232 lines
6.2 KiB
Go
232 lines
6.2 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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"runtime/pprof"
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"time"
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"github.com/rfjakob/gocryptfs/cryptfs"
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"github.com/rfjakob/gocryptfs/pathfs_frontend"
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"github.com/hanwen/go-fuse/fuse"
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"github.com/hanwen/go-fuse/fuse/nodefs"
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"github.com/hanwen/go-fuse/fuse/pathfs"
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)
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const (
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USE_OPENSSL = true
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PATHFS_DEBUG = false
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PROGRAM_NAME = "gocryptfs"
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// Exit codes
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ERREXIT_USAGE = 1
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ERREXIT_NEWFS = 2
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ERREXIT_MOUNT = 3
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ERREXIT_SERVE = 4
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ERREXIT_CIPHERDIR = 6
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ERREXIT_INIT = 7
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ERREXIT_LOADCONF = 8
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ERREXIT_PASSWORD = 9
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ERREXIT_MOUNTPOINT = 10
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)
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func initDir(dirArg string) {
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dir, _ := filepath.Abs(dirArg)
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err := checkDirEmpty(dir)
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if err != nil {
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fmt.Printf("Error: \"%s\": %v\n", dirArg, err)
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os.Exit(ERREXIT_INIT)
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}
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confName := filepath.Join(dir, cryptfs.ConfDefaultName)
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fmt.Printf("Choose a password for protecting your files.\n")
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password := readPasswordTwice()
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err = cryptfs.CreateConfFile(confName, password)
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if err != nil {
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fmt.Println(err)
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os.Exit(ERREXIT_INIT)
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}
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fmt.Printf("The filesystem is now ready for mounting.\n")
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os.Exit(0)
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}
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func usageText() {
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fmt.Printf("Usage: %s [OPTIONS] CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
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fmt.Printf("\nOptions:\n")
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flag.PrintDefaults()
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}
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func main() {
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runtime.GOMAXPROCS(4)
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// Parse command line arguments
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var debug, init, zerokey, fusedebug, openssl, passwd, foreground bool
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var masterkey, mountpoint, cipherdir string
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flag.Usage = usageText
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flag.BoolVar(&debug, "debug", false, "Enable debug output")
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flag.BoolVar(&fusedebug, "fusedebug", false, "Enable fuse library debug output")
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flag.BoolVar(&init, "init", false, "Initialize encrypted directory")
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flag.BoolVar(&zerokey, "zerokey", false, "Use all-zero dummy master key")
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flag.BoolVar(&openssl, "openssl", true, "Use OpenSSL instead of built-in Go crypto")
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flag.BoolVar(&passwd, "passwd", false, "Change password")
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flag.BoolVar(&foreground, "f", false, "Stay in the foreground")
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flag.StringVar(&masterkey, "masterkey", "", "Mount with explicit master key")
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var cpuprofile = flag.String("cpuprofile", "", "Write cpu profile to specified file")
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flag.Parse()
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if !foreground {
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daemonize() // does not return
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}
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if *cpuprofile != "" {
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f, err := os.Create(*cpuprofile)
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if err != nil {
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fmt.Println(err)
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os.Exit(ERREXIT_INIT)
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}
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fmt.Printf("Writing CPU profile to %s\n", *cpuprofile)
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pprof.StartCPUProfile(f)
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defer pprof.StopCPUProfile()
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}
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if debug {
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cryptfs.Debug.Enable()
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cryptfs.Debug.Printf("Debug output enabled\n")
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}
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if openssl == false {
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fmt.Printf("Openssl disabled\n")
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}
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if init {
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if flag.NArg() != 1 {
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fmt.Printf("Usage: %s --init CIPHERDIR\n", PROGRAM_NAME)
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os.Exit(ERREXIT_USAGE)
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}
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initDir(flag.Arg(0)) // does not return
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}
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if passwd {
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if flag.NArg() != 1 {
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fmt.Printf("Usage: %s --passwd CIPHERDIR\n", PROGRAM_NAME)
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os.Exit(ERREXIT_USAGE)
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}
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} else {
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// Normal mount
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if flag.NArg() < 2 {
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usageText()
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os.Exit(ERREXIT_USAGE)
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}
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mountpoint, _ = filepath.Abs(flag.Arg(1))
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err := checkDirEmpty(mountpoint)
