2 Unix SMB/CIFS implementation.
3 Wrapper for krb5_init_context
5 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
6 Copyright (C) Andrew Tridgell 2005
7 Copyright (C) Stefan Metzmacher 2004
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 3 of the License, or
12 (at your option) any later version.
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.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "system/kerberos.h"
26 #include "auth/kerberos/kerberos.h"
27 #include "lib/socket/socket.h"
28 #include "lib/stream/packet.h"
29 #include "system/network.h"
30 #include "param/param.h"
31 #include "libcli/resolve/resolve.h"
32 #include "../lib/tsocket/tsocket.h"
35 context structure for operations on cldap packets
37 struct smb_krb5_socket
{
38 struct socket_context
*sock
;
41 struct tevent_fd
*fde
;
44 DATA_BLOB request
, reply
;
46 struct packet_context
*packet
;
53 static krb5_error_code
smb_krb5_context_destroy(struct smb_krb5_context
*ctx
)
55 /* Otherwise krb5_free_context will try and close what we have already free()ed */
56 krb5_set_warn_dest(ctx
->krb5_context
, NULL
);
57 krb5_closelog(ctx
->krb5_context
, ctx
->logf
);
58 krb5_free_context(ctx
->krb5_context
);
62 /* We never close down the DEBUG system, and no need to unreference the use */
63 static void smb_krb5_debug_close(void *private_data
) {
67 static void smb_krb5_debug_wrapper(const char *timestr
, const char *msg
, void *private_data
)
69 DEBUG(3, ("Kerberos: %s\n", msg
));
73 handle recv events on a smb_krb5 socket
75 static void smb_krb5_socket_recv(struct smb_krb5_socket
*smb_krb5
)
77 TALLOC_CTX
*tmp_ctx
= talloc_new(smb_krb5
);
81 smb_krb5
->status
= socket_pending(smb_krb5
->sock
, &dsize
);
82 if (!NT_STATUS_IS_OK(smb_krb5
->status
)) {
87 blob
= data_blob_talloc(tmp_ctx
, NULL
, dsize
);
88 if (blob
.data
== NULL
&& dsize
!= 0) {
89 smb_krb5
->status
= NT_STATUS_NO_MEMORY
;
94 smb_krb5
->status
= socket_recv(smb_krb5
->sock
, blob
.data
, blob
.length
, &nread
);
95 if (!NT_STATUS_IS_OK(smb_krb5
->status
)) {
102 smb_krb5
->status
= NT_STATUS_UNEXPECTED_NETWORK_ERROR
;
103 talloc_free(tmp_ctx
);
107 DEBUG(4,("Received smb_krb5 packet of length %d\n",
110 talloc_steal(smb_krb5
, blob
.data
);
111 smb_krb5
->reply
= blob
;
112 talloc_free(tmp_ctx
);
115 static NTSTATUS
smb_krb5_full_packet(void *private_data
, DATA_BLOB data
)
117 struct smb_krb5_socket
*smb_krb5
= talloc_get_type(private_data
, struct smb_krb5_socket
);
118 talloc_steal(smb_krb5
, data
.data
);
119 smb_krb5
->reply
= data
;
120 smb_krb5
->reply
.length
-= 4;
121 smb_krb5
->reply
.data
+= 4;
126 handle request timeouts
128 static void smb_krb5_request_timeout(struct tevent_context
*event_ctx
,
129 struct tevent_timer
*te
, struct timeval t
,
132 struct smb_krb5_socket
*smb_krb5
= talloc_get_type(private_data
, struct smb_krb5_socket
);
133 DEBUG(5,("Timed out smb_krb5 packet\n"));
134 smb_krb5
->status
= NT_STATUS_IO_TIMEOUT
;
137 static void smb_krb5_error_handler(void *private_data
, NTSTATUS status
)
139 struct smb_krb5_socket
*smb_krb5
= talloc_get_type(private_data
, struct smb_krb5_socket
);
140 smb_krb5
->status
= status
;
144 handle send events on a smb_krb5 socket
146 static void smb_krb5_socket_send(struct smb_krb5_socket
*smb_krb5
)
152 len
= smb_krb5
->request
.length
;
153 status
= socket_send(smb_krb5
->sock
