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 #ifdef _WIN32
33 #include <winsock2.h>
34 #include <ws2tcpip.h>
35 #else
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <netdb.h>
39 #include <netinet/in.h>
40 #include <arpa/inet.h>
41 #include <unistd.h>
42 #include <fcntl.h>
43
44 #define SOCKET int
45 #define INVALID_SOCKET (-1)
46 #define SOCKADDR_STORAGE struct sockaddr_storage
47 #endif
48
49 #include "brssl.h"
50
51 static SOCKET
host_bind(const char * host,const char * port,int verbose)52 host_bind(const char *host, const char *port, int verbose)
53 {
54 struct addrinfo hints, *si, *p;
55 SOCKET fd;
56 int err;
57
58 memset(&hints, 0, sizeof hints);
59 hints.ai_family = PF_UNSPEC;
60 hints.ai_socktype = SOCK_STREAM;
61 err = getaddrinfo(host, port, &hints, &si);
62 if (err != 0) {
63 fprintf(stderr, "ERROR: getaddrinfo(): %s\n",
64 gai_strerror(err));
65 return INVALID_SOCKET;
66 }
67 fd = INVALID_SOCKET;
68 for (p = si; p != NULL; p = p->ai_next) {
69 struct sockaddr *sa;
70 struct sockaddr_in sa4;
71 struct sockaddr_in6 sa6;
72 size_t sa_len;
73 void *addr;
74 int opt;
75
76 sa = (struct sockaddr *)p->ai_addr;
77 if (sa->sa_family == AF_INET) {
78 memcpy(&sa4, sa, sizeof sa4);
79 sa = (struct sockaddr *)&sa4;
80 sa_len = sizeof sa4;
81 addr = &sa4.sin_addr;
82 if (host == NULL) {
83 sa4.sin_addr.s_addr = INADDR_ANY;
84 }
85 } else if (sa->sa_family == AF_INET6) {
86 memcpy(&sa6, sa, sizeof sa6);
87 sa = (struct sockaddr *)&sa6;
88 sa_len = sizeof sa6;
89 addr = &sa6.sin6_addr;
90 if (host == NULL) {
91 sa6.sin6_addr = in6addr_any;
92 }
93 } else {
94 addr = NULL;
95 sa_len = p->ai_addrlen;
96 }
97 if (verbose) {
98 char tmp[INET6_ADDRSTRLEN + 50];
99
100 if (addr != NULL) {
101 if (!inet_ntop(p->ai_family, addr,
102 tmp, sizeof tmp))
103 {
104 strcpy(tmp, "<invalid>");
105 }
106 } else {
107 sprintf(tmp, "<unknown family: %d>",
108 (int)sa->sa_family);
109 }
110 fprintf(stderr, "binding to: %s\n", tmp);
111 }
112 fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
113 if (fd == INVALID_SOCKET) {
114 if (verbose) {
115 perror("socket()");
116 }
117 continue;
118 }
119 opt = 1;
120 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
121 (void *)&opt, sizeof opt);
122 #ifdef IPV6_V6ONLY
123 /*
124 * We want to make sure that the server socket works for
125 * both IPv4 and IPv6. But IPV6_V6ONLY is not defined on
126 * some very old systems.
127 */
128 opt = 0;
129 setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
130 (void *)&opt, sizeof opt);
131 #endif
132 if (bind(fd, sa, sa_len) < 0) {
133 if (verbose) {
134 perror("bind()");
135 }
136 #ifdef _WIN32
137 closesocket(fd);
138 #else
139 close(fd);
140 #endif
141 continue;
142 }
143 break;
144 }
145 if (p == NULL) {
146 freeaddrinfo(si);
147 fprintf(stderr, "ERROR: failed to bind\n");
148 return INVALID_SOCKET;
149 }
150 freeaddrinfo(si);
151 if (listen(fd, 5) < 0) {
152 if (verbose) {
153 perror("listen()");
154 }
155 #ifdef _WIN32
156 closesocket(fd);
157 #else
158 close(fd);
159 #endif
160 return INVALID_SOCKET;
161 }
162 if (verbose) {
163 fprintf(stderr, "bound.\n");
164 }
165 return fd;
166 }
167
168 static SOCKET
accept_client(SOCKET server_fd,int verbose,int nonblock)169 accept_client(SOCKET server_fd, int verbose, int nonblock)
170 {
171 int fd;
172 SOCKADDR_STORAGE sa;
173 socklen_t sa_len;
174
175 sa_len = sizeof sa;
176 fd = accept(server_fd, (struct sockaddr *)&sa, &sa_len);
177 if (fd == INVALID_SOCKET) {
178 if (verbose) {
179 perror("accept()");
180 }
181 return INVALID_SOCKET;
182 }
183 if (verbose) {
184 char tmp[INET6_ADDRSTRLEN + 50];
185 const char *name;
186
187 name = NULL;
188 switch (((struct sockaddr *)&sa)->sa_family) {
189 case AF_INET:
190 name = inet_ntop(AF_INET,
191 &((struct sockaddr_in *)&sa)->sin_addr,
192 tmp, sizeof tmp);
193 break;
194 case AF_INET6:
195 name = inet_ntop(AF_INET6,
196 &((struct sockaddr_in6 *)&sa)->sin6_addr,
197 tmp, sizeof tmp);
198 break;
199 }
200 if (name == NULL) {
201 sprintf(tmp, "<unknown: %lu>", (unsigned long)
202 ((struct sockaddr *)&sa)->sa_family);
203 name = tmp;
204 }
205 fprintf(stderr, "accepting connection from: %s\n", name);
206 }
207
208 /*
209 * We make the socket non-blocking, since we are going to use
210 * poll() or select() to organise I/O.
