docs: update changelog for release

Fix the main branch name in the template CHANGELOG  file for the git
chglog tool.

.gitlab-ci.yml

@@ -5,18 +5,45 @@ before_script:
 
 stages:
   - test
+  - build
 
 format:
   stage: test
   script:
     - make format
 
-dependencies:
-  stage: test
-  script:
-    - make go-mod-tidy
-
 test:
   stage: test
   script:
     - make test
+
+build:
+  stage: build
+  only:
+    - main
+    - tags
+  script:
+    - git fetch --tags
+    - make build/snapshot
+  artifacts:
+    paths:
+      - dist/*.tar.gz
+      - dist/checksums.txt
+    expire_in: 1 day
+
+docker-gitlab:
+  stage: build
+  only:
+    - main
+    - tags
+  image: docker:stable
+  services:
+    - docker:dind
+  before_script:
+    - apk add git
+    - apk add make
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+  script:
+    - make docker/build-latest
+    - make docker/build-tag
+    - docker push registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter

.goreleaser.yml

@@ -0,0 +1,31 @@
+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+before:
+  hooks:
+    - make install-deps
+builds:
+  -
+    dir: src
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - amd64
+      - "386"
+      - arm
+      - arm64
+    goarm:
+      - "6"
+      - "7"
+
+archives:
+  -
+    files:
+    - LICENSE
+    - README.md
+    - CHANGELOG.md
+checksum:
+  name_template: 'checksums.txt'
+changelog:
+  skip: true

CHANGELOG.md

@@ -0,0 +1,30 @@
+# CHANGELOG
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog], and this project adheres to [Semantic Versioning].
+
+## [Unreleased]## [0.1.0] - 2021-03-28
+
+### Added
+- (6355c9e) feat: fail on startup if database file does not exist ([#8](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/8))
+- (4f18bf3) feat: add cli parameters for db path and metrics port ([#4](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/issues/4))
+- (91cba80) feat: export number of banned ips
+- (4b96501) feat: export bad ip count per jail
+- (0b40e5d) feat: connect to fail2ban db and extract total bad ips
+- (7ced846) feat: initial setup of metric exporter
+
+
+### Fixed
+- (0842419) fix: compile tool without cgo_enabled flag
+
+
+---
+
+*This changelog is automatically generated by [git-chglog]*
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
+[git-chglog]: https://github.com/git-chglog/git-chglog
+[Unreleased]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.1.0...main
+[0.1.0]: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/compare/0.0.0...0.1.0

Dockerfile

@@ -0,0 +1,26 @@
+# Using golang:latest instead of alpine because of issues with sqlite3
+FROM golang:latest AS build
+
+# Create build folder to compile tool
+WORKDIR /build
+
+# Copy source files to build folder and link to the /go folder
+COPY . /build
+RUN ln -s /go/src/ /build/src
+
+# Compile the tool using a Make command
+RUN make build/docker
+
+
+FROM debian:buster-slim
+
+# Create main app folder to run from
+WORKDIR /app
+
+# Copy compiled binary to release image
+COPY --from=build /build/src/exporter /app/fail2ban-prometheus-exporter
+
+# Copy init script into main app folder and set as entry point
+COPY docker/run.sh /app/
+RUN chmod +x /app/*
+ENTRYPOINT /app/run.sh

Makefile

@@ -1,15 +1,34 @@
 install-deps:
-	go mod download
+	cd src/ && go mod download
 
 # Standard go test
 test:
-	go test ./... -v -race
+	cd src/ && go test ./... -v -race
 
 # Make sure no unnecessary dependencies are present
 go-mod-tidy:
-	go mod tidy -v
+	cd src/ && go mod tidy -v
 	git diff-index --quiet HEAD
 
