Add pathfs frontend (uses go-fuse instead of bazil-fuse), part I
Currently fails main_test.go, will be fixed in part II
This commit is contained in:
parent
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7
.gitignore
vendored
7
.gitignore
vendored
@ -1,2 +1,9 @@
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# Binary
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/gocryptfs
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# Manual test mounts
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/cipherdir
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/mountpoint
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# main_test.go temporary files
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/main_test_tmp
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@ -77,7 +77,7 @@ func (be *CryptFS) EncryptBlock(plaintext []byte) []byte {
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return ciphertext
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}
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// Split a plaintext byte range into (possible partial) blocks
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// Split a plaintext byte range into (possibly partial) blocks
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func (be *CryptFS) SplitRange(offset uint64, length uint64) []intraBlock {
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var b intraBlock
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var parts []intraBlock
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@ -113,6 +113,22 @@ func (be *CryptFS) minu64(x uint64, y uint64) uint64 {
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return y
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}
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// CiphertextRange - Get byte range in backing ciphertext corresponding
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// to plaintext range. Returns a range aligned to ciphertext blocks.
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func (be *CryptFS) CiphertextRange(offset uint64, length uint64) (uint64, uint64, int) {
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// Decrypting the ciphertext will yield too many plaintext bytes. Skip this number
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// of bytes from the front.
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skip := offset % be.plainBS
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firstBlockNo := offset / be.plainBS
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lastBlockNo := ( offset + length - 1 ) / be.plainBS
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alignedOffset := firstBlockNo * be.cipherBS
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alignedLength := (lastBlockNo - firstBlockNo + 1) * be.cipherBS
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return alignedOffset, alignedLength, int(skip)
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}
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// Get the byte range in the ciphertext corresponding to blocks
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// (full blocks!)
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func (be *CryptFS) JoinCiphertextRange(blocks []intraBlock) (uint64, uint64) {
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@ -138,3 +154,24 @@ func (be *CryptFS) CropPlaintext(plaintext []byte, blocks []intraBlock) []byte {
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}
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return cropped
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}
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// MergeBlocks - Merge newData into oldData at offset
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// New block may be bigger than both newData and oldData
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func (be *CryptFS) MergeBlocks(oldData []byte, newData []byte, offset int) []byte {
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// Make block of maximum size
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out := make([]byte, be.plainBS)
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// Copy old and new data into it
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copy(out, oldData)
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l := len(newData)
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copy(out[offset:offset + l], newData)
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// Crop to length
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outLen := len(oldData)
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newLen := offset + len(newData)
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if outLen < newLen {
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outLen = newLen
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}
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return out[0:outLen]
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}
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@ -15,5 +15,5 @@ func (l logChannel) Printf(format string, args ...interface{}) {
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}
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var Debug = logChannel{false}
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var Debug = logChannel{true}
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var Warn = logChannel{true}
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77
main.go
77
main.go
@ -1,18 +1,29 @@
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package main
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import (
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"bazil.org/fuse"
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fusefs "bazil.org/fuse/fs"
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"flag"
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"fmt"
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frontend "github.com/rfjakob/gocryptfs/cluefs_frontend"
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"os"
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"path/filepath"
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"time"
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"github.com/rfjakob/gocryptfs/cluefs_frontend"
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"github.com/rfjakob/gocryptfs/pathfs_frontend"
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bazilfuse "bazil.org/fuse"
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bazilfusefs "bazil.org/fuse/fs"
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"github.com/hanwen/go-fuse/fuse"
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"github.com/hanwen/go-fuse/fuse/nodefs"
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"github.com/hanwen/go-fuse/fuse/pathfs"
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)
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const (
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USE_CLUEFS = false
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USE_OPENSSL = false
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PATHFS_DEBUG = false
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PROGRAM_NAME = "gocryptfs"
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USE_OPENSSL = true
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ERREXIT_USAGE = 1
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ERREXIT_NEWFS = 2
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@ -29,27 +40,34 @@ func main() {
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fmt.Printf("usage: %s CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
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os.Exit(ERREXIT_USAGE)
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}
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cipherdir, _ := filepath.Abs(flag.Arg(0))
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mountpoint, err := filepath.Abs(flag.Arg(1))
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mountpoint, _ := filepath.Abs(flag.Arg(1))
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// Create the file system object
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var key [16]byte
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cfs, err := frontend.NewFS(key, cipherdir, USE_OPENSSL)
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if USE_CLUEFS {
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cluefsFrontend(key, cipherdir, mountpoint)
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} else {
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pathfsFrontend(key, cipherdir, mountpoint)
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}
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}
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func cluefsFrontend(key [16]byte, cipherdir string, mountpoint string) {
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cfs, err := cluefs_frontend.NewFS(key, cipherdir, USE_OPENSSL)
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if err != nil {
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fmt.Println(err)
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os.Exit(ERREXIT_NEWFS)
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}
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// Mount the file system
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mountOpts := []fuse.MountOption{
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fuse.FSName(PROGRAM_NAME),
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fuse.Subtype(PROGRAM_NAME),
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fuse.VolumeName(PROGRAM_NAME),
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fuse.LocalVolume(),
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fuse.MaxReadahead(1024 * 1024),
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mountOpts := []bazilfuse.MountOption{
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bazilfuse.FSName(PROGRAM_NAME),
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bazilfuse.Subtype(PROGRAM_NAME),
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bazilfuse.VolumeName(PROGRAM_NAME),
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bazilfuse.LocalVolume(),
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bazilfuse.MaxReadahead(1024 * 1024),
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}
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conn, err := fuse.Mount(mountpoint, mountOpts...)
