← Back to branch summary

~zulcss/samba/samab-3.4-test

« back to all changes in this revision

Viewing changes to source4/libnet/libnet_samsync.c

  • Committer: Chuck Short
  • Date: 2010-05-20 18:57:13 UTC
  • Revision ID: zulcss@ubuntu.com-20100520185713-hwqvf9t50z830wck
Initial commit

Show diffs side-by-side

added added

removed removed

Lines of Context:
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 netr_Authenticator credential, return_authenticator;
 
173
        struct netr_DELTA_ENUM_ARRAY *delta_enum_array = NULL;
 
174
        struct cli_credentials *machine_account;
 
175
        struct dcerpc_pipe *p;
 
176
        struct libnet_context *machine_net_ctx;
 
177
        struct libnet_RpcConnect *c;
 
178
        struct libnet_SamSync_state *state;
 
179
        const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS}; 
 
180
        int i;
 
181
 
 
182
        samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");
 
183
 
 
184
        if (!r->in.machine_account) { 
 
185
                machine_account = cli_credentials_init(samsync_ctx);
 
186
                if (!machine_account) {
 
187
                        talloc_free(samsync_ctx);
 
188
                        return NT_STATUS_NO_MEMORY;
 
189
                }
 
190
                cli_credentials_set_conf(machine_account, ctx->lp_ctx);
 
191
                nt_status = cli_credentials_set_machine_account(machine_account, ctx->lp_ctx);
 
192
                if (!NT_STATUS_IS_OK(nt_status)) {
 
193
                        r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
 
194
                        talloc_free(samsync_ctx);
 
195
                        return nt_status;
 
196
                }
 
197
        } else {
 
198
                machine_account = r->in.machine_account;
 
199
        }
 
200
 
 
201
        /* We cannot do this unless we are a BDC.  Check, before we get odd errors later */
 
202
        if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
 
203
                r->out.error_string
 
204
                        = talloc_asprintf(mem_ctx, 
 
205
                                          "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
 
206
                                          cli_credentials_get_domain(machine_account),
 
207
                                          cli_credentials_get_secure_channel_type(machine_account));
 
208
                talloc_free(samsync_ctx);
 
209
                return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 
210
        }
 
211
 
 
212
        c = talloc(samsync_ctx, struct libnet_RpcConnect);
 
213
        if (!c) {
 
214
                r->out.error_string = NULL;
 
215
                talloc_free(samsync_ctx);
 
216
                return NT_STATUS_NO_MEMORY;
 
217
        }
 
218
 
 
219
        c->level              = LIBNET_RPC_CONNECT_DC_INFO;
 
220
        if (r->in.binding_string) {
 
221
                c->in.binding = r->in.binding_string;
 
222
                c->in.name    = NULL;
 
223
        } else {
 
224
                c->in.binding = NULL;
 
225
                c->in.name    = cli_credentials_get_domain(machine_account);
 
226
        }
 
227
        
 
228
        /* prepare connect to the NETLOGON pipe of PDC */
 
229
        c->in.dcerpc_iface      = &ndr_table_netlogon;
 
230
 
 
231
        /* We must do this as the machine, not as any command-line
 
232
         * user.  So we override the credentials in the
 
233
         * libnet_context */
 
234
        machine_net_ctx = talloc(samsync_ctx, struct libnet_context);
 
235
        if (!machine_net_ctx) {
 
236
                r->out.error_string = NULL;
 
237
                talloc_free(samsync_ctx);
 
238
                return NT_STATUS_NO_MEMORY;
 
239
        }
 
240
        *machine_net_ctx = *ctx;
 
241
        machine_net_ctx->cred = machine_account;
 
242
 
 
243
        /* connect to the NETLOGON pipe of the PDC */
 
244
        nt_status = libnet_RpcConnect(machine_net_ctx, samsync_ctx, c);
 
