Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2
3import hashlib
4import os
5import socket
6import struct
7import sys
8import unittest
9import fcntl
10import select
11
12TPM2_ST_NO_SESSIONS = 0x8001
13TPM2_ST_SESSIONS = 0x8002
14
15TPM2_CC_FIRST = 0x01FF
16
17TPM2_CC_CREATE_PRIMARY = 0x0131
18TPM2_CC_DICTIONARY_ATTACK_LOCK_RESET = 0x0139
19TPM2_CC_CREATE = 0x0153
20TPM2_CC_LOAD = 0x0157
21TPM2_CC_UNSEAL = 0x015E
22TPM2_CC_FLUSH_CONTEXT = 0x0165
23TPM2_CC_START_AUTH_SESSION = 0x0176
24TPM2_CC_GET_CAPABILITY = 0x017A
25TPM2_CC_GET_RANDOM = 0x017B
26TPM2_CC_PCR_READ = 0x017E
27TPM2_CC_POLICY_PCR = 0x017F
28TPM2_CC_PCR_EXTEND = 0x0182
29TPM2_CC_POLICY_PASSWORD = 0x018C
30TPM2_CC_POLICY_GET_DIGEST = 0x0189
31
32TPM2_SE_POLICY = 0x01
33TPM2_SE_TRIAL = 0x03
34
35TPM2_ALG_RSA = 0x0001
36TPM2_ALG_SHA1 = 0x0004
37TPM2_ALG_AES = 0x0006
38TPM2_ALG_KEYEDHASH = 0x0008
39TPM2_ALG_SHA256 = 0x000B
40TPM2_ALG_NULL = 0x0010
41TPM2_ALG_CBC = 0x0042
42TPM2_ALG_CFB = 0x0043
43
44TPM2_RH_OWNER = 0x40000001
45TPM2_RH_NULL = 0x40000007
46TPM2_RH_LOCKOUT = 0x4000000A
47TPM2_RS_PW = 0x40000009
48
49TPM2_RC_SIZE = 0x01D5
50TPM2_RC_AUTH_FAIL = 0x098E
51TPM2_RC_POLICY_FAIL = 0x099D
52TPM2_RC_COMMAND_CODE = 0x0143
53
54TSS2_RC_LAYER_SHIFT = 16
55TSS2_RESMGR_TPM_RC_LAYER = (11 << TSS2_RC_LAYER_SHIFT)
56
57TPM2_CAP_HANDLES = 0x00000001
58TPM2_CAP_COMMANDS = 0x00000002
59TPM2_CAP_PCRS = 0x00000005
60TPM2_CAP_TPM_PROPERTIES = 0x00000006
61
62TPM2_PT_FIXED = 0x100
63TPM2_PT_TOTAL_COMMANDS = TPM2_PT_FIXED + 41
64
65HR_SHIFT = 24
66HR_LOADED_SESSION = 0x02000000
67HR_TRANSIENT = 0x80000000
68
69SHA1_DIGEST_SIZE = 20
70SHA256_DIGEST_SIZE = 32
71
72TPM2_VER0_ERRORS = {
73 0x000: "TPM_RC_SUCCESS",
74 0x030: "TPM_RC_BAD_TAG",
75}
76
77TPM2_VER1_ERRORS = {
78 0x000: "TPM_RC_FAILURE",
79 0x001: "TPM_RC_FAILURE",
80 0x003: "TPM_RC_SEQUENCE",
81 0x00B: "TPM_RC_PRIVATE",
82 0x019: "TPM_RC_HMAC",
83 0x020: "TPM_RC_DISABLED",
84 0x021: "TPM_RC_EXCLUSIVE",
85 0x024: "TPM_RC_AUTH_TYPE",
86 0x025: "TPM_RC_AUTH_MISSING",
87 0x026: "TPM_RC_POLICY",
88 0x027: "TPM_RC_PCR",
89 0x028: "TPM_RC_PCR_CHANGED",
90 0x02D: "TPM_RC_UPGRADE",
91 0x02E: "TPM_RC_TOO_MANY_CONTEXTS",
92 0x02F: "TPM_RC_AUTH_UNAVAILABLE",
93 0x030: "TPM_RC_REBOOT",
94 0x031: "TPM_RC_UNBALANCED",
95 0x042: "TPM_RC_COMMAND_SIZE",
96 0x043: "TPM_RC_COMMAND_CODE",
97 0x044: "TPM_RC_AUTHSIZE",
98 0x045: "TPM_RC_AUTH_CONTEXT",
99 0x046: "TPM_RC_NV_RANGE",
100 0x047: "TPM_RC_NV_SIZE",
101 0x048: "TPM_RC_NV_LOCKED",
102 0x049: "TPM_RC_NV_AUTHORIZATION",
103 0x04A: "TPM_RC_NV_UNINITIALIZED",
104 0x04B: "TPM_RC_NV_SPACE",
105 0x04C: "TPM_RC_NV_DEFINED",
106 0x050: "TPM_RC_BAD_CONTEXT",
107 0x051: "TPM_RC_CPHASH",
