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Code Issues Releases Wiki Activity

Merge pull request #538 from trezor/andrewkozlik/fido2-signcount

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Disable FIDO2 signature counter for some relying parties
This commit is contained in:
Pavol Rusnak 2019-09-19 17:00:51 +02:00 committed by GitHub
commit 68513a0b39
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GPG Key ID: 4AEE18F83AFDEB23
14 changed files with 127 additions and 59 deletions
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3
common/defs/webauthn/apps/binance.json
View File

@ -1,4 +1,5 @@
{
"label": "Binance",
"webauthn": "www.binance.com"
"webauthn": "www.binance.com",
"use_sign_count": false
}

4
common/defs/webauthn/apps/github.json
View File

@ -1,4 +1,6 @@
{
"label": "GitHub",
"u2f": "https://github.com/u2f/trusted_facets"
"u2f": "https://github.com/u2f/trusted_facets",
"webauthn": "github.com",
"use_sign_count": true
}

3
common/defs/webauthn/apps/microsoft.json
View File

@ -1,4 +1,5 @@
{
"label": "Microsoft",
"webauthn": "login.microsoft.com"
"webauthn": "login.microsoft.com",
"use_sign_count": false
}

16
common/defs/webauthn/gen.py
View File

@ -21,12 +21,22 @@ def gen_core(data):
for d in data:
if "u2f" in d:
url, label = d["u2f"], d["label"]
print(' "%s": "%s",' % (url, label))
print(' "%s": {"label": "%s", "use_sign_count": True},' % (url, label))
print(" # WebAuthn")
for d in data:
if "webauthn" in d:
origin, label = d["webauthn"], d["label"]
print(' "%s": "%s",' % (origin, label))
origin, label, use_sign_count = (
d["webauthn"],
d["label"],
d.get("use_sign_count", None),
)
if use_sign_count is None:
print(' "%s": {"label": "%s"},' % (origin, label))
else:
print(
' "%s": {"label": "%s", "use_sign_count": %s},'
% (origin, label, use_sign_count)
)
print("}")

1
common/protob/messages-webauthn.proto
View File

@ -52,5 +52,6 @@ message WebAuthnCredentials {
optional string user_display_name = 7;
optional uint32 creation_time = 8;
optional bool hmac_secret = 9;
optional bool use_sign_count = 10;
}
}

21
core/src/apps/webauthn/__init__.py
View File

@ -1152,18 +1152,20 @@ def msg_authenticate(req: Msg, dialog_mgr: DialogManager) -> Cmd:
# sign the authentication challenge and return
if __debug__:
log.info(__name__, "signing authentication")
buf = msg_authenticate_sign(auth.chal, auth.appId, cred.private_key())
buf = msg_authenticate_sign(auth.chal, auth.appId, cred)
dialog_mgr.reset()
return Cmd(req.cid, _CMD_MSG, buf)
def msg_authenticate_sign(challenge: bytes, rp_id_hash: bytes, privkey: bytes) -> bytes:
def msg_authenticate_sign(
challenge: bytes, rp_id_hash: bytes, cred: Credential
) -> bytes:
flags = bytes([_AUTH_FLAG_UP])
# get next counter
ctr = storage.device.next_u2f_counter()
ctr = cred.next_signature_counter()
ctrbuf = ustruct.pack(">L", ctr)
# hash input data together with counter
@ -1174,7 +1176,7 @@ def msg_authenticate_sign(challenge: bytes, rp_id_hash: bytes, privkey: bytes) -
dig.update(challenge) # uint8_t chal[32];
# sign the digest and convert to der
sig = nist256p1.sign(privkey, dig.digest(), False)
sig = nist256p1.sign(cred.private_key(), dig.digest(), False)
sig = der.encode_seq((sig[1:33], sig[33:]))
# pack to a response
@ -1206,6 +1208,8 @@ def cbor_error(cid: int, code: int) -> Cmd:
def cbor_make_credential(req: Cmd, dialog_mgr: DialogManager) -> Optional[Cmd]:
from apps.webauthn.knownapps import knownapps
if not storage.is_initialized():
if __debug__:
log.warning(__name__, "not initialized")
@ -1260,6 +1264,8 @@ def cbor_make_credential(req: Cmd, dialog_mgr: DialogManager) -> Optional[Cmd]:
except Exception:
return cbor_error(req.cid, _ERR_INVALID_CBOR)
cred.use_sign_count = knownapps.get(rp_id_hash, {}).get("use_sign_count", True)
# Check data types.
if (
not cred.check_data_types()
@ -1333,10 +1339,12 @@ def cbor_make_credential_sign(
extensions = cbor.encode({"hmac-secret": True})
flags |= _AUTH_FLAG_ED
ctr = cred.next_signature_counter()
authenticator_data = (
cred.rp_id_hash
+ bytes([flags])
+ b"\x00\x00\x00\x00"
+ ctr.to_bytes(4, "big")
+ att_cred_data
+ extensions
)
@ -1541,7 +1549,8 @@ def cbor_get_assertion_sign(
flags |= _AUTH_FLAG_ED
encoded_extensions = cbor.encode(extensions)
ctr = storage.device.next_u2f_counter() or 0
ctr = cred.next_signature_counter()
authenticator_data = (
rp_id_hash + bytes([flags]) + ctr.to_bytes(4, "big") + encoded_extensions
)

