764 lines
19 KiB
Go
764 lines
19 KiB
Go
// +build linux
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// Package specconv implements conversion of specifications to libcontainer
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// configurations
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package specconv
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"time"
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"github.com/opencontainers/runc/libcontainer/configs"
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"github.com/opencontainers/runc/libcontainer/seccomp"
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libcontainerUtils "github.com/opencontainers/runc/libcontainer/utils"
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"github.com/opencontainers/runtime-spec/specs-go"
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)
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const wildcard = -1
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var namespaceMapping = map[specs.LinuxNamespaceType]configs.NamespaceType{
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specs.PIDNamespace: configs.NEWPID,
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specs.NetworkNamespace: configs.NEWNET,
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specs.MountNamespace: configs.NEWNS,
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specs.UserNamespace: configs.NEWUSER,
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specs.IPCNamespace: configs.NEWIPC,
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specs.UTSNamespace: configs.NEWUTS,
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}
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var mountPropagationMapping = map[string]int{
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"rprivate": syscall.MS_PRIVATE | syscall.MS_REC,
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"private": syscall.MS_PRIVATE,
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"rslave": syscall.MS_SLAVE | syscall.MS_REC,
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"slave": syscall.MS_SLAVE,
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"rshared": syscall.MS_SHARED | syscall.MS_REC,
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"shared": syscall.MS_SHARED,
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"": syscall.MS_PRIVATE | syscall.MS_REC,
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}
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var allowedDevices = []*configs.Device{
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// allow mknod for any device
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{
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Type: 'c',
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Major: wildcard,
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Minor: wildcard,
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Permissions: "m",
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Allow: true,
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},
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{
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Type: 'b',
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Major: wildcard,
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Minor: wildcard,
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Permissions: "m",
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Allow: true,
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},
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{
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Type: 'c',
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Path: "/dev/null",
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Major: 1,
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Minor: 3,
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Permissions: "rwm",
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Allow: true,
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},
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{
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Type: 'c',
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Path: "/dev/random",
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Major: 1,
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Minor: 8,
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Permissions: "rwm",
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Allow: true,
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},
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{
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Type: 'c',
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Path: "/dev/full",
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Major: 1,
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Minor: 7,
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Permissions: "rwm",
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Allow: true,
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},
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{
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Type: 'c',
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Path: "/dev/tty",
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Major: 5,
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Minor: 0,
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Permissions: "rwm",
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Allow: true,
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},
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{
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Type: 'c',
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Path: "/dev/zero",
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Major: 1,
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Minor: 5,
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Permissions: "rwm",
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Allow: true,
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},
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{
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Type: 'c',
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Path: "/dev/urandom",
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Major: 1,
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Minor: 9,
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Permissions: "rwm",
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Allow: true,
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},
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{
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Path: "/dev/console",
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Type: 'c',
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Major: 5,
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Minor: 1,
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Permissions: "rwm",
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Allow: true,
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},
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// /dev/pts/ - pts namespaces are "coming soon"
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{
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Path: "",
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Type: 'c',
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Major: 136,
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Minor: wildcard,
