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/*
* Copyright (C) 2021 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "config.h"
#include <wtf/glib/Sandbox.h>
#include <gio/gio.h>
#include <wtf/FileSystem.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/glib/GRefPtr.h>
#include <wtf/text/CString.h>
namespace WTF {
bool isInsideFlatpak()
{
static bool returnValue = g_file_test("/.flatpak-info", G_FILE_TEST_EXISTS);
return returnValue;
}
#if ENABLE(BUBBLEWRAP_SANDBOX)
bool isInsideUnsupportedContainer()
{
static bool inContainer = g_file_test("/run/.containerenv", G_FILE_TEST_EXISTS);
static int supportedContainer = -1;
// Being in a container does not mean sub-containers cannot work. It depends upon various details such as
// docker vs podman, which permissions are given, is it privileged or unprivileged, and are unprivileged user namespaces enabled.
// So this just does a basic test of if `bwrap` runs successfully.
if (inContainer && supportedContainer == -1) {
const char* bwrapArgs[] = {
BWRAP_EXECUTABLE,
"--ro-bind", "/", "/",
"--proc", "/proc",
"--dev", "/dev",
"--unshare-all",
"true",
nullptr
};
int waitStatus = 0;
gboolean spawnSucceeded = g_spawn_sync(nullptr, const_cast<char**>(bwrapArgs), nullptr,
G_SPAWN_STDERR_TO_DEV_NULL, nullptr, nullptr, nullptr, nullptr, &waitStatus, nullptr);
supportedContainer = spawnSucceeded && g_spawn_check_exit_status(waitStatus, nullptr);
if (!supportedContainer)
WTFLogAlways("Bubblewrap does not work inside of this container, sandboxing will be disabled.");
}
return inContainer && !supportedContainer;
}
#endif
bool isInsideSnap()
{
// The "SNAP" environment variable is not unlikely to be set for/by something other
// than Snap, so check a couple of additional variables to avoid false positives.
// See: https://snapcraft.io/docs/environment-variables
static bool returnValue = g_getenv("SNAP") && g_getenv("SNAP_NAME") && g_getenv("SNAP_REVISION");
return returnValue;
}
bool shouldUseBubblewrap()
{
#if ENABLE(BUBBLEWRAP_SANDBOX)
return !isInsideFlatpak() && !isInsideSnap() && !isInsideUnsupportedContainer();
#else
return false;
#endif
}
bool shouldUsePortal()
{
static bool returnValue = []() -> bool {
const char* usePortal = isInsideFlatpak() || isInsideSnap() ? "1" : g_getenv("WEBKIT_USE_PORTAL");
return usePortal && usePortal[0] != '0';
}();
return returnValue;
}
bool checkFlatpakPortalVersion(int version)
{
static int flatpakPortalVersion = -1;
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
GRefPtr<GDBusProxy> proxy = adoptGRef(g_dbus_proxy_new_for_bus_sync(G_BUS_TYPE_SESSION, G_DBUS_PROXY_FLAGS_NONE, nullptr, "org.freedesktop.portal.Flatpak", "/org/freedesktop/portal/Flatpak", "org.freedesktop.portal.Flatpak", nullptr, nullptr));
if (!proxy)
return;
GRefPtr<GVariant> result = adoptGRef(g_dbus_proxy_get_cached_property(proxy.get(), "version"));
if (!result)
return;
flatpakPortalVersion = g_variant_get_uint32(result.get());
});
return flatpakPortalVersion != -1 && flatpakPortalVersion >= version;
}
const CString& sandboxedUserRuntimeDirectory()
{
static LazyNeverDestroyed<CString> userRuntimeDirectory;
static std::once_flag onceKey;
std::call_once(onceKey, [] {
#if PLATFORM(GTK)
static constexpr ASCIILiteral baseDirectory = "webkitgtk"_s;
#elif PLATFORM(WPE)
static constexpr ASCIILiteral baseDirectory = "wpe"_s;
#else
static constexpr ASCIILiteral baseDirectory = "javascriptcore"_s;
#endif
userRuntimeDirectory.construct(FileSystem::pathByAppendingComponent(FileSystem::stringFromFileSystemRepresentation(g_get_user_runtime_dir()), baseDirectory).utf8());
});
return userRuntimeDirectory.get();
}
} // namespace WTF
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