Introduction into MoinMoin Configuration

Kinds of configuration files

To change how moinmoin behaves and looks, you may customize it by editing its configuration files:

  • Wiki Engine Configuration
    • the file is often called wikiconfig.py, but it can have any name
    • in that file, there is a Config class; this is the wiki engine’s configuration
    • it is written in Python
  • Framework Configuration
    • this is also located in the same file as the Wiki Engine Configuration
    • there are some UPPERCASE settings at the bottom; this is the framework’s config (for Flask and Flask extensions)
    • it is written in Python
  • Logging Configuration
    • optional; if you don’t configure this, it will use the builtin defaults
    • this is a separate file, often called logging.conf
    • it has an .ini-like file format

Do small steps and have backups

Start from one of the sample configs provided with moin and only perform small changes, then try it before testing the next change.

If you’re not used to the config file format, backup your last working config so you can revert to it in case you make some hard to find typo or other error.

Editing Python files

When editing Python files, be careful with indentation, only use multiples of 4 spaces to indent, and no tabs!

Also, be careful with syntax in general, it must be valid Python code or else it will crash with some error when trying to load the config. If that happens, read the error message, it will usually tell the line number and what the problem is. If you can’t fix it easily, then revert to your backup of your last working config.

Why use Python for configuration?

At first, you might wonder why we use Python code for configuration. One of the reasons is that it is a powerful language. MoinMoin itself is developed in Python and using something else would usually mean much more work when developing new functionality.

wikiconfig.py Layout

A wikiconfig.py looks like this:

# -*- coding: utf-8 -*-
from MoinMoin.config.default import DefaultConfig

class Config(DefaultConfig):
    # some comment
    sometext = u'your value'
    somelist = [1, 2, 3]

MOINCFG = Config  # Flask only likes uppercase characters
SOMETHING_FLASKY = 'foobar'

Let’s go through this line-by-line:

  1. this declares the encoding of the config file; make sure your editor uses the same encoding (character set), especially if you intend to use non-ASCII characters.
  2. this gets the DefaultConfig class from the moin code; it has default values for all settings and this will save you work, because you only have to define the parts that should be different from the defaults.
  3. empty line, for better readability
  4. define a new class Config that inherits most content from DefaultConfig; this is the wiki engine configuration and if you define some setting within this class, it will overwrite the setting from DefaultConfig.
  5. a # character defines a comment in your config. This line, as well as all other following lines with Config settings, is indented by 4 blanks, because Python defines blocks by indentation.
  6. define a Config attribute called sometext with value u’your value’ whereby the u’...’ means that this is a unicode string.
  7. define a Config attribute called somelist with value [1, 2, 3]; this is a list with the numbers 1, 2 and 3 as its elements.
  8. empty line, for better readability
  9. the special line “MOINCFG = Config” must stay there in exactly this form for technical reasons.
  10. UPPERCASE code at the bottom, outside the Config class is a framework configuration; usually something for Flask or some Flask extension.

A real-life example of a wikiconfig.py can be found in the docs/examples/config/ directory.

Wiki Engine Configuration

User Interface Customization

Using a custom snippets.html template

The user interface or html elements that often need customization are defined as macros in the template file snippets.html.

If you would like to customize some parts, you have to make a copy of the built-in MoinMoin/templates/snippets.html and configure moin so it will use your copy instead of the built-in one.

This is done by giving a list of template directories where moin itself will look first:

template_dirs = ['path/to/my/templates', ]

To customize something, you usually have to insert your code between the {% macro ... %} and {% endmacro %} lines, see below for more details.

Displaying license information

If you need to display something like license information for your content or some other legalese, use this macro:

{# License information in the footer #}
{% macro license_info() -%}
All wiki content is licensed under the WTFPL.
{%- endmacro %}

Inserting pieces of HTML

At some specific places, you can add a piece of your own html into the head or body of the theme’s html output:

{# Additional HTML tags inside <head> #}
{% macro head() -%}
{%- endmacro %}

{# Additional HTML before #moin-header #}
{% macro before_header() -%}
{%- endmacro %}

{# Additional HTML after #moin-header #}
{% macro after_header() -%}
{%- endmacro %}

{# Additional HTML before #moin-footer #}
{% macro before_footer() -%}
{%- endmacro %}

{# Additional HTML after #moin-footer #}
{% macro after_footer() -%}
{%- endmacro %}

Credits and Credit Logos

At the bottom of your wiki pages, usually some text and image links are shown pointing out that the wiki runs MoinMoin, uses Python, that MoinMoin is GPL licensed, etc.

If you run a public site using MoinMoin, we would appreciate if you keep those links, especially the “MoinMoin powered” one.

However, if you can’t do that for some reason, feel free to modify these macros to show something else:

{# Image links in the footer #}
{% macro creditlogos(start='<ul id="moin-creditlogos"><li>'|safe, end='</li></ul>'|safe, sep='</li><li>'|safe) %}
{{ start }}
{{ creditlogo('http://moinmo.in/', url_for('.static', filename='logos/moinmoin_powered.png'),
   'MoinMoin powered', 'This site uses the MoinMoin Wiki software.') }}
{{ sep }}
{{ creditlogo('http://moinmo.in/Python', url_for('.static', filename='logos/python_powered.png'),
   'Python powered', 'MoinMoin is written in Python.') }}
{{ end }}
{% endmacro %}

{# Text links in the footer #}
{% macro credits(start='<p id="moin-credits">'|safe, end='</p>'|safe, sep='<span>&bull;</span>'|safe) %}
{{ start }}
{{ credit('http://moinmo.in/', 'MoinMoin Powered', 'This site uses the MoinMoin Wiki software.') }}
{{ sep }}
{{ credit('http://moinmo.in/Python', 'Python Powered', 'MoinMoin is written in Python.') }}
{{ sep }}
{{ credit('http://moinmo.in/GPL', 'GPL licensed', 'MoinMoin is GPL licensed.') }}
{{ sep }}
{{ credit('http://validator.w3.org/check?uri=referer', 'Valid HTML 5', 'Click here to validate this page.') }}
{{ end }}
{% endmacro %}

