source/libads/ldap_utils.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Some Helpful wrappers on LDAP
   5
   6    Copyright (C) Andrew Tridgell 2001
   7    Copyright (C) Guenther Deschner 2006,2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 #ifdef HAVE_LDAP
  26 /*
  27   a wrapper around ldap_search_s that retries depending on the error code
  28   this is supposed to catch dropped connections and auto-reconnect
  29 */
  30 static ADS_STATUS ads_do_search_retry_internal(ADS_STRUCT *ads, const char *bind_path, int scope,
  31                                                const char *expr,
  32                                                const char **attrs, void *args,
  33                                                LDAPMessage **res)
  34 {
  35         ADS_STATUS status = ADS_SUCCESS;
  36         int count = 3;
  37         char *bp;
  38
  39         *res = NULL;
  40
  41         if (!ads->ld &&
  42             time(NULL) - ads->last_attempt < ADS_RECONNECT_TIME) {
  43                 return ADS_ERROR(LDAP_SERVER_DOWN);
  44         }
  45
  46         bp = SMB_STRDUP(bind_path);
  47
  48         if (!bp) {
  49                 return ADS_ERROR(LDAP_NO_MEMORY);
  50         }
  51
  52         *res = NULL;
  53
  54         /* when binding anonymously, we cannot use the paged search LDAP
  55          * control - Guenther */
  56
  57         if (ads->auth.flags & ADS_AUTH_ANON_BIND) {
  58                 status = ads_do_search(ads, bp, scope, expr, attrs, res);
  59         } else {
  60                 status = ads_do_search_all_args(ads, bp, scope, expr, attrs, args, res);
  61         }
  62         if (ADS_ERR_OK(status)) {
  63                 DEBUG(5,("Search for %s in <%s> gave %d replies\n",
  64                         expr, bp, ads_count_replies(ads, *res)));
  65                 SAFE_FREE(bp);
  66                 return status;
  67         }
  68
  69         while (--count) {
  70
  71                 if (*res)
  72                         ads_msgfree(ads, *res);
  73                 *res = NULL;
  74
  75                 DEBUG(3,("Reopening ads connection to realm '%s' after error %s\n",
  76                          ads->config.realm, ads_errstr(status)));
  77
  78                 if (ads->ld) {
  79                         ldap_unbind(ads->ld);
  80                 }
  81
  82                 ads->ld = NULL;
  83                 status = ads_connect(ads);
  84
  85                 if (!ADS_ERR_OK(status)) {
  86                         DEBUG(1,("ads_search_retry: failed to reconnect (%s)\n",
  87                                  ads_errstr(status)));
  88                         ads_destroy(&ads);
  89                         SAFE_FREE(bp);
  90                         return status;
  91                 }
  92
  93                 *res = NULL;
  94
  95                 /* when binding anonymously, we cannot use the paged search LDAP
  96                  * control - Guenther */
  97
  98                 if (ads->auth.flags & ADS_AUTH_ANON_BIND) {
  99                         status = ads_do_search(ads, bp, scope, expr, attrs, res);
 100                 } else {
 101                         status = ads_do_search_all_args(ads, bp, scope, expr, attrs, args, res);
 102                 }
 103
 104                 if (ADS_ERR_OK(status)) {
 105                         DEBUG(5,("Search for filter: %s, base: %s gave %d replies\n",
 106                                  expr, bp, ads_count_replies(ads, *res)));
 107                         SAFE_FREE(bp);
 108                         return status;
 109                 }
 110         }
 111         SAFE_FREE(bp);
 112
 113         if (!ADS_ERR_OK(status)) {
 114                 DEBUG(1,("ads reopen failed after error %s\n",
 115                          ads_errstr(status)));
 116         }
 117         return status;
 118 }
 119
 120  ADS_STATUS ads_do_search_retry(ADS_STRUCT *ads, const char *bind_path,
 121                                 int scope, const char *expr,
 122                                 const char **attrs, LDAPMessage **res)
 123 {
 124         return ads_do_search_retry_internal(ads, bind_path, scope, expr, attrs, NULL, res);
 125 }
 126
 127  ADS_STATUS ads_do_search_retry_args(ADS_STRUCT *ads, const char *bind_path,
 128                                      int scope, const char *expr,
 129                                      const char **attrs, void *args,
 130                                      LDAPMessage **res)
 131 {
 132         return ads_do_search_retry_internal(ads, bind_path, scope, expr, attrs, args, res);
 133 }
 134
 135
 136  ADS_STATUS ads_search_retry(ADS_STRUCT *ads, LDAPMessage **res,
 137                              const char *expr, const char **attrs)
 138 {
 139         return ads_do_search_retry(ads, ads->config.bind_path, LDAP_SCOPE_SUBTREE,
