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Bugfix for older Pythons that lack hmac.compare_digest()

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This commit is contained in:
Paul "LeoNerd" Evans 2014-09-23 19:07:16 +01:00
parent 437969eac9
commit a7d53227de
1 changed files with 11 additions and 1 deletions
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12
synapse/rest/register.py
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@ -30,6 +30,16 @@ import urllib
logger = logging.getLogger(__name__)
# We ought to be using hmac.compare_digest() but on older pythons it doesn't
# exist. It's a _really minor_ security flaw to use plain string comparison
# because the timing attack is so obscured by all the other code here it's
# unlikely to make much difference
if hasattr(hmac, "compare_digest"):
compare_digest = hmac.compare_digest
else:
compare_digest = lambda a, b: a == b
class RegisterRestServlet(RestServlet):
"""Handles registration with the home server.
@ -169,7 +179,7 @@ class RegisterRestServlet(RestServlet):
# have the buffer interface
got = str(register_json["captcha_bypass_hmac"])
if hmac.compare_digest(want, got):
if compare_digest(want, got):
session["user"] = register_json["user"]
defer.returnValue(None)
else: