Exemplo n.º 1
0
 public DesktopSecurity(Desktop desktop, AccessControlSections includeSections)
     : base(false /* isContainer */, ResourceType.WindowObject, desktop, includeSections)
 {
     this.desktop = desktop;
 }
Exemplo n.º 2
0
        /// <summary>
        /// Creates a new desktop with minimal rights.
        /// </summary>
        /// <param name="tracer">A tracer instance.</param>
        /// <returns>The desktop instance.</returns>
        public static Desktop Create(ITracer tracer, string mandatoryLevelSacl)
        {
            using (var disposalEscrow = new DisposalEscrow())
                using (Desktop currentDesktop = Desktop.GetCurrent())
                {
                    try
                    {
                        string name = "sbox" + DateTime.UtcNow.Ticks;
                        tracer.Trace(nameof(Desktop), "Creating desktop '{0}'", name);

                        SECURITY_ATTRIBUTES securityAttributes = null;
                        if (mandatoryLevelSacl != null)
                        {
                            tracer.Trace(nameof(Desktop), "Generating security attributes for '{0}'", mandatoryLevelSacl);

                            // If a security descriptor (in SDDL form) was provided convert it to binary form and then marshal
                            // it into native memory to that we can pass it in to the native method.
                            var rawSecurityDescriptor = new RawSecurityDescriptor(mandatoryLevelSacl);

                            var binaryForm = new byte[rawSecurityDescriptor.BinaryLength];
                            rawSecurityDescriptor.GetBinaryForm(binaryForm, 0 /* offset */);

                            var nativeBinaryForm = disposalEscrow.Add(new SafeHGlobalBuffer(binaryForm.Length));
                            Marshal.Copy(binaryForm, 0 /* startIndex */, nativeBinaryForm.DangerousGetHandle(), binaryForm.Length);

                            securityAttributes = new SECURITY_ATTRIBUTES {
                                lpSecurityDescriptor = nativeBinaryForm.DangerousGetHandle()
                            };
                        }

                        // Since we're creating the desktop we'll ask for all rights so that we have the ability to modify security as
                        // required. Since the created desktop will be referenced by name when creating the process this will not impact
                        // the security of the desktop.
                        IntPtr unsafeDesktopHandle = Methods.CreateDesktop(
                            name,
                            device: null,
                            deviceMode: null,
                            flags: 0,
                            accessMask: DESKTOP_RIGHTS.GENERIC_ALL,
                            attributes: securityAttributes);
                        if (unsafeDesktopHandle == IntPtr.Zero)
                        {
                            throw
                                new SandboxException(
                                    $"Unable to create new desktop",
                                    new Win32Exception());
                        }

                        tracer.Trace(nameof(Desktop), "Desktop successfully created");

                        return(new Desktop(unsafeDesktopHandle, ownsHandle: true)
                        {
                            Name = name,
                        });
                    }
                    finally
                    {
                        // Since CreateDesktop automatically switches to the new desktop we need to make sure that we switch back
                        // to the original one.
                        currentDesktop.MakeCurrent();
                    }
                }
        }