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2638 lines
107 KiB
2638 lines
107 KiB
3 years ago
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"""passlib.context - CryptContext implementation"""
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#=============================================================================
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# imports
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#=============================================================================
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from __future__ import with_statement
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# core
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import re
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import logging; log = logging.getLogger(__name__)
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import threading
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import time
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from warnings import warn
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# site
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# pkg
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from passlib import exc
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from passlib.exc import ExpectedStringError, ExpectedTypeError, PasslibConfigWarning
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from passlib.registry import get_crypt_handler, _validate_handler_name
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from passlib.utils import (handlers as uh, to_bytes,
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to_unicode, splitcomma,
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as_bool, timer, rng, getrandstr,
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)
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from passlib.utils.binary import BASE64_CHARS
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from passlib.utils.compat import (iteritems, num_types, irange,
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PY2, PY3, unicode, SafeConfigParser,
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NativeStringIO, BytesIO,
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unicode_or_bytes_types, native_string_types,
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)
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from passlib.utils.decor import deprecated_method, memoized_property
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# local
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__all__ = [
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'CryptContext',
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'LazyCryptContext',
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'CryptPolicy',
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]
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#=============================================================================
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# support
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#=============================================================================
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# private object to detect unset params
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_UNSET = object()
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def _coerce_vary_rounds(value):
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"""parse vary_rounds string to percent as [0,1) float, or integer"""
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if value.endswith("%"):
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# XXX: deprecate this in favor of raw float?
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return float(value.rstrip("%"))*.01
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try:
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return int(value)
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except ValueError:
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return float(value)
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# set of options which aren't allowed to be set via policy
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_forbidden_scheme_options = set(["salt"])
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# 'salt' - not allowed since a fixed salt would defeat the purpose.
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# dict containing funcs used to coerce strings to correct type for scheme option keys.
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# NOTE: this isn't really needed any longer, since Handler.using() handles the actual parsing.
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# keeping this around for now, though, since it makes context.to_dict() output cleaner.
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_coerce_scheme_options = dict(
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min_rounds=int,
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max_rounds=int,
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default_rounds=int,
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vary_rounds=_coerce_vary_rounds,
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salt_size=int,
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)
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def _is_handler_registered(handler):
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"""detect if handler is registered or a custom handler"""
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return get_crypt_handler(handler.name, None) is handler
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@staticmethod
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def _always_needs_update(hash, secret=None):
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"""
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dummy function patched into handler.needs_update() by _CryptConfig
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when hash alg has been deprecated for context.
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"""
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return True
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#: list of keys allowed under wildcard "all" scheme w/o a security warning.
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_global_settings = set(["truncate_error", "vary_rounds"])
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#=============================================================================
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# crypt policy
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#=============================================================================
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_preamble = ("The CryptPolicy class has been deprecated as of "
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"Passlib 1.6, and will be removed in Passlib 1.8. ")
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class CryptPolicy(object):
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"""
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.. deprecated:: 1.6
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This class has been deprecated, and will be removed in Passlib 1.8.
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All of its functionality has been rolled into :class:`CryptContext`.
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This class previously stored the configuration options for the
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CryptContext class. In the interest of interface simplification,
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all of this class' functionality has been rolled into the CryptContext
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class itself.
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The documentation for this class is now focused on documenting how to
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migrate to the new api. Additionally, where possible, the deprecation
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warnings issued by the CryptPolicy methods will list the replacement call
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that should be used.
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Constructors
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============
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CryptPolicy objects can be constructed directly using any of
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the keywords accepted by :class:`CryptContext`. Direct uses of the
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:class:`!CryptPolicy` constructor should either pass the keywords
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directly into the CryptContext constructor, or to :meth:`CryptContext.update`
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if the policy object was being used to update an existing context object.
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In addition to passing in keywords directly,
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CryptPolicy objects can be constructed by the following methods:
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.. automethod:: from_path
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.. automethod:: from_string
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.. automethod:: from_source
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.. automethod:: from_sources
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.. automethod:: replace
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Introspection
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=============
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All of the informational methods provided by this class have been deprecated
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by identical or similar methods in the :class:`CryptContext` class:
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.. automethod:: has_schemes
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.. automethod:: schemes
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.. automethod:: iter_handlers
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.. automethod:: get_handler
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.. automethod:: get_options
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.. automethod:: handler_is_deprecated
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.. automethod:: get_min_verify_time
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Exporting
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=========
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.. automethod:: iter_config
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.. automethod:: to_dict
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.. automethod:: to_file
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.. automethod:: to_string
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.. note::
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CryptPolicy are immutable.
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Use the :meth:`replace` method to mutate existing instances.
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.. deprecated:: 1.6
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"""
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#===================================================================
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# class methods
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#===================================================================
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@classmethod
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def from_path(cls, path, section="passlib", encoding="utf-8"):
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"""create a CryptPolicy instance from a local file.
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.. deprecated:: 1.6
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Creating a new CryptContext from a file, which was previously done via
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``CryptContext(policy=CryptPolicy.from_path(path))``, can now be
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done via ``CryptContext.from_path(path)``.
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See :meth:`CryptContext.from_path` for details.
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Updating an existing CryptContext from a file, which was previously done
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``context.policy = CryptPolicy.from_path(path)``, can now be
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done via ``context.load_path(path)``.
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See :meth:`CryptContext.load_path` for details.
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"""
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warn(_preamble +
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"Instead of ``CryptPolicy.from_path(path)``, "
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"use ``CryptContext.from_path(path)`` "
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" or ``context.load_path(path)`` for an existing CryptContext.",
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DeprecationWarning, stacklevel=2)
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return cls(_internal_context=CryptContext.from_path(path, section,
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encoding))
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@classmethod
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def from_string(cls, source, section="passlib", encoding="utf-8"):
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"""create a CryptPolicy instance from a string.
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.. deprecated:: 1.6
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Creating a new CryptContext from a string, which was previously done via
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``CryptContext(policy=CryptPolicy.from_string(data))``, can now be
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done via ``CryptContext.from_string(data)``.
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See :meth:`CryptContext.from_string` for details.
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Updating an existing CryptContext from a string, which was previously done
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``context.policy = CryptPolicy.from_string(data)``, can now be
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done via ``context.load(data)``.
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See :meth:`CryptContext.load` for details.
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"""
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warn(_preamble +
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"Instead of ``CryptPolicy.from_string(source)``, "
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"use ``CryptContext.from_string(source)`` or "
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"``context.load(source)`` for an existing CryptContext.",
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DeprecationWarning, stacklevel=2)
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return cls(_internal_context=CryptContext.from_string(source, section,
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encoding))
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@classmethod
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def from_source(cls, source, _warn=True):
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"""create a CryptPolicy instance from some source.
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this method autodetects the source type, and invokes
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the appropriate constructor automatically. it attempts
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to detect whether the source is a configuration string, a filepath,
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a dictionary, or an existing CryptPolicy instance.
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.. deprecated:: 1.6
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Create a new CryptContext, which could previously be done via
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``CryptContext(policy=CryptPolicy.from_source(source))``, should
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now be done using an explicit method: the :class:`CryptContext`
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constructor itself, :meth:`CryptContext.from_path`,
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or :meth:`CryptContext.from_string`.
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Updating an existing CryptContext, which could previously be done via
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``context.policy = CryptPolicy.from_source(source)``, should
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now be done using an explicit method: :meth:`CryptContext.update`,
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or :meth:`CryptContext.load`.
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"""
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if _warn:
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warn(_preamble +
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"Instead of ``CryptPolicy.from_source()``, "
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"use ``CryptContext.from_string(path)`` "
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" or ``CryptContext.from_path(source)``, as appropriate.",
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DeprecationWarning, stacklevel=2)
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if isinstance(source, CryptPolicy):
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return source
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elif isinstance(source, dict):
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return cls(_internal_context=CryptContext(**source))
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elif not isinstance(source, (bytes,unicode)):
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raise TypeError("source must be CryptPolicy, dict, config string, "
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"or file path: %r" % (type(source),))
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elif any(c in source for c in "\n\r\t") or not source.strip(" \t./;:"):
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return cls(_internal_context=CryptContext.from_string(source))
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else:
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return cls(_internal_context=CryptContext.from_path(source))
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@classmethod
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def from_sources(cls, sources, _warn=True):
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"""create a CryptPolicy instance by merging multiple sources.