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Permissions: "rwm",
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Allow: true,
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},
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{
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Path: "",
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Type: 'c',
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Major: 5,
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Minor: 2,
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Permissions: "rwm",
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Allow: true,
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},
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// tuntap
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{
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Path: "",
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Type: 'c',
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Major: 10,
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Minor: 200,
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Permissions: "rwm",
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Allow: true,
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},
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}
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type CreateOpts struct {
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CgroupName string
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UseSystemdCgroup bool
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NoPivotRoot bool
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NoNewKeyring bool
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Spec *specs.Spec
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}
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// CreateLibcontainerConfig creates a new libcontainer configuration from a
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// given specification and a cgroup name
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func CreateLibcontainerConfig(opts *CreateOpts) (*configs.Config, error) {
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// runc's cwd will always be the bundle path
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rcwd, err := os.Getwd()
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if err != nil {
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return nil, err
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}
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cwd, err := filepath.Abs(rcwd)
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if err != nil {
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return nil, err
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}
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spec := opts.Spec
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rootfsPath := spec.Root.Path
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if !filepath.IsAbs(rootfsPath) {
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rootfsPath = filepath.Join(cwd, rootfsPath)
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}
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labels := []string{}
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for k, v := range spec.Annotations {
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labels = append(labels, fmt.Sprintf("%s=%s", k, v))
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}
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config := &configs.Config{
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Rootfs: rootfsPath,
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NoPivotRoot: opts.NoPivotRoot,
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Readonlyfs: spec.Root.Readonly,
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Hostname: spec.Hostname,
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Labels: append(labels, fmt.Sprintf("bundle=%s", cwd)),
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NoNewKeyring: opts.NoNewKeyring,
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}
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exists := false
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if config.RootPropagation, exists = mountPropagationMapping[spec.Linux.RootfsPropagation]; !exists {
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return nil, fmt.Errorf("rootfsPropagation=%v is not supported", spec.Linux.RootfsPropagation)
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}
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for _, ns := range spec.Linux.Namespaces {
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t, exists := namespaceMapping[ns.Type]
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if !exists {
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return nil, fmt.Errorf("namespace %q does not exist", ns)
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}
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if config.Namespaces.Contains(t) {
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return nil, fmt.Errorf("malformed spec file: duplicated ns %q", ns)
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}
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config.Namespaces.Add(t, ns.Path)
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}
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if config.Namespaces.Contains(configs.NEWNET) {
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config.Networks = []*configs.Network{
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{
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Type: "loopback",
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},
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}
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}
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for _, m := range spec.Mounts {
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config.Mounts = append(config.Mounts, createLibcontainerMount(cwd, m))
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}
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if err := createDevices(spec, config); err != nil {
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return nil, err
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}
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if err := setupUserNamespace(spec, config); err != nil {
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return nil, err
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}
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c, err := createCgroupConfig(opts.CgroupName, opts.UseSystemdCgroup, spec)
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if err != nil {
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return nil, err
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}
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config.Cgroups = c
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// set extra path masking for libcontainer for the various unsafe places in proc
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config.MaskPaths = spec.Linux.MaskedPaths
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config.ReadonlyPaths = spec.Linux.ReadonlyPaths
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if spec.Linux.Seccomp != nil {
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seccomp, err := setupSeccomp(spec.Linux.Seccomp)
