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join_request.go
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join_request.go
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package joinserver
import (
"fmt"
"github.com/brocaar/lorawan"
"github.com/pkg/errors"
"github.com/brocaar/lorawan/backend"
)
var joinTasks = []func(*context) error{
setJoinContext,
validateMIC,
setJoinNonce,
setSessionKeys,
createJoinAnsPayload,
}
func handleJoinRequestWrapper(joinReqPL backend.JoinReqPayload, dk DeviceKeys, asKEKLabel string, asKEK []byte, nsKEKLabel string, nsKEK []byte) backend.JoinAnsPayload {
basePayload := backend.BasePayload{
ProtocolVersion: backend.ProtocolVersion1_0,
SenderID: joinReqPL.ReceiverID,
ReceiverID: joinReqPL.SenderID,
TransactionID: joinReqPL.TransactionID,
MessageType: backend.JoinAns,
}
jaPL, err := handleJoinRequest(joinReqPL, dk, asKEKLabel, asKEK, nsKEKLabel, nsKEK)
if err != nil {
var resCode backend.ResultCode
switch errors.Cause(err) {
case ErrInvalidMIC:
resCode = backend.MICFailed
default:
resCode = backend.Other
}
jaPL = backend.JoinAnsPayload{
BasePayloadResult: backend.BasePayloadResult{
BasePayload: basePayload,
Result: backend.Result{
ResultCode: resCode,
Description: err.Error(),
},
},
}
}
jaPL.BasePayload = basePayload
return jaPL
}
func handleJoinRequest(joinReqPL backend.JoinReqPayload, dk DeviceKeys, asKEKLabel string, asKEK []byte, nsKEKLabel string, nsKEK []byte) (backend.JoinAnsPayload, error) {
ctx := context{
joinReqPayload: joinReqPL,
deviceKeys: dk,
asKEKLabel: asKEKLabel,
asKEK: asKEK,
nsKEKLabel: nsKEKLabel,
nsKEK: nsKEK,
}
for _, f := range joinTasks {
if err := f(&ctx); err != nil {
return ctx.joinAnsPayload, err
}
}
return ctx.joinAnsPayload, nil
}
func setJoinContext(ctx *context) error {
if err := ctx.phyPayload.UnmarshalBinary(ctx.joinReqPayload.PHYPayload[:]); err != nil {
return errors.Wrap(err, "unmarshal phypayload error")
}
if err := ctx.netID.UnmarshalText([]byte(ctx.joinReqPayload.SenderID)); err != nil {
return errors.Wrap(err, "unmarshal netid error")
}
if err := ctx.joinEUI.UnmarshalText([]byte(ctx.joinReqPayload.ReceiverID)); err != nil {
return errors.Wrap(err, "unmarshal joineui error")
}
ctx.devEUI = ctx.joinReqPayload.DevEUI
ctx.joinType = lorawan.JoinRequestType
switch v := ctx.phyPayload.MACPayload.(type) {
case *lorawan.JoinRequestPayload:
ctx.devNonce = v.DevNonce
default:
return fmt.Errorf("expected *lorawan.JoinRequestPayload, got %T", ctx.phyPayload.MACPayload)
}
return nil
}
func validateMIC(ctx *context) error {
ok, err := ctx.phyPayload.ValidateUplinkJoinMIC(ctx.deviceKeys.NwkKey)
if err != nil {
return errors.Wrap(err, "validate mic error")
}
if !ok {
return ErrInvalidMIC
}
return nil
}
func setJoinNonce(ctx *context) error {
if ctx.deviceKeys.JoinNonce > (1<<24)-1 {
return errors.New("join-nonce overflow")
}
ctx.joinNonce = lorawan.JoinNonce(ctx.deviceKeys.JoinNonce)
return nil
}
func setSessionKeys(ctx *context) error {
var err error
ctx.fNwkSIntKey, err = getFNwkSIntKey(ctx.joinReqPayload.DLSettings.OptNeg, ctx.deviceKeys.NwkKey, ctx.netID, ctx.joinEUI, ctx.joinNonce, ctx.devNonce)
