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Diffstat (limited to 'main.go')
-rw-r--r--main.go245
1 files changed, 140 insertions, 105 deletions
diff --git a/main.go b/main.go
index 0f3fb4f..ece032e 100644
--- a/main.go
+++ b/main.go
@@ -36,19 +36,16 @@ const (
// GitVersion will be set by the build script "build.bash"
var GitVersion = "[version not set - please compile using ./build.bash]"
-func initDir(dirArg string, plaintextNames bool) {
- dir, _ := filepath.Abs(dirArg)
-
- err := checkDirEmpty(dir)
+func initDir(args *argContainer) {
+ err := checkDirEmpty(args.cipherdir)
if err != nil {
fmt.Printf("Invalid CIPHERDIR: %v\n", err)
os.Exit(ERREXIT_INIT)
}
- confName := filepath.Join(dir, cryptfs.ConfDefaultName)
cryptfs.Info.Printf("Choose a password for protecting your files.\n")
password := readPasswordTwice()
- err = cryptfs.CreateConfFile(confName, password, plaintextNames)
+ err = cryptfs.CreateConfFile(args.config, password, args.plaintextnames)
if err != nil {
fmt.Println(err)
os.Exit(ERREXIT_INIT)
@@ -58,23 +55,71 @@ func initDir(dirArg string, plaintextNames bool) {
}
func usageText() {
- fmt.Fprintf(os.Stderr, "Usage: %s -init [OPTIONS] CIPHERDIR\n", PROGRAM_NAME)
- fmt.Fprintf(os.Stderr, " %s [OPTIONS] CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
- fmt.Fprintf(os.Stderr, "\nOptions:\n")
+ printVersion()
+ fmt.Printf("\n")
+ fmt.Printf("Usage: %s -init|-passwd [OPTIONS] CIPHERDIR\n", PROGRAM_NAME)
+ fmt.Printf(" or %s [OPTIONS] CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
+ fmt.Printf("\nOptions:\n")
flagSet.PrintDefaults()
}
type argContainer struct {
debug, init, zerokey, fusedebug, openssl, passwd, foreground, version,
plaintextnames, quiet bool
- masterkey, mountpoint, cipherdir, cpuprofile string
+ masterkey, mountpoint, cipherdir, cpuprofile, config string
notifypid int
}
var flagSet *flag.FlagSet
+// loadConfig - load the config file "filename", prompting the user for the password
+func loadConfig(filename string) (masterkey []byte, confFile *cryptfs.ConfFile) {
+ // Check if the file exists at all before prompting for a password
+ _, err := os.Stat(filename)
+ if err != nil {
+ fmt.Print(err)
+ os.Exit(ERREXIT_LOADCONF)
+ }
+ fmt.Printf("Password: ")
+ pw := readPassword()
+ cryptfs.Info.Printf("Decrypting master key... ")
+ cryptfs.Warn.Disable() // Silence DecryptBlock() error messages on incorrect password
+ masterkey, confFile, err = cryptfs.LoadConfFile(filename, pw)
+ cryptfs.Warn.Enable()
+ if err != nil {
+ fmt.Println(err)
+ fmt.Println("Wrong password.")
+ os.Exit(ERREXIT_LOADCONF)
+ }
+ cryptfs.Info.Printf("done.\n")
+
+ return masterkey, confFile
+}
+
+// changePassword - change the password of config file "filename"
+func changePassword(filename string) {
+ masterkey, confFile := loadConfig(filename)
+ fmt.Printf("Please enter your new password.\n")
+ newPw := readPasswordTwice()
+ confFile.EncryptKey(masterkey, newPw)
+ err := confFile.WriteFile()
+ if err != nil {
+ fmt.Println(err)
+ os.Exit(ERREXIT_INIT)
+ }
+ cryptfs.Info.Printf("Password changed.\n")
+ os.Exit(0)
+}
+
+// printVersion - print a version string like
+// "gocryptfs v0.3.1-31-g6736212-dirty; on-disk format 2"
+func printVersion() {
+ fmt.Printf("%s %s; on-disk format %d\n", PROGRAM_NAME, GitVersion, cryptfs.HEADER_CURRENT_VERSION)
+}
+
func main() {
runtime.GOMAXPROCS(4)
+ var err error
// Parse command line arguments
var args argContainer
@@ -93,20 +138,54 @@ func main() {
flagSet.BoolVar(&args.quiet, "q", false, "Quiet - silence informational messages")
flagSet.StringVar(&args.masterkey, "masterkey", "", "Mount with explicit master key")
flagSet.StringVar(&args.cpuprofile, "cpuprofile", "", "Write cpu profile to specified file")
+ flagSet.StringVar(&args.config, "config", "", "Use specified config file instead of CIPHERDIR/gocryptfs.conf")
flagSet.IntVar(&args.notifypid, "notifypid", 0, "Send USR1 to the specified process after "+
"successful mount - used internally for daemonization")
flagSet.Parse(os.Args[1:])
+ if args.debug {
+ cryptfs.Debug.Enable()
+ cryptfs.Debug.Printf("Debug output enabled\n")
+ }
+ // By default, let the child handle everything.
