allow leading dots in secret keys

pkg/api/types.go

@@ -1825,7 +1825,8 @@ type Secret struct {
 	TypeMeta   `json:",inline"`
 	ObjectMeta `json:"metadata,omitempty"`
 
-	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.
+	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN
+	// or leading dot followed by valid DNS_SUBDOMAIN.
 	// The serialized form of the secret data is a base64 encoded string,
 	// representing the arbitrary (possibly non-string) data value here.
 	Data map[string][]byte `json:"data,omitempty"`

pkg/api/v1/types.go

@@ -1722,10 +1722,11 @@ type Secret struct {
 	TypeMeta   `json:",inline"`
 	ObjectMeta `json:"metadata,omitempty" description:"standard object metadata; see http://docs.k8s.io/api-conventions.md#metadata"`
 
-	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.
+	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN
+	// or leading dot followed by valid DNS_SUBDOMAIN.
 	// The serialized form of the secret data is a base64 encoded string,
 	// representing the arbitrary (possibly non-string) data value here.
-	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string"`
+	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN or leading dot followed by valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string as described in https://tools.ietf.org/html/rfc4648#section-4"`
 
 	// Used to facilitate programmatic handling of secret data.
 	Type SecretType `json:"type,omitempty" description:"type facilitates programmatic handling of secret data"`

pkg/api/v1beta1/types.go

@@ -1625,10 +1625,11 @@ type NFSVolumeSource struct {
 type Secret struct {
 	TypeMeta `json:",inline"`
 
-	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.
+	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN
+	// or leading dot followed by valid DNS_SUBDOMAIN.
 	// The serialized form of the secret data is a base64 encoded string,
 	// representing the arbitrary (possibly non-string) data value here.
-	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string"`
+	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN or leading dot followed by valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string as described in https://tools.ietf.org/html/rfc4648#section-4"`
 
 	// Used to facilitate programmatic handling of secret data.
 	Type SecretType `json:"type,omitempty" description:"type facilitates programmatic handling of secret data"`

pkg/api/v1beta2/types.go

@@ -1702,10 +1702,11 @@ type NFSVolumeSource struct {
 type Secret struct {
 	TypeMeta `json:",inline"`
 
-	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.
+	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN
+	// or leading dot followed by valid DNS_SUBDOMAIN.
 	// The serialized form of the secret data is a base64 encoded string,
 	// representing the arbitrary (possibly non-string) data value here.
-	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string"`
+	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN or leading dot followed by valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string as described in https://tools.ietf.org/html/rfc4648#section-4"`
 
 	// Used to facilitate programmatic handling of secret data.
 	Type SecretType `json:"type,omitempty" description:"type facilitates programmatic handling of secret data"`

pkg/api/v1beta3/types.go

@@ -1722,10 +1722,11 @@ type Secret struct {
 	TypeMeta   `json:",inline"`
 	ObjectMeta `json:"metadata,omitempty" description:"standard object metadata; see http://docs.k8s.io/api-conventions.md#metadata"`
 
-	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.
+	// Data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN
+	// or leading dot followed by valid DNS_SUBDOMAIN.
 	// The serialized form of the secret data is a base64 encoded string,
 	// representing the arbitrary (possibly non-string) data value here.
-	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string"`
+	Data map[string][]byte `json:"data,omitempty" description:"data contains the secret data.  Each key must be a valid DNS_SUBDOMAIN or leading dot followed by valid DNS_SUBDOMAIN.  Each value must be a base64 encoded string as described in https://tools.ietf.org/html/rfc4648#section-4"`
 
 	// Used to facilitate programmatic handling of secret data.
 	Type SecretType `json:"type,omitempty" description:"type facilitates programmatic handling of secret data"`

pkg/api/validation/validation.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"net"
 	"path"
+	"regexp"
 	"strings"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
@@ -1257,6 +1258,16 @@ func ValidateServiceAccountUpdate(oldServiceAccount, newServiceAccount *api.Serv
 	return allErrs
 }
 
