func (l *SigChainLoader) LoadLinksFromStorage() (err error) {
var curr LinkID
var links []*ChainLink
var mt *MerkleTriple
goodKey := true
uid := l.user.GetUID()
l.G().Log.Debug("+ SigChainLoader.LoadFromStorage(%s)", uid)
defer func() { l.G().Log.Debug("- SigChainLoader.LoadFromStorage(%s) -> %s", uid, ErrToOk(err)) }()
if mt, err = l.LoadLastLinkIDFromStorage(); err != nil || mt == nil {
l.G().Log.Debug("| Failed to load last link ID")
if err == nil {
l.G().Log.Debug("| no error loading last link ID from storage")
}
if mt == nil {
l.G().Log.Debug("| mt (MerkleTriple) nil result from load last link ID from storage")
}
return err
}
// Load whatever the last fingerprint was in the chain if we're not loading
// allKeys. We have to load something... Note that we don't use l.fp
// here (as we used to) since if the user used to have chainlinks, and then
// removed their key, we still want to load their last chainlinks.
var loadKID keybase1.KID
curr = mt.LinkID
var link *ChainLink
suid := l.selfUID()
for curr != nil && goodKey {
l.G().VDL.Log(VLog1, "| loading link; curr=%s", curr)
if link, err = ImportLinkFromStorage(curr, suid, l.G()); err != nil {
return
}
kid2 := link.ToEldestKID()
if loadKID.IsNil() {
loadKID = kid2
l.G().Log.Debug("| Setting loadKID=%s", kid2)
} else if !l.allKeys && loadKID.Exists() && !loadKID.Equal(kid2) {
goodKey = false
l.G().Log.Debug("| Stop loading at KID=%s (!= KID=%s)", loadKID, kid2)
}
if goodKey {
links = append(links, link)
curr = link.GetPrev()
}
}
reverse(links)
l.G().Log.Debug("| Loaded %d links", len(links))
l.links = links
return
}
// To add a device key as the eldest key, signer and eldestKID
// should be nil.
func (d *Locksmith) addDeviceKeyWithSigner(ctx *Context, signer libkb.GenericKey, eldestKID keybase1.KID) error {
devname, err := d.deviceName(ctx)
if err != nil {
return err
}
pps, err := d.ppStream(ctx)
if err != nil {
return err
}
d.lks = libkb.NewLKSec(pps, d.arg.User.GetUID(), d.G())
args := &DeviceWrapArgs{
Me: d.arg.User,
DeviceName: devname,
DeviceType: libkb.DeviceTypeDesktop,
Lks: d.lks,
IsEldest: false,
Signer: signer,
EldestKID: eldestKID,
}
if signer == nil && eldestKID.IsNil() {
args.IsEldest = true
}
eng := NewDeviceWrap(args, d.G())
if err := RunEngine(eng, ctx); err != nil {
return err
}
d.signingKey = eng.SigningKey()
return nil
}
func (sc *SigChain) VerifySigsAndComputeKeys(eldest keybase1.KID, ckf *ComputedKeyFamily) (cached bool, err error) {
cached = false
sc.G().Log.Debug("+ VerifySigsAndComputeKeys for user %s (eldest = %s)", sc.uid, eldest)
defer func() {
sc.G().Log.Debug("- VerifySigsAndComputeKeys for user %s -> %s", sc.uid, ErrToOk(err))
}()
if err = sc.VerifyChain(); err != nil {
return
}
if sc.allKeys || sc.loadedFromLinkOne {
if first := sc.getFirstSeqno(); first > Seqno(1) {
err = ChainLinkWrongSeqnoError{fmt.Sprintf("Wanted a chain from seqno=1, but got seqno=%d", first)}
return
}
}
if ckf.kf == nil || eldest.IsNil() {
sc.G().Log.Debug("| VerifyWithKey short-circuit, since no Key available")
sc.localCki = NewComputedKeyInfos(sc.G())
ckf.cki = sc.localCki
return
}
links, err := sc.GetCurrentSubchain(eldest)
if err != nil {
return
}
if links == nil || len(links) == 0 {
sc.G().Log.Debug("| Empty chain after we limited to eldest %s", eldest)
eldestKey, _ := ckf.FindKeyWithKIDUnsafe(eldest)
sc.localCki = NewComputedKeyInfos(sc.G())
err = sc.localCki.InsertServerEldestKey(eldestKey, sc.username)
ckf.cki = sc.localCki
return
}
if cached, ckf.cki, err = sc.verifySubchain(*ckf.kf, links); err != nil {
return
}
// We used to check for a self-signature of one's keybase username
// here, but that doesn't make sense because we haven't accounted
// for revocations. We'll go it later, after reconstructing
// the id_table. See LoadUser in user.go and
// https://github.com/keybase/go/issues/43
return
}
// GetEncryptionSubkeyForDevice gets the current encryption subkey for the given
// device. Note that many devices might share an encryption public key but
// might have different secret keys.
func (ckf *ComputedKeyFamily) GetEncryptionSubkeyForDevice(did keybase1.DeviceID) (key GenericKey, err error) {
var kid keybase1.KID
if kid, err = ckf.getSibkeyKidForDevice(did); err != nil {
return
}
if kid.IsNil() {
return
}
if cki, found := ckf.cki.Infos[kid]; !found {
return
} else if !cki.Subkey.IsValid() {
return
} else {
key, err = ckf.FindActiveEncryptionSubkey(cki.Subkey)
}
return
}