gopkg.in/docker/docker.v20@v20.10.27/integration/build/build_userns_linux_test.go (about)

     1  package build // import "github.com/docker/docker/integration/build"
     2  
     3  import (
     4  	"bufio"
     5  	"bytes"
     6  	"context"
     7  	"io"
     8  	"os"
     9  	"strings"
    10  	"testing"
    11  
    12  	"github.com/docker/docker/api/types"
    13  	"github.com/docker/docker/integration/internal/container"
    14  	"github.com/docker/docker/pkg/jsonmessage"
    15  	"github.com/docker/docker/pkg/stdcopy"
    16  	"github.com/docker/docker/testutil/daemon"
    17  	"github.com/docker/docker/testutil/fakecontext"
    18  	"github.com/docker/docker/testutil/fixtures/load"
    19  	"gotest.tools/v3/assert"
    20  	"gotest.tools/v3/skip"
    21  )
    22  
    23  // Implements a test for https://github.com/moby/moby/issues/41723
    24  // Images built in a user-namespaced daemon should have capabilities serialised in
    25  // VFS_CAP_REVISION_2 (no user-namespace root uid) format rather than V3 (that includes
    26  // the root uid).
    27  func TestBuildUserNamespaceValidateCapabilitiesAreV2(t *testing.T) {
    28  	skip.If(t, testEnv.DaemonInfo.OSType != "linux")
    29  	skip.If(t, testEnv.IsRemoteDaemon())
    30  	skip.If(t, !testEnv.IsUserNamespaceInKernel())
    31  	skip.If(t, testEnv.IsRootless())
    32  
    33  	const imageTag = "capabilities:1.0"
    34  
    35  	tmp, err := os.MkdirTemp("", "integration-")
    36  	assert.NilError(t, err)
    37  	defer os.RemoveAll(tmp)
    38  
    39  	dUserRemap := daemon.New(t)
    40  	dUserRemap.Start(t, "--userns-remap", "default")
    41  	ctx := context.Background()
    42  	clientUserRemap := dUserRemap.NewClientT(t)
    43  	defer clientUserRemap.Close()
    44  
    45  	err = load.FrozenImagesLinux(clientUserRemap, "debian:bullseye-slim")
    46  	assert.NilError(t, err)
    47  
    48  	dUserRemapRunning := true
    49  	defer func() {
    50  		if dUserRemapRunning {
    51  			dUserRemap.Stop(t)
    52  			dUserRemap.Cleanup(t)
    53  		}
    54  	}()
    55  
    56  	dockerfile := `
    57  		FROM debian:bullseye-slim
    58  		RUN apt-get update && apt-get install -y libcap2-bin --no-install-recommends
    59  		RUN setcap CAP_NET_BIND_SERVICE=+eip /bin/sleep
    60  	`
    61  
    62  	source := fakecontext.New(t, "", fakecontext.WithDockerfile(dockerfile))
    63  	defer source.Close()
    64  
    65  	resp, err := clientUserRemap.ImageBuild(ctx,
    66  		source.AsTarReader(t),
    67  		types.ImageBuildOptions{
    68  			Tags: []string{imageTag},
    69  		})
    70  	assert.NilError(t, err)
    71  	defer resp.Body.Close()
    72  
    73  	buf := bytes.NewBuffer(nil)
    74  	err = jsonmessage.DisplayJSONMessagesStream(resp.Body, buf, 0, false, nil)
    75  	assert.NilError(t, err)
    76  
    77  	reader, err := clientUserRemap.ImageSave(ctx, []string{imageTag})
    78  	assert.NilError(t, err, "failed to download capabilities image")
    79  	defer reader.Close()
    80  
    81  	tar, err := os.Create(tmp + "/image.tar")
    82  	assert.NilError(t, err, "failed to create image tar file")
    83  	defer tar.Close()
    84  
    85  	_, err = io.Copy(tar, reader)
    86  	assert.NilError(t, err, "failed to write image tar file")
    87  
    88  	dUserRemap.Stop(t)
    89  	dUserRemap.Cleanup(t)
    90  	dUserRemapRunning = false
    91  
    92  	dNoUserRemap := daemon.New(t)
    93  	dNoUserRemap.Start(t)
    94  	defer func() {
    95  		dNoUserRemap.Stop(t)
    96  		dNoUserRemap.Cleanup(t)
    97  	}()
    98  
    99  	clientNoUserRemap := dNoUserRemap.NewClientT(t)
   100  	defer clientNoUserRemap.Close()
   101  
   102  	tarFile, err := os.Open(tmp + "/image.tar")
   103  	assert.NilError(t, err, "failed to open image tar file")
   104  	defer tarFile.Close()
   105  
   106  	tarReader := bufio.NewReader(tarFile)
   107  	loadResp, err := clientNoUserRemap.ImageLoad(ctx, tarReader, false)
   108  	assert.NilError(t, err, "failed to load image tar file")
   109  	defer loadResp.Body.Close()
   110  	buf = bytes.NewBuffer(nil)
   111  	err = jsonmessage.DisplayJSONMessagesStream(loadResp.Body, buf, 0, false, nil)
   112  	assert.NilError(t, err)
   113  
   114  	cid := container.Run(ctx, t, clientNoUserRemap,
   115  		container.WithImage(imageTag),
   116  		container.WithCmd("/sbin/getcap", "-n", "/bin/sleep"),
   117  	)
   118  	logReader, err := clientNoUserRemap.ContainerLogs(ctx, cid, types.ContainerLogsOptions{
   119  		ShowStdout: true,
   120  	})
   121  	assert.NilError(t, err)
   122  	defer logReader.Close()
   123  
   124  	actualStdout := new(bytes.Buffer)
   125  	actualStderr := io.Discard
   126  	_, err = stdcopy.StdCopy(actualStdout, actualStderr, logReader)
   127  	assert.NilError(t, err)
   128  	if strings.TrimSpace(actualStdout.String()) != "/bin/sleep cap_net_bind_service=eip" {
   129  		t.Fatalf("run produced invalid output: %q, expected %q", actualStdout.String(), "/bin/sleep cap_net_bind_service=eip")
   130  	}
   131  }