 302         pc = (policy_context *)pctx;
 303         st = br_ssl_server_get_client_suites(cc, &st_num);
 304         chashes = br_ssl_server_get_client_hashes(cc);
 305         if (pc->verbose) {
 306                 fprintf(stderr, "Client parameters:\n");
 307                 fprintf(stderr, "   Maximum version:      ");
 308                 switch (cc->client_max_version) {
 309                 case BR_SSL30:
 310                         fprintf(stderr, "SSL 3.0");
 311                         break;
 312                 case BR_TLS10:
 313                         fprintf(stderr, "TLS 1.0");
 314                         break;
 315                 case BR_TLS11:
 316                         fprintf(stderr, "TLS 1.1");
 317                         break;
 318                 case BR_TLS12:
 319                         fprintf(stderr, "TLS 1.2");
 320                         break;
 321                 default:
 322                         fprintf(stderr, "unknown (0x%04X)",
 323                                 (unsigned)cc->client_max_version);
 324                         break;
 325                 }
 326                 fprintf(stderr, "\n");
 327                 fprintf(stderr, "   Compatible cipher suites:\n");
 328                 for (u = 0; u < st_num; u ++) {
 329                         char csn[80];
 330
 331                         get_suite_name_ext(st[u][0], csn, sizeof csn);
 332                         fprintf(stderr, "      %s\n", csn);
 333                 }
 334                 fprintf(stderr, "   Common sign+hash functions:\n");
 335                 if ((chashes & 0xFF) != 0) {
 336                         fprintf(stderr, "      with RSA:");
 337                         print_hashes(chashes);
 338                         fprintf(stderr, "\n");
 339                 }
 340                 if ((chashes >> 8) != 0) {
 341                         fprintf(stderr, "      with ECDSA:");
 342                         print_hashes(chashes >> 8);
 343                         fprintf(stderr, "\n");
 344                 }
 345         }
 346         for (u = 0; u < st_num; u ++) {
 347                 unsigned tt;
 348
 349                 tt = st[u][1];
 350                 switch (tt >> 12) {
 351                 case BR_SSLKEYX_RSA:
 352                         if (pc->sk->key_type == BR_KEYTYPE_RSA) {
 353                                 choices->cipher_suite = st[u][0];
 354                                 goto choose_ok;
 355                         }
 356                         break;
 357                 case BR_SSLKEYX_ECDHE_RSA:
 358                         if (pc->sk->key_type == BR_KEYTYPE_RSA) {
 359                                 choices->cipher_suite = st[u][0];
 360                                 if (br_ssl_engine_get_version(&cc->eng)
 361                                         < BR_TLS12)
 362                                 {
 363                                         if (pc->cbhash) {
 364                                                 choices->algo_id = 0x0001;
 365                                         } else {
 366                                                 choices->algo_id = 0xFF00;
 367                                         }
 368                                 } else {
 369                                         unsigned id;
 370
 371                                         id = choose_hash(chashes);
 372                                         if (pc->cbhash) {
 373                                                 choices->algo_id =
 374                                                         (id << 8) + 0x01;
 375                                         } else {
 376                                                 choices->algo_id = 0xFF00 + id;
 377                                         }
 378                                 }
 379                                 goto choose_ok;
 380                         }
 381                         break;
 382                 case BR_SSLKEYX_ECDHE_ECDSA:
 383                         if (pc->sk->key_type == BR_KEYTYPE_EC) {
 384                                 choices->cipher_suite = st[u][0];
 385                                 if (br_ssl_engine_get_version(&cc->eng)
 386                                         < BR_TLS12)
 387                                 {
 388                                         if (pc->cbhash) {
 389                                                 choices->algo_id = 0x0203;
 390                                         } else {
 391                                                 choices->algo_id =
 392                                                         0xFF00 + br_sha1_ID;
 393                                         }
 394                                 } else {
 395                                         unsigned id;
 396
 397                                         id = choose_hash(chashes >> 8);
 398                                         if (pc->cbhash) {
 399                                                 choices->algo_id =