 format:
-	go fmt $(go list ./... | grep -v /vendor/)
-	go vet $(go list ./... | grep -v /vendor/)
+	cd src/ && go fmt $(go list ./... | grep -v /vendor/)
+	cd src/ && go vet $(go list ./... | grep -v /vendor/)
+
+generateChangelog:
+	./tools/git-chglog_linux_amd64 --config tools/chglog/config.yml 0.0.0.. > CHANGELOG.md
+
+build/snapshot:
+	./tools/goreleaser_linux_amd64 --snapshot --rm-dist --skip-publish
+
+build/release:
+	./tools/goreleaser_linux_amd64 --rm-dist --skip-publish
+
+build/docker:
+	cd src/ && go build -o exporter \
+     -ldflags '-X main.version=$(shell git describe --tags) -X main.commit=${shell git rev-parse HEAD} -X "main.date=${shell date --rfc-3339=seconds}" -X main.builtBy=docker' exporter.go
+
+docker/build-latest:
+	docker build -t registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest .
+
+docker/build-tag:
+	docker build -t registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:$(shell git describe --tags) .

README.md

@@ -1,3 +1,123 @@
 # Fail2Ban Prometheus Exporter
 
 Go tool to collect and export metrics on Fail2Ban
+
+## Table of Contents
+1. How to use
+2. Docker
+    1. Volumes
+    2. Docker run
+    3. Docker compose
+3. CLI usage
+4. Metrics
+
+## 1. How to use
+
+Run the exporter by providing it with a fail2ban database to read data from.
+Read access to the database is required.
+Once the exporter is running, metrics are available at `localhost:9191/metrics`.
+
+The default port is `9191`, but this can be modified with the `-port` flag.
+
+**Note:** By default fail2ban stores the database file at: `/var/lib/fail2ban/fail2ban.sqlite3`
+
+**Fail2Ban Jails**
+
+fail2ban can be configured to process different log files and use different rules for each one.
+These separate configurations are referred to as *jails*.
+
+For example, fail2ban can be configured to watch the system logs for failed SSH connections and Nextcloud logs for failed logins.
+In this configuration, there will be two jails - one for IPs banned from the SSH logs, and one for IPs banned from the Nextcloud logs.
+
+This tool exports several metrics *per jail*, meaning that it is possible to track how many IPs are being banned in each jail as well as the overall total.
+This can be useful to track what services are seeing more failed logins.
+
+## 2. Docker
+
+An official docker image is available on the Gitlab container registry.
+Use it by pulling the following image:
+
+```
+registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
+```
+
+Use the `:latest` tag to get the most up to date code (less stable) or use one of the version tagged images to use a specific release.
+See the [registry page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/container_registry) for all available tags.
+
+### 2.1. Volumes
+
+The docker image is designed to run by mounting the fail2ban sqlite3 database.
+The database should be mounted at: `/app/fail2ban.sqlite3`
+
+The database can be mounted with read-only permissions.
+
+### 2.2. Docker run
+
+Use the following command to run the forwarder as a docker container.
+
+```
+docker run -d \
+    --name "fail2ban-exporter" \
+    -v /var/lib/fail2ban/fail2ban.sqlite3:/app/fail2ban.sqlite3:ro \
+    -p "9191:9191"
+    registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
+```
+
+### 2.3. Docker compose
+
+The following is a simple docker-compose file to run the exporter.
+
+```
+version: "2"
+services:
+  exporter:
+    image: registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
+    volumes:
+    - /var/lib/fail2ban/fail2ban.sqlite3:/app/fail2ban.sqlite3:ro
+    ports:
+    - "9191:9191"
+```
+
+## 3. CLI usage
+
+```
+$ fail2ban-prometheus-exporter -h
+
+  -db string
+        path to the fail2ban sqlite database
+  -port int
+        port to use for the metrics server (default 9191)
+  -version
+        show version info and exit
+```
+
+## 4. Metrics
+
+Access exported metrics at `/metrics` (on the provided port).
+
+**Note:** All metric names include the `fail2ban_` prefix to make sure they are unique and easier to find.
+
+Exposed metrics:
+* `up` - Returns 1 if the service is up
+* `bad_ips` (per jail)
+    * A *bad IP* is defined as an IP that has been banned at least once in the past
+    * Bad IPs are counted per jail
+* `banned_ips` (per jail)
+    * A *banned IP* is defined as an IP that is currently banned on the firewall
+    * Banned IPs are counted per jail
+
+**Sample**
+
+```
+# HELP fail2ban_bad_ips Number of bad IPs stored in the database (per jail).
+# TYPE fail2ban_bad_ips gauge
+fail2ban_bad_ips{jail="jail1"} 6
+fail2ban_bad_ips{jail="jail2"} 8
+# HELP fail2ban_banned_ips Number of banned IPs stored in the database (per jail).
+# TYPE fail2ban_banned_ips gauge
+fail2ban_banned_ips{jail="jail1"} 3
+fail2ban_banned_ips{jail="jail2"} 2
+# HELP fail2ban_up Was the last fail2ban query successful.
+# TYPE fail2ban_up gauge
+fail2ban_up 1
+```

