private void Init()
{
if (File.Exists(_opts.CaKeyPairSavePath))
{
using (var fs = new FileStream(_opts.CaKeyPairSavePath, FileMode.Open))
{
_keyPair = PkiKeyPair.Load(fs);
}
}
if (_keyPair == null)
{
switch (_opts.KeyPairAlgorithm)
{
case PkiAsymmetricAlgorithm.Rsa:
_keyPair = PkiKeyPair.GenerateRsaKeyPair(_opts.BitLength ?? 2048);
break;
case PkiAsymmetricAlgorithm.Ecdsa:
_keyPair = PkiKeyPair.GenerateEcdsaKeyPair(_opts.BitLength ?? 256);
break;
default:
throw new Exception("unsupported Key Pair Algorithm");
}
using (var fs = new FileStream(_opts.CaKeyPairSavePath, FileMode.CreateNew))
{
_keyPair.Save(fs);
}
}
if (File.Exists(_opts.CaCertificateSavePath))
{
using (var fs = new FileStream(_opts.CaCertificateSavePath, FileMode.Open))
{
CaCertificate = PkiCertificate.Load(fs);
}
}
if (CaCertificate == null)
{
var caCsr = new PkiCertificateSigningRequest(
_opts.CaSubjectName, _keyPair, _opts.SignatureHashAlgorithm);
CaCertificate = caCsr.CreateCa(
DateTimeOffset.Now.ToUniversalTime(),
DateTimeOffset.Now.AddYears(10).ToUniversalTime());
using (var fs = new FileStream(_opts.CaCertificateSavePath, FileMode.CreateNew))
{
CaCertificate.Save(fs);
}
}
}
public void SaveLoadCertificate(PkiAsymmetricAlgorithm algor, int bits)
{
var hashAlgor = PkiHashAlgorithm.Sha256;
var isurName = "CN=SelfSigned";
var isurKeys = PkiKeyTests.GenerateKeyPair(algor, bits);
var subjName = "CN=foo.example.com";
var subjKeys = PkiKeyTests.GenerateKeyPair(algor, bits);
var isurCsr = new PkiCertificateSigningRequest(isurName, isurKeys, hashAlgor);
var subjCsr = new PkiCertificateSigningRequest(subjName, subjKeys, hashAlgor);
subjCsr.CertificateExtensions.Add(PkiCertificateExtension.CreateDnsSubjectAlternativeNames(
new[] {
"foo-alt1.example.com",
"foo-alt2.example.com",
}
));
var selfOut = Path.Combine(_testTemp,
$"certsave-{algor}-{bits}-{hashAlgor}-self.ser");
var signedOut = Path.Combine(_testTemp,
$"certsave-{algor}-{bits}-{hashAlgor}-signed.ser");
var isurCert = isurCsr.CreateCa(
DateTime.Now.AddMonths(-5),
DateTime.Now.AddMonths(5));
var subjCert = subjCsr.Create(isurCert, isurKeys.PrivateKey,
DateTime.Now.AddMonths(-1),
DateTime.Now.AddMonths(1), new[] { (byte)0x2b });
using (var ms = new MemoryStream())
{
isurCert.Save(ms);
File.WriteAllBytes(selfOut, ms.ToArray());
}
using (var ms = new MemoryStream())
{
subjCert.Save(ms);
File.WriteAllBytes(signedOut, ms.ToArray());
}
PkiCertificate isurCert2;
PkiCertificate subjCert2;
using (var fs = new FileStream(selfOut, FileMode.Open))
isurCert2 = PkiCertificate.Load(fs);
using (var fs = new FileStream(signedOut, FileMode.Open))
subjCert2 = PkiCertificate.Load(fs);
var bclIsur = isurCert.ToBclCertificate();
var bclSubj = subjCert.ToBclCertificate();
var bclIsur2 = isurCert2.ToBclCertificate();
var bclSubj2 = subjCert2.ToBclCertificate();
Assert.AreEqual(bclIsur.GetSerialNumberString(),
bclIsur2.GetSerialNumberString(), "Issuer Serial Number");
Assert.AreEqual(bclIsur.GetCertHashString(),
bclIsur2.GetCertHashString(), "Issuer Hash");
Assert.AreEqual(bclIsur.GetRawCertDataString(),
bclIsur2.GetRawCertDataString(), "Issuer Raw Data");
Assert.AreEqual(bclSubj.GetSerialNumberString(),
bclSubj2.GetSerialNumberString(), "Subject Serial Number");
Assert.AreEqual(bclSubj.GetCertHashString(),
bclSubj2.GetCertHashString(), "Subject Hash");
Assert.AreEqual(bclSubj.GetRawCertDataString(),
bclSubj2.GetRawCertDataString(), "Subject Raw Data");
}
public async Task <IActionResult> Post([FromBody] DomainRequest request)
{
if (!IsValidDomain(request.Domain))
{
return(BadRequest(new DomainResponse {
Error = "Invalid domain"
}));
}
var domain = string.Join(".", request.Domain.Split(".").TakeLast(2));
var subDomain = string.Join(".", request.Domain.Split(".").SkipLast(2));
var credentials = new AzureCredentialsFactory()
.FromServicePrincipal(
_configuration["Azure:ClientId"],
_configuration["Azure:ClientSecret"],
_configuration["Azure:TenantId"],
AzureEnvironment.AzureGlobalCloud
);
var azure = Azure
.Configure()
.WithRetryPolicy(new RetryPolicy(new TransientErrorIgnoreStrategy(), 0))
.Authenticate(credentials)
.WithSubscription(_configuration["Azure:SubscriptionId"]);
var webApp = await azure.AppServices.WebApps.GetByIdAsync(
_configuration["Azure:AppId"]);
try
{
webApp.Update()
