1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
package build // import "github.com/docker/docker/integration/build"
import (
"bufio"
"bytes"
"context"
"io"
"io/ioutil"
"os"
"strings"
"testing"
"github.com/docker/docker/api/types"
"github.com/docker/docker/integration/internal/container"
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/pkg/stdcopy"
"github.com/docker/docker/testutil/daemon"
"github.com/docker/docker/testutil/fakecontext"
"github.com/docker/docker/testutil/fixtures/load"
"gotest.tools/v3/assert"
"gotest.tools/v3/skip"
)
// Implements a test for https://github.com/moby/moby/issues/41723
// Images built in a user-namespaced daemon should have capabilities serialised in
// VFS_CAP_REVISION_2 (no user-namespace root uid) format rather than V3 (that includes
// the root uid).
func TestBuildUserNamespaceValidateCapabilitiesAreV2(t *testing.T) {
skip.If(t, testEnv.DaemonInfo.OSType != "linux")
skip.If(t, testEnv.IsRemoteDaemon())
skip.If(t, !testEnv.IsUserNamespaceInKernel())
skip.If(t, testEnv.IsRootless())
const imageTag = "capabilities:1.0"
tmp, err := ioutil.TempDir("", "integration-")
assert.NilError(t, err)
defer os.RemoveAll(tmp)
dUserRemap := daemon.New(t)
dUserRemap.Start(t, "--userns-remap", "default")
ctx := context.Background()
clientUserRemap := dUserRemap.NewClientT(t)
err = load.FrozenImagesLinux(clientUserRemap, "debian:bullseye")
assert.NilError(t, err)
dUserRemapRunning := true
defer func() {
if dUserRemapRunning {
dUserRemap.Stop(t)
}
}()
dockerfile := `
FROM debian:bullseye
RUN setcap CAP_NET_BIND_SERVICE=+eip /bin/sleep
`
source := fakecontext.New(t, "", fakecontext.WithDockerfile(dockerfile))
defer source.Close()
resp, err := clientUserRemap.ImageBuild(ctx,
source.AsTarReader(t),
types.ImageBuildOptions{
Tags: []string{imageTag},
})
assert.NilError(t, err)
defer resp.Body.Close()
buf := bytes.NewBuffer(nil)
err = jsonmessage.DisplayJSONMessagesStream(resp.Body, buf, 0, false, nil)
assert.NilError(t, err)
reader, err := clientUserRemap.ImageSave(ctx, []string{imageTag})
assert.NilError(t, err, "failed to download capabilities image")
defer reader.Close()
tar, err := os.Create(tmp + "/image.tar")
assert.NilError(t, err, "failed to create image tar file")
defer tar.Close()
_, err = io.Copy(tar, reader)
assert.NilError(t, err, "failed to write image tar file")
dUserRemap.Stop(t)
dUserRemap.Cleanup(t)
dUserRemapRunning = false
dNoUserRemap := daemon.New(t)
dNoUserRemap.Start(t)
defer dNoUserRemap.Stop(t)
clientNoUserRemap := dNoUserRemap.NewClientT(t)
tarFile, err := os.Open(tmp + "/image.tar")
assert.NilError(t, err, "failed to open image tar file")
tarReader := bufio.NewReader(tarFile)
loadResp, err := clientNoUserRemap.ImageLoad(ctx, tarReader, false)
assert.NilError(t, err, "failed to load image tar file")
defer loadResp.Body.Close()
buf = bytes.NewBuffer(nil)
err = jsonmessage.DisplayJSONMessagesStream(loadResp.Body, buf, 0, false, nil)
assert.NilError(t, err)
cid := container.Run(ctx, t, clientNoUserRemap,
container.WithImage(imageTag),
container.WithCmd("/sbin/getcap", "-n", "/bin/sleep"),
)
logReader, err := clientNoUserRemap.ContainerLogs(ctx, cid, types.ContainerLogsOptions{
ShowStdout: true,
})
assert.NilError(t, err)
actualStdout := new(bytes.Buffer)
actualStderr := ioutil.Discard
_, err = stdcopy.StdCopy(actualStdout, actualStderr, logReader)
assert.NilError(t, err)
if strings.TrimSpace(actualStdout.String()) != "/bin/sleep cap_net_bind_service=eip" {
// Activate when fix is merged: https://github.com/moby/moby/pull/41724
//t.Fatalf("run produced invalid output: %q, expected %q", actualStdout.String(), "/bin/sleep cap_net_bind_service=eip")
// t.Logf("run produced invalid output (expected until #41724 merges): %q, expected %q",
// actualStdout.String(),
// "/bin/sleep cap_net_bind_service=eip")
} else {
// Shouldn't happen until fix is merged: https://github.com/moby/moby/pull/41724
t.Fatalf("run produced valid output (unexpected until #41724 merges): %q, expected %q",
actualStdout.String(),
"/bin/sleep cap_net_bind_service=eip")
}
}
|
