mirror of
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974 lines
24 KiB
Python
974 lines
24 KiB
Python
# Copyright 2010-2023 Kurt McKee <contactme@kurtmckee.org>
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# Copyright 2002-2008 Mark Pilgrim
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# All rights reserved.
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#
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# This file is a part of feedparser.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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from __future__ import annotations
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import re
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from .html import BaseHTMLProcessor
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from .urls import make_safe_absolute_uri
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class HTMLSanitizer(BaseHTMLProcessor):
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acceptable_elements = {
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"a",
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"abbr",
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"acronym",
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"address",
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"area",
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"article",
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"aside",
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"audio",
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"b",
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"big",
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"blockquote",
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"br",
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"button",
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"canvas",
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"caption",
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"center",
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"cite",
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"code",
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"col",
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"colgroup",
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"command",
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"datagrid",
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"datalist",
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"dd",
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"del",
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"details",
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"dfn",
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"dialog",
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"dir",
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"div",
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"dl",
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"dt",
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"em",
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"event-source",
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"fieldset",
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"figcaption",
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"figure",
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"font",
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"footer",
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"form",
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"h1",
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"h2",
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"h3",
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"h4",
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"h5",
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"h6",
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"header",
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"hr",
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"i",
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"img",
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"input",
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"ins",
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"kbd",
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"keygen",
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"label",
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"legend",
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"li",
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"m",
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"map",
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"menu",
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"meter",
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"multicol",
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"nav",
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"nextid",
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"noscript",
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"ol",
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"optgroup",
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"option",
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"output",
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"p",
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"pre",
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"progress",
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"q",
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"s",
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"samp",
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"section",
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"select",
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"small",
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"sound",
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"source",
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"spacer",
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"span",
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"strike",
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"strong",
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"sub",
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"sup",
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"table",
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"tbody",
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"td",
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"textarea",
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"tfoot",
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"th",
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"thead",
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"time",
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"tr",
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"tt",
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"u",
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"ul",
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"var",
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"video",
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}
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acceptable_attributes = {
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"abbr",
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"accept",
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"accept-charset",
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"accesskey",
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"action",
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"align",
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"alt",
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"autocomplete",
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"autofocus",
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"axis",
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"background",
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"balance",
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"bgcolor",
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"bgproperties",
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"border",
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"bordercolor",
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"bordercolordark",
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"bordercolorlight",
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"bottompadding",
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"cellpadding",
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"cellspacing",
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"ch",
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"challenge",
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"char",
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"charoff",
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"charset",
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"checked",
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"choff",
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"cite",
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"class",
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"clear",
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"color",
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"cols",
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"colspan",
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"compact",
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"contenteditable",
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"controls",
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"coords",
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"data",
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"datafld",
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"datapagesize",
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"datasrc",
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"datetime",
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"default",
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"delay",
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"dir",
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"disabled",
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"draggable",
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"dynsrc",
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"enctype",
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"end",
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"face",
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"for",
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"form",
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"frame",
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"galleryimg",
