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-rw-r--r--tools/testing/selftests/tpm2/tpm2.py749
1 files changed, 749 insertions, 0 deletions
diff --git a/tools/testing/selftests/tpm2/tpm2.py b/tools/testing/selftests/tpm2/tpm2.py
new file mode 100644
index 000000000..c7363c676
--- /dev/null
+++ b/tools/testing/selftests/tpm2/tpm2.py
@@ -0,0 +1,749 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+
+import hashlib
+import os
+import socket
+import struct
+import sys
+import unittest
+import fcntl
+import select
+
+TPM2_ST_NO_SESSIONS = 0x8001
+TPM2_ST_SESSIONS = 0x8002
+
+TPM2_CC_FIRST = 0x01FF
+
+TPM2_CC_CREATE_PRIMARY = 0x0131
+TPM2_CC_DICTIONARY_ATTACK_LOCK_RESET = 0x0139
+TPM2_CC_CREATE = 0x0153
+TPM2_CC_LOAD = 0x0157
+TPM2_CC_UNSEAL = 0x015E
+TPM2_CC_FLUSH_CONTEXT = 0x0165
+TPM2_CC_START_AUTH_SESSION = 0x0176
+TPM2_CC_GET_CAPABILITY = 0x017A
+TPM2_CC_GET_RANDOM = 0x017B
+TPM2_CC_PCR_READ = 0x017E
+TPM2_CC_POLICY_PCR = 0x017F
+TPM2_CC_PCR_EXTEND = 0x0182
+TPM2_CC_POLICY_PASSWORD = 0x018C
+TPM2_CC_POLICY_GET_DIGEST = 0x0189
+
+TPM2_SE_POLICY = 0x01
+TPM2_SE_TRIAL = 0x03
+
+TPM2_ALG_RSA = 0x0001
+TPM2_ALG_SHA1 = 0x0004
+TPM2_ALG_AES = 0x0006
+TPM2_ALG_KEYEDHASH = 0x0008
+TPM2_ALG_SHA256 = 0x000B
+TPM2_ALG_NULL = 0x0010
+TPM2_ALG_CBC = 0x0042
+TPM2_ALG_CFB = 0x0043
+
+TPM2_RH_OWNER = 0x40000001
+TPM2_RH_NULL = 0x40000007
+TPM2_RH_LOCKOUT = 0x4000000A
+TPM2_RS_PW = 0x40000009
+
+TPM2_RC_SIZE = 0x01D5
+TPM2_RC_AUTH_FAIL = 0x098E
+TPM2_RC_POLICY_FAIL = 0x099D
+TPM2_RC_COMMAND_CODE = 0x0143
+
+TSS2_RC_LAYER_SHIFT = 16
+TSS2_RESMGR_TPM_RC_LAYER = (11 << TSS2_RC_LAYER_SHIFT)
+
+TPM2_CAP_HANDLES = 0x00000001
+TPM2_CAP_COMMANDS = 0x00000002
+TPM2_CAP_PCRS = 0x00000005
+TPM2_CAP_TPM_PROPERTIES = 0x00000006
+
+TPM2_PT_FIXED = 0x100
+TPM2_PT_TOTAL_COMMANDS = TPM2_PT_FIXED + 41
+
+HR_SHIFT = 24
+HR_LOADED_SESSION = 0x02000000
+HR_TRANSIENT = 0x80000000
+
+SHA1_DIGEST_SIZE = 20
+SHA256_DIGEST_SIZE = 32
+
+TPM2_VER0_ERRORS = {
+ 0x000: "TPM_RC_SUCCESS",
+ 0x030: "TPM_RC_BAD_TAG",
+}
+
+TPM2_VER1_ERRORS = {
+ 0x000: "TPM_RC_FAILURE",
+ 0x001: "TPM_RC_FAILURE",
+ 0x003: "TPM_RC_SEQUENCE",
+ 0x00B: "TPM_RC_PRIVATE",
+ 0x019: "TPM_RC_HMAC",
+ 0x020: "TPM_RC_DISABLED",
+ 0x021: "TPM_RC_EXCLUSIVE",
+ 0x024: "TPM_RC_AUTH_TYPE",
+ 0x025: "TPM_RC_AUTH_MISSING",
+ 0x026: "TPM_RC_POLICY",
+ 0x027: "TPM_RC_PCR",
+ 0x028: "TPM_RC_PCR_CHANGED",
+ 0x02D: "TPM_RC_UPGRADE",
+ 0x02E: "TPM_RC_TOO_MANY_CONTEXTS",
+ 0x02F: "TPM_RC_AUTH_UNAVAILABLE",
+ 0x030: "TPM_RC_REBOOT",
+ 0x031: "TPM_RC_UNBALANCED",
