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path: root/pathfs_frontend/file.go
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Diffstat (limited to 'pathfs_frontend/file.go')
-rw-r--r--pathfs_frontend/file.go112
1 files changed, 57 insertions, 55 deletions
diff --git a/pathfs_frontend/file.go b/pathfs_frontend/file.go
index 33ad0c7..387eb35 100644
--- a/pathfs_frontend/file.go
+++ b/pathfs_frontend/file.go
@@ -13,7 +13,9 @@ import (
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
- "github.com/rfjakob/gocryptfs/cryptfs"
+
+ "github.com/rfjakob/gocryptfs/internal/contentenc"
+ "github.com/rfjakob/gocryptfs/internal/toggledlog"
)
// File - based on loopbackFile in go-fuse/fuse/nodefs/files.go
@@ -29,19 +31,19 @@ type file struct {
// Was the file opened O_WRONLY?
writeOnly bool
- // Parent CryptFS
- cfs *cryptfs.CryptFS
+ // Content encryption helper
+ contentEnc *contentenc.ContentEnc
// Inode number
ino uint64
// File header
- header *cryptfs.FileHeader
+ header *contentenc.FileHeader
forgotten bool
}
-func NewFile(fd *os.File, writeOnly bool, cfs *cryptfs.CryptFS) nodefs.File {
+func NewFile(fd *os.File, writeOnly bool, contentEnc *contentenc.ContentEnc) nodefs.File {
var st syscall.Stat_t
syscall.Fstat(int(fd.Fd()), &st)
wlock.register(st.Ino)
@@ -49,7 +51,7 @@ func NewFile(fd *os.File, writeOnly bool, cfs *cryptfs.CryptFS) nodefs.File {
return &file{
fd: fd,
writeOnly: writeOnly,
- cfs: cfs,
+ contentEnc: contentEnc,
ino: st.Ino,
}
}
@@ -71,12 +73,12 @@ func (f *file) SetInode(n *nodefs.Inode) {
//
// Returns io.EOF if the file is empty
func (f *file) readHeader() error {
- buf := make([]byte, cryptfs.HEADER_LEN)
+ buf := make([]byte, contentenc.HEADER_LEN)
_, err := f.fd.ReadAt(buf, 0)
if err != nil {
return err
}
- h, err := cryptfs.ParseHeader(buf)
+ h, err := contentenc.ParseHeader(buf)
if err != nil {
return err
}
@@ -87,13 +89,13 @@ func (f *file) readHeader() error {
// createHeader - create a new random header and write it to disk
func (f *file) createHeader() error {
- h := cryptfs.RandomHeader()
+ h := contentenc.RandomHeader()
buf := h.Pack()
// Prevent partially written (=corrupt) header by preallocating the space beforehand
- err := prealloc(int(f.fd.Fd()), 0, cryptfs.HEADER_LEN)
+ err := prealloc(int(f.fd.Fd()), 0, contentenc.HEADER_LEN)
if err != nil {
- cryptfs.Warn.Printf("ino%d: createHeader: prealloc failed: %s\n", f.ino, err.Error())
+ toggledlog.Warn.Printf("ino%d: createHeader: prealloc failed: %s\n", f.ino, err.Error())
return err
}
@@ -133,29 +135,29 @@ func (f *file) doRead(off uint64, length uint64) ([]byte, fuse.Status) {
}
// Read the backing ciphertext in one go
- blocks := f.cfs.ExplodePlainRange(off, length)
+ blocks := f.contentEnc.ExplodePlainRange(off, length)
alignedOffset, alignedLength := blocks[0].JointCiphertextRange(blocks)
skip := blocks[0].Skip
- cryptfs.Debug.Printf("JointCiphertextRange(%d, %d) -> %d, %d, %d", off, length, alignedOffset, alignedLength, skip)
+ toggledlog.Debug.Printf("JointCiphertextRange(%d, %d) -> %d, %d, %d", off, length, alignedOffset, alignedLength, skip)
ciphertext := make([]byte, int(alignedLength))
n, err := f.fd.ReadAt(ciphertext, int64(alignedOffset))
if err != nil && err != io.EOF {
- cryptfs.Warn.Printf("read: ReadAt: %s", err.Error())
