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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/certificate_dialogs.h"
#include <stddef.h>
#include <algorithm>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/base64.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/task/thread_pool.h"
#include "chrome/browser/download/download_prefs.h"
#include "chrome/browser/ui/chrome_select_file_policy.h"
#include "chrome/grit/generated_resources.h"
#include "content/public/browser/web_contents.h"
#include "net/base/filename_util.h"
#include "net/cert/x509_util.h"
#include "third_party/boringssl/src/include/openssl/bytestring.h"
#include "third_party/boringssl/src/include/openssl/pkcs7.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/shell_dialogs/select_file_dialog.h"
#include "ui/shell_dialogs/selected_file_info.h"
#include "url/gurl.h"
namespace {
enum CertFileType {
kBase64 = 0,
kBase64Chain = 1,
kDer = 2,
kPkcs7 = 3,
kPkcs7Chain = 4,
kNumCertFileTypes = 5,
};
void WriterCallback(const base::FilePath& path, const std::string& data) {
if (!base::WriteFile(path, data)) {
LOG(ERROR) << "Error writing " << path.value() << " (" << data.size()
<< "B)";
}
}
std::string WrapAt64(const std::string& str) {
std::string result;
for (size_t i = 0; i < str.size(); i += 64) {
result.append(str, i, 64); // Append clamps the len arg internally.
result.append("\r\n");
}
return result;
}
std::string GetBase64String(const CRYPTO_BUFFER* cert) {
std::string base64 =
base::Base64Encode(net::x509_util::CryptoBufferAsSpan(cert));
return "-----BEGIN CERTIFICATE-----\r\n" + WrapAt64(base64) +
"-----END CERTIFICATE-----\r\n";
}
////////////////////////////////////////////////////////////////////////////////
// General utility functions.
void ShowCertSelectFileDialogFullExport(
ui::SelectFileDialog* select_file_dialog,
const base::FilePath& suggested_path,
gfx::NativeWindow parent) {
ui::SelectFileDialog::FileTypeInfo file_type_info;
file_type_info.extensions = {
{FILE_PATH_LITERAL("pem"), FILE_PATH_LITERAL("crt")}};
file_type_info.extension_description_overrides.push_back(
l10n_util::GetStringUTF16(IDS_CERT_EXPORT_TYPE_BASE64_ALL));
file_type_info.include_all_files = true;
select_file_dialog->SelectFile(
ui::SelectFileDialog::SELECT_SAVEAS_FILE, std::u16string(),
suggested_path, &file_type_info,
1, // 1-based index for |file_type_info.extensions| to specify default.
FILE_PATH_LITERAL("crt"), parent);
}
class Exporter : public ui::SelectFileDialog::Listener {
public:
Exporter(content::WebContents* web_contents,
gfx::NativeWindow parent,
std::vector<bssl::UniquePtr<CRYPTO_BUFFER>> cert_chain,
const std::string& suggested_file_name,
bool full_export);
Exporter(const Exporter&) = delete;
Exporter& operator=(const Exporter&) = delete;
// SelectFileDialog::Listener implementation.
void FileSelected(const ui::SelectedFileInfo& file, int index) override;
void FileSelectionCanceled() override;
private:
~Exporter() override;
std::string GetCMSString(size_t start, size_t end) const;
scoped_refptr<ui::SelectFileDialog> const select_file_dialog_;
// The certificate hierarchy (leaf cert first).
std::vector<bssl::UniquePtr<CRYPTO_BUFFER>> cert_chain_list_;
const bool full_export_;
};
Exporter::Exporter(content::WebContents* web_contents,
gfx::NativeWindow parent,
std::vector<bssl::UniquePtr<CRYPTO_BUFFER>> cert_chain,
const std::string& suggested_file_name,
bool full_export)
: select_file_dialog_(ui::SelectFileDialog::Create(
this,
std::make_unique<ChromeSelectFilePolicy>(web_contents))),
cert_chain_list_(std::move(cert_chain)),
full_export_(full_export) {
base::FilePath suggested_name =
net::GenerateFileName(GURL(), // url
std::string(), // content_disposition
std::string(), // referrer_charset
suggested_file_name, // suggested_name
std::string(), // mime_type
"certificate"); // default_name
DownloadPrefs* download_prefs =
DownloadPrefs::FromBrowserContext(web_contents->GetBrowserContext());
base::FilePath suggested_path =
download_prefs->SaveFilePath().Append(suggested_name);
if (full_export_) {
ShowCertSelectFileDialogFullExport(select_file_dialog_.get(),
suggested_path, parent);
} else {
ShowCertSelectFileDialog(select_file_dialog_.get(),
ui::SelectFileDialog::SELECT_SAVEAS_FILE,
suggested_path, parent);
}
}
Exporter::~Exporter() {
// There may be pending file dialogs, we need to tell them that we've gone
// away so they don't try and call back to us.
