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r22294: Lock the delegated credentials to being kerberos only, we just don't
[Samba.git] / source / auth / gensec / gensec_gssapi.c
blob82a79e1945fffa7be6e5cebb86de1260d60378fe
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_destructor(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_destructor);
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_type = GSS_C_NULL_OID;
324 } else {
325 principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
326 gensec_get_target_service(gensec_security),
327 hostname);
328
329 name_type = GSS_C_NT_HOSTBASED_SERVICE;
330 }
331 name_token.value = discard_const_p(uint8_t, principal);
332 name_token.length = strlen(principal);
333
334
335 maj_stat = gss_import_name (&min_stat,
336 &name_token,
337 name_type,
338 &gensec_gssapi_state->server_name);
339 if (maj_stat) {
340 DEBUG(2, ("GSS Import name of %s failed: %s\n",
341 (char *)name_token.value,
342 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
343 return NT_STATUS_INVALID_PARAMETER;
344 }
345
346 ret = cli_credentials_get_client_gss_creds(creds, &gcc);
347 switch (ret) {
348 case 0:
349 break;
350 case KRB5_KDC_UNREACH:
351 DEBUG(3, ("Cannot reach a KDC we require to contact %s\n", principal));
352 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
353 default:
354 DEBUG(1, ("Aquiring initiator credentails failed\n"));
355 return NT_STATUS_UNSUCCESSFUL;
356 }
357
358 gensec_gssapi_state->client_cred = gcc;
359
360 return NT_STATUS_OK;
361 }
362
363 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
364 {
365 NTSTATUS nt_status;
366 struct gensec_gssapi_state *gensec_gssapi_state;
367 nt_status = gensec_gssapi_client_start(gensec_security);
368
369 if (NT_STATUS_IS_OK(nt_status)) {
370 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
371 gensec_gssapi_state->sasl = True;
372 }
373 return nt_status;
374 }
375
376
377 /**
378 * Check if the packet is one for this mechansim
379 *
380 * @param gensec_security GENSEC state
381 * @param in The request, as a DATA_BLOB
382 * @return Error, INVALID_PARAMETER if it's not a packet for us
383 * or NT_STATUS_OK if the packet is ok.
384 */
385
386 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
387 const DATA_BLOB *in)
388 {
389 if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
390 return NT_STATUS_OK;
391 } else {
392 return NT_STATUS_INVALID_PARAMETER;
393 }
394 }
395
396
397 /**
398 * Next state function for the GSSAPI GENSEC mechanism
399 *
400 * @param gensec_gssapi_state GSSAPI State
401 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
402 * @param in The request, as a DATA_BLOB
403 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
404 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
405 * or NT_STATUS_OK if the user is authenticated.
406 */
407
408 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
409 TALLOC_CTX *out_mem_ctx,
410 const DATA_BLOB in, DATA_BLOB *out)
411 {
412 struct gensec_gssapi_state *gensec_gssapi_state
413 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
414 NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
415 OM_uint32 maj_stat, min_stat;
416 OM_uint32 min_stat2;
417 gss_buffer_desc input_token, output_token;
418 gss_OID gss_oid_p = NULL;
419 input_token.length = in.length;
420 input_token.value = in.data;
421
422 switch (gensec_gssapi_state->sasl_state) {
423 case STAGE_GSS_NEG:
424 {
425 switch (gensec_security->gensec_role) {
426 case GENSEC_CLIENT:
427 {
428 maj_stat = gss_init_sec_context(&min_stat,
429 gensec_gssapi_state->client_cred->creds,
430 &gensec_gssapi_state->gssapi_context,
431 gensec_gssapi_state->server_name,
432 discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
433 gensec_gssapi_state->want_flags,
434 0,
435 gensec_gssapi_state->input_chan_bindings,
436 &input_token,
437 &gss_oid_p,
438 &output_token,
439 &gensec_gssapi_state->got_flags, /* ret flags */
440 NULL);
441 if (gss_oid_p) {
442 gensec_gssapi_state->gss_oid = gss_oid_p;
443 }
444 break;
445 }
446 case GENSEC_SERVER:
447 {
448 maj_stat = gss_accept_sec_context(&min_stat,
449 &gensec_gssapi_state->gssapi_context,
450 gensec_gssapi_state->server_cred->creds,
451 &input_token,
452 gensec_gssapi_state->input_chan_bindings,
453 &gensec_gssapi_state->client_name,
454 &gss_oid_p,
455 &output_token,
456 &gensec_gssapi_state->got_flags,
457 NULL,
458 &gensec_gssapi_state->delegated_cred_handle);
459 if (gss_oid_p) {
460 gensec_gssapi_state->gss_oid = gss_oid_p;
461 }
462 break;
463 }
464 default:
465 return NT_STATUS_INVALID_PARAMETER;
466
467 }
468
469 gensec_gssapi_state->gss_exchange_count++;
470
471 if (maj_stat == GSS_S_COMPLETE) {
472 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
473 gss_release_buffer(&min_stat2, &output_token);
474
475 if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
476 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
477 } else {
478 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
479 }
480
481 /* We may have been invoked as SASL, so there
482 * is more work to do */
483 if (gensec_gssapi_state->sasl) {
484 /* Due to a very subtle interaction
485 * with SASL and the LDAP libs, we
486 * must ensure the data pointer is
487 * != NULL, but the length is 0.
