1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "net/base/ssl_config_service_win.h"
6
7 #include "base/registry.h"
8
9 using base::TimeDelta;
10 using base::TimeTicks;
11
12 namespace net {
13
14 static const int kConfigUpdateInterval = 10; // seconds
15
16 static const wchar_t kInternetSettingsSubKeyName[] =
17 L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings";
18
19 static const wchar_t kRevocationValueName[] = L"CertificateRevocation";
20
21 static const wchar_t kProtocolsValueName[] = L"SecureProtocols";
22
23 // In SecureProtocols, each SSL version is represented by a bit:
24 // SSL 2.0: 0x08
25 // SSL 3.0: 0x20
26 // TLS 1.0: 0x80
27 // The bits are OR'ed to form the DWORD value. So 0xa0 means SSL 3.0 and
28 // TLS 1.0.
29 enum {
30 SSL2 = 0x08,
31 SSL3 = 0x20,
32 TLS1 = 0x80
33 };
34
35 // If CertificateRevocation or SecureProtocols is missing, IE uses a default
36 // value. Unfortunately the default is IE version specific. We use WinHTTP's
37 // default.
38 enum {
39 REVOCATION_DEFAULT = 0,
40 PROTOCOLS_DEFAULT = SSL3 | TLS1
41 };
42
SSLConfigServiceWin()43 SSLConfigServiceWin::SSLConfigServiceWin() : ever_updated_(false) {
44 // We defer retrieving the settings until the first call to GetSSLConfig, to
45 // avoid an expensive call on the UI thread, which could affect startup time.
46 }
47
SSLConfigServiceWin(TimeTicks now)48 SSLConfigServiceWin::SSLConfigServiceWin(TimeTicks now) : ever_updated_(false) {
49 UpdateConfig(now);
50 }
51
GetSSLConfigAt(SSLConfig * config,TimeTicks now)52 void SSLConfigServiceWin::GetSSLConfigAt(SSLConfig* config, TimeTicks now) {
53 if (!ever_updated_ ||
54 now - config_time_ > TimeDelta::FromSeconds(kConfigUpdateInterval))
55 UpdateConfig(now);
56 *config = config_info_;
57 }
58
59 // static
GetSSLConfigNow(SSLConfig * config)60 bool SSLConfigServiceWin::GetSSLConfigNow(SSLConfig* config) {
61 RegKey internet_settings;
62 if (!internet_settings.Open(HKEY_CURRENT_USER, kInternetSettingsSubKeyName,
63 KEY_READ))
64 return false;
65
66 DWORD revocation;
67 if (!internet_settings.ReadValueDW(kRevocationValueName, &revocation))
68 revocation = REVOCATION_DEFAULT;
69
70 DWORD protocols;
71 if (!internet_settings.ReadValueDW(kProtocolsValueName, &protocols))
72 protocols = PROTOCOLS_DEFAULT;
73
74 config->rev_checking_enabled = (revocation != 0);
75 config->ssl2_enabled = ((protocols & SSL2) != 0);
76 config->ssl3_enabled = ((protocols & SSL3) != 0);
77 config->tls1_enabled = ((protocols & TLS1) != 0);
78
79 return true;
80 }
81
82 // static
SetRevCheckingEnabled(bool enabled)83 void SSLConfigServiceWin::SetRevCheckingEnabled(bool enabled) {
84 DWORD value = enabled;
85 RegKey internet_settings(HKEY_CURRENT_USER, kInternetSettingsSubKeyName,
86 KEY_WRITE);
87 internet_settings.WriteValue(kRevocationValueName, value);
88 // TODO(mattm): We should call UpdateConfig after updating settings, but these
89 // methods are static.
90 }
91
92 // static
SetSSL2Enabled(bool enabled)93 void SSLConfigServiceWin::SetSSL2Enabled(bool enabled) {
94 RegKey internet_settings(HKEY_CURRENT_USER, kInternetSettingsSubKeyName,
95 KEY_READ | KEY_WRITE);
96 DWORD value;
97 if (!internet_settings.ReadValueDW(kProtocolsValueName, &value))
98 value = PROTOCOLS_DEFAULT;
99 if (enabled)
100 value |= SSL2;
101 else
102 value &= ~SSL2;
103 internet_settings.WriteValue(kProtocolsValueName, value);
104 // TODO(mattm): We should call UpdateConfig after updating settings, but these
105 // methods are static.
106 }
107
UpdateConfig(TimeTicks now)108 void SSLConfigServiceWin::UpdateConfig(TimeTicks now) {
109 GetSSLConfigNow(&config_info_);
110 config_time_ = now;
111 ever_updated_ = true;
112 }
113
114 } // namespace net
115