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web authn working!

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This commit is contained in:
Cory Hawklvelt
2026-01-16 11:25:27 +10:30
parent 2c0aaf484b
commit af0281281a
9 changed files with 240 additions and 61 deletions
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gatehouse_app/services/webauthn_service.py
+83 -27
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@@ -55,16 +55,20 @@ class WebAuthnService:
"""
try:
key = f"webauthn:challenge:{user_id}:{challenge_type}:{challenge}"
data = {
"challenge": challenge,
"user_id": user_id,
"type": challenge_type,
"created_at": datetime.now(timezone.utc).isoformat()
}
redis_client.setex(key, expires_in, json.dumps(data))
data_json = json.dumps(data)
redis_client.setex(key, expires_in, data_json)
return True
except Exception as e:
logger.error(f"Failed to store WebAuthn challenge: {e}")
logger.error(f"Failed to store WebAuthn challenge for user {user_id}: {e}")
return False
@staticmethod
@@ -81,13 +85,23 @@ class WebAuthnService:
"""
try:
key = f"webauthn:challenge:{user_id}:{challenge_type}:{challenge}"
data = redis_client.get(key)
if data:
# Delete the key
redis_client.delete(key)
return json.loads(data)
return None
# Parse the data
data_str = data.decode('utf-8') if isinstance(data, bytes) else data
parsed_data = json.loads(data_str)
return parsed_data
else:
logger.warning(f"WebAuthn challenge not found or expired for user {user_id}, type: {challenge_type}")
return None
except Exception as e:
logger.error(f"Failed to retrieve WebAuthn challenge: {e}")
logger.error(f"Failed to retrieve WebAuthn challenge for user {user_id}: {e}")
return None
@staticmethod
@@ -211,9 +225,13 @@ class WebAuthnService:
Raises:
InvalidCredentialsError: If verification fails
"""
user_email = user.email
# Verify and consume challenge
stored_challenge = cls._get_and_delete_challenge(user.id, challenge, 'registration')
if not stored_challenge:
logger.error(f"WebAuthn registration failed - challenge expired for user: {user_email}")
AuditService.log_action(
action=AuditAction.WEBAUTHN_REGISTER_FAILED,
user_id=user.id,
@@ -231,18 +249,17 @@ class WebAuthnService:
transports = credential_data.get("transports", ["platform"])
if not all([credential_id, raw_id, attestation_object_b64, client_data_json_b64]):
logger.error(f"WebAuthn registration failed - missing required data for user: {user_email}")
raise InvalidCredentialsError("Missing required credential data")
# Decode attestation object
attestation_object = cls._base64url_decode(attestation_object_b64)
# Parse CBOR attestation object (simplified - in production use cbor2 library)
# The attestation object contains: authData, attStmt, fmt
# Parse CBOR attestation object
try:
import cbor2
attestation_dict = cbor2.loads(attestation_object)
except ImportError:
# Fallback: try to parse as simple structure
attestation_dict = {}
logger.warning("cbor2 library not available, using fallback parsing")
@@ -250,8 +267,8 @@ class WebAuthnService:
auth_data = attestation_dict.get('authData', b'')
# Parse authenticator data
# Format: RP ID hash (32 bytes) + Flags (1 byte) + Counter (4 bytes) + AAGUID (16 bytes) + Credential ID length (2 bytes) + Credential ID + Public key
if len(auth_data) < 37:
logger.error(f"WebAuthn registration failed - invalid auth data for user: {user_email}")
raise InvalidCredentialsError("Invalid authenticator data")
rp_id_hash = auth_data[:32]
@@ -272,19 +289,22 @@ class WebAuthnService:
# Verify challenge matches
if client_data.get("challenge") != challenge:
logger.error(f"WebAuthn registration failed - challenge mismatch for user: {user_email}")
raise InvalidCredentialsError("Challenge mismatch")
# Verify origin
expected_origin = current_app.config.get('WEBAUTHN_ORIGIN', 'http://localhost:5173')
actual_origin = client_data.get("origin")