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each source is interpreted as by :meth:`from_source`,
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and the results are merged together.
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.. deprecated:: 1.6
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Instead of using this method to merge multiple policies together,
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a :class:`CryptContext` instance should be created, and then
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the multiple sources merged together via :meth:`CryptContext.load`.
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"""
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if _warn:
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warn(_preamble +
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"Instead of ``CryptPolicy.from_sources()``, "
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"use the various CryptContext constructors "
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" followed by ``context.update()``.",
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DeprecationWarning, stacklevel=2)
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if len(sources) == 0:
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raise ValueError("no sources specified")
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if len(sources) == 1:
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return cls.from_source(sources[0], _warn=False)
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kwds = {}
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for source in sources:
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kwds.update(cls.from_source(source, _warn=False)._context.to_dict(resolve=True))
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return cls(_internal_context=CryptContext(**kwds))
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def replace(self, *args, **kwds):
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"""create a new CryptPolicy, optionally updating parts of the
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existing configuration.
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.. deprecated:: 1.6
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Callers of this method should :meth:`CryptContext.update` or
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:meth:`CryptContext.copy` instead.
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"""
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if self._stub_policy:
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warn(_preamble + # pragma: no cover -- deprecated & unused
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"Instead of ``context.policy.replace()``, "
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"use ``context.update()`` or ``context.copy()``.",
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DeprecationWarning, stacklevel=2)
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else:
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warn(_preamble +
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"Instead of ``CryptPolicy().replace()``, "
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"create a CryptContext instance and "
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"use ``context.update()`` or ``context.copy()``.",
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DeprecationWarning, stacklevel=2)
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sources = [ self ]
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if args:
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sources.extend(args)
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if kwds:
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sources.append(kwds)
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return CryptPolicy.from_sources(sources, _warn=False)
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#===================================================================
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# instance attrs
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||
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#===================================================================
|
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# internal CryptContext we're wrapping to handle everything
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# until this class is removed.
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_context = None
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# flag indicating this is wrapper generated by the CryptContext.policy
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# attribute, rather than one created independantly by the application.
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_stub_policy = False
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#===================================================================
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# init
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||
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#===================================================================
|
||
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def __init__(self, *args, **kwds):
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context = kwds.pop("_internal_context", None)
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||
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if context:
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assert isinstance(context, CryptContext)
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self._context = context
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self._stub_policy = kwds.pop("_stub_policy", False)
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assert not (args or kwds), "unexpected args: %r %r" % (args,kwds)
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else:
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if args:
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if len(args) != 1:
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||
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raise TypeError("only one positional argument accepted")
|
||
|
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if kwds:
|
||
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raise TypeError("cannot specify positional arg and kwds")
|
||
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kwds = args[0]
|
||
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warn(_preamble +
|
||
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"Instead of constructing a CryptPolicy instance, "
|
||
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"create a CryptContext directly, or use ``context.update()`` "
|
||
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"and ``context.load()`` to reconfigure existing CryptContext "
|
||
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"instances.",
|
||
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DeprecationWarning, stacklevel=2)
|
||
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self._context = CryptContext(**kwds)
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# public interface for examining options
|
||
|
|
#===================================================================
|
||
|
|
def has_schemes(self):
|
||
|
|
"""return True if policy defines *any* schemes for use.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use ``bool(context.schemes())`` instead.
|
||
|
|
see :meth:`CryptContext.schemes`.
|
||
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|
"""
|
||
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|
if self._stub_policy:
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||
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warn(_preamble + # pragma: no cover -- deprecated & unused
|
||
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"Instead of ``context.policy.has_schemes()``, "
|
||
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"use ``bool(context.schemes())``.",
|
||
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DeprecationWarning, stacklevel=2)
|
||
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else:
|
||
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warn(_preamble +
|
||
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|
"Instead of ``CryptPolicy().has_schemes()``, "
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||
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"create a CryptContext instance and "
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||
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"use ``bool(context.schemes())``.",
|
||
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DeprecationWarning, stacklevel=2)
|
||
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return bool(self._context.schemes())
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||
|
|
|
||
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def iter_handlers(self):
|
||
|
|
"""return iterator over handlers defined in policy.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use ``context.schemes(resolve=True))`` instead.
|
||
|
|
see :meth:`CryptContext.schemes`.
|
||
|
|
"""
|
||
|
|
if self._stub_policy:
|
||
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warn(_preamble +
|
||
|
|
"Instead of ``context.policy.iter_handlers()``, "
|
||
|
|
"use ``context.schemes(resolve=True)``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``CryptPolicy().iter_handlers()``, "
|
||
|
|
"create a CryptContext instance and "
|
||
|
|
"use ``context.schemes(resolve=True)``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
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return self._context.schemes(resolve=True, unconfigured=True)
|
||
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|
|
||
|
|
def schemes(self, resolve=False):
|
||
|
|
"""return list of schemes defined in policy.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use :meth:`CryptContext.schemes` instead.
|
||
|
|
"""
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble + # pragma: no cover -- deprecated & unused
|
||
|
|
"Instead of ``context.policy.schemes()``, "
|
||
|
|
"use ``context.schemes()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``CryptPolicy().schemes()``, "
|
||
|
|
"create a CryptContext instance and "
|
||
|
|
"use ``context.schemes()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
return list(self._context.schemes(resolve=resolve, unconfigured=True))
|
||
|
|
|
||
|
|
def get_handler(self, name=None, category=None, required=False):
|
||
|
|
"""return handler as specified by name, or default handler.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use :meth:`CryptContext.handler` instead,
|
||
|
|
though note that the ``required`` keyword has been removed,
|
||
|
|
and the new method will always act as if ``required=True``.
|
||
|
|
"""
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``context.policy.get_handler()``, "
|
||
|
|
"use ``context.handler()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``CryptPolicy().get_handler()``, "
|
||
|
|
"create a CryptContext instance and "
|
||
|
|
"use ``context.handler()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
# CryptContext.handler() doesn't support required=False,
|
||
|
|
# so wrapping it in try/except
|
||
|
|
try:
|
||
|
|
return self._context.handler(name, category, unconfigured=True)
|
||
|
|
except KeyError:
|
||
|
|
if required:
|
||
|
|
raise
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def get_min_verify_time(self, category=None):
|
||
|
|
"""get min_verify_time setting for policy.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
min_verify_time option will be removed entirely in passlib 1.8
|
||
|
|
|
||
|
|
.. versionchanged:: 1.7
|
||
|
|
this method now always returns the value automatically
|
||
|
|
calculated by :meth:`CryptContext.min_verify_time`,
|
||
|
|
any value specified by policy is ignored.
|
||
|
|
"""
|
||
|
|
warn("get_min_verify_time() and min_verify_time option is deprecated and ignored, "
|
||
|
|
"and will be removed in Passlib 1.8", DeprecationWarning,
|
||
|
|
stacklevel=2)
|
||
|
|
return 0
|
||
|
|
|
||
|
|
def get_options(self, name, category=None):
|
||
|
|
"""return dictionary of options specific to a given handler.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
this method has no direct replacement in the 1.6 api, as there
|
||
|
|
is not a clearly defined use-case. however, examining the output of
|
||
|
|
:meth:`CryptContext.to_dict` should serve as the closest alternative.
|
||
|
|
"""
|
||
|
|
# XXX: might make a public replacement, but need more study of the use cases.
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble + # pragma: no cover -- deprecated & unused
|
||
|
|
"``context.policy.get_options()`` will no longer be available.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"``CryptPolicy().get_options()`` will no longer be available.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
if hasattr(name, "name"):
|
||
|
|
name = name.name
|
||
|
|
return self._context._config._get_record_options_with_flag(name, category)[0]
|
||
|
|
|
||
|
|
def handler_is_deprecated(self, name, category=None):
|
||
|
|
"""check if handler has been deprecated by policy.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
this method has no direct replacement in the 1.6 api, as there
|
||
|
|
is not a clearly defined use-case. however, examining the output of
|
||
|
|
:meth:`CryptContext.to_dict` should serve as the closest alternative.