108 0x052: "TPM_RC_PARENT",
109 0x053: "TPM_RC_NEEDS_TEST",
110 0x054: "TPM_RC_NO_RESULT",
111 0x055: "TPM_RC_SENSITIVE",
112 0x07F: "RC_MAX_FM0",
113}
114
115TPM2_FMT1_ERRORS = {
116 0x001: "TPM_RC_ASYMMETRIC",
117 0x002: "TPM_RC_ATTRIBUTES",
118 0x003: "TPM_RC_HASH",
119 0x004: "TPM_RC_VALUE",
120 0x005: "TPM_RC_HIERARCHY",
121 0x007: "TPM_RC_KEY_SIZE",
122 0x008: "TPM_RC_MGF",
123 0x009: "TPM_RC_MODE",
124 0x00A: "TPM_RC_TYPE",
125 0x00B: "TPM_RC_HANDLE",
126 0x00C: "TPM_RC_KDF",
127 0x00D: "TPM_RC_RANGE",
128 0x00E: "TPM_RC_AUTH_FAIL",
129 0x00F: "TPM_RC_NONCE",
130 0x010: "TPM_RC_PP",
131 0x012: "TPM_RC_SCHEME",
132 0x015: "TPM_RC_SIZE",
133 0x016: "TPM_RC_SYMMETRIC",
134 0x017: "TPM_RC_TAG",
135 0x018: "TPM_RC_SELECTOR",
136 0x01A: "TPM_RC_INSUFFICIENT",
137 0x01B: "TPM_RC_SIGNATURE",
138 0x01C: "TPM_RC_KEY",
139 0x01D: "TPM_RC_POLICY_FAIL",
140 0x01F: "TPM_RC_INTEGRITY",
141 0x020: "TPM_RC_TICKET",
142 0x021: "TPM_RC_RESERVED_BITS",
143 0x022: "TPM_RC_BAD_AUTH",
144 0x023: "TPM_RC_EXPIRED",
145 0x024: "TPM_RC_POLICY_CC",
146 0x025: "TPM_RC_BINDING",
147 0x026: "TPM_RC_CURVE",
148 0x027: "TPM_RC_ECC_POINT",
149}
150
151TPM2_WARN_ERRORS = {
152 0x001: "TPM_RC_CONTEXT_GAP",
153 0x002: "TPM_RC_OBJECT_MEMORY",
154 0x003: "TPM_RC_SESSION_MEMORY",
155 0x004: "TPM_RC_MEMORY",
156 0x005: "TPM_RC_SESSION_HANDLES",
157 0x006: "TPM_RC_OBJECT_HANDLES",
158 0x007: "TPM_RC_LOCALITY",
159 0x008: "TPM_RC_YIELDED",
160 0x009: "TPM_RC_CANCELED",
161 0x00A: "TPM_RC_TESTING",
162 0x010: "TPM_RC_REFERENCE_H0",
163 0x011: "TPM_RC_REFERENCE_H1",
164 0x012: "TPM_RC_REFERENCE_H2",
165 0x013: "TPM_RC_REFERENCE_H3",
166 0x014: "TPM_RC_REFERENCE_H4",
167 0x015: "TPM_RC_REFERENCE_H5",
168 0x016: "TPM_RC_REFERENCE_H6",
169 0x018: "TPM_RC_REFERENCE_S0",
170 0x019: "TPM_RC_REFERENCE_S1",
171 0x01A: "TPM_RC_REFERENCE_S2",
172 0x01B: "TPM_RC_REFERENCE_S3",
173 0x01C: "TPM_RC_REFERENCE_S4",
174 0x01D: "TPM_RC_REFERENCE_S5",
175 0x01E: "TPM_RC_REFERENCE_S6",
176 0x020: "TPM_RC_NV_RATE",
177 0x021: "TPM_RC_LOCKOUT",
178 0x022: "TPM_RC_RETRY",
179 0x023: "TPM_RC_NV_UNAVAILABLE",
180 0x7F: "TPM_RC_NOT_USED",
181}
182
183RC_VER1 = 0x100
184RC_FMT1 = 0x080
185RC_WARN = 0x900
186
187ALG_DIGEST_SIZE_MAP = {
188 TPM2_ALG_SHA1: SHA1_DIGEST_SIZE,
189 TPM2_ALG_SHA256: SHA256_DIGEST_SIZE,
190}
191
192ALG_HASH_FUNCTION_MAP = {
193 TPM2_ALG_SHA1: hashlib.sha1,
194 TPM2_ALG_SHA256: hashlib.sha256
195}
196
197NAME_ALG_MAP = {
198 "sha1": TPM2_ALG_SHA1,
199 "sha256": TPM2_ALG_SHA256,
200}
201
202
203class UnknownAlgorithmIdError(Exception):
204 def __init__(self, alg):
205 self.alg = alg
206
207 def __str__(self):
208 return '0x%0x' % (alg)
209
210
