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.

Constant Summary collapse

LdapVersion =

:nodoc:

3

Instance Method Summary collapse

Constructor Details

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

– initialize

Yields:

  • (_self)

Yield Parameters:



959
960
961
962
963
964
965
966
967
968
969
970
971
 
# File 'lib/net/ldap.rb', line 959

def initialize server
  begin
    @conn = TCPsocket.new( server[:host], server[:port] )
  rescue
    raise LdapError.new( "no connection to server" )
  end

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

  yield self if block_given?
end

Instance Method Details

#add(args) ⇒ Object

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



1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
 
# File 'lib/net/ldap.rb', line 1196

def add args
  add_dn = args[:dn] or raise LdapError.new("Unable to add empty DN")
  add_attrs = []
  a = args[:attributes] and a.each {|k,v|
    add_attrs << [ k.to_s.to_ber, v.to_a.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(AsnSyntax)) && (pdu = LdapPdu.new( be )) && (pdu.app_tag == 9) or raise LdapError.new( "response missing or invalid" )
  pdu.result_code
end

#bind(auth) ⇒ Object

– bind

Raises:



1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
 
# File 'lib/net/ldap.rb', line 1032

def bind auth
  user,psw = case auth[:method]
  when :anonymous
    ["",""]
  when :simple
    [auth[:username] || auth[:dn], auth[:password]]
  end
  raise LdapError.new( "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(AsnSyntax) and pdu = Net::LdapPdu.new( be )) or raise LdapError.new( "no bind result" )
  pdu.result_code
end

#close ⇒ Object

– close 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.



1015
1016
1017
1018
 
# File 'lib/net/ldap.rb', line 1015

def close
  @conn.close
  @conn = nil
end

#delete(args) ⇒ Object

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



1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
 
# File 'lib/net/ldap.rb', line 1234

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(AsnSyntax)) && (pdu = LdapPdu.new( be )) && (pdu.app_tag == 11) or raise LdapError.new( "response missing or invalid" )
  pdu.result_code
end

#modify(args) ⇒ Object

– modify 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”).



1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
 
# File 'lib/net/ldap.rb', line 1173

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, values.to_a.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(AsnSyntax)) && (pdu = LdapPdu.new( be )) && (pdu.app_tag == 7) or raise LdapError.new( "response missing or invalid" )
  pdu.result_code
end

#next_msgid ⇒ Object

– next_msgid



1023
1024
1025
1026
 
# File 'lib/net/ldap.rb', line 1023

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

#rename(args) ⇒ Object

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



1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
 
# File 'lib/net/ldap.rb', line 1216

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

  request = [old_dn.to_ber, new_rdn.to_ber, delete_attrs.to_ber].to_ber_appsequence(12)
  pkt = [next_msgid.to_ber, request].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

– search 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. – WARNING: this code substantially recapitulates the searchx method.

02May06: Well, I added support for RFC-2696-style paged searches. This is used on all queries because the extension is marked non-critical. As far as I know, only A/D uses this, but it’s required for A/D. Otherwise you won’t get more than 1000 results back from a query. This implementation is kindof clunky and should probably be refactored. Also, is it my imagination, or are A/Ds the slowest directory servers ever???

Raises:



1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
 
# File 'lib/net/ldap.rb', line 1068

def search args = {}
  search_filter = (args && args[:filter]) || Filter.eq( "objectclass", "*" )
  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

  attributes_only = (args and args[:attributes_only] == true)
  scope = args[:scope] || Net::LDAP::SearchScope_WholeSubtree
  raise LdapError.new( "invalid search scope" ) unless 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.
  rfc2696_cookie = [126, ""]
  result_code = 0

  loop {
    # should collect this into a private helper to clarify the structure

    request = [
      search_base.to_ber,
      scope.to_ber_enumerated,
      0.to_ber_enumerated,
      0.to_ber,
      0.to_ber,
      attributes_only.to_ber,
      search_filter.to_ber,
      search_attributes.to_ber_sequence
    ].to_ber_appsequence(3)
  
    controls = [
      [
      LdapControls::PagedResults.to_ber,
      false.to_ber, # criticality MUST be false to interoperate with normal LDAPs.
      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(AsnSyntax)) && (pdu = LdapPdu.new( be ))
      case pdu.app_tag
      when 4 # search-data
        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
        #p pdu.referrals
      when 5 # search-result
        result_code = pdu.result_code
        controls = pdu.result_controls
        break
      else
        raise LdapError.new( "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.
    more_pages = false
    if result_code == 0 and controls
      controls.each do |c|
        if c.oid == LdapControls::PagedResults
          more_pages = false # just in case some bogus server sends us >1 of these.
          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 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 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.



995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
 
# File 'lib/net/ldap.rb', line 995

def setup_encryption args
  case args[:method]
  when :simple_tls
    raise LdapError.new("openssl unavailable") unless $net_ldap_openssl_available
    ctx = OpenSSL::SSL::SSLContext.new
    @conn = OpenSSL::SSL::SSLSocket.new(@conn, ctx)
    @conn.connect
    @conn.sync_close = true
  # additional branches requiring server validation and peer certs, etc. go here.
  else
    raise LdapError.new( "unsupported encryption method #{args[:method]}" )
  end
end