source3/winbindd/idmap_autorid_tdb.c

   1 /*
   2  *  idmap_autorid_tdb: This file contains common code used by
   3  *  idmap_autorid and net idmap autorid utilities. The common
   4  *  code provides functions for performing various operations
   5  *  on autorid.tdb
   6  *
   7  *  Copyright (C) Christian Ambach, 2010-2012
   8  *  Copyright (C) Atul Kulkarni, 2013
   9  *  Copyright (C) Michael Adam, 2012-2013
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 3 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  23  *
  24  */
  25
  26 #include "idmap_autorid_tdb.h"
  27
  28 static NTSTATUS idmap_autorid_get_domainrange_action(struct db_context *db,
  29                                               void *private_data)
  30 {
  31         NTSTATUS ret;
  32         uint32_t rangenum, hwm;
  33         char *numstr;
  34         struct autorid_range_config *range;
  35
  36         range = (struct autorid_range_config *)private_data;
  37
  38         ret = dbwrap_fetch_uint32_bystring(db, range->keystr,
  39                                            &(range->rangenum));
  40
  41         if (NT_STATUS_IS_OK(ret)) {
  42                 /* entry is already present*/
  43                 return ret;
  44         }
  45
  46         DEBUG(10, ("Acquiring new range for domain %s "
  47                    "(domain_range_index=%"PRIu32")\n",
  48                    range->domsid, range->domain_range_index));
  49
  50         /* fetch the current HWM */
  51         ret = dbwrap_fetch_uint32_bystring(db, HWM, &hwm);
  52         if (!NT_STATUS_IS_OK(ret)) {
  53                 DEBUG(1, ("Fatal error while fetching current "
  54                           "HWM value: %s\n", nt_errstr(ret)));
  55                 ret = NT_STATUS_INTERNAL_ERROR;
  56                 goto error;
  57         }
  58
  59         /* do we have a range left? */
  60         if (hwm >= range->globalcfg->maxranges) {
  61                 DEBUG(1, ("No more domain ranges available!\n"));
  62                 ret = NT_STATUS_NO_MEMORY;
  63                 goto error;
  64         }
  65
  66         /* increase the HWM */
  67         ret = dbwrap_change_uint32_atomic_bystring(db, HWM, &rangenum, 1);
  68         if (!NT_STATUS_IS_OK(ret)) {
  69                 DEBUG(1, ("Fatal error while fetching a new "
  70                           "domain range value!\n"));
  71                 goto error;
  72         }
  73
  74         /* store away the new mapping in both directions */
  75         ret = dbwrap_store_uint32_bystring(db, range->keystr, rangenum);
  76         if (!NT_STATUS_IS_OK(ret)) {
  77                 DEBUG(1, ("Fatal error while storing new "
  78                           "domain->range assignment!\n"));
  79                 goto error;
  80         }
  81
  82         numstr = talloc_asprintf(db, "%u", rangenum);
  83         if (!numstr) {
  84                 ret = NT_STATUS_NO_MEMORY;
  85                 goto error;
  86         }
  87
  88         ret = dbwrap_store_bystring(db, numstr,
  89                         string_term_tdb_data(range->keystr), TDB_INSERT);
  90
  91         talloc_free(numstr);
  92         if (!NT_STATUS_IS_OK(ret)) {
  93                 DEBUG(1, ("Fatal error while storing "
  94                           "new domain->range assignment!\n"));
  95                 goto error;
  96         }
  97         DEBUG(5, ("Acquired new range #%d for domain %s "
  98                   "(domain_range_index=%"PRIu32")\n", rangenum, range->keystr,
  99                   range->domain_range_index));
 100
 101         range->rangenum = rangenum;
 102
 103         return NT_STATUS_OK;
 104
 105 error:
 106         return ret;
 107
 108 }
 109
 110 NTSTATUS idmap_autorid_get_domainrange(struct db_context *db,
 111                                        struct autorid_range_config *range,
 112                                        bool read_only)
 113 {
 114         NTSTATUS ret;
 115
 116         /*
 117          * try to find mapping without locking the database,
 118          * if it is not found create a mapping in a transaction unless
