aboutsummaryrefslogtreecommitdiff
path: root/pathfs_frontend/fs.go
diff options
context:
space:
mode:
Diffstat (limited to 'pathfs_frontend/fs.go')
-rw-r--r--pathfs_frontend/fs.go76
1 files changed, 46 insertions, 30 deletions
diff --git a/pathfs_frontend/fs.go b/pathfs_frontend/fs.go
index a00985d..212f0a7 100644
--- a/pathfs_frontend/fs.go
+++ b/pathfs_frontend/fs.go
@@ -13,25 +13,41 @@ import (
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/hanwen/go-fuse/fuse/pathfs"
- "github.com/rfjakob/gocryptfs/cryptfs"
+
+ "github.com/rfjakob/gocryptfs/internal/toggledlog"
+ "github.com/rfjakob/gocryptfs/internal/cryptocore"
+ "github.com/rfjakob/gocryptfs/internal/nametransform"
+ "github.com/rfjakob/gocryptfs/internal/contentenc"
+ "github.com/rfjakob/gocryptfs/internal/configfile"
)
+const plainBS = 4096
+
type FS struct {
- *cryptfs.CryptFS
pathfs.FileSystem // loopbackFileSystem, see go-fuse/fuse/pathfs/loopback.go
args Args // Stores configuration arguments
// dirIVLock: Lock()ed if any "gocryptfs.diriv" file is modified
// Readers must RLock() it to prevent them from seeing intermediate
// states
dirIVLock sync.RWMutex
+ // Filename encryption helper
+ nameTransform *nametransform.NameTransform
+ // Content encryption helper
+ contentEnc *contentenc.ContentEnc
}
// Encrypted FUSE overlay filesystem
func NewFS(args Args) *FS {
+
+ cryptoCore := cryptocore.New(args.Masterkey, args.OpenSSL, args.GCMIV128)
+ contentEnc := contentenc.New(cryptoCore, plainBS)
+ nameTransform := nametransform.New(cryptoCore, args.EMENames)
+
return &FS{
- CryptFS: cryptfs.NewCryptFS(args.Masterkey, args.OpenSSL, args.PlaintextNames, args.GCMIV128),
FileSystem: pathfs.NewLoopbackFileSystem(args.Cipherdir),
args: args,
+ nameTransform: nameTransform,
+ contentEnc: contentEnc,
}
}
@@ -43,12 +59,12 @@ func (fs *FS) getBackingPath(relPath string) (string, error) {
return "", err
}
cAbsPath := filepath.Join(fs.args.Cipherdir, cPath)
- cryptfs.Debug.Printf("getBackingPath: %s + %s -> %s", fs.args.Cipherdir, relPath, cAbsPath)
+ toggledlog.Debug.Printf("getBackingPath: %s + %s -> %s", fs.args.Cipherdir, relPath, cAbsPath)
return cAbsPath, nil
}
func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
- cryptfs.Debug.Printf("FS.GetAttr('%s')", name)
+ toggledlog.Debug.Printf("FS.GetAttr('%s')", name)
if fs.isFiltered(name) {
return nil, fuse.EPERM
}
@@ -58,11 +74,11 @@ func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Stat
}
a, status := fs.FileSystem.GetAttr(cName, context)
if a == nil {
- cryptfs.Debug.Printf("FS.GetAttr failed: %s", status.String())
+ toggledlog.Debug.Printf("FS.GetAttr failed: %s", status.String())
return a, status
}
if a.IsRegular() {
- a.Size = fs.CipherSizeToPlainSize(a.Size)
+ a.Size = fs.contentEnc.CipherSizeToPlainSize(a.Size)
} else if a.IsSymlink() {
target, _ := fs.Readlink(name, context)
a.Size = uint64(len(target))
@@ -71,7 +87,7 @@ func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Stat
}
func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, fuse.Status) {
- cryptfs.Debug.Printf("OpenDir(%s)", dirName)
+ toggledlog.Debug.Printf("OpenDir(%s)", dirName)
