football/JOURNAL.md

KNEL-Football Development Journal

Important

: This file is APPEND-ONLY. Never delete or modify existing entries. Add new entries at the TOP (after this header) with date and context. This serves as long-term memory for AI agents and human developers.

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Entry 2026-02-20 (Session 6): Security Audit Findings Implementation

Context

External security audit dated 2026-02-20 identified several findings. Implemented fixes for FINDING-005, FINDING-006, FINDING-007, and FINDING-008 as directed by user.

Changes Implemented

1. FINDING-005: Argon2id KDF Configuration

   • Problem: Debian partman-crypto doesn't support preseed configuration for LUKS2 KDF type
   • LUKS2 defaults to PBKDF2, but PRD requires Argon2id for better security
   • Solution: Created post-install hook with user conversion script
   • New file: config/hooks/installed/luks-kdf-configure.sh
   • Components:
     • /usr/local/bin/convert-luks-kdf.sh - User-runnable conversion script
     • /etc/profile.d/knel-kdf-reminder.sh - Login reminder until conversion done
     • /var/backups/keys/README.txt - Conversion instructions

2. FINDING-006: Package Version Pinning

   • Problem: Docker packages unpinned, builds not fully reproducible
   • Solution: Pin all package versions in Dockerfile
   • Commit: bdf1f1b

3. FINDING-007: Test Coverage Enhancement

   • Problem: Test coverage for encryption parameters was incomplete
   • Solution: Added 16 comprehensive functional tests
   • File: tests/unit/encryption-validation_test.bats
   • Coverage:
     • Preseed.cfg verification (5 tests): cipher, keysize, format, method, erasure
     • encryption-setup.sh verification (5 tests): crypttab config, modules, type
     • Documentation accuracy (4 tests): README consistency
     • Integration tests (2 tests): cross-file consistency
   • Commit: 3e79064

4. FINDING-008: Username Standardization

   • Problem: User account inconsistency (football vs kneluser)
   • Solution: Standardized all hooks to use 'football' username
   • Commit: 589c148

Architectural Decision Records

ADR-010: User-Initiated KDF Conversion

Date: 2026-02-20 Status: Accepted

Context: Debian's partman-crypto (the installer component that handles disk encryption) does not support preseed configuration for the LUKS2 KDF type. LUKS2 defaults to PBKDF2, but the PRD requires Argon2id for better resistance to GPU/ASIC attacks.

Options Considered:

1. Post-install conversion hook (automatic)
2. User-initiated conversion script
3. Custom initramfs with Argon2id support
4. Accept PBKDF2 as adequate

Decision: Provide user-initiated conversion with login reminders.

Rationale:

• Automatic conversion during install is risky (could leave system unbootable)
• User-initiated approach allows verification before conversion
• Login reminder ensures users are aware of the security recommendation
• Clear documentation in /var/backups/keys/README.txt

Consequences:

• Users must manually run conversion after first boot
• System is still secure with PBKDF2, just not optimal
• Reminder appears on every login until conversion complete

ADR-011: Package Version Pinning for Reproducibility

Date: 2026-02-20 Status: Accepted

Context: Docker build used unpinned package versions, making builds non-reproducible. Same Dockerfile could produce different results at different times.

Decision: Pin all package versions in Dockerfile with explicit version numbers.

Rationale:

• Reproducible builds are critical for security verification
• Pinning ensures audit results match deployed systems
• Allows controlled updates when needed
• Standard practice for production Dockerfiles

Consequences:

• Requires manual version updates to get package fixes
• Build failures if specific version no longer available
• Must maintain version list

ADR-012: Multi-Layer Test Coverage for Encryption

Date: 2026-02-20 Status: Accepted

Context: Encryption parameters (cipher, keysize, format) defined in multiple files needed comprehensive validation to catch inconsistencies.

Decision: Create tests at three levels: source files, implementation files, and documentation.

Rationale:

• Tests at each layer catch different types of errors
• Preseed.cfg tests verify installer configuration
• encryption-setup.sh tests verify runtime configuration
• Documentation tests ensure user-facing accuracy
• Integration tests verify consistency across files

Consequences:

• 16 additional tests to maintain
• Changes to encryption params must update multiple test files
• High confidence in encryption configuration correctness

ADR-013: Single Username Convention

Date: 2026-02-20 Status: Accepted

Context: Codebase had inconsistent username references (football vs kneluser), causing potential runtime failures in hooks.

