_ 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 "   -list           list supported names (protocols, algorithms...)\n");
 218         fprintf(stderr,
 219 "   -vmin name      set minimum supported version (default: TLS-1.0)\n");
 220         fprintf(stderr,
 221 "   -vmax name      set maximum supported version (default: TLS-1.2)\n");
 222         fprintf(stderr,
 223 "   -cs names       set list of supported cipher suites (comma-separated)\n");
 224         fprintf(stderr,
 225 "   -hf names       add support for some hash functions (comma-separated)\n");
 226         fprintf(stderr,
 227 "   -serverpref     enforce server's preferences for cipher suites\n");
 228         exit(EXIT_FAILURE);
 229 }
 230
 231 typedef struct {
 232         const br_ssl_server_policy_class *vtable;
 233         int verbose;
 234         br_x509_certificate *chain;
 235         size_t chain_len;
 236         int cert_signer_algo;
 237         private_key *sk;
 238 } policy_context;
 239
 240 static int
 241 get_cert_signer_algo(br_x509_certificate *xc)
 242 {
 243         br_x509_decoder_context dc;
 244         int err;
 245
 246         br_x509_decoder_init(&dc, 0, 0);
 247         br_x509_decoder_push(&dc, xc->data, xc->data_len);
 248         err = br_x509_decoder_last_error(&dc);
 249         if (err != 0) {
 250                 return -err;
 251         } else {
 252                 return br_x509_decoder_get_signer_key_type(&dc);
 253         }
 254 }
 255
 256 static int
 257 sp_choose(const br_ssl_server_policy_class **pctx,
 258         const br_ssl_server_context *cc,
 259         br_ssl_server_choices *choices)
 260 {
 261         policy_context *pc;
 262         const br_suite_translated *st;
 263         size_t u, st_num;
 264         unsigned chashes;
 265         int hash_id;
 266
 267         pc = (policy_context *)pctx;
 268         st = br_ssl_server_get_client_suites(cc, &st_num);
 269         chashes = br_ssl_server_get_client_hashes(cc);
 270         for (hash_id = 6; hash_id >= 2; hash_id --) {
 271                 if ((chashes >> hash_id) & 1) {
 272                         break;
 273                 }
 274         }
 275         if (pc->verbose) {
 276                 fprintf(stderr, "Client parameters:\n");
 277                 fprintf(stderr, "   Maximum version:      ");
 278                 switch (cc->client_max_version) {
 279                 case BR_SSL30:
 280                         fprintf(stderr, "SSL 3.0");
 281                         break;
 282                 case BR_TLS10:
 283                         fprintf(stderr, "TLS 1.0");
 284                         break;
 285                 case BR_TLS11:
 286                         fprintf(stderr, "TLS 1.1");
 287                         break;
 288                 case BR_TLS12:
 289                         fprintf(stderr, "TLS 1.2");
 290                         break;
 291                 default:
 292                         fprintf(stderr, "unknown (0x%04X)",
 293                                 (unsigned)cc->client_max_version);
 294                         break;
 295                 }
 296                 fprintf(stderr, "\n");
 297                 fprintf(stderr, "   Compatible cipher suites:\n");
 298                 for (u = 0; u < st_num; u ++) {
 299                         char csn[80];
 300
 301                         get_suite_name_ext(st[u][0], csn, sizeof csn);
 302                         fprintf(stderr, "      %s\n", csn);
 303                 }
 304                 fprintf(stderr, "   Common hash functions:");
 305                 for (u = 2; u <= 6; u ++) {
 306                         if ((chashes >> u) & 1) {
 307                                 int z;
 308
 309                                 switch (u) {
 310                                 case 3: z = 224; break;
 311                                 case 4: z = 256; break;
 312                                 case 5: z = 384; break;
 313                                 case 6: z = 512; break;
 314                                 default:
 315                                         z = 1;
 316                                         break;
 317                                 }
 318                                 fprintf(stderr, " sha%d", z);
 319                         }
 320                 }
 321                 fprintf(stderr, "\n");
 322         }
 323         for (u = 0; u < st_num; u ++) {
 324                 unsigned tt;
 325
 326                 tt = st[u][1];
 327                 switch (tt >> 12) {
 328                 case BR_SSLKEYX_RSA:
 329                         if (pc->sk->key_type == BR_KEYTYPE_RSA) {
 330                                 choices->cipher_suite = st[u][0];
 331                                 goto choose_ok;
 332                         }
 333                         break;
 334                 case BR_SSLKEYX_ECDHE_RSA:
 335                         if (pc->sk->key_type == BR_KEYTYPE_RSA) {
 336                                 choices->cipher_suite = st[u][0];
 337                                 if (cc->eng.session.version < BR_TLS12) {
 338                                         hash_id = 0;
 339                                 }
 340                                 choices->hash_id = hash_id;
 341                                 goto choose_ok;
 342                         }
 343                         break;
 344                 case BR_SSLKEYX_ECDHE_ECDSA:
 345                         if (pc->sk->key_type == BR_KEYTYPE_EC) {
 346                                 choices->cipher_suite = st[u][0];
 347                                 if (cc->eng.session.version < BR_TLS12) {
 348                                         hash_id = br_sha1_ID;
 349                                 }
 350                                 choices->hash_id = hash_id;
 351                                 goto choose_ok;
 352                         }
 353                         break;
 354                 case BR_SSLKEYX_ECDH_RSA:
 355                         if (pc->sk->key_type == BR_KEYTYPE_EC
 356                                 && pc->cert_signer_algo == BR_KEYTYPE_RSA)
 357                         {
 358                                 choices->cipher_suite = st[u][0];
 359                                 goto choose_ok;
 360                         }
 361                         break;
 362                 case BR_SSLKEYX_ECDH_ECDSA:
 363                         if (pc->sk->key_type == BR_KEYTYPE_EC
 364                                 && pc->cert_signer_algo == BR_KEYTYPE_EC)
 365                         {
 366                                 choices->cipher_suite = st[u][0];
 367                                 goto choose_ok;
 368                         }
 369                         break;
 370                 }
 371         }
 372         return 0;
 373
 374 choose_ok:
 375         choices->chain = pc->chain;
 376         choices->chain_len = pc->chain_len;
 377         if (pc->verbose) {
 378                 char csn[80];
 379
 380                 get_suite_name_ext(choices->cipher_suite, csn, sizeof csn);
 381                 fprintf(stderr, "Using: %s\n", csn);
 382         }
 383         return 1;
 384 }
 385
 386 static uint32_t
 387 sp_do_keyx(const br_ssl_server_policy_class **pctx,
 388         unsigned char *data, size_t len)
 389 {
 390         policy_context *pc;
 391
 392         pc = (policy_context *)pctx;
 393         switch (pc->sk->key_type) {
 394         case BR_KEYTYPE_RSA:
 395                 return br_rsa_ssl_decrypt(
 396                         &br_rsa_i31_private, &pc->sk->key.rsa,
 397                         data, len);
 398         case BR_KEYTYPE_EC:
 399                 return br_ec_prime_i31.mul(data, len, pc->sk->key.ec.x,
 400                         pc->sk->key.ec.xlen, pc->sk->key.ec.curve);
 401         default:
 402                 fprintf(stderr, "ERROR: unknown private key type (%d)\n",
 403                         (int)pc->sk->key_type);
 404                 return 0;
 405         }
 406 }
 407
 408 /*
 409  * OID for hash functions in RSA signatures.