docker/run.sh

@@ -0,0 +1,9 @@
+#/bin/sh
+
+# Print version to logs for debugging purposes
+/app/fail2ban-prometheus-exporter -version
+
+# Start the exporter (use exec to support graceful shutdown)
+# Inspired by: https://akomljen.com/stopping-docker-containers-gracefully/
+exec /app/fail2ban-prometheus-exporter \
+    -db /app/fail2ban.sqlite3

exporter.go

@@ -1,7 +0,0 @@
-package main
-
-import "log"
-
-func main() {
-	log.Println("Not yet implemented")
-}

go.mod

@@ -1,3 +0,0 @@
-module fail2ban-prometheus-exporter
-
-go 1.15

src/cfg/cfg.go

@@ -0,0 +1,48 @@
+package cfg
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+const (
+	minServerPort = 1000
+	maxServerPort = 65535
+)
+
+type AppSettings struct {
+	VersionMode    bool
+	MetricsPort    int
+	Fail2BanDbPath string
+}
+
+func Parse() *AppSettings {
+	appSettings := &AppSettings{}
+	flag.BoolVar(&appSettings.VersionMode, "version", false, "show version info and exit")
+	flag.IntVar(&appSettings.MetricsPort, "port", 9191, "port to use for the metrics server")
+	flag.StringVar(&appSettings.Fail2BanDbPath, "db", "", "path to the fail2ban sqlite database")
+
+	flag.Parse()
+	appSettings.validateFlags()
+	return appSettings
+}
+
+func (settings *AppSettings) validateFlags() {
+	var flagsValid = true
+	if !settings.VersionMode {
+		if settings.Fail2BanDbPath == "" {
+			fmt.Println("missing flag 'db'")
+			flagsValid = false
+		}
+		if settings.MetricsPort < minServerPort || settings.MetricsPort > maxServerPort {
+			fmt.Printf("invalid server port, must be within %d and %d (found %d)\n",
+				minServerPort, maxServerPort, settings.MetricsPort)
+			flagsValid = false
+		}
+	}
+	if !flagsValid {
+		flag.Usage()
+		os.Exit(1)
+	}
+}