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"gutter",
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"headers",
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"height",
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"hidden",
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"hidefocus",
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"high",
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"href",
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"hreflang",
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"hspace",
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"icon",
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"id",
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"inputmode",
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"ismap",
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"keytype",
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"label",
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"lang",
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"leftspacing",
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"list",
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"longdesc",
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"loop",
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"loopcount",
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"loopend",
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"loopstart",
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"low",
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"lowsrc",
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"max",
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"maxlength",
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"media",
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"method",
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"min",
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"multiple",
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"name",
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"nohref",
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"noshade",
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"nowrap",
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"open",
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"optimum",
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"pattern",
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"ping",
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"point-size",
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"poster",
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"pqg",
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"preload",
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"prompt",
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"radiogroup",
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"readonly",
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"rel",
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"repeat-max",
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"repeat-min",
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"replace",
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"required",
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"rev",
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"rightspacing",
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"rows",
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"rowspan",
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"rules",
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"scope",
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"selected",
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"shape",
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"size",
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"span",
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"src",
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"start",
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"step",
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"style",
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"summary",
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"suppress",
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"tabindex",
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"target",
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"template",
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"title",
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"toppadding",
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"type",
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"unselectable",
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"urn",
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"usemap",
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"valign",
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"value",
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"variable",
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"volume",
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"vrml",
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"vspace",
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"width",
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"wrap",
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"xml:lang",
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}
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unacceptable_elements_with_end_tag = {
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"applet",
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"script",
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"style",
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}
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acceptable_css_properties = {
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"azimuth",
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"background-color",
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"border-bottom-color",
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"border-collapse",
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"border-color",
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"border-left-color",
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"border-right-color",
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"border-top-color",
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"clear",
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"color",
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"cursor",
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"direction",
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"display",
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"elevation",
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"float",
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"font",
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"font-family",
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"font-size",
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"font-style",
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"font-variant",
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"font-weight",
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"height",
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"letter-spacing",
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"line-height",
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"overflow",
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"pause",
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"pause-after",
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"pause-before",
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"pitch",
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"pitch-range",
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"richness",
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"speak",
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"speak-header",
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"speak-numeral",
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"speak-punctuation",
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"speech-rate",
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"stress",
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"text-align",
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"text-decoration",
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"text-indent",
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"unicode-bidi",
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"vertical-align",
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"voice-family",
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"volume",
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"white-space",
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"width",
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}
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# survey of common keywords found in feeds
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acceptable_css_keywords = {
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"!important",
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"aqua",
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"auto",
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"black",
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"block",
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"blue",
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"bold",
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"both",
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"bottom",
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"brown",
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"center",
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"collapse",
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"dashed",
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"dotted",
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"fuchsia",
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"gray",
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"green",
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"italic",
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"left",
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"lime",
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"maroon",
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"medium",
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"navy",
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"none",
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"normal",
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"nowrap",
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"olive",
