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SetSecurityInfo function

Applies to: desktop apps only

The SetSecurityInfo function sets specified security information in the security descriptor of a specified object. The caller identifies the object by a handle.

To set the SACL of an object, the caller must have the SE_SECURITY_NAME privilege enabled.

Syntax

Copy

DWORD WINAPI SetSecurityInfo(
  __in      HANDLE handle,
  __in      SE_OBJECT_TYPE ObjectType,
  __in      SECURITY_INFORMATION SecurityInfo,
  __in_opt  PSID psidOwner,
  __in_opt  PSID psidGroup,
  __in_opt  PACL pDacl,
  __in_opt  PACL pSacl
);

Parameters

handle [in]

A handle to the object for which to set security information.

ObjectType [in]

A member of the SE_OBJECT_TYPE enumeration that indicates the type of object identified by the handle parameter.

SecurityInfo [in]

A set of bit flags that indicate the type of security information to set. This parameter can be a combination of the SECURITY_INFORMATION bit flags.

Value	Meaning
OWNER_SECURITY_INFORMATION 0x00000001	Include the owner.
GROUP_SECURITY_INFORMATION 0x00000002	Include the primary group.
DACL_SECURITY_INFORMATION 0x00000004	Include the discretionary access control list (DACL).
SACL_SECURITY_INFORMATION 0x00000008	Include the system access control list (SACL).
LABEL_SECURITY_INFORMATION 0x00000010	Include the mandatory integrity label access control entry (ACE).
ATTRIBUTE_SECURITY_INFORMATION 0x00000020	Include the attribute information of the SACL. Windows Server 2008 R2, Windows 7, Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP: This value is not supported.
SCOPE_SECURITY_INFORMATION 0x00000040	Include the central access policy (CAP) identifier of the SACL. Windows Server 2008 R2, Windows 7, Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP: This value is not supported.

psidOwner [in, optional]

A pointer to a SID that identifies the owner of the object. The SID must be one that can be assigned as the owner SID of a security descriptor. The SecurityInfo parameter must include the OWNER_SECURITY_INFORMATION flag. This parameter can be NULL if you are not setting the owner SID.

psidGroup [in, optional]

A pointer to a SID that identifies the primary group of the object. The SecurityInfo parameter must include the GROUP_SECURITY_INFORMATION flag. This parameter can be NULL if you are not setting the primary group SID.

pDacl [in, optional]

A pointer to the new DACL for the object. This parameter is ignored unless the value of the SecurityInfo parameter includes the DACL_SECURITY_INFORMATION flag. If the value of the SecurityInfo parameter includes the DACL_SECURITY_INFORMATION flag and the value of this parameter is set to NULL, full access to the object is granted to everyone. For information about null DACLs, see Creating a DACL.

pSacl [in, optional]

A pointer to the new SACL for the object. The SecurityInfo parameter must include the SACL_SECURITY_INFORMATION flag. This parameter can be NULL if you are not setting the SACL.

Return value

If the function succeeds, the function returns ERROR_SUCCESS.

If the function fails, it returns a nonzero error code defined in WinError.h.

Remarks

If you are setting the discretionary access control list (DACL) or system access control list (SACL) of an object, the system automatically propagates any inheritable access control entries (ACEs) to existing child objects, according to the ACE inheritance rules.

You can use the SetSecurityInfo function with the following types of objects:

Local or remote files or directories on an NTFS
Named pipes
Local or remote printers
Local or remote Windows services
Network shares
Registry keys
Semaphores, events, mutexes, and waitable timers
Processes, threads, jobs, and file-mapping objects
Window stations and desktops
Directory service objects

The SetSecurityInfo function does not reorder access-allowed or access-denied ACEs based on the preferred order. When propagating inheritable ACEs to existing child objects, SetSecurityInfo puts inherited ACEs in order after all of the noninherited ACEs in the DACLs of the child objects.

Note If share access to the children of the object is not available, this function will not propagate unprotected ACEs to the children. For example, if a directory is opened with exclusive access, the operating system will not propagate unprotected ACEs to the subdirectories or files of that directory when the security on the directory is changed.

Requirements