245
        if (!NT_STATUS_IS_OK(nt_status)) {
 
246
                if (r->in.binding_string) {
 
247
                        r->out.error_string = talloc_asprintf(mem_ctx,
 
248
                                                              "Connection to NETLOGON pipe of DC %s failed: %s",
 
249
                                                              r->in.binding_string, c->out.error_string);
 
250
                } else {
 
251
                        r->out.error_string = talloc_asprintf(mem_ctx,
 
252
                                                              "Connection to NETLOGON pipe of DC for %s failed: %s",
 
253
                                                              c->in.name, c->out.error_string);
 
254
                }
 
255
                talloc_free(samsync_ctx);
 
256
                return nt_status;
 
257
        }
 
258
 
 
259
        /* This makes a new pipe, on which we can do schannel.  We
 
260
         * should do this in the RpcConnect code, but the abstaction
 
261
         * layers do not suit yet */
 
262
 
 
263
        nt_status = dcerpc_secondary_connection(c->out.dcerpc_pipe, &p,
 
264
                                                c->out.dcerpc_pipe->binding);
 
265
 
 
266
        if (!NT_STATUS_IS_OK(nt_status)) {
 
267
                r->out.error_string = talloc_asprintf(mem_ctx,
 
268
                                                      "Secondary connection to NETLOGON pipe of DC %s failed: %s",
 
269
                                                      dcerpc_server_name(p), nt_errstr(nt_status));
 
270
                talloc_free(samsync_ctx);
 
271
                return nt_status;
 
272
        }
 
273
 
 
274
        nt_status = dcerpc_bind_auth_schannel(samsync_ctx, p, &ndr_table_netlogon,
 
275
                                              machine_account, ctx->lp_ctx, DCERPC_AUTH_LEVEL_PRIVACY);
 
276
 
 
277
        if (!NT_STATUS_IS_OK(nt_status)) {
 
278
                r->out.error_string = talloc_asprintf(mem_ctx,
 
279
                                                      "SCHANNEL authentication to NETLOGON pipe of DC %s failed: %s",
 
280
                                                      dcerpc_server_name(p), nt_errstr(nt_status));
 
281
                talloc_free(samsync_ctx);
 
282
                return nt_status;
 
283
        }
 
284
 
 
285
        state = talloc(samsync_ctx, struct libnet_SamSync_state);
 
286
        if (!state) {
 
287
                r->out.error_string = NULL;
 
288
                talloc_free(samsync_ctx);
 
289
                return nt_status;
 
290
        }               
 
291
 
 
292
        state->domain_name     = c->out.domain_name;
 
293
        state->domain_sid      = c->out.domain_sid;
 
294
        state->realm           = c->out.realm;
 
295
        state->domain_guid     = c->out.guid;
 
296
        state->machine_net_ctx = machine_net_ctx;
 
297
        state->netlogon_pipe   = p;
 
298
 
 
299
        /* initialise the callback layer.  It may wish to contact the
 
300
         * server with ldap, now we know the name */
 
301
        
 
302
        if (r->in.init_fn) {
 
303
                char *error_string;
 
304
                nt_status = r->in.init_fn(samsync_ctx, 
 
305
                                          r->in.fn_ctx,
 
306
                                          state, 
 
307
                                          &error_string); 
 
308
                if (!NT_STATUS_IS_OK(nt_status)) {
 
309
                        r->out.error_string = talloc_steal(mem_ctx, error_string);
 
310
                        talloc_free(samsync_ctx);
 
311
                        return nt_status;
 
312
                }
 
313
        }
 
314
 
 
315
        /* get NETLOGON credentials */
 
316
 
 
317
        nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
 
318
        if (!NT_STATUS_IS_OK(nt_status)) {
 
319
                r->out.error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
 
320
                talloc_free(samsync_ctx);
 
321
                return nt_status;
 
322
        }
 
323
 
 
324
        /* Setup details for the synchronisation */
 
325
 
 
326
        ZERO_STRUCT(return_authenticator);
 
327
 
 
328
        dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
 
329
        dbsync.in.computername = cli_credentials_get_workstation(machine_account);
 
