#!/bin/bash
# Football System Secure Boot Configuration
# Implements Secure Boot with proper key management

set -e

echo "Configuring Secure Boot..."

# ============================================================================
# SECURE BOOT KEY MANAGEMENT
# ============================================================================

# Create secure boot key directory
mkdir -p /etc/secure-boot/keys

# Generate Secure Boot keys if they don't exist
if [ ! -f /etc/secure-boot/keys/db.key ]; then
    echo "Generating Secure Boot keys..."
    
    # Create Platform Key (PK)
    openssl req -new -x509 -newkey rsa:2048 -nodes \
        -keyout /etc/secure-boot/keys/PK.key \
        -out /etc/secure-boot/keys/PK.crt \
        -days 3650 \
        -subj "/CN=Football Platform Key/C=US/ST=State/L=City/O=Organization"
    
    # Create Key Exchange Key (KEK)
    openssl req -new -x509 -newkey rsa:2048 -nodes \
        -keyout /etc/secure-boot/keys/KEK.key \
        -out /etc/secure-boot/keys/KEK.crt \
        -days 3650 \
        -subj "/CN=Football Key Exchange Key/C=US/ST=State/L=City/O=Organization"
    
    # Create Signature Database Key (db)
    openssl req -new -x509 -newkey rsa:2048 -nodes \
        -keyout /etc/secure-boot/keys/db.key \
        -out /etc/secure-boot/keys/db.crt \
        -days 3650 \
        -subj "/CN=Football Database Key/C=US/ST=State/L=City/O=Organization"
    
    # Create Key Revoke Database Key (dbx)
    openssl req -new -x509 -newkey rsa:2048 -nodes \
        -keyout /etc/secure-boot/keys/dbx.key \
        -out /etc/secure-boot/keys/dbx.crt \
        -days 3650 \
        -subj "/CN=Football Revoke Database Key/C=US/ST=State/L=City/O=Organization"
    
    echo "✅ Secure Boot keys generated"
fi

# Set proper permissions
chmod 600 /etc/secure-boot/keys/*.key
chmod 644 /etc/secure-boot/keys/*.crt
chmod 755 /etc/secure-boot/keys

# ============================================================================
# BOOTLOADER SIGNING
# ============================================================================

echo "Configuring bootloader signing..."

# Install required tools for Secure Boot
apt-get update -qq
apt-get install -y -qq \
    sbsigntool \
    efitools \
    efivar \
    shim-signed \
    grub-efi-amd64-signed

# Sign GRUB configuration
if [ -f /boot/efi/EFI/debian/grubx64.efi ]; then
    echo "Signing GRUB bootloader..."
    sbsign --key /etc/secure-boot/keys/db.key \
            --cert /etc/secure-boot/keys/db.crt \
            --output /boot/efi/EFI/debian/grubx64.signed.efi \
            /boot/efi/EFI/debian/grubx64.efi
    
    # Backup and replace unsigned bootloader
    mv /boot/efi/EFI/debian/grubx64.efi /boot/efi/EFI/debian/grubx64.efi.backup
    mv /boot/efi/EFI/debian/grubx64.signed.efi /boot/efi/EFI/debian/grubx64.efi
    
    echo "✅ GRUB bootloader signed"
fi

# Sign kernel if not already signed
for kernel in /boot/vmlinuz-*; do
    if [ -f "$kernel" ] && [ ! -f "${kernel}.signed" ]; then
        echo "Signing kernel $(basename $kernel)..."
        sbsign --key /etc/secure-boot/keys/db.key \
                --cert /etc/secure-boot/keys/db.crt \
                --output "${kernel}.signed" \
                "$kernel"
    fi
done

# ============================================================================
# GRUB CONFIGURATION FOR SECURE BOOT
# ============================================================================

echo "Configuring GRUB for Secure Boot..."

# Update GRUB configuration for Secure Boot
cat > /etc/grub.d/40_secure_boot << 'EOF'
#!/bin/sh
exec tail -n +3 $0

# Secure Boot configuration for Football system
set superusers="root"
password_pbkdf2 root grub.pbkdf2.sha512.10000.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

# Enable Secure Boot verification
set check_signatures=enforce

# Restrict boot options
set trust_bootloader=true
set trust_module=true

# Disable editing of boot entries
set superusers="root"
export superusers

# Password protect editing and booting
password_pbkdf2 root 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