+ 0x042: "TPM_RC_COMMAND_SIZE",
+ 0x043: "TPM_RC_COMMAND_CODE",
+ 0x044: "TPM_RC_AUTHSIZE",
+ 0x045: "TPM_RC_AUTH_CONTEXT",
+ 0x046: "TPM_RC_NV_RANGE",
+ 0x047: "TPM_RC_NV_SIZE",
+ 0x048: "TPM_RC_NV_LOCKED",
+ 0x049: "TPM_RC_NV_AUTHORIZATION",
+ 0x04A: "TPM_RC_NV_UNINITIALIZED",
+ 0x04B: "TPM_RC_NV_SPACE",
+ 0x04C: "TPM_RC_NV_DEFINED",
+ 0x050: "TPM_RC_BAD_CONTEXT",
+ 0x051: "TPM_RC_CPHASH",
+ 0x052: "TPM_RC_PARENT",
+ 0x053: "TPM_RC_NEEDS_TEST",
+ 0x054: "TPM_RC_NO_RESULT",
+ 0x055: "TPM_RC_SENSITIVE",
+ 0x07F: "RC_MAX_FM0",
+}
+
+TPM2_FMT1_ERRORS = {
+ 0x001: "TPM_RC_ASYMMETRIC",
+ 0x002: "TPM_RC_ATTRIBUTES",
+ 0x003: "TPM_RC_HASH",
+ 0x004: "TPM_RC_VALUE",
+ 0x005: "TPM_RC_HIERARCHY",
+ 0x007: "TPM_RC_KEY_SIZE",
+ 0x008: "TPM_RC_MGF",
+ 0x009: "TPM_RC_MODE",
+ 0x00A: "TPM_RC_TYPE",
+ 0x00B: "TPM_RC_HANDLE",
+ 0x00C: "TPM_RC_KDF",
+ 0x00D: "TPM_RC_RANGE",
+ 0x00E: "TPM_RC_AUTH_FAIL",
+ 0x00F: "TPM_RC_NONCE",
+ 0x010: "TPM_RC_PP",
+ 0x012: "TPM_RC_SCHEME",
+ 0x015: "TPM_RC_SIZE",
+ 0x016: "TPM_RC_SYMMETRIC",
+ 0x017: "TPM_RC_TAG",
+ 0x018: "TPM_RC_SELECTOR",
+ 0x01A: "TPM_RC_INSUFFICIENT",
+ 0x01B: "TPM_RC_SIGNATURE",
+ 0x01C: "TPM_RC_KEY",
+ 0x01D: "TPM_RC_POLICY_FAIL",
+ 0x01F: "TPM_RC_INTEGRITY",
+ 0x020: "TPM_RC_TICKET",
+ 0x021: "TPM_RC_RESERVED_BITS",
+ 0x022: "TPM_RC_BAD_AUTH",
+ 0x023: "TPM_RC_EXPIRED",
+ 0x024: "TPM_RC_POLICY_CC",
+ 0x025: "TPM_RC_BINDING",
+ 0x026: "TPM_RC_CURVE",
+ 0x027: "TPM_RC_ECC_POINT",
+}
+
+TPM2_WARN_ERRORS = {
+ 0x001: "TPM_RC_CONTEXT_GAP",
+ 0x002: "TPM_RC_OBJECT_MEMORY",
+ 0x003: "TPM_RC_SESSION_MEMORY",
+ 0x004: "TPM_RC_MEMORY",
+ 0x005: "TPM_RC_SESSION_HANDLES",
+ 0x006: "TPM_RC_OBJECT_HANDLES",
+ 0x007: "TPM_RC_LOCALITY",
+ 0x008: "TPM_RC_YIELDED",
+ 0x009: "TPM_RC_CANCELED",
+ 0x00A: "TPM_RC_TESTING",
+ 0x010: "TPM_RC_REFERENCE_H0",
+ 0x011: "TPM_RC_REFERENCE_H1",
+ 0x012: "TPM_RC_REFERENCE_H2",
+ 0x013: "TPM_RC_REFERENCE_H3",
+ 0x014: "TPM_RC_REFERENCE_H4",
+ 0x015: "TPM_RC_REFERENCE_H5",
+ 0x016: "TPM_RC_REFERENCE_H6",
+ 0x018: "TPM_RC_REFERENCE_S0",
+ 0x019: "TPM_RC_REFERENCE_S1",
+ 0x01A: "TPM_RC_REFERENCE_S2",
+ 0x01B: "TPM_RC_REFERENCE_S3",
+ 0x01C: "TPM_RC_REFERENCE_S4",
+ 0x01D: "TPM_RC_REFERENCE_S5",
+ 0x01E: "TPM_RC_REFERENCE_S6",
+ 0x020: "TPM_RC_NV_RATE",
+ 0x021: "TPM_RC_LOCKOUT",
+ 0x022: "TPM_RC_RETRY",
+ 0x023: "TPM_RC_NV_UNAVAILABLE",
+ 0x7F: "TPM_RC_NOT_USED",
+}
+
+RC_VER1 = 0x100
+RC_FMT1 = 0x080
+RC_WARN = 0x900
+
+ALG_DIGEST_SIZE_MAP = {
+ TPM2_ALG_SHA1: SHA1_DIGEST_SIZE,
