44 Commits

Author SHA1 Message Date
235d34114b merge: chore/exclude-new-merge-messages-from-changelog
* Merge branch 'chore/exclude-new-merge-messages-from-changelog' into 'main'
* See merge request hectorjsmith/fail2ban-prometheus-exporter!104
* Merged by: Hector <hector@hjs.dev>
2023-07-03 07:18:37 +00:00
29d03c5a88 chore: exclude new merge messages from changelog (!104)
* Update the goreleaser config to exclude the new merge commit messages

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/104
2023-07-03 07:18:37 +00:00
a388773836 merge: chore/dependency-updates
* Merge branch 'chore/dependency-updates' into 'main'
* See merge request hectorjsmith/fail2ban-prometheus-exporter!103
* Merged by: Hector <hector@hjs.dev>
2023-07-03 07:03:14 +00:00
fdd223c96b chore: dependency updates (!103)
* Update dependencies to their latest versions

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/103
2023-07-03 07:03:14 +00:00
fe039c0787 Merge branch 'docs/add-go-report-card-to-readme' into 'main'
docs: add go report card to readme

See merge request hectorjsmith/fail2ban-prometheus-exporter!102
2023-06-23 20:42:46 +00:00
426011fe14 docs: add go report card to readme (!102)
* Add a badge with the project's go report card to the project `README` file

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/102
2023-06-23 20:42:46 +00:00
f877fcb79d Merge branch 'ci/fix-release-step-script' into 'main'
ci: fix release step script

See merge request hectorjsmith/fail2ban-prometheus-exporter!101
2023-06-22 21:52:31 +00:00
8c67048868 ci: fix release step script (!101)
* Fix the yaml config for the release step to handle a multi-line command

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/101
2023-06-22 21:52:31 +00:00
0a132c83df Merge branch 'docs/add-dry-run-command-to-readme' into 'main'
docs: add dry run flag to readme

See merge request hectorjsmith/fail2ban-prometheus-exporter!100
2023-06-22 18:37:01 +00:00
e46da3e7dd docs: add dry run flag to readme (!100)
* Update `README` to include the new `--dry-run` flag

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/100
2023-06-22 18:37:01 +00:00
18000cf9ef Merge branch 'ci/add-go-vet-to-test-stage' into 'main'
ci: add go vet to test stage

See merge request hectorjsmith/fail2ban-prometheus-exporter!99
2023-06-22 18:24:15 +00:00
b6cec83503 ci: add go vet to test stage (!99)
* Add `go vet` to the test stage of the Gitlab CI/CD pipeline
* Fix issues raised by `go vet`

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/99
2023-06-22 18:24:15 +00:00
8d457da2b9 Merge branch 'feat/add-new-dry-run-mode' into 'main'
feat: add new dry run mode

See merge request hectorjsmith/fail2ban-prometheus-exporter!98
2023-06-22 16:09:36 +00:00
9c1a10e309 feat: add new dry run mode (!98)
* Add a new *dry-run* mode to exit just before running the server
* This allows testing that the socket is working before starting the server

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/98
2023-06-22 16:09:36 +00:00
5275d280be Merge branch 'build/disable-cgo-for-makefile-build' into 'main'
build: disable cgo for makefile build

See merge request hectorjsmith/fail2ban-prometheus-exporter!97
2023-06-22 15:22:42 +00:00
b9ab77d62d build: disable cgo for makefile build (!97)
* Disable `CGO` in the makefile build to avoid dependencies on external C libraries
* This also aligns with the build done for releases and docker images

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/97
2023-06-22 15:22:42 +00:00
5f879e1921 Merge branch 'feat/print-fail2ban-version-on-startup' into 'main'
feat: print fail2ban version on startup

See merge request hectorjsmith/fail2ban-prometheus-exporter!96
2023-06-22 15:16:12 +00:00
8e0284d9f0 feat: print fail2ban version on startup (!96)
* Print the version reported by `fail2ban-server` when the exporter starts up
* Logs an error if the connection to the server fails

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/96
2023-06-22 15:16:12 +00:00
d1b65a2134 Merge branch 'chore/replace-ioutils-with-os-calls' into 'main'
chore: replace ioutil with os calls

See merge request hectorjsmith/fail2ban-prometheus-exporter!95
2023-06-22 14:33:57 +00:00
dc342e3051 chore: replace ioutil with os calls (!95)
* Replace calls to deprecated `ioutil` functions with the `os` package

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/95
2023-06-22 14:33:56 +00:00
1508693dd6 Merge branch 'chore/rename-examples-folder' into 'main'
chore: rename examples folder

See merge request hectorjsmith/fail2ban-prometheus-exporter!94
2023-06-22 14:22:31 +00:00
594d9f26a1 chore: rename examples folder (!94)
* Rename the `examples` folder to `_examples` to distinguish it from source code folders

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/94
2023-06-22 14:22:31 +00:00
938860d5dc Merge branch 'set-dependency-scanning-config-1' into 'main'
ci: configure dependency scanning

See merge request hectorjsmith/fail2ban-prometheus-exporter!93
2023-06-21 17:50:43 +00:00
cfa20f6c1d ci: configure dependency scanning (!93)
* Enable dependency scanning CI pipeline

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/93
2023-06-21 17:50:43 +00:00
211a5015d0 Merge branch 'chore/update-makefile-commands' into 'main'
chore: update makefile commands

See merge request hectorjsmith/fail2ban-prometheus-exporter!92
2023-06-21 15:02:11 +00:00
56ecc03341 chore: update makefile commands (!92)
* Tweak makefile commands and file formatting
* Remove command and build step for go mod formatting
* Add command to update project dependencies
* Add make command to list all make commands

