r22969: fix some more places where we could end up with more than one event
[sfrench/samba-autobuild/.git] / source4 / auth / kerberos / krb5_init_context.c
1 /* 
2    Unix SMB/CIFS implementation.
3    Wrapper for krb5_init_context
4
5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
6    Copyright (C) Andrew Tridgell 2005
7    Copyright (C) Stefan Metzmacher 2004
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 2 of the License, or
12    (at your option) any later version.
13    
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18    
19    You should have received a copy of the GNU General Public License
20    along with this program; if not, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #include "includes.h"
25 #include "system/kerberos.h"
26 #include "heimdal/lib/krb5/krb5_locl.h"
27 #include "auth/kerberos/kerberos.h"
28 #include "lib/socket/socket.h"
29 #include "lib/stream/packet.h"
30 #include "system/network.h"
31 #include "lib/events/events.h"
32 #include "roken.h"
33
34 /*
35   context structure for operations on cldap packets
36 */
37 struct smb_krb5_socket {
38         struct socket_context *sock;
39
40         /* the fd event */
41         struct fd_event *fde;
42
43         NTSTATUS status;
44         DATA_BLOB request, reply;
45         
46         struct packet_context *packet;
47
48         size_t partial_read;
49
50         krb5_krbhst_info *hi;
51 };
52
53 static int smb_krb5_context_destroy_1(struct smb_krb5_context *ctx)
54 {
55         krb5_free_context(ctx->krb5_context); 
56         return 0;
57 }
58
59 static int smb_krb5_context_destroy_2(struct smb_krb5_context *ctx)
60 {
61         /* Otherwise krb5_free_context will try and close what we have already free()ed */
62         krb5_set_warn_dest(ctx->krb5_context, NULL);
63         krb5_closelog(ctx->krb5_context, ctx->logf);
64         smb_krb5_context_destroy_1(ctx);
65         return 0;
66 }
67
68 /* We never close down the DEBUG system, and no need to unreference the use */
69 static void smb_krb5_debug_close(void *private) {
70         return;
71 }
72
73 static void smb_krb5_debug_wrapper(const char *timestr, const char *msg, void *private) 
74 {
75         DEBUG(2, ("Kerberos: %s\n", msg));
76 }
77
78 /*
79   handle recv events on a smb_krb5 socket
80 */
81 static void smb_krb5_socket_recv(struct smb_krb5_socket *smb_krb5)
82 {
83         TALLOC_CTX *tmp_ctx = talloc_new(smb_krb5);
84         DATA_BLOB blob;
85         size_t nread, dsize;
86
87         smb_krb5->status = socket_pending(smb_krb5->sock, &dsize);
88         if (!NT_STATUS_IS_OK(smb_krb5->status)) {
89                 talloc_free(tmp_ctx);
90                 return;
91         }
92         
93         blob = data_blob_talloc(tmp_ctx, NULL, dsize);
94         if (blob.data == NULL && dsize != 0) {
95                 smb_krb5->status = NT_STATUS_NO_MEMORY;
96                 talloc_free(tmp_ctx);
97                 return;
98         }
99         
100         smb_krb5->status = socket_recv(smb_krb5->sock, blob.data, blob.length, &nread);
101         if (!NT_STATUS_IS_OK(smb_krb5->status)) {
102                 talloc_free(tmp_ctx);
103                 return;
104         }
105         blob.length = nread;
106         
107         if (nread == 0) {
108                 smb_krb5->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
109                 talloc_free(tmp_ctx);
110                 return;
111         }
112         
113         DEBUG(2,("Received smb_krb5 packet of length %d\n", 
114                  (int)blob.length));
115         
116         talloc_steal(smb_krb5, blob.data);
117         smb_krb5->reply = blob;
118         talloc_free(tmp_ctx);
119 }
120
121 static NTSTATUS smb_krb5_full_packet(void *private, DATA_BLOB data) 
122 {
123         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
124         talloc_steal(smb_krb5, data.data);
125         smb_krb5->reply = data;
126         smb_krb5->reply.length -= 4;
127         smb_krb5->reply.data += 4;
128         return NT_STATUS_OK;
129 }
130
131 /*
132   handle request timeouts
133 */
134 static void smb_krb5_request_timeout(struct event_context *event_ctx, 
135                                   struct timed_event *te, struct timeval t,
136                                   void *private)
137 {
138         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
139         DEBUG(5,("Timed out smb_krb5 packet\n"));
140         smb_krb5->status = NT_STATUS_IO_TIMEOUT;
141 }
142
143 static void smb_krb5_error_handler(void *private, NTSTATUS status) 
144 {
145         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
