6a747ca3601c241dbc2ca5a8f63c6dddc022ad14
[vlendec/samba-autobuild/.git] / auth / gensec / gensec.c
1 /*
2    Unix SMB/CIFS implementation.
3
4    Generic Authentication Interface
5
6    Copyright (C) Andrew Tridgell 2003
7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2006
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 3 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, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "system/network.h"
25 #define TEVENT_DEPRECATED 1
26 #include <tevent.h>
27 #include "lib/tsocket/tsocket.h"
28 #include "lib/util/tevent_ntstatus.h"
29 #include "auth/gensec/gensec.h"
30 #include "auth/gensec/gensec_internal.h"
31 #include "librpc/gen_ndr/dcerpc.h"
32 #include "auth/common_auth.h"
33
34 _PRIVATE_ NTSTATUS gensec_may_reset_crypto(struct gensec_security *gensec_security,
35                                            bool full_reset)
36 {
37         if (!gensec_security->ops->may_reset_crypto) {
38                 return NT_STATUS_OK;
39         }
40
41         return gensec_security->ops->may_reset_crypto(gensec_security, full_reset);
42 }
43
44 /*
45   wrappers for the gensec function pointers
46 */
47 _PUBLIC_ NTSTATUS gensec_unseal_packet(struct gensec_security *gensec_security,
48                               uint8_t *data, size_t length,
49                               const uint8_t *whole_pdu, size_t pdu_length,
50                               const DATA_BLOB *sig)
51 {
52         if (!gensec_security->ops->unseal_packet) {
53                 return NT_STATUS_NOT_IMPLEMENTED;
54         }
55         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
56                 return NT_STATUS_INVALID_PARAMETER;
57         }
58         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
59                 return NT_STATUS_INVALID_PARAMETER;
60         }
61         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_DCE_STYLE)) {
62                 return NT_STATUS_INVALID_PARAMETER;
63         }
64
65         return gensec_security->ops->unseal_packet(gensec_security,
66                                                    data, length,
67                                                    whole_pdu, pdu_length,
68                                                    sig);
69 }
70
71 _PUBLIC_ NTSTATUS gensec_check_packet(struct gensec_security *gensec_security,
72                              const uint8_t *data, size_t length,
73                              const uint8_t *whole_pdu, size_t pdu_length,
74                              const DATA_BLOB *sig)
75 {
76         if (!gensec_security->ops->check_packet) {
77                 return NT_STATUS_NOT_IMPLEMENTED;
78         }
79         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
80                 return NT_STATUS_INVALID_PARAMETER;
81         }
82
83         return gensec_security->ops->check_packet(gensec_security, data, length, whole_pdu, pdu_length, sig);
84 }
85
86 _PUBLIC_ NTSTATUS gensec_seal_packet(struct gensec_security *gensec_security,
87                             TALLOC_CTX *mem_ctx,
88                             uint8_t *data, size_t length,
89                             const uint8_t *whole_pdu, size_t pdu_length,
90                             DATA_BLOB *sig)
91 {
92         if (!gensec_security->ops->seal_packet) {
93                 return NT_STATUS_NOT_IMPLEMENTED;
94         }
95         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
96                 return NT_STATUS_INVALID_PARAMETER;
97         }
98         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
99                 return NT_STATUS_INVALID_PARAMETER;
100         }
101         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_DCE_STYLE)) {
102                 return NT_STATUS_INVALID_PARAMETER;
103         }
104
105         return gensec_security->ops->seal_packet(gensec_security, mem_ctx, data, length, whole_pdu, pdu_length, sig);
106 }
107
