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s4:gensec_gssapi: pass gss_got_flags to gssapi_get_sig_size()
[Samba.git] / source4 / auth / gensec / gensec_gssapi.c
blob59b870f21de56bd6c841159ed55aeb99a4f96ee5
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 #include "auth/kerberos/gssapi_helper.h"
46
47 #ifndef gss_mech_spnego
48 gss_OID_desc spnego_mech_oid_desc =
49 { 6, discard_const_p(void, "\x2b\x06\x01\x05\x05\x02") };
50 #define gss_mech_spnego (&spnego_mech_oid_desc)
51 #endif
52
53 _PUBLIC_ NTSTATUS gensec_gssapi_init(void);
54
55 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
56 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
57 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size);
58
59 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
60 {
61 OM_uint32 min_stat;
62
63 if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
64 gss_release_cred(&min_stat,
65 &gensec_gssapi_state->delegated_cred_handle);
66 }
67
68 if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
69 gss_delete_sec_context(&min_stat,
70 &gensec_gssapi_state->gssapi_context,
71 GSS_C_NO_BUFFER);
72 }
73
74 if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
75 gss_release_name(&min_stat,
76 &gensec_gssapi_state->server_name);
77 }
78 if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
79 gss_release_name(&min_stat,
80 &gensec_gssapi_state->client_name);
81 }
82
83 return 0;
84 }
85
86 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
87 {
88 struct gensec_gssapi_state *gensec_gssapi_state;
89 krb5_error_code ret;
90 #ifdef SAMBA4_USES_HEIMDAL
91 const char *realm;
92 #endif
93
94 gensec_gssapi_state = talloc_zero(gensec_security, struct gensec_gssapi_state);
95 if (!gensec_gssapi_state) {
96 return NT_STATUS_NO_MEMORY;
97 }
98
99 gensec_security->private_data = gensec_gssapi_state;
100
101 gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
102
103 /* TODO: Fill in channel bindings */
104 gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
105
106 gensec_gssapi_state->server_name = GSS_C_NO_NAME;
107 gensec_gssapi_state->client_name = GSS_C_NO_NAME;
108
109 gensec_gssapi_state->gss_want_flags = 0;
110 gensec_gssapi_state->expire_time = GENSEC_EXPIRE_TIME_INFINITY;
111
112 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation_by_kdc_policy", true)) {
113 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_POLICY_FLAG;
114 }
115 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "mutual", true)) {
116 gensec_gssapi_state->gss_want_flags |= GSS_C_MUTUAL_FLAG;
117 }
118 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "delegation", true)) {
119 gensec_gssapi_state->gss_want_flags |= GSS_C_DELEG_FLAG;
120 }
121 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "replay", true)) {
122 gensec_gssapi_state->gss_want_flags |= GSS_C_REPLAY_FLAG;
123 }
124 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "sequence", true)) {
125 gensec_gssapi_state->gss_want_flags |= GSS_C_SEQUENCE_FLAG;
126 }
127
128 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
129 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
130 }
131 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
132 gensec_gssapi_state->gss_want_flags |= GSS_C_INTEG_FLAG;
133 gensec_gssapi_state->gss_want_flags |= GSS_C_CONF_FLAG;
134 }
135 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
136 gensec_gssapi_state->gss_want_flags |= GSS_C_DCE_STYLE;
137 }
138
139 gensec_gssapi_state->gss_got_flags = 0;
140
141 switch (gensec_security->ops->auth_type) {
142 case DCERPC_AUTH_TYPE_SPNEGO:
143 gensec_gssapi_state->gss_oid = gss_mech_spnego;
144 break;
145 case DCERPC_AUTH_TYPE_KRB5:
146 default:
147 gensec_gssapi_state->gss_oid =
148 discard_const_p(void, gss_mech_krb5);
149 break;
150 }
151
152 ret = smb_krb5_init_context(gensec_gssapi_state,
153 gensec_security->settings->lp_ctx,
154 &gensec_gssapi_state->smb_krb5_context);
155 if (ret) {
156 DEBUG(1,("gensec_gssapi_start: smb_krb5_init_context failed (%s)\n",
157 error_message(ret)));
158 talloc_free(gensec_gssapi_state);
159 return NT_STATUS_INTERNAL_ERROR;
160 }
161
162 gensec_gssapi_state->client_cred = NULL;
163 gensec_gssapi_state->server_cred = NULL;
164
165 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
166
167 gensec_gssapi_state->sasl = false;
168 gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
169 gensec_gssapi_state->sasl_protection = 0;
170
171 gensec_gssapi_state->max_wrap_buf_size
172 = gensec_setting_int(gensec_security->settings, "gensec_gssapi", "max wrap buf size", 65536);
173 gensec_gssapi_state->gss_exchange_count = 0;
174 gensec_gssapi_state->sig_size = 0;
175
176 talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
177
178 #ifdef SAMBA4_USES_HEIMDAL
179 realm = lpcfg_realm(gensec_security->settings->lp_ctx);
180 if (realm != NULL) {
181 ret = gsskrb5_set_default_realm(realm);
182 if (ret) {
183 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_default_realm failed\n"));
184 talloc_free(gensec_gssapi_state);
185 return NT_STATUS_INTERNAL_ERROR;
186 }
187 }
188
189 /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
190 ret = gsskrb5_set_dns_canonicalize(gensec_setting_bool(gensec_security->settings, "krb5", "set_dns_canonicalize", false));
191 if (ret) {
192 DEBUG(1,("gensec_gssapi_start: gsskrb5_set_dns_canonicalize failed\n"));
193 talloc_free(gensec_gssapi_state);
194 return NT_STATUS_INTERNAL_ERROR;
195 }
196 #endif
197 return NT_STATUS_OK;
198 }
199
200 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
201 {
202 NTSTATUS nt_status;
203 int ret;
204 struct gensec_gssapi_state *gensec_gssapi_state;
205 struct cli_credentials *machine_account;
206 struct gssapi_creds_container *gcc;