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if err != nil {
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return nil, err
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}
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config.Seccomp = seccomp
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}
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if spec.Process.SelinuxLabel != "" {
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config.ProcessLabel = spec.Process.SelinuxLabel
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}
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config.Sysctl = spec.Linux.Sysctl
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if spec.Linux.Resources != nil && spec.Linux.Resources.OOMScoreAdj != nil {
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config.OomScoreAdj = *spec.Linux.Resources.OOMScoreAdj
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}
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createHooks(spec, config)
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config.MountLabel = spec.Linux.MountLabel
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config.Version = specs.Version
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return config, nil
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}
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func createLibcontainerMount(cwd string, m specs.Mount) *configs.Mount {
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flags, pgflags, data, ext := parseMountOptions(m.Options)
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source := m.Source
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if m.Type == "bind" {
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if !filepath.IsAbs(source) {
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source = filepath.Join(cwd, m.Source)
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}
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}
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return &configs.Mount{
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Device: m.Type,
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Source: source,
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Destination: m.Destination,
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Data: data,
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Flags: flags,
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PropagationFlags: pgflags,
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Extensions: ext,
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}
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}
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func createCgroupConfig(name string, useSystemdCgroup bool, spec *specs.Spec) (*configs.Cgroup, error) {
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var myCgroupPath string
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c := &configs.Cgroup{
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Resources: &configs.Resources{},
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}
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if spec.Linux != nil && spec.Linux.CgroupsPath != nil {
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myCgroupPath = libcontainerUtils.CleanPath(*spec.Linux.CgroupsPath)
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if useSystemdCgroup {
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myCgroupPath = *spec.Linux.CgroupsPath
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}
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}
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if useSystemdCgroup {
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if myCgroupPath == "" {
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c.Parent = "system.slice"
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c.ScopePrefix = "runc"
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c.Name = name
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} else {
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// Parse the path from expected "slice:prefix:name"
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// for e.g. "system.slice:docker:1234"
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parts := strings.Split(myCgroupPath, ":")
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if len(parts) != 3 {
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return nil, fmt.Errorf("expected cgroupsPath to be of format \"slice:prefix:name\" for systemd cgroups")
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}
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c.Parent = parts[0]
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c.ScopePrefix = parts[1]
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c.Name = parts[2]
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}
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} else {
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if myCgroupPath == "" {
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c.Name = name
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}
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c.Path = myCgroupPath
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}
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c.Resources.AllowedDevices = allowedDevices
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if spec.Linux == nil {
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return c, nil
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}
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r := spec.Linux.Resources
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if r == nil {
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return c, nil
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}
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for i, d := range spec.Linux.Resources.Devices {
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var (
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t = "a"
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major = int64(-1)
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minor = int64(-1)
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)
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if d.Type != nil {
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t = *d.Type
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}
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if d.Major != nil {
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major = *d.Major
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}
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if d.Minor != nil {
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minor = *d.Minor
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}
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if d.Access == nil || *d.Access == "" {
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return nil, fmt.Errorf("device access at %d field cannot be empty", i)
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}
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dt, err := stringToDeviceRune(t)
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if err != nil {
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return nil, err
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}
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dd := &configs.Device{
