?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
param: remove unused define FN_LOCAL_PARM_CHAR()
[Samba/gebeck_regimport.git] / source3 / libads / sasl.c
blob438db05df892dbd6367a17ae6db5aebec18d26c2
1 /*
2 Unix SMB/CIFS implementation.
3 ads sasl code
4 Copyright (C) Andrew Tridgell 2001
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "includes.h"
21 #include "../libcli/auth/spnego.h"
22 #include "auth/gensec/gensec.h"
23 #include "auth_generic.h"
24 #include "ads.h"
25 #include "smb_krb5.h"
26 #include "system/gssapi.h"
27 #include "lib/param/loadparm.h"
28
29 #ifdef HAVE_LDAP
30
31 static ADS_STATUS ads_sasl_ntlmssp_wrap(ADS_STRUCT *ads, uint8 *buf, uint32 len)
32 {
33 struct gensec_security *gensec_security =
34 talloc_get_type_abort(ads->ldap.wrap_private_data,
35 struct gensec_security);
36 NTSTATUS nt_status;
37 DATA_BLOB unwrapped, wrapped;
38 TALLOC_CTX *frame = talloc_stackframe();
39
40 unwrapped = data_blob_const(buf, len);
41
42 nt_status = gensec_wrap(gensec_security, frame, &unwrapped, &wrapped);
43 if (!NT_STATUS_IS_OK(nt_status)) {
44 TALLOC_FREE(frame);
45 return ADS_ERROR_NT(nt_status);
46 }
47
48 if ((ads->ldap.out.size - 4) < wrapped.length) {
49 return ADS_ERROR_NT(NT_STATUS_INTERNAL_ERROR);
50 }
51
52 /* copy the wrapped blob to the right location */
53 memcpy(ads->ldap.out.buf + 4, wrapped.data, wrapped.length);
54
55 /* set how many bytes must be written to the underlying socket */
56 ads->ldap.out.left = 4 + wrapped.length;
57
58 TALLOC_FREE(frame);
59
60 return ADS_SUCCESS;
61 }
62
63 static ADS_STATUS ads_sasl_ntlmssp_unwrap(ADS_STRUCT *ads)
64 {
65 struct gensec_security *gensec_security =
66 talloc_get_type_abort(ads->ldap.wrap_private_data,
67 struct gensec_security);
68 NTSTATUS nt_status;
69 DATA_BLOB unwrapped, wrapped;
70 TALLOC_CTX *frame = talloc_stackframe();
71
72 wrapped = data_blob_const(ads->ldap.in.buf + 4, ads->ldap.in.ofs - 4);
73
74 nt_status = gensec_unwrap(gensec_security, frame, &wrapped, &unwrapped);
75 if (!NT_STATUS_IS_OK(nt_status)) {
76 TALLOC_FREE(frame);
77 return ADS_ERROR_NT(nt_status);
78 }
79
80 if (wrapped.length < unwrapped.length) {
81 TALLOC_FREE(frame);
82 return ADS_ERROR_NT(NT_STATUS_INTERNAL_ERROR);
83 }
84
85 /* copy the wrapped blob to the right location */
86 memcpy(ads->ldap.in.buf + 4, unwrapped.data, unwrapped.length);
87
88 /* set how many bytes must be written to the underlying socket */
89 ads->ldap.in.left = unwrapped.length;
90 ads->ldap.in.ofs = 4;
91
92 TALLOC_FREE(frame);
93
94 return ADS_SUCCESS;
95 }
96
97 static void ads_sasl_ntlmssp_disconnect(ADS_STRUCT *ads)
98 {
99 struct gensec_security *gensec_security =
100 talloc_get_type_abort(ads->ldap.wrap_private_data,
101 struct gensec_security);
102
103 TALLOC_FREE(gensec_security);
104
105 ads->ldap.wrap_ops = NULL;
106 ads->ldap.wrap_private_data = NULL;
107 }
108
109 static const struct ads_saslwrap_ops ads_sasl_ntlmssp_ops = {
110 .name = "ntlmssp",
111 .wrap = ads_sasl_ntlmssp_wrap,
112 .unwrap = ads_sasl_ntlmssp_unwrap,
113 .disconnect = ads_sasl_ntlmssp_disconnect
114 };
115
116 /*
117 perform a LDAP/SASL/SPNEGO/NTLMSSP bind (just how many layers can
118 we fit on one socket??)