Decision: Standardize on 'football' as the primary user account name.

Rationale:

• Consistent with PRD specification
• Reduces cognitive load for maintainers
• Eliminates potential for hooks targeting wrong user
• 'football' is the project name, easy to remember

Consequences:

• All hooks and scripts use 'football' consistently
• If username needs to change, single grep/replace

Lessons Learned

1. Debian Installer Limitations

   • partman-crypto has limited preseed options
   • Not all LUKS2 features are configurable during install
   • Workaround: post-install configuration for advanced options

2. Test Coverage Layers

   • Testing source files alone isn't enough
   • Test implementation files AND documentation
   • Integration tests catch cross-file inconsistencies

3. Username Consistency

   • Simple string mismatches can cause runtime failures
   • Grep entire codebase before standardizing names
   • Add to coding standards for future reference

Commits

589c148 fix: standardize username to 'football' in all hooks (FINDING-008)
bdf1f1b fix: pin all package versions for reproducible builds (FINDING-006)
5b01cfd feat: add Argon2id KDF configuration for LUKS2 (FINDING-005)
3e79064 test: add comprehensive encryption parameter validation (FINDING-007)

Verification

./run.sh lint    # Zero warnings
./run.sh test    # All tests pass
./run.sh iso     # ISO builds successfully

---

Entry 2026-02-19 (Session 5): Critical Bug Fixes

Context

Resumed session after context overflow. Deep orientation revealed critical bugs in security-hardening.sh hook that were blocking FIM and SSH client configuration.

Changes Implemented

1. Bug Fix: Function Name Mismatch

   • config/hooks/live/security-hardening.sh:19 called configure_ssh
   • But src/security-hardening.sh defines configure_ssh_client
   • Fixed: Changed hook to call configure_ssh_client

2. Bug Fix: Missing FIM Call

   • configure_fim function existed in src/security-hardening.sh
   • But hook was never calling it
   • Fixed: Added configure_fim call to hook

Root Cause Analysis

Commit 0807611 "feat: add FIM, comprehensive audit logging, SSH client-only" added functions to src/security-hardening.sh but the corresponding hook was either:

• Not updated to call new functions (configure_fim)
• Calling wrong function name (configure_ssh vs configure_ssh_client)

This is a common pattern in codebase consolidation: when adding features to source files, remember to update ALL callers (hooks, scripts, tests).

Lessons Learned

1. Cross-Reference Source and Callers

   • When adding functions, search for ALL callers
   • grep -r function_name config/ to find hooks
   • Test execution paths, not just function existence

2. Documentation vs Reality Gap

   • JOURNAL.md said "FIM ADDED" but hook never called it
   • STATUS.md said "SSH client-only CONFIGURED" but wrong function name
   • Lesson: Verify code execution, not just code presence

Verification

./run.sh lint    # ✅ Zero warnings
./run.sh test    # ✅ 92 pass, 19 skip (VM tests)

Action Items

1. Rebuild ISO with bug fixes (in progress)
2. Update STATUS.md with accurate state
3. Consider adding hook validation tests

⚠️ PERMANENT LESSONS FOR FUTURE SESSIONS

These mistakes have happened multiple times. DO NOT repeat them.

1. When Adding/Modifying Functions: ALWAYS Update All Callers

   • Pattern: Function added to src/*.sh but hook in config/hooks/ not updated
   • Prevention: After editing src/security-hardening.sh, immediately run:

     grep -r "configure_ssh\|configure_fim\|configure_audit" config/hooks/
     

   • Test: Run ./run.sh test before committing - don't just assume it works

2. Documentation Claims Must Match Code Reality

   • Pattern: JOURNAL says "ADDED" but hook never calls the function
   • Prevention: After implementing a feature, verify execution path:

     # For each new function in src/:
     # 1. Find where it should be called
     # 2. Add the call
     # 3. Test that it runs
     

   • Never trust docs without code verification

3. Cross-Reference Before Committing

   • This project has: src/*.sh → config/hooks/**/*.sh → executed during build
   • Any change to source files requires checking ALL downstream callers
   • Use grep -r "function_name" . liberally

---

Entry 2026-02-17 (Session 4): Script Consolidation

Context

Continued session focused on consolidating all top-level scripts into run.sh as the single entry point. Merged test-iso.sh (344 lines) and monitor-build.sh (43 lines) into run.sh.

