| 1 | #!/usr/bin/env python
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| 2 |
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| 3 | ## @package pyregfi
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| 4 | # Python interface to the regfi library.
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| 5 | #
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| 6 |
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| 7 | import sys
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| 8 | from pyregfi.structures import *
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| 9 |
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| 10 | import ctypes
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| 11 | import ctypes.util
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| 12 | from ctypes import c_char,c_char_p,c_int,c_uint16,c_uint32,c_bool,POINTER
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| 13 |
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| 14 | regfi = ctypes.CDLL(ctypes.util.find_library('regfi'), use_errno=True)
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| 15 |
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| 16 |
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| 17 | regfi.regfi_alloc.argtypes = [c_int, REGFI_ENCODING]
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| 18 | regfi.regfi_alloc.restype = POINTER(REGFI_FILE)
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| 19 |
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| 20 | regfi.regfi_alloc_cb.argtypes = [POINTER(REGFI_RAW_FILE), REGFI_ENCODING]
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| 21 | regfi.regfi_alloc_cb.restype = POINTER(REGFI_FILE)
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| 22 |
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| 23 | regfi.regfi_free.argtypes = [POINTER(REGFI_FILE)]
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| 24 | regfi.regfi_free.restype = None
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| 25 |
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| 26 | regfi.regfi_log_get_str.argtypes = []
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| 27 | regfi.regfi_log_get_str.restype = c_char_p
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| 28 |
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| 29 | regfi.regfi_log_set_mask.argtypes = [c_uint16]
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| 30 | regfi.regfi_log_set_mask.restype = c_bool
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| 31 |
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| 32 | regfi.regfi_free_record.argtypes = [c_void_p]
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| 33 | regfi.regfi_free_record.restype = None
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| 34 |
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| 35 | regfi.regfi_fetch_num_subkeys.argtypes = [POINTER(REGFI_NK)]
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| 36 | regfi.regfi_fetch_num_subkeys.restype = c_uint32
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| 37 |
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| 38 | regfi.regfi_fetch_num_values.argtypes = [POINTER(REGFI_NK)]
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| 39 | regfi.regfi_fetch_num_values.restype = c_uint32
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| 40 |
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| 41 | regfi.regfi_fetch_classname.argtypes = [POINTER(REGFI_FILE), POINTER(REGFI_NK)]
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| 42 | regfi.regfi_fetch_classname.restype = POINTER(REGFI_CLASSNAME)
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| 43 |
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| 44 | regfi.regfi_fetch_sk.argtypes = [POINTER(REGFI_FILE), POINTER(REGFI_NK)]
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| 45 | regfi.regfi_fetch_sk.restype = POINTER(REGFI_SK)
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| 46 |
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| 47 | regfi.regfi_fetch_data.argtypes = [POINTER(REGFI_FILE), POINTER(REGFI_VK)]
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| 48 | regfi.regfi_fetch_data.restype = POINTER(REGFI_DATA)
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| 49 |
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| 50 | regfi.regfi_find_subkey.argtypes = [POINTER(REGFI_FILE), POINTER(REGFI_NK),
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| 51 | c_char_p, POINTER(c_uint32)]
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| 52 | regfi.regfi_find_subkey.restype = c_bool
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| 53 |
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| 54 | regfi.regfi_find_value.argtypes = [POINTER(REGFI_FILE), POINTER(REGFI_NK),
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| 55 | c_char_p, POINTER(c_uint32)]
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| 56 | regfi.regfi_find_value.restype = c_bool
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| 57 |
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| 58 | regfi.regfi_get_subkey.argtypes = [POINTER(REGFI_FILE), POINTER(REGFI_NK),
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| 59 | c_uint32]
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| 60 | regfi.regfi_get_subkey.restype = POINTER(REGFI_NK)
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| 61 |
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| 62 | regfi.regfi_get_value.argtypes = [POINTER(REGFI_FILE), POINTER(REGFI_NK),
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| 63 | c_uint32]
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| 64 | regfi.regfi_get_value.restype = POINTER(REGFI_VK)
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| 65 |
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| 66 | regfi.regfi_iterator_new.argtypes = [POINTER(REGFI_FILE), REGFI_ENCODING]
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| 67 | regfi.regfi_iterator_new.restype = POINTER(REGFI_ITERATOR)
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| 68 |
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| 69 | regfi.regfi_iterator_free.argtypes = [POINTER(REGFI_ITERATOR)]
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| 70 | regfi.regfi_iterator_free.restype = None
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| 71 |
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| 72 | regfi.regfi_iterator_down.argtypes = [POINTER(REGFI_ITERATOR)]
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| 73 | regfi.regfi_iterator_down.restype = c_bool
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| 74 |
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| 75 | regfi.regfi_iterator_up.argtypes = [POINTER(REGFI_ITERATOR)]
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| 76 | regfi.regfi_iterator_up.restype = c_bool
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| 77 |
