/// <summary>
/// Returns a value indicating if the principal is authorized for the requested access in any given security descriptor. The access evaluated is the logical concatination of all the supplied security descriptors
/// </summary>
/// <param name="securityDescriptors">The security descriptors to check</param>
/// <param name="requestedAccessMask">The access mask desired</param>
/// <param name="selfSid">The SID to use when the security descriptor contains the 'SELF' principal</param>
/// <returns>True if the request is allowed, false if it is denied.</returns>
public bool AccessCheck(IList <GenericSecurityDescriptor> securityDescriptors, int requestedAccessMask, SecurityIdentifier selfSid)
{
if (securityDescriptors == null)
{
throw new ArgumentNullException(nameof(securityDescriptors));
}
if (securityDescriptors.Count == 0)
{
return(false);
}
GenericSecurityDescriptor primarySecurityDescriptor = securityDescriptors[0];
List <GenericSecurityDescriptor> otherSecurityDescriptors = securityDescriptors.ToList();
otherSecurityDescriptors.RemoveAt(0);
byte[] primarySecurityDescriptorBytes = primarySecurityDescriptor.ToBytes();
if (primarySecurityDescriptor.Owner == null)
{
throw new Win32Exception(87, "The security descriptor must include an owner");
}
AuthzAccessRequest request = new AuthzAccessRequest();
request.PrincipalSelfSid = selfSid?.ToBytes();
request.DesiredAccess = requestedAccessMask;
AuthzAccessReply reply = new AuthzAccessReply();
SafeAllocHGlobalHandle accessMaskReply = new SafeAllocHGlobalHandle(Marshal.SizeOf <uint>());
SafeAllocHGlobalHandle errorReply = new SafeAllocHGlobalHandle(Marshal.SizeOf <uint>());
SafeAllocHGlobalHandle saclReply = new SafeAllocHGlobalHandle(Marshal.SizeOf <uint>());
reply.ResultListLength = 1;
reply.GrantedAccessMask = accessMaskReply.DangerousGetHandle();
reply.SaclEvaluationResults = saclReply.DangerousGetHandle();
reply.Error = errorReply.DangerousGetHandle();
IntPtr pOthers = IntPtr.Zero;
int othersCount = otherSecurityDescriptors?.Count ?? 0;
if (othersCount > 0)
{
LpArrayOfByteArrayConverter r = new LpArrayOfByteArrayConverter(otherSecurityDescriptors.Select(t => t.ToBytes()).ToList());
pOthers = r.Ptr;
}
if (!NativeMethods.AuthzAccessCheck(AuthzAccessCheckFlags.None, this.authzContext, ref request, IntPtr.Zero, primarySecurityDescriptorBytes, pOthers, othersCount, ref reply, IntPtr.Zero))
{
throw new AuthorizationContextException("AuthzAccessCheck failed", new Win32Exception(Marshal.GetLastWin32Error()));
}
int maskResult = Marshal.ReadInt32(reply.GrantedAccessMask);
int error = Marshal.ReadInt32(reply.Error);
if (error == 0)
{
return((requestedAccessMask & maskResult) == requestedAccessMask);
}
return(false);
}