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diff --git a/user_guide/libraries/security.html b/user_guide/libraries/security.html deleted file mode 100644 index a50df9118..000000000 --- a/user_guide/libraries/security.html +++ /dev/null @@ -1,740 +0,0 @@ - - -<!DOCTYPE html> -<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> -<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> -<head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1.0"> - - <title>Security Class — CodeIgniter 3.1.5 documentation</title> - - - - - <link rel="shortcut icon" href="../_static/ci-icon.ico"/> - - - - <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> - - - - - - - - - - <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> - - - - <link rel="top" title="CodeIgniter 3.1.5 documentation" href="../index.html"/> - <link 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src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> - </div> - </ul> - <hr/> -</div> - <div role="main" class="document"> - - <div class="section" id="security-class"> -<h1>Security Class<a class="headerlink" href="#security-class" title="Permalink to this headline">¶</a></h1> -<p>The Security Class contains methods that help you create a secure -application, processing input data for security.</p> -<div class="contents local topic" id="contents"> -<ul class="simple"> -<li><a class="reference internal" href="#xss-filtering" id="id1">XSS Filtering</a></li> -<li><a class="reference internal" href="#cross-site-request-forgery-csrf" id="id2">Cross-site request forgery (CSRF)</a></li> -<li><a class="reference internal" href="#class-reference" id="id3">Class Reference</a></li> -</ul> -</div> -<div class="custom-index container"></div><div class="section" id="xss-filtering"> -<h2><a class="toc-backref" href="#id1">XSS Filtering</a><a class="headerlink" href="#xss-filtering" title="Permalink to this headline">¶</a></h2> -<p>CodeIgniter comes with a Cross Site Scripting prevention filter, which -looks for commonly used techniques to trigger JavaScript or other types -of code that attempt to hijack cookies or do other malicious things. -If anything disallowed is encountered it is rendered safe by converting -the data to character entities.</p> -<p>To filter data through the XSS filter use the <tt class="docutils literal"><span class="pre">xss_clean()</span></tt> method:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$data</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">security</span><span class="o">-></span><span class="na">xss_clean</span><span class="p">(</span><span class="nv">$data</span><span class="p">);</span> -</pre></div> -</div> -<p>An optional second parameter, <em>is_image</em>, allows this function to be used -to test images for potential XSS attacks, useful for file upload -security. When this second parameter is set to TRUE, instead of -returning an altered string, the function returns TRUE if the image is -safe, and FALSE if it contained potentially malicious information that a -browser may attempt to execute.</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">security</span><span class="o">-></span><span class="na">xss_clean</span><span class="p">(</span><span class="nv">$file</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">)</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span> -<span class="p">{</span> - <span class="c1">// file failed the XSS test</span> -<span class="p">}</span> -</pre></div> -</div> -<div class="admonition important"> -<p class="first admonition-title">Important</p> -<p class="last">If you want to filter HTML attribute values, use -<a class="reference internal" href="../general/common_functions.html#html_escape" title="html_escape"><tt class="xref php php-func docutils literal"><span class="pre">html_escape()</span></tt></a> instead!</p> -</div> -</div> -<div class="section" id="cross-site-request-forgery-csrf"> -<h2><a class="toc-backref" href="#id2">Cross-site request forgery (CSRF)</a><a class="headerlink" href="#cross-site-request-forgery-csrf" title="Permalink to this headline">¶</a></h2> -<p>You can enable CSRF protection by altering your <strong>application/config/config.php</strong> -file in the following way:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'csrf_protection'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> -</pre></div> -</div> -<p>If you use the <a class="reference internal" href="../helpers/form_helper.html"><em>form helper</em></a>, then -<tt class="xref py py-func docutils literal"><span class="pre">form_open()</span></tt> will automatically insert a hidden csrf field in -your forms. If not, then you can use <tt class="docutils literal"><span class="pre">get_csrf_token_name()</span></tt> -and <tt class="docutils literal"><span class="pre">get_csrf_hash()</span></tt></p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$csrf</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> - <span class="s1">'name'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">security</span><span class="o">-></span><span class="na">get_csrf_token_name</span><span class="p">(),</span> - <span class="s1">'hash'</span> <span class="o">=></span> <span class="nv">$this</span><span class="o">-></span><span class="na">security</span><span class="o">-></span><span class="na">get_csrf_hash</span><span class="p">()</span> -<span class="p">);</span> - -<span class="o">...