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/92
2023-06-21 15:02:11 +00:00
b32bbeb1cd Merge branch 'fix/set-http-server-timeouts' into 'main'
fix: set http server timeouts

See merge request hectorjsmith/fail2ban-prometheus-exporter!91
2023-06-21 11:09:39 +00:00
37b67643e8 fix: set http server timeouts (!91)
* Set timeout values when configuring the HTTP server to mitigate "Slowloris" vulnerability

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/91
2023-06-21 11:09:39 +00:00
1eec68b49b Merge branch 'refactor/move-server-setup-code-to-new-package' into 'main'
refactor: move server setup code to new package

See merge request hectorjsmith/fail2ban-prometheus-exporter!90
2023-06-21 10:58:43 +00:00
11c4b26c0b refactor: move server setup code to new package (!90)
* Move code setting up the HTTP server to it's own package
* This helps clean up the `main` function and make it easier to read
* Rename the `BasicAuthMiddleware` to remove reference to Basic since it can now handle any type of auth type

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/90
2023-06-21 10:58:43 +00:00
41b05f7e16 Merge branch 'refactor/rewrite-auth-handler-code' into 'main'
refactor: rewrite auth handler code

See merge request hectorjsmith/fail2ban-prometheus-exporter!89
2023-06-21 10:31:33 +00:00
3cff8ccd64 refactor: rewrite auth handler code (!89)
* Rewrite the code handling basic auth to make it easier to extend for other types of auth.
* The behaviour of the existing code is maintained.
* No changes to how basic auth is configured from a user's perspective.

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/89
2023-06-21 10:31:33 +00:00
3215fe5f4c Merge branch 'refactor/replace-cli-parser-with-kong' into 'main'
refactor: replace cli parser with kong

See merge request hectorjsmith/fail2ban-prometheus-exporter!88
2023-06-20 20:16:23 +00:00
43cab7adc2 refactor: replace cli parser with kong (!88)
https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/88
2023-06-20 20:16:23 +00:00
d584345fc6 Merge branch 'ci/add-sast-step-to-pipeline' into 'main'
ci: add sast step to pipeline

See merge request hectorjsmith/fail2ban-prometheus-exporter!87
2023-06-20 17:24:16 +00:00
8974395bba ci: add sast step to pipeline (!87)
https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/87
2023-06-20 17:24:16 +00:00
ad593dbd9b Merge branch 'docs/update-readme-with-latest-changes' into 'main'
docs: update readme with latest changes

See merge request hectorjsmith/fail2ban-prometheus-exporter!86
2023-06-20 16:34:25 +00:00
f1e69fc4da docs: update readme with latest changes (!86)
Update `README` to reflect recent changes in the project build process.

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/86
2023-06-20 16:34:25 +00:00
30b92d61da Merge branch 'feat/tag-docker-images-with-extra-labels' into 'main'
feat: tag docker images with extra labels

See merge request hectorjsmith/fail2ban-prometheus-exporter!85
2023-06-20 07:20:11 +00:00
812f506432 feat: tag docker images with extra labels (!85)
Add a new build step to tag docker images with extra labels:
- `:latest`
- `:<major>`
- `:<major>.<minor>`

This job is only triggered on main release tags.

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/85
2023-06-20 07:20:11 +00:00
f29e127f5f Merge branch 'chore/update-go-and-dependencies' into 'main'
chore: update go and dependencies

See merge request hectorjsmith/fail2ban-prometheus-exporter!84
2023-06-19 21:59:42 +00:00
d7f9b5c4ab chore: update go and dependencies
Update Go version to 1.20
Update dependencies to latest versions
2023-06-19 21:59:42 +00:00
56cc0b7901 Merge branch 'fix/disable-cgo-in-build' into 'main'
fix: disable cgo in goreleaser build

See merge request hectorjsmith/fail2ban-prometheus-exporter!83
2023-06-19 21:27:09 +00:00
53a1f12f39 fix: disable cgo in goreleaser build 2023-06-19 21:27:09 +00:00
29 changed files with 528 additions and 891 deletions

View File

@ -6,11 +6,12 @@ stages:
.go_template:
image: golang:latest
dependencies:
extends: .go_template
sast:
stage: test
script:
- make check/dependencies
include:
- template: Security/SAST.gitlab-ci.yml
- template: Security/Dependency-Scanning.gitlab-ci.yml
format:
extends: .go_template
@ -18,6 +19,13 @@ format:
script:
- make check/fmt
vet:
extends: .go_template
stage: test
allow_failure: true
script:
- make vet
test:
extends: .go_template
stage: test
@ -47,8 +55,6 @@ release:
rules:
- if: $CI_COMMIT_TAG =~ /^v.*$/
script: |
# GITLAB_TOKEN is needed to create GitLab releases.
# DOCKER_* are needed to push Docker images.
docker run --rm --privileged \
-v $PWD:/go/src/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter \
-w /go/src/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter \
@ -56,3 +62,17 @@ release:
-e DOCKER_USERNAME -e DOCKER_PASSWORD -e DOCKER_REGISTRY \
-e GITLAB_TOKEN \
goreleaser/goreleaser release --clean
tag images:
stage: release
image: docker:stable
services:
- docker:dind
needs:
- release
rules:
- if: $CI_COMMIT_TAG =~ /^v\d+\.\d+\.\d+$/
variables:
IMAGE_NAME: registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
script:
- ./.gitlab-ci/tagLatestImage.sh