, &smb_krb5
->request
, &len
);
155 if (!NT_STATUS_IS_OK(status
)) return;
157 TEVENT_FD_READABLE(smb_krb5
->fde
);
159 TEVENT_FD_NOT_WRITEABLE(smb_krb5
->fde
);
165 handle fd events on a smb_krb5_socket
167 static void smb_krb5_socket_handler(struct tevent_context
*ev
, struct tevent_fd
*fde
,
168 uint16_t flags
, void *private_data
)
170 struct smb_krb5_socket
*smb_krb5
= talloc_get_type(private_data
, struct smb_krb5_socket
);
171 switch (smb_krb5
->hi
->proto
) {
172 case KRB5_KRBHST_UDP
:
173 if (flags
& TEVENT_FD_READ
) {
174 smb_krb5_socket_recv(smb_krb5
);
177 if (flags
& TEVENT_FD_WRITE
) {
178 smb_krb5_socket_send(smb_krb5
);
183 case KRB5_KRBHST_TCP
:
184 if (flags
& TEVENT_FD_READ
) {
185 packet_recv(smb_krb5
->packet
);
188 if (flags
& TEVENT_FD_WRITE
) {
189 packet_queue_run(smb_krb5
->packet
);
194 case KRB5_KRBHST_HTTP
:
201 krb5_error_code
smb_krb5_send_and_recv_func(krb5_context context
,
203 krb5_krbhst_info
*hi
,
205 const krb5_data
*send_buf
,
211 struct addrinfo
*ai
, *a
;
212 struct smb_krb5_socket
*smb_krb5
;
216 struct tevent_context
*ev
;
217 TALLOC_CTX
*tmp_ctx
= talloc_new(NULL
);
223 /* If no event context was available, then create one for this loop */
224 ev
= tevent_context_init(tmp_ctx
);
226 talloc_free(tmp_ctx
);
230 ev
= talloc_get_type_abort(data
, struct tevent_context
);
233 send_blob
= data_blob_const(send_buf
->data
, send_buf
->length
);
235 ret
= krb5_krbhst_get_addrinfo(context
, hi
, &ai
);
237 talloc_free(tmp_ctx
);
241 for (a
= ai
; a
; a
= a
->ai_next
) {
242 struct socket_address
*remote_addr
;
243 smb_krb5
= talloc(tmp_ctx
, struct smb_krb5_socket
);
245 talloc_free(tmp_ctx
);
250 switch (a
->ai_family
) {
260 talloc_free(tmp_ctx
);
264 status
= NT_STATUS_INVALID_PARAMETER
;
266 case KRB5_KRBHST_UDP
:
267 status
= socket_create(name
, SOCKET_TYPE_DGRAM
, &smb_krb5
->sock
, 0);
269 case KRB5_KRBHST_TCP
:
270 status
= socket_create(name
, SOCKET_TYPE_STREAM
, &smb_krb5
->sock
, 0);
272 case KRB5_KRBHST_HTTP
:
273 talloc_free(tmp_ctx
);
276 if (!NT_STATUS_IS_OK(status
)) {
277 talloc_free(smb_krb5
);
281 talloc_steal(smb_krb5
, smb_krb5
->sock
);
283 remote_addr
= socket_address_from_sockaddr(smb_krb5
, a
->ai_addr
, a
->ai_addrlen
);
285 talloc_free(smb_krb5
);
289 status
= socket_connect_ev(smb_krb5
->sock
, NULL
, remote_addr
, 0, ev
);
290 if (!NT_STATUS_IS_OK(status
)) {
291 talloc_free(smb_krb5
);
295 /* Setup the FDE, start listening for read events
296 * from the start (otherwise we may miss a socket
297 * drop) and mark as AUTOCLOSE along with the fde */
299 /* Ths is equivilant to EVENT_FD_READABLE(smb_krb5->fde) */
300 smb_krb5
->fde
= tevent_add_fd(ev
, smb_krb5
->sock
,
301 socket_get_fd(smb_krb5
->sock
),
303 smb_krb5_socket_handler
, smb_krb5
);
304 /* its now the job of the event layer to close the socket */
305 tevent_fd_set_close_fn(smb_krb5
->fde
, socket_tevent_fd_close_fn
);
306 socket_set_flags(smb_krb5
->sock
, SOCKET_FLAG_NOCLOSE
);
308 tevent_add_timer(ev
, smb_krb5
,
309 timeval_current_ofs(timeout
, 0),
310 smb_krb5_request_timeout
, smb_krb5
);
312 smb_krb5
->status
= NT_STATUS_OK
;
313 smb_krb5
->reply
= data_blob(NULL
, 0);
316 case KRB5_KRBHST_UDP
:
317 TEVENT_FD_WRITEABLE(smb_krb5
->fde
);
318 smb_krb5
->request
= send_blob
;
320 case KRB5_KRBHST_TCP
:
322 smb_krb5
->packet
= packet_init(smb_krb5
);
323 if (smb_krb5
