From 15b9dea7a95765f1f3c09fe0dcb2ea5b5cb669c1 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Fri, 4 Aug 2023 14:18:08 +0200
Subject: import some common modules

---
 digitalocean/server/etc/sshd_config | 39 +++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 digitalocean/server/etc/sshd_config

(limited to 'digitalocean/server/etc/sshd_config')

diff --git a/digitalocean/server/etc/sshd_config b/digitalocean/server/etc/sshd_config
new file mode 100644
index 0000000..ae08408
--- /dev/null
+++ b/digitalocean/server/etc/sshd_config
@@ -0,0 +1,39 @@
+Protocol 2
+Port ${port}
+
+# Drop idle sessions:
+ClientAliveCountMax 3
+ClientAliveInterval 15
+
+# Allow reverse tunnels:
+GatewayPorts yes
+
+# Miscellaneous:
+PrintMotd no
+
+# Hardening.
+# Source: https://infosec.mozilla.org/guidelines/openssh.html
+
+# Only Ed25519:
+HostKey /etc/ssh/ssh_host_ed25519_key
+
+# Only the first choices for ciphers:
+KexAlgorithms curve25519-sha256@libssh.org
+Ciphers chacha20-poly1305@openssh.com
+MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com
+
+# No password login:
+PasswordAuthentication no
+AuthenticationMethods publickey
+# Whitelist users:
+PermitRootLogin no
+AllowGroups ${join(" ", users)}
+
+# Log things:
+Subsystem sftp /usr/lib/openssh/sftp-server -f AUTHPRIV -l INFO
+
+# Whitelist accepted environment variables:
+AcceptEnv LANG LC_*
+
+# Why the fuck would I need X11 forwarding?
+X11Forwarding no
-- 
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