257 lines
8.1 KiB
Ruby
257 lines
8.1 KiB
Ruby
# -*- ruby encoding: utf-8 -*-
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require 'ostruct'
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##
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# Defines the Protocol Data Unit (PDU) for LDAP. An LDAP PDU always looks
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# like a BER SEQUENCE with at least two elements: an INTEGER message ID
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# number and an application-specific SEQUENCE. Some LDAPv3 packets also
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# include an optional third element, a sequence of "controls" (see RFC 2251
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# section 4.1.12 for more information).
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#
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# The application-specific tag in the sequence tells us what kind of packet
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# it is, and each kind has its own format, defined in RFC-1777.
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#
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# Observe that many clients (such as ldapsearch) do not necessarily enforce
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# the expected application tags on received protocol packets. This
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# implementation does interpret the RFC strictly in this regard, and it
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# remains to be seen whether there are servers out there that will not work
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# well with our approach.
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#
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# Currently, we only support controls on SearchResult.
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class Net::LDAP::PDU
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class Error < RuntimeError; end
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##
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# This message packet is a bind request.
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BindRequest = 0
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BindResult = 1
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UnbindRequest = 2
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SearchRequest = 3
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SearchReturnedData = 4
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SearchResult = 5
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ModifyResponse = 7
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AddResponse = 9
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DeleteResponse = 11
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ModifyRDNResponse = 13
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SearchResultReferral = 19
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ExtendedRequest = 23
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ExtendedResponse = 24
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##
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# The LDAP packet message ID.
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attr_reader :message_id
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alias_method :msg_id, :message_id
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##
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# The application protocol format tag.
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attr_reader :app_tag
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attr_reader :search_entry
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attr_reader :search_referrals
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attr_reader :search_parameters
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attr_reader :bind_parameters
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##
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# Returns RFC-2251 Controls if any.
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attr_reader :ldap_controls
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alias_method :result_controls, :ldap_controls
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# Messy. Does this functionality belong somewhere else?
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def initialize(ber_object)
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begin
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@message_id = ber_object[0].to_i
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# Grab the bottom five bits of the identifier so we know which type of
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# PDU this is.
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#
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# This is safe enough in LDAP-land, but it is recommended that other
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# approaches be taken for other protocols in the case that there's an
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# app-specific tag that has both primitive and constructed forms.
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@app_tag = ber_object[1].ber_identifier & 0x1f
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@ldap_controls = []
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rescue Exception => ex
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raise Net::LDAP::PDU::Error, "LDAP PDU Format Error: #{ex.message}"
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end
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case @app_tag
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when BindResult
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parse_bind_response(ber_object[1])
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when SearchReturnedData
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parse_search_return(ber_object[1])
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when SearchResultReferral
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parse_search_referral(ber_object[1])
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when SearchResult
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parse_ldap_result(ber_object[1])
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when ModifyResponse
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parse_ldap_result(ber_object[1])
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when AddResponse
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parse_ldap_result(ber_object[1])
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when DeleteResponse
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parse_ldap_result(ber_object[1])
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when ModifyRDNResponse
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parse_ldap_result(ber_object[1])
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when SearchRequest
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parse_ldap_search_request(ber_object[1])
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when BindRequest
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parse_bind_request(ber_object[1])
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when UnbindRequest
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parse_unbind_request(ber_object[1])
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when ExtendedResponse
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parse_ldap_result(ber_object[1])
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else
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raise LdapPduError.new("unknown pdu-type: #{@app_tag}")
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end
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parse_controls(ber_object[2]) if ber_object[2]
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end
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##
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# Returns a hash which (usually) defines the members :resultCode,
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# :errorMessage, and :matchedDN. These values come directly from an LDAP
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# response packet returned by the remote peer. Also see #result_code.
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def result
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@ldap_result || {}
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end
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##
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# This returns an LDAP result code taken from the PDU, but it will be nil
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# if there wasn't a result code. That can easily happen depending on the
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# type of packet.
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def result_code(code = :resultCode)
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@ldap_result and @ldap_result[code]
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end
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##
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# Return serverSaslCreds, which are only present in BindResponse packets.
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#--
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# Messy. Does this functionality belong somewhere else? We ought to
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# refactor the accessors of this class before they get any kludgier.
