forked from keybase/client
/
device_keygen.go
310 lines (256 loc) · 7.46 KB
/
device_keygen.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package engine
import (
"fmt"
"github.com/keybase/client/go/libkb"
keybase1 "github.com/keybase/client/go/protocol"
)
type DeviceKeygenArgs struct {
Me *libkb.User
DeviceID keybase1.DeviceID
DeviceName string
DeviceType string
Lks *libkb.LKSec
}
// DeviceKeygenPushArgs determines how the push will run. There are
// currently three different paths it can take:
//
// 1. this device is the eldest device: pushes eldest signing
// key, encryption subkey. (IsEldest => true)
//
// 2. this device is a sibling (but we're not in a key exchange
// scenario): pushes sibkey signing key, encryption subkey.
// (IsEldest => False, SkipSignerPush => false, Signer != nil,
// EldestKID != nil)
//
// 3. this device is a sibling, but another device pushed
// the signing key, so skip that part.
// (IsEldest => False, SkipSignerPush => true, Signer != nil,
// EldestKID != nil)
//
// The User argument is optional, but it is necessary if the
// user's sigchain changes between key generation and key push.
//
type DeviceKeygenPushArgs struct {
IsEldest bool
SkipSignerPush bool
Signer libkb.GenericKey
EldestKID keybase1.KID
User *libkb.User // optional
}
type DeviceKeygen struct {
args *DeviceKeygenArgs
runErr error
pushErr error
naclSignGen *libkb.NaclKeyGen
naclEncGen *libkb.NaclKeyGen
libkb.Contextified
}
// NewDeviceKeygen creates a DeviceKeygen engine.
func NewDeviceKeygen(args *DeviceKeygenArgs, g *libkb.GlobalContext) *DeviceKeygen {
return &DeviceKeygen{
args: args,
Contextified: libkb.NewContextified(g),
}
}
// Name is the unique engine name.
func (e *DeviceKeygen) Name() string {
return "DeviceKeygen"
}
// GetPrereqs returns the engine prereqs.
func (e *DeviceKeygen) Prereqs() Prereqs {
return Prereqs{Session: true}
}
// RequiredUIs returns the required UIs.
func (e *DeviceKeygen) RequiredUIs() []libkb.UIKind {
return []libkb.UIKind{
libkb.LogUIKind,
}
}
// SubConsumers returns the other UI consumers for this engine.
func (e *DeviceKeygen) SubConsumers() []libkb.UIConsumer {
return nil
}
// Run starts the engine.
func (e *DeviceKeygen) Run(ctx *Context) error {
e.setup(ctx)
e.generate()
e.localSave(ctx)
return e.runErr
}
func (e *DeviceKeygen) SigningKeyPublic() (libkb.NaclSigningKeyPublic, error) {
s, ok := e.naclSignGen.GetKeyPair().(libkb.NaclSigningKeyPair)
if !ok {
return libkb.NaclSigningKeyPublic{}, libkb.BadKeyError{Msg: fmt.Sprintf("invalid key type %T", e.naclSignGen.GetKeyPair())}
}
return s.Public, nil
}
func (e *DeviceKeygen) SigningKey() libkb.NaclKeyPair {
return e.naclSignGen.GetKeyPair()
}
func (e *DeviceKeygen) EncryptionKey() libkb.NaclKeyPair {
return e.naclEncGen.GetKeyPair()
}
// Push pushes the generated keys to the api server and stores the
// local key security server half on the api server as well.
