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server_secure_channel.go
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server_secure_channel.go
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package server
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/hmac"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/sha256"
"crypto/x509"
"encoding/binary"
"encoding/json"
"hash"
"io"
"log"
"math"
"net"
"reflect"
"sync"
"sync/atomic"
"time"
"github.com/awcullen/opcua/ua"
"github.com/djherbis/buffer"
)
const (
// sequenceHeaderSize is the size of the sequence header
sequenceHeaderSize int = 8
// the minimum number of milliseconds that a Token may be used before being renewed by the client. (5 min)
minTokenLifetime uint32 = 300 * 1000
// the maximum number of milliseconds that a Token may be used before being renewed by the client. (60 min)
maxTokenLifetime uint32 = 3600 * 1000
)
// serverSecureChannel implements a secure channel for binary data over Tcp.
type serverSecureChannel struct {
sync.RWMutex
srv *Server
localCertificate []byte
remoteCertificate []byte
localPrivateKey *rsa.PrivateKey
remotePublicKey *rsa.PublicKey
remoteApplicationURI string
localNonce []byte
remoteNonce []byte
channelID uint32
lastTokenID uint32
securityPolicyURI string
securityPolicy ua.SecurityPolicy
securityMode ua.MessageSecurityMode
remoteCertificateThumbprint []byte
localEndpoint ua.EndpointDescription
discoveryOnly bool
sendingSemaphore sync.Mutex
receivingSemaphore sync.Mutex
// responseCh chan struct {
// ua.ServiceResponse
// uint32
// }
lastSequenceNumber uint32
pendingTokenID uint32
pendingTokenExpiration time.Time
tokenID uint32
tokenExpiration time.Time
localSigningKey []byte
localEncryptingKey []byte
localInitializationVector []byte
remoteSigningKey []byte
remoteEncryptingKey []byte
remoteInitializationVector []byte
encryptionBuffer []byte
sendBuffer []byte
receiveBuffer []byte
symSignHMAC hash.Hash
symVerifyHMAC hash.Hash
symEncryptingBlockCipher cipher.Block
symDecryptingBlockCipher cipher.Block
trace bool
receiveBufferSize uint32
sendBufferSize uint32
maxMessageSize uint32
maxChunkCount uint32
endpointURL string
conn net.Conn
}
// newServerSecureChannel initializes a new instance of the UaTcpSecureChannel.
func newServerSecureChannel(srv *Server, conn net.Conn, receiveBufferSize, sendBufferSize, maxMessageSize, maxChunkCount uint32, trace bool) *serverSecureChannel {
ch := &serverSecureChannel{
srv: srv,
conn: conn,
receiveBufferSize: receiveBufferSize,
sendBufferSize: sendBufferSize,
maxMessageSize: maxMessageSize,
maxChunkCount: maxChunkCount,
trace: trace,
channelID: srv.getNextChannelID(),
securityPolicyURI: ua.SecurityPolicyURINone,
securityPolicy: new(ua.SecurityPolicyNone),
localCertificate: srv.localCertificate,
localPrivateKey: srv.localPrivateKey,
tokenExpiration: time.Now().Add(20 * time.Second),
}
return ch
}
// LocalEndpoint gets the endpoint for the local application.
func (ch *serverSecureChannel) LocalEndpoint() ua.EndpointDescription {
ch.RLock()
defer ch.RUnlock()
return ch.localEndpoint
}
// RemoteCertificate gets the certificate for the remote application.
func (ch *serverSecureChannel) RemoteCertificate() []byte {
ch.RLock()
defer ch.RUnlock()
return ch.remoteCertificate
}
// RemotePublicKey gets the remote public key.
func (ch *serverSecureChannel) RemotePublicKey() *rsa.PublicKey {
ch.RLock()
defer ch.RUnlock()
return ch.remotePublicKey
}
// ChannelID gets the channel id.
func (ch *serverSecureChannel) ChannelID() uint32 {
ch.RLock()
defer ch.RUnlock()
return ch.channelID
}
// NamespaceURIs gets the namespace uris.
