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advanced_nego.go
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advanced_nego.go
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package advanced_nego
import (
"encoding/binary"
"errors"
"fmt"
"net"
"github.com/victorien-a/go-ora/v2/network"
)
var version int = 0xB200200
type KerberosAuthInterface interface {
Authenticate(server, service string) ([]byte, error)
}
var kerberosAuth KerberosAuthInterface = nil
// Set Kerberos5 Authentication inferface used for kerberos authentication
func SetKerberosAuth(input KerberosAuthInterface) {
kerberosAuth = input
}
type AdvNego struct {
comm *AdvancedNegoComm
serviceList []AdvNegoService
}
func NewAdvNego(session *network.Session) (*AdvNego, error) {
output := &AdvNego{
comm: &AdvancedNegoComm{session: session},
serviceList: make([]AdvNegoService, 5),
}
var err error
output.serviceList[1], err = NewAuthService(output.comm)
if err != nil {
return nil, err
}
output.serviceList[2], err = NewEncryptService(output.comm)
if err != nil {
return nil, err
}
output.serviceList[3], err = NewDataIntegrityService(output.comm)
if err != nil {
return nil, err
}
output.serviceList[4], err = NewSupervisorService(output.comm)
if err != nil {
return nil, err
}
return output, nil
}
func (nego *AdvNego) readHeader() ([]int, error) {
num, err := nego.comm.session.GetInt64(4, false, true)
if err != nil {
return nil, err
}
if num != 0xDEADBEEF {
return nil, errors.New("advanced negotiation error: during receive header")
}
output := make([]int, 4)
output[0], err = nego.comm.session.GetInt(2, false, true)
if err != nil {
return nil, err
}
output[1], err = nego.comm.session.GetInt(4, false, true)
if err != nil {
return nil, err
}
output[2], err = nego.comm.session.GetInt(2, false, true)
if err != nil {
return nil, err
}
output[3], err = nego.comm.session.GetInt(1, false, true)
return output, err
}
func (nego *AdvNego) writeHeader(length, servCount int, errFlags uint8) {
nego.comm.session.PutInt(uint64(0xDEADBEEF), 4, true, false)
nego.comm.session.PutInt(length, 2, true, false)
nego.comm.session.PutInt(version, 4, true, false)
nego.comm.session.PutInt(servCount, 2, true, false)
nego.comm.session.PutBytes(errFlags)
}
func (nego *AdvNego) readServiceHeader() ([]int, error) {
output := make([]int, 3)
var err error
output[0], err = nego.comm.session.GetInt(2, false, true)
if err != nil {
return nil, err
}
output[1], err = nego.comm.session.GetInt(2, false, true)
if err != nil {
return nil, err
}
output[2], err = nego.comm.session.GetInt(4, false, true)
return output, err
}
func (nego *AdvNego) Read() error {
header, err := nego.readHeader()
if err != nil {
return err
}
for i := 0; i < header[2]; i++ {
serviceHeader, err := nego.readServiceHeader()
if err != nil {
return err
}
if serviceHeader[2] != 0 {
return fmt.Errorf("advanced negotiation error: during receive service header: network excpetion: ora-%d", serviceHeader[2])
}
err = nego.serviceList[serviceHeader[0]].readServiceData(serviceHeader[1])
if err != nil {
return err
}
err = nego.serviceList[serviceHeader[0]].validateResponse()
if err != nil {
return err
}
}
var authKerberos bool = false
var authNTS bool = false
if authServ, ok := nego.serviceList[1].(*authService); ok {
if authServ.active {
if authServ.serviceName == "KERBEROS5" {
//return errors.New("advanced negotiation: KERBEROS5 authentication still not supported")
authKerberos = true
} else if authServ.serviceName == "NTS" {
authNTS = true
}
}
}
size := 0
numService := 0
if dataServ, ok := nego.serviceList[3].(*dataIntegrityService); ok {
if len(dataServ.publicKey) > 0 {
size = size + 12 + len(dataServ.publicKey)
numService++
}
}
if authKerberos {
size += 37
numService++
}
if authNTS {
size += 130
numService++
}
if numService == 0 {
return nil
}
nego.comm.session.ResetBuffer()
nego.writeHeader(size+13, numService, 0)
if dataServ, ok := nego.serviceList[3].(*dataIntegrityService); ok {
if len(dataServ.publicKey) > 0 {
nego.comm.session.Context.ConnOption.Tracer.Print("Send Client Public Key:")
dataServ.writeHeader(1)
nego.comm.writeBytes(dataServ.publicKey)
}
}
if authKerberos {
if kerberosAuth == nil {
return errors.New("advanced negotiation error: you need to call SetKerberosAuth with valid interface before use kerberos5 authentication")
}
if authServ, ok := nego.serviceList[1].(*authService); ok {
authServ.writeHeader(4)
nego.comm.writeVersion(authServ.getVersion())
nego.comm.writeUB4(9)
nego.comm.writeUB4(2)
nego.comm.writeUB1(1)
err = nego.comm.session.Write()
if err != nil {
return err
}
return nego.kerbosHandshake(authServ)
}
}
if authNTS {
connOption := nego.comm.session.Context.ConnOption
ntsPacket, err := createNTSNegoPacket(connOption.ClientInfo.DomainName, connOption.ClientInfo.HostName)
if err != nil {
return err
}
nego.comm.session.ResetBuffer()
nego.comm.session.PutBytes(ntsPacket...)