 119          * read-only mode has been set
 120          */
 121         if (range->domain_range_index > 0) {
 122                 snprintf(range->keystr, FSTRING_LEN, "%s#%"PRIu32,
 123                          range->domsid, range->domain_range_index);
 124         } else {
 125                 fstrcpy(range->keystr, range->domsid);
 126         }
 127
 128         ret = dbwrap_fetch_uint32_bystring(db, range->keystr,
 129                                            &(range->rangenum));
 130
 131         if (!NT_STATUS_IS_OK(ret)) {
 132                 if (read_only) {
 133                         return NT_STATUS_NOT_FOUND;
 134                 }
 135                 ret = dbwrap_trans_do(db,
 136                               idmap_autorid_get_domainrange_action, range);
 137         }
 138
 139         range->low_id = range->globalcfg->minvalue
 140                       + range->rangenum * range->globalcfg->rangesize;
 141
 142         DEBUG(10, ("Using range #%d for domain %s "
 143                    "(domain_range_index=%"PRIu32", low_id=%"PRIu32")\n",
 144                    range->rangenum, range->domsid, range->domain_range_index,
 145                    range->low_id));
 146
 147         return ret;
 148 }
 149
 150 /* initialize the given HWM to 0 if it does not exist yet */
 151 NTSTATUS idmap_autorid_init_hwm(struct db_context *db, const char *hwm)
 152 {
 153         NTSTATUS status;
 154         uint32_t hwmval;
 155
 156         status = dbwrap_fetch_uint32_bystring(db, hwm, &hwmval);
 157         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))  {
 158                 status = dbwrap_trans_store_int32_bystring(db, hwm, 0);
 159                 if (!NT_STATUS_IS_OK(status)) {
 160                         DEBUG(0,
 161                               ("Unable to initialise HWM (%s) in autorid "
 162                                "database: %s\n", hwm, nt_errstr(status)));
 163                         return NT_STATUS_INTERNAL_DB_ERROR;
 164                 }
 165         } else if (!NT_STATUS_IS_OK(status)) {
 166                 DEBUG(0, ("unable to fetch HWM (%s) from autorid "
 167                           "database: %s\n", hwm,  nt_errstr(status)));
 168                 return status;
 169         }
 170
 171         return NT_STATUS_OK;
 172 }
 173
 174 /*
 175  * open and initialize the database which stores the ranges for the domains
 176  */
 177 NTSTATUS idmap_autorid_db_init(const char *path,
 178                                TALLOC_CTX *mem_ctx,
 179                                struct db_context **db)
 180 {
 181         NTSTATUS status;
 182
 183         if (*db != NULL) {
 184                 /* its already open */
 185                 return NT_STATUS_OK;
 186         }
 187
 188         /* Open idmap repository */
 189         *db = db_open(mem_ctx, path, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
 190                       DBWRAP_LOCK_ORDER_1);
 191
 192         if (*db == NULL) {
 193                 DEBUG(0, ("Unable to open idmap_autorid database '%s'\n", path));
 194                 return NT_STATUS_UNSUCCESSFUL;
 195         }
 196
 197         /* Initialize high water mark for the currently used range to 0 */
 198
 199         status = idmap_autorid_init_hwm(*db, HWM);
 200         NT_STATUS_NOT_OK_RETURN(status);
 201
 202         status = idmap_autorid_init_hwm(*db, ALLOC_HWM_UID);
 203         NT_STATUS_NOT_OK_RETURN(status);
 204
 205         status = idmap_autorid_init_hwm(*db, ALLOC_HWM_GID);
 206
 207         return status;
 208 }
 209
 210 struct idmap_autorid_fetch_config_state {
 211         TALLOC_CTX *mem_ctx;
 212         char *configstr;
 213 };
 214
 215 static void idmap_autorid_config_parser(TDB_DATA key, TDB_DATA value,
 216                                         void *private_data)
 217 {
 218         struct idmap_autorid_fetch_config_state *state;
 219
 220         state = (struct idmap_autorid_fetch_config_state *)private_data;
 221
 222         /*
 223          * strndup because we have non-nullterminated strings in the db
 224          */