211class UnknownAlgorithmNameError(Exception):
212 def __init__(self, name):
213 self.name = name
214
215 def __str__(self):
216 return name
217
218
219class UnknownPCRBankError(Exception):
220 def __init__(self, alg):
221 self.alg = alg
222
223 def __str__(self):
224 return '0x%0x' % (alg)
225
226
227class ProtocolError(Exception):
228 def __init__(self, cc, rc):
229 self.cc = cc
230 self.rc = rc
231
232 if (rc & RC_FMT1) == RC_FMT1:
233 self.name = TPM2_FMT1_ERRORS.get(rc & 0x3f, "TPM_RC_UNKNOWN")
234 elif (rc & RC_WARN) == RC_WARN:
235 self.name = TPM2_WARN_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")
236 elif (rc & RC_VER1) == RC_VER1:
237 self.name = TPM2_VER1_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")
238 else:
239 self.name = TPM2_VER0_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")
240
241 def __str__(self):
242 if self.cc:
243 return '%s: cc=0x%08x, rc=0x%08x' % (self.name, self.cc, self.rc)
244 else:
245 return '%s: rc=0x%08x' % (self.name, self.rc)
246
247
248class AuthCommand(object):
249 """TPMS_AUTH_COMMAND"""
250
251 def __init__(self, session_handle=TPM2_RS_PW, nonce=bytes(),
252 session_attributes=0, hmac=bytes()):
253 self.session_handle = session_handle
254 self.nonce = nonce
255 self.session_attributes = session_attributes
256 self.hmac = hmac
257
258 def __bytes__(self):
259 fmt = '>I H%us B H%us' % (len(self.nonce), len(self.hmac))
260 return struct.pack(fmt, self.session_handle, len(self.nonce),
261 self.nonce, self.session_attributes, len(self.hmac),
262 self.hmac)
263
264 def __len__(self):
265 fmt = '>I H%us B H%us' % (len(self.nonce), len(self.hmac))
266 return struct.calcsize(fmt)
267
268
269class SensitiveCreate(object):
270 """TPMS_SENSITIVE_CREATE"""
271
272 def __init__(self, user_auth=bytes(), data=bytes()):
273 self.user_auth = user_auth
274 self.data = data
275
276 def __bytes__(self):
277 fmt = '>H%us H%us' % (len(self.user_auth), len(self.data))
278 return struct.pack(fmt, len(self.user_auth), self.user_auth,
279 len(self.data), self.data)
280
281 def __len__(self):
282 fmt = '>H%us H%us' % (len(self.user_auth), len(self.data))
283 return struct.calcsize(fmt)
284
285
286class Public(object):
287 """TPMT_PUBLIC"""
288
289 FIXED_TPM = (1 << 1)
290 FIXED_PARENT = (1 << 4)
291 SENSITIVE_DATA_ORIGIN = (1 << 5)
292 USER_WITH_AUTH = (1 << 6)
293 RESTRICTED = (1 << 16)
294 DECRYPT = (1 << 17)
295
296 def __fmt(self):
297 return '>HHIH%us%usH%us' % \
298 (len(self.auth_policy), len(self.parameters), len(self.unique))
299
300 def __init__(self, object_type, name_alg, object_attributes,
301 auth_policy=bytes(), parameters=bytes(),
302 unique=bytes()):
