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Fix compilation without external heimdal.
[Samba.git] / source4 / rpc_server / backupkey / dcesrv_backupkey.c
blob2aee678bd4b46df6fdecb2fa2eb0d0a3c29b4fb5
1 /*
2 Unix SMB/CIFS implementation.
3
4 endpoint server for the backupkey interface
5
6 Copyright (C) Matthieu Patou <mat@samba.org> 2010
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "rpc_server/dcerpc_server.h"
24 #include "librpc/gen_ndr/ndr_backupkey.h"
25 #include "dsdb/common/util.h"
26 #include "dsdb/samdb/samdb.h"
27 #include "lib/ldb/include/ldb_errors.h"
28 #include "../lib/util/util_ldb.h"
29 #include "param/param.h"
30 #include "auth/session.h"
31 #include "system/network.h"
32 #include <com_err.h>
33 #include <hx509.h>
34 #include <hcrypto/rsa.h>
35 #include <hcrypto/bn.h>
36 #include <hcrypto/sha.h>
37 #include <der.h>
38 #include "../lib/tsocket/tsocket.h"
39 #include "../libcli/security/security.h"
40
41 #define BACKUPKEY_MIN_VERSION 2
42 #define BACKUPKEY_MAX_VERSION 3
43
44 static const unsigned rsa_with_var_num[] = { 1, 2, 840, 113549, 1, 1, 1 };
45 /* Equivalent to asn1_oid_id_pkcs1_rsaEncryption*/
46 static const AlgorithmIdentifier _hx509_signature_rsa_with_var_num = {
47 { 7, discard_const_p(unsigned, rsa_with_var_num) }, NULL
48 };
49
50 static NTSTATUS set_lsa_secret(TALLOC_CTX *mem_ctx,
51 struct ldb_context *ldb,
52 const char *name,
53 const DATA_BLOB *secret)
54 {
55 struct ldb_message *msg;
56 struct ldb_result *res;
57 struct ldb_dn *domain_dn;
58 struct ldb_dn *system_dn;
59 struct ldb_val val;
60 int ret;
61 char *name2;
62 struct timeval now = timeval_current();
63 NTTIME nt_now = timeval_to_nttime(&now);
64 const char *attrs[] = {
65 NULL
66 };
67
68 domain_dn = ldb_get_default_basedn(ldb);
69 if (!domain_dn) {
70 return NT_STATUS_INTERNAL_ERROR;
71 }
72
73 msg = ldb_msg_new(mem_ctx);
74 if (msg == NULL) {
75 return NT_STATUS_NO_MEMORY;
76 }
77
78 /*
79 * This function is a lot like dcesrv_lsa_CreateSecret
80 * in the rpc_server/lsa directory
81 * The reason why we duplicate the effort here is that:
82 * * we want to keep the former function static
83 * * we want to avoid the burden of doing LSA calls
84 * when we can just manipulate the secrets directly
85 * * taillor the function to the particular needs of backup protocol
86 */
87
88 system_dn = samdb_search_dn(ldb, msg, domain_dn, "(&(objectClass=container)(cn=System))");
89 if (system_dn == NULL) {
90 talloc_free(msg);
91 return NT_STATUS_NO_MEMORY;
92 }
93
94 name2 = talloc_asprintf(msg, "%s Secret", name);
95 if (name2 == NULL) {
96 talloc_free(msg);
97 return NT_STATUS_NO_MEMORY;
98 }
99
100 ret = ldb_search(ldb, mem_ctx, &res, system_dn, LDB_SCOPE_SUBTREE, attrs,
101 "(&(cn=%s)(objectclass=secret))",
102 ldb_binary_encode_string(mem_ctx, name2));
103
104 if (ret != LDB_SUCCESS || res->count != 0 ) {
105 DEBUG(2, ("Secret %s already exists !\n", name2));
106 talloc_free(msg);
107 return NT_STATUS_OBJECT_NAME_COLLISION;
108 }
109
110 /*
111 * We don't care about previous value as we are
112 * here only if the key didn't exists before
113 */
114
115 msg->dn = ldb_dn_copy(mem_ctx, system_dn);
116 if (msg->dn == NULL) {
117 talloc_free(msg);
118 return NT_STATUS_NO_MEMORY;
119 }
120 if (!ldb_dn_add_child_fmt(msg->dn, "cn=%s", name2)) {
121 talloc_free(msg);
122 return NT_STATUS_NO_MEMORY;
123 }
124
125 ret = ldb_msg_add_string(msg, "cn", name2);
126 if (ret != LDB_SUCCESS) {
127 talloc_free(msg);
128 return NT_STATUS_NO_MEMORY;
129 }
130 ret = ldb_msg_add_string(msg, "objectClass", "secret");
131 if (ret != LDB_SUCCESS) {
132 talloc_free(msg);
133 return NT_STATUS_NO_MEMORY;
134 }
135 ret = samdb_msg_add_uint64(ldb, mem_ctx, msg, "priorSetTime", nt_now);
136 if (ret != LDB_SUCCESS) {
137 talloc_free(msg);
138 return NT_STATUS_NO_MEMORY;
139 }
140 val.data = secret->data;
141 val.length = secret->length;
142 ret = ldb_msg_add_value(msg, "currentValue", &val, NULL);
143 if (ret != LDB_SUCCESS) {
144 talloc_free(msg);
145 return NT_STATUS_NO_MEMORY;
146 }
147 ret = samdb_msg_add_uint64(ldb, mem_ctx, msg, "lastSetTime", nt_now);
148 if (ret != LDB_SUCCESS) {
149 talloc_free(msg);
150 return NT_STATUS_NO_MEMORY;
151 }
152
153 /*
154 * create the secret with DSDB_MODIFY_RELAX
155 * otherwise dsdb/samdb/ldb_modules/objectclass.c forbid
156 * the create of LSA secret object
157 */
158 ret = dsdb_add(ldb, msg, DSDB_MODIFY_RELAX);
159 if (ret != LDB_SUCCESS) {