 140                                    expr, attrs, res);
 141 }
 142
 143  ADS_STATUS ads_search_retry_dn(ADS_STRUCT *ads, LDAPMessage **res,
 144                                 const char *dn,
 145                                 const char **attrs)
 146 {
 147         return ads_do_search_retry(ads, dn, LDAP_SCOPE_BASE,
 148                                    "(objectclass=*)", attrs, res);
 149 }
 150
 151  ADS_STATUS ads_search_retry_extended_dn(ADS_STRUCT *ads, LDAPMessage **res,
 152                                          const char *dn,
 153                                          const char **attrs,
 154                                          enum ads_extended_dn_flags flags)
 155 {
 156         ads_control args;
 157
 158         args.control = ADS_EXTENDED_DN_OID;
 159         args.val = flags;
 160         args.critical = True;
 161
 162         return ads_do_search_retry_args(ads, dn, LDAP_SCOPE_BASE,
 163                                         "(objectclass=*)", attrs, &args, res);
 164 }
 165
 166  ADS_STATUS ads_search_retry_extended_dn_ranged(ADS_STRUCT *ads, TALLOC_CTX *mem_ctx,
 167                                                 const char *dn,
 168                                                 const char **attrs,
 169                                                 enum ads_extended_dn_flags flags,
 170                                                 char ***strings,
 171                                                 size_t *num_strings)
 172 {
 173         ads_control args;
 174
 175         args.control = ADS_EXTENDED_DN_OID;
 176         args.val = flags;
 177         args.critical = True;
 178
 179         /* we can only range process one attribute */
 180         if (!attrs || !attrs[0] || attrs[1]) {
 181                 return ADS_ERROR_NT(NT_STATUS_INVALID_PARAMETER);
 182         }
 183
 184         return ads_ranged_search(ads, mem_ctx, LDAP_SCOPE_BASE, dn,
 185                                  "(objectclass=*)", &args, attrs[0],
 186                                  strings, num_strings);
 187
 188 }
 189
 190  ADS_STATUS ads_search_retry_dn_sd_flags(ADS_STRUCT *ads, LDAPMessage **res,
 191                                          uint32 sd_flags,
 192                                          const char *dn,
 193                                          const char **attrs)
 194 {
 195         ads_control args;
 196
 197         args.control = ADS_SD_FLAGS_OID;
 198         args.val = sd_flags;
 199         args.critical = True;
 200
 201         return ads_do_search_retry_args(ads, dn, LDAP_SCOPE_BASE,
 202                                         "(objectclass=*)", attrs, &args, res);
 203 }
 204
 205  ADS_STATUS ads_search_retry_sid(ADS_STRUCT *ads, LDAPMessage **res,
 206                                  const DOM_SID *sid,
 207                                  const char **attrs)
 208 {
 209         char *dn, *sid_string;
 210         ADS_STATUS status;
 211
 212         sid_string = sid_binstring_hex(sid);
 213         if (sid_string == NULL) {
 214                 return ADS_ERROR(LDAP_NO_MEMORY);
 215         }
 216
 217         if (!asprintf(&dn, "<SID=%s>", sid_string)) {
 218                 SAFE_FREE(sid_string);
 219                 return ADS_ERROR(LDAP_NO_MEMORY);
 220         }
 221
 222         status = ads_do_search_retry(ads, dn, LDAP_SCOPE_BASE,
 223                                    "(objectclass=*)", attrs, res);
 224         SAFE_FREE(dn);
 225         SAFE_FREE(sid_string);
 226         return status;
 227 }
 228
 229 ADS_STATUS ads_ranged_search(ADS_STRUCT *ads,
 230                              TALLOC_CTX *mem_ctx,
 231                              int scope,
 232                              const char *base,
 233                              const char *filter,
 234                              void *args,
 235                              const char *range_attr,
 236                              char ***strings,
 237                              size_t *num_strings)
 238 {
 239         ADS_STATUS status;
 240         uint32 first_usn;
 241         int num_retries = 0;
 242         const char **attrs;
 243         BOOL more_values = False;
 244
 245         *num_strings = 0;
 246         *strings = NULL;
 247
 248         attrs = TALLOC_ARRAY(mem_ctx, const char *, 3);
 249         ADS_ERROR_HAVE_NO_MEMORY(attrs);
 250
 251         attrs[0] = talloc_strdup(mem_ctx, range_attr);
 252         attrs[1] = talloc_strdup(mem_ctx, "usnChanged");
 253         attrs[2] = NULL;
 254
 255         ADS_ERROR_HAVE_NO_MEMORY(attrs[0]);
 256         ADS_ERROR_HAVE_NO_MEMORY(attrs[1]);
 257
 258         do {
 259                 status = ads_ranged_search_internal(ads, mem_ctx,
 260                                                     scope, base, filter,
