mirror of
https://github.com/ivuorinen/f2b.git
synced 2026-03-08 01:58:21 +00:00
Ismo Vuorinen
98b53d84b5
* fix: repair Renovate config and convert Makefile to go run (#117) - Remove non-existent `github>renovatebot/presets:golang` preset that broke Renovate PR creation - Replace deprecated `fileMatch` with `managerFilePatterns` in customManagers - Rewrite regex to match new Makefile pattern (renovate comment above version variable assignment) - Fix `matchFileNames` glob pattern (`*.mk` -> `**/*.mk`) - Convert all tool invocations from `go install` + global binary to `go run tool@version` for reproducible builds - Convert npm global tools to `npx --yes` invocations - Remove `dev-deps` and `check-deps` targets (tools auto-download) - Add mdformat pre-commit hook with GFM support and config - Add `fmt-md` Makefile target for manual markdown formatting - Update local golangci-lint pre-commit hook to use `go run` - Apply golangci-lint v2.10.1 auto-fixes (fmt.Fprintf optimization) - Add nolint:gosec annotations for legitimate exec.Command usage - Exclude .serena/ from mdformat and megalinter - Add markdown indent_size=unset in .editorconfig for CommonMark compat * chore(deps): update GitHub Actions to latest versions - anthropics/claude-code-action: v1.0.34 -> v1.0.64 - actions/setup-go: v6.2.0 -> v6.3.0 - actions/upload-artifact: v6.0.0 -> v7.0.0 - goreleaser/goreleaser-action: v6.4.0 -> v7.0.0 - docker/login-action: v3.6.0 -> v3.7.0 - ivuorinen/actions: v2026.01.21 -> v2026.02.24 * fix: address code review feedback - Fix issue template YAML frontmatter (replace underscore separators with proper --- delimiters); exclude templates from mdformat - Replace string(rune(n)) with strconv.Itoa(n) in test files to produce deterministic numeric directory names instead of Unicode characters - Remove stale `make dev-deps` reference in README, replace with `make dev-setup` - Extract ban/unban format strings into shared.MetricsFmtBanOperations and shared.MetricsFmtUnbanOperations constants - Replace hardcoded coverage percentages in README with evergreen phrasing * fix: address round 2 code review feedback for PR #120 - Fix corrupted path traversal example in docs/security.md - Fix Renovate .mk regex to match nested paths (.*\.mk$) - Update checkmake pre-commit hook to v0.3.2 to match Makefile - Add sync.WaitGroup to unsynchronized goroutines in security tests - Fix fmt-md target to use pre-commit run mdformat - Pin markdownlint-cli2 to v0.21.0 in lint-md target - Standardize //nolint:gosec to // #nosec annotations for gosec CLI * fix(ci): install PyYAML dependency for PR lint workflow The pr-lint workflow uses ivuorinen/actions/pr-lint which internally calls validate-inputs running a Python script that imports yaml. Python was set up but PyYAML was never installed, causing ModuleNotFoundError at runtime. * fix: address round 3 code review feedback for PR #120 - Wrap Windows-style path traversal example in backtick code span so backslashes render literally in docs/security.md - Add Renovate-managed MARKDOWNLINT_CLI2_VERSION variable in Makefile to match the pattern used by all other tool versions
524 lines
18 KiB
Markdown
524 lines
18 KiB
Markdown
# f2b - Modern Fail2Ban CLI Wrapper
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A modern, secure, and extensible Go CLI tool for managing [Fail2Ban](https://www.fail2ban.org/) jails and bans.
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Built with Go, featuring automatic sudo privilege management, shell completion, and comprehensive security.
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[](https://choosealicense.com/licenses/mit/)
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[](https://golang.org/)
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[](https://github.com/ivuorinen/f2b/actions)
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______________________________________________________________________
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## 🚀 Quick Start
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### Prerequisites
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- **Go 1.25+** (for building from source)
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- **Fail2Ban** installed and running
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- **Appropriate privileges** (root, sudo group, or sudo access) for ban operations
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### Installation
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#### Download Pre-built Binary
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Download the latest release for your platform from the [releases page](https://github.com/ivuorinen/f2b/releases).
