sshd_config

{#- present in sshd_config and known in actual file options -#}
{%- set processed_options = [] -%}

{#- generic renderer used for sshd matches, known options, -#}
{#- and unknown options -#}
{%- macro render_option(keyword, config_dict=sshd_config) -%}
{%-   set value = config_dict.get(keyword) -%}
{%-   if value is sameas true -%}
        {{ keyword }} yes
{%    elif value is sameas false -%}
        {{ keyword }} no
{%    elif value is string or value is number -%}
        {{ keyword }} {{ value }}
{%    else -%}
{%-     for single_value in value -%}
{{ keyword }} {{ single_value }}
{%      endfor -%}
{%-   endif -%}
{%- endmacro -%}

{#- macros for render option if present -#}
{%- macro option(keyword, present) -%}
{%-   if keyword in sshd_config -%}
{%-     do processed_options.append(keyword) -%}
        {{ render_option(keyword) }}
{%-   endif -%}
{%- endmacro -%}

{#- macro for collapsing a list into a string -#}
{%- macro option_collapselist(keyword, sep, config_dict=None) -%}
{%-   if config_dict is sameas None -%}
{%-     do processed_options.append(keyword) -%}
{%-     set config_dict = sshd_config -%}
{%-   endif -%}
      {{ keyword }} {{ config_dict.get(keyword) | join(sep) }}
{% endmacro -%}

{#- macro for handling an option that can be specified as a list or a string -#}
{%- macro option_string_or_list(keyword, sep=',') -%}
{%-   if sshd_config.get(keyword, '') is string -%}
        {{ option(keyword) }}
{%-   else -%}
        {{ option_collapselist(keyword, sep) }}
{%-   endif -%}
{%- endmacro -%}

{#- macro for conditionally joining a string, list or dict(keys) to just a string -#}
{%- macro join_to_string(src, keyword, sep=',') -%}
{%-   set srcval = src.get(keyword, '') -%}
{%-   if srcval is string -%}
        {{ srcval }}
{%-   elif srcval is mapping  -%}
        {{ srcval.keys() | sort | join(sep) }}
{%-   else -%}
        {{ srcval | join(sep) }}
{%-   endif -%}
{%- endmacro -%}

{%- if sshd_config.get('ConfigBanner', False) -%}
{%-   do processed_options.append('ConfigBanner') -%}
      {{ sshd_config['ConfigBanner'] }}
{%- else -%}
# This file is managed by salt. Manual changes risk being overwritten.
{%- endif %}
{%- set global_src_url = salt ['pillar.get']('__formulas:print_template_url', None) %}
{%- set local_src_url = salt ['pillar.get']('openssh-formula:print_template_url', None) %}
{%- if (global_src_url and local_src_url is none) or local_src_url %}
#
# Template used to generate this file:
# {{ source }}
#
{%- endif %}
# The contents of the original sshd_config are kept on the bottom for
# quick reference.
# See the sshd_config(5) manpage for details

{#  Specifies which address family should be used by sshd(8). -#}
{#- Valid arguments are any, inet (use IPv4 only), or inet6 (use IPv6 only) -#}
{{- option('AddressFamily') -}}

{#- What ports, IPs and protocols we listen for -#}
{{- option('Port') -}}
{#- Use these options to restrict which interfaces/protocols sshd will bind to -#}
{{- option('ListenAddress') -}}
{{- option('Protocol') -}}
{#- HostKeys for protocol version 2 -#}
{{- option('HostKey') -}}

{#- Privilege Separation is turned on for security -#}
{{- option('UsePrivilegeSeparation') -}}

{#- Logging -#}
{{- option('SyslogFacility') -}}
{{- option('LogLevel') -}}

{#- Session idle time out -#}
{{- option('ClientAliveInterval') -}}
{{- option('ClientAliveCountMax') -}}

{#- Authentication: -#}
{{- option('LoginGraceTime') -}}
{{- option('PermitRootLogin') -}}
{{- option('StrictModes') -}}
{{- option('MaxAuthTries') -}}
{{- option('MaxSessions') -}}

{{- option('PubkeyAuthentication') -}}
{{- option('AuthorizedKeysFile') -}}
{{- option('AuthorizedKeysCommand') -}}
{{- option('AuthorizedKeysCommandUser') -}}

{#- Don't read the user's ~/.rhosts and ~/.shosts files -#}
{{- option('IgnoreRhosts') -}}
{#- similar for protocol version 2 -#}
{{- option('HostbasedAuthentication') -}}
{#- Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication -#}
{{- option('IgnoreUserKnownHosts') -}}

{#- To enable empty passwords, change to yes (NOT RECOMMENDED) -#}
{{- option('PermitEmptyPasswords') -}}

{#- Change to yes to enable challenge-response passwords (beware issues with -#}
{#- some PAM modules and threads) -#}
{{- option('ChallengeResponseAuthentication') -}}
{{- option('AuthenticationMethods') -}}