 400                                                         (id << 8) + 0x03;
 401                                         } else {
 402                                                 choices->algo_id =
 403                                                         0xFF00 + id;
 404                                         }
 405                                 }
 406                                 goto choose_ok;
 407                         }
 408                         break;
 409                 case BR_SSLKEYX_ECDH_RSA:
 410                         if (pc->sk->key_type == BR_KEYTYPE_EC
 411                                 && pc->cert_signer_algo == BR_KEYTYPE_RSA)
 412                         {
 413                                 choices->cipher_suite = st[u][0];
 414                                 goto choose_ok;
 415                         }
 416                         break;
 417                 case BR_SSLKEYX_ECDH_ECDSA:
 418                         if (pc->sk->key_type == BR_KEYTYPE_EC
 419                                 && pc->cert_signer_algo == BR_KEYTYPE_EC)
 420                         {
 421                                 choices->cipher_suite = st[u][0];
 422                                 goto choose_ok;
 423                         }
 424                         break;
 425                 }
 426         }
 427         return 0;
 428
 429 choose_ok:
 430         choices->chain = pc->chain;
 431         choices->chain_len = pc->chain_len;
 432         if (pc->verbose) {
 433                 char csn[80];
 434
 435                 get_suite_name_ext(choices->cipher_suite, csn, sizeof csn);
 436                 fprintf(stderr, "Using: %s\n", csn);
 437         }
 438         return 1;
 439 }
 440
 441 static uint32_t
 442 sp_do_keyx(const br_ssl_server_policy_class **pctx,
 443         unsigned char *data, size_t len)
 444 {
 445         policy_context *pc;
 446
 447         pc = (policy_context *)pctx;
 448         switch (pc->sk->key_type) {
 449         case BR_KEYTYPE_RSA:
 450                 return br_rsa_ssl_decrypt(
 451                         &br_rsa_i31_private, &pc->sk->key.rsa,
 452                         data, len);
 453         case BR_KEYTYPE_EC:
 454                 return br_ec_prime_i31.mul(data, len, pc->sk->key.ec.x,
 455                         pc->sk->key.ec.xlen, pc->sk->key.ec.curve);
 456         default:
 457                 fprintf(stderr, "ERROR: unknown private key type (%d)\n",
 458                         (int)pc->sk->key_type);
 459                 return 0;
 460         }
 461 }
 462
 463 static size_t
 464 sp_do_sign(const br_ssl_server_policy_class **pctx,
 465         unsigned algo_id, unsigned char *data, size_t hv_len, size_t len)
 466 {
 467         policy_context *pc;
 468         unsigned char hv[64];
 469
 470         pc = (policy_context *)pctx;
 471         if (algo_id >= 0xFF00) {
 472                 algo_id &= 0xFF;
 473                 memcpy(hv, data, hv_len);
 474         } else {
 475                 const br_hash_class *hc;
 476                 br_hash_compat_context zc;
 477
 478                 if (pc->verbose) {
 479                         fprintf(stderr, "Callback hashing, algo = 0x%04X,"
 480                                 " data_len = %lu\n",
 481                                 algo_id, (unsigned long)hv_len);
 482                 }
 483                 algo_id >>= 8;
 484                 hc = get_hash_impl(algo_id);
 485                 if (hc == NULL) {
 486                         if (pc->verbose) {
 487                                 fprintf(stderr,
 488                                         "ERROR: unsupported hash function %u\n",
 489                                         algo_id);
 490                         }
 491                         return 0;
 492                 }
 493                 hc->init(&zc.vtable);
 494                 hc->update(&zc.vtable, data, hv_len);
 495                 hc->out(&zc.vtable, hv);
 496                 hv_len = (hc->desc >> BR_HASHDESC_OUT_OFF)
 497                         & BR_HASHDESC_OUT_MASK;
 498         }
 499         switch (pc->sk->key_type) {
 500                 size_t sig_len;
 501                 uint32_t x;
 502                 const unsigned char *hash_oid;
 503                 const br_hash_class *hc;
 504
 505         case BR_KEYTYPE_RSA:
 506                 hash_oid = get_hash_oid(algo_id);
 507                 if (hash_oid == NULL && algo_id != 0) {
 508                         if (pc->verbose) {
 509                                 fprintf(stderr, "ERROR: cannot RSA-sign with"
 510                                         " unknown hash function: %u\n",
 511                                         algo_id);
 512                         }
 513                         return 0;
 514                 }
 515                 sig_len = (pc->sk->key.rsa.n_bitlen + 7) >> 3;
 516                 if (len < sig_len) {
 517                         if (pc->verbose) {
 518                                 fprintf(stderr, "ERROR: cannot RSA-sign,"
 519                                         " buffer is too small"