Adding scripts

You can add scripts like this:

{# Additional Javascript #}
{% macro scripts() -%}
<script type="text/javascript" src="http://example.org/cool.js"></script>
{% endmacro %}

Adding CSS

To apply some style changes, add some custom css and overwrite any style you don’t like in the base theme:

{# Additional Stylesheets (after theme css, before user css #}
{% macro stylesheets() -%}
    <link media="screen" href="http://wiki.example.org/static/company.css" title="Company CSS" rel="stylesheet" />
    <link media="screen" href="http://wiki.example.org/static/red.css" title="Red Style" rel="alternate stylesheet" />
    <link media="screen" href="http://wiki.example.org/static/green.css" title="Green Style" rel="alternate stylesheet" />
{%- endmacro %}

You can either add some normal css stylesheet or add a choice of alternate stylesheets.

See:

A good way to test a stylesheet is to first use it as user CSS before configuring it for the public.

Please note that stylesheets will be included no matter what theme the user has selected, so either only apply changes to all available themes or force all users to use the same theme, so that your CSS displays correctly.

Displaying user avatars

Optionally, moin can display avatar images for the users, using gravatar.com service. To enable it, use:

user_use_gravatar = True

Please note that using the gravatar service has some privacy issues:

  • to register your image for your email at gravatar.com, you need to give them your email address, which is the same as you use in your wiki user profile.
  • when the wiki displays an avatar image on some item / view, the URL will be exposed as referrer to the avatar service provider, so they will roughly know which people read or work on which wiki items / views.

XStatic Packages

XStatic is a packaging standard to package external static files as a Python package, often third party. That way they are easily usable on all operating systems, whether it has a package management system or not.

In many cases, those external static files are maintained by someone else (like jQuery javascript library or larger js libraries) and we definitely do not want to merge them into our project.

For MoinMoin we require the following XStatic Packages in setup.py:

  • jquery for jquery lib functions loaded in the template file base.html
  • jquery_file_upload loaded in the template file of index view. It allows to upload many files at once.
  • JSON-js JSON encoders/decoders in JavaScript.
  • ckeditor used in template file modify_text_html. A WYSIWYG editor similar to word processing desktop editing applications.
  • svgweb used at base.html for enabling SVG support on many browsers.
  • svgedit_moin is loaded at template modify_svg-edit. It is a fast, web-based, Javascript-driven SVG editor.
  • twikidraw_moin a Java applet loaded from template file of modify_twikidraw. It is a simple drawing editor.
  • anywikidraw a Java applet loaded from template file of modify_anywikidraw. It can be used for editing drawings and diagrams on items.

These packages are imported in wikiconfig by:

from xstatic.main import XStatic
mod_names = ['jquery', 'jquery_file_upload', 'ckeditor',
             'svgweb', 'svgedit_moin', 'twikidraw_moin',
             'anywikidraw', ]
pkg = __import__('xstatic.pkg', fromlist=mod_names)
for mod_name in mod_names:
    mod = getattr(pkg, mod_name)
    xs = XStatic(mod, root_url='/static', provider='local', protocol='http')
    serve_files.update([(xs.name, xs.base_dir)])

In a template file you access the files of such a package by its module name:

url_for('serve.files', name='the mod name', filename='the file to load')

Adding XStatic Packages

The following example shows how you can enable the additional package XStatic-MathJax which is used for mathml or latex formulas in items content.

Just pip install xstatic-mathjax add the name ‘mathjax’ to mod_names in wikiconfig and add the required fragment in base.html:

<script type="text/x-mathjax-config">
MathJax.Hub.Config({
    extensions: ["tex2jax.js"],
    jax: ["input/TeX","output/HTML-CSS"],
    tex2jax: {inlineMath: [["$","$"],["\\(","\\)"]]}
});
</script>
<script src="{{ url_for('serve.files', name='mathjax', filename='MathJax.js') }}"></script>

Custom Themes

In case you want to do major changes to how MoinMoin displays its pages, you could also write your own theme.

Caution: developing your own theme means you also have to maintain and update it, which normally requires a long-term effort.

Todo

Add more details about custom themes

Authentication

MoinMoin uses a configurable auth list of authenticators, so the admin can configure whatever he/she likes to allow for authentication. Moin processes this list from left to right.

Each authenticator is an instance of some specific class, configuration of the authenticators usually works by giving them keyword arguments. Most have reasonable defaults though.

MoinAuth

This is the default authentication moin uses if you don’t configure something else. The user logs in by filling out the login form with username and password, moin compares the password hash against the one stored in the user’s profile and if both match, the user is authenticated:

from MoinMoin.auth import MoinAuth
auth = [MoinAuth()]  # this is the default!

HTTPAuthMoin

With HTTPAuthMoin moin does http basic authentication by itself without the help of the web server:

from MoinMoin.auth.http import HTTPAuthMoin
auth = [HTTPAuthMoin(autocreate=True)]

If configured like that, moin will request authentication by emitting a http header. Browsers then usually show some login dialogue to the user, asking for username and password. Both then gets transmitted to moin and it is compared against the password hash stored in the user’s profile.

Note: when HTTPAuthMoin is used, the browser will show that login dialogue, so users must login to use the wiki.