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| 78 | regfi.regfi_iterator_to_root.argtypes = [POINTER(REGFI_ITERATOR)]
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| 79 | regfi.regfi_iterator_to_root.restype = c_bool
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| 80 |
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| 81 | regfi.regfi_iterator_walk_path.argtypes = [POINTER(REGFI_ITERATOR)]
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| 82 | regfi.regfi_iterator_walk_path.restype = c_bool
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| 83 |
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| 84 | regfi.regfi_iterator_cur_key.argtypes = [POINTER(REGFI_ITERATOR)]
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| 85 | regfi.regfi_iterator_cur_key.restype = POINTER(REGFI_NK)
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| 86 |
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| 87 | regfi.regfi_iterator_first_subkey.argtypes = [POINTER(REGFI_ITERATOR)]
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| 88 | regfi.regfi_iterator_first_subkey.restype = c_bool
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| 89 |
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| 90 | regfi.regfi_iterator_cur_subkey.argtypes = [POINTER(REGFI_ITERATOR)]
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| 91 | regfi.regfi_iterator_cur_subkey.restype = POINTER(REGFI_NK)
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| 92 |
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| 93 | regfi.regfi_iterator_next_subkey.argtypes = [POINTER(REGFI_ITERATOR)]
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| 94 | regfi.regfi_iterator_next_subkey.restype = c_bool
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| 95 |
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| 96 | regfi.regfi_iterator_find_subkey.argtypes = [POINTER(REGFI_ITERATOR), c_char_p]
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| 97 | regfi.regfi_iterator_find_subkey.restype = c_bool
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| 98 |
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| 99 | regfi.regfi_iterator_first_value.argtypes = [POINTER(REGFI_ITERATOR)]
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| 100 | regfi.regfi_iterator_first_value.restype = c_bool
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| 101 |
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| 102 | regfi.regfi_iterator_cur_value.argtypes = [POINTER(REGFI_ITERATOR)]
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| 103 | regfi.regfi_iterator_cur_value.restype = POINTER(REGFI_VK)
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| 104 |
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| 105 | regfi.regfi_iterator_next_value.argtypes = [POINTER(REGFI_ITERATOR)]
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| 106 | regfi.regfi_iterator_next_value.restype = c_bool
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| 107 |
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| 108 | regfi.regfi_iterator_find_value.argtypes = [POINTER(REGFI_ITERATOR), c_char_p]
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| 109 | regfi.regfi_iterator_find_value.restype = c_bool
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| 110 |
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| 111 |
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| 112 | regfi.regfi_init.argtypes = []
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| 113 | regfi.regfi_init.restype = None
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| 114 | regfi.regfi_init()
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| 115 |
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| 116 |
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| 117 | ## Retrieves messages produced by regfi during parsing and interpretation
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| 118 | #
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| 119 | def GetLogMessages():
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| 120 | msgs = regfi.regfi_log_get_str()
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| 121 | if msgs == None:
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| 122 | return ''
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| 123 | return msgs.decode('ascii')
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| 124 |
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| 125 |
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| 126 | def _buffer2bytearray(char_pointer, length):
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| 127 | if length == 0 or char_pointer == None:
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| 128 | return None
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| 129 |
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| 130 | ret_val = bytearray(length)
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| 131 | for i in range(0,length):
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| 132 | ret_val[i] = char_pointer[i][0]
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| 133 |
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| 134 | return ret_val
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| 135 |
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| 136 |
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| 137 | def _charss2strlist(chars_pointer):
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| 138 | ret_val = []
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| 139 | i = 0
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| 140 | s = chars_pointer[i]
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| 141 | while s != None:
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| 142 | ret_val.append(s.decode('utf-8', 'replace'))
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| 143 | i += 1
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| 144 | s = chars_pointer[i]
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| 145 |
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| 146 | return ret_val
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| 147 |
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| 148 |
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| 149 | ## Abstract class which Handles memory management and proxies attribute
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| 150 | # access to base structures
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| 151 | class _StructureWrapper(object):
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| 152 | hive = None
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| 153 | base = None
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| 154 |
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| 155 | def __init__(self, hive, base):
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| 156 | self.hive = hive
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| 157 | # XXX: check for NULL here, throw an exception if so.
