2b6bc4f9d6c7f1ea0a0042a0ee1de68f2bf856f8
[kai/samba-autobuild/.git] / source4 / auth / credentials / credentials_files.c
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/ldb/include/ldb.h"
26 #include "librpc/gen_ndr/samr.h" /* for struct samrPassword */
27 #include "param/secrets.h"
28 #include "system/filesys.h"
29 #include "db_wrap.h"
30 #include "auth/credentials/credentials.h"
31 #include "auth/credentials/credentials_krb5.h"
32
33 /**
34  * Read a file descriptor, and parse it for a password (eg from a file or stdin)
35  *
36  * @param credentials Credentials structure on which to set the password
37  * @param fd open file descriptor to read the password from 
38  * @param obtained This enum describes how 'specified' this password is
39  */
40
41 BOOL cli_credentials_parse_password_fd(struct cli_credentials *credentials, 
42                                        int fd, enum credentials_obtained obtained)
43 {
44         char *p;
45         char pass[128];
46
47         for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
48                 p && p - pass < sizeof(pass);) {
49                 switch (read(fd, p, 1)) {
50                 case 1:
51                         if (*p != '\n' && *p != '\0') {
52                                 *++p = '\0'; /* advance p, and null-terminate pass */
53                                 break;
54                         }
55                         /* fall through */
56                 case 0:
57                         if (p - pass) {
58                                 *p = '\0'; /* null-terminate it, just in case... */
59                                 p = NULL; /* then force the loop condition to become false */
60                                 break;
61                         } else {
62                                 fprintf(stderr, "Error reading password from file descriptor %d: %s\n", fd, "empty password\n");
63                                 return False;
64                         }
65
66                 default:
67                         fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
68                                         fd, strerror(errno));
69                         return False;
70                 }
71         }
72
73         cli_credentials_set_password(credentials, pass, obtained);
74         return True;
75 }
76
77 /**
78  * Read a named file, and parse it for a password
79  *
80  * @param credentials Credentials structure on which to set the password
81  * @param file a named file to read the password from 
82  * @param obtained This enum describes how 'specified' this password is
83  */
84
85 BOOL cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
86 {
87         int fd = open(file, O_RDONLY, 0);
88         BOOL ret;
89
90         if (fd < 0) {
91                 fprintf(stderr, "Error opening password file %s: %s\n",
92                                 file, strerror(errno));
93                 return False;
94         }
95
96         ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
97
98         close(fd);
99         
100         return ret;
101 }
102
103 /**
104  * Read a named file, and parse it for username, domain, realm and password
105  *
106  * @param credentials Credentials structure on which to set the password
107  * @param file a named file to read the details from 
108  * @param obtained This enum describes how 'specified' this password is
109  */
110
111 BOOL cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained) 
112 {
113         uint16_t len = 0;
114         char *ptr, *val, *param;
115         char **lines;
116         int i, numlines;
117
118         lines = file_lines_load(file, &numlines, NULL);
119
120         if (lines == NULL)
121         {
122                 /* fail if we can't open the credentials file */
123                 d_printf("ERROR: Unable to open credentials file!\n");
124                 return False;
125         }
126
127         for (i = 0; i < numlines; i++) {
128                 len = strlen(lines[i]);
129
130                 if (len == 0)
131                         continue;
132
133                 /* break up the line into parameter & value.
134                  * will need to eat a little whitespace possibly */
135                 param = lines[i];
136                 if (!(ptr = strchr_m (lines[i], '=')))
137                         continue;
138
139                 val = ptr+1;
140                 *ptr = '\0';
141
142                 /* eat leading white space */
143                 while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
144                         val++;
145
146                 if (strwicmp("password", param) == 0) {
147                         cli_credentials_set_password(cred, val, obtained);
148                 } else if (strwicmp("username", param) == 0) {
149                         cli_credentials_set_username(cred, val, obtained);
150                 } else if (strwicmp("domain", param) == 0) {
151                         cli_credentials_set_domain(cred, val, obtained);
152                 } else if (strwicmp("realm", param) == 0) {
153                         cli_credentials_set_realm(cred, val, obtained);
154                 }
155                 memset(lines[i], 0, len);
156         }
157
158         talloc_free(lines);
159
160         return True;
161 }
162
163
164 /**
165  * Fill in credentials for the machine trust account, from the secrets database.
