breakup test_fido2
This commit is contained in:
Conor Patrick
parent
c4262b0f5b
commit
0a7845459c
@ -17,6 +17,17 @@ from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from .tester import Tester, Test
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from .util import shannon_entropy
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rp = {"id": "examplo.org", "name": "ExaRP"}
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rp2 = {"id": "solokeys.com", "name": "ExaRP"}
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user = {"id": b"usee_od", "name": "AB User"}
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user1 = {"id": b"1234567890", "name": "Conor Patrick"}
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user2 = {"id": b"oiewhfoi", "name": "Han Solo"}
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user3 = {"id": b"23ohfpjwo@@", "name": "John Smith"}
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challenge = "Y2hhbGxlbmdl"
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pin_protocol = 1
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key_params = [{"type": "public-key", "alg": ES256.ALGORITHM}]
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cdh = b"123456789abcdef0123456789abcdef0"
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def VerifyAttestation(attest, data):
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verifier = Attestation.for_type(attest.fmt)
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@ -28,14 +39,11 @@ class FIDO2Tests(Tester):
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super().__init__(tester)
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def run(self,):
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self.test_fido2_other()
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self.test_fido2()
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def test_fido2_simple(self, pin_token=None):
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creds = []
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exclude_list = []
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rp = {"id": self.host, "name": "ExaRP"}
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user = {"id": b"usee_od", "name": "AB User"}
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challenge = "Y2hhbGxlbmdl"
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PIN = pin_token
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fake_id1 = array.array("B", [randint(0, 255) for i in range(0, 150)]).tobytes()
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@ -68,8 +76,6 @@ class FIDO2Tests(Tester):
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def test_fido2_brute_force(self):
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creds = []
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exclude_list = []
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rp = {"id": self.host, "name": "ExaRP"}
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user = {"id": b"usee_od", "name": "AB User"}
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PIN = None
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abc = "abcdefghijklnmopqrstuvwxyz"
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abc += abc.upper()
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@ -120,172 +126,9 @@ class FIDO2Tests(Tester):
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print("Assertion valid (%d ms)" % (t2 - t1))
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sys.stdout.flush()
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def test_fido2(self):
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def test(self, pincode=None):
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creds = []
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exclude_list = []
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rp = {"id": self.host, "name": "ExaRP"}
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user = {"id": b"usee_od", "name": "AB User"}
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challenge = "Y2hhbGxlbmdl"
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PIN = pincode
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fake_id1 = array.array(
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"B", [randint(0, 255) for i in range(0, 150)]
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).tobytes()
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fake_id2 = array.array(
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"B", [randint(0, 255) for i in range(0, 73)]
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).tobytes()
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exclude_list.append({"id": fake_id1, "type": "public-key"})
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exclude_list.append({"id": fake_id2, "type": "public-key"})
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# test make credential
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with Test("make %d credentials" % self.user_count):
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lastc = 0
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for i in range(0, self.user_count):
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attest, data = self.client.make_credential(
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rp, user, challenge, pin=PIN, exclude_list=[]
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)
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VerifyAttestation(attest, data)
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# verify counter is correct
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if lastc > 0:
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assert attest.auth_data.counter - lastc < 10
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assert attest.auth_data.counter - lastc > 0
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assert attest.auth_data.counter < 0x10000
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lastc = attest.auth_data.counter
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cred = attest.auth_data.credential_data
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creds.append(cred)
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print(cred)
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if PIN is not None:
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with Test("make credential with wrong pin code"):
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try:
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attest, data = self.client.make_credential(
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rp, user, challenge, pin=PIN + " ", exclude_list=[]
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)
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except CtapError as e:
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assert e.code == CtapError.ERR.PIN_INVALID
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except ClientError as e:
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assert e.cause.code == CtapError.ERR.PIN_INVALID
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with Test("make credential with exclude list"):
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attest, data = self.client.make_credential(
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rp, user, challenge, pin=PIN, exclude_list=exclude_list
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)
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VerifyAttestation(attest, data)
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cred = attest.auth_data.credential_data
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creds.append(cred)
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with Test("make credential with exclude list including real credential"):
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real_excl = [{"id": cred.credential_id, "type": "public-key"}]
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try:
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attest, data = self.client.make_credential(
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rp,
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user,
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challenge,
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pin=PIN,
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exclude_list=exclude_list + real_excl,
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)
