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libgocryptfs
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readpassword: convert from string to []byte 

This will allows us to overwrite the password
with zeros once we are done with it.

https://github.com/rfjakob/gocryptfs/issues/211
This commit is contained in:
Jakob Unterwurzacher 2018-02-18 14:26:54 +01:00
parent 14c063428d
commit 3b8f5cbb17
10 changed files with 47 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
internal/configfile/config_file.go
View File

@ -67,7 +67,7 @@ func randBytesDevRandom(n int) []byte {
// CreateConfFile - create a new config with a random key encrypted with
// "password" and write it to "filename".
// Uses scrypt with cost parameter logN.
func CreateConfFile(filename string, password string, plaintextNames bool, logN int, creator string, aessiv bool, devrandom bool) error {
func CreateConfFile(filename string, password []byte, plaintextNames bool, logN int, creator string, aessiv bool, devrandom bool) error {
var cf ConfFile
cf.filename = filename
cf.Creator = creator
@ -114,7 +114,7 @@ func CreateConfFile(filename string, password string, plaintextNames bool, logN
//
// If "password" is empty, the config file is read
// but the key is not decrypted (returns nil in its place).
func LoadConfFile(filename string, password string) ([]byte, *ConfFile, error) {
func LoadConfFile(filename string, password []byte) ([]byte, *ConfFile, error) {
var cf ConfFile
cf.filename = filename
@ -171,7 +171,7 @@ func LoadConfFile(filename string, password string) ([]byte, *ConfFile, error) {
return nil, nil, fmt.Errorf("Deprecated filesystem")
}
if password == "" {
if len(password) == 0 {
// We have validated the config file, but without a password we cannot
// decrypt the master key. Return only the parsed config.
return nil, &cf, nil
@ -199,7 +199,7 @@ func LoadConfFile(filename string, password string) ([]byte, *ConfFile, error) {
// and store it in cf.EncryptedKey.
// Uses scrypt with cost parameter logN and stores the scrypt parameters in
// cf.ScryptObject.
func (cf *ConfFile) EncryptKey(key []byte, password string, logN int) {
func (cf *ConfFile) EncryptKey(key []byte, password []byte, logN int) {
// Generate scrypt-derived key from password
cf.ScryptObject = NewScryptKDF(logN)
scryptHash := cf.ScryptObject.DeriveKey(password)

