远程桌面rdp文件加密密码串的生成（C#）
想用程序生成一个rdp文件，双击就可以自动登录到远程桌面。Google半天关键点密码串生成不知道如何解决。
网上搜了知道需要用到crypt32.dll的CryptProtectData函数来进行加密，于是找到一段现成的代码，DPAPI：
///////////////////////////////////////////////////////////////////////////////
// SAMPLE: Encryption and decryption using DPAPI functions.
//
// To run this sample, create a new Visual C# project using the Console
// Application template and replace the contents of the Class1.cs file
// with the code below.
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
// PURPOSE.
//
// Copyright (C) 2003. Obviex(TM). All rights reserved.
//
using System;
using System.Text;
using System.Runtime.InteropServices;
using System.ComponentModel;
namespace Crypt32
{
/// <summary>
/// Encrypts and decrypts data using DPAPI functions.
/// </summary>
public class DPAPI
{
// Wrapper for DPAPI CryptProtectData function.
[DllImport("crypt32.dll",
SetLastError = true,
CharSet = System.Runtime.InteropServices.CharSet.Auto)]
private static extern
bool CryptProtectData(ref DATA_BLOB pPlainText,
string szDescription,
ref DATA_BLOB pEntropy,
IntPtr pReserved,
ref CRYPTPROTECT_PROMPTSTRUCT pPrompt,
int dwFlags,
ref DATA_BLOB pCipherText);
// Wrapper for DPAPI CryptUnprotectData function.
[DllImport("crypt32.dll",
SetLastError = true,
CharSet = System.Runtime.InteropServices.CharSet.Auto)]
private static extern
bool CryptUnprotectData(ref DATA_BLOB pCipherText,
ref string pszDescription,
ref DATA_BLOB pEntropy,
IntPtr pReserved,
ref CRYPTPROTECT_PROMPTSTRUCT pPrompt,
int dwFlags,
ref DATA_BLOB pPlainText);
// BLOB structure used to pass data to DPAPI functions.
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal struct DATA_BLOB
{
public int cbData;
public IntPtr pbData;
}
// Prompt structure to be used for required parameters.
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal struct CRYPTPROTECT_PROMPTSTRUCT
{
public int cbSize;
public int dwPromptFlags;
public IntPtr hwndApp;
public string szPrompt;
}
// Wrapper for the NULL handle or pointer.
static private IntPtr NullPtr = ((IntPtr)((int)(0)));
// DPAPI key initialization flags.
private const int CRYPTPROTECT_UI_FORBIDDEN = 0x1;
private const int CRYPTPROTECT_LOCAL_MACHINE = 0x4;
/// <summary>
/// Initializes empty prompt structure.
/// </summary>
/// <param name="ps">
/// Prompt parameter (which we do not actually need).
/// </param>
private static void InitPrompt(ref CRYPTPROTECT_PROMPTSTRUCT ps)
{
ps.cbSize = Marshal.SizeOf(
typeof(CRYPTPROTECT_PROMPTSTRUCT));
ps.dwPromptFlags = 0;
ps.hwndApp = NullPtr;
ps.szPrompt = null;
}
/// <summary>
/// Initializes a BLOB structure from a byte array.
/// </summary>
/// <param name="data">
/// Original data in a byte array format.
/// </param>
/// <param name="blob">
/// Returned blob structure.
/// </param>
private static void InitBLOB(byte[] data, ref DATA_BLOB blob)
{
// Allocate memory for the BLOB data.
blob.pbData = Marshal.AllocHGlobal(data.Length);
// Make sure that memory allocation was successful.
if (blob.pbData == IntPtr.Zero)
throw new Exception(
"Unable to allocate data buffer for BLOB structure.");
// Specify number of bytes in the BLOB.
blob.cbData = data.Length;
// Copy data from original source to the BLOB structure.