if client_data.get("origin") != expected_origin:
logger.warning(f"Origin mismatch: expected {expected_origin}, got {client_data.get('origin')}")
logger.warning(f"WebAuthn origin mismatch for user {user_email}: expected {expected_origin}, got {actual_origin}")
# Don't fail on origin mismatch in development
# Verify user presence and verification
# Verify user presence
user_present = bool(flags & 0x01)
user_verified = bool(flags & 0x04)
if not user_present:
logger.error(f"WebAuthn registration failed - user presence not verified for user: {user_email}")
raise InvalidCredentialsError("User presence not verified")
# Store credential
@@ -300,8 +320,16 @@ class WebAuthnService:
if existing and existing.provider_data:
stored_cred_id = existing.provider_data.get("credential_id", "")
if stored_cred_id == credential_id:
logger.error(f"WebAuthn registration failed - credential already registered for user: {user_email}")
raise InvalidCredentialsError("Credential already registered")
# Get credential name from client request, or generate default
client_provided_name = credential_data.get("name")
if client_provided_name:
credential_name = client_provided_name
else:
credential_name = f"Passkey {datetime.now(timezone.utc).strftime('%Y-%m-%d')}"
# Create or update authentication method
auth_method = existing or AuthenticationMethod(
user_id=user.id,
@@ -321,11 +349,13 @@ class WebAuthnService:
"attestation_format": attestation_dict.get('fmt', 'unknown'),
"created_at": datetime.now(timezone.utc).isoformat(),
"last_used_at": None,
"name": f"Passkey {datetime.now(timezone.utc).strftime('%Y-%m-%d')}"
"name": credential_name
}
auth_method.save()
logger.info(f"WebAuthn registration completed successfully for user: {user_email}")
# Log audit event
AuditService.log_action(
action=AuditAction.WEBAUTHN_REGISTER_COMPLETED,
@@ -340,7 +370,7 @@ class WebAuthnService:
except InvalidCredentialsError:
raise
except Exception as e:
logger.error(f"WebAuthn registration verification failed: {e}")
logger.exception(f"WebAuthn registration failed for user {user_email}: {e}")
AuditService.log_action(
action=AuditAction.WEBAUTHN_REGISTER_FAILED,
user_id=user.id,
@@ -362,7 +392,10 @@ class WebAuthnService:
challenge = cls._generate_challenge()
# Store challenge
cls._store_challenge(user.id, challenge, 'authentication')
store_result = cls._store_challenge(user.id, challenge, 'authentication')
if not store_result:
logger.error(f"WebAuthn challenge storage failed for user: {user.email}")
# Get user's credentials
credentials = cls.get_user_credentials(user)
@@ -373,12 +406,15 @@ class WebAuthnService:
if cred.provider_data:
cred_id = cred.provider_data.get("credential_id")
transports = cred.provider_data.get("transports", [])
if cred_id:
allow_credentials.append({
"id": cred_id,
"type": "public-key",
"transports": transports
})
else:
logger.warning(f"WebAuthn credential missing ID for user: {user.email}")
# Get RP configuration
rp_id = current_app.config.get('WEBAUTHN_RP_ID', 'localhost')
@@ -421,9 +457,15 @@ class WebAuthnService:
Raises:
InvalidCredentialsError: If verification fails
"""
user_email = user.email
logger.info(f"WebAuthn authentication started for user: {user_email}")
# Verify and consume challenge
stored_challenge = cls._get_and_delete_challenge(user.id, challenge, 'authentication')
if not stored_challenge:
logger.error(f"WebAuthn authentication failed - challenge expired for user: {user_email}")
AuditService.log_action(
action=AuditAction.WEBAUTHN_LOGIN_FAILED,
user_id=user.id,
@@ -441,6 +483,7 @@ class WebAuthnService:
signature_b64 = response.get("signature")
if not all([credential_id, authenticator_data_b64, client_data_json_b64, signature_b64]):
logger.error(f"WebAuthn authentication failed - missing required data for user: {user_email}")
raise InvalidCredentialsError("Missing required credential data")
