source: branches/samba-3.5.x/source4/auth/gensec/gensec_krb5.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 27.1 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Kerberos backend for GENSEC
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
7 Copyright (C) Andrew Tridgell 2001
8 Copyright (C) Luke Howard 2002-2003
9 Copyright (C) Stefan Metzmacher 2004-2005
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21
22 You should have received a copy of the GNU General Public License
23 along with this program. If not, see <http://www.gnu.org/licenses/>.
24*/
25
26#include "includes.h"
27#include "system/kerberos.h"
28#include "auth/kerberos/kerberos.h"
29#include "librpc/gen_ndr/krb5pac.h"
30#include "auth/auth.h"
31#include "lib/ldb/include/ldb.h"
32#include "auth/auth_sam.h"
33#include "lib/socket/socket.h"
34#include "librpc/rpc/dcerpc.h"
35#include "auth/credentials/credentials.h"
36#include "auth/credentials/credentials_krb5.h"
37#include "auth/gensec/gensec.h"
38#include "auth/gensec/gensec_proto.h"
39#include "param/param.h"
40#include "auth/session_proto.h"
41#include "auth/auth_sam_reply.h"
42
43enum GENSEC_KRB5_STATE {
44 GENSEC_KRB5_SERVER_START,
45 GENSEC_KRB5_CLIENT_START,
46 GENSEC_KRB5_CLIENT_MUTUAL_AUTH,
47 GENSEC_KRB5_DONE
48};
49
50struct gensec_krb5_state {
51 DATA_BLOB session_key;
52 DATA_BLOB pac;
53 enum GENSEC_KRB5_STATE state_position;
54 struct smb_krb5_context *smb_krb5_context;
55 krb5_auth_context auth_context;
56 krb5_data enc_ticket;
57 krb5_keyblock *keyblock;
58 krb5_ticket *ticket;
59 bool gssapi;
60 krb5_flags ap_req_options;
61};
62
63static int gensec_krb5_destroy(struct gensec_krb5_state *gensec_krb5_state)
64{
65 if (!gensec_krb5_state->smb_krb5_context) {
66 /* We can't clean anything else up unless we started up this far */
67 return 0;
68 }
69 if (gensec_krb5_state->enc_ticket.length) {
70 kerberos_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
71 &gensec_krb5_state->enc_ticket);
72 }
73
74 if (gensec_krb5_state->ticket) {
75 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
76 gensec_krb5_state->ticket);
77 }
78
79 /* ccache freed in a child destructor */
80
81 krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
82 gensec_krb5_state->keyblock);
83
84 if (gensec_krb5_state->auth_context) {
85 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
86 gensec_krb5_state->auth_context);
87 }
88
89 return 0;
90}
91
92static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security, bool gssapi)
93{
94 krb5_error_code ret;
95 struct gensec_krb5_state *gensec_krb5_state;
96 struct cli_credentials *creds;
97 const struct socket_address *my_addr, *peer_addr;
98 krb5_address my_krb5_addr, peer_krb5_addr;
99
100 creds = gensec_get_credentials(gensec_security);
101 if (!creds) {
102 return NT_STATUS_INVALID_PARAMETER;
103 }
104
105 gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
106 if (!gensec_krb5_state) {
107 return NT_STATUS_NO_MEMORY;
108 }
109
110 gensec_security->private_data = gensec_krb5_state;
111 gensec_krb5_state->smb_krb5_context = NULL;
112 gensec_krb5_state->auth_context = NULL;
113 gensec_krb5_state->ticket = NULL;
114 ZERO_STRUCT(gensec_krb5_state->enc_ticket);
115 gensec_krb5_state->keyblock = NULL;
116 gensec_krb5_state->session_key = data_blob(NULL, 0);
117 gensec_krb5_state->pac = data_blob(NULL, 0);
118 gensec_krb5_state->gssapi = gssapi;
119
120 talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
121
122 if (cli_credentials_get_krb5_context(creds,
123 gensec_security->event_ctx,
124 gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
125 talloc_free(gensec_krb5_state);
126 return NT_STATUS_INTERNAL_ERROR;
127 }
128
129 ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
130 if (ret) {
131 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
132 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
133 ret, gensec_krb5_state)));
134 talloc_free(gensec_krb5_state);
135 return NT_STATUS_INTERNAL_ERROR;
136 }
137
138 ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
139 gensec_krb5_state->auth_context,
140 KRB5_AUTH_CONTEXT_DO_SEQUENCE);
141 if (ret) {
142 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
143 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
144 ret, gensec_krb5_state)));
145 talloc_free(gensec_krb5_state);
146 return NT_STATUS_INTERNAL_ERROR;
