[204] | 1 | #!/usr/bin/env python |
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| 2 | |
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[210] | 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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[204] | 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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[207] | 12 | from ctypes import c_char,c_char_p,c_int,c_uint16,c_uint32,c_bool,POINTER |
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[204] | 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] |
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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)] |
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| 21 | regfi.regfi_alloc_cb.restype = POINTER(REGFI_FILE) |
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| 22 | |
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[205] | 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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[204] | 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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[205] | 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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[207] | 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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[206] | 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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[207] | 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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[205] | 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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[204] | 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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[210] | 117 | ## Retrieves messages produced by regfi during parsing and interpretation |
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| 118 | # |
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[205] | 119 | def GetLogMessages(): |
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[206] | 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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[207] | 123 | return msgs.decode('ascii') |
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[205] | 124 | |
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| 125 | |
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[208] | 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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[209] | 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')) |
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| 143 | i += 1 |
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| 144 | s = chars_pointer[i] |
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[208] | 145 | |
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[209] | 146 | return ret_val |
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[208] | 147 | |
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[210] | 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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[206] | 151 | class _StructureWrapper(): |
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[210] | 152 | |
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[207] | 153 | hive = None |
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[206] | 154 | base = None |
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| 155 | |
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[207] | 156 | def __init__(self, hive, base): |
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| 157 | self.hive = hive |
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[206] | 158 | # XXX: check for NULL here, throw an exception if so. |
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| 159 | self.base = base |
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| 160 | |
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| 161 | def __del__(self): |
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| 162 | regfi.regfi_free_record(self.base) |
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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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[210] | 173 | ## Registry key |
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[208] | 174 | class Key(_StructureWrapper): |
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| 175 | pass |
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| 176 | |
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[206] | 177 | class Value(_StructureWrapper): |
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| 178 | pass |
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| 179 | |
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[210] | 180 | ## Registry value data |
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[206] | 181 | class Data(_StructureWrapper): |
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| 182 | pass |
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| 183 | |
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[210] | 184 | ## Registry security record/permissions |
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[206] | 185 | class Security(_StructureWrapper): |
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| 186 | pass |
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| 187 | |
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[207] | 188 | |
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[208] | 189 | class _GenericList(): |
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[207] | 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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[208] | 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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[207] | 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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[208] | 205 | self.length = self.fetch_num(key.base) |
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[207] | 206 | |
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| 207 | def __len__(self): |
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| 208 | return self.length |
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| 209 | |
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| 210 | def __getitem__(self, name): |
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| 211 | index = c_uint32() |
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[208] | 212 | if isinstance(name, str): |
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| 213 | name = name.encode('utf-8') |
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| 214 | |
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[209] | 215 | if name != None: |
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| 216 | name = create_string_buffer(bytes(name)) |
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| 217 | |
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| 218 | if self.find_element(self.hive.file, self.key.base, name, byref(index)): |
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[208] | 219 | return self.constructor(self.hive, self.get_element(self.hive.file, |
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| 220 | self.key.base, |
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| 221 | index)) |
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[207] | 222 | raise KeyError('') |
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| 223 | |
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[209] | 224 | def get(self, name, default): |
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| 225 | try: |
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| 226 | return self[name] |
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| 227 | except KeyError: |
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| 228 | return default |
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| 229 | |
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[207] | 230 | def __iter__(self): |
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| 231 | self.current = 0 |
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| 232 | return self |
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| 233 | |
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| 234 | def __next__(self): |
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| 235 | if self.current >= self.length: |
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| 236 | raise StopIteration('') |
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| 237 | |
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[208] | 238 | elem = self.get_element(self.hive.file, self.key.base, |
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| 239 | c_uint32(self.current)) |
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[207] | 240 | self.current += 1 |
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[209] | 241 | return self.constructor(self.hive, elem) |
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[207] | 242 | |
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| 243 | |
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[208] | 244 | class _SubkeyList(_GenericList): |
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| 245 | fetch_num = regfi.regfi_fetch_num_subkeys |
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| 246 | find_element = regfi.regfi_find_subkey |
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| 247 | get_element = regfi.regfi_get_subkey |
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| 248 | |
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| 249 | |
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| 250 | class _ValueList(_GenericList): |
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| 251 | fetch_num = regfi.regfi_fetch_num_values |
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| 252 | find_element = regfi.regfi_find_value |
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| 253 | get_element = regfi.regfi_get_value |
