aboutsummaryrefslogtreecommitdiff
path: root/main.go
diff options
context:
space:
mode:
Diffstat (limited to 'main.go')
-rw-r--r--main.go233
1 files changed, 233 insertions, 0 deletions
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..912ff72
--- /dev/null
+++ b/main.go
@@ -0,0 +1,233 @@
+package main
+
+import (
+ "flag"
+ "fmt"
+ "io/ioutil"
+ "os"
+ "path/filepath"
+ "runtime"
+ "runtime/pprof"
+ "time"
+
+ "github.com/rfjakob/gocryptfs/cryptfs"
+ "github.com/rfjakob/gocryptfs/pathfs_frontend"
+
+ "github.com/hanwen/go-fuse/fuse"
+ "github.com/hanwen/go-fuse/fuse/nodefs"
+ "github.com/hanwen/go-fuse/fuse/pathfs"
+)
+
+const (
+ USE_OPENSSL = true
+ PATHFS_DEBUG = false
+
+ PROGRAM_NAME = "gocryptfs"
+
+ // Exit codes
+ ERREXIT_USAGE = 1
+ ERREXIT_NEWFS = 2
+ ERREXIT_MOUNT = 3
+ ERREXIT_SERVE = 4
+ ERREXIT_MOUNT2 = 5
+ ERREXIT_CIPHERDIR = 6
+ ERREXIT_INIT = 7
+ ERREXIT_LOADCONF = 8
+ ERREXIT_PASSWORD = 9
+)
+
+func initDir(dirArg string) {
+ dir, _ := filepath.Abs(dirArg)
+
+ if dirEmpty(dir) == false {
+ fmt.Printf("Error: Directory \"%s\" is not empty\n", dirArg)
+ os.Exit(ERREXIT_INIT)
+ }
+
+ confName := filepath.Join(dir, cryptfs.ConfDefaultName)
+ fmt.Printf("Choose a password for protecting your files.\n")
+ password := readPasswordTwice()
+ err := cryptfs.CreateConfFile(confName, password)
+ if err != nil {
+ fmt.Println(err)
+ os.Exit(ERREXIT_INIT)
+ }
+ fmt.Printf("The filesystem is now ready for mounting.\n")
+ os.Exit(0)
+}
+
+func usageText() {
+ fmt.Printf("Usage: %s [OPTIONS] CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
+ fmt.Printf("\nOptions:\n")
+ flag.PrintDefaults()
+}
+
+func main() {
+ runtime.GOMAXPROCS(4)
+
+ // Parse command line arguments
+ var debug, init, zerokey, fusedebug, openssl, passwd bool
+ var masterkey string
+
+ flag.Usage = usageText
+ flag.BoolVar(&debug, "debug", false, "Enable debug output")
+ flag.BoolVar(&fusedebug, "fusedebug", false, "Enable fuse library debug output")
+ flag.BoolVar(&init, "init", false, "Initialize encrypted directory")
+ flag.BoolVar(&zerokey, "zerokey", false, "Use all-zero dummy master key")
+ flag.BoolVar(&openssl, "openssl", true, "Use OpenSSL instead of built-in Go crypto")
+ flag.BoolVar(&passwd, "passwd", false, "Change password")
+ flag.StringVar(&masterkey, "masterkey", "", "Mount with explicit master key")
+ var cpuprofile = flag.String("cpuprofile", "", "Write cpu profile to specified file")
+
+ flag.Parse()
+ if *cpuprofile != "" {
+ f, err := os.Create(*cpuprofile)
+ if err != nil {
+ fmt.Println(err)
+ os.Exit(ERREXIT_INIT)
+ }
+ fmt.Printf("Writing CPU profile to %s\n", *cpuprofile)
+ pprof.StartCPUProfile(f)
+ defer pprof.StopCPUProfile()
+ }
+ if debug {
+ cryptfs.Debug.Enable()
+ cryptfs.Debug.Printf("Debug output enabled\n")
+ }
+ if openssl == false {
+ fmt.Printf("Openssl disabled\n")
+ }
+ if init {
+ if flag.NArg() != 1 {
+ fmt.Printf("Usage: %s --init CIPHERDIR\n", PROGRAM_NAME)
+ os.Exit(ERREXIT_USAGE)
+ }
+ initDir(flag.Arg(0))
+ } else if passwd {
+ if flag.NArg() != 1 {
+ fmt.Printf("Usage: %s --passwd CIPHERDIR\n", PROGRAM_NAME)
+ os.Exit(ERREXIT_USAGE)
+ }
+ } else if flag.NArg() < 2 {
+ usageText()
+ os.Exit(ERREXIT_USAGE)
+ }
+ cipherdir, _ := filepath.Abs(flag.Arg(0))
+ mountpoint, _ := filepath.Abs(flag.Arg(1))
+ cryptfs.Debug.Printf("cipherdir=%s\nmountpoint=%s\n", cipherdir, mountpoint)
