forked from quic-go/quic-go
/
tls_extension_handler_server.go
100 lines (85 loc) · 3.13 KB
/
tls_extension_handler_server.go
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package handshake
import (
"errors"
"fmt"
"github.com/lucas-clemente/quic-go/qerr"
"github.com/bifurcation/mint"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/utils"
)
type extensionHandlerServer struct {
ourParams *TransportParameters
paramsChan chan TransportParameters
version protocol.VersionNumber
supportedVersions []protocol.VersionNumber
logger utils.Logger
}
var _ mint.AppExtensionHandler = &extensionHandlerServer{}
var _ TLSExtensionHandler = &extensionHandlerServer{}
// NewExtensionHandlerServer creates a new extension handler for the server
func NewExtensionHandlerServer(
params *TransportParameters,
supportedVersions []protocol.VersionNumber,
version protocol.VersionNumber,
logger utils.Logger,
) TLSExtensionHandler {
// Processing the ClientHello is performed statelessly (and from a single go-routine).
// Therefore, we have to use a buffered chan to pass the transport parameters to that go routine.
paramsChan := make(chan TransportParameters, 1)
return &extensionHandlerServer{
ourParams: params,
paramsChan: paramsChan,
supportedVersions: supportedVersions,
version: version,
logger: logger,
}
}
func (h *extensionHandlerServer) Send(hType mint.HandshakeType, el *mint.ExtensionList) error {
if hType != mint.HandshakeTypeEncryptedExtensions {
return nil
}
h.logger.Debugf("Sending Transport Parameters: %s", h.ourParams)
eetp := &encryptedExtensionsTransportParameters{
NegotiatedVersion: h.version,
SupportedVersions: protocol.GetGreasedVersions(h.supportedVersions),
Parameters: *h.ourParams,
}
return el.Add(&tlsExtensionBody{data: eetp.Marshal()})
}
func (h *extensionHandlerServer) Receive(hType mint.HandshakeType, el *mint.ExtensionList) error {
ext := &tlsExtensionBody{}
found, err := el.Find(ext)
if err != nil {
return err
}
if hType != mint.HandshakeTypeClientHello {
if found {
return fmt.Errorf("Unexpected QUIC extension in handshake message %d", hType)
}
return nil
}
if !found {
return errors.New("ClientHello didn't contain a QUIC extension")
}
chtp := &clientHelloTransportParameters{}
if err := chtp.Unmarshal(ext.data); err != nil {
return err
}
// perform the stateless version negotiation validation:
// make sure that we would have sent a Version Negotiation Packet if the client offered the initial version
// this is the case if and only if the initial version is not contained in the supported versions
if chtp.InitialVersion != h.version && protocol.IsSupportedVersion(h.supportedVersions, chtp.InitialVersion) {
return qerr.Error(qerr.VersionNegotiationMismatch, "Client should have used the initial version")
}
// check that the client didn't send a stateless reset token
if len(chtp.Parameters.StatelessResetToken) != 0 {
// TODO: return the correct error type
return errors.New("client sent a stateless reset token")
}
h.logger.Debugf("Received Transport Parameters: %s", &chtp.Parameters)
h.paramsChan <- chtp.Parameters
return nil
}
func (h *extensionHandlerServer) GetPeerParams() <-chan TransportParameters {
return h.paramsChan
}