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conn, err := bazilfuse.Mount(mountpoint, mountOpts...)
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if err != nil {
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fmt.Println(err)
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os.Exit(ERREXIT_MOUNT)
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@ -57,7 +75,7 @@ func main() {
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defer conn.Close()
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// Start serving requests
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if err = fusefs.Serve(conn, cfs); err != nil {
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if err = bazilfusefs.Serve(conn, cfs); err != nil {
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fmt.Println(err)
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os.Exit(ERREXIT_SERVE)
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}
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@ -72,3 +90,30 @@ func main() {
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// We are done
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os.Exit(0)
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}
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func pathfsFrontend(key [16]byte, cipherdir string, mountpoint string){
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finalFs := pathfs_frontend.NewFS(key, cipherdir, USE_OPENSSL)
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opts := &nodefs.Options{
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// These options are to be compatible with libfuse defaults,
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// making benchmarking easier.
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NegativeTimeout: time.Second,
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AttrTimeout: time.Second,
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EntryTimeout: time.Second,
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}
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pathFs := pathfs.NewPathNodeFs(finalFs, nil)
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conn := nodefs.NewFileSystemConnector(pathFs.Root(), opts)
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mOpts := &fuse.MountOptions{
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AllowOther: false,
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}
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state, err := fuse.NewServer(conn.RawFS(), mountpoint, mOpts)
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if err != nil {
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fmt.Printf("Mount fail: %v\n", err)
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os.Exit(1)
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}
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state.SetDebug(PATHFS_DEBUG)
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fmt.Println("Mounted!")
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state.Serve()
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}
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@ -12,7 +12,7 @@ import (
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"time"
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)
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const tmpDir = "test_tmp_dir/"
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const tmpDir = "main_test_tmp/"
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const plainDir = tmpDir + "plain/"
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const cipherDir = tmpDir + "cipher/"
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235
pathfs_frontend/file.go
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235
pathfs_frontend/file.go
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@ -0,0 +1,235 @@
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package pathfs_frontend
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import (
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"io"
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"bytes"
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"fmt"
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"os"
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"sync"
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"syscall"
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"time"
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"github.com/hanwen/go-fuse/fuse"
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"github.com/hanwen/go-fuse/fuse/nodefs"
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"github.com/rfjakob/gocryptfs/cryptfs"
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)
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// File - based on loopbackFile in go-fuse/fuse/nodefs/files.go
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type file struct {
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fd *os.File
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// os.File is not threadsafe. Although fd themselves are
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// constant during the lifetime of an open file, the OS may
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// reuse the fd number after it is closed. When open races
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// with another close, they may lead to confusion as which
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// file gets written in the end.
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lock sync.Mutex
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// Was the file opened O_WRONLY?