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"pointer",
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"purple",
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"red",
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"right",
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"silver",
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"solid",
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"teal",
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"top",
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"transparent",
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"underline",
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"white",
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"yellow",
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}
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valid_css_values = re.compile(
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r"^("
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r"#[0-9a-f]+" # Hex values
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r"|rgb\(\d+%?,\d*%?,?\d*%?\)?" # RGB values
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r"|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?" # Sizes/widths
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r")$"
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)
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mathml_elements = {
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"annotation",
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"annotation-xml",
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"maction",
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"maligngroup",
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"malignmark",
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"math",
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"menclose",
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"merror",
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"mfenced",
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"mfrac",
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"mglyph",
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"mi",
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"mlabeledtr",
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"mlongdiv",
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"mmultiscripts",
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"mn",
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"mo",
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"mover",
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"mpadded",
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"mphantom",
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"mprescripts",
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"mroot",
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"mrow",
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"ms",
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"mscarries",
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"mscarry",
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"msgroup",
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"msline",
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"mspace",
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"msqrt",
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"msrow",
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"mstack",
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"mstyle",
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"msub",
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"msubsup",
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"msup",
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"mtable",
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"mtd",
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"mtext",
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"mtr",
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"munder",
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"munderover",
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"none",
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"semantics",
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}
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mathml_attributes = {
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"accent",
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"accentunder",
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"actiontype",
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"align",
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"alignmentscope",
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"altimg",
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"altimg-height",
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"altimg-valign",
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"altimg-width",
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"alttext",
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"bevelled",
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"charalign",
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"close",
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"columnalign",
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"columnlines",
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"columnspacing",
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"columnspan",
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"columnwidth",
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"crossout",
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"decimalpoint",
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"denomalign",
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"depth",
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"dir",
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"display",
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"displaystyle",
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"edge",
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"encoding",
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"equalcolumns",
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"equalrows",
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"fence",
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"fontstyle",
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"fontweight",
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"form",
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"frame",
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"framespacing",
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"groupalign",
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"height",
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"href",
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"id",
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"indentalign",
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"indentalignfirst",
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"indentalignlast",
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"indentshift",
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"indentshiftfirst",
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"indentshiftlast",
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"indenttarget",
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"infixlinebreakstyle",
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"largeop",
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"length",
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"linebreak",
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"linebreakmultchar",
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"linebreakstyle",
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"lineleading",
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"linethickness",
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"location",
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"longdivstyle",
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"lquote",
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"lspace",
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"mathbackground",
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"mathcolor",
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"mathsize",
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"mathvariant",
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"maxsize",
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"minlabelspacing",
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"minsize",
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"movablelimits",
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"notation",
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"numalign",
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"open",
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"other",
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"overflow",
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"position",
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"rowalign",
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"rowlines",
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"rowspacing",
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"rowspan",
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"rquote",
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"rspace",
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"scriptlevel",
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"scriptminsize",
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"scriptsizemultiplier",
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"selection",
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"separator",
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"separators",
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"shift",
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"side",
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"src",
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"stackalign",
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"stretchy",
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"subscriptshift",
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"superscriptshift",
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"symmetric",
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"voffset",
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"width",
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"xlink:href",
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"xlink:show",
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"xlink:type",
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"xmlns",
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"xmlns:xlink",
