Implement comprehensive two-factor authentication for SSH and web services

- Complete rewrite of secharden-2fa.sh with full 2FA implementation
- SSH 2FA using Google Authenticator with publickey + TOTP authentication
- Cockpit web interface 2FA with custom PAM configuration
- Webmin 2FA support with automatic detection and configuration
- User setup automation with QR codes and backup codes generation
- Gradual rollout support using nullok for phased deployment
- Automatic configuration backup and restore procedures
- Add 2fa-validation.sh security test for comprehensive validation
- Create TSYS-2FA-GUIDE.md with complete implementation documentation
- Add DEVELOPMENT-GUIDELINES.md with coding standards and best practices
- Optimize package installation with single apt-get commands for performance

The 2FA implementation provides enterprise-grade security while maintaining
usability and proper emergency access procedures. Includes comprehensive
testing, documentation, and follows established security best practices.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
2025-07-14 10:23:07 -05:00
parent f6acf660f6
commit a632e7d514
4 changed files with 1429 additions and 6 deletions

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DEVELOPMENT-GUIDELINES.md Normal file
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# TSYS FetchApply Development Guidelines
## Overview
This document contains development standards and best practices for the TSYS FetchApply infrastructure provisioning system.
## Package Management Best Practices
### Combine apt-get Install Commands
**Rule:** Always combine multiple package installations into a single `apt-get install` command for performance.
**Rationale:** Single command execution is significantly faster than multiple separate commands due to:
- Reduced package cache processing
- Single dependency resolution
- Fewer network connections
- Optimized package download ordering
#### ✅ Correct Implementation
```bash
# Install all packages in one command
apt-get install -y package1 package2 package3 package4
# Real example from 2FA script
apt-get install -y libpam-google-authenticator qrencode
```
#### ❌ Incorrect Implementation
```bash
# Don't use separate commands for each package
apt-get install -y package1
apt-get install -y package2
apt-get install -y package3
```
#### Complex Package Installation Pattern
```bash
function install_security_packages() {
print_info "Installing security packages..."
# Update package cache once
apt-get update
# Install all packages in single command
apt-get install -y \
auditd \
fail2ban \
libpam-google-authenticator \
lynis \
rkhunter \
aide \
chkrootkit \
clamav \
clamav-daemon
print_success "Security packages installed successfully"
}
```
## Script Development Standards
### Error Handling
- Always use `set -euo pipefail` at script start
- Implement proper error trapping
- Use framework error handling functions
- Return appropriate exit codes
### Function Structure
```bash
function function_name() {
print_info "Description of what function does..."
# Local variables
local var1="value"
local var2="value"
# Function logic
if [[ condition ]]; then
print_success "Success message"
return 0
else
print_error "Error message"
return 1
fi
}
```
### Framework Integration
- Source framework includes at script start
- Use framework logging and pretty print functions
- Follow existing patterns for consistency
- Include proper PROJECT_ROOT path resolution
```bash
# Standard framework sourcing pattern
PROJECT_ROOT="$(dirname "$(realpath "${BASH_SOURCE[0]}")")/../.."
source "$PROJECT_ROOT/Framework-Includes/PrettyPrint.sh"
source "$PROJECT_ROOT/Framework-Includes/Logging.sh"
source "$PROJECT_ROOT/Framework-Includes/ErrorHandling.sh"
```
## Code Quality Standards
### ShellCheck Compliance
- All scripts must pass shellcheck validation
- Address shellcheck warnings appropriately
- Use proper quoting for variables
- Handle edge cases and error conditions
### Variable Naming
- Use UPPERCASE for global constants
- Use lowercase for local variables
- Use descriptive names
- Quote all variable expansions
```bash
# Global constants
declare -g BACKUP_DIR="/root/backup"
declare -g CONFIG_FILE="/etc/ssh/sshd_config"
# Local variables
local user_name="localuser"
local temp_file="/tmp/config.tmp"
# Proper quoting
if [[ -f "$CONFIG_FILE" ]]; then
cp "$CONFIG_FILE" "$BACKUP_DIR/"
fi
```
### Function Documentation
- Include purpose description
- Document parameters if any
- Document return values
- Include usage examples for complex functions
```bash
# Configure SSH hardening settings
# Parameters: none
# Returns: 0 on success, 1 on failure
# Usage: configure_ssh_hardening
function configure_ssh_hardening() {
print_info "Configuring SSH hardening..."
