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Diffstat (limited to 'pathfs_frontend')
-rw-r--r--pathfs_frontend/fs.go156
-rw-r--r--pathfs_frontend/names.go11
2 files changed, 125 insertions, 42 deletions
diff --git a/pathfs_frontend/fs.go b/pathfs_frontend/fs.go
index 9c809df..48ea4a2 100644
--- a/pathfs_frontend/fs.go
+++ b/pathfs_frontend/fs.go
@@ -1,6 +1,7 @@
package pathfs_frontend
import (
+ "encoding/base64"
"fmt"
"sync"
"syscall"
@@ -17,9 +18,9 @@ import (
type FS struct {
*cryptfs.CryptFS
- pathfs.FileSystem // loopbackFileSystem, see go-fuse/fuse/pathfs/loopback.go
- backing string // Backing directory
- dirivLock sync.RWMutex // Global lock that is taken if any "gocryptfs.diriv" file is modified
+ pathfs.FileSystem // loopbackFileSystem, see go-fuse/fuse/pathfs/loopback.go
+ backingDir string // Backing directory, cipherdir
+ dirivLock sync.RWMutex // Global lock that is taken if any "gocryptfs.diriv" file is modified
}
// Encrypted FUSE overlay filesystem
@@ -27,14 +28,18 @@ func NewFS(key []byte, backing string, useOpenssl bool, plaintextNames bool) *FS
return &FS{
CryptFS: cryptfs.NewCryptFS(key, useOpenssl, plaintextNames),
FileSystem: pathfs.NewLoopbackFileSystem(backing),
- backing: backing,
+ backingDir: backing,
}
}
-// GetPath - get the absolute encrypted path of the backing file
+// GetBackingPath - get the absolute encrypted path of the backing file
// from the relative plaintext path "relPath"
-func (fs *FS) GetPath(relPath string) string {
- return filepath.Join(fs.backing, fs.EncryptPath(relPath))
+func (fs *FS) getBackingPath(relPath string) (string, error) {
+ encrypted, err := fs.encryptPath(relPath)
+ if err != nil {
+ return "", err
+ }
+ return filepath.Join(fs.backingDir, encrypted), nil
}
func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
@@ -42,7 +47,10 @@ func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Stat
if fs.CryptFS.IsFiltered(name) {
return nil, fuse.EPERM
}
- cName := fs.EncryptPath(name)
+ cName, err := fs.encryptPath(name)
+ if err != nil {
+ return nil, fuse.ToStatus(err)
+ }
a, status := fs.FileSystem.GetAttr(cName, context)
if a == nil {
cryptfs.Debug.Printf("FS.GetAttr failed: %s\n", status.String())
@@ -59,7 +67,11 @@ 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)\n", dirName)
- cipherEntries, status := fs.FileSystem.OpenDir(fs.EncryptPath(dirName), context)
+ cDirName, err := fs.encryptPath(dirName)
+ if err != nil {
+ return nil, fuse.ToStatus(err)
+ }
+ cipherEntries, status := fs.FileSystem.OpenDir(cDirName, context)
var plain []fuse.DirEntry
if cipherEntries != nil {
for i := range cipherEntries {
@@ -72,7 +84,7 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
// silently ignore "gocryptfs.diriv" everywhere
continue
}
- name, err := fs.DecryptPath(cName)
+ name, err := fs.decryptPath(cName)
if err != nil {
cryptfs.Warn.Printf("Invalid name \"%s\" in dir \"%s\": %s\n", cName, dirName, err)
continue
@@ -103,7 +115,11 @@ func (fs *FS) Open(path string, flags uint32, context *fuse.Context) (fuseFile n
return nil, fuse.EPERM
}
iflags, writeOnly := fs.mangleOpenFlags(flags)
- f, err := os.OpenFile(fs.GetPath(path), iflags, 0666)
+ cPath, err := fs.getBackingPath(path)
+ if err != nil {
+ return nil, fuse.ToStatus(err)
+ }
+ f, err := os.OpenFile(cPath, iflags, 0666)
if err != nil {
return nil, fuse.ToStatus(err)
}
@@ -116,7 +132,11 @@ func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Conte
return nil, fuse.EPERM
}
iflags, writeOnly := fs.mangleOpenFlags(flags)
- f, err := os.OpenFile(fs.GetPath(path), iflags|os.O_CREATE, os.FileMode(mode))
+ cPath, err := fs.getBackingPath(path)
+ if err != nil {
+ return nil, fuse.ToStatus(err)
+ }
+ f, err := os.OpenFile(cPath, iflags|os.O_CREATE, os.FileMode(mode))
if err != nil {
return nil, fuse.ToStatus(err)
}
@@ -127,21 +147,33 @@ func (fs *FS) Chmod(path string, mode uint32, context *fuse.Context) (code fuse.