+ // The parent *could* handle operations that do not require backgrounding by
+ // itself, but that would make the code paths more complicated.
+ if !args.foreground {
+ forkChild() // does not return
+ }
+ // Getting here means we *are* the child
+ // "-v"
if args.version {
- fmt.Printf("%s %s; on-disk format %d\n", PROGRAM_NAME, GitVersion, cryptfs.HEADER_CURRENT_VERSION)
+ printVersion()
os.Exit(0)
}
+ // 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 {
+ fmt.Printf("Invalid CIPHERDIR: %v\n", err)
+ os.Exit(ERREXIT_CIPHERDIR)
+ }
+ } else {
+ usageText()
+ os.Exit(ERREXIT_USAGE)
+ }
+ // "-q"
if args.quiet {
cryptfs.Info.Disable()
}
- if !args.foreground {
- daemonize() // does not return
+ // "-config"
+ if args.config != "" {
+ args.config, err = filepath.Abs(args.config)
+ if err != nil {
+ fmt.Printf("Invalid \"-config\" setting: %v\n", err)
+ }
+ cryptfs.Info.Printf("Using config file at custom location %s\n", args.config)
+ } else {
+ args.config = filepath.Join(args.cipherdir, cryptfs.ConfDefaultName)
}
+ // "-cpuprofile"
if args.cpuprofile != "" {
f, err := os.Create(args.cpuprofile)
if err != nil {
@@ -117,123 +196,79 @@ func main() {
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
- if args.debug {
- cryptfs.Debug.Enable()
- cryptfs.Debug.Printf("Debug output enabled\n")
- }
+ // "-openssl"
if args.openssl == false {
cryptfs.Info.Printf("Openssl disabled\n")
}
+ // Operation flags: init, passwd or mount
+ // "-init"
if args.init {
- if flagSet.NArg() != 1 && args.plaintextnames == false {
- fmt.Printf("Usage: %s --init [--plaintextnames] CIPHERDIR\n", PROGRAM_NAME)
+ if flagSet.NArg() > 1 {
+ fmt.Printf("Usage: %s -init [OPTIONS] CIPHERDIR\n", PROGRAM_NAME)
os.Exit(ERREXIT_USAGE)
}
- initDir(flagSet.Arg(0), args.plaintextnames) // does not return
+ initDir(&args) // does not return
}
+ // "-passwd"
if args.passwd {
- if flagSet.NArg() != 1 {
- fmt.Printf("Usage: %s --passwd CIPHERDIR\n", PROGRAM_NAME)
- os.Exit(ERREXIT_USAGE)
- }
- } else {
- // Normal mount
- if flagSet.NArg() < 2 {
- usageText()
+ if flagSet.NArg() > 1 {
+ fmt.Printf("Usage: %s -passwd [OPTIONS] CIPHERDIR\n", PROGRAM_NAME)
os.Exit(ERREXIT_USAGE)
}
- args.mountpoint, _ = filepath.Abs(flagSet.Arg(1))
- err := checkDirEmpty(args.mountpoint)
- if err != nil {
- fmt.Printf("Invalid MOUNTPOINT: %v\n", err)
- os.Exit(ERREXIT_MOUNTPOINT)
- }
+ changePassword(args.config) // does not return
}
- args.cipherdir, _ = filepath.Abs(flagSet.Arg(0))
- err := checkDir(args.cipherdir)
- if err != nil {
- fmt.Printf("Invalid CIPHERDIR: %v\n", err)
- os.Exit(ERREXIT_CIPHERDIR)
- }
-
- var plaintextNames bool
- var cf *cryptfs.ConfFile
- var currentPassword string
- key := make([]byte, cryptfs.KEY_LEN)
- if args.zerokey {
- cryptfs.Info.Printf("Zerokey mode active: using all-zero dummy master key.\n")
- plaintextNames = args.plaintextnames
- } else if len(args.masterkey) > 0 {
- key = parseMasterKey(args.masterkey)
- cryptfs.Info.Printf("Using explicit master key.\n")
- } else {
- // Load config file
- cfname := filepath.Join(args.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", os.Args[0], flagSet.Arg(0))
- os.Exit(ERREXIT_LOADCONF)
- }
- if args.passwd == true {
