source: heimdal/trunk/kdc/connect.c@ 5

Last change on this file since 5 was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 22.9 KB
Line 
1/*
2 * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "kdc_locl.h"
35
36/* Should we enable the HTTP hack? */
37int enable_http = -1;
38
39/* Log over requests to the KDC */
40const char *request_log;
41
42/* A string describing on what ports to listen */
43const char *port_str;
44
45krb5_addresses explicit_addresses;
46
47size_t max_request_udp;
48size_t max_request_tcp;
49
50/*
51 * a tuple describing on what to listen
52 */
53
54struct port_desc{
55 int family;
56 int type;
57 int port;
58};
59
60/* the current ones */
61
62static struct port_desc *ports;
63static size_t num_ports;
64
65/*
66 * add `family, port, protocol' to the list with duplicate suppresion.
67 */
68
69static void
70add_port(krb5_context context,
71 int family, int port, const char *protocol)
72{
73 int type;
74 size_t i;
75
76 if(strcmp(protocol, "udp") == 0)
77 type = SOCK_DGRAM;
78 else if(strcmp(protocol, "tcp") == 0)
79 type = SOCK_STREAM;
80 else
81 return;
82 for(i = 0; i < num_ports; i++){
83 if(ports[i].type == type
84 && ports[i].port == port
85 && ports[i].family == family)
86 return;
87 }
88 ports = realloc(ports, (num_ports + 1) * sizeof(*ports));
89 if (ports == NULL)
90 krb5_err (context, 1, errno, "realloc");
91 ports[num_ports].family = family;
92 ports[num_ports].type = type;
93 ports[num_ports].port = port;
94 num_ports++;
95}
96
97/*
98 * add a triple but with service -> port lookup
99 * (this prints warnings for stuff that does not exist)
100 */
101
102static void
103add_port_service(krb5_context context,
104 int family, const char *service, int port,
105 const char *protocol)
106{
107 port = krb5_getportbyname (context, service, protocol, port);
108 add_port (context, family, port, protocol);
109}
110
111/*
112 * add the port with service -> port lookup or string -> number
113 * (no warning is printed)
114 */
115
116static void
117add_port_string (krb5_context context,
118 int family, const char *str, const char *protocol)
119{
120 struct servent *sp;
121 int port;
122
123 sp = roken_getservbyname (str, protocol);
124 if (sp != NULL) {
125 port = sp->s_port;
126 } else {
127 char *end;
128
129 port = htons(strtol(str, &end, 0));
130 if (end == str)
131 return;
132 }
133 add_port (context, family, port, protocol);
134}
135
136/*
137 * add the standard collection of ports for `family'
138 */
139
140static void
141add_standard_ports (krb5_context context,
142 krb5_kdc_configuration *config,
143 int family)
144{
145 add_port_service(context, family, "kerberos", 88, "udp");
146 add_port_service(context, family, "kerberos", 88, "tcp");
147 add_port_service(context, family, "kerberos-sec", 88, "udp");
148 add_port_service(context, family, "kerberos-sec", 88, "tcp");
149 if(enable_http)
150 add_port_service(context, family, "http", 80, "tcp");
151 if(config->enable_kx509) {
152 add_port_service(context, family, "kca_service", 9878, "udp");
153 add_port_service(context, family, "kca_service", 9878, "tcp");
154 }
155
156}
157
158/*
159 * parse the set of space-delimited ports in `str' and add them.
