LDAP Authentication

Grafana (2.1 and newer) ships with a strong LDAP integration feature. The LDAP integration in Grafana allows your Grafana users to login with their LDAP credentials. You can also specify mappings between LDAP group memberships and Grafana Organization user roles.

Configuration

You turn on LDAP in the main config file as well as specify the path to the LDAP specific configuration file (default: /etc/grafana/ldap.toml).

Example config

# Set to true to log user information returned from LDAP
verbose_logging = false

[[servers]]
# Ldap server host (specify multiple hosts space separated)
host = "127.0.0.1"
# Default port is 389 or 636 if use_ssl = true
port = 389
# Set to true if ldap server supports TLS
use_ssl = false
# Set to true if connect ldap server with STARTTLS pattern (create connection in insecure, then upgrade to secure connection with TLS)
start_tls = false
# set to true if you want to skip ssl cert validation
ssl_skip_verify = false
# set to the path to your root CA certificate or leave unset to use system defaults
# root_ca_cert = "/path/to/certificate.crt"

# Search user bind dn
bind_dn = "cn=admin,dc=grafana,dc=org"
# Search user bind password
# If the password contains # or ; you have to wrap it with trippel quotes. Ex """#password;"""
bind_password = 'grafana'

# User search filter, for example "(cn=%s)" or "(sAMAccountName=%s)" or "(uid=%s)"
search_filter = "(cn=%s)"

# An array of base dns to search through
search_base_dns = ["dc=grafana,dc=org"]

# In POSIX LDAP schemas, without memberOf attribute a secondary query must be made for groups.
# This is done by enabling group_search_filter below. You must also set member_of= "cn"
# in [servers.attributes] below.

## Group search filter, to retrieve the groups of which the user is a member (only set if memberOf attribute is not available)
# group_search_filter = "(&(objectClass=posixGroup)(memberUid=%s))"
## An array of the base DNs to search through for groups. Typically uses ou=groups
# group_search_base_dns = ["ou=groups,dc=grafana,dc=org"]

# Specify names of the ldap attributes your ldap uses
[servers.attributes]
name = "givenName"
surname = "sn"
username = "cn"
member_of = "memberOf"
email =  "email"

# Map ldap groups to grafana org roles
[[servers.group_mappings]]
group_dn = "cn=admins,dc=grafana,dc=org"
org_role = "Admin"
# The Grafana organization database id, optional, if left out the default org (id 1) will be used
# org_id = 1

[[servers.group_mappings]]
group_dn = "cn=users,dc=grafana,dc=org"
org_role = "Editor"

[[servers.group_mappings]]
# If you want to match all (or no ldap groups) then you can use wildcard
group_dn = "*"
org_role = "Viewer"

Bind & Bind Password

By default the configuration expects you to specify a bind DN and bind password. This should be a read only user that can perform LDAP searches. When the user DN is found a second bind is performed with the user provided username & password (in the normal Grafana login form).

bind_dn = "cn=admin,dc=grafana,dc=org"
bind_password = "grafana"

Single Bind Example

If you can provide a single bind expression that matches all possible users, you can skip the second bind and bind against the user DN directly. This allows you to not specify a bind_password in the configuration file.

bind_dn = "cn=%s,o=users,dc=grafana,dc=org"

In this case you skip providing a bind_password and instead provide a bind_dn value with a %s somewhere. This will be replaced with the username entered in on the Grafana login page. The search filter and search bases settings are still needed to perform the LDAP search to retrieve the other LDAP information (like LDAP groups and email).

POSIX schema (no memberOf attribute)

If your ldap server does not support the memberOf attribute add these options:

## Group search filter, to retrieve the groups of which the user is a member (only set if memberOf attribute is not available)
group_search_filter = "(&(objectClass=posixGroup)(memberUid=%s))"
## An array of the base DNs to search through for groups. Typically uses ou=groups
group_search_base_dns = ["ou=groups,dc=grafana,dc=org"]

Also change set member_of = "cn" in the [servers.attributes] section.

LDAP to Grafana Org Role Sync

Mappings

In [[servers.group_mappings]] you can map an LDAP group to a Grafana organization and role. These will be synced every time the user logs in, with LDAP being the authoritative source. So, if you change a user’s role in the Grafana Org. Users page, this change will be reset the next time the user logs in. If you change the LDAP groups of a user, the change will take effect the next time the user logs in.

Priority

The first group mapping that an LDAP user is matched to will be used for the sync. If you have LDAP users that fit multiple mappings, the topmost mapping in the TOML config will be used.