Class: Net::LDAP::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/net/ldap.rb

Overview

This is a private class used internally by the library. It should not be called by user code.

Defined Under Namespace

Modules: GetbyteForSSLSocket

Constant Summary collapse

LdapVersion =

:nodoc:

3
MaxSaslChallenges = 
10

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(server) {|_self| ... } ⇒ Connection

Returns a new instance of Connection.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/net/ldap.rb', line 1105

def initialize(server)
  begin
    @conn = TCPSocket.new(server[:host], server[:port])
  rescue SocketError
    raise Net::LDAP::LdapError, "No such address or other socket error."
  rescue Errno::ECONNREFUSED
    raise Net::LDAP::LdapError, "Server #{server[:host]} refused connection on port #{server[:port]}."
  end

  if server[:encryption]
    setup_encryption server[:encryption]
  end

  yield self if block_given?
end

Class Method Details

.wrap_with_ssl(io) ⇒ Object

Raises:



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# File 'lib/net/ldap.rb', line 1127

def self.wrap_with_ssl(io)
  raise Net::LDAP::LdapError, "OpenSSL is unavailable" unless Net::LDAP::HasOpenSSL
  ctx = OpenSSL::SSL::SSLContext.new
  conn = OpenSSL::SSL::SSLSocket.new(io, ctx)
  conn.connect
  conn.sync_close = true

  conn.extend(GetbyteForSSLSocket) unless conn.respond_to?(:getbyte)

  conn
end

Instance Method Details

#add(args) ⇒ Object

– TODO: need to support a time limit, in case the server fails to respond. Unlike other operation-methods in this class, we return a result hash rather than a simple result number. This is experimental, and eventually we’ll want to do this with all the others. The point is to have access to the error message and the matched-DN returned by the server. ++



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# File 'lib/net/ldap.rb', line 1492

def add(args)
  add_dn = args[:dn] or raise Net::LDAP::LdapError, "Unable to add empty DN"
  add_attrs = []
  a = args[:attributes] and a.each { |k, v|
    add_attrs << [ k.to_s.to_ber, Array(v).map { |m| m.to_ber}.to_ber_set ].to_ber_sequence
  }

  request = [add_dn.to_ber, add_attrs.to_ber_sequence].to_ber_appsequence(8)
  pkt = [next_msgid.to_ber, request].to_ber_sequence
  @conn.write pkt

  (be = @conn.read_ber(Net::LDAP::AsnSyntax)) && (pdu = Net::LDAP::PDU.new(be)) && (pdu.app_tag == 9) or raise Net::LDAP::LdapError, "response missing or invalid"
  pdu.result_code
end

#bind(auth) ⇒ Object 



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# File 'lib/net/ldap.rb', line 1205

def bind(auth)
  meth = auth[:method]
  if [:simple, :anonymous, :anon].include?(meth)
    bind_simple auth
  elsif meth == :sasl
    bind_sasl(auth)
  elsif meth == :gss_spnego
    bind_gss_spnego(auth)
  else
    raise Net::LDAP::LdapError, "Unsupported auth method (#{meth})"
  end
end

#bind_simple(auth) ⇒ Object

– Implements a simple user/psw authentication. Accessed by calling #bind with a method of :simple or :anonymous. ++

Raises:



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# File 'lib/net/ldap.rb', line 1222

def bind_simple(auth)
  user, psw = if auth[:method] == :simple
                [auth[:username] || auth[:dn], auth[:password]]
              else
                ["", ""]
              end

  raise Net::LDAP::LdapError, "Invalid binding information" unless (user && psw)

  msgid = next_msgid.to_ber
  request = [LdapVersion.to_ber, user.to_ber,
    psw.to_ber_contextspecific(0)].to_ber_appsequence(0)
  request_pkt = [msgid, request].to_ber_sequence
  @conn.write request_pkt

  (be = @conn.read_ber(Net::LDAP::AsnSyntax) and pdu = Net::LDAP::PDU.new(be)) or raise Net::LDAP::LdapError, "no bind result"

  pdu.result_code
end

#close ⇒ Object

– This is provided as a convenience method to make sure a connection object gets closed without waiting for a GC to happen. Clients shouldn’t have to call it, but perhaps it will come in handy someday. ++



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# File 'lib/net/ldap.rb', line 1195

def close
  @conn.close
  @conn = nil
end

#delete(args) ⇒ Object

– TODO, need to support a time limit, in case the server fails to respond. ++



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# File 'lib/net/ldap.rb', line 1529

def delete(args)
  dn = args[:dn] or raise "Unable to delete empty DN"

  request = dn.to_s.to_ber_application_string(10)
  pkt = [next_msgid.to_ber, request].to_ber_sequence
  @conn.write pkt

  (be = @conn.read_ber(Net::LDAP::AsnSyntax)) && (pdu = Net::LDAP::PDU.new(be)) && (pdu.app_tag == 11) or raise Net::LDAP::LdapError, "response missing or invalid"
  pdu.result_code
end

