那些遇到过的问题

从可执行文件中读取多个签名

Dim*_*ima 14 c++ signatures authenticode

我正在尝试编写从DLL或EXE读取签名(证书)的代码.大多数DLL或EXE只有一个签名,我的代码正确读取与此签名关联的所有证书.更具体地说,它读取签名证书,它是发行者(不是root),签名证书(带有时间戳)和它的发行者(不是root).我有2个C++和C#示例程序,它们都返回相同的证书.这是C#代码,C++是100倍长:)

static void Main(string[] args)
{
    X509Certificate2Collection collection = new X509Certificate2Collection();
    collection.Import(args[0]);
}
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但是有一些DLL有2个签名,如文件属性/数字签名所示,例如C:\ Program Files(x86)\ Microsoft SQL Server\80\Tools\Binn\msvcr71.dll:

msvcr71.dll的文件属性和数字签名

对于此DLL,我的代码只读取与第一个签名关联的证书.

我也尝试使用signtool,它返回与我的代码相同的信息:first cert(带有它的路径)和counterignature(带有它的路径).但最后还要注意错误.

C:\Windows>signtool verify /d /v "C:\Program Files (x86)\Microsoft SQL Server\80\Tools\Binn\msvcr71.dll"

Verifying: C:\Program Files (x86)\Microsoft SQL Server\80\Tools\Binn\msvcr71.dll
Signature Index: 0 (Primary Signature)
Hash of file (sha1): 33BBCCF6326276B413A1ECED1BF7842A6D1DDA07

Signing Certificate Chain:
Issued to: Microsoft Root Certificate Authority
Issued by: Microsoft Root Certificate Authority
Expires:   Sun May 09 19:28:13 2021
SHA1 hash: CDD4EEAE6000AC7F40C3802C171E30148030C072

    Issued to: Microsoft Code Signing PCA
    Issued by: Microsoft Root Certificate Authority
    Expires:   Wed Jan 25 19:32:32 2017
    SHA1 hash: FDD1314ED3268A95E198603BA8316FA63CBCD82D

        Issued to: Microsoft Corporation
        Issued by: Microsoft Code Signing PCA
        Expires:   Fri Feb 01 18:49:17 2013
        SHA1 hash: 8849D1C0F147A3C8327B4038783AEC3E06C76F5B

The signature is timestamped: Sat Feb 11 14:03:12 2012
Timestamp Verified by:
Issued to: Microsoft Root Certificate Authority
Issued by: Microsoft Root Certificate Authority
Expires:   Sun May 09 19:28:13 2021
SHA1 hash: CDD4EEAE6000AC7F40C3802C171E30148030C072

    Issued to: Microsoft Time-Stamp PCA
    Issued by: Microsoft Root Certificate Authority
    Expires:   Sat Apr 03 09:03:09 2021
    SHA1 hash: 375FCB825C3DC3752A02E34EB70993B4997191EF

        Issued to: Microsoft Time-Stamp Service
        Issued by: Microsoft Time-Stamp PCA
        Expires:   Thu Oct 25 16:42:17 2012
        SHA1 hash: FC33104FAE31FB538749D5F2D17FA0ECB819EAE5

SignTool Error: The signing certificate is not valid for the requested usage.
    This error sometimes means that you are using the wrong verification
    policy. Consider using the /pa option.

Number of files successfully Verified: 0
Number of warnings: 0
Number of errors: 1
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我有两个问题: - 第二个签名的目的是什么 - 如何阅读它(到目前为止只有Windows资源管理器文件属性对话框可以显示它).

谢谢!

Dim*_*ima 15

经过大量挖掘和尝试不同的事情,我发现函数WinVerifyTrust可以读取多个嵌入式证书.忽略函数名称,它可以用于很多东西,它是一个通用函数.

WinVerifyTrust将struct WINTRUST_DATA作为其输入/输出参数之一.Docs说它是IN,但它也用于返回信息.

WINTRUST_DATAhas field pSignatureSettings,是指向另一个struct的指针WINTRUST_SIGNATURE_SETTINGS.此stuct具有dwFlags控制WinVerifyTrust将返回哪些信息的字段.

