External user authentication
Authenticate user login against IMAP, SMB, FTP, WebDAV, HTTP BasicAuth, SSH and XMPP
Passwords are not stored locally; authentication always happens against the remote server.
It stores users and their display name in its own database table
users_external.
When modifying the user_backends configuration, you need to
update the database table's backend field, or your users will lose
their configured display name.
If something does not work, check the log file at nextcloud/data/nextcloud.log.
uids in the database.
FTP
Authenticate Nextcloud users against a FTP server.
Configuration
You only need to supply the FTP host name or IP.
The second - optional - parameter determines if SSL should be used or not.
Add the following to config.php:
'user_backends' => array(
array(
'class' => 'OC_User_FTP',
'arguments' => array('127.0.0.1'),
),
),
To enable SSL connections via ftps, append a second parameter true:
'user_backends' => array(
array(
'class' => 'OC_User_FTP',
'arguments' => array('127.0.0.1', true),
),
),
Dependencies
PHP automatically contains basic FTP support.
For SSL-secured FTP connections via ftps, the PHP openssl extension needs to be activated.
IMAP
Authenticate Nextcloud users against an IMAP server. IMAP user and password need to be given for the Nextcloud login.
Configuration
The parameters are host, port, sslmode, domain.
Possible values for sslmode are ssl or tls.
Add the following to your config.php:
'user_backends' => array(
array(
'class' => 'OC_User_IMAP',
'arguments' => array(
'127.0.0.1', 993, 'ssl', 'example.com', true, false
),
),
),
This connects to the IMAP server on IP 127.0.0.1.
The default port is 143. However, note that parameter order matters and if
you want to restrict the domain (4th parameter), you need to also specify
the port (2nd parameter) and sslmode (3rd parameter; set to null for
insecure connection).
If a domain name (e.g. example.com) is specified, then this makes sure that
only users from this domain will be allowed to login. If the fifth parameter
is set to true, after successfull login the domain part will be striped and
the rest used as username in Nextcloud. e.g. '[email protected]' will be
'username' in Nextcloud. The sixth parameter toggles whether on creation of
the user, it is added to a group corresponding to the name of the domain part
of the address.
config.php you also have to change the backend column in the users_external table of the database. In your pre 0.6.0 database it may look like {127.0.0.1:993/imap/ssl/readonly}INBOX or similar, but now it has to be just 127.0.0.1 for everything to work flawless again.
Samba
Utilizes the smbclient executable to authenticate against a windows
network machine via SMB.
Configuration
The only supported parameter is the hostname of the remote machine.
Add the following to your config.php:
'user_backends' => array(
array(
'class' => 'OC_User_SMB',
'arguments' => array('127.0.0.1'),
),
),
Dependencies
The smbclient executable needs to be installed and accessible within $PATH.
WebDAV
Authenticate users by a WebDAV call. You can use any WebDAV server, Nextcloud server or other web server to authenticate. It should return http 200 for right credentials and http 401 for wrong ones.
Attention: This app is not compatible with the LDAP user and group backend. This app is not the WebDAV interface of Nextcloud, if you don't understand what it does then do not enable it.
Configuration
The only supported parameter is the URL of the web server.
Add the following to your config.php:
'user_backends' => array(
array(
'class' => '\OCA\User_External\WebDAVAuth',
'arguments' => array('https://example.com/webdav'),
),
),
BasicAuth
Authenticate users by an HTTP Basic access authentication call. HTTP server of your choice to authenticate. It should return HTTP 2xx for correct credentials and an appropriate other error code for wrong ones or refused access. The HTTP server must respond to any requests to the target URL with the "www-authenticate" header set. Otherwise BasicAuth considers itself to be misconfigured or the HTTP server unfit for authentication.
Configuration
The only supported parameter is the URL of the web server where the authentication happens.
Add the following to your config.php:
'user_backends' => array(
array(
'class' => 'OC_User_BasicAuth',
'arguments' => array('https://example.com/basic_auth'),
),
),
SSH
Authenticates users via SSH. You can use any SSH2 server, but it must accept password authentication.
Configuration
The supported parameters are the hostname and the port (default 22) of the remote machine.
Add the following to your config.php:
'user_backends' => array(
array(
'class' => 'OC_User_SSH',
'arguments' => array('127.0.0.1', '22'),
),
),
Dependencies
Requires the php-ssh2 PECL module installed.
XMPP (Prosody)
Authenticate Nextcloud users against a Prosody XMPP MySQL database. Prosody user and password need to be given for the Nextcloud login.
Configuration
Add the following to your config.php:
'user_backends' => array (
0 => array (
'class' => 'OC_User_XMPP',
'arguments' => array (
0 => 'dbhost',
1 => 'prosodydb',
2 => 'dbuser',
3 => 'dbuserpassword',
4 => 'xmppdomain',
5 => true,
),
),
),
0 - Database Host 1 - Prosody Database Name 2 - Database User 3 - Database User Password 4 - XMPP Domain 5 - Hashed Passwords in Database (true) / Plaintext Passwords in Database (false)
Alternatives
Other extensions allow connecting to external user databases directly via SQL, which may be faster: