308 lines
8.8 KiB
Go
308 lines
8.8 KiB
Go
package main
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import (
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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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"runtime/trace"
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"strconv"
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"strings"
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"time"
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"github.com/hanwen/go-fuse/fuse"
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"github.com/rfjakob/gocryptfs/internal/configfile"
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"github.com/rfjakob/gocryptfs/internal/contentenc"
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"github.com/rfjakob/gocryptfs/internal/exitcodes"
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"github.com/rfjakob/gocryptfs/internal/readpassword"
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"github.com/rfjakob/gocryptfs/internal/speed"
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"github.com/rfjakob/gocryptfs/internal/stupidgcm"
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"github.com/rfjakob/gocryptfs/internal/tlog"
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)
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// GitVersion is the gocryptfs version according to git, set by build.bash
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var GitVersion = "[GitVersion not set - please compile using ./build.bash]"
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// GitVersionFuse is the go-fuse library version, set by build.bash
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var GitVersionFuse = "[GitVersionFuse not set - please compile using ./build.bash]"
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// BuildTime is the Unix timestamp, set by build.bash
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var BuildTime = "0"
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// raceDetector is set to true by race.go if we are compiled with "go build -race"
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var raceDetector bool
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// loadConfig loads the config file "args.config", prompting the user for the password
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func loadConfig(args *argContainer) (masterkey []byte, confFile *configfile.ConfFile, err error) {
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// Check if the file can be opened at all before prompting for a password
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fd, err := os.Open(args.config)
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if err != nil {
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tlog.Fatal.Printf("Cannot open config file: %v", err)
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return nil, nil, exitcodes.NewErr(err.Error(), exitcodes.OpenConf)
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}
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fd.Close()
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// The user has passed the master key (probably because he forgot the
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// password).
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if args.masterkey != "" {
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masterkey = parseMasterKey(args.masterkey)
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_, confFile, err = configfile.LoadConfFile(args.config, "")
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} else {
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pw := readpassword.Once(args.extpass)
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tlog.Info.Println("Decrypting master key")
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masterkey, confFile, err = configfile.LoadConfFile(args.config, pw)
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}
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if err != nil {
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tlog.Fatal.Println(err)
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return nil, nil, err
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}
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return masterkey, confFile, nil
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}
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// changePassword - change the password of config file "filename"
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func changePassword(args *argContainer) {
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masterkey, confFile, err := loadConfig(args)
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if err != nil {
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exitcodes.Exit(err)
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}
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tlog.Info.Println("Please enter your new password.")
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newPw := readpassword.Twice(args.extpass)
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readpassword.CheckTrailingGarbage()
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confFile.EncryptKey(masterkey, newPw, confFile.ScryptObject.LogN())
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if args.masterkey != "" {
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bak := args.config + ".bak"
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err = os.Link(args.config, bak)
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if err != nil {
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tlog.Fatal.Printf("Could not create backup file: %v", err)
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os.Exit(exitcodes.Init)
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}
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tlog.Info.Printf(tlog.ColorGrey+
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"A copy of the old config file has been created at %q.\n"+
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"Delete it after you have verified that you can access your files with the new password."+
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tlog.ColorReset, bak)
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}
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err = confFile.WriteFile()
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if err != nil {
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tlog.Fatal.Println(err)
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os.Exit(exitcodes.WriteConf)
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}
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tlog.Info.Printf(tlog.ColorGreen + "Password changed." + tlog.ColorReset)
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os.Exit(0)
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}
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// printVersion prints a version string like this:
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// gocryptfs v0.12-36-ge021b9d-dirty; go-fuse a4c968c; 2016-07-03 go1.6.2
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func printVersion() {
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humanTime := "0000-00-00"
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if i, _ := strconv.ParseInt(BuildTime, 10, 64); i > 0 {
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t := time.Unix(i, 0).UTC()
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humanTime = fmt.Sprintf("%d-%02d-%02d", t.Year(), t.Month(), t.Day())
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}
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buildFlags := ""
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if stupidgcm.BuiltWithoutOpenssl {
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buildFlags = " without_openssl"
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}
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built := fmt.Sprintf("%s %s", humanTime, runtime.Version())
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if raceDetector {
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built += " -race"
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}
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fmt.Printf("%s %s%s; go-fuse %s; %s\n",
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tlog.ProgramName, GitVersion, buildFlags, GitVersionFuse, built)
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}
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func main() {
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mxp := runtime.GOMAXPROCS(0)
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if mxp < 4 {
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// On a 2-core machine, setting maxprocs to 4 gives 10% better performance
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runtime.GOMAXPROCS(4)
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}
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var err error
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// Parse all command-line options (i.e. arguments starting with "-")
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// into "args". Path arguments are parsed below.
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args := parseCliOpts()
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// Fork a child into the background if "-fg" is not set AND we are mounting
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// a filesystem. The child will do all the work.
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if !args.fg && flagSet.NArg() == 2 {
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ret := forkChild()
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os.Exit(ret)
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}
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if args.debug {
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tlog.Debug.Enabled = true
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}
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// "-v"
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if args.version {
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tlog.Debug.Printf("openssl=%v\n", args.openssl)
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tlog.Debug.Printf("on-disk format %d\n", contentenc.CurrentVersion)
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printVersion()
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os.Exit(0)
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}
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// "-hh"
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if args.hh {
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helpLong()
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os.Exit(0)
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}
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// "-speed"
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if args.speed {
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speed.Run()
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os.Exit(0)
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}
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if args.wpanic {
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tlog.Warn.Wpanic = true
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tlog.Debug.Printf("Panicing on warnings")
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}
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// Every operation below requires CIPHERDIR. Check that we have it.
