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kerberos: Map KRB5KDC_ERR_CLIENT_REVOKED to NT_STATUS_ACCOUNT_LOCKED_OUT
[Samba.git] / source4 / auth / gensec / gensec_gssapi.c
blob63fda1f807d26c722c973cccc17dc1f1acd4cb50
1 /*
2 Unix SMB/CIFS implementation.
3
4 Kerberos backend for GENSEC
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
7 Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
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
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "lib/events/events.h"
26 #include "system/kerberos.h"
27 #include "system/gssapi.h"
28 #include "auth/kerberos/kerberos.h"
29 #include "librpc/gen_ndr/krb5pac.h"
30 #include "auth/auth.h"
31 #include <ldb.h>
32 #include "auth/auth_sam.h"
33 #include "librpc/gen_ndr/dcerpc.h"
34 #include "auth/credentials/credentials.h"
35 #include "auth/credentials/credentials_krb5.h"
36 #include "auth/gensec/gensec.h"
37 #include "auth/gensec/gensec_internal.h"
38 #include "auth/gensec/gensec_proto.h"
39 #include "auth/gensec/gensec_toplevel_proto.h"
40 #include "param/param.h"
41 #include "auth/session_proto.h"
42 #include "gensec_gssapi.h"
43 #include "lib/util/util_net.h"
44 #include "auth/kerberos/pac_utils.h"
45
46 #ifndef gss_mech_spnego
47 gss_OID_desc spnego_mech_oid_desc =
48 { 6, discard_const_p(void, "\x2b\x06\x01\x05\x05\x02") };
49 #define gss_mech_spnego (&spnego_mech_oid_desc)
50 #endif
51
52 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
53
54 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
55 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
56
57 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
58 {
59 OM_uint32 maj_stat, min_stat;
60
61 if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
62 maj_stat = gss_release_cred(&min_stat,
63 &gensec_gssapi_state->delegated_cred_handle);
64 }
65
66 if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
67 maj_stat = gss_delete_sec_context (&min_stat,
68 &gensec_gssapi_state->gssapi_context,
69 GSS_C_NO_BUFFER);
70 }
71
72 if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
73 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
74 }
75 if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
76 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
77 }
78
79 if (gensec_gssapi_state->lucid) {
80 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
81 }
82
83 return 0;
84 }
85
86 static NTSTATUS gensec_gssapi_init_lucid(struct gensec_gssapi_state *gensec_gssapi_state)
87 {
88 OM_uint32 maj_stat, min_stat;
89
90 if (gensec_gssapi_state->lucid) {
91 return NT_STATUS_OK;
92 }
93
94 maj_stat = gss_krb5_export_lucid_sec_context(&min_stat,
95 &gensec_gssapi_state->gssapi_context,
96 1,
97 (void **)&gensec_gssapi_state->lucid);
98 if (maj_stat != GSS_S_COMPLETE) {
99 DEBUG(0,("gensec_gssapi_init_lucid: %s\n",
100 gssapi_error_string(gensec_gssapi_state,
101 maj_stat, min_stat,
102 gensec_gssapi_state->gss_oid)));
103 return NT_STATUS_INTERNAL_ERROR;
104 }
105
106 if (gensec_gssapi_state->lucid->version != 1) {
107 DEBUG(0,("gensec_gssapi_init_lucid: lucid version[%d] != 1\n",
108 gensec_gssapi_state->lucid->version));
109 gss_krb5_free_lucid_sec_context(&min_stat, gensec_gssapi_state->lucid);
110 gensec_gssapi_state->lucid = NULL;
111 return NT_STATUS_INTERNAL_ERROR;
112 }
113
114 return NT_STATUS_OK;
115 }
116
117 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
118 {
119 struct gensec_gssapi_state *gensec_gssapi_state;
120 krb5_error_code ret;
121 const char *realm;
122
123 gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
124 if (!gensec_gssapi_state) {
125 return NT_STATUS_NO_MEMORY;
126 }
127
128 gensec_security->private_data = gensec_gssapi_state;
129
130 gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
131
132 /* TODO: Fill in channel bindings */
133 gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
134
135 gensec_gssapi_state->server_name = GSS_C_NO_NAME;
136 gensec_gssapi_state->client_name = GSS_C_NO_NAME;
137
138 gensec_gssapi_state->gss_want_flags = 0;
139 gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
140
141 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
142 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
143 }
144 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
145 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
146 }
147 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
148 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
149 }
150 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
151 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
152 }
153 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
154 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
155 }
156
157 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
158 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
159 }
160 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
161 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
162 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
163 }
164 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
165 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
166 }
167
168 gensec_gssapi_state->gss_got_flags = 0;
169
170 switch (gensec_security->ops->auth_type) {
171 case DCERPC_AUTH_TYPE_SPNEGO:
172 gensec_gssapi_state->gss_oid = gss_mech_spnego;
173 break;
174 case DCERPC_AUTH_TYPE_KRB5:
175 default:
176 gensec_gssapi_state->gss_oid =
177 discard_const_p(void, gss_mech_krb5);
178 break;
179 }
180
181 ret = smb_krb5_init_context(gensec_gssapi_state,
182 NULL,
183 gensec_security->settings->lp_ctx,
184 &gensec_gssapi_state->smb_krb5_context);
185 if (ret) {
186 DEBUG(1,("gensec_gssapi_start: smb_krb5_init_context failed (%s)\n",
187 error_message(ret)));
188 talloc_free(gensec_gssapi_state);
189 return NT_STATUS_INTERNAL_ERROR;
190 }
191
192 gensec_gssapi_state->client_cred = NULL;
193 gensec_gssapi_state->server_cred = NULL;
194
195 gensec_gssapi_state->lucid = NULL;
196
197 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
198
199 gensec_gssapi_state->sasl = false;
200 gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
201 gensec_gssapi_state->sasl_protection = 0;
202
203 gensec_gssapi_state->max_wrap_buf_size
204 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
205 gensec_gssapi_state->gss_exchange_count = 0;
206 gensec_gssapi_state->sig_size = 0;
207
208 talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
209
210 #ifdef SAMBA4_USES_HEIMDAL
211 realm = lpcfg_realm(gensec_security->settings->lp_ctx);
212 if (realm != NULL) {