14
.gitlab-ci/tagLatestImage.sh Executable file
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@ -0,0 +1,14 @@
#!/bin/sh
VERSION=`echo $CI_COMMIT_TAG | cut -c 2-`
MAJOR=`echo $VERSION | cut -d "." -f 1`
MINOR=`echo $VERSION | cut -d "." -f 2`
echo "version: $VERSION (major: $MAJOR; minor: $MINOR)"
docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
docker pull $IMAGE_NAME:$VERSION
docker tag $IMAGE_NAME:$VERSION $IMAGE_NAME:latest
docker tag $IMAGE_NAME:$VERSION $IMAGE_NAME:$MAJOR
docker tag $IMAGE_NAME:$VERSION $IMAGE_NAME:$MAJOR.$MINOR
docker push $IMAGE_NAME

View File

@ -1,6 +1,6 @@
project_name: fail2ban_exporter
builds:
-
- env: [CGO_ENABLED=0]
binary: fail2ban_exporter
goos:
- linux
@ -43,3 +43,4 @@ changelog:
filters:
exclude:
- "^Merge"
- "^merge"

View File

@ -1,23 +1,45 @@
.PHONY: download test fmt check/dependencies check/fmt build build/docker
# List make commands
.PHONY: ls
ls:
cat Makefile | grep "^[a-zA-Z#].*" | cut -d ":" -f 1 | sed s';#;\n#;'g
# Download dependencies
.PHONY: download
download:
go mod download
# Update project dependencies
.PHONY: update
update:
go get -u
go mod download
go mod tidy
# Run project tests
.PHONY: test
test: download
go test ./... -v -race
# Look for "suspicious constructs" in source code
.PHONY: vet
vet: download
go vet ./...
# Format code
.PHONY: fmt
fmt: download
go mod tidy
go fmt ./...
check/dependencies: download
go mod tidy -v
git diff-index --quiet HEAD
# Check for unformatted go code
.PHONY: check/fmt
check/fmt: download
test -z $(shell gofmt -l .)
# Build project
.PHONY: build
build:
go build \
CGO_ENABLED=0 go build \
-ldflags "\
-X main.version=${shell git describe --tags} \
-X main.commit=${shell git rev-parse HEAD} \
@ -27,5 +49,7 @@ build:
-o fail2ban_exporter \
exporter.go
# Build project docker container
.PHONY: build/docker
build/docker: build
docker build -t fail2ban-prometheus-exporter .

View File

@ -1,6 +1,7 @@
# Fail2Ban Prometheus Exporter
[![Pipeline](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/badges/main/pipeline.svg)](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter)
[![Go Report Card](https://goreportcard.com/badge/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter)](https://goreportcard.com/report/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter)
Collect metrics from a running fail2ban instance.
@ -22,7 +23,7 @@ The following command will start collecting metrics from the `/var/run/fail2ban/
```
$ fail2ban_exporter --collector.f2b.socket=/var/run/fail2ban/fail2ban.sock --web.listen-address=":9191"
2022/02/20 09:54:06 fail2ban exporter version 0.5.0
2022/02/20 09:54:06 fail2ban exporter version 0.8.1
2022/02/20 09:54:06 starting server at :9191
2022/02/20 09:54:06 reading metrics from fail2ban socket: /var/run/fail2ban/fail2ban.sock
2022/02/20 09:54:06 metrics available at '/metrics'
@ -31,6 +32,9 @@ $ fail2ban_exporter --collector.f2b.socket=/var/run/fail2ban/fail2ban.sock --web
Binary files for each release can be found on the [releases](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases) page.
There is also an [example systemd service file](/_examples/systemd/fail2ban_exporter.service) included in the repository.
This is a starting point to run the exporter as a service.
### 1.2. Docker
**Docker run**
@ -55,7 +59,7 @@ services:
- "9191:9191"
```
Use the `:latest` tag to get the latest stable release. Or use the `:nightly` tag for the latest (unstable) version.
Use the `:latest` tag to get the latest stable release.
See the [registry page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/container_registry) for all available tags.
**NOTE:** While it is possible to mount the `fail2ban.sock` file directly, it is recommended to mount the parent folder instead.
@ -100,7 +104,7 @@ Status for the jail: sshd
### 2.1. Grafana
The metrics exported by this tool are compatible with Prometheus and Grafana.
A sample grafana dashboard can be found in the [grafana.json](/examples/grafana/dashboard.json) file.
A sample grafana dashboard can be found in the [grafana.json](/_examples/grafana/dashboard.json) file.
Just import the contents of this file into a new Grafana dashboard to get started.
The dashboard supports displaying data from multiple exporters. Use the `instance` dashboard variable to select which ones to display.
@ -114,23 +118,31 @@ There are no configuration files.
**CLI flags**
```
usage: exporter [<flags>]
🚀 Collect prometheus metrics from a running Fail2Ban instance
Flags:
-h, --help Show context-sensitive help (also try --help-long and --help-man).
-v, --version show version info and exit
-h, --help Show context-sensitive help.
-v, --version Show version info and exit
--dry-run Attempt to connect to the fail2ban socket then exit
before starting the server
--web.listen-address=":9191" Address to use for the metrics server
($F2B_WEB_LISTEN_ADDRESS)
--collector.f2b.socket="/var/run/fail2ban/fail2ban.sock"
path to the fail2ban server socket
--collector.textfile.directory=""
directory to read text files with metrics from
--web.listen-address=":9191"
address to use for the metrics server
--web.basic-auth.username=""
username to use to protect endpoints with basic auth
--web.basic-auth.password=""
password to use to protect endpoints with basic auth
Path to the fail2ban server socket
($F2B_COLLECTOR_SOCKET)
--collector.f2b.exit-on-socket-connection-error
when set to true the exporter will immediately exit on a fail2ban socket connection error
When set to true the exporter will immediately
exit on a fail2ban socket connection error
($F2B_EXIT_ON_SOCKET_CONN_ERROR)
--collector.textfile.directory=STRING
Directory to read text files with metrics from
($F2B_COLLECTOR_TEXT_PATH)
--web.basic-auth.username=STRING
Username to use to protect endpoints with basic auth
($F2B_WEB_BASICAUTH_USER)
--web.basic-auth.password=STRING
Password to use to protect endpoints with basic auth
($F2B_WEB_BASICAUTH_PASS)
```
**Environment variables**
@ -149,12 +161,13 @@ If both are specified, the CLI flag takes precedence.
## 4. Building from source
The simplest way to build the project is to run the `build/snapshot` make command.
This will use `goreleaser` to build out binaries and archives for the project.
Binaries are stored in the `dist/` folder.
Building from source has the following dependencies:
- Go v1.20
- Make
Alternatively, `go mod download` and `go build` can be used from the `src/` folder to build out the project.
This will download dependencies and build the project.
From there, simply run `make build`
This will download the necessary dependencies and build a `fail2ban_exporter` binary in the root of the project.
## 5. Textfile metrics