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| 158 | self.base = base
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| 159 |
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| 160 | def __del__(self):
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| 161 | regfi.regfi_free_record(self.base)
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| 162 | hive = None
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| 163 |
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| 164 | def __getattr__(self, name):
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| 165 | return getattr(self.base.contents, name)
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| 166 |
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| 167 | def __eq__(self, other):
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| 168 | return (type(self) == type(other)) and (self.offset == other.offset)
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| 169 |
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| 170 | def __ne__(self, other):
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| 171 | return (not self.__eq__(other))
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| 172 |
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| 173 | ## Registry key
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| 174 | class Key(_StructureWrapper):
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| 175 | pass
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| 176 |
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| 177 | class Value(_StructureWrapper):
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| 178 | pass
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| 179 |
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| 180 | ## Registry value data
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| 181 | class Data(_StructureWrapper):
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| 182 | pass
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| 183 |
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| 184 | ## Registry security record/permissions
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| 185 | class Security(_StructureWrapper):
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| 186 | pass
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| 187 |
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| 188 |
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| 189 | class _GenericList(object):
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| 190 | hive = None
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| 191 | key = None
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| 192 | length = None
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| 193 | current = None
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| 194 |
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| 195 | # implementation-specific functions
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| 196 | fetch_num = None
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| 197 | find_element = None
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| 198 | get_element = None
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| 199 | constructor = None
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| 200 |
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| 201 | def __init__(self, key):
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| 202 | self.hive = key.hive
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| 203 | # XXX: check for NULL here, throw an exception if so.
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| 204 | self.key = key
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| 205 | self.length = self.fetch_num(key.base)
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| 206 |
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| 207 | def __del__(self):
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| 208 | self.key = None
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| 209 |
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| 210 | def __len__(self):
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| 211 | return self.length
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| 212 |
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| 213 | def __getitem__(self, name):
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| 214 | index = c_uint32()
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| 215 | if isinstance(name, str):
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| 216 | name = name.encode('utf-8')
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| 217 |
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| 218 | if name != None:
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| 219 | name = create_string_buffer(bytes(name))
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| 220 |
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| 221 | if self.find_element(self.hive.file, self.key.base, name, byref(index)):
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| 222 | return self.constructor(self.hive, self.get_element(self.hive.file,
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| 223 | self.key.base,
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| 224 | index))
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| 225 | raise KeyError('')
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| 226 |
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| 227 | def get(self, name, default):
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| 228 | try:
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| 229 | return self[name]
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| 230 | except KeyError:
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| 231 | return default
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| 232 |
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| 233 | def __iter__(self):
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| 234 | self.current = 0
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| 235 | return self
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| 236 |
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| 237 | def __next__(self):
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| 238 | if self.current >= self.length:
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| 239 | raise StopIteration('')
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| 240 |
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| 241 | elem = self.get_element(self.hive.file, self.key.base,
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| 242 | c_uint32(self.current))
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| 243 | self.current += 1
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| 244 | return self.constructor(self.hive, elem)
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| 245 |
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| 246 | # For Python 2.x
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| 247 | def next(self):
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| 248 | return self.__next__()
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| 249 |
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| 250 |
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| 251 | class _SubkeyList(_GenericList):
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| 252 | fetch_num = regfi.regfi_fetch_num_subkeys
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| 253 | find_element = regfi.regfi_find_subkey
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| 254 | get_element = regfi.regfi_get_subkey
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| 255 |
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| 256 |
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| 257 | class _ValueList(_GenericList):
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| 258 | fetch_num = regfi.regfi_fetch_num_values
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| 259 | find_element = regfi.regfi_find_value
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| 260 | get_element = regfi.regfi_get_value
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| 261 |
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| 262 |
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| 263 | class Key(_StructureWrapper):
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| 264 | values = None
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| 265 | subkeys = None
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| 266 |
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| 267 | def __init__(self, hive, base):
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| 268 | super(Key, self).__init__(hive, base)
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| 269 | self.values = _ValueList(self)
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| 270 | self.subkeys = _SubkeyList(self)
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| 271 |
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| 272 | def __getattr__(self, name):
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| 273 | ret_val = super(Key, self).__getattr__(name)
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| 274 |
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| 275 | if name == "name":
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| 276 | if ret_val == None:
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| 277 | ret_val = self.name_raw
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| 278 | else:
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| 279 | ret_val = ret_val.decode('utf-8', 'replace')
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| 280 |
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| 281 | elif name == "name_raw":
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| 282 | length = super(Key, self).__getattr__('name_length')
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| 283 | ret_val = _buffer2bytearray(ret_val, length)
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| 284 |
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| 285 | return ret_val
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| 286 |
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| 287 |
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| 288 | def fetch_security(self):
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| 289 | return Security(self.hive,
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| 290 | regfi.regfi_fetch_sk(self.hive.file, self.base))
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| 291 |
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| 292 |
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| 293 | ## Registry value (metadata)
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| 294 | #
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| 295 | # These represent registry values (@ref REGFI_VK records) and provide
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| 296 | # access to their associated data.
