source3/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 PRIVS privs[] = {
  31         {SE_NONE,                       "no_privs",                             "No privilege"}, /* this one MUST be first */
  32         {SE_CREATE_TOKEN,               "SeCreateTokenPrivilege",               "Create Token"},
  33         {SE_ASSIGN_PRIMARY_TOKEN,       "SeAssignPrimaryTokenPrivilege",        "Assign Primary Token"},
  34         {SE_LOCK_MEMORY,                "SeLockMemoryPrivilege",                "Lock Memory"},
  35         {SE_INCREASE_QUOTA,             "SeIncreaseQuotaPrivilege",             "Increase Quota"},
  36         {SE_UNSOLICITED_INPUT,          "SeUnsolicitedInputPrivilege",          "Unsolicited Input"},
  37         {SE_MACHINE_ACCOUNT,            "SeMachineAccountPrivilege",            "Can add Machine Accounts to the Domain"},
  38         {SE_TCB,                        "SeTcbPrivilege",                       "TCB"},
  39         {SE_SECURITY,                   "SeSecurityPrivilege",                  "Security Privilege"},
  40         {SE_TAKE_OWNERSHIP,             "SeTakeOwnershipPrivilege",             "Take Ownership Privilege"},
  41         {SE_LOAD_DRIVER,                "SeLocalDriverPrivilege",               "Local Driver Privilege"},
  42         {SE_SYSTEM_PROFILE,             "SeSystemProfilePrivilege",             "System Profile Privilege"},
  43         {SE_SYSTEM_TIME,                "SeSystemtimePrivilege",                "System Time"},
  44         {SE_PROF_SINGLE_PROCESS,        "SeProfileSingleProcessPrivilege",      "Profile Single Process Privilege"},
  45         {SE_INC_BASE_PRIORITY,          "SeIncreaseBasePriorityPrivilege",      "Increase Base Priority Privilege"},
  46         {SE_CREATE_PAGEFILE,            "SeCreatePagefilePrivilege",            "Create Pagefile Privilege"},
  47         {SE_CREATE_PERMANENT,           "SeCreatePermanentPrivilege",           "Create Permanent"},
  48         {SE_BACKUP,                     "SeBackupPrivilege",                    "Backup Privilege"},
  49         {SE_RESTORE,                    "SeRestorePrivilege",                   "Restore Privilege"},
  50         {SE_SHUTDOWN,                   "SeShutdownPrivilege",                  "Shutdown Privilege"},
  51         {SE_DEBUG,                      "SeDebugPrivilege",                     "Debug Privilege"},
  52         {SE_AUDIT,                      "SeAuditPrivilege",                     "Audit"},
  53         {SE_SYSTEM_ENVIRONMENT,         "SeSystemEnvironmentPrivilege",         "System Environment Privilege"},
  54         {SE_CHANGE_NOTIFY,              "SeChangeNotifyPrivilege",              "Change Notify"},
  55         {SE_REMOTE_SHUTDOWN,            "SeRemoteShutdownPrivilege",            "Remote Shutdown Privilege"},
  56         {SE_UNDOCK,                     "SeUndockPrivilege",                    "Undock"},
  57         {SE_SYNC_AGENT,                 "SeSynchronizationAgentPrivilege",      "Synchronization Agent"},
  58         {SE_ENABLE_DELEGATION,          "SeEnableDelegationPrivilege",          "Enable Delegation"},
  59         {SE_PRINT_OPERATOR,             "SePrintOperatorPrivilege",             "Printer Operator"},
  60         {SE_ADD_USERS,                  "SeAddUsersPrivilege",                  "Add Users"},
  61         {SE_ALL_PRIVS,                  "SeAllPrivileges",                      "All Privileges"}
  62 };
  63
  64
  65
  66 /****************************************************************************
  67  Check if a user is a mapped group.
  68
  69    This function will check if the group SID is mapped onto a
  70    system managed gid or onto a winbind manged sid.
  71    In the first case it will be threated like a mapped group
  72    and the backend should take the member list with a getgrgid
  73    and ignore any user that have been possibly set into the group
  74    object.
