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package app
import (
"fmt"
"net/http"
"strings"
"github.com/google/uuid"
"github.com/target/goalert/app/csp"
)
// Manually calculated (by checking Chrome console) hashes for riverui styles and scripts.
var riverStyleHashes = []string{
"'sha256-GNF74DLkXb0fH3ILHgILFjk1ozCF3SNXQ5mQb7WLu/Y='",
"'sha256-7Ri/I+PfhgtpcL7hT4A0VJKI6g3pK0ZvIN09RQV4ZhI='",
"'sha256-58jqDtherY9NOM+ziRgSqQY0078tAZ+qtTBjMgbM9po='",
"'sha256-47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU='",
"'sha256-Nqnn8clbgv+5l0PgxcTOldg8mkMKrFn4TvPL+rYUUGg='",
"'sha256-13vrThxdyT64GcXoTNGVoRRoL0a7EGBmOJ+lemEWyws='",
"'sha256-QZ52fjvWgIOIOPr+gRIJZ7KjzNeTBm50Z+z9dH4N1/8='",
"'sha256-yOU6eaJ75xfag0gVFUvld5ipLRGUy94G17B1uL683EU='",
"'sha256-OpTmykz0m3o5HoX53cykwPhUeU4OECxHQlKXpB0QJPQ='",
"'sha256-SSIM0kI/u45y4gqkri9aH+la6wn2R+xtcBj3Lzh7qQo='",
"'sha256-ZH/+PJIjvP1BctwYxclIuiMu1wItb0aasjpXYXOmU0Y='",
}
var riverScriptHashes = []string{
"'sha256-3wG3yKZPB9onV8sOQ+RPowFfmO7c5KIabwSC+UcggGo='",
}
func withSecureHeaders(enabled, https bool) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
if !enabled {
return next
}
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
h := w.Header()
if https {
h.Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains; preload")
}
nonce := uuid.NewString()
var styleHashes, scriptHashes string
if strings.HasPrefix(req.URL.Path, "/admin/riverui/") {
styleHashes = strings.Join(riverStyleHashes, " ")
scriptHashes = strings.Join(riverScriptHashes, " ")
}
cspVal := fmt.Sprintf("default-src 'self'; "+
"style-src 'self' 'nonce-%s' %s;"+
"font-src 'self' data:; "+
"object-src 'none'; "+
"media-src 'none'; "+
"img-src 'self' data: https://gravatar.com/avatar/; "+
"script-src 'self' 'nonce-%s' %s;", nonce, styleHashes, nonce, scriptHashes)
h.Set("Content-Security-Policy", cspVal)
h.Set("Referrer-Policy", "same-origin")
h.Set("X-Content-Type-Options", "nosniff")
h.Set("X-Frame-Options", "DENY")
h.Set("X-XSS-Protection", "1; mode=block")
next.ServeHTTP(w, req.WithContext(csp.WithNonce(req.Context(), nonce)))
})
}
}
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