2 Unix SMB/CIFS implementation.
4 Extract the user/system database from a remote SamSync server
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include "libnet/libnet.h"
26 #include "libcli/auth/libcli_auth.h"
27 #include "auth/gensec/gensec.h"
28 #include "auth/gensec/schannel_proto.h"
29 #include "librpc/gen_ndr/ndr_netlogon.h"
30 #include "librpc/gen_ndr/ndr_netlogon_c.h"
34 * Decrypt and extract the user's passwords.
36 * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure
38 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
39 struct creds_CredentialState *creds,
40 enum netr_SamDatabaseID database,
41 struct netr_DELTA_ENUM *delta,
45 uint32_t rid = delta->delta_id_union.rid;
46 struct netr_DELTA_USER *user = delta->delta_union.user;
47 struct samr_Password lm_hash;
48 struct samr_Password nt_hash;
49 const char *username = user->account_name.string;
52 if (user->lm_password_present) {
53 sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
54 user->lmpassword = lm_hash;
57 if (user->nt_password_present) {
58 sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
59 user->ntpassword = nt_hash;
62 if (user->user_private_info.SensitiveData) {
64 struct netr_USER_KEYS keys;
65 data.data = user->user_private_info.SensitiveData;
66 data.length = user->user_private_info.DataLength;
67 creds_arcfour_crypt(creds, data.data, data.length);
68 user->user_private_info.SensitiveData = data.data;
69 user->user_private_info.DataLength = data.length;
71 nt_status = ndr_pull_struct_blob(&data, mem_ctx, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
72 if (NT_STATUS_IS_OK(nt_status)) {
73 if (keys.keys.keys2.lmpassword.length == 16) {
74 sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
75 user->lmpassword = lm_hash;
76 user->lm_password_present = True;
78 if (keys.keys.keys2.ntpassword.length == 16) {
79 sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
80 user->ntpassword = nt_hash;
81 user->nt_password_present = True;
84 *error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:\n", username);
85 dump_data(10, data.data, data.length);
93 * Decrypt and extract the secrets
95 * The writes decrypted secrets back into the structure
97 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
98 struct creds_CredentialState *creds,
99 enum netr_SamDatabaseID database,
100 struct netr_DELTA_ENUM *delta,
103 struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
104 creds_arcfour_crypt(creds, secret->current_cipher.cipher_data,
105 secret->current_cipher.maxlen);
107 creds_arcfour_crypt(creds, secret->old_cipher.cipher_data,
108 secret->old_cipher.maxlen);
114 * Fix up the delta, dealing with encryption issues so that the final
115 * callback need only do the printing or application logic
118 static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx,
119 struct creds_CredentialState *creds,
120 enum netr_SamDatabaseID database,
121 struct netr_DELTA_ENUM *delta,
124 NTSTATUS nt_status = NT_STATUS_OK;
125 *error_string = NULL;
126 switch (delta->delta_type) {
127 case NETR_DELTA_USER:
129 nt_status = fix_user(mem_ctx,
136 case NETR_DELTA_SECRET:
138 nt_status = fix_secret(mem_ctx,
151 NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
153 NTSTATUS nt_status, dbsync_nt_status;
154 TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
155 struct creds_CredentialState *creds;
156 struct netr_DatabaseSync dbsync;
157 struct cli_credentials *machine_account;
158 struct dcerpc_pipe *p;
159 struct libnet_context *machine_net_ctx;
160 struct libnet_RpcConnect *c;
161 struct libnet_SamSync_state *state;
162 const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
165 samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
167 if (!r->in.machine_account) {
168 machine_account = cli_credentials_init(samsync_ctx);
169 if (!machine_account) {
170 talloc_free(samsync_ctx);
171 return NT_STATUS_NO_MEMORY;
173 cli_credentials_set_conf(machine_account);
174 nt_status = cli_credentials_set_machine_account(machine_account);
175 if (!NT_STATUS_IS_OK(nt_status)) {
176 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
177 talloc_free(samsync_ctx);
181 machine_account = r->in.machine_account;
184 /* We cannot do this unless we are a BDC. Check, before we get odd errors later */
185 if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
187 = talloc_asprintf(mem_ctx,
188 "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
190 cli_credentials_get_domain(machine_account),
191 cli_credentials_get_secure_channel_type(machine_account));
192 talloc_free(samsync_ctx);
193 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
196 c = talloc(samsync_ctx, struct libnet_RpcConnect);
198 r->out.error_string = NULL;
199 talloc_free(samsync_ctx);
200 return NT_STATUS_NO_MEMORY;
203 c->level = LIBNET_RPC_CONNECT_DC_INFO;
204 if (r->in.binding_string) {
205 c->in.binding = r->in.binding_string;
208 c->in.name = cli_credentials_get_domain(machine_account);