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raise RuntimeError("Exclude list did not return expected error")
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except CtapError as e:
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assert e.code == CtapError.ERR.CREDENTIAL_EXCLUDED
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except ClientError as e:
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assert e.cause.code == CtapError.ERR.CREDENTIAL_EXCLUDED
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for i, x in enumerate(creds):
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with Test("get assertion %d" % i):
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allow_list = [{"id": x.credential_id, "type": "public-key"}]
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assertions, client_data = self.client.get_assertion(
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rp["id"], challenge, allow_list, pin=PIN
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)
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assertions[0].verify(client_data.hash, x.public_key)
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if PIN is not None:
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with Test("get assertion with wrong pin code"):
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try:
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assertions, client_data = self.client.get_assertion(
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rp["id"], challenge, allow_list, pin=PIN + " "
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)
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except CtapError as e:
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assert e.code == CtapError.ERR.PIN_INVALID
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except ClientError as e:
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assert e.cause.code == CtapError.ERR.PIN_INVALID
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with Test("get multiple assertions"):
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allow_list = [
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{"id": x.credential_id, "type": "public-key"} for x in creds
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]
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assertions, client_data = self.client.get_assertion(
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rp["id"], challenge, allow_list, pin=PIN
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)
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for ass, cred in zip(assertions, creds):
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i += 1
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ass.verify(client_data.hash, cred.public_key)
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print("%d verified" % i)
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with Test("Reset device"):
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try:
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self.ctap.reset()
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except CtapError as e:
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print("Warning, reset failed: ", e)
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pass
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test(self, None)
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with Test("Set a pin code"):
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PIN = "1122aabbwfg0h9g !@#=="
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self.client.pin_protocol.set_pin(PIN)
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with Test("Illegally set pin code again"):
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try:
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self.client.pin_protocol.set_pin(PIN)
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except CtapError as e:
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assert e.code == CtapError.ERR.NOT_ALLOWED
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with Test("Change pin code"):
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PIN2 = PIN + "_pin2"
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self.client.pin_protocol.change_pin(PIN, PIN2)
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PIN = PIN2
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with Test("Change pin code using wrong pin"):
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try:
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self.client.pin_protocol.change_pin(PIN.replace("a", "b"), "1234")
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except CtapError as e:
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assert e.code == CtapError.ERR.PIN_INVALID
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with Test("MC using wrong pin"):
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try:
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self.test_fido2_simple("abcd3")
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except ClientError as e:
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assert e.cause.code == CtapError.ERR.PIN_INVALID
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with Test("get info"):
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inf = self.ctap.get_info()
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self.test_fido2_simple(PIN)
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with Test("Re-run make_credential and get_assertion tests with pin code"):
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test(self, PIN)
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with Test("Reset device"):
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try:
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self.ctap.reset()
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except CtapError as e:
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print("Warning, reset failed: ", e)
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def test_extensions(self,):
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creds = []
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exclude_list = []
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rp = {"id": self.host, "name": "ExaRP"}
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user = {"id": b"usee_od", "name": "AB User"}
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challenge = "Y2hhbGxlbmdl"
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pin_protocol = 1
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key_params = [{"type": "public-key", "alg": ES256.ALGORITHM}]
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cdh = b"123456789abcdef0123456789abcdef0"
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salt1 = b"\x5a" * 32
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salt2 = b"\x96" * 32
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@ -439,33 +282,7 @@ class FIDO2Tests(Tester):
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expectedError=CtapError.ERR.INVALID_LENGTH,
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)
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def test_fido2_other(self,):
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creds = []
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exclude_list = []
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rp = {"id": self.host, "name": "ExaRP"}
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rp2 = {"id": "solokeys.com", "name": "ExaRP"}
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user = {"id": b"usee_od", "name": "AB User"}
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user1 = {"id": b"1234567890", "name": "Conor Patrick"}
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user2 = {"id": b"oiewhfoi", "name": "Han Solo"}
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user3 = {"id": b"23ohfpjwo@@", "name": "John Smith"}
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challenge = "Y2hhbGxlbmdl"
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pin_protocol = 1
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key_params = [{"type": "public-key", "alg": ES256.ALGORITHM}]
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cdh = b"123456789abcdef0123456789abcdef0"
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def reboot():
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if self.is_sim:
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print("Sending restart command...")
