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950 lines
23 KiB
Python
950 lines
23 KiB
Python
# Copyright 2010-2022 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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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',
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'slope',
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'stemh',
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'stemv',
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'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(br'^\s*<!ENTITY([^>]*?)>', re.MULTILINE)
|
|
|
|
# Match XML DOCTYPE declarations.
|
|
# Example: <!DOCTYPE feed [ ]>
|
|
RE_DOCTYPE_PATTERN = re.compile(br'^\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(br'\s+(\w+)\s+"(&#\w+;|[^&"]*)"')
|
|
|
|
|
|
def replace_doctype(data):
|
|
"""Strips and replaces the DOCTYPE, returns (rss_version, stripped_data)
|
|
|
|
rss_version may be 'rss091n' or None
|
|
stripped_data is the same XML document with a replaced DOCTYPE
|
|
"""
|
|
|
|
# Divide the document into two groups by finding the location
|
|
# of the first element that doesn't begin with '<?' or '<!'.
|
|
start = re.search(br'<\w', data)
|
|
start = start and start.start() or -1
|
|
head, data = data[:start+1], data[start+1:]
|
|
|
|
# Save and then remove all of the 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.
|
|
safe_entities = {
|
|
k.decode('utf-8'): v.decode('utf-8')
|
|
for k, v in RE_SAFE_ENTITY_PATTERN.findall(replacement)
|
|
}
|
|
return version, data, safe_entities
|