160 DEBUG(2,("Failed to create secret record %s: %s\n",
161 ldb_dn_get_linearized(msg->dn),
162 ldb_errstring(ldb)));
163 talloc_free(msg);
164 return NT_STATUS_ACCESS_DENIED;
165 }
166
167 talloc_free(msg);
168 return NT_STATUS_OK;
169 }
170
171 /* This function is pretty much like dcesrv_lsa_QuerySecret */
172 static NTSTATUS get_lsa_secret(TALLOC_CTX *mem_ctx,
173 struct ldb_context *ldb,
174 const char *name,
175 DATA_BLOB *secret)
176 {
177 TALLOC_CTX *tmp_mem;
178 struct ldb_result *res;
179 struct ldb_dn *domain_dn;
180 struct ldb_dn *system_dn;
181 const struct ldb_val *val;
182 uint8_t *data;
183 const char *attrs[] = {
184 "currentValue",
185 NULL
186 };
187 int ret;
188
189 secret->data = NULL;
190 secret->length = 0;
191
192 domain_dn = ldb_get_default_basedn(ldb);
193 if (!domain_dn) {
194 return NT_STATUS_INTERNAL_ERROR;
195 }
196
197 tmp_mem = talloc_new(mem_ctx);
198 if (tmp_mem == NULL) {
199 return NT_STATUS_NO_MEMORY;
200 }
201
202 system_dn = samdb_search_dn(ldb, tmp_mem, domain_dn, "(&(objectClass=container)(cn=System))");
203 if (system_dn == NULL) {
204 talloc_free(tmp_mem);
205 return NT_STATUS_NO_MEMORY;
206 }
207
208 ret = ldb_search(ldb, mem_ctx, &res, system_dn, LDB_SCOPE_SUBTREE, attrs,
209 "(&(cn=%s Secret)(objectclass=secret))",
210 ldb_binary_encode_string(tmp_mem, name));
211
212 if (ret != LDB_SUCCESS || res->count == 0) {
213 talloc_free(tmp_mem);
214 /*
215 * Important NOT to use NT_STATUS_OBJECT_NAME_NOT_FOUND
216 * as this return value is used to detect the case
217 * when we have the secret but without the currentValue
218 * (case RODC)
219 */
220 return NT_STATUS_RESOURCE_NAME_NOT_FOUND;
221 }
222
223 if (res->count > 1) {
224 DEBUG(2, ("Secret %s collision\n", name));
225 talloc_free(tmp_mem);
226 return NT_STATUS_INTERNAL_DB_CORRUPTION;
227 }
228
229 val = ldb_msg_find_ldb_val(res->msgs[0], "currentValue");
230 if (val == NULL) {
231 /*
232 * The secret object is here but we don't have the secret value
233 * The most common case is a RODC
234 */
235 talloc_free(tmp_mem);
236 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
237 }
238
239 data = val->data;
240 secret->data = talloc_move(mem_ctx, &data);
241 secret->length = val->length;
242
243 talloc_free(tmp_mem);
244 return NT_STATUS_OK;
245 }
246
247 static DATA_BLOB *reverse_and_get_blob(TALLOC_CTX *mem_ctx, BIGNUM *bn)
248 {
249 DATA_BLOB blob;
250 DATA_BLOB *rev = talloc(mem_ctx, DATA_BLOB);
251 uint32_t i;
252
253 blob.length = BN_num_bytes(bn);
254 blob.data = talloc_array(mem_ctx, uint8_t, blob.length);
255
256 if (blob.data == NULL) {
257 return NULL;
258 }
259
260 BN_bn2bin(bn, blob.data);
261
262 rev->data = talloc_array(mem_ctx, uint8_t, blob.length);
263 if (rev->data == NULL) {
264 return NULL;
265 }
266
267 for(i=0; i < blob.length; i++) {
268 rev->data[i] = blob.data[blob.length - i -1];
269 }
270 rev->length = blob.length;
271 talloc_free(blob.data);
272 return rev;
273 }
274
275 static BIGNUM *reverse_and_get_bignum(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
276 {
277 BIGNUM *ret;
278 DATA_BLOB rev;
279 uint32_t i;
280
281 rev.data = talloc_array(mem_ctx, uint8_t, blob->length);
282 if (rev.data == NULL) {
283 return NULL;
284 }
285
286 for(i=0; i < blob->length; i++) {
287 rev.data[i] = blob->data[blob->length - i -1];
288 }
289 rev.length = blob->length;
290
291 ret = BN_bin2bn(rev.data, rev.length, NULL);
292 talloc_free(rev.data);
293
294 return ret;
295 }
296
297 static NTSTATUS get_pk_from_raw_keypair_params(TALLOC_CTX *ctx,
298 struct bkrp_exported_RSA_key_pair *keypair,
299 hx509_private_key *pk)
300 {
301 hx509_context hctx;
302 RSA *rsa;
303 struct hx509_private_key_ops *ops;
304
305 hx509_context_init(&hctx);
306 ops = hx509_find_private_alg(&_hx509_signature_rsa_with_var_num.algorithm);
307 if (ops == NULL) {
308 DEBUG(2, ("Not supported algorithm\n"));
309 return NT_STATUS_INTERNAL_ERROR;
310 }
311
312 if (hx509_private_key_init(pk, ops, NULL) != 0) {
313 hx509_context_free(&hctx);
314 return NT_STATUS_NO_MEMORY;
315 }
316
317 rsa = RSA_new();
318 if (rsa ==NULL) {
319 hx509_context_free(&hctx);
320 return NT_STATUS_INVALID_PARAMETER;
321 }
322
323 rsa->n = reverse_and_get_bignum(ctx, &(keypair->modulus));
324 if (rsa->n == NULL) {
325 RSA_free(rsa);
326 hx509_context_free(&hctx);
327 return NT_STATUS_INVALID_PARAMETER;
328 }
329 rsa->d = reverse_and_get_bignum(ctx, &(keypair->private_exponent));
330 if (rsa->d == NULL) {
