Pre-2.0 release, MFC firewire disk changes to properly detach SIMs.
[dragonfly.git] / crypto / heimdal-0.6.3 / kdc / connect.c
blob9e9e481235f93edf668ff4f4ef95b91b80956f6e
1 /*
2 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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.
34 #include "kdc_locl.h"
36 RCSID("$Id: connect.c,v 1.90.2.2 2004/04/02 20:50:53 lha Exp $");
39 * a tuple describing on what to listen
42 struct port_desc{
43 int family;
44 int type;
45 int port;
48 /* the current ones */
50 static struct port_desc *ports;
51 static int num_ports;
54 * add `family, port, protocol' to the list with duplicate suppresion.
57 static void
58 add_port(int family, int port, const char *protocol)
60 int type;
61 int i;
63 if(strcmp(protocol, "udp") == 0)
64 type = SOCK_DGRAM;
65 else if(strcmp(protocol, "tcp") == 0)
66 type = SOCK_STREAM;
67 else
68 return;
69 for(i = 0; i < num_ports; i++){
70 if(ports[i].type == type
71 && ports[i].port == port
72 && ports[i].family == family)
73 return;
75 ports = realloc(ports, (num_ports + 1) * sizeof(*ports));
76 if (ports == NULL)
77 krb5_err (context, 1, errno, "realloc");
78 ports[num_ports].family = family;
79 ports[num_ports].type = type;
80 ports[num_ports].port = port;
81 num_ports++;
85 * add a triple but with service -> port lookup
86 * (this prints warnings for stuff that does not exist)
89 static void
90 add_port_service(int family, const char *service, int port,
91 const char *protocol)
93 port = krb5_getportbyname (context, service, protocol, port);
94 add_port (family, port, protocol);
98 * add the port with service -> port lookup or string -> number
99 * (no warning is printed)
102 static void
103 add_port_string (int family, const char *port_str, const char *protocol)
105 struct servent *sp;
106 int port;
108 sp = roken_getservbyname (port_str, protocol);
109 if (sp != NULL) {
110 port = sp->s_port;
111 } else {
112 char *end;
114 port = htons(strtol(port_str, &end, 0));
115 if (end == port_str)
116 return;
118 add_port (family, port, protocol);
122 * add the standard collection of ports for `family'
125 static void
126 add_standard_ports (int family)
128 add_port_service(family, "kerberos", 88, "udp");
129 add_port_service(family, "kerberos", 88, "tcp");
130 add_port_service(family, "kerberos-sec", 88, "udp");
131 add_port_service(family, "kerberos-sec", 88, "tcp");
132 if(enable_http)
133 add_port_service(family, "http", 80, "tcp");
134 if(enable_524) {
135 add_port_service(family, "krb524", 4444, "udp");
136 add_port_service(family, "krb524", 4444, "tcp");
138 #ifdef KRB4
139 if(enable_v4) {
140 add_port_service(family, "kerberos-iv", 750, "udp");
141 add_port_service(family, "kerberos-iv", 750, "tcp");
143 if (enable_kaserver)
144 add_port_service(family, "afs3-kaserver", 7004, "udp");
145 #endif
149 * parse the set of space-delimited ports in `str' and add them.
150 * "+" => all the standard ones
151 * otherwise it's port|service[/protocol]
154 static void
155 parse_ports(const char *str)
157 char *pos = NULL;
158 char *p;
159 char *str_copy = strdup (str);
161 p = strtok_r(str_copy, " \t", &pos);
162 while(p != NULL) {
163 if(strcmp(p, "+") == 0) {
164 #ifdef HAVE_IPV6
165 add_standard_ports(AF_INET6);
166 #endif
167 add_standard_ports(AF_INET);
168 } else {
169 char *q = strchr(p, '/');
170 if(q){
171 *q++ = 0;
172 #ifdef HAVE_IPV6
173 add_port_string(AF_INET6, p, q);
174 #endif
175 add_port_string(AF_INET, p, q);
176 }else {
177 #ifdef HAVE_IPV6
178 add_port_string(AF_INET6, p, "udp");
179 add_port_string(AF_INET6, p, "tcp");
180 #endif
181 add_port_string(AF_INET, p, "udp");
182 add_port_string(AF_INET, p, "tcp");
186 p = strtok_r(NULL, " \t", &pos);
188 free (str_copy);
192 * every socket we listen on
195 struct descr {
196 int s;
197 int type;
198 unsigned char *buf;
199 size_t size;
200 size_t len;
201 time_t timeout;
202 struct sockaddr_storage __ss;
203 struct sockaddr *sa;
204 socklen_t sock_len;
205 char addr_string[128];
208 static void
209 init_descr(struct descr *d)
211 memset(d, 0, sizeof(*d));
212 d->sa = (struct sockaddr *)&d->__ss;
213 d->s = -1;
217 * re-initialize all `n' ->sa in `d'.
