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secret.go
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secret.go
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package secrets
import (
"context"
"crypto/rand"
"fmt"
"math/big"
"regexp"
"sort"
"strings"
apiv1 "github.com/acorn-io/acorn/pkg/apis/api.acorn.io/v1"
v1 "github.com/acorn-io/acorn/pkg/apis/internal.acorn.io/v1"
"github.com/acorn-io/acorn/pkg/encryption/nacl"
"github.com/acorn-io/acorn/pkg/images"
"github.com/acorn-io/acorn/pkg/jobs"
"github.com/acorn-io/acorn/pkg/labels"
"github.com/acorn-io/acorn/pkg/publicname"
"github.com/acorn-io/acorn/pkg/ref"
"github.com/acorn-io/acorn/pkg/system"
"github.com/acorn-io/baaah/pkg/router"
"github.com/acorn-io/baaah/pkg/typed"
"github.com/rancher/wrangler/pkg/data/convert"
"github.com/rancher/wrangler/pkg/merr"
"github.com/rancher/wrangler/pkg/randomtoken"
"golang.org/x/exp/maps"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
klabels "k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime/schema"
kclient "sigs.k8s.io/controller-runtime/pkg/client"
)
func seedData(existing *corev1.Secret, from map[string]string, keys ...string) map[string][]byte {
to := map[string][]byte{}
if existing != nil {
for _, key := range keys {
to[key] = existing.Data[key]
}
}
for _, key := range keys {
if v, ok := from[key]; ok {
// don't override a non-zero length value with zero length
if len(v) > 0 || len(to[key]) == 0 {
to[key] = []byte(v)
}
}
}
return to
}
var (
templateSecretRegexp = regexp.MustCompile(`\${secret://(.*?)/(.*?)}`)
imageSecretRegexp = regexp.MustCompile(`\${image://(.*?)}`)
)
func getTextSecretData(ctx context.Context, c kclient.Client, appInstance *v1.AppInstance, secretRef v1.Secret, secretName string) (*v1.Secret, error) {
var output string
err := jobs.GetOutputFor(ctx, c, appInstance, convert.ToString(secretRef.Params["job"]), secretName, &output)
if err != nil {
return nil, err
}
return &v1.Secret{
Data: map[string]string{
"content": output,
},
}, nil
}
func getJSONSecretData(ctx context.Context, c kclient.Client, appInstance *v1.AppInstance, secretRef v1.Secret, secretName string) (*v1.Secret, error) {
newSecret := &v1.Secret{}
err := jobs.GetOutputFor(ctx, c, appInstance, convert.ToString(secretRef.Params["job"]), secretName, newSecret)
if err != nil {
return nil, err
}
return newSecret, nil
}
func generatedSecret(req router.Request, appInstance *v1.AppInstance, secretName string, secretRef v1.Secret, existing *corev1.Secret) (*corev1.Secret, error) {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
GenerateName: secretName + "-",
Namespace: appInstance.Namespace,
Labels: labelsForSecret(secretName, appInstance, secretRef),
Annotations: annotationsForSecret(secretName, appInstance, secretRef),
},
Data: seedData(existing, secretRef.Data),
Type: v1.SecretTypeGenerated,
}
var (
newSecret *v1.Secret
format = convert.ToString(secretRef.Params["format"])
err error
)
switch format {
case "":
newSecret, err = getJSONSecretData(req.Ctx, req.Client, appInstance, secretRef, secretName)
if err != nil {
newSecret, err = getTextSecretData(req.Ctx, req.Client, appInstance, secretRef, secretName)
}
case "text":
newSecret, err = getTextSecretData(req.Ctx, req.Client, appInstance, secretRef, secretName)
case "aml":
fallthrough
case "json":
newSecret, err = getJSONSecretData(req.Ctx, req.Client, appInstance, secretRef, secretName)
default:
return nil, fmt.Errorf("invalid generated secret format [%s]", format)
}
if err != nil {
return nil, err
}
for k, v := range newSecret.Data {
secret.Data[k] = []byte(v)
}
if newSecret.Type != "" {
inType := corev1.SecretType(v1.SecretTypePrefix + newSecret.Type)
if v1.SecretTypes[inType] {
secret.Type = inType
}
}
return updateOrCreate(req, existing, secret)
}
func generateTemplate(secrets map[string]*corev1.Secret, req router.Request, appInstance *v1.AppInstance, secretName string, secretRef v1.Secret, existing *corev1.Secret) (*corev1.Secret, error) {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
GenerateName: secretName + "-",
Namespace: appInstance.Namespace,
Labels: labelsForSecret(secretName, appInstance, secretRef),
Annotations: annotationsForSecret(secretName, appInstance, secretRef),
},
Data: seedData(existing, secretRef.Data, typed.SortedKeys(secretRef.Data)...),
Type: v1.SecretTypeTemplate,
}
tag, err := images.GetRuntimePullableImageReference(req.Ctx, req.Client, appInstance.Namespace, appInstance.Status.AppImage.ID)
if err != nil {
return nil, err
}
tempInterpolator := NewInterpolator(req.Ctx, req.Client, appInstance)
