Merge pull request from GHSA-ccm4-vgcc-73hp

* Tighten allowed HTML in oEmbed-based preview cards

* Sanitize preview cards at render time

* Add `sandbox` attribute to preview card iframes
Claire 2023-07-06 15:03:33 +02:00 committed by Rin
parent ff0a267d03
commit 56d7c5badc
Signed by: Rin
GPG Key ID: 0C8733C13A7E1293
2 changed files with 15 additions and 11 deletions

View File

@ -11,4 +11,8 @@ class REST::PreviewCardSerializer < ActiveModel::Serializer
def image
object.image? ? full_asset_url(object.image.url(:original)) : nil
end
def html
Sanitize.fragment(object.html, Sanitize::Config::MASTODON_OEMBED)
end
end

View File

@ -107,26 +107,26 @@ class Sanitize
]
)
MASTODON_OEMBED ||= freeze_config merge(
RELAXED,
elements: RELAXED[:elements] + %w(audio embed iframe source video),
MASTODON_OEMBED ||= freeze_config(
elements: %w(audio embed iframe source video),
attributes: merge(
RELAXED[:attributes],
attributes: {
'audio' => %w(controls),
'embed' => %w(height src type width),
'iframe' => %w(allowfullscreen frameborder height scrolling src width),
'source' => %w(src type),
'video' => %w(controls height loop width),
'div' => [:data]
),
},
protocols: merge(
RELAXED[:protocols],
protocols: {
'embed' => { 'src' => HTTP_PROTOCOLS },
'iframe' => { 'src' => HTTP_PROTOCOLS },
'source' => { 'src' => HTTP_PROTOCOLS }
)
'source' => { 'src' => HTTP_PROTOCOLS },
},
add_attributes: {
'iframe' => { 'sandbox' => 'allow-scripts allow-same-origin allow-popups allow-popups-to-escape-sandbox allow-forms' },
}
)
LINK_REL_TRANSFORMER = lambda do |env|