220 static void
221 reinit_descrs (struct descr *d, int n)
223 int i;
225 for (i = 0; i < n; ++i)
226 d[i].sa = (struct sockaddr *)&d[i].__ss;
230 * Create the socket (family, type, port) in `d'
233 static void
234 init_socket(struct descr *d, krb5_address *a, int family, int type, int port)
236 krb5_error_code ret;
237 struct sockaddr_storage __ss;
238 struct sockaddr *sa = (struct sockaddr *)&__ss;
239 int sa_size = sizeof(__ss);
241 init_descr (d);
243 ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port);
244 if (ret) {
245 krb5_warn(context, ret, "krb5_addr2sockaddr");
246 close(d->s);
247 d->s = -1;
248 return;
251 if (sa->sa_family != family)
252 return;
254 d->s = socket(family, type, 0);
255 if(d->s < 0){
256 krb5_warn(context, errno, "socket(%d, %d, 0)", family, type);
257 d->s = -1;
258 return;
260 #if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
262 int one = 1;
263 setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
265 #endif
266 d->type = type;
268 if(bind(d->s, sa, sa_size) < 0){
269 char a_str[256];
270 size_t len;
272 krb5_print_address (a, a_str, sizeof(a_str), &len);
273 krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port));
274 close(d->s);
275 d->s = -1;
276 return;
278 if(type == SOCK_STREAM && listen(d->s, SOMAXCONN) < 0){
279 char a_str[256];
280 size_t len;
282 krb5_print_address (a, a_str, sizeof(a_str), &len);
283 krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port));
284 close(d->s);
285 d->s = -1;
286 return;
291 * Allocate descriptors for all the sockets that we should listen on
292 * and return the number of them.
295 static int
296 init_sockets(struct descr **desc)
298 krb5_error_code ret;
299 int i, j;
300 struct descr *d;
301 int num = 0;
302 krb5_addresses addresses;
304 if (explicit_addresses.len) {
305 addresses = explicit_addresses;
306 } else {
307 ret = krb5_get_all_server_addrs (context, &addresses);
308 if (ret)
309 krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
311 parse_ports(port_str);
312 d = malloc(addresses.len * num_ports * sizeof(*d));
313 if (d == NULL)
314 krb5_errx(context, 1, "malloc(%lu) failed",
315 (unsigned long)num_ports * sizeof(*d));
317 for (i = 0; i < num_ports; i++){
318 for (j = 0; j < addresses.len; ++j) {
319 init_socket(&d[num], &addresses.val[j],
320 ports[i].family, ports[i].type, ports[i].port);
321 if(d[num].s != -1){
322 char a_str[80];
323 size_t len;
325 krb5_print_address (&addresses.val[j], a_str,
326 sizeof(a_str), &len);
328 kdc_log(5, "listening on %s port %u/%s",
329 a_str,
330 ntohs(ports[i].port),
331 (ports[i].type == SOCK_STREAM) ? "tcp" : "udp");
332 /* XXX */
333 num++;
337 krb5_free_addresses (context, &addresses);
338 d = realloc(d, num * sizeof(*d));
339 if (d == NULL && num != 0)
340 krb5_errx(context, 1, "realloc(%lu) failed",
341 (unsigned long)num * sizeof(*d));
342 reinit_descrs (d, num);
343 *desc = d;
344 return num;
348 * handle the request in `buf, len', from `addr' (or `from' as a string),
349 * sending a reply in `reply'.
