lex-identity-kerberos

LegionIO identity provider extension for Kerberos. Implements the unified identity provider contract by reading the authenticated Kerberos principal from legion-crypt and resolving it into a canonical identity hash.

Overview

This gem does not duplicate GSSAPI or LDAP logic. It reads the principal that was already resolved by legion-crypt's KerberosAuth at boot time. For outbound SPNEGO token acquisition, it delegates to lex-kerberos's Helpers::Spnego#obtain_spnego_token when that gem is loaded.

Provider Contract

Legion::Extensions::Identity::Kerberos::Identity.provider_name   # => :kerberos
Legion::Extensions::Identity::Kerberos::Identity.provider_type   # => :auth
Legion::Extensions::Identity::Kerberos::Identity.facing          # => :human
Legion::Extensions::Identity::Kerberos::Identity.priority        # => 100
Legion::Extensions::Identity::Kerberos::Identity.trust_weight    # => 50
Legion::Extensions::Identity::Kerberos::Identity.capabilities
# => [:authenticate, :profile, :vault_auth, :outbound_auth]

resolve

Returns an identity hash or nil:

{
  canonical_name: 'miverso2',          # ^[a-z0-9][a-z0-9_-]*$ — no dots (AMQP word separator)
  kind:           :human,
  source:         :kerberos,
  principal:      'miverso2@MS.DS.UHC.COM',
  realm:          'MS.DS.UHC.COM',
  groups:         []                   # group lookup is lex-identity-ldap's responsibility
}

Returns nil when no Kerberos principal is available.

normalize(val)

Strips @REALM, downcases, trims whitespace, and removes characters outside [a-z0-9_-]:

Identity.normalize('User.Name@REALM.COM')  # => 'username'
Identity.normalize('miverso2@MS.DS.UHC.COM')  # => 'miverso2'

provide_token

Returns a Legion::Identity::Lease with a SPNEGO token (10-hour validity), or nil on failure:

lease = Identity.provide_token
lease.provider    # => :kerberos
lease.credential  # => '<base64-spnego-token>'
lease.expires_at  # => Time (10h from now)
lease.renewable   # => true
lease.valid?      # => true
lease.metadata    # => { realm: 'MS.DS.UHC.COM' }

Requires lex-kerberos to be loaded and Legion::Settings[:kerberos][:service_principal] to be set.

vault_auth

Stub returning nil. Phase 5 implementation pending.

Dependencies

Required:

• legion-json (>= 1.2.1)
• legion-settings (>= 1.3.14)

Optional (guarded with defined?):

• legion-crypt — for Legion::Crypt.kerberos_principal
• lex-kerberos — for Legion::Extensions::Kerberos::Helpers::Spnego#obtain_spnego_token

Installation

Add to your Gemfile:

gem 'lex-identity-kerberos'

License

MIT