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 this is kernel mode */
 381     if (AccessMode == KernelMode)
 382     {
 383         /* Check if kernel wants everything */
 384         if (DesiredAccess & MAXIMUM_ALLOWED)
 385         {
 386             /* Give it */
 387             *GrantedAccess = GenericMapping->GenericAll;
 388             *GrantedAccess |= (DesiredAccess &~ MAXIMUM_ALLOWED);
 389             *GrantedAccess |= PreviouslyGrantedAccess;
 390         }
 391         else
 392         {
 393             /* Give the desired and previous access */
 394             *GrantedAccess = DesiredAccess | PreviouslyGrantedAccess;
 395         }
 396
 397         /* Success */
 398         *AccessStatus = STATUS_SUCCESS;
 399         return TRUE;
 400     }
 401
 402     /* Check if we didn't get an SD */
 403     if (!SecurityDescriptor)
 404     {
 405         /* Automatic failure */
 406         *AccessStatus = STATUS_ACCESS_DENIED;
 407         return FALSE;
 408     }
 409
 410     /* Check for invalid impersonation */
 411     if ((SubjectSecurityContext->ClientToken) &&
 412         (SubjectSecurityContext->ImpersonationLevel < LowestImpersonationLevel))
 413     {
 414         *AccessStatus = STATUS_BAD_IMPERSONATION_LEVEL;
 415         return FALSE;
 416     }
 417
 418     /* Check for no access desired */
 419     if (!DesiredAccess)
 420     {
 421         /* Check if we had no previous access */
 422         if (!PreviouslyGrantedAccess)
 423         {
 424             /* Then there's nothing to give */
 425             *AccessStatus = STATUS_ACCESS_DENIED;
 426             return FALSE;
 427         }
 428
 429         /* Return the previous access only */
 430         *GrantedAccess = PreviouslyGrantedAccess;
 431         *AccessStatus = STATUS_SUCCESS;
 432         *Privileges = NULL;
 433         return TRUE;
 434     }
 435
 436     /* Acquire the lock if needed */
 437     if (!SubjectContextLocked) SeLockSubjectContext(SubjectSecurityContext);
 438
 439     /* Map given accesses */
 440     RtlMapGenericMask(&DesiredAccess, GenericMapping);
 441     if (PreviouslyGrantedAccess)
 442         RtlMapGenericMask(&PreviouslyGrantedAccess, GenericMapping);
 443
 444
 445
 446     CurrentAccess = PreviouslyGrantedAccess;
 447
 448
 449
 450     Token = SubjectSecurityContext->ClientToken ?
 451     SubjectSecurityContext->ClientToken : SubjectSecurityContext->PrimaryToken;
 452
 453     /* Get the DACL */
 454     Status = RtlGetDaclSecurityDescriptor(SecurityDescriptor,
 455                                           &Present,
 456                                           &Dacl,
 457                                           &Defaulted);
 458     if (!NT_SUCCESS(Status))
 459     {
 460         if (SubjectContextLocked == FALSE)
 461         {
 462             SeUnlockSubjectContext(SubjectSecurityContext);
 463         }
 464
 465         *AccessStatus = Status;
 466         return FALSE;
 467     }
 468
 469     /* RULE 1: Grant desired access if the object is unprotected */
 470     if (Present == TRUE && Dacl == NULL)
 471     {
 472         if (SubjectContextLocked == FALSE)
 473         {
 474             SeUnlockSubjectContext(SubjectSecurityContext);
 475         }
 476
 477         if (DesiredAccess & MAXIMUM_ALLOWED)
 478         {
 479             *GrantedAccess = GenericMapping->GenericAll;
 480             *GrantedAccess |= (DesiredAccess & ~MAXIMUM_ALLOWED);
 481         }
 482         else
 483         {
 484             *GrantedAccess = DesiredAccess | PreviouslyGrantedAccess;
 485         }
 486
 487         *AccessStatus = STATUS_SUCCESS;
 488         return TRUE;
 489     }
 490
 491     CurrentAccess = PreviouslyGrantedAccess;
 492
 493     /* RULE 2: Check token for 'take ownership' privilege */
 494     Privilege.Luid = SeTakeOwnershipPrivilege;
 495     Privilege.Attributes = SE_PRIVILEGE_ENABLED;
 496
 497     if (SepPrivilegeCheck(Token,
 498                           &Privilege,
 499                           1,
 500                           PRIVILEGE_SET_ALL_NECESSARY,
 501                           AccessMode))
 502     {
 503         CurrentAccess |= WRITE_OWNER;
 504         if ((DesiredAccess & ~VALID_INHERIT_FLAGS) ==
 505             (CurrentAccess & ~VALID_INHERIT_FLAGS))