func (ch *serverSecureChannel) NamespaceURIs() []string {
return ch.srv.NamespaceUris()
}
// ServerURIs gets the server uris.
func (ch *serverSecureChannel) ServerURIs() []string {
return ch.srv.ServerUris()
}
// SecurityPolicyURI returns the SecurityPolicyURI.
func (ch *serverSecureChannel) SecurityPolicyURI() string {
ch.RLock()
defer ch.RUnlock()
return ch.securityPolicyURI
}
// SecurityMode returns the SecurityMode.
func (ch *serverSecureChannel) SecurityMode() ua.MessageSecurityMode {
ch.RLock()
defer ch.RUnlock()
return ch.securityMode
}
// LocalReceiveBufferSize gets the size of the local receive buffer.
func (ch *serverSecureChannel) LocalReceiveBufferSize() uint32 {
ch.RLock()
defer ch.RUnlock()
return ch.receiveBufferSize
}
// LocalSendBufferSize gets the size of the local send buffer.
func (ch *serverSecureChannel) LocalSendBufferSize() uint32 {
ch.RLock()
defer ch.RUnlock()
return ch.sendBufferSize
}
// LocalMaxMessageSize gets the maximum size of message that may be received by the local endpoint.
func (ch *serverSecureChannel) LocalMaxMessageSize() uint32 {
ch.RLock()
defer ch.RUnlock()
return ch.maxMessageSize
}
// LocalMaxChunkCount gets the maximum number of chunks that may be received by the local endpoint.
func (ch *serverSecureChannel) LocalMaxChunkCount() uint32 {
ch.RLock()
defer ch.RUnlock()
return ch.maxChunkCount
}
// IsExpired returns true if the life of the current Token is exceeded.
func (ch *serverSecureChannel) IsExpired() bool {
ch.RLock()
defer ch.RUnlock()
return time.Now().After(ch.tokenExpiration)
}
// Open the secure channel to the remote endpoint.
func (ch *serverSecureChannel) Open() error {
ch.Lock()
defer ch.Unlock()
// log.Printf("Opening secure channel.\n")
buf := *(bytesPool.Get().(*[]byte))
defer bytesPool.Put(&buf)
ch.conn.SetDeadline(ch.tokenExpiration)
_, err := ch.read(buf)
if err != nil {
return ua.BadDecodingError
}
var reader = bytes.NewReader(buf)
var ec = ua.NewEncodingContext()
var dec = ua.NewBinaryDecoder(reader, ec)
var msgType uint32
if err := dec.ReadUInt32(&msgType); err != nil {
return ua.BadDecodingError
}
var msgLen uint32
if err := dec.ReadUInt32(&msgLen); err != nil {
return ua.BadDecodingError
}
var remoteProtocolVersion, remoteReceiveBufferSize, remoteSendBufferSize, remoteMaxMessageSize, remoteMaxChunkCount uint32
switch msgType {
case ua.MessageTypeHello:
if msgLen < 28 {
return ua.BadDecodingError
}
if err != nil {
return ua.BadDecodingError
}
if err = dec.ReadUInt32(&remoteProtocolVersion); err != nil || remoteProtocolVersion < protocolVersion {
return ua.BadProtocolVersionUnsupported
}
if err = dec.ReadUInt32(&remoteReceiveBufferSize); err != nil {
return ua.BadDecodingError
}
if err = dec.ReadUInt32(&remoteSendBufferSize); err != nil {
return ua.BadDecodingError
}
if err = dec.ReadUInt32(&remoteMaxMessageSize); err != nil {
return ua.BadDecodingError
}
if err = dec.ReadUInt32(&remoteMaxChunkCount); err != nil {
return ua.BadDecodingError
}
if err := dec.ReadString(&ch.endpointURL); err != nil {
return ua.BadDecodingError
}
