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-rw-r--r--pkg/specgen/generate/kube/kube.go312
-rw-r--r--pkg/specgen/generate/kube/play_test.go172
-rw-r--r--pkg/specgen/generate/kube/seccomp.go84
3 files changed, 568 insertions, 0 deletions
diff --git a/pkg/specgen/generate/kube/kube.go b/pkg/specgen/generate/kube/kube.go
new file mode 100644
index 000000000..e1202956c
--- /dev/null
+++ b/pkg/specgen/generate/kube/kube.go
@@ -0,0 +1,312 @@
+package kube
+
+import (
+ "context"
+ "fmt"
+ "strings"
+
+ "github.com/containers/buildah/pkg/parse"
+ "github.com/containers/podman/v2/libpod/image"
+ ann "github.com/containers/podman/v2/pkg/annotations"
+ "github.com/containers/podman/v2/pkg/specgen"
+ "github.com/containers/podman/v2/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.Value = "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
+
+ return p, nil
+}
+
+func ToSpecGen(ctx context.Context, containerYAML v1.Container, iid string, newImage *image.Image, volumes map[string]string, podID, podName, infraID string, configMaps []v1.ConfigMap, seccompPaths *KubeSeccompPaths, restartPolicy string) (*specgen.SpecGenerator, error) {
+ s := specgen.NewSpecGenerator(iid, false)
+
+ // podName should be non-empty for Deployment objects to be able to create
+ // multiple pods having containers with unique names
+ if len(podName) < 1 {
+ return nil, errors.Errorf("kubeContainerToCreateConfig got empty podName")
+ }
+
+ s.Name = fmt.Sprintf("%s-%s", podName, containerYAML.Name)
+
+ s.Terminal = containerYAML.TTY
+
+ s.Pod = podID
+
+ setupSecurityContext(s, containerYAML)
+
+ // 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 = seccompPaths.FindForContainer(containerYAML.Name)
+
+ s.ResourceLimits = &spec.LinuxResources{}
+ milliCPU, err := quantityToInt64(containerYAML.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: &quota,
+ Period: &period,
+ }
+ }
+
+ limit, err := quantityToInt64(containerYAML.Resources.Limits.Memory())
+ if err != nil {
+ return nil, errors.Wrap(err, "Failed to set memory limit")
+ }
+
+ memoryRes, err := quantityToInt64(containerYAML.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 dont understand why specgen does not take of this, but
+ // integration tests clearly pointed out that it was required.
+ s.Command = []string{}
+ imageData, err := newImage.Inspect(ctx)
+ if err != nil {
+ return nil, err
+ }
+ s.WorkDir = "/"
+ if imageData != nil && imageData.Config != nil {
+ if imageData.Config.WorkingDir != "" {
+ s.WorkDir = imageData.Config.WorkingDir
+ }
+ s.Command = imageData.Config.Entrypoint
+ 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 len(containerYAML.Command) != 0 {
+ s.Command = containerYAML.Command
+ }
+ // doc https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#notes
+ if len(containerYAML.Args) != 0 {
+ s.Command = append(s.Command, containerYAML.Args...)
+ }
+ // FIXME,
+ // we are currently ignoring imageData.Config.ExposedPorts
+ if containerYAML.WorkingDir != "" {
+ s.WorkDir = containerYAML.WorkingDir
+ }
+
+ annotations := make(map[string]string)
+ if infraID != "" {
+ annotations[ann.SandboxID] = infraID
+ annotations[ann.ContainerType] = ann.ContainerTypeContainer
+ }
+ s.Annotations = annotations
+
+ // Environment Variables
+ envs := map[string]string{}
+ for _, env := range containerYAML.Env {
+ value := envVarValue(env, configMaps)
+
+ envs[env.Name] = value
+ }
+ for _, envFrom := range containerYAML.EnvFrom {
+ cmEnvs := envVarsFromConfigMap(envFrom, configMaps)
+
+ for k, v := range cmEnvs {
+ envs[k] = v
+ }
+ }
+ s.Env = envs
+
+ for _, volume := range containerYAML.VolumeMounts {
+ hostPath, exists := volumes[volume.Name]
+ if !exists {
+ return nil, errors.Errorf("Volume mount %s specified for container but not configured in volumes", volume.Name)
+ }
+ if err := parse.ValidateVolumeCtrDir(volume.MountPath); err != nil {
+ return nil, errors.Wrapf(err, "error in parsing MountPath")
+ }
+ mount := spec.Mount{
+ Destination: volume.MountPath,
+ Source: hostPath,
+ Type: "bind",
+ }
+ if volume.ReadOnly {
+ mount.Options = []string{"ro"}
+ }
+ s.Mounts = append(s.Mounts, mount)
+ }
+
+ s.RestartPolicy = restartPolicy
+
+ 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("role:%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("role:%s", seopt.Type))
+ }
+ if seopt.Level != "" {
+ s.SelinuxOpts = append(s.SelinuxOpts, fmt.Sprintf("role:%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)
+}
+
+// envVarsFromConfigMap returns all key-value pairs as env vars from a configMap that matches the envFrom setting of a container
+func envVarsFromConfigMap(envFrom v1.EnvFromSource, configMaps []v1.ConfigMap) map[string]string {
+ envs := map[string]string{}
+
+ if envFrom.ConfigMapRef != nil {
+ cmName := envFrom.ConfigMapRef.Name
+
+ for _, c := range configMaps {
+ if cmName == c.Name {
+ envs = c.Data
+ break
+ }
+ }
+ }
+
+ return envs
+}
+
+// envVarValue returns the environment variable value configured within the container's env setting.