331 RSA_free(rsa);
332 hx509_context_free(&hctx);
333 return NT_STATUS_INVALID_PARAMETER;
334 }
335 rsa->p = reverse_and_get_bignum(ctx, &(keypair->prime1));
336 if (rsa->p == NULL) {
337 RSA_free(rsa);
338 hx509_context_free(&hctx);
339 return NT_STATUS_INVALID_PARAMETER;
340 }
341 rsa->q = reverse_and_get_bignum(ctx, &(keypair->prime2));
342 if (rsa->q == NULL) {
343 RSA_free(rsa);
344 hx509_context_free(&hctx);
345 return NT_STATUS_INVALID_PARAMETER;
346 }
347 rsa->dmp1 = reverse_and_get_bignum(ctx, &(keypair->exponent1));
348 if (rsa->dmp1 == NULL) {
349 RSA_free(rsa);
350 hx509_context_free(&hctx);
351 return NT_STATUS_INVALID_PARAMETER;
352 }
353 rsa->dmq1 = reverse_and_get_bignum(ctx, &(keypair->exponent2));
354 if (rsa->dmq1 == NULL) {
355 RSA_free(rsa);
356 hx509_context_free(&hctx);
357 return NT_STATUS_INVALID_PARAMETER;
358 }
359 rsa->iqmp = reverse_and_get_bignum(ctx, &(keypair->coefficient));
360 if (rsa->iqmp == NULL) {
361 RSA_free(rsa);
362 hx509_context_free(&hctx);
363 return NT_STATUS_INVALID_PARAMETER;
364 }
365 rsa->e = reverse_and_get_bignum(ctx, &(keypair->public_exponent));
366 if (rsa->e == NULL) {
367 RSA_free(rsa);
368 hx509_context_free(&hctx);
369 return NT_STATUS_INVALID_PARAMETER;
370 }
371
372 hx509_private_key_assign_rsa(*pk, rsa);
373
374 hx509_context_free(&hctx);
375 return NT_STATUS_OK;
376 }
377
378 static WERROR get_and_verify_access_check(TALLOC_CTX *sub_ctx,
379 uint32_t version,
380 uint8_t *key_and_iv,
381 uint8_t *access_check,
382 uint32_t access_check_len,
383 struct dom_sid **access_sid)
384 {
385 heim_octet_string iv;
386 heim_octet_string access_check_os;
387 hx509_crypto crypto;
388
389 DATA_BLOB blob_us;
390 uint32_t key_len;
391 uint32_t iv_len;
392 int res;
393 enum ndr_err_code ndr_err;
394 hx509_context hctx;
395
396 /* This one should not be freed */
397 const AlgorithmIdentifier *alg;
398
399 *access_sid = NULL;
400 switch (version) {
401 case 2:
402 key_len = 24;
403 iv_len = 8;
404 alg = hx509_crypto_des_rsdi_ede3_cbc();
405 break;
406
407 case 3:
408 key_len = 32;
409 iv_len = 16;
410 alg =hx509_crypto_aes256_cbc();
411 break;
412
413 default:
414 return WERR_INVALID_DATA;
415 }
416
417 hx509_context_init(&hctx);
418 res = hx509_crypto_init(hctx, NULL,
419 &(alg->algorithm),
420 &crypto);
421 hx509_context_free(&hctx);
422
423 if (res != 0) {
424 return WERR_INVALID_DATA;
425 }
426
427 res = hx509_crypto_set_key_data(crypto, key_and_iv, key_len);
428
429 iv.data = talloc_memdup(sub_ctx, key_len + key_and_iv, iv_len);
430 iv.length = iv_len;
431
432 if (res != 0) {
433 hx509_crypto_destroy(crypto);
434 return WERR_INVALID_DATA;
435 }
436
437 hx509_crypto_set_padding(crypto, HX509_CRYPTO_PADDING_NONE);
438 res = hx509_crypto_decrypt(crypto,
439 access_check,
440 access_check_len,
441 &iv,
442 &access_check_os);
443
444 if (res != 0) {
445 hx509_crypto_destroy(crypto);
446 return WERR_INVALID_DATA;
447 }
448
449 blob_us.data = access_check_os.data;
450 blob_us.length = access_check_os.length;
451
452 hx509_crypto_destroy(crypto);
453
454 if (version == 2) {
455 uint32_t hash_size = 20;
456 uint8_t hash[hash_size];
457 struct sha sctx;
458 struct bkrp_access_check_v2 uncrypted_accesscheckv2;
459
460 ndr_err = ndr_pull_struct_blob(&blob_us, sub_ctx, &uncrypted_accesscheckv2,
461 (ndr_pull_flags_fn_t)ndr_pull_bkrp_access_check_v2);
462 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
463 /* Unable to unmarshall */
464 der_free_octet_string(&access_check_os);
465 return WERR_INVALID_DATA;
466 }
467 if (uncrypted_accesscheckv2.magic != 0x1) {
468 /* wrong magic */
469 der_free_octet_string(&access_check_os);
470 return WERR_INVALID_DATA;
471 }
472
473 SHA1_Init(&sctx);
474 SHA1_Update(&sctx, blob_us.data, blob_us.length - hash_size);
475 SHA1_Final(hash, &sctx);
476 der_free_octet_string(&access_check_os);
477 /*
478 * We free it after the sha1 calculation because blob.data
479 * point to the same area
480 */
481
482 if (memcmp(hash, uncrypted_accesscheckv2.hash, hash_size) != 0) {
483 DEBUG(2, ("Wrong hash value in the access check in backup key remote protocol\n"));
484 return WERR_INVALID_DATA;
485 }
486 *access_sid = dom_sid_dup(sub_ctx, &(uncrypted_accesscheckv2.sid));
487 if (*access_sid == NULL) {
488 return WERR_NOMEM;
489 }
490 return WERR_OK;
491 }
492
493 if (version == 3) {
494 uint32_t hash_size = 64;
495 uint8_t hash[hash_size];
496 struct hc_sha512state sctx;
497 struct bkrp_access_check_v3 uncrypted_accesscheckv3;
498
499 ndr_err = ndr_pull_struct_blob(&blob_us, sub_ctx, &uncrypted_accesscheckv3,
500 (ndr_pull_flags_fn_t)ndr_pull_bkrp_access_check_v3);
501 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
502 /* Unable to unmarshall */
503 der_free_octet_string(&access_check_os);
504 return WERR_INVALID_DATA;
505 }
506 if (uncrypted_accesscheckv3.magic != 0x1) {
507 /* wrong magic */
508 der_free_octet_string(&access_check_os);
509 return WERR_INVALID_DATA;
510 }
511
512 SHA512_Init(&sctx);
513 SHA512_Update(&sctx, blob_us.data, blob_us.length - hash_size);
514 SHA512_Final(hash, &sctx);
515 der_free_octet_string(&access_check_os);
516 /*
517 * We free it after the sha1 calculation because blob.data
518 * point to the same area
519 */
520
521 if (memcmp(hash, uncrypted_accesscheckv3.hash, hash_size) != 0) {
522 DEBUG(2, ("Wrong hash value in the access check in backup key remote protocol\n"));
523 return WERR_INVALID_DATA;
524 }
525 *access_sid = dom_sid_dup(sub_ctx, &(uncrypted_accesscheckv3.sid));
526 if (*access_sid == NULL) {
527 return WERR_NOMEM;
528 }
529 return WERR_OK;
530 }
531
532 /* Never reached normally as we filtered at the switch / case level */
533 return WERR_INVALID_DATA;
534 }
535
536 static WERROR bkrp_do_uncrypt_client_wrap_key(struct dcesrv_call_state *dce_call,
537 TALLOC_CTX *mem_ctx,
538 struct bkrp_BackupKey *r,
539 struct ldb_context *ldb_ctx)
540 {
541 struct bkrp_client_side_wrapped uncrypt_request;
542 DATA_BLOB blob;
543 enum ndr_err_code ndr_err;
544 char *guid_string;
545 char *cert_secret_name;
546 DATA_BLOB secret;
547 DATA_BLOB *uncrypted;
548 NTSTATUS status;
549
550 blob.data = r->in.data_in;
551 blob.length = r->in.data_in_len;
552
553 if (r->in.data_in_len == 0 || r->in.data_in == NULL) {
554 return WERR_INVALID_PARAM;
555 }
556
557 ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &uncrypt_request,
558 (ndr_pull_flags_fn_t)ndr_pull_bkrp_client_side_wrapped);
559 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
560 return WERR_INVALID_PARAM;
561 }
562
563 if (uncrypt_request.version < BACKUPKEY_MIN_VERSION) {
564 return WERR_INVALID_PARAMETER;
565 }
566
567 if (uncrypt_request.version > BACKUPKEY_MAX_VERSION) {
568 return WERR_INVALID_PARAMETER;
569 }
570
571 guid_string = GUID_string(mem_ctx, &uncrypt_request.guid);
572 if (guid_string == NULL) {
573 return WERR_NOMEM;
574 }
575
576 cert_secret_name = talloc_asprintf(mem_ctx,
577 "BCKUPKEY_%s",
578 guid_string);
579 if (cert_secret_name == NULL) {
580 return WERR_NOMEM;
581 }
582
583 status = get_lsa_secret(mem_ctx,
584 ldb_ctx,
585 cert_secret_name,
586 &secret);
587 if (!NT_STATUS_IS_OK(status)) {
588 DEBUG(10, ("Error while fetching secret %s\n", cert_secret_name));
589 if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
590 /* we do not have the real secret attribute */
591 return WERR_INVALID_PARAMETER;
592 } else {
593 return WERR_FILE_NOT_FOUND;
594 }
595 }
596
597 if (secret.length != 0) {
598 hx509_context hctx;
599 struct bkrp_exported_RSA_key_pair keypair;
600 hx509_private_key pk;
601 uint32_t i, res;
602 struct dom_sid *access_sid = NULL;
603 heim_octet_string reversed_secret;
604 heim_octet_string uncrypted_secret;
605 AlgorithmIdentifier alg;
606 struct dom_sid *caller_sid;
607 DATA_BLOB blob_us;
608 WERROR werr;
609
610 ndr_err = ndr_pull_struct_blob(&secret, mem_ctx, &keypair, (ndr_pull_flags_fn_t)ndr_pull_bkrp_exported_RSA_key_pair);
611 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
612 DEBUG(2, ("Unable to parse the ndr encoded cert in key %s\n", cert_secret_name));
613 return WERR_FILE_NOT_FOUND;
614 }
615
616 status = get_pk_from_raw_keypair_params(mem_ctx, &keypair, &pk);
617 if (!NT_STATUS_IS_OK(status)) {
618 return WERR_INTERNAL_ERROR;
619 }
620
621 reversed_secret.data = talloc_array(mem_ctx, uint8_t,
622 uncrypt_request.encrypted_secret_len);
623 if (reversed_secret.data == NULL) {
624 hx509_private_key_free(&pk);
625 return WERR_NOMEM;
626 }
627
628 /* The secret has to be reversed ... */
629 for(i=0; i< uncrypt_request.encrypted_secret_len; i++) {
630 uint8_t *reversed = (uint8_t *)reversed_secret.data;
631 uint8_t *uncrypt = uncrypt_request.encrypted_secret;
632 reversed[i] = uncrypt[uncrypt_request.encrypted_secret_len - 1 - i];
633 }
634 reversed_secret.length = uncrypt_request.encrypted_secret_len;
635
636 /*
637 * Let's try to decrypt the secret now that
638 * we have the private key ...
639 */
640 hx509_context_init(&hctx);
641 res = hx509_private_key_private_decrypt(hctx, &reversed_secret,
642 &alg.algorithm, pk,
643 &uncrypted_secret);
644 hx509_context_free(&hctx);
645 hx509_private_key_free(&pk);
646 if (res != 0) {
647 /* We are not able to decrypt the secret, looks like something is wrong */
648 return WERR_INVALID_DATA;
649 }
650 blob_us.data = uncrypted_secret.data;
651 blob_us.length = uncrypted_secret.length;
652
653 if (uncrypt_request.version == 2) {
654 struct bkrp_encrypted_secret_v2 uncrypted_secretv2;
655
656 ndr_err = ndr_pull_struct_blob(&blob_us, mem_ctx, &uncrypted_secretv2,
657 (ndr_pull_flags_fn_t)ndr_pull_bkrp_encrypted_secret_v2);
658 der_free_octet_string(&uncrypted_secret);
659 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
660 /* Unable to unmarshall */
661 return WERR_INVALID_DATA;
662 }
663 if (uncrypted_secretv2.magic != 0x20) {
664 /* wrong magic */
665 return WERR_INVALID_DATA;
666 }
667
668 werr = get_and_verify_access_check(mem_ctx, 2,
669 uncrypted_secretv2.payload_key,
670 uncrypt_request.access_check,
671 uncrypt_request.access_check_len,
672 &access_sid);
673 if (!W_ERROR_IS_OK(werr)) {
674 return werr;
675 }
676 uncrypted = talloc(mem_ctx, DATA_BLOB);
677 if (uncrypted == NULL) {
678 return WERR_INVALID_DATA;
679 }
680
681 uncrypted->data = uncrypted_secretv2.secret;
682 uncrypted->length = uncrypted_secretv2.secret_len;
683 }
684 if (uncrypt_request.version == 3) {
685 struct bkrp_encrypted_secret_v3 uncrypted_secretv3;
686
687 ndr_err = ndr_pull_struct_blob(&blob_us, mem_ctx, &uncrypted_secretv3,
688 (ndr_pull_flags_fn_t)ndr_pull_bkrp_encrypted_secret_v3);
689
690 der_free_octet_string(&uncrypted_secret);
691 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
692 /* Unable to unmarshall */
693 return WERR_INVALID_DATA;
694 }
695
696 if (uncrypted_secretv3.magic1 != 0x30 ||
697 uncrypted_secretv3.magic2 != 0x6610 ||
698 uncrypted_secretv3.magic3 != 0x800e) {
699 /* wrong magic */
700 return WERR_INVALID_DATA;
701 }
702
703 werr = get_and_verify_access_check(mem_ctx, 3,
704 uncrypted_secretv3.payload_key,
705 uncrypt_request.access_check,
706 uncrypt_request.access_check_len,
707 &access_sid);
708 if (!W_ERROR_IS_OK(werr)) {
709 return werr;
710 }
711
712 uncrypted = talloc(mem_ctx, DATA_BLOB);
713 if (uncrypted == NULL) {
714 return WERR_INVALID_DATA;
715 }
716
717 uncrypted->data = uncrypted_secretv3.secret;
718 uncrypted->length = uncrypted_secretv3.secret_len;
719 }
720
721 caller_sid = &dce_call->conn->auth_state.session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
722
723 if (!dom_sid_equal(caller_sid, access_sid)) {
724 talloc_free(uncrypted);
725 return WERR_INVALID_ACCESS;
726 }
727
728 /*
729 * Yeah if we are here all looks pretty good:
730 * - hash is ok
731 * - user sid is the same as the one in access check
732 * - we were able to decrypt the whole stuff
733 */
734 }
735
736 if (uncrypted->data == NULL) {
737 return WERR_INVALID_DATA;
738 }
739
740 /* There is a magic value a the beginning of the data
741 * we can use an adhoc structure but as the
742 * parent structure is just an array of bytes it a lot of work
743 * work just prepending 4 bytes
744 */
745 *(r->out.data_out) = talloc_zero_array(mem_ctx, uint8_t, uncrypted->length + 4);
746 W_ERROR_HAVE_NO_MEMORY(*(r->out.data_out));
747 memcpy(4+*(r->out.data_out), uncrypted->data, uncrypted->length);
748 *(r->out.data_out_len) = uncrypted->length + 4;
749
750 return WERR_OK;
751 }
752
753 static WERROR create_heimdal_rsa_key(TALLOC_CTX *ctx, hx509_context *hctx,
754 hx509_private_key *pk, RSA **_rsa)
755 {
756 BIGNUM *pub_expo;
757 RSA *rsa;
758 int ret;
759 uint8_t *p0, *p;
760 size_t len;
761 int bits = 2048;
762
763 *_rsa = NULL;
764
765 pub_expo = BN_new();
766 if(pub_expo == NULL) {
767 return WERR_INTERNAL_ERROR;
768 }
769
770 /* set the public expo to 65537 like everyone */
771 BN_set_word(pub_expo, 0x10001);
772
773 rsa = RSA_new();
774 if(rsa == NULL) {
775 BN_free(pub_expo);
776 return WERR_INTERNAL_ERROR;
777 }
778
779 ret = RSA_generate_key_ex(rsa, bits, pub_expo, NULL);
780 if(ret != 1) {
781 RSA_free(rsa);
782 BN_free(pub_expo);
783 return WERR_INTERNAL_ERROR;
784 }
785 BN_free(pub_expo);
786
787 len = i2d_RSAPrivateKey(rsa, NULL);
788 if (len < 1) {
789 RSA_free(rsa);
790 return WERR_INTERNAL_ERROR;
791 }
792
793 p0 = p = talloc_array(ctx, uint8_t, len);
794 if (p == NULL) {
795 RSA_free(rsa);
796 return WERR_INTERNAL_ERROR;
797 }
798
799 len = i2d_RSAPrivateKey(rsa, &p);
800 if (len < 1) {
801 RSA_free(rsa);
802 talloc_free(p0);
803 return WERR_INTERNAL_ERROR;
804 }
805
806 /*
807 * To dump the key we can use :
808 * rk_dumpdata("h5lkey", p0, len);
809 */
810 ret = hx509_parse_private_key(*hctx, &_hx509_signature_rsa_with_var_num ,
811 p0, len, HX509_KEY_FORMAT_DER, pk);
812 memset(p0, 0, len);
813 talloc_free(p0);
814 if (ret !=0) {
815 RSA_free(rsa);
816 return WERR_INTERNAL_ERROR;
817 }
818
819 *_rsa = rsa;
820 return WERR_OK;
821 }
822
823 static WERROR self_sign_cert(TALLOC_CTX *ctx, hx509_context *hctx, hx509_request *req,
824 time_t lifetime, hx509_private_key *private_key,
825 hx509_cert *cert, DATA_BLOB *guidblob)
826 {
827 SubjectPublicKeyInfo spki;
828 hx509_name subject = NULL;
829 hx509_ca_tbs tbs;
830 struct heim_bit_string uniqueid;
831 int ret;
832
833 uniqueid.data = talloc_memdup(ctx, guidblob->data, guidblob->length);
834 /* uniqueid is a bit string in which each byte represent 1 bit (1 or 0)
835 * so as 1 byte is 8 bits we need to provision 8 times more space as in the
836 * blob
837 */
838 uniqueid.length = 8 * guidblob->length;
839
840 memset(&spki, 0, sizeof(spki));