488 *
489 * This ensures we send a 'zero
490 * length' (rather than NULL) response
491 */
492
493 if (!out->data) {
494 out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
495 }
496
497 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
498 return NT_STATUS_MORE_PROCESSING_REQUIRED;
499 } else {
500 gensec_gssapi_state->sasl_state = STAGE_DONE;
501
502 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
503 DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
504 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
505 DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
506 } else {
507 DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
508 }
509
510 return NT_STATUS_OK;
511 }
512 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
513 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
514 gss_release_buffer(&min_stat2, &output_token);
515
516 return NT_STATUS_MORE_PROCESSING_REQUIRED;
517 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
518 switch (min_stat) {
519 case KRB5_KDC_UNREACH:
520 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
521 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
522 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
523 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
524 DEBUG(3, ("Server is not registered with our KDC: %s\n",
525 gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
526 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
527 case KRB5KRB_AP_ERR_MSG_TYPE:
528 /* garbage input, possibly from the auto-mech detection */
529 return NT_STATUS_INVALID_PARAMETER;
530 default:
531 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
532 gensec_gssapi_state->gss_exchange_count,
533 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
534 return nt_status;
535 }
536 } else {
537 DEBUG(1, ("GSS Update(%d) failed: %s\n",
538 gensec_gssapi_state->gss_exchange_count,
539 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
540 return nt_status;
541 }
542 break;
543 }
544
545 /* These last two stages are only done if we were invoked as SASL */
546 case STAGE_SASL_SSF_NEG:
547 {
548 switch (gensec_security->gensec_role) {
549 case GENSEC_CLIENT:
550 {
551 uint8_t maxlength_proposed[4];
552 uint8_t maxlength_accepted[4];
553 uint8_t security_supported;
554 int conf_state;
555 gss_qop_t qop_state;
556 input_token.length = in.length;
557 input_token.value = in.data;
558
559 /* As a client, we have just send a
560 * zero-length blob to the server (after the
561 * normal GSSAPI exchange), and it has replied
562 * with it's SASL negotiation */
563
564 maj_stat = gss_unwrap(&min_stat,
565 gensec_gssapi_state->gssapi_context,
566 &input_token,
567 &output_token,
568 &conf_state,
569 &qop_state);
570 if (GSS_ERROR(maj_stat)) {
571 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
572 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
573 return NT_STATUS_ACCESS_DENIED;
574 }
575
576 if (output_token.length < 4) {
577 return NT_STATUS_INVALID_PARAMETER;
578 }
579
580 memcpy(maxlength_proposed, output_token.value, 4);
581 gss_release_buffer(&min_stat, &output_token);
582
583 /* first byte is the proposed security */
584 security_supported = maxlength_proposed[0];
585 maxlength_proposed[0] = '\0';
586
587 /* Rest is the proposed max wrap length */
588 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
589 gensec_gssapi_state->max_wrap_buf_size);
590 gensec_gssapi_state->sasl_protection = 0;
591 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
592 if (security_supported & NEG_SEAL) {
593 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
594 }
595 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
596 if (security_supported & NEG_SIGN) {
597 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
598 }
599 } else if (security_supported & NEG_NONE) {
600 gensec_gssapi_state->sasl_protection |= NEG_NONE;
601 } else {
602 DEBUG(1, ("Remote server does not support unprotected connections"));
603 return NT_STATUS_ACCESS_DENIED;
604 }
605
606 /* Send back the negotiated max length */
607
608 RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
609
610 maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
611
612 input_token.value = maxlength_accepted;
613 input_token.length = sizeof(maxlength_accepted);
614
615 maj_stat = gss_wrap(&min_stat,
616 gensec_gssapi_state->gssapi_context,
617 False,
618 GSS_C_QOP_DEFAULT,
619 &input_token,
620 &conf_state,
621 &output_token);
622 if (GSS_ERROR(maj_stat)) {
623 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
624 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
625 return NT_STATUS_ACCESS_DENIED;
626 }
627
628 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
629 gss_release_buffer(&min_stat, &output_token);
630
631 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
