package main import ( "fmt" "log" "os" "path/filepath" "runtime" "strconv" "strings" "github.com/hanwen/go-fuse/fuse" "github.com/rfjakob/gocryptfs/internal/configfile" "github.com/rfjakob/gocryptfs/internal/contentenc" "github.com/rfjakob/gocryptfs/internal/exitcodes" "github.com/rfjakob/gocryptfs/internal/readpassword" "github.com/rfjakob/gocryptfs/internal/speed" "github.com/rfjakob/gocryptfs/internal/stupidgcm" "github.com/rfjakob/gocryptfs/internal/tlog" ) // GitVersion is the gocryptfs version according to git, set by build.bash var GitVersion = "[GitVersion not set - please compile using ./build.bash]" // GitVersionFuse is the go-fuse library version, set by build.bash var GitVersionFuse = "[GitVersionFuse not set - please compile using ./build.bash]" // BuildDate is a date string like "2017-09-06", set by build.bash var BuildDate = "0000-00-00" // raceDetector is set to true by race.go if we are compiled with "go build -race" var raceDetector bool // loadConfig loads the config file "args.config", prompting the user for the password func loadConfig(args *argContainer) (masterkey []byte, cf *configfile.ConfFile, err error) { // First check if the file can be read at all, and find out if a Trezor should // be used instead of a password. cf, err = configfile.Load(args.config) if err != nil { tlog.Fatal.Printf("Cannot open config file: %v", err) return nil, nil, err } // The user has passed the master key on the command line (probably because // he forgot the password). if args.masterkey != "" { masterkey = parseMasterKey(args.masterkey, false) return masterkey, cf, nil } var pw []byte if cf.IsFeatureFlagSet(configfile.FlagTrezor) { // Get binary data from Trezor pw = readpassword.Trezor(cf.TrezorPayload) } else { // Normal password entry pw = readpassword.Once([]string(args.extpass), args.passfile, "") } tlog.Info.Println("Decrypting master key") masterkey, err = cf.DecryptMasterKey(pw) for i := range pw { pw[i] = 0 } if err != nil { tlog.Fatal.Println(err) return nil, nil, err } return masterkey, cf, nil } // changePassword - change the password of config file "filename" // Does not return (calls os.Exit both on success and on error). func changePassword(args *argContainer) { // Parse the config file, but do not unlock the master key. We only want to // know if the Trezor flag is set. cf1, err := configfile.Load(args.config) if err != nil { tlog.Fatal.Printf("Cannot open config file: %v", err) os.Exit(exitcodes.LoadConf) } if cf1.IsFeatureFlagSet(configfile.FlagTrezor) { tlog.Fatal.Printf("Password change is not supported on Trezor-enabled filesystems.") os.Exit(exitcodes.Usage) } var confFile *configfile.ConfFile { var masterkey []byte masterkey, confFile, err = loadConfig(args) if err != nil { exitcodes.Exit(err) } if len(masterkey) == 0 { log.Panic("empty masterkey") } tlog.Info.Println("Please enter your new password.") newPw := readpassword.Twice([]string(args.extpass), args.passfile) confFile.EncryptKey(masterkey, newPw, confFile.ScryptObject.LogN()) for i := range newPw { newPw[i] = 0 } for i := range masterkey { masterkey[i] = 0 } // masterkey and newPw run out of scope here } // Are we resetting the password without knowing the old one using // "-masterkey"? if args.masterkey != "" { bak := args.config + ".bak" err = os.Link(args.config, bak) if err != nil { tlog.Fatal.Printf("Could not create backup file: %v", err) os.Exit(exitcodes.Init) } tlog.Info.Printf(tlog.ColorGrey+ "A copy of the old config file has been created at %q.\n"+ "Delete it after you have verified that you can access your files with the new password."+ tlog.ColorReset, bak) } err = confFile.WriteFile() if err != nil { tlog.Fatal.Println(err) os.Exit(exitcodes.WriteConf) } tlog.Info.Printf(tlog.ColorGreen + "Password changed." + tlog.ColorReset) } // printVersion prints a version string like this: // gocryptfs v1.7-32-gcf99cfd; go-fuse v1.0.0-174-g22a9cb9; 2019-05-12 go1.12 linux/amd64 func printVersion() { var tagsSlice []string if stupidgcm.BuiltWithoutOpenssl { tagsSlice = append(tagsSlice, "without_openssl") } if readpassword.TrezorSupport { tagsSlice = append(tagsSlice, "enable_trezor") } tags := "" if tagsSlice != nil { tags = " " + strings.Join(tagsSlice, " ") } built := fmt.Sprintf("%s %s", BuildDate, runtime.Version()) if raceDetector { built += " -race" } fmt.Printf("%s %s%s; go-fuse %s; %s %s/%s\n", tlog.ProgramName, GitVersion, tags, GitVersionFuse, built, runtime.GOOS, runtime.GOARCH) } func main() { mxp := runtime.GOMAXPROCS(0) if mxp < 4 { // On a 2-core machine, setting maxprocs to 4 gives 10% better performance