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* SAML/Univention: support for Univention SAML IdP for SSO incl. docu

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This commit is contained in:
ralf 2022-08-04 20:10:23 +02:00
parent 7bcfdbfa5e
commit 3c4b03ca3c
4 changed files with 268 additions and 14 deletions
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99
api/src/Auth/Saml.php
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@ -38,10 +38,22 @@ use EGroupware\Api\Exception;
* There are basically three possible scenarios currently supported: * There are basically three possible scenarios currently supported:
* a) a single IdP and SAML configured as authentication method * a) a single IdP and SAML configured as authentication method
* --> gives full SSO (login page is never displayed, it directly redirects to the IdP) * --> gives full SSO (login page is never displayed, it directly redirects to the IdP)
* b) one or multiple IdP, a discovery label and an other authentication type eg. SQL configured * b) one or multiple IdP, a discovery label and another authentication type eg. SQL configured
* --> uses the login page for local accounts plus a button or selectbox (depending on number of IdPs) to start SAML login * --> uses the login page for local accounts plus a button or selectbox (depending on number of IdPs) to start SAML login
* c) multiple IdP and SAML configured as authentication method * c) multiple IdP and SAML configured as authentication method
* --> SimpleSAML discovery/selection page with a checkbox to remember the selection (SSO after first selection) * --> SimpleSAML discovery/selection page with a checkbox to remember the selection (SSO after first selection)
*
* EGroupware understands assertions / attributes send after authentication in the following ways:
* - as "urn:uuid:<oid>" uri as used eg. in the DFN federation
* - as LDAP attribute name send eg. by Univention IdP (either lower cased or in matching camelCase)
*
* SAML support in EGroupware automatically downgrades session cookies to SameSite=Lax, as our default SameSite=Strict
* does NOT work with SAML redirects from an IdP in a different domain (browser simply ignores the session cookies)!
*
* Please note: the following SimpleSAMLphp WARNING can be safely ignored (as EGroupware shares the session with it):
* There is already a PHP session with the same name as SimpleSAMLphp's session, or the
* 'session.phpsession.cookiename' configuration option is not set. Make sure to set SimpleSAMLphp's cookie name
* with a value not used by any other applications.
*/ */
class Saml implements BackendSSO class Saml implements BackendSSO
{ {
@ -124,7 +136,10 @@ class Saml implements BackendSSO
// get attributes for (automatic) account creation // get attributes for (automatic) account creation
$attrs = $as->getAttributes(); $attrs = $as->getAttributes();
$username = $attrs[self::usernameOid()][0]; if (!$attrs || empty($username = self::samlAttr(null, $attrs)))
{
throw new \Exception('Got NO '.(!$attrs ? 'attributes' : 'username attribute').' from SAML: '.json_encode($attrs));
}
// check if user already exists // check if user already exists
if (!$GLOBALS['egw']->accounts->name2id($username, 'account_lid', 'u')) if (!$GLOBALS['egw']->accounts->name2id($username, 'account_lid', 'u'))
@ -142,9 +157,9 @@ class Saml implements BackendSSO
return null; return null;
} }
$GLOBALS['auto_create_acct'] = [ $GLOBALS['auto_create_acct'] = [
'firstname' => $attrs[self::firstName][0], 'firstname' => self::samlAttr(self::firstName, $attrs),
'lastname' => $attrs[self::lastName][0], 'lastname' => self::samlAttr(self::lastName, $attrs),
'email' => $attrs[self::emailAddress][0], 'email' => self::samlAttr(self::emailAddress, $attrs),
]; ];
} }
} }
@ -152,6 +167,12 @@ class Saml implements BackendSSO
// check affiliation / group to add or remove // check affiliation / group to add or remove
self::checkAffiliation($username, $attrs, $GLOBALS['auto_create_acct']); self::checkAffiliation($username, $attrs, $GLOBALS['auto_create_acct']);
// Set SameSite attribute for cookies, as SAML redirect does NOT work with samesite=Strict,
// it requires as least Lax, otherwise the browser will ignore the session cookies set in Session::create()!
if ($GLOBALS['egw_info']['server']['cookie_samesite_attribute'] === 'Strict')
{
$GLOBALS['egw_info']['server']['cookie_samesite_attribute'] = 'Lax';
}
// return user session // return user session
return $GLOBALS['egw']->session->create($username, null, null, false, false); return $GLOBALS['egw']->session->create($username, null, null, false, false);
} }
@ -207,17 +228,17 @@ class Saml implements BackendSSO
switch($GLOBALS['egw_info']['server']['saml_join']) switch($GLOBALS['egw_info']['server']['saml_join'])
{ {
case 'usernameemail': case 'usernameemail':
if (!empty($attrs[self::emailAddress])) if (!empty(self::samlAttr(self::emailAddress, $attrs)))
{ {
unset($update['account_email']); // force email update unset($update['account_email']); // force email update
} }
// fall through // fall through
case 'username': case 'username':
$update['account_lid'] = $attrs[self::usernameOid()][0]; $update['account_lid'] = self::samlAttr(null, $attrs);
break; break;
case 'description': case 'description':
$update['account_description'] = $attrs[self::usernameOid()][0]; $update['account_description'] = self::samlAttr(null, $attrs);
break; break;
} }
// update other attributes // update other attributes
@ -227,9 +248,9 @@ class Saml implements BackendSSO
'account_lastname' => self::lastName, 'account_lastname' => self::lastName,
] as $name => $oid) ] as $name => $oid)
{ {
if (!empty($attrs[$oid]) && ($name !== 'account_email' || empty($update['account_email']))) if (!empty($value = self::samlAttr($oid, $attrs)) && ($name !== 'account_email' || empty($update['account_email'])))
{ {
$update[$name] = $attrs[$oid][0]; $update[$name] = $value;
} }
} }
// update account if necessary // update account if necessary
@ -570,6 +591,60 @@ class Saml implements BackendSSO
return self::emailAddress; return self::emailAddress;
} }
/**
* Get SAML attribute by name, taking into account that some IdP, like eg. Univention, use not the oid but the LDAP name
*
* @param string $name attribute name or null for the configured username
* @param array $attrs as returned by SimpleSAML\Auth\Simple::getAttributes()
* @param ?array $config default use config from $GLOBALS['egw_info']['server']
* @return string[]|string|null
*/
private static function samlAttr($name, array $attrs, array $config=null)
{
if (!isset($config)) $config = $GLOBALS['egw_info']['server'];
switch($name ?: $config['saml_username'] ?? 'emailAddress')
{
case 'emailAddress':
case 'mailPrimaryAddress':
case self::emailAddress:
$keys = [self::emailAddress, 'emailAddress', 'mailPrimaryAddress'];
break;
case 'eduPersonPrincipalName':
case self::eduPersonPricipalName:
$keys = [self::eduPersonPricipalName, 'eduPersonPrincipalName'];
break;
case 'eduPersonUniqueId':
case self::eduPersonUniqueId:
$keys = [self::eduPersonUniqueId, 'eduPersonUniqueId'];
break;
case 'uid':
case self::uid:
$keys = [self::uid, 'uid'];
break;
case 'sn':
case 'surname':
case self::lastName:
$keys = [self::lastName, 'sn', 'surname'];
break;
case 'givenName':
case self::firstName:
$keys = [self::firstName, 'givenName'];
break;
case 'customOid':
$keys = ['urn:oid:'.$config['saml_username_oid'], $config['saml_username_oid']];
break;
}
foreach($keys as $key)
{
if (isset($attrs[$key]) || isset($attrs[$key = strtolower($key)]))
{
return count($attrs[$key]) === 1 ? current($attrs[$key]) : $attrs[$key];
}
}
return null;
}
/** /**
* eduPersonAffiliation attribute * eduPersonAffiliation attribute
*/ */
@ -589,7 +664,7 @@ class Saml implements BackendSSO
// check if affiliation is configured and attribute returned by IdP // check if affiliation is configured and attribute returned by IdP
$attr = $config['saml_affiliation'] === 'eduPersonAffiliation' ? self::eduPersonAffiliation : $config['saml_affiliation_oid']; $attr = $config['saml_affiliation'] === 'eduPersonAffiliation' ? self::eduPersonAffiliation : $config['saml_affiliation_oid'];
if (!empty($attr) && !empty($attrs[$attr]) && !empty($config['saml_affiliation_group']) && !empty($config['saml_affiliation_values']) && if (!empty($attr) && !empty($affiliation = self::samlAttr($attr, $attrs)) && !empty($config['saml_affiliation_group']) && !empty($config['saml_affiliation_values']) &&
($gid = $GLOBALS['egw']->accounts->name2id($config['saml_affiliation_group'], 'account_lid', 'g'))) ($gid = $GLOBALS['egw']->accounts->name2id($config['saml_affiliation_group'], 'account_lid', 'g')))
{ {
if (!isset($auto_create_acct) && ($accout_id = $GLOBALS['egw']->accounts->name2id($username, 'account_lid', 'u'))) if (!isset($auto_create_acct) && ($accout_id = $GLOBALS['egw']->accounts->name2id($username, 'account_lid', 'u')))
@ -597,7 +672,7 @@ class Saml implements BackendSSO
$memberships = $GLOBALS['egw']->accounts->memberships($accout_id, true); $memberships = $GLOBALS['egw']->accounts->memberships($accout_id, true);
} }
// check if attribute matches given values to add the extra membership // check if attribute matches given values to add the extra membership
if (array_intersect($attrs[$attr], preg_split('/, */', $config['saml_affiliation_values']))) if (array_intersect($affiliation, preg_split('/, */', $config['saml_affiliation_values'])))
{ {
if (isset($auto_create_acct)) if (isset($auto_create_acct))
{ {

