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 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, int count)
 106 {
 107         NTSTATUS ret;
 108         int i;
 109
 110         /* don't crash if the source pointer is NULL (since we don't
 111            do priviledges now anyways) */
 112
 113         if ( !old_la )
 114                 return NT_STATUS_OK;
 115
 116         *new_la = (LUID_ATTR *)talloc(mem_ctx, count*sizeof(LUID_ATTR));
 117         ALLOC_CHECK(new_la, ret, done, "dupalloc_luid_attr");
 118
 119         for (i=0; i<count; i++) {
 120                 (*new_la)[i].luid.high = old_la[i].luid.high;
 121                 (*new_la)[i].luid.low = old_la[i].luid.low;
 122                 (*new_la)[i].attr = old_la[i].attr;
 123         }
 124
 125         ret = NT_STATUS_OK;
 126
 127 done:
 128         return ret;
 129 }
 130
 131 /****************************************************************************
 132  initialise a privilege list
 133  ****************************************************************************/
 134 NTSTATUS init_privilege(PRIVILEGE_SET **priv_set)
 135 {
 136         NTSTATUS ret;
 137         TALLOC_CTX *mem_ctx = talloc_init("privilege set");
 138         ALLOC_CHECK(mem_ctx, ret, done, "init_privilege");
 139
 140         *priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
 141         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
 142
 143         (*priv_set)->mem_ctx = mem_ctx;
 144
 145         ret = NT_STATUS_OK;
 146
 147 done:
 148         return ret;
 149 }
 150
 151 NTSTATUS init_priv_with_ctx(TALLOC_CTX *mem_ctx, PRIVILEGE_SET **priv_set)
 152 {
 153         NTSTATUS ret;
 154
 155         *priv_set = talloc_zero(mem_ctx, sizeof(PRIVILEGE_SET));
 156         ALLOC_CHECK(*priv_set, ret, done, "init_privilege");
 157
 158         (*priv_set)->mem_ctx = mem_ctx;
 159         (*priv_set)->ext_ctx = True;
 160
 161         ret = NT_STATUS_OK;
 162
 163 done:
 164         return ret;
 165 }
 166
 167 void reset_privilege(PRIVILEGE_SET *priv_set)
 168 {
 169         priv_set->count = 0;
 170         priv_set->control = 0;
 171         priv_set->set = NULL;
 172 }
 173
 174 void destroy_privilege(PRIVILEGE_SET **priv_set)
 175 {
 176         if (priv_set == NULL || *priv_set == NULL)
 177                 return;
 178
 179         reset_privilege(*priv_set);
 180         if (!((*priv_set)->ext_ctx))
 181                 /* mem_ctx is local, destroy it */
 182                 talloc_destroy((*priv_set)->mem_ctx);
 183         *priv_set = NULL;
 184 }
 185
 186 /****************************************************************************
 187  add a privilege to a privilege array
 188  ****************************************************************************/
 189 NTSTATUS add_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 190 {
 191         NTSTATUS ret;
 192         LUID_ATTR *new_set;
 193
 194         /* check if the privilege is not already in the list */
 195         if (NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 196                 return NT_STATUS_UNSUCCESSFUL;
 197
 198         /* we can allocate memory to add the new privilege */
 199
 200         new_set = (LUID_ATTR *)talloc_realloc(priv_set->mem_ctx, priv_set->set, (priv_set->count + 1) * (sizeof(LUID_ATTR)));
 201         ALLOC_CHECK(new_set, ret, done, "add_privilege");
 202
 203         new_set[priv_set->count].luid.high = set.luid.high;
 204         new_set[priv_set->count].luid.low = set.luid.low;
 205         new_set[priv_set->count].attr = set.attr;
 206
 207         priv_set->count++;
 208         priv_set->set = new_set;
 209
 210         ret = NT_STATUS_OK;
 211
 212 done:
 213         return ret;
 214 }
 215
 216 NTSTATUS add_privilege_by_name(PRIVILEGE_SET *priv_set, const char *name)
 217 {
 218         int e;
 219
 220         for (e = 0; privs[e].se_priv != SE_ALL_PRIVS; e++) {