213 ret = gsskrb5_set_default_realm(realm);
214 if (ret) {
215 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_default_realm failed\n"));
216 talloc_free(gensec_gssapi_state);
217 return NT_STATUS_INTERNAL_ERROR;
218 }
219 }
220
221 /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
222 ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
223 if (ret) {
224 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_dns_canonicalize failed\n"));
225 talloc_free(gensec_gssapi_state);
226 return NT_STATUS_INTERNAL_ERROR;
227 }
228 #endif
229 return NT_STATUS_OK;
230 }
231
232 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
233 {
234 NTSTATUS nt_status;
235 int ret;
236 struct gensec_gssapi_state *gensec_gssapi_state;
237 struct cli_credentials *machine_account;
238 struct gssapi_creds_container *gcc;
239
240 nt_status = gensec_gssapi_start(gensec_security);
241 if (!NT_STATUS_IS_OK(nt_status)) {
242 return nt_status;
243 }
244
245 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
246
247 machine_account = gensec_get_credentials(gensec_security);
248
249 if (!machine_account) {
250 DEBUG(3, ("No machine account credentials specified\n"));
251 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
252 } else {
253 ret = cli_credentials_get_server_gss_creds(machine_account,
254 gensec_security->settings->lp_ctx, &gcc);
255 if (ret) {
256 DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
257 error_message(ret)));
258 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
259 }
260 }
261
262 gensec_gssapi_state->server_cred = gcc;
263 return NT_STATUS_OK;
264
265 }
266
267 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
268 {
269 NTSTATUS nt_status;
270 struct gensec_gssapi_state *gensec_gssapi_state;
271 nt_status = gensec_gssapi_server_start(gensec_security);
272
273 if (NT_STATUS_IS_OK(nt_status)) {
274 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
275 gensec_gssapi_state->sasl = true;
276 }
277 return nt_status;
278 }
279
280 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
281 struct tevent_context *ev)
282 {
283 struct gensec_gssapi_state *gensec_gssapi_state;
284 struct gssapi_creds_container *gcc;
285 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
286 const char *error_string;
287 int ret;
288
289 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
290
291 /* Only run this the first time the update() call is made */
292 if (gensec_gssapi_state->client_cred) {
293 return NT_STATUS_OK;
294 }
295
296 ret = cli_credentials_get_client_gss_creds(creds,
297 ev,
298 gensec_security->settings->lp_ctx, &gcc, &error_string);
299 switch (ret) {
300 case 0:
301 break;
302 case EINVAL:
303 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
304 return NT_STATUS_INVALID_PARAMETER;
305 case KRB5KDC_ERR_PREAUTH_FAILED:
306 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
307 DEBUG(1, ("Wrong username or password: %s\n", error_string));
308 return NT_STATUS_LOGON_FAILURE;
309 case KRB5KDC_ERR_CLIENT_REVOKED:
310 DEBUG(1, ("Account locked out: %s\n", error_string));
311 return NT_STATUS_ACCOUNT_LOCKED_OUT;
312 case KRB5_KDC_UNREACH:
313 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
314 return NT_STATUS_NO_LOGON_SERVERS;
315 case KRB5_CC_NOTFOUND:
316 case KRB5_CC_END:
317 DEBUG(2, ("Error obtaining ticket we require to contact %s: (possibly due to clock skew between us and the KDC) %s\n", gensec_gssapi_state->target_principal, error_string));
318 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
319 default:
320 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
321 return NT_STATUS_UNSUCCESSFUL;
322 }
323
324 gensec_gssapi_state->client_cred = gcc;
325 if (!talloc_reference(gensec_gssapi_state, gcc)) {
326 return NT_STATUS_NO_MEMORY;
327 }
328
329 return NT_STATUS_OK;
330 }
331
332 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
333 {
334 struct gensec_gssapi_state *gensec_gssapi_state;
335 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
336 NTSTATUS nt_status;
337 gss_buffer_desc name_token;
338 gss_OID name_type;
339 OM_uint32 maj_stat, min_stat;
340 const char *hostname = gensec_get_target_hostname(gensec_security);
341
342 if (!hostname) {
343 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
344 return NT_STATUS_INVALID_PARAMETER;
345 }
346 if (is_ipaddress(hostname)) {
347 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
348 return NT_STATUS_INVALID_PARAMETER;
349 }
350 if (strcmp(hostname, "localhost") == 0) {
351 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
352 return NT_STATUS_INVALID_PARAMETER;
353 }
354
355 nt_status = gensec_gssapi_start(gensec_security);
356 if (!NT_STATUS_IS_OK(nt_status)) {
357 return nt_status;
358 }
359
360 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
361
362 if (cli_credentials_get_impersonate_principal(creds)) {
363 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
364 }
365
366 gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
367 if (gensec_gssapi_state->target_principal) {
368 name_type = GSS_C_NULL_OID;
369 } else {
370 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
371 gensec_get_target_service(gensec_security),
372 hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
373
374 name_type = GSS_C_NT_USER_NAME;
375 }
376 name_token.value = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
377 name_token.length = strlen(gensec_gssapi_state->target_principal);
378
379
380 maj_stat = gss_import_name (&min_stat,
381 &name_token,
382 name_type,
383 &gensec_gssapi_state->server_name);
384 if (maj_stat) {
385 DEBUG(2, ("GSS Import name of %s failed: %s\n",
386 (char *)name_token.value,
387 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
388 return NT_STATUS_INVALID_PARAMETER;
389 }
390
391 return NT_STATUS_OK;
392 }
393
394 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
395 {
396 NTSTATUS nt_status;
397 struct gensec_gssapi_state *gensec_gssapi_state;
398 nt_status = gensec_gssapi_client_start(gensec_security);
399
400 if (NT_STATUS_IS_OK(nt_status)) {
401 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
402 gensec_gssapi_state->sasl = true;
403 }
404 return nt_status;
405 }
406
407
408 /**
409 * Next state function for the GSSAPI GENSEC mechanism
410 *
411 * @param gensec_gssapi_state GSSAPI State
412 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
413 * @param in The request, as a DATA_BLOB
414 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
415 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
416 * or NT_STATUS_OK if the user is authenticated.
