source: vendor/current/source4/libnet/libnet_samsync.c@ 740

Last change on this file since 740 was 740, checked in by Silvan Scherrer, 12 years ago

Samba Server: update vendor to 3.6.0
File size: 9.8 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Extract the user/system database from a remote SamSync server
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
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
23#include "includes.h"
24#include "libnet/libnet.h"
25#include "libcli/auth/libcli_auth.h"
26#include "../libcli/samsync/samsync.h"
27#include "auth/gensec/gensec.h"
28#include "auth/credentials/credentials.h"
29#include "libcli/auth/schannel.h"
30#include "librpc/gen_ndr/ndr_netlogon.h"
31#include "librpc/gen_ndr/ndr_netlogon_c.h"
32#include "param/param.h"
33
34NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
35{
36 NTSTATUS nt_status, dbsync_nt_status;
37 TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
38 struct netlogon_creds_CredentialState *creds;
39 struct netr_DatabaseSync dbsync;
40 struct netr_Authenticator credential, return_authenticator;
41 struct netr_DELTA_ENUM_ARRAY *delta_enum_array = NULL;
42 struct cli_credentials *machine_account;
43 struct dcerpc_pipe *p;
44 struct libnet_context *machine_net_ctx;
45 struct libnet_RpcConnect *c;
46 struct libnet_SamSync_state *state;
47 const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS};
48 unsigned int i;
49
50 samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
51
52 if (!r->in.machine_account) {
53 machine_account = cli_credentials_init(samsync_ctx);
54 if (!machine_account) {
55 talloc_free(samsync_ctx);
56 return NT_STATUS_NO_MEMORY;
57 }
58 cli_credentials_set_conf(machine_account, ctx->lp_ctx);
59 nt_status = cli_credentials_set_machine_account(machine_account, ctx->lp_ctx);
60 if (!NT_STATUS_IS_OK(nt_status)) {
61 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
62 talloc_free(samsync_ctx);
63 return nt_status;
64 }
65 } else {
66 machine_account = r->in.machine_account;
67 }
68
69 /* We cannot do this unless we are a BDC. Check, before we get odd errors later */
70 if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
71 r->out.error_string
72 = talloc_asprintf(mem_ctx,
73 "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
74 cli_credentials_get_domain(machine_account),
75 cli_credentials_get_secure_channel_type(machine_account));
76 talloc_free(samsync_ctx);
77 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
78 }
79
80 c = talloc_zero(samsync_ctx, struct libnet_RpcConnect);
81 if (!c) {
82 r->out.error_string = NULL;
83 talloc_free(samsync_ctx);
84 return NT_STATUS_NO_MEMORY;
85 }
86
87 c->level = LIBNET_RPC_CONNECT_DC_INFO;
88 if (r->in.binding_string) {
89 c->in.binding = r->in.binding_string;
90 c->in.name = NULL;
91 } else {
92 c->in.binding = NULL;
93 c->in.name = cli_credentials_get_domain(machine_account);
94 }
95
96 /* prepare connect to the NETLOGON pipe of PDC */
97 c->in.dcerpc_iface = &ndr_table_netlogon;
98
99 /* We must do this as the machine, not as any command-line
100 * user. So we override the credentials in the
101 * libnet_context */
102 machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
103 if (!machine_net_ctx) {
104 r->out.error_string = NULL;
105 talloc_free(samsync_ctx);
106 return NT_STATUS_NO_MEMORY;
107 }
108 *machine_net_ctx = *ctx;
109 machine_net_ctx->cred = machine_account;
110
111 /* connect to the NETLOGON pipe of the PDC */
112 nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
113 if (!NT_STATUS_IS_OK(nt_status)) {
114 if (r->in.binding_string) {
115 r->out.error_string = talloc_asprintf(mem_ctx,
116 "Connection to NETLOGON pipe of DC %s failed: %s",
117 r->in.binding_string, c->out.error_string);
118 } else {
119 r->out.error_string = talloc_asprintf(mem_ctx,
120 "Connection to NETLOGON pipe of DC for %s failed: %s",
121 c->in.name, c->out.error_string);
122 }
123 talloc_free(samsync_ctx);
124 return nt_status;
125 }
126
127 /* This makes a new pipe, on which we can do schannel. We
128 * should do this in the RpcConnect code, but the abstaction
129 * layers do not suit yet */
130
131 nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
132 c->out.dcerpc_pipe->binding);
133
134 if (!NT_STATUS_IS_OK(nt_status)) {
135 r->out.error_string = talloc_asprintf(mem_ctx,
136 "Secondary connection to NETLOGON pipe of DC %s failed: %s",
137 dcerpc_server_name(p), nt_errstr(nt_status));
138 talloc_free(samsync_ctx);
139 return nt_status;
140 }
141