err = nego.comm.session.Write()
if err != nil {
return err
}
ntsHeader, err := nego.comm.session.GetBytes(33)
if err != nil {
return err
}
sizeOffset := len(ntsHeader) - 8
chaSize := binary.LittleEndian.Uint32(ntsHeader[sizeOffset : sizeOffset+4])
chaData, err := nego.comm.session.GetBytes(int(chaSize))
if err != nil {
return err
}
ntsPacket, err = createNTSAuthPacket(chaData, connOption.ClientInfo.UserName,
connOption.ClientInfo.Password)
if err != nil {
return err
}
nego.comm.session.ResetBuffer()
nego.comm.session.PutBytes(ntsPacket...)
err = nego.comm.session.Write()
if err != nil {
return err
}
//fmt.Println(nego.comm.session.GetBytes(10))
//return errors.New("interrupt")
return nil
}
return nego.comm.session.Write()
}
func (nego *AdvNego) Write() error {
nego.comm.session.ResetBuffer()
size := 0
for i := 1; i < 5; i++ {
size = size + 8 + nego.serviceList[i].getServiceDataLength()
}
//size += 13
nego.writeHeader(13+size, 4, 0)
err := nego.serviceList[4].writeServiceData()
if err != nil {
return err
}
err = nego.serviceList[1].writeServiceData()
if err != nil {
return err
}
err = nego.serviceList[2].writeServiceData()
if err != nil {
return err
}
err = nego.serviceList[3].writeServiceData()
if err != nil {
return err
}
return nego.comm.session.Write()
}
func (nego *AdvNego) StartServices() error {
err := nego.serviceList[3].activateAlgorithm()
if err != nil {
return err
}
err = nego.serviceList[2].activateAlgorithm()
if err != nil {
return err
}
err = nego.serviceList[1].activateAlgorithm()
if err != nil {
return err
}
err = nego.serviceList[4].activateAlgorithm()
if err != nil {
return err
}
return nil
}
func (nego *AdvNego) kerbosHandshake(authServ *authService) error {
header, err := nego.readHeader()
if err != nil {
return err
}
for i := 0; i < header[2]; i++ {
serviceHeader, err := nego.readServiceHeader()
if err != nil {
return err
}
if serviceHeader[2] != 0 {
return fmt.Errorf("advanced negotiation error: during receive service header: network excpetion: ora-%d", serviceHeader[2])
}
}
serviceName, err := nego.comm.readString()
if err != nil {
return err
}
serverHostName, err := nego.comm.readString()
if err != nil {
return err
}
if len(serviceName) == 0 {
return errors.New("kerberos negotiation error: Service Name not received")
}
if len(serverHostName) == 0 {
return errors.New("kerberos negotiation error: Server hostname not received")
}
ticketData, err := kerberosAuth.Authenticate(serverHostName, serviceName)
if err != nil {
return err
}
// get host ip address
localAddress, err := getHostIPAddress()
if err != nil {
return err
}
// if address is ipv6 then num1 = 24 otherwise = 2
num1 := 2
localAddress = net.IP{172, 17, 0, 2}
if len(localAddress) > 4 {
num1 = 24
}
nego.comm.session.ResetBuffer()
// sendanoheader(length of ticket + 43 + length of address, 1 , 0)
nego.writeHeader(len(ticketData)+43+len(localAddress), 1, 0)
// sendheader(4)
authServ.writeHeader(4)
// send ub2 = num1
nego.comm.writeUB2(num1)
// send ub4 = length of address
nego.comm.writeUB4(len(localAddress))
// send bytes address bytes
nego.comm.writeBytes(localAddress)
// send bytes ticket
nego.comm.writeBytes(ticketData)
// write
err = nego.comm.session.Write()
if err != nil {
return err
}
// read ano header
header, err = nego.readHeader()
if err != nil {
return err
}
for index := 0; index < header[2]; index++ {
serviceHeader, err := nego.readServiceHeader()
if err != nil {
return err
}
if serviceHeader[2] != 0 {
return &network.OracleError{ErrCode: serviceHeader[2]}
//return fmt.Errorf("advanced negotiation error: during receive service header: network excpetion: ora-%d", serviceHeader[2])
}
}
// get packet header (2)
_, err = nego.comm.readPacketHeader(2)
if err != nil {
return err
}
// num2 = get ub1
_, err = nego.comm.session.GetByte()
if err != nil {
return err
}
// receive byte array
_, err = nego.comm.readBytes()
if err != nil {
return err
}
// send ano header (25,1, 0)
nego.comm.session.ResetBuffer()
nego.writeHeader(25, 1, 0)
// as.sendheader(1)
authServ.writeHeader(1)
// send packet header(0, 1)
nego.comm.writePacketHeader(0, 1)
// write
return nego.comm.session.Write()
}
func getHostIPAddress() (net.IP, error) {
addrs, err := net.InterfaceAddrs()
if err != nil {
return nil, err
}
for _, address := range addrs {
if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
return ipnet.IP.To4(), nil
}
if ipnet.IP.To16() != nil {
return ipnet.IP.To16(), nil
}
}
}
return nil, errors.New("advanced negotiation error: during get local ip address")
}