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)
  41 {
  42         NTSTATUS ret;
  43         struct idmap_rid_context *ctx;
  44         char *config_option = NULL;
  45         const char *range;
  46         uid_t low_uid = 0;
  47         uid_t high_uid = 0;
  48         gid_t low_gid = 0;
  49         gid_t high_gid = 0;
  50
  51         if ( (ctx = TALLOC_ZERO_P(dom, struct idmap_rid_context)) == NULL ) {
  52                 DEBUG(0, ("Out of memory!\n"));
  53                 return NT_STATUS_NO_MEMORY;
  54         }
  55
  56         config_option = talloc_asprintf(ctx, "idmap config %s", dom->name);
  57         if ( ! config_option) {
  58                 DEBUG(0, ("Out of memory!\n"));
  59                 ret = NT_STATUS_NO_MEMORY;
  60                 goto failed;
  61         }
  62
  63         range = lp_parm_const_string(-1, config_option, "range", NULL);
  64         if ( !range ||
  65             (sscanf(range, "%u - %u", &ctx->low_id, &ctx->high_id) != 2) ||
  66             (ctx->low_id > ctx->high_id))
  67         {
  68                 ctx->low_id = 0;
  69                 ctx->high_id = 0;
  70         }
  71
  72         /* lets see if the range is defined by the old idmap uid/idmap gid */
  73         if (!ctx->low_id && !ctx->high_id) {
  74                 if (lp_idmap_uid(&low_uid, &high_uid)) {
  75                         ctx->low_id = low_uid;
  76                         ctx->high_id = high_uid;
  77                 }
  78
  79                 if (lp_idmap_gid(&low_gid, &high_gid)) {
  80                         if ((ctx->low_id != low_gid) ||
  81                             (ctx->high_id != high_uid)) {
  82                                 DEBUG(1, ("ERROR: idmap uid irange must match idmap gid range\n"));
  83                                 ret = NT_STATUS_UNSUCCESSFUL;
  84                                 goto failed;
  85                         }
  86                 }
  87         }
  88
  89         if (!ctx->low_id || !ctx->high_id) {
  90                 DEBUG(1, ("ERROR: Invalid configuration, ID range missing or invalid\n"));
  91                 ret = NT_STATUS_UNSUCCESSFUL;
  92                 goto failed;
  93         }
  94
  95         ctx->base_rid = lp_parm_int(-1, config_option, "base_rid", 0);
  96         ctx->domain_name = talloc_strdup( ctx, dom->name );
  97
  98         dom->private_data = ctx;
  99         dom->initialized = True;
 100
 101         talloc_free(config_option);
 102         return NT_STATUS_OK;
 103
 104 failed:
 105         talloc_free(ctx);
 106         return ret;
 107 }
 108
 109 static NTSTATUS idmap_rid_id_to_sid(TALLOC_CTX *memctx, struct idmap_rid_context *ctx, struct id_map *map)
 110 {
 111         struct winbindd_domain *domain;
 112
 113         /* apply filters before checking */
 114         if ((map->xid.id < ctx->low_id) || (map->xid.id > ctx->high_id)) {
 115                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 116                                 map->xid.id, ctx->low_id, ctx->high_id));
 117                 return NT_STATUS_NONE_MAPPED;
 118         }
 119
 120         if ( (domain = find_domain_from_name_noinit(ctx->domain_name)) == NULL ) {
 121                 return NT_STATUS_NO_SUCH_DOMAIN;
 122         }
 123
 124         sid_compose(map->sid, &domain->sid, map->xid.id - ctx->low_id + ctx->base_rid);
 125
 126         /* We **really** should have some way of validating
 127            the SID exists and is the correct type here.  But
 128            that is a deficiency in the idmap_rid design. */
 129
 130         map->status = ID_MAPPED;
 131
 132         return NT_STATUS_OK;
 133 }
 134
 135 /**********************************
 136  Single sid to id lookup function.
 137 **********************************/
 138
 139 static NTSTATUS idmap_rid_sid_to_id(TALLOC_CTX *memctx, struct idmap_rid_context *ctx, struct id_map *map)
 140 {
 141         uint32_t rid;
 142
 143         sid_peek_rid(map->sid, &rid);
 144         map->xid.id = rid - ctx->base_rid + ctx->low_id;
 145
 146         /* apply filters before returning result */
 147
 148         if ((map->xid.id < ctx->low_id) || (map->xid.id > ctx->high_id)) {
 149                 DEBUG(5, ("Requested id (%u) out of range (%u - %u). Filtered!\n",
 150                                 map->xid.id, ctx->low_id, ctx->high_id));
 151                 map->status = ID_UNMAPPED;
 152                 return NT_STATUS_NONE_MAPPED;
 153         }
 154
 155         /* We **really** should have some way of validating
 156            the SID exists and is the correct type here.  But
 157            that is a deficiency in the idmap_rid design. */
 158
 159         map->status = ID_MAPPED;
 160
 161         return NT_STATUS_OK;
 162 }
 163
 164 /**********************************
 165  lookup a set of unix ids.
