// pathfsFrontend - initialize gocryptfs/pathfs_frontend
// Calls os.Exit on errors
func pathfsFrontend(key []byte, args argContainer, confFile *cryptfs.ConfFile) *fuse.Server {
// Reconciliate CLI and config file arguments into a Args struct that is passed to the
// filesystem implementation
frontendArgs := pathfs_frontend.Args{
Cipherdir: args.cipherdir,
Masterkey: key,
OpenSSL: args.openssl,
PlaintextNames: args.plaintextnames,
DirIV: args.diriv,
EMENames: args.emenames,
GCMIV128: args.gcmiv128,
}
// confFile is nil when "-zerokey" or "-masterkey" was used
if confFile != nil {
// Settings from the config file override command line args
frontendArgs.PlaintextNames = confFile.IsFeatureFlagSet(cryptfs.FlagPlaintextNames)
frontendArgs.DirIV = confFile.IsFeatureFlagSet(cryptfs.FlagDirIV)
frontendArgs.EMENames = confFile.IsFeatureFlagSet(cryptfs.FlagEMENames)
frontendArgs.GCMIV128 = confFile.IsFeatureFlagSet(cryptfs.FlagGCMIV128)
}
// EMENames implies DirIV, both on the command line and in the config file.
if frontendArgs.EMENames {
frontendArgs.DirIV = true
}
// PlainTexnames disables both EMENames and DirIV
if frontendArgs.PlaintextNames {
frontendArgs.DirIV = false
frontendArgs.EMENames = false
}
cryptfs.Debug.Printf("frontendArgs: ")
cryptfs.Debug.JSONDump(frontendArgs)
finalFs := pathfs_frontend.NewFS(frontendArgs)
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="+args.cipherdir)
// Second column, "Type", will be shown as "fuse." + Name
mOpts.Name = "gocryptfs"
srv, err := fuse.NewServer(conn.RawFS(), args.mountpoint, &mOpts)
if err != nil {
fmt.Printf("Mount failed: %v", err)
os.Exit(ERREXIT_MOUNT)
}
srv.SetDebug(args.fusedebug)
// All FUSE file and directory create calls carry explicit permission
// information. We need an unrestricted umask to create the files and
// directories with the requested permissions.
syscall.Umask(0000)
return srv
}
func main() {
runtime.GOMAXPROCS(4)
// Parse command line arguments
var debug, init, zerokey, fusedebug, openssl, passwd, foreground, version bool
var masterkey, mountpoint, cipherdir string
flag.Usage = usageText
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")
flag.BoolVar(&passwd, "passwd", false, "Change password")
flag.BoolVar(&foreground, "f", false, "Stay in the foreground")
flag.BoolVar(&version, "version", false, "Print version and exit")
flag.StringVar(&masterkey, "masterkey", "", "Mount with explicit master key")
var cpuprofile = flag.String("cpuprofile", "", "Write cpu profile to specified file")
flag.Parse()
if version {
fmt.Printf("%s %s; ", PROGRAM_NAME, GitVersion)
fmt.Printf("on-disk format %d\n", cryptfs.HEADER_CURRENT_VERSION)
os.Exit(0)
}
if !foreground {
daemonize() // does not return
}
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)) // does not return
}
if passwd {
if flag.NArg() != 1 {
fmt.Printf("Usage: %s --passwd CIPHERDIR\n", PROGRAM_NAME)
os.Exit(ERREXIT_USAGE)
}
} else {
// Normal mount
if flag.NArg() < 2 {
usageText()
os.Exit(ERREXIT_USAGE)
}
mountpoint, _ = filepath.Abs(flag.Arg(1))
err := checkDirEmpty(mountpoint)
if err != nil {
fmt.Printf("Invalid MOUNTPOINT: %v\n", err)
os.Exit(ERREXIT_MOUNTPOINT)
}
}
cipherdir, _ = filepath.Abs(flag.Arg(0))
err := checkDir(cipherdir)
if err != nil {
fmt.Printf("Invalid CIPHERDIR: %v\n", err)
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")
} else if len(masterkey) > 0 {
key = parseMasterKey(masterkey)
fmt.Printf("Using explicit master key.\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", os.Args[0], flag.Arg(0))
os.Exit(ERREXIT_LOADCONF)
}
if passwd == true {
fmt.Printf("Old password: "******"Password: "******"\nDecrypting master key... ")
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)
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(ERREXIT_PASSWORD)
}
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)
if zerokey == false && len(masterkey) == 0 {
printMasterKey(key)
} else if zerokey == true {
fmt.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING.\n")
} else if len(masterkey) > 0 {
fmt.Printf("THE MASTER KEY IS VISIBLE VIA \"ps -auxwww\", ONLY USE THIS MODE FOR EMERGENCIES.\n")
}
fmt.Println("Filesystem ready.")
// Send notification to our parent
sendUsr1()
// Wait for SIGING in the background and unmount ourselves if we get it
// This prevents a dangling "Transport endpoint is not connected" mountpoint
handleSigint(srv, mountpoint)
// Jump into server loop. Returns when it gets an umount request from the kernel.
srv.Serve()
// main returns with code 0
}