package main import ( "context" "encoding/json" "fmt" "os" "path/filepath" "strconv" "strings" "syscall" "github.com/containers/libpod/cmd/podman/libpodruntime" "github.com/containers/libpod/libpod" "github.com/containers/libpod/libpod/image" ann "github.com/containers/libpod/pkg/annotations" "github.com/containers/libpod/pkg/apparmor" "github.com/containers/libpod/pkg/inspect" ns "github.com/containers/libpod/pkg/namespaces" "github.com/containers/libpod/pkg/rootless" cc "github.com/containers/libpod/pkg/spec" "github.com/containers/libpod/pkg/util" libpodVersion "github.com/containers/libpod/version" "github.com/docker/docker/pkg/signal" "github.com/docker/go-connections/nat" "github.com/docker/go-units" "github.com/opencontainers/selinux/go-selinux/label" "github.com/pkg/errors" "github.com/sirupsen/logrus" "github.com/urfave/cli" ) var ( defaultEnvVariables = map[string]string{ "PATH": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "TERM": "xterm", } ) var createDescription = "Creates a new container from the given image or" + " storage and prepares it for running the specified command. The" + " container ID is then printed to stdout. You can then start it at" + " any time with the podman start command. The container" + " will be created with the initial state 'created'." var createCommand = cli.Command{ Name: "create", Usage: "Create but do not start a container", Description: createDescription, Flags: createFlags, Action: createCmd, ArgsUsage: "IMAGE [COMMAND [ARG...]]", HideHelp: true, SkipArgReorder: true, UseShortOptionHandling: true, OnUsageError: usageErrorHandler, } func createCmd(c *cli.Context) error { // TODO should allow user to create based off a directory on the host not just image // Need CLI support for this // Docker-compatibility: the "-h" flag for run/create is reserved for // the hostname (see https://github.com/containers/libpod/issues/1367). if c.Bool("help") { cli.ShowCommandHelpAndExit(c, "run", 0) } if err := validateFlags(c, createFlags); err != nil { return err } if c.String("cidfile") != "" { if _, err := os.Stat(c.String("cidfile")); err == nil { return errors.Errorf("container id file exists. ensure another container is not using it or delete %s", c.String("cidfile")) } if err := libpod.WriteFile("", c.String("cidfile")); err != nil { return errors.Wrapf(err, "unable to write cidfile %s", c.String("cidfile")) } } if len(c.Args()) < 1 { return errors.Errorf("image name or ID is required") } rootfs := "" if c.Bool("rootfs") { rootfs = c.Args()[0] } mappings, err := util.ParseIDMapping(c.StringSlice("uidmap"), c.StringSlice("gidmap"), c.String("subuidmap"), c.String("subgidmap")) if err != nil { return err } storageOpts, err := libpodruntime.GetDefaultStoreOptions() if err != nil { return err } storageOpts.UIDMap = mappings.UIDMap storageOpts.GIDMap = mappings.GIDMap if os.Geteuid() != 0 { rootless.SetSkipStorageSetup(true) } runtime, err := libpodruntime.GetRuntimeWithStorageOpts(c, &storageOpts) if err != nil { return errors.Wrapf(err, "error creating libpod runtime") } defer runtime.Shutdown(false) rtc := runtime.GetConfig() ctx := getContext() imageName := "" var data *inspect.ImageData = nil if rootfs == "" && !rootless.SkipStorageSetup() { newImage, err := runtime.ImageRuntime().New(ctx, c.Args()[0], rtc.SignaturePolicyPath, "", os.Stderr, nil, image.SigningOptions{}, false, false) if err != nil { return err } data, err = newImage.Inspect(ctx) imageName = newImage.Names()[0] } createConfig, err := parseCreateOpts(ctx, c, runtime, imageName, data) if err != nil { return err } runtimeSpec, err := cc.CreateConfigToOCISpec(createConfig) if err != nil { return err } options, err := createConfig.GetContainerCreateOptions(runtime) if err != nil { return