2 * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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
36 /* Should we enable the HTTP hack? */
39 /* Log over requests to the KDC */
40 const char *request_log;
42 /* A string describing on what ports to listen */
45 krb5_addresses explicit_addresses;
47 size_t max_request_udp;
48 size_t max_request_tcp;
51 * a tuple describing on what to listen
60 /* the current ones */
62 static struct port_desc *ports;
63 static size_t num_ports;
66 * add `family, port, protocol' to the list with duplicate suppresion.
70 add_port(krb5_context context,
71 int family, int port, const char *protocol)
76 if(strcmp(protocol, "udp") == 0)
78 else if(strcmp(protocol, "tcp") == 0)
82 for(i = 0; i < num_ports; i++){
83 if(ports[i].type == type
84 && ports[i].port == port
85 && ports[i].family == family)
88 ports = realloc(ports, (num_ports + 1) * sizeof(*ports));
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;
98 * add a triple but with service -> port lookup
99 * (this prints warnings for stuff that does not exist)
103 add_port_service(krb5_context context,
104 int family, const char *service, int port,
105 const char *protocol)
107 port = krb5_getportbyname (context, service, protocol, port);
108 add_port (context, family, port, protocol);
112 * add the port with service -> port lookup or string -> number
113 * (no warning is printed)
117 add_port_string (krb5_context context,
118 int family, const char *str, const char *protocol)
123 sp = roken_getservbyname (str, protocol);
129 port = htons(strtol(str, &end, 0));
133 add_port (context, family, port, protocol);
137 * add the standard collection of ports for `family'
141 add_standard_ports (krb5_context context,
142 krb5_kdc_configuration *config,
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");
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");
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]
165 parse_ports(krb5_context context,
166 krb5_kdc_configuration *config,
171 char *str_copy = strdup (str);
173 p = strtok_r(str_copy, " \t", &pos);
175 if(strcmp(p, "+") == 0) {
177 add_standard_ports(context, config, AF_INET6);
179 add_standard_ports(context, config, AF_INET);
181 char *q = strchr(p, '/');
185 add_port_string(context, AF_INET6, p, q);
187 add_port_string(context, AF_INET, p, q);
190 add_port_string(context, AF_INET6, p, "udp");
191 add_port_string(context, AF_INET6, p, "tcp");
193 add_port_string(context, AF_INET, p, "udp");
194 add_port_string(context, AF_INET, p, "tcp");
198 p = strtok_r(NULL, " \t", &pos);
204 * every socket we listen on
215 struct sockaddr_storage __ss;
218 char addr_string[128];
222 init_descr(struct descr *d)
224 memset(d, 0, sizeof(*d));
225 d->sa = (struct sockaddr *)&d->__ss;
226 d->s = rk_INVALID_SOCKET;
230 * re-initialize all `n' ->sa in `d'.
234 reinit_descrs (struct descr *d, int n)
238 for (i = 0; i < n; ++i)
239 d[i].sa = (struct sockaddr *)&d[i].__ss;
243 * Create the socket (family, type, port) in `d'
247 init_socket(krb5_context context,
248 krb5_kdc_configuration *config,
249 struct descr *d, krb5_address *a, int family, int type, int port)
252 struct sockaddr_storage __ss;
253 struct sockaddr *sa = (struct sockaddr *)&__ss;
254 krb5_socklen_t sa_size = sizeof(__ss);
258 ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port);
260 krb5_warn(context, ret, "krb5_addr2sockaddr");
261 rk_closesocket(d->s);
262 d->s = rk_INVALID_SOCKET;
266 if (sa->sa_family != family)
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;
275 #if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
278 setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
284 if(rk_IS_SOCKET_ERROR(bind(d->s, sa, sa_size))){
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;
294 if(type == SOCK_STREAM && rk_IS_SOCKET_ERROR(listen(d->s, SOMAXCONN))){
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;
307 * Allocate descriptors for all the sockets that we should listen on
308 * and return the number of them.
