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