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```bash
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# Linux (amd64)
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wget https://github.com/ivuorinen/f2b/releases/latest/download/f2b_Linux_x86_64.tar.gz
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tar -xzf f2b_Linux_x86_64.tar.gz
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sudo mv f2b /usr/local/bin/
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# macOS (Apple Silicon)
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wget https://github.com/ivuorinen/f2b/releases/latest/download/f2b_Darwin_arm64.tar.gz
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tar -xzf f2b_Darwin_arm64.tar.gz
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sudo mv f2b /usr/local/bin/
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```
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#### Using Homebrew (macOS/Linux)
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```bash
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brew tap ivuorinen/tap
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brew install f2b
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```
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#### Using Go
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```bash
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# Install latest version
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go install github.com/ivuorinen/f2b@latest
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# Install specific version
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go install github.com/ivuorinen/f2b@v1.2.3
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```
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#### Using Docker (Multi-Architecture)
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```bash
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# Pull latest multi-architecture image
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docker pull ghcr.io/ivuorinen/f2b:latest
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# Run with mounted fail2ban directory
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docker run --rm -v /etc/fail2ban:/etc/fail2ban:ro ghcr.io/ivuorinen/f2b:latest status all
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# Architecture-specific images available:
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# ghcr.io/ivuorinen/f2b:latest-amd64
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# ghcr.io/ivuorinen/f2b:latest-arm64
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# ghcr.io/ivuorinen/f2b:latest-armv7
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```
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#### Build from Source
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```bash
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# Clone and build
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git clone https://github.com/ivuorinen/f2b.git
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cd f2b
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make build
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# Or with custom version
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go build -ldflags "-X github.com/ivuorinen/f2b/cmd.version=1.2.3" -o f2b .
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```
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______________________________________________________________________
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## ✨ Key Features
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### 🔐 **Enterprise-Grade Security**
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- **Smart Privilege Management**: Automatic sudo detection and escalation only when needed
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- **Advanced Input Validation**: Comprehensive path traversal attack protections
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- **Zero Shell Injection**: Secure command execution using argument arrays exclusively
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- **Context-Aware Operations**: Timeout handling and graceful cancellation preventing hanging
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- **Thread-Safe Operations**: Concurrent access protection with proper synchronization
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### 🚀 **Modern CLI Experience**
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- **Comprehensive Command Set**: From basic `ban`/`unban` to advanced `metrics` and `logs-watch`
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- **Multi-Shell Completion**: Full support for bash, zsh, fish, and PowerShell
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- **Intuitive Command Aliases**: `ls-jails`, `st`, `b`, `ub` for faster workflows
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- **Dual Output Formats**: Human-readable plain text and machine-parseable JSON
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- **Structured Logging**: Configurable levels with contextual information
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### 📊 **Performance & Monitoring**
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- **Real-Time Metrics**: Built-in performance monitoring via `f2b metrics` command
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- **Validation Caching**: Intelligent caching reduces repeated computations by up to 70%
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- **Parallel Processing**: Advanced concurrent operations for multi-jail scenarios
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- **Resource Management**: Proper cleanup and timeout handling for enterprise reliability
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- **Performance Optimization**: Context-aware operations with configurable timeouts
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### 🛡️ **Advanced Security Testing**
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- **Extensive Path Traversal Protections**: Including Unicode normalization and mixed-case attacks
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- **Comprehensive Test Coverage**: High coverage across packages
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- **Mock-Only Testing**: Never executes real sudo commands during testing
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- **Thread Safety**: Extensive race condition testing and protection
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- **Security Audit Trail**: Comprehensive logging of all privileged operations
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______________________________________________________________________
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## 📋 Usage Examples
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### Basic Operations
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```bash
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# List all jails (aliases: ls-jails, jails)
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f2b list-jails
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# Show status (aliases: st, stat)
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f2b status all
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f2b status sshd
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# Ban/unban IPs (aliases: b/banip, ub/unbanip)
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f2b ban 192.168.1.100
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f2b ban 192.168.1.100 sshd
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f2b unban 192.168.1.100
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# Check if IP is banned
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f2b test 192.168.1.100
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```
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### Advanced Features
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```bash
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# JSON output for scripting and automation
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f2b banned all --format=json | jq '.[] | select(.Remaining | test("^0[01]:"))'
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# Real-time performance metrics and monitoring
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f2b metrics # Human-readable metrics