417 */
418
419 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
420 TALLOC_CTX *out_mem_ctx,
421 struct tevent_context *ev,
422 const DATA_BLOB in, DATA_BLOB *out)
423 {
424 struct gensec_gssapi_state *gensec_gssapi_state
425 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
426 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
427 OM_uint32 maj_stat, min_stat;
428 OM_uint32 min_stat2;
429 gss_buffer_desc input_token, output_token;
430 gss_OID gss_oid_p = NULL;
431 OM_uint32 time_req = 0;
432 OM_uint32 time_rec = 0;
433 struct timeval tv;
434
435 time_req = gensec_setting_int(gensec_security->settings,
436 "gensec_gssapi", "requested_life_time",
437 time_req);
438
439 input_token.length = in.length;
440 input_token.value = in.data;
441
442 switch (gensec_gssapi_state->sasl_state) {
443 case STAGE_GSS_NEG:
444 {
445 switch (gensec_security->gensec_role) {
446 case GENSEC_CLIENT:
447 {
448 #ifdef SAMBA4_USES_HEIMDAL
449 struct gsskrb5_send_to_kdc send_to_kdc;
450 #endif
451 krb5_error_code ret;
452
453 nt_status = gensec_gssapi_client_creds(gensec_security, ev);
454 if (!NT_STATUS_IS_OK(nt_status)) {
455 return nt_status;
456 }
457
458 #ifdef SAMBA4_USES_HEIMDAL
459 send_to_kdc.func = smb_krb5_send_and_recv_func;
460 send_to_kdc.ptr = ev;
461
462 min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
463 if (min_stat) {
464 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
465 return NT_STATUS_INTERNAL_ERROR;
466 }
467 #endif
468 maj_stat = gss_init_sec_context(&min_stat,
469 gensec_gssapi_state->client_cred->creds,
470 &gensec_gssapi_state->gssapi_context,
471 gensec_gssapi_state->server_name,
472 gensec_gssapi_state->gss_oid,
473 gensec_gssapi_state->gss_want_flags,
474 time_req,
475 gensec_gssapi_state->input_chan_bindings,
476 &input_token,
477 &gss_oid_p,
478 &output_token,
479 &gensec_gssapi_state->gss_got_flags, /* ret flags */
480 &time_rec);
481 if (gss_oid_p) {
482 gensec_gssapi_state->gss_oid = gss_oid_p;
483 }
484
485 #ifdef SAMBA4_USES_HEIMDAL
486 send_to_kdc.func = smb_krb5_send_and_recv_func;
487 send_to_kdc.ptr = NULL;
488
489 ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
490 if (ret) {
491 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
492 return NT_STATUS_INTERNAL_ERROR;
493 }
494 #endif
495 break;
496 }
497 case GENSEC_SERVER:
498 {
499 maj_stat = gss_accept_sec_context(&min_stat,
500 &gensec_gssapi_state->gssapi_context,
501 gensec_gssapi_state->server_cred->creds,
502 &input_token,
503 gensec_gssapi_state->input_chan_bindings,
504 &gensec_gssapi_state->client_name,
505 &gss_oid_p,
506 &output_token,
507 &gensec_gssapi_state->gss_got_flags,
508 &time_rec,
509 &gensec_gssapi_state->delegated_cred_handle);
510 if (gss_oid_p) {
511 gensec_gssapi_state->gss_oid = gss_oid_p;
512 }
513 break;
514 }
515 default:
516 return NT_STATUS_INVALID_PARAMETER;
517
518 }
519
520 gensec_gssapi_state->gss_exchange_count++;
521
522 if (maj_stat == GSS_S_COMPLETE) {
523 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
524 gss_release_buffer(&min_stat2, &output_token);
525
526 if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG) {
527 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
528 } else {
529 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
530 }
531
532 tv = timeval_current_ofs(time_rec, 0);
533 gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
534
535 /* We may have been invoked as SASL, so there
536 * is more work to do */
537 if (gensec_gssapi_state->sasl) {
538 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
539 return NT_STATUS_MORE_PROCESSING_REQUIRED;
540 } else {
541 gensec_gssapi_state->sasl_state = STAGE_DONE;
542
543 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
544 DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
545 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
546 DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
547 } else {
548 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
549 }
550
551 return NT_STATUS_OK;
552 }
553 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
554 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
555 gss_release_buffer(&min_stat2, &output_token);
556
557 return NT_STATUS_MORE_PROCESSING_REQUIRED;
558 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
559 gss_cred_id_t creds;
560 gss_name_t name;
561 gss_buffer_desc buffer;
562 OM_uint32 lifetime = 0;
563 gss_cred_usage_t usage;
564 const char *role = NULL;
565 DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
566 role,
567 gensec_gssapi_state->gss_exchange_count));
568
569
570 switch (gensec_security->gensec_role) {
571 case GENSEC_CLIENT:
572 creds = gensec_gssapi_state->client_cred->creds;
573 role = "client";
574 break;
575 case GENSEC_SERVER:
576 creds = gensec_gssapi_state->server_cred->creds;
577 role = "server";
578 break;
579 }
580
581 maj_stat = gss_inquire_cred(&min_stat,
582 creds,
583 &name, &lifetime, &usage, NULL);
584
585 if (maj_stat == GSS_S_COMPLETE) {
586 const char *usage_string;
587 switch (usage) {
588 case GSS_C_BOTH:
589 usage_string = "GSS_C_BOTH";
590 break;
591 case GSS_C_ACCEPT:
592 usage_string = "GSS_C_ACCEPT";
593 break;
594 case GSS_C_INITIATE:
595 usage_string = "GSS_C_INITIATE";
596 break;
597 }
598 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
599 if (maj_stat) {
600 buffer.value = NULL;
601 buffer.length = 0;
602 }
603 if (lifetime > 0) {
604 DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
605 (int)buffer.length, (int)buffer.length, (char *)buffer.value,
606 lifetime, usage_string));
607 } else {
608 DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
609 (int)buffer.length, (int)buffer.length, (char *)buffer.value,
610 usage_string));
611 }
612 gss_release_buffer(&min_stat, &buffer);
613 gss_release_name(&min_stat, &name);
614 } else if (maj_stat != GSS_S_COMPLETE) {
615 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
616 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
617 }
618 return NT_STATUS_INVALID_PARAMETER;
619 } else if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
620 gss_mech_krb5)) {
621 switch (min_stat) {
622 case KRB5KRB_AP_ERR_TKT_NYV:
623 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
624 gensec_gssapi_state->target_principal,
625 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
626 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
627 case KRB5KRB_AP_ERR_TKT_EXPIRED:
628 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
629 gensec_gssapi_state->target_principal,
630 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
631 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
632 case KRB5_KDC_UNREACH:
633 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticetk to %s: %s\n",
634 gensec_gssapi_state->target_principal,
635 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