{#- Change to no to disable tunnelled clear text passwords -#}
{{- option('PasswordAuthentication') -}}

{#- Kerberos options -#}
{{- option('KerberosAuthentication') -}}
{{- option('KerberosGetAFSToken') -}}
{{- option('KerberosOrLocalPasswd') -}}
{{- option('KerberosTicketCleanup') -}}

{#- GSSAPI options -#}
{{- option('GSSAPIAuthentication') -}}
{{- option('GSSAPICleanupCredentials') -}}

{{- option('X11Forwarding') -}}
{{- option('AllowTcpForwarding') -}}
{{- option('X11DisplayOffset') -}}
{{- option('PrintMotd') -}}
{#- Bug in FreeBSD 10.3 (?) See https://lists.freebsd.org/pipermail/freebsd-stable/2016-April/084501.html -#}
{% if not (salt['grains.get']('os') == 'FreeBSD' and salt['grains.get']('osrelease')|float >= 10.3) -%}
{{- option('PrintLastLog') -}}
{% endif -%}
{{- option('TCPKeepAlive') -}}
{{- option('UseLogin') -}}

{{- option('MaxStartups') -}}
{{- option('Banner') -}}

{#- Allow client to pass locale environment variables -#}
{{- option('AcceptEnv') -}}

{{- option('Subsystem') -}}

{% if not salt['grains.get']('os') == 'OpenBSD' -%}
{#- Set this to 'yes' to enable PAM authentication, account processing, -#}
{#- and session processing. If this is enabled, PAM authentication will -#}
{#- be allowed through the ChallengeResponseAuthentication and -#}
{#- PasswordAuthentication.  Depending on your PAM configuration, -#}
{#- PAM authentication via ChallengeResponseAuthentication may bypass -#}
{#- the setting of "PermitRootLogin without-password". -#}
{#- If you just want the PAM account and session checks to run without -#}
{#- PAM authentication, then enable this but set PasswordAuthentication -#}
{#- and ChallengeResponseAuthentication to 'no'. -#}
{{- option('UsePAM') -}}
{%- endif %}

{#- DNS resolve and map remote IP addresses -#}
{{- option('UseDNS') -}}

{#- Restricting Users and Hosts -#}
{#- example: -#}
{#-  AllowUsers vader@10.0.0.1 maul@sproing.evil.com luke -#}
{#-  AllowGroups wheel staff -#}

{#- Keep in mind that using AllowUsers or AllowGroups means that anyone -#}
{#- not Matching one of the supplied patterns will be denied access by default. -#}
{#- Also, in order for sshd to allow access based on full or partial hostnames it -#}
{#- needs to to a DNS lookup -#}

{# DenyUsers -#}
{{- option_string_or_list('DenyUsers', sep=' ') -}}
{# AllowUsers -#}
{{- option_string_or_list('AllowUsers', sep=' ') -}}
{# DenyGroups -#}
{{- option_string_or_list('DenyGroups', sep=' ') -}}
{# AllowGroups -#}
{{- option_string_or_list('AllowGroups', sep=' ') -}}


{#- Specifies the available KEX (Key Exchange) algorithms. -#}
{{- option_string_or_list('KexAlgorithms') -}}

{#- Specifies the ciphers allowed for protocol version 2. -#}
{{- option_string_or_list('Ciphers') -}}

{#- Specifies the available MAC (message authentication code) algorithms. -#}
{{- option_string_or_list('MACs') -}}

{#- Handling unknown in salt template options -#}
{%- for keyword in sshd_config.keys() %}
{#-   Matches have to be at the bottom and should be handled differently -#}
{%-   if not keyword in processed_options and keyword != 'matches' -%}
{{- render_option(keyword) -}}
{%    endif -%}
{%- endfor %}

{#- Handle matches last as they need to go at the bottom -#}
{%- if 'matches' in sshd_config %}
  {%- for name, match in sshd_config['matches']|dictsort(true) %}
Match
    {#- Set up the match criteria -#}
    {%- for criteria in match['type'].keys()|sort() -%}
      {{ ' ' -}}{{criteria }} {{ join_to_string(match['type'], criteria) }}
    {%- endfor %} #{{- name }}
{#  Set up the applied options -#}
    {%- for keyword in match['options'].keys()|sort() -%}
      {%- if keyword in ['AllowUsers', 'DenyUsers', 'AllowGroups', 'DenyGroups'] -%}
            {{ option_collapselist(keyword, ' ', config_dict=match['options']) | indent(4, true) }}
{%        else -%}
            {{ render_option(keyword, config_dict=match['options']) | indent(4, true) }}
{%        endif -%}
{%-     endfor %}
  {%- endfor %}
{%- endif %}

{#- vim: set ft=jinja : -#}