source/nsswitch/idmap_rid.c

   1 /*
   2  *  idmap_rid: static map between Active Directory/NT RIDs and RFC 2307 accounts
   3  *  Copyright (C) Guenther Deschner, 2004
   4  *  Copyright (C) Sumit Bose, 2004
   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
  22 #include "includes.h"
  23 #include "winbindd.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_IDMAP
  27
  28 struct idmap_rid_context {
  29         const char *domain_name;
  30         uint32_t low_id;
  31         uint32_t high_id;
  32         uint32_t base_rid;
  33 };
  34
  35 /******************************************************************************
  36   compat params can't be used because of the completely different way
  37   we support multiple domains in the new idmap
  38  *****************************************************************************/
  39
  40 static NTSTATUS idmap_rid_initialize(struct idmap_domain *dom, const char *compat_params)
  41 {
  42         NTSTATUS ret;
  43         struct idmap_rid_context *ctx;
  44         char *config_option = NULL;
  45         const char *range;
  46
  47         if ( (ctx = talloc_zero(dom, struct idmap_rid_context)) == NULL ) {
  48                 DEBUG(0, ("Out of memory!\n"));
  49                 return NT_STATUS_NO_MEMORY;
  50         }
  51
  52         config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
  53         if ( ! config_option) {
  54                 DEBUG(0, ("Out of memory!\n"));
  55                 ret = NT_STATUS_NO_MEMORY;
  56                 goto failed;
  57         }
  58
  59         range = lp_parm_const_string(-1, config_option, "range", NULL);
  60         if ( !range ||
  61             (sscanf(range, "%u - %u", &ctx->low_id, &ctx->high_id) != 2) ||
  62             (ctx->low_id > ctx->high_id))
  63         {
  64                 ctx->low_id = 0;
  65                 ctx->high_id = 0;
  66         }
  67
  68         if ( !ctx->low_id || !ctx->high_id ) {
  69                 DEBUG(1, ("ERROR: Invalid configuration, ID range missing\n"));
  70                 ret = NT_STATUS_UNSUCCESSFUL;
  71                 goto failed;
  72         }
  73
  74         ctx->base_rid = lp_parm_int(-1, config_option, "base_rid", 0);
  75         ctx->domain_name = talloc_strdup( ctx, dom->name );
  76
  77         dom->private_data = ctx;
  78
  79         talloc_free(config_option);
  80         return NT_STATUS_OK;
  81
  82 failed:
  83         talloc_free(ctx);
  84         return ret;
  85 }
  86
  87 static NTSTATUS idmap_rid_id_to_sid(TALLOC_CTX *memctx, struct idmap_rid_context *ctx, struct id_map *map)
  88 {
  89         const char *domname, *name;
  90         enum lsa_SidType sid_type;
  91         BOOL ret;
  92         struct winbindd_domain *domain;
  93
  94         /* apply filters before checking */
  95         if ((map->xid.id < ctx->low_id) || (map->xid.id > ctx->high_id)) {
  96                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
  97                                 map->xid.id, ctx->low_id, ctx->high_id));
  98                 return NT_STATUS_NONE_MAPPED;
  99         }
 100
 101         if ( (domain = find_domain_from_name_noinit(ctx->domain_name)) == NULL ) {
 102                 return NT_STATUS_NO_SUCH_DOMAIN;
 103         }
 104
 105         sid_compose(map->sid, &domain->sid, map->xid.id - ctx->low_id + ctx->base_rid);
 106
 107         /* by default calls to winbindd are disabled
 108            the following call will not recurse so this is safe */
 109         winbind_on();
 110         ret = winbind_lookup_sid(memctx, map->sid, &domname, &name, &sid_type);
 111         winbind_off();
 112
 113         if (ret) {
 114                 switch (sid_type) {
 115                 case SID_NAME_USER:
 116                         if (map->xid.type != ID_TYPE_UID) {
 117                                 /* wrong type */
 118                                 map->status = ID_UNMAPPED;
 119                                 DEBUG(5, ("Resulting SID is of wrong ID type\n"));
 120                                 return NT_STATUS_NONE_MAPPED;
 121                         }
 122                         break;
 123                 case SID_NAME_DOM_GRP:
 124                 case SID_NAME_ALIAS:
 125                 case SID_NAME_WKN_GRP:
 126                         if (map->xid.type != ID_TYPE_GID) {
 127                                 /* wrong type */
 128                                 map->status = ID_UNMAPPED;
 129                                 DEBUG(5, ("Resulting SID is of wrong ID type\n"));
 130                                 return NT_STATUS_NONE_MAPPED;
 131                         }
 132                         break;
 133                 default:
 134                         /* invalid sid?? */
 135                         map->status = ID_UNKNOWN;
 136                         DEBUG(10, ("SID %s is UNKNOWN, skip mapping\n", sid_string_static(map->sid)));
 137                         return NT_STATUS_NONE_MAPPED;
 138                 }
 139         } else {
 140                 /* TODO: how do we known if the lookup was negative
 141                  * or something just failed? */
 142                 map->status = ID_UNMAPPED;
 143                 DEBUG(2, ("Failed: to resolve SID\n"));
 144                 return NT_STATUS_UNSUCCESSFUL;
 145         }
 146
 147         map->status = ID_MAPPED;
 148
 149         return NT_STATUS_OK;
