source3/winbindd/idmap_adex/idmap_adex.c

   1 /*
   2  * idmap_adex: Support for D Forests
   3  *
   4  * Copyright (C) Gerald (Jerry) Carter 2006-2008
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "includes.h"
  22 #include "ads.h"
  23 #include "idmap.h"
  24 #include "idmap_adex.h"
  25 #include "nss_info.h"
  26 #include "secrets.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_IDMAP
  30
  31 #define WINBIND_CCACHE_NAME "MEMORY:winbind_ccache"
  32
  33 /*
  34  * IdMap backend
  35  */
  36
  37 /********************************************************************
  38  Basic init function responsible for determining our current mode
  39  (standalone or using Centeris Cells).  This must return success or
  40  it will be dropped from the idmap backend list.
  41  *******************************************************************/
  42
  43 static NTSTATUS _idmap_adex_init(struct idmap_domain *dom)
  44 {
  45         ADS_STRUCT *ads = NULL;
  46         ADS_STATUS status;
  47         static NTSTATUS init_status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
  48         struct dom_sid domain_sid;
  49         fstring dcname;
  50         struct sockaddr_storage ip;
  51         struct likewise_cell *lwcell;
  52
  53         if (NT_STATUS_IS_OK(init_status))
  54                 return NT_STATUS_OK;
  55
  56         /* Silently fail if we are not a member server in security = ads */
  57
  58         if ((lp_server_role() != ROLE_DOMAIN_MEMBER) ||
  59             (lp_security() != SEC_ADS)) {
  60                 init_status = NT_STATUS_INVALID_SERVER_STATE;
  61                 BAIL_ON_NTSTATUS_ERROR(init_status);
  62         }
  63
  64         /* fetch our domain SID first */
  65
  66         if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) {
  67                 init_status = NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
  68                 BAIL_ON_NTSTATUS_ERROR(init_status);
  69         }
  70
  71         /* reuse the same ticket cache as winbindd */
  72
  73         setenv("KRB5CCNAME", WINBIND_CCACHE_NAME, 1);
  74
  75         /* Establish a connection to a DC */
  76
  77         if ((ads = ads_init(lp_realm(), lp_workgroup(), NULL)) == NULL) {
  78                 init_status = NT_STATUS_NO_MEMORY;
  79                 BAIL_ON_NTSTATUS_ERROR(init_status);
  80         }
  81
  82         ads->auth.password =
  83             secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
  84         ads->auth.realm = SMB_STRDUP(lp_realm());
  85
  86         /* get the DC name here to setup the server affinity cache and
  87            local krb5.conf */
  88
  89         get_dc_name(lp_workgroup(), lp_realm(), dcname, &ip);
  90
  91         status = ads_connect(ads);
  92         if (!ADS_ERR_OK(status)) {
  93                 DEBUG(0, ("_idmap_adex_init: ads_connect() failed! (%s)\n",
  94                           ads_errstr(status)));
  95         }
  96         init_status = ads_ntstatus(status);
  97         BAIL_ON_NTSTATUS_ERROR(init_status);
  98
  99
 100         /* Find out cell membership */
 101
 102         init_status = cell_locate_membership(ads);
 103         if (!NT_STATUS_IS_OK(init_status)) {
 104                 DEBUG(0,("LWI: Fail to locate cell membership (%s).",
 105                          nt_errstr(init_status)));
 106                 goto done;
 107         }
 108
 109         /* Fill in the cell information */
 110
 111         lwcell = cell_list_head();
 112
 113         init_status = cell_lookup_settings(lwcell);
 114         BAIL_ON_NTSTATUS_ERROR(init_status);
 115
 116         /* Miscellaneous setup.  E.g. set up the list of GC
 117            servers and domain list for our forest (does not actually
 118            connect). */
 119
 120         init_status = gc_init_list();
 121         BAIL_ON_NTSTATUS_ERROR(init_status);
 122
 123         init_status = domain_init_list();
 124         BAIL_ON_NTSTATUS_ERROR(init_status);
 125
 126 done:
 127         if (!NT_STATUS_IS_OK(init_status)) {
 128                 DEBUG(1,("Likewise initialization failed (%s)\n",
 129                          nt_errstr(init_status)));
 130         }
 131
 132         /* cleanup */
 133
 134         if (!NT_STATUS_IS_OK(init_status)) {
 135                 cell_list_destroy();
 136
 137                 /* init_status stores the failure reason but we need to
 138                    return success or else idmap_init() will drop us from the
 139                    backend list */
 140                 return NT_STATUS_OK;
 141         }
 142
 143         init_status = NT_STATUS_OK;
 144
 145         return init_status;
 146 }
 147
 148 /**********************************************************************
 149  *********************************************************************/
 150
 151 static NTSTATUS _idmap_adex_get_sid_from_id(struct
 152                                                 idmap_domain
 153                                                 *dom, struct
 154                                                 id_map
 155                                                 **ids)
 156 {