26
internal/configfile/config_test.go
View File

@ -8,8 +8,10 @@ import (
"github.com/rfjakob/gocryptfs/internal/tlog"
)
var testPw = []byte("test")
func TestLoadV1(t *testing.T) {
_, _, err := LoadConfFile("config_test/v1.conf", "test")
_, _, err := LoadConfFile("config_test/v1.conf", testPw)
if err == nil {
t.Errorf("Outdated v1 config file must fail to load but it didn't")
} else if testing.Verbose() {
@ -22,7 +24,7 @@ func TestLoadV1(t *testing.T) {
func TestLoadV2(t *testing.T) {
t1 := time.Now()
_, _, err := LoadConfFile("config_test/v2.conf", "test")
_, _, err := LoadConfFile("config_test/v2.conf", testPw)
if err != nil {
t.Errorf("Could not load v2 config file: %v", err)
}
@ -37,21 +39,21 @@ func TestLoadV2PwdError(t *testing.T) {
if !testing.Verbose() {
tlog.Warn.Enabled = false
}
_, _, err := LoadConfFile("config_test/v2.conf", "wrongpassword")
_, _, err := LoadConfFile("config_test/v2.conf", []byte("wrongpassword"))
if err == nil {
t.Errorf("Loading with wrong password must fail but it didn't")
}
}
func TestLoadV2Feature(t *testing.T) {
_, _, err := LoadConfFile("config_test/PlaintextNames.conf", "test")
_, _, err := LoadConfFile("config_test/PlaintextNames.conf", testPw)
if err != nil {
t.Errorf("Could not load v2 PlaintextNames config file: %v", err)
}
}
func TestLoadV2StrangeFeature(t *testing.T) {
_, _, err := LoadConfFile("config_test/StrangeFeature.conf", "test")
_, _, err := LoadConfFile("config_test/StrangeFeature.conf", testPw)
if err == nil {
t.Errorf("Loading unknown feature must fail but it didn't")
} else if testing.Verbose() {
@ -60,11 +62,11 @@ func TestLoadV2StrangeFeature(t *testing.T) {
}
func TestCreateConfDefault(t *testing.T) {
err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", false, false)
err := CreateConfFile("config_test/tmp.conf", testPw, false, 10, "test", false, false)
if err != nil {
t.Fatal(err)
}
_, c, err := LoadConfFile("config_test/tmp.conf", "test")
_, c, err := LoadConfFile("config_test/tmp.conf", testPw)
if err != nil {
t.Fatal(err)
}
@ -81,18 +83,18 @@ func TestCreateConfDefault(t *testing.T) {
}
func TestCreateConfDevRandom(t *testing.T) {
err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", false, true)
err := CreateConfFile("config_test/tmp.conf", testPw, false, 10, "test", false, true)
if err != nil {
t.Fatal(err)
}
}
func TestCreateConfPlaintextnames(t *testing.T) {
err := CreateConfFile("config_test/tmp.conf", "test", true, 10, "test", false, false)
err := CreateConfFile("config_test/tmp.conf", testPw, true, 10, "test", false, false)
if err != nil {
t.Fatal(err)
}
_, c, err := LoadConfFile("config_test/tmp.conf", "test")
_, c, err := LoadConfFile("config_test/tmp.conf", testPw)
if err != nil {
t.Fatal(err)
}
@ -109,11 +111,11 @@ func TestCreateConfPlaintextnames(t *testing.T) {
// Reverse mode uses AESSIV
func TestCreateConfFileAESSIV(t *testing.T) {
err := CreateConfFile("config_test/tmp.conf", "test", false, 10, "test", true, false)
err := CreateConfFile("config_test/tmp.conf", testPw, false, 10, "test", true, false)
if err != nil {
t.Fatal(err)
}
_, c, err := LoadConfFile("config_test/tmp.conf", "test")
_, c, err := LoadConfFile("config_test/tmp.conf", testPw)
if err != nil {
t.Fatal(err)
}

4
internal/configfile/scrypt.go
View File

@ -61,10 +61,10 @@ func NewScryptKDF(logN int) ScryptKDF {
}
// DeriveKey returns a new key from a supplied password.
func (s *ScryptKDF) DeriveKey(pw string) []byte {
func (s *ScryptKDF) DeriveKey(pw []byte) []byte {
s.validateParams()
k, err := scrypt.Key([]byte(pw), s.Salt, s.N, s.R, s.P, s.KeyLen)
k, err := scrypt.Key(pw, s.Salt, s.N, s.R, s.P, s.KeyLen)
if err != nil {
log.Panicf("DeriveKey failed: %v", err)
}

2
internal/configfile/scrypt_test.go
View File

@ -23,7 +23,7 @@ ok github.com/rfjakob/gocryptfs/cryptfs 18.772s
func benchmarkScryptN(n int, b *testing.B) {
kdf := NewScryptKDF(n)
for i := 0; i < b.N; i++ {
kdf.DeriveKey("test")
kdf.DeriveKey(testPw)
}
}

