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Alberto Bertogli
10aa1a55d0
We currently use the s= and d= tags as-is without any validation. They are used to construct the DNS name to look up the key, which is generally fine, but also the d= tag is used as-is in the Authentication-Results header. The latter can be used to inject malicious content, for example: d=example.com dkim=pass header.d=example.net can result in the header including: header.d=example.com dkim=pass header.d=example.net regardless of the validation status. To fix that problem, this patch now validates the domain (using the same normalization we use in other areas, like RCPT TO and MAIL FROM) on both tags. If any of the tags have invalid domains, we consider the signature invalid as per RFC 6376 section 3.5.
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.