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.. index::
single: Systems; Git
===
Git
===
Purpose
=======
`Git`_ server for the :wiki:`Software` development and :wiki:`System
Administration <SystemAdministration/Team>` teams.
.. _Git: https://www.git-scm.com/
Application Links
-----------------
Gitweb
http://git.cacert.org/gitweb/
Administration
==============
System Administration
---------------------
* Primary: :ref:`people_jandd`
* Secondary: None
.. todo:: find an additional admin
Application Administration
--------------------------
+-------------+---------------------+
| Application | Administrator(s) |
+=============+=====================+
| Git | :ref:`people_jandd` |
+-------------+---------------------+
| Gitweb | :ref:`people_jandd` |
+-------------+---------------------+
Contact
-------
* git-admin@cacert.org
Additional People
-----------------
:ref:`people_mario`, :ref:`people_benbe` and :ref:`people_neo` 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:`213.154.225.250`
:IP Intranet: :ip:v4:`172.16.2.250`
:IP Internal: :ip:v4:`10.0.0.250`
:MAC address: :mac:`00:ff:2e:b0:4b:1b` (eth0)
.. seealso::
See :doc:`../network`
DNS
---
.. index::
single: DNS records; <machine>
===================== ======== ============================================
Name Type Content
===================== ======== ============================================
git.cacert.org. IN A 213.154.225.250
git.cacert.org. IN SSHFP 1 1 23C7622D6DB5822C809152C1C0FD9EA7838F76C6
git.cacert.org. IN SSHFP 2 1 8509DB491902FE10AB84C8F24B02F10C1ADF0E7F
git.intra.cacert.org. IN A 172.16.2.250
===================== ======== ============================================
.. seealso::
See :wiki:`SystemAdministration/Procedures/DNSChanges`
Operating System
----------------
.. index::
single: Debian GNU/Linux; Jessie
single: Debian GNU/Linux; 8.4
* Debian GNU/Linux 8.4
Applicable Documentation
------------------------
This is it :-)
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 |
+----------+---------+---------+-----------------------------+
| 9418/tcp | git | ANY | Git daemon port |
+----------+---------+---------+-----------------------------+
.. todo:: disable insecure git-daemon port and http for git, replace these with
https for read access and git+ssh for write access
Running services
----------------
.. index::
single: Apache httpd
single: Postfix
single: cron
single: nrpe
single: openssh
single: rsyslog
single: git-daemon
+--------------------+---------------------+----------------------------------------+
| Service | Usage | Start mechanism |
+====================+=====================+========================================+
| openssh server | ssh daemon for | init script :file:`/etc/init.d/ssh` |
| | remote | |
| | administration | |
+--------------------+---------------------+----------------------------------------+
| Apache httpd | Webserver for | init script |
| | gitweb | :file:`/etc/init.d/apache2` |
| | | |
+--------------------+---------------------+----------------------------------------+
| cron | job scheduler | init script :file:`/etc/init.d/cron` |
+--------------------+---------------------+----------------------------------------+
| rsyslog | syslog daemon | init script |
| | | :file:`/etc/init.d/syslog` |
+--------------------+---------------------+----------------------------------------+
| Postfix | SMTP server for | init script |
| | local mail | :file:`/etc/init.d/postfix` |
| | submission | |
+--------------------+---------------------+----------------------------------------+
| Nagios NRPE server | remote monitoring | init script |
| | service queried by | :file:`/etc/init.d/nagios-nrpe-server` |
| | :doc:`monitor` | |
+--------------------+---------------------+----------------------------------------+
| runit | service supervision | :file:`/etc/inittab` entry |
| | for git-daemon | |
+--------------------+---------------------+----------------------------------------+
| git-daemon | Daemon for native | runit service description in |
| | Git protocol | :file:`/etc/sv/git-daemon/run` |
| | access | |
+--------------------+---------------------+----------------------------------------+
Connected Systems
-----------------
* :doc:`monitor`
* :doc:`jenkins` for git repository access
Outbound network connections
----------------------------
* DNS (53) resolving nameservers 172.16.2.2 and 172.16.2.3
* :doc:`emailout` as SMTP relay
* ftp.nl.debian.org as Debian mirror
* security.debian.org for Debian security updates
* crl.cacert.org (rsync) for getting CRLs
* :doc:`jenkins` for triggering web hooks
Security