 225         state->configstr = talloc_strndup(
 226                 state->mem_ctx, (const char *)value.dptr, value.dsize);
 227 }
 228
 229 NTSTATUS idmap_autorid_getconfigstr(struct db_context *db, TALLOC_CTX *mem_ctx,
 230                                     char **result)
 231 {
 232         TDB_DATA key;
 233         NTSTATUS status;
 234         struct idmap_autorid_fetch_config_state state;
 235
 236         if (result == NULL) {
 237                 return NT_STATUS_INVALID_PARAMETER;
 238         }
 239
 240         key = string_term_tdb_data(CONFIGKEY);
 241
 242         state.mem_ctx = mem_ctx;
 243         state.configstr = NULL;
 244
 245         status = dbwrap_parse_record(db, key, idmap_autorid_config_parser,
 246                                      &state);
 247         if (!NT_STATUS_IS_OK(status)) {
 248                 DEBUG(1, ("Error while retrieving config: %s\n",
 249                           nt_errstr(status)));
 250                 return status;
 251         }
 252
 253         if (state.configstr == NULL) {
 254                 DEBUG(1, ("Error while retrieving config\n"));
 255                 return NT_STATUS_NO_MEMORY;
 256         }
 257
 258         DEBUG(5, ("found CONFIG: %s\n", state.configstr));
 259
 260         *result = state.configstr;
 261         return NT_STATUS_OK;
 262 }
 263
 264 bool idmap_autorid_parse_configstr(const char *configstr,
 265                                    struct autorid_global_config *cfg)
 266 {
 267         unsigned long minvalue, rangesize, maxranges;
 268
 269         if (sscanf(configstr,
 270                    "minvalue:%lu rangesize:%lu maxranges:%lu",
 271                    &minvalue, &rangesize, &maxranges) != 3) {
 272                 DEBUG(1,
 273                       ("Found invalid configuration data"
 274                        "creating new config\n"));
 275                 return false;
 276         }
 277
 278         cfg->minvalue = minvalue;
 279         cfg->rangesize = rangesize;
 280         cfg->maxranges = maxranges;
 281
 282         return true;
 283 }
 284
 285 NTSTATUS idmap_autorid_loadconfig(struct db_context *db,
 286                                   TALLOC_CTX *mem_ctx,
 287                                   struct autorid_global_config **result)
 288 {
 289         struct autorid_global_config *cfg;
 290         NTSTATUS status;
 291         bool ok;
 292         char *configstr = NULL;
 293
 294         if (result == NULL) {
 295                 return NT_STATUS_INVALID_PARAMETER;
 296         }
 297
 298         status = idmap_autorid_getconfigstr(db, mem_ctx, &configstr);
 299         if (!NT_STATUS_IS_OK(status)) {
 300                 return status;
 301         }
 302
 303         cfg = talloc_zero(mem_ctx, struct autorid_global_config);
 304         if (cfg == NULL) {
 305                 return NT_STATUS_NO_MEMORY;
 306         }
 307
 308         ok = idmap_autorid_parse_configstr(configstr, cfg);
 309         if (!ok) {
 310                 talloc_free(cfg);
 311                 return NT_STATUS_INVALID_PARAMETER;
 312         }
 313
 314         DEBUG(10, ("Loaded previously stored configuration "
 315                    "minvalue:%d rangesize:%d\n",
 316                    cfg->minvalue, cfg->rangesize));
 317
 318         *result = cfg;
 319
 320         return NT_STATUS_OK;
 321 }
 322
 323 NTSTATUS idmap_autorid_saveconfig(struct db_context *db,
 324                                   struct autorid_global_config *cfg)
 325 {
 326
 327         NTSTATUS status;
 328         TDB_DATA data;
 329         char *cfgstr;
 330
 331         cfgstr =
 332             talloc_asprintf(talloc_tos(),
 333                             "minvalue:%u rangesize:%u maxranges:%u",
 334                             cfg->minvalue, cfg->rangesize, cfg->maxranges);
 335
 336         if (!cfgstr) {
 337                 return NT_STATUS_NO_MEMORY;
 338         }
 339
 340         data = string_tdb_data(cfgstr);
 341
 342         status = dbwrap_trans_store_bystring(db, CONFIGKEY, data, TDB_REPLACE);
 343
 344         talloc_free(cfgstr);
 345
 346         return status;
 347 }