mirror of
https://github.com/ivuorinen/f2b.git
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feat!: Go rewrite (#9)
* Go rewrite * chore(cr): apply suggestions Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Signed-off-by: Ismo Vuorinen <ismo@ivuorinen.net> * 📝 CodeRabbit Chat: Add NoOpClient to fail2ban and initialize when skip flag is true * 📝 CodeRabbit Chat: Fix malformed if-else structure and add no-op client for skip-only commands * 📝 CodeRabbit Chat: Fix malformed if-else structure and add no-op client for skip-only commands * fix(main): correct no-op branch syntax (#10) * chore(gitignore): ignore env and binary files (#11) * chore(config): remove indent_size for go files (#12) * feat(cli): inject version via ldflags (#13) * fix(security): validate filter parameter to prevent path traversal (#15) * chore(repo): anchor ignore for build artifacts (#16) * chore(ci): use golangci-lint action (#17) * feat(fail2ban): expose GetLogDir (#19) * test(cmd): improve IP mock validation (#20) * chore(ci): update golanglint * fix(ci): golanglint * fix(ci): correct args indentation in pr-lint workflow (#21) * fix(ci): avoid duplicate releases (#22) * refactor(fail2ban): remove test check from OSRunner (#23) * refactor(fail2ban): make log and filter dirs configurable (#24) * fix(ci): create single release per tag (#14) Signed-off-by: Ismo Vuorinen <ismo@ivuorinen.net> * chore(dev): add codex setup script (#27) * chore(lint): enable staticcheck (#26) * chore(ci): verify golangci config (#28) * refactor(cmd): centralize env config (#29) * chore(dev): add pre-commit config (#30) * fix(ci): disable cgo in cross compile (#31) * fix(ci): fail on formatting issues (#32) * feat(cmd): add context to logs watch (#33) * chore: fixes, roadmap, claude.md, linting * chore: fixes, linting * fix(ci): gh actions update, fixes and tweaks * chore: use reviewdog actionlint * chore: use wow-rp-addons/actions-editorconfig-check * chore: combine agent instructions, add comments, fixes * chore: linting, fixes, go revive * chore(deps): update pre-commit hooks * chore: bump go to 1.21, pin workflows * fix: install tools in lint.yml * fix: sudo timeout * fix: service command injection * fix: memory exhaustion with large logs * fix: enhanced path traversal and file security vulns * fix: race conditions * fix: context support * chore: simplify fail2ban/ code * feat: major refactoring with GoReleaser integration and code consolidation - Add GoReleaser configuration for automated multi-platform releases - Support for Linux, macOS, Windows, and BSD builds - Docker images, Homebrew tap, and Linux packages (.deb, .rpm, .apk) - GitHub Actions workflow for release automation - Consolidate duplicate code and improve architecture - Extract common command helpers to cmd/helpers.go (~230 lines) - Remove duplicate MockClient implementation from tests (~250 lines) - Create context wrapper helpers in fail2ban/context_helpers.go - Standardize error messages in fail2ban/errors.go - Enhance validation and security - Add proper IP address validation with fail2ban.ValidateIP - Fix path traversal and command injection vulnerabilities - Improve thread-safety in MockClient with consistent ordering - Optimize documentation - Reduce CLAUDE.md from 190 to 81 lines (57% reduction) - Reduce TODO.md from 633 to 93 lines (85% reduction) - Move README.md to root directory with installation instructions - Improve test reliability - Fix race conditions and test flakiness - Add sorting to ensure deterministic test output - Enhance MockClient with configurable behavior * feat: comprehensive code quality improvements and documentation reorganization This commit represents a major overhaul of code quality, documentation structure, and development tooling: **Documentation & Structure:** - Move CODE_OF_CONDUCT.md from .github to root directory - Reorganize documentation with dedicated docs/ directory - Create comprehensive architecture, security, and testing documentation - Update all references and cross-links for new documentation structure **Code Quality & Linting:** - Add 120-character line length limit across all files via EditorConfig - Enable comprehensive linting with golines, lll, usetesting, gosec, and revive - Fix all 86 revive linter issues (unused parameters, missing export comments) - Resolve security issues (file permissions 0644 → 0600, gosec warnings) - Replace deprecated os.Setenv with t.Setenv in all tests - Configure golangci-lint with auto-fix capabilities and formatter integration **Development Tooling:** - Enhance pre-commit configuration with additional hooks and formatters - Update GoReleaser configuration with improved YAML formatting - Improve GitHub workflows and issue templates for CLI-specific context - Add comprehensive Makefile with proper dependency checking **Testing & Security:** - Standardize mock patterns and context wrapper implementations - Enhance error handling with centralized error constants - Improve concurrent access testing for thread safety * perf: implement major performance optimizations with comprehensive test coverage This commit introduces three significant performance improvements along with complete linting compliance and robust test coverage: **Performance Optimizations:** 1. **Time Parsing Cache (8.6x improvement)** - Add TimeParsingCache with sync.Map for caching parsed times - Implement object pooling for string builders to reduce allocations - Create optimized BanRecordParser with pooled string slices 2. **Gzip Detection Consolidation (55x improvement)** - Consolidate ~100 lines of duplicate gzip detection logic - Fast-path extension checking before magic byte detection - Unified GzipDetector with comprehensive file handling utilities 3. **Parallel Processing (2.5-5.0x improvement)** - Generic WorkerPool implementation for concurrent operations - Smart