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}
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# svgtiny - foreignObject + linearGradient + radialGradient + stop
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svg_elements = {
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"a",
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"animate",
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"animateColor",
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"animateMotion",
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"animateTransform",
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"circle",
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"defs",
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"desc",
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"ellipse",
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"font-face",
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"font-face-name",
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"font-face-src",
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"foreignObject",
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"g",
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"glyph",
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"hkern",
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"line",
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"linearGradient",
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"marker",
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"metadata",
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"missing-glyph",
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"mpath",
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"path",
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"polygon",
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"polyline",
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"radialGradient",
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"rect",
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"set",
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"stop",
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"svg",
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"switch",
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"text",
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"title",
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"tspan",
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"use",
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}
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# svgtiny + class + opacity + offset + xmlns + xmlns:xlink
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svg_attributes = {
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"accent-height",
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"accumulate",
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"additive",
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"alphabetic",
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"arabic-form",
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"ascent",
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"attributeName",
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"attributeType",
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"baseProfile",
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"bbox",
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"begin",
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"by",
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"calcMode",
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"cap-height",
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"class",
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"color",
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"color-rendering",
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"content",
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"cx",
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"cy",
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"d",
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"descent",
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"display",
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"dur",
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"dx",
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"dy",
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"end",
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"fill",
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"fill-opacity",
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"fill-rule",
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"font-family",
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"font-size",
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"font-stretch",
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"font-style",
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"font-variant",
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"font-weight",
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"from",
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"fx",
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"fy",
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"g1",
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"g2",
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"glyph-name",
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"gradientUnits",
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"hanging",
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"height",
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"horiz-adv-x",
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"horiz-origin-x",
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"id",
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"ideographic",
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"k",
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"keyPoints",
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"keySplines",
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"keyTimes",
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"lang",
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"marker-end",
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"marker-mid",
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"marker-start",
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"markerHeight",
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"markerUnits",
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"markerWidth",
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"mathematical",
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"max",
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"min",
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"name",
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"offset",
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"opacity",
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"orient",
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"origin",
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"overline-position",
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"overline-thickness",
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"panose-1",
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"path",
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"pathLength",
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"points",
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"preserveAspectRatio",
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"r",
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"refX",
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"refY",
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"repeatCount",
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"repeatDur",
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"requiredExtensions",
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"requiredFeatures",
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"restart",
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"rotate",
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"rx",
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"ry",
|
|
"slope",
|
|
"stemh",
|
|
"stemv",
|
|
"stop-color",
|
|
"stop-opacity",
|
|
"strikethrough-position",
|
|
"strikethrough-thickness",
|
|
"stroke",
|
|
"stroke-dasharray",
|
|
"stroke-dashoffset",
|
|
"stroke-linecap",
|
|
"stroke-linejoin",
|
|
"stroke-miterlimit",
|
|
"stroke-opacity",
|
|
"stroke-width",
|
|
"systemLanguage",
|
|
"target",
|
|
"text-anchor",
|
|
"to",
|
|
"transform",
|
|
"type",
|
|
"u1",
|
|
"u2",
|
|
"underline-position",
|
|
"underline-thickness",
|
|
"unicode",
|
|
"unicode-range",
|
|
"units-per-em",
|
|
"values",
|
|
"version",
|
|
"viewBox",
|
|
"visibility",
|
|
"width",
|
|
"widths",
|
|
"x",
|
|
"x-height",
|
|
"x1",
|
|
"x2",
|
|
"xlink:actuate",
|
|
"xlink:arcrole",
|
|
"xlink:href",
|
|
"xlink:role",
|
|
"xlink:show",
|
|
"xlink:title",
|
|
"xlink:type",
|
|
"xml:base",
|
|
"xml:lang",
|
|
"xml:space",
|
|
"xmlns",
|
|
"xmlns:xlink",
|
|
"y",
|
|
"y1",
|
|
"y2",
|
|
"zoomAndPan",
|
|
}
|
|
|
|
svg_attr_map = None
|
|
svg_elem_map = None
|
|
|
|
acceptable_svg_properties = {
|
|
"fill",
|
|
"fill-opacity",
|
|
"fill-rule",
|
|
"stroke",
|
|
"stroke-linecap",
|
|
"stroke-linejoin",
|
|
"stroke-opacity",
|
|
"stroke-width",
|
|
}
|
|
|
|
def __init__(self, encoding=None, _type="application/xhtml+xml"):
|
|
super().__init__(encoding, _type)
|
|
|
|
self.unacceptablestack = 0
|
|
self.mathmlOK = 0
|
|
self.svgOK = 0
|
|
|
|
def reset(self):
|
|
super().reset()
|
|
self.unacceptablestack = 0
|
|
self.mathmlOK = 0
|
|
self.svgOK = 0
|
|
|
|
def unknown_starttag(self, tag, attrs):
|
|
acceptable_attributes = self.acceptable_attributes
|
|
keymap = {}
|
|
if tag not in self.acceptable_elements or self.svgOK:
|
|
if tag in self.unacceptable_elements_with_end_tag:
|
|
self.unacceptablestack += 1
|
|
|
|
# add implicit namespaces to html5 inline svg/mathml
|
|
if self._type.endswith("html"):
|
|
if not dict(attrs).get("xmlns"):
|
|
if tag == "svg":
|
|
attrs.append(("xmlns", "http://www.w3.org/2000/svg"))
|
|
if tag == "math":
|
|
attrs.append(("xmlns", "http://www.w3.org/1998/Math/MathML"))
|
|
|
|
# not otherwise acceptable, perhaps it is MathML or SVG?
|
|
if (
|
|
tag == "math"
|
|
and ("xmlns", "http://www.w3.org/1998/Math/MathML") in attrs
|
|
):
|
|
self.mathmlOK += 1
|
|
if tag == "svg" and ("xmlns", "http://www.w3.org/2000/svg") in attrs:
|
|
self.svgOK += 1
|
|
|
|
# chose acceptable attributes based on tag class, else bail
|
|
if self.mathmlOK and tag in self.mathml_elements:
|
|
acceptable_attributes = self.mathml_attributes
|
|
elif self.svgOK and tag in self.svg_elements:
|
|
# For most vocabularies, lowercasing is a good idea. Many
|
|
# svg elements, however, are camel case.
|
|
if not self.svg_attr_map:
|
|
lower = [attr.lower() for attr in self.svg_attributes]
|
|
mix = [a for a in self.svg_attributes if a not in lower]
|
|
self.svg_attributes = lower
|
|
self.svg_attr_map = {a.lower(): a for a in mix}
|
|
|
|
lower = [attr.lower() for attr in self.svg_elements]
|
|
mix = [a for a in self.svg_elements if a not in lower]
|
|
self.svg_elements = lower
|
|
self.svg_elem_map = {a.lower(): a for a in mix}
|
|
acceptable_attributes = self.svg_attributes
|
|
tag = self.svg_elem_map.get(tag, tag)
|
|
keymap = self.svg_attr_map
|
|
elif tag not in self.acceptable_elements:
|
|
return
|
|
|
|
# declare xlink namespace, if needed
|
|
if self.mathmlOK or self.svgOK:
|
|
if any(a for a in attrs if a[0].startswith("xlink:")):
|
|
if not ("xmlns:xlink", "http://www.w3.org/1999/xlink") in attrs:
|
|
attrs.append(("xmlns:xlink", "http://www.w3.org/1999/xlink"))
|
|
|
|
clean_attrs = []
|
|
for key, value in self.normalize_attrs(attrs):
|
|
if key == "style" and "style" in acceptable_attributes:
|
|
clean_value = self.sanitize_style(value)
|
|
if clean_value:
|
|
clean_attrs.append((key, clean_value))
|
|
elif key in acceptable_attributes:
|
|
key = keymap.get(key, key)
|
|
# make sure the uri uses an acceptable uri scheme
|
|
if key == "href":
|
|
value = make_safe_absolute_uri(value)
|
|
clean_attrs.append((key, value))
|
|
super().unknown_starttag(tag, clean_attrs)
|
|
|
|
def unknown_endtag(self, tag):
|
|
if tag not in self.acceptable_elements:
|
|
if tag in self.unacceptable_elements_with_end_tag:
|
|
self.unacceptablestack -= 1
|
|
if self.mathmlOK and tag in self.mathml_elements:
|
|
if tag == "math" and self.mathmlOK:
|
|
self.mathmlOK -= 1
|
|
elif self.svgOK and tag in self.svg_elements:
|
|
tag = self.svg_elem_map.get(tag, tag)
|
|
if tag == "svg" and self.svgOK:
|
|
self.svgOK -= 1
|
|
else:
|
|
return
|
|
super().unknown_endtag(tag)
|
|
|
|
def handle_pi(self, text):
|
|
pass
|
|
|
|
def handle_decl(self, text):
|
|
pass
|
|
|
|
def handle_data(self, text):
|
|
if not self.unacceptablestack:
|
|
super().handle_data(text)
|
|
|
|
def sanitize_style(self, style):
|
|
# disallow urls
|
|
style = re.compile(r"url\s*\(\s*[^\s)]+?\s*\)\s*").sub(" ", style)
|
|
|
|
# gauntlet
|
|
if not re.match(
|
|
r"""^([:,;#%.\sa-zA-Z0-9!]|\w-\w|'[\s\w]+'|"[\s\w]+"|\([\d,\s]+\))*$""",
|
|
style,
|
|
):
|
|
return ""
|
|
# This replaced a regexp that used re.match and was prone to
|
|
# pathological back-tracking.
|
|
if re.sub(r"\s*[-\w]+\s*:\s*[^:;]*;?", "", style).strip():
|
|
return ""
|
|
|
|
clean = []
|
|
for prop, value in re.findall(r"([-\w]+)\s*:\s*([^:;]*)", style):
|
|
if not value:
|
|
continue
|
|
if prop.lower() in self.acceptable_css_properties:
|
|
clean.append(prop + ": " + value + ";")
|
|
elif prop.split("-")[0].lower() in [
|
|
"background",
|
|
"border",
|
|
"margin",
|
|
"padding",
|
|
]:
|
|
for keyword in value.split():
|
|
if (
|
|
keyword not in self.acceptable_css_keywords
|
|
and not self.valid_css_values.match(keyword)
|
|
):
|
|
break
|
|
else:
|
|
clean.append(prop + ": " + value + ";")
|
|
elif self.svgOK and prop.lower() in self.acceptable_svg_properties:
|
|
clean.append(prop + ": " + value + ";")
|
|
|
|
return " ".join(clean)
|
|
|
|
def parse_comment(self, i, report=1):
|
|
ret = super().parse_comment(i, report)
|
|
if ret >= 0:
|
|
return ret
|
|
# if ret == -1, this may be a malicious attempt to circumvent
|
|
# sanitization, or a page-destroying unclosed comment
|
|
match = re.compile(r"--[^>]*>").search(self.rawdata, i + 4)
|
|
if match:
|
|
return match.end()
|
|
# unclosed comment; deliberately fail to handle_data()
|
|
return len(self.rawdata)
|
|
|
|
|
|
def sanitize_html(html_source, encoding, _type):
|
|
p = HTMLSanitizer(encoding, _type)
|
|
html_source = html_source.replace("<![CDATA[", "<![CDATA[")
|
|
p.feed(html_source)
|
|
data = p.output()
|
|
data = data.strip().replace("\r\n", "\n")
