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[Qt] seed OpenSSL PNRG with Windows event data

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- see https://bitcointalk.org/index.php?topic=113496.msg1228193#msg1228193
  for the initial suggestion for this
- also ensure consistent debug.log message format
This commit is contained in:
Philip Kaufmann 2014-06-24 14:33:38 +02:00
parent e81e2e8f7c
commit 674c070e5d
1 changed files with 16 additions and 3 deletions
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19
src/qt/winshutdownmonitor.cpp
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@ -6,11 +6,14 @@
#if defined(Q_OS_WIN) && QT_VERSION >= 0x050000 #if defined(Q_OS_WIN) && QT_VERSION >= 0x050000
#include "init.h" #include "init.h"
#include "util.h"
#include <windows.h> #include <windows.h>
#include <QDebug> #include <QDebug>
#include <openssl/rand.h>
// If we don't want a message to be processed by Qt, return true and set result to // If we don't want a message to be processed by Qt, return true and set result to
// the value that the window procedure should return. Otherwise return false. // the value that the window procedure should return. Otherwise return false.
bool WinShutdownMonitor::nativeEventFilter(const QByteArray &eventType, void *pMessage, long *pnResult) bool WinShutdownMonitor::nativeEventFilter(const QByteArray &eventType, void *pMessage, long *pnResult)
@ -19,6 +22,16 @@ bool WinShutdownMonitor::nativeEventFilter(const QByteArray &eventType, void *pM
MSG *pMsg = static_cast<MSG *>(pMessage); MSG *pMsg = static_cast<MSG *>(pMessage);
// Seed OpenSSL PRNG with Windows event data (e.g. mouse movements and other user interactions)
if (RAND_event(pMsg->message, pMsg->wParam, pMsg->lParam) == 0) {
// Warn only once as this is performance-critical
static bool warned = false;
if (!warned) {
LogPrint("%s: OpenSSL RAND_event() failed to seed OpenSSL PRNG with enough data.\n", __func__);
warned = true;
}
}
switch(pMsg->message) switch(pMsg->message)
{ {
case WM_QUERYENDSESSION: case WM_QUERYENDSESSION:
@ -45,13 +58,13 @@ void WinShutdownMonitor::registerShutdownBlockReason(const QString& strReason, c
typedef BOOL (WINAPI *PSHUTDOWNBRCREATE)(HWND, LPCWSTR); typedef BOOL (WINAPI *PSHUTDOWNBRCREATE)(HWND, LPCWSTR);
PSHUTDOWNBRCREATE shutdownBRCreate = (PSHUTDOWNBRCREATE)GetProcAddress(GetModuleHandleA("User32.dll"), "ShutdownBlockReasonCreate"); PSHUTDOWNBRCREATE shutdownBRCreate = (PSHUTDOWNBRCREATE)GetProcAddress(GetModuleHandleA("User32.dll"), "ShutdownBlockReasonCreate");
if (shutdownBRCreate == NULL) { if (shutdownBRCreate == NULL) {
qWarning() << "registerShutdownBlockReason : GetProcAddress for ShutdownBlockReasonCreate failed"; qWarning() << "registerShutdownBlockReason: GetProcAddress for ShutdownBlockReasonCreate failed";
return; return;
} }
if (shutdownBRCreate(mainWinId, strReason.toStdWString().c_str())) if (shutdownBRCreate(mainWinId, strReason.toStdWString().c_str()))
qWarning() << "registerShutdownBlockReason : Successfully registered: " + strReason; qWarning() << "registerShutdownBlockReason: Successfully registered: " + strReason;
else else
qWarning() << "registerShutdownBlockReason : Failed to register: " + strReason; qWarning() << "registerShutdownBlockReason: Failed to register: " + strReason;
} }
#endif #endif