err } became, ret, err := joinOrCreateRootlessUserNamespace(createConfig, runtime) if err != nil { return err } if became { os.Exit(ret) } ctr, err := runtime.NewContainer(ctx, runtimeSpec, options...) if err != nil { return err } createConfigJSON, err := json.Marshal(createConfig) if err != nil { return err } if err := ctr.AddArtifact("create-config", createConfigJSON); err != nil { return err } logrus.Debug("new container created ", ctr.ID()) if c.String("cidfile") != "" { err := libpod.WriteFile(ctr.ID(), c.String("cidfile")) if err != nil { logrus.Error(err) } } fmt.Printf("%s\n", ctr.ID()) return nil } // Checks if a user-specified AppArmor profile is loaded, or loads the default profile if // AppArmor is enabled. // Any interaction with AppArmor requires root permissions. func loadAppArmor(config *cc.CreateConfig) error { if rootless.IsRootless() { noAAMsg := "AppArmor security is not available in rootless mode" switch config.ApparmorProfile { case "": logrus.Warn(noAAMsg) case "unconfined": default: return fmt.Errorf(noAAMsg) } return nil } if config.ApparmorProfile == "" && apparmor.IsEnabled() { // Unless specified otherwise, make sure that the default AppArmor // profile is installed. To avoid redundantly loading the profile // on each invocation, check if it's loaded before installing it. // Suffix the profile with the current libpod version to allow // loading the new, potentially updated profile after an update. profile := fmt.Sprintf("%s-%s", apparmor.DefaultLibpodProfile, libpodVersion.Version) loadProfile := func() error { isLoaded, err := apparmor.IsLoaded(profile) if err != nil { return err } if !isLoaded { err = apparmor.InstallDefault(profile) if err != nil { return err } } return nil } if err := loadProfile(); err != nil { switch err { case apparmor.ErrApparmorUnsupported: // do not set the profile when AppArmor isn't supported logrus.Debugf("AppArmor is not supported: setting empty profile") default: return err } } else { logrus.Infof("Sucessfully loaded AppAmor profile '%s'", profile) config.ApparmorProfile = profile } } else if config.ApparmorProfile != "" && config.ApparmorProfile != "unconfined" { if !apparmor.IsEnabled() { return fmt.Errorf("Profile specified but AppArmor is disabled on the host") } isLoaded, err := apparmor.IsLoaded(config.ApparmorProfile) if err != nil { switch err { case apparmor.ErrApparmorUnsupported: return fmt.Errorf("Profile specified but AppArmor is not supported") default: return fmt.Errorf("Error checking if AppArmor profile is loaded: %v", err) } } if !isLoaded { return fmt.Errorf("The specified AppArmor profile '%s' is not loaded", config.ApparmorProfile) } } return nil } func parseSecurityOpt(config *cc.CreateConfig, securityOpts []string) error { var ( labelOpts []string err error ) if config.PidMode.IsHost() { labelOpts = append(labelOpts, label.DisableSecOpt()...) } else if config.PidMode.IsContainer() { ctr, err := config.Runtime.LookupContainer(config.PidMode.Container()) if err != nil { return errors.Wrapf(err, "container %q not found", config.PidMode.Container()) } labelOpts = append(labelOpts, label.DupSecOpt(ctr.ProcessLabel())...) } if config.IpcMode.IsHost() { labelOpts = append(labelOpts, label.DisableSecOpt()...) } else if config.IpcMode.IsContainer() { ctr, err := config.Runtime.LookupContainer(config.IpcMode.Container()) if err != nil { return errors.Wrapf(err, "container %q not found", config.IpcMode.Container()) } labelOpts = append(labelOpts, label.DupSecOpt(ctr.ProcessLabel())...) } for _, opt := range securityOpts { if opt == "no-new-privileges" { config.NoNewPrivs = true } else { con := strings.SplitN(opt, "=", 2) if len(con) != 2 { return fmt.Errorf("Invalid --security-opt 1: %q", opt) } switch con[0] { case "label": labelOpts = append(labelOpts, con[1]) case "apparmor": config.ApparmorProfile = con[1] case "seccomp": config.SeccompProfilePath = con[1] default: return fmt.Errorf("Invalid --security-opt 2: %q", opt) } } } if err := loadAppArmor(config); err != nil { return err } if config.SeccompProfilePath == "" { if _, err := os.Stat(libpod.SeccompOverridePath); err == nil { config.SeccompProfilePath = libpod.SeccompOverridePath } else { if !os.IsNotExist(err) { return errors.Wrapf(err, "can't check if %q exists", libpod.SeccompOverridePath) } if _, err := os.Stat(libpod.SeccompDefaultPath); err != nil { if !os.IsNotExist(err) { return errors.Wrapf(err, "can't check if %q exists", libpod.SeccompDefaultPath) } } else { config.SeccompProfilePath = libpod.SeccompDefaultPath } } } config.ProcessLabel, config.MountLabel, err = label.InitLabels(labelOpts) return err } // isPortInPortBindings determines if an exposed host port is in user // provided ports func isPortInPortBindings(pb map[nat.Port][]nat.PortBinding, port nat.Port) bool { var hostPorts []string for _, i := range pb { hostPorts = append(hostPorts, i[0].HostPort) } return util.StringInSlice(port.Port(), hostPorts) } // isPortInImagePorts determines if an exposed host port was given to us by metadata // in the image itself func isPortInImagePorts(exposedPorts map[string]struct{}, port string) bool { for i := range exposedPorts { fields := strings.Split(i, "/") if port == fields[0] { return true } } return false } func configureEntrypoint(c *cli.Context, data *inspect.ImageData) []string { entrypoint := []string{} if c.IsSet("entrypoint") { // Force entrypoint to "" if c.String("entrypoint") == "" { return entrypoint } // Check if entrypoint specified is json if err := json.Unmarshal([]byte(c.String("entrypoint")), &entrypoint); err == nil { return entrypoint } // Return entrypoint as a single command return []string{c.String("entrypoint")} } if data != nil { return data.ContainerConfig.Entrypoint } return entrypoint } func configurePod(c *cli.Context, runtime *libpod.Runtime, namespaces map[string]string) (map[string]string, error) { pod, err := runtime.LookupPod(c.String("pod")) if err != nil { return namespaces, err } podInfraID, err := pod.InfraContainerID() if err != nil { return namespaces, err } if (namespaces["pid"] == cc.Pod) || (!c.IsSet("pid") && pod.SharesPID()) { namespaces["pid"] = fmt.Sprintf("container:%s", podInfraID) } if (namespaces["net"] == cc.Pod) || (!c.IsSet("net") && pod.SharesNet()) { namespaces["net"] = fmt.Sprintf("container:%s", podInfraID) } if (namespaces["user"] == cc.Pod) || (!c.IsSet("user") && pod.SharesUser()) { namespaces["user"] = fmt.Sprintf("container:%s", podInfraID) } if (namespaces["ipc"] == cc.Pod) || (!c.IsSet("ipc") && pod.SharesIPC()) { namespaces["ipc"] = fmt.Sprintf("container:%s", podInfraID) } if (namespaces["uts"] == cc.Pod) || (!c.IsSet("uts") && pod.SharesUTS()) { namespaces["uts"] = fmt.Sprintf("container:%s", podInfraID) } return namespaces, nil } // Parses CLI options related to container creation into a config which can be // parsed into an OCI runtime spec func parseCreateOpts(ctx context.Context, c *cli.Context, runtime *libpod.Runtime, imageName string, data *inspect.ImageData) (*cc.CreateConfig, error) { var ( inputCommand, command []string memoryLimit, memoryReservation, memorySwap, memoryKernel int64 blkioWeight uint16 ) idmappings, err := util.ParseIDMapping(c.StringSlice("uidmap"), c.StringSlice("gidmap"), c.String("subuidname"), c.String("subgidname")) if err != nil { return nil, err } if c.String("mac-address") != "" { return nil, errors.Errorf("--mac-address option not currently supported") } imageID := "" inputCommand = c.Args()[1:] if data != nil { imageID = data.ID } rootfs := "" if c.Bool("rootfs") { rootfs = c.Args()[0] } sysctl, err := validateSysctl(c.StringSlice("sysctl")) if err != nil { return nil, errors.Wrapf(err, "invalid value for sysctl") } if c.String("memory") != "" { memoryLimit, err = units.RAMInBytes(c.String("memory")) if err != nil { return nil, errors.Wrapf(err, "invalid value for memory") } } if c.String("memory-reservation") != "" { memoryReservation, err = units.RAMInBytes(c.String("memory-reservation")) if err != nil { return nil, errors.Wrapf(err, "invalid value for memory-reservation") } } if c.String("memory-swap") != "" { memorySwap, err = units.RAMInBytes(c.String("memory-swap")) if err != nil { return nil, errors.Wrapf(err, "invalid value for memory-swap") } } if c.String("kernel-memory") != "" { memoryKernel, err = units.RAMInBytes(c.String("kernel-memory")) if err != nil { return nil, errors.Wrapf(err, "invalid value for kernel-memory") } } if c.String("blkio-weight") != "" { u, err := strconv.ParseUint(c.String("blkio-weight"), 10, 16) if err != nil { return nil, errors.Wrapf(err, "invalid value for blkio-weight") } blkioWeight = uint16(u) } if err = parseVolumes(c.StringSlice("volume")); err != nil { return nil, err } if err = parseVolumesFrom(c.StringSlice("volumes-from")); err != nil { return nil, err } tty := c.Bool("tty") if c.Bool("detach") && c.Bool("rm") { return nil, errors.Errorf("--rm and --detach can not be specified together") } if c.Int64("cpu-period") != 0 && c.Float64("cpus") > 0 { return nil, errors.Errorf("--cpu-period and --cpus cannot be set together") } if c.Int64("cpu-quota") != 0 && c.Float64("cpus") > 0 { return nil, errors.Errorf("--cpu-quota and --cpus cannot be set together") } // Kernel Namespaces // TODO Fix handling of namespace from pod // Instead of integrating here, should be done in libpod // However, that also involves setting up security opts // when the pod's namespace is integrated namespaces := map[string]string{ "pid": c.String("pid"), "net": c.String("net"), "ipc": c.String("ipc"), "user": c.String("userns"), "uts": c.String("uts"), } if c.IsSet("pod") { namespaces, err = configurePod(c, runtime, namespaces) if err != nil { return nil, err } } pidMode := ns.PidMode(namespaces["pid"]) if !cc.Valid(string(pidMode), pidMode) { return nil, errors.Errorf("--pid %q is not valid", c.String("pid")) } usernsMode := ns.UsernsMode(namespaces["user"]) if !cc.Valid(string(usernsMode), usernsMode) { return nil, errors.Errorf("--userns %q is not valid", namespaces["user"]) } utsMode := ns.UTSMode(namespaces["uts"]) if !cc.Valid(string(utsMode), utsMode) { return nil, errors.Errorf("--uts %q is not valid", namespaces["uts"]) } ipcMode := ns.IpcMode(namespaces["ipc"]) if !cc.Valid(string(ipcMode), ipcMode) { return nil, errors.Errorf("--ipc %q is not valid", ipcMode) } // Make sure if network is set to container namespace, port binding is not also being asked for netMode := ns.NetworkMode(namespaces["net"]) if netMode.IsContainer() { if len(c.StringSlice("publish")) > 0 || c.Bool("publish-all") { return nil, errors.Errorf("cannot set port bindings on an existing container network namespace") } } shmDir := "" if ipcMode.IsHost() { shmDir = "/dev/shm" } else if ipcMode.IsContainer() { ctr, err := runtime.LookupContainer(ipcMode.Container()) if err != nil { return nil, errors.Wrapf(err, "container %q not found", ipcMode.Container()) } shmDir = ctr.ShmDir() } // USER user := c.String("user") if user == "" { if data == nil { user = "0" } else { user = data.ContainerConfig.User } } // STOP SIGNAL stopSignal := syscall.SIGTERM signalString := "" if data != nil { signalString = data.ContainerConfig.StopSignal } if c.IsSet("stop-signal") { signalString = c.String("stop-signal") } if signalString != "" { stopSignal, err = signal.ParseSignal(signalString) if err != nil { return nil, err } } // ENVIRONMENT VARIABLES env := defaultEnvVariables if data != nil { for _, e := range data.ContainerConfig.Env { split := strings.SplitN(e, "=", 2) if len(split) > 1 { env[split[0]] = split[1] } else { env[split[0]] = "" } } } if err := readKVStrings(env, c.StringSlice("env-file"), c.StringSlice("env")); err != nil { return nil, errors.Wrapf(err, "unable to process environment variables") } // LABEL VARIABLES labels, err := getAllLabels(c.StringSlice("label-file"), c.StringSlice("label")) if err != nil { return nil, errors.Wrapf(err, "unable to process labels") } if data != nil { for key, val := range data.ContainerConfig.Labels { if _, ok := labels[key]; !ok { labels[key] = val } } } // ANNOTATIONS annotations := make(map[string]string) // First, add our default annotations annotations[ann.ContainerType] = "sandbox" annotations[ann.TTY] = "false" if tty { annotations[ann.TTY] = "true" } if data != nil { // Next, add annotations from the image for key, value := range data.Annotations { annotations[key] = value } } // Last, add user annotations for _, annotation := range c.StringSlice("annotation") { splitAnnotation := strings.SplitN(annotation, "=", 2) if len(splitAnnotation) < 2 { return nil, errors.Errorf("Annotations must be formatted KEY=VALUE") } annotations[splitAnnotation[0]] = splitAnnotation[1] } // WORKING DIRECTORY workDir := "/" if c.IsSet("workdir") || c.IsSet("w") { workDir = c.String("workdir") } else if data != nil && data.ContainerConfig.WorkingDir != "" { workDir = data.ContainerConfig.WorkingDir } entrypoint := configureEntrypoint(c, data) // Build the command // If we have an entry point, it goes first if len(entrypoint) > 0 { command = entrypoint } if len(inputCommand) > 0 { // User command overrides data CMD command = append(command, inputCommand...) } else if data != nil && len(data.ContainerConfig.Cmd) > 0 && !c.IsSet("entrypoint") { // If not user command, add CMD command = append(command, data.ContainerConfig.Cmd...) } if len(command) == 0 { return nil, errors.Errorf("No command specified on command line or as CMD or ENTRYPOINT in this image") } // EXPOSED PORTS var portBindings map[nat.Port][]nat.PortBinding if data != nil { portBindings, err = cc.ExposedPorts(c.StringSlice("expose"), c.StringSlice("publish"), c.Bool("publish-all"), data.ContainerConfig.ExposedPorts) if err != nil { return nil, err } } // SHM Size shmSize, err := units.FromHumanSize(c.String("shm-size")) if err != nil { return nil, errors.Wrapf(err, "unable to translate --shm-size") } // Verify the additional hosts are in correct format for _, host := range c.StringSlice("add-host") { if _, err := validateExtraHost(host); err != nil { return nil, err } } // Check for . and dns-search domains if util.StringInSlice(".", c.StringSlice("dns-search")) && len(c.StringSlice("dns-search")) > 1 { return nil, errors.Errorf("cannot pass additional search domains when also specifying '.'") } // Validate domains are good for _, dom := range c.StringSlice("dns-search") { if _, err := validateDomain(dom); err != nil { return nil, err } } var ImageVolumes map[string]struct{} if data != nil { ImageVolumes = data.ContainerConfig.Volumes } var imageVolType = map[string]string{ "bind": "", "tmpfs": "", "ignore": "", } if _, ok := imageVolType[c.String("image-volume")]; !ok { return nil, errors.Errorf("invalid image-volume type %q. Pick one of bind, tmpfs, or ignore", c.String("image-volume")) } var systemd bool if c.BoolT("systemd") && ((filepath.Base(command[0]) == "init") || (filepath.Base(command[0]) == "systemd")) { systemd = true if signalString == "" { stopSignal, err = signal.ParseSignal("RTMIN+3") if err != nil { return