119 */
120 static ADS_STATUS ads_sasl_spnego_ntlmssp_bind(ADS_STRUCT *ads)
121 {
122 DATA_BLOB msg1 = data_blob_null;
123 DATA_BLOB blob = data_blob_null;
124 DATA_BLOB blob_in = data_blob_null;
125 DATA_BLOB blob_out = data_blob_null;
126 struct berval cred, *scred = NULL;
127 int rc;
128 NTSTATUS nt_status;
129 ADS_STATUS status;
130 int turn = 1;
131
132 struct auth_generic_state *auth_generic_state;
133
134 nt_status = auth_generic_client_prepare(NULL, &auth_generic_state);
135 if (!NT_STATUS_IS_OK(nt_status)) {
136 return ADS_ERROR_NT(nt_status);
137 }
138
139 if (!NT_STATUS_IS_OK(nt_status = auth_generic_set_username(auth_generic_state, ads->auth.user_name))) {
140 return ADS_ERROR_NT(nt_status);
141 }
142 if (!NT_STATUS_IS_OK(nt_status = auth_generic_set_domain(auth_generic_state, ads->auth.realm))) {
143 return ADS_ERROR_NT(nt_status);
144 }
145 if (!NT_STATUS_IS_OK(nt_status = auth_generic_set_password(auth_generic_state, ads->auth.password))) {
146 return ADS_ERROR_NT(nt_status);
147 }
148
149 switch (ads->ldap.wrap_type) {
150 case ADS_SASLWRAP_TYPE_SEAL:
151 gensec_want_feature(auth_generic_state->gensec_security, GENSEC_FEATURE_SIGN);
152 gensec_want_feature(auth_generic_state->gensec_security, GENSEC_FEATURE_SEAL);
153 break;
154 case ADS_SASLWRAP_TYPE_SIGN:
155 if (ads->auth.flags & ADS_AUTH_SASL_FORCE) {
156 gensec_want_feature(auth_generic_state->gensec_security, GENSEC_FEATURE_SIGN);
157 } else {
158 /*
159 * windows servers are broken with sign only,
160 * so we need to use seal here too
161 */
162 gensec_want_feature(auth_generic_state->gensec_security, GENSEC_FEATURE_SIGN);
163 gensec_want_feature(auth_generic_state->gensec_security, GENSEC_FEATURE_SEAL);
164 ads->ldap.wrap_type = ADS_SASLWRAP_TYPE_SEAL;
165 }
166 break;
167 case ADS_SASLWRAP_TYPE_PLAIN:
168 break;
169 }
170
171 nt_status = auth_generic_client_start(auth_generic_state, GENSEC_OID_NTLMSSP);
172 if (!NT_STATUS_IS_OK(nt_status)) {
173 return ADS_ERROR_NT(nt_status);
174 }
175
176 blob_in = data_blob_null;
177
178 do {
179 nt_status = gensec_update(auth_generic_state->gensec_security,
180 talloc_tos(), NULL, blob_in, &blob_out);
181 data_blob_free(&blob_in);
182 if ((NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
183 || NT_STATUS_IS_OK(nt_status))
184 && blob_out.length) {
185 if (turn == 1) {
186 const char *OIDs_ntlm[] = {OID_NTLMSSP, NULL};
187 /* and wrap it in a SPNEGO wrapper */
188 msg1 = spnego_gen_negTokenInit(talloc_tos(),
189 OIDs_ntlm, &blob_out, NULL);
190 } else {
191 /* wrap it in SPNEGO */
192 msg1 = spnego_gen_auth(talloc_tos(), blob_out);
193 }
194
195 data_blob_free(&blob_out);
196
197 cred.bv_val = (char *)msg1.data;
198 cred.bv_len = msg1.length;
199 scred = NULL;
200 rc = ldap_sasl_bind_s(ads->ldap.ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred);
201 data_blob_free(&msg1);
202 if ((rc != LDAP_SASL_BIND_IN_PROGRESS) && (rc != 0)) {
203 if (scred) {
204 ber_bvfree(scred);
205 }
206
207 TALLOC_FREE(auth_generic_state);
208 return ADS_ERROR(rc);
209 }
210 if (scred) {
211 blob = data_blob(scred->bv_val, scred->bv_len);
212 ber_bvfree(scred);
213 } else {
214 blob = data_blob_null;
215 }
216
217 } else {
218
219 TALLOC_FREE(auth_generic_state);
220 data_blob_free(&blob_out);
221 return ADS_ERROR_NT(nt_status);
222 }
223
224 if ((turn == 1) &&
225 (rc == LDAP_SASL_BIND_IN_PROGRESS)) {
226 DATA_BLOB tmp_blob = data_blob_null;
227 /* the server might give us back two challenges */
228 if (!spnego_parse_challenge(talloc_tos(), blob, &blob_in,
229 &tmp_blob)) {
230
231 TALLOC_FREE(auth_generic_state);
232 data_blob_free(&blob);
233 DEBUG(3,("Failed to parse challenges\n"));
234 return ADS_ERROR_NT(NT_STATUS_INVALID_PARAMETER);
235 }
236 data_blob_free(&tmp_blob);
237 } else if (rc == LDAP_SASL_BIND_IN_PROGRESS) {
238 if (!spnego_parse_auth_response(talloc_tos(), blob, nt_status, OID_NTLMSSP,
239 &blob_in)) {
240
241 TALLOC_FREE(auth_generic_state);
242 data_blob_free(&blob);
243 DEBUG(3,("Failed to parse auth response\n"));
244 return ADS_ERROR_NT(NT_STATUS_INVALID_PARAMETER);
245 }
246 }
247 data_blob_free(&blob);
248 data_blob_free(&blob_out);
249 turn++;
250 } while (rc == LDAP_SASL_BIND_IN_PROGRESS && !NT_STATUS_IS_OK(nt_status));
251
252 if (ads->ldap.wrap_type > ADS_SASLWRAP_TYPE_PLAIN) {
253 uint32_t sig_size = gensec_sig_size(auth_generic_state->gensec_security, 0);
254 ads->ldap.out.max_unwrapped = ADS_SASL_WRAPPING_OUT_MAX_WRAPPED - sig_size;
255 ads->ldap.out.sig_size = sig_size;
256 ads->ldap.in.min_wrapped = ads->ldap.out.sig_size;
257 ads->ldap.in.max_wrapped = ADS_SASL_WRAPPING_IN_MAX_WRAPPED;
258 status = ads_setup_sasl_wrapping(ads, &ads_sasl_ntlmssp_ops, auth_generic_state->gensec_security);
259 if (!ADS_ERR_OK(status)) {
260 DEBUG(0, ("ads_setup_sasl_wrapping() failed: %s\n",
261 ads_errstr(status)));
262 TALLOC_FREE(auth_generic_state);
263 return status;
264 }
265 /* Only keep the gensec_security element around long-term */
266 talloc_steal(NULL, auth_generic_state->gensec_security);
267 }
268 TALLOC_FREE(auth_generic_state);
269