636 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
637 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
638 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
639 gensec_gssapi_state->target_principal,
640 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
641 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
642 case KRB5KRB_AP_ERR_MSG_TYPE:
643 /* garbage input, possibly from the auto-mech detection */
644 return NT_STATUS_INVALID_PARAMETER;
645 default:
646 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
647 gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
648 gensec_gssapi_state->gss_exchange_count,
649 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
650 return nt_status;
651 }
652 } else {
653 DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
654 gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
655 gensec_gssapi_state->gss_exchange_count,
656 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
657 return nt_status;
658 }
659 break;
660 }
661
662 /* These last two stages are only done if we were invoked as SASL */
663 case STAGE_SASL_SSF_NEG:
664 {
665 switch (gensec_security->gensec_role) {
666 case GENSEC_CLIENT:
667 {
668 uint8_t maxlength_proposed[4];
669 uint8_t maxlength_accepted[4];
670 uint8_t security_supported;
671 int conf_state;
672 gss_qop_t qop_state;
673 input_token.length = in.length;
674 input_token.value = in.data;
675
676 /* As a client, we have just send a
677 * zero-length blob to the server (after the
678 * normal GSSAPI exchange), and it has replied
679 * with it's SASL negotiation */
680
681 maj_stat = gss_unwrap(&min_stat,
682 gensec_gssapi_state->gssapi_context,
683 &input_token,
684 &output_token,
685 &conf_state,
686 &qop_state);
687 if (GSS_ERROR(maj_stat)) {
688 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
689 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
690 return NT_STATUS_ACCESS_DENIED;
691 }
692
693 if (output_token.length < 4) {
694 return NT_STATUS_INVALID_PARAMETER;
695 }
696
697 memcpy(maxlength_proposed, output_token.value, 4);
698 gss_release_buffer(&min_stat, &output_token);
699
700 /* first byte is the proposed security */
701 security_supported = maxlength_proposed[0];
702 maxlength_proposed[0] = '\0';
703
704 /* Rest is the proposed max wrap length */
705 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
706 gensec_gssapi_state->max_wrap_buf_size);
707 gensec_gssapi_state->sasl_protection = 0;
708 if (security_supported & NEG_SEAL) {
709 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
710 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
711 }
712 }
713 if (security_supported & NEG_SIGN) {
714 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
715 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
716 }
717 }
718 if (security_supported & NEG_NONE) {
719 gensec_gssapi_state->sasl_protection |= NEG_NONE;
720 }
721 if (gensec_gssapi_state->sasl_protection == 0) {
722 DEBUG(1, ("Remote server does not support unprotected connections\n"));
723 return NT_STATUS_ACCESS_DENIED;
724 }
725
726 /* Send back the negotiated max length */
727
728 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
729
730 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
731
732 input_token.value = maxlength_accepted;
733 input_token.length = sizeof(maxlength_accepted);
734
735 maj_stat = gss_wrap(&min_stat,
736 gensec_gssapi_state->gssapi_context,
737 false,
738 GSS_C_QOP_DEFAULT,
739 &input_token,
740 &conf_state,
741 &output_token);
742 if (GSS_ERROR(maj_stat)) {
743 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
744 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
745 return NT_STATUS_ACCESS_DENIED;
746 }
747
748 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
749 gss_release_buffer(&min_stat, &output_token);
750
751 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
752 gensec_gssapi_state->sasl_state = STAGE_DONE;
753
754 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
755 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
756 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
757 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
758 } else {
759 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
760 }
761
762 return NT_STATUS_OK;
763 }
764 case GENSEC_SERVER:
765 {
766 uint8_t maxlength_proposed[4];
767 uint8_t security_supported = 0x0;
768 int conf_state;
769
770 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
771 if (in.length != 0) {
772 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
773 }
774
775 /* Give the client some idea what we will support */
776
777 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
778 /* first byte is the proposed security */
779 maxlength_proposed[0] = '\0';
780
781 gensec_gssapi_state->sasl_protection = 0;
782 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
783 security_supported |= NEG_SEAL;
784 }
785 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
786 security_supported |= NEG_SIGN;
787 }
788 if (security_supported == 0) {
789 /* If we don't support anything, this must be 0 */
790 RSIVAL(maxlength_proposed, 0, 0x0);
791 }
792
793 /* TODO: We may not wish to support this */
794 security_supported |= NEG_NONE;
795 maxlength_proposed[0] = security_supported;
796
797 input_token.value = maxlength_proposed;
798 input_token.length = sizeof(maxlength_proposed);
799
800 maj_stat = gss_wrap(&min_stat,
801 gensec_gssapi_state->gssapi_context,
802 false,
803 GSS_C_QOP_DEFAULT,
804 &input_token,
805 &conf_state,
806 &output_token);
807 if (GSS_ERROR(maj_stat)) {
808 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
809 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
810 return NT_STATUS_ACCESS_DENIED;
811 }
812
813 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
814 gss_release_buffer(&min_stat, &output_token);
815
816 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
817 return NT_STATUS_MORE_PROCESSING_REQUIRED;
818 }
819 default:
820 return NT_STATUS_INVALID_PARAMETER;
821
822 }
823 }
824 /* This is s server-only stage */
825 case STAGE_SASL_SSF_ACCEPT:
826 {
827 uint8_t maxlength_accepted[4];
828 uint8_t security_accepted;
829 int conf_state;
830 gss_qop_t qop_state;
831 input_token.length = in.length;
832 input_token.value = in.data;
833
834 maj_stat = gss_unwrap(&min_stat,
835 gensec_gssapi_state->gssapi_context,
836 &input_token,
837 &output_token,
838 &conf_state,
839 &qop_state);
840 if (GSS_ERROR(maj_stat)) {
841 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
842 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
843 return NT_STATUS_ACCESS_DENIED;
844 }
845
846 if (output_token.length < 4) {
847 return NT_STATUS_INVALID_PARAMETER;
848 }
849
850 memcpy(maxlength_accepted, output_token.value, 4);
851 gss_release_buffer(&min_stat, &output_token);
852