303 self.object_type = object_type
304 self.name_alg = name_alg
305 self.object_attributes = object_attributes
306 self.auth_policy = auth_policy
307 self.parameters = parameters
308 self.unique = unique
309
310 def __bytes__(self):
311 return struct.pack(self.__fmt(),
312 self.object_type,
313 self.name_alg,
314 self.object_attributes,
315 len(self.auth_policy),
316 self.auth_policy,
317 self.parameters,
318 len(self.unique),
319 self.unique)
320
321 def __len__(self):
322 return struct.calcsize(self.__fmt())
323
324
325def get_digest_size(alg):
326 ds = ALG_DIGEST_SIZE_MAP.get(alg)
327 if not ds:
328 raise UnknownAlgorithmIdError(alg)
329 return ds
330
331
332def get_hash_function(alg):
333 f = ALG_HASH_FUNCTION_MAP.get(alg)
334 if not f:
335 raise UnknownAlgorithmIdError(alg)
336 return f
337
338
339def get_algorithm(name):
340 alg = NAME_ALG_MAP.get(name)
341 if not alg:
342 raise UnknownAlgorithmNameError(name)
343 return alg
344
345
346def hex_dump(d):
347 d = [format(ord(x), '02x') for x in d]
348 d = [d[i: i + 16] for i in range(0, len(d), 16)]
349 d = [' '.join(x) for x in d]
350 d = os.linesep.join(d)
351
352 return d
353
354class Client:
355 FLAG_DEBUG = 0x01
356 FLAG_SPACE = 0x02
357 FLAG_NONBLOCK = 0x04
358 TPM_IOC_NEW_SPACE = 0xa200
359
360 def __init__(self, flags = 0):
361 self.flags = flags
362
363 if (self.flags & Client.FLAG_SPACE) == 0:
364 self.tpm = open('/dev/tpm0', 'r+b', buffering=0)
365 else:
366 self.tpm = open('/dev/tpmrm0', 'r+b', buffering=0)
367
368 if (self.flags & Client.FLAG_NONBLOCK):
369 flags = fcntl.fcntl(self.tpm, fcntl.F_GETFL)
370 flags |= os.O_NONBLOCK
371 fcntl.fcntl(self.tpm, fcntl.F_SETFL, flags)
372 self.tpm_poll = select.poll()
373
374 def close(self):
375 self.tpm.close()
376
377 def send_cmd(self, cmd):
378 self.tpm.write(cmd)
379
380 if (self.flags & Client.FLAG_NONBLOCK):
381 self.tpm_poll.register(self.tpm, select.POLLIN)
382 self.tpm_poll.poll(10000)
383
384 rsp = self.tpm.read()
385
386 if (self.flags & Client.FLAG_NONBLOCK):
387 self.tpm_poll.unregister(self.tpm)
388
389 if (self.flags & Client.FLAG_DEBUG) != 0:
390 sys.stderr.write('cmd' + os.linesep)
391 sys.stderr.write(hex_dump(cmd) + os.linesep)
392 sys.stderr.write('rsp' + os.linesep)
393 sys.stderr.write(hex_dump(rsp) + os.linesep)
394
395 rc = struct.unpack('>I', rsp[6:10])[0]
396 if rc != 0:
397 cc = struct.unpack('>I', cmd[6:10])[0]
398 raise ProtocolError(cc, rc)
399
400 return rsp
401
402 def read_pcr(self, i, bank_alg = TPM2_ALG_SHA1):
403 pcrsel_len = max((i >> 3) + 1, 3)
404 pcrsel = [0] * pcrsel_len
405 pcrsel[i >> 3] = 1 << (i & 7)
406 pcrsel = ''.join(map(chr, pcrsel)).encode()
407
