1 /* $NetBSD: connect.c,v 1.1.1.2 2014/04/24 12:45:27 pettai Exp $ */
2
3 /*
4 * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "kdc_locl.h"
37
38 /* Should we enable the HTTP hack? */
39 int enable_http = -1;
40
41 /* Log over requests to the KDC */
42 const char *request_log;
43
44 /* A string describing on what ports to listen */
45 const char *port_str;
46
47 krb5_addresses explicit_addresses;
48
49 size_t max_request_udp;
50 size_t max_request_tcp;
51
52 /*
53 * a tuple describing on what to listen
54 */
55
56 struct port_desc{
57 int family;
58 int type;
59 int port;
60 };
61
62 /* the current ones */
63
64 static struct port_desc *ports;
65 static size_t num_ports;
66
67 /*
68 * add `family, port, protocol' to the list with duplicate suppresion.
69 */
70
71 static void
add_port(krb5_context context,int family,int port,const char * protocol)72 add_port(krb5_context context,
73 int family, int port, const char *protocol)
74 {
75 int type;
76 size_t i;
77
78 if(strcmp(protocol, "udp") == 0)
79 type = SOCK_DGRAM;
80 else if(strcmp(protocol, "tcp") == 0)
81 type = SOCK_STREAM;
82 else
83 return;
84 for(i = 0; i < num_ports; i++){
85 if(ports[i].type == type
86 && ports[i].port == port
87 && ports[i].family == family)
88 return;
89 }
90 ports = realloc(ports, (num_ports + 1) * sizeof(*ports));
91 if (ports == NULL)
92 krb5_err (context, 1, errno, "realloc");
93 ports[num_ports].family = family;
94 ports[num_ports].type = type;
95 ports[num_ports].port = port;
96 num_ports++;
97 }
98
99 /*
100 * add a triple but with service -> port lookup
101 * (this prints warnings for stuff that does not exist)
102 */
103
104 static void
add_port_service(krb5_context context,int family,const char * service,int port,const char * protocol)105 add_port_service(krb5_context context,
106 int family, const char *service, int port,
107 const char *protocol)
108 {
109 port = krb5_getportbyname (context, service, protocol, port);
110 add_port (context, family, port, protocol);
111 }
112
113 /*
114 * add the port with service -> port lookup or string -> number
115 * (no warning is printed)
116 */
117
118 static void
add_port_string(krb5_context context,int family,const char * str,const char * protocol)119 add_port_string (krb5_context context,
120 int family, const char *str, const char *protocol)
121 {
122 struct servent *sp;
123 int port;
124
125 sp = roken_getservbyname (str, protocol);
126 if (sp != NULL) {
127 port = sp->s_port;
128 } else {
129 char *end;
130
131 port = htons(strtol(str, &end, 0));
132 if (end == str)
133 return;
134 }
135 add_port (context, family, port, protocol);
136 }
137
138 /*
139 * add the standard collection of ports for `family'
140 */
141
142 static void
add_standard_ports(krb5_context context,krb5_kdc_configuration * config,int family)143 add_standard_ports (krb5_context context,
144 krb5_kdc_configuration *config,
145 int family)
146 {
147 add_port_service(context, family, "kerberos", 88, "udp");
148 add_port_service(context, family, "kerberos", 88, "tcp");
149 add_port_service(context, family, "kerberos-sec", 88, "udp");
150 add_port_service(context, family, "kerberos-sec", 88, "tcp");
151 if(enable_http)
152 add_port_service(context, family, "http", 80, "tcp");
153 if(config->enable_kx509) {
154 add_port_service(context, family, "kca_service", 9878, "udp");
155 add_port_service(context, family, "kca_service", 9878, "tcp");
156 }
157
158 }
159
160 /*
161 * parse the set of space-delimited ports in `str' and add them.