29
auth/basic.go Normal file
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@ -0,0 +1,29 @@
package auth
import (
"fmt"
"net/http"
)
func NewBasicAuthProvider(username, password string) AuthProvider {
return &basicAuthProvider{
hashedAuth: encodeBasicAuth(username, password),
}
}
type basicAuthProvider struct {
hashedAuth string
}
func (p *basicAuthProvider) IsAllowed(request *http.Request) bool {
username, password, ok := request.BasicAuth()
if !ok {
return false
}
requestAuth := encodeBasicAuth(username, password)
return p.hashedAuth == requestAuth
}
func encodeBasicAuth(username, password string) string {
return HashString(fmt.Sprintf("%s:%s", username, password))
}

53
auth/basic_test.go Normal file
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@ -0,0 +1,53 @@
package auth
import (
"net/http"
"net/http/httptest"
"testing"
)
func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithCorrectCreds_THEN_TrueReturned(t *testing.T) {
// assemble
username := "u1"
password := HashString("abc")
request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
request.SetBasicAuth(username, password)
provider := NewBasicAuthProvider(username, password)
// act
result := provider.IsAllowed(request)
// assert
if !result {
t.Errorf("expected request to be allowed, but failed")
}
}
func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithoutCreds_THEN_FalseReturned(t *testing.T) {
// assemble
request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
provider := NewBasicAuthProvider("u1", "p1")
// act
result := provider.IsAllowed(request)
// assert
if result {
t.Errorf("expected request to be denied, but was allowed")
}
}
func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithWrongCreds_THEN_FalseReturned(t *testing.T) {
// assemble
request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
request.SetBasicAuth("wrong", "pw")
provider := NewBasicAuthProvider("u1", "p1")
// act
result := provider.IsAllowed(request)
// assert
if result {
t.Errorf("expected request to be denied, but was allowed")
}
}

14
auth/empty.go Normal file
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@ -0,0 +1,14 @@
package auth
import "net/http"
func NewEmptyAuthProvider() AuthProvider {
return &emptyAuthProvider{}
}
type emptyAuthProvider struct {
}
func (p *emptyAuthProvider) IsAllowed(request *http.Request) bool {
return true
}

36
auth/empty_test.go Normal file
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@ -0,0 +1,36 @@
package auth
import (
"net/http"
"net/http/httptest"
"testing"
)
func Test_GIVEN_EmptyAuth_WHEN_CallingIsAllowedWithoutAuth_THEN_TrueReturned(t *testing.T) {
// assemble
request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
provider := NewEmptyAuthProvider()
// act
response := provider.IsAllowed(request)
// assert
if !response {
t.Errorf("expected request to be allowed, but failed")
}
}
func Test_GIVEN_EmptyAuth_WHEN_CallingIsAllowedWithAuth_THEN_TrueReturned(t *testing.T) {
// assemble
request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
request.SetBasicAuth("user", "pass")
provider := NewEmptyAuthProvider()
// act
response := provider.IsAllowed(request)
// assert
if !response {
t.Errorf("expected request to be allowed, but failed")
}
}

View File

@ -5,7 +5,7 @@ import (
"encoding/hex"
)
func Hash(data []byte) []byte {
func hash(data []byte) []byte {
if len(data) == 0 {
return []byte{}
}
@ -14,5 +14,5 @@ func Hash(data []byte) []byte {
}
func HashString(data string) string {
return hex.EncodeToString(Hash([]byte(data)))
return hex.EncodeToString(hash([]byte(data)))
}

View File

@ -1,31 +0,0 @@
package auth
import (
"net/http"
)
type BasicAuthProvider interface {
Enabled() bool
DoesBasicAuthMatch(username, password string) bool
}
func BasicAuthMiddleware(handlerFunc http.HandlerFunc, basicAuthProvider BasicAuthProvider) http.HandlerFunc {
if basicAuthProvider.Enabled() {
return func(w http.ResponseWriter, r *http.Request) {
if doesBasicAuthMatch(r, basicAuthProvider) {
handlerFunc.ServeHTTP(w, r)
} else {
w.WriteHeader(http.StatusUnauthorized)
}
}
}
return handlerFunc
}
func doesBasicAuthMatch(r *http.Request, basicAuthProvider BasicAuthProvider) bool {
rawUsername, rawPassword, ok := r.BasicAuth()
if ok {
return basicAuthProvider.DoesBasicAuthMatch(rawUsername, rawPassword)
}
return false
}

