s4: Add server side implementation of backup key remote protocol

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

2 files changed, 1315 insertions, 0 deletions

diff --git a/source4/rpc_server/backupkey/dcesrv_backupkey.c b/source4/rpc_server/backupkey/dcesrv_backupkey.c
new file mode 100644
index 0000000000..e499128c88
--- /dev/null
+++ b/source4/rpc_server/backupkey/dcesrv_backupkey.c
@@ -0,0 +1,1306 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   endpoint server for the backupkey interface
+
+   Copyright (C) Matthieu Patou <mat@samba.org> 2010
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "rpc_server/dcerpc_server.h"
+#include "librpc/gen_ndr/ndr_backupkey.h"
+#include "dsdb/common/util.h"
+#include "dsdb/samdb/samdb.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "../lib/util/util_ldb.h"
+#include "param/param.h"
+#include "auth/session.h"
+#include "heimdal/lib/hx509/hx_locl.h"
+#include "heimdal/lib/hcrypto/rsa.h"
+#include "heimdal/lib/hcrypto/bn.h"
+#include "../lib/tsocket/tsocket.h"
+#include "../libcli/security/security.h"
+
+#define BACKUPKEY_MIN_VERSION 2
+#define BACKUPKEY_MAX_VERSION 3
+
+static const unsigned rsa_with_var_num[] = { 1, 2, 840, 113549, 1, 1, 1 };
+/* Equivalent to asn1_oid_id_pkcs1_rsaEncryption*/
+static const AlgorithmIdentifier _hx509_signature_rsa_with_var_num = {
+	{ 7, discard_const_p(unsigned, rsa_with_var_num) }, NULL
+};
+
+static NTSTATUS set_lsa_secret(TALLOC_CTX *mem_ctx,
+			       struct ldb_context *ldb,
+			       const char *name,
+			       const DATA_BLOB *secret)
+{
+	struct ldb_message *msg;
+	struct ldb_result *res;
+	struct ldb_dn *domain_dn;
+	struct ldb_dn *system_dn;
+	struct ldb_val val;
+	int ret;
+	char *name2;
+	struct timeval now = timeval_current();
+	NTTIME nt_now = timeval_to_nttime(&now);
+	const char *attrs[] = {
+		NULL
+	};
+
+	domain_dn = ldb_get_default_basedn(ldb);
+	if (!domain_dn) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	msg = ldb_msg_new(mem_ctx);
+	if (msg == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/*
+	 * This function is a lot like dcesrv_lsa_CreateSecret
+	 * in the rpc_server/lsa directory
+	 * The reason why we duplicate the effort here is that:
+	 * * we want to keep the former function static
+	 * * we want to avoid the burden of doing LSA calls
+	 *   when we can just manipulate the secrets directly
+	 * * taillor the function to the particular needs of backup protocol
+	 */
+
+	system_dn = samdb_search_dn(ldb, msg, domain_dn, "(&(objectClass=container)(cn=System))");
+	if (system_dn == NULL) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	name2 = talloc_asprintf(msg, "%s Secret", name);
+	if (name2 == NULL) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ret = ldb_search(ldb, mem_ctx, &res, system_dn, LDB_SCOPE_SUBTREE, attrs,
+			   "(&(cn=%s)(objectclass=secret))",
+			   ldb_binary_encode_string(mem_ctx, name2));
+
+	if (ret != LDB_SUCCESS ||  res->count != 0 ) {
+		DEBUG(0, ("Secret %s already exists !\n", name2));
+		talloc_free(msg);
+		return NT_STATUS_OBJECT_NAME_COLLISION;
+	}
+
+	/*
+	 * We don't care about previous value as we are
+	 * here only if the key didn't exists before
+	 */
+
+	msg->dn = ldb_dn_copy(mem_ctx, system_dn);
+	if (msg->dn == NULL) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+	if (!ldb_dn_add_child_fmt(msg->dn, "cn=%s", name2)) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ret = samdb_msg_add_string(ldb, mem_ctx, msg, "cn", name2);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+	ret = samdb_msg_add_string(ldb, mem_ctx, msg, "objectClass", "secret");
+	if (ret != LDB_SUCCESS) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+	ret = samdb_msg_add_uint64(ldb, mem_ctx, msg, "priorSetTime", nt_now);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+	val.data = secret->data;
+	val.length = secret->length;
+	ret = ldb_msg_add_value(msg, "currentValue", &val, NULL);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+	ret = samdb_msg_add_uint64(ldb, mem_ctx, msg, "lastSetTime", nt_now);
+	if (ret != LDB_SUCCESS) {
+		talloc_free(msg);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/*
+	 * create the secret with DSDB_MODIFY_RELAX
+	 * otherwise dsdb/samdb/ldb_modules/objectclass.c forbid
+	 * the create of LSA secret object
+	 */
+	ret = dsdb_add(ldb, msg, DSDB_MODIFY_RELAX);
+	if (ret != LDB_SUCCESS) {
+		DEBUG(0,("Failed to create secret record %s: %s\n",
+			ldb_dn_get_linearized(msg->dn),
+			ldb_errstring(ldb)));
+		talloc_free(msg);
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	talloc_free(msg);