147 }
148
149 my_addr = gensec_get_my_addr(gensec_security);
150 if (my_addr && my_addr->sockaddr) {
151 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
152 my_addr->sockaddr, &my_krb5_addr);
153 if (ret) {
154 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
155 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
156 ret, gensec_krb5_state)));
157 talloc_free(gensec_krb5_state);
158 return NT_STATUS_INTERNAL_ERROR;
159 }
160 }
161
162 peer_addr = gensec_get_peer_addr(gensec_security);
163 if (peer_addr && peer_addr->sockaddr) {
164 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
165 peer_addr->sockaddr, &peer_krb5_addr);
166 if (ret) {
167 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
168 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
169 ret, gensec_krb5_state)));
170 talloc_free(gensec_krb5_state);
171 return NT_STATUS_INTERNAL_ERROR;
172 }
173 }
174
175 ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
176 gensec_krb5_state->auth_context,
177 my_addr ? &my_krb5_addr : NULL,
178 peer_addr ? &peer_krb5_addr : NULL);
179 if (ret) {
180 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
181 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
182 ret, gensec_krb5_state)));
183 talloc_free(gensec_krb5_state);
184 return NT_STATUS_INTERNAL_ERROR;
185 }
186
187 return NT_STATUS_OK;
188}
189
190static NTSTATUS gensec_krb5_common_server_start(struct gensec_security *gensec_security, bool gssapi)
191{
192 NTSTATUS nt_status;
193 struct gensec_krb5_state *gensec_krb5_state;
194
195 nt_status = gensec_krb5_start(gensec_security, gssapi);
196 if (!NT_STATUS_IS_OK(nt_status)) {
197 return nt_status;
198 }
199
200 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
201 gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
202
203 return NT_STATUS_OK;
204}
205
206static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
207{
208 return gensec_krb5_common_server_start(gensec_security, false);
209}
210
211static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
212{
213 return gensec_krb5_common_server_start(gensec_security, true);
214}
215
216static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
217{
218 struct gensec_krb5_state *gensec_krb5_state;
219 krb5_error_code ret;
220 NTSTATUS nt_status;
221 struct ccache_container *ccache_container;
222 const char *hostname;
223
224 const char *principal;
225 krb5_data in_data;
226
227 hostname = gensec_get_target_hostname(gensec_security);
228 if (!hostname) {
229 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
230 return NT_STATUS_INVALID_PARAMETER;
231 }
232 if (is_ipaddress(hostname)) {
233 DEBUG(2, ("Cannot do krb5 to an IP address"));
234 return NT_STATUS_INVALID_PARAMETER;
235 }
236 if (strcmp(hostname, "localhost") == 0) {
237 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
238 return NT_STATUS_INVALID_PARAMETER;
239 }
240
241 nt_status = gensec_krb5_start(gensec_security, gssapi);
242 if (!NT_STATUS_IS_OK(nt_status)) {
243 return nt_status;
244 }
245
246 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
247 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
248 gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
249
250 if (gensec_krb5_state->gssapi) {
251 /* The Fake GSSAPI modal emulates Samba3, which does not do mutual authentication */
252 if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
253 gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
254 }
255 } else {
256 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
257 if (gensec_setting_bool(gensec_security->settings, "gensec_krb5", "mutual", true)) {
258 gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
259 }
260 }
261
262 principal = gensec_get_target_principal(gensec_security);
263
264 ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
265 gensec_security->event_ctx,
266 gensec_security->settings->lp_ctx, &ccache_container);
267 switch (ret) {
268 case 0:
269 break;
270 case KRB5KDC_ERR_PREAUTH_FAILED:
271 return NT_STATUS_LOGON_FAILURE;
272 case KRB5_KDC_UNREACH:
273 DEBUG(3, ("Cannot reach a KDC we require to contact %s\n", principal));
274 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
275 default:
276 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_message(ret)));
277 return NT_STATUS_UNSUCCESSFUL;
278 }
279 in_data.length = 0;
280