+ TPM2_ALG_SHA256: SHA256_DIGEST_SIZE,
+}
+
+ALG_HASH_FUNCTION_MAP = {
+ TPM2_ALG_SHA1: hashlib.sha1,
+ TPM2_ALG_SHA256: hashlib.sha256
+}
+
+NAME_ALG_MAP = {
+ "sha1": TPM2_ALG_SHA1,
+ "sha256": TPM2_ALG_SHA256,
+}
+
+
+class UnknownAlgorithmIdError(Exception):
+ def __init__(self, alg):
+ self.alg = alg
+
+ def __str__(self):
+ return '0x%0x' % (alg)
+
+
+class UnknownAlgorithmNameError(Exception):
+ def __init__(self, name):
+ self.name = name
+
+ def __str__(self):
+ return name
+
+
+class UnknownPCRBankError(Exception):
+ def __init__(self, alg):
+ self.alg = alg
+
+ def __str__(self):
+ return '0x%0x' % (alg)
+
+
+class ProtocolError(Exception):
+ def __init__(self, cc, rc):
+ self.cc = cc
+ self.rc = rc
+
+ if (rc & RC_FMT1) == RC_FMT1:
+ self.name = TPM2_FMT1_ERRORS.get(rc & 0x3f, "TPM_RC_UNKNOWN")
+ elif (rc & RC_WARN) == RC_WARN:
+ self.name = TPM2_WARN_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")
+ elif (rc & RC_VER1) == RC_VER1:
+ self.name = TPM2_VER1_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")
+ else:
+ self.name = TPM2_VER0_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")
+
+ def __str__(self):
+ if self.cc:
+ return '%s: cc=0x%08x, rc=0x%08x' % (self.name, self.cc, self.rc)
+ else:
+ return '%s: rc=0x%08x' % (self.name, self.rc)
+
+
+class AuthCommand(object):
+ """TPMS_AUTH_COMMAND"""
+
+ def __init__(self, session_handle=TPM2_RS_PW, nonce=bytes(),
+ session_attributes=0, hmac=bytes()):
+ self.session_handle = session_handle
+ self.nonce = nonce
+ self.session_attributes = session_attributes
+ self.hmac = hmac
+
+ def __bytes__(self):
+ fmt = '>I H%us B H%us' % (len(self.nonce), len(self.hmac))
+ return struct.pack(fmt, self.session_handle, len(self.nonce),
+ self.nonce, self.session_attributes, len(self.hmac),
+ self.hmac)
+
+ def __len__(self):
+ fmt = '>I H%us B H%us' % (len(self.nonce), len(self.hmac))
+ return struct.calcsize(fmt)
+
+
+class SensitiveCreate(object):
+ """TPMS_SENSITIVE_CREATE"""
+
+ def __init__(self, user_auth=bytes(), data=bytes()):
+ self.user_auth = user_auth
+ self.data = data
+
+ def __bytes__(self):
+ fmt = '>H%us H%us' % (len(self.user_auth), len(self.data))
+ return struct.pack(fmt, len(self.user_auth), self.user_auth,
+ len(self.data), self.data)
+
+ def __len__(self):
+ fmt = '>H%us H%us' % (len(self.user_auth), len(self.data))
+ return struct.calcsize(fmt)
+
+
+class Public(object):
+ """TPMT_PUBLIC"""
+
+ FIXED_TPM = (1 << 1)
+ FIXED_PARENT = (1 << 4)
+ SENSITIVE_DATA_ORIGIN = (1 << 5)
+ USER_WITH_AUTH = (1 << 6)
