Re: Double authentication using libssh

[Tilo Eckert <tilo.eckert@xxxxxxx>]

Hi

if the server requires multiple authentication steps, the authentication
functions return SSH_AUTH_PARTIAL for any partial authentication step.
Only after the last step, SSH_AUTH_SUCCESS is returned, indicating
successful login.

Some notes on your implementation:
- You should set the username through ssh_options_set().
- You have no host key validation (aka known_hosts check). Without it,
you have no security at all.
- You release the session handle without disconnecting.
- Your main() never returns anything, but has return type int.

I suggest reading the tutorials about properly setting up an SSH
connection at:
http://api.libssh.org/master/libssh_tutorial.html

Regards,
Tilo

Am 29.07.2015 um 11:59 schrieb balasubramanian Achuthan:
> Hi All,
> 
> My SSH server uses double authtication. I do not know how its
> implemented. But initially its asks for a password, then again asks for
> another password to login to a separate console which is different from
> usual control.
> 
> My code is similar to the example code shown in the documentations,
> 
> #include <stdlib.h>
> #include <errno.h>
> #include <string.h>
> #include <stdio.h>
> #include <libssh/libssh.h>
> 
> 
> int main(int argc, char * argv[])
> {
> ssh_session my_ssh_session = ssh_new();
> int rc;
> char * password;
> char * username = "admin";
> // Check if ssh session exists.
> if(my_ssh_session == NULL)    
> {
> exit(-1);
> }
> 
> ssh_options_set(my_ssh_session, SSH_OPTIONS_HOST, "x.x.x.x");
> 
> rc = ssh_connect(my_ssh_session);
> if (rc != SSH_OK)
> {
> fprintf(stderr, "Error Connecting to Server: %s.\n",
> ssh_get_error(my_ssh_session));
> exit(-1);
> }
> 
> password = getpass("Password: ");
> rc = ssh_userauth_password(my_ssh_session, username, password);
> if (rc != SSH_AUTH_SUCCESS)
> {
> fprintf(stderr, "ERROR Authenticating: %s.\n",
> ssh_get_error(my_ssh_session));
> ssh_disconnect(my_ssh_session);
> ssh_free(my_ssh_session);
> }
> else
> {
> printf("Authentication Successful.\n");
> }
> 
> ssh_free(my_ssh_session);
> }
> 
> How do i implement a double authtication in this ? can you kindly help
> me out ? 
> 
> Thanks,
> Bala.