108 _PUBLIC_ NTSTATUS gensec_sign_packet(struct gensec_security *gensec_security,
109                             TALLOC_CTX *mem_ctx,
110                             const uint8_t *data, size_t length,
111                             const uint8_t *whole_pdu, size_t pdu_length,
112                             DATA_BLOB *sig)
113 {
114         if (!gensec_security->ops->sign_packet) {
115                 return NT_STATUS_NOT_IMPLEMENTED;
116         }
117         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
118                 return NT_STATUS_INVALID_PARAMETER;
119         }
120
121         return gensec_security->ops->sign_packet(gensec_security, mem_ctx, data, length, whole_pdu, pdu_length, sig);
122 }
123
124 _PUBLIC_ size_t gensec_sig_size(struct gensec_security *gensec_security, size_t data_size)
125 {
126         if (!gensec_security->ops->sig_size) {
127                 return 0;
128         }
129         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
130                 return 0;
131         }
132         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
133                 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_DCE_STYLE)) {
134                         return 0;
135                 }
136         }
137
138         return gensec_security->ops->sig_size(gensec_security, data_size);
139 }
140
141 _PUBLIC_ size_t gensec_max_wrapped_size(struct gensec_security *gensec_security)
142 {
143         if (!gensec_security->ops->max_wrapped_size) {
144                 return (1 << 17);
145         }
146
147         return gensec_security->ops->max_wrapped_size(gensec_security);
148 }
149
150 _PUBLIC_ size_t gensec_max_input_size(struct gensec_security *gensec_security)
151 {
152         if (!gensec_security->ops->max_input_size) {
153                 return (1 << 17) - gensec_sig_size(gensec_security, 1 << 17);
154         }
155
156         return gensec_security->ops->max_input_size(gensec_security);
157 }
158
159 _PUBLIC_ NTSTATUS gensec_wrap(struct gensec_security *gensec_security,
160                      TALLOC_CTX *mem_ctx,
161                      const DATA_BLOB *in,
162                      DATA_BLOB *out)
163 {
164         if (!gensec_security->ops->wrap) {
165                 return NT_STATUS_NOT_IMPLEMENTED;
166         }
167         return gensec_security->ops->wrap(gensec_security, mem_ctx, in, out);
168 }
169
170 _PUBLIC_ NTSTATUS gensec_unwrap(struct gensec_security *gensec_security,
171                        TALLOC_CTX *mem_ctx,
172                        const DATA_BLOB *in,
173                        DATA_BLOB *out)
174 {
175         if (!gensec_security->ops->unwrap) {
176                 return NT_STATUS_NOT_IMPLEMENTED;
177         }
178         return gensec_security->ops->unwrap(gensec_security, mem_ctx, in, out);
179 }
180
181 _PUBLIC_ NTSTATUS gensec_session_key(struct gensec_security *gensec_security,
182                                      TALLOC_CTX *mem_ctx,
183                                      DATA_BLOB *session_key)
184 {
185         if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SESSION_KEY)) {
186                 return NT_STATUS_NO_USER_SESSION_KEY;
187         }
188
189         if (!gensec_security->ops->session_key) {
190                 return NT_STATUS_NOT_IMPLEMENTED;
191         }
192
193         return gensec_security->ops->session_key(gensec_security, mem_ctx, session_key);
194 }
195
196 const char *gensec_final_auth_type(struct gensec_security *gensec_security)
197 {
198         if (!gensec_security->ops->final_auth_type) {
199                 return gensec_security->ops->name;
200         }
201
202         return gensec_security->ops->final_auth_type(gensec_security);
203 }
204
205 /*
206  * Log details of a successful GENSEC authorization to a service.
207  *
208  * Only successful authorizations are logged, as only these call gensec_session_info()
209  *
210  * The service may later refuse authorization due to an ACL.
