554 lines
16 KiB
Go
554 lines
16 KiB
Go
package specgen
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import (
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"errors"
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"fmt"
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"net"
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"os"
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"strings"
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"github.com/containers/common/libnetwork/types"
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"github.com/containers/common/pkg/cgroups"
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cutil "github.com/containers/common/pkg/util"
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"github.com/containers/podman/v4/libpod/define"
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"github.com/containers/podman/v4/pkg/namespaces"
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"github.com/containers/podman/v4/pkg/util"
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"github.com/containers/storage"
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spec "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/opencontainers/runtime-tools/generate"
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)
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type NamespaceMode string
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const (
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// Default indicates the spec generator should determine
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// a sane default
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Default NamespaceMode = "default"
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// Host means the the namespace is derived from
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// the host
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Host NamespaceMode = "host"
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// Path is the path to a namespace
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Path NamespaceMode = "path"
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// FromContainer means namespace is derived from a
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// different container
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FromContainer NamespaceMode = "container"
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// FromPod indicates the namespace is derived from a pod
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FromPod NamespaceMode = "pod"
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// Private indicates the namespace is private
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Private NamespaceMode = "private"
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// Shareable indicates the namespace is shareable
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Shareable NamespaceMode = "shareable"
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// None indicates the IPC namespace is created without mounting /dev/shm
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None NamespaceMode = "none"
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// NoNetwork indicates no network namespace should
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// be joined. loopback should still exists.
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// Only used with the network namespace, invalid otherwise.
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NoNetwork NamespaceMode = "none"
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// Bridge indicates that a CNI network stack
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// should be used.
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// Only used with the network namespace, invalid otherwise.
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Bridge NamespaceMode = "bridge"
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// Slirp indicates that a slirp4netns network stack should
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// be used.
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// Only used with the network namespace, invalid otherwise.
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Slirp NamespaceMode = "slirp4netns"
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// KeepId indicates a user namespace to keep the owner uid inside
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// of the namespace itself.
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// Only used with the user namespace, invalid otherwise.
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KeepID NamespaceMode = "keep-id"
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// NoMap indicates a user namespace to keep the owner uid out
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// of the namespace itself.
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// Only used with the user namespace, invalid otherwise.
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NoMap NamespaceMode = "no-map"
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// Auto indicates to automatically create a user namespace.
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// Only used with the user namespace, invalid otherwise.
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Auto NamespaceMode = "auto"
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// DefaultKernelNamespaces is a comma-separated list of default kernel
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// namespaces.
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DefaultKernelNamespaces = "ipc,net,uts"
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)
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// Namespace describes the namespace
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type Namespace struct {
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NSMode NamespaceMode `json:"nsmode,omitempty"`
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Value string `json:"value,omitempty"`
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}
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// IsDefault returns whether the namespace is set to the default setting (which
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// also includes the empty string).
