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