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r19660: Forgot to tell gsskrb5 not to canonicalize hostnames. Shoudl fix
[Samba.git] / source4 / auth / gensec / gensec_gssapi.c
blob8140cfa44b5187ff9cc8b663462aaacd6a70758a
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 2 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, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25 #include "includes.h"
26 #include "system/kerberos.h"
27 #include "heimdal/lib/gssapi/gssapi/gssapi.h"
28 #include "auth/kerberos/kerberos.h"
29 #include "librpc/gen_ndr/krb5pac.h"
30 #include "auth/auth.h"
31 #include "lib/ldb/include/ldb.h"
32 #include "auth/auth_sam.h"
33 #include "librpc/rpc/dcerpc.h"
34 #include "auth/credentials/credentials.h"
35 #include "auth/credentials/credentials_krb5.h"
36 #include "auth/gensec/gensec.h"
37
38 enum gensec_gssapi_sasl_state
39 {
40 STAGE_GSS_NEG,
41 STAGE_SASL_SSF_NEG,
42 STAGE_SASL_SSF_ACCEPT,
43 STAGE_DONE
44 };
45
46 #define NEG_SEAL 0x4
47 #define NEG_SIGN 0x2
48 #define NEG_NONE 0x1
49
50 struct gensec_gssapi_state {
51 gss_ctx_id_t gssapi_context;
52 struct gss_channel_bindings_struct *input_chan_bindings;
53 gss_name_t server_name;
54 gss_name_t client_name;
55 OM_uint32 want_flags, got_flags;
56 const gss_OID_desc *gss_oid;
57
58 DATA_BLOB session_key;
59 DATA_BLOB pac;
60
61 struct smb_krb5_context *smb_krb5_context;
62 struct gssapi_creds_container *client_cred;
63 struct gssapi_creds_container *server_cred;
64
65 gss_cred_id_t delegated_cred_handle;
66
67 BOOL sasl; /* We have two different mechs in this file: One
68 * for SASL wrapped GSSAPI and another for normal
69 * GSSAPI */
70 enum gensec_gssapi_sasl_state sasl_state;
71 uint8_t sasl_protection; /* What was negotiated at the SASL
72 * layer, independent of the GSSAPI
73 * layer... */
74
75 size_t max_wrap_buf_size;
76 int gss_exchange_count;
77 };
78
79 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
80 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
81
82 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
83 OM_uint32 maj_stat, OM_uint32 min_stat,
84 const gss_OID_desc *mech)
85 {
86 OM_uint32 disp_min_stat, disp_maj_stat;
87 gss_buffer_desc maj_error_message;
88 gss_buffer_desc min_error_message;
89 OM_uint32 msg_ctx = 0;
90
91 char *ret;
92
93 maj_error_message.value = NULL;
94 min_error_message.value = NULL;
95
96 disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
97 mech, &msg_ctx, &maj_error_message);
98 disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
99 mech, &msg_ctx, &min_error_message);
100 ret = talloc_asprintf(mem_ctx, "%s: %s", (char *)maj_error_message.value, (char *)min_error_message.value);
101
102 gss_release_buffer(&disp_min_stat, &maj_error_message);
103 gss_release_buffer(&disp_min_stat, &min_error_message);
104
105 return ret;
106 }
107
108
109 static int gensec_gssapi_destory(struct gensec_gssapi_state *gensec_gssapi_state)
110 {
111 OM_uint32 maj_stat, min_stat;
112
113 if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
114 maj_stat = gss_release_cred(&min_stat,
115 &gensec_gssapi_state->delegated_cred_handle);
116 }
117
118 if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
119 maj_stat = gss_delete_sec_context (&min_stat,
120 &gensec_gssapi_state->gssapi_context,
121 GSS_C_NO_BUFFER);
122 }
123
124 if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
125 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
126 }
127 if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
128 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
129 }
130 return 0;
131 }
132
133 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
134 {
135 struct gensec_gssapi_state *gensec_gssapi_state;
136 krb5_error_code ret;
137 struct gsskrb5_send_to_kdc send_to_kdc;
138
139 gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
140 if (!gensec_gssapi_state) {
141 return NT_STATUS_NO_MEMORY;
142 }
143
144 gensec_gssapi_state->gss_exchange_count = 0;
145 gensec_gssapi_state->max_wrap_buf_size
146 = lp_parm_int(-1, "gensec_gssapi", "max wrap buf size", 65536);
147
148 gensec_gssapi_state->sasl = False;
149 gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
150
151 gensec_security->private_data = gensec_gssapi_state;
152
153 gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
154 gensec_gssapi_state->server_name = GSS_C_NO_NAME;
155 gensec_gssapi_state->client_name = GSS_C_NO_NAME;
156
157 /* TODO: Fill in channel bindings */
158 gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
159
160 gensec_gssapi_state->want_flags = 0;
161 if (lp_parm_bool(-1, "gensec_gssapi", "mutual", True)) {
162 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
163 }
164 if (lp_parm_bool(-1, "gensec_gssapi", "delegation", True)) {
165 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
166 }
167 if (lp_parm_bool(-1, "gensec_gssapi", "replay", True)) {
168 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
169 }
170 if (lp_parm_bool(-1, "gensec_gssapi", "sequence", True)) {
171 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
172 }
173
174 gensec_gssapi_state->got_flags = 0;
175
176 gensec_gssapi_state->session_key = data_blob(NULL, 0);
177 gensec_gssapi_state->pac = data_blob(NULL, 0);
178
179 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
180
181 talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destory);
182
183 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
184 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
185 }
186 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
187 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
188 }
189 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
190 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
191 }
192
193 gensec_gssapi_state->gss_oid = GSS_C_NULL_OID;
194
195 send_to_kdc.func = smb_krb5_send_and_recv_func;
