如何在JWE中增加到期时间？
如何在JWE中增加到期时间？
提问于 2019-12-19 04:38:02
我试图通过以下方式向JWE添加到期时间，使用jwcrypto库生成JWE
from jwcrypto import jwe, jwk, jwt
from datetime import datetime, timedelta
import time
# create JWK from existing key
jwk_str = '{"k":"29Js2yXM6P_4v9K1mHDlYVHw8Xvm_GEhvMTvKTRLRzY","kty":"oct"}'
jwk_key = jwk.JWK.from_json(jwk_str)
# calculate expiry time
d = datetime.now() + timedelta(seconds=5)
epoch = datetime.utcfromtimestamp(0)
total_seconds = (d - epoch).total_seconds()
# Add exp to the claims
claims={"exp": total_seconds, "sub": "Some random payload"}
print(claims)
jwttoken = jwt.JWT(header={"alg": "A256KW", "enc": "A256CBC-HS512"}, claims=claims)
jwttoken.make_encrypted_token(jwk_key)
jwetokenstr = jwttoken.serialize()
print(jwetokenstr)
# wait for 10 seconds to cross the expiry time
time.sleep(10)
jwttoken = jwt.JWT()
jwttoken.deserialize(token, jwk_key) # Ideally this line should fail as expiry is reached but it doesn't
print(jwttoken.claims)我得到了有效载荷，但到期索赔没有读取，也不会在到期时失效。我做错什么了？
回答 1
Stack Overflow用户
回答已采纳
发布于 2019-12-19 06:43:59
这最终会减少到一个日期时间操作错误。
JSON令牌的exp声明应该用过期时间的秒来填充。
datetime.now()返回一个本地时间(而不是UTC时间) datetime.datetime对象。然后，上面的代码将这个本地时间datetime.datetime对象从UTC时间datetime.datetime对象的0-历元时间中减去，并计算这两者之间的总秒数，以确定终止时间。但是，因为这是将本地时间日期时间与UTC时间日期时间进行比较，因此这里的秒数实际上与时代时间相去甚远，与UTC的本地时区差是一个常数因子。
例如，如果我住在一个比UTC早5个小时的地方，我实际上将使用一个划时代时间，这比我想要的这个代码到期的真正时间差几秒。
相反，您可以简单地使用round(time.time()) + x，其中x是未来JWT应该过期的秒数。time.time()从历元返回秒(但作为浮点数，因此您需要循环)。
例如：
from jwcrypto import jwe, jwk, jwt
from datetime import datetime, timedelta
import time
jwk_str = '{"k":"29Js2yXM6P_4v9K1mHDlYVHw8Xvm_GEhvMTvKTRLRzY","kty":"oct"}'
jwk_key = jwk.JWK.from_json(jwk_str)
jwt_valid_seconds = 3
expiry_time = round(time.time()) + jwt_valid_seconds
claims={"exp": expiry_time, "sub": "Some random payload"}
jwttoken = jwt.JWT(header={"alg": "A256KW", "enc": "A256CBC-HS512"}, claims=claims)
jwttoken.make_encrypted_token(jwk_key)
jwetokenstr = jwttoken.serialize()
jwttoken2 = jwt.JWT()
jwttoken2.deserialize(jwetokenstr, jwk_key)
print('This should succeed because we are deserializing immediately before the JWT has expired:')
print(jwttoken2.claims)
# Wait for the JWT to expire, and then extra time for the leeway.
leeway = 60
time.sleep(leeway + jwt_valid_seconds + 1)
jwttoken2 = jwt.JWT()
print('\nThis should fail due to the JWT expiring:')
jwttoken2.deserialize(jwetokenstr, jwk_key)给出输出
(env) $ python jwe_expiry.py
This should succeed because we are deserializing immediately before the JWT has expired:
{"exp":1576737332,"sub":"Some random payload"}
This should fail due to the JWT expiring:
Traceback (most recent call last):
File "jwe_expiry.py", line 26, in <module>
jwttoken2.deserialize(jwetokenstr, jwk_key)
File "... python3.7/site-packages/jwcrypto/jwt.py", line 493, in deserialize
self._check_provided_claims()
File "... python3.7/site-packages/jwcrypto/jwt.py", line 370, in _check_provided_claims
self._check_default_claims(claims)
File "... python3.7/site-packages/jwcrypto/jwt.py", line 351, in _check_default_claims
self._check_exp(claims['exp'], time.time(), self._leeway)
File "... python3.7/site-packages/jwcrypto/jwt.py", line 333, in _check_exp
claim, limit, leeway))
jwcrypto.jwt.JWTExpired: Expired at 1576737332, time: 1576737392(leeway: 60)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/59403366
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