src/db/db.go

@@ -0,0 +1,79 @@
+package db
+
+import (
+	"database/sql"
+	"log"
+	"os"
+)
+
+const queryBadIpsPerJail = "SELECT j.name, (SELECT COUNT(1) FROM bips b WHERE j.name = b.jail) FROM jails j"
+const queryBannedIpsPerJail = "SELECT j.name, (SELECT COUNT(1) FROM bans b WHERE j.name = b.jail) FROM jails j"
+
+type Fail2BanDB struct {
+	DatabasePath string
+	sqliteDB     *sql.DB
+}
+
+func MustConnectToDb(databasePath string) *Fail2BanDB {
+	if _, err := os.Stat(databasePath); os.IsNotExist(err) {
+		log.Fatalf("database path does not exist: %v", err)
+	}
+	db, err := sql.Open("sqlite3", databasePath)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return &Fail2BanDB{
+		DatabasePath: databasePath,
+		sqliteDB:     db,
+	}
+}
+
+func (db *Fail2BanDB) CountBannedIpsPerJail() (map[string]int, error) {
+	return db.RunJailNameToCountQuery(queryBannedIpsPerJail)
+}
+
+func (db *Fail2BanDB) CountBadIpsPerJail() (map[string]int, error) {
+	return db.RunJailNameToCountQuery(queryBadIpsPerJail)
+}
+
+func (db *Fail2BanDB) RunJailNameToCountQuery(query string) (map[string]int, error) {
+	stmt, err := db.sqliteDB.Prepare(query)
+	defer db.mustCloseStatement(stmt)
+
+	if err != nil {
+		return nil, err
+	}
+
+	jailNameToCountMap := map[string]int{}
+	rows, err := stmt.Query()
+	if err != nil {
+		return nil, err
+	}
+	if rows == nil {
+		return jailNameToCountMap, nil
+	}
+
+	for rows.Next() {
+		if rows.Err() != nil {
+			return nil, err
+		}
+		jailName := ""
+		count := 0
+		err = rows.Scan(&jailName, &count)
+		if err != nil {
+			return nil, err
+		}
+
+		jailNameToCountMap[jailName] = count
+	}
+	return jailNameToCountMap, nil
+}
+
+func (db *Fail2BanDB) mustCloseStatement(stmt *sql.Stmt) {
+	if stmt != nil {
+		err := stmt.Close()
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+}

src/exporter.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"fail2ban-prometheus-exporter/cfg"
+	fail2banDb "fail2ban-prometheus-exporter/db"
+	"fmt"
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"log"
+	"net/http"
+)
+
+const namespace = "fail2ban"
+
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "unknown"
+	builtBy = "unknown"
+
+	metricUp = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "up"),
+		"Was the last fail2ban query successful.",
+		nil, nil,
+	)
+	metricBannedIpsPerJail = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "banned_ips"),
+		"Number of banned IPs stored in the database (per jail).",
+		[]string{"jail"}, nil,
+	)
+	metricBadIpsPerJail = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "bad_ips"),
+		"Number of bad IPs stored in the database (per jail).",
+		[]string{"jail"}, nil,
+	)
+)
+
+type Exporter struct {
+	db *fail2banDb.Fail2BanDB
+}
+
+func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
+	ch <- metricUp
+	ch <- metricBadIpsPerJail
+	ch <- metricBannedIpsPerJail
+}
+
+func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
+	ch <- prometheus.MustNewConstMetric(
+		metricUp, prometheus.GaugeValue, 1,
+	)
+	e.collectBadIpsPerJailMetrics(ch)
+	e.collectBannedIpsPerJailMetrics(ch)
+}
+
+func (e *Exporter) collectBadIpsPerJailMetrics(ch chan<- prometheus.Metric) {
+	jailNameToCountMap, err := e.db.CountBadIpsPerJail()
+	if err != nil {
+		log.Print(err)
+	}
+
+	for jailName, count := range jailNameToCountMap {
+		ch <- prometheus.MustNewConstMetric(
+			metricBadIpsPerJail, prometheus.GaugeValue, float64(count), jailName,
+		)
+	}
+}
+
+func (e *Exporter) collectBannedIpsPerJailMetrics(ch chan<- prometheus.Metric) {
+	jailNameToCountMap, err := e.db.CountBannedIpsPerJail()
+	if err != nil {
+		log.Print(err)
+	}
+
+	for jailName, count := range jailNameToCountMap {
+		ch <- prometheus.MustNewConstMetric(
+			metricBannedIpsPerJail, prometheus.GaugeValue, float64(count), jailName,
+		)
+	}
+}
+
+func printAppVersion() {
+	fmt.Println(version)
+	fmt.Printf("    build date:  %s\r\n    commit hash: %s\r\n    built by:    %s\r\n", date, commit, builtBy)
+}
+
+func main() {
+	appSettings := cfg.Parse()
+	if appSettings.VersionMode {
+		printAppVersion()
+	} else {
+		log.Print("starting fail2ban exporter")
+
+		exporter := &Exporter{
+			db: fail2banDb.MustConnectToDb(appSettings.Fail2BanDbPath),
+		}
+		prometheus.MustRegister(exporter)
+
+		http.Handle("/metrics", promhttp.Handler())
+		log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", appSettings.MetricsPort), nil))
+	}
+}

