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apply_command.go
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apply_command.go
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package apply
import (
"fmt"
"os"
"path/filepath"
"strings"
"time"
"github.com/go-git/go-billy/v5/memfs"
client "github.com/kyverno/kyverno/pkg/dclient"
"github.com/kyverno/kyverno/pkg/kyverno/common"
sanitizederror "github.com/kyverno/kyverno/pkg/kyverno/sanitizedError"
"github.com/kyverno/kyverno/pkg/kyverno/store"
"github.com/kyverno/kyverno/pkg/openapi"
policy2 "github.com/kyverno/kyverno/pkg/policy"
"github.com/kyverno/kyverno/pkg/policyreport"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/cli-runtime/pkg/genericclioptions"
log "sigs.k8s.io/controller-runtime/pkg/log"
yaml1 "sigs.k8s.io/yaml"
)
type Resource struct {
Name string `json:"name"`
Values map[string]string `json:"values"`
}
type Policy struct {
Name string `json:"name"`
Resources []Resource `json:"resources"`
}
type Values struct {
Policies []Policy `json:"policies"`
}
type SkippedInvalidPolicies struct {
skipped []string
invalid []string
}
var applyHelp = `
To apply on a resource:
kyverno apply /path/to/policy.yaml /path/to/folderOfPolicies --resource=/path/to/resource1 --resource=/path/to/resource2
To apply on a cluster:
kyverno apply /path/to/policy.yaml /path/to/folderOfPolicies --cluster
To apply policy with variables:
1. To apply single policy with variable on single resource use flag "set".
Example:
kyverno apply /path/to/policy.yaml --resource /path/to/resource.yaml --set <variable1>=<value1>,<variable2>=<value2>
2. To apply multiple policy with variable on multiple resource use flag "values_file".
Example:
kyverno apply /path/to/policy1.yaml /path/to/policy2.yaml --resource /path/to/resource1.yaml --resource /path/to/resource2.yaml -f /path/to/value.yaml
Format of value.yaml:
policies:
- name: <policy1 name>
rules:
- name: <rule1 name>
values:
<context variable1 in policy1 rule1>: <value>
<context variable2 in policy1 rule1>: <value>
- name: <rule2 name>
values:
<context variable1 in policy1 rule2>: <value>
<context variable2 in policy1 rule2>: <value>
resources:
- name: <resource1 name>
values:
<variable1 in policy1>: <value>
<variable2 in policy1>: <value>
- name: <resource2 name>
values:
<variable1 in policy1>: <value>
<variable2 in policy1>: <value>
- name: <policy2 name>
resources:
- name: <resource1 name>
values:
<variable1 in policy2>: <value>
<variable2 in policy2>: <value>
- name: <resource2 name>
values:
<variable1 in policy2>: <value>
<variable2 in policy2>: <value>
namespaceSelector:
- name: <namespace1 name>
labels:
<label key>: <label value>
- name: <namespace2 name>
labels:
<label key>: <label value>
More info: https://kyverno.io/docs/kyverno-cli/
`
func Command() *cobra.Command {
var cmd *cobra.Command
var resourcePaths []string
var cluster, policyReport, stdin bool
var mutateLogPath, variablesString, valuesFile, namespace string
cmd = &cobra.Command{
Use: "apply",
Short: "applies policies on resources",
Example: applyHelp,
RunE: func(cmd *cobra.Command, policyPaths []string) (err error) {
defer func() {
if err != nil {
if !sanitizederror.IsErrorSanitized(err) {
log.Log.Error(err, "failed to sanitize")
err = fmt.Errorf("internal error")
}
}
}()
rc, resources, skipInvalidPolicies, pvInfos, err := applyCommandHelper(resourcePaths, cluster, policyReport, mutateLogPath, variablesString, valuesFile, namespace, policyPaths, stdin)
if err != nil {
return err
}
printReportOrViolation(policyReport, rc, resourcePaths, len(resources), skipInvalidPolicies, stdin, pvInfos)
return nil
},
}
cmd.Flags().StringArrayVarP(&resourcePaths, "resource", "r", []string{}, "Path to resource files")