207
208 nt_status = gensec_gssapi_start(gensec_security);
209 if (!NT_STATUS_IS_OK(nt_status)) {
210 return nt_status;
211 }
212
213 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
214
215 machine_account = gensec_get_credentials(gensec_security);
216
217 if (!machine_account) {
218 DEBUG(3, ("No machine account credentials specified\n"));
219 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
220 } else {
221 ret = cli_credentials_get_server_gss_creds(machine_account,
222 gensec_security->settings->lp_ctx, &gcc);
223 if (ret) {
224 DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
225 error_message(ret)));
226 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
227 }
228 }
229
230 gensec_gssapi_state->server_cred = gcc;
231 return NT_STATUS_OK;
232
233 }
234
235 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
236 {
237 NTSTATUS nt_status;
238 struct gensec_gssapi_state *gensec_gssapi_state;
239 nt_status = gensec_gssapi_server_start(gensec_security);
240
241 if (NT_STATUS_IS_OK(nt_status)) {
242 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
243 gensec_gssapi_state->sasl = true;
244 }
245 return nt_status;
246 }
247
248 static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
249 struct tevent_context *ev)
250 {
251 struct gensec_gssapi_state *gensec_gssapi_state;
252 struct gssapi_creds_container *gcc;
253 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
254 const char *error_string;
255 int ret;
256
257 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
258
259 /* Only run this the first time the update() call is made */
260 if (gensec_gssapi_state->client_cred) {
261 return NT_STATUS_OK;
262 }
263
264 ret = cli_credentials_get_client_gss_creds(creds,
265 ev,
266 gensec_security->settings->lp_ctx, &gcc, &error_string);
267 switch (ret) {
268 case 0:
269 break;
270 case EINVAL:
271 DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
272 return NT_STATUS_INVALID_PARAMETER;
273 case KRB5KDC_ERR_PREAUTH_FAILED:
274 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
275 case KRB5KRB_AP_ERR_BAD_INTEGRITY:
276 DEBUG(1, ("Wrong username or password: %s\n", error_string));
277 return NT_STATUS_LOGON_FAILURE;
278 case KRB5KDC_ERR_CLIENT_REVOKED:
279 DEBUG(1, ("Account locked out: %s\n", error_string));
280 return NT_STATUS_ACCOUNT_LOCKED_OUT;
281 case KRB5_REALM_UNKNOWN:
282 case KRB5_KDC_UNREACH:
283 DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
284 return NT_STATUS_NO_LOGON_SERVERS;
285 case KRB5_CC_NOTFOUND:
286 case KRB5_CC_END:
287 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));
288 return NT_STATUS_TIME_DIFFERENCE_AT_DC;
289 default:
290 DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
291 return NT_STATUS_UNSUCCESSFUL;
292 }
293
294 gensec_gssapi_state->client_cred = gcc;
295 if (!talloc_reference(gensec_gssapi_state, gcc)) {
296 return NT_STATUS_NO_MEMORY;
297 }
298
299 return NT_STATUS_OK;
300 }
301
302 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
303 {
304 struct gensec_gssapi_state *gensec_gssapi_state;
305 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
306 NTSTATUS nt_status;
307 gss_buffer_desc name_token;
308 gss_OID name_type;
309 OM_uint32 maj_stat, min_stat;
310 const char *hostname = gensec_get_target_hostname(gensec_security);
311
312 if (!hostname) {
313 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
314 return NT_STATUS_INVALID_PARAMETER;
315 }
316 if (is_ipaddress(hostname)) {
317 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
318 return NT_STATUS_INVALID_PARAMETER;
319 }
320 if (strcmp(hostname, "localhost") == 0) {
321 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
322 return NT_STATUS_INVALID_PARAMETER;
323 }
324
325 nt_status = gensec_gssapi_start(gensec_security);
326 if (!NT_STATUS_IS_OK(nt_status)) {
327 return nt_status;
328 }
329
330 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
331
332 if (cli_credentials_get_impersonate_principal(creds)) {
333 gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
334 }
335
336 gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
337 if (gensec_gssapi_state->target_principal) {
338 name_type = GSS_C_NULL_OID;
339 } else {
340 gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
341 gensec_get_target_service(gensec_security),
342 hostname, lpcfg_realm(gensec_security->settings->lp_ctx));
343
344 name_type = GSS_C_NT_USER_NAME;
345 }
346 name_token.value = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
347 name_token.length = strlen(gensec_gssapi_state->target_principal);
348
349
350 maj_stat = gss_import_name (&min_stat,
351 &name_token,
352 name_type,
353 &gensec_gssapi_state->server_name);
354 if (maj_stat) {
355 DEBUG(2, ("GSS Import name of %s failed: %s\n",
356 (char *)name_token.value,
357 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
358 return NT_STATUS_INVALID_PARAMETER;
359 }
360
361 return NT_STATUS_OK;
362 }
363
364 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
365 {
366 NTSTATUS nt_status;
367 struct gensec_gssapi_state *gensec_gssapi_state;
368 nt_status = gensec_gssapi_client_start(gensec_security);
369
370 if (NT_STATUS_IS_OK(nt_status)) {
371 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
372 gensec_gssapi_state->sasl = true;
373 }
374 return nt_status;
375 }
376
377
378 /**
379 * Next state function for the GSSAPI GENSEC mechanism
380 *
381 * @param gensec_gssapi_state GSSAPI State
382 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
383 * @param in The request, as a DATA_BLOB
384 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
385 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
386 * or NT_STATUS_OK if the user is authenticated.