 520                                         " (sig=%lu, buf=%lu)\n",
 521                                         (unsigned long)sig_len,
 522                                         (unsigned long)len);
 523                         }
 524                         return 0;
 525                 }
 526                 x = br_rsa_i31_pkcs1_sign(hash_oid, hv, hv_len,
 527                         &pc->sk->key.rsa, data);
 528                 if (!x) {
 529                         if (pc->verbose) {
 530                                 fprintf(stderr, "ERROR: RSA-sign failure\n");
 531                         }
 532                         return 0;
 533                 }
 534                 return sig_len;
 535
 536         case BR_KEYTYPE_EC:
 537                 hc = get_hash_impl(algo_id);
 538                 if (hc == NULL) {
 539                         if (pc->verbose) {
 540                                 fprintf(stderr, "ERROR: cannot ECDSA-sign with"
 541                                         " unknown hash function: %u\n",
 542                                         algo_id);
 543                         }
 544                         return 0;
 545                 }
 546                 if (len < 139) {
 547                         if (pc->verbose) {
 548                                 fprintf(stderr, "ERROR: cannot ECDSA-sign"
 549                                         " (output buffer = %lu)\n",
 550                                         (unsigned long)len);
 551                         }
 552                         return 0;
 553                 }
 554                 sig_len = br_ecdsa_i31_sign_asn1(&br_ec_prime_i31,
 555                         hc, hv, &pc->sk->key.ec, data);
 556                 if (sig_len == 0) {
 557                         if (pc->verbose) {
 558                                 fprintf(stderr, "ERROR: ECDSA-sign failure\n");
 559                         }
 560                         return 0;
 561                 }
 562                 return sig_len;
 563
 564         default:
 565                 return 0;
 566         }
 567 }
 568
 569 static const br_ssl_server_policy_class policy_vtable = {
 570         sizeof(policy_context),
 571         sp_choose,
 572         sp_do_keyx,
 573         sp_do_sign
 574 };
 575
 576 void
 577 free_alpn(void *alpn)
 578 {
 579         xfree(*(char **)alpn);
 580 }
 581
 582 /* see brssl.h */
 583 int
 584 do_server(int argc, char *argv[])
 585 {
 586         int retcode;
 587         int verbose;
 588         int trace;
 589         int i, bidi;
 590         const char *bind_name;
 591         const char *port;
 592         unsigned vmin, vmax;
 593         cipher_suite *suites;
 594         size_t num_suites;
 595         uint16_t *suite_ids;
 596         unsigned hfuns;
 597         int cbhash;
 598         br_x509_certificate *chain;
 599         size_t chain_len;
 600         int cert_signer_algo;
 601         private_key *sk;
 602         anchor_list anchors = VEC_INIT;
 603         VECTOR(const char *) alpn_names = VEC_INIT;
 604         br_x509_minimal_context xc;
 605         const br_hash_class *dnhash;
 606         size_t u;
 607         br_ssl_server_context cc;
 608         policy_context pc;
 609         br_ssl_session_cache_lru lru;
 610         unsigned char *iobuf, *cache;
 611         size_t iobuf_len, cache_len;
 612         uint32_t flags;
 613         int server_fd, fd;
 614
 615         retcode = 0;
 616         verbose = 1;
 617         trace = 0;
 618         bind_name = NULL;
 619         port = NULL;
 620         bidi = 1;
 621         vmin = 0;
 622         vmax = 0;
 623         suites = NULL;
 624         num_suites = 0;
 625         hfuns = 0;
 626         cbhash = 0;
 627         suite_ids = NULL;
 628         chain = NULL;
 629         chain_len = 0;
 630         sk = NULL;
 631         iobuf = NULL;
 632         iobuf_len = 0;
 633         cache = NULL;
 634         cache_len = (size_t)-1;
 635         flags = 0;
 636         server_fd = -1;
 637         fd = -1;
 638         for (i = 0; i < argc; i ++) {
 639                 const char *arg;
 640
 641                 arg = argv[i];
 642                 if (arg[0] != '-') {
 643                         usage_server();
 644                         goto server_exit_error;
 645                 }
 646                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 647                         verbose = 1;
 648                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 649                         verbose = 0;
 650                 } else if (eqstr(arg, "-trace")) {
 651                         trace = 1;
 652                 } else if (eqstr(arg, "-b")) {
 653                         if (++ i >= argc) {
 654                                 fprintf(stderr,
 655                                         "ERROR: no argument for '-b'\n");
 656                                 usage_server();
 657                                 goto server_exit_error;
 658                         }
 659                         if (bind_name != NULL) {
