Review TLS cipher default configuration
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Description
Mozilla's SSL config generator (which we more or less use as a reference for out default configuration) did their "first major refresh of guidelines since 2020", which means they don't recommend DHE anymore. For Icinga 2 that would imply removing DHE-RSA-AES128-GCM-SHA256, DHE-RSA-AES256-GCM-SHA384, and DHE-RSA-CHACHA20-POLY1305.
I don't get the reson though, release says "recommended ciphers for Intermediate are now all PFS with AEAD", but DHE provides PFS, no matter if on elliptic curves or not, and AES-GCM and CHACHA20-POLY1305 are AEAD ciphers.
I'm mainly creating this issue to have something in the 2.17.0 milestone, so that this doesn't come as a surprise again then. :)
refs https://github.com/Icinga/icinga2/issues/10852#issuecomment-4499631428
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
The issue names no file or test; start by locating Icinga 2's default TLS cipher configuration and compare it with Mozilla SSL config generator v5.8 and the referenced issue #10852. Done means resolving whether the three DHE-RSA ciphers should remain and recording or updating the 2.17.0 default accordingly.
Written by the indexing model from the issue text.
Assessment
- Domain
- security
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 38/100