source: branches/samba-3.0/source/libads/cldap.c

Last change on this file was 312, checked in by Herwig Bauernfeind, 16 years ago

Update 3.0 to final 3.0.36 (source)
File size: 8.8 KB
RevLine 
[22]1/*
2 Samba Unix/Linux SMB client library
3 net ads cldap functions
4 Copyright (C) 2001 Andrew Tridgell (tridge@samba.org)
5 Copyright (C) 2003 Jim McDonough (jmcd@us.ibm.com)
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#include "includes.h"
23
24/*
25 These seem to be strings as described in RFC1035 4.1.4 and can be:
26
27 - a sequence of labels ending in a zero octet
28 - a pointer
29 - a sequence of labels ending with a pointer
30
31 A label is a byte where the first two bits must be zero and the remaining
32 bits represent the length of the label followed by the label itself.
33 Therefore, the length of a label is at max 64 bytes. Under RFC1035, a
34 sequence of labels cannot exceed 255 bytes.
35
36 A pointer consists of a 14 bit offset from the beginning of the data.
37
38 struct ptr {
39 unsigned ident:2; // must be 11
40 unsigned offset:14; // from the beginning of data
41 };
42
43 This is used as a method to compress the packet by eliminated duplicate
44 domain components. Since a UDP packet should probably be < 512 bytes and a
45 DNS name can be up to 255 bytes, this actually makes a lot of sense.
46*/
47static unsigned pull_netlogon_string(char *ret, const char *ptr,
48 const char *data)
49{
50 char *pret = ret;
51 int followed_ptr = 0;
52 unsigned ret_len = 0;
53
54 memset(pret, 0, MAX_DNS_LABEL);
55 do {
56 if ((*ptr & 0xc0) == 0xc0) {
57 uint16 len;
58
59 if (!followed_ptr) {
60 ret_len += 2;
61 followed_ptr = 1;
62 }
[312]63 len = ((ptr[0] & 0x3f) << 8) | (uint8) ptr[1];
[22]64 ptr = data + len;
65 } else if (*ptr) {
66 uint8 len = (uint8)*(ptr++);
67
68 if ((pret - ret + len + 1) >= MAX_DNS_LABEL) {
69 DEBUG(1,("DC returning too long DNS name\n"));
70 return 0;
71 }
72
73 if (pret != ret) {
74 *pret = '.';
75 pret++;
76 }
77 memcpy(pret, ptr, len);
78 pret += len;
79 ptr += len;
80
81 if (!followed_ptr) {
82 ret_len += (len + 1);
83 }
84 }
85 } while (*ptr);
86
87 return followed_ptr ? ret_len : ret_len + 1;
88}
89
90/*
91 do a cldap netlogon query
92*/
93static int send_cldap_netlogon(int sock, const char *domain,
94 const char *hostname, unsigned ntversion)
95{
96 ASN1_DATA data;
97 char ntver[4];
98#ifdef CLDAP_USER_QUERY
99 char aac[4];
100
101 SIVAL(aac, 0, 0x00000180);
102#endif
103 SIVAL(ntver, 0, ntversion);
104
105 memset(&data, 0, sizeof(data));
106
107 asn1_push_tag(&data,ASN1_SEQUENCE(0));
108 asn1_write_Integer(&data, 4);
109 asn1_push_tag(&data, ASN1_APPLICATION(3));
110 asn1_write_OctetString(&data, NULL, 0);
111 asn1_write_enumerated(&data, 0);
112 asn1_write_enumerated(&data, 0);
113 asn1_write_Integer(&data, 0);
114 asn1_write_Integer(&data, 0);
115 asn1_write_BOOLEAN2(&data, False);
116 asn1_push_tag(&data, ASN1_CONTEXT(0));
117
118 if (domain) {
119 asn1_push_tag(&data, ASN1_CONTEXT(3));
120 asn1_write_OctetString(&data, "DnsDomain", 9);
121 asn1_write_OctetString(&data, domain, strlen(domain));
122 asn1_pop_tag(&data);
123 }
124
125 asn1_push_tag(&data, ASN1_CONTEXT(3));
126 asn1_write_OctetString(&data, "Host", 4);
127 asn1_write_OctetString(&data, hostname, strlen(hostname));
128 asn1_pop_tag(&data);
129
130#ifdef CLDAP_USER_QUERY
131 asn1_push_tag(&data, ASN1_CONTEXT(3));
132 asn1_write_OctetString(&data, "User", 4);
133 asn1_write_OctetString(&data, "SAMBA$", 6);
134 asn1_pop_tag(&data);
135
136 asn1_push_tag(&data, ASN1_CONTEXT(3));
137 asn1_write_OctetString(&data, "AAC", 4);
138 asn1_write_OctetString(&data, aac, 4);
139 asn1_pop_tag(&data);
140#endif
141
142 asn1_push_tag(&data, ASN1_CONTEXT(3));
143 asn1_write_OctetString(&data, "NtVer", 5);
144 asn1_write_OctetString(&data, ntver, 4);
145 asn1_pop_tag(&data);
146
147 asn1_pop_tag(&data);
148
149 asn1_push_tag(&data,ASN1_SEQUENCE(0));
150 asn1_write_OctetString(&data, "NetLogon", 8);
151 asn1_pop_tag(&data);
152 asn1_pop_tag(&data);
153 asn1_pop_tag(&data);
154
155 if (data.has_error) {
156 DEBUG(2,("Failed to build cldap netlogon at offset %d\n", (int)data.ofs));
157 asn1_free(&data);
158 return -1;
159 }
160
161 if (write(sock, data.data, data.length) != (ssize_t)data.length) {
162 DEBUG(2,("failed to send cldap query (%s)\n", strerror(errno)));
163 asn1_free(&data);
164 return -1;
165 }
166
167 asn1_free(&data);
168
169 return 0;
170}
171
172static SIG_ATOMIC_T gotalarm;
