2 * Copyright (c) 1997-2002 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 RCSID("$Id: connect.c,v 1.86.4.1 2002/10/21 16:05:17 joda Exp $");
39 * a tuple describing on what to listen
48 /* the current ones */
50 static struct port_desc *ports;
54 * add `family, port, protocol' to the list with duplicate suppresion.
58 add_port(int family, int port, const char *protocol)
63 if(strcmp(protocol, "udp") == 0)
65 else if(strcmp(protocol, "tcp") == 0)
69 for(i = 0; i < num_ports; i++){
70 if(ports[i].type == type
71 && ports[i].port == port
72 && ports[i].family == family)
75 ports = realloc(ports, (num_ports + 1) * sizeof(*ports));
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;
85 * add a triple but with service -> port lookup
86 * (this prints warnings for stuff that does not exist)
90 add_port_service(int family, const char *service, int port,
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)
103 add_port_string (int family, const char *port_str, const char *protocol)
108 sp = roken_getservbyname (port_str, protocol);
114 port = htons(strtol(port_str, &end, 0));
118 add_port (family, port, protocol);
122 * add the standard collection of ports for `family'
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");
133 add_port_service(family, "http", 80, "tcp");
136 add_port_service(family, "kerberos-iv", 750, "udp");
137 add_port_service(family, "kerberos-iv", 750, "tcp");
140 add_port_service(family, "krb524", 4444, "udp");
141 add_port_service(family, "krb524", 4444, "tcp");
144 add_port_service(family, "afs3-kaserver", 7004, "udp");
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]
155 parse_ports(const char *str)
159 char *str_copy = strdup (str);
161 p = strtok_r(str_copy, " \t", &pos);
163 if(strcmp(p, "+") == 0) {
165 add_standard_ports(AF_INET6);
167 add_standard_ports(AF_INET);
169 char *q = strchr(p, '/');
173 add_port_string(AF_INET6, p, q);
175 add_port_string(AF_INET, p, q);
178 add_port_string(AF_INET6, p, "udp");
179 add_port_string(AF_INET6, p, "tcp");
181 add_port_string(AF_INET, p, "udp");
182 add_port_string(AF_INET, p, "tcp");
186 p = strtok_r(NULL, " \t", &pos);
192 * every socket we listen on
202 struct sockaddr_storage __ss;
205 char addr_string[128];
209 init_descr(struct descr *d)
211 memset(d, 0, sizeof(*d));
212 d->sa = (struct sockaddr *)&d->__ss;
217 * re-intialize all `n' ->sa in `d'.
221 reinit_descrs (struct descr *d, int n)
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'
234 init_socket(struct descr *d, krb5_address *a, int family, int type, int port)
237 struct sockaddr_storage __ss;
238 struct sockaddr *sa = (struct sockaddr *)&__ss;
243 ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port);
245 krb5_warn(context, ret, "krb5_addr2sockaddr");
251 if (sa->sa_family != family)
254 d->s = socket(family, type, 0);
256 krb5_warn(context, errno, "socket(%d, %d, 0)", family, type);
260 #if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
263 setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
268 if(bind(d->s, sa, sa_size) < 0){
272 krb5_print_address (a, a_str, sizeof(a_str), &len);
273 krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port));
278 if(type == SOCK_STREAM && listen(d->s, SOMAXCONN) < 0){
282 krb5_print_address (a, a_str, sizeof(a_str), &len);
283 krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port));
291 * Allocate descriptors for all the sockets that we should listen on
292 * and return the number of them.
296 init_sockets(struct descr **desc)
302 krb5_addresses addresses;
304 if (explicit_addresses.len) {
305 addresses = explicit_addresses;
307 ret = krb5_get_all_server_addrs (context, &addresses);
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));
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);
325 krb5_print_address (&addresses.val[j], a_str,
326 sizeof(a_str), &len);
328 kdc_log(5, "listening on %s port %u/%s",
330 ntohs(ports[i].port),
331 (ports[i].type == SOCK_STREAM) ? "tcp" : "udp");
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);
348 * handle the request in `buf, len', from `addr' (or `from' as a string),
349 * sending a reply in `reply'.
