93 lines
2.8 KiB
Go
93 lines
2.8 KiB
Go
// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
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// Use of this source code is governed by a MIT style
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// license that can be found in the LICENSE file.
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package gin
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import (
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"crypto/subtle"
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"encoding/base64"
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"strconv"
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)
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const AuthUserKey = "user"
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type (
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Accounts map[string]string
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authPair struct {
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Value string
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User string
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}
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authPairs []authPair
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)
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func (a authPairs) searchCredential(authValue string) (string, bool) {
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if len(authValue) == 0 {
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return "", false
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}
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for _, pair := range a {
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if pair.Value == authValue {
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return pair.User, true
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}
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}
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return "", false
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}
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// BasicAuthForRealm returns a Basic HTTP Authorization middleware. It takes as arguments a map[string]string where
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// the key is the user name and the value is the password, as well as the name of the Realm.
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// If the realm is empty, "Authorization Required" will be used by default.
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// (see http://tools.ietf.org/html/rfc2617#section-1.2)
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func BasicAuthForRealm(accounts Accounts, realm string) HandlerFunc {
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if realm == "" {
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realm = "Authorization Required"
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}
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realm = "Basic realm=" + strconv.Quote(realm)
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pairs := processAccounts(accounts)
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return func(c *Context) {
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// Search user in the slice of allowed credentials
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user, found := pairs.searchCredential(c.Request.Header.Get("Authorization"))
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if !found {
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// Credentials doesn't match, we return 401 and abort handlers chain.
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c.Header("WWW-Authenticate", realm)
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c.AbortWithStatus(401)
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} else {
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// The user credentials was found, set user's id to key AuthUserKey in this context, the userId can be read later using
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// c.MustGet(gin.AuthUserKey)
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c.Set(AuthUserKey, user)
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}
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}
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}
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// BasicAuth returns a Basic HTTP Authorization middleware. It takes as argument a map[string]string where
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// the key is the user name and the value is the password.
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func BasicAuth(accounts Accounts) HandlerFunc {
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return BasicAuthForRealm(accounts, "")
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}
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func processAccounts(accounts Accounts) authPairs {
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assert1(len(accounts) > 0, "Empty list of authorized credentials")
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pairs := make(authPairs, 0, len(accounts))
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for user, password := range accounts {
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assert1(len(user) > 0, "User can not be empty")
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value := authorizationHeader(user, password)
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pairs = append(pairs, authPair{
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Value: value,
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User: user,
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})
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}
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return pairs
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}
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func authorizationHeader(user, password string) string {
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base := user + ":" + password
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return "Basic " + base64.StdEncoding.EncodeToString([]byte(base))
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}
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func secureCompare(given, actual string) bool {
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if subtle.ConstantTimeEq(int32(len(given)), int32(len(actual))) == 1 {
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return subtle.ConstantTimeCompare([]byte(given), []byte(actual)) == 1
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}
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/* Securely compare actual to itself to keep constant time, but always return false */
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return subtle.ConstantTimeCompare([]byte(actual), []byte(actual)) == 1 && false
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}
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