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basic_auth.go
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// Copyright © 2020 The Things Network Foundation, The Things Industries B.V.
//
// 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 webmiddleware
import (
"crypto/subtle"
"fmt"
"net/http"
"go.thethings.network/lorawan-stack/v3/pkg/webhandlers"
)
// Authenticator is the interface the Basic Auth middleware uses to authenticate users.
type Authenticator interface {
// Authenticate the user with the given password and return true if successful.
// An error may be returned if an internal error occurred.
Authenticate(username, password string) (ok bool, err error)
}
type mapAuthenticator struct {
usernamesPasswords map[string]string
}
func (a *mapAuthenticator) Authenticate(username, password string) (bool, error) {
return subtle.ConstantTimeCompare([]byte(password), []byte(a.usernamesPasswords[username])) == 1, nil
}
// AuthUsers authenticates users with the given map[username]password.
func AuthUsers(usernamesPasswords map[string]string) Authenticator {
return &mapAuthenticator{usernamesPasswords}
}
// AuthUser is the same as AuthUsers, but for a single user.
func AuthUser(username, password string) Authenticator {
return AuthUsers(map[string]string{username: password})
}
var noopAuthenticator = &mapAuthenticator{}
// BasicAuth returns a middleware that authenticates users with Basic Auth.
func BasicAuth(realm string, authenticator Authenticator) MiddlewareFunc {
if authenticator == nil {
authenticator = noopAuthenticator
}
writeUnauthorized := func(w http.ResponseWriter) {
w.Header().Add("WWW-Authenticate", fmt.Sprintf(`Basic realm="%s"`, realm))
w.WriteHeader(http.StatusUnauthorized)
}
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
username, password, ok := r.BasicAuth()
if !ok {
writeUnauthorized(w)
return
}
authenticated, err := authenticator.Authenticate(username, password)
if err != nil {
webhandlers.Error(w, r, err)
return
}
if !authenticated {
writeUnauthorized(w)
return
}
next.ServeHTTP(w, r)
})
}
}