summaryrefslogtreecommitdiff
path: root/source4/libnet/libnet_vampire.c
blob: f4be5013f1c0861880b33bbcdf024454562fae83 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/* 
   Unix SMB/CIFS implementation.
   
   Extract the user/system database from a remote SamSync server

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#include "includes.h"
#include "libnet/libnet.h"
#include "librpc/gen_ndr/ndr_netlogon.h"
#include "librpc/gen_ndr/ndr_samr.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,
			 struct creds_CredentialState *creds,
			 enum netr_SamDatabaseID database,
			 struct netr_DELTA_ENUM *delta,
			 char **error_string) 
{

	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;
	NTSTATUS nt_status;

	if (user->lm_password_present) {
		sam_rid_crypt(rid, user->lmpassword.hash, lm_hash.hash, 0);
		user->lmpassword = lm_hash;
	}

	if (user->nt_password_present) {
		sam_rid_crypt(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;
		data.data = user->user_private_info.SensitiveData;
		data.length = user->user_private_info.DataLength;
		creds_arcfour_crypt(creds, data.data, data.length);
		user->user_private_info.SensitiveData = data.data;
		user->user_private_info.DataLength = data.length;

		nt_status = ndr_pull_struct_blob(&data, mem_ctx, &keys, (ndr_pull_flags_fn_t)ndr_pull_netr_USER_KEYS);
		if (NT_STATUS_IS_OK(nt_status)) {
			if (keys.keys.keys2.lmpassword.length == 16) {
				sam_rid_crypt(rid, keys.keys.keys2.lmpassword.pwd.hash, lm_hash.hash, 0);
				user->lmpassword = lm_hash;
				user->lm_password_present = True;
			}
			if (keys.keys.keys2.ntpassword.length == 16) {
				sam_rid_crypt(rid, keys.keys.keys2.ntpassword.pwd.hash, nt_hash.hash, 0);
				user->ntpassword = nt_hash;
				user->nt_password_present = True;
			}
		} else {
			*error_string = talloc_asprintf(mem_ctx, "Failed to parse Sensitive Data for %s:\n", username);
			dump_data(10, data.data, data.length);
			return nt_status;
		}
	}
	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,
			   struct creds_CredentialState *creds,
			   enum netr_SamDatabaseID database,
			   struct netr_DELTA_ENUM *delta,
			   char **error_string) 
{
	struct netr_DELTA_SECRET *secret = delta->delta_union.secret;
	creds_arcfour_crypt(creds, secret->current_cipher.cipher_data, 
			    secret->current_cipher.maxlen); 

	creds_arcfour_crypt(creds, secret->old_cipher.cipher_data, 
			    secret->old_cipher.maxlen); 

	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 fix_delta(TALLOC_CTX *mem_ctx, 		
			  struct creds_CredentialState *creds,
			  enum netr_SamDatabaseID database,
			  struct netr_DELTA_ENUM *delta,
			  char **error_string)
{
	NTSTATUS nt_status = NT_STATUS_OK;
	*error_string = NULL;
	switch (delta->delta_type) {
	case NETR_DELTA_USER:
	{
		nt_status = fix_user(mem_ctx, 
				     creds,
				     database,
				     delta,
				     error_string);
		break;
	}
	case NETR_DELTA_SECRET:
	{
		nt_status = fix_secret(mem_ctx, 
				       creds,
				       database,
				       delta,
				       error_string);
		break;
	}
	default:
		break;
	}
	return nt_status;
}

NTSTATUS libnet_SamSync_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamSync *r)
{
	NTSTATUS nt_status, dbsync_nt_status;
	TALLOC_CTX *samsync_ctx, *loop_ctx, *delta_ctx;
	struct creds_CredentialState *creds;
	struct netr_DatabaseSync dbsync;
	struct cli_credentials *machine_account;
	struct dcerpc_binding *b;
	struct dcerpc_pipe *p;
	const enum netr_SamDatabaseID database_ids[] = {SAM_DATABASE_DOMAIN, SAM_DATABASE_BUILTIN, SAM_DATABASE_PRIVS}; 
	int i;

	/* TODO: This is bogus */
	const char **bindings = lp_passwordserver();
	const char *binding;

	if (bindings && bindings[0]) {
		binding = bindings[0];
	}

	samsync_ctx = talloc_named(mem_ctx, 0, "SamSync top context");

	if (!r->machine_account) { 
		machine_account = cli_credentials_init(samsync_ctx);
		if (!machine_account) {
			talloc_free(samsync_ctx);
			return NT_STATUS_NO_MEMORY;
		}
		cli_credentials_set_conf(machine_account);
		nt_status = cli_credentials_set_machine_account(machine_account);
		if (!NT_STATUS_IS_OK(nt_status)) {
			r->error_string = talloc_strdup(mem_ctx, "Could not obtain machine account password - are we joined to the domain?");
			talloc_free(samsync_ctx);
			return nt_status;
		}
	} else {
		machine_account = r->machine_account;
	}

	if (cli_credentials_get_secure_channel_type(machine_account) != SEC_CHAN_BDC) {
		r->error_string
			= talloc_asprintf(mem_ctx, 
					  "Our join to domain %s is not as a BDC (%d), please rejoin as a BDC",
					  
					  cli_credentials_get_domain(machine_account),
					  cli_credentials_get_secure_channel_type(machine_account));
		talloc_free(samsync_ctx);
		return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
	}