 410  */
 411 static const unsigned char HASH_OID_SHA1[] = {
 412         0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A
 413 };
 414
 415 static const unsigned char HASH_OID_SHA224[] = {
 416         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04
 417 };
 418
 419 static const unsigned char HASH_OID_SHA256[] = {
 420         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01
 421 };
 422
 423 static const unsigned char HASH_OID_SHA384[] = {
 424         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02
 425 };
 426
 427 static const unsigned char HASH_OID_SHA512[] = {
 428         0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03
 429 };
 430
 431 static const unsigned char *HASH_OID[] = {
 432         HASH_OID_SHA1,
 433         HASH_OID_SHA224,
 434         HASH_OID_SHA256,
 435         HASH_OID_SHA384,
 436         HASH_OID_SHA512
 437 };
 438
 439 static const br_hash_class *
 440 get_hash_impl(int hash_id)
 441 {
 442         size_t u;
 443
 444         for (u = 0; hash_functions[u].name; u ++) {
 445                 const br_hash_class *hc;
 446                 int id;
 447
 448                 hc = hash_functions[u].hclass;
 449                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 450                 if (id == hash_id) {
 451                         return hc;
 452                 }
 453         }
 454         return NULL;
 455 }
 456
 457 static size_t
 458 sp_do_sign(const br_ssl_server_policy_class **pctx,
 459         int hash_id, size_t hv_len, unsigned char *data, size_t len)
 460 {
 461         policy_context *pc;
 462         unsigned char hv[64];
 463
 464         pc = (policy_context *)pctx;
 465         memcpy(hv, data, hv_len);
 466         switch (pc->sk->key_type) {
 467                 size_t sig_len;
 468                 uint32_t x;
 469                 const unsigned char *hash_oid;
 470                 const br_hash_class *hc;
 471
 472         case BR_KEYTYPE_RSA:
 473                 if (hash_id == 0) {
 474                         hash_oid = NULL;
 475                 } else if (hash_id >= 2 && hash_id <= 6) {
 476                         hash_oid = HASH_OID[hash_id - 2];
 477                 } else {
 478                         if (pc->verbose) {
 479                                 fprintf(stderr, "ERROR: cannot RSA-sign with"
 480                                         " unknown hash function: %d\n",
 481                                         hash_id);
 482                         }
 483                         return 0;
 484                 }
 485                 sig_len = (pc->sk->key.rsa.n_bitlen + 7) >> 3;
 486                 if (len < sig_len) {
 487                         if (pc->verbose) {
 488                                 fprintf(stderr, "ERROR: cannot RSA-sign,"
 489                                         " buffer is too small"
 490                                         " (sig=%lu, buf=%lu)\n",
 491                                         (unsigned long)sig_len,
 492                                         (unsigned long)len);
 493                         }
 494                         return 0;
 495                 }
 496                 x = br_rsa_i31_pkcs1_sign(hash_oid, hv, hv_len,
 497                         &pc->sk->key.rsa, data);
 498                 if (!x) {
 499                         if (pc->verbose) {
 500                                 fprintf(stderr, "ERROR: RSA-sign failure\n");
 501                         }
 502                         return 0;
 503                 }
 504                 return sig_len;
 505
 506         case BR_KEYTYPE_EC:
 507                 hc = get_hash_impl(hash_id);
 508                 if (hc == NULL) {
 509                         if (pc->verbose) {
 510                                 fprintf(stderr, "ERROR: cannot RSA-sign with"
 511                                         " unknown hash function: %d\n",
 512                                         hash_id);
 513                         }
 514                         return 0;
 515                 }
 516                 if (len < 139) {
 517                         if (pc->verbose) {
 518                                 fprintf(stderr, "ERROR: cannot ECDSA-sign"
 519                                         " (output buffer = %lu)\n",
 520                                         (unsigned long)len);
 521                         }
 522                         return 0;
 523                 }
 524                 sig_len = br_ecdsa_i31_sign_asn1(&br_ec_prime_i31,
 525                         hc, hv, &pc->sk->key.ec, data);
 526                 if (sig_len == 0) {
 527                         if (pc->verbose) {
 528                                 fprintf(stderr, "ERROR: ECDSA-sign failure\n");
 529                         }
 530                         return 0;
