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href="url_helper.html">URL Helper</a></li> <li class="toctree-l2"><a class="reference internal" href="xml_helper.html">XML Helper</a></li> </ul> </li> </ul> </div> </nav> <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> <i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="../index.html">CodeIgniter</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="breadcrumbs navigation"> <ul class="wy-breadcrumbs"> <li><a href="../index.html">Docs</a> »</li> <li><a href="index.html">Helpers</a> »</li> <li>Security Helper</li> <li class="wy-breadcrumbs-aside"> </li> <div style="float:right;margin-left:5px;" id="closeMe"> <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" /> </div> </ul> <hr/> </div> <div role="main" class="document"> <div class="section" id="security-helper"> <h1>Security Helper<a class="headerlink" href="#security-helper" title="Permalink to this headline">¶</a></h1> <p>The Security Helper file contains security related functions.</p> <div class="contents local topic" id="contents"> <ul class="simple"> <li><a class="reference internal" href="#loading-this-helper" id="id1">Loading this Helper</a></li> <li><a class="reference internal" href="#available-functions" id="id2">Available Functions</a></li> </ul> </div> <div class="custom-index container"></div><div class="section" id="loading-this-helper"> <h2><a class="toc-backref" href="#id1">Loading this Helper</a><a class="headerlink" href="#loading-this-helper" title="Permalink to this headline">¶</a></h2> <p>This helper is loaded using the following code:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">helper</span><span class="p">(</span><span class="s1">'security'</span><span class="p">);</span> </pre></div> </div> </div> <div class="section" id="available-functions"> <h2><a class="toc-backref" href="#id2">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline">¶</a></h2> <p>The following functions are available:</p> <dl class="function"> <dt id="xss_clean"> <code class="descname">xss_clean</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$is_image = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#xss_clean" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$str</strong> (<em>string</em>) – Input data</li> <li><strong>$is_image</strong> (<em>bool</em>) – Whether we’re dealing with an image</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">XSS-clean string</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Provides Cross Site Script Hack filtering.</p> <p>This function is an alias for <code class="docutils literal"><span class="pre">CI_Input::xss_clean()</span></code>. For more info, please see the <a class="reference internal" href="../libraries/input.html"><span class="doc">Input Library</span></a> documentation.</p> </dd></dl> <dl class="function"> <dt id="sanitize_filename"> <code class="descname">sanitize_filename</code><span class="sig-paren">(</span><em>$filename</em><span class="sig-paren">)</span><a class="headerlink" href="#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>$filename</strong> (<em>string</em>) – Filename</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Sanitized file name</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Provides protection against directory traversal.</p> <p>This function is an alias for <code class="docutils literal"><span class="pre">CI_Security::sanitize_filename()</span></code>. For more info, please see the <a class="reference internal" href="../libraries/security.html"><span class="doc">Security Library</span></a> documentation.</p> </dd></dl> <dl class="function"> <dt id="do_hash"> <code class="descname">do_hash</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$type = 'sha1'</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#do_hash" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$str</strong> (<em>string</em>) – Input</li> <li><strong>$type</strong> (<em>string</em>) – Algorithm</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Hex-formatted hash</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>Permits you to create one way hashes suitable for encrypting passwords. Will use SHA1 by default.</p> <p>See <a class="reference external" href="http://php.net/function.hash_algos">hash_algos()</a> for a full list of supported algorithms.</p> <p>Examples:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="nx">do_hash</span><span class="p">(</span><span class="nv">$str</span><span class="p">);</span> <span class="c1">// SHA1</span> <span class="nv">$str</span> <span class="o">=</span> <span class="nx">do_hash</span><span class="p">(</span><span class="nv">$str</span><span class="p">,</span> <span class="s1">'md5'</span><span class="p">);</span> <span class="c1">// MD5</span> </pre></div> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">This function was formerly named <code class="docutils literal"><span class="pre">dohash()</span></code>, which has been removed in favor of <code class="docutils literal"><span class="pre">do_hash()</span></code>.</p> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">This function is DEPRECATED. Use the native <code class="docutils literal"><span class="pre">hash()</span></code> instead.</p> </div> </dd></dl> <dl class="function"> <dt id="strip_image_tags"> <code class="descname">strip_image_tags</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#strip_image_tags" 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>$str</strong> (<em>string</em>) – Input string</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">The input string with no image tags</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>This is a security function that will strip image tags from a string. It leaves the image URL as plain text.</p> <p>Example:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="nx">strip_image_tags</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span> </pre></div> </div> <p>This function is an alias for <code class="docutils literal"><span class="pre">CI_Security::strip_image_tags()</span></code>. For more info, please see the <a class="reference internal" href="../libraries/security.html"><span class="doc">Security Library</span></a> documentation.</p> </dd></dl> <dl class="function"> <dt id="encode_php_tags"> <code class="descname">encode_php_tags</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#encode_php_tags" 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>$str</strong> (<em>string</em>) – Input string</li> </ul> </td> </tr> <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Safely formatted string</p> </td> </tr> <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p> </td> </tr> </tbody> </table> <p>This is a security function that converts PHP tags to entities.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last"><a class="reference internal" href="#xss_clean" title="xss_clean"><code class="xref php php-func docutils literal"><span class="pre">xss_clean()</span></code></a> does this automatically, if you use it.</p> </div> <p>Example:</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="nx">encode_php_tags</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span> </pre></div> </div> </dd></dl> </div> </div> </div> <footer> <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> <a href="smiley_helper.html" class="btn btn-neutral float-right" title="Smiley Helper">Next <span class="fa fa-arrow-circle-right"></span></a> <a href="path_helper.html" class="btn btn-neutral" title="Path Helper"><span class="fa fa-arrow-circle-left"></span> Previous</a> </div> <hr/> <div role="contentinfo"> <p> © Copyright 2014 - 2019, British Columbia Institute of Technology. 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