+	return NT_STATUS_OK;
+}
+
+/* This function is pretty much like dcesrv_lsa_QuerySecret */
+static NTSTATUS get_lsa_secret(TALLOC_CTX *mem_ctx,
+			       struct ldb_context *ldb,
+			       const char *name,
+			       DATA_BLOB *secret)
+{
+	TALLOC_CTX *tmp_mem;
+	struct ldb_result *res;
+	struct ldb_dn *domain_dn;
+	struct ldb_dn *system_dn;
+	const struct ldb_val *val;
+	uint8_t *data;
+	const char *attrs[] = {
+		"currentValue",
+		NULL
+	};
+	int ret;
+
+	secret->data = NULL;
+	secret->length = 0;
+
+	domain_dn = ldb_get_default_basedn(ldb);
+	if (!domain_dn) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	tmp_mem = talloc_new(mem_ctx);
+	if (tmp_mem == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	system_dn = samdb_search_dn(ldb, tmp_mem, domain_dn, "(&(objectClass=container)(cn=System))");
+	if (system_dn == NULL) {
+		talloc_free(tmp_mem);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ret = ldb_search(ldb, mem_ctx, &res, system_dn, LDB_SCOPE_SUBTREE, attrs,
+			   "(&(cn=%s Secret)(objectclass=secret))",
+			   ldb_binary_encode_string(tmp_mem, name));
+
+	if (ret != LDB_SUCCESS || res->count == 0) {
+		talloc_free(tmp_mem);
+		/*
+		 * Important NOT to use NT_STATUS_OBJECT_NAME_NOT_FOUND
+		 * as this return value is used to detect the case
+		 * when we have the secret but without the currentValue
+		 * (case RODC)
+		 */
+		return NT_STATUS_RESOURCE_NAME_NOT_FOUND;
+	}
+
+	if (res->count > 1) {
+		DEBUG(0, ("Secret %s collision\n", name));
+		talloc_free(tmp_mem);
+		return NT_STATUS_INTERNAL_DB_CORRUPTION;
+	}
+
+	val = ldb_msg_find_ldb_val(res->msgs[0], "currentValue");
+	if (val == NULL) {
+		/*
+		 * The secret object is here but we don't have the secret value
+		 * The most common case is a RODC
+		 */
+		talloc_free(tmp_mem);
+		return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+	}
+
+	data = val->data;
+	secret->data = talloc_move(mem_ctx, &data);
+	secret->length = val->length;
+
+	talloc_free(tmp_mem);
+	return NT_STATUS_OK;
+}
+
+static DATA_BLOB *reverse_and_get_blob(TALLOC_CTX *mem_ctx, BIGNUM *bn)
+{
+	DATA_BLOB blob;
+	DATA_BLOB *rev = talloc(mem_ctx, DATA_BLOB);
+	uint32_t i;
+
+	blob.length = BN_num_bytes(bn);
+	blob.data = talloc_array(mem_ctx, uint8_t, blob.length);
+
+	if (blob.data == NULL) {
+		return NULL;
+	}
+
+	BN_bn2bin(bn, blob.data);
+
+	rev->data = talloc_array(mem_ctx, uint8_t, blob.length);
+	if (rev->data == NULL) {
+		return NULL;
+	}
+
+	for(i=0; i < blob.length; i++) {
+		rev->data[i] = blob.data[blob.length - i -1];
+	}
+	rev->length = blob.length;
+	talloc_free(blob.data);
+	return rev;
+}
+
+static BIGNUM *reverse_and_get_bignum(TALLOC_CTX *mem_ctx, DATA_BLOB *blob)
+{
+	BIGNUM *ret;
+	DATA_BLOB rev;
+	uint32_t i;
+
+	rev.data = talloc_array(mem_ctx, uint8_t, blob->length);
+	if (rev.data == NULL) {
+		return NULL;
+	}
+
+	for(i=0; i < blob->length; i++) {
+		rev.data[i] = blob->data[blob->length - i -1];
+	}
+	rev.length = blob->length;
+
+	ret = BN_bin2bn(rev.data, rev.length, NULL);
+	talloc_free(rev.data);
+
+	return ret;
+}
+
+static NTSTATUS get_pk_from_raw_keypair_params(TALLOC_CTX *ctx,
+				struct bkrp_exported_RSA_key_pair *keypair,
+				hx509_private_key *pk)
+{
+	hx509_context hctx;
+	RSA *rsa;
+	struct hx509_private_key_ops *ops;
+
+	hx509_context_init(&hctx);
+	ops = hx509_find_private_alg(&_hx509_signature_rsa_with_var_num.algorithm);
+	if (ops == NULL) {
+		DEBUG(0, ("Not supported algorithm\n"));
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	if (_hx509_private_key_init(pk, ops, NULL) != 0) {
+		hx509_context_free(&hctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	rsa = RSA_new();
+	if (rsa ==NULL) {
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	rsa->n = reverse_and_get_bignum(ctx, &(keypair->modulus));
+	if (rsa->n == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	rsa->d = reverse_and_get_bignum(ctx, &(keypair->private_exponent));
+	if (rsa->d == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	rsa->p = reverse_and_get_bignum(ctx, &(keypair->prime1));
+	if (rsa->p == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	rsa->q = reverse_and_get_bignum(ctx, &(keypair->prime2));
+	if (rsa->q == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	rsa->dmp1 = reverse_and_get_bignum(ctx, &(keypair->exponent1));
+	if (rsa->dmp1 == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	rsa->dmq1 = reverse_and_get_bignum(ctx, &(keypair->exponent2));
+	if (rsa->dmq1 == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	rsa->iqmp = reverse_and_get_bignum(ctx, &(keypair->coefficient));
