Update to go-ldap v3

backend/ldap.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 
 	ldaputil "git.autistici.org/ai3/go-common/ldap"
-	"gopkg.in/ldap.v2"
+	"gopkg.in/ldap.v3"
 )
 
 type LDAPQueryConfig struct {

vendor/git.autistici.org/ai3/go-common/ldap/parse.go

@@ -3,7 +3,7 @@ package ldaputil
 import (
 	"fmt"
 
-	"gopkg.in/ldap.v2"
+	"gopkg.in/ldap.v3"
 )
 
 // ParseScope parses a string representation of an LDAP scope into the

vendor/git.autistici.org/ai3/go-common/ldap/pool.go

@@ -9,7 +9,7 @@ import (
 
 	"github.com/cenkalti/backoff"
 	"go.opencensus.io/trace"
-	"gopkg.in/ldap.v2"
+	"gopkg.in/ldap.v3"
 )
 
 // Parameters that define the exponential backoff algorithm used.

vendor/gopkg.in/ldap.v2/atomic_value.go

-// +build go1.4
-
-package ldap
-
-import (
-	"sync/atomic"
-)
-
-// For compilers that support it, we just use the underlying sync/atomic.Value
-// type.
-type atomicValue struct {
-	atomic.Value
-}

vendor/gopkg.in/ldap.v2/atomic_value_go13.go

-// +build !go1.4
-
-package ldap
-
-import (
-	"sync"
-)
-
-// This is a helper type that emulates the use of the "sync/atomic.Value"
-// struct that's available in Go 1.4 and up.
-type atomicValue struct {
-	value interface{}
-	lock  sync.RWMutex
-}
-
-func (av *atomicValue) Store(val interface{}) {
-	av.lock.Lock()
-	av.value = val
-	av.lock.Unlock()
-}
-
-func (av *atomicValue) Load() interface{} {
-	av.lock.RLock()
-	ret := av.value
-	av.lock.RUnlock()
-
-	return ret
-}