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Type: dt,
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Major: major,
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Minor: minor,
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Permissions: *d.Access,
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Allow: d.Allow,
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}
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c.Resources.Devices = append(c.Resources.Devices, dd)
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}
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// append the default allowed devices to the end of the list
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c.Resources.Devices = append(c.Resources.Devices, allowedDevices...)
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if r.Memory != nil {
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if r.Memory.Limit != nil {
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c.Resources.Memory = int64(*r.Memory.Limit)
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}
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if r.Memory.Reservation != nil {
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c.Resources.MemoryReservation = int64(*r.Memory.Reservation)
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}
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if r.Memory.Swap != nil {
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c.Resources.MemorySwap = int64(*r.Memory.Swap)
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}
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if r.Memory.Kernel != nil {
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c.Resources.KernelMemory = int64(*r.Memory.Kernel)
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}
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if r.Memory.KernelTCP != nil {
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c.Resources.KernelMemoryTCP = int64(*r.Memory.KernelTCP)
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}
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if r.Memory.Swappiness != nil {
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swappiness := int64(*r.Memory.Swappiness)
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c.Resources.MemorySwappiness = &swappiness
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}
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}
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if r.CPU != nil {
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if r.CPU.Shares != nil {
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c.Resources.CpuShares = int64(*r.CPU.Shares)
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}
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if r.CPU.Quota != nil {
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c.Resources.CpuQuota = int64(*r.CPU.Quota)
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}
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if r.CPU.Period != nil {
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c.Resources.CpuPeriod = int64(*r.CPU.Period)
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}
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if r.CPU.RealtimeRuntime != nil {
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c.Resources.CpuRtRuntime = int64(*r.CPU.RealtimeRuntime)
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}
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if r.CPU.RealtimePeriod != nil {
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c.Resources.CpuRtPeriod = int64(*r.CPU.RealtimePeriod)
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}
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if r.CPU.Cpus != nil {
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c.Resources.CpusetCpus = *r.CPU.Cpus
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}
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if r.CPU.Mems != nil {
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c.Resources.CpusetMems = *r.CPU.Mems
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}
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}
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if r.Pids != nil {
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c.Resources.PidsLimit = r.Pids.Limit
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}
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if r.BlockIO != nil {
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if r.BlockIO.Weight != nil {
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c.Resources.BlkioWeight = *r.BlockIO.Weight
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}
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if r.BlockIO.LeafWeight != nil {
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c.Resources.BlkioLeafWeight = *r.BlockIO.LeafWeight
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}
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if r.BlockIO.WeightDevice != nil {
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for _, wd := range r.BlockIO.WeightDevice {
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var weight, leafWeight uint16
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if wd.Weight != nil {
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weight = *wd.Weight
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}
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if wd.LeafWeight != nil {
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leafWeight = *wd.LeafWeight
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}
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weightDevice := configs.NewWeightDevice(wd.Major, wd.Minor, weight, leafWeight)
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c.Resources.BlkioWeightDevice = append(c.Resources.BlkioWeightDevice, weightDevice)
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}
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}
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if r.BlockIO.ThrottleReadBpsDevice != nil {
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for _, td := range r.BlockIO.ThrottleReadBpsDevice {
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rate := td.Rate
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throttleDevice := configs.NewThrottleDevice(td.Major, td.Minor, rate)
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c.Resources.BlkioThrottleReadBpsDevice = append(c.Resources.BlkioThrottleReadBpsDevice, throttleDevice)
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}
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}
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if r.BlockIO.ThrottleWriteBpsDevice != nil {
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for _, td := range r.BlockIO.ThrottleWriteBpsDevice {
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rate := td.Rate
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throttleDevice := configs.NewThrottleDevice(td.Major, td.Minor, rate)
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c.Resources.BlkioThrottleWriteBpsDevice = append(c.Resources.BlkioThrottleWriteBpsDevice, throttleDevice)
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}
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}
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if r.BlockIO.ThrottleReadIOPSDevice != nil {
