forked from keybase/client
/
common.go
198 lines (171 loc) · 5.58 KB
/
common.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/keybase1"
)
func IsLoggedIn(e Engine, ctx *Context) (ret bool, uid keybase1.UID, err error) {
return libkb.IsLoggedIn(e.G(), ctx.LoginContext)
}
func IsProvisioned(e Engine, ctx *Context) (bool, error) {
if ctx.LoginContext != nil {
return ctx.LoginContext.LoggedInProvisionedCheck()
}
return e.G().LoginState().LoggedInProvisionedCheck()
}
type keypair struct {
encKey libkb.GenericKey
sigKey libkb.GenericKey
}
// findDeviceKeys looks for device keys and unlocks them.
func findDeviceKeys(ctx *Context, e Engine, me *libkb.User) (*keypair, error) {
// need to be logged in to get a device key (unlocked)
lin, _, err := IsLoggedIn(e, ctx)
if err != nil {
return nil, err
}
if !lin {
return nil, libkb.LoginRequiredError{}
}
// Get unlocked device for decryption and signing
// passing in nil SecretUI since we don't know the passphrase.
e.G().Log.Debug("findDeviceKeys: getting device encryption key")
parg := libkb.SecretKeyPromptArg{
LoginContext: ctx.LoginContext,
Ska: libkb.SecretKeyArg{
Me: me,
KeyType: libkb.DeviceEncryptionKeyType,
},
Reason: "change passphrase",
}
encKey, err := e.G().Keyrings.GetSecretKeyWithPrompt(parg)
if err != nil {
return nil, err
}
e.G().Log.Debug("findDeviceKeys: got device encryption key")
e.G().Log.Debug("findDeviceKeys: getting device signing key")
parg.Ska.KeyType = libkb.DeviceSigningKeyType
sigKey, err := e.G().Keyrings.GetSecretKeyWithPrompt(parg)
if err != nil {
return nil, err
}
e.G().Log.Debug("findDeviceKeys: got device signing key")
return &keypair{encKey: encKey, sigKey: sigKey}, nil
}
// findPaperKeys checks if the user has paper backup keys. If he/she
// does, it prompts for a paperkey phrase. This is used to
// regenerate paper keys, which are then matched against the
// paper keys found in the keyfamily.
func findPaperKeys(ctx *Context, g *libkb.GlobalContext, me *libkb.User) (*keypair, error) {
cki := me.GetComputedKeyInfos()
if cki == nil {
return nil, fmt.Errorf("no computed key infos")
}
bdevs := cki.PaperDevices()
if len(bdevs) == 0 {
return nil, libkb.NoPaperKeysError{}
}
passphrase, err := libkb.GetPaperKeyPassphrase(g, ctx.SecretUI, me.GetName(), nil)
if err != nil {
return nil, err
}
return matchPaperKey(ctx, g, me, passphrase)
}
// matchPaperKey checks to make sure paper is a valid paper phrase and that it exists
// in the user's keyfamily.
func matchPaperKey(ctx *Context, g *libkb.GlobalContext, me *libkb.User, paper string) (*keypair, error) {
cki := me.GetComputedKeyInfos()
if cki == nil {
return nil, fmt.Errorf("no computed key infos")
}
bdevs := cki.PaperDevices()
if len(bdevs) == 0 {
return nil, libkb.NoPaperKeysError{}
}
pc := new(libkb.PaperChecker)
if err := pc.Check(g, paper); err != nil {
return nil, err
}
// phrase has the correct version and contains valid words
paperPhrase := libkb.NewPaperKeyPhrase(paper)
bkarg := &PaperKeyGenArg{
Passphrase: paperPhrase,
SkipPush: true,
Me: me,
}
bkeng := NewPaperKeyGen(bkarg, g)
if err := RunEngine(bkeng, ctx); err != nil {
return nil, err
}
sigKey := bkeng.SigKey()
encKey := bkeng.EncKey()
g.Log.Debug("generated paper key signing kid: %s", sigKey.GetKID())
g.Log.Debug("generated paper key encryption kid: %s", encKey.GetKID())
var match bool
ckf := me.GetComputedKeyFamily()
for _, bdev := range bdevs {
sk, err := ckf.GetSibkeyForDevice(bdev.ID)
if err != nil {
g.Log.Debug("ckf.GetSibkeyForDevice(%s) error: %s", bdev.ID, err)
continue
}
g.Log.Debug("paper key device %s signing kid: %s", bdev.ID, sk.GetKID())
ek, err := ckf.GetEncryptionSubkeyForDevice(bdev.ID)
if err != nil {
g.Log.Debug("ckf.GetEncryptionSubkeyForDevice(%s) error: %s", bdev.ID, err)
continue
}
g.Log.Debug("paper key device %s encryption kid: %s", bdev.ID, ek.GetKID())
if sk.GetKID().Equal(sigKey.GetKID()) && ek.GetKID().Equal(encKey.GetKID()) {
g.Log.Debug("paper key device %s matches generated paper key", bdev.ID)
match = true
break
}
g.Log.Debug("paper key device %s does not match generated paper key", bdev.ID)
}
if !match {
g.Log.Debug("no matching paper keys found")
return nil, libkb.PassphraseError{Msg: "no matching paper backup keys found"}
}
return &keypair{sigKey: sigKey, encKey: encKey}, nil
}
// fetchLKS gets the encrypted LKS client half from the server.
// It uses encKey to decrypt it. It also returns the passphrase
// generation.
func fetchLKS(ctx *Context, g *libkb.GlobalContext, encKey libkb.GenericKey) (libkb.PassphraseGeneration, libkb.LKSecClientHalf, error) {
arg := libkb.APIArg{
Endpoint: "passphrase/recover",
SessionType: libkb.APISessionTypeREQUIRED,
Args: libkb.HTTPArgs{
"kid": encKey.GetKID(),
},
}
if ctx.LoginContext != nil {
arg.SessionR = ctx.LoginContext.LocalSession()
}
res, err := g.API.Get(arg)
var dummy libkb.LKSecClientHalf
if err != nil {
return 0, dummy, err
}
ctext, err := res.Body.AtKey("ctext").GetString()
if err != nil {
return 0, dummy, err
}
ppGen, err := res.Body.AtKey("passphrase_generation").GetInt()
if err != nil {
return 0, dummy, err
}
// Now try to decrypt with the unlocked device key
msg, _, err := encKey.DecryptFromString(ctext)
if err != nil {
return 0, dummy, err
}
clientHalf, err := libkb.NewLKSecClientHalfFromBytes(msg)
if err != nil {
return 0, dummy, err
}
return libkb.PassphraseGeneration(ppGen), clientHalf, nil
}