vendor/gopkg.in/ldap.v2/error.go

-package ldap
-
-import (
-	"fmt"
-
-	"gopkg.in/asn1-ber.v1"
-)
-
-// LDAP Result Codes
-const (
-	LDAPResultSuccess                      = 0
-	LDAPResultOperationsError              = 1
-	LDAPResultProtocolError                = 2
-	LDAPResultTimeLimitExceeded            = 3
-	LDAPResultSizeLimitExceeded            = 4
-	LDAPResultCompareFalse                 = 5
-	LDAPResultCompareTrue                  = 6
-	LDAPResultAuthMethodNotSupported       = 7
-	LDAPResultStrongAuthRequired           = 8
-	LDAPResultReferral                     = 10
-	LDAPResultAdminLimitExceeded           = 11
-	LDAPResultUnavailableCriticalExtension = 12
-	LDAPResultConfidentialityRequired      = 13
-	LDAPResultSaslBindInProgress           = 14
-	LDAPResultNoSuchAttribute              = 16
-	LDAPResultUndefinedAttributeType       = 17
-	LDAPResultInappropriateMatching        = 18
-	LDAPResultConstraintViolation          = 19
-	LDAPResultAttributeOrValueExists       = 20
-	LDAPResultInvalidAttributeSyntax       = 21
-	LDAPResultNoSuchObject                 = 32
-	LDAPResultAliasProblem                 = 33
-	LDAPResultInvalidDNSyntax              = 34
-	LDAPResultAliasDereferencingProblem    = 36
-	LDAPResultInappropriateAuthentication  = 48
-	LDAPResultInvalidCredentials           = 49
-	LDAPResultInsufficientAccessRights     = 50
-	LDAPResultBusy                         = 51
-	LDAPResultUnavailable                  = 52
-	LDAPResultUnwillingToPerform           = 53
-	LDAPResultLoopDetect                   = 54
-	LDAPResultNamingViolation              = 64
-	LDAPResultObjectClassViolation         = 65
-	LDAPResultNotAllowedOnNonLeaf          = 66
-	LDAPResultNotAllowedOnRDN              = 67
-	LDAPResultEntryAlreadyExists           = 68
-	LDAPResultObjectClassModsProhibited    = 69
-	LDAPResultAffectsMultipleDSAs          = 71
-	LDAPResultOther                        = 80
-
-	ErrorNetwork            = 200
-	ErrorFilterCompile      = 201
-	ErrorFilterDecompile    = 202
-	ErrorDebugging          = 203
-	ErrorUnexpectedMessage  = 204
-	ErrorUnexpectedResponse = 205
-)
-
-// LDAPResultCodeMap contains string descriptions for LDAP error codes
-var LDAPResultCodeMap = map[uint8]string{
-	LDAPResultSuccess:                      "Success",
-	LDAPResultOperationsError:              "Operations Error",
-	LDAPResultProtocolError:                "Protocol Error",
-	LDAPResultTimeLimitExceeded:            "Time Limit Exceeded",
-	LDAPResultSizeLimitExceeded:            "Size Limit Exceeded",
-	LDAPResultCompareFalse:                 "Compare False",
-	LDAPResultCompareTrue:                  "Compare True",
-	LDAPResultAuthMethodNotSupported:       "Auth Method Not Supported",
-	LDAPResultStrongAuthRequired:           "Strong Auth Required",
-	LDAPResultReferral:                     "Referral",
-	LDAPResultAdminLimitExceeded:           "Admin Limit Exceeded",
-	LDAPResultUnavailableCriticalExtension: "Unavailable Critical Extension",
-	LDAPResultConfidentialityRequired:      "Confidentiality Required",
-	LDAPResultSaslBindInProgress:           "Sasl Bind In Progress",
-	LDAPResultNoSuchAttribute:              "No Such Attribute",
-	LDAPResultUndefinedAttributeType:       "Undefined Attribute Type",
-	LDAPResultInappropriateMatching:        "Inappropriate Matching",
-	LDAPResultConstraintViolation:          "Constraint Violation",
-	LDAPResultAttributeOrValueExists:       "Attribute Or Value Exists",
-	LDAPResultInvalidAttributeSyntax:       "Invalid Attribute Syntax",
-	LDAPResultNoSuchObject:                 "No Such Object",
-	LDAPResultAliasProblem:                 "Alias Problem",
-	LDAPResultInvalidDNSyntax:              "Invalid DN Syntax",
-	LDAPResultAliasDereferencingProblem:    "Alias Dereferencing Problem",
-	LDAPResultInappropriateAuthentication:  "Inappropriate Authentication",
-	LDAPResultInvalidCredentials:           "Invalid Credentials",
-	LDAPResultInsufficientAccessRights:     "Insufficient Access Rights",
-	LDAPResultBusy:                         "Busy",
-	LDAPResultUnavailable:                  "Unavailable",
-	LDAPResultUnwillingToPerform:           "Unwilling To Perform",
-	LDAPResultLoopDetect:                   "Loop Detect",
-	LDAPResultNamingViolation:              "Naming Violation",
-	LDAPResultObjectClassViolation:         "Object Class Violation",
-	LDAPResultNotAllowedOnNonLeaf:          "Not Allowed On Non Leaf",
-	LDAPResultNotAllowedOnRDN:              "Not Allowed On RDN",
-	LDAPResultEntryAlreadyExists:           "Entry Already Exists",
-	LDAPResultObjectClassModsProhibited:    "Object Class Mods Prohibited",
-	LDAPResultAffectsMultipleDSAs:          "Affects Multiple DSAs",
-	LDAPResultOther:                        "Other",
-
-	ErrorNetwork:            "Network Error",
-	ErrorFilterCompile:      "Filter Compile Error",
-	ErrorFilterDecompile:    "Filter Decompile Error",
-	ErrorDebugging:          "Debugging Error",
-	ErrorUnexpectedMessage:  "Unexpected Message",
-	ErrorUnexpectedResponse: "Unexpected Response",
-}
-
-func getLDAPResultCode(packet *ber.Packet) (code uint8, description string) {
-	if packet == nil {
-		return ErrorUnexpectedResponse, "Empty packet"
-	} else if len(packet.Children) >= 2 {
-		response := packet.Children[1]
-		if response == nil {
-			return ErrorUnexpectedResponse, "Empty response in packet"
-		}
-		if response.ClassType == ber.ClassApplication && response.TagType == ber.TypeConstructed && len(response.Children) >= 3 {
-			// Children[1].Children[2] is the diagnosticMessage which is guaranteed to exist as seen here: https://tools.ietf.org/html/rfc4511#section-4.1.9
-			return uint8(response.Children[0].Value.(int64)), response.Children[2].Value.(string)
-		}
-	}
-
-	return ErrorNetwork, "Invalid packet format"
-}
-
-// Error holds LDAP error information
-type Error struct {
-	// Err is the underlying error
-	Err error
-	// ResultCode is the LDAP error code
-	ResultCode uint8
-}
-
-func (e *Error) Error() string {
-	return fmt.Sprintf("LDAP Result Code %d %q: %s", e.ResultCode, LDAPResultCodeMap[e.ResultCode], e.Err.Error())
-}
-
-// NewError creates an LDAP error with the given code and underlying error
-func NewError(resultCode uint8, err error) error {
-	return &Error{ResultCode: resultCode, Err: err}
-}
-
-// IsErrorWithCode returns true if the given error is an LDAP error with the given result code
-func IsErrorWithCode(err error, desiredResultCode uint8) bool {
-	if err == nil {
-		return false
-	}
-
-	serverError, ok := err.(*Error)
-	if !ok {
-		return false
-	}
-
-	return serverError.ResultCode == desiredResultCode
-}

