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         /* don't crash if the source pointer is NULL (since we don't
  73            do priviledges now anyways) */
  74
  75         if ( !old_la )
  76                 return NT_STATUS_OK;
  77
  78         *new_la = TALLOC_P(mem_ctx, LUID_ATTR);
  79         ALLOC_CHECK(new_la, ret, done, "dupalloc_luid_attr");
  80
  81         (*new_la)->luid.high = old_la->luid.high;
  82         (*new_la)->luid.low = old_la->luid.low;
  83         (*new_la)->attr = old_la->attr;
  84
  85         ret = NT_STATUS_OK;
  86
  87 done:
  88         return ret;
  89 }
  90
  91 /****************************************************************************
  92  initialise a privilege list
  93  ****************************************************************************/
  94 NTSTATUS init_privilege(PRIVILEGE_SET **priv_set)
  95 {
  96         NTSTATUS ret;
  97         TALLOC_CTX *mem_ctx = talloc_init("privilege set");
  98         ALLOC_CHECK(mem_ctx, ret, done, "init_privilege");
  99
 100         *priv_set = TALLOC_ZERO_P(mem_ctx, PRIVILEGE_SET);
 101         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
 102
 103         (*priv_set)->mem_ctx = mem_ctx;
 104
 105         ret = NT_STATUS_OK;
 106
 107 done:
 108         return ret;
 109 }
 110
 111 NTSTATUS init_priv_with_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **priv_set)
 112 {
 113         NTSTATUS ret;
 114
 115         *priv_set = TALLOC_ZERO_P(mem_ctx, PRIVILEGE_SET);
 116         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
 117
 118         (*priv_set)->mem_ctx = mem_ctx;
 119         (*priv_set)->ext_ctx = True;
 120
 121         ret = NT_STATUS_OK;
 122
 123 done:
 124         return ret;
 125 }
 126
 127 void reset_privilege(PRIVILEGE_SET *priv_set)
 128 {
 129         priv_set->count = 0;
 130         priv_set->control = 0;
 131         priv_set->set = NULL;
 132 }
 133
 134 void destroy_privilege(PRIVILEGE_SET **priv_set)
 135 {
 136         reset_privilege(*priv_set);
 137         if (!((*priv_set)->ext_ctx))
 138                 /* mem_ctx is local, destroy it */
 139                 talloc_destroy((*priv_set)->mem_ctx);
 140         *priv_set = NULL;
 141 }
 142
 143 /****************************************************************************
 144  add a privilege to a privilege array
 145  ****************************************************************************/
 146 NTSTATUS add_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 147 {
 148         NTSTATUS ret;
 149         LUID_ATTR *new_set;
 150
 151         /* check if the privilege is not already in the list */
 152         if (NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 153                 return NT_STATUS_UNSUCCESSFUL;
 154
 155         /* we can allocate memory to add the new privilege */
 156
 157         new_set = TALLOC_REALLOC_ARRAY(priv_set->mem_ctx, priv_set->set, LUID_ATTR, priv_set->count + 1);
 158         ALLOC_CHECK(new_set, ret, done, "add_privilege");
 159
 160         new_set[priv_set->count].luid.high = set.luid.high;
 161         new_set[priv_set->count].luid.low = set.luid.low;
 162         new_set[priv_set->count].attr = set.attr;
 163
 164         priv_set->count++;
 165         priv_set->set = new_set;
 166
 167         ret = NT_STATUS_OK;
 168
 169 done:
 170         return ret;
 171 }
 172
 173 /****************************************************************************
 174  add all the privileges to a privilege array
 175  ****************************************************************************/
 176 NTSTATUS add_all_privilege(PRIVILEGE_SET *priv_set)
 177 {
 178         NTSTATUS result = NT_STATUS_OK;
 179         LUID_ATTR set;
 180
 181         set.attr = 0;
 182         set.luid.high = 0;
 183
 184         /* TODO: set a proper list of privileges */
 185         set.luid.low = SE_PRIV_ADD_USERS;
 186         result = add_privilege(priv_set, set);
 187         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 188
 189         set.luid.low = SE_PRIV_ADD_MACHINES;
 190         result = add_privilege(priv_set, set);
 191         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 192
 193         set.luid.low = SE_PRIV_PRINT_OPERATOR;
 194         result = add_privilege(priv_set, set);
 195         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 196
 197         return result;
 198 }
 199
 200 /****************************************************************************
 201  check if the privilege list is empty
 202  ****************************************************************************/
 203 NTSTATUS check_empty_privilege(PRIVILEGE_SET *priv_set)
 204 {
 205         if (!priv_set)
 206                 return NT_STATUS_INVALID_PARAMETER;
 207
 208         if (priv_set->count == 0)
 209                 return NT_STATUS_OK;
 210
 211         return NT_STATUS_UNSUCCESSFUL;
 212 }
 213
 214 /****************************************************************************
