gitlab.com

An authorized sender list is defined; mail from other servers is flagged as suspicious.

~all (softfail) — acceptable when combined with enforced DMARC. 1 of 10 DNS lookups.

v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all

$ dig +short TXT gitlab.com

Forged email in the company's name is blocked by mail servers.

Policy p=reject.

v=DMARC1; p=reject; pct=100; rua=mailto:dmarc_agg@vali.email;

$ dig +short TXT _dmarc.gitlab.com

A DKIM public key is published. On its own this doesn't prove outgoing mail is signed or aligned with your From domain.

DKIM public key found for selector: google, k1, mail. Confirm signing with dkim=pass in a sent message's Authentication-Results.

google._domainkey: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCA5+ebKcaMAURa2i9I+RHKoGlcO+/bd3tr…
k1._domainkey: k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i8…
mail._domainkey: v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDQSga8sIidjqKTlTWBfV6KoUvJm7InbqtfNX…

$ dig +short TXT google._domainkey.gitlab.com

Mail exchangers are published for the domain.

5 MX record(s). This shows where inbound mail is routed, not whether mail is sent from the domain.

1 aspmx.l.google.com
10 alt3.aspmx.l.google.com
10 alt4.aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com

$ dig +short MX gitlab.com

The site loads over an encrypted connection.

https://gitlab.com/ returned HTTP 200 (final URL: https://about.gitlab.com/). Client-side certificate validation passed.

HTTP 200
Final URL: https://about.gitlab.com/

$ curl -sIL https://gitlab.com/

Visitors arriving at an unencrypted address are automatically sent to the secure version.

HTTP 301 → https://gitlab.com/

HTTP 301
Location: https://gitlab.com/

$ curl -sI http://gitlab.com/ | grep -iE "^(HTTP|location)"

The certificate was accepted by a validating TLS client at scan time.

Live TLS handshake succeeded. Latest issuance in CT logs: Sectigo, expiring 2027-05-12 (178 days). CT shows issued certificates, not necessarily the one served — confirm dates with the verify command.

Live TLS handshake: certificate accepted
CT logs (context only, not scored):
Issuer: Sectigo
Valid from: 2026-10-26
Valid until: 2027-05-12
Names: auth.gitlab.com, customers.gitlab.com, email.customers.gitlab.com, gitlab.com, gprd.gitlab.com, www.gitlab.com
Based on Certificate Transparency logs; may not reflect the certificate currently served.

$ echo | openssl s_client -connect gitlab.com:443 -servername gitlab.com 2>/dev/null | openssl x509 -noout -issuer -dates

Browsers are told to always use an encrypted connection to the site.

max-age=31536000 (365 days), no includeSubDomains. ≥ 180 days recommended.

Strict-Transport-Security: max-age=31536000

$ curl -sIL https://gitlab.com/ | grep -i "Strict-Transport-Security"

Missing Content-Security-Policy header: this removes one layer of protection against script injection.

No Content-Security-Policy header found.

Content-Security-Policy: (missing)

$ curl -sIL https://gitlab.com/ | grep -i "Content-Security-Policy"

/*
  Content-Security-Policy-Report-Only: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'

Missing X-Frame-Options / frame-ancestors: this removes one layer of protection against clickjacking.

No valid X-Frame-Options and no frame-ancestors in the CSP.

X-Frame-Options: (missing)

$ curl -sIL https://gitlab.com/ | grep -i "X-Frame-Options"

/*
  X-Frame-Options: SAMEORIGIN

The browser may interpret files as code unintentionally.

Missing X-Content-Type-Options: nosniff header (MIME sniffing).

X-Content-Type-Options: (missing)

$ curl -sIL https://gitlab.com/ | grep -i "X-Content-Type-Options"

/*
  X-Content-Type-Options: nosniff

Internal URLs (including parameters) may leak to external sites.

Referrer-Policy is missing; the browser will use its default.

Referrer-Policy: (missing)

$ curl -sIL https://gitlab.com/ | grep -i "Referrer-Policy"

/*
  Referrer-Policy: strict-origin-when-cross-origin

Access to sensitive features like the camera and location isn't restricted.

Missing Permissions-Policy header.

Permissions-Policy: (missing)

$ curl -sIL https://gitlab.com/ | grep -i "Permissions-Policy"

/*
  Permissions-Policy: camera=(), microphone=(), geolocation=()

The server doesn't disclose software versions.

No version numbers found in the Server / X-Powered-By headers.

server: cloudflare
x-powered-by: (missing)

$ curl -sIL https://gitlab.com/ | grep -iE "^(server|x-powered-by)"

The domain's records aren't signed, so in some scenarios users could be redirected to a forged server.

No DS record is published at the parent zone, so there's no DNSSEC chain of trust for this zone.

AD = false
DS gitlab.com: NODATA

$ dig +short DS gitlab.com

dig +dnssec gitlab.com SOA
delv gitlab.com

Only authorized certificate authorities can issue certificates for the domain.

CAA records: 0 iodef "mailto:security@gitlab.com" | 0 issue "amazon.com" | 0 issue "amazonaws.com" | 0 issue "amazontrust.com" | 0 issue "awstrust.com" | 0 issue "comodoca.com" | 0 issue "digicert.com; cansignhttpexchanges=yes" | 0 issue "globalsign.com" | 0 issue "letsencrypt.org" | 0 issue "pki.goog; cansignhttpexchanges=yes" | 0 issue "sectigo.com" | 0 issue "ssl.com" | 0 issuewild "comodoca.com" | 0 issuewild "digicert.com; cansignhttpexchanges=yes" | 0 issuewild "letsencrypt.org" | 0 issuewild "pki.goog; cansignhttpexchanges=yes" | 0 issuewild "ssl.com"

0 iodef "mailto:security@gitlab.com"
0 issue "amazon.com"
0 issue "amazonaws.com"
0 issue "amazontrust.com"
0 issue "awstrust.com"
0 issue "comodoca.com"
0 issue "digicert.com; cansignhttpexchanges=yes"
0 issue "globalsign.com"
0 issue "letsencrypt.org"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issue "sectigo.com"
0 issue "ssl.com"
0 issuewild "comodoca.com"
0 issuewild "digicert.com; cansignhttpexchanges=yes"
0 issuewild "letsencrypt.org"
0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issuewild "ssl.com"

$ dig +short CAA gitlab.com

The domain is served by several DNS servers, so one server failing won't take it down.

2 NS servers.

diva.ns.cloudflare.com
jermaine.ns.cloudflare.com

$ dig +short NS gitlab.com