 531                 }
 532                 return sig_len;
 533
 534         default:
 535                 return 0;
 536         }
 537 }
 538
 539 static const br_ssl_server_policy_class policy_vtable = {
 540         sizeof(policy_context),
 541         sp_choose,
 542         sp_do_keyx,
 543         sp_do_sign
 544 };
 545
 546 /* see brssl.h */
 547 int
 548 do_server(int argc, char *argv[])
 549 {
 550         int retcode;
 551         int verbose;
 552         int trace;
 553         int i, bidi;
 554         const char *bind_name;
 555         const char *port;
 556         unsigned vmin, vmax;
 557         cipher_suite *suites;
 558         size_t num_suites;
 559         uint16_t *suite_ids;
 560         unsigned hfuns;
 561         br_x509_certificate *chain;
 562         size_t chain_len;
 563         int cert_signer_algo;
 564         private_key *sk;
 565         size_t u;
 566         br_ssl_server_context cc;
 567         policy_context pc;
 568         br_ssl_session_cache_lru lru;
 569         unsigned char *iobuf, *cache;
 570         size_t iobuf_len, cache_len;
 571         uint32_t flags;
 572         int server_fd, fd;
 573
 574         retcode = 0;
 575         verbose = 1;
 576         trace = 0;
 577         bind_name = NULL;
 578         port = NULL;
 579         bidi = 1;
 580         vmin = 0;
 581         vmax = 0;
 582         suites = NULL;
 583         num_suites = 0;
 584         hfuns = 0;
 585         suite_ids = NULL;
 586         chain = NULL;
 587         chain_len = 0;
 588         sk = NULL;
 589         iobuf = NULL;
 590         iobuf_len = 0;
 591         cache = NULL;
 592         cache_len = (size_t)-1;
 593         flags = 0;
 594         server_fd = -1;
 595         fd = -1;
 596         for (i = 0; i < argc; i ++) {
 597                 const char *arg;
 598
 599                 arg = argv[i];
 600                 if (arg[0] != '-') {
 601                         usage_server();
 602                         goto server_exit_error;
 603                 }
 604                 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
 605                         verbose = 1;
 606                 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
 607                         verbose = 0;
 608                 } else if (eqstr(arg, "-trace")) {
 609                         trace = 1;
 610                 } else if (eqstr(arg, "-b")) {
 611                         if (++ i >= argc) {
 612                                 fprintf(stderr,
 613                                         "ERROR: no argument for '-b'\n");
 614                                 usage_server();
 615                                 goto server_exit_error;
 616                         }
 617                         if (bind_name != NULL) {
 618                                 fprintf(stderr, "ERROR: duplicate bind host\n");
 619                                 usage_server();
 620                                 goto server_exit_error;
 621                         }
 622                         bind_name = argv[i];
 623                 } else if (eqstr(arg, "-p")) {
 624                         if (++ i >= argc) {
 625                                 fprintf(stderr,
 626                                         "ERROR: no argument for '-p'\n");
 627                                 usage_server();
 628                                 goto server_exit_error;
 629                         }
 630                         if (port != NULL) {
 631                                 fprintf(stderr, "ERROR: duplicate bind port\n");
 632                                 usage_server();
 633                                 goto server_exit_error;
 634                         }
 635                         port = argv[i];
 636                 } else if (eqstr(arg, "-mono")) {
 637                         bidi = 0;
 638                 } else if (eqstr(arg, "-buf")) {
 639                         if (++ i >= argc) {
 640                                 fprintf(stderr,
 641                                         "ERROR: no argument for '-buf'\n");
 642                                 usage_server();
 643                                 goto server_exit_error;
 644                         }
 645                         arg = argv[i];
 646                         if (iobuf_len != 0) {
 647                                 fprintf(stderr,
 648                                         "ERROR: duplicate I/O buffer length\n");
 649                                 usage_server();
 650                                 goto server_exit_error;
 651                         }
 652                         iobuf_len = parse_size(arg);
 653                         if (iobuf_len == (size_t)-1) {
 654                                 usage_server();
 655                                 goto server_exit_error;