312 init_sockets(krb5_context context,
313 krb5_kdc_configuration *config,
320 krb5_addresses addresses;
322 if (explicit_addresses.len) {
323 addresses = explicit_addresses;
325 ret = krb5_get_all_server_addrs (context, &addresses);
327 krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
329 parse_ports(context, config, port_str);
330 d = malloc(addresses.len * num_ports * sizeof(*d));
332 krb5_errx(context, 1, "malloc(%lu) failed",
333 (unsigned long)num_ports * sizeof(*d));
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){
343 krb5_print_address (&addresses.val[j], a_str,
344 sizeof(a_str), &len);
346 kdc_log(context, config, 5, "listening on %s port %u/%s",
348 ntohs(ports[i].port),
349 (ports[i].type == SOCK_STREAM) ? "tcp" : "udp");
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);
370 descr_type(struct descr *d)
372 if (d->type == SOCK_DGRAM)
374 else if (d->type == SOCK_STREAM)
380 addr_to_string(krb5_context context,
381 struct sockaddr *addr, size_t addr_len, char *str, size_t len)
384 if(krb5_sockaddr2address(context, addr, &a) == 0) {
385 if(krb5_print_address(&a, str, len, &len) == 0) {
386 krb5_free_address(context, &a);
389 krb5_free_address(context, &a);
391 snprintf(str, len, "<family=%d>", addr->sa_family);
399 send_reply(krb5_context context,
400 krb5_kdc_configuration *config,
401 krb5_boolean prependlength,
405 kdc_log(context, config, 5,
406 "sending %lu bytes to %s", (unsigned long)reply->length,
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));
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));
429 * Handle the request in `buf, len' to socket `d'
433 do_request(krb5_context context,
434 krb5_kdc_configuration *config,
435 void *buf, size_t len, krb5_boolean prependlength,
440 int datagram_reply = (d->type == SOCK_DGRAM);
442 krb5_kdc_update_time(NULL);
444 krb5_data_zero(&reply);
445 ret = krb5_kdc_process_request(context, config,
446 buf, len, &reply, &prependlength,
447 d->addr_string, d->sa,
450 krb5_kdc_save_request(context, request_log, buf, len, &reply, d->sa);
452 send_reply(context, config, prependlength, d, &reply);
453 krb5_data_free(&reply);
456 kdc_log(context, config, 0,
457 "Failed processing %lu byte request from %s",
458 (unsigned long)len, d->addr_string);
462 * Handle incoming data to the UDP socket in `d'
466 handle_udp(krb5_context context,
467 krb5_kdc_configuration *config,
473 buf = malloc(max_request_udp);
475 kdc_log(context, config, 0, "Failed to allocate %lu bytes", (unsigned long)max_request_udp);
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");
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) {
488 krb5_warn(context, errno,
489 "recvfrom: truncated packet from %s, asking for TCP",
491 krb5_mk_error(context,
492 KRB5KRB_ERR_RESPONSE_TOO_BIG,
500 send_reply(context, config, FALSE, d, &data);
501 krb5_data_free(&data);
503 do_request(context, config, buf, n, FALSE, d);
510 clear_descr(struct descr *d)
513 memset(d->buf, 0, d->size);
515 if(d->s != rk_INVALID_SOCKET)
516 rk_closesocket(d->s);
517 d->s = rk_INVALID_SOCKET;
521 /* remove HTTP %-quoting from buf */
525 unsigned char *p, *q;
526 for(p = q = (unsigned char *)buf; *p; p++, q++) {
527 if(*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
529 if(sscanf((char *)p + 1, "%2x", &x) != 1)
540 #define TCP_TIMEOUT 4
543 * accept a new TCP connection on `d[parent]' and store it in `d[child]'
547 add_new_tcp (krb5_context context,
548 krb5_kdc_configuration *config,
549 struct descr *d, int parent, int child)
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");
564 if (s >= FD_SETSIZE) {
565 krb5_warnx(context, "socket FD too large");
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));
580 * Grow `d' to handle at least `n'.
581 * Return != 0 if fails
585 grow_descr (krb5_context context,
586 krb5_kdc_configuration *config,
587 struct descr *d, size_t n)
589 if (d->size - d->len < n) {
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);
600 tmp = realloc (d->buf, d->size + grow);
602 kdc_log(context, config, 0, "Failed to re-allocate %lu bytes.",
603 (unsigned long)d->size + grow);
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.
619 handle_vanilla_tcp (krb5_context context,
620 krb5_kdc_configuration *config,
626 sp = krb5_storage_from_mem(d->buf, d->len);
628 kdc_log (context, config, 0, "krb5_storage_from_mem failed");
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);
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.