211 /* prepare connect to the NETLOGON pipe of PDC */
212 c->in.dcerpc_iface = &dcerpc_table_netlogon;
214 /* We must do this as the machine, not as any command-line
215 * user. So we override the credentials in the
217 machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
218 if (!machine_net_ctx) {
219 r->out.error_string = NULL;
220 talloc_free(samsync_ctx);
221 return NT_STATUS_NO_MEMORY;
223 *machine_net_ctx = *ctx;
224 machine_net_ctx->cred = machine_account;
226 /* connect to the NETLOGON pipe of the PDC */
227 nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
228 if (!NT_STATUS_IS_OK(nt_status)) {
229 if (r->in.binding_string) {
230 r->out.error_string = talloc_asprintf(mem_ctx,
231 "Connection to NETLOGON pipe of DC %s failed: %s",
232 r->in.binding_string, c->out.error_string);
234 r->out.error_string = talloc_asprintf(mem_ctx,
235 "Connection to NETLOGON pipe of DC for %s failed: %s",
236 c->in.name, c->out.error_string);
238 talloc_free(samsync_ctx);
242 /* This makes a new pipe, on which we can do schannel. We
243 * should do this in the RpcConnect code, but the abstaction
244 * layers do not suit yet */
246 nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
247 c->out.dcerpc_pipe->binding);
249 if (!NT_STATUS_IS_OK(nt_status)) {
250 r->out.error_string = talloc_asprintf(mem_ctx,
251 "Secondary connection to NETLOGON pipe of DC %s failed: %s",
252 dcerpc_server_name(p), nt_errstr(nt_status));
253 talloc_free(samsync_ctx);
257 nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &dcerpc_table_netlogon,
258 machine_account, DCERPC_AUTH_LEVEL_PRIVACY);
260 if (!NT_STATUS_IS_OK(nt_status)) {
261 r->out.error_string = talloc_asprintf(mem_ctx,
262 "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
263 dcerpc_server_name(p), nt_errstr(nt_status));
264 talloc_free(samsync_ctx);
268 state = talloc(samsync_ctx, struct libnet_SamSync_state);
270 r->out.error_string = NULL;
271 talloc_free(samsync_ctx);
275 state->domain_name = c->out.domain_name;
276 state->domain_sid = c->out.domain_sid;
277 state->realm = c->out.realm;
278 state->domain_guid = c->out.guid;
279 state->machine_net_ctx = machine_net_ctx;
280 state->netlogon_pipe = p;
282 /* initialise the callback layer. It may wish to contact the
283 * server with ldap, now we know the name */
287 nt_status = r->in.init_fn(samsync_ctx,
291 if (!NT_STATUS_IS_OK(nt_status)) {
292 r->out.error_string = talloc_steal(mem_ctx, error_string);
293 talloc_free(samsync_ctx);
298 /* get NETLOGON credentails */
300 nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
301 if (!NT_STATUS_IS_OK(nt_status)) {
302 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
303 talloc_free(samsync_ctx);
307 /* Setup details for the synchronisation */
308 dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
309 dbsync.in.computername = cli_credentials_get_workstation(machine_account);
310 dbsync.in.preferredmaximumlength = (uint32_t)-1;
311 ZERO_STRUCT(dbsync.in.return_authenticator);
313 for (i=0;i< ARRAY_SIZE(database_ids); i++) {
314 dbsync.in.sync_context = 0;
315 dbsync.in.database_id = database_ids[i];
319 loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
320 creds_client_authenticator(creds, &dbsync.in.credential);
322 dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
323 if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
324 !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
325 r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
326 talloc_free(samsync_ctx);
330 if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
331 r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
332 talloc_free(samsync_ctx);
333 return NT_STATUS_ACCESS_DENIED;
336 dbsync.in.sync_context = dbsync.out.sync_context;
338 /* For every single remote 'delta' entry: */
339 for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
340 char *error_string = NULL;
341 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
342 /* 'Fix' elements, by decrypting and
343 * de-obfuscating the data */
344 nt_status = fix_delta(delta_ctx,
346 dbsync.in.database_id,
347 &dbsync.out.delta_enum_array->delta_enum[d],
349 if (!NT_STATUS_IS_OK(nt_status)) {
350 r->out.error_string = talloc_steal(mem_ctx, error_string);
351 talloc_free(samsync_ctx);
355 /* Now call the callback. This will
356 * do something like print the data or
358 nt_status = r->in.delta_fn(delta_ctx,
360 dbsync.in.database_id,
361 &dbsync.out.delta_enum_array->delta_enum[d],
363 if (!NT_STATUS_IS_OK(nt_status)) {
364 r->out.error_string = talloc_steal(mem_ctx, error_string);
365 talloc_free(samsync_ctx);
368 talloc_free(delta_ctx);
370 talloc_free(loop_ctx);
371 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
373 if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
374 r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
375 talloc_free(samsync_ctx);
376 return dbsync_nt_status;
378 nt_status = NT_STATUS_OK;
380 talloc_free(samsync_ctx);