source: branches/samba-3.5.x/source4/auth/credentials/credentials_files.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 13.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 User credentials handling (as regards on-disk files)
5
6 Copyright (C) Jelmer Vernooij 2005
7 Copyright (C) Tim Potter 2001
8 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22*/
23
24#include "includes.h"
25#include "lib/events/events.h"
26#include "lib/ldb/include/ldb.h"
27#include "librpc/gen_ndr/samr.h" /* for struct samrPassword */
28#include "param/secrets.h"
29#include "system/filesys.h"
30#include "../lib/util/util_ldb.h"
31#include "auth/credentials/credentials.h"
32#include "auth/credentials/credentials_krb5.h"
33#include "auth/credentials/credentials_proto.h"
34#include "param/param.h"
35#include "lib/events/events.h"
36
37/**
38 * Read a file descriptor, and parse it for a password (eg from a file or stdin)
39 *
40 * @param credentials Credentials structure on which to set the password
41 * @param fd open file descriptor to read the password from
42 * @param obtained This enum describes how 'specified' this password is
43 */
44
45_PUBLIC_ bool cli_credentials_parse_password_fd(struct cli_credentials *credentials,
46 int fd, enum credentials_obtained obtained)
47{
48 char *p;
49 char pass[128];
50
51 for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
52 p && p - pass < sizeof(pass);) {
53 switch (read(fd, p, 1)) {
54 case 1:
55 if (*p != '\n' && *p != '\0') {
56 *++p = '\0'; /* advance p, and null-terminate pass */
57 break;
58 }
59 /* fall through */
60 case 0:
61 if (p - pass) {
62 *p = '\0'; /* null-terminate it, just in case... */
63 p = NULL; /* then force the loop condition to become false */
64 break;
65 } else {
66 fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
67 return false;
68 }
69
70 default:
71 fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
72 fd, strerror(errno));
73 return false;
74 }
75 }
76
77 cli_credentials_set_password(credentials, pass, obtained);
78 return true;
79}
80
81/**
82 * Read a named file, and parse it for a password
83 *
84 * @param credentials Credentials structure on which to set the password
85 * @param file a named file to read the password from
86 * @param obtained This enum describes how 'specified' this password is
87 */
88
89_PUBLIC_ bool cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
90{
91 int fd = open(file, O_RDONLY, 0);
92 bool ret;
93
94 if (fd < 0) {
95 fprintf(stderr, "Error opening password file %s: %s\n",
96 file, strerror(errno));
97 return false;
98 }
99
100 ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
101
102 close(fd);
103
104 return ret;
105}
106
107/**
108 * Read a named file, and parse it for username, domain, realm and password
109 *
110 * @param credentials Credentials structure on which to set the password
111 * @param file a named file to read the details from
112 * @param obtained This enum describes how 'specified' this password is
113 */
114
115_PUBLIC_ bool cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
116{
117 uint16_t len = 0;
118 char *ptr, *val, *param;
119 char **lines;
120 int i, numlines;
121
122 lines = file_lines_load(file, &numlines, 0, NULL);
123
124 if (lines == NULL)
125 {
126 /* fail if we can't open the credentials file */
127 d_printf("ERROR: Unable to open credentials file!\n");
128 return false;
129 }
130
131 for (i = 0; i < numlines; i++) {
132 len = strlen(lines[i]);
133
134 if (len == 0)
135 continue;
136
137 /* break up the line into parameter & value.
138 * will need to eat a little whitespace possibly */
139 param = lines[i];
140 if (!(ptr = strchr_m (lines[i], '=')))
141 continue;
142
143 val = ptr+1;
144 *ptr = '\0';
145
146 /* eat leading white space */
147 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
148 val++;
149
150 if (strwicmp("password", param) == 0) {
151 cli_credentials_set_password(cred, val, obtained);
152 } else if (strwicmp("username", param) == 0) {
153 cli_credentials_set_username(cred, val, obtained);
154 } else if (strwicmp("domain", param) == 0) {
155 cli_credentials_set_domain(cred, val, obtained);
156 } else if (strwicmp("realm", param) == 0) {
157 cli_credentials_set_realm(cred, val, obtained);
158 }
159 memset(lines[i], 0, len);
160 }
161
162 talloc_free(lines);
163
164 return true;
165}
166
167
168/**
169 * Fill in credentials for the machine trust account, from the secrets database.
