package main import ( "flag" "fmt" "io/ioutil" "os" "os/signal" "time" "github.com/criyle/go-sandbox/deamon" "github.com/criyle/go-sandbox/pkg/cgroup" "github.com/criyle/go-sandbox/pkg/memfd" "github.com/criyle/go-sandbox/pkg/rlimit" "github.com/criyle/go-sandbox/pkg/seccomp" "github.com/criyle/go-sandbox/pkg/seccomp/libseccomp" "github.com/criyle/go-sandbox/runner" "github.com/criyle/go-sandbox/runner/config" "github.com/criyle/go-sandbox/runner/ptrace" "github.com/criyle/go-sandbox/runner/unshare" "github.com/criyle/go-sandbox/types" ) const ( pathEnv = "PATH=/usr/local/bin:/usr/bin:/bin" ) var ( addReadable, addWritable, addRawReadable, addRawWritable arrayFlags allowProc, unsafe, showDetails, namespace, useCGroup, memfile bool timeLimit, realTimeLimit, memoryLimit, outputLimit, stackLimit uint64 inputFileName, outputFileName, errorFileName, workPath string useDeamon bool pType, result string args []string ) func printUsage() { fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [options] \n", os.Args[0]) flag.PrintDefaults() os.Exit(2) } func main() { deamon.ContainerInit() flag.Usage = printUsage flag.Uint64Var(&timeLimit, "tl", 1, "Set time limit (in second)") flag.Uint64Var(&realTimeLimit, "rtl", 0, "Set real time limit (in second)") flag.Uint64Var(&memoryLimit, "ml", 256, "Set memory limit (in mb)") flag.Uint64Var(&outputLimit, "ol", 64, "Set output limit (in mb)") flag.Uint64Var(&stackLimit, "sl", 1024, "Set stack limit (in mb)") flag.StringVar(&inputFileName, "in", "", "Set input file name") flag.StringVar(&outputFileName, "out", "", "Set output file name") flag.StringVar(&errorFileName, "err", "", "Set error file name") flag.StringVar(&workPath, "work-path", "", "Set the work path of the program") flag.StringVar(&pType, "type", "default", "Set the program type (for some program such as python)") flag.StringVar(&result, "res", "stdout", "Set the file name for output the result") flag.Var(&addReadable, "add-readable", "Add a readable file") flag.Var(&addWritable, "add-writable", "Add a writable file") flag.BoolVar(&unsafe, "unsafe", false, "Don't check dangerous syscalls") flag.BoolVar(&showDetails, "show-trace-details", false, "Show trace details") flag.BoolVar(&allowProc, "allow-proc", false, "Allow fork, exec... etc.") flag.Var(&addRawReadable, "add-readable-raw", "Add a readable file (don't transform to its real path)") flag.Var(&addRawWritable, "add-writable-raw", "Add a writable file (don't transform to its real path)") flag.BoolVar(&namespace, "ns", false, "Use namespace to restrict file accesses") flag.BoolVar(&useCGroup, "cgroup", false, "Use cgroup to colloct resource usage") flag.BoolVar(&memfile, "memfd", false, "Use memfd as exec file") flag.BoolVar(&useDeamon, "deamon", false, "Use deamon container to execute file") flag.Parse() args = flag.Args() if len(args) == 0 { printUsage() } if realTimeLimit < timeLimit { realTimeLimit = timeLimit + 2 } if stackLimit > memoryLimit { stackLimit = memoryLimit } if workPath == "" { workPath, _ = os.Getwd() } var ( f *os.File err error ) if result == "stdout" { f = os.Stdout } else if result == "stderr" { f = os.Stderr } else { f, err = os.Create(result) if err != nil { debug("Failed to open result file:", err) return } defer f.Close() } rt, err := start() if rt == nil { rt = &types.Result{ Status: types.StatusFatal, } } if err == nil && rt.Status != types.StatusNormal { err = rt.Status } if err != nil { debug(err) c, ok := err.(types.Status) if !ok { c = types.StatusFatal } // Handle fatal error from trace fmt.Fprintf(f, "%d %d %d %d\n", int(c), rt.UserTime, rt.UserMem, rt.ExitStatus) if c == types.StatusFatal { os.Exit(1) } } else { fmt.Fprintf(f, "%d %d %d %d\n", 0, rt.UserTime, rt.UserMem, rt.ExitStatus) } } type deamonRunner struct { *deamon.Master *deamon.ExecveParam } func (r *deamonRunner) Start(done <-chan struct{}) (<-chan types.Result, error) { return r.Master.Execve(done, r.ExecveParam) } func start() (*types.Result, error) { var ( runner runner.Runner cg *cgroup.CGroup err error execFile uintptr rt types.Result ) addRead := config.GetExtraSet(addReadable, addRawReadable) addWrite := config.GetExtraSet(addWritable, addRawWritable) h := config.GetConf(pType, workPath, args, addRead, addWrite, allowProc, showDetails) if