 506         {
 507             if (SubjectContextLocked == FALSE)
 508             {
 509                 SeUnlockSubjectContext(SubjectSecurityContext);
 510             }
 511
 512             *GrantedAccess = CurrentAccess;
 513             *AccessStatus = STATUS_SUCCESS;
 514             return TRUE;
 515         }
 516     }
 517
 518     /* RULE 3: Check whether the token is the owner */
 519     Status = RtlGetOwnerSecurityDescriptor(SecurityDescriptor,
 520                                            &Sid,
 521                                            &Defaulted);
 522     if (!NT_SUCCESS(Status))
 523     {
 524         DPRINT1("RtlGetOwnerSecurityDescriptor() failed (Status %lx)\n", Status);
 525         if (SubjectContextLocked == FALSE)
 526         {
 527             SeUnlockSubjectContext(SubjectSecurityContext);
 528         }
 529
 530         *AccessStatus = Status;
 531         return FALSE;
 532     }
 533
 534     if (Sid && SepSidInToken(Token, Sid))
 535     {
 536         CurrentAccess |= (READ_CONTROL | WRITE_DAC);
 537         if ((DesiredAccess & ~VALID_INHERIT_FLAGS) ==
 538             (CurrentAccess & ~VALID_INHERIT_FLAGS))
 539         {
 540             if (SubjectContextLocked == FALSE)
 541             {
 542                 SeUnlockSubjectContext(SubjectSecurityContext);
 543             }
 544
 545             *GrantedAccess = CurrentAccess;
 546             *AccessStatus = STATUS_SUCCESS;
 547             return TRUE;
 548         }
 549     }
 550
 551     /* Fail if DACL is absent */
 552     if (Present == FALSE)
 553     {
 554         if (SubjectContextLocked == FALSE)
 555         {
 556             SeUnlockSubjectContext(SubjectSecurityContext);
 557         }
 558
 559         *GrantedAccess = 0;
 560         *AccessStatus = STATUS_ACCESS_DENIED;
 561         return FALSE;
 562     }
 563
 564     /* RULE 4: Grant rights according to the DACL */
 565     CurrentAce = (PACE)(Dacl + 1);
 566     for (i = 0; i < Dacl->AceCount; i++)
 567     {
 568         Sid = (PSID)(CurrentAce + 1);
 569         if (CurrentAce->Header.AceType == ACCESS_DENIED_ACE_TYPE)
 570         {
 571             if (SepSidInToken(Token, Sid))
 572             {
 573                 if (SubjectContextLocked == FALSE)
 574                 {
 575                     SeUnlockSubjectContext(SubjectSecurityContext);
 576                 }
 577
 578                 *GrantedAccess = 0;
 579                 *AccessStatus = STATUS_ACCESS_DENIED;
 580                 return FALSE;
 581             }
 582         }
 583
 584         else if (CurrentAce->Header.AceType == ACCESS_ALLOWED_ACE_TYPE)
 585         {
 586             if (SepSidInToken(Token, Sid))
 587             {
 588                 AccessMask = CurrentAce->AccessMask;
 589                 RtlMapGenericMask(&AccessMask, GenericMapping);
 590                 CurrentAccess |= AccessMask;
 591             }
 592         }
 593         else
 594         {
 595             DPRINT1("Unknown Ace type 0x%lx\n", CurrentAce->Header.AceType);
 596         }
 597         CurrentAce = (PACE)((ULONG_PTR)CurrentAce + CurrentAce->Header.AceSize);
 598     }
 599
 600     if (SubjectContextLocked == FALSE)
 601     {
 602         SeUnlockSubjectContext(SubjectSecurityContext);
 603     }
 604
 605     DPRINT("CurrentAccess %08lx\n DesiredAccess %08lx\n",
 606            CurrentAccess, DesiredAccess);
 607
 608     *GrantedAccess = CurrentAccess & DesiredAccess;
 609
 610     if (DesiredAccess & MAXIMUM_ALLOWED)
 611     {
 612         *GrantedAccess = CurrentAccess;
 613         *AccessStatus = STATUS_SUCCESS;
 614         return TRUE;
 615     }
 616     else if ((*GrantedAccess & ~VALID_INHERIT_FLAGS) ==
 617              (DesiredAccess & ~VALID_INHERIT_FLAGS))
 618     {
 619         *AccessStatus = STATUS_SUCCESS;
 620         return TRUE;
 621     }
 622     else
 623     {
 624         DPRINT1("HACK: Should deny access for caller: granted 0x%lx, desired 0x%lx (generic mapping %p).\n",
 625                 *GrantedAccess, DesiredAccess, GenericMapping);
 626         //*AccessStatus = STATUS_ACCESS_DENIED;
 627         //return FALSE;
 628         *AccessStatus = STATUS_SUCCESS;
 629         return TRUE;
 630     }
 631 }
 632
 633 static PSID
