112 lines
3.7 KiB
Go
112 lines
3.7 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package x509
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import (
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"crypto/x509"
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"net/http"
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"k8s.io/kubernetes/pkg/auth/user"
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"k8s.io/kubernetes/pkg/util/errors"
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)
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// UserConversion defines an interface for extracting user info from a client certificate chain
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type UserConversion interface {
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User(chain []*x509.Certificate) (user.Info, bool, error)
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}
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// UserConversionFunc is a function that implements the UserConversion interface.
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type UserConversionFunc func(chain []*x509.Certificate) (user.Info, bool, error)
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// User implements x509.UserConversion
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func (f UserConversionFunc) User(chain []*x509.Certificate) (user.Info, bool, error) {
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return f(chain)
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}
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// Authenticator implements request.Authenticator by extracting user info from verified client certificates
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type Authenticator struct {
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opts x509.VerifyOptions
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user UserConversion
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}
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// New returns a request.Authenticator that verifies client certificates using the provided
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// VerifyOptions, and converts valid certificate chains into user.Info using the provided UserConversion
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func New(opts x509.VerifyOptions, user UserConversion) *Authenticator {
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return &Authenticator{opts, user}
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}
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// AuthenticateRequest authenticates the request using presented client certificates
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func (a *Authenticator) AuthenticateRequest(req *http.Request) (user.Info, bool, error) {
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if req.TLS == nil {
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return nil, false, nil
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}
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var errlist []error
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for _, cert := range req.TLS.PeerCertificates {
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chains, err := cert.Verify(a.opts)
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if err != nil {
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errlist = append(errlist, err)
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continue
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}
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for _, chain := range chains {
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user, ok, err := a.user.User(chain)
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if err != nil {
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errlist = append(errlist, err)
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continue
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}
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if ok {
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return user, ok, err
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}
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}
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}
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return nil, false, errors.NewAggregate(errlist)
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}
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// DefaultVerifyOptions returns VerifyOptions that use the system root certificates, current time,
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// and requires certificates to be valid for client auth (x509.ExtKeyUsageClientAuth)
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func DefaultVerifyOptions() x509.VerifyOptions {
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return x509.VerifyOptions{
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KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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}
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}
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// CommonNameUserConversion builds user info from a certificate chain using the subject's CommonName
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var CommonNameUserConversion = UserConversionFunc(func(chain []*x509.Certificate) (user.Info, bool, error) {
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if len(chain[0].Subject.CommonName) == 0 {
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return nil, false, nil
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}
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return &user.DefaultInfo{Name: chain[0].Subject.CommonName}, true, nil
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})
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// DNSNameUserConversion builds user info from a certificate chain using the first DNSName on the certificate
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var DNSNameUserConversion = UserConversionFunc(func(chain []*x509.Certificate) (user.Info, bool, error) {
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if len(chain[0].DNSNames) == 0 {
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return nil, false, nil
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}
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return &user.DefaultInfo{Name: chain[0].DNSNames[0]}, true, nil
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})
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// EmailAddressUserConversion builds user info from a certificate chain using the first EmailAddress on the certificate
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var EmailAddressUserConversion = UserConversionFunc(func(chain []*x509.Certificate) (user.Info, bool, error) {
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if len(chain[0].EmailAddresses) == 0 {
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return nil, false, nil
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}
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return &user.DefaultInfo{Name: chain[0].EmailAddresses[0]}, true, nil
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})
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