162 * "+" => all the standard ones
163 * otherwise it's port|service[/protocol]
164 */
165
166 static void
parse_ports(krb5_context context,krb5_kdc_configuration * config,const char * str)167 parse_ports(krb5_context context,
168 krb5_kdc_configuration *config,
169 const char *str)
170 {
171 char *pos = NULL;
172 char *p;
173 char *str_copy = strdup (str);
174
175 p = strtok_r(str_copy, " \t", &pos);
176 while(p != NULL) {
177 if(strcmp(p, "+") == 0) {
178 #ifdef HAVE_IPV6
179 add_standard_ports(context, config, AF_INET6);
180 #endif
181 add_standard_ports(context, config, AF_INET);
182 } else {
183 char *q = strchr(p, '/');
184 if(q){
185 *q++ = 0;
186 #ifdef HAVE_IPV6
187 add_port_string(context, AF_INET6, p, q);
188 #endif
189 add_port_string(context, AF_INET, p, q);
190 }else {
191 #ifdef HAVE_IPV6
192 add_port_string(context, AF_INET6, p, "udp");
193 add_port_string(context, AF_INET6, p, "tcp");
194 #endif
195 add_port_string(context, AF_INET, p, "udp");
196 add_port_string(context, AF_INET, p, "tcp");
197 }
198 }
199
200 p = strtok_r(NULL, " \t", &pos);
201 }
202 free (str_copy);
203 }
204
205 /*
206 * every socket we listen on
207 */
208
209 struct descr {
210 krb5_socket_t s;
211 int type;
212 int port;
213 unsigned char *buf;
214 size_t size;
215 size_t len;
216 time_t timeout;
217 struct sockaddr_storage __ss;
218 struct sockaddr *sa;
219 socklen_t sock_len;
220 char addr_string[128];
221 };
222
223 static void
init_descr(struct descr * d)224 init_descr(struct descr *d)
225 {
226 memset(d, 0, sizeof(*d));
227 d->sa = (struct sockaddr *)&d->__ss;
228 d->s = rk_INVALID_SOCKET;
229 }
230
231 /*
232 * re-initialize all `n' ->sa in `d'.
233 */
234
235 static void
reinit_descrs(struct descr * d,int n)236 reinit_descrs (struct descr *d, int n)
237 {
238 int i;
239
240 for (i = 0; i < n; ++i)
241 d[i].sa = (struct sockaddr *)&d[i].__ss;
242 }
243
244 /*
245 * Create the socket (family, type, port) in `d'
246 */
247
248 static void
init_socket(krb5_context context,krb5_kdc_configuration * config,struct descr * d,krb5_address * a,int family,int type,int port)249 init_socket(krb5_context context,
250 krb5_kdc_configuration *config,
251 struct descr *d, krb5_address *a, int family, int type, int port)
252 {
253 krb5_error_code ret;
254 struct sockaddr_storage __ss;
255 struct sockaddr *sa = (struct sockaddr *)&__ss;
256 krb5_socklen_t sa_size = sizeof(__ss);
257
258 init_descr (d);
259
260 ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port);
261 if (ret) {
262 krb5_warn(context, ret, "krb5_addr2sockaddr");
263 rk_closesocket(d->s);
264 d->s = rk_INVALID_SOCKET;
265 return;
266 }
267
268 if (sa->sa_family != family)
269 return;
270
271 d->s = socket(family, type, 0);
272 if(rk_IS_BAD_SOCKET(d->s)){
273 krb5_warn(context, errno, "socket(%d, %d, 0)", family, type);
274 d->s = rk_INVALID_SOCKET;
275 return;
276 }
277 #if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
278 {
279 int one = 1;
280 setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
281 }
282 #endif
283 d->type = type;
284 d->port = port;
285
286 if(rk_IS_SOCKET_ERROR(bind(d->s, sa, sa_size))){
287 char a_str[256];
288 size_t len;
289
290 krb5_print_address (a, a_str, sizeof(a_str), &len);
291 krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port));
292 rk_closesocket(d->s);
293 d->s = rk_INVALID_SOCKET;
294 return;
295 }
296 if(type == SOCK_STREAM && rk_IS_SOCKET_ERROR(listen(d->s, SOMAXCONN))){
297 char a_str[256];
298 size_t len;
299
300 krb5_print_address (a, a_str, sizeof(a_str), &len);
301 krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port));
302 rk_closesocket(d->s);
303 d->s = rk_INVALID_SOCKET;
304 return;
305 }
306 }
307
308 /*
309 * Allocate descriptors for all the sockets that we should listen on
310 * and return the number of them.