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for _, td := range r.BlockIO.ThrottleReadIOPSDevice {
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rate := td.Rate
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throttleDevice := configs.NewThrottleDevice(td.Major, td.Minor, rate)
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c.Resources.BlkioThrottleReadIOPSDevice = append(c.Resources.BlkioThrottleReadIOPSDevice, throttleDevice)
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}
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}
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if r.BlockIO.ThrottleWriteIOPSDevice != nil {
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for _, td := range r.BlockIO.ThrottleWriteIOPSDevice {
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rate := td.Rate
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throttleDevice := configs.NewThrottleDevice(td.Major, td.Minor, rate)
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c.Resources.BlkioThrottleWriteIOPSDevice = append(c.Resources.BlkioThrottleWriteIOPSDevice, throttleDevice)
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}
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}
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}
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for _, l := range r.HugepageLimits {
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c.Resources.HugetlbLimit = append(c.Resources.HugetlbLimit, &configs.HugepageLimit{
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Pagesize: l.Pagesize,
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Limit: l.Limit,
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})
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}
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if r.DisableOOMKiller != nil {
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c.Resources.OomKillDisable = *r.DisableOOMKiller
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}
|
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if r.Network != nil {
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if r.Network.ClassID != nil {
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c.Resources.NetClsClassid = *r.Network.ClassID
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}
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for _, m := range r.Network.Priorities {
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c.Resources.NetPrioIfpriomap = append(c.Resources.NetPrioIfpriomap, &configs.IfPrioMap{
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Interface: m.Name,
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Priority: int64(m.Priority),
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})
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}
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}
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return c, nil
|
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}
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|
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func stringToDeviceRune(s string) (rune, error) {
|
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switch s {
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case "a":
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return 'a', nil
|
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case "b":
|
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return 'b', nil
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case "c":
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return 'c', nil
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default:
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return 0, fmt.Errorf("invalid device type %q", s)
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}
|
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}
|
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|
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func createDevices(spec *specs.Spec, config *configs.Config) error {
|
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// add whitelisted devices
|
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config.Devices = []*configs.Device{
|
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{
|
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Type: 'c',
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Path: "/dev/null",
|
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Major: 1,
|
|
Minor: 3,
|
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FileMode: 0666,
|
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Uid: 0,
|
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Gid: 0,
|
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},
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{
|
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Type: 'c',
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Path: "/dev/random",
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Major: 1,
|
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Minor: 8,
|
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FileMode: 0666,
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Uid: 0,
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Gid: 0,
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},
|
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{
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Type: 'c',
|
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Path: "/dev/full",
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Major: 1,
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Minor: 7,
|
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FileMode: 0666,
|
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Uid: 0,
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Gid: 0,
|
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},
|
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{
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Type: 'c',
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Path: "/dev/tty",
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Major: 5,
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Minor: 0,
|
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FileMode: 0666,
|
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Uid: 0,
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Gid: 0,
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},
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{
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Type: 'c',
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Path: "/dev/zero",
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Major: 1,
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Minor: 5,
|
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FileMode: 0666,
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Uid: 0,
|
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Gid: 0,
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},
|
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{
|
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Type: 'c',
|
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Path: "/dev/urandom",
|
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Major: 1,
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Minor: 9,
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FileMode: 0666,
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Uid: 0,
|
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Gid: 0,
