cookbook 'ssh_known_hosts', '= 6.0.0'
ssh_known_hosts
(35) Versions
6.0.0
-
Follow66
Dyanmically generates /etc/ssh/ssh_known_hosts based on search indexes
cookbook 'ssh_known_hosts', '= 6.0.0', :supermarket
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ssh_known_hosts Cookbook
The Chef ssh_known_hosts
cookbook exposes a resource as well as a recipe for adding hosts and keys to the /etc/ssh/ssh_known_hosts
file, the global file for public keys on known hosts.
- The default recipe builds
/etc/ssh/ssh_known_hosts
based either on search indexes usingrsa,dsa
key types and ohai data or, when['ssh_known_hosts']['use_data_bag_cache']
istrue
, on the contents of a data bag that is maintained by thecacher
recipe running on a worker node. - The cacher recipe builds and maintains a data bag based on search indexes using
rsa,dsa
key types and ohai data. - The resource provides a way to add custom entries in your own recipes.
You can also optionally put other host keys in a data bag called "ssh_known_hosts
". See below for details.
Requirements
Platforms
- Any operating system that supports
/etc/ssh/ssh_known_hosts
.
Chef
- 12.11+
Resource
ssh_known_hosts_entry
Use the ssh_known_hosts_entry
resource to append an entry for the specified host in /etc/ssh/ssh_known_hosts
. For example:
Actions
-
:create
- Create an entry (default) -
:flush
- Immediately flush the entries to the config file (see example below)
Properties
Property | Description | Example | Default |
---|---|---|---|
host | the host to add | github.com | |
key | (optional) provide your own key | ssh-rsa ... | ssh-keyscan -H #{host} |
port | (optional) the server port that ssh-keyscan will use to gater the public key | 2222 | 22 |
timeout | (optional) limit the length of time ssh-keyscan will run for (seconds) | 90 | 30 |
mode | (optional) set the mode explicitly on the /etc/ssh/ssh_known_hosts file | '0644' | '0644' |
owner | (optional) set the owner explicitly on the /etc/ssh/ssh_known_hosts file | 'root' | 'root' |
group | (optional) set the group explicitly on the /etc/ssh/ssh_known_hosts file | 'wheel' | 'root' |
Examples
Add a single entry for github.com:
ssh_known_hosts_entry 'github.com'
This will append an entry in /etc/ssh/ssh_known_hosts
like this:
# github.com SSH-2.0-OpenSSH_5.5p1 Debian-6+squeeze1+github8 github.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==
You can optionally specify your own key, if you don't want to use ssh-keyscan
:
ssh_known_hosts_entry 'github.com' do key 'node.example.com ssh-rsa ...' end
The latest design of this cookbook only writes the /etc/ssh/ssh_known_hosts
file at the very end of the chef-client run. In order to force it to update the template earlier use the :flush
action:
ssh_known_hosts_entry "doesn't matter" do action :flush end
The user is responsible for only calling the flush action at the end of constructing their entries. Calling it first is illegal, calling it in the middle will result with partial content written to disk and chef-client will always show at least two resources being updated (and flapping).
Recipes
Cacher
Use the cacher
recipe on a single "worker" node somewhere in your cluster to maintain a data bag (server_data/known_hosts
by default) containing all of your nodes host keys. The advantage to this approach is that is much faster than running a search of all nodes, and substantially lightens the load on locally hosted Chef servers. The drawback is that the data is slightly delayed (because the cacher worker must converge first).
To use the cacher, simply include the ssh_known_hosts::cacher
cookbook in a wrapper cookbook or run list on a designated worker node.
Default Recipe
Searches the Chef Server for all hosts that have SSH host keys using rsa,dsa
key types and generates an /etc/ssh/ssh_known_hosts
.
Adding custom host keys
There are two ways to add custom host keys. You can either use the resource (see above), or by creating a data bag called "ssh_known_hosts
" and adding an item for each host:
{ "id": "github", "fqdn": "github.com", "rsa": "github-rsa-host-key" }
There are additional optional values you may use in the data bag:
Attribute | Description | Example |
---|---|---|
id | a unique id for this data bag entry | github |
fqdn | the fqdn of the host | github.com |
rsa | the rsa key for this server | ssh-rsa AAAAB3... |
ipaddress | the ipaddress of the node (if fqdn is not supplied) | 1.1.1.1 |
hostname | local hostname of the server (if not a fqdn) | myserver.local |
dsa | the dsa key for this server | ssh-dsa ABAAC3... |
Attributes
The following attributes are set on a per-platform basis, see the attributes/default.rb
.