166  * 
167  * @param cred Credentials structure to fill in
168  * @retval NTSTATUS error detailing any failure
169  */
170 NTSTATUS cli_credentials_set_secrets(struct cli_credentials *cred, 
171                                      struct ldb_context *ldb,
172                                      const char *base,
173                                      const char *filter)
174 {
175         TALLOC_CTX *mem_ctx;
176         
177         int ldb_ret;
178         struct ldb_message **msgs;
179         const char *attrs[] = {
180                 "secret",
181                 "priorSecret",
182                 "samAccountName",
183                 "flatname",
184                 "realm",
185                 "secureChannelType",
186                 "unicodePwd",
187                 "msDS-KeyVersionNumber",
188                 "saltPrincipal",
189                 "privateKeytab",
190                 "krb5Keytab",
191                 "servicePrincipalName",
192                 NULL
193         };
194         
195         const char *machine_account;
196         const char *password;
197         const char *old_password;
198         const char *domain;
199         const char *realm;
200         enum netr_SchannelType sct;
201         const char *salt_principal;
202         const char *keytab;
203         
204         /* ok, we are going to get it now, don't recurse back here */
205         cred->machine_account_pending = False;
206
207         /* some other parts of the system will key off this */
208         cred->machine_account = True;
209
210         mem_ctx = talloc_named(cred, 0, "cli_credentials fetch machine password");
211
212         if (!ldb) {
213                 /* Local secrets are stored in secrets.ldb */
214                 ldb = secrets_db_connect(mem_ctx);
215                 if (!ldb) {
216                         /* set anonymous as the fallback, if the machine account won't work */
217                         cli_credentials_set_anonymous(cred);
218                         DEBUG(1, ("Could not open secrets.ldb\n"));
219                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
220                 }
221         }
222
223         /* search for the secret record */
224         ldb_ret = gendb_search(ldb,
225                                mem_ctx, ldb_dn_new(mem_ctx, ldb, base), 
226                                &msgs, attrs,
227                                "%s", filter);
228         if (ldb_ret == 0) {
229                 DEBUG(1, ("Could not find entry to match filter: '%s' base: '%s'\n",
230                           filter, base));
231                 /* set anonymous as the fallback, if the machine account won't work */
232                 cli_credentials_set_anonymous(cred);
233                 talloc_free(mem_ctx);
234                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
235         } else if (ldb_ret != 1) {
236                 DEBUG(1, ("Found more than one (%d) entry to match filter: '%s' base: '%s'\n",
237                           ldb_ret, filter, base));
238                 /* set anonymous as the fallback, if the machine account won't work */
239                 cli_credentials_set_anonymous(cred);
240                 talloc_free(mem_ctx);
241                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
242         }
243         
244         password = ldb_msg_find_attr_as_string(msgs[0], "secret", NULL);
245         old_password = ldb_msg_find_attr_as_string(msgs[0], "priorSecret", NULL);
246
247         machine_account = ldb_msg_find_attr_as_string(msgs[0], "samAccountName", NULL);
248
249         if (!machine_account) {
250                 machine_account = ldb_msg_find_attr_as_string(msgs[0], "servicePrincipalName", NULL);
251                 
252                 if (!machine_account) {
253                         DEBUG(1, ("Could not find 'samAccountName' in join record to domain: %s: filter: '%s' base: '%s'\n",
254                                   cli_credentials_get_domain(cred), filter, base));
255                         /* set anonymous as the fallback, if the machine account won't work */
256                         cli_credentials_set_anonymous(cred);
257                         talloc_free(mem_ctx);
258                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
259                 }
260         }
261
262         salt_principal = ldb_msg_find_attr_as_string(msgs[0], "saltPrincipal", NULL);
263         cli_credentials_set_salt_principal(cred, salt_principal);
264         
265         sct = ldb_msg_find_attr_as_int(msgs[0], "secureChannelType", 0);
266         if (sct) { 
267                 cli_credentials_set_secure_channel_type(cred, sct);
268         }
269         
270         if (!password) {
271                 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "unicodePwd");
272                 struct samr_Password hash;
273                 ZERO_STRUCT(hash);
274                 if (nt_password_hash) {
275                         memcpy(hash.hash, nt_password_hash->data, 