311 */
312
313 static int
init_sockets(krb5_context context,krb5_kdc_configuration * config,struct descr ** desc)314 init_sockets(krb5_context context,
315 krb5_kdc_configuration *config,
316 struct descr **desc)
317 {
318 krb5_error_code ret;
319 size_t i, j;
320 struct descr *d;
321 int num = 0;
322 krb5_addresses addresses;
323
324 if (explicit_addresses.len) {
325 addresses = explicit_addresses;
326 } else {
327 ret = krb5_get_all_server_addrs (context, &addresses);
328 if (ret)
329 krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
330 }
331 parse_ports(context, config, port_str);
332 d = malloc(addresses.len * num_ports * sizeof(*d));
333 if (d == NULL)
334 krb5_errx(context, 1, "malloc(%lu) failed",
335 (unsigned long)num_ports * sizeof(*d));
336
337 for (i = 0; i < num_ports; i++){
338 for (j = 0; j < addresses.len; ++j) {
339 init_socket(context, config, &d[num], &addresses.val[j],
340 ports[i].family, ports[i].type, ports[i].port);
341 if(d[num].s != rk_INVALID_SOCKET){
342 char a_str[80];
343 size_t len;
344
345 krb5_print_address (&addresses.val[j], a_str,
346 sizeof(a_str), &len);
347
348 kdc_log(context, config, 5, "listening on %s port %u/%s",
349 a_str,
350 ntohs(ports[i].port),
351 (ports[i].type == SOCK_STREAM) ? "tcp" : "udp");
352 /* XXX */
353 num++;
354 }
355 }
356 }
357 krb5_free_addresses (context, &addresses);
358 d = realloc(d, num * sizeof(*d));
359 if (d == NULL && num != 0)
360 krb5_errx(context, 1, "realloc(%lu) failed",
361 (unsigned long)num * sizeof(*d));
362 reinit_descrs (d, num);
363 *desc = d;
364 return num;
365 }
366
367 /*
368 *
369 */
370
371 static const char *
descr_type(struct descr * d)372 descr_type(struct descr *d)
373 {
374 if (d->type == SOCK_DGRAM)
375 return "udp";
376 else if (d->type == SOCK_STREAM)
377 return "tcp";
378 return "unknown";
379 }
380
381 static void
addr_to_string(krb5_context context,struct sockaddr * addr,size_t addr_len,char * str,size_t len)382 addr_to_string(krb5_context context,
383 struct sockaddr *addr, size_t addr_len, char *str, size_t len)
384 {
385 krb5_address a;
386 if(krb5_sockaddr2address(context, addr, &a) == 0) {
387 if(krb5_print_address(&a, str, len, &len) == 0) {
388 krb5_free_address(context, &a);
389 return;
390 }
391 krb5_free_address(context, &a);
392 }
393 snprintf(str, len, "<family=%d>", addr->sa_family);
394 }
395
396 /*
397 *
398 */
399
400 static void
send_reply(krb5_context context,krb5_kdc_configuration * config,krb5_boolean prependlength,struct descr * d,krb5_data * reply)401 send_reply(krb5_context context,
402 krb5_kdc_configuration *config,
403 krb5_boolean prependlength,
404 struct descr *d,
405 krb5_data *reply)
406 {
407 kdc_log(context, config, 5,
408 "sending %lu bytes to %s", (unsigned long)reply->length,
409 d->addr_string);
410 if(prependlength){
411 unsigned char l[4];
412 l[0] = (reply->length >> 24) & 0xff;
413 l[1] = (reply->length >> 16) & 0xff;
414 l[2] = (reply->length >> 8) & 0xff;
415 l[3] = reply->length & 0xff;
416 if(rk_IS_SOCKET_ERROR(sendto(d->s, l, sizeof(l), 0, d->sa, d->sock_len))) {
417 kdc_log (context, config,
418 0, "sendto(%s): %s", d->addr_string,
419 strerror(rk_SOCK_ERRNO));
420 return;
421 }
422 }
423 if(rk_IS_SOCKET_ERROR(sendto(d->s, reply->data, reply->length, 0, d->sa, d->sock_len))) {
424 kdc_log (context, config, 0, "sendto(%s): %s", d->addr_string,
425 strerror(rk_SOCK_ERRNO));
426 return;
427 }
428 }
429
430 /*
431 * Handle the request in `buf, len' to socket `d'
432 */
433
434 static void
do_request(krb5_context context,krb5_kdc_configuration * config,void * buf,size_t len,krb5_boolean prependlength,struct descr * d)435 do_request(krb5_context context,
436 krb5_kdc_configuration *config,