+	if (rsa->iqmp == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+	rsa->e = reverse_and_get_bignum(ctx, &(keypair->public_exponent));
+	if (rsa->e == NULL) {
+		RSA_free(rsa);
+		hx509_context_free(&hctx);
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	_hx509_private_key_assign_rsa(*pk, rsa);
+
+	hx509_context_free(&hctx);
+	return NT_STATUS_OK;
+}
+
+static WERROR get_and_verify_access_check(TALLOC_CTX *sub_ctx,
+					  uint32_t version,
+					  uint8_t *key_and_iv,
+					  uint8_t *access_check,
+					  uint32_t access_check_len,
+					  struct dom_sid **access_sid)
+{
+	heim_octet_string iv;
+	heim_octet_string access_check_os;
+	hx509_crypto crypto;
+
+	DATA_BLOB blob_us;
+	uint32_t key_len;
+	uint32_t iv_len;
+	int res;
+	enum ndr_err_code ndr_err;
+	hx509_context hctx;
+
+	/* This one should not be freed */
+	const AlgorithmIdentifier *alg;
+
+	*access_sid = NULL;
+	switch (version) {
+	case 2:
+		key_len = 24;
+		iv_len = 8;
+		alg = hx509_crypto_des_rsdi_ede3_cbc();
+		break;
+
+	case 3:
+		key_len = 32;
+		iv_len = 16;
+		alg =hx509_crypto_aes256_cbc();
+		break;
+
+	default:
+		return WERR_INVALID_DATA;
+	}
+
+	hx509_context_init(&hctx);
+	res = hx509_crypto_init(hctx, NULL,
+				&(alg->algorithm),
+				&crypto);
+	hx509_context_free(&hctx);
+
+	if (res != 0) {
+		return WERR_INVALID_DATA;
+	}
+
+	res = hx509_crypto_set_key_data(crypto, key_and_iv, key_len);
+
+	iv.data = talloc_memdup(sub_ctx, key_len + key_and_iv, iv_len);
+	iv.length = iv_len;
+
+	if (res != 0) {
+		hx509_crypto_destroy(crypto);
+		return WERR_INVALID_DATA;
+	}
+
+	hx509_crypto_set_padding(crypto, HX509_CRYPTO_PADDING_NONE);
+	res = hx509_crypto_decrypt(crypto,
+		access_check,
+		access_check_len,
+		&iv,
+		&access_check_os);
+
+	if (res != 0) {
+		hx509_crypto_destroy(crypto);
+		return WERR_INVALID_DATA;
+	}
+
+	blob_us.data = access_check_os.data;
+	blob_us.length = access_check_os.length;
+
+	hx509_crypto_destroy(crypto);
+
+	if (version == 2) {
+		uint32_t hash_size = 20;
+		uint8_t hash[hash_size];
+		struct sha sctx;
+		struct bkrp_access_check_v2 uncrypted_accesscheckv2;
+
+		ndr_err = ndr_pull_struct_blob(&blob_us, sub_ctx, &uncrypted_accesscheckv2,
+					(ndr_pull_flags_fn_t)ndr_pull_bkrp_access_check_v2);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			/* Unable to unmarshall */
+			der_free_octet_string(&access_check_os);
+			return WERR_INVALID_DATA;
+		}
+		if (uncrypted_accesscheckv2.magic != 0x1) {
+			/* wrong magic */
+			der_free_octet_string(&access_check_os);
+			return WERR_INVALID_DATA;
+		}
+
+		SHA1_Init(&sctx);
+		SHA1_Update(&sctx, blob_us.data, blob_us.length - hash_size);
+		SHA1_Final(hash, &sctx);
+		der_free_octet_string(&access_check_os);
+		/*
+		 * We free it after the sha1 calculation because blob.data
+		 * point to the same area
+		 */
+
+		if (memcmp(hash, uncrypted_accesscheckv2.hash, hash_size) != 0) {
+			DEBUG(0, ("Wrong hash value in the access check in backup key remote protocol\n"));
+			return WERR_INVALID_DATA;
+		}
+		*access_sid = dom_sid_dup(sub_ctx, &(uncrypted_accesscheckv2.sid));
+		if (*access_sid == NULL) {
+			return WERR_NOMEM;
+		}
+		return WERR_OK;
+	}
+
+	if (version == 3) {
+		uint32_t hash_size = 64;
+		uint8_t hash[hash_size];
+		struct hc_sha512state sctx;
+		struct bkrp_access_check_v3 uncrypted_accesscheckv3;
+
+		ndr_err = ndr_pull_struct_blob(&blob_us, sub_ctx, &uncrypted_accesscheckv3,
+					(ndr_pull_flags_fn_t)ndr_pull_bkrp_access_check_v3);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			/* Unable to unmarshall */
+			der_free_octet_string(&access_check_os);
+			return WERR_INVALID_DATA;
+		}
+		if (uncrypted_accesscheckv3.magic != 0x1) {
+			/* wrong magic */
+			der_free_octet_string(&access_check_os);
+			return WERR_INVALID_DATA;
+		}
+
+		SHA512_Init(&sctx);
+		SHA512_Update(&sctx, blob_us.data, blob_us.length - hash_size);
+		SHA512_Final(hash, &sctx);
+		der_free_octet_string(&access_check_os);
+		/*
+		 * We free it after the sha1 calculation because blob.data
+		 * point to the same area
+		 */
+
+		if (memcmp(hash, uncrypted_accesscheckv3.hash, hash_size) != 0) {
+			DEBUG(0, ("Wrong hash value in the access check in backup key remote protocol\n"));
+			return WERR_INVALID_DATA;
+		}
+		*access_sid = dom_sid_dup(sub_ctx, &(uncrypted_accesscheckv3.sid));
+		if (*access_sid == NULL) {
+			return WERR_NOMEM;
+		}
+		return WERR_OK;
+	}
+
+	/* Never reached normally as we filtered at the switch / case level */
+	return WERR_INVALID_DATA;
+}
+
+static WERROR bkrp_do_uncrypt_client_wrap_key(struct dcesrv_call_state *dce_call,
