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
|
/*
Samba Unix/Linux SMB client library
net ads cldap functions
Copyright (C) 2001 Andrew Tridgell (tridge@samba.org)
Copyright (C) 2003 Jim McDonough (jmcd@us.ibm.com)
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
/*
do a cldap netlogon query
*/
static int send_cldap_netlogon(int sock, const char *domain,
const char *hostname, unsigned ntversion)
{
ASN1_DATA data;
char ntver[4];
#ifdef CLDAP_USER_QUERY
char aac[4];
SIVAL(aac, 0, 0x00000180);
#endif
SIVAL(ntver, 0, ntversion);
memset(&data, 0, sizeof(data));
asn1_push_tag(&data,ASN1_SEQUENCE(0));
asn1_write_Integer(&data, 4);
asn1_push_tag(&data, ASN1_APPLICATION(3));
asn1_write_OctetString(&data, NULL, 0);
asn1_write_enumerated(&data, 0);
asn1_write_enumerated(&data, 0);
asn1_write_Integer(&data, 0);
asn1_write_Integer(&data, 0);
asn1_write_BOOLEAN2(&data, False);
asn1_push_tag(&data, ASN1_CONTEXT(0));
if (domain) {
asn1_push_tag(&data, ASN1_CONTEXT(3));
asn1_write_OctetString(&data, "DnsDomain", 9);
asn1_write_OctetString(&data, domain, strlen(domain));
asn1_pop_tag(&data);
}
asn1_push_tag(&data, ASN1_CONTEXT(3));
asn1_write_OctetString(&data, "Host", 4);
asn1_write_OctetString(&data, hostname, strlen(hostname));
asn1_pop_tag(&data);
#ifdef CLDAP_USER_QUERY
asn1_push_tag(&data, ASN1_CONTEXT(3));
asn1_write_OctetString(&data, "User", 4);
asn1_write_OctetString(&data, "SAMBA$", 6);
asn1_pop_tag(&data);
asn1_push_tag(&data, ASN1_CONTEXT(3));
asn1_write_OctetString(&data, "AAC", 4);
asn1_write_OctetString(&data, aac, 4);
asn1_pop_tag(&data);
#endif
asn1_push_tag(&data, ASN1_CONTEXT(3));
asn1_write_OctetString(&data, "NtVer", 5);
asn1_write_OctetString(&data, ntver, 4);
asn1_pop_tag(&data);
asn1_pop_tag(&data);
asn1_push_tag(&data,ASN1_SEQUENCE(0));
asn1_write_OctetString(&data, "NetLogon", 8);
asn1_pop_tag(&data);
asn1_pop_tag(&data);
asn1_pop_tag(&data);
if (data.has_error) {
DEBUG(2,("Failed to build cldap netlogon at offset %d\n", (int)data.ofs));
asn1_free(&data);
return -1;
}
if (write(sock, data.data, data.length) != (ssize_t)data.length) {
DEBUG(2,("failed to send cldap query (%s)\n", strerror(errno)));
asn1_free(&data);
return -1;
}
asn1_free(&data);
return 0;
}
static SIG_ATOMIC_T gotalarm;
/***************************************************************
Signal function to tell us we timed out.
****************************************************************/
static void gotalarm_sig(void)
{
gotalarm = 1;
}
/*
receive a cldap netlogon reply
*/
static int recv_cldap_netlogon(TALLOC_CTX *mem_ctx,
int sock,
struct nbt_cldap_netlogon_5 *reply)
{
int ret;
ASN1_DATA data;
DATA_BLOB blob = data_blob_null;
DATA_BLOB os1 = data_blob_null;
DATA_BLOB os2 = data_blob_null;
DATA_BLOB os3 = data_blob_null;
int i1;
/* half the time of a regular ldap timeout, not less than 3 seconds. */
unsigned int al_secs = MAX(3,lp_ldap_timeout()/2);
union nbt_cldap_netlogon p;
enum ndr_err_code ndr_err;
blob = data_blob(NULL, 8192);
if (blob.data == NULL) {
DEBUG(1, ("data_blob failed\n"));
errno = ENOMEM;
return -1;
}
/* Setup timeout */
gotalarm = 0;
CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
alarm(al_secs);
/* End setup timeout. */
ret = read(sock, blob.data, blob.length);
/* Teardown timeout. */
CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
alarm(0);
if (ret <= 0) {
DEBUG(1,("no reply received to cldap netlogon\n"));
data_blob_free(&blob);
return -1;
}
blob.length = ret;
asn1_load(&data, blob);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_read_Integer(&data, &i1);
asn1_start_tag(&data, ASN1_APPLICATION(4));
asn1_read_OctetString(&data, &os1);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_read_OctetString(&data, &os2);
asn1_start_tag(&data, ASN1_SET);
asn1_read_OctetString(&data, &os3);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
if (data.has_error) {
data_blob_free(&blob);
data_blob_free(&os1);
data_blob_free(&os2);
data_blob_free(&os3);
asn1_free(&data);
DEBUG(1,("Failed to parse cldap reply\n"));
return -1;
}
ndr_err = ndr_pull_union_blob_all(&os3, mem_ctx, &p, 5,
(ndr_pull_flags_fn_t)ndr_pull_nbt_cldap_netlogon);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
return -1;
}
*reply = p.logon5;
if (DEBUGLEVEL >= 10) {
NDR_PRINT_UNION_DEBUG(nbt_cldap_netlogon, 5, &p);
}
data_blob_free(&os1);
data_blob_free(&os2);
data_blob_free(&os3);
data_blob_free(&blob);
asn1_free(&data);
return 0;
}
/*******************************************************************
do a cldap netlogon query. Always 389/udp
*******************************************************************/
bool ads_cldap_netlogon(TALLOC_CTX *mem_ctx,
const char *server,
const char *realm,
struct nbt_cldap_netlogon_5 *reply)
{
int sock;
int ret;
sock = open_udp_socket(server, LDAP_PORT );
if (sock == -1) {
DEBUG(2,("ads_cldap_netlogon: Failed to open udp socket to %s\n",
server));
return False;
}
ret = send_cldap_netlogon(sock, realm, global_myname(), 6);
if (ret != 0) {
close(sock);
return False;
}
ret = recv_cldap_netlogon(mem_ctx, sock, reply);
close(sock);
if (ret == -1) {
return False;
}
return True;
}
|
