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Hugh Ratsch
2025-02-08 23:27:46 -06:00
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# Security Setup Documentation
## User Management
### New Admin User Creation
```bash
# Create new admin user 'sysadmin'
sudo adduser sysadmin
# Add to sudo group
sudo usermod -aG sudo sysadmin
# Verify sudo access
sudo -l -U sysadmin
```
### Existing User (hugh) Security Enhancement
```bash
# Verify current groups
groups hugh
# Ensure proper sudo access
sudo usermod -aG sudo hugh
```
## SSH Key Configuration
### Existing Windows SSH Key
1. Display public key content on Windows:
```powershell
# In PowerShell/Command Prompt
type C:\Users\YourUsername\.ssh\id_rsa.pub
```
2. Add public key to authorized_keys:
```bash
# On Ubuntu Server
mkdir -p ~/.ssh
chmod 700 ~/.ssh
nano ~/.ssh/authorized_keys
# Paste your public key here
chmod 600 ~/.ssh/authorized_keys
```
## SSH Server Hardening
```bash
# Backup original config
sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak
# Edit SSH config
sudo nano /etc/ssh/sshd_config
```
Required SSH configurations:
```conf
# Security settings
PermitRootLogin no
PasswordAuthentication no
PubkeyAuthentication yes
AllowUsers hugh sysadmin
# Additional hardening
Protocol 2
X11Forwarding no
MaxAuthTries 3
```
## Applied Security Measures
- [x] Created sysadmin user
- [x] Enhanced hugh user security
- [x] Configured SSH key authentication
- [x] Applied SSH hardening settings
- [x] Tested SSH access
- [x] Configured UFW firewall
## Firewall Setup (UFW) ✅
### Current UFW Configuration
```bash
Status: active
# Allowed incoming connections:
1. SSH (22/tcp)
2. HTTP (80/tcp)
3. HTTPS (443/tcp)
4. All traffic from host (169.254.167.242)
# Default policies:
- Incoming: deny (default)
- Outgoing: allow (default)
```
### Applied Rules
```bash
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow ssh
sudo ufw allow http
sudo ufw allow https
sudo ufw allow from 169.254.167.242
```
### Verification
```bash
# Current firewall status
sudo ufw status numbered
```