for _, entry := range typed.Sorted(secret.Data) {
var (
template = string(entry.Value)
templateErrors []error
)
template = templateSecretRegexp.ReplaceAllStringFunc(template, func(t string) string {
groups := templateSecretRegexp.FindStringSubmatch(t)
secret, err := GetOrCreateSecret(secrets, req, appInstance, groups[1])
if err != nil {
templateErrors = append(templateErrors, err)
return err.Error()
}
val := secret.Data[groups[2]]
if len(val) == 0 {
err := fmt.Errorf("failed to find key %s in secret %s", groups[2], groups[1])
templateErrors = append(templateErrors, err)
return err.Error()
}
return string(val)
})
if err := merr.NewErrors(templateErrors...); err != nil {
return nil, err
}
template = imageSecretRegexp.ReplaceAllStringFunc(template, func(t string) string {
groups := imageSecretRegexp.FindStringSubmatch(t)
digest, ok := appInstance.Status.AppImage.ImageData.Images[groups[1]]
if !ok {
return t
}
return images.ResolveTag(tag, digest.Image)
})
template, err := tempInterpolator.replace(template)
if err != nil {
return nil, err
}
secret.Data[entry.Key] = []byte(template)
}
return updateOrCreate(req, existing, secret)
}
func generateToken(req router.Request, appInstance *v1.AppInstance, secretName string, secretRef v1.Secret, existing *corev1.Secret) (*corev1.Secret, error) {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
GenerateName: secretName + "-",
Namespace: appInstance.Namespace,
Labels: labelsForSecret(secretName, appInstance, secretRef),
Annotations: annotationsForSecret(secretName, appInstance, secretRef),
},
Data: seedData(existing, secretRef.Data, "token"),
Type: v1.SecretTypeToken,
}
if len(secret.Data["token"]) == 0 {
length, err := convert.ToNumber(secretRef.Params["length"])
if err != nil {
return nil, err
}
characters := convert.ToString(secretRef.Params["characters"])
v, err := generate(characters, int(length))
if err != nil {
return nil, err
}
secret.Data["token"] = []byte(v)
}
return updateOrCreate(req, existing, secret)
}
func generateOpaque(req router.Request, appInstance *v1.AppInstance, secretName string, secretRef v1.Secret, existing *corev1.Secret) (*corev1.Secret, error) {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
GenerateName: secretName + "-",
Namespace: appInstance.Namespace,
Labels: labelsForSecret(secretName, appInstance, secretRef),
Annotations: annotationsForSecret(secretName, appInstance, secretRef),
},
Data: seedData(existing, secretRef.Data, maps.Keys(secretRef.Data)...),
Type: v1.SecretTypeOpaque,
}
return updateOrCreate(req, existing, secret)
}
func generateBasic(req router.Request, appInstance *v1.AppInstance, secretName string, secretRef v1.Secret, existing *corev1.Secret) (*corev1.Secret, error) {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
GenerateName: secretName + "-",
Namespace: appInstance.Namespace,
Labels: labelsForSecret(secretName, appInstance, secretRef),
Annotations: annotationsForSecret(secretName, appInstance, secretRef),
},
Data: seedData(existing, secretRef.Data, corev1.BasicAuthUsernameKey, corev1.BasicAuthPasswordKey),
Type: v1.SecretTypeBasic,
}
for i, key := range []string{corev1.BasicAuthUsernameKey, corev1.BasicAuthPasswordKey} {
if len(secret.Data[key]) == 0 {
// TODO: Improve with more characters (special, upper/lowercase, etc)
v, err := randomtoken.Generate()
v = v[:(i+1)*8]
if err != nil {
return nil, err
}
secret.Data[key] = []byte(v)
}
}
return updateOrCreate(req, existing, secret)
}
func updateOrCreate(req router.Request, existing, secret *corev1.Secret) (result *corev1.Secret, err error) {
defer func() {
if err != nil || result == nil {
return
}
// The result secret should be decrypted, but the written secret in the app namespace should be encrypted
// if the source data was encrypted
result = result.DeepCopy()
result.Data, err = nacl.DecryptNamespacedDataMap(req.Ctx, req.Client, result.Data, result.Namespace)
if err != nil {
err = fmt.Errorf("decrypting %s/%s: %w", secret.Namespace, secret.Name, err)
}
}()
if existing == nil {
return secret, req.Client.Create(req.Ctx, secret)
}
if equality.Semantic.DeepEqual(existing.Data, secret.Data) && maps.Equal(existing.Labels, secret.Labels) &&
maps.Equal(existing.Annotations, secret.Annotations) {
return existing, nil
}
newSecret := existing.DeepCopy()
newSecret.Data = secret.Data
newSecret.Annotations = secret.Annotations
newSecret.Labels = secret.Labels
return newSecret, req.Client.Update(req.Ctx, newSecret)
}
func acornLabelsForSecret(secretName string, appInstance *v1.AppInstance) map[string]string {
return map[string]string{
labels.AcornAppName: appInstance.Name,
