mirror of
https://github.com/kyverno/kyverno.git
synced 2024-12-15 17:51:20 +00:00
439 lines
8.9 KiB
Go
439 lines
8.9 KiB
Go
package pss
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"strings"
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"testing"
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kyvernov1 "github.com/kyverno/kyverno/api/kyverno/v1"
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corev1 "k8s.io/api/core/v1"
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fuzz "github.com/AdamKorcz/go-fuzz-headers-1"
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"golang.org/x/exp/slices"
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)
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var (
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allowedCapabilities = []corev1.Capability{"AUDIT_WRITE",
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"CHOWN",
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"DAC_OVERRIDE",
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"FOWNER",
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"FSETID",
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"KILL",
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"MKNOD",
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"NET_BIND_SERVICE",
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"SETFCAP",
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"SETGID",
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"SETPCAP",
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"SETUID",
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"SYS_CHROOT"}
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allowedSELinuxTypes = []string{"container_t",
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"container_init_t",
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"container_kvm_t",
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""}
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allowed_sysctls = []string{
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"kernel.shm_rmid_forced",
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"net.ipv4.ip_local_port_range",
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"net.ipv4.ip_unprivileged_port_start",
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"net.ipv4.tcp_syncookies",
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"net.ipv4.ping_group_range",
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}
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baselineV126Policy = []byte(`
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{
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"level": "baseline",
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"version": "v1.26"
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}`)
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baselineLatestPolicy = []byte(`
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{
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"level": "baseline",
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"version": "latest"
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}`)
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)
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func shouldBlockSELinuxUser(opts *corev1.SELinuxOptions) bool {
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if opts == nil {
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return false
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}
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fieldName := "User"
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value := reflect.ValueOf(opts)
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field := value.Elem().FieldByName(fieldName)
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if field.IsValid() {
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seLinuxUser := opts.User
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if seLinuxUser != "" {
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return true
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}
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}
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return false
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}
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func shouldBlockSELinuxRole(opts *corev1.SELinuxOptions) bool {
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if opts == nil {
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return false
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}
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fieldName := "Role"
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value := reflect.ValueOf(opts)
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field := value.Elem().FieldByName(fieldName)
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if field.IsValid() {
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seLinuxUser := opts.Role
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if seLinuxUser != "" {
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return true
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}
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}
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return false
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}
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func shouldAllowBaseline(pod *corev1.Pod) (bool, error) {
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spec := pod.Spec
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if len(spec.Volumes) > 0 {
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volumes := spec.Volumes
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for _, volume := range volumes {
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if volume.HostPath != nil {
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return false, nil
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}
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}
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}
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if len(pod.ObjectMeta.Annotations) > 0 {
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annotations := pod.ObjectMeta.Annotations
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for k, v := range annotations {
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if strings.HasPrefix(k, "container.apparmor.security.beta.kubernetes.io/") {
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if v != "runtime/default" && !strings.HasPrefix(v, "localhost/") {
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return false, nil
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}
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}
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}
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}
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if spec.SecurityContext != nil {
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sc := spec.SecurityContext
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if sc.WindowsOptions != nil {
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if sc.WindowsOptions.HostProcess != nil {
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if *sc.WindowsOptions.HostProcess == true {
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return false, nil
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}
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}
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}
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if shouldBlockContainerSELinux(sc.SELinuxOptions) {
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return false, nil
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}
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if sc.SeccompProfile != nil {
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seccompType := sc.SeccompProfile.Type
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defaultSeccomp := corev1.SeccompProfileTypeRuntimeDefault
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localhostSeccomp := corev1.SeccompProfileTypeLocalhost
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if seccompType != defaultSeccomp && seccompType != localhostSeccomp {
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return false, nil
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}
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}
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fieldName := "Sysctls"
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value := reflect.ValueOf(sc)
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field := value.Elem().FieldByName(fieldName)
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if field.IsValid() {
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for _, sysctl := range sc.Sysctls {
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if !slices.Contains(allowed_sysctls, sysctl.Name) {
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return false, nil
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}
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}
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}
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}
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if pod.Spec.Containers != nil || len(pod.Spec.Containers) != 0 {
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containers := pod.Spec.Containers
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for _, container := range containers {
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if container.SecurityContext != nil {
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if shouldBlockContainerSecurityContext(container.SecurityContext) {
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return false, nil
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}
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}
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fieldName := "Ports"
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value := reflect.ValueOf(container)
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field := value.FieldByName(fieldName)
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if field.IsValid() {
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if shouldBlockContainerPorts(container.Ports) {
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return false, nil
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}
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}
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}
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}
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if pod.Spec.InitContainers != nil || len(pod.Spec.InitContainers) != 0 {
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containers := pod.Spec.InitContainers
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for _, container := range containers {
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if container.SecurityContext != nil {
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if shouldBlockContainerSecurityContext(container.SecurityContext) {
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return false, nil
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}
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}
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fieldName := "Ports"
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value := reflect.ValueOf(container)
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field := value.FieldByName(fieldName)
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if field.IsValid() {
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if shouldBlockContainerPorts(container.Ports) {
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return false, nil
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}
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}
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}
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}
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if pod.Spec.EphemeralContainers != nil || len(pod.Spec.EphemeralContainers) != 0 {
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containers := pod.Spec.EphemeralContainers
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for _, container := range containers {
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if container.SecurityContext != nil {
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if shouldBlockContainerSecurityContext(container.SecurityContext) {
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return false, nil
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}
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}
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fieldName := "Ports"
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value := reflect.ValueOf(container)
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field := value.FieldByName(fieldName)
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if field.IsValid() {
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if shouldBlockContainerPorts(container.Ports) {
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return false, nil
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}
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}
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}
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}
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if spec.SecurityContext != nil {
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fieldName := "HostNetwork"
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value := reflect.ValueOf(spec)
