makiolaj/Laborpruefung
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

init

Browse Source
This commit is contained in:
Jean-Luc Makiola
2026-01-29 14:26:02 +01:00
commit 5f3c516f7b
6 changed files with 1490 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

455
break_server.sh Executable file
View File

@@ -0,0 +1,455 @@
#!/bin/bash
# ============================================================
# PRACTICE EXAM - BREAK SERVER SCRIPT
# Betriebssysteme und Netzwerke - 45 Minute Practice Test
# ============================================================
# This script intentionally introduces problems for students
# to diagnose and fix during the practice exam
# ============================================================
# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
CYAN='\033[0;36m'
MAGENTA='\033[0;35m'
NC='\033[0m' # No Color
print_status() {
echo -e "${BLUE}[*]${NC} $1"
}
print_success() {
echo -e "${GREEN}[✓]${NC} $1"
}
print_warning() {
echo -e "${YELLOW}[!]${NC} $1"
}
print_error() {
echo -e "${RED}[✗]${NC} $1"
}
print_break() {
echo -e "${MAGENTA}[BREAK]${NC} $1"
}
# Check if running as root
if [[ $EUID -ne 0 ]]; then
print_error "This script must be run as root (use sudo)"
exit 1
fi
# Detect PHP version
PHP_VERSION=$(php -r "echo PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION;" 2>/dev/null || echo "8.3")
# ============================================================
# PROBLEM 1: Nginx Configuration Error (company.local)
# Category: Web Server Configuration
# ============================================================
break_nginx_config() {
print_break "Breaking company.local (Nginx config error)..."
# Introduce a syntax error - remove semicolon
cat > /etc/nginx/sites-available/company.local << 'EOF'
server {
listen 80;
server_name company.local;
root /var/www/company;
index index.html
location / {
try_files $uri $uri/ =404;
}
error_log /var/log/nginx/company_error.log;
access_log /var/log/nginx/company_access.log;
}
EOF
# Try to reload nginx (will fail silently)
nginx -t > /dev/null 2>&1 || true
systemctl reload nginx 2>/dev/null || systemctl restart nginx 2>/dev/null || true
print_success "Problem 1 active: company.local has a configuration error"
}
# ============================================================
# PROBLEM 2: File Permissions (shop.local)
# Category: File System Permissions
# ============================================================
break_file_permissions() {
print_break "Breaking shop.local (wrong file permissions)..."
# Remove all permissions from the website directory
chmod 000 /var/www/shop/index.html
print_success "Problem 2 active: shop.local has permission issues"
}
# ============================================================
# PROBLEM 3: PHP-FPM Service Stopped (api.local)
# Category: Service Management (systemd)
# ============================================================
break_php_service() {
print_break "Breaking api.local (PHP-FPM service stopped)..."
# Stop and disable PHP-FPM
systemctl stop php${PHP_VERSION}-fpm
systemctl disable php${PHP_VERSION}-fpm 2>/dev/null
print_success "Problem 3 active: API returns 502 Bad Gateway (PHP-FPM stopped)"
}
# ============================================================
# PROBLEM 4: Firewall Blocking Docker App
# Category: Firewall (UFW)
# ============================================================
break_firewall() {
print_break "Breaking Docker app access (firewall block)..."
# Block port 8888
ufw delete allow 8888/tcp > /dev/null 2>&1
ufw deny 8888/tcp > /dev/null 2>&1
print_success "Problem 4 active: Docker app unreachable (port blocked)"
}
# ============================================================
# PROBLEM 5: MySQL User Configuration
# Category: Database Administration
# ============================================================
break_mysql_user() {
print_break "Breaking MySQL database access..."
# Drop the working user and create one bound to wrong IP
mysql -e "DROP USER IF EXISTS 'webuser'@'localhost';"
mysql -e "CREATE USER 'webuser'@'10.0.0.1' IDENTIFIED BY 'WebPass123!';"
mysql -e "GRANT ALL PRIVILEGES ON practicedb.* TO 'webuser'@'10.0.0.1';"
mysql -e "FLUSH PRIVILEGES;"
print_success "Problem 5 active: MySQL connection refused (wrong host binding)"
}
# ============================================================
# RESET FUNCTIONS
# ============================================================
reset_nginx_config() {
print_status "Resetting company.local configuration..."
cat > /etc/nginx/sites-available/company.local << 'EOF'
server {
listen 80;
server_name company.local;
root /var/www/company;
index index.html;
location / {
try_files $uri $uri/ =404;
}
error_log /var/log/nginx/company_error.log;
access_log /var/log/nginx/company_access.log;
}
EOF
nginx -t > /dev/null 2>&1 && systemctl reload nginx
print_success "company.local restored"
}
reset_file_permissions() {
print_status "Resetting shop.local permissions..."
chmod 644 /var/www/shop/index.html
chown www-data:www-data /var/www/shop/index.html
print_success "shop.local permissions restored"
}
reset_php_service() {
print_status "Resetting PHP-FPM service..."
systemctl enable php${PHP_VERSION}-fpm
systemctl start php${PHP_VERSION}-fpm
print_success "PHP-FPM service restored"
}
reset_firewall() {
print_status "Resetting firewall rules..."
ufw delete deny 8888/tcp > /dev/null 2>&1
ufw allow 8888/tcp > /dev/null 2>&1
print_success "Firewall rules restored"
}
reset_mysql_user() {
print_status "Resetting MySQL user..."
mysql -e "DROP USER IF EXISTS 'webuser'@'10.0.0.1';"
mysql -e "DROP USER IF EXISTS 'webuser'@'localhost';"
mysql -e "CREATE USER 'webuser'@'localhost' IDENTIFIED BY 'WebPass123!';"
mysql -e "GRANT ALL PRIVILEGES ON practicedb.* TO 'webuser'@'localhost';"
mysql -e "FLUSH PRIVILEGES;"
print_success "MySQL user restored"
}
reset_all() {
echo ""
print_status "Resetting all problems..."
echo ""
reset_nginx_config
reset_file_permissions
reset_php_service
reset_firewall
reset_mysql_user
# Restart services
systemctl restart nginx
echo ""
print_success "All problems have been reset!"
echo ""
}
# ============================================================
# START EXAM (ALL PROBLEMS)
# ============================================================
start_exam() {
echo ""
echo -e "${RED}============================================================${NC}"
echo -e "${RED} STARTING PRACTICE EXAM - 45 MINUTES${NC}"
echo -e "${RED}============================================================${NC}"
echo ""
print_warning "Introducing 5 problems to the server..."
echo ""
break_nginx_config
break_file_permissions
break_php_service
break_firewall
break_mysql_user
# Restart nginx to apply changes
systemctl restart nginx 2>/dev/null || true
echo ""
echo -e "${RED}============================================================${NC}"
echo ""
print_warning "EXAM STARTED! You have 45 minutes to fix all issues."
echo ""
echo "The following services should be working when you're done:"
echo ""
echo " Task 1: http://company.local - Company Portal"
echo " Task 2: http://shop.local - Online Shop"
echo " Task 3: http://api.local:8080 - REST API"
echo " Task 4: http://localhost:8888 - Docker App"
echo " Task 5: mysql -u webuser -p'WebPass123!' practicedb"
echo ""
echo "Use './verify.sh' to check your progress"
echo ""
echo -e "${RED}============================================================${NC}"
echo ""
}
# ============================================================
# VERIFICATION
# ============================================================
verify_all() {
echo ""
echo "============================================================"
echo " VERIFICATION RESULTS"
echo "============================================================"
echo ""
PASSED=0
FAILED=0
# Test company.local
echo -n "Task 1 - company.local: "