211 */
212 if (nonblock) {
213 #ifdef _WIN32
214 u_long arg;
215
216 arg = 1;
217 ioctlsocket(fd, FIONBIO, &arg);
218 #else
219 fcntl(fd, F_SETFL, O_NONBLOCK);
220 #endif
221 }
222 return fd;
223 }
224
225 static void
usage_server(void)226 usage_server(void)
227 {
228 fprintf(stderr,
229 "usage: brssl server [ options ]\n");
230 fprintf(stderr,
231 "options:\n");
232 fprintf(stderr,
233 " -q suppress verbose messages\n");
234 fprintf(stderr,
235 " -trace activate extra debug messages (dump of all packets)\n");
236 fprintf(stderr,
237 " -b name bind to a specific address or host name\n");
238 fprintf(stderr,
239 " -p port bind to a specific port (default: 4433)\n");
240 fprintf(stderr,
241 " -mono use monodirectional buffering\n");
242 fprintf(stderr,
243 " -buf length set the I/O buffer length (in bytes)\n");
244 fprintf(stderr,
245 " -cache length set the session cache storage length (in bytes)\n");
246 fprintf(stderr,
247 " -cert fname read certificate chain from file 'fname'\n");
248 fprintf(stderr,
249 " -key fname read private key from file 'fname'\n");
250 fprintf(stderr,
251 " -CA file add trust anchors from 'file' (for client auth)\n");
252 fprintf(stderr,
253 " -anon_ok request but do not require a client certificate\n");
254 fprintf(stderr,
255 " -list list supported names (protocols, algorithms...)\n");
256 fprintf(stderr,
257 " -vmin name set minimum supported version (default: TLS-1.0)\n");
258 fprintf(stderr,
259 " -vmax name set maximum supported version (default: TLS-1.2)\n");
260 fprintf(stderr,
261 " -cs names set list of supported cipher suites (comma-separated)\n");
262 fprintf(stderr,
263 " -hf names add support for some hash functions (comma-separated)\n");
264 fprintf(stderr,
265 " -cbhash test hashing in policy callback\n");
266 fprintf(stderr,
267 " -serverpref enforce server's preferences for cipher suites\n");
268 fprintf(stderr,
269 " -noreneg prohibit renegotiations\n");
270 fprintf(stderr,
271 " -alpn name add protocol name to list of protocols (ALPN extension)\n");
272 fprintf(stderr,
273 " -strictalpn fail on ALPN mismatch\n");
274 exit(EXIT_FAILURE);
275 }
276
277 typedef struct {
278 const br_ssl_server_policy_class *vtable;
279 int verbose;
280 br_x509_certificate *chain;
281 size_t chain_len;
282 int cert_signer_algo;
283 private_key *sk;
284 int cbhash;
285 } policy_context;
286
287 static void
print_hashes(unsigned chashes)288 print_hashes(unsigned chashes)
289 {
290 int i;
291
292 for (i = 2; i <= 6; i ++) {
293 if ((chashes >> i) & 1) {
294 int z;
295
296 switch (i) {
297 case 3: z = 224; break;
298 case 4: z = 256; break;
299 case 5: z = 384; break;
300 case 6: z = 512; break;
301 default:
302 z = 1;
303 break;
304 }
305 fprintf(stderr, " sha%d", z);
306 }
307 }
308 }
309
310 static unsigned
choose_hash(unsigned chashes)311 choose_hash(unsigned chashes)
312 {
313 unsigned hash_id;
314
315 for (hash_id = 6; hash_id >= 2; hash_id --) {
316 if (((chashes >> hash_id) & 1) != 0) {
317 return hash_id;
318 }
319 }
320 /*
321 * Normally unreachable.
