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MDL-78505 core: stop mangling existing Mardown in text editors
The problem is that HTML Purifier is not compatible with Markdown, that means we cannot sanitise Markdown texts before editing. Luckily Markdown has to use plain text editor which does not have XSS problems. The only tiny downside is that Markdown cannot be allowed in "trust text" areas any more.
This commit is contained in:
Petr Skoda
parent
a50c2d4746
commit
989636b0de
4 changed files with 296 additions and 2 deletions
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@ -186,7 +186,9 @@ function file_prepare_standard_editor($data, $field, array $options, $context=nu
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$data->{$field.'format'} = editors_get_preferred_format();
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}
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if (!$options['noclean']) {
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$data->{$field} = clean_text($data->{$field}, $data->{$field.'format'});
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if ($data->{$field.'format'} != FORMAT_MARKDOWN) {
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$data->{$field} = clean_text($data->{$field}, $data->{$field . 'format'});
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}
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}
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} else {
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@ -198,7 +200,11 @@ function file_prepare_standard_editor($data, $field, array $options, $context=nu
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$data = trusttext_pre_edit($data, $field, $context);
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} else {
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if (!$options['noclean']) {
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$data->{$field} = clean_text($data->{$field}, $data->{$field.'format'});
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// We do not have a way to sanitise Markdown texts,
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// luckily editors for this format should not have XSS problems.
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if ($data->{$field.'format'} != FORMAT_MARKDOWN) {
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$data->{$field} = clean_text($data->{$field}, $data->{$field.'format'});
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}
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}
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}
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$contextid = $context->id;
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@ -1931,6 +1931,85 @@ EOF;
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sleep(ceil(1 / $leak));
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$this->assertFalse(file_is_draft_areas_limit_reached($user->id));
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}
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/**
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* Test text cleaning when preparing text editor data.
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*
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* @covers ::file_prepare_standard_editor
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*/
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public function test_file_prepare_standard_editor_clean_text() {
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$text = "lala <object>xx</object>";
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$syscontext = \context_system::instance();
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$object = new \stdClass();
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$object->some = $text;
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$object->someformat = FORMAT_PLAIN;
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false]);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true]);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame($text, $result->some);
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$object = new \stdClass();
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$object->some = $text;
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$object->someformat = FORMAT_MARKDOWN;
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false]);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true]);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame($text, $result->some);
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$object = new \stdClass();
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$object->some = $text;
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$object->someformat = FORMAT_MOODLE;
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false]);
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$this->assertSame('lala xx', $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true]);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame('lala xx', $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame($text, $result->some);
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$object = new \stdClass();
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$object->some = $text;
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$object->someformat = FORMAT_HTML;
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false]);
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$this->assertSame('lala xx', $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true]);
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$this->assertSame($text, $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => false, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame('lala xx', $result->some);
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$result = file_prepare_standard_editor(clone($object), 'some',
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['noclean' => true, 'context' => $syscontext], $syscontext, 'core', 'some', 1);
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$this->assertSame($text, $result->some);
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}
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}
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/**
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@ -280,6 +280,204 @@ class weblib_test extends advanced_testcase {
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$this->assertSame('lala xx', clean_text($text, FORMAT_HTML));
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}
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/**
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* Test trusttext enabling.
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*
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* @covers ::trusttext_active
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*/
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public function test_trusttext_active() {
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global $CFG;
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$this->resetAfterTest();
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$this->assertFalse(trusttext_active());
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$CFG->enabletrusttext = '1';
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$this->assertTrue(trusttext_active());
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}
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/**
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* Test trusttext detection.