#modify(args) ⇒ Object

– TODO: need to support a time limit, in case the server fails to respond. TODO: We’re throwing an exception here on empty DN. Should return a proper error instead, probaby from farther up the chain. TODO: If the user specifies a bogus opcode, we’ll throw a confusing error here (“to_ber_enumerated is not defined on nil”). ++



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# File 'lib/net/ldap.rb', line 1466

def modify(args)
  modify_dn = args[:dn] or raise "Unable to modify empty DN"
  modify_ops = []
  a = args[:operations] and a.each { |op, attr, values|
    # TODO, fix the following line, which gives a bogus error if the
    # opcode is invalid.
    op_1 = { :add => 0, :delete => 1, :replace => 2 }[op.to_sym].to_ber_enumerated
    modify_ops << [op_1, [attr.to_s.to_ber, Array(values).map { |v| v.to_ber}.to_ber_set].to_ber_sequence].to_ber_sequence
  }

  request = [modify_dn.to_ber,
    modify_ops.to_ber_sequence].to_ber_appsequence(6)
  pkt = [next_msgid.to_ber, request].to_ber_sequence
  @conn.write pkt

  (be = @conn.read_ber(Net::LDAP::AsnSyntax)) && (pdu = Net::LDAP::PDU.new(be)) && (pdu.app_tag == 7) or raise Net::LDAP::LdapError, "response missing or invalid"
  pdu.result_code
end

#next_msgid ⇒ Object 



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# File 'lib/net/ldap.rb', line 1200

def next_msgid
  @msgid ||= 0
  @msgid += 1
end

#rename(args) ⇒ Object

– TODO: need to support a time limit, in case the server fails to respond. ++



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# File 'lib/net/ldap.rb', line 1510

def rename args
  old_dn = args[:olddn] or raise "Unable to rename empty DN"
  new_rdn = args[:newrdn] or raise "Unable to rename to empty RDN"
  delete_attrs = args[:delete_attributes] ? true : false
new_superior = args[:new_superior]

request = [old_dn.to_ber, new_rdn.to_ber, delete_attrs.to_ber]
request << new_superior.to_ber unless new_superior == nil
	
  pkt = [next_msgid.to_ber, request.to_ber_appsequence(12)].to_ber_sequence
  @conn.write pkt

  (be = @conn.read_ber(AsnSyntax)) && (pdu = LdapPdu.new( be )) && (pdu.app_tag == 13) or raise LdapError.new( "response missing or invalid" )
  pdu.result_code
end

#search(args = {}) ⇒ Object

– Alternate implementation, this yields each search entry to the caller as it are received.

TODO: certain search parameters are hardcoded. TODO: if we mis-parse the server results or the results are wrong, we can block forever. That’s because we keep reading results until we get a type-5 packet, which might never come. We need to support the time-limit in the protocol. ++

Raises:



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# File 'lib/net/ldap.rb', line 1327

def search(args = {})
  search_filter = (args && args[:filter]) || 
    Net::LDAP::Filter.eq("objectclass", "*")
  search_filter = Net::LDAP::Filter.construct(search_filter) if search_filter.is_a?(String)
  search_base = (args && args[:base]) || "dc=example, dc=com"
  search_attributes = ((args && args[:attributes]) || []).map { |attr| attr.to_s.to_ber}
  return_referrals = args && args[:return_referrals] == true
  sizelimit = (args && args[:size].to_i) || 0
  raise Net::LDAP::LdapError, "invalid search-size" unless sizelimit >= 0
  paged_searches_supported = (args && args[:paged_searches_supported])

  attributes_only = (args and args[:attributes_only] == true)
  scope = args[:scope] || Net::LDAP::SearchScope_WholeSubtree
  raise Net::LDAP::LdapError, "invalid search scope" unless Net::LDAP::SearchScopes.include?(scope)

  # An interesting value for the size limit would be close to A/D's
  # built-in page limit of 1000 records, but openLDAP newer than version
  # 2.2.0 chokes on anything bigger than 126. You get a silent error that
  # is easily visible by running slapd in debug mode. Go figure.
  #
  # Changed this around 06Sep06 to support a caller-specified search-size
  # limit. Because we ALWAYS do paged searches, we have to work around the
  # problem that it's not legal to specify a "normal" sizelimit (in the
  # body of the search request) that is larger than the page size we're
  # requesting. Unfortunately, I have the feeling that this will break
  # with LDAP servers that don't support paged searches!!!
  #
  # (Because we pass zero as the sizelimit on search rounds when the
  # remaining limit is larger than our max page size of 126. In these
  # cases, I think the caller's search limit will be ignored!)
  #
  # CONFIRMED: This code doesn't work on LDAPs that don't support paged
  # searches when the size limit is larger than 126. We're going to have
  # to do a root-DSE record search and not do a paged search if the LDAP
  # doesn't support it. Yuck.
  rfc2696_cookie = [126, ""]
  result_code = 0
  n_results = 0