|
||
|
|
"""
|
||
|
|
# XXX: might make a public replacement, but need more study of the use cases.
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble +
|
||
|
|
"``context.policy.handler_is_deprecated()`` will no longer be available.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"``CryptPolicy().handler_is_deprecated()`` will no longer be available.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
if hasattr(name, "name"):
|
||
|
|
name = name.name
|
||
|
|
return self._context.handler(name, category).deprecated
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# serialization
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
def iter_config(self, ini=False, resolve=False):
|
||
|
|
"""iterate over key/value pairs representing the policy object.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use :meth:`CryptContext.to_dict` instead.
|
||
|
|
"""
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble + # pragma: no cover -- deprecated & unused
|
||
|
|
"Instead of ``context.policy.iter_config()``, "
|
||
|
|
"use ``context.to_dict().items()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``CryptPolicy().iter_config()``, "
|
||
|
|
"create a CryptContext instance and "
|
||
|
|
"use ``context.to_dict().items()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
# hacked code that renders keys & values in manner that approximates
|
||
|
|
# old behavior. context.to_dict() is much cleaner.
|
||
|
|
context = self._context
|
||
|
|
if ini:
|
||
|
|
def render_key(key):
|
||
|
|
return context._render_config_key(key).replace("__", ".")
|
||
|
|
def render_value(value):
|
||
|
|
if isinstance(value, (list,tuple)):
|
||
|
|
value = ", ".join(value)
|
||
|
|
return value
|
||
|
|
resolve = False
|
||
|
|
else:
|
||
|
|
render_key = context._render_config_key
|
||
|
|
render_value = lambda value: value
|
||
|
|
return (
|
||
|
|
(render_key(key), render_value(value))
|
||
|
|
for key, value in context._config.iter_config(resolve)
|
||
|
|
)
|
||
|
|
|
||
|
|
def to_dict(self, resolve=False):
|
||
|
|
"""export policy object as dictionary of options.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use :meth:`CryptContext.to_dict` instead.
|
||
|
|
"""
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``context.policy.to_dict()``, "
|
||
|
|
"use ``context.to_dict()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``CryptPolicy().to_dict()``, "
|
||
|
|
"create a CryptContext instance and "
|
||
|
|
"use ``context.to_dict()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
return self._context.to_dict(resolve)
|
||
|
|
|
||
|
|
def to_file(self, stream, section="passlib"): # pragma: no cover -- deprecated & unused
|
||
|
|
"""export policy to file.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use :meth:`CryptContext.to_string` instead,
|
||
|
|
and then write the output to a file as desired.
|
||
|
|
"""
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``context.policy.to_file(stream)``, "
|
||
|
|
"use ``stream.write(context.to_string())``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``CryptPolicy().to_file(stream)``, "
|
||
|
|
"create a CryptContext instance and "
|
||
|
|
"use ``stream.write(context.to_string())``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
out = self._context.to_string(section=section)
|
||
|
|
if PY2:
|
||
|
|
out = out.encode("utf-8")
|
||
|
|
stream.write(out)
|
||
|
|
|
||
|
|
def to_string(self, section="passlib", encoding=None):
|
||
|
|
"""export policy to file.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
applications should use :meth:`CryptContext.to_string` instead.
|
||
|
|
"""
|
||
|
|
if self._stub_policy:
|
||
|
|
warn(_preamble + # pragma: no cover -- deprecated & unused
|
||
|
|
"Instead of ``context.policy.to_string()``, "
|
||
|
|
"use ``context.to_string()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
else:
|
||
|
|
warn(_preamble +
|
||
|
|
"Instead of ``CryptPolicy().to_string()``, "
|
||
|
|
"create a CryptContext instance and "
|
||
|
|
"use ``context.to_string()``.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
out = self._context.to_string(section=section)
|
||
|
|
if encoding:
|
||
|
|
out = out.encode(encoding)
|
||
|
|
return out
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# eoc
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
#=============================================================================
|
||
|
|
# _CryptConfig helper class
|
||
|
|
#=============================================================================
|
||
|
|
class _CryptConfig(object):
|
||
|
|
"""parses, validates, and stores CryptContext config
|
||
|
|
|
||
|
|
this is a helper used internally by CryptContext to handle
|
||
|
|
parsing, validation, and serialization of its config options.
|
||
|
|
split out from the main class, but not made public since
|
||
|
|
that just complicates interface too much (c.f. CryptPolicy)
|
||
|
|
|
||
|
|
:arg source: config as dict mapping ``(cat,scheme,option) -> value``
|
||
|
|
"""
|
||
|
|
#===================================================================
|
||
|
|
# instance attrs
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
# triple-nested dict which maps scheme -> category -> key -> value,
|
||
|
|
# storing all hash-specific options
|
||
|
|
_scheme_options = None
|
||
|
|
|
||
|
|
# double-nested dict which maps key -> category -> value
|
||
|
|
# storing all CryptContext options
|
||
|
|
_context_options = None
|
||
|
|
|
||
|
|
# tuple of handler objects
|
||
|
|
handlers = None
|
||
|
|
|
||
|
|
# tuple of scheme objects in same order as handlers
|
||
|
|
schemes = None
|
||
|
|
|
||
|
|
# tuple of categories in alphabetical order (not including None)
|
||
|
|
categories = None
|
||
|
|
|
||
|
|
# set of all context keywords used by active schemes
|
||
|
|
context_kwds = None
|
||
|
|
|
||
|
|
# dict mapping category -> default scheme
|
||
|
|
_default_schemes = None
|
||
|
|
|
||
|
|
# dict mapping (scheme, category) -> custom handler
|
||
|
|
_records = None
|
||
|
|
|
||
|
|
# dict mapping category -> list of custom handler instances for that category,
|
||
|
|
# in order of schemes(). populated on demand by _get_record_list()
|
||
|
|
_record_lists = None
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# constructor
|
||
|
|
#===================================================================
|
||
|
|
def __init__(self, source):
|
||
|
|
self._init_scheme_list(source.get((None,None,"schemes")))
|
||
|
|
self._init_options(source)
|
||
|
|
self._init_default_schemes()
|
||
|
|
self._init_records()
|
||
|
|
|
||
|
|
def _init_scheme_list(self, data):
|
||
|
|
"""initialize .handlers and .schemes attributes"""
|
||
|
|
handlers = []
|
||
|
|
schemes = []
|
||
|
|
if isinstance(data, native_string_types):
|
||
|
|
data = splitcomma(data)
|
||
|
|
for elem in data or ():
|
||
|
|
# resolve elem -> handler & scheme
|
||
|
|
if hasattr(elem, "name"):
|
||
|
|
handler = elem
|
||
|
|
scheme = handler.name
|
||
|
|
_validate_handler_name(scheme)
|
||
|
|
elif isinstance(elem, native_string_types):
|
||
|
|
handler = get_crypt_handler(elem)
|
||
|
|
scheme = handler.name
|
||
|
|
else:
|
||
|
|
raise TypeError("scheme must be name or CryptHandler, "
|
||
|
|
"not %r" % type(elem))
|
||
|
|
|
||
|
|
# check scheme name isn't already in use
|
||
|
|
if scheme in schemes:
|
||
|
|
raise KeyError("multiple handlers with same name: %r" %
|
||
|
|
(scheme,))
|
||
|
|
|
||
|
|
# add to handler list
|
||
|
|
handlers.append(handler)
|
||
|
|
schemes.append(scheme)
|
||
|
|
|
||
|
|
self.handlers = tuple(handlers)
|
||
|
|
self.schemes = tuple(schemes)
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# lowlevel options
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
#---------------------------------------------------------------
|
||
|
|
# init lowlevel option storage
|
||
|
|
#---------------------------------------------------------------
|
||
|
|
def _init_options(self, source):
|
||
|
|
"""load config dict into internal representation,
|
||
|
|
and init .categories attr
|
||
|
|
"""
|
||
|
|
# prepare dicts & locals
|
||
|
|
norm_scheme_option = self._norm_scheme_option
|
||
|
|
norm_context_option = self._norm_context_option
|
||
|
|
self._scheme_options = scheme_options = {}
|
||
|
|
self._context_options = context_options = {}
|
||
|
|
categories = set()
|
||
|
|
|
||
|
|
# load source config into internal storage
|
||
|
|
for (cat, scheme, key), value in iteritems(source):
|
||
|
|
categories.add(cat)
|
||
|
|
explicit_scheme = scheme
|
||
|
|
if not cat and not scheme and key in _global_settings:
|
||
|
|
# going forward, not using "<cat>__all__<key>" format. instead...
|
||
|
|
# whitelisting set of keys which should be passed to (all) schemes,
|
||
|
|
# rather than passed to the CryptContext itself
|
||
|
|
scheme = "all"
|
||
|
|
if scheme:
|
||
|
|
# normalize scheme option
|
||
|
|
key, value = norm_scheme_option(key, value)
|
||
|
|
|
||
|
|
# e.g. things like "min_rounds" should never be set cross-scheme
|
||
|
|
# this will be fatal under 2.0.
|
||
|
|
if scheme == "all" and key not in _global_settings:
|
||
|
|
warn("The '%s' option should be configured per-algorithm, and not set "
|
||
|
|
"globally in the context; This will be an error in Passlib 2.0" %
|
||
|
|
(key,), PasslibConfigWarning)
|
||
|
|
|
||
|
|
# this scheme is going away in 2.0;
|
||
|
|
# but most keys deserve an extra warning since it impacts security.
|
||
|
|
if explicit_scheme == "all":
|
||
|
|
warn("The 'all' scheme is deprecated as of Passlib 1.7, "
|
||
|
|
"and will be removed in Passlib 2.0; Please configure "
|
||
|
|
"options on a per-algorithm basis.", DeprecationWarning)
|
||
|
|
|
||
|
|
# store in scheme_options
|
||
|
|
# map structure: scheme_options[scheme][category][key] = value
|
||
|
|
try:
|
||
|
|
category_map = scheme_options[scheme]
|
||
|
|
except KeyError:
|
||
|
|
scheme_options[scheme] = {cat: {key: value}}
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
option_map = category_map[cat]
|
||
|
|
except KeyError:
|
||
|
|
category_map[cat] = {key: value}
|
||
|
|
else:
|
||
|
|
option_map[key] = value
|
||
|
|
else:
|
||
|
|
# normalize context option
|
||
|
|
if cat and key == "schemes":
|
||
|
|
raise KeyError("'schemes' context option is not allowed "
|
||
|
|
"per category")
|
||
|
|
key, value = norm_context_option(cat, key, value)
|
||
|
|
if key == "min_verify_time": # ignored in 1.7, to be removed in 1.8
|
||
|
|
continue
|
||
|
|
|
||
|
|
# store in context_options
|
||
|
|
# map structure: context_options[key][category] = value
|
||
|
|
try:
|
||
|
|
category_map = context_options[key]
|
||
|
|
except KeyError:
|
||
|
|
context_options[key] = {cat: value}
|
||
|
|
else:
|
||
|
|
category_map[cat] = value
|
||
|
|
|
||
|
|
# store list of configured categories
|
||
|
|
categories.discard(None)
|
||
|
|
self.categories = tuple(sorted(categories))
|
||
|
|
|
||
|
|
def _norm_scheme_option(self, key, value):
|
||
|
|
# check for invalid options
|
||
|
|
if key in _forbidden_scheme_options:
|
||
|
|
raise KeyError("%r option not allowed in CryptContext "
|
||
|
|
"configuration" % (key,))
|
||
|
|
# coerce strings for certain fields (e.g. min_rounds uses ints)
|
||
|
|
if isinstance(value, native_string_types):
|
||
|
|
func = _coerce_scheme_options.get(key)
|
||
|
|
if func:
|
||
|
|
value = func(value)
|
||
|
|
return key, value
|
||
|
|
|
||
|
|
def _norm_context_option(self, cat, key, value):
|
||
|
|
schemes = self.schemes
|
||
|
|
if key == "default":
|
||
|
|
if hasattr(value, "name"):
|
||
|
|
value = value.name
|
||
|
|
elif not isinstance(value, native_string_types):
|
||
|
|
raise ExpectedTypeError(value, "str", "default")
|
||
|
|
if schemes and value not in schemes:
|
||
|
|
raise KeyError("default scheme not found in policy")
|
||
|
|
elif key == "deprecated":
|
||
|
|
if isinstance(value, native_string_types):
|
||
|
|
value = splitcomma(value)
|
||
|
|
elif not isinstance(value, (list,tuple)):
|
||
|
|
raise ExpectedTypeError(value, "str or seq", "deprecated")
|
||
|
|
if 'auto' in value:
|
||
|
|
# XXX: have any statements been made about when this is default?
|
||
|
|
# should do it in 1.8 at latest.
|
||
|
|
if len(value) > 1:
|
||
|
|
raise ValueError("cannot list other schemes if "
|
||
|
|
"``deprecated=['auto']`` is used")
|
||
|
|
elif schemes:
|
||
|
|
# make sure list of deprecated schemes is subset of configured schemes
|
||
|
|
for scheme in value:
|
||
|
|
if not isinstance(scheme, native_string_types):
|
||
|
|
raise ExpectedTypeError(value, "str", "deprecated element")
|
||
|
|
if scheme not in schemes:
|
||
|
|
raise KeyError("deprecated scheme not found "
|
||
|
|
"in policy: %r" % (scheme,))
|
||
|
|
elif key == "min_verify_time":
|
||
|
|
warn("'min_verify_time' was deprecated in Passlib 1.6, is "
|
||
|
|
"ignored in 1.7, and will be removed in 1.8",
|
||
|
|
DeprecationWarning)
|
||
|
|
elif key == "harden_verify":
|
||
|
|
warn("'harden_verify' is deprecated & ignored as of Passlib 1.7.1, "
|
||
|
|
" and will be removed in 1.8",
|
||
|
|
DeprecationWarning)
|
||
|
|
elif key != "schemes":
|
||
|
|
raise KeyError("unknown CryptContext keyword: %r" % (key,))
|
||
|
|
return key, value
|
||
|
|
|
||
|
|
#---------------------------------------------------------------
|
||
|
|
# reading context options
|
||
|
|
#---------------------------------------------------------------
|
||
|
|
def get_context_optionmap(self, key, _default={}):
|
||
|
|
"""return dict mapping category->value for specific context option.
|
||
|
|
|
||
|
|
.. warning:: treat return value as readonly!
|
||
|
|
"""
|
||
|
|
return self._context_options.get(key, _default)
|
||
|
|
|
||
|
|
def get_context_option_with_flag(self, category, key):
|
||
|
|
"""return value of specific option, handling category inheritance.
|
||
|
|
also returns flag indicating whether value is category-specific.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
category_map = self._context_options[key]
|
||
|
|
except KeyError:
|
||
|
|
return None, False
|
||
|
|
value = category_map.get(None)
|
||
|
|
if category:
|
||
|
|
try:
|
||
|
|
alt = category_map[category]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
if value is None or alt != value:
|
||
|
|
return alt, True
|
||
|
|
return value, False
|
||
|
|
|
||
|
|
#---------------------------------------------------------------
|
||
|
|
# reading scheme options
|
||
|
|
#---------------------------------------------------------------
|
||
|
|
def _get_scheme_optionmap(self, scheme, category, default={}):
|
||
|
|
"""return all options for (scheme,category) combination
|
||
|
|
|
||
|
|
.. warning:: treat return value as readonly!