========
.. sshkeys::
:RSA: b6:85:16:ad:57:a1:45:3c:33:e5:f1:64:04:0d:7a:ab
:DSA: 27:e5:f3:95:b8:4e:73:48:b5:f2:28:8f:32:5a:96:70
:ECDSA: b2:f4:80:77:98:95:46:17:7a:9e:7d:73:65:6e:f4:9c
.. todo:: setup ED25519 host key
Dedicated user roles
--------------------
+-----------------+----------------------------------------------------+
| Group | Purpose |
+=================+====================================================+
| git-birdshack | access to :wiki:`BirdShack` git repositories |
+-----------------+----------------------------------------------------+
| softass | Software assessors |
+-----------------+----------------------------------------------------+
| git-boardvoting | access to board voting git repository |
+-----------------+----------------------------------------------------+
| git-rccrtauth | access to Roundcube certificate authentication git |
| | repository |
+-----------------+----------------------------------------------------+
| git-infra | access to infrastructure git repositories |
+-----------------+----------------------------------------------------+
.. todo:: think about regulating git access by a proper git repository manager
like gitolite
Non-distribution packages and modifications
-------------------------------------------
Gitweb has been modified to use https for `Gravatar`_ lookups:
.. code-block:: diff
--- gitweb.cgi 2014-02-06 14:01:48.696730208 +0000
+++ /usr/share/gitweb/gitweb.cgi 2014-02-06 14:03:52.933721422 +0000
@@ -2064,7 +2064,7 @@
my $email = lc shift;
my $size = shift;
$avatar_cache{$email} ||=
- "http://www.gravatar.com/avatar/" .
+ "https://secure.gravatar.com/avatar/" .
Digest::MD5::md5_hex($email) . "?s=";
return $avatar_cache{$email} . $size;
}
.. _Gravatar: http://www.gravatar.com/
Risk assessments on critical packages
-------------------------------------
The package git-daemon-run exposes the git native protocol which is prone to
man in the middle attacks that could hand out modified code to users. There are
alternatives (ssh, https) and git-daemon support should be disabled.
Critical Configuration items
============================
Keys and X.509 certificates
---------------------------
.. sslcert:: git.cacert.org
:altnames: DNS:git.cacert.org
:certfile: /etc/ssl/public/git.c.o.chain.crt
:keyfile: /etc/ssl/private/git.c.o.key
:serial: 11E84D
:expiration: Mar 31 20:07:57 18 GMT
:sha1fp: B8:F9:FF:4E:F3:F6:45:A9:44:7D:8A:1E:F5:D7:28:24:74:ED:48:46
:issuer: CA Cert Signing Authority
The :file:`/etc/ssl/public/git.c.o.chain.crt` contains the CAcert.org Class 1
certificate too.
.. seealso::
* :wiki:`SystemAdministration/CertificateList`
.. index:: Git repositories
Git repositories
----------------
.. index::
pair: Apache httpd; configuration
Apache httpd configuration
--------------------------
Apache httpd serves the gitweb interface via http and https. The http
VirtualHost redirects all traffic to https. The following changes have been
applied to the Debian package's Apache httpd configuration:
.. literalinclude:: ../configdiff/git/git-apache-config.diff
:language: diff
.. index::
pair: Gitweb; configuration
Gitweb configuration
--------------------
Gitweb is configured in :file:`/etc/gitweb.conf` which has the following
changes to the version contained in the distribution package:
.. literalinclude:: ../configdiff/git/gitweb.conf.diff
:language: diff
.. index::
pair: runit; configuration
pair: git-daemon; configuration
git-daemon configuration
------------------------
The git-daemon is started by runit. The configuration is stored in
:file:`/etc/sv/git-daemon/run` and has the following changes to the version
contained in the distribution package git-daemon-run:
.. literalinclude:: ../configdiff/git/git-daemon-run.diff
:language: diff
Tasks
=====
Planned
-------
.. todo:: enable IPv6
Changes
=======
System Future
-------------
* No plans
Additional documentation
========================
Adding a git repository
-----------------------
The git repositories are stored in :file:`/var/cache/git/`. To create a new
repository use:
.. code-block:: shell
cd /var/cache/git/
git init --bare --shared=group <reponame.git>
chgrp -R <groupname> <reponame.git>
The gitweb index is built from all repositories that contain a file
:file:`git-daemon-export-ok`. You should also put a description in the
repository's :file:`description` file and set the repository owner via:
.. code-block:: shell
cd <reponame.git>
git config gitweb.owner "Owner information"
.. seealso::
* :wiki:`PostfixConfiguration`
References
----------
Apache httpd documentation
http://httpd.apache.org/docs/2.4/
|