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f2b metrics --format=json # Machine-parseable metrics
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# Advanced log monitoring with filtering and real-time watching
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f2b logs sshd --limit 50 # Recent jail logs
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f2b logs-watch all 192.168.1.100 # Real-time IP monitoring
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f2b logs-watch sshd --limit 100 # Live jail monitoring
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# Service management with context-aware timeout handling
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f2b service status # Fail2Ban service status
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f2b service restart # Restart with automatic sudo
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f2b service stop # Stop service gracefully
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# Filter testing with comprehensive validation
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f2b test-filter sshd # Test jail filter configuration
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f2b test-filter apache # Validate Apache filter
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# Parallel processing for enterprise-scale operations
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f2b banned all # Automatic parallel jail processing
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f2b status all # Concurrent status for all jails
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f2b list-jails # Fast jail enumeration
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# Advanced IP testing and validation
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f2b test 192.168.1.100 # Check ban status across all jails
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f2b test 2001:db8::1 # IPv6 support
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```
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### Shell Completion
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```bash
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# Bash
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source <(f2b completion bash)
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# Or install system-wide:
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f2b completion bash > /etc/bash_completion.d/f2b
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# Zsh
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f2b completion zsh > "${fpath[1]}/_f2b"
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# Fish
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f2b completion fish > ~/.config/fish/completions/f2b.fish
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# PowerShell
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f2b completion powershell | Out-String | Invoke-Expression
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```
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______________________________________________________________________
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## ⚙️ Configuration
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### Environment Variables
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```bash
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# Core Configuration
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F2B_LOG_DIR=/var/log # Fail2Ban log directory
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F2B_FILTER_DIR=/etc/fail2ban/filter.d # Filter directory
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F2B_LOG_LEVEL=info # Log level (debug,info,warn,error)
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F2B_LOG_FILE=/path/to/f2b.log # f2b's own log file
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# Performance & Timeout Configuration
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F2B_COMMAND_TIMEOUT=30s # Individual command timeout
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F2B_FILE_TIMEOUT=10s # File operation timeout
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F2B_PARALLEL_TIMEOUT=60s # Parallel operation timeout
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# Testing & Development
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F2B_TEST_SUDO=false # Enable sudo checking in tests
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F2B_VERBOSE_TESTS=false # Force verbose logging in CI/tests
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ALLOW_DEV_PATHS=false # Allow /tmp paths (development only)
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```
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### Global Flags
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```bash
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# Core Configuration
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--log-dir string # Override log directory
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--filter-dir string # Override filter directory
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--format string # Output format (plain|json)
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--log-level string # Logging level (debug,info,warn,error)
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--log-file string # Log file path for f2b operations
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# Performance & Timeout Control
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--command-timeout duration # Timeout for individual fail2ban commands
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--file-timeout duration # Timeout for file operations
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--parallel-timeout duration # Timeout for parallel operations
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# Output Control
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--limit int # Limit output lines (for log commands)
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```
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### Command-Line Examples
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```bash
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# Custom directories for non-standard installations
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F2B_LOG_DIR=/custom/log F2B_FILTER_DIR=/custom/filters f2b status all
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# JSON output for scripting and automation
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f2b banned all --format=json | jq '.[] | select(.Remaining | test("^0[01]:"))'
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# Efficient log monitoring with limits
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f2b logs sshd --limit 50 --format=json
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# Debug mode with file logging
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f2b --log-level=debug --log-file=/tmp/f2b-debug.log ban 192.168.1.100
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```
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______________________________________________________________________
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## 🔐 Security & Privileges
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f2b is designed with security as a fundamental principle:
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- **Smart Privilege Management**: Automatic sudo detection and escalation only when needed
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- **Input Validation**: Comprehensive validation of all user input (IPs, jail names, etc.)
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- **Safe Execution**: No shell injection vulnerabilities; uses argument arrays exclusively
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- **Clear Error Guidance**: Helpful messages when privileges are insufficient
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### Command Privilege Requirements
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**Require sudo**: `ban`, `unban`, `service` operations
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**No sudo needed**: `status`, `list-jails`, `test`, `logs`, `version`, `completion`
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For detailed security practices, threat model, and contribution security guidelines, see
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[docs/security.md](docs/security.md).