632 gensec_gssapi_state->sasl_state = STAGE_DONE;
633
634 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
635 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
636 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
637 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
638 } else {
639 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
640 }
641
642 return NT_STATUS_OK;
643 }
644 case GENSEC_SERVER:
645 {
646 uint8_t maxlength_proposed[4];
647 uint8_t security_supported = 0x0;
648 int conf_state;
649
650 /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
651 if (in.length != 0) {
652 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
653 }
654
655 /* Give the client some idea what we will support */
656
657 RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
658 /* first byte is the proposed security */
659 maxlength_proposed[0] = '\0';
660
661 gensec_gssapi_state->sasl_protection = 0;
662 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
663 security_supported |= NEG_SEAL;
664 }
665 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
666 security_supported |= NEG_SIGN;
667 }
668 if (security_supported == 0) {
669 /* If we don't support anything, this must be 0 */
670 RSIVAL(maxlength_proposed, 0, 0x0);
671 }
672
673 /* TODO: We may not wish to support this */
674 security_supported |= NEG_NONE;
675 maxlength_proposed[0] = security_supported;
676
677 input_token.value = maxlength_proposed;
678 input_token.length = sizeof(maxlength_proposed);
679
680 maj_stat = gss_wrap(&min_stat,
681 gensec_gssapi_state->gssapi_context,
682 False,
683 GSS_C_QOP_DEFAULT,
684 &input_token,
685 &conf_state,
686 &output_token);
687 if (GSS_ERROR(maj_stat)) {
688 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
689 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
690 return NT_STATUS_ACCESS_DENIED;
691 }
692
693 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
694 gss_release_buffer(&min_stat, &output_token);
695
696 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
697 return NT_STATUS_MORE_PROCESSING_REQUIRED;
698 }
699 default:
700 return NT_STATUS_INVALID_PARAMETER;
701
702 }
703 }
704 /* This is s server-only stage */
705 case STAGE_SASL_SSF_ACCEPT:
706 {
707 uint8_t maxlength_accepted[4];
708 uint8_t security_accepted;
709 int conf_state;
710 gss_qop_t qop_state;
711 input_token.length = in.length;
712 input_token.value = in.data;
713
714 maj_stat = gss_unwrap(&min_stat,
715 gensec_gssapi_state->gssapi_context,
716 &input_token,
717 &output_token,
718 &conf_state,
719 &qop_state);
720 if (GSS_ERROR(maj_stat)) {
721 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
722 gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
723 return NT_STATUS_ACCESS_DENIED;
724 }
725
726 if (output_token.length < 4) {
727 return NT_STATUS_INVALID_PARAMETER;
728 }
729
730 memcpy(maxlength_accepted, output_token.value, 4);
731 gss_release_buffer(&min_stat, &output_token);
732
733 /* first byte is the proposed security */
734 security_accepted = maxlength_accepted[0];
735 maxlength_accepted[0] = '\0';
736
737 /* Rest is the proposed max wrap length */
738 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
739 gensec_gssapi_state->max_wrap_buf_size);
740
741 gensec_gssapi_state->sasl_protection = 0;
742 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
743 if (security_accepted & NEG_SEAL) {
744 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
745 }
746 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
747 if (security_accepted & NEG_SIGN) {
748 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
749 }
750 } else if (security_accepted & NEG_NONE) {
751 gensec_gssapi_state->sasl_protection |= NEG_NONE;
752 } else {
753 DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
754 return NT_STATUS_ACCESS_DENIED;
755 }
756
757 /* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
758 gensec_gssapi_state->sasl_state = STAGE_DONE;
759 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
760 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
761 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
762 DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
763 } else {
764 DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
765 }
766
767 *out = data_blob(NULL, 0);
768 return NT_STATUS_OK;
769 }
770 default:
771 return NT_STATUS_INVALID_PARAMETER;
772 }
773 }
774
775 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
776 TALLOC_CTX *mem_ctx,
777 const DATA_BLOB *in,
778 DATA_BLOB *out)
779 {
780 struct gensec_gssapi_state *gensec_gssapi_state
781 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
782 OM_uint32 maj_stat, min_stat;
783 gss_buffer_desc input_token, output_token;
784 int conf_state;
785 input_token.length = in->length;
786 input_token.value = in->data;
