37
38/*
39 * a tuple describing on what to listen
40 */
41
42struct port_desc{
43 int family;
44 int type;
45 int port;
46};
47
48/* the current ones */
49
50static struct port_desc *ports;
51static int num_ports;
52
53/*
54 * add `family, port, protocol' to the list with duplicate suppresion.
55 */
56
57static void
58add_port(int family, int port, const char *protocol)
59{
60 int type;
61 int i;
62
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;
74 }
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++;
82}
83
84/*
85 * add a triple but with service -> port lookup
86 * (this prints warnings for stuff that does not exist)
87 */
88
89static void
90add_port_service(int family, const char *service, int port,
91 const char *protocol)
92{
93 port = krb5_getportbyname (context, service, protocol, port);
94 add_port (family, port, protocol);
95}
96
97/*
98 * add the port with service -> port lookup or string -> number
99 * (no warning is printed)
100 */
101
102static void
103add_port_string (int family, const char *port_str, const char *protocol)
104{
105 struct servent *sp;
106 int port;
107
108 sp = roken_getservbyname (port_str, protocol);
109 if (sp != NULL) {
110 port = sp->s_port;
111 } else {
112 char *end;
113
114 port = htons(strtol(port_str, &end, 0));
115 if (end == port_str)
116 return;
117 }
118 add_port (family, port, protocol);
119}
120
121/*
122 * add the standard collection of ports for `family'
123 */
124
125static void
126add_standard_ports (int family)
127{
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");
137 }
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");
142 }
143 if (enable_kaserver)
144 add_port_service(family, "afs3-kaserver", 7004, "udp");
145#endif
146}
147
148/*
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]
152 */
153
154static void
155parse_ports(const char *str)
156{
157 char *pos = NULL;
158 char *p;
159 char *str_copy = strdup (str);
160
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");
183 }
184 }
185
186 p = strtok_r(NULL, " \t", &pos);
187 }
188 free (str_copy);
189}
190
191/*
192 * every socket we listen on
193 */
194
195struct 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];
206};
207
208static void
209init_descr(struct descr *d)
210{
211 memset(d, 0, sizeof(*d));
212 d->sa = (struct sockaddr *)&d->__ss;
213 d->s = -1;
214}
215
216/*
217 * re-initialize all `n' ->sa in `d'.
218 */
219
220static void
221reinit_descrs (struct descr *d, int n)
222{
223 int i;
224
225 for (i = 0; i < n; ++i)
226 d[i].sa = (struct sockaddr *)&d[i].__ss;
227}
228
229/*
230 * Create the socket (family, type, port) in `d'
231 */
232
233static void
234init_socket(struct descr *d, krb5_address *a, int family, int type, int port)
235{
236 krb5_error_code ret;
237 struct sockaddr_storage __ss;
238 struct sockaddr *sa = (struct sockaddr *)&__ss;
239 int sa_size = sizeof(__ss);
240
241 init_descr (d);
242
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;
249 }
250
251 if (sa->sa_family != family)
252 return;
253
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;
259 }
260#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
261 {
262 int one = 1;
263 setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
264 }
265#endif
266 d->type = type;
267
268 if(bind(d->s, sa, sa_size) < 0){
269 char a_str[256];
270 size_t len;
271
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;
277 }
278 if(type == SOCK_STREAM && listen(d->s, SOMAXCONN) < 0){
279 char a_str[256];
280 size_t len;
281
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;
287 }
288}
289
290/*
291 * Allocate descriptors for all the sockets that we should listen on
292 * and return the number of them.
293 */
294
295static int
296init_sockets(struct descr **desc)
297{
298 krb5_error_code ret;
299 int i, j;
300 struct descr *d;
301 int num = 0;
302 krb5_addresses addresses;
303
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");
310 }
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));
316
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;
324
325 krb5_print_address (&addresses.val[j], a_str,
326 sizeof(a_str), &len);
327
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++;
334 }
335 }
336 }
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;
345}
346
347/*
348 * handle the request in `buf, len', from `addr' (or `from' as a string),
349 * sending a reply in `reply'.
