package main import ( "fmt" "io/ioutil" "os" "path/filepath" "strings" "syscall" "github.com/rfjakob/gocryptfs/v2/internal/configfile" "github.com/rfjakob/gocryptfs/v2/internal/cryptocore" "github.com/rfjakob/gocryptfs/v2/internal/exitcodes" "github.com/rfjakob/gocryptfs/v2/internal/fido2" "github.com/rfjakob/gocryptfs/v2/internal/nametransform" "github.com/rfjakob/gocryptfs/v2/internal/readpassword" "github.com/rfjakob/gocryptfs/v2/internal/stupidgcm" "github.com/rfjakob/gocryptfs/v2/internal/syscallcompat" "github.com/rfjakob/gocryptfs/v2/internal/tlog" ) // isEmptyDir checks if "dir" exists and is an empty directory. // Returns an *os.PathError if Stat() on the path fails. func isEmptyDir(dir string) error { err := isDir(dir) if err != nil { return err } entries, err := ioutil.ReadDir(dir) if err != nil { return err } if len(entries) == 0 { return nil } return fmt.Errorf("directory %s not empty", dir) } // isDir checks if "dir" exists and is a directory. func isDir(dir string) error { fi, err := os.Stat(dir) if err != nil { return err } if !fi.IsDir() { return fmt.Errorf("%s is not a directory", dir) } return nil } // initDir handles "gocryptfs -init". It prepares a directory for use as a // gocryptfs storage directory. // In forward mode, this means creating the gocryptfs.conf and gocryptfs.diriv // files in an empty directory. // In reverse mode, we create .gocryptfs.reverse.conf and the directory does // not need to be empty. func initDir(args *argContainer) { var err error if args.reverse { _, err = os.Stat(args.config) if err == nil { tlog.Fatal.Printf("Config file %q already exists", args.config) os.Exit(exitcodes.Init) } } else { err = isEmptyDir(args.cipherdir) if err != nil { tlog.Fatal.Printf("Invalid cipherdir: %v", err) os.Exit(exitcodes.CipherDir) } if !args.xchacha && !stupidgcm.HasAESGCMHardwareSupport() { tlog.Info.Printf(tlog.ColorYellow + "Notice: Your CPU does not have AES-GCM acceleration. Consider using -xchacha for better performance." + tlog.ColorReset) } } // Choose password for config file if len(args.extpass) == 0 && args.fido2 == "" { tlog.Info.Printf("Choose a password for protecting your files.") } { var password []byte var fido2CredentialID, fido2HmacSalt []byte if args.fido2 != "" { fido2CredentialID = fido2.Register(args.fido2, filepath.Base(args.cipherdir)) fido2HmacSalt = cryptocore.RandBytes(32) password = fido2.Secret(args.fido2, args.fido2_assert_options, fido2CredentialID, fido2HmacSalt) } else { // normal password entry password, err = readpassword.Twice([]string(args.extpass), []string(args.passfile)) if err != nil { tlog.Fatal.Println(err) os.Exit(exitcodes.ReadPassword) } fido2CredentialID = nil fido2HmacSalt = nil } creator := tlog.ProgramName + " " + GitVersion err = configfile.Create(&configfile.CreateArgs{ Filename: args.config, Password: password, PlaintextNames: args.plaintextnames, LogN: args.scryptn, Creator: creator, AESSIV: args.aessiv, Fido2CredentialID: fido2CredentialID, Fido2HmacSalt: fido2HmacSalt, Fido2AssertOptions: args.fido2_assert_options, DeterministicNames: args.deterministic_names, XChaCha20Poly1305: args.xchacha, LongNameMax: args.longnamemax, Masterkey: handleArgsMasterkey(args), }) if err != nil { tlog.Fatal.Println(err) os.Exit(exitcodes.WriteConf) } for i := range password { password[i] = 0 } // password runs out of scope here } // Forward mode with filename encryption enabled needs a gocryptfs.diriv file // in the root dir if !args.plaintextnames && !args.reverse && !args.deterministic_names { // Open cipherdir (following symlinks) dirfd, err := syscall.Open(args.cipherdir, syscall.O_DIRECTORY|syscallcompat.O_PATH, 0) if err == nil { err = nametransform.WriteDirIVAt(dirfd) syscall.Close(dirfd) } if err != nil { tlog.Fatal.Println(err) os.Exit(exitcodes.Init) } } mountArgs := "" fsName := "gocryptfs" if args.reverse { mountArgs = " -reverse" fsName = "gocryptfs-reverse" } tlog.Info.Printf(tlog.ColorGreen+"The %s filesystem has been created successfully."+tlog.ColorReset, fsName) wd, _ := os.Getwd() friendlyPath, _ := filepath.Rel(wd, args.cipherdir) if strings.HasPrefix(friendlyPath, "../") { // A relative path that starts with "../" is pretty unfriendly, just // keep the absolute path. friendlyPath = args.cipherdir } if strings.Contains(friendlyPath, " ") { friendlyPath = "\"" + friendlyPath + "\"" } tlog.Info.Printf(tlog.ColorGrey+"You can now mount it using: %s%s %s MOUNTPOINT"+tlog.ColorReset, tlog.ProgramName, mountArgs, friendlyPath) }