MeshCentral/agents/modules_meshcore/win-virtual-terminal.js

/*
Copyright 2019 Intel Corporation

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

var PROC_THREAD_ATTRIBUTE_PSEUDOCONSOLE = 0x00020016;
var EXTENDED_STARTUPINFO_PRESENT = 0x00080000;
var HEAP_ZERO_MEMORY = 0x00000008;

var duplex = require('stream').Duplex;

function vt()
{
    this._ObjectID = 'win-virtual-terminal';
    Object.defineProperty(this, 'supported', {
        value: (function ()
        {
            var gm = require('_GenericMarshal');
            var k32 = gm.CreateNativeProxy('kernel32.dll');
            try
            {
                k32.CreateMethod('CreatePseudoConsole');
            }
            catch(e)
            {
                return (false);
            }
            return (true);
        })()
    });
    this.Create = function Create(path, width, height)
    {
        if (!this.supported) { throw ('This build of Windows does not have support for PseudoConsoles'); }
        if (!width) { width = 80; }
        if (!height) { height = 25; }

        var GM = require('_GenericMarshal');
        var k32 = GM.CreateNativeProxy('kernel32.dll');
        k32.CreateMethod('CancelIoEx');                         // https://learn.microsoft.com/en-us/windows/win32/fileio/cancelioex-func
        k32.CreateMethod('CreatePipe');                         // https://learn.microsoft.com/en-us/windows/win32/api/namedpipeapi/nf-namedpipeapi-createpipe
        k32.CreateMethod('CreateProcessW');                     // https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-createprocessw
        k32.CreateMethod('CreatePseudoConsole');                // https://learn.microsoft.com/en-us/windows/console/createpseudoconsole
        k32.CreateMethod('CloseHandle');                        // https://learn.microsoft.com/en-us/windows/win32/api/handleapi/nf-handleapi-closehandle
        k32.CreateMethod('ClosePseudoConsole');                 // https://learn.microsoft.com/en-us/windows/console/closepseudoconsole
        k32.CreateMethod('GetProcessHeap');                     // https://learn.microsoft.com/en-us/windows/win32/api/heapapi/nf-heapapi-getprocessheap
        k32.CreateMethod('HeapAlloc');                          // https://learn.microsoft.com/en-us/windows/win32/api/heapapi/nf-heapapi-heapalloc
        k32.CreateMethod('InitializeProcThreadAttributeList');  // https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-initializeprocthreadattributelist
        k32.CreateMethod('ResizePseudoConsole');                // https://learn.microsoft.com/en-us/windows/console/resizepseudoconsole
        k32.CreateMethod('UpdateProcThreadAttribute');          // https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-updateprocthreadattribute
        k32.CreateMethod('WriteFile');                          // https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-writefile
        k32.CreateMethod('ReadFile');                           // https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-readfile
        k32.CreateMethod('TerminateProcess');                   // https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-terminateprocess

        var ret = { _h: GM.CreatePointer(), _consoleInput: GM.CreatePointer(), _consoleOutput: GM.CreatePointer(), _input: GM.CreatePointer(), _output: GM.CreatePointer(), k32: k32 };
        var attrSize = GM.CreateVariable(8);
        var attrList;
        var pi = GM.CreateVariable(GM.PointerSize == 4 ? 16 : 24);

        // Create the necessary pipes
        if (k32.CreatePipe(ret._consoleInput, ret._input, 0, 0).Val == 0) { console.log('PIPE/FAIL'); }
        if (k32.CreatePipe(ret._output, ret._consoleOutput, 0, 0).Val == 0) { console.log('PIPE/FAIL'); }


        if (k32.CreatePseudoConsole((height << 16) | width, ret._consoleInput.Deref(), ret._consoleOutput.Deref(), 0, ret._h).Val != 0)
        {
            throw ('Error calling CreatePseudoConsole()');
        }

        //
        // Reference for STARTUPINFOEXW
        // https://learn.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-startupinfoexw
        //

        //
        // Reference for STARTUPINFOW
        // https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/ns-processthreadsapi-startupinfow
        //

        k32.InitializeProcThreadAttributeList(0, 1, 0, attrSize);
        attrList = GM.CreateVariable(attrSize.toBuffer().readUInt32LE());
        var startupinfoex = GM.CreateVariable(GM.PointerSize == 8 ? 112 : 72);                                          // Create Structure, 64 bits is 112 bytes, 32 bits is 72 bytes
        startupinfoex.toBuffer().writeUInt32LE(GM.PointerSize == 8 ? 112 : 72, 0);                                      // Write buffer size
        attrList.pointerBuffer().copy(startupinfoex.Deref(GM.PointerSize == 8 ? 104 : 68, GM.PointerSize).toBuffer());  // Write the reference to STARTUPINFOEX