4
core/src/apps/webauthn/confirm.py
View File

@ -20,10 +20,10 @@ class ConfirmInfo:
def load_icon(self, rp_id_hash: bytes) -> None:
from trezor import res
from apps.webauthn import knownapps
from apps.webauthn.knownapps import knownapps
try:
namepart = knownapps.knownapps[rp_id_hash].lower().replace(" ", "_")
namepart = knownapps[rp_id_hash]["label"].lower().replace(" ", "_")
icon = res.load("apps/webauthn/res/icon_%s.toif" % namepart)
except Exception as e:
icon = res.load("apps/webauthn/res/icon_webauthn.toif")

33
core/src/apps/webauthn/credential.py
View File

@ -23,6 +23,7 @@ _CRED_ID_USER_NAME = const(0x04)
_CRED_ID_USER_DISPLAY_NAME = const(0x05)
_CRED_ID_CREATION_TIME = const(0x06)
_CRED_ID_HMAC_SECRET = const(0x07)
_CRED_ID_USE_SIGN_COUNT = const(0x08)
# Key paths
_U2F_KEY_PATH = const(0x80553246)
@ -30,7 +31,7 @@ _U2F_KEY_PATH = const(0x80553246)
class Credential:
def __init__(self) -> None:
self.index = None # type Optional[int]
self.index = None # type: Optional[int]
self.id = b"" # type: bytes
self.rp_id = "" # type: str
self.rp_id_hash = b"" # type: bytes
@ -48,6 +49,9 @@ class Credential:
def hmac_secret_key(self) -> Optional[bytes]:
return None
def next_signature_counter(self) -> int:
return storage.device.next_u2f_counter() or 0
@staticmethod
def from_bytes(data: bytes, rp_id_hash: bytes) -> Optional["Credential"]:
cred = Fido2Credential.from_cred_id(
@ -65,19 +69,20 @@ class Fido2Credential(Credential):
self.rp_name = None # type: Optional[str]
self.user_name = None # type: Optional[str]
self.user_display_name = None # type: Optional[str]
self._creation_time = 0 # type: int
self.creation_time = 0 # type: int
self.hmac_secret = False # type: bool
self.use_sign_count = False # type: bool
def __lt__(self, other: Credential) -> bool:
# Sort FIDO2 credentials newest first amongst each other.
if isinstance(other, Fido2Credential):
return self._creation_time > other._creation_time
return self.creation_time > other.creation_time
# Sort FIDO2 credentials before U2F credentials.
return True
def generate_id(self) -> None:
self._creation_time = storage.device.next_u2f_counter() or 0
self.creation_time = storage.device.next_u2f_counter() or 0
data = cbor.encode(
{
@ -88,8 +93,9 @@ class Fido2Credential(Credential):
(_CRED_ID_USER_ID, self.user_id),
(_CRED_ID_USER_NAME, self.user_name),
(_CRED_ID_USER_DISPLAY_NAME, self.user_display_name),
(_CRED_ID_CREATION_TIME, self._creation_time),
(_CRED_ID_CREATION_TIME, self.creation_time),
(_CRED_ID_HMAC_SECRET, self.hmac_secret),
(_CRED_ID_USE_SIGN_COUNT, self.use_sign_count),
)
if value
}
@ -148,8 +154,9 @@ class Fido2Credential(Credential):
cred.user_id = data.get(_CRED_ID_USER_ID, None)
cred.user_name = data.get(_CRED_ID_USER_NAME, None)
cred.user_display_name = data.get(_CRED_ID_USER_DISPLAY_NAME, None)
cred._creation_time = data.get(_CRED_ID_CREATION_TIME, 0)
cred.creation_time = data.get(_CRED_ID_CREATION_TIME, 0)
cred.hmac_secret = data.get(_CRED_ID_HMAC_SECRET, False)
cred.use_sign_count = data.get(_CRED_ID_USE_SIGN_COUNT, False)
cred.id = cred_id
if (
@ -165,7 +172,7 @@ class Fido2Credential(Credential):
return (
self.rp_id is not None
and self.user_id is not None
and self._creation_time is not None
and self.creation_time is not None
)
def check_data_types(self) -> bool:
@ -176,7 +183,8 @@ class Fido2Credential(Credential):
and isinstance(self.user_name, (str, type(None)))
and isinstance(self.user_display_name, (str, type(None)))
and isinstance(self.hmac_secret, bool)
and isinstance(self._creation_time, (int, type(None)))
and isinstance(self.use_sign_count, bool)
and isinstance(self.creation_time, (int, type(None)))
and isinstance(self.id, (bytes, bytearray))
)
@ -212,6 +220,11 @@ class Fido2Credential(Credential):
return node.key()
def next_signature_counter(self) -> int:
if not self.use_sign_count:
return 0
return super().next_signature_counter()
class U2fCredential(Credential):
def __init__(self) -> None:
@ -249,9 +262,9 @@ class U2fCredential(Credential):
self.id = keypath + mac.digest()
def app_name(self) -> str:
from apps.webauthn import knownapps
from apps.webauthn.knownapps import knownapps
app_name = knownapps.knownapps.get(self.rp_id_hash, None)
app_name = knownapps.get(self.rp_id_hash, {}).get("label", None)
if app_name is None:
app_name = "%s...%s" % (
hexlify(self.rp_id_hash[:4]).decode(),

