reactos/ntoskrnl/se/semgr.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            ntoskrnl/se/semgr.c
   5  * PURPOSE:         Security manager
   6  *
   7  * PROGRAMMERS:     No programmer listed.
   8  */
   9
  10 /* INCLUDES *******************************************************************/
  11
  12 #include <ntoskrnl.h>
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* GLOBALS ********************************************************************/
  17
  18 PSE_EXPORTS SeExports = NULL;
  19 SE_EXPORTS SepExports;
  20
  21 extern ULONG ExpInitializationPhase;
  22 extern ERESOURCE SepSubjectContextLock;
  23
  24 /* PRIVATE FUNCTIONS **********************************************************/
  25
  26 static BOOLEAN INIT_FUNCTION
  27 SepInitExports(VOID)
  28 {
  29     SepExports.SeCreateTokenPrivilege = SeCreateTokenPrivilege;
  30     SepExports.SeAssignPrimaryTokenPrivilege = SeAssignPrimaryTokenPrivilege;
  31     SepExports.SeLockMemoryPrivilege = SeLockMemoryPrivilege;
  32     SepExports.SeIncreaseQuotaPrivilege = SeIncreaseQuotaPrivilege;
  33     SepExports.SeUnsolicitedInputPrivilege = SeUnsolicitedInputPrivilege;
  34     SepExports.SeTcbPrivilege = SeTcbPrivilege;
  35     SepExports.SeSecurityPrivilege = SeSecurityPrivilege;
  36     SepExports.SeTakeOwnershipPrivilege = SeTakeOwnershipPrivilege;
  37     SepExports.SeLoadDriverPrivilege = SeLoadDriverPrivilege;
  38     SepExports.SeCreatePagefilePrivilege = SeCreatePagefilePrivilege;
  39     SepExports.SeIncreaseBasePriorityPrivilege = SeIncreaseBasePriorityPrivilege;
  40     SepExports.SeSystemProfilePrivilege = SeSystemProfilePrivilege;
  41     SepExports.SeSystemtimePrivilege = SeSystemtimePrivilege;
  42     SepExports.SeProfileSingleProcessPrivilege = SeProfileSingleProcessPrivilege;
  43     SepExports.SeCreatePermanentPrivilege = SeCreatePermanentPrivilege;
  44     SepExports.SeBackupPrivilege = SeBackupPrivilege;
  45     SepExports.SeRestorePrivilege = SeRestorePrivilege;
  46     SepExports.SeShutdownPrivilege = SeShutdownPrivilege;
  47     SepExports.SeDebugPrivilege = SeDebugPrivilege;
  48     SepExports.SeAuditPrivilege = SeAuditPrivilege;
  49     SepExports.SeSystemEnvironmentPrivilege = SeSystemEnvironmentPrivilege;
  50     SepExports.SeChangeNotifyPrivilege = SeChangeNotifyPrivilege;
  51     SepExports.SeRemoteShutdownPrivilege = SeRemoteShutdownPrivilege;
  52
  53     SepExports.SeNullSid = SeNullSid;
  54     SepExports.SeWorldSid = SeWorldSid;
  55     SepExports.SeLocalSid = SeLocalSid;
  56     SepExports.SeCreatorOwnerSid = SeCreatorOwnerSid;
  57     SepExports.SeCreatorGroupSid = SeCreatorGroupSid;
  58     SepExports.SeNtAuthoritySid = SeNtAuthoritySid;
  59     SepExports.SeDialupSid = SeDialupSid;
  60     SepExports.SeNetworkSid = SeNetworkSid;
  61     SepExports.SeBatchSid = SeBatchSid;
  62     SepExports.SeInteractiveSid = SeInteractiveSid;
  63     SepExports.SeLocalSystemSid = SeLocalSystemSid;
  64     SepExports.SeAliasAdminsSid = SeAliasAdminsSid;
  65     SepExports.SeAliasUsersSid = SeAliasUsersSid;
  66     SepExports.SeAliasGuestsSid = SeAliasGuestsSid;
  67     SepExports.SeAliasPowerUsersSid = SeAliasPowerUsersSid;
  68     SepExports.SeAliasAccountOpsSid = SeAliasAccountOpsSid;
  69     SepExports.SeAliasSystemOpsSid = SeAliasSystemOpsSid;
  70     SepExports.SeAliasPrintOpsSid = SeAliasPrintOpsSid;
  71     SepExports.SeAliasBackupOpsSid = SeAliasBackupOpsSid;
  72     SepExports.SeAuthenticatedUsersSid = SeAuthenticatedUsersSid;
  73     SepExports.SeRestrictedSid = SeRestrictedSid;
  74     SepExports.SeAnonymousLogonSid = SeAnonymousLogonSid;
  75
  76     SepExports.SeUndockPrivilege = SeUndockPrivilege;
  77     SepExports.SeSyncAgentPrivilege = SeSyncAgentPrivilege;
  78     SepExports.SeEnableDelegationPrivilege = SeEnableDelegationPrivilege;
  79
  80     SeExports = &SepExports;
  81     return TRUE;
  82 }
  83
  84
  85 BOOLEAN
  86 NTAPI
  87 SepInitializationPhase0(VOID)
  88 {
  89     PAGED_CODE();
  90
  91     ExpInitLuid();
  92     if (!SepInitSecurityIDs()) return FALSE;
  93     if (!SepInitDACLs()) return FALSE;
  94     if (!SepInitSDs()) return FALSE;
  95     SepInitPrivileges();
  96     if (!SepInitExports()) return FALSE;
  97
  98     /* Initialize the subject context lock */
  99     ExInitializeResource(&SepSubjectContextLock);
 100
 101     /* Initialize token objects */
