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-rw-r--r--cmd/podman/common/specgen.go2
-rw-r--r--libpod/container.go8
-rw-r--r--libpod/container_internal_linux.go58
-rw-r--r--libpod/container_internal_linux_test.go42
-rw-r--r--libpod/options.go14
-rw-r--r--pkg/specgen/generate/namespaces.go4
-rw-r--r--test/e2e/run_userns_test.go10
7 files changed, 128 insertions, 10 deletions
diff --git a/cmd/podman/common/specgen.go b/cmd/podman/common/specgen.go
index 0948e78f1..eca0da32b 100644
--- a/cmd/podman/common/specgen.go
+++ b/cmd/podman/common/specgen.go
@@ -241,6 +241,8 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
// If some mappings are specified, assume a private user namespace
if userNS.IsDefaultValue() && (!s.IDMappings.HostUIDMapping || !s.IDMappings.HostGIDMapping) {
s.UserNS.NSMode = specgen.Private
+ } else {
+ s.UserNS.NSMode = specgen.NamespaceMode(userNS)
}
s.Terminal = c.TTY
diff --git a/libpod/container.go b/libpod/container.go
index fa90fef7a..f7abfb005 100644
--- a/libpod/container.go
+++ b/libpod/container.go
@@ -278,6 +278,9 @@ type ContainerConfig struct {
User string `json:"user,omitempty"`
// Additional groups to add
Groups []string `json:"groups,omitempty"`
+ // AddCurrentUserPasswdEntry indicates that the current user passwd entry
+ // should be added to the /etc/passwd within the container
+ AddCurrentUserPasswdEntry bool `json:"addCurrentUserPasswdEntry,omitempty"`
// Namespace Config
// IDs of container to share namespaces with
@@ -786,7 +789,10 @@ func (c *Container) Hostname() string {
// WorkingDir returns the containers working dir
func (c *Container) WorkingDir() string {
- return c.config.Spec.Process.Cwd
+ if c.config.Spec.Process != nil {
+ return c.config.Spec.Process.Cwd
+ }
+ return "/"
}
// State Accessors
diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index 8bf6092c3..a3a57ae0f 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -9,6 +9,7 @@ import (
"io/ioutil"
"net"
"os"
+ "os/user"
"path"
"path/filepath"
"strconv"
@@ -34,7 +35,7 @@ import (
"github.com/containers/libpod/v2/utils"
"github.com/containers/storage/pkg/archive"
securejoin "github.com/cyphar/filepath-securejoin"
- "github.com/opencontainers/runc/libcontainer/user"
+ User "github.com/opencontainers/runc/libcontainer/user"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/opencontainers/selinux/go-selinux/label"
@@ -1448,9 +1449,23 @@ func (c *Container) getHosts() string {
return hosts
}
-// generatePasswd generates a container specific passwd file,
-// iff g.config.User is a number
-func (c *Container) generatePasswd() (string, error) {
+// generateCurrentUserPasswdEntry generates an /etc/passwd entry for the user
+// running the container engine
+func (c *Container) generateCurrentUserPasswdEntry() (string, error) {
+ uid := rootless.GetRootlessUID()
+ 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
+}
+
+// generateUserPasswdEntry generates an /etc/passwd entry for the container user
+// to run in the container.
+func (c *Container) generateUserPasswdEntry() (string, error) {
var (
groupspec string
gid int
@@ -1468,14 +1483,16 @@ func (c *Container) generatePasswd() (string, error) {
if err != nil {
return "", nil
}
+
// 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 != nil && err != User.ErrNoPasswdEntries {
return "", err
}
if err == nil {
return "", nil
}
+
if groupspec != "" {
ugid, err := strconv.ParseUint(groupspec, 10, 32)
if err == nil {
@@ -1488,14 +1505,39 @@ func (c *Container) generatePasswd() (string, error) {
gid = group.Gid
}
}
+ return fmt.Sprintf("%d:x:%d:%d:container user:%s:/bin/sh\n", uid, uid, gid, c.WorkingDir()), nil
+}
+
+// generatePasswd generates a container specific passwd file,
+// iff g.config.User is a number
+func (c *Container) generatePasswd() (string, error) {
+ if !c.config.AddCurrentUserPasswdEntry && c.config.User == "" {
+ return "", nil
+ }
+ pwd := ""
+ if c.config.User != "" {
+ entry, err := c.generateUserPasswdEntry()
+ if err != nil {
+ return "", err
+ }
+ pwd += entry
+ }
