s4:auth - fixed problem reading bind DN from secrets database
[ira/wip.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/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                         } else {
270                                 /* store bind dn in credentials */
271                                 cli_credentials_set_bind_dn(cred, ldap_bind_dn);
272                         }
273                 }
274         }
275
276         salt_principal = ldb_msg_find_attr_as_string(msgs[0], "saltPrincipal", NULL);
277         cli_credentials_set_salt_principal(cred, salt_principal);
278         
279         sct = ldb_msg_find_attr_as_int(msgs[0], "secureChannelType", 0);
280         if (sct) { 
281                 cli_credentials_set_secure_channel_type(cred, sct);
282         }
283         
284         if (!password) {
285                 const struct ldb_val *nt_password_hash = ldb_msg_find_ldb_val(msgs[0], "unicodePwd");
286                 struct samr_Password hash;
287                 ZERO_STRUCT(hash);
288                 if (nt_password_hash) {
289                         memcpy(hash.hash, nt_password_hash->data, 
290                                MIN(nt_password_hash->length, sizeof(hash.hash)));
291                 
292                         cli_credentials_set_nt_hash(cred, &hash, CRED_SPECIFIED);
293                 } else {
294                         cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
295                 }
296         } else {
297                 cli_credentials_set_password(cred, password, CRED_SPECIFIED);
298         }
299
300         
301         domain = ldb_msg_find_attr_as_string(msgs[0], "flatname", NULL);
302         if (domain) {
303                 cli_credentials_set_domain(cred, domain, CRED_SPECIFIED);
304         }
305
306         realm = ldb_msg_find_attr_as_string(msgs[0], "realm", NULL);
307         if (realm) {
308                 cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
309         }
310
311         if (machine_account) {
312                 cli_credentials_set_username(cred, machine_account, CRED_SPECIFIED);
313         }
314
315         cli_credentials_set_kvno(cred, ldb_msg_find_attr_as_int(msgs[0], "msDS-KeyVersionNumber", 0));
316
317         /* If there was an external keytab specified by reference in
318          * the LDB, then use this.  Otherwise we will make one up
319          * (chewing CPU time) from the password */
320         keytab = ldb_msg_find_attr_as_string(msgs[0], "krb5Keytab", NULL);
321         if (keytab) {
322                 cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED);
323         } else {
324                 keytab = ldb_msg_find_attr_as_string(msgs[0], "privateKeytab", NULL);
325                 if (keytab) {
326                         keytab = talloc_asprintf(mem_ctx, "FILE:%s", private_path(mem_ctx, lp_ctx, keytab));
327                         if (keytab) {
328                                 cli_credentials_set_keytab_name(cred, event_ctx, lp_ctx, keytab, CRED_SPECIFIED);
329                         }
330                 }
331         }
332         talloc_free(mem_ctx);
333         
334         return NT_STATUS_OK;
335 }
336
337 /**
338  * Fill in credentials for the machine trust account, from the secrets database.
339  * 
340  * @param cred Credentials structure to fill in
341  * @retval NTSTATUS error detailing any failure
342  */
343 _PUBLIC_ NTSTATUS cli_credentials_set_machine_account(struct cli_credentials *cred,
344                                                       struct loadparm_context *lp_ctx)
345 {
346         NTSTATUS status;
347         char *filter;
348         /* Bleh, nasty recursion issues: We are setting a machine
349          * account here, so we don't want the 'pending' flag around
350          * any more */
351         cred->machine_account_pending = false;
352         filter = talloc_asprintf(cred, SECRETS_PRIMARY_DOMAIN_FILTER, 
353                                        cli_credentials_get_domain(cred));
354         status = cli_credentials_set_secrets(cred, event_context_find(cred), lp_ctx, NULL, 
355                                            SECRETS_PRIMARY_DOMAIN_DN,
356                                            filter);
357         if (!NT_STATUS_IS_OK(status)) {
358                 DEBUG(1, ("Could not find machine account in secrets database: %s", nt_errstr(status)));
359         }
360         return status;
361 }
362
363 /**
364  * Fill in credentials for the machine trust account, from the secrets database.
365  * 
366  * @param cred Credentials structure to fill in
367  * @retval NTSTATUS error detailing any failure
368  */
369 NTSTATUS cli_credentials_set_krbtgt(struct cli_credentials *cred,
370                                     struct tevent_context *event_ctx,
371                                     struct loadparm_context *lp_ctx)
372 {
373         NTSTATUS status;
374         char *filter;
375         /* Bleh, nasty recursion issues: We are setting a machine
376          * account here, so we don't want the 'pending' flag around
377          * any more */
378         cred->machine_account_pending = false;
379         filter = talloc_asprintf(cred, SECRETS_KRBTGT_SEARCH,
380                                        cli_credentials_get_realm(cred),
381                                        cli_credentials_get_domain(cred));
382         status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL, 
383                                            SECRETS_PRINCIPALS_DN,
384                                            filter);
385         if (!NT_STATUS_IS_OK(status)) {
386                 DEBUG(1, ("Could not find krbtgt (master Kerberos) account in secrets database: %s", nt_errstr(status)));
387         }
388         return status;
389 }
390
391 /**
392  * Fill in credentials for a particular prinicpal, from the secrets database.
393  * 
394  * @param cred Credentials structure to fill in
395  * @retval NTSTATUS error detailing any failure
396  */
397 _PUBLIC_ NTSTATUS cli_credentials_set_stored_principal(struct cli_credentials *cred,
398                                                        struct tevent_context *event_ctx,
399                                               struct loadparm_context *lp_ctx,
400                                               const char *serviceprincipal)
401 {
402         NTSTATUS status;
403         char *filter;
404         /* Bleh, nasty recursion issues: We are setting a machine
405          * account here, so we don't want the 'pending' flag around
406          * any more */
407         cred->machine_account_pending = false;
408         filter = talloc_asprintf(cred, SECRETS_PRINCIPAL_SEARCH,
409                                  cli_credentials_get_realm(cred),
410                                  cli_credentials_get_domain(cred),
411                                  serviceprincipal);
412         status = cli_credentials_set_secrets(cred, event_ctx, lp_ctx, NULL, 
413                                            SECRETS_PRINCIPALS_DN, filter);
414         if (!NT_STATUS_IS_OK(status)) {
415                 DEBUG(1, ("Could not find %s principal in secrets database: %s", serviceprincipal, nt_errstr(status)));
416         }
417         return status;
418 }
419
420 /**
421  * Ask that when required, the credentials system will be filled with
422  * machine trust account, from the secrets database.
423  * 
424  * @param cred Credentials structure to fill in
425  * @note This function is used to call the above function after, rather 
426  *       than during, popt processing.
427  *
428  */
429 _PUBLIC_ void cli_credentials_set_machine_account_pending(struct cli_credentials *cred,
430                                                  struct loadparm_context *lp_ctx)
431 {
432         cred->machine_account_pending = true;
433         cred->machine_account_pending_lp_ctx = lp_ctx;
434 }
435
436