PSSwaggerNetUtilities.Unsafe.Code.ps1

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// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT license.

// PSSwaggerUtility Module
namespace Microsoft.PowerShell.Commands.PSSwagger
{
    using Microsoft.Rest;
    using System;
    using System.Net.Http;
    using System.Net.Http.Headers;
    using System.Runtime.CompilerServices;
    using System.Runtime.InteropServices;
    using System.Security;
    using System.Text;
    using System.Threading;
    using System.Threading.Tasks;
    
    public class PSBasicAuthenticationEx : ServiceClientCredentials
    {
        public string UserName { get; set; }
        public SecureString Password { get; set; }
        public PSBasicAuthenticationEx(string userName, SecureString password)
        {
            this.UserName = userName;
            this.Password = password;
        }

        public override async Task ProcessHttpRequestAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            await Task.Run(() => ProcessHttpRequest(request), cancellationToken);
        }

        private void ProcessHttpRequest(HttpRequestMessage request)
        {
            int passwordLength = this.Password.Length;
            int userNameLength = this.UserName.Length;
            int totalCredsLength = passwordLength + userNameLength + 1;
            int base64size = Base64Encoder.PredictSize(totalCredsLength);
            byte[] userNameBytes = Encoding.UTF8.GetBytes(this.UserName);
            // This array ensures we clean up the string concatenation of "username:password"
            byte[] clientCredsArr = new byte[totalCredsLength];
            // And here we need to clean up the base64 encoded string
            // 3 bytes == 4 characters, + padding
            // totalCredsLength is the number of bytes we'll eventually encode char[] base64string = new char[base64size]; GCHandle byteHandle = new GCHandle(); GCHandle strHandle = new GCHandle(); // Ensure the insecure client cred string and the GC handle are cleaned up RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(delegate { // This block pins the insecure client cred string, converts the SecureString to the insecure password, frees the unpinned string, then generates the basic auth headers RuntimeHelpers.PrepareConstrainedRegions(); try { } finally { byteHandle = GCHandle.Alloc(clientCredsArr, GCHandleType.Pinned); strHandle = GCHandle.Alloc(base64string, GCHandleType.Pinned); } IntPtr pBstr = IntPtr.Zero; // Ensure bBstr is properly cleaned up RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(delegate { RuntimeHelpers.PrepareConstrainedRegions(); try { } finally { pBstr = Marshal.SecureStringToBSTR(this.Password); } unsafe { char* pTempPassword = (char*)pBstr; byte* pClientCreds = (byte*)byteHandle.AddrOfPinnedObject(); Encoding.UTF8.GetBytes(pTempPassword, passwordLength, pClientCreds + userNameLength + 1, passwordLength); for (int i = 0; i < userNameLength; i++) { pClientCreds[i] = userNameBytes[i]; } pClientCreds[userNameLength] = (byte)':'; Base64Encoder.Encode(clientCredsArr, base64string); } }, delegate { if (pBstr != IntPtr.Zero) { Marshal.ZeroFreeBSTR(pBstr); } }, null); // Not using BasicAuthenticationCredentials here because: 1) async, 2) need to have the handle to the pinned base64 encoded string // NOTE: URL safe encoding? request.Headers.Authorization = new AuthenticationHeaderValue("Basic", new string(base64string)); }, delegate { if (byteHandle.IsAllocated) { unsafe { byte* pClientCreds = (byte*)byteHandle.AddrOfPinnedObject(); for (int i = 0; i < totalCredsLength; i++) { pClientCreds[i] = 0; } byteHandle.Free(); char* pBase64String = (char*)strHandle.AddrOfPinnedObject(); for (int i = 0; i < base64size; i++) { pBase64String[i] = '\0'; } strHandle.Free(); } } }, null); } } public static class Base64Encoder { private const byte ls6mask = 0x3F; private const byte ls4mask = 0x0F; private const byte ls2mask = 0x03; private const byte ms6mask = 0xFC; private const byte ms4mask = 0xF0; private const byte ms2mask = 0xC0; private static char[] base64encoding = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' }; private static Func<byte?, byte?, byte>[] base64encoder = { (b1, b2) => { // MS6 of b2 return (byte)((b2 & ms6mask) >> 2); }, (b1, b2) => { // LS2 of b1 + MS4 of b2 return (byte)((byte)((b1 & ls2mask) << 4) | (byte)((b2 & ms4mask) >> 4)); }, (b1, b2) => { // LS4 of b1 + MS2 of b2 return (byte)((byte)((b1 & ls4mask) << 2) | (byte)((b2 & ms2mask) >> 6)); }, (b1, b2) => { // LS6 of b1 return (byte)(b1 & ls6mask); } }; public static void Encode(byte[] bytesToEncode, char[] charsToCopyOut) { int charOutIndex = 0; byte[] currentEncodingBuffer = new byte[2]; int indexToAddByte; if (BitConverter.IsLittleEndian) { currentEncodingBuffer[1] = 0; indexToAddByte = 0; } else { currentEncodingBuffer[0] = 0; indexToAddByte = 1; } int encodingActionIndex = 0; byte? lastByte = null; for (int i = 0; i < bytesToEncode.Length; i++) { if (charOutIndex >= charsToCopyOut.Length) { throw new Exception("Out char buffer is not big enough for base64 encoded string."); } charsToCopyOut[charOutIndex++] = GetChar(base64encoder[encodingActionIndex](lastByte, bytesToEncode[i]), currentEncodingBuffer, indexToAddByte); if (encodingActionIndex == bytesToEncode.Length - 1) { // Last step resets the next lastByte to null lastByte = null; } else { lastByte = bytesToEncode[i]; } encodingActionIndex = (encodingActionIndex + 1) % base64encoder.Length; // If the next action is the last one, run it now and reset lastByte if (encodingActionIndex == base64encoder.Length - 1) { if (charOutIndex >= charsToCopyOut.Length) { throw new Exception("Out char buffer is not big enough for base64 encoded string."); } charsToCopyOut[charOutIndex++] = GetChar(base64encoder[encodingActionIndex](bytesToEncode[i], null), currentEncodingBuffer, indexToAddByte); encodingActionIndex = (encodingActionIndex + 1) % base64encoder.Length; lastByte = null; } else { lastByte = bytesToEncode[i]; } } // One more phase to run on the last byte if (encodingActionIndex != 0) { if (charOutIndex >= charsToCopyOut.Length) { throw new Exception("Out char buffer is not big enough for base64 encoded string."); } charsToCopyOut[charOutIndex++] = GetChar(base64encoder[encodingActionIndex](lastByte, 0), currentEncodingBuffer, indexToAddByte); } int charsLeft = charOutIndex % 4; if (charsLeft != 0) { int padding = 4 - charsLeft; while (padding-- > 0) { charsToCopyOut[charOutIndex++] = '='; } } } public static int PredictSize(int numberOfBytes) { return (int)(4 * Math.Ceiling((double)numberOfBytes / 3)); } private static char GetChar(byte b, byte[] buffer, int index) { buffer[index] = b; return base64encoding[BitConverter.ToInt16(buffer, 0)]; } } } # SIG # Begin signature block # MIIarQYJKoZIhvcNAQcCoIIanjCCGpoCAQExCzAJBgUrDgMCGgUAMGkGCisGAQQB # gjcCAQSgWzBZMDQGCisGAQQBgjcCAR4wJgIDAQAABBAfzDtgWUsITrck0sYpfvNR # AgEAAgEAAgEAAgEAAgEAMCEwCQYFKw4DAhoFAAQUZKvdLkkcQHVwIz7Pg2YS4EZd # J9agghWAMIIEwjCCA6qgAwIBAgITMwAAALu2dyRxSiAAIAAAAAAAuzANBgkqhkiG # 9w0BAQUFADB3MQswCQYDVQQGEwJVUzETMBEGA1UECBMKV2FzaGluZ3RvbjEQMA4G # A1UEBxMHUmVkbW9uZDEeMBwGA1UEChMVTWljcm9zb2Z0IENvcnBvcmF0aW9uMSEw # HwYDVQQDExhNaWNyb3NvZnQgVGltZS1TdGFtcCBQQ0EwHhcNMTYwOTA3MTc1ODQ3 # WhcNMTgwOTA3MTc1ODQ3WjCBsjELMAkGA1UEBhMCVVMxEzARBgNVBAgTCldhc2hp # bmd0b24xEDAOBgNVBAcTB1JlZG1vbmQxHjAcBgNVBAoTFU1pY3Jvc29mdCBDb3Jw # b3JhdGlvbjEMMAoGA1UECxMDQU9DMScwJQYDVQQLEx5uQ2lwaGVyIERTRSBFU046 # 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