 102     SepInitializeTokenImplementation();
 103
 104     /* Clear impersonation info for the idle thread */
 105     PsGetCurrentThread()->ImpersonationInfo = NULL;
 106     PspClearCrossThreadFlag(PsGetCurrentThread(),
 107                             CT_ACTIVE_IMPERSONATION_INFO_BIT);
 108
 109     /* Initialize the boot token */
 110     ObInitializeFastReference(&PsGetCurrentProcess()->Token, NULL);
 111     ObInitializeFastReference(&PsGetCurrentProcess()->Token,
 112                               SepCreateSystemProcessToken());
 113     return TRUE;
 114 }
 115
 116 BOOLEAN
 117 NTAPI
 118 SepInitializationPhase1(VOID)
 119 {
 120     NTSTATUS Status;
 121     PAGED_CODE();
 122
 123     /* Insert the system token into the tree */
 124     Status = ObInsertObject((PVOID)(PsGetCurrentProcess()->Token.Value &
 125                                     ~MAX_FAST_REFS),
 126                             NULL,
 127                             0,
 128                             0,
 129                             NULL,
 130                             NULL);
 131     ASSERT(NT_SUCCESS(Status));
 132
 133     /* FIXME: TODO \\ Security directory */
 134     return TRUE;
 135 }
 136
 137 BOOLEAN
 138 NTAPI
 139 SeInitSystem(VOID)
 140 {
 141     /* Check the initialization phase */
 142     switch (ExpInitializationPhase)
 143     {
 144         case 0:
 145
 146             /* Do Phase 0 */
 147             return SepInitializationPhase0();
 148
 149         case 1:
 150
 151             /* Do Phase 1 */
 152             return SepInitializationPhase1();
 153
 154         default:
 155
 156             /* Don't know any other phase! Bugcheck! */
 157             KeBugCheckEx(UNEXPECTED_INITIALIZATION_CALL,
 158                          0,
 159                          ExpInitializationPhase,
 160                          0,
 161                          0);
 162             return FALSE;
 163     }
 164 }
 165
 166 BOOLEAN
 167 NTAPI
 168 SeInitSRM(VOID)
 169 {
 170     OBJECT_ATTRIBUTES ObjectAttributes;
 171     UNICODE_STRING Name;
 172     HANDLE DirectoryHandle;
 173     HANDLE EventHandle;
 174     NTSTATUS Status;
 175
 176     /* Create '\Security' directory */
 177     RtlInitUnicodeString(&Name,
 178                          L"\\Security");
 179     InitializeObjectAttributes(&ObjectAttributes,
 180                                &Name,
 181                                OBJ_PERMANENT,
 182                                0,
 183                                NULL);
 184     Status = ZwCreateDirectoryObject(&DirectoryHandle,
 185                                      DIRECTORY_ALL_ACCESS,
 186                                      &ObjectAttributes);
 187     if (!NT_SUCCESS(Status))
 188     {
 189         DPRINT1("Failed to create 'Security' directory!\n");
 190         return FALSE;
 191     }
 192
 193     /* Create 'LSA_AUTHENTICATION_INITALIZED' event */
 194     RtlInitUnicodeString(&Name,
 195                          L"\\LSA_AUTHENTICATION_INITALIZED");
 196     InitializeObjectAttributes(&ObjectAttributes,
 197                                &Name,
 198                                OBJ_PERMANENT,
 199                                DirectoryHandle,
 200                                SePublicDefaultSd);
 201     Status = ZwCreateEvent(&EventHandle,
 202                            EVENT_ALL_ACCESS,
 203                            &ObjectAttributes,
 204                            SynchronizationEvent,
 205                            FALSE);
 206     if (!NT_SUCCESS(Status))
 207     {
 208         DPRINT1("Failed to create 'LSA_AUTHENTICATION_INITALIZED' event!\n");
 209         NtClose(DirectoryHandle);
 210         return FALSE;
 211     }
 212
 213     ZwClose(EventHandle);
 214     ZwClose(DirectoryHandle);
 215
 216     /* FIXME: Create SRM port and listener thread */
 217
 218     return TRUE;
 219 }
 220
 221 NTSTATUS
 222 NTAPI
 223 SeDefaultObjectMethod(IN PVOID Object,
 224                       IN SECURITY_OPERATION_CODE OperationType,
 225                       IN PSECURITY_INFORMATION SecurityInformation,
 226                       IN OUT PSECURITY_DESCRIPTOR SecurityDescriptor,
 227                       IN OUT PULONG ReturnLength OPTIONAL,
 228                       IN OUT PSECURITY_DESCRIPTOR *OldSecurityDescriptor,
 229                       IN POOL_TYPE PoolType,