Marshal.Copy(data, 0, blob.pbData, data.Length);
}
// Flag indicating the type of key. DPAPI terminology refers to
// key types as user store or machine store.
public enum KeyType { UserKey = 1, MachineKey };
// It is reasonable to set default key type to user key.
private static KeyType defaultKeyType = KeyType.UserKey;
/// <summary>
/// Calls DPAPI CryptProtectData function to encrypt a plaintext
/// string value with a user-specific key. This function does not
/// specify data description and additional entropy.
/// </summary>
/// <param name="plainText">
/// Plaintext data to be encrypted.
/// </param>
/// <returns>
/// Encrypted value in a base64-encoded format.
/// </returns>
public static string Encrypt(string plainText)
{
return Encrypt(defaultKeyType, plainText, String.Empty,
String.Empty);
}
/// <summary>
/// Calls DPAPI CryptProtectData function to encrypt a plaintext
/// string value. This function does not specify data description
/// and additional entropy.
/// </summary>
/// <param name="keyType">
/// Defines type of encryption key to use. When user key is
/// specified, any application running under the same user account
/// as the one making this call, will be able to decrypt data.
/// Machine key will allow any application running on the same
/// computer where data were encrypted to perform decryption.
/// Note: If optional entropy is specifed, it will be required
/// for decryption.
/// </param>
/// <param name="plainText">
/// Plaintext data to be encrypted.
/// </param>
/// <returns>
/// Encrypted value in a base64-encoded format.
/// </returns>
public static string Encrypt(KeyType keyType, string plainText)
{
return Encrypt(keyType, plainText, String.Empty,
String.Empty);
}
/// <summary>
/// Calls DPAPI CryptProtectData function to encrypt a plaintext
/// string value. This function does not specify data description.
/// </summary>
/// <param name="keyType">
/// Defines type of encryption key to use. When user key is
/// specified, any application running under the same user account
/// as the one making this call, will be able to decrypt data.
/// Machine key will allow any application running on the same
/// computer where data were encrypted to perform decryption.
/// Note: If optional entropy is specifed, it will be required
/// for decryption.
/// </param>
/// <param name="plainText">
/// Plaintext data to be encrypted.
/// </param>
/// <param name="entropy">
/// Optional entropy which - if specified - will be required to
/// perform decryption.
/// </param>
/// <returns>
/// Encrypted value in a base64-encoded format.
/// </returns>
public static string Encrypt(KeyType keyType,
string plainText,
string entropy)
{
return Encrypt(keyType, plainText, entropy, String.Empty);
}
/// <summary>
/// Calls DPAPI CryptProtectData function to encrypt a plaintext
/// string value.
/// </summary>
/// <param name="keyType">
/// Defines type of encryption key to use. When user key is
/// specified, any application running under the same user account
/// as the one making this call, will be able to decrypt data.
/// Machine key will allow any application running on the same
/// computer where data were encrypted to perform decryption.
/// Note: If optional entropy is specifed, it will be required
/// for decryption.
/// </param>
/// <param name="plainText">
/// Plaintext data to be encrypted.
/// </param>
/// <param name="entropy">
/// Optional entropy which - if specified - will be required to
/// perform decryption.
/// </param>
/// <param name="description">
/// Optional description of data to be encrypted. If this value is
/// specified, it will be stored along with encrypted data and
/// returned as a separate value during decryption.
/// </param>
/// <returns>
/// Encrypted value in a base64-encoded format.
/// </returns>
public static string Encrypt(KeyType keyType,
string plainText,
string entropy,
string description)
{
// Make sure that parameters are valid.
if (plainText == null) plainText = String.Empty;
if (entropy == null) entropy = String.Empty;
// Call encryption routine and convert returned bytes into
// a base64-encoded value.
//return Convert.ToBase64String(
return BitConverter.ToString(
Encrypt(keyType,
Encoding.UTF8.GetBytes(plainText),
Encoding.UTF8.GetBytes(entropy),
description));
}
/// <summary>
/// Calls DPAPI CryptProtectData function to encrypt an array of
/// plaintext bytes.
/// </summary>
/// <param name="keyType">
/// Defines type of encryption key to use. When user key is
/// specified, any application running under the same user account
/// as the one making this call, will be able to decrypt data.