270 return ADS_ERROR(rc);
271 }
272
273 #ifdef HAVE_KRB5
274 static ADS_STATUS ads_sasl_gssapi_wrap(ADS_STRUCT *ads, uint8 *buf, uint32 len)
275 {
276 gss_ctx_id_t context_handle = (gss_ctx_id_t)ads->ldap.wrap_private_data;
277 ADS_STATUS status;
278 int gss_rc;
279 uint32 minor_status;
280 gss_buffer_desc unwrapped, wrapped;
281 int conf_req_flag, conf_state;
282
283 unwrapped.value = buf;
284 unwrapped.length = len;
285
286 /* for now request sign and seal */
287 conf_req_flag = (ads->ldap.wrap_type == ADS_SASLWRAP_TYPE_SEAL);
288
289 gss_rc = gss_wrap(&minor_status, context_handle,
290 conf_req_flag, GSS_C_QOP_DEFAULT,
291 &unwrapped, &conf_state,
292 &wrapped);
293 status = ADS_ERROR_GSS(gss_rc, minor_status);
294 if (!ADS_ERR_OK(status)) return status;
295
296 if (conf_req_flag && conf_state == 0) {
297 return ADS_ERROR_NT(NT_STATUS_ACCESS_DENIED);
298 }
299
300 if ((ads->ldap.out.size - 4) < wrapped.length) {
301 return ADS_ERROR_NT(NT_STATUS_INTERNAL_ERROR);
302 }
303
304 /* copy the wrapped blob to the right location */
305 memcpy(ads->ldap.out.buf + 4, wrapped.value, wrapped.length);
306
307 /* set how many bytes must be written to the underlying socket */
308 ads->ldap.out.left = 4 + wrapped.length;
309
310 gss_release_buffer(&minor_status, &wrapped);
311
312 return ADS_SUCCESS;
313 }
314
315 static ADS_STATUS ads_sasl_gssapi_unwrap(ADS_STRUCT *ads)
316 {
317 gss_ctx_id_t context_handle = (gss_ctx_id_t)ads->ldap.wrap_private_data;
318 ADS_STATUS status;
319 int gss_rc;
320 uint32 minor_status;
321 gss_buffer_desc unwrapped, wrapped;
322 int conf_state;
323
324 wrapped.value = ads->ldap.in.buf + 4;
325 wrapped.length = ads->ldap.in.ofs - 4;
326
327 gss_rc = gss_unwrap(&minor_status, context_handle,
328 &wrapped, &unwrapped,
329 &conf_state, GSS_C_QOP_DEFAULT);
330 status = ADS_ERROR_GSS(gss_rc, minor_status);
331 if (!ADS_ERR_OK(status)) return status;
332
333 if (ads->ldap.wrap_type == ADS_SASLWRAP_TYPE_SEAL && conf_state == 0) {
334 return ADS_ERROR_NT(NT_STATUS_ACCESS_DENIED);
335 }
336
337 if (wrapped.length < unwrapped.length) {
338 return ADS_ERROR_NT(NT_STATUS_INTERNAL_ERROR);
339 }
340
341 /* copy the wrapped blob to the right location */
342 memcpy(ads->ldap.in.buf + 4, unwrapped.value, unwrapped.length);
343
344 /* set how many bytes must be written to the underlying socket */
345 ads->ldap.in.left = unwrapped.length;
346 ads->ldap.in.ofs = 4;
347
348 gss_release_buffer(&minor_status, &unwrapped);
349
350 return ADS_SUCCESS;
351 }
352
353 static void ads_sasl_gssapi_disconnect(ADS_STRUCT *ads)
354 {
355 gss_ctx_id_t context_handle = (gss_ctx_id_t)ads->ldap.wrap_private_data;
356 uint32 minor_status;
357
358 gss_delete_sec_context(&minor_status, &context_handle, GSS_C_NO_BUFFER);
359
360 ads->ldap.wrap_ops = NULL;
361 ads->ldap.wrap_private_data = NULL;
362 }
363
364 static const struct ads_saslwrap_ops ads_sasl_gssapi_ops = {
365 .name = "gssapi",
366 .wrap = ads_sasl_gssapi_wrap,
367 .unwrap = ads_sasl_gssapi_unwrap,
368 .disconnect = ads_sasl_gssapi_disconnect
369 };
370
371 /*
372 perform a LDAP/SASL/SPNEGO/GSSKRB5 bind
373 */
374 static ADS_STATUS ads_sasl_spnego_gsskrb5_bind(ADS_STRUCT *ads, const gss_name_t serv_name)
375 {
376 ADS_STATUS status;
377 bool ok;
378 uint32 minor_status;
379 int gss_rc, rc;
380 gss_OID_desc krb5_mech_type =
381 {9, discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02") };
382 gss_OID mech_type = &krb5_mech_type;
383 gss_OID actual_mech_type = GSS_C_NULL_OID;
384 const char *spnego_mechs[] = {OID_KERBEROS5_OLD, OID_KERBEROS5, OID_NTLMSSP, NULL};
385 gss_ctx_id_t context_handle = GSS_C_NO_CONTEXT;
386 gss_buffer_desc input_token, output_token;
387 uint32 req_flags, ret_flags;
388 uint32 req_tmp, ret_tmp;
389 DATA_BLOB unwrapped;
390 DATA_BLOB wrapped;
391 struct berval cred, *scred = NULL;
392
393 input_token.value = NULL;
394 input_token.length = 0;
395
396 req_flags = GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG;
397 switch (ads->ldap.wrap_type) {
398 case ADS_SASLWRAP_TYPE_SEAL:
399 req_flags |= GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG;
400 break;
401 case ADS_SASLWRAP_TYPE_SIGN:
402 req_flags |= GSS_C_INTEG_FLAG;
403 break;
404 case ADS_SASLWRAP_TYPE_PLAIN:
405 break;
406 }
407
408 /* Note: here we explicit ask for the krb5 mech_type */
409 gss_rc = gss_init_sec_context(&minor_status,
410 GSS_C_NO_CREDENTIAL,
411 &context_handle,
412 serv_name,
413 mech_type,
414 req_flags,
415 0,
416 NULL,
417 &input_token,
418 &actual_mech_type,
419 &output_token,
420 &ret_flags,
421 NULL);
422 if (gss_rc && gss_rc != GSS_S_CONTINUE_NEEDED) {
423 status = ADS_ERROR_GSS(gss_rc, minor_status);
424 goto failed;
425 }
426
427 /*
428 * As some gssapi krb5 mech implementations
429 * automaticly add GSS_C_INTEG_FLAG and GSS_C_CONF_FLAG
430 * to req_flags internaly, it's not possible to
431 * use plain or signing only connection via
432 * the gssapi interface.
433 *
434 * Because of this we need to check it the ret_flags
435 * has more flags as req_flags and correct the value
436 * of ads->ldap.wrap_type.
