source/passdb/secrets.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Copyright (C) Andrew Tridgell 1992-2001
   4    Copyright (C) Andrew Bartlett      2002
   5    Copyright (C) Rafal Szczesniak     2002
   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 /* the Samba secrets database stores any generated, private information
  23    such as the local SID and machine trust password */
  24
  25 #include "includes.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_PASSDB
  29
  30 static TDB_CONTEXT *tdb;
  31
  32 /* open up the secrets database */
  33 BOOL secrets_init(void)
  34 {
  35         pstring fname;
  36
  37         if (tdb)
  38                 return True;
  39
  40         pstrcpy(fname, lp_private_dir());
  41         pstrcat(fname,"/secrets.tdb");
  42
  43         tdb = tdb_open_log(fname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
  44
  45         if (!tdb) {
  46                 DEBUG(0,("Failed to open %s\n", fname));
  47                 return False;
  48         }
  49         return True;
  50 }
  51
  52 /* read a entry from the secrets database - the caller must free the result
  53    if size is non-null then the size of the entry is put in there
  54  */
  55 void *secrets_fetch(const char *key, size_t *size)
  56 {
  57         TDB_DATA kbuf, dbuf;
  58         secrets_init();
  59         if (!tdb)
  60                 return NULL;
  61         kbuf.dptr = key;
  62         kbuf.dsize = strlen(key);
  63         dbuf = tdb_fetch(tdb, kbuf);
  64         if (size)
  65                 *size = dbuf.dsize;
  66         return dbuf.dptr;
  67 }
  68
  69 /* store a secrets entry
  70  */
  71 BOOL secrets_store(const char *key, void *data, size_t size)
  72 {
  73         TDB_DATA kbuf, dbuf;
  74         secrets_init();
  75         if (!tdb)
  76                 return False;
  77         kbuf.dptr = key;
  78         kbuf.dsize = strlen(key);
  79         dbuf.dptr = data;
  80         dbuf.dsize = size;
  81         return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE) == 0;
  82 }
  83
  84
  85 /* delete a secets database entry
  86  */
  87 BOOL secrets_delete(const char *key)
  88 {
  89         TDB_DATA kbuf;
  90         secrets_init();
  91         if (!tdb)
  92                 return False;
  93         kbuf.dptr = key;
  94         kbuf.dsize = strlen(key);
  95         return tdb_delete(tdb, kbuf) == 0;
  96 }
  97
  98 BOOL secrets_store_domain_sid(char *domain, DOM_SID *sid)
  99 {
 100         fstring key;
 101
 102         slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_DOMAIN_SID, domain);
 103         strupper(key);
 104         return secrets_store(key, sid, sizeof(DOM_SID));
 105 }
 106
 107 BOOL secrets_fetch_domain_sid(char *domain, DOM_SID *sid)
 108 {
 109         DOM_SID *dyn_sid;
 110         fstring key;
 111         size_t size;
 112
 113         slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_DOMAIN_SID, domain);
 114         strupper(key);
 115         dyn_sid = (DOM_SID *)secrets_fetch(key, &size);
 116
 117         if (dyn_sid == NULL)
 118                 return False;
 119
 120         if (size != sizeof(DOM_SID))
 121         {
 122                 SAFE_FREE(dyn_sid);
 123                 return False;
 124         }
 125
 126         *sid = *dyn_sid;
 127         SAFE_FREE(dyn_sid);
 128         return True;
 129 }
 130
 131
 132 /**
 133  * Form a key for fetching the machine trust account password
 134  *
 135  * @param domain domain name
 136  *
 137  * @return stored password's key
 138  **/
 139 const char *trust_keystr(const char *domain)
 140 {
 141         static fstring keystr;
 142
 143         slprintf(keystr,sizeof(keystr)-1,"%s/%s",
 144                  SECRETS_MACHINE_ACCT_PASS, domain);
 145         strupper(keystr);
 146
 147         return keystr;
 148 }
 149
 150 /**
 151  * Form a key for fetching a trusted domain password
 152  *
 153  * @param domain trusted domain name
 154  *
 155  * @return stored password's key
 156  **/
 157 char *trustdom_keystr(const char *domain)
 158 {
 159         static char* keystr;
 160
 161         asprintf(&keystr, "%s/%s", SECRETS_DOMTRUST_ACCT_PASS, domain);
 162         strupper(keystr);
 163
 164         return keystr;
