2019-10-10 15:37:27 -05:00
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// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyauth
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/caddyserver/caddy/v2"
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)
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func init() {
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caddy.RegisterModule(HTTPBasicAuth{})
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}
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// HTTPBasicAuth facilitates HTTP basic authentication.
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type HTTPBasicAuth struct {
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HashRaw json.RawMessage `json:"hash,omitempty" caddy:"namespace=http.authentication.hashes inline_key=algorithm"`
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AccountList []Account `json:"accounts,omitempty"`
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Realm string `json:"realm,omitempty"`
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Accounts map[string]Account `json:"-"`
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Hash Comparer `json:"-"`
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}
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// CaddyModule returns the Caddy module information.
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func (HTTPBasicAuth) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.authentication.providers.http_basic",
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New: func() caddy.Module { return new(HTTPBasicAuth) },
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}
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}
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// Provision provisions the HTTP basic auth provider.
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func (hba *HTTPBasicAuth) Provision(ctx caddy.Context) error {
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if hba.HashRaw == nil {
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return fmt.Errorf("passwords must be hashed, so a hash must be defined")
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}
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// load password hasher
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hasherIface, err := ctx.LoadModule(hba, "HashRaw")
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if err != nil {
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return fmt.Errorf("loading password hasher module: %v", err)
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}
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hba.Hash = hasherIface.(Comparer)
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if hba.Hash == nil {
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return fmt.Errorf("hash is required")
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}
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// load account list
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hba.Accounts = make(map[string]Account)
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for _, acct := range hba.AccountList {
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if _, ok := hba.Accounts[acct.Username]; ok {
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return fmt.Errorf("username is not unique: %s", acct.Username)
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}
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hba.Accounts[acct.Username] = acct
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}
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hba.AccountList = nil // allow GC to deallocate
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return nil
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}
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// Authenticate validates the user credentials in req and returns the user, if valid.
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func (hba HTTPBasicAuth) Authenticate(w http.ResponseWriter, req *http.Request) (User, bool, error) {
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username, plaintextPasswordStr, ok := req.BasicAuth()
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// if basic auth is missing or invalid, prompt for credentials
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if !ok {
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// browsers show a message that says something like:
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// "The website says: <realm>"
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// which is kinda dumb, but whatever.
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realm := hba.Realm
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if realm == "" {
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realm = "restricted"
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}
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w.Header().Set("WWW-Authenticate", fmt.Sprintf(`Basic realm="%s"`, realm))
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return User{}, false, nil
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}
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plaintextPassword := []byte(plaintextPasswordStr)
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account, accountExists := hba.Accounts[username]
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// don't return early if account does not exist; we want
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// to try to avoid side-channels that leak existence
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same, err := hba.Hash.Compare(account.Password, plaintextPassword, account.Salt)
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if err != nil {
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return User{}, false, err
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}
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if !same || !accountExists {
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return User{}, false, nil
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}
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return User{ID: username}, true, nil
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}
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// Comparer is a type that can securely compare
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// a plaintext password with a hashed password
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// in constant-time. Comparers should hash the
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// plaintext password and then use constant-time
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// comparison.
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type Comparer interface {
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// Compare returns true if the result of hashing
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// plaintextPassword with salt is hashedPassword,
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// false otherwise. An error is returned only if
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// there is a technical/configuration error.
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Compare(hashedPassword, plaintextPassword, salt []byte) (bool, error)
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}
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// Account contains a username, password, and salt (if applicable).
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type Account struct {
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Username string `json:"username"`
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Password []byte `json:"password"`
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Salt []byte `json:"salt,omitempty"` // for algorithms where external salt is needed
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}
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// Interface guards
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var (
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_ caddy.Provisioner = (*HTTPBasicAuth)(nil)
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_ Authenticator = (*HTTPBasicAuth)(nil)
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)
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