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package main
import (
"flag"
"fmt"
"os"
"path/filepath"
"time"
"encoding/hex"
"github.com/rfjakob/gocryptfs/cluefs_frontend"
"github.com/rfjakob/gocryptfs/pathfs_frontend"
"github.com/rfjakob/gocryptfs/cryptfs"
"golang.org/x/crypto/ssh/terminal"
bazilfuse "bazil.org/fuse"
bazilfusefs "bazil.org/fuse/fs"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/hanwen/go-fuse/fuse/pathfs"
)
const (
USE_CLUEFS = false // Use cluefs or pathfs FUSE frontend
USE_OPENSSL = true // 3x speed increase
PATHFS_DEBUG = false
PROGRAM_NAME = "gocryptfs"
// Exit codes
ERREXIT_USAGE = 1
ERREXIT_NEWFS = 2
ERREXIT_MOUNT = 3
ERREXIT_SERVE = 4
ERREXIT_MOUNT2 = 5
ERREXIT_CIPHERDIR = 6
ERREXIT_INIT = 7
ERREXIT_LOADCONF = 8
ERREXIT_PASSWORD = 9
)
func main() {
// Parse command line arguments
var debug bool
var init bool
flag.BoolVar(&debug, "debug", false, "Enable debug output")
flag.BoolVar(&init, "init", false, "Initialize encrypted directory")
flag.Parse()
if debug {
cryptfs.Debug.Enable()
cryptfs.Debug.Printf("Debug output enabled\n")
}
if init {
if flag.NArg() != 1 {
fmt.Printf("usage: %s --init CIPHERDIR\n", PROGRAM_NAME)
os.Exit(ERREXIT_USAGE)
}
dir, _ := filepath.Abs(flag.Arg(0))
filename := filepath.Join(dir, cryptfs.ConfDefaultName)
fmt.Printf("Choose a password for protecting your files.\n")
password := readPasswordTwice()
err := cryptfs.CreateConfFile(filename, password)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_INIT)
}
fmt.Printf("The filesystem is now ready for mounting.\n")
os.Exit(0)
}
if flag.NArg() < 2 {
fmt.Printf("usage: %s CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
os.Exit(ERREXIT_USAGE)
}
cipherdir, _ := filepath.Abs(flag.Arg(0))
mountpoint, _ := filepath.Abs(flag.Arg(1))
cryptfs.Debug.Printf("cipherdir=%s\nmountpoint=%s\n", cipherdir, mountpoint)
_, err := os.Stat(cipherdir)
if err != nil {
fmt.Printf("Cipherdir: %s\n", err.Error())
os.Exit(ERREXIT_CIPHERDIR)
}
cfname := filepath.Join(cipherdir, cryptfs.ConfDefaultName)
_, err = os.Stat(cfname)
if err != nil {
fmt.Printf("Error: %s not found in CIPHERDIR\n", cryptfs.ConfDefaultName)
fmt.Printf("Please run \"%s --init %s\" first\n", PROGRAM_NAME, flag.Arg(0))
os.Exit(ERREXIT_LOADCONF)
}
fmt.Printf("Password: ")
password := readPassword()
fmt.Printf("\nDecrypting master key... ")
key, err := cryptfs.LoadConfFile(cfname, password)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_LOADCONF)
}
fmt.Printf("Success\n")
printMasterKey(key)
if USE_CLUEFS {
cluefsFrontend(key, cipherdir, mountpoint)
} else {
pathfsFrontend(key, cipherdir, mountpoint, debug)
}
}
// printMasterKey - remind the user that he should store the master key in
// a safe place
func printMasterKey(key []byte) {
h := hex.EncodeToString(key)
// Make it less scary by splitting it up in chunks
h = h[0:8] + "-" + h[8:16] + "-" + h[16:24] + "-" + h[24:32]
fmt.Printf(`
WARNING:
If the gocryptfs config file becomes corrupted or you ever
forget your password, there is only one hope for recovery:
The master key. Print it to a piece of paper and store it in a drawer.
Master key: %s
`, h)
}
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: %s\n")
os.Exit(ERREXIT_PASSWORD)
}
return string(p)
}
func cluefsFrontend(key []byte, cipherdir string, mountpoint string) {
cfs, err := cluefs_frontend.NewFS(key, cipherdir, USE_OPENSSL)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_NEWFS)
}
// Mount the file system
mountOpts := []bazilfuse.MountOption{
bazilfuse.FSName(PROGRAM_NAME),
bazilfuse.Subtype(PROGRAM_NAME),
bazilfuse.VolumeName(PROGRAM_NAME),
bazilfuse.LocalVolume(),
bazilfuse.MaxReadahead(1024 * 1024),
}
conn, err := bazilfuse.Mount(mountpoint, mountOpts...)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_MOUNT)
}
defer conn.Close()
// Start serving requests
if err = bazilfusefs.Serve(conn, cfs); err != nil {
fmt.Println(err)
os.Exit(ERREXIT_SERVE)
}
// Check for errors when mounting the file system
<-conn.Ready
if err = conn.MountError; err != nil {
fmt.Println(err)
os.Exit(ERREXIT_MOUNT2)
}
// We are done
os.Exit(0)
}
func pathfsFrontend(key []byte, cipherdir string, mountpoint string, debug bool){
finalFs := pathfs_frontend.NewFS(key, cipherdir, USE_OPENSSL)
opts := &nodefs.Options{
// These options are to be compatible with libfuse defaults,
// making benchmarking easier.
NegativeTimeout: time.Second,
AttrTimeout: time.Second,
EntryTimeout: time.Second,
}
pathFs := pathfs.NewPathNodeFs(finalFs, nil)
conn := nodefs.NewFileSystemConnector(pathFs.Root(), opts)
mOpts := &fuse.MountOptions{
AllowOther: false,
}
state, err := fuse.NewServer(conn.RawFS(), mountpoint, mOpts)
if err != nil {
fmt.Printf("Mount fail: %v\n", err)
os.Exit(1)
}
state.SetDebug(debug)
fmt.Println("Mounted.")
state.Serve()
}
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