SecurityHeaderMiddleware::isCSPReportingAvailable() - Code Metrics - Inspection of "Provide additional configuration options for CSP a..." - signify-nz/silverstripe-security-headers - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#6)

unknown

created 2021-08-24 23:12 UTC

isCSPReportingAvailable() B

↳ Parent: SecurityHeaderMiddleware

Complexity

Conditions	7
Paths	7

Size

Total Lines	39
Code Lines	19

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	7
eloc	19
c	0
b	0
f	0
nc	7
nop	0
dl	0
loc	39
rs	8.8333

<?php

namespace Signify\Middleware;

use Signify\Extensions\SecurityHeaderSiteconfigExtension;
use SilverStripe\Control\Director;
use SilverStripe\Control\HTTPRequest;
use SilverStripe\Control\Middleware\HTTPMiddleware;
use SilverStripe\Core\ClassInfo;
use SilverStripe\Core\Extensible;
use SilverStripe\Core\Config\Configurable;
use SilverStripe\Dev\TestOnly;
use SilverStripe\ORM\DB;
use SilverStripe\ORM\DataObject;
use SilverStripe\SiteConfig\SiteConfig;

class SecurityHeaderMiddleware implements HTTPMiddleware
{
    use Configurable;
    use Extensible;

    /**
     * An array of HTTP headers.
     * @config
     * @var array
     */
    private static $headers = [

        'global' => array(),
    ];

    /**
     * Whether to automatically add the CMS report endpoint to the CSP config.
     * @config
     * @var string
     */
    private static $enable_reporting = true;


    /**
     * The URI to report CSP violations to.
     * See routes.yml
     * @config
     * @var string
     */
    private static $report_uri = 'cspviolations/report';


    /**
     * Whether to use the report-to header and CSP directive.
     * @config
     * @var string
     */
    private static $use_report_to = false;


    /**
     * Whether subdomains should report to the same endpoint.
     * @config
     * @var string
     */
    private static $report_to_subdomains = false;


    /**
     * The group name for the report-to CSP directive.
     * @config
     * @var string
     */
    private static $report_to_group = 'signify-csp-violation';


    /**
     * Can isCSPReportingOnly be used safely.
     *
     * This is not a config option.
     *
     * @var boolean
     */
    private static $is_csp_reporting_safe = false;


    public function process(HTTPRequest $request, callable $delegate)
    {
        $response = $delegate($request);

        $headersConfig = (array) $this->config()->get('headers');
        if (empty($headersConfig['global'])) {
            return $response;
        }

        // Disable CSP
        if ($this->disableCSP()) {
            return $response;
        }

        $headersToSend = $headersConfig['global'];

        if (!$this->disableReporting() && $this->config()->get('use_report_to')) {
            $this->addReportToHeader($headersToSend);
        }

        // Update CSP header.
        if (array_key_exists('Content-Security-Policy', $headersToSend)) {
            $header = 'Content-Security-Policy';
            $headerValue = $headersToSend['Content-Security-Policy'];
            // Set report only mode if appropriate.
            if ($this->isCSPReportingOnly()) {
                unset($headersToSend['Content-Security-Policy']);
                $header = 'Content-Security-Policy-Report-Only';
            }
            // Update CSP header value.
            $headersToSend[$header] = $this->updateCspHeader($headerValue);
        }
        $this->extend('updateHeaders', $headersToSend, $request);

        // Add headers to response.
        foreach ($headersToSend as $header => $value) {
            if (empty($value)) {
                continue;
            }
            $value = preg_replace('/\v/', '', $value);
            $this->extend('updateHeader', $header, $value, $request);
            if ($value) {
                $response->addHeader($header, $value);
            }
        }

        return $response;
    }

    /**
     * Return true if the Disable CSP is checked
     *
     * @return boolean
     */
    public function disableCSP()
    {
        if (
            self::isCSPReportingAvailable() &&
            SiteConfig::current_site_config()->CSPReportingOnly == SecurityHeaderSiteconfigExtension::CSP_DISABLE
        ) {
            return true;
        }

        return false;
    }

    /**
     * Return true if the Disable reporting is checked
     *
     * The CMS setting can disable reporting even if the 'enable_reporting' is true
     *
     * @return boolean
     */
    public function disableReporting()
    {
        if (self::isCSPReportingAvailable()) {
            return SiteConfig::current_site_config()->CSPReportingOnly == SecurityHeaderSiteconfigExtension::CSP_WITHOUT_REPORTING ||
            !$this->config()->get('enable_reporting');
        }