GivenAuth

With GivenAuth moin relies on the webserver doing the authentication and giving the result to moin, usually via the environment variable REMOTE_USER:

from MoinMoin.auth import GivenAuth
auth = [GivenAuth(autocreate=True, coding='utf-8')]

Using this method has some pros and cons:

  • you can use lots of authentication extensions available for your web server
  • but the only information moin will get via REMOTE_USER is the authenticated user’s name, nothing else. So, e.g. for LDAP/AD, you won’t get additional content stored in the LDAP directory.
  • everything you won’t get, but which you need, will need to be manually stored and updated in the user’s profile, e.g. the user’s email address, etc.

Please note that you must give the correct character set so that moin can decode the username to unicode, if necessary. For environment variables like REMOTE_USER, the coding might depend on your operating system.

If you do not know the correct coding, try: ‘utf-8’, ‘iso-8859-1’, ...

Todo

add the usual coding(s) for some platforms (like windows)

To try it out, change configuration, restart moin and then use some non-ASCII username (like with german umlauts or accented characters). If moin does not crash (log a Unicode Error), you have likely found the correct coding.

For users configuring GivenAuth on Apache, an example virtual host configuration file is included with MoinMoin in docs/examples/deployment/moin-http-basic-auth.conf.

OpenID

With OpenID moin can re-use the authentication done by some OpenID provider (like Google, Yahoo, Microsoft or others):

from MoinMoin.auth.openidrp import OpenIDAuth
auth = [OpenIDAuth()]

By default OpenID authentication accepts all OpenID providers. If you like, you can configure what providers to allow (which ones you want to trust) by adding their URLs to the trusted_providers keyword of OpenIDAuth. If left empty, moin will allow all providers:

# Allow google profile OpenIDs only:
auth = [OpenIDAuth(trusted_providers=['https://www.google.com/accounts/o8/ud?source=profiles'])]

To be able to log in with OpenID, the user needs to have his OpenID stored in his user profile.

LDAPAuth

With LDAPAuth you can authenticate users against a LDAP directory or MS Active Directory service.

LDAPAuth with single LDAP server

This example shows how to use LDAPAuth with a single LDAP/AD server:

from MoinMoin.auth.ldap_login import LDAPAuth
ldap_common_arguments = dict(
    # the values shown below are the DEFAULT values (you may remove them if you are happy with them),
    # the examples shown in the comments are typical for Active Directory (AD) or OpenLDAP.
    bind_dn='',  # We can either use some fixed user and password for binding to LDAP.
                 # Be careful if you need a % char in those strings - as they are used as
                 # a format string, you have to write %% to get a single % in the end.
                 #bind_dn = 'binduser@example.org' # (AD)
                 #bind_dn = 'cn=admin,dc=example,dc=org' # (OpenLDAP)
                 #bind_pw = 'secret'
                 # or we can use the username and password we got from the user:
                 #bind_dn = '%(username)s@example.org' # DN we use for first bind (AD)
                 #bind_pw = '%(password)s' # password we use for first bind
                 # or we can bind anonymously (if that is supported by your directory).
                 # In any case, bind_dn and bind_pw must be defined.
    bind_pw='',
    base_dn='',  # base DN we use for searching
                 #base_dn = 'ou=SOMEUNIT,dc=example,dc=org'
    scope=2, # scope of the search we do (2 == ldap.SCOPE_SUBTREE)
    referrals=0, # LDAP REFERRALS (0 needed for AD)
    search_filter='(uid=%(username)s)',  # ldap filter used for searching:
                                         #search_filter = '(sAMAccountName=%(username)s)' # (AD)
                                         #search_filter = '(uid=%(username)s)' # (OpenLDAP)
                                         # you can also do more complex filtering like:
                                         # "(&(cn=%(username)s)(memberOf=CN=WikiUsers,OU=Groups,DC=example,DC=org))"
    # some attribute names we use to extract information from LDAP (if not None,
    # if None, the attribute won't be extracted from LDAP):
    givenname_attribute=None, # often 'givenName' - ldap attribute we get the first name from
    surname_attribute=None, # often 'sn' - ldap attribute we get the family name from
    aliasname_attribute=None, # often 'displayName' - ldap attribute we get the aliasname from
    email_attribute=None, # often 'mail' - ldap attribute we get the email address from
    email_callback=None, # callback function called to make up email address
    coding='utf-8', # coding used for ldap queries and result values
    timeout=10, # how long we wait for the ldap server [s]
    start_tls=0, # usage of Transport Layer Security 0 = No, 1 = Try, 2 = Required
    tls_cacertdir=None,
    tls_cacertfile=None,
    tls_certfile=None,
    tls_keyfile=None,
    tls_require_cert=0, # 0 == ldap.OPT_X_TLS_NEVER (needed for self-signed certs)
    bind_once=False, # set to True to only do one bind - useful if configured to bind as the user on the first attempt
    autocreate=True, # set to True to automatically create/update user profiles
    report_invalid_credentials=True, # whether to emit "invalid username or password" msg at login time or not
)

ldap_authenticator1 = LDAPAuth(
    server_uri='ldap://localhost',  # ldap / active directory server URI
                                    # use ldaps://server:636 url for ldaps,
                                    # use  ldap://server for ldap without tls (and set start_tls to 0),
                                    # use  ldap://server for ldap with tls (and set start_tls to 1 or 2).
    name='ldap1',  # unique name for the ldap server, e.g. 'ldap_pdc' and 'ldap_bdc' (or 'ldap1' and 'ldap2')
    **ldap_common_arguments  # expand the common arguments
)

auth = [ldap_authenticator1, ] # this is a list, you may have multiple ldap authenticators
                               # as well as other authenticators

# customize user preferences (optional, see MoinMoin/config/multiconfig for internal defaults)
# you maybe want to use user_checkbox_remove, user_checkbox_defaults, user_form_defaults,
# user_form_disable, user_form_remove.

