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generate.go
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generate.go
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package processor
import (
"fmt"
"sysdig-labs/kube-psp-advisor/advisor/report"
"sysdig-labs/kube-psp-advisor/advisor/types"
"sysdig-labs/kube-psp-advisor/utils"
"time"
"k8s.io/api/core/v1"
"k8s.io/api/policy/v1beta1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
type Processor struct {
k8sClient *kubernetes.Clientset
resourceNamePrefix map[string]bool
namespace string
}
func NewProcessor(kubeconfig string) (*Processor, error) {
config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return &Processor{
k8sClient: clientset,
resourceNamePrefix: map[string]bool{},
}, nil
}
func (p *Processor) SetNamespace(ns string) {
p.namespace = ns
}
// GeneratePSP generate Pod Security Policy
func (p *Processor) GeneratePSP(cssList []types.ContainerSecuritySpec, pssList []types.PodSecuritySpec) *v1beta1.PodSecurityPolicy {
// no PSP will be generated if no security spec is provided
if len(cssList) == 0 && len(pssList) == 0 {
return nil
}
psp := &v1beta1.PodSecurityPolicy{}
psp.APIVersion = "policy/v1beta1"
psp.Kind = "PodSecurityPolicy"
addedCap := map[string]int{}
droppedCap := map[string]int{}
effectiveCap := map[string]bool{}
runAsUser := map[int64]bool{}
volumeTypes := map[string]bool{}
hostPaths := map[string]bool{}
runAsUserCount := 0
runAsNonRootCount := 0
notAllowPrivilegeEscationCount := 0
psp.Name = fmt.Sprintf("%s-%s", "pod-security-policy", time.Now().Format("20060102150405"))
for _, sc := range pssList {
psp.Spec.HostPID = psp.Spec.HostPID || sc.HostPID
psp.Spec.HostIPC = psp.Spec.HostIPC || sc.HostIPC
psp.Spec.HostNetwork = psp.Spec.HostNetwork || sc.HostNetwork
for _, t := range sc.VolumeTypes {
volumeTypes[t] = true
}
for _, path := range sc.MountHostPaths {
hostPaths[path] = true
}
}
for _, sc := range cssList {
for _, cap := range sc.Capabilities {
effectiveCap[cap] = true
}
for _, cap := range sc.AddedCap {
addedCap[cap]++
}
for _, cap := range sc.DroppedCap {
droppedCap[cap]++
}
psp.Spec.Privileged = psp.Spec.Privileged || sc.Privileged
psp.Spec.ReadOnlyRootFilesystem = psp.Spec.ReadOnlyRootFilesystem || sc.ReadOnlyRootFS
if sc.RunAsNonRoot != nil && *sc.RunAsNonRoot {
runAsNonRootCount++
}
if sc.RunAsUser != nil {
runAsUser[*sc.RunAsUser] = true
runAsUserCount++
}
if sc.AllowPrivilegeEscalation != nil && !*sc.AllowPrivilegeEscalation {
notAllowPrivilegeEscationCount++
}
}
// set allowedPrivilegeEscalation
if notAllowPrivilegeEscationCount == len(cssList) {
notAllowed := false
psp.Spec.AllowPrivilegeEscalation = ¬Allowed
}
// set runAsUser strategy
if runAsNonRootCount == len(cssList) {
psp.Spec.RunAsUser.Rule = v1beta1.RunAsUserStrategyMustRunAsNonRoot
}
if runAsUserCount == len(cssList) {
psp.Spec.RunAsUser.Rule = v1beta1.RunAsUserStrategyMustRunAs
for uid := range runAsUser {
if psp.Spec.RunAsUser.Rule == v1beta1.RunAsUserStrategyMustRunAsNonRoot && uid != 0 {
psp.Spec.RunAsUser.Ranges = append(psp.Spec.RunAsUser.Ranges, v1beta1.IDRange{
Min: uid,
Max: uid,
})
}
}
}
// set allowed host path
hostPathList := utils.MapToArray(hostPaths)
for _, path := range hostPathList {
psp.Spec.AllowedHostPaths = append(psp.Spec.AllowedHostPaths, v1beta1.AllowedHostPath{
PathPrefix: path,
})
}
// set limit volumes
volumeTypeList := utils.MapToArray(volumeTypes)
for _, v := range volumeTypeList {
psp.Spec.Volumes = append(psp.Spec.Volumes, v1beta1.FSType(v))
