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egroupware_official/doc/UCS-SAML-SSO.md

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## Configure EGroupware for SSO via SAML with Univention
### SAML IdP need to be enabled, see [UCS Manual about login](https://docs.software-univention.de/manual/5.0/en/central-management-umc/login.html#central-management-umc-login)
* ```ucs-sso.<domain>``` need to resolve to one or more primary or secondary domain controllers
* if you use LetsEncrypt, you should add the above domain to your certificate
* UCS config registry variable ```portal/auth-mode``` has to be set to ```saml```
* portal server needs to be restarted: ```systemctl restart univention-portal-server.service```
### EGroupware needs to be configured for SAML via Setup (```https://egw.example.org/egroupware/setup/```)
* Login into setup with user ```admin``` and the password from ```/var/lib/egroupware/egroupware-docker-install.log```
* Go to [Edit current configuration]
<html>
<table border="0" align="center" cellspacing="0" width="90%">
<tbody>
<tr class="th">
<td colspan="2"><b>If using SAML 2.0 / Shibboleth / SimpleSAMLphp:</b></td>
</tr>
<tr class="row_off">
<td>Label to display as option on login page:<br>or leave empty and select SAML as authentication type above for single sign on</td>
<td><input name="newsettings[saml_discovery]" placeholder="University Login" value="Test SSO" size="20"></td>
</tr>
<tr class="row_on">
<td>Identity Provider:<br>You can specify multiple IdP on separate lines.</td>
<td><textarea name="newsettings[saml_idp]" placeholder="https://idp.uni-kl.de/idp/shibboleth" rows="3" cols="64">https://ucs.example.org/simplesamlphp/saml2/idp/metadata.php</textarea></td>
</tr>
<tr class="row_off">
<td>
Metadata:
refresh
<select name="newsettings[saml_metadata_refresh]">
<option value="daily">daily</option>
<option value="weekly">weekly</option>
<option value="no">not automatic</option>
<option value="now" selected>just now</option>
</select>
</td>
<td>
<input name="newsettings[saml_metadata]" placeholder="https://www.aai.dfn.de/fileadmin/metadata/dfn-aai-metadata.xml" value="https://ucs.example.org/simplesamlphp/saml2/idp/metadata.php" size="64"><br>
</td>
</tr>
<tr class="row_on">
<td>Certificate Metadata is signed with: (Will be downloaded once, unless changed.)</td>
<td><input name="newsettings[saml_certificate]" placeholder="https://www.aai.dfn.de/fileadmin/metadata/dfn-aai.pem" value="https://ucs.example.org/simplesamlphp/saml2/idp/certificate" size="64"></td>
</tr>
<tr class="row_off">
<td>Result data to use as username:</td>
<td>
<select name="newsettings[saml_username]">
<option value="eduPersonPrincipalName">eduPersonPrincipalName</option>
<option value="eduPersonUniqueId">eduPersonUniqueId</option>
<option value="emailAddress">emailAddress</option>
<option value="uid" selected="">uid</option>
<option value="customOid">custom OID</option>
</select>
<input name="newsettings[saml_username_oid]" value="" placeholder="urn:oid:x.x.x.x" size="40">
</td>
</tr>
<tr class="row_on">
<td>Result data to add or remove extra membership:</td>
<td>
<select name="newsettings[saml_affiliation]">
<option value="eduPersonAffiliation" selected="">eduPersonAffiliation</option>
<option value="custom">custom OID</option>
</select>
<input name="newsettings[saml_affiliation_oid]" value="" placeholder="urn:oid:x.x.x.x" size="40">
</td>
</tr>
<tr class="row_off">
<td>Result values (comma-separated) and group-name to add or remove:</td>
<td>
<input name="newsettings[saml_affiliation_values]" value="" placeholder="staff, ..." size="30">
<input name="newsettings[saml_affiliation_group]" value="" placeholder="Teachers" size="30">
</td>
</tr>
<tr class="row_on">
<td>Allow SAML logins to join existing accounts:<br>(Requires SAML optional on login page and user to specify username and password)</td>
<td>
<select name="newsettings[saml_join]">
