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<title>web2ldap - FAQ</title>
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<hgroup>
<h1>
FAQ
</h1>
<h2>
Frequently Asked Questions
</h2>
</hgroup>
</header>
<h2>Installation</h2>
<dl>
<dt>
<var>SyntaxError:</var> ...
</dt>
<dd>
You are probably running a wrong Python version or the configuration module
is screwed up.<br>
See <a href="install.html#Prerequisites">required software</a>
before starting web2ldap.
</dd>
<dt>
<var>ImportError: No module named...</var>
</dt>
<dd>
A required module was not found.
Install all <a href="install.html#Prerequisites">required software</a>
before starting web2ldap. You can check with the script <var>sbin/checkinst.py</var>
whether all needed software is installed.
</dd>
<dt>
I've installed some packages coming with my <var>favourite Linux
distribution</var> and get strange errors with...
</dt>
<dd>
Please check whether packages coming with your distribution
match the <em>version</em> of <a href="install.html#Prerequisites">
required software</a> before starting web2ldap.
</dd>
<dt>
I have started web2ldap in stand-alone mode. It runs and accessing it
from localhost works but I cannot access it over my network.
What is wrong?
</dt>
<dd>
<p>
For security reasons web2ldap does not bind to every interface
in your system as default like other network demons do. You have
to explicitly bind to a specific network interface by using
command line option -l.<br>
<kbd>
web2ldap -l my.public.ether.addr:port
</kbd></p>
You can enable binding to all interfaces by
<p><kbd>
web2ldap -l 0.0.0.0:port
</kbd>
</p>
<p>
Since <a href="changes.html#0.11.20">web2ldap 0.11.20</a> there is
a stand-alone configuration option
<a href="web2ldapcnf_standalone.html#bind_address">
web2ldapcnf.standalone.bind_address</a> for this purpose.
</p>
<p>
Also watch out for stand-alone configuration option
<a href="web2ldapcnf_standalone.html#access_allowed">
web2ldapcnf.standalone.access_allowed</a> which limits the client's
IP addresses allowed to access the built-in web server.
</p>
</dd>
<dt>
Is it possible to run web2ldap under Windows (Win32)?
</dt>
<dd>
Yes. You have to grab a Win32 build of
<a href="http://www.python-ldap.org/download.shtml">
python-ldap</a>.
</dd>
<dt>
<code>NameError: global name 'threading' is not defined</code>
</dt>
<dd>
Your Python interpreter seems to have thread support disabled.
You can solve that by building Python with <code>configure
--with-threads</code>.
</dd>
<dt>
I experience problems with session hijacking detection when
accessing web2ldap through a web proxy or using HTTPS.
</dt>
<dd>
Check out configuration parameter
<a href="web2ldapcnf_misc.html#session_checkvars">web2ldapcnf.misc.session_checkvars</a>
and especially read the note about <var>REMOTE_ADDR</var> and <var>REMOTE_HOST</var>.
Also if using HTTPS check whether SSL session caching is correctly configured
for your web server because <var>SSL_SESSION_ID</var> is also cross-checked.
</dd>
</dl>
<h2>Customizing</h2>
<p>
See also extra page <a href="usability.html">customizing UI</a>.
</p>
<dl>
<dt>
I want to avoid displaying the raw DNs in the search
result table. How to do that?
</dt>
<dd>
There are several possibilities:
<ul>
<li>
Use configuration parameter
<a href="web2ldapcnf_hosts.html#search_tablistattrs">search_tablistattrs</a>.
</li>
<li>
Use configuration parameter
<a href="web2ldapcnf_hosts.html#search_tdtemplate">search_tdtemplate</a>.
</li>
<li>
Add the attribute <var>displayName</var> to your LDAP entry if
appropriate in your schema (e.g. in object class <var>inetOrgPerson</var>).