+ if c.config.AddCurrentUserPasswdEntry {
+ entry, err := c.generateCurrentUserPasswdEntry()
+ if err != nil {
+ return "", err
+ }
+ pwd += entry
+ }
+ if pwd == "" {
+ return "", nil
+ }
originPasswdFile := filepath.Join(c.state.Mountpoint, "/etc/passwd")
orig, err := ioutil.ReadFile(originPasswdFile)
if err != nil && !os.IsNotExist(err) {
return "", errors.Wrapf(err, "unable to read passwd file %s", originPasswdFile)
}
-
- pwd := fmt.Sprintf("%s%d:x:%d:%d:container user:%s:/bin/sh\n", orig, uid, uid, gid, c.WorkingDir())
- passwdFile, err := c.writeStringToRundir("passwd", pwd)
+ passwdFile, err := c.writeStringToRundir("passwd", string(orig)+pwd)
if err != nil {
return "", errors.Wrapf(err, "failed to create temporary passwd file")
}
diff --git a/libpod/container_internal_linux_test.go b/libpod/container_internal_linux_test.go
new file mode 100644
index 000000000..078cc53a7
--- /dev/null
+++ b/libpod/container_internal_linux_test.go
@@ -0,0 +1,42 @@
+// +build linux
+
+package libpod
+
+import (
+ "io/ioutil"
+ "os"
+ "testing"
+
+ spec "github.com/opencontainers/runtime-spec/specs-go"
+ "github.com/stretchr/testify/assert"
+)
+
+func TestGenerateUserPasswdEntry(t *testing.T) {
+ dir, err := ioutil.TempDir("", "libpod_test_")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.RemoveAll(dir)
+
+ c := Container{
+ config: &ContainerConfig{
+ User: "123:456",
+ Spec: &spec.Spec{},
+ },
+ state: &ContainerState{
+ Mountpoint: "/does/not/exist/tmp/",
+ },
+ }
+ user, err := c.generateUserPasswdEntry()
+ if err != nil {
+ t.Fatal(err)
+ }
+ assert.Equal(t, user, "123:x:123:456:container user:/:/bin/sh\n")
+
+ c.config.User = "567"
+ user, err = c.generateUserPasswdEntry()
+ if err != nil {
+ t.Fatal(err)
+ }
+ assert.Equal(t, user, "567:x:567:0:container user:/:/bin/sh\n")
+}
diff --git a/libpod/options.go b/libpod/options.go
index 61d1676f1..104d7c9db 100644
--- a/libpod/options.go
+++ b/libpod/options.go
@@ -866,6 +866,20 @@ func WithPIDNSFrom(nsCtr *Container) CtrCreateOption {
}
}
+// WithAddCurrentUserPasswdEntry indicates that container should add current
+// user entry to /etc/passwd, since the UID will be mapped into the container,
+// via user namespace
+func WithAddCurrentUserPasswdEntry() CtrCreateOption {
+ return func(ctr *Container) error {
+ if ctr.valid {
+ return define.ErrCtrFinalized
+ }
+
+ ctr.config.AddCurrentUserPasswdEntry = true
+ return nil
+ }
+}
+
// WithUserNSFrom indicates the the container should join the user namespace of
// the given container.
// If the container has joined a pod, it can only join the namespaces of
diff --git a/pkg/specgen/generate/namespaces.go b/pkg/specgen/generate/namespaces.go
index 566830cd8..09d6ba445 100644
--- a/pkg/specgen/generate/namespaces.go
+++ b/pkg/specgen/generate/namespaces.go
@@ -153,7 +153,9 @@ func namespaceOptions(ctx context.Context, s *specgen.SpecGenerator, rt *libpod.
// User
switch s.UserNS.NSMode {
case specgen.KeepID:
- if !rootless.IsRootless() {
+ if rootless.IsRootless() {
+ toReturn = append(toReturn, libpod.WithAddCurrentUserPasswdEntry())
+ } else {
// keep-id as root doesn't need a user namespace
s.UserNS.NSMode = specgen.Host
}
diff --git a/test/e2e/run_userns_test.go b/test/e2e/run_userns_test.go
index 9f0466468..42f13537d 100644
--- a/test/e2e/run_userns_test.go
+++ b/test/e2e/run_userns_test.go
@@ -89,6 +89,16 @@ var _ = Describe("Podman UserNS support", func() {
Expect(ok).To(BeTrue())
})
+ It("podman --userns=keep-id check passwd", func() {
+ session := podmanTest.Podman([]string{"run", "--userns=keep-id", "alpine", "id", "-un"})
+ session.WaitWithDefaultTimeout()
+ Expect(session.ExitCode()).To(Equal(0))
+ u, err := user.Current()
+ Expect(err).To(BeNil())
+ ok, _ := session.GrepString(u.Name)
+ Expect(ok).To(BeTrue())
+ })
+
It("podman --userns=keep-id root owns /usr", func() {
session := podmanTest.Podman([]string{"run", "--userns=keep-id", "alpine", "stat", "-c%u", "/usr"})
session.WaitWithDefaultTimeout()
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-09-24 16:42:58 +0000