mrcharles
cefe2f7cfa
Port Modules/Security/secharden-ssh.sh. Deploys: - Authorized keys for root, localuser, subodev (conditional on existence) - Hardened /etc/ssh/sshd_config (skipped on dev workstations) - ssh-audit hardening drop-in for algorithm restrictions (skipped on Ubuntu where it breaks openssh-server) - Lockdown of sshd_config.d directory permissions SSH service is validated (sshd -t) before restart. 🤖 Generated with [Crush](https://github.com/charmassociates/crush) Assisted-by: GLM-5 via Crush <crush@charm.land>
20 lines
1.4 KiB
Plaintext
20 lines
1.4 KiB
Plaintext
# Restrict key exchange, cipher, and MAC algorithms, as per sshaudit.com
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# hardening guide.
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KexAlgorithms sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,gss-curve25519-sha256-,diffie-hellman-group16-sha512,gss-group16-sha512-,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-gcm@openssh.com,aes128-ctr
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MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com
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HostKeyAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256
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RequiredRSASize 3072
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CASignatureAlgorithms sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256
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GSSAPIKexAlgorithms gss-curve25519-sha256-,gss-group16-sha512-
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HostbasedAcceptedAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
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PubkeyAcceptedAlgorithms sk-ssh-ed25519-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-256
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