fusefrontend: implement path decryption via ctlsock

Closes https://github.com/rfjakob/gocryptfs/issues/84 .

1 files changed, 98 insertions, 0 deletions

diff --git a/tests/defaults/ctlsock_test.go b/tests/defaults/ctlsock_test.go
new file mode 100644
index 0000000..13e6912
--- /dev/null
+++ b/tests/defaults/ctlsock_test.go
@@ -0,0 +1,98 @@
+package defaults
+
+import (
+	"os"
+	"syscall"
+	"testing"
+
+	"github.com/rfjakob/gocryptfs/internal/ctlsock"
+	"github.com/rfjakob/gocryptfs/tests/test_helpers"
+)
+
+func TestCtlSock(t *testing.T) {
+	cDir := test_helpers.InitFS(t)
+	pDir := cDir + ".mnt"
+	sock := cDir + ".sock"
+	test_helpers.MountOrFatal(t, cDir, pDir, "-ctlsock="+sock, "-extpass", "echo test")
+	defer test_helpers.UnmountPanic(pDir)
+	req := ctlsock.RequestStruct{
+		EncryptPath: "foobar",
+	}
+	response := test_helpers.QueryCtlSock(t, sock, req)
+	if response.Result == "" || response.ErrNo != 0 {
+		t.Errorf("got an error reply: %+v", response)
+	}
+	req.EncryptPath = "not-existing-dir/xyz"
+	response = test_helpers.QueryCtlSock(t, sock, req)
+	if response.ErrNo != int32(syscall.ENOENT) || response.Result != "" {
+		t.Errorf("incorrect error handling: %+v", response)
+	}
+	// Strange paths should not cause a crash
+	crashers := []string{"/foo", "foo/", "/foo/", ".", "/////", "/../../."}
+	for _, c := range crashers {
+		req.EncryptPath = c
+		// QueryCtlSock calls t.Fatal if it gets EOF when gocryptfs panics
+		response = test_helpers.QueryCtlSock(t, sock, req)
+		if response.WarnText == "" {
+			t.Errorf("We should get a warning about non-canonical paths here")
+		}
+	}
+}
+
+func TestCtlSockDecrypt(t *testing.T) {
+	cDir := test_helpers.InitFS(t)
+	pDir := cDir + ".mnt"
+	sock := cDir + ".sock"
+	test_helpers.MountOrFatal(t, cDir, pDir, "-ctlsock="+sock, "-extpass", "echo test")
+	defer test_helpers.UnmountPanic(pDir)
+
+	paths := []string{
+		"xxxxxxx123456789",
+		"foo/bar/baz",
+		test_helpers.X255,
+		"123/" + test_helpers.X255,
+		"123/" + test_helpers.X255 + "/456",
+	}
+
+	for _, p := range paths {
+		// Create path
+		err := os.MkdirAll(pDir+"/"+p, 0700)
+		if err != nil {
+			t.Fatal(err)
+		}
+		// Encrypt the path through the ctlsock
+		req := ctlsock.RequestStruct{
+			EncryptPath: p,
+		}
+		response := test_helpers.QueryCtlSock(t, sock, req)
+		if response.Result == "" || response.ErrNo != 0 {
+			t.Fatalf("got an error reply: %+v", response)
+		}
+		// Check if the encrypted path actually exists
+		cPath := response.Result
+		_, err = os.Stat(cDir + "/" + cPath)
+		if err != nil {
+			t.Fatal(err)
+		}
+		// Decrypt the path through the ctlsock and see if we get the original path
+		req = ctlsock.RequestStruct{
+			DecryptPath: cPath,
+		}
+		response = test_helpers.QueryCtlSock(t, sock, req)
+		if response.Result == "" || response.ErrNo != 0 {
+			t.Errorf("query=%+v, response=%+v", req, response)
+			continue
+		}
+		if response.Result != p {
+			t.Errorf("want=%q got=%q", p, response.Result)
+		}
+	}
+}
+
+func TestCtlSockDecryptCrash(t *testing.T) {
+	cDir := test_helpers.InitFS(t)
+	pDir := cDir + ".mnt"
+	sock := cDir + ".sock"
+	test_helpers.MountOrFatal(t, cDir, pDir, "-ctlsock="+sock, "-extpass", "echo test")
+	defer test_helpers.UnmountPanic(pDir)
+}