170 *
171 * @param cred Credentials structure to fill in
172 * @retval NTSTATUS error detailing any failure
173 */
174_PUBLIC_ NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred,
175 struct tevent_context *event_ctx,
176 struct loadparm_context *lp_ctx,
177 struct ldb_context *ldb,
178 const char *base,
179 const char *filter)
180{
181 TALLOC_CTX *mem_ctx;
182
183 int ldb_ret;
184 struct ldb_message **msgs;
185 const char *attrs[] = {
186 "secret",
187 "priorSecret",
188 "samAccountName",
189 "flatname",
190 "realm",
191 "secureChannelType",
192 "unicodePwd",
193 "msDS-KeyVersionNumber",
194 "saltPrincipal",
195 "privateKeytab",
196 "krb5Keytab",
197 "servicePrincipalName",
198 "ldapBindDn",
199 NULL
200 };
201
202 const char *machine_account;
203 const char *password;
204 const char *old_password;
205 const char *domain;
206 const char *realm;
207 enum netr_SchannelType sct;
208 const char *salt_principal;
209 const char *keytab;
210
211 /* ok, we are going to get it now, don't recurse back here */
212 cred->machine_account_pending = false;
213
214 /* some other parts of the system will key off this */
215 cred->machine_account = true;
216
217 mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
218
219 if (!ldb) {
220 /* Local secrets are stored in secrets.ldb */
221 ldb = secrets_db_connect(mem_ctx, event_ctx, lp_ctx);
222 if (!ldb) {
223 /* set anonymous as the fallback, if the machine account won't work */
224 cli_credentials_set_anonymous(cred);
225 DEBUG(1, ("Could not open secrets.ldb\n"));
226 talloc_free(mem_ctx);
227 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
228 }
229 }
230
231 /* search for the secret record */
232 ldb_ret = gendb_search(ldb,
233 mem_ctx, ldb_dn_new(mem_ctx, ldb, base),
234 &msgs, attrs,
235 "%s", filter);
236 if (ldb_ret == 0) {
237 DEBUG(5, ("(normal if no LDAP backend required) Could not find entry to match filter: '%s' base: '%s'\n",
238 filter, base));
239 /* set anonymous as the fallback, if the machine account won't work */
240 cli_credentials_set_anonymous(cred);
241 talloc_free(mem_ctx);
242 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
243 } else if (ldb_ret != 1) {
244 DEBUG(5, ("Found more than one (%d) entry to match filter: '%s' base: '%s'\n",
245 ldb_ret, filter, base));
246 /* set anonymous as the fallback, if the machine account won't work */
247 cli_credentials_set_anonymous(cred);
248 talloc_free(mem_ctx);
249 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
250 }
251
252 password = ldb_msg_find_attr_as_string(msgs[0], "secret", NULL);
253 old_password = ldb_msg_find_attr_as_string(msgs[0], "priorSecret", NULL);
254
255 machine_account = ldb_msg_find_attr_as_string(msgs[0], "samAccountName", NULL);
256
257 if (!machine_account) {
258 machine_account = ldb_msg_find_attr_as_string(msgs[0], "servicePrincipalName", NULL);
259
260 if (!machine_account) {
261 const char *ldap_bind_dn = ldb_msg_find_attr_as_string(msgs[0], "ldapBindDn", NULL);
262 if (!ldap_bind_dn) {
263 DEBUG(1, ("Could not find 'samAccountName', 'servicePrincipalName' or 'ldapBindDn' in secrets record: filter: '%s' base: '%s'\n",
264 filter, base));
265 /* set anonymous as the fallback, if the machine account won't work */
266 cli_credentials_set_anonymous(cred);
267 talloc_free(mem_ctx);
268 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
269 }
270 }
271 }
272
273 salt_principal = ldb_msg_find_attr_as_string(msgs[0], "saltPrincipal", NULL);
274 cli_credentials_set_salt_principal(cred, salt_principal);
275
276 sct = ldb_msg_find_attr_as_int(msgs[0], "secureChannelType", 0);
277 if (sct) {
278 cli_credentials_set_secure_channel_type(cred, sct);
279 }
280
281 if (!password) {
282 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "unicodePwd");
283 struct samr_Password hash;
284 ZERO_STRUCT(hash);
285 if (nt_password_hash) {
286 memcpy(hash.hash, nt_password_hash->data,
287 MIN(nt_password_hash->length, sizeof(hash.hash)));
288
289 cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
290 } else {
291 cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
292 }
293 } else {
294 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
295 }
296
297
298 domain = ldb_msg_find_attr_as_string(msgs[0], "flatname", NULL);
299 if (domain) {
300 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
301 }
302
303 realm = ldb_msg_find_attr_as_string(msgs[0], "realm", NULL);
304 if (realm) {
305 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
306 }
307
308 if (machine_account) {
309 cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
310 }
311
312 cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msgs[0], "msDS-KeyVersionNumber", 0));
313
314 /* If there was an external keytab specified by reference in
315 * the LDB, then use this. Otherwise we will make one up
316 * (chewing CPU time) from the password */
317 keytab = ldb_msg_find_attr_as_string(msgs[0], "krb5Keytab", NULL);
318 if (keytab) {
319 cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED);
320 } else {
321 keytab = ldb_msg_find_attr_as_string(msgs[0], "privateKeytab", NULL);
322 if (keytab) {
323 keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, lp_ctx, keytab));
324 if (keytab) {
325 cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED);
326 }
327 }
328 }
329 talloc_free(mem_ctx);
330
331 return NT_STATUS_OK;
332}
333
334/**
335 * Fill in credentials for the machine trust account, from the secrets database.
