Skip to content

Added option clockSkewInSeconds to allow setting clock_skew_in_seconds parameter for token verification #625

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 4 commits into from
Closed

Added option clockSkewInSeconds to allow setting clock_skew_in_seconds parameter for token verification #625

Show file tree
Hide file tree
Changes from 2 commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
e38f71a
Added clock_skew_in_seconds to token verification
fschaeck Jul 14, 2022
4d14005
Added new app option clockSkewInSeconds
fschaeck Aug 6, 2022
a13a683
Merge branch 'master' into clock_skew
fschaeck Sep 13, 2022
a9a0fe7
Merge branch 'master' into clock_skew
fschaeck Dec 3, 2022
File filter

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 5 additions & 4 deletions firebase_admin/__init__.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@

_DEFAULT_APP_NAME = '[DEFAULT]'
_FIREBASE_CONFIG_ENV_VAR = 'FIREBASE_CONFIG'
_CONFIG_VALID_KEYS = ['databaseAuthVariableOverride', 'databaseURL', 'httpTimeout', 'projectId',
_CONFIG_VALID_KEYS = ['clockSkewInSeconds', 'databaseAuthVariableOverride', 'databaseURL', 'httpTimeout', 'projectId',
'storageBucket']

def initialize_app(credential=None, options=None, name=_DEFAULT_APP_NAME):
Expand All @@ -48,9 +48,10 @@ def initialize_app(credential=None, options=None, name=_DEFAULT_APP_NAME):
credential: A credential object used to initialize the SDK (optional). If none is provided,
Google Application Default Credentials are used.
options: A dictionary of configuration options (optional). Supported options include
``databaseURL``, ``storageBucket``, ``projectId``, ``databaseAuthVariableOverride``,
``serviceAccountId`` and ``httpTimeout``. If ``httpTimeout`` is not set, the SDK
uses a default timeout of 120 seconds.
``clockSkewInSeconds``, ``databaseURL``, ``storageBucket``, ``projectId``,
``databaseAuthVariableOverride``, ``serviceAccountId`` and ``httpTimeout``.
If ``httpTimeout`` is not set, the SDK uses a default timeout of 120 seconds.
If ``clockSkewInSeconds`` is not set, 0 is used when verifying a token.
name: Name of the app (optional).
Returns:
App: A newly initialized instance of App.
Expand Down
7 changes: 6 additions & 1 deletion firebase_admin/_token_gen.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,7 @@
'service-accounts/default/email')
ALGORITHM_RS256 = 'RS256'
ALGORITHM_NONE = 'none'
DEFAULT_CLOCK_SKEW_IN_SECONDS = 0

# Emulator fake account
AUTH_EMULATOR_EMAIL = 'firebase-auth-emulator@example.com'
Expand Down Expand Up @@ -271,13 +272,15 @@ class TokenVerifier:

def __init__(self, app):
timeout = app.options.get('httpTimeout', _http_client.DEFAULT_TIMEOUT_SECONDS)
clock_skew_in_seconds = app.options.get('clockSkewInSeconds', DEFAULT_CLOCK_SKEW_IN_SECONDS)
self.request = CertificateFetchRequest(timeout)
self.id_token_verifier = _JWTVerifier(
project_id=app.project_id, short_name='ID token',
operation='verify_id_token()',
doc_url='https://firebase.google.com/docs/auth/admin/verify-id-tokens',
cert_url=ID_TOKEN_CERT_URI,
issuer=ID_TOKEN_ISSUER_PREFIX,
clock_skew_in_seconds=clock_skew_in_seconds,
invalid_token_error=_auth_utils.InvalidIdTokenError,
expired_token_error=ExpiredIdTokenError)
self.cookie_verifier = _JWTVerifier(
Expand Down Expand Up @@ -312,6 +315,7 @@ def __init__(self, **kwargs):
self.articled_short_name = 'a {0}'.format(self.short_name)
self._invalid_token_error = kwargs.pop('invalid_token_error')
self._expired_token_error = kwargs.pop('expired_token_error')
self._clock_skew_in_seconds = kwargs.pop('clock_skew_in_seconds',DEFAULT_CLOCK_SKEW_IN_SECONDS)

def verify(self, token, request):
"""Verifies the signature and data for the provided JWT."""
Expand Down Expand Up @@ -393,7 +397,8 @@ def verify(self, token, request):
token,
request=request,
audience=self.project_id,
certs_url=self.cert_url)
certs_url=self.cert_url,
clock_skew_in_seconds=self._clock_skew_in_seconds)
verified_claims['uid'] = verified_claims['sub']
return verified_claims
except google.auth.exceptions.TransportError as error:
Expand Down