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84 lines
2.6 KiB
84 lines
2.6 KiB
// File contains Compare functionality
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//
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// https://tools.ietf.org/html/rfc4511
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//
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// CompareRequest ::= [APPLICATION 14] SEQUENCE {
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// entry LDAPDN,
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// ava AttributeValueAssertion }
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//
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// AttributeValueAssertion ::= SEQUENCE {
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// attributeDesc AttributeDescription,
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// assertionValue AssertionValue }
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//
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// AttributeDescription ::= LDAPString
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// -- Constrained to <attributedescription>
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// -- [RFC4512]
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//
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// AttributeValue ::= OCTET STRING
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//
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package ldap
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import (
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"errors"
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"fmt"
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"gopkg.in/asn1-ber.v1"
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)
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// Compare checks to see if the attribute of the dn matches value. Returns true if it does otherwise
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// false with any error that occurs if any.
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func (l *Conn) Compare(dn, attribute, value string) (bool, error) {
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packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
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packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
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request := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationCompareRequest, nil, "Compare Request")
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request.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, dn, "DN"))
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ava := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "AttributeValueAssertion")
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ava.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, attribute, "AttributeDesc"))
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ava.AppendChild(ber.Encode(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, value, "AssertionValue"))
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request.AppendChild(ava)
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packet.AppendChild(request)
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l.Debug.PrintPacket(packet)
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msgCtx, err := l.sendMessage(packet)
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if err != nil {
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return false, err
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}
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defer l.finishMessage(msgCtx)
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l.Debug.Printf("%d: waiting for response", msgCtx.id)
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packetResponse, ok := <-msgCtx.responses
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if !ok {
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return false, NewError(ErrorNetwork, errors.New("ldap: response channel closed"))
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}
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packet, err = packetResponse.ReadPacket()
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l.Debug.Printf("%d: got response %p", msgCtx.id, packet)
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if err != nil {
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return false, err
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}
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if l.Debug {
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if err := addLDAPDescriptions(packet); err != nil {
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return false, err
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}
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ber.PrintPacket(packet)
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}
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if packet.Children[1].Tag == ApplicationCompareResponse {
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err := GetLDAPError(packet)
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switch {
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case IsErrorWithCode(err, LDAPResultCompareTrue):
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return true, nil
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case IsErrorWithCode(err, LDAPResultCompareFalse):
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return false, nil
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default:
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return false, err
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}
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}
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return false, fmt.Errorf("unexpected Response: %d", packet.Children[1].Tag)
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}
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