/// Machine key will allow any application running on the same
/// computer where data were encrypted to perform decryption.
/// Note: If optional entropy is specifed, it will be required
/// for decryption.
/// </param>
/// <param name="plainTextBytes">
/// Plaintext data to be encrypted.
/// </param>
/// <param name="entropyBytes">
/// Optional entropy which - if specified - will be required to
/// perform decryption.
/// </param>
/// <param name="description">
/// Optional description of data to be encrypted. If this value is
/// specified, it will be stored along with encrypted data and
/// returned as a separate value during decryption.
/// </param>
/// <returns>
/// Encrypted value.
/// </returns>
public static byte[] Encrypt(KeyType keyType,
byte[] plainTextBytes,
byte[] entropyBytes,
string description)
{
// Make sure that parameters are valid.
if (plainTextBytes == null) plainTextBytes = new byte[0];
if (entropyBytes == null) entropyBytes = new byte[0];
if (description == null) description = String.Empty;
// Create BLOBs to hold data.
DATA_BLOB plainTextBlob = new DATA_BLOB();
DATA_BLOB cipherTextBlob = new DATA_BLOB();
DATA_BLOB entropyBlob = new DATA_BLOB();
// We only need prompt structure because it is a required
// parameter.
CRYPTPROTECT_PROMPTSTRUCT prompt =
new CRYPTPROTECT_PROMPTSTRUCT();
InitPrompt(ref prompt);
try
{
// Convert plaintext bytes into a BLOB structure.
try
{
InitBLOB(plainTextBytes, ref plainTextBlob);
}
catch (Exception ex)
{
throw new Exception(
"Cannot initialize plaintext BLOB.", ex);
}
// Convert entropy bytes into a BLOB structure.
try
{
InitBLOB(entropyBytes, ref entropyBlob);
}
catch (Exception ex)
{
throw new Exception(
"Cannot initialize entropy BLOB.", ex);
}
// Disable any types of UI.
int flags = CRYPTPROTECT_UI_FORBIDDEN;
// When using machine-specific key, set up machine flag.
if (keyType == KeyType.MachineKey)
flags |= CRYPTPROTECT_LOCAL_MACHINE;
// Call DPAPI to encrypt data.
bool success = CryptProtectData(ref plainTextBlob,
description,
ref entropyBlob,
IntPtr.Zero,
ref prompt,
flags,
ref cipherTextBlob);
// Check the result.
if (!success)
{
// If operation failed, retrieve last Win32 error.
int errCode = Marshal.GetLastWin32Error();
// Win32Exception will contain error message corresponding
// to the Windows error code.
throw new Exception(
"CryptProtectData failed.", new Win32Exception(errCode));
}
// Allocate memory to hold ciphertext.
byte[] cipherTextBytes = new byte[cipherTextBlob.cbData];
// Copy ciphertext from the BLOB to a byte array.
Marshal.Copy(cipherTextBlob.pbData,
cipherTextBytes,
0,
cipherTextBlob.cbData);
// Return the result.
return cipherTextBytes;
}
catch (Exception ex)
{
throw new Exception("DPAPI was unable to encrypt data.", ex);
}
// Free all memory allocated for BLOBs.
finally
{
if (plainTextBlob.pbData != IntPtr.Zero)
Marshal.FreeHGlobal(plainTextBlob.pbData);
if (cipherTextBlob.pbData != IntPtr.Zero)
Marshal.FreeHGlobal(cipherTextBlob.pbData);
if (entropyBlob.pbData != IntPtr.Zero)
Marshal.FreeHGlobal(entropyBlob.pbData);
}
}
/// <summary>
/// Calls DPAPI CryptUnprotectData to decrypt ciphertext bytes.
/// This function does not use additional entropy and does not
/// return data description.
/// </summary>
/// <param name="cipherText">
/// Encrypted data formatted as a base64-encoded string.
/// </param>
/// <returns>
/// Decrypted data returned as a UTF-8 string.