787
788 maj_stat = gss_wrap(&min_stat,
789 gensec_gssapi_state->gssapi_context,
790 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
791 GSS_C_QOP_DEFAULT,
792 &input_token,
793 &conf_state,
794 &output_token);
795 if (GSS_ERROR(maj_stat)) {
796 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
797 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
798 return NT_STATUS_ACCESS_DENIED;
799 }
800
801 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
802 gss_release_buffer(&min_stat, &output_token);
803
804 if (gensec_gssapi_state->sasl) {
805 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
806 if (max_wrapped_size < out->length) {
807 DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
808 (unsigned)in->length,
809 (unsigned)out->length,
810 (unsigned int)max_wrapped_size));
811 return NT_STATUS_INVALID_PARAMETER;
812 }
813 }
814
815 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
816 && !conf_state) {
817 return NT_STATUS_ACCESS_DENIED;
818 }
819 return NT_STATUS_OK;
820 }
821
822 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
823 TALLOC_CTX *mem_ctx,
824 const DATA_BLOB *in,
825 DATA_BLOB *out)
826 {
827 struct gensec_gssapi_state *gensec_gssapi_state
828 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
829 OM_uint32 maj_stat, min_stat;
830 gss_buffer_desc input_token, output_token;
831 int conf_state;
832 gss_qop_t qop_state;
833 input_token.length = in->length;
834 input_token.value = in->data;
835
836 if (gensec_gssapi_state->sasl) {
837 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
838 if (max_wrapped_size < in->length) {
839 DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
840 return NT_STATUS_INVALID_PARAMETER;
841 }
842 }
843
844 maj_stat = gss_unwrap(&min_stat,
845 gensec_gssapi_state->gssapi_context,
846 &input_token,
847 &output_token,
848 &conf_state,
849 &qop_state);
850 if (GSS_ERROR(maj_stat)) {
851 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
852 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
853 return NT_STATUS_ACCESS_DENIED;
854 }
855
856 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
857 gss_release_buffer(&min_stat, &output_token);
858
859 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
860 && !conf_state) {
861 return NT_STATUS_ACCESS_DENIED;
862 }
863 return NT_STATUS_OK;
864 }
865
866 /* Find out the maximum input size negotiated on this connection */
867
868 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
869 {
870 struct gensec_gssapi_state *gensec_gssapi_state
871 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
872 OM_uint32 maj_stat, min_stat;
873 OM_uint32 max_input_size;
874
875 maj_stat = gss_wrap_size_limit(&min_stat,
876 gensec_gssapi_state->gssapi_context,
877 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
878 GSS_C_QOP_DEFAULT,
879 gensec_gssapi_state->max_wrap_buf_size,
880 &max_input_size);
881 if (GSS_ERROR(maj_stat)) {
882 TALLOC_CTX *mem_ctx = talloc_new(NULL);
883 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
884 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
885 talloc_free(mem_ctx);
886 return 0;
887 }
888
889 return max_input_size;
890 }
891
892 /* Find out the maximum output size negotiated on this connection */
893 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
894 {
895 struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
896 return gensec_gssapi_state->max_wrap_buf_size;
897 }
898
899 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
900 TALLOC_CTX *mem_ctx,
901 uint8_t *data, size_t length,
902 const uint8_t *whole_pdu, size_t pdu_length,
903 DATA_BLOB *sig)
904 {
905 struct gensec_gssapi_state *gensec_gssapi_state
906 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
907 OM_uint32 maj_stat, min_stat;
908 gss_buffer_desc input_token, output_token;
909 int conf_state;
910 ssize_t sig_length;
911
912 input_token.length = length;
913 input_token.value = data;
914
915 maj_stat = gss_wrap(&min_stat,
916 gensec_gssapi_state->gssapi_context,
917 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
918 GSS_C_QOP_DEFAULT,
919 &input_token,
920 &conf_state,
921 &output_token);
922 if (GSS_ERROR(maj_stat)) {
923 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
924 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
925 return NT_STATUS_ACCESS_DENIED;
926 }
927
928 if (output_token.length < input_token.length) {
929 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
930 (long)output_token.length, (long)length));
931 return NT_STATUS_INTERNAL_ERROR;
932 }
933 sig_length = output_token.length - input_token.length;
934
935 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
936 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
937
938 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