 157         int i;
 158         bool one_mapped = false;
 159         bool all_mapped = true;
 160         NTSTATUS nt_status;
 161         struct likewise_cell *cell;
 162
 163         /* initialize the status to avoid suprise */
 164         for (i = 0; ids[i]; i++) {
 165                 ids[i]->status = ID_UNKNOWN;
 166         }
 167
 168         nt_status = _idmap_adex_init(dom);
 169         if (!NT_STATUS_IS_OK(nt_status))
 170                 return nt_status;
 171
 172         if ((cell = cell_list_head()) == NULL) {
 173                 return NT_STATUS_INVALID_SERVER_STATE;
 174         }
 175
 176         /* have to work through these one by one */
 177         for (i = 0; ids[i]; i++) {
 178                 NTSTATUS status;
 179                 status = cell->provider->get_sid_from_id(ids[i]->sid,
 180                                                          ids[i]->xid.id,
 181                                                          ids[i]->xid.type);
 182                 /* Fail if we cannot find any DC */
 183                 if (NT_STATUS_EQUAL
 184                     (status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
 185                         return status;
 186                 }
 187
 188                 if (!NT_STATUS_IS_OK(status)) {
 189                         ids[i]->status = ID_UNMAPPED;
 190                         all_mapped = false;
 191                         continue;
 192                 }
 193
 194                 ids[i]->status = ID_MAPPED;
 195                 one_mapped = true;
 196         }
 197
 198         return NT_STATUS_OK;
 199 }
 200
 201 /**********************************************************************
 202  *********************************************************************/
 203
 204 static NTSTATUS _idmap_adex_get_id_from_sid(struct
 205                                                 idmap_domain
 206                                                 *dom, struct
 207                                                 id_map
 208                                                 **ids)
 209 {
 210         int i;
 211         bool one_mapped = false;
 212         bool all_mapped = true;
 213         NTSTATUS nt_status;
 214         struct likewise_cell *cell;
 215
 216         /* initialize the status to avoid suprise */
 217         for (i = 0; ids[i]; i++) {
 218                 ids[i]->status = ID_UNKNOWN;
 219         }
 220
 221         nt_status = _idmap_adex_init(dom);
 222         if (!NT_STATUS_IS_OK(nt_status))
 223                 return nt_status;
 224
 225         if ((cell = cell_list_head()) == NULL) {
 226                 return NT_STATUS_INVALID_SERVER_STATE;
 227         }
 228
 229         /* have to work through these one by one */
 230         for (i = 0; ids[i]; i++) {
 231                 NTSTATUS status;
 232                 status = cell->provider->get_id_from_sid(&ids[i]->xid.id,
 233                                                          &ids[i]->xid.
 234                                                          type, ids[i]->sid);
 235                 /* Fail if we cannot find any DC */
 236                 if (NT_STATUS_EQUAL
 237                     (status, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND)) {
 238                         return status;
 239                 }
 240
 241                 if (!NT_STATUS_IS_OK(status)) {
 242                         ids[i]->status = ID_UNMAPPED;
 243                         all_mapped = false;
 244                         continue;
 245                 }
 246
 247                 ids[i]->status = ID_MAPPED;
 248                 one_mapped = true;
 249         }
 250
 251         return NT_STATUS_OK;
 252 }
 253
 254 /*
 255  * IdMap NSS plugin
 256  */
 257
 258 /**********************************************************************
 259  *********************************************************************/
 260
 261 static NTSTATUS _nss_adex_init(struct nss_domain_entry
 262                                   *e)
 263 {
 264         return _idmap_adex_init(NULL);
 265 }
 266
 267 /**********************************************************************
 268  *********************************************************************/
 269
 270 static NTSTATUS _nss_adex_get_info(struct
 271                                       nss_domain_entry *e,
 272                                       const struct dom_sid * sid,
 273                                       TALLOC_CTX * ctx,
 274                                       const char **homedir,
 275                                       const char **shell,
 276                                       const char **gecos, gid_t * p_gid)
 277 {
 278         NTSTATUS nt_status;
 279         struct likewise_cell *cell;
 280
 281         nt_status = _idmap_adex_init(NULL);
 282         if (!NT_STATUS_IS_OK(nt_status))
 283                 return nt_status;
 284
 285         if ((cell = cell_list_head()) == NULL) {
 286                 return NT_STATUS_INVALID_SERVER_STATE;
 287         }
 288
 289         return cell->provider->get_nss_info(sid, ctx, homedir,