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| 254 | |
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| 255 | |
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[207] | 256 | class Key(_StructureWrapper): |
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| 257 | values = None |
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[208] | 258 | subkeys = None |
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[207] | 259 | |
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| 260 | def __init__(self, hive, base): |
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| 261 | super(Key, self).__init__(hive, base) |
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| 262 | self.values = _ValueList(self) |
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[208] | 263 | self.subkeys = _SubkeyList(self) |
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[207] | 264 | |
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[208] | 265 | def __getattr__(self, name): |
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| 266 | ret_val = super(Key, self).__getattr__(name) |
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| 267 | |
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| 268 | if name == "name": |
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[209] | 269 | if ret_val == None: |
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| 270 | ret_val = self.name_raw |
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| 271 | else: |
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| 272 | ret_val = ret_val.decode('utf-8') |
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| 273 | |
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[208] | 274 | elif name == "name_raw": |
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| 275 | length = super(Key, self).__getattr__('name_length') |
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| 276 | ret_val = _buffer2bytearray(ret_val, length) |
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| 277 | |
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| 278 | return ret_val |
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| 279 | |
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| 280 | |
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[207] | 281 | def fetch_security(self): |
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| 282 | return Security(self.hive, |
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| 283 | regfi.regfi_fetch_sk(self.hive.file, self.base)) |
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| 284 | |
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| 285 | |
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[210] | 286 | ## Registry value (metadata) |
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| 287 | # |
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| 288 | # These represent registry values (@ref REGFI_VK records) and provide |
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| 289 | # access to their associated data. |
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| 290 | # |
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[208] | 291 | class Value(_StructureWrapper): |
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| 292 | def __getattr__(self, name): |
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[209] | 293 | ret_val = None |
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| 294 | if name == "data": |
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| 295 | data_p = regfi.regfi_fetch_data(self.hive.file, self.base) |
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| 296 | try: |
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| 297 | data_struct = data_p.contents |
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| 298 | except Exception: |
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| 299 | return None |
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[208] | 300 | |
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[209] | 301 | if data_struct.interpreted_size == 0: |
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| 302 | ret_val = None |
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| 303 | elif data_struct.type in (REG_SZ, REG_EXPAND_SZ, REG_LINK): |
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| 304 | # Unicode strings |
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| 305 | ret_val = data_struct.interpreted.string.decode('utf-8') |
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| 306 | elif data_struct.type in (REG_DWORD, REG_DWORD_BE): |
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| 307 | # 32 bit integers |
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| 308 | ret_val = data_struct.interpreted.dword |
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| 309 | elif data_struct.type == REG_QWORD: |
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| 310 | # 64 bit integers |
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| 311 | ret_val = data_struct.interpreted.qword |
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| 312 | elif data_struct.type == REG_MULTI_SZ: |
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| 313 | ret_val = _charss2strlist(data_struct.interpreted.multiple_string) |
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| 314 | elif data_struct.type in (REG_NONE, REG_RESOURCE_LIST, |
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| 315 | REG_FULL_RESOURCE_DESCRIPTOR, |
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| 316 | REG_RESOURCE_REQUIREMENTS_LIST, |
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| 317 | REG_BINARY): |
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| 318 | ret_val = _buffer2bytearray(data_struct.interpreted.none, |
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| 319 | data_struct.interpreted_size) |
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| 320 | |
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| 321 | regfi.regfi_free_record(data_p) |
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| 322 | |
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| 323 | elif name == "data_raw": |
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| 324 | # XXX: should we load the data without interpretation instead? |
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| 325 | data_p = regfi.regfi_fetch_data(self.hive.file, self.base) |
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| 326 | try: |
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| 327 | data_struct = data_p.contents |
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| 328 | except Exception: |
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| 329 | return None |
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| 330 | |
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| 331 | ret_val = _buffer2bytearray(data_struct.raw, |
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| 332 | data_struct.size) |
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| 333 | regfi.regfi_free_record(data_p) |
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| 334 | |
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| 335 | else: |
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| 336 | ret_val = super(Value, self).__getattr__(name) |
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| 337 | if name == "name": |
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| 338 | if ret_val == None: |
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| 339 | ret_val = self.name_raw |
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| 340 | else: |
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| 341 | ret_val = ret_val.decode('utf-8') |
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| 342 | |
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| 343 | elif name == "name_raw": |
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| 344 | length = super(Value, self).__getattr__('name_length') |
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| 345 | ret_val = _buffer2bytearray(ret_val, length) |
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| 346 | |
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[208] | 347 | return ret_val |
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| 348 | |
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| 349 | |
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| 350 | # Avoids chicken/egg class definitions. |
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| 351 | # Also makes for convenient code reuse in these lists' parent classes. |
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| 352 | _SubkeyList.constructor = Key |
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| 353 | _ValueList.constructor = Value |
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| 354 | |
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| 355 | |
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| 356 | |
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[210] | 357 | ## Represents a single registry hive (file) |
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| 358 | # |
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| 359 | class Hive(): |
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[204] | 360 | file = None |
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| 361 | raw_file = None |
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| 362 | |
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| 363 | def __init__(self, fh): |
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[209] | 364 | # The fileno method may not exist, or it may throw an exception |
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[205] | 365 | # when called if the file isn't backed with a descriptor. |
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| 366 | try: |
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| 367 | if hasattr(fh, 'fileno'): |
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| 368 | self.file = regfi.regfi_alloc(fh.fileno()) |
