aboutsummaryrefslogtreecommitdiff
path: root/README
blob: 15742d3867fe1931cb7102a979556f3195a8b693 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
Introduction
============

This puppet module manages OpenSSH configuration and services.

Dependencies
------------

This module requires puppet => 2.6, and the following modules are required
pre-dependencies:

- shared-common: git://labs.riseup.net/shared-common
- shared-lsb: git://labs.riseup.net/shared-lsb

OpenSSH Server
==============

On a node where you wish to have an openssh server installed, you should
'include sshd' on that node. If you need to configure any aspects of
sshd_config, set the variables before the include. See 'Configurable Variables'
below for what you can set.

Nagios
------

To have nagios checks setup automatically for sshd services, simply set
manage_nagios to true for that class. If you want to disable ssh
nagios checking for a particular node (such as when ssh is firewalled), then you
can set the class parameter nagios_check_ssh to false and that node will not bei
monitored.  

Nagios will automatically check the ports defined in $sshd::ports, and the
hostname specified by $nagios_check_ssh_hostname.

NOTE: this requires that you are using the shared-nagios puppet module which
supports the nagios native types via nagios::service:
git://labs.riseup.net/shared-nagios

Firewall
--------

If you wish to have firewall rules setup automatically for you, using shorewall,
you will need to set: $use_shorewall = true. The $sshd_ports that you have
specified will automatically be used.

NOTE: This requires that you are using the shared-shorewall puppet module:
git://labs.riseup.net/shared-shorewall


Configurable variables
----------------------

Configuration of sshd is strict, and may not fit all needs, however there are a
number of variables that you can consider configuring. The defaults are set to
the distribution shipped sshd_config file defaults. 

To set any of these variables, simply set them as variables in your manifests,
before the class is included, for example:

 $sshd_listen_address = ['10.0.0.1 192.168.0.1']
 $sshd_use_pam = yes
 include sshd

If you need to install a version of the ssh daemon or client package other than
the default one that would be installed by 'ensure => installed', then you can
set the following variables:

 $sshd_ensure_version = "1:5.2p2-6"
 $ssh_ensure_version = "1:5.2p2-6"

The following is a list of the currently available variables:

 $sshd_listen_address
    specify the addresses sshd should listen on set this to ['10.0.0.1
    192.168.0.1'] to have it listen on both addresses, or leave it unset to
    listen on all Default: empty -> results in listening on 0.0.0.0

 $sshd_allowed_users
    list of usernames separated by spaces.  set this for example to "foobar
    root" to ensure that only user foobar and root might login.  Default: empty
    -> no restriction is set

 $sshd_allowed_groups 
    list of groups separated by spaces. set this for example to "wheel sftponly"
    to ensure that only users in the groups wheel and sftponly might login.
    Default: empty -> no restriction is set Note: This is set after
    sshd_allowed_users, take care of the behaviour if you use these 2 options
    together.
 
 $sshd_use_pam
    if you want to use pam or not for authenticaton. Values: no or yes; Default:
    no

 $sshd_permit_root_login
    If you want to allow root logins or not. Valid values: yes, no,
    without-password, forced-commands-only; Default: without-password

 $sshd_password_authentication 
    If you want to enable password authentication or not. Valid values: yes or
    no; Default: no

 $sshd_kerberos_authentication 
    If you want the password that is provided by the user to be validated
    through the Kerberos KDC. To use this option the server needs a Kerberos
    servtab which allows the verification of the KDC's identity. Valid values:
    yes or no; Default: no

 $sshd_kerberos_orlocalpasswd  
    If password authentication through Kerberos fails, then the password will be
    validated via any additional local mechanism.  Valid values: yes or no;
    Default: yes

 $sshd_kerberos_ticketcleanup
    Destroy the user's ticket cache file on logout?  Valid values: yes or no;
    Default: yes

 $sshd_gssapi_authentication
    Authenticate users based on GSSAPI? Valid values: yes or no; Default: no