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*
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* @covers ::trusttext_trusted
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*/
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public function test_trusttext_trusted() {
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global $CFG;
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$this->resetAfterTest();
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$syscontext = context_system::instance();
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$course = $this->getDataGenerator()->create_course();
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$coursecontext = context_course::instance($course->id);
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$user1 = $this->getDataGenerator()->create_user();
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$user2 = $this->getDataGenerator()->create_user();
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$this->getDataGenerator()->enrol_user($user2->id, $course->id, 'editingteacher');
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$this->setAdminUser();
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$CFG->enabletrusttext = '0';
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$this->assertFalse(trusttext_trusted($syscontext));
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$this->assertFalse(trusttext_trusted($coursecontext));
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$CFG->enabletrusttext = '1';
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$this->assertTrue(trusttext_trusted($syscontext));
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$this->assertTrue(trusttext_trusted($coursecontext));
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$this->setUser($user1);
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$CFG->enabletrusttext = '0';
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$this->assertFalse(trusttext_trusted($syscontext));
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$this->assertFalse(trusttext_trusted($coursecontext));
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$CFG->enabletrusttext = '1';
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$this->assertFalse(trusttext_trusted($syscontext));
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$this->assertFalse(trusttext_trusted($coursecontext));
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$this->setUser($user2);
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$CFG->enabletrusttext = '0';
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$this->assertFalse(trusttext_trusted($syscontext));
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$this->assertFalse(trusttext_trusted($coursecontext));
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$CFG->enabletrusttext = '1';
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$this->assertFalse(trusttext_trusted($syscontext));
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$this->assertTrue(trusttext_trusted($coursecontext));
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}
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/**
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* Data provider for trusttext_pre_edit() tests.
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*/
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public function trusttext_pre_edit_provider(): array {
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return [
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[true, 0, 'editingteacher', FORMAT_HTML, 1],
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[true, 0, 'editingteacher', FORMAT_MOODLE, 1],
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[false, 0, 'editingteacher', FORMAT_MARKDOWN, 1],
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[false, 0, 'editingteacher', FORMAT_PLAIN, 1],
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[false, 1, 'editingteacher', FORMAT_HTML, 1],
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[false, 1, 'editingteacher', FORMAT_MOODLE, 1],
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[false, 1, 'editingteacher', FORMAT_MARKDOWN, 1],
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[false, 1, 'editingteacher', FORMAT_PLAIN, 1],
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[true, 0, 'student', FORMAT_HTML, 1],
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[true, 0, 'student', FORMAT_MOODLE, 1],
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[false, 0, 'student', FORMAT_MARKDOWN, 1],
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[false, 0, 'student', FORMAT_PLAIN, 1],
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[true, 1, 'student', FORMAT_HTML, 1],
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[true, 1, 'student', FORMAT_MOODLE, 1],
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[false, 1, 'student', FORMAT_MARKDOWN, 1],
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[false, 1, 'student', FORMAT_PLAIN, 1],
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];
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}
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/**
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* Test text cleaning before editing.
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*
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* @dataProvider trusttext_pre_edit_provider
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* @covers ::trusttext_pre_edit
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*
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* @param bool $expectedsanitised
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* @param int $enabled
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* @param string $rolename
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* @param string $format
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* @param int $trust
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*/
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public function test_trusttext_pre_edit(bool $expectedsanitised, int $enabled, string $rolename,
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string $format, int $trust) {
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global $CFG, $DB;
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$this->resetAfterTest();
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$exploit = "abc<script>alert('xss')</script> < > &";
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$sanitised = purify_html($exploit);
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$course = $this->getDataGenerator()->create_course();
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$context = context_course::instance($course->id);
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$user = $this->getDataGenerator()->create_user();
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$this->getDataGenerator()->enrol_user($user->id, $course->id, $rolename);
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$this->setUser($user);
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$CFG->enabletrusttext = (string)$enabled;
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$object = new stdClass();
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$object->some = $exploit;
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$object->someformat = $format;
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$object->sometrust = (string)$trust;
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$result = trusttext_pre_edit(clone($object), 'some', $context);
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if ($expectedsanitised) {
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$message = "sanitisation is expected for: $enabled, $rolename, $format, $trust";
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$this->assertSame($sanitised, $result->some, $message);
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} else {
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$message = "sanitisation is not expected for: $enabled, $rolename, $format, $trust";
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$this->assertSame($exploit, $result->some, $message);
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}
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}
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/**
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* Test removal of legacy trusttext flag.