        if (k32.InitializeProcThreadAttributeList(attrList, 1, 0, attrSize).Val != 0)
        {
            if (k32.UpdateProcThreadAttribute(attrList, 0, PROC_THREAD_ATTRIBUTE_PSEUDOCONSOLE, ret._h.Deref(), GM.PointerSize, 0, 0).Val != 0)
            {
                if (k32.CreateProcessW(0, GM.CreateVariable(path, { wide: true }), 0, 0, 1, EXTENDED_STARTUPINFO_PRESENT, 0, 0, startupinfoex, pi).Val != 0) // Create the process to run in the pseudoconsole
                {
                    //
                    // Create a Stream Object, to be able to read/write data to the pseudoconsole
                    //
                    ret._startupinfoex = startupinfoex;
                    ret._process = pi.Deref(0);
                    ret._pid = pi.Deref(GM.PointerSize == 4 ? 8 : 16, 4).toBuffer().readUInt32LE();
                    var ds = new duplex(
                    {
                        'write': function (chunk, flush)
                        {
                            var written = require('_GenericMarshal').CreateVariable(4);
                            this.terminal.k32.WriteFile(this.terminal._input.Deref(), require('_GenericMarshal').CreateVariable(chunk), chunk.length, written, 0);
                            flush();
                            return (true);
                        },
                        'final': function (flush)
                        {
                            if (this.terminal._process)
                            {
                                this.terminal._process = null;
                                k32.ClosePseudoConsole(this._obj._h.Deref());
                            }
                            flush();
                        }
                    });
                    
                    //
                    // The ProcessInfo object is signaled when the process exits
                    //
                    ds._obj = ret;
                    ret._waiter = require('DescriptorEvents').addDescriptor(pi.Deref(0));
                    ret._waiter.ds = ds;
                    ret._waiter._obj = ret;
                    ret._waiter.on('signaled', function ()
                    {
                        k32.CancelIoEx(this._obj._output.Deref(), 0);

                        // Child process has exited
                        this.ds.push(null);

                        if (this._obj._process)
                        {
                            this._obj._process = null;
                            k32.ClosePseudoConsole(this._obj._h.Deref());
                        }
                       k32.CloseHandle(this._obj._input.Deref());
                       k32.CloseHandle(this._obj._output.Deref());

                       k32.CloseHandle(this._obj._consoleInput.Deref());
                       k32.CloseHandle(this._obj._consoleOutput.Deref());
                    });
                    ds.resizeTerminal = function (w, h)
                    {
                        console.setDestination(console.Destinations.LOGFILE);
                        console.log('resizeTerminal(' + w + ', ' + h + ')');
                        var hr;
                        if((hr=k32.ResizePseudoConsole(this._obj._h.Deref(),  (h << 16) | w).Val) != 0)
                        {
                            console.log('HResult=' + hr);
                            throw ('Resize returned HRESULT: ' + hr);
                        }
                        console.log('SUCCESS');
                    };

                    ds.terminal = ret;
                    ds._rpbuf = GM.CreateVariable(4096);
                    ds._rpbufRead = GM.CreateVariable(4);
                    ds.__read = function __read()
                    {
                        // Asyncronously read data from the pseudoconsole
                        this._rp = this.terminal.k32.ReadFile.async(this.terminal._output.Deref(), this._rpbuf, this._rpbuf._size, this._rpbufRead, 0);                      
                        this._rp.then(function ()
                        {
                            var len = this.parent._rpbufRead.toBuffer().readUInt32LE();
                            if (len <= 0) { return; }

                            this.parent.push(this.parent._rpbuf.toBuffer().slice(0, len));
                            this.parent.__read();
                        });
                        this._rp.parent = this;
                    };
                    ds.__read();
                    return (ds);
                }
                else
                {
                }
            }

        }
        throw ('Internal Error');
    }

    // This evaluates whether or not the powershell binary exists
    this.PowerShellCapable = function ()
    {
        if (require('os').arch() == 'x64')
        {
            return (require('fs').existsSync(process.env['windir'] + '\\SysWow64\\WindowsPowerShell\\v1.0\\powershell.exe'));
        }
        else
        {
            return (require('fs').existsSync(process.env['windir'] + '\\System32\\WindowsPowerShell\\v1.0\\powershell.exe'));
        }
    }

    // Start the PseudoConsole with the Command Prompt
    this.Start = function Start(CONSOLE_SCREEN_WIDTH, CONSOLE_SCREEN_HEIGHT)
    {
        return (this.Create(process.env['windir'] + '\\System32\\cmd.exe', CONSOLE_SCREEN_WIDTH, CONSOLE_SCREEN_HEIGHT));
    }

    // Start the PseduoConsole with PowerShell
    this.StartPowerShell = function StartPowerShell(CONSOLE_SCREEN_WIDTH, CONSOLE_SCREEN_HEIGHT)
    {
        if (require('os').arch() == 'x64')
        {
            if (require('fs').existsSync(process.env['windir'] + '\\System32\\WindowsPowerShell\\v1.0\\powershell.exe'))
            {
                return (this.Create(process.env['windir'] + '\\System32\\WindowsPowerShell\\v1.0\\powershell.exe', CONSOLE_SCREEN_WIDTH, CONSOLE_SCREEN_HEIGHT));
            }
            else
            {
                return (this.Create(process.env['windir'] + '\\SysWow64\\WindowsPowerShell\\v1.0\\powershell.exe', CONSOLE_SCREEN_WIDTH, CONSOLE_SCREEN_HEIGHT));
            }
        }
        else
        {
            return (this.Create(process.env['windir'] + '\\System32\\WindowsPowerShell\\v1.0\\powershell.exe', CONSOLE_SCREEN_WIDTH, CONSOLE_SCREEN_HEIGHT));
        }
    }
}

if (process.platform == 'win32')
{
    module.exports = new vt();
}