 $sshd_gssapi_cleanupcredentials
    Destroy user's credential cache on logout? Valid values: yes or no; Default:
    yes

 $sshd_challenge_response_authentication
    If you want to enable ChallengeResponseAuthentication or not When disabled,
    s/key passowords are disabled Valid values: yes or no; Default: no
 
 $sshd_tcp_forwarding
    If you want to enable TcpForwarding. Valid Values: yes or no; Default: no

 $sshd_x11_forwarding
    If you want to enable x11 forwarding. Valid Values: yes or no; Default: no

 $sshd_agent_forwarding	
    If you want to allow ssh-agent forwarding. Valid Values: yes or no; Default:
    no

 $sshd_pubkey_authentication
    If you want to enable public key authentication. Valid Values: yes or no;
    Default: yes

 $sshd_rsa_authentication 
    If you want to enable RSA Authentication. Valid Values: yes or no; Default:
    no
				
 $sshd_rhosts_rsa_authentication
    If you want to enable rhosts RSA Authentication. Valid Values: yes or no;
    Default: no

 $sshd_hostbased_authentication 
    If you want to enable HostbasedAuthentication. Valid Values: yes or no;
    Default: no
				
 $sshd_strict_modes		
    If you want to set StrictModes (check file modes/ownership before accepting
    login). Valid Values: yes or no; Default: yes

 $sshd_permit_empty_passwords
    If you want enable PermitEmptyPasswords to allow empty passwords. Valid
    Values: yes or no; Default: no

 $sshd_port   
    Deprecated, use sshd_ports instead.

 $sshd_ports
    If you want to specify a list of ports other than the default 22; Default:
    [22]

 $sshd_authorized_keys_file
    Set this to the location of the AuthorizedKeysFile
    (e.g. /etc/ssh/authorized_keys/%u). Default: AuthorizedKeysFile
    %h/.ssh/authorized_keys

 $sshd_hardened_ssl
    Use only strong SSL ciphers and MAC.
    Values: no or yes; Default: no.

 $sshd_print_motd
    Show the Message of the day when a user logs in.

 $sshd_sftp_subsystem
    Set a different sftp-subystem than the default one. Might be interesting for
    sftponly usage. Default: empty -> no change of the default

 $sshd_head_additional_options  
    Set this to any additional sshd_options which aren't listed above. Anything
    set here will be added to the beginning of the sshd_config file. This option
    might be useful to define complicated Match Blocks. This string is going to
    be included, like it is defined. So take care! Default: empty -> not added.

 $sshd_tail_additional_options  

    Set this to any additional sshd_options which aren't listed above. Anything
    set here will be added to the end of the sshd_config file. This option might
    be useful to define complicated Match Blocks. This string is going to be
    included, like it is defined. So take care! Default: empty -> not added.

 $sshd_shared_ip
    Whether the server uses a shared network IP address. If it does, then we
    don't want it to export an rsa key for its IP address.
    Values: no or yes; Default: no


Defines and functions
---------------------

Deploy authorized_keys file with the define sshd::ssh_authorized_key.

Generate a public/private keypair with the ssh_keygen function. For example, the
following will generate ssh keys and put the different parts of the key into
variables:

$ssh_keys = ssh_keygen("${$ssh_key_basepath}/backup/keys/${::fqdn}/${backup_host}")
$public_key = split($ssh_keys[1],' ')
$sshkey_type => $public_key[0]
$sshkey => $public_key[1]


Client
======

On a node where you wish to have the ssh client managed, you can do 'include
sshd::client' in the node definition. This will install the appropriate package.


License
=======

# Copyright 2008-2011, Riseup Labs micah@riseup.net
# Copyright 2008, admin(at)immerda.ch
# Copyright 2008, Puzzle ITC GmbH
# Marcel Härry haerry+puppet(at)puzzle.ch
# Simon Josi josi+puppet(at)puzzle.ch
#
# This program is free software; you can redistribute 
# it and/or modify it under the terms of the GNU 
# General Public License version 3 as published by 
# the Free Software Foundation.
#