mirror of https://github.com/containers/podman.git
407 lines
13 KiB
Go
407 lines
13 KiB
Go
package generate
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/containers/common/libimage"
|
|
"github.com/containers/common/libnetwork/types"
|
|
"github.com/containers/common/pkg/config"
|
|
"github.com/containers/podman/v4/libpod"
|
|
"github.com/containers/podman/v4/libpod/define"
|
|
"github.com/containers/podman/v4/pkg/namespaces"
|
|
"github.com/containers/podman/v4/pkg/rootless"
|
|
"github.com/containers/podman/v4/pkg/specgen"
|
|
"github.com/containers/podman/v4/pkg/util"
|
|
spec "github.com/opencontainers/runtime-spec/specs-go"
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
const host = "host"
|
|
|
|
// Get the default namespace mode for any given namespace type.
|
|
func GetDefaultNamespaceMode(nsType string, cfg *config.Config, pod *libpod.Pod) (specgen.Namespace, error) {
|
|
// The default for most is private
|
|
toReturn := specgen.Namespace{}
|
|
toReturn.NSMode = specgen.Private
|
|
|
|
// Ensure case insensitivity
|
|
nsType = strings.ToLower(nsType)
|
|
|
|
// If the pod is not nil - check shared namespaces
|
|
if pod != nil && pod.HasInfraContainer() {
|
|
podMode := false
|
|
switch {
|
|
case nsType == "pid" && pod.SharesPID():
|
|
if pod.NamespaceMode(spec.PIDNamespace) == host {
|
|
toReturn.NSMode = specgen.Host
|
|
return toReturn, nil
|
|
}
|
|
podMode = true
|
|
case nsType == "ipc" && pod.SharesIPC():
|
|
if pod.NamespaceMode(spec.IPCNamespace) == host {
|
|
toReturn.NSMode = specgen.Host
|
|
return toReturn, nil
|
|
}
|
|
podMode = true
|
|
case nsType == "uts" && pod.SharesUTS():
|
|
if pod.NamespaceMode(spec.UTSNamespace) == host {
|
|
toReturn.NSMode = specgen.Host
|
|
return toReturn, nil
|
|
}
|
|
podMode = true
|
|
case nsType == "user" && pod.SharesUser():
|
|
// user does not need a special check for host, this is already validated on pod creation
|
|
// if --userns=host then pod.SharesUser == false
|
|
podMode = true
|
|
case nsType == "net" && pod.SharesNet():
|
|
if pod.NetworkMode() == host {
|
|
toReturn.NSMode = specgen.Host
|
|
return toReturn, nil
|
|
}
|
|
podMode = true
|
|
case nsType == "cgroup" && pod.SharesCgroup():
|
|
if pod.NamespaceMode(spec.CgroupNamespace) == host {
|
|
toReturn.NSMode = specgen.Host
|
|
return toReturn, nil
|
|
}
|
|
podMode = true
|
|
}
|
|
if podMode {
|
|
toReturn.NSMode = specgen.FromPod
|
|
return toReturn, nil
|
|
}
|
|
}
|
|
|
|
if cfg == nil {
|
|
cfg = &config.Config{}
|
|
}
|
|
switch nsType {
|
|
case "pid":
|
|
return specgen.ParseNamespace(cfg.Containers.PidNS)
|
|
case "ipc":
|
|
return specgen.ParseIPCNamespace(cfg.Containers.IPCNS)
|
|
case "uts":
|
|
return specgen.ParseNamespace(cfg.Containers.UTSNS)
|
|
case "user":
|
|
return specgen.ParseUserNamespace(cfg.Containers.UserNS)
|
|
case "cgroup":
|
|
return specgen.ParseCgroupNamespace(cfg.Containers.CgroupNS)
|
|
case "net":
|
|
ns, _, _, err := specgen.ParseNetworkFlag(nil, false)
|
|
return ns, err
|
|
}
|
|
|
|
return toReturn, fmt.Errorf("invalid namespace type %q passed: %w", nsType, define.ErrInvalidArg)
|
|
}
|
|
|
|
// namespaceOptions generates container creation options for all
|
|
// namespaces in a SpecGenerator.
|
|
// Pod is the pod the container will join. May be nil is the container is not
|
|
// joining a pod.
|
|
// TODO: Consider grouping options that are not directly attached to a namespace
|
|
// elsewhere.
|
|
func namespaceOptions(s *specgen.SpecGenerator, rt *libpod.Runtime, pod *libpod.Pod, imageData *libimage.ImageData) ([]libpod.CtrCreateOption, error) {
|
|
toReturn := []libpod.CtrCreateOption{}
|
|
|
|
// If pod is not nil, get infra container.
