/usr/lib/python2.7/dist-packages/Evtx/Views.py is in python-evtx 0.6.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of python-evtx.
#
# Copyright 2012, 2013 Willi Ballenthin <william.ballenthin@mandiant.com>
# while at Mandiant <http://www.mandiant.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import
import re
import xml.sax.saxutils
import six
import Evtx.Nodes as e_nodes
XML_HEADER = "<?xml version=\"1.1\" encoding=\"utf-8\" standalone=\"yes\" ?>\n"
class UnexpectedElementException(Exception):
def __init__(self, msg):
super(UnexpectedElementException, self).__init__(msg)
# ref: https://www.w3.org/TR/xml11/#charsets
RESTRICTED_CHARS = re.compile('[\x01-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F]')
def escape_attr(s):
'''
escape the given string such that it can be placed in an XML attribute, like:
<foo bar='$value'>
Args:
s (str): the string to escape.
Returns:
str: the escaped string.
'''
esc = xml.sax.saxutils.quoteattr(s)
esc = esc.encode('ascii', 'xmlcharrefreplace').decode('ascii')
esc = RESTRICTED_CHARS.sub('', esc)
return esc
def escape_value(s):
'''
escape the given string such that it can be placed in an XML value location, like:
<foo>
$value
</foo>
Args:
s (str): the string to escape.
Returns:
str: the escaped string.
'''
esc = xml.sax.saxutils.escape(s)
esc = esc.encode('ascii', 'xmlcharrefreplace').decode('ascii')
esc = RESTRICTED_CHARS.sub('', esc)
return esc
# ref: https://www.w3.org/TR/xml/#NT-NameStartChar
# but we are going to require a even stricter subset.
NAME_PATTERN = re.compile('[a-zA-Z_][a-zA-Z_\-]*')
def validate_name(s):
'''
ensure the given name can be used as an XML entity name, such as tag or attribute name.
Args:
s (str): the string to validate.
Raises:
RuntimeError: if the string is not suitable to be an XML name.
'''
if not NAME_PATTERN.match(s):
raise RuntimeError('invalid xml name: %s' % (s))
return s
def render_root_node_with_subs(root_node, subs):
"""
render the given root node using the given substitutions into XML.
Args:
root_node (e_nodes.RootNode): the node to render.
subs (list[str]): the substitutions that maybe included in the XML.
Returns:
str: the rendered XML document.
"""
def rec(node, acc):
if isinstance(node, e_nodes.EndOfStreamNode):
pass # intended
elif isinstance(node, e_nodes.OpenStartElementNode):
acc.append("<")
acc.append(node.tag_name())
for child in node.children():
if isinstance(child, e_nodes.AttributeNode):
acc.append(" ")
acc.append(validate_name(child.attribute_name().string()))
acc.append("=\"")
# TODO: should use xml.sax.saxutils.quoteattr here
# but to do so, we'd need to ensure we're not double-quoting this value.
rec(child.attribute_value(), acc)
acc.append("\"")
acc.append(">")
for child in node.children():
rec(child, acc)
acc.append("</")
acc.append(validate_name(node.tag_name()))
acc.append(">\n")
elif isinstance(node, e_nodes.CloseStartElementNode):
pass # intended
elif isinstance(node, e_nodes.CloseEmptyElementNode):
pass # intended
elif isinstance(node, e_nodes.CloseElementNode):
pass # intended
elif isinstance(node, e_nodes.ValueNode):
acc.append(escape_value(node.children()[0].string()))
elif isinstance(node, e_nodes.AttributeNode):
pass # intended
elif isinstance(node, e_nodes.CDataSectionNode):
acc.append("<![CDATA[")
