c# ACME client (补充)

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----- MIIDGzCCAgOgAwIBAgIIUPFry5qBu34wDQYJKoZIhvcNAQELBQAwIDEeMBwGA1UE AxMVUGViYmxlIFJvb3QgQ0EgMjFjNjY3MCAXDTI1MDcyMjAxMTA0OVoYDzIwNTUw NzIyMDExMDQ5WjAgMR4wHAYDVQQDExVQZWJibGUgUm9vdCBDQSAyMWM2NjcwggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCxNKa4y93OFYaSx8bcbuWsHHnW mpfsobK5Elf7GE02mi/cDrMP+wR1l53BuucrW04OyoewkBsJNZoxEy1DkCjxv4+g Q+HgGCR5R14ex17ZdFxpcl42H8QnRB3IqVBlJiz0JyGZwiaOamOkUTVEYTGDeuxu PglpvboGeatsWQe0MJJfBN8OxLVUmi6Y/enbzlIdv3tvgQujfPNiS8MLDMBuIiMs ixhu8YAzUqvVKZoQVK7GwbD9WrVBKub8w86StKFmU14aSXahidt8IENdpLO2OT3J y1nt25QDsAmtS1/wGnTDPeefLGsM7kGYNesQkSW0w8Um4p9KLWKnKyOvzPZrAgMB AAGjVzBVMA4GA1UdDwEB/wQEAwIChDATBgNVHSUEDDAKBggrBgEFBQcDATAPBgNV HRMBAf8EBTADAQH/MB0GA1UdDgQWBBRoXcwo6c5J8jMweiHKPw4OlcWIQzANBgkq hkiG9w0BAQsFAAOCAQEAad9XT4sN1KserYtCxBKmoPhPAHInHYgG/Z2gd6KqdsK9 biIgEbKo84tClLqA6XCN/yN1bMQL2ZMbWBF8oHv/A5o0atpTpd+Ho+punHYRIpqv akUX21Zsu6NdAuH7g7m9t9h/lc6tgiqaAf2HwpC3NrXmUlPRqLay7/t+BFQU6dBa E+qzmL7lHZQf1UArfb+QDYH2XsFCk9Pjv0xdP+PGwf8HqHhfPLctvus5JL+LXp0X 68eWKQCs1CrL8cUMwcELlW/mR1lKnJL1WgM1Bns9ZF1ha6egG539ruzQjItF6MHB xAEt55nXfs+mjV1p7qrcmR8jIdByR9C36T21r+8pKA== -----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);