853 /* first byte is the proposed security */
854 security_accepted = maxlength_accepted[0];
855 maxlength_accepted[0] = '\0';
856
857 /* Rest is the proposed max wrap length */
858 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
859 gensec_gssapi_state->max_wrap_buf_size);
860
861 gensec_gssapi_state->sasl_protection = 0;
862 if (security_accepted & NEG_SEAL) {
863 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
864 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
865 return NT_STATUS_ACCESS_DENIED;
866 }
867 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
868 }
869 if (security_accepted & NEG_SIGN) {
870 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
871 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
872 return NT_STATUS_ACCESS_DENIED;
873 }
874 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
875 }
876 if (security_accepted & NEG_NONE) {
877 gensec_gssapi_state->sasl_protection |= NEG_NONE;
878 }
879
880 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
881 gensec_gssapi_state->sasl_state = STAGE_DONE;
882 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
883 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
884 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
885 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
886 } else {
887 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
888 }
889
890 *out = data_blob(NULL, 0);
891 return NT_STATUS_OK;
892 }
893 default:
894 return NT_STATUS_INVALID_PARAMETER;
895 }
896 }
897
898 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
899 TALLOC_CTX *mem_ctx,
900 const DATA_BLOB *in,
901 DATA_BLOB *out)
902 {
903 struct gensec_gssapi_state *gensec_gssapi_state
904 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
905 OM_uint32 maj_stat, min_stat;
906 gss_buffer_desc input_token, output_token;
907 int conf_state;
908 input_token.length = in->length;
909 input_token.value = in->data;
910
911 maj_stat = gss_wrap(&min_stat,
912 gensec_gssapi_state->gssapi_context,
913 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
914 GSS_C_QOP_DEFAULT,
915 &input_token,
916 &conf_state,
917 &output_token);
918 if (GSS_ERROR(maj_stat)) {
919 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
920 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
921 return NT_STATUS_ACCESS_DENIED;
922 }
923
924 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
925 gss_release_buffer(&min_stat, &output_token);
926
927 if (gensec_gssapi_state->sasl) {
928 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
929 if (max_wrapped_size < out->length) {
930 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
931 (unsigned)in->length,
932 (unsigned)out->length,
933 (unsigned int)max_wrapped_size));
934 return NT_STATUS_INVALID_PARAMETER;
935 }
936 }
937
938 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
939 && !conf_state) {
940 return NT_STATUS_ACCESS_DENIED;
941 }
942 return NT_STATUS_OK;
943 }
944
945 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
946 TALLOC_CTX *mem_ctx,
947 const DATA_BLOB *in,
948 DATA_BLOB *out)
949 {
950 struct gensec_gssapi_state *gensec_gssapi_state
951 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
952 OM_uint32 maj_stat, min_stat;
953 gss_buffer_desc input_token, output_token;
954 int conf_state;
955 gss_qop_t qop_state;
956 input_token.length = in->length;
957 input_token.value = in->data;
958
959 if (gensec_gssapi_state->sasl) {
960 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
961 if (max_wrapped_size < in->length) {
962 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
963 return NT_STATUS_INVALID_PARAMETER;
964 }
965 }
966
967 maj_stat = gss_unwrap(&min_stat,
968 gensec_gssapi_state->gssapi_context,
969 &input_token,
970 &output_token,
971 &conf_state,
972 &qop_state);
973 if (GSS_ERROR(maj_stat)) {
974 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
975 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
976 return NT_STATUS_ACCESS_DENIED;
977 }
978
979 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
980 gss_release_buffer(&min_stat, &output_token);
981
982 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
983 && !conf_state) {
984 return NT_STATUS_ACCESS_DENIED;
985 }
986 return NT_STATUS_OK;
987 }
988
989 /* Find out the maximum input size negotiated on this connection */
990
991 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
992 {
993 struct gensec_gssapi_state *gensec_gssapi_state
994 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
995 OM_uint32 maj_stat, min_stat;
996 OM_uint32 max_input_size;
997
998 maj_stat = gss_wrap_size_limit(&min_stat,
999 gensec_gssapi_state->gssapi_context,
1000 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1001 GSS_C_QOP_DEFAULT,
1002 gensec_gssapi_state->max_wrap_buf_size,
1003 &max_input_size);
1004 if (GSS_ERROR(maj_stat)) {
1005 TALLOC_CTX *mem_ctx = talloc_new(NULL);
1006 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
1007 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1008 talloc_free(mem_ctx);
1009 return 0;
1010 }
1011
1012 return max_input_size;
1013 }
1014
1015 /* Find out the maximum output size negotiated on this connection */
1016 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
1017 {
1018 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
1019 return gensec_gssapi_state->max_wrap_buf_size;
1020 }
1021
1022 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
1023 TALLOC_CTX *mem_ctx,
1024 uint8_t *data, size_t length,
1025 const uint8_t *whole_pdu, size_t pdu_length,
1026 DATA_BLOB *sig)
1027 {
1028 struct gensec_gssapi_state *gensec_gssapi_state
1029 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1030 OM_uint32 maj_stat, min_stat;
1031 gss_buffer_desc input_token, output_token;
1032 int conf_state;
1033 ssize_t sig_length;
1034
1035 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1036 DEBUG(1, ("gensec_gssapi_seal_packet: "
1037 "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1038 return NT_STATUS_ACCESS_DENIED;
1039 }
1040
1041 input_token.length = length;
1042 input_token.value = data;
1043
1044 maj_stat = gss_wrap(&min_stat,
1045 gensec_gssapi_state->gssapi_context,
1046 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
1047 GSS_C_QOP_DEFAULT,
1048 &input_token,
1049 &conf_state,
1050 &output_token);
1051 if (GSS_ERROR(maj_stat)) {
1052 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
1053 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1054 return NT_STATUS_ACCESS_DENIED;
1055 }
1056
1057 if (output_token.length < input_token.length) {
1058 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1059 (long)output_token.length, (long)length));
1060 return NT_STATUS_INTERNAL_ERROR;
1061 }
1062 sig_length = output_token.length - input_token.length;
1063
1064 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
