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package main
import (
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"runtime/pprof"
"time"
"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"
)
const (
USE_OPENSSL = true
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 initDir(dirArg string) {
dir, _ := filepath.Abs(dirArg)
if dirEmpty(dir) == false {
fmt.Printf("Error: Directory \"%s\" is not empty\n", dirArg)
os.Exit(ERREXIT_INIT)
}
confName := filepath.Join(dir, cryptfs.ConfDefaultName)
fmt.Printf("Choose a password for protecting your files.\n")
password := readPasswordTwice()
err := cryptfs.CreateConfFile(confName, password)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_INIT)
}
fmt.Printf("The filesystem is now ready for mounting.\n")
os.Exit(0)
}
func main() {
runtime.GOMAXPROCS(4)
// Parse command line arguments
var debug, init, zerokey, fusedebug, openssl bool
flag.BoolVar(&debug, "debug", false, "Enable debug output")
flag.BoolVar(&fusedebug, "fusedebug", false, "Enable fuse library debug output")
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")
var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_INIT)
}
fmt.Printf("Writing CPU profile to %s\n", *cpuprofile)
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
if debug {
cryptfs.Debug.Enable()
cryptfs.Debug.Printf("Debug output enabled\n")
}
if openssl == false {
fmt.Printf("Openssl disabled\n")
}
if init {
if flag.NArg() != 1 {
fmt.Printf("usage: %s --init CIPHERDIR\n", PROGRAM_NAME)
os.Exit(ERREXIT_USAGE)
}
initDir(flag.Arg(0))
}
if flag.NArg() < 2 {
fmt.Printf("usage: %s [OPTIONS] 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)
}
key := make([]byte, cryptfs.KEY_LEN)
if zerokey {
fmt.Printf("Zerokey mode active: using all-zero dummy master key.\n")
fmt.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING.\n")
} else {
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("done.\n")
}
srv := pathfsFrontend(key, cipherdir, mountpoint, fusedebug, openssl)
fmt.Printf("Mounted.\n")
if zerokey == false {
printMasterKey(key)
}
// Send notification to our parent
sendSig()
// Jump into server loop
srv.Serve()
}
// 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(`
ATTENTION:
Your master key is: %s
If the gocryptfs.conf 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.
`, 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: %v\n", err)
os.Exit(ERREXIT_PASSWORD)
}
return string(p)
}
func dirEmpty(dir string) bool {
entries, err := ioutil.ReadDir(dir)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_CIPHERDIR)
}
if len(entries) == 0 {
return true
}
return false
}
func pathfsFrontend(key []byte, cipherdir string, mountpoint string, debug bool, openssl bool) *fuse.Server {
finalFs := pathfs_frontend.NewFS(key, cipherdir, openssl)
pathFsOpts := &pathfs.PathNodeFsOptions{ClientInodes: true}
pathFs := pathfs.NewPathNodeFs(finalFs, pathFsOpts)
fuseOpts := &nodefs.Options{
// These options are to be compatible with libfuse defaults,
// making benchmarking easier.
NegativeTimeout: time.Second,
AttrTimeout: time.Second,
EntryTimeout: time.Second,
}
conn := nodefs.NewFileSystemConnector(pathFs.Root(), fuseOpts)
var mOpts fuse.MountOptions
mOpts.AllowOther = false
// Set values shown in "df -T" and friends
// First column, "Filesystem"
mOpts.Options = append(mOpts.Options, "fsname="+cipherdir)
// Second column, "Type", will be shown as "fuse." + Name
mOpts.Name = "gocryptfs"
srv, err := fuse.NewServer(conn.RawFS(), mountpoint, &mOpts)
if err != nil {
fmt.Printf("Mount failed: %v", err)
os.Exit(1)
}
srv.SetDebug(debug)
return srv
}
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