src/go.mod

@@ -0,0 +1,8 @@
+module fail2ban-prometheus-exporter
+
+go 1.15
+
+require (
+	github.com/mattn/go-sqlite3 v1.14.6
+	github.com/prometheus/client_golang v1.9.0
+)

src/go.sum

@@ -0,0 +1,402 @@
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+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
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+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=

tools/chglog/CHANGELOG.tpl.md

@@ -0,0 +1,60 @@
+# CHANGELOG
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog], and this project adheres to [Semantic Versioning].
+
+{{ if .Versions -}}
+## [Unreleased]
+{{- if .Unreleased.CommitGroups }}
+{{ template "commits" .Unreleased.CommitGroups }}
+{{- end -}}
+
+{{- if .Unreleased.NoteGroups -}}
+{{ template "notes" .Unreleased.NoteGroups }}
+{{- end -}}
+{{- end -}}
+
+{{ range .Versions -}}
+## {{ if .Tag.Previous }}[{{ .Tag.Name }}]{{ else }}{{ .Tag.Name }}{{ end }} - {{ datetime "2006-01-02" .Tag.Date }}
+{{ template "commits" .CommitGroups }}
+{{- if .NoteGroups -}}
+{{ template "notes" .NoteGroups }}
+{{- end -}}
+{{ end }}
+---
+
+*This changelog is automatically generated by [git-chglog]*
+
+[Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
+[Semantic Versioning]: https://semver.org/spec/v2.0.0.html
+[git-chglog]: https://github.com/git-chglog/git-chglog
+
+{{- if .Versions }}
+[Unreleased]: {{ .Info.RepositoryURL }}/compare/{{ $latest := index .Versions 0 }}{{ $latest.Tag.Name }}...main
+{{ range .Versions -}}
+{{ if .Tag.Previous -}}
+[{{ .Tag.Name }}]: {{ $.Info.RepositoryURL }}/compare/{{ .Tag.Previous.Name }}...{{ .Tag.Name }}
+{{ end -}}
+{{ end -}}
+{{ end -}}
+
+{{- define "notes" }}
+{{- range . -}}
+### {{ .Title }}
+{{ range .Notes -}}
+- {{ .Body }}
+{{ end }}
+{{ end }}
+{{ end -}}
+
+{{- define "commits" }}
+{{- range . -}}
+{{ if or (eq .RawTitle "feat") (eq .RawTitle "fix") }}
+### {{ .Title }}
+{{ range .Commits -}}
+- ({{ .Hash.Short }}) {{ if .Scope }}**{{ .Scope }}:** {{ end }}{{ .Header }}
+{{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}

tools/chglog/config.yml

@@ -0,0 +1,23 @@
+style: gitlab
+template: CHANGELOG.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+options:
+  commit_groups:
+    title_maps:
+      feat: Added
+      fix: Fixed
+      revert: Reverted
+  header:
+    pattern: "^(\\w*)\\:\\s(.*)$"
+    pattern_maps:
+      - Type
+      - Subject
+  notes:
+    keywords:
+      - BREAKING CHANGE
+      - Changed
+      - Deprecated
+      - Removed
+      - Security