diff options
| -rw-r--r-- | libpod/container_internal_linux.go | 48 | ||||
| -rw-r--r-- | test/e2e/run_passwd_test.go | 8 | ||||
| -rw-r--r-- | test/e2e/run_userns_test.go | 25 |
3 files changed, 72 insertions, 9 deletions
diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go index 795611596..4cfe992ea 100644 --- a/libpod/container_internal_linux.go +++ b/libpod/container_internal_linux.go @@ -1480,11 +1480,26 @@ func (c *Container) generateCurrentUserPasswdEntry() (string, error) { if uid == 0 { return "", nil } + u, err := user.LookupId(strconv.Itoa(rootless.GetRootlessUID())) if err != nil { return "", errors.Wrapf(err, "failed to get current user") } - return fmt.Sprintf("%s:x:%s:%s:%s:%s:/bin/sh\n", u.Username, u.Uid, u.Gid, u.Username, c.WorkingDir()), nil + + // Lookup the user to see if it exists in the container image. + _, err = lookup.GetUser(c.state.Mountpoint, u.Username) + if err != User.ErrNoPasswdEntries { + return "", err + } + + // If the user's actual home directory exists, or was mounted in - use + // that. + homeDir := c.WorkingDir() + if MountExists(c.config.Spec.Mounts, u.HomeDir) { + homeDir = u.HomeDir + } + + return fmt.Sprintf("%s:x:%s:%s:%s:%s:/bin/sh\n", u.Username, u.Uid, u.Gid, u.Username, homeDir), nil } // generateUserPasswdEntry generates an /etc/passwd entry for the container user @@ -1510,12 +1525,9 @@ func (c *Container) generateUserPasswdEntry() (string, error) { // Lookup the user to see if it exists in the container image _, err = lookup.GetUser(c.state.Mountpoint, userspec) - if err != nil && err != User.ErrNoPasswdEntries { + if err != User.ErrNoPasswdEntries { return "", err } - if err == nil { - return "", nil - } if groupspec != "" { ugid, err := strconv.ParseUint(groupspec, 10, 32) @@ -1564,6 +1576,32 @@ func (c *Container) generatePasswd() (string, error) { if pwd == "" { return "", nil } + + // If we are *not* read-only - edit /etc/passwd in the container. + // This is *gross* (shows up in changes to the container, will be + // committed to images based on the container) but it actually allows us + // to add users to the container (a bind mount breaks useradd). + // We should never get here twice, because generateUserPasswdEntry will + // not return anything if the user already exists in /etc/passwd. + if !c.IsReadOnly() { + containerPasswd, err := securejoin.SecureJoin(c.state.Mountpoint, "/etc/passwd") + if err != nil { + return "", errors.Wrapf(err, "error looking up location of container %s /etc/passwd", c.ID()) + } + + f, err := os.OpenFile(containerPasswd, os.O_APPEND|os.O_WRONLY, 0600) + if err != nil { + return "", errors.Wrapf(err, "error opening container %s /etc/passwd", c.ID()) + } + defer f.Close() + + if _, err := f.WriteString(pwd); err != nil { + return "", errors.Wrapf(err, "unable to append to container %s /etc/passwd", c.ID()) + } + + return "", nil + } + originPasswdFile := filepath.Join(c.state.Mountpoint, "/etc/passwd") orig, err := ioutil.ReadFile(originPasswdFile) if err != nil && !os.IsNotExist(err) { diff --git a/test/e2e/run_passwd_test.go b/test/e2e/run_passwd_test.go index a1414e313..8dea7d39b 100644 --- a/test/e2e/run_passwd_test.go +++ b/test/e2e/run_passwd_test.go @@ -33,27 +33,27 @@ var _ = Describe("Podman run passwd", func() { }) It("podman run no user specified ", func() { - session := podmanTest.Podman([]string{"run", BB, "mount"}) + session := podmanTest.Podman([]string{"run", "--read-only", BB, "mount"}) session.WaitWithDefaultTimeout() Expect(session.ExitCode()).To(Equal(0)) Expect(session.LineInOutputContains("passwd")).To(BeFalse()) }) It("podman run user specified in container", func() { - session := podmanTest.Podman([]string{"run", "-u", "bin", BB, "mount"}) + session := podmanTest.Podman([]string{"run", "--read-only", "-u", "bin", BB, "mount"}) session.WaitWithDefaultTimeout() Expect(session.ExitCode()).To(Equal(0)) Expect(session.LineInOutputContains("passwd")).To(BeFalse()) }) It("podman run UID specified in container", func() { - session := podmanTest.Podman([]string{"run", "-u", "2:1", BB, "mount"}) + session := podmanTest.Podman([]string{"run", "--read-only", "-u", "2:1", BB, "mount"}) session.WaitWithDefaultTimeout() Expect(session.ExitCode()).To(Equal(0)) Expect(session.LineInOutputContains("passwd")).To(BeFalse()) }) It("podman run UID not specified in container", func() { - session := podmanTest.Podman([]string{"run", "-u", "20001:1", BB, "mount"}) + session := podmanTest.Podman([]string{"run", "--read-only", "-u", "20001:1", BB, "mount"}) session.WaitWithDefaultTimeout() Expect(session.ExitCode()).To(Equal(0)) Expect(session.LineInOutputContains("passwd")).To(BeTrue()) diff --git a/test/e2e/run_userns_test.go b/test/e2e/run_userns_test.go index 198217433..25f8d0d15 100644 --- a/test/e2e/run_userns_test.go +++ b/test/e2e/run_userns_test.go @@ -111,6 +111,31 @@ var _ = Describe("Podman UserNS support", func() { Expect(session.OutputToString()).To(Equal("0")) }) + It("podman run --userns=keep-id can add users", func() { + if os.Geteuid() == 0 { + Skip("Test only runs without root") + } + + userName := os.Getenv("USER") + if userName == "" { + Skip("Can't complete test if no username available") + } + + ctrName := "ctr-name" + session := podmanTest.Podman([]string{"run", "--userns=keep-id", "--user", "root:root", "-d", "--stop-signal", "9", "--name", ctrName, fedoraMinimal, "sleep", "600"}) + session.WaitWithDefaultTimeout() + Expect(session.ExitCode()).To(Equal(0)) + + exec1 := podmanTest.Podman([]string{"exec", "-t", "-i", ctrName, "cat", "/etc/passwd"}) + exec1.WaitWithDefaultTimeout() + Expect(exec1.ExitCode()).To(Equal(0)) + Expect(exec1.OutputToString()).To(ContainSubstring(userName)) + + exec2 := podmanTest.Podman([]string{"exec", "-t", "-i", ctrName, "useradd", "testuser"}) + exec2.WaitWithDefaultTimeout() + Expect(exec2.ExitCode()).To(Equal(0)) + }) + It("podman --userns=auto", func() { u, err := user.Current() Expect(err).To(BeNil()) |