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-rw-r--r--internal/fusefrontend/node.go32
-rw-r--r--internal/fusefrontend/node_helpers.go34
2 files changed, 44 insertions, 22 deletions
diff --git a/internal/fusefrontend/node.go b/internal/fusefrontend/node.go
index 9d49add..7505f92 100644
--- a/internal/fusefrontend/node.go
+++ b/internal/fusefrontend/node.go
@@ -69,7 +69,13 @@ func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (ch
if err != nil {
return nil, fs.ToErrno(err)
}
+
+ // Create new inode and fill `out`
ch = n.newChild(ctx, st, out)
+
+ // Translate ciphertext size in `out.Attr.Size` to plaintext size
+ n.translateSize(dirfd, cName, &out.Attr)
+
return ch, 0
}
@@ -98,13 +104,9 @@ func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut)
rn.inoMap.TranslateStat(st)
out.Attr.FromStat(st)
- // Fix size
- if out.IsRegular() {
- out.Size = rn.contentEnc.CipherSizeToPlainSize(out.Size)
- } else if out.IsSymlink() {
- target, _ := n.Readlink(ctx)
- out.Size = uint64(len(target))
- }
+ // Translate ciphertext size in `out.Attr.Size` to plaintext size
+ n.translateSize(dirfd, cName, &out.Attr)
+
if rn.args.ForceOwner != nil {
out.Owner = *rn.args.ForceOwner
}
@@ -221,21 +223,7 @@ func (n *Node) Readlink(ctx context.Context) (out []byte, errno syscall.Errno) {
}
defer syscall.Close(dirfd)
- cTarget, err := syscallcompat.Readlinkat(dirfd, cName)
- if err != nil {
- return nil, fs.ToErrno(err)
- }
- rn := n.rootNode()
- if rn.args.PlaintextNames {
- return []byte(cTarget), 0
- }
- // Symlinks are encrypted like file contents (GCM) and base64-encoded
- target, err := rn.decryptSymlinkTarget(cTarget)
- if err != nil {
- tlog.Warn.Printf("Readlink %q: decrypting target failed: %v", cName, err)
- return nil, syscall.EIO
- }
- return []byte(target), 0
+ return n.readlink(dirfd, cName)
}
// Open - FUSE call. Open already-existing file.
diff --git a/internal/fusefrontend/node_helpers.go b/internal/fusefrontend/node_helpers.go
index a7a32af..a31a41d 100644
--- a/internal/fusefrontend/node_helpers.go
+++ b/internal/fusefrontend/node_helpers.go
@@ -2,10 +2,14 @@ package fusefrontend
import (
"context"
+ "syscall"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
+
+ "github.com/rfjakob/gocryptfs/internal/syscallcompat"
+ "github.com/rfjakob/gocryptfs/internal/tlog"
)
// toFuseCtx tries to extract a fuse.Context from a generic context.Context.
@@ -29,3 +33,33 @@ func toNode(op fs.InodeEmbedder) *Node {
}
return op.(*Node)
}
+
+// readlink reads and decrypts a symlink. Used by Readlink, Getattr, Lookup.
+func (n *Node) readlink(dirfd int, cName string) (out []byte, errno syscall.Errno) {
+ cTarget, err := syscallcompat.Readlinkat(dirfd, cName)
+ if err != nil {
+ return nil, fs.ToErrno(err)
+ }
+ rn := n.rootNode()
+ if rn.args.PlaintextNames {
+ return []byte(cTarget), 0
+ }
+ // Symlinks are encrypted like file contents (GCM) and base64-encoded
+ target, err := rn.decryptSymlinkTarget(cTarget)
+ if err != nil {
+ tlog.Warn.Printf("Readlink %q: decrypting target failed: %v", cName, err)
+ return nil, syscall.EIO
+ }
+ return []byte(target), 0
+}
+
+// translateSize translates the ciphertext size in `out` into plaintext size.
+func (n *Node) translateSize(dirfd int, cName string, out *fuse.Attr) {
+ if out.IsRegular() {
+ rn := n.rootNode()
+ out.Size = rn.contentEnc.CipherSizeToPlainSize(out.Size)
+ } else if out.IsSymlink() {
+ target, _ := n.readlink(dirfd, cName)
+ out.Size = uint64(len(target))
+ }
+}