source/lib/privileges.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Privileges handling functions
   4    Copyright (C) Jean François Micouleau        1998-2001
   5    Copyright (C) Simo Sorce                     2002-2003
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 /* defines */
  25
  26 #define ALLOC_CHECK(ptr, err, label, str) do { if ((ptr) == NULL) { DEBUG(0, ("%s: out of memory!\n", str)); err = NT_STATUS_NO_MEMORY; goto label; } } while(0)
  27 #define NTSTATUS_CHECK(err, label, str1, str2) do { if (!NT_STATUS_IS_OK(err)) { DEBUG(0, ("%s: %s failed!\n", str1, str2)); } } while(0)
  28
  29 /****************************************************************************
  30  Check if a user is a mapped group.
  31
  32    This function will check if the group SID is mapped onto a
  33    system managed gid or onto a winbind manged sid.
  34    In the first case it will be threated like a mapped group
  35    and the backend should take the member list with a getgrgid
  36    and ignore any user that have been possibly set into the group
  37    object.
  38
  39    In the second case, the group is a fully SAM managed group
  40    served back to the system through winbind. In this case the
  41    members of a Local group are "unrolled" to cope with the fact
  42    that unix cannot contain groups inside groups.
  43    The backend MUST never call any getgr* / getpw* function or
  44    loops with winbind may happen.
  45  ****************************************************************************/
  46
  47 #if 0
  48 NTSTATUS is_mapped_group(BOOL *mapped, const DOM_SID *sid)
  49 {
  50         NTSTATUS result;
  51         gid_t id;
  52
  53         /* look if mapping exist, do not make idmap alloc an uid if SID is not found */
  54         result = idmap_get_gid_from_sid(&id, sid, False);
  55         if (NT_STATUS_IS_OK(result)) {
  56                 *mapped = gid_is_in_winbind_range(id);
  57         } else {
  58                 *mapped = False;
  59         }
  60
  61         return result;
  62 }
  63 #endif
  64
  65 /****************************************************************************
  66  duplicate alloc luid_attr
  67  ****************************************************************************/
  68 NTSTATUS dupalloc_luid_attr(TALLOC_CTX *mem_ctx, LUID_ATTR **new_la, LUID_ATTR *old_la)
  69 {
  70         NTSTATUS ret;
  71
  72         *new_la = (LUID_ATTR *)talloc(mem_ctx, sizeof(LUID_ATTR));
  73         ALLOC_CHECK(new_la, ret, done, "dupalloc_luid_attr");
  74
  75         (*new_la)->luid.high = old_la->luid.high;
  76         (*new_la)->luid.low = old_la->luid.low;
  77         (*new_la)->attr = old_la->attr;
  78
  79         ret = NT_STATUS_OK;
  80
  81 done:
  82         return ret;
  83 }
  84
  85 /****************************************************************************
  86  initialise a privilege list
  87  ****************************************************************************/
  88 NTSTATUS init_privilege(PRIVILEGE_SET **priv_set)
  89 {
  90         NTSTATUS ret;
  91         TALLOC_CTX *mem_ctx = talloc_init("privilege set");
  92         ALLOC_CHECK(mem_ctx, ret, done, "init_privilege");
  93
  94         *priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
  95         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
  96
  97         (*priv_set)->mem_ctx = mem_ctx;
  98
  99         ret = NT_STATUS_OK;
 100
 101 done:
 102         return ret;
 103 }
 104
 105 NTSTATUS init_priv_with_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **priv_set)
 106 {
 107         NTSTATUS ret;
 108
 109         *priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
 110         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
 111
 112         (*priv_set)->mem_ctx = mem_ctx;
 113         (*priv_set)->ext_ctx = True;
 114
 115         ret = NT_STATUS_OK;
 116
 117 done:
 118         return ret;
 119 }
 120
 121 void reset_privilege(PRIVILEGE_SET *priv_set)
 122 {
 123         priv_set->count = 0;
 124         priv_set->control = 0;