387 */
388
389 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
390 TALLOC_CTX *out_mem_ctx,
391 struct tevent_context *ev,
392 const DATA_BLOB in, DATA_BLOB *out)
393 {
394 struct gensec_gssapi_state *gensec_gssapi_state
395 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
396 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
397 OM_uint32 maj_stat, min_stat;
398 OM_uint32 min_stat2;
399 gss_buffer_desc input_token = { 0, NULL };
400 gss_buffer_desc output_token = { 0, NULL };
401
402 gss_OID gss_oid_p = NULL;
403 OM_uint32 time_req = 0;
404 OM_uint32 time_rec = 0;
405 struct timeval tv;
406
407 time_req = gensec_setting_int(gensec_security->settings,
408 "gensec_gssapi", "requested_life_time",
409 time_req);
410
411 input_token.length = in.length;
412 input_token.value = in.data;
413
414 switch (gensec_gssapi_state->sasl_state) {
415 case STAGE_GSS_NEG:
416 {
417 switch (gensec_security->gensec_role) {
418 case GENSEC_CLIENT:
419 {
420 #ifdef SAMBA4_USES_HEIMDAL
421 struct gsskrb5_send_to_kdc send_to_kdc;
422 krb5_error_code ret;
423 #endif
424
425 nt_status = gensec_gssapi_client_creds(gensec_security, ev);
426 if (!NT_STATUS_IS_OK(nt_status)) {
427 return nt_status;
428 }
429
430 #ifdef SAMBA4_USES_HEIMDAL
431 send_to_kdc.func = smb_krb5_send_and_recv_func;
432 send_to_kdc.ptr = ev;
433
434 min_stat = gsskrb5_set_send_to_kdc(&send_to_kdc);
435 if (min_stat) {
436 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
437 return NT_STATUS_INTERNAL_ERROR;
438 }
439 #endif
440 maj_stat = gss_init_sec_context(&min_stat,
441 gensec_gssapi_state->client_cred->creds,
442 &gensec_gssapi_state->gssapi_context,
443 gensec_gssapi_state->server_name,
444 gensec_gssapi_state->gss_oid,
445 gensec_gssapi_state->gss_want_flags,
446 time_req,
447 gensec_gssapi_state->input_chan_bindings,
448 &input_token,
449 &gss_oid_p,
450 &output_token,
451 &gensec_gssapi_state->gss_got_flags, /* ret flags */
452 &time_rec);
453 if (gss_oid_p) {
454 gensec_gssapi_state->gss_oid = gss_oid_p;
455 }
456
457 #ifdef SAMBA4_USES_HEIMDAL
458 send_to_kdc.func = smb_krb5_send_and_recv_func;
459 send_to_kdc.ptr = NULL;
460
461 ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
462 if (ret) {
463 DEBUG(1,("gensec_gssapi_update: gsskrb5_set_send_to_kdc failed\n"));
464 return NT_STATUS_INTERNAL_ERROR;
465 }
466 #endif
467 break;
468 }
469 case GENSEC_SERVER:
470 {
471 maj_stat = gss_accept_sec_context(&min_stat,
472 &gensec_gssapi_state->gssapi_context,
473 gensec_gssapi_state->server_cred->creds,
474 &input_token,
475 gensec_gssapi_state->input_chan_bindings,
476 &gensec_gssapi_state->client_name,
477 &gss_oid_p,
478 &output_token,
479 &gensec_gssapi_state->gss_got_flags,
480 &time_rec,
481 &gensec_gssapi_state->delegated_cred_handle);
482 if (gss_oid_p) {
483 gensec_gssapi_state->gss_oid = gss_oid_p;
484 }
485 break;
486 }
487 default:
488 return NT_STATUS_INVALID_PARAMETER;
489
490 }
491
492 gensec_gssapi_state->gss_exchange_count++;
493
494 if (maj_stat == GSS_S_COMPLETE) {
495 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
496 gss_release_buffer(&min_stat2, &output_token);
497
498 if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG &&
499 gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
500 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
501 } else {
502 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
503 }
504
505 tv = timeval_current_ofs(time_rec, 0);
506 gensec_gssapi_state->expire_time = timeval_to_nttime(&tv);
507
508 /* We may have been invoked as SASL, so there
509 * is more work to do */
510 if (gensec_gssapi_state->sasl) {
511 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
512 return NT_STATUS_MORE_PROCESSING_REQUIRED;
513 } else {
514 gensec_gssapi_state->sasl_state = STAGE_DONE;
515
516 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
517 DEBUG(5, ("GSSAPI Connection will be cryptographically sealed\n"));
518 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
519 DEBUG(5, ("GSSAPI Connection will be cryptographically signed\n"));
520 } else {
521 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
522 }
523
524 return NT_STATUS_OK;
525 }
526 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
527 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
528 gss_release_buffer(&min_stat2, &output_token);
529
530 return NT_STATUS_MORE_PROCESSING_REQUIRED;
531 } else if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
532 gss_cred_id_t creds = NULL;
533 gss_name_t name;
534 gss_buffer_desc buffer;
535 OM_uint32 lifetime = 0;
536 gss_cred_usage_t usage;
537 const char *role = NULL;
538 DEBUG(0, ("GSS %s Update(krb5)(%d) Update failed, credentials expired during GSSAPI handshake!\n",
539 role,
540 gensec_gssapi_state->gss_exchange_count));
541
542
543 switch (gensec_security->gensec_role) {
544 case GENSEC_CLIENT:
545 creds = gensec_gssapi_state->client_cred->creds;
546 role = "client";
547 break;
548 case GENSEC_SERVER:
549 creds = gensec_gssapi_state->server_cred->creds;
550 role = "server";
551 break;
552 }
553
554 maj_stat = gss_inquire_cred(&min_stat,
555 creds,
556 &name, &lifetime, &usage, NULL);
557
558 if (maj_stat == GSS_S_COMPLETE) {
559 const char *usage_string = NULL;
560 switch (usage) {
561 case GSS_C_BOTH:
562 usage_string = "GSS_C_BOTH";
563 break;
564 case GSS_C_ACCEPT:
565 usage_string = "GSS_C_ACCEPT";
566 break;
567 case GSS_C_INITIATE:
568 usage_string = "GSS_C_INITIATE";
569 break;
570 }
571 maj_stat = gss_display_name(&min_stat, name, &buffer, NULL);
572 if (maj_stat) {
573 buffer.value = NULL;
574 buffer.length = 0;
575 }
576 if (lifetime > 0) {
577 DEBUG(0, ("GSSAPI gss_inquire_cred indicates expiry of %*.*s in %u sec for %s\n",
578 (int)buffer.length, (int)buffer.length, (char *)buffer.value,
579 lifetime, usage_string));
580 } else {
581 DEBUG(0, ("GSSAPI gss_inquire_cred indicates %*.*s has already expired for %s\n",
582 (int)buffer.length, (int)buffer.length, (char *)buffer.value,
583 usage_string));
584 }
585 gss_release_buffer(&min_stat, &buffer);
586 gss_release_name(&min_stat, &name);
587 } else if (maj_stat != GSS_S_COMPLETE) {
588 DEBUG(0, ("inquiry of credential lifefime via GSSAPI gss_inquire_cred failed: %s\n",
589 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
590 }
591 return NT_STATUS_INVALID_PARAMETER;
592 } else if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
593 gss_mech_krb5)) {
594 switch (min_stat) {
