fix: ssh-audit hardenings

[scop]

trafficstars

Proposed Changes

Brings current ssh-audit output green again, and adds an additional moduli hardening per their recommendations.

# algorithm recommendations (for OpenSSH 9.9)
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -curve25519-sha256                    -- kex algorithm to remove 
(rec) [email protected]         -- kex algorithm to remove 
(rec) -diffie-hellman-group16-sha512        -- kex algorithm to remove 
(rec) -diffie-hellman-group18-sha512        -- kex algorithm to remove 

Summary by CodeRabbit

• Security Improvements
  • Enhanced SSH configuration by restricting the moduli file to use stronger cryptographic parameters.
  • Broadened the list of disallowed SSH key exchange algorithms to improve security.

[coderabbitai[bot]]

"""

Walkthrough

The changes update the SSH Dockerfile to filter the moduli file for stronger cryptographic parameters and expand the list of disabled key exchange algorithms in the SSH daemon configuration to further restrict weaker or less preferred algorithms.

Changes

File(s)	Change Summary
ssh/Dockerfile	Adds a hardening step filtering /etc/ssh/moduli to retain entries with a minimum strength of 3071 bits.
ssh/rootfs/etc/ssh/sshd_config	Expands the disabled KexAlgorithms list to exclude additional key exchange algorithms for SSH.

Suggested labels

bugfix

Suggested reviewers

• frenck

Poem

In the burrow where the strong keys dwell,
The moduli were filtered, their stories to tell.
More algorithms banished, the SSH gate tight,
Security’s garden, now guarded at night.
With every hop and every byte,
This bunny ensures your SSH is right! 🐇🔐 """

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📥 Commits

Reviewing files that changed from the base of the PR and between a9d0b12521c3fb2ee386484fcbe9dfb55c09d229 and 6d7e43e093a7b029214167558b952236ac2e2877.

📒 Files selected for processing (1)

• ssh/Dockerfile (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• ssh/Dockerfile

⏰ Context from checks skipped due to timeout of 90000ms (3)

• GitHub Check: workflows / Build armv7
• GitHub Check: workflows / Build amd64
• GitHub Check: workflows / Build aarch64

---

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[github-actions[bot]]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.

[scop]

Not stale