forked from keybase/client
/
bug_3964_repairman.go
232 lines (198 loc) · 6.16 KB
/
bug_3964_repairman.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 libkb
import (
"errors"
"time"
)
type bug3964Repairman struct {
Contextified
}
func newBug3964Repairman(g *GlobalContext) *bug3964Repairman {
return &bug3964Repairman{Contextified: NewContextified(g)}
}
func (b *bug3964Repairman) attemptRepair(lctx LoginContext, lksec *LKSec, dkm DeviceKeyMap) (ran bool, serverHalfSet *LKSecServerHalfSet, err error) {
defer b.G().Trace("bug3964Repairman#attemptRepair", func() error { return err })()
var oldKeyring, newKeyring *SKBKeyringFile
oldKeyring, err = lctx.Keyring()
if err != nil {
return false, nil, err
}
newKeyring, serverHalfSet, err = oldKeyring.Bug3964Repair(lctx, lksec, dkm)
if err != nil {
return false, nil, err
}
if newKeyring == nil {
return false, nil, nil
}
if err = newKeyring.Save(); err != nil {
b.G().Log.Debug("Error saving new keyring: %s", err)
return false, nil, err
}
lctx.ClearKeyring()
return true, serverHalfSet, err
}
func (b *bug3964Repairman) loadLKSecServerDetails(lctx LoginContext, lksec *LKSec) (ret DeviceKeyMap, err error) {
defer b.G().Trace("bug3964Repairman#loadLKSecServerDetails", func() error { return err })()
ret, err = lksec.LoadServerDetails(lctx)
if err != nil {
return nil, err
}
lksec.SetFullSecret()
return ret, err
}
func (b *bug3964Repairman) updateSecretStore(nun NormalizedUsername, lksec *LKSec) error {
fs := lksec.FullSecret()
ss := b.G().SecretStoreAll
if fs.IsNil() {
b.G().Log.Warning("Got unexpected nil full secret")
return ss.ClearSecret(nun)
}
return ss.StoreSecret(nun, fs)
}
func (b *bug3964Repairman) saveRepairmanVisit(nun NormalizedUsername) (err error) {
defer b.G().Trace("bug3964Repairman#saveRepairmanVisit", func() error { return err })()
cw := b.G().Env.GetConfigWriter()
cwt, err := cw.BeginTransaction()
if err != nil {
return err
}
err = cw.SetBug3964RepairTime(nun, time.Now())
if err == nil {
err = cwt.Commit()
} else {
cwt.Abort()
}
return err
}
func (b *bug3964Repairman) postToServer(lctx LoginContext, serverHalfSet *LKSecServerHalfSet, ppgen PassphraseGeneration) (err error) {
defer b.G().Trace("bug3964Repairman#postToServer", func() error { return err })()
if serverHalfSet == nil {
return errors.New("internal error --- had nil server half set")
}
_, err = b.G().API.Post(APIArg{
Endpoint: "user/bug_3964_repair",
NeedSession: true,
Args: HTTPArgs{
"device_id": S{Val: b.G().Env.GetDeviceID().String()},
"ppgen": I{Val: int(ppgen)},
"lks_server_halves": S{Val: serverHalfSet.EncodeToHexList()},
},
SessionR: lctx.LocalSession(),
})
return err
}
func (b *bug3964Repairman) computeShortCircuit(nun NormalizedUsername) (ss bool, err error) {
defer b.G().Trace("bug3964Repairman#computeShortCircuit", func() error { return err })()
repairTime, tmpErr := b.G().Env.GetConfig().GetBug3964RepairTime(nun)
// Ignore any decoding errors
if tmpErr != nil {
b.G().Log.Warning("Problem reading previous bug 3964 repair time: %s", tmpErr)
}
if repairTime.IsZero() {
b.G().Log.Debug("| repair time is zero or wasn't set")
return false, nil
}
var fileTime time.Time
fileTime, err = StatSKBKeyringMTime(nun, b.G())
if err != nil {
return false, err
}
ss = !repairTime.Before(fileTime)
b.G().Log.Debug("| Checking repair-time (%s) v file-write-time (%s): shortCircuit=%v", repairTime, fileTime, ss)
return ss, nil
}
func (b *bug3964Repairman) fixLKSClientHalf(lctx LoginContext, lksec *LKSec, ppgen PassphraseGeneration) (err error) {
defer b.G().Trace("bug3964Repairman#fixLKSClientHalf", func() error { return err })()
var me *User
var encKey GenericKey
var ctext string
me, err = LoadMe(LoadUserArg{Contextified: NewContextified(b.G()), LoginContext: lctx})
if err != nil {
return err
}
encKey, err = me.GetDeviceSubkey()
if err != nil {
return err
}
// make client half recovery
kid := encKey.GetKID()
ctext, err = lksec.EncryptClientHalfRecovery(encKey)
if err != nil {
return err
}
_, err = b.G().API.Post(APIArg{
Endpoint: "device/update_lks_client_half",
NeedSession: true,
Args: HTTPArgs{
"ppgen": I{Val: int(ppgen)},
"kid": S{Val: kid.String()},
"lks_client_half": S{Val: ctext},
},
SessionR: lctx.LocalSession(),
})
return err
}
// Run the engine
func (b *bug3964Repairman) Run(lctx LoginContext, pps *PassphraseStream) (err error) {
defer b.G().Trace("bug3964Repairman#Run", func() error { return err })()
var lksec *LKSec
var ran bool
var dkm DeviceKeyMap
var ss bool
var serverHalfSet *LKSecServerHalfSet
nun := b.G().Env.GetUsername()
if b.G().TestOptions.NoBug3964Repair {
b.G().Log.Debug("| short circuit due to test options")
return nil
}
if pps == nil {
b.G().Log.Debug("| Can't run repairman without a passphrase stream")
return nil
}
if ss, err = b.computeShortCircuit(nun); err != nil {
return err
}
if ss {
// This logline is asserted in testing in bug_3964_repairman_test
b.G().Log.Debug("| Repairman already visited after file update; bailing out")
return nil
}
// This logline is asserted in testing in bug_3964_repairman_test
b.G().Log.Debug("| Repairman wasn't short-circuited")
lksec, err = pps.ToLKSec(b.G(), lctx.GetUID())
if err != nil {
return nil
}
if dkm, err = b.loadLKSecServerDetails(lctx, lksec); err != nil {
return err
}
if ran, serverHalfSet, err = b.attemptRepair(lctx, lksec, dkm); err != nil {
return err
}
if err != nil {
return err
}
b.G().Log.Debug("| SKB keyring repair completed; edits=%v", ran)
if !ran {
b.saveRepairmanVisit(nun)
return nil
}
if err := b.fixLKSClientHalf(lctx, lksec, pps.Generation()); err != nil {
return err
}
if ussErr := b.updateSecretStore(nun, lksec); ussErr != nil {
b.G().Log.Warning("Error in secret store manipulation: %s", ussErr)
} else {
b.saveRepairmanVisit(nun)
}
err = b.postToServer(lctx, serverHalfSet, pps.Generation())
return err
}
func RunBug3964Repairman(g *GlobalContext, lctx LoginContext, pps *PassphraseStream) error {
err := newBug3964Repairman(g).Run(lctx, pps)
if err != nil {
g.Log.Warning("Error running Bug 3964 repairman: %s", err)
}
return err
}