330
        dbsync.in.preferredmaximumlength = (uint32_t)-1;
 
331
        dbsync.in.return_authenticator = &return_authenticator;
 
332
        dbsync.out.return_authenticator = &return_authenticator;
 
333
        dbsync.out.delta_enum_array = &delta_enum_array;
 
334
 
 
335
        for (i=0;i< ARRAY_SIZE(database_ids); i++) {
 
336
 
 
337
                uint32_t sync_context = 0;
 
338
 
 
339
                dbsync.in.database_id = database_ids[i];
 
340
                dbsync.in.sync_context = &sync_context;
 
341
                dbsync.out.sync_context = &sync_context;
 
342
                
 
343
                do {
 
344
                        int d;
 
345
                        loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
 
346
                        creds_client_authenticator(creds, &credential);
 
347
 
 
348
                        dbsync.in.credential = &credential;
 
349
                        
 
350
                        dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
 
351
                        if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
 
352
                            !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
 
353
                                r->out.error_string = talloc_asprintf(mem_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
 
354
                                talloc_free(samsync_ctx);
 
355
                                return nt_status;
 
356
                        }
 
357
                        
 
358
                        if (!creds_client_check(creds, &dbsync.out.return_authenticator->cred)) {
 
359
                                r->out.error_string = talloc_strdup(mem_ctx, "Credential chaining on incoming DatabaseSync failed");
 
360
                                talloc_free(samsync_ctx);
 
361
                                return NT_STATUS_ACCESS_DENIED;
 
362
                        }
 
363
                        
 
364
                        dbsync.in.sync_context = dbsync.out.sync_context;
 
365
                        
 
366
                        /* For every single remote 'delta' entry: */
 
367
                        for (d=0; d < delta_enum_array->num_deltas; d++) {
 
368
                                char *error_string = NULL;
 
369
                                delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
 
370
                                /* 'Fix' elements, by decrypting and
 
371
                                 * de-obfuscating the data */
 
372
                                nt_status = fix_delta(delta_ctx, 
 
373
                                                      creds, 
 
374
                                                      r->in.rid_crypt,
 
375
                                                      dbsync.in.database_id,
 
376
                                                      &delta_enum_array->delta_enum[d],
 
377
                                                      &error_string);
 
378
                                if (!NT_STATUS_IS_OK(nt_status)) {
 
379
                                        r->out.error_string = talloc_steal(mem_ctx, error_string);
 
380
                                        talloc_free(samsync_ctx);
 
381
                                        return nt_status;
 
382
                                }
 
383
 
 
384
                                /* Now call the callback.  This will
 
385
                                 * do something like print the data or
 
386
                                 * write to an ldb */
 
387
                                nt_status = r->in.delta_fn(delta_ctx, 
 
388
                                                           r->in.fn_ctx,
 
389
                                                           dbsync.in.database_id,
 
390
                                                           &delta_enum_array->delta_enum[d],
 
391
                                                           &error_string);
 
392
                                if (!NT_STATUS_IS_OK(nt_status)) {
 
393
                                        r->out.error_string = talloc_steal(mem_ctx, error_string);
 
394
                                        talloc_free(samsync_ctx);
 
395
                                        return nt_status;
 
396
                                }
 
397
                                talloc_free(delta_ctx);
 
398
                        }
 
399
                        talloc_free(loop_ctx);
 
400
                } while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
 
401
                
 
402
                if (!NT_STATUS_IS_OK(dbsync_nt_status)) {
 
403
                        r->out.error_string = talloc_asprintf(mem_ctx, "libnet_SamSync_netlogon failed: unexpected inconsistancy. Should not get error %s here", nt_errstr(nt_status));
 
404
                        talloc_free(samsync_ctx);
 
405
                        return dbsync_nt_status;
 
406
                }
 
407
                nt_status = NT_STATUS_OK;
 
408
        }
 
409
        talloc_free(samsync_ctx);
 
410
        return nt_status;
 
411
}
 
412