 230                       IN PGENERIC_MAPPING GenericMapping)
 231 {
 232     PAGED_CODE();
 233
 234     /* Select the operation type */
 235     switch (OperationType)
 236     {
 237             /* Setting a new descriptor */
 238         case SetSecurityDescriptor:
 239
 240             /* Sanity check */
 241             ASSERT((PoolType == PagedPool) || (PoolType == NonPagedPool));
 242
 243             /* Set the information */
 244             return ObSetSecurityDescriptorInfo(Object,
 245                                                SecurityInformation,
 246                                                SecurityDescriptor,
 247                                                OldSecurityDescriptor,
 248                                                PoolType,
 249                                                GenericMapping);
 250
 251         case QuerySecurityDescriptor:
 252
 253             /* Query the information */
 254             return ObQuerySecurityDescriptorInfo(Object,
 255                                                  SecurityInformation,
 256                                                  SecurityDescriptor,
 257                                                  ReturnLength,
 258                                                  OldSecurityDescriptor);
 259
 260         case DeleteSecurityDescriptor:
 261
 262             /* De-assign it */
 263             return ObDeassignSecurity(OldSecurityDescriptor);
 264
 265         case AssignSecurityDescriptor:
 266
 267             /* Assign it */
 268             ObAssignObjectSecurityDescriptor(Object, SecurityDescriptor, PoolType);
 269             return STATUS_SUCCESS;
 270
 271         default:
 272
 273             /* Bug check */
 274             KeBugCheckEx(SECURITY_SYSTEM, 0, STATUS_INVALID_PARAMETER, 0, 0);
 275     }
 276
 277     /* Should never reach here */
 278     ASSERT(FALSE);
 279     return STATUS_SUCCESS;
 280 }
 281
 282 ULONG SidInTokenCalls = 0;
 283
 284 static BOOLEAN
 285 SepSidInToken(PACCESS_TOKEN _Token,
 286               PSID Sid)
 287 {
 288     ULONG i;
 289     PTOKEN Token = (PTOKEN)_Token;
 290
 291     PAGED_CODE();
 292
 293     SidInTokenCalls++;
 294     if (!(SidInTokenCalls % 10000)) DPRINT1("SidInToken Calls: %d\n", SidInTokenCalls);
 295
 296     if (Token->UserAndGroupCount == 0)
 297     {
 298         return FALSE;
 299     }
 300
 301     for (i=0; i<Token->UserAndGroupCount; i++)
 302     {
 303         if (RtlEqualSid(Sid, Token->UserAndGroups[i].Sid))
 304         {
 305             if ((i == 0)|| (Token->UserAndGroups[i].Attributes & SE_GROUP_ENABLED))
 306             {
 307                 return TRUE;
 308             }
 309
 310             return FALSE;
 311         }
 312     }
 313
 314     return FALSE;
 315 }
 316
 317
 318 VOID NTAPI
 319 SeQuerySecurityAccessMask(IN SECURITY_INFORMATION SecurityInformation,
 320                           OUT PACCESS_MASK DesiredAccess)
 321 {
 322     *DesiredAccess = 0;
 323
 324     if (SecurityInformation & (OWNER_SECURITY_INFORMATION |
 325                                GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION))
 326     {
 327         *DesiredAccess |= READ_CONTROL;
 328     }
 329     if (SecurityInformation & SACL_SECURITY_INFORMATION)
 330     {
 331         *DesiredAccess |= ACCESS_SYSTEM_SECURITY;
 332     }
 333 }
 334
 335 VOID NTAPI
 336 SeSetSecurityAccessMask(IN SECURITY_INFORMATION SecurityInformation,
 337                         OUT PACCESS_MASK DesiredAccess)
 338 {
 339     *DesiredAccess = 0;
 340
 341     if (SecurityInformation & (OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION))
 342     {
 343         *DesiredAccess |= WRITE_OWNER;
 344     }
 345     if (SecurityInformation & DACL_SECURITY_INFORMATION)
 346     {
 347         *DesiredAccess |= WRITE_DAC;
 348     }
 349     if (SecurityInformation & SACL_SECURITY_INFORMATION)
 350     {
 351         *DesiredAccess |= ACCESS_SYSTEM_SECURITY;
 352     }
 353 }
 354
 355 BOOLEAN NTAPI
 356 SepAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 357                IN PSECURITY_SUBJECT_CONTEXT SubjectSecurityContext,
 358                IN BOOLEAN SubjectContextLocked,
 359                IN ACCESS_MASK DesiredAccess,
 360                IN ACCESS_MASK PreviouslyGrantedAccess,
 361                OUT PPRIVILEGE_SET* Privileges,
 362                IN PGENERIC_MAPPING GenericMapping,
