diff options
Diffstat (limited to 'test/sandbox/assert.go')
| -rw-r--r-- | test/sandbox/assert.go | 272 |
1 files changed, 0 insertions, 272 deletions
diff --git a/test/sandbox/assert.go b/test/sandbox/assert.go deleted file mode 100644 index 82c928b0..00000000 --- a/test/sandbox/assert.go +++ /dev/null @@ -1,272 +0,0 @@ -//go:build testtool - -/* -Package sandbox provides utilities for checking sandbox outcome. - -This package must never be used outside integration tests, there is a much better native implementation of mountinfo -in the public sandbox/vfs package. Files in this package are excluded by the build system to prevent accidental misuse. -*/ -package sandbox - -import ( - "crypto/sha512" - "encoding/hex" - "encoding/json" - "errors" - "io/fs" - "log" - "net" - "os" - "path" - "syscall" -) - -var ( - assert = log.New(os.Stderr, "sandbox: ", 0) - printfFunc = assert.Printf - fatalfFunc = assert.Fatalf -) - -func printf(format string, v ...any) { printfFunc(format, v...) } -func fatalf(format string, v ...any) { fatalfFunc(format, v...) } - -type TestCase struct { - Env []string `json:"env"` - FS *FS `json:"fs"` - Mount []*MountinfoEntry `json:"mount"` - Seccomp bool `json:"seccomp"` - - TrySocket string `json:"try_socket,omitempty"` - SocketAbstract bool `json:"socket_abstract,omitempty"` - SocketPathname bool `json:"socket_pathname,omitempty"` -} - -type T struct { - FS fs.FS - - MountsPath string -} - -func (t *T) MustCheckFile(wantFilePath string) { - var want *TestCase - mustDecode(wantFilePath, &want) - t.MustCheck(want) -} - -func mustAbs(s string) string { - if !path.IsAbs(s) { - fatalf("[FAIL] %q is not absolute", s) - panic("unreachable") - } - return s -} - -func (t *T) MustCheck(want *TestCase) { - checkWritableDirPaths := []string{ - "/dev/shm", - "/tmp", - os.Getenv("XDG_RUNTIME_DIR"), - } - for _, a := range checkWritableDirPaths { - pathname := path.Join(mustAbs(a), ".hakurei-check") - if err := os.WriteFile(pathname, make([]byte, 1<<8), 0600); err != nil { - fatalf("[FAIL] %s", err) - } else if err = os.Remove(pathname); err != nil { - fatalf("[FAIL] %s", err) - } else { - printf("[ OK ] %s is writable", a) - } - } - - if want.Env != nil { - var ( - fail bool - i int - got string - ) - for i, got = range os.Environ() { - if i == len(want.Env) { - fatalf("got more than %d environment variables", len(want.Env)) - } - if got != want.Env[i] { - fail = true - printf("[FAIL] %s", got) - } else { - printf("[ OK ] %s", got) - } - } - - i++ - if i != len(want.Env) { - fatalf("got %d environment variables, want %d", i, len(want.Env)) - } - - if fail { - fatalf("[FAIL] some environment variables did not match") - } - } else { - printf("[SKIP] skipping environ check") - } - - if want.FS != nil && t.FS != nil { - if err := want.FS.Compare(".", t.FS); err != nil { - fatalf("%v", err) - } - } else { - printf("[SKIP] skipping fs check") - } - - if want.Mount != nil { - var fail bool - m := mustParseMountinfo(t.MountsPath) - i := 0 - for ent := range m.Entries() { - if i == len(want.Mount) { - fatalf("got more than %d entries", i) - } - if !ent.EqualWithIgnore(want.Mount[i], "//ignore") { - fail = true - printf("[FAIL] %s", ent) - } else { - printf("[ OK ] %s", ent) - } - - i++ - } - if err := m.Err(); err != nil { - fatalf("%v", err) - } - - if i != len(want.Mount) { - fatalf("got %d entries, want %d", i, len(want.Mount)) - } - - if fail { - fatalf("[FAIL] some mount points did not match") - } - } else { - printf("[SKIP] skipping mounts check") - } - - if want.Seccomp { - if trySyscalls() != nil { - os.Exit(1) - } - } else { - printf("[SKIP] skipping seccomp check") - } - - if want.TrySocket != "" { - abstractConn, abstractErr := net.Dial("unix", "@"+want.TrySocket) - pathnameConn, pathnameErr := net.Dial("unix", want.TrySocket) - ok := true - - if abstractErr == nil { - if err := abstractConn.Close(); err != nil { - ok = false - log.Printf("Close: %v", err) - } - } - if pathnameErr == nil { - if err := pathnameConn.Close(); err != nil { - ok = false - log.Printf("Close: %v", err) - } - } - - abstractWantErr := error(syscall.EPERM) - pathnameWantErr := error(syscall.ENOENT) - if want.SocketAbstract { - abstractWantErr = nil - } - if want.SocketPathname { - pathnameWantErr = nil - } - - if !errors.Is(abstractErr, abstractWantErr) { - ok = false - log.Printf("abstractErr: %v, want %v", abstractErr, abstractWantErr) - } - if !errors.Is(pathnameErr, pathnameWantErr) { - ok = false - log.Printf("pathnameErr: %v, want %v", pathnameErr, pathnameWantErr) - } - - if !ok { - os.Exit(1) - } - } -} - -func MustCheckFilter(pid int, want string) { - err := CheckFilter(pid, want) - if err == nil { - return - } - - var perr *ptraceError - if !errors.As(err, &perr) { - fatalf("%s", err) - } - switch perr.op { - case "PTRACE_ATTACH": - fatalf("cannot attach to process %d: %v", pid, err) - case "PTRACE_SECCOMP_GET_FILTER": - if perr.errno == syscall.ENOENT { - fatalf("seccomp filter not installed for process %d", pid) - } - fatalf("cannot get filter: %v", err) - default: - fatalf("cannot check filter: %v", err) - } - - *(*int)(nil) = 0 // not reached -} - -func CheckFilter(pid int, want string) error { - if err := ptraceAttach(pid); err != nil { - return err - } - defer func() { - if err := ptraceDetach(pid); err != nil { - printf("cannot detach from process %d: %v", pid, err) - } - }() - - h := sha512.New() - - if buf, err := getFilter[[8]byte](pid, 0); err != nil { - return err - } else { - for _, b := range buf { - h.Write(b[:]) - } - } - - if got := hex.EncodeToString(h.Sum(nil)); got != want { - printf("[FAIL] %s", got) - return syscall.ENOTRECOVERABLE - } else { - printf("[ OK ] %s", got) - return nil - } -} - -func mustDecode(wantFilePath string, v any) { - if f, err := os.Open(wantFilePath); err != nil { - fatalf("cannot open %q: %v", wantFilePath, err) - } else if err = json.NewDecoder(f).Decode(v); err != nil { - fatalf("cannot decode %q: %v", wantFilePath, err) - } else if err = f.Close(); err != nil { - fatalf("cannot close %q: %v", wantFilePath, err) - } -} - -func mustParseMountinfo(name string) *Mountinfo { - m := NewMountinfo(name) - if err := m.Parse(); err != nil { - fatalf("%v", err) - panic("unreachable") - } - return m -} |