160 * "+" => all the standard ones
161 * otherwise it's port|service[/protocol]
162 */
163
164static void
165parse_ports(krb5_context context,
166 krb5_kdc_configuration *config,
167 const char *str)
168{
169 char *pos = NULL;
170 char *p;
171 char *str_copy = strdup (str);
172
173 p = strtok_r(str_copy, " \t", &pos);
174 while(p != NULL) {
175 if(strcmp(p, "+") == 0) {
176#ifdef HAVE_IPV6
177 add_standard_ports(context, config, AF_INET6);
178#endif
179 add_standard_ports(context, config, AF_INET);
180 } else {
181 char *q = strchr(p, '/');
182 if(q){
183 *q++ = 0;
184#ifdef HAVE_IPV6
185 add_port_string(context, AF_INET6, p, q);
186#endif
187 add_port_string(context, AF_INET, p, q);
188 }else {
189#ifdef HAVE_IPV6
190 add_port_string(context, AF_INET6, p, "udp");
191 add_port_string(context, AF_INET6, p, "tcp");
192#endif
193 add_port_string(context, AF_INET, p, "udp");
194 add_port_string(context, AF_INET, p, "tcp");
195 }
196 }
197
198 p = strtok_r(NULL, " \t", &pos);
199 }
200 free (str_copy);
201}
202
203/*
204 * every socket we listen on
205 */
206
207struct descr {
208 krb5_socket_t s;
209 int type;
210 int port;
211 unsigned char *buf;
212 size_t size;
213 size_t len;
214 time_t timeout;
215 struct sockaddr_storage __ss;
216 struct sockaddr *sa;
217 socklen_t sock_len;
218 char addr_string[128];
219};
220
221static void
222init_descr(struct descr *d)
223{
224 memset(d, 0, sizeof(*d));
225 d->sa = (struct sockaddr *)&d->__ss;
226 d->s = rk_INVALID_SOCKET;
227}
228
229/*
230 * re-initialize all `n' ->sa in `d'.
231 */
232
233static void
234reinit_descrs (struct descr *d, int n)
235{
236 int i;
237
238 for (i = 0; i < n; ++i)
239 d[i].sa = (struct sockaddr *)&d[i].__ss;
240}
241
242/*
243 * Create the socket (family, type, port) in `d'
244 */
245
246static void
247init_socket(krb5_context context,
248 krb5_kdc_configuration *config,
249 struct descr *d, krb5_address *a, int family, int type, int port)
250{
251 krb5_error_code ret;
252 struct sockaddr_storage __ss;
253 struct sockaddr *sa = (struct sockaddr *)&__ss;
254 krb5_socklen_t sa_size = sizeof(__ss);
255
256 init_descr (d);
257
258 ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port);
259 if (ret) {
260 krb5_warn(context, ret, "krb5_addr2sockaddr");
261 rk_closesocket(d->s);
262 d->s = rk_INVALID_SOCKET;
263 return;
264 }
265
266 if (sa->sa_family != family)
267 return;
268
269 d->s = socket(family, type, 0);
270 if(rk_IS_BAD_SOCKET(d->s)){
271 krb5_warn(context, errno, "socket(%d, %d, 0)", family, type);
272 d->s = rk_INVALID_SOCKET;
273 return;
274 }
275#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
276 {
277 int one = 1;
278 setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
279 }
280#endif
281 d->type = type;
282 d->port = port;
283
284 if(rk_IS_SOCKET_ERROR(bind(d->s, sa, sa_size))){
285 char a_str[256];
286 size_t len;
287
288 krb5_print_address (a, a_str, sizeof(a_str), &len);
289 krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port));
290 rk_closesocket(d->s);
291 d->s = rk_INVALID_SOCKET;
292 return;
293 }
294 if(type == SOCK_STREAM && rk_IS_SOCKET_ERROR(listen(d->s, SOMAXCONN))){
295 char a_str[256];
296 size_t len;
297
298 krb5_print_address (a, a_str, sizeof(a_str), &len);
299 krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port));
300 rk_closesocket(d->s);
301 d->s = rk_INVALID_SOCKET;
302 return;
303 }
304}
305
306/*
307 * Allocate descriptors for all the sockets that we should listen on
308 * and return the number of them.