|
|
var infraCtr *libpod.Container
|
|
if pod != nil {
|
|
infraID, err := pod.InfraContainerID()
|
|
if err != nil {
|
|
// This is likely to be of the fatal kind (pod was
|
|
// removed) so hard fail
|
|
return nil, fmt.Errorf("looking up pod %s infra container: %w", pod.ID(), err)
|
|
}
|
|
if infraID != "" {
|
|
ctr, err := rt.GetContainer(infraID)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("retrieving pod %s infra container %s: %w", pod.ID(), infraID, err)
|
|
}
|
|
infraCtr = ctr
|
|
}
|
|
}
|
|
|
|
errNoInfra := fmt.Errorf("cannot use pod namespace as container is not joining a pod or pod has no infra container: %w", define.ErrInvalidArg)
|
|
|
|
// PID
|
|
switch s.PidNS.NSMode {
|
|
case specgen.FromPod:
|
|
if pod == nil || infraCtr == nil {
|
|
return nil, errNoInfra
|
|
}
|
|
toReturn = append(toReturn, libpod.WithPIDNSFrom(infraCtr))
|
|
case specgen.FromContainer:
|
|
pidCtr, err := rt.LookupContainer(s.PidNS.Value)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("looking up container to share pid namespace with: %w", err)
|
|
}
|
|
toReturn = append(toReturn, libpod.WithPIDNSFrom(pidCtr))
|
|
}
|
|
|
|
// IPC
|
|
switch s.IpcNS.NSMode {
|
|
case specgen.Host:
|
|
// Force use of host /dev/shm for host namespace
|
|
toReturn = append(toReturn, libpod.WithShmDir("/dev/shm"))
|
|
case specgen.FromPod:
|
|
if pod == nil || infraCtr == nil {
|
|
return nil, errNoInfra
|
|
}
|
|
toReturn = append(toReturn, libpod.WithIPCNSFrom(infraCtr))
|
|
toReturn = append(toReturn, libpod.WithShmDir(infraCtr.ShmDir()))
|
|
case specgen.FromContainer:
|
|
ipcCtr, err := rt.LookupContainer(s.IpcNS.Value)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("looking up container to share ipc namespace with: %w", err)
|
|
}
|
|
if ipcCtr.ConfigNoCopy().NoShmShare {
|
|
return nil, fmt.Errorf("joining IPC of container %s is not allowed: non-shareable IPC (hint: use IpcMode:shareable for the donor container)", ipcCtr.ID())
|
|
}
|
|
toReturn = append(toReturn, libpod.WithIPCNSFrom(ipcCtr))
|
|
if !ipcCtr.ConfigNoCopy().NoShm {
|
|
toReturn = append(toReturn, libpod.WithShmDir(ipcCtr.ShmDir()))
|
|
}
|
|
case specgen.None:
|
|
toReturn = append(toReturn, libpod.WithNoShm(true))
|
|
case specgen.Private:
|
|
toReturn = append(toReturn, libpod.WithNoShmShare(true))
|
|
}
|
|
|
|
// UTS
|
|
switch s.UtsNS.NSMode {
|
|
case specgen.FromPod:
|
|
if pod == nil || infraCtr == nil {
|
|
return nil, errNoInfra
|
|
}
|
|
if pod.NamespaceMode(spec.UTSNamespace) == host {
|
|
// adding infra as a nsCtr is not what we want to do when uts == host
|
|
// this leads the new ctr to try to add an ns path which is should not in this mode
|
|
logrus.Debug("pod has host uts, not adding infra as a nsCtr")
|
|
s.UtsNS = specgen.Namespace{NSMode: specgen.Host}
|
|
} else {
|
|
toReturn = append(toReturn, libpod.WithUTSNSFrom(infraCtr))
|
|
}
|
|
case specgen.FromContainer:
|
|
utsCtr, err := rt.LookupContainer(s.UtsNS.Value)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("looking up container to share uts namespace with: %w", err)
|
|
}
|
|
toReturn = append(toReturn, libpod.WithUTSNSFrom(utsCtr))
|
|
}
|
|
|
|
// User
|
|
switch s.UserNS.NSMode {
|
|
case specgen.KeepID:
|
|
if !rootless.IsRootless() {
|
|
return nil, errors.New("keep-id is only supported in rootless mode")
|
|
}
|
|
opts, err := namespaces.UsernsMode(s.UserNS.String()).GetKeepIDOptions()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if opts.UID == nil && opts.GID == nil {
|
|
toReturn = append(toReturn, libpod.WithAddCurrentUserPasswdEntry())
|
|
}
|
|
|
|
// If user is not overridden, set user in the container
|
|
// to user running Podman.
