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Alberto Bertogli
3b0836f811
When signing repeated headers, today we hash each instance of a header from top to bottom. However, RFC 6376 section 5.4.2 is clear they should be processed bottom to top, and this is also what our verifier (correctly) expects. The bug causes our signatures to be (wrongly) invalid for messages that have repeated signed headers with different values. Note that repeated headers that are not signed (e.g. Received:) are not problematic. This only affects headers we sign, like To:, From:, Subject:. This patch fixes the problem by adjusting the order in which Sign processes repeated headers. This bug was found by fuzzing the sign-verify cycle, which will be added in a later patch.
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.