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@ -1,58 +0,0 @@
package auth
import (
"net/http"
"net/http/httptest"
"testing"
)
type testAuthProvider struct {
enabled bool
match bool
}
func (p testAuthProvider) Enabled() bool {
return p.enabled
}
func (p testAuthProvider) DoesBasicAuthMatch(username, password string) bool {
return p.match
}
func newTestRequest() *http.Request {
return httptest.NewRequest(http.MethodGet, "http://example.com", nil)
}
func executeBasicAuthMiddlewareTest(t *testing.T, authEnabled bool, authMatches bool, expectedCode int, expectedCallCount int) {
callCount := 0
testHandler := func(w http.ResponseWriter, r *http.Request) {
callCount++
}
handler := BasicAuthMiddleware(testHandler, testAuthProvider{enabled: authEnabled, match: authMatches})
recorder := httptest.NewRecorder()
request := newTestRequest()
if authEnabled {
request.SetBasicAuth("test", "test")
}
handler.ServeHTTP(recorder, request)
if recorder.Code != expectedCode {
t.Errorf("statusCode = %v, want %v", recorder.Code, expectedCode)
}
if callCount != expectedCallCount {
t.Errorf("callCount = %v, want %v", callCount, expectedCallCount)
}
}
func Test_GIVEN_DisabledBasicAuth_WHEN_MethodCalled_THEN_RequestProcessed(t *testing.T) {
executeBasicAuthMiddlewareTest(t, false, false, http.StatusOK, 1)
}
func Test_GIVEN_EnabledBasicAuth_WHEN_MethodCalledWithCorrectCredentials_THEN_RequestProcessed(t *testing.T) {
executeBasicAuthMiddlewareTest(t, true, true, http.StatusOK, 1)
}
func Test_GIVEN_EnabledBasicAuth_WHEN_MethodCalledWithIncorrectCredentials_THEN_RequestRejected(t *testing.T) {
executeBasicAuthMiddlewareTest(t, true, false, http.StatusUnauthorized, 0)
}

9
auth/provider.go Normal file
View File

@ -0,0 +1,9 @@
package auth
import (
"net/http"
)
type AuthProvider interface {
IsAllowed(*http.Request) bool
}

View File

@ -1,25 +0,0 @@
package cfg
import "gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
type hashedBasicAuth struct {
username string
password string
}
func newHashedBasicAuth(rawUsername, rawPassword string) *hashedBasicAuth {
return &hashedBasicAuth{
username: auth.HashString(rawUsername),
password: auth.HashString(rawPassword),
}
}
func (p *hashedBasicAuth) Enabled() bool {
return len(p.username) > 0 && len(p.password) > 0
}
func (p *hashedBasicAuth) DoesBasicAuthMatch(rawUsername, rawPassword string) bool {
username := auth.HashString(rawUsername)
password := auth.HashString(rawPassword)
return username == p.username && password == p.password
}

View File

@ -1,60 +0,0 @@
package cfg
import "testing"
func Test_hashedBasicAuth_DoesBasicAuthMatch(t *testing.T) {
type args struct {
username string
password string
}
type fields struct {
username string
password string
}
tests := []struct {
name string
fields fields
args args
want bool
}{
{"Happy test #1", fields{username: "1234", password: "1234"}, args{username: "1234", password: "1234"}, true},
{"Happy test #2", fields{username: "test", password: "1234"}, args{username: "test", password: "1234"}, true},
{"Happy test #3", fields{username: "TEST", password: "1234"}, args{username: "TEST", password: "1234"}, true},
{"Non match #1", fields{username: "test", password: "1234"}, args{username: "1234", password: "1234"}, false},
{"Non match #2", fields{username: "1234", password: "test"}, args{username: "1234", password: "1234"}, false},
{"Non match #3", fields{username: "1234", password: "test"}, args{username: "1234", password: "TEST"}, false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
basicAuth := newHashedBasicAuth(tt.fields.username, tt.fields.password)
if got := basicAuth.DoesBasicAuthMatch(tt.args.username, tt.args.password); got != tt.want {
t.Errorf("DoesBasicAuthMatch() = %v, want %v", got, tt.want)
}
})
}
}
func Test_hashedBasicAuth_Enabled(t *testing.T) {
type fields struct {
username string
password string
}
tests := []struct {
name string
fields fields
want bool
}{
{"Both blank", fields{username: "", password: ""}, false},
{"Single blank #1", fields{username: "test", password: ""}, false},
{"Single blank #1", fields{username: "", password: "test"}, false},
{"Both populated", fields{username: "test", password: "test"}, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
basicAuth := newHashedBasicAuth(tt.fields.username, tt.fields.password)
if got := basicAuth.Enabled(); got != tt.want {
t.Errorf("Enabled() = %v, want %v", got, tt.want)
}
})
}
}