labels.AcornManaged: "true",
labels.AcornSecretName: secretName,
labels.AcornSecretGenerated: "true",
}
}
func labelsForSecret(secretName string, appInstance *v1.AppInstance, secretRef v1.Secret) map[string]string {
result := labels.Merge(acornLabelsForSecret(secretName, appInstance),
labels.GatherScoped(secretName, v1.LabelTypeSecret,
appInstance.Status.AppSpec.Labels, secretRef.Labels, appInstance.Spec.Labels))
return labels.Merge(result, map[string]string{
labels.AcornPublicName: publicname.ForChild(appInstance, secretName),
})
}
func annotationsForSecret(secretName string, appInstance *v1.AppInstance, secretRef v1.Secret) map[string]string {
return labels.GatherScoped(secretName, v1.LabelTypeSecret, appInstance.Status.AppSpec.Annotations, secretRef.Annotations,
appInstance.Spec.Annotations)
}
func getSecret(req router.Request, appInstance *v1.AppInstance, name string) (*corev1.Secret, error) {
l := acornLabelsForSecret(name, appInstance)
var secrets corev1.SecretList
err := req.List(&secrets, &kclient.ListOptions{
Namespace: appInstance.Namespace,
LabelSelector: klabels.SelectorFromSet(l),
})
if err != nil {
return nil, err
}
if len(secrets.Items) == 0 {
return nil, apierrors.NewNotFound(schema.GroupResource{
Group: "v1",
Resource: "secrets",
}, name)
}
sort.Slice(secrets.Items, func(i, j int) bool {
return secrets.Items[i].UID < secrets.Items[j].UID
})
return &secrets.Items[0], nil
}
func generateSecret(secrets map[string]*corev1.Secret, req router.Request, appInstance *v1.AppInstance, secretName string) (*corev1.Secret, error) {
existing, err := getSecret(req, appInstance, secretName)
if err != nil && !apierrors.IsNotFound(err) {
return nil, err
}
secretRef, ok := appInstance.Status.AppSpec.Secrets[secretName]
if !ok {
return nil, apierrors.NewNotFound(schema.GroupResource{
Group: "v1",
Resource: "secrets",
}, secretName)
}
switch secretRef.Type {
case "opaque":
return generateOpaque(req, appInstance, secretName, secretRef, existing)
case "basic":
return generateBasic(req, appInstance, secretName, secretRef, existing)
case "generated":
return generatedSecret(req, appInstance, secretName, secretRef, existing)
case "token":
return generateToken(req, appInstance, secretName, secretRef, existing)
case "template":
return generateTemplate(secrets, req, appInstance, secretName, secretRef, existing)
default:
return nil, err
}
}
func GetOrCreateSecret(secrets map[string]*corev1.Secret, req router.Request, appInstance *v1.AppInstance, secretName string) (*corev1.Secret, error) {
if sec, ok := secrets[secretName]; ok {
return sec, nil
}
secretRef := ""
refNamespace := appInstance.Namespace
for _, binding := range appInstance.Spec.Secrets {
if binding.Target == secretName {
secretRef = binding.Secret
}
}
if secretRef == "" {
secretDef := appInstance.Status.AppSpec.Secrets[secretName]
if secretDef.External != "" {
secretRef = secretDef.External
}
}
if secretRef == "" {
secretDef := appInstance.Status.AppSpec.Secrets[secretName]
if secretDef.Alias != "" {
secretRef = secretDef.Alias
refNamespace = appInstance.Status.Namespace
}
}
if secretRef == "" && strings.Contains(secretName, ".") {
refNamespace = appInstance.Status.Namespace
secretRef = secretName
}
if secretRef != "" {
if strings.HasPrefix(secretRef, "context://") {
existingSecret := &corev1.Secret{}
name := "context-" + strings.TrimPrefix(secretRef, "context://")
if err := req.Get(existingSecret, system.Namespace, name); err != nil {
return nil, err
}
if existingSecret.Type != apiv1.SecretTypeContext {
return nil, fmt.Errorf("found secrets %s/%s but type is [%s] and not [%s]",
system.Namespace, name, existingSecret.Type, apiv1.SecretTypeContext)
}
return existingSecret, nil
}
existingSecret := &corev1.Secret{}
err := ref.Lookup(req.Ctx, req.Client, existingSecret, refNamespace, strings.Split(secretRef, ".")...)
if err != nil {
return nil, err
}
existingSecret = existingSecret.DeepCopy()
existingSecret.Data, err = nacl.DecryptNamespacedDataMap(req.Ctx, req.Client, existingSecret.Data, appInstance.Namespace)
if err != nil {
return nil, err
}
secrets[secretName] = existingSecret
return existingSecret, nil
}
secret, err := generateSecret(secrets, req, appInstance, secretName)
if err != nil {
return nil, err
}
secrets[secretName] = secret
return secret, nil
}
func generate(characters string, tokenLength int) (string, error) {
token := make([]byte, tokenLength)
for i := range token {
r, err := rand.Int(rand.Reader, big.NewInt(int64(len(characters))))
if err != nil {
return "", err
}
token[i] = characters[r.Int64()]
}
return string(token), nil
}