62 lines
2.2 KiB
Python
62 lines
2.2 KiB
Python
"""passbook HIBP Models"""
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from hashlib import sha1
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from django.db import models
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from django.utils.translation import gettext as _
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from requests import get
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from structlog import get_logger
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from passbook.policies.models import Policy, PolicyResult
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from passbook.policies.types import PolicyRequest
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LOGGER = get_logger()
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class HaveIBeenPwendPolicy(Policy):
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"""Check if password is on HaveIBeenPwned's list by uploading the first
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5 characters of the SHA1 Hash."""
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password_field = models.TextField(
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default="password",
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help_text=_(
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"Field key to check, field keys defined in Prompt stages are available."
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),
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)
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allowed_count = models.IntegerField(default=0)
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form = "passbook.policies.hibp.forms.HaveIBeenPwnedPolicyForm"
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def passes(self, request: PolicyRequest) -> PolicyResult:
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"""Check if password is in HIBP DB. Hashes given Password with SHA1, uses the first 5
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characters of Password in request and checks if full hash is in response. Returns 0
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if Password is not in result otherwise the count of how many times it was used."""
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if self.password_field not in request.context:
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LOGGER.warning(
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"Password field not set in Policy Request",
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field=self.password_field,
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fields=request.context.keys(),
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)
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password = request.context[self.password_field]
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pw_hash = sha1(password.encode("utf-8")).hexdigest() # nosec
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url = f"https://api.pwnedpasswords.com/range/{pw_hash[:5]}"
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result = get(url).text
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final_count = 0
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for line in result.split("\r\n"):
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full_hash, count = line.split(":")
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if pw_hash[5:] == full_hash.lower():
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final_count = int(count)
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LOGGER.debug("got hibp result", count=final_count, hash=pw_hash[:5])
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if final_count > self.allowed_count:
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message = _(
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"Password exists on %(count)d online lists." % {"count": final_count}
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)
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return PolicyResult(False, message)
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return PolicyResult(True)
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class Meta:
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verbose_name = _("Have I Been Pwned Policy")
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verbose_name_plural = _("Have I Been Pwned Policies")
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