+					      TALLOC_CTX *mem_ctx,
+					      struct bkrp_BackupKey *r,
+					      struct ldb_context *ldb_ctx)
+{
+	struct bkrp_client_side_wrapped uncrypt_request;
+	DATA_BLOB blob;
+	enum ndr_err_code ndr_err;
+	char *guid_string;
+	char *cert_secret_name;
+	DATA_BLOB secret;
+	DATA_BLOB *uncrypted;
+	NTSTATUS status;
+
+	blob.data = r->in.data_in;
+	blob.length = r->in.data_in_len;
+
+	if (r->in.data_in_len == 0 || r->in.data_in == NULL) {
+		return WERR_INVALID_PARAM;
+	}
+
+	ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &uncrypt_request,
+				       (ndr_pull_flags_fn_t)ndr_pull_bkrp_client_side_wrapped);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		return WERR_INVALID_PARAM;
+	}
+
+	if (uncrypt_request.version < BACKUPKEY_MIN_VERSION) {
+		return WERR_INVALID_PARAMETER;
+	}
+
+	if (uncrypt_request.version > BACKUPKEY_MAX_VERSION) {
+		return WERR_INVALID_PARAMETER;
+	}
+
+	guid_string = GUID_string(mem_ctx, &uncrypt_request.guid);
+	if (guid_string == NULL) {
+		return WERR_NOMEM;
+	}
+
+	cert_secret_name = talloc_asprintf(mem_ctx,
+					   "BCKUPKEY_%s",
+					   guid_string);
+	if (cert_secret_name == NULL) {
+		return WERR_NOMEM;
+	}
+
+	status = get_lsa_secret(mem_ctx,
+				ldb_ctx,
+				cert_secret_name,
+				&secret);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("Error while fetching secret %s\n", cert_secret_name));
+		if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
+			/* we do not have the real secret attribute */
+			return WERR_INVALID_PARAMETER;
+		} else {
+			return WERR_FILE_NOT_FOUND;
+		}
+	}
+
+	if (secret.length != 0) {
+		hx509_context hctx;
+		struct bkrp_exported_RSA_key_pair keypair;
+		hx509_private_key pk;
+		uint32_t i, res;
+		struct dom_sid *access_sid = NULL;
+		heim_octet_string reversed_secret;
+		heim_octet_string uncrypted_secret;
+		AlgorithmIdentifier alg;
+		struct dom_sid *caller_sid;
+		DATA_BLOB blob_us;
+		WERROR werr;
+
+		ndr_err = ndr_pull_struct_blob(&secret, mem_ctx, &keypair, (ndr_pull_flags_fn_t)ndr_pull_bkrp_exported_RSA_key_pair);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			DEBUG(1, ("Unable to parse the ndr encoded cert in key %s\n", cert_secret_name));
+			return WERR_FILE_NOT_FOUND;
+		}
+
+		status = get_pk_from_raw_keypair_params(mem_ctx, &keypair, &pk);
+		if (!NT_STATUS_IS_OK(status)) {
+			return WERR_INTERNAL_ERROR;
+		}
+
+		reversed_secret.data = talloc_array(mem_ctx, uint8_t,
+						    uncrypt_request.encrypted_secret_len);
+		if (reversed_secret.data == NULL) {
+			_hx509_private_key_free(&pk);
+			return WERR_NOMEM;
+		}
+
+		/* The secret has to be reversed ... */
+		for(i=0; i< uncrypt_request.encrypted_secret_len; i++) {
+			uint8_t *reversed = (uint8_t *)reversed_secret.data;
+			uint8_t *uncrypt = uncrypt_request.encrypted_secret;
+			reversed[i] = uncrypt[uncrypt_request.encrypted_secret_len - 1 - i];
+		}
+		reversed_secret.length = uncrypt_request.encrypted_secret_len;
+
+		/*
+		 * Let's try to decrypt the secret now that
+		 * we have the private key ...
+		 */
+		hx509_context_init(&hctx);
+		res = _hx509_private_key_private_decrypt(hctx, &reversed_secret,
+							 &alg.algorithm, pk,
+							 &uncrypted_secret);
+		hx509_context_free(&hctx);
+		_hx509_private_key_free(&pk);
+		if (res != 0) {
+			/* We are not able to decrypt the secret, looks like something is wrong */
+			return WERR_INVALID_DATA;
+		}
+		blob_us.data = uncrypted_secret.data;
+		blob_us.length = uncrypted_secret.length;
+
+		if (uncrypt_request.version == 2) {
+			struct bkrp_encrypted_secret_v2 uncrypted_secretv2;
+
+			ndr_err = ndr_pull_struct_blob(&blob_us, mem_ctx, &uncrypted_secretv2,
+					(ndr_pull_flags_fn_t)ndr_pull_bkrp_encrypted_secret_v2);
+			der_free_octet_string(&uncrypted_secret);
+			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+				/* Unable to unmarshall */
+				return WERR_INVALID_DATA;
+			}
+			if (uncrypted_secretv2.magic != 0x20) {
+				/* wrong magic */
+				return WERR_INVALID_DATA;
+			}
+
+			werr = get_and_verify_access_check(mem_ctx, 2,
+							   uncrypted_secretv2.payload_key,
+							   uncrypt_request.access_check,
+							   uncrypt_request.access_check_len,
+							   &access_sid);
+			if (!W_ERROR_IS_OK(werr)) {
+				return werr;
+			}
+			uncrypted = talloc(mem_ctx, DATA_BLOB);
+			if (uncrypted == NULL) {
+				return WERR_INVALID_DATA;
+			}
+
+			uncrypted->data = uncrypted_secretv2.secret;
+			uncrypted->length = uncrypted_secretv2.secret_len;
+		}
+		if (uncrypt_request.version == 3) {
+			struct bkrp_encrypted_secret_v3 uncrypted_secretv3;