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writeOnly bool
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// Parent CryptFS
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cfs *cryptfs.CryptFS
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}
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func NewFile(fd *os.File, writeOnly bool, cfs *cryptfs.CryptFS) nodefs.File {
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return &file{
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fd: fd,
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writeOnly: writeOnly,
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cfs: cfs,
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}
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}
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func (f *file) InnerFile() nodefs.File {
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return nil
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}
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func (f *file) SetInode(n *nodefs.Inode) {
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}
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func (f *file) String() string {
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return fmt.Sprintf("cryptFile(%s)", f.fd.Name())
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}
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// Read - FUSE call
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func (f *file) Read(buf []byte, off int64) (resultData fuse.ReadResult, code fuse.Status) {
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cryptfs.Debug.Printf("\n\nGot read request: len=%d off=%d\n", len(buf), off)
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if f.writeOnly {
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return nil, fuse.EBADF
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}
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// Read the backing ciphertext in one go
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alignedOffset, alignedLength, skip := f.cfs.CiphertextRange(uint64(off), uint64(len(buf)))
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ciphertext := make([]byte, int(alignedLength))
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_, err := f.fd.ReadAt(ciphertext, int64(alignedOffset))
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if err != nil && err != io.EOF {
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cryptfs.Warn.Printf("Read error: %s\n", err.Error())
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return nil, fuse.ToStatus(err)
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}
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// Decrypt it
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plaintext, err := f.cfs.DecryptBlocks(ciphertext)
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if err != nil {
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cryptfs.Warn.Printf("Decryption error: %s\n", err.Error())
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return nil, fuse.EIO
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}
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// Crop down to the relevant part
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var out []byte
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lenHave := len(plaintext)
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lenWant := skip + len(buf)
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if lenHave > lenWant {
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out = plaintext[skip:skip + len(buf)]
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} else if lenHave > skip {
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out = plaintext[skip:lenHave]
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}
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// else: out stays empty
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fmt.Printf("Read: returning %d bytes\n", len(plaintext))
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return fuse.ReadResultData(out), fuse.OK
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}
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// Write - FUSE call
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func (f *file) Write(data []byte, off int64) (uint32, fuse.Status) {
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var written uint32
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var status fuse.Status
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dataBuf := bytes.NewBuffer(data)
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blocks := f.cfs.SplitRange(uint64(off), uint64(len(data)))
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for _, b := range(blocks) {
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blockData := dataBuf.Next(int(b.Length))
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// Incomplete block -> Read-Modify-Write
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if b.IsPartial() {
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// Read
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oldData := make([]byte, f.cfs.PlainBS())
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o, _ := b.PlaintextRange()
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res, status := f.Read(oldData, int64(o))
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oldData, _ = res.Bytes(oldData)
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if status != fuse.OK {
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return written, status
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}
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// Modify
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blockData = f.cfs.MergeBlocks(oldData, blockData, int(b.Offset))
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}
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// Write
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blockOffset, _ := b.CiphertextRange()
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blockData = f.cfs.EncryptBlock(blockData)
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_, err := f.fd.WriteAt(blockData, int64(blockOffset))
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if err != nil {
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cryptfs.Warn.Printf("Write failed: %s\n", err.Error())
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status = fuse.ToStatus(err)
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break
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}
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written += uint32(b.Length)
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}
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return written, status
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}
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// Release - FUSE call, forget file
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func (f *file) Release() {
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f.lock.Lock()
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f.fd.Close()
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f.lock.Unlock()
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}
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// Flush - FUSE call
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func (f *file) Flush() fuse.Status {
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f.lock.Lock()
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// Since Flush() may be called for each dup'd fd, we don't
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// want to really close the file, we just want to flush. This
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// is achieved by closing a dup'd fd.
