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vault.go
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vault.go
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package vault
import (
"context"
"fmt"
"io"
"reflect"
"sync"
"time"
"github.com/davecgh/go-spew/spew"
"github.com/burlingtonbertie99/mykeys"
"github.com/burlingtonbertie99/mykeys/dstore"
"github.com/burlingtonbertie99/mykeys/tsutil"
"github.com/pkg/errors"
"github.com/vmihailenco/msgpack/v4"
)
// ErrNotOpen if you try to use the vault when it isn't open.
var ErrNotOpen = errors.Errorf("vault not open")
// ErrAlreadyOpen if you try to open when it is already open.
var ErrAlreadyOpen = errors.Errorf("vault already open")
// Vault stores keys and secrets.
type Vault struct {
mtx sync.Mutex
store Store
client *Client
clock tsutil.Clock
mk *[32]byte
remote *Remote
auto *time.Timer
checkedAt time.Time
checkMtx sync.Mutex
}
// New vault.
func New(st Store, opt ...Option) *Vault {
opts := newOptions(opt...)
return &Vault{
store: st,
clock: opts.Clock,
}
}
// Now is current time.
func (v *Vault) Now() time.Time {
return v.clock.Now()
}
// Store used by vault.
func (v *Vault) Store() Store {
return v.store
}
// Open vault.
func (v *Vault) Open() error {
if err := v.store.Open(); err != nil {
return errors.Wrapf(err, "failed to open vault")
}
return nil
}
// Close vault.
func (v *Vault) Close() error {
if v.auto != nil {
v.auto.Stop()
v.auto = nil
}
// TODO: Sync could still be running when we close, this might be
// ok, since it will error and eventually stop?
if err := v.store.Close(); err != nil {
return errors.Wrapf(err, "failed to close vault")
}
return nil
}
// Reset vault.
func (v *Vault) Reset() error {
status, err := v.Status()
if err != nil {
return err
}
if status == Unlocked {
return errors.Errorf("failed to reset: vault is unlocked")
}
if err := v.store.Reset(); err != nil {
return errors.Wrapf(err, "failed to reset vault")
}
return nil
}
// SetClient sets the client.
func (v *Vault) SetClient(client *Client) {
v.client = client
}
// setMasterKey sets the master key.
func (v *Vault) setMasterKey(mk *[32]byte) error {
if err := v.setAuthFromMasterKey(mk); err != nil {
return err
}
v.mk = mk
return nil
}
func (v *Vault) setAuthFromMasterKey(mk *[32]byte) error {
rsalt, err := v.getRemoteSalt(true)
if err != nil {
return err
}
// Derive API key
seed := keys.Bytes32(keys.HKDFSHA256(mk[:], 32, rsalt, []byte("keys.pub/rk")))
rk := keys.NewEdX25519KeyFromSeed(seed)
remote := &Remote{Key: rk, Salt: rsalt}
// If auth was already set in Clone, we should double check it matches the
// auth generated from the master key.
if v.remote != nil {
if !reflect.DeepEqual(v.remote, remote) {
return errors.Errorf("remote auth is different than expected")
}
}
v.remote = remote
return nil
}
func (v *Vault) clearRemote() error {
v.remote = nil
if err := v.setRemoteSalt(nil); err != nil {
return err
}
if v.mk != nil {
if err := v.setAuthFromMasterKey(v.mk); err != nil {
return err
}
}
return nil
}
// MasterKey returns master key, if unlocked.
// The master key is used to encrypt items in the vault.
// It's not recommended to use this key for anything other than possibly
// deriving new keys.
// TODO: Point to spec.
func (v *Vault) MasterKey() *[32]byte {
return v.mk
}
// Set vault item.
func (v *Vault) Set(item *Item) error {
return v.setItem(item, true)
}
func (v *Vault) setItem(item *Item, addToPush bool) error {
b, err := encryptItem(item, v.mk)
if err != nil {
return err
}
path := dstore.Path("item", item.ID)
return v.set(path, b, addToPush)
}
func (v *Vault) set(path string, b []byte, addToPush bool) error {
if err := v.store.Set(path, b); err != nil {
return err
}
if addToPush {
return v.addToPush(path, b)
}
return nil
}
func (v *Vault) addToPush(path string, b []byte) error {
inc, err := v.pushIndexNext()
if err != nil {
return err
}
push := dstore.Path("push", pad(inc), path)
if err := v.store.Set(push, b); err != nil {
return err
}
if v.auto != nil {
v.auto.Stop()
v.auto = nil
}
v.auto = time.AfterFunc(time.Second*2, func() {
if _, err := v.CheckSync(context.TODO(), time.Duration(0)); err != nil {
logger.Errorf("Failed to check sync: %v", err)
}
})
return nil
}
// Get vault item.
