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  7. <title>Security Helper &mdash; CodeIgniter 3.1.11 documentation</title>
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  79. <li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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  81. <li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
  82. <li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
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  88. <li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
  89. <li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
  90. <li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
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  96. <li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
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  105. <li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
  106. <li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
  107. <li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
  108. <li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
  109. <li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
  110. <li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
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  116. <li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
  117. <li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
  118. <li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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  121. <li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
  122. <li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
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  124. <li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
  125. <li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
  126. </ul>
  127. </li>
  128. </ul>
  129. <ul>
  130. <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
  131. <li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
  132. <li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
  133. <li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
  134. <li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
  135. <li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
  136. <li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
  137. <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
  138. <li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
  139. <li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
  140. <li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
  141. <li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
  142. <li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
  143. <li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
  144. <li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
  145. </ul>
  146. </li>
  147. </ul>
  148. <ul class="current">
  149. <li class="toctree-l1 current"><a class="reference internal" href="index.html">Helpers</a><ul class="current">
  150. <li class="toctree-l2"><a class="reference internal" href="array_helper.html">Array Helper</a></li>
  151. <li class="toctree-l2"><a class="reference internal" href="captcha_helper.html">CAPTCHA Helper</a></li>
  152. <li class="toctree-l2"><a class="reference internal" href="cookie_helper.html">Cookie Helper</a></li>
  153. <li class="toctree-l2"><a class="reference internal" href="date_helper.html">Date Helper</a></li>
  154. <li class="toctree-l2"><a class="reference internal" href="directory_helper.html">Directory Helper</a></li>
  155. <li class="toctree-l2"><a class="reference internal" href="download_helper.html">Download Helper</a></li>
  156. <li class="toctree-l2"><a class="reference internal" href="email_helper.html">Email Helper</a></li>
  157. <li class="toctree-l2"><a class="reference internal" href="file_helper.html">File Helper</a></li>
  158. <li class="toctree-l2"><a class="reference internal" href="form_helper.html">Form Helper</a></li>
  159. <li class="toctree-l2"><a class="reference internal" href="html_helper.html">HTML Helper</a></li>
  160. <li class="toctree-l2"><a class="reference internal" href="inflector_helper.html">Inflector Helper</a></li>
  161. <li class="toctree-l2"><a class="reference internal" href="language_helper.html">Language Helper</a></li>
  162. <li class="toctree-l2"><a class="reference internal" href="number_helper.html">Number Helper</a></li>
  163. <li class="toctree-l2"><a class="reference internal" href="path_helper.html">Path Helper</a></li>
  164. <li class="toctree-l2 current"><a class="current reference internal" href="#">Security Helper</a></li>
  165. <li class="toctree-l2"><a class="reference internal" href="smiley_helper.html">Smiley Helper</a></li>
  166. <li class="toctree-l2"><a class="reference internal" href="string_helper.html">String Helper</a></li>
  167. <li class="toctree-l2"><a class="reference internal" href="text_helper.html">Text Helper</a></li>
  168. <li class="toctree-l2"><a class="reference internal" href="typography_helper.html">Typography Helper</a></li>
  169. <li class="toctree-l2"><a class="reference internal" href="url_helper.html">URL Helper</a></li>
  170. <li class="toctree-l2"><a class="reference internal" href="xml_helper.html">XML Helper</a></li>
  171. </ul>
  172. </li>
  173. </ul>
  174. </div>
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  267. <li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
  268. <li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
  269. <li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
  270. <li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
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  274. <li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
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  277. <li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
  278. <li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
  279. <li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
  280. <li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
  281. <li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
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  287. <li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
  288. <li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
  289. <li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
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  291. <li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
  292. <li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
  293. <li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
  294. <li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
  295. <li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
  296. <li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
  297. </ul>
  298. </li>
  299. </ul>
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  301. <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
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  303. <li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
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  305. <li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
  306. <li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