+
+			ndr_err = ndr_pull_struct_blob(&blob_us, mem_ctx, &uncrypted_secretv3,
+					(ndr_pull_flags_fn_t)ndr_pull_bkrp_encrypted_secret_v3);
+
+			der_free_octet_string(&uncrypted_secret);
+			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+				/* Unable to unmarshall */
+				return WERR_INVALID_DATA;
+			}
+
+			if (uncrypted_secretv3.magic1 != 0x30  ||
+			    uncrypted_secretv3.magic2 != 0x6610 ||
+			    uncrypted_secretv3.magic3 != 0x800e) {
+				/* wrong magic */
+				return WERR_INVALID_DATA;
+			}
+
+			werr = get_and_verify_access_check(mem_ctx, 3,
+							   uncrypted_secretv3.payload_key,
+							   uncrypt_request.access_check,
+							   uncrypt_request.access_check_len,
+							   &access_sid);
+			if (!W_ERROR_IS_OK(werr)) {
+				return werr;
+			}
+
+			uncrypted = talloc(mem_ctx, DATA_BLOB);
+			if (uncrypted == NULL) {
+				return WERR_INVALID_DATA;
+			}
+
+			uncrypted->data = uncrypted_secretv3.secret;
+			uncrypted->length = uncrypted_secretv3.secret_len;
+		}
+
+		caller_sid = &dce_call->conn->auth_state.session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
+
+		if (!dom_sid_equal(caller_sid, access_sid)) {
+			talloc_free(uncrypted);
+			return WERR_INVALID_ACCESS;
+		}
+
+		/*
+		 * Yeah if we are here all looks pretty good:
+		 * - hash is ok
+		 * - user sid is the same as the one in access check
+		 * - we were able to decrypt the whole stuff
+		 */
+	}
+
+	if (uncrypted->data == NULL) {
+		return WERR_INVALID_DATA;
+	}
+
+	/* There is a magic value a the beginning of the data
+	 * we can use an adhoc structure but as the
+	 * parent structure is just an array of bytes it a lot of work
+	 * work just prepending 4 bytes
+	 */
+	*(r->out.data_out) = talloc_zero_array(mem_ctx, uint8_t, uncrypted->length + 4);
+	W_ERROR_HAVE_NO_MEMORY(*(r->out.data_out));
+	memcpy(4+*(r->out.data_out), uncrypted->data, uncrypted->length);
+	*(r->out.data_out_len) = uncrypted->length + 4;
+
+	return WERR_OK;
+}
+
+static WERROR create_heimdal_rsa_key(TALLOC_CTX *ctx, hx509_context *hctx,
+				     hx509_private_key *pk, RSA **_rsa)
+{
+	BIGNUM *pub_expo;
+	RSA *rsa;
+	int ret;
+	uint8_t *p0, *p;
+	size_t len;
+	int bits = 2048;
+
+	*_rsa = NULL;
+
+	pub_expo = BN_new();
+	if(pub_expo == NULL) {
+		return WERR_INTERNAL_ERROR;
+	}
+
+	/* set the public expo to 65537 like everyone */
+	BN_set_word(pub_expo, 0x10001);
+
+	rsa = RSA_new();
+	if(rsa == NULL) {
+		BN_free(pub_expo);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	ret = RSA_generate_key_ex(rsa, bits, pub_expo, NULL);
+	if(ret != 1) {
+		RSA_free(rsa);
+		BN_free(pub_expo);
+		return WERR_INTERNAL_ERROR;
+	}
+	BN_free(pub_expo);
+
+	len = i2d_RSAPrivateKey(rsa, NULL);
+	if (len < 1) {
+		RSA_free(rsa);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	p0 = p = talloc_array(ctx, uint8_t, len);
+	if (p == NULL) {
+		RSA_free(rsa);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	len = i2d_RSAPrivateKey(rsa, &p);
+	if (len < 1) {
+		RSA_free(rsa);
+		talloc_free(p0);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	/*
+	 * To dump the key we can use :
+	 * rk_dumpdata("h5lkey", p0, len);
+	 */
+	ret = _hx509_parse_private_key(*hctx, &_hx509_signature_rsa_with_var_num ,
+				       p0, len, HX509_KEY_FORMAT_DER, pk);
+	memset(p0, 0, len);
+	talloc_free(p0);
+	if (ret !=0) {
+		RSA_free(rsa);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	*_rsa = rsa;
+	return WERR_OK;
+}
+
+static WERROR self_sign_cert(TALLOC_CTX *ctx, hx509_context *hctx, hx509_request *req,
+				time_t lifetime, hx509_private_key *private_key,
+				hx509_cert *cert, DATA_BLOB *guidblob)
+{
+	SubjectPublicKeyInfo spki;
+	hx509_name subject = NULL;
+	hx509_ca_tbs tbs;
+	struct heim_bit_string uniqueid;
+	int ret;
+
+	uniqueid.data = talloc_memdup(ctx, guidblob->data, guidblob->length);
+	/* uniqueid is a bit string in which each byte represent 1 bit (1 or 0)
+	 * so as 1 byte is 8 bits we need to provision 8 times more space as in the
+	 * blob
+	 */
+	uniqueid.length = 8 * guidblob->length;
+
+	memset(&spki, 0, sizeof(spki));
+
+	ret = _hx509_request_get_name(*hctx, *req, &subject);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		return WERR_INTERNAL_ERROR;
+	}
+	ret = _hx509_request_get_SubjectPublicKeyInfo(*hctx, *req, &spki);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	ret = hx509_ca_tbs_init(*hctx, &tbs);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		free_SubjectPublicKeyInfo(&spki);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	ret = hx509_ca_tbs_set_spki(*hctx, tbs, &spki);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		free_SubjectPublicKeyInfo(&spki);