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| 297 | #
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| 298 | class Value(_StructureWrapper):
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| 299 | def __getattr__(self, name):
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| 300 | ret_val = None
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| 301 | if name == "data":
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| 302 | data_p = regfi.regfi_fetch_data(self.hive.file, self.base)
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| 303 | try:
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| 304 | data_struct = data_p.contents
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| 305 | except Exception:
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| 306 | return None
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| 307 |
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| 308 | if data_struct.interpreted_size == 0:
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| 309 | ret_val = None
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| 310 | elif data_struct.type in (REG_SZ, REG_EXPAND_SZ, REG_LINK):
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| 311 | # Unicode strings
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| 312 | ret_val = data_struct.interpreted.string.decode('utf-8', 'replace')
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| 313 | elif data_struct.type in (REG_DWORD, REG_DWORD_BE):
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| 314 | # 32 bit integers
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| 315 | ret_val = data_struct.interpreted.dword
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| 316 | elif data_struct.type == REG_QWORD:
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| 317 | # 64 bit integers
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| 318 | ret_val = data_struct.interpreted.qword
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| 319 | elif data_struct.type == REG_MULTI_SZ:
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| 320 | ret_val = _charss2strlist(data_struct.interpreted.multiple_string)
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| 321 | elif data_struct.type in (REG_NONE, REG_RESOURCE_LIST,
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| 322 | REG_FULL_RESOURCE_DESCRIPTOR,
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| 323 | REG_RESOURCE_REQUIREMENTS_LIST,
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| 324 | REG_BINARY):
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| 325 | ret_val = _buffer2bytearray(data_struct.interpreted.none,
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| 326 | data_struct.interpreted_size)
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| 327 |
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| 328 | regfi.regfi_free_record(data_p)
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| 329 |
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| 330 | elif name == "data_raw":
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| 331 | # XXX: should we load the data without interpretation instead?
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| 332 | data_p = regfi.regfi_fetch_data(self.hive.file, self.base)
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| 333 | try:
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| 334 | data_struct = data_p.contents
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| 335 | except Exception:
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| 336 | return None
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| 337 |
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| 338 | ret_val = _buffer2bytearray(data_struct.raw,
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| 339 | data_struct.size)
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| 340 | regfi.regfi_free_record(data_p)
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| 341 |
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| 342 | else:
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| 343 | ret_val = super(Value, self).__getattr__(name)
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| 344 | if name == "name":
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| 345 | if ret_val == None:
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| 346 | ret_val = self.name_raw
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| 347 | else:
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| 348 | ret_val = ret_val.decode('utf-8', 'replace')
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| 349 |
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| 350 | elif name == "name_raw":
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| 351 | length = super(Value, self).__getattr__('name_length')
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| 352 | ret_val = _buffer2bytearray(ret_val, length)
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| 353 |
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| 354 | return ret_val
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| 355 |
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| 356 |
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| 357 | # Avoids chicken/egg class definitions.
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| 358 | # Also makes for convenient code reuse in these lists' parent classes.
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| 359 | _SubkeyList.constructor = Key
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| 360 | _ValueList.constructor = Value
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| 361 |
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| 362 |
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| 363 |
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| 364 | ## Represents a single registry hive (file)
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| 365 | #
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| 366 | class Hive():
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| 367 | file = None
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| 368 | raw_file = None
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| 369 |
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| 370 | def __init__(self, fh):
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| 371 | # The fileno method may not exist, or it may throw an exception
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| 372 | # when called if the file isn't backed with a descriptor.