281 if (principal && lp_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
282 krb5_principal target_principal;
283 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
284 &target_principal);
285 if (ret == 0) {
286 ret = krb5_mk_req_exact(gensec_krb5_state->smb_krb5_context->krb5_context,
287 &gensec_krb5_state->auth_context,
288 gensec_krb5_state->ap_req_options,
289 target_principal,
290 &in_data, ccache_container->ccache,
291 &gensec_krb5_state->enc_ticket);
292 krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
293 target_principal);
294 }
295 } else {
296 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
297 &gensec_krb5_state->auth_context,
298 gensec_krb5_state->ap_req_options,
299 gensec_get_target_service(gensec_security),
300 hostname,
301 &in_data, ccache_container->ccache,
302 &gensec_krb5_state->enc_ticket);
303 }
304 switch (ret) {
305 case 0:
306 return NT_STATUS_OK;
307 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
308 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
309 hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
310 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
311 case KRB5_KDC_UNREACH:
312 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
313 hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
314 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
315 case KRB5KDC_ERR_PREAUTH_FAILED:
316 case KRB5KRB_AP_ERR_TKT_EXPIRED:
317 case KRB5_CC_END:
318 /* Too much clock skew - we will need to kinit to re-skew the clock */
319 case KRB5KRB_AP_ERR_SKEW:
320 case KRB5_KDCREP_SKEW:
321 {
322 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
323 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
324 /*fall through*/
325 }
326
327 /* just don't print a message for these really ordinary messages */
328 case KRB5_FCC_NOFILE:
329 case KRB5_CC_NOTFOUND:
330 case ENOENT:
331
332 return NT_STATUS_UNSUCCESSFUL;
333 break;
334
335 default:
336 DEBUG(0, ("kerberos: %s\n",
337 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
338 return NT_STATUS_UNSUCCESSFUL;
339 }
340}
341
342static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
343{
344 return gensec_krb5_common_client_start(gensec_security, false);
345}
346
347static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
348{
349 return gensec_krb5_common_client_start(gensec_security, true);
350}
351
352/**
353 * Check if the packet is one for this mechansim
354 *
355 * @param gensec_security GENSEC state
356 * @param in The request, as a DATA_BLOB
357 * @return Error, INVALID_PARAMETER if it's not a packet for us
358 * or NT_STATUS_OK if the packet is ok.
359 */
360
361static NTSTATUS gensec_fake_gssapi_krb5_magic(struct gensec_security *gensec_security,
362 const DATA_BLOB *in)
363{
364 if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
365 return NT_STATUS_OK;
366 } else {
367 return NT_STATUS_INVALID_PARAMETER;
368 }
369}
370
371
372/**
373 * Next state function for the Krb5 GENSEC mechanism
374 *
375 * @param gensec_krb5_state KRB5 State
376 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
377 * @param in The request, as a DATA_BLOB
378 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
379 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
380 * or NT_STATUS_OK if the user is authenticated.
381 */
382
383static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
384 TALLOC_CTX *out_mem_ctx,
385 const DATA_BLOB in, DATA_BLOB *out)
386{
387 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
388 krb5_error_code ret = 0;
389 NTSTATUS nt_status;
390
391 switch (gensec_krb5_state->state_position) {
392 case GENSEC_KRB5_CLIENT_START:
393 {
394 DATA_BLOB unwrapped_out;
395
396 if (gensec_krb5_state->gssapi) {
397 unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
398
399 /* wrap that up in a nice GSS-API wrapping */
400 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
401 } else {
402 *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
403 }
404 if (gensec_krb5_state->ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
405 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
406 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
407 } else {
408 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
409 nt_status = NT_STATUS_OK;
410 }
411 return nt_status;
412 }
413
414 case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