fallback to sequential processing for single operations - Context-aware cancellation support for long-running tasks - Applied to ban/unban operations across multiple jails **New Files Added:** - fail2ban/time_parser.go: Cached time parsing with global instances - fail2ban/ban_record_parser.go: Optimized ban record parsing - fail2ban/gzip_detection.go: Unified gzip handling utilities - fail2ban/parallel_processing.go: Generic parallel processing framework - cmd/parallel_operations.go: Command-level parallel operation support **Code Quality & Linting:** - Resolve all golangci-lint issues (0 remaining) - Add proper #nosec annotations for legitimate file operations - Implement sentinel errors replacing nil/nil anti-pattern - Fix context parameter handling and error checking **Comprehensive Test Coverage:** - 500+ lines of new tests with benchmarks validating all improvements - Concurrent access testing for thread safety - Edge case handling and error condition testing - Performance benchmarks demonstrating measured improvements **Modified Files:** - fail2ban/fail2ban.go: Integration with new optimized parsers - fail2ban/logs.go: Use consolidated gzip detection (-91 lines) - cmd/ban.go & cmd/unban.go: Add conditional parallel processing * test: comprehensive test infrastructure overhaul with real test data Major improvements to test code quality and organization: • Added comprehensive test data infrastructure with 6 anonymized log files • Extracted common test helpers reducing ~200 lines to ~50 reusable functions • Enhanced ban record parser tests with real production log patterns • Improved gzip detection tests with actual compressed test data • Added integration tests for full log processing and concurrent operations • Updated .gitignore to allow testdata log files while excluding others • Updated TODO.md to reflect completed test infrastructure improvements * fix: comprehensive security hardening and critical bug fixes Security Enhancements: - Add command injection protection with allowlist validation for all external commands - Add security documentation to gzip functions warning about path traversal risks - Complete TODO.md security audit - all critical vulnerabilities addressed Bug Fixes: - Fix negative index access vulnerability in parallel operations (prevent panic) - Fix parsing inconsistency between BannedIn and BannedInWithContext functions - Fix nil error handling in concurrent log reading tests - Fix benchmark error simulation to measure actual performance vs error paths Implementation Details: - Add ValidateCommand() with allowlist for fail2ban-client, fail2ban-regex, service, systemctl, sudo - Integrate command validation into all OSRunner methods before execution - Replace manual string parsing with ParseBracketedList() for consistency - Add bounds checking (index >= 0) to prevent negative array access - Replace nil error with descriptive error message in concurrent error channels - Update banFunc in benchmark to return success instead of permanent errors Test Coverage: - Add comprehensive security validation tests with injection attempt patterns - Add parallel operations safety tests with index validation - Add parsing consistency tests between context/non-context functions - Add error handling demonstration tests for concurrent operations - Add gzip function security requirement documentation tests * perf: implement ultra-optimized log and ban record parsing with significant performance gains Major performance improvements to core fail2ban processing with comprehensive benchmarking: Performance Achievements: • Ban record parsing: 15% faster, 39% less memory, 45% fewer allocations • Log processing: 27% faster, 64% less memory, 32% fewer allocations • Cache performance: 624x faster cache hits with zero allocations • String pooling: 4.7x improvement with zero memory allocations Core Optimizations: • Object pooling (sync.Pool) for string slices, scanner buffers, and line buffers • Comprehensive caching (sync.Map) for gzip detection, file info, and path patterns • Fast path optimizations with extension-based gzip detection • Byte-level operations to reduce string allocations in filtering • Ultra-optimized parsers with smart field parsing and efficient time handling New Files: • fail2ban/ban_record_parser_optimized.go - High-performance ban record parser • fail2ban/log_performance_optimized.go - Ultra-optimized log processor with caching • fail2ban/ban_record_parser_benchmark_test.go - Ban record parsing benchmarks • fail2ban/log_performance_benchmark_test.go - Log performance benchmarks • fail2ban/ban_record_parser_compatibility_test.go - Compatibility verification tests Updated: • fail2ban/fail2ban.go - Integration with ultra-optimized parsers • TODO.md - Marked performance optimization tasks as completed * fix(ci): install dev dependencies for pre-commit * refactor: streamline pre-commit config and extract test helpers - Replace local hooks with upstream pre-commit repositories for better maintainability - Add new hooks: shellcheck, shfmt, checkov for enhanced code quality - Extract common test helpers into dedicated test_helpers.go to reduce duplication - Add warning logs for unreadable log files in fail2ban and logs packages - Remove hard-coded GID checks in sudo.go for better cross-platform portability - Update golangci-lint installation method in Makefile * fix(security): path traversal, log file validation * feat: complete pre-release modernization with comprehensive testing - Remove all deprecated legacy functions and dead code paths - Add security hardening with sanitized error messages - Implement comprehensive performance benchmarks and security audit tests - Mark all pre-release modernization tasks as completed (10/10) - Update project documentation to reflect full completion status * fix(ci): linting, and update gosec install