From 64d8b4eebb01c6647b0588475c785cdd075389d3 Mon Sep 17 00:00:00 2001
From: Giuseppe Scrivano <gscrivan@redhat.com>
Date: Fri, 24 Apr 2020 14:54:43 +0200
Subject: podman: implement userns=keep-id
add missing implementation for userns=keep-id and enable the user
namespaces tests.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
---
pkg/specgen/generate/namespaces.go | 20 ++++++++
pkg/specgen/namespaces.go | 14 ++++-
pkg/util/utils.go | 101 ++++++++++++++++++++-----------------
3 files changed, 86 insertions(+), 49 deletions(-)
(limited to 'pkg')
diff --git a/pkg/specgen/generate/namespaces.go b/pkg/specgen/generate/namespaces.go
index 2aaeb9513..1fdc921ce 100644
--- a/pkg/specgen/generate/namespaces.go
+++ b/pkg/specgen/generate/namespaces.go
@@ -10,6 +10,7 @@ import (
"github.com/containers/libpod/pkg/cgroups"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/libpod/pkg/specgen"
+ "github.com/containers/libpod/pkg/util"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/pkg/errors"
@@ -175,6 +176,13 @@ func GenerateNamespaceOptions(s *specgen.SpecGenerator, rt *libpod.Runtime, pod
// User
switch s.UserNS.NSMode {
+ case specgen.KeepID:
+ if rootless.IsRootless() {
+ s.User = ""
+ } else {
+ // keep-id as root doesn't need a user namespace
+ s.UserNS.NSMode = specgen.Host
+ }
case specgen.FromPod:
if pod == nil || infraCtr == nil {
return nil, errNoInfra
@@ -378,6 +386,18 @@ func specConfigureNamespaces(s *specgen.SpecGenerator, g *generate.Generator, rt
if err := g.RemoveLinuxNamespace(string(spec.UserNamespace)); err != nil {
return err
}
+ case specgen.KeepID:
+ var (
+ err error
+ uid, gid int
+ )
+ s.IDMappings, uid, gid, err = util.GetKeepIDMapping()
+ if err != nil {
+ return err
+ }
+ g.SetProcessUID(uint32(uid))
+ g.SetProcessGID(uint32(gid))
+ fallthrough
case specgen.Private:
if err := g.AddOrReplaceLinuxNamespace(string(spec.UserNamespace), ""); err != nil {
return err
diff --git a/pkg/specgen/namespaces.go b/pkg/specgen/namespaces.go
index fffbd6d9e..cee49ff51 100644
--- a/pkg/specgen/namespaces.go
+++ b/pkg/specgen/namespaces.go
@@ -76,6 +76,17 @@ func (n *Namespace) IsPod() bool {
func (n *Namespace) IsPrivate() bool {
return n.NSMode == Private
}
+
+// IsAuto indicates the namespace is auto
+func (n *Namespace) IsAuto() bool {
+ return n.NSMode == Auto
+}
+
+// IsKeepID indicates the namespace is KeepID
+func (n *Namespace) IsKeepID() bool {
+ return n.NSMode == KeepID
+}
+
func validateUserNS(n *Namespace) error {
if n == nil {
return nil
@@ -186,12 +197,11 @@ func ParseUserNamespace(ns string) (Namespace, error) {
if len(split) != 2 {
return toReturn, errors.Errorf("invalid setting for auto: mode")
}
- toReturn.NSMode = KeepID
+ toReturn.NSMode = Auto
toReturn.Value = split[1]
return toReturn, nil
case ns == "keep-id":
toReturn.NSMode = KeepID
- toReturn.NSMode = FromContainer
return toReturn, nil
}
return ParseNamespace(ns)
diff --git a/pkg/util/utils.go b/pkg/util/utils.go
index 64331cf66..917f57742 100644
--- a/pkg/util/utils.go
+++ b/pkg/util/utils.go
@@ -330,6 +330,58 @@ func ParseSignal(rawSignal string) (syscall.Signal, error) {
return sig, nil
}
+// GetKeepIDMapping returns the mappings and the user to use when keep-id is used
+func GetKeepIDMapping() (*storage.IDMappingOptions, int, int, error) {
+ options := storage.IDMappingOptions{
+ HostUIDMapping: true,
+ HostGIDMapping: true,
+ }
+ uid, gid := 0, 0
+ if rootless.IsRootless() {
+ min := func(a, b int) int {
+ if a < b {
+ return a
+ }
+ return b
+ }
+
+ uid = rootless.GetRootlessUID()
+ gid = rootless.GetRootlessGID()
+
+ uids, gids, err := rootless.GetConfiguredMappings()
+ if err != nil {
+ return nil, -1, -1, errors.Wrapf(err, "cannot read mappings")
+ }
+ maxUID, maxGID := 0, 0
+ for _, u := range uids {
+ maxUID += u.Size
+ }
+ for _, g := range gids {
+ maxGID += g.Size
+ }
+
+ options.UIDMap, options.GIDMap = nil, nil
+
+ options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(uid, maxUID)})
+ options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid, HostID: 0, Size: 1})
+ if maxUID > uid {
+ options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid + 1, HostID: uid + 1, Size: maxUID - uid})
+ }
+
+ options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(gid, maxGID)})
+ options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid, HostID: 0, Size: 1})
+ if maxGID > gid {
+ options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid + 1, HostID: gid + 1, Size: maxGID - gid})
+ }
+
+ options.HostUIDMapping = false
+ options.HostGIDMapping = false
+
+ }
+ // Simply ignore the setting and do not setup an inner namespace for root as it is a no-op
+ return &options, uid, gid, nil
+}
+
// ParseIDMapping takes idmappings and subuid and subgid maps and returns a storage mapping