647 handle_http_tcp (krb5_context context,
648 krb5_kdc_configuration *config,
658 /* If its a multi line query, truncate off the first line */
659 p = strstr(s, "\r\n");
664 t = strtok_r(s, " \t", &p);
666 kdc_log(context, config, 0,
667 "Missing HTTP operand (GET) request from %s", d->addr_string);
671 t = strtok_r(NULL, " \t", &p);
673 kdc_log(context, config, 0,
674 "Missing HTTP GET data in request from %s", d->addr_string);
678 data = malloc(strlen(t));
680 kdc_log(context, config, 0, "Failed to allocate %lu bytes",
681 (unsigned long)strlen(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);
692 proto = strtok_r(NULL, " \t", &p);
694 kdc_log(context, config, 0, "Malformed HTTP request from %s", d->addr_string);
698 len = base64_decode(t, data);
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);
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));
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));
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))) {
736 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
737 d->addr_string, strerror(rk_SOCK_ERRNO));
740 if (rk_IS_SOCKET_ERROR(send(d->s, msg, strlen(msg), 0))) {
742 kdc_log(context, config, 0, "HTTP write failed: %s: %s",
743 d->addr_string, strerror(rk_SOCK_ERRNO));
747 if ((size_t)len > d->len)
749 memcpy(d->buf, data, len);
756 * Handle incoming data to the TCP socket in `d[index]'
760 handle_tcp(krb5_context context,
761 krb5_kdc_configuration *config,
762 struct descr *d, int idx, int min_free)
764 unsigned char buf[1024];
768 if (d[idx].timeout == 0) {
769 add_new_tcp (context, config, d, idx, min_free);
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),
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),
784 clear_descr (d + idx);
787 if (grow_descr (context, config, &d[idx], n))
789 memcpy(d[idx].buf + d[idx].len, buf, 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 &&
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) {
799 /* remove the trailing \r\n\r\n so the string is NUL terminated */
800 d[idx].buf[d[idx].len - 4] = '\0';
802 ret = handle_http_tcp (context, config, &d[idx]);
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),
810 if (d[idx].buf[0] & 0x80) {
813 kdc_log (context, config, 0, "TCP extension not supported");
815 ret = krb5_mk_error(context,
816 KRB5KRB_ERR_FIELD_TOOLONG,
825 send_reply(context, config, TRUE, d + idx, &reply);
826 krb5_data_free(&reply);
829 clear_descr(d + idx);
835 do_request(context, config,
836 d[idx].buf, d[idx].len, TRUE, &d[idx]);
837 clear_descr(d + idx);
842 loop(krb5_context context,
843 krb5_kdc_configuration *config)
848 ndescr = init_sockets(context, config, &d);
850 krb5_errx(context, 1, "No sockets!");
851 kdc_log(context, config, 0, "KDC started");
852 while(exit_flag == 0){
853 struct timeval tmout;
860 for(i = 0; i < ndescr; i++) {
861 if(!rk_IS_BAD_SOCKET(d[i].s)){
862 if(d[i].type == SOCK_STREAM &&
863 d[i].timeout && d[i].timeout < time(NULL)) {
864 kdc_log(context, config, 1,
865 "TCP-connection from %s expired after %lu bytes",
866 d[i].addr_string, (unsigned long)d[i].len);
870 #ifndef NO_LIMIT_FD_SETSIZE
874 if (max_fd >= FD_SETSIZE)
875 krb5_errx(context, 1, "fd too large");
878 FD_SET(d[i].s, &fds);
879 } else if(min_free < 0 || i < (size_t)min_free)
884 tmp = realloc(d, (ndescr + 4) * sizeof(*d));
886 krb5_warnx(context, "No memory");
889 reinit_descrs (d, ndescr);
890 memset(d + ndescr, 0, 4 * sizeof(*d));
891 for(i = ndescr; i < ndescr + 4; i++)
898 tmout.tv_sec = TCP_TIMEOUT;
900 switch(select(max_fd + 1, &fds, 0, 0, &tmout)){
905 krb5_warn(context, rk_SOCK_ERRNO, "select");
908 for(i = 0; i < ndescr; i++)
909 if(!rk_IS_BAD_SOCKET(d[i].s) && FD_ISSET(d[i].s, &fds)) {
910 if(d[i].type == SOCK_DGRAM)
911 handle_udp(context, config, &d[i]);
912 else if(d[i].type == SOCK_STREAM)
913 handle_tcp(context, config, d, i, min_free);
919 else if(exit_flag == SIGXCPU)
920 kdc_log(context, config, 0, "CPU time limit exceeded");
922 else if(exit_flag == SIGINT || exit_flag == SIGTERM)
923 kdc_log(context, config, 0, "Terminated");
925 kdc_log(context, config, 0, "Unexpected exit reason: %d", exit_flag);