437 *
438 * I ads->auth.flags has ADS_AUTH_SASL_FORCE
439 * we need to give an error.
440 */
441 req_tmp = req_flags & (GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
442 ret_tmp = ret_flags & (GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
443
444 if (req_tmp == ret_tmp) {
445 /* everythings fine... */
446
447 } else if (req_flags & GSS_C_CONF_FLAG) {
448 /*
449 * here we wanted sealing but didn't got it
450 * from the gssapi library
451 */
452 status = ADS_ERROR_NT(NT_STATUS_NOT_SUPPORTED);
453 goto failed;
454
455 } else if ((req_flags & GSS_C_INTEG_FLAG) &&
456 !(ret_flags & GSS_C_INTEG_FLAG)) {
457 /*
458 * here we wanted siging but didn't got it
459 * from the gssapi library
460 */
461 status = ADS_ERROR_NT(NT_STATUS_NOT_SUPPORTED);
462 goto failed;
463
464 } else if (ret_flags & GSS_C_CONF_FLAG) {
465 /*
466 * here we didn't want sealing
467 * but the gssapi library forces it
468 * so correct the needed wrap_type if
469 * the caller didn't forced siging only
470 */
471 if (ads->auth.flags & ADS_AUTH_SASL_FORCE) {
472 status = ADS_ERROR_NT(NT_STATUS_NOT_SUPPORTED);
473 goto failed;
474 }
475
476 ads->ldap.wrap_type = ADS_SASLWRAP_TYPE_SEAL;
477 req_flags = ret_flags;
478
479 } else if (ret_flags & GSS_C_INTEG_FLAG) {
480 /*
481 * here we didn't want signing
482 * but the gssapi library forces it
483 * so correct the needed wrap_type if
484 * the caller didn't forced plain
485 */
486 if (ads->auth.flags & ADS_AUTH_SASL_FORCE) {
487 status = ADS_ERROR_NT(NT_STATUS_NOT_SUPPORTED);
488 goto failed;
489 }
490
491 ads->ldap.wrap_type = ADS_SASLWRAP_TYPE_SIGN;
492 req_flags = ret_flags;
493 } else {
494 /*
495 * This could (should?) not happen
496 */
497 status = ADS_ERROR_NT(NT_STATUS_INTERNAL_ERROR);
498 goto failed;
499
500 }
501
502 /* and wrap that in a shiny SPNEGO wrapper */
503 unwrapped = data_blob_const(output_token.value, output_token.length);
504 wrapped = spnego_gen_negTokenInit(talloc_tos(),
505 spnego_mechs, &unwrapped, NULL);
506 gss_release_buffer(&minor_status, &output_token);
507 if (unwrapped.length > wrapped.length) {
508 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
509 goto failed;
510 }
511
512 cred.bv_val = (char *)wrapped.data;
513 cred.bv_len = wrapped.length;
514
515 rc = ldap_sasl_bind_s(ads->ldap.ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL,
516 &scred);
517 data_blob_free(&wrapped);
518 if (rc != LDAP_SUCCESS) {
519 status = ADS_ERROR(rc);
520 goto failed;
521 }
522
523 if (scred) {
524 wrapped = data_blob_const(scred->bv_val, scred->bv_len);
525 } else {
526 wrapped = data_blob_null;
527 }
528
529 ok = spnego_parse_auth_response(talloc_tos(), wrapped, NT_STATUS_OK,
530 OID_KERBEROS5_OLD,
531 &unwrapped);
532 if (scred) ber_bvfree(scred);
533 if (!ok) {
534 status = ADS_ERROR_NT(NT_STATUS_INVALID_NETWORK_RESPONSE);
535 goto failed;
536 }
537
538 input_token.value = unwrapped.data;
539 input_token.length = unwrapped.length;
540
541 /*
542 * As we asked for mutal authentication
543 * we need to pass the servers response
544 * to gssapi
545 */
546 gss_rc = gss_init_sec_context(&minor_status,
547 GSS_C_NO_CREDENTIAL,
548 &context_handle,
549 serv_name,
550 mech_type,
551 req_flags,
552 0,
553 NULL,
554 &input_token,
555 &actual_mech_type,
556 &output_token,
557 &ret_flags,
558 NULL);
559 data_blob_free(&unwrapped);
560 if (gss_rc) {
561 status = ADS_ERROR_GSS(gss_rc, minor_status);
562 goto failed;
563 }
564
565 gss_release_buffer(&minor_status, &output_token);
566
567 /*
568 * If we the sign and seal options
569 * doesn't match after getting the response
570 * from the server, we don't want to use the connection
571 */
572 req_tmp = req_flags & (GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
573 ret_tmp = ret_flags & (GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
574
575 if (req_tmp != ret_tmp) {
576 /* everythings fine... */
577 status = ADS_ERROR_NT(NT_STATUS_INVALID_NETWORK_RESPONSE);
578 goto failed;
579 }
580
581 if (ads->ldap.wrap_type > ADS_SASLWRAP_TYPE_PLAIN) {
582 uint32 max_msg_size = ADS_SASL_WRAPPING_OUT_MAX_WRAPPED;
583
584 gss_rc = gss_wrap_size_limit(&minor_status, context_handle,
585 (ads->ldap.wrap_type == ADS_SASLWRAP_TYPE_SEAL),
586 GSS_C_QOP_DEFAULT,
587 max_msg_size, &ads->ldap.out.max_unwrapped);
588 if (gss_rc) {
589 status = ADS_ERROR_GSS(gss_rc, minor_status);
590 goto failed;
591 }
592
593 ads->ldap.out.sig_size = max_msg_size - ads->ldap.out.max_unwrapped;
594 ads->ldap.in.min_wrapped = 0x2C; /* taken from a capture with LDAP unbind */
595 ads->ldap.in.max_wrapped = max_msg_size;
596 status = ads_setup_sasl_wrapping(ads, &ads_sasl_gssapi_ops, context_handle);
597 if (!ADS_ERR_OK(status)) {
598 DEBUG(0, ("ads_setup_sasl_wrapping() failed: %s\n",
599 ads_errstr(status)));
600 goto failed;
601 }
602 /* make sure we don't free context_handle */
603 context_handle = GSS_C_NO_CONTEXT;
604 }
605
606 status = ADS_SUCCESS;
607
608 failed:
609 if (context_handle != GSS_C_NO_CONTEXT)
610 gss_delete_sec_context(&minor_status, &context_handle, GSS_C_NO_BUFFER);
611 return status;
612 }
613
614 #endif /* HAVE_KRB5 */
615
616 #ifdef HAVE_KRB5
