Re-design of the original gocryptfs code to work as a library.
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libgocryptfs/tests/root_test/root_test.go

402 lines
8.5 KiB

//+build linux
// Package root_test contains tests that need root
// permissions to run
package root_test
import (
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"sync"
"syscall"
"testing"
"github.com/rfjakob/gocryptfs/v2/internal/syscallcompat"
"golang.org/x/sys/unix"
"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
)
func asUser(uid int, gid int, supplementaryGroups []int, f func() error) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
err := unix.Setgroups(supplementaryGroups)
if err != nil {
return err
}
defer func() {
err = unix.Setgroups(nil)
if err != nil {
panic(err)
}
}()
err = unix.Setregid(-1, gid)
if err != nil {
return err
}
defer func() {
err = unix.Setregid(-1, 0)
if err != nil {
panic(err)
}
}()
err = unix.Setreuid(-1, uid)
if err != nil {
return err
}
defer func() {
err = unix.Setreuid(-1, 0)
if err != nil {
panic(err)
}
}()
ret := f()
// Also reset the saved user id (suid) and saved group id (sgid) to prevent
// bizarre failures in later tests.
//
// Yes, the kernel checks that *all of them* match:
// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/fuse/dir.c?h=v5.12-rc2#n1193
//
// How to check:
// ps -o tid,pid,euid,ruid,suid,egid,rgid,sgid,cmd -eL
err = unix.Setresuid(0, 0, 0)
if err != nil {
panic(err)
}
err = unix.Setresgid(0, 0, 0)
if err != nil {
panic(err)
}
return ret
}
func TestSupplementaryGroups(t *testing.T) {
if os.Getuid() != 0 {
t.Skip("must run as root")
}
cDir := test_helpers.InitFS(t)
os.Chmod(cDir, 0755)
pDir := cDir + ".mnt"
test_helpers.MountOrFatal(t, cDir, pDir, "-allow_other", "-extpass=echo test")
defer test_helpers.UnmountPanic(pDir)
// We need an unrestricted umask
syscall.Umask(0000)
dir1 := pDir + "/dir1"
err := os.Mkdir(dir1, 0770)
if err != nil {
t.Fatal(err)
}
err = os.Chown(dir1, 0, 1234)
if err != nil {
t.Fatal(err)
}
err = asUser(1235, 1235, []int{1234}, func() error { return os.Mkdir(dir1+"/dir2", 0700) })
if err != nil {
t.Error(err)
}
err = asUser(1235, 1235, []int{1234}, func() error {
f, err := os.Create(dir1 + "/file1")
if err == nil {
f.Close()
}
return err
})
if err != nil {
t.Error(err)
}
}
func writeTillFull(t *testing.T, path string) (int, syscall.Errno) {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
fd, err := syscall.Open(path, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_TRUNC, 0600)
if err != nil {
return 0, err.(syscall.Errno)
}
defer syscall.Close(fd)
// Write in 100.000 byte-blocks, which is not aligend to the
// underlying block size
buf := make([]byte, 100000)
var sz int
for {
n, err := syscall.Write(fd, buf)
if err != nil {
return sz, err.(syscall.Errno)
}
sz += n
}
}
// TestDiskFull needs root permissions because it creates a loop disk
func TestDiskFull(t *testing.T) {
if os.Getuid() != 0 {
t.Skip("must run as root")
}
// Create 10 MB file full of zeros
ext4img := filepath.Join(test_helpers.TmpDir, t.Name()+".ext4")
f, err := os.Create(ext4img)
if err != nil {
t.Fatal(err)
}
defer f.Close()
err = f.Truncate(10 * 1024 * 1024)
if err != nil {
t.Fatal(err)
}
// Format as ext4
cmd := exec.Command("mkfs.ext4", ext4img)
out, err := cmd.CombinedOutput()
if err != nil {
t.Log(string(out))
t.Fatal(err)
}
// Mount ext4
ext4mnt := ext4img + ".mnt"
err = os.Mkdir(ext4mnt, 0600)
if err != nil {
t.Fatal(err)
}
cmd = exec.Command("mount", ext4img, ext4mnt)
out, err = cmd.CombinedOutput()
if err != nil {
t.Log(string(out))
t.Fatal(err)
}
defer syscall.Unlink(ext4img)
defer func() {
const MNT_DETACH = 2
err := syscall.Unmount(ext4mnt, MNT_DETACH)
if err != nil {
t.Log(err)
}
}()
// gocryptfs -init
cipherdir := ext4mnt + "/a"
if err = os.Mkdir(cipherdir, 0600); err != nil {
t.Fatal(err)
}
cmd = exec.Command(test_helpers.GocryptfsBinary, "-q", "-init", "-extpass", "echo test", "-scryptn=10", cipherdir)
out, err = cmd.CombinedOutput()
if err != nil {
t.Log(string(out))
t.Fatal(err)
}
// Mount gocryptfs
mnt := ext4mnt + "/b"
test_helpers.MountOrFatal(t, cipherdir, mnt, "-extpass", "echo test")
defer test_helpers.UnmountPanic(mnt)