  307. <li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
  308. <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
  309. <li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
  310. <li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
  311. <li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
  312. <li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
  313. <li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
  314. <li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
  315. <li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
  316. </ul>
  317. </li>
  318. </ul>
  319. <ul class="current">
  320. <li class="toctree-l1 current"><a class="reference internal" href="index.html">Helpers</a><ul class="current">
  321. <li class="toctree-l2"><a class="reference internal" href="array_helper.html">Array Helper</a></li>
  322. <li class="toctree-l2"><a class="reference internal" href="captcha_helper.html">CAPTCHA Helper</a></li>
  323. <li class="toctree-l2"><a class="reference internal" href="cookie_helper.html">Cookie Helper</a></li>
  324. <li class="toctree-l2"><a class="reference internal" href="date_helper.html">Date Helper</a></li>
  325. <li class="toctree-l2"><a class="reference internal" href="directory_helper.html">Directory Helper</a></li>
  326. <li class="toctree-l2"><a class="reference internal" href="download_helper.html">Download Helper</a></li>
  327. <li class="toctree-l2"><a class="reference internal" href="email_helper.html">Email Helper</a></li>
  328. <li class="toctree-l2"><a class="reference internal" href="file_helper.html">File Helper</a></li>
  329. <li class="toctree-l2"><a class="reference internal" href="form_helper.html">Form Helper</a></li>
  330. <li class="toctree-l2"><a class="reference internal" href="html_helper.html">HTML Helper</a></li>
  331. <li class="toctree-l2"><a class="reference internal" href="inflector_helper.html">Inflector Helper</a></li>
  332. <li class="toctree-l2"><a class="reference internal" href="language_helper.html">Language Helper</a></li>
  333. <li class="toctree-l2"><a class="reference internal" href="number_helper.html">Number Helper</a></li>
  334. <li class="toctree-l2"><a class="reference internal" href="path_helper.html">Path Helper</a></li>
  335. <li class="toctree-l2 current"><a class="current reference internal" href="#">Security Helper</a></li>
  336. <li class="toctree-l2"><a class="reference internal" href="smiley_helper.html">Smiley Helper</a></li>
  337. <li class="toctree-l2"><a class="reference internal" href="string_helper.html">String Helper</a></li>
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  340. <li class="toctree-l2"><a class="reference internal" href="url_helper.html">URL Helper</a></li>
  341. <li class="toctree-l2"><a class="reference internal" href="xml_helper.html">XML Helper</a></li>
  342. </ul>
  343. </li>
  344. </ul>
  345. </div>
  346. &nbsp;
  347. </nav>
  348. <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
  349. <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
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  351. <a href="../index.html">CodeIgniter</a>
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  354. <div class="rst-content">
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  356. <ul class="wy-breadcrumbs">
  357. <li><a href="../index.html">Docs</a> &raquo;</li>
  358. <li><a href="index.html">Helpers</a> &raquo;</li>
  359. <li>Security Helper</li>
  360. <li class="wy-breadcrumbs-aside">
  361. </li>
  362. <div style="float:right;margin-left:5px;" id="closeMe">
  363. <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
  364. </div>
  365. </ul>
  366. <hr/>
  367. </div>
  368. <div role="main" class="document">
  369. <div class="section" id="security-helper">
  370. <h1>Security Helper<a class="headerlink" href="#security-helper" title="Permalink to this headline">¶</a></h1>
  371. <p>The Security Helper file contains security related functions.</p>
  372. <div class="contents local topic" id="contents">
  373. <ul class="simple">
  374. <li><a class="reference internal" href="#loading-this-helper" id="id1">Loading this Helper</a></li>
  375. <li><a class="reference internal" href="#available-functions" id="id2">Available Functions</a></li>
  376. </ul>
  377. </div>
  378. <div class="custom-index container"></div><div class="section" id="loading-this-helper">
  379. <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>
  380. <p>This helper is loaded using the following code:</p>
  381. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;security&#39;</span><span class="p">);</span>
  382. </pre></div>
  383. </div>
  384. </div>
  385. <div class="section" id="available-functions">
  386. <h2><a class="toc-backref" href="#id2">Available Functions</a><a class="headerlink" href="#available-functions" title="Permalink to this headline">¶</a></h2>
  387. <p>The following functions are available:</p>
  388. <dl class="function">
  389. <dt id="xss_clean">
  390. <code class="descname">xss_clean</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$is_image = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#xss_clean" title="Permalink to this definition">¶</a></dt>
  391. <dd><table class="docutils field-list" frame="void" rules="none">
  392. <col class="field-name" />
  393. <col class="field-body" />
  394. <tbody valign="top">
  395. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
  396. <li><strong>$str</strong> (<em>string</em>) – Input data</li>
  397. <li><strong>$is_image</strong> (<em>bool</em>) – Whether we’re dealing with an image</li>
  398. </ul>
  399. </td>
  400. </tr>
  401. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">XSS-clean string</p>
  402. </td>
  403. </tr>
  404. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
  405. </td>
  406. </tr>
  407. </tbody>
  408. </table>
  409. <p>Provides Cross Site Script Hack filtering.</p>
  410. <p>This function is an alias for <code class="docutils literal"><span class="pre">CI_Input::xss_clean()</span></code>. For more info,
  411. please see the <a class="reference internal" href="../libraries/input.html"><span class="doc">Input Library</span></a> documentation.</p>
  412. </dd></dl>
  413. <dl class="function">
  414. <dt id="sanitize_filename">
  415. <code class="descname">sanitize_filename</code><span class="sig-paren">(</span><em>$filename</em><span class="sig-paren">)</span><a class="headerlink" href="#sanitize_filename" title="Permalink to this definition">¶</a></dt>
  416. <dd><table class="docutils field-list" frame="void" rules="none">
  417. <col class="field-name" />
  418. <col class="field-body" />
  419. <tbody valign="top">
  420. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
  421. <li><strong>$filename</strong> (<em>string</em>) – Filename</li>
  422. </ul>
  423. </td>
  424. </tr>
  425. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Sanitized file name</p>
  426. </td>
  427. </tr>
  428. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
  429. </td>
  430. </tr>
  431. </tbody>
  432. </table>
  433. <p>Provides protection against directory traversal.</p>
  434. <p>This function is an alias for <code class="docutils literal"><span class="pre">CI_Security::sanitize_filename()</span></code>.