322 */
323 return 0;
324 }
325
326 static int
sp_choose(const br_ssl_server_policy_class ** pctx,const br_ssl_server_context * cc,br_ssl_server_choices * choices)327 sp_choose(const br_ssl_server_policy_class **pctx,
328 const br_ssl_server_context *cc,
329 br_ssl_server_choices *choices)
330 {
331 policy_context *pc;
332 const br_suite_translated *st;
333 size_t u, st_num;
334 unsigned chashes;
335
336 pc = (policy_context *)pctx;
337 st = br_ssl_server_get_client_suites(cc, &st_num);
338 chashes = br_ssl_server_get_client_hashes(cc);
339 if (pc->verbose) {
340 fprintf(stderr, "Client parameters:\n");
341 fprintf(stderr, " Maximum version: ");
342 switch (cc->client_max_version) {
343 case BR_SSL30:
344 fprintf(stderr, "SSL 3.0");
345 break;
346 case BR_TLS10:
347 fprintf(stderr, "TLS 1.0");
348 break;
349 case BR_TLS11:
350 fprintf(stderr, "TLS 1.1");
351 break;
352 case BR_TLS12:
353 fprintf(stderr, "TLS 1.2");
354 break;
355 default:
356 fprintf(stderr, "unknown (0x%04X)",
357 (unsigned)cc->client_max_version);
358 break;
359 }
360 fprintf(stderr, "\n");
361 fprintf(stderr, " Compatible cipher suites:\n");
362 for (u = 0; u < st_num; u ++) {
363 char csn[80];
364
365 get_suite_name_ext(st[u][0], csn, sizeof csn);
366 fprintf(stderr, " %s\n", csn);
367 }
368 fprintf(stderr, " Common sign+hash functions:\n");
369 if ((chashes & 0xFF) != 0) {
370 fprintf(stderr, " with RSA:");
371 print_hashes(chashes);
372 fprintf(stderr, "\n");
373 }
374 if ((chashes >> 8) != 0) {
375 fprintf(stderr, " with ECDSA:");
376 print_hashes(chashes >> 8);
377 fprintf(stderr, "\n");
378 }
379 }
380 for (u = 0; u < st_num; u ++) {
381 unsigned tt;
382
383 tt = st[u][1];
384 switch (tt >> 12) {
385 case BR_SSLKEYX_RSA:
386 if (pc->sk->key_type == BR_KEYTYPE_RSA) {
387 choices->cipher_suite = st[u][0];
388 goto choose_ok;
389 }
390 break;
391 case BR_SSLKEYX_ECDHE_RSA:
392 if (pc->sk->key_type == BR_KEYTYPE_RSA) {
393 choices->cipher_suite = st[u][0];
394 if (br_ssl_engine_get_version(&cc->eng)
395 < BR_TLS12)
396 {
397 if (pc->cbhash) {
398 choices->algo_id = 0x0001;
399 } else {
400 choices->algo_id = 0xFF00;
401 }
402 } else {
403 unsigned id;
404
405 id = choose_hash(chashes);
406 if (pc->cbhash) {
407 choices->algo_id =
408 (id << 8) + 0x01;
409 } else {
410 choices->algo_id = 0xFF00 + id;
411 }
412 }
413 goto choose_ok;
414 }
415 break;
416 case BR_SSLKEYX_ECDHE_ECDSA:
417 if (pc->sk->key_type == BR_KEYTYPE_EC) {
418 choices->cipher_suite = st[u][0];
419 if (br_ssl_engine_get_version(&cc->eng)
420 < BR_TLS12)
421 {
422 if (pc->cbhash) {
423 choices->algo_id = 0x0203;
424 } else {
425 choices->algo_id =
426 0xFF00 + br_sha1_ID;
427 }
428 } else {
429 unsigned id;
430
431 id = choose_hash(chashes >> 8);
432 if (pc->cbhash) {
433 choices->algo_id =
434 (id << 8) + 0x03;
435 } else {
436 choices->algo_id =
437 0xFF00 + id;
438 }
439 }
440 goto choose_ok;
441 }
442 break;
443 case BR_SSLKEYX_ECDH_RSA:
444 if (pc->sk->key_type == BR_KEYTYPE_EC
445 && pc->cert_signer_algo == BR_KEYTYPE_RSA)
446 {
447 choices->cipher_suite = st[u][0];
448 goto choose_ok;
449 }
450 break;
451 case BR_SSLKEYX_ECDH_ECDSA:
452 if (pc->sk->key_type == BR_KEYTYPE_EC
453 && pc->cert_signer_algo == BR_KEYTYPE_EC)
454 {
455 choices->cipher_suite = st[u][0];
456 goto choose_ok;
457 }
458 break;
459 }
460 }
461 return 0;
462
463 choose_ok:
464 choices->chain = pc->chain;
465 choices->chain_len = pc->chain_len;
466 if (pc->verbose) {
467 char csn[80];
468
469 get_suite_name_ext(choices->cipher_suite, csn, sizeof csn);
470 fprintf(stderr, "Using: %s\n", csn);
471 }
472 return 1;
473 }
474
475 static uint32_t
sp_do_keyx(const br_ssl_server_policy_class ** pctx,unsigned char * data,size_t * len)476 sp_do_keyx(const br_ssl_server_policy_class **pctx,
477 unsigned char *data, size_t *len)
478 {
479 policy_context *pc;
480 uint32_t r;
481 size_t xoff, xlen;
482
483 pc = (policy_context *)pctx;
484 switch (pc->sk->key_type) {
485 const br_ec_impl *iec;
486
487 case BR_KEYTYPE_RSA:
488 return br_rsa_ssl_decrypt(
489 br_rsa_private_get_default(),
490 &pc->sk->key.rsa, data, *len);
491 case BR_KEYTYPE_EC:
492 iec = br_ec_get_default();
493 r = iec->mul(data, *len, pc->sk->key.ec.x,
494 pc->sk->key.ec.xlen, pc->sk->key.ec.curve);