vendor/gopkg.in/ldap.v3/CONTRIBUTING.md

+# Contribution Guidelines
+
+We welcome contribution and improvements.
+
+## Guiding Principles
+
+To begin with here is a draft from an email exchange:
+
+ * take compatibility seriously (our semvers, compatibility with older go versions, etc)
+ * don't tag untested code for release
+ * beware of baking in implicit behavior based on other libraries/tools choices
+ * be as high-fidelity as possible in plumbing through LDAP data (don't mask errors or reduce power of someone using the library)

vendor/gopkg.in/ldap.v2/Makefile → vendor/gopkg.in/ldap.v3/Makefile

@@ -36,7 +36,23 @@ fmt:
 
 # Only run on go1.5+
 vet:
-	go tool vet -atomic -bool -copylocks -nilfunc -printf -shadow -rangeloops -unreachable -unsafeptr -unusedresult .
+	@go tool -n vet >/dev/null 2>&1; \
+		if [ $$? -eq 0 ]; then \
+			echo "go vet" ; \
+			go tool vet \
+				-atomic \
+				-bool \
+				-copylocks \
+				-nilfunc \
+				-printf \
+				-shadow \
+				-rangeloops \
+				-unreachable \
+				-unsafeptr \
+				-unusedresult \
+				. ; \
+		fi ;
+
 
 # https://github.com/golang/lint
 # go get github.com/golang/lint/golint
@@ -44,7 +60,7 @@ vet:
 # Only run on go1.5+
 lint:
 	@echo golint ./...
-	@OUTPUT=`golint ./... 2>&1`; \
+	@OUTPUT=`command -v golint >/dev/null 2>&1 && golint ./... 2>&1`; \
 	if [ "$$OUTPUT" ]; then \
 		echo "golint errors:"; \
 		echo "$$OUTPUT"; \

vendor/gopkg.in/ldap.v2/README.md → vendor/gopkg.in/ldap.v3/README.md

-[![GoDoc](https://godoc.org/gopkg.in/ldap.v2?status.svg)](https://godoc.org/gopkg.in/ldap.v2)
+[![GoDoc](https://godoc.org/gopkg.in/ldap.v3?status.svg)](https://godoc.org/gopkg.in/ldap.v3)
 [![Build Status](https://travis-ci.org/go-ldap/ldap.svg)](https://travis-ci.org/go-ldap/ldap)
 
 # Basic LDAP v3 functionality for the GO programming language.
@@ -7,11 +7,11 @@
 
 For the latest version use:
 
-    go get gopkg.in/ldap.v2
+    go get gopkg.in/ldap.v3
 
 Import the latest version with:
 
-    import "gopkg.in/ldap.v2"
+    import "gopkg.in/ldap.v3"
 