8
internal/readpassword/extpass_test.go
View File

@ -8,6 +8,8 @@ import (
"github.com/rfjakob/gocryptfs/internal/tlog"
)
var testPw = []byte("test")
func TestMain(m *testing.M) {
// Shut up info output
tlog.Info.Enabled = false
@ -16,7 +18,7 @@ func TestMain(m *testing.M) {
func TestExtpass(t *testing.T) {
p1 := "ads2q4tw41reg52"
p2 := readPasswordExtpass("echo " + p1)
p2 := string(readPasswordExtpass("echo " + p1))
if p1 != p2 {
t.Errorf("p1=%q != p2=%q", p1, p2)
}
@ -24,7 +26,7 @@ func TestExtpass(t *testing.T) {
func TestOnceExtpass(t *testing.T) {
p1 := "lkadsf0923rdfi48rqwhdsf"
p2 := Once("echo " + p1)
p2 := string(Once("echo " + p1))
if p1 != p2 {
t.Errorf("p1=%q != p2=%q", p1, p2)
}
@ -32,7 +34,7 @@ func TestOnceExtpass(t *testing.T) {
func TestTwiceExtpass(t *testing.T) {
p1 := "w5w44t3wfe45srz434"
p2 := Once("echo " + p1)
p2 := string(Once("echo " + p1))
if p1 != p2 {
t.Errorf("p1=%q != p2=%q", p1, p2)
}

19
internal/readpassword/read.go
View File

@ -2,6 +2,7 @@
package readpassword
import (
"bytes"
"fmt"
"io"
"os"
@ -23,7 +24,7 @@ const (
// Once tries to get a password from the user, either from the terminal, extpass
// or stdin.
func Once(extpass string) string {
func Once(extpass string) []byte {
if extpass != "" {
return readPasswordExtpass(extpass)
}
@ -35,7 +36,7 @@ func Once(extpass string) string {
// Twice is the same as Once but will prompt twice if we get the password from
// the terminal.
func Twice(extpass string) string {
func Twice(extpass string) []byte {
if extpass != "" {
return readPasswordExtpass(extpass)
}
@ -44,7 +45,7 @@ func Twice(extpass string) string {
}
p1 := readPasswordTerminal("Password: ")
p2 := readPasswordTerminal("Repeat: ")
if p1 != p2 {
if !bytes.Equal(p1, p2) {
tlog.Fatal.Println("Passwords do not match")
os.Exit(exitcodes.ReadPassword)
}
@ -53,7 +54,7 @@ func Twice(extpass string) string {
// readPasswordTerminal reads a line from the terminal.
// Exits on read error or empty result.
func readPasswordTerminal(prompt string) string {
func readPasswordTerminal(prompt string) []byte {
fd := int(os.Stdin.Fd())
fmt.Fprintf(os.Stderr, prompt)
// terminal.ReadPassword removes the trailing newline
@ -67,12 +68,12 @@ func readPasswordTerminal(prompt string) string {
tlog.Fatal.Println("Password is empty")
os.Exit(exitcodes.PasswordEmpty)
}
return string(p)
return p
}
// readPasswordStdin reads a line from stdin.
// It exits with a fatal error on read error or empty result.
func readPasswordStdin() string {
func readPasswordStdin() []byte {
tlog.Info.Println("Reading password from stdin")
p := readLineUnbuffered(os.Stdin)
if len(p) == 0 {
@ -85,7 +86,7 @@ func readPasswordStdin() string {
// readPasswordExtpass executes the "extpass" program and returns the first line
// of the output.
// Exits on read error or empty result.
func readPasswordExtpass(extpass string) string {
func readPasswordExtpass(extpass string) []byte {
tlog.Info.Println("Reading password from extpass program")
var parts []string
// The option "-passfile=FILE" gets transformed to
@ -125,7 +126,7 @@ func readPasswordExtpass(extpass string) string {
// readLineUnbuffered reads single bytes from "r" util it gets "\n" or EOF.
// The returned string does NOT contain the trailing "\n".
func readLineUnbuffered(r io.Reader) (l string) {
func readLineUnbuffered(r io.Reader) (l []byte) {
b := make([]byte, 1)
for {
if len(l) > maxPasswordLen {
@ -146,7 +147,7 @@ func readLineUnbuffered(r io.Reader) (l string) {
if b[0] == '\n' {
return l
}
l = l + string(b)
l = append(l, b...)
}
}

