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moby--moby/integration-cli/docker_cli_userns_test.go

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// +build !windows
package main
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"github.com/docker/docker/pkg/integration/checker"
"github.com/docker/docker/pkg/system"
"github.com/go-check/check"
)
// user namespaces test: run daemon with remapped root setting
// 1. validate uid/gid maps are set properly
// 2. verify that files created are owned by remapped root
func (s *DockerDaemonSuite) TestDaemonUserNamespaceRootSetting(c *check.C) {
testRequires(c, DaemonIsLinux, SameHostDaemon, UserNamespaceInKernel)
c.Assert(s.d.StartWithBusybox("--userns-remap", "default"), checker.IsNil)
tmpDir, err := ioutil.TempDir("", "userns")
c.Assert(err, checker.IsNil)
defer os.RemoveAll(tmpDir)
// we need to find the uid and gid of the remapped root from the daemon's root dir info
uidgid := strings.Split(filepath.Base(s.d.root), ".")
c.Assert(uidgid, checker.HasLen, 2, check.Commentf("Should have gotten uid/gid strings from root dirname: %s", filepath.Base(s.d.root)))
uid, err := strconv.Atoi(uidgid[0])
c.Assert(err, checker.IsNil, check.Commentf("Can't parse uid"))
gid, err := strconv.Atoi(uidgid[1])
c.Assert(err, checker.IsNil, check.Commentf("Can't parse gid"))
// writable by the remapped root UID/GID pair
c.Assert(os.Chown(tmpDir, uid, gid), checker.IsNil)
out, err := s.d.Cmd("run", "-d", "--name", "userns", "-v", tmpDir+":/goofy", "busybox", "sh", "-c", "touch /goofy/testfile; top")
c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
user := s.findUser(c, "userns")
c.Assert(uidgid[0], checker.Equals, user)
pid, err := s.d.Cmd("inspect", "--format='{{.State.Pid}}'", "userns")
c.Assert(err, checker.IsNil, check.Commentf("Could not inspect running container: out: %q", pid))
// check the uid and gid maps for the PID to ensure root is remapped
// (cmd = cat /proc/<pid>/uid_map | grep -E '0\s+9999\s+1')
out, rc1, err := runCommandPipelineWithOutput(
exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/uid_map"),
exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", uid)))
c.Assert(rc1, checker.Equals, 0, check.Commentf("Didn't match uid_map: output: %s", out))
out, rc2, err := runCommandPipelineWithOutput(
exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/gid_map"),
exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", gid)))
c.Assert(rc2, checker.Equals, 0, check.Commentf("Didn't match gid_map: output: %s", out))
// check that the touched file is owned by remapped uid:gid
stat, err := system.Stat(filepath.Join(tmpDir, "testfile"))
c.Assert(err, checker.IsNil)
c.Assert(stat.UID(), checker.Equals, uint32(uid), check.Commentf("Touched file not owned by remapped root UID"))
c.Assert(stat.GID(), checker.Equals, uint32(gid), check.Commentf("Touched file not owned by remapped root GID"))
// use host usernamespace
out, err = s.d.Cmd("run", "-d", "--name", "userns_skip", "--userns", "host", "busybox", "sh", "-c", "touch /goofy/testfile; top")
c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
user = s.findUser(c, "userns_skip")
// userns are skipped, user is root
c.Assert(user, checker.Equals, "root")
}
// findUser finds the uid or name of the user of the first process that runs in a container
func (s *DockerDaemonSuite) findUser(c *check.C, container string) string {
out, err := s.d.Cmd("top", container)
c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
rows := strings.Split(out, "\n")
if len(rows) < 2 {
// No process rows founds
c.FailNow()
}
return strings.Fields(rows[1])[0]
}