View File

@ -2,108 +2,83 @@ package cfg
import (
"fmt"
"github.com/alecthomas/kingpin/v2"
"log"
"os"
"github.com/alecthomas/kong"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
)
const (
socketEnvName = "F2B_COLLECTOR_SOCKET"
fileCollectorPathEnvName = "F2B_COLLECTOR_TEXT_PATH"
addressEnvName = "F2B_WEB_LISTEN_ADDRESS"
basicAuthUserEnvName = "F2B_WEB_BASICAUTH_USER"
basicAuthPassEnvName = "F2B_WEB_BASICAUTH_PASS"
exitOnSocketConnErrorEnvName = "F2B_EXIT_ON_SOCKET_CONN_ERROR"
)
type AppSettings struct {
VersionMode bool
MetricsAddress string
Fail2BanSocketPath string
FileCollectorPath string
BasicAuthProvider *hashedBasicAuth
ExitOnSocketConnError bool
}
func init() {
kingpin.HelpFlag.Short('h')
var cliStruct struct {
VersionMode bool `name:"version" short:"v" help:"Show version info and exit"`
DryRunMode bool `name:"dry-run" help:"Attempt to connect to the fail2ban socket then exit before starting the server"`
ServerAddress string `name:"web.listen-address" env:"F2B_WEB_LISTEN_ADDRESS" help:"Address to use for the metrics server" default:"${default_address}"`
F2bSocketPath string `name:"collector.f2b.socket" env:"F2B_COLLECTOR_SOCKET" help:"Path to the fail2ban server socket" default:"${default_socket}"`
ExitOnSocketError bool `name:"collector.f2b.exit-on-socket-connection-error" env:"F2B_EXIT_ON_SOCKET_CONN_ERROR" help:"When set to true the exporter will immediately exit on a fail2ban socket connection error"`
TextFileExporterPath string `name:"collector.textfile.directory" env:"F2B_COLLECTOR_TEXT_PATH" help:"Directory to read text files with metrics from"`
BasicAuthUser string `name:"web.basic-auth.username" env:"F2B_WEB_BASICAUTH_USER" help:"Username to use to protect endpoints with basic auth"`
BasicAuthPass string `name:"web.basic-auth.password" env:"F2B_WEB_BASICAUTH_PASS" help:"Password to use to protect endpoints with basic auth"`
}
func Parse() *AppSettings {
settings := &AppSettings{}
readParamsFromCli(settings)
settings.validateFlags()
ctx := kong.Parse(
&cliStruct,
kong.Vars{
"default_socket": "/var/run/fail2ban/fail2ban.sock",
"default_address": ":9191",
},
kong.Name("fail2ban_exporter"),
kong.Description("🚀 Export prometheus metrics from a running Fail2Ban instance"),
kong.UsageOnError(),
)
validateFlags(ctx)
settings := &AppSettings{
VersionMode: cliStruct.VersionMode,
DryRunMode: cliStruct.DryRunMode,
MetricsAddress: cliStruct.ServerAddress,
Fail2BanSocketPath: cliStruct.F2bSocketPath,
FileCollectorPath: cliStruct.TextFileExporterPath,
ExitOnSocketConnError: cliStruct.ExitOnSocketError,
AuthProvider: createAuthProvider(),
}
return settings
}
func readParamsFromCli(settings *AppSettings) {
versionMode := kingpin.
Flag("version", "show version info and exit").
Short('v').
Default("false").
Bool()
socketPath := kingpin.
Flag("collector.f2b.socket", "path to the fail2ban server socket").
Default("/var/run/fail2ban/fail2ban.sock").
Envar(socketEnvName).
String()
fileCollectorPath := kingpin.
Flag("collector.textfile.directory", "directory to read text files with metrics from").
Default("").
Envar(fileCollectorPathEnvName).
String()
address := kingpin.
Flag("web.listen-address", "address to use for the metrics server").
Default(":9191").
Envar(addressEnvName).
String()
rawBasicAuthUsername := kingpin.
Flag("web.basic-auth.username", "username to use to protect endpoints with basic auth").
Default("").
Envar(basicAuthUserEnvName).
String()
rawBasicAuthPassword := kingpin.
Flag("web.basic-auth.password", "password to use to protect endpoints with basic auth").
Default("").
Envar(basicAuthPassEnvName).
String()
rawExitOnSocketConnError := kingpin.
Flag("collector.f2b.exit-on-socket-connection-error", "when set to true the exporter will immediately exit on a fail2ban socket connection error").
Default("false").
Envar(exitOnSocketConnErrorEnvName).
Bool()
func createAuthProvider() auth.AuthProvider {
username := cliStruct.BasicAuthUser
password := cliStruct.BasicAuthPass
kingpin.Parse()
settings.VersionMode = *versionMode
settings.MetricsAddress = *address
settings.Fail2BanSocketPath = *socketPath
settings.FileCollectorPath = *fileCollectorPath
settings.setBasicAuthValues(*rawBasicAuthUsername, *rawBasicAuthPassword)
settings.ExitOnSocketConnError = *rawExitOnSocketConnError
if len(username) == 0 && len(password) == 0 {
return auth.NewEmptyAuthProvider()
}
log.Print("basic auth enabled")
return auth.NewBasicAuthProvider(username, password)
}
func (settings *AppSettings) setBasicAuthValues(rawUsername, rawPassword string) {
settings.BasicAuthProvider = newHashedBasicAuth(rawUsername, rawPassword)
}
func (settings *AppSettings) validateFlags() {
func validateFlags(cliCtx *kong.Context) {
var flagsValid = true
if !settings.VersionMode {
if settings.Fail2BanSocketPath == "" {
fmt.Println("error: fail2ban socket path must not be blank")
var messages = []string{}
if !cliStruct.VersionMode {
if cliStruct.F2bSocketPath == "" {
messages = append(messages, "error: fail2ban socket path must not be blank")
flagsValid = false
}
if settings.MetricsAddress == "" {
fmt.Println("error: invalid server address, must not be blank")
if cliStruct.ServerAddress == "" {
messages = append(messages, "error: invalid server address, must not be blank")
flagsValid = false
}
if (len(settings.BasicAuthProvider.username) > 0) != (len(settings.BasicAuthProvider.password) > 0) {
fmt.Println("error: to enable basic auth both the username and the password must be provided")
if (len(cliStruct.BasicAuthUser) > 0) != (len(cliStruct.BasicAuthPass) > 0) {
messages = append(messages, "error: to enable basic auth both the username and the password must be provided")
flagsValid = false
}
}
if !flagsValid {
kingpin.Usage()
cliCtx.PrintUsage(false)
fmt.Println()
for i := 0; i < len(messages); i++ {
fmt.Println(messages[i])
}
os.Exit(1)
}
}