- fmt.Printf("Old password: ")
- } else {
- fmt.Printf("Password: ")
- }
- currentPassword = readPassword()
- cryptfs.Info.Printf("Decrypting 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)
- os.Exit(ERREXIT_LOADCONF)
- }
- cryptfs.Info.Printf("done.\n")
+ // Mount
+ // Check mountpoint
+ if flagSet.NArg() < 2 {
+ usageText()
+ os.Exit(ERREXIT_USAGE)
}
- if args.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(ERREXIT_PASSWORD)
- }
- cf.EncryptKey(key, newPassword)
- err := cf.WriteFile()
- if err != nil {
- fmt.Println(err)
- os.Exit(ERREXIT_INIT)
- }
- cryptfs.Info.Printf("Password changed.\n")
- os.Exit(0)
+ args.mountpoint, err = filepath.Abs(flagSet.Arg(1))
+ if err != nil {
+ fmt.Printf("Invalid MOUNTPOINT: %v\n", err)
+ os.Exit(ERREXIT_MOUNTPOINT)
}
-
- if cf != nil {
- plaintextNames = cf.PlaintextNames()
+ err = checkDirEmpty(args.mountpoint)
+ if err != nil {
+ fmt.Printf("Invalid MOUNTPOINT: %v\n", err)
+ os.Exit(ERREXIT_MOUNTPOINT)
}
- srv := pathfsFrontend(key, args.cipherdir, args.mountpoint, args.fusedebug, args.openssl, plaintextNames)
-
- if args.zerokey == false && len(args.masterkey) == 0 {
- printMasterKey(key)
- } else if args.zerokey == true {
- cryptfs.Info.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING.\n")
- } else if len(args.masterkey) > 0 {
+ // Get master key
+ var masterkey []byte
+ if args.masterkey != "" {
+ // "-masterkey"
+ cryptfs.Info.Printf("Using explicit master key.\n")
+ masterkey = parseMasterKey(args.masterkey)
cryptfs.Info.Printf("THE MASTER KEY IS VISIBLE VIA \"ps -auxwww\", ONLY USE THIS MODE FOR EMERGENCIES.\n")
+ } else if args.zerokey {
+ // "-zerokey"
+ cryptfs.Info.Printf("Using all-zero dummy master key.\n")
+ cryptfs.Info.Printf("ZEROKEY MODE PROVIDES NO SECURITY AT ALL AND SHOULD ONLY BE USED FOR TESTING.\n")
+ masterkey = make([]byte, cryptfs.KEY_LEN)
+ } else {
+ // Load master key from config file
+ var confFile *cryptfs.ConfFile
+ masterkey, confFile = loadConfig(args.config)
+ printMasterKey(masterkey)
+ args.plaintextnames = confFile.PlaintextNames()
}
-
+ // Initialize FUSE server
+ srv := pathfsFrontend(masterkey, args.cipherdir, args.mountpoint, args.fusedebug, args.openssl, args.plaintextnames)
cryptfs.Info.Println("Filesystem ready.")
- // Send USR1 notification
+ // We are ready - send USR1 signal to our parent
if args.notifypid > 0 {
sendUsr1(args.notifypid)
}
- // Wait for SIGING in the background and unmount ourselves if we get it
- // This prevents a dangling "Transport endpoint is not connected" mountpoint
+ // Wait for SIGINT in the background and unmount ourselves if we get it.
+ // This prevents a dangling "Transport endpoint is not connected" mountpoint.
handleSigint(srv, args.mountpoint)
// Jump into server loop. Returns when it gets an umount request from the kernel.
srv.Serve()
- // main returns with code 0
+ // main exits with code 0
}
+// pathfsFrontend - initialize FUSE server based on go-fuse's PathFS
+// Calls os.Exit on errors
func pathfsFrontend(key []byte, cipherdir string, mountpoint string,
debug bool, openssl bool, plaintextNames bool) *fuse.Server {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 05:07:31 +0000