1065 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1066
1067 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1068 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
1069 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
1070
1071 gss_release_buffer(&min_stat, &output_token);
1072
1073 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1074 && !conf_state) {
1075 return NT_STATUS_ACCESS_DENIED;
1076 }
1077 return NT_STATUS_OK;
1078 }
1079
1080 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1081 uint8_t *data, size_t length,
1082 const uint8_t *whole_pdu, size_t pdu_length,
1083 const DATA_BLOB *sig)
1084 {
1085 struct gensec_gssapi_state *gensec_gssapi_state
1086 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1087 OM_uint32 maj_stat, min_stat;
1088 gss_buffer_desc input_token, output_token;
1089 int conf_state;
1090 gss_qop_t qop_state;
1091 DATA_BLOB in;
1092
1093 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
1094
1095 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1096 DEBUG(1, ("gensec_gssapi_unseal_packet: "
1097 "GENSEC_FEATURE_SIGN_PKT_HEADER not supported\n"));
1098 return NT_STATUS_ACCESS_DENIED;
1099 }
1100
1101 in = data_blob_talloc(gensec_security, NULL, sig->length + length);
1102
1103 memcpy(in.data, sig->data, sig->length);
1104 memcpy(in.data + sig->length, data, length);
1105
1106 input_token.length = in.length;
1107 input_token.value = in.data;
1108
1109 maj_stat = gss_unwrap(&min_stat,
1110 gensec_gssapi_state->gssapi_context,
1111 &input_token,
1112 &output_token,
1113 &conf_state,
1114 &qop_state);
1115 talloc_free(in.data);
1116 if (GSS_ERROR(maj_stat)) {
1117 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1118 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
1119 error_string));
1120 talloc_free(error_string);
1121 return NT_STATUS_ACCESS_DENIED;
1122 }
1123
1124 if (output_token.length != length) {
1125 return NT_STATUS_INTERNAL_ERROR;
1126 }
1127
1128 memcpy(data, output_token.value, length);
1129
1130 gss_release_buffer(&min_stat, &output_token);
1131
1132 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
1133 && !conf_state) {
1134 return NT_STATUS_ACCESS_DENIED;
1135 }
1136 return NT_STATUS_OK;
1137 }
1138
1139 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1140 TALLOC_CTX *mem_ctx,
1141 const uint8_t *data, size_t length,
1142 const uint8_t *whole_pdu, size_t pdu_length,
1143 DATA_BLOB *sig)
1144 {
1145 struct gensec_gssapi_state *gensec_gssapi_state
1146 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1147 OM_uint32 maj_stat, min_stat;
1148 gss_buffer_desc input_token, output_token;
1149
1150 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1151 input_token.length = pdu_length;
1152 input_token.value = discard_const_p(uint8_t *, whole_pdu);
1153 } else {
1154 input_token.length = length;
1155 input_token.value = discard_const_p(uint8_t *, data);
1156 }
1157
1158 maj_stat = gss_get_mic(&min_stat,
1159 gensec_gssapi_state->gssapi_context,
1160 GSS_C_QOP_DEFAULT,
1161 &input_token,
1162 &output_token);
1163 if (GSS_ERROR(maj_stat)) {
1164 DEBUG(1, ("GSS GetMic failed: %s\n",
1165 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1166 return NT_STATUS_ACCESS_DENIED;
1167 }
1168
1169 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, output_token.length);
1170
1171 dump_data_pw("gensec_gssapi_sign_packet: sig\n", sig->data, sig->length);
1172
1173 gss_release_buffer(&min_stat, &output_token);
1174
1175 return NT_STATUS_OK;
1176 }
1177
1178 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1179 const uint8_t *data, size_t length,
1180 const uint8_t *whole_pdu, size_t pdu_length,
1181 const DATA_BLOB *sig)
1182 {
1183 struct gensec_gssapi_state *gensec_gssapi_state
1184 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1185 OM_uint32 maj_stat, min_stat;
1186 gss_buffer_desc input_token;
1187 gss_buffer_desc input_message;
1188 gss_qop_t qop_state;
1189
1190 dump_data_pw("gensec_gssapi_check_packet: sig\n", sig->data, sig->length);
1191
1192 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1193 input_message.length = pdu_length;
1194 input_message.value = discard_const(whole_pdu);
1195 } else {
1196 input_message.length = length;
1197 input_message.value = discard_const(data);
1198 }
1199
1200 input_token.length = sig->length;
1201 input_token.value = sig->data;
1202
1203 maj_stat = gss_verify_mic(&min_stat,
1204 gensec_gssapi_state->gssapi_context,
1205 &input_message,
1206 &input_token,
1207 &qop_state);
1208 if (GSS_ERROR(maj_stat)) {
1209 char *error_string = gssapi_error_string(NULL, maj_stat, min_stat, gensec_gssapi_state->gss_oid);
1210 DEBUG(1, ("GSS VerifyMic failed: %s\n", error_string));
1211 talloc_free(error_string);
1212
1213 return NT_STATUS_ACCESS_DENIED;
1214 }
1215
1216 return NT_STATUS_OK;
1217 }
1218
1219 /* Try to figure out what features we actually got on the connection */
1220 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1221 uint32_t feature)
1222 {
1223 struct gensec_gssapi_state *gensec_gssapi_state
1224 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1225 if (feature & GENSEC_FEATURE_SIGN) {
1226 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1227 if (gensec_gssapi_state->sasl
1228 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1229 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1230 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1231 }
1232 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1233 }
1234 if (feature & GENSEC_FEATURE_SEAL) {
1235 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1236 if (gensec_gssapi_state->sasl
1237 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1238 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1239 && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1240 }
1241 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1242 }
1243 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1244 /* Only for GSSAPI/Krb5 */
1245 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1246 gss_mech_krb5)) {
1247 return true;
1248 }
1249 }
1250 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1251 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1252 }
1253 if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1254 NTSTATUS status;
1255 uint32_t keytype;
1256
1257 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1258 return false;
1259 }
1260
1261 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1262 return true;
1263 }
1264 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1265 return false;
1266 }
1267
1268 status = gssapi_get_session_key(gensec_gssapi_state,
1269 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1270 /*
1271 * We should do a proper sig on the mechListMic unless
1272 * we know we have to be backwards compatible with
1273 * earlier windows versions.