func ParseIDMapping(mode namespaces.UsernsMode, uidMapSlice, gidMapSlice []string, subUIDMap, subGIDMap string) (*storage.IDMappingOptions, error) {
options := storage.IDMappingOptions{
@@ -350,53 +402,8 @@ func ParseIDMapping(mode namespaces.UsernsMode, uidMapSlice, gidMapSlice []strin
return &options, nil
}
if mode.IsKeepID() {
- if len(uidMapSlice) > 0 || len(gidMapSlice) > 0 {
- return nil, errors.New("cannot specify custom mappings with --userns=keep-id")
- }
- if len(subUIDMap) > 0 || len(subGIDMap) > 0 {
- return nil, errors.New("cannot specify subuidmap or subgidmap with --userns=keep-id")
- }
- if rootless.IsRootless() {
- min := func(a, b int) int {
- if a < b {
- return a
- }
- return b
- }
-
- uid := rootless.GetRootlessUID()
- gid := rootless.GetRootlessGID()
-
- uids, gids, err := rootless.GetConfiguredMappings()
- if err != nil {
- return nil, errors.Wrapf(err, "cannot read mappings")
- }
- maxUID, maxGID := 0, 0
- for _, u := range uids {
- maxUID += u.Size
- }
- for _, g := range gids {
- maxGID += g.Size
- }
-
- options.UIDMap, options.GIDMap = nil, nil
-
- options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(uid, maxUID)})
- options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid, HostID: 0, Size: 1})
- if maxUID > uid {
- options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid + 1, HostID: uid + 1, Size: maxUID - uid})
- }
-
- options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(gid, maxGID)})
- options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid, HostID: 0, Size: 1})
- if maxGID > gid {
- options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid + 1, HostID: gid + 1, Size: maxGID - gid})
- }
-
- options.HostUIDMapping = false
- options.HostGIDMapping = false
- }
- // Simply ignore the setting and do not setup an inner namespace for root as it is a no-op
+ options.HostUIDMapping = false
+ options.HostGIDMapping = false
return &options, nil
}
--
cgit v1.2.3-54-g00ecf
From 88f1994ab9a0bf3a8df3c8f74a39cd1db27c2070 Mon Sep 17 00:00:00 2001
From: Giuseppe Scrivano <gscrivan@redhat.com>
Date: Fri, 24 Apr 2020 15:37:31 +0200
Subject: podman: assume user namespace if there are mappings
if some mappings are specified, assume there is a private user
namespace.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
---
cmd/podman/common/specgen.go | 7 ++++++-
pkg/namespaces/namespaces.go | 7 ++++++-
test/e2e/run_userns_test.go | 1 -
3 files changed, 12 insertions(+), 3 deletions(-)
(limited to 'pkg')
diff --git a/cmd/podman/common/specgen.go b/cmd/podman/common/specgen.go
index ce91e0b2e..ed45a6595 100644
--- a/cmd/podman/common/specgen.go
+++ b/cmd/podman/common/specgen.go
@@ -209,10 +209,15 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
}
}
- s.IDMappings, err = util.ParseIDMapping(ns.UsernsMode(c.UserNS), c.UIDMap, c.GIDMap, c.SubUIDName, c.SubGIDName)
+ userNS := ns.UsernsMode(c.UserNS)
+ s.IDMappings, err = util.ParseIDMapping(userNS, c.UIDMap, c.GIDMap, c.SubUIDName, c.SubGIDName)
if err != nil {
return err
}
+ // If some mappings are specified, assume a private user namespace
+ if userNS.IsDefaultValue() && (!s.IDMappings.HostUIDMapping || !s.IDMappings.HostGIDMapping) {
+ s.UserNS.NSMode = specgen.Private
+ }
s.Terminal = c.TTY
ep, err := ExposedPorts(c.Expose, c.Net.PublishPorts, c.PublishAll, nil)
diff --git a/pkg/namespaces/namespaces.go b/pkg/namespaces/namespaces.go
index 2cb3c3f20..2ffbde977 100644
--- a/pkg/namespaces/namespaces.go
+++ b/pkg/namespaces/namespaces.go
@@ -31,7 +31,7 @@ func (n CgroupMode) IsHost() bool {
// IsDefaultValue indicates whether the cgroup namespace has the default value.
func (n CgroupMode) IsDefaultValue() bool {
- return n == ""
+ return n == "" || n == defaultType
}
// IsNS indicates a cgroup namespace passed in by path (ns:<path>)
@@ -102,6 +102,11 @@ func (n UsernsMode) IsAuto() bool {
return parts[0] == "auto"
}
+// IsDefaultValue indicates whether the user namespace has the default value.
+func (n UsernsMode) IsDefaultValue() bool {
+ return n == "" || n == defaultType
+}
+
// GetAutoOptions returns a AutoUserNsOptions with the settings to setup automatically
// a user namespace.
func (n UsernsMode) GetAutoOptions() (*storage.AutoUserNsOptions, error) {
diff --git a/test/e2e/run_userns_test.go b/test/e2e/run_userns_test.go
index d4b4f9024..25f12ec2e 100644
--- a/test/e2e/run_userns_test.go
+++ b/test/e2e/run_userns_test.go
@@ -218,7 +218,6 @@ var _ = Describe("Podman UserNS support", func() {
})
It("podman --userns=container:CTR", func() {
- Skip(v2fail)
ctrName := "userns-ctr"
session := podmanTest.Podman([]string{"run", "-d", "--uidmap=0:0:1", "--uidmap=1:1:4998", "--name", ctrName, "alpine", "top"})
session.WaitWithDefaultTimeout()
--
cgit v1.2.3-54-g00ecf