352 static int
353 process_request(unsigned char *buf,
354 size_t len,
355 krb5_data *reply,
356 int *sendlength,
357 const char *from,
358 struct sockaddr *addr)
360 KDC_REQ req;
361 Ticket ticket;
362 krb5_error_code ret;
363 size_t i;
365 gettimeofday(&now, NULL);
366 if(decode_AS_REQ(buf, len, &req, &i) == 0){
367 ret = as_rep(&req, reply, from, addr);
368 free_AS_REQ(&req);
369 return ret;
370 }else if(decode_TGS_REQ(buf, len, &req, &i) == 0){
371 ret = tgs_rep(&req, reply, from, addr);
372 free_TGS_REQ(&req);
373 return ret;
374 }else if(decode_Ticket(buf, len, &ticket, &i) == 0){
375 ret = do_524(&ticket, reply, from, addr);
376 free_Ticket(&ticket);
377 return ret;
378 #ifdef KRB4
379 } else if(maybe_version4(buf, len)){
380 *sendlength = 0; /* elbitapmoc sdrawkcab XXX */
381 do_version4(buf, len, reply, from, (struct sockaddr_in*)addr);
382 return 0;
383 } else if (enable_kaserver) {
384 ret = do_kaserver (buf, len, reply, from, (struct sockaddr_in*)addr);
385 return ret;
386 #endif
389 return -1;
392 static void
393 addr_to_string(struct sockaddr *addr, size_t addr_len, char *str, size_t len)
395 krb5_address a;
396 if(krb5_sockaddr2address(context, addr, &a) == 0) {
397 if(krb5_print_address(&a, str, len, &len) == 0) {
398 krb5_free_address(context, &a);
399 return;
401 krb5_free_address(context, &a);
403 snprintf(str, len, "<family=%d>", addr->sa_family);
407 * Handle the request in `buf, len' to socket `d'
410 static void
411 do_request(void *buf, size_t len, int sendlength,
412 struct descr *d)
414 krb5_error_code ret;
415 krb5_data reply;
417 reply.length = 0;
418 ret = process_request(buf, len, &reply, &sendlength,
419 d->addr_string, d->sa);
420 if(reply.length){
421 kdc_log(5, "sending %lu bytes to %s", (unsigned long)reply.length,
422 d->addr_string);
423 if(sendlength){
424 unsigned char len[4];
425 len[0] = (reply.length >> 24) & 0xff;
426 len[1] = (reply.length >> 16) & 0xff;
427 len[2] = (reply.length >> 8) & 0xff;
428 len[3] = reply.length & 0xff;
429 if(sendto(d->s, len, sizeof(len), 0, d->sa, d->sock_len) < 0) {
430 kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno));
431 krb5_data_free(&reply);
432 return;
435 if(sendto(d->s, reply.data, reply.length, 0, d->sa, d->sock_len) < 0) {
436 kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno));
437 krb5_data_free(&reply);
438 return;
440 krb5_data_free(&reply);
442 if(ret)
443 kdc_log(0, "Failed processing %lu byte request from %s",
444 (unsigned long)len, d->addr_string);
448 * Handle incoming data to the UDP socket in `d'
451 static void
452 handle_udp(struct descr *d)
454 unsigned char *buf;
455 int n;
457 buf = malloc(max_request);
458 if(buf == NULL){
459 kdc_log(0, "Failed to allocate %lu bytes", (unsigned long)max_request);
460 return;
463 d->sock_len = sizeof(d->__ss);
464 n = recvfrom(d->s, buf, max_request, 0, d->sa, &d->sock_len);
465 if(n < 0)
466 krb5_warn(context, errno, "recvfrom");
467 else {
468 addr_to_string (d->sa, d->sock_len,
469 d->addr_string, sizeof(d->addr_string));
470 do_request(buf, n, 0, d);
472 free (buf);
475 static void
476 clear_descr(struct descr *d)
478 if(d->buf)
479 memset(d->buf, 0, d->size);
480 d->len = 0;
481 if(d->s != -1)
482 close(d->s);
483 d->s = -1;
487 /* remove HTTP %-quoting from buf */
488 static int
489 de_http(char *buf)
491 char *p, *q;
492 for(p = q = buf; *p; p++, q++) {
493 if(*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
494 unsigned int x;
495 if(sscanf(p + 1, "%2x", &x) != 1)
496 return -1;
497 *q = x;
498 p += 2;
499 } else
500 *q = *p;
502 *q = '\0';
503 return 0;
506 #define TCP_TIMEOUT 4
509 * accept a new TCP connection on `d[parent]' and store it in `d[child]'
512 static void
513 add_new_tcp (struct descr *d, int parent, int child)
515 int s;
517 if (child == -1)
518 return;
520 d[child].sock_len = sizeof(d[child].__ss);
521 s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
522 if(s < 0) {
523 krb5_warn(context, errno, "accept");
524 return;
527 if (s >= FD_SETSIZE) {
528 krb5_warnx(context, "socket FD too large");
529 close (s);
530 return;
533 d[child].s = s;
534 d[child].timeout = time(NULL) + TCP_TIMEOUT;
535 d[child].type = SOCK_STREAM;
536 addr_to_string (d[child].sa, d[child].sock_len,
537 d[child].addr_string, sizeof(d[child].addr_string));
541 * Grow `d' to handle at least `n'.