cmd.Flags().BoolVarP(&cluster, "cluster", "c", false, "Checks if policies should be applied to cluster in the current context")
cmd.Flags().StringVarP(&mutateLogPath, "output", "o", "", "Prints the mutated resources in provided file/directory")
// currently `set` flag supports variable for single policy applied on single resource
cmd.Flags().StringVarP(&variablesString, "set", "s", "", "Variables that are required")
cmd.Flags().StringVarP(&valuesFile, "values-file", "f", "", "File containing values for policy variables")
cmd.Flags().BoolVarP(&policyReport, "policy-report", "", false, "Generates policy report when passed (default policyviolation r")
cmd.Flags().StringVarP(&namespace, "namespace", "n", "", "Optional Policy parameter passed with cluster flag")
cmd.Flags().BoolVarP(&stdin, "stdin", "i", false, "Optional mutate policy parameter to pipe directly through to kubectl")
return cmd
}
func applyCommandHelper(resourcePaths []string, cluster bool, policyReport bool, mutateLogPath string,
variablesString string, valuesFile string, namespace string, policyPaths []string, stdin bool) (rc *common.ResultCounts, resources []*unstructured.Unstructured, skipInvalidPolicies SkippedInvalidPolicies, pvInfos []policyreport.Info, err error) {
store.SetMock(true)
kubernetesConfig := genericclioptions.NewConfigFlags(true)
fs := memfs.New()
if valuesFile != "" && variablesString != "" {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("pass the values either using set flag or values_file flag", err)
}
variables, globalValMap, valuesMap, namespaceSelectorMap, err := common.GetVariable(variablesString, valuesFile, fs, false, "")
if err != nil {
if !sanitizederror.IsErrorSanitized(err) {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("failed to decode yaml", err)
}
return rc, resources, skipInvalidPolicies, pvInfos, err
}
openAPIController, err := openapi.NewOpenAPIController()
if err != nil {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("failed to initialize openAPIController", err)
}
var dClient *client.Client
if cluster {
restConfig, err := kubernetesConfig.ToRESTConfig()
if err != nil {
return rc, resources, skipInvalidPolicies, pvInfos, err
}
dClient, err = client.NewClient(restConfig, 15*time.Minute, make(chan struct{}), log.Log)
if err != nil {
return rc, resources, skipInvalidPolicies, pvInfos, err
}
}
if len(policyPaths) == 0 {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("require policy", err)
}
if (len(policyPaths) > 0 && policyPaths[0] == "-") && len(resourcePaths) > 0 && resourcePaths[0] == "-" {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("a stdin pipe can be used for either policies or resources, not both", err)
}
policies, err := common.GetPoliciesFromPaths(fs, policyPaths, false, "")
if err != nil {
fmt.Printf("Error: failed to load policies\nCause: %s\n", err)
os.Exit(1)
}
if len(resourcePaths) == 0 && !cluster {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("resource file(s) or cluster required", err)
}
mutateLogPathIsDir, err := checkMutateLogPath(mutateLogPath)
if err != nil {
if !sanitizederror.IsErrorSanitized(err) {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("failed to create file/folder", err)
}
return rc, resources, skipInvalidPolicies, pvInfos, err
}
// empty the previous contents of the file just in case if the file already existed before with some content(so as to perform overwrites)
// the truncation of files for the case when mutateLogPath is dir, is handled under pkg/kyverno/apply/common.go
if !mutateLogPathIsDir && mutateLogPath != "" {
mutateLogPath = filepath.Clean(mutateLogPath)
// Necessary for us to include the file via variable as it is part of the CLI.
