From b5cbf0cc3da70ded91e8b118e2a582026b1e6d61 Mon Sep 17 00:00:00 2001 From: Eli Barbosa Date: Sat, 9 Nov 2024 19:02:09 -0800 Subject: [PATCH] feat: Add option for safe iframe hosts using array lookup (#423) Co-authored-by: Edward Z. Yang --- configdoc/usage.xml | 5 +++++ library/HTMLPurifier/ConfigSchema/schema.ser | 2 +- .../ConfigSchema/schema/HTML.SafeIframe.txt | 2 +- .../ConfigSchema/schema/URI.SafeIframeHosts.txt | 14 ++++++++++++++ library/HTMLPurifier/URIFilter/SafeIframe.php | 9 +++++---- .../safe-iframe-youtube-with-array-lookup.htmlt | 8 ++++++++ tests/HTMLPurifier/Injector/RemoveEmptyTest.php | 6 ++++++ 7 files changed, 40 insertions(+), 6 deletions(-) create mode 100644 library/HTMLPurifier/ConfigSchema/schema/URI.SafeIframeHosts.txt create mode 100644 tests/HTMLPurifier/HTMLT/safe-iframe-youtube-with-array-lookup.htmlt diff --git a/configdoc/usage.xml b/configdoc/usage.xml index 05ff285f..08a69407 100644 --- a/configdoc/usage.xml +++ b/configdoc/usage.xml @@ -608,4 +608,9 @@ 35 + + + 67 + + diff --git a/library/HTMLPurifier/ConfigSchema/schema.ser b/library/HTMLPurifier/ConfigSchema/schema.ser index 3cd756be..031cabbf 100644 --- a/library/HTMLPurifier/ConfigSchema/schema.ser +++ 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\ No newline at end of file diff --git a/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeIframe.txt b/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeIframe.txt index 5eb6ec2b..5a5c103d 100644 --- a/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeIframe.txt +++ b/library/HTMLPurifier/ConfigSchema/schema/HTML.SafeIframe.txt @@ -6,7 +6,7 @@ DEFAULT: false

Whether or not to permit iframe tags in untrusted documents. This directive must be accompanied by a whitelist of permitted iframes, - such as %URI.SafeIframeRegexp, otherwise it will fatally error. + such as %URI.SafeIframeRegexp or %URI.SafeIframeHosts, otherwise it will fatally error. This directive has no effect on strict doctypes, as iframes are not valid.

diff --git a/library/HTMLPurifier/ConfigSchema/schema/URI.SafeIframeHosts.txt b/library/HTMLPurifier/ConfigSchema/schema/URI.SafeIframeHosts.txt new file mode 100644 index 00000000..c32b52c0 --- /dev/null +++ b/library/HTMLPurifier/ConfigSchema/schema/URI.SafeIframeHosts.txt @@ -0,0 +1,14 @@ +URI.SafeIframeHosts +TYPE: lookup/null +DEFAULT: null +--DESCRIPTION-- +

+ A whitelist which indicates what explicit hosts should be + allowed to embed iframe. See also %HTML.SafeIframeRegexp, + it has precedence over this config. Here are some example values: +

+ +--# vim: et sw=4 sts=4 diff --git a/library/HTMLPurifier/URIFilter/SafeIframe.php b/library/HTMLPurifier/URIFilter/SafeIframe.php index f609c47a..e826313f 100644 --- a/library/HTMLPurifier/URIFilter/SafeIframe.php +++ b/library/HTMLPurifier/URIFilter/SafeIframe.php @@ -57,11 +57,12 @@ class HTMLPurifier_URIFilter_SafeIframe extends HTMLPurifier_URIFilter return true; } // check if we actually have some whitelists enabled - if ($this->regexp === null) { - return false; + if ($this->regexp !== null) { + return preg_match($this->regexp, $uri->toString()); } - // actually check the whitelists - return preg_match($this->regexp, $uri->toString()); + // check if the host is in a whitelist for safe iframe hosts + $safeHosts = $config->get('URI.SafeIframeHosts'); + return $safeHosts !== null && isset($safeHosts[$uri->host]); } } diff --git a/tests/HTMLPurifier/HTMLT/safe-iframe-youtube-with-array-lookup.htmlt b/tests/HTMLPurifier/HTMLT/safe-iframe-youtube-with-array-lookup.htmlt new file mode 100644 index 00000000..5a7d0758 --- /dev/null +++ b/tests/HTMLPurifier/HTMLT/safe-iframe-youtube-with-array-lookup.htmlt @@ -0,0 +1,8 @@ +--INI-- +HTML.SafeIframe = true +URI.SafeIframeHosts = www.youtube.com +--HTML-- + +--EXPECT-- + +--# vim: et sw=4 sts=4 diff --git a/tests/HTMLPurifier/Injector/RemoveEmptyTest.php b/tests/HTMLPurifier/Injector/RemoveEmptyTest.php index 4a976acf..32b7f748 100644 --- a/tests/HTMLPurifier/Injector/RemoveEmptyTest.php +++ b/tests/HTMLPurifier/Injector/RemoveEmptyTest.php @@ -115,6 +115,12 @@ class HTMLPurifier_Injector_RemoveEmptyTest extends HTMLPurifier_InjectorHarness $this->assertResult('', ''); } + public function testRemoveDisallowedIframeDeniedByHostsList() + { + $this->config->set('HTML.SafeIframe', true); + $this->config->set('URI.SafeIframeHosts', ['www.youtube.com']); + $this->assertResult('', ''); + } } // vim: et sw=4 sts=4