Initial commit

5 files changed, 342 insertions, 0 deletions

diff --git a/collector/collector.go b/collector/collector.go
new file mode 100644
index 0000000..2706fcf
--- /dev/null
+++ b/collector/collector.go
@@ -0,0 +1,100 @@
+package collector
+
+import (
+	"log"
+	"net/http"
+	"strconv"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+
+	"bnbl.io/csp_exporter/csp"
+)
+
+type Collector interface {
+	Collect(app string, report *csp.Report)
+	Handler() http.Handler
+}
+
+type collector struct {
+	reportCounter *prometheus.CounterVec
+}
+
+const (
+	labelApp                = "app"
+	labelBlockedURI         = "blocked_uri"
+	labelDisposition        = "disposition"
+	labelDocumentURI        = "document_uri"
+	labelEffectiveDirective = "effective_directive"
+	labelOriginalPolicy     = "original_policy"
+	labelReferrer           = "referrer"
+	labelScriptSample       = "script_sample"
+	labelStatusCode         = "status_code"
+	labelViolatedDirective  = "violated_directive"
+	labelSourceFile         = "source_file"
+	labelLineNumber         = "line_number"
+	labelColumnNumber       = "column_number"
+)
+
+func NewCollector() (Collector, error) {
+	c := &collector{
+		reportCounter: prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: "http",
+			Subsystem: "csp",
+			Name:      "violations_count",
+			Help:      "Count of CSP violation reports.",
+		}, []string{
+			labelApp,
+			labelBlockedURI,
+			labelDisposition,
+			labelDocumentURI,
+			labelEffectiveDirective,
+			labelOriginalPolicy,
+			labelReferrer,
+			labelScriptSample,
+			labelStatusCode,
+			labelViolatedDirective,
+			labelSourceFile,
+			labelLineNumber,
+			labelColumnNumber,
+		}),
+	}
+	if err := prometheus.Register(c.reportCounter); err != nil {
+		log.Fatalf("could not register report counter with prometheus: %v", err)
+	}
+	return c, nil
+}
+
+func (c *collector) Collect(app string, report *csp.Report) {
+	labels := prometheus.Labels{
+		labelApp:                app,
+		labelBlockedURI:         report.BlockedURI,
+		labelDisposition:        report.Disposition,
+		labelDocumentURI:        report.DocumentURI,
+		labelEffectiveDirective: report.EffectiveDirective,
+		labelOriginalPolicy:     report.OriginalPolicy,
+		labelReferrer:           report.Referrer,
+		labelScriptSample:       report.ScriptSample,
+		labelViolatedDirective:  report.ViolatedDirective,
+		labelSourceFile:         report.SourceFile,
+		labelStatusCode:         "",
+		labelLineNumber:         "",
+		labelColumnNumber:       "",
+	}
+
+	if report.StatusCode > 0 {
+		labels[labelStatusCode] = strconv.Itoa(report.StatusCode)
+	}
+	if report.LineNumber > 0 {
+		labels[labelLineNumber] = strconv.Itoa(report.LineNumber)
+	}
+	if report.ColumnNumber > 0 {
+		labels[labelColumnNumber] = strconv.Itoa(report.ColumnNumber)
+	}
+
+	c.reportCounter.With(labels).Inc()
+}
+
+func (c *collector) Handler() http.Handler {
+	return promhttp.Handler()
+}
diff --git a/csp/csp.go b/csp/csp.go
new file mode 100644
index 0000000..15fc1ca
--- /dev/null
+++ b/csp/csp.go
@@ -0,0 +1,33 @@
+package csp
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type Report struct {
+	BlockedURI         string `json:"blocked-uri"`
+	Disposition        string `json:"disposition"`
+	DocumentURI        string `json:"document-uri"`
+	EffectiveDirective string `json:"effective-directive"`
+	OriginalPolicy     string `json:"original-policy"`
+	Referrer           string `json:"referrer"`
+	ScriptSample       string `json:"script-sample"`
+	StatusCode         int    `json:"status-code"`
+	ViolatedDirective  string `json:"violated-directive"`
+	SourceFile         string `json:"source-file"`
+	LineNumber         int    `json:"line-number"`
+	ColumnNumber       int    `json:"column-number"`
+}
+
+func ReadReport(r io.Reader) (*Report, error) {
+	type body struct {
+		Report Report `json:"csp-report"`
+	}
+	d := json.NewDecoder(r)
+	var b body
+	if err := d.Decode(&b); err != nil {
+		return nil, err
+	}
+	return &b.Report, nil
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..70ed472
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module bnbl.io/csp_exporter
+
+go 1.14
+
+require (
+	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/prometheus/client_golang v1.7.1
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..b652420
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,105 @@
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+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+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=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..434b936
--- /dev/null
+++ b/main.go
@@ -0,0 +1,95 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strings"
+
+	"github.com/kelseyhightower/envconfig"
+	"golang.org/x/sync/errgroup"
+
+	"bnbl.io/csp_exporter/collector"
+	"bnbl.io/csp_exporter/csp"
+)
+
+type config struct {
+	CollectorBindAddr string `envconfig:"COLLECTOR_BIND_ADDR" required:"true"`
+	PromBindAddr      string `envconfig:"PROM_BIND_ADDR" default:":9477"`
+}
+
+func main() {
+	var cfg config
+	if err := envconfig.Process("", &cfg); err != nil {
+		log.Fatalf("could not read configuration from environment: %v", err)
+	}
+
+	coll, err := collector.NewCollector()
+	if err != nil {
+		log.Fatalf("could not create collector: %v", err)
+	}
+
+	cspHandler := http.NewServeMux()
+	cspHandler.HandleFunc("/report/csp/", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "POST" {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+		if r.Header.Get("content-type") != "application/csp-report" {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		app := strings.TrimPrefix(r.URL.EscapedPath(), "/report/csp/")
+		if app == "" {
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+
+		report, err := csp.ReadReport(r.Body)
+		if err == io.EOF {
+			w.WriteHeader(http.StatusBadRequest)
+			return
+		} else if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusOK)
+		coll.Collect(app, report)
+	})
+
+	g, ctx := errgroup.WithContext(context.Background())
+
+	// start metrics server
+	g.Go(func() error {
+		h := http.NewServeMux()
+		h.Handle("/metrics", coll.Handler())
+		srv := &http.Server{Addr: cfg.PromBindAddr, Handler: h}
+		go func() {
+			<-ctx.Done()
+			if err := srv.Shutdown(ctx); err != nil {
+				log.Printf("shutdown metrics server: %v", err)
+			}
+		}()
+		return fmt.Errorf("metrics server: %v", srv.ListenAndServe())
+	})
+
+	// start CSP collector server
+	g.Go(func() error {
+		srv := &http.Server{Addr: cfg.CollectorBindAddr, Handler: cspHandler}
+		go func() {
+			<-ctx.Done()
+			if err := srv.Shutdown(ctx); err != nil {
+				log.Printf("shutdown collector server: %v", err)
+			}
+		}()
+		return fmt.Errorf("collector server: %v", srv.ListenAndServe())
+	})
+
+	if err := g.Wait(); err != nil {
+		log.Fatal(err)
+	}
+}