Infrastructure report cardTop 1K site

seznam.cz

76 out of 10016 passed9 to improve

Checked yesterday· Grading…

HTTPS & TLSA⁺

Certificate, protocol, redirect, HSTS100

DNSA⁺

Name servers, DNSSEC, CAA, registration100

EmailF

SPF, DMARC, MTA-STS, DKIM21

Web & networkC

Security headers, IPv6, RPKI72

DependenciesB

How much hangs on one company80

HTTPS & TLS

100/100A⁺

HTTPS certificateLet's Encrypt10/10
HTTPS with a valid certificate from Let's Encrypt.
Certificate expiry764/4
The certificate is valid for another 76 days.
TLS versionTLS 1.34/4
Negotiates TLS 1.3, the current protocol: faster handshakes, forward secrecy always.
Old protocols3/3
Refuses the retired TLS 1.0 and 1.1.
Key strengthRSA 40962/2
A strong key: RSA 4096.
HTTP → HTTPS3013/3
http:// redirects straight to https://.
HSTS2 years · preload4/4
HSTS tells browsers to use HTTPS only, for 2 years.
HTTP/2 and HTTP/3HTTP/22/2
HTTP/2.

DNS

100/100A⁺

Name servers24/4
2 name servers for the domain.
Name servers answer2/25/5
Every name server answers for the domain, with the same version of the zone.
DNSSECECDSAP256SHA2563/3
Signed with DNSSEC: resolvers can tell forged answers from real ones.
CAA recordsletsencrypt.org2/2
CAA records name the authorities allowed to issue its certificates.

Email

21/100F

SPF?all1/5
SPF does not say what to do with other servers (?all neutral).
DMARCnone2/7
DMARC only watches (p=none): mail that fakes the domain is still delivered.
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.

Web & network

72/100C

Content Security Policypartial1.5/3
A Content Security Policy is sent, but it does not limit scripts.
X-Content-Type-Options0/2
No X-Content-Type-Options: browsers may run an upload as a script.
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.
Framing2/2
Other sites cannot frame its pages (clickjacking protection).
IPv64/4
www.seznam.cz is reachable over IPv6 as well as IPv4.
RPKIvalid4/4
The route to the website is RPKI-valid: networks can reject hijacked announcements of it.

Dependencies

80/100B

DNS providersSelf-hosted3/5
All DNS is with one provider (Self-hosted): an outage there takes the domain offline, as Dyn's did in 2016.
One company for everything5/5
The website, DNS and email do not all hang on one company.

Who runs it

Website: SEZNAM
DNS: Self-hosted
Email: Self-hosted

Routes

77.75.76.0/23AS43037RPKI valid
2a02:598:a::/48AS43037RPKI valid

Name servers

ams.seznam.czSelf-hostedAS43037
ans.seznam.czSelf-hostedAS43037

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What is graded

HTTPS & TLS · 25%

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.

DNS · 20%

At least two name servers that all answer and agree, DNSSEC, CAA records, and a registration that is not about to expire.

Email · 20%

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.

Web & network · 20%

Content Security Policy, nosniff, framing protection, Referrer- and Permissions-Policy, IPv6, and an RPKI-valid route (invalid means at most C).

Dependencies · 15%

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