196 send_to_kdc.ptr = gensec_security->event_ctx;
197
198 ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
199 if (ret) {
200 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
201 talloc_free(gensec_gssapi_state);
202 return NT_STATUS_INTERNAL_ERROR;
203 }
204 if (lp_realm() && *lp_realm()) {
205 char *upper_realm = strupper_talloc(gensec_gssapi_state, lp_realm());
206 if (!upper_realm) {
207 DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm()));
208 talloc_free(gensec_gssapi_state);
209 return NT_STATUS_NO_MEMORY;
210 }
211 ret = gsskrb5_set_default_realm(upper_realm);
212 talloc_free(upper_realm);
213 if (ret) {
214 DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
215 talloc_free(gensec_gssapi_state);
216 return NT_STATUS_INTERNAL_ERROR;
217 }
218 }
219
220 /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
221 ret = gsskrb5_set_dns_canonicalize(FALSE);
222 if (ret) {
223 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
224 talloc_free(gensec_gssapi_state);
225 return NT_STATUS_INTERNAL_ERROR;
226 }
227
228 ret = smb_krb5_init_context(gensec_gssapi_state,
229 &gensec_gssapi_state->smb_krb5_context);
230 if (ret) {
231 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
232 error_message(ret)));
233 talloc_free(gensec_gssapi_state);
234 return NT_STATUS_INTERNAL_ERROR;
235 }
236 return NT_STATUS_OK;
237 }
238
239 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
240 {
241 NTSTATUS nt_status;
242 int ret;
243 struct gensec_gssapi_state *gensec_gssapi_state;
244 struct cli_credentials *machine_account;
245 struct gssapi_creds_container *gcc;
246
247 nt_status = gensec_gssapi_start(gensec_security);
248 if (!NT_STATUS_IS_OK(nt_status)) {
249 return nt_status;
250 }
251
252 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
253
254 machine_account = gensec_get_credentials(gensec_security);
255
256 if (!machine_account) {
257 DEBUG(3, ("No machine account credentials specified\n"));
258 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
259 } else {
260 ret = cli_credentials_get_server_gss_creds(machine_account, &gcc);
261 if (ret) {
262 DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
263 error_message(ret)));
264 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
265 }
266 }
267
268 gensec_gssapi_state->server_cred = gcc;
269 return NT_STATUS_OK;
270
271 }
272
273 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
274 {
275 NTSTATUS nt_status;
276 struct gensec_gssapi_state *gensec_gssapi_state;
277 nt_status = gensec_gssapi_server_start(gensec_security);
278
279 if (NT_STATUS_IS_OK(nt_status)) {
280 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
281 gensec_gssapi_state->sasl = True;
282 }
283 return nt_status;
284 }
285
286 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
287 {
288 struct gensec_gssapi_state *gensec_gssapi_state;
289 struct cli_credentials *creds = gensec_get_credentials(gensec_security);
290 krb5_error_code ret;
291 NTSTATUS nt_status;
292 gss_buffer_desc name_token;
293 gss_OID name_type;
294 OM_uint32 maj_stat, min_stat;
295 const char *hostname = gensec_get_target_hostname(gensec_security);
296 const char *principal;
297 struct gssapi_creds_container *gcc;
298
299 if (!hostname) {
300 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
301 return NT_STATUS_INVALID_PARAMETER;
302 }
303 if (is_ipaddress(hostname)) {
304 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
305 return NT_STATUS_INVALID_PARAMETER;
306 }
307 if (strcmp(hostname, "localhost") == 0) {
308 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
309 return NT_STATUS_INVALID_PARAMETER;
310 }
311
312 nt_status = gensec_gssapi_start(gensec_security);
313 if (!NT_STATUS_IS_OK(nt_status)) {
314 return nt_status;
315 }
316
317 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
318
319 gensec_gssapi_state->gss_oid = gss_mech_krb5;
320
321 principal = gensec_get_target_principal(gensec_security);
322 if (principal && lp_client_use_spnego_principal()) {
323 name_token.value = discard_const_p(uint8_t, principal);
324 name_token.length = strlen(principal);
325
326 name_type = GSS_C_NULL_OID;
327 } else {
328 principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
329 gensec_get_target_service(gensec_security),
330 hostname);
331
332 name_token.value = discard_const_p(uint8_t, principal);
333 name_token.length = strlen(principal);
334
335 name_type = GSS_C_NT_HOSTBASED_SERVICE;
336 }
337
338 maj_stat = gss_import_name (&min_stat,
339 &name_token,
340 name_type,
341 &gensec_gssapi_state->server_name);
342 if (maj_stat) {
343 DEBUG(2, ("GSS Import name of %s failed: %s\n",
344 (char *)name_token.value,
345 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
346 return NT_STATUS_INVALID_PARAMETER;
347 }
348
349 ret = cli_credentials_get_client_gss_creds(creds, &gcc);
350 switch (ret) {
351 case 0:
352 break;
353 case KRB5_KDC_UNREACH:
354 DEBUG(3, ("Cannot reach a KDC we require\n"));
355 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
356 default:
357 DEBUG(1, ("Aquiring initiator credentails failed\n"));
358 return NT_STATUS_UNSUCCESSFUL;
359 }
360
361 gensec_gssapi_state->client_cred = gcc;
362
363 return NT_STATUS_OK;
364 }
365
366 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
367 {
368 NTSTATUS nt_status;
369 struct gensec_gssapi_state *gensec_gssapi_state;
370 nt_status = gensec_gssapi_client_start(gensec_security);
371
372 if (NT_STATUS_IS_OK(nt_status)) {
373 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
374 gensec_gssapi_state->sasl = True;
375 }
376 return nt_status;
377 }
378
379
380 /**
381 * Check if the packet is one for this mechansim
382 *
383 * @param gensec_security GENSEC state
384 * @param in The request, as a DATA_BLOB
385 * @return Error, INVALID_PARAMETER if it's not a packet for us
386 * or NT_STATUS_OK if the packet is ok.