Changes Implemented

1. Script Consolidation

   • Merged test-iso.sh VM testing framework into run.sh
   • Merged monitor-build.sh build monitoring into run.sh
   • Deleted test-iso.sh and monitor-build.sh
   • run.sh now ~500+ lines, single entry point for all operations

2. New run.sh Commands

   ./run.sh monitor [secs]          # Monitor build progress
   ./run.sh test:iso check          # Check VM testing prerequisites
   ./run.sh test:iso create         # Create and start test VM
   ./run.sh test:iso console        # Connect to VM console
   ./run.sh test:iso status         # Show VM status
   ./run.sh test:iso destroy        # Destroy VM and cleanup
   ./run.sh test:iso boot-test      # Run automated boot test
   ./run.sh test:iso secure-boot    # Test Secure Boot
   ./run.sh test:iso fde-test       # Test FDE passphrase prompt
   

3. Test Updates

   • Updated tests/system/boot_test.bats to test run.sh instead of test-iso.sh
   • Updated skip messages in fde_test.bats and secureboot_test.bats

4. ISO Rebuild

   • Built successfully at 15:19 CST (449 MB)
   • Checksums verified (SHA256, MD5)

Architectural Decision Records

ADR-009: Single Entry Point (run.sh)

Date: 2026-02-17 Status: Accepted

Context: Multiple top-level scripts (run.sh, test-iso.sh, monitor-build.sh) caused fragmentation and made the project harder to navigate.

Decision: Consolidate all scripts into run.sh as the single entry point.

Rationale:

• Simpler user experience - one command to remember
• Consistent interface for all operations
• Easier to maintain and test
• Follows Unix philosophy of doing one thing well

Consequences:

• run.sh is larger (~500 lines) but well-organized
• All functionality accessible via subcommands
• Deleted scripts: test-iso.sh, monitor-build.sh

Lessons Learned

1. VM Testing Requires libvirt Group

   • virt-install fails if user not in libvirt group
   • QEMU fallback works but virt-install preferred for libvirt integration
   • Fix: sudo usermod -aG libvirt $USER then logout/login

2. Test Updates Required After Script Moves

   • When moving/deleting scripts, grep for all references
   • Tests in tests/system/ referenced test-iso.sh directly
   • Updated to use run.sh test:iso commands

Files Changed

File	Action
run.sh	Merged test-iso.sh and monitor-build.sh
test-iso.sh	DELETED
monitor-build.sh	DELETED
tests/system/boot_test.bats	Updated to test run.sh
tests/system/fde_test.bats	Updated skip message
tests/system/secureboot_test.bats	Updated skip message
STATUS.md	Updated status to COMPLETE
JOURNAL.md	This entry

Commit

d9f2f02 refactor: consolidate test-iso.sh and monitor-build.sh into run.sh

---

Entry 2026-02-17 (Session 3): Project Re-Orientation

Context

New session start. User requested deep project review and orientation. Reviewed git logs, STATUS.md, JOURNAL.md, and current system state.

Current State Assessment

1. ISO Status: STALE

   • Built: 2026-02-17 10:50
   • 6 commits since build (FIM, audit, SSH client-only, shellcheck fixes)
   • Missing features: AIDE FIM, comprehensive auditd, SSH client-only
   • Rebuild required to include recent security features

2. Test Suite: HEALTHY

   • 111 tests total, 92 pass, 19 skip (VM-required)
   • Skip reasons: VM not running, requires manual verification
   • Categories: unit (12), integration (6), security (44), system (47)
   • Zero failures, zero shellcheck warnings

3. Compliance: IN PROGRESS

   • CIS 1.4 (FIM): Code ready, not in ISO
   • CIS 5.2 (SSH): Code ready, not in ISO
   • CIS 6.2 (Audit): Code ready, not in ISO
   • NIST/FedRAMP/CMMC: Same status - config ready, needs rebuild

4. Blockers:

   • User NOT in libvirt group (blocks VM testing)
   • ISO outdated (blocks runtime verification)

Architecture Review

KNEL-Football OS (this project)
    │ WireGuard (outbound only)
    ▼
Privileged Access Workstation
    │ Direct access
    ▼
Tier0 Infrastructure

Key design principle: No inbound services. SSH client, RDP client, WireGuard client only.