495 xoff = iec->xoff(pc->sk->key.ec.curve, &xlen);
496 memmove(data, data + xoff, xlen);
497 *len = xlen;
498 return r;
499 default:
500 fprintf(stderr, "ERROR: unknown private key type (%d)\n",
501 (int)pc->sk->key_type);
502 return 0;
503 }
504 }
505
506 static size_t
sp_do_sign(const br_ssl_server_policy_class ** pctx,unsigned algo_id,unsigned char * data,size_t hv_len,size_t len)507 sp_do_sign(const br_ssl_server_policy_class **pctx,
508 unsigned algo_id, unsigned char *data, size_t hv_len, size_t len)
509 {
510 policy_context *pc;
511 unsigned char hv[64];
512
513 pc = (policy_context *)pctx;
514 if (algo_id >= 0xFF00) {
515 algo_id &= 0xFF;
516 memcpy(hv, data, hv_len);
517 } else {
518 const br_hash_class *hc;
519 br_hash_compat_context zc;
520
521 if (pc->verbose) {
522 fprintf(stderr, "Callback hashing, algo = 0x%04X,"
523 " data_len = %lu\n",
524 algo_id, (unsigned long)hv_len);
525 }
526 algo_id >>= 8;
527 hc = get_hash_impl(algo_id);
528 if (hc == NULL) {
529 if (pc->verbose) {
530 fprintf(stderr,
531 "ERROR: unsupported hash function %u\n",
532 algo_id);
533 }
534 return 0;
535 }
536 hc->init(&zc.vtable);
537 hc->update(&zc.vtable, data, hv_len);
538 hc->out(&zc.vtable, hv);
539 hv_len = (hc->desc >> BR_HASHDESC_OUT_OFF)
540 & BR_HASHDESC_OUT_MASK;
541 }
542 switch (pc->sk->key_type) {
543 size_t sig_len;
544 uint32_t x;
545 const unsigned char *hash_oid;
546 const br_hash_class *hc;
547
548 case BR_KEYTYPE_RSA:
549 hash_oid = get_hash_oid(algo_id);
550 if (hash_oid == NULL && algo_id != 0) {
551 if (pc->verbose) {
552 fprintf(stderr, "ERROR: cannot RSA-sign with"
553 " unknown hash function: %u\n",
554 algo_id);
555 }
556 return 0;
557 }
558 sig_len = (pc->sk->key.rsa.n_bitlen + 7) >> 3;
559 if (len < sig_len) {
560 if (pc->verbose) {
561 fprintf(stderr, "ERROR: cannot RSA-sign,"
562 " buffer is too small"
563 " (sig=%lu, buf=%lu)\n",
564 (unsigned long)sig_len,
565 (unsigned long)len);
566 }
567 return 0;
568 }
569 x = br_rsa_pkcs1_sign_get_default()(
570 hash_oid, hv, hv_len, &pc->sk->key.rsa, data);
571 if (!x) {
572 if (pc->verbose) {
573 fprintf(stderr, "ERROR: RSA-sign failure\n");
574 }
575 return 0;
576 }
577 return sig_len;
578
579 case BR_KEYTYPE_EC:
580 hc = get_hash_impl(algo_id);
581 if (hc == NULL) {
582 if (pc->verbose) {
583 fprintf(stderr, "ERROR: cannot ECDSA-sign with"
584 " unknown hash function: %u\n",
585 algo_id);
586 }
587 return 0;
588 }
589 if (len < 139) {
590 if (pc->verbose) {
591 fprintf(stderr, "ERROR: cannot ECDSA-sign"
592 " (output buffer = %lu)\n",
593 (unsigned long)len);
594 }
595 return 0;
596 }
597 sig_len = br_ecdsa_sign_asn1_get_default()(
598 br_ec_get_default(), hc, hv, &pc->sk->key.ec, data);
599 if (sig_len == 0) {
600 if (pc->verbose) {
601 fprintf(stderr, "ERROR: ECDSA-sign failure\n");
602 }
603 return 0;
604 }
605 return sig_len;
606
607 default:
608 return 0;
609 }
610 }
611
612 static const br_ssl_server_policy_class policy_vtable = {
613 sizeof(policy_context),
614 sp_choose,
615 sp_do_keyx,
616 sp_do_sign
617 };
618
619 void
free_alpn(void * alpn)620 free_alpn(void *alpn)
621 {
622 xfree(*(char **)alpn);
623 }
624
625 /* see brssl.h */
626 int
do_server(int argc,char * argv[])627 do_server(int argc, char *argv[])
628 {
629 int retcode;
630 int verbose;
631 int trace;
632 int i, bidi;
633 const char *bind_name;
634 const char *port;
635 unsigned vmin, vmax;
636 cipher_suite *suites;
637 size_t num_suites;
638 uint16_t *suite_ids;
639 unsigned hfuns;
640 int cbhash;
641 br_x509_certificate *chain;
642 size_t chain_len;
643 int cert_signer_algo;
644 private_key *sk;
645 anchor_list anchors = VEC_INIT;
646 VECTOR(char *) alpn_names = VEC_INIT;
647 br_x509_minimal_context xc;
648 const br_hash_class *dnhash;
649 size_t u;
650 br_ssl_server_context cc;
651 policy_context pc;
652 br_ssl_session_cache_lru lru;
653 unsigned char *iobuf, *cache;
654 size_t iobuf_len, cache_len;
655 uint32_t flags;
656 SOCKET server_fd, fd;
657
658 retcode = 0;
659 verbose = 1;
660 trace = 0;
661 bind_name = NULL;
662 port = NULL;
663 bidi = 1;
664 vmin = 0;
665 vmax = 0;
666 suites = NULL;
667 num_suites = 0;
668 hfuns = 0;
669 cbhash = 0;
670 suite_ids = NULL;
671 chain = NULL;