595 case KRB5KRB_AP_ERR_TKT_NYV:
596 DEBUG(1, ("Error with ticket to contact %s: possible clock skew between us and the KDC or target server: %s\n",
597 gensec_gssapi_state->target_principal,
598 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
599 return NT_STATUS_TIME_DIFFERENCE_AT_DC; /* Make SPNEGO ignore us, we can't go any further here */
600 case KRB5KRB_AP_ERR_TKT_EXPIRED:
601 DEBUG(1, ("Error with ticket to contact %s: ticket is expired, possible clock skew between us and the KDC or target server: %s\n",
602 gensec_gssapi_state->target_principal,
603 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
604 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
605 case KRB5_KDC_UNREACH:
606 DEBUG(3, ("Cannot reach a KDC we require in order to obtain a ticket to %s: %s\n",
607 gensec_gssapi_state->target_principal,
608 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
609 return NT_STATUS_NO_LOGON_SERVERS; /* Make SPNEGO ignore us, we can't go any further here */
610 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
611 DEBUG(3, ("Server %s is not registered with our KDC: %s\n",
612 gensec_gssapi_state->target_principal,
613 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
614 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
615 case KRB5KRB_AP_ERR_MSG_TYPE:
616 /* garbage input, possibly from the auto-mech detection */
617 return NT_STATUS_INVALID_PARAMETER;
618 default:
619 DEBUG(1, ("GSS %s Update(krb5)(%d) Update failed: %s\n",
620 gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
621 gensec_gssapi_state->gss_exchange_count,
622 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
623 return NT_STATUS_LOGON_FAILURE;
624 }
625 } else {
626 DEBUG(1, ("GSS %s Update(%d) failed: %s\n",
627 gensec_security->gensec_role == GENSEC_CLIENT ? "client" : "server",
628 gensec_gssapi_state->gss_exchange_count,
629 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
630 return NT_STATUS_LOGON_FAILURE;
631 }
632 break;
633 }
634
635 /* These last two stages are only done if we were invoked as SASL */
636 case STAGE_SASL_SSF_NEG:
637 {
638 switch (gensec_security->gensec_role) {
639 case GENSEC_CLIENT:
640 {
641 uint8_t maxlength_proposed[4];
642 uint8_t maxlength_accepted[4];
643 uint8_t security_supported;
644 int conf_state;
645 gss_qop_t qop_state;
646 input_token.length = in.length;
647 input_token.value = in.data;
648
649 /* As a client, we have just send a
650 * zero-length blob to the server (after the
651 * normal GSSAPI exchange), and it has replied
652 * with it's SASL negotiation */
653
654 maj_stat = gss_unwrap(&min_stat,
655 gensec_gssapi_state->gssapi_context,
656 &input_token,
657 &output_token,
658 &conf_state,
659 &qop_state);
660 if (GSS_ERROR(maj_stat)) {
661 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
662 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
663 return NT_STATUS_ACCESS_DENIED;
664 }
665
666 if (output_token.length < 4) {
667 return NT_STATUS_INVALID_PARAMETER;
668 }
669
670 memcpy(maxlength_proposed, output_token.value, 4);
671 gss_release_buffer(&min_stat, &output_token);
672
673 /* first byte is the proposed security */
674 security_supported = maxlength_proposed[0];
675 maxlength_proposed[0] = '\0';
676
677 /* Rest is the proposed max wrap length */
678 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
679 gensec_gssapi_state->max_wrap_buf_size);
680 gensec_gssapi_state->sasl_protection = 0;
681 if (security_supported & NEG_SEAL) {
682 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
683 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
684 }
685 }
686 if (security_supported & NEG_SIGN) {
687 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
688 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
689 }
690 }
691 if (security_supported & NEG_NONE) {
692 gensec_gssapi_state->sasl_protection |= NEG_NONE;
693 }
694 if (gensec_gssapi_state->sasl_protection == 0) {
695 DEBUG(1, ("Remote server does not support unprotected connections\n"));
696 return NT_STATUS_ACCESS_DENIED;
697 }
698
699 /* Send back the negotiated max length */
700
701 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
702
703 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
704
705 input_token.value = maxlength_accepted;
706 input_token.length = sizeof(maxlength_accepted);
707
708 maj_stat = gss_wrap(&min_stat,
709 gensec_gssapi_state->gssapi_context,
710 false,
711 GSS_C_QOP_DEFAULT,
712 &input_token,
713 &conf_state,
714 &output_token);
715 if (GSS_ERROR(maj_stat)) {
716 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
717 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
718 return NT_STATUS_ACCESS_DENIED;
719 }
720
721 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
722 gss_release_buffer(&min_stat, &output_token);
723
724 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
725 gensec_gssapi_state->sasl_state = STAGE_DONE;
726
727 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
728 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically sealed\n"));
729 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
730 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographically signed\n"));
731 } else {
732 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographically protection\n"));
733 }
734
735 return NT_STATUS_OK;
736 }
737 case GENSEC_SERVER:
738 {
739 uint8_t maxlength_proposed[4];
740 uint8_t security_supported = 0x0;
741 int conf_state;
742
743 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
744 if (in.length != 0) {
745 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
746 }
747
748 /* Give the client some idea what we will support */
749
750 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
751 /* first byte is the proposed security */
752 maxlength_proposed[0] = '\0';
753
754 gensec_gssapi_state->sasl_protection = 0;
755 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
756 security_supported |= NEG_SEAL;
757 }
758 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
759 security_supported |= NEG_SIGN;
760 }
761 if (security_supported == 0) {
762 /* If we don't support anything, this must be 0 */
763 RSIVAL(maxlength_proposed, 0, 0x0);
764 }
765
766 /* TODO: We may not wish to support this */
767 security_supported |= NEG_NONE;
768 maxlength_proposed[0] = security_supported;
769
770 input_token.value = maxlength_proposed;
771 input_token.length = sizeof(maxlength_proposed);
772
