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-rw-r--r--cryptfs/config_file.go42
-rw-r--r--cryptfs/log.go4
-rw-r--r--gocryptfs_main/main.go68
-rw-r--r--gocryptfs_main/password.go31
4 files changed, 94 insertions, 51 deletions
diff --git a/cryptfs/config_file.go b/cryptfs/config_file.go
index 82f7e72..9be80ca 100644
--- a/cryptfs/config_file.go
+++ b/cryptfs/config_file.go
@@ -7,15 +7,12 @@ import (
import "os"
const (
- // Changing this string breaks backward compatability
- testBlockData = "gocryptfs test block"
-
// The dot "." is not used in base64url (RFC4648), hence
// we can never clash with an encrypted file.
ConfDefaultName = "gocryptfs.conf"
)
-type confFile struct {
+type ConfFile struct {
// File the config is saved to. Not exported to JSON.
filename string
// Encrypted AES key, unlocked using a password hashed with scrypt
@@ -27,19 +24,14 @@ type confFile struct {
// CreateConfFile - create a new config with a random key encrypted with
// "password" and write it to "filename"
func CreateConfFile(filename string, password string) error {
- var cf confFile
+ var cf ConfFile
cf.filename = filename
// Generate new random master key
key := RandBytes(KEY_LEN)
- // Generate derived key from password
- cf.ScryptObject = NewScryptKdf()
- scryptHash := cf.ScryptObject.DeriveKey(password)
-
- // Lock master key using password-based key
- cfs := NewCryptFS(scryptHash, false)
- cf.EncryptedKey = cfs.EncryptBlock(key, 0)
+ // Encrypt it using the password
+ cf.EncryptKey(key, password)
// Write file to disk
err := cf.WriteFile()
@@ -49,21 +41,21 @@ func CreateConfFile(filename string, password string) error {
// LoadConfFile - read config file from disk and decrypt the
// contained key using password
-func LoadConfFile(filename string, password string) ([]byte, error) {
- var cf confFile
+func LoadConfFile(filename string, password string) ([]byte, *ConfFile, error) {
+ var cf ConfFile
cf.filename = filename
// Read from disk
js, err := ioutil.ReadFile(filename)
if err != nil {
- return nil, err
+ return nil, nil, err
}
// Unmarshal
err = json.Unmarshal(js, &cf)
if err != nil {
Warn.Printf("Failed to unmarshal config file\n")
- return nil, err
+ return nil, nil, err
}
// Generate derived key from password
@@ -76,15 +68,27 @@ func LoadConfFile(filename string, password string) ([]byte, error) {
key, err := cfs.DecryptBlock(cf.EncryptedKey, 0)
if err != nil {
Warn.Printf("Failed to unlock master key: %s\n", err.Error())
- return nil, err
+ return nil, nil, err
}
- return key, nil
+ return key, &cf, nil
+}
+
+// EncryptKey - encrypt "key" using an scrypt hash generated from "password"
+// and store it in cf.EncryptedKey
+func (cf *ConfFile) EncryptKey(key []byte, password string) {
+ // Generate derived key from password
+ cf.ScryptObject = NewScryptKdf()
+ scryptHash := cf.ScryptObject.DeriveKey(password)
+
+ // Lock master key using password-based key
+ cfs := NewCryptFS(scryptHash, false)
+ cf.EncryptedKey = cfs.EncryptBlock(key, 0)
}
// WriteFile - write out config in JSON format to file "filename.tmp"
// then rename over "filename"
-func (cf *confFile) WriteFile() error {
+func (cf *ConfFile) WriteFile() error {
tmp := cf.filename + ".tmp"
fd, err := os.Create(tmp)
if err != nil {
diff --git a/cryptfs/log.go b/cryptfs/log.go
index 0884473..2183679 100644
--- a/cryptfs/log.go
+++ b/cryptfs/log.go
@@ -30,6 +30,10 @@ func (l *logChannel) Enable() {
l.enabled = true
}
+func (l *logChannel) Disable() {
+ l.enabled = false
+}
+
// Only actually calculate the md5sum if the log channel is enabled to save
// CPU cycles
func (l *logChannel) Md5sum(buf []byte) string {
diff --git a/gocryptfs_main/main.go b/gocryptfs_main/main.go
index ac0b456..35c5723 100644
--- a/gocryptfs_main/main.go
+++ b/gocryptfs_main/main.go
@@ -13,8 +13,6 @@ import (
"github.com/rfjakob/gocryptfs/cryptfs"
"github.com/rfjakob/gocryptfs/pathfs_frontend"
- "golang.org/x/crypto/ssh/terminal"
-
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/hanwen/go-fuse/fuse/pathfs"
@@ -62,7 +60,7 @@ func main() {
