mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
synced 2026-04-06 17:57:51 +00:00
a293b2bf94
Travis seems to be having issues pulling deps, so we'll have to check in the vendor directory and prevent the makefile from trying to regenerate it normally.
109 lines
3.4 KiB
Go
109 lines
3.4 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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 websocket
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import (
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"encoding/base64"
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"errors"
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"net/http"
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"net/textproto"
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"strings"
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"unicode/utf8"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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"k8s.io/apiserver/pkg/authentication/user"
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"k8s.io/apiserver/pkg/util/wsstream"
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)
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const bearerProtocolPrefix = "base64url.bearer.authorization.k8s.io."
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var protocolHeader = textproto.CanonicalMIMEHeaderKey("Sec-WebSocket-Protocol")
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var errInvalidToken = errors.New("invalid bearer token")
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// ProtocolAuthenticator allows a websocket connection to provide a bearer token as a subprotocol
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// in the format "base64url.bearer.authorization.<base64url-without-padding(bearer-token)>"
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type ProtocolAuthenticator struct {
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// auth is the token authenticator to use to validate the token
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auth authenticator.Token
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}
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func NewProtocolAuthenticator(auth authenticator.Token) *ProtocolAuthenticator {
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return &ProtocolAuthenticator{auth}
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}
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func (a *ProtocolAuthenticator) AuthenticateRequest(req *http.Request) (user.Info, bool, error) {
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// Only accept websocket connections
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if !wsstream.IsWebSocketRequest(req) {
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return nil, false, nil
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}
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token := ""
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sawTokenProtocol := false
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filteredProtocols := []string{}
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for _, protocolHeader := range req.Header[protocolHeader] {
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for _, protocol := range strings.Split(protocolHeader, ",") {
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protocol = strings.TrimSpace(protocol)
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if !strings.HasPrefix(protocol, bearerProtocolPrefix) {
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filteredProtocols = append(filteredProtocols, protocol)
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continue
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}
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if sawTokenProtocol {
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return nil, false, errors.New("multiple base64.bearer.authorization tokens specified")
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}
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sawTokenProtocol = true
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encodedToken := strings.TrimPrefix(protocol, bearerProtocolPrefix)
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decodedToken, err := base64.RawURLEncoding.DecodeString(encodedToken)
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if err != nil {
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return nil, false, errors.New("invalid base64.bearer.authorization token encoding")
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}
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if !utf8.Valid(decodedToken) {
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return nil, false, errors.New("invalid base64.bearer.authorization token")
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}
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token = string(decodedToken)
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}
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}
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// Must pass at least one other subprotocol so that we can remove the one containing the bearer token,
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// and there is at least one to echo back to the client
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if len(token) > 0 && len(filteredProtocols) == 0 {
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return nil, false, errors.New("missing additional subprotocol")
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}
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if len(token) == 0 {
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return nil, false, nil
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}
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user, ok, err := a.auth.AuthenticateToken(token)
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// on success, remove the protocol with the token
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if ok {
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// https://tools.ietf.org/html/rfc6455#section-11.3.4 indicates the Sec-WebSocket-Protocol header may appear multiple times
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// in a request, and is logically the same as a single Sec-WebSocket-Protocol header field that contains all values
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req.Header.Set(protocolHeader, strings.Join(filteredProtocols, ","))
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}
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// If the token authenticator didn't error, provide a default error
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if !ok && err == nil {
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err = errInvalidToken
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}
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return user, ok, err
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}
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