# Implementation
}
```
## Testing Requirements
### Test Coverage
- Every new module must include corresponding tests
- Test both success and failure scenarios
- Validate configurations after changes
- Include integration tests for complex workflows
### Test Categories
1. **Unit Tests:** Individual function validation
2. **Integration Tests:** Module interaction testing
3. **Security Tests:** Security configuration validation
4. **Validation Tests:** System requirement checking
### Test Implementation Pattern
```bash
function test_function_name() {
echo "🔍 Testing specific functionality..."
local failed=0
# Test implementation
if [[ condition ]]; then
echo "✅ Test passed"
else
echo "❌ Test failed"
((failed++))
fi
return $failed
}
```
## Security Standards
### Configuration Backup
- Always backup configurations before modification
- Use timestamped backup directories
- Provide restore instructions
- Test backup/restore procedures
### Service Management
- Test configurations before restarting services
- Provide rollback procedures
- Validate service status after changes
- Include service dependency handling
### User Safety
- Use `nullok` for gradual 2FA rollout
- Provide clear setup instructions
- Include emergency access procedures
- Test all access methods before enforcement
## Documentation Standards
### Script Headers
```bash
#!/bin/bash
# TSYS Module Name - Brief Description
# Longer description of what this script does
# Author: TSYS Development Team
# Version: 1.0
# Last Updated: YYYY-MM-DD
set -euo pipefail
```
### Inline Documentation
- Comment complex logic
- Explain non-obvious decisions
- Document external dependencies
- Include troubleshooting notes
### User Documentation
- Create comprehensive guides for complex features
- Include step-by-step procedures
- Provide troubleshooting sections
- Include examples and use cases
## Performance Optimization
### Package Management
- Single apt-get commands (as noted above)
- Cache package lists appropriately
- Use specific package versions when stability required
- Clean up package cache when appropriate
### Network Operations
- Use connection timeouts for external requests
- Implement retry logic with backoff
- Cache downloaded resources when possible
- Validate download integrity
### File Operations
- Use efficient file processing tools
- Minimize file system operations
- Use appropriate file permissions
- Clean up temporary files
## Version Control Practices
### Commit Messages
- Use descriptive commit messages
- Include scope of changes
- Reference related issues/requirements
- Follow established commit message format
### Branch Management
- Test changes in feature branches
- Use pull requests for review
- Maintain clean commit history
- Tag releases appropriately
### Code Review Requirements
- All changes require review
- Security changes require security team review
- Test coverage must be maintained
- Documentation must be updated
## Deployment Practices
### Pre-Deployment
- Run full test suite
- Validate in test environment
- Review security implications
- Update documentation
### Deployment Process
- Use configuration validation
- Implement gradual rollout when possible
- Monitor for issues during deployment
- Have rollback procedures ready
### Post-Deployment
- Validate deployment success
- Monitor system performance
- Update operational documentation
- Gather feedback for improvements
## Example Implementation
### Complete Module Template
```bash
#!/bin/bash
# TSYS Security Module - Template
# Template for creating new security modules
# Author: TSYS Development Team
set -euo pipefail
# Source framework functions
PROJECT_ROOT="$(dirname "$(realpath "${BASH_SOURCE[0]}")")/../.."
source "$PROJECT_ROOT/Framework-Includes/PrettyPrint.sh"
source "$PROJECT_ROOT/Framework-Includes/Logging.sh"
source "$PROJECT_ROOT/Framework-Includes/ErrorHandling.sh"
# Module configuration
BACKUP_DIR="/root/backup/module-$(date +%Y%m%d-%H%M%S)"
CONFIG_FILE="/etc/example.conf"
# Create backup directory
mkdir -p "$BACKUP_DIR"
print_header "TSYS Module Template"
function backup_configs() {
print_info "Creating configuration backup..."
if [[ -f "$CONFIG_FILE" ]]; then
cp "$CONFIG_FILE" "$BACKUP_DIR/"
print_success "Configuration backed up"
fi
}
function install_packages() {
print_info "Installing required packages..."
# Update package cache
apt-get update
# Install all packages in single command
apt-get install -y package1 package2 package3
print_success "Packages installed successfully"
}
function configure_module() {
print_info "Configuring module..."
# Configuration logic here
print_success "Module configured successfully"
}
function validate_configuration() {
print_info "Validating configuration..."
local failed=0
# Validation logic here
if [[ $failed -eq 0 ]]; then
print_success "Configuration validation passed"
return 0
else
print_error "Configuration validation failed"
return 1
fi
}
function main() {
# Check if running as root
if [[ $EUID -ne 0 ]]; then
print_error "This script must be run as root"
exit 1
fi
# Execute module steps
backup_configs
install_packages
configure_module
validate_configuration
print_success "Module setup completed successfully!"
}
# Run main function
main "$@"
```
## Continuous Improvement
### Regular Reviews
- Review guidelines quarterly
- Update based on lessons learned
- Incorporate new best practices
- Gather team feedback
### Tool Updates
- Keep development tools current
- Adopt new security practices
- Update testing frameworks
- Improve automation
### Knowledge Sharing
- Document lessons learned
- Share best practices
- Provide training materials
- Maintain knowledge base
---
**Last Updated:** July 14, 2025
**Version:** 1.0
**Author:** TSYS Development Team
**Note:** These guidelines are living documents and should be updated as the project evolves and new best practices are identified.