Security Features Implemented (Code)

Feature	File	Status
Full Disk Encryption	config/hooks/installed/encryption-*.sh	✅ Code ready
Password Policy	src/security-hardening.sh	✅ Code ready
Firewall (nftables)	config/hooks/live/firewall-setup.sh	✅ Code ready
FIM (AIDE)	config/hooks/live/aide-setup.sh	✅ Code ready
Audit Logging	config/hooks/live/audit-logging.sh	✅ Code ready
SSH Client-Only	config/hooks/live/ssh-client-only.sh	✅ Code ready
WiFi/Bluetooth Block	config/hooks/live/security-hardening.sh	✅ Code ready

Key Files to Understand

• run.sh - Main entry point for all operations
• AGENTS.md - Agent behavior guidelines (READ FIRST)
• STATUS.md - Manager status report
• JOURNAL.md - This file - AI memory
• PRD.md - Product requirements
• config/preseed.cfg - Debian installer configuration
• config/hooks/live/ - Runtime configuration hooks
• tests/ - BATS test suite

Open Action Items (from STATUS.md)

1. Rebuild ISO with new security features
2. Logout/login for libvirt access (user action)
3. Run VM boot tests after ISO rebuild
4. Remove hardcoded passwords from preseed.cfg
5. Consider Secure Boot implementation

Session Decision

Next step: Rebuild ISO to include FIM, audit logging, SSH client-only changes. This is a 60-90 minute build. User should decide if they want to start it now.

ADR-008: ISO Rebuild Priority

Date: 2026-02-17 Status: Proposed

Context: 6 commits with security features made since last ISO build. Need to decide whether to rebuild now or continue development.

Options:

1. Rebuild now - validates features, enables runtime testing
2. Continue development - batch more changes, rebuild later

Recommendation: Rebuild now. Features are ready, compliance requires verification.

---

Entry 2026-02-17 (Session 2): FIM, Audit, SSH Security Enhancements

Context

Continued session focused on closing compliance gaps for CIS, FedRAMP, and CMMC. Added File Integrity Monitoring (FIM), comprehensive audit logging, and SSH client-only configuration. Resolved all shellcheck warnings and added git safety documentation.

Changes Implemented

1. File Integrity Monitoring (AIDE)

   • Added config/hooks/live/aide-setup.sh
   • Configured to monitor /etc, /bin, /sbin, /usr/bin, /usr/sbin, /lib
   • Initializes database on first boot
   • Compliance: CIS 1.4, FedRAMP AU-7, CMMC AU.3.059

2. Comprehensive Audit Logging

   • Added config/hooks/live/audit-logging.sh
   • Monitors: auth, access, modification, privilege, session events
   • Log retention: 90 days
   • Compliance: CIS 6.2, FedRAMP AU-2, CMMC AU.2.042

3. SSH Client-Only Configuration

   • Modified config/hooks/live/ssh-client-only.sh
   • Disabled sshd service, removed server package
   • SSH client tools remain for outbound connections
   • Compliance: CIS 5.2, NIST 800-53 IA-5, CMMC IA.2.078

4. Shellcheck Fixes

   • Resolved all warnings in shell scripts
   • SC2120/SC2119: Functions called without arguments (correct behavior)
   • SC1091: Source files exist at runtime
   • SC2034: Variables used in templates
   • Result: ZERO shellcheck warnings

5. Git Safety Rules

   • Added to AGENTS.md:
     • Quote all path arguments (handles spaces)
     • Use non-interactive rebase (git rebase --no-interactive not available, use -i with care)
     • Destructive operations require user confirmation

Test Coverage Update

Before Session: 31 tests
After Session:  111 tests (+80)

Unit Tests:        12 → 12 (unchanged)
Integration Tests:  6 →  6 (unchanged)
Security Tests:    13 → 44 (+31)
System Tests:       0 → 47 (+47, new category)

Architectural Decision Records

ADR-005: File Integrity Monitoring via AIDE

Date: 2026-02-17 Status: Accepted

Context: Need file integrity monitoring for compliance (CIS 1.4, FedRAMP AU-7).