.DefineHostnameBinding()
.WithThirdPartyDomain(domain)
.WithSubDomain(subDomain)
.WithDnsRecordType(CustomHostNameDnsRecordType.CName)
.Attach()
.Apply();
}
catch (Exception e)
{
return(BadRequest(new DomainResponse {
Error = "Unable to validate domain ownership"
}));
}
_ = Task.Run(async() =>
{
using var airtableBase = new AirtableBase(_configuration["Airtable:Key"], _configuration["Airtable:Base"]);
try
{
HttpClient httpClient = new HttpClient {
BaseAddress = new Uri(_configuration["Acme:Endpoint"])
};
AcmeProtocolClient acme = new AcmeProtocolClient(httpClient, usePostAsGet: true);
var acmeDir = await acme.GetDirectoryAsync();
acme.Directory = acmeDir;
await acme.GetNonceAsync();
var account = await acme.CreateAccountAsync(new[] { "mailto:" + _configuration["Acme:Email"] }, true);
acme.Account = account;
var order = await acme.CreateOrderAsync(new[] { request.Domain });
if (order.Payload.Status == "invalid")
{
return;
}
var authorizationUrl = order.Payload.Authorizations.FirstOrDefault();
if (string.IsNullOrEmpty(authorizationUrl))
{
return;
}
var authorization = await acme.GetAuthorizationDetailsAsync(authorizationUrl);
foreach (var challenge in authorization.Challenges.Where(x => x.Type == "http-01").ToList())
{
var challengeValidationDetails = (Http01ChallengeValidationDetails)
AuthorizationDecoder.DecodeChallengeValidation(authorization, challenge.Type, acme.Signer);
var path = challengeValidationDetails.HttpResourcePath;
var token = path.Split("/", StringSplitOptions.RemoveEmptyEntries).Last();
var value = challengeValidationDetails.HttpResourceValue;
var contentType = challengeValidationDetails.HttpResourceContentType;
await airtableBase.CreateRecord("Acme", new Fields
{
FieldsCollection = new Dictionary <string, object>
{
["Token"] = token,
["Value"] = value,
["ContentType"] = contentType
}
});
await Task.Delay(10 * 1000);
var challengeUpdated = await acme.AnswerChallengeAsync(challenge.Url);
}
//Wait for challenge to be resolved
var waitUntil = DateTime.Now.AddSeconds(300);
Authorization authorizationUpdated;
do
{
await Task.Delay(10 * 1000);
authorizationUpdated = await acme.GetAuthorizationDetailsAsync(authorizationUrl);
} while (authorizationUpdated.Status != "valid" && DateTime.Now < waitUntil);
if (authorizationUpdated.Status != "valid")
{
return;
}
//Generate certificate private key and CSR (Certificate signing request)
var keyPair = PkiKeyPair.GenerateEcdsaKeyPair(256);
var csr = new PkiCertificateSigningRequest($"CN={request.Domain}", keyPair, PkiHashAlgorithm.Sha256);
var certCsr = csr.ExportSigningRequest(PkiEncodingFormat.Der);
order = await acme.FinalizeOrderAsync(order.Payload.Finalize, certCsr);
if (order.Payload.Status != "valid")
{
return;
}
if (string.IsNullOrEmpty(order.Payload.Certificate))
{
//Wait for certificate
var waitUntil2 = DateTime.Now.AddSeconds(300);
while (DateTime.Now < waitUntil2)
{
await Task.Delay(10 * 1000);
order = await acme.GetOrderDetailsAsync(order.OrderUrl, existing: order);
if (!string.IsNullOrEmpty(order.Payload.Certificate))
{
break;
}
}
}
if (string.IsNullOrEmpty(order.Payload.Certificate))
{
return;
}
var certResp = await acme.GetAsync(order.Payload.Certificate);
if (!certResp.IsSuccessStatusCode)
{
return;
}
var certByteArray = await certResp.Content.ReadAsByteArrayAsync();
//Export PFX file
var pfxPassword = _configuration["Acme:PfxPassword"];
var privateKey = keyPair.PrivateKey;
using var cert = new X509Certificate2(certByteArray);
X509Chain chain = new X509Chain();
chain.Build(cert);
List <PkiCertificate> chainList = new List <PkiCertificate>();
foreach (var e in chain.ChainElements)
{
chainList.Add(PkiCertificate.From(e.Certificate));
}
var pfx = chainList[0].Export(PkiArchiveFormat.Pkcs12,
chain: chainList.Skip(1),
privateKey: privateKey,
password: pfxPassword?.ToCharArray());
webApp.Update()
.DefineSslBinding()
.ForHostname(request.Domain)
.WithPfxByteArrayToUpload(pfx, pfxPassword)
.WithSniBasedSsl()
.Attach()
.Apply();
}
catch (Exception e)
{
await airtableBase.CreateRecord("Logs", new Fields
{
FieldsCollection = new Dictionary <string, object>
{
["Hostname"] = request.Domain,
["Event"] = "exception-thrown",
["Data"] = JsonConvert.SerializeObject(e)
}
});
}
});
return(Ok(new DomainResponse {
IsSuccessful = true
}));
}