 150 }
 151
 152 /**********************************
 153  Single sid to id lookup function.
 154 **********************************/
 155
 156 static NTSTATUS idmap_rid_sid_to_id(TALLOC_CTX *memctx, struct idmap_rid_context *ctx, struct id_map *map)
 157 {
 158         const char *domname, *name;
 159         enum lsa_SidType sid_type;
 160         uint32_t rid;
 161         BOOL ret;
 162
 163         sid_peek_rid(map->sid, &rid);
 164         map->xid.id = rid - ctx->base_rid + ctx->low_id;
 165
 166         /* by default calls to winbindd are disabled
 167            the following call will not recurse so this is safe */
 168         winbind_on();
 169         /* check if this is a valid SID and set the type */
 170         ret = winbind_lookup_sid(memctx, map->sid, &domname, &name, &sid_type);
 171         winbind_off();
 172
 173         if (ret) {
 174                 switch (sid_type) {
 175                 case SID_NAME_USER:
 176                         map->xid.type = ID_TYPE_UID;
 177                         break;
 178                 case SID_NAME_DOM_GRP:
 179                 case SID_NAME_ALIAS:
 180                 case SID_NAME_WKN_GRP:
 181                         map->xid.type = ID_TYPE_GID;
 182                         break;
 183                 default:
 184                         /* invalid sid, let's just leave it unmapped */
 185                         DEBUG(10, ("SID %s is UNKNOWN, skip mapping\n", sid_string_static(map->sid)));
 186                         map->status = ID_UNKNOWN;
 187                         return NT_STATUS_NONE_MAPPED;
 188                 }
 189         } else {
 190                 /* TODO: how do we known if the lookup was negative
 191                  * or something just failed? */
 192                 map->status = ID_UNMAPPED;
 193                 DEBUG(2, ("Failed: to resolve SID\n"));
 194                 return NT_STATUS_UNSUCCESSFUL;
 195         }
 196
 197         /* apply filters before returning result */
 198         if ((map->xid.id < ctx->low_id) || (map->xid.id > ctx->high_id)) {
 199                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 200                                 map->xid.id, ctx->low_id, ctx->high_id));
 201                 map->status = ID_UNMAPPED;
 202                 return NT_STATUS_NONE_MAPPED;
 203         }
 204
 205         map->status = ID_MAPPED;
 206
 207         return NT_STATUS_OK;
 208 }
 209
 210 /**********************************
 211  lookup a set of unix ids.
 212 **********************************/
 213
 214 static NTSTATUS idmap_rid_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
 215 {
 216         struct idmap_rid_context *ridctx;
 217         TALLOC_CTX *ctx;
 218         NTSTATUS ret;
 219         int i;
 220
 221         ridctx = talloc_get_type(dom->private_data, struct idmap_rid_context);
 222
 223         ctx = talloc_new(dom);
 224         if ( ! ctx) {
 225                 DEBUG(0, ("Out of memory!\n"));
 226                 return NT_STATUS_NO_MEMORY;
 227         }
 228
 229         for (i = 0; ids[i]; i++) {
 230
 231                 ret = idmap_rid_id_to_sid(ctx, ridctx, ids[i]);
 232
 233                 if (( ! NT_STATUS_IS_OK(ret)) &&
 234                     ( ! NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 235                         /* some fatal error occurred, log it */
 236                         DEBUG(3, ("Unexpected error resolving an ID (%d)\n", ids[i]->xid.id));
 237                 }
 238         }
 239
 240         talloc_free(ctx);
 241         return NT_STATUS_OK;
 242 }
 243
 244 /**********************************
 245  lookup a set of sids.
 246 **********************************/
 247
 248 static NTSTATUS idmap_rid_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 249 {
 250         struct idmap_rid_context *ridctx;
 251         TALLOC_CTX *ctx;
 252         NTSTATUS ret;
 253         int i;
 254
 255         ridctx = talloc_get_type(dom->private_data, struct idmap_rid_context);
 256
 257         ctx = talloc_new(dom);
 258         if ( ! ctx) {
 259                 DEBUG(0, ("Out of memory!\n"));
 260                 return NT_STATUS_NO_MEMORY;
 261         }
 262
 263         for (i = 0; ids[i]; i++) {
 264
 265                 ret = idmap_rid_sid_to_id(ctx, ridctx, ids[i]);
 266
 267                 if (( ! NT_STATUS_IS_OK(ret)) &&
 268                     ( ! NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 269                         /* some fatal error occurred, log it */
 270                         DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
 271                                         sid_string_static(ids[i]->sid)));
 272                 }
 273         }
 274
 275         talloc_free(ctx);
 276         return NT_STATUS_OK;
 277 }
 278
 279 static NTSTATUS idmap_rid_close(struct idmap_domain *dom)
 280 {
 281         if (dom->private_data) {
 282                 TALLOC_FREE(dom->private_data);
 283         }
 284         return NT_STATUS_OK;
 285 }
 286
 287 static struct idmap_methods rid_methods = {
 288         .init = idmap_rid_initialize,
 289         .unixids_to_sids = idmap_rid_unixids_to_sids,
 290         .sids_to_unixids = idmap_rid_sids_to_unixids,
 291         .close_fn = idmap_rid_close
 292 };
 293
 294 NTSTATUS idmap_rid_init(void)
 295 {
 296         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "rid", &rid_methods);
 297 }
 298