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self.send_magic_reboot()
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self.delay(0.25)
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else:
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print("Please reboot authentictor and hit enter")
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input()
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self.find_device()
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self.testReset()
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def test_get_info(self,):
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with Test("Get info"):
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info = self.ctap.get_info()
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@ -480,6 +297,31 @@ class FIDO2Tests(Tester):
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for x in info.options:
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assert info.options[x] in [True, False]
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if "uv" in info.options:
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if info.options["uv"]:
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self.testMC(
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"Send MC request with uv set to true, expect SUCCESS",
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cdh,
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rp,
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user,
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key_params,
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other={"options": {"uv": True}},
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expectedError=CtapError.ERR.SUCCESS,
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)
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if "up" in info.options:
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if info.options["up"]:
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self.testMC(
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"Send MC request with up set to true, expect INVALID_OPTION",
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cdh,
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rp,
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user,
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key_params,
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other={"options": {"up": True}},
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expectedError=CtapError.ERR.INVALID_OPTION,
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)
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def test_make_credential(self,):
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prev_reg = self.testMC(
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"Send MC request, expect success",
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cdh,
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@ -488,61 +330,17 @@ class FIDO2Tests(Tester):
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key_params,
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expectedError=CtapError.ERR.SUCCESS,
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)
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with Test("Check attestation format is correct"):
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assert prev_reg.fmt in ["packed", "tpm", "android-key", "adroid-safetynet"]
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with Test("Check auth_data is at least 77 bytes"):
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assert len(prev_reg.auth_data) >= 77
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allow_list = [
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{
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"id": prev_reg.auth_data.credential_data.credential_id,
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"type": "public-key",
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}
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]
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with Test("Check attestation format is correct"):
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assert prev_reg.fmt in ["packed", "tpm", "android-key", "adroid-safetynet"]
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prev_auth = self.testGA(
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"Send GA request, expect success",
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rp["id"],
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cdh,
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allow_list,
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expectedError=CtapError.ERR.SUCCESS,
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)
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with Test("Test auth_data is 37 bytes"):
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assert len(prev_auth.auth_data) == 37
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with Test("Test that auth_data.rpIdHash is correct"):
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assert sha256(rp["id"].encode()) == prev_auth.auth_data.rp_id_hash
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with Test("Check that AT flag is not set"):
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assert (prev_auth.auth_data.flags & 0xF8) == 0
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with Test("Test that user, credential and numberOfCredentials are not present"):
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assert prev_auth.user == None
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assert prev_auth.number_of_credentials == None
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self.testGA(
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"Send GA request with empty allow_list, expect NO_CREDENTIALS",
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rp["id"],
