Archived
beatzaplenty
a854412117
Covers node 1 hardware/network layout, LVM-thin -> ZFS migration path, Ceph as the future HA storage upgrade, and baseline SSH/firewall hardening.
52 lines
1.3 KiB
Bash
Executable File
52 lines
1.3 KiB
Bash
Executable File
#!/bin/bash
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# Apply baseline SSH hardening to a Proxmox VE node: key-only root login
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# + fail2ban. Idempotent - safe to re-run. Run as root on the PVE host.
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set -euo pipefail
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DROPIN_DIR="/etc/ssh/sshd_config.d"
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DROPIN_FILE="${DROPIN_DIR}/99-hardening.conf"
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if [ "$(id -u)" -ne 0 ]; then
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echo "Must run as root." >&2
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exit 1
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fi
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mkdir -p "$DROPIN_DIR"
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cat > "$DROPIN_FILE" <<'EOF'
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PermitRootLogin prohibit-password
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PasswordAuthentication no
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EOF
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echo "Wrote $DROPIN_FILE"
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if ! authorized_keys_present=$(find /root/.ssh/authorized_keys /home/*/.ssh/authorized_keys -type f 2>/dev/null | head -n1); then
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authorized_keys_present=""
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fi
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if [ -z "$authorized_keys_present" ]; then
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echo "WARNING: no authorized_keys found for any user yet." >&2
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echo "Add your SSH public key before disconnecting, or you'll lock yourself out." >&2
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fi
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sshd -t
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systemctl reload sshd
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echo "sshd reloaded with key-only root login."
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if ! dpkg -s fail2ban >/dev/null 2>&1; then
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apt-get update
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apt-get install -y fail2ban
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fi
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mkdir -p /etc/fail2ban/jail.d
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cat > /etc/fail2ban/jail.d/sshd.local <<'EOF'
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[sshd]
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enabled = true
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port = ssh
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backend = systemd
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maxretry = 5
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bantime = 1h
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findtime = 10m
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EOF
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systemctl enable --now fail2ban
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systemctl restart fail2ban
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echo "fail2ban enabled for sshd."
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