// Write till we get ENOSPC
var err1, err2 error
var sz1, sz2 int
var wg sync.WaitGroup
wg.Add(2)
go func() {
sz1, err1 = writeTillFull(t, mnt+"/foo1")
wg.Done()
}()
go func() {
sz2, err2 = writeTillFull(t, mnt+"/foo2")
wg.Done()
}()
wg.Wait()
if err1 != syscall.ENOSPC || err2 != syscall.ENOSPC {
t.Fatalf("err1=%v, err2=%v", err1, err2)
}
t.Logf("sz1=%d, sz2=%d", sz1, sz2)
foo1, err := ioutil.ReadFile(mnt + "/foo1")
if err != nil {
t.Fatal(err)
}
if len(foo1) != sz1 {
t.Fail()
}
foo2, err := ioutil.ReadFile(mnt + "/foo2")
if err != nil {
t.Fatal(err)
}
if len(foo2) != sz2 {
t.Fail()
}
}
func TestAcl(t *testing.T) {
if os.Getuid() != 0 {
t.Skip("must run as root")
}
cDir := test_helpers.InitFS(t)
os.Chmod(cDir, 0755)
pDir := cDir + ".mnt"
test_helpers.MountOrFatal(t, cDir, pDir, "-allow_other", "-acl", "-extpass=echo test")
defer test_helpers.UnmountPanic(pDir)
f1 := pDir + "/f1"
if err := ioutil.WriteFile(f1, []byte("hello world\n"), 000); err != nil {
t.Fatal(err)
}
openUser1234 := func(rwMode int) error {
return asUser(1234, 1234, nil, func() error {
fd, err := syscall.Open(f1, rwMode, 0)
if err != nil {
return err
}
defer syscall.Close(fd)
buf := make([]byte, 100)
if rwMode == syscall.O_RDONLY || rwMode == syscall.O_RDWR {
_, err = syscall.Read(fd, buf)
if err != nil {
return err
}
}
if rwMode == syscall.O_WRONLY || rwMode == syscall.O_RDWR {
_, err = syscall.Write(fd, buf)
if err != nil {
return err
}
}
return err
})
}
dumpAcl := func() {
out, err := exec.Command("getfacl", f1).CombinedOutput()
if err != nil {
t.Fatal(err)
}
t.Log(string(out))
}
if err := openUser1234(syscall.O_RDONLY); err == nil {
t.Error("this should have failed")
dumpAcl()
}
// Allow read
out, err := exec.Command("setfacl", "-m", "u:1234:r", f1).CombinedOutput()
if err != nil {
t.Fatal(string(out))
}
if err := openUser1234(syscall.O_RDONLY); err != nil {
t.Errorf("O_RDONLY should have worked, but got error: %v", err)
dumpAcl()
}
if err := openUser1234(syscall.O_WRONLY); err == nil {
t.Error("O_WRONLY should have failed")
dumpAcl()
}
// Allow write
out, err = exec.Command("setfacl", "-m", "u:1234:w", f1).CombinedOutput()
if err != nil {
t.Fatal(string(out))
}
if err := openUser1234(syscall.O_WRONLY); err != nil {
t.Errorf("O_WRONLY should have worked, but got error: %v", err)
dumpAcl()
}
if err := openUser1234(syscall.O_RDONLY); err == nil {
t.Error("O_RDONLY should have failed")
dumpAcl()
}
}
// TestBtrfsQuirks needs root permissions because it creates a loop disk
func TestBtrfsQuirks(t *testing.T) {
if os.Getuid() != 0 {
t.Skip("must run as root")
}
img := filepath.Join(test_helpers.TmpDir, t.Name()+".img")
f, err := os.Create(img)
if err != nil {
t.Fatal(err)
}
defer f.Close()
// minimum size for each btrfs device is 114294784
err = f.Truncate(200 * 1024 * 1024)
if err != nil {
t.Fatal(err)
}
// Format as Btrfs
cmd := exec.Command("mkfs.btrfs", img)
out, err := cmd.CombinedOutput()
if err != nil {
t.Logf("%q", cmd.Args)
t.Log(string(out))
t.Fatal(err)
}
// Mount
mnt := img + ".mnt"
err = os.Mkdir(mnt, 0600)
if err != nil {
t.Fatal(err)
}
cmd = exec.Command("mount", img, mnt)
out, err = cmd.CombinedOutput()
if err != nil {
t.Log(string(out))
t.Fatal(err)
}
defer syscall.Unlink(img)
defer syscall.Unmount(mnt, 0)
quirk := syscallcompat.DetectQuirks(mnt)
if quirk != syscallcompat.QuirkBrokenFalloc {
t.Errorf("wrong quirk: %v", quirk)
}
}
func TestOverlay(t *testing.T) {
if os.Getuid() != 0 {
t.Skip("must run as root")
}
cDir := test_helpers.InitFS(t)
if syscallcompat.DetectQuirks(cDir)|syscallcompat.QuirkNoUserXattr != 0 {
t.Logf("No user xattrs! overlay mount will likely fail.")
}
os.Chmod(cDir, 0755)
pDir := cDir + ".mnt"
test_helpers.MountOrFatal(t, cDir, pDir, "-allow_other", "-extpass=echo test")
defer test_helpers.UnmountPanic(pDir)
for _, d := range []string{"lower", "upper", "work", "merged"} {
err := os.Mkdir(pDir+"/"+d, 0700)
if err != nil {
t.Fatal(err)
}
}
ovlMnt := pDir + "/merged"
cmd := exec.Command("mount", "-t", "overlay", "overlay",
"-o", "lowerdir="+pDir+"/lower,upperdir="+pDir+"/upper,workdir="+pDir+"/work",
ovlMnt)
out, err := cmd.CombinedOutput()
if err != nil {
t.Log(string(out))
t.Fatal(err)
}
defer syscall.Unmount(ovlMnt, 0)
}