387 */
388
389 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
390 const DATA_BLOB *in)
391 {
392 if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
393 return NT_STATUS_OK;
394 } else {
395 return NT_STATUS_INVALID_PARAMETER;
396 }
397 }
398
399
400 /**
401 * Next state function for the GSSAPI GENSEC mechanism
402 *
403 * @param gensec_gssapi_state GSSAPI State
404 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
405 * @param in The request, as a DATA_BLOB
406 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
407 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
408 * or NT_STATUS_OK if the user is authenticated.
409 */
410
411 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
412 TALLOC_CTX *out_mem_ctx,
413 const DATA_BLOB in, DATA_BLOB *out)
414 {
415 struct gensec_gssapi_state *gensec_gssapi_state
416 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
417 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
418 OM_uint32 maj_stat, min_stat;
419 OM_uint32 min_stat2;
420 gss_buffer_desc input_token, output_token;
421 gss_OID gss_oid_p = NULL;
422 input_token.length = in.length;
423 input_token.value = in.data;
424
425 switch (gensec_gssapi_state->sasl_state) {
426 case STAGE_GSS_NEG:
427 {
428 switch (gensec_security->gensec_role) {
429 case GENSEC_CLIENT:
430 {
431 maj_stat = gss_init_sec_context(&min_stat,
432 gensec_gssapi_state->client_cred->creds,
433 &gensec_gssapi_state->gssapi_context,
434 gensec_gssapi_state->server_name,
435 discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
436 gensec_gssapi_state->want_flags,
437 0,
438 gensec_gssapi_state->input_chan_bindings,
439 &input_token,
440 &gss_oid_p,
441 &output_token,
442 &gensec_gssapi_state->got_flags, /* ret flags */
443 NULL);
444 if (gss_oid_p) {
445 gensec_gssapi_state->gss_oid = gss_oid_p;
446 }
447 break;
448 }
449 case GENSEC_SERVER:
450 {
451 maj_stat = gss_accept_sec_context(&min_stat,
452 &gensec_gssapi_state->gssapi_context,
453 gensec_gssapi_state->server_cred->creds,
454 &input_token,
455 gensec_gssapi_state->input_chan_bindings,
456 &gensec_gssapi_state->client_name,
457 &gss_oid_p,
458 &output_token,
459 &gensec_gssapi_state->got_flags,
460 NULL,
461 &gensec_gssapi_state->delegated_cred_handle);
462 if (gss_oid_p) {
463 gensec_gssapi_state->gss_oid = gss_oid_p;
464 }
465 break;
466 }
467 default:
468 return NT_STATUS_INVALID_PARAMETER;
469
470 }
471
472 gensec_gssapi_state->gss_exchange_count++;
473
474 if (maj_stat == GSS_S_COMPLETE) {
475 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
476 gss_release_buffer(&min_stat2, &output_token);
477
478 if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
479 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
480 } else {
481 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
482 }
483
484 /* We may have been invoked as SASL, so there
485 * is more work to do */
486 if (gensec_gssapi_state->sasl) {
487 /* Due to a very subtle interaction
488 * with SASL and the LDAP libs, we
489 * must ensure the data pointer is
490 * != NULL, but the length is 0.
491 *
492 * This ensures we send a 'zero
493 * length' (rather than NULL) response
494 */
495
496 if (!out->data) {
497 out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
498 }
499
500 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
501 return NT_STATUS_MORE_PROCESSING_REQUIRED;
502 } else {
503 gensec_gssapi_state->sasl_state = STAGE_DONE;
504
505 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
506 DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
507 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
508 DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
509 } else {
510 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
511 }
512
513 return NT_STATUS_OK;
514 }
515 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
516 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
517 gss_release_buffer(&min_stat2, &output_token);
518
519 return NT_STATUS_MORE_PROCESSING_REQUIRED;
520 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
521 switch (min_stat) {
522 case KRB5_KDC_UNREACH:
523 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
524 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
525 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
526 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
527 DEBUG(3, ("Server is not registered with our KDC: %s\n",
528 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
529 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
530 case KRB5KRB_AP_ERR_MSG_TYPE:
531 /* garbage input, possibly from the auto-mech detection */
532 return NT_STATUS_INVALID_PARAMETER;
533 default:
534 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
535 gensec_gssapi_state->gss_exchange_count,
536 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
537 return nt_status;
538 }
539 } else {
540 DEBUG(1, ("GSS Update(%d) failed: %s\n",
541 gensec_gssapi_state->gss_exchange_count,
542 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
543 return nt_status;
544 }
545 break;
546 }
547
548 /* These last two stages are only done if we were invoked as SASL */
549 case STAGE_SASL_SSF_NEG:
550 {
551 switch (gensec_security->gensec_role) {
552 case GENSEC_CLIENT:
553 {
554 uint8_t maxlength_proposed[4];
555 uint8_t maxlength_accepted[4];
556 uint8_t security_supported;
557 int conf_state;
558 gss_qop_t qop_state;
559 input_token.length = in.length;
560 input_token.value = in.data;
561
562 /* As a client, we have just send a
563 * zero-length blob to the server (after the
564 * normal GSSAPI exchange), and it has replied
565 * with it's SASL negotiation */
566
567 maj_stat = gss_unwrap(&min_stat,
568 gensec_gssapi_state->gssapi_context,
569 &input_token,
570 &output_token,
571 &conf_state,
572 &qop_state);
573 if (GSS_ERROR(maj_stat)) {
574 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
575 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
