406 lines
9.8 KiB
C
406 lines
9.8 KiB
C
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/*********************************************************************/
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/** Copyright(c) 1995 Microsoft Corporation. **/
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/*********************************************************************/
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//***
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//
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// Filename: security.c
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//
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// Description: This module contains code that will create and delete the
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// security object. It will also contain access checking calls.
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//
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// History:
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// June 21,1995. NarenG Created original version.
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//
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// NOTE: ??? The lpdwAccessStatus parameter for AccessCheckAndAuditAlarm
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// returns junk. ???
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//
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#include "dimsvcp.h"
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#include <rpc.h>
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#include <ntseapi.h>
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#include <ntlsa.h>
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#include <ntsam.h>
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#include <ntsamp.h>
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typedef struct _DIM_SECURITY_OBJECT
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{
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LPWSTR lpwsObjectName;
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LPWSTR lpwsObjectType;
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GENERIC_MAPPING GenericMapping;
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PSECURITY_DESCRIPTOR pSecurityDescriptor;
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} DIM_SECURITY_OBJECT, PDIM_SECURITY_OBJECT;
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static DIM_SECURITY_OBJECT DimSecurityObject;
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#define DIMSVC_SECURITY_OBJECT TEXT("DimSvcAdminApi");
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#define DIMSVC_SECURITY_OBJECT_TYPE TEXT("Security");
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//**
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//
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// Call: DimSecObjCreate
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//
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// Returns: NO_ERROR - success
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// ERROR_NOT_ENOUGH_MEMORY
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// non-zero returns from security functions
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//
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// Description: This procedure will set up the security object that will
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// be used to check to see if an RPC client is an administrator
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// for the local machine.
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//
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DWORD
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DimSecObjCreate(
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VOID
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)
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{
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PSID pAdminSid = NULL;
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PSID pLocalSystemSid = NULL;
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PSID pServerOpSid = NULL;
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PACL pDacl = NULL;
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HANDLE hProcessToken = NULL;
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PULONG pSubAuthority;
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SID_IDENTIFIER_AUTHORITY SidIdentifierNtAuth = SECURITY_NT_AUTHORITY;
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SECURITY_DESCRIPTOR SecurityDescriptor;
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DWORD dwRetCode;
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DWORD cbDaclSize;
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//
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// Set up security object
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//
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DimSecurityObject.lpwsObjectName = DIMSVC_SECURITY_OBJECT;
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DimSecurityObject.lpwsObjectType = DIMSVC_SECURITY_OBJECT_TYPE;
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//
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// Generic mapping structure for the security object
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// All generic access types are allowed API access.
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//
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DimSecurityObject.GenericMapping.GenericRead = STANDARD_RIGHTS_READ |
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DIMSVC_ALL_ACCESS;
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DimSecurityObject.GenericMapping.GenericWrite = STANDARD_RIGHTS_WRITE |
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DIMSVC_ALL_ACCESS;
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DimSecurityObject.GenericMapping.GenericExecute =
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STANDARD_RIGHTS_EXECUTE |
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DIMSVC_ALL_ACCESS;
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DimSecurityObject.GenericMapping.GenericAll = DIMSVC_ALL_ACCESS;
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do
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{
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dwRetCode = NO_ERROR;
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//
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// Set up the SID for the admins that will be allowed to have
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// access. This SID will have 2 sub-authorities
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// SECURITY_BUILTIN_DOMAIN_RID and DOMAIN_ALIAS_ADMIN_RID.
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//
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pAdminSid = (PSID)LOCAL_ALLOC( LPTR, GetSidLengthRequired( 2 ) );
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if ( pAdminSid == NULL )
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{
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dwRetCode = ERROR_NOT_ENOUGH_MEMORY;
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break;
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}
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if ( !InitializeSid( pAdminSid, &SidIdentifierNtAuth, 2 ) )
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Set the sub-authorities
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//
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pSubAuthority = GetSidSubAuthority( pAdminSid, 0 );
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*pSubAuthority = SECURITY_BUILTIN_DOMAIN_RID;
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pSubAuthority = GetSidSubAuthority( pAdminSid, 1 );
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*pSubAuthority = DOMAIN_ALIAS_RID_ADMINS;
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//
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// Create the server operators SID
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//
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pServerOpSid = (PSID)LOCAL_ALLOC( LPTR, GetSidLengthRequired( 2 ) );
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if ( pServerOpSid == NULL )
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{
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dwRetCode = ERROR_NOT_ENOUGH_MEMORY;
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break;
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}
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if ( !InitializeSid( pServerOpSid, &SidIdentifierNtAuth, 2 ) )
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Set the sub-authorities
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//
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pSubAuthority = GetSidSubAuthority( pServerOpSid, 0 );
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*pSubAuthority = SECURITY_BUILTIN_DOMAIN_RID;
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pSubAuthority = GetSidSubAuthority( pServerOpSid, 1 );
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*pSubAuthority = DOMAIN_ALIAS_RID_SYSTEM_OPS;
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//
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// Create the LocalSystemSid which will be the owner and the primary
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// group of the security object.
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//
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pLocalSystemSid = (PSID)LOCAL_ALLOC( LPTR, GetSidLengthRequired( 1 ) );
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if ( pLocalSystemSid == NULL )
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{
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dwRetCode = ERROR_NOT_ENOUGH_MEMORY;
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break;
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}
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if ( !InitializeSid( pLocalSystemSid, &SidIdentifierNtAuth, 1 ) )
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Set the sub-authorities
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//
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pSubAuthority = GetSidSubAuthority( pLocalSystemSid, 0 );
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*pSubAuthority = SECURITY_LOCAL_SYSTEM_RID;
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//
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// Set up the DACL that will allow admins with the above SID all access
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// It should be large enough to hold all ACEs.