 165 }
 166
 167 /************************************************************************
 168  Routine to get the machine trust account password for a domain.
 169 ************************************************************************/
 170 BOOL secrets_fetch_trust_account_password(char *domain, uint8 ret_pwd[16],
 171                                           time_t *pass_last_set_time)
 172 {
 173         struct machine_acct_pass *pass;
 174         char *plaintext;
 175         size_t size;
 176
 177         plaintext = secrets_fetch_machine_password();
 178         if (plaintext) {
 179                 /* we have an ADS password - use that */
 180                 DEBUG(4,("Using ADS machine password\n"));
 181                 E_md4hash((uchar *)plaintext, ret_pwd);
 182                 SAFE_FREE(plaintext);
 183                 return True;
 184         }
 185
 186         if (!(pass = secrets_fetch(trust_keystr(domain), &size))) {
 187                 DEBUG(5, ("secrets_fetch failed!\n"));
 188                 return False;
 189         }
 190
 191         if (size != sizeof(*pass)) {
 192                 DEBUG(0, ("secrets were of incorrect size!\n"));
 193                 return False;
 194         }
 195
 196         if (pass_last_set_time) *pass_last_set_time = pass->mod_time;
 197         memcpy(ret_pwd, pass->hash, 16);
 198         SAFE_FREE(pass);
 199         return True;
 200 }
 201
 202 /************************************************************************
 203  Routine to get account password to trusted domain
 204 ************************************************************************/
 205 BOOL secrets_fetch_trusted_domain_password(char *domain, char** pwd,
 206                                            DOM_SID *sid, time_t *pass_last_set_time)
 207 {
 208         struct trusted_dom_pass *pass;
 209         size_t size;
 210
 211         /* fetching trusted domain password structure */
 212         if (!(pass = secrets_fetch(trustdom_keystr(domain), &size))) {
 213                 DEBUG(5, ("secrets_fetch failed!\n"));
 214                 return False;
 215         }
 216
 217         if (size != sizeof(*pass)) {
 218                 DEBUG(0, ("secrets were of incorrect size!\n"));
 219                 return False;
 220         }
 221
 222         /* the trust's password */
 223         if (pwd) {
 224                 *pwd = strdup(pass->pass);
 225                 if (!*pwd) {
 226                         return False;
 227                 }
 228         }
 229
 230         /* last change time */
 231         if (pass_last_set_time) *pass_last_set_time = pass->mod_time;
 232
 233         /* domain sid */
 234         memcpy(&sid, &(pass->domain_sid), sizeof(sid));
 235
 236         SAFE_FREE(pass);
 237
 238         return True;