source * feat: implement comprehensive test framework with 60-70% code reduction Major test infrastructure modernization: - Create fluent CommandTestBuilder framework for streamlined test creation - Add MockClientBuilder pattern for advanced mock configuration - Standardize table test field naming (expectedOut→wantOutput, expectError→wantError) - Consolidate test code: 3,796 insertions, 3,104 deletions (net +692 lines with enhanced functionality) Framework achievements: - 168+ tests passing with zero regressions - 5 cmd test files fully migrated to new framework - 63 field name standardizations applied - Advanced mock patterns with fluent interface File organization improvements: - Rename all test files with consistent prefixes (cmd_*, fail2ban_*, main_*) - Split monolithic test files into focused, maintainable modules - Eliminate cmd_test.go (622 lines) and main_test.go (825 lines) - Create specialized test files for better organization Documentation enhancements: - Update docs/testing.md with complete framework documentation - Optimize TODO.md from 231→72 lines (69% token reduction) - Add comprehensive migration guides and best practices Test framework components: - command_test_framework.go: Core fluent interface implementation - MockClientBuilder: Advanced mock configuration with builder pattern - table_test_standards.go: Standardized field naming conventions - Enhanced test helpers with error checking consolidation * chore: fixes, .go-version, linting * fix(ci) editorconfig in .pre-commit-config.yaml * fix: too broad gitignore * chore: update fail2ban/fail2ban_path_security_test.go Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Signed-off-by: Ismo Vuorinen <ismo@ivuorinen.net> * chore: code review fixes * chore: code review fixes * fix: more code review fixes * fix: more code review fixes * feat: cleanup, fixes, testing * chore: minor config file updates - Add quotes to F2B_TIMEOUT value in .env.example for clarity - Remove testdata log exception from .gitignore (simplified) * feat: implement comprehensive monitoring with structured logging and metrics - Add structured logging with context propagation throughout codebase - Implement ContextualLogger with request tracking and operation timing - Add context values for operation, IP, jail, command, and request ID - Integrate with existing logrus logging infrastructure - Add request/response timing metrics collection - Create comprehensive Metrics system with atomic counters - Track command executions, ban/unban operations, and client operations - Implement latency distribution buckets for performance analysis - Add validation cache hit/miss tracking - Enhance ban/unban commands with structured logging - Add LogOperation wrapper for automatic timing and context - Log individual jail operations with success/failure status - Integrate metrics recording with ban/unban operations - Add new 'metrics' command to expose collected metrics - Support both plain text and JSON output formats - Display system metrics (uptime, memory, goroutines) - Show operation counts, failures, and average latencies - Include latency distribution histograms - Update test infrastructure - Add tests for metrics command - Fix test helper to support persistent flags - Ensure all tests pass with new logging This completes the high-priority performance monitoring and structured logging requirements from TODO.md, providing comprehensive operational visibility into the f2b application. * docs: update TODO.md to reflect completed monitoring work - Mark structured logging and timing metrics as completed - Update test coverage stats (cmd/ improved from 66.4% to 76.8%) - Add completed infrastructure section for today's work - Update current status date and add monitoring to health indicators * feat: complete TODO.md technical debt cleanup Complete all remaining TODO.md tasks with comprehensive implementation: ## 🎯 Validation Caching Implementation - Thread-safe validation cache with sync.RWMutex protection - MetricsRecorder interface to avoid circular dependencies - Cached validation for IP, jail, filter, and command validation - Integration with existing metrics system for cache hit/miss tracking - 100% test coverage for caching functionality ## 🔧 Constants Extraction - Fail2Ban status codes: Fail2BanStatusSuccess, Fail2BanStatusAlreadyProcessed - Command constants: Fail2BanClientCommand, Fail2BanRegexCommand, Fail2BanServerCommand - File permissions: DefaultFilePermissions (0600), DefaultDirectoryPermissions (0750) - Timeout limits: MaxCommandTimeout, MaxFileTimeout, MaxParallelTimeout - Updated all references throughout codebase to use named constants ## 📊 Test Coverage Improvement - Increased fail2ban package coverage from 62.0% to 70.3% (target: 70%+) - Added 6 new comprehensive test files with 200+ additional test cases - Coverage improvements across all major components: - Context helpers, validation cache, mock clients, OS runner methods - Error constructors, timing operations, cache statistics - Thread safety and concurrency testing ## 🛠️ Code Quality & Fixes - Fixed all linting issues (golangci-lint, revive, errcheck) - Resolved unused parameter warnings and error handling - Fixed timing-dependent test failures in worker pool cancellation - Enhanced thread safety in validation caching ## 📈 Final Metrics - Overall test coverage: 72.4% (up from ~65%) - fail2ban package: 70.3% (exceeds 70% target) - cmd package: 76.9% - Zero TODO/FIXME/HACK comments in production code - 100% linting compliance * fix: resolve test framework issues and update documentation - Remove unnecessary defer/recover block in comprehensive_framework_test.go - Fix compilation error in command_test_framework.go variable redeclaration - Update TODO.md to reflect all 12 completed code quality fixes - Clean up dead code and improve test maintainability - Fix linting issues: error handling, code complexity, security warnings - Break down complex test function to reduce cyclomatic complexity * fix: replace dangerous test commands with safe placeholders Replaces actual dangerous commands in test cases with safe placeholder patterns to prevent accidental execution while maintaining comprehensive security testing. - Replace 'rm -rf /', 'cat /etc/passwd' with 'DANGEROUS_RM_COMMAND', 'DANGEROUS_SYSTEM_CALL' - Update GetDangerousCommandPatterns() to recognize both old and new patterns - Enhance filter validation with command injection protection (semicolons, pipes, backticks, dollar signs) - Add package documentation comments for all packages (main, cmd, fail2ban) - Fix GoReleaser static linking configuration for cross-platform builds - Remove Docker platform restriction to enable multi-arch support - Apply code formatting and linting fixes All security validation tests continue to pass with the safe placeholders. * fix: resolve TestMixedConcurrentOperations race condition and command key mismatches The concurrency test was failing due to several issues: 1. **Command Key Mismatch**: Test setup used "sudo test arg" key but MockRunner looked for "test arg" because "test" command doesn't require sudo 2. **Invalid Commands**: Using "test" and "echo" commands that aren't in the fail2ban command allowlist, causing validation failures 3. **Race Conditions**: Multiple goroutines setting different MockRunners simultaneously, overwriting responses **Solution:** - Replace invalid test commands ("test", "echo") with valid fail2ban commands ("fail2ban-client status", "fail2ban-client -V") - Pre-configure shared MockRunner with all required response keys for both sudo and non-sudo execution paths - Improve test structure to reduce race conditions between setup and execution All tests now pass reliably, resolving the CI failure. * fix: address code quality issues and improve test coverage - Replace unsafe type assertion with comma-ok idiom in logging - Fix TestTestFilter to use created filter instead of nonexistent - Add warning logs for invalid log level configurations - Update TestVersionCommand to use consistent test framework pattern - Remove unused LoggerContextKey constant - Add version command support to test framework - Fix trailing whitespace in test files * feat: add timeout handling and multi-architecture Docker support * test: enhance path traversal security test coverage * chore: comprehensive documentation update and linting fixes Updated all documentation to reflect current capabilities including context-aware operations, multi-architecture Docker support, advanced security features, and performance monitoring. Removed unused functions and fixed all linting issues. * fix(lint): .goreleaser.yaml * feat: add markdown link checker and fix all linting issues - Add markdown-link-check to pre-commit hooks with comprehensive configuration - Fix GitHub workflow structure (sync-labels.yml) with proper job setup - Add JSON schemas to all configuration files for better IDE support - Update tool installation in Makefile for markdown-link-check dependency - Fix all revive linting issues (Boolean literals, defer in loop, if-else simplification, method naming) - Resolve broken relative link in CONTRIBUTING.md - Configure rate limiting and ignore patterns for GitHub URLs - Enhance CLAUDE.md with link checking documentation * fix(ci): sync-labels permissions * docs: comprehensive documentation update reflecting current project status - Updated TODO.md to show production-ready status with 21 commands - Enhanced README.md with enterprise-grade features and capabilities - Added performance monitoring and timeout configuration to FAQ - Updated CLAUDE.md with accurate project architecture overview - Fixed all line length issues to meet EditorConfig requirements - Added .mega-linter.yml configuration for enhanced linting * fix: address CodeRabbitAI review feedback - Split .goreleaser.yaml builds for static/dynamic linking by architecture - Update docs to accurately reflect 7 path traversal patterns (not 17) - Fix containsPathTraversal to allow valid absolute paths - Replace runnerCombinedRunWithSudoContext with RunnerCombinedOutputWithSudoContext - Fix ldflags to use uppercase Version variable name - Remove duplicate test coverage metrics in TODO.md - Fix .markdown-link-check.json schema violations - Add v8r JSON validator to pre-commit hooks * chore(ci): update workflows, switch v8r to check-jsonschema * fix: restrict static linking to amd64 only in .goreleaser.yaml - Move arm64 from static to dynamic build configuration - Static linking now only applies to linux/amd64 - Prevents build failures due to missing static libc on ARM64 - All architectures remain supported with appropriate linking * fix(ci): caching * fix(ci): python caching with pip, node with npm * fix(ci): no caching for node then * fix(ci): no requirements.txt, no cache * refactor: address code review feedback - Pin Alpine base image to v3.20 for reproducible builds - Remove redundant --platform flags in GoReleaser Docker configs - Fix unused parameters in concurrency test goroutines - Simplify string search helper using strings.Contains() - Remove redundant error checking logic in security tests --------- Signed-off-by: Ismo Vuorinen <ismo@ivuorinen.net> Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
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# f2b Internal API Documentation
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This document provides comprehensive documentation for the internal APIs
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and interfaces used in the f2b project. This is intended for developers
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who want to contribute to the project or integrate with its components.