+ toggledlog.Warn.Printf("read: ReadAt: %s", err.Error())
return nil, fuse.ToStatus(err)
}
// Truncate ciphertext buffer down to actually read bytes
ciphertext = ciphertext[0:n]
firstBlockNo := blocks[0].BlockNo
- cryptfs.Debug.Printf("ReadAt offset=%d bytes (%d blocks), want=%d, got=%d", alignedOffset, firstBlockNo, alignedLength, n)
+ toggledlog.Debug.Printf("ReadAt offset=%d bytes (%d blocks), want=%d, got=%d", alignedOffset, firstBlockNo, alignedLength, n)
// Decrypt it
- plaintext, err := f.cfs.DecryptBlocks(ciphertext, firstBlockNo, f.header.Id)
+ plaintext, err := f.contentEnc.DecryptBlocks(ciphertext, firstBlockNo, f.header.Id)
if err != nil {
- curruptBlockNo := firstBlockNo + f.cfs.PlainOffToBlockNo(uint64(len(plaintext)))
- cipherOff := f.cfs.BlockNoToCipherOff(curruptBlockNo)
- plainOff := f.cfs.BlockNoToPlainOff(curruptBlockNo)
- cryptfs.Warn.Printf("ino%d: doRead: corrupt block #%d (plainOff=%d, cipherOff=%d)",
+ curruptBlockNo := firstBlockNo + f.contentEnc.PlainOffToBlockNo(uint64(len(plaintext)))
+ cipherOff := f.contentEnc.BlockNoToCipherOff(curruptBlockNo)
+ plainOff := f.contentEnc.BlockNoToPlainOff(curruptBlockNo)
+ toggledlog.Warn.Printf("ino%d: doRead: corrupt block #%d (plainOff=%d, cipherOff=%d)",
f.ino, curruptBlockNo, plainOff, cipherOff)
return nil, fuse.EIO
}
@@ -179,23 +181,23 @@ func (f *file) Read(buf []byte, off int64) (resultData fuse.ReadResult, code fus
f.fdLock.RLock()
defer f.fdLock.RUnlock()
- cryptfs.Debug.Printf("ino%d: FUSE Read: offset=%d length=%d", f.ino, len(buf), off)
+ toggledlog.Debug.Printf("ino%d: FUSE Read: offset=%d length=%d", f.ino, len(buf), off)
if f.writeOnly {
- cryptfs.Warn.Printf("ino%d: Tried to read from write-only file", f.ino)
+ toggledlog.Warn.Printf("ino%d: Tried to read from write-only file", f.ino)
return nil, fuse.EBADF
}
out, status := f.doRead(uint64(off), uint64(len(buf)))
if status == fuse.EIO {
- cryptfs.Warn.Printf("ino%d: Read failed with EIO, offset=%d, length=%d", f.ino, len(buf), off)
+ toggledlog.Warn.Printf("ino%d: Read failed with EIO, offset=%d, length=%d", f.ino, len(buf), off)
}
if status != fuse.OK {
return nil, status
}
- cryptfs.Debug.Printf("ino%d: Read: status %v, returning %d bytes", f.ino, status, len(out))
+ toggledlog.Debug.Printf("ino%d: Read: status %v, returning %d bytes", f.ino, status, len(out))
return fuse.ReadResultData(out), status
}
@@ -225,7 +227,7 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
var written uint32
status := fuse.OK
dataBuf := bytes.NewBuffer(data)
- blocks := f.cfs.ExplodePlainRange(uint64(off), uint64(len(data)))
+ blocks := f.contentEnc.ExplodePlainRange(uint64(off), uint64(len(data)))
for _, b := range blocks {
blockData := dataBuf.Next(int(b.Length))
@@ -234,26 +236,26 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
if b.IsPartial() {
// Read
o, _ := b.PlaintextRange()
- oldData, status := f.doRead(o, f.cfs.PlainBS())
+ oldData, status := f.doRead(o, f.contentEnc.PlainBS())
if status != fuse.OK {
- cryptfs.Warn.Printf("ino%d fh%d: RMW read failed: %s", f.ino, f.intFd(), status.String())
+ toggledlog.Warn.Printf("ino%d fh%d: RMW read failed: %s", f.ino, f.intFd(), status.String())
return written, status
}
// Modify
- blockData = f.cfs.MergeBlocks(oldData, blockData, int(b.Skip))