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| 369 | return |
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| 370 | except: |
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| 371 | pass |
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[204] | 372 | |
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[205] | 373 | self.raw_file = structures.REGFI_RAW_FILE() |
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| 374 | self.raw_file.fh = fh |
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| 375 | self.raw_file.seek = seek_cb_type(self.raw_file.cb_seek) |
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| 376 | self.raw_file.read = read_cb_type(self.raw_file.cb_read) |
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| 377 | self.file = regfi.regfi_alloc_cb(self.raw_file) |
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[204] | 378 | |
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| 379 | def __getattr__(self, name): |
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| 380 | return getattr(self.file.contents, name) |
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[205] | 381 | |
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[210] | 382 | def __del__(self): |
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[205] | 383 | regfi.regfi_free(self.file) |
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| 384 | if self.raw_file != None: |
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| 385 | regfi.regfi_free(self.file) |
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| 386 | |
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[204] | 387 | |
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[205] | 388 | def __iter__(self): |
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| 389 | return HiveIterator(self) |
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[204] | 390 | |
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[210] | 391 | ## Creates a @ref HiveIterator initialized at the specified path in |
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| 392 | # the hive. |
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| 393 | # |
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| 394 | # Raises an Exception if the path could not be found/traversed. |
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[206] | 395 | def subtree(self, path): |
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| 396 | hi = HiveIterator(self) |
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| 397 | hi.descend(path) |
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| 398 | return hi |
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[205] | 399 | |
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[206] | 400 | |
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[210] | 401 | ## A special purpose iterator for registry hives |
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| 402 | # |
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| 403 | # Iterating over an object of this type causes all keys in a specific |
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| 404 | # hive subtree to be returned in a depth-first manner. These iterators |
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| 405 | # are typically created using the @ref Hive.subtree() function on a @ref Hive |
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| 406 | # object. |
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| 407 | # |
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| 408 | # HiveIterators can also be used to manually traverse up and down a |
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| 409 | # registry hive as they retain information about the current position in |
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| 410 | # the hive, along with which iteration state for subkeys and values for |
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| 411 | # every parent key. See the @ref up and @ref down methods for more |
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| 412 | # information. |
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[205] | 413 | class HiveIterator(): |
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| 414 | hive = None |
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| 415 | iter = None |
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[206] | 416 | iteration_root = None |
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[205] | 417 | |
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| 418 | def __init__(self, hive): |
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| 419 | # REGFI_ENCODING_UTF8==1 |
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| 420 | self.iter = regfi.regfi_iterator_new(hive.file, 1) |
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| 421 | if self.iter == None: |
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| 422 | raise Exception("Could not create iterator. Current log:\n" |
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| 423 | + GetLogMessages()) |
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| 424 | self.hive = hive |
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| 425 | |
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| 426 | def __getattr__(self, name): |
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| 427 | return getattr(self.file.contents, name) |
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| 428 | |
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| 429 | def __del__(self): |
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| 430 | regfi.regfi_iterator_free(self.iter) |
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| 431 | |
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| 432 | def __iter__(self): |
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[206] | 433 | self.iteration_root = None |
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[205] | 434 | return self |
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| 435 | |
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| 436 | def __next__(self): |
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[206] | 437 | if self.iteration_root == None: |
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| 438 | self.iteration_root = self.current_key() |
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[205] | 439 | elif not regfi.regfi_iterator_down(self.iter): |
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| 440 | up_ret = regfi.regfi_iterator_up(self.iter) |
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[206] | 441 | while (up_ret and |
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| 442 | not regfi.regfi_iterator_next_subkey(self.iter)): |
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| 443 | if self.iteration_root == self.current_key(): |
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| 444 | self.iteration_root = None |
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| 445 | raise StopIteration('') |
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[205] | 446 | up_ret = regfi.regfi_iterator_up(self.iter) |
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| 447 | |
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| 448 | if not up_ret: |
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| 449 | raise StopIteration('') |
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| 450 | |
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[210] | 451 | # XXX: Use non-generic exception |
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[205] | 452 | if not regfi.regfi_iterator_down(self.iter): |
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| 453 | raise Exception('Error traversing iterator downward.'+ |
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| 454 | ' Current log:\n'+ GetLogMessages()) |
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| 455 | |
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| 456 | regfi.regfi_iterator_first_subkey(self.iter) |
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[206] | 457 | return self.current_key() |
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[205] | 458 | |
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[206] | 459 | def down(self): |
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| 460 | pass |
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| 461 | |
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| 462 | def up(self): |
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| 463 | pass |
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| 464 | |
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| 465 | def descend(self, path): |
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| 466 | #set up generator |
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| 467 | cpath = (bytes(p,'ascii') for p in path) |
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| 468 | |
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| 469 | # evaluate generator and create char* array |
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| 470 | apath = (c_char_p*len(path))(*cpath) |
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| 471 | |
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[210] | 472 | # XXX: Use non-generic exception |
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[206] | 473 | if not regfi.regfi_iterator_walk_path(self.iter,apath): |
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| 474 | raise Exception('Could not locate path.\n'+GetLogMessages()) |
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| 475 | |
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| 476 | def current_key(self): |
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[207] | 477 | return Key(self.hive, regfi.regfi_iterator_cur_key(self.iter)) |
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[210] | 478 | |
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| 479 | #XXX Add subkey/value search accessor functions (?) |
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