173 lines
3.6 KiB
Go
173 lines
3.6 KiB
Go
/*
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Copyright 2019 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 authenticate
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import (
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"errors"
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"github.com/dgrijalva/jwt-go"
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"github.com/mholt/caddy/caddyhttp/httpserver"
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)
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type Auth struct {
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Rule Rule
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Next httpserver.Handler
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}
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type Rule struct {
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Secret []byte
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Path string
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ExceptedPath []string
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}
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type User struct {
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Username string `json:"username"`
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UID string `json:"uid"`
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Groups *[]string `json:"groups,omitempty"`
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Extra *map[string]interface{} `json:"extra,omitempty"`
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}
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func (h Auth) ServeHTTP(resp http.ResponseWriter, req *http.Request) (int, error) {
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for _, path := range h.Rule.ExceptedPath {
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if httpserver.Path(req.URL.Path).Matches(path) {
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return h.Next.ServeHTTP(resp, req)
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}
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}
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if httpserver.Path(req.URL.Path).Matches(h.Rule.Path) {
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uToken, err := h.ExtractToken(req)
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if err != nil {
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return h.HandleUnauthorized(resp, err), nil
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}
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token, err := h.Validate(uToken)
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if err != nil {
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return h.HandleUnauthorized(resp, err), nil
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}
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req, err = h.InjectContext(req, token)
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if err != nil {
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return h.HandleUnauthorized(resp, err), nil
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}
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}
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return h.Next.ServeHTTP(resp, req)
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}
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func (h Auth) InjectContext(req *http.Request, token *jwt.Token) (*http.Request, error) {
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payLoad, ok := token.Claims.(jwt.MapClaims)
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if !ok {
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return nil, errors.New("invalid payload")
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}
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for header := range req.Header {
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if strings.HasPrefix(header, "X-Token-") {
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req.Header.Del(header)
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}
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}
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username, ok := payLoad["username"].(string)
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if ok && username != "" {
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req.Header.Set("X-Token-Username", username)
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}
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uid := payLoad["uid"]
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if uid != nil {
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switch uid.(type) {
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case int:
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req.Header.Set("X-Token-UID", strconv.Itoa(uid.(int)))
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break
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case string:
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req.Header.Set("X-Token-UID", uid.(string))
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break
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}
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}
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groups, ok := payLoad["groups"].([]string)
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if ok && len(groups) > 0 {
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req.Header.Set("X-Token-Groups", strings.Join(groups, ","))
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}
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return req, nil
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}
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func (h Auth) Validate(uToken string) (*jwt.Token, error) {
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if len(uToken) == 0 {
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return nil, fmt.Errorf("token length is zero")
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}
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token, err := jwt.Parse(uToken, h.ProvideKey)
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if err != nil {
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return nil, err
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}
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return token, nil
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}
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func (h Auth) HandleUnauthorized(w http.ResponseWriter, err error) int {
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message := fmt.Sprintf("Unauthorized,%v", err)
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w.Header().Add("WWW-Authenticate", message)
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return http.StatusUnauthorized
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}
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func (h Auth) ExtractToken(r *http.Request) (string, error) {
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jwtHeader := strings.Split(r.Header.Get("Authorization"), " ")
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if jwtHeader[0] == "Bearer" && len(jwtHeader) == 2 {
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return jwtHeader[1], nil
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}
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jwtCookie, err := r.Cookie("token")
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if err == nil {
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return jwtCookie.Value, nil
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}
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jwtQuery := r.URL.Query().Get("token")
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if jwtQuery != "" {
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return jwtQuery, nil
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}
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return "", fmt.Errorf("no token found")
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}
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func (h Auth) ProvideKey(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); ok {
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return h.Rule.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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