问题描述
在之前博文中介绍使用System Managed Identity 执行APIM备份到Storage Account的操作时，突然遇见了 Authentication Failed，详细的错误信息显示证书过期。
{
"error": {
"code": "BadRequest",
"message": "Authentication Failed : A configuration issue is preventing authentication - check the error message from the server for details.
You can modify the configuration in the application registration portal. See https://aka.ms/msal-net-invalid-client for details.
Original exception: AADSTS700027: The certificate with identifier used to sign the client assertion is expired on application.
[Reason - The key used is expired.,Thumbprint of key used by client: '3D****************', Found key 'Start=04/28/2024 11:10:00, End=07/28/2024 11:10:00',
Please visit the Azure Portal, Graph Explorer or directly use MS Graph to see configured keys for app Id 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'.
Review the documentation at https://docs.microsoft.com/en-us/graph/deployments to determine the corresponding service endpoint and https://docs.microsoft.com/en-us/graph/api/application-get?view=graph-rest-1.0&tabs=http to build a query request URL, such as ' https://microsoftgraph.chinacloudapi.cn/beta/applications/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'].
Trace ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Correlation ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Timestamp: 2024-07-29 10:16:32Z ",
"details": null,
"innerError": null
}
}
但是，APIM中被没有证书啊？这个报错从何而来呢？
问题解答
根据错误信息中的App ID，在Azure Entira ID服务中，找到它 ：这是APIM所启用的 Systemd Identity的企业注册ID。
只是。这个证书信息通过门户无法查看。
但是，通过AZ CLI指令(az ad sp show --id)可以查看到，如：
根据以上提示，是否想到可以直接通过命令来重置证书呢？ 测试发现，因为这个SP是由APIM生成的System Managed Identity，尽管当前登录账号是资源的Owner，也是无权重置Credentials。
PS C:\> az ad sp credential reset --id xx-x-x-x-xxx --create-cert
Insufficient privileges to complete the operation.
后面，为了快速的实现APIM的备份操作成功，就通过先关闭APIM的Managed Identity，然后开启的方式重新生成一个ID，之后，证书过期问题得到解决。
请注意：操作时需要非常小心，因为它会改变当前APIM访问其它Azure资源的标识，旧的ID消失后，新ID的权限需要重新配置。
参考资料
调用APIM的备份接口时候遇见InvalidParameters错误 : https://www.cnblogs.com/lulight/p/18326145
az ad sp show : https://learn.microsoft.com/en-us/cli/azure/ad/sp?view=azure-cli-latest#az-ad-sp-show
