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Multi-Tenant SaaS's Wildcard TLS: An Overview of DNS-01 Challenges

a day ago
https://www.skeptrune.com/posts/wildcard-tls-for-multi-tenant-systems/
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  • #SaaS
  • #DevOps
  • #TLS
  • Multi-tenant SaaS platforms require wildcard TLS certificates for scalable subdomain provisioning.
  • Wildcard certificates (e.g., *.foo.com) cover all first-level subdomains but exclude apex domains and nested subdomains.
  • DNS-01 challenges are mandatory for wildcard certificates, verifying domain ownership via DNS TXT records.
  • Automating DNS-01 involves programmatic DNS API access to create and delete temporary TXT records.
  • Caddy with DNS provider plugins (e.g., Cloudflare, AWS Route53) simplifies wildcard certificate management.
  • Certificate provisioning includes DNS record creation, propagation checks, and automatic renewals.
  • Security considerations include token scope limiting, certificate revocation implications, and Public Suffix List registration for tenant isolation.
  • Wildcard certificates are ideal for tenant-id.foo.com architectures but unsuitable for custom domains or deep subdomain nesting.
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