if err != nil {
return errors.Wrap(err, "get FNwkSIntKey error")
}
if ctx.joinReqPayload.DLSettings.OptNeg {
ctx.appSKey, err = getAppSKey(ctx.joinReqPayload.DLSettings.OptNeg, ctx.deviceKeys.AppKey, ctx.netID, ctx.joinEUI, ctx.joinNonce, ctx.devNonce)
if err != nil {
return errors.Wrap(err, "get AppSKey error")
}
} else {
ctx.appSKey, err = getAppSKey(ctx.joinReqPayload.DLSettings.OptNeg, ctx.deviceKeys.NwkKey, ctx.netID, ctx.joinEUI, ctx.joinNonce, ctx.devNonce)
if err != nil {
return errors.Wrap(err, "get AppSKey error")
}
}
ctx.sNwkSIntKey, err = getSNwkSIntKey(ctx.joinReqPayload.DLSettings.OptNeg, ctx.deviceKeys.NwkKey, ctx.netID, ctx.joinEUI, ctx.joinNonce, ctx.devNonce)
if err != nil {
return errors.Wrap(err, "get SNwkSIntKey error")
}
ctx.nwkSEncKey, err = getNwkSEncKey(ctx.joinReqPayload.DLSettings.OptNeg, ctx.deviceKeys.NwkKey, ctx.netID, ctx.joinEUI, ctx.joinNonce, ctx.devNonce)
if err != nil {
return errors.Wrap(err, "get NwkSEncKey error")
}
return nil
}
func createJoinAnsPayload(ctx *context) error {
var cFList *lorawan.CFList
if len(ctx.joinReqPayload.CFList[:]) != 0 {
cFList = new(lorawan.CFList)
if err := cFList.UnmarshalBinary(ctx.joinReqPayload.CFList[:]); err != nil {
return errors.Wrap(err, "unmarshal cflist error")
}
}
phy := lorawan.PHYPayload{
MHDR: lorawan.MHDR{
MType: lorawan.JoinAccept,
Major: lorawan.LoRaWANR1,
},
MACPayload: &lorawan.JoinAcceptPayload{
JoinNonce: ctx.joinNonce,
HomeNetID: ctx.netID,
DevAddr: ctx.joinReqPayload.DevAddr,
DLSettings: ctx.joinReqPayload.DLSettings,
RXDelay: uint8(ctx.joinReqPayload.RxDelay),
CFList: cFList,
},
}
if ctx.joinReqPayload.DLSettings.OptNeg {
jsIntKey, err := getJSIntKey(ctx.deviceKeys.NwkKey, ctx.devEUI)
if err != nil {
return err
}
if err := phy.SetDownlinkJoinMIC(ctx.joinType, ctx.joinEUI, ctx.devNonce, jsIntKey); err != nil {
return err
}
} else {
if err := phy.SetDownlinkJoinMIC(ctx.joinType, ctx.joinEUI, ctx.devNonce, ctx.deviceKeys.NwkKey); err != nil {
return err
}
}
if err := phy.EncryptJoinAcceptPayload(ctx.deviceKeys.NwkKey); err != nil {
return err
}
b, err := phy.MarshalBinary()
if err != nil {
return err
}
ctx.joinAnsPayload = backend.JoinAnsPayload{
BasePayloadResult: backend.BasePayloadResult{
Result: backend.Result{
ResultCode: backend.Success,
},
},
PHYPayload: backend.HEXBytes(b),
// TODO add Lifetime?
}
ctx.joinAnsPayload.AppSKey, err = backend.NewKeyEnvelope(ctx.asKEKLabel, ctx.asKEK, ctx.appSKey)
if err != nil {
return err
}
if ctx.joinReqPayload.DLSettings.OptNeg {
// LoRaWAN 1.1+
ctx.joinAnsPayload.FNwkSIntKey, err = backend.NewKeyEnvelope(ctx.nsKEKLabel, ctx.nsKEK, ctx.fNwkSIntKey)
if err != nil {
return err
}
ctx.joinAnsPayload.SNwkSIntKey, err = backend.NewKeyEnvelope(ctx.nsKEKLabel, ctx.nsKEK, ctx.sNwkSIntKey)
if err != nil {
return err
}
ctx.joinAnsPayload.NwkSEncKey, err = backend.NewKeyEnvelope(ctx.nsKEKLabel, ctx.nsKEK, ctx.nwkSEncKey)
if err != nil {
return err
}
} else {
// LoRaWAN 1.0.x
ctx.joinAnsPayload.NwkSKey, err = backend.NewKeyEnvelope(ctx.nsKEKLabel, ctx.nsKEK, ctx.fNwkSIntKey)
if err != nil {
return err
}
}
return nil
}