libgocryptfs/main.go

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package main
import (
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"fmt"
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"os"
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"path/filepath"
"runtime"
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"runtime/pprof"
"strconv"
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"time"
Major refactoring: Split up "cryptfs" into several internal packages "git status" for reference: deleted: cryptfs/cryptfs.go deleted: cryptfs/names_core.go modified: integration_tests/cli_test.go modified: integration_tests/helpers.go renamed: cryptfs/config_file.go -> internal/configfile/config_file.go renamed: cryptfs/config_test.go -> internal/configfile/config_test.go renamed: cryptfs/config_test/.gitignore -> internal/configfile/config_test/.gitignore renamed: cryptfs/config_test/PlaintextNames.conf -> internal/configfile/config_test/PlaintextNames.conf renamed: cryptfs/config_test/StrangeFeature.conf -> internal/configfile/config_test/StrangeFeature.conf renamed: cryptfs/config_test/v1.conf -> internal/configfile/config_test/v1.conf renamed: cryptfs/config_test/v2.conf -> internal/configfile/config_test/v2.conf renamed: cryptfs/kdf.go -> internal/configfile/kdf.go renamed: cryptfs/kdf_test.go -> internal/configfile/kdf_test.go renamed: cryptfs/cryptfs_content.go -> internal/contentenc/content.go new file: internal/contentenc/content_api.go renamed: cryptfs/content_test.go -> internal/contentenc/content_test.go renamed: cryptfs/file_header.go -> internal/contentenc/file_header.go renamed: cryptfs/intrablock.go -> internal/contentenc/intrablock.go renamed: cryptfs/address_translation.go -> internal/contentenc/offsets.go new file: internal/cryptocore/crypto_api.go renamed: cryptfs/gcm_go1.4.go -> internal/cryptocore/gcm_go1.4.go renamed: cryptfs/gcm_go1.5.go -> internal/cryptocore/gcm_go1.5.go renamed: cryptfs/nonce.go -> internal/cryptocore/nonce.go renamed: cryptfs/openssl_aead.go -> internal/cryptocore/openssl_aead.go renamed: cryptfs/openssl_benchmark.bash -> internal/cryptocore/openssl_benchmark.bash renamed: cryptfs/openssl_test.go -> internal/cryptocore/openssl_test.go new file: internal/nametransform/name_api.go new file: internal/nametransform/names_core.go renamed: cryptfs/names_diriv.go -> internal/nametransform/names_diriv.go renamed: cryptfs/names_noiv.go -> internal/nametransform/names_noiv.go renamed: cryptfs/names_test.go -> internal/nametransform/names_test.go new file: internal/nametransform/pad16.go renamed: cryptfs/log.go -> internal/toggledlog/log.go renamed: cryptfs/log_go1.4.go -> internal/toggledlog/log_go1.4.go renamed: cryptfs/log_go1.5.go -> internal/toggledlog/log_go1.5.go modified: main.go modified: masterkey.go modified: pathfs_frontend/file.go modified: pathfs_frontend/file_holes.go modified: pathfs_frontend/fs.go modified: pathfs_frontend/fs_dir.go modified: pathfs_frontend/names.go modified: test.bash
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"github.com/rfjakob/gocryptfs/internal/configfile"
"github.com/rfjakob/gocryptfs/internal/contentenc"
"github.com/rfjakob/gocryptfs/internal/readpassword"
"github.com/rfjakob/gocryptfs/internal/stupidgcm"
"github.com/rfjakob/gocryptfs/internal/tlog"
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)
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// Exit codes
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const (
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ErrExitUsage = 1
ErrExitMount = 3
ErrExitCipherDir = 6
ErrExitInit = 7
ErrExitLoadConf = 8
ErrExitMountPoint = 10
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)
const pleaseBuildBash = "[not set - please compile using ./build.bash]"
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// GitVersion is the gocryptfs version according to git, set by build.bash
var GitVersion = pleaseBuildBash
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// GitVersionFuse is the go-fuse library version, set by build.bash
var GitVersionFuse = pleaseBuildBash
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// BuildTime is the Unix timestamp, set by build.bash
var BuildTime = "0"
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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()
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}
// 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)
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)
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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())
fmt.Printf("%s %s%s; go-fuse %s; %s\n",
tlog.ProgramName, GitVersion, buildFlags, GitVersionFuse, built)
}
func main() {
runtime.GOMAXPROCS(4)
var err error
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// Parse all command-line options (i.e. arguments starting with "-")
// into "args". Path arguments are parsed below.
args := parseCliOpts()
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// 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)
}
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)
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os.Exit(ErrExitCipherDir)
}
} else {
usageText()
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os.Exit(ErrExitUsage)
}
// "-q"
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if args.quiet {
tlog.Info.Enabled = false
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}
// "-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)
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os.Exit(ErrExitInit)
}
tlog.Info.Printf("Using config file at custom location %s", args.config)
args._configCustom = true
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} else if args.reverse {
args.config = filepath.Join(args.cipherdir, configfile.ConfReverseName)
} else {
Major refactoring: Split up "cryptfs" into several internal packages "git status" for reference: deleted: cryptfs/cryptfs.go deleted: cryptfs/names_core.go modified: integration_tests/cli_test.go modified: integration_tests/helpers.go renamed: cryptfs/config_file.go -> internal/configfile/config_file.go renamed: cryptfs/config_test.go -> internal/configfile/config_test.go renamed: cryptfs/config_test/.gitignore -> internal/configfile/config_test/.gitignore renamed: cryptfs/config_test/PlaintextNames.conf -> internal/configfile/config_test/PlaintextNames.conf renamed: cryptfs/config_test/StrangeFeature.conf -> internal/configfile/config_test/StrangeFeature.conf renamed: cryptfs/config_test/v1.conf -> internal/configfile/config_test/v1.conf renamed: cryptfs/config_test/v2.conf -> internal/configfile/config_test/v2.conf renamed: cryptfs/kdf.go -> internal/configfile/kdf.go renamed: cryptfs/kdf_test.go -> internal/configfile/kdf_test.go renamed: cryptfs/cryptfs_content.go -> internal/contentenc/content.go new file: internal/contentenc/content_api.go renamed: cryptfs/content_test.go -> internal/contentenc/content_test.go renamed: cryptfs/file_header.go -> internal/contentenc/file_header.go renamed: cryptfs/intrablock.go -> internal/contentenc/intrablock.go renamed: cryptfs/address_translation.go -> internal/contentenc/offsets.go new file: internal/cryptocore/crypto_api.go renamed: cryptfs/gcm_go1.4.go -> internal/cryptocore/gcm_go1.4.go renamed: cryptfs/gcm_go1.5.go -> internal/cryptocore/gcm_go1.5.go renamed: cryptfs/nonce.go -> internal/cryptocore/nonce.go renamed: cryptfs/openssl_aead.go -> internal/cryptocore/openssl_aead.go renamed: cryptfs/openssl_benchmark.bash -> internal/cryptocore/openssl_benchmark.bash renamed: cryptfs/openssl_test.go -> internal/cryptocore/openssl_test.go new file: internal/nametransform/name_api.go new file: internal/nametransform/names_core.go renamed: cryptfs/names_diriv.go -> internal/nametransform/names_diriv.go renamed: cryptfs/names_noiv.go -> internal/nametransform/names_noiv.go renamed: cryptfs/names_test.go -> internal/nametransform/names_test.go new file: internal/nametransform/pad16.go renamed: cryptfs/log.go -> internal/toggledlog/log.go renamed: cryptfs/log_go1.4.go -> internal/toggledlog/log_go1.4.go renamed: cryptfs/log_go1.5.go -> internal/toggledlog/log_go1.5.go modified: main.go modified: masterkey.go modified: pathfs_frontend/file.go modified: pathfs_frontend/file_holes.go modified: pathfs_frontend/fs.go modified: pathfs_frontend/fs_dir.go modified: pathfs_frontend/names.go modified: test.bash
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args.config = filepath.Join(args.cipherdir, configfile.ConfDefaultName)
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}
// "-cpuprofile"
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if args.cpuprofile != "" {
tlog.Info.Printf("Writing CPU profile to %s", args.cpuprofile)
var f *os.File
f, err = os.Create(args.cpuprofile)
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if err != nil {
tlog.Fatal.Println(err)
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os.Exit(ErrExitInit)
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}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
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// "-memprofile"
if args.memprofile != "" {
tlog.Info.Printf("Writing mem profile to %s", args.memprofile)
var f *os.File
f, err = os.Create(args.memprofile)
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if err != nil {
tlog.Fatal.Println(err)
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os.Exit(ErrExitInit)
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}
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")
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}
// "-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)
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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)
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os.Exit(ErrExitUsage)
}
changePassword(&args) // does not return
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}
// 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
}