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LDAP Configuring LDAP Authelia supports an LDAP server based first factor user provider. This section describes configuring this. 2022-03-20T12:52:27+11:00 false
configuration
parent
first-factor
102200 true
/c/ldap
/docs/configuration/authentication/ldap.html

Configuration

authentication_backend:
  ldap:
    implementation: custom
    url: ldap://127.0.0.1
    timeout: 5s
    start_tls: false
    tls:
      server_name: ldap.example.com
      skip_verify: false
      minimum_version: TLS1.2
    base_dn: DC=example,DC=com
    additional_users_dn: ou=users
    users_filter: (&({username_attribute}={input})(objectClass=person))
    username_attribute: uid
    mail_attribute: mail
    display_name_attribute: displayName
    additional_groups_dn: ou=groups
    groups_filter: (&(member={dn})(objectClass=groupOfNames))
    group_name_attribute: cn
    permit_referrals: false
    user: CN=admin,DC=example,DC=com
    password: password

Options

implementation

{{< confkey type="string" default="custom" required="no" >}}

Configures the LDAP implementation used by Authelia.

See the Implementation Guide for information.

url

{{< confkey type="string" required="yes" >}}

The LDAP URL which consists of a scheme, address, and port. Format is <scheme>://<address>:<port> or <scheme>://<address> where scheme is either ldap or ldaps.

authentication_backend:
  ldap:
    url: ldaps://dc1.example.com

If utilising an IPv6 literal address it must be enclosed by square brackets:

authentication_backend:
  ldap:
    url: ldap://[fd00:1111:2222:3333::1]

timeout

{{< confkey type="duration" default="5s" required="no" >}}

The timeout for dialing an LDAP connection.

start_tls

{{< confkey type="boolean" default="false" required="no" >}}

Enables use of the LDAP StartTLS process which is not commonly used. You should only configure this if you know you need it. The initial connection will be over plain text, and Authelia will try to upgrade it with the LDAP server. LDAPS URL's are slightly more secure.

tls

Controls the TLS connection validation process. You can see how to configure the tls section here.

base_dn

{{< confkey type="string" required="yes" >}}

Sets the base distinguished name container for all LDAP queries. If your LDAP domain is example.com this is usually DC=example,DC=com, however you can fine tune this to be more specific for example to only include objects inside the authelia OU: OU=authelia,DC=example,DC=com. This is prefixed with the additional_users_dn for user searches and additional_groups_dn for groups searches.

additional_users_dn

{{< confkey type="string" required="no" >}}

Additional LDAP path to append to the base_dn when searching for users. Useful if you want to restrict exactly which OU to get users from for either security or performance reasons. For example setting it to OU=users,OU=people with a base_dn set to DC=example,DC=com will mean user searches will occur in OU=users,OU=people,DC=example,DC=com.

users_filter

{{< confkey type="string" required="situational" >}}

Note: This option is technically required however the implementation option can implicitly set a default negating this requirement. Refer to the filter defaults for more information.

The LDAP filter to narrow down which users are valid. This is important to set correctly as to exclude disabled users. The default value is dependent on the implementation, refer to the attribute defaults for more information.

username_attribute

{{< confkey type="string" required="situational" >}}

Note: This option is technically required however the implementation option can implicitly set a default negating this requirement. Refer to the attribute defaults for more information.

The LDAP attribute that maps to the username in Authelia. This must contain the {username_attribute} placeholder.

mail_attribute

{{< confkey type="string" required="situational" >}}

Note: This option is technically required however the implementation option can implicitly set a default negating this requirement. Refer to the attribute defaults for more information.

The attribute to retrieve which contains the users email addresses. This is important for the device registration and password reset processes. The user must have an email address in order for Authelia to perform identity verification when a user attempts to reset their password or register a second factor device.

display_name_attribute

{{< confkey type="string" required="situational" >}}

Note: This option is technically required however the implementation option can implicitly set a default negating this requirement. Refer to the attribute defaults for more information.