cDirName, err := fs.encryptPath(dirName)
if err != nil {
return nil, fuse.ToStatus(err)
@@ -81,12 +97,12 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
if cipherEntries == nil {
return nil, status
}
- // Get DirIV (stays zero if DirIV if off)
- cachedIV := make([]byte, cryptfs.DIRIV_LEN)
+ // Get DirIV (stays nil if DirIV if off)
+ var cachedIV []byte
if fs.args.DirIV {
// Read the DirIV once and use it for all later name decryptions
cDirAbsPath := filepath.Join(fs.args.Cipherdir, cDirName)
- cachedIV, err = fs.CryptFS.ReadDirIV(cDirAbsPath)
+ cachedIV, err = fs.nameTransform.ReadDirIV(cDirAbsPath)
if err != nil {
return nil, fuse.ToStatus(err)
}
@@ -95,19 +111,19 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
var plain []fuse.DirEntry
for i := range cipherEntries {
cName := cipherEntries[i].Name
- if dirName == "" && cName == cryptfs.ConfDefaultName {
+ if dirName == "" && cName == configfile.ConfDefaultName {
// silently ignore "gocryptfs.conf" in the top level dir
continue
}
- if fs.args.DirIV && cName == cryptfs.DIRIV_FILENAME {
+ if fs.args.DirIV && cName == nametransform.DirIVFilename {
// silently ignore "gocryptfs.diriv" everywhere if dirIV is enabled
continue
}
var name string = cName
if !fs.args.PlaintextNames {
- name, err = fs.CryptFS.DecryptName(cName, cachedIV, fs.args.EMENames)
+ name, err = fs.nameTransform.DecryptName(cName, cachedIV)
if err != nil {
- cryptfs.Warn.Printf("Invalid name \"%s\" in dir \"%s\": %s", cName, cDirName, err)
+ toggledlog.Warn.Printf("Invalid name \"%s\" in dir \"%s\": %s", cName, cDirName, err)
continue
}
}
@@ -137,16 +153,16 @@ func (fs *FS) Open(path string, flags uint32, context *fuse.Context) (fuseFile n
iflags, writeOnly := fs.mangleOpenFlags(flags)
cPath, err := fs.getBackingPath(path)
if err != nil {
- cryptfs.Debug.Printf("Open: getBackingPath: %v", err)
+ toggledlog.Debug.Printf("Open: getBackingPath: %v", err)
return nil, fuse.ToStatus(err)
}
- cryptfs.Debug.Printf("Open: %s", cPath)
+ toggledlog.Debug.Printf("Open: %s", cPath)
f, err := os.OpenFile(cPath, iflags, 0666)
if err != nil {
return nil, fuse.ToStatus(err)
}
- return NewFile(f, writeOnly, fs.CryptFS), fuse.OK
+ return NewFile(f, writeOnly, fs.contentEnc), fuse.OK
}
func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Context) (fuseFile nodefs.File, code fuse.Status) {
@@ -162,7 +178,7 @@ func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Conte
if err != nil {
return nil, fuse.ToStatus(err)
}
- return NewFile(f, writeOnly, fs.CryptFS), fuse.OK
+ return NewFile(f, writeOnly, fs.contentEnc), fuse.OK
}
func (fs *FS) Chmod(path string, mode uint32, context *fuse.Context) (code fuse.Status) {
@@ -203,7 +219,7 @@ var truncateWarned bool
func (fs *FS) Truncate(path string, offset uint64, context *fuse.Context) (code fuse.Status) {
// Only warn once
if !truncateWarned {
- cryptfs.Warn.Printf("truncate(2) is not supported, returning ENOSYS - use ftruncate(2)")
+ toggledlog.Warn.Printf("truncate(2) is not supported, returning ENOSYS - use ftruncate(2)")
truncateWarned = true
}
return fuse.ENOSYS
@@ -233,7 +249,7 @@ func (fs *FS) Readlink(path string, context *fuse.Context) (out string, status f
