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|
{
flake.modules.nixos.openssh =
{ lib, pkgs, ... }:
{
services.openssh = {
enable = true;
ports = [ 8693 ];
settings = {
AllowTcpForwarding = false;
AllowAgentForwarding = false;
PasswordAuthentication = false;
X11Forwarding = false;
PermitRootLogin = "yes";
};
};
networking.firewall.allowedTCPPorts = [ 8693 ];
services.fail2ban = {
enable = true;
bantime = lib.mkDefault "1h";
jails.sshd = {
enabled = true;
settings = {
port = 8693;
backend = "systemd";
maxretry = 4;
findtime = "10m";
};
};
};
security.pam.services.sshd.text = lib.mkDefault (
lib.mkAfter ''
session optional pam_exec.so ${pkgs.writeShellScript "ssh-login-notify" ''
if [ "$PAM_TYPE" = "open_session" ]; then
TIMESTAMP=$(${pkgs.coreutils}/bin/date "+%Y-%m-%d %H:%M:%S %Z")
HOSTNAME=$(${pkgs.coreutils}/bin/cat /etc/hostname)
{
${pkgs.coreutils}/bin/printf '%s\n' \
"To: leander@schererleander.de" \
"From: root@sachiel.schererleander.de" \
"Subject: SSH login: $PAM_USER from $PAM_RHOST" \
"Content-Type: text/html; charset=UTF-8" \
""
${pkgs.coreutils}/bin/cat <<EOF
<!doctype html>
<html>
<head>
<meta name="color-scheme" content="light dark">
<meta name="supported-color-schemes" content="light dark">
<style>
:root { color-scheme: light dark; }
body { margin: 0; padding: 20px; font: 14px sans-serif; background: #fff; color: #111; }
main { max-width: 600px; margin: auto; }
h1 { margin-top: 0; font-size: 22px; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 6px; text-align: left; border-bottom: 1px solid #ddd; }
th { width: 80px; }
a { color: #06c; }
@media (prefers-color-scheme: dark) {
body { background: #121212; color: #eee; }
th, td { border-color: #333; }
a { color: #6bf; }
}
</style>
</head>
<body>
<main>
<h1>SSH Login</h1>
<table>
<tr><th>User</th><td>$PAM_USER</td></tr>
<tr><th>Host</th><td>$HOSTNAME</td></tr>
<tr><th>Time</th><td>$TIMESTAMP</td></tr>
<tr>
<th>IP</th>
<td>
<a href="https://iplookup.flagfox.net/?ip=$PAM_RHOST">$PAM_RHOST</a>
</td>
</tr>
</table>
</main>
</body>
</html>
EOF
} | /run/wrappers/bin/sendmail \
-f root@sachiel.schererleander.de \
leander@schererleander.de
fi
''}
''
);
};
}
|