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//
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cbDaclSize = sizeof(ACL) + ( sizeof(ACCESS_ALLOWED_ACE) * 2 ) +
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GetLengthSid(pAdminSid) + GetLengthSid(pServerOpSid);
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if ( (pDacl = (PACL)LOCAL_ALLOC( LPTR, cbDaclSize ) ) == NULL )
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{
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dwRetCode = ERROR_NOT_ENOUGH_MEMORY;
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break;
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}
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if ( !InitializeAcl( pDacl, cbDaclSize, ACL_REVISION2 ) )
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Add the ACE to the DACL
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//
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if ( !AddAccessAllowedAce( pDacl,
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ACL_REVISION2,
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DIMSVC_ALL_ACCESS, // What the admin can do
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pAdminSid ))
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{
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dwRetCode = GetLastError();
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break;
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}
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if ( !AddAccessAllowedAce( pDacl,
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ACL_REVISION2,
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DIMSVC_ALL_ACCESS, // What the admin can do
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pServerOpSid ))
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Create the security descriptor an put the DACL in it.
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//
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if ( !InitializeSecurityDescriptor( &SecurityDescriptor, 1 ))
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{
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dwRetCode = GetLastError();
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break;
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}
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if ( !SetSecurityDescriptorDacl( &SecurityDescriptor,
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TRUE,
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pDacl,
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FALSE ) )
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Set owner for the descriptor
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//
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if ( !SetSecurityDescriptorOwner( &SecurityDescriptor,
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pLocalSystemSid,
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FALSE ) )
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Set group for the descriptor
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//
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if ( !SetSecurityDescriptorGroup( &SecurityDescriptor,
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pLocalSystemSid,
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FALSE ) )
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Get token for the current process
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//
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if ( !OpenProcessToken( GetCurrentProcess(),
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TOKEN_QUERY,
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&hProcessToken ))
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{
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dwRetCode = GetLastError();
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break;
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}
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//
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// Create a security object. This is really just a security descriptor
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// is self-relative form. This procedure will allocate memory for this
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// security descriptor and copy all in the information passed in. This
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// allows us to free all dynamic memory allocated.
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//
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if ( !CreatePrivateObjectSecurity(
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NULL,
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&SecurityDescriptor,
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&(DimSecurityObject.pSecurityDescriptor),
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FALSE,
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hProcessToken,
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&(DimSecurityObject.GenericMapping)
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))
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dwRetCode = GetLastError();
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} while( FALSE );
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//
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// Free up the dynamic memory
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//
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if ( pLocalSystemSid != NULL )
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LOCAL_FREE( pLocalSystemSid );
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if ( pAdminSid != NULL )
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LOCAL_FREE( pAdminSid );
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if ( pServerOpSid != NULL )
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LOCAL_FREE( pServerOpSid );
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if ( pDacl != NULL )
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LOCAL_FREE( pDacl );
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if ( hProcessToken != NULL )
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CloseHandle( hProcessToken );
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return( dwRetCode );
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}
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//**
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//
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// Call: DimSecObjDelete
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//
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// Returns: NO_ERROR - success
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// non-zero returns from security functions
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//
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// Description: Will destroy a valid security descriptor.
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//
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DWORD
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DimSecObjDelete(
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VOID
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)
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{
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if ( !IsValidSecurityDescriptor( DimSecurityObject.pSecurityDescriptor))
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return( NO_ERROR );
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if (!DestroyPrivateObjectSecurity( &DimSecurityObject.pSecurityDescriptor))
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return( GetLastError() );
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return( NO_ERROR );
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}
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//**
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//
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// Call: DimSecObjAccessCheck
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//
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// Returns: NO_ERROR - success
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// non-zero returns from security functions
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//
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// Description: This procedure will first impersonate the client, then
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// check to see if the client has the desired access to the
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// security object. If he/she does then the AccessStatus
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// variable will be set to NO_ERROE otherwise it will be
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// set to ERROR_ACCESS_DENIED. It will the revert to self and
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// return.
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//
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DWORD
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DimSecObjAccessCheck(
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IN DWORD DesiredAccess,
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OUT LPDWORD lpdwAccessStatus
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)
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{
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DWORD dwRetCode;
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ACCESS_MASK GrantedAccess;
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BOOL fGenerateOnClose;
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//
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// Impersonate the client
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//
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dwRetCode = RpcImpersonateClient( NULL );
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if ( dwRetCode != RPC_S_OK )
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return( dwRetCode );
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dwRetCode = AccessCheckAndAuditAlarm(
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DIM_SERVICE_NAME,
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NULL,
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DimSecurityObject.lpwsObjectType,
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DimSecurityObject.lpwsObjectName,
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DimSecurityObject.pSecurityDescriptor,
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DesiredAccess,
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&(DimSecurityObject.GenericMapping),
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FALSE,
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&GrantedAccess,
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(LPBOOL)lpdwAccessStatus,
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&fGenerateOnClose
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);
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RpcRevertToSelf();
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if ( !dwRetCode )
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return( GetLastError() );
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//
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// Check if desired access == granted Access
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//
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if ( DesiredAccess != GrantedAccess )
|
|||
|
|
*lpdwAccessStatus = ERROR_ACCESS_DENIED;
|
|||
|
|
else
|
|||
|
|
*lpdwAccessStatus = NO_ERROR;
|
|||
|
|
|
|||
|
|
return( NO_ERROR );
|
|||
|
|
}
|