173
174/***************************************************************
175 Signal function to tell us we timed out.
176****************************************************************/
177
178static void gotalarm_sig(void)
179{
180 gotalarm = 1;
181}
182
183/*
184 receive a cldap netlogon reply
185*/
186static int recv_cldap_netlogon(int sock, struct cldap_netlogon_reply *reply)
187{
188 int ret;
189 ASN1_DATA data;
190 DATA_BLOB blob = data_blob(NULL, 0);
191 DATA_BLOB os1 = data_blob(NULL, 0);
192 DATA_BLOB os2 = data_blob(NULL, 0);
193 DATA_BLOB os3 = data_blob(NULL, 0);
194 int i1;
195 /* half the time of a regular ldap timeout, not less than 3 seconds. */
196 unsigned int al_secs = MAX(3,lp_ldap_timeout()/2);
197 char *p;
198
199 blob = data_blob(NULL, 8192);
200 if (blob.data == NULL) {
201 DEBUG(1, ("data_blob failed\n"));
202 errno = ENOMEM;
203 return -1;
204 }
205
206 /* Setup timeout */
207 gotalarm = 0;
208 CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
209 alarm(al_secs);
210 /* End setup timeout. */
211
212 ret = read(sock, blob.data, blob.length);
213
214 /* Teardown timeout. */
215 CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
216 alarm(0);
217
218 if (ret <= 0) {
219 DEBUG(1,("no reply received to cldap netlogon\n"));
220 data_blob_free(&blob);
221 return -1;
222 }
223 blob.length = ret;
224
225 asn1_load(&data, blob);
226 asn1_start_tag(&data, ASN1_SEQUENCE(0));
227 asn1_read_Integer(&data, &i1);
228 asn1_start_tag(&data, ASN1_APPLICATION(4));
229 asn1_read_OctetString(&data, &os1);
230 asn1_start_tag(&data, ASN1_SEQUENCE(0));
231 asn1_start_tag(&data, ASN1_SEQUENCE(0));
232 asn1_read_OctetString(&data, &os2);
233 asn1_start_tag(&data, ASN1_SET);
234 asn1_read_OctetString(&data, &os3);
235 asn1_end_tag(&data);
236 asn1_end_tag(&data);
237 asn1_end_tag(&data);
238 asn1_end_tag(&data);
239 asn1_end_tag(&data);
240
241 if (data.has_error) {
242 data_blob_free(&blob);
243 data_blob_free(&os1);
244 data_blob_free(&os2);
245 data_blob_free(&os3);
246 asn1_free(&data);
247 DEBUG(1,("Failed to parse cldap reply\n"));
248 return -1;
249 }
250
251 p = (char *)os3.data;
252
253 reply->type = IVAL(p, 0); p += 4;
254 reply->flags = IVAL(p, 0); p += 4;
255
256 memcpy(&reply->guid.info, p, UUID_FLAT_SIZE);
257 p += UUID_FLAT_SIZE;
258
259 p += pull_netlogon_string(reply->forest, p, (const char *)os3.data);
260 p += pull_netlogon_string(reply->domain, p, (const char *)os3.data);
261 p += pull_netlogon_string(reply->hostname, p, (const char *)os3.data);
262 p += pull_netlogon_string(reply->netbios_domain, p, (const char *)os3.data);
263 p += pull_netlogon_string(reply->netbios_hostname, p, (const char *)os3.data);
264 p += pull_netlogon_string(reply->unk, p, (const char *)os3.data);
265
266 if (reply->type == SAMLOGON_AD_R) {
267 p += pull_netlogon_string(reply->user_name, p, (const char *)os3.data);
268 } else {
269 *reply->user_name = 0;
270 }
271
272 p += pull_netlogon_string(reply->server_site_name, p, (const char *)os3.data);
273 p += pull_netlogon_string(reply->client_site_name, p, (const char *)os3.data);
274
275 reply->version = IVAL(p, 0);
276 reply->lmnt_token = SVAL(p, 4);
277 reply->lm20_token = SVAL(p, 6);
278
279 data_blob_free(&os1);
280 data_blob_free(&os2);
281 data_blob_free(&os3);
282 data_blob_free(&blob);
283
284 asn1_free(&data);
285
286 return 0;
287}
288
289/*******************************************************************
290 do a cldap netlogon query. Always 389/udp
291*******************************************************************/
292
293BOOL ads_cldap_netlogon(const char *server, const char *realm, struct cldap_netlogon_reply *reply)
294{
295 int sock;
296 int ret;
297
298 sock = open_udp_socket(server, LDAP_PORT );
299 if (sock == -1) {
300 DEBUG(2,("ads_cldap_netlogon: Failed to open udp socket to %s\n",
301 server));
302 return False;
303 }
304
305 ret = send_cldap_netlogon(sock, realm, global_myname(), 6);
306 if (ret != 0) {
307 close(sock);
308 return False;
309 }
310 ret = recv_cldap_netlogon(sock, reply);
311 close(sock);
312
313 if (ret == -1) {
314 return False;
315 }
316
317 return True;
318}
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