Ovaj scenarij opisuje kreiranje CSR-a s više Subject Alternative Names (SAN). Ovo je potrebno za certifikate koji trebaju osigurati više domena, poddomena ili IP adresa.

Slučajevi uporabe:

• Multi-domain certifikati (SAN certifikati)
• Wildcard + eksplicitne domene kombinirano
• Interna + eksterna imena
• Load balancer s više backenda

using WvdS.Security.Cryptography.X509Certificates.Extensions.PQ;
 
using var ctx = PqCryptoContext.Initialize();
using var key = ctx.GenerateKeyPair(PqAlgorithm.MlDsa65);
 
var dn = new DnBuilder()
    .AddCN("example.com")  // Primarna domena
    .AddO("Example d.o.o.")
    .AddC("HR")
    .Build();
 
// Multi-SAN s različitim tipovima
var extensions = new ExtBuilder()
    .SubjectAlternativeName(new[] {
        // DNS imena
        "dns:example.com",
        "dns:www.example.com",
        "dns:api.example.com",
        "dns:app.example.com",
        "dns:*.dev.example.com",      // Wildcard za dev
 
        // IP adrese (za interne pristupe)
        "ip:10.0.0.100",
        "ip:192.168.1.50",
 
        // IPv6
        "ip:2001:db8::1"
    })
    .KeyUsage(KeyUsageFlags.DigitalSignature | KeyUsageFlags.KeyEncipherment)
    .ExtendedKeyUsage(ExtKeyUsage.ServerAuth)
    .Build();
 
var csr = ctx.CreateCertificateRequest(key, dn, extensions);
 
// Ispis svih SAN-ova
Console.WriteLine("Subject Alternative Names:");
foreach (var san in csr.SubjectAlternativeNames)
{
    Console.WriteLine($"  - {san}");
}
 
File.WriteAllText("multi-san.csr.pem", csr.ToPem());

var extensions = new ExtBuilder()
    .SubjectAlternativeName(new[] {
        "dns:example.com",           // Root domena (wildcard ovo ne pokriva!)
        "dns:*.example.com",         // Sve poddomene 1. razine
        "dns:*.api.example.com",     // API poddomene
        "dns:legacy.old-domain.com"  // Alternativna domena
    })
    .Build();

var extensions = new ExtBuilder()
    .SubjectAlternativeName(new[] {
        // Kubernetes Service DNS
        "dns:my-service",
        "dns:my-service.default",
        "dns:my-service.default.svc",
        "dns:my-service.default.svc.cluster.local",
 
        // Headless Service (Pod DNS)
        "dns:*.my-service.default.svc.cluster.local",
 
        // Eksterna Ingress domena
        "dns:api.example.com"
    })
    .Build();

« ← 2.2 Klijentski CSR | ↑ Pregled CSR | 2.4 Obrada CSR → »

Wolfgang van der Stille @ EMSR DATA d.o.o. - Post-Quantum Cryptography Professional