SshHostKeyConfirmation Event

In This Topic

The event occurs when host key verification during establishing connection failed.

Syntax

Visual Basic
C#

'Declaration
 
Public Event SshHostKeyConfirmation As SshHostKeyConfirmationHandler

public event SshHostKeyConfirmationHandler SshHostKeyConfirmation

Event Data

The event handler receives an argument of type SshHostKeyConfirmationEventArgs containing data related to this event. The following SshHostKeyConfirmationEventArgs properties provide information specific to this event.

Property	Description
Confirmation	Gets or sets the value, indicating whether to continue connecting after this event.
Host	Gets the name of the host, we are connecting with.
KeyType	Gets the server public key type.
Md5Fingerprint	Gets the string representation of the server public key fingerprint, generated with MD5 hash algorithm
Port	Gets the port, we are connecting with.
Sha1Fingerprint	Gets the string representation of the server public key fingerprint, generated with SHA1 hash algorithm
Warning	Gets the warning message string.

Remarks

You may use this event to handle the situation when you don't have the host key, and have only its fingerprint. Devart.Common.SshHostKeyConfirmationEventArgs.Md5Fingerprint and Devart.Common.SshHostKeyConfirmationEventArgs.Sha1Fingerprint properties contain the string representation of the fingerprint, generated by the corresponding algorythm, as the hexadecimal digits. If you agree to continue connecting, you should set the Devart.Common.SshHostKeyConfirmationEventArgs.Confirmation property to Devart.Common.SshHostKeyConfirmation.Confirm.

Example

csharp

static void Main(string[] args) {

        PgSqlConnection conn = new PgSqlConnection("host=server;database=test;user id=postgres;");
        conn.ConnectionTimeout = 300;

        conn.SshOptions.AuthenticationType = SshAuthenticationType.Password;
        conn.SshOptions.Host = "testHost";
        conn.SshOptions.Port = 22;
        conn.SshOptions.User = "testUser";
        conn.SshOptions.Password = "test";
        // set host key  verification options
        conn.SshOptions.StrictHostKeyChecking = true;
        conn.SshOptions.HostKey = @"D:\Test\HostKey.pub"; // file with incorrect key
        conn.SshHostKeyConfirmation += new SshHostKeyConfirmationHandler(conn_SshHostKeyConfirmation);

        try {
                conn.Open();
                Console.WriteLine("\nConnected successfully");
        }
        catch (Exception ex) {
                Console.WriteLine("\nConnection failed: {0}", ex.Message);
        }

        Console.ReadKey();
}

static void conn_SshHostKeyConfirmation(object sender, SshHostKeyConfirmationEventArgs e) {

        Console.WriteLine("--------- Warning message --------");
        Console.WriteLine(e.Warning);
        Console.WriteLine("---------Host Key information--------");
        Console.WriteLine("Host - {0}", e.Host);
        Console.WriteLine("Port - {0}", e.Port);
        Console.WriteLine("Key Type - {0}", e.KeyType);
        Console.WriteLine("Md5Fingerprint - {0}", e.Md5Fingerprint);
        Console.WriteLine("Sha1Fingerprint - {0}", e.Sha1Fingerprint);
        Console.WriteLine("-------------------------------------");
        Console.Write("Continue?: ");
        if (Console.ReadKey().Key == ConsoleKey.Y)
                e.Confirmation = SshHostKeyConfirmation.Confirm;
        else
                e.Confirmation = SshHostKeyConfirmation.NotConfirm;
}

Visual Basic

Module Module1
        Sub Main()
                Dim conn As PgSqlConnection = New PgSqlConnection("host=server;database=test;user id=postgres;")
                conn.ConnectionTimeout = 300
                ' set ssh options
                conn.SshOptions.AuthenticationType = SshAuthenticationType.Password
                conn.SshOptions.Host = "testHost"
                conn.SshOptions.Port = 22
                conn.SshOptions.User = "testUser"
                conn.SshOptions.Password = "test"
                ' set host key  verification options
                conn.SshOptions.StrictHostKeyChecking = True
                conn.SshOptions.HostKey = "D:\Test\HostKey.pub"; ' file with incorrect key
                AddHandler conn.SshHostKeyConfirmation, AddressOf conn_SshHostKeyConfirmation

                Try
                        conn.Open()
                        Console.WriteLine(vbCrLf + "Connected successfully")
                Catch ex As Exception
                        Console.WriteLine(vbCrLf + "Connection failed: {0}", ex.Message)
                End Try

                Console.ReadKey()
        End Sub

        Sub conn_SshHostKeyConfirmation(ByVal sender As Object, ByVal e As SshHostKeyConfirmationEventArgs)

                Console.WriteLine("--------- Warning message --------")
                Console.WriteLine(e.Warning)
                Console.WriteLine("---------Host Key information--------")
                Console.WriteLine("Host - {0}", e.Host)
                Console.WriteLine("Port - {0}", e.Port)
                Console.WriteLine("Key Type - {0}", e.KeyType)
                Console.WriteLine("Md5Fingerprint - {0}", e.Md5Fingerprint)
                Console.WriteLine("Sha1Fingerprint - {0}", e.Sha1Fingerprint)
                Console.WriteLine("-------------------------------------")
                Console.Write("Continue?: ")

                If (Console.ReadKey().Key = ConsoleKey.Y) Then
                        e.Confirmation = SshHostKeyConfirmation.Confirm
                Else
                        e.Confirmation = SshHostKeyConfirmation.NotConfirm
                End If
        End Sub
End Module

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

PgSqlConnection Class
PgSqlConnection Members
SshHostKeyConfirmationEventArgs Class
SshHostKeyConfirmationHandler Delegate

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