forked from keybase/client
/
revoke.go
332 lines (279 loc) · 8.26 KB
/
revoke.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 (
"errors"
"fmt"
"github.com/keybase/client/go/libkb"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
)
type RevokeMode int
const (
RevokeKey RevokeMode = iota
RevokeDevice
)
type RevokeEngine struct {
libkb.Contextified
deviceID keybase1.DeviceID
kid keybase1.KID
mode RevokeMode
forceSelf bool
forceLast bool
}
type RevokeDeviceEngineArgs struct {
ID keybase1.DeviceID
ForceSelf bool
ForceLast bool
}
func NewRevokeDeviceEngine(args RevokeDeviceEngineArgs, g *libkb.GlobalContext) *RevokeEngine {
return &RevokeEngine{
deviceID: args.ID,
mode: RevokeDevice,
forceSelf: args.ForceSelf,
forceLast: args.ForceLast,
Contextified: libkb.NewContextified(g),
}
}
func NewRevokeKeyEngine(kid keybase1.KID, g *libkb.GlobalContext) *RevokeEngine {
return &RevokeEngine{
kid: kid,
mode: RevokeKey,
Contextified: libkb.NewContextified(g),
}
}
func (e *RevokeEngine) Name() string {
return "Revoke"
}
func (e *RevokeEngine) Prereqs() Prereqs {
return Prereqs{
Device: true,
}
}
func (e *RevokeEngine) RequiredUIs() []libkb.UIKind {
return []libkb.UIKind{
libkb.LogUIKind,
libkb.SecretUIKind,
}
}
func (e *RevokeEngine) SubConsumers() []libkb.UIConsumer {
return []libkb.UIConsumer{}
}
func (e *RevokeEngine) getKIDsToRevoke(me *libkb.User) ([]keybase1.KID, error) {
if e.mode == RevokeDevice {
deviceKeys, err := me.GetComputedKeyFamily().GetAllActiveKeysForDevice(e.deviceID)
if err != nil {
return nil, err
}
if len(deviceKeys) == 0 {
return nil, fmt.Errorf("No active keys to revoke for device %s.", e.deviceID)
}
return deviceKeys, nil
} else if e.mode == RevokeKey {
kid := e.kid
key, err := me.GetComputedKeyFamily().FindKeyWithKIDUnsafe(kid)
if err != nil {
return nil, err
}
if !libkb.IsPGP(key) {
return nil, fmt.Errorf("Key %s is not a PGP key. To revoke device keys, use the `device remove` command.", e.kid)
}
for _, activePGPKey := range me.GetComputedKeyFamily().GetActivePGPKeys(false /* sibkeys only */) {
if activePGPKey.GetKID().Equal(kid) {
return []keybase1.KID{kid}, nil
}
}
return nil, fmt.Errorf("PGP key %s is not active", e.kid)
} else {
return nil, fmt.Errorf("Unknown revoke mode: %d", e.mode)
}
}
func (e *RevokeEngine) Run(ctx *Context) error {
e.G().Log.CDebugf(ctx.NetContext, "RevokeEngine#Run (mode:%v)", e.mode)
e.G().LocalSigchainGuard().Set(ctx.GetNetContext(), "RevokeEngine")
defer e.G().LocalSigchainGuard().Clear(ctx.GetNetContext(), "RevokeEngine")
me, err := libkb.LoadMe(libkb.NewLoadUserArg(e.G()))
if err != nil {
return err
}
currentDevice := e.G().Env.GetDeviceID()
var deviceID keybase1.DeviceID
if e.mode == RevokeDevice {
deviceID = e.deviceID
if len(me.GetComputedKeyFamily().GetAllActiveDevices()) == 1 && !e.forceLast {
return libkb.RevokeLastDeviceError{}
}
if e.deviceID == currentDevice && !(e.forceSelf || e.forceLast) {
return libkb.RevokeCurrentDeviceError{}
}
}
kidsToRevoke, err := e.getKIDsToRevoke(me)
if err != nil {
return err
}
lease, merkleRoot, err := libkb.RequestDowngradeLeaseByKID(ctx.NetContext, e.G(), kidsToRevoke)
if err != nil {
return err
}
ctx.LogUI.Info("Revoking KIDs:")
for _, kid := range kidsToRevoke {
ctx.LogUI.Info(" %s", kid)
}
sigKey, encKey, err := e.getDeviceSecretKeys(ctx, me)
if err != nil {
return err
}
if encKey == nil {
return errors.New("Missing encryption key")
}
var pukBoxes []keybase1.PerUserKeyBox
var pukPrev *libkb.PerUserKeyPrev
// Whether this run is creating a new per-user-key. Set later.