146         smb_krb5->status = status;
147 }
148
149 /*
150   handle send events on a smb_krb5 socket
151 */
152 static void smb_krb5_socket_send(struct smb_krb5_socket *smb_krb5)
153 {
154         NTSTATUS status;
155
156         size_t len;
157         
158         len = smb_krb5->request.length;
159         status = socket_send(smb_krb5->sock, &smb_krb5->request, &len);
160
161         if (!NT_STATUS_IS_OK(status)) return;
162         
163         EVENT_FD_READABLE(smb_krb5->fde);
164
165         EVENT_FD_NOT_WRITEABLE(smb_krb5->fde);
166         return;
167 }
168
169
170 /*
171   handle fd events on a smb_krb5_socket
172 */
173 static void smb_krb5_socket_handler(struct event_context *ev, struct fd_event *fde,
174                                  uint16_t flags, void *private)
175 {
176         struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
177         switch (smb_krb5->hi->proto) {
178         case KRB5_KRBHST_UDP:
179                 if (flags & EVENT_FD_WRITE) {
180                         smb_krb5_socket_send(smb_krb5);
181                 } 
182                 if (flags & EVENT_FD_READ) {
183                         smb_krb5_socket_recv(smb_krb5);
184                 }
185                 break;
186         case KRB5_KRBHST_TCP:
187                 if (flags & EVENT_FD_READ) {
188                         packet_recv(smb_krb5->packet);
189                 }
190                 if (flags & EVENT_FD_WRITE) {
191                         packet_queue_run(smb_krb5->packet);
192                 }
193                 break;
194         case KRB5_KRBHST_HTTP:
195                 /* can't happen */
196                 break;
197         }
198 }
199
200
201 krb5_error_code smb_krb5_send_and_recv_func(krb5_context context,
202                                             void *data,
203                                             krb5_krbhst_info *hi,
204                                             const krb5_data *send_buf,
205                                             krb5_data *recv_buf)
206 {
207         krb5_error_code ret;
208         NTSTATUS status;
209         struct socket_address *remote_addr;
210         const char *name;
211         struct addrinfo *ai, *a;
212         struct smb_krb5_socket *smb_krb5;
213
214         struct event_context *ev = talloc_get_type(data, struct event_context);
215
216         DATA_BLOB send_blob = data_blob_const(send_buf->data, send_buf->length);
217
218         ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
219         if (ret) {
220                 return ret;
221         }
222
223         for (a = ai; a; a = ai->ai_next) {
224                 smb_krb5 = talloc(NULL, struct smb_krb5_socket);
225                 if (!smb_krb5) {
226                         return ENOMEM;
227                 }
228                 smb_krb5->hi = hi;
229                 
230                 switch (a->ai_family) {
231                 case PF_INET:
232                         name = "ipv4";
233                         break;
234 #ifdef HAVE_IPV6
235                 case PF_INET6:
236                         name = "ipv6";
237                         break;
238 #endif
239                 default:
240                         talloc_free(smb_krb5);
241                         return EINVAL;
242                 }
243                 
244                 status = NT_STATUS_INVALID_PARAMETER;
245                 switch (hi->proto) {
246                 case KRB5_KRBHST_UDP:
247                         if (lp_parm_bool(-1, "krb5", "udp", True)) {
248                                 status = socket_create(name, SOCKET_TYPE_DGRAM, &smb_krb5->sock, 0);
249                         }
250                         break;
251                 case KRB5_KRBHST_TCP:
252                         if (lp_parm_bool(-1, "krb5", "tcp", True)) {
253                                 status = socket_create(name, SOCKET_TYPE_STREAM, &smb_krb5->sock, 0);
254                         }
255                         break;
256                 case KRB5_KRBHST_HTTP:
257                         talloc_free(smb_krb5);
258                         return EINVAL;
259                 }
260                 if (!NT_STATUS_IS_OK(status)) {
261                         talloc_free(smb_krb5);
262                         continue;
263                 }
264
265                 talloc_steal(smb_krb5, smb_krb5->sock);
266                 
267                 remote_addr = socket_address_from_sockaddr(smb_krb5, a->ai_addr, a->ai_addrlen); 
268                 if (!remote_addr) {