- cryptfs.Debug.Printf("len(oldData)=%d len(blockData)=%d", len(oldData), len(blockData))
+ blockData = f.contentEnc.MergeBlocks(oldData, blockData, int(b.Skip))
+ toggledlog.Debug.Printf("len(oldData)=%d len(blockData)=%d", len(oldData), len(blockData))
}
// Encrypt
blockOffset, blockLen := b.CiphertextRange()
- blockData = f.cfs.EncryptBlock(blockData, b.BlockNo, f.header.Id)
- cryptfs.Debug.Printf("ino%d: Writing %d bytes to block #%d",
- f.ino, uint64(len(blockData))-f.cfs.BlockOverhead(), b.BlockNo)
+ blockData = f.contentEnc.EncryptBlock(blockData, b.BlockNo, f.header.Id)
+ toggledlog.Debug.Printf("ino%d: Writing %d bytes to block #%d",
+ f.ino, uint64(len(blockData))-f.contentEnc.BlockOverhead(), b.BlockNo)
// Prevent partially written (=corrupt) blocks by preallocating the space beforehand
err := prealloc(int(f.fd.Fd()), int64(blockOffset), int64(blockLen))
if err != nil {
- cryptfs.Warn.Printf("ino%d fh%d: doWrite: prealloc failed: %s", f.ino, f.intFd(), err.Error())
+ toggledlog.Warn.Printf("ino%d fh%d: doWrite: prealloc failed: %s", f.ino, f.intFd(), err.Error())
status = fuse.ToStatus(err)
break
}
@@ -262,7 +264,7 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
_, err = f.fd.WriteAt(blockData, int64(blockOffset))
if err != nil {
- cryptfs.Warn.Printf("doWrite: Write failed: %s", err.Error())
+ toggledlog.Warn.Printf("doWrite: Write failed: %s", err.Error())
status = fuse.ToStatus(err)
break
}
@@ -278,18 +280,18 @@ func (f *file) Write(data []byte, off int64) (uint32, fuse.Status) {
wlock.lock(f.ino)
defer wlock.unlock(f.ino)
- cryptfs.Debug.Printf("ino%d: FUSE Write: offset=%d length=%d", f.ino, off, len(data))
+ toggledlog.Debug.Printf("ino%d: FUSE Write: offset=%d length=%d", f.ino, off, len(data))
fi, err := f.fd.Stat()
if err != nil {
- cryptfs.Warn.Printf("Write: Fstat failed: %v", err)
+ toggledlog.Warn.Printf("Write: Fstat failed: %v", err)
return 0, fuse.ToStatus(err)
}
- plainSize := f.cfs.CipherSizeToPlainSize(uint64(fi.Size()))
+ plainSize := f.contentEnc.CipherSizeToPlainSize(uint64(fi.Size()))
if f.createsHole(plainSize, off) {
status := f.zeroPad(plainSize)
if status != fuse.OK {
- cryptfs.Warn.Printf("zeroPad returned error %v", status)
+ toggledlog.Warn.Printf("zeroPad returned error %v", status)
return 0, status
}
}
@@ -337,14 +339,14 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
defer wlock.unlock(f.ino)
if f.forgotten {
- cryptfs.Warn.Printf("ino%d fh%d: Truncate on forgotten file", f.ino, f.intFd())
+ toggledlog.Warn.Printf("ino%d fh%d: Truncate on forgotten file", f.ino, f.intFd())
}
// Common case first: Truncate to zero
if newSize == 0 {
err := syscall.Ftruncate(int(f.fd.Fd()), 0)
if err != nil {
- cryptfs.Warn.Printf("ino%d fh%d: Ftruncate(fd, 0) returned error: %v", f.ino, f.intFd(), err)
+ toggledlog.Warn.Printf("ino%d fh%d: Ftruncate(fd, 0) returned error: %v", f.ino, f.intFd(), err)
return fuse.ToStatus(err)
}
// Truncate to zero kills the file header
@@ -356,14 +358,14 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
// the file
fi, err := f.fd.Stat()
if err != nil {
- cryptfs.Warn.Printf("ino%d fh%d: Truncate: Fstat failed: %v", f.ino, f.intFd(), err)
+ toggledlog.Warn.Printf("ino%d fh%d: Truncate: Fstat failed: %v", f.ino, f.intFd(), err)