Decision: Use AIDE (Advanced Intrusion Detection Environment) with focused monitoring of critical system directories.

Rationale:

• AIDE is mature, well-supported on Debian
• Lightweight compared to commercial alternatives
• Meets multiple compliance requirements
• Database can be rebuilt if needed

Consequences:

• Initial database creation on first boot (minor delay)
• Regular checks recommended via cron
• False positives if system packages updated legitimately

ADR-006: Comprehensive Audit via auditd

Date: 2026-02-17 Status: Accepted

Context: Need comprehensive audit logging for CIS 6.2, FedRAMP AU-2.

Decision: Use auditd with rules for all major event categories.

Rationale:

• auditd is the Linux standard for audit logging
• Kernel-level monitoring (cannot be bypassed by userspace)
• Structured logs for analysis
• Meets multiple compliance requirements

Consequences:

• Increased log volume (manageable with rotation)
• Performance impact minimal on workstation workloads
• Log retention policy required (90 days set)

ADR-007: SSH Client-Only Mode

Date: 2026-02-17 Status: Accepted

Context: KNEL-Football should have no inbound services.

Decision: Remove SSH server, keep only client tools.

Rationale:

• Reduces attack surface significantly
• Aligns with "outbound only" security model
• User can SSH out to other systems as needed
• No management via SSH (physical console only)

Consequences:

• No remote administration via SSH
• Must use physical console for management
• WireGuard outbound only, no inbound connections

Lessons Learned

1. Shellcheck Warnings Can Be Misleading

   • SC2120/SC2119 warnings were false positives
   • Functions intentionally don't use arguments (generate static config)
   • Used # shellcheck disable sparingly, documented why

2. Compliance Requirements Overlap

   • CIS 1.4 (FIM) → FedRAMP AU-7 → CMMC AU.3.059
   • Single AIDE implementation satisfies all three
   • Document compliance mappings clearly

3. Test Framework Scales Well

   • Adding 80 new tests was straightforward
   • BATS + custom helpers pattern works
   • System tests for VM boot require special handling (libvirt)

Action Items for Future Sessions

1. Rebuild ISO with new security features
2. Run VM boot tests after user logout/login for libvirt
3. Verify FDE runtime behavior in VM
4. Consider Secure Boot implementation
5. Update preseed.cfg to remove hardcoded passwords

---

Entry 2026-02-17 (Session 1): Project Assessment and Test Coverage Analysis

Context

Comprehensive project review after session handoff. User requested full orientation and 100% test coverage including VM boot tests, Secure Boot, and FDE runtime tests.

Insights

1. Test Infrastructure Pattern

   • BATS tests work well for static analysis but lack runtime verification
   • Current tests validate file existence and content, not actual behavior
   • Missing entire category: system/integration tests that boot the ISO

2. Docker-Only Workflow is Correct

   • All build/test commands run inside Docker containers
   • Prevents host system pollution
   • Makes builds reproducible across environments
   • Volumes: /workspace (read-only), /build (temp), /output (artifacts)

3. Shellcheck Warnings Are Non-Critical

   • SC2120/SC2119: Functions don't use arguments but called without "$@"
   • SC1091: Source files not available during shellcheck (exist at runtime)
   • Pattern: Functions generate config, don't need arguments

Architectural Decision Records (ADRs)

ADR-001: Two-Tier Security Model

Date: 2026-01-28 (documented 2026-02-17) Status: Accepted

Context: How should KNEL-Football OS access tier0 infrastructure?

Decision: KNEL-Football OS is a secure remote terminal, NOT direct tier0 access. Flow: KNEL-Football OS → WireGuard VPN → Privileged Access Workstation → Tier0

Rationale:

• Defense in depth - multiple hops before tier0
• Compromise of laptop doesn't directly expose tier0
• WireGuard provides encrypted tunnel
• Physical workstation adds another security layer

Consequences:

• Network configuration focuses on WireGuard only
• WiFi/Bluetooth permanently disabled
• SSH configured for key-based auth only

ADR-002: Docker-Only Build Environment

Date: 2026-01-28 (documented 2026-02-17) Status: Accepted

Context: How should ISO builds be executed?