211  *
212  */
213 static void log_successful_gensec_authz_event(struct gensec_security *gensec_security,
214                                               struct auth_session_info *session_info)
215 {
216         const struct tsocket_address *remote
217                 = gensec_get_remote_address(gensec_security);
218         const struct tsocket_address *local
219                 = gensec_get_local_address(gensec_security);
220         const char *service_description
221                 = gensec_get_target_service_description(gensec_security);
222         const char *final_auth_type
223                 = gensec_final_auth_type(gensec_security);
224         const char *transport_protection = NULL;
225         if (gensec_security->want_features & GENSEC_FEATURE_SMB_TRANSPORT) {
226                 transport_protection = AUTHZ_TRANSPORT_PROTECTION_SMB;
227         } else if (gensec_security->want_features & GENSEC_FEATURE_LDAPS_TRANSPORT) {
228                 transport_protection = AUTHZ_TRANSPORT_PROTECTION_TLS;
229         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
230                 transport_protection = AUTHZ_TRANSPORT_PROTECTION_SEAL;
231         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
232                 transport_protection = AUTHZ_TRANSPORT_PROTECTION_SIGN;
233         } else {
234                 transport_protection = AUTHZ_TRANSPORT_PROTECTION_NONE;
235         }
236         log_successful_authz_event(gensec_security->auth_context->msg_ctx,
237                                    gensec_security->auth_context->lp_ctx,
238                                    remote, local,
239                                    service_description,
240                                    final_auth_type,
241                                    transport_protection,
242                                    session_info);
243 }
244
245
246 /**
247  * Return the credentials of a logged on user, including session keys
248  * etc.
249  *
250  * Only valid after a successful authentication
251  *
252  * May only be called once per authentication.  This will also make an
253  * authorization log entry, as it is already called by all the
254  * callers.
255  *
256  */
257
258 _PUBLIC_ NTSTATUS gensec_session_info(struct gensec_security *gensec_security,
259                                       TALLOC_CTX *mem_ctx,
260                                       struct auth_session_info **session_info)
261 {
262         NTSTATUS status;
263         if (!gensec_security->ops->session_info) {
264                 return NT_STATUS_NOT_IMPLEMENTED;
265         }
266         status = gensec_security->ops->session_info(gensec_security, mem_ctx, session_info);
267
268         if (NT_STATUS_IS_OK(status) && !gensec_security->subcontext
269             && (gensec_security->want_features & GENSEC_FEATURE_NO_AUTHZ_LOG) == 0) {
270                 log_successful_gensec_authz_event(gensec_security, *session_info);
271         }
272
273         return status;
274 }
275
276 _PUBLIC_ void gensec_set_max_update_size(struct gensec_security *gensec_security,
277                                 uint32_t max_update_size)
278 {
279         gensec_security->max_update_size = max_update_size;
280 }
281
282 _PUBLIC_ size_t gensec_max_update_size(struct gensec_security *gensec_security)
283 {
284         if (gensec_security->max_update_size == 0) {
285                 return UINT32_MAX;
286         }
287
288         return gensec_security->max_update_size;
289 }
290
291 static NTSTATUS gensec_verify_features(struct gensec_security *gensec_security)
292 {
293         /*
294          * gensec_want_feature(GENSEC_FEATURE_SIGN)
295          * and
296          * gensec_want_feature(GENSEC_FEATURE_SEAL)
297          * require these flags to be available.
298          */
299         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
300                 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
301                         DEBUG(0,("Did not manage to negotiate mandatory feature "
302                                  "SIGN\n"));
303                         return NT_STATUS_ACCESS_DENIED;
304                 }
305         }
306         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
307                 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
308                         DEBUG(0,("Did not manage to negotiate mandatory feature "
309                                  "SEAL\n"));
310                         return NT_STATUS_ACCESS_DENIED;
311                 }
312                 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
313                         DEBUG(0,("Did not manage to negotiate mandatory feature "
314                                  "SIGN for SEAL\n"));
315                         return NT_STATUS_ACCESS_DENIED;
316                 }
317         }
318
319         return NT_STATUS_OK;
320 }
321
322 _PUBLIC_ NTSTATUS gensec_update_ev(struct gensec_security *gensec_security,
323                                    TALLOC_CTX *out_mem_ctx,
324                                    struct tevent_context *ev,
325                                    const DATA_BLOB in, DATA_BLOB *out)
326 {
327         NTSTATUS status;
328         TALLOC_CTX *frame = NULL;
329         struct tevent_req *subreq = NULL;
330         bool ok;
331
332         frame = talloc_stackframe();
333
334         if (ev == NULL) {
335                 ev = samba_tevent_context_init(frame);
336                 if (ev == NULL) {
337                         status = NT_STATUS_NO_MEMORY;
338                         goto fail;
339                 }
340
341                 /*
342                  * TODO: remove this hack once the backends
343                  * are fixed.