437 void *buf, size_t len, krb5_boolean prependlength,
438 struct descr *d)
439 {
440 krb5_error_code ret;
441 krb5_data reply;
442 int datagram_reply = (d->type == SOCK_DGRAM);
443
444 krb5_kdc_update_time(NULL);
445
446 krb5_data_zero(&reply);
447 ret = krb5_kdc_process_request(context, config,
448 buf, len, &reply, &prependlength,
449 d->addr_string, d->sa,
450 datagram_reply);
451 if(request_log)
452 krb5_kdc_save_request(context, request_log, buf, len, &reply, d->sa);
453 if(reply.length){
454 send_reply(context, config, prependlength, d, &reply);
455 krb5_data_free(&reply);
456 }
457 if(ret)
458 kdc_log(context, config, 0,
459 "Failed processing %lu byte request from %s",
460 (unsigned long)len, d->addr_string);
461 }
462
463 /*
464 * Handle incoming data to the UDP socket in `d'
465 */
466
467 static void
handle_udp(krb5_context context,krb5_kdc_configuration * config,struct descr * d)468 handle_udp(krb5_context context,
469 krb5_kdc_configuration *config,
470 struct descr *d)
471 {
472 unsigned char *buf;
473 ssize_t n;
474
475 buf = malloc(max_request_udp);
476 if(buf == NULL){
477 kdc_log(context, config, 0, "Failed to allocate %lu bytes", (unsigned long)max_request_udp);
478 return;
479 }
480
481 d->sock_len = sizeof(d->__ss);
482 n = recvfrom(d->s, buf, max_request_udp, 0, d->sa, &d->sock_len);
483 if(rk_IS_SOCKET_ERROR(n))
484 krb5_warn(context, rk_SOCK_ERRNO, "recvfrom");
485 else {
486 addr_to_string (context, d->sa, d->sock_len,
487 d->addr_string, sizeof(d->addr_string));
488 if ((size_t)n == max_request_udp) {
489 krb5_data data;
490 krb5_warn(context, errno,
491 "recvfrom: truncated packet from %s, asking for TCP",
492 d->addr_string);
493 krb5_mk_error(context,
494 KRB5KRB_ERR_RESPONSE_TOO_BIG,
495 NULL,
496 NULL,
497 NULL,
498 NULL,
499 NULL,
500 NULL,
501 &data);
502 send_reply(context, config, FALSE, d, &data);
503 krb5_data_free(&data);
504 } else {
505 do_request(context, config, buf, n, FALSE, d);
506 }
507 }
508 free (buf);
509 }
510
511 static void
clear_descr(struct descr * d)512 clear_descr(struct descr *d)
513 {
514 if(d->buf)
515 memset(d->buf, 0, d->size);
516 d->len = 0;
517 if(d->s != rk_INVALID_SOCKET)
518 rk_closesocket(d->s);
519 d->s = rk_INVALID_SOCKET;
520 }
521
522
523 /* remove HTTP %-quoting from buf */
524 static int
de_http(char * buf)525 de_http(char *buf)
526 {
527 unsigned char *p, *q;
528 for(p = q = (unsigned char *)buf; *p; p++, q++) {
529 if(*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
530 unsigned int x;
531 if(sscanf((char *)p + 1, "%2x", &x) != 1)
532 return -1;
533 *q = x;
534 p += 2;
535 } else
536 *q = *p;
537 }
538 *q = '\0';
539 return 0;
540 }
541
542 #define TCP_TIMEOUT 4
543
544 /*
545 * accept a new TCP connection on `d[parent]' and store it in `d[child]'
546 */
547
548 static void
add_new_tcp(krb5_context context,krb5_kdc_configuration * config,struct descr * d,int parent,int child)549 add_new_tcp (krb5_context context,
550 krb5_kdc_configuration *config,
551 struct descr *d, int parent, int child)
552 {
553 krb5_socket_t s;
554
555 if (child == -1)
556 return;
557
558 d[child].sock_len = sizeof(d[child].__ss);
559 s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
560 if(rk_IS_BAD_SOCKET(s)) {
561 krb5_warn(context, rk_SOCK_ERRNO, "accept");
562 return;
563 }
564
565 #ifdef FD_SETSIZE
566 if (s >= FD_SETSIZE) {
567 krb5_warnx(context, "socket FD too large");
568 rk_closesocket (s);
569 return;
570 }
571 #endif
572
573 d[child].s = s;
574 d[child].timeout = time(NULL) + TCP_TIMEOUT;
575 d[child].type = SOCK_STREAM;
576 addr_to_string (context,
577 d[child].sa, d[child].sock_len,
578 d[child].addr_string, sizeof(d[child].addr_string));
579 }
580
581 /*
582 * Grow `d' to handle at least `n'.