 363                IN KPROCESSOR_MODE AccessMode,
 364                OUT PACCESS_MASK GrantedAccess,
 365                OUT PNTSTATUS AccessStatus,
 366                SECURITY_IMPERSONATION_LEVEL LowestImpersonationLevel)
 367 {
 368     LUID_AND_ATTRIBUTES Privilege;
 369     ACCESS_MASK CurrentAccess, AccessMask;
 370     PACCESS_TOKEN Token;
 371     ULONG i;
 372     PACL Dacl;
 373     BOOLEAN Present;
 374     BOOLEAN Defaulted;
 375     PACE CurrentAce;
 376     PSID Sid;
 377     NTSTATUS Status;
 378     PAGED_CODE();
 379
 380     /* Check if we didn't get an SD */
 381     if (!SecurityDescriptor)
 382     {
 383         /* Automatic failure */
 384         *AccessStatus = STATUS_ACCESS_DENIED;
 385         return FALSE;
 386     }
 387
 388     /* Check for invalid impersonation */
 389     if ((SubjectSecurityContext->ClientToken) &&
 390         (SubjectSecurityContext->ImpersonationLevel < LowestImpersonationLevel))
 391     {
 392         *AccessStatus = STATUS_BAD_IMPERSONATION_LEVEL;
 393         return FALSE;
 394     }
 395
 396     /* Check for no access desired */
 397     if (!DesiredAccess)
 398     {
 399         /* Check if we had no previous access */
 400         if (!PreviouslyGrantedAccess)
 401         {
 402             /* Then there's nothing to give */
 403             *AccessStatus = STATUS_ACCESS_DENIED;
 404             return FALSE;
 405         }
 406
 407         /* Return the previous access only */
 408         *GrantedAccess = PreviouslyGrantedAccess;
 409         *AccessStatus = STATUS_SUCCESS;
 410         *Privileges = NULL;
 411         return TRUE;
 412     }
 413
 414     /* Acquire the lock if needed */
 415     if (!SubjectContextLocked) SeLockSubjectContext(SubjectSecurityContext);
 416
 417     /* Map given accesses */
 418     RtlMapGenericMask(&DesiredAccess, GenericMapping);
 419     if (PreviouslyGrantedAccess)
 420         RtlMapGenericMask(&PreviouslyGrantedAccess, GenericMapping);
 421
 422
 423
 424     CurrentAccess = PreviouslyGrantedAccess;
 425
 426
 427
 428     Token = SubjectSecurityContext->ClientToken ?
 429     SubjectSecurityContext->ClientToken : SubjectSecurityContext->PrimaryToken;
 430
 431     /* Get the DACL */
 432     Status = RtlGetDaclSecurityDescriptor(SecurityDescriptor,
 433                                           &Present,
 434                                           &Dacl,
 435                                           &Defaulted);
 436     if (!NT_SUCCESS(Status))
 437     {
 438         if (SubjectContextLocked == FALSE)
 439         {
 440             SeUnlockSubjectContext(SubjectSecurityContext);
 441         }
 442
 443         *AccessStatus = Status;
 444         return FALSE;
 445     }
 446
 447     /* RULE 1: Grant desired access if the object is unprotected */
 448     if (Present == FALSE || Dacl == NULL)
 449     {
 450         if (SubjectContextLocked == FALSE)
 451         {
 452             SeUnlockSubjectContext(SubjectSecurityContext);
 453         }
 454
 455         if (DesiredAccess & MAXIMUM_ALLOWED)
 456         {
 457             *GrantedAccess = GenericMapping->GenericAll;
 458             *GrantedAccess |= (DesiredAccess & ~MAXIMUM_ALLOWED);
 459         }
 460         else
 461         {
 462             *GrantedAccess = DesiredAccess | PreviouslyGrantedAccess;
 463         }
 464
 465         *AccessStatus = STATUS_SUCCESS;
 466         return TRUE;
 467     }
 468
 469     CurrentAccess = PreviouslyGrantedAccess;
 470
 471     /* RULE 2: Check token for 'take ownership' privilege */
 472     Privilege.Luid = SeTakeOwnershipPrivilege;
 473     Privilege.Attributes = SE_PRIVILEGE_ENABLED;
 474
 475     if (SepPrivilegeCheck(Token,
 476                           &Privilege,
 477                           1,
 478                           PRIVILEGE_SET_ALL_NECESSARY,
 479                           AccessMode))
 480     {
 481         CurrentAccess |= WRITE_OWNER;
 482         if ((DesiredAccess & ~VALID_INHERIT_FLAGS) ==
 483             (CurrentAccess & ~VALID_INHERIT_FLAGS))
 484         {
 485             if (SubjectContextLocked == FALSE)
 486             {
 487                 SeUnlockSubjectContext(SubjectSecurityContext);
 488             }
 489
 490             *GrantedAccess = CurrentAccess;
 491             *AccessStatus = STATUS_SUCCESS;
 492             return TRUE;
 493         }
 494     }
 495