672 chain_len = 0;
673 sk = NULL;
674 iobuf = NULL;
675 iobuf_len = 0;
676 cache = NULL;
677 cache_len = (size_t)-1;
678 flags = 0;
679 server_fd = INVALID_SOCKET;
680 fd = INVALID_SOCKET;
681 for (i = 0; i < argc; i ++) {
682 const char *arg;
683
684 arg = argv[i];
685 if (arg[0] != '-') {
686 usage_server();
687 goto server_exit_error;
688 }
689 if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
690 verbose = 1;
691 } else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
692 verbose = 0;
693 } else if (eqstr(arg, "-trace")) {
694 trace = 1;
695 } else if (eqstr(arg, "-b")) {
696 if (++ i >= argc) {
697 fprintf(stderr,
698 "ERROR: no argument for '-b'\n");
699 usage_server();
700 goto server_exit_error;
701 }
702 if (bind_name != NULL) {
703 fprintf(stderr, "ERROR: duplicate bind host\n");
704 usage_server();
705 goto server_exit_error;
706 }
707 bind_name = argv[i];
708 } else if (eqstr(arg, "-p")) {
709 if (++ i >= argc) {
710 fprintf(stderr,
711 "ERROR: no argument for '-p'\n");
712 usage_server();
713 goto server_exit_error;
714 }
715 if (port != NULL) {
716 fprintf(stderr, "ERROR: duplicate bind port\n");
717 usage_server();
718 goto server_exit_error;
719 }
720 port = argv[i];
721 } else if (eqstr(arg, "-mono")) {
722 bidi = 0;
723 } else if (eqstr(arg, "-buf")) {
724 if (++ i >= argc) {
725 fprintf(stderr,
726 "ERROR: no argument for '-buf'\n");
727 usage_server();
728 goto server_exit_error;
729 }
730 arg = argv[i];
731 if (iobuf_len != 0) {
732 fprintf(stderr,
733 "ERROR: duplicate I/O buffer length\n");
734 usage_server();
735 goto server_exit_error;
736 }
737 iobuf_len = parse_size(arg);
738 if (iobuf_len == (size_t)-1) {
739 usage_server();
740 goto server_exit_error;
741 }
742 } else if (eqstr(arg, "-cache")) {
743 if (++ i >= argc) {
744 fprintf(stderr,
745 "ERROR: no argument for '-cache'\n");
746 usage_server();
747 goto server_exit_error;
748 }
749 arg = argv[i];
750 if (cache_len != (size_t)-1) {
751 fprintf(stderr, "ERROR: duplicate session"
752 " cache length\n");
753 usage_server();
754 goto server_exit_error;
755 }
756 cache_len = parse_size(arg);
757 if (cache_len == (size_t)-1) {
758 usage_server();
759 goto server_exit_error;
760 }
761 } else if (eqstr(arg, "-cert")) {
762 if (++ i >= argc) {
763 fprintf(stderr,
764 "ERROR: no argument for '-cert'\n");
765 usage_server();
766 goto server_exit_error;
767 }
768 if (chain != NULL) {
769 fprintf(stderr,
770 "ERROR: duplicate certificate chain\n");
771 usage_server();
772 goto server_exit_error;
773 }
774 arg = argv[i];
775 chain = read_certificates(arg, &chain_len);
776 if (chain == NULL || chain_len == 0) {
777 goto server_exit_error;
778 }
779 } else if (eqstr(arg, "-key")) {
780 if (++ i >= argc) {
781 fprintf(stderr,
782 "ERROR: no argument for '-key'\n");
783 usage_server();
784 goto server_exit_error;
785 }
786 if (sk != NULL) {
787 fprintf(stderr,
788 "ERROR: duplicate private key\n");
789 usage_server();
790 goto server_exit_error;
791 }
792 arg = argv[i];
793 sk = read_private_key(arg);
794 if (sk == NULL) {
795 goto server_exit_error;
796 }
797 } else if (eqstr(arg, "-CA")) {
798 if (++ i >= argc) {
799 fprintf(stderr,
800 "ERROR: no argument for '-CA'\n");
801 usage_server();
802 goto server_exit_error;
803 }
804 arg = argv[i];
805 if (read_trust_anchors(&anchors, arg) == 0) {
806 usage_server();
807 goto server_exit_error;
808 }
809 } else if (eqstr(arg, "-anon_ok")) {
810 flags |= BR_OPT_TOLERATE_NO_CLIENT_AUTH;
811 } else if (eqstr(arg, "-list")) {
812 list_names();
813 goto server_exit;
814 } else if (eqstr(arg, "-vmin")) {
815 if (++ i >= argc) {
816 fprintf(stderr,
817 "ERROR: no argument for '-vmin'\n");
818 usage_server();
819 goto server_exit_error;
820 }
821 arg = argv[i];
822 if (vmin != 0) {
823 fprintf(stderr,
824 "ERROR: duplicate minimum version\n");
825 usage_server();
826 goto server_exit_error;
827 }
828 vmin = parse_version(arg, strlen(arg));
829 if (vmin == 0) {
830 fprintf(stderr,
831 "ERROR: unrecognised version '%s'\n",
832 arg);
833 usage_server();
834 goto server_exit_error;
835 }
836 } else if (eqstr(arg, "-vmax")) {
837 if (++ i >= argc) {
838 fprintf(stderr,
839 "ERROR: no argument for '-vmax'\n");
840 usage_server();
