mirror of
https://github.com/syncthing/syncthing.git
synced 2024-11-16 10:28:49 -07:00
142 lines
3.5 KiB
Go
142 lines
3.5 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
|
// You can obtain one at https://mozilla.org/MPL/2.0/.
|
|
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/base64"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/syncthing/syncthing/lib/config"
|
|
"github.com/syncthing/syncthing/lib/events"
|
|
"github.com/syncthing/syncthing/lib/rand"
|
|
"github.com/syncthing/syncthing/lib/sync"
|
|
"golang.org/x/crypto/bcrypt"
|
|
)
|
|
|
|
var (
|
|
sessions = make(map[string]bool)
|
|
sessionsMut = sync.NewMutex()
|
|
)
|
|
|
|
func emitLoginAttempt(success bool, username string) {
|
|
events.Default.Log(events.LoginAttempt, map[string]interface{}{
|
|
"success": success,
|
|
"username": username,
|
|
})
|
|
}
|
|
|
|
func basicAuthAndSessionMiddleware(cookieName string, cfg config.GUIConfiguration, next http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
if cfg.IsValidAPIKey(r.Header.Get("X-API-Key")) {
|
|
next.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
cookie, err := r.Cookie(cookieName)
|
|
if err == nil && cookie != nil {
|
|
sessionsMut.Lock()
|
|
_, ok := sessions[cookie.Value]
|
|
sessionsMut.Unlock()
|
|
if ok {
|
|
next.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
}
|
|
|
|
httpl.Debugln("Sessionless HTTP request with authentication; this is expensive.")
|
|
|
|
error := func() {
|
|
time.Sleep(time.Duration(rand.Intn(100)+100) * time.Millisecond)
|
|
w.Header().Set("WWW-Authenticate", "Basic realm=\"Authorization Required\"")
|
|
http.Error(w, "Not Authorized", http.StatusUnauthorized)
|
|
}
|
|
|
|
hdr := r.Header.Get("Authorization")
|
|
if !strings.HasPrefix(hdr, "Basic ") {
|
|
error()
|
|
return
|
|
}
|
|
|
|
hdr = hdr[6:]
|
|
bs, err := base64.StdEncoding.DecodeString(hdr)
|
|
if err != nil {
|
|
error()
|
|
return
|
|
}
|
|
|
|
fields := bytes.SplitN(bs, []byte(":"), 2)
|
|
if len(fields) != 2 {
|
|
error()
|
|
return
|
|
}
|
|
|
|
// Check if the username is correct, assuming it was sent as UTF-8
|
|
username := string(fields[0])
|
|
if username == cfg.User {
|
|
goto usernameOK
|
|
}
|
|
|
|
// ... check it again, converting it from assumed ISO-8859-1 to UTF-8
|
|
username = string(iso88591ToUTF8(fields[0]))
|
|
if username == cfg.User {
|
|
goto usernameOK
|
|
}
|
|
|
|
// Neither of the possible interpretations match the configured username
|
|
emitLoginAttempt(false, username)
|
|
error()
|
|
return
|
|
|
|
usernameOK:
|
|
// Check password as given (assumes UTF-8 encoding)
|
|
password := fields[1]
|
|
if err := bcrypt.CompareHashAndPassword([]byte(cfg.Password), password); err == nil {
|
|
goto passwordOK
|
|
}
|
|
|
|
// ... check it again, converting it from assumed ISO-8859-1 to UTF-8
|
|
password = iso88591ToUTF8(password)
|
|
if err := bcrypt.CompareHashAndPassword([]byte(cfg.Password), password); err == nil {
|
|
goto passwordOK
|
|
}
|
|
|
|
// Neither of the attempts to verify the password checked out
|
|
emitLoginAttempt(false, username)
|
|
error()
|
|
return
|
|
|
|
passwordOK:
|
|
sessionid := rand.String(32)
|
|
sessionsMut.Lock()
|
|
sessions[sessionid] = true
|
|
sessionsMut.Unlock()
|
|
http.SetCookie(w, &http.Cookie{
|
|
Name: cookieName,
|
|
Value: sessionid,
|
|
MaxAge: 0,
|
|
})
|
|
|
|
emitLoginAttempt(true, username)
|
|
next.ServeHTTP(w, r)
|
|
})
|
|
}
|
|
|
|
// Convert an ISO-8859-1 encoded byte string to UTF-8. Works by the
|
|
// principle that ISO-8859-1 bytes are equivalent to unicode code points,
|
|
// that a rune slice is a list of code points, and that stringifying a slice
|
|
// of runes generates UTF-8 in Go.
|
|
func iso88591ToUTF8(s []byte) []byte {
|
|
runes := make([]rune, len(s))
|
|
for i := range s {
|
|
runes[i] = rune(s[i])
|
|
}
|
|
return []byte(string(runes))
|
|
}
|