useCGroup { cg, err = cgroup.NewCGroup("run_program") if err != nil { return nil, err } defer cg.Destroy() if err = cg.SetMemoryLimitInBytes(memoryLimit << 20); err != nil { return nil, err } } syncFunc := func(pid int) error { if cg != nil { if err := cg.AddProc(pid); err != nil { return err } } return nil } if memfile { fin, err := os.Open(args[0]) if err != nil { return nil, fmt.Errorf("filed to open args[0]: %v", err) } execf, err := memfd.DupToMemfd("run_program", fin) if err != nil { return nil, fmt.Errorf("dup to memfd failed: %v", err) } fin.Close() defer execf.Close() execFile = execf.Fd() debug("memfd: ", execFile) } // open input / output / err files files, err := prepareFiles(inputFileName, outputFileName, errorFileName) if err != nil { return nil, fmt.Errorf("failed to prepare files: %v", err) } defer closeFiles(files) // if not defined, then use the original value fds := make([]uintptr, len(files)) for i, f := range files { if f != nil { fds[i] = f.Fd() } else { fds[i] = uintptr(i) } } rlims := rlimit.RLimits{ CPU: timeLimit, CPUHard: realTimeLimit, FileSize: outputLimit, Stack: stackLimit, } actionDefault := seccomp.ActionKill if showDetails { actionDefault = seccomp.ActionTrace.WithReturnCode(seccomp.MsgDisallow) } if useDeamon { root, err := ioutil.TempDir("", "dm") if err != nil { return nil, fmt.Errorf("cannot make temp root for deamon namespace: %v", err) } defer os.RemoveAll(root) m, err := deamon.New(root) if err != nil { return nil, fmt.Errorf("failed to new master: %v", err) } defer m.Destroy() err = m.Ping() if err != nil { return nil, fmt.Errorf("failed to ping deamon: %v", err) } runner = &deamonRunner{ Master: m, ExecveParam: &deamon.ExecveParam{ Args: args, Envv: []string{pathEnv}, Fds: fds, ExecFile: execFile, RLimits: rlims.PrepareRLimit(), SyncFunc: syncFunc, }, } } else if namespace { builder := libseccomp.Builder{ Allow: append(h.SyscallAllow, h.SyscallTrace...), Default: actionDefault, } filter, err := builder.Build() if err != nil { return nil, fmt.Errorf("cannot build seccomp filter %v", err) } root, err := ioutil.TempDir("", "ns") if err != nil { return nil, fmt.Errorf("cannot make temp root for new namespace") } defer os.RemoveAll(root) runner = &unshare.Runner{ Args: h.Args, Env: []string{pathEnv}, ExecFile: execFile, WorkDir: "/w", Files: fds, RLimits: rlims, Limit: types.Limit{ TimeLimit: timeLimit * 1e3, MemoryLimit: memoryLimit << 10, }, Seccomp: filter, Root: root, Mounts: unshare.GetDefaultMounts(root, []unshare.AddBind{ { Source: workPath, Target: "w", }, }), ShowDetails: showDetails, SyncFunc: syncFunc, HostName: "run_program", DomainName: "run_program", } } else { builder := libseccomp.Builder{ Allow: h.SyscallAllow, Trace: h.SyscallTrace, Default: actionDefault, } filter, err := builder.Build() if err != nil { return nil, fmt.Errorf("failed to create seccomp filter %v", err) } runner = &ptrace.Runner{ Args: h.Args, Env: []string{pathEnv}, ExecFile: execFile, WorkDir: workPath, RLimits: rlims, Limit: types.Limit{ TimeLimit: timeLimit * 1e3, MemoryLimit: memoryLimit << 10, }, Files: fds, Seccomp: filter, ShowDetails: showDetails, Unsafe: unsafe, Handler: h, SyncFunc: syncFunc, } } // gracefully shutdown sig := make(chan os.Signal, 1) signal.Notify(sig, os.Interrupt) // Run tracer sTime := time.Now() done := make(chan struct{}) s, err := runner.Start(done) rTime := time.Now() if err != nil { return nil, fmt.Errorf("failed to execve: %v", err) } tC := time.After(time.Duration(int64(realTimeLimit) * int64(time.Second))) select { case <-sig: close(done) rt = <-s rt.Status = types.StatusFatal case <-tC: close(done) rt = <-s case rt = <-s: } eTime := time.Now() if rt.SetUpTime == 0 { rt.SetUpTime = rTime.Sub(sTime) rt.RunningTime = eTime.Sub(rTime) } debug("results:", rt, err) if useCGroup { cpu, err := cg.CpuacctUsage() if err != nil { return nil, fmt.Errorf("cgroup cpu: %v", err) } memory, err := cg.MemoryMaxUsageInBytes() if err != nil { return nil, fmt.Errorf("cgroup memory: %v", err) } debug("cgroup: cpu: ", cpu, " memory: ", memory) rt.UserTime = cpu / uint64(time.Millisecond) rt.UserMem = memory >> 10 } return &rt, nil } func debug(v ...interface{}) { if showDetails { fmt.Fprintln(os.Stderr, v...) } }