SSH Client and Server Puppet Module

Manage SSH client and server via Puppet

Gittip

Requirements

• Exported resources for host keys management
• puppetlabs/stdlib

Usage

Since version 2.0.0 only non-default values are written to both, client and server, configuration files.

Multiple occurances of one config key (e.g. sshd should be listening on port 22 and 2222) should be passed as an array.

    options => {
      Port => [22, 2222],
    }

This is working for both, client and server

Both client and server

Host keys will be collected and distributed

    include ssh

or

    class { 'ssh':
      server_options => {
        'Match User www-data' => {
          'ChrootDirectory' => '%h',
          'ForceCommand' => 'internal-sftp',
          'PasswordAuthentication' => 'yes',
          'AllowTcpForwarding' => 'no',
          'X11Forwarding' => 'no',
        },
        Port => [22, 2222, 2288],
      },
      client_options => {
        'Host *.amazonaws.com' => {
          'User' => 'ec2-user',
        },
      },
    }

Client only

Collected host keys from servers will be written to known_hosts

    include ssh::client

or

    class { 'ssh::client':
      options => {
        'Host short' => {
          'User' => 'my-user',
          'HostName' => 'extreme.long.and.complicated.hostname.domain.tld',
        },
        'Host *' => {
          'User' => 'andromeda',
          'UserKnownHostsFile' => '/dev/null',
        },
      },
    }

Server only

Host keys will be collected for client distribution

    include ssh::server

or

    class { 'ssh::server':
      options => {
        'Match User www-data' => {
          'ChrootDirectory' => '%h',
          'ForceCommand' => 'internal-sftp',
          'PasswordAuthentication' => 'yes',
          'AllowTcpForwarding' => 'no',
          'X11Forwarding' => 'no',
        },
        'PasswordAuthentication' => 'no',
        'PermitRootLogin'        => 'no',
        'Port'                   => [22, 2222],
      },
    }

Default options

Client

    'Host *'                 => {
      'SendEnv'              => 'LANG LC_*',
      'HashKnownHosts'       => 'yes',
      'GSSAPIAuthentication' => 'yes',
    }

Server

    'ChallengeResponseAuthentication' => 'no',
    'X11Forwarding'                   => 'yes',
    'PrintMotd'                       => 'no',
    'AcceptEnv'                       => 'LANG LC_*',
    'Subsystem'                       => 'sftp /usr/lib/openssh/sftp-server',
    'UsePAM'                          => 'yes',

Overwriting default options

Default options will be merged with options passed in. If an option is set both as default and via options parameter, the latter will will win.

The following example will disable X11Forwarding, which is enabled by default:

    class { 'ssh::server':
      options           => {
        'X11Forwarding' => 'no',
      },
    }

Which will lead to the following sshd_config file:

# File is managed by Puppet

ChallengeResponseAuthentication no
X11Forwarding no
PrintMotd no
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
UsePAM yes
PasswordAuthentication no

Defining host keys for server

You can define host keys your server will use

ssh::server::host_key {'ssh_host_rsa_key':
  private_key_content => '<the private key>',
  public_key_content  => '<the public key>',
}

Alternately, you could create the host key providing the files, instead of the content:

ssh::server::host_key {'ssh_host_rsa_key':
  private_key_source => 'puppet:///mymodule/ssh_host_rsa_key',
  public_key_source  => 'puppet:///mymodule/ssh_host_rsa_key.pub',
}

Both of these definitions will create /etc/ssh/ssh_host_rsa_key and /etc/ssh/ssh_host_rsa_key.pub and restart sshd daemon.