|
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},
|
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}
|
|
// merge in additional devices from the spec
|
|
for _, d := range spec.Linux.Devices {
|
|
var uid, gid uint32
|
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var filemode os.FileMode = 0666
|
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|
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if d.UID != nil {
|
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uid = *d.UID
|
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}
|
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if d.GID != nil {
|
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gid = *d.GID
|
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}
|
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dt, err := stringToDeviceRune(d.Type)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if d.FileMode != nil {
|
|
filemode = *d.FileMode
|
|
}
|
|
device := &configs.Device{
|
|
Type: dt,
|
|
Path: d.Path,
|
|
Major: d.Major,
|
|
Minor: d.Minor,
|
|
FileMode: filemode,
|
|
Uid: uid,
|
|
Gid: gid,
|
|
}
|
|
config.Devices = append(config.Devices, device)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func setupUserNamespace(spec *specs.Spec, config *configs.Config) error {
|
|
if len(spec.Linux.UIDMappings) == 0 {
|
|
return nil
|
|
}
|
|
create := func(m specs.LinuxIDMapping) configs.IDMap {
|
|
return configs.IDMap{
|
|
HostID: int(m.HostID),
|
|
ContainerID: int(m.ContainerID),
|
|
Size: int(m.Size),
|
|
}
|
|
}
|
|
for _, m := range spec.Linux.UIDMappings {
|
|
config.UidMappings = append(config.UidMappings, create(m))
|
|
}
|
|
for _, m := range spec.Linux.GIDMappings {
|
|
config.GidMappings = append(config.GidMappings, create(m))
|
|
}
|
|
rootUID, err := config.HostUID()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
rootGID, err := config.HostGID()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, node := range config.Devices {
|
|
node.Uid = uint32(rootUID)
|
|
node.Gid = uint32(rootGID)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// parseMountOptions parses the string and returns the flags, propagation
|
|
// flags and any mount data that it contains.
|
|
func parseMountOptions(options []string) (int, []int, string, int) {
|
|
var (
|
|
flag int
|
|
pgflag []int
|
|
data []string
|
|
extFlags int
|
|
)
|
|
flags := map[string]struct {
|
|
clear bool
|
|
flag int
|
|
}{
|
|
"async": {true, syscall.MS_SYNCHRONOUS},
|
|
"atime": {true, syscall.MS_NOATIME},
|
|
"bind": {false, syscall.MS_BIND},
|
|
"defaults": {false, 0},
|
|
"dev": {true, syscall.MS_NODEV},
|
|
"diratime": {true, syscall.MS_NODIRATIME},
|
|
"dirsync": {false, syscall.MS_DIRSYNC},
|
|
"exec": {true, syscall.MS_NOEXEC},
|
|
"mand": {false, syscall.MS_MANDLOCK},
|
|
"noatime": {false, syscall.MS_NOATIME},
|
|
"nodev": {false, syscall.MS_NODEV},
|
|
"nodiratime": {false, syscall.MS_NODIRATIME},
|
|
"noexec": {false, syscall.MS_NOEXEC},
|
|
"nomand": {true, syscall.MS_MANDLOCK},
|
|
"norelatime": {true, syscall.MS_RELATIME},
|
|
"nostrictatime": {true, syscall.MS_STRICTATIME},
|
|
"nosuid": {false, syscall.MS_NOSUID},
|
|
"rbind": {false, syscall.MS_BIND | syscall.MS_REC},
|
|
"relatime": {false, syscall.MS_RELATIME},
|
|
"remount": {false, syscall.MS_REMOUNT},
|
|
"ro": {false, syscall.MS_RDONLY},
|
|
"rw": {true, syscall.MS_RDONLY},
|
|
"strictatime": {false, syscall.MS_STRICTATIME},
|
|
"suid": {true, syscall.MS_NOSUID},
|
|
"sync": {false, syscall.MS_SYNCHRONOUS},
|
|
}
|
|
propagationFlags := map[string]int{
|
|
"private": syscall.MS_PRIVATE,
|
|
"shared": syscall.MS_SHARED,
|
|
"slave": syscall.MS_SLAVE,
|
|
"unbindable": syscall.MS_UNBINDABLE,
|
|
"rprivate": syscall.MS_PRIVATE | syscall.MS_REC,
|
|
"rshared": syscall.MS_SHARED | syscall.MS_REC,
|
|
"rslave": syscall.MS_SLAVE | syscall.MS_REC,
|
|
"runbindable": syscall.MS_UNBINDABLE | syscall.MS_REC,
|
|
}
|
|
extensionFlags := map[string]struct {
|
|
clear bool
|
|
flag int
|
|
}{
|
|
"tmpcopyup": {false, configs.EXT_COPYUP},
|
|
}
|
|
for _, o := range options {
|
|
// If the option does not exist in the flags table or the flag
|
|
// is not supported on the platform,
|
|
// then it is a data value for a specific fs type
|
|
if f, exists := flags[o]; exists && f.flag != 0 {
|
|
if f.clear {
|
|
flag &= ^f.flag
|
|
} else {
|
|
flag |= f.flag
|
|
}
|
|
} else if f, exists := propagationFlags[o]; exists && f != 0 {
|
|
pgflag = append(pgflag, f)
|
|
} else if f, exists := extensionFlags[o]; exists && f.flag != 0 {
|
|
if f.clear {
|
|
extFlags &= ^f.flag
|
|
} else {
|
|
extFlags |= f.flag
|
|
}
|
|
} else {
|
|
data = append(data, o)
|
|
}
|
|
}
|
|
return flag, pgflag, strings.Join(data, ","), extFlags
|
|
}
|
|
|
|
func setupSeccomp(config *specs.LinuxSeccomp) (*configs.Seccomp, error) {
|
|
if config == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
// No default action specified, no syscalls listed, assume seccomp disabled
|
|
if config.DefaultAction == "" && len(config.Syscalls) == 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
newConfig := new(configs.Seccomp)
|
|
newConfig.Syscalls = []*configs.Syscall{}
|
|
|
|
if len(config.Architectures) > 0 {
|
|
newConfig.Architectures = []string{}
|
|
for _, arch := range config.Architectures {
|
|
newArch, err := seccomp.ConvertStringToArch(string(arch))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
newConfig.Architectures = append(newConfig.Architectures, newArch)
|
|
}
|
|
}
|
|
|
|
// Convert default action from string representation
|
|
newDefaultAction, err := seccomp.ConvertStringToAction(string(config.DefaultAction))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
newConfig.DefaultAction = newDefaultAction
|
|
|
|
// Loop through all syscall blocks and convert them to libcontainer format
|
|
for _, call := range config.Syscalls {
|
|
newAction, err := seccomp.ConvertStringToAction(string(call.Action))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
newCall := configs.Syscall{
|
|
Name: call.Name,
|
|
Action: newAction,
|
|
Args: []*configs.Arg{},
|
|
}
|
|
|
|
// Loop through all the arguments of the syscall and convert them
|
|
for _, arg := range call.Args {
|
|
newOp, err := seccomp.ConvertStringToOperator(string(arg.Op))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
newArg := configs.Arg{
|
|
Index: arg.Index,
|
|
Value: arg.Value,
|
|
ValueTwo: arg.ValueTwo,
|
|
Op: newOp,
|
|
}
|
|
|
|
newCall.Args = append(newCall.Args, &newArg)
|
|
}
|
|
|
|
newConfig.Syscalls = append(newConfig.Syscalls, &newCall)
|
|
}
|
|
|
|
return newConfig, nil
|
|
}
|
|
|
|
func createHooks(rspec *specs.Spec, config *configs.Config) {
|
|
config.Hooks = &configs.Hooks{}
|
|
for _, h := range rspec.Hooks.Prestart {
|
|
cmd := createCommandHook(h)
|
|
config.Hooks.Prestart = append(config.Hooks.Prestart, configs.NewCommandHook(cmd))
|
|
}
|
|
for _, h := range rspec.Hooks.Poststart {
|
|
cmd := createCommandHook(h)
|
|
config.Hooks.Poststart = append(config.Hooks.Poststart, configs.NewCommandHook(cmd))
|
|
}
|
|
for _, h := range rspec.Hooks.Poststop {
|
|
cmd := createCommandHook(h)
|
|
config.Hooks.Poststop = append(config.Hooks.Poststop, configs.NewCommandHook(cmd))
|
|
}
|
|
}
|
|
|
|
func createCommandHook(h specs.Hook) configs.Command {
|
|
cmd := configs.Command{
|
|
Path: h.Path,
|
|
Args: h.Args,
|
|
Env: h.Env,
|
|
}
|
|
if h.Timeout != nil {
|
|
d := time.Duration(*h.Timeout) * time.Second
|
|
cmd.Timeout = &d
|
|
}
|
|
return cmd
|
|
}
|