C - Verify code signatures - Windows API

问题

I need to verify code signatures of binaries. Microsoft Authenticode I think is the term. Is there a sane way to do this using the Windows API?

回答1:

Have you looked at WinVerifyTrust ? Since it's not immediately obvious how to use it to verify the signature of a binary, you probably want to look at the sample code specifically for that.

回答2:

How to find authenticode for drivers:

Disclaimer: I did not write this code.

BOOL VerifyEmbeddedSignature(LPCWSTR pwszSourceFile)
{
LONG lStatus;
GUID WintrustVerifyGuid = WINTRUST_ACTION_GENERIC_VERIFY_V2;
GUID DriverActionGuid = DRIVER_ACTION_VERIFY;
HANDLE hFile;
DWORD dwHash;
BYTE bHash[100];
HCATINFO hCatInfo;
HCATADMIN hCatAdmin;

WINTRUST_DATA wd = { 0 };
WINTRUST_FILE_INFO wfi = { 0 };
WINTRUST_CATALOG_INFO wci = { 0 };

////set up structs to verify files with cert signatures
memset(&wfi, 0, sizeof(wfi));
wfi.cbStruct               = sizeof( WINTRUST_FILE_INFO );
wfi.pcwszFilePath          = pwszSourceFile;
wfi.hFile                  = NULL;
wfi.pgKnownSubject         = NULL;

memset(&wd, 0, sizeof(wd));
wd.cbStruct                = sizeof( WINTRUST_DATA );
wd.dwUnionChoice           = WTD_CHOICE_FILE;
wd.pFile                   = &wfi;
wd.dwUIChoice              = WTD_UI_NONE;
wd.fdwRevocationChecks     = WTD_REVOKE_NONE;
wd.dwStateAction           = 0;
wd.dwProvFlags             = WTD_SAFER_FLAG;
wd.hWVTStateData           = NULL;
wd.pwszURLReference        = NULL;
wd.pPolicyCallbackData    = NULL;
wd.pSIPClientData        = NULL;
wd.dwUIContext            = 0;

lStatus = WinVerifyTrust( NULL, &WintrustVerifyGuid, &wd );

////if failed, try to verify using catalog files
if (lStatus != ERROR_SUCCESS)
{
    //open the file
    hFile = CreateFileW(pwszSourceFile, GENERIC_READ,  FILE_SHARE_READ, NULL,  OPEN_EXISTING,  FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE)
        return FALSE;

    dwHash = sizeof(bHash);
    if (!CryptCATAdminCalcHashFromFileHandle(hFile, &dwHash, bHash, 0))
    {
        CloseHandle(hFile);
        return FALSE;
    }

    //Create a string form of the hash (used later in pszMemberTag)
    LPWSTR pszMemberTag = new WCHAR[dwHash * 2 + 1];
    for ( DWORD dw = 0; dw < dwHash; ++dw )
    {
        wsprintfW( &pszMemberTag[dw * 2], L"%02X", bHash[dw] );
    }

    if (!CryptCATAdminAcquireContext(&hCatAdmin, &DriverActionGuid, 0))
    {
        CloseHandle(hFile);
        return FALSE;
    }

    //find the catalog which contains the hash
    hCatInfo = CryptCATAdminEnumCatalogFromHash(hCatAdmin, bHash, dwHash, 0, NULL);

    if ( hCatInfo )
    {
        CATALOG_INFO ci = { 0 };
        CryptCATCatalogInfoFromContext( hCatInfo, &ci, 0 );

        memset(&wci, 0, sizeof(wci));
        wci.cbStruct                 = sizeof( WINTRUST_CATALOG_INFO );
        wci.pcwszCatalogFilePath     = ci.wszCatalogFile;
        wci.pcwszMemberFilePath      = pwszSourceFile;
        wci.pcwszMemberTag           = pszMemberTag;

        memset(&wd, 0, sizeof(wd));
        wd.cbStruct                    = sizeof( WINTRUST_DATA );
        wd.dwUnionChoice               = WTD_CHOICE_CATALOG;
        wd.pCatalog                    = &wci;
        wd.dwUIChoice                  = WTD_UI_NONE;
        wd.fdwRevocationChecks         = WTD_STATEACTION_VERIFY;
        wd.dwProvFlags                 = 0;
        wd.hWVTStateData               = NULL;
        wd.pwszURLReference            = NULL;
        wd.pPolicyCallbackData        = NULL;
        wd.pSIPClientData            = NULL;
        wd.dwUIContext                = 0;

        lStatus = WinVerifyTrust( NULL, &WintrustVerifyGuid, &wd );

        CryptCATAdminReleaseCatalogContext( hCatAdmin, hCatInfo, 0 );
    }


    CryptCATAdminReleaseContext( hCatAdmin, 0 );
    delete[] pszMemberTag;
    CloseHandle(hFile);
}

if (lStatus != ERROR_SUCCESS)
    return false;
else
    return true;
}

来源：https://stackoverflow.com/questions/5746313/c-verify-code-signatures-windows-api

标签

api

code-signing

authenticode