408 fmt = '>HII IHB%us' % (pcrsel_len)
409 cmd = struct.pack(fmt,
410 TPM2_ST_NO_SESSIONS,
411 struct.calcsize(fmt),
412 TPM2_CC_PCR_READ,
413 1,
414 bank_alg,
415 pcrsel_len, pcrsel)
416
417 rsp = self.send_cmd(cmd)
418
419 pcr_update_cnt, pcr_select_cnt = struct.unpack('>II', rsp[10:18])
420 assert pcr_select_cnt == 1
421 rsp = rsp[18:]
422
423 alg2, pcrsel_len2 = struct.unpack('>HB', rsp[:3])
424 assert bank_alg == alg2 and pcrsel_len == pcrsel_len2
425 rsp = rsp[3 + pcrsel_len:]
426
427 digest_cnt = struct.unpack('>I', rsp[:4])[0]
428 if digest_cnt == 0:
429 return None
430 rsp = rsp[6:]
431
432 return rsp
433
434 def extend_pcr(self, i, dig, bank_alg = TPM2_ALG_SHA1):
435 ds = get_digest_size(bank_alg)
436 assert(ds == len(dig))
437
438 auth_cmd = AuthCommand()
439
440 fmt = '>HII I I%us IH%us' % (len(auth_cmd), ds)
441 cmd = struct.pack(
442 fmt,
443 TPM2_ST_SESSIONS,
444 struct.calcsize(fmt),
445 TPM2_CC_PCR_EXTEND,
446 i,
447 len(auth_cmd),
448 bytes(auth_cmd),
449 1, bank_alg, dig)
450
451 self.send_cmd(cmd)
452
453 def start_auth_session(self, session_type, name_alg = TPM2_ALG_SHA1):
454 fmt = '>HII IIH16sHBHH'
455 cmd = struct.pack(fmt,
456 TPM2_ST_NO_SESSIONS,
457 struct.calcsize(fmt),
458 TPM2_CC_START_AUTH_SESSION,
459 TPM2_RH_NULL,
460 TPM2_RH_NULL,
461 16,
462 ('\0' * 16).encode(),
463 0,
464 session_type,
465 TPM2_ALG_NULL,
466 name_alg)
467
468 return struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]
469
470 def __calc_pcr_digest(self, pcrs, bank_alg = TPM2_ALG_SHA1,
471 digest_alg = TPM2_ALG_SHA1):
472 x = []
473 f = get_hash_function(digest_alg)
474
475 for i in pcrs:
476 pcr = self.read_pcr(i, bank_alg)
477 if pcr is None:
478 return None
479 x += pcr
480
481 return f(bytearray(x)).digest()
482
483 def policy_pcr(self, handle, pcrs, bank_alg = TPM2_ALG_SHA1,
484 name_alg = TPM2_ALG_SHA1):
485 ds = get_digest_size(name_alg)
486 dig = self.__calc_pcr_digest(pcrs, bank_alg, name_alg)
487 if not dig:
488 raise UnknownPCRBankError(bank_alg)
489
490 pcrsel_len = max((max(pcrs) >> 3) + 1, 3)
491 pcrsel = [0] * pcrsel_len
492 for i in pcrs:
493 pcrsel[i >> 3] |= 1 << (i & 7)
494 pcrsel = ''.join(map(chr, pcrsel)).encode()
495
496 fmt = '>HII IH%usIHB3s' % ds
497 cmd = struct.pack(fmt,
498 TPM2_ST_NO_SESSIONS,
499 struct.calcsize(fmt),
500 TPM2_CC_POLICY_PCR,
501 handle,
502 len(dig),
503 bytes(dig),
504 1,
505 bank_alg,
506 pcrsel_len, pcrsel)
507
508 self.send_cmd(cmd)
509
510 def policy_password(self, handle):
511 fmt = '>HII I'
512 cmd = struct.pack(fmt,
513 TPM2_ST_NO_SESSIONS,
514 struct.calcsize(fmt),
515 TPM2_CC_POLICY_PASSWORD,
516 handle)
517
518 self.send_cmd(cmd)
519
520 def get_policy_digest(self, handle):