The attribute to retrieve which is shown on the Web UI to the user when they log in.

additional_groups_dn

{{< confkey type="string" required="no" >}}

Similar to additional_users_dn but it applies to group searches.

groups_filter

{{< confkey type="string" required="situational" >}}

Note: This option is technically required however the implementation option can implicitly set a default negating this requirement. Refer to the filter defaults for more information.

Similar to users_filter but it applies to group searches. In order to include groups the member is not a direct member of, but is a member of another group that is a member of those (i.e. recursive groups), you may try using the following filter which is currently only tested against Microsoft Active Directory:

(&(member:1.2.840.113556.1.4.1941:={dn})(objectClass=group)(objectCategory=group))

group_name_attribute

{{< confkey type="string" required="situational" >}}

Note: This option is technically required however the implementation option can implicitly set a default negating this requirement. Refer to the attribute defaults for more information.

The LDAP attribute that is used by Authelia to determine the group name.

permit_referrals

{{< confkey type="boolean" default="false" required="no" >}}

Permits following referrals. This is useful if you have read-only servers in your architecture and thus require referrals to be followed when performing write operations.

user

{{< confkey type="string" required="yes" >}}

The distinguished name of the user paired with the password to bind with for lookup and password change operations.

password

{{< confkey type="string" required="yes" >}}

The password of the user paired with the user to bind with for lookup and password change operations. Can also be defined using a secret which is the recommended for containerized deployments.

Implementation Guide

There are currently two implementations, custom and activedirectory. The activedirectory implementation must be used if you wish to allow users to change or reset their password as Active Directory uses a custom attribute for this, and an input format other implementations do not use. The long term intention of this is to have logical defaults for various RFC implementations of LDAP.

Filter replacements

Various replacements occur in the user and groups filter. The replacements either occur at startup or upon an LDAP search.

Users filter replacements

Placeholder Phase Replacement
{username_attribute} startup The configured username attribute
{mail_attribute} startup The configured mail attribute
{display_name_attribute} startup The configured display name attribute
{input} search The input into the username field

Groups filter replacements

Placeholder Phase Replacement
{input} search The input into the username field
{username} search The username from the profile lookup obtained from the username attribute
{dn} search The distinguished name from the profile lookup

Defaults

The below tables describes the current attribute defaults for each implementation.

Attribute defaults

This table describes the attribute defaults for each implementation. i.e. the username_attribute is described by the Username column.

Implementation Username Display Name Mail Group Name
custom N/A displayName mail cn
activedirectory sAMAccountName displayName mail cn

Filter defaults

The filters are probably the most important part to get correct when setting up LDAP. You want to exclude disabled accounts. The active directory example has two attribute filters that accomplish this as an example (more examples would be appreciated). The userAccountControl filter checks that the account is not disabled and the pwdLastSet makes sure that value is not 0 which means the password requires changing at the next login.

Implementation Users Filter Groups Filter
custom N/A N/A
activedirectory (&(|({username_attribute}={input})({mail_attribute}={input}))(sAMAccountType=805306368)(!(userAccountControl:1.2.840.113556.1.4.803:=2))(!(pwdLastSet=0))) (&(member={dn})(objectClass=group)(objectCategory=group))

Note: The Active Directory filter (sAMAccountType=805306368) is exactly the same as (&(objectCategory=person)(objectClass=user)) except that the former is more performant, you can read more about this and other Active Directory filters on the TechNet wiki.

Refresh Interval

It's recommended you either use the default refresh interval or configure this to a value low enough to refresh the user groups and status (deleted, disabled, etc) to adequately secure your environment.

Important notes

Users must be uniquely identified by an attribute, this attribute must obviously contain a single value and be guaranteed by the administrator to be unique. If multiple users have the same value, Authelia will simply fail authenticating the user and display an error message in the logs.

In order to avoid such problems, we highly recommended you follow RFC2307 by using sAMAccountName for Active Directory and uid for other implementations as the attribute holding the unique identifier for your users.