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Alberto Bertogli
b3a500d9e4
Today, the client can give us any SNI, and still complete a valid negotiation, which means it can be attacker-controlled (including having problematic characters). We use that SNI as our hostname in a variety of places, including Received and Authentication-Results headers. This creates an opportunity for an attacker to manipulate those headers. To fix that problem, this patch only takes the SNI if it matches one of our certs' hostnames. Otherwise we use the configured hostname (same as if there was no SNI today). Once Go 1.27 is our minimum supported version, we can simplify this further by checking the SNI against ConnectionState.LocalCertificate.
chasquid
chasquid is an SMTP (email) server with a focus on simplicity, security, and ease of operation.
It is designed mainly for individuals and small groups.
It's written in Go, and distributed under the Apache license 2.0.
Features
- Easy
- Easy to configure.
- Hard to mis-configure in ways that are harmful or insecure (e.g. no open relay, or clear-text authentication).
- Monitoring HTTP server, with exported variables and tracing to help debugging.
- Integrated with Debian, Ubuntu, Arch, and Alpine.
- Supports using Dovecot for authentication.
- Useful
- Secure
- Tracking of per-domain TLS support, prevents connection downgrading.
- Multiple TLS certificates.
- Easy integration with Let's Encrypt.
- SPF and MTA-STS checking.
- DKIM support (signing and verification).
Documentation
The how-to guide and the installation guide are the best starting points on how to install, configure and run chasquid.
You will find all documentation here.
Contact
If you have any questions, comments or patches, please send them to the mailing
list,
chasquid@googlegroups.com.
To subscribe, send an email to chasquid+subscribe@googlegroups.com.
Security issues can be reported privately to albertito@blitiri.com.ar.
Bug reports and pull requests on GitHub are also welcome.
You can also reach out via IRC, #chasquid on OFTC.