13
cfg/settings.go Normal file
View File

@ -0,0 +1,13 @@
package cfg
import "gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
type AppSettings struct {
VersionMode bool
DryRunMode bool
MetricsAddress string
Fail2BanSocketPath string
FileCollectorPath string
AuthProvider auth.AuthProvider
ExitOnSocketConnError bool
}

View File

@ -1,11 +1,12 @@
package f2b
import (
"log"
"os"
"github.com/prometheus/client_golang/prometheus"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/socket"
"log"
"os"
)
type Collector struct {
@ -18,7 +19,8 @@ type Collector struct {
}
func NewExporter(appSettings *cfg.AppSettings, exporterVersion string) *Collector {
log.Printf("reading metrics from fail2ban socket: %s", appSettings.Fail2BanSocketPath)
log.Printf("reading fail2ban metrics from socket file: %s", appSettings.Fail2BanSocketPath)
printFail2BanServerVersion(appSettings.Fail2BanSocketPath)
return &Collector{
socketPath: appSettings.Fail2BanSocketPath,
exporterVersion: exporterVersion,
@ -58,3 +60,17 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) {
}
c.collectErrorCountMetric(ch)
}
func printFail2BanServerVersion(socketPath string) {
s, err := socket.ConnectToSocket(socketPath)
if err != nil {
log.Printf("error connecting to socket: %v", err)
} else {
version, err := s.GetServerVersion()
if err != nil {
log.Printf("error interacting with socket: %v", err)
} else {
log.Printf("successfully connected to fail2ban socket! fail2ban version: %s", version)
}
}
}

View File

@ -1,11 +1,12 @@
package textfile
import (
"github.com/prometheus/client_golang/prometheus"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
const namespace = "textfile"
@ -19,7 +20,7 @@ var (
)
func (c *Collector) collectFileContents() {
files, err := ioutil.ReadDir(c.folderPath)
files, err := os.ReadDir(c.folderPath)
if err != nil {
log.Printf("error reading directory '%s': %v", c.folderPath, err)
return
@ -36,7 +37,7 @@ func (c *Collector) collectFileContents() {
}
fullPath := filepath.Join(c.folderPath, fileName)
content, err := ioutil.ReadFile(fullPath)
content, err := os.ReadFile(fullPath)
if err != nil {
c.appendErrorForPath(fileName)
log.Printf("error reading contents of file '%s': %v", fileName, err)

View File

@ -2,21 +2,16 @@ package main
import (
"fmt"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/f2b"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
"log"
"net/http"
"os"
"os/signal"
"syscall"
)
const (
metricsPath = "/metrics"
"github.com/prometheus/client_golang/prometheus"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/f2b"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/server"
)
var (
@ -31,66 +26,34 @@ func printAppVersion() {
fmt.Printf(" build date: %s\r\n commit hash: %s\r\n built by: %s\r\n", date, commit, builtBy)
}
func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(
`<html>
<head><title>Fail2Ban Exporter</title></head>
<body>
<h1>Fail2Ban Exporter</h1>
<p><a href="` + metricsPath + `">Metrics</a></p>
</body>
</html>`))
if err != nil {
log.Printf("error handling root url: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
}
func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
promhttp.Handler().ServeHTTP(w, r)
collector.WriteTextFileMetrics(w, r)
}
func main() {
appSettings := cfg.Parse()
if appSettings.VersionMode {
printAppVersion()
} else {
handleGracefulShutdown()
log.Printf("fail2ban exporter version %s", version)
log.Printf("starting server at %s", appSettings.MetricsAddress)
return
}
f2bCollector := f2b.NewExporter(appSettings, version)
prometheus.MustRegister(f2bCollector)
handleGracefulShutdown()
log.Printf("fail2ban exporter version %s", version)
log.Printf("starting server at %s", appSettings.MetricsAddress)
textFileCollector := textfile.NewCollector(appSettings)
prometheus.MustRegister(textFileCollector)
f2bCollector := f2b.NewExporter(appSettings, version)
prometheus.MustRegister(f2bCollector)
http.HandleFunc("/", auth.BasicAuthMiddleware(rootHtmlHandler, appSettings.BasicAuthProvider))
http.HandleFunc(metricsPath, auth.BasicAuthMiddleware(
func(w http.ResponseWriter, r *http.Request) {
metricHandler(w, r, textFileCollector)
},
appSettings.BasicAuthProvider,
))
log.Printf("metrics available at '%s'", metricsPath)
if appSettings.BasicAuthProvider.Enabled() {
log.Printf("basic auth enabled")
}
svrErr := make(chan error)
go func() {
svrErr <- http.ListenAndServe(appSettings.MetricsAddress, nil)
}()
log.Print("ready")
textFileCollector := textfile.NewCollector(appSettings)
prometheus.MustRegister(textFileCollector)
if !appSettings.DryRunMode {
svrErr := server.StartServer(appSettings, textFileCollector)
err := <-svrErr
log.Fatal(err)
} else {
log.Print("running in dry-run mode - exiting")
}
}
func handleGracefulShutdown() {
var signals = make(chan os.Signal)
var signals = make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGTERM)
signal.Notify(signals, syscall.SIGINT)

