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// Copyright (C) 2019 LEAP
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package web
import (
"0xacab.org/leap/vpnweb/pkg/auth/creds"
"0xacab.org/leap/vpnweb/pkg/config"
"0xacab.org/leap/vpnweb/pkg/metrics"
"encoding/json"
"github.com/auth0/go-jwt-middleware"
"github.com/dgrijalva/jwt-go"
"log"
"net/http"
"os"
"strings"
"time"
)
const debugAuth string = "VPNWEB_DEBUG_AUTH"
func isDebugAuthEnabled(s string) bool {
if strings.ToLower(s) == "yes" || strings.ToLower(s) == "true" {
return true
}
return false
}
func AuthMiddleware(authenticationFunc func(*creds.Credentials) (bool, error), opts *config.Opts) http.HandlerFunc {
debugFlag, exists := os.LookupEnv(debugAuth)
if !exists {
debugFlag = "false"
}
var authHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var c creds.Credentials
err := json.NewDecoder(r.Body).Decode(&c)
if err != nil {
log.Println("Auth request did not send valid json")
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if c.User == "" || c.Password == "" {
log.Println("Auth request did not include user or password")
http.Error(w, "Missing user and/or password", http.StatusBadRequest)
return
}
valid, err := authenticationFunc(&c)
if !valid {
if err != nil {
metrics.UnavailableLogins.Inc()
log.Println("Error while checking credentials: ", err)
http.Error(w, "503: Auth service unavailable", http.StatusServiceUnavailable)
return
} else {
metrics.FailedLogins.Inc()
if isDebugAuthEnabled(debugFlag) {
log.Println("Wrong credentials for user", c.User)
}
http.Error(w, "401: Wrong user and/or password", http.StatusUnauthorized)
return
}
}
metrics.SuccessfulLogins.Inc()
if isDebugAuthEnabled(debugFlag) {
log.Println("Valid auth for user", c.User)
}
token := jwt.New(jwt.SigningMethodHS256)
claims := token.Claims.(jwt.MapClaims)
claims["expiration"] = time.Now().Add(time.Hour * 24).Unix()
tokenString, _ := token.SignedString([]byte(opts.AuthSecret))
w.Write([]byte(tokenString))
})
return authHandler
}
func RestrictedMiddleware(shouldProtect func() bool, handler func(w http.ResponseWriter, r *http.Request), opts *config.Opts) http.Handler {
jwtMiddleware := jwtmiddleware.New(jwtmiddleware.Options{
ValidationKeyGetter: func(token *jwt.Token) (interface{}, error) {
return []byte(opts.AuthSecret), nil
},
SigningMethod: jwt.SigningMethodHS256,
})
switch shouldProtect() {
case false:
return http.HandlerFunc(handler)
case true:
return jwtMiddleware.Handler(http.HandlerFunc(handler))
}
return nil
}
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