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ParseHandlers.py
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ParseHandlers.py
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'''
NFI -- Silensec's Nyuki Forensics Investigator
Copyright (C) 2014 George Nicolaou (george[at]silensec[dot]com)
Silensec Ltd.
This file is part of Nyuki Forensics Investigator (NFI).
NFI is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
NFI is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with NFI. If not, see <http://www.gnu.org/licenses/>.
'''
import ExtractStore, SQLite3Initializer
import xml.etree.ElementTree as ET
import re,struct, itertools
from IMiscSource import FieldType, ReadTypeXML, BinaryRead, BinaryClass
store_types = {
FieldType.TYPE_DATE: ExtractStore.TYPE_DATE,
FieldType.TYPE_STR: ExtractStore.TYPE_STRING,
FieldType.TYPE_INT: ExtractStore.TYPE_STRING,
FieldType.TYPE_DATA: ExtractStore.TYPE_DATA,
}
def _parse_xml_knownfields( known_fields, root, print_queue ):
items = []
for known_field in known_fields:
if known_field.fieldtype == FieldType.TYPE_CONTAINER:
if len(known_field.contents) == 0: continue
if type(known_field.xml_path) != list:
xpaths = [known_field.xml_path]
else:
xpaths = known_field.xml_path
for xpath in xpaths:
node = root.find( xpath )
if node == None:
continue
#item = ExtractStore.MiscItem(item_type=ExtractStore.TYPE_MULTI)
for child in node.getchildren():
imult = _parse_xml_knownfields( known_field.contents, child,
print_queue )
if len(imult) == 0: continue
child_item = ExtractStore.MiscItem(
item_type=ExtractStore.TYPE_MULTI,
item_contents=imult )
#item.add_item( child_item )
items.append( child_item )
#items.append(item)
elif known_field.fieldtype == FieldType.TYPE_ARRAY:
if len(known_field.contents) == 0: continue
if type(known_field.xml_path) != list:
xpaths = [known_field.xml_path]
else:
xpaths = known_field.xml_path
for xpath in xpaths:
nodes = root.findall( xpath )
#item = ExtractStore.MiscItem(item_type=ExtractStore.TYPE_MULTI)
for node in nodes:
imult = _parse_xml_knownfields( known_field.contents, node,
print_queue )
child_item = ExtractStore.MiscItem(
item_type=ExtractStore.TYPE_MULTI,
item_contents=imult )
#item.add_item( child_item )
items.append( child_item )
#items.append(item)
else:
if known_field.read_type == ReadTypeXML.READ_TEXT:
if type(known_field.xml_path) != list:
xpaths = [known_field.xml_path]
else:
xpaths = known_field.xml_path
for xpath in xpaths:
value = root.find( xpath ).text
if known_field.converter != None:
value = known_field.converter(value)
if value == None:
value = "N/A"
items.append(
ExtractStore.MiscItem(
store_types[known_field.fieldtype],
known_field.description, value,
item_name=known_field.internal_name
)
)
elif known_field.read_type == ReadTypeXML.READ_ATTR:
if type(known_field.xml_path) != list:
xpaths = [known_field.xml_path]
else:
xpaths = known_field.xml_path
for xpath in xpaths:
value = None
found_item = root.find( known_field.xml_path )
if found_item != None:
tags = found_item.items()
for tag in tags:
if tag[0] == known_field.attr:
value = tag[1]
break
if known_field.converter != None and value != None:
value = known_field.converter(value)
if value == None:
value = "N/A"
items.append(
ExtractStore.MiscItem(
store_types[known_field.fieldtype],
known_field.description, value,
item_name = known_field.internal_name
)
)
else:
print "Not implemented read method"
return items
def parse_xml( filename, filepath, known_info, print_queue, settings=None ):
try:
root = ET.parse(filepath)
except:
print "Error Parsing XML file"
return None
subsections = []
for descr, known_fields in known_info.knownfields.iteritems():
print_queue.put("\t[XML Parsing] Scanning: " + descr.label )
items = _parse_xml_knownfields( known_fields, root, print_queue )
subsection = ExtractStore.MiscSubSection( descr, items )
subsections.append( subsection )
return subsections
def _parse_regex_knownfields( known_fields, file_contents, print_queue ):
items = []
for known_field in known_fields:
if known_field.field_type == FieldType.TYPE_CONTAINER:
if len(known_field.contents) == 0: continue
#Get all sub-contents of all items. Eg: network={ <this content> }
item_contents = re.findall( known_field.fieldregex, file_contents )
#For every content item of an entry
for content in item_contents:
if type(content) == tuple:
content = content[0]
item = ExtractStore.MiscItem(item_type=ExtractStore.TYPE_MULTI,
item_name = known_field.internal_name )
#Recurse and give the known_fields of this entry that are the
#same for every entry
item.add_multiple_items( _parse_regex_knownfields(
known_field.contents, content,
print_queue ) )
items.append(item)
else: #We read everything else as strings
match = re.search( known_field.fieldregex, file_contents )
if match == None:
value = "N/A"
else:
value = match.group(1)
items.append(
ExtractStore.MiscItem(
store_types[known_field.field_type],
known_field.description,
value,
item_name = known_field.internal_name
)
)
return items
def parse_regex( filename, filepath, known_info, print_queue, settings=None ):
file_handle = open( filepath, "rb")
file_contents = file_handle.read()
file_handle.close()
subsections = []
for descr, known_fields in known_info.knownfields.iteritems():
print_queue.put("\t[Regex Parsing] Scanning: " + descr.label )
items = _parse_regex_knownfields( known_fields, file_contents,
print_queue )
subsection = ExtractStore.MiscSubSection( descr, items )
subsections.append(subsection)
return subsections
def parse_keyval( filename, filepath, known_info, section, print_queue, settings=None ):
return
def parse_ascii():
return
primitive_info = {
BinaryRead.BYTE : {"fmt": 'b', "size": 1 },
BinaryRead.SHORT: {"fmt": 'h', "size": 2 },
BinaryRead.INTEGER: { "fmt": 'i', "size": 4 }
}
def _parse_binary_knownfields( known_fields, file_contents, print_queue ):
items = []
temp_store = {}
cur = 0 #cursor
for field in known_fields:
': :type field IMiscSource.KnownFieldBin'
#Reading actual value (BinaryRead)
if field.binary_read in primitive_info:
info = primitive_info[field.binary_read]
val = struct.unpack(field.endianess+info['fmt'],
file_contents[cur:cur+info['size']])
if type(val) == tuple:
val = val[0]
else:
val = None
cur += info['size']
elif field.binary_read == BinaryRead.ASCII_STRING:
tmpval = itertools.takewhile( lambda c: c != '\x00',
file_contents[cur:] )
cur += len(tmpval) + 1 #we skip the null byte too
val = ''.join(tmpval)
elif field.binary_read == BinaryRead.UTF16_STRING:
#XXX should find a more pythonic way to do this...
tmpval = []
for c in file_contents[cur:]:
if c == '\x00' and tmpval[-1:] == '\x00': break
tmpval.append(c)
tmpval = tmpval[:-1] #remove last null
cur += len(tmpval) + 2
val = ''.join(tmpval).decode("UTF-16")
elif field.binary_read == BinaryRead.EOF:
val = file_contents[cur:]
elif callable(field.binary_read):
(val,consume) = field.binary_read(temp_store,cur,file_contents)
cur += consume
elif type(field.binary_read) == int and field.binary_read > 0:
val = file_contents[cur:cur+field.binary_read]
cur += field.binary_read
elif type(field.binary_read) == str:
if field.binary_read in temp_store:
size = temp_store[field.binary_read]
if type(size) == int:
val = file_contents[cur:cur+size]
cur += size
else:
print "Error: De-referencing value is not int"
else:
print "Error: Invalid BinaryRead value"
continue
#Interpreting value
field_type = None
if field.binary_class == BinaryClass.PRIMITIVE:
field_type = FieldType.TYPE_INT
elif field.binary_class in [ BinaryClass.ENUMERATION,
BinaryClass.FLAG_NUMERICAL]:
if field.converter != None and type(field.converter) == dict:
if val in field.converter:
val = field.converter[val]
field_type = FieldType.TYPE_STR
elif field.binary_class == BinaryClass.FLAG_BITWISE:
if type(val) == int and type(field.converter) == dict:
tmpstr = ""
for flag,descr in field.converter.iteritems():
if type(flag) == int:
if flag & val != 0:
tmpstr += descr + " + "
if len(tmpstr) != 0:
val = tmpstr[:-3] #remove " + "
field_type = FieldType.TYPE_STR
elif field.binary_class == BinaryClass.ASCII_STRING:
field_type = FieldType.TYPE_STR
