211 lines
8.1 KiB
Go
211 lines
8.1 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package egressselector
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"strings"
|
|
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/apimachinery/pkg/util/validation/field"
|
|
"k8s.io/apiserver/pkg/apis/apiserver"
|
|
"k8s.io/apiserver/pkg/apis/apiserver/install"
|
|
"k8s.io/apiserver/pkg/apis/apiserver/v1alpha1"
|
|
"k8s.io/utils/path"
|
|
"sigs.k8s.io/yaml"
|
|
)
|
|
|
|
var cfgScheme = runtime.NewScheme()
|
|
|
|
func init() {
|
|
install.Install(cfgScheme)
|
|
}
|
|
|
|
// ReadEgressSelectorConfiguration reads the egress selector configuration at the specified path.
|
|
// It returns the loaded egress selector configuration if the input file aligns with the required syntax.
|
|
// If it does not align with the provided syntax, it returns a default configuration which should function as a no-op.
|
|
// It does this by returning a nil configuration, which preserves backward compatibility.
|
|
// This works because prior to this there was no egress selector configuration.
|
|
// It returns an error if the file did not exist.
|
|
func ReadEgressSelectorConfiguration(configFilePath string) (*apiserver.EgressSelectorConfiguration, error) {
|
|
if configFilePath == "" {
|
|
return nil, nil
|
|
}
|
|
// a file was provided, so we just read it.
|
|
data, err := ioutil.ReadFile(configFilePath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("unable to read egress selector configuration from %q [%v]", configFilePath, err)
|
|
}
|
|
var decodedConfig v1alpha1.EgressSelectorConfiguration
|
|
err = yaml.Unmarshal(data, &decodedConfig)
|
|
if err != nil {
|
|
// we got an error where the decode wasn't related to a missing type
|
|
return nil, err
|
|
}
|
|
if decodedConfig.Kind != "EgressSelectorConfiguration" {
|
|
return nil, fmt.Errorf("invalid service configuration object %q", decodedConfig.Kind)
|
|
}
|
|
internalConfig := &apiserver.EgressSelectorConfiguration{}
|
|
if err := cfgScheme.Convert(&decodedConfig, internalConfig, nil); err != nil {
|
|
// we got an error where the decode wasn't related to a missing type
|
|
return nil, err
|
|
}
|
|
return internalConfig, nil
|
|
}
|
|
|
|
// ValidateEgressSelectorConfiguration checks the apiserver.EgressSelectorConfiguration for
|
|
// common configuration errors. It will return error for problems such as configuring mtls/cert
|
|
// settings for protocol which do not support security. It will also try to catch errors such as
|
|
// incorrect file paths. It will return nil if it does not find anything wrong.
|
|
func ValidateEgressSelectorConfiguration(config *apiserver.EgressSelectorConfiguration) field.ErrorList {
|
|
allErrs := field.ErrorList{}
|
|
if config == nil {
|
|
return allErrs // Treating a nil configuration as valid
|
|
}
|
|
for _, service := range config.EgressSelections {
|
|
base := field.NewPath("service", "connection")
|
|
switch service.Connection.ProxyProtocol {
|
|
case apiserver.ProtocolDirect:
|
|
allErrs = append(allErrs, validateDirectConnection(service.Connection, base)...)
|
|
case apiserver.ProtocolHTTPConnect:
|
|
if service.Connection.Transport.TCP != nil && service.Connection.Transport.UDS != nil {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
base.Child("tcp"),
|
|
service.Connection.Transport.TCP,
|
|
"TCP and UDS cannot both be set"))
|
|
} else if service.Connection.Transport.TCP == nil && service.Connection.Transport.UDS == nil {
|
|
allErrs = append(allErrs, field.Required(
|
|
base.Child("tcp"),
|
|
"One of TCP or UDS must be set"))
|
|
} else if service.Connection.Transport.TCP != nil {
|
|
allErrs = append(allErrs, validateTCPConnection(service.Connection, base)...)
|
|
} else if service.Connection.Transport.UDS != nil {
|
|
allErrs = append(allErrs, validateUDSConnection(service.Connection, base)...)
|
|
}
|
|
case apiserver.ProtocolGRPC:
|
|
if service.Connection.Transport.UDS != nil {
|
|
allErrs = append(allErrs, validateUDSConnection(service.Connection, base)...)
|
|
} else {
|
|
allErrs = append(allErrs, field.NotSupported(
|
|
base.Child("protocol"),
|
|
service.Connection.ProxyProtocol,
|
|
[]string{"uds"}))
|
|
}
|
|
default:
|
|
allErrs = append(allErrs, field.NotSupported(
|
|
base.Child("protocol"),
|
|
service.Connection.ProxyProtocol,
|
|
[]string{"direct", "HTTPConnect", "grpc"}))
|
|
}
|
|
}
|
|
|
|
return allErrs
|
|
}
|
|
|
|
func validateDirectConnection(connection apiserver.Connection, fldPath *field.Path) field.ErrorList {
|
|
if connection.Transport != nil {
|
|
return field.ErrorList{field.Invalid(
|
|
fldPath.Child("transport"),
|
|
"direct",
|
|
"Transport config should be absent for direct connect"),
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func validateUDSConnection(connection apiserver.Connection, fldPath *field.Path) field.ErrorList {
|
|
allErrs := field.ErrorList{}
|
|
if connection.Transport.UDS.UDSName == "" {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("udsName"),
|
|
"nil",
|
|
"UDSName should be present for UDS connections"))
|
|
}
|
|
return allErrs
|
|
}
|
|
|
|
func validateTCPConnection(connection apiserver.Connection, fldPath *field.Path) field.ErrorList {
|
|
allErrs := field.ErrorList{}
|
|
if connection.Transport.TCP.TLSConfig == nil {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig"),
|
|
"nil",
|
|
"TLSConfig config should be present for HTTPConnect via tcp"))
|
|
} else if strings.HasPrefix(connection.Transport.TCP.URL, "https://") {
|
|
if connection.Transport.TCP.TLSConfig.CABundle == "" {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "caBundle"),
|
|
"nil",
|
|
"HTTPConnect via https requires caBundle"))
|
|
} else if exists, err := path.Exists(path.CheckFollowSymlink, connection.Transport.TCP.TLSConfig.CABundle); exists == false || err != nil {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "caBundle"),
|
|
connection.Transport.TCP.TLSConfig.CABundle,
|
|
"HTTPConnect ca bundle does not exist"))
|
|
}
|
|
if connection.Transport.TCP.TLSConfig.ClientCert == "" {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "clientCert"),
|
|
"nil",
|
|
"HTTPConnect via https requires clientCert"))
|
|
} else if exists, err := path.Exists(path.CheckFollowSymlink, connection.Transport.TCP.TLSConfig.ClientCert); exists == false || err != nil {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "clientCert"),
|
|
connection.Transport.TCP.TLSConfig.ClientCert,
|
|
"HTTPConnect client cert does not exist"))
|
|
}
|
|
if connection.Transport.TCP.TLSConfig.ClientKey == "" {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "clientKey"),
|
|
"nil",
|
|
"HTTPConnect via https requires clientKey"))
|
|
} else if exists, err := path.Exists(path.CheckFollowSymlink, connection.Transport.TCP.TLSConfig.ClientKey); exists == false || err != nil {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "clientKey"),
|
|
connection.Transport.TCP.TLSConfig.ClientKey,
|
|
"HTTPConnect client key does not exist"))
|
|
}
|
|
} else if strings.HasPrefix(connection.Transport.TCP.URL, "http://") {
|
|
if connection.Transport.TCP.TLSConfig.CABundle != "" {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "caBundle"),
|
|
connection.Transport.TCP.TLSConfig.CABundle,
|
|
"HTTPConnect via http does not support caBundle"))
|
|
}
|
|
if connection.Transport.TCP.TLSConfig.ClientCert != "" {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "clientCert"),
|
|
connection.Transport.TCP.TLSConfig.ClientCert,
|
|
"HTTPConnect via http does not support clientCert"))
|
|
}
|
|
if connection.Transport.TCP.TLSConfig.ClientKey != "" {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("tlsConfig", "clientKey"),
|
|
connection.Transport.TCP.TLSConfig.ClientKey,
|
|
"HTTPConnect via http does not support clientKey"))
|
|
}
|
|
} else {
|
|
allErrs = append(allErrs, field.Invalid(
|
|
fldPath.Child("url"),
|
|
connection.Transport.TCP.URL,
|
|
"supported connection protocols are http:// and https://"))
|
|
}
|
|
return allErrs
|
|
}
|