+ RESTRICTED = (1 << 16)
+ DECRYPT = (1 << 17)
+
+ def __fmt(self):
+ return '>HHIH%us%usH%us' % \
+ (len(self.auth_policy), len(self.parameters), len(self.unique))
+
+ def __init__(self, object_type, name_alg, object_attributes,
+ auth_policy=bytes(), parameters=bytes(),
+ unique=bytes()):
+ self.object_type = object_type
+ self.name_alg = name_alg
+ self.object_attributes = object_attributes
+ self.auth_policy = auth_policy
+ self.parameters = parameters
+ self.unique = unique
+
+ def __bytes__(self):
+ return struct.pack(self.__fmt(),
+ self.object_type,
+ self.name_alg,
+ self.object_attributes,
+ len(self.auth_policy),
+ self.auth_policy,
+ self.parameters,
+ len(self.unique),
+ self.unique)
+
+ def __len__(self):
+ return struct.calcsize(self.__fmt())
+
+
+def get_digest_size(alg):
+ ds = ALG_DIGEST_SIZE_MAP.get(alg)
+ if not ds:
+ raise UnknownAlgorithmIdError(alg)
+ return ds
+
+
+def get_hash_function(alg):
+ f = ALG_HASH_FUNCTION_MAP.get(alg)
+ if not f:
+ raise UnknownAlgorithmIdError(alg)
+ return f
+
+
+def get_algorithm(name):
+ alg = NAME_ALG_MAP.get(name)
+ if not alg:
+ raise UnknownAlgorithmNameError(name)
+ return alg
+
+
+def hex_dump(d):
+ d = [format(ord(x), '02x') for x in d]
+ d = [d[i: i + 16] for i in range(0, len(d), 16)]
+ d = [' '.join(x) for x in d]
+ d = os.linesep.join(d)
+
+ return d
+
+class Client:
+ FLAG_DEBUG = 0x01
+ FLAG_SPACE = 0x02
+ FLAG_NONBLOCK = 0x04
+ TPM_IOC_NEW_SPACE = 0xa200
+
+ def __init__(self, flags = 0):
+ self.flags = flags
+
+ if (self.flags & Client.FLAG_SPACE) == 0:
+ self.tpm = open('/dev/tpm0', 'r+b', buffering=0)
+ else:
+ self.tpm = open('/dev/tpmrm0', 'r+b', buffering=0)
+
+ if (self.flags & Client.FLAG_NONBLOCK):
+ flags = fcntl.fcntl(self.tpm, fcntl.F_GETFL)
+ flags |= os.O_NONBLOCK
+ fcntl.fcntl(self.tpm, fcntl.F_SETFL, flags)
+ self.tpm_poll = select.poll()
+
+ def __del__(self):
+ if self.tpm:
+ self.tpm.close()
+
+ def close(self):
+ self.tpm.close()
+
+ def send_cmd(self, cmd):
+ self.tpm.write(cmd)
+
+ if (self.flags & Client.FLAG_NONBLOCK):
+ self.tpm_poll.register(self.tpm, select.POLLIN)
+ self.tpm_poll.poll(10000)
+
+ rsp = self.tpm.read()
+
+ if (self.flags & Client.FLAG_NONBLOCK):
+ self.tpm_poll.unregister(self.tpm)
+
+ if (self.flags & Client.FLAG_DEBUG) != 0:
+ sys.stderr.write('cmd' + os.linesep)
+ sys.stderr.write(hex_dump(cmd) + os.linesep)
+ sys.stderr.write('rsp' + os.linesep)
+ sys.stderr.write(hex_dump(rsp) + os.linesep)
+
+ rc = struct.unpack('>I', rsp[6:10])[0]
+ if rc != 0:
+ cc = struct.unpack('>I', cmd[6:10])[0]
+ raise ProtocolError(cc, rc)
+
+ return rsp
+
+ def read_pcr(self, i, bank_alg = TPM2_ALG_SHA1):
+ pcrsel_len = max((i >> 3) + 1, 3)
+ pcrsel = [0] * pcrsel_len
+ pcrsel[i >> 3] = 1 << (i & 7)
+ pcrsel = ''.join(map(chr, pcrsel)).encode()
+
+ fmt = '>HII IHB%us' % (pcrsel_len)
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_PCR_READ,
+ 1,
+ bank_alg,
+ pcrsel_len, pcrsel)
+
+ rsp = self.send_cmd(cmd)
+
+ pcr_update_cnt, pcr_select_cnt = struct.unpack('>II', rsp[10:18])
+ assert pcr_select_cnt == 1
+ rsp = rsp[18:]
+
+ alg2, pcrsel_len2 = struct.unpack('>HB', rsp[:3])
+ assert bank_alg == alg2 and pcrsel_len == pcrsel_len2
+ rsp = rsp[3 + pcrsel_len:]
+
+ digest_cnt = struct.unpack('>I', rsp[:4])[0]
+ if digest_cnt == 0:
+ return None
+ rsp = rsp[6:]
+
+ return rsp
+
+ def extend_pcr(self, i, dig, bank_alg = TPM2_ALG_SHA1):
+ ds = get_digest_size(bank_alg)
+ assert(ds == len(dig))
+
+ auth_cmd = AuthCommand()
+
+ fmt = '>HII I I%us IH%us' % (len(auth_cmd), ds)
+ cmd = struct.pack(
+ fmt,
+ TPM2_ST_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_PCR_EXTEND,
+ i,
+ len(auth_cmd),
+ bytes(auth_cmd),
+ 1, bank_alg, dig)
+
+ self.send_cmd(cmd)
+
+ def start_auth_session(self, session_type, name_alg = TPM2_ALG_SHA1):
+ fmt = '>HII IIH16sHBHH'
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_START_AUTH_SESSION,
+ TPM2_RH_NULL,
+ TPM2_RH_NULL,
+ 16,
+ ('\0' * 16).encode(),
+ 0,
+ session_type,
+ TPM2_ALG_NULL,
+ name_alg)
+
+ return struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]
+
+ def __calc_pcr_digest(self, pcrs, bank_alg = TPM2_ALG_SHA1,
+ digest_alg = TPM2_ALG_SHA1):
+ x = []
+ f = get_hash_function(digest_alg)
+
+ for i in pcrs:
+ pcr = self.read_pcr(i, bank_alg)
+ if pcr is None:
+ return None
+ x += pcr
+
+ return f(bytearray(x)).digest()
+
+ def policy_pcr(self, handle, pcrs, bank_alg = TPM2_ALG_SHA1,
+ name_alg = TPM2_ALG_SHA1):
+ ds = get_digest_size(name_alg)
+ dig = self.__calc_pcr_digest(pcrs, bank_alg, name_alg)
+ if not dig:
+ raise UnknownPCRBankError(bank_alg)
+
+ pcrsel_len = max((max(pcrs) >> 3) + 1, 3)
+ pcrsel = [0] * pcrsel_len
+ for i in pcrs:
+ pcrsel[i >> 3] |= 1 << (i & 7)
+ pcrsel = ''.join(map(chr, pcrsel)).encode()
+
+ fmt = '>HII IH%usIHB3s' % ds
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_POLICY_PCR,
+ handle,
+ len(dig),
+ bytes(dig),
+ 1,
+ bank_alg,
+ pcrsel_len, pcrsel)
+
+ self.send_cmd(cmd)
+
+ def policy_password(self, handle):
+ fmt = '>HII I'
