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package main
import (
"github.com/HimbeerserverDE/srp"
"github.com/dragonfireclient/hydra-dragonfire/convert"
"github.com/dragonfireclient/mt"
"github.com/yuin/gopher-lua"
"strings"
"time"
)
type authState uint8
const (
asInit authState = iota
asRequested
asVerified
asActive
asError
)
type CompAuth struct {
client *Client
username string
password string
language string
version string
state authState
err string
srpBytesA, bytesA []byte
userdata *lua.LUserData
}
var compAuthFuncs = map[string]lua.LGFunction{
"username": l_comp_auth_username,
"password": l_comp_auth_password,
"language": l_comp_auth_language,
"version": l_comp_auth_version,
"state": l_comp_auth_state,
}
func getCompAuth(l *lua.LState) *CompAuth {
return l.CheckUserData(1).Value.(*CompAuth)
}
func (comp *CompAuth) create(client *Client, l *lua.LState) {
if client.state != csNew {
panic("can't add auth component after connect")
}
comp.client = client
comp.language = "en_US"
comp.version = "hydra-dragonfire"
comp.state = asInit
comp.userdata = l.NewUserData()
comp.userdata.Value = comp
l.SetMetatable(comp.userdata, l.GetTypeMetatable("hydra.comp.auth"))
}
func (comp *CompAuth) push() lua.LValue {
return comp.userdata
}
func (comp *CompAuth) connect() {
if comp.username == "" {
panic("missing username")
}
go func() {
for comp.client.state == csConnected && comp.state == asInit {
comp.client.conn.SendCmd(&mt.ToSrvInit{
SerializeVer: serializeVer,
MinProtoVer: protoVer,
MaxProtoVer: protoVer,
PlayerName: comp.username,
})
time.Sleep(500 * time.Millisecond)
}
}()
}
func (comp *CompAuth) fail(err string) {
comp.err = err
comp.state = asError
comp.client.closeConn()
}
func (comp *CompAuth) checkState(state authState, pkt *mt.Pkt) bool {
if comp.state == state {
return true
}
comp.fail("received " + string(convert.PushPktType(pkt)) + " in invalid state")
return false
}
func (comp *CompAuth) process(pkt *mt.Pkt) {
if comp.state == asError {
return
}
switch cmd := pkt.Cmd.(type) {
case *mt.ToCltHello:
if !comp.checkState(asInit, pkt) {
return
}
if cmd.SerializeVer != 28 {
comp.fail("unsupported serialize version")
return
}
if cmd.AuthMethods == mt.FirstSRP {
salt, verifier, err := srp.NewClient([]byte(strings.ToLower(comp.username)), []byte(comp.password))
if err != nil {
comp.fail(err.Error())
return
}
comp.client.conn.SendCmd(&mt.ToSrvFirstSRP{
Salt: salt,
Verifier: verifier,
EmptyPasswd: comp.password == "",
})
comp.state = asVerified
} else if cmd.AuthMethods == mt.SRP {
var err error
comp.srpBytesA, comp.bytesA, err = srp.InitiateHandshake()
if err != nil {
comp.fail(err.Error())
return
}
comp.client.conn.SendCmd(&mt.ToSrvSRPBytesA{
A: comp.srpBytesA,
NoSHA1: true,
})
comp.state = asRequested
} else {
comp.fail("invalid auth methods")
return
}
case *mt.ToCltSRPBytesSaltB:
if !comp.checkState(asRequested, pkt) {
return
}
srpBytesK, err := srp.CompleteHandshake(comp.srpBytesA, comp.bytesA, []byte(strings.ToLower(comp.username)), []byte(comp.password), cmd.Salt, cmd.B)
if err != nil {
comp.fail(err.Error())
return
}
M := srp.ClientProof([]byte(comp.username), cmd.Salt, comp.srpBytesA, cmd.B, srpBytesK)
comp.srpBytesA = []byte{}
comp.bytesA = []byte{}
if M == nil {
comp.fail("srp safety check fail")
return
}
comp.client.conn.SendCmd(&mt.ToSrvSRPBytesM{
M: M,
})
comp.state = asVerified
case *mt.ToCltAcceptAuth:
comp.client.conn.SendCmd(&mt.ToSrvInit2{Lang: comp.language})
case *mt.ToCltTimeOfDay:
if comp.state == asActive {
return
}
if !comp.checkState(asVerified, pkt) {
return
}
comp.client.conn.SendCmd(&mt.ToSrvCltReady{
Major: 5,
Minor: 6,
Patch: 0,
Reserved: 0,
Formspec: 4,
Version: comp.version,
})
comp.state = asActive
}
}
func (comp *CompAuth) accessProperty(l *lua.LState, key string, ptr *string) int {
if str, ok := l.Get(2).(lua.LString); ok {
if comp.client.state != csNew {
panic("can't change " + key + " after connecting")
}
*ptr = string(str)
return 0
} else {
l.Push(lua.LString(*ptr))
return 1
}
}
func l_comp_auth_username(l *lua.LState) int {
comp := getCompAuth(l)
return comp.accessProperty(l, "username", &comp.username)
}
func l_comp_auth_password(l *lua.LState) int {
comp := getCompAuth(l)
return comp.accessProperty(l, "password", &comp.password)
}
func l_comp_auth_language(l *lua.LState) int {
comp := getCompAuth(l)
return comp.accessProperty(l, "language", &comp.language)
}
func l_comp_auth_version(l *lua.LState) int {
comp := getCompAuth(l)
return comp.accessProperty(l, "version", &comp.version)
}
func l_comp_auth_state(l *lua.LState) int {
comp := getCompAuth(l)
switch comp.state {
case asInit:
l.Push(lua.LString("init"))
case asRequested:
l.Push(lua.LString("requested"))
case asVerified:
l.Push(lua.LString("verified"))
case asActive:
l.Push(lua.LString("active"))
case asError:
l.Push(lua.LString("error"))
l.Push(lua.LString(comp.err))
return 2
}
return 1
}
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