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-rw-r--r--README.md5
-rw-r--r--internal/nametransform/diriv.go10
-rw-r--r--tests/cli/cli_test.go20
3 files changed, 34 insertions, 1 deletions
diff --git a/README.md b/README.md
index 0f757eb..7614496 100644
--- a/README.md
+++ b/README.md
@@ -166,6 +166,11 @@ Changelog
vNEXT, in progress
* Support wild cards in reverse mode via `--exclude-wildcard`
([#367](https://github.com/rfjakob/gocryptfs/pull/367)). Thanks @ekalin!
+* Create `gocryptfs.diriv` files with 0440 permissions to make it easier to
+ share an encrypted folder via a network drive
+ ([#387](https://github.com/rfjakob/gocryptfs/issues/387)).
+ Note: as a security precaution, the owner must still manually
+ `chmod gocryptfs.conf 0440` to allow mounting.
v1.7, 2019-03-17
* **Fix possible symlink race attacks in forward mode** when using allow_other + plaintextnames
diff --git a/internal/nametransform/diriv.go b/internal/nametransform/diriv.go
index da33aee..c216dd0 100644
--- a/internal/nametransform/diriv.go
+++ b/internal/nametransform/diriv.go
@@ -61,11 +61,19 @@ func fdReadDirIV(fd *os.File) (iv []byte, err error) {
// This function is exported because it is used from fusefrontend, main,
// and also the automated tests.
func WriteDirIVAt(dirfd int) error {
+ // It makes sense to have the diriv files group-readable so the FS can
+ // be mounted from several users from a network drive (see
+ // https://github.com/rfjakob/gocryptfs/issues/387 ).
+ //
+ // Note that gocryptfs.conf is still created with 0400 permissions so the
+ // owner must explicitely chmod it to permit access.
+ const dirivPerms = 0440
+
iv := cryptocore.RandBytes(DirIVLen)
// 0400 permissions: gocryptfs.diriv should never be modified after creation.
// Don't use "ioutil.WriteFile", it causes trouble on NFS:
// https://github.com/rfjakob/gocryptfs/commit/7d38f80a78644c8ec4900cc990bfb894387112ed
- fd, err := syscallcompat.Openat(dirfd, DirIVFilename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0400)
+ fd, err := syscallcompat.Openat(dirfd, DirIVFilename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, dirivPerms)
if err != nil {
tlog.Warn.Printf("WriteDirIV: Openat: %v", err)
return err
diff --git a/tests/cli/cli_test.go b/tests/cli/cli_test.go
index 48ce303..438ba16 100644
--- a/tests/cli/cli_test.go
+++ b/tests/cli/cli_test.go
@@ -43,6 +43,26 @@ func TestInit(t *testing.T) {
}
}
+// Test that gocryptfs.conf and gocryptfs.diriv are there with the expected
+// permissions after -init
+func TestInitFilePerms(t *testing.T) {
+ dir := test_helpers.InitFS(t)
+ var st syscall.Stat_t
+ syscall.Stat(dir+"/gocryptfs.conf", &st)
+ perms := st.Mode & 0777
+ if perms != 0400 {
+ t.Errorf("Wrong permissions for gocryptfs.conf: %#o", perms)
+ }
+ st = syscall.Stat_t{}
+ syscall.Stat(dir+"/gocryptfs.diriv", &st)
+ perms = st.Mode & 0777
+ // From v1.7.1, these are created with 0440 permissions, see
+ // https://github.com/rfjakob/gocryptfs/issues/387
+ if perms != 0440 {
+ t.Errorf("Wrong permissions for gocryptfs.diriv: %#o", perms)
+ }
+}
+
// Test -init with -devrandom flag
func TestInitDevRandom(t *testing.T) {
test_helpers.InitFS(t, "-devrandom")