diff --git a/packet/conn.go b/packet/conn.go
index 3772e1a33..1868031d1 100644
--- a/packet/conn.go
+++ b/packet/conn.go
@@ -7,7 +7,7 @@ import (
 	"net"
 
 	"github.com/juju/errors"
-	. "github.com/siddontang/go-mysql/mysql"
+	. "github.com/space307/go-mysql/mysql"
 )
 
 /*
diff --git a/server/auth.go b/server/auth.go
index b66ea4e0c..43145dd72 100644
--- a/server/auth.go
+++ b/server/auth.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/binary"
 
-	. "github.com/siddontang/go-mysql/mysql"
+	. "github.com/space307/go-mysql/mysql"
 )
 
 func (c *Conn) writeInitialHandshake() error {
@@ -58,7 +58,7 @@ func (c *Conn) writeInitialHandshake() error {
 	return c.WritePacket(data)
 }
 
-func (c *Conn) readHandshakeResponse(password string) error {
+func (c *Conn) readHandshakeResponse(authenticator Authentificator) error {
 	data, err := c.ReadPacket()
 
 	if err != nil {
@@ -85,8 +85,9 @@ func (c *Conn) readHandshakeResponse(password string) error {
 	user := string(data[pos : pos+bytes.IndexByte(data[pos:], 0)])
 	pos += len(user) + 1
 
-	if c.user != user {
-		return NewDefaultError(ER_NO_SUCH_USER, user, c.RemoteAddr().String())
+	password, err := authenticator.UserPass(user)
+	if err != nil {
+		return err
 	}
 
 	//auth length and auth
@@ -100,6 +101,8 @@ func (c *Conn) readHandshakeResponse(password string) error {
 		return NewDefaultError(ER_ACCESS_DENIED_ERROR, c.RemoteAddr().String(), c.user, "Yes")
 	}
 
+	c.user = user
+
 	pos += authLen
 
 	if c.capability|CLIENT_CONNECT_WITH_DB > 0 {
diff --git a/server/command.go b/server/command.go
index 3bc23ac33..bc01b6a43 100644
--- a/server/command.go
+++ b/server/command.go
@@ -4,8 +4,8 @@ import (
 	"bytes"
 	"fmt"
 
-	. "github.com/siddontang/go-mysql/mysql"
 	"github.com/siddontang/go/hack"
+	. "github.com/space307/go-mysql/mysql"
 )
 
 type Handler interface {
diff --git a/server/conn.go b/server/conn.go
index d6ea846ae..cf1a210e5 100644
--- a/server/conn.go
+++ b/server/conn.go
@@ -4,11 +4,15 @@ import (
 	"net"
 	"sync/atomic"
 
-	. "github.com/siddontang/go-mysql/mysql"
-	"github.com/siddontang/go-mysql/packet"
 	"github.com/siddontang/go/sync2"
+	. "github.com/space307/go-mysql/mysql"
+	"github.com/space307/go-mysql/packet"
 )
 
+type Authentificator interface {
+	UserPass(string) (string, error)
+}
+
 /*
    Conn acts like a MySQL server connection, you can use MySQL client to communicate with it.
 */
@@ -35,12 +39,11 @@ type Conn struct {
 
 var baseConnID uint32 = 10000
 
-func NewConn(conn net.Conn, user string, password string, h Handler) (*Conn, error) {
+func NewConn(conn net.Conn, auth Authentificator, h Handler) (*Conn, error) {
 	c := new(Conn)
 
 	c.h = h
-
-	c.user = user
+	
 	c.Conn = packet.NewConn(conn)
 
 	c.connectionID = atomic.AddUint32(&baseConnID, 1)
@@ -51,7 +54,7 @@ func NewConn(conn net.Conn, user string, password string, h Handler) (*Conn, err
 
 	c.closed.Set(false)
 
-	if err := c.handshake(password); err != nil {
+	if err := c.handshake(auth); err != nil {
 		c.Close()
 		return nil, err
 	}
@@ -59,12 +62,12 @@ func NewConn(conn net.Conn, user string, password string, h Handler) (*Conn, err
 	return c, nil
 }
 
-func (c *Conn) handshake(password string) error {
+func (c *Conn) handshake(auth Authentificator) error {
 	if err := c.writeInitialHandshake(); err != nil {
 		return err
 	}
 
-	if err := c.readHandshakeResponse(password); err != nil {
+	if err := c.readHandshakeResponse(auth); err != nil {
 		c.writeError(err)
 
 		return err
diff --git a/server/resp.go b/server/resp.go
index 1123032dd..77dc18301 100644
--- a/server/resp.go
+++ b/server/resp.go
@@ -3,7 +3,7 @@ package server
 import (
 	"fmt"
 
-	. "github.com/siddontang/go-mysql/mysql"
+	. "github.com/space307/go-mysql/mysql"
 )
 
 func (c *Conn) writeOK(r *Result) error {
diff --git a/server/stmt.go b/server/stmt.go
index 7a325d71e..6b9b52be9 100644
--- a/server/stmt.go
+++ b/server/stmt.go
@@ -7,7 +7,7 @@ import (
 	"strconv"
 
 	"github.com/juju/errors"
-	. "github.com/siddontang/go-mysql/mysql"
+	. "github.com/space307/go-mysql/mysql"
 )
 
 var paramFieldData []byte