gecko/toolkit/components/maintenanceservice/registrycertificates.cpp

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2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include "registrycertificates.h"
#include "pathhash.h"
#include "nsWindowsHelpers.h"
#include "servicebase.h"
#include "updatehelper.h"
#define MAX_KEY_LENGTH 255
/**
* Verifies if the file path matches any certificate stored in the registry.
*
* @param filePath The file path of the application to check if allowed.
* @return TRUE if the binary matches any of the allowed certificates.
*/
BOOL
DoesBinaryMatchAllowedCertificates(LPCWSTR basePathForUpdate, LPCWSTR filePath)
{
WCHAR maintenanceServiceKey[MAX_PATH + 1];
if (!CalculateRegistryPathFromFilePath(basePathForUpdate,
maintenanceServiceKey)) {
return FALSE;
}
// We use KEY_WOW64_64KEY to always force 64-bit view.
// The user may have both x86 and x64 applications installed
// which each register information. We need a consistent place
// to put those certificate attributes in and hence why we always
// force the non redirected registry under Wow6432Node.
// This flag is ignored on 32bit systems.
HKEY baseKeyRaw;
LONG retCode = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
maintenanceServiceKey, 0,
KEY_READ | KEY_WOW64_64KEY, &baseKeyRaw);
if (retCode != ERROR_SUCCESS) {
LOG(("Could not open key. (%d)\n", retCode));
// Our tests run with a different apply directory for each test.
// We use this registry key on our test slaves to store the
// allowed name/issuers.
retCode = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
TEST_ONLY_FALLBACK_KEY_PATH, 0,
KEY_READ | KEY_WOW64_64KEY, &baseKeyRaw);
if (retCode != ERROR_SUCCESS) {
LOG(("Could not open fallback key. (%d)\n", retCode));
return FALSE;
}
}
nsAutoRegKey baseKey(baseKeyRaw);
// Get the number of subkeys.
DWORD subkeyCount = 0;
retCode = RegQueryInfoKeyW(baseKey, NULL, NULL, NULL, &subkeyCount, NULL,
NULL, NULL, NULL, NULL, NULL, NULL);
if (retCode != ERROR_SUCCESS) {
LOG(("Could not query info key: %d\n", retCode));
return FALSE;
}
// Enumerate the subkeys, each subkey represents an allowed certificate.
for (DWORD i = 0; i < subkeyCount; i++) {
WCHAR subkeyBuffer[MAX_KEY_LENGTH];
DWORD subkeyBufferCount = MAX_KEY_LENGTH;
retCode = RegEnumKeyExW(baseKey, i, subkeyBuffer,
&subkeyBufferCount, NULL,
NULL, NULL, NULL);
if (retCode != ERROR_SUCCESS) {
LOG(("Could not enum Certs: %d\n", retCode));
return FALSE;
}
// Open the subkey for the current certificate
HKEY subKeyRaw;
retCode = RegOpenKeyExW(baseKey,
subkeyBuffer,
0,
KEY_READ | KEY_WOW64_64KEY,
&subKeyRaw);
nsAutoRegKey subKey(subKeyRaw);
if (retCode != ERROR_SUCCESS) {
LOG(("Could not open subkey: %d\n", retCode));
continue; // Try the next subkey
}
const int MAX_CHAR_COUNT = 256;
DWORD valueBufSize = MAX_CHAR_COUNT * sizeof(WCHAR);
WCHAR name[MAX_CHAR_COUNT] = { L'\0' };
WCHAR issuer[MAX_CHAR_COUNT] = { L'\0' };
// Get the name from the registry
retCode = RegQueryValueExW(subKey, L"name", 0, NULL,
(LPBYTE)name, &valueBufSize);
if (retCode != ERROR_SUCCESS) {
LOG(("Could not obtain name from registry: %d\n", retCode));
continue; // Try the next subkey
}
// Get the issuer from the registry
valueBufSize = MAX_CHAR_COUNT * sizeof(WCHAR);
retCode = RegQueryValueExW(subKey, L"issuer", 0, NULL,
(LPBYTE)issuer, &valueBufSize);
if (retCode != ERROR_SUCCESS) {
LOG(("Could not obtain issuer from registry: %d\n", retCode));
continue; // Try the next subkey
}
CertificateCheckInfo allowedCertificate = {
name,
issuer,
};
retCode = CheckCertificateForPEFile(filePath, allowedCertificate);
if (retCode != ERROR_SUCCESS) {
LOG(("Error on certificate check: %d\n", retCode));
continue; // Try the next subkey
}
retCode = VerifyCertificateTrustForFile(filePath);
if (retCode != ERROR_SUCCESS) {
LOG(("Error on certificate trust check: %d\n", retCode));
continue; // Try the next subkey
}
// Raise the roof, we found a match!
return TRUE;
}
// No certificates match, :'(
return FALSE;
}