1274 *
1275 * Negotiating a non-krb5
1276 * mech for example should be regarded as having
1277 * NEW_SPNEGO
1278 */
1279 if (NT_STATUS_IS_OK(status)) {
1280 switch (keytype) {
1281 case ENCTYPE_DES_CBC_CRC:
1282 case ENCTYPE_DES_CBC_MD5:
1283 case ENCTYPE_ARCFOUR_HMAC:
1284 case ENCTYPE_DES3_CBC_SHA1:
1285 return false;
1286 }
1287 }
1288 return true;
1289 }
1290 /* We can always do async (rather than strict request/reply) packets. */
1291 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1292 return true;
1293 }
1294 if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1295 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
1296 /* TODO: implement this using gss_wrap_iov() */
1297 return false;
1298 }
1299
1300 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
1301 return true;
1302 }
1303
1304 return false;
1305 }
1306 return false;
1307 }
1308
1309 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1310 {
1311 struct gensec_gssapi_state *gensec_gssapi_state =
1312 talloc_get_type_abort(gensec_security->private_data,
1313 struct gensec_gssapi_state);
1314
1315 return gensec_gssapi_state->expire_time;
1316 }
1317
1318 /*
1319 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1320 * (for encrypting some passwords).
1321 *
1322 * This breaks all the abstractions, but what do you expect...
1323 */
1324 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1325 TALLOC_CTX *mem_ctx,
1326 DATA_BLOB *session_key)
1327 {
1328 struct gensec_gssapi_state *gensec_gssapi_state
1329 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1330 return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1331 }
1332
1333 /* Get some basic (and authorization) information about the user on
1334 * this session. This uses either the PAC (if present) or a local
1335 * database lookup */
1336 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1337 TALLOC_CTX *mem_ctx,
1338 struct auth_session_info **_session_info)
1339 {
1340 NTSTATUS nt_status;
1341 TALLOC_CTX *tmp_ctx;
1342 struct gensec_gssapi_state *gensec_gssapi_state
1343 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1344 struct auth_session_info *session_info = NULL;
1345 OM_uint32 maj_stat, min_stat;
1346 DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1347
1348 gss_buffer_desc name_token;
1349 char *principal_string;
1350
1351 tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1352 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1353
1354 maj_stat = gss_display_name (&min_stat,
1355 gensec_gssapi_state->client_name,
1356 &name_token,
1357 NULL);
1358 if (GSS_ERROR(maj_stat)) {
1359 DEBUG(1, ("GSS display_name failed: %s\n",
1360 gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1361 talloc_free(tmp_ctx);
1362 return NT_STATUS_FOOBAR;
1363 }
1364
1365 principal_string = talloc_strndup(tmp_ctx,
1366 (const char *)name_token.value,
1367 name_token.length);
1368
1369 gss_release_buffer(&min_stat, &name_token);
1370
1371 if (!principal_string) {
1372 talloc_free(tmp_ctx);
1373 return NT_STATUS_NO_MEMORY;
1374 }
1375
1376 nt_status = gssapi_obtain_pac_blob(tmp_ctx, gensec_gssapi_state->gssapi_context,
1377 gensec_gssapi_state->client_name,
1378 &pac_blob);
1379
1380 /* IF we have the PAC - otherwise we need to get this
1381 * data from elsewere - local ldb, or (TODO) lookup of some
1382 * kind...
1383 */
1384 if (NT_STATUS_IS_OK(nt_status)) {
1385 pac_blob_ptr = &pac_blob;
1386 }
1387 nt_status = gensec_generate_session_info_pac(tmp_ctx,
1388 gensec_security,
1389 gensec_gssapi_state->smb_krb5_context,
1390 pac_blob_ptr, principal_string,
1391 gensec_get_remote_address(gensec_security),
1392 &session_info);
1393 if (!NT_STATUS_IS_OK(nt_status)) {
1394 talloc_free(tmp_ctx);
1395 return nt_status;
1396 }
1397
1398 nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1399 if (!NT_STATUS_IS_OK(nt_status)) {
1400 talloc_free(tmp_ctx);
1401 return nt_status;
1402 }
1403
1404 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG)) {
1405 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1406 } else {
1407 krb5_error_code ret;
1408 const char *error_string;
1409
1410 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1411 session_info->credentials = cli_credentials_init(session_info);
1412 if (!session_info->credentials) {
1413 talloc_free(tmp_ctx);
1414 return NT_STATUS_NO_MEMORY;
1415 }
1416
1417 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1418 /* Just so we don't segfault trying to get at a username */
1419 cli_credentials_set_anonymous(session_info->credentials);
1420
1421 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1422 gensec_security->settings->lp_ctx,
1423 gensec_gssapi_state->delegated_cred_handle,
1424 CRED_SPECIFIED, &error_string);
1425 if (ret) {
1426 talloc_free(tmp_ctx);
1427 DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1428 return NT_STATUS_NO_MEMORY;
1429 }
1430
1431 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1432 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1433
1434 /* It has been taken from this place... */
1435 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1436 }
1437 *_session_info = talloc_steal(mem_ctx, session_info);
1438 talloc_free(tmp_ctx);
1439
1440 return NT_STATUS_OK;
1441 }
1442
1443 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1444 {
1445 struct gensec_gssapi_state *gensec_gssapi_state
1446 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1447 NTSTATUS status;
