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This is probably my longest standing action item in TERENA TERENA : implement a federated version of the Atlassian Confluence wiki.

Below is the recipe for getting this to work with Ubuntu 12with Ubuntu 14.04, Confluence Confluence 5.1, Apache, and modmellon6, Apache 2.4, and mod_auth_mellon.

I choose modmellon mod_auth_mellon because it seemed like a cleaner solution than mod_shib, requiring no additional daemons and much simpler configuration.

The wiki will be open to the public, and logins will only be federatedwith only SAML logins (i.e. no local accounts). New users will have their account automatically created, and are put in the confluence-users group.

Table of Contents

Prerequisites

Before you start, make sure you have these bits:

A correctly configured apache web server that is able to serve an HTTPS web site (https://example.com).
A SAML Identity Provider (IdP).
An account on that IdP.
An An attribute that can be used as username in Confluence (for example eduPersonPrincipalName). Attributes for full name and e-mail are optional but recommended. In this case we assume 'mail' and 'displayName' can be used.
The user name of the to-be administrator account. So, if you choose eduPersonPrincipalName choose eduPersonPrincipalName as the attribute for username, you need to know your own value (for instance 'dvisser@surfnetdvisser@surfnet.nl').

PostgreSQL

Code Block
apt-get install postgresql

...

Code Block
sudo su - postgres createuser -S -d -r -P -E confuser createdb -O confuser confluence

Confluence - part 1

This is a default install of Confluence, which has only local account and no federated logins - that comes later in part 2.

...

Code Block
apt-get --no-install-recommends install openjdk-7-jdk

Download the source http://www.atlassian.com/software/confluence/downloads/binary/atlassian-confluence-5.6.13.tar.gz and unpack it to /opt/confluence. All relative paths mentioned below are relative to this directory.

Create a home directory for Confluence (/home/confluence).

Edit confluence/WEB-INF/classes/confluence-init.properties and configure confluence.home=/home/confluence.

Upstart script for Confluence

Ubuntu uses the new upstart init scripts, which we should use.

Create the upstart script /etc/init/confluence.conf:

Code Block

theme	Midnight
language	bash

# Upstart script for confluence
description     "Atlassian Confluence"
start on runlevel [2345]
stop on runlevel [!2345]
kill timeout 30
env RUN_AS_USER=root
env BASEDIR=/opt/confluence
script
    LOGFILE=$BASEDIR/logs/catalina.out
    exec su - $RUN_AS_USER -c "$BASEDIR/bin/catalina.sh run" >> $LOGFILE 2>&1
end script

Once this script is here, issue "start confluence" to get going, and watch the log file file /opt/confluence/log/catalina.out. After some time you should see something like this:

...

By this time you can point your browser to http://example.com:8090, and it should come up with a configuration wizzard that configuration wizard that will ask for a license key, database credentials, a local admin account, etc. Once that is all done, things should be working, but nothing federated yet, only local accounts.

Make sure that anonymous users can look at the content. Go to https://example.com/admin/permissions/globalpermissions.action

At this point you need to do some preparation so that stuff will work properly later on through Apache:

Create a new admin account with the correct federated username. For instance, if you have decided on using eduPersonPrincipalName as the username, and the value of that attribute for your federated account is 'dvisser@surfnetdvisser@surfnet.nl', create an account with that exactly that username. Obviously, Confluence username can
Make sure this newly created account is a member of "confluence-administrators".
Configure the Server Base Url to to be the (HTTPS) URL that Apache will listen to. This is done in Confluence Admin -> General Configuration -> Edit.
Configure the global permissions to allow anonymous use (https://example.com/admin/permissions/globalpermissions.action).

Once this is complete, shut down Confluence by issuing "stop confluence".

Modmellon

mod_auth_mellon

mod_auth_mellon Modmellon is an Apache module. To get this working Ubuntu 14.04 and later contain the correct package. To get things working for Ubuntu 12.04 I recompiled the Debian source packages from the University of Tilburg for Ubuntu 12.04 and and made them available in our own own APT repository.

The Once that is done, the needed packages can be installed like:

Code Block
apt-get install libapache2-mod-auth-mellon apache2 # other needed modules a2enmod proxy proxy_http auth_mellon rewrite ssl headers

Create a directory directory /etc/apache/mellon, and store the Identity Provider metadata in XML format to a file called called idp.xml.

