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GetFileSecurity info  Overview  Group

The GetFileSecurity function obtains specified information about the security of a file or directory. The information obtained is constrained by the callerís access rights and privileges.

BOOL GetFileSecurity(

    LPCTSTR lpFileName,

// address of string for file name

    SECURITY_INFORMATION RequestedInformation,

// requested information

    PSECURITY_DESCRIPTOR pSecurityDescriptor,

// address of security descriptor

    DWORD nLength,

// size of security descriptor buffer

    LPDWORD lpnLengthNeeded 

// address of required size of buffer



Points to a null-terminated string specifying the file or directory for which security information is retrieved.
Specifies a SECURITY_INFORMATION value that identifies the security information being requested.
Points to a buffer that receives a copy of the security descriptor of the object specified by the lpFileName parameter. The calling process must have the right to view the specified aspects of the objectís security status. The SECURITY_DESCRIPTOR structure is returned in self-relative format.
Specifies the size, in bytes, of the buffer pointed to by the pSecurityDescriptor parameter.
Points to a variable the function sets to zero if the file descriptor is copied successfully. If the buffer is too small for the security descriptor, this variable receives the number of bytes required. If this variableís value is greater than that of the nLength parameter when the function returns, none of the security descriptor is copied to the buffer.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


To read the owner, group, or DACL from the security descriptor for the specified file or directory, the DACL for the file or directory must grant READ_CONTROL access to the caller or the caller must be the owner of the file or directory.

To read the system access-control list (SACL) of a file or directory, the SE_SECURITY_NAME privilege must be enabled for the calling process.

See Also

GetKernelObjectSecurity, GetPrivateObjectSecurity, GetUserObjectSecurity, SECURITY_DESCRIPTOR, SECURITY_INFORMATION, SetFileSecurity


file: /Techref/os/win/api/win32/func/src/f31_22.htm, 4KB, , updated: 2000/4/7 12:19, local time: 2024/6/22 14:53,

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