 166 **********************************/
 167
 168 static NTSTATUS idmap_rid_unixids_to_sids(struct idmap_domain *dom, struct id_map **ids)
 169 {
 170         struct idmap_rid_context *ridctx;
 171         TALLOC_CTX *ctx;
 172         NTSTATUS ret;
 173         int i;
 174
 175         /* Initilization my have been deferred because of an error, retry or fail */
 176         if ( ! dom->initialized) {
 177                 ret = idmap_rid_initialize(dom);
 178                 if ( ! NT_STATUS_IS_OK(ret)) {
 179                         return ret;
 180                 }
 181         }
 182
 183         ridctx = talloc_get_type(dom->private_data, struct idmap_rid_context);
 184
 185         ctx = talloc_new(dom);
 186         if ( ! ctx) {
 187                 DEBUG(0, ("Out of memory!\n"));
 188                 return NT_STATUS_NO_MEMORY;
 189         }
 190
 191         for (i = 0; ids[i]; i++) {
 192
 193                 ret = idmap_rid_id_to_sid(ctx, ridctx, ids[i]);
 194
 195                 if (( ! NT_STATUS_IS_OK(ret)) &&
 196                     ( ! NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 197                         /* some fatal error occurred, log it */
 198                         DEBUG(3, ("Unexpected error resolving an ID (%d)\n", ids[i]->xid.id));
 199                 }
 200         }
 201
 202         talloc_free(ctx);
 203         return NT_STATUS_OK;
 204 }
 205
 206 /**********************************
 207  lookup a set of sids.
 208 **********************************/
 209
 210 static NTSTATUS idmap_rid_sids_to_unixids(struct idmap_domain *dom, struct id_map **ids)
 211 {
 212         struct idmap_rid_context *ridctx;
 213         TALLOC_CTX *ctx;
 214         NTSTATUS ret;
 215         int i;
 216
 217         /* Initilization my have been deferred because of an error, retry or fail */
 218         if ( ! dom->initialized) {
 219                 ret = idmap_rid_initialize(dom);
 220                 if ( ! NT_STATUS_IS_OK(ret)) {
 221                         return ret;
 222                 }
 223         }
 224
 225         ridctx = talloc_get_type(dom->private_data, struct idmap_rid_context);
 226
 227         ctx = talloc_new(dom);
 228         if ( ! ctx) {
 229                 DEBUG(0, ("Out of memory!\n"));
 230                 return NT_STATUS_NO_MEMORY;
 231         }
 232
 233         for (i = 0; ids[i]; i++) {
 234
 235                 ret = idmap_rid_sid_to_id(ctx, ridctx, ids[i]);
 236
 237                 if (( ! NT_STATUS_IS_OK(ret)) &&
 238                     ( ! NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED))) {
 239                         /* some fatal error occurred, log it */
 240                         DEBUG(3, ("Unexpected error resolving a SID (%s)\n",
 241                                         sid_string_static(ids[i]->sid)));
 242                 }
 243         }
 244
 245         talloc_free(ctx);
 246         return NT_STATUS_OK;
 247 }
 248
 249 static NTSTATUS idmap_rid_close(struct idmap_domain *dom)
 250 {
 251         if (dom->private_data) {
 252                 TALLOC_FREE(dom->private_data);
 253         }
 254         return NT_STATUS_OK;
 255 }
 256
 257 static struct idmap_methods rid_methods = {
 258         .init = idmap_rid_initialize,
 259         .unixids_to_sids = idmap_rid_unixids_to_sids,
 260         .sids_to_unixids = idmap_rid_sids_to_unixids,
 261         .close_fn = idmap_rid_close
 262 };
 263
 264 NTSTATUS idmap_rid_init(void)
 265 {
 266         return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "rid", &rid_methods);
 267 }
 268