344                  */
345                 tevent_loop_allow_nesting(ev);
346         }
347
348         subreq = gensec_update_send(frame, ev, gensec_security, in);
349         if (subreq == NULL) {
350                 status = NT_STATUS_NO_MEMORY;
351                 goto fail;
352         }
353         ok = tevent_req_poll_ntstatus(subreq, ev, &status);
354         if (!ok) {
355                 goto fail;
356         }
357         status = gensec_update_recv(subreq, out_mem_ctx, out);
358  fail:
359         TALLOC_FREE(frame);
360         return status;
361 }
362
363 /**
364  * Next state function for the GENSEC state machine
365  *
366  * @param gensec_security GENSEC State
367  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
368  * @param in The request, as a DATA_BLOB
369  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
370  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
371  *                or NT_STATUS_OK if the user is authenticated.
372  */
373
374 _PUBLIC_ NTSTATUS gensec_update(struct gensec_security *gensec_security,
375                                 TALLOC_CTX *out_mem_ctx,
376                                 const DATA_BLOB in, DATA_BLOB *out)
377 {
378         return gensec_update_ev(gensec_security, out_mem_ctx, NULL, in, out);
379 }
380
381 struct gensec_update_state {
382         const struct gensec_security_ops *ops;
383         struct gensec_security *gensec_security;
384         NTSTATUS status;
385         DATA_BLOB out;
386 };
387
388 static void gensec_update_cleanup(struct tevent_req *req,
389                                   enum tevent_req_state req_state);
390 static void gensec_update_done(struct tevent_req *subreq);
391
392 /**
393  * Next state function for the GENSEC state machine async version
394  *
395  * @param mem_ctx The memory context for the request
396  * @param ev The event context for the request
397  * @param gensec_security GENSEC State
398  * @param in The request, as a DATA_BLOB
399  *
400  * @return The request handle or NULL on no memory failure
401  */
402
403 _PUBLIC_ struct tevent_req *gensec_update_send(TALLOC_CTX *mem_ctx,
404                                                struct tevent_context *ev,
405                                                struct gensec_security *gensec_security,
406                                                const DATA_BLOB in)
407 {
408         struct tevent_req *req = NULL;
409         struct gensec_update_state *state = NULL;
410         struct tevent_req *subreq = NULL;
411
412         req = tevent_req_create(mem_ctx, &state,
413                                 struct gensec_update_state);
414         if (req == NULL) {
415                 return NULL;
416         }
417         state->ops = gensec_security->ops;
418         state->gensec_security = gensec_security;
419
420         if (gensec_security->update_busy_ptr != NULL) {
421                 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
422                 return tevent_req_post(req, ev);
423         }
424
425         if (gensec_security->child_security != NULL) {
426                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
427                 return tevent_req_post(req, ev);
428         }
429
430         gensec_security->update_busy_ptr = &state->gensec_security;
431         tevent_req_set_cleanup_fn(req, gensec_update_cleanup);
432
433         subreq = state->ops->update_send(state, ev, gensec_security, in);
434         if (tevent_req_nomem(subreq, req)) {
435                 return tevent_req_post(req, ev);
436         }
437         tevent_req_set_callback(subreq, gensec_update_done, req);
438
439         DBG_DEBUG("%s[%p]: subreq: %p\n", state->ops->name,
440                   state->gensec_security, subreq);
441
442         return req;
443 }
444
445 static void gensec_update_cleanup(struct tevent_req *req,
446                                   enum tevent_req_state req_state)
447 {
448         struct gensec_update_state *state =
449                 tevent_req_data(req,
450                 struct gensec_update_state);
451
452         if (state->gensec_security == NULL) {
453                 return;
454         }
455
456         if (state->gensec_security->update_busy_ptr == &state->gensec_security) {
457                 state->gensec_security->update_busy_ptr = NULL;
458         }
459
460         state->gensec_security = NULL;
461 }
462
463 static void gensec_update_done(struct tevent_req *subreq)
464 {
465         struct tevent_req *req =
466                 tevent_req_callback_data(subreq,
467                 struct tevent_req);
468         struct gensec_update_state *state =
469                 tevent_req_data(req,
470                 struct gensec_update_state);
471         NTSTATUS status;
472         const char *debug_subreq = NULL;
473
474         if (CHECK_DEBUGLVL(DBGLVL_DEBUG)) {
475                 /*
476                  * We need to call tevent_req_print()
477                  * before calling the _recv function,
478                  * before tevent_req_received() was called.
