class Ldap # Class for handling LDAP Groups. # ATTENTION: Make sure to add the following lines to your code if accessing this class. # Otherwise Rails will autoload the Group model or might throw parameter errors if crearing # an ::Ldap instance. # # @example # require 'ldap' # require 'ldap/user' class User include Ldap::FilterLookup BLACKLISTED = [ :admincount, :accountexpires, :badpasswordtime, :badpwdcount, :countrycode, :distinguishedname, :dnshostname, :dscorepropagationdata, :instancetype, :iscriticalsystemobject, :useraccountcontrol, :usercertificate, :objectclass, :objectcategory, :objectguid, :objectsid, :primarygroupid, :pwdlastset, :lastlogoff, :lastlogon, :lastlogontimestamp, :localpolicyflags, :lockouttime, :logoncount, :logonhours, :'msdfsr-computerreferencebl', :'msds-supportedencryptiontypes', :ridsetreferences, :samaccounttype, :memberof, :serverreferencebl, :serviceprincipalname, :showinadvancedviewonly, :usnchanged, :usncreated, :whenchanged, :whencreated, ].freeze # Returns the uid attribute. # # @param attributes [Hash{Symbol=>Array}] A list of LDAP User attributes which should get checked for available uids. # # @example # Ldap::User.uid_attribute(attributes) # # @return [String] The uid attribute. def self.uid_attribute(attributes) result = nil %i(samaccountname userprincipalname uid dn).each { |attribute| next if attributes[attribute].blank? result = attribute.to_s break } result end # Initializes a wrapper around Net::LDAP and ::Ldap to handle LDAP users. # # @param [Hash] config the configuration for establishing a LDAP connection. Default is Setting 'ldap_config'. # @option config [String] :uid_attribute The uid attribute. Default is determined automatically. # @option config [String] :filter The filter for LDAP users. Default is determined automatically. # @param ldap [Ldap] An optional existing Ldap class instance. Default is a new connection with given configuration. # # @example # require 'ldap' # require 'ldap/user' # ldap_user = Ldap::User.new # # @return [nil] def initialize(config = nil, ldap: nil) @ldap = ldap || ::Ldap.new(config) handle_config(config) end # Checks if given username and password combination is valid for the connected LDAP. # # @param username [String] The username. # @param password [String] The password. # # @example # ldap_user.valid?('example_user', 'pw1234') # #=> true # # @return [Boolean] The valid state of the username and password combination. def valid?(username, password) bind_success = @ldap.connection.bind_as( base: @ldap.base_dn, filter: "(#{uid_attribute}=#{username})", password: password ) message = bind_success ? 'successful' : 'failed' Rails.logger.info "ldap authentication for user '#{username}' (#{uid_attribute}) #{message}!" bind_success.present? end # Determines possible User attributes with example values. # # @param filter [String] The filter for listing users. Default is initialization parameter. # @param base_dn [String] The applied base DN for listing users. Default is Ldap#base_dn. # # @example # ldap_user.attributes # #=> {:dn=>"dn (e. g. CN=Administrator,CN=Users,DC=domain,DC=tld)", ...} # # @return [Hash{Symbol=>String}] The available User attributes as key and the name and an example as value. def attributes(filter: nil, base_dn: nil) filter ||= filter() attributes = {} known_attributes = BLACKLISTED.dup lookup_counter = 1 @ldap.search(filter, base: base_dn) do |entry| new_attributes = entry.attribute_names - known_attributes if new_attributes.blank? lookup_counter += 1 # check max 50 entries with # the same attributes in a row break if lookup_counter == 50 next end new_attributes.each do |attribute| value = entry[attribute] next if value.blank? next if value[0].blank? example_value = value[0].force_encoding('UTF-8').encode('utf-8', 'binary', invalid: :replace, undef: :replace, replace: '?') attributes[attribute] = "#{attribute} (e. g. #{example_value})" end known_attributes.concat(new_attributes) lookup_counter = 0 end attributes end # The active filter of the instance. If none give on initialization an automatic lookup is performed. # # @example # ldap_user.filter # #=> '(objectClass=user)' # # @return [String, nil] The active or found filter or nil if none could be found. def filter @filter ||= lookup_filter(['(&(objectClass=user)(samaccountname=*)(!(samaccountname=*$)))', '(objectClass=user)', '(objectClass=posixaccount)', '(objectClass=person)']) end # The active uid attribute of the instance. If none give on initialization an automatic lookup is performed. # # @example # ldap_user.uid_attribute # #=> 'samaccountname' # # @return [String, nil] The active or found uid attribute or nil if none could be found. def uid_attribute @uid_attribute ||= self.class.uid_attribute(attributes) end private def handle_config(config) return if config.blank? @uid_attribute = config[:uid_attribute] @filter = config[:filter] end end end