4
internal/readpassword/stdin_test.go
View File

@ -11,7 +11,7 @@ import (
func TestStdin(t *testing.T) {
p1 := "g55434t55wef"
if os.Getenv("TEST_SLAVE") == "1" {
p2 := readPasswordStdin()
p2 := string(readPasswordStdin())
if p1 != p2 {
fmt.Fprintf(os.Stderr, "%q != %q", p1, p2)
os.Exit(1)
@ -44,7 +44,7 @@ func TestStdin(t *testing.T) {
func TestStdinEof(t *testing.T) {
p1 := "asd45as5f4a36"
if os.Getenv("TEST_SLAVE") == "1" {
p2 := readPasswordStdin()
p2 := string(readPasswordStdin())
if p1 != p2 {
fmt.Fprintf(os.Stderr, "%q != %q", p1, p2)
os.Exit(1)

2
main.go
View File

@ -44,7 +44,7 @@ func loadConfig(args *argContainer) (masterkey []byte, confFile *configfile.Conf
// password).
if args.masterkey != "" {
masterkey = parseMasterKey(args.masterkey)
_, confFile, err = configfile.LoadConfFile(args.config, "")
_, confFile, err = configfile.LoadConfFile(args.config, nil)
} else {
pw := readpassword.Once(args.extpass)
tlog.Info.Println("Decrypting master key")

8
tests/cli/cli_test.go
View File

@ -16,6 +16,8 @@ import (
"github.com/rfjakob/gocryptfs/tests/test_helpers"
)
var testPw = []byte("test")
func TestMain(m *testing.M) {
test_helpers.ResetTmpDir(false)
r := m.Run()
@ -25,7 +27,7 @@ func TestMain(m *testing.M) {
// Test -init flag
func TestInit(t *testing.T) {
dir := test_helpers.InitFS(t)
_, c, err := configfile.LoadConfFile(dir+"/"+configfile.ConfDefaultName, "test")
_, c, err := configfile.LoadConfFile(dir+"/"+configfile.ConfDefaultName, testPw)
if err != nil {
t.Fatal(err)
}
@ -42,7 +44,7 @@ func TestInitDevRandom(t *testing.T) {
// Test -init with -aessiv
func TestInitAessiv(t *testing.T) {
dir := test_helpers.InitFS(t, "-aessiv")
_, c, err := configfile.LoadConfFile(dir+"/"+configfile.ConfDefaultName, "test")
_, c, err := configfile.LoadConfFile(dir+"/"+configfile.ConfDefaultName, testPw)
if err != nil {
t.Fatal(err)
}
@ -54,7 +56,7 @@ func TestInitAessiv(t *testing.T) {
// Test -init with -reverse
func TestInitReverse(t *testing.T) {
dir := test_helpers.InitFS(t, "-reverse")
_, c, err := configfile.LoadConfFile(dir+"/"+configfile.ConfReverseName, "test")
_, c, err := configfile.LoadConfFile(dir+"/"+configfile.ConfReverseName, testPw)
if err != nil {
t.Fatal(err)
}

4
tests/plaintextnames/plaintextnames_test.go
View File

@ -15,6 +15,8 @@ import (
var cDir string
var pDir string
var testPw = []byte("test")
// Create and mount "-plaintextnames" fs
func TestMain(m *testing.M) {
cDir = test_helpers.InitFS(nil, "-plaintextnames")
@ -27,7 +29,7 @@ func TestMain(m *testing.M) {
// Only the PlaintextNames feature flag should be set
func TestFlags(t *testing.T) {
_, cf, err := configfile.LoadConfFile(cDir+"/gocryptfs.conf", "test")
_, cf, err := configfile.LoadConfFile(cDir+"/gocryptfs.conf", testPw)
if err != nil {
t.Fatal(err)
}