summaryrefslogtreecommitdiff
path: root/source4/auth/gensec/schannel_state.c
blob: 5b398b299660bf500de23436b0d23ad936751448 (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
/* 
   Unix SMB/CIFS implementation.

   module to store/fetch session keys for the schannel server

   Copyright (C) Andrew Tridgell 2004
   
   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 "system/time.h"
#include "auth/auth.h"
#include "lib/ldb/include/ldb.h"
#include "db_wrap.h"

/*
  connect to the schannel ldb
*/
static struct ldb_context *schannel_db_connect(TALLOC_CTX *mem_ctx)
{
	char *path;
	struct ldb_context *ldb;
	BOOL existed;
	const char *init_ldif = 
		"dn: @ATTRIBUTES\n" \
		"computerName: CASE_INSENSITIVE\n" \
		"flatname: CASE_INSENSITIVE\n";

	path = smbd_tmp_path(mem_ctx, "schannel.ldb");
	if (!path) {
		return NULL;
	}

	existed = file_exists(path);
	
	ldb = ldb_wrap_connect(mem_ctx, path, LDB_FLG_NOSYNC, NULL);
	talloc_free(path);
	if (!ldb) {
		return NULL;
	}
	
	if (!existed) {
		gendb_add_ldif(ldb, init_ldif);
	}

	return ldb;
}

/*
  remember an established session key for a netr server authentication
  use a simple ldb structure
*/
NTSTATUS schannel_store_session_key(TALLOC_CTX *mem_ctx,
				    struct creds_CredentialState *creds)
{
	struct ldb_context *ldb;
	struct ldb_message *msg;
	struct ldb_val val, seed;
	char *f;
	char *sct;
	char *rid;
	int ret;

	ldb = schannel_db_connect(mem_ctx);
	if (ldb == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	f = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->negotiate_flags);

	if (f == NULL) {
		talloc_free(ldb);
		return NT_STATUS_NO_MEMORY;
	}

	sct = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->secure_channel_type);

	if (sct == NULL) {
		talloc_free(ldb);
		return NT_STATUS_NO_MEMORY;
	}

	rid = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->rid);

	if (rid == NULL) {
		talloc_free(ldb);
		return NT_STATUS_NO_MEMORY;
	}

	msg = ldb_msg_new(ldb);
	if (msg == NULL) {
		talloc_free(ldb);
		return NT_STATUS_NO_MEMORY;
	}

	msg->dn = ldb_dn_build_child(msg, "computerName", creds->computer_name, NULL);
	if (msg->dn == NULL) {
		talloc_free(ldb);
		return NT_STATUS_NO_MEMORY;
	}

	val.data = creds->session_key;
	val.length = sizeof(creds->session_key);

	seed.data = creds->seed.data;
	seed.length = sizeof(creds->seed.data);

	ldb_msg_add_string(msg, "objectClass", "schannelState");
	ldb_msg_add_value(msg, "sessionKey", &val);
	ldb_msg_add_value(msg, "seed", &seed);
	ldb_msg_add_string(msg, "negotiateFlags", f);
	ldb_msg_add_string(msg, "secureChannelType", sct);
	ldb_msg_add_string(msg, "accountName", creds->account_name);
	ldb_msg_add_string(msg, "computerName", creds->computer_name);
	ldb_msg_add_string(msg, "flatname", creds->domain);
	ldb_msg_add_string(msg, "rid", rid);

	ldb_delete(ldb, msg->dn);

	ret = ldb_add(ldb, msg);

	if (ret != 0) {
		DEBUG(0,("Unable to add %s to session key db - %s\n", 
			 ldb_dn_linearize(msg, msg->dn), ldb_errstring(ldb)));
		talloc_free(ldb);
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	talloc_free(ldb);

	return NT_STATUS_OK;
}


/*
  read back a credentials back for a computer
*/
NTSTATUS schannel_fetch_session_key(TALLOC_CTX *mem_ctx,
				    const char *computer_name, 
				    const char *domain,
				    struct creds_CredentialState **creds)
{
	struct ldb_context *ldb;
	struct ldb_message **res;
	int ret;
	const struct ldb_val *val;
	char *expr=NULL;

	*creds = talloc_zero(mem_ctx, struct creds_CredentialState);
	if (!*creds) {
		return NT_STATUS_NO_MEMORY;
	}

	ldb = schannel_db_connect(mem_ctx);
	if (ldb == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	expr = talloc_asprintf(mem_ctx, "(&(computerName=%s)(flatname=%s))", computer_name, domain);
	if (expr == NULL) {
		talloc_free(ldb);
		return NT_STATUS_NO_MEMORY;
	}

	ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res);
	if (ret != 1) {
		talloc_free(ldb);
		return NT_STATUS_INVALID_HANDLE;
	}

	val = ldb_msg_find_ldb_val(res[0], "sessionKey");
	if (val == NULL || val->length != 16) {
		DEBUG(1,("schannel: record in schannel DB must contain a sessionKey of length 16, when searching for client: %s\n", computer_name));
		talloc_free(ldb);
		return NT_STATUS_INTERNAL_ERROR;
	}

	memcpy((*creds)->session_key, val->data, 16);

	val = ldb_msg_find_ldb_val(res[0], "seed");
	if (val == NULL || val->length != 8) {
		DEBUG(1,("schannel: record in schannel DB must contain a vaid seed of length 8, when searching for client: %s\n", computer_name));
		talloc_free(ldb);
		return NT_STATUS_INTERNAL_ERROR;
	}

	memcpy((*creds)->seed.data, val->data, 8);

	(*creds)->negotiate_flags = ldb_msg_find_int(res[0], "negotiateFlags", 0);

	(*creds)->secure_channel_type = ldb_msg_find_int(res[0], "secureChannelType", 0);

	(*creds)->account_name = talloc_reference(*creds, ldb_msg_find_string(res[0], "accountName", NULL));

	(*creds)->computer_name = talloc_reference(*creds, ldb_msg_find_string(res[0], "computerName", NULL));

	(*creds)->domain = talloc_reference(*creds, ldb_msg_find_string(res[0], "flatname", NULL));

	(*creds)->rid = ldb_msg_find_uint(res[0], "rid", 0);

	talloc_free(ldb);

	return NT_STATUS_OK;
}