The SetSecurityDescriptorDacl function sets information in a discretionary access-control list (ACL). If a discretionary ACL is already present in the security descriptor, it is replaced.
BOOL SetSecurityDescriptorDacl(
PSECURITY_DESCRIPTOR pSecurityDescriptor, |
// address of security descriptor |
BOOL bDaclPresent, |
// flag for presence of discretionary ACL |
PACL pDacl, |
// address of discretionary ACL |
BOOL bDaclDefaulted |
// flag for default discretionary ACL |
); |
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.
There is an important difference between an empty and a nonexistent discretionary ACL. When a discretionary ACL is empty, it contains no access-control entries and no access rights have been explicitly granted. As a result, access to the object is implicitly denied. When an object has no DACL, on the other hand, no protection is assigned to the object, and any access request is granted.
There are three possible outcomes in different configurations of the bDaclPresent flag and the pDacl parameter:
ACL, GetSecurityDescriptorDacl, InitializeSecurityDescriptor, IsValidSecurityDescriptor, SECURITY_DESCRIPTOR, SECURITY_DESCRIPTOR_CONTROL, SetSecurityDescriptorGroup, SetSecurityDescriptorOwner, SetSecurityDescriptorSacl
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