	/* Connect to DC (take a binding string for now) */

	nt_status = dcerpc_parse_binding(samsync_ctx, binding, &b);
	if (!NT_STATUS_IS_OK(nt_status)) {
		r->error_string = talloc_asprintf(mem_ctx, "Bad binding string %s\n", binding);
		talloc_free(samsync_ctx);
		return NT_STATUS_INVALID_PARAMETER;
	}

	/* We like schannel */
	b->flags &= ~DCERPC_AUTH_OPTIONS;
	b->flags |= DCERPC_SCHANNEL | DCERPC_SEAL /* | DCERPC_SCHANNEL_128 */;

	/* Setup schannel */
	nt_status = dcerpc_pipe_connect_b(samsync_ctx, &p, b, 
					  DCERPC_NETLOGON_UUID,
					  DCERPC_NETLOGON_VERSION,
					  machine_account, ctx->event_ctx);

	if (!NT_STATUS_IS_OK(nt_status)) {
		talloc_free(samsync_ctx);
		return nt_status;
	}

	/* get NETLOGON credentails */

	nt_status = dcerpc_schannel_creds(p->conn->security_state.generic_state, samsync_ctx, &creds);
	if (!NT_STATUS_IS_OK(nt_status)) {
		r->error_string = talloc_strdup(mem_ctx, "Could not obtain NETLOGON credentials from DCERPC/GENSEC layer");
		talloc_free(samsync_ctx);
		return nt_status;
	}

	dbsync.in.logon_server = talloc_asprintf(samsync_ctx, "\\\\%s", dcerpc_server_name(p));
	dbsync.in.computername = cli_credentials_get_workstation(machine_account);
	dbsync.in.preferredmaximumlength = (uint32_t)-1;
	ZERO_STRUCT(dbsync.in.return_authenticator);

	for (i=0;i< ARRAY_SIZE(database_ids); i++) { 
		dbsync.in.sync_context = 0;
		dbsync.in.database_id = database_ids[i]; 
		
		do {
			int d;
			loop_ctx = talloc_named(samsync_ctx, 0, "DatabaseSync loop context");
			creds_client_authenticator(creds, &dbsync.in.credential);
			
			dbsync_nt_status = dcerpc_netr_DatabaseSync(p, loop_ctx, &dbsync);
			if (!NT_STATUS_IS_OK(dbsync_nt_status) &&
			    !NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES)) {
				r->error_string = talloc_asprintf(samsync_ctx, "DatabaseSync failed - %s", nt_errstr(nt_status));
				talloc_free(samsync_ctx);
				return nt_status;
			}
			
			if (!creds_client_check(creds, &dbsync.out.return_authenticator.cred)) {
				r->error_string = talloc_strdup(samsync_ctx, "Credential chaining failed");
				talloc_free(samsync_ctx);
				return NT_STATUS_ACCESS_DENIED;
			}
			
			dbsync.in.sync_context = dbsync.out.sync_context;
			
			for (d=0; d < dbsync.out.delta_enum_array->num_deltas; d++) {
				char *error_string = NULL;
				delta_ctx = talloc_named(loop_ctx, 0, "DatabaseSync delta context");
				nt_status = fix_delta(delta_ctx, 
						      creds, 
						      dbsync.in.database_id,
						      &dbsync.out.delta_enum_array->delta_enum[d], 
						      &error_string);
				if (!NT_STATUS_IS_OK(nt_status)) {
					r->error_string = talloc_steal(samsync_ctx, error_string);
					talloc_free(samsync_ctx);
					return nt_status;
				}
				nt_status = r->delta_fn(delta_ctx, 
								 r->fn_ctx,
								 creds,
								 dbsync.in.database_id,
								 &dbsync.out.delta_enum_array->delta_enum[d], 
								 &error_string);
				if (!NT_STATUS_IS_OK(nt_status)) {
					r->error_string = talloc_steal(samsync_ctx, error_string);
					talloc_free(samsync_ctx);
					return nt_status;
				}
				talloc_free(delta_ctx);
			}
			talloc_free(loop_ctx);
		} while (NT_STATUS_EQUAL(dbsync_nt_status, STATUS_MORE_ENTRIES));
		nt_status = dbsync_nt_status;
	}
	talloc_free(samsync_ctx);
	return nt_status;
}