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Thread: How to access a LINUX SMB share to create a simple text file

  1. #1

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    MS SQL Powerposter szlamany's Avatar
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    How to access a LINUX SMB share to create a simple text file

    Looking for someone with experience accessing a LINUX SMB share from .Net.

    I was hoping to open a text file and write to it.

    Someone gave me a POWERSHELL script showing how they map a drive to that share username and password being set.

    Code:
    New-PSDRIVE -NAME "I" -PSProvider FileSystem -Root \\xxx.xxx.xxx.xxx\xx01 -Credential $Credential -Scope Global -Persist
    I'll be doing this programmatically - running as a service on a backend server.

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  2. #2
    Angel of Code Niya's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    So you're trying to read a drive on a Linux instance from a Windows Service written in .Net? Is that correct?
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  3. #3

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    MS SQL Powerposter szlamany's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    Yes.

    If I run this code I get: System.IO.IOException: 'The user name or password is incorrect.

    If I run the script that maps that I: drive (that POWERSHELL thing in my first post), then this code works fine and makes a test.txt file on that IP address/folder name

    Code:
    Imports System.IO
    
    Public Class Form1
        Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
            Dim strFolder As String = "\\xxx.xx.xx.xxx\DX01"
            Dim strFilename As String = strFolder + "\test.txt"
            Using fs As New StreamWriter(strFilename)
                fs.WriteLine("Hello World")
            End Using
        End Sub
    End Class

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  4. #4
    Angel of Code Niya's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    Hmmm....It seems the communication needs to be authenticated which isn't surprising. When I need to connect to a Windows machine from Ubuntu to read a Windows drive though SMB, it does require me to enter the user name and password of a Windows account. It seems that your code also needs to be authenticated.

    You can try making identical accounts on both Linux and Windows. Identical user name and password. Log in to that account on Windows and run your code again and see if that works.
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  5. #5

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    Re: How to access a LINUX SMB share to create a simple text file

    I am very far away from the linux box and have little IT support for requests...

    I need IIS running on a web server to drop text files into this share. I can store credentials in my web.config file, but I am clueless on how to supply them. I see .Net 5 has an AuthenticatedStream class...

    If i could run the code for mapping the drive someone - that "opens" the folder for credential-less access - athough if that behaves the same on a server as it does on my workstation will have to be tested as well.

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  6. #6
    Angel of Code Niya's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    So you know the credentials of the Linux machine I assume? If you don't have control over the Linux machine then create the account on the Windows side to match the Linux machine and see if that works.
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    C++ programmers will dismiss you as a cretinous simpleton for your inability to keep track of pointers chained 6 levels deep and Java programmers will pillory you for buying into the evils of Microsoft. Meanwhile C# programmers will get paid just a little bit more than you for writing exactly the same code and VB6 programmers will continue to whitter on about "footprints". - FunkyDexter

    There's just no reason to use garbage like InputBox. - jmcilhinney

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  7. #7

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    Re: How to access a LINUX SMB share to create a simple text file

    I've got this working so far - when I run it on my workstation.

    I'm about to put it on the server and run it in IIS. If that PROC.START runs in the same context as the executing web thread in IIS, then this might work...

    Code:
    Imports System.IO
    
    Public Class Form1
        Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
            Dim strFolder As String = "\\172.16.47.100\DX01"
            Dim strFilename As String = strFolder + "\test.txt"
    
            Open_Remote_Connection("111.222.333.100", "xyzxyz", "123456")
    
            Using fs As New StreamWriter(strFilename)
                fs.WriteLine("Hello World")
            End Using
        End Sub
    
        Public Sub Open_Remote_Connection(ByVal strComputer As String, ByVal strUsername As String, ByVal strPassword As String)
            Try
                Dim procInfo As New ProcessStartInfo
                procInfo.FileName = "net"
                procInfo.Arguments = "use \\" & strComputer & "\DX01 /USER:" & strUsername & " " & strPassword
                procInfo.WindowStyle = ProcessWindowStyle.Hidden
                procInfo.CreateNoWindow = True
    
                Dim proc As New Process
                proc.StartInfo = procInfo
                proc.Start()
                proc.WaitForExit(15000)
            Catch ex As Exception
                MsgBox("Open_Remote_Connection" & vbCrLf & vbCrLf & ex.Message, 4096, "Error")
            End Try
        End Sub
    End Class

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  8. #8
    PowerPoster wqweto's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    WARNING!!! C# code ahead :-))

