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SSH
---
**Summary:** configure SSH and SSH keys (host and authorized)

This module handles most configuration for SSH and both host and authorized SSH
keys.

Authorized Keys
^^^^^^^^^^^^^^^

Authorized keys are a list of public SSH keys that are allowed to connect to a
a user account on a system. They are stored in `.ssh/authorized_keys` in that
account's home directory. Authorized keys for the default user defined in
``users`` can be specified using ``ssh_authorized_keys``. Keys
should be specified as a list of public keys.

.. note::
    see the ``cc_set_passwords`` module documentation to enable/disable SSH
    password authentication

Root login can be enabled/disabled using the ``disable_root`` config key. Root
login options can be manually specified with ``disable_root_opts``. If
``disable_root_opts`` is specified and contains the string ``$USER``,
it will be replaced with the username of the default user. By default,
root login is disabled, and root login opts are set to::

    no-port-forwarding,no-agent-forwarding,no-X11-forwarding

Supported public key types for the ``ssh_authorized_keys`` are:

    - dsa
    - rsa
    - ecdsa
    - ed25519
    - ecdsa-sha2-nistp256-cert-v01@openssh.com
    - ecdsa-sha2-nistp256
    - ecdsa-sha2-nistp384-cert-v01@openssh.com
    - ecdsa-sha2-nistp384
    - ecdsa-sha2-nistp521-cert-v01@openssh.com
    - ecdsa-sha2-nistp521
    - sk-ecdsa-sha2-nistp256-cert-v01@openssh.com
    - sk-ecdsa-sha2-nistp256@openssh.com
    - sk-ssh-ed25519-cert-v01@openssh.com
    - sk-ssh-ed25519@openssh.com
    - ssh-dss-cert-v01@openssh.com
    - ssh-dss
    - ssh-ed25519-cert-v01@openssh.com
    - ssh-ed25519
    - ssh-rsa-cert-v01@openssh.com
    - ssh-rsa
    - ssh-xmss-cert-v01@openssh.com
    - ssh-xmss@openssh.com

.. note::
    this list has been filtered out from the supported keytypes of
    `OpenSSH`_ source, where the sigonly keys are removed. Please see
    ``ssh_util`` for more information.

    ``dsa``, ``rsa``, ``ecdsa`` and ``ed25519`` are added for legacy,
    as they are valid public keys in some old distros. They can possibly
    be removed in the future when support for the older distros are dropped

.. _OpenSSH: https://github.com/openssh/openssh-portable/blob/master/sshkey.c

Host Keys
^^^^^^^^^

Host keys are for authenticating a specific instance. Many images have default
host SSH keys, which can be removed using ``ssh_deletekeys``. This prevents
re-use of a private host key from an image on multiple machines. Since
removing default host keys is usually the desired behavior this option is
enabled by default.

Host keys can be added using the ``ssh_keys`` configuration key. The argument
to this config key should be a dictionary entries for the public and private
keys of each desired key type. Entries in the ``ssh_keys`` config dict should
have keys in the format ``<key type>_private``, ``<key type>_public``, and,
optionally, ``<key type>_certificate``, e.g. ``rsa_private: <key>``,
``rsa_public: <key>``, and ``rsa_certificate: <key>``. See below for supported
key types. Not all key types have to be specified, ones left unspecified will
not be used. If this config option is used, then no keys will be generated.

.. note::
    when specifying private host keys in cloud-config, care should be taken to
    ensure that the communication between the data source and the instance is
    secure

.. note::
    to specify multiline private host keys and certificates, use yaml
    multiline syntax

If no host keys are specified using ``ssh_keys``, then keys will be generated
using ``ssh-keygen``. By default one public/private pair of each supported
host key type will be generated. The key types to generate can be specified
using the ``ssh_genkeytypes`` config flag, which accepts a list of host key
types to use. For each host key type for which this module has been instructed
to create a keypair, if a key of the same type is already present on the
system (i.e. if ``ssh_deletekeys`` was false), no key will be generated.

Supported host key types for the ``ssh_keys`` and the ``ssh_genkeytypes``
config flags are:

    - rsa
    - dsa
    - ecdsa
    - ed25519

**Internal name:** ``cc_ssh``

**Module frequency:** per instance

**Supported distros:** all

**Config keys**::

    ssh_deletekeys: <true/false>
    ssh_keys:
        rsa_private: |
            -----BEGIN RSA PRIVATE KEY-----
            MIIBxwIBAAJhAKD0YSHy73nUgysO13XsJmd4fHiFyQ+00R7VVu2iV9Qco
            ...
            -----END RSA PRIVATE KEY-----
        rsa_public: ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAGEAoPRhIfLvedSDKw7Xd ...
        rsa_certificate: |
            ssh-rsa-cert-v01@openssh.com AAAAIHNzaC1lZDI1NTE5LWNlcnQt ...
        dsa_private: |
            -----BEGIN DSA PRIVATE KEY-----
            MIIBxwIBAAJhAKD0YSHy73nUgysO13XsJmd4fHiFyQ+00R7VVu2iV9Qco
            ...
            -----END DSA PRIVATE KEY-----
        dsa_public: ssh-dsa AAAAB3NzaC1yc2EAAAABIwAAAGEAoPRhIfLvedSDKw7Xd ...
        dsa_certificate: |
            ssh-dsa-cert-v01@openssh.com AAAAIHNzaC1lZDI1NTE5LWNlcnQt ...

    ssh_genkeytypes: <key type>
    disable_root: <true/false>
    disable_root_opts: <disable root options string>
    ssh_authorized_keys:
        - ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAGEA3FSyQwBI6Z+nCSjUU ...
        - ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA3I7VUf2l5gSn5uavROsc5HRDpZ ...
    allow_public_ssh_keys: <true/false>
    ssh_publish_hostkeys:
        enabled: <true/false> (Defaults to true)
        blacklist: <list of key types> (Defaults to [dsa])
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