在使用App Service服务部署业务应用,因为有些第三方的接口需要调用者携带TLS/SSL证书(X509 Certificate),在官方文档中介绍了两种方式在代码中使用证书:
1) 直接使用证书文件路径加载证书
2) 从系统的证书库中通过指纹加载证书
本文中,将分别通过代码来验证以上两种方式.
第一步:使用PowerShell创建自签名证书
参考文档 : 生成自签名证书概述 https://learn.microsoft.com/zh-cn/dotnet/core/additional-tools/self-signed-certificates-guide#with-powershell
$cert = New-SelfSignedCertificate -DnsName @("mytest.com", "www.mytest.com") -CertStoreLocation "cert:\LocalMachine\My"
$certKeyPath = 'C:\MyWorkPlace\Tools\scerts\mytest.com.pfx'
$password = ConvertTo-SecureString 'password' -AsPlainText -Force
$cert | Export-PfxCertificate -FilePath $certKeyPath -Password $password
$rootCert = $(Import-PfxCertificate -FilePath $certKeyPath -CertStoreLocation 'Cert:\LocalMachine\Root' -Password $password)
注意:
- 需要使用Administrator模式打开PowerShell窗口
- DnsName, CertKeyPath和 password的内容都可根据需求进行调整
第二步:准备两种读取证书的 .NET代码
方式一:通过证书文件名和密码读取加载证书
public static string LoadPfx(string? filename, string password = "")
{
try
{
if (filename == null) filename = "contoso.com.pfx";
var bytes = File.ReadAllBytes(filename);
var cert = new X509Certificate2(bytes, password);
return cert.ToString();
}
catch (Exception ex)
{
return ex.Message;
}
}
方式二:通过指纹在系统证书库中查找证书
public static string FindPfx(string certThumbprint = "")
{
try
{
bool validOnly = false;
using (X509Store certStore = new X509Store(StoreName.My, StoreLocation.CurrentUser))
{
certStore.Open(OpenFlags.ReadOnly);
X509Certificate2Collection certCollection = certStore.Certificates.Find(
X509FindType.FindByThumbprint,
// Replace below with your certificate's thumbprint
certThumbprint,
validOnly);
// Get the first cert with the thumbprint
X509Certificate2 cert = certCollection.OfType<X509Certificate2>().FirstOrDefault();
if (cert is null)
throw new Exception($"Certificate with thumbprint {certThumbprint} was not found");
return cert.ToString();
}
}
catch (Exception ex) { return ex.Message; }
}
在本次实验中,通过API来调用以上 LoadPfx 和 FindPfx 方法
第三步:发布测试应用到Azure App Service
第四步:测试接口并修复问题
通过文件方式读取证书内容,测试成功
但是,通过指纹查找的时候,却返回无法找到证书。
Certificate with thumbprint 5A1E7923F5638549F4BA3E29EEDBBDCB2E9B572E was not found
这是原因有两种:
1)证书没有添加到App Service的Certificates中。
2)需要在App Service的Configuration中添加配置WEBSITE_LOAD_CERTIFICATES参数,值为 * 或者是固定的 证书指纹值。
检查以上两点原因后,再次通过指纹方式查找证书。成功!
示例代码
1 using Microsoft.AspNetCore.Mvc;
2 using System.Security.Cryptography.X509Certificates;
3
4 var builder = WebApplication.CreateBuilder(args);
5
6 // Add services to the container.
7
8 var app = builder.Build();
9
10 // Configure the HTTP request pipeline.
11
12 app.UseHttpsRedirection();
13
14
15 app.MapGet("/loadpfxbyname", ([FromQuery(Name = "name")] string filename, [FromQuery(Name = "pwd")] string pwd) =>
16 {
17 var content = pfxTesting.LoadPfx(filename, pwd);
18 return content;
19 });
20
21 app.MapGet("/loadpfx/{pwd}", (string pwd) =>
22 {
23
24 var content = pfxTesting.LoadPfx(null, pwd);
25 return content;
26 });
27
28 app.MapGet("/findpfx/{certThumbprint}", (string certThumbprint) =>
29 {
30
31 var content = pfxTesting.FindPfx(certThumbprint);
32 return content;
33 });
34
35 app.Run();
36
37 class pfxTesting
38 {
39 public static string LoadPfx(string? filename, string password = "")
40 {
41 try
42 {
43 if (filename == null) filename = "contoso.com.pfx";
44
45 var bytes = File.ReadAllBytes(filename);
46 var cert = new X509Certificate2(bytes, password);
47
48 return cert.ToString();
49 }
50 catch (Exception ex)
51 {
52 return ex.Message;
53 }
54 }
55
56 public static string FindPfx(string certThumbprint = "")
57 {
58 try
59 {
60 bool validOnly = false;
61 using (X509Store certStore = new X509Store(StoreName.My, StoreLocation.CurrentUser))
62 {
63 certStore.Open(OpenFlags.ReadOnly);
64
65 X509Certificate2Collection certCollection = certStore.Certificates.Find(
66 X509FindType.FindByThumbprint,
67 // Replace below with your certificate's thumbprint
68 certThumbprint,
69 validOnly);
70 // Get the first cert with the thumbprint
71 X509Certificate2 cert = certCollection.OfType<X509Certificate2>().FirstOrDefault();
72
73 if (cert is null)
74 throw new Exception($"Certificate with thumbprint {certThumbprint} was not found");
75
76 return cert.ToString();
77
78 }
79 }
80 catch (Exception ex) { return ex.Message; }
81 }
82 }
参考资料
在 Azure 应用服务中通过代码使用 TLS/SSL 证书 : https://docs.azure.cn/zh-cn/app-service/configure-ssl-certificate-in-code#load-certificate-from-file
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