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func (n *Namespace) IsDefault() bool {
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return n.NSMode == Default || n.NSMode == ""
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}
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// IsHost returns a bool if the namespace is host based
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func (n *Namespace) IsHost() bool {
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return n.NSMode == Host
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}
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// IsNone returns a bool if the namespace is set to none
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func (n *Namespace) IsNone() bool {
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return n.NSMode == None
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}
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// IsBridge returns a bool if the namespace is a Bridge
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func (n *Namespace) IsBridge() bool {
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return n.NSMode == Bridge
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}
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// IsPath indicates via bool if the namespace is based on a path
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func (n *Namespace) IsPath() bool {
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return n.NSMode == Path
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}
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// IsContainer indicates via bool if the namespace is based on a container
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func (n *Namespace) IsContainer() bool {
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return n.NSMode == FromContainer
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}
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// IsPod indicates via bool if the namespace is based on a pod
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func (n *Namespace) IsPod() bool {
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return n.NSMode == FromPod
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}
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// IsPrivate indicates the namespace is private
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func (n *Namespace) IsPrivate() bool {
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return n.NSMode == Private
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}
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// IsAuto indicates the namespace is auto
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func (n *Namespace) IsAuto() bool {
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return n.NSMode == Auto
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}
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// IsKeepID indicates the namespace is KeepID
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func (n *Namespace) IsKeepID() bool {
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return n.NSMode == KeepID
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}
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// IsNoMap indicates the namespace is NoMap
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func (n *Namespace) IsNoMap() bool {
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return n.NSMode == NoMap
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}
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func (n *Namespace) String() string {
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if n.Value != "" {
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return fmt.Sprintf("%s:%s", n.NSMode, n.Value)
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}
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return string(n.NSMode)
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}
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func validateUserNS(n *Namespace) error {
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if n == nil {
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return nil
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}
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switch n.NSMode {
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case Auto, KeepID, NoMap:
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return nil
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}
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return n.validate()
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}
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func validateNetNS(n *Namespace) error {
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if n == nil {
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return nil
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}
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switch n.NSMode {
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case Slirp:
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break
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case "", Default, Host, Path, FromContainer, FromPod, Private, NoNetwork, Bridge:
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break
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default:
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return fmt.Errorf("invalid network %q", n.NSMode)
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}
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// Path and From Container MUST have a string value set
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if n.NSMode == Path || n.NSMode == FromContainer {
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if len(n.Value) < 1 {
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return fmt.Errorf("namespace mode %s requires a value", n.NSMode)
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}
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} else if n.NSMode != Slirp {
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// All others except must NOT set a string value
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if len(n.Value) > 0 {
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return fmt.Errorf("namespace value %s cannot be provided with namespace mode %s", n.Value, n.NSMode)
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}
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}
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return nil
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}
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func validateIPCNS(n *Namespace) error {
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if n == nil {
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return nil
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}
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switch n.NSMode {
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case Shareable, None:
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return nil
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}
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return n.validate()
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}
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// Validate perform simple validation on the namespace to make sure it is not
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// invalid from the get-go
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func (n *Namespace) validate() error {
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if n == nil {
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return nil
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}
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switch n.NSMode {
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case "", Default, Host, Path, FromContainer, FromPod, Private:
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// Valid, do nothing
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case NoNetwork, Bridge, Slirp:
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return errors.New("cannot use network modes with non-network namespace")
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default:
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return fmt.Errorf("invalid namespace type %s specified", n.NSMode)
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}
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// Path and From Container MUST have a string value set
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if n.NSMode == Path || n.NSMode == FromContainer {
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if len(n.Value) < 1 {
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return fmt.Errorf("namespace mode %s requires a value", n.NSMode)
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}
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} else {
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// All others must NOT set a string value
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if len(n.Value) > 0 {
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return fmt.Errorf("namespace value %s cannot be provided with namespace mode %s", n.Value, n.NSMode)
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}
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}
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return nil
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}
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// ParseNamespace parses a namespace in string form.
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// This is not intended for the network namespace, which has a separate
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// function.
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func ParseNamespace(ns string) (Namespace, error) {
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toReturn := Namespace{}
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switch {
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case ns == "pod":
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toReturn.NSMode = FromPod
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case ns == "host":
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toReturn.NSMode = Host
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case ns == "private", ns == "":
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toReturn.NSMode = Private
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case strings.HasPrefix(ns, "ns:"):
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split := strings.SplitN(ns, ":", 2)
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if len(split) != 2 {
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return toReturn, fmt.Errorf("must provide a path to a namespace when specifying \"ns:\"")
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}
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toReturn.NSMode = Path
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toReturn.Value = split[1]
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case strings.HasPrefix(ns, "container:"):
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split := strings.SplitN(ns, ":", 2)
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if len(split) != 2 {
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return toReturn, fmt.Errorf("must provide name or ID or a container when specifying \"container:\"")
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}
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toReturn.NSMode = FromContainer
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toReturn.Value = split[1]
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default:
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return toReturn, fmt.Errorf("unrecognized namespace mode %s passed", ns)
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}
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return toReturn, nil
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}
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// ParseCgroupNamespace parses a cgroup namespace specification in string
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// form.