583 * Return != 0 if fails
584 */
585
586 static int
grow_descr(krb5_context context,krb5_kdc_configuration * config,struct descr * d,size_t n)587 grow_descr (krb5_context context,
588 krb5_kdc_configuration *config,
589 struct descr *d, size_t n)
590 {
591 if (d->size - d->len < n) {
592 unsigned char *tmp;
593 size_t grow;
594
595 grow = max(1024, d->len + n);
596 if (d->size + grow > max_request_tcp) {
597 kdc_log(context, config, 0, "Request exceeds max request size (%lu bytes).",
598 (unsigned long)d->size + grow);
599 clear_descr(d);
600 return -1;
601 }
602 tmp = realloc (d->buf, d->size + grow);
603 if (tmp == NULL) {
604 kdc_log(context, config, 0, "Failed to re-allocate %lu bytes.",
605 (unsigned long)d->size + grow);
606 clear_descr(d);
607 return -1;
608 }
609 d->size += grow;
610 d->buf = tmp;
611 }
612 return 0;
613 }
614
615 /*
616 * Try to handle the TCP data at `d->buf, d->len'.
617 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
618 */
619
620 static int
handle_vanilla_tcp(krb5_context context,krb5_kdc_configuration * config,struct descr * d)621 handle_vanilla_tcp (krb5_context context,
622 krb5_kdc_configuration *config,
623 struct descr *d)
624 {
625 krb5_storage *sp;
626 uint32_t len;
627
628 sp = krb5_storage_from_mem(d->buf, d->len);
629 if (sp == NULL) {
630 kdc_log (context, config, 0, "krb5_storage_from_mem failed");
631 return -1;
632 }
633 krb5_ret_uint32(sp, &len);
634 krb5_storage_free(sp);
635 if(d->len - 4 >= len) {
636 memmove(d->buf, d->buf + 4, d->len - 4);
637 d->len -= 4;
638 return 1;
639 }
640 return 0;
641 }
642
643 /*
644 * Try to handle the TCP/HTTP data at `d->buf, d->len'.
645 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
646 */
647
648 static int
handle_http_tcp(krb5_context context,krb5_kdc_configuration * config,struct descr * d)649 handle_http_tcp (krb5_context context,
650 krb5_kdc_configuration *config,
651 struct descr *d)
652 {
653 char *s, *p, *t;
654 void *data;
655 char *proto;
656 int len;
657
658 s = (char *)d->buf;
659
660 /* If its a multi line query, truncate off the first line */
661 p = strstr(s, "\r\n");
662 if (p)
663 *p = 0;
664
665 p = NULL;
666 t = strtok_r(s, " \t", &p);
667 if (t == NULL) {
668 kdc_log(context, config, 0,
669 "Missing HTTP operand (GET) request from %s", d->addr_string);
670 return -1;
671 }
672
673 t = strtok_r(NULL, " \t", &p);
674 if(t == NULL) {
675 kdc_log(context, config, 0,
676 "Missing HTTP GET data in request from %s", d->addr_string);
677 return -1;
678 }
679
680 data = malloc(strlen(t));
681 if (data == NULL) {
682 kdc_log(context, config, 0, "Failed to allocate %lu bytes",
683 (unsigned long)strlen(t));
684 return -1;
685 }
686 if(*t == '/')
687 t++;
688 if(de_http(t) != 0) {
689 kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string);
690 kdc_log(context, config, 5, "HTTP request: %s", t);
691 free(data);
692 return -1;
693 }
694 proto = strtok_r(NULL, " \t", &p);
695 if (proto == NULL) {
696 kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string);
697 free(data);
698 return -1;
699 }
700 len = base64_decode(t, data);
701 if(len <= 0){
702 const char *msg =
703 " 404 Not found\r\n"
704 "Server: Heimdal/" VERSION "\r\n"
705 "Cache-Control: no-cache\r\n"
706 "Pragma: no-cache\r\n"
707 "Content-type: text/html\r\n"
708 "Content-transfer-encoding: 8bit\r\n\r\n"
709 "<TITLE>404 Not found</TITLE>\r\n"
710 "<H1>404 Not found</H1>\r\n"