 496     /* RULE 3: Check whether the token is the owner */
 497     Status = RtlGetOwnerSecurityDescriptor(SecurityDescriptor,
 498                                            &Sid,
 499                                            &Defaulted);
 500     if (!NT_SUCCESS(Status))
 501     {
 502         DPRINT1("RtlGetOwnerSecurityDescriptor() failed (Status %lx)\n", Status);
 503         if (SubjectContextLocked == FALSE)
 504         {
 505             SeUnlockSubjectContext(SubjectSecurityContext);
 506         }
 507
 508         *AccessStatus = Status;
 509         return FALSE;
 510     }
 511
 512     if (Sid && SepSidInToken(Token, Sid))
 513     {
 514         CurrentAccess |= (READ_CONTROL | WRITE_DAC);
 515         if ((DesiredAccess & ~VALID_INHERIT_FLAGS) ==
 516             (CurrentAccess & ~VALID_INHERIT_FLAGS))
 517         {
 518             if (SubjectContextLocked == FALSE)
 519             {
 520                 SeUnlockSubjectContext(SubjectSecurityContext);
 521             }
 522
 523             *GrantedAccess = CurrentAccess;
 524             *AccessStatus = STATUS_SUCCESS;
 525             return TRUE;
 526         }
 527     }
 528
 529     /* Fail if DACL is absent */
 530     if (Present == FALSE)
 531     {
 532         if (SubjectContextLocked == FALSE)
 533         {
 534             SeUnlockSubjectContext(SubjectSecurityContext);
 535         }
 536
 537         *GrantedAccess = 0;
 538         *AccessStatus = STATUS_ACCESS_DENIED;
 539         return FALSE;
 540     }
 541
 542     /* RULE 4: Grant rights according to the DACL */
 543     CurrentAce = (PACE)(Dacl + 1);
 544     for (i = 0; i < Dacl->AceCount; i++)
 545     {
 546         Sid = (PSID)(CurrentAce + 1);
 547         if (CurrentAce->Header.AceType == ACCESS_DENIED_ACE_TYPE)
 548         {
 549             if (SepSidInToken(Token, Sid))
 550             {
 551                 if (SubjectContextLocked == FALSE)
 552                 {
 553                     SeUnlockSubjectContext(SubjectSecurityContext);
 554                 }
 555
 556                 *GrantedAccess = 0;
 557                 *AccessStatus = STATUS_ACCESS_DENIED;
 558                 return FALSE;
 559             }
 560         }
 561
 562         else if (CurrentAce->Header.AceType == ACCESS_ALLOWED_ACE_TYPE)
 563         {
 564             if (SepSidInToken(Token, Sid))
 565             {
 566                 AccessMask = CurrentAce->AccessMask;
 567                 RtlMapGenericMask(&AccessMask, GenericMapping);
 568                 CurrentAccess |= AccessMask;
 569             }
 570         }
 571         else
 572         {
 573             DPRINT1("Unknown Ace type 0x%lx\n", CurrentAce->Header.AceType);
 574         }
 575         CurrentAce = (PACE)((ULONG_PTR)CurrentAce + CurrentAce->Header.AceSize);
 576     }
 577
 578     if (SubjectContextLocked == FALSE)
 579     {
 580         SeUnlockSubjectContext(SubjectSecurityContext);
 581     }
 582
 583     DPRINT("CurrentAccess %08lx\n DesiredAccess %08lx\n",
 584            CurrentAccess, DesiredAccess);
 585
 586     *GrantedAccess = CurrentAccess & DesiredAccess;
 587
 588     if (DesiredAccess & MAXIMUM_ALLOWED)
 589     {
 590         *GrantedAccess = CurrentAccess;
 591         *AccessStatus = STATUS_SUCCESS;
 592         return TRUE;
 593     }
 594     else if ((*GrantedAccess & ~VALID_INHERIT_FLAGS) ==
 595              (DesiredAccess & ~VALID_INHERIT_FLAGS))
 596     {
 597         *AccessStatus = STATUS_SUCCESS;
 598         return TRUE;
 599     }
 600     else
 601     {
 602         DPRINT1("HACK: Should deny access for caller: granted 0x%lx, desired 0x%lx (generic mapping %p).\n",
 603                 *GrantedAccess, DesiredAccess, GenericMapping);
 604         //*AccessStatus = STATUS_ACCESS_DENIED;
 605         //return FALSE;
 606         *AccessStatus = STATUS_SUCCESS;
 607         return TRUE;
 608     }
 609 }
 610
 611 static PSID
 612 SepGetSDOwner(IN PSECURITY_DESCRIPTOR _SecurityDescriptor)
 613 {
 614     PISECURITY_DESCRIPTOR SecurityDescriptor = _SecurityDescriptor;
 615     PSID Owner;
 616
 617     if (SecurityDescriptor->Control & SE_SELF_RELATIVE)
 618         Owner = (PSID)((ULONG_PTR)SecurityDescriptor->Owner +
 619                        (ULONG_PTR)SecurityDescriptor);
 620     else
 621         Owner = (PSID)SecurityDescriptor->Owner;
 622
 623     return Owner;
 624 }
 625
 626 static PSID
