0f82d98673831fbacfcec1646fe9a92647ff7930
[ira/wip.git] / source4 / libnet / libnet_samsync.c
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 "auth/gensec/gensec.h"
27 #include "auth/credentials/credentials.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"
31 #include "param/param.h"
32
33
34 /**
35  * Decrypt and extract the user's passwords.  
36  * 
37  * The writes decrypted (no longer 'RID encrypted' or arcfour encrypted) passwords back into the structure
38  */
39 static NTSTATUS fix_user(TALLOC_CTX *mem_ctx,
40                          struct creds_CredentialState *creds,
41                          bool rid_crypt,
42                          enum netr_SamDatabaseID database,
43                          struct netr_DELTA_ENUM *delta,
44                          char **error_string) 
45 {
46
47         uint32_t rid = delta->delta_id_union.rid;
48         struct netr_DELTA_USER *user = delta->delta_union.user;
49         struct samr_Password lm_hash;
50         struct samr_Password nt_hash;
51         const char *username = user->account_name.string;
52
53         if (rid_crypt) {
54                 if (user->lm_password_present) {
55                         sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
56                         user->lmpassword = lm_hash;
57                 }
58                 
59                 if (user->nt_password_present) {
60                         sam_rid_crypt(rid, user->ntpassword.hash, nt_hash.hash, 0);
61                         user->ntpassword = nt_hash;
62                 }
63         }
64
65         if (user->user_private_info.SensitiveData) {
66                 DATA_BLOB data;
67                 struct netr_USER_KEYS keys;
68                 enum ndr_err_code ndr_err;
69                 data.data = user->user_private_info.SensitiveData;
70                 data.length = user->user_private_info.DataLength;
71                 creds_arcfour_crypt(creds, data.data, data.length);
72                 user->user_private_info.SensitiveData = data.data;
73                 user->user_private_info.DataLength = data.length;
74
75                 ndr_err = ndr_pull_struct_blob(&data, mem_ctx, NULL, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
76                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
77                         *error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:", username);
78                         dump_data(10, data.data, data.length);
79                         return ndr_map_error2ntstatus(ndr_err);
80                 }
81
82                 if (keys.keys.keys2.lmpassword.length == 16) {
83                         if (rid_crypt) {
84                                 sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
85                                 user->lmpassword = lm_hash;
86                         } else {
87                                 user->lmpassword = keys.keys.keys2.lmpassword.pwd;
88                         }
89                         user->lm_password_present = true;
90                 }
91                 if (keys.keys.keys2.ntpassword.length == 16) {
92                         if (rid_crypt) {
93                                 sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
94                                 user->ntpassword = nt_hash;
95                         } else {
96                                 user->ntpassword = keys.keys.keys2.ntpassword.pwd;
97                         }
98                         user->nt_password_present = true;
99                 }
100                 /* TODO: rid decrypt history fields */
101         }
102         return NT_STATUS_OK;
103 }
104
105 /**
106  * Decrypt and extract the secrets
107  * 
108  * The writes decrypted secrets back into the structure
109  */
110 static NTSTATUS fix_secret(TALLOC_CTX *mem_ctx,
111                            struct creds_CredentialState *creds,
112                            enum netr_SamDatabaseID database,
113                            struct netr_DELTA_ENUM *delta,
114                            char **error_string) 
115 {
116         struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
117         creds_arcfour_crypt(creds, secret->current_cipher.cipher_data, 
118                             secret->current_cipher.maxlen); 
119
120         creds_arcfour_crypt(creds, secret->old_cipher.cipher_data, 
121                             secret->old_cipher.maxlen); 
122
123         return NT_STATUS_OK;
124 }
125
126 /**
127  * Fix up the delta, dealing with encryption issues so that the final
128  * callback need only do the printing or application logic
129  */
130
131 static NTSTATUS fix_delta(TALLOC_CTX *mem_ctx,          
132                           struct creds_CredentialState *creds,
133                           bool rid_crypt,
134                           enum netr_SamDatabaseID database,
135                           struct netr_DELTA_ENUM *delta,
136                           char **error_string)
137 {
138         NTSTATUS nt_status = NT_STATUS_OK;
139         *error_string = NULL;
140         switch (delta->delta_type) {
141         case NETR_DELTA_USER:
142         {
143                 nt_status = fix_user(mem_ctx, 
144                                      creds,
145                                      rid_crypt,
146                                      database,
147                                      delta,
148                                      error_string);
149                 break;
150         }
151         case NETR_DELTA_SECRET:
152         {
153                 nt_status = fix_secret(mem_ctx, 
154                                        creds,
155                                        database,
156                                        delta,
157                                        error_string);
158                 break;
159         }
160         default:
161                 break;
162         }
163         return nt_status;
164 }
165
166 NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