542 * Return != 0 if fails
545 static int
546 grow_descr (struct descr *d, size_t n)
548 if (d->size - d->len < n) {
549 unsigned char *tmp;
550 size_t grow;
552 grow = max(1024, d->len + n);
553 if (d->size + grow > max_request) {
554 kdc_log(0, "Request exceeds max request size (%lu bytes).",
555 (unsigned long)d->size + grow);
556 clear_descr(d);
557 return -1;
559 tmp = realloc (d->buf, d->size + grow);
560 if (tmp == NULL) {
561 kdc_log(0, "Failed to re-allocate %lu bytes.",
562 (unsigned long)d->size + grow);
563 clear_descr(d);
564 return -1;
566 d->size += grow;
567 d->buf = tmp;
569 return 0;
573 * Try to handle the TCP data at `d->buf, d->len'.
574 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
577 static int
578 handle_vanilla_tcp (struct descr *d)
580 krb5_storage *sp;
581 int32_t len;
583 sp = krb5_storage_from_mem(d->buf, d->len);
584 if (sp == NULL) {
585 kdc_log (0, "krb5_storage_from_mem failed");
586 return -1;
588 krb5_ret_int32(sp, &len);
589 krb5_storage_free(sp);
590 if(d->len - 4 >= len) {
591 memmove(d->buf, d->buf + 4, d->len - 4);
592 return 1;
594 return 0;
598 * Try to handle the TCP/HTTP data at `d->buf, d->len'.
599 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
602 static int
603 handle_http_tcp (struct descr *d)
605 char *s, *p, *t;
606 void *data;
607 char *proto;
608 int len;
610 s = (char *)d->buf;
612 p = strstr(s, "\r\n");
613 if (p == NULL) {
614 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
615 return -1;
617 *p = 0;
619 p = NULL;
620 t = strtok_r(s, " \t", &p);
621 if (t == NULL) {
622 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
623 return -1;
625 t = strtok_r(NULL, " \t", &p);
626 if(t == NULL) {
627 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
628 return -1;
630 data = malloc(strlen(t));
631 if (data == NULL) {
632 kdc_log(0, "Failed to allocate %lu bytes",
633 (unsigned long)strlen(t));
634 return -1;
636 if(*t == '/')
637 t++;
638 if(de_http(t) != 0) {
639 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
640 kdc_log(5, "Request: %s", t);
641 free(data);
642 return -1;
644 proto = strtok_r(NULL, " \t", &p);
645 if (proto == NULL) {
646 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
647 free(data);
648 return -1;
650 len = base64_decode(t, data);
651 if(len <= 0){
652 const char *msg =
653 " 404 Not found\r\n"
654 "Server: Heimdal/" VERSION "\r\n"
655 "Cache-Control: no-cache\r\n"
656 "Pragma: no-cache\r\n"
657 "Content-type: text/html\r\n"
658 "Content-transfer-encoding: 8bit\r\n\r\n"
659 "<TITLE>404 Not found</TITLE>\r\n"
660 "<H1>404 Not found</H1>\r\n"
661 "That page doesn't exist, maybe you are looking for "
662 "<A HREF=\"http://www.pdc.kth.se/heimdal/\">Heimdal</A>?\r\n";
663 write(d->s, proto, strlen(proto));
664 write(d->s, msg, strlen(msg));
665 kdc_log(0, "HTTP request from %s is non KDC request", d->addr_string);
666 kdc_log(5, "Request: %s", t);
667 free(data);
668 return -1;
671 const char *msg =
672 " 200 OK\r\n"
673 "Server: Heimdal/" VERSION "\r\n"
674 "Cache-Control: no-cache\r\n"
675 "Pragma: no-cache\r\n"
676 "Content-type: application/octet-stream\r\n"