Create the cryptographic material for the mellon SP:

Code Block
openssl req -new -newkey rsa:20484096 -days 3650 -nodes -x509 -keyout sp.key -out sp.crt

Now add this to the configuration of the vhost (note that this is not the entire config - you should have the HTTPS stuff etc already configured):

Code Block

theme	RDark
language	erl

ServerName example.com
 
ProxyRequests Off
<Proxy http://ip6-localhost:8090>
    Require    Order deny,allow
        Allow from allAll Granted
</Proxy>


ProxyPass /mellon/ !
ProxyPass / http://ip6-localhost:8090/
ProxyPassReverse / http://ip6-localhost:8090/


# Mobile theme does not honour new seraph values for login URL, so we have to redirect that
RewriteEngine on
RewriteCond     %{QUERY_STRING} ^originalUrl=(.*)$      [NC]
Rewriterule     ^/plugins/servlet/mobile/login          /mellon/login?ReturnTo=%1 [R,NE]

# After upgrading to 5.6 the mobile login links were changed. 
# New redirects needed:
RewriteCond     %{QUERY_STRING} ^os_destination=%2Fplugins%2Fservlet%2Fmobile%3F%23content%2Fview%2F(.*)$ [NC]
RewriteRule     ^/login.action  /mellon/login?ReturnTo=/pages/viewpage.action?pageId=%1 [R,NE]


# Remove the jsessionid from the URL, to prevent 404 errors when
# unauthenticated visitors try to access a protected resource.
ReWriteRule     ^(.*);jsessionid=[A-Za-z0-9]+(.*)$ $1$2 [R,NE]


<Location />
        MellonEnable "info"
        MellonSecureCookie On
        MellonSessionDump Off
        MellonUser "eduPersonPrincipalName"
        MellonSamlResponseDump Off
        MellonEndpointPath "/mellon"
        MellonSPPrivateKeyFile /etc/apache2/mellon/sp.key
        MellonSPCertFile /etc/apache2/mellon/sp.crt
        MellonIdPMetadataFile /etc/apache2/mellon/idp.xml

        # First unset to avoid security holes
        RequestHeader unset REMOTECONF_FULL_USERNAME
        RequestHeader set REMOTECONF_FULL_USERNAME "%{MELLON_usernamedisplayName}e" env=MELLON_usernamedisplayName

        RequestHeader unset FULLNAMECONF_EMAIL
        RequestHeader set FULLNAME "%{MELLON_fullname}e" env=MELLON_fullname

        RequestHeader unset MAIL
        RequestHeader set MAIL CONF_EMAIL "%{MELLON_emailmail}e" env=MELLON_emailmail
</Location>

By this time, you should be able to download the Service Provider metadata from from https://example.com/mellon/metadata, and use it to add it to your IdP, thereby creating a trust relationship.

And once Once that is done, you should be able to use federated authentication by going to https://example.com/mellon/login?ReturnTo=/%2F

Confluence - part 2

Now everything is in place to federate Confluence. Make sure that Confluence isn't running any more.

Download the right version of remoteUserAuth.jar from jar (I used 2.5.0) from https://github.com/chauth/confluence_http_authenticator/tree/master/releases, and store it in in confluence/WEB-INF/lib. Make sure you're actually downloading the JAR file and not the HTML page.
Download Download https://github.com/chauth/confluence_http_authenticator/blob/master/conf/remoteUserAuthenticator.properties and save it as as confluence/WEB-INF/classes/remoteUserAuthenticator.properties. Edit it to suit your needsThe defaults were almost OK, the only thing I needed to change was convert.to.utf8=true.

Edit confluence/WEB-INF/classes/serapthseraph-config.xml and change this section in the beginning and change these values:

Code Block

language	html/xml

       <init-param>
            <param-name>login.url</param-name>
            <param-value>/login.action?os_destination=${originalurl}</param-value>
        </init-param>
        <init-param>
            <param-name>link.login.url</param-name>
            <param-value>/login.action</param-value>
        </init-param>

To thisthese:

Code Block

language	html/xml

        <init-param>
            <param-name>login.url</param-name>
            <param-value>/mellon/login?ReturnTo=${originalurl}</param-value>
        </init-param>
        <init-param>
            <param-name>link.login.url</param-name>
            <param-value>/mellon/login?ReturnTo=%2Fdashboard.action<${originalurl}</param-value>
        </init-param>

Also, change the authenticator from this:

Code Block
<authenticator class="com.atlassian.confluence.user.ConfluenceAuthenticator"/>

to this:

Code Block
<authenticator class="shibauth.confluence.authentication.shibboleth.RemoteUserAuthenticator"/>

You should now be able to use federated logins.

If for some reason your account isn't an administrator, there is no way to fix this. You should disable the changes from step 3 and restart Confluence so that it doesn't use federated authentication any more. Then go back in and fix the permissions, then change back.

Confluence - mobile theme

The new Confluence feature a dedicated theme for use on mobile devices. This is great, but unfortunately both the login and logout buttons in that theme do not work - they still point to the 'old' static login/logout links.

