-
Notifications
You must be signed in to change notification settings - Fork 1.4k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
3 changed files
with
93 additions
and
82 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| from __future__ import absolute_import | ||
|
|
||
| import base64 | ||
| import hashlib | ||
| import hmac | ||
| import uuid | ||
|
|
||
| from kafka.vendor import six | ||
|
|
||
|
|
||
| if six.PY2: | ||
| def xor_bytes(left, right): | ||
| return bytearray(ord(lb) ^ ord(rb) for lb, rb in zip(left, right)) | ||
| else: | ||
| def xor_bytes(left, right): | ||
| return bytes(lb ^ rb for lb, rb in zip(left, right)) | ||
|
|
||
|
|
||
| class ScramClient: | ||
| MECHANISMS = { | ||
| 'SCRAM-SHA-256': hashlib.sha256, | ||
| 'SCRAM-SHA-512': hashlib.sha512 | ||
| } | ||
|
|
||
| def __init__(self, user, password, mechanism): | ||
| self.nonce = str(uuid.uuid4()).replace('-', '') | ||
| self.auth_message = '' | ||
| self.salted_password = None | ||
| self.user = user | ||
| self.password = password.encode('utf-8') | ||
| self.hashfunc = self.MECHANISMS[mechanism] | ||
| self.hashname = ''.join(mechanism.lower().split('-')[1:3]) | ||
| self.stored_key = None | ||
| self.client_key = None | ||
| self.client_signature = None | ||
| self.client_proof = None | ||
| self.server_key = None | ||
| self.server_signature = None | ||
|
|
||
| def first_message(self): | ||
| client_first_bare = 'n={},r={}'.format(self.user, self.nonce) | ||
| self.auth_message += client_first_bare | ||
| return 'n,,' + client_first_bare | ||
|
|
||
| def process_server_first_message(self, server_first_message): | ||
| self.auth_message += ',' + server_first_message | ||
| params = dict(pair.split('=', 1) for pair in server_first_message.split(',')) | ||
| server_nonce = params['r'] | ||
| if not server_nonce.startswith(self.nonce): | ||
| raise ValueError("Server nonce, did not start with client nonce!") | ||
| self.nonce = server_nonce | ||
| self.auth_message += ',c=biws,r=' + self.nonce | ||
|
|
||
| salt = base64.b64decode(params['s'].encode('utf-8')) | ||
| iterations = int(params['i']) | ||
| self.create_salted_password(salt, iterations) | ||
|
|
||
| self.client_key = self.hmac(self.salted_password, b'Client Key') | ||
| self.stored_key = self.hashfunc(self.client_key).digest() | ||
| self.client_signature = self.hmac(self.stored_key, self.auth_message.encode('utf-8')) | ||
| self.client_proof = xor_bytes(self.client_key, self.client_signature) | ||
| self.server_key = self.hmac(self.salted_password, b'Server Key') | ||
| self.server_signature = self.hmac(self.server_key, self.auth_message.encode('utf-8')) | ||
|
|
||
| def hmac(self, key, msg): | ||
| return hmac.new(key, msg, digestmod=self.hashfunc).digest() | ||
|
|
||
| def create_salted_password(self, salt, iterations): | ||
| self.salted_password = hashlib.pbkdf2_hmac( | ||
| self.hashname, self.password, salt, iterations | ||
| ) | ||
|
|
||
| def final_message(self): | ||
| client_final_no_proof = 'c=biws,r=' + self.nonce | ||
| return 'c=biws,r={},p={}'.format(self.nonce, base64.b64encode(self.client_proof).decode('utf-8')) | ||
|
|
||
| def process_server_final_message(self, server_final_message): | ||
| params = dict(pair.split('=', 1) for pair in server_final_message.split(',')) | ||
| if self.server_signature != base64.b64decode(params['v'].encode('utf-8')): | ||
| raise ValueError("Server sent wrong signature!") | ||
|
|
||
|
|
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters