Class: ActiveLDAP::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/activeldap/base.rb

Overview

Base

Base is the primary class which contains all of the core ActiveLDAP functionality. It is meant to only ever be subclassed by extension classes.

Constant Summary collapse

@@config =

All class-wide variables

nil
@@schema =

Container for current connection settings

nil
@@conn =

LDAP server’s schema

nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(val = '') ⇒ Base

new

Creates a new instance of Base initializing all class and instance variables. initialize2() must be called to complete all initialization. defines local defaults. See examples If multiple values exist for dnattr, the first one put here will be authoritative TODO: Add support for relative distinguished names



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# File 'lib/activeldap/base.rb', line 475

def initialize(val='')
  if val.class != String
    raise TypeError, "Object key must be a String"
  end
  # Try a default connection if none made explicitly
  unless Base.connection
    # Use @@config if it has been prepopulated and the conn is down.
    if @@config
      ActiveLDAP::Base.connect(@@config)
    else
      ActiveLDAP::Base.connect
    end
  end

  @data = {} # where the r/w entry data is stored
  @data.default = []
  @ldap_data = {} # original ldap entry data
  @ldap_data.default = []
  @attr_methods = {} # list of valid method calls for attributes used for dereferencing

  # Break val apart if it is a dn
  if val.match(/^#{dnattr()}=([^,=]+),#{base()}$/i)
    val = $1
  elsif val.match(/[=,]/)
    @@logger.info "initialize: Changing val from '#{val}' to '' because it doesn't match the DN."
    val = ''
  end

  # Do a search - if it exists, pull all data and parse schema, if not, just set the hierarchical data
  if val.empty?
    @exists = false
    # Setup what should eb authoritative
    @dn = "#{dnattr()}=#{val},#{base()}"
    send(:apply_objectclass, required_classes())
  else # do a search then
    # Search for the existing entry
    begin
      # Get some attributes
      Base.connection.search("#{dnattr()}=#{val},#{base()}", LDAP::LDAP_SCOPE_SUBTREE, "objectClass=*")  do |m|
        # Save DN
        @dn = m.dn
        # Load up data into tmp
        @@logger.debug("loading entry: #{@dn}")
        m.attrs.each do |attr|
          # Load with subtypes just like @data
          @@logger.debug("calling make_subtypes for m.vals(attr).dup")
          safe_attr, value = make_subtypes(attr, m.vals(attr).dup)
          @@logger.debug("finished make_subtypes for #{attr}")
          # Add subtype to any existing values
          if @ldap_data.has_key? safe_attr
            value.each do |v|
              @ldap_data[safe_attr].push(v)
            end
          else
            @ldap_data[safe_attr] = value
          end
        end
      end
      @exists = true
      # Populate schema data
      send(:apply_objectclass, @ldap_data['objectClass'])

      # Populate real data now that we have the schema with aliases
      @ldap_data.each do |pair|
        send(:attribute_method=, pair[0], pair[1].dup)
      end

    rescue LDAP::ResultError
      @exists = false
      # Create what should be the authoritative DN
      @dn = "#{dnattr()}=#{val},#{base()}"
      send(:apply_objectclass, required_classes())

      # Setup dn attribute (later rdn too!)
      attr_sym = "#{dnattr()}=".to_sym
      @@logger.debug("new: setting dnattr: #{dnattr()} = #{val}")
      send(attr_sym, val)
    end
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object

method_missing

If a given method matches an attribute or an attribute alias then call the appropriate method. TODO: Determine if it would be better to define each allowed method

using class_eval instead of using method_missing.  This would
give tab completion in irb.

Raises:

  • (NoMethodError) 


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# File 'lib/activeldap/base.rb', line 810

def method_missing(name, *args)
  @@logger.debug("stub: called method_missing(#{name.inspect}, #{args.inspect})")

  # dynamically update the available attributes without requiring an
  # explicit call. The cache 'last_oc' saves a lot of cpu time.
  if @data['objectClass'] != @last_oc
    @@logger.debug("method_missing(#{name.inspect}, #{args.inspect}): updating apply_objectclass(#{@data['objectClass'].inspect})")
    send(:apply_objectclass, @data['objectClass'])
  end
  key = name.to_s
  case key
    when /^(\S+)=$/
      real_key = $1
      @@logger.debug("method_missing: attr_methods has_key? #{real_key}")
      if @attr_methods.has_key? real_key
        raise ArgumentError, "wrong number of arguments (#{args.size} for 1)" if args.size != 1
        @@logger.debug("method_missing: calling :attribute_method=(#{real_key}, #{args[0]})")
        return send(:attribute_method=, real_key, args[0])
      end
    else
      @@logger.debug("method_missing: attr_methods has_key? #{key}")
      if @attr_methods.has_key? key
        raise ArgumentError, "wrong number of arguments (#{args.size} for 1)" if args.size > 1
        return attribute_method(key, *args)
      end
  end
  raise NoMethodError, "undefined method `#{key}' for #{self}"
end

Instance Attribute Details

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/activeldap/base.rb', line 92

def logger
  @logger
end

#may ⇒ Object (readonly)

Parsed schema structures



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# File 'lib/activeldap/base.rb', line 91

def may
  @may
end

#must ⇒ Object (readonly)

Parsed schema structures



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# File 'lib/activeldap/base.rb', line 91

def must
  @must
end

Class Method Details

.base ⇒ Object

Make the return value the string that is your LDAP base



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# File 'lib/activeldap/base.rb', line 437

def Base.base
  'dc=example,dc=com'
end

.close ⇒ Object

Base.close This method deletes the LDAP connection object. This does NOT reset any overridden values from a Base.connect call.



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# File 'lib/activeldap/base.rb', line 256

def Base.close
  @@conn.unbind unless @@conn.nil?
  @@conn = nil
  # Make sure it is cleaned up
  ObjectSpace.garbage_collect
end

.connect(config = {}) ⇒ Object

Connect and bind to LDAP creating a class variable for use by all ActiveLDAP objects.

config

config must be a hash that may contain any of the following fields: :user, :password_block, :logger, :host, :port, :base, :bind_format, :try_sasl, :allow_anonymous :user specifies the username to bind with. :bind_format specifies the string to substitute the username into on bind. e.g. uid=%s,ou=People,dc=dataspill,dc=org. Overrides @@bind_format. :password_block specifies a Proc object that will yield a String to be used as the password when called. :logger specifies a preconfigured Log4r::Logger to be used for all logging :host overrides the configuration.rb @@host setting with the LDAP server hostname :port overrides the configuration.rb @@port setting for the LDAP server port :base overwrites Base.base - this affects EVERYTHING :try_sasl indicates that a SASL bind should be attempted when binding to the server (default: false) :allow_anonymous indicates that a true anonymous bind is allowed when trying to bind to the server (default: true)



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# File 'lib/activeldap/base.rb', line 178

def Base.connect(config={}) # :user, :password_block, :logger
  # Process config
  # Class options
  ## These will be replace by configuration.rb defaults if defined
  @@config = {}
  @@config[:host] = config[:host] || @@host
  @@config[:port] = config[:port] || @@port
  if config[:base]
    Base.class_eval <<-"end_eval"
      def Base.base
        '#{config[:base]}'
      end
    end_eval
  end
  @@config[:bind_format] = config[:bind_format] || @@bind_format

  @@logger = config[:logger] || nil
  # Setup default logger to console
  if @@logger.nil?
    @@logger = Log4r::Logger.new('activeldap')
    @@logger.level = Log4r::OFF
    Log4r::StderrOutputter.new 'console'
    @@logger.add('console')
  end

  # Method options
  user = nil
  password_block = nil
  @@config[:allow_anonymous] = true
  @@config[:try_sasl] = false

  @@config[:user] = config[:user] || user
  @@config[:allow_anonymous] = config[:allow_anonymous] if config.has_key? :allow_anonymous
  @@config[:try_sasl] = config[:try_sasl]
  @@config[:password_block] = config[:password_block] if config.has_key? :password_block

  # Setup bind credentials
  @@config[:user] = ENV['USER'] unless @@config[:user]

  # Connect to LDAP
  begin
    # SSL using START_TLS
    @@conn = LDAP::SSLConn.new(@@config[:host], @@config[:port], true)
  rescue
    @@logger.warn "Warning: Failed to connect using TLS!"
    begin
      @@logger.warn "Warning: Attempting SSL connection . . ."
      @@conn = LDAP::SSLConn.new(@@config[:host], @@config[:port], false)
      # HACK: Load the schema here because otherwise you can't tell if the
      # HACK: SSLConn is a real SSL connection.
      @@schema = @@conn.schema() if @@schema.nil?
    rescue
      @@logger.warn "Warning: Attempting unencrypted connection . . ."
      @@conn = LDAP::Conn.new(@@config[:host], @@config[:port])
    end
  end
  @@logger.debug "Connected to #{@@config[:host]}:#{@@config[:port]}."

  # Enforce LDAPv3
  @@conn.set_option(LDAP::LDAP_OPT_PROTOCOL_VERSION, 3)

  # Authenticate
  do_bind

  # Load Schema (if not straight SSL...)
  begin
    @@schema = @@conn.schema() if @@schema.nil?
  rescue => detail
    raise ConnectionError, "#{detail.exception} - LDAP connection failure, or server does not support schema queries."
  end

  # Cleanly return
  return true
end

.connection ⇒ Object

Return the LDAP connection object currently in use



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# File 'lib/activeldap/base.rb', line 264

def Base.connection
  return @@conn
end

.connection=(conn) ⇒ Object

Set the LDAP connection avoiding Base.connect or multiplexing connections



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# File 'lib/activeldap/base.rb', line 269

def Base.connection=(conn)
  @@conn = conn
end

.create_object(config = {}) ⇒ Object

Driver generator

TODO add type checking This let’s you call this method to create top-level extension object. This is really just a proof of concept and has not truly useful purpose. example: Base.create_object(:class => “user”, :dnattr => “uid”, :classes => [‘top’])

Raises:

  • (TypeError) 


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# File 'lib/activeldap/base.rb', line 106

def Base.create_object(config={})
  # Just upcase the first letter of the new class name
  str = config[:class]
  class_name = str[0].chr.upcase + str[1..-1]

  attr = config[:dnattr] # "uid"
  prefix = config[:base] # "ou=People"
  # [ 'top', 'posixAccount' ]
  classes_array = config[:classes] || []
  # [ [ :groups, {:class_name => "Group", :foreign_key => "memberUid"}] ]
  belongs_to_array = config[:belongs_to] || []
  # [ [ :members, {:class_name => "User", :foreign_key => "uid", :local_key => "memberUid"}] ]
  has_many_array = config[:has_many] || []

  raise TypeError, ":objectclasses must be an array" unless classes_array.respond_to? :size
  raise TypeError, ":belongs_to must be an array" unless belongs_to_array.respond_to? :size
  raise TypeError, ":has_many must be an array" unless has_many_array.respond_to? :size

  # Build classes array
  classes = '['
  classes_array.map! {|x| x = "'#{x}'"}
  classes << classes_array.join(', ')
  classes << ']'

  # Build belongs_to
  belongs_to = []
  if belongs_to_array.size > 0
    belongs_to_array.each do |bt|
      line = [ "belongs_to :#{bt[0]}" ]
      bt[1].keys.each do |key|
        line << ":#{key} => '#{bt[1][key]}'"
      end
      belongs_to << line.join(', ')
    end
  end

  # Build has_many
  has_many = []
  if has_many_array.size > 0
    has_many_array.each do |hm|
      line = [ "has_many :#{hm[0]}" ]
      hm[1].keys.each do |key|
        line << ":#{key} => '#{hm[1][key]}'"
      end
      has_many << line.join(', ')
    end
  end

  self.class.module_eval <<-"end_eval"
    class ::#{class_name} < ActiveLDAP::Base
      ldap_mapping :dnattr => "#{attr}, :prefix => "#{prefix}", :classes => "#{classes}"
      #{belongs_to.join("\n")}
      #{has_many.join("\n")}
    end
  end_eval
end

.dnattr ⇒ Object

Base.dnattr

This is a placeholder for the class method that will be overridden on calling ldap_mapping in a subclass. Using a class method allows for clean inheritance from classes that already have a ldap_mapping.



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# File 'lib/activeldap/base.rb', line 447

def Base.dnattr
 ''
end

.required_classes ⇒ Object

This is optionally set to the array of objectClass names that are minimally required for EVERY object on your LDAP server. If you don’t want one, set this to [].



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# File 'lib/activeldap/base.rb', line 461

def Base.required_classes
  []
end

.schema ⇒ Object

Return the schema object



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# File 'lib/activeldap/base.rb', line 274

def Base.schema
  @@schema
end

.search(config = {}) ⇒ Object

search

Wraps Ruby/LDAP connection.search to make it easier to search for specific data without cracking open Base.connection



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# File 'lib/activeldap/base.rb', line 282

def Base.search(config={})
  unless Base.connection
    if @@config
      ActiveLDAP::Base.connect(@@config)
    else
      ActiveLDAP::Base.connect
    end
  end

  config[:filter] = 'objectClass=*' unless config.has_key? :filter
  config[:attrs] = [] unless config.has_key? :attrs
  config[:scope] = LDAP::LDAP_SCOPE_SUBTREE unless config.has_key? :scope
  config[:base] = base() unless config.has_key? :base

  values = []
  config[:attrs] = config[:attrs].to_a # just in case

  begin
    @@conn.search(config[:base], config[:scope], config[:filter], config[:attrs])  do |m|
      res = {}
      res['dn'] = [m.dn.dup] # For consistency with the below
      m.attrs.each do |attr|
        if config[:attrs].member? attr or config[:attrs].empty?
          res[attr] = m.vals(attr).dup
        end
      end
      values.push(res)
    end
  rescue RuntimeError => detail
    @@logger.debug "No matches for #{config[:filter]} and attrs #{config[:attrs]}"
    # Do nothing on failure
  end
  return values
end

Instance Method Details

#__methods ⇒ Object

Add available attributes to the methods



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# File 'lib/activeldap/base.rb', line 840

alias_method :__methods, :methods

#attributes ⇒ Object

attributes

Return attribute methods so that a program can determine available attributes dynamically without schema awareness



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# File 'lib/activeldap/base.rb', line 563

def attributes
  @@logger.debug("stub: attributes called")
  send(:apply_objectclass, @data['objectClass']) if @data['objectClass'] != @last_oc
  return @attr_methods.keys
end

#delete ⇒ Object

delete

Delete this entry from LDAP



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# File 'lib/activeldap/base.rb', line 630

def delete
  @@logger.debug("stub: delete called")
  begin
    @@conn.delete(@dn)
    @exists = false
  rescue LDAP::ResultError => detail
    raise DeleteError, "Failed to delete LDAP entry: '#{@dn}'"
  end
end

#dn ⇒ Object

dn

Return the authoritative dn



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# File 'lib/activeldap/base.rb', line 580

def dn
  @@logger.debug("stub: dn called")
  return @dn.dup
end

#exists? ⇒ Boolean

exists?

Return whether the entry exists in LDAP or not

Returns:

  • (Boolean) 


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# File 'lib/activeldap/base.rb', line 572

def exists?
  @@logger.debug("stub: exists? called")
  return @exists
end

#methods ⇒ Object 



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# File 'lib/activeldap/base.rb', line 841

def methods
  return __methods + attributes()
end

#validate ⇒ Object

validate

Basic validation:

  • Verify that every ‘MUST’ specified in the schema has a value defined

  • Enforcement of undefined attributes is handled in the objectClass= method

Must call enforce_types() first before enforcement can be guaranteed



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# File 'lib/activeldap/base.rb', line 591

def validate
  @@logger.debug("stub: validate called")
  # Clean up attr values, etc
  send(:enforce_types)

  # Validate objectclass settings
  @data['objectClass'].each do |klass|
    unless klass.class == String
      raise TypeError, "Value in objectClass array is not a String. (#{klass.class}:#{klass.inspect})"
    end
    unless Base.schema.names("objectClasses").member? klass
      raise ObjectClassError, "objectClass '#{klass}' unknown to LDAP server."
    end
  end

  # make sure this doesn't drop any of the required objectclasses
  required_classes().each do |oc|
    unless @data['objectClass'].member? oc.to_s
      raise ObjectClassError, "'#{oc}' must be a defined objectClass for class '#{self.class}' as set in the ldap_mapping"
    end
  end

  # Make sure all MUST attributes have a value
  @data['objectClass'].each do |objc|
    @must.each do |req_attr|
      deref = @attr_methods[req_attr]
      if @data[deref] == []
        raise AttributeEmpty,
          "objectClass '#{objc}' requires attribute '#{Base.schema.attribute_aliases(req_attr).join(', ')}'"
      end
    end
  end
  @@logger.debug("stub: validate finished")
end

#write ⇒ Object

write

Write and validate this object into LDAP either adding or replacing attributes TODO: Binary data support TODO: Relative DN support



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# File 'lib/activeldap/base.rb', line 647

def write
  @@logger.debug("stub: write called")
  # Validate against the objectClass requirements
  validate

  # Put all changes into one change entry to ensure
  # automatic rollback upon failure.
  entry = []


  # Expand subtypes to real ldap_data entries
  # We can't reuse @ldap_data because an exception would leave
  # an object in an unknown state
  @@logger.debug("#write: dup'ing @ldap_data")
  ldap_data = @ldap_data.dup
  @@logger.debug("#write: dup finished @ldap_data")
  @@logger.debug("#write: expanding subtypes in @ldap_data")
  ldap_data.keys.each do |key|
    ldap_data[key].each do |value|
      if value.class == Hash
        suffix, real_value = extract_subtypes(value)
        if ldap_data.has_key? key + suffix
          ldap_data[key + suffix].push(real_value)
        else
          ldap_data[key + suffix] = real_value
        end
        ldap_data[key].delete(value)
      end
    end
  end
  @@logger.debug("#write: subtypes expanded for @ldap_data")

  # Expand subtypes to real data entries, but leave @data alone
  @@logger.debug("#write: dup'ing @data")
  data = @data.dup
  @@logger.debug("#write: finished dup'ing @data")
  @@logger.debug("#write: expanding subtypes for @data")
  data.keys.each do |key|
    data[key].each do |value|
      if value.class == Hash
        suffix, real_value = extract_subtypes(value)
        if data.has_key? key + suffix
          data[key + suffix].push(real_value)
        else
          data[key + suffix] = real_value
        end
        data[key].delete(value)
      end
    end
  end
  @@logger.debug("#write: subtypes expanded for @data")


  if @exists
    # Cycle through all attrs to determine action
    action = {}

    replaceable = []
    # Now that all the subtypes will be treated as unique attributes
    # we can see what's changed and add anything that is brand-spankin'
    # new.
    @@logger.debug("#write: traversing ldap_data determining replaces and deletes")
    ldap_data.each do |pair|
      suffix = ''
      binary = 0

      name, *suffix_a = pair[0].split(/;/)
      suffix = ';'+ suffix_a.join(';') if suffix_a.size > 0
      name = @attr_methods[name]
      name = pair[0].split(/;/)[0] if name.nil? # for objectClass, or removed vals
      value = data[name+suffix]

