github.com/akerouanton/docker@v1.11.0-rc3/integration-cli/docker_cli_userns_test.go (about)

     1  // +build !windows
     2  
     3  package main
     4  
     5  import (
     6  	"fmt"
     7  	"io/ioutil"
     8  	"os"
     9  	"os/exec"
    10  	"path/filepath"
    11  	"strconv"
    12  	"strings"
    13  
    14  	"github.com/docker/docker/pkg/integration/checker"
    15  	"github.com/docker/docker/pkg/system"
    16  	"github.com/go-check/check"
    17  )
    18  
    19  // user namespaces test: run daemon with remapped root setting
    20  // 1. validate uid/gid maps are set properly
    21  // 2. verify that files created are owned by remapped root
    22  func (s *DockerDaemonSuite) TestDaemonUserNamespaceRootSetting(c *check.C) {
    23  	testRequires(c, DaemonIsLinux, SameHostDaemon, UserNamespaceInKernel)
    24  
    25  	c.Assert(s.d.StartWithBusybox("--userns-remap", "default"), checker.IsNil)
    26  
    27  	tmpDir, err := ioutil.TempDir("", "userns")
    28  	c.Assert(err, checker.IsNil)
    29  
    30  	defer os.RemoveAll(tmpDir)
    31  
    32  	// we need to find the uid and gid of the remapped root from the daemon's root dir info
    33  	uidgid := strings.Split(filepath.Base(s.d.root), ".")
    34  	c.Assert(uidgid, checker.HasLen, 2, check.Commentf("Should have gotten uid/gid strings from root dirname: %s", filepath.Base(s.d.root)))
    35  	uid, err := strconv.Atoi(uidgid[0])
    36  	c.Assert(err, checker.IsNil, check.Commentf("Can't parse uid"))
    37  	gid, err := strconv.Atoi(uidgid[1])
    38  	c.Assert(err, checker.IsNil, check.Commentf("Can't parse gid"))
    39  
    40  	// writable by the remapped root UID/GID pair
    41  	c.Assert(os.Chown(tmpDir, uid, gid), checker.IsNil)
    42  
    43  	out, err := s.d.Cmd("run", "-d", "--name", "userns", "-v", tmpDir+":/goofy", "busybox", "sh", "-c", "touch /goofy/testfile; top")
    44  	c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
    45  	user := s.findUser(c, "userns")
    46  	c.Assert(uidgid[0], checker.Equals, user)
    47  
    48  	pid, err := s.d.Cmd("inspect", "--format='{{.State.Pid}}'", "userns")
    49  	c.Assert(err, checker.IsNil, check.Commentf("Could not inspect running container: out: %q", pid))
    50  	// check the uid and gid maps for the PID to ensure root is remapped
    51  	// (cmd = cat /proc/<pid>/uid_map | grep -E '0\s+9999\s+1')
    52  	out, rc1, err := runCommandPipelineWithOutput(
    53  		exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/uid_map"),
    54  		exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", uid)))
    55  	c.Assert(rc1, checker.Equals, 0, check.Commentf("Didn't match uid_map: output: %s", out))
    56  
    57  	out, rc2, err := runCommandPipelineWithOutput(
    58  		exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/gid_map"),
    59  		exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", gid)))
    60  	c.Assert(rc2, checker.Equals, 0, check.Commentf("Didn't match gid_map: output: %s", out))
    61  
    62  	// check that the touched file is owned by remapped uid:gid
    63  	stat, err := system.Stat(filepath.Join(tmpDir, "testfile"))
    64  	c.Assert(err, checker.IsNil)
    65  	c.Assert(stat.UID(), checker.Equals, uint32(uid), check.Commentf("Touched file not owned by remapped root UID"))
    66  	c.Assert(stat.GID(), checker.Equals, uint32(gid), check.Commentf("Touched file not owned by remapped root GID"))
    67  
    68  	// use host usernamespace
    69  	out, err = s.d.Cmd("run", "-d", "--name", "userns_skip", "--userns", "host", "busybox", "sh", "-c", "touch /goofy/testfile; top")
    70  	c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
    71  	user = s.findUser(c, "userns_skip")
    72  	// userns are skipped, user is root
    73  	c.Assert(user, checker.Equals, "root")
    74  }
    75  
    76  // findUser finds the uid or name of the user of the first process that runs in a container
    77  func (s *DockerDaemonSuite) findUser(c *check.C, container string) string {
    78  	out, err := s.d.Cmd("top", container)
    79  	c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
    80  	rows := strings.Split(out, "\n")
    81  	if len(rows) < 2 {
    82  		// No process rows founds
    83  		c.FailNow()
    84  	}
    85  	return strings.Fields(rows[1])[0]
    86  }