617 struct ads_service_principal {
618 char *string;
619 #ifdef HAVE_KRB5
620 gss_name_t name;
621 #endif
622 };
623
624 static void ads_free_service_principal(struct ads_service_principal *p)
625 {
626 SAFE_FREE(p->string);
627
628 #ifdef HAVE_KRB5
629 if (p->name) {
630 uint32 minor_status;
631 gss_release_name(&minor_status, &p->name);
632 }
633 #endif
634 ZERO_STRUCTP(p);
635 }
636
637
638 static ADS_STATUS ads_guess_service_principal(ADS_STRUCT *ads,
639 char **returned_principal)
640 {
641 char *princ = NULL;
642
643 if (ads->server.realm && ads->server.ldap_server) {
644 char *server, *server_realm;
645
646 server = SMB_STRDUP(ads->server.ldap_server);
647 server_realm = SMB_STRDUP(ads->server.realm);
648
649 if (!server || !server_realm) {
650 SAFE_FREE(server);
651 SAFE_FREE(server_realm);
652 return ADS_ERROR(LDAP_NO_MEMORY);
653 }
654
655 if (!strlower_m(server)) {
656 SAFE_FREE(server);
657 SAFE_FREE(server_realm);
658 return ADS_ERROR(LDAP_NO_MEMORY);
659 }
660
661 if (!strupper_m(server_realm)) {
662 SAFE_FREE(server);
663 SAFE_FREE(server_realm);
664 return ADS_ERROR(LDAP_NO_MEMORY);
665 }
666
667 if (asprintf(&princ, "ldap/%s@%s", server, server_realm) == -1) {
668 SAFE_FREE(server);
669 SAFE_FREE(server_realm);
670 return ADS_ERROR(LDAP_NO_MEMORY);
671 }
672
673 SAFE_FREE(server);
674 SAFE_FREE(server_realm);
675
676 if (!princ) {
677 return ADS_ERROR(LDAP_NO_MEMORY);
678 }
679 } else if (ads->config.realm && ads->config.ldap_server_name) {
680 char *server, *server_realm;
681
682 server = SMB_STRDUP(ads->config.ldap_server_name);
683 server_realm = SMB_STRDUP(ads->config.realm);
684
685 if (!server || !server_realm) {
686 SAFE_FREE(server);
687 SAFE_FREE(server_realm);
688 return ADS_ERROR(LDAP_NO_MEMORY);
689 }
690
691 if (!strlower_m(server)) {
692 SAFE_FREE(server);
693 SAFE_FREE(server_realm);
694 return ADS_ERROR(LDAP_NO_MEMORY);
695 }
696
697 if (!strupper_m(server_realm)) {
698 SAFE_FREE(server);
699 SAFE_FREE(server_realm);
700 return ADS_ERROR(LDAP_NO_MEMORY);
701 }
702 if (asprintf(&princ, "ldap/%s@%s", server, server_realm) == -1) {
703 SAFE_FREE(server);
704 SAFE_FREE(server_realm);
705 return ADS_ERROR(LDAP_NO_MEMORY);
706 }
707
708 SAFE_FREE(server);
709 SAFE_FREE(server_realm);
710
711 if (!princ) {
712 return ADS_ERROR(LDAP_NO_MEMORY);
713 }
714 }
715
716 if (!princ) {
717 return ADS_ERROR(LDAP_PARAM_ERROR);
718 }
719
720 *returned_principal = princ;
721
722 return ADS_SUCCESS;
723 }
724
725 static ADS_STATUS ads_generate_service_principal(ADS_STRUCT *ads,
726 const char *given_principal,
727 struct ads_service_principal *p)
728 {
729 ADS_STATUS status;
730 #ifdef HAVE_KRB5
731 gss_buffer_desc input_name;
732 /* GSS_KRB5_NT_PRINCIPAL_NAME */
733 gss_OID_desc nt_principal =
734 {10, discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x01")};
735 uint32 minor_status;
736 int gss_rc;
737 #endif
738
739 ZERO_STRUCTP(p);
740
741 /* I've seen a child Windows 2000 domain not send
742 the principal name back in the first round of
743 the SASL bind reply. So we guess based on server
744 name and realm. --jerry */
745 /* Also try best guess when we get the w2k8 ignore principal
746 back, or when we are configured to ignore it - gd,
747 abartlet */
748
749 if (!lp_client_use_spnego_principal() ||
750 !given_principal ||
751 strequal(given_principal, ADS_IGNORE_PRINCIPAL)) {
752
753 status = ads_guess_service_principal(ads, &p->string);
754 if (!ADS_ERR_OK(status)) {
755 return status;
756 }
757 } else {
758 p->string = SMB_STRDUP(given_principal);
759 if (!p->string) {
760 return ADS_ERROR(LDAP_NO_MEMORY);
761 }
762 }
763
764 #ifdef HAVE_KRB5
765 input_name.value = p->string;
766 input_name.length = strlen(p->string);
767
768 gss_rc = gss_import_name(&minor_status, &input_name, &nt_principal, &p->name);
769 if (gss_rc) {
770 ads_free_service_principal(p);
771 return ADS_ERROR_GSS(gss_rc, minor_status);
772 }
773 #endif
774
775 return ADS_SUCCESS;
776 }
777
778 /*
779 perform a LDAP/SASL/SPNEGO/KRB5 bind
780 */
781 static ADS_STATUS ads_sasl_spnego_rawkrb5_bind(ADS_STRUCT *ads, const char *principal)
782 {
783 DATA_BLOB blob = data_blob_null;
784 struct berval cred, *scred = NULL;
785 DATA_BLOB session_key = data_blob_null;
786 int rc;
787
788 if (ads->ldap.wrap_type > ADS_SASLWRAP_TYPE_PLAIN) {
789 return ADS_ERROR_NT(NT_STATUS_NOT_SUPPORTED);
790 }
791
792 rc = spnego_gen_krb5_negTokenInit(talloc_tos(), principal,
793 ads->auth.time_offset, &blob, &session_key, 0,
794 &ads->auth.tgs_expire);
795
796 if (rc) {
797 return ADS_ERROR_KRB5(rc);
798 }
799
800 /* now send the auth packet and we should be done */
801 cred.bv_val = (char *)blob.data;
802 cred.bv_len = blob.length;
803
804 rc = ldap_sasl_bind_s(ads->ldap.ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred);
805
806 data_blob_free(&blob);
807 data_blob_free(&session_key);
808 if(scred)
809 ber_bvfree(scred);
810
811 return ADS_ERROR(rc);
812 }
813
814 static ADS_STATUS ads_sasl_spnego_krb5_bind(ADS_STRUCT *ads,
815 struct ads_service_principal *p)
816 {
817 #ifdef HAVE_KRB5
818 /*
819 * we only use the gsskrb5 based implementation
820 * when sasl sign or seal is requested.