      # Detect subtypes and account for them
      binary = LDAP::LDAP_MOD_BVALUES if Base.schema.binary? name

      replaceable.push(name+suffix)
      if pair[1] != value
        # Create mod entries
        if not value.empty?
          # Ditched delete then replace because attribs with no equality match rules
          # will fails
          @@logger.debug("updating attribute of existing entry:  #{name+suffix}: #{value.inspect}")
          entry.push(LDAP.mod(LDAP::LDAP_MOD_REPLACE|binary, name + suffix, value))
        else
          # Since some types do not have equality matching rules, delete doesn't work
          # Replacing with nothing is equivalent.
          @@logger.debug("removing attribute from existing entry:  #{name+suffix}")
          entry.push(LDAP.mod(LDAP::LDAP_MOD_REPLACE|binary, name + suffix, []))
        end
      end
    end
    @@logger.debug("#write: finished traversing ldap_data")
    @@logger.debug("#write: traversing data determining adds")
    data.each do |pair|
      suffix = ''
      binary = 0

      name, *suffix_a = pair[0].split(/;/)
      suffix = ';' + suffix_a.join(';') if suffix_a.size > 0
      name = @attr_methods[name]
      name = pair[0].split(/;/)[0] if name.nil? # for obj class or removed vals
      value = pair[1]

      if not replaceable.member? name+suffix
        # Detect subtypes and account for them
        binary = LDAP::LDAP_MOD_BVALUES if Base.schema.binary? name
        @@logger.debug("adding attribute to existing entry:  #{name+suffix}: #{value.inspect}")
        # REPLACE will function like ADD, but doesn't hit EQUALITY problems
        # TODO: Added equality(attr) to Schema2
        entry.push(LDAP.mod(LDAP::LDAP_MOD_REPLACE|binary, name + suffix, value)) unless value.empty?
      end
    end
    @@logger.debug("#write: traversing data complete")
    begin
      @@logger.debug("#write: modifying #{@dn}")
      @@conn.modify(@dn, entry)
      @@logger.debug("#write: modify successful")
    rescue => detail
      raise WriteError, "Could not update LDAP entry: #{detail}"
    end
  else # add everything!
    @@logger.debug("#write: adding all attribute value pairs")
    @@logger.debug("#write: adding #{@attr_methods[dnattr()].inspect} = #{data[@attr_methods[dnattr()]].inspect}")
    entry.push(LDAP.mod(LDAP::LDAP_MOD_ADD, @attr_methods[dnattr()], 
      data[@attr_methods[dnattr()]]))
    @@logger.debug("#write: adding objectClass = #{data[@attr_methods['objectClass']].inspect}")
    entry.push(LDAP.mod(LDAP::LDAP_MOD_ADD, 'objectClass', 
      data[@attr_methods['objectClass']]))
    data.each do |pair|
      if pair[1].size > 0  and pair[0] != 'objectClass' and pair[0] != @attr_methods[dnattr()]
        # Detect subtypes and account for them
        if Base.schema.binary? pair[0].split(/;/)[0]
          binary = LDAP::LDAP_MOD_BVALUES 
        else
          binary = 0
        end
        @@logger.debug("adding attribute to new entry:  #{pair[0].inspect}: #{pair[1].inspect}")
        entry.push(LDAP.mod(LDAP::LDAP_MOD_ADD|binary, pair[0], pair[1]))
      end
    end
    begin
      @@logger.debug("#write: adding #{@dn}")
      @@conn.add(@dn, entry)
      @@logger.debug("#write: add successful")
      @exists = true
    rescue LDAP::ResultError => detail
      raise WriteError, "Could not add LDAP entry[#{Base.connection.err2string(Base.connection.err)}]: #{detail}"
    end
  end
  @@logger.debug("#write: resetting @ldap_data to a dup of @data")
  @ldap_data = @data.dup
  @@logger.debug("#write: @ldap_data reset complete")
  @@logger.debug("stub: write exitted")
end