我正在尝试使用对该服务器没有权限的域帐户访问服务器的C $.我需要以该服务器的本地登录的形式保存凭据,以使程序正常工作.
如何使用CredWrite保存这些凭据
我发现Credential Manager类:(编辑：以下是正常运行的代码.)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
namespace Test_Manager
{
public class Win32CredMan
{
[DllImport("Advapi32.dll", EntryPoint = "CredReadW", CharSet = CharSet.Unicode, SetLastError = true)]
static extern bool CredRead(string target, CRED_TYPE type, int reservedFlag, out IntPtr CredentialPtr);
[DllImport("Advapi32.dll", EntryPoint = "CredWriteW", CharSet = CharSet.Unicode, SetLastError = true)]
static extern bool CredWrite([In] ref NativeCredential userCredential, [In] UInt32 flags);
[DllImport("Advapi32.dll", EntryPoint = "CredFree", SetLastError = true)]
static extern bool CredFree([In] IntPtr cred);
public enum CRED_TYPE : uint
{
GENERIC = 1,
DOMAIN_PASSWORD = 2,
DOMAIN_CERTIFICATE = 3,
DOMAIN_VISIBLE_PASSWORD = 4,
GENERIC_CERTIFICATE = 5,
DOMAIN_EXTENDED = 6,
MAXIMUM = 7, // Maximum supported cred type
MAXIMUM_EX = (MAXIMUM + 1000), // Allow new applications to run on old OSes
}
public enum CRED_PERSIST : uint
{
SESSION = 1,
LOCAL_MACHINE = 2,
ENTERPRISE = 3,
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
private struct NativeCredential
{
public UInt32 Flags;
public CRED_TYPE Type;
public IntPtr TargetName;
public IntPtr Comment;
public System.Runtime.InteropServices.ComTypes.FILETIME LastWritten;
public UInt32 CredentialBlobSize;
public IntPtr CredentialBlob;
public UInt32 Persist;
public UInt32 AttributeCount;
public IntPtr Attributes;
public IntPtr TargetAlias;
public IntPtr UserName;
/// <summary>
/// This method derives a NativeCredential instance from a given Credential instance.
/// </summary>
/// <param name="cred">The managed Credential counterpart containing data to be stored.</param>
/// <returns>A NativeCredential instance that is derived from the given Credential
/// instance.</returns>
internal static NativeCredential GetNativeCredential(Credential cred)
{
NativeCredential ncred = new NativeCredential();
ncred.AttributeCount = 0;
ncred.Attributes = IntPtr.Zero;
ncred.Comment = IntPtr.Zero;
ncred.TargetAlias = IntPtr.Zero;
ncred.Type = (CRED_TYPE)cred.Type;
ncred.Persist = (UInt32)cred.Persist;
ncred.CredentialBlobSize = (UInt32)cred.CredentialBlobSize;
ncred.TargetName = Marshal.StringToCoTaskMemUni(cred.TargetName);
ncred.CredentialBlob = Marshal.StringToCoTaskMemUni(cred.CredentialBlob);
ncred.UserName = Marshal.StringToCoTaskMemUni(cred.UserName);
return ncred;
}
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
private struct Credential
{
public UInt32 Flags;
public CRED_TYPE Type;
public string TargetName;
public string Comment;
public System.Runtime.InteropServices.ComTypes.FILETIME LastWritten;
public UInt32 CredentialBlobSize;
public string CredentialBlob;
public CRED_PERSIST Persist;
public UInt32 AttributeCount;
public IntPtr Attributes;
public string TargetAlias;
public string UserName;
}
#region Critical Handle Type definition
sealed class CriticalCredentialHandle : CriticalHandleZeroOrMinusOneIsInvalid
{
// Set the handle.
internal CriticalCredentialHandle(IntPtr preexistingHandle)
{
SetHandle(preexistingHandle);
}
internal Credential GetCredential()
{
if (!IsInvalid)
{
// Get the Credential from the mem location
NativeCredential ncred = (NativeCredential)Marshal.PtrToStructure(handle,
typeof(NativeCredential));
// Create a managed Credential type and fill it with data from the native counterpart.
Credential cred = new Credential();
cred.CredentialBlobSize = ncred.CredentialBlobSize;
cred.CredentialBlob = Marshal.PtrToStringUni(ncred.CredentialBlob,
(int)ncred.CredentialBlobSize / 2);
cred.UserName = Marshal.PtrToStringUni(ncred.UserName);
cred.TargetName = Marshal.PtrToStringUni(ncred.TargetName);
cred.TargetAlias = Marshal.PtrToStringUni(ncred.TargetAlias);
cred.Type = ncred.Type;
cred.Flags = ncred.Flags;
cred.Persist = (CRED_PERSIST)ncred.Persist;
return cred;
}
else
{
throw new InvalidOperationException("Invalid CriticalHandle!");
}
}
// Perform any specific actions to release the handle in the ReleaseHandle method.