/// </returns>
/// <remarks>
/// When decrypting data, it is not necessary to specify which
/// type of encryption key to use: user-specific or
/// machine-specific; DPAPI will figure it out by looking at
/// the signature of encrypted data.
/// </remarks>
public static string Decrypt(string cipherText)
{
string description;
return Decrypt(cipherText, String.Empty, out description);
}
/// <summary>
/// Calls DPAPI CryptUnprotectData to decrypt ciphertext bytes.
/// This function does not use additional entropy.
/// </summary>
/// <param name="cipherText">
/// Encrypted data formatted as a base64-encoded string.
/// </param>
/// <param name="description">
/// Returned description of data specified during encryption.
/// </param>
/// <returns>
/// Decrypted data returned as a UTF-8 string.
/// </returns>
/// <remarks>
/// When decrypting data, it is not necessary to specify which
/// type of encryption key to use: user-specific or
/// machine-specific; DPAPI will figure it out by looking at
/// the signature of encrypted data.
/// </remarks>
public static string Decrypt(string cipherText,
out string description)
{
return Decrypt(cipherText, String.Empty, out description);
}
/// <summary>
/// Calls DPAPI CryptUnprotectData to decrypt ciphertext bytes.
/// </summary>
/// <param name="cipherText">
/// Encrypted data formatted as a base64-encoded string.
/// </param>
/// <param name="entropy">
/// Optional entropy, which is required if it was specified during
/// encryption.
/// </param>
/// <param name="description">
/// Returned description of data specified during encryption.
/// </param>
/// <returns>
/// Decrypted data returned as a UTF-8 string.
/// </returns>
/// <remarks>
/// When decrypting data, it is not necessary to specify which
/// type of encryption key to use: user-specific or
/// machine-specific; DPAPI will figure it out by looking at
/// the signature of encrypted data.
/// </remarks>
public static string Decrypt(string cipherText,
string entropy,
out string description)
{
// Make sure that parameters are valid.
if (entropy == null) entropy = String.Empty;
return Encoding.UTF8.GetString(
Decrypt(Convert.FromBase64String(cipherText),
Encoding.UTF8.GetBytes(entropy),
out description));
}
/// <summary>
/// Calls DPAPI CryptUnprotectData to decrypt ciphertext bytes.
/// </summary>
/// <param name="cipherTextBytes">
/// Encrypted data.
/// </param>
/// <param name="entropyBytes">
/// Optional entropy, which is required if it was specified during
/// encryption.
/// </param>
/// <param name="description">
/// Returned description of data specified during encryption.
/// </param>
/// <returns>
/// Decrypted data bytes.
/// </returns>
/// <remarks>
/// When decrypting data, it is not necessary to specify which
/// type of encryption key to use: user-specific or
/// machine-specific; DPAPI will figure it out by looking at
/// the signature of encrypted data.
/// </remarks>
public static byte[] Decrypt(byte[] cipherTextBytes,
byte[] entropyBytes,
out string description)
{
// Create BLOBs to hold data.
DATA_BLOB plainTextBlob = new DATA_BLOB();
DATA_BLOB cipherTextBlob = new DATA_BLOB();
DATA_BLOB entropyBlob = new DATA_BLOB();
// We only need prompt structure because it is a required
// parameter.
CRYPTPROTECT_PROMPTSTRUCT prompt =
new CRYPTPROTECT_PROMPTSTRUCT();
InitPrompt(ref prompt);
// Initialize description string.
description = String.Empty;
try
{
// Convert ciphertext bytes into a BLOB structure.
try
{
InitBLOB(cipherTextBytes, ref cipherTextBlob);
}
catch (Exception ex)
{
throw new Exception(
"Cannot initialize ciphertext BLOB.", ex);
}
// Convert entropy bytes into a BLOB structure.
try
{
InitBLOB(entropyBytes, ref entropyBlob);
}
catch (Exception ex)
{
throw new Exception(
"Cannot initialize entropy BLOB.", ex);
}
// Disable any types of UI. CryptUnprotectData does not
// mention CRYPTPROTECT_LOCAL_MACHINE flag in the list of
// supported flags so we will not set it up.