821 *
822 * This has the following reasons:
823 * - it's likely that the gssapi krb5 mech implementation
824 * doesn't support to negotiate plain connections
825 * - the ads_sasl_spnego_rawkrb5_bind is more robust
826 * against clock skew errors
827 */
828 if (ads->ldap.wrap_type > ADS_SASLWRAP_TYPE_PLAIN) {
829 return ads_sasl_spnego_gsskrb5_bind(ads, p->name);
830 }
831 #endif
832 return ads_sasl_spnego_rawkrb5_bind(ads, p->string);
833 }
834 #endif /* HAVE_KRB5 */
835
836 /*
837 this performs a SASL/SPNEGO bind
838 */
839 static ADS_STATUS ads_sasl_spnego_bind(ADS_STRUCT *ads)
840 {
841 struct berval *scred=NULL;
842 int rc, i;
843 ADS_STATUS status;
844 DATA_BLOB blob;
845 char *given_principal = NULL;
846 char *OIDs[ASN1_MAX_OIDS];
847 #ifdef HAVE_KRB5
848 bool got_kerberos_mechanism = False;
849 #endif
850
851 rc = ldap_sasl_bind_s(ads->ldap.ld, NULL, "GSS-SPNEGO", NULL, NULL, NULL, &scred);
852
853 if (rc != LDAP_SASL_BIND_IN_PROGRESS) {
854 status = ADS_ERROR(rc);
855 goto failed;
856 }
857
858 blob = data_blob(scred->bv_val, scred->bv_len);
859
860 ber_bvfree(scred);
861
862 #if 0
863 file_save("sasl_spnego.dat", blob.data, blob.length);
864 #endif
865
866 /* the server sent us the first part of the SPNEGO exchange in the negprot
867 reply */
868 if (!spnego_parse_negTokenInit(talloc_tos(), blob, OIDs, &given_principal, NULL) ||
869 OIDs[0] == NULL) {
870 data_blob_free(&blob);
871 status = ADS_ERROR(LDAP_OPERATIONS_ERROR);
872 goto failed;
873 }
874 data_blob_free(&blob);
875
876 /* make sure the server understands kerberos */
877 for (i=0;OIDs[i];i++) {
878 DEBUG(3,("ads_sasl_spnego_bind: got OID=%s\n", OIDs[i]));
879 #ifdef HAVE_KRB5
880 if (strcmp(OIDs[i], OID_KERBEROS5_OLD) == 0 ||
881 strcmp(OIDs[i], OID_KERBEROS5) == 0) {
882 got_kerberos_mechanism = True;
883 }
884 #endif
885 talloc_free(OIDs[i]);
886 }
887 DEBUG(3,("ads_sasl_spnego_bind: got server principal name = %s\n", given_principal));
888
889 #ifdef HAVE_KRB5
890 if (!(ads->auth.flags & ADS_AUTH_DISABLE_KERBEROS) &&
891 got_kerberos_mechanism)
892 {
893 struct ads_service_principal p;
894
895 status = ads_generate_service_principal(ads, given_principal, &p);
896 TALLOC_FREE(given_principal);
897 if (!ADS_ERR_OK(status)) {
898 return status;
899 }
900
901 status = ads_sasl_spnego_krb5_bind(ads, &p);
902 if (ADS_ERR_OK(status)) {
903 ads_free_service_principal(&p);
904 return status;
905 }
906
907 DEBUG(10,("ads_sasl_spnego_krb5_bind failed with: %s, "
908 "calling kinit\n", ads_errstr(status)));
909
910 status = ADS_ERROR_KRB5(ads_kinit_password(ads));
911
912 if (ADS_ERR_OK(status)) {
913 status = ads_sasl_spnego_krb5_bind(ads, &p);
914 if (!ADS_ERR_OK(status)) {
915 DEBUG(0,("kinit succeeded but "
916 "ads_sasl_spnego_krb5_bind failed: %s\n",
917 ads_errstr(status)));
918 }
919 }
920
921 ads_free_service_principal(&p);
922
923 /* only fallback to NTLMSSP if allowed */
924 if (ADS_ERR_OK(status) ||
925 !(ads->auth.flags & ADS_AUTH_ALLOW_NTLMSSP)) {
926 return status;
927 }
928 } else
929 #endif
930 {
931 TALLOC_FREE(given_principal);
932 }
933
934 /* lets do NTLMSSP ... this has the big advantage that we don't need
935 to sync clocks, and we don't rely on special versions of the krb5
936 library for HMAC_MD4 encryption */
937 return ads_sasl_spnego_ntlmssp_bind(ads);
938
939 failed:
940 return status;
941 }
942
943 #ifdef HAVE_KRB5
944 #define MAX_GSS_PASSES 3
945
946 /* this performs a SASL/gssapi bind
947 we avoid using cyrus-sasl to make Samba more robust. cyrus-sasl
948 is very dependent on correctly configured DNS whereas
949 this routine is much less fragile
950 see RFC2078 and RFC2222 for details
951 */
952 static ADS_STATUS ads_sasl_gssapi_do_bind(ADS_STRUCT *ads, const gss_name_t serv_name)