# TODO: is this correct escaping???
acc.append(escape_value(node.cdata()))
acc.append("]]>")
elif isinstance(node, e_nodes.EntityReferenceNode):
acc.append(escape_value(node.entity_reference()))
elif isinstance(node, e_nodes.ProcessingInstructionTargetNode):
acc.append(escape_value(node.processing_instruction_target()))
elif isinstance(node, e_nodes.ProcessingInstructionDataNode):
acc.append(escape_value(node.string()))
elif isinstance(node, e_nodes.TemplateInstanceNode):
raise UnexpectedElementException("TemplateInstanceNode")
elif isinstance(node, e_nodes.NormalSubstitutionNode):
sub = subs[node.index()]
if isinstance(sub, e_nodes.BXmlTypeNode):
sub = render_root_node(sub.root())
else:
sub = escape_value(sub.string())
acc.append(sub)
elif isinstance(node, e_nodes.ConditionalSubstitutionNode):
sub = subs[node.index()]
if isinstance(sub, e_nodes.BXmlTypeNode):
sub = render_root_node(sub.root())
else:
sub = escape_value(sub.string())
acc.append(sub)
elif isinstance(node, e_nodes.StreamStartNode):
pass # intended
acc = []
for c in root_node.template().children():
rec(c, acc)
return "".join(acc)
def render_root_node(root_node):
subs = []
for sub in root_node.substitutions():
if isinstance(sub, six.string_types):
raise RuntimeError('string sub?')
if sub is None:
raise RuntimeError('null sub?')
subs.append(sub)
return render_root_node_with_subs(root_node, subs)
def evtx_record_xml_view(record, cache=None):
'''
render the given record into an XML document.
Args:
record (Evtx.Record): the record to render.
Returns:
str: the rendered XML document.
'''
return render_root_node(record.root())
def evtx_chunk_xml_view(chunk):
"""
Generate XML representations of the records in an EVTX chunk.
Does not include the XML <?xml... header.
Records are ordered by chunk.records()
Args:
chunk (Evtx.Chunk): the chunk to render.
Yields:
tuple[str, Evtx.Record]: the rendered XML document and the raw record.
"""
for record in chunk.records():
record_str = evtx_record_xml_view(record)
yield record_str, record
def evtx_file_xml_view(file_header):
"""
Generate XML representations of the records in an EVTX file.
Does not include the XML <?xml... header.
Records are ordered by file_header.chunks(), and then by chunk.records()
Args:
chunk (Evtx.FileHeader): the file header to render.
Yields:
tuple[str, Evtx.Record]: the rendered XML document and the raw record.
"""
for chunk in file_header.chunks():
for record in chunk.records():
record_str = evtx_record_xml_view(record)
yield record_str, record
def evtx_template_readable_view(root_node, cache=None):
def rec(node, acc):
if isinstance(node, e_nodes.EndOfStreamNode):
pass # intended
elif isinstance(node, e_nodes.OpenStartElementNode):
acc.append("<")
acc.append(node.tag_name())
for child in node.children():
if isinstance(child, e_nodes.AttributeNode):
acc.append(" ")
acc.append(child.attribute_name().string())
acc.append("=\"")
rec(child.attribute_value(), acc)
acc.append("\"")
acc.append(">")
for child in node.children():
rec(child, acc)
acc.append("</")
acc.append(node.tag_name())
acc.append(">\n")
elif isinstance(node, e_nodes.CloseStartElementNode):
pass # intended
elif isinstance(node, e_nodes.CloseEmptyElementNode):
pass # intended
elif isinstance(node, e_nodes.CloseElementNode):
pass # intended
elif isinstance(node, e_nodes.ValueNode):
acc.append(node.children()[0].string())
elif isinstance(node, e_nodes.AttributeNode):
pass # intended
elif isinstance(node, e_nodes.CDataSectionNode):
acc.append("<![CDATA[")
acc.append(node.cdata())
acc.append("]]>")
elif isinstance(node, e_nodes.EntityReferenceNode):
acc.append(node.entity_reference())
elif isinstance(node, e_nodes.ProcessingInstructionTargetNode):
acc.append(node.processing_instruction_target())
elif isinstance(node, e_nodes.ProcessingInstructionDataNode):
acc.append(node.string())
elif isinstance(node, e_nodes.TemplateInstanceNode):
raise UnexpectedElementException("TemplateInstanceNode")
elif isinstance(node, e_nodes.NormalSubstitutionNode):
acc.append("[Normal Substitution(index={}, type={})]".format(
node.index(), node.type()))
elif isinstance(node, e_nodes.ConditionalSubstitutionNode):
acc.append("[Conditional Substitution(index={}, type={})]".format(
node.index(), node.type()))
elif isinstance(node, e_nodes.StreamStartNode):
pass # intended
acc = []
for c in root_node.template().children():
rec(c, acc)
return "".join(acc)
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