 634 SepGetSDOwner(IN PSECURITY_DESCRIPTOR _SecurityDescriptor)
 635 {
 636     PISECURITY_DESCRIPTOR SecurityDescriptor = _SecurityDescriptor;
 637     PSID Owner;
 638
 639     if (SecurityDescriptor->Control & SE_SELF_RELATIVE)
 640         Owner = (PSID)((ULONG_PTR)SecurityDescriptor->Owner +
 641                        (ULONG_PTR)SecurityDescriptor);
 642     else
 643         Owner = (PSID)SecurityDescriptor->Owner;
 644
 645     return Owner;
 646 }
 647
 648 static PSID
 649 SepGetSDGroup(IN PSECURITY_DESCRIPTOR _SecurityDescriptor)
 650 {
 651     PISECURITY_DESCRIPTOR SecurityDescriptor = _SecurityDescriptor;
 652     PSID Group;
 653
 654     if (SecurityDescriptor->Control & SE_SELF_RELATIVE)
 655         Group = (PSID)((ULONG_PTR)SecurityDescriptor->Group +
 656                        (ULONG_PTR)SecurityDescriptor);
 657     else
 658         Group = (PSID)SecurityDescriptor->Group;
 659
 660     return Group;
 661 }
 662
 663
 664 /* PUBLIC FUNCTIONS ***********************************************************/
 665
 666 /*
 667  * @implemented
 668  */
 669 BOOLEAN NTAPI
 670 SeAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 671               IN PSECURITY_SUBJECT_CONTEXT SubjectSecurityContext,
 672               IN BOOLEAN SubjectContextLocked,
 673               IN ACCESS_MASK DesiredAccess,
 674               IN ACCESS_MASK PreviouslyGrantedAccess,
 675               OUT PPRIVILEGE_SET* Privileges,
 676               IN PGENERIC_MAPPING GenericMapping,
 677               IN KPROCESSOR_MODE AccessMode,
 678               OUT PACCESS_MASK GrantedAccess,
 679               OUT PNTSTATUS AccessStatus)
 680 {
 681     /* Call the internal function */
 682     return SepAccessCheck(SecurityDescriptor,
 683                           SubjectSecurityContext,
 684                           SubjectContextLocked,
 685                           DesiredAccess,
 686                           PreviouslyGrantedAccess,
 687                           Privileges,
 688                           GenericMapping,
 689                           AccessMode,
 690                           GrantedAccess,
 691                           AccessStatus,
 692                           SecurityImpersonation);
 693 }
 694
 695 /* SYSTEM CALLS ***************************************************************/
 696
 697 /*
 698  * @implemented
 699  */
 700 NTSTATUS
 701 NTAPI
 702 NtAccessCheck(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 703               IN HANDLE TokenHandle,
 704               IN ACCESS_MASK DesiredAccess,
 705               IN PGENERIC_MAPPING GenericMapping,
 706               OUT PPRIVILEGE_SET PrivilegeSet OPTIONAL,
 707               IN OUT PULONG PrivilegeSetLength,
 708               OUT PACCESS_MASK GrantedAccess,
 709               OUT PNTSTATUS AccessStatus)
 710 {
 711     SECURITY_SUBJECT_CONTEXT SubjectSecurityContext;
 712     KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
 713     PTOKEN Token;
 714     NTSTATUS Status;
 715     PAGED_CODE();
 716
 717     /* Check if this is kernel mode */
 718     if (PreviousMode == KernelMode)
 719     {
 720         /* Check if kernel wants everything */
 721         if (DesiredAccess & MAXIMUM_ALLOWED)
 722         {
 723             /* Give it */
 724             *GrantedAccess = GenericMapping->GenericAll;
 725             *GrantedAccess |= (DesiredAccess &~ MAXIMUM_ALLOWED);
 726         }
 727         else
 728         {
 729             /* Just give the desired access */
 730             *GrantedAccess = DesiredAccess;
 731         }
 732
 733         /* Success */
 734         *AccessStatus = STATUS_SUCCESS;
 735         return STATUS_SUCCESS;
 736     }
 737
 738     /* Protect probe in SEH */
 739     _SEH2_TRY
 740     {
 741         /* Probe all pointers */
 742         ProbeForRead(GenericMapping, sizeof(GENERIC_MAPPING), sizeof(ULONG));
 743         ProbeForRead(PrivilegeSetLength, sizeof(ULONG), sizeof(ULONG));
 744         ProbeForWrite(PrivilegeSet, *PrivilegeSetLength, sizeof(ULONG));
 745         ProbeForWrite(GrantedAccess, sizeof(ACCESS_MASK), sizeof(ULONG));
 746         ProbeForWrite(AccessStatus, sizeof(NTSTATUS), sizeof(ULONG));
 747     }
 748     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 749     {
 750         /* Return the exception code */
