From 87e60e529939c60ef5b07d70c37426d359b2e8a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Mudr=C3=A1k?= <david@moodle.com>
Date: Mon, 18 Jan 2016 14:26:31 +0100
Subject: [PATCH] MDL-52727 mod_data: Improve output of the form fields values

This issue mostly affects the search form fields. Submitted values for
these fields are typically obtained via optional_param() with
PARAM_NOTAGS specified as the parameter type - see parse_search_field()
methods. Such values themselves are not safe enough to be printed back
directly into the HTML as they might contain malicious code.

While working on the patch, some other places with weak protection were
detected and fixed.

In case of the itemid parameters, the s() seems to be unnecessary but it
was added anyway as an extra protection (just in case the code flow
changes or the parts of the code are re-used elsewhere).
---
 mod/data/field/file/field.class.php     | 4 ++--
 mod/data/field/number/field.class.php   | 2 +-
 mod/data/field/picture/field.class.php  | 4 ++--
 mod/data/field/text/field.class.php     | 2 +-
 mod/data/field/textarea/field.class.php | 4 ++--
 mod/data/field/url/field.class.php      | 4 ++--
 mod/data/lib.php                        | 4 ++--
 7 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/mod/data/field/file/field.class.php b/mod/data/field/file/field.class.php
index 5fd2d215d2d..93dee4739dc 100644
--- a/mod/data/field/file/field.class.php
+++ b/mod/data/field/file/field.class.php
@@ -68,7 +68,7 @@ class data_field_file extends data_field_base {
         $html .= '<fieldset><legend><span class="accesshide">'.$this->field->name.'</span></legend>';
 
         // itemid element
-        $html .= '<input type="hidden" name="field_'.$this->field->id.'_file" value="'.$itemid.'" />';
+        $html .= '<input type="hidden" name="field_'.$this->field->id.'_file" value="'.s($itemid).'" />';
 
         $options = new stdClass();
         $options->maxbytes = $this->field->param3;
@@ -92,7 +92,7 @@ class data_field_file extends data_field_base {
 
     function display_search_field($value = '') {
         return '<label class="accesshide" for="f_' . $this->field->id . '">' . $this->field->name . '</label>' .
-               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.$value.'" />';
+               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.s($value).'" />';
     }
 
     function generate_sql($tablealias, $value) {
diff --git a/mod/data/field/number/field.class.php b/mod/data/field/number/field.class.php
index d04be455d48..4035f501c98 100644
--- a/mod/data/field/number/field.class.php
+++ b/mod/data/field/number/field.class.php
@@ -71,7 +71,7 @@ class data_field_number extends data_field_base {
 
     function display_search_field($value = '') {
         return '<label class="accesshide" for="f_'.$this->field->id.'">' . get_string('fieldname', 'data') . '</label>' .
-               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.$value.'" />';
+               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.s($value).'" />';
     }
 
     function parse_search_field() {
diff --git a/mod/data/field/picture/field.class.php b/mod/data/field/picture/field.class.php
index a459791f790..439c9382584 100644
--- a/mod/data/field/picture/field.class.php
+++ b/mod/data/field/picture/field.class.php
@@ -93,7 +93,7 @@ class data_field_picture extends data_field_base {
         $str .= $output->render($fm);
 
         $str .= '<div class="mdl-left">';
-        $str .= '<input type="hidden" name="field_'.$this->field->id.'_file" value="'.$itemid.'" />';
+        $str .= '<input type="hidden" name="field_'.$this->field->id.'_file" value="'.s($itemid).'" />';
         $str .= '<label for="field_'.$this->field->id.'_alttext">'.get_string('alttext','data') .'</label>&nbsp;<input type="text" name="field_'
                 .$this->field->id.'_alttext" id="field_'.$this->field->id.'_alttext" value="'.s($alttext).'" />';
         $str .= '</div>';
@@ -123,7 +123,7 @@ class data_field_picture extends data_field_base {
 
     function display_search_field($value = '') {
         return '<label class="accesshide" for="f_'.$this->field->id.'">' . get_string('fieldname', 'data') . '</label>' .
-               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.$value.'" />';
+               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.s($value).'" />';
     }
 
     function parse_search_field() {
diff --git a/mod/data/field/text/field.class.php b/mod/data/field/text/field.class.php
index 54cd497e4d9..90aee4c8d1d 100644
--- a/mod/data/field/text/field.class.php
+++ b/mod/data/field/text/field.class.php
@@ -27,7 +27,7 @@ class data_field_text extends data_field_base {
     var $type = 'text';
 
     function display_search_field($value = '') {
-        return '<label class="accesshide" for="f_' . $this->field->id . '">'. $this->field->name.'</label>' . '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.$value.'" />';
+        return '<label class="accesshide" for="f_' . $this->field->id . '">'. $this->field->name.'</label>' . '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.s($value).'" />';
     }
 