20
go.mod
View File

@ -1,12 +1,22 @@
module gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
go 1.15
go 1.20
require (
github.com/alecthomas/kingpin/v2 v2.3.2
github.com/alecthomas/kong v0.8.0
github.com/kisielk/og-rek v1.2.0
github.com/nlpodyssey/gopickle v0.2.0
github.com/prometheus/client_golang v1.15.1
github.com/prometheus/common v0.44.0 // indirect
github.com/prometheus/procfs v0.10.1 // indirect
github.com/prometheus/client_golang v1.16.0
)
require (
github.com/beorn7/perks v1.0.1 // indirect
github.com/cespare/xxhash/v2 v2.2.0 // indirect
github.com/golang/protobuf v1.5.3 // indirect
github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
github.com/prometheus/client_model v0.4.0 // indirect
github.com/prometheus/common v0.44.0 // indirect
github.com/prometheus/procfs v0.11.0 // indirect
golang.org/x/sys v0.9.0 // indirect
google.golang.org/protobuf v1.31.0 // indirect
)

543
go.sum
View File

@ -1,555 +1,38 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
cloud.google.com/go/compute/metadata v0.2.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/alecthomas/kingpin/v2 v2.3.1/go.mod h1:oYL5vtsvEHZGHxU7DMp32Dvx+qL+ptGn6lWaot2vCNE=
github.com/alecthomas/kingpin/v2 v2.3.2 h1:H0aULhgmSzN8xQ3nX1uxtdlTHYoPLu5AhHxWrKI6ocU=
github.com/alecthomas/kingpin/v2 v2.3.2/go.mod h1:0gyi0zQnjuFk8xrkNKamJoyUo382HRL7ATRpFZCw6tE=
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golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=

17
server/auth.go Normal file
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@ -0,0 +1,17 @@
package server
import (
"net/http"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
)
func AuthMiddleware(handlerFunc http.HandlerFunc, authProvider auth.AuthProvider) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if authProvider.IsAllowed(r) {
handlerFunc.ServeHTTP(w, r)
} else {
w.WriteHeader(http.StatusUnauthorized)
}
}
}

46
server/auth_test.go Normal file
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@ -0,0 +1,46 @@
package server
import (
"net/http"
"net/http/httptest"
"testing"
)
type testAuthProvider struct {
match bool
}
func (p testAuthProvider) IsAllowed(request *http.Request) bool {
return p.match
}
func newTestRequest() *http.Request {
return httptest.NewRequest(http.MethodGet, "http://example.com", nil)
}
func executeAuthMiddlewareTest(t *testing.T, authMatches bool, expectedCode int, expectedCallCount int) {
callCount := 0
testHandler := func(w http.ResponseWriter, r *http.Request) {
callCount++
}
handler := AuthMiddleware(testHandler, testAuthProvider{match: authMatches})
recorder := httptest.NewRecorder()
request := newTestRequest()
handler.ServeHTTP(recorder, request)
if recorder.Code != expectedCode {
t.Errorf("statusCode = %v, want %v", recorder.Code, expectedCode)
}
if callCount != expectedCallCount {
t.Errorf("callCount = %v, want %v", callCount, expectedCallCount)
}
}
func Test_GIVEN_MatchingBasicAuth_WHEN_MethodCalled_THEN_RequestProcessed(t *testing.T) {
executeAuthMiddlewareTest(t, true, http.StatusOK, 1)
}
func Test_GIVEN_NonMatchingBasicAuth_WHEN_MethodCalled_THEN_RequestRejected(t *testing.T) {
executeAuthMiddlewareTest(t, false, http.StatusUnauthorized, 0)
}

33
server/handler.go Normal file
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@ -0,0 +1,33 @@
package server
import (
"log"
"net/http"
"github.com/prometheus/client_golang/prometheus/promhttp"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
)
const (
metricsPath = "/metrics"
)
func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(
`<html>
<head><title>Fail2Ban Exporter</title></head>
<body>
<h1>Fail2Ban Exporter</h1>
<p><a href="` + metricsPath + `">Metrics</a></p>
</body>
</html>`))
if err != nil {
log.Printf("error handling root url: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
}
func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
promhttp.Handler().ServeHTTP(w, r)
collector.WriteTextFileMetrics(w, r)
}

41
server/server.go Normal file
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@ -0,0 +1,41 @@
package server
import (
"log"
"net/http"
"time"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
)
func StartServer(
appSettings *cfg.AppSettings,
textFileCollector *textfile.Collector,
) chan error {
http.HandleFunc("/", AuthMiddleware(
rootHtmlHandler,
appSettings.AuthProvider,
))
http.HandleFunc(metricsPath, AuthMiddleware(
func(w http.ResponseWriter, r *http.Request) {
metricHandler(w, r, textFileCollector)
},
appSettings.AuthProvider,
))
log.Printf("metrics available at '%s'", metricsPath)
svrErr := make(chan error)
go func() {
httpServer := &http.Server{
Addr: appSettings.MetricsAddress,
ReadHeaderTimeout: 10 * time.Second,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
IdleTimeout: 30 * time.Second,
}
svrErr <- httpServer.ListenAndServe()
}()
log.Print("ready")
return svrErr
}