939 dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
940 dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
941
942 gss_release_buffer(&min_stat, &output_token);
943
944 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
945 && !conf_state) {
946 return NT_STATUS_ACCESS_DENIED;
947 }
948 return NT_STATUS_OK;
949 }
950
951 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
952 TALLOC_CTX *mem_ctx,
953 uint8_t *data, size_t length,
954 const uint8_t *whole_pdu, size_t pdu_length,
955 const DATA_BLOB *sig)
956 {
957 struct gensec_gssapi_state *gensec_gssapi_state
958 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
959 OM_uint32 maj_stat, min_stat;
960 gss_buffer_desc input_token, output_token;
961 int conf_state;
962 gss_qop_t qop_state;
963 DATA_BLOB in;
964
965 dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
966
967 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
968
969 memcpy(in.data, sig->data, sig->length);
970 memcpy(in.data + sig->length, data, length);
971
972 input_token.length = in.length;
973 input_token.value = in.data;
974
975 maj_stat = gss_unwrap(&min_stat,
976 gensec_gssapi_state->gssapi_context,
977 &input_token,
978 &output_token,
979 &conf_state,
980 &qop_state);
981 if (GSS_ERROR(maj_stat)) {
982 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
983 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
984 return NT_STATUS_ACCESS_DENIED;
985 }
986
987 if (output_token.length != length) {
988 return NT_STATUS_INTERNAL_ERROR;
989 }
990
991 memcpy(data, output_token.value, length);
992
993 gss_release_buffer(&min_stat, &output_token);
994
995 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
996 && !conf_state) {
997 return NT_STATUS_ACCESS_DENIED;
998 }
999 return NT_STATUS_OK;
1000 }
1001
1002 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1003 TALLOC_CTX *mem_ctx,
1004 const uint8_t *data, size_t length,
1005 const uint8_t *whole_pdu, size_t pdu_length,
1006 DATA_BLOB *sig)
1007 {
1008 struct gensec_gssapi_state *gensec_gssapi_state
1009 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1010 OM_uint32 maj_stat, min_stat;
1011 gss_buffer_desc input_token, output_token;
1012 int conf_state;
1013 ssize_t sig_length = 0;
1014
1015 input_token.length = length;
1016 input_token.value = discard_const_p(uint8_t *, data);
1017
1018 maj_stat = gss_wrap(&min_stat,
1019 gensec_gssapi_state->gssapi_context,
1020 0,
1021 GSS_C_QOP_DEFAULT,
1022 &input_token,
1023 &conf_state,
1024 &output_token);
1025 if (GSS_ERROR(maj_stat)) {
1026 DEBUG(1, ("GSS Wrap failed: %s\n",
1027 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1028 return NT_STATUS_ACCESS_DENIED;
1029 }
1030
1031 if (output_token.length < input_token.length) {
1032 DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1033 (long)output_token.length, (long)length));
1034 return NT_STATUS_INTERNAL_ERROR;
1035 }
1036
1037 /* Caller must pad to right boundary */
1038 sig_length = output_token.length - input_token.length;
1039
1040 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1041
1042 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1043
1044 gss_release_buffer(&min_stat, &output_token);
1045
1046 return NT_STATUS_OK;
1047 }
1048
1049 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1050 TALLOC_CTX *mem_ctx,
1051 const uint8_t *data, size_t length,
1052 const uint8_t *whole_pdu, size_t pdu_length,
1053 const DATA_BLOB *sig)
1054 {
1055 struct gensec_gssapi_state *gensec_gssapi_state
1056 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1057 OM_uint32 maj_stat, min_stat;
1058 gss_buffer_desc input_token, output_token;
1059 int conf_state;
1060 gss_qop_t qop_state;
1061 DATA_BLOB in;
1062
1063 dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1064
1065 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1066
1067 memcpy(in.data, sig->data, sig->length);
1068 memcpy(in.data + sig->length, data, length);
1069
1070 input_token.length = in.length;
1071 input_token.value = in.data;
1072
1073 maj_stat = gss_unwrap(&min_stat,
1074 gensec_gssapi_state->gssapi_context,
1075 &input_token,
1076 &output_token,
1077 &conf_state,
1078 &qop_state);
1079 if (GSS_ERROR(maj_stat)) {
1080 DEBUG(1, ("GSS UnWrap failed: %s\n",
1081 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1082 return NT_STATUS_ACCESS_DENIED;
1083 }
1084
1085 if (output_token.length != length) {
1086 return NT_STATUS_INTERNAL_ERROR;
1087 }
1088
1089 gss_release_buffer(&min_stat, &output_token);
1090
1091 return NT_STATUS_OK;
1092 }
1093
1094 /* Try to figure out what features we actually got on the connection */
1095 static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1096 uint32_t feature)
1097 {
1098 struct gensec_gssapi_state *gensec_gssapi_state
1099 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1100 if (feature & GENSEC_FEATURE_SIGN) {