_, err := os.OpenFile(mutateLogPath, os.O_TRUNC|os.O_WRONLY, 0600) // #nosec G304
if err != nil {
if !sanitizederror.IsErrorSanitized(err) {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("failed to truncate the existing file at "+mutateLogPath, err)
}
return rc, resources, skipInvalidPolicies, pvInfos, err
}
}
mutatedPolicies, err := common.MutatePolices(policies)
if err != nil {
if !sanitizederror.IsErrorSanitized(err) {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("failed to mutate policy", err)
}
}
err = common.PrintMutatedPolicy(mutatedPolicies)
if err != nil {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("failed to marsal mutated policy", err)
}
resources, err = common.GetResourceAccordingToResourcePath(fs, resourcePaths, cluster, mutatedPolicies, dClient, namespace, policyReport, false, "")
if err != nil {
fmt.Printf("Error: failed to load resources\nCause: %s\n", err)
os.Exit(1)
}
if (len(resources) > 1 || len(mutatedPolicies) > 1) && variablesString != "" {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError("currently `set` flag supports variable for single policy applied on single resource ", nil)
}
if variablesString != "" {
variables = common.SetInStoreContext(mutatedPolicies, variables)
}
msgPolicies := "1 policy"
if len(mutatedPolicies) > 1 {
msgPolicies = fmt.Sprintf("%d policies", len(policies))
}
msgResources := "1 resource"
if len(resources) > 1 {
msgResources = fmt.Sprintf("%d resources", len(resources))
}
if len(mutatedPolicies) > 0 && len(resources) > 0 {
if !stdin {
fmt.Printf("\nApplying %s to %s... \n(Total number of result count may vary as the policy is mutated by Kyverno. To check the mutated policy please try with log level 5)\n", msgPolicies, msgResources)
}
}
rc = &common.ResultCounts{}
skipInvalidPolicies.skipped = make([]string, 0)
skipInvalidPolicies.invalid = make([]string, 0)
for _, policy := range mutatedPolicies {
err := policy2.Validate(policy, nil, true, openAPIController)
if err != nil {
log.Log.Error(err, "policy validation error")
if strings.HasPrefix(err.Error(), "variable 'element.name'") {
skipInvalidPolicies.invalid = append(skipInvalidPolicies.invalid, policy.Name)
} else {
skipInvalidPolicies.skipped = append(skipInvalidPolicies.skipped, policy.Name)
}
continue
}
matches := common.HasVariables(policy)
variable := common.RemoveDuplicateAndObjectVariables(matches)
if len(variable) > 0 {
if len(variables) == 0 {
// check policy in variable file
if valuesFile == "" || valuesMap[policy.Name] == nil {
skipInvalidPolicies.skipped = append(skipInvalidPolicies.skipped, policy.Name)
continue
}
}
}
kindOnwhichPolicyIsApplied := common.GetKindsFromPolicy(policy)
for _, resource := range resources {
thisPolicyResourceValues, err := common.CheckVariableForPolicy(valuesMap, globalValMap, policy.GetName(), resource.GetName(), resource.GetKind(), variables, kindOnwhichPolicyIsApplied, variable)
if err != nil {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError(fmt.Sprintf("policy `%s` have variables. pass the values for the variables for resource `%s` using set/values_file flag", policy.Name, resource.GetName()), err)
}
_, info, err := common.ApplyPolicyOnResource(policy, resource, mutateLogPath, mutateLogPathIsDir, thisPolicyResourceValues, policyReport, namespaceSelectorMap, stdin, rc, true)
if err != nil {
return rc, resources, skipInvalidPolicies, pvInfos, sanitizederror.NewWithError(fmt.Errorf("failed to apply policy %v on resource %v", policy.Name, resource.GetName()).Error(), err)
}
pvInfos = append(pvInfos, info)
}
}
return rc, resources, skipInvalidPolicies, pvInfos, nil
}
// checkMutateLogPath - checking path for printing mutated resource (-o flag)
func checkMutateLogPath(mutateLogPath string) (mutateLogPathIsDir bool, err error) {
if mutateLogPath != "" {
spath := strings.Split(mutateLogPath, "/")
sfileName := strings.Split(spath[len(spath)-1], ".")