// log.Printf("-> Hello { ver: %d, rec: %d, snd: %d, msg: %d, chk: %d, ep: %s }\n", remoteProtocolVersion, ch.remoteReceiveBufferSize, ch.remoteSendBufferSize, ch.remoteMaxMessageSize, ch.remoteMaxChunkCount, ch.endpointUrl)
default:
return ua.BadDecodingError
}
var writer = ua.NewWriter(buf)
var enc = ua.NewBinaryEncoder(writer, ec)
// limit the receive buffer to what the sender can send
if ch.receiveBufferSize > remoteSendBufferSize {
ch.receiveBufferSize = remoteSendBufferSize
}
// limit the send buffer to what the receiver can receive
if ch.sendBufferSize > remoteReceiveBufferSize {
ch.sendBufferSize = remoteReceiveBufferSize
}
// limit the max message size to what the receiver can receive
if remoteMaxMessageSize > 0 && ch.maxMessageSize > remoteMaxMessageSize {
ch.maxMessageSize = remoteMaxMessageSize
}
// limit the max chunk count to what the receiver can receive
if remoteMaxChunkCount > 0 && ch.maxChunkCount > remoteMaxChunkCount {
ch.maxChunkCount = remoteMaxChunkCount
}
enc.WriteUInt32(ua.MessageTypeAck)
enc.WriteUInt32(uint32(28))
enc.WriteUInt32(protocolVersion)
enc.WriteUInt32(ch.receiveBufferSize)
enc.WriteUInt32(ch.sendBufferSize)
enc.WriteUInt32(ch.maxMessageSize)
enc.WriteUInt32(ch.maxChunkCount)
_, err = ch.write(writer.Bytes())
if err != nil {
return ua.BadEncodingError
}
// log.Printf("<- Ack { ver: %d, rec: %d, snd: %d, msg: %d, chk: %d, ep: %s }\n", protocolVersion, ch.receiveBufferSize, ch.sendBufferSize, ch.maxMessageSize, ch.maxChunkCount, ch.conn.RemoteAddr())
ch.sendBuffer = make([]byte, ch.sendBufferSize)
ch.receiveBuffer = make([]byte, ch.receiveBufferSize)
ch.encryptionBuffer = make([]byte, ch.sendBufferSize)
// ch.responseCh = make(chan struct {
// ua.ServiceResponse
// uint32
// }, 32)
// read first request, which must be an OpenSecureChannelRequest
req, rid, err := ch.readRequest()
if err != nil {
return err
}
oscr, ok := req.(*ua.OpenSecureChannelRequest)
if !ok {
return ua.BadDecodingError
}
ch.securityMode = oscr.SecurityMode
if ch.securityMode == ua.MessageSecurityModeSignAndEncrypt || ch.securityMode == ua.MessageSecurityModeSign {
ch.localNonce = getNextNonce(ch.securityPolicy.NonceSize())
} else {
ch.localNonce = []byte{}
}
ch.remoteNonce = []byte(oscr.ClientNonce)
for _, ep := range ch.srv.Endpoints() {
if ep.TransportProfileURI == ua.TransportProfileURIUaTcpTransport && ep.SecurityPolicyURI == ch.securityPolicyURI && ep.SecurityMode == ch.securityMode {
ch.localEndpoint = ep
break
}
}
// connecting for discovery only
if ch.localEndpoint.EndpointURL == "" && ch.securityPolicyURI == ua.SecurityPolicyURINone && ch.securityMode == ua.MessageSecurityModeNone {
ch.discoveryOnly = true
ch.localEndpoint = ua.EndpointDescription{
EndpointURL: ch.srv.localDescription.DiscoveryURLs[0],
Server: ch.srv.localDescription,
SecurityMode: ua.MessageSecurityModeNone,
SecurityPolicyURI: ua.SecurityPolicyURINone,
UserIdentityTokens: []ua.UserTokenPolicy{
{
PolicyID: "Anonymous",
TokenType: ua.UserTokenTypeAnonymous,
SecurityPolicyURI: ua.SecurityPolicyURINone,
},
},
TransportProfileURI: ua.TransportProfileURIUaTcpTransport,
SecurityLevel: 0,
}
}