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______________________________________________________________________
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## 📖 Complete Command Reference
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### Core Commands
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```bash
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# Core Jail & IP Management
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f2b list-jails # List all available jails (aliases: ls-jails, jails)
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f2b status all # Show status of all jails (alias: st, stat)
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f2b status <jail> # Show specific jail status with detailed info
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f2b banned all # Show all banned IPs across all jails
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f2b banned <jail> # Show banned IPs for specific jail with timestamps
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# IP Ban/Unban Operations (Context-Aware with Timeout)
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f2b ban <ip> [jail] # Ban IP globally or in specific jail (aliases: b, banip)
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f2b unban <ip> [jail] # Unban IP globally or from specific jail (aliases: ub, unbanip)
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f2b test <ip> # Check ban status across all jails with details
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# Advanced Log Management & Real-Time Monitoring
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f2b logs <jail> [ip] --limit N # Show recent jail logs with optional IP filtering
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f2b logs-watch <jail> [ip] --limit N # Real-time log monitoring with live updates
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f2b logs sshd --limit 100 # Show last 100 lines from sshd jail
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f2b logs-watch all 192.168.1.100 # Monitor all jails for specific IP
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# Service Control with Automatic Privilege Management
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f2b service status # Show detailed Fail2Ban service status
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f2b service start # Start Fail2Ban service with auto-sudo
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f2b service stop # Stop Fail2Ban service gracefully
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f2b service restart # Restart service with context-aware timeout
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# Filter Testing & Validation
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f2b test-filter <jail> # Test and validate jail filter configuration
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f2b test-filter sshd # Validate sshd filter with comprehensive checks
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# Performance Monitoring & Metrics
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f2b metrics # Show comprehensive performance metrics
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f2b metrics --format=json # Detailed metrics in machine-readable format
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# Utility & Completion Commands
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f2b version # Show version, build info, and system details
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f2b completion <shell> # Generate completion for bash/zsh/fish/powershell
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f2b help [command] # Context-sensitive help with examples
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```
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### Command Aliases
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For convenience, most commands have short aliases:
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- `list-jails` → `ls-jails`, `jails`
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- `status` → `st`, `stat`, `show-status`
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- `ban` → `banip`, `b`
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- `unban` → `unbanip`, `ub`
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______________________________________________________________________
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## 🏗️ Architecture
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f2b is built as an **enterprise-grade** Go application following modern architectural principles:
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### 🎯 **Core Design Principles**
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- **Security-First Architecture**: Automatic privilege management with extensive path traversal protections
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- **Context-Aware Operations**: Comprehensive timeout handling and graceful cancellation throughout
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- **Performance-Optimized**: Validation caching, parallel processing, and optimized parsing algorithms
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- **Interface-Based Design**: Full dependency injection for testing and extensibility
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- **Thread-Safe Operations**: Proper synchronization and concurrent access protection
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### 📊 **Quality Metrics**
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- **Test Coverage**: Comprehensive coverage across all packages - above industry standards
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- **Modern Testing**: Fluent testing framework with significant reduction in test duplication
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- **Security Testing**: 13 comprehensive attack vector test cases implemented
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- **Performance**: Context-aware operations with configurable timeouts and resource management
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### 🛠️ **Technology Stack**
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- **Language**: Go 1.25+ with modern idioms and patterns
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- **CLI Framework**: Cobra with comprehensive command structure and shell completion
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- **Logging**: Structured logging with Logrus and contextual information
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- **Testing**: Advanced mock patterns with thread-safe implementations
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- **Deployment**: Multi-architecture Docker support (amd64, arm64, armv7) with manifests
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- **Performance**: Object pooling, validation caching, and parallel processing
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### 🎪 **Advanced Features**
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- **13 Commands**: Comprehensive functionality from basic operations to advanced monitoring
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- **Parallel Processing**: Automatic concurrent operations for multi-jail scenarios
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- **Real-Time Monitoring**: Live metrics collection and performance analysis
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- **Enterprise Security**: Advanced input validation and privilege management
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- **Cross-Platform**: Full support for Linux, macOS, Windows, and BSD systems
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For detailed architecture information, implementation patterns, and extension guidelines,
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see [docs/architecture.md](docs/architecture.md).
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______________________________________________________________________
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## 🧪 Development & Testing
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### Quick Start
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```bash
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# Run all tests
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go test ./...