 125         priv_set->set = NULL;
 126 }
 127
 128 void destroy_privilege(PRIVILEGE_SET **priv_set)
 129 {
 130         reset_privilege(*priv_set);
 131         if (!((*priv_set)->ext_ctx))
 132                 /* mem_ctx is local, destroy it */
 133                 talloc_destroy((*priv_set)->mem_ctx);
 134         *priv_set = NULL;
 135 }
 136
 137 /****************************************************************************
 138  add a privilege to a privilege array
 139  ****************************************************************************/
 140 NTSTATUS add_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 141 {
 142         NTSTATUS ret;
 143         LUID_ATTR *new_set;
 144
 145         /* check if the privilege is not already in the list */
 146         if (NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 147                 return NT_STATUS_UNSUCCESSFUL;
 148
 149         /* we can allocate memory to add the new privilege */
 150
 151         new_set = (LUID_ATTR *)talloc_realloc(priv_set->mem_ctx, priv_set->set, (priv_set->count + 1) * (sizeof(LUID_ATTR)));
 152         ALLOC_CHECK(new_set, ret, done, "add_privilege");
 153
 154         new_set[priv_set->count].luid.high = set.luid.high;
 155         new_set[priv_set->count].luid.low = set.luid.low;
 156         new_set[priv_set->count].attr = set.attr;
 157
 158         priv_set->count++;
 159         priv_set->set = new_set;
 160
 161         ret = NT_STATUS_OK;
 162
 163 done:
 164         return ret;
 165 }
 166
 167 /****************************************************************************
 168  add all the privileges to a privilege array
 169  ****************************************************************************/
 170 NTSTATUS add_all_privilege(PRIVILEGE_SET *priv_set)
 171 {
 172         NTSTATUS result = NT_STATUS_OK;
 173         LUID_ATTR set;
 174
 175         set.attr = 0;
 176         set.luid.high = 0;
 177
 178         /* TODO: set a proper list of privileges */
 179         set.luid.low = SE_PRIV_ADD_USERS;
 180         result = add_privilege(priv_set, set);
 181         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 182
 183         set.luid.low = SE_PRIV_ADD_MACHINES;
 184         result = add_privilege(priv_set, set);
 185         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 186
 187         set.luid.low = SE_PRIV_PRINT_OPERATOR;
 188         result = add_privilege(priv_set, set);
 189         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 190
 191 done:
 192         return result;
 193 }
 194
 195 /****************************************************************************
 196  check if the privilege list is empty
 197  ****************************************************************************/
 198 NTSTATUS check_empty_privilege(PRIVILEGE_SET *priv_set)
 199 {
 200         if (!priv_set)
 201                 return NT_STATUS_INVALID_PARAMETER;
 202
 203         if (priv_set->count == 0)
 204                 return NT_STATUS_OK;
 205
 206         return NT_STATUS_UNSUCCESSFUL;
 207 }
 208
 209 /****************************************************************************
 210  check if the privilege is in the privilege list
 211  ****************************************************************************/
 212 NTSTATUS check_priv_in_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 213 {
 214         int i;
 215
 216         if (!priv_set)
 217                 return NT_STATUS_INVALID_PARAMETER;
 218
 219         /* if the list is empty, obviously we can't have it */
 220         if (NT_STATUS_IS_OK(check_empty_privilege(priv_set)))
 221                 return NT_STATUS_UNSUCCESSFUL;
 222
 223         for (i = 0; i < priv_set->count; i++) {
 224                 LUID_ATTR *cur_set;
 225
 226                 cur_set = &priv_set->set[i];
 227                 /* check only the low and high part. Checking the attr field has no meaning */
 228                 if (    (cur_set->luid.low == set.luid.low) &&
 229                         (cur_set->luid.high == set.luid.high)   ) {