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_POLICY_PASSWORD,
+ handle)
+
+ self.send_cmd(cmd)
+
+ def get_policy_digest(self, handle):
+ fmt = '>HII I'
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_POLICY_GET_DIGEST,
+ handle)
+
+ return self.send_cmd(cmd)[12:]
+
+ def flush_context(self, handle):
+ fmt = '>HIII'
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_FLUSH_CONTEXT,
+ handle)
+
+ self.send_cmd(cmd)
+
+ def create_root_key(self, auth_value = bytes()):
+ attributes = \
+ Public.FIXED_TPM | \
+ Public.FIXED_PARENT | \
+ Public.SENSITIVE_DATA_ORIGIN | \
+ Public.USER_WITH_AUTH | \
+ Public.RESTRICTED | \
+ Public.DECRYPT
+
+ auth_cmd = AuthCommand()
+ sensitive = SensitiveCreate(user_auth=auth_value)
+
+ public_parms = struct.pack(
+ '>HHHHHI',
+ TPM2_ALG_AES,
+ 128,
+ TPM2_ALG_CFB,
+ TPM2_ALG_NULL,
+ 2048,
+ 0)
+
+ public = Public(
+ object_type=TPM2_ALG_RSA,
+ name_alg=TPM2_ALG_SHA1,
+ object_attributes=attributes,
+ parameters=public_parms)
+
+ fmt = '>HIII I%us H%us H%us HI' % \
+ (len(auth_cmd), len(sensitive), len(public))
+ cmd = struct.pack(
+ fmt,
+ TPM2_ST_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_CREATE_PRIMARY,
+ TPM2_RH_OWNER,
+ len(auth_cmd),
+ bytes(auth_cmd),
+ len(sensitive),
+ bytes(sensitive),
+ len(public),
+ bytes(public),
+ 0, 0)
+
+ return struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]
+
+ def seal(self, parent_key, data, auth_value, policy_dig,
+ name_alg = TPM2_ALG_SHA1):
+ ds = get_digest_size(name_alg)
+ assert(not policy_dig or ds == len(policy_dig))
+
+ attributes = 0
+ if not policy_dig:
+ attributes |= Public.USER_WITH_AUTH
+ policy_dig = bytes()
+
+ auth_cmd = AuthCommand()
+ sensitive = SensitiveCreate(user_auth=auth_value, data=data)
+
+ public = Public(
+ object_type=TPM2_ALG_KEYEDHASH,
+ name_alg=name_alg,
+ object_attributes=attributes,
+ auth_policy=policy_dig,
+ parameters=struct.pack('>H', TPM2_ALG_NULL))
+
+ fmt = '>HIII I%us H%us H%us HI' % \
+ (len(auth_cmd), len(sensitive), len(public))
+ cmd = struct.pack(
+ fmt,
+ TPM2_ST_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_CREATE,
+ parent_key,
+ len(auth_cmd),
+ bytes(auth_cmd),
+ len(sensitive),
+ bytes(sensitive),
+ len(public),
+ bytes(public),
+ 0, 0)
+
+ rsp = self.send_cmd(cmd)
+
+ return rsp[14:]
+
+ def unseal(self, parent_key, blob, auth_value, policy_handle):
+ private_len = struct.unpack('>H', blob[0:2])[0]
+ public_start = private_len + 2
+ public_len = struct.unpack('>H', blob[public_start:public_start + 2])[0]