167 {
168         NTSTATUS nt_status, dbsync_nt_status;
169         TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
170         struct creds_CredentialState *creds;
171         struct netr_DatabaseSync dbsync;
172         struct cli_credentials *machine_account;
173         struct dcerpc_pipe *p;
174         struct libnet_context *machine_net_ctx;
175         struct libnet_RpcConnect *c;
176         struct libnet_SamSync_state *state;
177         const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS}; 
178         int i;
179
180         samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
181
182         if (!r->in.machine_account) { 
183                 machine_account = cli_credentials_init(samsync_ctx);
184                 if (!machine_account) {
185                         talloc_free(samsync_ctx);
186                         return NT_STATUS_NO_MEMORY;
187                 }
188                 cli_credentials_set_conf(machine_account, ctx->lp_ctx);
189                 nt_status = cli_credentials_set_machine_account(machine_account, ctx->lp_ctx);
190                 if (!NT_STATUS_IS_OK(nt_status)) {
191                         r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
192                         talloc_free(samsync_ctx);
193                         return nt_status;
194                 }
195         } else {
196                 machine_account = r->in.machine_account;
197         }
198
199         /* We cannot do this unless we are a BDC.  Check, before we get odd errors later */
200         if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
201                 r->out.error_string
202                         = talloc_asprintf(mem_ctx, 
203                                           "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
204                                           cli_credentials_get_domain(machine_account),
205                                           cli_credentials_get_secure_channel_type(machine_account));
206                 talloc_free(samsync_ctx);
207                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
208         }
209
210         c = talloc(samsync_ctx, struct libnet_RpcConnect);
211         if (!c) {
212                 r->out.error_string = NULL;
213                 talloc_free(samsync_ctx);
214                 return NT_STATUS_NO_MEMORY;
215         }
216
217         c->level              = LIBNET_RPC_CONNECT_DC_INFO;
218         if (r->in.binding_string) {
219                 c->in.binding = r->in.binding_string;
220                 c->in.name    = NULL;
221         } else {
222                 c->in.binding = NULL;
223                 c->in.name    = cli_credentials_get_domain(machine_account);
224         }
225         
226         /* prepare connect to the NETLOGON pipe of PDC */
227         c->in.dcerpc_iface      = &ndr_table_netlogon;
228
229         /* We must do this as the machine, not as any command-line
230          * user.  So we override the credentials in the
231          * libnet_context */
232         machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
233         if (!machine_net_ctx) {
234                 r->out.error_string = NULL;
235                 talloc_free(samsync_ctx);
236                 return NT_STATUS_NO_MEMORY;
237         }
238         *machine_net_ctx = *ctx;
239         machine_net_ctx->cred = machine_account;
240
241         /* connect to the NETLOGON pipe of the PDC */
242         nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
243         if (!NT_STATUS_IS_OK(nt_status)) {
244                 if (r->in.binding_string) {
245                         r->out.error_string = talloc_asprintf(mem_ctx,
246                                                               "Connection to NETLOGON pipe of DC %s failed: %s",
247                                                               r->in.binding_string, c->out.error_string);
248                 } else {
249                         r->out.error_string = talloc_asprintf(mem_ctx,
250                                                               "Connection to NETLOGON pipe of DC for %s failed: %s",
251                                                               c->in.name, c->out.error_string);
252                 }
253                 talloc_free(samsync_ctx);
254                 return nt_status;
255         }
256
257         /* This makes a new pipe, on which we can do schannel.  We
258          * should do this in the RpcConnect code, but the abstaction
259          * layers do not suit yet */
260
261         nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
262                                                 c->out.dcerpc_pipe->binding);
263
264         if (!NT_STATUS_IS_OK(nt_status)) {
265                 r->out.error_string = talloc_asprintf(mem_ctx,
266                                                       "Secondary connection to NETLOGON pipe of DC %s failed: %s",
267                                                       dcerpc_server_name(p), nt_errstr(nt_status));
268                 talloc_free(samsync_ctx);
269                 return nt_status;
270         }
271
272         nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &ndr_table_netlogon,
273                                               machine_account, ctx->lp_ctx, DCERPC_AUTH_LEVEL_PRIVACY);
274
275         if (!NT_STATUS_IS_OK(nt_status)) {
276                 r->out.error_string = talloc_asprintf(mem_ctx,
277                                                       "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
278                                                       dcerpc_server_name(p), nt_errstr(nt_status));
279                 talloc_free(samsync_ctx);
280                 return nt_status;
281         }
282
283         state = talloc(samsync_ctx, struct libnet_SamSync_state);
284         if (!state) {
285                 r->out.error_string = NULL;
286                 talloc_free(samsync_ctx);
287                 return nt_status;
288         }               