// Often, you need to use Pinvoke to make a call into the Win32 API to release the
// handle. In this case, however, we can use the Marshal class to release the unmanaged memory.
override protected bool ReleaseHandle()
{
// If the handle was set, free it. Return success.
if (!IsInvalid)
{
// NOTE: We should also ZERO out the memory allocated to the handle, before free'ing it
// so there are no traces of the sensitive data left in memory.
CredFree(handle);
// Mark the handle as invalid for future users.
SetHandleAsInvalid();
return true;
}
// Return false.
return false;
}
}
#endregion
public int WriteCred(string key, string user, string secret)
{
// Validations.
byte[] byteArray = Encoding.Unicode.GetBytes(secret);
if (byteArray.Length > 512)
throw new ArgumentOutOfRangeException("The secret message has exceeded 512 bytes.");
// Go ahead with what we have are stuff it into the CredMan structures.
Credential cred = new Credential();
cred.TargetName = key;
cred.UserName = user;
cred.CredentialBlob = secret;
cred.CredentialBlobSize = (UInt32)Encoding.Unicode.GetBytes(secret).Length;
cred.AttributeCount = 0;
cred.Attributes = IntPtr.Zero;
cred.Comment = null;
cred.TargetAlias = null;
cred.Type = CRED_TYPE.DOMAIN_PASSWORD;
cred.Persist = CRED_PERSIST.ENTERPRISE;
NativeCredential ncred = NativeCredential.GetNativeCredential(cred);
// Write the info into the CredMan storage.
bool written = CredWrite(ref ncred, 0);
int lastError = Marshal.GetLastWin32Error();
if (written)
{
return 0;
}
else
{
string message = string.Format("CredWrite failed with the error code {0}.", lastError);
throw new Exception(message);
}
}
public static string ReadCred(string key)
{
// Validations.
IntPtr nCredPtr;
string readPasswordText = null;
// Make the API call using the P/Invoke signature
bool read = CredRead(key, CRED_TYPE.GENERIC, 0, out nCredPtr);
int lastError = Marshal.GetLastWin32Error();
// If the API was successful then...
if (read)
{
using (CriticalCredentialHandle critCred = new CriticalCredentialHandle(nCredPtr))
{
Credential cred = critCred.GetCredential();
readPasswordText = cred.CredentialBlob;
}
}
else
{
readPasswordText = string.Empty;
//1168 is "element not found" -- ignore that one and return empty string:
if (lastError != 1168)
{
string message = string.Format("ReadCred failed with the error code {0}.", lastError);
throw new Exception(message);
}
}
return readPasswordText;
}
}
}
长话短说这是我正在尝试使用的上述代码中的方法：
public int WriteCred(string key, string user, string secret)
{
// Validations.
byte[] byteArray = Encoding.Unicode.GetBytes(secret);
if (byteArray.Length > 512)
throw new ArgumentOutOfRangeException("The secret message has exceeded 512 bytes.");
// Go ahead with what we have are stuff it into the CredMan structures.
Credential cred = new Credential();
cred.TargetName = key;
cred.UserName = user;
cred.CredentialBlob = secret;
cred.CredentialBlobSize = (UInt32)Encoding.Unicode.GetBytes(secret).Length;
cred.AttributeCount = 0;
cred.Attributes = IntPtr.Zero;
cred.Comment = null;
cred.TargetAlias = null;
cred.Type = CRED_TYPE.DOMAIN_PASSWORD;
cred.Persist = CRED_PERSIST.ENTERPRISE;
NativeCredential ncred = NativeCredential.GetNativeCredential(cred);
// Write the info into the CredMan storage.
bool written = CredWrite(ref ncred, 0);
int lastError = Marshal.GetLastWin32Error();
if (written)
{
return 0;
}
else
{
string message = string.Format("CredWrite failed with the error code {0}.", lastError);
throw new Exception(message);
}
}
这就是我在程序正文中所做的：
Win32CredMan cm = new Win32CredMan();
cm.WriteCred("TheServer-18", @"TheServer-18\Administrator", "P4SSw0rD!");
我假设我没有获得访问权限,因为没有正确添加凭据.
更新：
我已经介绍的过程是向Windows Credential Manager添加Generic Credential.但是,如果不使用WriteCred方法中指定的用户名.我不明白为什么.
解决方法:
问题得到解决,上面的代码现在完全正常运行.
问题与GetNativeCredential有关,它没有使用在WriteCred方法中分配给cred的值,而是使用已设置的一些静态值.
此外,我将信息输入WriteCred方法的方式不正确.上面的代码已经修复,以便它完全正常运行.