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func ParseCgroupNamespace(ns string) (Namespace, error) {
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toReturn := Namespace{}
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// Cgroup is host for v1, private for v2.
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// We can't trust c/common for this, as it only assumes private.
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cgroupsv2, err := cgroups.IsCgroup2UnifiedMode()
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if err != nil {
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return toReturn, err
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}
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if cgroupsv2 {
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switch ns {
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case "host":
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toReturn.NSMode = Host
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case "private", "":
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toReturn.NSMode = Private
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default:
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return toReturn, fmt.Errorf("unrecognized cgroup namespace mode %s passed", ns)
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}
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} else {
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toReturn.NSMode = Host
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}
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return toReturn, nil
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}
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// ParseIPCNamespace parses a ipc namespace specification in string
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// form.
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func ParseIPCNamespace(ns string) (Namespace, error) {
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toReturn := Namespace{}
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switch {
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case ns == "shareable", ns == "":
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toReturn.NSMode = Shareable
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return toReturn, nil
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case ns == "none":
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toReturn.NSMode = None
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return toReturn, nil
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}
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return ParseNamespace(ns)
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}
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// ParseUserNamespace parses a user namespace specification in string
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// form.
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func ParseUserNamespace(ns string) (Namespace, error) {
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toReturn := Namespace{}
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switch {
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case ns == "auto":
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toReturn.NSMode = Auto
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return toReturn, nil
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case strings.HasPrefix(ns, "auto:"):
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split := strings.SplitN(ns, ":", 2)
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if len(split) != 2 {
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return toReturn, errors.New("invalid setting for auto: mode")
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}
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toReturn.NSMode = Auto
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toReturn.Value = split[1]
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return toReturn, nil
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case ns == "keep-id":
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toReturn.NSMode = KeepID
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return toReturn, nil
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case strings.HasPrefix(ns, "keep-id:"):
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split := strings.SplitN(ns, ":", 2)
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if len(split) != 2 {
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return toReturn, errors.New("invalid setting for keep-id: mode")
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}
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toReturn.NSMode = KeepID
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toReturn.Value = split[1]
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return toReturn, nil
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case ns == "nomap":
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toReturn.NSMode = NoMap
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return toReturn, nil
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case ns == "":
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toReturn.NSMode = Host
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return toReturn, nil
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}
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return ParseNamespace(ns)
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}
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// ParseNetworkFlag parses a network string slice into the network options
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// If the input is nil or empty it will use the default setting from containers.conf
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func ParseNetworkFlag(networks []string) (Namespace, map[string]types.PerNetworkOptions, map[string][]string, error) {
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var networkOptions map[string][]string
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// by default we try to use the containers.conf setting
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// if we get at least one value use this instead
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ns := containerConfig.Containers.NetNS
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if len(networks) > 0 {
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ns = networks[0]
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}
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toReturn := Namespace{}
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podmanNetworks := make(map[string]types.PerNetworkOptions)
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switch {
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case ns == string(Slirp), strings.HasPrefix(ns, string(Slirp)+":"):
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parts := strings.SplitN(ns, ":", 2)
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if len(parts) > 1 {
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networkOptions = make(map[string][]string)
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networkOptions[parts[0]] = strings.Split(parts[1], ",")
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}
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toReturn.NSMode = Slirp
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case ns == string(FromPod):
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toReturn.NSMode = FromPod
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case ns == "" || ns == string(Default) || ns == string(Private):
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toReturn.NSMode = Private
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case ns == string(Bridge), strings.HasPrefix(ns, string(Bridge)+":"):
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toReturn.NSMode = Bridge
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parts := strings.SplitN(ns, ":", 2)
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netOpts := types.PerNetworkOptions{}
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if len(parts) > 1 {
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var err error
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netOpts, err = parseBridgeNetworkOptions(parts[1])
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if err != nil {
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return toReturn, nil, nil, err
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}
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}
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// we have to set the special default network name here
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podmanNetworks["default"] = netOpts
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case ns == string(NoNetwork):
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toReturn.NSMode = NoNetwork
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case ns == string(Host):
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toReturn.NSMode = Host
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case strings.HasPrefix(ns, "ns:"):
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split := strings.SplitN(ns, ":", 2)
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if len(split) != 2 {
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return toReturn, nil, nil, errors.New("must provide a path to a namespace when specifying \"ns:\"")
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}
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toReturn.NSMode = Path
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toReturn.Value = split[1]
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case strings.HasPrefix(ns, string(FromContainer)+":"):
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split := strings.SplitN(ns, ":", 2)
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if len(split) != 2 {
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return toReturn, nil, nil, errors.New("must provide name or ID or a container when specifying \"container:\"")
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}
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toReturn.NSMode = FromContainer
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toReturn.Value = split[1]
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default:
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// we should have a normal network
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parts := strings.SplitN(ns, ":", 2)
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if len(parts) == 1 {
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// Assume we have been given a comma separated list of networks for backwards compat.
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networkList := strings.Split(ns, ",")
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for _, net := range networkList {
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podmanNetworks[net] = types.PerNetworkOptions{}
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}
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} else {
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if parts[0] == "" {
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return toReturn, nil, nil, errors.New("network name cannot be empty")
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}
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netOpts, err := parseBridgeNetworkOptions(parts[1])
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if err != nil {
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return toReturn, nil, nil, fmt.Errorf("invalid option for network %s: %w", parts[0], err)
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}
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podmanNetworks[parts[0]] = netOpts
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}
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// networks need bridge mode
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toReturn.NSMode = Bridge
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}
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if len(networks) > 1 {
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if !toReturn.IsBridge() {
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return toReturn, nil, nil, fmt.Errorf("cannot set multiple networks without bridge network mode, selected mode %s: %w", toReturn.NSMode, define.ErrInvalidArg)
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}
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for _, network := range networks[1:] {
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parts := strings.SplitN(network, ":", 2)
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if parts[0] == "" {
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return toReturn, nil, nil, fmt.Errorf("network name cannot be empty: %w", define.ErrInvalidArg)
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}
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if cutil.StringInSlice(parts[0], []string{string(Bridge), string(Slirp), string(FromPod), string(NoNetwork),
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string(Default), string(Private), string(Path), string(FromContainer), string(Host)}) {
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return toReturn, nil, nil, fmt.Errorf("can only set extra network names, selected mode %s conflicts with bridge: %w", parts[0], define.ErrInvalidArg)
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}
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netOpts := types.PerNetworkOptions{}
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if len(parts) > 1 {
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var err error
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netOpts, err = parseBridgeNetworkOptions(parts[1])
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if err != nil {
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return toReturn, nil, nil, fmt.Errorf("invalid option for network %s: %w", parts[0], err)
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}
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}
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podmanNetworks[parts[0]] = netOpts
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}
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}
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return toReturn, podmanNetworks, networkOptions, nil