LDAPAuth with two LDAP servers

This example shows how to use LDAPAuth with a two LDAP/AD servers, such as in a setup with a primary controller and backup domain controller:

# ... same as for single server (except the line with "auth =") ...
ldap_authenticator2 = LDAPAuth(
    server_uri='ldap://otherldap',  # ldap / active directory server URI for second server
    name='ldap2',
    **ldap_common_arguments
)

auth = [ldap_authenticator1, ldap_authenticator2, ]

AuthLog

AuthLog is not a real authenticator in the sense that it authenticates (logs in) or deauthenticates (logs out) users. It is passively logging informations for authentication debugging:

from MoinMoin.auth import MoinAuth
from MoinMoin.auth.log import AuthLog
auth = [MoinAuth(), AuthLog(), ]

Example logging output:

2011-02-05 16:35:00,229 INFO MoinMoin.auth.log:22 login: user_obj=<MoinMoin.user.User at 0x90a0f0c name:u'ThomasWaldmann' valid:1> kw={'username': u'ThomasWaldmann', 'openid': None, 'attended': True, 'multistage': None, 'login_password': u'secret', 'login_username': u'ThomasWaldmann', 'password': u'secret', 'login_submit': u''}
2011-02-05 16:35:04,716 INFO MoinMoin.auth.log:22 session: user_obj=<MoinMoin.user.User at 0x90a0f6c name:u'ThomasWaldmann' valid:1> kw={}
2011-02-05 16:35:06,294 INFO MoinMoin.auth.log:22 logout: user_obj=<MoinMoin.user.User at 0x92b5d4c name:u'ThomasWaldmann' valid:False> kw={}
2011-02-05 16:35:06,328 INFO MoinMoin.auth.log:22 session: user_obj=None kw={}

Note: there is sensitive information like usernames and passwords in this log output. Make sure you only use this for testing only and delete the logs when done.

SMBMount

SMBMount is no real authenticator in the sense that it authenticates (logs in) or deauthenticates (logs out) users. It instead catches the username and password and uses them to mount a SMB share as this user.

SMBMount is only useful for very special applications, e.g. in combination with the fileserver storage backend:

from MoinMoin.auth.smb_mount import SMBMount

smbmounter = SMBMount(
    # you may remove default values if you are happy with them
    # see man mount.cifs for details
    server='smb.example.org',  # (no default) mount.cifs //server/share
    share='FILESHARE',  # (no default) mount.cifs //server/share
    mountpoint_fn=lambda username: u'/mnt/wiki/%s' % username,  # (no default) function of username to determine the mountpoint
    dir_user='www-data',  # (no default) username to get the uid that is used for mount.cifs -o uid=...
    domain='DOMAIN',  # (no default) mount.cifs -o domain=...
    dir_mode='0700',  # (default) mount.cifs -o dir_mode=...
    file_mode='0600',  # (default) mount.cifs -o file_mode=...
    iocharset='utf-8',  # (default) mount.cifs -o iocharset=... (try 'iso8859-1' if default does not work)
    coding='utf-8',  # (default) encoding used for username/password/cmdline (try 'iso8859-1' if default does not work)
    log='/dev/null',  # (default) logfile for mount.cifs output
)

auth = [....., smbmounter]  # you need a real auth object in the list before smbmounter

smb_display_prefix = u"S:"  # where //server/share is usually mounted for your windows users (display purposes only)

Todo

check if SMBMount still works as documented

Transmission security

Credentials

Some of the authentication methods described above will transmit credentials, like usernames and password, in unencrypted form:

  • MoinAuth: when the login form contents are transmitted to moin, they contain username and password in clear text.
  • HTTPAuthMoin: your browser will transfer username and password in a encoded (but NOT encrypted) form with EVERY request; it uses http basic auth.
  • GivenAuth: check the potential security issues of the authentication method used by your web server; for http basic auth please see HTTPAuthMoin.
  • OpenID: please check yourself.

Contents

http transmits everything in clear text and is therefore not encrypted.

Encryption

Transmitting unencrypted credentials or contents can cause serious issues in many scenarios.

We recommend you make sure the connections are encrypted, like with https or VPN or an ssh tunnel.

For public wikis with very low security / privacy needs, it might not be needed to encrypt the content transmissions, but there is still an issue for the credential transmissions.

When using unencrypted connections, wiki users are advised to make sure they use unique credentials and not reuse passwords that are used for other purposes.

Password security

Password strength

As you might know, many users are bad at choosing reasonable passwords and some are tempted to use easily crackable passwords.

To help users choose reasonable passwords, moin has a simple builtin password checker that is enabled by default and does some sanity checks, so users don’t choose easily crackable passwords.

It does check:

  • length of password (default minimum: 8)
  • amount of different characters in password (default minimum: 5)
  • password does not contain user name
  • user name does not contain password
  • password is not a keyboard sequence (like “ASDFghjkl” or “987654321”), currently we have only US and DE keyboard data built-in.

It does not check:

  • whether the password is in a well-known dictionary or password list
  • whether a password cracker can break it

If you are not satisfied with the default values, you can easily customize the checker:

from MoinMoin.config.default import DefaultConfig, _default_password_checker
password_checker = lambda cfg, name, pw: _default_password_checker(
                       cfg, name, pw, min_length=10, min_different=6)

You could also completely replace it with your own implementation.

If your site has rather low security requirements, you can disable the checker by:

password_checker = None  # no password checking

Password storage

Moin never stores wiki user passwords in clear text, but uses strong cryptographic hashes provided by the “passlib” library, see there for details:

The passlib docs recommend 3 hashing schemes that have good security: sha512_crypt, pbkdf2_sha512 and bcrypt (bcrypt has additional binary/compiled package requirements, please refer to the passlib docs in case you want to use it).

By default, we use sha512_crypt hashes with default parameters as provided by passlib (this is same algorithm as moin >= 1.9.7 used by default).