841
842 ret = hx509_request_get_name(*hctx, *req, &subject);
843 if (ret !=0) {
844 talloc_free(uniqueid.data);
845 return WERR_INTERNAL_ERROR;
846 }
847 ret = hx509_request_get_SubjectPublicKeyInfo(*hctx, *req, &spki);
848 if (ret !=0) {
849 talloc_free(uniqueid.data);
850 hx509_name_free(&subject);
851 return WERR_INTERNAL_ERROR;
852 }
853
854 ret = hx509_ca_tbs_init(*hctx, &tbs);
855 if (ret !=0) {
856 talloc_free(uniqueid.data);
857 hx509_name_free(&subject);
858 free_SubjectPublicKeyInfo(&spki);
859 return WERR_INTERNAL_ERROR;
860 }
861
862 ret = hx509_ca_tbs_set_spki(*hctx, tbs, &spki);
863 if (ret !=0) {
864 talloc_free(uniqueid.data);
865 hx509_name_free(&subject);
866 free_SubjectPublicKeyInfo(&spki);
867 return WERR_INTERNAL_ERROR;
868 }
869 ret = hx509_ca_tbs_set_subject(*hctx, tbs, subject);
870 if (ret !=0) {
871 talloc_free(uniqueid.data);
872 hx509_name_free(&subject);
873 free_SubjectPublicKeyInfo(&spki);
874 hx509_ca_tbs_free(&tbs);
875 return WERR_INTERNAL_ERROR;
876 }
877 ret = hx509_ca_tbs_set_ca(*hctx, tbs, 1);
878 if (ret !=0) {
879 talloc_free(uniqueid.data);
880 hx509_name_free(&subject);
881 free_SubjectPublicKeyInfo(&spki);
882 hx509_ca_tbs_free(&tbs);
883 return WERR_INTERNAL_ERROR;
884 }
885 ret = hx509_ca_tbs_set_notAfter_lifetime(*hctx, tbs, lifetime);
886 if (ret !=0) {
887 talloc_free(uniqueid.data);
888 hx509_name_free(&subject);
889 free_SubjectPublicKeyInfo(&spki);
890 hx509_ca_tbs_free(&tbs);
891 return WERR_INTERNAL_ERROR;
892 }
893 ret = hx509_ca_tbs_set_unique(*hctx, tbs, &uniqueid, &uniqueid);
894 if (ret !=0) {
895 talloc_free(uniqueid.data);
896 hx509_name_free(&subject);
897 free_SubjectPublicKeyInfo(&spki);
898 hx509_ca_tbs_free(&tbs);
899 return WERR_INTERNAL_ERROR;
900 }
901 ret = hx509_ca_sign_self(*hctx, tbs, *private_key, cert);
902 if (ret !=0) {
903 talloc_free(uniqueid.data);
904 hx509_name_free(&subject);
905 free_SubjectPublicKeyInfo(&spki);
906 hx509_ca_tbs_free(&tbs);
907 return WERR_INTERNAL_ERROR;
908 }
909 hx509_name_free(&subject);
910 free_SubjectPublicKeyInfo(&spki);
911 hx509_ca_tbs_free(&tbs);
912
913 return WERR_OK;
914 }
915
916 static WERROR create_req(TALLOC_CTX *ctx, hx509_context *hctx, hx509_request *req,
917 hx509_private_key *signer,RSA **rsa, const char *dn)
918 {
919 int ret;
920 SubjectPublicKeyInfo key;
921
922 hx509_name name;
923 WERROR w_err;
924
925 w_err = create_heimdal_rsa_key(ctx, hctx, signer, rsa);
926 if (!W_ERROR_IS_OK(w_err)) {
927 return w_err;
928 }
929
930 hx509_request_init(*hctx, req);
931 ret = hx509_parse_name(*hctx, dn, &name);
932 if (ret != 0) {
933 RSA_free(*rsa);
934 hx509_private_key_free(signer);
935 hx509_request_free(req);
936 hx509_name_free(&name);
937 return WERR_INTERNAL_ERROR;
938 }
939
940 ret = hx509_request_set_name(*hctx, *req, name);
941 if (ret != 0) {
942 RSA_free(*rsa);
943 hx509_private_key_free(signer);
944 hx509_request_free(req);
945 hx509_name_free(&name);
946 return WERR_INTERNAL_ERROR;
947 }
948 hx509_name_free(&name);
949
950 ret = hx509_private_key2SPKI(*hctx, *signer, &key);
951 if (ret != 0) {
952 RSA_free(*rsa);
953 hx509_private_key_free(signer);
954 hx509_request_free(req);
955 return WERR_INTERNAL_ERROR;
956 }
957 ret = hx509_request_set_SubjectPublicKeyInfo(*hctx, *req, &key);
958 if (ret != 0) {
959 RSA_free(*rsa);
960 hx509_private_key_free(signer);
961 free_SubjectPublicKeyInfo(&key);
962 hx509_request_free(req);
963 return WERR_INTERNAL_ERROR;
964 }
965
966 free_SubjectPublicKeyInfo(&key);
967
968 return WERR_OK;
969 }
970
971 /* Return an error when we fail to generate a certificate */
972 static WERROR generate_bkrp_cert(TALLOC_CTX *ctx, struct dcesrv_call_state *dce_call, struct ldb_context *ldb_ctx, const char *dn)
973 {
974
975 struct heim_octet_string data;
976 WERROR w_err;
977 RSA *rsa;
978 hx509_context hctx;
979 hx509_private_key pk;
980 hx509_request req;
981 hx509_cert cert;
982 DATA_BLOB blob;
983 DATA_BLOB blobkeypair;
984 DATA_BLOB *tmp;
985 int ret;
986 bool ok = true;
987 struct GUID guid = GUID_random();
988 NTSTATUS status;
989 char *secret_name;
990 struct bkrp_exported_RSA_key_pair keypair;
991 enum ndr_err_code ndr_err;
992 uint32_t nb_days_validity = 365;
993
994 DEBUG(6, ("Trying to generate a certificate\n"));
995 hx509_context_init(&hctx);
996 w_err = create_req(ctx, &hctx, &req, &pk, &rsa, dn);
997 if (!W_ERROR_IS_OK(w_err)) {
998 hx509_context_free(&hctx);
999 return w_err;
1000 }
1001
1002 status = GUID_to_ndr_blob(&guid, ctx, &blob);
1003 if (!NT_STATUS_IS_OK(status)) {
1004 hx509_context_free(&hctx);
1005 hx509_private_key_free(&pk);
1006 RSA_free(rsa);
1007 return WERR_INVALID_DATA;
1008 }
1009
1010 w_err = self_sign_cert(ctx, &hctx, &req, nb_days_validity, &pk, &cert, &blob);
1011 if (!W_ERROR_IS_OK(w_err)) {
1012 hx509_private_key_free(&pk);
1013 hx509_context_free(&hctx);
1014 return WERR_INVALID_DATA;
1015 }
1016
1017 ret = hx509_cert_binary(hctx, cert, &data);
1018 if (ret !=0) {
1019 hx509_cert_free(cert);
1020 hx509_private_key_free(&pk);
1021 hx509_context_free(&hctx);
1022 return WERR_INVALID_DATA;
1023 }
1024
1025 keypair.cert.data = talloc_memdup(ctx, data.data, data.length);
1026 keypair.cert.length = data.length;
1027
1028 /*
1029 * Heimdal's bignum are big endian and the
1030 * structure expect it to be in little endian
1031 * so we reverse the buffer to make it work
1032 */
1033 tmp = reverse_and_get_blob(ctx, rsa->e);
1034 if (tmp == NULL) {
1035 ok = false;
1036 } else {
1037 keypair.public_exponent = *tmp;
1038 SMB_ASSERT(tmp->length <= 4);
1039 /*
1040 * The value is now in little endian but if can happen that the length is
1041 * less than 4 bytes.