    Code:
    using System;
    using System.ComponentModel;
    using System.Runtime.InteropServices;
    
    public class UncShareWithCredentials : IDisposable
    {
        private string _uncShare;
    
        public UncShareWithCredentials(string uncShare, string userName, string password)
        {
            var nr = new Native.NETRESOURCE
            {
                dwType = Native.RESOURCETYPE_DISK,
                lpRemoteName = uncShare
            };
    
            int result = Native.WNetUseConnection(IntPtr.Zero, nr, password, userName, 0, null, null, null);
            if (result != Native.NO_ERROR)
            {
                throw new Win32Exception(result);
            }
            _uncShare = uncShare;
        }
    
        public void Dispose()
        {
            if (!string.IsNullOrEmpty(_uncShare))
            {
                Native.WNetCancelConnection2(_uncShare, Native.CONNECT_UPDATE_PROFILE, false);
                _uncShare = null;
            }
        }
    
        private class Native
        {
            public const int RESOURCETYPE_DISK = 0x00000001;
            public const int CONNECT_UPDATE_PROFILE = 0x00000001;
            public const int NO_ERROR = 0;
    
            [DllImport("mpr.dll")]
            public static extern int WNetUseConnection(IntPtr hwndOwner, NETRESOURCE lpNetResource, string lpPassword, string lpUserID,
                int dwFlags, string lpAccessName, string lpBufferSize, string lpResult);
    
            [DllImport("mpr.dll")]
            public static extern int WNetCancelConnection2(string lpName, int dwFlags, bool fForce);
    
            [StructLayout(LayoutKind.Sequential)]
            public class NETRESOURCE
            {
                public int dwScope;
                public int dwType;
                public int dwDisplayType;
                public int dwUsage;
                public string lpLocalName;
                public string lpRemoteName;
                public string lpComment;
                public string lpProvider;
            }
        }
    }
    Just create an instance of UncShareWithCredentials for your \\server\share with proper credentials and you can then directly access \\server\share from this point on in all I/O operations (not only in your process) -- the OS will use the cached credentials as long as the instance of UncShareWithCredentials is not disposed.

    cheers,
    </wqw>

  9. #9

    Thread Starter
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    Re: How to access a LINUX SMB share to create a simple text file

    Quote Originally Posted by wqweto View Post
    WARNING!!! C# code ahead :-))

    Code:
    using System;
    using System.ComponentModel;
    using System.Runtime.InteropServices;
    
    public class UncShareWithCredentials : IDisposable
    {
        private string _uncShare;
    
        public UncShareWithCredentials(string uncShare, string userName, string password)
        {
            var nr = new Native.NETRESOURCE
            {
                dwType = Native.RESOURCETYPE_DISK,
                lpRemoteName = uncShare
            };
    
            int result = Native.WNetUseConnection(IntPtr.Zero, nr, password, userName, 0, null, null, null);
            if (result != Native.NO_ERROR)
            {
                throw new Win32Exception(result);
            }
            _uncShare = uncShare;
        }
    
        public void Dispose()
        {
            if (!string.IsNullOrEmpty(_uncShare))
            {
                Native.WNetCancelConnection2(_uncShare, Native.CONNECT_UPDATE_PROFILE, false);
                _uncShare = null;
            }
        }
    
        private class Native
        {
            public const int RESOURCETYPE_DISK = 0x00000001;
            public const int CONNECT_UPDATE_PROFILE = 0x00000001;
            public const int NO_ERROR = 0;
    
            [DllImport("mpr.dll")]
            public static extern int WNetUseConnection(IntPtr hwndOwner, NETRESOURCE lpNetResource, string lpPassword, string lpUserID,
                int dwFlags, string lpAccessName, string lpBufferSize, string lpResult);
    
            [DllImport("mpr.dll")]
            public static extern int WNetCancelConnection2(string lpName, int dwFlags, bool fForce);
    
            [StructLayout(LayoutKind.Sequential)]
            public class NETRESOURCE
            {
                public int dwScope;
                public int dwType;
                public int dwDisplayType;
                public int dwUsage;
                public string lpLocalName;
                public string lpRemoteName;
                public string lpComment;
                public string lpProvider;
            }
        }
    }
    Just create an instance of UncShareWithCredentials for your \\server\share with proper credentials and you can then directly access \\server\share from this point on in all I/O operations (not only in your process) -- the OS will use the cached credentials as long as the instance of UncShareWithCredentials is not disposed.

    cheers,
    </wqw>
    Thank you very much!

    And I can handle the C# - when I dipped my toes in WPF a few years ago I forced myself to use C# so I could get fluent in it - since I'm already a decade into heavy JavaScript code anyway, curly brackets and semicolons are cool!

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  10. #10

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    Re: How to access a LINUX SMB share to create a simple text file

    @wqw

    Here is the class in VB. For some reason the Dispose that is canceling the share does not appear to work (see more comments and code snippets below).