1448
1449 if (gensec_gssapi_state->sig_size) {
1450 return gensec_gssapi_state->sig_size;
1451 }
1452
1453 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1454 gensec_gssapi_state->sig_size = 45;
1455 } else {
1456 gensec_gssapi_state->sig_size = 37;
1457 }
1458
1459 status = gensec_gssapi_init_lucid(gensec_gssapi_state);
1460 if (!NT_STATUS_IS_OK(status)) {
1461 return gensec_gssapi_state->sig_size;
1462 }
1463
1464 if (gensec_gssapi_state->lucid->protocol == 1) {
1465 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1466 /*
1467 * TODO: windows uses 76 here, but we don't know
1468 * gss_wrap works with aes keys yet
1469 */
1470 gensec_gssapi_state->sig_size = 76;
1471 } else {
1472 gensec_gssapi_state->sig_size = 28;
1473 }
1474 } else if (gensec_gssapi_state->lucid->protocol == 0) {
1475 switch (gensec_gssapi_state->lucid->rfc1964_kd.ctx_key.type) {
1476 case ENCTYPE_DES_CBC_CRC:
1477 case ENCTYPE_ARCFOUR_HMAC:
1478 case ENCTYPE_ARCFOUR_HMAC_EXP:
1479 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1480 gensec_gssapi_state->sig_size = 45;
1481 } else {
1482 gensec_gssapi_state->sig_size = 37;
1483 }
1484 break;
1485 #ifdef SAMBA4_USES_HEIMDAL
1486 case ENCTYPE_OLD_DES3_CBC_SHA1:
1487 if (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG) {
1488 gensec_gssapi_state->sig_size = 57;
1489 } else {
1490 gensec_gssapi_state->sig_size = 49;
1491 }
1492 break;
1493 #endif
1494 }
1495 }
1496
1497 return gensec_gssapi_state->sig_size;
1498 }
1499
1500 static const char *gensec_gssapi_krb5_oids[] = {
1501 GENSEC_OID_KERBEROS5_OLD,
1502 GENSEC_OID_KERBEROS5,
1503 NULL
1504 };
1505
1506 static const char *gensec_gssapi_spnego_oids[] = {
1507 GENSEC_OID_SPNEGO,
1508 NULL
1509 };
1510
1511 /* As a server, this could in theory accept any GSSAPI mech */
1512 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1513 .name = "gssapi_spnego",
1514 .sasl_name = "GSS-SPNEGO",
1515 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1516 .oid = gensec_gssapi_spnego_oids,
1517 .client_start = gensec_gssapi_client_start,
1518 .server_start = gensec_gssapi_server_start,
1519 .magic = gensec_magic_check_krb5_oid,
1520 .update = gensec_gssapi_update,
1521 .session_key = gensec_gssapi_session_key,
1522 .session_info = gensec_gssapi_session_info,
1523 .sign_packet = gensec_gssapi_sign_packet,
1524 .check_packet = gensec_gssapi_check_packet,
1525 .seal_packet = gensec_gssapi_seal_packet,
1526 .unseal_packet = gensec_gssapi_unseal_packet,
1527 .wrap = gensec_gssapi_wrap,
1528 .unwrap = gensec_gssapi_unwrap,
1529 .have_feature = gensec_gssapi_have_feature,
1530 .expire_time = gensec_gssapi_expire_time,
1531 .enabled = false,
1532 .kerberos = true,
1533 .priority = GENSEC_GSSAPI
1534 };
1535
1536 /* As a server, this could in theory accept any GSSAPI mech */
1537 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1538 .name = "gssapi_krb5",
1539 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1540 .oid = gensec_gssapi_krb5_oids,
1541 .client_start = gensec_gssapi_client_start,
1542 .server_start = gensec_gssapi_server_start,
1543 .magic = gensec_magic_check_krb5_oid,
1544 .update = gensec_gssapi_update,
1545 .session_key = gensec_gssapi_session_key,
1546 .session_info = gensec_gssapi_session_info,
1547 .sig_size = gensec_gssapi_sig_size,
1548 .sign_packet = gensec_gssapi_sign_packet,
1549 .check_packet = gensec_gssapi_check_packet,
1550 .seal_packet = gensec_gssapi_seal_packet,
1551 .unseal_packet = gensec_gssapi_unseal_packet,
1552 .wrap = gensec_gssapi_wrap,
1553 .unwrap = gensec_gssapi_unwrap,
1554 .have_feature = gensec_gssapi_have_feature,
1555 .expire_time = gensec_gssapi_expire_time,
1556 .enabled = true,
1557 .kerberos = true,
1558 .priority = GENSEC_GSSAPI
1559 };
1560
1561 /* As a server, this could in theory accept any GSSAPI mech */
1562 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1563 .name = "gssapi_krb5_sasl",
1564 .sasl_name = "GSSAPI",
1565 .client_start = gensec_gssapi_sasl_client_start,
1566 .server_start = gensec_gssapi_sasl_server_start,
1567 .update = gensec_gssapi_update,
1568 .session_key = gensec_gssapi_session_key,
1569 .session_info = gensec_gssapi_session_info,
1570 .max_input_size = gensec_gssapi_max_input_size,
1571 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1572 .wrap = gensec_gssapi_wrap,
1573 .unwrap = gensec_gssapi_unwrap,
1574 .have_feature = gensec_gssapi_have_feature,
1575 .expire_time = gensec_gssapi_expire_time,
1576 .enabled = true,
1577 .kerberos = true,
1578 .priority = GENSEC_GSSAPI
1579 };
1580
1581 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1582 {
1583 NTSTATUS ret;
1584
1585 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1586 if (!NT_STATUS_IS_OK(ret)) {
1587 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1588 gensec_gssapi_spnego_security_ops.name));
1589 return ret;
1590 }
1591
1592 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1593 if (!NT_STATUS_IS_OK(ret)) {
1594 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1595 gensec_gssapi_krb5_security_ops.name));
1596 return ret;
1597 }
1598
1599 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1600 if (!NT_STATUS_IS_OK(ret)) {
1601 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1602 gensec_gssapi_sasl_krb5_security_ops.name));
1603 return ret;
1604 }
1605
1606 return ret;
1607 }
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