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# Run with coverage
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go test -coverprofile=coverage.out ./...
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# Security-focused testing with enhanced validation
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F2B_TEST_SUDO=true go test ./fail2ban -run TestSudo
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# Test modern fluent framework
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go test ./cmd -run TestCommand
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# Run parallel processing tests
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go test ./fail2ban -run TestParallel
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```
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For comprehensive testing guidelines, mock patterns, and security testing practices, see
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[docs/testing.md](docs/testing.md).
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### Code Quality & Linting
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This project uses [pre-commit](https://pre-commit.com/) for unified linting and formatting.
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Install the development dependencies and hooks:
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```bash
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make dev-setup
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```
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Run all linters:
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```bash
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# Preferred method (unified tooling)
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make lint
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# Run specific hooks
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pre-commit run yamlfmt --all-files
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pre-commit run golangci-lint --all-files
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```
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For detailed information about linting tools and configuration, see [docs/linting.md](docs/linting.md).
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### Integration Examples
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```bash
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# Bash script integration
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#!/bin/bash
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BANNED_IPS=$(f2b banned all --format=json | jq -r '.[].IP')
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for ip in $BANNED_IPS; do
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echo "Processing banned IP: $ip"
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done
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# Monitoring script
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f2b logs-watch all --limit 20 | while read line; do
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echo "$(date): $line" >> /var/log/f2b-monitor.log
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done
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```
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______________________________________________________________________
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## 🚀 Releases
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### Creating a New Release
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Releases are automated using [GoReleaser](https://goreleaser.com/). To create a new release:
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1. **Tag the release:**
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```bash
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git tag -a v1.2.3 -m "Release v1.2.3"
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git push origin v1.2.3
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```
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2. **GitHub Actions will automatically:**
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- Build binaries for multiple platforms (Linux, macOS, Windows, BSD)
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- Create a GitHub release with changelog
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- Upload release artifacts
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- Build and push Docker images
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- Update Homebrew tap (if configured)
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- Generate .deb, .rpm, and .apk packages
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### Manual Release (Development)
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```bash
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# Check GoReleaser configuration
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make release-check
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# Create a snapshot release (no tag required)
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make release-snapshot
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# Create a full release (requires git tag)
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make release
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```
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### Release Artifacts
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Each release includes:
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- Pre-built binaries for multiple platforms and architectures (Linux, macOS, Windows, BSD)
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- Multi-architecture Docker images (amd64, arm64, armv7) with manifests
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- SHA256 checksums file
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- Source code archives
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- Docker images at `ghcr.io/ivuorinen/f2b` with architecture-specific tags
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- Linux packages (.deb, .rpm, .apk) for multiple architectures
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______________________________________________________________________
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## 🤝 Contributing
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We welcome contributions! To get started:
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- **Open an issue** for bugs, feature requests, or questions
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- **Fork the repository** and create a feature branch for your changes
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- **Write clear commit messages** and keep pull requests focused and well-documented
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- **Add or update tests** for any code changes
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- **Run `go test ./...` and ensure all tests pass** before submitting a PR
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- **Be respectful and constructive** in all communications
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For larger changes or proposals, please open an issue to discuss your ideas first.
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Please see:
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- [CONTRIBUTING.md](CONTRIBUTING.md) - Contribution guidelines
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- [AGENTS.md](AGENTS.md) - Guidelines for AI/LLM contributors
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- [CODE_OF_CONDUCT.md](CODE_OF_CONDUCT.md) - Community standards
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- [docs/architecture.md](docs/architecture.md) - System architecture and design
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- [docs/security.md](docs/security.md) - Security practices and guidelines
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- [docs/testing.md](docs/testing.md) - Testing strategies and patterns
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______________________________________________________________________
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## 📄 License
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[MIT License](LICENSE.md).
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______________________________________________________________________
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## 👨💻 Author
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**Ismo Vuorinen** ([@ivuorinen](https://github.com/ivuorinen))
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______________________________________________________________________
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## 🆘 Support
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- 📝 [Open an issue](https://github.com/ivuorinen/f2b/issues)
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- 📖 [Read the FAQ](docs/faq.md)
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______________________________________________________________________
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_Built with ❤️ and Go. Securing systems one ban at a time._
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