->packet
== NULL
) {
324 talloc_free(smb_krb5
);
327 packet_set_private(smb_krb5
->packet
, smb_krb5
);
328 packet_set_socket(smb_krb5
->packet
, smb_krb5
->sock
);
329 packet_set_callback(smb_krb5
->packet
, smb_krb5_full_packet
);
330 packet_set_full_request(smb_krb5
->packet
, packet_full_request_u32
);
331 packet_set_error_handler(smb_krb5
->packet
, smb_krb5_error_handler
);
332 packet_set_event_context(smb_krb5
->packet
, ev
);
333 packet_set_fde(smb_krb5
->packet
, smb_krb5
->fde
);
335 smb_krb5
->request
= data_blob_talloc(smb_krb5
, NULL
, send_blob
.length
+ 4);
336 RSIVAL(smb_krb5
->request
.data
, 0, send_blob
.length
);
337 memcpy(smb_krb5
->request
.data
+4, send_blob
.data
, send_blob
.length
);
338 packet_send(smb_krb5
->packet
, smb_krb5
->request
);
340 case KRB5_KRBHST_HTTP
:
341 talloc_free(tmp_ctx
);
344 while ((NT_STATUS_IS_OK(smb_krb5
->status
)) && !smb_krb5
->reply
.length
) {
345 if (tevent_loop_once(ev
) != 0) {
346 talloc_free(tmp_ctx
);
350 /* After each and every event loop, reset the
351 * send_to_kdc pointers to what they were when
352 * we entered this loop. That way, if a
353 * nested event has invalidated them, we put
354 * it back before we return to the heimdal
356 ret
= krb5_set_send_to_kdc_func(context
,
357 smb_krb5_send_and_recv_func
,
360 talloc_free(tmp_ctx
);
364 if (NT_STATUS_EQUAL(smb_krb5
->status
, NT_STATUS_IO_TIMEOUT
)) {
365 talloc_free(smb_krb5
);
369 if (!NT_STATUS_IS_OK(smb_krb5
->status
)) {
370 struct tsocket_address
*addr
= socket_address_to_tsocket_address(smb_krb5
, remote_addr
);
371 const char *addr_string
= NULL
;
373 addr_string
= tsocket_address_inet_addr_string(addr
, smb_krb5
);
377 DEBUG(2,("Error reading smb_krb5 reply packet: %s from %s\n", nt_errstr(smb_krb5
->status
),
379 talloc_free(smb_krb5
);
383 ret
= krb5_data_copy(recv_buf
, smb_krb5
->reply
.data
, smb_krb5
->reply
.length
);
385 talloc_free(tmp_ctx
);
388 talloc_free(smb_krb5
);
392 talloc_free(tmp_ctx
);
396 return KRB5_KDC_UNREACH
;
400 smb_krb5_init_context_basic(TALLOC_CTX
*tmp_ctx
,
401 struct loadparm_context
*lp_ctx
,
402 krb5_context
*_krb5_context
)
406 const char *config_file
, *realm
;
407 krb5_context krb5_ctx
;
409 initialize_krb5_error_table();
411 ret
= krb5_init_context(&krb5_ctx
);
413 DEBUG(1,("krb5_init_context failed (%s)\n",
414 error_message(ret
)));
418 config_file
= lpcfg_config_path(tmp_ctx
, lp_ctx
, "krb5.conf");
420 krb5_free_context(krb5_ctx
);
424 /* Use our local krb5.conf file by default */
425 ret
= krb5_prepend_config_files_default(config_file
== NULL
?"":config_file
, &config_files
);
427 DEBUG(1,("krb5_prepend_config_files_default failed (%s)\n",
428 smb_get_krb5_error_message(krb5_ctx
, ret
, tmp_ctx
)));
429 krb5_free_context(krb5_ctx
);
433 ret
= krb5_set_config_files(krb5_ctx
, config_files
);
434 krb5_free_config_files(config_files
);
436 DEBUG(1,("krb5_set_config_files failed (%s)\n",
437 smb_get_krb5_error_message(krb5_ctx
, ret
, tmp_ctx
)));
438 krb5_free_context(krb5_ctx
);
442 realm
= lpcfg_realm(lp_ctx
);
444 ret
= krb5_set_default_realm(krb5_ctx
, realm
);
446 DEBUG(1,("krb5_set_default_realm failed (%s)\n",
447 smb_get_krb5_error_message(krb5_ctx
, ret
, tmp_ctx
)));
448 krb5_free_context(krb5_ctx
);
453 *_krb5_context
= krb5_ctx
;
457 krb5_error_code
smb_krb5_init_context(void *parent_ctx
,