首先,你打电话的WinVerifyTrust与WINTRUST_SIGNATURE_SETTINGS::dwFlags = WSS_GET_SECONDARY_SIG_COUNT找回二次签名,这是在外地回来的数量WINTRUST_SIGNATURE_SETTINGS::cSecondarySigs.请注意,如果您的文件有2个签名,则为cSecondarySigs1.

然后在循环中用和for (int i = 0; i <= cSecondarySigs; i++)调用WinVerifyTrust.WINTRUST_SIGNATURE_SETTINGS::dwFlags = WSS_VERIFY_SPECIFICWINTRUST_SIGNATURE_SETTINGS::dwIndex = i

在每次WinVerifyTrust调用之后,您可以WINTRUST_DATA::hWVTStateData通过此调用序列获取证书信息(包括签名):

WTHelperProvDataFromStateData(hWVTStateData);
WTHelperGetProvSignerFromChain(...);
WTHelperGetProvCertFromChain(...);
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我没有深入研究.NET API,但它似乎只能读取第一个签名.请注意,WINTRUST_SIGNATURE_SETTINGS在Windows 8中添加了似乎是读取多个签名的关键,因此在较旧的操作系统上,您将无法读取它,至少不能使用MS API.

izo*_*fif 6

扩展Dima的答案,我想提供一个示例代码,演示如何检查所有嵌入(和嵌套)叶子(不在证书链中间)证书.

BOOL CheckCertificateIssuer(HANDLE hWVTStateData, const std::set<CString> &stValidIssuers)
{
    CRYPT_PROVIDER_DATA *pCryptProvData = WTHelperProvDataFromStateData(hWVTStateData);
    CRYPT_PROVIDER_SGNR *pSigner = WTHelperGetProvSignerFromChain(pCryptProvData, 0, FALSE, 0);
    CRYPT_PROVIDER_CERT *pCert = WTHelperGetProvCertFromChain(pSigner, 0);

    CString sIssuer;
    int nLength = CertGetNameString(pCert->pCert, CERT_NAME_SIMPLE_DISPLAY_TYPE, CERT_NAME_ISSUER_FLAG, NULL, NULL, 0);
    if (!nLength)
    {
        ASSERT(FALSE && "Cannot get the length of the Issuer string");
        return FALSE;
    }

    if (!CertGetNameString(pCert->pCert, CERT_NAME_SIMPLE_DISPLAY_TYPE, CERT_NAME_ISSUER_FLAG, NULL, sIssuer.GetBuffer(nLength), nLength))
    {
        ASSERT(FALSE && "Cannot get the Issuer string");
        return FALSE;
    }
    sIssuer.ReleaseBuffer(nLength);
    if (stValidIssuers.find(sIssuer) == stValidIssuers.end())
    {
        ASSERT(FALSE && "Certificate issuer is invalid");
        return FALSE;
    }
    return TRUE;
}
BOOL CheckCertificate(CString filename)
{
    std::set<CString> stValidIssuers;
    stValidIssuers.insert(L"VeriSign Class 3 Code Signing 2010 CA");
    stValidIssuers.insert(L"Symantec Class 3 SHA256 Code Signing CA");

    bool UseStrongSigPolicy = false;

    DWORD Error = ERROR_SUCCESS;
    bool WintrustCalled = false;
    GUID GenericActionId = WINTRUST_ACTION_GENERIC_VERIFY_V2;
    WINTRUST_DATA WintrustData = {};
    WINTRUST_FILE_INFO FileInfo = {};
    WINTRUST_SIGNATURE_SETTINGS SignatureSettings = {};
    CERT_STRONG_SIGN_PARA StrongSigPolicy = {};

    // Setup data structures for calling WinVerifyTrust
    WintrustData.cbStruct = sizeof(WINTRUST_DATA);
    WintrustData.dwStateAction = WTD_STATEACTION_VERIFY;
    WintrustData.dwUIChoice = WTD_UI_NONE;
    WintrustData.fdwRevocationChecks = WTD_REVOKE_NONE;
    WintrustData.dwUnionChoice = WTD_CHOICE_FILE;

    FileInfo.cbStruct = sizeof(WINTRUST_FILE_INFO_);
    FileInfo.pcwszFilePath = filename;
    WintrustData.pFile = &FileInfo;

