c++ - 在 Windows 8 中从 mmc.exe 获取数字签名

Question

我有一个应用程序试图验证 mmc.exe(服务)签名。 (我认为应用程序的上下文无关紧要)我正在尝试使用 winapi 函数，但都失败了 赢验证信任。当我尝试从目录进行验证时，我得到 TRUST_E_BAD_DIGEST，并且 TRUST_E_NOSIGNATURE 尝试使用文件信息时。非常重要的一点是，我的函数在 win7、XP 上成功但在 win8 上失败。

这是函数的代码片段

CATALOG_INFO InfoStruct = {0};
InfoStruct.cbStruct = sizeof(CATALOG_INFO);

WINTRUST_CATALOG_INFO WintrustCatalogStructure = {0};
WintrustCatalogStructure.cbStruct = sizeof(WINTRUST_CATALOG_INFO);

WINTRUST_FILE_INFO WintrustFileStructure = {0};
WintrustFileStructure.cbStruct = sizeof(WINTRUST_FILE_INFO);

GUID ActionGuid = WINTRUST_ACTION_GENERIC_VERIFY_V2;

//Get a context for signature verification.
HCATADMIN Context = NULL;
if(!::CryptCATAdminAcquireContext(&Context, NULL, 0) ){
    return false;
}

//Open file.

cx_handle hFile(::CreateFileW(filename_.c_str(), GENERIC_READ, 7, NULL, OPEN_EXISTING, 0, NULL));
if( INVALID_HANDLE_VALUE == (HANDLE)hFile )
{
    CryptCATAdminReleaseContext(Context, 0);
    return false;
}

//Get the size we need for our hash.
DWORD HashSize = 0;
::CryptCATAdminCalcHashFromFileHandle(hFile, &HashSize, NULL, 0);
if( HashSize == 0 )
{
    //0-sized has means error!
    ::CryptCATAdminReleaseContext(Context, 0);
    return false;
}

//Allocate memory.
buffer hashbuf(HashSize);

//Actually calculate the hash
if( !CryptCATAdminCalcHashFromFileHandle(hFile, &HashSize, hashbuf.data, 0) )
{
    CryptCATAdminReleaseContext(Context, 0);
    return false;
}

//Convert the hash to a string.
buffer MemberTag(((HashSize * 2) + 1) * sizeof(wchar_t));
for( unsigned int i = 0; i < HashSize; i++ ){
    swprintf(&((PWCHAR)MemberTag.data)[i * 2], L"%02X", hashbuf.data[i ]);
}

//Get catalog for our context.
HCATINFO CatalogContext = CryptCATAdminEnumCatalogFromHash(Context, hashbuf, HashSize, 0, NULL);
if ( CatalogContext )
{
    //If we couldn't get information
    if ( !CryptCATCatalogInfoFromContext(CatalogContext, &InfoStruct, 0) )
    {
        //Release the context and set the context to null so it gets picked up below.
        CryptCATAdminReleaseCatalogContext(Context, CatalogContext, 0);
        CatalogContext = NULL;
    }
}

//If we have a valid context, we got our info.  
//Otherwise, we attempt to verify the internal signature.

WINTRUST_DATA WintrustStructure = {0};
WintrustStructure.cbStruct = sizeof(WINTRUST_DATA);

if( !CatalogContext )
{
    load_signature_verification_from_file_info(WintrustFileStructure, WintrustStructure);
} 
else
{
    load_signature_verification_from_catalog(WintrustStructure, WintrustCatalogStructure, InfoStruct, MemberTag);
}

//Call our verification function.
long verification_res = ::WinVerifyTrust(0, &ActionGuid, &WintrustStructure);

//Check return.
bool is_success = SUCCEEDED(verification_res) ? true : false;

// if failed with CatalogContext, try with FILE_INFO
if(!is_success && CatalogContext && verification_res != TRUST_E_NOSIGNATURE)
{
    //warning2(L"Failed verification with Catalog Context: 0x%x %s ; Retrying with FILE_INFO.", verification_res, (const wchar_t*)format_last_error(verification_res));

    load_signature_verification_from_file_info(WintrustFileStructure, WintrustStructure);
    verification_res = ::WinVerifyTrust(0, &ActionGuid, &WintrustStructure);
    is_success = SUCCEEDED(verification_res) ? true : false;
}

if(perr && !is_success && verification_res != TRUST_E_NOSIGNATURE)
{
    perr->code = verification_res;
    perr->description = format_last_error(verification_res);
}

//Free context.
if( CatalogContext ){
    ::CryptCATAdminReleaseCatalogContext(Context, CatalogContext, 0);
}

//If we successfully verified, we need to free.
if( is_success )
{
    WintrustStructure.dwStateAction = WTD_STATEACTION_CLOSE;
    ::WinVerifyTrust(0, &ActionGuid, &WintrustStructure);
}

::CryptCATAdminReleaseContext(Context, 0);

return is_success;

我认为这个函数从 win7 到 win 8 没有任何变化，所以可能会出现什么问题？

更新

我确实注意到我的函数在 win 8 中确实适用于任务管理器。 但同样对于 mmc 它不起作用。

Answer 1

看来您的一般方法是正确的，并且函数本身没有改变。但是有细微的变化；即他们操作的数据已经改变。根据 CryptCATAdminCalcHashFromFileHandle 上的评论，为 Windows 8 上的文件存储的哈希值, 是使用 SHA-256 哈希计算的。

CryptCATAdminCalcHashFromFileHandle 不支持 SHA-256 哈希算法，因此您必须更新代码才能使用 CryptCATAdminAcquireContext2 和 CryptCATAdminCalcHashFromFileHandle2在 Windows 8 上；前者允许您使用指定的哈希算法获取 HCATADMIN，后者允许使用该 HCATADMIN。

(有趣的是，WINTRUST_CATALOG_INFO 也通过其 HCATADMIN hCatAdmin 成员指出了这个方向，记录为“Windows 8 和 Windows Server 2012:开始支持该成员。” )