111 lines
3.3 KiB
Go
111 lines
3.3 KiB
Go
package fusefrontend_reverse
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import (
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"context"
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"fmt"
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"syscall"
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"golang.org/x/sys/unix"
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"github.com/hanwen/go-fuse/v2/fs"
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"github.com/hanwen/go-fuse/v2/fuse"
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"github.com/rfjakob/gocryptfs/internal/configfile"
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"github.com/rfjakob/gocryptfs/internal/cryptocore"
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"github.com/rfjakob/gocryptfs/internal/nametransform"
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"github.com/rfjakob/gocryptfs/internal/pathiv"
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"github.com/rfjakob/gocryptfs/internal/syscallcompat"
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"github.com/rfjakob/gocryptfs/internal/tlog"
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)
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// Readdir - FUSE call.
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//
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// This function is symlink-safe through use of openBackingDir() and
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// ReadDirIVAt().
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func (n *Node) Readdir(ctx context.Context) (stream fs.DirStream, errno syscall.Errno) {
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d, errno := n.prepareAtSyscall("")
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if errno != 0 {
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return
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}
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defer syscall.Close(d.dirfd)
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// Read plaintext directory
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var entries []fuse.DirEntry
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fd, err := syscallcompat.Openat(d.dirfd, d.pName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
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if err != nil {
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return nil, fs.ToErrno(err)
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}
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defer syscall.Close(fd)
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entries, err = syscallcompat.Getdents(fd)
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if err != nil {
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return nil, fs.ToErrno(err)
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}
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rn := n.rootNode()
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// Filter out excluded entries
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entries = rn.excludeDirEntries(d, entries)
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if rn.args.PlaintextNames {
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return n.readdirPlaintextnames(entries)
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}
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// Virtual files: at least one gocryptfs.diriv file
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virtualFiles := []fuse.DirEntry{
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{Mode: virtualFileMode, Name: nametransform.DirIVFilename},
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}
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dirIV := pathiv.Derive(d.cPath, pathiv.PurposeDirIV)
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// Encrypt names
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for i := range entries {
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var cName string
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// ".gocryptfs.reverse.conf" in the root directory is mapped to "gocryptfs.conf"
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if n.isRoot() && entries[i].Name == configfile.ConfReverseName &&
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!rn.args.ConfigCustom {
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cName = configfile.ConfDefaultName
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} else {
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cName = rn.nameTransform.EncryptName(entries[i].Name, dirIV)
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if len(cName) > unix.NAME_MAX {
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cName = rn.nameTransform.HashLongName(cName)
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dotNameFile := fuse.DirEntry{
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Mode: virtualFileMode,
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Name: cName + nametransform.LongNameSuffix,
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}
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virtualFiles = append(virtualFiles, dotNameFile)
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}
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}
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entries[i].Name = cName
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}
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// Add virtual files
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entries = append(entries, virtualFiles...)
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return fs.NewListDirStream(entries), 0
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}
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func (n *Node) readdirPlaintextnames(entries []fuse.DirEntry) (stream fs.DirStream, errno syscall.Errno) {
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rn := n.rootNode()
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// If we are not the root dir or a custom config path was used, we don't
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// need to map anything
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if !n.isRoot() || rn.args.ConfigCustom {
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return fs.NewListDirStream(entries), 0
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}
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// We are in the root dir and the default config file name
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// ".gocryptfs.reverse.conf" is used. We map it to "gocryptfs.conf".
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dupe := -1
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for i := range entries {
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if entries[i].Name == configfile.ConfReverseName {
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entries[i].Name = configfile.ConfDefaultName
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} else if entries[i].Name == configfile.ConfDefaultName {
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dupe = i
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}
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}
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if dupe >= 0 {
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// Warn the user loudly: The gocryptfs.conf_NAME_COLLISION file will
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// throw ENOENT errors that are hard to miss.
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tlog.Warn.Printf("The file %q is mapped to %q and shadows another file. Please rename %q in directory %q.",
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configfile.ConfReverseName, configfile.ConfDefaultName, configfile.ConfDefaultName, rn.args.Cipherdir)
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entries[dupe].Name = "gocryptfs.conf_NAME_COLLISION_" + fmt.Sprintf("%d", cryptocore.RandUint64())
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}
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return fs.NewListDirStream(entries), 0
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}
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