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cdh,
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[],
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expectedError=CtapError.ERR.NO_CREDENTIALS,
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)
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# apply bit flip
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badid = list(prev_reg.auth_data.credential_data.credential_id[:])
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badid[len(badid) // 2] = badid[len(badid) // 2] ^ 1
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badid = bytes(badid)
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self.testGA(
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"Send GA request with corrupt credId in allow_list, expect NO_CREDENTIALS",
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rp["id"],
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cdh,
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[{"id": badid, "type": "public-key"}],
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expectedError=CtapError.ERR.NO_CREDENTIALS,
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)
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with Test("Check auth_data is at least 77 bytes"):
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assert len(prev_reg.auth_data) >= 77
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self.testMC(
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"Send MC request with missing clientDataHash, expect error",
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@ -836,27 +634,76 @@ class FIDO2Tests(Tester):
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expectedError=CtapError.ERR.SUCCESS,
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)
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if "uv" in info.options:
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if info.options["uv"]:
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self.testMC(
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"Send MC request with uv set to true, expect SUCCESS",
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self.testReset()
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self.testGA(
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"Send GA request with reset auth, expect NO_CREDENTIALS",
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rp["id"],
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cdh,
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allow_list,
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expectedError=CtapError.ERR.NO_CREDENTIALS,
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)
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def test_get_assertion(self,):
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self.testReset()
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prev_reg = self.testMC(
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"Send MC request, expect success",
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cdh,
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rp,
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user,
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key_params,
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other={"options": {"uv": True}},
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expectedError=CtapError.ERR.SUCCESS,
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)
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if "up" in info.options:
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if info.options["up"]:
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self.testMC(
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"Send MC request with up set to true, expect INVALID_OPTION",
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allow_list = [
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{
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"id": prev_reg.auth_data.credential_data.credential_id,
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"type": "public-key",
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}
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]
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prev_auth = self.testGA(
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"Send GA request, expect success",
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rp["id"],
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cdh,
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rp,
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user,
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key_params,
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other={"options": {"up": True}},
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expectedError=CtapError.ERR.INVALID_OPTION,
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allow_list,
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expectedError=CtapError.ERR.SUCCESS,
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)
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with Test("Test auth_data is 37 bytes"):
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assert len(prev_auth.auth_data) == 37
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with Test("Test that auth_data.rpIdHash is correct"):
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assert sha256(rp["id"].encode()) == prev_auth.auth_data.rp_id_hash
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with Test("Check that AT flag is not set"):
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assert (prev_auth.auth_data.flags & 0xF8) == 0
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with Test("Test that user, credential and numberOfCredentials are not present"):
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assert prev_auth.user == None
