package kube import ( "context" "encoding/json" "fmt" "net" "strings" "github.com/containers/common/libimage" "github.com/containers/common/pkg/parse" "github.com/containers/common/pkg/secrets" ann "github.com/containers/podman/v3/pkg/annotations" "github.com/containers/podman/v3/pkg/specgen" "github.com/containers/podman/v3/pkg/util" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/pkg/errors" v1 "k8s.io/api/core/v1" "k8s.io/apimachinery/pkg/api/resource" ) func ToPodGen(ctx context.Context, podName string, podYAML *v1.PodTemplateSpec) (*specgen.PodSpecGenerator, error) { p := specgen.NewPodSpecGenerator() p.Name = podName p.Labels = podYAML.ObjectMeta.Labels // TODO we only configure Process namespace. We also need to account for Host{IPC,Network,PID} // which is not currently possible with pod create if podYAML.Spec.ShareProcessNamespace != nil && *podYAML.Spec.ShareProcessNamespace { p.SharedNamespaces = append(p.SharedNamespaces, "pid") } p.Hostname = podYAML.Spec.Hostname if p.Hostname == "" { p.Hostname = podName } if podYAML.Spec.HostNetwork { p.NetNS.NSMode = specgen.Host } if podYAML.Spec.HostAliases != nil { hosts := make([]string, 0, len(podYAML.Spec.HostAliases)) for _, hostAlias := range podYAML.Spec.HostAliases { for _, host := range hostAlias.Hostnames { hosts = append(hosts, host+":"+hostAlias.IP) } } p.HostAdd = hosts } podPorts := getPodPorts(podYAML.Spec.Containers) p.PortMappings = podPorts if dnsConfig := podYAML.Spec.DNSConfig; dnsConfig != nil { // name servers if dnsServers := dnsConfig.Nameservers; len(dnsServers) > 0 { servers := make([]net.IP, 0) for _, server := range dnsServers { servers = append(servers, net.ParseIP(server)) } p.DNSServer = servers } // search domains if domains := dnsConfig.Searches; len(domains) > 0 { p.DNSSearch = domains } // dns options if options := dnsConfig.Options; len(options) > 0 { dnsOptions := make([]string, 0) for _, opts := range options { d := opts.Name if opts.Value != nil { d += ":" + *opts.Value } dnsOptions = append(dnsOptions, d) } } } return p, nil } type CtrSpecGenOptions struct { // Container as read from the pod yaml Container v1.Container // Image available to use (pulled or found local) Image *libimage.Image // Volumes for all containers Volumes map[string]*KubeVolume // PodID of the parent pod PodID string // PodName of the parent pod PodName string // PodInfraID as the infrastructure container id PodInfraID string // ConfigMaps the configuration maps for environment variables ConfigMaps []v1.ConfigMap // SeccompPaths for finding the seccomp profile path SeccompPaths *KubeSeccompPaths // RestartPolicy defines the restart policy of the container RestartPolicy string // NetNSIsHost tells the container to use the host netns NetNSIsHost bool // SecretManager to access the secrets SecretsManager *secrets.SecretsManager // LogDriver which should be used for the container LogDriver string // Labels define key-value pairs of metadata Labels map[string]string } func ToSpecGen(ctx context.Context, opts *CtrSpecGenOptions) (*specgen.SpecGenerator, error) { s := specgen.NewSpecGenerator(opts.Container.Image, false) // pod name should be non-empty for Deployment objects to be able to create // multiple pods having containers with unique names if len(opts.PodName) < 1 { return nil, errors.Errorf("got empty pod name on container creation when playing kube") } s.Name = fmt.Sprintf("%s-%s", opts.PodName, opts.Container.Name) s.Terminal = opts.Container.TTY s.Pod = opts.PodID s.LogConfiguration = &specgen.LogConfig{ Driver: opts.LogDriver, } setupSecurityContext(s, opts.Container) // Since we prefix the container name with pod name to work-around the uniqueness requirement, // the seccomp profile should reference the actual container name from the YAML // but apply to the containers with the prefixed name s.SeccompProfilePath = opts.SeccompPaths.FindForContainer(opts.Container.Name) s.ResourceLimits = &spec.LinuxResources{} milliCPU, err := quantityToInt64(opts.Container.Resources.Limits.Cpu()) if err != nil { return nil, errors.Wrap(err, "Failed to set CPU quota") } if milliCPU > 0 { period, quota := util.CoresToPeriodAndQuota(float64(milliCPU) / 1000) s.ResourceLimits.CPU = &spec.LinuxCPU{ Quota: "a, Period: &period, } } limit, err := quantityToInt64(opts.Container.Resources.Limits.Memory()) if err != nil { return nil, errors.Wrap(err, "Failed to set memory limit") } memoryRes, err := quantityToInt64(opts.Container.Resources.Requests.Memory()) if err != nil { return nil, errors.Wrap(err, "Failed to set memory reservation") } if limit > 0 || memoryRes > 0 { s.ResourceLimits.Memory = &spec.LinuxMemory{} } if limit > 0 { s.ResourceLimits.Memory.Limit = &limit } if memoryRes > 0 { s.ResourceLimits.Memory.Reservation = &memoryRes } // TODO: We don't understand why specgen does not take of this, but // integration tests clearly pointed out that it was required. imageData, err := opts.Image.Inspect(ctx, false) if err != nil { return nil, err } s.WorkDir = "/" // Entrypoint/Command handling is based off of // https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#notes if imageData != nil && imageData.Config != nil { if imageData.Config.WorkingDir != "" { s.WorkDir = imageData.Config.WorkingDir } // Pull entrypoint and cmd from image s.Entrypoint = imageData.Config.Entrypoint s.Command = imageData.Config.Cmd s.Labels = imageData.Config.Labels if len(imageData.Config.StopSignal) > 0 { stopSignal, err := util.ParseSignal(imageData.Config.StopSignal) if err != nil { return nil, err } s.StopSignal = &stopSignal } } // If only the yaml.Command is specified, set it as the entrypoint and drop the image Cmd if len(opts.Container.Command) != 0 { s.Entrypoint = opts.Container.Command s.Command = []string{} } // Only override the cmd field if yaml.Args is specified // Keep the image entrypoint, or the yaml.command if specified if len(opts.Container.Args) != 0 { s.Command = opts.Container.Args } // FIXME, // we are currently ignoring imageData.Config.ExposedPorts if opts.Container.WorkingDir != "" { s.WorkDir = opts.Container.WorkingDir } annotations := make(map[string]string) if opts.PodInfraID != "" { annotations[ann.SandboxID] = opts.PodInfraID annotations[ann.ContainerType] = ann.ContainerTypeContainer } s.Annotations = annotations // Environment Variables envs := map[string]string{} for _, env := range imageData.Config.Env { keyval := strings.Split(env, "=") envs[keyval[0]] = keyval[1] } for _, env := range opts.Container.Env { value, err := envVarValue(env, opts) if err != nil { return nil, err } envs[env.Name] = value } for _, envFrom := range opts.Container.EnvFrom { cmEnvs, err := envVarsFrom(envFrom, opts) if err != nil { return nil, err } for k, v := range cmEnvs { envs[k] = v } } s.Env = envs for _, volume := range opts.Container.VolumeMounts { volumeSource, exists := opts.Volumes[volume.Name] if !exists { return nil, errors.Errorf("Volume mount %s specified for container but not configured in volumes", volume.Name) } switch volumeSource.Type { case KubeVolumeTypeBindMount: if err := parse.ValidateVolumeCtrDir(volume.MountPath); err != nil { return nil, errors.Wrapf(err, "error in parsing MountPath") } mount := spec.Mount{ Destination: volume.MountPath, Source: volumeSource.Source, Type: "bind", } if volume.ReadOnly { mount.Options = []string{"ro"} } s.Mounts = append(s.Mounts, mount) case KubeVolumeTypeNamed: namedVolume := specgen.NamedVolume{ Dest: volume.MountPath, Name: volumeSource.Source, } if volume.ReadOnly { namedVolume.Options = []string{"ro"} } s.Volumes = append(s.Volumes, &namedVolume) default: return nil, errors.Errorf("Unsupported volume source type") } } s.RestartPolicy = opts.RestartPolicy if opts.NetNSIsHost { s.NetNS.NSMode = specgen.Host } // Add labels that come from kube if len(s.Labels) == 0 { // If there are no labels, let's use the map that comes // from kube s.Labels = opts.Labels } else { // If there are already labels in the map, append the ones // obtained from kube for k, v := range opts.Labels { s.Labels[k] = v } } return s, nil } func setupSecurityContext(s *specgen.SpecGenerator, containerYAML v1.Container) { if containerYAML.SecurityContext == nil { return } if containerYAML.SecurityContext.ReadOnlyRootFilesystem != nil { s.ReadOnlyFilesystem = *containerYAML.SecurityContext.ReadOnlyRootFilesystem } if containerYAML.SecurityContext.Privileged != nil { s.Privileged = *containerYAML.SecurityContext.Privileged } if containerYAML.SecurityContext.AllowPrivilegeEscalation != nil { s.NoNewPrivileges = !