runtime.GOMAXPROCS(4)
// Parse command line arguments
- var debug, init, zerokey, fusedebug, openssl bool
+ var debug, init, zerokey, fusedebug, openssl, passwd bool
var masterkey string
flag.BoolVar(&debug, "debug", false, "Enable debug output")
@@ -70,6 +68,7 @@ func main() {
flag.BoolVar(&init, "init", false, "Initialize encrypted directory")
flag.BoolVar(&zerokey, "zerokey", false, "Use all-zero dummy master key")
flag.BoolVar(&openssl, "openssl", true, "Use OpenSSL instead of built-in Go crypto")
+ flag.BoolVar(&passwd, "passwd", false, "Change password")
flag.StringVar(&masterkey, "masterkey", "", "Mount with explicit master key")
var cpuprofile = flag.String("cpuprofile", "", "Write cpu profile to specified file")
@@ -97,8 +96,12 @@ func main() {
os.Exit(ERREXIT_USAGE)
}
initDir(flag.Arg(0))
- }
- if flag.NArg() < 2 {
+ } else if passwd {
+ if flag.NArg() != 1 {
+ fmt.Printf("usage: %s --passwd CIPHERDIR\n", PROGRAM_NAME)
+ os.Exit(ERREXIT_USAGE)
+ }
+ } else if flag.NArg() < 2 {
fmt.Printf("usage: %s [OPTIONS] CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
os.Exit(ERREXIT_USAGE)
}
@@ -112,6 +115,8 @@ func main() {
os.Exit(ERREXIT_CIPHERDIR)
}
+ var cf *cryptfs.ConfFile
+ var currentPassword string
key := make([]byte, cryptfs.KEY_LEN)
if zerokey {
fmt.Printf("Zerokey mode active: using all-zero dummy master key.\n")
@@ -126,16 +131,39 @@ func main() {
fmt.Printf("Please run \"%s --init %s\" first\n", PROGRAM_NAME, flag.Arg(0))
os.Exit(ERREXIT_LOADCONF)
}
- fmt.Printf("Password: ")
- password := readPassword()
+ if passwd == true {
+ fmt.Printf("Old password: ")
+ } else {
+ fmt.Printf("Password: ")
+ }
+ currentPassword = readPassword()
fmt.Printf("\nDecrypting master key... ")
- key, err = cryptfs.LoadConfFile(cfname, password)
+ cryptfs.Warn.Disable() // Silence DecryptBlock() error messages on incorrect password
+ key, cf, err = cryptfs.LoadConfFile(cfname, currentPassword)
+ cryptfs.Warn.Enable()
if err != nil {
fmt.Println(err)
+ fmt.Println("Password incorrect.")
os.Exit(ERREXIT_LOADCONF)
}
fmt.Printf("done.\n")
}
+ if passwd == true {
+ fmt.Printf("Please enter the new password.\n")
+ newPassword := readPasswordTwice()
+ if newPassword == currentPassword {
+ fmt.Printf("New and old passwords are identical\n")
+ os.Exit(1)
+ }
+ cf.EncryptKey(key, newPassword)
+ err := cf.WriteFile()
+ if err != nil {
+ fmt.Println(err)
+ os.Exit(ERREXIT_INIT)
+ }
+ fmt.Printf("Password changed.\n")
+ os.Exit(0)
+ }
srv := pathfsFrontend(key, cipherdir, mountpoint, fusedebug, openssl)
fmt.Printf("Mounted.\n")
@@ -154,30 +182,6 @@ func main() {
srv.Serve()
}
-func readPasswordTwice() string {
- fmt.Printf("Password: ")
- p1 := readPassword()
- fmt.Printf("\nRepeat: ")
- p2 := readPassword()
- fmt.Printf("\n")
- if p1 != p2 {
- fmt.Printf("Passwords do not match\n")
- os.Exit(ERREXIT_PASSWORD)
- }
- return p1
-}
-
-// Get password from terminal
-func readPassword() string {
- fd := int(os.Stdin.Fd())
- p, err := terminal.ReadPassword(fd)
- if err != nil {
- fmt.Printf("Error: Could not read password: %v\n", err)
- os.Exit(ERREXIT_PASSWORD)
- }
- return string(p)
-}
-
func dirEmpty(dir string) bool {
entries, err := ioutil.ReadDir(dir)
if err != nil {
diff --git a/gocryptfs_main/password.go b/gocryptfs_main/password.go
new file mode 100644
index 0000000..821ecb4
--- /dev/null
+++ b/gocryptfs_main/password.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+ "fmt"
+ "golang.org/x/crypto/ssh/terminal"
+ "os"
+)
+
+func readPasswordTwice() string {
+ fmt.Printf("Password: ")
+ p1 := readPassword()
+ fmt.Printf("\nRepeat: ")
+ p2 := readPassword()
+ fmt.Printf("\n")
+ if p1 != p2 {
+ fmt.Printf("Passwords do not match\n")
+ os.Exit(ERREXIT_PASSWORD)
+ }
+ return p1
+}
+
+// Get password from terminal
+func readPassword() string {
+ fd := int(os.Stdin.Fd())
+ p, err := terminal.ReadPassword(fd)
+ if err != nil {
+ fmt.Printf("Error: Could not read password: %v\n", err)
+ os.Exit(ERREXIT_PASSWORD)
+ }
+ return string(p)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-03 22:26:41 +0000