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03.26.2008 at 11:13AM PDT, ID: 23271497
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How to configure non-interactive (batch) access to Cisco router via SSH

Tags: Cisco, IOS, Cisco, Router, 2800 series, IOS advanced-encryption image
Hi all.
For my management stuff I'm used to write scripts which execute remote command on a Cisco router by mean of the good-old "rsh" utility. The Cisco configuration is straightforward and well documnted (ip rcmd-enable / ip rcmd remote-host ... etc.), I have NO problems in running this way.
For security reasons I want to switch from "rsh" to "ssh" in order to execute commands ove a "secure" connection.
I already have SSH properly configured on my Cisco device and CAN login into the router via my ssh client (OpenSSH / Linux) in INTERACTIVE mode.
What I would like to do, now, is the ability to execute commands on the router in NON-INTERACTIVE (batch) mode, that is, with automatic (possibly rsa-based) authentication. I already use this mode to run commands on remote Linux servers: it simply requires to add the public key of the "client user" on the "server" (that is: the "accepting" machine) and to properly configure the related stuff, in order to have an automatically-autenticated ssh session with the ability to send arbitrary commands to the remote system.
After carefully reading all the docs/manuals available I was not able to correctly setup such scenario on my cisco device: when trying to connect to the router, it always asks for a password to be typed at the client console and this prohibits a non-interactive command execution.
Can you give me some hints?
Hope the question is clear.
-- rock
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Question Stats
Zone: Software
Question Asked By: rock
Solution Provided By: rock
Participating Experts: 3
Solution Grade: A
Views: 83
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03.26.2008 at 11:40AM PDT, ID: 21214841

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03.26.2008 at 12:36PM PDT, ID: 21215326

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03.26.2008 at 11:54PM PDT, ID: 21219083

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03.26.2008 at 11:57PM PDT, ID: 21219092

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03.27.2008 at 07:08AM PDT, ID: 21221458

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03.26.2008 at 11:40AM PDT, ID: 21214841
You might be able to use expect scripts to do the interactive login and then the execution of your command.
http://bash.cyberciti.biz/security/sshlogin.exp.php
http://www.cpqlinux.com/expect.html
http://search.cpan.org/perldoc?Net%3A%3ASSH%3A%3AExpect
may prove useful.
Assisted Solution
 
03.26.2008 at 12:36PM PDT, ID: 21215326
If you do any perl code, this guy's perl module is designed around automated cisco configuration over ssh (or telnet).

Net::Appliance::Session
http://search.cpan.org/~oliver/Net-Appliance-Session-0.21/lib/Net/Appliance/Session/Cookbook/Intro.pod
Assisted Solution
 
03.26.2008 at 11:54PM PDT, ID: 21219083
i don't know how cisco router works but it this is how it can be done in linux, called  passwordless ssh login which uses the rsh key to authenticate. how to do it in linux is described here

http://dhavalv.wordpress.com/2008/01/31/passwordless-ssh-login/

hope it helps :)
 
03.26.2008 at 11:57PM PDT, ID: 21219092
i mean rsa key not rsh ...sorry for typo
 
03.27.2008 at 07:08AM PDT, ID: 21221458
Thank you all.
Actually I already implemented a TCL/expect-based script dialogue, that is, a solution similar to what was suggested by arnold & cflong. I was just wondering if it would be possible to completely automatize the SSH authentication without "simulated interactive" session as, apart of cultural curiosity, it would prove useful to issue a single IOS command to the router. As already said in my original question, I know how to do it between Linux/unix boxes (thank you anyway, simply_dhval).
I will leave the question open but I'm starting to believe that it is, simply, not supported by IOS.
Accepted Solution
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628