953 {
954 uint32 minor_status;
955 gss_ctx_id_t context_handle = GSS_C_NO_CONTEXT;
956 gss_OID mech_type = GSS_C_NULL_OID;
957 gss_buffer_desc output_token, input_token;
958 uint32 req_flags, ret_flags;
959 int conf_state;
960 struct berval cred;
961 struct berval *scred = NULL;
962 int i=0;
963 int gss_rc, rc;
964 uint8 *p;
965 uint32 max_msg_size = ADS_SASL_WRAPPING_OUT_MAX_WRAPPED;
966 uint8 wrap_type = ADS_SASLWRAP_TYPE_PLAIN;
967 ADS_STATUS status;
968
969 input_token.value = NULL;
970 input_token.length = 0;
971
972 /*
973 * Note: here we always ask the gssapi for sign and seal
974 * as this is negotiated later after the mutal
975 * authentication
976 */
977 req_flags = GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG | GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG;
978
979 for (i=0; i < MAX_GSS_PASSES; i++) {
980 gss_rc = gss_init_sec_context(&minor_status,
981 GSS_C_NO_CREDENTIAL,
982 &context_handle,
983 serv_name,
984 mech_type,
985 req_flags,
986 0,
987 NULL,
988 &input_token,
989 NULL,
990 &output_token,
991 &ret_flags,
992 NULL);
993 if (scred) {
994 ber_bvfree(scred);
995 scred = NULL;
996 }
997 if (gss_rc && gss_rc != GSS_S_CONTINUE_NEEDED) {
998 status = ADS_ERROR_GSS(gss_rc, minor_status);
999 goto failed;
1000 }
1001
1002 cred.bv_val = (char *)output_token.value;
1003 cred.bv_len = output_token.length;
1004
1005 rc = ldap_sasl_bind_s(ads->ldap.ld, NULL, "GSSAPI", &cred, NULL, NULL,
1006 &scred);
1007 if (rc != LDAP_SASL_BIND_IN_PROGRESS) {
1008 status = ADS_ERROR(rc);
1009 goto failed;
1010 }
1011
1012 if (output_token.value) {
1013 gss_release_buffer(&minor_status, &output_token);
1014 }
1015
1016 if (scred) {
1017 input_token.value = scred->bv_val;
1018 input_token.length = scred->bv_len;
1019 } else {
1020 input_token.value = NULL;
1021 input_token.length = 0;
1022 }
1023
1024 if (gss_rc == 0) break;
1025 }
1026
1027 gss_rc = gss_unwrap(&minor_status,context_handle,&input_token,&output_token,
1028 &conf_state,NULL);
1029 if (scred) {
1030 ber_bvfree(scred);
1031 scred = NULL;
1032 }
1033 if (gss_rc) {
1034 status = ADS_ERROR_GSS(gss_rc, minor_status);
1035 goto failed;
1036 }
1037
1038 p = (uint8 *)output_token.value;
1039
1040 #if 0
1041 file_save("sasl_gssapi.dat", output_token.value, output_token.length);
1042 #endif
1043
1044 if (p) {
1045 wrap_type = CVAL(p,0);
1046 SCVAL(p,0,0);
1047 max_msg_size = RIVAL(p,0);
1048 }
1049
1050 gss_release_buffer(&minor_status, &output_token);
1051
1052 if (!(wrap_type & ads->ldap.wrap_type)) {
1053 /*
1054 * the server doesn't supports the wrap
1055 * type we want :-(
1056 */
1057 DEBUG(0,("The ldap sasl wrap type doesn't match wanted[%d] server[%d]\n",
1058 ads->ldap.wrap_type, wrap_type));
1059 DEBUGADD(0,("You may want to set the 'client ldap sasl wrapping' option\n"));
1060 status = ADS_ERROR_NT(NT_STATUS_NOT_SUPPORTED);
1061 goto failed;
1062 }
1063
1064 /* 0x58 is the minimum windows accepts */
1065 if (max_msg_size < 0x58) {
1066 max_msg_size = 0x58;
1067 }
1068
1069 output_token.length = 4;
1070 output_token.value = SMB_MALLOC(output_token.length);
1071 if (!output_token.value) {
1072 output_token.length = 0;
1073 status = ADS_ERROR_NT(NT_STATUS_NO_MEMORY);
1074 goto failed;
1075 }
1076 p = (uint8 *)output_token.value;
1077
1078 RSIVAL(p,0,max_msg_size);
1079 SCVAL(p,0,ads->ldap.wrap_type);
1080
1081 /*
1082 * we used to add sprintf("dn:%s", ads->config.bind_path) here.
1083 * but using ads->config.bind_path is the wrong! It should be
1084 * the DN of the user object!
1085 *
1086 * w2k3 gives an error when we send an incorrect DN, but sending nothing
1087 * is ok and matches the information flow used in GSS-SPNEGO.