269                         talloc_free(smb_krb5);
270                         continue;
271                 }
272
273                 status = socket_connect_ev(smb_krb5->sock, NULL, remote_addr, 0, ev); 
274                 if (!NT_STATUS_IS_OK(status)) {
275                         talloc_free(smb_krb5);
276                         continue;
277                 }
278                 talloc_free(remote_addr);
279
280                 smb_krb5->fde = event_add_fd(ev, smb_krb5->sock, 
281                                              socket_get_fd(smb_krb5->sock), 
282                                              EVENT_FD_AUTOCLOSE,
283                                              smb_krb5_socket_handler, smb_krb5);
284                 /* its now the job of the event layer to close the socket */
285                 socket_set_flags(smb_krb5->sock, SOCKET_FLAG_NOCLOSE);
286
287                 event_add_timed(ev, smb_krb5, 
288                                 timeval_current_ofs(context->kdc_timeout, 0),
289                                 smb_krb5_request_timeout, smb_krb5);
290
291                 
292                 smb_krb5->status = NT_STATUS_OK;
293                 smb_krb5->reply = data_blob(NULL, 0);
294
295                 switch (hi->proto) {
296                 case KRB5_KRBHST_UDP:
297                         EVENT_FD_WRITEABLE(smb_krb5->fde);
298                         smb_krb5->request = send_blob;
299                         break;
300                 case KRB5_KRBHST_TCP:
301
302                         smb_krb5->packet = packet_init(smb_krb5);
303                         if (smb_krb5->packet == NULL) {
304                                 talloc_free(smb_krb5);
305                                 return ENOMEM;
306                         }
307                         packet_set_private(smb_krb5->packet, smb_krb5);
308                         packet_set_socket(smb_krb5->packet, smb_krb5->sock);
309                         packet_set_callback(smb_krb5->packet, smb_krb5_full_packet);
310                         packet_set_full_request(smb_krb5->packet, packet_full_request_u32);
311                         packet_set_error_handler(smb_krb5->packet, smb_krb5_error_handler);
312                         packet_set_event_context(smb_krb5->packet, ev);
313                         packet_set_fde(smb_krb5->packet, smb_krb5->fde);
314
315                         smb_krb5->request = data_blob_talloc(smb_krb5, NULL, send_blob.length + 4);
316                         RSIVAL(smb_krb5->request.data, 0, send_blob.length);
317                         memcpy(smb_krb5->request.data+4, send_blob.data, send_blob.length);
318                         packet_send(smb_krb5->packet, smb_krb5->request);
319                         EVENT_FD_READABLE(smb_krb5->fde);
320                         break;
321                 case KRB5_KRBHST_HTTP:
322                         talloc_free(smb_krb5);
323                         return EINVAL;
324                 }
325                 while ((NT_STATUS_IS_OK(smb_krb5->status)) && !smb_krb5->reply.length) {
326                         if (event_loop_once(ev) != 0) {
327                                 talloc_free(smb_krb5);
328                                 return EINVAL;
329                         }
330                 }
331                 if (NT_STATUS_EQUAL(smb_krb5->status, NT_STATUS_IO_TIMEOUT)) {
332                         talloc_free(smb_krb5);
333                         continue;
334                 }
335
336                 if (!NT_STATUS_IS_OK(smb_krb5->status)) {
337                         DEBUG(2,("Error reading smb_krb5 reply packet: %s\n", nt_errstr(smb_krb5->status)));
338                         talloc_free(smb_krb5);
339                         continue;
340                 }
341
342                 ret = krb5_data_copy(recv_buf, smb_krb5->reply.data, smb_krb5->reply.length);
343                 if (ret) {
344                         talloc_free(smb_krb5);
345                         return ret;
346                 }
347                 talloc_free(smb_krb5);
348                 
349                 break;
350         }
351         if (a) {
352                 return 0;
353         }
354         return KRB5_KDC_UNREACH;
355 }
356
357 krb5_error_code smb_krb5_init_context(void *parent_ctx, 
358                                       struct event_context *ev,
359                                        struct smb_krb5_context **smb_krb5_context) 
360 {
361         krb5_error_code ret;
362         TALLOC_CTX *tmp_ctx;
363         char **config_files;
364         const char *config_file;
365         
