sunlight
certspotter
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| sunlight | certspotter | |
|---|---|---|
| 3 | 4 | |
| 107 | 913 | |
| - | 1.2% | |
| 8.9 | 6.9 | |
| 21 days ago | 25 days ago | |
| Go | Go | |
| ISC License | Mozilla Public License 2.0 |
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sunlight
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Sunlight, a Certificate Transparency log implementation
This is one of the projects I've been most excited about in the last few years. It let me backport to Certificate Transparency a lot of the modern transparency logging designs that came after it.
Beyond the Let's Encrypt announcement and the ct-policy thread (which includes a technical and advantages summary), here are a few resources that might be interesting.
- Design document https://filippo.io/a-different-CT-log
- Implementation https://github.com/FiloSottile/sunlight
- API specification https://c2sp.org/sunlight
- Website, including test logs and feedback channels https://sunlight.dev/
If you’re thinking “oh we could use something similar” please reach out! Sunlight is retrofitting some of the modern tlog designs on a legacy system. With a greenfield deployment you can do even better! I’m working with the Sigsum project on specs, tooling, and a support ecosystem to make deploying tlogs easier and safer.
certspotter
- SSLMate/Certspotter: Certificate Transparency Log Monitor
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Last Chance to Fix EIDAS (Mozilla)
> 1. Is this proactively monitored for? And how? And by whom?
Yes, security researchers and domain owners use Certificate Transparency Monitors to search for certificates. e.g.:
https://crt.sh/ - allows you to search for certificates for a domain
https://github.com/SSLMate/certspotter/ - open source tool which notifies you when a certificate is issued for one of your domains
https://sslmate.com/certspotter/ - commercial service that does the same, operated by my company
> 2. If a major state-level CA was discovered to have issued a mitm cert, would browser vendors really take the commercial hit of removing or distrusting their root cert?
In 2017, Chrome and Firefox distrusted Symantec, which was at the time the world's largest certificate authority: https://security.googleblog.com/2017/09/chromes-plan-to-dist...
Symantec hadn't even issued MitM certs - they were just grossly incompetent. Distrusting them was very painful, but necessary to upload the integrity of the CA system, and demonstrated conclusively that there is no such thing as a too-big-to-fail CA.
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Encrypted traffic interception on Hetzner and Linode targeting Jabber service
Indeed, a CT monitor which sends alerts about legitimate certificates is pretty much useless due to noise. My service, Cert Spotter, provides an API endpoint[1] which you can upload your CSRs to, so you don't get alerted about certificates using the same key as the CSR. The open source version of Cert Spotter can invoke a script[2] when a certificate is discovered, and the script can cross reference against a list of legitimate certs.
[1] https://sslmate.com/help/reference/certspotter_authorization...
[2] https://github.com/SSLMate/certspotter/blob/master/man/certs...
- Google's Certificate Transparency Search page to be discontinued May 15th, 2022
What are some alternatives?
certificates - 🛡️ A private certificate authority (X.509 & SSH) & ACME server for secure automated certificate management, so you can use TLS everywhere & SSO for SSH.
osv.dev - Open source vulnerability DB and triage service.
check_ssl_cert - A shell script (that can be used as a Nagios/Icinga plugin) to check an SSL/TLS connection.
acmetool - :lock: acmetool, an automatic certificate acquisition tool for ACME (Let's Encrypt)
rap - Raspberry Pi RIPE Atlas Probe
certificate-transparency-go - Auditing for TLS certificates (Go code)