 627 SepGetSDGroup(IN PSECURITY_DESCRIPTOR _SecurityDescriptor)
 628 {
 629     PISECURITY_DESCRIPTOR SecurityDescriptor = _SecurityDescriptor;
 630     PSID Group;
 631
 632     if (SecurityDescriptor->Control & SE_SELF_RELATIVE)
 633         Group = (PSID)((ULONG_PTR)SecurityDescriptor->Group +
 634                        (ULONG_PTR)SecurityDescriptor);
 635     else
 636         Group = (PSID)SecurityDescriptor->Group;
 637
 638     return Group;
 639 }
 640
 641
 642 /* PUBLIC FUNCTIONS ***********************************************************/
 643
 644 /*
 645  * @implemented
 646  */
 647 BOOLEAN NTAPI
 648 SeAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 649               IN PSECURITY_SUBJECT_CONTEXT SubjectSecurityContext,
 650               IN BOOLEAN SubjectContextLocked,
 651               IN ACCESS_MASK DesiredAccess,
 652               IN ACCESS_MASK PreviouslyGrantedAccess,
 653               OUT PPRIVILEGE_SET* Privileges,
 654               IN PGENERIC_MAPPING GenericMapping,
 655               IN KPROCESSOR_MODE AccessMode,
 656               OUT PACCESS_MASK GrantedAccess,
 657               OUT PNTSTATUS AccessStatus)
 658 {
 659     PAGED_CODE();
 660
 661     /* Check if this is kernel mode */
 662     if (AccessMode == KernelMode)
 663     {
 664         /* Check if kernel wants everything */
 665         if (DesiredAccess & MAXIMUM_ALLOWED)
 666         {
 667             /* Give it */
 668             *GrantedAccess = GenericMapping->GenericAll;
 669             *GrantedAccess |= (DesiredAccess &~ MAXIMUM_ALLOWED);
 670             *GrantedAccess |= PreviouslyGrantedAccess;
 671         }
 672         else
 673         {
 674             /* Give the desired and previous access */
 675             *GrantedAccess = DesiredAccess | PreviouslyGrantedAccess;
 676         }
 677
 678         /* Success */
 679         *AccessStatus = STATUS_SUCCESS;
 680         return TRUE;
 681     }
 682
 683     /* Call the internal function */
 684     return SepAccessCheck(SecurityDescriptor,
 685                           SubjectSecurityContext,
 686                           SubjectContextLocked,
 687                           DesiredAccess,
 688                           PreviouslyGrantedAccess,
 689                           Privileges,
 690                           GenericMapping,
 691                           AccessMode,
 692                           GrantedAccess,
 693                           AccessStatus,
 694                           SecurityImpersonation);
 695 }
 696
 697 /* SYSTEM CALLS ***************************************************************/
 698
 699 /*
 700  * @implemented
 701  */
 702 NTSTATUS
 703 NTAPI
 704 NtAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 705               IN HANDLE TokenHandle,
 706               IN ACCESS_MASK DesiredAccess,
 707               IN PGENERIC_MAPPING GenericMapping,
 708               OUT PPRIVILEGE_SET PrivilegeSet OPTIONAL,
 709               IN OUT PULONG PrivilegeSetLength,
 710               OUT PACCESS_MASK GrantedAccess,
 711               OUT PNTSTATUS AccessStatus)
 712 {
 713     SECURITY_SUBJECT_CONTEXT SubjectSecurityContext;
 714     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
 715     PTOKEN Token;
 716     NTSTATUS Status;
 717     PAGED_CODE();
 718
 719     /* Check if this is kernel mode */
 720     if (PreviousMode == KernelMode)
 721     {
 722         /* Check if kernel wants everything */
 723         if (DesiredAccess & MAXIMUM_ALLOWED)
 724         {
 725             /* Give it */
 726             *GrantedAccess = GenericMapping->GenericAll;
 727             *GrantedAccess |= (DesiredAccess &~ MAXIMUM_ALLOWED);
 728         }
 729         else
 730         {
 731             /* Just give the desired access */
 732             *GrantedAccess = DesiredAccess;
 733         }
 734
 735         /* Success */
 736         *AccessStatus = STATUS_SUCCESS;
 737         return STATUS_SUCCESS;
 738     }
 739
 740     /* Protect probe in SEH */
 741     _SEH2_TRY
 742     {
 743         /* Probe all pointers */
 744         ProbeForRead(GenericMapping, sizeof(GENERIC_MAPPING), sizeof(ULONG));
 745         ProbeForRead(PrivilegeSetLength, sizeof(ULONG), sizeof(ULONG));
 746         ProbeForWrite(PrivilegeSet, *PrivilegeSetLength, sizeof(ULONG));
 747         ProbeForWrite(GrantedAccess, sizeof(ACCESS_MASK), sizeof(ULONG));