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## Table of Contents
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- [Core Interfaces](#core-interfaces)
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- [Client Package](#client-package)
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- [Command Package](#command-package)
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- [Error Handling](#error-handling)
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- [Configuration](#configuration)
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- [Logging and Metrics](#logging-and-metrics)
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- [Testing Framework](#testing-framework)
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- [Examples](#examples)
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## Core Interfaces
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### fail2ban.Client Interface
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The core interface for interacting with fail2ban operations.
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```go
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type Client interface {
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// Basic operations
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BanIP(ip, jail string) (int, error)
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UnbanIP(ip, jail string) (int, error)
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BanIPWithContext(ctx context.Context, ip, jail string) (int, error)
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UnbanIPWithContext(ctx context.Context, ip, jail string) (int, error)
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// Information retrieval
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ListJails() ([]string, error)
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ListJailsWithContext(ctx context.Context) ([]string, error)
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StatusAll() (string, error)
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StatusJail(jail string) (string, error)
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GetBanRecords(jails []string) ([]BanRecord, error)
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BannedIn(ip string) ([]string, error)
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// Filter operations
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ListFilters() ([]string, error)
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TestFilter(filter, logfile string, verbose bool) ([]string, error)
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}
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```
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### Implementation Examples
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#### Using the Client Interface
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```go
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package main
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import (
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"context"
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"fmt"
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"time"
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"github.com/ivuorinen/f2b/fail2ban"
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)
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func banIPExample() error {
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// Create a client
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client, err := fail2ban.NewClient()
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if err != nil {
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return fmt.Errorf("failed to create client: %w", err)
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}
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// Ban an IP with timeout context
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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code, err := client.BanIPWithContext(ctx, "192.168.1.100", "sshd")
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if err != nil {
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return fmt.Errorf("ban operation failed: %w", err)
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}
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fmt.Printf("Ban operation completed with code: %d\n", code)
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return nil
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}
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```
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## Client Package
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### Real Client
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The `RealClient` struct implements the `Client` interface for actual fail2ban operations.
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```go
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type RealClient struct {
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path string // Path to fail2ban-client binary
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timeout time.Duration // Default timeout for operations
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sudoChecker SudoChecker // Interface for sudo privilege checking
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runner Runner // Interface for command execution
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}
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```
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#### Configuration
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```go
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// Create a new client with custom timeout
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client, err := fail2ban.NewClientWithTimeout(45 * time.Second)
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if err != nil {
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return err
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}
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// Create a client with custom sudo checker
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customSudoChecker := &MyCustomSudoChecker{}
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client, err := fail2ban.NewClientWithSudo(customSudoChecker)
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```
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### Mock Client
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For testing purposes, use the `MockClient`:
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```go
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func TestMyFunction(t *testing.T) {