+// It gets the value from a configMap if specified, otherwise returns env.Value
+func envVarValue(env v1.EnvVar, configMaps []v1.ConfigMap) string {
+ for _, c := range configMaps {
+ if env.ValueFrom != nil {
+ if env.ValueFrom.ConfigMapKeyRef != nil {
+ if env.ValueFrom.ConfigMapKeyRef.Name == c.Name {
+ if value, ok := c.Data[env.ValueFrom.ConfigMapKeyRef.Key]; ok {
+ return value
+ }
+ }
+ }
+ }
+ }
+
+ return env.Value
+}
+
+// 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
+}
diff --git a/pkg/specgen/generate/kube/play_test.go b/pkg/specgen/generate/kube/play_test.go
new file mode 100644
index 000000000..148540e9f
--- /dev/null
+++ b/pkg/specgen/generate/kube/play_test.go
@@ -0,0 +1,172 @@
+package kube
+
+import (
+ "testing"
+
+ "github.com/stretchr/testify/assert"
+ v1 "k8s.io/api/core/v1"
+ v12 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func TestEnvVarsFromConfigMap(t *testing.T) {
+ tests := []struct {
+ name string
+ envFrom v1.EnvFromSource
+ configMapList []v1.ConfigMap
+ expected map[string]string
+ }{
+ {
+ "ConfigMapExists",
+ v1.EnvFromSource{
+ ConfigMapRef: &v1.ConfigMapEnvSource{
+ LocalObjectReference: v1.LocalObjectReference{
+ Name: "foo",
+ },
+ },
+ },
+ configMapList,
+ map[string]string{
+ "myvar": "foo",
+ },
+ },
+ {
+ "ConfigMapDoesNotExist",
+ v1.EnvFromSource{
+ ConfigMapRef: &v1.ConfigMapEnvSource{
+ LocalObjectReference: v1.LocalObjectReference{
+ Name: "doesnotexist",
+ },
+ },
+ },
+ configMapList,
+ map[string]string{},
+ },
+ {
+ "EmptyConfigMapList",
+ v1.EnvFromSource{
+ ConfigMapRef: &v1.ConfigMapEnvSource{
+ LocalObjectReference: v1.LocalObjectReference{
+ Name: "foo",
+ },
+ },
+ },
+ []v1.ConfigMap{},
+ map[string]string{},
+ },
+ }
+
+ for _, test := range tests {
+ test := test
+ t.Run(test.name, func(t *testing.T) {
+ result := envVarsFromConfigMap(test.envFrom, test.configMapList)
+ assert.Equal(t, test.expected, result)
+ })
+ }
+}
+
+func TestEnvVarValue(t *testing.T) {
+ tests := []struct {
+ name string
+ envVar v1.EnvVar
+ configMapList []v1.ConfigMap
+ expected string
+ }{
+ {
+ "ConfigMapExists",
+ v1.EnvVar{
+ Name: "FOO",
+ ValueFrom: &v1.EnvVarSource{
+ ConfigMapKeyRef: &v1.ConfigMapKeySelector{
+ LocalObjectReference: v1.LocalObjectReference{
+ Name: "foo",
+ },
+ Key: "myvar",
+ },
+ },
+ },
+ configMapList,
+ "foo",
+ },
+ {
+ "ContainerKeyDoesNotExistInConfigMap",
+ v1.EnvVar{
+ Name: "FOO",
+ ValueFrom: &v1.EnvVarSource{
+ ConfigMapKeyRef: &v1.ConfigMapKeySelector{
+ LocalObjectReference: v1.LocalObjectReference{
+ Name: "foo",
+ },
+ Key: "doesnotexist",
+ },
+ },
+ },
+ configMapList,
+ "",
+ },
+ {
+ "ConfigMapDoesNotExist",
+ v1.EnvVar{
+ Name: "FOO",
+ ValueFrom: &v1.EnvVarSource{
+ ConfigMapKeyRef: &v1.ConfigMapKeySelector{
+ LocalObjectReference: v1.LocalObjectReference{
+ Name: "doesnotexist",
+ },
+ Key: "myvar",
+ },
+ },
+ },
+ configMapList,
+ "",
+ },
+ {
+ "EmptyConfigMapList",
+ v1.EnvVar{
+ Name: "FOO",
+ ValueFrom: &v1.EnvVarSource{
+ ConfigMapKeyRef: &v1.ConfigMapKeySelector{
+ LocalObjectReference: v1.LocalObjectReference{
+ Name: "foo",
+ },
+ Key: "myvar",
+ },
+ },
+ },
+ []v1.ConfigMap{},
+ "",
+ },
+ }
+
+ for _, test := range tests {
+ test := test
+ t.Run(test.name, func(t *testing.T) {
+ result := envVarValue(test.envVar, test.configMapList)
+ assert.Equal(t, test.expected, result)
+ })
+ }
+}
+
+var configMapList = []v1.ConfigMap{
+ {
+ TypeMeta: v12.TypeMeta{
