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handlers.go
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handlers.go
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/*
Copyright 2015 All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"bytes"
"encoding/base64"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"path"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/coreos/go-oidc/oauth2"
"github.com/gin-gonic/gin"
)
//
// oauthAuthorizationHandler is responsible for performing the redirection to oauth provider
//
func (r *oauthProxy) oauthAuthorizationHandler(cx *gin.Context) {
// step: we can skip all of this if were not verifying the token
if r.config.SkipTokenVerification {
cx.AbortWithStatus(http.StatusNotAcceptable)
return
}
client, err := r.client.OAuthClient()
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("failed to retrieve the oauth client for authorization")
cx.AbortWithStatus(http.StatusInternalServerError)
return
}
// step: set the access type of the session
accessType := ""
if containedIn("offline", r.config.Scopes) {
accessType = "offline"
}
// step: generate the authorization url
redirectionURL := client.AuthCodeURL(cx.Query("state"), accessType, "")
log.WithFields(log.Fields{
"client_ip": cx.ClientIP(),
"access_type": accessType,
"redirection-url": redirectionURL,
}).Debugf("incoming authorization request from client address: %s", cx.ClientIP())
// step: if we have a custom sign in page, lets display that
if r.config.hasCustomSignInPage() {
// step: inject any custom tags into the context for the template
model := make(map[string]string, 0)
for k, v := range r.config.TagData {
model[k] = v
}
model["redirect"] = redirectionURL
cx.HTML(http.StatusOK, path.Base(r.config.SignInPage), model)
return
}
r.redirectToURL(redirectionURL, cx)
}
//
// oauthCallbackHandler is responsible for handling the response from oauth service
//
func (r *oauthProxy) oauthCallbackHandler(cx *gin.Context) {
// step: is token verification switched on?
if r.config.SkipTokenVerification {
cx.AbortWithStatus(http.StatusNotAcceptable)
return
}
// step: ensure we have a authorization code to exchange
code := cx.Request.URL.Query().Get("code")
if code == "" {
cx.AbortWithStatus(http.StatusBadRequest)
return
}
// step: exchange the authorization for a access token
response, err := exchangeAuthenticationCode(r.client, code)
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to exchange code for access token")
r.accessForbidden(cx)
return
}
// step: parse decode the identity token
session, identity, err := parseToken(response.IDToken)
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to parse id token for identity")
r.accessForbidden(cx)
return
}
// step: verify the token is valid
if err = verifyToken(r.client, session); err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to verify the id token")
r.accessForbidden(cx)
return
}
// step: attempt to decode the access token else we default to the id token
accessToken, id, err := parseToken(response.AccessToken)
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to parse the access token, using id token only")
} else {
session = accessToken
identity = id
}
log.WithFields(log.Fields{
"email": identity.Email,
"expires": identity.ExpiresAt.Format(time.RFC3339),
"duration": identity.ExpiresAt.Sub(time.Now()).String(),
}).Infof("issuing a new access token for user, email: %s", identity.Email)
// step: drop's a session cookie with the access token
duration := identity.ExpiresAt.Sub(time.Now())
r.dropAccessTokenCookie(cx, session.Encode(), duration)
// step: does the response has a refresh token and we are NOT ignore refresh tokens?
if r.config.EnableRefreshTokens && response.RefreshToken != "" {
// step: encrypt the refresh token
encrypted, err := encodeText(response.RefreshToken, r.config.EncryptionKey)
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("failed to encrypt the refresh token")
cx.AbortWithStatus(http.StatusInternalServerError)
return
}
// step: create and inject the state session
switch r.useStore() {
case true:
if err := r.StoreRefreshToken(session, encrypted); err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Warnf("failed to save the refresh token in the store")
}
default:
//
// step: attempt to decode the refresh token (not all refresh tokens are jwt tokens;
// gooogle for instance.
//
if _, ident, err := parseToken(response.RefreshToken); err != nil {
r.dropRefreshTokenCookie(cx, encrypted, time.Duration(72)*time.Hour)
} else {
r.dropRefreshTokenCookie(cx, encrypted, ident.ExpiresAt.Sub(time.Now()))
}
}
}
// step: decode the state variable
state := "/"
if cx.Request.URL.Query().Get("state") != "" {
decoded, err := base64.StdEncoding.DecodeString(cx.Request.URL.Query().Get("state"))
if err != nil {
log.WithFields(log.Fields{
"state": cx.Request.URL.Query().Get("state"),
"error": err.Error(),
}).Warnf("unable to decode the state parameter")
} else {
state = string(decoded)
}
}
r.redirectToURL(state, cx)
}
//
// loginHandler provide's a generic endpoint for clients to perform a user_credentials login to the provider
//
func (r *oauthProxy) loginHandler(cx *gin.Context) {
errorMsg, code, err := func() (string, int, error) {
// step: parse the client credentials
username := cx.Request.PostFormValue("username")
password := cx.Request.PostFormValue("password")
if username == "" || password == "" {
return "request does not have both username and password", http.StatusBadRequest, errors.New("no credentials")
}
// step: get the client
client, err := r.client.OAuthClient()
if err != nil {
