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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "net/base/ssl_config_service.h"
#include "base/registry.h"
namespace net {
static const int kConfigUpdateInterval = 10; // seconds
static const wchar_t kInternetSettingsSubKeyName[] =
L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings";
static const wchar_t kRevocationValueName[] = L"CertificateRevocation";
static const wchar_t kProtocolsValueName[] = L"SecureProtocols";
// In SecureProtocols, each SSL version is represented by a bit:
// SSL 2.0: 0x08
// SSL 3.0: 0x20
// TLS 1.0: 0x80
// The bits are OR'ed to form the DWORD value. So 0xa0 means SSL 3.0 and
// TLS 1.0.
enum {
SSL2 = 0x08,
SSL3 = 0x20,
TLS1 = 0x80
};
// If CertificateRevocation or SecureProtocols is missing, IE uses a default
// value. Unfortunately the default is IE version specific. We use WinHTTP's
// default.
enum {
REVOCATION_DEFAULT = 0,
PROTOCOLS_DEFAULT = SSL3 | TLS1
};
SSLConfigService::SSLConfigService() {
UpdateConfig(TimeTicks::Now());
}
SSLConfigService::SSLConfigService(TimeTicks now) {
UpdateConfig(now);
}
void SSLConfigService::GetSSLConfigAt(SSLConfig* config, TimeTicks now) {
if (now - config_time_ > TimeDelta::FromSeconds(kConfigUpdateInterval))
UpdateConfig(now);
*config = config_info_;
}
// static
bool SSLConfigService::GetSSLConfigNow(SSLConfig* config) {
RegKey internet_settings;
if (!internet_settings.Open(HKEY_CURRENT_USER, kInternetSettingsSubKeyName,
KEY_READ))
return false;
DWORD revocation;
if (!internet_settings.ReadValueDW(kRevocationValueName, &revocation))
revocation = REVOCATION_DEFAULT;
DWORD protocols;
if (!internet_settings.ReadValueDW(kProtocolsValueName, &protocols))
protocols = PROTOCOLS_DEFAULT;
config->rev_checking_enabled = (revocation != 0);
config->ssl2_enabled = ((protocols & SSL2) != 0);
config->ssl3_enabled = ((protocols & SSL3) != 0);
config->tls1_enabled = ((protocols & TLS1) != 0);
return true;
}
// static
void SSLConfigService::SetRevCheckingEnabled(bool enabled) {
DWORD value = enabled;
RegKey internet_settings(HKEY_CURRENT_USER, kInternetSettingsSubKeyName,
KEY_WRITE);
internet_settings.WriteValue(kRevocationValueName, value);
}
// static
void SSLConfigService::SetSSL2Enabled(bool enabled) {
RegKey internet_settings(HKEY_CURRENT_USER, kInternetSettingsSubKeyName,
KEY_READ | KEY_WRITE);
DWORD value;
if (!internet_settings.ReadValueDW(kProtocolsValueName, &value))
value = PROTOCOLS_DEFAULT;
if (enabled)
value |= SSL2;
else
value &= ~SSL2;
internet_settings.WriteValue(kProtocolsValueName, value);
}
void SSLConfigService::UpdateConfig(TimeTicks now) {
GetSSLConfigNow(&config_info_);
config_time_ = now;
}
} // namespace net
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