 230                         return NT_STATUS_OK;
 231                 }
 232         }
 233
 234         return NT_STATUS_UNSUCCESSFUL;
 235 }
 236
 237 /****************************************************************************
 238  remove a privilege from a privilege array
 239  ****************************************************************************/
 240 NTSTATUS remove_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 241 {
 242         NTSTATUS ret;
 243         LUID_ATTR *new_set;
 244         LUID_ATTR *old_set;
 245         int i,j;
 246
 247         if (!priv_set)
 248                 return NT_STATUS_INVALID_PARAMETER;
 249
 250         /* check if the privilege is in the list */
 251         if (!NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 252                 return NT_STATUS_UNSUCCESSFUL;
 253
 254         /* special case if it's the only privilege in the list */
 255         if (priv_set->count == 1) {
 256                 reset_privilege(priv_set);
 257                 return NT_STATUS_OK;
 258         }
 259
 260         /*
 261          * the privilege is there, create a new list,
 262          * and copy the other privileges
 263          */
 264
 265         old_set = priv_set->set;
 266
 267         new_set = (LUID_ATTR *)talloc(priv_set->mem_ctx, (priv_set->count - 1) * (sizeof(LUID_ATTR)));
 268         ALLOC_CHECK(new_set, ret, done, "remove_privilege");
 269
 270         for (i=0, j=0; i < priv_set->count; i++) {
 271                 if (    (old_set[i].luid.low == set.luid.low) &&
 272                         (old_set[i].luid.high == set.luid.high) ) {
 273                         continue;
 274                 }
 275
 276                 new_set[j].luid.low = old_set[i].luid.low;
 277                 new_set[j].luid.high = old_set[i].luid.high;
 278                 new_set[j].attr = old_set[i].attr;
 279
 280                 j++;
 281         }
 282
 283         if (j != priv_set->count - 1) {
 284                 DEBUG(0,("remove_privilege: mismatch ! difference is not -1\n"));
 285                 DEBUGADD(0,("old count:%d, new count:%d\n", priv_set->count, j));
 286                 return NT_STATUS_INTERNAL_ERROR;
 287         }
 288
 289         /* ok everything is fine */
 290
 291         priv_set->count--;
 292         priv_set->set = new_set;
 293
 294         ret = NT_STATUS_OK;
 295
 296 done:
 297         return ret;
 298 }
 299
 300 /****************************************************************************
 301  duplicates a privilege array
 302  the new privilege set must be passed inited
 303  (use init_privilege or init_priv_with_ctx)
 304  ****************************************************************************/
 305 NTSTATUS dup_priv_set(PRIVILEGE_SET *new_priv_set, PRIVILEGE_SET *priv_set)
 306 {
 307         NTSTATUS ret;
 308         LUID_ATTR *new_set;
 309         LUID_ATTR *old_set;
 310         int i;
 311
 312         if (!new_priv_set || !priv_set)
 313                 return NT_STATUS_INVALID_PARAMETER;
 314
 315         /* special case if there are no privileges in the list */
 316         if (priv_set->count == 0) {
 317                 return NT_STATUS_OK;
 318         }
 319
 320         /*
 321          * create a new list,
 322          * and copy the other privileges
 323          */
 324
 325         old_set = priv_set->set;
 326
 327         new_set = (LUID_ATTR *)talloc(new_priv_set->mem_ctx, (priv_set->count - 1) * (sizeof(LUID_ATTR)));
 328         ALLOC_CHECK(new_set, ret, done, "dup_priv_set");
 329
 330         for (i=0; i < priv_set->count; i++) {
 331
 332                 new_set[i].luid.low = old_set[i].luid.low;
 333                 new_set[i].luid.high = old_set[i].luid.high;
 334                 new_set[i].attr = old_set[i].attr;
 335         }
 336
 337         new_priv_set->count = priv_set->count;
 338         new_priv_set->control = priv_set->control;
 339         new_priv_set->set = new_set;
 340
 341         ret = NT_STATUS_OK;
 342
 343 done:
 344         return ret;
 345 }