2cf050d69e
Overwrite the password we have got from the user with zeros once we don't need it anymore, and make sure the variable runs out of scope.
282 lines
8.3 KiB
Go
282 lines
8.3 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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"strconv"
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"strings"
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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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// BuildDate is a date string like "2017-09-06", set by build.bash
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var BuildDate = "0000-00-00"
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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, nil)
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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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for i := range pw {
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pw[i] = 0
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}
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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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{
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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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for i := range newPw {
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newPw[i] = 0
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}
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// newPw runs out of scope here
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}
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// Are we resetting the password without knowing the old one using
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// "-masterkey"?
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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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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", BuildDate, 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("Panicking on warnings")
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}
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// Every operation below requires CIPHERDIR. Exit if we don't have it.
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if flagSet.NArg() == 0 {
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if flagSet.NFlag() == 0 {
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// Naked call to "gocryptfs". Just print the help text.
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helpShort()
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} else {
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// The user has passed some flags, but CIPHERDIR is missing. State
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// what is wrong.
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tlog.Fatal.Printf("CIPHERDIR argument is missing")
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}
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os.Exit(exitcodes.Usage)
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}
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// Check that CIPHERDIR exists
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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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// "-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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onExitFunc := setupCpuprofile(args.cpuprofile)
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defer onExitFunc()
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}
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// "-memprofile"
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if args.memprofile != "" {
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onExitFunc := setupMemprofile(args.memprofile)
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defer onExitFunc()
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}
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// "-trace"
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if args.trace != "" {
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onExitFunc := setupTrace(args.trace)
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defer onExitFunc()
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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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doMount(&args)
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// Don't call os.Exit to give deferred functions a chance to run
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}
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