Decision: ALL build operations run inside Docker containers. No host modifications.

Rationale:

• Reproducible builds across different host systems
• No pollution of host environment
• Easy cleanup (just remove containers/images)
• CI/CD friendly

Consequences:

• run.sh wraps all commands with docker run
• ISO build requires --privileged for loop devices
• Output artifacts copied via volume mounts

ADR-003: LUKS2 Over LUKS1

Date: 2026-01-28 (documented 2026-02-17) Status: Accepted

Context: Which disk encryption format to use?

Decision: Use LUKS2 with Argon2id KDF, AES-256-XTS cipher, 512-bit key.

Rationale:

• LUKS2 is newer, more secure format
• Argon2id resists GPU/ASIC attacks better than PBKDF2
• AES-XTS is NIST-approved for disk encryption
• 512-bit key provides security margin

Consequences:

• Modern systems only (older grub may not support)
• Boot requires passphrase entry
• No recovery without passphrase

ADR-004: BATS Without External Libraries

Date: 2026-01-28 (documented 2026-02-17) Status: Accepted

Context: BATS test framework libraries were failing to load.

Decision: Remove bats-support, bats-assert, bats-file dependencies. Use custom assertion functions in tests/test_helper/common.bash.

Rationale:

• External library loading was unreliable
• Custom functions provide same functionality
• Fewer dependencies = fewer failure points
• Easier to debug when tests fail

Consequences:

• Custom assertions must be maintained
• Tests don't benefit from upstream library fixes
• But: simpler, more predictable behavior

Patterns Observed

1. Hook Organization

   • config/hooks/live/ - Runs during live session (before install)
   • config/hooks/installed/ - Runs after installation
   • Pattern: Source shared functions, call main function

2. Script Structure

   #!/bin/bash
   set -euo pipefail
   # Functions that generate config
   main() { ... }
   # Call main if script executed directly
   

3. Test Structure

   #!/usr/bin/env bats
   @test "description" {
       # Setup
       # Exercise
       # Verify
   }
   

Lessons Learned

1. test:iso Command Was Broken

   • run.sh:172 references deleted test-iso.sh
   • Commit c1505a9 removed obsolete scripts including test-iso.sh
   • But run.sh was not updated to remove the command
   • Lesson: When removing files, search for all references

2. Preseed.cfg Has Hardcoded Passwords

   • Lines 28-31 contain default passwords
   • These are installer defaults, should be changed on first boot
   • Security risk if users don't change them
   • Lesson: Consider using installer prompts instead

3. Test Coverage Claim vs Reality

   • Documentation claimed 95% coverage
   • Reality: 100% static analysis, 0% runtime/VM testing
   • Lesson: Be precise about what "coverage" means

Action Items for Future Sessions

1. Implement VM boot tests using libvirt
2. Add Secure Boot support (shim-signed, grub-efi-amd64-signed)
3. Create runtime FDE passphrase prompt tests
4. Remove hardcoded passwords from preseed.cfg
5. Fix shellcheck warnings (low priority, non-critical)

---

Entry 2026-01-28: Initial Build Completion

Context

First successful ISO build completed after 72 minutes.

Insights

1. Live-Build Stages

   • bootstrap: Downloads base system (longest stage)
   • chroot: Installs packages, runs hooks
   • binary: Creates ISO filesystem
   • checksum: Generates SHA256/MD5

2. Build Time Breakdown

   • Total: ~72 minutes
   • bootstrap: ~40 minutes (network dependent)
   • chroot: ~20 minutes
   • binary: ~10 minutes

3. ISO Size

   • Final ISO: 450 MB
   • Includes: Debian base, IceWM, WireGuard, security tools
   • Reasonable size for secure workstation

Patterns

1. Docker Volume Strategy

   • /workspace mounted read-only (source code)
   • /build for intermediate files
   • /output for final artifacts
   • Prevents accidental modification of source

2. Checksum Generation

   • Generate both SHA256 and MD5
   • Name checksum files after ISO
   • Copy to output directory with ISO

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