     function parse_search_field() {
diff --git a/mod/data/field/textarea/field.class.php b/mod/data/field/textarea/field.class.php
index 51ad6fc8dd5..8be1d198d5d 100644
--- a/mod/data/field/textarea/field.class.php
+++ b/mod/data/field/textarea/field.class.php
@@ -120,7 +120,7 @@ class data_field_textarea extends data_field_base {
             $formats[$fid] = $strformats[$fid];
         }
         $editor->use_editor($field, $options, $fpoptions);
-        $str .= '<input type="hidden" name="'.$field.'_itemid" value="'.$draftitemid.'" />';
+        $str .= '<input type="hidden" name="'.$field.'_itemid" value="'.s($draftitemid).'" />';
         $str .= '<div><textarea id="'.$field.'" name="'.$field.'" rows="'.$this->field->param3.'" cols="'.$this->field->param2.'" spellcheck="true">'.s($text).'</textarea></div>';
         $str .= '<div><label class="accesshide" for="' . $field . '_content1">' . get_string('format') . '</label>';
         $str .= '<select id="' . $field . '_content1" name="'.$field.'_content1">';
@@ -138,7 +138,7 @@ class data_field_textarea extends data_field_base {
 
     function display_search_field($value = '') {
         return '<label class="accesshide" for="f_' . $this->field->id . '">' . $this->field->name . '</label>' .
-               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.$value.'" />';
+               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.s($value).'" />';
     }
 
     function parse_search_field() {
diff --git a/mod/data/field/url/field.class.php b/mod/data/field/url/field.class.php
index eb0c4c57d66..b2e549f87f5 100644
--- a/mod/data/field/url/field.class.php
+++ b/mod/data/field/url/field.class.php
@@ -54,7 +54,7 @@ class data_field_url extends data_field_base {
             $str .= '<table><tr><td align="right">';
             $str .= get_string('url','data').':</td><td>';
             $str .= '<label class="accesshide" for="' . $fieldid . '">'. $this->field->name .'</label>';
-            $str .= '<input type="text" name="field_'.$this->field->id.'_0" id="'.$fieldid.'" value="'.$url.'" size="60" />';
+            $str .= '<input type="text" name="field_'.$this->field->id.'_0" id="'.$fieldid.'" value="'.s($url).'" size="60" />';
             $str .= '<button id="filepicker-button-'.$options->client_id.'" style="display:none">'.$straddlink.'</button></td></tr>';
             $str .= '<tr><td align="right">'.get_string('text','data').':</td><td><input type="text" name="field_'.$this->field->id.'_1" id="field_'.$this->field->id.'_1" value="'.s($text).'" size="60" /></td></tr>';
             $str .= '</table>';
@@ -79,7 +79,7 @@ class data_field_url extends data_field_base {
 
     function display_search_field($value = '') {
         return '<label class="accesshide" for="f_'.$this->field->id.'">' . get_string('fieldname', 'data') . '</label>' .
-               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.$value.'" />';
+               '<input type="text" size="16" id="f_'.$this->field->id.'" name="f_'.$this->field->id.'" value="'.s($value).'" />';
     }
 
     function parse_search_field() {
diff --git a/mod/data/lib.php b/mod/data/lib.php
index cf7b745f56b..12956c89e4a 100644
--- a/mod/data/lib.php
+++ b/mod/data/lib.php
@@ -1741,9 +1741,9 @@ function data_print_preference_form($data, $perpage, $search, $sort='', $order='
     $fn = !empty($search_array[DATA_FIRSTNAME]->data) ? $search_array[DATA_FIRSTNAME]->data : '';
     $ln = !empty($search_array[DATA_LASTNAME]->data) ? $search_array[DATA_LASTNAME]->data : '';
     $patterns[]    = '/##firstname##/';
-    $replacement[] = '<label class="accesshide" for="u_fn">'.get_string('authorfirstname', 'data').'</label><input type="text" size="16" id="u_fn" name="u_fn" value="'.$fn.'" />';
+    $replacement[] = '<label class="accesshide" for="u_fn">'.get_string('authorfirstname', 'data').'</label><input type="text" size="16" id="u_fn" name="u_fn" value="'.s($fn).'" />';
     $patterns[]    = '/##lastname##/';
-    $replacement[] = '<label class="accesshide" for="u_ln">'.get_string('authorlastname', 'data').'</label><input type="text" size="16" id="u_ln" name="u_ln" value="'.$ln.'" />';
+    $replacement[] = '<label class="accesshide" for="u_ln">'.get_string('authorlastname', 'data').'</label><input type="text" size="16" id="u_ln" name="u_ln" value="'.s($ln).'" />';
 
     // actual replacement of the tags
     $newtext = preg_replace($patterns, $replacement, $data->asearchtemplate);