-
node['ssh_known_hosts']['file']
- Sets up the location of the ssh_known_hosts file for the system. Defaults to '/etc/ssh/ssh_known_hosts' -
node['ssh_known_hosts']['key_type']
- Determines which key type ssh-keyscan will use to determine the host key, different systems will have different available key types, check your manpage for available key types for ssh-keyscan. Defaults to 'rsa,dsa' -
node['ssh_known_hosts']['use_data_bag_cache']
- Use the data bag maintained by the cacher server to build/etc/ssh/ssh_known_hosts
instead of a direct search (requires that a node be set up to run the cacher recipe regularly). -
node['ssh_known_hosts']['cacher']['data_bag']
/node['ssh_known_hosts']['cacher']['data_bag_item']
- Data bag where cacher recipe should store its keys.
License & Authors
Author: Cookbook Engineering Team (cookbooks@chef.io)
Copyright: 2008-2018, Chef Software, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Dependent cookbooks
This cookbook has no specified dependencies.
Contingent cookbooks
ssh_known_hosts CHANGELOG
This file is used to list changes made in each version of the ssh_known_hosts cookbook.
6.0.0 (2018-04-16)
- add a :flush action to ssh_known_hosts_entry which immediatly writes the file to disk. See the readme for an example of how to use this
- Remove action_class.class_eval and just use action_class instead
- Increase the required Chef release to 12.11 for some of the accumulator functionality we use now
- Improve testing
- Improve the docs for the resource
5.2.1 (2017-05-30)
- Resolve foodcritic warnings
5.2.0 (2017-05-30)
- Update apache2 license string
- Add supports metadata
- Remove class_eval usage and require Chef 12.7+
5.1.0 (2017-03-14)
- add support for hashed entries when using keyscan
- Test with Local Delivery instead of Rake
- add a "deprecated" recipe for back-compat-ish behavior
5.0.0 (2017-02-23)
- Require Chef 12.5+ and remove compat_resource dependency
4.1.1 (2017-01-06)
- Do not write port number if it is 22
4.1.0 (2016-12-29)
- Convert entry LWRP to a custom_resource with a delayed accumulator pattern
- Resolve sort ordering issues
- Fix for non-port-22 issues
- Add helper correctly in the recipe DSL
4.0.0 (2016-09-07)
- Require chef 12+
- Testing updates
- Remove chef 10 compatibility code
v3.1.0 (2016-07-18)
- [#59] adds mode, owner, group attributes to the entry resource
v3.0.1 (2016-07-15)
- [#58] Fix issues brought in with v3.0.0 with ssh-keyscan
- [#58] Add timeout parameter to entry resource associated with ssh-keyscan
- [#58] Cleaned up some extraneous old chef-solo code
v3.0.0 (2016-07-14)
- [#55] Remove deprecated cookbook dependency on partial_search making cookbook Chef 12+ only
v2.1.0 (2016-07-13)
- [#51] Add support for ECDSA and ED25519 keys josacar
- [#42] Check for nil FQDN realloc
v2.0.0 (2014-12-02)
- [#36] Fix the way keys are rendered
- [#22] Update to README
- [#32] Clean up logging
- [#23] Do not hash public keys
- [#34] Serverspec updates
- [#28] Add data bag caching option
- [#20] Add checspec matchers
- [#33] Add test to verify chefspec matcher
v1.3.2 (2014-04-23)
- [COOK-4579] - Do not use ssh-keyscan stderr
v1.3.0 (2014-04-09)
- [COOK-4489] Updated ssh-keyscan to include -t type
v1.2.0 (2014-02-18)
Bug
- COOK-3453 - ssh_known_hosts cookbook ruby block executes on every chef run
v1.1.0
[COOK-3765] - support ssh-keyscan using an alternative port number
v1.0.2
Bug
-
COOK-3113 - Use empty string when result is
nil
v1.0.0
This is a major release because it requires a server that supports the partial search feature.
- Chef Software Hosted Chef
- Chef Software Private Chef
- Open Source Chef 11
Improvement
- [COOK-830]: uses an inordinate amount of RAM when running exception handlers
v0.7.4
- [COOK-2440] -
ssh_known_hosts
fails to use data bag entries, doesn't grab items
v0.7.2
- [COOK-2364] - Wrong LWRP name used in recipe
v0.7.0
- [COOK-2320] - Merge
known_host
LWRP intossh_known_hosts
v0.6.0
- [COOK-2268] - Allow to run with chef-solo
v0.5.0
- [COOK-1077] - allow adding arbitrary host keys from a data bag
v0.4.0
- COOK-493: include fqdn
- COOK-721: corrected permissions
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