104 lines
2.7 KiB
Go
104 lines
2.7 KiB
Go
/*
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Copyright 2020 The KubeSphere 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 token
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import (
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"fmt"
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"time"
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"github.com/dgrijalva/jwt-go"
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"k8s.io/apiserver/pkg/authentication/user"
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"k8s.io/klog"
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)
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const (
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DefaultIssuerName = "kubesphere"
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)
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type Claims struct {
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Username string `json:"username"`
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Groups []string `json:"groups,omitempty"`
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Extra map[string][]string `json:"extra,omitempty"`
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TokenType TokenType `json:"token_type"`
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// Currently, we are not using any field in jwt.StandardClaims
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jwt.StandardClaims
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}
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type jwtTokenIssuer struct {
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name string
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secret []byte
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// Maximum time difference
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maximumClockSkew time.Duration
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}
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func (s *jwtTokenIssuer) Verify(tokenString string) (user.Info, TokenType, error) {
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clm := &Claims{}
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// verify token signature and expiration time
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_, err := jwt.ParseWithClaims(tokenString, clm, s.keyFunc)
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if err != nil {
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klog.V(4).Info(err)
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return nil, "", err
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}
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return &user.DefaultInfo{Name: clm.Username, Groups: clm.Groups, Extra: clm.Extra}, clm.TokenType, nil
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}
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func (s *jwtTokenIssuer) IssueTo(user user.Info, tokenType TokenType, expiresIn time.Duration) (string, error) {
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issueAt := time.Now().Unix() - int64(s.maximumClockSkew.Seconds())
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notBefore := issueAt
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clm := &Claims{
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Username: user.GetName(),
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Groups: user.GetGroups(),
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Extra: user.GetExtra(),
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TokenType: tokenType,
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StandardClaims: jwt.StandardClaims{
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IssuedAt: issueAt,
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Issuer: s.name,
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NotBefore: notBefore,
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},
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}
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if expiresIn > 0 {
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clm.ExpiresAt = clm.IssuedAt + int64(expiresIn.Seconds())
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, clm)
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tokenString, err := token.SignedString(s.secret)
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if err != nil {
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klog.V(4).Info(err)
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return "", err
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}
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return tokenString, nil
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}
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func (s *jwtTokenIssuer) keyFunc(token *jwt.Token) (i interface{}, err error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); ok {
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return s.secret, nil
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} else {
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return nil, fmt.Errorf("expect token signed with HMAC but got %v", token.Header["alg"])
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}
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}
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func NewTokenIssuer(secret string, maximumClockSkew time.Duration) Issuer {
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return &jwtTokenIssuer{
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name: DefaultIssuerName,
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secret: []byte(secret),
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maximumClockSkew: maximumClockSkew,
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}
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}
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