309 */
310
311static int
312init_sockets(krb5_context context,
313 krb5_kdc_configuration *config,
314 struct descr **desc)
315{
316 krb5_error_code ret;
317 size_t i, j;
318 struct descr *d;
319 int num = 0;
320 krb5_addresses addresses;
321
322 if (explicit_addresses.len) {
323 addresses = explicit_addresses;
324 } else {
325 ret = krb5_get_all_server_addrs (context, &addresses);
326 if (ret)
327 krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
328 }
329 parse_ports(context, config, port_str);
330 d = malloc(addresses.len * num_ports * sizeof(*d));
331 if (d == NULL)
332 krb5_errx(context, 1, "malloc(%lu) failed",
333 (unsigned long)num_ports * sizeof(*d));
334
335 for (i = 0; i < num_ports; i++){
336 for (j = 0; j < addresses.len; ++j) {
337 init_socket(context, config, &d[num], &addresses.val[j],
338 ports[i].family, ports[i].type, ports[i].port);
339 if(d[num].s != rk_INVALID_SOCKET){
340 char a_str[80];
341 size_t len;
342
343 krb5_print_address (&addresses.val[j], a_str,
344 sizeof(a_str), &len);
345
346 kdc_log(context, config, 5, "listening on %s port %u/%s",
347 a_str,
348 ntohs(ports[i].port),
349 (ports[i].type == SOCK_STREAM) ? "tcp" : "udp");
350 /* XXX */
351 num++;
352 }
353 }
354 }
355 krb5_free_addresses (context, &addresses);
356 d = realloc(d, num * sizeof(*d));
357 if (d == NULL && num != 0)
358 krb5_errx(context, 1, "realloc(%lu) failed",
359 (unsigned long)num * sizeof(*d));
360 reinit_descrs (d, num);
361 *desc = d;
362 return num;
363}
364
365/*
366 *
367 */
368
369static const char *
370descr_type(struct descr *d)
371{
372 if (d->type == SOCK_DGRAM)
373 return "udp";
374 else if (d->type == SOCK_STREAM)
375 return "tcp";
376 return "unknown";
377}
378
379static void
380addr_to_string(krb5_context context,
381 struct sockaddr *addr, size_t addr_len, char *str, size_t len)
382{
383 krb5_address a;
384 if(krb5_sockaddr2address(context, addr, &a) == 0) {
385 if(krb5_print_address(&a, str, len, &len) == 0) {
386 krb5_free_address(context, &a);
387 return;
388 }
389 krb5_free_address(context, &a);
390 }
391 snprintf(str, len, "<family=%d>", addr->sa_family);
392}
393
394/*
395 *
396 */
397
398static void
399send_reply(krb5_context context,
400 krb5_kdc_configuration *config,
401 krb5_boolean prependlength,
402 struct descr *d,
403 krb5_data *reply)
404{
405 kdc_log(context, config, 5,
406 "sending %lu bytes to %s", (unsigned long)reply->length,
407 d->addr_string);
408 if(prependlength){
409 unsigned char l[4];
410 l[0] = (reply->length >> 24) & 0xff;
411 l[1] = (reply->length >> 16) & 0xff;
412 l[2] = (reply->length >> 8) & 0xff;
413 l[3] = reply->length & 0xff;
414 if(rk_IS_SOCKET_ERROR(sendto(d->s, l, sizeof(l), 0, d->sa, d->sock_len))) {
415 kdc_log (context, config,
416 0, "sendto(%s): %s", d->addr_string,
417 strerror(rk_SOCK_ERRNO));
418 return;
419 }
420 }
421 if(rk_IS_SOCKET_ERROR(sendto(d->s, reply->data, reply->length, 0, d->sa, d->sock_len))) {
422 kdc_log (context, config, 0, "sendto(%s): %s", d->addr_string,
423 strerror(rk_SOCK_ERRNO));
424 return;
425 }
426}
427
428/*
429 * Handle the request in `buf, len' to socket `d'
430 */
431
432static void
433do_request(krb5_context context,
434 krb5_kdc_configuration *config,
435 void *buf, size_t len, krb5_boolean prependlength,
436 struct descr *d)
437{
438 krb5_error_code ret;
439 krb5_data reply;