1101 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1102 if (gensec_gssapi_state->sasl
1103 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1104 return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1105 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1106 }
1107 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1108 }
1109 if (feature & GENSEC_FEATURE_SEAL) {
1110 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1111 if (gensec_gssapi_state->sasl
1112 && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1113 return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1114 && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1115 }
1116 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1117 }
1118 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1119 /* Only for GSSAPI/Krb5 */
1120 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1121 return True;
1122 }
1123 }
1124 if (feature & GENSEC_FEATURE_DCE_STYLE) {
1125 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1126 }
1127 /* We can always do async (rather than strict request/reply) packets. */
1128 if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1129 return True;
1130 }
1131 return False;
1132 }
1133
1134 /*
1135 * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1136 * (for encrypting some passwords).
1137 *
1138 * This breaks all the abstractions, but what do you expect...
1139 */
1140 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1141 DATA_BLOB *session_key)
1142 {
1143 struct gensec_gssapi_state *gensec_gssapi_state
1144 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1145 OM_uint32 maj_stat, min_stat;
1146 krb5_keyblock *subkey;
1147
1148 if (gensec_gssapi_state->session_key.data) {
1149 *session_key = gensec_gssapi_state->session_key;
1150 return NT_STATUS_OK;
1151 }
1152
1153 maj_stat = gsskrb5_get_initiator_subkey(&min_stat,
1154 gensec_gssapi_state->gssapi_context,
1155 &subkey);
1156 if (maj_stat != 0) {
1157 DEBUG(1, ("NO session key for this mech\n"));
1158 return NT_STATUS_NO_USER_SESSION_KEY;
1159 }
1160
1161 DEBUG(10, ("Got KRB5 session key of length %d\n",
1162 (int)KRB5_KEY_LENGTH(subkey)));
1163 gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
1164 KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1165 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1166 *session_key = gensec_gssapi_state->session_key;
1167 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1168
1169 return NT_STATUS_OK;
1170 }
1171
1172 /* Get some basic (and authorization) information about the user on
1173 * this session. This uses either the PAC (if present) or a local
1174 * database lookup */
1175 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1176 struct auth_session_info **_session_info)
1177 {
1178 NTSTATUS nt_status;
1179 TALLOC_CTX *mem_ctx;
1180 struct gensec_gssapi_state *gensec_gssapi_state
1181 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1182 struct auth_serversupplied_info *server_info = NULL;
1183 struct auth_session_info *session_info = NULL;
1184 struct PAC_LOGON_INFO *logon_info;
1185 OM_uint32 maj_stat, min_stat;
1186 gss_buffer_desc name_token;
1187 gss_buffer_desc pac;
1188 krb5_keyblock *keyblock;
1189 time_t authtime;
1190 krb5_principal principal;
1191 char *principal_string;
1192 DATA_BLOB pac_blob;
1193
1194 if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1195 || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1196 gensec_gssapi_state->gss_oid->length) != 0)) {
1197 DEBUG(1, ("NO session info available for this mech\n"));
1198 return NT_STATUS_INVALID_PARAMETER;
1199 }
1200
1201 mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1202 NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1203
1204 maj_stat = gss_display_name (&min_stat,
1205 gensec_gssapi_state->client_name,
1206 &name_token,
1207 NULL);
1208 if (GSS_ERROR(maj_stat)) {
1209 DEBUG(1, ("GSS display_name failed: %s\n",
1210 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1211 talloc_free(mem_ctx);
1212 return NT_STATUS_FOOBAR;
1213 }
1214
1215 principal_string = talloc_strndup(mem_ctx, name_token.value, name_token.length);
1216
1217 gss_release_buffer(&min_stat, &name_token);
1218
1219 if (!principal_string) {
1220 talloc_free(mem_ctx);
1221 return NT_STATUS_NO_MEMORY;
1222 }
1223
1224 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1225 gensec_gssapi_state->gssapi_context,
1226 KRB5_AUTHDATA_WIN2K_PAC,
1227 &pac);
1228
1229
1230 if (maj_stat == 0) {
1231 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1232 gss_release_buffer(&min_stat, &pac);
1233
1234 } else {
1235 pac_blob = data_blob(NULL, 0);
1236 }
1237
1238 /* IF we have the PAC - otherwise we need to get this
1239 * data from elsewere - local ldb, or (TODO) lookup of some
1240 * kind...
