mirror of
https://github.com/cgrates/cgrates.git
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100 lines
3.1 KiB
Go
100 lines
3.1 KiB
Go
/*
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Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
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Copyright (C) ITsysCOM GmbH
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package utils
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import (
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"encoding/base64"
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"fmt"
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"net/http"
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"strings"
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)
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// use provides a cleaner interface for chaining middleware for single routes.
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// Middleware functions are simple HTTP handlers (w http.ResponseWriter, r *http.Request)
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//
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// r.HandleFunc("/login", use(loginHandler, rateLimit, csrf))
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// r.HandleFunc("/form", use(formHandler, csrf))
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// r.HandleFunc("/about", aboutHandler)
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//
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// From https://gist.github.com/elithrar/9146306
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// See https://gist.github.com/elithrar/7600878#comment-955958 for how to extend it to suit simple http.Handler's
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func use(h http.HandlerFunc, middleware ...func(http.HandlerFunc) http.HandlerFunc) http.HandlerFunc {
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for _, m := range middleware {
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h = m(h)
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}
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return h
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}
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type basicAuthMiddleware func(h http.HandlerFunc) http.HandlerFunc
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// basicAuth returns a middleware function to intercept the request and validate
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func basicAuth(userList map[string]string) basicAuthMiddleware {
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return func(h http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
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authHeader := strings.SplitN(r.Header.Get("Authorization"), " ", 2)
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if len(authHeader) != 2 {
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Logger.Warning("<BasicAuth> Missing authorization header value")
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http.Error(w, "Not authorized", 401)
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return
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}
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authHeaderDecoded, err := base64.StdEncoding.DecodeString(authHeader[1])
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if err != nil {
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Logger.Warning("<BasicAuth> Unable to decode authorization header")
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http.Error(w, err.Error(), 401)
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return
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}
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userPass := strings.SplitN(string(authHeaderDecoded), ":", 2)
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if len(userPass) != 2 {
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Logger.Warning("<BasicAuth> Unauthorized API access. Missing or extra credential components")
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http.Error(w, "Not authorized", 401)
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return
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}
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valid := verifyCredential(userPass[0], userPass[1], userList)
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if !valid {
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Logger.Warning(fmt.Sprintf("<BasicAuth> Unauthorized API access by user '%s'", userPass[0]))
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http.Error(w, "Not authorized", 401)
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return
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}
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h.ServeHTTP(w, r)
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}
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}
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}
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// verifyCredential validates the incoming username and password against the authorized user list
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func verifyCredential(username string, password string, userList map[string]string) bool {
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hash, ok := userList[username]
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if !ok {
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return false
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}
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storedPass, err := base64.StdEncoding.DecodeString(hash)
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if err != nil {
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return false
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}
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return string(storedPass[:]) == password
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}
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