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Added Debian 13 policies and hardening guides.

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Joe Testa
2025-09-01 18:22:46 -04:00
parent f821565ff9
commit 4f9a630de4
3 changed files with 47 additions and 0 deletions
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src/ssh_audit/hardening_guides.py
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@@ -234,6 +234,47 @@ class Hardening_Guides:
},
],
"Debian 13": [
{
"server_guide": True,
"version": 1,
"version_date": "2025-09-01",
"change_log": "Initial revision. As compared to the Debian 12 guide, the following changes were made: 1.) all non-post-quantum key exchanges were removed, and mlkem768x25519-sha256 and sntrup761x25519-sha512 were added, 2.) editing the /etc/ssh/moduli file is no longer done, as we no longer use any group-exchange algorithms (none of them currently protect against quantum attacks), 3.) editing the sshd_config file is no longer done, in order to make system upgrades easier for users, 4.) network-level connection throttling is no longer done, as OpenSSH prevents the DHEat attack by default now.",
"notes": "all commands below are to be executed as the root user.",
"commands": [
{
"heading": "Re-generate the ED25519 and RSA keys",
"comment": "",
"command": "rm /etc/ssh/ssh_host_*\nssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N \"\"\nssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N \"\""
},
{
"heading": "Restrict supported key exchange, cipher, and MAC algorithms",
"comment": "",
"command": "echo -e \"# Restrict key exchange, cipher, and MAC algorithms, as per sshaudit.com\\n# hardening guide.\\nKexAlgorithms mlkem768x25519-sha256,sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com\\n\\nCiphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-gcm@openssh.com,aes128-ctr\\n\\nMACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com\\n\\nRequiredRSASize 3072\\n\\nHostKeyAlgorithms 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\\n\\nCASignatureAlgorithms sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256\\n\\nGSSAPIKexAlgorithms gss-curve25519-sha256-,gss-group16-sha512-\\n\\nHostbasedAcceptedAlgorithms 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\\n\\nPubkeyAcceptedAlgorithms 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\" > /etc/ssh/sshd_config.d/debian13_ssh-audit_hardening.conf"
},
{
"heading": "Restart OpenSSH server",
"comment": "",
"command": "service ssh restart"
},
]
},
{
"server_guide": False,
"version": 1,
"version_date": "2025-09-01",
"change_log": "Initial revision. As compared to the Debian 12 guide, the following changes were made: all non-post-quantum key exchanges were removed.",
"notes": "",
"commands": [
{
"heading": "Run the following in a terminal to harden the SSH client for the local user:",
"comment": "",
"command": "mkdir -p -m 0700 ~/.ssh; echo -e \"\\nHost *\\n Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-gcm@openssh.com,aes128-ctr\\n\\n KexAlgorithms mlkem768x25519-sha256,sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com\\n\\n MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com\\n\\n RequiredRSASize 3072\\n\\n 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\\n\\n CASignatureAlgorithms sk-ssh-ed25519@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256\\n\\n GSSAPIKexAlgorithms gss-curve25519-sha256-,gss-group16-sha512-\\n\\n 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\\n\\n 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\\n\\n\" >> ~/.ssh/config"
},
]
},
],
"Rocky Linux 9": [
{
"server_guide": True,