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Windows: Escape URLs passed to SellExecute (fixes issue #3133)

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This commit is contained in:
Marshall Greenblatt 2021-09-27 14:15:35 +03:00
parent 4d1c5ebdd2
commit 659c037c84
1 changed files with 36 additions and 9 deletions
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45
libcef/browser/native/browser_platform_delegate_native_win.cc
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@ -16,8 +16,10 @@
#include "libcef/browser/native/window_delegate_view.h" #include "libcef/browser/native/window_delegate_view.h"
#include "libcef/browser/thread_util.h" #include "libcef/browser/thread_util.h"
#include "base/base_paths_win.h"
#include "base/files/file_util.h" #include "base/files/file_util.h"
#include "base/memory/ref_counted_memory.h" #include "base/memory/ref_counted_memory.h"
#include "base/path_service.h"
#include "base/strings/utf_string_conversions.h" #include "base/strings/utf_string_conversions.h"
#include "base/win/registry.h" #include "base/win/registry.h"
#include "base/win/win_util.h" #include "base/win/win_util.h"
@ -60,12 +62,6 @@ void WriteTempFileAndView(scoped_refptr<base::RefCountedString> str) {
ui::win::OpenFileViaShell(tmp_file); ui::win::OpenFileViaShell(tmp_file);
} }
// According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
// "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
// ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
// support URLS of 2083 chars in length, 2K is safe."
const int kMaxAddressLengthChars = 2048;
bool HasExternalHandler(const std::string& scheme) { bool HasExternalHandler(const std::string& scheme) {
base::win::RegKey key; base::win::RegKey key;
const std::wstring registry_path = const std::wstring registry_path =
@ -84,17 +80,48 @@ bool HasExternalHandler(const std::string& scheme) {
return false; return false;
} }
// Match the logic in chrome/browser/platform_util_win.cc
// OpenExternalOnWorkerThread.
void ExecuteExternalProtocol(const GURL& url) { void ExecuteExternalProtocol(const GURL& url) {
CEF_REQUIRE_BLOCKING(); CEF_REQUIRE_BLOCKING();
if (!HasExternalHandler(url.scheme())) if (!HasExternalHandler(url.scheme()))
return; return;
const std::string& address = url.spec(); // Quote the input scheme to be sure that the command does not have
if (address.length() > kMaxAddressLengthChars) // parameters unexpected by the external program. This url should already
// have been escaped.
std::string escaped_url = url.spec();
escaped_url.insert(0, "\"");
escaped_url += "\"";
// According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
// "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
// ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
// support URLS of 2083 chars in length, 2K is safe."
//
// It may be possible to increase this. https://crbug.com/727909
const size_t kMaxUrlLength = 2048;
if (escaped_url.length() > kMaxUrlLength)
return; return;
ShellExecuteA(NULL, "open", address.c_str(), NULL, NULL, SW_SHOWNORMAL); // Specify %windir%\system32 as the CWD so that any new proc spawned does not
// inherit this proc's CWD. Without this, uninstalls may be broken by a
// long-lived child proc that holds a handle to the browser's version
// directory (the browser's CWD). A process's CWD is in the standard list of
// directories to search when loading a DLL, and precedes the system directory
// when safe DLL search mode is disabled (not the default). Setting the CWD to
// the system directory is a nice way to mitigate a potential DLL search order
// hijack for processes that don't implement their own mitigation.
base::FilePath system_dir;
base::PathService::Get(base::DIR_SYSTEM, &system_dir);
if (reinterpret_cast<ULONG_PTR>(ShellExecuteA(
NULL, "open", escaped_url.c_str(), NULL,
system_dir.AsUTF8Unsafe().c_str(), SW_SHOWNORMAL)) <= 32) {
// On failure, it may be good to display a message to the user.
// https://crbug.com/727913
return;
}
} }
// DPI value for 1x scale factor. // DPI value for 1x scale factor.