Re-design of the original gocryptfs code to work as a library.
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libgocryptfs/main.go

269 lines
7.3 KiB

package main
import (
"fmt"
"os"
"path/filepath"
"runtime"
"runtime/pprof"
"strconv"
"time"
"github.com/rfjakob/gocryptfs/internal/configfile"
"github.com/rfjakob/gocryptfs/internal/contentenc"
"github.com/rfjakob/gocryptfs/internal/readpassword"
"github.com/rfjakob/gocryptfs/internal/speed"
"github.com/rfjakob/gocryptfs/internal/stupidgcm"
"github.com/rfjakob/gocryptfs/internal/tlog"
)
// Exit codes
const (
ErrExitUsage = 1
ErrExitMount = 3
ErrExitCipherDir = 6
ErrExitInit = 7
ErrExitLoadConf = 8
ErrExitMountPoint = 10
)
const pleaseBuildBash = "[not set - please compile using ./build.bash]"
// GitVersion is the gocryptfs version according to git, set by build.bash
var GitVersion = pleaseBuildBash
// GitVersionFuse is the go-fuse library version, set by build.bash
var GitVersionFuse = pleaseBuildBash
// BuildTime is the Unix timestamp, set by build.bash
var BuildTime = "0"
// raceDetector is set to true by race.go if we are compiled with "go build -race"
var raceDetector bool
func usageText() {
printVersion()
fmt.Printf(`
Usage: %s -init|-passwd [OPTIONS] CIPHERDIR
or %s [OPTIONS] CIPHERDIR MOUNTPOINT [-o COMMA-SEPARATED-OPTIONS]
Options:
`, tlog.ProgramName, tlog.ProgramName)
flagSet.PrintDefaults()
fmt.Print(` --
Stop option parsing
`)
}
// loadConfig loads the config file "args.config", prompting the user for the password
func loadConfig(args *argContainer) (masterkey []byte, confFile *configfile.ConfFile, err error) {
// Check if the file can be opened at all before prompting for a password
fd, err := os.Open(args.config)
if err != nil {
tlog.Fatal.Printf("Cannot open config file: %v", err)
return nil, nil, err
}
fd.Close()
// The user has passed the master key (probably because he forgot the
// password).
if args.masterkey != "" {
masterkey = parseMasterKey(args.masterkey)
_, confFile, err = configfile.LoadConfFile(args.config, "")
} else {
pw := readpassword.Once(args.extpass)
tlog.Info.Println("Decrypting master key")
masterkey, confFile, err = configfile.LoadConfFile(args.config, pw)
}
if err != nil {
tlog.Fatal.Println(err)
return nil, nil, err
}
return masterkey, confFile, nil
}
// changePassword - change the password of config file "filename"
func changePassword(args *argContainer) {
masterkey, confFile, err := loadConfig(args)
if err != nil {
os.Exit(ErrExitLoadConf)
}
tlog.Info.Println("Please enter your new password.")
newPw := readpassword.Twice(args.extpass)
readpassword.CheckTrailingGarbage()
confFile.EncryptKey(masterkey, newPw, confFile.ScryptObject.LogN())
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(ErrExitInit)
}
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(ErrExitInit)
}
tlog.Info.Printf(tlog.ColorGreen + "Password changed." + tlog.ColorReset)
os.Exit(0)
}
// printVersion prints a version string like this:
// gocryptfs v0.12-36-ge021b9d-dirty; go-fuse a4c968c; 2016-07-03 go1.6.2
func printVersion() {
humanTime := "0000-00-00"
if i, _ := strconv.ParseInt(BuildTime, 10, 64); i > 0 {
t := time.Unix(i, 0).UTC()
humanTime = fmt.Sprintf("%d-%02d-%02d", t.Year(), t.Month(), t.Day())
}
buildFlags := ""
if stupidgcm.BuiltWithoutOpenssl {
buildFlags = " without_openssl"
}
built := fmt.Sprintf("%s %s", humanTime, runtime.Version())
if raceDetector {
built += " -race"
}
fmt.Printf("%s %s%s; go-fuse %s; %s\n",
tlog.ProgramName, GitVersion, buildFlags, GitVersionFuse, built)
}
func main() {
runtime.GOMAXPROCS(4)
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)
}
// "-speed"
if args.speed {
speed.Run()
os.Exit(0)
}
if args.wpanic {
tlog.Warn.Wpanic = true
tlog.Debug.Printf("Panicing on warnings")
}
// Every operation below requires CIPHERDIR. Check that we have it.
if flagSet.NArg() >= 1 {
args.cipherdir, _ = filepath.Abs(flagSet.Arg(0))
err = checkDir(args.cipherdir)
if err != nil {
tlog.Fatal.Printf("Invalid cipherdir: %v", err)
os.Exit(ErrExitCipherDir)
}
} else {
usageText()
os.Exit(ErrExitUsage)
}
// "-q"
if args.quiet {
tlog.Info.Enabled = false
}
// "-reverse" implies "-aessiv"
if args.reverse {
args.aessiv = true
}
// "-config"
if args.config != "" {
args.config, err = filepath.Abs(args.config)
if err != nil {
tlog.Fatal.Printf("Invalid \"-config\" setting: %v", err)
os.Exit(ErrExitInit)
}
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)
}
// "-cpuprofile"
if args.cpuprofile != "" {
tlog.Info.Printf("Writing CPU profile to %s", args.cpuprofile)
var f *os.File
f, err = os.Create(args.cpuprofile)
if err != nil {
tlog.Fatal.Println(err)
os.Exit(ErrExitInit)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
// "-memprofile"
if args.memprofile != "" {
tlog.Info.Printf("Writing mem profile to %s", args.memprofile)
var f *os.File
f, err = os.Create(args.memprofile)
if err != nil {
tlog.Fatal.Println(err)
os.Exit(ErrExitInit)
}
defer func() {
pprof.WriteHeapProfile(f)
f.Close()
return
}()
}
if args.cpuprofile != "" || args.memprofile != "" {
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: -init or -passwd; otherwise: mount
// "-init"
if args.init {
if flagSet.NArg() > 1 {
tlog.Fatal.Printf("Usage: %s -init [OPTIONS] CIPHERDIR", tlog.ProgramName)
os.Exit(ErrExitUsage)
}
initDir(&args) // does not return
}
// "-passwd"
if args.passwd {
if flagSet.NArg() > 1 {
tlog.Fatal.Printf("Usage: %s -passwd [OPTIONS] CIPHERDIR", tlog.ProgramName)
os.Exit(ErrExitUsage)
}
changePassword(&args) // does not return
}
// 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(ErrExitUsage)
}
ret := doMount(&args)
if ret != 0 {
os.Exit(ret)
}
// Don't call os.Exit on success to give deferred functions a chance to
// run
}