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/
auth.go
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/
auth.go
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// Copyright 2020 Google LLC
//
// 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 middleware defines shared middleware for handlers.
package middleware
import (
"net/http"
"time"
"github.com/google/exposure-notifications-server/pkg/logging"
"github.com/google/exposure-notifications-verification-server/internal/auth"
"github.com/google/exposure-notifications-verification-server/pkg/cache"
"github.com/google/exposure-notifications-verification-server/pkg/controller"
"github.com/google/exposure-notifications-verification-server/pkg/database"
"github.com/google/exposure-notifications-verification-server/pkg/render"
"github.com/gorilla/mux"
)
// RequireAuth requires a user to be logged in. It also fetches and stores
// information about the user on the request context.
func RequireAuth(cacher cache.Cacher, authProvider auth.Provider, db *database.Database, h render.Renderer, sessionIdleTTL, expiryCheckTTL time.Duration) mux.MiddlewareFunc {
cacheTTL := 30 * time.Minute
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
logger := logging.FromContext(ctx).Named("middleware.RequireAuth")
session := controller.SessionFromContext(ctx)
if session == nil {
logger.Errorw("session does not exist")
controller.MissingSession(w, r, h)
return
}
flash := controller.Flash(session)
// Check session idle timeout.
if t := controller.LastActivityFromSession(session); !t.IsZero() {
// If it's been more than the TTL since we've seen this session,
// expire it by creating a new empty session.
if time.Since(t) > sessionIdleTTL {
flash.Error("Your session has expired due to inactivity.")
controller.RedirectToLogout(w, r, h)
return
}
}
// Get the email from the auth provider.
email, err := authProvider.EmailAddress(ctx, session)
if err != nil {
logger.Debugw("failed to get email from session", "error", err)
flash.Error("An error occurred trying to verify your credentials.")
controller.RedirectToLogout(w, r, h)
return
}
// Load the user by using the cache to alleviate pressure on the database
// layer.
var user database.User
userCacheKey := &cache.Key{
Namespace: "users:by_email",
Key: email,
}
if err := cacher.Fetch(ctx, userCacheKey, &user, cacheTTL, func() (interface{}, error) {
return db.FindUserByEmail(email)
}); err != nil {
authProvider.ClearSession(ctx, session)
if database.IsNotFound(err) {
controller.Unauthorized(w, r, h)
return
}
logger.Errorw("failed to lookup user", "error", err)
controller.InternalError(w, r, h, err)
return
}
// Check if the session is still valid.
if time.Now().After(user.LastRevokeCheck.Add(expiryCheckTTL)) {
// Check if the session has been revoked.
if err := authProvider.CheckRevoked(ctx, session); err != nil {
logger.Debugw("session revoked", "error", err)
flash.Error("You have been logged out from another session.")
controller.RedirectToLogout(w, r, h)
return
}
// Update the revoke check time.
if err := db.TouchUserRevokeCheck(&user); err != nil {
logger.Errorw("failed to update revocation check time", "error", err)
controller.InternalError(w, r, h, err)
return
}
// Update the user in the cache so it has the new revoke check time.
if err := cacher.Write(ctx, userCacheKey, &user, cacheTTL); err != nil {
logger.Errorw("failed to cache user revocation check time", "error", err)
controller.InternalError(w, r, h, err)
return
}
}
// Look up the user's memberships.
memberships, err := user.ListMemberships(db)
if err != nil {
controller.InternalError(w, r, h, err)
return
}
// Save the user on the context.
ctx = controller.WithUser(ctx, &user)
ctx = controller.WithMemberships(ctx, memberships)
r = r.Clone(ctx)
next.ServeHTTP(w, r)
})
}
}
// RequireSystemAdmin requires the current user is a global administrator. It must
// come after RequireAuth so that a user is set on the context.
func RequireSystemAdmin(h render.Renderer) mux.MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
logger := logging.FromContext(ctx).Named("middleware.RequireAdminHandler")
currentUser := controller.UserFromContext(ctx)
if currentUser == nil {
controller.MissingUser(w, r, h)
return
}
if !currentUser.SystemAdmin {
logger.Debugw("user is not an admin")
controller.Unauthorized(w, r, h)
return
}
next.ServeHTTP(w, r)
})
}
}