353 process_request(unsigned char *buf,
358 struct sockaddr *addr)
367 gettimeofday(&now, NULL);
368 if(decode_AS_REQ(buf, len, &req, &i) == 0){
369 ret = as_rep(&req, reply, from, addr);
372 }else if(decode_TGS_REQ(buf, len, &req, &i) == 0){
373 ret = tgs_rep(&req, reply, from, addr);
378 else if(maybe_version4(buf, len)){
379 *sendlength = 0; /* elbitapmoc sdrawkcab XXX */
380 do_version4(buf, len, reply, from, (struct sockaddr_in*)addr);
382 }else if(decode_Ticket(buf, len, &ticket, &i) == 0){
383 ret = do_524(&ticket, reply, from, addr);
384 free_Ticket(&ticket);
386 } else if (enable_kaserver) {
387 ret = do_kaserver (buf, len, reply, from, (struct sockaddr_in*)addr);
396 addr_to_string(struct sockaddr *addr, size_t addr_len, char *str, size_t len)
399 if(krb5_sockaddr2address(context, addr, &a) == 0) {
400 if(krb5_print_address(&a, str, len, &len) == 0) {
401 krb5_free_address(context, &a);
404 krb5_free_address(context, &a);
406 snprintf(str, len, "<family=%d>", addr->sa_family);
410 * Handle the request in `buf, len' to socket `d'
414 do_request(void *buf, size_t len, int sendlength,
421 ret = process_request(buf, len, &reply, &sendlength,
422 d->addr_string, d->sa);
424 kdc_log(5, "sending %lu bytes to %s", (unsigned long)reply.length,
427 unsigned char len[4];
428 len[0] = (reply.length >> 24) & 0xff;
429 len[1] = (reply.length >> 16) & 0xff;
430 len[2] = (reply.length >> 8) & 0xff;
431 len[3] = reply.length & 0xff;
432 if(sendto(d->s, len, sizeof(len), 0, d->sa, d->sock_len) < 0) {
433 kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno));
434 krb5_data_free(&reply);
438 if(sendto(d->s, reply.data, reply.length, 0, d->sa, d->sock_len) < 0) {
439 kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno));
440 krb5_data_free(&reply);
443 krb5_data_free(&reply);
446 kdc_log(0, "Failed processing %lu byte request from %s",
447 (unsigned long)len, d->addr_string);
451 * Handle incoming data to the UDP socket in `d'
455 handle_udp(struct descr *d)
460 buf = malloc(max_request);
462 kdc_log(0, "Failed to allocate %lu bytes", (unsigned long)max_request);
466 d->sock_len = sizeof(d->__ss);
467 n = recvfrom(d->s, buf, max_request, 0, d->sa, &d->sock_len);
469 krb5_warn(context, errno, "recvfrom");
471 addr_to_string (d->sa, d->sock_len,
472 d->addr_string, sizeof(d->addr_string));
473 do_request(buf, n, 0, d);
479 clear_descr(struct descr *d)
482 memset(d->buf, 0, d->size);
490 /* remove HTTP %-quoting from buf */
495 for(p = q = buf; *p; p++, q++) {
496 if(*p == '%' && isxdigit(p[1]) && isxdigit(p[2])) {
498 if(sscanf(p + 1, "%2x", &x) != 1)
509 #define TCP_TIMEOUT 4
512 * accept a new TCP connection on `d[parent]' and store it in `d[child]'
516 add_new_tcp (struct descr *d, int parent, int child)
523 d[child].sock_len = sizeof(d[child].__ss);
524 s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
526 krb5_warn(context, errno, "accept");
530 if (s >= FD_SETSIZE) {
531 krb5_warnx(context, "socket FD too large");
537 d[child].timeout = time(NULL) + TCP_TIMEOUT;
538 d[child].type = SOCK_STREAM;
539 addr_to_string (d[child].sa, d[child].sock_len,
540 d[child].addr_string, sizeof(d[child].addr_string));
544 * Grow `d' to handle at least `n'.
545 * Return != 0 if fails
549 grow_descr (struct descr *d, size_t n)
551 if (d->size - d->len < n) {
554 d->size += max(1024, d->len + n);
555 if (d->size >= max_request) {
556 kdc_log(0, "Request exceeds max request size (%lu bytes).",
557 (unsigned long)d->size);
561 tmp = realloc (d->buf, d->size);
563 kdc_log(0, "Failed to re-allocate %lu bytes.",
564 (unsigned long)d->size);
574 * Try to handle the TCP data at `d->buf, d->len'.
575 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
579 handle_vanilla_tcp (struct descr *d)
584 sp = krb5_storage_from_mem(d->buf, d->len);
586 kdc_log (0, "krb5_storage_from_mem failed");
589 krb5_ret_int32(sp, &len);
590 krb5_storage_free(sp);
591 if(d->len - 4 >= len) {
592 memmove(d->buf, d->buf + 4, d->len - 4);
599 * Try to handle the TCP/HTTP data at `d->buf, d->len'.