72
core/src/apps/webauthn/knownapps.py
View File

@ -6,32 +6,54 @@ from trezor.crypto.hashlib import sha256
_knownapps = {
# U2F
"https://bitbucket.org": "Bitbucket",
"https://www.bitfinex.com": "Bitfinex",
"https://vault.bitwarden.com/app-id.json": "Bitwarden",
"https://www.dashlane.com": "Dashlane",
"https://www.dropbox.com/u2f-app-id.json": "Dropbox",
"https://api-9dcf9b83.duosecurity.com": "Duo",
"https://www.fastmail.com": "FastMail",
"https://id.fedoraproject.org/u2f-origins.json": "Fedora",
"https://account.gandi.net/api/u2f/trusted_facets.json": "Gandi",
"https://github.com/u2f/trusted_facets": "GitHub",
"https://gitlab.com": "GitLab",
"https://www.gstatic.com/securitykey/origins.json": "Google",
"https://keepersecurity.com": "Keeper",
"https://lastpass.com": "LastPass",
"https://slushpool.com/static/security/u2f.json": "Slush Pool",
"https://dashboard.stripe.com": "Stripe",
"https://u2f.bin.coffee": "u2f.bin.coffee",
"https://bitbucket.org": {"label": "Bitbucket", "use_sign_count": True},
"https://www.bitfinex.com": {"label": "Bitfinex", "use_sign_count": True},
"https://vault.bitwarden.com/app-id.json": {
"label": "Bitwarden",
"use_sign_count": True,
},
"https://www.dashlane.com": {"label": "Dashlane", "use_sign_count": True},
"https://www.dropbox.com/u2f-app-id.json": {
"label": "Dropbox",
"use_sign_count": True,
},
"https://api-9dcf9b83.duosecurity.com": {"label": "Duo", "use_sign_count": True},
"https://www.fastmail.com": {"label": "FastMail", "use_sign_count": True},
"https://id.fedoraproject.org/u2f-origins.json": {
"label": "Fedora",
"use_sign_count": True,
},
"https://account.gandi.net/api/u2f/trusted_facets.json": {
"label": "Gandi",
"use_sign_count": True,
},
"https://github.com/u2f/trusted_facets": {
"label": "GitHub",
"use_sign_count": True,
},
"https://gitlab.com": {"label": "GitLab", "use_sign_count": True},
"https://www.gstatic.com/securitykey/origins.json": {
"label": "Google",
"use_sign_count": True,
},
"https://keepersecurity.com": {"label": "Keeper", "use_sign_count": True},
"https://lastpass.com": {"label": "LastPass", "use_sign_count": True},
"https://slushpool.com/static/security/u2f.json": {
"label": "Slush Pool",
"use_sign_count": True,
},
"https://dashboard.stripe.com": {"label": "Stripe", "use_sign_count": True},
"https://u2f.bin.coffee": {"label": "u2f.bin.coffee", "use_sign_count": True},
# WebAuthn
"www.binance.com": "Binance",
"www.dropbox.com": "Dropbox",
"secure.login.gov": "login.gov",
"login.microsoft.com": "Microsoft",
"webauthn.bin.coffee": "webauthn.bin.coffee",
"webauthn.io": "WebAuthn.io",
"webauthn.me": "WebAuthn.me",
"demo.yubico.com": "demo.yubico.com",
"www.binance.com": {"label": "Binance", "use_sign_count": False},
"www.dropbox.com": {"label": "Dropbox"},
"github.com": {"label": "GitHub", "use_sign_count": True},
"secure.login.gov": {"label": "login.gov"},
"login.microsoft.com": {"label": "Microsoft", "use_sign_count": False},
"webauthn.bin.coffee": {"label": "webauthn.bin.coffee"},
"webauthn.io": {"label": "WebAuthn.io"},
"webauthn.me": {"label": "WebAuthn.me"},
"demo.yubico.com": {"label": "demo.yubico.com"},
}
knownapps = {sha256(k.encode()).digest(): v for (k, v) in _knownapps.items()}

