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|
//go:build tester
// The sandbox tester runs within a cmd/hakurei container and validates its
// state. Since the test environment is relatively predictable, the tester can
// make various assumptions about the host.
package main
import (
"errors"
"log"
"net"
"os"
"os/signal"
"path/filepath"
"syscall"
"hakurei.app/test/internal/mountinfo"
"hakurei.app/test/sandbox/testdata"
)
//#include <sys/quota.h>
import "C"
// mustAbs returns s, or terminates the program if s is not absolute.
func mustAbs(s string) string {
if !filepath.IsAbs(s) {
log.Fatalf("%q is not absolute", s)
}
return s
}
func main() {
log.SetFlags(0)
log.SetPrefix("tester: ")
if len(os.Args) != 2 {
log.Fatal("tester requires 1 argument")
}
want := testdata.Get(os.Args[1])
log.SetPrefix("tester: " + os.Args[1] + " ")
checkWritableDirPaths := []string{
"/dev/shm",
"/tmp",
os.Getenv("XDG_RUNTIME_DIR"),
}
for _, a := range checkWritableDirPaths {
pathname := filepath.Join(mustAbs(a), ".hakurei-check")
if err := os.WriteFile(pathname, make([]byte, 1<<8), 0600); err != nil {
log.Fatalf("[FAIL] %s", err)
} else if err = os.Remove(pathname); err != nil {
log.Fatalf("[FAIL] %s", err)
} else {
log.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) {
log.Fatalf("got more than %d environment variables", len(want.Env))
}
if got != want.Env[i] {
fail = true
log.Printf("[FAIL] %s", got)
} else {
log.Printf("[ OK ] %s", got)
}
}
i++
if i != len(want.Env) {
log.Fatalf("got %d environment variables, want %d", i, len(want.Env))
}
if fail {
log.Fatalf("[FAIL] some environment variables did not match")
}
} else {
log.Printf("[SKIP] skipping environ check")
}
if want.FS != nil {
if err := want.FS.Compare(log.Printf, ".", os.DirFS("/")); err != nil {
log.Fatalf("%v", err)
}
} else {
log.Printf("[SKIP] skipping fs check")
}
if want.Mount != nil {
var fail bool
m, err := mountinfo.Open("")
if err != nil {
log.Fatal(err)
}
i := 0
var ent mountinfo.Entry
for m.Next() {
m.Copy(&ent)
if i == len(want.Mount) {
log.Fatalf("got more than %d entries", i)
}
if !ent.EqualWithIgnore(want.Mount[i], "//ignore") {
fail = true
log.Printf("[FAIL] %s", &ent)
} else {
log.Printf("[ OK ] %s", &ent)
}
i++
}
if err = m.Err(); err != nil {
log.Fatalf("%v", err)
}
if i != len(want.Mount) {
log.Fatalf("got %d entries, want %d", i, len(want.Mount))
}
if fail {
log.Fatalf("[FAIL] some mount points did not match")
}
} else {
log.Printf("[SKIP] skipping mounts check")
}
if want.Seccomp {
const NULL = 0
for _, tc := range []struct {
name string
errno syscall.Errno
trap, a1, a2, a3, a4, a5, a6 uintptr
}{
{"syslog", syscall.EPERM, syscall.SYS_SYSLOG, 0, NULL, NULL, NULL, NULL, NULL},
{"acct", syscall.EPERM, syscall.SYS_ACCT, 0, NULL, NULL, NULL, NULL, NULL},
{"quotactl", syscall.EPERM, syscall.SYS_QUOTACTL, C.Q_GETQUOTA, NULL, uintptr(os.Getuid()), NULL, NULL, NULL},
{"add_key", syscall.EPERM, syscall.SYS_ADD_KEY, NULL, NULL, NULL, NULL, NULL, NULL},
{"keyctl", syscall.EPERM, syscall.SYS_KEYCTL, NULL, NULL, NULL, NULL, NULL, NULL},
{"request_key", syscall.EPERM, syscall.SYS_REQUEST_KEY, NULL, NULL, NULL, NULL, NULL, NULL},
{"move_pages", syscall.EPERM, syscall.SYS_MOVE_PAGES, uintptr(os.Getpid()), NULL, NULL, NULL, NULL, NULL},
{"mbind", syscall.EPERM, syscall.SYS_MBIND, NULL, NULL, NULL, NULL, NULL, NULL},
{"get_mempolicy", syscall.EPERM, syscall.SYS_GET_MEMPOLICY, NULL, NULL, NULL, NULL, NULL, NULL},
{"set_mempolicy", syscall.EPERM, syscall.SYS_SET_MEMPOLICY, NULL, NULL, NULL, NULL, NULL, NULL},
{"migrate_pages", syscall.EPERM, syscall.SYS_MIGRATE_PAGES, NULL, NULL, NULL, NULL, NULL, NULL},
} {
if _, _, errno := syscall.Syscall6(tc.trap, tc.a1, tc.a2, tc.a3, tc.a4, tc.a5, tc.a6); errno != tc.errno {
log.Fatalf("[FAIL] %s: %v, want %v", tc.name, errno, tc.errno)
}
log.Printf("[ OK ] %s: %v", tc.name, tc.errno)
}
} else {
log.Printf("[SKIP] skipping seccomp check")
}
if want.TrySocket != "" {
retry:
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)
}
}
if errors.Is(
abstractErr,
syscall.EAGAIN,
) || errors.Is(
pathnameErr,
syscall.EAGAIN,
) {
goto retry
}
abstractWantErr := error(want.ErrnoAbstract)
pathnameWantErr := error(want.ErrnoPathname)
if want.ErrnoAbstract == 0 {
abstractWantErr = nil
}
if want.ErrnoPathname == 0 {
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)
}
}
s := make(chan os.Signal, 1)
signal.Notify(s, syscall.SIGTERM)
if _, err := os.Stdout.Write(make([]byte, 8)); err != nil {
log.Fatalf("cannot notify testsuite: %v", err)
}
<-s
}
|