2
api/src/Framework.php
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@ -254,7 +254,7 @@ abstract class Framework extends Framework\Extra
// run egw destructor now explicit, in case a (notification) email is send via Egw::on_shutdown(), // run egw destructor now explicit, in case a (notification) email is send via Egw::on_shutdown(),
// as stream-wrappers used by Horde Smtp fail when PHP is already in destruction // as stream-wrappers used by Horde Smtp fail when PHP is already in destruction
$GLOBALS['egw']->__destruct(); if (isset($GLOBALS['egw'])) $GLOBALS['egw']->__destruct();
exit; exit;
} }

169
doc/UCS-SAML-SSO.md Normal file
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@ -0,0 +1,169 @@
## 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

12
saml/module.php
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@ -7,4 +7,14 @@
require_once('_include.php'); require_once('_include.php');
\SimpleSAML\Module::process()->send(); try {
\SimpleSAML\Module::process()->send();
}
catch(\SimpleSAML\Error\NoState $e) {
// fix/hack NOSTATE error caused by EGroupware and therefore SimpleSAMLphp session lost due logout
if (strpos($_SERVER['PHP_SELF'], '/saml/module.php/saml/sp/saml2-logout.php/default-sp') !== false)
{
\EGroupware\Api\Egw::redirect(str_replace('/saml/module.php/saml/sp/saml2-logout.php/default-sp', '/logout.php', $_SERVER['PHP_SELF']));
}
throw $e;
}