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
return self._scheme_options[scheme][category]
|
||
|
|
except KeyError:
|
||
|
|
return default
|
||
|
|
|
||
|
|
def get_base_handler(self, scheme):
|
||
|
|
return self.handlers[self.schemes.index(scheme)]
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def expand_settings(handler):
|
||
|
|
setting_kwds = handler.setting_kwds
|
||
|
|
if 'rounds' in handler.setting_kwds:
|
||
|
|
# XXX: historically this extras won't be listed in setting_kwds
|
||
|
|
setting_kwds += uh.HasRounds.using_rounds_kwds
|
||
|
|
return setting_kwds
|
||
|
|
|
||
|
|
# NOTE: this is only used by _get_record_options_with_flag()...
|
||
|
|
def get_scheme_options_with_flag(self, scheme, category):
|
||
|
|
"""return composite dict of all options set for scheme.
|
||
|
|
includes options inherited from 'all' and from default category.
|
||
|
|
result can be modified.
|
||
|
|
returns (kwds, has_cat_specific_options)
|
||
|
|
"""
|
||
|
|
# start out with copy of global options
|
||
|
|
get_optionmap = self._get_scheme_optionmap
|
||
|
|
kwds = get_optionmap("all", None).copy()
|
||
|
|
has_cat_options = False
|
||
|
|
|
||
|
|
# add in category-specific global options
|
||
|
|
if category:
|
||
|
|
defkwds = kwds.copy() # <-- used to detect category-specific options
|
||
|
|
kwds.update(get_optionmap("all", category))
|
||
|
|
|
||
|
|
# filter out global settings not supported by handler
|
||
|
|
allowed_settings = self.expand_settings(self.get_base_handler(scheme))
|
||
|
|
for key in set(kwds).difference(allowed_settings):
|
||
|
|
kwds.pop(key)
|
||
|
|
if category:
|
||
|
|
for key in set(defkwds).difference(allowed_settings):
|
||
|
|
defkwds.pop(key)
|
||
|
|
|
||
|
|
# add in default options for scheme
|
||
|
|
other = get_optionmap(scheme, None)
|
||
|
|
kwds.update(other)
|
||
|
|
|
||
|
|
# load category-specific options for scheme
|
||
|
|
if category:
|
||
|
|
defkwds.update(other)
|
||
|
|
kwds.update(get_optionmap(scheme, category))
|
||
|
|
|
||
|
|
# compare default category options to see if there's anything
|
||
|
|
# category-specific
|
||
|
|
if kwds != defkwds:
|
||
|
|
has_cat_options = True
|
||
|
|
|
||
|
|
return kwds, has_cat_options
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# deprecated & default schemes
|
||
|
|
#===================================================================
|
||
|
|
def _init_default_schemes(self):
|
||
|
|
"""initialize maps containing default scheme for each category.
|
||
|
|
|
||
|
|
have to do this after _init_options(), since the default scheme
|
||
|
|
is affected by the list of deprecated schemes.
|
||
|
|
"""
|
||
|
|
# init maps & locals
|
||
|
|
get_optionmap = self.get_context_optionmap
|
||
|
|
default_map = self._default_schemes = get_optionmap("default").copy()
|
||
|
|
dep_map = get_optionmap("deprecated")
|
||
|
|
schemes = self.schemes
|
||
|
|
if not schemes:
|
||
|
|
return
|
||
|
|
|
||
|
|
# figure out default scheme
|
||
|
|
deps = dep_map.get(None) or ()
|
||
|
|
default = default_map.get(None)
|
||
|
|
if not default:
|
||
|
|
for scheme in schemes:
|
||
|
|
if scheme not in deps:
|
||
|
|
default_map[None] = scheme
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
raise ValueError("must have at least one non-deprecated scheme")
|
||
|
|
elif default in deps:
|
||
|
|
raise ValueError("default scheme cannot be deprecated")
|
||
|
|
|
||
|
|
# figure out per-category default schemes,
|
||
|
|
for cat in self.categories:
|
||
|
|
cdeps = dep_map.get(cat, deps)
|
||
|
|
cdefault = default_map.get(cat, default)
|
||
|
|
if not cdefault:
|
||
|
|
for scheme in schemes:
|
||
|
|
if scheme not in cdeps:
|
||
|
|
default_map[cat] = scheme
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
raise ValueError("must have at least one non-deprecated "
|
||
|
|
"scheme for %r category" % cat)
|
||
|
|
elif cdefault in cdeps:
|
||
|
|
raise ValueError("default scheme for %r category "
|
||
|
|
"cannot be deprecated" % cat)
|
||
|
|
|
||
|
|
def default_scheme(self, category):
|
||
|
|
"""return default scheme for specific category"""
|
||
|
|
defaults = self._default_schemes
|
||
|
|
try:
|
||
|
|
return defaults[category]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
if not self.schemes:
|
||
|
|
raise KeyError("no hash schemes configured for this "
|
||
|
|
"CryptContext instance")
|
||
|
|
return defaults[None]
|
||
|
|
|
||
|
|
def is_deprecated_with_flag(self, scheme, category):
|
||
|
|
"""is scheme deprecated under particular category?"""
|
||
|
|
depmap = self.get_context_optionmap("deprecated")
|
||
|
|
def test(cat):
|
||
|
|
source = depmap.get(cat, depmap.get(None))
|
||
|
|
if source is None:
|
||
|
|
return None
|
||
|
|
elif 'auto' in source:
|
||
|
|
return scheme != self.default_scheme(cat)
|
||
|
|
else:
|
||
|
|
return scheme in source
|
||
|
|
value = test(None) or False
|
||
|
|
if category:
|
||
|
|
alt = test(category)
|
||
|
|
if alt is not None and value != alt:
|
||
|
|
return alt, True
|
||
|
|
return value, False
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# CryptRecord objects
|
||
|
|
#===================================================================
|
||
|
|
def _init_records(self):
|
||
|
|
# NOTE: this step handles final validation of settings,
|
||
|
|
# checking for violations against handler's internal invariants.
|
||
|
|
# this is why we create all the records now,
|
||
|
|
# so CryptContext throws error immediately rather than later.
|
||
|
|
self._record_lists = {}
|
||
|
|
records = self._records = {}
|
||
|
|
all_context_kwds = self.context_kwds = set()
|
||
|
|
get_options = self._get_record_options_with_flag
|
||
|
|
categories = (None,) + self.categories
|
||
|
|
for handler in self.handlers:
|
||
|
|
scheme = handler.name
|
||
|
|
all_context_kwds.update(handler.context_kwds)
|
||
|
|
for cat in categories:
|
||
|
|
kwds, has_cat_options = get_options(scheme, cat)
|
||
|
|
if cat is None or has_cat_options:
|
||
|
|
records[scheme, cat] = self._create_record(handler, cat, **kwds)
|
||
|
|
# NOTE: if handler has no category-specific opts, get_record()
|
||
|
|
# will automatically use the default category's record.
|
||
|
|
# NOTE: default records for specific category stored under the
|
||
|
|
# key (None,category); these are populated on-demand by get_record().
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _create_record(handler, category=None, deprecated=False, **settings):
|
||
|
|
# create custom handler if needed.
|
||
|
|
try:
|
||
|
|
# XXX: relaxed=True is mostly here to retain backwards-compat behavior.
|
||
|
|
# could make this optional flag in future.
|
||
|
|
subcls = handler.using(relaxed=True, **settings)
|
||
|
|
except TypeError as err:
|
||
|
|
m = re.match(r".* unexpected keyword argument '(.*)'$", str(err))
|
||
|
|
if m and m.group(1) in settings:
|
||
|
|
# translate into KeyError, for backwards compat.
|
||
|
|
# XXX: push this down to GenericHandler.using() implementation?
|
||
|
|
key = m.group(1)
|
||
|
|
raise KeyError("keyword not supported by %s handler: %r" %
|
||
|
|
(handler.name, key))
|
||
|
|
raise
|
||
|
|
|
||
|
|
# using private attrs to store some extra metadata in custom handler
|
||
|
|
assert subcls is not handler, "expected unique variant of handler"
|
||
|
|
##subcls._Context__category = category
|
||
|
|
subcls._Context__orig_handler = handler
|
||
|
|
subcls.deprecated = deprecated # attr reserved for this purpose
|
||
|
|
return subcls
|
||
|
|
|
||
|
|
def _get_record_options_with_flag(self, scheme, category):
|
||
|
|
"""return composite dict of options for given scheme + category.
|
||
|
|
|
||
|
|
this is currently a private method, though some variant
|
||
|
|
of its output may eventually be made public.
|
||
|
|
|
||
|
|
given a scheme & category, it returns two things:
|
||
|
|
a set of all the keyword options to pass to :meth:`_create_record`,
|
||
|
|
and a bool flag indicating whether any of these options
|
||
|
|
were specific to the named category. if this flag is false,
|
||
|
|
the options are identical to the options for the default category.
|
||
|
|
|
||
|
|
the options dict includes all the scheme-specific settings,
|
||
|
|
as well as optional *deprecated* keyword.