In case you experience slow logins or feel that you might need to tweak the hash generation for other reasons, please read the passlib docs. moin allows you to configure passlib’s CryptContext params within the wiki config, the default is this:

passlib_crypt_context = dict(
    schemes=["sha512_crypt", ],
)

Authorization

Moin uses Access Control Lists (ACLs) to specify who is authorized to perform a given action.

Please note that wikis usually make much use of so-called soft security, which means that they are rather open and give freedom to users, while at the same time providing the means to revert any damage that may have been caused.

Hard security means that one would lock items, etc. so that no damage can possibly be done.

Moin’s default configuration tries to give a sane compromise of both soft and hard security. However, you may need different settings depending on the situation that the wiki admin, wiki owner or wiki community will have to deal with.

So keep in mind:

  • if your wiki is rather open, you might make it easy to contribute, e.g. a user who is not a regular user of your wiki could fix some typos he has just found. However, a hostile user or bot might also put some spam into your wiki with the ability to be able to revoke the spam later.
  • if your wiki is rather closed, e.g. you require every user to first apply for an account and to log in before being able to do changes, you will rarely get contributions from casual users and maybe also less from members of your community. But, getting spam is then less likely.

ACL for functions

This ACL controls access to some specific functions / views of moin:

# the default value of acl_rights_functions for information, you usually do not have to change it:
#acl_rights_functions = ['superuser', 'notextcha', ]
acl_functions = u'+YourName:superuser TrustedEditorGroup:notextcha'

Supported capabilities (rights):

  • superuser - used for miscellaneous administrative functions. Give this only to highly trusted people
  • notextcha - if you have TextChas enabled, users with the notextcha capability won’t get questions to answer. Give this to known and trusted users who regularly edit in your wiki.

ACLs for contents

These ACLs control access to contents stored in the wiki, they are configured per storage backend (see storage backend docs) and optionally in the metadata of wiki items:

# the default value of acl_rights_contents for information, you usually do not have to change it:
#acl_rights_contents = ['read', 'write', 'create', 'destroy', 'admin', ]
... backend configuration ...
... before=u'YourName:read,write,create,destroy,admin',
... default=u'All:read,write,create',
... after=u'',
... hierarchic=False,

Usually, you have a before, on item or default and a after ACL which are processed exactly in this order. The default ACL is only used if no ACL is specified in the metadata of the item in question.

digraph acl_order {
rankdir=LR;
"before" -> "item acl from metadata (if specified)" -> "after";
"before" -> "default (otherwise)"                   -> "after";
}

How to use before/default/after:

  • before is usually used to force something, for example if you want to give some wiki admin all permissions indiscriminately
  • default is the behavior if nothing special has been specified, ie no ACL in the item’s metadata
  • after is rarely used and when it is, it is used to “not forget something unless otherwise specified”.

When configuring content ACLs, you can choose between standard (flat) ACL processing and hierarchic ACL processing. Hierarchic processing means that subitems inherit ACLs from their parent items if they don’t have an ACL themselves.

Note that while hierarchic ACLs are rather convenient sometimes, they make the system more complex. You have to be very careful with permission changes happening as a result of changes in the hierarchy, such as when you create, rename or delete items.

Supported capabilities (rights):

  • read - read content
  • write - write (edit, modify) content
  • create - create new items
  • destroy - completely destroy revisions or items; to be given only to fully-trusted users
  • admin - change (create, remove) ACLs for the item; to be given only to fully-trusted users

ACLs - special groups

In addition to the groups provided by the group backend(s), there are some special group names available within ACLs:

  • All - a virtual group containing every user
  • Known - a virtual group containing every logged-in user
  • Trusted - a virtual group containing every logged-in user who was logged in by some specific “trusted” authentication method

ACLs - basic syntax

An ACL is a unicode string with one or more access control entries which are space separated.

An entry is a colon-separated set of two values:

  • the left side is a comma-separated list of user and/or group names
  • the right side is a comma-separated list of rights / capabilities for those users/groups.

An ACL is processed from left to right, where the first left-side match counts.

Example:

u"SuperMan:read,write,create,destroy,admin All:read,write"

If “SuperMan” is currently logged in and moin processes this ACL, it will find a name match in the first entry. If moin wants to know whether he may destroy, the answer will be “yes”, as destroy is one of the capabilities/rights listed on the right side of this entry.

If “JoeDoe” is currently logged in and moin processes this ACL, the first entry won’t match, so moin will proceed left-to-right and look at the second entry. Here we have the special group name, “All” (and JoeDoe is obviously a member of this group), so this entry matches. If moin wants to know whether he may destroy, the answer will be “no”, as destroy is not listed on the right side of the “All” entry. If moin wants to know whether he may write, the answer will be “yes”.

Notes:

  • As a consequence of the left-to-right and first-match-counts processing, you must order ACL entries so that the more specific ones (like for “SuperMan”) are left of the less specific ones. Usually, you want this order:
    1. usernames
    2. special groups
    3. more general groups
    4. Trusted
    5. Known
    6. All
  • Do not put any spaces into an ACL entry, unless it is part of a user or group name.
  • A right that is not explicitly given by an applicable ACL is denied.
  • For most ACLs there are built-in defaults which give some limited rights.

ACLs - entry prefixes

To make the system more flexible, there are two ways to modify an ACL entry: prefixing it with a ‘+’ or a ‘-‘.

If you use one of the two, MoinMoin will search for both a username and permission, and a match will have to match both the name of user (left-side) and the permission MoinMoin is searching for (right-side), otherwise it will continue with the next entry.

‘+’ indicates that MoinMoin should give the permission(s) specified on the right side.

‘-‘ indicates that MoinMoin should deny the permission(s) specified on the right side.