440 int datagram_reply = (d->type == SOCK_DGRAM);
441
442 krb5_kdc_update_time(NULL);
443
444 krb5_data_zero(&reply);
445 ret = krb5_kdc_process_request(context, config,
446 buf, len, &reply, &prependlength,
447 d->addr_string, d->sa,
448 datagram_reply);
449 if(request_log)
450 krb5_kdc_save_request(context, request_log, buf, len, &reply, d->sa);
451 if(reply.length){
452 send_reply(context, config, prependlength, d, &reply);
453 krb5_data_free(&reply);
454 }
455 if(ret)
456 kdc_log(context, config, 0,
457 "Failed processing %lu byte request from %s",
458 (unsigned long)len, d->addr_string);
459}
460
461/*
462 * Handle incoming data to the UDP socket in `d'
463 */
464
465static void
466handle_udp(krb5_context context,
467 krb5_kdc_configuration *config,
468 struct descr *d)
469{
470 unsigned char *buf;
471 ssize_t n;
472
473 buf = malloc(max_request_udp);
474 if(buf == NULL){
475 kdc_log(context, config, 0, "Failed to allocate %lu bytes", (unsigned long)max_request_udp);
476 return;
477 }
478
479 d->sock_len = sizeof(d->__ss);
480 n = recvfrom(d->s, buf, max_request_udp, 0, d->sa, &d->sock_len);
481 if(rk_IS_SOCKET_ERROR(n))
482 krb5_warn(context, rk_SOCK_ERRNO, "recvfrom");
483 else {
484 addr_to_string (context, d->sa, d->sock_len,
485 d->addr_string, sizeof(d->addr_string));
486 if ((size_t)n == max_request_udp) {
487 krb5_data data;
488 krb5_warn(context, errno,
489 "recvfrom: truncated packet from %s, asking for TCP",
490 d->addr_string);
491 krb5_mk_error(context,
492 KRB5KRB_ERR_RESPONSE_TOO_BIG,
493 NULL,
494 NULL,
495 NULL,
496 NULL,
497 NULL,
498 NULL,
499 &data);
500 send_reply(context, config, FALSE, d, &data);
501 krb5_data_free(&data);
502 } else {
503 do_request(context, config, buf, n, FALSE, d);
504 }
505 }
506 free (buf);
507}
508
509static void
510clear_descr(struct descr *d)
511{
512 if(d->buf)
513 memset(d->buf, 0, d->size);
514 d->len = 0;
515 if(d->s != rk_INVALID_SOCKET)
516 rk_closesocket(d->s);
517 d->s = rk_INVALID_SOCKET;
518}
519
520
521/* remove HTTP %-quoting from buf */
522static int
523de_http(char *buf)
524{
525 unsigned char *p, *q;
526 for(p = q = (unsigned char *)buf; *p; p++, q++) {
527 if(*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
528 unsigned int x;
529 if(sscanf((char *)p + 1, "%2x", &x) != 1)
530 return -1;
531 *q = x;
532 p += 2;
533 } else
534 *q = *p;
535 }
536 *q = '\0';
537 return 0;
538}
539
540#define TCP_TIMEOUT 4
541
542/*
543 * accept a new TCP connection on `d[parent]' and store it in `d[child]'
544 */
545
546static void
547add_new_tcp (krb5_context context,
548 krb5_kdc_configuration *config,
549 struct descr *d, int parent, int child)
550{
551 krb5_socket_t s;
552
553 if (child == -1)
554 return;
555
556 d[child].sock_len = sizeof(d[child].__ss);
557 s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
558 if(rk_IS_BAD_SOCKET(s)) {
559 krb5_warn(context, rk_SOCK_ERRNO, "accept");
560 return;
561 }
562
563#ifdef FD_SETSIZE
564 if (s >= FD_SETSIZE) {
565 krb5_warnx(context, "socket FD too large");
566 rk_closesocket (s);
567 return;
568 }
569#endif
570
571 d[child].s = s;
572 d[child].timeout = time(NULL) + TCP_TIMEOUT;
573 d[child].type = SOCK_STREAM;
574 addr_to_string (context,
575 d[child].sa, d[child].sock_len,
576 d[child].addr_string, sizeof(d[child].addr_string));
577}
578
579/*
580 * Grow `d' to handle at least `n'.