|
||
|
|
"""
|
||
|
|
# get scheme options
|
||
|
|
kwds, has_cat_options = self.get_scheme_options_with_flag(scheme, category)
|
||
|
|
|
||
|
|
# throw in deprecated flag
|
||
|
|
value, not_inherited = self.is_deprecated_with_flag(scheme, category)
|
||
|
|
if value:
|
||
|
|
kwds['deprecated'] = True
|
||
|
|
if not_inherited:
|
||
|
|
has_cat_options = True
|
||
|
|
|
||
|
|
return kwds, has_cat_options
|
||
|
|
|
||
|
|
def get_record(self, scheme, category):
|
||
|
|
"""return record for specific scheme & category (cached)"""
|
||
|
|
# NOTE: this is part of the critical path shared by
|
||
|
|
# all of CryptContext's PasswordHash methods,
|
||
|
|
# hence all the caching and error checking.
|
||
|
|
|
||
|
|
# quick lookup in cache
|
||
|
|
try:
|
||
|
|
return self._records[scheme, category]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
# type check
|
||
|
|
if category is not None and not isinstance(category, native_string_types):
|
||
|
|
if PY2 and isinstance(category, unicode):
|
||
|
|
# for compatibility with unicode-centric py2 apps
|
||
|
|
return self.get_record(scheme, category.encode("utf-8"))
|
||
|
|
raise ExpectedTypeError(category, "str or None", "category")
|
||
|
|
if scheme is not None and not isinstance(scheme, native_string_types):
|
||
|
|
raise ExpectedTypeError(scheme, "str or None", "scheme")
|
||
|
|
|
||
|
|
# if scheme=None,
|
||
|
|
# use record for category's default scheme, and cache result.
|
||
|
|
if not scheme:
|
||
|
|
default = self.default_scheme(category)
|
||
|
|
assert default
|
||
|
|
record = self._records[None, category] = self.get_record(default,
|
||
|
|
category)
|
||
|
|
return record
|
||
|
|
|
||
|
|
# if no record for (scheme, category),
|
||
|
|
# use record for (scheme, None), and cache result.
|
||
|
|
if category:
|
||
|
|
try:
|
||
|
|
cache = self._records
|
||
|
|
record = cache[scheme, category] = cache[scheme, None]
|
||
|
|
return record
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
# scheme not found in configuration for default category
|
||
|
|
raise KeyError("crypt algorithm not found in policy: %r" % (scheme,))
|
||
|
|
|
||
|
|
def _get_record_list(self, category=None):
|
||
|
|
"""return list of records for category (cached)
|
||
|
|
|
||
|
|
this is an internal helper used only by identify_record()
|
||
|
|
"""
|
||
|
|
# type check of category - handled by _get_record()
|
||
|
|
# quick lookup in cache
|
||
|
|
try:
|
||
|
|
return self._record_lists[category]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
# cache miss - build list from scratch
|
||
|
|
value = self._record_lists[category] = [
|
||
|
|
self.get_record(scheme, category)
|
||
|
|
for scheme in self.schemes
|
||
|
|
]
|
||
|
|
return value
|
||
|
|
|
||
|
|
def identify_record(self, hash, category, required=True):
|
||
|
|
"""internal helper to identify appropriate custom handler for hash"""
|
||
|
|
# NOTE: this is part of the critical path shared by
|
||
|
|
# all of CryptContext's PasswordHash methods,
|
||
|
|
# hence all the caching and error checking.
|
||
|
|
# FIXME: if multiple hashes could match (e.g. lmhash vs nthash)
|
||
|
|
# this will only return first match. might want to do something
|
||
|
|
# about this in future, but for now only hashes with
|
||
|
|
# unique identifiers will work properly in a CryptContext.
|
||
|
|
# XXX: if all handlers have a unique prefix (e.g. all are MCF / LDAP),
|
||
|
|
# could use dict-lookup to speed up this search.
|
||
|
|
if not isinstance(hash, unicode_or_bytes_types):
|
||
|
|
raise ExpectedStringError(hash, "hash")
|
||
|
|
# type check of category - handled by _get_record_list()
|
||
|
|
for record in self._get_record_list(category):
|
||
|
|
if record.identify(hash):
|
||
|
|
return record
|
||
|
|
if not required:
|
||
|
|
return None
|
||
|
|
elif not self.schemes:
|
||
|
|
raise KeyError("no crypt algorithms supported")
|
||
|
|
else:
|
||
|
|
raise exc.UnknownHashError("hash could not be identified")
|
||
|
|
|
||
|
|
@memoized_property
|
||
|
|
def disabled_record(self):
|
||
|
|
for record in self._get_record_list(None):
|
||
|
|
if record.is_disabled:
|
||
|
|
return record
|
||
|
|
raise RuntimeError("no disabled hasher present "
|
||
|
|
"(perhaps add 'unix_disabled' to list of schemes?)")
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# serialization
|
||
|
|
#===================================================================
|
||
|
|
def iter_config(self, resolve=False):
|
||
|
|
"""regenerate original config.
|
||
|
|
|
||
|
|
this is an iterator which yields ``(cat,scheme,option),value`` items,
|
||
|
|
in the order they generally appear inside an INI file.
|
||
|
|
if interpreted as a dictionary, it should match the original
|
||
|
|
keywords passed to the CryptContext (aside from any canonization).
|
||
|
|
|
||
|
|
it's mainly used as the internal backend for most of the public
|
||
|
|
serialization methods.
|
||
|
|
"""
|
||
|
|
# grab various bits of data
|
||
|
|
scheme_options = self._scheme_options
|
||
|
|
context_options = self._context_options
|
||
|
|
scheme_keys = sorted(scheme_options)
|
||
|
|
context_keys = sorted(context_options)
|
||
|
|
|
||
|
|
# write loaded schemes (may differ from 'schemes' local var)
|
||
|
|
if 'schemes' in context_keys:
|
||
|
|
context_keys.remove("schemes")
|
||
|
|
value = self.handlers if resolve else self.schemes
|
||
|
|
if value:
|
||
|
|
yield (None, None, "schemes"), list(value)
|
||
|
|
|
||
|
|
# then run through config for each user category
|
||
|
|
for cat in (None,) + self.categories:
|
||
|
|
|
||
|
|
# write context options
|
||
|
|
for key in context_keys:
|
||
|
|
try:
|
||
|
|
value = context_options[key][cat]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
if isinstance(value, list):
|
||
|
|
value = list(value)
|
||
|
|
yield (cat, None, key), value
|
||
|
|
|
||
|
|
# write per-scheme options for all schemes.
|
||
|
|
for scheme in scheme_keys:
|
||
|
|
try:
|
||
|
|
kwds = scheme_options[scheme][cat]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
for key in sorted(kwds):
|
||
|
|
yield (cat, scheme, key), kwds[key]
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# eoc
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
#=============================================================================
|
||
|
|
# main CryptContext class
|
||
|
|
#=============================================================================
|
||
|
|
class CryptContext(object):
|
||
|
|
"""Helper for hashing & verifying passwords using multiple algorithms.
|
||
|
|
|
||
|
|
Instances of this class allow applications to choose a specific
|
||
|
|
set of hash algorithms which they wish to support, set limits and defaults
|
||
|
|
for the rounds and salt sizes those algorithms should use, flag
|
||
|
|
which algorithms should be deprecated, and automatically handle
|
||
|
|
migrating users to stronger hashes when they log in.
|
||
|
|
|
||
|
|
Basic usage::
|
||
|
|
|
||
|
|
>>> ctx = CryptContext(schemes=[...])
|
||
|
|
|
||
|
|
See the Passlib online documentation for details and full documentation.
|
||
|
|
"""
|
||
|
|
# FIXME: altering the configuration of this object isn't threadsafe,
|
||
|
|
# but is generally only done during application init, so not a major
|
||
|
|
# issue (just yet).
|
||
|
|
|
||
|
|
# XXX: would like some way to restrict the categories that are allowed,
|
||
|
|
# to restrict what the app OR the config can use.
|
||
|
|
|
||
|
|
# XXX: add wrap/unwrap callback hooks so app can mutate hash format?
|
||
|
|
|
||
|
|
# XXX: add method for detecting and warning user about schemes
|
||
|
|
# which don't have any good distinguishing marks?
|
||
|
|
# or greedy ones (unix_disabled, plaintext) which are not listed at the end?
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# instance attrs
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
# _CryptConfig instance holding current parsed config
|
||
|
|
_config = None
|
||
|
|
|
||
|
|
# copy of _config methods, stored in CryptContext instance for speed.
|
||
|
|
_get_record = None
|
||
|
|
_identify_record = None
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# secondary constructors
|
||
|
|
#===================================================================
|
||
|
|
@classmethod
|
||
|
|
def _norm_source(cls, source):
|
||
|
|
"""internal helper - accepts string, dict, or context"""
|
||
|
|
if isinstance(source, dict):
|
||
|
|
return cls(**source)
|
||
|
|
elif isinstance(source, cls):
|
||
|
|
return source
|
||
|
|
else:
|
||
|
|
self = cls()
|
||
|
|
self.load(source)
|
||
|
|
return self
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def from_string(cls, source, section="passlib", encoding="utf-8"):
|
||
|
|
"""create new CryptContext instance from an INI-formatted string.