+ Kind: "ConfigMap",
+ },
+ ObjectMeta: v12.ObjectMeta{
+ Name: "bar",
+ },
+ Data: map[string]string{
+ "myvar": "bar",
+ },
+ },
+ {
+ TypeMeta: v12.TypeMeta{
+ Kind: "ConfigMap",
+ },
+ ObjectMeta: v12.ObjectMeta{
+ Name: "foo",
+ },
+ Data: map[string]string{
+ "myvar": "foo",
+ },
+ },
+}
diff --git a/pkg/specgen/generate/kube/seccomp.go b/pkg/specgen/generate/kube/seccomp.go
new file mode 100644
index 000000000..4cbdf6e2e
--- /dev/null
+++ b/pkg/specgen/generate/kube/seccomp.go
@@ -0,0 +1,84 @@
+package kube
+
+import (
+ "path/filepath"
+ "strings"
+
+ "github.com/containers/podman/v2/libpod"
+ "github.com/pkg/errors"
+ v1 "k8s.io/api/core/v1"
+)
+
+// KubeSeccompPaths holds information about a pod YAML's seccomp configuration
+// it holds both container and pod seccomp paths
+type KubeSeccompPaths struct {
+ containerPaths map[string]string
+ podPath string
+}
+
+// FindForContainer checks whether a container has a seccomp path configured for it
+// if not, it returns the podPath, which should always have a value
+func (k *KubeSeccompPaths) FindForContainer(ctrName string) string {
+ if path, ok := k.containerPaths[ctrName]; ok {
+ return path
+ }
+ return k.podPath
+}
+
+// InitializeSeccompPaths takes annotations from the pod object metadata and finds annotations pertaining to seccomp
+// it parses both pod and container level
+// if the annotation is of the form "localhost/%s", the seccomp profile will be set to profileRoot/%s
+func InitializeSeccompPaths(annotations map[string]string, profileRoot string) (*KubeSeccompPaths, error) {
+ seccompPaths := &KubeSeccompPaths{containerPaths: make(map[string]string)}
+ var err error
+ if annotations != nil {
+ for annKeyValue, seccomp := range annotations {
+ // check if it is prefaced with container.seccomp.security.alpha.kubernetes.io/
+ prefixAndCtr := strings.Split(annKeyValue, "/")
+ if prefixAndCtr[0]+"/" != v1.SeccompContainerAnnotationKeyPrefix {
+ continue
+ } else if len(prefixAndCtr) != 2 {
+ // this could be caused by a user inputting either of
+ // container.seccomp.security.alpha.kubernetes.io{,/}
+ // both of which are invalid
+ return nil, errors.Errorf("Invalid seccomp path: %s", prefixAndCtr[0])
+ }
+
+ path, err := verifySeccompPath(seccomp, profileRoot)
+ if err != nil {
+ return nil, err
+ }
+ seccompPaths.containerPaths[prefixAndCtr[1]] = path
+ }
+
+ podSeccomp, ok := annotations[v1.SeccompPodAnnotationKey]
+ if ok {
+ seccompPaths.podPath, err = verifySeccompPath(podSeccomp, profileRoot)
+ } else {
+ seccompPaths.podPath, err = libpod.DefaultSeccompPath()
+ }
+ if err != nil {
+ return nil, err
+ }
+ }
+ return seccompPaths, nil
+}
+
+// verifySeccompPath takes a path and checks whether it is a default, unconfined, or a path
+// the available options are parsed as defined in https://kubernetes.io/docs/concepts/policy/pod-security-policy/#seccomp
+func verifySeccompPath(path string, profileRoot string) (string, error) {
+ switch path {
+ case v1.DeprecatedSeccompProfileDockerDefault:
+ fallthrough
+ case v1.SeccompProfileRuntimeDefault:
+ return libpod.DefaultSeccompPath()
+ case "unconfined":
+ return path, nil
+ default:
+ parts := strings.Split(path, "/")
+ if parts[0] == "localhost" {
+ return filepath.Join(profileRoot, parts[1]), nil
+ }
+ return "", errors.Errorf("invalid seccomp path: %s", path)
+ }
+}
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-05 23:29:55 +0000