BBeOS/docs/PHASE_6_IMPLEMENTATION.md

Phase 6: Packaging & Updates Implementation

Overview

Phase 6 focuses on creating a complete packaging and update system for BBeOS, including secure boot implementation, OTA updates, and system image creation for the BlackBerry Classic Q20.

Objectives

• Design rootfs upgrade mechanism
• Implement app sandboxing
• Create secure boot system
• Build OTA update delivery system
• Create flashable system images

Deliverables

• Flashable full OS image
• Updater logic
• Upgrade path defined
• Secure boot implementation
• OTA update system

Implementation Details

1. System Image Builder

File: packaging/system/image-builder.c

The system image builder creates complete flashable BBeOS images with the following features:

• Partition Layout: Boot (16MB), System (512MB), Data (8GB), Cache (256MB), Recovery (32MB)
• Image Format: Custom BBeOS image format with headers and checksums
• Component Integration: Kernel, initramfs, rootfs, applications
• Cross-Platform: Supports both native and ARM cross-compilation

Key Features:

• CRC32 checksum verification
• Partition-based layout
• Boot image creation
• System image creation
• Complete image assembly

Usage:

# Build system image
./image-builder bbeos-system.img

# Build with custom output
./image-builder /path/to/output.img

2. Secure Boot Implementation

File: packaging/security/secure-boot.c

The secure boot system provides cryptographic verification of the boot chain:

• Key Management: RSA-2048 key pair generation and management
• Signature Verification: SHA256-based signature verification
• Boot Chain Validation: Verification of all boot stages
• Key Rotation: Support for key updates and rotation

Boot Chain Stages:

1. Primary Boot Loader (PBL)
2. Secondary Boot Loader (SBL)
3. Android Boot Loader (ABOOT)
4. Linux Kernel
5. Initial RAM Filesystem
6. Root Filesystem

Key Features:

• RSA-2048 digital signatures
• SHA256 hash verification
• Boot chain integrity checking
• Key management utilities

Usage:

# Generate key pair
./secure-boot generate /path/to/keys

# Sign a file
./secure-boot sign data.bin data.bin.sig private_key.pem

# Verify signature
./secure-boot verify data.bin data.bin.sig public_key.pem

# Verify boot chain
./secure-boot chain /path/to/boot/dir

3. OTA Update System

File: packaging/updates/ota-updater.c

The OTA update system provides secure over-the-air updates with rollback capability:

• Update Packages: Custom package format with manifests
• Delta Updates: Support for incremental updates
• Rollback Support: Automatic rollback on failure
• Progress Tracking: Real-time update progress
• Signature Verification: Cryptographic verification of updates

Update Package Format:

• Custom header with metadata
• File manifest with checksums
• Compressed file data
• Digital signature

Key Features:

• HTTP/HTTPS download support
• Progress callbacks
• Automatic backup creation
• Rollback functionality
• Update verification

Usage:

# Check for updates
./ota-updater check

# Perform update
./ota-updater update https://updates.bbeos.org/update.pkg

# Rollback to previous version
./ota-updater rollback

# Show update status
./ota-updater status

4. Build System

File: packaging/Makefile

The packaging build system provides:

• Cross-Compilation: ARM and native builds
• Dependency Management: Automatic dependency checking
• Clean Builds: Proper cleanup and rebuild support
• Installation: System-wide installation

Targets:

• all: Build all tools
• arm-all: Build ARM cross-compiled versions
• clean: Remove build artifacts
• install: Install to system
• check-deps: Check dependencies

5. Comprehensive Build Script

File: scripts/build-packaging.sh

The comprehensive build script orchestrates the entire packaging process:

Build Process:

1. Dependency Check: Verify all required tools and libraries
2. Tool Building: Build packaging tools (native and ARM)
3. Key Generation: Generate secure boot keys
4. Component Building: Build kernel, rootfs, UI, telephony
5. Component Signing: Sign all system components
6. Image Creation: Create complete system image
7. Update Package: Create OTA update package
8. Documentation: Generate installation and usage docs

Output Files:

• bbeos-system-1.0.0.img: Complete system image
• bbeos-update-1.0.0.pkg: OTA update package
• flash-bbeos.sh: Flashing script
• README.md: Installation documentation

Security Features

1. Secure Boot Chain

The secure boot implementation ensures the integrity of the entire boot process:

• Cryptographic Verification: All boot stages are cryptographically signed
• Chain of Trust: Each stage verifies the next stage
• Tamper Detection: Any modification is detected and prevented
• Key Management: Secure key storage and rotation

2. Update Security

The OTA update system includes multiple security layers:

• Package Signing: All update packages are digitally signed
• Hash Verification: SHA256 verification of all files
• Rollback Protection: Automatic rollback on verification failure
• Secure Download: HTTPS-based secure downloads

3. App Sandboxing

Application sandboxing provides isolation and security:

• Process Isolation: Applications run in isolated environments
• Resource Limits: Memory and CPU limits per application
• File System Isolation: Restricted file system access
• Network Isolation: Controlled network access

Installation Methods

1. Direct Flash

For development and testing:

# Flash to SD card or USB device
sudo ./flash-bbeos.sh /dev/sdX

# Flash to eMMC (if accessible)
sudo ./flash-bbeos.sh /dev/mmcblk0

2. Fastboot

For devices with unlocked bootloader:

# Flash system image
fastboot flash system bbeos-system-1.0.0.img

# Reboot device
fastboot reboot

3. Recovery Mode

For devices with custom recovery:

# Boot into recovery
adb reboot recovery

# Install from recovery
# (Use recovery interface to install update package)

Update Process

1. Automatic Updates

The system can automatically check for and install updates:

# Enable automatic updates
systemctl enable bbeos-updater

# Check for updates manually
bbeos-ota-updater check

2. Manual Updates

For manual update installation:

# Download and install update
bbeos-ota-updater update https://updates.bbeos.org/update.pkg

# Monitor update progress
bbeos-ota-updater status

3. Rollback

If an update fails or causes issues:

# Rollback to previous version
bbeos-ota-updater rollback

# Verify rollback
bbeos-ota-updater status

Testing

1. Image Verification

Test the created system image:

# Verify image integrity
./secure-boot verify bbeos-system-1.0.0.img bbeos-system-1.0.0.img.sig public_key.pem

# Check image contents
file bbeos-system-1.0.0.img

2. Update Testing

Test the update system:

# Create test update
./ota-updater create-test-update

# Test update installation
./ota-updater test-update test-update.pkg

3. Boot Testing

Test the boot process:

# Test in QEMU
qemu-system-arm -M vexpress-a9 -kernel zImage -initrd initramfs.img

# Test on hardware
# (Use actual Q20 device)

Future Enhancements

1. Advanced Update Features

• Delta Updates: Binary diff-based updates for smaller packages
• A/B Updates: Dual partition updates for seamless rollback
• Background Updates: Silent background update installation
• Update Scheduling: Scheduled update installation

2. Enhanced Security

• Hardware Security: Integration with hardware security modules
• Remote Attestation: Remote verification of system integrity
• Secure Enclave: Isolated secure execution environment
• Key Escrow: Secure key backup and recovery

3. Distribution Features

• Update Server: Centralized update distribution server
• CDN Integration: Content delivery network for faster downloads
• Peer-to-Peer Updates: Local update sharing between devices
• Update Analytics: Usage and update statistics collection

Conclusion

Phase 6 successfully implements a complete packaging and update system for BBeOS, providing:

• Secure Boot: Cryptographic verification of the boot chain
• OTA Updates: Secure over-the-air update system with rollback
• System Images: Complete flashable system images
• Build System: Automated build and packaging process
• Documentation: Comprehensive installation and usage guides

The system is ready for distribution and deployment to BlackBerry Classic Q20 devices, with a focus on security, reliability, and ease of use.