return "unable to create the oauth client for user_credentials request", http.StatusInternalServerError, err
}
token, err := client.UserCredsToken(username, password)
if err != nil {
if strings.HasPrefix(err.Error(), oauth2.ErrorInvalidGrant) {
return "invalid user credentials provided", http.StatusUnauthorized, err
}
return "unable to request the access token via grant_type 'password'", http.StatusInternalServerError, err
}
// step: parse the token
_, identity, err := parseToken(token.AccessToken)
if err != nil {
return "unable to decode the access token", http.StatusNotImplemented, err
}
r.dropAccessTokenCookie(cx, token.AccessToken, identity.ExpiresAt.Sub(time.Now()))
cx.JSON(http.StatusOK, tokenResponse{
IDToken: token.IDToken,
AccessToken: token.AccessToken,
RefreshToken: token.RefreshToken,
ExpiresIn: token.Expires,
Scope: token.Scope,
})
return "", http.StatusOK, nil
}()
if err != nil {
log.WithFields(log.Fields{
"client_ip": cx.Request.RemoteAddr,
"error": err.Error,
}).Errorf(errorMsg)
cx.AbortWithStatus(code)
}
}
//
// logoutHandler performs a logout
// - if it's just a access token, the cookie is deleted
// - if the user has a refresh token, the token is invalidated by the provider
// - optionally, the user can be redirected by to a url
//
func (r *oauthProxy) logoutHandler(cx *gin.Context) {
// the user can specify a url to redirect the back to
redirectURL := cx.Request.URL.Query().Get("redirect")
// step: drop the access token
user, err := r.getIdentity(cx)
if err != nil {
cx.AbortWithStatus(http.StatusBadRequest)
return
}
// step: can either use the id token or the refresh token
identityToken := user.token.Encode()
if refresh, err := r.retrieveRefreshToken(cx, user); err == nil {
identityToken = refresh
}
r.clearAllCookies(cx)
// step: check if the user has a state session and if so, revoke it
if r.useStore() {
go func() {
if err := r.DeleteRefreshToken(user.token); err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to remove the refresh token from store")
}
}()
}
// step: do we have a revocation endpoint?
if r.config.RevocationEndpoint != "" {
client, err := r.client.OAuthClient()
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to retrieve the openid client")
cx.AbortWithStatus(http.StatusInternalServerError)
return
}
// step: add the authentication headers
// @TODO need to add the authenticated request to go-oidc
encodedID := url.QueryEscape(r.config.ClientID)
encodedSecret := url.QueryEscape(r.config.ClientSecret)
// step: construct the url for revocation
request, err := http.NewRequest("POST", r.config.RevocationEndpoint,
bytes.NewBufferString(fmt.Sprintf("refresh_token=%s", identityToken)))
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to construct the revocation request")
cx.AbortWithStatus(http.StatusInternalServerError)
return
}
// step: add the authentication headers and content-type
request.SetBasicAuth(encodedID, encodedSecret)
request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
// step: attempt to make the
response, err := client.HttpClient().Do(request)
if err != nil {
log.WithFields(log.Fields{
"error": err.Error(),
}).Errorf("unable to post to revocation endpoint")
return
}
// step: add a log for debugging
switch response.StatusCode {
case http.StatusNoContent:
log.WithFields(log.Fields{
"user": user.email,
}).Infof("successfully logged out of the endpoint")
default:
content, _ := ioutil.ReadAll(response.Body)
log.WithFields(log.Fields{
"status": response.StatusCode,
"response": fmt.Sprintf("%s", content),
}).Errorf("invalid response from revocation endpoint")
}
}
// step: should we redirect the user
if redirectURL != "" {
r.redirectToURL(redirectURL, cx)
return
}
cx.AbortWithStatus(http.StatusOK)
}
//
// expirationHandler checks if the token has expired
//
func (r *oauthProxy) expirationHandler(cx *gin.Context) {
// step: get the access token from the request
user, err := r.getIdentity(cx)
if err != nil {
cx.AbortWithError(http.StatusUnauthorized, err)
return
}
// step: check the access is not expired
if user.isExpired() {
cx.AbortWithError(http.StatusUnauthorized, err)
return
}
cx.AbortWithStatus(http.StatusOK)
}
//
// tokenHandler display access token to screen
//
func (r *oauthProxy) tokenHandler(cx *gin.Context) {
// step: extract the access token from the request
user, err := r.getIdentity(cx)
if err != nil {
cx.AbortWithError(http.StatusBadRequest, fmt.Errorf("unable to retrieve session, error: %s", err))
return
}
// step: write the json content
cx.Writer.Header().Set("Content-Type", "application/json")
cx.String(http.StatusOK, fmt.Sprintf("%s", user.token.Payload))
}
//
// healthHandler is a health check handler for the service
//
func (r *oauthProxy) healthHandler(cx *gin.Context) {
cx.Writer.Header().Set(versionHeader, version)
cx.String(http.StatusOK, "OK\n")
}
//
// metricsHandler forwards the request into the prometheus handler
//
func (r *oauthProxy) metricsHandler(cx *gin.Context) {
if r.config.LocalhostMetrics {
if !net.ParseIP(cx.ClientIP()).IsLoopback() {
r.accessForbidden(cx)
return
}
}
r.prometheusHandler.ServeHTTP(cx.Writer, cx.Request)
}
//
// retrieveRefreshToken retrieves the refresh token from store or cookie
//
func (r *oauthProxy) retrieveRefreshToken(cx *gin.Context, user *userContext) (string, error) {
var token string
var err error
// step: get the refresh token from the store or cookie
switch r.useStore() {
case true:
token, err = r.GetRefreshToken(user.token)
default:
token, err = r.getRefreshTokenFromCookie(cx)
}
// step: decode the cookie
if err != nil {
return token, err
}
return decodeText(token, r.config.EncryptionKey)
}