}
// set allowedCapabilities
defaultCap := utils.ArrayToMap(types.DefaultCaps)
for cap := range defaultCap {
if _, exists := effectiveCap[cap]; exists {
delete(effectiveCap, cap)
}
}
// set allowedAddCapabilities
for cap := range effectiveCap {
psp.Spec.AllowedCapabilities = append(psp.Spec.AllowedCapabilities, v1.Capability(cap))
}
// set defaultAddCapabilities
for k, v := range addedCap {
if v == len(cssList) {
psp.Spec.DefaultAddCapabilities = append(psp.Spec.DefaultAddCapabilities, v1.Capability(k))
}
}
// set requiredDroppedCapabilities
for k, v := range droppedCap {
if v == len(cssList) {
psp.Spec.RequiredDropCapabilities = append(psp.Spec.RequiredDropCapabilities, v1.Capability(k))
}
}
// set to default values
if string(psp.Spec.RunAsUser.Rule) == "" {
psp.Spec.RunAsUser.Rule = v1beta1.RunAsUserStrategyRunAsAny
}
if psp.Spec.RunAsGroup != nil && string(psp.Spec.RunAsGroup.Rule) == "" {
psp.Spec.RunAsGroup.Rule = v1beta1.RunAsGroupStrategyRunAsAny
}
if string(psp.Spec.FSGroup.Rule) == "" {
psp.Spec.FSGroup.Rule = v1beta1.FSGroupStrategyRunAsAny
}
if string(psp.Spec.SELinux.Rule) == "" {
psp.Spec.SELinux.Rule = v1beta1.SELinuxStrategyRunAsAny
}
if string(psp.Spec.SupplementalGroups.Rule) == "" {
psp.Spec.SupplementalGroups.Rule = v1beta1.SupplementalGroupsStrategyRunAsAny
}
return psp
}
func (p *Processor) GenerateReport(cssList []types.ContainerSecuritySpec, pssList []types.PodSecuritySpec) *report.Report {
r := report.NewReport()
for _, c := range cssList {
r.AddContainer(c)
}
for _, p := range pssList {
r.AddPod(p)
}
return r
}
// GetSecuritySpec security posture
func (p *Processor) GetSecuritySpec() ([]types.ContainerSecuritySpec, []types.PodSecuritySpec, error) {
cssList := []types.ContainerSecuritySpec{}
pssList := []types.PodSecuritySpec{}
// get security spec from dameonset
cspList0, pspList0, err := p.getSecuritySpecFromDaemonSets()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cspList0...)
pssList = append(pssList, pspList0...)
// get security spec from deployments
cssList1, pssList1, err := p.getSecuritySpecFromDeployments()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cssList1...)
pssList = append(pssList, pssList1...)
// get security spec from replicasets
cssList2, pssList2, err := p.getSecuritySpecFromReplicaSets()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cssList2...)
pssList = append(pssList, pssList2...)
// get security spec from statefulsets
cssList3, pssList3, err := p.getSecuritySpecFromStatefulSets()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cssList3...)
pssList = append(pssList, pssList3...)
// get security spec from replication controller
cssList4, pssList4, err := p.getSecuritySpecFromReplicationController()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cssList4...)
pssList = append(pssList, pssList4...)
// get security spec from cron job
cssList5, pssList5, err := p.getSecuritySpecFromCronJobs()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cssList5...)
pssList = append(pssList, pssList5...)
// get security spec from job
cssList6, pssList6, err := p.getSecuritySpecFromJobs()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cssList6...)
pssList = append(pssList, pssList6...)
// get security spec from pods
cssList7, pssList7, err := p.getSecuritySpecFromPods()
if err != nil {
return cssList, pssList, err
}
cssList = append(cssList, cssList7...)
pssList = append(pssList, pssList7...)
return cssList, pssList, nil
}