711 "That page doesn't exist, maybe you are looking for "
712 "<A HREF=\"http://www.h5l.org/\">Heimdal</A>?\r\n";
713 kdc_log(context, config, 0, "HTTP request from %s is non KDC request", d->addr_string);
714 kdc_log(context, config, 5, "HTTP request: %s", t);
715 free(data);
716 if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) {
717 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
718 d->addr_string, strerror(rk_SOCK_ERRNO));
719 return -1;
720 }
721 if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) {
722 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
723 d->addr_string, strerror(rk_SOCK_ERRNO));
724 return -1;
725 }
726 return -1;
727 }
728 {
729 const char *msg =
730 " 200 OK\r\n"
731 "Server: Heimdal/" VERSION "\r\n"
732 "Cache-Control: no-cache\r\n"
733 "Pragma: no-cache\r\n"
734 "Content-type: application/octet-stream\r\n"
735 "Content-transfer-encoding: binary\r\n\r\n";
736 if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) {
737 free(data);
738 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
739 d->addr_string, strerror(rk_SOCK_ERRNO));
740 return -1;
741 }
742 if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) {
743 free(data);
744 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
745 d->addr_string, strerror(rk_SOCK_ERRNO));
746 return -1;
747 }
748 }
749 if ((size_t)len > d->len)
750 len = d->len;
751 memcpy(d->buf, data, len);
752 d->len = len;
753 free(data);
754 return 1;
755 }
756
757 /*
758 * Handle incoming data to the TCP socket in `d[index]'
759 */
760
761 static void
handle_tcp(krb5_context context,krb5_kdc_configuration * config,struct descr * d,int idx,int min_free)762 handle_tcp(krb5_context context,
763 krb5_kdc_configuration *config,
764 struct descr *d, int idx, int min_free)
765 {
766 unsigned char buf[1024];
767 int n;
768 int ret = 0;
769
770 if (d[idx].timeout == 0) {
771 add_new_tcp (context, config, d, idx, min_free);
772 return;
773 }
774
775 n = recvfrom(d[idx].s, buf, sizeof(buf), 0, NULL, NULL);
776 if(rk_IS_SOCKET_ERROR(n)){
777 krb5_warn(context, rk_SOCK_ERRNO, "recvfrom failed from %s to %s/%d",
778 d[idx].addr_string, descr_type(d + idx),
779 ntohs(d[idx].port));
780 return;
781 } else if (n == 0) {
782 krb5_warnx(context, "connection closed before end of data after %lu "
783 "bytes from %s to %s/%d", (unsigned long)d[idx].len,
784 d[idx].addr_string, descr_type(d + idx),
785 ntohs(d[idx].port));
786 clear_descr (d + idx);
787 return;
788 }
789 if (grow_descr (context, config, &d[idx], n))
790 return;
791 memcpy(d[idx].buf + d[idx].len, buf, n);
792 d[idx].len += n;
793 if(d[idx].len > 4 && d[idx].buf[0] == 0) {
794 ret = handle_vanilla_tcp (context, config, &d[idx]);
795 } else if(enable_http &&
796 d[idx].len >= 4 &&
797 strncmp((char *)d[idx].buf, "GET ", 4) == 0 &&
798 strncmp((char *)d[idx].buf + d[idx].len - 4,
799 "\r\n\r\n", 4) == 0) {
800
801 /* remove the trailing \r\n\r\n so the string is NUL terminated */
802 d[idx].buf[d[idx].len - 4] = '\0';
803
804 ret = handle_http_tcp (context, config, &d[idx]);
805 if (ret < 0)
806 clear_descr (d + idx);
807 } else if (d[idx].len > 4) {
808 kdc_log (context, config,
809 0, "TCP data of strange type from %s to %s/%d",
810 d[idx].addr_string, descr_type(d + idx),
811 ntohs(d[idx].port));
812 if (d[idx].buf[0] & 0x80) {
813 krb5_data reply;
814
815 kdc_log (context, config, 0, "TCP extension not supported");