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def result_server_sasl_creds
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@ldap_result && @ldap_result[:serverSaslCreds]
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end
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def parse_ldap_result(sequence)
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sequence.length >= 3 or raise Net::LDAP::PDU::Error, "Invalid LDAP result length."
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@ldap_result = {
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:resultCode => sequence[0],
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:matchedDN => sequence[1],
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:errorMessage => sequence[2]
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}
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end
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private :parse_ldap_result
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##
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# A Bind Response may have an additional field, ID [7], serverSaslCreds,
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# per RFC 2251 pgh 4.2.3.
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def parse_bind_response(sequence)
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sequence.length >= 3 or raise Net::LDAP::PDU::Error, "Invalid LDAP Bind Response length."
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parse_ldap_result(sequence)
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@ldap_result[:serverSaslCreds] = sequence[3] if sequence.length >= 4
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@ldap_result
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end
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private :parse_bind_response
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# Definition from RFC 1777 (we're handling application-4 here).
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#
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# Search Response ::=
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# CHOICE {
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# entry [APPLICATION 4] SEQUENCE {
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# objectName LDAPDN,
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# attributes SEQUENCE OF SEQUENCE {
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# AttributeType,
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# SET OF AttributeValue
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# }
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# },
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# resultCode [APPLICATION 5] LDAPResult
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# }
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#
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# We concoct a search response that is a hash of the returned attribute
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# values.
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#
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# NOW OBSERVE CAREFULLY: WE ARE DOWNCASING THE RETURNED ATTRIBUTE NAMES.
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#
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# This is to make them more predictable for user programs, but it may not
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# be a good idea. Maybe this should be configurable.
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def parse_search_return(sequence)
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sequence.length >= 2 or raise Net::LDAP::PDU::Error, "Invalid Search Response length."
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@search_entry = Net::LDAP::Entry.new(sequence[0])
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sequence[1].each { |seq| @search_entry[seq[0]] = seq[1] }
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end
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private :parse_search_return
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##
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# A search referral is a sequence of one or more LDAP URIs. Any number of
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# search-referral replies can be returned by the server, interspersed with
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# normal replies in any order.
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#--
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# Until I can think of a better way to do this, we'll return the referrals
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# as an array. It'll be up to higher-level handlers to expose something
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# reasonable to the client.
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def parse_search_referral(uris)
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@search_referrals = uris
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end
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private :parse_search_referral
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##
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# Per RFC 2251, an LDAP "control" is a sequence of tuples, each consisting
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# of an OID, a boolean criticality flag defaulting FALSE, and an OPTIONAL
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# Octet String. If only two fields are given, the second one may be either
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# criticality or data, since criticality has a default value. Someday we
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# may want to come back here and add support for some of more-widely used
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# controls. RFC-2696 is a good example.
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def parse_controls(sequence)
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@ldap_controls = sequence.map do |control|
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o = OpenStruct.new
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o.oid, o.criticality, o.value = control[0], control[1], control[2]
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if o.criticality and o.criticality.is_a?(String)
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o.value = o.criticality
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o.criticality = false
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end
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o
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end
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end
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private :parse_controls
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# (provisional, must document)
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def parse_ldap_search_request(sequence)
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s = OpenStruct.new
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s.base_object, s.scope, s.deref_aliases, s.size_limit, s.time_limit,
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s.types_only, s.filter, s.attributes = sequence
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@search_parameters = s
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end
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private :parse_ldap_search_request
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# (provisional, must document)
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def parse_bind_request sequence
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s = OpenStruct.new
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s.version, s.name, s.authentication = sequence
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@bind_parameters = s
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end
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private :parse_bind_request
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# (provisional, must document)
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# UnbindRequest has no content so this is a no-op.
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def parse_unbind_request(sequence)
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nil
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end
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private :parse_unbind_request
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end
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module Net
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##
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# Handle renamed constants Net::LdapPdu (Net::LDAP::PDU) and
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# Net::LdapPduError (Net::LDAP::PDU::Error).
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def self.const_missing(name) #:nodoc:
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case name.to_s
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when "LdapPdu"
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warn "Net::#{name} has been deprecated. Use Net::LDAP::PDU instead."
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Net::LDAP::PDU
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when "LdapPduError"
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warn "Net::#{name} has been deprecated. Use Net::LDAP::PDU::Error instead."
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Net::LDAP::PDU::Error
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when 'LDAP'
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else
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super
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end
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end
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end # module Net
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