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Add security HTTP headers (#45)

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Vic Demuzere 2021-09-26 16:47:25 +02:00 committed by GitHub
parent 9ad6d468fd
commit 14b5801f37
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2 changed files with 34 additions and 20 deletions
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4
frontend/index.html
View File

@ -41,9 +41,7 @@
document.addEventListener('DOMContentLoaded', () => window.refreshTheme())
// Template variable from Golang process
{{- range $key, $value := .Vars }}
const {{ $key }} = "{{ $value }}"
{{- end }}
const version = "{{ .Version }}"
</script>
</head>
<body>

50
main.go
View File

@ -86,30 +86,46 @@ func assetDelivery(w http.ResponseWriter, r *http.Request) {
}
w.Header().Set("Content-Type", mime.TypeByExtension(ext))
w.Header().Set("X-Content-Type-Options", "nosniff")
w.Write(assetData)
}
var (
// https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
cspHeader = strings.Join([]string{
"default-src 'none'",
"connect-src 'self'",
"font-src 'self'",
"img-src 'self'",
"script-src 'self' 'unsafe-inline'",
"style-src 'self' 'unsafe-inline'",
}, ";")
indexTpl *template.Template
)
func init() {
source, err := assets.ReadFile("frontend/index.html")
if err != nil {
log.WithError(err).Fatal("frontend folder should contain index.html Go template")
}
indexTpl = template.Must(template.New("index.html").Funcs(tplFuncs).Parse(string(source)))
}
func handleIndex(w http.ResponseWriter, r *http.Request) {
indexTpl, err := assets.ReadFile("frontend/index.html")
if err != nil {
http.Error(w, "404 not found", http.StatusNotFound)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Header().Set("Referrer-Policy", "no-referrer")
w.Header().Set("X-Frame-Options", "DENY")
w.Header().Set("X-Xss-Protection", "1; mode=block")
w.Header().Set("Content-Security-Policy", cspHeader)
w.Header().Set("X-Content-Type-Options", "nosniff")
tpl, err := template.New("index.html").Funcs(tplFuncs).Parse(string(indexTpl))
if err != nil {
http.Error(w, errors.Wrap(err, "parsing template").Error(), http.StatusInternalServerError)
return
}
if err = tpl.Execute(w, struct {
Vars map[string]string
if err := indexTpl.Execute(w, struct {
Version string
}{
Vars: map[string]string{
"version": version,
},
Version: version,
}); err != nil {
http.Error(w, errors.Wrap(err, "parsing template").Error(), http.StatusInternalServerError)
http.Error(w, errors.Wrap(err, "executing template").Error(), http.StatusInternalServerError)
return
}
}