 ## Required Libraries:
 
@@ -27,6 +27,7 @@ Import the latest version with:
  - Modify Requests / Responses
  - Add Requests / Responses
  - Delete Requests / Responses
+ - Modify DN Requests / Responses
 
 ## Examples:
 

vendor/gopkg.in/ldap.v2/add.go → vendor/gopkg.in/ldap.v3/add.go

@@ -41,6 +41,8 @@ type AddRequest struct {
 	DN string
 	// Attributes list the attributes of the new entry
 	Attributes []Attribute
+	// Controls hold optional controls to send with the request
+	Controls []Control
 }
 
 func (a AddRequest) encode() *ber.Packet {
@@ -60,9 +62,10 @@ func (a *AddRequest) Attribute(attrType string, attrVals []string) {
 }
 
 // NewAddRequest returns an AddRequest for the given DN, with no attributes
-func NewAddRequest(dn string) *AddRequest {
+func NewAddRequest(dn string, controls []Control) *AddRequest {
 	return &AddRequest{
-		DN: dn,
+		DN:       dn,
+		Controls: controls,
 	}
 
 }
@@ -72,6 +75,9 @@ func (l *Conn) Add(addRequest *AddRequest) error {
 	packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
 	packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
 	packet.AppendChild(addRequest.encode())
+	if len(addRequest.Controls) > 0 {
+		packet.AppendChild(encodeControls(addRequest.Controls))
+	}
 
 	l.Debug.PrintPacket(packet)
 
@@ -100,9 +106,9 @@ func (l *Conn) Add(addRequest *AddRequest) error {
 	}
 
 	if packet.Children[1].Tag == ApplicationAddResponse {
-		resultCode, resultDescription := getLDAPResultCode(packet)
-		if resultCode != 0 {
-			return NewError(resultCode, errors.New(resultDescription))
+		err := GetLDAPError(packet)
+		if err != nil {
+			return err
 		}
 	} else {
 		log.Printf("Unexpected Response: %d", packet.Children[1].Tag)

vendor/gopkg.in/ldap.v2/bind.go → vendor/gopkg.in/ldap.v3/bind.go

-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
 package ldap
 
 import (
 	"errors"
+	"fmt"
 
 	"gopkg.in/asn1-ber.v1"
 )
@@ -18,6 +15,9 @@ type SimpleBindRequest struct {
 	Password string
 	// Controls are optional controls to send with the bind request
 	Controls []Control
+	// AllowEmptyPassword sets whether the client allows binding with an empty password
+	// (normally used for unauthenticated bind).
+	AllowEmptyPassword bool
 }
 
 // SimpleBindResult contains the response from the server
@@ -28,9 +28,10 @@ type SimpleBindResult struct {
 // NewSimpleBindRequest returns a bind request
 func NewSimpleBindRequest(username string, password string, controls []Control) *SimpleBindRequest {
 	return &SimpleBindRequest{
-		Username: username,
-		Password: password,
-		Controls: controls,
+		Username:           username,
+		Password:           password,
+		Controls:           controls,
+		AllowEmptyPassword: false,
 	}
 }
 
@@ -40,17 +41,22 @@ func (bindRequest *SimpleBindRequest) encode() *ber.Packet {
 	request.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, bindRequest.Username, "User Name"))
 	request.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, 0, bindRequest.Password, "Password"))
 
-	request.AppendChild(encodeControls(bindRequest.Controls))
-
 	return request
 }
 
 // SimpleBind performs the simple bind operation defined in the given request
 func (l *Conn) SimpleBind(simpleBindRequest *SimpleBindRequest) (*SimpleBindResult, error) {
+	if simpleBindRequest.Password == "" && !simpleBindRequest.AllowEmptyPassword {
+		return nil, NewError(ErrorEmptyPassword, errors.New("ldap: empty password not allowed by the client"))
+	}
+
 	packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
 	packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
 	encodedBindRequest := simpleBindRequest.encode()
 	packet.AppendChild(encodedBindRequest)
+	if len(simpleBindRequest.Controls) > 0 {
+		packet.AppendChild(encodeControls(simpleBindRequest.Controls))
+	}
 