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if flagSet.NArg() >= 1 {
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args.cipherdir, _ = filepath.Abs(flagSet.Arg(0))
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err = checkDir(args.cipherdir)
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if err != nil {
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tlog.Fatal.Printf("Invalid cipherdir: %v", err)
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os.Exit(exitcodes.CipherDir)
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}
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} else {
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helpShort()
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os.Exit(exitcodes.Usage)
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}
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// "-q"
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if args.quiet {
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tlog.Info.Enabled = false
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}
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// "-reverse" implies "-aessiv"
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if args.reverse {
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args.aessiv = true
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}
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// "-config"
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if args.config != "" {
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args.config, err = filepath.Abs(args.config)
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if err != nil {
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tlog.Fatal.Printf("Invalid \"-config\" setting: %v", err)
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os.Exit(exitcodes.Init)
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}
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tlog.Info.Printf("Using config file at custom location %s", args.config)
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args._configCustom = true
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} else if args.reverse {
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args.config = filepath.Join(args.cipherdir, configfile.ConfReverseName)
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} else {
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args.config = filepath.Join(args.cipherdir, configfile.ConfDefaultName)
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}
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// "-force_owner"
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if args.force_owner != "" {
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var uidNum, gidNum int64
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ownerPieces := strings.SplitN(args.force_owner, ":", 2)
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if len(ownerPieces) != 2 {
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tlog.Fatal.Printf("force_owner must be in form UID:GID")
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os.Exit(exitcodes.Usage)
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}
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uidNum, err = strconv.ParseInt(ownerPieces[0], 0, 32)
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if err != nil || uidNum < 0 {
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tlog.Fatal.Printf("force_owner: Unable to parse UID %v as positive integer", ownerPieces[0])
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os.Exit(exitcodes.Usage)
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}
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gidNum, err = strconv.ParseInt(ownerPieces[1], 0, 32)
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if err != nil || gidNum < 0 {
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tlog.Fatal.Printf("force_owner: Unable to parse GID %v as positive integer", ownerPieces[1])
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os.Exit(exitcodes.Usage)
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}
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args._forceOwner = &fuse.Owner{Uid: uint32(uidNum), Gid: uint32(gidNum)}
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}
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// "-cpuprofile"
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if args.cpuprofile != "" {
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tlog.Info.Printf("Writing CPU profile to %s", args.cpuprofile)
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var f *os.File
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f, err = os.Create(args.cpuprofile)
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if err != nil {
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tlog.Fatal.Println(err)
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os.Exit(exitcodes.Profiler)
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}
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err = pprof.StartCPUProfile(f)
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if err != nil {
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tlog.Fatal.Println(err)
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os.Exit(exitcodes.Profiler)
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}
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defer pprof.StopCPUProfile()
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}
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// "-memprofile"
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if args.memprofile != "" {
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tlog.Info.Printf("Writing mem profile to %s", args.memprofile)
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var f *os.File
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f, err = os.Create(args.memprofile)
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if err != nil {
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tlog.Fatal.Println(err)
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os.Exit(exitcodes.Profiler)
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}
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defer func() {
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pprof.WriteHeapProfile(f)
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f.Close()
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return
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}()
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}
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// "-trace"
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if args.trace != "" {
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tlog.Info.Printf("Writing execution trace to %s", args.trace)
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f, err := os.Create(args.trace)
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if err != nil {
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tlog.Fatal.Println(err)
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os.Exit(exitcodes.Profiler)
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}
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err = trace.Start(f)
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if err != nil {
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tlog.Fatal.Println(err)
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os.Exit(exitcodes.Profiler)
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}
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defer trace.Stop()
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}
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if args.cpuprofile != "" || args.memprofile != "" || args.trace != "" {
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tlog.Info.Printf("Note: You must unmount gracefully, otherwise the profile file(s) will stay empty!\n")
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}
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// "-openssl"
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if !args.openssl {
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tlog.Debug.Printf("OpenSSL disabled, using Go GCM")
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} else {
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tlog.Debug.Printf("OpenSSL enabled")
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}
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// Operation flags
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if args.info && args.init || args.info && args.passwd || args.passwd && args.init {
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tlog.Fatal.Printf("At most one of -info, -init, -passwd is allowed")
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os.Exit(exitcodes.Usage)
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}
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// "-info"
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if args.info {
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if flagSet.NArg() > 1 {
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tlog.Fatal.Printf("Usage: %s -info CIPHERDIR", tlog.ProgramName)
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os.Exit(exitcodes.Usage)
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}
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info(args.config) // does not return
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}
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// "-init"
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if args.init {
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if flagSet.NArg() > 1 {
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tlog.Fatal.Printf("Usage: %s -init [OPTIONS] CIPHERDIR", tlog.ProgramName)
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os.Exit(exitcodes.Usage)
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}
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initDir(&args) // does not return
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}
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// "-passwd"
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if args.passwd {
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if flagSet.NArg() > 1 {
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tlog.Fatal.Printf("Usage: %s -passwd [OPTIONS] CIPHERDIR", tlog.ProgramName)
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os.Exit(exitcodes.Usage)
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}
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changePassword(&args) // does not return
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}
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// Default operation: mount.
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if flagSet.NArg() != 2 {
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prettyArgs := prettyArgs()
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tlog.Info.Printf("Wrong number of arguments (have %d, want 2). You passed: %s",
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flagSet.NArg(), prettyArgs)
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tlog.Fatal.Printf("Usage: %s [OPTIONS] CIPHERDIR MOUNTPOINT [-o COMMA-SEPARATED-OPTIONS]", tlog.ProgramName)
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os.Exit(exitcodes.Usage)
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}
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ret := doMount(&args)
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if ret != 0 {
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os.Exit(ret)
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}
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// Don't call os.Exit on success to give deferred functions a chance to
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// run
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}
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