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assert prev_auth.number_of_credentials == None
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self.testGA(
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"Send GA request with empty allow_list, expect NO_CREDENTIALS",
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rp["id"],
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cdh,
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[],
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expectedError=CtapError.ERR.NO_CREDENTIALS,
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)
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# apply bit flip
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badid = list(prev_reg.auth_data.credential_data.credential_id[:])
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badid[len(badid) // 2] = badid[len(badid) // 2] ^ 1
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badid = bytes(badid)
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self.testGA(
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"Send GA request with corrupt credId in allow_list, expect NO_CREDENTIALS",
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rp["id"],
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cdh,
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[{"id": badid, "type": "public-key"}],
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expectedError=CtapError.ERR.NO_CREDENTIALS,
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)
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self.testGA(
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@ -911,6 +758,8 @@ class FIDO2Tests(Tester):
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other={"options": {"unknown": True}},
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expectedError=CtapError.ERR.SUCCESS,
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)
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with Test("Get info"):
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info = self.ctap.get_info()
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if "uv" in info.options:
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if info.options["uv"]:
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@ -973,16 +822,7 @@ class FIDO2Tests(Tester):
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allow_list + [{"type": b"public-key"}],
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)
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self.testReset()
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def testRk(pin_code=None):
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self.testGA(
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"Send GA request with reset auth, expect NO_CREDENTIALS",
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rp["id"],
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cdh,
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allow_list,
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expectedError=CtapError.ERR.NO_CREDENTIALS,
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)
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def test_rk(self, pin_code=None):
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pin_auth = None
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if pin_code:
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@ -1001,6 +841,9 @@ class FIDO2Tests(Tester):
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expectedError=CtapError.ERR.SUCCESS,
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)
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with Test("Get info"):
|
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info = self.ctap.get_info()
|
||||
|
||||
options = {"rk": True}
|
||||
if "uv" in info.options and info.options["uv"]:
|
||||
options["uv"] = False
|
||||
@ -1051,11 +894,9 @@ class FIDO2Tests(Tester):
|
||||
except CtapError as e:
|
||||
print(e)
|
||||
|
||||
testRk(None)
|
||||
#
|
||||
# print("Assuming authenticator does NOT have a display.")
|
||||
def test_client_pin(self,):
|
||||
pin1 = "1234567890"
|
||||
testRk("1234567890")
|
||||
self.test_rk(pin1)
|
||||
|
||||
# PinProtocolV1
|
||||
res = self.testCP(
|
||||
@ -1116,14 +957,6 @@ class FIDO2Tests(Tester):
|
||||
self.client.pin_protocol.set_pin(pin1)
|
||||
|
||||
self.testReset()
|
||||
|
||||
# print("Setting pin code <4 bytes, expect POLICY_VIOLATION ")
|
||||
# try:
|
||||
# self.client.pin_protocol.set_pin("123")
|
||||
# except CtapError as e:
|
||||
# assert e.code == CtapError.ERR.POLICY_VIOLATION
|
||||
# print("Pass")
|
||||
|
||||
with Test("Setting pin code >63 bytes, expect POLICY_VIOLATION "):
|
||||
try:
|
||||
self.client.pin_protocol.set_pin("A" * 64)
|
||||
@ -1212,7 +1045,7 @@ class FIDO2Tests(Tester):
|
||||
expectedError=CtapError.ERR.PIN_AUTH_BLOCKED,
|
||||
)
|
||||
|
||||
reboot()
|
||||
self.reboot()
|
||||
|
||||
with Test("Get pin_token, expect SUCCESS"):
|
||||
pin_token = self.client.pin_protocol.get_pin_token(pin1)
|
||||
@ -1253,7 +1086,7 @@ class FIDO2Tests(Tester):
|
||||
assert res[3] == attempts
|
||||
|
||||
if err == CtapError.ERR.PIN_AUTH_BLOCKED:
|
||||
reboot()
|
||||
self.reboot()
|
||||
|
||||
res_mc = self.testMC(
|
||||
"Send MC request with correct pin_auth, expect PIN_BLOCKED",
|
||||
@ -1265,7 +1098,7 @@ class FIDO2Tests(Tester):
|
||||
expectedError=CtapError.ERR.PIN_BLOCKED,
|
||||
)
|
||||
|
||||
reboot()
|
||||
self.reboot()
|
||||
|
||||
self.testPP(
|
||||
"Get pin_token with correct pin code, expect PIN_BLOCKED",
|
||||
@ -1273,79 +1106,94 @@ class FIDO2Tests(Tester):
|
||||
expectedError=CtapError.ERR.PIN_BLOCKED,
|
||||
)
|
||||
|
||||
def test_fido2(self,):
|
||||
|
||||
creds = []
|
||||
exclude_list = []
|
||||
|
||||
self.test_get_info()
|
||||
|
||||
self.test_get_assertion()
|
||||
|
||||
self.test_make_credential()
|
||||
|
||||
self.test_rk(None)
|
||||
