paulgoughbooks_old
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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014-2019 British Columbia Institute of Technology * Copyright (c) 2019-2020 CodeIgniter Foundation * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @package CodeIgniter * @author CodeIgniter Dev Team * @copyright 2019-2020 CodeIgniter Foundation * @license https://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 4.0.0 * @filesource */ namespace CodeIgniter\HTTP; /** * Class ContentSecurityPolicy * * Provides tools for working with the Content-Security-Policy header * to help defeat XSS attacks. * * @see http://www.w3.org/TR/CSP/ * @see http://www.html5rocks.com/en/tutorials/security/content-security-policy/ * @see http://content-security-policy.com/ * @see https://www.owasp.org/index.php/Content_Security_Policy * @package CodeIgniter\HTTP */ class ContentSecurityPolicy { /** * Used for security enforcement * * @var array|string */ protected $baseURI = []; /** * Used for security enforcement * * @var array|string */ protected $childSrc = []; /** * Used for security enforcement * * @var array */ protected $connectSrc = []; /** * Used for security enforcement * * @var array|string */ protected $defaultSrc = []; /** * Used for security enforcement * * @var array|string */ protected $fontSrc = []; /** * Used for security enforcement * * @var array|string */ protected $formAction = []; /** * Used for security enforcement * * @var array|string */ protected $frameAncestors = []; /** * Used for security enforcement * * @var array|string */ protected $imageSrc = []; /** * Used for security enforcement * * @var array|string */ protected $mediaSrc = []; /** * Used for security enforcement * * @var array|string */ protected $objectSrc = []; /** * Used for security enforcement * * @var array|string */ protected $pluginTypes = []; /** * Used for security enforcement * * @var string */ protected $reportURI; /** * Used for security enforcement * * @var array|string */ protected $sandbox = []; /** * Used for security enforcement * * @var array|string */ protected $scriptSrc = []; /** * Used for security enforcement * * @var array|string */ protected $styleSrc = []; /** * Used for security enforcement * * @var array|string */ protected $manifestSrc = []; /** * Used for security enforcement * * @var boolean */ protected $upgradeInsecureRequests = false; /** * Used for security enforcement * * @var boolean */ protected $reportOnly = false; /** * Used for security enforcement * * @var array */ protected $validSources = [ 'self', 'none', 'unsafe-inline', 'unsafe-eval', ]; /** * Used for security enforcement * * @var array */ protected $nonces = []; /** * An array of header info since we have * to build ourself before passing to Response. * * @var array */ protected $tempHeaders = []; /** * An array of header info to build * that should only be reported. * * @var array */ protected $reportOnlyHeaders = []; //-------------------------------------------------------------------- /** * ContentSecurityPolicy constructor. * * Stores our default values from the Config file. * * @param \Config\ContentSecurityPolicy $config */ public function __construct(\Config\ContentSecurityPolicy $config) { foreach ($config as $setting => $value) { if (isset($this->{$setting})) { $this->{$setting} = $value; } } } //-------------------------------------------------------------------- /** * Compiles and sets the appropriate headers in the request. * * Should be called just prior to sending the response to the user agent. * * @param ResponseInterface $response */ public function finalize(ResponseInterface &$response) { $this->generateNonces($response); $this->buildHeaders($response); } //-------------------------------------------------------------------- /** * If TRUE, nothing will be restricted. Instead all violations will * be reported to the reportURI for monitoring. This is useful when * you are just starting to implement the policy, and will help * determine what errors need to be addressed before you turn on * all filtering. * * @param boolean|true $value * * @return $this */ public function reportOnly(bool $value = true) { $this->reportOnly = $value; return $this; } //-------------------------------------------------------------------- /** * Adds a new base_uri value. Can be either a URI class or a simple string. * * base_uri restricts the URLs that can appear in a page’s <base> element. * * @see http://www.w3.org/TR/CSP/#directive-base-uri * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addBaseURI($uri, bool $explicitReporting = null) { $this->addOption($uri, 'baseURI', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for a form's action. Can be either * a URI class or a simple string. * * child-src lists the URLs for workers and embedded frame contents. * For example: child-src https://youtube.com would enable embedding * videos from YouTube but not from other origins. * * @see http://www.w3.org/TR/CSP/#directive-child-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addChildSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'childSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for a form's action. Can be either * a URI class or a simple string. * * connect-src limits the