773 maj_stat = gss_wrap(&min_stat,
774 gensec_gssapi_state->gssapi_context,
775 false,
776 GSS_C_QOP_DEFAULT,
777 &input_token,
778 &conf_state,
779 &output_token);
780 if (GSS_ERROR(maj_stat)) {
781 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
782 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
783 return NT_STATUS_ACCESS_DENIED;
784 }
785
786 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
787 gss_release_buffer(&min_stat, &output_token);
788
789 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
790 return NT_STATUS_MORE_PROCESSING_REQUIRED;
791 }
792 default:
793 return NT_STATUS_INVALID_PARAMETER;
794
795 }
796 }
797 /* This is s server-only stage */
798 case STAGE_SASL_SSF_ACCEPT:
799 {
800 uint8_t maxlength_accepted[4];
801 uint8_t security_accepted;
802 int conf_state;
803 gss_qop_t qop_state;
804 input_token.length = in.length;
805 input_token.value = in.data;
806
807 maj_stat = gss_unwrap(&min_stat,
808 gensec_gssapi_state->gssapi_context,
809 &input_token,
810 &output_token,
811 &conf_state,
812 &qop_state);
813 if (GSS_ERROR(maj_stat)) {
814 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
815 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
816 return NT_STATUS_ACCESS_DENIED;
817 }
818
819 if (output_token.length < 4) {
820 return NT_STATUS_INVALID_PARAMETER;
821 }
822
823 memcpy(maxlength_accepted, output_token.value, 4);
824 gss_release_buffer(&min_stat, &output_token);
825
826 /* first byte is the proposed security */
827 security_accepted = maxlength_accepted[0];
828 maxlength_accepted[0] = '\0';
829
830 /* Rest is the proposed max wrap length */
831 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
832 gensec_gssapi_state->max_wrap_buf_size);
833
834 gensec_gssapi_state->sasl_protection = 0;
835 if (security_accepted & NEG_SEAL) {
836 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
837 DEBUG(1, ("Remote client wanted seal, but gensec refused\n"));
838 return NT_STATUS_ACCESS_DENIED;
839 }
840 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
841 }
842 if (security_accepted & NEG_SIGN) {
843 if (!gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
844 DEBUG(1, ("Remote client wanted sign, but gensec refused\n"));
845 return NT_STATUS_ACCESS_DENIED;
846 }
847 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
848 }
849 if (security_accepted & NEG_NONE) {
850 gensec_gssapi_state->sasl_protection |= NEG_NONE;
851 }
852
853 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
854 gensec_gssapi_state->sasl_state = STAGE_DONE;
855 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
856 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically sealed\n"));
857 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
858 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographically signed\n"));
859 } else {
860 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
861 }
862
863 *out = data_blob(NULL, 0);
864 return NT_STATUS_OK;
865 }
866 default:
867 return NT_STATUS_INVALID_PARAMETER;
868 }
869 }
870
871 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
872 TALLOC_CTX *mem_ctx,
873 const DATA_BLOB *in,
874 DATA_BLOB *out)
875 {
876 struct gensec_gssapi_state *gensec_gssapi_state
877 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
878 OM_uint32 maj_stat, min_stat;
879 gss_buffer_desc input_token, output_token;
880 int conf_state;
881 input_token.length = in->length;
882 input_token.value = in->data;
883
884 maj_stat = gss_wrap(&min_stat,
885 gensec_gssapi_state->gssapi_context,
886 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
887 GSS_C_QOP_DEFAULT,
888 &input_token,
889 &conf_state,
890 &output_token);
891 if (GSS_ERROR(maj_stat)) {
892 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
893 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
894 return NT_STATUS_ACCESS_DENIED;
895 }
896
897 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
898 gss_release_buffer(&min_stat, &output_token);
899
900 if (gensec_gssapi_state->sasl) {
901 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
902 if (max_wrapped_size < out->length) {
903 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
904 (unsigned)in->length,
905 (unsigned)out->length,
906 (unsigned int)max_wrapped_size));
907 return NT_STATUS_INVALID_PARAMETER;
908 }
909 }
910
911 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
912 && !conf_state) {
913 return NT_STATUS_ACCESS_DENIED;
914 }
915 return NT_STATUS_OK;
916 }
917
918 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
919 TALLOC_CTX *mem_ctx,
920 const DATA_BLOB *in,
921 DATA_BLOB *out)
922 {
923 struct gensec_gssapi_state *gensec_gssapi_state
924 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
925 OM_uint32 maj_stat, min_stat;
926 gss_buffer_desc input_token, output_token;
927 int conf_state;
928 gss_qop_t qop_state;
929 input_token.length = in->length;
930 input_token.value = in->data;
931
932 if (gensec_gssapi_state->sasl) {
933 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
934 if (max_wrapped_size < in->length) {
935 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
936 return NT_STATUS_INVALID_PARAMETER;
937 }
938 }
939
940 maj_stat = gss_unwrap(&min_stat,
941 gensec_gssapi_state->gssapi_context,
942 &input_token,
943 &output_token,
944 &conf_state,
945 &qop_state);
946 if (GSS_ERROR(maj_stat)) {
947 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
948 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
949 return NT_STATUS_ACCESS_DENIED;
950 }
951
952 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
953 gss_release_buffer(&min_stat, &output_token);
954
955 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
956 && !conf_state) {
957 return NT_STATUS_ACCESS_DENIED;
958 }
959 return NT_STATUS_OK;
960 }
961
962 /* Find out the maximum input size negotiated on this connection */
963
964 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
965 {
966 struct gensec_gssapi_state *gensec_gssapi_state
967 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
968 OM_uint32 maj_stat, min_stat;
969 OM_uint32 max_input_size;
970
971 maj_stat = gss_wrap_size_limit(&min_stat,
972 gensec_gssapi_state->gssapi_context,
973 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
974 GSS_C_QOP_DEFAULT,
975 gensec_gssapi_state->max_wrap_buf_size,
976 &max_input_size);
977 if (GSS_ERROR(maj_stat)) {
978 TALLOC_CTX *mem_ctx = talloc_new(NULL);