1042 * So if we have less than 4 bytes we pad with zeros so that it correctly
1043 * fit into the structure.
1044 */
1045 if (tmp->length < 4) {
1046 /*
1047 * We need the expo to fit 4 bytes
1048 */
1049 keypair.public_exponent.data = talloc_zero_array(ctx, uint8_t, 4);
1050 memcpy(keypair.public_exponent.data, tmp->data, tmp->length);
1051 keypair.public_exponent.length = 4;
1052 }
1053 }
1054
1055 tmp = reverse_and_get_blob(ctx,rsa->d);
1056 if (tmp == NULL) {
1057 ok = false;
1058 } else {
1059 keypair.private_exponent = *tmp;
1060 }
1061
1062 tmp = reverse_and_get_blob(ctx,rsa->n);
1063 if (tmp == NULL) {
1064 ok = false;
1065 } else {
1066 keypair.modulus = *tmp;
1067 }
1068
1069 tmp = reverse_and_get_blob(ctx,rsa->p);
1070 if (tmp == NULL) {
1071 ok = false;
1072 } else {
1073 keypair.prime1 = *tmp;
1074 }
1075
1076 tmp = reverse_and_get_blob(ctx,rsa->q);
1077 if (tmp == NULL) {
1078 ok = false;
1079 } else {
1080 keypair.prime2 = *tmp;
1081 }
1082
1083 tmp = reverse_and_get_blob(ctx,rsa->dmp1);
1084 if (tmp == NULL) {
1085 ok = false;
1086 } else {
1087 keypair.exponent1 = *tmp;
1088 }
1089
1090 tmp = reverse_and_get_blob(ctx,rsa->dmq1);
1091 if (tmp == NULL) {
1092 ok = false;
1093 } else {
1094 keypair.exponent2 = *tmp;
1095 }
1096
1097 tmp = reverse_and_get_blob(ctx,rsa->iqmp);
1098 if (tmp == NULL) {
1099 ok = false;
1100 } else {
1101 keypair.coefficient = *tmp;
1102 }
1103
1104 /* One of the keypair allocation was wrong */
1105 if (ok == false) {
1106 der_free_octet_string(&data);
1107 hx509_cert_free(cert);
1108 hx509_private_key_free(&pk);
1109 hx509_context_free(&hctx);
1110 RSA_free(rsa);
1111 return WERR_INVALID_DATA;
1112 }
1113 keypair.certificate_len = keypair.cert.length;
1114 ndr_err = ndr_push_struct_blob(&blobkeypair, ctx, &keypair, (ndr_push_flags_fn_t)ndr_push_bkrp_exported_RSA_key_pair);
1115 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1116 der_free_octet_string(&data);
1117 hx509_cert_free(cert);
1118 hx509_private_key_free(&pk);
1119 hx509_context_free(&hctx);
1120 RSA_free(rsa);
1121 return WERR_INVALID_DATA;
1122 }
1123
1124 secret_name = talloc_asprintf(ctx, "BCKUPKEY_%s", GUID_string(ctx, &guid));
1125 if (secret_name == NULL) {
1126 der_free_octet_string(&data);
1127 hx509_cert_free(cert);
1128 hx509_private_key_free(&pk);
1129 hx509_context_free(&hctx);
1130 RSA_free(rsa);
1131 return WERR_OUTOFMEMORY;
1132 }
1133
1134 status = set_lsa_secret(ctx, ldb_ctx, secret_name, &blobkeypair);
1135 if (!NT_STATUS_IS_OK(status)) {
1136 DEBUG(2, ("Failed to save the secret %s\n", secret_name));
1137 }
1138 talloc_free(secret_name);
1139
1140 GUID_to_ndr_blob(&guid, ctx, &blob);
1141 status = set_lsa_secret(ctx, ldb_ctx, "BCKUPKEY_PREFERRED", &blob);
1142 if (!NT_STATUS_IS_OK(status)) {
1143 DEBUG(2, ("Failed to save the secret BCKUPKEY_PREFERRED\n"));
1144 }
1145
1146 der_free_octet_string(&data);
1147 hx509_cert_free(cert);
1148 hx509_private_key_free(&pk);
1149 hx509_context_free(&hctx);
1150 RSA_free(rsa);
1151 return WERR_OK;
1152 }
1153
1154 static WERROR bkrp_do_retreive_client_wrap_key(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
1155 struct bkrp_BackupKey *r ,struct ldb_context *ldb_ctx)
1156 {
1157 struct GUID guid;
1158 char *guid_string;
1159 DATA_BLOB secret;
1160 enum ndr_err_code ndr_err;
1161 NTSTATUS status;
1162
1163 /*
1164 * here we basicaly need to return our certificate
1165 * search for lsa secret BCKUPKEY_PREFERRED first
1166 */
1167
1168 status = get_lsa_secret(mem_ctx,
1169 ldb_ctx,
1170 "BCKUPKEY_PREFERRED",
1171 &secret);
1172 if (!NT_STATUS_IS_OK(status)) {
1173 DEBUG(10, ("Error while fetching secret BCKUPKEY_PREFERRED\n"));
1174 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
1175 /* Ok we can be in this case if there was no certs */
1176 struct loadparm_context *lp_ctx = dce_call->conn->dce_ctx->lp_ctx;
1177 char *dn = talloc_asprintf(mem_ctx, "CN=%s.%s",
1178 lpcfg_netbios_name(lp_ctx),
1179 lpcfg_realm(lp_ctx));
1180
1181 WERROR werr = generate_bkrp_cert(mem_ctx, dce_call, ldb_ctx, dn);
1182 if (!W_ERROR_IS_OK(werr)) {
1183 return WERR_INVALID_PARAMETER;
1184 }
1185 status = get_lsa_secret(mem_ctx,
1186 ldb_ctx,
1187 "BCKUPKEY_PREFERRED",
1188 &secret);
1189
