Send SSH-Password over C-Program

[mainway]

Hello @all!
I'd like to start a ssh-connection over a c-program. I've tried it with "pope". It looks like that:
//CODE
#include <iostream>
#include <string>
using namespace std;

int main()
{

 FILE *write_fp;
 char password[50];
 char command[50];
 sprintf(password, "thats_the_ssh_password");
 sprintf(command, "date");
 write_fp = popen("ssh -l root server", "w");
 fwrite(password, sizeof(char), strlen(password), write_fp);
 fwrite(command, sizeof(char), strlen(command), write_fp);
 pclose(write_fp);
}
//CODE
You see i try to:
- start "ssh -l root server"
- send the password to the "root@server's password: " prompt
- send a command ("date") over SSH to the server.

I've found out that SSH doesn't expect the password over the "normal-channel".
Does anybody know if there is the possibility to insert the password into the "ssh -l root server"-command?
That would solve the problem...

Thank you!
Best regards,
Mike

[Steven Hollingsworth]

On Thu, Oct 11, 2007 at 03:23:07PM -0700, mainway wrote:

>[snip code]
>
> You see i try to:
> - start "ssh -l root server"
> - send the password to the "root@server's password: " prompt
> - send a command ("date") over SSH to the server.
>
> I've found out that SSH doesn't expect the password over the
> "normal-channel".
> Does anybody know if there is the possibility to insert the password into
> the "ssh -l root server"-command?
> That would solve the problem...

Not sure about how to solve the programming problem.

I have to ask, have you thought about using a key with no passphrase[0]?

I'm assuming you want to use this for automation.

ssh -l root -i ~/.ssh/id_rsa "date"

If not there are other open source programs out there [1] that do
something similar as far as passing things to ssh.

Also, I know expect [2] can pass arguments such as passwords to ssh as well.

HTH,

~ stevo


[0] - http://pkeck.myweb.uga.edu/ssh/
[1] - http://clusterssh.wiki.sourceforge.net/Main+Page
[2] - http://rootprompt.org/article.php3?article=9187

[Jeremy C. Reed]

On Thu, 11 Oct 2007, mainway wrote:

> Does anybody know if there is the possibility to insert the password into
> the "ssh -l root server"-command?
> That would solve the problem...

Most setup password-less keys for that.

But I patched OpenSSH client in May to allow a user to set a password in
their ssh configuration.

See http://marc.info/?l=secure-shell&m=117995272708037&w=2

It is useful if you don't have control of the server itself.

Anyone have thoughts on this?

I have been using it since May.

[Alexander Klimov]

On Thu, 11 Oct 2007, mainway wrote:
> I've found out that SSH doesn't expect the password over the
> "normal-channel".

This is a feature :-). The simplest option is to use a key file with
empty password (man ssh-keygen).

> Does anybody know if there is the possibility to insert the password into
> the "ssh -l root server"-command?
> That would solve the problem...

You need a pseudo-terminal to fool ssh: the straightforward way is to
use expect <http://expect.nist.gov/FAQ.html#q1> (there is a Perl
version as well).

--
Regards,
ASK