816
817 ret = krb5_mk_error(context,
818 KRB5KRB_ERR_FIELD_TOOLONG,
819 NULL,
820 NULL,
821 NULL,
822 NULL,
823 NULL,
824 NULL,
825 &reply);
826 if (ret == 0) {
827 send_reply(context, config, TRUE, d + idx, &reply);
828 krb5_data_free(&reply);
829 }
830 }
831 clear_descr(d + idx);
832 return;
833 }
834 if (ret < 0)
835 return;
836 else if (ret == 1) {
837 do_request(context, config,
838 d[idx].buf, d[idx].len, TRUE, &d[idx]);
839 clear_descr(d + idx);
840 }
841 }
842
843 krb5_boolean
realloc_descrs(struct descr ** d,unsigned int * ndescr)844 realloc_descrs(struct descr **d, unsigned int *ndescr)
845 {
846 struct descr *tmp;
847 size_t i;
848
849 tmp = realloc(*d, (*ndescr + 4) * sizeof(**d));
850 if(tmp == NULL)
851 return FALSE;
852
853 *d = tmp;
854 reinit_descrs (*d, *ndescr);
855 memset(*d + *ndescr, 0, 4 * sizeof(**d));
856 for(i = *ndescr; i < *ndescr + 4; i++)
857 init_descr (*d + i);
858
859 *ndescr += 4;
860
861 return TRUE;
862 }
863
864 int
next_min_free(krb5_context context,struct descr ** d,unsigned int * ndescr)865 next_min_free(krb5_context context, struct descr **d, unsigned int *ndescr)
866 {
867 size_t i;
868 int min_free;
869
870 for(i = 0; i < *ndescr; i++) {
871 int s = (*d + i)->s;
872 if(rk_IS_BAD_SOCKET(s))
873 return i;
874 }
875
876 min_free = *ndescr;
877 if(!realloc_descrs(d, ndescr)) {
878 min_free = -1;
879 krb5_warnx(context, "No memory");
880 }
881
882 return min_free;
883 }
884
885 void
loop(krb5_context context,krb5_kdc_configuration * config)886 loop(krb5_context context,
887 krb5_kdc_configuration *config)
888 {
889 struct descr *d;
890 unsigned int ndescr;
891
892 ndescr = init_sockets(context, config, &d);
893 if(ndescr <= 0)
894 krb5_errx(context, 1, "No sockets!");
895 kdc_log(context, config, 0, "KDC started");
896 while(exit_flag == 0){
897 struct timeval tmout;
898 fd_set fds;
899 int min_free = -1;
900 int max_fd = 0;
901 size_t i;
902
903 FD_ZERO(&fds);
904 for(i = 0; i < ndescr; i++) {
905 if(!rk_IS_BAD_SOCKET(d[i].s)){
906 if(d[i].type == SOCK_STREAM &&
907 d[i].timeout && d[i].timeout < time(NULL)) {
908 kdc_log(context, config, 1,
909 "TCP-connection from %s expired after %lu bytes",
910 d[i].addr_string, (unsigned long)d[i].len);
911 clear_descr(&d[i]);
912 continue;
913 }
914 #ifndef NO_LIMIT_FD_SETSIZE
915 if(max_fd < d[i].s)
916 max_fd = d[i].s;
917 #ifdef FD_SETSIZE
918 if (max_fd >= FD_SETSIZE)
919 krb5_errx(context, 1, "fd too large");
920 #endif
921 #endif
922 FD_SET(d[i].s, &fds);
923 }
924 }
925
926 tmout.tv_sec = TCP_TIMEOUT;
927 tmout.tv_usec = 0;
928 switch(select(max_fd + 1, &fds, 0, 0, &tmout)){
929 case 0:
930 break;
931 case -1:
932 if (errno != EINTR)
933 krb5_warn(context, rk_SOCK_ERRNO, "select");
934 break;
935 default:
936 for(i = 0; i < ndescr; i++)
937 if(!rk_IS_BAD_SOCKET(d[i].s) && FD_ISSET(d[i].s, &fds)) {
938 min_free = next_min_free(context, &d, &ndescr);
939
940 if(d[i].type == SOCK_DGRAM)
941 handle_udp(context, config, &d[i]);
942 else if(d[i].type == SOCK_STREAM)
943 handle_tcp(context, config, d, i, min_free);
944 }
945 }
946 }
947 if (0);
948 #ifdef SIGXCPU
949 else if(exit_flag == SIGXCPU)
950 kdc_log(context, config, 0, "CPU time limit exceeded");
951 #endif
952 else if(exit_flag == SIGINT || exit_flag == SIGTERM)
953 kdc_log(context, config, 0, "Terminated");
954 else
955 kdc_log(context, config, 0, "Unexpected exit reason: %d", exit_flag);
956 free (d);
957 }
958