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/
getmux.go
164 lines (155 loc) · 3.95 KB
/
getmux.go
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package main
import (
"crypto/ed25519"
"encoding/hex"
"errors"
"fmt"
"math/rand"
"net"
"os"
"strings"
"sync"
"time"
log "github.com/sirupsen/logrus"
"github.com/ethereum/go-ethereum/rlp"
"github.com/geph-official/geph2/libs/bdclient"
"github.com/geph-official/geph2/libs/cshirt2"
"github.com/geph-official/geph2/libs/tinyss"
)
func negotiateTinySS(greeting *[2][]byte, rawConn net.Conn, pk []byte, nextProto byte) (cryptConn *tinyss.Socket, err error) {
rawConn.SetDeadline(time.Now().Add(time.Second * 20))
cryptConn, err = tinyss.Handshake(rawConn, nextProto)
if err != nil {
err = fmt.Errorf("tinyss handshake failed: %w", err)
rawConn.Close()
return
}
// verify the actual msg
var sssig []byte
err = rlp.Decode(cryptConn, &sssig)
if err != nil {
err = fmt.Errorf("cannot decode sssig: %w", err)
rawConn.Close()
return
}
if !ed25519.Verify(pk, cryptConn.SharedSec(), sssig) {
err = errors.New("man in the middle")
rawConn.Close()
return
}
if greeting != nil {
// send the greeting
rlp.Encode(cryptConn, greeting)
// wait for the reply
var reply string
err = rlp.Decode(cryptConn, &reply)
if err != nil {
err = fmt.Errorf("cannot decode reply: %w", err)
rawConn.Close()
return
}
if reply != "OK" {
err = errors.New("authentication failed")
rawConn.Close()
log.Println("authentication failed", reply)
os.Exit(11)
}
}
return
}
func dialBridge(host string, cookie []byte) (net.Conn, error) {
var port uint64
portrng := cshirt2.NewRNG(cookie)
for i := 0; i < rand.Int()%16+1; i++ {
port = portrng() % 65536
}
recombinedHost := fmt.Sprintf("%v:%v", strings.Split(host, ":")[0], port)
conn, err := net.DialTimeout("tcp", recombinedHost, time.Second*15)
if err != nil {
return nil, err
}
conn.(*net.TCPConn).SetKeepAlive(false)
return cshirt2.Client(cookie, conn)
}
var greetingCache struct {
ubmsg []byte
ubsig []byte
expires time.Time
lock sync.Mutex
}
func getGreeting() (ubmsg, ubsig []byte, err error) {
greetingCache.lock.Lock()
defer greetingCache.lock.Unlock()
if time.Now().Before(greetingCache.expires) {
ubmsg, ubsig = greetingCache.ubmsg, greetingCache.ubsig
return
}
// obtain a ticket
var ticket bdclient.TicketResp
err = binders.Do(func(b *bdclient.Client) error {
var err error
ubmsg, ubsig, ticket, err = b.GetTicket(username, password)
return err
})
if err != nil {
log.Errorln("error authenticating:", err)
if errors.Is(err, bdclient.ErrBadAuth) && loginCheck {
os.Exit(11)
}
return
}
if loginCheck {
os.Exit(0)
}
useStats(func(sc *stats) {
sc.Username = username
sc.Expiry = ticket.PaidExpiry
sc.Tier = ticket.Tier
sc.PayTxes = ticket.Transactions
})
greetingCache.ubmsg = ubmsg
greetingCache.ubsig = ubsig
greetingCache.expires = time.Now().Add(time.Second * 30)
return
}
var bridgesCache struct {
bridges []bdclient.BridgeInfo
expires time.Time
lock sync.Mutex
}
func getBridges(ubmsg, ubsig []byte) ([]bdclient.BridgeInfo, error) {
bridgesCache.lock.Lock()
defer bridgesCache.lock.Unlock()
if time.Now().Before(bridgesCache.expires) {
return bridgesCache.bridges, nil
}
var bridges []bdclient.BridgeInfo
e := binders.Do(func(b *bdclient.Client) error {
var err error
bridges, err = b.GetBridges(ubmsg, ubsig)
return err
})
if e != nil {
return nil, e
}
if additionalBridges != "" {
relays := strings.Split(additionalBridges, ";")
for _, str := range relays {
splitted := strings.Split(str, "@")
if len(splitted) != 2 {
panic("-additionalBridges must be cookie1@host1:port1;cookie2@host2:port2 etc")
}
cookie, err := hex.DecodeString(splitted[0])
if err != nil {
panic(err)
}
bridges = append(bridges, bdclient.BridgeInfo{Cookie: cookie, Host: splitted[1]})
}
}
log.Infoln("Obtained", len(bridges), "bridges")
for _, b := range bridges {
log.Infof(".... %v %x", b.Host, b.Cookie)
}
bridgesCache.bridges, bridgesCache.expires = bridges, time.Now().Add(time.Minute)
return bridges, nil
}