if fs.CryptFS.IsFiltered(path) {
return fuse.EPERM
}
- return fs.FileSystem.Chmod(fs.EncryptPath(path), mode, context)
+ cPath, err := fs.encryptPath(path)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ return fs.FileSystem.Chmod(cPath, mode, context)
}
func (fs *FS) Chown(path string, uid uint32, gid uint32, context *fuse.Context) (code fuse.Status) {
if fs.CryptFS.IsFiltered(path) {
return fuse.EPERM
}
- return fs.FileSystem.Chown(fs.EncryptPath(path), uid, gid, context)
+ cPath, err := fs.encryptPath(path)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ return fs.FileSystem.Chown(cPath, uid, gid, context)
}
-func (fs *FS) Mknod(name string, mode uint32, dev uint32, context *fuse.Context) (code fuse.Status) {
- if fs.CryptFS.IsFiltered(name) {
+func (fs *FS) Mknod(path string, mode uint32, dev uint32, context *fuse.Context) (code fuse.Status) {
+ if fs.CryptFS.IsFiltered(path) {
return fuse.EPERM
}
- return fs.FileSystem.Mknod(fs.EncryptPath(name), mode, dev, context)
+ cPath, err := fs.encryptPath(path)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ return fs.FileSystem.Mknod(cPath, mode, dev, context)
}
func (fs *FS) Truncate(path string, offset uint64, context *fuse.Context) (code fuse.Status) {
@@ -153,15 +185,23 @@ func (fs *FS) Utimens(path string, Atime *time.Time, Mtime *time.Time, context *
if fs.CryptFS.IsFiltered(path) {
return fuse.EPERM
}
- return fs.FileSystem.Utimens(fs.EncryptPath(path), Atime, Mtime, context)
+ cPath, err := fs.encryptPath(path)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ return fs.FileSystem.Utimens(cPath, Atime, Mtime, context)
}
-func (fs *FS) Readlink(name string, context *fuse.Context) (out string, status fuse.Status) {
- dst, status := fs.FileSystem.Readlink(fs.EncryptPath(name), context)
+func (fs *FS) Readlink(path string, context *fuse.Context) (out string, status fuse.Status) {
+ cPath, err := fs.encryptPath(path)
+ if err != nil {
+ return "", fuse.ToStatus(err)
+ }
+ dst, status := fs.FileSystem.Readlink(cPath, context)
if status != fuse.OK {
return "", status
}
- dstPlain, err := fs.DecryptPath(dst)
+ dstPlain, err := fs.decryptPath(dst)
if err != nil {
cryptfs.Warn.Printf("Failed decrypting symlink: %s\n", err.Error())
return "", fuse.EIO
@@ -173,11 +213,14 @@ func (fs *FS) Mkdir(relPath string, mode uint32, context *fuse.Context) (code fu
if fs.CryptFS.IsFiltered(relPath) {
return fuse.EPERM
}
- encPath := fs.GetPath(relPath)
+ encPath, err := fs.getBackingPath(relPath)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
diriv := cryptfs.RandBytes(cryptfs.DIRIV_LEN)
dirivPath := filepath.Join(encPath, cryptfs.DIRIV_FILENAME)
// Create directory
- err := os.Mkdir(encPath, os.FileMode(mode))
+ err = os.Mkdir(encPath, os.FileMode(mode))
if err != nil {
return fuse.ToStatus(err)
}
@@ -196,20 +239,22 @@ func (fs *FS) Mkdir(relPath string, mode uint32, context *fuse.Context) (code fu
return fuse.OK
}
-func (fs *FS) Unlink(name string, context *fuse.Context) (code fuse.Status) {
- if fs.CryptFS.IsFiltered(name) {
+func (fs *FS) Unlink(path string, context *fuse.Context) (code fuse.Status) {
+ if fs.CryptFS.IsFiltered(path) {
return fuse.EPERM
}
- cName := fs.EncryptPath(name)
- code = fs.FileSystem.Unlink(cName, context)
- if code != fuse.OK {
- cryptfs.Debug.Printf("Unlink failed on %s [%s], code=%s\n", name, cName, code.String())
+ cPath, err := fs.getBackingPath(path)
+ if err != nil {
+ return fuse.ToStatus(err)
}
- return code
+ return fuse.ToStatus(syscall.Unlink(cPath))
}
func (fs *FS) Rmdir(name string, context *fuse.Context) (code fuse.Status) {
- encPath := fs.GetPath(name)
+ encPath, err := fs.getBackingPath(name)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
// If the directory is not empty besides gocryptfs.diriv, do not even
// attempt the dance around gocryptfs.diriv.
