动态PayPal按钮生成 - 是不是很不安全？

Question

我只是在想这里..不是PayPal按钮是动态创建的,非常不安全,而且很容易"hackable"？

像这样:

<form name="_xclick" target="paypal" action="https://www.paypal.com" method="post">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="business" value="me@mybusiness.com">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="item_name" value="HTML book">
<input type="hidden" name="amount" value="24.99">
<input type="image" src="http://www.paypal.com/en_US/i/btn/btn_cart_LG.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
<input type="hidden" name="add" value="1">
</form> 

当您可以使用FireBug修改代码时,可以直接更改产品的价格.

我问的原因是因为我可能/将会开始开发一个电子商务有点系统,在那里可以在该系统中添加产品,而无需在PayPal中进行.

Answer 1

您应该使用PayPal Button API,如下所示:

$sendPayData = array(
    "METHOD" => "BMCreateButton",
    "VERSION" => "65.2",
    "USER" => "username",
    "PWD" => "password",
    "SIGNATURE" => "abcdefg",
    "BUTTONCODE" => "ENCRYPTED",
    "BUTTONTYPE" => "BUYNOW",
    "BUTTONSUBTYPE" => "SERVICES",
    "BUTTONCOUNTRY" => "GB",
    "BUTTONIMAGE" => "reg",
    "BUYNOWTEXT" => "BUYNOW",
    "L_BUTTONVAR1" => "item_number=$invoiceNumber",
    "L_BUTTONVAR2" => "item_name=$invoiceType",
    "L_BUTTONVAR3" => "amount=$invoiceTotal",
    "L_BUTTONVAR4" => "currency_code=GBP",
    "L_BUTTONVAR5" => "no_shipping=1",
    "L_BUTTONVAR6" => "no_note=1",
    "L_BUTTONVAR7" => "notify_url=http://www.abc.co.uk/paypal/ipn.php",
    "L_BUTTONVAR8" => "cancel_return=http://www.abc.co.uk/paypal/thanks",
    "L_BUTTONVAR9" => "return=http://www.abc.co.uk/paypal/return.php"
);

然后,您可以使用cURL将其发送到他们的API

$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_URL, 'https://api-3t.paypal.com/nvp?'.http_build_query($sendPayData));
$nvpPayReturn = curl_exec($curl);
curl_close($curl);

然后生成无法编辑的加密HTML按钮

<form action="https://www.paypal.com/cgi-bin/webscr" method="post"> 
<input type="hidden" name="cmd" value="_s-xclick"> 
<input type="hidden" name="encrypted" value="-----BEGIN PKCS7-----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-----END PKCS7-----
">
<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_paynow_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online."> 
<img alt="" border="0" src="https://www.paypal.com/en_GB/i/scr/pixel.gif" width="1" height="1"> 

这些链接可以帮助您使用按钮选项:

https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_nvp_BMCreateButton

https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_api_ButtonMgrAPIIntro

Answer 2

你说得对 - 如果以明文形式传递产品的价格,动态的PayPal按钮很容易"破解".

但是,PayPal支持公钥按钮加密,因此无法轻易更改相关详细信息.这是它的工作方式:

• 您使用适当的程序(如OpenSSL)生成公钥/私钥对.
• 您登录到PayPal帐户并将公钥提交给PayPal,然后将私钥安全地存储在Web服务器上.您还需要下载PayPal的证书并将其存储在您的服务器上.强烈建议告诉PayPal不要接受未签名/未加密的交易(详情请见底部链接).
• 每次需要生成PayPal按钮时,使用PayPal的公钥加密数据并使用私钥对其进行签名,然后在网页上显示结果.当用户单击该按钮时,PayPal将解密详细信息并检查它们是否在您的服务器上生成后未被篡改.

这样,只要您的私钥不妥协,任何人都无法改变交易的详细信息.

有关详细信息和详细说明,请访问https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_html_encryptedwebpayments#id08A3I0P017Q.(虽然PayPal提供了生成加密按钮的软件,但我认为可以使用适当的功能"动态"创建它们,例如openssl_*()在PHP中;我没有亲自测试过它们.

另一种方法是实施即时付款通知(https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_admin_IPNIntro); 您可以检查用户执行的交易金额是否等于总订单金额.