Re: Double authentication using libssh

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

Hi,

Yes you should use ssh_userauth_password again. I never tested it
personally (because we implemented it long before OpenSSH provided that
feature) but it should work that way.

Aris

Le 29/07/15 14:18, balasubramanian Achuthan a écrit :
> Hi Tilo,
>
> Thanks, This was just a bare stripped down version. The actual version
> looks different. 
>
> So how do i pass the second password? should i again use
> ssh_userauth_password ? again?
>
> I went through the tutorial. The answer for my question is not there.
> API docs does not say anything about this SSH_AUTH_PARTIAL.
>
> Thank,
> Bala.
>
> On Wed, Jul 29, 2015 at 3:46 PM, Tilo Eckert <tilo.eckert@xxxxxxx
> <mailto:tilo.eckert@xxxxxxx>> wrote:
>
>     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.
>
>
>