581 * Return != 0 if fails
582 */
583
584static int
585grow_descr (krb5_context context,
586 krb5_kdc_configuration *config,
587 struct descr *d, size_t n)
588{
589 if (d->size - d->len < n) {
590 unsigned char *tmp;
591 size_t grow;
592
593 grow = max(1024, d->len + n);
594 if (d->size + grow > max_request_tcp) {
595 kdc_log(context, config, 0, "Request exceeds max request size (%lu bytes).",
596 (unsigned long)d->size + grow);
597 clear_descr(d);
598 return -1;
599 }
600 tmp = realloc (d->buf, d->size + grow);
601 if (tmp == NULL) {
602 kdc_log(context, config, 0, "Failed to re-allocate %lu bytes.",
603 (unsigned long)d->size + grow);
604 clear_descr(d);
605 return -1;
606 }
607 d->size += grow;
608 d->buf = tmp;
609 }
610 return 0;
611}
612
613/*
614 * Try to handle the TCP data at `d->buf, d->len'.
615 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
616 */
617
618static int
619handle_vanilla_tcp (krb5_context context,
620 krb5_kdc_configuration *config,
621 struct descr *d)
622{
623 krb5_storage *sp;
624 uint32_t len;
625
626 sp = krb5_storage_from_mem(d->buf, d->len);
627 if (sp == NULL) {
628 kdc_log (context, config, 0, "krb5_storage_from_mem failed");
629 return -1;
630 }
631 krb5_ret_uint32(sp, &len);
632 krb5_storage_free(sp);
633 if(d->len - 4 >= len) {
634 memmove(d->buf, d->buf + 4, d->len - 4);
635 d->len -= 4;
636 return 1;
637 }
638 return 0;
639}
640
641/*
642 * Try to handle the TCP/HTTP data at `d->buf, d->len'.
643 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
644 */
645
646static int
647handle_http_tcp (krb5_context context,
648 krb5_kdc_configuration *config,
649 struct descr *d)
650{
651 char *s, *p, *t;
652 void *data;
653 char *proto;
654 int len;
655
656 s = (char *)d->buf;
657
658 /* If its a multi line query, truncate off the first line */
659 p = strstr(s, "\r\n");
660 if (p)
661 *p = 0;
662
663 p = NULL;
664 t = strtok_r(s, " \t", &p);
665 if (t == NULL) {
666 kdc_log(context, config, 0,
667 "Missing HTTP operand (GET) request from %s", d->addr_string);
668 return -1;
669 }
670
671 t = strtok_r(NULL, " \t", &p);
672 if(t == NULL) {
673 kdc_log(context, config, 0,
674 "Missing HTTP GET data in request from %s", d->addr_string);
675 return -1;
676 }
677
678 data = malloc(strlen(t));
679 if (data == NULL) {
680 kdc_log(context, config, 0, "Failed to allocate %lu bytes",
681 (unsigned long)strlen(t));
682 return -1;
683 }
684 if(*t == '/')
685 t++;
686 if(de_http(t) != 0) {
687 kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string);
688 kdc_log(context, config, 5, "HTTP request: %s", t);
689 free(data);
690 return -1;
691 }
692 proto = strtok_r(NULL, " \t", &p);
693 if (proto == NULL) {
694 kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string);
695 free(data);
696 return -1;
697 }
698 len = base64_decode(t, data);
699 if(len <= 0){
700 const char *msg =
701 " 404 Not found\r\n"
702 "Server: Heimdal/" VERSION "\r\n"
703 "Cache-Control: no-cache\r\n"
704 "Pragma: no-cache\r\n"
705 "Content-type: text/html\r\n"
706 "Content-transfer-encoding: 8bit\r\n\r\n"
707 "<TITLE>404 Not found</TITLE>\r\n"
708 "<H1>404 Not found</H1>\r\n"
709 "That page doesn't exist, maybe you are looking for "
710 "<A HREF=\"http://www.h5l.org/\">Heimdal</A>?\r\n";