</li>
</ul>
</dd>
<dt>
I would like to setup some automatically filled fields. E.g.
automatically set the <em>cn</em> (common name) attribute with
the concatenation of values of the attributes
<em>givenName</em> and <em>sn</em> (surname).
</dt>
<dd>
<p>There are two ways of achieving something like this:</p>
<ul>
<li>
Use LDIF templates for defining defaults for attributes when
adding new entries (see host-/backend-specific paramter
<a href="web2ldapcnf_hosts.html#addform_entry_templates">addform_entry_templates</a>).
</li>
<li>
Implement a <a href="usability.html#plugin_classes">plug-in class</a>
for the attribute type.
</li>
</ul>
</dd>
<dt>
I would like to define a "select" item for certain input fields.
</dt>
<dd>
This can be easily done by defining a plug-in class based on
base class <var>w2lapp.schema.syntaxes.SelectList</var>
and register it as a LDAP syntax handler or explicitly for an attribute type.
A simple example can be found in file
<var>pylib/w2lapp/schema/plugins/msperson.py</var>.
In some cases the select list can also be defined based
on LDAP URLs specifying a dynamic result set used for select options.
</dd>
<dt>
How to customize the HTML output to use different colors,
different font size, etc.?
</dt>
<dd>
Customization of layout can be done by defining a CSS file
(<a href="http://www.w3.org/Style/CSS/">cascaded
style sheet</a>). Almost all important HTML elements have own
<em>id</em> or <em>class</em> attributes which can be used to
define their appearance.
Have a look at the example CSS files shipped with the source
distribution package.
</dd>
</dl>
<h2>User Interface</h2>
<dl>
<dt>
I would like to upload a photo, a certificate or other binary
attribute data. Is that possible?
</dt>
<dd>
Yes. But up to now only a single value is supported per attribute.
Uploading multiple binary attribute values is currently only possible
via LDIF when adding or modifying an entry.
You have to convert your binary data with a LDIF tool first
and cut&paste its output into the LDIF input field
or provide a URL in the LDIF line (see global configuration
parameter
<a href="web2ldapcnf_misc.html#ldif_url_schemes">
web2ldapcnf.misc.ldif_url_schemes</a>).
</dd>
<dt>
I would like to delete a photo, a certificate or other binary
attribute data. Is that possible?
</dt>
<dd>
Yes, it is possible since
<a href="changes.html#0.10.0">version 0.10.0</a>.
An addtional [Delete] link is shown for binary attributes. Note
that in case of multi-valued attributes all attribute
values are deleted. You cannot delete a single chosen
attribute value.
</dd>
</dl>
<h2>Integration</h2>
<dl>
<dt>
I want to refer to the web2ldap gateway from a web page.
Is there a way to get a persistent URL?
</dt>
<dd>
Yes, you can use any RFC4516-compliant LDAP URL as query string.
The safest way is to use the URL-encoded scheme.<br>
Example:<br>
<code>
http://demo.web2ldap.de:1760/web2ldap?ldap://ldap.openldap.org/dc=openldap,dc=org
</code>
<br>
The <a href="demo.html#examples">specific examples</a> on the demo page
might give you some more ideas.
</dd>
<dt>
Is there some way of nifty browser integration?
</dt>
<dd>
Yes, check out the directory htdocs/sidebars or the
<a href="demo.html#sidebars">demo sidebar</a>
which contains HTML examples for using side-bars of modern browsers
(Mozilla, Opera) as entry point. Make sure to use LDAP URLs!
With Mozilla you can also use
<a href="http://www.mozilla.org/docs/end-user/keywords.html">
Custom Keywords</a>.
</dd>
<dt>
Is Kerberos-based authentication supported?
</dt>
<dd>
Yes. python-ldap has to been built with SASL/GSSAPI support (see also
<a href="http://www.python-ldap.org/doc/html/installing.html#building-and-installing">
python-ldap's installation instructions</a>)
and web2ldap has to be started in stand-alone mode by the end-user to use his/her
ticket granting ticket (TGT).
</dd>
</dl>
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