1241 */
1242 if (pac_blob.length) {
1243 krb5_error_code ret;
1244 union netr_Validation validation;
1245
1246 maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
1247 gensec_gssapi_state->gssapi_context,
1248 &authtime);
1249
1250 if (GSS_ERROR(maj_stat)) {
1251 DEBUG(1, ("gsskrb5_extract_authtime_from_sec_context: %s\n",
1252 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1253 talloc_free(mem_ctx);
1254 return NT_STATUS_FOOBAR;
1255 }
1256
1257 maj_stat = gsskrb5_extract_service_keyblock(&min_stat,
1258 gensec_gssapi_state->gssapi_context,
1259 &keyblock);
1260
1261 if (GSS_ERROR(maj_stat)) {
1262 DEBUG(1, ("gsskrb5_copy_service_keyblock failed: %s\n",
1263 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1264 talloc_free(mem_ctx);
1265 return NT_STATUS_FOOBAR;
1266 }
1267
1268 ret = krb5_parse_name_flags(gensec_gssapi_state->smb_krb5_context->krb5_context,
1269 principal_string,
1270 KRB5_PRINCIPAL_PARSE_MUST_REALM,
1271 &principal);
1272 if (ret) {
1273 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1274 keyblock);
1275 talloc_free(mem_ctx);
1276 return NT_STATUS_INVALID_PARAMETER;
1277 }
1278
1279 /* decode and verify the pac */
1280 nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
1281 gensec_gssapi_state->smb_krb5_context->krb5_context,
1282 NULL, keyblock, principal, authtime, NULL);
1283 krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
1284 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1285 keyblock);
1286
1287 if (!NT_STATUS_IS_OK(nt_status)) {
1288 talloc_free(mem_ctx);
1289 return nt_status;
1290 }
1291 validation.sam3 = &logon_info->info3;
1292 nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
1293 NULL,
1294 3, &validation,
1295 &server_info);
1296 if (!NT_STATUS_IS_OK(nt_status)) {
1297 talloc_free(mem_ctx);
1298 return nt_status;
1299 }
1300 } else if (!lp_parm_bool(-1, "gensec", "require_pac", False)) {
1301 DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1302 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1303 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
1304 &server_info);
1305
1306 if (!NT_STATUS_IS_OK(nt_status)) {
1307 talloc_free(mem_ctx);
1308 return nt_status;
1309 }
1310 } else {
1311 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1312 principal_string,
1313 gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1314 return NT_STATUS_ACCESS_DENIED;
1315 }
1316
1317 /* references the server_info into the session_info */
1318 nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
1319 if (!NT_STATUS_IS_OK(nt_status)) {
1320 talloc_free(mem_ctx);
1321 return nt_status;
1322 }
1323
1324 nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1325 if (!NT_STATUS_IS_OK(nt_status)) {
1326 talloc_free(mem_ctx);
1327 return nt_status;
1328 }
1329
1330 if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1331 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1332 } else {
1333 krb5_error_code ret;
1334 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1335 session_info->credentials = cli_credentials_init(session_info);
1336 if (!session_info->credentials) {
1337 talloc_free(mem_ctx);
1338 return NT_STATUS_NO_MEMORY;
1339 }
1340
1341 cli_credentials_set_conf(session_info->credentials);
1342 /* Just so we don't segfault trying to get at a username */
1343 cli_credentials_set_anonymous(session_info->credentials);
1344
1345 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1346 gensec_gssapi_state->delegated_cred_handle,
1347 CRED_SPECIFIED);
1348 if (ret) {
1349 talloc_free(mem_ctx);
1350 return NT_STATUS_NO_MEMORY;
1351 }
1352
1353 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1354 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1355
1356 /* It has been taken from this place... */
1357 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1358 }