origins to which you can connect * (via XHR, WebSockets, and EventSource). * * @see http://www.w3.org/TR/CSP/#directive-connect-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addConnectSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'connectSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for a form's action. Can be either * a URI class or a simple string. * * default_src is the URI that is used for many of the settings when * no other source has been set. * * @see http://www.w3.org/TR/CSP/#directive-default-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function setDefaultSrc($uri, bool $explicitReporting = null) { $this->defaultSrc = [(string) $uri => $explicitReporting ?? $this->reportOnly]; return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for a form's action. Can be either * a URI class or a simple string. * * font-src specifies the origins that can serve web fonts. * * @see http://www.w3.org/TR/CSP/#directive-font-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addFontSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'fontSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for a form's action. Can be either * a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-form-action * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addFormAction($uri, bool $explicitReporting = null) { $this->addOption($uri, 'formAction', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new resource that should allow embedding the resource using * <frame>, <iframe>, <object>, <embed>, or <applet> * * @see http://www.w3.org/TR/CSP/#directive-frame-ancestors * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addFrameAncestor($uri, bool $explicitReporting = null) { $this->addOption($uri, 'frameAncestors', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for valid image sources. Can be either * a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-img-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addImageSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'imageSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for valid video and audio. Can be either * a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-media-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addMediaSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'mediaSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for manifest sources. Can be either * a URI class or simple string. * * @see https://www.w3.org/TR/CSP/#directive-manifest-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addManifestSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'manifestSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for Flash and other plugin sources. Can be either * a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-object-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addObjectSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'objectSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Limits the types of plugins that can be used. Can be either * a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-plugin-types * * @param string|array $mime One or more plugin mime types, separate by spaces * @param boolean|null $explicitReporting * * @return $this */ public function addPluginType($mime, bool $explicitReporting = null) { $this->addOption($mime, 'pluginTypes', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Specifies a URL where a browser will send reports when a content * security policy is violated. Can be either a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-report-uri * * @param string $uri * * @return $this */ public function setReportURI(string $uri) { $this->reportURI = $uri; return $this; } //-------------------------------------------------------------------- /** * specifies an HTML sandbox policy that the user agent applies to * the protected resource. * * @see http://www.w3.org/TR/CSP/#directive-sandbox * * @param string|array $flags An array of sandbox flags that can be added to the directive. * @param boolean|null $explicitReporting * * @return $this */ public function addSandbox($flags, bool $explicitReporting = null) { $this->addOption($flags, 'sandbox', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for javascript file sources. Can be either * a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-connect-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addScriptSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'scriptSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Adds a new valid endpoint for CSS file sources. Can be either * a URI class or a simple string. * * @see http://www.w3.org/TR/CSP/#directive-connect-src * * @param string|array $uri * @param boolean|null $explicitReporting * * @return $this */ public function addStyleSrc($uri, bool $explicitReporting = null) { $this->addOption($uri, 'styleSrc', $explicitReporting ?? $this->reportOnly); return $this; } //-------------------------------------------------------------------- /** * Sets whether the user agents should rewrite URL schemes, changing * HTTP to HTTPS. * * @param boolean $value * * @return $this */ public function upgradeInsecureRequests(bool $value = true) { $this->upgradeInsecureRequests = $value; return $this; } //-------------------------------------------------------------------- // Utility //-------------------------------------------------------------------- /** * DRY method to add an string or array to a class property. * * @param string|array $options * @param string $target * @param boolean|null $explicitReporting */ protected function addOption($options, string $target, bool $explicitReporting = null) { // Ensure we have an array to work with... if (is_string($this->{$target})) { $this->{$target} = [$this->{$target}]; } if (is_array($options)) { foreach ($options as $opt) { $this->{$target}[$opt] = $explicitReporting ?? $this->reportOnly; } } else { $this->{$target}[$options] = $explicitReporting ?? $this->reportOnly; } } //-------------------------------------------------------------------- /** * Scans the body of the request message and replaces any nonce * placeholders with actual nonces, that we'll then add to our * headers. * * @param ResponseInterface|\CodeIgniter\HTTP\Response $response */ protected function generateNonces(ResponseInterface &$response) { $body = $response->getBody(); if (empty($body)) { return; } if (! is_array($this->styleSrc)) { $this->styleSrc = [$this->styleSrc]; } if (! is_array($this->scriptSrc)) { $this->scriptSrc = [$this->scriptSrc]; } // Replace style placeholders with nonces $body = preg_replace_callback( '/{csp-style-nonce}/', function ($matches) { $nonce = bin2hex(random_bytes(12)); $this->styleSrc[] = 'nonce-' . $nonce; return "nonce=\"{$nonce}\""; }, $body ); // Replace script placeholders with nonces $body = preg_replace_callback( '/{csp-script-nonce}/', function ($matches) { $nonce = bin2hex(random_bytes(12)); $this->scriptSrc[] = 'nonce-' . $nonce; return "nonce=\"{$nonce}\""; }, $body ); $response->setBody($body); } //-------------------------------------------------------------------- /** * Based on the current state of the elements, will add the appropriate * Content-Security-Policy and Content-Security-Policy-Report-Only headers * with their values to the response object. * * @param ResponseInterface|\CodeIgniter\HTTP\Response $response */ protected function buildHeaders(ResponseInterface &$response) { // Ensure both headers are available and arrays... $response->setHeader('Content-Security-Policy', []); $response->setHeader('Content-Security-Policy-Report-Only', []); $directives = [ 'base-uri' => 'baseURI', 'child-src' => 'childSrc', 'connect-src' => 'connectSrc', 'default-src' => 'defaultSrc', 'font-src' => 'fontSrc', 'form-action' => 'formAction', 'frame-ancestors' => 'frameAncestors', 'img-src' => 'imageSrc', 'media-src' => 'mediaSrc', 'object-src' => 'objectSrc', 'plugin-types' => 'pluginTypes', 'script-src' => 'scriptSrc', 'style-src' => 'styleSrc', 'manifest-src' => 'manifestSrc', 'sandbox' => 'sandbox', 'report-uri' => 'reportURI', ]; // inject default base & default URIs if needed if (empty($this->baseURI)) { $this->baseURI = 'self'; } if (empty($this->defaultSrc)) { $this->defaultSrc = 'self'; } foreach ($directives as $name => $property) { // base_uri if (! empty($this->{$property})) { $this->addToHeader($name, $this->{$property}); } } // Compile our own header strings here since if we just // append it to the response, it will be joined with // commas, not semi-colons as we need. if (! empty($this->tempHeaders)) { $header = ''; foreach ($this->tempHeaders as $name => $value) { $header .= " {$name} {$value};"; } // add token only if needed if ($this->upgradeInsecureRequests) { $header .= ' upgrade-insecure-requests;'; } $response->appendHeader('Content-Security-Policy', $header); } if (! empty($this->reportOnlyHeaders)) { $header = ''; foreach ($this->reportOnlyHeaders as $name => $value) { $header .= " {$name} {$value};"; } $response->appendHeader('Content-Security-Policy-Report-Only', $header); } $this->tempHeaders = []; $this->reportOnlyHeaders = []; } //-------------------------------------------------------------------- /** * Adds a directive and it's options to the appropriate header. The $values * array might have options that are geared toward either the regular or the * reportOnly header, since it's viable to have both simultaneously. * * @param string $name * @param array|string|null $values */ protected function addToHeader(string $name, $values = null) { if (is_string($values)) { $values = [$values => 0]; } $sources = []; $reportSources = []; foreach ($values as $value => $reportOnly) { if (is_numeric($value) && is_string($reportOnly) && ! empty($reportOnly)) { $value = $reportOnly; $reportOnly = 0; } if ($reportOnly === true) { $reportSources[] = in_array($value, $this->validSources) ? "'{$value}'" : $value; } else { if (strpos($value, 'nonce-') === 0) { $sources[] = "'{$value}'"; } else { $sources[] = in_array($value, $this->validSources) ? "'{$value}'" : $value; } } } if (! empty($sources)) { $this->tempHeaders[$name] = implode(' ', $sources); } if (! empty($reportSources)) { $this->reportOnlyHeaders[$name] = implode(' ', $reportSources); } } //-------------------------------------------------------------------- } |
Commits for paulgoughbooks_old/trunk/system/HTTP/ContentSecurityPolicy.php
Revision | Author | Commited | Message |
---|---|---|---|
2 | tporter | Tue 03 Nov, 2020 08:50:21 +0000 | Migration of Paul Goughs Books site to Codeignitor 4 |