78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
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/*
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Copyright 2018 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 config
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import (
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"io/ioutil"
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"time"
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)
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var (
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// time.Duration that prevents the client dropping valid credential
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// due to time skew
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expirySkewPreventionDelay = 5 * time.Minute
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)
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// Read authentication from kube-config user section if exists.
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//
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// This function goes through various authentication methods in user
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// section of kube-config and stops if it finds a valid authentication
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// method. The order of authentication methods is:
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//
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// 1. GCP auth-provider
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// 2. token_data
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// 3. token field (point to a token file)
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// 4. username/password
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func (l *KubeConfigLoader) loadAuthentication() {
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// The function walks though authentication methods. It doesn't fail on
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// single method loading failure. It is each loading function's responsiblity
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// to log meaningful failure message. Kubeconfig is allowed to have no user
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// in current context, therefore it is allowed that no authentication is loaded.
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if l.loadGCPToken() || l.loadUserToken() || l.loadUserPassToken() {
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return
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}
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}
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func (l *KubeConfigLoader) loadUserToken() bool {
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if l.user.Token == "" && l.user.TokenFile == "" {
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return false
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}
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// Token takes precedence than TokenFile
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if l.user.Token != "" {
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l.restConfig.token = "Bearer " + l.user.Token
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return true
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}
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// Read TokenFile
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token, err := ioutil.ReadFile(l.user.TokenFile)
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if err != nil {
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// A user may not provide any TokenFile, so we don't log error here
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return false
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}
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l.restConfig.token = "Bearer " + string(token)
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return true
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}
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func (l *KubeConfigLoader) loadUserPassToken() bool {
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if l.user.Username != "" && l.user.Password != "" {
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l.restConfig.token = basicAuthToken(l.user.Username, l.user.Password)
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return true
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}
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return false
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}
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