 751         _SEH2_YIELD(return _SEH2_GetExceptionCode());
 752     }
 753     _SEH2_END;
 754
 755     /* Check for unmapped access rights */
 756     if (DesiredAccess & (GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL))
 757         return STATUS_GENERIC_NOT_MAPPED;
 758
 759     /* Reference the token */
 760     Status = ObReferenceObjectByHandle(TokenHandle,
 761                                        TOKEN_QUERY,
 762                                        SepTokenObjectType,
 763                                        PreviousMode,
 764                                        (PVOID*)&Token,
 765                                        NULL);
 766     if (!NT_SUCCESS(Status))
 767     {
 768         DPRINT("Failed to reference token (Status %lx)\n", Status);
 769         return Status;
 770     }
 771
 772     /* Check token type */
 773     if (Token->TokenType != TokenImpersonation)
 774     {
 775         DPRINT("No impersonation token\n");
 776         ObDereferenceObject(Token);
 777         return STATUS_NO_IMPERSONATION_TOKEN;
 778     }
 779
 780     /* Check the impersonation level */
 781     if (Token->ImpersonationLevel < SecurityIdentification)
 782     {
 783         DPRINT("Impersonation level < SecurityIdentification\n");
 784         ObDereferenceObject(Token);
 785         return STATUS_BAD_IMPERSONATION_LEVEL;
 786     }
 787
 788     /* Check security descriptor for valid owner and group */
 789     if (SepGetSDOwner(SecurityDescriptor)== NULL ||
 790         SepGetSDGroup(SecurityDescriptor) == NULL)
 791     {
 792         DPRINT("Security Descriptor does not have a valid group or owner\n");
 793         ObDereferenceObject(Token);
 794         return STATUS_INVALID_SECURITY_DESCR;
 795     }
 796
 797     /* Set up the subject context, and lock it */
 798     SubjectSecurityContext.ClientToken = Token;
 799     SubjectSecurityContext.ImpersonationLevel = Token->ImpersonationLevel;
 800     SubjectSecurityContext.PrimaryToken = NULL;
 801     SubjectSecurityContext.ProcessAuditId = NULL;
 802     SeLockSubjectContext(&SubjectSecurityContext);
 803
 804     /* Now perform the access check */
 805     SepAccessCheck(SecurityDescriptor,
 806                    &SubjectSecurityContext,
 807                    TRUE,
 808                    DesiredAccess,
 809                    0,
 810                    &PrivilegeSet, //FIXME
 811                    GenericMapping,
 812                    PreviousMode,
 813                    GrantedAccess,
 814                    AccessStatus,
 815                    SecurityIdentification);
 816
 817     /* Unlock subject context */
 818     SeUnlockSubjectContext(&SubjectSecurityContext);
 819
 820     /* Dereference the token */
 821     ObDereferenceObject(Token);
 822
 823     /* Check succeeded */
 824     return STATUS_SUCCESS;
 825 }
 826
 827
 828 NTSTATUS
 829 NTAPI
 830 NtAccessCheckByType(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 831                     IN PSID PrincipalSelfSid,
 832                     IN HANDLE ClientToken,
 833                     IN ACCESS_MASK DesiredAccess,
 834                     IN POBJECT_TYPE_LIST ObjectTypeList,
 835                     IN ULONG ObjectTypeLength,
 836                     IN PGENERIC_MAPPING GenericMapping,
 837                     IN PPRIVILEGE_SET PrivilegeSet,
 838                     IN ULONG PrivilegeSetLength,
 839                     OUT PACCESS_MASK GrantedAccess,
 840                     OUT PNTSTATUS AccessStatus)
 841 {
 842     UNIMPLEMENTED;
 843     return STATUS_NOT_IMPLEMENTED;
 844 }
 845
 846 NTSTATUS
 847 NTAPI
 848 NtAccessCheckByTypeAndAuditAlarm(IN PUNICODE_STRING SubsystemName,
 849                                  IN HANDLE HandleId,
 850                                  IN PUNICODE_STRING ObjectTypeName,
 851                                  IN PUNICODE_STRING ObjectName,
 852                                  IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 853                                  IN PSID PrincipalSelfSid,
 854                                  IN ACCESS_MASK DesiredAccess,
 855                                  IN AUDIT_EVENT_TYPE AuditType,
 856                                  IN ULONG Flags,
 857                                  IN POBJECT_TYPE_LIST ObjectTypeList,