if ch.securityMode == ua.MessageSecurityModeSignAndEncrypt || ch.securityMode == ua.MessageSecurityModeSign {
rc := ch.remoteCertificate
if rc == nil {
return ua.BadSecurityChecksFailed
}
cert, err := x509.ParseCertificate(ch.remoteCertificate)
if err != nil {
return ua.BadSecurityChecksFailed
}
err = ua.ValidateCertificate(
cert,
[]x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
"",
ch.srv.trustedCertsPath,
ch.srv.trustedCRLsPath,
ch.srv.issuerCertsPath,
ch.srv.issuerCRLsPath,
ch.srv.rejectedCertsPath,
false,
ch.srv.suppressCertificateExpired,
ch.srv.suppressCertificateChainIncomplete,
ch.srv.suppressCertificateRevocationUnknown,
)
if err != nil {
return err
}
ch.remotePublicKey = cert.PublicKey.(*rsa.PublicKey)
if len(cert.URIs) > 0 {
ch.remoteApplicationURI = cert.URIs[0].String()
}
}
ch.pendingTokenID = ch.getNextTokenID()
revisedLifetime := oscr.RequestedLifetime
if revisedLifetime > maxTokenLifetime {
revisedLifetime = maxTokenLifetime
}
if revisedLifetime < minTokenLifetime {
revisedLifetime = minTokenLifetime
}
ch.pendingTokenExpiration = time.Now().Add(time.Duration(revisedLifetime) * time.Millisecond)
res := &ua.OpenSecureChannelResponse{
ResponseHeader: ua.ResponseHeader{
Timestamp: time.Now(),
RequestHandle: oscr.Header().RequestHandle,
},
ServerProtocolVersion: protocolVersion,
SecurityToken: ua.ChannelSecurityToken{
ChannelID: ch.channelID,
TokenID: ch.pendingTokenID,
CreatedAt: time.Now(),
RevisedLifetime: revisedLifetime,
},
ServerNonce: ua.ByteString(ch.localNonce),
}
err = ch.Write(res, rid)
if err != nil {
return err
}
// log.Printf("Issued security token. %d , lifetime: %d\n", res.SecurityToken.TokenID, res.SecurityToken.RevisedLifetime)
return nil
}
// Close the secure channel.
func (ch *serverSecureChannel) Close() error {
ch.Lock()
defer ch.Unlock()
// log.Printf("Closing secure channel.\n")
if ch.conn != nil {
ch.conn.Close()
}
return nil
}
// Abort the secure channel.
func (ch *serverSecureChannel) Abort(reason ua.StatusCode, message string) error {
ch.Lock()
defer ch.Unlock()
// log.Printf("Aborting secure channel.\n")
if ch.conn != nil {
buf := *(bytesPool.Get().(*[]byte))
defer bytesPool.Put(&buf)
var writer = ua.NewWriter(buf)
var ec = ua.NewEncodingContext()
var enc = ua.NewBinaryEncoder(writer, ec)
enc.WriteUInt32(ua.MessageTypeError)
enc.WriteUInt32(uint32(16 + len(message)))
enc.WriteUInt32(uint32(reason))
enc.WriteString(message)
ch.conn.SetWriteDeadline(time.Now().Add(3000 * time.Millisecond))
ch.write(writer.Bytes())
// log.Printf("<- Err { reason: 0x%X, message: %s }\n", uint32(reason), message)
ch.conn.Close()
}
return nil
}
// Write the service response.
func (ch *serverSecureChannel) Write(res ua.ServiceResponse, id uint32) error {
if ch.trace {
b, _ := json.MarshalIndent(res, "", " ")
log.Printf("%s%s", reflect.TypeOf(res).Elem().Name(), b)
}
switch res1 := res.(type) {
case *ua.OpenSecureChannelResponse:
return ch.sendOpenSecureChannelResponse(res1, id)
default:
return ch.sendServiceResponse(res1, id)
}
}
// sendOpenSecureChannelResponse sends open secure channel service response on transport channel.