|
|
if s.User == "" {
|
|
_, uid, gid, err := util.GetKeepIDMapping(opts)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
toReturn = append(toReturn, libpod.WithUser(fmt.Sprintf("%d:%d", uid, gid)))
|
|
}
|
|
case specgen.FromPod:
|
|
if pod == nil || infraCtr == nil {
|
|
return nil, errNoInfra
|
|
}
|
|
// Inherit the user from the infra container if it is set and --user has not
|
|
// been set explicitly
|
|
if infraCtr.User() != "" && s.User == "" {
|
|
toReturn = append(toReturn, libpod.WithUser(infraCtr.User()))
|
|
}
|
|
toReturn = append(toReturn, libpod.WithUserNSFrom(infraCtr))
|
|
case specgen.FromContainer:
|
|
userCtr, err := rt.LookupContainer(s.UserNS.Value)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("looking up container to share user namespace with: %w", err)
|
|
}
|
|
toReturn = append(toReturn, libpod.WithUserNSFrom(userCtr))
|
|
}
|
|
|
|
// This wipes the UserNS settings that get set from the infra container
|
|
// when we are inheriting from the pod. So only apply this if the container
|
|
// is not being created in a pod.
|
|
if s.IDMappings != nil {
|
|
if pod == nil {
|
|
toReturn = append(toReturn, libpod.WithIDMappings(*s.IDMappings))
|
|
} else if pod.HasInfraContainer() && (len(s.IDMappings.UIDMap) > 0 || len(s.IDMappings.GIDMap) > 0) {
|
|
return nil, fmt.Errorf("cannot specify a new uid/gid map when entering a pod with an infra container: %w", define.ErrInvalidArg)
|
|
}
|
|
}
|
|
if s.User != "" {
|
|
toReturn = append(toReturn, libpod.WithUser(s.User))
|
|
}
|
|
if len(s.Groups) > 0 {
|
|
toReturn = append(toReturn, libpod.WithGroups(s.Groups))
|
|
}
|
|
|
|
// Cgroup
|
|
switch s.CgroupNS.NSMode {
|
|
case specgen.FromPod:
|
|
if pod == nil || infraCtr == nil {
|
|
return nil, errNoInfra
|
|
}
|
|
toReturn = append(toReturn, libpod.WithCgroupNSFrom(infraCtr))
|
|
case specgen.FromContainer:
|
|
cgroupCtr, err := rt.LookupContainer(s.CgroupNS.Value)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("looking up container to share cgroup namespace with: %w", err)
|
|
}
|
|
toReturn = append(toReturn, libpod.WithCgroupNSFrom(cgroupCtr))
|
|
}
|
|
|
|
if s.CgroupParent != "" {
|
|
toReturn = append(toReturn, libpod.WithCgroupParent(s.CgroupParent))
|
|
}
|
|
|
|
if s.CgroupsMode != "" {
|
|
toReturn = append(toReturn, libpod.WithCgroupsMode(s.CgroupsMode))
|
|
}
|
|
|
|
postConfigureNetNS := !s.UserNS.IsHost()
|
|
// when we are rootless we default to slirp4netns
|
|
if rootless.IsRootless() && (s.NetNS.IsPrivate() || s.NetNS.IsDefault()) {
|
|
s.NetNS.NSMode = specgen.Slirp
|
|
}
|
|
|
|
switch s.NetNS.NSMode {
|
|
case specgen.FromPod:
|
|
if pod == nil || infraCtr == nil {
|
|
return nil, errNoInfra
|
|
}
|
|
toReturn = append(toReturn, libpod.WithNetNSFrom(infraCtr))
|
|
case specgen.FromContainer:
|
|
netCtr, err := rt.LookupContainer(s.NetNS.Value)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("looking up container to share net namespace with: %w", err)
|
|
}
|
|
toReturn = append(toReturn, libpod.WithNetNSFrom(netCtr))
|
|
case specgen.Slirp:
|
|
portMappings, expose, err := createPortMappings(s, imageData)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
val := "slirp4netns"
|
|
if s.NetNS.Value != "" {
|
|
val = fmt.Sprintf("slirp4netns:%s", s.NetNS.Value)
|
|
}
|
|
toReturn = append(toReturn, libpod.WithNetNS(portMappings, expose, postConfigureNetNS, val, nil))
|
|
case specgen.Pasta:
|
|
portMappings, expose, err := createPortMappings(s, imageData)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
val := "pasta"
|
