Configure Control Center with LDAP authentication on Confluent Platform

Control Center provides HTTP Basic authentication through JAAS.

The following tutorial describes the steps necessary to enable HTTP Basic authentication backed by LDAP. This includes but is not limited to the Active Directory (AD) LDAP implementation.

Escaping special characters

Important

Escape any restricted LDAP characters. For best results, avoid characters that require escaping. Follow Best Practices for LDAP Naming Attributes.

Character	Description
,	Comma [1]
\	Backslash
#	Pound (hash) [2]
+	Plus sign
=	Equals sign
<	Less than
>	Greater than
;	Semi-colon
''	Double quote
	Spaces [3]

[1]	Requires escaping with a double backslash or \5c. See RFC 2254.

[2]	You only need to escape pound (hash) # if it occurs at the beginning of a string.

[3]	Leading or trailing spaces must be escaped. Embedded spaces are not escaped.

Configure Control Center JAAS

1. Create a JAAS configuration file with the following content and save as control-center-jaas.conf.

   Note

   Do not enter any commented lines within the JAAS configuration file. The # character is not allowed. Comments in the JAAS file interfere with parsing the configuration parameters when running Control Center.

   c3 {
     org.eclipse.jetty.jaas.spi.LdapLoginModule required
   
     useLdaps="false"
     contextFactory="com.sun.jndi.ldap.LdapCtxFactory"
     hostname="ad.confluent.io"
     port="389"
     bindDn="cn=admin,dc=confluent,dc=io"
     bindPassword="password"
     authenticationMethod="simple"
     forceBindingLogin="true"
     userBaseDn="ou=People,dc=confluent,dc=io"
     userRdnAttribute="sAMAccountName"
     userIdAttribute="sAMAccountName"
     userPasswordAttribute="userPassword"
     userObjectClass="user"
     roleBaseDn="ou=Groups,DC=confluent,DC=org"
     roleNameAttribute="cn"
     roleMemberAttribute="member"
     roleObjectClass="group";
   };
   

   Important

   If the bindDn, userBaseDn, or roleBaseDn contains special characters, escape them with a backslash. The comma character is designated by the LDAP filter specification as a reserved separator character for CN and OU. Any CN or OU that contains a comma , character needs to be escaped with a double backslash in the LDAP JAAS configuration file. For example, "CN=adminstrator, firstclass, is escaped as follows: "CN=administrator\\, firstclass,OU=users,DC=confluent,DC=io". For further discussion about LDAP filtering and escaping, refer to this Stack Overflow article.

2. Add these configuration options to the Control Center configuration file (control-center.properties).

   # The name of the configuration block in the JAAS configuration
   confluent.controlcenter.rest.authentication.realm=c3
   # HTTP authentication type
   confluent.controlcenter.rest.authentication.method=BASIC
   # To enabled restricted access, add this line
   confluent.controlcenter.auth.restricted.roles=RestrictedGroupName
   # Add roles defined in the JAAS configuration file here
   confluent.controlcenter.rest.authentication.roles=c3users,RestrictedGroupName
   

Be aware that Control Center allows restricted access as shown above in lines 5 and 6; no editing or creating is allowed using the UI. For more information about Control Center configuration, see Control Center Configuration Reference for Confluent Platform.

Note

• A user with membership in multiple groups is granted only the most restrictive permissions. For example, if a user is a member of two groups, admin and readonly, and readonly is a restricted role, then the user is granted only the rights for the readonly group.
• Enabling restricted roles also prevents users from inspecting topics and running ksqlDB queries.
• For fine-grained access control, consider configuring role-based access control (RBAC).
• Messages cannot be viewed if LDAP Basic Auth is implemented and the user is a member of a restricted group. If users need to view messages, consider using RBAC instead of LDAP Basic Auth.

Start Control Center

You must pass a few system flags to the JVM at Control Center start-up. To do so, export the CONTROL_CENTER_OPTS flag as shown below.

Note

Replace /path/to with the actual filepath.

CONTROL_CENTER_OPTS="-Djava.security.auth.login.config=/path/to/propertyfile.jaas" \
control-center-start /path/to/control-center.properties``

When a user accesses Control Center, they are shown a dialog similar to the one that follows, which prompts them for sign-in credentials.

For more information about Control Center properties files, see Control Center Configuration Examples for Confluent Platform.

Configure LdapLoginModule

Configure the LdapLoginModule.

debug

Indicate whether to turn on debug output.

contextFactory

Specify the LDAP context factory class; for example, com.sun.jndi.ldap.LdapCtxFactory.

hostname

Specify the hostname of the LDAP server.

port

Specify the port on which the LDAP server should listen. Default port is 389 for non-TLS/SSL LDAP and AD; 636 for TLS/SSL LDAP and AD.

bindDn

Required. If not using binding authentication, set this to the root DN that should bind; for example, cn=administrator,dc=confluent,dc=io.

See Escaping special characters.

bindPassword

Specify the password for bindDn.

See Escaping special characters.

authenticationMethod

Use authenticationMethod=simple. This is the only LDAP authentication method currently supported by Control Center.

forceBindingLogin

Indicate whether to bind as the user that is authenticating (true), otherwise bind as the manager and perform a search to verify user password (false).

useLdaps

Indicate whether to use Secure LDAP (LDAPS), required when TLS/SSL is enabled. Set to true to use LDAPS. The default value is false.

userBaseDn

Specify the base DN to search for users; for example: ou=People,dc=cops,dc=confluent,dc=io.

See Escaping special characters.

userRdnAttribute

Specify the attribute name for username, used when searching for user role membership by DN, default uid.

userIdAttribute

Specify the attribute name to identify user by username. The default value is acn.

userPasswordAttribute

Specify the attribute name for user password. The default value is userPassword.

userObjectClass

Specify the attribute name for user object class. The default value is inetOrgPerson.

roleBaseDn

Specify the base DN for role membership search; for example, ou=Groups,dc=cops,dc=confluent,dc=io.

See Escaping special characters.

roleNameAttribute

Specify the attribute name for role name. The default value is roleName.

roleMemberAttribute

Specify the attribute name for a role that would contain a user’s DN. The default value is uniqueMember.

roleUsernameMemberAttribute

Specify the attribute name for a role that would contain a user’s username. If set, this overrides the roleMemberAttribute behavior.

roleObjectClass

Specify the object class for role. The default value is groupOfUniqueNames.

rolePrefix

Specify the prefix string to remove from role names before returning to the application, for example, confluent\_.