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mock := fail2ban.NewMockClient()
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// Configure mock responses
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mock.Jails = map[string]struct{}{
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"sshd": {},
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"apache": {},
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}
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mock.Banned = map[string]map[string]time.Time{
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"sshd": {"192.168.1.100": time.Now()},
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}
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// Use mock in your test
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result, err := myFunction(mock)
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// ... assertions
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}
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```
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## Command Package
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### Config Structure
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The central configuration structure for the CLI:
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```go
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type Config struct {
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LogDir string // Path to Fail2Ban log directory
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FilterDir string // Path to Fail2Ban filter directory
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Format string // Output format: "plain" or "json"
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CommandTimeout time.Duration // Timeout for individual fail2ban commands
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FileTimeout time.Duration // Timeout for file operations
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ParallelTimeout time.Duration // Timeout for parallel operations
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}
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```
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#### Configuration Validation
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```go
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func validateConfig() error {
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config := cmd.NewConfigFromEnv()
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// Validate the configuration
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if err := config.ValidateConfig(); err != nil {
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return fmt.Errorf("invalid configuration: %w", err)
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}
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return nil
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}
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```
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### Command Helpers
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The `cmd` package provides several helper functions for command creation and validation:
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```go
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// Command creation
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func NewCommand(
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use,
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short string,
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aliases []string,
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runE func(*cobra.Command, []string) error
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) *cobra.Command
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// Validation helpers
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func ValidateIPArgument(args []string) (string, error)
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func ValidateServiceAction(action string) error
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// Jail operations
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func GetJailsFromArgsWithContext(
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ctx context.Context,
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client fail2ban.Client,
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args []string,
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startIndex int
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) ([]string, error)
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// Error handling
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func HandleClientError(err error) error
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func PrintErrorAndReturn(err error) error
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```
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## Error Handling
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### Contextual Errors
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The f2b project uses enhanced error handling with context and remediation hints:
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```go
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type ContextualError struct {
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Message string
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Category ErrorCategory
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Remediation string
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Cause error
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}
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// Create contextual errors
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validationErr := fail2ban.NewValidationError(
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"invalid IP address: 192.168.1.999",
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"Provide a valid IPv4 or IPv6 address",
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)
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systemErr := fail2ban.NewSystemError(
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"fail2ban service not running",
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"Start the service with: sudo systemctl start fail2ban",
|
||||
originalError,
|
||||
)
|
||||
```
|
||||
|
||||
### Error Categories
|
||||
|
||||
```go
|
||||
const (
|
||||
ErrorCategoryValidation ErrorCategory = "validation"
|
||||
ErrorCategoryNetwork ErrorCategory = "network"
|
||||
ErrorCategoryPermission ErrorCategory = "permission"
|
||||
ErrorCategorySystem ErrorCategory = "system"
|
||||
ErrorCategoryConfig ErrorCategory = "config"
|
||||
)
|
||||
```
|
||||
|
||||
## Configuration
|
||||
|
||||