3
core/src/apps/webauthn/list_resident_credentials.py
View File

@ -30,8 +30,9 @@ async def list_resident_credentials(
user_id=cred.user_id,
user_name=cred.user_name,
user_display_name=cred.user_display_name,
creation_time=cred._creation_time,
creation_time=cred.creation_time,
hmac_secret=cred.hmac_secret,
use_sign_count=cred.use_sign_count,
)
for cred in get_resident_credentials()
]

3
core/src/trezor/messages/WebAuthnCredential.py
View File

@ -23,6 +23,7 @@ class WebAuthnCredential(p.MessageType):
user_display_name: str = None,
creation_time: int = None,
hmac_secret: bool = None,
use_sign_count: bool = None,
) -> None:
self.index = index
self.id = id
@ -33,6 +34,7 @@ class WebAuthnCredential(p.MessageType):
self.user_display_name = user_display_name
self.creation_time = creation_time
self.hmac_secret = hmac_secret
self.use_sign_count = use_sign_count
@classmethod
def get_fields(cls) -> Dict:
@ -46,4 +48,5 @@ class WebAuthnCredential(p.MessageType):
7: ('user_display_name', p.UnicodeType, 0),
8: ('creation_time', p.UVarintType, 0),
9: ('hmac_secret', p.BoolType, 0),
10: ('use_sign_count', p.BoolType, 0),
}

2
core/tests/test_apps.webauthn.credential.py
View File

@ -49,7 +49,7 @@ class TestCredential(unittest.TestCase):
self.assertEqual(cred.rp_id_hash, rp_id_hash)
self.assertEqual(hexlify(cred.user_id), user_id)
self.assertEqual(cred.user_name, user_name)
self.assertEqual(cred._creation_time, 2)
self.assertEqual(cred.creation_time, creation_time)
self.assertTrue(cred.hmac_secret)
self.assertIsNone(cred.rp_name)
self.assertIsNone(cred.user_display_name)

18
python/src/trezorlib/cli/trezorctl.py
View File

@ -1976,20 +1976,22 @@ def webauthn_list_credentials(connect):
click.echo("")
click.echo("WebAuthn credential at index {}:".format(cred.index))
if cred.rp_id is not None:
click.echo(" Relying party ID: {}".format(cred.rp_id))
click.echo(" Relying party ID: {}".format(cred.rp_id))
if cred.rp_name is not None:
click.echo(" Relying party name: {}".format(cred.rp_name))
click.echo(" Relying party name: {}".format(cred.rp_name))
if cred.user_id is not None:
click.echo(" User ID: {}".format(cred.user_id.hex()))
click.echo(" User ID: {}".format(cred.user_id.hex()))
if cred.user_name is not None:
click.echo(" User name: {}".format(cred.user_name))
click.echo(" User name: {}".format(cred.user_name))
if cred.user_display_name is not None:
click.echo(" User display name: {}".format(cred.user_display_name))
click.echo(" User display name: {}".format(cred.user_display_name))
if cred.creation_time is not None:
click.echo(" Creation time: {}".format(cred.creation_time))
click.echo(" Creation time: {}".format(cred.creation_time))
if cred.hmac_secret is not None:
click.echo(" hmac-secret enabled: {}".format(cred.hmac_secret))
click.echo(" Credential ID: {}".format(cred.id.hex()))
click.echo(" hmac-secret enabled: {}".format(cred.hmac_secret))
if cred.use_sign_count is not None:
click.echo(" Use signature counter: {}".format(cred.use_sign_count))
click.echo(" Credential ID: {}".format(cred.id.hex()))
if not creds:
click.echo("There are no resident credentials stored on the device.")

3
python/src/trezorlib/messages/WebAuthnCredential.py
View File

@ -23,6 +23,7 @@ class WebAuthnCredential(p.MessageType):
user_display_name: str = None,
creation_time: int = None,
hmac_secret: bool = None,
use_sign_count: bool = None,
) -> None:
self.index = index
self.id = id
@ -33,6 +34,7 @@ class WebAuthnCredential(p.MessageType):
self.user_display_name = user_display_name
self.creation_time = creation_time
self.hmac_secret = hmac_secret
self.use_sign_count = use_sign_count
@classmethod
def get_fields(cls) -> Dict:
@ -46,4 +48,5 @@ class WebAuthnCredential(p.MessageType):
7: ('user_display_name', p.UnicodeType, 0),
8: ('creation_time', p.UVarintType, 0),
9: ('hmac_secret', p.BoolType, 0),
10: ('use_sign_count', p.BoolType, 0),
}