Add basic documentation for wiki

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+.. index::
+   single: Systems; Wiki
+
+====
+Wiki
+====
+
+Purpose
+=======
+
+The purpose of the wiki server is to serve the wiki, implemented with MoinMoin.
+
+Application Links
+-----------------
+
+Wiki URL
+     https://wiki.cacert.org/
+
+Administration
+==============
+
+System Administration
+---------------------
+
+* Primary: :ref:`people_dirk`
+* Secondary: None
+
+.. todo:: find an additional admin
+
+Application Administration
+--------------------------
+
+.. todo:: document wiki admins
+
+Contact
+-------
+
+* wiki-admin@cacert.org
+
+Additional People
+-----------------
+
+:ref:`people_jandd` and :ref:`people_mario` have :program:`sudo` access on that machine too.
+
+Basics
+======
+
+Physical Location
+-----------------
+
+This system is located in an :term:`LXC` container on physical machine
+:doc:`infra02`.
+
+Logical Location
+----------------
+
+:IP Internet: :ip:v4:`213.154.225.235`
+:IP Intranet: :ip:v4:`172.16.2.12`
+:IP Internal: :ip:v4:`10.0.0.12`
+:IPv6:        :ip:v6:`2001:7b8:616:162:2::12`
+:MAC address: :mac:`00:ff:32:e3:13:66` (eth0)
+
+.. seealso::
+
+   See :doc:`../network`
+
+.. index::
+   single: Monitoring; Wiki
+
+Monitoring
+----------
+
+:internal checks: :monitor:`wiki.infra.cacert.org`
+
+DNS
+---
+
+.. index::
+   single: DNS records; Wiki
+
++------------------------+----------+----------------------------------------------+
+| Name                   | Type     | Content                                      |
++========================+==========+==============================================+
+| wiki.cacert.org.       | IN SSHFP | 2 1 04F7AB767579F004CC3AB2CC42A4CCAA24E51154 |
+| wiki.cacert.org.       | IN SSHFP | 1 1 5C3E0D3265782405E0141C47BF0E16EC14B12E08 |
+| wiki.cacert.org.       | IN A     | 213.154.225.235                              |
+| wiki.intra.cacert.org. | IN A     | 172.16.2.12                                  |
+| wiki.infra.cacert.org. | IN AAAA  | 2001:7b8:616:162:2::12                       |
+| wiki.infra.cacert.org. | IN MX    | 1 emailout.infra.cacert.org.                 |
++------------------------+----------+----------------------------------------------+
+
+.. seealso::
+
+   See :wiki:`SystemAdministration/Procedures/DNSChanges`
+
+Operating System
+----------------
+
+.. index::
+   single: Debian GNU/Linux; Wheezy
+   single: Debian GNU/Linux; 7.11
+
+* Debian GNU/Linux 7.11
+
+Services
+========
+
+Listening services
+------------------
+
++----------+---------+---------+----------------------------+
+| Port     | Service | Origin  | Purpose                    |
++==========+=========+=========+============================+
+| 22/tcp   | ssh     | ANY     | admin console access       |
++----------+---------+---------+----------------------------+
+| 25/tcp   | smtp    | local   | mail delivery to local MTA |
++----------+---------+---------+----------------------------+
+| 80/tcp   | http    | ANY     | application                |
++----------+---------+---------+----------------------------+
+| 443/tcp  | https   | ANY     | application                |
++----------+---------+---------+----------------------------+
+| 5666/tcp | nrpe    | monitor | remote monitoring service  |
++----------+---------+---------+----------------------------+
+
+Running services
+----------------
+
+.. index::
+   single: apache httpd
+   single: cron
+   single: exim4
+   single: nginx
+   single: nrpe
+   single: openssh
+   single: postfix
+   single: syslog-ng
+
++--------------------+-----------------------------------------------------+----------------------------------------------------+
+| Service            | Usage                                               | Start mechanism                                    |
++====================+=====================================================+====================================================+