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}
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func parseBridgeNetworkOptions(opts string) (types.PerNetworkOptions, error) {
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netOpts := types.PerNetworkOptions{}
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if len(opts) == 0 {
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return netOpts, nil
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}
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allopts := strings.Split(opts, ",")
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for _, opt := range allopts {
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split := strings.SplitN(opt, "=", 2)
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switch split[0] {
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case "ip", "ip6":
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ip := net.ParseIP(split[1])
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if ip == nil {
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return netOpts, fmt.Errorf("invalid ip address %q", split[1])
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}
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netOpts.StaticIPs = append(netOpts.StaticIPs, ip)
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case "mac":
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mac, err := net.ParseMAC(split[1])
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if err != nil {
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return netOpts, err
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}
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netOpts.StaticMAC = types.HardwareAddr(mac)
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case "alias":
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if split[1] == "" {
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return netOpts, errors.New("alias cannot be empty")
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}
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netOpts.Aliases = append(netOpts.Aliases, split[1])
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case "interface_name":
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if split[1] == "" {
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return netOpts, errors.New("interface_name cannot be empty")
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}
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netOpts.InterfaceName = split[1]
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default:
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return netOpts, fmt.Errorf("unknown bridge network option: %s", split[0])
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}
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}
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return netOpts, nil
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}
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func SetupUserNS(idmappings *storage.IDMappingOptions, userns Namespace, g *generate.Generator) (string, error) {
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// User
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var user string
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switch userns.NSMode {
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case Path:
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if _, err := os.Stat(userns.Value); err != nil {
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return user, fmt.Errorf("cannot find specified user namespace path: %w", err)
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}
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if err := g.AddOrReplaceLinuxNamespace(string(spec.UserNamespace), userns.Value); err != nil {
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return user, err
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}
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// runc complains if no mapping is specified, even if we join another ns. So provide a dummy mapping
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g.AddLinuxUIDMapping(uint32(0), uint32(0), uint32(1))
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g.AddLinuxGIDMapping(uint32(0), uint32(0), uint32(1))
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case Host:
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if err := g.RemoveLinuxNamespace(string(spec.UserNamespace)); err != nil {
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return user, err
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}
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case KeepID:
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opts, err := namespaces.UsernsMode(userns.String()).GetKeepIDOptions()
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if err != nil {
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return user, err
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}
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mappings, uid, gid, err := util.GetKeepIDMapping(opts)
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if err != nil {
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return user, err
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}
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idmappings = mappings
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g.SetProcessUID(uint32(uid))
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g.SetProcessGID(uint32(gid))
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g.AddProcessAdditionalGid(uint32(gid))
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user = fmt.Sprintf("%d:%d", uid, gid)
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if err := privateUserNamespace(idmappings, g); err != nil {
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return user, err
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}
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case NoMap:
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mappings, uid, gid, err := util.GetNoMapMapping()
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if err != nil {
|
|
return user, err
|
|
}
|
|
idmappings = mappings
|
|
g.SetProcessUID(uint32(uid))
|
|
g.SetProcessGID(uint32(gid))
|
|
g.AddProcessAdditionalGid(uint32(gid))
|
|
user = fmt.Sprintf("%d:%d", uid, gid)
|
|
if err := privateUserNamespace(idmappings, g); err != nil {
|
|
return user, err
|
|
}
|
|
case Private:
|
|
if err := privateUserNamespace(idmappings, g); err != nil {
|
|
return user, err
|
|
}
|
|
}
|
|
return user, nil
|
|
}
|
|
|
|
func privateUserNamespace(idmappings *storage.IDMappingOptions, g *generate.Generator) error {
|
|
if err := g.AddOrReplaceLinuxNamespace(string(spec.UserNamespace), ""); err != nil {
|
|
return err
|
|
}
|
|
if idmappings == nil || (len(idmappings.UIDMap) == 0 && len(idmappings.GIDMap) == 0) {
|
|
return errors.New("must provide at least one UID or GID mapping to configure a user namespace")
|
|
}
|
|
for _, uidmap := range idmappings.UIDMap {
|
|
g.AddLinuxUIDMapping(uint32(uidmap.HostID), uint32(uidmap.ContainerID), uint32(uidmap.Size))
|
|
}
|
|
for _, gidmap := range idmappings.GIDMap {
|
|
g.AddLinuxGIDMapping(uint32(gidmap.HostID), uint32(gidmap.ContainerID), uint32(gidmap.Size))
|
|
}
|
|
return nil
|
|
}
|