|
||
|
|
|
||
|
|
:type source: unicode or bytes
|
||
|
|
:arg source:
|
||
|
|
string containing INI-formatted content.
|
||
|
|
|
||
|
|
:type section: str
|
||
|
|
:param section:
|
||
|
|
option name of section to read from, defaults to ``"passlib"``.
|
||
|
|
|
||
|
|
:type encoding: str
|
||
|
|
:arg encoding:
|
||
|
|
optional encoding used when source is bytes, defaults to ``"utf-8"``.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
new :class:`CryptContext` instance, configured based on the
|
||
|
|
parameters in the *source* string.
|
||
|
|
|
||
|
|
Usage example::
|
||
|
|
|
||
|
|
>>> from passlib.context import CryptContext
|
||
|
|
>>> context = CryptContext.from_string('''
|
||
|
|
... [passlib]
|
||
|
|
... schemes = sha256_crypt, des_crypt
|
||
|
|
... sha256_crypt__default_rounds = 30000
|
||
|
|
... ''')
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
|
||
|
|
.. seealso:: :meth:`to_string`, the inverse of this constructor.
|
||
|
|
"""
|
||
|
|
if not isinstance(source, unicode_or_bytes_types):
|
||
|
|
raise ExpectedTypeError(source, "unicode or bytes", "source")
|
||
|
|
self = cls(_autoload=False)
|
||
|
|
self.load(source, section=section, encoding=encoding)
|
||
|
|
return self
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def from_path(cls, path, section="passlib", encoding="utf-8"):
|
||
|
|
"""create new CryptContext instance from an INI-formatted file.
|
||
|
|
|
||
|
|
this functions exactly the same as :meth:`from_string`,
|
||
|
|
except that it loads from a local file.
|
||
|
|
|
||
|
|
:type path: str
|
||
|
|
:arg path:
|
||
|
|
path to local file containing INI-formatted config.
|
||
|
|
|
||
|
|
:type section: str
|
||
|
|
:param section:
|
||
|
|
option name of section to read from, defaults to ``"passlib"``.
|
||
|
|
|
||
|
|
:type encoding: str
|
||
|
|
:arg encoding:
|
||
|
|
encoding used to load file, defaults to ``"utf-8"``.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
new CryptContext instance, configured based on the parameters
|
||
|
|
stored in the file *path*.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
|
||
|
|
.. seealso:: :meth:`from_string` for an equivalent usage example.
|
||
|
|
"""
|
||
|
|
self = cls(_autoload=False)
|
||
|
|
self.load_path(path, section=section, encoding=encoding)
|
||
|
|
return self
|
||
|
|
|
||
|
|
def copy(self, **kwds):
|
||
|
|
"""Return copy of existing CryptContext instance.
|
||
|
|
|
||
|
|
This function returns a new CryptContext instance whose configuration
|
||
|
|
is exactly the same as the original, with the exception that any keywords
|
||
|
|
passed in will take precedence over the original settings.
|
||
|
|
As an example::
|
||
|
|
|
||
|
|
>>> from passlib.context import CryptContext
|
||
|
|
|
||
|
|
>>> # given an existing context...
|
||
|
|
>>> ctx1 = CryptContext(["sha256_crypt", "md5_crypt"])
|
||
|
|
|
||
|
|
>>> # copy can be used to make a clone, and update
|
||
|
|
>>> # some of the settings at the same time...
|
||
|
|
>>> ctx2 = custom_app_context.copy(default="md5_crypt")
|
||
|
|
|
||
|
|
>>> # and the original will be unaffected by the change
|
||
|
|
>>> ctx1.default_scheme()
|
||
|
|
"sha256_crypt"
|
||
|
|
>>> ctx2.default_scheme()
|
||
|
|
"md5_crypt"
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
This method was previously named :meth:`!replace`. That alias
|
||
|
|
has been deprecated, and will be removed in Passlib 1.8.
|
||
|
|
|
||
|
|
.. seealso:: :meth:`update`
|
||
|
|
"""
|
||
|
|
# XXX: it would be faster to store ref to self._config,
|
||
|
|
# but don't want to share config objects til sure
|
||
|
|
# can rely on them being immutable.
|
||
|
|
other = CryptContext(_autoload=False)
|
||
|
|
other.load(self)
|
||
|
|
if kwds:
|
||
|
|
other.load(kwds, update=True)
|
||
|
|
return other
|
||
|
|
|
||
|
|
def using(self, **kwds):
|
||
|
|
"""
|
||
|
|
alias for :meth:`copy`, to match PasswordHash.using()
|
||
|
|
"""
|
||
|
|
return self.copy(**kwds)
|
||
|
|
|
||
|
|
def replace(self, **kwds):
|
||
|
|
"""deprecated alias of :meth:`copy`"""
|
||
|
|
warn("CryptContext().replace() has been deprecated in Passlib 1.6, "
|
||
|
|
"and will be removed in Passlib 1.8, "
|
||
|
|
"it has been renamed to CryptContext().copy()",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
return self.copy(**kwds)
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# init
|
||
|
|
#===================================================================
|
||
|
|
def __init__(self, schemes=None,
|
||
|
|
# keyword only...
|
||
|
|
policy=_UNSET, # <-- deprecated
|
||
|
|
_autoload=True, **kwds):
|
||
|
|
# XXX: add ability to make flag certain contexts as immutable,
|
||
|
|
# e.g. the builtin passlib ones?
|
||
|
|
# XXX: add a name or import path for the contexts, to help out repr?
|
||
|
|
if schemes is not None:
|
||
|
|
kwds['schemes'] = schemes
|
||
|
|
if policy is not _UNSET:
|
||
|
|
warn("The CryptContext ``policy`` keyword has been deprecated as of Passlib 1.6, "
|
||
|
|
"and will be removed in Passlib 1.8; please use "
|
||
|
|
"``CryptContext.from_string()` or "
|
||
|
|
"``CryptContext.from_path()`` instead.",
|
||
|
|
DeprecationWarning)
|
||
|
|
if policy is None:
|
||
|
|
self.load(kwds)
|
||
|
|
elif isinstance(policy, CryptPolicy):
|
||
|
|
self.load(policy._context)
|
||
|
|
self.update(kwds)
|
||
|
|
else:
|
||
|
|
raise TypeError("policy must be a CryptPolicy instance")
|
||
|
|
elif _autoload:
|
||
|
|
self.load(kwds)
|
||
|
|
else:
|
||
|
|
assert not kwds, "_autoload=False and kwds are mutually exclusive"
|
||
|
|
|
||
|
|
# XXX: would this be useful?
|
||
|
|
##def __str__(self):
|
||
|
|
## if PY3:
|
||
|
|
## return self.to_string()
|
||
|
|
## else:
|
||
|
|
## return self.to_string().encode("utf-8")
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return "<CryptContext at 0x%0x>" % id(self)
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# deprecated policy object
|
||
|
|
#===================================================================
|
||
|
|
def _get_policy(self):