 221                 if (StrCaseCmp(privs[e].priv, name) == 0) {
 222                         LUID_ATTR la;
 223
 224                         la.attr = 0;
 225                         la.luid.high = 0;
 226                         la.luid.low = privs[e].se_priv;
 227
 228                         return add_privilege(priv_set, la);
 229                 }
 230         }
 231
 232         DEBUG(1, ("add_privilege_by_name: No Such Privilege Found (%s)\n", name));
 233
 234         return NT_STATUS_UNSUCCESSFUL;
 235 }
 236
 237 /****************************************************************************
 238  add all the privileges to a privilege array
 239  ****************************************************************************/
 240 NTSTATUS add_all_privilege(PRIVILEGE_SET *priv_set)
 241 {
 242         NTSTATUS result = NT_STATUS_OK;
 243         LUID_ATTR set;
 244
 245         set.attr = 0;
 246         set.luid.high = 0;
 247
 248         /* TODO: set a proper list of privileges */
 249         set.luid.low = SE_ADD_USERS;
 250         result = add_privilege(priv_set, set);
 251         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 252
 253         set.luid.low = SE_MACHINE_ACCOUNT;
 254         result = add_privilege(priv_set, set);
 255         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 256
 257         set.luid.low = SE_PRINT_OPERATOR;
 258         result = add_privilege(priv_set, set);
 259         NTSTATUS_CHECK(result, done, "add_all_privilege", "add_privilege");
 260
 261         return result;
 262 }
 263
 264 /****************************************************************************
 265  check if the privilege list is empty
 266  ****************************************************************************/
 267 NTSTATUS check_empty_privilege(PRIVILEGE_SET *priv_set)
 268 {
 269         if (!priv_set)
 270                 return NT_STATUS_INVALID_PARAMETER;
 271
 272         if (priv_set->count == 0)
 273                 return NT_STATUS_OK;
 274
 275         return NT_STATUS_UNSUCCESSFUL;
 276 }
 277
 278 /****************************************************************************
 279  check if the privilege is in the privilege list
 280  ****************************************************************************/
 281 NTSTATUS check_priv_in_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 282 {
 283         int i;
 284
 285         if (!priv_set)
 286                 return NT_STATUS_INVALID_PARAMETER;
 287
 288         /* if the list is empty, obviously we can't have it */
 289         if (NT_STATUS_IS_OK(check_empty_privilege(priv_set)))
 290                 return NT_STATUS_UNSUCCESSFUL;
 291
 292         for (i = 0; i < priv_set->count; i++) {
 293                 LUID_ATTR *cur_set;
 294
 295                 cur_set = &priv_set->set[i];
 296                 /* check only the low and high part. Checking the attr field has no meaning */
 297                 if (    (cur_set->luid.low == set.luid.low) &&
 298                         (cur_set->luid.high == set.luid.high)   ) {
 299                         return NT_STATUS_OK;
 300                 }
 301         }
 302
 303         return NT_STATUS_UNSUCCESSFUL;
 304 }
 305
 306 /****************************************************************************
 307  remove a privilege from a privilege array
 308  ****************************************************************************/
 309 NTSTATUS remove_privilege(PRIVILEGE_SET *priv_set, LUID_ATTR set)
 310 {
 311         NTSTATUS ret;
 312         LUID_ATTR *new_set;
 313         LUID_ATTR *old_set;
 314         int i,j;
 315
 316         if (!priv_set)
 317                 return NT_STATUS_INVALID_PARAMETER;
 318
 319         /* check if the privilege is in the list */
 320         if (!NT_STATUS_IS_OK(check_priv_in_privilege(priv_set, set)))
 321                 return NT_STATUS_UNSUCCESSFUL;
 322
 323         /* special case if it's the only privilege in the list */