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field := value.FieldByName(fieldName)
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if field.IsValid() {
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if spec.HostNetwork == true {
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return false, nil
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}
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}
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fieldName = "HostPID"
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field = value.FieldByName(fieldName)
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if field.IsValid() {
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if spec.HostPID == true {
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return false, nil
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}
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}
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fieldName = "HostIPC"
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field = value.FieldByName(fieldName)
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if field.IsValid() {
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if spec.HostIPC == true {
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return false, nil
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}
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}
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}
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return true, nil
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}
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func shouldBlockContainerSecurityContext(sc *corev1.SecurityContext) bool {
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if sc.WindowsOptions != nil {
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if sc.WindowsOptions.HostProcess != nil {
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if *sc.WindowsOptions.HostProcess == true {
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return true
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}
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}
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}
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if sc.Privileged != nil {
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if *sc.Privileged == true {
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return true
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}
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}
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if sc.Capabilities != nil {
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capabilities := sc.Capabilities
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if shouldBlockBaselineCapabilities(capabilities) {
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return true
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}
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}
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if sc.SELinuxOptions != nil {
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seLinuxOptions := sc.SELinuxOptions
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if shouldBlockContainerSELinux(seLinuxOptions) {
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return true
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}
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}
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if sc.ProcMount != nil {
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if *sc.ProcMount != corev1.DefaultProcMount {
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return true
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}
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}
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if sc.SeccompProfile != nil {
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seccompType := sc.SeccompProfile.Type
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defaultSeccomp := corev1.SeccompProfileTypeRuntimeDefault
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localhostSeccomp := corev1.SeccompProfileTypeLocalhost
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if seccompType != defaultSeccomp && seccompType != localhostSeccomp {
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return true
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}
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}
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return false
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}
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func shouldBlockContainerSELinux(opts *corev1.SELinuxOptions) bool {
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if opts == nil {
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return false
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}
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fieldName := "Type"
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value := reflect.ValueOf(opts)
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field := value.Elem().FieldByName(fieldName)
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if field.IsValid() {
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seLinuxType := opts.Type
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if !slices.Contains(allowedSELinuxTypes, seLinuxType) {
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return true
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}
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}
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if shouldBlockSELinuxUser(opts) {
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return true
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}
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if shouldBlockSELinuxRole(opts) {
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return true
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}
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return false
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}
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func shouldBlockContainerPorts(ports []corev1.ContainerPort) bool {
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if len(ports) > 0 {
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for _, port := range ports {
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fieldName := "HostPort"
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value := reflect.ValueOf(port)
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field := value.FieldByName(fieldName)
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if field.IsValid() {
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if port.HostPort != 0 {
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return true
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}
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}
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}
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}
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return false
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}
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func shouldBlockBaselineCapabilities(capabilities *corev1.Capabilities) bool {
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fieldName := "Add"
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value := reflect.ValueOf(capabilities)
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field := value.Elem().FieldByName(fieldName)
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if field.IsValid() {
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if len(capabilities.Add) > 0 {
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for _, capability := range capabilities.Add {
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if !slices.Contains(allowedCapabilities, capability) {
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return true
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}
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}
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}
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}
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return false
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}
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func getPod(ff *fuzz.ConsumeFuzzer) (*corev1.Pod, error) {
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pod := &corev1.Pod{}
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err := ff.GenerateStruct(pod)
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pod.Kind = "Pod"
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pod.APIVersion = "v1"
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return pod, err
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}
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var (
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baselineV124Rule, baselineLatestRule kyvernov1.PodSecurity
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)
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func init() {
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err := json.Unmarshal(baselineV126Policy, &baselineV124Rule)
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if err != nil {
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panic(err)
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}
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err = json.Unmarshal(baselineLatestPolicy, &baselineLatestRule)
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if err != nil {
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panic(err)
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}
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}
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func FuzzBaselinePS(f *testing.F) {
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f.Fuzz(func(t *testing.T, data []byte) {
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ff := fuzz.NewConsumer(data)
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pod, err := getPod(ff)
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if err != nil {
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return
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}
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if len(pod.ObjectMeta.Annotations) > 0 {
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for k, v := range pod.ObjectMeta.Annotations {
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for _, r := range k {
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if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') && (r < '0' || r > '9') && (r != '-' && r != '/' && r != '_' && r != ',' && r != '.') {
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return
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}
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}
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for _, r := range v {
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if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') && (r < '0' || r > '9') && (r != '-' && r != '/' && r != '_' && r != ',' && r != '.') {
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return
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}
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}
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}
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}
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var allowPod bool
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allowPod, _ = shouldAllowBaseline(pod)
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if allowPod {
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return
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}
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policyToCheck, err := ff.GetInt()
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if err != nil {
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return
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}
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var rule kyvernov1.PodSecurity
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switch policyToCheck % 2 {
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case 0:
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rule = baselineV124Rule
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case 1:
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rule = baselineLatestRule
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}
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levelVersion, _ := ParseVersion(rule.Level, rule.Version)
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allowed, _ := EvaluatePod(levelVersion, rule.Exclude, pod)
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if allowPod != allowed {
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pJson, err := json.MarshalIndent(pod, "", "")
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if err != nil {
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panic(err)
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}
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fmt.Println(string(pJson))
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fmt.Println("policyToCheck: ", policyToCheck%2)
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fmt.Println("allowed: ", allowed, "allowPod: ", allowPod)
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panic("They don't correlate")
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}
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})
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}
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