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mfa.go
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/
mfa.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
import (
"net/http"
"github.com/google/exposure-notifications-verification-server/internal/auth"
"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"
)
// RequireMFA checks the realm's MFA requirements and enforces them.
// Use requireRealm before requireMFA to ensure the currently selected realm is on context.
// If no realm is selected, this assumes MFA is required.
func RequireMFA(authProvider auth.Provider, 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()
session := controller.SessionFromContext(ctx)
if session == nil {
controller.MissingSession(w, r, h)
return
}
membership := controller.MembershipFromContext(ctx)
if membership == nil {
controller.MissingMembership(w, r, h)
return
}
currentRealm := membership.Realm
mfaEnabled, err := authProvider.MFAEnabled(ctx, session)
if err != nil {
controller.InternalError(w, r, h, err)
return
}
prompted := controller.MFAPromptedFromSession(session)
if !mfaEnabled {
if mode := currentRealm.EffectiveMFAMode(membership.CreatedAt); mode == database.MFARequired ||
mode == database.MFAOptionalPrompt && !prompted {
controller.RedirectToMFA(w, r, h)
return
}
}
// Store prompted check, so we don't check again.
controller.StoreSessionMFAPrompted(session, true)
next.ServeHTTP(w, r)
})
}
}