问题描述
我需要从当前登录的用户那里获取默认凭据，并将它们传递给我的Windows服务，以检查Internet连接并将文件上传到Dropbox。我不希望用户每次都确认自己的凭据。那么如何获得当前活动用户的代理设置+用户名+密码？
I need to get the default credentials from the current logged in user and pass them to my Windows service to check the internet connectivity and upload files to Dropbox. I don't want the user to confirm his/her credentials every time. So how is it possible to get the currently active user's proxy settings + username + password?
这是我的代码，用于检索当前用户
This is my Code to retrieve the current User
private static string UserName()
{
string userName = null;
ManagementScope ms = new ManagementScope();
ObjectQuery qry = new ObjectQuery("Select * from Win32_ComputerSystem");
ManagementObjectSearcher search = new ManagementObjectSearcher(ms, qry);
ManagementObjectCollection result = search.Get();
foreach (ManagementObject rec in result)
userName = rec["UserName"] as string;
string[] buffer = userName.Split('\\');
return buffer[1];
}
此代码用于获取WindowsIdentity：
and this Code is in use for getting the WindowsIdentity:
private static WindowsIdentity GetWindowsIdentity()
{
string userName = UserName();
PrincipalContext ctx = new PrincipalContext(ContextType.Domain);
using (UserPrincipal user = UserPrincipal.FindByIdentity(ctx, IdentityType.SamAccountName, userName) ??
UserPrincipal.FindByIdentity(UserPrincipal.Current.Context, IdentityType.UserPrincipalName, userName))
{
return user == null
? null
: new WindowsIdentity(user.UserPrincipalName);
}
}
这就是我要通过服务执行的操作：
This is what I want to do via service:
System.Diagnostics.Debugger.Launch(); //launch debugger when service runs
WindowsImpersonationContext impersonationContext;
impersonationContext = GetWindowsIdentity().Impersonate();
//try to use the currently logged in user's credentials
WebRequest.DefaultWebProxy.Credentials = CredentialCache.DefaultCredentials;
try
{
WebClient wClient = new WebClient();
string xx = wClient.DownloadString(@"https://dropbox.com");
if (xx == "") //just download the sourcecode to chek if this page is available
return false;
}
catch (Exception ex)
{
using (StreamWriter sw = new StreamWriter(@"C:\Users\Testuser\Desktop\DownloadError.txt", true))
{
sw.WriteLine(ex.ToString());
}
return false;
}
impersonationContext.Undo();
错误日志始终显示，该服务无法连接。当我从控制台或WinForms应用程序运行此程序时，它没有任何问题。
The errorLog always shows, that the service was unable to connect. When i run this from an console or WinForms applications, it works without any problems.
错误日志：
System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 172.217.17.238:80
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
at System.Net.WebClient.DownloadString(Uri address)
at System.Net.WebClient.DownloadString(String address)
at BeeShotService.Sender.TrySend(String s) in C:\Users\Testuser\Documents\Visual Studio 2017\Projects\Project_BackupUploder\UploaderService\Sender.cs:Zeile 70.
推荐答案
我已经设法解决了这个问题为简单带有附加类的webRequests：
I've managed to solve the problem for simple webRequests with an additional Class:
class GetProxySettings
{
private const int INTERNET_OPTION_PROXY = 38;
[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool InternetQueryOption(IntPtr hInternet, uint dwOption, IntPtr lpBuffer, ref int lpdwBufferLength);
/// <summary>
/// Access types supported by InternetOpen function.
/// </summary>
private enum InternetOpenType
{
INTERNET_OPEN_TYPE_PRECONFIG = 0,
INTERNET_OPEN_TYPE_DIRECT = 1,
INTERNET_OPEN_TYPE_PROXY = 3,
}
/// <summary>
/// Contains information that is supplied with the INTERNET_OPTION_PROXY value
/// to get or set proxy information on a handle obtained from a call to
/// the InternetOpen function.
/// </summary>
private struct INTERNET_PROXY_INFO
{
public InternetOpenType DwAccessType
{
get; set;
}
public string LpszProxy
{
get; set;
}
public string LpszProxyBypass
{
get; set;
}
}
internal string[] GetV(WindowsIdentity windowsIdentity)
{
string[] settings = new string[] { "", "" };
using (windowsIdentity.Impersonate())
{
int bufferLength = 0;
IntPtr buffer = IntPtr.Zero;
InternetQueryOption(IntPtr.Zero, INTERNET_OPTION_PROXY, IntPtr.Zero,
ref bufferLength);
try
{
buffer = Marshal.AllocHGlobal(bufferLength);
if (InternetQueryOption(IntPtr.Zero, INTERNET_OPTION_PROXY, buffer,
ref bufferLength))
{
INTERNET_PROXY_INFO proxyInfo = (INTERNET_PROXY_INFO)
// Converting structure to IntPtr.
Marshal.PtrToStructure(buffer, typeof(INTERNET_PROXY_INFO));
// Getting the proxy details.
settings[0] = proxyInfo.LpszProxy.Split(':')[0];
settings[1] = proxyInfo.LpszProxy.Split(':')[1];
}
}
catch { }
}
return settings;
}
}
您需要添加当前登录的WindowsIdentity并返回一个字符串[]，其中[0] = proxystring& [1] =代理端口。
以下服务可以很好地工作：
You need to add the WindowsIdentity of the currently logged-on user and will return a string[] with [0] = proxystring & [1] = proxy port.The following works well as a service:
WebClient wClient = new WebClient();
wClient.Proxy = new WebProxy( GetProxySettings.GetV(GetWindowsIdentity())[0],GetProxySettings.GetV(GetWindowsIdentity())[1]);
string xx = wClient.DownloadString(@"https://www.dropbox.com");
这篇关于如何将Webcredentials从活动用户传递到Windows Service？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！