72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
package fusefrontend
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// This file forwards file encryption operations to cryptfs
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import (
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"path/filepath"
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"github.com/rfjakob/gocryptfs/internal/configfile"
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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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// isFiltered - check if plaintext "path" should be forbidden
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//
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// Prevents name clashes with internal files when file names are not encrypted
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func (fs *FS) isFiltered(path string) bool {
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if !fs.args.PlaintextNames {
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return false
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}
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// gocryptfs.conf in the root directory is forbidden
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if path == configfile.ConfDefaultName {
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tlog.Info.Printf("The name /%s is reserved when -plaintextnames is used\n",
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configfile.ConfDefaultName)
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return true
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}
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// Note: gocryptfs.diriv is NOT forbidden because diriv and plaintextnames
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// are exclusive
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return false
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}
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// GetBackingPath - get the absolute encrypted path of the backing file
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// from the relative plaintext path "relPath"
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func (fs *FS) getBackingPath(relPath string) (string, error) {
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cPath, err := fs.encryptPath(relPath)
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if err != nil {
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return "", err
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}
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cAbsPath := filepath.Join(fs.args.Cipherdir, cPath)
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tlog.Debug.Printf("getBackingPath: %s + %s -> %s", fs.args.Cipherdir, relPath, cAbsPath)
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return cAbsPath, nil
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}
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// openBackingDir opens the parent ciphertext directory of plaintext path
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// "relPath" and returns the dirfd and the encrypted basename.
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// The caller should then use Openat(dirfd, cName, ...) and friends.
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// openBackingDir is secure against symlink races.
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func (fs *FS) openBackingDir(relPath string) (dirfd int, cName string, err error) {
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cRelPath, err := fs.encryptPath(relPath)
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if err != nil {
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return -1, "", err
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}
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// Open parent dir
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dirfd, err = syscallcompat.OpenDirNofollow(fs.args.Cipherdir, filepath.Dir(cRelPath))
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if err != nil {
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return -1, "", err
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}
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cName = filepath.Base(cRelPath)
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return dirfd, cName, nil
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}
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// encryptPath - encrypt relative plaintext path
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func (fs *FS) encryptPath(plainPath string) (string, error) {
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if fs.args.PlaintextNames {
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return plainPath, nil
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}
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fs.dirIVLock.RLock()
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cPath, err := fs.nameTransform.EncryptPathDirIV(plainPath, fs.args.Cipherdir)
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tlog.Debug.Printf("encryptPath '%s' -> '%s' (err: %v)", plainPath, cPath, err)
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fs.dirIVLock.RUnlock()
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return cPath, err
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}
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