|
|
return data
|
|
|
|
|
|
# Match XML entity declarations.
|
|
# Example: <!ENTITY copyright "(C)">
|
|
RE_ENTITY_PATTERN = re.compile(rb"^\s*<!ENTITY([^>]*?)>", re.MULTILINE)
|
|
|
|
# Match XML DOCTYPE declarations.
|
|
# Example: <!DOCTYPE feed [ ]>
|
|
RE_DOCTYPE_PATTERN = re.compile(rb"^\s*<!DOCTYPE([^>]*?)>", re.MULTILINE)
|
|
|
|
# Match safe entity declarations.
|
|
# This will allow hexadecimal character references through,
|
|
# as well as text, but not arbitrary nested entities.
|
|
# Example: cubed "³"
|
|
# Example: copyright "(C)"
|
|
# Forbidden: explode1 "&explode2;&explode2;"
|
|
RE_SAFE_ENTITY_PATTERN = re.compile(rb'\s+(\w+)\s+"(&#\w+;|[^&"]*)"')
|
|
|
|
|
|
def replace_doctype(data: bytes) -> tuple[str | None, bytes, dict[str, str]]:
|
|
"""Strip and replaces the DOCTYPE.
|
|
|
|
One RSS format -- Netscape's RSS 0.91 -- is identified within the XML declaration.
|
|
Therefore, this function must identify that version while replacing the DOCTYPE.
|
|
|
|
As a convenience to the loose XML parser, entities are pre-computed and returned.
|
|
|
|
The tuple that is returned has the following values, in order:
|
|
|
|
1. The version extracted from the XML DOCTYPE.
|
|
The value will either be "rss091n" or None.
|
|
2. Binary XML content with a replaced DOCTYPE.
|
|
3. A dictionary of entities and replacements.
|
|
"""
|
|
|
|
# Verify this looks like an XML feed.
|
|
if not re.match(rb"^\s*<", data):
|
|
return None, data, {}
|
|
|
|
# Divide the document into two groups by finding the location
|
|
# of the first element that doesn't begin with '<?' or '<!'.
|
|
match = re.search(rb"<\w", data)
|
|
first_element = match.start() + 1 if match is not None else 0
|
|
head, data = data[:first_element], data[first_element:]
|
|
|
|
# Save, and then remove, any ENTITY declarations.
|
|
entity_results = RE_ENTITY_PATTERN.findall(head)
|
|
head = RE_ENTITY_PATTERN.sub(b"", head)
|
|
|
|
# Find the DOCTYPE declaration and check the feed type.
|
|
doctype_results = RE_DOCTYPE_PATTERN.findall(head)
|
|
doctype = doctype_results and doctype_results[0] or b""
|
|
if b"netscape" in doctype.lower():
|
|
version = "rss091n"
|
|
else:
|
|
version = None
|
|
|
|
# Re-insert the safe ENTITY declarations if a DOCTYPE was found.
|
|
replacement = b""
|
|
if len(doctype_results) == 1 and entity_results:
|
|
safe_entities = [e for e in entity_results if RE_SAFE_ENTITY_PATTERN.match(e)]
|
|
if safe_entities:
|
|
replacement = (
|
|
b"<!DOCTYPE feed [\n<!ENTITY"
|
|
+ b">\n<!ENTITY ".join(safe_entities)
|
|
+ b">\n]>"
|
|
)
|
|
data = RE_DOCTYPE_PATTERN.sub(replacement, head) + data
|
|
|
|
# Precompute the safe entities for the loose parser.
|
|
entities = {
|
|
k.decode("utf-8"): v.decode("utf-8")
|
|
for k, v in RE_SAFE_ENTITY_PATTERN.findall(replacement)
|
|
}
|
|
return version, data, entities
|