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db.go
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db.go
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// Copyright (c) 2015 Mute Communications Ltd.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cryptengine
import (
"bufio"
"bytes"
"fmt"
"io"
"path/filepath"
"github.com/mutecomm/mute/keydb"
"github.com/mutecomm/mute/log"
"github.com/mutecomm/mute/util/bzero"
)
// create a new KeyDB.
func (ce *CryptEngine) dbCreate(homedir string, iterations int) error {
keydbname := filepath.Join(homedir, "keys")
// read passphrase
log.Infof("read passphrase from fd %d", ce.fileTable.PassphraseFD)
scanner := bufio.NewScanner(ce.fileTable.PassphraseFP)
var passphrase []byte
defer bzero.Bytes(passphrase)
if scanner.Scan() {
passphrase = scanner.Bytes()
} else if err := scanner.Err(); err != nil {
return log.Error(err)
}
// read passphrase again
log.Infof("read passphrase from fd %d again", ce.fileTable.PassphraseFD)
var passphrase2 []byte
defer bzero.Bytes(passphrase2)
if scanner.Scan() {
passphrase2 = scanner.Bytes()
} else if err := scanner.Err(); err != nil {
return log.Error(err)
}
// compare passphrases
if !bytes.Equal(passphrase, passphrase2) {
return log.Error("passphrases differ")
}
// create keyDB
log.Infof("create keyDB '%s'", keydbname)
if err := keydb.Create(keydbname, passphrase, iterations); err != nil {
return err
}
return nil
}
// rekey a KeyDB.
func (ce *CryptEngine) dbRekey(homedir string, iterations int) error {
keydbname := filepath.Join(homedir, "keys")
// read old passphrase
log.Infof("read old passphrase from fd %d", ce.fileTable.PassphraseFD)
scanner := bufio.NewScanner(ce.fileTable.PassphraseFP)
var oldPassphrase []byte
defer bzero.Bytes(oldPassphrase)
if scanner.Scan() {
oldPassphrase = scanner.Bytes()
} else if err := scanner.Err(); err != nil {
return log.Error(err)
}
// read new passphrase
log.Infof("read new passphrase from fd %d", ce.fileTable.PassphraseFD)
var newPassphrase []byte
defer bzero.Bytes(newPassphrase)
if scanner.Scan() {
newPassphrase = scanner.Bytes()
} else if err := scanner.Err(); err != nil {
return log.Error(err)
}
// read new passphrase again
log.Infof("read new passphrase from fd %d again", ce.fileTable.PassphraseFD)
var newPassphrase2 []byte
defer bzero.Bytes(newPassphrase2)
if scanner.Scan() {
newPassphrase2 = scanner.Bytes()
} else if err := scanner.Err(); err != nil {
return log.Error(err)
}
// compare new passphrases
if !bytes.Equal(newPassphrase, newPassphrase2) {
return log.Error("new passphrases differ")
}
// rekey keyDB
log.Infof("rekey keyDB '%s'", keydbname)
if err := keydb.Rekey(keydbname, oldPassphrase, newPassphrase, iterations); err != nil {
return err
}
return nil
}
func (ce *CryptEngine) dbStatus(w io.Writer) error {
autoVacuum, freelistCount, err := ce.keyDB.Status()
if err != nil {
return err
}
fmt.Fprintf(w, "keydb:\n")
fmt.Fprintf(w, "auto_vacuum=%s\n", autoVacuum)
fmt.Fprintf(w, "freelist_count=%d\n", freelistCount)
return nil
}
func (ce *CryptEngine) dbVacuum(autoVacuumMode string) error {
return ce.keyDB.Vacuum(autoVacuumMode)
}
func (ce *CryptEngine) dbIncremental(pagesToRemove int64) error {
return ce.keyDB.Incremental(pagesToRemove)
}
func (ce *CryptEngine) dbVersion(w io.Writer) error {
version, err := ce.keyDB.Version()
if err != nil {
return err
}
fmt.Fprintf(w, "keydb:\n")
fmt.Fprintf(w, "version=%s\n", version)
return nil
}