479                  * in order to print the pointer value of
480                  * the subreq state.
481                  */
482                 debug_subreq = tevent_req_print(state, subreq);
483         }
484
485         status = state->ops->update_recv(subreq, state, &state->out);
486         TALLOC_FREE(subreq);
487         state->status = status;
488         if (GENSEC_UPDATE_IS_NTERROR(status)) {
489                 DBG_INFO("%s[%p]: %s%s%s\n", state->ops->name,
490                          state->gensec_security, nt_errstr(status),
491                          debug_subreq ? " " : "",
492                          debug_subreq ? debug_subreq : "");
493                 tevent_req_nterror(req, status);
494                 return;
495         }
496         DBG_DEBUG("%s[%p]: %s %s\n", state->ops->name,
497                   state->gensec_security, nt_errstr(status),
498                   debug_subreq);
499         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
500                 tevent_req_done(req);
501                 return;
502         }
503
504         /*
505          * Because callers using the
506          * gensec_start_mech_by_authtype() never call
507          * gensec_want_feature(), it isn't sensible for them
508          * to have to call gensec_have_feature() manually, and
509          * these are not points of negotiation, but are
510          * asserted by the client
511          */
512         status = gensec_verify_features(state->gensec_security);
513         if (tevent_req_nterror(req, status)) {
514                 return;
515         }
516
517         tevent_req_done(req);
518 }
519
520 /**
521  * Next state function for the GENSEC state machine
522  *
523  * @param req request state
524  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
525  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
526  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
527  *                or NT_STATUS_OK if the user is authenticated.
528  */
529 _PUBLIC_ NTSTATUS gensec_update_recv(struct tevent_req *req,
530                                      TALLOC_CTX *out_mem_ctx,
531                                      DATA_BLOB *out)
532 {
533         struct gensec_update_state *state =
534                 tevent_req_data(req, struct gensec_update_state);
535         NTSTATUS status;
536
537         *out = data_blob_null;
538
539         if (tevent_req_is_nterror(req, &status)) {
540                 tevent_req_received(req);
541                 return status;
542         }
543
544         *out = state->out;
545         talloc_steal(out_mem_ctx, out->data);
546         status = state->status;
547         tevent_req_received(req);
548         return status;
549 }
550
551 /**
552  * Set the requirement for a certain feature on the connection
553  *
554  */
555
556 _PUBLIC_ void gensec_want_feature(struct gensec_security *gensec_security,
557                          uint32_t feature)
558 {
559         if (!gensec_security->ops || !gensec_security->ops->want_feature) {
560                 gensec_security->want_features |= feature;
561                 return;
562         }
563         gensec_security->ops->want_feature(gensec_security, feature);
564 }
565
566 /**
567  * Check the requirement for a certain feature on the connection
568  *
569  */
570
571 _PUBLIC_ bool gensec_have_feature(struct gensec_security *gensec_security,
572                          uint32_t feature)
573 {
574         if (!gensec_security->ops || !gensec_security->ops->have_feature) {
575                 return false;
576         }
577
578         /* We might 'have' features that we don't 'want', because the
579          * other end demanded them, or we can't neotiate them off */
580         return gensec_security->ops->have_feature(gensec_security, feature);
581 }
582
583 _PUBLIC_ NTTIME gensec_expire_time(struct gensec_security *gensec_security)
