OpenSSH Server

This role configures the OpenSSH daemon. It:

By default configures the SSH daemon with the normal OS defaults.
Works across a variety of UN*X like distributions
Can be configured by dict or simple variables
Supports Match sets
Supports all sshd_config options. Templates are programmatically generated. (see meta/make_option_list)
Tests the sshd_config before reloading sshd.

WARNING Misconfiguration of this role can lock you out of your server! Please test your configuration and its interaction with your users configuration before using in production!

WARNING Digital Ocean allows root with passwords via SSH on Debian and Ubuntu. This is not the default assigned by this module - it will set PermitRootLogin without-password which will allow access via SSH key but not via simple password. If you need this functionality, be sure to set ssh_PermitRootLogin yes for those hosts.

Requirements

Tested on:

Ubuntu precise, trusty
Debian wheezy, jessie
FreeBSD 10.1
EL 6,7 derived distributions

It will likely work on other flavours and more direct support via suitable vars/ files is welcome.

Role variables

Unconfigured, this role will provide a sshd_config that matches the OS default, minus the comments and in a different order.

sshd_skip_defaults

If set to True, don't apply default values. This means that you must have a complete set of configuration defaults via either the sshd dict, or sshd_Key variables. Defaults to False.

sshd_allow_reload

If set to False, a reload of sshd wont happen on change. This can help with troubleshooting. You'll need to manually reload sshd if you want to apply the changed configuration. Defaults to True.

sshd

A dict containing configuration. e.g.

sshd:
  Compression: delayed
  ListenAddress:
    - 0.0.0.0

ssh_...

Simple variables can be used rather than a dict. Simple values override dict values. e.g.:

sshd_Compression: off

In all cases, booleans correctly rendered as yes and no in sshd configuration. Lists can be used for multiline configuration items. e.g.

sshd_ListenAddress:
  - 0.0.0.0
  - '::'

Renders as:

ListenAddress 0.0.0.0
ListenAddress ::

sshd_match

A list of dicts for a match section. See the example playbook.

sshd_match_1 through sshd_match_9

A list of dicts or just a dict for a Match section.

Example Playbook

---
- hosts: all
  vars:
    sshd_skip_defaults: true
    sshd:
      Compression: true
      ListenAddress:
        - "0.0.0.0"
        - "::"
      GSSAPIAuthentication: no
      Match:
        - Condition: "Group user"
          GSSAPIAuthentication: yes
    sshd_UsePrivilegeSeparation: sandbox
    sshd_match:
        - Condition: "Group xusers"
          X11Forwarding: yes
  roles:
    - role: willshersystems.sshd

Results in:

# Ansible managed: ...
Compression yes
GSSAPIAuthentication no
UsePrivilegeSeparation sandbox
Match Group user
  GSSAPIAuthentication yes
Match Group xusers
  X11Forwarding yes

License

LGPLv3

Author

Matt Willsher matt@willsher.systems

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