nil, errors.Wrapf(err, "error parsing systemd signal") } } } config := &cc.CreateConfig{ Runtime: runtime, Annotations: annotations, BuiltinImgVolumes: ImageVolumes, ConmonPidFile: c.String("conmon-pidfile"), ImageVolumeType: c.String("image-volume"), CapAdd: c.StringSlice("cap-add"), CapDrop: c.StringSlice("cap-drop"), CgroupParent: c.String("cgroup-parent"), Command: command, Detach: c.Bool("detach"), Devices: c.StringSlice("device"), DNSOpt: c.StringSlice("dns-opt"), DNSSearch: c.StringSlice("dns-search"), DNSServers: c.StringSlice("dns"), Entrypoint: entrypoint, Env: env, //ExposedPorts: ports, GroupAdd: c.StringSlice("group-add"), Hostname: c.String("hostname"), HostAdd: c.StringSlice("add-host"), IDMappings: idmappings, Image: imageName, ImageID: imageID, Interactive: c.Bool("interactive"), IP6Address: c.String("ipv6"), IPAddress: c.String("ip"), Labels: labels, LinkLocalIP: c.StringSlice("link-local-ip"), LogDriver: c.String("log-driver"), LogDriverOpt: c.StringSlice("log-opt"), MacAddress: c.String("mac-address"), Name: c.String("name"), Network: c.String("network"), NetworkAlias: c.StringSlice("network-alias"), IpcMode: ipcMode, NetMode: netMode, UtsMode: utsMode, PidMode: pidMode, Pod: c.String("pod"), Privileged: c.Bool("privileged"), Publish: c.StringSlice("publish"), PublishAll: c.Bool("publish-all"), PortBindings: portBindings, Quiet: c.Bool("quiet"), ReadOnlyRootfs: c.Bool("read-only"), Resources: cc.CreateResourceConfig{ BlkioWeight: blkioWeight, BlkioWeightDevice: c.StringSlice("blkio-weight-device"), CPUShares: c.Uint64("cpu-shares"), CPUPeriod: c.Uint64("cpu-period"), CPUsetCPUs: c.String("cpuset-cpus"), CPUsetMems: c.String("cpuset-mems"), CPUQuota: c.Int64("cpu-quota"), CPURtPeriod: c.Uint64("cpu-rt-period"), CPURtRuntime: c.Int64("cpu-rt-runtime"), CPUs: c.Float64("cpus"), DeviceReadBps: c.StringSlice("device-read-bps"), DeviceReadIOps: c.StringSlice("device-read-iops"), DeviceWriteBps: c.StringSlice("device-write-bps"), DeviceWriteIOps: c.StringSlice("device-write-iops"), DisableOomKiller: c.Bool("oom-kill-disable"), ShmSize: shmSize, Memory: memoryLimit, MemoryReservation: memoryReservation, MemorySwap: memorySwap, MemorySwappiness: c.Int("memory-swappiness"), KernelMemory: memoryKernel, OomScoreAdj: c.Int("oom-score-adj"), PidsLimit: c.Int64("pids-limit"), Ulimit: c.StringSlice("ulimit"), }, Rm: c.Bool("rm"), ShmDir: shmDir, StopSignal: stopSignal, StopTimeout: c.Uint("stop-timeout"), Sysctl: sysctl, Systemd: systemd, Tmpfs: c.StringSlice("tmpfs"), Tty: tty, User: user, UsernsMode: usernsMode, Volumes: c.StringSlice("volume"), WorkDir: workDir, Rootfs: rootfs, VolumesFrom: c.StringSlice("volumes-from"), } if !config.Privileged { if err := parseSecurityOpt(config, c.StringSlice("security-opt")); err != nil { return nil, err } } config.SecurityOpts = c.StringSlice("security-opt") warnings, err := verifyContainerResources(config, false) if err != nil { return nil, err } for _, warning := range warnings { fmt.Fprintln(os.Stderr, warning) } return config, nil } func joinOrCreateRootlessUserNamespace(createConfig *cc.CreateConfig, runtime *libpod.Runtime) (bool, int, error) { if os.Geteuid() == 0 { return false, 0, nil } if createConfig.Pod != "" { pod, err := runtime.LookupPod(createConfig.Pod) if err != nil { return false, -1, err } inspect, err := pod.Inspect() for _, ctr := range inspect.Containers { prevCtr, err := runtime.LookupContainer(ctr.ID) if err != nil { return false, -1, err } s, err := prevCtr.State() if err != nil { return false, -1, err } if s != libpod.ContainerStateRunning && s != libpod.ContainerStatePaused { continue } pid, err := prevCtr.PID() if err != nil { return false, -1, err } return rootless.JoinNS(uint(pid)) } } return rootless.BecomeRootInUserNS() }