if (select_file_dialog_) {
select_file_dialog_->ListenerDestroyed();
}
}
void Exporter::FileSelected(const ui::SelectedFileInfo& file, int index) {
std::string data;
// If we're doing a full export, the behaviour that is desired is the same as
// doing the full chain export.
if (full_export_) {
index = kBase64Chain + 1;
}
switch (index - 1) {
case kBase64Chain:
for (const auto& cert : cert_chain_list_) {
data += GetBase64String(cert.get());
}
break;
case kDer:
data = std::string(
net::x509_util::CryptoBufferAsStringPiece(cert_chain_list_[0].get()));
break;
case kPkcs7:
data = GetCMSString(0, 1);
break;
case kPkcs7Chain:
data = GetCMSString(0, cert_chain_list_.size());
break;
case kBase64:
default:
data = GetBase64String(cert_chain_list_[0].get());
break;
}
if (!data.empty()) {
base::ThreadPool::PostTask(
FROM_HERE, {base::MayBlock()},
base::BindOnce(&WriterCallback, file.path(), data));
}
delete this;
}
void Exporter::FileSelectionCanceled() {
delete this;
}
std::string Exporter::GetCMSString(size_t start, size_t end) const {
size_t size_hint = 64;
bssl::UniquePtr<STACK_OF(CRYPTO_BUFFER)> stack(sk_CRYPTO_BUFFER_new_null());
for (size_t i = start; i < end; ++i) {
if (!bssl::PushToStack(stack.get(), bssl::UpRef(cert_chain_list_[i]))) {
return std::string();
}
size_hint += CRYPTO_BUFFER_len(cert_chain_list_[i].get());
}
bssl::ScopedCBB cbb;
if (!CBB_init(cbb.get(), size_hint) ||
!PKCS7_bundle_raw_certificates(cbb.get(), stack.get())) {
return std::string();
}
return std::string(reinterpret_cast<const char*>(CBB_data(cbb.get())),
CBB_len(cbb.get()));
}
} // namespace
void ShowCertSelectFileDialog(ui::SelectFileDialog* select_file_dialog,
ui::SelectFileDialog::Type type,
const base::FilePath& suggested_path,
gfx::NativeWindow parent) {
ui::SelectFileDialog::FileTypeInfo file_type_info;
file_type_info.extensions.resize(kNumCertFileTypes);
file_type_info.extensions[kBase64].push_back(FILE_PATH_LITERAL("pem"));
file_type_info.extensions[kBase64].push_back(FILE_PATH_LITERAL("crt"));
file_type_info.extension_description_overrides.push_back(
l10n_util::GetStringUTF16(IDS_CERT_EXPORT_TYPE_BASE64));
file_type_info.extensions[kBase64Chain].push_back(FILE_PATH_LITERAL("pem"));
file_type_info.extensions[kBase64Chain].push_back(FILE_PATH_LITERAL("crt"));
file_type_info.extension_description_overrides.push_back(
l10n_util::GetStringUTF16(IDS_CERT_EXPORT_TYPE_BASE64_CHAIN));
file_type_info.extensions[kDer].push_back(FILE_PATH_LITERAL("der"));
file_type_info.extension_description_overrides.push_back(
l10n_util::GetStringUTF16(IDS_CERT_EXPORT_TYPE_DER));
file_type_info.extensions[kPkcs7].push_back(FILE_PATH_LITERAL("p7c"));
file_type_info.extension_description_overrides.push_back(
l10n_util::GetStringUTF16(IDS_CERT_EXPORT_TYPE_PKCS7));
file_type_info.extensions[kPkcs7Chain].push_back(FILE_PATH_LITERAL("p7c"));
file_type_info.extension_description_overrides.push_back(
l10n_util::GetStringUTF16(IDS_CERT_EXPORT_TYPE_PKCS7_CHAIN));
file_type_info.include_all_files = true;
select_file_dialog->SelectFile(
type, std::u16string(), suggested_path, &file_type_info,
1, // 1-based index for |file_type_info.extensions| to specify default.
FILE_PATH_LITERAL("crt"), parent);
}
void ShowCertExportDialog(content::WebContents* web_contents,
gfx::NativeWindow parent,
std::vector<bssl::UniquePtr<CRYPTO_BUFFER>> certs,
const std::string& cert_title) {
DCHECK(!certs.empty());
// Exporter is self-deleting.
new Exporter(web_contents, parent, std::move(certs), cert_title,
/*full_export=*/false);
}
#if BUILDFLAG(CHROME_ROOT_STORE_CERT_MANAGEMENT_UI)
void ShowCertExportDialogSaveAll(
content::WebContents* web_contents,
gfx::NativeWindow parent,
std::vector<bssl::UniquePtr<CRYPTO_BUFFER>> certs,
const std::string& suggested_file_name) {
DCHECK(!certs.empty());
// Exporter is self-deleting.
new Exporter(web_contents, parent, std::move(certs), suggested_file_name,
/*full_export=*/true);
}
#endif // BUILDFLAG(CHROME_ROOT_STORE_CERT_MANAGEMENT_UI)
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