  435. For more info, please see the <a class="reference internal" href="../libraries/security.html"><span class="doc">Security Library</span></a>
  436. documentation.</p>
  437. </dd></dl>
  438. <dl class="function">
  439. <dt id="do_hash">
  440. <code class="descname">do_hash</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$type = 'sha1'</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#do_hash" title="Permalink to this definition">¶</a></dt>
  441. <dd><table class="docutils field-list" frame="void" rules="none">
  442. <col class="field-name" />
  443. <col class="field-body" />
  444. <tbody valign="top">
  445. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
  446. <li><strong>$str</strong> (<em>string</em>) – Input</li>
  447. <li><strong>$type</strong> (<em>string</em>) – Algorithm</li>
  448. </ul>
  449. </td>
  450. </tr>
  451. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Hex-formatted hash</p>
  452. </td>
  453. </tr>
  454. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
  455. </td>
  456. </tr>
  457. </tbody>
  458. </table>
  459. <p>Permits you to create one way hashes suitable for encrypting
  460. passwords. Will use SHA1 by default.</p>
  461. <p>See <a class="reference external" href="http://php.net/function.hash_algos">hash_algos()</a>
  462. for a full list of supported algorithms.</p>
  463. <p>Examples:</p>
  464. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$str</span> <span class="o">=</span> <span class="nx">do_hash</span><span class="p">(</span><span class="nv">$str</span><span class="p">);</span> <span class="c1">// SHA1</span>
  465. <span class="nv">$str</span> <span class="o">=</span> <span class="nx">do_hash</span><span class="p">(</span><span class="nv">$str</span><span class="p">,</span> <span class="s1">&#39;md5&#39;</span><span class="p">);</span> <span class="c1">// MD5</span>
  466. </pre></div>
  467. </div>
  468. <div class="admonition note">
  469. <p class="first admonition-title">Note</p>
  470. <p class="last">This function was formerly named <code class="docutils literal"><span class="pre">dohash()</span></code>, which has been
  471. removed in favor of <code class="docutils literal"><span class="pre">do_hash()</span></code>.</p>
  472. </div>
  473. <div class="admonition note">
  474. <p class="first admonition-title">Note</p>
  475. <p class="last">This function is DEPRECATED. Use the native <code class="docutils literal"><span class="pre">hash()</span></code> instead.</p>
  476. </div>
  477. </dd></dl>
  478. <dl class="function">
  479. <dt id="strip_image_tags">
  480. <code class="descname">strip_image_tags</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#strip_image_tags" title="Permalink to this definition">¶</a></dt>
  481. <dd><table class="docutils field-list" frame="void" rules="none">
  482. <col class="field-name" />
  483. <col class="field-body" />
  484. <tbody valign="top">
  485. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
  486. <li><strong>$str</strong> (<em>string</em>) – Input string</li>
  487. </ul>
  488. </td>
  489. </tr>
  490. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">The input string with no image tags</p>
  491. </td>
  492. </tr>
  493. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
  494. </td>
  495. </tr>
  496. </tbody>
  497. </table>
  498. <p>This is a security function that will strip image tags from a string.
  499. It leaves the image URL as plain text.</p>
  500. <p>Example:</p>
  501. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$string</span> <span class="o">=</span> <span class="nx">strip_image_tags</span><span class="p">(</span><span class="nv">$string</span><span class="p">);</span>
  502. </pre></div>
  503. </div>
  504. <p>This function is an alias for <code class="docutils literal"><span class="pre">CI_Security::strip_image_tags()</span></code>. For
  505. more info, please see the <a class="reference internal" href="../libraries/security.html"><span class="doc">Security Library</span></a>
  506. documentation.</p>
  507. </dd></dl>
  508. <dl class="function">
  509. <dt id="encode_php_tags">
  510. <code class="descname">encode_php_tags</code><span class="sig-paren">(</span><em>$str</em><span class="sig-paren">)</span><a class="headerlink" href="#encode_php_tags" title="Permalink to this definition">¶</a></dt>
  511. <dd><table class="docutils field-list" frame="void" rules="none">
  512. <col class="field-name" />
  513. <col class="field-body" />
  514. <tbody valign="top">
  515. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
  516. <li><strong>$str</strong> (<em>string</em>) – Input string</li>
  517. </ul>
  518. </td>
  519. </tr>
  520. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Safely formatted string</p>
  521. </td>
  522. </tr>
  523. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
  524. </td>
  525. </tr>
  526. </tbody>
  527. </table>
  528. <p>This is a security function that converts PHP tags to entities.</p>
  529. <div class="admonition note">
  530. <p class="first admonition-title">Note</p>
  531. <p class="last"><a class="reference internal" href="#xss_clean" title="xss_clean"><code class="xref php php-func docutils literal"><span class="pre">xss_clean()</span></code></a> does this automatically, if you use it.</p>
  532. </div>
  533. <p>Example:</p>
  534. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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>
  535. </pre></div>
  536. </div>
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