forked from keybase/client
/
pgp_purge.go
164 lines (139 loc) · 3.61 KB
/
pgp_purge.go
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// Copyright 2016 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package engine
import (
"bytes"
"fmt"
"os"
"path/filepath"
"github.com/keybase/client/go/libkb"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
)
// PGPPurge is an engine.
type PGPPurge struct {
libkb.Contextified
arg keybase1.PGPPurgeArg
me *libkb.User
filenames []string
}
// NewPGPPurge creates a PGPPurge engine.
func NewPGPPurge(g *libkb.GlobalContext, arg keybase1.PGPPurgeArg) *PGPPurge {
return &PGPPurge{
Contextified: libkb.NewContextified(g),
arg: arg,
}
}
// Name is the unique engine name.
func (e *PGPPurge) Name() string {
return "PGPPurge"
}
// GetPrereqs returns the engine prereqs.
func (e *PGPPurge) Prereqs() Prereqs {
return Prereqs{
Device: true,
}
}
// RequiredUIs returns the required UIs.
func (e *PGPPurge) RequiredUIs() []libkb.UIKind {
return []libkb.UIKind{}
}
// SubConsumers returns the other UI consumers for this engine.
func (e *PGPPurge) SubConsumers() []libkb.UIConsumer {
return []libkb.UIConsumer{
&SaltpackEncrypt{},
}
}
// Run starts the engine.
func (e *PGPPurge) Run(ctx *Context) error {
me, err := libkb.LoadMe(libkb.NewLoadUserPubOptionalArg(e.G()))
if err != nil {
return err
}
e.me = me
// get all PGP blocks in keyring
var blocks []*libkb.SKB
kerr := e.G().LoginState().Keyring(func(ring *libkb.SKBKeyringFile) {
blocks, err = ring.AllPGPBlocks()
}, "AllPGPBlocks")
if kerr != nil {
return kerr
}
if err != nil {
return err
}
// export each one to a file
if err := e.exportBlocks(ctx, blocks); err != nil {
return err
}
if e.arg.DoPurge {
// if purge flag set, remove all PGP blocks from keyring and save it
kerr = e.G().LoginState().Keyring(func(ring *libkb.SKBKeyringFile) {
err = ring.RemoveAllPGPBlocks()
if err == nil {
err = ring.Save()
}
}, "RemoveAllPGPBlocks")
if kerr != nil {
return kerr
}
if err != nil {
return err
}
}
return nil
}
// KeyFiles returns the filenames of the exported keys.
func (e *PGPPurge) KeyFiles() []string {
return e.filenames
}
func (e *PGPPurge) exportBlocks(ctx *Context, blocks []*libkb.SKB) error {
sstore := libkb.NewSecretStore(e.G(), e.me.GetNormalizedName())
promptArg := libkb.SecretKeyPromptArg{
SecretUI: ctx.SecretUI,
Reason: "export private PGP key",
}
for i, block := range blocks {
block.SetUID(e.me.GetUID())
key, err := block.PromptAndUnlock(promptArg, sstore, e.me)
if err != nil {
return err
}
pgpKey, ok := key.(*libkb.PGPKeyBundle)
if !ok {
return fmt.Errorf("unlocked key incorrect type")
}
name := fmt.Sprintf("kb-%04d-%s.saltpack", i, pgpKey.GetFingerprint())
path := filepath.Join(e.G().Env.GetConfigDir(), name)
if err := e.encryptToFile(ctx, pgpKey, path); err != nil {
return err
}
e.filenames = append(e.filenames, path)
}
return nil
}
func (e *PGPPurge) encryptToFile(ctx *Context, bundle *libkb.PGPKeyBundle, filename string) error {
out, err := os.Create(filename)
if err != nil {
return err
}
defer out.Close()
var buf bytes.Buffer
if err := bundle.EncodeToStream(libkb.NopWriteCloser{W: &buf}, true); err != nil {
return err
}
arg := &SaltpackEncryptArg{
Source: &buf,
Sink: out,
Opts: keybase1.SaltpackEncryptOptions{
// Signcryption mode would require KBFS and network access, which
// we don't necessarily want. The purge backup isn't expected to
// leave the current device anyway.
EncryptionOnlyMode: true,
},
}
eng := NewSaltpackEncrypt(arg, e.G())
if err := RunEngine(eng, ctx); err != nil {
return err
}
return nil
}