979 DEBUG(1, ("gensec_gssapi_max_input_size: determining signature size with gss_wrap_size_limit failed: %s\n",
980 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
981 talloc_free(mem_ctx);
982 return 0;
983 }
984
985 return max_input_size;
986 }
987
988 /* Find out the maximum output size negotiated on this connection */
989 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
990 {
991 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
992 return gensec_gssapi_state->max_wrap_buf_size;
993 }
994
995 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
996 TALLOC_CTX *mem_ctx,
997 uint8_t *data, size_t length,
998 const uint8_t *whole_pdu, size_t pdu_length,
999 DATA_BLOB *sig)
1000 {
1001 struct gensec_gssapi_state *gensec_gssapi_state
1002 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1003 bool hdr_signing = false;
1004 size_t sig_size = 0;
1005 NTSTATUS status;
1006
1007 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1008 hdr_signing = true;
1009 }
1010
1011 sig_size = gensec_gssapi_sig_size(gensec_security, length);
1012
1013 status = gssapi_seal_packet(gensec_gssapi_state->gssapi_context,
1014 gensec_gssapi_state->gss_oid,
1015 hdr_signing, sig_size,
1016 data, length,
1017 whole_pdu, pdu_length,
1018 mem_ctx, sig);
1019 if (!NT_STATUS_IS_OK(status)) {
1020 DEBUG(0, ("gssapi_seal_packet(hdr_signing=%u,sig_size=%zu,"
1021 "data=%zu,pdu=%zu) failed: %s\n",
1022 hdr_signing, sig_size, length, pdu_length,
1023 nt_errstr(status)));
1024 return status;
1025 }
1026
1027 return NT_STATUS_OK;
1028 }
1029
1030 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
1031 uint8_t *data, size_t length,
1032 const uint8_t *whole_pdu, size_t pdu_length,
1033 const DATA_BLOB *sig)
1034 {
1035 struct gensec_gssapi_state *gensec_gssapi_state
1036 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1037 bool hdr_signing = false;
1038 NTSTATUS status;
1039
1040 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1041 hdr_signing = true;
1042 }
1043
1044 status = gssapi_unseal_packet(gensec_gssapi_state->gssapi_context,
1045 gensec_gssapi_state->gss_oid,
1046 hdr_signing,
1047 data, length,
1048 whole_pdu, pdu_length,
1049 sig);
1050 if (!NT_STATUS_IS_OK(status)) {
1051 DEBUG(0, ("gssapi_unseal_packet(hdr_signing=%u,sig_size=%zu,"
1052 "data=%zu,pdu=%zu) failed: %s\n",
1053 hdr_signing, sig->length, length, pdu_length,
1054 nt_errstr(status)));
1055 return status;
1056 }
1057
1058 return NT_STATUS_OK;
1059 }
1060
1061 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1062 TALLOC_CTX *mem_ctx,
1063 const uint8_t *data, size_t length,
1064 const uint8_t *whole_pdu, size_t pdu_length,
1065 DATA_BLOB *sig)
1066 {
1067 struct gensec_gssapi_state *gensec_gssapi_state
1068 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1069 bool hdr_signing = false;
1070 NTSTATUS status;
1071
1072 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1073 hdr_signing = true;
1074 }
1075
1076 status = gssapi_sign_packet(gensec_gssapi_state->gssapi_context,
1077 gensec_gssapi_state->gss_oid,
1078 hdr_signing,
1079 data, length,
1080 whole_pdu, pdu_length,
1081 mem_ctx, sig);
1082 if (!NT_STATUS_IS_OK(status)) {
1083 DEBUG(0, ("gssapi_sign_packet(hdr_signing=%u,"
1084 "data=%zu,pdu=%zu) failed: %s\n",
1085 hdr_signing, length, pdu_length,
1086 nt_errstr(status)));
1087 return status;
1088 }
1089
1090 return NT_STATUS_OK;
1091 }
1092
1093 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1094 const uint8_t *data, size_t length,
1095 const uint8_t *whole_pdu, size_t pdu_length,
1096 const DATA_BLOB *sig)
1097 {
1098 struct gensec_gssapi_state *gensec_gssapi_state
1099 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1100 bool hdr_signing = false;
1101 NTSTATUS status;
1102
1103 if (gensec_security->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1104 hdr_signing = true;
1105 }
1106
1107 status = gssapi_check_packet(gensec_gssapi_state->gssapi_context,
1108 gensec_gssapi_state->gss_oid,
1109 hdr_signing,
1110 data, length,
1111 whole_pdu, pdu_length,
1112 sig);
1113 if (!NT_STATUS_IS_OK(status)) {
1114 DEBUG(0, ("gssapi_check_packet(hdr_signing=%u,sig_size=%zu,"
1115 "data=%zu,pdu=%zu) failed: %s\n",
1116 hdr_signing, sig->length, length, pdu_length,
1117 nt_errstr(status)));
1118 return status;
1119 }
1120
1121 return NT_STATUS_OK;
1122 }
1123
1124 /* Try to figure out what features we actually got on the connection */
1125 static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1126 uint32_t feature)
1127 {
1128 struct gensec_gssapi_state *gensec_gssapi_state
1129 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1130 if (feature & GENSEC_FEATURE_SIGN) {
1131 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1132 if (gensec_gssapi_state->sasl
1133 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1134 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1135 && (gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG));
1136 }
1137 return gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG;
1138 }
1139 if (feature & GENSEC_FEATURE_SEAL) {
1140 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1141 if (gensec_gssapi_state->sasl
1142 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1143 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1144 && (gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG));
1145 }
1146 return gensec_gssapi_state->gss_got_flags & GSS_C_CONF_FLAG;
1147 }
1148 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1149 /* Only for GSSAPI/Krb5 */
1150 if (smb_gss_oid_equal(gensec_gssapi_state->gss_oid,
1151 gss_mech_krb5)) {
1152 return true;
1153 }
1154 }
1155 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1156 return gensec_gssapi_state->gss_got_flags & GSS_C_DCE_STYLE;
1157 }
1158 if (feature & GENSEC_FEATURE_NEW_SPNEGO) {
1159 NTSTATUS status;
1160 uint32_t keytype;
1161
1162 if (!(gensec_gssapi_state->gss_got_flags & GSS_C_INTEG_FLAG)) {
1163 return false;
1164 }
1165
1166 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "force_new_spnego", false)) {
1167 return true;
1168 }
1169 if (gensec_setting_bool(gensec_security->settings, "gensec_gssapi", "disable_new_spnego", false)) {
1170 return false;
1171 }
1172
1173 status = gssapi_get_session_key(gensec_gssapi_state,
1174 gensec_gssapi_state->gssapi_context, NULL, &keytype);
1175 /*
1176 * We should do a proper sig on the mechListMic unless
1177 * we know we have to be backwards compatible with
1178 * earlier windows versions.