1088 */
1089
1090 gss_rc = gss_wrap(&minor_status, context_handle,0,GSS_C_QOP_DEFAULT,
1091 &output_token, /* used as *input* here. */
1092 &conf_state,
1093 &input_token); /* Used as *output* here. */
1094 if (gss_rc) {
1095 status = ADS_ERROR_GSS(gss_rc, minor_status);
1096 output_token.length = 0;
1097 SAFE_FREE(output_token.value);
1098 goto failed;
1099 }
1100
1101 /* We've finished with output_token. */
1102 SAFE_FREE(output_token.value);
1103 output_token.length = 0;
1104
1105 cred.bv_val = (char *)input_token.value;
1106 cred.bv_len = input_token.length;
1107
1108 rc = ldap_sasl_bind_s(ads->ldap.ld, NULL, "GSSAPI", &cred, NULL, NULL,
1109 &scred);
1110 gss_release_buffer(&minor_status, &input_token);
1111 status = ADS_ERROR(rc);
1112 if (!ADS_ERR_OK(status)) {
1113 goto failed;
1114 }
1115
1116 if (ads->ldap.wrap_type > ADS_SASLWRAP_TYPE_PLAIN) {
1117 gss_rc = gss_wrap_size_limit(&minor_status, context_handle,
1118 (ads->ldap.wrap_type == ADS_SASLWRAP_TYPE_SEAL),
1119 GSS_C_QOP_DEFAULT,
1120 max_msg_size, &ads->ldap.out.max_unwrapped);
1121 if (gss_rc) {
1122 status = ADS_ERROR_GSS(gss_rc, minor_status);
1123 goto failed;
1124 }
1125
1126 ads->ldap.out.sig_size = max_msg_size - ads->ldap.out.max_unwrapped;
1127 ads->ldap.in.min_wrapped = 0x2C; /* taken from a capture with LDAP unbind */
1128 ads->ldap.in.max_wrapped = max_msg_size;
1129 status = ads_setup_sasl_wrapping(ads, &ads_sasl_gssapi_ops, context_handle);
1130 if (!ADS_ERR_OK(status)) {
1131 DEBUG(0, ("ads_setup_sasl_wrapping() failed: %s\n",
1132 ads_errstr(status)));
1133 goto failed;
1134 }
1135 /* make sure we don't free context_handle */
1136 context_handle = GSS_C_NO_CONTEXT;
1137 }
1138
1139 failed:
1140
1141 if (context_handle != GSS_C_NO_CONTEXT)
1142 gss_delete_sec_context(&minor_status, &context_handle, GSS_C_NO_BUFFER);
1143
1144 if(scred)
1145 ber_bvfree(scred);
1146 return status;
1147 }
1148
1149 static ADS_STATUS ads_sasl_gssapi_bind(ADS_STRUCT *ads)
1150 {
1151 ADS_STATUS status;
1152 struct ads_service_principal p;
1153
1154 status = ads_generate_service_principal(ads, NULL, &p);
1155 if (!ADS_ERR_OK(status)) {
1156 return status;
1157 }
1158
1159 status = ads_sasl_gssapi_do_bind(ads, p.name);
1160 if (ADS_ERR_OK(status)) {
1161 ads_free_service_principal(&p);
1162 return status;
1163 }
1164
1165 DEBUG(10,("ads_sasl_gssapi_do_bind failed with: %s, "
1166 "calling kinit\n", ads_errstr(status)));
1167
1168 status = ADS_ERROR_KRB5(ads_kinit_password(ads));
1169
1170 if (ADS_ERR_OK(status)) {
1171 status = ads_sasl_gssapi_do_bind(ads, p.name);
1172 }
1173
1174 ads_free_service_principal(&p);
1175
1176 return status;
1177 }
1178
1179 #endif /* HAVE_KRB5 */
1180
1181 /* mapping between SASL mechanisms and functions */
1182 static struct {
1183 const char *name;
1184 ADS_STATUS (*fn)(ADS_STRUCT *);
1185 } sasl_mechanisms[] = {
1186 {"GSS-SPNEGO", ads_sasl_spnego_bind},
1187 #ifdef HAVE_KRB5
1188 {"GSSAPI", ads_sasl_gssapi_bind}, /* doesn't work with .NET RC1. No idea why */
1189 #endif
1190 {NULL, NULL}
1191 };
1192
1193 ADS_STATUS ads_sasl_bind(ADS_STRUCT *ads)
1194 {
1195 const char *attrs[] = {"supportedSASLMechanisms", NULL};
1196 char **values;
1197 ADS_STATUS status;
1198 int i, j;
1199 LDAPMessage *res;
1200
1201 /* get a list of supported SASL mechanisms */
1202 status = ads_do_search(ads, "", LDAP_SCOPE_BASE, "(objectclass=*)", attrs, &res);
1203 if (!ADS_ERR_OK(status)) return status;
1204
1205 values = ldap_get_values(ads->ldap.ld, res, "supportedSASLMechanisms");
1206
1207 if (ads->auth.flags & ADS_AUTH_SASL_SEAL) {
1208 ads->ldap.wrap_type = ADS_SASLWRAP_TYPE_SEAL;
1209 } else if (ads->auth.flags & ADS_AUTH_SASL_SIGN) {
1210 ads->ldap.wrap_type = ADS_SASLWRAP_TYPE_SIGN;
1211 } else {
1212 ads->ldap.wrap_type = ADS_SASLWRAP_TYPE_PLAIN;
1213 }
1214
1215 /* try our supported mechanisms in order */
1216 for (i=0;sasl_mechanisms[i].name;i++) {
1217 /* see if the server supports it */
1218 for (j=0;values && values[j];j++) {
1219 if (strcmp(values[j], sasl_mechanisms[i].name) == 0) {
1220 DEBUG(4,("Found SASL mechanism %s\n", values[j]));
1221 retry:
1222 status = sasl_mechanisms[i].fn(ads);
1223 if (status.error_type == ENUM_ADS_ERROR_LDAP &&
1224 status.err.rc == LDAP_STRONG_AUTH_REQUIRED &&
1225 ads->ldap.wrap_type == ADS_SASLWRAP_TYPE_PLAIN)
1226 {
1227 DEBUG(3,("SASL bin got LDAP_STRONG_AUTH_REQUIRED "
1228 "retrying with signing enabled\n"));
1229 ads->ldap.wrap_type = ADS_SASLWRAP_TYPE_SIGN;
1230 goto retry;
1231 }
1232 ldap_value_free(values);
1233 ldap_msgfree(res);
1234 return status;
1235 }
1236 }
1237 }
1238
1239 ldap_value_free(values);
1240 ldap_msgfree(res);
1241 return ADS_ERROR(LDAP_AUTH_METHOD_NOT_SUPPORTED);
1242 }
1243
1244 #endif /* HAVE_LDAP */
1245
reg import