Example:

u"+SuperMan:create,destroy,admin -Idiot:write All:read,write"

If “SuperMan” is currently logged in and moin wants to know whether he may destroy, it’ll find a match in the first entry, because the name matches and permission in question matches. As the prefix is ‘+’, the answer is “yes”. If moin wants to know whether he may write, the first entry will not match on both sides, so moin will proceed and look at the second entry. It doesn’t match, so it will look at the third entry. Of course “SuperMan” is a member of group “All”, so we have a match here. As “write” is listed on the right side, the answer will be “yes”.

If “Idiot” is currently logged in and moin wants to know whether he may write, it will find no match in the first entry, but the second entry will match. As the prefix is ‘-‘, the answer will be “no” and it will not even proceed and look at the third entry.

Notes:

  • you usually use these modifiers if most of the rights for a given user shall be specified later, but a special user or group should be treated slightly different for a few special rights.

ACLs - Default entry

There is a special ACL entry, “Default”, which expands itself in-place to the default ACL.

This is useful, for example, if when you mostly want the default ACL, but with a slight modification, but you don’t want to type in the default ACL all the time and you also want to be able to change the default ACL without having to edit lots of items.

Example:

u"-NotThisGuy:write Default"

This will behave as usual, except that “NotThisGuy” will never be given write permission.

Anti-Spam

TextChas

A TextCHA is a pure text alternative to ‘’CAPTCHAs’‘. MoinMoin uses it to prevent wiki spamming and it has proven to be very effective.

Features:

  • when registering a user or saving an item, it can ask a random question
  • moin matches the given answer against a regular expression
  • questions and answers can be configured in the wiki config
  • multi language support: a user gets a textcha in his language or in the language_default or in English, depending on availability of questions and answers for the language

TextCha Configuration

Tips for configuration:

  • have 1 word / 1 number answers
  • ask questions that normal users of your site are likely to be able to answer
  • do not ask overly complex questions
  • do not ask “computable” questions, like “1+1” or “2*3”
  • do not ask overly obvious questions
  • do not share your questions with other sites / copy questions from other sites (or spammers might try to adapt to this)
  • you should at least give textchas for ‘en’ or for your language_default, if that is not ‘en’, as this will be used as fallback if MoinMoin does not find a textcha in the user’s language

In your wiki config, do something like this:

textchas = {
    'en': { # silly english example textchas (do not use them!)
            u"Enter the first 9 digits of Pi.": ur"3\.14159265",
            u"What is the opposite of 'day'?": ur"(night|nite)",
            # ...
    },
    'de': { # some german textchas
            u"Gib die ersten 9 Stellen von Pi ein.": ur"3\.14159265",
            u"Was ist das Gegenteil von 'Tag'?": ur"nacht",
            # ...
    },
    # you can add more languages if you like
}

Note that users with ‘notextcha’ ACL capability won’t get TextChas to answer.

Secrets

Moin uses secrets to encrypt or cryptographically sign something like:

  • textchas
  • tickets

Secrets are long random strings and not a reuse of any of your passwords. Don’t use the strings shown below, they are NOT secret as they are part of the moin documentation. Make up your own secrets:

secrets = {
    'security/textcha': 'kjenrfiefbeiaosx5ianxouanamYrnfeorf',
    'security/ticket': 'asdasdvarebtZertbaoihnownbrrergfqe3r',
}

If you don’t configure these secrets, moin will detect this and reuse Flask’s SECRET_KEY for all secrets it needs.

Groups and Dicts

Moin can get group and dictionary information from some supported backends like the wiki configuration or wiki items.

A group is a list of unicode names. It can be used for any application: one application is defining user groups for usage in ACLs.

A dict is a mapping of unicode keys to unicode values. It can be used for any application. Currently, it is not used by moin itself.

Group backend configuration

The WikiGroups backend gets groups from wiki items and is used by default:

def groups(self, request):
    from MoinMoin.datastruct import WikiGroups
    return WikiGroups(request)

The ConfigGroups backend uses groups defined in the configuration file:

def groups(self, request):
    from MoinMoin.datastruct import ConfigGroups
    # Groups are defined here.
    groups = {u'EditorGroup': [u'AdminGroup', u'John', u'JoeDoe', u'Editor1'],
              u'AdminGroup': [u'Admin1', u'Admin2', u'John']}
    return ConfigGroups(request, groups)

CompositeGroups can use, for the most part, any combination of backends. The following is an example of using the ConfigGroups and WikiGroups backends:

def groups(self, request):
    from MoinMoin.datastruct import ConfigGroups, WikiGroups, CompositeGroups
    groups = {u'EditorGroup': [u'AdminGroup', u'John', u'JoeDoe', u'Editor1'],
              u'AdminGroup': [u'Admin1', u'Admin2', u'John']}

    # Here ConfigGroups and WikiGroups backends are used.
    # Note that order matters! Since ConfigGroups backend is mentioned first
    # EditorGroup will be retrieved from it, not from WikiGroups.
    return CompositeGroups(request,
                           ConfigGroups(request, groups),
                           WikiGroups(request))

Dict backend configuration

The WikiDicts backend gets dicts from wiki items and is used by default:

def dicts(self, request):
    from MoinMoin.datastruct import WikiDicts
    return WikiDicts(request)

The ConfigDicts backend uses dicts defined in the configuration file:

def dicts(self, request):
    from MoinMoin.datastruct import ConfigDicts
    dicts = {u'OneDict': {u'first_key': u'first item',
                          u'second_key': u'second item'},
             u'NumbersDict': {u'1': 'One',
                              u'2': 'Two'}}
    return ConfigDicts(request, dicts)

The CompositeDicts backend can use any combination of backends. The following is an example of using the ConfigDicts and WikiDicts backends:

def dicts(self, request):
    from MoinMoin.datastruct import ConfigDicts, WikiDicts, CompositeDicts
    dicts = {u'OneDict': {u'first_key': u'first item',
                          u'second_key': u'second item'},
             u'NumbersDict': {u'1': 'One',
                              u'2': 'Two'}}
    return CompositeDicts(request,
                          ConfigDicts(request, dicts),
                          WikiDicts(request))

Storage

MoinMoin supports storage backends as different ways of storing wiki items.