576 return NT_STATUS_ACCESS_DENIED;
577 }
578
579 if (output_token.length < 4) {
580 return NT_STATUS_INVALID_PARAMETER;
581 }
582
583 memcpy(maxlength_proposed, output_token.value, 4);
584 gss_release_buffer(&min_stat, &output_token);
585
586 /* first byte is the proposed security */
587 security_supported = maxlength_proposed[0];
588 maxlength_proposed[0] = '\0';
589
590 /* Rest is the proposed max wrap length */
591 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
592 gensec_gssapi_state->max_wrap_buf_size);
593 gensec_gssapi_state->sasl_protection = 0;
594 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
595 if (security_supported & NEG_SEAL) {
596 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
597 }
598 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
599 if (security_supported & NEG_SIGN) {
600 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
601 }
602 } else if (security_supported & NEG_NONE) {
603 gensec_gssapi_state->sasl_protection |= NEG_NONE;
604 } else {
605 DEBUG(1, ("Remote server does not support unprotected connections"));
606 return NT_STATUS_ACCESS_DENIED;
607 }
608
609 /* Send back the negotiated max length */
610
611 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
612
613 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
614
615 input_token.value = maxlength_accepted;
616 input_token.length = sizeof(maxlength_accepted);
617
618 maj_stat = gss_wrap(&min_stat,
619 gensec_gssapi_state->gssapi_context,
620 False,
621 GSS_C_QOP_DEFAULT,
622 &input_token,
623 &conf_state,
624 &output_token);
625 if (GSS_ERROR(maj_stat)) {
626 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
627 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
628 return NT_STATUS_ACCESS_DENIED;
629 }
630
631 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
632 gss_release_buffer(&min_stat, &output_token);
633
634 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
635 gensec_gssapi_state->sasl_state = STAGE_DONE;
636
637 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
638 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
639 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
640 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
641 } else {
642 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
643 }
644
645 return NT_STATUS_OK;
646 }
647 case GENSEC_SERVER:
648 {
649 uint8_t maxlength_proposed[4];
650 uint8_t security_supported = 0x0;
651 int conf_state;
652
653 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
654 if (in.length != 0) {
655 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
656 }
657
658 /* Give the client some idea what we will support */
659
660 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
661 /* first byte is the proposed security */
662 maxlength_proposed[0] = '\0';
663
664 gensec_gssapi_state->sasl_protection = 0;
665 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
666 security_supported |= NEG_SEAL;
667 }
668 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
669 security_supported |= NEG_SIGN;
670 }
671 if (security_supported == 0) {
672 /* If we don't support anything, this must be 0 */
673 RSIVAL(maxlength_proposed, 0, 0x0);
674 }
675
676 /* TODO: We may not wish to support this */
677 security_supported |= NEG_NONE;
678 maxlength_proposed[0] = security_supported;
679
680 input_token.value = maxlength_proposed;
681 input_token.length = sizeof(maxlength_proposed);
682
683 maj_stat = gss_wrap(&min_stat,
684 gensec_gssapi_state->gssapi_context,
685 False,
686 GSS_C_QOP_DEFAULT,
687 &input_token,
688 &conf_state,
689 &output_token);
690 if (GSS_ERROR(maj_stat)) {
691 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
692 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
693 return NT_STATUS_ACCESS_DENIED;
694 }
695
696 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
697 gss_release_buffer(&min_stat, &output_token);
698
699 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
700 return NT_STATUS_MORE_PROCESSING_REQUIRED;
701 }
702 default:
703 return NT_STATUS_INVALID_PARAMETER;
704
705 }
706 }
707 /* This is s server-only stage */
708 case STAGE_SASL_SSF_ACCEPT:
709 {
710 uint8_t maxlength_accepted[4];
711 uint8_t security_accepted;
712 int conf_state;
713 gss_qop_t qop_state;
714 input_token.length = in.length;
715 input_token.value = in.data;
716
717 maj_stat = gss_unwrap(&min_stat,
718 gensec_gssapi_state->gssapi_context,
719 &input_token,
720 &output_token,
721 &conf_state,
722 &qop_state);
723 if (GSS_ERROR(maj_stat)) {
724 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
725 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
726 return NT_STATUS_ACCESS_DENIED;
727 }
728
729 if (output_token.length < 4) {
730 return NT_STATUS_INVALID_PARAMETER;
731 }
732
733 memcpy(maxlength_accepted, output_token.value, 4);
734 gss_release_buffer(&min_stat, &output_token);
735
736 /* first byte is the proposed security */
737 security_accepted = maxlength_accepted[0];
738 maxlength_accepted[0] = '\0';
739
740 /* Rest is the proposed max wrap length */
741 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
742 gensec_gssapi_state->max_wrap_buf_size);
743
744 gensec_gssapi_state->sasl_protection = 0;
745 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
746 if (security_accepted & NEG_SEAL) {
747 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
748 }
749 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
750 if (security_accepted & NEG_SIGN) {
751 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
752 }
753 } else if (security_accepted & NEG_NONE) {
754 gensec_gssapi_state->sasl_protection |= NEG_NONE;
755 } else {
756 DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
757 return NT_STATUS_ACCESS_DENIED;
758 }
759
760 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
761 gensec_gssapi_state->sasl_state = STAGE_DONE;
