feat: add support for userns #3941
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -20,12 +20,16 @@ import ( | |
| "errors" | ||
| "fmt" | ||
| "os" | ||
| "os/exec" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
| "syscall" | ||
| "testing" | ||
|
|
||
| "github.com/opencontainers/go-digest" | ||
| "gotest.tools/v3/assert" | ||
| "gotest.tools/v3/icmd" | ||
|
|
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| "github.com/containerd/containerd/v2/defaults" | ||
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@@ -324,3 +328,160 @@ func TestCreateFromOCIArchive(t *testing.T) { | |
| base.Cmd("create", "--rm", "--name", containerName, fmt.Sprintf("oci-archive://%s", tarPath)).AssertOK() | ||
| base.Cmd("start", "--attach", containerName).AssertOutContains("test-nerdctl-create-from-oci-archive") | ||
| } | ||
|
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| func TestUsernsMappingCreateCmd(t *testing.T) { | ||
| nerdtest.Setup() | ||
| testCase := &test.Case{ | ||
| Require: test.Not(nerdtest.ContainerdV1), | ||
| SubTests: []*test.Case{ | ||
| { | ||
| Description: "Test container start with valid userns", | ||
| NoParallel: true, // Changes system config so running in non parallel mode | ||
| Setup: func(data test.Data, helpers test.Helpers) { | ||
| data.Set("validUserns", "nerdctltestuser") | ||
| data.Set("expectedHostUID", "123456789") | ||
| // need to be compiled with containerd version >2.0.2 to support multi uidmap and gidmap. | ||
| if err := appendUsernsConfig(data.Get("validUserns"), data.Get("expectedHostUID")); err != nil { | ||
| t.Fatalf("Failed to append userns config: %v", err) | ||
| } | ||
| }, | ||
| Cleanup: func(data test.Data, helpers test.Helpers) { | ||
| removeUsernsConfig(t, data.Get("validUserns"), data.Get("expectedHostUID")) | ||
| helpers.Anyhow("rm", "-f", data.Identifier()) | ||
| }, | ||
| Command: func(data test.Data, helpers test.Helpers) test.TestableCommand { | ||
| helpers.Ensure("create", "--tty", "--userns", data.Get("validUserns"), "--name", data.Identifier(), testutil.NginxAlpineImage) | ||
| return helpers.Command("start", data.Identifier()) | ||
| }, | ||
| Expected: func(data test.Data, helpers test.Helpers) *test.Expected { | ||
| return &test.Expected{ | ||
| ExitCode: 0, | ||
| Output: func(stdout string, info string, t *testing.T) { | ||
| actualHostUID, err := getContainerHostUID(helpers, data.Identifier()) | ||
| if err != nil { | ||
| t.Fatalf("Failed to get container host UID: %v", err) | ||
| } | ||
| assert.Assert(t, actualHostUID == data.Get("expectedHostUID"), info) | ||
| }, | ||
| } | ||
| }, | ||
| }, | ||
| { | ||
| Description: "Test container start with invalid userns", | ||
| Setup: func(data test.Data, helpers test.Helpers) { | ||
| data.Set("invalidUserns", "invaliduser") | ||
| }, | ||
| Cleanup: func(data test.Data, helpers test.Helpers) { | ||
| helpers.Anyhow("rm", "-f", data.Identifier()) | ||
| }, | ||
| Command: func(data test.Data, helpers test.Helpers) test.TestableCommand { | ||
| return helpers.Command("create", "--tty", "--userns", data.Get("invalidUserns"), "--name", data.Identifier(), testutil.NginxAlpineImage) | ||
| }, | ||
| Expected: func(data test.Data, helpers test.Helpers) *test.Expected { | ||
| return &test.Expected{ | ||
| ExitCode: 1, | ||
| } | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| testCase.Run(t) | ||
| } | ||
|
|
||
| func runUsernsContainer(t *testing.T, name, userns, image, cmd string) *icmd.Result { | ||
| base := testutil.NewBase(t) | ||
| removeContainerArgs := []string{ | ||
| "rm", "-f", name, | ||
| } | ||
| base.Cmd(removeContainerArgs...).Run() | ||
|
|
||
| args := []string{ | ||
| "run", "-d", "--userns", userns, "--name", name, image, "sh", "-c", cmd, | ||
| } | ||
| return base.Cmd(args...).Run() | ||
| } | ||
|
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| func getContainerHostUID(helpers test.Helpers, containerName string) (string, error) { | ||