        return false;
    }

    /**
     * Returns true if the Content-Security-Policy-Report-Only header should be used.
     *
     * @return boolean
     */
    public function isCSPReportingOnly()
    {
        if (
            self::isCSPReportingAvailable() &&
            SiteConfig::current_site_config()->CSPReportingOnly == SecurityHeaderSiteconfigExtension::CSP_REPORTING_ONLY
        ) {
            return true;
        }

        return false;
    }

    protected function getReportURI()
    {
        return Director::absoluteURL($this->config()->get('report_uri'));
    }

    protected function getIncludeSubdomains()
    {
        return $this->config()->get('report_to_subdomains');
    }

    protected function getReportToGroup()
    {
        return $this->config()->get('report_to_group');
    }

    protected function getReportURIDirective()
    {
        return "report-uri {$this->getReportURI()}";
    }

    protected function getReportToDirective()
    {
        return "report-to {$this->getReportToGroup()}";
    }

    protected function addReportToHeader(&$headers)
    {
        if (array_key_exists('Report-To', $headers)) {
            $headers['Report-To'] = $headers['Report-To'] . ',' . $this->getReportToHeader();
        } else {
            $headers['Report-To'] = $this->getReportToHeader();
        }
    }

    protected function getReportToHeader()
    {
        $header = [
            'group' => $this->getReportToGroup(),
            'max_age' => 1800,
            'endpoints' => [[
                'url' => $this->getReportURI(),
            ],],
            'include_subdomains' => $this->getIncludeSubdomains(),
        ];
        return json_encode($header);
    }

    protected function updateCspHeader($cspHeader)
    {
        if (!$this->disableReporting()) {
            // Add or update report-uri directive.
            if (strpos($cspHeader, 'report-uri')) {
                $cspHeader = str_replace('report-uri', $this->getReportURIDirective(), $cspHeader);
            } else {
                $cspHeader = rtrim($cspHeader, ';') . "; {$this->getReportURIDirective()};";
            }

            // Add report-to directive.
            // Note that unlike report-uri, only the first endpoint is used if multiple are declared.
            if ($this->config()->get('use_report_to')) {
                if (strpos($cspHeader, 'report-to') === false) {
                    $cspHeader = rtrim($cspHeader, ';') . "; {$this->getReportToDirective()};";
                }
            }
        }

        return $cspHeader;
    }

    /**
     * Is the CSPReportingOnly field safe to read.
     *
     * If the module is installed and the codebase is flushed before the database has been built,
     * accessing SiteConfig causes an error.
     *
     * @return boolean
     */
    private static function isCSPReportingAvailable()
    {
        // Cached true value.
        if (self::$is_csp_reporting_safe) {
            return self::$is_csp_reporting_safe;
        }

        // Check if all tables and fields required for the class exist in the database.
        $requiredClasses = ClassInfo::dataClassesFor(SiteConfig::class);
        $schema = DataObject::getSchema();
        foreach (array_unique($requiredClasses) as $required) {
            // Skip test classes, as not all test classes are scaffolded at once
            if (is_a($required, TestOnly::class, true)) {
                continue;
            }

            // if any of the tables aren't created in the database
            $table = $schema->tableName($required);
            if (!ClassInfo::hasTable($table)) {
                return false;
            }

            // if any of the tables don't have any fields mapped as table columns
            $dbFields = DB::field_list($table);
            if (!$dbFields) {

                return false;
            }

            // if any of the tables are missing fields mapped as table columns
            $objFields = $schema->databaseFields($required, false);
            $missingFields = array_diff_key($objFields, $dbFields);
            if ($missingFields) {

                return false;
            }
        }

        self::$is_csp_reporting_safe = true;