+		return WERR_INTERNAL_ERROR;
+	}
+	ret = hx509_ca_tbs_set_subject(*hctx, tbs, subject);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		free_SubjectPublicKeyInfo(&spki);
+		hx509_ca_tbs_free(&tbs);
+		return WERR_INTERNAL_ERROR;
+	}
+	ret = hx509_ca_tbs_set_ca(*hctx, tbs, 1);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		free_SubjectPublicKeyInfo(&spki);
+		hx509_ca_tbs_free(&tbs);
+		return WERR_INTERNAL_ERROR;
+	}
+	ret = hx509_ca_tbs_set_notAfter_lifetime(*hctx, tbs, lifetime);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		free_SubjectPublicKeyInfo(&spki);
+		hx509_ca_tbs_free(&tbs);
+		return WERR_INTERNAL_ERROR;
+	}
+	ret = hx509_ca_tbs_set_unique(*hctx, tbs, &uniqueid, &uniqueid);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		free_SubjectPublicKeyInfo(&spki);
+		hx509_ca_tbs_free(&tbs);
+		return WERR_INTERNAL_ERROR;
+	}
+	ret = hx509_ca_sign_self(*hctx, tbs, *private_key, cert);
+	if (ret !=0) {
+		talloc_free(uniqueid.data);
+		hx509_name_free(&subject);
+		free_SubjectPublicKeyInfo(&spki);
+		hx509_ca_tbs_free(&tbs);
+		return WERR_INTERNAL_ERROR;
+	}
+	hx509_name_free(&subject);
+	free_SubjectPublicKeyInfo(&spki);
+	hx509_ca_tbs_free(&tbs);
+
+	return WERR_OK;
+}
+
+static WERROR create_req(TALLOC_CTX *ctx, hx509_context *hctx, hx509_request *req,
+			 hx509_private_key *signer,RSA **rsa, const char *dn)
+{
+	int ret;
+	SubjectPublicKeyInfo key;
+
+	hx509_name name;
+	WERROR w_err;
+
+	w_err = create_heimdal_rsa_key(ctx, hctx, signer, rsa);
+	if (!W_ERROR_IS_OK(w_err)) {
+		return w_err;
+	}
+
+	_hx509_request_init(*hctx, req);
+	ret = hx509_parse_name(*hctx, dn, &name);
+	if (ret != 0) {
+		RSA_free(*rsa);
+		_hx509_private_key_free(signer);
+		_hx509_request_free(req);
+		hx509_name_free(&name);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	ret = _hx509_request_set_name(*hctx, *req, name);
+	if (ret != 0) {
+		RSA_free(*rsa);
+		_hx509_private_key_free(signer);
+		_hx509_request_free(req);
+		hx509_name_free(&name);
+		return WERR_INTERNAL_ERROR;
+	}
+	hx509_name_free(&name);
+
+	ret = _hx509_private_key2SPKI(*hctx, *signer, &key);
+	if (ret != 0) {
+		RSA_free(*rsa);
+		_hx509_private_key_free(signer);
+		_hx509_request_free(req);
+		return WERR_INTERNAL_ERROR;
+	}
+	ret = _hx509_request_set_SubjectPublicKeyInfo(*hctx, *req, &key);
+	if (ret != 0) {
+		RSA_free(*rsa);
+		_hx509_private_key_free(signer);
+		free_SubjectPublicKeyInfo(&key);
+		_hx509_request_free(req);
+		return WERR_INTERNAL_ERROR;
+	}
+
+	free_SubjectPublicKeyInfo(&key);
+
+	return WERR_OK;
+}
+
+/* Return an error when we fail to generate a certificate */
+static WERROR generate_bkrp_cert(TALLOC_CTX *ctx, struct dcesrv_call_state *dce_call, struct ldb_context *ldb_ctx, const char *dn)
+{
+
+	struct heim_octet_string data;
+	WERROR w_err;
+	RSA *rsa;
+	hx509_context hctx;
+	hx509_private_key pk;
+	hx509_request req;
+	hx509_cert cert;
+	DATA_BLOB blob;
+	DATA_BLOB blobkeypair;
+	DATA_BLOB *tmp;
+	int ret;
+	bool ok = true;
+	struct GUID guid = GUID_random();
+	NTSTATUS status;
+	char *secret_name;
+	struct bkrp_exported_RSA_key_pair keypair;
+	enum ndr_err_code ndr_err;
+	uint32_t nb_days_validity = 365;
+
+	DEBUG(0, ("Trying to generate a certificate\n"));
+	hx509_context_init(&hctx);
+	w_err = create_req(ctx, &hctx, &req, &pk, &rsa, dn);
+	if (!W_ERROR_IS_OK(w_err)) {
+		hx509_context_free(&hctx);
+		return w_err;
+	}
+
+	status = GUID_to_ndr_blob(&guid, ctx, &blob);
+	if (!NT_STATUS_IS_OK(status)) {
+		hx509_context_free(&hctx);
+		_hx509_private_key_free(&pk);
+		RSA_free(rsa);
+		return WERR_INVALID_DATA;
+	}
+
+	w_err = self_sign_cert(ctx, &hctx, &req, nb_days_validity, &pk, &cert, &blob);
+	if (!W_ERROR_IS_OK(w_err)) {
+		_hx509_private_key_free(&pk);
+		hx509_context_free(&hctx);
+		return WERR_INVALID_DATA;
+	}
+
+	ret = hx509_cert_binary(hctx, cert, &data);
+	if (ret !=0) {
+		hx509_cert_free(cert);
+		_hx509_private_key_free(&pk);
+		hx509_context_free(&hctx);
+		return WERR_INVALID_DATA;
+	}
+
+	keypair.cert.data = talloc_memdup(ctx, data.data, data.length);
+	keypair.cert.length = data.length;
+
+	/*
+	 * Heimdal's bignum are big endian and the
+	 * structure expect it to be in little endian
+	 * so we reverse the buffer to make it work
+	 */
+	tmp = reverse_and_get_blob(ctx, rsa->e);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.public_exponent = *tmp;
+		SMB_ASSERT(tmp->length <= 4);
+		/*
+		 * The value is now in little endian but if can happen that the length is
+		 * less than 4 bytes.