 748         ProbeForWrite(AccessStatus, sizeof(NTSTATUS), sizeof(ULONG));
 749     }
 750     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 751     {
 752         /* Return the exception code */
 753         _SEH2_YIELD(return _SEH2_GetExceptionCode());
 754     }
 755     _SEH2_END;
 756
 757     /* Check for unmapped access rights */
 758     if (DesiredAccess & (GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL))
 759         return STATUS_GENERIC_NOT_MAPPED;
 760
 761     /* Reference the token */
 762     Status = ObReferenceObjectByHandle(TokenHandle,
 763                                        TOKEN_QUERY,
 764                                        SepTokenObjectType,
 765                                        PreviousMode,
 766                                        (PVOID*)&Token,
 767                                        NULL);
 768     if (!NT_SUCCESS(Status))
 769     {
 770         DPRINT("Failed to reference token (Status %lx)\n", Status);
 771         return Status;
 772     }
 773
 774     /* Check token type */
 775     if (Token->TokenType != TokenImpersonation)
 776     {
 777         DPRINT("No impersonation token\n");
 778         ObDereferenceObject(Token);
 779         return STATUS_NO_IMPERSONATION_TOKEN;
 780     }
 781
 782     /* Check the impersonation level */
 783     if (Token->ImpersonationLevel < SecurityIdentification)
 784     {
 785         DPRINT("Impersonation level < SecurityIdentification\n");
 786         ObDereferenceObject(Token);
 787         return STATUS_BAD_IMPERSONATION_LEVEL;
 788     }
 789
 790     /* Check security descriptor for valid owner and group */
 791     if (SepGetSDOwner(SecurityDescriptor)== NULL ||
 792         SepGetSDGroup(SecurityDescriptor) == NULL)
 793     {
 794         DPRINT("Security Descriptor does not have a valid group or owner\n");
 795         ObDereferenceObject(Token);
 796         return STATUS_INVALID_SECURITY_DESCR;
 797     }
 798
 799     /* Set up the subject context, and lock it */
 800     SubjectSecurityContext.ClientToken = Token;
 801     SubjectSecurityContext.ImpersonationLevel = Token->ImpersonationLevel;
 802     SubjectSecurityContext.PrimaryToken = NULL;
 803     SubjectSecurityContext.ProcessAuditId = NULL;
 804     SeLockSubjectContext(&SubjectSecurityContext);
 805
 806     /* Now perform the access check */
 807     SepAccessCheck(SecurityDescriptor,
 808                    &SubjectSecurityContext,
 809                    TRUE,
 810                    DesiredAccess,
 811                    0,
 812                    &PrivilegeSet, //FIXME
 813                    GenericMapping,
 814                    PreviousMode,
 815                    GrantedAccess,
 816                    AccessStatus,
 817                    SecurityIdentification);
 818
 819     /* Unlock subject context */
 820     SeUnlockSubjectContext(&SubjectSecurityContext);
 821
 822     /* Dereference the token */
 823     ObDereferenceObject(Token);
 824
 825     /* Check succeeded */
 826     return STATUS_SUCCESS;
 827 }
 828
 829
 830 NTSTATUS
 831 NTAPI
 832 NtAccessCheckByType(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 833                     IN PSID PrincipalSelfSid,
 834                     IN HANDLE ClientToken,
 835                     IN ACCESS_MASK DesiredAccess,
 836                     IN POBJECT_TYPE_LIST ObjectTypeList,
 837                     IN ULONG ObjectTypeLength,
 838                     IN PGENERIC_MAPPING GenericMapping,
 839                     IN PPRIVILEGE_SET PrivilegeSet,
 840                     IN ULONG PrivilegeSetLength,
 841                     OUT PACCESS_MASK GrantedAccess,
 842                     OUT PNTSTATUS AccessStatus)
 843 {
 844     UNIMPLEMENTED;
 845     return STATUS_NOT_IMPLEMENTED;
 846 }
 847
 848 NTSTATUS
 849 NTAPI
 850 NtAccessCheckByTypeAndAuditAlarm(IN PUNICODE_STRING SubsystemName,
 851                                  IN HANDLE HandleId,
 852                                  IN PUNICODE_STRING ObjectTypeName,
 853                                  IN PUNICODE_STRING ObjectName,
 854                                  IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 855                                  IN PSID PrincipalSelfSid,
 856                                  IN ACCESS_MASK DesiredAccess,
 857                                  IN AUDIT_EVENT_TYPE AuditType,