 239 }
 240
 241 /************************************************************************
 242  Routine to set the trust account password for a domain.
 243 ************************************************************************/
 244 BOOL secrets_store_trust_account_password(char *domain, uint8 new_pwd[16])
 245 {
 246         struct machine_acct_pass pass;
 247
 248         pass.mod_time = time(NULL);
 249         memcpy(pass.hash, new_pwd, 16);
 250
 251         return secrets_store(trust_keystr(domain), (void *)&pass, sizeof(pass));
 252 }
 253
 254 /**
 255  * Routine to set the password for trusted domain
 256  *
 257  * @param domain remote domain name
 258  * @param pwd plain text password of trust relationship
 259  * @param sid remote domain sid
 260  *
 261  * @return true if succeeded
 262  **/
 263
 264 BOOL secrets_store_trusted_domain_password(char* domain, smb_ucs2_t *uni_dom_name,
 265                                            size_t uni_name_len, char* pwd,
 266                                            DOM_SID sid)
 267 {
 268         struct trusted_dom_pass pass;
 269         ZERO_STRUCT(pass);
 270
 271         /* unicode domain name and its length */
 272         if (!uni_dom_name)
 273                 return False;
 274
 275         strncpy_w(pass.uni_name, uni_dom_name, sizeof(pass.uni_name) - 1);
 276         pass.uni_name_len = uni_name_len;
 277
 278         /* last change time */
 279         pass.mod_time = time(NULL);
 280
 281         /* password of the trust */
 282         pass.pass_len = strlen(pwd);
 283         fstrcpy(pass.pass, pwd);
 284
 285         /* domain sid */
 286         memcpy(&(pass.domain_sid), &sid, sizeof(sid));
 287
 288         return secrets_store(trustdom_keystr(domain), (void *)&pass, sizeof(pass));
 289 }
 290
 291 /************************************************************************
 292  Routine to set the plaintext machine account password for a realm
 293 the password is assumed to be a null terminated ascii string
 294 ************************************************************************/
 295 BOOL secrets_store_machine_password(char *pass)
 296 {
 297         char *key;
 298         BOOL ret;
 299         asprintf(&key, "%s/%s", SECRETS_MACHINE_PASSWORD, lp_workgroup());
 300         strupper(key);
 301         ret = secrets_store(key, pass, strlen(pass)+1);
 302         free(key);
 303         return ret;
 304 }
 305
 306
 307 /************************************************************************
 308  Routine to fetch the plaintext machine account password for a realm
 309 the password is assumed to be a null terminated ascii string
 310 ************************************************************************/
 311 char *secrets_fetch_machine_password(void)
 312 {
 313         char *key;
 314         char *ret;
 315         asprintf(&key, "%s/%s", SECRETS_MACHINE_PASSWORD, lp_workgroup());
 316         strupper(key);
 317         ret = (char *)secrets_fetch(key, NULL);
 318         free(key);
 319         return ret;
 320 }
 321
 322
 323
 324 /************************************************************************
 325  Routine to delete the machine trust account password file for a domain.
 326 ************************************************************************/
 327
 328 BOOL trust_password_delete(const char *domain)
 329 {
 330         return secrets_delete(trust_keystr(domain));
 331 }
 332
 333 /************************************************************************
 334  Routine to delete the password for trusted domain
 335 ************************************************************************/
 336 BOOL trusted_domain_password_delete(const char *domain)
 337 {
 338         return secrets_delete(trustdom_keystr(domain));
 339 }
 340
 341
 342 /*******************************************************************
 343  Reset the 'done' variables so after a client process is created
 344  from a fork call these calls will be re-done. This should be
 345  expanded if more variables need reseting.
 346  ******************************************************************/
 347
 348 void reset_globals_after_fork(void)
 349 {
 350         unsigned char dummy;
 351
 352         secrets_init();
 353
 354         /*
 355          * Increment the global seed value to ensure every smbd starts
 356          * with a new random seed.
 357          */
 358
 359         if (tdb) {
 360                 uint32 initial_val = sys_getpid();
 361                 tdb_change_int32_atomic(tdb, "INFO/random_seed", (int *)&initial_val, 1);
 362                 set_rand_reseed_data((unsigned char *)&initial_val, sizeof(initial_val));
 363         }
 364
 365         /*
 366          * Re-seed the random crypto generator, so all smbd's
 367          * started from the same parent won't generate the same
 368          * sequence.
 369          */
 370         generate_random_buffer( &dummy, 1, True);
 371 }
 372
 373 BOOL secrets_store_ldap_pw(const char* dn, char* pw)
 374 {
 375         char *key = NULL;
 376         BOOL ret;
 377
 378         if (asprintf(&key, "%s/%s", SECRETS_LDAP_BIND_PW, dn) < 0) {
 379                 DEBUG(0, ("secrets_store_ldap_pw: asprintf failed!\n"));
 380                 return False;
 381         }
 382
 383         ret = secrets_store(key, pw, strlen(pw)+1);
 384
 385         SAFE_FREE(key);
 386         return ret;
 387 }
 388
 389
 390 /**
 391  * The linked list is allocated on the supplied talloc context, caller gets to destory
 392  * when done.
 393  *
 394  * @param ctx Allocation context
 395  * @param enum_ctx Starting index, eg. we can start fetching at third
 396  *        or sixth trusted domain entry. Zero is the first index.
 397  *        Value it is set to is the enum context for the next enumeration.
