mirror of
https://github.com/containers/podman.git
synced 2025-05-20 08:36:23 +08:00
80c0fceb24
From a security point of view, it would be nice to be able to map a rootless usernamespace that does not use your own UID within the container. This would add protection against a hostile process escapping the container and reading content in your homedir. Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
399 lines
14 KiB
Go
399 lines
14 KiB
Go
package integration
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/*
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toolbox_test.go is under the care of the Toolbox Team.
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The tests are trying to stress parts of Podman that Toolbox[0] needs for
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its functionality.
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[0] https://github.com/containers/toolbox
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Info about test cases:
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- some tests rely on a certain configuration of a container that is done by
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executing several commands in the entry-point of a container. To make
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sure the initialization had enough time to be executed,
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WaitContainerReady() after the container is started.
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- in several places there's an invocation of 'podman logs' It is there mainly
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to ease debugging when a test goes wrong (during the initialization of a
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container) but sometimes it is also used in the test case itself.
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Maintainers (Toolbox Team):
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- Ondřej Míchal <harrymichal@fedoraproject.org>
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- Debarshi Ray <rishi@fedoraproject.org>
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Also available on Freenode IRC on #silverblue or #podman
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*/
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import (
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"fmt"
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"os"
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"os/exec"
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"os/user"
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"path"
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"strconv"
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"strings"
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"syscall"
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"github.com/containers/podman/v4/pkg/rootless"
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. "github.com/containers/podman/v4/test/utils"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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. "github.com/onsi/gomega/gexec"
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)
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var _ = Describe("Toolbox-specific testing", func() {
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var (
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tempdir string
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err error
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podmanTest *PodmanTestIntegration
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)
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BeforeEach(func() {
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tempdir, err = CreateTempDirInTempDir()
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if err != nil {
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os.Exit(1)
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}
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podmanTest = PodmanTestCreate(tempdir)
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podmanTest.Setup()
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podmanTest.SeedImages()
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})
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AfterEach(func() {
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podmanTest.Cleanup()
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f := CurrentGinkgoTestDescription()
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processTestResult(f)
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})
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It("podman run --dns=none - allows self-management of /etc/resolv.conf", func() {
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session := podmanTest.Podman([]string{"run", "--dns", "none", ALPINE, "sh", "-c",
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"rm -f /etc/resolv.conf; touch -d '1970-01-01 00:02:03' /etc/resolv.conf; stat -c %s:%Y /etc/resolv.conf"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring("0:123"))
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})
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It("podman run --no-hosts - allows self-management of /etc/hosts", func() {
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session := podmanTest.Podman([]string{"run", "--no-hosts", ALPINE, "sh", "-c",
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"rm -f /etc/hosts; touch -d '1970-01-01 00:02:03' /etc/hosts; stat -c %s:%Y /etc/hosts"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring("0:123"))
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})
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It("podman create --ulimit host + podman exec - correctly mirrors hosts ulimits", func() {
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if podmanTest.RemoteTest {
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Skip("Ulimit check does not work with a remote client")
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}
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var session *PodmanSessionIntegration
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var containerHardLimit int
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var rlimit syscall.Rlimit
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var err error
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err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlimit)
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Expect(err).To(BeNil())
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fmt.Printf("Expected value: %d", rlimit.Max)
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session = podmanTest.Podman([]string{"create", "--name", "test", "--ulimit", "host", ALPINE,
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"sleep", "1000"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"start", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"exec", "test", "sh", "-c",
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"ulimit -H -n"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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containerHardLimit, err = strconv.Atoi(strings.Trim(session.OutputToString(), "\n"))
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Expect(err).To(BeNil())
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Expect(containerHardLimit).To(BeNumerically(">=", rlimit.Max))
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})
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It("podman create --ipc=host --pid=host + podman exec - correct shared memory limit size", func() {
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// Comparison of the size of /dev/shm on the host being equal to the one in
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// a container
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if podmanTest.RemoteTest {
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Skip("Shm size check does not work with a remote client")
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}
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SkipIfRootlessCgroupsV1("Not supported for rootless + CgroupsV1")
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var session *PodmanSessionIntegration
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var cmd *exec.Cmd
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var hostShmSize, containerShmSize int
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var err error
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// Because Alpine uses busybox, most commands don't offer advanced options
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// like "--output" in df. Therefore the value of the field 'Size' (or
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// ('1K-blocks') needs to be extracted manually.