762 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
763 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
764 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
765 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
766 } else {
767 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
768 }
769
770 *out = data_blob(NULL, 0);
771 return NT_STATUS_OK;
772 }
773 default:
774 return NT_STATUS_INVALID_PARAMETER;
775 }
776 }
777
778 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
779 TALLOC_CTX *mem_ctx,
780 const DATA_BLOB *in,
781 DATA_BLOB *out)
782 {
783 struct gensec_gssapi_state *gensec_gssapi_state
784 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
785 OM_uint32 maj_stat, min_stat;
786 gss_buffer_desc input_token, output_token;
787 int conf_state;
788 input_token.length = in->length;
789 input_token.value = in->data;
790
791 maj_stat = gss_wrap(&min_stat,
792 gensec_gssapi_state->gssapi_context,
793 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
794 GSS_C_QOP_DEFAULT,
795 &input_token,
796 &conf_state,
797 &output_token);
798 if (GSS_ERROR(maj_stat)) {
799 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
800 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
801 return NT_STATUS_ACCESS_DENIED;
802 }
803
804 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
805 gss_release_buffer(&min_stat, &output_token);
806
807 if (gensec_gssapi_state->sasl) {
808 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
809 if (max_wrapped_size < out->length) {
810 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
811 (unsigned)in->length,
812 (unsigned)out->length,
813 (unsigned int)max_wrapped_size));
814 return NT_STATUS_INVALID_PARAMETER;
815 }
816 }
817
818 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
819 && !conf_state) {
820 return NT_STATUS_ACCESS_DENIED;
821 }
822 return NT_STATUS_OK;
823 }
824
825 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
826 TALLOC_CTX *mem_ctx,
827 const DATA_BLOB *in,
828 DATA_BLOB *out)
829 {
830 struct gensec_gssapi_state *gensec_gssapi_state
831 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
832 OM_uint32 maj_stat, min_stat;
833 gss_buffer_desc input_token, output_token;
834 int conf_state;
835 gss_qop_t qop_state;
836 input_token.length = in->length;
837 input_token.value = in->data;
838
839 if (gensec_gssapi_state->sasl) {
840 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
841 if (max_wrapped_size < in->length) {
842 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
843 return NT_STATUS_INVALID_PARAMETER;
844 }
845 }
846
847 maj_stat = gss_unwrap(&min_stat,
848 gensec_gssapi_state->gssapi_context,
849 &input_token,
850 &output_token,
851 &conf_state,
852 &qop_state);
853 if (GSS_ERROR(maj_stat)) {
854 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
855 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
856 return NT_STATUS_ACCESS_DENIED;
857 }
858
859 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
860 gss_release_buffer(&min_stat, &output_token);
861
862 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
863 && !conf_state) {
864 return NT_STATUS_ACCESS_DENIED;
865 }
866 return NT_STATUS_OK;
867 }
868
869 /* Find out the maximum input size negotiated on this connection */
870
871 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
872 {
873 struct gensec_gssapi_state *gensec_gssapi_state
874 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
875 OM_uint32 maj_stat, min_stat;
876 OM_uint32 max_input_size;
877
878 maj_stat = gss_wrap_size_limit(&min_stat,
879 gensec_gssapi_state->gssapi_context,
880 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
881 GSS_C_QOP_DEFAULT,
882 gensec_gssapi_state->max_wrap_buf_size,
883 &max_input_size);
884 if (GSS_ERROR(maj_stat)) {
885 TALLOC_CTX *mem_ctx = talloc_new(NULL);
886 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
887 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
888 talloc_free(mem_ctx);
889 return 0;
890 }
891
892 return max_input_size;
893 }
894
895 /* Find out the maximum output size negotiated on this connection */
896 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
897 {
898 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
899 return gensec_gssapi_state->max_wrap_buf_size;
900 }
901
902 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
903 TALLOC_CTX *mem_ctx,
904 uint8_t *data, size_t length,
905 const uint8_t *whole_pdu, size_t pdu_length,
906 DATA_BLOB *sig)
907 {
908 struct gensec_gssapi_state *gensec_gssapi_state
909 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
910 OM_uint32 maj_stat, min_stat;
911 gss_buffer_desc input_token, output_token;
912 int conf_state;
913 ssize_t sig_length;
914
915 input_token.length = length;
916 input_token.value = data;
917
918 maj_stat = gss_wrap(&min_stat,
919 gensec_gssapi_state->gssapi_context,
920 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
921 GSS_C_QOP_DEFAULT,
922 &input_token,
923 &conf_state,
924 &output_token);
925 if (GSS_ERROR(maj_stat)) {
926 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
927 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
928 return NT_STATUS_ACCESS_DENIED;
929 }
930
931 if (output_token.length < input_token.length) {
932 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
933 (long)output_token.length, (long)length));
934 return NT_STATUS_INTERNAL_ERROR;
935 }
936 sig_length = output_token.length - input_token.length;
937
938 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
939 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
940
941 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
942 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
943 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
944
945 gss_release_buffer(&min_stat, &output_token);
946
947 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
948 && !conf_state) {
949 return NT_STATUS_ACCESS_DENIED;
950 }
951 return NT_STATUS_OK;