addingNewPUK := false
// Only used if addingNewPUK
var newPukGeneration keybase1.PerUserKeyGeneration
var newPukSeed *libkb.PerUserKeySeed
pukring, err := e.G().GetPerUserKeyring()
if err != nil {
return err
}
err = pukring.Sync(ctx.NetContext)
if err != nil {
return err
}
if pukring.HasAnyKeys() {
addingNewPUK = true
newPukGeneration = pukring.CurrentGeneration() + 1
// Make a new per-user-key
newPukSeedInner, err := libkb.GeneratePerUserKeySeed()
if err != nil {
return err
}
newPukSeed = &newPukSeedInner
// Create a prev secretbox containing the previous generation seed
pukPrevInner, err := pukring.PreparePrev(ctx.NetContext, *newPukSeed, newPukGeneration)
if err != nil {
return err
}
pukPrev = &pukPrevInner
// Get the receivers who will be able to decrypt the new per-user-key
pukReceivers, err := e.getPukReceivers(ctx, me, kidsToRevoke)
if err != nil {
return err
}
// Create boxes of the new per-user-key
pukBoxesInner, err := pukring.PrepareBoxesForDevices(ctx.NetContext,
*newPukSeed, newPukGeneration, pukReceivers, encKey)
if err != nil {
return err
}
pukBoxes = pukBoxesInner
}
var sigsList []libkb.JSONPayload
// Push the per-user-key sig
// Seqno when the per-user-key will be signed in.
var newPukSeqno keybase1.Seqno
if addingNewPUK {
sig1, err := libkb.PerUserKeyProofReverseSigned(me, *newPukSeed, newPukGeneration, sigKey)
if err != nil {
return err
}
newPukSeqno = me.GetSigChainLastKnownSeqno()
sigsList = append(sigsList, sig1)
}
// Push the revoke sig
sig2, err := e.makeRevokeSig(ctx, me, sigKey, kidsToRevoke, deviceID, merkleRoot)
if err != nil {
return err
}
sigsList = append(sigsList, sig2)
payload := make(libkb.JSONPayload)
payload["sigs"] = sigsList
payload["downgrade_lease_id"] = lease.LeaseID
e.G().Log.CDebugf(ctx.NetContext, "RevokeEngine#Run pukBoxes:%v pukPrev:%v for generation %v",
len(pukBoxes), pukPrev != nil, newPukGeneration)
if addingNewPUK {
libkb.AddPerUserKeyServerArg(payload, newPukGeneration, pukBoxes, pukPrev)
}
_, err = e.G().API.PostJSON(libkb.APIArg{
Endpoint: "key/multi",
SessionType: libkb.APISessionTypeREQUIRED,
JSONPayload: payload,
})
if err != nil {
return err
}
if addingNewPUK {
err = pukring.AddKey(ctx.NetContext, newPukGeneration, newPukSeqno, *newPukSeed)
if err != nil {
return err
}
}
e.G().UserChanged(me.GetUID())
return nil
}
// Get the full keys for this device.
// Returns (sigKey, encKey, err)
func (e *RevokeEngine) getDeviceSecretKeys(ctx *Context, me *libkb.User) (libkb.GenericKey, libkb.GenericKey, error) {
skaSig := libkb.SecretKeyArg{
Me: me,
KeyType: libkb.DeviceSigningKeyType,
}
sigKey, err := e.G().Keyrings.GetSecretKeyWithPrompt(ctx.SecretKeyPromptArg(skaSig, "to revoke another key"))
if err != nil {
return nil, nil, err
}
if err = sigKey.CheckSecretKey(); err != nil {
return nil, nil, err
}
skaEnc := libkb.SecretKeyArg{
Me: me,
KeyType: libkb.DeviceEncryptionKeyType,
}
encKey, err := e.G().Keyrings.GetSecretKeyWithPrompt(ctx.SecretKeyPromptArg(skaEnc, "to revoke another key"))
if err != nil {
return nil, nil, err
}
if err = encKey.CheckSecretKey(); err != nil {
return nil, nil, err
}
return sigKey, encKey, err
}
func (e *RevokeEngine) makeRevokeSig(ctx *Context, me *libkb.User, sigKey libkb.GenericKey,
kidsToRevoke []keybase1.KID, deviceID keybase1.DeviceID, merkleRoot *libkb.MerkleRoot) (libkb.JSONPayload, error) {
proof, err := me.RevokeKeysProof(sigKey, kidsToRevoke, deviceID, merkleRoot)
if err != nil {
return nil, err
}
sig, _, _, err := libkb.SignJSON(proof, sigKey)
if err != nil {
return nil, err
}
sig1 := make(libkb.JSONPayload)
sig1["sig"] = sig
sig1["signing_kid"] = sigKey.GetKID().String()
sig1["type"] = libkb.LinkTypeRevoke
return sig1, nil
}
// Get the receivers of the new per-user-key boxes.
// Includes all device subkeys except any being revoked by this engine.
func (e *RevokeEngine) getPukReceivers(ctx *Context, me *libkb.User, exclude []keybase1.KID) (res []libkb.NaclDHKeyPair, err error) {
excludeMap := make(map[keybase1.KID]bool)
for _, kid := range exclude {
excludeMap[kid] = true
}
ckf := me.GetComputedKeyFamily()
for _, dev := range ckf.GetAllActiveDevices() {
keyGeneric, err := ckf.GetEncryptionSubkeyForDevice(dev.ID)
if err != nil {
return nil, err
}
if !excludeMap[keyGeneric.GetKID()] {
key, ok := keyGeneric.(libkb.NaclDHKeyPair)
if !ok {
return nil, fmt.Errorf("Unexpected encryption key type: %T", keyGeneric)
}
res = append(res, key)
}
}
return res, nil
}