if sfileName[len(sfileName)-1] == "yml" || sfileName[len(sfileName)-1] == "yaml" {
mutateLogPathIsDir = false
} else {
mutateLogPathIsDir = true
}
err := createFileOrFolder(mutateLogPath, mutateLogPathIsDir)
if err != nil {
if !sanitizederror.IsErrorSanitized(err) {
return mutateLogPathIsDir, sanitizederror.NewWithError("failed to create file/folder.", err)
}
return mutateLogPathIsDir, err
}
}
return mutateLogPathIsDir, err
}
// printReportOrViolation - printing policy report/violations
func printReportOrViolation(policyReport bool, rc *common.ResultCounts, resourcePaths []string, resourcesLen int, skipInvalidPolicies SkippedInvalidPolicies, stdin bool, pvInfos []policyreport.Info) {
divider := "----------------------------------------------------------------------"
if len(skipInvalidPolicies.skipped) > 0 {
fmt.Println(divider)
fmt.Println("Policies Skipped (as required variables are not provided by the user):")
for i, policyName := range skipInvalidPolicies.skipped {
fmt.Printf("%d. %s\n", i+1, policyName)
}
fmt.Println(divider)
}
if len(skipInvalidPolicies.invalid) > 0 {
fmt.Println(divider)
fmt.Println("Invalid Policies:")
for i, policyName := range skipInvalidPolicies.invalid {
fmt.Printf("%d. %s\n", i+1, policyName)
}
fmt.Println(divider)
}
if policyReport {
resps := buildPolicyReports(pvInfos)
if len(resps) > 0 || resourcesLen == 0 {
fmt.Println(divider)
fmt.Println("POLICY REPORT:")
fmt.Println(divider)
report, _ := generateCLIRaw(resps)
yamlReport, _ := yaml1.Marshal(report)
fmt.Println(string(yamlReport))
} else {
fmt.Println(divider)
fmt.Println("POLICY REPORT: skip generating policy report (no validate policy found/resource skipped)")
}
} else {
if !stdin {
fmt.Printf("\npass: %d, fail: %d, warn: %d, error: %d, skip: %d \n",
rc.Pass, rc.Fail, rc.Warn, rc.Error, rc.Skip)
}
}
if rc.Fail > 0 || rc.Error > 0 {
os.Exit(1)
}
}
// createFileOrFolder - creating file or folder according to path provided
func createFileOrFolder(mutateLogPath string, mutateLogPathIsDir bool) error {
mutateLogPath = filepath.Clean(mutateLogPath)
_, err := os.Stat(mutateLogPath)
if err != nil {
if os.IsNotExist(err) {
if !mutateLogPathIsDir {
// check the folder existence, then create the file
var folderPath string
s := strings.Split(mutateLogPath, "/")
if len(s) > 1 {
folderPath = mutateLogPath[:len(mutateLogPath)-len(s[len(s)-1])-1]
_, err := os.Stat(folderPath)
if os.IsNotExist(err) {
errDir := os.MkdirAll(folderPath, 0750)
if errDir != nil {
return sanitizederror.NewWithError("failed to create directory", err)
}
}
}
mutateLogPath = filepath.Clean(mutateLogPath)
// Necessary for us to create the file via variable as it is part of the CLI.
file, err := os.OpenFile(mutateLogPath, os.O_RDONLY|os.O_CREATE, 0600) // #nosec G304
if err != nil {
return sanitizederror.NewWithError("failed to create file", err)
}
err = file.Close()
if err != nil {
return sanitizederror.NewWithError("failed to close file", err)
}
} else {
errDir := os.MkdirAll(mutateLogPath, 0750)
if errDir != nil {
return sanitizederror.NewWithError("failed to create directory", err)
}
}
} else {
return sanitizederror.NewWithError("failed to describe file", err)
}
}
return nil
}