366         initialize_krb5_error_table();
367         
368         tmp_ctx = talloc_new(parent_ctx);
369         *smb_krb5_context = talloc(tmp_ctx, struct smb_krb5_context);
370
371         if (!*smb_krb5_context || !tmp_ctx) {
372                 talloc_free(tmp_ctx);
373                 return ENOMEM;
374         }
375
376         ret = krb5_init_context(&(*smb_krb5_context)->krb5_context);
377         if (ret) {
378                 DEBUG(1,("krb5_init_context failed (%s)\n", 
379                          error_message(ret)));
380                 talloc_free(tmp_ctx);
381                 return ret;
382         }
383
384         talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy_1);
385
386         config_file = config_path(tmp_ctx, "krb5.conf");
387         if (!config_file) {
388                 talloc_free(tmp_ctx);
389                 return ENOMEM;
390         }
391                 
392         /* Use our local krb5.conf file by default */
393         ret = krb5_prepend_config_files_default(config_file, &config_files);
394         if (ret) {
395                 DEBUG(1,("krb5_prepend_config_files_default failed (%s)\n", 
396                          smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
397                 talloc_free(tmp_ctx);
398                 return ret;
399         }
400
401         ret = krb5_set_config_files((*smb_krb5_context)->krb5_context, 
402                                     config_files);
403         krb5_free_config_files(config_files);
404         if (ret) {
405                 DEBUG(1,("krb5_set_config_files failed (%s)\n", 
406                          smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
407                 talloc_free(tmp_ctx);
408                 return ret;
409         }
410                                                 
411         if (lp_realm() && *lp_realm()) {
412                 char *upper_realm = strupper_talloc(tmp_ctx, lp_realm());
413                 if (!upper_realm) {
414                         DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm()));
415                         talloc_free(tmp_ctx);
416                         return ENOMEM;
417                 }
418                 ret = krb5_set_default_realm((*smb_krb5_context)->krb5_context, upper_realm);
419                 if (ret) {
420                         DEBUG(1,("krb5_set_default_realm failed (%s)\n", 
421                                  smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
422                         talloc_free(tmp_ctx);
423                         return ret;
424                 }
425         }
426
427         /* TODO: Should we have a different name here? */
428         ret = krb5_initlog((*smb_krb5_context)->krb5_context, "Samba", &(*smb_krb5_context)->logf);
429         
430         if (ret) {
431                 DEBUG(1,("krb5_initlog failed (%s)\n", 
432                          smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
433                 talloc_free(tmp_ctx);
434                 return ret;
435         }
436
437         talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy_2);
438
439         ret = krb5_addlog_func((*smb_krb5_context)->krb5_context, (*smb_krb5_context)->logf, 0 /* min */, -1 /* max */, 
440                                smb_krb5_debug_wrapper, smb_krb5_debug_close, NULL);
441         if (ret) {
442                 DEBUG(1,("krb5_addlog_func failed (%s)\n", 
443                          smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
444                 talloc_free(tmp_ctx);
445                 return ret;
446         }
447         krb5_set_warn_dest((*smb_krb5_context)->krb5_context, (*smb_krb5_context)->logf);
448
449         /* Set use of our socket lib */
450         ret = krb5_set_send_to_kdc_func((*smb_krb5_context)->krb5_context, 
451                                         smb_krb5_send_and_recv_func, 
452                                         ev);
453         if (ret) {
454                 DEBUG(1,("krb5_set_send_recv_func failed (%s)\n", 
455                          smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
456                 talloc_free(tmp_ctx);
457                 return ret;
458         }
459
460         talloc_steal(parent_ctx, *smb_krb5_context);
461         talloc_free(tmp_ctx);
462
463         /* Set options in kerberos */
464
465         krb5_set_dns_canonicalize_hostname((*smb_krb5_context)->krb5_context,
466                                            lp_parm_bool(-1, "krb5", "set_dns_canonicalize", false));
467
468         return 0;
469 }
470