 261                                                     attrs, args, range_attr,
 262                                                     strings, num_strings,
 263                                                     &first_usn, &num_retries,
 264                                                     &more_values);
 265
 266                 if (NT_STATUS_EQUAL(STATUS_MORE_ENTRIES, ads_ntstatus(status))) {
 267                         continue;
 268                 }
 269
 270                 if (!ADS_ERR_OK(status)) {
 271                         *num_strings = 0;
 272                         strings = NULL;
 273                         goto done;
 274                 }
 275
 276         } while (more_values);
 277
 278  done:
 279         DEBUG(10,("returning with %d strings\n", (int)*num_strings));
 280
 281         return status;
 282 }
 283
 284 ADS_STATUS ads_ranged_search_internal(ADS_STRUCT *ads,
 285                                       TALLOC_CTX *mem_ctx,
 286                                       int scope,
 287                                       const char *base,
 288                                       const char *filter,
 289                                       const char **attrs,
 290                                       void *args,
 291                                       const char *range_attr,
 292                                       char ***strings,
 293                                       size_t *num_strings,
 294                                       uint32 *first_usn,
 295                                       int *num_retries,
 296                                       BOOL *more_values)
 297 {
 298         LDAPMessage *res = NULL;
 299         ADS_STATUS status;
 300         int count;
 301         uint32 current_usn;
 302
 303         DEBUG(10, ("Searching for attrs[0] = %s, attrs[1] = %s\n", attrs[0], attrs[1]));
 304
 305         *more_values = False;
 306
 307         status = ads_do_search_retry_internal(ads, base, scope, filter, attrs, args, &res);
 308
 309         if (!ADS_ERR_OK(status)) {
 310                 DEBUG(1,("ads_search: %s\n",
 311                          ads_errstr(status)));
 312                 return status;
 313         }
 314
 315         if (!res) {
 316                 return ADS_ERROR(LDAP_NO_MEMORY);
 317         }
 318
 319         count = ads_count_replies(ads, res);
 320         if (count == 0) {
 321                 ads_msgfree(ads, res);
 322                 return ADS_ERROR(LDAP_SUCCESS);
 323         }
 324
 325         if (*num_strings == 0) {
 326                 if (!ads_pull_uint32(ads, res, "usnChanged", first_usn)) {
 327                         DEBUG(1, ("could not pull first usnChanged!\n"));
 328                         ads_msgfree(ads, res);
 329                         return ADS_ERROR(LDAP_NO_MEMORY);
 330                 }
 331         }
 332
 333         if (!ads_pull_uint32(ads, res, "usnChanged", &current_usn)) {
 334                 DEBUG(1, ("could not pull current usnChanged!\n"));
 335                 ads_msgfree(ads, res);
 336                 return ADS_ERROR(LDAP_NO_MEMORY);
 337         }
 338
 339         if (*first_usn != current_usn) {
 340                 DEBUG(5, ("USN on this record changed"
 341                           " - restarting search\n"));
 342                 if (*num_retries < 5) {
 343                         (*num_retries)++;
 344                         *num_strings = 0;
 345                         ads_msgfree(ads, res);
 346                         return ADS_ERROR_NT(STATUS_MORE_ENTRIES);
 347                 } else {
 348                         DEBUG(5, ("USN on this record changed"
 349                                   " - restarted search too many times, aborting!\n"));
 350                         ads_msgfree(ads, res);
 351                         return ADS_ERROR(LDAP_NO_MEMORY);
 352                 }
 353         }
 354
 355         *strings = ads_pull_strings_range(ads, mem_ctx, res,
 356                                          range_attr,
 357                                          *strings,
 358                                          &attrs[0],
 359                                          num_strings,
 360                                          more_values);
 361
 362         ads_msgfree(ads, res);
 363
 364         /* paranoia checks */
 365         if (*strings == NULL && *more_values) {
 366                 DEBUG(0,("no strings found but more values???\n"));
 367                 return ADS_ERROR(LDAP_NO_MEMORY);
 368         }
 369         if (*num_strings == 0 && *more_values) {
 370                 DEBUG(0,("no strings found but more values???\n"));
 371                 return ADS_ERROR(LDAP_NO_MEMORY);
 372         }
 373
 374         return (*more_values) ? ADS_ERROR_NT(STATUS_MORE_ENTRIES) : ADS_ERROR(LDAP_SUCCESS);
 375 }
 376
 377 #endif