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newFd, err := syscall.Dup(int(f.fd.Fd()))
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f.lock.Unlock()
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if err != nil {
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return fuse.ToStatus(err)
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}
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err = syscall.Close(newFd)
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return fuse.ToStatus(err)
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}
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func (f *file) Fsync(flags int) (code fuse.Status) {
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f.lock.Lock()
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r := fuse.ToStatus(syscall.Fsync(int(f.fd.Fd())))
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f.lock.Unlock()
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return r
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}
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func (f *file) Truncate(size uint64) fuse.Status {
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f.lock.Lock()
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r := fuse.ToStatus(syscall.Ftruncate(int(f.fd.Fd()), int64(size)))
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f.lock.Unlock()
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return r
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}
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func (f *file) Chmod(mode uint32) fuse.Status {
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f.lock.Lock()
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r := fuse.ToStatus(f.fd.Chmod(os.FileMode(mode)))
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f.lock.Unlock()
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return r
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}
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func (f *file) Chown(uid uint32, gid uint32) fuse.Status {
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f.lock.Lock()
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r := fuse.ToStatus(f.fd.Chown(int(uid), int(gid)))
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f.lock.Unlock()
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return r
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}
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func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
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st := syscall.Stat_t{}
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f.lock.Lock()
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err := syscall.Fstat(int(f.fd.Fd()), &st)
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f.lock.Unlock()
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if err != nil {
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return fuse.ToStatus(err)
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}
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a.FromStat(&st)
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return fuse.OK
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}
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func (f *file) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
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f.lock.Lock()
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err := syscall.Fallocate(int(f.fd.Fd()), mode, int64(off), int64(sz))
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f.lock.Unlock()
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if err != nil {
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return fuse.ToStatus(err)
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}
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return fuse.OK
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}
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const _UTIME_NOW = ((1 << 30) - 1)
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const _UTIME_OMIT = ((1 << 30) - 2)
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func (f *file) Utimens(a *time.Time, m *time.Time) fuse.Status {
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tv := make([]syscall.Timeval, 2)
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if a == nil {
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tv[0].Usec = _UTIME_OMIT
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} else {
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n := a.UnixNano()
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tv[0] = syscall.NsecToTimeval(n)
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}
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if m == nil {
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tv[1].Usec = _UTIME_OMIT
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} else {
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n := a.UnixNano()
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tv[1] = syscall.NsecToTimeval(n)
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}
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f.lock.Lock()
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err := syscall.Futimes(int(f.fd.Fd()), tv)
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f.lock.Unlock()
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return fuse.ToStatus(err)
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}
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166
pathfs_frontend/fs.go
Normal file
166
pathfs_frontend/fs.go
Normal file
@ -0,0 +1,166 @@
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package pathfs_frontend
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import (
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"os"
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"path/filepath"
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"time"
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"fmt"
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"github.com/hanwen/go-fuse/fuse"
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"github.com/hanwen/go-fuse/fuse/nodefs"
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"github.com/hanwen/go-fuse/fuse/pathfs"
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"github.com/rfjakob/gocryptfs/cryptfs"
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)
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type FS struct {
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*cryptfs.CryptFS
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pathfs.FileSystem // loopbackFileSystem
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backing string // Backing directory
