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pgpprovision.go
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pgpprovision.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 (
"github.com/keybase/client/go/libkb"
)
// PGPProvision is an engine.
type PGPProvision struct {
libkb.Contextified
username string
deviceName string
passphrase string
user *libkb.User
}
// NewPGPProvision creates a PGPProvision engine.
func NewPGPProvision(g *libkb.GlobalContext, username, deviceName, passphrase string) *PGPProvision {
return &PGPProvision{
Contextified: libkb.NewContextified(g),
username: username,
deviceName: deviceName,
passphrase: passphrase,
}
}
// Name is the unique engine name.
func (e *PGPProvision) Name() string {
return "PGPProvision"
}
// GetPrereqs returns the engine prereqs.
func (e *PGPProvision) Prereqs() Prereqs {
return Prereqs{}
}
// RequiredUIs returns the required UIs.
func (e *PGPProvision) RequiredUIs() []libkb.UIKind {
return []libkb.UIKind{}
}
// SubConsumers returns the other UI consumers for this engine.
func (e *PGPProvision) SubConsumers() []libkb.UIConsumer {
return []libkb.UIConsumer{
&loginLoadUser{},
&DeviceWrap{},
}
}
// Run starts the engine.
func (e *PGPProvision) Run(ctx *Context) error {
e.G().LocalSigchainGuard().Set(ctx.GetNetContext(), "PGPProvision")
defer e.G().LocalSigchainGuard().Clear(ctx.GetNetContext(), "PGPProvision")
// clear out any existing session:
e.G().Logout()
// transaction around config file
tx, err := e.G().Env.GetConfigWriter().BeginTransaction()
if err != nil {
return err
}
// From this point on, if there's an error, we abort the
// transaction.
defer func() {
if tx != nil {
tx.Abort()
}
}()
// run the LoginLoadUser sub-engine to load a user
ueng := newLoginLoadUser(e.G(), e.username)
if err = RunEngine(ueng, ctx); err != nil {
return err
}
// make sure the user isn't already provisioned (can
// get here if usernameOrEmail is an email address
// for an already provisioned on this device user).
if ueng.User().HasCurrentDeviceInCurrentInstall() {
return libkb.DeviceAlreadyProvisionedError{}
}
e.user = ueng.User()
return e.provision(ctx)
}
// provision attempts to provision with a synced pgp key. It
// needs to get a session first to look for a synced pgp key.
func (e *PGPProvision) provision(ctx *Context) error {
// After obtaining login session, this will be called before the login state is released.
// It tries to get the pgp key and uses it to provision new device keys for this device.
var afterLogin = func(lctx libkb.LoginContext) error {
ctx.LoginContext = lctx
signer, err := e.syncedPGPKey(ctx)
if err != nil {
return err
}
if err := e.makeDeviceKeysWithSigner(ctx, signer); err != nil {
return err
}
if err := lctx.LocalSession().SetDeviceProvisioned(e.G().Env.GetDeviceID()); err != nil {
// not a fatal error, session will stay in memory
e.G().Log.Warning("error saving session file: %s", err)
}
return nil
}
// need a session to try to get synced private key
return e.G().LoginState().LoginWithPassphrase(e.user.GetName(), e.passphrase, false, afterLogin)
}
// syncedPGPKey looks for a synced pgp key for e.user. If found,
// it unlocks it.
func (e *PGPProvision) syncedPGPKey(ctx *Context) (libkb.GenericKey, error) {
key, err := e.user.SyncedSecretKey(ctx.LoginContext)
if err != nil {
return nil, err
}
if key == nil {
return nil, libkb.NoSyncedPGPKeyError{}
}
e.G().Log.Debug("got synced secret key")
// unlock it
parg := ctx.SecretKeyPromptArg(libkb.SecretKeyArg{}, "sign new device")
unlocked, err := key.PromptAndUnlock(parg, nil, e.user)
if err != nil {
return nil, err
}
e.G().Log.Debug("unlocked secret key")
return unlocked, nil
}
// makeDeviceKeysWithSigner creates device keys given a signing
// key.
func (e *PGPProvision) makeDeviceKeysWithSigner(ctx *Context, signer libkb.GenericKey) error {
args, err := e.makeDeviceWrapArgs(ctx)
if err != nil {
return err
}
args.Signer = signer
args.IsEldest = false // just to be explicit
args.EldestKID = e.user.GetEldestKID()
return e.makeDeviceKeys(ctx, args)
}
// makeDeviceWrapArgs creates a base set of args for DeviceWrap.
func (e *PGPProvision) makeDeviceWrapArgs(ctx *Context) (*DeviceWrapArgs, error) {
// generate lks
salt, err := ctx.LoginContext.LoginSession().Salt()
if err != nil {
return nil, err
}
_, pps, err := libkb.StretchPassphrase(e.G(), e.passphrase, salt)
if err != nil {
return nil, err
}
// since this is just for testing, ok to set this explicitly
pps.SetGeneration(1)
lks := libkb.NewLKSec(pps, e.user.GetUID(), e.G())
return &DeviceWrapArgs{
Me: e.user,
DeviceName: e.deviceName,
DeviceType: libkb.DeviceTypeDesktop,
Lks: lks,
}, nil
}
// makeDeviceKeys uses DeviceWrap to generate device keys.
func (e *PGPProvision) makeDeviceKeys(ctx *Context, args *DeviceWrapArgs) error {
eng := NewDeviceWrap(args, e.G())
if err := RunEngine(eng, ctx); err != nil {
return err
}
return nil
}