    Code:
    Public Class UncShareWithCredentials : Implements IDisposable
    
        Private _uncShare As String
    
        Public Sub New(ByVal uncShare As String, ByVal userName As String, ByVal password As String)
            Dim nr = New Native.NETRESOURCE With {.dwType = Native.RESOURCETYPE_DISK, .lpRemoteName = uncShare}
            Dim result As Integer = Native.WNetUseConnection(IntPtr.Zero, nr, password, userName, 0, Nothing, Nothing, Nothing)
    
            If result <> Native.NO_ERROR Then
                Throw New Win32Exception(result)
            End If
    
            _uncShare = uncShare
        End Sub
    
        Public Sub Dispose() Implements IDisposable.Dispose
            If Not String.IsNullOrEmpty(_uncShare) Then
                Native.WNetCancelConnection2(_uncShare, Native.CONNECT_UPDATE_PROFILE, False)
                _uncShare = Nothing
            End If
        End Sub
    
        Private Class Native
            Public Const RESOURCETYPE_DISK As Integer = &H1
            Public Const CONNECT_UPDATE_PROFILE As Integer = &H1
            Public Const NO_ERROR As Integer = 0
            <DllImport("mpr.dll")> Public Shared Function WNetUseConnection(ByVal hwndOwner As IntPtr, ByVal lpNetResource As NETRESOURCE, ByVal lpPassword As String, ByVal lpUserID As String, ByVal dwFlags As Integer, ByVal lpAccessName As String, ByVal lpBufferSize As String, ByVal lpResult As String) As Integer
    
            End Function
            <DllImport("mpr.dll")> Public Shared Function WNetCancelConnection2(ByVal lpName As String, ByVal dwFlags As Integer, ByVal fForce As Boolean) As Integer
    
            End Function
    
            <StructLayout(LayoutKind.Sequential)> Public Class NETRESOURCE
                Public dwScope As Integer
                Public dwType As Integer
                Public dwDisplayType As Integer
                Public dwUsage As Integer
                Public lpLocalName As String
                Public lpRemoteName As String
                Public lpComment As String
                Public lpProvider As String
            End Class
        End Class
    End Class
    The code below has been tested both on a workstation and on a web server running IIS.

    Test Bed 1 fails - bad username / password. This is the expected behavior.

    Test Bed 2 uses the UNC share class and the file gets created.

    Problem is that running Test Bed 1 again now works. Whatever was done in Test Bed 2 has persisted. I'm not sure this is a problem - but I want to know why or what I can do to fix it.

    I have stepped through the code and the DISPOSE is getting called and is not encountering any errors. TIA!

    Code:
    Dim strFolder As String = "\\111.333.222.111\xx01"
    Dim strFilename As String = strFolder & "\testbed" & strTestBed & ".txt"
    
    Select Case strTestBed
        Case "1"
            Try
                strResult = DateTime.Now.ToString()
                Using fs As New StreamWriter(strFilename)
                    fs.WriteLine(strResult)
                End Using
            Catch ex As Exception
                strResult = "?Bed 1 Error:" & ex.Message
            End Try
        Case "2"
            Try
                Using xyz As UncShareWithCredentials = New UncShareWithCredentials(strFolder, "scz123", "scz123")
                    strResult = DateTime.Now.ToString()
                    Using fs As New StreamWriter(strFilename)
                        fs.WriteLine(strResult)
                    End Using
                End Using
            Catch ex As Exception
                strResult = "?Bed 2 Error:" & ex.Message
            End Try
        Case Else
            strResult = "?Unknown Test Bed value=" & strTestBed
    End Select

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  11. #11
    Angel of Code Niya's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    Quote Originally Posted by wqweto View Post
    WARNING!!! C# code ahead :-))
    No warning needed I think it's safe to say that most experienced VB.Net developers read a lot of C# code since there is a lot more of it out there. We learn to do a lot of things in VB.Net by reading C# code.
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    C++ programmers will dismiss you as a cretinous simpleton for your inability to keep track of pointers chained 6 levels deep and Java programmers will pillory you for buying into the evils of Microsoft. Meanwhile C# programmers will get paid just a little bit more than you for writing exactly the same code and VB6 programmers will continue to whitter on about "footprints". - FunkyDexter

    There's just no reason to use garbage like InputBox. - jmcilhinney

    The threads I start are Niya and Olaf free zones. No arguing about the benefits of VB6 over .NET here please. Happiness must reign. - yereverluvinuncleber

  12. #12
    PowerPoster wqweto's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    I think this is expected behavior -- Windows caches credentials used for remote shares for a few minutes. Not sure what is the timeout on these.

