bsky.app
HTTPS & TLS
84/100B- TLS versionTLS 1.22/4
Negotiates TLS 1.2 at best; TLS 1.3 is faster and drops old ciphers.
- Old protocolsTLS 1.10/3
Still accepts TLS 1.1, retired by browsers in 2020 and open to downgrade attacks.
- HTTPS certificateAmazon10/10
HTTPS with a valid certificate from Amazon.
- Certificate expiry1224/4
The certificate is valid for another 122 days.
- Key strengthRSA 20482/2
A strong key: RSA 2048.
- HTTP → HTTPS3013/3
http:// redirects straight to https://.
- HSTS1 year4/4
HSTS tells browsers to use HTTPS only, for 1 year.
- HTTP/2 and HTTP/3HTTP/22/2
HTTP/2.
DNS
64/100D- DNSSEC0/3
Not signed with DNSSEC: a forged DNS answer for the domain cannot be told from the real one.
- CAA records0/2
No CAA records: any certificate authority may issue certificates for the domain.
- Name servers44/4
4 name servers for the domain.
- Name servers answer4/45/5
Every name server answers for the domain, with the same version of the zone.
- SPF?all1/5
SPF does not say what to do with other servers (?all neutral).
- MTA-STS0/2
No MTA-STS: mail to the domain can be read in transit by stripping its encryption.
- TLS reporting0/0.5
No TLS reporting: failed encrypted deliveries go unnoticed.
- DKIM
No DKIM key at the common selectors; it may use one that cannot be guessed.
- DMARCreject7/7
DMARC tells receivers to reject mail that fakes the domain (p=reject).
Web & network
50/100D- Content Security Policy0/3
No Content Security Policy: an injected script runs with the page's full rights.
- Referrer-Policy0/0.5
No Referrer-Policy of its own (browsers' default applies).
- Permissions-Policy0/0.5
No Permissions-Policy: embedded content may ask for camera, microphone or location.
- IPv60/4
bsky.app has no IPv6 address: IPv6-only networks reach it only through translation.
- X-Content-Type-Options2/2
X-Content-Type-Options: nosniff stops browsers guessing file types.
- Framing2/2
Other sites cannot frame its pages (clickjacking protection).
- RPKIvalid4/4
The route to the website is RPKI-valid: networks can reject hijacked announcements of it.
Dependencies
60/100D- DNS providersAmazon Route 533/5
All DNS is with one provider (Amazon Route 53): an outage there takes the domain offline, as Dyn's did in 2016.
- One company for everythingAmazon Web Services: website, DNS3/5
Amazon Web Services runs both the website and the DNS: one outage there takes both down.
Who runs it
- Website
- Amazon Web Services
- Google Workspace
Routes
- 3.136.0.0/13AS16509RPKI valid
Name servers
- ns-1425.awsdns-50.orgAmazon Route 53AS16509
- ns-2001.awsdns-58.co.ukAmazon Route 53AS16509
- ns-372.awsdns-46.comAmazon Route 53AS16509
- ns-757.awsdns-30.netAmazon Route 53AS16509
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What is graded
A valid certificate (an invalid one means F), its expiry against its lifetime, TLS 1.3, no TLS 1.0/1.1 (else at most B), http:// sent straight to https://, HSTS, HTTP/2.
At least two name servers that all answer and agree, DNSSEC, CAA records, and a registration that is not about to expire.
SPF, a DMARC policy that rejects forgeries (none means at most B), MTA-STS and TLS reporting for domains that take mail, DKIM at common selectors.
Content Security Policy, nosniff, framing protection, Referrer- and Permissions-Policy, IPv6, and an RPKI-valid route (invalid means at most C).
DNS from more than one provider, and the website, DNS and email not all with one company.
A+ 95–100 · A 85–94 · B 75–84 · C 65–74 · D 50–64 · F below 50