func (e *DeviceKeygen) Push(ctx *Context, pargs *DeviceKeygenPushArgs) error {
var encSigner libkb.GenericKey
eldestKID := pargs.EldestKID
ds := []libkb.Delegator{}
// append the signing key
if pargs.IsEldest {
ds = e.appendEldest(ds, ctx, pargs)
encSigner = e.naclSignGen.GetKeyPair()
eldestKID = encSigner.GetKID()
} else if !pargs.SkipSignerPush {
ds = e.appendSibkey(ds, ctx, pargs)
encSigner = e.naclSignGen.GetKeyPair()
} else {
encSigner = pargs.Signer
}
ds = e.appendEncKey(ds, ctx, encSigner, eldestKID, pargs.User)
e.pushErr = libkb.DelegatorAggregator(ctx.LoginContext, ds)
// push the LKS server half
e.pushLKS(ctx)
return e.pushErr
}
func (e *DeviceKeygen) setup(ctx *Context) {
if e.runErr != nil {
return
}
signArg := e.newNaclArg(ctx, func() (libkb.NaclKeyPair, error) {
kp, err := libkb.GenerateNaclSigningKeyPair()
if err != nil {
return nil, err
}
return kp, nil
}, libkb.NaclEdDSAExpireIn)
e.naclSignGen = libkb.NewNaclKeyGen(signArg)
encArg := e.newNaclArg(ctx, func() (libkb.NaclKeyPair, error) {
kp, err := libkb.GenerateNaclDHKeyPair()
if err != nil {
return nil, err
}
return kp, nil
}, libkb.NaclDHExpireIn)
e.naclEncGen = libkb.NewNaclKeyGen(encArg)
}
func (e *DeviceKeygen) generate() {
if e.runErr != nil {
return
}
if e.runErr = e.naclSignGen.Generate(); e.runErr != nil {
return
}
if e.runErr = e.naclEncGen.Generate(); e.runErr != nil {
return
}
}
func (e *DeviceKeygen) localSave(ctx *Context) {
if e.runErr != nil {
return
}
if e.runErr = e.naclSignGen.SaveLKS(e.G(), e.args.Lks, ctx.LoginContext); e.runErr != nil {
return
}
if e.runErr = e.naclEncGen.SaveLKS(e.G(), e.args.Lks, ctx.LoginContext); e.runErr != nil {
return
}
}
func (e *DeviceKeygen) appendEldest(ds []libkb.Delegator, ctx *Context, pargs *DeviceKeygenPushArgs) []libkb.Delegator {
if e.pushErr != nil {
return ds
}
var d libkb.Delegator
d, e.pushErr = e.naclSignGen.Push(ctx.LoginContext, true)
if e.pushErr == nil {
d.SetGlobalContext(e.G())
return append(ds, d)
}
return ds
}
func (e *DeviceKeygen) appendSibkey(ds []libkb.Delegator, ctx *Context, pargs *DeviceKeygenPushArgs) []libkb.Delegator {
if e.pushErr != nil {
return ds
}
var d libkb.Delegator
e.naclSignGen.UpdateArg(pargs.Signer, pargs.EldestKID, true, pargs.User)
d, e.pushErr = e.naclSignGen.Push(ctx.LoginContext, true)
if e.pushErr == nil {
d.SetGlobalContext(e.G())
return append(ds, d)
}
return ds
}
func (e *DeviceKeygen) appendEncKey(ds []libkb.Delegator, ctx *Context, signer libkb.GenericKey, eldestKID keybase1.KID, user *libkb.User) []libkb.Delegator {
if e.pushErr != nil {
return ds
}
e.naclEncGen.UpdateArg(signer, eldestKID, false, user)
var d libkb.Delegator
d, e.pushErr = e.naclEncGen.Push(ctx.LoginContext, true)
if e.pushErr == nil {
d.SetGlobalContext(e.G())
return append(ds, d)
}
return ds
}
func (e *DeviceKeygen) generateClientHalfRecovery() (string, keybase1.KID, error) {
key := e.naclEncGen.GetKeyPair()
kid := key.GetKID()
ctext, err := e.args.Lks.EncryptClientHalfRecovery(key)
return ctext, kid, err
}
func (e *DeviceKeygen) pushLKS(ctx *Context) {
if e.pushErr != nil {
return
}
if e.args.Lks == nil {
e.pushErr = fmt.Errorf("no local key security set")
return
}
serverHalf := e.args.Lks.GetServerHalf()
if len(serverHalf) == 0 {
e.pushErr = fmt.Errorf("LKS server half is empty, and should not be")
return
}
var chr string
var chrk keybase1.KID
if chr, chrk, e.pushErr = e.generateClientHalfRecovery(); e.pushErr != nil {
return
}
// send it to api server
var sr libkb.SessionReader
if ctx.LoginContext != nil {
sr = ctx.LoginContext.LocalSession()
}
e.pushErr = libkb.PostDeviceLKS(sr, e.args.DeviceID, e.args.DeviceType, serverHalf, e.args.Lks.Generation(), chr, chrk)
if e.pushErr != nil {
return
}
// Sync the LKS stuff back from the server, so that subsequent
// attempts to use public key login will work.
if ctx.LoginContext != nil {
e.pushErr = ctx.LoginContext.RunSecretSyncer(e.args.Me.GetUID())
} else {
e.pushErr = e.G().LoginState().RunSecretSyncer(e.args.Me.GetUID())
}
}
func (e *DeviceKeygen) newNaclArg(ctx *Context, gen libkb.NaclGenerator, expire int) libkb.NaclKeyGenArg {
return libkb.NaclKeyGenArg{
Generator: gen,
Device: e.device(),
Me: e.args.Me,
ExpireIn: expire,
}
}
func (e *DeviceKeygen) device() *libkb.Device {
s := libkb.DeviceStatusActive
return &libkb.Device{
ID: e.args.DeviceID,
Description: &e.args.DeviceName,
Type: e.args.DeviceType,
Status: &s,
}
}