Setup of storage is rather complex and layered, involving:

  • Routing middleware that dispatches by namespace to the respective backend
  • ACL checking middleware that makes sure nobody accesses something he/she is not authorized to access
  • Indexing mixin that indexes some data automatically on commit, so items can be selected / retrieved faster.
  • storage backends that store wiki items

create_simple_mapping

This is a helper function to make storage setup easier. It helps you to:

  • create a simple setup that uses 2 storage backends internally for these namespaces:
    • default
    • userprofiles
  • configure ACLs protecting these namespaces
  • setup a router middleware that dispatches to these backends
  • setup a indexing mixin that maintains an index

Call it as follows:

from MoinMoin.storage import create_simple_mapping

namespace_mapping, backend_mapping, acl_mapping = create_simple_mapping(
    uri=...,
    default_acl=dict(before=...,
                     default=...,
                     after=...,
                     hierarchic=..., ),
    userprofiles_acl=dict(before=...,
                          default=...,
                          after=...,
                          hierarchiv=False, ),
)

The uri depends on the kind of storage backend and stores you want to use, see below. Usually it is a URL-like string in the form of:

stores:fs:/srv/mywiki/%(backend)s/%(kind)s

stores is the name of the backend, followed by a colon, followed by a store specification. fs is the type of the store, followed by a specification that makes sense for the fs (filesystem) store, i.e. a path with placeholders.

%(backend)s placeholder will be replaced by ‘default’ or ‘userprofiles’ for the respective backend. %(kind)s will be replaced by ‘meta’ or ‘data’ later.

In this case, the mapping created will look like this:

Namespace Filesystem path for storage
default /srv/mywiki/default/
userprofiles /srv/mywiki/userprofiles/

default_acl and userprofiles_acl are dictionaries specifying the ACLs for this part of the namespace (normal content, user profiles). See the docs about ACLs.

protecting middleware

Features:

  • protects access to lower storage layers by ACLs (Access Control Lists)
  • makes sure there won’t be ACL security issues, even if upper layers have bugs
  • if you use create_simple_mapping, you just give the ACL parameters; the middleware will be set up automatically by moin.

routing middleware

Features:

  • dispatches storage access to different backends depending on the namespace
  • if you use create_simple_mapping, the router middleware will be set up automatically by moin.

indexing middleware

Features:

  • maintains an index for important metadata values
  • speeds up looking up / selecting items
  • makes it possible for lower storage layers to be simpler
  • the indexing middleware will be set up automatically by moin.

stores backend

This is a backend that ties together 2 stores to form a backend: one for meta, one for data

fs store

Features:

  • stores into the filesystem
  • store metadata and data into separate files/directories

Configuration:

from MoinMoin.storage import create_simple_mapping

data_dir = '/srv/mywiki/data'
namespace_mapping, acl_mapping = create_simple_mapping(
    uri='stores:fs:{0}/%(nsname)s/%(kind)s'.format(data_dir),
    default_acl=dict(before=u'WikiAdmin:read,write,create,destroy',
                     default=u'All:read,write,create',
                     after=u'', ),
    userprofiles_acl=dict(before=u'WikiAdmin:read,write,create,destroy',
                          default=u'',
                          after=u'', ),
)

sqla store

Features:

  • stores data into an (SQL) database / table
  • can either use 1 database per store or 1 table per store and you need to give different table names then
  • uses slqalchemy (without the ORM) for database abstraction
  • supports multiple types of databases, for example:
    • sqlite (default, comes built-into Python)
    • postgresql
    • mysql
    • and others, see sqlalchemy docs.

uri for create_simple_mapping looks like e.g.:

stores:sqla:sqlite:////srv/mywiki/data/mywiki_%(nsname)s_%(kind).db
stores:sqla:sqlite:////srv/mywiki/data/mywiki_%(nsname)s.db::%(kind)s
stores:sqla:mysql://myuser:mypassword@localhost/mywiki_%(nsname)s::%(kind)s
stores:sqla:postgres://myuser:mypassword@localhost/mywiki_%(nsname)s::%(kind)s

The uri part after “sqla:” is like:

DBURI::TABLENAME

Please see the sqlalchemy docs about the DBURI part.

Grant ‘myuser’ (his password: ‘mypassword’) full access to these databases.

sqlite store

Features:

  • directly talks to sqlite, without using sqlalchemy
  • stores data into an sqlite database, which is a single file
  • can either use 1 database per store or 1 table per store and you need to give different table names then
  • can optionally compress/decompress the data using zlib: default compression level is 0, which means “do not compress”

uri for create_simple_mapping looks like e.g.:

stores:sqlite:/srv/mywiki/data/mywiki_%(nsname)s_%(kind)s.db
stores:sqlite:/srv/mywiki/data/mywiki_%(nsname)s.db::%(kind)s
stores:sqlite:/srv/mywiki/data/mywiki_%(nsname)s.db::%(kind)s::1

The uri part after “sqlite:” is like:

PATH::TABLENAME::COMPRESSION

It uses ”::” as separator to support windows pathes which may have ”:” after the drive letter.

kc store

Features:

  • uses a Kyoto Cabinet file for storage
  • very fast
  • single-process only, local only

uri for create_simple_mapping looks like e.g.:

stores:kc:/srv/mywiki/data/%(nsname)s_%(kind)s.kch

Please see the kyoto cabinet docs about the part after kc:.