841 goto server_exit_error;
842 }
843 arg = argv[i];
844 if (vmax != 0) {
845 fprintf(stderr,
846 "ERROR: duplicate maximum version\n");
847 usage_server();
848 goto server_exit_error;
849 }
850 vmax = parse_version(arg, strlen(arg));
851 if (vmax == 0) {
852 fprintf(stderr,
853 "ERROR: unrecognised version '%s'\n",
854 arg);
855 usage_server();
856 goto server_exit_error;
857 }
858 } else if (eqstr(arg, "-cs")) {
859 if (++ i >= argc) {
860 fprintf(stderr,
861 "ERROR: no argument for '-cs'\n");
862 usage_server();
863 goto server_exit_error;
864 }
865 arg = argv[i];
866 if (suites != NULL) {
867 fprintf(stderr, "ERROR: duplicate list"
868 " of cipher suites\n");
869 usage_server();
870 goto server_exit_error;
871 }
872 suites = parse_suites(arg, &num_suites);
873 if (suites == NULL) {
874 usage_server();
875 goto server_exit_error;
876 }
877 } else if (eqstr(arg, "-hf")) {
878 unsigned x;
879
880 if (++ i >= argc) {
881 fprintf(stderr,
882 "ERROR: no argument for '-hf'\n");
883 usage_server();
884 goto server_exit_error;
885 }
886 arg = argv[i];
887 x = parse_hash_functions(arg);
888 if (x == 0) {
889 usage_server();
890 goto server_exit_error;
891 }
892 hfuns |= x;
893 } else if (eqstr(arg, "-cbhash")) {
894 cbhash = 1;
895 } else if (eqstr(arg, "-serverpref")) {
896 flags |= BR_OPT_ENFORCE_SERVER_PREFERENCES;
897 } else if (eqstr(arg, "-noreneg")) {
898 flags |= BR_OPT_NO_RENEGOTIATION;
899 } else if (eqstr(arg, "-alpn")) {
900 if (++ i >= argc) {
901 fprintf(stderr,
902 "ERROR: no argument for '-alpn'\n");
903 usage_server();
904 goto server_exit_error;
905 }
906 VEC_ADD(alpn_names, xstrdup(argv[i]));
907 } else if (eqstr(arg, "-strictalpn")) {
908 flags |= BR_OPT_FAIL_ON_ALPN_MISMATCH;
909 } else {
910 fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
911 usage_server();
912 goto server_exit_error;
913 }
914 }
915 if (port == NULL) {
916 port = "4433";
917 }
918 if (vmin == 0) {
919 vmin = BR_TLS10;
920 }
921 if (vmax == 0) {
922 vmax = BR_TLS12;
923 }
924 if (vmax < vmin) {
925 fprintf(stderr, "ERROR: impossible minimum/maximum protocol"
926 " version combination\n");
927 usage_server();
928 goto server_exit_error;
929 }
930 if (suites == NULL) {
931 num_suites = 0;
932
933 for (u = 0; cipher_suites[u].name; u ++) {
934 if ((cipher_suites[u].req & REQ_TLS12) == 0
935 || vmax >= BR_TLS12)
936 {
937 num_suites ++;
938 }
939 }
940 suites = xmalloc(num_suites * sizeof *suites);
941 num_suites = 0;
942 for (u = 0; cipher_suites[u].name; u ++) {
943 if ((cipher_suites[u].req & REQ_TLS12) == 0
944 || vmax >= BR_TLS12)
945 {
946 suites[num_suites ++] = cipher_suites[u];
947 }
948 }
949 }
950 if (hfuns == 0) {
951 hfuns = (unsigned)-1;
952 }
953 if (chain == NULL || chain_len == 0) {
954 fprintf(stderr, "ERROR: no certificate chain provided\n");
955 goto server_exit_error;
956 }
957 if (sk == NULL) {
958 fprintf(stderr, "ERROR: no private key provided\n");
959 goto server_exit_error;
960 }
961 switch (sk->key_type) {
962 int curve;
963 uint32_t supp;
964
965 case BR_KEYTYPE_RSA:
966 break;
967 case BR_KEYTYPE_EC:
968 curve = sk->key.ec.curve;
969 supp = br_ec_get_default()->supported_curves;
970 if (curve > 31 || !((supp >> curve) & 1)) {
971 fprintf(stderr, "ERROR: private key curve (%d)"
972 " is not supported\n", curve);
973 goto server_exit_error;
974 }
975 break;
976 default:
977 fprintf(stderr, "ERROR: unsupported private key type (%d)\n",
978 sk->key_type);
979 break;
980 }
981 cert_signer_algo = get_cert_signer_algo(chain);
982 if (cert_signer_algo == 0) {
983 goto server_exit_error;
984 }
985 if (verbose) {
986 const char *csas;
987
988 switch (cert_signer_algo) {
989 case BR_KEYTYPE_RSA: csas = "RSA"; break;
990 case BR_KEYTYPE_EC: csas = "EC"; break;
991 default:
992 csas = "unknown";
993 break;
994 }
995 fprintf(stderr, "Issuing CA key type: %d (%s)\n",
996 cert_signer_algo, csas);
997 }
998 if (iobuf_len == 0) {
999 if (bidi) {
1000 iobuf_len = BR_SSL_BUFSIZE_BIDI;
1001 } else {
1002 iobuf_len = BR_SSL_BUFSIZE_MONO;
1003 }
1004 }
1005 iobuf = xmalloc(iobuf_len);
1006 if (cache_len == (size_t)-1) {
1007 cache_len = 5000;
1008 }
1009 cache = xmalloc(cache_len);
1010
1011 /*
1012 * Compute implementation requirements and inject implementations.