 858                                  IN ULONG Flags,
 859                                  IN POBJECT_TYPE_LIST ObjectTypeList,
 860                                  IN ULONG ObjectTypeLength,
 861                                  IN PGENERIC_MAPPING GenericMapping,
 862                                  IN BOOLEAN ObjectCreation,
 863                                  OUT PACCESS_MASK GrantedAccess,
 864                                  OUT PNTSTATUS AccessStatus,
 865                                  OUT PBOOLEAN GenerateOnClose)
 866 {
 867     UNIMPLEMENTED;
 868     return STATUS_NOT_IMPLEMENTED;
 869 }
 870
 871 NTSTATUS
 872 NTAPI
 873 NtAccessCheckByTypeResultList(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 874                               IN PSID PrincipalSelfSid,
 875                               IN HANDLE ClientToken,
 876                               IN ACCESS_MASK DesiredAccess,
 877                               IN POBJECT_TYPE_LIST ObjectTypeList,
 878                               IN ULONG ObjectTypeLength,
 879                               IN PGENERIC_MAPPING GenericMapping,
 880                               IN PPRIVILEGE_SET PrivilegeSet,
 881                               IN ULONG PrivilegeSetLength,
 882                               OUT PACCESS_MASK GrantedAccess,
 883                               OUT PNTSTATUS AccessStatus)
 884 {
 885     UNIMPLEMENTED;
 886     return STATUS_NOT_IMPLEMENTED;
 887 }
 888
 889 NTSTATUS
 890 NTAPI
 891 NtAccessCheckByTypeResultListAndAuditAlarm(IN PUNICODE_STRING SubsystemName,
 892                                            IN HANDLE HandleId,
 893                                            IN PUNICODE_STRING ObjectTypeName,
 894                                            IN PUNICODE_STRING ObjectName,
 895                                            IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 896                                            IN PSID PrincipalSelfSid,
 897                                            IN ACCESS_MASK DesiredAccess,
 898                                            IN AUDIT_EVENT_TYPE AuditType,
 899                                            IN ULONG Flags,
 900                                            IN POBJECT_TYPE_LIST ObjectTypeList,
 901                                            IN ULONG ObjectTypeLength,
 902                                            IN PGENERIC_MAPPING GenericMapping,
 903                                            IN BOOLEAN ObjectCreation,
 904                                            OUT PACCESS_MASK GrantedAccess,
 905                                            OUT PNTSTATUS AccessStatus,
 906                                            OUT PBOOLEAN GenerateOnClose)
 907 {
 908     UNIMPLEMENTED;
 909     return STATUS_NOT_IMPLEMENTED;
 910 }
 911
 912 NTSTATUS
 913 NTAPI
 914 NtAccessCheckByTypeResultListAndAuditAlarmByHandle(IN PUNICODE_STRING SubsystemName,
 915                                                    IN HANDLE HandleId,
 916                                                    IN HANDLE ClientToken,
 917                                                    IN PUNICODE_STRING ObjectTypeName,
 918                                                    IN PUNICODE_STRING ObjectName,
 919                                                    IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 920                                                    IN PSID PrincipalSelfSid,
 921                                                    IN ACCESS_MASK DesiredAccess,
 922                                                    IN AUDIT_EVENT_TYPE AuditType,
 923                                                    IN ULONG Flags,
 924                                                    IN POBJECT_TYPE_LIST ObjectTypeList,
 925                                                    IN ULONG ObjectTypeLength,
 926                                                    IN PGENERIC_MAPPING GenericMapping,
 927                                                    IN BOOLEAN ObjectCreation,
 928                                                    OUT PACCESS_MASK GrantedAccess,
 929                                                    OUT PNTSTATUS AccessStatus,
 930                                                    OUT PBOOLEAN GenerateOnClose)
 931 {
 932     UNIMPLEMENTED;
 933     return STATUS_NOT_IMPLEMENTED;
 934 }
 935
 936 /* EOF */