 	if l.Debug {
 		ber.PrintPacket(packet)
@@ -73,7 +79,7 @@ func (l *Conn) SimpleBind(simpleBindRequest *SimpleBindRequest) (*SimpleBindResu
 	}
 
 	if l.Debug {
-		if err := addLDAPDescriptions(packet); err != nil {
+		if err = addLDAPDescriptions(packet); err != nil {
 			return nil, err
 		}
 		ber.PrintPacket(packet)
@@ -85,59 +91,45 @@ func (l *Conn) SimpleBind(simpleBindRequest *SimpleBindRequest) (*SimpleBindResu
 
 	if len(packet.Children) == 3 {
 		for _, child := range packet.Children[2].Children {
-			result.Controls = append(result.Controls, DecodeControl(child))
+			decodedChild, decodeErr := DecodeControl(child)
+			if decodeErr != nil {
+				return nil, fmt.Errorf("failed to decode child control: %s", decodeErr)
+			}
+			result.Controls = append(result.Controls, decodedChild)
 		}
 	}
 
-	resultCode, resultDescription := getLDAPResultCode(packet)
-	if resultCode != 0 {
-		return result, NewError(resultCode, errors.New(resultDescription))
-	}
-
-	return result, nil
+	err = GetLDAPError(packet)
+	return result, err
 }
 
-// Bind performs a bind with the given username and password
+// Bind performs a bind with the given username and password.
+//
+// It does not allow unauthenticated bind (i.e. empty password). Use the UnauthenticatedBind method
+// for that.
 func (l *Conn) Bind(username, password string) error {
-	packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
-	packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, l.nextMessageID(), "MessageID"))
-	bindRequest := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationBindRequest, nil, "Bind Request")
-	bindRequest.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, 3, "Version"))
-	bindRequest.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, username, "User Name"))
-	bindRequest.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, 0, password, "Password"))
-	packet.AppendChild(bindRequest)
-
-	if l.Debug {
-		ber.PrintPacket(packet)
-	}
-
-	msgCtx, err := l.sendMessage(packet)
-	if err != nil {
-		return err
-	}
-	defer l.finishMessage(msgCtx)
-
-	packetResponse, ok := <-msgCtx.responses
-	if !ok {
-		return NewError(ErrorNetwork, errors.New("ldap: response channel closed"))
-	}
-	packet, err = packetResponse.ReadPacket()
-	l.Debug.Printf("%d: got response %p", msgCtx.id, packet)
-	if err != nil {
-		return err
-	}
-
-	if l.Debug {
-		if err := addLDAPDescriptions(packet); err != nil {
-			return err
-		}
-		ber.PrintPacket(packet)
+	req := &SimpleBindRequest{
+		Username:           username,
+		Password:           password,
+		AllowEmptyPassword: false,
 	}
+	_, err := l.SimpleBind(req)
+	return err
+}
 
-	resultCode, resultDescription := getLDAPResultCode(packet)
-	if resultCode != 0 {
-		return NewError(resultCode, errors.New(resultDescription))
+// UnauthenticatedBind performs an unauthenticated bind.
+//
+// A username may be provided for trace (e.g. logging) purpose only, but it is normally not
+// authenticated or otherwise validated by the LDAP server.
+//
+// See https://tools.ietf.org/html/rfc4513#section-5.1.2 .
+// See https://tools.ietf.org/html/rfc4513#section-6.3.1 .
+func (l *Conn) UnauthenticatedBind(username string) error {
+	req := &SimpleBindRequest{
+		Username:           username,
+		Password:           "",
+		AllowEmptyPassword: true,
 	}
-
-	return nil
+	_, err := l.SimpleBind(req)
+	return err
 }

vendor/gopkg.in/ldap.v2/client.go → vendor/gopkg.in/ldap.v3/client.go

@@ -18,6 +18,7 @@ type Client interface {
 	Add(addRequest *AddRequest) error
 	Del(delRequest *DelRequest) error
 	Modify(modifyRequest *ModifyRequest) error
+	ModifyDN(modifyDNRequest *ModifyDNRequest) error
 
