Move main binary to gocryptfs_main

That way the wrapper shell script can be named just "gocryptfs"

1 files changed, 222 insertions, 0 deletions

diff --git a/gocryptfs_main/main.go b/gocryptfs_main/main.go
new file mode 100644
index 0000000..ae3974e
--- /dev/null
+++ b/gocryptfs_main/main.go
@@ -0,0 +1,222 @@
+package main
+
+import (
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"runtime"
+	"runtime/pprof"
+	"time"
+
+	"github.com/rfjakob/gocryptfs/cryptfs"
+	"github.com/rfjakob/gocryptfs/pathfs_frontend"
+
+	"golang.org/x/crypto/ssh/terminal"
+
+	"github.com/hanwen/go-fuse/fuse"
+	"github.com/hanwen/go-fuse/fuse/nodefs"
+	"github.com/hanwen/go-fuse/fuse/pathfs"
+)
+
+const (
+	USE_CLUEFS   = false // Use cluefs or pathfs FUSE frontend
+	USE_OPENSSL  = true  // 3x speed increase compared to Go's built-in GCM
+	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 main() {
+	runtime.GOMAXPROCS(4)
+
+	// Parse command line arguments
+	var debug, init, zerokey, fusedebug bool
+
+	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")
+	var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to 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 init {
+		if flag.NArg() != 1 {
+			fmt.Printf("usage: %s --init CIPHERDIR\n", PROGRAM_NAME)
+			os.Exit(ERREXIT_USAGE)
+		}
+		initDir(flag.Arg(0))
+	}
+	if flag.NArg() < 2 {
+		fmt.Printf("usage: %s [OPTIONS] CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
+		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)
+	}
+
+	key := make([]byte, cryptfs.KEY_LEN)
+	if zerokey {
+		fmt.Printf("Zerokey mode active: using all-zero dummy master key.\n")
+		fmt.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING.\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)
+		}
+		fmt.Printf("Password: ")
+		password := readPassword()
+		fmt.Printf("\nDecrypting master key... ")
+		key, err = cryptfs.LoadConfFile(cfname, password)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(ERREXIT_LOADCONF)
+		}
+		fmt.Printf("Success\n")
+		printMasterKey(key)
+	}
+
+	pathfsFrontend(key, cipherdir, mountpoint, fusedebug)
+}
+
+// printMasterKey - remind the user that he should store the master key in
+// a safe place
+func printMasterKey(key []byte) {
+	h := hex.EncodeToString(key)
+	// Make it less scary by splitting it up in chunks
+	h = h[0:8] + "-" + h[8:16] + "-" + h[16:24] + "-" + h[24:32]
+
+	fmt.Printf(`
+WARNING:
+  If the gocryptfs config file becomes corrupted or you ever
+  forget your password, there is only one hope for recovery:
+  The master key. Print it to a piece of paper and store it in a drawer.
+
+  Master key: %s
+
+`, h)
+}
+
+func readPasswordTwice() string {
+	fmt.Printf("Password: ")
+	p1 := readPassword()
+	fmt.Printf("\nRepeat: ")
+	p2 := readPassword()
+	fmt.Printf("\n")
+	if p1 != p2 {
+		fmt.Printf("Passwords do not match\n")
+		os.Exit(ERREXIT_PASSWORD)
+	}
+	return p1
+}
+
+// Get password from terminal
+func readPassword() string {
+	fd := int(os.Stdin.Fd())
+	p, err := terminal.ReadPassword(fd)
+	if err != nil {
+		fmt.Printf("Error: Could not read password: %s\n")
+		os.Exit(ERREXIT_PASSWORD)
+	}
+	return string(p)
+}
+
+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) {
+
+	finalFs := pathfs_frontend.NewFS(key, cipherdir, USE_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"
+
+	state, err := fuse.NewServer(conn.RawFS(), mountpoint, &mOpts)
+	if err != nil {
+		fmt.Printf("Mount fail: %v\n", err)
+		os.Exit(1)
+	}
+	state.SetDebug(debug)
+
+	fmt.Println("Mounted.")
+	state.Serve()
+}