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source.go
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source.go
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/*
* Copyright (c) 2019-2021. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package vault
import (
"crypto/md5"
"encoding/base64"
"fmt"
"io/ioutil"
"sync"
"time"
json "github.com/pydio/cells/x/jsonx"
"os"
"github.com/pydio/cells/common"
"github.com/pydio/cells/common/config/micro/file"
"github.com/pydio/cells/common/crypto"
"github.com/pydio/cells/x/filex"
"github.com/pydio/go-os/config"
)
type VaultSource struct {
config.Source
opts config.SourceOptions
skipKeyring bool
storePath string
vaultKeyPath string
masterPass []byte
masterKey []byte
data map[string]string
dataLock *sync.Mutex
}
type Writer interface {
Write(cs *config.ChangeSet) error
}
func NewVaultSource(storePath string, keyPath string, skipKeyring bool, opts ...config.SourceOption) config.Source {
var options config.SourceOptions
for _, o := range opts {
o(&options)
}
if len(options.Name) == 0 {
options.Name = config.DefaultSourceName
}
v := &VaultSource{
Source: file.NewSource(config.SourceName(storePath)),
opts: options,
storePath: storePath,
vaultKeyPath: keyPath,
skipKeyring: skipKeyring,
data: make(map[string]string),
dataLock: &sync.Mutex{},
}
v.initMasterPassword()
return v
}
// Loads ChangeSet from the source
func (v *VaultSource) Read() (*config.ChangeSet, error) {
// Now load data and decypher
v.dataLock.Lock()
defer v.dataLock.Unlock()
content, err := ioutil.ReadFile(v.storePath)
if err == nil {
var data map[string]string
if e := json.Unmarshal(content, &data); e != nil {
return nil, e
}
for k, val := range data {
if dec, e := v.decrypt(val); e == nil {
v.data[k] = string(dec)
}
}
}
// Add masterPassword for backward compatibility
v.data["masterPassword"] = string(v.masterPass)
b, err := json.Marshal(v.data)
if err != nil {
return nil, err
}
h := md5.New()
h.Write(b)
checksum := fmt.Sprintf("%x", h.Sum(nil))
return &config.ChangeSet{
Source: "vault",
Timestamp: time.Now(),
Data: b,
Checksum: checksum,
}, nil
}
// Watch for source changes Returns the entire changeset
func (v *VaultSource) Watch() (config.SourceWatcher, error) {
return nil, nil
}
// Name of source
func (v *VaultSource) String() string {
return "vault"
}
func (v *VaultSource) Write(cs *config.ChangeSet) error {
data := make(map[string]string)
//fmt.Println("Writing data to vault ", string(cs.Data))
err := json.Unmarshal(cs.Data, &data)
if err != nil {
return err
}
for k, val := range data {
if k == "masterPassword" {
continue
}
enc, e := v.encrypt([]byte(val))
if e != nil {
return e
}
data[k] = enc
}
return filex.Save(v.storePath, data)
}
// Set sets a key/value in memory (not encrypted)
func (v *VaultSource) Set(key string, value string, save bool) error {
v.dataLock.Lock()
defer v.dataLock.Unlock()
v.data[key] = value
if save {
return v.save()
} else {
return nil
}
}
// Delete removes a key from memory
func (v *VaultSource) Delete(key string, save bool) error {
v.dataLock.Lock()
defer v.dataLock.Unlock()
delete(v.data, key)
if save {
return v.save()
} else {
return nil
}
}
// Save encrypts values and save to file
func (v *VaultSource) save() error {
data := make(map[string]interface{})
for k, val := range v.data {
if k == "masterPassword" {
continue
}
enc, e := v.encrypt([]byte(val))
if e != nil {
return e
}
data[k] = enc
}
return filex.Save(v.storePath, data)
}
func (v *VaultSource) initMasterPassword() {
var kPass []byte
if !v.skipKeyring {
var e error
kPass, e = crypto.GetKeyringPassword(common.ServiceGrpcNamespace_+common.ServiceUserKey, common.KeyringMasterKey, false)
// Keyring seems accessible - use it
if e == nil && len(kPass) == 0 {
// Check if it may have been already initiated without keyring previously
if fPass := v.getStorePassword(false); len(fPass) > 0 {
if e := crypto.SetKeyringPassword(common.ServiceGrpcNamespace_+common.ServiceUserKey, common.KeyringMasterKey, fPass); e == nil {
fmt.Println("Migrated master key from local storage to keyring - removing stored file")
os.Remove(v.vaultKeyPath)
kPass = fPass
} else {
fmt.Println("Tried to store master key in keyring but it failed - switching to local storage")
}
} else {
fmt.Println("Generating a new master key from keyring")
if kPass, e = crypto.GetKeyringPassword(common.ServiceGrpcNamespace_+common.ServiceUserKey, common.KeyringMasterKey, true); e != nil {
fmt.Println("Tried to generate master key in keyring but it failed - switching to local storage")
}
}
}
}
if kPass == nil || len(kPass) == 0 {
kPass = v.getStorePassword(true)
}
v.masterPass = kPass
v.masterKey = crypto.KeyFromPassword(v.masterPass, 32)
}
// getStorePassword gets or generate a master key from file instead of keyring
func (v *VaultSource) getStorePassword(createIfNotExists bool) []byte {
if s, e := ioutil.ReadFile(v.vaultKeyPath); e == nil {
return s
} else if createIfNotExists {
k := v.generateStorePassword()
fmt.Println("**************************************************************")
fmt.Println(" Warning! A keyring is not found on this machine, ")
fmt.Println(" A Master Key has been created for cyphering secrets ")
fmt.Println(" It has been stored in " + v.vaultKeyPath + " ")
fmt.Println(" Please make sure to secure this file and update the configs")
fmt.Println(" with its new location, under the defaults/keyPath key. ")
fmt.Println("***************************************************************")
ioutil.WriteFile(v.vaultKeyPath, k, 0400)
return k
}
return []byte{}
}
// generateStorePassword creates a new random password for encryption
func (v *VaultSource) generateStorePassword() []byte {
pass, _ := crypto.RandomBytes(50)
return pass
}
// encrypt encrypts and base64 encode result to string
func (v *VaultSource) encrypt(data []byte) (string, error) {
sealed, e := crypto.Seal(v.masterKey, data)
if e != nil {
return "", e
}
return base64.StdEncoding.EncodeToString(sealed), nil
}
// encrypt base64 decode and decrypt result to []byte
func (v *VaultSource) decrypt(value string) ([]byte, error) {
if data, e := base64.StdEncoding.DecodeString(value); e != nil {
return []byte{}, e
} else {
return crypto.Open(v.masterKey, data[:12], data[12:])
}
}