1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
|
"""
"""
# Created on 2016.08.09
#
# Author: Giovanni Cannata
#
# Copyright 2016 - 2020 Giovanni Cannata
#
# This file is part of ldap3.
#
# ldap3 is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ldap3 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with ldap3 in the COPYING and COPYING.LESSER files.
# If not, see <http://www.gnu.org/licenses/>.
from binascii import a2b_hex, hexlify
from datetime import datetime
from calendar import timegm
from uuid import UUID
from struct import pack
from ... import SEQUENCE_TYPES, STRING_TYPES, NUMERIC_TYPES, INTEGER_TYPES
from .formatters import format_time, format_ad_timestamp
from ...utils.conv import to_raw, to_unicode, ldap_escape_to_bytes, escape_bytes
# Validators return True if value is valid, False if value is not valid,
# or a value different from True and False that is a valid value to substitute to the input value
def check_backslash(value):
if isinstance(value, (bytearray, bytes)):
if b'\\' in value:
value = value.replace(b'\\', b'\\5C')
elif isinstance(value, STRING_TYPES):
if '\\' in value:
value = value.replace('\\', '\\5C')
return value
def check_type(input_value, value_type):
if isinstance(input_value, value_type):
return True
if isinstance(input_value, SEQUENCE_TYPES):
for value in input_value:
if not isinstance(value, value_type):
return False
return True
return False
# noinspection PyUnusedLocal
def always_valid(input_value):
return True
def validate_generic_single_value(input_value):
if not isinstance(input_value, SEQUENCE_TYPES):
return True
try: # object couldn't have a __len__ method
if len(input_value) == 1:
return True
except Exception:
pass
return False
def validate_zero_and_minus_one_and_positive_int(input_value):
"""Accept -1 and 0 only (used by pwdLastSet in AD)
"""
if not isinstance(input_value, SEQUENCE_TYPES):
if isinstance(input_value, NUMERIC_TYPES) or isinstance(input_value, STRING_TYPES):
return True if int(input_value) >= -1 else False
return False
else:
if len(input_value) == 1 and (isinstance(input_value[0], NUMERIC_TYPES) or isinstance(input_value[0], STRING_TYPES)):
return True if int(input_value[0]) >= -1 else False
return False
def validate_integer(input_value):
if check_type(input_value, (float, bool)):
return False
if check_type(input_value, INTEGER_TYPES):
return True
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = [] # builds a list of valid int values
from decimal import Decimal, InvalidOperation
for element in input_value:
try: #try to convert any type to int, an invalid conversion raise TypeError or ValueError, doublecheck with Decimal type, if both are valid and equal then then int() value is used
value = to_unicode(element) if isinstance(element, bytes) else element
decimal_value = Decimal(value)
int_value = int(value)
if decimal_value == int_value:
valid_values.append(int_value)
else:
return False
except (ValueError, TypeError, InvalidOperation):
return False
if sequence:
return valid_values
else:
return valid_values[0]
def validate_bytes(input_value):
return check_type(input_value, bytes)
def validate_boolean(input_value):
# it could be a real bool or the string TRUE or FALSE, # only a single valued is allowed
if validate_generic_single_value(input_value): # valid only if a single value or a sequence with a single element
if isinstance(input_value, SEQUENCE_TYPES):
input_value = input_value[0]
if isinstance(input_value, bool):
if input_value:
return 'TRUE'
else:
return 'FALSE'
if str is not bytes and isinstance(input_value, bytes): # python3 try to converts bytes to string
input_value = to_unicode(input_value)
if isinstance(input_value, STRING_TYPES):
if input_value.lower() == 'true':
return 'TRUE'
elif input_value.lower() == 'false':
return 'FALSE'
return False
def validate_time_with_0_year(input_value):
# validates generalized time but accept a 0000 year too
# if datetime object doesn't have a timezone it's considered local time and is adjusted to UTC
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = []
changed = False
for element in input_value:
if str is not bytes and isinstance(element, bytes): # python3 try to converts bytes to string
element = to_unicode(element)
if isinstance(element, STRING_TYPES): # tries to check if it is already be a Generalized Time
if element.startswith('0000') or isinstance(format_time(to_raw(element)), datetime): # valid Generalized Time string
valid_values.append(element)
else:
return False
elif isinstance(element, datetime):
changed = True
if element.tzinfo: # a datetime with a timezone
valid_values.append(element.strftime('%Y%m%d%H%M%S%z'))
else: # datetime without timezone, assumed local and adjusted to UTC
offset = datetime.now() - datetime.utcnow()
valid_values.append((element - offset).strftime('%Y%m%d%H%M%SZ'))
else:
return False
if changed:
if sequence:
return valid_values
else:
return valid_values[0]
else:
return True
def validate_time(input_value):
# if datetime object doesn't have a timezone it's considered local time and is adjusted to UTC
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = []
changed = False
for element in input_value:
if str is not bytes and isinstance(element, bytes): # python3 try to converts bytes to string
element = to_unicode(element)
if isinstance(element, STRING_TYPES): # tries to check if it is already be a Generalized Time
if isinstance(format_time(to_raw(element)), datetime): # valid Generalized Time string
valid_values.append(element)
else:
return False
elif isinstance(element, datetime):
changed = True
if element.tzinfo: # a datetime with a timezone
valid_values.append(element.strftime('%Y%m%d%H%M%S%z'))
else: # datetime without timezone, assumed local and adjusted to UTC
offset = datetime.now() - datetime.utcnow()
valid_values.append((element - offset).strftime('%Y%m%d%H%M%SZ'))
else:
return False
if changed:
if sequence:
return valid_values
else:
return valid_values[0]
else:
return True
def validate_ad_timestamp(input_value):
"""
Active Directory stores date/time values as the number of 100-nanosecond intervals
that have elapsed since the 0 hour on January 1, 1601 till the date/time that is being stored.