 656                         }
 657                 } else if (eqstr(arg, "-cache")) {
 658                         if (++ i >= argc) {
 659                                 fprintf(stderr,
 660                                         "ERROR: no argument for '-cache'\n");
 661                                 usage_server();
 662                                 goto server_exit_error;
 663                         }
 664                         arg = argv[i];
 665                         if (cache_len != (size_t)-1) {
 666                                 fprintf(stderr, "ERROR: duplicate session"
 667                                         " cache length\n");
 668                                 usage_server();
 669                                 goto server_exit_error;
 670                         }
 671                         cache_len = parse_size(arg);
 672                         if (cache_len == (size_t)-1) {
 673                                 usage_server();
 674                                 goto server_exit_error;
 675                         }
 676                 } else if (eqstr(arg, "-cert")) {
 677                         if (++ i >= argc) {
 678                                 fprintf(stderr,
 679                                         "ERROR: no argument for '-cert'\n");
 680                                 usage_server();
 681                                 goto server_exit_error;
 682                         }
 683                         if (chain != NULL) {
 684                                 fprintf(stderr,
 685                                         "ERROR: duplicate certificate chain\n");
 686                                 usage_server();
 687                                 goto server_exit_error;
 688                         }
 689                         arg = argv[i];
 690                         chain = read_certificates(arg, &chain_len);
 691                         if (chain == NULL || chain_len == 0) {
 692                                 goto server_exit_error;
 693                         }
 694                 } else if (eqstr(arg, "-key")) {
 695                         if (++ i >= argc) {
 696                                 fprintf(stderr,
 697                                         "ERROR: no argument for '-key'\n");
 698                                 usage_server();
 699                                 goto server_exit_error;
 700                         }
 701                         if (sk != NULL) {
 702                                 fprintf(stderr,
 703                                         "ERROR: duplicate private key\n");
 704                                 usage_server();
 705                                 goto server_exit_error;
 706                         }
 707                         arg = argv[i];
 708                         sk = read_private_key(arg);
 709                         if (sk == NULL) {
 710                                 goto server_exit_error;
 711                         }
 712                 } else if (eqstr(arg, "-list")) {
 713                         list_names();
 714                         goto server_exit;
 715                 } else if (eqstr(arg, "-vmin")) {
 716                         if (++ i >= argc) {
 717                                 fprintf(stderr,
 718                                         "ERROR: no argument for '-vmin'\n");
 719                                 usage_server();
 720                                 goto server_exit_error;
 721                         }
 722                         arg = argv[i];
 723                         if (vmin != 0) {
 724                                 fprintf(stderr,
 725                                         "ERROR: duplicate minimum version\n");
 726                                 usage_server();
 727                                 goto server_exit_error;
 728                         }
 729                         vmin = parse_version(arg, strlen(arg));
 730                         if (vmin == 0) {
 731                                 fprintf(stderr,
 732                                         "ERROR: unrecognised version '%s'\n",
 733                                         arg);
 734                                 usage_server();
 735                                 goto server_exit_error;
 736                         }
 737                 } else if (eqstr(arg, "-vmax")) {
 738                         if (++ i >= argc) {
 739                                 fprintf(stderr,
 740                                         "ERROR: no argument for '-vmax'\n");
 741                                 usage_server();
 742                                 goto server_exit_error;
 743                         }
 744                         arg = argv[i];
 745                         if (vmax != 0) {
 746                                 fprintf(stderr,