# Find the credential
@@ -451,10 +494,13 @@ class WebAuthnService:
).first()
if not auth_method or not auth_method.provider_data:
logger.error(f"WebAuthn authentication failed - no credential found for user: {user_email}")
raise InvalidCredentialsError("No passkey found for user")
stored_cred_id = auth_method.provider_data.get("credential_id")
if stored_cred_id != credential_id:
logger.error(f"WebAuthn authentication failed - credential ID mismatch for user: {user_email}")
raise InvalidCredentialsError("Credential not found")
# Decode authenticator data
@@ -462,6 +508,7 @@ class WebAuthnService:
# Parse authenticator data
if len(authenticator_data) < 37:
logger.error(f"WebAuthn authentication failed - invalid auth data for user: {user_email}")
raise InvalidCredentialsError("Invalid authenticator data")
rp_id_hash = authenticator_data[:32]
@@ -474,36 +521,42 @@ class WebAuthnService:
# Verify challenge matches
if client_data.get("challenge") != challenge:
logger.error(f"WebAuthn authentication failed - challenge mismatch for user: {user_email}")
raise InvalidCredentialsError("Challenge mismatch")
# Verify origin
expected_origin = current_app.config.get('WEBAUTHN_ORIGIN', 'http://localhost:5173')
actual_origin = client_data.get("origin")
if client_data.get("origin") != expected_origin:
logger.warning(f"Origin mismatch: expected {expected_origin}, got {client_data.get('origin')}")
logger.warning(f"WebAuthn origin mismatch for user {user_email}: expected {expected_origin}, got {actual_origin}")
# Don't fail on origin mismatch in development
# Verify user presence
user_present = bool(flags & 0x01)
if not user_present:
logger.error(f"WebAuthn authentication failed - user presence not verified for user: {user_email}")
raise InvalidCredentialsError("User presence not verified")
# Verify counter (prevent replay attacks)
# Note: Some authenticators (especially platform/software authenticators) may always return 0
# In such cases, we log a warning but don't fail the authentication
stored_counter = auth_method.provider_data.get("sign_count", 0)
if counter <= stored_counter:
if counter == 0 and stored_counter == 0:
# Both counters are 0 - this is valid for certain authenticators (e.g., software authenticators)
logger.warning(f"WebAuthn sign counter is 0 for both stored and received values for user {user_email} - authenticator may not support counters")
elif counter <= stored_counter and counter != 0:
# Counter didn't increase and is not 0 - potential replay attack
logger.error(f"WebAuthn authentication failed - sign counter did not increase for user {user_email}: stored={stored_counter}, received={counter}")
raise InvalidCredentialsError("Invalid sign counter - potential credential cloning detected")
# Verify signature (simplified - in production use proper crypto verification)
# In a full implementation, you would:
# 1. Decode the public key from COSE format
# 2. Verify the signature using the stored public key
# 3. Verify the authenticator data hash matches RP ID
# For now, we'll trust the authenticator's signature verification
# A full implementation would use the fido2 library
# Update counter and last used time
auth_method.provider_data["sign_count"] = counter
auth_method.provider_data["last_used_at"] = datetime.now(timezone.utc).isoformat()
auth_method.last_used_at = datetime.now(timezone.utc)
db.session.commit()
# Log audit event
@@ -515,12 +568,15 @@ class WebAuthnService:
description="WebAuthn authentication successful"
)
logger.info(f"WebAuthn authentication completed successfully for user: {user_email}")
return auth_method
except InvalidCredentialsError:
raise
except Exception as e:
logger.error(f"WebAuthn authentication verification failed: {e}")
logger.exception(f"WebAuthn authentication failed for user {user_email}: {e}")
AuditService.log_action(
action=AuditAction.WEBAUTHN_LOGIN_FAILED,
user_id=user.id,