|
||||
self.test_client_pin()
|
||||
|
||||
self.testReset()
|
||||
|
||||
print("Done")
|
||||
|
||||
def test_rk(self,):
|
||||
creds = []
|
||||
rp = {"id": self.host, "name": "ExaRP"}
|
||||
|
||||
users = [
|
||||
{"id": b"user" + os.urandom(16), "name": "Username%d" % i}
|
||||
for i in range(0, self.user_count)
|
||||
]
|
||||
challenge = "Y2hhbGxlbmdl"
|
||||
PIN = None
|
||||
self.ctap.reset()
|
||||
# if PIN: self.client.pin_protocol.set_pin(PIN)
|
||||
|
||||
with Test("registering 1 user with RK"):
|
||||
t1 = time.time() * 1000
|
||||
attest, data = self.client.make_credential(
|
||||
rp, users[-1], challenge, pin=PIN, exclude_list=[], rk=True
|
||||
)
|
||||
t2 = time.time() * 1000
|
||||
VerifyAttestation(attest, data)
|
||||
creds.append(attest.auth_data.credential_data)
|
||||
|
||||
with Test("1 assertion"):
|
||||
t1 = time.time() * 1000
|
||||
assertions, client_data = self.client.get_assertion(
|
||||
rp["id"], challenge, pin=PIN
|
||||
)
|
||||
t2 = time.time() * 1000
|
||||
assertions[0].verify(client_data.hash, creds[0].public_key)
|
||||
|
||||
with Test("registering %d users with RK" % len(users)):
|
||||
for i in range(0, len(users) - 1):
|
||||
t1 = time.time() * 1000
|
||||
attest, data = self.client.make_credential(
|
||||
rp, users[i], challenge, pin=PIN, exclude_list=[], rk=True
|
||||
)
|
||||
t2 = time.time() * 1000
|
||||
VerifyAttestation(attest, data)
|
||||
creds.append(attest.auth_data.credential_data)
|
||||
|
||||
t1 = time.time() * 1000
|
||||
assertions, client_data = self.client.get_assertion(
|
||||
rp["id"], challenge, pin=PIN
|
||||
)
|
||||
t2 = time.time() * 1000
|
||||
|
||||
print("Got %d assertions for %d users" % (len(assertions), len(users)))
|
||||
assert len(assertions) == len(users)
|
||||
|
||||
for x, y in zip(assertions, creds):
|
||||
x.verify(client_data.hash, y.public_key)
|
||||
|
||||
print("Assertion(s) valid (%d ms)" % (t2 - t1))
|
||||
|
||||
with Test("register a duplicate user "):
|
||||
t1 = time.time() * 1000
|
||||
attest, data = self.client.make_credential(
|
||||
rp, users[1], challenge, pin=PIN, exclude_list=[], rk=True
|
||||
)
|
||||
t2 = time.time() * 1000
|
||||
VerifyAttestation(attest, data)
|
||||
creds = creds[:2] + creds[3:] + [attest.auth_data.credential_data]
|
||||
|
||||
t1 = time.time() * 1000
|
||||
assertions, client_data = self.client.get_assertion(
|
||||
rp["id"], challenge, pin=PIN
|
||||
)
|
||||
t2 = time.time() * 1000
|
||||
with Test("check %d assertions, %d users" % (len(assertions), len(users))):
|
||||
assert len(assertions) == len(users)
|
||||
for x, y in zip(assertions, creds):
|
||||
x.verify(client_data.hash, y.public_key)
|
||||
# def test_rk(self,):
|
||||
# creds = []
|
||||
# rp = {"id": self.host, "name": "ExaRP"}
|
||||
#
|
||||
# users = [
|
||||
# {"id": b"user" + os.urandom(16), "name": "Username%d" % i}
|
||||
# for i in range(0, self.user_count)
|
||||
# ]
|
||||
# challenge = "Y2hhbGxlbmdl"
|
||||
# PIN = None
|
||||
# self.ctap.reset()
|
||||
# # if PIN: self.client.pin_protocol.set_pin(PIN)
|
||||
#
|
||||
# with Test("registering 1 user with RK"):
|
||||
# t1 = time.time() * 1000
|
||||
# attest, data = self.client.make_credential(
|
||||
# rp, users[-1], challenge, pin=PIN, exclude_list=[], rk=True
|
||||
# )
|
||||
# t2 = time.time() * 1000
|
||||
# VerifyAttestation(attest, data)
|
||||
# creds.append(attest.auth_data.credential_data)
|
||||
#
|
||||
# with Test("1 assertion"):
|
||||
# t1 = time.time() * 1000
|
||||
# assertions, client_data = self.client.get_assertion(
|
||||
# rp["id"], challenge, pin=PIN
|
||||
# )
|
||||
# t2 = time.time() * 1000
|
||||
# assertions[0].verify(client_data.hash, creds[0].public_key)
|
||||
#
|
||||
# with Test("registering %d users with RK" % len(users)):
|
||||
# for i in range(0, len(users) - 1):
|
||||
# t1 = time.time() * 1000
|
||||
# attest, data = self.client.make_credential(
|
||||
# rp, users[i], challenge, pin=PIN, exclude_list=[], rk=True
|
||||
# )
|
||||
# t2 = time.time() * 1000
|
||||
# VerifyAttestation(attest, data)
|
||||
# creds.append(attest.auth_data.credential_data)
|
||||
#
|
||||
# t1 = time.time() * 1000
|
||||
# assertions, client_data = self.client.get_assertion(
|
||||
# rp["id"], challenge, pin=PIN
|
||||
# )
|
||||
# t2 = time.time() * 1000
|
||||
#
|
||||
# print("Got %d assertions for %d users" % (len(assertions), len(users)))
|
||||
# assert len(assertions) == len(users)
|
||||
#
|
||||
# for x, y in zip(assertions, creds):
|
||||
# x.verify(client_data.hash, y.public_key)
|
||||
#
|
||||
# print("Assertion(s) valid (%d ms)" % (t2 - t1))
|
||||
#
|
||||
# with Test("register a duplicate user "):
|
||||
# t1 = time.time() * 1000
|
||||
# attest, data = self.client.make_credential(
|
||||
# rp, users[1], challenge, pin=PIN, exclude_list=[], rk=True
|
||||
# )
|
||||
# t2 = time.time() * 1000
|
||||
# VerifyAttestation(attest, data)
|
||||
# creds = creds[:2] + creds[3:] + [attest.auth_data.credential_data]
|
||||
#
|
||||
# t1 = time.time() * 1000
|
||||
# assertions, client_data = self.client.get_assertion(
|
||||
# rp["id"], challenge, pin=PIN
|
||||
# )
|
||||
# t2 = time.time() * 1000
|
||||
# with Test("check %d assertions, %d users" % (len(assertions), len(users))):
|
||||
# assert len(assertions) == len(users)
|
||||
# for x, y in zip(assertions, creds):
|
||||
# x.verify(client_data.hash, y.public_key)
|
||||
|
||||
@ -73,6 +73,16 @@ class Tester:
|
||||
def set_sim(self, b):
|
||||
self.is_sim = b
|
||||
|
||||
def reboot(self,):
|
||||
if self.is_sim:
|
||||
print("Sending restart command...")
|
||||
self.send_magic_reboot()
|
||||
self.delay(0.25)
|
||||
else:
|
||||
print("Please reboot authentictor and hit enter")
|
||||
input()
|
||||
self.find_device()
|
||||
|
||||
def send_data(self, cmd, data):
|
||||
if type(data) != type(b""):
|
||||
data = struct.pack("%dB" % len(data), *[ord(x) for x in data])
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user