 747                                         "ERROR: duplicate maximum version\n");
 748                                 usage_server();
 749                                 goto server_exit_error;
 750                         }
 751                         vmax = parse_version(arg, strlen(arg));
 752                         if (vmax == 0) {
 753                                 fprintf(stderr,
 754                                         "ERROR: unrecognised version '%s'\n",
 755                                         arg);
 756                                 usage_server();
 757                                 goto server_exit_error;
 758                         }
 759                 } else if (eqstr(arg, "-cs")) {
 760                         if (++ i >= argc) {
 761                                 fprintf(stderr,
 762                                         "ERROR: no argument for '-cs'\n");
 763                                 usage_server();
 764                                 goto server_exit_error;
 765                         }
 766                         arg = argv[i];
 767                         if (suites != NULL) {
 768                                 fprintf(stderr, "ERROR: duplicate list"
 769                                         " of cipher suites\n");
 770                                 usage_server();
 771                                 goto server_exit_error;
 772                         }
 773                         suites = parse_suites(arg, &num_suites);
 774                         if (suites == NULL) {
 775                                 usage_server();
 776                                 goto server_exit_error;
 777                         }
 778                 } else if (eqstr(arg, "-hf")) {
 779                         unsigned x;
 780
 781                         if (++ i >= argc) {
 782                                 fprintf(stderr,
 783                                         "ERROR: no argument for '-hf'\n");
 784                                 usage_server();
 785                                 goto server_exit_error;
 786                         }
 787                         arg = argv[i];
 788                         x = parse_hash_functions(arg);
 789                         if (x == 0) {
 790                                 usage_server();
 791                                 goto server_exit_error;
 792                         }
 793                         hfuns |= x;
 794                 } else if (eqstr(arg, "-serverpref")) {
 795                         flags |= BR_OPT_ENFORCE_SERVER_PREFERENCES;
 796                 } else if (eqstr(arg, "-noreneg")) {
 797                         flags |= BR_OPT_NO_RENEGOTIATION;
 798                 } else {
 799                         fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
 800                         usage_server();
 801                         goto server_exit_error;
 802                 }
 803         }
 804         if (port == NULL) {
 805                 port = "4433";
 806         }
 807         if (vmin == 0) {
 808                 vmin = BR_TLS10;
 809         }
 810         if (vmax == 0) {
 811                 vmax = BR_TLS12;
 812         }
 813         if (vmax < vmin) {
 814                 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
 815                         " version combination\n");
 816                 usage_server();
 817                 goto server_exit_error;
 818         }
 819         if (suites == NULL) {
 820                 num_suites = 0;
 821
 822                 for (u = 0; cipher_suites[u].name; u ++) {
 823                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 824                                 || vmax >= BR_TLS12)
 825                         {
 826                                 num_suites ++;
 827                         }
 828                 }
 829                 suites = xmalloc(num_suites * sizeof *suites);
 830                 num_suites = 0;
 831                 for (u = 0; cipher_suites[u].name; u ++) {
 832                         if ((cipher_suites[u].req & REQ_TLS12) == 0
 833                                 || vmax >= BR_TLS12)
 834                         {
 835                                 suites[num_suites ++] = cipher_suites[u];
 836                         }
 837                 }
 838         }
 839         if (hfuns == 0) {
 840                 hfuns = (unsigned)-1;
 841         }
 842         if (chain == NULL || chain_len == 0) {
 843                 fprintf(stderr, "ERROR: no certificate chain provided\n");
 844                 goto server_exit_error;
 845         }
 846         if (sk == NULL) {
 847                 fprintf(stderr, "ERROR: no private key provided\n");
 848                 goto server_exit_error;
 849         }
 850         switch (sk->key_type) {