1179 *
1180 * Negotiating a non-krb5
1181 * mech for example should be regarded as having
1182 * NEW_SPNEGO
1183 */
1184 if (NT_STATUS_IS_OK(status)) {
1185 switch (keytype) {
1186 case ENCTYPE_DES_CBC_CRC:
1187 case ENCTYPE_DES_CBC_MD5:
1188 case ENCTYPE_ARCFOUR_HMAC:
1189 case ENCTYPE_DES3_CBC_SHA1:
1190 return false;
1191 }
1192 }
1193 return true;
1194 }
1195 /* We can always do async (rather than strict request/reply) packets. */
1196 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1197 return true;
1198 }
1199 if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
1200 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
1201 return true;
1202 }
1203
1204 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
1205 return true;
1206 }
1207
1208 return false;
1209 }
1210 return false;
1211 }
1212
1213 static NTTIME gensec_gssapi_expire_time(struct gensec_security *gensec_security)
1214 {
1215 struct gensec_gssapi_state *gensec_gssapi_state =
1216 talloc_get_type_abort(gensec_security->private_data,
1217 struct gensec_gssapi_state);
1218
1219 return gensec_gssapi_state->expire_time;
1220 }
1221
1222 /*
1223 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1224 * (for encrypting some passwords).
1225 *
1226 * This breaks all the abstractions, but what do you expect...
1227 */
1228 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1229 TALLOC_CTX *mem_ctx,
1230 DATA_BLOB *session_key)
1231 {
1232 struct gensec_gssapi_state *gensec_gssapi_state
1233 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1234 return gssapi_get_session_key(mem_ctx, gensec_gssapi_state->gssapi_context, session_key, NULL);
1235 }
1236
1237 /* Get some basic (and authorization) information about the user on
1238 * this session. This uses either the PAC (if present) or a local
1239 * database lookup */
1240 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1241 TALLOC_CTX *mem_ctx,
1242 struct auth_session_info **_session_info)
1243 {
1244 NTSTATUS nt_status;
1245 TALLOC_CTX *tmp_ctx;
1246 struct gensec_gssapi_state *gensec_gssapi_state
1247 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1248 struct auth_session_info *session_info = NULL;
1249 OM_uint32 maj_stat, min_stat;
1250 DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
1251
1252 gss_buffer_desc name_token;
1253 char *principal_string;
1254
1255 tmp_ctx = talloc_named(mem_ctx, 0, "gensec_gssapi_session_info context");
1256 NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
1257
1258 maj_stat = gss_display_name (&min_stat,
1259 gensec_gssapi_state->client_name,
1260 &name_token,
1261 NULL);
1262 if (GSS_ERROR(maj_stat)) {
1263 DEBUG(1, ("GSS display_name failed: %s\n",
1264 gssapi_error_string(tmp_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1265 talloc_free(tmp_ctx);
1266 return NT_STATUS_FOOBAR;
1267 }
1268
1269 principal_string = talloc_strndup(tmp_ctx,
1270 (const char *)name_token.value,
1271 name_token.length);
1272
1273 gss_release_buffer(&min_stat, &name_token);
1274
1275 if (!principal_string) {
1276 talloc_free(tmp_ctx);
1277 return NT_STATUS_NO_MEMORY;
1278 }
1279
1280 nt_status = gssapi_obtain_pac_blob(tmp_ctx, gensec_gssapi_state->gssapi_context,
1281 gensec_gssapi_state->client_name,
1282 &pac_blob);
1283
1284 /* IF we have the PAC - otherwise we need to get this
1285 * data from elsewere - local ldb, or (TODO) lookup of some
1286 * kind...