        return true;
    }
}


1			<?php
2
3			namespace Signify\Middleware;
4
5			use Signify\Extensions\SecurityHeaderSiteconfigExtension;
6			use SilverStripe\Control\Director;
7			use SilverStripe\Control\HTTPRequest;
8			use SilverStripe\Control\Middleware\HTTPMiddleware;
9			use SilverStripe\Core\ClassInfo;
10			use SilverStripe\Core\Extensible;
11			use SilverStripe\Core\Config\Configurable;
12			use SilverStripe\Dev\TestOnly;
13			use SilverStripe\ORM\DB;
14			use SilverStripe\ORM\DataObject;
15			use SilverStripe\SiteConfig\SiteConfig;
16
17			class SecurityHeaderMiddleware implements HTTPMiddleware
18			{
19			use Configurable;
20			use Extensible;
21
22			/**
23			* An array of HTTP headers.
24			* @config
25			* @var array
26			*/
27			private static $headers = [
			0 ignored issues – show introduced 2020-11-30 05:33 UTC by Report Bug Copy Issue Report The private property `$headers` is not used, and could be removed. Loading history...
28			'global' => array(),
29			];
30
31			/**
32			* Whether to automatically add the CMS report endpoint to the CSP config.
33			* @config
34			* @var string
35			*/
36			private static $enable_reporting = true;
			0 ignored issues – show introduced 2020-11-30 05:33 UTC by Report Bug Copy Issue Report The private property `$enable_reporting` is not used, and could be removed. Loading history...
37
38			/**
39			* The URI to report CSP violations to.
40			* See routes.yml
41			* @config
42			* @var string
43			*/
44			private static $report_uri = 'cspviolations/report';
			0 ignored issues – show introduced 2020-11-30 05:33 UTC by Report Bug Copy Issue Report The private property `$report_uri` is not used, and could be removed. Loading history...
45
46			/**
47			* Whether to use the report-to header and CSP directive.
48			* @config
49			* @var string
50			*/
51			private static $use_report_to = false;
			0 ignored issues – show introduced 2020-11-30 05:33 UTC by Report Bug Copy Issue Report The private property `$use_report_to` is not used, and could be removed. Loading history...
52
53			/**
54			* Whether subdomains should report to the same endpoint.
55			* @config
56			* @var string
57			*/
58			private static $report_to_subdomains = false;
			0 ignored issues – show introduced 2020-11-30 05:33 UTC by Report Bug Copy Issue Report The private property `$report_to_subdomains` is not used, and could be removed. Loading history...
59
60			/**
61			* The group name for the report-to CSP directive.
62			* @config
63			* @var string
64			*/
65			private static $report_to_group = 'signify-csp-violation';
			0 ignored issues – show introduced 2020-11-30 05:33 UTC by Report Bug Copy Issue Report The private property `$report_to_group` is not used, and could be removed. Loading history...
66
67			/**
68			* Can isCSPReportingOnly be used safely.
69			*
70			* This is not a config option.
71			*
72			* @var boolean
73			*/
74			private static $is_csp_reporting_safe = false;
75
76
77			public function process(HTTPRequest $request, callable $delegate)
78			{
79			$response = $delegate($request);
80
81			$headersConfig = (array) $this->config()->get('headers');
82			if (empty($headersConfig['global'])) {
83			return $response;
84			}
85
86			// Disable CSP
87			if ($this->disableCSP()) {
88			return $response;
89			}
90
91			$headersToSend = $headersConfig['global'];
92
93			if (!$this->disableReporting() && $this->config()->get('use_report_to')) {
94			$this->addReportToHeader($headersToSend);
95			}
96
97			// Update CSP header.
98			if (array_key_exists('Content-Security-Policy', $headersToSend)) {
99			$header = 'Content-Security-Policy';
100			$headerValue = $headersToSend['Content-Security-Policy'];
101			// Set report only mode if appropriate.
102			if ($this->isCSPReportingOnly()) {
103			unset($headersToSend['Content-Security-Policy']);
104			$header = 'Content-Security-Policy-Report-Only';
105			}
106			// Update CSP header value.
107			$headersToSend[$header] = $this->updateCspHeader($headerValue);
108			}
109			$this->extend('updateHeaders', $headersToSend, $request);
110
111			// Add headers to response.
112			foreach ($headersToSend as $header => $value) {
113			if (empty($value)) {
114			continue;
115			}
116			$value = preg_replace('/\v/', '', $value);
117			$this->extend('updateHeader', $header, $value, $request);
118			if ($value) {
119			$response->addHeader($header, $value);
120			}
121			}
122
123			return $response;
124			}
125
126			/**
127			* Return true if the Disable CSP is checked
128			*
129			* @return boolean
130			*/
131			public function disableCSP()
132			{
133			if (
134			self::isCSPReportingAvailable() &&
135			SiteConfig::current_site_config()->CSPReportingOnly == SecurityHeaderSiteconfigExtension::CSP_DISABLE
136			) {
137			return true;
138			}
139
140			return false;
141			}
142
143			/**
144			* Return true if the Disable reporting is checked
145			*
146			* The CMS setting can disable reporting even if the 'enable_reporting' is true
147			*