    //
    // First verify the primary signature (index 0) to determine how many secondary signatures
    // are present. We use WSS_VERIFY_SPECIFIC and dwIndex to do this, also setting
    // WSS_GET_SECONDARY_SIG_COUNT to have the number of secondary signatures returned.
    //
    SignatureSettings.cbStruct = sizeof(WINTRUST_SIGNATURE_SETTINGS);
    SignatureSettings.dwFlags = WSS_GET_SECONDARY_SIG_COUNT | WSS_VERIFY_SPECIFIC;
    SignatureSettings.dwIndex = 0;
    WintrustData.pSignatureSettings = &SignatureSettings;

    if (UseStrongSigPolicy != false)
    {
        StrongSigPolicy.cbSize = sizeof(CERT_STRONG_SIGN_PARA);
        StrongSigPolicy.dwInfoChoice = CERT_STRONG_SIGN_OID_INFO_CHOICE;
        StrongSigPolicy.pszOID = szOID_CERT_STRONG_SIGN_OS_CURRENT;
        WintrustData.pSignatureSettings->pCryptoPolicy = &StrongSigPolicy;
    }
    BOOL bResult = E_NOT_SET;
    TRACE(L"Verifying primary signature... ");
    Error = WinVerifyTrust(NULL, &GenericActionId, &WintrustData);
    WintrustCalled = true;
    if (Error == ERROR_SUCCESS)
    {
        if (CheckCertificateIssuer(WintrustData.hWVTStateData, stValidIssuers))
        {
            if (bResult == E_NOT_SET)
                bResult = TRUE;
        }
        else
        {
            bResult = FALSE;
        }

        TRACE(L"Success!\n");

        TRACE(L"Found %d secondary signatures\n", WintrustData.pSignatureSettings->cSecondarySigs);

        // Now attempt to verify all secondary signatures that were found
        for (DWORD x = 1; x <= WintrustData.pSignatureSettings->cSecondarySigs; x++)
        {
            TRACE(L"Verify secondary signature at index %d... ", x);

            // Need to clear the previous state data from the last call to WinVerifyTrust
            WintrustData.dwStateAction = WTD_STATEACTION_CLOSE;
            Error = WinVerifyTrust(NULL, &GenericActionId, &WintrustData);
            if (Error != ERROR_SUCCESS)
            {
                //No need to call WinVerifyTrust again
                WintrustCalled = false;
                TRACE(L"%s", utils::error::getText(Error));
                ASSERT(FALSE);
                break;
            }

            WintrustData.hWVTStateData = NULL;

            // Caller must reset dwStateAction as it may have been changed during the last call
            WintrustData.dwStateAction = WTD_STATEACTION_VERIFY;
            WintrustData.pSignatureSettings->dwIndex = x;
            Error = WinVerifyTrust(NULL, &GenericActionId, &WintrustData);
            if (Error != ERROR_SUCCESS)
            {
                TRACE(L"%s", utils::error::getText(Error));
                ASSERT(FALSE);
                break;
            }

            if (CheckCertificateIssuer(WintrustData.hWVTStateData, stValidIssuers))
            {
                if (bResult == E_NOT_SET)
                    bResult = TRUE;
            }
            else
            {
                bResult = FALSE;
            }


            TRACE(L"Success!\n");
        }
    }
    else
    {
        TRACE(utils::error::getText(Error));
        ASSERT(FALSE);
    }

    //
    // Caller must call WinVerifyTrust with WTD_STATEACTION_CLOSE to free memory
    // allocate by WinVerifyTrust
    //
    if (WintrustCalled != false)
    {
        WintrustData.dwStateAction = WTD_STATEACTION_CLOSE;
        WinVerifyTrust(NULL, &GenericActionId, &WintrustData);
    }

    return bResult;

}
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Jim*_*myB 0

看着

The signature is timestamped: Sat Feb 11 14:03:12 2012
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和

Issued to: Microsoft Time-Stamp Service
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我假设第二个签名/证书用于时间戳文件。MS 很可能有两个不同的组织单位，其中一个对代码进行签名以确认其完整性，另一个（稍后）使用自己的证书再次对代码进行签名，专门用于为文件添加安全时间戳。

可以创建证书并将其分配给某些用途。打算用于时间戳的证书可以这样标记，因此signtool当它遇到时间戳证书时，有可能会给出错误，因为默认情况下它需要一个用于代码真实性/完整性验证的证书，而不是一个用于时间戳。

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