350 */
351
352static int
353process_request(unsigned char *buf,
354 size_t len,
355 krb5_data *reply,
356 int *sendlength,
357 const char *from,
358 struct sockaddr *addr)
359{
360 KDC_REQ req;
361 Ticket ticket;
362 krb5_error_code ret;
363 size_t i;
364
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
387 }
388
389 return -1;
390}
391
392static void
393addr_to_string(struct sockaddr *addr, size_t addr_len, char *str, size_t len)
394{
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;
400 }
401 krb5_free_address(context, &a);
402 }
403 snprintf(str, len, "<family=%d>", addr->sa_family);
404}
405
406/*
407 * Handle the request in `buf, len' to socket `d'
408 */
409
410static void
411do_request(void *buf, size_t len, int sendlength,
412 struct descr *d)
413{
414 krb5_error_code ret;
415 krb5_data reply;
416
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;
433 }
434 }
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;
439 }
440 krb5_data_free(&reply);
441 }
442 if(ret)
443 kdc_log(0, "Failed processing %lu byte request from %s",
444 (unsigned long)len, d->addr_string);
445}
446
447/*
448 * Handle incoming data to the UDP socket in `d'
449 */
450
451static void
452handle_udp(struct descr *d)
453{
454 unsigned char *buf;
455 int n;
456
457 buf = malloc(max_request);
458 if(buf == NULL){
459 kdc_log(0, "Failed to allocate %lu bytes", (unsigned long)max_request);
460 return;
461 }
462
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);
471 }
472 free (buf);
473}
474
475static void
476clear_descr(struct descr *d)
477{
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;
484}
485
486
487/* remove HTTP %-quoting from buf */
488static int
489de_http(char *buf)
490{
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;
501 }
502 *q = '\0';
503 return 0;
504}
505
506#define TCP_TIMEOUT 4
507
508/*
509 * accept a new TCP connection on `d[parent]' and store it in `d[child]'
510 */
511
512static void
513add_new_tcp (struct descr *d, int parent, int child)
514{
515 int s;
516
517 if (child == -1)
518 return;
519
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;
525 }
526
527 if (s >= FD_SETSIZE) {
528 krb5_warnx(context, "socket FD too large");
529 close (s);
530 return;
531 }
532
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));
538}
539
540/*
541 * Grow `d' to handle at least `n'.
542 * Return != 0 if fails
543 */
544
545static int
546grow_descr (struct descr *d, size_t n)
547{
548 if (d->size - d->len < n) {
549 unsigned char *tmp;
550 size_t grow;
551
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;
558 }
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;
565 }
566 d->size += grow;
567 d->buf = tmp;
568 }
569 return 0;
570}
571
572/*
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.
575 */
576
577static int
578handle_vanilla_tcp (struct descr *d)
579{
580 krb5_storage *sp;
581 int32_t len;
582
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;
587 }
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;
593 }
594 return 0;
595}
596
597/*
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.
600 */
601
602static int
603handle_http_tcp (struct descr *d)
604{
605 char *s, *p, *t;
606 void *data;
607 char *proto;
608 int len;
609
610 s = (char *)d->buf;
611
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;
616 }
617 *p = 0;
618
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;
624 }
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;
629 }
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;
635 }
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;
643 }
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;
649 }
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;
669 }
670 {
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));
680 }
681 memcpy(d->buf, data, len);
682 d->len = len;
683 free(data);
684 return 1;
685}
686
687/*
688 * Handle incoming data to the TCP socket in `d[index]'
689 */
690
691static void
692handle_tcp(struct descr *d, int index, int min_free)
693{
694 unsigned char buf[1024];
695 int n;
696 int ret = 0;
697
698 if (d[index].timeout == 0) {
699 add_new_tcp (d, index, min_free);
700 return;
701 }
702
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) {
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