415 {
416 DATA_BLOB unwrapped_in;
417 krb5_data inbuf;
418 krb5_ap_rep_enc_part *repl = NULL;
419 uint8_t tok_id[2];
420
421 if (gensec_krb5_state->gssapi) {
422 if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
423 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
424 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
425 return NT_STATUS_INVALID_PARAMETER;
426 }
427 } else {
428 unwrapped_in = in;
429 }
430 /* TODO: check the tok_id */
431
432 inbuf.data = unwrapped_in.data;
433 inbuf.length = unwrapped_in.length;
434 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
435 gensec_krb5_state->auth_context,
436 &inbuf, &repl);
437 if (ret) {
438 DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
439 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
440 dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf.data, inbuf.length);
441 nt_status = NT_STATUS_ACCESS_DENIED;
442 } else {
443 *out = data_blob(NULL, 0);
444 nt_status = NT_STATUS_OK;
445 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
446 }
447 if (repl) {
448 krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
449 }
450 return nt_status;
451 }
452
453 case GENSEC_KRB5_SERVER_START:
454 {
455 DATA_BLOB unwrapped_in;
456 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
457 krb5_data inbuf, outbuf;
458 uint8_t tok_id[2];
459 struct keytab_container *keytab;
460 krb5_principal server_in_keytab;
461
462 if (!in.data) {
463 return NT_STATUS_INVALID_PARAMETER;
464 }
465
466 /* Grab the keytab, however generated */
467 ret = cli_credentials_get_keytab(gensec_get_credentials(gensec_security),
468 gensec_security->event_ctx,
469 gensec_security->settings->lp_ctx, &keytab);
470 if (ret) {
471 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
472 }
473
474 /* This ensures we lookup the correct entry in that keytab */
475 ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
476 gensec_krb5_state->smb_krb5_context,
477 &server_in_keytab);
478
479 if (ret) {
480 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
481 }
482
483 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
484 if (gensec_krb5_state->gssapi
485 && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
486 inbuf.data = unwrapped_in.data;
487 inbuf.length = unwrapped_in.length;
488 } else {
489 inbuf.data = in.data;
490 inbuf.length = in.length;
491 }
492
493 ret = smb_rd_req_return_stuff(gensec_krb5_state->smb_krb5_context->krb5_context,
494 &gensec_krb5_state->auth_context,
495 &inbuf, keytab->keytab, server_in_keytab,
496 &outbuf,
497 &gensec_krb5_state->ticket,
498 &gensec_krb5_state->keyblock);
499
500 if (ret) {
501 return NT_STATUS_LOGON_FAILURE;
502 }
503 unwrapped_out.data = (uint8_t *)outbuf.data;
504 unwrapped_out.length = outbuf.length;
505 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
506 /* wrap that up in a nice GSS-API wrapping */
507 if (gensec_krb5_state->gssapi) {
508 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
509 } else {
510 *out = data_blob_talloc(out_mem_ctx, outbuf.data, outbuf.length);
511 }
512 krb5_data_free(&outbuf);
513 return NT_STATUS_OK;
514 }
515
516 case GENSEC_KRB5_DONE:
517 default:
518 /* Asking too many times... */
519 return NT_STATUS_INVALID_PARAMETER;
520 }
521}
522
523static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
524 DATA_BLOB *session_key)
525{
526 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
527 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
528 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
529 krb5_keyblock *skey;
530 krb5_error_code err = -1;
531
532 if (gensec_krb5_state->state_position != GENSEC_KRB5_DONE) {
533 return NT_STATUS_NO_USER_SESSION_KEY;
534 }
535
536 if (gensec_krb5_state->session_key.data) {
537 *session_key = gensec_krb5_state->session_key;
538 return NT_STATUS_OK;
539 }
540
541 switch (gensec_security->gensec_role) {
542 case GENSEC_CLIENT:
543 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
544 break;
545 case GENSEC_SERVER:
546 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
547 break;
548 }
549 if (err == 0 && skey != NULL) {
550 DEBUG(10, ("Got KRB5 session key of length %d\n",
551 (int)KRB5_KEY_LENGTH(skey)));
552 gensec_krb5_state->session_key = data_blob_talloc(gensec_krb5_state,
553 KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
554 *session_key = gensec_krb5_state->session_key;