458 struct tevent_context
*ev
,
459 struct loadparm_context
*lp_ctx
,
460 struct smb_krb5_context
**smb_krb5_context
)
465 initialize_krb5_error_table();
467 tmp_ctx
= talloc_new(parent_ctx
);
468 *smb_krb5_context
= talloc_zero(tmp_ctx
, struct smb_krb5_context
);
470 if (!*smb_krb5_context
|| !tmp_ctx
) {
471 talloc_free(tmp_ctx
);
475 ret
= smb_krb5_init_context_basic(tmp_ctx
, lp_ctx
,
476 &(*smb_krb5_context
)->krb5_context
);
478 DEBUG(1,("smb_krb5_context_init_basic failed (%s)\n",
479 error_message(ret
)));
480 talloc_free(tmp_ctx
);
484 /* TODO: Should we have a different name here? */
485 ret
= krb5_initlog((*smb_krb5_context
)->krb5_context
, "Samba", &(*smb_krb5_context
)->logf
);
488 DEBUG(1,("krb5_initlog failed (%s)\n",
489 smb_get_krb5_error_message((*smb_krb5_context
)->krb5_context
, ret
, tmp_ctx
)));
490 krb5_free_context((*smb_krb5_context
)->krb5_context
);
491 talloc_free(tmp_ctx
);
495 talloc_set_destructor(*smb_krb5_context
, smb_krb5_context_destroy
);
497 ret
= krb5_addlog_func((*smb_krb5_context
)->krb5_context
, (*smb_krb5_context
)->logf
, 0 /* min */, -1 /* max */,
498 smb_krb5_debug_wrapper
, smb_krb5_debug_close
, NULL
);
500 DEBUG(1,("krb5_addlog_func failed (%s)\n",
501 smb_get_krb5_error_message((*smb_krb5_context
)->krb5_context
, ret
, tmp_ctx
)));
502 talloc_free(tmp_ctx
);
505 krb5_set_warn_dest((*smb_krb5_context
)->krb5_context
, (*smb_krb5_context
)->logf
);
507 /* Set use of our socket lib */
509 struct tevent_context
*previous_ev
;
510 ret
= smb_krb5_context_set_event_ctx(*smb_krb5_context
,
513 talloc_free(tmp_ctx
);
518 talloc_steal(parent_ctx
, *smb_krb5_context
);
519 talloc_free(tmp_ctx
);
521 /* Set options in kerberos */
523 krb5_set_dns_canonicalize_hostname((*smb_krb5_context
)->krb5_context
,
524 lpcfg_parm_bool(lp_ctx
, NULL
, "krb5", "set_dns_canonicalize", false));
529 krb5_error_code
smb_krb5_context_set_event_ctx(struct smb_krb5_context
*smb_krb5_context
,
530 struct tevent_context
*ev
,
531 struct tevent_context
**previous_ev
)
538 *previous_ev
= smb_krb5_context
->current_ev
;
540 smb_krb5_context
->current_ev
= talloc_reference(smb_krb5_context
, ev
);
541 if (!smb_krb5_context
->current_ev
) {
545 /* Set use of our socket lib */
546 ret
= krb5_set_send_to_kdc_func(smb_krb5_context
->krb5_context
,
547 smb_krb5_send_and_recv_func
,
550 TALLOC_CTX
*tmp_ctx
= talloc_new(NULL
);
551 DEBUG(1,("krb5_set_send_recv_func failed (%s)\n",
552 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
, ret
, tmp_ctx
)));
553 talloc_free(tmp_ctx
);
554 talloc_unlink(smb_krb5_context
, smb_krb5_context
->current_ev
);
555 smb_krb5_context
->current_ev
= NULL
;
561 krb5_error_code
smb_krb5_context_remove_event_ctx(struct smb_krb5_context
*smb_krb5_context
,
562 struct tevent_context
*previous_ev
,
563 struct tevent_context
*ev
)
566 talloc_unlink(smb_krb5_context
, ev
);
567 /* If there was a mismatch with things happening on a stack, then don't wipe things */
568 smb_krb5_context
->current_ev
= previous_ev
;
569 /* Set use of our socket lib */
570 ret
= krb5_set_send_to_kdc_func(smb_krb5_context
->krb5_context
,
571 smb_krb5_send_and_recv_func
,
574 TALLOC_CTX
*tmp_ctx
= talloc_new(NULL
);
575 DEBUG(1,("krb5_set_send_recv_func failed (%s)\n",
576 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
, ret
, tmp_ctx
)));
577 talloc_free(tmp_ctx
);