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package sandbox_test
import (
"bytes"
"context"
"encoding/json"
"log"
"os"
"os/exec"
"syscall"
"testing"
"time"
"git.gensokyo.uk/security/fortify/fst"
"git.gensokyo.uk/security/fortify/internal"
"git.gensokyo.uk/security/fortify/internal/fmsg"
"git.gensokyo.uk/security/fortify/internal/sandbox"
"git.gensokyo.uk/security/fortify/ldd"
"git.gensokyo.uk/security/fortify/seccomp"
check "git.gensokyo.uk/security/fortify/test/sandbox"
)
func TestContainer(t *testing.T) {
{
oldVerbose := fmsg.Load()
fmsg.Store(true)
t.Cleanup(func() { fmsg.Store(oldVerbose) })
}
testCases := []struct {
name string
flags sandbox.HardeningFlags
ops *sandbox.Ops
mnt []*check.Mntent
host string
}{
{"minimal", 0, new(sandbox.Ops), nil, "test-minimal"},
{"allow", sandbox.FAllowUserns | sandbox.FAllowNet | sandbox.FAllowTTY,
new(sandbox.Ops), nil, "test-minimal"},
{"tmpfs", 0,
new(sandbox.Ops).
Tmpfs(fst.Tmp, 0, 0755),
[]*check.Mntent{
{FSName: "tmpfs", Dir: fst.Tmp, Type: "tmpfs", Opts: "\x00"},
}, "test-tmpfs"},
{"dev", sandbox.FAllowTTY, // go test output is not a tty
new(sandbox.Ops).
Dev("/dev"),
[]*check.Mntent{
{FSName: "devtmpfs", Dir: "/dev", Type: "tmpfs", Opts: "\x00"},
{FSName: "devtmpfs", Dir: "/dev/null", Type: "devtmpfs", Opts: "\x00", Freq: -1, Passno: -1},
{FSName: "devtmpfs", Dir: "/dev/zero", Type: "devtmpfs", Opts: "\x00", Freq: -1, Passno: -1},
{FSName: "devtmpfs", Dir: "/dev/full", Type: "devtmpfs", Opts: "\x00", Freq: -1, Passno: -1},
{FSName: "devtmpfs", Dir: "/dev/random", Type: "devtmpfs", Opts: "\x00", Freq: -1, Passno: -1},
{FSName: "devtmpfs", Dir: "/dev/urandom", Type: "devtmpfs", Opts: "\x00", Freq: -1, Passno: -1},
{FSName: "devtmpfs", Dir: "/dev/tty", Type: "devtmpfs", Opts: "\x00", Freq: -1, Passno: -1},
{FSName: "devpts", Dir: "/dev/pts", Type: "devpts", Opts: "rw,nosuid,noexec,relatime,mode=620,ptmxmode=666", Freq: 0, Passno: 0},
}, ""},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
container := sandbox.New(ctx, os.Args[0], "-test.v",
"-test.run=TestHelperCheckContainer", "--", "check", tc.host)
container.Uid = 1000
container.Gid = 100
container.Hostname = tc.host
container.CommandContext = commandContext
container.Flags |= tc.flags
container.Stdout, container.Stderr = os.Stdout, os.Stderr
container.Ops = tc.ops
if container.Args[5] == "" {
if name, err := os.Hostname(); err != nil {
t.Fatalf("cannot get hostname: %v", err)
} else {
container.Args[5] = name
}
}
container.
Tmpfs("/tmp", 0, 0755).
Bind(os.Args[0], os.Args[0], 0)
// in case test has cgo enabled
var libPaths []string
if entries, err := ldd.ExecFilter(ctx,
commandContext,
func(v []byte) []byte {
return bytes.SplitN(v, []byte("TestHelperInit\n"), 2)[1]
}, os.Args[0]); err != nil {
log.Fatalf("ldd: %v", err)
} else {
libPaths = ldd.Path(entries)
}
for _, name := range libPaths {
container.Bind(name, name, 0)
}
mnt := make([]*check.Mntent, 0, 3+len(libPaths))
mnt = append(mnt, &check.Mntent{FSName: "rootfs", Dir: "/", Type: "tmpfs", Opts: "host_passthrough"})
mnt = append(mnt, tc.mnt...)
mnt = append(mnt,
&check.Mntent{FSName: "tmpfs", Dir: "/tmp", Type: "tmpfs", Opts: "host_passthrough"},
&check.Mntent{FSName: "\x00", Dir: os.Args[0], Type: "\x00", Opts: "\x00"})
for _, name := range libPaths {
mnt = append(mnt, &check.Mntent{FSName: "\x00", Dir: name, Type: "\x00", Opts: "\x00", Freq: -1, Passno: -1})
}
mnt = append(mnt, &check.Mntent{FSName: "proc", Dir: "/proc", Type: "proc", Opts: "rw,nosuid,nodev,noexec,relatime"})
mntentWant := new(bytes.Buffer)
if err := json.NewEncoder(mntentWant).Encode(mnt); err != nil {
t.Fatalf("cannot serialise mntent: %v", err)
}
container.Stdin = mntentWant
// needs /proc to check mntent
container.Proc("/proc")
if err := container.Start(); err != nil {
fmsg.PrintBaseError(err, "start:")
t.Fatalf("cannot start container: %v", err)
} else if err = container.Serve(); err != nil {
fmsg.PrintBaseError(err, "serve:")
t.Errorf("cannot serve setup params: %v", err)
}
if err := container.Wait(); err != nil {
fmsg.PrintBaseError(err, "wait:")
t.Fatalf("wait: %v", err)
}
})
}
}
func TestContainerString(t *testing.T) {
container := sandbox.New(context.TODO(), "ldd", "/usr/bin/env")
container.Flags |= sandbox.FAllowDevel
container.Seccomp |= seccomp.FlagMultiarch
want := `argv: ["ldd" "/usr/bin/env"], flags: 0x2, seccomp: 0x2e`
if got := container.String(); got != want {
t.Errorf("String: %s, want %s", got, want)
}
}
func TestHelperInit(t *testing.T) {
if len(os.Args) != 5 || os.Args[4] != "init" {
return
}
sandbox.Init(internal.Exit)
}
func TestHelperCheckContainer(t *testing.T) {
if len(os.Args) != 6 || os.Args[4] != "check" {
return
}
t.Run("user", func(t *testing.T) {
if uid := syscall.Getuid(); uid != 1000 {
t.Errorf("Getuid: %d, want 1000", uid)
}
if gid := syscall.Getgid(); gid != 100 {
t.Errorf("Getgid: %d, want 100", gid)
}
})
t.Run("hostname", func(t *testing.T) {
if name, err := os.Hostname(); err != nil {
t.Fatalf("cannot get hostname: %v", err)
} else if name != os.Args[5] {
t.Errorf("Hostname: %q, want %q", name, os.Args[5])
}
})
t.Run("seccomp", func(t *testing.T) { check.MustAssertSeccomp() })
t.Run("mntent", func(t *testing.T) { check.MustAssertMounts("", "/proc/mounts", "/proc/self/fd/0") })
}
func commandContext(ctx context.Context) *exec.Cmd {
return exec.CommandContext(ctx, os.Args[0], "-test.v",
"-test.run=TestHelperInit", "--", "init")
}
|