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#!/bin/bash
# Two-Factor Authentication Validation Test
# Validates 2FA configuration for SSH, Cockpit, and Webmin
set -euo pipefail
PROJECT_ROOT="$(dirname "$(realpath "${BASH_SOURCE[0]}")")/../.."
function test_2fa_packages() {
echo "🔍 Testing 2FA package installation..."
local packages=("libpam-google-authenticator" "qrencode")
local failed=0
for package in "${packages[@]}"; do
if dpkg -l | grep -q "^ii.*$package"; then
echo "✅ Package installed: $package"
else
echo "❌ Package missing: $package"
((failed++))
fi
done
# Check if google-authenticator command exists
if command -v google-authenticator >/dev/null 2>&1; then
echo "✅ Google Authenticator command available"
else
echo "❌ Google Authenticator command not found"
((failed++))
fi
return $failed
}
function test_ssh_2fa_config() {
echo "🔍 Testing SSH 2FA configuration..."
local ssh_config="/etc/ssh/sshd_config"
local failed=0
# Check required SSH settings
if grep -q "^ChallengeResponseAuthentication yes" "$ssh_config"; then
echo "✅ ChallengeResponseAuthentication enabled"
else
echo "❌ ChallengeResponseAuthentication not enabled"
((failed++))
fi
if grep -q "^UsePAM yes" "$ssh_config"; then
echo "✅ UsePAM enabled"
else
echo "❌ UsePAM not enabled"
((failed++))
fi
if grep -q "^AuthenticationMethods publickey,keyboard-interactive" "$ssh_config"; then
echo "✅ AuthenticationMethods configured for 2FA"
else
echo "❌ AuthenticationMethods not configured for 2FA"
((failed++))
fi
return $failed
}
function test_pam_2fa_config() {
echo "🔍 Testing PAM 2FA configuration..."
local pam_sshd="/etc/pam.d/sshd"
local failed=0
# Check if PAM includes Google Authenticator
if grep -q "pam_google_authenticator.so" "$pam_sshd"; then
echo "✅ PAM Google Authenticator module configured"
else
echo "❌ PAM Google Authenticator module not configured"
((failed++))
fi
# Check if nullok is present (allows users without 2FA setup)
if grep -q "pam_google_authenticator.so nullok" "$pam_sshd"; then
echo "✅ PAM nullok option configured (allows gradual rollout)"
else
echo "⚠️ PAM nullok option not configured (immediate enforcement)"
fi
return $failed
}
function test_cockpit_2fa_config() {
echo "🔍 Testing Cockpit 2FA configuration..."
local cockpit_config="/etc/cockpit/cockpit.conf"
local cockpit_pam="/etc/pam.d/cockpit"
local failed=0
# Check if Cockpit is installed
if ! command -v cockpit-ws >/dev/null 2>&1; then
echo "⚠️ Cockpit not installed, skipping test"
return 0
fi
# Check Cockpit configuration
if [[ -f "$cockpit_config" ]]; then
echo "✅ Cockpit configuration file exists"
else
echo "❌ Cockpit configuration file missing"
((failed++))
fi
# Check Cockpit PAM configuration
if [[ -f "$cockpit_pam" ]] && grep -q "pam_google_authenticator.so" "$cockpit_pam"; then
echo "✅ Cockpit PAM 2FA configured"
else
echo "❌ Cockpit PAM 2FA not configured"
((failed++))
fi
return $failed
}
function test_webmin_2fa_config() {
echo "🔍 Testing Webmin 2FA configuration..."
local webmin_config="/etc/webmin/miniserv.conf"
local failed=0
# Check if Webmin is installed
if [[ ! -f "$webmin_config" ]]; then
echo "⚠️ Webmin not installed, skipping test"
return 0
fi
# Check Webmin 2FA settings
if grep -q "^twofactor_provider=totp" "$webmin_config"; then
echo "✅ Webmin TOTP provider configured"
else
echo "❌ Webmin TOTP provider not configured"
((failed++))
fi
if grep -q "^twofactor=1" "$webmin_config"; then
echo "✅ Webmin 2FA enabled"
else
echo "❌ Webmin 2FA not enabled"
((failed++))
fi
return $failed
}
function test_user_2fa_setup() {
echo "🔍 Testing user 2FA setup preparation..."
local users=("localuser" "root")
local failed=0
for user in "${users[@]}"; do
if id "$user" &>/dev/null; then
# Check if setup script exists
if [[ -f "/tmp/setup-2fa-$user.sh" ]]; then
echo "✅ 2FA setup script exists for user: $user"
else
echo "❌ 2FA setup script missing for user: $user"
((failed++))
fi
# Check if instructions exist
if [[ -f "/home/$user/2fa-setup-instructions.txt" ]]; then
echo "✅ 2FA instructions exist for user: $user"
else
echo "❌ 2FA instructions missing for user: $user"
((failed++))
fi
else
echo "⚠️ User $user not found, skipping"
fi
done
return $failed
}
function test_service_status() {
echo "🔍 Testing service status..."
