c++ - KSP( key 存储提供程序)未通过凭据提供程序在登录时加载

Question

我正在创建 Windows 凭据提供程序以使用此 article 中所述的证书登录到 Windows 域.这意味着创建将在创建身份验证包时由 LsaLogonUser 调用的自定义 KSP。

我设法创建了自定义 KSP，并在直接调用 LsaLogonUser 的独立应用程序中成功测试了它。主要是创建身份验证包并将其传递给 LsaLogonUser，加载 KSP，调用一系列函数并对用户进行身份验证，并在状态代码和加载的用户配置文件上返回成功结果。

但是，当我在凭证上的 GetSerialization 期间使用相同的身份验证包时，KSP 甚至没有加载，我得到 ReportResult(NTSTATUS ntsStatus, NTSTATUS ntsSubstatus, ... .) 在 ntsStatus 上。

这是我在测试中使用的 GetSerialization 代码:

    HRESULT AOCredential::GetSerialization(
    CREDENTIAL_PROVIDER_GET_SERIALIZATION_RESPONSE *pcpgsr,
    CREDENTIAL_PROVIDER_CREDENTIAL_SERIALIZATION *pcpcs,
    PWSTR *ppwszOptionalStatusText,
    CREDENTIAL_PROVIDER_STATUS_ICON *pcpsiOptionalStatusIcon
)
{
    UNREFERENCED_PARAMETER(ppwszOptionalStatusText);
    UNREFERENCED_PARAMETER(pcpsiOptionalStatusIcon);

    HRESULT hr;

    ULONG ulAuthPackage;
    hr = RetrieveKerberosAuthPackage(&ulAuthPackage);

    if (SUCCEEDED(hr))
    {
        InitialiseKerbCertificateLogon(&pcpcs->rgbSerialization, &pcpcs->cbSerialization); // this package actually worked when calling LsaLogonUser function directly (the KSP gets loaded and the authentication succeeds)

        pcpcs->ulAuthenticationPackage = ulAuthPackage;
        pcpcs->clsidCredentialProvider = CLSID_CallsignProvider;
        *pcpgsr = CPGSR_RETURN_CREDENTIAL_FINISHED;
    }

    return hr;
}

我的问题是，为什么在直接从 LsaLogonUser 调用身份验证包时加载 KSP，而不是在 Windows 登录期间从 Credential Provider 调用。

InitialiseKerbCertificateLogon 代码是:

void InitialiseKerbCertificateLogon(PWSTR domain, PWSTR username, LPBYTE* authInfo, ULONG *authInfoLength)
{
    WCHAR szCardName[] = L"";
    WCHAR szContainerName[] = L"Default";
    WCHAR szReaderName[] = L"";
    WCHAR szCspName[] = CS_KSP_NAME;
    WCHAR szPin[] = CS_TEST_PIN;
    ULONG ulPinByteLen = (ULONG)(wcslen(szPin) * sizeof(WCHAR));
    WCHAR szUserName[] = CS_TEST_USERNAME;
    ULONG ulUserByteLen = (ULONG)(wcslen(szUserName) * sizeof(WCHAR));
    WCHAR szDomainName[] = CS_TEST_DOMAIN;
    ULONG ulDomainByteLen = (ULONG)(wcslen(szDomainName) * sizeof(WCHAR));
    LPBYTE pbAuthInfo = NULL;
    ULONG  ulAuthInfoLen = 0;
    KERB_CERTIFICATE_LOGON *pKerbCertLogon;
    KERB_SMARTCARD_CSP_INFO *pKerbCspInfo;
    LPBYTE pbDomainBuffer, pbUserBuffer, pbPinBuffer;
    LPBYTE pbCspData;
    LPBYTE pbCspDataContent;

    ULONG ulCspDataLen = (ULONG)(sizeof(KERB_SMARTCARD_CSP_INFO) - sizeof(TCHAR) +
        (wcslen(szCardName) + 1) * sizeof(WCHAR) +
        (wcslen(szCspName) + 1) * sizeof(WCHAR) +
        (wcslen(szContainerName) + 1) * sizeof(WCHAR) +
        (wcslen(szReaderName) + 1) * sizeof(WCHAR));

    ulAuthInfoLen = sizeof(KERB_CERTIFICATE_LOGON) +
        ulDomainByteLen + sizeof(WCHAR) +
        ulUserByteLen + sizeof(WCHAR) +
        ulPinByteLen + sizeof(WCHAR) +
        ulCspDataLen;