</span> - -<span class="o"><</span><span class="nx">input</span> <span class="nx">type</span><span class="o">=</span><span class="s2">"hidden"</span> <span class="nx">name</span><span class="o">=</span><span class="s2">"<?=</span><span class="si">$csrf['name']</span><span class="s2">;?>"</span> <span class="nx">value</span><span class="o">=</span><span class="s2">"<?=</span><span class="si">$csrf['hash']</span><span class="s2">;?>"</span> <span class="o">/></span> -</pre></div> -</div> -<p>Tokens may be either regenerated on every submission (default) or -kept the same throughout the life of the CSRF cookie. The default -regeneration of tokens provides stricter security, but may result -in usability concerns as other tokens become invalid (back/forward -navigation, multiple tabs/windows, asynchronous actions, etc). You -may alter this behavior by editing the following config parameter</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'csrf_regenerate'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> -</pre></div> -</div> -<p>Select URIs can be whitelisted from csrf protection (for example API -endpoints expecting externally POSTed content). You can add these URIs -by editing the ‘csrf_exclude_uris’ config parameter:</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'csrf_exclude_uris'</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'api/person/add'</span><span class="p">);</span> -</pre></div> -</div> -<p>Regular expressions are also supported (case-insensitive):</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">'csrf_exclude_uris'</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> - <span class="s1">'api/record/[0-9]+'</span><span class="p">,</span> - <span class="s1">'api/title/[a-z]+'</span> -<span class="p">);</span> -</pre></div> -</div> -</div> -<div class="section" id="class-reference"> -<h2><a class="toc-backref" href="#id3">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2> -<dl class="class"> -<dt id="CI_Security"> -<em class="property">class </em><tt class="descname">CI_Security</tt><a class="headerlink" href="#CI_Security" title="Permalink to this definition">¶</a></dt> -<dd><dl class="method"> -<dt id="CI_Security::xss_clean"> -<tt class="descname">xss_clean</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$is_image = FALSE</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Security::xss_clean" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$str</strong> (<em>mixed</em>) – Input string or an array of strings</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">XSS-clean data</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p> -</td> -</tr> -</tbody> -</table> -<p>Tries to remove XSS exploits from the input data and returns the cleaned string. -If the optional second parameter is set to true, it will return boolean TRUE if -the image is safe to use and FALSE if malicious data was detected in it.</p> -<div class="admonition important"> -<p class="first admonition-title">Important</p> -<p class="last">This method is not suitable for filtering HTML attribute vales! -Use <a class="reference internal" href="../general/common_functions.html#html_escape" title="html_escape"><tt class="xref php php-func docutils literal"><span class="pre">html_escape()</span></tt></a> for that instead.</p> -</div> -</dd></dl> - -<dl class="method"> -<dt id="CI_Security::sanitize_filename"> -<tt class="descname">sanitize_filename</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$relative_path = FALSE</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Security::sanitize_filename" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$str</strong> (<em>string</em>) – File name/path</li> -<li><strong>$relative_path</strong> (<em>bool</em>) – Whether to preserve any directories in the file path</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Sanitized file name/path</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> -</td> -</tr> -</tbody> -</table> -<p>Tries to sanitize filenames in order to prevent directory traversal attempts -and other security threats, which is particularly useful for files that were supplied via user input.</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$filename</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">security</span><span class="o">-></span><span class="na">sanitize_filename</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">post</span><span class="p">(</span><span class="s1">'filename'</span><span class="p">));</span> -</pre></div> -</div> -<p>If it is acceptable for the user input to include relative paths, e.g. -<em>file/in/some/approved/folder.txt</em>, you can set the second optional parameter, <tt class="docutils literal"><span class="pre">$relative_path</span></tt> to TRUE.