forked from keybase/client
/
track_token.go
250 lines (213 loc) · 6.71 KB
/
track_token.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"
jsonw "github.com/keybase/go-jsonw"
)
// TrackToken is an engine.
type TrackToken struct {
libkb.Contextified
arg *TrackTokenArg
them *libkb.User
trackStatementBytes []byte
trackStatement *jsonw.Wrapper
}
type TrackTokenArg struct {
Token keybase1.TrackToken
Me *libkb.User
Options keybase1.TrackOptions
}
// NewTrackToken creates a TrackToken engine.
func NewTrackToken(arg *TrackTokenArg, g *libkb.GlobalContext) *TrackToken {
return &TrackToken{
arg: arg,
Contextified: libkb.NewContextified(g),
}
}
// Name is the unique engine name.
func (e *TrackToken) Name() string {
return "TrackToken"
}
// GetPrereqs returns the engine prereqs.
func (e *TrackToken) Prereqs() Prereqs {
return Prereqs{
Session: true,
}
}
// RequiredUIs returns the required UIs.
func (e *TrackToken) RequiredUIs() []libkb.UIKind {
return []libkb.UIKind{}
}
// SubConsumers returns the other UI consumers for this engine.
func (e *TrackToken) SubConsumers() []libkb.UIConsumer {
return nil
}
// Run starts the engine.
func (e *TrackToken) Run(ctx *Context) (err error) {
e.G().Trace("TrackToken", func() error { return err })()
if len(e.arg.Token) == 0 {
err = fmt.Errorf("missing TrackToken argument")
return err
}
if err = e.loadMe(); err != nil {
e.G().Log.Info("loadme err: %s", err)
return err
}
var outcome *libkb.IdentifyOutcome
outcome, err = e.G().TrackCache.Get(e.arg.Token)
if err != nil {
return err
}
if outcome.TrackStatus() == keybase1.TrackStatus_UPDATE_OK && !e.arg.Options.ForceRetrack {
e.G().Log.Debug("tracking statement up-to-date.")
return nil
}
if err = e.loadThem(outcome.Username); err != nil {
return err
}
if e.arg.Me.Equal(e.them) {
err = libkb.SelfTrackError{}
return err
}
if err = e.isTrackTokenStale(outcome); err != nil {
e.G().Log.Debug("Track statement is stale")
return err
}
// need public signing key for track statement
signingKeyPub, err := e.arg.Me.SigningKeyPub()
if err != nil {
return err
}
if e.trackStatement, err = e.arg.Me.TrackingProofFor(signingKeyPub, e.them, outcome); err != nil {
e.G().Log.Debug("tracking proof err: %s", err)
return err
}
if e.trackStatementBytes, err = e.trackStatement.Marshal(); err != nil {
return err
}
e.G().Log.Debug("| Tracking statement: %s", string(e.trackStatementBytes))
if e.arg.Options.LocalOnly || e.arg.Options.ExpiringLocal {
e.G().Log.Debug("| Local")
err = e.storeLocalTrack()
} else {
err = e.storeRemoteTrack(ctx, signingKeyPub.GetKID())
if err == nil {
// if the remote track succeeded, remove local tracks
// (this also removes any snoozes)
e.removeLocalTracks()
}
}
if err == nil {
// Remove these after desktop notification change complete:
e.G().NotifyRouter.HandleUserChanged(e.arg.Me.GetUID())
e.G().NotifyRouter.HandleUserChanged(e.them.GetUID())
// Keep these:
e.G().NotifyRouter.HandleTrackingChanged(e.arg.Me.GetUID(), e.arg.Me.GetName())
e.G().NotifyRouter.HandleTrackingChanged(e.them.GetUID(), e.them.GetName())
// Dismiss any associated gregor item.