    pbAuthInfo = (LPBYTE)CoTaskMemAlloc(ulAuthInfoLen);
    ZeroMemory(pbAuthInfo, ulAuthInfoLen);

    pbDomainBuffer = pbAuthInfo + sizeof(KERB_CERTIFICATE_LOGON);
    pbUserBuffer = pbDomainBuffer + ulDomainByteLen + sizeof(WCHAR);
    pbPinBuffer = pbUserBuffer + ulUserByteLen + sizeof(WCHAR);
    pbCspData = pbPinBuffer + ulPinByteLen + sizeof(WCHAR);

    memcpy(pbDomainBuffer, szDomainName, ulDomainByteLen);
    memcpy(pbUserBuffer, szUserName, ulUserByteLen);
    memcpy(pbPinBuffer, szPin, ulPinByteLen);

    pKerbCertLogon = (KERB_CERTIFICATE_LOGON*)pbAuthInfo;

    pKerbCertLogon->MessageType = KerbCertificateLogon;
    pKerbCertLogon->DomainName.Length = (USHORT)ulDomainByteLen;
    pKerbCertLogon->DomainName.MaximumLength = (USHORT)(ulDomainByteLen + sizeof(WCHAR));
    pKerbCertLogon->DomainName.Buffer = (PWSTR)pbDomainBuffer;
    pKerbCertLogon->UserName.Length = (USHORT)ulUserByteLen;
    pKerbCertLogon->UserName.MaximumLength = (USHORT)(ulUserByteLen + sizeof(WCHAR));
    pKerbCertLogon->UserName.Buffer = (PWSTR)pbUserBuffer;
    pKerbCertLogon->Pin.Length = (USHORT)ulPinByteLen;
    pKerbCertLogon->Pin.MaximumLength = (USHORT)(ulPinByteLen + sizeof(WCHAR));
    pKerbCertLogon->Pin.Buffer = (PWSTR)pbPinBuffer;

    pKerbCertLogon->CspDataLength = ulCspDataLen;
    pKerbCertLogon->CspData = pbCspData;

    pKerbCspInfo = (KERB_SMARTCARD_CSP_INFO*)pbCspData;
    pKerbCspInfo->dwCspInfoLen = ulCspDataLen;
    pKerbCspInfo->MessageType = 1;
    pKerbCspInfo->KeySpec = AT_KEYEXCHANGE;
    pKerbCspInfo->nCardNameOffset = 0;
    pKerbCspInfo->nReaderNameOffset = pKerbCspInfo->nCardNameOffset + (ULONG)wcslen(szCardName) + 1;
    pKerbCspInfo->nContainerNameOffset = pKerbCspInfo->nReaderNameOffset + (ULONG)wcslen(szReaderName) + 1;
    pKerbCspInfo->nCSPNameOffset = pKerbCspInfo->nContainerNameOffset + (ULONG)wcslen(szContainerName) + 1;

    pbCspDataContent = pbCspData + sizeof(KERB_SMARTCARD_CSP_INFO) - sizeof(TCHAR);
    memcpy(pbCspDataContent + (pKerbCspInfo->nCardNameOffset * sizeof(WCHAR)), szCardName, wcslen(szCardName) * sizeof(WCHAR));
    memcpy(pbCspDataContent + (pKerbCspInfo->nReaderNameOffset * sizeof(WCHAR)), szReaderName, wcslen(szReaderName) * sizeof(WCHAR));
    memcpy(pbCspDataContent + (pKerbCspInfo->nContainerNameOffset * sizeof(WCHAR)), szContainerName, wcslen(szContainerName) * sizeof(WCHAR));
    memcpy(pbCspDataContent + (pKerbCspInfo->nCSPNameOffset * sizeof(WCHAR)), szCspName, wcslen(szCspName) * sizeof(WCHAR));

    *authInfo = pbAuthInfo;
    *authInfoLength = ulAuthInfoLen;
}

Answer 1

来自微软关于 KERB_CERTIFICATE_LOGON 结构的文档:

The pointers stored in the members of UNICODE_STRING type are relative to the beginning of the structure and are not absolute memory pointers.

但是文档没有告诉你 CspData 指针也应该相对于结构的开头...

当您使用带有绝对内存指针的数据调用 LsaLogonUser 时，它将起作用，当指针是相对的时也是如此。当数据被序列化时，将仅适用于所有相关指针。

有时(取决于 CREDENTIAL_PROVIDER_USAGE_SCENARIO)您应该使用 KERB_CERTIFICATE_UNLOCK_LOGON 而不是 KERB_CERTIFICATE_LOGON。