if !fs.args.DirIV {
target, err := fs.decryptPath(cTarget)
if err != nil {
- cryptfs.Warn.Printf("Readlink: CBC decryption failed: %v", err)
+ toggledlog.Warn.Printf("Readlink: CBC decryption failed: %v", err)
return "", fuse.EIO
}
return target, fuse.OK
@@ -241,12 +257,12 @@ func (fs *FS) Readlink(path string, context *fuse.Context) (out string, status f
// Since gocryptfs v0.5 symlinks are encrypted like file contents (GCM)
cBinTarget, err := base64.URLEncoding.DecodeString(cTarget)
if err != nil {
- cryptfs.Warn.Printf("Readlink: %v", err)
+ toggledlog.Warn.Printf("Readlink: %v", err)
return "", fuse.EIO
}
- target, err := fs.CryptFS.DecryptBlock([]byte(cBinTarget), 0, nil)
+ target, err := fs.contentEnc.DecryptBlock([]byte(cBinTarget), 0, nil)
if err != nil {
- cryptfs.Warn.Printf("Readlink: %v", err)
+ toggledlog.Warn.Printf("Readlink: %v", err)
return "", fuse.EIO
}
return string(target), fuse.OK
@@ -264,7 +280,7 @@ func (fs *FS) Unlink(path string, context *fuse.Context) (code fuse.Status) {
}
func (fs *FS) Symlink(target string, linkName string, context *fuse.Context) (code fuse.Status) {
- cryptfs.Debug.Printf("Symlink(\"%s\", \"%s\")", target, linkName)
+ toggledlog.Debug.Printf("Symlink(\"%s\", \"%s\")", target, linkName)
if fs.isFiltered(linkName) {
return fuse.EPERM
}
@@ -276,18 +292,18 @@ func (fs *FS) Symlink(target string, linkName string, context *fuse.Context) (co
if !fs.args.DirIV {
cTarget, err := fs.encryptPath(target)
if err != nil {
- cryptfs.Warn.Printf("Symlink: BUG: we should not get an error here: %v", err)
+ toggledlog.Warn.Printf("Symlink: BUG: we should not get an error here: %v", err)
return fuse.ToStatus(err)
}
err = os.Symlink(cTarget, cPath)
return fuse.ToStatus(err)
}
// Since gocryptfs v0.5 symlinks are encrypted like file contents (GCM)
- cBinTarget := fs.CryptFS.EncryptBlock([]byte(target), 0, nil)
+ cBinTarget := fs.contentEnc.EncryptBlock([]byte(target), 0, nil)
cTarget := base64.URLEncoding.EncodeToString(cBinTarget)
err = os.Symlink(cTarget, cPath)
- cryptfs.Debug.Printf("Symlink: os.Symlink(%s, %s) = %v", cTarget, cPath, err)
+ toggledlog.Debug.Printf("Symlink: os.Symlink(%s, %s) = %v", cTarget, cPath, err)
return fuse.ToStatus(err)
}
@@ -305,7 +321,7 @@ func (fs *FS) Rename(oldPath string, newPath string, context *fuse.Context) (cod
}
// The Rename may cause a directory to take the place of another directory.
// That directory may still be in the DirIV cache, clear it.
- fs.CryptFS.DirIVCache.Clear()
+ fs.nameTransform.DirIVCache.Clear()
err = os.Rename(cOldPath, cNewPath)
@@ -313,7 +329,7 @@ func (fs *FS) Rename(oldPath string, newPath string, context *fuse.Context) (cod
// If an empty directory is overwritten we will always get
// ENOTEMPTY as the "empty" directory will still contain gocryptfs.diriv.
// Handle that case by removing the target directory and trying again.
- cryptfs.Debug.Printf("Rename: Handling ENOTEMPTY")
+ toggledlog.Debug.Printf("Rename: Handling ENOTEMPTY")
if fs.Rmdir(newPath, context) == fuse.OK {
err = os.Rename(cOldPath, cNewPath)
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 15:43:34 +0000