if outcome.ResponsibleGregorItem != nil {
err = e.G().GregorDismisser.DismissItem(outcome.ResponsibleGregorItem.Metadata().MsgID())
}
}
return err
}
func (e *TrackToken) isTrackTokenStale(o *libkb.IdentifyOutcome) (err error) {
if idt := e.arg.Me.IDTable(); idt == nil {
return nil
} else if tm := idt.GetTrackMap(); tm == nil {
return nil
} else if v := tm[o.Username]; len(v) == 0 {
return nil
} else if lastTrack := v[len(v)-1]; lastTrack != nil && !lastTrack.IsRevoked() && o.TrackUsed == nil {
// If we had a valid track that we didn't use in the identification, then
// someone must have slipped in before us. Distinguish this case from the
// other case below for the purposes of testing, to make sure we hit
// both error cases in our tests.
return libkb.TrackStaleError{FirstTrack: true}
} else if o.TrackUsed == nil || lastTrack == nil {
return nil
} else if o.TrackUsed.GetTrackerSeqno() < lastTrack.GetSeqno() {
// Similarly, if there was a last track for this user that wasn't the
// one we were expecting, someone also must have intervened.
e.G().Log.Debug("Stale track! We were at seqno %d, but %d is already in chain", o.TrackUsed.GetTrackerSeqno(), lastTrack.GetSeqno())
return libkb.TrackStaleError{FirstTrack: false}
}
return nil
}
func (e *TrackToken) loadMe() error {
if e.arg.Me != nil {
return nil
}
me, err := libkb.LoadMe(libkb.NewLoadUserArg(e.G()))
if err != nil {
return err
}
e.arg.Me = me
return nil
}
func (e *TrackToken) loadThem(username string) error {
them, err := libkb.LoadUser(libkb.NewLoadUserByNameArg(e.G(), username))
if err != nil {
return err
}
e.them = them
return nil
}
func (e *TrackToken) storeLocalTrack() error {
return libkb.StoreLocalTrack(e.arg.Me.GetUID(), e.them.GetUID(), e.arg.Options.ExpiringLocal, e.trackStatement, e.G())
}
func (e *TrackToken) storeRemoteTrack(ctx *Context, pubKID keybase1.KID) (err error) {
e.G().Log.Debug("+ StoreRemoteTrack")
defer func() {
e.G().Log.Debug("- StoreRemoteTrack -> %s", libkb.ErrToOk(err))
}()
// need unlocked signing key
ska := libkb.SecretKeyArg{
Me: e.arg.Me,
KeyType: libkb.DeviceSigningKeyType,
}
arg := ctx.SecretKeyPromptArg(ska, "tracking signature")
signingKey, err := e.G().Keyrings.GetSecretKeyWithPrompt(arg)
if err != nil {
return err
}
if signingKey == nil {
return libkb.NoSecretKeyError{}
}
// double-check that the KID of the unlocked key matches
if signingKey.GetKID().NotEqual(pubKID) {
return errors.New("unexpeceted KID mismatch between locked and unlocked signing key")
}
sig, sigid, err := signingKey.SignToString(e.trackStatementBytes)
if err != nil {
return err
}
_, err = e.G().API.Post(libkb.APIArg{
Endpoint: "follow",
NeedSession: true,
Args: libkb.HTTPArgs{
"sig_id_base": libkb.S{Val: sigid.ToString(false)},
"sig_id_short": libkb.S{Val: sigid.ToShortID()},
"sig": libkb.S{Val: sig},
"uid": libkb.UIDArg(e.them.GetUID()),
"type": libkb.S{Val: "track"},
"signing_kid": signingKey.GetKID(),
},
})
if err != nil {
e.G().Log.Info("api error: %s", err)
return err
}
linkid := libkb.ComputeLinkID(e.trackStatementBytes)
e.arg.Me.SigChainBump(linkid, sigid)
return err
}
func (e *TrackToken) removeLocalTracks() (err error) {
defer e.G().Trace("removeLocalTracks", func() error { return err })()
err = libkb.RemoveLocalTracks(e.arg.Me.GetUID(), e.them.GetUID(), e.G())
return err
}