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cmd = exec.Command("df", "/dev/shm")
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res, err := cmd.Output()
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Expect(err).To(BeNil())
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lines := strings.SplitN(string(res), "\n", 2)
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fields := strings.Fields(lines[len(lines)-1])
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hostShmSize, err = strconv.Atoi(fields[1])
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Expect(err).To(BeNil())
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session = podmanTest.Podman([]string{"create", "--name", "test", "--ipc=host", "--pid=host", ALPINE,
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"sleep", "1000"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"start", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"exec", "test",
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"df", "/dev/shm"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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lines = session.OutputToStringArray()
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fields = strings.Fields(lines[len(lines)-1])
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containerShmSize, err = strconv.Atoi(fields[1])
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Expect(err).To(BeNil())
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// In some cases it may happen that the size of /dev/shm is not exactly
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// equal. Therefore it's fine if there's a slight tolerance between the
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// compared values.
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Expect(hostShmSize).To(BeNumerically("~", containerShmSize, 100))
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})
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It("podman create --userns=keep-id --user root:root - entrypoint - entrypoint is executed as root", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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session := podmanTest.Podman([]string{"run", "--userns=keep-id", "--user", "root:root", ALPINE,
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"id"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring("uid=0(root) gid=0(root)"))
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})
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It("podman create --userns=keep-id + podman exec - correct names of user and group", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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var session *PodmanSessionIntegration
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var err error
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currentUser, err := user.Current()
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Expect(err).To(BeNil())
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currentGroup, err := user.LookupGroupId(currentUser.Gid)
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Expect(err).To(BeNil())
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session = podmanTest.Podman([]string{"create", "--name", "test", "--userns=keep-id", ALPINE,
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"sleep", "1000"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(err).To(BeNil())
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session = podmanTest.Podman([]string{"start", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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expectedOutput := fmt.Sprintf("uid=%s(%s) gid=%s(%s)",
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currentUser.Uid, currentUser.Username,
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currentGroup.Gid, currentGroup.Name)
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session = podmanTest.Podman([]string{"exec", "test",
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"id"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring(expectedOutput))
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})
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It("podman create --userns=keep-id - entrypoint - adding user with useradd and then removing their password", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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var session *PodmanSessionIntegration
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var username string = "testuser"
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var homeDir string = "/home/testuser"
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var shell string = "/bin/sh"
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var uid string = "1001"
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var gid string = "1001"
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useradd := fmt.Sprintf("useradd --home-dir %s --shell %s --uid %s %s",
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homeDir, shell, uid, username)
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passwd := fmt.Sprintf("passwd --delete %s", username)
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session = podmanTest.Podman([]string{"create", "--log-driver", "k8s-file", "--name", "test", "--userns=keep-id", "--user", "root:root", fedoraToolbox, "sh", "-c",
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fmt.Sprintf("%s; %s; echo READY; sleep 1000", useradd, passwd)})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"start", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(WaitContainerReady(podmanTest, "test", "READY", 5, 1)).To(BeTrue())
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expectedOutput := fmt.Sprintf("%s:x:%s:%s::%s:%s",
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username, uid, gid, homeDir, shell)
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session = podmanTest.Podman([]string{"exec", "test", "cat", "/etc/passwd"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring(expectedOutput))
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expectedOutput = "passwd: Note: deleting a password also unlocks the password."
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session = podmanTest.Podman([]string{"logs", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.ErrorToString()).To(ContainSubstring(expectedOutput))
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})
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It("podman create --userns=keep-id + podman exec - adding group with groupadd", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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var session *PodmanSessionIntegration
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var groupName string = "testgroup"
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var gid string = "1001"
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groupadd := fmt.Sprintf("groupadd --gid %s %s", gid, groupName)
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session = podmanTest.Podman([]string{"create", "--log-driver", "k8s-file", "--name", "test", "--userns=keep-id", "--user", "root:root", fedoraToolbox, "sh", "-c",
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fmt.Sprintf("%s; echo READY; sleep 1000", groupadd)})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"start", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(WaitContainerReady(podmanTest, "test", "READY", 5, 1)).To(BeTrue())
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session = podmanTest.Podman([]string{"exec", "test", "cat", "/etc/group"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring(groupName))
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session = podmanTest.Podman([]string{"logs", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring("READY"))
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})
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It("podman create --userns=keep-id - entrypoint - modifying existing user with usermod - add to new group, change home/shell/uid", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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var session *PodmanSessionIntegration
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var badHomeDir string = "/home/badtestuser"
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var badShell string = "/bin/sh"
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var badUID string = "1001"
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var username string = "testuser"
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var homeDir string = "/home/testuser"
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var shell string = "/bin/bash"
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var uid string = "2000"
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var groupName string = "testgroup"
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var gid string = "2000"
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// The use of bad* in the name of variables does not imply the invocation
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// of useradd should fail The user is supposed to be created successfully
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// but later his information (uid, home, shell,..) is changed via usermod.