555 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
556
557 krb5_free_keyblock(context, skey);
558 return NT_STATUS_OK;
559 } else {
560 DEBUG(10, ("KRB5 error getting session key %d\n", err));
561 return NT_STATUS_NO_USER_SESSION_KEY;
562 }
563}
564
565static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
566 struct auth_session_info **_session_info)
567{
568 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
569 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
570 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
571 struct auth_serversupplied_info *server_info = NULL;
572 struct auth_session_info *session_info = NULL;
573 struct PAC_LOGON_INFO *logon_info;
574
575 krb5_principal client_principal;
576 char *principal_string;
577
578 DATA_BLOB pac;
579 krb5_data pac_data;
580
581 krb5_error_code ret;
582
583 TALLOC_CTX *mem_ctx = talloc_new(gensec_security);
584 if (!mem_ctx) {
585 return NT_STATUS_NO_MEMORY;
586 }
587
588 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
589 if (ret) {
590 DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
591 smb_get_krb5_error_message(context,
592 ret, mem_ctx)));
593 talloc_free(mem_ctx);
594 return NT_STATUS_NO_MEMORY;
595 }
596
597 ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
598 client_principal, &principal_string);
599 if (ret) {
600 DEBUG(1, ("Unable to parse client principal: %s\n",
601 smb_get_krb5_error_message(context,
602 ret, mem_ctx)));
603 talloc_free(mem_ctx);
604 return NT_STATUS_NO_MEMORY;
605 }
606
607 ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
608 KRB5_AUTHDATA_WIN2K_PAC,
609 &pac_data);
610
611 if (ret && gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
612 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s \n",
613 principal_string,
614 smb_get_krb5_error_message(context,
615 ret, mem_ctx)));
616 krb5_free_principal(context, client_principal);
617 free(principal_string);
618 return NT_STATUS_ACCESS_DENIED;
619 } else if (ret) {
620 /* NO pac */
621 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
622 smb_get_krb5_error_message(context,
623 ret, mem_ctx)));
624 if (gensec_security->auth_context &&
625 !gensec_setting_bool(gensec_security->settings, "gensec", "require_pac", false)) {
626 DEBUG(1, ("Unable to find PAC for %s, resorting to local user lookup: %s",
627 principal_string, smb_get_krb5_error_message(context,
628 ret, mem_ctx)));
629 nt_status = gensec_security->auth_context->get_server_info_principal(mem_ctx,
630 gensec_security->auth_context,
631 principal_string,
632 &server_info);
633 if (!NT_STATUS_IS_OK(nt_status)) {
634 talloc_free(mem_ctx);
635 return nt_status;
636 }
637 } else {
638 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access\n",
639 principal_string));
640 return NT_STATUS_ACCESS_DENIED;
641 }
642
643 krb5_free_principal(context, client_principal);
644 free(principal_string);
645
646 if (!NT_STATUS_IS_OK(nt_status)) {
647 talloc_free(mem_ctx);
648 return nt_status;
649 }
650 } else {
651 /* Found pac */
652 union netr_Validation validation;
653 free(principal_string);
654
655 pac = data_blob_talloc(mem_ctx, pac_data.data, pac_data.length);
656 if (!pac.data) {
657 krb5_free_principal(context, client_principal);
658 talloc_free(mem_ctx);
659 return NT_STATUS_NO_MEMORY;
660 }
661
662 /* decode and verify the pac */
663 nt_status = kerberos_pac_logon_info(gensec_krb5_state,
664 gensec_security->settings->iconv_convenience,
665 &logon_info, pac,
666 gensec_krb5_state->smb_krb5_context->krb5_context,
667 NULL, gensec_krb5_state->keyblock,
668 client_principal,
669 gensec_krb5_state->ticket->ticket.authtime, NULL);
670 krb5_free_principal(context, client_principal);
671
672 if (!NT_STATUS_IS_OK(nt_status)) {
673 talloc_free(mem_ctx);
674 return nt_status;
675 }
676
677 validation.sam3 = &logon_info->info3;
678 nt_status = make_server_info_netlogon_validation(mem_ctx,
679 NULL,
680 3, &validation,
681 &server_info);
682 if (!NT_STATUS_IS_OK(nt_status)) {
683 talloc_free(mem_ctx);
684 return nt_status;
685 }
686 }
687
688 /* references the server_info into the session_info */
689 nt_status = auth_generate_session_info(mem_ctx, gensec_security->event_ctx, gensec_security->settings->lp_ctx, server_info, &session_info);
690
691 if (!NT_STATUS_IS_OK(nt_status)) {
692 talloc_free(mem_ctx);
693 return nt_status;
