glauth

GLAuth: LDAP authentication server for developers

Go-lang LDAP Authentication (GLAuth) is a secure, easy-to-use, LDAP server w/ configurable backends.

• Centrally manage accounts across your infrastructure
• Centrally manage SSH keys, Linux accounts, and passwords for cloud servers.
• Lightweight alternative to OpenLDAP and Active Directory for development, or a homelab.
• Store your user directory in a local file, S3 or proxy to existing LDAP servers.

Use it to centralize account management across your Linux servers, your OSX machines, and your support applications (Jenkins, Apache/Nginx, Graylog2, and many more!).

Contributing

Please base all PRs on dev, not master.

Quickstart

This quickstart is a great way to try out GLAuth in a non-production environment. Be warned that you should take the extra steps to setup SSL (TLS) for production use!

1. Install GLAuth on a test server
2. Clone the repo: git clone https://github.com/nmcclain/glauth
3. Start the GLAuth server: cd glauth; sudo bin/glauth32 -c sample-simple.cfg
4. Test with traditional LDAP tools
5. ldapsearch -LLL -H ldap://localhost:389 -D cn=serviceuser,ou=svcaccts,dc=glauth,dc=com -w mysecret -x -bdc=glauth,dc=com cn=hackers

Usage:

glauth: securely expose your LDAP for external auth

Usage:
  glauth [options] -c <file|s3url>
  glauth -h --help
  glauth --version

Options:
  -c, --config <file>       Config file.
  -K <aws_key_id>           AWS Key ID.
  -S <aws_secret_key>       AWS Secret Key.
  -r <aws_region>           AWS Region [default: us-east-1].
  -h, --help                Show this screen.
  --version                 Show version.

Configuration:

GLAuth can be deployed as a single server using only a local configuration file. This is great for testing, or for production if you use a tool like Puppet/Chef/Ansible:

glauth -c glauth.cfg

Here's a sample config wth hardcoded users and groups:

[backend]
  datastore = "config"
  baseDN = "dc=glauth,dc=com"
[[users]]
  name = "hackers"
  unixid = 5001
  primarygroup = 5501
  passsha256 = "6478579e37aff45f013e14eeb30b3cc56c72ccdc310123bcdf53e0333e3f416a"   # dogood
  sshkeys = [ "ssh-dss AAAAB3..." ]
[[groups]]
  name = "superheros"
  unixid = 5501

To create the password SHA hash, use this command: echo -n "mysecret" | openssl dgst -sha256 Instead of a local configuration file, GLAuth can fetch its configuration from S3. This is an easy way to ensure redundant GLAuth servers are always in-sync.

glauth -c s3://bucketname/glauth.cfg

In order to use S3, you must set your AWS credentials. Either:

1. set the -K and -S command-line flags OR
2. set the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables.

More configuration options are documented here: https://github.com/nmcclain/glauth/blob/master/sample-simple.cfg

Required Fields

• Name
  • The user's username
• ou
  • ID of the user's primary group
• uidbumber
  • The user's unix user id
• sshPublicKey
  • Specify an array of public keys

Optional Fields

• givenname
  • First name
  • Example: John
  • default = blank
• sn
  • Last name
  • Example: Doe
  • default = blank
• disabled
  • Specify if account is active.
  • Set to 'true' (without quotes) to make the LDAP entry add 'AccountStatus = inactive'
  • default = false (active)
• mail
  • Specify an email
  • example: jdoe@example.com
  • default = blank
• loginshell
  • Specify a different login shell for the user
  • Example: /bin/sh, or /sbin/nologin
  • default = /bin/bash
• homedirectory
  • Specify an overridden home directory for the user
  • Example: /home/itadmin
  • default = /home/[username]

OpenSSH keys:

GLAuth can store a user's SSH authorized keys. Add one or more keys per user as shown above, then setup the goklp helper: https://github.com/appliedtrust/goklp

Backends:

For advanced users, GLAuth supports pluggable backends. Currently, it can use a local file, S3 or an existing LDAP infrastructure. In the future, we hope to have backends that support Mongo, SQL, and other datastores.

[backend]
  datastore = "ldap"
  servers = [ "ldaps://server1:636", "ldaps://server2:636" ]

Production:

Any of the architectures above will work for production. Just remember:

• Always use legit SSL certs for production!

Building:

You'll need go-bindata to build GLAuth:

go get github.com/jteeuwen/go-bindata/...