142 nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &ndr_table_netlogon,
143 machine_account, ctx->lp_ctx, DCERPC_AUTH_LEVEL_PRIVACY);
144
145 if (!NT_STATUS_IS_OK(nt_status)) {
146 r->out.error_string = talloc_asprintf(mem_ctx,
147 "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
148 dcerpc_server_name(p), nt_errstr(nt_status));
149 talloc_free(samsync_ctx);
150 return nt_status;
151 }
152
153 state = talloc(samsync_ctx, struct libnet_SamSync_state);
154 if (!state) {
155 r->out.error_string = NULL;
156 talloc_free(samsync_ctx);
157 return nt_status;
158 }
159
160 state->domain_name = c->out.domain_name;
161 state->domain_sid = c->out.domain_sid;
162 state->realm = c->out.realm;
163 state->domain_guid = c->out.guid;
164 state->machine_net_ctx = machine_net_ctx;
165 state->netlogon_pipe = p;
166
167 /* initialise the callback layer. It may wish to contact the
168 * server with ldap, now we know the name */
169
170 if (r->in.init_fn) {
171 char *error_string;
172 nt_status = r->in.init_fn(samsync_ctx,
173 r->in.fn_ctx,
174 state,
175 &error_string);
176 if (!NT_STATUS_IS_OK(nt_status)) {
177 r->out.error_string = talloc_steal(mem_ctx, error_string);
178 talloc_free(samsync_ctx);
179 return nt_status;
180 }
181 }
182
183 /* get NETLOGON credentials */
184
185 nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
186 if (!NT_STATUS_IS_OK(nt_status)) {
187 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
188 talloc_free(samsync_ctx);
189 return nt_status;
190 }
191
192 /* Setup details for the synchronisation */
193
194 ZERO_STRUCT(return_authenticator);
195
196 dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
197 dbsync.in.computername = cli_credentials_get_workstation(machine_account);
198 dbsync.in.preferredmaximumlength = (uint32_t)-1;
199 dbsync.in.return_authenticator = &return_authenticator;
200 dbsync.out.return_authenticator = &return_authenticator;
201 dbsync.out.delta_enum_array = &delta_enum_array;
202
203 for (i=0;i< ARRAY_SIZE(database_ids); i++) {
204
205 uint32_t sync_context = 0;
206
207 dbsync.in.database_id = database_ids[i];
208 dbsync.in.sync_context = &sync_context;
209 dbsync.out.sync_context = &sync_context;
210
211 do {
212 uint32_t d;
213 loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
214 netlogon_creds_client_authenticator(creds, &credential);
215
216 dbsync.in.credential = &credential;
217
218 dbsync_nt_status = dcerpc_netr_DatabaseSync_r(p->binding_handle, loop_ctx, &dbsync);
219 if (NT_STATUS_IS_OK(dbsync_nt_status) && !NT_STATUS_IS_OK(dbsync.out.result)) {
220 dbsync_nt_status = dbsync.out.result;
221 }
222 if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
223 !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
224 r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
225 talloc_free(samsync_ctx);
226 return nt_status;
227 }
228
229 if (!netlogon_creds_client_check(creds, &dbsync.out.return_authenticator->cred)) {
230 r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
231 talloc_free(samsync_ctx);
232 return NT_STATUS_ACCESS_DENIED;
233 }
234
235 dbsync.in.sync_context = dbsync.out.sync_context;
236
237 /* For every single remote 'delta' entry: */
238 for (d=0; d < delta_enum_array->num_deltas; d++) {
239 char *error_string = NULL;
240 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
241 /* 'Fix' elements, by decrypting and
242 * de-obfuscating the data */
243 nt_status = samsync_fix_delta(delta_ctx,
244 creds,
245 dbsync.in.database_id,
246 &delta_enum_array->delta_enum[d]);
247 if (!NT_STATUS_IS_OK(nt_status)) {
248 r->out.error_string = talloc_steal(mem_ctx, error_string);
249 talloc_free(samsync_ctx);
250 return nt_status;
251 }
252
253 /* Now call the callback. This will
254 * do something like print the data or
255 * write to an ldb */
256 nt_status = r->in.delta_fn(delta_ctx,
257 r->in.fn_ctx,
258 dbsync.in.database_id,
259 &delta_enum_array->delta_enum[d],
260 &error_string);
261 if (!NT_STATUS_IS_OK(nt_status)) {
262 r->out.error_string = talloc_steal(mem_ctx, error_string);
263 talloc_free(samsync_ctx);
264 return nt_status;
265 }
266 talloc_free(delta_ctx);
267 }
268 talloc_free(loop_ctx);
269 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
270
271 if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
272 r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
273 talloc_free(samsync_ctx);
274 return dbsync_nt_status;
275 }
276 nt_status = NT_STATUS_OK;
277 }
278 talloc_free(samsync_ctx);
279 return nt_status;
280}
281
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