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Add utls imitate setting to snowflake client

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This commit is contained in:
Shelikhoo 2022-02-10 17:04:42 +00:00
parent c1c3596cf8
commit 9af0ad119b
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GPG key ID: C4D5E79D22B25316
3 changed files with 28 additions and 4 deletions
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27
client/lib/rendezvous.go
View file

@ -5,6 +5,8 @@ package snowflake_client
import (
"errors"
"fmt"
"log"
"net/http"
"sync"
@ -14,7 +16,9 @@ import (
"git.torproject.org/pluggable-transports/snowflake.git/v2/common/messages"
"git.torproject.org/pluggable-transports/snowflake.git/v2/common/nat"
"git.torproject.org/pluggable-transports/snowflake.git/v2/common/util"
utlsutil "git.torproject.org/pluggable-transports/snowflake.git/v2/common/utls"
"github.com/pion/webrtc/v3"
utls "github.com/refraction-networking/utls"
)
const (
@ -51,10 +55,14 @@ func createBrokerTransport() http.RoundTripper {
return transport
}
// NewBrokerChannel construct a new BrokerChannel, where:
func NewBrokerChannel(broker, ampCache, front string, keepLocalAddresses bool) (*BrokerChannel, error) {
return NewBrokerChannelWithUTlsClientID(broker, ampCache, front, keepLocalAddresses, "")
}
// NewBrokerChannelWithUTlsClientID construct a new BrokerChannel, where:
// |broker| is the full URL of the facilitating program which assigns proxies
// to clients, and |front| is the option fronting domain.
func NewBrokerChannel(broker, ampCache, front string, keepLocalAddresses bool) (*BrokerChannel, error) {
func NewBrokerChannelWithUTlsClientID(broker, ampCache, front string, keepLocalAddresses bool, utlsClientID string) (*BrokerChannel, error) {
log.Println("Rendezvous using Broker at:", broker)
if ampCache != "" {
log.Println("Through AMP cache at:", ampCache)
@ -63,12 +71,23 @@ func NewBrokerChannel(broker, ampCache, front string, keepLocalAddresses bool) (
log.Println("Domain fronting using:", front)
}
brokerTransport := createBrokerTransport()
if utlsClientID != "" {
utlsClientHelloID, err := utlsutil.NameToUTlsID(utlsClientID)
if err != nil {
return nil, fmt.Errorf("unable to create broker channel: %v", err)
}
config := &utls.Config{}
brokerTransport = utlsutil.NewUTLSHTTPRoundTripper(utlsClientHelloID, config, brokerTransport, false)
}
var rendezvous RendezvousMethod
var err error
if ampCache != "" {
rendezvous, err = newAMPCacheRendezvous(broker, ampCache, front, createBrokerTransport())
rendezvous, err = newAMPCacheRendezvous(broker, ampCache, front, brokerTransport)
} else {
rendezvous, err = newHTTPRendezvous(broker, front, createBrokerTransport())
rendezvous, err = newHTTPRendezvous(broker, front, brokerTransport)
}
if err != nil {
return nil, err

3
client/lib/snowflake.go
View file

@ -97,6 +97,9 @@ type ClientConfig struct {
// Max is the maximum number of snowflake proxy peers that the client should attempt to
// connect to. Defaults to 1.
Max int
// UTlsClientID is the type of user application that snowflake should imitate.
// If an empty value is provided, it will use Go's default TLS implementation
UTlsClientID string
}
// NewSnowflakeClient creates a new Snowflake transport client that can spawn multiple

2
client/snowflake.go
View file

@ -126,6 +126,7 @@ func main() {
frontDomain := flag.String("front", "", "front domain")
ampCacheURL := flag.String("ampcache", "", "URL of AMP cache to use as a proxy for signaling")
logFilename := flag.String("log", "", "name of log file")
utlsClientHelloID := flag.String("utls-imitate", "", "type of TLS client to imitate with utls")
logToStateDir := flag.Bool("log-to-state-dir", false, "resolve the log file relative to tor's pt state dir")
keepLocalAddresses := flag.Bool("keep-local-addresses", false, "keep local LAN address ICE candidates")
unsafeLogging := flag.Bool("unsafe-logging", false, "prevent logs from being scrubbed")
@ -178,6 +179,7 @@ func main() {
ICEAddresses: iceAddresses,
KeepLocalAddresses: *keepLocalAddresses || *oldKeepLocalAddresses,
Max: *max,
UTlsClientID: *utlsClientHelloID,
}
// Begin goptlib client process.