 851                 int curve;
 852                 uint32_t supp;
 853
 854         case BR_KEYTYPE_RSA:
 855                 break;
 856         case BR_KEYTYPE_EC:
 857                 curve = sk->key.ec.curve;
 858                 supp = br_ec_prime_i31.supported_curves;
 859                 if (curve > 31 || !((supp >> curve) & 1)) {
 860                         fprintf(stderr, "ERROR: private key curve (%d)"
 861                                 " is not supported\n", curve);
 862                         goto server_exit_error;
 863                 }
 864                 break;
 865         default:
 866                 fprintf(stderr, "ERROR: unsupported private key type (%d)\n",
 867                         sk->key_type);
 868                 break;
 869         }
 870         cert_signer_algo = get_cert_signer_algo(chain);
 871         if (cert_signer_algo < 0) {
 872                 fprintf(stderr, "ERROR: server certificate cannot be"
 873                         " decoded (err=%d)\n", -cert_signer_algo);
 874                 goto server_exit_error;
 875         } else if (verbose) {
 876                 const char *csas;
 877
 878                 switch (cert_signer_algo) {
 879                 case BR_KEYTYPE_RSA: csas = "RSA"; break;
 880                 case BR_KEYTYPE_EC:  csas = "EC"; break;
 881                 default:
 882                         csas = "unknown";
 883                         break;
 884                 }
 885                 fprintf(stderr, "Issuing CA key type: %d (%s)\n",
 886                         cert_signer_algo, csas);
 887         }
 888         if (iobuf_len == 0) {
 889                 if (bidi) {
 890                         iobuf_len = BR_SSL_BUFSIZE_BIDI;
 891                 } else {
 892                         iobuf_len = BR_SSL_BUFSIZE_MONO;
 893                 }
 894         }
 895         iobuf = xmalloc(iobuf_len);
 896         if (cache_len == (size_t)-1) {
 897                 cache_len = 5000;
 898         }
 899         cache = xmalloc(cache_len);
 900
 901         /*
 902          * Compute implementation requirements and inject implementations.
 903          */
 904         suite_ids = xmalloc(num_suites * sizeof *suite_ids);
 905         br_ssl_server_zero(&cc);
 906         br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
 907         br_ssl_engine_set_all_flags(&cc.eng, flags);
 908         if (vmin <= BR_TLS11) {
 909                 if (!(hfuns & (1 << br_md5_ID))) {
 910                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
 911                         goto server_exit_error;
 912                 }
 913                 if (!(hfuns & (1 << br_sha1_ID))) {
 914                         fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
 915                         goto server_exit_error;
 916                 }
 917         }
 918         for (u = 0; u < num_suites; u ++) {
 919                 unsigned req;
 920
 921                 req = suites[u].req;
 922                 suite_ids[u] = suites[u].suite;
 923                 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
 924                         fprintf(stderr,
 925                                 "ERROR: cipher suite %s requires TLS 1.2\n",
 926                                 suites[u].name);
 927                         goto server_exit_error;
 928                 }
 929                 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
 930                         fprintf(stderr,
 931                                 "ERROR: cipher suite %s requires SHA-1\n",
 932                                 suites[u].name);
 933                         goto server_exit_error;
 934                 }
 935                 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
 936                         fprintf(stderr,
 937                                 "ERROR: cipher suite %s requires SHA-256\n",
 938                                 suites[u].name);
 939                         goto server_exit_error;
 940                 }
 941                 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
 942                         fprintf(stderr,
 943                                 "ERROR: cipher suite %s requires SHA-384\n",
 944                                 suites[u].name);
 945                         goto server_exit_error;
 946                 }
 947                 /* TODO: algorithm implementation selection */
 948                 if ((req & REQ_AESCBC) != 0) {
 949                         br_ssl_engine_set_aes_cbc(&cc.eng,
 950                                 &br_aes_ct_cbcenc_vtable,
 951                                 &br_aes_ct_cbcdec_vtable);
 952                         br_ssl_engine_set_cbc(&cc.eng,
 953                                 &br_sslrec_in_cbc_vtable,
 954                                 &br_sslrec_out_cbc_vtable);