@@ -264,34 +309,61 @@ func (fs *FS) Rmdir(name string, context *fuse.Context) (code fuse.Status) {
return fuse.OK
}
-func (fs *FS) Symlink(pointedTo string, linkName 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\")\n", target, linkName)
if fs.CryptFS.IsFiltered(linkName) {
return fuse.EPERM
}
- // TODO symlink encryption
- cryptfs.Debug.Printf("Symlink(\"%s\", \"%s\")\n", pointedTo, linkName)
- return fs.FileSystem.Symlink(fs.EncryptPath(pointedTo), fs.EncryptPath(linkName), context)
+ cName, err := fs.encryptPath(linkName)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+
+ cBinTarget := fs.CryptFS.EncryptBlock([]byte(target), 0, nil)
+ cTarget := base64.URLEncoding.EncodeToString(cBinTarget)
+
+ return fuse.ToStatus(os.Symlink(cTarget, cName))
}
func (fs *FS) Rename(oldPath string, newPath string, context *fuse.Context) (code fuse.Status) {
if fs.CryptFS.IsFiltered(newPath) {
return fuse.EPERM
}
- return fs.FileSystem.Rename(fs.EncryptPath(oldPath), fs.EncryptPath(newPath), context)
+ cOldPath, err := fs.getBackingPath(oldPath)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ cNewPath, err := fs.getBackingPath(newPath)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ return fs.FileSystem.Rename(cOldPath, cNewPath, context)
}
-func (fs *FS) Link(orig string, newName string, context *fuse.Context) (code fuse.Status) {
- if fs.CryptFS.IsFiltered(newName) {
+func (fs *FS) Link(oldPath string, newPath string, context *fuse.Context) (code fuse.Status) {
+ if fs.CryptFS.IsFiltered(newPath) {
return fuse.EPERM
}
- return fs.FileSystem.Link(fs.EncryptPath(orig), fs.EncryptPath(newName), context)
+ cOldPath, err := fs.getBackingPath(oldPath)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ cNewPath, err := fs.getBackingPath(newPath)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ return fuse.ToStatus(os.Link(cOldPath, cNewPath))
}
-func (fs *FS) Access(name string, mode uint32, context *fuse.Context) (code fuse.Status) {
- if fs.CryptFS.IsFiltered(name) {
+func (fs *FS) Access(path string, mode uint32, context *fuse.Context) (code fuse.Status) {
+ if fs.CryptFS.IsFiltered(path) {
return fuse.EPERM
}
- return fs.FileSystem.Access(fs.EncryptPath(name), mode, context)
+ cPath, err := fs.getBackingPath(path)
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ return fuse.ToStatus(syscall.Access(cPath, mode))
}
func (fs *FS) GetXAttr(name string, attr string, context *fuse.Context) ([]byte, fuse.Status) {
diff --git a/pathfs_frontend/names.go b/pathfs_frontend/names.go
new file mode 100644
index 0000000..5842d83
--- /dev/null
+++ b/pathfs_frontend/names.go
@@ -0,0 +1,11 @@
+package pathfs_frontend
+
+// This file handles filename encryption
+
+func (fs *FS) encryptPath(plainPath string) (string, error) {
+ return fs.CryptFS.EncryptPathDirIV(plainPath, fs.backingDir)
+}
+
+func (fs *FS) decryptPath(cipherPath string) (string, error) {
+ return fs.CryptFS.DecryptPathDirIV(cipherPath, fs.backingDir)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 06:01:03 +0000