if curl -s -o /dev/null -w "%{http_code}" http://company.local 2>/dev/null | grep -q "200"; then
echo -e "${GREEN}PASS${NC}"
((PASSED++))
else
echo -e "${RED}FAIL${NC}"
((FAILED++))
fi
# Test shop.local
echo -n "Task 2 - shop.local: "
if curl -s http://shop.local 2>/dev/null | grep -q "Online Shop"; then
echo -e "${GREEN}PASS${NC}"
((PASSED++))
else
echo -e "${RED}FAIL${NC}"
((FAILED++))
fi
# Test API
echo -n "Task 3 - api.local:8080: "
if curl -s http://api.local:8080 2>/dev/null | grep -q "success"; then
echo -e "${GREEN}PASS${NC}"
((PASSED++))
else
echo -e "${RED}FAIL${NC}"
((FAILED++))
fi
# Test Docker app
echo -n "Task 4 - Docker app :8888: "
if curl -s http://localhost:8888 2>/dev/null | grep -q "Docker"; then
echo -e "${GREEN}PASS${NC}"
((PASSED++))
else
echo -e "${RED}FAIL${NC}"
((FAILED++))
fi
# Test MySQL
echo -n "Task 5 - MySQL connection: "
if mysql -u webuser -p'WebPass123!' practicedb -e "SELECT 1;" > /dev/null 2>&1; then
echo -e "${GREEN}PASS${NC}"
((PASSED++))
else
echo -e "${RED}FAIL${NC}"
((FAILED++))
fi
echo ""
echo "============================================================"
echo ""
echo -e "Results: ${GREEN}${PASSED} PASSED${NC} | ${RED}${FAILED} FAILED${NC}"
echo ""
if [ $FAILED -eq 0 ]; then
echo -e "${GREEN}Congratulations! All tasks completed successfully!${NC}"
else
echo -e "${YELLOW}Keep working - ${FAILED} task(s) still need to be fixed.${NC}"
fi
echo ""
echo "============================================================"
}
# ============================================================
# MAIN MENU
# ============================================================
show_menu() {
clear
echo ""
echo -e "${CYAN}============================================================${NC}"
echo -e "${CYAN} PRACTICE EXAM - BREAK SERVER MENU${NC}"
echo -e "${CYAN} Betriebssysteme und Netzwerke${NC}"
echo -e "${CYAN}============================================================${NC}"
echo ""
echo " INDIVIDUAL PROBLEMS:"
echo ""
echo " 1) Break company.local (Nginx config error)"
echo " 2) Break shop.local (File permissions)"
echo " 3) Break api.local (PHP-FPM service)"
echo " 4) Break Docker app (Firewall block)"
echo " 5) Break MySQL (User configuration)"
echo ""
echo " EXAM MODE:"
echo ""
echo " 6) START EXAM (All 5 problems - 45 minutes)"
echo ""
echo " UTILITIES:"
echo ""
echo " 7) Verify all services"
echo " 8) RESET all problems"
echo " 9) Reset specific problem"
echo ""
echo " 0) Exit"
echo ""
echo -e "${CYAN}============================================================${NC}"
echo ""
}
show_reset_menu() {
echo ""
echo " SELECT PROBLEM TO RESET:"
echo ""
echo " 1) Reset company.local"
echo " 2) Reset shop.local"
echo " 3) Reset api.local (PHP-FPM)"
echo " 4) Reset Docker app (Firewall)"
echo " 5) Reset MySQL user"
echo " 6) Back to main menu"
echo ""
}
# ============================================================
# MAIN LOOP
# ============================================================
while true; do
show_menu
read -p " Select option: " choice
case $choice in
1)
break_nginx_config
systemctl restart nginx 2>/dev/null || true
read -p "Press Enter to continue..."
;;
2)
break_file_permissions
read -p "Press Enter to continue..."
;;
3)
break_php_service
read -p "Press Enter to continue..."
;;
4)
break_firewall
read -p "Press Enter to continue..."
;;
5)
break_mysql_user
read -p "Press Enter to continue..."
;;
6)
start_exam
read -p "Press Enter to continue..."
;;
7)
verify_all
read -p "Press Enter to continue..."
;;
8)
reset_all
read -p "Press Enter to continue..."
;;
9)
show_reset_menu
read -p " Select problem to reset: " reset_choice
case $reset_choice in
1) reset_nginx_config ;;
2) reset_file_permissions ;;
3) reset_php_service ;;
4) reset_firewall ;;
5) reset_mysql_user ;;
6) continue ;;
*) print_error "Invalid option" ;;
esac
read -p "Press Enter to continue..."
;;
0)
echo ""
print_status "Goodbye!"
exit 0
;;
*)
print_error "Invalid option"
read -p "Press Enter to continue..."
;;
esac
done