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}
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// Encrypted FUSE overlay filesystem
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func NewFS(key [16]byte, backing string, useOpenssl bool) *FS {
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return &FS{
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CryptFS: cryptfs.NewCryptFS(key, useOpenssl),
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FileSystem: pathfs.NewLoopbackFileSystem(backing),
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backing: backing,
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}
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}
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// GetPath - get the absolute path of the backing file
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func (fs *FS) GetPath(relPath string) string {
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return filepath.Join(fs.backing, fs.EncryptPath(relPath))
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}
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func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
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a, status := fs.FileSystem.GetAttr(fs.EncryptPath(name), context)
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if a == nil {
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return a, status
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}
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a.Size = fs.PlainSize(a.Size)
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return a, status
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}
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|
||||
func (fs *FS) OpenDir(name string, context *fuse.Context) ([]fuse.DirEntry, fuse.Status) {
|
||||
cipherEntries, status := fs.FileSystem.OpenDir(fs.EncryptPath(name), context);
|
||||
var plain []fuse.DirEntry
|
||||
var skipped int
|
||||
if cipherEntries != nil {
|
||||
for i := range cipherEntries {
|
||||
n, err := fs.DecryptPath(cipherEntries[i].Name)
|
||||
if err != nil {
|
||||
fmt.Printf("Skipping invalid filename \"%s\": %s\n", cipherEntries[i].Name, err)
|
||||
skipped++
|
||||
continue
|
||||
}
|
||||
cipherEntries[i].Name = n
|
||||
plain = append(plain, cipherEntries[i])
|
||||
}
|
||||
}
|
||||
return plain, status
|
||||
}
|
||||
|
||||
// We always need read access to do read-modify-write cycles
|
||||
func (fs *FS) mangleOpenFlags(flags uint32) (newFlags int, writeOnly bool) {
|
||||
newFlags = int(flags)
|
||||
if newFlags & os.O_WRONLY > 0 {
|
||||
writeOnly = true
|
||||
newFlags = newFlags ^ os.O_WRONLY | os.O_RDWR
|
||||
}
|
||||
// We also cannot open the file in append mode, we need to seek back for RMW
|
||||
newFlags = newFlags &^ os.O_APPEND
|
||||
|
||||
return newFlags, writeOnly
|
||||
}
|
||||
|
||||
func (fs *FS) Open(name string, flags uint32, context *fuse.Context) (fuseFile nodefs.File, status fuse.Status) {
|
||||
cryptfs.Debug.Printf("Open(%s)\n", name)
|
||||
|
||||
iflags, writeOnly := fs.mangleOpenFlags(flags)
|
||||
f, err := os.OpenFile(fs.GetPath(name), iflags, 0666)
|
||||
if err != nil {
|
||||
return nil, fuse.ToStatus(err)
|
||||
}
|
||||
|
||||
return NewFile(f, writeOnly, fs.CryptFS), fuse.OK
|
||||
}
|
||||
|
||||
func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Context) (fuseFile nodefs.File, code fuse.Status) {
|
||||
iflags, writeOnly := fs.mangleOpenFlags(flags)
|
||||
f, err := os.OpenFile(fs.GetPath(path), iflags|os.O_CREATE, os.FileMode(mode))
|
||||
if err != nil {
|
||||
return nil, fuse.ToStatus(err)
|
||||
}
|
||||
return NewFile(f, writeOnly, fs.CryptFS), fuse.OK
|
||||
}
|
||||
|
||||
func (fs *FS) Chmod(path string, mode uint32, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Chmod(fs.EncryptPath(path), mode, context)
|
||||
}
|
||||
|
||||
func (fs *FS) Chown(path string, uid uint32, gid uint32, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Chmod(fs.EncryptPath(path), gid, context)
|
||||
}
|
||||
|
||||
func (fs *FS) Truncate(path string, offset uint64, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Truncate(fs.EncryptPath(path), offset, context)
|
||||
}
|
||||
|
||||
func (fs *FS) Utimens(path string, Atime *time.Time, Mtime *time.Time, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Utimens(fs.EncryptPath(path), Atime, Mtime, context)
|
||||
}
|
||||
|
||||
func (fs *FS) Readlink(name string, context *fuse.Context) (out string, code fuse.Status) {
|
||||
return fs.FileSystem.Readlink(fs.EncryptPath(name), context)
|
||||
}
|
||||
|
||||
func (fs *FS) Mknod(name string, mode uint32, dev uint32, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Mknod(fs.EncryptPath(name), mode, dev, context)
|
||||
}
|
||||
|
||||
func (fs *FS) Mkdir(path string, mode uint32, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Mkdir(fs.EncryptPath(path), mode, context)
|
||||
}
|
||||
|
||||
func (fs *FS) Unlink(name string, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Unlink(fs.EncryptPath(name), context)
|
||||
}
|
||||
|
||||
func (fs *FS) Rmdir(name string, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Rmdir(fs.EncryptPath(name), context)
|
||||
}
|
||||
|
||||
func (fs *FS) Symlink(pointedTo string, linkName string, context *fuse.Context) (code fuse.Status) {
|
||||
// TODO symlink encryption
|
||||
return fs.FileSystem.Symlink(fs.EncryptPath(pointedTo), fs.EncryptPath(linkName), context)
|
||||
}
|
||||
|
||||
func (fs *FS) Rename(oldPath string, newPath string, context *fuse.Context) (codee fuse.Status) {
|
||||
return fs.FileSystem.Rename(fs.EncryptPath(oldPath), fs.EncryptPath(newPath), context)
|
||||
}
|
||||
|
||||
func (fs *FS) Link(orig string, newName string, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Link(fs.EncryptPath(orig), fs.EncryptPath(newName), context)
|
||||
}
|
||||
|
||||
func (fs *FS) Access(name string, mode uint32, context *fuse.Context) (code fuse.Status) {
|
||||
return fs.FileSystem.Access(fs.EncryptPath(name), mode, context)
|
||||
}
|
||||
|
||||
func (fs *FS) GetXAttr(name string, attr string, context *fuse.Context) ([]byte, fuse.Status) {
|
||||
return nil, fuse.ENOSYS
|
||||
}
|
||||
|
||||
func (fs *FS) SetXAttr(name string, attr string, data []byte, flags int, context *fuse.Context) fuse.Status {
|
||||
return fuse.ENOSYS
|
||||
}
|
||||
|
||||
func (fs *FS) ListXAttr(name string, context *fuse.Context) ([]string, fuse.Status) {
|
||||
return nil, fuse.ENOSYS
|
||||
}
|
||||
|
||||
func (fs *FS) RemoveXAttr(name string, attr string, context *fuse.Context) fuse.Status {
|
||||
return fuse.ENOSYS
|
||||
}
|
Loading…
Reference in New Issue
Block a user