952 }
953
954 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
955 TALLOC_CTX *mem_ctx,
956 uint8_t *data, size_t length,
957 const uint8_t *whole_pdu, size_t pdu_length,
958 const DATA_BLOB *sig)
959 {
960 struct gensec_gssapi_state *gensec_gssapi_state
961 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
962 OM_uint32 maj_stat, min_stat;
963 gss_buffer_desc input_token, output_token;
964 int conf_state;
965 gss_qop_t qop_state;
966 DATA_BLOB in;
967
968 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
969
970 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
971
972 memcpy(in.data, sig->data, sig->length);
973 memcpy(in.data + sig->length, data, length);
974
975 input_token.length = in.length;
976 input_token.value = in.data;
977
978 maj_stat = gss_unwrap(&min_stat,
979 gensec_gssapi_state->gssapi_context,
980 &input_token,
981 &output_token,
982 &conf_state,
983 &qop_state);
984 if (GSS_ERROR(maj_stat)) {
985 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
986 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
987 return NT_STATUS_ACCESS_DENIED;
988 }
989
990 if (output_token.length != length) {
991 return NT_STATUS_INTERNAL_ERROR;
992 }
993
994 memcpy(data, output_token.value, length);
995
996 gss_release_buffer(&min_stat, &output_token);
997
998 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
999 && !conf_state) {
1000 return NT_STATUS_ACCESS_DENIED;
1001 }
1002 return NT_STATUS_OK;
1003 }
1004
1005 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1006 TALLOC_CTX *mem_ctx,
1007 const uint8_t *data, size_t length,
1008 const uint8_t *whole_pdu, size_t pdu_length,
1009 DATA_BLOB *sig)
1010 {
1011 struct gensec_gssapi_state *gensec_gssapi_state
1012 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1013 OM_uint32 maj_stat, min_stat;
1014 gss_buffer_desc input_token, output_token;
1015 int conf_state;
1016 ssize_t sig_length = 0;
1017
1018 input_token.length = length;
1019 input_token.value = discard_const_p(uint8_t *, data);
1020
1021 maj_stat = gss_wrap(&min_stat,
1022 gensec_gssapi_state->gssapi_context,
1023 0,
1024 GSS_C_QOP_DEFAULT,
1025 &input_token,
1026 &conf_state,
1027 &output_token);
1028 if (GSS_ERROR(maj_stat)) {
1029 DEBUG(1, ("GSS Wrap failed: %s\n",
1030 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1031 return NT_STATUS_ACCESS_DENIED;
1032 }
1033
1034 if (output_token.length < input_token.length) {
1035 DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1036 (long)output_token.length, (long)length));
1037 return NT_STATUS_INTERNAL_ERROR;
1038 }
1039
1040 /* Caller must pad to right boundary */
1041 sig_length = output_token.length - input_token.length;
1042
1043 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1044
1045 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1046
1047 gss_release_buffer(&min_stat, &output_token);
1048
1049 return NT_STATUS_OK;
1050 }
1051
1052 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1053 TALLOC_CTX *mem_ctx,
1054 const uint8_t *data, size_t length,
1055 const uint8_t *whole_pdu, size_t pdu_length,
1056 const DATA_BLOB *sig)
1057 {
1058 struct gensec_gssapi_state *gensec_gssapi_state
1059 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1060 OM_uint32 maj_stat, min_stat;
1061 gss_buffer_desc input_token, output_token;
1062 int conf_state;
1063 gss_qop_t qop_state;
1064 DATA_BLOB in;
1065
1066 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1067
1068 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1069
1070 memcpy(in.data, sig->data, sig->length);
1071 memcpy(in.data + sig->length, data, length);
1072
1073 input_token.length = in.length;
1074 input_token.value = in.data;
1075
1076 maj_stat = gss_unwrap(&min_stat,
1077 gensec_gssapi_state->gssapi_context,
1078 &input_token,
1079 &output_token,
1080 &conf_state,
1081 &qop_state);
1082 if (GSS_ERROR(maj_stat)) {
1083 DEBUG(1, ("GSS UnWrap failed: %s\n",
1084 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1085 return NT_STATUS_ACCESS_DENIED;
1086 }
1087
1088 if (output_token.length != length) {
1089 return NT_STATUS_INTERNAL_ERROR;
1090 }
1091
1092 gss_release_buffer(&min_stat, &output_token);
1093
1094 return NT_STATUS_OK;
1095 }
1096
1097 /* Try to figure out what features we actually got on the connection */
1098 static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1099 uint32_t feature)
1100 {
1101 struct gensec_gssapi_state *gensec_gssapi_state
1102 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1103 if (feature & GENSEC_FEATURE_SIGN) {
1104 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1105 if (gensec_gssapi_state->sasl
1106 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1107 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1108 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1109 }
1110 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1111 }
1112 if (feature & GENSEC_FEATURE_SEAL) {
1113 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1114 if (gensec_gssapi_state->sasl
1115 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1116 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1117 && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1118 }
1119 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1120 }
1121 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1122 /* Only for GSSAPI/Krb5 */
1123 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1124 return True;
1125 }
1126 }
1127 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1128 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1129 }
1130 /* We can always do async (rather than strict request/reply) packets. */
1131 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1132 return True;
1133 }
1134 return False;
1135 }
1136
1137 /*
1138 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1139 * (for encrypting some passwords).
1140 *
1141 * This breaks all the abstractions, but what do you expect...