289
290         state->domain_name     = c->out.domain_name;
291         state->domain_sid      = c->out.domain_sid;
292         state->realm           = c->out.realm;
293         state->domain_guid     = c->out.guid;
294         state->machine_net_ctx = machine_net_ctx;
295         state->netlogon_pipe   = p;
296
297         /* initialise the callback layer.  It may wish to contact the
298          * server with ldap, now we know the name */
299         
300         if (r->in.init_fn) {
301                 char *error_string;
302                 nt_status = r->in.init_fn(samsync_ctx, 
303                                           r->in.fn_ctx,
304                                           state, 
305                                           &error_string); 
306                 if (!NT_STATUS_IS_OK(nt_status)) {
307                         r->out.error_string = talloc_steal(mem_ctx, error_string);
308                         talloc_free(samsync_ctx);
309                         return nt_status;
310                 }
311         }
312
313         /* get NETLOGON credentials */
314
315         nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
316         if (!NT_STATUS_IS_OK(nt_status)) {
317                 r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
318                 talloc_free(samsync_ctx);
319                 return nt_status;
320         }
321
322         /* Setup details for the synchronisation */
323         dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
324         dbsync.in.computername = cli_credentials_get_workstation(machine_account);
325         dbsync.in.preferredmaximumlength = (uint32_t)-1;
326         ZERO_STRUCT(dbsync.in.return_authenticator);
327
328         for (i=0;i< ARRAY_SIZE(database_ids); i++) { 
329                 dbsync.in.sync_context = 0;
330                 dbsync.in.database_id = database_ids[i]; 
331                 
332                 do {
333                         int d;
334                         loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
335                         creds_client_authenticator(creds, &dbsync.in.credential);
336                         
337                         dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
338                         if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
339                             !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
340                                 r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
341                                 talloc_free(samsync_ctx);
342                                 return nt_status;
343                         }
344                         
345                         if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
346                                 r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
347                                 talloc_free(samsync_ctx);
348                                 return NT_STATUS_ACCESS_DENIED;
349                         }
350                         
351                         dbsync.in.sync_context = dbsync.out.sync_context;
352                         
353                         /* For every single remote 'delta' entry: */
354                         for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
355                                 char *error_string = NULL;
356                                 delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
357                                 /* 'Fix' elements, by decrypting and
358                                  * de-obfuscating the data */
359                                 nt_status = fix_delta(delta_ctx, 
360                                                       creds, 
361                                                       r->in.rid_crypt,
362                                                       dbsync.in.database_id,
363                                                       &dbsync.out.delta_enum_array->delta_enum[d], 
364                                                       &error_string);
365                                 if (!NT_STATUS_IS_OK(nt_status)) {
366                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
367                                         talloc_free(samsync_ctx);
368                                         return nt_status;
369                                 }
370
371                                 /* Now call the callback.  This will
372                                  * do something like print the data or
373                                  * write to an ldb */
374                                 nt_status = r->in.delta_fn(delta_ctx, 
375                                                            r->in.fn_ctx,
376                                                            dbsync.in.database_id,
377                                                            &dbsync.out.delta_enum_array->delta_enum[d], 
378                                                            &error_string);
379                                 if (!NT_STATUS_IS_OK(nt_status)) {
380                                         r->out.error_string = talloc_steal(mem_ctx, error_string);
381                                         talloc_free(samsync_ctx);
382                                         return nt_status;
383                                 }
384                                 talloc_free(delta_ctx);
385                         }
386                         talloc_free(loop_ctx);
387                 } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
388                 
389                 if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
390                         r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
391                         talloc_free(samsync_ctx);
392                         return dbsync_nt_status;
393                 }
394                 nt_status = NT_STATUS_OK;
395         }
396         talloc_free(samsync_ctx);
397         return nt_status;
398 }
399