int flags = CRYPTPROTECT_UI_FORBIDDEN;
// Call DPAPI to decrypt data.
bool success = CryptUnprotectData(ref cipherTextBlob,
ref description,
ref entropyBlob,
IntPtr.Zero,
ref prompt,
flags,
ref plainTextBlob);
// Check the result.
if (!success)
{
// If operation failed, retrieve last Win32 error.
int errCode = Marshal.GetLastWin32Error();
// Win32Exception will contain error message corresponding
// to the Windows error code.
throw new Exception(
"CryptUnprotectData failed.", new Win32Exception(errCode));
}
// Allocate memory to hold plaintext.
byte[] plainTextBytes = new byte[plainTextBlob.cbData];
// Copy ciphertext from the BLOB to a byte array.
Marshal.Copy(plainTextBlob.pbData,
plainTextBytes,
0,
plainTextBlob.cbData);
// Return the result.
return plainTextBytes;
}
catch (Exception ex)
{
throw new Exception("DPAPI was unable to decrypt data.", ex);
}
// Free all memory allocated for BLOBs.
finally
{
if (plainTextBlob.pbData != IntPtr.Zero)
Marshal.FreeHGlobal(plainTextBlob.pbData);
if (cipherTextBlob.pbData != IntPtr.Zero)
Marshal.FreeHGlobal(cipherTextBlob.pbData);
if (entropyBlob.pbData != IntPtr.Zero)
Marshal.FreeHGlobal(entropyBlob.pbData);
}
}
}
/// <summary>
/// Demonstrates the use of DPAPI functions to encrypt and decrypt data.
/// </summary>
//public class DPAPITest
//{
// /// <summary>
// /// The main entry point for the application.
// /// </summary>
// [STAThread]
// static void Main(string[] args)
// {
// try
// {
// string text = "Hello, world!";
// string entropy = null;
// string description;
// Console.WriteLine("Plaintext: {0}\r\n", text);
// // Call DPAPI to encrypt data with user-specific key.
// string encrypted = DPAPI.Encrypt(DPAPI.KeyType.UserKey,
// text,
// entropy,
// "My Data");
// Console.WriteLine("Encrypted: {0}\r\n", encrypted);
// // Call DPAPI to decrypt data.
// string decrypted = DPAPI.Decrypt(encrypted,
// entropy,
// out description);
// Console.WriteLine("Decrypted: {0} <<<{1}>>>\r\n",
// decrypted, description);
// }
// catch (Exception ex)
// {
// while (ex != null)
// {
// Console.WriteLine(ex.Message);
// ex = ex.InnerException;
// }
// }
// }
//}
}
//
// END OF FILE
///////////////////////////////////////////////////////////////////////////////
但调用上述代码中CryptProtectData方法创建的密码串尝试过之后，发现不行，密码不正确，有个细节我记下了，本来我的密码设置的是6位，但自动登录的时候只显示了3个*号，这样密码肯定是不正确的。
于是从CSDN上搜到一个程序可以生成密码串，试了一下，确实可以。仔细研究发现用上述代码生成的密码串长度比用这个程序生成的要短，研究了一下这个程序，
程序是Delphi编写的，通过程序属性找到了主页：http://remkoweijnen.nl/blog/2007/10/18/how-rdp-passwords-are-encrypted/
其中最主要的提示我找到了：RDP uses UniCode。（RDP使用Unicode格式），于是猜想是否是上述代码中没有进行格式转换，于是找到代码中关键的方法：
InitBLOB()。原来的代码：
private static void InitBLOB(byte[] data, ref DATA_BLOB blob)
{
// Allocate memory for the BLOB data.
blob.pbData = Marshal.AllocHGlobal(data.Length);
// Make sure that memory allocation was successful.
if (blob.pbData == IntPtr.Zero)
throw new Exception(
"Unable to allocate data buffer for BLOB structure.");
// Specify number of bytes in the BLOB.
blob.cbData = data.Length;
// Copy data from original source to the BLOB structure.