677 "Content-transfer-encoding: binary\r\n\r\n";
678 write(d->s, proto, strlen(proto));
679 write(d->s, msg, strlen(msg));
681 memcpy(d->buf, data, len);
682 d->len = len;
683 free(data);
684 return 1;
688 * Handle incoming data to the TCP socket in `d[index]'
691 static void
692 handle_tcp(struct descr *d, int index, int min_free)
694 unsigned char buf[1024];
695 int n;
696 int ret = 0;
698 if (d[index].timeout == 0) {
699 add_new_tcp (d, index, min_free);
700 return;
703 n = recvfrom(d[index].s, buf, sizeof(buf), 0, NULL, NULL);
704 if(n < 0){
705 krb5_warn(context, errno, "recvfrom");
706 return;
707 } else if (n == 0) {
708 krb5_warnx(context, "connection closed before end of data after %lu "
709 "bytes from %s",
710 (unsigned long)d[index].len, d[index].addr_string);
711 clear_descr (d + index);
712 return;
714 if (grow_descr (&d[index], n))
715 return;
716 memcpy(d[index].buf + d[index].len, buf, n);
717 d[index].len += n;
718 if(d[index].len > 4 && d[index].buf[0] == 0) {
719 ret = handle_vanilla_tcp (&d[index]);
720 } else if(enable_http &&
721 d[index].len >= 4 &&
722 strncmp((char *)d[index].buf, "GET ", 4) == 0 &&
723 strncmp((char *)d[index].buf + d[index].len - 4,
724 "\r\n\r\n", 4) == 0) {
725 ret = handle_http_tcp (&d[index]);
726 if (ret < 0)
727 clear_descr (d + index);
728 } else if (d[index].len > 4) {
729 kdc_log (0, "TCP data of strange type from %s", d[index].addr_string);
730 return;
732 if (ret < 0)
733 return;
734 else if (ret == 1) {
735 do_request(d[index].buf, d[index].len, 1, &d[index]);
736 clear_descr(d + index);
740 void
741 loop(void)
743 struct descr *d;
744 int ndescr;
746 ndescr = init_sockets(&d);
747 if(ndescr <= 0)
748 krb5_errx(context, 1, "No sockets!");
749 while(exit_flag == 0){
750 struct timeval tmout;
751 fd_set fds;
752 int min_free = -1;
753 int max_fd = 0;
754 int i;
756 FD_ZERO(&fds);
757 for(i = 0; i < ndescr; i++) {
758 if(d[i].s >= 0){
759 if(d[i].type == SOCK_STREAM &&
760 d[i].timeout && d[i].timeout < time(NULL)) {
761 kdc_log(1, "TCP-connection from %s expired after %lu bytes",
762 d[i].addr_string, (unsigned long)d[i].len);
763 clear_descr(&d[i]);
764 continue;
766 if(max_fd < d[i].s)
767 max_fd = d[i].s;
768 if (max_fd >= FD_SETSIZE)
769 krb5_errx(context, 1, "fd too large");
770 FD_SET(d[i].s, &fds);
771 } else if(min_free < 0 || i < min_free)
772 min_free = i;
774 if(min_free == -1){
775 struct descr *tmp;
776 tmp = realloc(d, (ndescr + 4) * sizeof(*d));
777 if(tmp == NULL)
778 krb5_warnx(context, "No memory");
779 else {
780 d = tmp;
781 reinit_descrs (d, ndescr);
782 memset(d + ndescr, 0, 4 * sizeof(*d));
783 for(i = ndescr; i < ndescr + 4; i++)
784 init_descr (&d[i]);
785 min_free = ndescr;
786 ndescr += 4;
790 tmout.tv_sec = TCP_TIMEOUT;
791 tmout.tv_usec = 0;
792 switch(select(max_fd + 1, &fds, 0, 0, &tmout)){
793 case 0:
794 break;
795 case -1:
796 if (errno != EINTR)
797 krb5_warn(context, errno, "select");
798 break;
799 default:
800 for(i = 0; i < ndescr; i++)
801 if(d[i].s >= 0 && FD_ISSET(d[i].s, &fds)) {
802 if(d[i].type == SOCK_DGRAM)
803 handle_udp(&d[i]);
804 else if(d[i].type == SOCK_STREAM)
805 handle_tcp(d, i, min_free);
809 free (d);