+		 * So if we have less than 4 bytes we pad with zeros so that it correctly
+		 * fit into the structure.
+		 */
+		if (tmp->length < 4) {
+			/*
+			 * We need the expo to fit 4 bytes
+			 */
+			keypair.public_exponent.data = talloc_zero_array(ctx, uint8_t, 4);
+			memcpy(keypair.public_exponent.data, tmp->data, tmp->length);
+			keypair.public_exponent.length = 4;
+		}
+	}
+
+	tmp = reverse_and_get_blob(ctx,rsa->d);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.private_exponent = *tmp;
+	}
+
+	tmp = reverse_and_get_blob(ctx,rsa->n);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.modulus = *tmp;
+	}
+
+	tmp = reverse_and_get_blob(ctx,rsa->p);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.prime1 = *tmp;
+	}
+
+	tmp = reverse_and_get_blob(ctx,rsa->q);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.prime2 = *tmp;
+	}
+
+	tmp = reverse_and_get_blob(ctx,rsa->dmp1);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.exponent1 = *tmp;
+	}
+
+	tmp = reverse_and_get_blob(ctx,rsa->dmq1);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.exponent2 = *tmp;
+	}
+
+	tmp = reverse_and_get_blob(ctx,rsa->iqmp);
+	if (tmp == NULL) {
+		ok = false;
+	} else {
+		keypair.coefficient = *tmp;
+	}
+
+	/* One of the keypair allocation was wrong */
+	if (ok == false) {
+		der_free_octet_string(&data);
+		hx509_cert_free(cert);
+		_hx509_private_key_free(&pk);
+		hx509_context_free(&hctx);
+		RSA_free(rsa);
+		return WERR_INVALID_DATA;
+	}
+	keypair.certificate_len = keypair.cert.length;
+	DEBUG(0, ("Len of priv key: %d pub_expo: %d\n", keypair.private_exponent.length, keypair.public_exponent.length));
+	ndr_err = ndr_push_struct_blob(&blobkeypair, ctx, &keypair, (ndr_push_flags_fn_t)ndr_push_bkrp_exported_RSA_key_pair);
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		der_free_octet_string(&data);
+		hx509_cert_free(cert);
+		_hx509_private_key_free(&pk);
+		hx509_context_free(&hctx);
+		RSA_free(rsa);
+		return WERR_INVALID_DATA;
+	}
+
+	secret_name = talloc_asprintf(ctx, "BCKUPKEY_%s", GUID_string(ctx, &guid));
+	if (secret_name == NULL) {
+		der_free_octet_string(&data);
+		hx509_cert_free(cert);
+		_hx509_private_key_free(&pk);
+		hx509_context_free(&hctx);
+		RSA_free(rsa);
+		return WERR_OUTOFMEMORY;
+	}
+
+	status = set_lsa_secret(ctx, ldb_ctx, secret_name, &blobkeypair);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("Failed to save the secret %s\n", secret_name));
+	}
+	talloc_free(secret_name);
+
+	GUID_to_ndr_blob(&guid, ctx, &blob);
+	status = set_lsa_secret(ctx, ldb_ctx, "BCKUPKEY_PREFERRED", &blob);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("Failed to save the secret BCKUPKEY_PREFERRED\n"));
+	}
+
+	der_free_octet_string(&data);
+	hx509_cert_free(cert);
+	_hx509_private_key_free(&pk);
+	hx509_context_free(&hctx);
+	RSA_free(rsa);
+	return WERR_OK;
+}
+
+static WERROR bkrp_do_retreive_client_wrap_key(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
+		struct bkrp_BackupKey *r ,struct ldb_context *ldb_ctx)
+{
+	struct GUID guid;
+	char *guid_string;
+	DATA_BLOB secret;
+	enum ndr_err_code ndr_err;
+	NTSTATUS status;
+
+	/*
+	 * here we basicaly need to return our certificate
+	 * search for lsa secret BCKUPKEY_PREFERRED first
+	 */
+
+	status = get_lsa_secret(mem_ctx,
+				ldb_ctx,
+				"BCKUPKEY_PREFERRED",
+				&secret);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("Error while fetching secret BCKUPKEY_PREFERRED\n"));
+		if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
+			/* Ok we can be in this case if there was no certs */
+			struct loadparm_context *lp_ctx = dce_call->conn->dce_ctx->lp_ctx;
+			char *dn = talloc_asprintf(mem_ctx, "CN=%s.%s",
+							lpcfg_netbios_name(lp_ctx),
+							lpcfg_realm(lp_ctx));
+
+			WERROR werr =  generate_bkrp_cert(mem_ctx, dce_call, ldb_ctx, dn);
+			if (!W_ERROR_IS_OK(werr)) {
+				return WERR_INVALID_PARAMETER;
+			}
+			status = get_lsa_secret(mem_ctx,
+					ldb_ctx,
+					"BCKUPKEY_PREFERRED",
+					&secret);
+
+			if (!NT_STATUS_IS_OK(status)) {
+				/* Ok we really don't manage to get this certs ...*/
+				DEBUG(0, ("Unable to locate BCKUPKEY_PREFERRED after cert generation\n"));
+				return WERR_FILE_NOT_FOUND;
+			}
+		} else {
+			/* In theory we should NEVER reach this point as it