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* @covers ::trusttext_strip
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*/
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public function test_trusttext_strip() {
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$this->assertSame('abc', trusttext_strip('abc'));
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$this->assertSame('abc', trusttext_strip('ab#####TRUSTTEXT#####c'));
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}
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/**
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* Test trust option of format_text().
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* @covers ::format_text
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*/
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public function test_format_text_trusted() {
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global $CFG;
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$this->resetAfterTest();
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$text = "lala <object>xx</object>";
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$CFG->enabletrusttext = 0;
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$this->assertSame(s($text),
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format_text($text, FORMAT_PLAIN, ['trusted' => true]));
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$this->assertSame("<p>lala xx</p>\n",
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format_text($text, FORMAT_MARKDOWN, ['trusted' => true]));
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$this->assertSame('<div class="text_to_html">lala xx</div>',
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format_text($text, FORMAT_MOODLE, ['trusted' => true]));
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$this->assertSame('lala xx',
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format_text($text, FORMAT_HTML, ['trusted' => true]));
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$this->assertSame(s($text),
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format_text($text, FORMAT_PLAIN, ['trusted' => false]));
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$this->assertSame("<p>lala xx</p>\n",
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format_text($text, FORMAT_MARKDOWN, ['trusted' => false]));
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$this->assertSame('<div class="text_to_html">lala xx</div>',
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format_text($text, FORMAT_MOODLE, ['trusted' => false]));
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$this->assertSame('lala xx',
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format_text($text, FORMAT_HTML, ['trusted' => false]));
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$CFG->enabletrusttext = 1;
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$this->assertSame(s($text),
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format_text($text, FORMAT_PLAIN, ['trusted' => true]));
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$this->assertSame("<p>lala xx</p>\n",
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format_text($text, FORMAT_MARKDOWN, ['trusted' => true]));
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$this->assertSame('<div class="text_to_html">lala <object>xx</object></div>',
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format_text($text, FORMAT_MOODLE, ['trusted' => true]));
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$this->assertSame('lala <object>xx</object>',
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format_text($text, FORMAT_HTML, ['trusted' => true]));
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$this->assertSame(s($text),
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format_text($text, FORMAT_PLAIN, ['trusted' => false]));
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$this->assertSame("<p>lala xx</p>\n",
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format_text($text, FORMAT_MARKDOWN, ['trusted' => false]));
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$this->assertSame('<div class="text_to_html">lala xx</div>',
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format_text($text, FORMAT_MOODLE, ['trusted' => false]));
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$this->assertSame('lala xx',
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format_text($text, FORMAT_HTML, ['trusted' => false]));
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$this->assertSame("<p>lala <object>xx</object></p>\n",
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format_text($text, FORMAT_MARKDOWN, ['trusted' => true, 'noclean' => true]));
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$this->assertSame("<p>lala <object>xx</object></p>\n",
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format_text($text, FORMAT_MARKDOWN, ['trusted' => false, 'noclean' => true]));
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}
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/**
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* @covers ::qualified_me
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*/
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@ -1275,6 +1275,11 @@ function format_text($text, $format = FORMAT_MOODLE, $options = null, $courseidd
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if (!isset($options['trusted'])) {
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$options['trusted'] = false;
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}
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if ($format == FORMAT_MARKDOWN) {
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// Markdown format cannot be trusted in trusttext areas,
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// because we do not know how to sanitise it before editing.
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$options['trusted'] = false;
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}
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if (!isset($options['noclean'])) {
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if ($options['trusted'] and trusttext_active()) {
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// No cleaning if text trusted and noclean not specified.
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@ -1713,6 +1718,12 @@ function trusttext_pre_edit($object, $field, $context) {
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$trustfield = $field.'trust';
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$formatfield = $field.'format';
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if ($object->$formatfield == FORMAT_MARKDOWN) {
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// We do not have a way to sanitise Markdown texts,
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// luckily editors for this format should not have XSS problems.
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return $object;
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}
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if (!$object->$trustfield or !trusttext_trusted($context)) {
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$object->$field = clean_text($object->$field, $object->$formatfield);
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}
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