samsync: add samsync_fix_delta_array()

This code is vastly based on samba4 code.

Guenther
(cherry picked from commit 5b68be96996a710988b1fd1c176cd5dff0f2c6af)
(This used to be commit 2c53d87de4ecc5ac9c43bc7488a03bceecf35140)

2 files changed, 189 insertions, 0 deletions

diff --git a/source3/Makefile.in b/source3/Makefile.in
index 917b0bfe36..3eb11421d0 100644
--- a/source3/Makefile.in
+++ b/source3/Makefile.in
@@ -892,6 +892,7 @@ SMBCONFTORT_OBJ = $(SMBCONFTORT_OBJ0) \
 		  $(POPT_LIB_OBJ)
 
 LIBNET_OBJ = libnet/libnet_join.o \
+	     libnet/libnet_samsync.o \
 	     librpc/gen_ndr/ndr_libnet_join.o
 
 NET_OBJ1 = utils/net.o utils/net_ads.o utils/net_help.o \
diff --git a/source3/libnet/libnet_samsync.c b/source3/libnet/libnet_samsync.c
new file mode 100644
index 0000000000..e45a84568c
--- /dev/null
+++ b/source3/libnet/libnet_samsync.c
@@ -0,0 +1,188 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Extract the user/system database from a remote SamSync server
+
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+   Copyright (C) Guenther Deschner <gd@samba.org> 2008
+
+   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"
+
+/**
+ * Decrypt and extract the user's passwords.
+ *
+ * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted)
+ * passwords back into the structure
+ */
+
+static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
+			 DATA_BLOB *session_key,
+			 bool rid_crypt,
+			 enum netr_SamDatabaseID database_id,
+			 struct netr_DELTA_ENUM *delta)
+{
+
+	uint32_t rid = delta->delta_id_union.rid;
+	struct netr_DELTA_USER *user = delta->delta_union.user;
+	struct samr_Password lm_hash;
+	struct samr_Password nt_hash;
+	const char *username = user->account_name.string;
+
+	if (rid_crypt) {
+		if (user->lm_password_present) {
+			sam_pwd_hash(rid, user->lmpassword.hash, lm_hash.hash, 0);
+			user->lmpassword = lm_hash;
+		}
+
+		if (user->nt_password_present) {
+			sam_pwd_hash(rid, user->ntpassword.hash, nt_hash.hash, 0);
+			user->ntpassword = nt_hash;
+		}
+	}
+
+	if (user->user_private_info.SensitiveData) {
+		DATA_BLOB data;
+		struct netr_USER_KEYS keys;
+		enum ndr_err_code ndr_err;
+		data.data = user->user_private_info.SensitiveData;
+		data.length = user->user_private_info.DataLength;
+		SamOEMhashBlob(data.data, data.length, session_key);
+		user->user_private_info.SensitiveData = data.data;
+		user->user_private_info.DataLength = data.length;
+
+		ndr_err = ndr_pull_struct_blob(&data, mem_ctx, &keys,
+			(ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
+		if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+			dump_data(10, data.data, data.length);
+			return ndr_map_error2ntstatus(ndr_err);
+		}
+
+		if (keys.keys.keys2.lmpassword.length == 16) {
+			if (rid_crypt) {
+				sam_pwd_hash(rid,
+					     keys.keys.keys2.lmpassword.pwd.hash,
+					     lm_hash.hash, 0);
+				user->lmpassword = lm_hash;
+			} else {
+				user->lmpassword = keys.keys.keys2.lmpassword.pwd;
+			}
+			user->lm_password_present = true;
+		}
+		if (keys.keys.keys2.ntpassword.length == 16) {
+			if (rid_crypt) {
+				sam_pwd_hash(rid,
+					     keys.keys.keys2.ntpassword.pwd.hash,
+					     nt_hash.hash, 0);
+				user->ntpassword = nt_hash;
+			} else {
+				user->ntpassword = keys.keys.keys2.ntpassword.pwd;
+			}
+			user->nt_password_present = true;
+		}
+		/* TODO: rid decrypt history fields */
+	}
+	return NT_STATUS_OK;
+}
+
+/**
+ * Decrypt and extract the secrets
+ *
+ * The writes decrypted secrets back into the structure
+ */
+static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
+			   DATA_BLOB *session_key,
+			   enum netr_SamDatabaseID database_id,
+			   struct netr_DELTA_ENUM *delta)
+{
+	struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
+
+	SamOEMhashBlob(secret->current_cipher.cipher_data,
+		       secret->current_cipher.maxlen,
+		       session_key);
+
+	SamOEMhashBlob(secret->old_cipher.cipher_data,
+		       secret->old_cipher.maxlen,
+		       session_key);
+
+	return NT_STATUS_OK;
+}
+
+/**
+ * Fix up the delta, dealing with encryption issues so that the final
+ * callback need only do the printing or application logic
+ */
+
+static NTSTATUS samsync_fix_delta(TALLOC_CTX *mem_ctx,
+				  DATA_BLOB *session_key,
+				  bool rid_crypt,
+				  enum netr_SamDatabaseID database_id,
+				  struct netr_DELTA_ENUM *delta)
+{
+	NTSTATUS status = NT_STATUS_OK;
+
+	switch (delta->delta_type) {
+		case NETR_DELTA_USER:
+
+			status = fix_user(mem_ctx,
+					  session_key,
+					  rid_crypt,
+					  database_id,
+					  delta);
+			break;
+		case NETR_DELTA_SECRET:
+
+			status = fix_secret(mem_ctx,
+					    session_key,
+					    database_id,
+					    delta);
+			break;
+		default:
+			break;
+	}
+
+	return status;
+}
+
+/**
+ * Fix up the delta, dealing with encryption issues so that the final
+ * callback need only do the printing or application logic
+ */
+
+NTSTATUS samsync_fix_delta_array(TALLOC_CTX *mem_ctx,
+				 DATA_BLOB *session_key,
+				 bool rid_crypt,
+				 enum netr_SamDatabaseID database_id,
+				 struct netr_DELTA_ENUM_ARRAY *r)
+{
+	NTSTATUS status;
+	int i;
+
+	for (i = 0; i < r->num_deltas; i++) {
+
+		status = samsync_fix_delta(mem_ctx,
+					   session_key,
+					   rid_crypt,
+					   database_id,
+					   &r->delta_enum[i]);
+		if (!NT_STATUS_IS_OK(status)) {
+			return status;
+		}
+	}
+
+	return NT_STATUS_OK;
+}