feat: add support for userns #3941
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -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" | ||
|
|
||
| "github.com/containerd/containerd/v2/defaults" | ||
|
|
||
|
|
@@ -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") | ||
| } | ||
|
|
||
| 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() | ||
| } | ||
|
|
||
| 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) | ||
| } | ||
|
|
||
| stat, err := os.Stat(fmt.Sprintf("/proc/%d", pid)) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to stat process: %v", err) | ||
| } | ||
|
|
||
| uid := int(stat.Sys().(*syscall.Stat_t).Uid) | ||
| return strconv.Itoa(uid), nil | ||
| } | ||
|
|
||
| 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) | ||
| } | ||
|
|
||
| entry := fmt.Sprintf("%s:%s:65536\n", userns, hostUid) | ||
|
|
||
| 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() | ||
|
|
||
| if _, err := f.WriteString(entry); err != nil { | ||
| return fmt.Errorf("failed to write to %s: %w", file, err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| 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 |
||
| 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 | ||
| } | ||
|
|
||
| func removeUsernsConfig(t *testing.T, userns string, hostUid string) { | ||
|
|
||
| if err := delUser(userns); err != nil { | ||
| t.Logf("failed to del user %s", userns) | ||
| } | ||
|
|
||
| entry := fmt.Sprintf("%s:%s:65536\n", userns, hostUid) | ||
|
|
||
| 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 | ||
| } | ||
|
|
||
| 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) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| 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 |
||
| output, err := cmd.CombinedOutput() | ||
| if err != nil { | ||
| return fmt.Errorf("userdel failed: %s, %w", string(output), err) | ||
| } | ||
| return nil | ||
| } | ||
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.
Oops, something went wrong.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
change comment to 2.1.x