1190 if (!NT_STATUS_IS_OK(status)) {
1191 /* Ok we really don't manage to get this certs ...*/
1192 DEBUG(2, ("Unable to locate BCKUPKEY_PREFERRED after cert generation\n"));
1193 return WERR_FILE_NOT_FOUND;
1194 }
1195 } else {
1196 /* In theory we should NEVER reach this point as it
1197 should only appear in a rodc server */
1198 /* we do not have the real secret attribute */
1199 return WERR_INVALID_PARAMETER;
1200 }
1201 }
1202
1203 if (secret.length != 0) {
1204 char *cert_secret_name;
1205
1206 status = GUID_from_ndr_blob(&secret, &guid);
1207 if (!NT_STATUS_IS_OK(status)) {
1208 return WERR_FILE_NOT_FOUND;
1209 }
1210
1211 guid_string = GUID_string(mem_ctx, &guid);
1212 if (guid_string == NULL) {
1213 /* We return file not found because the client
1214 * expect this error
1215 */
1216 return WERR_FILE_NOT_FOUND;
1217 }
1218
1219 cert_secret_name = talloc_asprintf(mem_ctx,
1220 "BCKUPKEY_%s",
1221 guid_string);
1222 status = get_lsa_secret(mem_ctx,
1223 ldb_ctx,
1224 cert_secret_name,
1225 &secret);
1226 if (!NT_STATUS_IS_OK(status)) {
1227 return WERR_FILE_NOT_FOUND;
1228 }
1229
1230 if (secret.length != 0) {
1231 struct bkrp_exported_RSA_key_pair keypair;
1232 ndr_err = ndr_pull_struct_blob(&secret, mem_ctx, &keypair,
1233 (ndr_pull_flags_fn_t)ndr_pull_bkrp_exported_RSA_key_pair);
1234 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
1235 return WERR_FILE_NOT_FOUND;
1236 }
1237 *(r->out.data_out_len) = keypair.cert.length;
1238 *(r->out.data_out) = talloc_memdup(mem_ctx, keypair.cert.data, keypair.cert.length);
1239 W_ERROR_HAVE_NO_MEMORY(*(r->out.data_out));
1240 return WERR_OK;
1241 } else {
1242 DEBUG(10, ("No or broken secret called %s\n", cert_secret_name));
1243 return WERR_FILE_NOT_FOUND;
1244 }
1245 } else {
1246 DEBUG(10, ("No secret BCKUPKEY_PREFERRED\n"));
1247 return WERR_FILE_NOT_FOUND;
1248 }
1249
1250 return WERR_NOT_SUPPORTED;
1251 }
1252
1253 static WERROR dcesrv_bkrp_BackupKey(struct dcesrv_call_state *dce_call,
1254 TALLOC_CTX *mem_ctx, struct bkrp_BackupKey *r)
1255 {
1256 WERROR error = WERR_INVALID_PARAM;
1257 struct ldb_context *ldb_ctx;
1258 bool is_rodc;
1259 const char *addr = "unknown";
1260 /* At which level we start to add more debug of what is done in the protocol */
1261 const int debuglevel = 4;
1262
1263 if (DEBUGLVL(debuglevel)) {
1264 const struct tsocket_address *remote_address;
1265 remote_address = dcesrv_connection_get_remote_address(dce_call->conn);
1266 if (tsocket_address_is_inet(remote_address, "ip")) {
1267 addr = tsocket_address_inet_addr_string(remote_address, mem_ctx);
1268 W_ERROR_HAVE_NO_MEMORY(addr);
1269 }
1270 }
1271
1272 if (lpcfg_server_role(dce_call->conn->dce_ctx->lp_ctx) != ROLE_DOMAIN_CONTROLLER) {
1273 return WERR_NOT_SUPPORTED;
1274 }
1275
1276 if (!dce_call->conn->auth_state.auth_info ||
1277 dce_call->conn->auth_state.auth_info->auth_level != DCERPC_AUTH_LEVEL_PRIVACY) {
1278 DCESRV_FAULT(DCERPC_FAULT_ACCESS_DENIED);
1279 }
1280
1281 ldb_ctx = samdb_connect(mem_ctx, dce_call->event_ctx,
1282 dce_call->conn->dce_ctx->lp_ctx,
1283 system_session(dce_call->conn->dce_ctx->lp_ctx), 0);
1284
1285 if (samdb_rodc(ldb_ctx, &is_rodc) != LDB_SUCCESS) {
1286 talloc_unlink(mem_ctx, ldb_ctx);
1287 return WERR_INVALID_PARAM;
1288 }
1289
1290 if (!is_rodc) {
1291 if(strncasecmp(GUID_string(mem_ctx, r->in.guidActionAgent),
1292 BACKUPKEY_RESTORE_GUID, strlen(BACKUPKEY_RESTORE_GUID)) == 0) {
1293 DEBUG(debuglevel, ("Client %s requested to decrypt a client side wrapped secret\n", addr));
1294 error = bkrp_do_uncrypt_client_wrap_key(dce_call, mem_ctx, r, ldb_ctx);
1295 }
1296
1297 if (strncasecmp(GUID_string(mem_ctx, r->in.guidActionAgent),
1298 BACKUPKEY_RETRIEVE_BACKUP_KEY_GUID, strlen(BACKUPKEY_RETRIEVE_BACKUP_KEY_GUID)) == 0) {
1299 DEBUG(debuglevel, ("Client %s requested certificate for client wrapped secret\n", addr));
1300 error = bkrp_do_retreive_client_wrap_key(dce_call, mem_ctx, r, ldb_ctx);
1301 }
1302 }
1303 /*else: I am a RODC so I don't handle backup key protocol */
1304
1305 talloc_unlink(mem_ctx, ldb_ctx);
1306 return error;
1307 }
1308
1309 /* include the generated boilerplate */
1310 #include "librpc/gen_ndr/ndr_backupkey_s.c"
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