+const SecretKeyFmt string = "\\.?" + util.DNS1123LabelFmt + "(\\." + util.DNS1123LabelFmt + ")*"
+
+var secretKeyRegexp = regexp.MustCompile("^" + SecretKeyFmt + "$")
+
+// IsSecretKey tests for a string that conforms to the definition of a
+// subdomain in DNS (RFC 1123), except that a leading dot is allowed
+func IsSecretKey(value string) bool {
+	return len(value) <= util.DNS1123SubdomainMaxLength && secretKeyRegexp.MatchString(value)
+}
+
 // ValidateSecret tests if required fields in the Secret are set.
 func ValidateSecret(secret *api.Secret) errs.ValidationErrorList {
 	allErrs := errs.ValidationErrorList{}
@@ -1264,8 +1275,8 @@ func ValidateSecret(secret *api.Secret) errs.ValidationErrorList {
 
 	totalSize := 0
 	for key, value := range secret.Data {
-		if !util.IsDNS1123Subdomain(key) {
-			allErrs = append(allErrs, errs.NewFieldInvalid(fmt.Sprintf("data[%s]", key), key, dnsSubdomainErrorMsg))
+		if !IsSecretKey(key) {
+			allErrs = append(allErrs, errs.NewFieldInvalid(fmt.Sprintf("data[%s]", key), key, fmt.Sprintf("must have at most %d characters and match regex %s", util.DNS1123SubdomainMaxLength, SecretKeyFmt)))
 		}
 
 		totalSize += len(value)

pkg/api/validation/validation_test.go

@@ -2869,12 +2869,15 @@ func TestValidateSecret(t *testing.T) {
 	}
 
 	var (
-		emptyName   = validSecret()
-		invalidName = validSecret()
-		emptyNs     = validSecret()
-		invalidNs   = validSecret()
-		overMaxSize = validSecret()
-		invalidKey  = validSecret()
+		emptyName     = validSecret()
+		invalidName   = validSecret()
+		emptyNs       = validSecret()
+		invalidNs     = validSecret()
+		overMaxSize   = validSecret()
+		invalidKey    = validSecret()
+		leadingDotKey = validSecret()
+		dotKey        = validSecret()
+		doubleDotKey  = validSecret()
 	)
 
 	emptyName.Name = ""
@@ -2885,6 +2888,9 @@ func TestValidateSecret(t *testing.T) {
 		"over": make([]byte, api.MaxSecretSize+1),
 	}
 	invalidKey.Data["a..b"] = []byte("whoops")
+	leadingDotKey.Data[".key"] = []byte("bar")
+	dotKey.Data["."] = []byte("bar")
+	doubleDotKey.Data[".."] = []byte("bar")
 
 	// kubernetes.io/service-account-token secret validation
 	validServiceAccountTokenSecret := func() api.Secret {
@@ -2916,18 +2922,20 @@ func TestValidateSecret(t *testing.T) {
 		secret api.Secret
 		valid  bool
 	}{
-		"valid":             {validSecret(), true},
-		"empty name":        {emptyName, false},
-		"invalid name":      {invalidName, false},
-		"empty namespace":   {emptyNs, false},
-		"invalid namespace": {invalidNs, false},
-		"over max size":     {overMaxSize, false},
-		"invalid key":       {invalidKey, false},
-
+		"valid":                                     {validSecret(), true},
+		"empty name":                                {emptyName, false},
+		"invalid name":                              {invalidName, false},
+		"empty namespace":                           {emptyNs, false},
+		"invalid namespace":                         {invalidNs, false},
+		"over max size":                             {overMaxSize, false},
+		"invalid key":                               {invalidKey, false},
 		"valid service-account-token secret":        {validServiceAccountTokenSecret(), true},
 		"empty service-account-token annotation":    {emptyTokenAnnotation, false},
 		"missing service-account-token annotation":  {missingTokenAnnotation, false},
 		"missing service-account-token annotations": {missingTokenAnnotations, false},
+		"leading dot key":                           {leadingDotKey, true},
+		"dot key":                                   {dotKey, false},
+		"double dot key":                            {doubleDotKey, false},
 	}
 
 	for name, tc := range tests {

pkg/registry/secret/etcd/etcd_test.go

@@ -63,7 +63,7 @@ func TestCreate(t *testing.T) {
 		},
 		&api.Secret{
 			ObjectMeta: api.ObjectMeta{Name: "name"},
-			Data:       map[string][]byte{".dotfile": []byte("")},
+			Data:       map[string][]byte{"~.dotfile": []byte("")},
 		},
 	)
 }