  75
  76    In the second case, the group is a fully SAM managed group
  77    served back to the system through winbind. In this case the
  78    members of a Local group are "unrolled" to cope with the fact
  79    that unix cannot contain groups inside groups.
  80    The backend MUST never call any getgr* / getpw* function or
  81    loops with winbind may happen.
  82  ****************************************************************************/
  83
  84 #if 0
  85 NTSTATUS is_mapped_group(BOOL *mapped, const DOM_SID *sid)
  86 {
  87         NTSTATUS result;
  88         gid_t id;
  89
  90         /* look if mapping exist, do not make idmap alloc an uid if SID is not found */
  91         result = idmap_get_gid_from_sid(&id, sid, False);
  92         if (NT_STATUS_IS_OK(result)) {
  93                 *mapped = gid_is_in_winbind_range(id);
  94         } else {
  95                 *mapped = False;
  96         }
  97
  98         return result;
  99 }
 100 #endif
 101
 102 /****************************************************************************
 103  duplicate alloc luid_attr
 104  ****************************************************************************/
 105 NTSTATUS dupalloc_luid_attr(TALLOC_CTX *mem_ctx, LUID_ATTR **new_la, LUID_ATTR *old_la)
 106 {
 107         NTSTATUS ret;
 108
 109         /* don't crash if the source pointer is NULL (since we don't
 110            do priviledges now anyways) */
 111
 112         if ( !old_la )
 113                 return NT_STATUS_OK;
 114
 115         *new_la = (LUID_ATTR *)talloc(mem_ctx, sizeof(LUID_ATTR));
 116         ALLOC_CHECK(new_la, ret, done, "dupalloc_luid_attr");
 117
 118         (*new_la)->luid.high = old_la->luid.high;
 119         (*new_la)->luid.low = old_la->luid.low;
 120         (*new_la)->attr = old_la->attr;
 121
 122         ret = NT_STATUS_OK;
 123
 124 done:
 125         return ret;
 126 }
 127
 128 /****************************************************************************
 129  initialise a privilege list
 130  ****************************************************************************/
 131 NTSTATUS init_privilege(PRIVILEGE_SET **priv_set)
 132 {
 133         NTSTATUS ret;
 134         TALLOC_CTX *mem_ctx = talloc_init("privilege set");
 135         ALLOC_CHECK(mem_ctx, ret, done, "init_privilege");
 136
 137         *priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
 138         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
 139
 140         (*priv_set)->mem_ctx = mem_ctx;
 141
 142         ret = NT_STATUS_OK;
 143
 144 done:
 145         return ret;
 146 }
 147
 148 NTSTATUS init_priv_with_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **priv_set)
 149 {
 150         NTSTATUS ret;
 151
 152         *priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
 153         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
 154
 155         (*priv_set)->mem_ctx = mem_ctx;
 156         (*priv_set)->ext_ctx = True;
 157
 158         ret = NT_STATUS_OK;
 159
 160 done:
 161         return ret;
 162 }
 163
 164 void reset_privilege(PRIVILEGE_SET *priv_set)
 165 {
 166         priv_set->count = 0;
 167         priv_set->control = 0;
 168         priv_set->set = NULL;
 169 }
 170
 171 void destroy_privilege(PRIVILEGE_SET **priv_set)
 172 {
 173         if (priv_set == NULL || *priv_set == NULL)
 174                 return;
 175
 176         reset_privilege(*priv_set);
 177         if (!((*priv_set)->ext_ctx))
 178                 /* mem_ctx is local, destroy it */
 179                 talloc_destroy((*priv_set)->mem_ctx);
 180         *priv_set = NULL;
 181 }
 182
 183 /****************************************************************************
 184  add a privilege to a privilege array
 185  ****************************************************************************/
 186 NTSTATUS add_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 187 {
 188         NTSTATUS ret;
 189         LUID_ATTR *new_set;
 190
 191         /* check if the privilege is not already in the list */
 192         if (NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 193                 return NT_STATUS_UNSUCCESSFUL;