local failed=0
# Test SSH service
if systemctl is-active sshd >/dev/null 2>&1; then
echo "✅ SSH service is running"
else
echo "❌ SSH service is not running"
((failed++))
fi
# Test SSH configuration
if sshd -t 2>/dev/null; then
echo "✅ SSH configuration is valid"
else
echo "❌ SSH configuration is invalid"
((failed++))
fi
# Test Cockpit service if installed
if systemctl is-enabled cockpit.socket >/dev/null 2>&1; then
if systemctl is-active cockpit.socket >/dev/null 2>&1; then
echo "✅ Cockpit service is running"
else
echo "❌ Cockpit service is not running"
((failed++))
fi
fi
# Test Webmin service if installed
if systemctl is-enabled webmin >/dev/null 2>&1; then
if systemctl is-active webmin >/dev/null 2>&1; then
echo "✅ Webmin service is running"
else
echo "❌ Webmin service is not running"
((failed++))
fi
fi
return $failed
}
function test_backup_existence() {
echo "🔍 Testing backup existence..."
local backup_dir="/root/backup"
local failed=0
if [[ -d "$backup_dir" ]]; then
# Look for recent 2FA backups
local recent_backups=$(find "$backup_dir" -name "2fa-*" -type d -newer /etc/ssh/sshd_config 2>/dev/null | wc -l)
if [[ $recent_backups -gt 0 ]]; then
echo "✅ Recent 2FA backup found in $backup_dir"
else
echo "⚠️ No recent 2FA backups found"
fi
else
echo "❌ Backup directory does not exist"
((failed++))
fi
return $failed
}
function test_2fa_enforcement() {
echo "🔍 Testing 2FA enforcement level..."
local pam_sshd="/etc/pam.d/sshd"
# Check if nullok is used (allows users without 2FA)
if grep -q "pam_google_authenticator.so nullok" "$pam_sshd"; then
echo "⚠️ 2FA enforcement: GRADUAL (nullok allows users without 2FA)"
echo " Users can log in without 2FA during setup phase"
else
echo "✅ 2FA enforcement: STRICT (all users must have 2FA)"
echo " All users must have 2FA configured to log in"
fi
return 0
}
# Main test execution
function main() {
echo "🔒 Running Two-Factor Authentication Validation Tests"
echo "=================================================="
local total_failures=0
# Run all 2FA validation tests
test_2fa_packages || ((total_failures++))
test_ssh_2fa_config || ((total_failures++))
test_pam_2fa_config || ((total_failures++))
test_cockpit_2fa_config || ((total_failures++))
test_webmin_2fa_config || ((total_failures++))
test_user_2fa_setup || ((total_failures++))
test_service_status || ((total_failures++))
test_backup_existence || ((total_failures++))
test_2fa_enforcement || ((total_failures++))
echo "=================================================="
if [[ $total_failures -eq 0 ]]; then
echo "✅ All 2FA validation tests passed"
echo ""
echo "📋 Next Steps:"
echo "1. Run user setup scripts: /tmp/setup-2fa-*.sh"
echo "2. Test 2FA login from another terminal"
echo "3. Remove nullok from PAM config for strict enforcement"
exit 0
else
echo "$total_failures 2FA validation tests failed"
echo ""
echo "🔧 Troubleshooting:"
echo "1. Re-run secharden-2fa.sh script"
echo "2. Check system logs: journalctl -u sshd"
echo "3. Verify package installation"
exit 1
fi
}
# Run main if executed directly
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
main "$@"
fi

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#!/bin/bash #!/bin/bash
# TSYS Security Hardening - Two-Factor Authentication
# Implements 2FA for SSH, Cockpit, and Webmin services
# Uses Google Authenticator (TOTP) for time-based tokens
#secharden-2fa set -euo pipefail
#Coming very soon, 2fa for webmin/cockpit/ssh
#libpam-google-authenticator
#https://www.ogselfhosting.com/index.php/2024/03/21/enabling-2fa-for-cockpit/ # Source framework functions
#https://webmin.com/docs/modules/webmin-configuration/#two-factor-authentication PROJECT_ROOT="$(dirname "$(realpath "${BASH_SOURCE[0]}")")/../.."
#https://www.digitalocean.com/community/tutorials/how-to-set-up-multi-factor-authentication-for-ssh-on-ubuntu-18-04 source "$PROJECT_ROOT/Framework-Includes/PrettyPrint.sh"
source "$PROJECT_ROOT/Framework-Includes/Logging.sh"
source "$PROJECT_ROOT/Framework-Includes/ErrorHandling.sh"
# 2FA Configuration
BACKUP_DIR="/root/backup/2fa-$(date +%Y%m%d-%H%M%S)"
PAM_CONFIG_DIR="/etc/pam.d"
SSH_CONFIG="/etc/ssh/sshd_config"
COCKPIT_CONFIG="/etc/cockpit/cockpit.conf"
# Create backup directory
mkdir -p "$BACKUP_DIR"
print_header "TSYS Two-Factor Authentication Setup"
# Backup existing configurations
function backup_configs() {
print_info "Creating backup of existing configurations..."
# Backup SSH configuration
if [[ -f "$SSH_CONFIG" ]]; then
cp "$SSH_CONFIG" "$BACKUP_DIR/sshd_config.bak"
print_success "SSH config backed up"
fi
# Backup PAM configurations
if [[ -d "$PAM_CONFIG_DIR" ]]; then
cp -r "$PAM_CONFIG_DIR" "$BACKUP_DIR/pam.d.bak"
print_success "PAM configs backed up"
fi
# Backup Cockpit configuration if exists
if [[ -f "$COCKPIT_CONFIG" ]]; then
cp "$COCKPIT_CONFIG" "$BACKUP_DIR/cockpit.conf.bak"
print_success "Cockpit config backed up"
fi
print_info "Backup completed: $BACKUP_DIR"
}
# Install required packages
function install_2fa_packages() {
print_info "Installing 2FA packages..."
# Update package cache
apt-get update
# Install Google Authenticator PAM module
# Install QR code generator for terminal display
apt-get install -y libpam-google-authenticator qrencode
print_success "2FA packages installed successfully"
}
# Configure SSH for 2FA
function configure_ssh_2fa() {
print_info "Configuring SSH for 2FA..."
# Configure SSH daemon
print_info "Updating SSH configuration..."
# Enable challenge-response authentication
if ! grep -q "^ChallengeResponseAuthentication yes" "$SSH_CONFIG"; then
sed -i 's/^ChallengeResponseAuthentication.*/ChallengeResponseAuthentication yes/' "$SSH_CONFIG" || \
echo "ChallengeResponseAuthentication yes" >> "$SSH_CONFIG"
fi
# Enable PAM authentication
if ! grep -q "^UsePAM yes" "$SSH_CONFIG"; then
sed -i 's/^UsePAM.*/UsePAM yes/' "$SSH_CONFIG" || \
echo "UsePAM yes" >> "$SSH_CONFIG"
fi
# Configure authentication methods (key + 2FA)
if ! grep -q "^AuthenticationMethods" "$SSH_CONFIG"; then
echo "AuthenticationMethods publickey,keyboard-interactive" >> "$SSH_CONFIG"
else
sed -i 's/^AuthenticationMethods.*/AuthenticationMethods publickey,keyboard-interactive/' "$SSH_CONFIG"
fi
print_success "SSH configuration updated"
}
# Configure PAM for 2FA
function configure_pam_2fa() {
print_info "Configuring PAM for 2FA..."
# Create backup of original PAM SSH config
cp "$PAM_CONFIG_DIR/sshd" "$PAM_CONFIG_DIR/sshd.bak.$(date +%Y%m%d)"
# Configure PAM to use Google Authenticator
cat > "$PAM_CONFIG_DIR/sshd" << 'EOF'
# PAM configuration for SSH with 2FA
# Standard Un*x authentication
@include common-auth
# Google Authenticator 2FA
auth required pam_google_authenticator.so nullok
# Standard Un*x authorization
@include common-account
# SELinux needs to be the first session rule
session required pam_selinux.so close
session required pam_loginuid.so
# Standard Un*x session setup and teardown
@include common-session
# Print the message of the day upon successful login
session optional pam_motd.so motd=/run/motd.dynamic
session optional pam_motd.so noupdate
# Print the status of the user's mailbox upon successful login
session optional pam_mail.so standard noenv
# Set up user limits from /etc/security/limits.conf
session required pam_limits.so
# SELinux needs to intervene at login time
session required pam_selinux.so open
# Standard Un*x password updating
@include common-password
EOF
print_success "PAM configuration updated for SSH 2FA"
}
# Configure Cockpit for 2FA
function configure_cockpit_2fa() {
print_info "Configuring Cockpit for 2FA..."
# Create Cockpit config directory if it doesn't exist
mkdir -p "$(dirname "$COCKPIT_CONFIG")"
# Configure Cockpit to use PAM with 2FA
cat > "$COCKPIT_CONFIG" << 'EOF'
[WebService]
# Enable 2FA for Cockpit web interface
LoginTitle = TSYS Server Management
LoginTo = 300
RequireHost = true
[Session]
# Use PAM for authentication (includes 2FA)
Banner = /etc/cockpit/issue.cockpit
IdleTimeout = 15
EOF
# Create PAM configuration for Cockpit
cat > "$PAM_CONFIG_DIR/cockpit" << 'EOF'
# PAM configuration for Cockpit with 2FA
auth requisite pam_nologin.so
auth required pam_env.so
auth required pam_faillock.so preauth
auth sufficient pam_unix.so try_first_pass
auth required pam_google_authenticator.so nullok
auth required pam_faillock.so authfail
auth required pam_deny.so
account required pam_nologin.so
account include system-auth
account required pam_faillock.so
session required pam_selinux.so close
session required pam_loginuid.so
session optional pam_keyinit.so force revoke
session include system-auth
session required pam_selinux.so open
session optional pam_motd.so
EOF
print_success "Cockpit 2FA configuration completed"
}
# Configure Webmin for 2FA (if installed)
function configure_webmin_2fa() {
print_info "Checking for Webmin installation..."
local webmin_config="/etc/webmin/miniserv.conf"
if [[ -f "$webmin_config" ]]; then
print_info "Webmin found, configuring 2FA..."
# Stop webmin service
systemctl stop webmin || true
# Enable 2FA in Webmin configuration
sed -i 's/^twofactor_provider=.*/twofactor_provider=totp/' "$webmin_config" || \
echo "twofactor_provider=totp" >> "$webmin_config"
# Enable 2FA requirement
sed -i 's/^twofactor=.*/twofactor=1/' "$webmin_config" || \
echo "twofactor=1" >> "$webmin_config"
# Start webmin service
systemctl start webmin || true
print_success "Webmin 2FA configuration completed"
else
print_info "Webmin not found, skipping configuration"
fi
}
# Setup 2FA for users
function setup_user_2fa() {
print_info "Setting up 2FA for system users..."
local users=("localuser" "root")
for user in "${users[@]}"; do
if id "$user" &>/dev/null; then
print_info "Setting up 2FA for user: $user"
# Create 2FA setup script for user
cat > "/tmp/setup-2fa-$user.sh" << 'EOF'
#!/bin/bash
echo "Setting up Google Authenticator for user: $USER"
echo "Please follow the prompts to configure 2FA:"
echo "1. Answer 'y' to update your time-based token"
echo "2. Scan the QR code with your authenticator app"
echo "3. Save the backup codes in a secure location"
echo "4. Answer 'y' to the remaining questions for security"
echo ""
google-authenticator -t -d -f -r 3 -R 30 -W
EOF
chmod +x "/tmp/setup-2fa-$user.sh"
# Instructions for user setup
cat > "/home/$user/2fa-setup-instructions.txt" << EOF
TSYS Two-Factor Authentication Setup Instructions
==============================================
Your system has been configured for 2FA. To complete setup:
1. Install an authenticator app on your phone:
- Google Authenticator
- Authy
- Microsoft Authenticator
2. Run the setup command:
sudo /tmp/setup-2fa-$user.sh
3. Follow the prompts:
- Scan the QR code with your app
- Save the backup codes securely
- Answer 'y' to security questions
4. Test your setup:
- SSH to the server
- Enter your 6-digit code when prompted
IMPORTANT: Save backup codes in a secure location!
Without them, you may be locked out if you lose your phone.
For support, contact your system administrator.
EOF
chown "$user:$user" "/home/$user/2fa-setup-instructions.txt"
print_success "2FA setup prepared for user: $user"
else
print_warning "User $user not found, skipping"
fi
done
}
# Restart services
function restart_services() {
print_info "Restarting services..."
# Test SSH configuration
if sshd -t; then
systemctl restart sshd
print_success "SSH service restarted"
else
print_error "SSH configuration test failed"
return 1
fi
# Restart Cockpit if installed
if systemctl is-enabled cockpit.socket &>/dev/null; then
systemctl restart cockpit.socket
print_success "Cockpit service restarted"
fi
# Restart Webmin if installed
if systemctl is-enabled webmin &>/dev/null; then
systemctl restart webmin
print_success "Webmin service restarted"
fi
}
# Validation and testing
function validate_2fa_setup() {
print_info "Validating 2FA setup..."
# Check if Google Authenticator is installed
if command -v google-authenticator &>/dev/null; then
print_success "Google Authenticator installed"
else
print_error "Google Authenticator not found"
return 1
fi
# Check SSH configuration
if grep -q "AuthenticationMethods publickey,keyboard-interactive" "$SSH_CONFIG"; then
print_success "SSH 2FA configuration valid"
else
print_error "SSH 2FA configuration invalid"
return 1
fi
# Check PAM configuration
if grep -q "pam_google_authenticator.so" "$PAM_CONFIG_DIR/sshd"; then
print_success "PAM 2FA configuration valid"
else
print_error "PAM 2FA configuration invalid"
return 1
fi
# Check service status
if systemctl is-active sshd &>/dev/null; then
print_success "SSH service is running"
else
print_error "SSH service is not running"
return 1
fi
print_success "2FA validation completed successfully"
}
# Display final instructions
function show_final_instructions() {
print_header "2FA Setup Completed"
print_info "Two-Factor Authentication has been configured for:"
print_info "- SSH (requires key + 2FA token)"
print_info "- Cockpit web interface"
if [[ -f "/etc/webmin/miniserv.conf" ]]; then
print_info "- Webmin administration panel"
fi
print_warning "IMPORTANT: Complete user setup immediately!"
print_warning "1. Check /home/*/2fa-setup-instructions.txt for user setup"
print_warning "2. Run setup scripts for each user"
print_warning "3. Test 2FA before logging out"
print_info "Backup location: $BACKUP_DIR"
print_info "To disable 2FA, restore configurations from backup"
print_success "2FA setup completed successfully!"
}
# Main execution
function main() {
# Check if running as root
if [[ $EUID -ne 0 ]]; then
print_error "This script must be run as root"
exit 1
fi
# Execute setup steps
backup_configs
install_2fa_packages
configure_ssh_2fa
configure_pam_2fa
configure_cockpit_2fa
configure_webmin_2fa
setup_user_2fa
restart_services
validate_2fa_setup
show_final_instructions
}
# Run main function
main "$@"

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# TSYS Two-Factor Authentication Implementation Guide
## Overview
This guide provides complete instructions for implementing and managing two-factor authentication (2FA) on TSYS servers using Google Authenticator (TOTP).
## What This Implementation Provides
### Services Protected by 2FA
- **SSH Access:** Requires SSH key + 2FA token
- **Cockpit Web Interface:** Requires password + 2FA token
- **Webmin Administration:** Requires password + 2FA token (if installed)
### Security Features
- **Time-based One-Time Passwords (TOTP):** Standard 6-digit codes
- **Backup Codes:** Emergency access codes
- **Gradual Rollout:** Optional nullok mode for phased deployment
- **Configuration Backup:** Automatic backup of all configs
## Implementation Steps
### Step 1: Run the 2FA Setup Script
```bash
# Navigate to the security modules directory
cd ProjectCode/Modules/Security
# Run the 2FA setup script as root
sudo bash secharden-2fa.sh
```
### Step 2: Validate Installation
```bash
# Run 2FA validation tests
./Project-Tests/security/2fa-validation.sh
# Run specific 2FA security test
./Project-Tests/run-tests.sh security
```
### Step 3: Setup Individual Users
For each user that needs 2FA access:
```bash
# Check setup instructions
cat /home/username/2fa-setup-instructions.txt
# Run user setup script
sudo /tmp/setup-2fa-username.sh
```
### Step 4: Test 2FA Access
1. **Test SSH access** from another terminal
2. **Test Cockpit access** via web browser
3. **Test Webmin access** if installed
## User Setup Process
### Installing Authenticator Apps
Users need one of these apps on their phone:
- **Google Authenticator** (Android/iOS)
- **Authy** (Android/iOS)
- **Microsoft Authenticator** (Android/iOS)
- **1Password** (with TOTP support)
### Setting Up 2FA for a User
1. **Run setup script:**
```bash
sudo /tmp/setup-2fa-username.sh
```
2. **Follow prompts:**
- Answer "y" to update time-based token
- Scan QR code with authenticator app
- Save emergency backup codes securely
- Answer "y" to remaining security questions
3. **Test immediately:**
```bash
# Test SSH from another terminal
ssh username@server-ip
# You'll be prompted for 6-digit code
```
## Configuration Details
### SSH Configuration Changes
File: `/etc/ssh/sshd_config`
```
ChallengeResponseAuthentication yes
UsePAM yes
AuthenticationMethods publickey,keyboard-interactive
```
### PAM Configuration
File: `/etc/pam.d/sshd`
```
auth required pam_google_authenticator.so nullok
```
### Cockpit Configuration
File: `/etc/cockpit/cockpit.conf`
```
[WebService]
LoginTitle = TSYS Server Management
LoginTo = 300
RequireHost = true
[Session]
Banner = /etc/cockpit/issue.cockpit
IdleTimeout = 15
```
### Webmin Configuration
File: `/etc/webmin/miniserv.conf`
```
twofactor_provider=totp
twofactor=1
```
## Security Considerations
### Gradual vs Strict Enforcement
#### Gradual Enforcement (Default)
- Uses `nullok` option in PAM
- Users without 2FA can still log in
- Allows phased rollout
- Good for initial deployment
#### Strict Enforcement
- Remove `nullok` from PAM configuration
- All users must have 2FA configured
- Immediate security enforcement
- Risk of lockout if misconfigured
### Backup and Recovery
#### Emergency Access
- **Backup codes:** Generated during setup
- **Root access:** Can disable 2FA if needed
- **Console access:** Physical/virtual console bypasses SSH
#### Configuration Backup
- Automatic backup to `/root/backup/2fa-TIMESTAMP/`
- Includes all modified configuration files
- Can be restored if needed
## Troubleshooting
### Common Issues
#### 1. User Cannot Generate QR Code
```bash
# Ensure qrencode is installed
sudo apt-get install qrencode
# Re-run user setup
sudo /tmp/setup-2fa-username.sh
```
#### 2. SSH Connection Fails
```bash
# Check SSH service status
sudo systemctl status sshd
# Test SSH configuration
sudo sshd -t
# Check logs
sudo journalctl -u sshd -f
```
#### 3. 2FA Code Not Accepted
- **Check time synchronization** on server and phone
- **Verify app setup** - rescan QR code if needed
- **Try backup codes** if available
#### 4. Locked Out of Server
```bash
# Access via console (physical/virtual)
# Disable 2FA temporarily
sudo cp /root/backup/2fa-*/pam.d.bak/sshd /etc/pam.d/sshd
sudo systemctl restart sshd
```
### Debug Commands
```bash
# Check 2FA status
./Project-Tests/security/2fa-validation.sh
# Check SSH configuration
sudo sshd -T | grep -E "(Challenge|PAM|Authentication)"
# Check PAM configuration
cat /etc/pam.d/sshd | grep google-authenticator
# Check user 2FA status
ls -la ~/.google_authenticator
```
## Management and Maintenance
### Adding New Users
1. Ensure user account exists
2. Run setup script for new user
3. Provide setup instructions
4. Test access
### Removing User 2FA
```bash
# Remove user's 2FA configuration
sudo rm /home/username/.google_authenticator
# User will need to re-setup 2FA
```
### Disabling 2FA System-Wide
```bash
# Restore original configurations
sudo cp /root/backup/2fa-*/sshd_config.bak /etc/ssh/sshd_config
sudo cp /root/backup/2fa-*/pam.d.bak/sshd /etc/pam.d/sshd
sudo systemctl restart sshd
```
### Updating 2FA Configuration
```bash
# Re-run setup script
sudo bash secharden-2fa.sh
# Validate changes
./Project-Tests/security/2fa-validation.sh
```
## Best Practices
### Deployment Strategy
1. **Test in non-production** environment first
2. **Enable gradual rollout** (nullok) initially
3. **Train users** on 2FA setup process
4. **Test emergency procedures** before strict enforcement
5. **Monitor logs** for authentication issues
### Security Recommendations
- **Enforce strict mode** after successful rollout
- **Regular backup code rotation**
- **Monitor failed authentication attempts**
- **Document emergency procedures**
- **Regular security audits**
### User Training
- **Provide clear instructions**
- **Demonstrate setup process**
- **Explain backup code importance**
- **Test login process with users**
- **Establish support procedures**
## Monitoring and Logging
### Authentication Logs
```bash
# SSH authentication logs
sudo journalctl -u sshd | grep -i "authentication"
# PAM authentication logs
sudo journalctl | grep -i "pam_google_authenticator"
# Failed login attempts
sudo journalctl | grep -i "failed"
```
### Security Monitoring
- Monitor for repeated failed 2FA attempts
- Alert on successful logins without 2FA (during gradual rollout)
- Track user 2FA setup completion
- Monitor for emergency access usage
## Integration with Existing Systems
### LDAP/Active Directory
- 2FA works with existing authentication systems
- Users still need local 2FA setup
- Consider centralized 2FA solutions for large deployments
### Monitoring Systems
- LibreNMS: Will continue to work with SNMP
- Wazuh: Will log 2FA authentication events
- Cockpit: Enhanced with 2FA protection
### Backup Systems
- Ensure backup procedures account for 2FA
- Test restore procedures with 2FA enabled
- Document emergency access procedures
## Support and Resources
### Files Created by Setup
- `/tmp/setup-2fa-*.sh` - User setup scripts
- `/home/*/2fa-setup-instructions.txt` - User instructions
- `/root/backup/2fa-*/` - Configuration backups
### Validation Tools
- `./Project-Tests/security/2fa-validation.sh` - Complete 2FA validation
- `./Project-Tests/run-tests.sh security` - Security test suite
### Emergency Contacts
- System Administrator: [Contact Info]
- Security Team: [Contact Info]
- 24/7 Support: [Contact Info]
## Compliance and Audit
### Security Benefits
- Significantly reduces risk of unauthorized access
- Meets multi-factor authentication requirements
- Provides audit trail of authentication events
- Complies with security frameworks (NIST, ISO 27001)
### Audit Trail
- All authentication attempts logged
- 2FA setup events recorded
- Configuration changes tracked
- Emergency access documented
---
**Last Updated:** July 14, 2025
**Version:** 1.0
**Author:** TSYS Security Team