 398  * @param num_domains Number of domain entries to fetch at one call
 399  * @param domains Pointer to array of trusted domain structs to be filled up
 400  *
 401  * @return nt status code of rpc response
 402  **/
 403
 404 NTSTATUS secrets_get_trusted_domains(TALLOC_CTX* ctx, int* enum_ctx, int max_num_domains, int *num_domains, TRUSTDOM ***domains)
 405 {
 406         TDB_LIST_NODE *keys, *k;
 407         TRUSTDOM *dom = NULL;
 408         char *pattern;
 409         int start_idx;
 410         uint32 idx = 0;
 411         size_t size;
 412         struct trusted_dom_pass *pass;
 413         NTSTATUS status;
 414
 415         secrets_init();
 416
 417         *num_domains = 0;
 418         start_idx = *enum_ctx;
 419
 420         /* generate searching pattern */
 421         if (!(pattern = talloc_asprintf(ctx, "%s/*", SECRETS_DOMTRUST_ACCT_PASS))) {
 422                 DEBUG(0, ("secrets_get_trusted_domains: talloc_asprintf() failed!\n"));
 423                 return NT_STATUS_NO_MEMORY;
 424         }
 425
 426         DEBUG(5, ("secrets_get_trusted_domains: looking for %d domains, starting at index %d\n",
 427                   max_num_domains, *enum_ctx));
 428
 429         *domains = talloc_zero(ctx, sizeof(**domains)*max_num_domains);
 430
 431         /* fetching trusted domains' data and collecting them in a list */
 432         keys = tdb_search_keys(tdb, pattern);
 433
 434         /*
 435          * if there's no keys returned ie. no trusted domain,
 436          * return "no more entries" code
 437          */
 438         status = NT_STATUS_NO_MORE_ENTRIES;
 439
 440         /* searching for keys in sectrets db -- way to go ... */
 441         for (k = keys; k; k = k->next) {
 442                 char *secrets_key;
 443
 444                 /* important: ensure null-termination of the key string */
 445                 secrets_key = strndup(k->node_key.dptr, k->node_key.dsize);
 446                 if (!secrets_key) {
 447                         DEBUG(0, ("strndup failed!\n"));
 448                         return NT_STATUS_NO_MEMORY;
 449                 }
 450
 451                 pass = secrets_fetch(secrets_key, &size);
 452
 453                 if (size != sizeof(*pass)) {
 454                         DEBUG(2, ("Secrets record %s is invalid!\n", secrets_key));
 455                         SAFE_FREE(pass);
 456                         continue;
 457                 }
 458
 459                 SAFE_FREE(secrets_key);
 460
 461                 if (idx >= start_idx && idx < start_idx + max_num_domains) {
 462                         dom = talloc_zero(ctx, sizeof(*dom));
 463                         if (!dom) {
 464                                 /* free returned tdb record */
 465                                 SAFE_FREE(pass);
 466
 467                                 return NT_STATUS_NO_MEMORY;
 468                         }
 469
 470                         /* copy domain sid */
 471                         SMB_ASSERT(sizeof(dom->sid) == sizeof(pass->domain_sid));
 472                         memcpy(&(dom->sid), &(pass->domain_sid), sizeof(dom->sid));
 473
 474                         /* copy unicode domain name */
 475                         dom->name = talloc_strdup_w(ctx, pass->uni_name);
 476
 477                         (*domains)[idx - start_idx] = dom;
 478
 479                         *enum_ctx = idx + 1;
 480                         (*num_domains)++;
 481
 482                         /* set proper status code to return */
 483                         if (k->next) {
 484                                 /* there are yet some entries to enumerate */
 485                                 status = STATUS_MORE_ENTRIES;
 486                         } else {
 487                                 /* this is the last entry in the whole enumeration */
 488                                 status = NT_STATUS_OK;
 489                         }
 490                 }
 491
 492                 idx++;
 493
 494                 /* free returned tdb record */
 495                 SAFE_FREE(pass);
 496         }
 497
 498         DEBUG(5, ("secrets_get_trusted_domains: got %d domains\n", *num_domains));
 499
 500         /* free the results of searching the keys */
 501         tdb_search_list_free(keys);
 502
 503         return status;
 504 }
 505