*containerYAML.SecurityContext.AllowPrivilegeEscalation } if seopt := containerYAML.SecurityContext.SELinuxOptions; seopt != nil { if seopt.User != "" { s.SelinuxOpts = append(s.SelinuxOpts, fmt.Sprintf("user:%s", seopt.User)) } if seopt.Role != "" { s.SelinuxOpts = append(s.SelinuxOpts, fmt.Sprintf("role:%s", seopt.Role)) } if seopt.Type != "" { s.SelinuxOpts = append(s.SelinuxOpts, fmt.Sprintf("type:%s", seopt.Type)) } if seopt.Level != "" { s.SelinuxOpts = append(s.SelinuxOpts, fmt.Sprintf("level:%s", seopt.Level)) } } if caps := containerYAML.SecurityContext.Capabilities; caps != nil { for _, capability := range caps.Add { s.CapAdd = append(s.CapAdd, string(capability)) } for _, capability := range caps.Drop { s.CapDrop = append(s.CapDrop, string(capability)) } } if containerYAML.SecurityContext.RunAsUser != nil { s.User = fmt.Sprintf("%d", *containerYAML.SecurityContext.RunAsUser) } if containerYAML.SecurityContext.RunAsGroup != nil { if s.User == "" { s.User = "0" } s.User = fmt.Sprintf("%s:%d", s.User, *containerYAML.SecurityContext.RunAsGroup) } } func quantityToInt64(quantity *resource.Quantity) (int64, error) { if i, ok := quantity.AsInt64(); ok { return i, nil } if i, ok := quantity.AsDec().Unscaled(); ok { return i, nil } return 0, errors.Errorf("Quantity cannot be represented as int64: %v", quantity) } // read a k8s secret in JSON format from the secret manager func k8sSecretFromSecretManager(name string, secretsManager *secrets.SecretsManager) (map[string][]byte, error) { _, jsonSecret, err := secretsManager.LookupSecretData(name) if err != nil { return nil, err } var secrets map[string][]byte if err := json.Unmarshal(jsonSecret, &secrets); err != nil { return nil, errors.Errorf("Secret %v is not valid JSON: %v", name, err) } return secrets, nil } // envVarsFrom returns all key-value pairs as env vars from a configMap or secret that matches the envFrom setting of a container func envVarsFrom(envFrom v1.EnvFromSource, opts *CtrSpecGenOptions) (map[string]string, error) { envs := map[string]string{} if envFrom.ConfigMapRef != nil { cmRef := envFrom.ConfigMapRef err := errors.Errorf("Configmap %v not found", cmRef.Name) for _, c := range opts.ConfigMaps { if cmRef.Name == c.Name { envs = c.Data err = nil break } } if err != nil && (cmRef.Optional == nil || !*cmRef.Optional) { return nil, err } } if envFrom.SecretRef != nil { secRef := envFrom.SecretRef secret, err := k8sSecretFromSecretManager(secRef.Name, opts.SecretsManager) if err == nil { for k, v := range secret { envs[k] = string(v) } } else if secRef.Optional == nil || !*secRef.Optional { return nil, err } } return envs, nil } // envVarValue returns the environment variable value configured within the container's env setting. // It gets the value from a configMap or secret if specified, otherwise returns env.Value func envVarValue(env v1.EnvVar, opts *CtrSpecGenOptions) (string, error) { if env.ValueFrom != nil { if env.ValueFrom.ConfigMapKeyRef != nil { cmKeyRef := env.ValueFrom.ConfigMapKeyRef err := errors.Errorf("Cannot set env %v: configmap %v not found", env.Name, cmKeyRef.Name) for _, c := range opts.ConfigMaps { if cmKeyRef.Name == c.Name { if value, ok := c.Data[cmKeyRef.Key]; ok { return value, nil } err = errors.Errorf("Cannot set env %v: key %s not found in configmap %v", env.Name, cmKeyRef.Key, cmKeyRef.Name) break } } if cmKeyRef.Optional == nil || !*cmKeyRef.Optional { return "", err } return "", nil } if env.ValueFrom.SecretKeyRef != nil { secKeyRef := env.ValueFrom.SecretKeyRef secret, err := k8sSecretFromSecretManager(secKeyRef.Name, opts.SecretsManager) if err == nil { if val, ok := secret[secKeyRef.Key]; ok { return string(val), nil } err = errors.Errorf("Secret %v has not %v key", secKeyRef.Name, secKeyRef.Key) } if secKeyRef.Optional == nil || !*secKeyRef.Optional { return "", errors.Errorf("Cannot set env %v: %v", env.Name, err) } return "", nil } } return env.Value, nil } // getPodPorts converts a slice of kube container descriptions to an // array of portmapping func getPodPorts(containers []v1.Container) []specgen.PortMapping { var infraPorts []specgen.PortMapping for _, container := range containers { for _, p := range container.Ports { if p.HostPort != 0 && p.ContainerPort == 0 { p.ContainerPort = p.HostPort } if p.Protocol == "" { p.Protocol = "tcp" } portBinding := specgen.PortMapping{ HostPort: uint16(p.HostPort), ContainerPort: uint16(p.ContainerPort), Protocol: strings.ToLower(string(p.Protocol)), HostIP: p.HostIP, } // only hostPort is utilized in podman context, all container ports // are accessible inside the shared network namespace if p.HostPort != 0 { infraPorts = append(infraPorts, portBinding) } } } return infraPorts }