elif field.binary_class == BinaryClass.UTF8:
val = val.decode("UTF-8")
field_type = FieldType.TYPE_STR
elif field.binary_class == BinaryClass.UTF16:
val = val.decode("UTF-16")
field_type = FieldType.TYPE_STR
elif field.binary_class == BinaryClass.DATE:
field_type = FieldType.TYPE_DATE
elif field.binary_class == BinaryClass.CONSUME:
field_type == None
else:
print "Error: Invalid BinaryClass value"
continue
if field.converter != None:
if field.binary_class not in [ BinaryClass.FLAG_BITWISE,
BinaryClass.FLAG_NUMERICAL,
BinaryClass.ENUMERATION ]:
val = field.converter(val)
temp_store[field.field_name] = val
if field.binary_class != BinaryClass.CONSUME:
item = ExtractStore.MiscItem( field_type, field.description, val,
item_name=field.field_name )
items.append(item)
return items
def parse_binary( filename, filepath, known_info, print_queue, settings=None ):
file_handle = open( filepath, "rb" )
file_contents = file_handle.read()
file_handle.close()
subsections = []
for descr, known_fields in known_info.knownfields.iteritems():
print_queue.put("\t[Binary Parsing] Scanning: " + descr.label )
items = _parse_binary_knownfields( known_fields, file_contents,
print_queue )
subsection = ExtractStore.MiscSubSection( descr, items )
subsections.append( subsection )
return subsections
"""
SQLite Parser -----------------------------------------------------------------
"""
import StringIO, sqlite3, tempfile, shutil,os
def _parse_sqlite_knownfield( known_fields, cursor, print_queue, contents=None ):
items = []
for known_field in known_fields:
if known_field.field_type == FieldType.TYPE_ARRAY:
#This is an array, we are expecting multiple rows
try:
res_obj = cursor.execute(known_field.sql)
except sqlite3.OperationalError as e:
print_queue.put("\t\t[SQLite3 Parsing]: Error: " + e.message )
continue
except:
print_queue.put("\t\t[SQLite3 Parsing] Error: Bad SQL")
continue
res = res_obj.fetchall()
for row in res:
row_items = _parse_sqlite_knownfield( known_field.contents,
cursor, print_queue, row )
tbl_item = ExtractStore.MiscItem(
item_type=ExtractStore.TYPE_MULTI)
tbl_item.add_multiple_items(row_items)
items.append(tbl_item)
elif known_field.sql == None:
#This is a row element, we are expecting sql to be null
if known_field.internal_name in contents:
if known_field.converter != None:
contents[known_field.internal_name] = known_field.converter(
contents[known_field.internal_name] )
item = ExtractStore.MiscItem(
store_types[known_field.field_type],
known_field.description,
contents[known_field.internal_name],
item_name=known_field.internal_name )
items.append(item)
else:
try:
res_obj = cursor.execute(known_field.sql)
res = res_obj.fetchone()
if res == None:
value = "N/A"
elif len(res) == 0:
value = "N/A"
elif len(res) != 1:
print_queue.put("\t\t[SQLite3 Parsing] Result Unexpected" + str(res))
value = "N/A"
else:
value = res.values()[0]
if known_field.converter != None:
value = known_field.converter(value)
items.append( ExtractStore.MiscItem(
store_types[known_field.field_type],
known_field.description, value,
item_name=known_field.internal_name ) )
except:
print_queue.put("\t\t[SQLite3 Parsing] Error: Bad SQL")
return items
def dict_factory(cursor, row):
d = {}
for idx, col in enumerate(cursor.description):
if type(row[idx]) == buffer:
d[col[0]] = StringIO.StringIO(row[idx])
else:
d[col[0]] = row[idx]
return d
def parse_sqlite( filename, filepath, known_info, print_queue, settings=None ):
tmpdir = tempfile.gettempdir()
tmp_filepath = os.path.join( tmpdir, filename )
print_queue.put( "\t[SQLite3 Parsing] Copying file: {} > {}".format(
filepath, tmp_filepath ) )
shutil.copy2( filepath, tmp_filepath )
conn = sqlite3.connect(tmp_filepath)
SQLite3Initializer.init_android(conn)
conn.row_factory = dict_factory
cur = conn.cursor()
subsections = []
for descr, known_fields in known_info.knownfields.iteritems():
items = _parse_sqlite_knownfield( known_fields, cur, print_queue )
subsection = ExtractStore.MiscSubSection( descr, items )
subsections.append( subsection )
return subsections