1013 */
1014 suite_ids = xmalloc(num_suites * sizeof *suite_ids);
1015 br_ssl_server_zero(&cc);
1016 br_ssl_engine_set_versions(&cc.eng, vmin, vmax);
1017 br_ssl_engine_set_all_flags(&cc.eng, flags);
1018 if (vmin <= BR_TLS11) {
1019 if (!(hfuns & (1 << br_md5_ID))) {
1020 fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need MD5\n");
1021 goto server_exit_error;
1022 }
1023 if (!(hfuns & (1 << br_sha1_ID))) {
1024 fprintf(stderr, "ERROR: TLS 1.0 and 1.1 need SHA-1\n");
1025 goto server_exit_error;
1026 }
1027 }
1028 for (u = 0; u < num_suites; u ++) {
1029 unsigned req;
1030
1031 req = suites[u].req;
1032 suite_ids[u] = suites[u].suite;
1033 if ((req & REQ_TLS12) != 0 && vmax < BR_TLS12) {
1034 fprintf(stderr,
1035 "ERROR: cipher suite %s requires TLS 1.2\n",
1036 suites[u].name);
1037 goto server_exit_error;
1038 }
1039 if ((req & REQ_SHA1) != 0 && !(hfuns & (1 << br_sha1_ID))) {
1040 fprintf(stderr,
1041 "ERROR: cipher suite %s requires SHA-1\n",
1042 suites[u].name);
1043 goto server_exit_error;
1044 }
1045 if ((req & REQ_SHA256) != 0 && !(hfuns & (1 << br_sha256_ID))) {
1046 fprintf(stderr,
1047 "ERROR: cipher suite %s requires SHA-256\n",
1048 suites[u].name);
1049 goto server_exit_error;
1050 }
1051 if ((req & REQ_SHA384) != 0 && !(hfuns & (1 << br_sha384_ID))) {
1052 fprintf(stderr,
1053 "ERROR: cipher suite %s requires SHA-384\n",
1054 suites[u].name);
1055 goto server_exit_error;
1056 }
1057 /* TODO: algorithm implementation selection */
1058 if ((req & REQ_AESCBC) != 0) {
1059 br_ssl_engine_set_default_aes_cbc(&cc.eng);
1060 }
1061 if ((req & REQ_AESCCM) != 0) {
1062 br_ssl_engine_set_default_aes_ccm(&cc.eng);
1063 }
1064 if ((req & REQ_AESGCM) != 0) {
1065 br_ssl_engine_set_default_aes_gcm(&cc.eng);
1066 }
1067 if ((req & REQ_CHAPOL) != 0) {
1068 br_ssl_engine_set_default_chapol(&cc.eng);
1069 }
1070 if ((req & REQ_3DESCBC) != 0) {
1071 br_ssl_engine_set_default_des_cbc(&cc.eng);
1072 }
1073 if ((req & (REQ_ECDHE_RSA | REQ_ECDHE_ECDSA)) != 0) {
1074 br_ssl_engine_set_default_ec(&cc.eng);
1075 }
1076 }
1077 br_ssl_engine_set_suites(&cc.eng, suite_ids, num_suites);
1078
1079 dnhash = NULL;
1080 for (u = 0; hash_functions[u].name; u ++) {
1081 const br_hash_class *hc;
1082 int id;
1083
1084 hc = hash_functions[u].hclass;
1085 id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
1086 if ((hfuns & ((unsigned)1 << id)) != 0) {
1087 dnhash = hc;
1088 br_ssl_engine_set_hash(&cc.eng, id, hc);
1089 }
1090 }
1091 if (vmin <= BR_TLS11) {
1092 br_ssl_engine_set_prf10(&cc.eng, &br_tls10_prf);
1093 }
1094 if (vmax >= BR_TLS12) {
1095 if ((hfuns & ((unsigned)1 << br_sha256_ID)) != 0) {
1096 br_ssl_engine_set_prf_sha256(&cc.eng,
1097 &br_tls12_sha256_prf);
1098 }
1099 if ((hfuns & ((unsigned)1 << br_sha384_ID)) != 0) {
1100 br_ssl_engine_set_prf_sha384(&cc.eng,
1101 &br_tls12_sha384_prf);
1102 }
1103 }
1104
1105 br_ssl_session_cache_lru_init(&lru, cache, cache_len);
1106 br_ssl_server_set_cache(&cc, &lru.vtable);
1107
1108 if (VEC_LEN(alpn_names) != 0) {
1109 br_ssl_engine_set_protocol_names(&cc.eng,
1110 (const char **)&VEC_ELT(alpn_names, 0),
1111 VEC_LEN(alpn_names));
1112 }
1113
1114 /*
1115 * Set the policy handler (that chooses the actual cipher suite,
1116 * selects the certificate chain, and runs the private key
1117 * operations).