func (v *Vault) Get(id string) (*Item, error) {
if id == "" {
return nil, errors.Errorf("empty id")
}
path := dstore.Path("item", id)
b, err := v.store.Get(path)
if err != nil {
return nil, err
}
if b == nil {
logger.Debugf("Path not found %s", path)
return nil, nil
}
item, err := decryptItem(b, v.mk, id)
if err != nil {
return nil, err
}
if item == nil {
return nil, nil
}
if item.ID != id {
return nil, errors.Errorf("item id mismatch %s != %s", item.ID, id)
}
if len(item.Data) == 0 {
return nil, nil
}
return item, err
}
// Delete vault item.
func (v *Vault) Delete(id string) (bool, error) {
item, err := v.Get(id)
if err != nil {
return false, err
}
if item == nil {
return false, nil
}
// Delete clears bytes
item.Data = nil
if err := v.setItem(item, true); err != nil {
return false, err
}
return true, nil
}
// Items to list.
func (v *Vault) Items() ([]*Item, error) {
path := dstore.Path("item")
ds, err := v.store.List(&ListOptions{Prefix: path})
if err != nil {
return nil, err
}
items := []*Item{}
for _, doc := range ds {
id := dstore.PathLast(doc.Path)
item, err := decryptItem(doc.Data, v.mk, id)
if err != nil {
return nil, err
}
if len(item.Data) == 0 {
// TODO: Deleted item (clean it up by removing?)
continue
}
items = append(items, item)
}
return items, nil
}
func (v *Vault) push(ctx context.Context) error {
if v.client == nil {
return errors.Errorf("no vault client set")
}
if v.remote == nil {
return errors.Errorf("no remote set")
}
paths := []string{}
events := []*Event{}
// Get events from push.
path := dstore.Path("push")
ds, err := v.store.List(&ListOptions{Prefix: path})
if err != nil {
return err
}
for _, doc := range ds {
logger.Debugf("Push %s", doc.Path)
paths = append(paths, doc.Path)
path := dstore.PathFrom(doc.Path, 2)
event := &Event{Path: path, Data: doc.Data}
events = append(events, event)
}
if len(events) > 0 {
logger.Infof("Pushing %d vault events", len(events))
if err := v.client.VaultSend(ctx, v.remote.Key, events); err != nil {
return err
}
logger.Infof("Removing %d from push", len(paths))
if err := deleteAll(v.store, paths); err != nil {
return err
}
}
return nil
}
// Pull events from remote.
// Does NOT require Unlock.
func (v *Vault) Pull(ctx context.Context) error {
v.mtx.Lock()
defer v.mtx.Unlock()
return v.pull(ctx)
}
func (v *Vault) pull(ctx context.Context) error {
// Keep pulling until no more.
for {
truncated, err := v.pullNext(ctx)
if err != nil {
return err
}
if !truncated {
break
}
}
return nil
}
func (v *Vault) pullNext(ctx context.Context) (bool, error) {
if v.client == nil {
return false, errors.Errorf("no vault client set")
}
if v.remote == nil {
return false, errors.Errorf("no remote set")
}
index, err := v.pullIndex()
if err != nil {
return false, err
}
logger.Infof("Pulling vault items")
vault, err := v.client.Vault(ctx, v.remote.Key, index)
if err != nil {
return false, err
}
if err := v.saveRemoteVault(vault); err != nil {
return false, err
}
return vault.Truncated, nil
}
func (v *Vault) saveRemoteVault(vault *Events) error {
if vault == nil {
return errors.Errorf("vault not found")
}
for _, event := range vault.Events {
logger.Debugf("Pull %s", event.Path)
if event.Path == "" {
return errors.Errorf("invalid event (no path)")
}
if len(event.Data) == 0 {
logger.Debugf("Deleting %s", event.Path)
if _, err := v.store.Delete(event.Path); err != nil {
return err
}
} else {
logger.Debugf("Setting %s", event.Path)
if err := v.store.Set(event.Path, event.Data); err != nil {
return err
}
}
pull := dstore.Path("pull", pad(event.RemoteIndex), event.Path)
eb, err := msgpack.Marshal(event)
if err != nil {
return err
}
if err := v.store.Set(pull, eb); err != nil {
return err
}
}
// Update pull index.
if err := v.setPullIndex(vault.Index); err != nil {
return err
}
return nil
}
// Spew to out.
func (v *Vault) Spew(prefix string, out io.Writer) error {
docs, err := v.store.List(&ListOptions{Prefix: prefix})
if err != nil {
return err
}
if _, err := out.Write([]byte(fmt.Sprintf("%s\n", spew.Sdump(docs)))); err != nil {
return err
}
return nil
}
// IsEmpty returns true if vault is empty.
func (v *Vault) IsEmpty() (bool, error) {
docs, err := v.store.List(&ListOptions{Limit: 1})
if err != nil {
return false, err
}
return len(docs) == 0, nil
}