func (ch *serverSecureChannel) sendOpenSecureChannelResponse(res *ua.OpenSecureChannelResponse, id uint32) error {
ch.sendingSemaphore.Lock()
defer ch.sendingSemaphore.Unlock()
var bodyStream = buffer.NewPartitionAt(bufferPool)
defer bodyStream.Reset()
var bodyEncoder = ua.NewBinaryEncoder(bodyStream, ch)
if err := bodyEncoder.WriteNodeID(ua.ObjectIDOpenSecureChannelResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
if i := int64(ch.maxMessageSize); i > 0 && bodyStream.Len() > i {
return ua.BadEncodingLimitsExceeded
}
// write chunks
var chunkCount int
var bodyCount = int(bodyStream.Len())
for bodyCount > 0 {
chunkCount++
if i := int(ch.maxChunkCount); i > 0 && chunkCount > i {
return ua.BadEncodingLimitsExceeded
}
var plainHeaderSize int
var signatureSize int
var paddingHeaderSize int
var maxBodySize int
var bodySize int
var paddingSize int
var chunkSize int
var cipherTextBlockSize int
var plainTextBlockSize int
switch ch.securityMode {
case ua.MessageSecurityModeSignAndEncrypt, ua.MessageSecurityModeSign:
plainHeaderSize = 16 + len(ch.securityPolicyURI) + 28 + len(ch.localCertificate)
signatureSize = ch.localPrivateKey.Size()
cipherTextBlockSize = ch.remotePublicKey.Size()
plainTextBlockSize = cipherTextBlockSize - ch.securityPolicy.RSAPaddingSize()
if cipherTextBlockSize > 256 {
paddingHeaderSize = 2
} else {
paddingHeaderSize = 1
}
maxBodySize = (((int(ch.sendBufferSize) - plainHeaderSize) / cipherTextBlockSize) * plainTextBlockSize) - sequenceHeaderSize - paddingHeaderSize - signatureSize
if bodyCount < maxBodySize {
bodySize = bodyCount
paddingSize = (plainTextBlockSize - ((sequenceHeaderSize + bodySize + paddingHeaderSize + signatureSize) % plainTextBlockSize)) % plainTextBlockSize
} else {
bodySize = maxBodySize
paddingSize = 0
}
chunkSize = plainHeaderSize + (((sequenceHeaderSize + bodySize + paddingSize + paddingHeaderSize + signatureSize) / plainTextBlockSize) * cipherTextBlockSize)
default:
plainHeaderSize = int(16 + len(ch.securityPolicyURI) + 8)
signatureSize = 0
paddingHeaderSize = 0
paddingSize = 0
cipherTextBlockSize = 1
plainTextBlockSize = 1
maxBodySize = int(ch.sendBufferSize) - plainHeaderSize - sequenceHeaderSize - paddingHeaderSize - signatureSize
if bodyCount < maxBodySize {
bodySize = bodyCount
} else {
bodySize = maxBodySize
}
chunkSize = plainHeaderSize + sequenceHeaderSize + bodySize + paddingSize + paddingHeaderSize + signatureSize
}
var stream = ua.NewWriter(ch.sendBuffer)
var encoder = ua.NewBinaryEncoder(stream, ch)
// header
encoder.WriteUInt32(ua.MessageTypeOpenFinal)
encoder.WriteUInt32(uint32(chunkSize))
encoder.WriteUInt32(ch.channelID)
// asymmetric security header
encoder.WriteString(ch.securityPolicyURI)
if ch.securityMode == ua.MessageSecurityModeSignAndEncrypt || ch.securityMode == ua.MessageSecurityModeSign {
encoder.WriteByteArray(ch.localCertificate)
thumbprint := sha1.Sum(ch.remoteCertificate)
encoder.WriteByteArray(thumbprint[:])
} else {
encoder.WriteByteArray(nil)
encoder.WriteByteArray(nil)
}
if plainHeaderSize != stream.Len() {
return ua.BadEncodingError
}
// sequence header
encoder.WriteUInt32(ch.getNextSequenceNumber())
encoder.WriteUInt32(id)
// body
_, err := io.CopyN(stream, bodyStream, int64(bodySize))
if err != nil {
return err
}
bodyCount -= bodySize
// padding
if ch.securityMode == ua.MessageSecurityModeSignAndEncrypt || ch.securityMode == ua.MessageSecurityModeSign {
paddingByte := byte(paddingSize & 0xFF)
encoder.WriteByte(paddingByte)
for i := 0; i < paddingSize; i++ {
encoder.WriteByte(paddingByte)
}
if paddingHeaderSize == 2 {
extraPaddingByte := byte((paddingSize >> 8) & 0xFF)
encoder.WriteByte(extraPaddingByte)
}
}
if bodyCount > 0 {
return ua.BadEncodingError
}
// sign
if ch.securityMode == ua.MessageSecurityModeSignAndEncrypt || ch.securityMode == ua.MessageSecurityModeSign {
signature, err := ch.securityPolicy.RSASign(ch.localPrivateKey, stream.Bytes())
if err != nil {
return err
}
if len(signature) != signatureSize {
return ua.BadEncodingError
}
_, err = stream.Write(signature)
if err != nil {
return err
}
}
// encrypt
if ch.securityMode == ua.MessageSecurityModeSignAndEncrypt || ch.securityMode == ua.MessageSecurityModeSign {
plaintextLen := stream.Len()
copy(ch.encryptionBuffer, stream.Bytes()[:plainHeaderSize])
plainText := make([]byte, plainTextBlockSize)
jj := plainHeaderSize