148			* @return boolean
149			*/
150			public function disableReporting()
151			{
152			if (self::isCSPReportingAvailable()) {
153			return SiteConfig::current_site_config()->CSPReportingOnly == SecurityHeaderSiteconfigExtension::CSP_WITHOUT_REPORTING \|\|
154			!$this->config()->get('enable_reporting');
155			}
156
157			return false;
158			}
159
160			/**
161			* Returns true if the Content-Security-Policy-Report-Only header should be used.
162			*
163			* @return boolean
164			*/
165			public function isCSPReportingOnly()
166			{
167			if (
168			self::isCSPReportingAvailable() &&
169			SiteConfig::current_site_config()->CSPReportingOnly == SecurityHeaderSiteconfigExtension::CSP_REPORTING_ONLY
170			) {
171			return true;
172			}
173
174			return false;
175			}
176
177			protected function getReportURI()
178			{
179			return Director::absoluteURL($this->config()->get('report_uri'));
180			}
181
182			protected function getIncludeSubdomains()
183			{
184			return $this->config()->get('report_to_subdomains');
185			}
186
187			protected function getReportToGroup()
188			{
189			return $this->config()->get('report_to_group');
190			}
191
192			protected function getReportURIDirective()
193			{
194			return "report-uri {$this->getReportURI()}";
195			}
196
197			protected function getReportToDirective()
198			{
199			return "report-to {$this->getReportToGroup()}";
200			}
201
202			protected function addReportToHeader(&$headers)
203			{
204			if (array_key_exists('Report-To', $headers)) {
205			$headers['Report-To'] = $headers['Report-To'] . ',' . $this->getReportToHeader();
206			} else {
207			$headers['Report-To'] = $this->getReportToHeader();
208			}
209			}
210
211			protected function getReportToHeader()
212			{
213			$header = [
214			'group' => $this->getReportToGroup(),
215			'max_age' => 1800,
216			'endpoints' => [[
217			'url' => $this->getReportURI(),
218			],],
219			'include_subdomains' => $this->getIncludeSubdomains(),
220			];
221			return json_encode($header);
222			}
223
224			protected function updateCspHeader($cspHeader)
225			{
226			if (!$this->disableReporting()) {
227			// Add or update report-uri directive.
228			if (strpos($cspHeader, 'report-uri')) {
229			$cspHeader = str_replace('report-uri', $this->getReportURIDirective(), $cspHeader);
230			} else {
231			$cspHeader = rtrim($cspHeader, ';') . "; {$this->getReportURIDirective()};";
232			}
233
234			// Add report-to directive.
235			// Note that unlike report-uri, only the first endpoint is used if multiple are declared.
236			if ($this->config()->get('use_report_to')) {
237			if (strpos($cspHeader, 'report-to') === false) {
238			$cspHeader = rtrim($cspHeader, ';') . "; {$this->getReportToDirective()};";
239			}
240			}
241			}
242
243			return $cspHeader;
244			}
245
246			/**
247			* Is the CSPReportingOnly field safe to read.
248			*
249			* If the module is installed and the codebase is flushed before the database has been built,
250			* accessing SiteConfig causes an error.
251			*
252			* @return boolean
253			*/
254			private static function isCSPReportingAvailable()
255			{
256			// Cached true value.
257			if (self::$is_csp_reporting_safe) {
258			return self::$is_csp_reporting_safe;
259			}
260
261			// Check if all tables and fields required for the class exist in the database.
262			$requiredClasses = ClassInfo::dataClassesFor(SiteConfig::class);
263			$schema = DataObject::getSchema();
264			foreach (array_unique($requiredClasses) as $required) {
265			// Skip test classes, as not all test classes are scaffolded at once
266			if (is_a($required, TestOnly::class, true)) {
267			continue;
268			}
269
270			// if any of the tables aren't created in the database
271			$table = $schema->tableName($required);
272			if (!ClassInfo::hasTable($table)) {
273			return false;
274			}
275
276			// if any of the tables don't have any fields mapped as table columns
277			$dbFields = DB::field_list($table);
278			if (!$dbFields) {
			0 ignored issues – show Bug Best Practice introduced 2021-06-04 02:24 UTC by Report Bug Copy Issue Report The expression `$dbFields` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
279			return false;
280			}
281
282			// if any of the tables are missing fields mapped as table columns
283			$objFields = $schema->databaseFields($required, false);
284			$missingFields = array_diff_key($objFields, $dbFields);
285			if ($missingFields) {
			0 ignored issues – show Bug Best Practice introduced 2021-06-04 02:24 UTC by Report Bug Copy Issue Report The expression `$missingFields` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `! empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
286			return false;
287			}
288			}
289
290			self::$is_csp_reporting_safe = true;
291
292			return true;
293			}
294			}
295

signify-nz / silverstripe-security-headers

Pull Request — master (#6)

isCSPReportingAvailable() B

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Duplication

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