600 * Return -1 if failed, 0 if succesful, and 1 if data is complete.
604 handle_http_tcp (struct descr *d)
613 p = strstr(s, "\r\n");
615 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
621 t = strtok_r(s, " \t", &p);
623 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
626 t = strtok_r(NULL, " \t", &p);
628 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
631 data = malloc(strlen(t));
633 kdc_log(0, "Failed to allocate %lu bytes",
634 (unsigned long)strlen(t));
639 if(de_http(t) != 0) {
640 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
641 kdc_log(5, "Request: %s", t);
645 proto = strtok_r(NULL, " \t", &p);
647 kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
651 len = base64_decode(t, data);
655 "Server: Heimdal/" VERSION "\r\n"
656 "Cache-Control: no-cache\r\n"
657 "Pragma: no-cache\r\n"
658 "Content-type: text/html\r\n"
659 "Content-transfer-encoding: 8bit\r\n\r\n"
660 "<TITLE>404 Not found</TITLE>\r\n"
661 "<H1>404 Not found</H1>\r\n"
662 "That page doesn't exist, maybe you are looking for "
663 "<A HREF=\"http://www.pdc.kth.se/heimdal/\">Heimdal</A>?\r\n";
664 write(d->s, proto, strlen(proto));
665 write(d->s, msg, strlen(msg));
666 kdc_log(0, "HTTP request from %s is non KDC request", d->addr_string);
667 kdc_log(5, "Request: %s", t);
674 "Server: Heimdal/" VERSION "\r\n"
675 "Cache-Control: no-cache\r\n"
676 "Pragma: no-cache\r\n"
677 "Content-type: application/octet-stream\r\n"
678 "Content-transfer-encoding: binary\r\n\r\n";
679 write(d->s, proto, strlen(proto));
680 write(d->s, msg, strlen(msg));
682 memcpy(d->buf, data, len);
689 * Handle incoming data to the TCP socket in `d[index]'
693 handle_tcp(struct descr *d, int index, int min_free)
695 unsigned char buf[1024];
699 if (d[index].timeout == 0) {
700 add_new_tcp (d, index, min_free);
704 n = recvfrom(d[index].s, buf, sizeof(buf), 0, NULL, NULL);
706 krb5_warn(context, errno, "recvfrom");
709 if (grow_descr (&d[index], n))
711 memcpy(d[index].buf + d[index].len, buf, n);
713 if(d[index].len > 4 && d[index].buf[0] == 0) {
714 ret = handle_vanilla_tcp (&d[index]);
715 } else if(enable_http &&
717 strncmp((char *)d[index].buf, "GET ", 4) == 0 &&
718 strncmp((char *)d[index].buf + d[index].len - 4,
719 "\r\n\r\n", 4) == 0) {
720 ret = handle_http_tcp (&d[index]);
722 clear_descr (d + index);
723 } else if (d[index].len > 4) {
724 kdc_log (0, "TCP data of strange type from %s", d[index].addr_string);
730 do_request(d[index].buf, d[index].len, 1, &d[index]);
731 clear_descr(d + index);
741 ndescr = init_sockets(&d);
743 krb5_errx(context, 1, "No sockets!");
744 while(exit_flag == 0){
745 struct timeval tmout;
752 for(i = 0; i < ndescr; i++) {
754 if(d[i].type == SOCK_STREAM &&
755 d[i].timeout && d[i].timeout < time(NULL)) {
756 kdc_log(1, "TCP-connection from %s expired after %lu bytes",
757 d[i].addr_string, (unsigned long)d[i].len);
763 if (max_fd >= FD_SETSIZE)
764 krb5_errx(context, 1, "fd too large");
765 FD_SET(d[i].s, &fds);
766 } else if(min_free < 0 || i < min_free)
771 tmp = realloc(d, (ndescr + 4) * sizeof(*d));
773 krb5_warnx(context, "No memory");
776 reinit_descrs (d, ndescr);
777 memset(d + ndescr, 0, 4 * sizeof(*d));
778 for(i = ndescr; i < ndescr + 4; i++)
785 tmout.tv_sec = TCP_TIMEOUT;
787 switch(select(max_fd + 1, &fds, 0, 0, &tmout)){
792 krb5_warn(context, errno, "select");
795 for(i = 0; i < ndescr; i++)
796 if(d[i].s >= 0 && FD_ISSET(d[i].s, &fds)) {
797 if(d[i].type == SOCK_DGRAM)
799 else if(d[i].type == SOCK_STREAM)
800 handle_tcp(d, i, min_free);