|
toReturn = append(toReturn, libpod.WithNetNS(portMappings, expose, postConfigureNetNS, val, nil))
|
|
case specgen.Bridge, specgen.Private, specgen.Default:
|
|
portMappings, expose, err := createPortMappings(s, imageData)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rtConfig, err := rt.GetConfigNoCopy()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// if no network was specified use add the default
|
|
if len(s.Networks) == 0 {
|
|
// backwards config still allow the old cni networks list and convert to new format
|
|
if len(s.CNINetworks) > 0 {
|
|
logrus.Warn(`specgen "cni_networks" option is deprecated use the "networks" map instead`)
|
|
networks := make(map[string]types.PerNetworkOptions, len(s.CNINetworks))
|
|
for _, net := range s.CNINetworks {
|
|
networks[net] = types.PerNetworkOptions{}
|
|
}
|
|
s.Networks = networks
|
|
} else {
|
|
// no networks given but bridge is set so use default network
|
|
s.Networks = map[string]types.PerNetworkOptions{
|
|
rtConfig.Network.DefaultNetwork: {},
|
|
}
|
|
}
|
|
}
|
|
// rename the "default" network to the correct default name
|
|
if opts, ok := s.Networks["default"]; ok {
|
|
s.Networks[rtConfig.Network.DefaultNetwork] = opts
|
|
delete(s.Networks, "default")
|
|
}
|
|
toReturn = append(toReturn, libpod.WithNetNS(portMappings, expose, postConfigureNetNS, "bridge", s.Networks))
|
|
}
|
|
|
|
if s.UseImageHosts {
|
|
toReturn = append(toReturn, libpod.WithUseImageHosts())
|
|
} else if len(s.HostAdd) > 0 {
|
|
toReturn = append(toReturn, libpod.WithHosts(s.HostAdd))
|
|
}
|
|
if len(s.DNSSearch) > 0 {
|
|
toReturn = append(toReturn, libpod.WithDNSSearch(s.DNSSearch))
|
|
}
|
|
if s.UseImageResolvConf {
|
|
toReturn = append(toReturn, libpod.WithUseImageResolvConf())
|
|
} else if len(s.DNSServers) > 0 {
|
|
var dnsServers []string
|
|
for _, d := range s.DNSServers {
|
|
dnsServers = append(dnsServers, d.String())
|
|
}
|
|
toReturn = append(toReturn, libpod.WithDNS(dnsServers))
|
|
}
|
|
if len(s.DNSOptions) > 0 {
|
|
toReturn = append(toReturn, libpod.WithDNSOption(s.DNSOptions))
|
|
}
|
|
if s.NetworkOptions != nil {
|
|
toReturn = append(toReturn, libpod.WithNetworkOptions(s.NetworkOptions))
|
|
}
|
|
|
|
return toReturn, nil
|
|
}
|
|
|
|
// GetNamespaceOptions transforms a slice of kernel namespaces
|
|
// into a slice of pod create options. Currently, not all
|
|
// kernel namespaces are supported, and they will be returned in an error
|
|
func GetNamespaceOptions(ns []string, netnsIsHost bool) ([]libpod.PodCreateOption, error) {
|
|
var options []libpod.PodCreateOption
|
|
var erroredOptions []libpod.PodCreateOption
|
|
if ns == nil {
|
|
// set the default namespaces
|
|
ns = strings.Split(specgen.DefaultKernelNamespaces, ",")
|
|
}
|
|
for _, toShare := range ns {
|
|
switch toShare {
|
|
case "cgroup":
|
|
options = append(options, libpod.WithPodCgroup())
|
|
case "net":
|
|
options = append(options, libpod.WithPodNet())
|
|
case "mnt":
|
|
return erroredOptions, fmt.Errorf("mount sharing functionality not supported on pod level")
|
|
case "pid":
|
|
options = append(options, libpod.WithPodPID())
|
|
case "user":
|
|
continue
|
|
case "ipc":
|
|
options = append(options, libpod.WithPodIPC())
|
|
case "uts":
|
|
options = append(options, libpod.WithPodUTS())
|
|
case "":
|
|
case "none":
|
|
return erroredOptions, nil
|
|
default:
|
|
return erroredOptions, fmt.Errorf("invalid kernel namespace to share: %s. Options are: cgroup, ipc, net, pid, uts or none", toShare)
|
|
}
|
|
}
|
|
return options, nil
|
|
}
|