694 }
695
696 nt_status = gensec_krb5_session_key(gensec_security, &session_info->session_key);
697
698 if (!NT_STATUS_IS_OK(nt_status)) {
699 talloc_free(mem_ctx);
700 return nt_status;
701 }
702
703 *_session_info = session_info;
704
705 talloc_steal(gensec_krb5_state, session_info);
706 talloc_free(mem_ctx);
707 return NT_STATUS_OK;
708}
709
710static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
711 TALLOC_CTX *mem_ctx,
712 const DATA_BLOB *in,
713 DATA_BLOB *out)
714{
715 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
716 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
717 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
718 krb5_error_code ret;
719 krb5_data input, output;
720 input.length = in->length;
721 input.data = in->data;
722
723 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
724 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
725 if (ret) {
726 DEBUG(1, ("krb5_mk_priv failed: %s\n",
727 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
728 ret, mem_ctx)));
729 return NT_STATUS_ACCESS_DENIED;
730 }
731 *out = data_blob_talloc(mem_ctx, output.data, output.length);
732
733 krb5_data_free(&output);
734 } else {
735 return NT_STATUS_ACCESS_DENIED;
736 }
737 return NT_STATUS_OK;
738}
739
740static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
741 TALLOC_CTX *mem_ctx,
742 const DATA_BLOB *in,
743 DATA_BLOB *out)
744{
745 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
746 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
747 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
748 krb5_error_code ret;
749 krb5_data input, output;
750 krb5_replay_data replay;
751 input.length = in->length;
752 input.data = in->data;
753
754 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
755 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
756 if (ret) {
757 DEBUG(1, ("krb5_rd_priv failed: %s\n",
758 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
759 ret, mem_ctx)));
760 return NT_STATUS_ACCESS_DENIED;
761 }
762 *out = data_blob_talloc(mem_ctx, output.data, output.length);
763
764 krb5_data_free(&output);
765 } else {
766 return NT_STATUS_ACCESS_DENIED;
767 }
768 return NT_STATUS_OK;
769}
770
771static bool gensec_krb5_have_feature(struct gensec_security *gensec_security,
772 uint32_t feature)
773{
774 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
775 if (feature & GENSEC_FEATURE_SESSION_KEY) {
776 return true;
777 }
778 if (!gensec_krb5_state->gssapi &&
779 (feature & GENSEC_FEATURE_SEAL)) {
780 return true;
781 }
782
783 return false;
784}
785
786static const char *gensec_krb5_oids[] = {
787 GENSEC_OID_KERBEROS5,
788 GENSEC_OID_KERBEROS5_OLD,
789 NULL
790};
791
792static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
793 .name = "fake_gssapi_krb5",
794 .auth_type = DCERPC_AUTH_TYPE_KRB5,
795 .oid = gensec_krb5_oids,
796 .client_start = gensec_fake_gssapi_krb5_client_start,
797 .server_start = gensec_fake_gssapi_krb5_server_start,
798 .update = gensec_krb5_update,
799 .magic = gensec_fake_gssapi_krb5_magic,
800 .session_key = gensec_krb5_session_key,
801 .session_info = gensec_krb5_session_info,
802 .have_feature = gensec_krb5_have_feature,
803 .enabled = false,
804 .kerberos = true,
805 .priority = GENSEC_KRB5
806};
807
808static const struct gensec_security_ops gensec_krb5_security_ops = {
809 .name = "krb5",
810 .client_start = gensec_krb5_client_start,
811 .server_start = gensec_krb5_server_start,
812 .update = gensec_krb5_update,
813 .session_key = gensec_krb5_session_key,
814 .session_info = gensec_krb5_session_info,
815 .have_feature = gensec_krb5_have_feature,
816 .wrap = gensec_krb5_wrap,
817 .unwrap = gensec_krb5_unwrap,
818 .enabled = true,
819 .kerberos = true,
820 .priority = GENSEC_KRB5
821};
822
823_PUBLIC_ NTSTATUS gensec_krb5_init(void)
824{
825 NTSTATUS ret;
826
827 ret = gensec_register(&gensec_krb5_security_ops);
828 if (!NT_STATUS_IS_OK(ret)) {
829 DEBUG(0,("Failed to register '%s' gensec backend!\n",
830 gensec_krb5_security_ops.name));
831 return ret;
832 }
833
834 ret = gensec_register(&gensec_fake_gssapi_krb5_security_ops);
835 if (!NT_STATUS_IS_OK(ret)) {
836 DEBUG(0,("Failed to register '%s' gensec backend!\n",
837 gensec_krb5_security_ops.name));
838 return ret;
839 }
840
841 return ret;
842}
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