| result := helpers.Capture("inspect", "--format", "{{.State.Pid}}", containerName) | ||
| pidStr := strings.TrimSpace(result) | ||
| pid, err := strconv.Atoi(pidStr) | ||
| if err != nil { | ||
| return "", fmt.Errorf("invalid PID: %v", err) | ||
| } | ||
|
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| stat, err := os.Stat(fmt.Sprintf("/proc/%d", pid)) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to stat process: %v", err) | ||
| } | ||
|
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| uid := int(stat.Sys().(*syscall.Stat_t).Uid) | ||
| return strconv.Itoa(uid), nil | ||
| } | ||
|
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| func appendUsernsConfig(userns string, hostUid string) error { | ||
| if err := addUser(userns, hostUid); err != nil { | ||
| return fmt.Errorf("failed to add user %s: %w", userns, err) | ||
| } | ||
|
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| entry := fmt.Sprintf("%s:%s:65536\n", userns, hostUid) | ||
|
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| files := []string{"/etc/subuid", "/etc/subgid"} | ||
| for _, file := range files { | ||
| f, err := os.OpenFile(file, os.O_APPEND|os.O_WRONLY, 0644) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to open %s: %w", file, err) | ||
| } | ||
| defer f.Close() | ||
|
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||
| if _, err := f.WriteString(entry); err != nil { | ||
| return fmt.Errorf("failed to write to %s: %w", file, err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func addUser(username string, hostId string) error { | ||
|
There was a problem hiding this comment. This is scary to run by default. Needs to have an opt-in flag like Similar: nerdctl/pkg/testutil/testutil.go Line 557 in c12aaa3 |
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| cmd := exec.Command("groupadd", "-g", hostId, username) | ||
| output, err := cmd.CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("groupadd failed: %s, %w", string(output), err) | ||
| } | ||
| cmd = exec.Command("useradd", "-u", hostId, "-g", hostId, "-s", "/bin/false", username) | ||
| output, err = cmd.CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("useradd failed: %s, %w", string(output), err) | ||
| } | ||
| return nil | ||
| } | ||
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| func removeUsernsConfig(t *testing.T, userns string, hostUid string) { | ||
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| if err := delUser(userns); err != nil { | ||
| t.Logf("failed to del user %s", userns) | ||
| } | ||
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| entry := fmt.Sprintf("%s:%s:65536\n", userns, hostUid) | ||
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| files := []string{"/etc/subuid", "/etc/subgid"} | ||
| for _, file := range files { | ||
| content, err := os.ReadFile(file) | ||
| if err != nil { | ||
| t.Logf("Failed to read %s: %v", file, err) | ||
| continue | ||
| } | ||
|
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| newContent := strings.ReplaceAll(string(content), entry, "") | ||
| if err := os.WriteFile(file, []byte(newContent), 0644); err != nil { | ||
|
There was a problem hiding this comment. This is scary too. Needs to be opt-in. Also, the content of |
||
| t.Logf("Failed to write to %s: %v", file, err) | ||
| } | ||
| } | ||
| } | ||
|
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| func delUser(username string) error { | ||
| cmd := exec.Command("sudo", "userdel", username) | ||
|
There was a problem hiding this comment. sudo shouldn't be needed when the test is running as the root |
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| output, err := cmd.CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("userdel failed: %s, %w", string(output), err) | ||
| } | ||
| return nil | ||
| } | ||
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change comment to 2.1.x