 660                                 fprintf(stderr, "ERROR: duplicate bind host\n");
 661                                 usage_server();
 662                                 goto server_exit_error;
 663                         }
 664                         bind_name = argv[i];
 665                 } else if (eqstr(arg, "-p")) {
 666                         if (++ i >= argc) {
 667                                 fprintf(stderr,
 668                                         "ERROR: no argument for '-p'\n");
 669                                 usage_server();
 670                                 goto server_exit_error;
 671                         }
 672                         if (port != NULL) {
 673                                 fprintf(stderr, "ERROR: duplicate bind port\n");
 674                                 usage_server();
 675                                 goto server_exit_error;
 676                         }
 677                         port = argv[i];
 678                 } else if (eqstr(arg, "-mono")) {
 679                         bidi = 0;
 680                 } else if (eqstr(arg, "-buf")) {
 681                         if (++ i >= argc) {
 682                                 fprintf(stderr,
 683                                         "ERROR: no argument for '-buf'\n");
 684                                 usage_server();
 685                                 goto server_exit_error;
 686                         }
 687                         arg = argv[i];
 688                         if (iobuf_len != 0) {
 689                                 fprintf(stderr,
 690                                         "ERROR: duplicate I/O buffer length\n");
 691                                 usage_server();
 692                                 goto server_exit_error;
 693                         }
 694                         iobuf_len = parse_size(arg);
 695                         if (iobuf_len == (size_t)-1) {
 696                                 usage_server();
 697                                 goto server_exit_error;
 698                         }
 699                 } else if (eqstr(arg, "-cache")) {
 700                         if (++ i >= argc) {
 701                                 fprintf(stderr,
 702                                         "ERROR: no argument for '-cache'\n");
 703                                 usage_server();
 704                                 goto server_exit_error;
 705                         }
 706                         arg = argv[i];
 707                         if (cache_len != (size_t)-1) {
 708                                 fprintf(stderr, "ERROR: duplicate session"
 709                                         " cache length\n");
 710                                 usage_server();
 711                                 goto server_exit_error;
 712                         }
 713                         cache_len = parse_size(arg);
 714                         if (cache_len == (size_t)-1) {
 715                                 usage_server();
 716                                 goto server_exit_error;
 717                         }
 718                 } else if (eqstr(arg, "-cert")) {
 719                         if (++ i >= argc) {
 720                                 fprintf(stderr,
 721                                         "ERROR: no argument for '-cert'\n");
 722                                 usage_server();
 723                                 goto server_exit_error;
 724                         }
 725                         if (chain != NULL) {
 726                                 fprintf(stderr,
 727                                         "ERROR: duplicate certificate chain\n");
 728                                 usage_server();
 729                                 goto server_exit_error;
 730                         }
 731                         arg = argv[i];
 732                         chain = read_certificates(arg, &chain_len);
 733                         if (chain == NULL || chain_len == 0) {
 734                                 goto server_exit_error;
 735                         }
 736                 } else if (eqstr(arg, "-key")) {
 737                         if (++ i >= argc) {
 738                                 fprintf(stderr,
 739                                         "ERROR: no argument for '-key'\n");
 740                                 usage_server();
 741                                 goto server_exit_error;
 742                         }
 743                         if (sk != NULL) {
 744                                 fprintf(stderr,
 745                                         "ERROR: duplicate private key\n");
 746                                 usage_server();
 747                                 goto server_exit_error;
 748                         }
 749                         arg = argv[i];
 750                         sk = read_private_key(arg);
 751                         if (sk == NULL) {
 752                                 goto server_exit_error;
 753                         }