 215  check if the privilege is in the privilege list
 216  ****************************************************************************/
 217 NTSTATUS check_priv_in_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 218 {
 219         int i;
 220
 221         if (!priv_set)
 222                 return NT_STATUS_INVALID_PARAMETER;
 223
 224         /* if the list is empty, obviously we can't have it */
 225         if (NT_STATUS_IS_OK(check_empty_privilege(priv_set)))
 226                 return NT_STATUS_UNSUCCESSFUL;
 227
 228         for (i = 0; i < priv_set->count; i++) {
 229                 LUID_ATTR *cur_set;
 230
 231                 cur_set = &priv_set->set[i];
 232                 /* check only the low and high part. Checking the attr field has no meaning */
 233                 if (    (cur_set->luid.low == set.luid.low) &&
 234                         (cur_set->luid.high == set.luid.high)   ) {
 235                         return NT_STATUS_OK;
 236                 }
 237         }
 238
 239         return NT_STATUS_UNSUCCESSFUL;
 240 }
 241
 242 /****************************************************************************
 243  remove a privilege from a privilege array
 244  ****************************************************************************/
 245 NTSTATUS remove_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 246 {
 247         NTSTATUS ret;
 248         LUID_ATTR *new_set;
 249         LUID_ATTR *old_set;
 250         int i,j;
 251
 252         if (!priv_set)
 253                 return NT_STATUS_INVALID_PARAMETER;
 254
 255         /* check if the privilege is in the list */
 256         if (!NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 257                 return NT_STATUS_UNSUCCESSFUL;
 258
 259         /* special case if it's the only privilege in the list */
 260         if (priv_set->count == 1) {
 261                 reset_privilege(priv_set);
 262                 return NT_STATUS_OK;
 263         }
 264
 265         /*
 266          * the privilege is there, create a new list,
 267          * and copy the other privileges
 268          */
 269
 270         old_set = priv_set->set;
 271
 272         new_set = TALLOC_ARRAY(priv_set->mem_ctx, LUID_ATTR, priv_set->count - 1);
 273         ALLOC_CHECK(new_set, ret, done, "remove_privilege");
 274
 275         for (i=0, j=0; i < priv_set->count; i++) {
 276                 if (    (old_set[i].luid.low == set.luid.low) &&
 277                         (old_set[i].luid.high == set.luid.high) ) {
 278                         continue;
 279                 }
 280
 281                 new_set[j].luid.low = old_set[i].luid.low;
 282                 new_set[j].luid.high = old_set[i].luid.high;
 283                 new_set[j].attr = old_set[i].attr;
 284
 285                 j++;
 286         }
 287
 288         if (j != priv_set->count - 1) {
 289                 DEBUG(0,("remove_privilege: mismatch ! difference is not -1\n"));
 290                 DEBUGADD(0,("old count:%d, new count:%d\n", priv_set->count, j));
 291                 return NT_STATUS_INTERNAL_ERROR;
 292         }
 293
 294         /* ok everything is fine */
 295
 296         priv_set->count--;
 297         priv_set->set = new_set;
 298
 299         ret = NT_STATUS_OK;
 300
 301 done:
 302         return ret;
 303 }
 304
 305 /****************************************************************************
 306  duplicates a privilege array
 307  the new privilege set must be passed inited
 308  (use init_privilege or init_priv_with_ctx)
 309  ****************************************************************************/
 310 NTSTATUS dup_priv_set(PRIVILEGE_SET *new_priv_set, PRIVILEGE_SET *priv_set)
 311 {
 312         NTSTATUS ret;
 313         LUID_ATTR *new_set;
 314         LUID_ATTR *old_set;
 315         int i;
 316
 317         if (!new_priv_set || !priv_set)
 318                 return NT_STATUS_INVALID_PARAMETER;
 319
 320         /* special case if there are no privileges in the list */
 321         if (priv_set->count == 0) {
 322                 return NT_STATUS_OK;
 323         }
 324
 325         /*
 326          * create a new list,
 327          * and copy the other privileges
 328          */
 329
 330         old_set = priv_set->set;
 331
 332         new_set = TALLOC_ARRAY(new_priv_set->mem_ctx, LUID_ATTR, priv_set->count - 1);
 333         ALLOC_CHECK(new_set, ret, done, "dup_priv_set");
 334
 335         for (i=0; i < priv_set->count; i++) {
 336
 337                 new_set[i].luid.low = old_set[i].luid.low;
 338                 new_set[i].luid.high = old_set[i].luid.high;
 339                 new_set[i].attr = old_set[i].attr;
 340         }
 341
 342         new_priv_set->count = priv_set->count;
 343         new_priv_set->control = priv_set->control;
 344         new_priv_set->set = new_set;
 345
 346         ret = NT_STATUS_OK;
 347
 348 done:
 349         return ret;
 350 }