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a1150245cc
Movified from686be57d0a, and re-ran gofmt again to address for files not present in 20.10 and vice-versa. Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (cherry picked from commit686be57d0a) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
100 lines
3.7 KiB
Go
100 lines
3.7 KiB
Go
//go:build !windows
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// +build !windows
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package main
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import (
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"testing"
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"github.com/docker/docker/pkg/stringid"
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"github.com/docker/docker/pkg/system"
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"gotest.tools/v3/assert"
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)
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// user namespaces test: run daemon with remapped root setting
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// 1. validate uid/gid maps are set properly
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// 2. verify that files created are owned by remapped root
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func (s *DockerDaemonSuite) TestDaemonUserNamespaceRootSetting(c *testing.T) {
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testRequires(c, UserNamespaceInKernel)
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s.d.StartWithBusybox(c, "--userns-remap", "default")
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tmpDir, err := ioutil.TempDir("", "userns")
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assert.NilError(c, err)
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defer os.RemoveAll(tmpDir)
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// Set a non-existent path
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tmpDirNotExists := path.Join(os.TempDir(), "userns"+stringid.GenerateRandomID())
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defer os.RemoveAll(tmpDirNotExists)
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// we need to find the uid and gid of the remapped root from the daemon's root dir info
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uidgid := strings.Split(filepath.Base(s.d.Root), ".")
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assert.Equal(c, len(uidgid), 2, fmt.Sprintf("Should have gotten uid/gid strings from root dirname: %s", filepath.Base(s.d.Root)))
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uid, err := strconv.Atoi(uidgid[0])
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assert.NilError(c, err, "Can't parse uid")
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gid, err := strconv.Atoi(uidgid[1])
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assert.NilError(c, err, "Can't parse gid")
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// writable by the remapped root UID/GID pair
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assert.NilError(c, os.Chown(tmpDir, uid, gid))
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out, err := s.d.Cmd("run", "-d", "--name", "userns", "-v", tmpDir+":/goofy", "-v", tmpDirNotExists+":/donald", "busybox", "sh", "-c", "touch /goofy/testfile; exec top")
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assert.NilError(c, err, "Output: %s", out)
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user := s.findUser(c, "userns")
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assert.Equal(c, uidgid[0], user)
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// check that the created directory is owned by remapped uid:gid
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statNotExists, err := system.Stat(tmpDirNotExists)
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assert.NilError(c, err)
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assert.Equal(c, statNotExists.UID(), uint32(uid), "Created directory not owned by remapped root UID")
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assert.Equal(c, statNotExists.GID(), uint32(gid), "Created directory not owned by remapped root GID")
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pid, err := s.d.Cmd("inspect", "--format={{.State.Pid}}", "userns")
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assert.Assert(c, err == nil, "Could not inspect running container: out: %q", pid)
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// check the uid and gid maps for the PID to ensure root is remapped
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// (cmd = cat /proc/<pid>/uid_map | grep -E '0\s+9999\s+1')
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_, err = RunCommandPipelineWithOutput(
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exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/uid_map"),
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exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", uid)))
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assert.NilError(c, err)
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_, err = RunCommandPipelineWithOutput(
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exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/gid_map"),
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exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", gid)))
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assert.NilError(c, err)
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// check that the touched file is owned by remapped uid:gid
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stat, err := system.Stat(filepath.Join(tmpDir, "testfile"))
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assert.NilError(c, err)
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assert.Equal(c, stat.UID(), uint32(uid), "Touched file not owned by remapped root UID")
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assert.Equal(c, stat.GID(), uint32(gid), "Touched file not owned by remapped root GID")
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// use host usernamespace
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out, err = s.d.Cmd("run", "-d", "--name", "userns_skip", "--userns", "host", "busybox", "sh", "-c", "touch /goofy/testfile; exec top")
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assert.Assert(c, err == nil, "Output: %s", out)
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user = s.findUser(c, "userns_skip")
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// userns are skipped, user is root
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assert.Equal(c, user, "root")
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}
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// findUser finds the uid or name of the user of the first process that runs in a container
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func (s *DockerDaemonSuite) findUser(c *testing.T, container string) string {
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out, err := s.d.Cmd("top", container)
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assert.Assert(c, err == nil, "Output: %s", out)
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rows := strings.Split(out, "\n")
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if len(rows) < 2 {
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// No process rows founds
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c.FailNow()
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}
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return strings.Fields(rows[1])[0]
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}
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