 754                 } else if (eqstr(arg, "-CA")) {
 755                         if (++ i >= argc) {
 756                                 fprintf(stderr,
 757                                         "ERROR: no argument for '-CA'\n");
 758                                 usage_server();
 759                                 goto server_exit_error;
 760                         }
 761                         arg = argv[i];
 762                         if (read_trust_anchors(&anchors, arg) == 0) {
 763                                 usage_server();
 764                                 goto server_exit_error;
 765                         }
 766                 } else if (eqstr(arg, "-anon_ok")) {
 767                         flags |= BR_OPT_TOLERATE_NO_CLIENT_AUTH;
 768                 } else if (eqstr(arg, "-list")) {
 769                         list_names();
 770                         goto server_exit;
 771                 } else if (eqstr(arg, "-vmin")) {
 772                         if (++ i >= argc) {
 773                                 fprintf(stderr,
 774                                         "ERROR: no argument for '-vmin'\n");
 775                                 usage_server();
 776                                 goto server_exit_error;
 777                         }
 778                         arg = argv[i];
 779                         if (vmin != 0) {
 780                                 fprintf(stderr,
 781                                         "ERROR: duplicate minimum version\n");
 782                                 usage_server();
 783                                 goto server_exit_error;
 784                         }
 785                         vmin = parse_version(arg, strlen(arg));
 786                         if (vmin == 0) {
 787                                 fprintf(stderr,
 788                                         "ERROR: unrecognised version '%s'\n",
 789                                         arg);
 790                                 usage_server();
 791                                 goto server_exit_error;
 792                         }
 793                 } else if (eqstr(arg, "-vmax")) {
 794                         if (++ i >= argc) {
 795                                 fprintf(stderr,
 796                                         "ERROR: no argument for '-vmax'\n");
 797                                 usage_server();
 798                                 goto server_exit_error;
 799                         }
 800                         arg = argv[i];
 801                         if (vmax != 0) {
 802                                 fprintf(stderr,
 803                                         "ERROR: duplicate maximum version\n");
 804                                 usage_server();
 805                                 goto server_exit_error;
 806                         }
 807                         vmax = parse_version(arg, strlen(arg));
 808                         if (vmax == 0) {
 809                                 fprintf(stderr,
 810                                         "ERROR: unrecognised version '%s'\n",
 811                                         arg);
 812                                 usage_server();
 813                                 goto server_exit_error;
 814                         }
 815                 } else if (eqstr(arg, "-cs")) {
 816                         if (++ i >= argc) {
 817                                 fprintf(stderr,
 818                                         "ERROR: no argument for '-cs'\n");
 819                                 usage_server();
 820                                 goto server_exit_error;
 821                         }
 822                         arg = argv[i];
 823                         if (suites != NULL) {
 824                                 fprintf(stderr, "ERROR: duplicate list"
 825                                         " of cipher suites\n");
 826                                 usage_server();
 827                                 goto server_exit_error;
 828                         }
 829                         suites = parse_suites(arg, &num_suites);
 830                         if (suites == NULL) {
 831                                 usage_server();
 832                                 goto server_exit_error;
 833                         }
 834                 } else if (eqstr(arg, "-hf")) {
 835                         unsigned x;
 836
 837                         if (++ i >= argc) {
 838                                 fprintf(stderr,
 839                                         "ERROR: no argument for '-hf'\n");
 840                                 usage_server();
 841                                 goto server_exit_error;
 842                         }
 843                         arg = argv[i];
 844                         x = parse_hash_functions(arg);
 845                         if (x == 0) {
 846                                 usage_server();
 847                                 goto server_exit_error;
 848                         }
 849                         hfuns |= x;