 324         if (priv_set->count == 1) {
 325                 reset_privilege(priv_set);
 326                 return NT_STATUS_OK;
 327         }
 328
 329         /*
 330          * the privilege is there, create a new list,
 331          * and copy the other privileges
 332          */
 333
 334         old_set = priv_set->set;
 335
 336         new_set = (LUID_ATTR *)talloc(priv_set->mem_ctx, (priv_set->count - 1) * (sizeof(LUID_ATTR)));
 337         ALLOC_CHECK(new_set, ret, done, "remove_privilege");
 338
 339         for (i=0, j=0; i < priv_set->count; i++) {
 340                 if (    (old_set[i].luid.low == set.luid.low) &&
 341                         (old_set[i].luid.high == set.luid.high) ) {
 342                         continue;
 343                 }
 344
 345                 new_set[j].luid.low = old_set[i].luid.low;
 346                 new_set[j].luid.high = old_set[i].luid.high;
 347                 new_set[j].attr = old_set[i].attr;
 348
 349                 j++;
 350         }
 351
 352         if (j != priv_set->count - 1) {
 353                 DEBUG(0,("remove_privilege: mismatch ! difference is not -1\n"));
 354                 DEBUGADD(0,("old count:%d, new count:%d\n", priv_set->count, j));
 355                 return NT_STATUS_INTERNAL_ERROR;
 356         }
 357
 358         /* ok everything is fine */
 359
 360         priv_set->count--;
 361         priv_set->set = new_set;
 362
 363         ret = NT_STATUS_OK;
 364
 365 done:
 366         return ret;
 367 }
 368
 369 /****************************************************************************
 370  duplicates a privilege array
 371  the new privilege set must be passed inited
 372  (use init_privilege or init_priv_with_ctx)
 373  ****************************************************************************/
 374 NTSTATUS dup_priv_set(PRIVILEGE_SET *new_priv_set, PRIVILEGE_SET *priv_set)
 375 {
 376         NTSTATUS ret;
 377         LUID_ATTR *new_set;
 378         LUID_ATTR *old_set;
 379         int i;
 380
 381         if (new_priv_set == NULL || priv_set == NULL)
 382                 return NT_STATUS_INVALID_PARAMETER;
 383
 384         /* special case if there are no privileges in the list */
 385         if (priv_set->count == 0) {
 386                 return NT_STATUS_OK;
 387         }
 388
 389         /*
 390          * create a new list,
 391          * and copy the other privileges
 392          */
 393
 394         old_set = priv_set->set;
 395
 396         new_set = (LUID_ATTR *)talloc(new_priv_set->mem_ctx, (priv_set->count) * (sizeof(LUID_ATTR)));
 397         ALLOC_CHECK(new_set, ret, done, "dup_priv_set");
 398
 399         for (i=0; i < priv_set->count; i++) {
 400
 401                 new_set[i].luid.low = old_set[i].luid.low;
 402                 new_set[i].luid.high = old_set[i].luid.high;
 403                 new_set[i].attr = old_set[i].attr;
 404         }
 405
 406         new_priv_set->count = priv_set->count;
 407         new_priv_set->control = priv_set->control;
 408         new_priv_set->set = new_set;
 409
 410         ret = NT_STATUS_OK;
 411
 412 done:
 413         return ret;
 414 }
 415
 416
 417 NTSTATUS user_has_privilege(struct current_user *user, uint32 privilege)
 418 {
 419         LUID_ATTR set;
 420
 421         set.attr = 0;
 422         set.luid.high = 0;
 423         set.luid.low = privilege;
 424
 425         return check_priv_in_privilege(user->privs, set);
 426 }
 427
 428 BOOL luid_to_privilege_name(const LUID *set, fstring name)
 429 {
 430         int i;
 431
 432         if (set->high != 0)
 433                 return False;
 434
 435         for (i=1; i<PRIV_ALL_INDEX-1; i++) {
 436                 if (set->low == privs[i].se_priv) {
 437                         fstrcpy(name, privs[i].priv);
 438                         return True;
 439                 }
 440         }
 441         return False;
 442 }