521 fmt = '>HII I'
522 cmd = struct.pack(fmt,
523 TPM2_ST_NO_SESSIONS,
524 struct.calcsize(fmt),
525 TPM2_CC_POLICY_GET_DIGEST,
526 handle)
527
528 return self.send_cmd(cmd)[12:]
529
530 def flush_context(self, handle):
531 fmt = '>HIII'
532 cmd = struct.pack(fmt,
533 TPM2_ST_NO_SESSIONS,
534 struct.calcsize(fmt),
535 TPM2_CC_FLUSH_CONTEXT,
536 handle)
537
538 self.send_cmd(cmd)
539
540 def create_root_key(self, auth_value = bytes()):
541 attributes = \
542 Public.FIXED_TPM | \
543 Public.FIXED_PARENT | \
544 Public.SENSITIVE_DATA_ORIGIN | \
545 Public.USER_WITH_AUTH | \
546 Public.RESTRICTED | \
547 Public.DECRYPT
548
549 auth_cmd = AuthCommand()
550 sensitive = SensitiveCreate(user_auth=auth_value)
551
552 public_parms = struct.pack(
553 '>HHHHHI',
554 TPM2_ALG_AES,
555 128,
556 TPM2_ALG_CFB,
557 TPM2_ALG_NULL,
558 2048,
559 0)
560
561 public = Public(
562 object_type=TPM2_ALG_RSA,
563 name_alg=TPM2_ALG_SHA1,
564 object_attributes=attributes,
565 parameters=public_parms)
566
567 fmt = '>HIII I%us H%us H%us HI' % \
568 (len(auth_cmd), len(sensitive), len(public))
569 cmd = struct.pack(
570 fmt,
571 TPM2_ST_SESSIONS,
572 struct.calcsize(fmt),
573 TPM2_CC_CREATE_PRIMARY,
574 TPM2_RH_OWNER,
575 len(auth_cmd),
576 bytes(auth_cmd),
577 len(sensitive),
578 bytes(sensitive),
579 len(public),
580 bytes(public),
581 0, 0)
582
583 return struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]
584
585 def seal(self, parent_key, data, auth_value, policy_dig,
586 name_alg = TPM2_ALG_SHA1):
587 ds = get_digest_size(name_alg)
588 assert(not policy_dig or ds == len(policy_dig))
589
590 attributes = 0
591 if not policy_dig:
592 attributes |= Public.USER_WITH_AUTH
593 policy_dig = bytes()
594
595 auth_cmd = AuthCommand()
596 sensitive = SensitiveCreate(user_auth=auth_value, data=data)
597
598 public = Public(
599 object_type=TPM2_ALG_KEYEDHASH,
600 name_alg=name_alg,
601 object_attributes=attributes,
602 auth_policy=policy_dig,
603 parameters=struct.pack('>H', TPM2_ALG_NULL))
604
605 fmt = '>HIII I%us H%us H%us HI' % \
606 (len(auth_cmd), len(sensitive), len(public))
607 cmd = struct.pack(
608 fmt,
609 TPM2_ST_SESSIONS,
610 struct.calcsize(fmt),
611 TPM2_CC_CREATE,
612 parent_key,
613 len(auth_cmd),
614 bytes(auth_cmd),
615 len(sensitive),
616 bytes(sensitive),
617 len(public),
618 bytes(public),
619 0, 0)
620
621 rsp = self.send_cmd(cmd)
622
623 return rsp[14:]
624
625 def unseal(self, parent_key, blob, auth_value, policy_handle):
626 private_len = struct.unpack('>H', blob[0:2])[0]
627 public_start = private_len + 2
628 public_len = struct.unpack('>H', blob[public_start:public_start + 2])[0]