711 kdc_log(context, config, 0, "HTTP request from %s is non KDC request", d->addr_string);
712 kdc_log(context, config, 5, "HTTP request: %s", t);
713 free(data);
714 if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) {
715 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
716 d->addr_string, strerror(rk_SOCK_ERRNO));
717 return -1;
718 }
719 if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) {
720 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
721 d->addr_string, strerror(rk_SOCK_ERRNO));
722 return -1;
723 }
724 return -1;
725 }
726 {
727 const char *msg =
728 " 200 OK\r\n"
729 "Server: Heimdal/" VERSION "\r\n"
730 "Cache-Control: no-cache\r\n"
731 "Pragma: no-cache\r\n"
732 "Content-type: application/octet-stream\r\n"
733 "Content-transfer-encoding: binary\r\n\r\n";
734 if (rk_IS_SOCKET_ERROR(send(d->s, proto, strlen(proto), 0))) {
735 free(data);
736 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
737 d->addr_string, strerror(rk_SOCK_ERRNO));
738 return -1;
739 }
740 if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) {
741 free(data);
742 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
743 d->addr_string, strerror(rk_SOCK_ERRNO));
744 return -1;
745 }
746 }
747 if ((size_t)len > d->len)
748 len = d->len;
749 memcpy(d->buf, data, len);
750 d->len = len;
751 free(data);
752 return 1;
753}
754
755/*
756 * Handle incoming data to the TCP socket in `d[index]'
757 */
758
759static void
760handle_tcp(krb5_context context,
761 krb5_kdc_configuration *config,
762 struct descr *d, int idx, int min_free)
763{
764 unsigned char buf[1024];
765 int n;
766 int ret = 0;
767
768 if (d[idx].timeout == 0) {
769 add_new_tcp (context, config, d, idx, min_free);
770 return;
771 }
772
773 n = recvfrom(d[idx].s, buf, sizeof(buf), 0, NULL, NULL);
774 if(rk_IS_SOCKET_ERROR(n)){
775 krb5_warn(context, rk_SOCK_ERRNO, "recvfrom failed from %s to %s/%d",
776 d[idx].addr_string, descr_type(d + idx),
777 ntohs(d[idx].port));
778 return;
779 } else if (n == 0) {
780 krb5_warnx(context, "connection closed before end of data after %lu "
781 "bytes from %s to %s/%d", (unsigned long)d[idx].len,
782 d[idx].addr_string, descr_type(d + idx),
783 ntohs(d[idx].port));
784 clear_descr (d + idx);
785 return;
786 }
787 if (grow_descr (context, config, &d[idx], n))
788 return;
789 memcpy(d[idx].buf + d[idx].len, buf, n);
790 d[idx].len += n;
791 if(d[idx].len > 4 && d[idx].buf[0] == 0) {
792 ret = handle_vanilla_tcp (context, config, &d[idx]);
793 } else if(enable_http &&
794 d[idx].len >= 4 &&
795 strncmp((char *)d[idx].buf, "GET ", 4) == 0 &&
796 strncmp((char *)d[idx].buf + d[idx].len - 4,
797 "\r\n\r\n", 4) == 0) {
798
799 /* remove the trailing \r\n\r\n so the string is NUL terminated */
800 d[idx].buf[d[idx].len - 4] = '\0';
801
802 ret = handle_http_tcp (context, config, &d[idx]);
803 if (ret < 0)
804 clear_descr (d + idx);
805 } else if (d[idx].len > 4) {
806 kdc_log (context, config,
807 0, "TCP data of strange type from %s to %s/%d",
808 d[idx].addr_string, descr_type(d + idx),
809 ntohs(d[idx].port));
810 if (d[idx].buf[0] & 0x80) {
811 krb5_data reply;
812
813 kdc_log (context, config, 0, "TCP extension not supported");
814
815 ret = krb5_mk_error(context,