If you use kc with the builtin server of moin, you cannot use the reloader. Disable it with the commandline option:

moin moin -r

kt store

Features:

  • uses a Kyoto Tycoon server for storage
  • fast
  • multi-process, local or remote.

mongodb store

Features:

  • uses mongodb for storage

memory store

Features:

  • keeps everything in RAM
  • if your system or the moin process crashes, all data is lost, so definitely not for production use
  • mostly intended for testing
  • single process only

fileserver backend

Features:

  • exposes a part of the filesystem as read-only wiki items
    • files will show up as wiki items
      • with 1 revision
      • with as much metadata as can be made up from the filesystem metadata
    • directories will show up as index items, listing links to their contents
  • might be useful together with SMBMount pseudo-authenticator

namespaces

Moin has support for multiple namespaces. You can configure them as per your need. A sample configuration looks like e.g:

import os

from wikiconfig import *

from MoinMoin.storage import create_mapping
from MoinMoin.constants.namespaces import NAMESPACE_DEFAULT, NAMESPACE_USERPROFILES

class LocalConfig(Config):
    wikiconfig_dir = os.path.abspath(os.path.dirname(__file__))
    instance_dir = os.path.join(wikiconfig_dir, 'wiki')
    data_dir = os.path.join(instance_dir, 'data')

    index_storage = 'FileStorage', (os.path.join(instance_dir, "index"), ), {}

    uri = 'stores:fs:{0}/%(backend)s/%(kind)s'.format(data_dir)
    namespaces = {
        # maps namespace name -> backend name
        # first, configure the required, standard namespaces:
        NAMESPACE_DEFAULT: u'default',
        NAMESPACE_USERPROFILES + '/': u'userprofiles',
        # then some additional custom namespaces:
        u'foo/': u'default',
        u'bar/': u'default',
        u'baz/': u'default',
    }
    backends = {
        # maps backend name -> storage
        u'default': None,
        u'userprofiles': None,
    }
    acls = {
        # maps namespace name -> acl configuration dict for that namespace
        NAMESPACE_USERPROFILES + '/': dict(before=u'',
                                           default=u'All:read,write,create,destroy,admin',
                                           after=u'',
                                           hierarchic=False, ),
        NAMESPACE_DEFAULT: dict(before=u'',
                                default=u'All:read,write,create,destroy,admin',
                                after=u'',
                                hierarchic=False, ),
        u'foo/': dict(before=u'',
                      default=u'All:read,write,create,destroy,admin',
                      after=u'',
                      hierarchic=False, ),
        u'bar/': dict(before=u'',
                      default=u'All:read,write,create,destroy,admin',
                      after=u'',
                      hierarchic=False, ),
        u'baz/': dict(before=u'',
                      default=u'All:read,write,create,destroy,admin',
                      after=u'',
                      hierarchic=False, ),
    }
    namespace_mapping, backend_mapping, acl_mapping = create_mapping(uri, namespaces, backends, acls

    # define mapping of namespaces to item_roots (home pages within namespaces).
    root_mapping = {u'foo': u'fooHome'}
    # default root, use this value in case a particular namespace key is not present in the above mapping.
    default_root = u'Home'

MOINCFG = LocalConfig
DEBUG = True

Mail configuration

Sending E-Mail

Moin can optionally send E-Mail. Possible uses:

  • send out item change notifications
  • enable users to reset forgotten passwords
  • inform admins about runtime exceptions

You need to configure some settings before sending E-Mail can be supported:

# the "from:" address [Unicode]
mail_from = u"wiki <wiki@example.org>"

# a) using an SMTP server, e.g. "mail.provider.com" with optional `:port`
appendix, which defaults to 25 (set None to disable mail)
mail_smarthost = "smtp.example.org"

# if you need to use SMTP AUTH at your mail_smarthost:
#mail_username = "smtp_username"
#mail_password = "smtp_password"

# b) alternatively to using SMTP, you can use the sendmail commandline tool:
#mail_sendmail = "/usr/sbin/sendmail -t -i"

Todo

describe more moin configuration

Admin Traceback E-Mails

If you want to enable admins to receive Python tracebacks, you need to configure the following:

# list of admin emails
admin_emails = [u"admin <admin@example.org>"]

# send tracebacks to admins
email_tracebacks = True

Please also check the logging configuration example in docs/examples/config/logging/email.

User E-Mail Address Verification

At account creation time, Moin can require new users to verify their E-Mail address by clicking a link that is sent to them.

Make sure that Moin is able to send E-Mails (see previous section) and add the following line to your configuration file to enable this feature:

user_email_verification = True

Framework Configuration

Things you may want to configure for Flask and its extensions (see their docs for details):

# for Flask
SECRET_KEY = 'you need to change this so it is really secret'
DEBUG = False # use True for development only, not for public sites!
#TESTING = False
#SESSION_COOKIE_NAME = 'session'
#PERMANENT_SESSION_LIFETIME = timedelta(days=31)
#USE_X_SENDFILE = False
#LOGGER_NAME = 'MoinMoin'

# for Flask-Cache:
#CACHE_TYPE = 'filesystem'
#CACHE_DIR = '/path/to/flask-cache-dir'

Logging configuration

By default, logging is configured to emit output on stderr. This will work well for the built-in server (it will show up on the console) or for Apache2 and similar (logging will be put into error.log).

Logging is very configurable and flexible due to the use of the logging module of the Python standard library.

The configuration file format is described there:

http://www.python.org/doc/current/library/logging.html#configuring-logging

There are also some logging configurations in the docs/examples/config/logging/ directory.

Logging configuration needs to be done very early, usually it will be done from your adaptor script, e.g. moin.wsgi:

from MoinMoin import log
log.load_config('wiki/config/logging/logfile')

You have to fix that path to use a logging configuration matching your needs (use an absolute path).

Please note that the logging configuration has to be a separate file, so don’t try this in your wiki configuration file!

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