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if err != nil {
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fmt.Printf("Invalid MOUNTPOINT: %v\n", err)
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os.Exit(ERREXIT_MOUNTPOINT)
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}
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}
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cipherdir, _ = filepath.Abs(flag.Arg(0))
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err := checkDir(cipherdir)
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if err != nil {
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fmt.Printf("Invalid CIPHERDIR: %v\n", err)
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os.Exit(ERREXIT_CIPHERDIR)
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}
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var cf *cryptfs.ConfFile
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var currentPassword string
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key := make([]byte, cryptfs.KEY_LEN)
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if zerokey {
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fmt.Printf("Zerokey mode active: using all-zero dummy master key.\n")
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} else if len(masterkey) > 0 {
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key = parseMasterKey(masterkey)
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fmt.Printf("Using explicit master key.\n")
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} else {
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cfname := filepath.Join(cipherdir, cryptfs.ConfDefaultName)
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_, err = os.Stat(cfname)
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if err != nil {
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fmt.Printf("Error: %s not found in CIPHERDIR\n", cryptfs.ConfDefaultName)
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fmt.Printf("Please run \"%s --init %s\" first\n", os.Args[0], flag.Arg(0))
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os.Exit(ERREXIT_LOADCONF)
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}
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if passwd == true {
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fmt.Printf("Old password: ")
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} else {
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fmt.Printf("Password: ")
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}
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currentPassword = readPassword()
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fmt.Printf("\nDecrypting master key... ")
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cryptfs.Warn.Disable() // Silence DecryptBlock() error messages on incorrect password
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key, cf, err = cryptfs.LoadConfFile(cfname, currentPassword)
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cryptfs.Warn.Enable()
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if err != nil {
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fmt.Println(err)
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os.Exit(ERREXIT_LOADCONF)
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}
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fmt.Printf("done.\n")
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}
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if passwd == true {
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fmt.Printf("Please enter the new password.\n")
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newPassword := readPasswordTwice()
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if newPassword == currentPassword {
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fmt.Printf("New and old passwords are identical\n")
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os.Exit(ERREXIT_PASSWORD)
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}
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cf.EncryptKey(key, newPassword)
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err := cf.WriteFile()
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if err != nil {
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fmt.Println(err)
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os.Exit(ERREXIT_INIT)
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}
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fmt.Printf("Password changed.\n")
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os.Exit(0)
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}
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srv := pathfsFrontend(key, cipherdir, mountpoint, fusedebug, openssl)
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if zerokey == false && len(masterkey) == 0 {
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printMasterKey(key)
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} else if zerokey == true {
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fmt.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING.\n")
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} else if len(masterkey) > 0 {
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fmt.Printf("THE MASTER KEY IS VISIBLE VIA \"ps -auxwww\", ONLY USE THIS MODE FOR EMERGENCIES.\n")
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}
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fmt.Println("Filesystem ready.")
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// Send notification to our parent
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sendUsr1()
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// Jump into server loop
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srv.Serve()
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}
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func pathfsFrontend(key []byte, cipherdir string, mountpoint string, debug bool, openssl bool) *fuse.Server {
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finalFs := pathfs_frontend.NewFS(key, cipherdir, openssl)
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pathFsOpts := &pathfs.PathNodeFsOptions{ClientInodes: true}
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pathFs := pathfs.NewPathNodeFs(finalFs, pathFsOpts)
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fuseOpts := &nodefs.Options{
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// These options are to be compatible with libfuse defaults,
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// making benchmarking easier.
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NegativeTimeout: time.Second,
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AttrTimeout: time.Second,
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EntryTimeout: time.Second,
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}
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conn := nodefs.NewFileSystemConnector(pathFs.Root(), fuseOpts)
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var mOpts fuse.MountOptions
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mOpts.AllowOther = false
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// Set values shown in "df -T" and friends
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// First column, "Filesystem"
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mOpts.Options = append(mOpts.Options, "fsname="+cipherdir)
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// Second column, "Type", will be shown as "fuse." + Name
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mOpts.Name = "gocryptfs"
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srv, err := fuse.NewServer(conn.RawFS(), mountpoint, &mOpts)
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if err != nil {
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fmt.Printf("Mount failed: %v", err)
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os.Exit(ERREXIT_MOUNT)
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}
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srv.SetDebug(debug)
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return srv
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}
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