1118 */
1119 pc.vtable = &policy_vtable;
1120 pc.verbose = verbose;
1121 pc.chain = chain;
1122 pc.chain_len = chain_len;
1123 pc.cert_signer_algo = cert_signer_algo;
1124 pc.sk = sk;
1125 pc.cbhash = cbhash;
1126 br_ssl_server_set_policy(&cc, &pc.vtable);
1127
1128 /*
1129 * If trust anchors have been configured, then set an X.509
1130 * validation engine and activate client certificate
1131 * authentication.
1132 */
1133 if (VEC_LEN(anchors) != 0) {
1134 br_x509_minimal_init(&xc, dnhash,
1135 &VEC_ELT(anchors, 0), VEC_LEN(anchors));
1136 for (u = 0; hash_functions[u].name; u ++) {
1137 const br_hash_class *hc;
1138 int id;
1139
1140 hc = hash_functions[u].hclass;
1141 id = (hc->desc >> BR_HASHDESC_ID_OFF)
1142 & BR_HASHDESC_ID_MASK;
1143 if ((hfuns & ((unsigned)1 << id)) != 0) {
1144 br_x509_minimal_set_hash(&xc, id, hc);
1145 }
1146 }
1147 br_ssl_engine_set_default_rsavrfy(&cc.eng);
1148 br_ssl_engine_set_default_ecdsa(&cc.eng);
1149 br_x509_minimal_set_rsa(&xc, br_rsa_pkcs1_vrfy_get_default());
1150 br_x509_minimal_set_ecdsa(&xc,
1151 br_ec_get_default(), br_ecdsa_vrfy_asn1_get_default());
1152 br_ssl_engine_set_x509(&cc.eng, &xc.vtable);
1153 br_ssl_server_set_trust_anchor_names_alt(&cc,
1154 &VEC_ELT(anchors, 0), VEC_LEN(anchors));
1155 }
1156
1157 br_ssl_engine_set_buffer(&cc.eng, iobuf, iobuf_len, bidi);
1158
1159 /*
1160 * On Unix systems, we need to ignore SIGPIPE.
1161 */
1162 #ifndef _WIN32
1163 signal(SIGPIPE, SIG_IGN);
1164 #endif
1165
1166 /*
1167 * Open the server socket.
1168 */
1169 server_fd = host_bind(bind_name, port, verbose);
1170 if (server_fd == INVALID_SOCKET) {
1171 goto server_exit_error;
1172 }
1173
1174 /*
1175 * Process incoming clients, one at a time. Note that we do not
1176 * accept any client until the previous connection has finished:
1177 * this is voluntary, since the tool uses stdin/stdout for
1178 * application data, and thus cannot really run two connections
1179 * simultaneously.
1180 */
1181 for (;;) {
1182 int x;
1183 unsigned run_flags;
1184
1185 fd = accept_client(server_fd, verbose, 1);
1186 if (fd == INVALID_SOCKET) {
1187 goto server_exit_error;
1188 }
1189 br_ssl_server_reset(&cc);
1190 run_flags = (verbose ? RUN_ENGINE_VERBOSE : 0)
1191 | (trace ? RUN_ENGINE_TRACE : 0);
1192 x = run_ssl_engine(&cc.eng, fd, run_flags);
1193 #ifdef _WIN32
1194 closesocket(fd);
1195 #else
1196 close(fd);
1197 #endif
1198 fd = INVALID_SOCKET;
1199 if (x < -1) {
1200 goto server_exit_error;
1201 }
1202 }
1203
1204 /*
1205 * Release allocated structures.
1206 */
1207 server_exit:
1208 xfree(suites);
1209 xfree(suite_ids);
1210 free_certificates(chain, chain_len);
1211 free_private_key(sk);
1212 VEC_CLEAREXT(anchors, &free_ta_contents);
1213 VEC_CLEAREXT(alpn_names, &free_alpn);
1214 xfree(iobuf);
1215 xfree(cache);
1216 if (fd != INVALID_SOCKET) {
1217 #ifdef _WIN32
1218 closesocket(fd);
1219 #else
1220 close(fd);
1221 #endif
1222 }
1223 return retcode;
1224
1225 server_exit_error:
1226 retcode = -1;
1227 goto server_exit;
1228 }
1229