runtime.GOMAXPROCS(4) } // mount(1) unsets PATH. Since exec.Command does not handle this case, we set // PATH to a default value if it's empty or unset. if os.Getenv("PATH") == "" { os.Setenv("PATH", "/usr/sbin:/usr/bin:/sbin:/bin") } var err error // Parse all command-line options (i.e. arguments starting with "-") // into "args". Path arguments are parsed below. args := parseCliOpts() // Fork a child into the background if "-fg" is not set AND we are mounting // a filesystem. The child will do all the work. if !args.fg && flagSet.NArg() == 2 { ret := forkChild() os.Exit(ret) } if args.debug { tlog.Debug.Enabled = true } // "-v" if args.version { tlog.Debug.Printf("openssl=%v\n", args.openssl) tlog.Debug.Printf("on-disk format %d\n", contentenc.CurrentVersion) printVersion() os.Exit(0) } // "-hh" if args.hh { helpLong() os.Exit(0) } // "-speed" if args.speed { speed.Run() os.Exit(0) } if args.wpanic { tlog.Warn.Wpanic = true tlog.Debug.Printf("Panicking on warnings") } // Every operation below requires CIPHERDIR. Exit if we don't have it. if flagSet.NArg() == 0 { if flagSet.NFlag() == 0 { // Naked call to "gocryptfs". Just print the help text. helpShort() } else { // The user has passed some flags, but CIPHERDIR is missing. State // what is wrong. tlog.Fatal.Printf("CIPHERDIR argument is missing") } os.Exit(exitcodes.Usage) } // Check that CIPHERDIR exists args.cipherdir, _ = filepath.Abs(flagSet.Arg(0)) err = isDir(args.cipherdir) if err != nil { tlog.Fatal.Printf("Invalid cipherdir: %v", err) os.Exit(exitcodes.CipherDir) } // "-q" if args.quiet { tlog.Info.Enabled = false } // "-reverse" implies "-aessiv" if args.reverse { args.aessiv = true } else { if args.exclude != nil { tlog.Fatal.Printf("-exclude only works in reverse mode") os.Exit(exitcodes.ExcludeError) } } // "-config" if args.config != "" { args.config, err = filepath.Abs(args.config) if err != nil { tlog.Fatal.Printf("Invalid \"-config\" setting: %v", err) os.Exit(exitcodes.Init) } tlog.Info.Printf("Using config file at custom location %s", args.config) args._configCustom = true } else if args.reverse { args.config = filepath.Join(args.cipherdir, configfile.ConfReverseName) } else { args.config = filepath.Join(args.cipherdir, configfile.ConfDefaultName) } // "-force_owner" if args.force_owner != "" { var uidNum, gidNum int64 ownerPieces := strings.SplitN(args.force_owner, ":", 2) if len(ownerPieces) != 2 { tlog.Fatal.Printf("force_owner must be in form UID:GID") os.Exit(exitcodes.Usage) } uidNum, err = strconv.ParseInt(ownerPieces[0], 0, 32) if err != nil || uidNum < 0 { tlog.Fatal.Printf("force_owner: Unable to parse UID %v as positive integer", ownerPieces[0]) os.Exit(exitcodes.Usage) } gidNum, err = strconv.ParseInt(ownerPieces[1], 0, 32) if err != nil || gidNum < 0 { tlog.Fatal.Printf("force_owner: Unable to parse GID %v as positive integer", ownerPieces[1]) os.Exit(exitcodes.Usage) } args._forceOwner = &fuse.Owner{Uid: uint32(uidNum), Gid: uint32(gidNum)} } // "-cpuprofile" if args.cpuprofile != "" { onExitFunc := setupCpuprofile(args.cpuprofile) defer onExitFunc() } // "-memprofile" if args.memprofile != "" { onExitFunc := setupMemprofile(args.memprofile) defer onExitFunc() } // "-trace" if args.trace != "" { onExitFunc := setupTrace(args.trace) defer onExitFunc() } if args.cpuprofile != "" || args.memprofile != "" || args.trace != "" { tlog.Info.Printf("Note: You must unmount gracefully, otherwise the profile file(s) will stay empty!\n") } // "-openssl" if !args.openssl { tlog.Debug.Printf("OpenSSL disabled, using Go GCM") } else { tlog.Debug.Printf("OpenSSL enabled") } // Operation flags nOps := countOpFlags(&args) if nOps == 0 { // Default operation: mount. if flagSet.NArg() != 2 { prettyArgs := prettyArgs() tlog.Info.Printf("Wrong number of arguments (have %d, want 2). You passed: %s", flagSet.NArg(), prettyArgs) tlog.Fatal.Printf("Usage: %s [OPTIONS] CIPHERDIR MOUNTPOINT [-o COMMA-SEPARATED-OPTIONS]", tlog.ProgramName) os.Exit(exitcodes.Usage) } doMount(&args) // Don't call os.Exit to give deferred functions a chance to run return } if nOps > 1 { tlog.Fatal.Printf("At most one of -info, -init, -passwd, -fsck is allowed") os.Exit(exitcodes.Usage) } if flagSet.NArg() != 1 { tlog.Fatal.Printf("The options -info, -init, -passwd, -fsck take exactly one argument, %d given", flagSet.NArg()) os.Exit(exitcodes.Usage) } // "-info" if args.info { info(args.config) os.Exit(0) } // "-init" if args.init { initDir(&args) os.Exit(0) } // "-passwd" if args.passwd { changePassword(&args) os.Exit(0) } // "-fsck" if args.fsck { fsck(&args) os.Exit(0) } }