The time is always stored in Greenwich Mean Time (GMT) in the Active Directory.
"""
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = []
changed = False
for element in input_value:
if str is not bytes and isinstance(element, bytes): # python3 try to converts bytes to string
element = to_unicode(element)
if isinstance(element, NUMERIC_TYPES):
if 0 <= element <= 9223372036854775807: # min and max for the AD timestamp starting from 12:00 AM January 1, 1601
valid_values.append(element)
else:
return False
elif isinstance(element, STRING_TYPES): # tries to check if it is already be a AD timestamp
if isinstance(format_ad_timestamp(to_raw(element)), datetime): # valid Generalized Time string
valid_values.append(element)
else:
return False
elif isinstance(element, datetime):
changed = True
if element.tzinfo: # a datetime with a timezone
valid_values.append(to_raw((timegm(element.utctimetuple()) + 11644473600) * 10000000, encoding='ascii'))
else: # datetime without timezone, assumed local and adjusted to UTC
offset = datetime.now() - datetime.utcnow()
valid_values.append(to_raw((timegm((element - offset).timetuple()) + 11644473600) * 10000000, encoding='ascii'))
else:
return False
if changed:
if sequence:
return valid_values
else:
return valid_values[0]
else:
return True
def validate_ad_timedelta(input_value):
"""
Should be validated like an AD timestamp except that since it is a time
delta, it is stored as a negative number.
"""
if not isinstance(input_value, INTEGER_TYPES) or input_value > 0:
return False
return validate_ad_timestamp(input_value * -1)
def validate_guid(input_value):
"""
object guid in uuid format (Novell eDirectory)
"""
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = []
changed = False
for element in input_value:
if isinstance(element, STRING_TYPES):
try:
valid_values.append(UUID(element).bytes)
changed = True
except ValueError: # try if the value is an escaped byte sequence
try:
valid_values.append(UUID(element.replace('\\', '')).bytes)
changed = True
continue
except ValueError:
if str is not bytes: # python 3
pass
else:
valid_values.append(element)
continue
return False
elif isinstance(element, (bytes, bytearray)): # assumes bytes are valid
valid_values.append(element)
else:
return False
if changed:
valid_values = [check_backslash(value) for value in valid_values]
if sequence:
return valid_values
else:
return valid_values[0]
else:
return True
def validate_uuid(input_value):
"""
object entryUUID in uuid format
"""
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = []
changed = False
for element in input_value:
if isinstance(element, STRING_TYPES):
try:
valid_values.append(str(UUID(element)))
changed = True
except ValueError: # try if the value is an escaped byte sequence
try:
valid_values.append(str(UUID(element.replace('\\', ''))))
changed = True
continue
except ValueError:
if str is not bytes: # python 3
pass
else:
valid_values.append(element)
continue
return False
elif isinstance(element, (bytes, bytearray)): # assumes bytes are valid
valid_values.append(element)
else:
return False
if changed:
valid_values = [check_backslash(value) for value in valid_values]
if sequence:
return valid_values
else:
return valid_values[0]
else:
return True
def validate_uuid_le(input_value):
"""
Active Directory stores objectGUID in uuid_le format, follows RFC4122 and MS-DTYP:
"{07039e68-4373-264d-a0a7-07039e684373}": string representation big endian, converted to little endian (with or without brace curles)
"689e030773434d26a7a007039e684373": packet representation, already in little endian
"\68\9e\03\07\73\43\4d\26\a7\a0\07\03\9e\68\43\73": bytes representation, already in little endian
byte sequence: already in little endian
"""
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = []
changed = False
for element in input_value:
error = False
if isinstance(element, STRING_TYPES):
if element[0] == '{' and element[-1] == '}':
try:
valid_values.append(UUID(hex=element).bytes_le) # string representation, value in big endian, converts to little endian
changed = True
except ValueError:
error = True
elif '-' in element:
try:
valid_values.append(UUID(hex=element).bytes_le) # string representation, value in big endian, converts to little endian
changed = True
except ValueError:
error = True
elif '\\' in element:
try:
uuid = UUID(bytes_le=ldap_escape_to_bytes(element)).bytes_le
uuid = escape_bytes(uuid)
valid_values.append(uuid) # byte representation, value in little endian
changed = True
except ValueError:
error = True
elif '-' not in element: # value in little endian
try:
valid_values.append(UUID(bytes_le=a2b_hex(element)).bytes_le) # packet representation, value in little endian, converts to little endian
changed = True
except ValueError:
error = True
if error and str == bytes: # python2 only assume value is bytes and valid
valid_values.append(element) # value is untouched, must be in little endian
elif isinstance(element, (bytes, bytearray)): # assumes bytes are valid uuid
valid_values.append(element) # value is untouched, must be in little endian
else:
return False
if changed:
valid_values = [check_backslash(value) for value in valid_values]
if sequence:
return valid_values
else:
return valid_values[0]
else:
return True
def validate_sid(input_value):
"""
SID= "S-1-" IdentifierAuthority 1*SubAuthority
IdentifierAuthority= IdentifierAuthorityDec / IdentifierAuthorityHex
; If the identifier authority is < 2^32, the
; identifier authority is represented as a decimal
; number
; If the identifier authority is >= 2^32,
; the identifier authority is represented in
; hexadecimal
IdentifierAuthorityDec = 1*10DIGIT
; IdentifierAuthorityDec, top level authority of a
; security identifier is represented as a decimal number
IdentifierAuthorityHex = "0x" 12HEXDIG
; IdentifierAuthorityHex, the top-level authority of a
; security identifier is represented as a hexadecimal number
SubAuthority= "-" 1*10DIGIT
; Sub-Authority is always represented as a decimal number
; No leading "0" characters are allowed when IdentifierAuthority
; or SubAuthority is represented as a decimal number
; All hexadecimal digits must be output in string format,
; pre-pended by "0x"
Revision (1 byte): An 8-bit unsigned integer that specifies the revision level of the SID. This value MUST be set to 0x01.
SubAuthorityCount (1 byte): An 8-bit unsigned integer that specifies the number of elements in the SubAuthority array. The maximum number of elements allowed is 15.
IdentifierAuthority (6 bytes): A SID_IDENTIFIER_AUTHORITY structure that indicates the authority under which the SID was created. It describes the entity that created the SID. The Identifier Authority value {0,0,0,0,0,5} denotes SIDs created by the NT SID authority.
SubAuthority (variable): A variable length array of unsigned 32-bit integers that uniquely identifies a principal relative to the IdentifierAuthority. Its length is determined by SubAuthorityCount.
If you have a SID like S-a-b-c-d-e-f-g-...
Then the bytes are
a (revision)
N (number of dashes minus two)
bbbbbb (six bytes of "b" treated as a 48-bit number in big-endian format)
cccc (four bytes of "c" treated as a 32-bit number in little-endian format)
dddd (four bytes of "d" treated as a 32-bit number in little-endian format)
eeee (four bytes of "e" treated as a 32-bit number in little-endian format)
ffff (four bytes of "f" treated as a 32-bit number in little-endian format)
"""
if not isinstance(input_value, SEQUENCE_TYPES):
sequence = False
input_value = [input_value]
else:
sequence = True # indicates if a sequence must be returned
valid_values = []
changed = False
for element in input_value:
if isinstance(element, STRING_TYPES):
if element.startswith('S-'):
parts = element.split('-')
sid_bytes = pack('<q', int(parts[1]))[0:1] # revision number
sid_bytes += pack('<q', len(parts[3:]))[0:1] # number of sub authorities
if len(parts[2]) <= 10:
sid_bytes += pack('>q', int(parts[2]))[2:] # authority (in dec)
else:
sid_bytes += pack('>q', int(parts[2], 16))[2:] # authority (in hex)
for sub_auth in parts[3:]:
sid_bytes += pack('<q', int(sub_auth))[0:4] # sub-authorities
valid_values.append(sid_bytes)
changed = True
if changed:
valid_values = [check_backslash(value) for value in valid_values]
if sequence:
return valid_values
else:
return valid_values[0]
else:
return True
|