    Also this "stateful" behavior is global i.e. you can view the share with cached credentials in Explorer in the meantime too, not only from your process.

    It looks like SMB/Netman legacy has grown to a big ball of mud with no prospect of fixing anything there since Win 3.11.

    cheers,
    </wqw>

  13. #13
    Angel of Code Niya's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    Quote Originally Posted by szlamany View Post
    Problem is that running Test Bed 1 again now works. Whatever was done in Test Bed 2 has persisted. I'm not sure this is a problem - but I want to know why or what I can do to fix it.
    I think I know what might be happening. I'm guessing there's some kind of impersonation going on that isn't getting undone. In any case, I have some code from a program I wrote years ago. I'm gonna see if I can dig it up. I'm curious as to what will happen when you use it. I'll brb.
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    C++ programmers will dismiss you as a cretinous simpleton for your inability to keep track of pointers chained 6 levels deep and Java programmers will pillory you for buying into the evils of Microsoft. Meanwhile C# programmers will get paid just a little bit more than you for writing exactly the same code and VB6 programmers will continue to whitter on about "footprints". - FunkyDexter

    There's just no reason to use garbage like InputBox. - jmcilhinney

    The threads I start are Niya and Olaf free zones. No arguing about the benefits of VB6 over .NET here please. Happiness must reign. - yereverluvinuncleber

  14. #14
    Angel of Code Niya's Avatar
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    Re: How to access a LINUX SMB share to create a simple text file

    Ok sorry I took so long. Some important things came up after I made that last post. Had to go deal with it.

    Anyways put this class in your program:-
    Code:
    Public Class WindowsAccount
    
        Const LOGON32_PROVIDER_DEFAULT As Integer = 0
        Const LOGON32_LOGON_INTERACTIVE As Integer = 2
    
        <DllImport("advapi32.dll", CharSet:=CharSet.Unicode)>
        Private Shared Function LogonUser(ByVal lpszUsername As String,
                                          ByVal lpszDomain As String,
                                          ByVal lpszPassword As String,
                                          ByVal dwLogonType As Integer,
                                          ByVal dwLogonProvider As Integer,
                                          ByRef phToken As IntPtr) As Boolean
        End Function
    
        <DllImport("kernel32.dll")>
        Private Shared Function CloseHandle(ByVal handle As IntPtr) As Boolean
        End Function
    
        Private _context As WindowsImpersonationContext
    
        Public Sub Login(ByVal userName As String, ByVal password As String)
            Dim winID As WindowsIdentity
            Dim token As IntPtr
    
            If Not LogonUser(userName, "", password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, token) Then
                Throw New Exception("Login failed.")
            End If
    
            winID = New WindowsIdentity(token)
    
            _context = winID.Impersonate
    
            If Not CloseHandle(token) Then
                Throw New Exception("Failed to close token handle")
            End If
        End Sub
    
        Public Sub LogOut()
            _context.Dispose()
        End Sub
    
    End Class
    I just wrote that class and what does is cause the current thread to run in the context of another user, basically impersonating that user. You can use it like this:-
    Code:
            
            Dim wa As New WindowsAccount
    
            'Log in as user "dingdong"
            wa.Login("dingdong", "password12345")
    
            'Print the user name of the currently logged in user to prove it works
            Debug.WriteLine(WindowsIdentity.GetCurrent.Name)
    
            'Log out
            wa.LogOut()
    
            'Print the user name of the currently logged in user
            'to prove we logged out
            Debug.WriteLine(WindowsIdentity.GetCurrent.Name)
    So what you can do is use the class the log in as the user that has authorization to the Linux share and then run your normal StreamWriter code and see if it works. Note though, the user account must exist on the machine where that code is running. If it works it would give sufficient clues about what is actually happening internally to form an accurate hypothesis about what is going on.
    Treeview with NodeAdded/NodesRemoved events | BlinkLabel control | Calculate Permutations | Object Enums | ComboBox with centered items | .Net Internals article(not mine) | Wizard Control | Understanding Multi-Threading | Simple file compression | Demon Arena

    Copy/move files using Windows Shell

    C++ programmers will dismiss you as a cretinous simpleton for your inability to keep track of pointers chained 6 levels deep and Java programmers will pillory you for buying into the evils of Microsoft. Meanwhile C# programmers will get paid just a little bit more than you for writing exactly the same code and VB6 programmers will continue to whitter on about "footprints". - FunkyDexter

    There's just no reason to use garbage like InputBox. - jmcilhinney

    The threads I start are Niya and Olaf free zones. No arguing about the benefits of VB6 over .NET here please. Happiness must reign. - yereverluvinuncleber

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