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c# ACME client (补充)

news 2025/11/9 0:04:55

上一篇 c# ACME client 漏了一部分内容，今天补上

除了之前介绍的在 asp.net core 使用方式，还可以单独在代码中使用client

简化用法

如果已经集成好完全的自动证书申请验证，就可以使用已经封装好的代码进行简单使用

举例在asp.net core提供一个api 可以根据参数申请证书

starup

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddAcmeChallengeCore(config: c =>
{c.HttpClientConfig = new VKProxy.Config.HttpClientConfig(){DangerousAcceptAnyServerCertificate = true};
});var app = builder.Build();if (app.Environment.IsDevelopment())
{app.MapOpenApi();
}
app.UseAuthorization();app.MapControllers();app.Run();

api

using Microsoft.AspNetCore.Mvc;
using VKProxy.ACME.AspNetCore;
using VKProxy.Core.Extensions;namespace WithApi.Controllers;[ApiController]
[Route("[controller]")]
public class CertController : ControllerBase
{private readonly IAcmeStateIniter initer;public CertController(IAcmeStateIniter initer){this.initer = initer;}[HttpGet]public async Task<string> Get([FromQuery] string domain){// 证书配置var o = new AcmeChallengeOptions(){AllowedChallengeTypes = VKProxy.ACME.AspNetCore.ChallengeType.Http01,Server = new Uri("https://127.0.0.1:14000/dir"),DomainNames = new[] { domain },AdditionalIssuers = new[] { """-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----"""}};// 申请全新account o.NewAccount(new string[] { "mailto:test11@xxx.com" });// 执行全套流程var cert = await initer.CreateCertificateAsync(o);return cert.ExportPem();}
}

默认情况下三种验证方式：

http

如在 asp.net core 中使用，默认已经添加了 app.Map("/.well-known/acme-challenge" 路由处理，如要申请公网上权威认证的证书，请将 /.well-known/acme-challenge 路由暴露在公网让acme服务器可以访问

其次由于默认实现没有持久化和分布式处理验证信息，重启和多实例都会有问题，如有需求可以替换IHttpChallengeResponseStore实现以达到效果

public interface IHttpChallengeResponseStore
{Task AddChallengeResponseAsync(string token, string keyAuth, CancellationToken cancellationToken);Task<string> GetChallengeResponse(string token, CancellationToken cancellationToken);Task RemoveChallengeResponseAsync(string token, CancellationToken cancellationToken);
}

dns

由于不同服务商有各自的api，所以默认没有实现，该功能其实无效，如需使用，请实现 IDnsChallengeStore

public interface IDnsChallengeStore
{Task AddTxtRecordAsync(string acmeDomain, string dnsTxt, CancellationToken cancellationToken);Task RemoveTxtRecordAsync(string acmeDomain, string dnsTxt, CancellationToken cancellationToken);
}

tls

个人并不推荐使用tls验证方式，其由于验证自签证书和正式证书都会在 tls 层，运行时不停机重新申请对于tls管理还是有些挑战的

如想尝试可以实现ITlsAlpnChallengeStore （默认在 asp.net core 的实现并不能支持过滤验证自签证书只用于acme服务器请求）

public interface ITlsAlpnChallengeStore
{Task AddChallengeAsync(string domainName, X509Certificate2 cert, CancellationToken cancellationToken);Task RemoveChallengeAsync(string domainName, X509Certificate2 cert, CancellationToken cancellationToken);
}

底层 client

如需直接使用原始 acme 协议client，可参考如下

starup

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();builder.Services.AddACME(c =>
{c.HttpClientConfig = new VKProxy.Config.HttpClientConfig(){DangerousAcceptAnyServerCertificate = true};
});

use

var context = services.BuildServiceProvider().GetRequiredService<IAcmeContext>();await context.InitAsync(new Uri("https://127.0.0.1:14000/dir"), cancellationToken);var account = await context.NewAccountAsync(new string[] { "mailto:xxx@xxx.com" }, true, KeyAlgorithm.RS256.NewKey());var order = await context.NewOrderAsync(new string[] { "test.com" });
var aus = order.GetAuthorizationsAsync().ToBlockingEnumerable().ToArray();
var a = aus.First();
var b = await a.HttpAsync();
var c = await b.ValidateAsync();Key privateKey = KeyAlgorithm.RS256.NewKey();
var csrInfo = new CsrInfo
{CommonName = "test.com",
};
order = await context.FinalizeAsync(csr, key, cancellationToken);
var acmeCert = await order.DownloadAsync();var pfxBuilder = acmeCert.ToPfx(privateKey);
if (!string.IsNullOrWhiteSpace(Args.AdditionalIssuer) && File.Exists(Args.AdditionalIssuer))
{pfxBuilder.AddIssuer(File.ReadAllBytes(Args.AdditionalIssuer));
}
var pfx = pfxBuilder.Build("HTTPS Cert - " + Args.Domain, string.Empty);
var r = X509CertificateLoader.LoadPkcs12(pfx, string.Empty, X509KeyStorageFlags.Exportable);