  loop {
    # should collect this into a private helper to clarify the structure
    query_limit = 0
    if sizelimit > 0
      if paged_searches_supported
        query_limit = (((sizelimit - n_results) < 126) ? (sizelimit -
                                                          n_results) : 0)
      else
        query_limit = sizelimit
      end
    end

    request = [
      search_base.to_ber,
      scope.to_ber_enumerated,
      0.to_ber_enumerated,
      query_limit.to_ber, # size limit
      0.to_ber,
      attributes_only.to_ber,
      search_filter.to_ber,
      search_attributes.to_ber_sequence
    ].to_ber_appsequence(3)

    controls = [
      [
        Net::LDAP::LdapControls::PagedResults.to_ber,
        # Criticality MUST be false to interoperate with normal LDAPs.
        false.to_ber,
        rfc2696_cookie.map{ |v| v.to_ber}.to_ber_sequence.to_s.to_ber
      ].to_ber_sequence
    ].to_ber_contextspecific(0)

    pkt = [next_msgid.to_ber, request, controls].to_ber_sequence
    @conn.write pkt

    result_code = 0
    controls = []

    while (be = @conn.read_ber(Net::LDAP::AsnSyntax)) && (pdu = Net::LDAP::PDU.new(be))
      case pdu.app_tag
      when 4 # search-data
        n_results += 1
        yield pdu.search_entry if block_given?
      when 19 # search-referral
        if return_referrals
          if block_given?
            se = Net::LDAP::Entry.new
            se[:search_referrals] = (pdu.search_referrals || [])
            yield se
          end
        end
      when 5 # search-result
        result_code = pdu.result_code
        controls = pdu.result_controls
        break
      else
        raise Net::LDAP::LdapError, "invalid response-type in search: #{pdu.app_tag}"
      end
    end

    # When we get here, we have seen a type-5 response. If there is no
    # error AND there is an RFC-2696 cookie, then query again for the next
    # page of results. If not, we're done. Don't screw this up or we'll
    # break every search we do.
    #
    # Noticed 02Sep06, look at the read_ber call in this loop, shouldn't
    # that have a parameter of AsnSyntax? Does this just accidentally
    # work? According to RFC-2696, the value expected in this position is
    # of type OCTET STRING, covered in the default syntax supported by
    # read_ber, so I guess we're ok.
    more_pages = false
    if result_code == 0 and controls
      controls.each do |c|
        if c.oid == Net::LDAP::LdapControls::PagedResults
          # just in case some bogus server sends us more than 1 of these.
          more_pages = false
          if c.value and c.value.length > 0
            cookie = c.value.read_ber[1]
            if cookie and cookie.length > 0
              rfc2696_cookie[1] = cookie
              more_pages = true
            end
          end
        end
      end
    end

    break unless more_pages
  } # loop

  result_code
end

#setup_encryption(args) ⇒ Object

– Helper method called only from new, and only after we have a successfully-opened @conn instance variable, which is a TCP connection. Depending on the received arguments, we establish SSL, potentially replacing the value of @conn accordingly. Don’t generate any errors here if no encryption is requested. DO raise Net::LDAP::LdapError objects if encryption is requested and we have trouble setting it up. That includes if OpenSSL is not set up on the machine. (Question: how does the Ruby OpenSSL wrapper react in that case?) DO NOT filter exceptions raised by the OpenSSL library. Let them pass back to the user. That should make it easier for us to debug the problem reports. Presumably (hopefully?) that will also produce recognizable errors if someone tries to use this on a machine without OpenSSL.

The simple_tls method is intended as the simplest, stupidest, easiest solution for people who want nothing more than encrypted comms with the LDAP server. It doesn’t do any server-cert validation and requires nothing in the way of key files and root-cert files, etc etc. OBSERVE: WE REPLACE the value of @conn, which is presumed to be a connected TCPSocket object.

The start_tls method is supported by many servers over the standard LDAP port. It does not require an alternative port for encrypted communications, as with simple_tls. Thanks for Kouhei Sutou for generously contributing the :start_tls path. ++



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# File 'lib/net/ldap.rb', line 1165

def setup_encryption(args)
  case args[:method]
  when :simple_tls
    @conn = self.class.wrap_with_ssl(@conn)
    # additional branches requiring server validation and peer certs, etc.
    # go here.
  when :start_tls
    msgid = next_msgid.to_ber
    request = [Net::LDAP::StartTlsOid.to_ber].to_ber_appsequence(Net::LDAP::PDU::ExtendedRequest)
    request_pkt = [msgid, request].to_ber_sequence
    @conn.write request_pkt
    be = @conn.read_ber(Net::LDAP::AsnSyntax)
    raise Net::LDAP::LdapError, "no start_tls result" if be.nil?
    pdu = Net::LDAP::PDU.new(be)
    raise Net::LDAP::LdapError, "no start_tls result" if pdu.nil?
    if pdu.result_code.zero?
      @conn = self.class.wrap_with_ssl(@conn)
    else
      raise Net::LDAP::LdapError, "start_tls failed: #{pdu.result_code}"
    end
  else
    raise Net::LDAP::LdapError, "unsupported encryption method #{args[:method]}"
  end
end