 194
 195         /* we can allocate memory to add the new privilege */
 196
 197         new_set = (LUID_ATTR *)talloc_realloc(priv_set->mem_ctx, priv_set->set, (priv_set->count + 1) * (sizeof(LUID_ATTR)));
 198         ALLOC_CHECK(new_set, ret, done, "add_privilege");
 199
 200         new_set[priv_set->count].luid.high = set.luid.high;
 201         new_set[priv_set->count].luid.low = set.luid.low;
 202         new_set[priv_set->count].attr = set.attr;
 203
 204         priv_set->count++;
 205         priv_set->set = new_set;
 206
 207         ret = NT_STATUS_OK;
 208
 209 done:
 210         return ret;
 211 }
 212
 213 NTSTATUS add_privilege_by_name(PRIVILEGE_SET *priv_set, const char *name)
 214 {
 215         int e;
 216
 217         for (e = 0; privs[e].se_priv != SE_ALL_PRIVS; e++) {
 218                 if (StrCaseCmp(privs[e].priv, name) == 0) {
 219                         LUID_ATTR la;
 220
 221                         la.attr = 0;
 222                         la.luid.high = 0;
 223                         la.luid.low = privs[e].se_priv;
 224
 225                         return add_privilege(priv_set, la);
 226                 }
 227         }
 228
 229         DEBUG(1, ("add_privilege_by_name: No Such Privilege Found (%s)\n", name));
 230
 231         return NT_STATUS_UNSUCCESSFUL;
 232 }
 233
 234 /****************************************************************************
 235  add all the privileges to a privilege array
 236  ****************************************************************************/
 237 NTSTATUS add_all_privilege(PRIVILEGE_SET *priv_set)
 238 {
 239         NTSTATUS result = NT_STATUS_OK;
 240         LUID_ATTR set;
 241
 242         set.attr = 0;
 243         set.luid.high = 0;
 244
 245         /* TODO: set a proper list of privileges */
 246         set.luid.low = SE_ADD_USERS;
 247         result = add_privilege(priv_set, set);
 248         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 249
 250         set.luid.low = SE_MACHINE_ACCOUNT;
 251         result = add_privilege(priv_set, set);
 252         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 253
 254         set.luid.low = SE_PRINT_OPERATOR;
 255         result = add_privilege(priv_set, set);
 256         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 257
 258         return result;
 259 }
 260
 261 /****************************************************************************
 262  check if the privilege list is empty
 263  ****************************************************************************/
 264 NTSTATUS check_empty_privilege(PRIVILEGE_SET *priv_set)
 265 {
 266         if (!priv_set)
 267                 return NT_STATUS_INVALID_PARAMETER;
 268
 269         if (priv_set->count == 0)
 270                 return NT_STATUS_OK;
 271
 272         return NT_STATUS_UNSUCCESSFUL;
 273 }
 274
 275 /****************************************************************************
 276  check if the privilege is in the privilege list
 277  ****************************************************************************/
 278 NTSTATUS check_priv_in_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 279 {
 280         int i;
 281
 282         if (!priv_set)
 283                 return NT_STATUS_INVALID_PARAMETER;
 284
 285         /* if the list is empty, obviously we can't have it */
 286         if (NT_STATUS_IS_OK(check_empty_privilege(priv_set)))
 287                 return NT_STATUS_UNSUCCESSFUL;
 288
 289         for (i = 0; i < priv_set->count; i++) {
 290                 LUID_ATTR *cur_set;
 291
 292                 cur_set = &priv_set->set[i];
 293                 /* check only the low and high part. Checking the attr field has no meaning */
 294                 if (    (cur_set->luid.low == set.luid.low) &&
 295                         (cur_set->luid.high == set.luid.high)   ) {
 296                         return NT_STATUS_OK;
 297                 }
 298         }
 299
 300         return NT_STATUS_UNSUCCESSFUL;
 301 }
 302
 303 /****************************************************************************