1142 */
1143 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1144 DATA_BLOB *session_key)
1145 {
1146 struct gensec_gssapi_state *gensec_gssapi_state
1147 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1148 OM_uint32 maj_stat, min_stat;
1149 krb5_keyblock *subkey;
1150
1151 if (gensec_gssapi_state->session_key.data) {
1152 *session_key = gensec_gssapi_state->session_key;
1153 return NT_STATUS_OK;
1154 }
1155
1156 maj_stat = gsskrb5_get_initiator_subkey(&min_stat,
1157 gensec_gssapi_state->gssapi_context,
1158 &subkey);
1159 if (maj_stat != 0) {
1160 DEBUG(1, ("NO session key for this mech\n"));
1161 return NT_STATUS_NO_USER_SESSION_KEY;
1162 }
1163
1164 DEBUG(10, ("Got KRB5 session key of length %d\n",
1165 (int)KRB5_KEY_LENGTH(subkey)));
1166 gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
1167 KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1168 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1169 *session_key = gensec_gssapi_state->session_key;
1170 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1171
1172 return NT_STATUS_OK;
1173 }
1174
1175 /* Get some basic (and authorization) information about the user on
1176 * this session. This uses either the PAC (if present) or a local
1177 * database lookup */
1178 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1179 struct auth_session_info **_session_info)
1180 {
1181 NTSTATUS nt_status;
1182 TALLOC_CTX *mem_ctx;
1183 struct gensec_gssapi_state *gensec_gssapi_state
1184 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1185 struct auth_serversupplied_info *server_info = NULL;
1186 struct auth_session_info *session_info = NULL;
1187 struct PAC_LOGON_INFO *logon_info;
1188 OM_uint32 maj_stat, min_stat;
1189 gss_buffer_desc name_token;
1190 gss_buffer_desc pac;
1191 krb5_keyblock *keyblock;
1192 time_t authtime;
1193 krb5_principal principal;
1194 char *principal_string;
1195 DATA_BLOB pac_blob;
1196
1197 if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1198 || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1199 gensec_gssapi_state->gss_oid->length) != 0)) {
1200 DEBUG(1, ("NO session info available for this mech\n"));
1201 return NT_STATUS_INVALID_PARAMETER;
1202 }
1203
1204 mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1205 NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1206
1207 maj_stat = gss_display_name (&min_stat,
1208 gensec_gssapi_state->client_name,
1209 &name_token,
1210 NULL);
1211 if (GSS_ERROR(maj_stat)) {
1212 DEBUG(1, ("GSS display_name failed: %s\n",
1213 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1214 talloc_free(mem_ctx);
1215 return NT_STATUS_FOOBAR;
1216 }
1217
1218 principal_string = talloc_strndup(mem_ctx, name_token.value, name_token.length);
1219
1220 gss_release_buffer(&min_stat, &name_token);
1221
1222 if (!principal_string) {
1223 talloc_free(mem_ctx);
1224 return NT_STATUS_NO_MEMORY;
1225 }
1226
1227 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1228 gensec_gssapi_state->gssapi_context,
1229 KRB5_AUTHDATA_WIN2K_PAC,
1230 &pac);
1231
1232
1233 if (maj_stat == 0) {
1234 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1235 gss_release_buffer(&min_stat, &pac);
1236
1237 } else {
1238 pac_blob = data_blob(NULL, 0);
1239 }
1240
1241 /* IF we have the PAC - otherwise we need to get this
1242 * data from elsewere - local ldb, or (TODO) lookup of some
1243 * kind...
1244 */
1245 if (pac_blob.length) {
1246 krb5_error_code ret;
1247 union netr_Validation validation;
1248
1249 maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
1250 gensec_gssapi_state->gssapi_context,
1251 &authtime);
1252
1253 if (GSS_ERROR(maj_stat)) {
1254 DEBUG(1, ("gsskrb5_extract_authtime_from_sec_context: %s\n",
1255 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1256 talloc_free(mem_ctx);
1257 return NT_STATUS_FOOBAR;
1258 }
1259
1260 maj_stat = gsskrb5_extract_service_keyblock(&min_stat,
1261 gensec_gssapi_state->gssapi_context,
1262 &keyblock);
1263
1264 if (GSS_ERROR(maj_stat)) {
1265 DEBUG(1, ("gsskrb5_copy_service_keyblock failed: %s\n",
1266 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1267 talloc_free(mem_ctx);
1268 return NT_STATUS_FOOBAR;
1269 }
1270
1271 ret = krb5_parse_name_flags(gensec_gssapi_state->smb_krb5_context->krb5_context,
1272 principal_string,
1273 KRB5_PRINCIPAL_PARSE_MUST_REALM,
1274 &principal);
1275 if (ret) {
1276 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1277 keyblock);
1278 talloc_free(mem_ctx);
1279 return NT_STATUS_INVALID_PARAMETER;
1280 }
1281
1282 /* decode and verify the pac */
1283 nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
1284 gensec_gssapi_state->smb_krb5_context->krb5_context,
1285 NULL, keyblock, principal, authtime, NULL);
1286 krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
1287 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1288 keyblock);
1289
1290 if (!NT_STATUS_IS_OK(nt_status)) {
1291 talloc_free(mem_ctx);
1292 return nt_status;
1293 }
1294 validation.sam3 = &logon_info->info3;
1295 nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
1296 NULL,
1297 3, &validation,
1298 &server_info);
1299 if (!NT_STATUS_IS_OK(nt_status)) {
1300 talloc_free(mem_ctx);
1301 return nt_status;
1302 }
1303 } else if (!lp_parm_bool(-1, "gensec", "require_pac", False)) {
1304 DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1305 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1306 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