 850                 } else if (eqstr(arg, "-cbhash")) {
 851                         cbhash = 1;
 852                 } else if (eqstr(arg, "-serverpref")) {
 853                         flags |= BR_OPT_ENFORCE_SERVER_PREFERENCES;
 854                 } else if (eqstr(arg, "-noreneg")) {
 855                         flags |= BR_OPT_NO_RENEGOTIATION;
 856                 } else if (eqstr(arg, "-alpn")) {
 857                         if (++ i >= argc) {
 858                                 fprintf(stderr,
 859                                         "ERROR: no argument for '-alpn'\n");
 860                                 usage_server();
 861                                 goto server_exit_error;
 862                         }
 863                         VEC_ADD(alpn_names, xstrdup(argv[i]));
 864                 } else if (eqstr(arg, "-strictalpn")) {
 865                         flags |= BR_OPT_FAIL_ON_ALPN_MISMATCH;
 866                 } else {
 867                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 868                         usage_server();
 869                         goto server_exit_error;
 870                 }
 871         }
 872         if (port == NULL) {
 873                 port = "4433";
 874         }
 875         if (vmin == 0) {
 876                 vmin = BR_TLS10;
 877         }
 878         if (vmax == 0) {
 879                 vmax = BR_TLS12;
 880         }
 881         if (vmax < vmin) {
 882                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 883                         " version combination\n");
 884                 usage_server();
 885                 goto server_exit_error;
 886         }
 887         if (suites == NULL) {
 888                 num_suites = 0;
 889
 890                 for (u = 0; cipher_suites[u].name; u ++) {
 891                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 892                                 || vmax >= BR_TLS12)
 893                         {
 894                                 num_suites ++;
 895                         }
 896                 }
 897                 suites = xmalloc(num_suites * sizeof *suites);
 898                 num_suites = 0;
 899                 for (u = 0; cipher_suites[u].name; u ++) {
 900                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 901                                 || vmax >= BR_TLS12)
 902                         {
 903                                 suites[num_suites ++] = cipher_suites[u];
 904                         }
 905                 }
 906         }
 907         if (hfuns == 0) {
 908                 hfuns = (unsigned)-1;
 909         }
 910         if (chain == NULL || chain_len == 0) {
 911                 fprintf(stderr, "ERROR: no certificate chain provided\n");
 912                 goto server_exit_error;
 913         }
 914         if (sk == NULL) {
 915                 fprintf(stderr, "ERROR: no private key provided\n");
 916                 goto server_exit_error;
 917         }
 918         switch (sk->key_type) {
 919                 int curve;
 920                 uint32_t supp;
 921
 922         case BR_KEYTYPE_RSA:
 923                 break;
 924         case BR_KEYTYPE_EC:
 925                 curve = sk->key.ec.curve;
 926                 supp = br_ec_prime_i31.supported_curves;
 927                 if (curve > 31 || !((supp >> curve) & 1)) {
 928                         fprintf(stderr, "ERROR: private key curve (%d)"
 929                                 " is not supported\n", curve);
 930                         goto server_exit_error;
 931                 }
 932                 break;
 933         default:
 934                 fprintf(stderr, "ERROR: unsupported private key type (%d)\n",
 935                         sk->key_type);
 936                 break;
 937         }
 938         cert_signer_algo = get_cert_signer_algo(chain);
 939         if (cert_signer_algo == 0) {
 940                 goto server_exit_error;
 941         }
 942         if (verbose) {
 943                 const char *csas;
 944
 945                 switch (cert_signer_algo) {
 946                 case BR_KEYTYPE_RSA: csas = "RSA"; break;
 947                 case BR_KEYTYPE_EC:  csas = "EC"; break;
 948                 default:
 949                         csas = "unknown";
 950                         break;
 951                 }
 952                 fprintf(stderr, "Issuing CA key type: %d (%s)\n",
 953                         cert_signer_algo, csas);
 954         }
 955         if (iobuf_len == 0) {
 956                 if (bidi) {
 957                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 958                 } else {
 959                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 960                 }
 961         }
 962         iobuf = xmalloc(iobuf_len);
 963         if (cache_len == (size_t)-1) {
 964                 cache_len = 5000;
 965         }
 966         cache = xmalloc(cache_len);
 967
 968         /*
 969          * Compute implementation requirements and inject implementations.
