1/*
2 * libjingle
3 * Copyright 2004--2005, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "talk/xmpp/xmppauth.h"
29
30#include <algorithm>
31
32#include "talk/xmpp/constants.h"
33#include "talk/xmpp/saslcookiemechanism.h"
34#include "talk/xmpp/saslplainmechanism.h"
35
36XmppAuth::XmppAuth() : done_(false) {
37}
38
39XmppAuth::~XmppAuth() {
40}
41
42void XmppAuth::StartPreXmppAuth(const buzz::Jid& jid,
43                                const rtc::SocketAddress& server,
44                                const rtc::CryptString& pass,
45                                const std::string& auth_mechanism,
46                                const std::string& auth_token) {
47  jid_ = jid;
48  passwd_ = pass;
49  auth_mechanism_ = auth_mechanism;
50  auth_token_ = auth_token;
51  done_ = true;
52
53  SignalAuthDone();
54}
55
56static bool contains(const std::vector<std::string>& strings,
57                     const std::string& string) {
58  return std::find(strings.begin(), strings.end(), string) != strings.end();
59}
60
61std::string XmppAuth::ChooseBestSaslMechanism(
62    const std::vector<std::string>& mechanisms,
63    bool encrypted) {
64  // First try Oauth2.
65  if (GetAuthMechanism() == buzz::AUTH_MECHANISM_OAUTH2 &&
66      contains(mechanisms, buzz::AUTH_MECHANISM_OAUTH2)) {
67    return buzz::AUTH_MECHANISM_OAUTH2;
68  }
69
70  // A token is the weakest auth - 15s, service-limited, so prefer it.
71  if (GetAuthMechanism() == buzz::AUTH_MECHANISM_GOOGLE_TOKEN &&
72      contains(mechanisms, buzz::AUTH_MECHANISM_GOOGLE_TOKEN)) {
73    return buzz::AUTH_MECHANISM_GOOGLE_TOKEN;
74  }
75
76  // A cookie is the next weakest - 14 days.
77  if (GetAuthMechanism() == buzz::AUTH_MECHANISM_GOOGLE_COOKIE &&
78      contains(mechanisms, buzz::AUTH_MECHANISM_GOOGLE_COOKIE)) {
79    return buzz::AUTH_MECHANISM_GOOGLE_COOKIE;
80  }
81
82  // As a last resort, use plain authentication.
83  if (contains(mechanisms, buzz::AUTH_MECHANISM_PLAIN)) {
84    return buzz::AUTH_MECHANISM_PLAIN;
85  }
86
87  // No good mechanism found
88  return "";
89}
90
91buzz::SaslMechanism* XmppAuth::CreateSaslMechanism(
92    const std::string& mechanism) {
93  if (mechanism == buzz::AUTH_MECHANISM_OAUTH2) {
94    return new buzz::SaslCookieMechanism(
95        mechanism, jid_.Str(), auth_token_, "oauth2");
96  } else if (mechanism == buzz::AUTH_MECHANISM_GOOGLE_TOKEN) {
97    return new buzz::SaslCookieMechanism(mechanism, jid_.Str(), auth_token_);
98  // } else if (mechanism == buzz::AUTH_MECHANISM_GOOGLE_COOKIE) {
99  //   return new buzz::SaslCookieMechanism(mechanism, jid.Str(), sid_);
100  } else if (mechanism == buzz::AUTH_MECHANISM_PLAIN) {
101    return new buzz::SaslPlainMechanism(jid_, passwd_);
102  } else {
103    return NULL;
104  }
105}
106