1307 &server_info);
1308
1309 if (!NT_STATUS_IS_OK(nt_status)) {
1310 talloc_free(mem_ctx);
1311 return nt_status;
1312 }
1313 } else {
1314 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1315 principal_string,
1316 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1317 return NT_STATUS_ACCESS_DENIED;
1318 }
1319
1320 /* references the server_info into the session_info */
1321 nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
1322 if (!NT_STATUS_IS_OK(nt_status)) {
1323 talloc_free(mem_ctx);
1324 return nt_status;
1325 }
1326
1327 nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1328 if (!NT_STATUS_IS_OK(nt_status)) {
1329 talloc_free(mem_ctx);
1330 return nt_status;
1331 }
1332
1333 if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1334 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1335 } else {
1336 krb5_error_code ret;
1337 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1338 session_info->credentials = cli_credentials_init(session_info);
1339 if (!session_info->credentials) {
1340 talloc_free(mem_ctx);
1341 return NT_STATUS_NO_MEMORY;
1342 }
1343
1344 cli_credentials_set_conf(session_info->credentials);
1345
1346 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1347 gensec_gssapi_state->delegated_cred_handle,
1348 CRED_SPECIFIED);
1349 if (ret) {
1350 talloc_free(mem_ctx);
1351 return NT_STATUS_NO_MEMORY;
1352 }
1353 /* It has been taken from this place... */
1354 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1355 }
1356 talloc_steal(gensec_gssapi_state, session_info);
1357 talloc_free(mem_ctx);
1358 *_session_info = session_info;
1359
1360 return NT_STATUS_OK;
1361 }
1362
1363 static const char *gensec_gssapi_krb5_oids[] = {
1364 GENSEC_OID_KERBEROS5,
1365 GENSEC_OID_KERBEROS5_OLD,
1366 NULL
1367 };
1368
1369 static const char *gensec_gssapi_spnego_oids[] = {
1370 GENSEC_OID_SPNEGO,
1371 NULL
1372 };
1373
1374 /* As a server, this could in theory accept any GSSAPI mech */
1375 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1376 .name = "gssapi_spnego",
1377 .sasl_name = "GSS-SPNEGO",
1378 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1379 .oid = gensec_gssapi_spnego_oids,
1380 .client_start = gensec_gssapi_client_start,
1381 .server_start = gensec_gssapi_server_start,
1382 .magic = gensec_gssapi_magic,
1383 .update = gensec_gssapi_update,
1384 .session_key = gensec_gssapi_session_key,
1385 .session_info = gensec_gssapi_session_info,
1386 .sign_packet = gensec_gssapi_sign_packet,
1387 .check_packet = gensec_gssapi_check_packet,
1388 .seal_packet = gensec_gssapi_seal_packet,
1389 .unseal_packet = gensec_gssapi_unseal_packet,
1390 .wrap = gensec_gssapi_wrap,
1391 .unwrap = gensec_gssapi_unwrap,
1392 .have_feature = gensec_gssapi_have_feature,
1393 .enabled = False,
1394 .kerberos = True,
1395 .priority = GENSEC_GSSAPI
1396 };
1397
1398 /* As a server, this could in theory accept any GSSAPI mech */
1399 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1400 .name = "gssapi_krb5",
1401 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1402 .oid = gensec_gssapi_krb5_oids,
1403 .client_start = gensec_gssapi_client_start,
1404 .server_start = gensec_gssapi_server_start,
1405 .magic = gensec_gssapi_magic,
1406 .update = gensec_gssapi_update,
1407 .session_key = gensec_gssapi_session_key,
1408 .session_info = gensec_gssapi_session_info,
1409 .sign_packet = gensec_gssapi_sign_packet,
1410 .check_packet = gensec_gssapi_check_packet,
1411 .seal_packet = gensec_gssapi_seal_packet,
1412 .unseal_packet = gensec_gssapi_unseal_packet,
1413 .wrap = gensec_gssapi_wrap,
1414 .unwrap = gensec_gssapi_unwrap,
1415 .have_feature = gensec_gssapi_have_feature,
1416 .enabled = True,
1417 .kerberos = True,
1418 .priority = GENSEC_GSSAPI
1419 };
1420
1421 /* As a server, this could in theory accept any GSSAPI mech */
1422 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1423 .name = "gssapi_krb5_sasl",
1424 .sasl_name = "GSSAPI",
1425 .client_start = gensec_gssapi_sasl_client_start,
1426 .server_start = gensec_gssapi_sasl_server_start,
1427 .update = gensec_gssapi_update,
1428 .session_key = gensec_gssapi_session_key,
1429 .session_info = gensec_gssapi_session_info,
1430 .max_input_size = gensec_gssapi_max_input_size,
1431 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1432 .wrap = gensec_gssapi_wrap,
1433 .unwrap = gensec_gssapi_unwrap,
1434 .have_feature = gensec_gssapi_have_feature,
1435 .enabled = True,
1436 .kerberos = True,
1437 .priority = GENSEC_GSSAPI
1438 };
1439
1440 NTSTATUS gensec_gssapi_init(void)
1441 {
1442 NTSTATUS ret;
1443
1444 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1445 if (!NT_STATUS_IS_OK(ret)) {
1446 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1447 gensec_gssapi_spnego_security_ops.name));
1448 return ret;
1449 }
1450
1451 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1452 if (!NT_STATUS_IS_OK(ret)) {
1453 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1454 gensec_gssapi_krb5_security_ops.name));
1455 return ret;
1456 }
1457
1458 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1459 if (!NT_STATUS_IS_OK(ret)) {
1460 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1461 gensec_gssapi_sasl_krb5_security_ops.name));
1462 return ret;
1463 }
1464
1465 return ret;
1466 }
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