</p> -<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$filename</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">security</span><span class="o">-></span><span class="na">sanitize_filename</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">input</span><span class="o">-></span><span class="na">post</span><span class="p">(</span><span class="s1">'filename'</span><span class="p">),</span> <span class="k">TRUE</span><span class="p">);</span> -</pre></div> -</div> -</dd></dl> - -<dl class="method"> -<dt id="CI_Security::get_csrf_token_name"> -<tt class="descname">get_csrf_token_name</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Security::get_csrf_token_name" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">CSRF token name</td> -</tr> -<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td> -</tr> -</tbody> -</table> -<p>Returns the CSRF token name (the <tt class="docutils literal"><span class="pre">$config['csrf_token_name']</span></tt> value).</p> -</dd></dl> - -<dl class="method"> -<dt id="CI_Security::get_csrf_hash"> -<tt class="descname">get_csrf_hash</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Security::get_csrf_hash" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">CSRF hash</td> -</tr> -<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td> -</tr> -</tbody> -</table> -<p>Returns the CSRF hash value. Useful in combination with <tt class="docutils literal"><span class="pre">get_csrf_token_name()</span></tt> -for manually building forms or sending valid AJAX POST requests.</p> -</dd></dl> - -<dl class="method"> -<dt id="CI_Security::entity_decode"> -<tt class="descname">entity_decode</tt><big>(</big><em>$str</em><span class="optional">[</span>, <em>$charset = NULL</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Security::entity_decode" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$str</strong> (<em>string</em>) – Input string</li> -<li><strong>$charset</strong> (<em>string</em>) – Character set of the input string</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Entity-decoded string</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> -</td> -</tr> -</tbody> -</table> -<p>This method acts a lot like PHP’s own native <tt class="docutils literal"><span class="pre">html_entity_decode()</span></tt> function in ENT_COMPAT mode, only -it tries to detect HTML entities that don’t end in a semicolon because some browsers allow that.</p> -<p>If the <tt class="docutils literal"><span class="pre">$charset</span></tt> parameter is left empty, then your configured <tt class="docutils literal"><span class="pre">$config['charset']</span></tt> value will be used.</p> -</dd></dl> - -<dl class="method"> -<dt id="CI_Security::get_random_bytes"> -<tt class="descname">get_random_bytes</tt><big>(</big><em>$length</em><big>)</big><a class="headerlink" href="#CI_Security::get_random_bytes" title="Permalink to this definition">¶</a></dt> -<dd><table class="docutils field-list" frame="void" rules="none"> -<col class="field-name" /> -<col class="field-body" /> -<tbody valign="top"> -<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> -<li><strong>$length</strong> (<em>int</em>) – Output length</li> -</ul> -</td> -</tr> -<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">A binary stream of random bytes or FALSE on failure</p> -</td> -</tr> -<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> -</td> -</tr> -</tbody> -</table> -<p>A convenience method for getting proper random bytes via <tt class="docutils literal"><span class="pre">mcrypt_create_iv()</span></tt>, -<tt class="docutils literal"><span class="pre">/dev/urandom</span></tt> or <tt class="docutils literal"><span class="pre">openssl_random_pseudo_bytes()</span></tt> (in that order), if one -of them is available.</p> -<p>Used for generating CSRF and XSS tokens.</p> -<div class="admonition note"> -<p class="first admonition-title">Note</p> -<p class="last">The output is NOT guaranteed to be cryptographically secure, -just the best attempt at that.</p> -</div> -</dd></dl> - -</dd></dl> - -</div> -</div> - - - </div> - <footer> - - <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> - - <a href="sessions.html" class="btn btn-neutral float-right" title="Session Library">Next <span class="fa fa-arrow-circle-right"></span></a> - - - <a href="parser.html" class="btn btn-neutral" title="Template Parser Class"><span class="fa fa-arrow-circle-left"></span> Previous</a> - - </div> - - - <hr/> - - <div role="contentinfo"> - <p> - © Copyright 2014 - 2017, British Columbia Institute of Technology. - Last updated on Jun 19, 2017. - </p> - </div> - - Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. - -</footer> - </div> - </div> - - </section> - - </div> - - - - - - <script type="text/javascript"> - var DOCUMENTATION_OPTIONS = { - URL_ROOT:'../', - VERSION:'3.1.5', - COLLAPSE_INDEX:false, - FILE_SUFFIX:'.html', - HAS_SOURCE: false - }; - </script> - <script type="text/javascript" src="../_static/jquery.js"></script> - <script type="text/javascript" src="../_static/underscore.js"></script> - <script type="text/javascript" src="../_static/doctools.js"></script> - - - - - - <script type="text/javascript" src="../_static/js/theme.js"></script> - - - - - <script type="text/javascript"> - jQuery(function () { - SphinxRtdTheme.StickyNav.enable(); - }); - </script> - - -</body> -</html>
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