87d3ed9187
Even though filesystem notifications aren't implemented for FUSE, I decided to try my hand at implementing the autounmount feature (#128). I based it on the EncFS autounmount code, which records filesystem accesses and checks every X seconds whether it's idled long enough to unmount. I've tested the feature locally, but I haven't added any tests for this flag. I also haven't worked with Go before. So please let me know if there's anything that should be done differently. One particular concern: I worked from the assumption that the open files table is unique per-filesystem. If that's not true, I'll need to add an open file count and associated lock to the Filesystem type instead. https://github.com/rfjakob/gocryptfs/pull/265
78 lines
2.4 KiB
Go
78 lines
2.4 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 plainPath != "" { // Empty path gets encrypted all the time without actual file accesses.
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fs.AccessedSinceLastCheck = 1
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} else { // Empty string gets encrypted as empty string
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return plainPath, nil
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}
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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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