629 blob = blob[:private_len + public_len + 4]
630
631 auth_cmd = AuthCommand()
632
633 fmt = '>HII I I%us %us' % (len(auth_cmd), len(blob))
634 cmd = struct.pack(
635 fmt,
636 TPM2_ST_SESSIONS,
637 struct.calcsize(fmt),
638 TPM2_CC_LOAD,
639 parent_key,
640 len(auth_cmd),
641 bytes(auth_cmd),
642 blob)
643
644 data_handle = struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]
645
646 if policy_handle:
647 auth_cmd = AuthCommand(session_handle=policy_handle, hmac=auth_value)
648 else:
649 auth_cmd = AuthCommand(hmac=auth_value)
650
651 fmt = '>HII I I%us' % (len(auth_cmd))
652 cmd = struct.pack(
653 fmt,
654 TPM2_ST_SESSIONS,
655 struct.calcsize(fmt),
656 TPM2_CC_UNSEAL,
657 data_handle,
658 len(auth_cmd),
659 bytes(auth_cmd))
660
661 try:
662 rsp = self.send_cmd(cmd)
663 finally:
664 self.flush_context(data_handle)
665
666 data_len = struct.unpack('>I', rsp[10:14])[0] - 2
667
668 return rsp[16:16 + data_len]
669
670 def reset_da_lock(self):
671 auth_cmd = AuthCommand()
672
673 fmt = '>HII I I%us' % (len(auth_cmd))
674 cmd = struct.pack(
675 fmt,
676 TPM2_ST_SESSIONS,
677 struct.calcsize(fmt),
678 TPM2_CC_DICTIONARY_ATTACK_LOCK_RESET,
679 TPM2_RH_LOCKOUT,
680 len(auth_cmd),
681 bytes(auth_cmd))
682
683 self.send_cmd(cmd)
684
685 def __get_cap_cnt(self, cap, pt, cnt):
686 handles = []
687 fmt = '>HII III'
688
689 cmd = struct.pack(fmt,
690 TPM2_ST_NO_SESSIONS,
691 struct.calcsize(fmt),
692 TPM2_CC_GET_CAPABILITY,
693 cap, pt, cnt)
694
695 rsp = self.send_cmd(cmd)[10:]
696 more_data, cap, cnt = struct.unpack('>BII', rsp[:9])
697 rsp = rsp[9:]
698
699 for i in range(0, cnt):
700 handle = struct.unpack('>I', rsp[:4])[0]
701 handles.append(handle)
702 rsp = rsp[4:]
703
704 return handles, more_data
705
706 def get_cap(self, cap, pt):
707 handles = []
708
709 more_data = True
710 while more_data:
711 next_handles, more_data = self.__get_cap_cnt(cap, pt, 1)
712 handles += next_handles
713 pt += 1
714
715 return handles
716
717 def get_cap_pcrs(self):
718 pcr_banks = {}
719
720 fmt = '>HII III'
721
722 cmd = struct.pack(fmt,
723 TPM2_ST_NO_SESSIONS,
724 struct.calcsize(fmt),
725 TPM2_CC_GET_CAPABILITY,
726 TPM2_CAP_PCRS, 0, 1)
727 rsp = self.send_cmd(cmd)[10:]
728 _, _, cnt = struct.unpack('>BII', rsp[:9])
729 rsp = rsp[9:]
730
731 # items are TPMS_PCR_SELECTION's
732 for i in range(0, cnt):
733 hash, sizeOfSelect = struct.unpack('>HB', rsp[:3])
734 rsp = rsp[3:]
735
736 pcrSelect = 0
737 if sizeOfSelect > 0:
738 pcrSelect, = struct.unpack('%ds' % sizeOfSelect,
739 rsp[:sizeOfSelect])
740 rsp = rsp[sizeOfSelect:]
741 pcrSelect = int.from_bytes(pcrSelect, byteorder='big')
742
743 pcr_banks[hash] = pcrSelect
744
745 return pcr_banks