 955                 }
 956                 if ((req & REQ_AESGCM) != 0) {
 957                         br_ssl_engine_set_aes_ctr(&cc.eng,
 958                                 &br_aes_ct_ctr_vtable);
 959                         br_ssl_engine_set_ghash(&cc.eng,
 960                                 &br_ghash_ctmul);
 961                         br_ssl_engine_set_gcm(&cc.eng,
 962                                 &br_sslrec_in_gcm_vtable,
 963                                 &br_sslrec_out_gcm_vtable);
 964                 }
 965                 if ((req & REQ_3DESCBC) != 0) {
 966                         br_ssl_engine_set_des_cbc(&cc.eng,
 967                                 &br_des_ct_cbcenc_vtable,
 968                                 &br_des_ct_cbcdec_vtable);
 969                         br_ssl_engine_set_cbc(&cc.eng,
 970                                 &br_sslrec_in_cbc_vtable,
 971                                 &br_sslrec_out_cbc_vtable);
 972                 }
 973                 if ((req & (REQ_ECDHE_RSA | REQ_ECDHE_ECDSA)) != 0) {
 974                         br_ssl_engine_set_ec(&cc.eng, &br_ec_prime_i31);
 975                 }
 976         }
 977         br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
 978
 979         for (u = 0; hash_functions[u].name; u ++) {
 980                 const br_hash_class *hc;
 981                 int id;
 982
 983                 hc = hash_functions[u].hclass;
 984                 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
 985                 if ((hfuns & ((unsigned)1 << id)) != 0) {
 986                         br_ssl_engine_set_hash(&cc.eng, id, hc);
 987                 }
 988         }
 989         if (vmin <= BR_TLS11) {
 990                 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
 991         }
 992         if (vmax >= BR_TLS12) {
 993                 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
 994                         br_ssl_engine_set_prf_sha256(&cc.eng,
 995                                 &br_tls12_sha256_prf);
 996                 }
 997                 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
 998                         br_ssl_engine_set_prf_sha384(&cc.eng,
 999                                 &br_tls12_sha384_prf);
1000                 }
1001         }
1002
1003         br_ssl_session_cache_lru_init(&lru, cache, cache_len);
1004         br_ssl_server_set_cache(&cc, &lru.vtable);
1005
1006         pc.vtable = &policy_vtable;
1007         pc.verbose = verbose;
1008         pc.chain = chain;
1009         pc.chain_len = chain_len;
1010         pc.cert_signer_algo = cert_signer_algo;
1011         pc.sk = sk;
1012         br_ssl_server_set_policy(&cc, &pc.vtable);
1013
1014         br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
1015
1016         /*
1017          * We need to ignore SIGPIPE.
1018          */
1019         signal(SIGPIPE, SIG_IGN);
1020
1021         /*
1022          * Open the server socket.
1023          */
1024         server_fd = host_bind(bind_name, port, verbose);
1025         if (server_fd < 0) {
1026                 goto server_exit_error;
1027         }
1028
1029         /*
1030          * Process incoming clients, one at a time. Note that we do not
1031          * accept any client until the previous connection has finished:
1032          * this is voluntary, since the tool uses stdin/stdout for
1033          * application data, and thus cannot really run two connections
1034          * simultaneously.
1035          */
1036         for (;;) {
1037                 int x;
1038
1039                 fd = accept_client(server_fd, verbose);
1040                 if (fd < 0) {
1041                         goto server_exit_error;
1042                 }
1043                 br_ssl_server_reset(&cc);
1044                 x = run_ssl_engine(&cc.eng, fd,
1045                         (verbose ? RUN_ENGINE_VERBOSE : 0)
1046                         | (trace ? RUN_ENGINE_TRACE : 0));
1047                 close(fd);
1048                 fd = -1;
1049                 if (x < -1) {
1050                         goto server_exit_error;
1051                 }
1052         }
1053
1054         /*
1055          * Release allocated structures.
1056          */
1057 server_exit:
1058         xfree(suites);
1059         xfree(suite_ids);
1060         if (chain != NULL) {
1061                 for (u = 0; u < chain_len; u ++) {
1062                         xfree(chain[u].data);
1063                 }
1064                 xfree(chain);
1065         }
1066         free_private_key(sk);
1067         xfree(iobuf);
1068         xfree(cache);
1069         if (fd >= 0) {
1070                 close(fd);
1071         }
1072         return retcode;
1073
1074 server_exit_error:
1075         retcode = -1;
1076         goto server_exit;
1077 }