Choosing best location for authorized

Choosing best location for authorized_keys!

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05-24-2012

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Choosing best location for authorized_keys!

Hello Friends,

I am trying to troubleshoot one scenario for the customer. In their server configuration, each vhost has it's own user. The option is to shell access chrooted.
The question is where would be the best place to store the authorized_keys file so that we can ssh in from the deployment server (SVN) without requiring user interaction?

The solution is needed for the deployment strategies from internally hosted SVN server to some of the websites.

I will appreciate the help in this matter.

Respectfully,

user3528

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monitoring SSH authorized_keys

LEARN ABOUT CENTOS

pam_ssh_agent_auth

pam_ssh_agent_auth(8)							PAM						     pam_ssh_agent_auth(8)

PAM_SSH_AGENT_AUTH
       This module provides authentication via ssh-agent.  If an ssh-agent listening at SSH_AUTH_SOCK can successfully authenticate that it has
       the secret key for a public key in the specified file, authentication is granted, otherwise authentication fails.

SUMMARY

       /etc/pam.d/sudo: auth	sufficient     pam_ssh_agent_auth.so file=/etc/security/authorized_keys
       /etc/sudoers:
	    Defaults	env_keep += "SSH_AUTH_SOCK"

       This configuration would permit anyone who has an SSH_AUTH_SOCK that manages the private key matching a public key in
       /etc/security/authorized_keys to execute sudo without having to enter a password. Note that the ssh-agent listening to SSH_AUTH_SOCK can
       either be local, or forwarded.

       Unlike NOPASSWD, this still requires an authentication, it's just that the authentication is provided by ssh-agent, and not password entry.

ARGUMENTS

       file=<path to authorized_keys>
	   Specify the path to the authorized_keys file(s) you would like to use for authentication. Subject to tilde and % EXPANSIONS (below)

       allow_user_owned_authorized_keys_file
	   A flag which enables authorized_keys files to be owned by the invoking user, instead of root. This flag is enabled automatically
	   whenever the expansions %h or ~ are used.

       debug
	   A flag which enables verbose logging

       sudo_service_name=<service name you compiled sudo to use>
	   (when compiled with --enable-sudo-hack)

	   Specify the service name to use to identify the service "sudo". When the PAM_SERVICE identifier matches this string, and if PAM_RUSER
	   is not set, pam_ssh_agent_auth will attempt to identify the calling user from the environment variable SUDO_USER.

	   This defaults to "sudo".

EXPANSIONS

       ~  -- same as in shells, a user's Home directory
	   Automatically enables allow_user_owned_authorized_keys_file if used in the context of ~/. If used as ~user/, it would expect the file
	   to be owned by 'user', unless you explicitely set allow_user_owned_authorized_keys_file

       %h -- User's Home directory
	   Automatically enables allow_user_owned_authorized_keys_file

       %H -- The short-hostname
       %u -- Username
       %f -- FQDN

EXAMPLES

       in /etc/pam.d/sudo

       "auth sufficient pam_ssh_agent_auth.so file=~/.ssh/authorized_keys"
	   The default .ssh/authorized_keys file in a user's home-directory

       "auth sufficient pam_ssh_agent_auth.so file=%h/.ssh/authorized_keys"
	   Same as above.

       "auth sufficient pam_ssh_agent_auth.so file=~fred/.ssh/authorized_keys"
	   If the home-directory of user 'fred' was /home/fred, this would expand to /home/fred/.ssh/authorized_keys.  In this case, we have not
	   specified allow_user_owned_authorized_keys_file, so this file must be owned by 'fred'.

       "auth sufficient pam_ssh_agent_auth.so file=/secure/%H/%u/authorized_keys allow_user_owned_authorized_keys_file"
	   On a host named foobar.baz.com, and a user named fred, would expand to /secure/foobar/fred/authorized_keys.	In this case, we specified
	   allow_user_owned_authorized_keys_file, so fred would be able to manage that authorized_keys file himself.

       "auth sufficient pam_ssh_agent_auth.so file=/secure/%f/%u/authorized_keys"
	   On a host named foobar.baz.com, and a user named fred, would expand to /secure/foobar.baz.com/fred/authorized_keys.	In this case, we
	   have not specified allow_user_owned_authorized_keys_file, so this file must be owned by root.

v0.8								    2009-08-09						     pam_ssh_agent_auth(8)

Red Hat