md5 is not an approved algorithm in FIPS mode, and trying to instantiate
a hashlib.md5() will fail when the system is running in FIPS mode.
md5 is allowed when in a non-security context. There is a plan to add a
keyword parameter (usedforsecurity) to hashlib.md5() to annotate whether
or not the instance is being used in a security context.
In the case where it is not, the instantiation of md5 will be allowed.
See https://bugs.python.org/issue9216 for more details.
Some downstream python versions already support this parameter. To
support these versions, a new encapsulation of md5() has been added.
This encapsulation will pass through the usedforsecurity parameter in
the case where the parameter is supported, and strip it if it is not.
Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Thanks Carlton Gibson, Chris Jerdonek, David Smith, Keryn Knight,
Mariusz Felisiak, and Nick Pope for reviews and mentoring this
Google Summer of Code 2021 project.
The validate_key() function should be called after make_key() to ensure
that the validation is performed on the key that will actually be
stored in the cache.
Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>
- Replaced datetime.utcnow() with datetime.now().
- Replaced datetime.utcfromtimestamp() with datetime.fromtimestamp().
- Replaced datetime.utctimetuple() with datetime.timetuple().
- Replaced calendar.timegm() and datetime.utctimetuple() with datetime.timestamp().
Many of the cache operations make use of the default argument to the
.get() operation to determine whether the key was found in the cache.
The default value of the default argument is None, so this results in
these operations assuming that None is not stored in the cache when it
actually is. Adding a sentinel object solves this issue.
Unfortunately the unmaintained python-memcached library does not support
a default argument to .get(), so the previous behavior is preserved for
the deprecated MemcachedCache backend.
This removes unused (since d038c547b5)
workaround to load a cache backend with its dotted import path and
moves remaining logic to the CacheHandler.
Thanks Tim Graham for the review.
The servers property can be overridden to allow memcached backends to
alter the server configuration prior to it being passed to instantiate
the client. This allows avoidance of documentation for per-backend
differences, e.g. stripping the 'unix:' prefix for pylibmc.
DatabaseCache._cull implementation could fail if no key was found to
perform a deletion in the table. This prevented the new cache key/value
from being correctly added.
LRU culling turns every read into a kind of write to the cache: cache keys
are moved to the first position in the OrderedDict when they are retrieved.
The RWLock which permitted multiple readers while prioritizing a single
writer is obsolete since all accesses are now writes.
Ade Lee
Mariusz Felisiak
Daniyal
Andrew-Chen-Wang
Nick Pope
Sondre Lillebø Gundersen
Michael Lissner
ecogels
Nick Pope
Abhishek Ghaskata
Florian Apolloner
Guillermo Bonvehí
Dan Palmer
Jon Dufresne
daniel a rios
Daniel Fairhead
Jakub Szafrański
Tim Graham
oliver
Simon Charette
Christian Barcenas
Wang Dongxiao
Nicolas Noé
Hajime Nakagami
Grant Jenks
Дилян Палаузов
Adam Johnson