### Environment Variables
|
||||
|
||||
The configuration system supports the following environment variables:
|
||||
|
||||
| Variable | Description | Default |
|
||||
|----------|-------------|---------|
|
||||
| `F2B_LOG_DIR` | Log directory path | `/var/log` |
|
||||
| `F2B_FILTER_DIR` | Filter directory path | `/etc/fail2ban/filter.d` |
|
||||
| `F2B_LOG_LEVEL` | Log level | `info` |
|
||||
| `F2B_COMMAND_TIMEOUT` | Command timeout | `30s` |
|
||||
| `F2B_FILE_TIMEOUT` | File operation timeout | `10s` |
|
||||
| `F2B_PARALLEL_TIMEOUT` | Parallel operation timeout | `60s` |
|
||||
|
||||
### Path Security
|
||||
|
||||
All configuration paths undergo comprehensive validation:
|
||||
|
||||
```go
|
||||
func validateConfigPath(path, pathType string) (string, error)
|
||||
```
|
||||
|
||||
This function:
|
||||
|
||||
- Checks for path traversal attempts
|
||||
- Validates against null byte injection
|
||||
- Ensures paths are within reasonable system locations
|
||||
- Resolves to absolute paths
|
||||
- Enforces length limits
|
||||
|
||||
## Logging and Metrics
|
||||
|
||||
### Contextual Logging
|
||||
|
||||
The logging system supports structured logging with context propagation:
|
||||
|
||||
```go
|
||||
// Create a contextual logger
|
||||
logger := cmd.NewContextualLogger()
|
||||
|
||||
// Add context to logging
|
||||
ctx := cmd.WithOperation(context.Background(), "ban_ip")
|
||||
ctx = cmd.WithIP(ctx, "192.168.1.100")
|
||||
ctx = cmd.WithJail(ctx, "sshd")
|
||||
|
||||
// Log with context
|
||||
logger.WithContext(ctx).Info("Starting ban operation")
|
||||
|
||||
// Log operations with timing
|
||||
err := logger.LogOperation(ctx, "ban_operation", func() error {
|
||||
return client.BanIP("192.168.1.100", "sshd")
|
||||
})
|
||||
```
|
||||
|
||||
### Performance Metrics
|
||||
|
||||
The metrics system provides comprehensive performance monitoring:
|
||||
|
||||
```go
|
||||
// Get global metrics
|
||||
metrics := cmd.GetGlobalMetrics()
|
||||
|
||||
// Record operations
|
||||
metrics.RecordCommandExecution("ban", duration, success)
|
||||
metrics.RecordBanOperation("ban", duration, success)
|
||||
metrics.RecordValidationCacheHit()
|
||||
|
||||
// Get metrics snapshot
|
||||
snapshot := metrics.GetSnapshot()
|
||||
fmt.Printf("Command executions: %d\n", snapshot.CommandExecutions)
|
||||
fmt.Printf("Average latency: %.2fms\n", snapshot.CommandLatencyBuckets["ban"].GetAverageLatency())
|
||||
```
|
||||
|
||||
### Timed Operations
|
||||
|
||||
Use timed operations for automatic instrumentation:
|
||||
|
||||
```go
|
||||
func performBanOperation(ctx context.Context, ip, jail string) error {
|
||||
metrics := cmd.GetGlobalMetrics()
|
||||
timer := cmd.NewTimedOperation(ctx, metrics, "ban", "ban_ip")
|
||||
|
||||
// Perform the operation
|
||||
err := client.BanIP(ip, jail)
|
||||
|
||||
// Record timing and success/failure
|
||||
timer.Finish(err == nil)
|
||||
|
||||
return err
|
||||
}
|
||||
```
|
||||
|
||||
## Testing Framework
|
||||
|
||||
### Modern Test Framework
|
||||
|
||||
The f2b project includes a fluent testing framework for command testing:
|
||||
|
||||
```go
|
||||
func TestBanCommand(t *testing.T) {
|
||||
cmd.NewCommandTest(t, "ban").
|
||||
WithArgs("192.168.1.100", "sshd").
|
||||
WithSetup(func(mock *fail2ban.MockClient) {
|
||||
setMockJails(mock, []string{"sshd"})
|
||||
}).
|
||||
ExpectSuccess().
|
||||
ExpectOutput("Banned 192.168.1.100 in sshd").
|
||||
Run()
|
||||
}
|
||||
```
|
||||
|
||||
### Mock Client Builder
|
||||
|
||||
For complex mock scenarios:
|
||||
|
||||
```go
|
||||
func TestComplexScenario(t *testing.T) {
|
||||
mockBuilder := cmd.NewMockClientBuilder().
|
||||
WithJails("sshd", "apache").
|
||||
WithBannedIP("192.168.1.100", "sshd").
|
||||
WithBanRecord("sshd", "192.168.1.100", "01:30:00").
|
||||
WithStatusResponse("sshd", "Status: active")
|
||||
|
||||
cmd.NewCommandTest(t, "status").
|
||||
WithArgs("sshd").
|
||||
WithMockBuilder(mockBuilder).
|
||||
ExpectSuccess().
|
||||
Run()
|
||||
}
|
||||
```
|
||||
|
||||
### Environment Setup
|
||||
|
||||
Use standardized environment setup:
|
||||
|
||||
```go
|
||||
func TestWithMockEnvironment(t *testing.T) {
|
||||
_, cleanup := fail2ban.SetupMockEnvironmentWithSudo(t, true)
|
||||
defer cleanup()
|
||||
|
||||
// Test implementation with mocked environment
|
||||
}
|
||||
```
|
||||
|
||||
## Examples
|
||||
|
||||
### Complete Command Implementation
|
||||
|
||||
Here's how to implement a new command following f2b patterns:
|
||||
|
||||
```go
|
||||
package cmd
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
|
||||
"github.com/spf13/cobra"
|
||||
"github.com/ivuorinen/f2b/fail2ban"
|
||||
)
|
||||
|
||||
// MyCmd implements a new command with full context and error handling
|
||||
func MyCmd(client fail2ban.Client, config *Config) *cobra.Command {
|
||||
return NewCommand("mycmd <arg>", "My command description", []string{"mc"},
|
||||
func(cmd *cobra.Command, args []string) error {
|
||||
// Create timeout context
|
||||
ctx, cancel := context.WithTimeout(context.Background(), config.CommandTimeout)
|
||||
defer cancel()
|
||||
|
||||
// Validate arguments
|
||||
if len(args) < 1 {
|
||||
return PrintErrorAndReturn(fail2ban.ErrActionRequiredError)
|
||||
}
|
||||
|
||||
// Add context for logging
|
||||
ctx = WithOperation(ctx, "my_operation")
|
||||
ctx = WithCommand(ctx, "mycmd")
|
||||
|
||||
// Log operation with timing
|
||||
logger := GetContextualLogger()
|
||||
return logger.LogOperation(ctx, "my_command", func() error {
|
||||
// Perform operation with client
|
||||
result, err := client.SomeOperation(args[0])
|
||||
if err != nil {
|
||||
return HandleClientError(err)
|
||||
}
|
||||
|
||||
// Output results
|
||||
OutputResults(cmd, result, config)
|
||||
return nil
|
||||
})
|
||||
})
|
||||
}
|
||||
```
|
||||
|
||||
### Custom Client Implementation
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"time"
|
||||
|
||||
"github.com/ivuorinen/f2b/fail2ban"
|
||||
)
|
||||
|
||||
// CustomClient implements the Client interface with custom logic
|
||||
type CustomClient struct {
|
||||
baseClient fail2ban.Client
|
||||
customLogic string
|
||||
}
|
||||
|
||||
func (c *CustomClient) BanIP(ip, jail string) (int, error) {
|
||||
// Custom pre-processing
|
||||
if err := c.preprocessBan(ip, jail); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
// Delegate to base client
|
||||
return c.baseClient.BanIP(ip, jail)
|
||||
}
|
||||
|
||||
func (c *CustomClient) BanIPWithContext(ctx context.Context, ip, jail string) (int, error) {
|
||||
// Context-aware implementation
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
return 0, ctx.Err()
|
||||
default:
|
||||
return c.BanIP(ip, jail)
|
||||
}
|
||||
}
|
||||
|
||||
// Implement other Client interface methods...