1359 talloc_steal(gensec_gssapi_state, session_info);
1360 talloc_free(mem_ctx);
1361 *_session_info = session_info;
1362
1363 return NT_STATUS_OK;
1364 }
1365
1366 static const char *gensec_gssapi_krb5_oids[] = {
1367 GENSEC_OID_KERBEROS5_OLD,
1368 GENSEC_OID_KERBEROS5,
1369 NULL
1370 };
1371
1372 static const char *gensec_gssapi_spnego_oids[] = {
1373 GENSEC_OID_SPNEGO,
1374 NULL
1375 };
1376
1377 /* As a server, this could in theory accept any GSSAPI mech */
1378 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1379 .name = "gssapi_spnego",
1380 .sasl_name = "GSS-SPNEGO",
1381 .auth_type = DCERPC_AUTH_TYPE_SPNEGO,
1382 .oid = gensec_gssapi_spnego_oids,
1383 .client_start = gensec_gssapi_client_start,
1384 .server_start = gensec_gssapi_server_start,
1385 .magic = gensec_gssapi_magic,
1386 .update = gensec_gssapi_update,
1387 .session_key = gensec_gssapi_session_key,
1388 .session_info = gensec_gssapi_session_info,
1389 .sign_packet = gensec_gssapi_sign_packet,
1390 .check_packet = gensec_gssapi_check_packet,
1391 .seal_packet = gensec_gssapi_seal_packet,
1392 .unseal_packet = gensec_gssapi_unseal_packet,
1393 .wrap = gensec_gssapi_wrap,
1394 .unwrap = gensec_gssapi_unwrap,
1395 .have_feature = gensec_gssapi_have_feature,
1396 .enabled = False,
1397 .kerberos = True,
1398 .priority = GENSEC_GSSAPI
1399 };
1400
1401 /* As a server, this could in theory accept any GSSAPI mech */
1402 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1403 .name = "gssapi_krb5",
1404 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1405 .oid = gensec_gssapi_krb5_oids,
1406 .client_start = gensec_gssapi_client_start,
1407 .server_start = gensec_gssapi_server_start,
1408 .magic = gensec_gssapi_magic,
1409 .update = gensec_gssapi_update,
1410 .session_key = gensec_gssapi_session_key,
1411 .session_info = gensec_gssapi_session_info,
1412 .sign_packet = gensec_gssapi_sign_packet,
1413 .check_packet = gensec_gssapi_check_packet,
1414 .seal_packet = gensec_gssapi_seal_packet,
1415 .unseal_packet = gensec_gssapi_unseal_packet,
1416 .wrap = gensec_gssapi_wrap,
1417 .unwrap = gensec_gssapi_unwrap,
1418 .have_feature = gensec_gssapi_have_feature,
1419 .enabled = True,
1420 .kerberos = True,
1421 .priority = GENSEC_GSSAPI
1422 };
1423
1424 /* As a server, this could in theory accept any GSSAPI mech */
1425 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1426 .name = "gssapi_krb5_sasl",
1427 .sasl_name = "GSSAPI",
1428 .client_start = gensec_gssapi_sasl_client_start,
1429 .server_start = gensec_gssapi_sasl_server_start,
1430 .update = gensec_gssapi_update,
1431 .session_key = gensec_gssapi_session_key,
1432 .session_info = gensec_gssapi_session_info,
1433 .max_input_size = gensec_gssapi_max_input_size,
1434 .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1435 .wrap = gensec_gssapi_wrap,
1436 .unwrap = gensec_gssapi_unwrap,
1437 .have_feature = gensec_gssapi_have_feature,
1438 .enabled = True,
1439 .kerberos = True,
1440 .priority = GENSEC_GSSAPI
1441 };
1442
1443 NTSTATUS gensec_gssapi_init(void)
1444 {
1445 NTSTATUS ret;
1446
1447 ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1448 if (!NT_STATUS_IS_OK(ret)) {
1449 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1450 gensec_gssapi_spnego_security_ops.name));
1451 return ret;
1452 }
1453
1454 ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1455 if (!NT_STATUS_IS_OK(ret)) {
1456 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1457 gensec_gssapi_krb5_security_ops.name));
1458 return ret;
1459 }
1460
1461 ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1462 if (!NT_STATUS_IS_OK(ret)) {
1463 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1464 gensec_gssapi_sasl_krb5_security_ops.name));
1465 return ret;
1466 }
1467
1468 return ret;
1469 }
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