 858                                  IN ULONG ObjectTypeLength,
 859                                  IN PGENERIC_MAPPING GenericMapping,
 860                                  IN BOOLEAN ObjectCreation,
 861                                  OUT PACCESS_MASK GrantedAccess,
 862                                  OUT PNTSTATUS AccessStatus,
 863                                  OUT PBOOLEAN GenerateOnClose)
 864 {
 865     UNIMPLEMENTED;
 866     return STATUS_NOT_IMPLEMENTED;
 867 }
 868
 869 NTSTATUS
 870 NTAPI
 871 NtAccessCheckByTypeResultList(IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 872                               IN PSID PrincipalSelfSid,
 873                               IN HANDLE ClientToken,
 874                               IN ACCESS_MASK DesiredAccess,
 875                               IN POBJECT_TYPE_LIST ObjectTypeList,
 876                               IN ULONG ObjectTypeLength,
 877                               IN PGENERIC_MAPPING GenericMapping,
 878                               IN PPRIVILEGE_SET PrivilegeSet,
 879                               IN ULONG PrivilegeSetLength,
 880                               OUT PACCESS_MASK GrantedAccess,
 881                               OUT PNTSTATUS AccessStatus)
 882 {
 883     UNIMPLEMENTED;
 884     return STATUS_NOT_IMPLEMENTED;
 885 }
 886
 887 NTSTATUS
 888 NTAPI
 889 NtAccessCheckByTypeResultListAndAuditAlarm(IN PUNICODE_STRING SubsystemName,
 890                                            IN HANDLE HandleId,
 891                                            IN PUNICODE_STRING ObjectTypeName,
 892                                            IN PUNICODE_STRING ObjectName,
 893                                            IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 894                                            IN PSID PrincipalSelfSid,
 895                                            IN ACCESS_MASK DesiredAccess,
 896                                            IN AUDIT_EVENT_TYPE AuditType,
 897                                            IN ULONG Flags,
 898                                            IN POBJECT_TYPE_LIST ObjectTypeList,
 899                                            IN ULONG ObjectTypeLength,
 900                                            IN PGENERIC_MAPPING GenericMapping,
 901                                            IN BOOLEAN ObjectCreation,
 902                                            OUT PACCESS_MASK GrantedAccess,
 903                                            OUT PNTSTATUS AccessStatus,
 904                                            OUT PBOOLEAN GenerateOnClose)
 905 {
 906     UNIMPLEMENTED;
 907     return STATUS_NOT_IMPLEMENTED;
 908 }
 909
 910 NTSTATUS
 911 NTAPI
 912 NtAccessCheckByTypeResultListAndAuditAlarmByHandle(IN PUNICODE_STRING SubsystemName,
 913                                                    IN HANDLE HandleId,
 914                                                    IN HANDLE ClientToken,
 915                                                    IN PUNICODE_STRING ObjectTypeName,
 916                                                    IN PUNICODE_STRING ObjectName,
 917                                                    IN PSECURITY_DESCRIPTOR SecurityDescriptor,
 918                                                    IN PSID PrincipalSelfSid,
 919                                                    IN ACCESS_MASK DesiredAccess,
 920                                                    IN AUDIT_EVENT_TYPE AuditType,
 921                                                    IN ULONG Flags,
 922                                                    IN POBJECT_TYPE_LIST ObjectTypeList,
 923                                                    IN ULONG ObjectTypeLength,
 924                                                    IN PGENERIC_MAPPING GenericMapping,
 925                                                    IN BOOLEAN ObjectCreation,
 926                                                    OUT PACCESS_MASK GrantedAccess,
 927                                                    OUT PNTSTATUS AccessStatus,
 928                                                    OUT PBOOLEAN GenerateOnClose)
 929 {
 930     UNIMPLEMENTED;
 931     return STATUS_NOT_IMPLEMENTED;
 932 }
 933
 934 /* EOF */