+ blob = blob[:private_len + public_len + 4]
+
+ auth_cmd = AuthCommand()
+
+ fmt = '>HII I I%us %us' % (len(auth_cmd), len(blob))
+ cmd = struct.pack(
+ fmt,
+ TPM2_ST_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_LOAD,
+ parent_key,
+ len(auth_cmd),
+ bytes(auth_cmd),
+ blob)
+
+ data_handle = struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]
+
+ if policy_handle:
+ auth_cmd = AuthCommand(session_handle=policy_handle, hmac=auth_value)
+ else:
+ auth_cmd = AuthCommand(hmac=auth_value)
+
+ fmt = '>HII I I%us' % (len(auth_cmd))
+ cmd = struct.pack(
+ fmt,
+ TPM2_ST_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_UNSEAL,
+ data_handle,
+ len(auth_cmd),
+ bytes(auth_cmd))
+
+ try:
+ rsp = self.send_cmd(cmd)
+ finally:
+ self.flush_context(data_handle)
+
+ data_len = struct.unpack('>I', rsp[10:14])[0] - 2
+
+ return rsp[16:16 + data_len]
+
+ def reset_da_lock(self):
+ auth_cmd = AuthCommand()
+
+ fmt = '>HII I I%us' % (len(auth_cmd))
+ cmd = struct.pack(
+ fmt,
+ TPM2_ST_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_DICTIONARY_ATTACK_LOCK_RESET,
+ TPM2_RH_LOCKOUT,
+ len(auth_cmd),
+ bytes(auth_cmd))
+
+ self.send_cmd(cmd)
+
+ def __get_cap_cnt(self, cap, pt, cnt):
+ handles = []
+ fmt = '>HII III'
+
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_GET_CAPABILITY,
+ cap, pt, cnt)
+
+ rsp = self.send_cmd(cmd)[10:]
+ more_data, cap, cnt = struct.unpack('>BII', rsp[:9])
+ rsp = rsp[9:]
+
+ for i in range(0, cnt):
+ handle = struct.unpack('>I', rsp[:4])[0]
+ handles.append(handle)
+ rsp = rsp[4:]
+
+ return handles, more_data
+
+ def get_cap(self, cap, pt):
+ handles = []
+
+ more_data = True
+ while more_data:
+ next_handles, more_data = self.__get_cap_cnt(cap, pt, 1)
+ handles += next_handles
+ pt += 1
+
+ return handles
+
+ def get_cap_pcrs(self):
+ pcr_banks = {}
+
+ fmt = '>HII III'
+
+ cmd = struct.pack(fmt,
+ TPM2_ST_NO_SESSIONS,
+ struct.calcsize(fmt),
+ TPM2_CC_GET_CAPABILITY,
+ TPM2_CAP_PCRS, 0, 1)
+ rsp = self.send_cmd(cmd)[10:]
+ _, _, cnt = struct.unpack('>BII', rsp[:9])
+ rsp = rsp[9:]
+
+ # items are TPMS_PCR_SELECTION's
+ for i in range(0, cnt):
+ hash, sizeOfSelect = struct.unpack('>HB', rsp[:3])
+ rsp = rsp[3:]
+
+ pcrSelect = 0
+ if sizeOfSelect > 0:
+ pcrSelect, = struct.unpack('%ds' % sizeOfSelect,
+ rsp[:sizeOfSelect])
+ rsp = rsp[sizeOfSelect:]
+ pcrSelect = int.from_bytes(pcrSelect, byteorder='big')
+
+ pcr_banks[hash] = pcrSelect
+
+ return pcr_banks
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 19:11:55 +0000