+| Apache httpd       | Webserver for the Wiki                              | init script :file:`/etc/init.d/apache2`            |
++--------------------+-----------------------------------------------------+----------------------------------------------------+
+| cron               | job scheduler                                       | init script :file:`/etc/init.d/cron`               |
++--------------------+-----------------------------------------------------+----------------------------------------------------+
+| Nagios NRPE server | remote monitoring service queried by :doc:`monitor` | init script :file:`/etc/init.d/nagios-nrpe-server` |
++--------------------+-----------------------------------------------------+----------------------------------------------------+
+| openssh server     | ssh daemon for remote administration                | init script :file:`/etc/init.d/ssh`                |
++--------------------+-----------------------------------------------------+----------------------------------------------------+
+| Postfix            | SMTP server for local mail submission               | init script :file:`/etc/init.d/postfix`            |
++--------------------+-----------------------------------------------------+----------------------------------------------------+
+| syslog-ng          | syslog daemon                                       | init script :file:`/etc/init.d/syslog-ng`          |
++--------------------+-----------------------------------------------------+----------------------------------------------------+
+
+Connected Systems
+-----------------
+
+* :doc:`monitor`
+
+Outbound network connections
+----------------------------
+
+* DNS (53) resolving nameservers 172.16.2.2 and 172.16.2.3
+* :doc:`emailout` as SMTP relay
+* :doc:`proxyout` as HTTP proxy for APT
+
+Security
+========
+
+.. sshkeys::
+   :RSA:   SHA256:aRAYcstinjCnjKSqx4FyDhIXw3M/a7jWWQNOnCPIkN8 MD5:f8:16:e5:40:91:42:10:a6:ba:aa:e3:f9:1a:71:d7:09
+   :DSA:   SHA256:cgJn47gOMu4RSqz9DUvWvnHh0v3pFNfD9hrBmOYQ9ZI MD5:d5:36:2d:0c:bb:73:da:43:0c:23:61:df:b6:b9:8c:c9
+   :ECDSA: SHA256:iNc8go1W08zKxTBVi/ChsmeMI48oXD72th+gXqeC/WA MD5:09:ea:70:41:1b:bb:a4:6a:fa:fd:37:c2:29:05:35:0e
+
+Non-distribution packages and modifications
+-------------------------------------------
+
+MoinMoin in :file:`/srv/www/wiki/`.
+
+.. todo:: properly document the Wiki setup or replace it with a packaged version
+
+Risk assessments on critical packages
+-------------------------------------
+
+The whole system is outdated an end of life and must be updated.
+
+Critical Configuration items
+============================
+
+Keys and X.509 certificates
+---------------------------
+
+.. sslcert:: wiki.cacert.org
+   :altnames:   DNS:wiki.cacert.org
+   :certfile:   /etc/ssl/public/wiki.cacert.org.crt
+   :keyfile:    /etc/ssl/private/wiki.cacert.org.key
+   :serial:     138206
+   :expiration: Mar 16 12:04:29 2020 GMT
+   :sha1fp:     F8:2F:5A:31:5D:73:CD:62:F0:59:EE:6E:D6:F8:9E:95:EA:23:FE:A9
+   :issuer:     CA Cert Signing Authority
+
+:file:`/etc/ssl/certs/cacert.org.pem` CAcert.org Class 1 and Class 3 CA certificates (allowed CA certificates for client certificates)
+:file:`/etc/ssl/certs/cacert.org/` CAcert.org Class 1 certificate (certificate chain for server certificate)
+
+.. seealso::
+
+   * :wiki:`SystemAdministration/CertificateList`
+
+Apache configuration
+--------------------
+
+Apache is configured using files in :file:`/etc/apache2` integrating the MoinMoin wiki using `mod_wsgi`.
+
+.. todo:: more comprehensive Apache configuration documentation for :doc:`wiki`
+
+Changes
+=======
+
+System Future
+-------------
+
+.. todo:: update the OS of :doc:`wiki`
+
+.. todo:: introduce Puppet management for :doc:`wiki`
+
+Additional documentation
+========================
+
+.. seealso::
+
+   * :wiki:`PostfixConfiguration`
+
+References
+----------
+
+* http://moinmo.in/