 304  remove a privilege from a privilege array
 305  ****************************************************************************/
 306 NTSTATUS remove_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 307 {
 308         NTSTATUS ret;
 309         LUID_ATTR *new_set;
 310         LUID_ATTR *old_set;
 311         int i,j;
 312
 313         if (!priv_set)
 314                 return NT_STATUS_INVALID_PARAMETER;
 315
 316         /* check if the privilege is in the list */
 317         if (!NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 318                 return NT_STATUS_UNSUCCESSFUL;
 319
 320         /* special case if it's the only privilege in the list */
 321         if (priv_set->count == 1) {
 322                 reset_privilege(priv_set);
 323                 return NT_STATUS_OK;
 324         }
 325
 326         /*
 327          * the privilege is there, create a new list,
 328          * and copy the other privileges
 329          */
 330
 331         old_set = priv_set->set;
 332
 333         new_set = (LUID_ATTR *)talloc(priv_set->mem_ctx, (priv_set->count - 1) * (sizeof(LUID_ATTR)));
 334         ALLOC_CHECK(new_set, ret, done, "remove_privilege");
 335
 336         for (i=0, j=0; i < priv_set->count; i++) {
 337                 if (    (old_set[i].luid.low == set.luid.low) &&
 338                         (old_set[i].luid.high == set.luid.high) ) {
 339                         continue;
 340                 }
 341
 342                 new_set[j].luid.low = old_set[i].luid.low;
 343                 new_set[j].luid.high = old_set[i].luid.high;
 344                 new_set[j].attr = old_set[i].attr;
 345
 346                 j++;
 347         }
 348
 349         if (j != priv_set->count - 1) {
 350                 DEBUG(0,("remove_privilege: mismatch ! difference is not -1\n"));
 351                 DEBUGADD(0,("old count:%d, new count:%d\n", priv_set->count, j));
 352                 return NT_STATUS_INTERNAL_ERROR;
 353         }
 354
 355         /* ok everything is fine */
 356
 357         priv_set->count--;
 358         priv_set->set = new_set;
 359
 360         ret = NT_STATUS_OK;
 361
 362 done:
 363         return ret;
 364 }
 365
 366 /****************************************************************************
 367  duplicates a privilege array
 368  the new privilege set must be passed inited
 369  (use init_privilege or init_priv_with_ctx)
 370  ****************************************************************************/
 371 NTSTATUS dup_priv_set(PRIVILEGE_SET *new_priv_set, PRIVILEGE_SET *priv_set)
 372 {
 373         NTSTATUS ret;
 374         LUID_ATTR *new_set;
 375         LUID_ATTR *old_set;
 376         int i;
 377
 378         if (new_priv_set == NULL || priv_set == NULL)
 379                 return NT_STATUS_INVALID_PARAMETER;
 380
 381         /* special case if there are no privileges in the list */
 382         if (priv_set->count == 0) {
 383                 return NT_STATUS_OK;
 384         }
 385
 386         /*
 387          * create a new list,
 388          * and copy the other privileges
 389          */
 390
 391         old_set = priv_set->set;
 392
 393         new_set = (LUID_ATTR *)talloc(new_priv_set->mem_ctx, (priv_set->count) * (sizeof(LUID_ATTR)));
 394         ALLOC_CHECK(new_set, ret, done, "dup_priv_set");
 395
 396         for (i=0; i < priv_set->count; i++) {
 397
 398                 new_set[i].luid.low = old_set[i].luid.low;
 399                 new_set[i].luid.high = old_set[i].luid.high;
 400                 new_set[i].attr = old_set[i].attr;
 401         }
 402
 403         new_priv_set->count = priv_set->count;
 404         new_priv_set->control = priv_set->control;
 405         new_priv_set->set = new_set;
 406
 407         ret = NT_STATUS_OK;
 408
 409 done:
 410         return ret;
 411 }
 412
 413
 414 NTSTATUS user_has_privilege(struct current_user *user, uint32 privilege)
 415 {
 416         LUID_ATTR set;
 417
 418         set.attr = 0;
 419         set.luid.high = 0;
 420         set.luid.low = privilege;
 421
 422         return check_priv_in_privilege(user->privs, set);
 423 }
 424