Mumble Server LDAP

A Mumble Server container with support for an LDAP back-end

Some Initial Thoughts

Mumble is great, except for the fact that a Mumble server by default is wide open to the internet, allowing anyone to join and waste your bandwidth. There are things called authenticators that check a users name and password against some sort of a back-end database. This image combines the Mumble server with an LDAP authenticator.

I realize that there's literally dozens of people out there that self-host an LDAP server managing users, so this image may not be right for you. There are plenty of simple Mumble server images out there. This is not one of them.

Configuration

You really want to run this, huh? Okay. There's some setup to it though.

1. First, you're going to want to copy the two files out of /root/config and edit them to your liking.
   1. mumble-server.ini will need the icesecretwrite= set, for use in the authenticator config.
   2. LDAPauth.ini needs a slew of things set.
      1. secret will be the icesecretwrite= you set in mumble-server.ini
      2. ldap_uri's IP address will need to be the container name if running against an LDAP server container, e.g. ldap://openldap
      3. Having a readonly user in your LDAP server will probably save you some headaches.
      4. Fill in all that other stuff. Good luck.
   3. Don't worry about log paths in either config, they're going to be written to the /data volume.
2. Install an LDAP server.
   1. Yeah, not going to go into details on this one, because no one is actually going to be reading this.
   2. Let me know if you need help though, and I'll try to help out.
   3. I used osixia/openldap and osixia/phpldapadmin as my server and front-end, respectively.

Help Configuring LDAP

My goodness, I am such a nice person (take that with a grain of salt; I haven't actually tested this). Modify and import this LDIF into your LDAP server to create the necessary stuff. It adds:

1. Entry 1: readonly user cn=readonly,dc=example,dc=com with password readonly
2. Entry 4-5: example user uid=username,ou=users,dc=example,dc=com with password readonly
3. Entry 2-3: Mumble group cn=mumble,ou=groups,dc=example,dc=com with example user as it's only member

You'll want to modify dc=example,dc=com throughout the document to reflect whatever you're using. Once you import it, you can go and look at how the data is laid out, and modify it to your liking (for example, don't leave an example user with a default password in there!)

# LDIF Export for dc=example,dc=com
# Server: openldap (openldap)
# Search Scope: sub
# Search Filter: (objectClass=*)
# Total Entries: 8
#
# Generated by phpLDAPadmin (http://phpldapadmin.sourceforge.net) on October 27, 2018 4:38 pm
# Version: 1.2.3

version: 1

# Entry 1: cn=readonly,dc=example,dc=com
dn: cn=readonly,dc=example,dc=com
cn: readonly
description: LDAP read only user
objectclass: simpleSecurityObject
objectclass: organizationalRole
userpassword: {SSHA}R2OQaUpaUQNafw28LU1u3wwrCZ6QOBXk

# Entry 2: ou=groups,dc=example,dc=com
dn: ou=groups,dc=example,dc=com
objectclass: organizationalUnit
objectclass: top
ou: groups

# Entry 3: cn=mumble,ou=groups,dc=example,dc=com
dn: cn=mumble,ou=groups,dc=example,dc=com
cn: mumble
objectclass: groupOfUniqueNames
objectclass: top
uniquemember: uid=username,ou=users,dc=example,dc=com

# Entry 4: ou=users,dc=example,dc=com
dn: ou=users,dc=example,dc=com
objectclass: organizationalUnit
objectclass: top
ou: users

# Entry 5: uid=username,ou=users,dc=example,dc=com
dn: uid=username,ou=users,dc=example,dc=com
cn: FirstName
displayname: Username
objectclass: inetOrgPerson
objectclass: top
roomnumber: 1
sn: LastName
uid: username
userpassword: {SSHA}R2OQaUpaUQNafw28LU1u3wwrCZ6QOBXk

If you need even more help, check the authenticator itself at /root/opt/LDAPauth/LDAPauth.py. It has a nice LDAP layout and helpful hints.

A really cool neat thing I worked on for an entire Saturday was to remove the RoomNumber requirement in LDAP (and also to convert this whole thing to Python3). Simply setting number_attr to "entryUUID" in the config file will enable this feature. This will map everyones unique IDs in LDAP into a unique incrementing Mumble ID. When setting this, you will see an extra file entryuuid.map show up in the same directory as your LDAPauth.ini file. This file is what saves all the mappings between LDAP users and Mumble users, so don't ever modify it or lose it. If you can't handle that, just use "RoomNumber" and specify a room number for each user in LDAP.

How to Run

Simply run it like so:

docker run -p 64738:64738/tcp -p 64738:64738/udp -v /local/folder/for/config/files:/config -v /local/folder/for/persistence:/data -e TZ=America/Detroit -e PUID=1000 phasecorex/mumble-server-ldap

• -p 64738:64738/tcp -p 64738:64738/udp: Mumble server port (both TCP and UDP)
• -v /local/folder/for/config/files:/config: Folder where you kept those two config files you modified.
• -v /local/folder/for/persistence:/data: Folder to persist data.
• -e TZ=America/Detroit: Specify a timezone.
• -e PUID=1000: Specify the user this server will run as. All files it creates will be owned by this user on the host.
• -e PGID=1000: Can also be specified if you want a specific group. If not specified, the PGID will be used as the group.

You will have to somehow link this container to your LDAP server. That can either be by linking the containers, adding this to a docker-compose file, or running this Mumble server as a host container and hitting a locally installed LDAP server.

Final Thoughts

This image works for me, and that's all that really matters here. I can't really make the image easier to use, simply because LDAP is an unwieldy beast. If you need help setting anything up, I'll try to help out. Maybe if someone else goes through this pain of setting up an LDAP server, we can update this documentation to make it easier for others.