 970          */
 971         suite_ids = xmalloc(num_suites * sizeof *suite_ids);
 972         br_ssl_server_zero(&cc);
 973         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 974         br_ssl_engine_set_all_flags(&cc.eng, flags);
 975         if (vmin <= BR_TLS11) {
 976                 if (!(hfuns & (1 << br_md5_ID))) {
 977                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 978                         goto server_exit_error;
 979                 }
 980                 if (!(hfuns & (1 << br_sha1_ID))) {
 981                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 982                         goto server_exit_error;
 983                 }
 984         }
 985         for (u = 0; u < num_suites; u ++) {
 986                 unsigned req;
 987
 988                 req = suites[u].req;
 989                 suite_ids[u] = suites[u].suite;
 990                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 991                         fprintf(stderr,
 992                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 993                                 suites[u].name);
 994                         goto server_exit_error;
 995                 }
 996                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 997                         fprintf(stderr,
 998                                 "ERROR: cipher suite %s requires SHA-1\n",
 999                                 suites[u].name);
1000                         goto server_exit_error;
1001                 }
1002                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
1003                         fprintf(stderr,
1004                                 "ERROR: cipher suite %s requires SHA-256\n",
1005                                 suites[u].name);
1006                         goto server_exit_error;
1007                 }
1008                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
1009                         fprintf(stderr,
1010                                 "ERROR: cipher suite %s requires SHA-384\n",
1011                                 suites[u].name);
1012                         goto server_exit_error;
1013                 }
1014                 /* TODO: algorithm implementation selection */
1015                 if ((req & REQ_AESCBC) != 0) {
1016                         br_ssl_engine_set_aes_cbc(&cc.eng,
1017                                 &br_aes_ct_cbcenc_vtable,
1018                                 &br_aes_ct_cbcdec_vtable);
1019                         br_ssl_engine_set_cbc(&cc.eng,
1020                                 &br_sslrec_in_cbc_vtable,
1021                                 &br_sslrec_out_cbc_vtable);
1022                 }
1023                 if ((req & REQ_AESGCM) != 0) {
1024                         br_ssl_engine_set_aes_ctr(&cc.eng,
1025                                 &br_aes_ct_ctr_vtable);
1026                         br_ssl_engine_set_ghash(&cc.eng,
1027                                 &br_ghash_ctmul);
1028                         br_ssl_engine_set_gcm(&cc.eng,
1029                                 &br_sslrec_in_gcm_vtable,
1030                                 &br_sslrec_out_gcm_vtable);
1031                 }
1032                 if ((req & REQ_CHAPOL) != 0) {
1033                         br_ssl_engine_set_chacha20(&cc.eng,
1034                                 &br_chacha20_ct_run);
1035                         br_ssl_engine_set_poly1305(&cc.eng,
1036                                 &br_poly1305_ctmul_run);
1037                         br_ssl_engine_set_chapol(&cc.eng,
1038                                 &br_sslrec_in_chapol_vtable,
1039                                 &br_sslrec_out_chapol_vtable);
1040                 }
1041                 if ((req & REQ_3DESCBC) != 0) {
1042                         br_ssl_engine_set_des_cbc(&cc.eng,
1043                                 &br_des_ct_cbcenc_vtable,
1044                                 &br_des_ct_cbcdec_vtable);
1045                         br_ssl_engine_set_cbc(&cc.eng,
1046                                 &br_sslrec_in_cbc_vtable,
1047                                 &br_sslrec_out_cbc_vtable);
1048                 }
1049                 if ((req & (REQ_ECDHE_RSA | REQ_ECDHE_ECDSA)) != 0) {
1050                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
1051                 }
1052         }
1053         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
1054
1055         dnhash = NULL;
1056         for (u = 0; hash_functions[u].name; u ++) {
1057                 const br_hash_class *hc;
1058                 int id;
1059
1060                 hc = hash_functions[u].hclass;
1061                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
1062                 if ((hfuns & ((unsigned)1 << id)) != 0) {
1063                         dnhash = hc;
1064                         br_ssl_engine_set_hash(&cc.eng, id, hc);
1065                 }
1066         }
1067         if (vmin <= BR_TLS11) {
1068                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
1069         }
1070         if (vmax >= BR_TLS12) {
1071                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
1072                         br_ssl_engine_set_prf_sha256(&cc.eng,
1073                                 &br_tls12_sha256_prf);
1074                 }
1075                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
1076                         br_ssl_engine_set_prf_sha384(&cc.eng,
1077                                 &br_tls12_sha384_prf);
1078                 }
1079         }
1080
1081         br_ssl_session_cache_lru_init(&lru, cache, cache_len);
1082         br_ssl_server_set_cache(&cc, &lru.vtable);
1083
1084         if (VEC_LEN(alpn_names) != 0) {
1085                 br_ssl_engine_set_protocol_names(&cc.eng,
1086                         &VEC_ELT(alpn_names, 0), VEC_LEN(alpn_names));
1087         }
1088
1089         /*
1090          * Set the policy handler (that chooses the actual cipher suite,
1091          * selects the certificate chain, and runs the private key
1092          * operations).
1093          */
1094         pc.vtable = &policy_vtable;
1095         pc.verbose = verbose;
1096         pc.chain = chain;
1097         pc.chain_len = chain_len;
1098         pc.cert_signer_algo = cert_signer_algo;
1099         pc.sk = sk;
1100         pc.cbhash = cbhash;
1101         br_ssl_server_set_policy(&cc, &pc.vtable);
1102
1103         /*
1104          * If trust anchors have been configured, then set an X.509
1105          * validation engine and activate client certificate
1106          * authentication.
1107          */
1108         if (VEC_LEN(anchors) != 0) {
1109                 br_x509_minimal_init(&xc, dnhash,
1110                         &VEC_ELT(anchors, 0), VEC_LEN(anchors));
1111                 for (u = 0; hash_functions[u].name; u ++) {
1112                         const br_hash_class *hc;
1113                         int id;
1114
1115                         hc = hash_functions[u].hclass;
1116                         id = (hc->desc >> BR_HASHDESC_ID_OFF)
1117                                 & BR_HASHDESC_ID_MASK;
1118                         if ((hfuns & ((unsigned)1 << id)) != 0) {
1119                                 br_x509_minimal_set_hash(&xc, id, hc);
1120                         }
1121                 }
1122                 br_ssl_engine_set_rsavrfy(&cc.eng, &br_rsa_i31_pkcs1_vrfy);
1123                 br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
1124                 br_ssl_engine_set_ecdsa(&cc.eng, &br_ecdsa_i31_vrfy_asn1);
1125                 br_x509_minimal_set_rsa(&xc, &br_rsa_i31_pkcs1_vrfy);
1126                 br_x509_minimal_set_ecdsa(&xc,
1127                         &br_ec_prime_i31, &br_ecdsa_i31_vrfy_asn1);
1128                 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
1129                 br_ssl_server_set_trust_anchor_names_alt(&cc,
1130                         &VEC_ELT(anchors, 0), VEC_LEN(anchors));
1131         }
1132
1133         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
1134
1135         /*
1136          * We need to ignore SIGPIPE.
1137          */
1138         signal(SIGPIPE, SIG_IGN);
1139
1140         /*
1141          * Open the server socket.
1142          */
1143         server_fd = host_bind(bind_name, port, verbose);
1144         if (server_fd < 0) {
1145                 goto server_exit_error;
1146         }
1147
1148         /*
1149          * Process incoming clients, one at a time. Note that we do not
1150          * accept any client until the previous connection has finished:
1151          * this is voluntary, since the tool uses stdin/stdout for
1152          * application data, and thus cannot really run two connections
1153          * simultaneously.
1154          */
1155         for (;;) {
1156                 int x;
1157
1158                 fd = accept_client(server_fd, verbose);
1159                 if (fd < 0) {
1160                         goto server_exit_error;
1161                 }
1162                 br_ssl_server_reset(&cc);
1163                 x = run_ssl_engine(&cc.eng, fd,
1164                         (verbose ? RUN_ENGINE_VERBOSE : 0)
1165                         | (trace ? RUN_ENGINE_TRACE : 0));
1166                 close(fd);
1167                 fd = -1;
1168                 if (x < -1) {
1169                         goto server_exit_error;
1170                 }
1171         }
1172
1173         /*
1174          * Release allocated structures.
1175          */
1176 server_exit:
1177         xfree(suites);
1178         xfree(suite_ids);
1179         free_certificates(chain, chain_len);
1180         free_private_key(sk);
1181         VEC_CLEAREXT(anchors, &free_ta_contents);
1182         VEC_CLEAREXT(alpn_names, &free_alpn);
1183         xfree(iobuf);
1184         xfree(cache);
1185         if (fd >= 0) {
1186                 close(fd);
1187         }
1188         return retcode;
1189
1190 server_exit_error:
1191         retcode = -1;
1192         goto server_exit;
1193 }