<option value="">No</option>
<option value="usernameemail">Replace username and email</option>
<option value="username">Replace username and keep email</option>
<option value="description">Use account description to store SAML username</option>
</select>
</td>
</tr>
<tr class="row_off">
<td>Match SAML usernames to existing ones (use strings or regular expression):</td>
<td>
<input name="newsettings[saml_replace]" placeholder="replace: '@uni-kl.de' or '/@(uni-kl\.de)$/'" value="" size="40">
<input name="newsettings[saml_replace_with]" placeholder="with: '@rhrk.uni-kl.de' or '@rhrk.$1'" value="" size="35">
</td>
</tr>
<tr class="row_on" height="25">
<td>Some information for the own Service Provider metadata:</td>
<td><a href="/egroupware/saml/module.php/saml/sp/metadata.php/default-sp">Metadata URL</a></td>
</tr>
<tr class="row_off">
<td>Name for Service Provider:</td>
<td><input name="newsettings[saml_sp]" placeholder="EGroupware" value="EGroupware" size="40"></td>
</tr>
<tr class="row_on">
<td>Technical contact:</td>
<td>
<input name="newsettings[saml_contact_name]" value="Ralf Becker" placeholder="Name" size="24">
<input name="newsettings[saml_contact_email]" value="rb@egroupware.org" placeholder="Email" size="24">
</td>
</tr>
</tbody></table>
</html>
> For Univention the Metadata-URL is also the ID of the IdP!
### Configure EGroupware as service-provide in your UCS domain: **Domain > LDAP directory > SAML service provider**
* Add: Type: SAML service provider
```
X Service provider activation status
Service provider identifier: https://egw.example.org/egroupware/saml/module.php/saml/sp/metadata.php/default-sp
Respond to this service provider URL after login: https://egw.example.org/egroupware/saml/module.php/saml/sp/saml2-acs.php/default-sp
Single logout URL for this service provider: https://egw.example.org/egroupware/saml/module.php/saml/sp/saml2-logout.php/default-sp
Format of NameID attribute:
Name of the attribute that is used as NameID: uid
Name of the organization for this service provider: EGroupware
Description of this service provider:
X Enable signed Logouts
```
* After saving the above, you have to edit the `Extended Settings` of your new Service Provide
```
X Allow transfering LDAP attributes to the Service Provider
LDAP Attribute Name: uid
LDAP Attribute Name: mailPrimaryAddress
LDAP Attribute Name: givenName
LDAP Attribute Name: sn
```
* Some useful links
* [How does Single Sign-on work?](https://www.univention.com/blog-en/2021/08/how-does-single-sign-on-work-with-saml-and-openidconnect/)
* [Reconfigure UCS Single Sign On](https://help.univention.com/t/reconfigure-ucs-single-sign-on/16161)
* [Create an SSO Login for Applications to Groups](https://www.univention.com/blog-en/2020/07/sso-login-for-groups/)
* [Adding a new external service provider](https://docs.software-univention.de/manual/5.0/en/domain-ldap/saml.html#domain-saml-additional-serviceprovider)
### Configure EMail access without password
> EGroupware normally use the session password to authenticate with the mail-server / Dovecot. If you use SSO (single sign on), EGroupware does not know your password and therefore can not pass it to the mail server.
* login via ssh as user root to your mailserver
* note the password from /etc/dovecot/master-users (secretpassword in the example below)
```
dovecotadmin:{PLAIN}secretpassword::::::
```
* add the following line to your /etc/dovecot/global-acls
```shell
echo "* user=dovecotadmin lra" >> /etc/dovecot/global-acls
doveadm reload
```
* login with a user that has EGroupware admin rights
* go to **Administration**, right-click on a user and select **mail-account**
* in IMAP tab fill in the credentials:
```
Admin user: dovecotadmin
Password: secretpassword
X Use admin credentials to connect without a session-password, e.g. for SSO
```
* log out and in again with SSO and check everything works
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