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php - 在 ColdFusion 中从 Microsoft Teams 自定义 Bot 验证 HMAC

问题描述

我正在尝试按照 C# 中的 Microsoft 说明使用 ColdFusion 对 Microsoft Teams 自定义 Bot 进行身份验证。我也尝试按照这个 PHP 示例进行操作。但我没有任何运气。知道我在这里缺少什么吗？

<cfset secretKey       = "MsVx7SpJKnSiycvsUyLMiD8lDIFkEUDhuYuFAT94hXY=">
<cfset httpRequestData = GetHttpRequestData()>
<cfset c               = httpRequestData.content>
<cfset calculated_hmac = toBase64(hmac(c, secretKey, "HMACSHA256"))>

我得到这个...

calculated_hmac: NjE2RUY1RjREQTNEMzk1Q0RBNUJDMEE2NDhFNzk3RDIyNUMzRDJDMjk5NTYzMDgxODk0NkU3Njc3RTVEQTAyQQ==

虽然来自 Microsoft 的 headers.authorization 是这样的......

HMAC 6N0WyOW7g+LqShKYsouWOrPjgh0PD1gazfwNeNwpuS8=

对于这个具体的例子GetHttpRequestData().content是...

{"type":"message","id":"1552059974228","timestamp":"2019-03-08T15:46:14.225Z","localTimestamp":"2019-03-08T09:46:14.225-06 :00","serviceUrl":" https://smba.trafficmanager.net/amer/","channelId":"msteams","from":{"id":"29:1lY_4faAJwr1qSsIBSpFnI3nYpy3wv5hLp5qZk1_uuc_3ET_aW1Ttu_vN-evUZ0TXVKIBoy8wEBzPT7a1WgwOTQ","name":"Gordon Frobenius","aadObjectId":"be3510a6-204d-4b3f-b6c3-52bbddb303d5 "},"conversation":{"isGroup":true,"id":"19:a69ef3b3162a43018edb05db74138636@thread.skype;messageid=1552059031619","name":null,"conversationType":"channel"},"recipient" :null,"textFormat":"plain","attachmentLayout":null,"membersAdded":[],"membersRemoved":[],"topicName":null,"historyDisclosed":null,"locale":"en- US","text":"cmpro 机器人帮助\n","speak":null,"inputHint":null,"summary":null,"suggestedActions":null,"attachments":[{"contentType":"text/html","contentUrl":null,"content":"http://schema .skype.com/Mention\" itemid=\"0\">cmpro 机器人帮助\n","name":null,"thumbnailUrl":null}],"entities":[{"type":"clientInfo" ,"locale":"en-US","country":"US","platform":"Windows"}],"channelData":{"teamsChannelId":"19:a69ef3b3162a43018edb05db74138636@thread.skype","teamsTeamId ":"19:a69ef3b3162a43018edb05db74138636@thread.skype","channel":{"id":"19:a69ef3b3162a43018edb05db74138636@thread.skype"},"team":{"id":"19:a69ef3b3162a43018edb05db74138636@thread.skype"},"租户":{"id":"0d78b7c2-75c2-4dad-966d-500250225e13"}},"action":null,"replyToId":null,"值":null,"name":null,"relatesTo":null,"code":null}

标签： phpcoldfusionchatbothmacmicrosoft-teams

解决方案

（注意，我无法重现那个“calculated_hmac”，因为示例“content”字符串必须在某种程度上与原始字符串不同 - 可能只是空格，但这足以完全改变结果......）。

无论如何，根据说明，我猜主要问题是在散列中使用字符串而不是二进制：

  1. 从消息的请求正文生成 hmac.... 您需要将正文转换为 UTF8 格式的字节数组。
  2. 若要计算哈希，请提供Microsoft Teams 在您注册传出 webhook 时提供的安全令牌的字节数组。

首先尝试将正文解码为二进制

<cfset bodyBinary = charsetDecode(GetHttpRequestData().content, "utf-8")>

对密钥执行相同操作

<cfset secretKey  = "MsVx7SpJKnSiycvsUyLMiD8lDIFkEUDhuYuFAT94hXY=">
<cfset secretBinary = binaryDecode(secretKey, "base64")>

最后，不要忘记 HMAC() 返回一个十六进制字符串。如果你需要base64，你必须自己动手：

<cfset hexHash = hmac(bodyBinary, secretBinary, "HMACSHA256")>
<cfset calculated_hmac = binaryEncode(binaryDecode(hexHash, "hex"), "base64")>

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