 290                                             shell, gecos, p_gid);
 291 }
 292
 293 /**********************************************************************
 294  *********************************************************************/
 295
 296 static NTSTATUS _nss_adex_map_to_alias(TALLOC_CTX * mem_ctx,
 297                                        struct nss_domain_entry *e,
 298                                        const char *name, char **alias)
 299 {
 300         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 301         struct likewise_cell *cell = NULL;
 302
 303         nt_status = _idmap_adex_init(NULL);
 304         BAIL_ON_NTSTATUS_ERROR(nt_status);
 305
 306         if ((cell = cell_list_head()) == NULL) {
 307                 nt_status = NT_STATUS_INVALID_SERVER_STATE;
 308                 BAIL_ON_NTSTATUS_ERROR(nt_status);
 309         }
 310
 311         nt_status = cell->provider->map_to_alias(mem_ctx, e->domain,
 312                                                  name, alias);
 313
 314         /* go ahead and allow the cache mgr to mark this in
 315            negative cache */
 316
 317         if (!NT_STATUS_IS_OK(nt_status))
 318                 nt_status = NT_STATUS_NONE_MAPPED;
 319
 320 done:
 321         return nt_status;
 322 }
 323
 324 /**********************************************************************
 325  *********************************************************************/
 326
 327 static NTSTATUS _nss_adex_map_from_alias(TALLOC_CTX * mem_ctx,
 328                                          struct nss_domain_entry *e,
 329                                          const char *alias, char **name)
 330 {
 331         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 332         struct likewise_cell *cell = NULL;
 333
 334         nt_status = _idmap_adex_init(NULL);
 335         BAIL_ON_NTSTATUS_ERROR(nt_status);
 336
 337         if ((cell = cell_list_head()) == NULL) {
 338                 nt_status = NT_STATUS_INVALID_SERVER_STATE;
 339                 BAIL_ON_NTSTATUS_ERROR(nt_status);
 340         }
 341
 342
 343         nt_status = cell->provider->map_from_alias(mem_ctx, e->domain,
 344                                                    alias, name);
 345
 346         /* go ahead and allow the cache mgr to mark this in
 347            negative cache */
 348
 349         if (!NT_STATUS_IS_OK(nt_status))
 350                 nt_status = NT_STATUS_NONE_MAPPED;
 351
 352 done:
 353         return nt_status;
 354 }
 355
 356 /**********************************************************************
 357  *********************************************************************/
 358
 359 static NTSTATUS _nss_adex_close(void)
 360 {
 361         return NT_STATUS_NOT_IMPLEMENTED;
 362 }
 363
 364 /**********************************************************************
 365  *********************************************************************/
 366
 367 static struct idmap_methods adex_idmap_methods = {
 368
 369         .init             = _idmap_adex_init,
 370         .unixids_to_sids  = _idmap_adex_get_sid_from_id,
 371         .sids_to_unixids  = _idmap_adex_get_id_from_sid,
 372 };
 373 static struct nss_info_methods adex_nss_methods = {
 374         .init           = _nss_adex_init,
 375         .get_nss_info   = _nss_adex_get_info,
 376         .map_to_alias   = _nss_adex_map_to_alias,
 377         .map_from_alias = _nss_adex_map_from_alias,
 378         .close_fn       = _nss_adex_close
 379 };
 380
 381 /**********************************************************************
 382  Register with the idmap and idmap_nss subsystems. We have to protect
 383  against the idmap and nss_info interfaces being in a half-registered
 384  state.
 385  **********************************************************************/
 386 NTSTATUS samba_init_module(void)
 387 {
 388         static NTSTATUS idmap_status = NT_STATUS_UNSUCCESSFUL;
 389         static NTSTATUS nss_status = NT_STATUS_UNSUCCESSFUL;
 390         if (!NT_STATUS_IS_OK(idmap_status)) {
 391                 idmap_status =
 392                     smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION,
 393                                        "adex", &adex_idmap_methods);
 394                 if (!NT_STATUS_IS_OK(idmap_status)) {
 395                         DEBUG(0,
 396                               ("idmap_centeris_init: Failed to register the adex"
 397                                "idmap plugin.\n"));
 398                         return idmap_status;
 399                 }
 400         }
 401
 402         if (!NT_STATUS_IS_OK(nss_status)) {
 403                 nss_status =
 404                     smb_register_idmap_nss(SMB_NSS_INFO_INTERFACE_VERSION,
 405                                            "adex", &adex_nss_methods);
 406                 if (!NT_STATUS_IS_OK(nss_status)) {
 407                         DEBUG(0,
 408                               ("idmap_adex_init: Failed to register the adex"
 409                                "nss plugin.\n"));
 410                         return nss_status;
 411                 }
 412         }
 413
 414         return NT_STATUS_OK;
 415 }