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.
Tested on:
- Ubuntu precise, trusty
- Debian wheezy, jessie
- FreeBSD 10.1
- EL 6,7 derived distributions
- Fedora 22, 23
- OpenBSD 6.0
It will likely work on other flavours and more direct support via suitable vars/ files is welcome.
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_manage_service
If set to False, the service/daemon won't be touched at all, i.e. will not try to enable on boot or start or reload the service. Defaults to True unless running inside a docker container (it is assumed ansible is used during build phase).
- 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 the same value as sshd_manage_service
.
- 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.
None
DANGER! This example is to show the range of configuration this role provides. Running it will likely break your SSH access to the server!
---
- 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: no
sshd_match:
- Condition: "Group xusers"
X11Forwarding: yes
roles:
- role: willshersystems.sshd
Results in:
# Ansible managed: ...
Compression yes
GSSAPIAuthentication no
UsePrivilegeSeparation no
Match Group user
GSSAPIAuthentication yes
Match Group xusers
X11Forwarding yes
The sshd_config.j2 template is programatically generated by the scripts in meta. New options should be added to the options_body or options_match.
To regenerate the template, from within the meta/ directory run:
./make_option_list >../templates/sshd_config.j2
LGPLv3
Matt Willsher matt@willsher.systems
© 2014,2015 Willsher Systems Ltd.