 	Compare(dn, attribute, value string) (bool, error)
 	PasswordModify(passwordModifyRequest *PasswordModifyRequest) (*PasswordModifyResult, error)

vendor/gopkg.in/ldap.v2/compare.go → vendor/gopkg.in/ldap.v3/compare.go

-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-//
 // File contains Compare functionality
 //
 // https://tools.ietf.org/html/rfc4511
@@ -41,7 +37,7 @@ func (l *Conn) Compare(dn, attribute, value string) (bool, error) {
 
 	ava := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "AttributeValueAssertion")
 	ava.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, attribute, "AttributeDesc"))
-	ava.AppendChild(ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagOctetString, value, "AssertionValue"))
+	ava.AppendChild(ber.Encode(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, value, "AssertionValue"))
 	request.AppendChild(ava)
 	packet.AppendChild(request)
 
@@ -72,14 +68,16 @@ func (l *Conn) Compare(dn, attribute, value string) (bool, error) {
 	}
 
 	if packet.Children[1].Tag == ApplicationCompareResponse {
-		resultCode, resultDescription := getLDAPResultCode(packet)
-		if resultCode == LDAPResultCompareTrue {
+		err := GetLDAPError(packet)
+
+		switch {
+		case IsErrorWithCode(err, LDAPResultCompareTrue):
 			return true, nil
-		} else if resultCode == LDAPResultCompareFalse {
+		case IsErrorWithCode(err, LDAPResultCompareFalse):
 			return false, nil
-		} else {
-			return false, NewError(resultCode, errors.New(resultDescription))
+		default:
+			return false, err
 		}
 	}
-	return false, fmt.Errorf("Unexpected Response: %d", packet.Children[1].Tag)
+	return false, fmt.Errorf("unexpected Response: %d", packet.Children[1].Tag)
 }

vendor/gopkg.in/ldap.v2/conn.go → vendor/gopkg.in/ldap.v3/conn.go

-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
 package ldap
 
 import (
@@ -10,6 +6,7 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"net/url"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -30,6 +27,13 @@ const (
 	MessageTimeout = 4
 )
 
+const (
+	// DefaultLdapPort default ldap port for pure TCP connection
+	DefaultLdapPort = "389"
+	// DefaultLdapsPort default ldap port for SSL connection
+	DefaultLdapsPort = "636"
+)
+
 // PacketResponse contains the packet or error encountered reading a response
 type PacketResponse struct {
 	// Packet is the packet read from the server
@@ -81,10 +85,13 @@ const (
 
 // Conn represents an LDAP Connection
 type Conn struct {
+	// requestTimeout is loaded atomically
+	// so we need to ensure 64-bit alignment on 32-bit platforms.
+	requestTimeout      int64
 	conn                net.Conn
 	isTLS               bool
 	closing             uint32
-	closeErr            atomicValue
+	closeErr            atomic.Value
 	isStartingTLS       bool
 	Debug               debugging
 	chanConfirm         chan struct{}
@@ -94,7 +101,6 @@ type Conn struct {
 	wgClose             sync.WaitGroup
 	outstandingRequests uint
 	messageMutex        sync.Mutex
-	requestTimeout      int64
 }
 
 var _ Client = &Conn{}
@@ -121,22 +127,51 @@ func Dial(network, addr string) (*Conn, error) {
 // DialTLS connects to the given address on the given network using tls.Dial
 // and then returns a new Conn for the connection.
 func DialTLS(network, addr string, config *tls.Config) (*Conn, error) {
-	dc, err := net.DialTimeout(network, addr, DefaultTimeout)
+	c, err := tls.DialWithDialer(&net.Dialer{Timeout: DefaultTimeout}, network, addr, config)
 	if err != nil {
 		return nil, NewError(ErrorNetwork, err)
 	}
-	c := tls.Client(dc, config)
-	err = c.Handshake()
-	if err != nil {
-		// Handshake error, close the established connection before we return an error
-		dc.Close()
-		return nil, NewError(ErrorNetwork, err)
-	}
 	conn := NewConn(c, true)
 	conn.Start()
 	return conn, nil
 }
 
+// DialURL connects to the given ldap URL vie TCP using tls.Dial or net.Dial if ldaps://
+// or ldap:// specified as protocol. On success a new Conn for the connection
+// is returned.
+func DialURL(addr string) (*Conn, error) {
+