2 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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18 * may be used to endorse or promote products derived from this software
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34 #include "krb5_locl.h"
36 RCSID("$Id: send_to_kdc.c,v 1.56 2005/06/17 04:33:11 lha Exp $");
39 * send the data in `req' on the socket `fd' (which is datagram iff udp)
40 * waiting `tmout' for a reply and returning the reply in `rep'.
41 * iff limit read up to this many bytes
42 * returns 0 and data in `rep' if succesful, otherwise -1
53 struct timeval timeout;
57 if (fd >= FD_SETSIZE) {
65 timeout.tv_sec = tmout;
67 ret = select (fd + 1, &fdset, NULL, NULL, &timeout);
72 } else if (ret == 0) {
77 if (ioctl (fd, FIONREAD, &nbytes) < 0) {
85 nbytes = min(nbytes, limit - rep->length);
87 tmp = realloc (rep->data, rep->length + nbytes);
93 ret = recv (fd, (char*)tmp + rep->length, nbytes, 0);
100 } while(!udp && (limit == 0 || rep->length < limit));
105 * Send kerberos requests and receive a reply on a udp or any other kind
106 * of a datagram socket. See `recv_loop'.
110 send_and_recv_udp(int fd,
112 const krb5_data *req,
115 if (send (fd, req->data, req->length, 0) < 0)
118 return recv_loop(fd, tmout, 1, 0, rep);
122 * `send_and_recv' for a TCP (or any other stream) socket.
123 * Since there are no record limits on a stream socket the protocol here
124 * is to prepend the request with 4 bytes of its length and the reply
125 * is similarly encoded.
129 send_and_recv_tcp(int fd,
131 const krb5_data *req,
134 unsigned char len[4];
135 unsigned long rep_len;
138 _krb5_put_int(len, req->length, 4);
139 if(net_write(fd, len, sizeof(len)) < 0)
141 if(net_write(fd, req->data, req->length) < 0)
143 if (recv_loop (fd, tmout, 0, 4, &len_data) < 0)
145 if (len_data.length != 4) {
146 krb5_data_free (&len_data);
149 _krb5_get_int(len_data.data, &rep_len, 4);
150 krb5_data_free (&len_data);
151 if (recv_loop (fd, tmout, 0, rep_len, rep) < 0)
153 if(rep->length != rep_len) {
154 krb5_data_free (rep);
161 _krb5_send_and_recv_tcp(int fd,
163 const krb5_data *req,
166 return send_and_recv_tcp(fd, tmout, req, rep);
170 * `send_and_recv' tailored for the HTTP protocol.
174 send_and_recv_http(int fd,
177 const krb5_data *req,
183 int len = base64_encode(req->data, req->length, &str);
187 asprintf(&request, "GET %s%s HTTP/1.0\r\n\r\n", prefix, str);
191 ret = net_write (fd, request, strlen(request));
195 ret = recv_loop(fd, tmout, 0, 0, rep);
199 unsigned long rep_len;
202 s = realloc(rep->data, rep->length + 1);
204 krb5_data_free (rep);
208 p = strstr(s, "\r\n\r\n");
215 rep->length -= p - s;
216 if(rep->length < 4) { /* remove length */
221 _krb5_get_int(p, &rep_len, 4);
222 if (rep_len != rep->length) {
226 memmove(rep->data, p + 4, rep->length);
232 init_port(const char *s, int fallback)
237 sscanf (s, "%d", &tmp);
244 * Return 0 if succesful, otherwise 1
248 send_via_proxy (krb5_context context,
249 const krb5_krbhst_info *hi,
250 const krb5_data *send_data,
253 char *proxy2 = strdup(context->http_proxy);
254 char *proxy = proxy2;
257 struct addrinfo hints;
258 struct addrinfo *ai, *a;
261 char portstr[NI_MAXSERV];
265 if (strncmp (proxy, "http://", 7) == 0)
268 colon = strchr(proxy, ':');
271 memset (&hints, 0, sizeof(hints));
272 hints.ai_family = PF_UNSPEC;
273 hints.ai_socktype = SOCK_STREAM;
274 snprintf (portstr, sizeof(portstr), "%d",
275 ntohs(init_port (colon, htons(80))));
276 ret = getaddrinfo (proxy, portstr, &hints, &ai);
279 return krb5_eai_to_heim_errno(ret, errno);
281 for (a = ai; a != NULL; a = a->ai_next) {
282 s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
285 if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
297 asprintf(&prefix, "http://%s/", hi->hostname);
302 ret = send_and_recv_http(s, context->kdc_timeout,
303 prefix, send_data, receive);
306 if(ret == 0 && receive->length != 0)
312 * Send the data `send' to one host from `handle` and get back the reply
316 krb5_error_code KRB5_LIB_FUNCTION
317 krb5_sendto (krb5_context context,
318 const krb5_data *send_data,
319 krb5_krbhst_handle handle,
322 krb5_error_code ret = 0;
326 for (i = 0; i < context->max_retries; ++i) {
327 krb5_krbhst_info *hi;
329 while (krb5_krbhst_next(context, handle, &hi) == 0) {
330 struct addrinfo *ai, *a;
332 if(hi->proto == KRB5_KRBHST_HTTP && context->http_proxy) {
333 if (send_via_proxy (context, hi, send_data, receive))
339 ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
343 for (a = ai; a != NULL; a = a->ai_next) {
344 fd = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
347 if (connect (fd, a->ai_addr, a->ai_addrlen) < 0) {
352 case KRB5_KRBHST_HTTP :
353 ret = send_and_recv_http(fd, context->kdc_timeout,
354 "", send_data, receive);
356 case KRB5_KRBHST_TCP :
357 ret = send_and_recv_tcp (fd, context->kdc_timeout,
360 case KRB5_KRBHST_UDP :
361 ret = send_and_recv_udp (fd, context->kdc_timeout,
366 if(ret == 0 && receive->length != 0)
370 krb5_krbhst_reset(context, handle);
372 krb5_clear_error_string (context);
373 ret = KRB5_KDC_UNREACH;
378 krb5_error_code KRB5_LIB_FUNCTION
379 krb5_sendto_kdc(krb5_context context,
380 const krb5_data *send_data,
381 const krb5_realm *realm,
384 return krb5_sendto_kdc_flags(context, send_data, realm, receive, 0);
387 krb5_error_code KRB5_LIB_FUNCTION
388 krb5_sendto_kdc_flags(krb5_context context,
389 const krb5_data *send_data,
390 const krb5_realm *realm,
395 krb5_krbhst_handle handle;
398 if ((flags & KRB5_KRBHST_FLAGS_MASTER) || context->use_admin_kdc)
399 type = KRB5_KRBHST_ADMIN;
401 type = KRB5_KRBHST_KDC;
403 if (send_data->length > context->large_msg_size)
404 flags |= KRB5_KRBHST_FLAGS_LARGE_MSG;
406 ret = krb5_krbhst_init_flags(context, *realm, type, flags, &handle);
410 ret = krb5_sendto(context, send_data, handle, receive);
411 krb5_krbhst_free(context, handle);
412 if (ret == KRB5_KDC_UNREACH)
413 krb5_set_error_string(context,
414 "unable to reach any KDC in realm %s", *realm);