+			   should only appear in a rodc server */
+			/* we do not have the real secret attribute */
+			return WERR_INVALID_PARAMETER;
+		}
+	}
+
+	if (secret.length != 0) {
+		char *cert_secret_name;
+
+		status = GUID_from_ndr_blob(&secret, &guid);
+		if (!NT_STATUS_IS_OK(status)) {
+			return WERR_FILE_NOT_FOUND;
+		}
+
+		guid_string = GUID_string(mem_ctx, &guid);
+		if (guid_string == NULL) {
+			/* We return file not found because the client
+			 * expect this error
+			 */
+			return WERR_FILE_NOT_FOUND;
+		}
+				
+		cert_secret_name = talloc_asprintf(mem_ctx,
+							"BCKUPKEY_%s",
+							guid_string);
+		status = get_lsa_secret(mem_ctx,
+					ldb_ctx,
+					cert_secret_name,
+					&secret);
+		if (!NT_STATUS_IS_OK(status)) {
+			return WERR_FILE_NOT_FOUND;
+		}
+
+		if (secret.length != 0) {
+			struct bkrp_exported_RSA_key_pair keypair;
+			ndr_err = ndr_pull_struct_blob(&secret, mem_ctx, &keypair,
+					(ndr_pull_flags_fn_t)ndr_pull_bkrp_exported_RSA_key_pair);
+			if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+				return WERR_FILE_NOT_FOUND;
+			}
+			*(r->out.data_out_len) = keypair.cert.length;
+			*(r->out.data_out) = talloc_memdup(mem_ctx, keypair.cert.data, keypair.cert.length);
+			W_ERROR_HAVE_NO_MEMORY(*(r->out.data_out));
+			return WERR_OK;
+		} else {
+			DEBUG(10, ("No or broken secret called %s\n", cert_secret_name));
+			return WERR_FILE_NOT_FOUND;
+		}
+	} else {
+		DEBUG(10, ("No secret BCKUPKEY_PREFERRED\n"));
+		return WERR_FILE_NOT_FOUND;
+	}
+
+	return WERR_NOT_SUPPORTED;
+}
+
+WERROR dcesrv_bkrp_BackupKey (struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx, struct bkrp_BackupKey *r)
+{
+	WERROR error = WERR_INVALID_PARAM;
+	struct ldb_context *ldb_ctx;
+	bool is_rodc;
+	const char *addr = "unknown";
+	/* At which level we start to add more debug of what is done in the protocol */
+	int debuglevel =4;
+
+	if (DEBUGLEVEL >= debuglevel) {
+		const struct tsocket_address *remote_address;
+		remote_address = dcesrv_connection_get_remote_address(dce_call->conn);
+		if (tsocket_address_is_inet(remote_address, "ip")) {
+			addr = tsocket_address_inet_addr_string(remote_address, mem_ctx);
+			W_ERROR_HAVE_NO_MEMORY(addr);
+		}
+	}
+
+	if (lpcfg_server_role(dce_call->conn->dce_ctx->lp_ctx) != ROLE_DOMAIN_CONTROLLER) {
+		return WERR_NOT_SUPPORTED;
+	}
+
+	if (!dce_call->conn->auth_state.auth_info ||
+		dce_call->conn->auth_state.auth_info->auth_level != DCERPC_AUTH_LEVEL_PRIVACY) {
+		DCESRV_FAULT(DCERPC_FAULT_ACCESS_DENIED);
+	}
+
+	ldb_ctx = samdb_connect(mem_ctx, dce_call->event_ctx,
+				dce_call->conn->dce_ctx->lp_ctx,
+				system_session(dce_call->conn->dce_ctx->lp_ctx), 0);
+
+	if (samdb_rodc(ldb_ctx, &is_rodc) != LDB_SUCCESS) {
+		talloc_unlink(mem_ctx, ldb_ctx);
+		return WERR_INVALID_PARAM;
+	}
+
+	if (!is_rodc) {
+		if(strncasecmp(GUID_string(mem_ctx, r->in.guidActionAgent),
+			BACKUPKEY_RESTORE_GUID, strlen(BACKUPKEY_RESTORE_GUID)) == 0) {
+			DEBUG(debuglevel, ("Client %s requested to decrypt a client side wrapped secret\n", addr));
+			error = bkrp_do_uncrypt_client_wrap_key(dce_call, mem_ctx, r, ldb_ctx);
+		}
+
+		if (strncasecmp(GUID_string(mem_ctx, r->in.guidActionAgent),
+			BACKUPKEY_RETRIEVE_BACKUP_KEY_GUID, strlen(BACKUPKEY_RETRIEVE_BACKUP_KEY_GUID)) == 0) {
+			DEBUG(debuglevel, ("Client %s requested certificate for client wrapped secret\n", addr));
+			error = bkrp_do_retreive_client_wrap_key(dce_call, mem_ctx, r, ldb_ctx);
+		}
+	}
+	/*else: I am a RODC so I don't handle backup key protocol */
+
+	talloc_unlink(mem_ctx, ldb_ctx);
+	return error;
+}
+
+/* include the generated boilerplate */
+#include "librpc/gen_ndr/ndr_backupkey_s.c"
diff --git a/source4/rpc_server/wscript_build b/source4/rpc_server/wscript_build
index 3aafaa566a..3d1d36a3a3 100644
--- a/source4/rpc_server/wscript_build
+++ b/source4/rpc_server/wscript_build
@@ -99,6 +99,15 @@ bld.SAMBA_MODULE('dcerpc_lsarpc',
 	)
 
 
+bld.SAMBA_MODULE('dcerpc_backupkey',
+	source='backupkey/dcesrv_backupkey.c ',
+	autoproto='backupkey/proto.h',
+	subsystem='dcerpc_server',
+	init_function='dcerpc_server_backupkey_init',
+	deps='samdb DCERPC_COMMON NDR_BACKUPKEY RPC_NDR_BACKUPKEY'
+	)
+
+
 bld.SAMBA_MODULE('dcerpc_spoolss',
 	source='spoolss/dcesrv_spoolss.c',
 	subsystem='dcerpc_server',