return fuse.ToStatus(err)
}
- oldSize := f.cfs.CipherSizeToPlainSize(uint64(fi.Size()))
+ oldSize := f.contentEnc.CipherSizeToPlainSize(uint64(fi.Size()))
{
- oldB := float32(oldSize) / float32(f.cfs.PlainBS())
- newB := float32(newSize) / float32(f.cfs.PlainBS())
- cryptfs.Debug.Printf("ino%d: FUSE Truncate from %.2f to %.2f blocks (%d to %d bytes)", f.ino, oldB, newB, oldSize, newSize)
+ oldB := float32(oldSize) / float32(f.contentEnc.PlainBS())
+ newB := float32(newSize) / float32(f.contentEnc.PlainBS())
+ toggledlog.Debug.Printf("ino%d: FUSE Truncate from %.2f to %.2f blocks (%d to %d bytes)", f.ino, oldB, newB, oldSize, newSize)
}
// File size stays the same - nothing to do
@@ -382,7 +384,7 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
}
}
- blocks := f.cfs.ExplodePlainRange(oldSize, newSize-oldSize)
+ blocks := f.contentEnc.ExplodePlainRange(oldSize, newSize-oldSize)
for _, b := range blocks {
// First and last block may be partial
if b.IsPartial() {
@@ -396,7 +398,7 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
off, length := b.CiphertextRange()
err := syscall.Ftruncate(int(f.fd.Fd()), int64(off+length))
if err != nil {
- cryptfs.Warn.Printf("grow Ftruncate returned error: %v", err)
+ toggledlog.Warn.Printf("grow Ftruncate returned error: %v", err)
return fuse.ToStatus(err)
}
}
@@ -404,23 +406,23 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
return fuse.OK
} else {
// File shrinks
- blockNo := f.cfs.PlainOffToBlockNo(newSize)
- cipherOff := f.cfs.BlockNoToCipherOff(blockNo)
- plainOff := f.cfs.BlockNoToPlainOff(blockNo)
+ blockNo := f.contentEnc.PlainOffToBlockNo(newSize)
+ cipherOff := f.contentEnc.BlockNoToCipherOff(blockNo)
+ plainOff := f.contentEnc.BlockNoToPlainOff(blockNo)
lastBlockLen := newSize - plainOff
var data []byte
if lastBlockLen > 0 {
var status fuse.Status
data, status = f.doRead(plainOff, lastBlockLen)
if status != fuse.OK {
- cryptfs.Warn.Printf("shrink doRead returned error: %v", err)
+ toggledlog.Warn.Printf("shrink doRead returned error: %v", err)
return status
}
}
// Truncate down to last complete block
err = syscall.Ftruncate(int(f.fd.Fd()), int64(cipherOff))
if err != nil {
- cryptfs.Warn.Printf("shrink Ftruncate returned error: %v", err)
+ toggledlog.Warn.Printf("shrink Ftruncate returned error: %v", err)
return fuse.ToStatus(err)
}
// Append partial block
@@ -450,14 +452,14 @@ func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
f.fdLock.RLock()
defer f.fdLock.RUnlock()
- cryptfs.Debug.Printf("file.GetAttr()")
+ toggledlog.Debug.Printf("file.GetAttr()")
st := syscall.Stat_t{}
err := syscall.Fstat(int(f.fd.Fd()), &st)
if err != nil {
return fuse.ToStatus(err)
}
a.FromStat(&st)
- a.Size = f.cfs.CipherSizeToPlainSize(a.Size)
+ a.Size = f.contentEnc.CipherSizeToPlainSize(a.Size)
return fuse.OK
}
@@ -468,7 +470,7 @@ var allocateWarned bool
func (f *file) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
// Only warn once
if !allocateWarned {
- cryptfs.Warn.Printf("fallocate(2) is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")
+ toggledlog.Warn.Printf("fallocate(2) is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")
allocateWarned = true
}
return fuse.ENOSYS
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 16:44:57 +0000