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| 373 | try:
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| 374 | if hasattr(fh, 'fileno'):
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| 375 | self.file = regfi.regfi_alloc(fh.fileno(), REGFI_ENCODING_UTF8)
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| 376 | return
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| 377 | except:
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| 378 | pass
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| 379 |
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| 380 | self.raw_file = structures.REGFI_RAW_FILE()
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| 381 | self.raw_file.fh = fh
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| 382 | self.raw_file.seek = seek_cb_type(self.raw_file.cb_seek)
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| 383 | self.raw_file.read = read_cb_type(self.raw_file.cb_read)
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| 384 | self.file = regfi.regfi_alloc_cb(self.raw_file, REGFI_ENCODING_UTF8)
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| 385 |
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| 386 | def __getattr__(self, name):
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| 387 | return getattr(self.file.contents, name)
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| 388 |
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| 389 | def __del__(self):
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| 390 | regfi.regfi_free(self.file)
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| 391 | if self.raw_file != None:
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| 392 | self.raw_file = None
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| 393 |
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| 394 | def __iter__(self):
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| 395 | return HiveIterator(self)
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| 396 |
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| 397 | ## Creates a @ref HiveIterator initialized at the specified path in
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| 398 | # the hive.
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| 399 | #
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| 400 | # Raises an Exception if the path could not be found/traversed.
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| 401 | def subtree(self, path):
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| 402 | hi = HiveIterator(self)
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| 403 | hi.descend(path)
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| 404 | return hi
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| 405 |
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| 406 |
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| 407 | ## A special purpose iterator for registry hives
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| 408 | #
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| 409 | # Iterating over an object of this type causes all keys in a specific
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| 410 | # hive subtree to be returned in a depth-first manner. These iterators
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| 411 | # are typically created using the @ref Hive.subtree() function on a @ref Hive
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| 412 | # object.
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| 413 | #
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| 414 | # HiveIterators can also be used to manually traverse up and down a
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| 415 | # registry hive as they retain information about the current position in
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| 416 | # the hive, along with which iteration state for subkeys and values for
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| 417 | # every parent key. See the @ref up and @ref down methods for more
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| 418 | # information.
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| 419 | class HiveIterator():
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| 420 | hive = None
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| 421 | iter = None
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| 422 | iteration_root = None
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| 423 |
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| 424 | def __init__(self, hive):
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| 425 | self.iter = regfi.regfi_iterator_new(hive.file, REGFI_ENCODING_UTF8)
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| 426 | if self.iter == None:
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| 427 | raise Exception("Could not create iterator. Current log:\n"
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| 428 | + GetLogMessages())
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| 429 | self.hive = hive
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| 430 |
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| 431 | def __getattr__(self, name):
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| 432 | return getattr(self.file.contents, name)
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| 433 |
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| 434 | def __del__(self):
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| 435 | regfi.regfi_iterator_free(self.iter)
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| 436 |
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| 437 | def __iter__(self):
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| 438 | self.iteration_root = None
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| 439 | return self
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| 440 |
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| 441 | def __next__(self):
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| 442 | if self.iteration_root == None:
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| 443 | self.iteration_root = self.current_key()
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| 444 | elif not regfi.regfi_iterator_down(self.iter):
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| 445 | up_ret = regfi.regfi_iterator_up(self.iter)
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| 446 | while (up_ret and
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| 447 | not regfi.regfi_iterator_next_subkey(self.iter)):
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| 448 | if self.iteration_root == self.current_key():
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| 449 | self.iteration_root = None
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| 450 | raise StopIteration('')
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| 451 | up_ret = regfi.regfi_iterator_up(self.iter)
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| 452 |
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| 453 | if not up_ret:
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| 454 | raise StopIteration('')
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| 455 |
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| 456 | # XXX: Use non-generic exception
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| 457 | if not regfi.regfi_iterator_down(self.iter):
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| 458 | raise Exception('Error traversing iterator downward.'+
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| 459 | ' Current log:\n'+ GetLogMessages())
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| 460 |
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| 461 | regfi.regfi_iterator_first_subkey(self.iter)
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| 462 | return self.current_key()
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| 463 |
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| 464 | # For Python 2.x
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| 465 | def next(self):
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| 466 | return self.__next__()
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| 467 |
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| 468 | def down(self):
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| 469 | pass
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| 470 |
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| 471 | def up(self):
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| 472 | pass
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| 473 |
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| 474 | def descend(self, path):
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| 475 | #set up generator
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| 476 | cpath = (bytes(p,'ascii') for p in path)
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| 477 |
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| 478 | # evaluate generator and create char* array
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| 479 | apath = (c_char_p*len(path))(*cpath)
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| 480 |
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| 481 | # XXX: Use non-generic exception
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| 482 | if not regfi.regfi_iterator_walk_path(self.iter,apath):
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| 483 | raise Exception('Could not locate path.\n'+GetLogMessages())
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| 484 |
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| 485 | def current_key(self):
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| 486 | return Key(self.hive, regfi.regfi_iterator_cur_key(self.iter))
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| 487 |
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| 488 | #XXX Add subkey/value search accessor functions (?)
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