Login button

I couldn't find any way to do this in Confluence, so I ended up rewriting it in Apache. See the snippet in the Apache config above.

Logout button & Invitation link

The logout button link can be configured in Confluence, but the configuration file is located inside a JAR file (Java ARchive), so it's a little bit of work.

You need to extract the JAR and copy/edit an XML file to WEB-INF/classes - see https://confluence.atlassian.com/confkb/how-to-edit-files-in-confluence-jar-files-103711179.html.

Then do:

mkdir /tmp/jar
unzip /opt/confluence/confluence/WEB-INF/lib/confluence-5.5.3.jar -d /tmp/jar

Now /tmp/jar should contain the contents of the jar. Copy the file xwork.xml to /opt/confluence/confluence/WEB-INF/classes and change this part:

Code Block

language	html/xml

        <action name="logout" class="com.atlassian.confluence.user.actions.LogoutAction">
            <interceptor-ref name="defaultStack"/>
            <result name="error" type="velocity">/logout.vm</result>
            <result name="success" type="redirect">/login.action?logout=true</result>
        </action>

to this:

Code Block

language	html/xml

        <action name="logout" class="com.atlassian.confluence.user.actions.LogoutAction">
            <interceptor-ref name="defaultStack"/>
            <result name="error" type="velocity">/logout.vm</result>
            <result name="success" type="redirect">/mellon/logout?ReturnTo=%2Fdashboard.action</result>
        </action>

While you're at it, you can also change the Invite Users link on /admin/users/browseusers.action. This will take you a non-federated invitation page, which is not what you want. If your Confluence admins don't know how they should add people (by asking new users to simply log in), then chances are that they will use this option, ending up with a 'wrong' account.

Copy plugins/user-management.xml to /opt/confluence/confluence/WEB-INF/classes/plugins/ (you have to create the plugins dir) and change this line:

Code Block
<link linkId="invite-tab-link">/admin/users/inviteuser.action</link>

so that it points to a custom page that you created with the proper instructions.

The page I'm using has a clickable mailto link so that everything is precooked.

Restart Confluence. You should now also be able to use federated logins on your iPad/etc.

jsessionid errors

If unauthenticated users try to access content that is protected, Confluence tries to set jsessionid as part of the URL. This leads to 404 errors like this:

Code Block
NOT FOUND The requested URL /mellon/login;jsessionid=8A736F43779F96249F6C3DC41067BB98 was not found on this server.

Since the jsessionid part isn't needed, it can be removed uses a rewrite statement (see apache config above).

Logging

You might want to change the default apache log file configuration to include the federated user name. While you're at it, add milliseconds to the timestamp, and change it to something that is not a nightmare to sort later on:

Code Block

#LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
# Sortable log format, with proper federated username. DV 2016-04-05
LogFormat "%v:%p %{%F %T}t.%{msec_frac}t %h %{MELLON_CONF_USER}e \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined

This will yield useful stuff like:

Code Block

wiki.geant.org:443 2016-04-05 14:23:10.714 2001:610:148:dead:49be:5225:a8a0:4b1f federated-user-3 "GET /rest/mywork/latest/status/notification/count HTTP/1.1" 200 944 "https://wiki.geant.org/dashboard.action" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36"

Limit access to the unprotected TCP port

Confluence by default listens to TCP port 8090 on all interface. Since Apache will be the internet facing application, there is no need for Confluence to listen on all interfaces. Even worse, if you do let it listen on the internet then it is trivial to add a REMOTE_USER header and spoof any account. Of course it is good practice to use a firewall to protect this port, but you can limit this in Confluence as well. Since Apache is configured to only connect to the (IPv6) localhost address, this is what you should configure Confluence to use as listening address. As per Tomcat docs, you should add an "address" attribute to the Connector, which is located in conf/server.xml:

<Connector className="org.apache.coyote.tomcat4.CoyoteConnector" port="8090" address="::1" minProcessors="5"

Space shortcuts

Child pages

Versions Compared

Old Version 6

New Version Current

Key

Prerequisites

PostgreSQL

Upstart script for Confluence

mod_auth_mellon

Confluence - part 2

Confluence - mobile theme

Login button

Logout button & Invitation link

jsessionid errors

Logging

Limit access to the unprotected TCP port

Space shortcuts

Child pages

Page History

Versions Compared

Old Version 6

New Version Current

Key

Prerequisites

PostgreSQL

Upstart script for Confluence

mod_auth_mellon

Confluence - part 2

Confluence - mobile theme

Login button

Logout button & Invitation link

jsessionid errors

Logging

Limit access to the unprotected TCP port