1287 */
1288 if (NT_STATUS_IS_OK(nt_status)) {
1289 pac_blob_ptr = &pac_blob;
1290 }
1291 nt_status = gensec_generate_session_info_pac(tmp_ctx,
1292 gensec_security,
1293 gensec_gssapi_state->smb_krb5_context,
1294 pac_blob_ptr, principal_string,
1295 gensec_get_remote_address(gensec_security),
1296 &session_info);
1297 if (!NT_STATUS_IS_OK(nt_status)) {
1298 talloc_free(tmp_ctx);
1299 return nt_status;
1300 }
1301
1302 nt_status = gensec_gssapi_session_key(gensec_security, session_info, &session_info->session_key);
1303 if (!NT_STATUS_IS_OK(nt_status)) {
1304 talloc_free(tmp_ctx);
1305 return nt_status;
1306 }
1307
1308 if (gensec_gssapi_state->gss_got_flags & GSS_C_DELEG_FLAG &&
1309 gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
1310 krb5_error_code ret;
1311 const char *error_string;
1312
1313 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1314 session_info->credentials = cli_credentials_init(session_info);
1315 if (!session_info->credentials) {
1316 talloc_free(tmp_ctx);
1317 return NT_STATUS_NO_MEMORY;
1318 }
1319
1320 cli_credentials_set_conf(session_info->credentials, gensec_security->settings->lp_ctx);
1321 /* Just so we don't segfault trying to get at a username */
1322 cli_credentials_set_anonymous(session_info->credentials);
1323
1324 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1325 gensec_security->settings->lp_ctx,
1326 gensec_gssapi_state->delegated_cred_handle,
1327 CRED_SPECIFIED, &error_string);
1328 if (ret) {
1329 talloc_free(tmp_ctx);
1330 DEBUG(2,("Failed to get gss creds: %s\n", error_string));
1331 return NT_STATUS_NO_MEMORY;
1332 }
1333
1334 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1335 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1336
1337 /* It has been taken from this place... */
1338 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1339 } else {
1340 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1341 }
1342
1343 *_session_info = talloc_steal(mem_ctx, session_info);
1344 talloc_free(tmp_ctx);
1345
1346 return NT_STATUS_OK;
1347 }
1348
1349 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
1350 {
1351 struct gensec_gssapi_state *gensec_gssapi_state
1352 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1353 size_t sig_size;
1354
1355 if (gensec_gssapi_state->sig_size > 0) {
1356 return gensec_gssapi_state->sig_size;
1357 }
1358
1359 sig_size = gssapi_get_sig_size(gensec_gssapi_state->gssapi_context,
1360 gensec_gssapi_state->gss_oid,
1361 gensec_gssapi_state->gss_got_flags,
1362 data_size);
1363
1364 gensec_gssapi_state->sig_size = sig_size;
1365 return gensec_gssapi_state->sig_size;
1366 }
1367
1368 static const char *gensec_gssapi_krb5_oids[] = {
1369 GENSEC_OID_KERBEROS5_OLD,
1370 GENSEC_OID_KERBEROS5,
1371 NULL
1372 };
1373
1374 static const char *gensec_gssapi_spnego_oids[] = {
1375 GENSEC_OID_SPNEGO,
1376 NULL
1377 };
1378
1379 /* As a server, this could in theory accept any GSSAPI mech */
1380 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1381 .name = "gssapi_spnego",
1382 .sasl_name = "GSS-SPNEGO",
1383 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1384 .oid = gensec_gssapi_spnego_oids,
1385 .client_start = gensec_gssapi_client_start,
1386 .server_start = gensec_gssapi_server_start,
1387 .magic = gensec_magic_check_krb5_oid,
1388 .update = gensec_gssapi_update,
1389 .session_key = gensec_gssapi_session_key,
1390 .session_info = gensec_gssapi_session_info,
1391 .sign_packet = gensec_gssapi_sign_packet,
1392 .check_packet = gensec_gssapi_check_packet,
1393 .seal_packet = gensec_gssapi_seal_packet,
1394 .unseal_packet = gensec_gssapi_unseal_packet,
1395 .max_input_size = gensec_gssapi_max_input_size,
1396 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1397 .wrap = gensec_gssapi_wrap,
1398 .unwrap = gensec_gssapi_unwrap,
1399 .have_feature = gensec_gssapi_have_feature,
1400 .expire_time = gensec_gssapi_expire_time,
1401 .enabled = false,
1402 .kerberos = true,
1403 .priority = GENSEC_GSSAPI
1404 };
1405
1406 /* As a server, this could in theory accept any GSSAPI mech */
1407 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1408 .name = "gssapi_krb5",
1409 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1410 .oid = gensec_gssapi_krb5_oids,
1411 .client_start = gensec_gssapi_client_start,
1412 .server_start = gensec_gssapi_server_start,
1413 .magic = gensec_magic_check_krb5_oid,
1414 .update = gensec_gssapi_update,
1415 .session_key = gensec_gssapi_session_key,
1416 .session_info = gensec_gssapi_session_info,
1417 .sig_size = gensec_gssapi_sig_size,
1418 .sign_packet = gensec_gssapi_sign_packet,
1419 .check_packet = gensec_gssapi_check_packet,
1420 .seal_packet = gensec_gssapi_seal_packet,
1421 .unseal_packet = gensec_gssapi_unseal_packet,
1422 .max_input_size = gensec_gssapi_max_input_size,
1423 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1424 .wrap = gensec_gssapi_wrap,
1425 .unwrap = gensec_gssapi_unwrap,
1426 .have_feature = gensec_gssapi_have_feature,
1427 .expire_time = gensec_gssapi_expire_time,
1428 .enabled = true,
1429 .kerberos = true,
1430 .priority = GENSEC_GSSAPI
1431 };
1432
1433 /* As a server, this could in theory accept any GSSAPI mech */
1434 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1435 .name = "gssapi_krb5_sasl",
1436 .sasl_name = "GSSAPI",
1437 .client_start = gensec_gssapi_sasl_client_start,
1438 .server_start = gensec_gssapi_sasl_server_start,
1439 .update = gensec_gssapi_update,
1440 .session_key = gensec_gssapi_session_key,
1441 .session_info = gensec_gssapi_session_info,
1442 .max_input_size = gensec_gssapi_max_input_size,
1443 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1444 .wrap = gensec_gssapi_wrap,
1445 .unwrap = gensec_gssapi_unwrap,
1446 .have_feature = gensec_gssapi_have_feature,
1447 .expire_time = gensec_gssapi_expire_time,
1448 .enabled = true,
1449 .kerberos = true,
1450 .priority = GENSEC_GSSAPI
1451 };
1452
1453 _PUBLIC_ NTSTATUS gensec_gssapi_init(void)
1454 {
1455 NTSTATUS ret;
1456
1457 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1458 if (!NT_STATUS_IS_OK(ret)) {
1459 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1460 gensec_gssapi_spnego_security_ops.name));
1461 return ret;
1462 }
1463
1464 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1465 if (!NT_STATUS_IS_OK(ret)) {
1466 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1467 gensec_gssapi_krb5_security_ops.name));
1468 return ret;
1469 }
1470
1471 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1472 if (!NT_STATUS_IS_OK(ret)) {
1473 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1474 gensec_gssapi_sasl_krb5_security_ops.name));
1475 return ret;
1476 }
1477
1478 return ret;
1479 }
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