|
||||
|
||||
func (c *CustomClient) preprocessBan(ip, jail string) error {
|
||||
// Custom validation or processing logic
|
||||
return nil
|
||||
}
|
||||
```
|
||||
|
||||
### Integration with External Systems
|
||||
|
||||
```go
|
||||
package integration
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"net/http"
|
||||
|
||||
"github.com/ivuorinen/f2b/fail2ban"
|
||||
"github.com/ivuorinen/f2b/cmd"
|
||||
)
|
||||
|
||||
// HTTPHandler provides HTTP API integration
|
||||
type HTTPHandler struct {
|
||||
client fail2ban.Client
|
||||
logger *cmd.ContextualLogger
|
||||
}
|
||||
|
||||
func (h *HTTPHandler) BanHandler(w http.ResponseWriter, r *http.Request) {
|
||||
ctx := r.Context()
|
||||
|
||||
// Extract parameters
|
||||
ip := r.URL.Query().Get("ip")
|
||||
jail := r.URL.Query().Get("jail")
|
||||
|
||||
// Validate
|
||||
if err := fail2ban.ValidateIP(ip); err != nil {
|
||||
h.writeError(w, http.StatusBadRequest, err)
|
||||
return
|
||||
}
|
||||
|
||||
// Perform operation with logging
|
||||
err := h.logger.LogOperation(ctx, "http_ban", func() error {
|
||||
_, err := h.client.BanIPWithContext(ctx, ip, jail)
|
||||
return err
|
||||
})
|
||||
|
||||
if err != nil {
|
||||
h.writeError(w, http.StatusInternalServerError, err)
|
||||
return
|
||||
}
|
||||
|
||||
// Success response
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
json.NewEncoder(w).Encode(map[string]string{
|
||||
"status": "success",
|
||||
"ip": ip,
|
||||
"jail": jail,
|
||||
})
|
||||
}
|
||||
|
||||
func (h *HTTPHandler) writeError(w http.ResponseWriter, code int, err error) {
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
w.WriteHeader(code)
|
||||
|
||||
response := map[string]string{"error": err.Error()}
|
||||
|
||||
// Add remediation hint if available
|
||||
if contextErr, ok := err.(*fail2ban.ContextualError); ok {
|
||||
response["hint"] = contextErr.GetRemediation()
|
||||
response["category"] = string(contextErr.GetCategory())
|
||||
}
|
||||
|
||||
json.NewEncoder(w).Encode(response)
|
||||
}
|
||||
```
|
||||
|
||||
## Best Practices
|
||||
|
||||
### Error Handling
|
||||
|
||||
1. Always use contextual errors for user-facing messages
|
||||
2. Provide remediation hints where possible
|
||||
3. Log errors with appropriate context
|
||||
4. Use error categories for systematic handling
|
||||
|
||||
### Context Usage
|
||||
|
||||
1. Always use context for operations that can timeout
|
||||
2. Propagate context through the call chain
|
||||
3. Add relevant context values for logging
|
||||
4. Use context cancellation for cleanup
|
||||
|
||||
### Testing
|
||||
|
||||
1. Use the fluent testing framework for command tests
|
||||
2. Always use mock environments for integration tests
|
||||
3. Test both success and failure scenarios
|
||||
4. Include timeout testing for long-running operations
|
||||
|
||||
### Performance
|
||||
|
||||
1. Use the metrics system to monitor performance
|
||||
2. Implement proper caching where appropriate
|
||||
3. Use object pooling for frequently allocated objects
|
||||
4. Profile and optimize hot paths
|
||||
|
||||
This documentation provides a comprehensive overview of the f2b internal APIs and patterns.
|
||||
For specific implementation details, refer to the source code and inline documentation.
|
||||
Reference in New Issue
Block a user