for ii := plainHeaderSize; ii < plaintextLen; ii += plainTextBlockSize {
copy(plainText, stream.Bytes()[ii:])
// encrypt with remote public key.
cipherText, err := ch.securityPolicy.RSAEncrypt(ch.remotePublicKey, plainText)
if err != nil {
return err
}
if len(cipherText) != cipherTextBlockSize {
return ua.BadEncodingError
}
copy(ch.encryptionBuffer[jj:], cipherText)
jj += cipherTextBlockSize
}
if jj != chunkSize {
return ua.BadEncodingError
}
// pass buffer to transport
_, err := ch.write(ch.encryptionBuffer[:chunkSize])
if err != nil {
return err
}
} else {
if stream.Len() != chunkSize {
return ua.BadEncodingError
}
// pass buffer to transport
_, err := ch.write(stream.Bytes())
if err != nil {
return err
}
}
}
return nil
}
// sendServiceResponse sends the service response on transport channel.
func (ch *serverSecureChannel) sendServiceResponse(response ua.ServiceResponse, id uint32) error {
ch.sendingSemaphore.Lock()
defer ch.sendingSemaphore.Unlock()
var bodyStream = buffer.NewPartitionAt(bufferPool)
defer bodyStream.Reset()
var bodyEncoder = ua.NewBinaryEncoder(bodyStream, ch)
switch res := response.(type) {
// frequent
case *ua.PublishResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDPublishResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.ReadResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDReadResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.BrowseResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDBrowseResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.BrowseNextResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDBrowseNextResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.TranslateBrowsePathsToNodeIDsResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDTranslateBrowsePathsToNodeIDsResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.WriteResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDWriteResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.CallResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDCallResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.HistoryReadResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDHistoryReadResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
// moderate
case *ua.GetEndpointsResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDGetEndpointsResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.CreateSessionResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDCreateSessionResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.ActivateSessionResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDActivateSessionResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.CloseSessionResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDCloseSessionResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.CreateMonitoredItemsResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDCreateMonitoredItemsResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.DeleteMonitoredItemsResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDDeleteMonitoredItemsResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.CreateSubscriptionResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDCreateSubscriptionResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.DeleteSubscriptionsResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDDeleteSubscriptionsResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.SetPublishingModeResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDSetPublishingModeResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.ServiceFault:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDServiceFaultEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
// rare
case *ua.ModifyMonitoredItemsResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDModifyMonitoredItemsResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.SetMonitoringModeResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDSetMonitoringModeResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.SetTriggeringResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDSetTriggeringResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.ModifySubscriptionResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDModifySubscriptionResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.RepublishResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDRepublishResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.TransferSubscriptionsResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDTransferSubscriptionsResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.FindServersResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDFindServersResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.FindServersOnNetworkResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDFindServersOnNetworkResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.RegisterServerResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDRegisterServerResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.RegisterServer2Response:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDRegisterServer2ResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.CancelResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDCancelResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.AddNodesResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDAddNodesResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.AddReferencesResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDAddReferencesResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.DeleteNodesResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDDeleteNodesResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.DeleteReferencesResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDDeleteReferencesResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.RegisterNodesResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDRegisterNodesResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.UnregisterNodesResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDUnregisterNodesResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.QueryFirstResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDQueryFirstResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.QueryNextResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDQueryNextResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
case *ua.HistoryUpdateResponse:
if err := bodyEncoder.WriteNodeID(ua.ObjectIDHistoryUpdateResponseEncodingDefaultBinary); err != nil {
return ua.BadEncodingError
}
if err := bodyEncoder.Encode(res); err != nil {
return ua.BadEncodingError
}
default:
return ua.BadEncodingError
}
if i := int64(ch.maxMessageSize); i > 0 && bodyStream.Len() > i {
return ua.BadEncodingLimitsExceeded
}
var chunkCount int
var bodyCount = int(bodyStream.Len())
var signatureSize = ch.securityPolicy.SymSignatureSize()
var encryptionBlockSize = ch.securityPolicy.SymEncryptionBlockSize()
for bodyCount > 0 {
chunkCount++
if i := int(ch.maxChunkCount); i > 0 && chunkCount > i {
return ua.BadEncodingLimitsExceeded
}
var plainHeaderSize int
var paddingHeaderSize int
var maxBodySize int
var bodySize int
var paddingSize int
var chunkSize int
switch ch.securityMode {
case ua.MessageSecurityModeSignAndEncrypt:
plainHeaderSize = 16
if encryptionBlockSize > 256 {
paddingHeaderSize = 2
} else {
paddingHeaderSize = 1
}
maxBodySize = (((int(ch.sendBufferSize) - plainHeaderSize) / encryptionBlockSize) * encryptionBlockSize) - sequenceHeaderSize - paddingHeaderSize - signatureSize
if bodyCount < maxBodySize {
bodySize = bodyCount
paddingSize = (encryptionBlockSize - ((sequenceHeaderSize + bodySize + paddingHeaderSize + signatureSize) % encryptionBlockSize)) % encryptionBlockSize
} else {
bodySize = maxBodySize
paddingSize = 0
}
chunkSize = plainHeaderSize + sequenceHeaderSize + bodySize + paddingSize + paddingHeaderSize + signatureSize
default:
plainHeaderSize = 16
paddingHeaderSize = 0
paddingSize = 0
maxBodySize = int(ch.sendBufferSize) - plainHeaderSize - sequenceHeaderSize - paddingHeaderSize - signatureSize
if bodyCount < maxBodySize {
bodySize = bodyCount
} else {
bodySize = maxBodySize
}
chunkSize = plainHeaderSize + sequenceHeaderSize + bodySize + paddingSize + paddingHeaderSize + signatureSize
}
var stream = ua.NewWriter(ch.sendBuffer)
var encoder = ua.NewBinaryEncoder(stream, ch)
// header
if bodyCount > bodySize {
encoder.WriteUInt32(ua.MessageTypeChunk)
} else {
encoder.WriteUInt32(ua.MessageTypeFinal)
}
encoder.WriteUInt32(uint32(chunkSize))
encoder.WriteUInt32(ch.channelID)
// symmetric security header
encoder.WriteUInt32(ch.tokenID)
if plainHeaderSize != stream.Len() {
return ua.BadEncodingError
}