584 {
585         if (!gensec_security->ops->expire_time) {
586                 return GENSEC_EXPIRE_TIME_INFINITY;
587         }
588
589         return gensec_security->ops->expire_time(gensec_security);
590 }
591 /**
592  * Return the credentials structure associated with a GENSEC context
593  *
594  */
595
596 _PUBLIC_ struct cli_credentials *gensec_get_credentials(struct gensec_security *gensec_security)
597 {
598         if (!gensec_security) {
599                 return NULL;
600         }
601         return gensec_security->credentials;
602 }
603
604 /**
605  * Set the target service (such as 'http' or 'host') on a GENSEC context - ensures it is talloc()ed
606  *
607  * This is used for Kerberos service principal name resolution.
608  */
609
610 _PUBLIC_ NTSTATUS gensec_set_target_service(struct gensec_security *gensec_security, const char *service)
611 {
612         gensec_security->target.service = talloc_strdup(gensec_security, service);
613         if (!gensec_security->target.service) {
614                 return NT_STATUS_NO_MEMORY;
615         }
616         return NT_STATUS_OK;
617 }
618
619 _PUBLIC_ const char *gensec_get_target_service(struct gensec_security *gensec_security)
620 {
621         if (gensec_security->target.service) {
622                 return gensec_security->target.service;
623         }
624
625         return "host";
626 }
627
628 /**
629  * Set the target service (such as 'samr') on an GENSEC context - ensures it is talloc()ed.
630  *
631  * This is not the Kerberos service principal, instead this is a
632  * constant value that can be logged as part of authentication and
633  * authorization logging
634  */
635 _PUBLIC_ NTSTATUS gensec_set_target_service_description(struct gensec_security *gensec_security,
636                                                         const char *service)
637 {
638         gensec_security->target.service_description = talloc_strdup(gensec_security, service);
639         if (!gensec_security->target.service_description) {
640                 return NT_STATUS_NO_MEMORY;
641         }
642         return NT_STATUS_OK;
643 }
644
645 _PUBLIC_ const char *gensec_get_target_service_description(struct gensec_security *gensec_security)
646 {
647         if (gensec_security->target.service_description) {
648                 return gensec_security->target.service_description;
649         } else if (gensec_security->target.service) {
650                 return gensec_security->target.service;
651         }
652
653         return NULL;
654 }
655
656 /**
657  * Set the target hostname (suitable for kerberos resolutation) on a GENSEC context - ensures it is talloc()ed
658  *
659  */
660
661 _PUBLIC_ NTSTATUS gensec_set_target_hostname(struct gensec_security *gensec_security, const char *hostname)
662 {
663         gensec_security->target.hostname = talloc_strdup(gensec_security, hostname);
664         if (hostname && !gensec_security->target.hostname) {
665                 return NT_STATUS_NO_MEMORY;
666         }
667         return NT_STATUS_OK;
668 }
669
670 _PUBLIC_ const char *gensec_get_target_hostname(struct gensec_security *gensec_security)
671 {
672         /* We allow the target hostname to be overridden for testing purposes */
673         if (gensec_security->settings->target_hostname) {
674                 return gensec_security->settings->target_hostname;
675         }
676
677         if (gensec_security->target.hostname) {
678                 return gensec_security->target.hostname;
679         }
680
681         /* We could add use the 'set sockaddr' call, and do a reverse
682          * lookup, but this would be both insecure (compromising the
683          * way kerberos works) and add DNS timeouts */
684         return NULL;
685 }
686
687 /**
688  * Set (and copy) local and peer socket addresses onto a socket
689  * context on the GENSEC context.
