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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/crypto_module_password_dialog.h"
#include <pk11pub.h>
#include "base/bind.h"
#include "base/logging.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/crypto_module.h"
#include "net/base/x509_certificate.h"
#if defined(OS_CHROMEOS)
#include "crypto/nss_util.h"
#endif
using content::BrowserThread;
namespace {
bool ShouldShowDialog(const net::CryptoModule* module) {
// The wincx arg is unused since we don't call PK11_SetIsLoggedInFunc.
return (PK11_NeedLogin(module->os_module_handle()) &&
!PK11_IsLoggedIn(module->os_module_handle(), NULL /* wincx */));
}
// Basically an asynchronous implementation of NSS's PK11_DoPassword.
// Note: This currently handles only the simple case. See the TODOs in
// GotPassword for what is yet unimplemented.
class SlotUnlocker {
public:
SlotUnlocker(const net::CryptoModuleList& modules,
chrome::CryptoModulePasswordReason reason,
const std::string& host,
const base::Closure& callback);
void Start();
private:
void GotPassword(const char* password);
void Done();
size_t current_;
net::CryptoModuleList modules_;
chrome::CryptoModulePasswordReason reason_;
std::string host_;
base::Closure callback_;
PRBool retry_;
};
SlotUnlocker::SlotUnlocker(const net::CryptoModuleList& modules,
chrome::CryptoModulePasswordReason reason,
const std::string& host,
const base::Closure& callback)
: current_(0),
modules_(modules),
reason_(reason),
host_(host),
callback_(callback),
retry_(PR_FALSE) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}
void SlotUnlocker::Start() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
for (; current_ < modules_.size(); ++current_) {
if (ShouldShowDialog(modules_[current_].get())) {
#if defined(OS_CHROMEOS)
if (crypto::IsTPMTokenReady()) {
std::string token_name;
std::string user_pin;
crypto::GetTPMTokenInfo(&token_name, &user_pin);
if (modules_[current_]->GetTokenName() == token_name) {
// The user PIN is a well known secret on this machine, and
// the user didn't set it, so we need to fetch the value and
// supply it for them here.
GotPassword(user_pin.c_str());
return;
}
}
#endif
ShowCryptoModulePasswordDialog(
modules_[current_]->GetTokenName(),
retry_,
reason_,
host_,
base::Bind(&SlotUnlocker::GotPassword, base::Unretained(this)));
return;
}
}
Done();
}
void SlotUnlocker::GotPassword(const char* password) {
// TODO(mattm): PK11_DoPassword has something about PK11_Global.verifyPass.
// Do we need it?
// http://mxr.mozilla.org/mozilla/source/security/nss/lib/pk11wrap/pk11auth.c#577
if (!password) {
// User cancelled entering password. Oh well.
++current_;
Start();
return;
}
// TODO(mattm): handle protectedAuthPath
SECStatus rv = PK11_CheckUserPassword(modules_[current_]->os_module_handle(),
password);
if (rv == SECWouldBlock) {
// Incorrect password. Try again.
retry_ = PR_TRUE;
Start();
return;
}
// TODO(mattm): PK11_DoPassword calls nssTrustDomain_UpdateCachedTokenCerts on
// non-friendly slots. How important is that?
// Correct password (SECSuccess) or too many attempts/other failure
// (SECFailure). Either way we're done with this slot.
++current_;
Start();
}
void SlotUnlocker::Done() {
DCHECK_EQ(current_, modules_.size());
callback_.Run();
delete this;
}
} // namespace
namespace chrome {
void UnlockSlotsIfNecessary(const net::CryptoModuleList& modules,
chrome::CryptoModulePasswordReason reason,
const std::string& host,
const base::Closure& callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
for (size_t i = 0; i < modules.size(); ++i) {
if (ShouldShowDialog(modules[i].get())) {
(new SlotUnlocker(modules, reason, host, callback))->Start();
return;
}
}
callback.Run();
}
void UnlockCertSlotIfNecessary(net::X509Certificate* cert,
chrome::CryptoModulePasswordReason reason,
const std::string& host,
const base::Closure& callback) {
net::CryptoModuleList modules;
modules.push_back(net::CryptoModule::CreateFromHandle(
cert->os_cert_handle()->slot));
UnlockSlotsIfNecessary(modules, reason, host, callback);
}
} // namespace chrome
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