336 *
337 * @param cred Credentials structure to fill in
338 * @retval NTSTATUS error detailing any failure
339 */
340_PUBLIC_ NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred,
341 struct loadparm_context *lp_ctx)
342{
343 NTSTATUS status;
344 char *filter;
345 /* Bleh, nasty recursion issues: We are setting a machine
346 * account here, so we don't want the 'pending' flag around
347 * any more */
348 cred->machine_account_pending = false;
349 filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER,
350 cli_credentials_get_domain(cred));
351 status = cli_credentials_set_secrets(cred, event_context_find(cred), lp_ctx, NULL,
352 SECRETS_PRIMARY_DOMAIN_DN,
353 filter);
354 if (!NT_STATUS_IS_OK(status)) {
355 DEBUG(1, ("Could not find machine account in secrets database: %s", nt_errstr(status)));
356 }
357 return status;
358}
359
360/**
361 * Fill in credentials for the machine trust account, from the secrets database.
362 *
363 * @param cred Credentials structure to fill in
364 * @retval NTSTATUS error detailing any failure
365 */
366NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred,
367 struct tevent_context *event_ctx,
368 struct loadparm_context *lp_ctx)
369{
370 NTSTATUS status;
371 char *filter;
372 /* Bleh, nasty recursion issues: We are setting a machine
373 * account here, so we don't want the 'pending' flag around
374 * any more */
375 cred->machine_account_pending = false;
376 filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
377 cli_credentials_get_realm(cred),
378 cli_credentials_get_domain(cred));
379 status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL,
380 SECRETS_PRINCIPALS_DN,
381 filter);
382 if (!NT_STATUS_IS_OK(status)) {
383 DEBUG(1, ("Could not find krbtgt (master Kerberos) account in secrets database: %s", nt_errstr(status)));
384 }
385 return status;
386}
387
388/**
389 * Fill in credentials for a particular prinicpal, from the secrets database.
390 *
391 * @param cred Credentials structure to fill in
392 * @retval NTSTATUS error detailing any failure
393 */
394_PUBLIC_ NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
395 struct tevent_context *event_ctx,
396 struct loadparm_context *lp_ctx,
397 const char *serviceprincipal)
398{
399 NTSTATUS status;
400 char *filter;
401 /* Bleh, nasty recursion issues: We are setting a machine
402 * account here, so we don't want the 'pending' flag around
403 * any more */
404 cred->machine_account_pending = false;
405 filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
406 cli_credentials_get_realm(cred),
407 cli_credentials_get_domain(cred),
408 serviceprincipal);
409 status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL,
410 SECRETS_PRINCIPALS_DN, filter);
411 if (!NT_STATUS_IS_OK(status)) {
412 DEBUG(1, ("Could not find %s principal in secrets database: %s", serviceprincipal, nt_errstr(status)));
413 }
414 return status;
415}
416
417/**
418 * Ask that when required, the credentials system will be filled with
419 * machine trust account, from the secrets database.
420 *
421 * @param cred Credentials structure to fill in
422 * @note This function is used to call the above function after, rather
423 * than during, popt processing.
424 *
425 */
426_PUBLIC_ void cli_credentials_set_machine_account_pending(struct cli_credentials *cred,
427 struct loadparm_context *lp_ctx)
428{
429 cred->machine_account_pending = true;
430 cred->machine_account_pending_lp_ctx = lp_ctx;
431}
432
433
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