690  *
691  * This is so that kerberos can include these addresses in
692  * cryptographic tokens, to avoid certain attacks.
693  */
694
695 /**
696  * @brief Set the local gensec address.
697  *
698  * @param  gensec_security   The gensec security context to use.
699  *
700  * @param  remote       The local address to set.
701  *
702  * @return              On success NT_STATUS_OK is returned or an NT_STATUS
703  *                      error.
704  */
705 _PUBLIC_ NTSTATUS gensec_set_local_address(struct gensec_security *gensec_security,
706                 const struct tsocket_address *local)
707 {
708         TALLOC_FREE(gensec_security->local_addr);
709
710         if (local == NULL) {
711                 return NT_STATUS_OK;
712         }
713
714         gensec_security->local_addr = tsocket_address_copy(local, gensec_security);
715         if (gensec_security->local_addr == NULL) {
716                 return NT_STATUS_NO_MEMORY;
717         }
718
719         return NT_STATUS_OK;
720 }
721
722 /**
723  * @brief Set the remote gensec address.
724  *
725  * @param  gensec_security   The gensec security context to use.
726  *
727  * @param  remote       The remote address to set.
728  *
729  * @return              On success NT_STATUS_OK is returned or an NT_STATUS
730  *                      error.
731  */
732 _PUBLIC_ NTSTATUS gensec_set_remote_address(struct gensec_security *gensec_security,
733                 const struct tsocket_address *remote)
734 {
735         TALLOC_FREE(gensec_security->remote_addr);
736
737         if (remote == NULL) {
738                 return NT_STATUS_OK;
739         }
740
741         gensec_security->remote_addr = tsocket_address_copy(remote, gensec_security);
742         if (gensec_security->remote_addr == NULL) {
743                 return NT_STATUS_NO_MEMORY;
744         }
745
746         return NT_STATUS_OK;
747 }
748
749 /**
750  * @brief Get the local address from a gensec security context.
751  *
752  * @param  gensec_security   The security context to get the address from.
753  *
754  * @return              The address as tsocket_address which could be NULL if
755  *                      no address is set.
756  */
757 _PUBLIC_ const struct tsocket_address *gensec_get_local_address(struct gensec_security *gensec_security)
758 {
759         if (gensec_security == NULL) {
760                 return NULL;
761         }
762         return gensec_security->local_addr;
763 }
764
765 /**
766  * @brief Get the remote address from a gensec security context.
767  *
768  * @param  gensec_security   The security context to get the address from.
769  *
770  * @return              The address as tsocket_address which could be NULL if
771  *                      no address is set.
772  */
773 _PUBLIC_ const struct tsocket_address *gensec_get_remote_address(struct gensec_security *gensec_security)
774 {
775         if (gensec_security == NULL) {
776                 return NULL;
777         }
778         return gensec_security->remote_addr;
779 }
780
781 /**
782  * Set the target principal (assuming it it known, say from the SPNEGO reply)
783  *  - ensures it is talloc()ed
784  *
785  */
786
787 _PUBLIC_ NTSTATUS gensec_set_target_principal(struct gensec_security *gensec_security, const char *principal)
788 {
789         gensec_security->target.principal = talloc_strdup(gensec_security, principal);
790         if (!gensec_security->target.principal) {
791                 return NT_STATUS_NO_MEMORY;
792         }
793         return NT_STATUS_OK;
794 }
795
796 _PUBLIC_ const char *gensec_get_target_principal(struct gensec_security *gensec_security)
797 {
798         if (gensec_security->target.principal) {
799                 return gensec_security->target.principal;
800         }
801
802         return NULL;
803 }