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// Copyright 2023 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/smart_card/chromeos_smart_card_delegate.h"
#include "base/check.h"
#include "base/check_deref.h"
#include "base/time/time.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/smart_card/get_smart_card_context_factory.h"
#include "chrome/browser/smart_card/smart_card_permission_context.h"
#include "chrome/browser/smart_card/smart_card_permission_context_factory.h"
#include "chrome/browser/ui/browser_window/public/browser_window_interface.h"
#include "components/content_settings/browser/page_specific_content_settings.h"
#include "components/tabs/public/tab_interface.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "third_party/blink/public/common/features.h"
namespace {
// kSmartCardAllowedReconnectTime is amount of time after which a new connection
// to a smart card reader stops being deemed a reconnection (and isn't possible
// from the background).
BASE_FEATURE_PARAM(base::TimeDelta,
kSmartCardAllowedReconnectTime,
&blink::features::kSmartCard,
"allowed_reconnect_time",
base::Seconds(15));
// The check whether the window has focus is enough here, as this is for IWAs
// only, which appear in standalone windows dedicated to only them.
bool WindowHasFocus(content::RenderFrameHost& render_frame_host) {
content::WebContents* tab_web_contents =
content::WebContents::FromRenderFrameHost(&render_frame_host)
->GetOutermostWebContents();
CHECK(tab_web_contents);
// For the case when this is called in permission revoke handler called after
// closing the last windows of the origin (and thus expiring the one-time
// permission). Calling `tabs::TabInterface::GetFromContents` when the tab is
// closing will crash.
if (tab_web_contents->IsBeingDestroyed()) {
return false;
}
return tabs::TabInterface::GetFromContents(tab_web_contents)
->GetBrowserWindowInterface()
->IsActive();
}
bool RecentlyHadConnection(content::RenderFrameHost& render_frame_host) {
auto& pscs =
CHECK_DEREF(content_settings::PageSpecificContentSettings::GetForFrame(
&render_frame_host));
return pscs.GetLastUsedTime(ContentSettingsType::SMART_CARD_GUARD) >=
base::Time::Now() - kSmartCardAllowedReconnectTime.Get() ||
pscs.IsInUse(ContentSettingsType::SMART_CARD_GUARD);
}
bool HasFocusOrRecentlyHadConnection(
content::RenderFrameHost& render_frame_host) {
return WindowHasFocus(render_frame_host) ||
RecentlyHadConnection(render_frame_host);
}
} // namespace
ChromeOsSmartCardDelegate::ChromeOsSmartCardDelegate() = default;
ChromeOsSmartCardDelegate::~ChromeOsSmartCardDelegate() = default;
mojo::PendingRemote<device::mojom::SmartCardContextFactory>
ChromeOsSmartCardDelegate::GetSmartCardContextFactory(
content::BrowserContext& browser_context) {
return ::GetSmartCardContextFactory(browser_context);
}
bool ChromeOsSmartCardDelegate::IsPermissionBlocked(
content::RenderFrameHost& render_frame_host) {
auto& profile = CHECK_DEREF(
Profile::FromBrowserContext(render_frame_host.GetBrowserContext()));
auto& permission_context =
SmartCardPermissionContextFactory::GetForProfile(profile);
const url::Origin& origin =
render_frame_host.GetMainFrame()->GetLastCommittedOrigin();
return !permission_context.CanRequestObjectPermission(origin) &&
!permission_context.IsAllowlistedByPolicy(origin);
}
bool ChromeOsSmartCardDelegate::HasReaderPermission(
content::RenderFrameHost& render_frame_host,
const std::string& reader_name) {
auto& profile = CHECK_DEREF(
Profile::FromBrowserContext(render_frame_host.GetBrowserContext()));
auto& permission_context =
SmartCardPermissionContextFactory::GetForProfile(profile);
return HasFocusOrRecentlyHadConnection(render_frame_host) &&
permission_context.HasReaderPermission(render_frame_host, reader_name);
}
void ChromeOsSmartCardDelegate::RequestReaderPermission(
content::RenderFrameHost& render_frame_host,
const std::string& reader_name,
RequestReaderPermissionCallback callback) {
// Never allow requesting permissions from the background.
if (!WindowHasFocus(render_frame_host)) {
std::move(callback).Run(false);
return;
}
auto& profile = CHECK_DEREF(
Profile::FromBrowserContext(render_frame_host.GetBrowserContext()));
auto& permission_context =
SmartCardPermissionContextFactory::GetForProfile(profile);
permission_context.RequestReaderPermisssion(render_frame_host, reader_name,
std::move(callback));
}
void ChromeOsSmartCardDelegate::NotifyConnectionUsed(
content::RenderFrameHost& render_frame_host) {
CHECK_DEREF(content_settings::PageSpecificContentSettings::GetForFrame(
&render_frame_host))
.OnDeviceUsed(
content_settings::mojom::ContentSettingsType::SMART_CARD_GUARD);
}
void ChromeOsSmartCardDelegate::NotifyLastConnectionLost(
content::RenderFrameHost& render_frame_host) {
CHECK_DEREF(content_settings::PageSpecificContentSettings::GetForFrame(
&render_frame_host))
.OnLastDeviceConnectionLost(
content_settings::mojom::ContentSettingsType::SMART_CARD_GUARD);
}
void ChromeOsSmartCardDelegate::AddObserver(
content::RenderFrameHost& render_frame_host,
PermissionObserver* observer) {
SmartCardPermissionContextFactory::GetForProfile(
CHECK_DEREF(
Profile::FromBrowserContext(render_frame_host.GetBrowserContext())))
.AddObserver(observer);
}
void ChromeOsSmartCardDelegate::RemoveObserver(
content::RenderFrameHost& render_frame_host,
PermissionObserver* observer) {
SmartCardPermissionContextFactory::GetForProfile(
CHECK_DEREF(
Profile::FromBrowserContext(render_frame_host.GetBrowserContext())))
.RemoveObserver(observer);
}
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