Marshal.Copy(data, 0, blob.pbData, data.Length);
}
修改为：
private static void InitBLOB(byte[] data, ref DATA_BLOB blob)
{
//Modified By Mrch1.Need to convert the data to Unicode.
byte[] tmp = System.Text.Encoding.Convert(System.Text.Encoding.ASCII, System.Text.Encoding.Unicode, data);
// Allocate memory for the BLOB data.
blob.pbData = Marshal.AllocHGlobal(tmp.Length);
// Make sure that memory allocation was successful.
if (blob.pbData == IntPtr.Zero)
throw new Exception(
"Unable to allocate data buffer for BLOB structure.");
// Specify number of bytes in the BLOB.
blob.cbData = tmp.Length;
// Copy data from original source to the BLOB structure.
Marshal.Copy(tmp, 0, blob.pbData, tmp.Length);
}
这下使用这个方法创建的密码串生成的rdp文件就可以被正确的识别出密码来了。
附：关键rdp文件项解释：
screen mode id:i:1 desktopwidth:i:1280 desktopheight:i:750 session bpp:i:24 winposstr:s:2,3,188,8,1062,721 full address:s:MyServer //服务器地址 一般填IP地址 compression:i:1 keyboardhook:i:2 audiomode:i:0 redirectdrives:i:0 redirectprinters:i:0 redirectcomports:i:0 redirectsmartcards:i:0 displayconnectionbar:i:1 autoreconnection enabled:i:1 username:s:MyUserName //用户名 domain:s:MyDomain //域名 可以不填。 alternate shell:s: shell working directory:s: password 51:b:01000000D08C9DDF0115D1118C7A00C04FC297EB0100000052A9E191EA75A948B359790578C9371A0000000008000000700073007700000003660000A8000000100000000A1DCCD2E50775CA25EC3857164B34DC0000000004800000A000000010000000FCE1A645B9B61AA450946BB6F955058108020000D83591CA47562D6DDAA689F050AE145039EBE22E00D1D3AEAA98373C7B63C3E8E7149072DF989EA43EFCE20513AD3D27B11BE7F17066A688E1DCE828AF85460AAC327B38E90776DB962888E4393D19637578984B19A187AAD95F6D2726ADE7DD315FF56C15FF5B3031014EDDCC3C24D1B81779AFDB006EE575F5BEFB8D2D2138D9D9D642BBB251CC5ED7226968764856EC660A646BACE748A13D6002A9A537AA70710615650B9387EED66DE28BD57B304BBDD7B581B943DA628EB0289E30A8BA784B76F7885BECCAB4FEF7820E97EE3C6E036EEAF6EAA669288DF2FCACC9BEC045C907EBBDE87AFB8CC6B07A600BD63AC891B61D95C2265DD9FD5E635D61BFBF5EDC28311375066611C610FB533D64515B643C82F57D9B183B05C156D91BC0974D38E546022B139E82452E6F1EDF76E52F732C3904E5E433F8F3D488DB0698427DBB0791A9F207F8CB6654CB8410BAF4A59C4F9E821E589ABC1E6E6E1D432181B690408F6884FE1007895A4D26D4A5A2C7458EE747DA35D44AC9FB08AB5477EA3E7CCDB3E37EE20FAFD0D0CF9584E420598B7003B347943AC28048F45E0FD21AD08148FFADCE0E7877219259A7BE722FFAE845A429BA2CF0A71F2D19EA7495530FABDB5106E8D404A38A7E6394C38457640EA7398C5D55F0C4D342CC6A39C77E10A2A5145AEA40B14F5C7C3760334D83C9BE748383FADE231248537353817D51F7B44F61B406ABC61400000071C354139F458B02D978015F785B97F7F6B307380 //这么一长串就是密码了，“password 51:b:”后面改为你自己生成的密码串 disable wallpaper:i:1 disable full window drag:i:1 disable menu anims:i:1 disable themes:i:0 disable cursor setting:i:0 bitmapcachepersistenable:i:1
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