276                                MIN(nt_password_hash->length, sizeof(hash.hash)));
277                 
278                         cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
279                 } else {
280                         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
281                 }
282         } else {
283                 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
284         }
285
286         
287         domain = ldb_msg_find_attr_as_string(msgs[0], "flatname", NULL);
288         if (domain) {
289                 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
290         }
291
292         realm = ldb_msg_find_attr_as_string(msgs[0], "realm", NULL);
293         if (realm) {
294                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
295         }
296
297         cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
298
299         cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msgs[0], "msDS-KeyVersionNumber", 0));
300
301         /* If there was an external keytab specified by reference in
302          * the LDB, then use this.  Otherwise we will make one up
303          * (chewing CPU time) from the password */
304         keytab = ldb_msg_find_attr_as_string(msgs[0], "krb5Keytab", NULL);
305         if (keytab) {
306                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
307         } else {
308                 keytab = ldb_msg_find_attr_as_string(msgs[0], "privateKeytab", NULL);
309                 if (keytab) {
310                         keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, keytab));
311                         if (keytab) {
312                                 cli_credentials_set_keytab_name(cred, keytab, CRED_SPECIFIED);
313                         }
314                 }
315         }
316         talloc_free(mem_ctx);
317         
318         return NT_STATUS_OK;
319 }
320
321 /**
322  * Fill in credentials for the machine trust account, from the secrets database.
323  * 
324  * @param cred Credentials structure to fill in
325  * @retval NTSTATUS error detailing any failure
326  */
327 NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred)
328 {
329         char *filter;
330         /* Bleh, nasty recursion issues: We are setting a machine
331          * account here, so we don't want the 'pending' flag around
332          * any more */
333         cred->machine_account_pending = False;
334         filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER, 
335                                        cli_credentials_get_domain(cred));
336         return cli_credentials_set_secrets(cred, NULL, SECRETS_PRIMARY_DOMAIN_DN,
337                                            filter);
338 }
339
340 /**
341  * Fill in credentials for the machine trust account, from the secrets database.
342  * 
343  * @param cred Credentials structure to fill in
344  * @retval NTSTATUS error detailing any failure
345  */
346 NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred)
347 {
348         char *filter;
349         /* Bleh, nasty recursion issues: We are setting a machine
350          * account here, so we don't want the 'pending' flag around
351          * any more */
352         cred->machine_account_pending = False;
353         filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
354                                        cli_credentials_get_realm(cred),
355                                        cli_credentials_get_domain(cred));
356         return cli_credentials_set_secrets(cred, NULL, SECRETS_PRINCIPALS_DN,
357                                            filter);
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  */
366 NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
367                                               const char *serviceprincipal)
368 {
369         char *filter;
370         /* Bleh, nasty recursion issues: We are setting a machine
371          * account here, so we don't want the 'pending' flag around
372          * any more */
373         cred->machine_account_pending = False;
374         filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
375                                  cli_credentials_get_realm(cred),
376                                  cli_credentials_get_domain(cred),
377                                  serviceprincipal);
378         return cli_credentials_set_secrets(cred, NULL, SECRETS_PRINCIPALS_DN,
379                                            filter);
380 }
381
382 /**
383  * Ask that when required, the credentials system will be filled with
384  * machine trust account, from the secrets database.
385  * 
386  * @param cred Credentials structure to fill in
387  * @note This function is used to call the above function after, rather 
388  *       than during, popt processing.
389  *
390  */
391 void cli_credentials_set_machine_account_pending(struct cli_credentials *cred)
392 {
393         cred->machine_account_pending = True;
394 }
395
396