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useradd := fmt.Sprintf("useradd --home-dir %s --shell %s --uid %s %s",
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badHomeDir, badShell, badUID, username)
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groupadd := fmt.Sprintf("groupadd --gid %s %s",
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gid, groupName)
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usermod := fmt.Sprintf("usermod --append --groups wheel --home %s --shell %s --uid %s --gid %s %s",
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homeDir, shell, uid, gid, username)
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session = podmanTest.Podman([]string{"create", "--log-driver", "k8s-file", "--name", "test", "--userns=keep-id", "--user", "root:root", fedoraToolbox, "sh", "-c",
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fmt.Sprintf("%s; %s; %s; echo READY; sleep 1000", useradd, groupadd, usermod)})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"start", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(WaitContainerReady(podmanTest, "test", "READY", 5, 1)).To(BeTrue())
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expectedUser := fmt.Sprintf("%s:x:%s:%s::%s:%s",
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username, uid, gid, homeDir, shell)
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session = podmanTest.Podman([]string{"exec", "test", "cat", "/etc/passwd"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring(expectedUser))
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session = podmanTest.Podman([]string{"logs", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring("READY"))
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})
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It("podman run --privileged --userns=keep-id --user root:root - entrypoint - (bind)mounting", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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var session *PodmanSessionIntegration
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session = podmanTest.Podman([]string{"run", "--privileged", "--userns=keep-id", "--user", "root:root", ALPINE,
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"mount", "-t", "tmpfs", "tmpfs", "/tmp"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"run", "--privileged", "--userns=keep-id", "--user", "root:root", ALPINE,
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"mount", "--rbind", "/tmp", "/var/tmp"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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})
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It("podman create + start - with all needed switches for create - sleep as entry-point", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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var session *PodmanSessionIntegration
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// These should be most of the switches that Toolbox uses to create a "toolbox" container
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// https://github.com/containers/toolbox/blob/master/src/cmd/create.go
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session = podmanTest.Podman([]string{"create",
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"--log-driver", "k8s-file",
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"--dns", "none",
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"--hostname", "toolbox",
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"--ipc", "host",
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"--label", "com.github.containers.toolbox=true",
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"--name", "test",
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"--network", "host",
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"--no-hosts",
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"--pid", "host",
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"--privileged",
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"--security-opt", "label=disable",
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"--ulimit", "host",
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"--userns=keep-id",
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"--user", "root:root",
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fedoraToolbox, "sh", "-c", "echo READY; sleep 1000"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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session = podmanTest.Podman([]string{"start", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(WaitContainerReady(podmanTest, "test", "READY", 5, 1)).To(BeTrue())
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session = podmanTest.Podman([]string{"logs", "test"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring("READY"))
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})
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It("podman run --userns=keep-id check $HOME", func() {
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SkipIfNotRootless("only meaningful when run rootless")
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var session *PodmanSessionIntegration
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currentUser, err := user.Current()
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Expect(err).To(BeNil())
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session = podmanTest.Podman([]string{"run", "-v", fmt.Sprintf("%s:%s", currentUser.HomeDir, currentUser.HomeDir), "--userns=keep-id", fedoraToolbox, "sh", "-c", "echo $HOME"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring(currentUser.HomeDir))
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if rootless.IsRootless() {
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location := path.Dir(currentUser.HomeDir)
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volumeArg := fmt.Sprintf("%s:%s", location, location)
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session = podmanTest.Podman([]string{"run",
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"--userns=keep-id",
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"--volume", volumeArg,
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fedoraToolbox, "sh", "-c", "echo $HOME"})
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session.WaitWithDefaultTimeout()
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Expect(session).Should(Exit(0))
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Expect(session.OutputToString()).To(ContainSubstring(currentUser.HomeDir))
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}
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})
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})
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