RE: Need Help in creating SSH Server using LIBSSH

[Ashish Mangla]

Hello Andreas,

Thanks for your suggestion. I have generated the public and private keys using 
GITBASH Tool.  The below commands 

ssh-keygen -t dsa -f ssh_host_dsa_key -N ''                             --> 
Worked with GIT BASH
ssh-keygen -t rsa -b 2048 -f ssh_host_rsa_key -N ''.,                   -->  It 
didn't worked with GIT BASH tool

Let me know if you are using any other tools, I set the options as you 
explained in the mail.  Below is the code .,

#include<iostream>
using namespace std;

#include"libssh/libssh.h"
#include"libssh/server.h"
#include"libssh/callbacks.h"
#include"libssh/legacy.h"
#include"libssh/sftp.h"
#include"libssh/ssh2.h"

#define SSHD_USER               "libssh"
#define SSHD_PASSWORD   "libssh"

#ifndef KEYS_FOLDER
#ifdef _WIN32
#define KEYS_FOLDER "C:\\Users\\inrasun3\\.ssh\\"
#else
#define KEYS_FOLDER "/etc/ssh/"
#endif
#endif

const int port = 22;

static int authenticate(ssh_session session); static int auth_password(const 
char *user, const char *password); void printerror(const char *pText, const 
char *pErrorInfo);

int main(void)
{
        int iError = -1;
        int iAuth = 0;
        ssh_session pSshSession = NULL;
        ssh_bind    pSshBind = NULL;
        ssh_message pSshMsg = NULL;
        ssh_channel pSshChannel = NULL;

        iError = ssh_init();
        
        if(iError == -1)
                printerror("SSH init failed", "Reason Unknown");

        pSshSession = ssh_new();                //Create SSH session

        if(pSshSession == NULL)
                printerror("SSH session creation failed", 
ssh_get_error(pSshBind));

        pSshBind    = ssh_bind_new();   //create a bind object

        if(pSshBind == NULL)
                printerror("SSH session creation failed reason ", 
ssh_get_error(pSshBind));

        iError = ssh_bind_options_set(pSshBind, SSH_BIND_OPTIONS_BINDPORT, 
&port);
        iError = ssh_bind_options_set(pSshBind, SSH_BIND_OPTIONS_DSAKEY, 
KEYS_FOLDER "ssh_host_dsa_key");
        iError = ssh_bind_options_set(pSshBind, SSH_BIND_OPTIONS_RSAKEY, 
KEYS_FOLDER "id_rsa");

        if(iError < 0 )
                printerror("Bind options set failed ", ssh_get_error(pSshBind));

        iError = ssh_bind_listen(pSshBind);

        if(iError < 0 )
        printerror("Error listening to socket ", ssh_get_error(pSshBind));

    cout<<"Started sample libssh sshd on port "<<port<<endl;
    cout<<"You can login as the user "<<SSHD_USER<<" with the password 
"<<SSHD_PASSWORD<<endl;

        iError = ssh_bind_accept(pSshBind, pSshSession);
        //ssh_bind_fd_toaccept(pSshBind);

    if(iError==SSH_ERROR)
        {
                printerror("Error accepting a connection " , 
ssh_get_error(pSshBind) );
        }

    if (ssh_handle_key_exchange(pSshSession)) {
        printf("ssh_handle_key_exchange: %s\n", ssh_get_error(pSshSession));
        return 1;
    }

         /* proceed to authentication */
        iAuth = authenticate(pSshSession);
    if(!iAuth)
        {
                printerror("Authentication error: ", 
ssh_get_error(pSshSession));
        ssh_disconnect(pSshSession);
    }


        ssh_disconnect(pSshSession);
    ssh_bind_free(pSshBind);

    ssh_finalize();
    return 0;
}

Please let me know what I am missing.

Regards
Ashish

-----Original Message-----
From: Andreas Schneider [mailto:a...@cryptomilk.org] 
Sent: Sunday, June 02, 2013 11:32 PM
To: libssh@libssh.org
Cc: Ashish Mangla
Subject: Re: Need Help in creating SSH Server using LIBSSH

On Thursday 30 May 2013 09:15:07 Ashish Mangla wrote:
> Hi
> 
> I have created a SSH server using latest release of LIBSSH library the 
> targeted environment is Windows 7 64-bit, Visual Studio 2010, but I am 
> not successful in getting it work. Despite of many trails still I am 
> getting a error "Could n't create BIO". I browsed through internet and 
> come to know that the key folder must have read access. This I checked it and 
> there is
> no problem in reading the problem ( I wrote a sample C++ program   whether
> I can open file or not. The program is successful in reading the file 
> (of course in Binary )). Now I am helpless in finding the reason for the 
> error.
> Here is what options I have set please let me know where I am doing wrong.
> 
> If any sample program for SSH server on windows is really helpful.

First you need to create a rsa and dsa host key.

ssh-keygen -t dsa -f ssh_host_dsa_key -N ''
ssh-keygen -t rsa -b 2048 -f ssh_host_rsa_key -N ''

After that you need to set them with

ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_DSAKEY, 
"/path/to/ssh_host_dsa_key"); ssh_bind_options_set(sshbind, 
SSH_BIND_OPTIONS_RSAKEY, "/path/to/ssh_host_rsa_key");

Have you done that?

> I have set the bind options with DSA and RSA key and the folder name 
> given as "C:\Users\ravikumarS\.ssh\ida_rsa.pub".

Well it expects a private key not a public key ...

-- 
Andreas Schneider                   GPG-ID: F33E3FC6
www.cryptomilk.org                a...@cryptomilk.org