816 KRB5KRB_ERR_FIELD_TOOLONG,
817 NULL,
818 NULL,
819 NULL,
820 NULL,
821 NULL,
822 NULL,
823 &reply);
824 if (ret == 0) {
825 send_reply(context, config, TRUE, d + idx, &reply);
826 krb5_data_free(&reply);
827 }
828 }
829 clear_descr(d + idx);
830 return;
831 }
832 if (ret < 0)
833 return;
834 else if (ret == 1) {
835 do_request(context, config,
836 d[idx].buf, d[idx].len, TRUE, &d[idx]);
837 clear_descr(d + idx);
838 }
839}
840
841krb5_boolean
842realloc_descrs(struct descr **d, unsigned int *ndescr)
843{
844 struct descr *tmp;
845 size_t i;
846
847 tmp = realloc(*d, (*ndescr + 4) * sizeof(**d));
848 if(tmp == NULL)
849 return FALSE;
850
851 *d = tmp;
852 reinit_descrs (*d, *ndescr);
853 memset(*d + *ndescr, 0, 4 * sizeof(**d));
854 for(i = *ndescr; i < *ndescr + 4; i++)
855 init_descr (*d + i);
856
857 *ndescr += 4;
858
859 return TRUE;
860}
861
862int
863next_min_free(krb5_context context, struct descr **d, unsigned int *ndescr)
864{
865 size_t i;
866 int min_free;
867
868 for(i = 0; i < *ndescr; i++) {
869 int s = (*d + i)->s;
870 if(rk_IS_BAD_SOCKET(s))
871 return i;
872 }
873
874 min_free = *ndescr;
875 if(!realloc_descrs(d, ndescr)) {
876 min_free = -1;
877 krb5_warnx(context, "No memory");
878 }
879
880 return min_free;
881}
882
883void
884loop(krb5_context context,
885 krb5_kdc_configuration *config)
886{
887 struct descr *d;
888 unsigned int ndescr;
889
890 ndescr = init_sockets(context, config, &d);
891 if(ndescr <= 0)
892 krb5_errx(context, 1, "No sockets!");
893 kdc_log(context, config, 0, "KDC started");
894 while(exit_flag == 0){
895 struct timeval tmout;
896 fd_set fds;
897 int min_free = -1;
898 int max_fd = 0;
899 size_t i;
900
901 FD_ZERO(&fds);
902 for(i = 0; i < ndescr; i++) {
903 if(!rk_IS_BAD_SOCKET(d[i].s)){
904 if(d[i].type == SOCK_STREAM &&
905 d[i].timeout && d[i].timeout < time(NULL)) {
906 kdc_log(context, config, 1,
907 "TCP-connection from %s expired after %lu bytes",
908 d[i].addr_string, (unsigned long)d[i].len);
909 clear_descr(&d[i]);
910 continue;
911 }
912#ifndef NO_LIMIT_FD_SETSIZE
913 if(max_fd < d[i].s)
914 max_fd = d[i].s;
915#ifdef FD_SETSIZE
916 if (max_fd >= FD_SETSIZE)
917 krb5_errx(context, 1, "fd too large");
918#endif
919#endif
920 FD_SET(d[i].s, &fds);
921 }
922 }
923
924 tmout.tv_sec = TCP_TIMEOUT;
925 tmout.tv_usec = 0;
926 switch(select(max_fd + 1, &fds, 0, 0, &tmout)){
927 case 0:
928 break;
929 case -1:
930 if (errno != EINTR)
931 krb5_warn(context, rk_SOCK_ERRNO, "select");
932 break;
933 default:
934 for(i = 0; i < ndescr; i++)
935 if(!rk_IS_BAD_SOCKET(d[i].s) && FD_ISSET(d[i].s, &fds)) {
936 min_free = next_min_free(context, &d, &ndescr);
937
938 if(d[i].type == SOCK_DGRAM)
939 handle_udp(context, config, &d[i]);
940 else if(d[i].type == SOCK_STREAM)
941 handle_tcp(context, config, d, i, min_free);
942 }
943 }
944 }
945 if (0);
946#ifdef SIGXCPU
947 else if(exit_flag == SIGXCPU)
948 kdc_log(context, config, 0, "CPU time limit exceeded");
949#endif
950 else if(exit_flag == SIGINT || exit_flag == SIGTERM)
951 kdc_log(context, config, 0, "Terminated");
952 else
953 kdc_log(context, config, 0, "Unexpected exit reason: %d", exit_flag);
954 free (d);
955}
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