+
+ _, err := os.Stat(cipherdir)
+ if err != nil {
+ fmt.Printf("Cipherdir: %s\n", err.Error())
+ os.Exit(ERREXIT_CIPHERDIR)
+ }
+
+ var cf *cryptfs.ConfFile
+ var currentPassword string
+ key := make([]byte, cryptfs.KEY_LEN)
+ if zerokey {
+ fmt.Printf("Zerokey mode active: using all-zero dummy master key.\n")
+ } else if len(masterkey) > 0 {
+ key = parseMasterKey(masterkey)
+ fmt.Printf("Using explicit master key.\n")
+ } else {
+ cfname := filepath.Join(cipherdir, cryptfs.ConfDefaultName)
+ _, err = os.Stat(cfname)
+ if err != nil {
+ fmt.Printf("Error: %s not found in CIPHERDIR\n", cryptfs.ConfDefaultName)
+ fmt.Printf("Please run \"%s --init %s\" first\n", PROGRAM_NAME, flag.Arg(0))
+ os.Exit(ERREXIT_LOADCONF)
+ }
+ if passwd == true {
+ fmt.Printf("Old password: ")
+ } else {
+ fmt.Printf("Password: ")
+ }
+ currentPassword = readPassword()
+ fmt.Printf("\nDecrypting master key... ")
+ cryptfs.Warn.Disable() // Silence DecryptBlock() error messages on incorrect password
+ key, cf, err = cryptfs.LoadConfFile(cfname, currentPassword)
+ cryptfs.Warn.Enable()
+ if err != nil {
+ fmt.Println(err)
+ fmt.Println("Password incorrect.")
+ os.Exit(ERREXIT_LOADCONF)
+ }
+ fmt.Printf("done.\n")
+ }
+ if passwd == true {
+ fmt.Printf("Please enter the new password.\n")
+ newPassword := readPasswordTwice()
+ if newPassword == currentPassword {
+ fmt.Printf("New and old passwords are identical\n")
+ os.Exit(1)
+ }
+ cf.EncryptKey(key, newPassword)
+ err := cf.WriteFile()
+ if err != nil {
+ fmt.Println(err)
+ os.Exit(ERREXIT_INIT)
+ }
+ fmt.Printf("Password changed.\n")
+ os.Exit(0)
+ }
+
+ srv := pathfsFrontend(key, cipherdir, mountpoint, fusedebug, openssl)
+
+ if zerokey == false && len(masterkey) == 0 {
+ printMasterKey(key)
+ } else if zerokey == true {
+ fmt.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING.\n")
+ } else if len(masterkey) > 0 {
+ fmt.Printf("THE MASTER KEY IS VISIBLE VIA \"ps -auxwww\", ONLY USE THIS MODE FOR EMERGENCIES.\n")
+ }
+
+ fmt.Println("Filesystem ready.")
+ // Send notification to our parent
+ sendSig()
+ // Jump into server loop
+ srv.Serve()
+}
+
+func dirEmpty(dir string) bool {
+ entries, err := ioutil.ReadDir(dir)
+ if err != nil {
+ fmt.Println(err)
+ os.Exit(ERREXIT_CIPHERDIR)
+ }
+ if len(entries) == 0 {
+ return true
+ }
+ return false
+}
+
+func pathfsFrontend(key []byte, cipherdir string, mountpoint string, debug bool, openssl bool) *fuse.Server {
+
+ finalFs := pathfs_frontend.NewFS(key, cipherdir, openssl)
+ pathFsOpts := &pathfs.PathNodeFsOptions{ClientInodes: true}
+ pathFs := pathfs.NewPathNodeFs(finalFs, pathFsOpts)
+ fuseOpts := &nodefs.Options{
+ // These options are to be compatible with libfuse defaults,
+ // making benchmarking easier.
+ NegativeTimeout: time.Second,
+ AttrTimeout: time.Second,
+ EntryTimeout: time.Second,
+ }
+ conn := nodefs.NewFileSystemConnector(pathFs.Root(), fuseOpts)
+ var mOpts fuse.MountOptions
+ mOpts.AllowOther = false
+ // Set values shown in "df -T" and friends
+ // First column, "Filesystem"
+ mOpts.Options = append(mOpts.Options, "fsname="+cipherdir)
+ // Second column, "Type", will be shown as "fuse." + Name
+ mOpts.Name = "gocryptfs"
+
+ srv, err := fuse.NewServer(conn.RawFS(), mountpoint, &mOpts)
+ if err != nil {
+ fmt.Printf("Mount failed: %v", err)
+ os.Exit(1)
+ }
+ srv.SetDebug(debug)
+
+ return srv
+}