|
||
|
|
# The CryptPolicy class has been deprecated, so to support any
|
||
|
|
# legacy accesses, we create a stub policy object so .policy attr
|
||
|
|
# will continue to work.
|
||
|
|
#
|
||
|
|
# the code waits until app accesses a specific policy object attribute
|
||
|
|
# before issuing deprecation warning, so developer gets method-specific
|
||
|
|
# suggestion for how to upgrade.
|
||
|
|
|
||
|
|
# NOTE: making a copy of the context so the policy acts like a snapshot,
|
||
|
|
# to retain the pre-1.6 behavior.
|
||
|
|
return CryptPolicy(_internal_context=self.copy(), _stub_policy=True)
|
||
|
|
|
||
|
|
def _set_policy(self, policy):
|
||
|
|
warn("The CryptPolicy class and the ``context.policy`` attribute have "
|
||
|
|
"been deprecated as of Passlib 1.6, and will be removed in "
|
||
|
|
"Passlib 1.8; please use the ``context.load()`` and "
|
||
|
|
"``context.update()`` methods instead.",
|
||
|
|
DeprecationWarning, stacklevel=2)
|
||
|
|
if isinstance(policy, CryptPolicy):
|
||
|
|
self.load(policy._context)
|
||
|
|
else:
|
||
|
|
raise TypeError("expected CryptPolicy instance")
|
||
|
|
|
||
|
|
policy = property(_get_policy, _set_policy,
|
||
|
|
doc="[deprecated] returns CryptPolicy instance "
|
||
|
|
"tied to this CryptContext")
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# loading / updating configuration
|
||
|
|
#===================================================================
|
||
|
|
@staticmethod
|
||
|
|
def _parse_ini_stream(stream, section, filename):
|
||
|
|
"""helper read INI from stream, extract passlib section as dict"""
|
||
|
|
# NOTE: this expects a unicode stream under py3,
|
||
|
|
# and a utf-8 bytes stream under py2,
|
||
|
|
# allowing the resulting dict to always use native strings.
|
||
|
|
p = SafeConfigParser()
|
||
|
|
if PY3:
|
||
|
|
# python 3.2 deprecated readfp in favor of read_file
|
||
|
|
p.read_file(stream, filename)
|
||
|
|
else:
|
||
|
|
p.readfp(stream, filename)
|
||
|
|
# XXX: could change load() to accept list of items,
|
||
|
|
# and skip intermediate dict creation
|
||
|
|
return dict(p.items(section))
|
||
|
|
|
||
|
|
def load_path(self, path, update=False, section="passlib", encoding="utf-8"):
|
||
|
|
"""Load new configuration into CryptContext from a local file.
|
||
|
|
|
||
|
|
This function is a wrapper for :meth:`load` which
|
||
|
|
loads a configuration string from the local file *path*,
|
||
|
|
instead of an in-memory source. Its behavior and options
|
||
|
|
are otherwise identical to :meth:`!load` when provided with
|
||
|
|
an INI-formatted string.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
"""
|
||
|
|
def helper(stream):
|
||
|
|
kwds = self._parse_ini_stream(stream, section, path)
|
||
|
|
return self.load(kwds, update=update)
|
||
|
|
if PY3:
|
||
|
|
# decode to unicode, which load() expected under py3
|
||
|
|
with open(path, "rt", encoding=encoding) as stream:
|
||
|
|
return helper(stream)
|
||
|
|
elif encoding in ["utf-8", "ascii"]:
|
||
|
|
# keep as utf-8 bytes, which load() expects under py2
|
||
|
|
with open(path, "rb") as stream:
|
||
|
|
return helper(stream)
|
||
|
|
else:
|
||
|
|
# transcode to utf-8 bytes
|
||
|
|
with open(path, "rb") as fh:
|
||
|
|
tmp = fh.read().decode(encoding).encode("utf-8")
|
||
|
|
return helper(BytesIO(tmp))
|
||
|
|
|
||
|
|
def load(self, source, update=False, section="passlib", encoding="utf-8"):
|
||
|
|
"""Load new configuration into CryptContext, replacing existing config.
|
||
|
|
|
||
|
|
:arg source:
|
||
|
|
source of new configuration to load.
|
||
|
|
this value can be a number of different types:
|
||
|
|
|
||
|
|
* a :class:`!dict` object, or compatible Mapping
|
||
|
|
|
||
|
|
the key/value pairs will be interpreted the same
|
||
|
|
keywords for the :class:`CryptContext` class constructor.
|
||
|
|
|
||
|
|
* a :class:`!unicode` or :class:`!bytes` string
|
||
|
|
|
||
|
|
this will be interpreted as an INI-formatted file,
|
||
|
|
and appropriate key/value pairs will be loaded from
|
||
|
|
the specified *section*.
|
||
|
|
|
||
|
|
* another :class:`!CryptContext` object.
|
||
|
|
|
||
|
|
this will export a snapshot of its configuration
|
||
|
|
using :meth:`to_dict`.
|
||
|
|
|
||
|
|
:type update: bool
|
||
|
|
:param update:
|
||
|
|
By default, :meth:`load` will replace the existing configuration
|
||
|
|
entirely. If ``update=True``, it will preserve any existing
|
||
|
|
configuration options that are not overridden by the new source,
|
||
|
|
much like the :meth:`update` method.
|
||
|
|
|
||
|
|
:type section: str
|
||
|
|
:param section:
|
||
|
|
When parsing an INI-formatted string, :meth:`load` will look for
|
||
|
|
a section named ``"passlib"``. This option allows an alternate
|
||
|
|
section name to be used. Ignored when loading from a dictionary.
|
||
|
|
|
||
|
|
:type encoding: str
|
||
|
|
:param encoding:
|
||
|
|
Encoding to use when **source** is bytes.
|
||
|
|
Defaults to ``"utf-8"``. Ignored when loading from a dictionary.
|
||
|
|
|
||
|
|
.. deprecated:: 1.8
|
||
|
|
|
||
|
|
This keyword, and support for bytes input, will be dropped in Passlib 2.0
|
||
|
|
|
||
|
|
:raises TypeError:
|
||
|
|
* If the source cannot be identified.
|
||
|
|
* If an unknown / malformed keyword is encountered.
|
||
|
|
|
||
|
|
:raises ValueError:
|
||
|
|
If an invalid keyword value is encountered.
|
||
|
|
|
||
|
|
.. note::
|
||
|
|
|
||
|
|
If an error occurs during a :meth:`!load` call, the :class:`!CryptContext`
|
||
|
|
instance will be restored to the configuration it was in before
|
||
|
|
the :meth:`!load` call was made; this is to ensure it is
|
||
|
|
*never* left in an inconsistent state due to a load error.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
"""
|
||
|
|
#-----------------------------------------------------------
|
||
|
|
# autodetect source type, convert to dict
|
||
|
|
#-----------------------------------------------------------
|
||
|
|
parse_keys = True
|
||
|
|
if isinstance(source, unicode_or_bytes_types):
|
||
|
|
if PY3:
|
||
|
|
source = to_unicode(source, encoding, param="source")
|
||
|
|
else:
|
||
|
|
source = to_bytes(source, "utf-8", source_encoding=encoding,
|
||
|
|
param="source")
|
||
|
|
source = self._parse_ini_stream(NativeStringIO(source), section,
|
||
|
|
"<string passed to CryptContext.load()>")
|
||
|
|
elif isinstance(source, CryptContext):
|
||
|
|
# extract dict directly from config, so it can be merged later
|
||
|
|
source = dict(source._config.iter_config(resolve=True))
|
||
|
|
parse_keys = False
|
||
|
|
elif not hasattr(source, "items"):
|
||
|
|
# mappings are left alone, otherwise throw an error.
|
||
|
|
raise ExpectedTypeError(source, "string or dict", "source")
|
||
|
|
|
||
|
|
# XXX: add support for other iterable types, e.g. sequence of pairs?
|
||
|
|
|
||
|
|
#-----------------------------------------------------------
|
||
|
|
# parse dict keys into (category, scheme, option) format,
|
||
|
|
# and merge with existing configuration if needed.
|
||
|
|
#-----------------------------------------------------------
|
||
|
|
if parse_keys:
|
||
|
|
parse = self._parse_config_key
|
||
|
|
source = dict((parse(key), value)
|
||
|
|
for key, value in iteritems(source))
|
||
|
|
if update and self._config is not None:
|
||
|
|
# if updating, do nothing if source is empty,
|
||
|
|
if not source:
|
||
|
|
return
|
||
|
|
# otherwise overlay source on top of existing config
|
||
|
|
tmp = source
|
||
|
|
source = dict(self._config.iter_config(resolve=True))
|
||
|
|
source.update(tmp)
|
||
|
|
|
||
|
|
#-----------------------------------------------------------
|
||
|
|
# compile into _CryptConfig instance, and update state
|
||
|
|
#-----------------------------------------------------------
|
||
|
|
config = _CryptConfig(source)
|
||
|
|
self._config = config
|
||
|
|
self._reset_dummy_verify()
|
||
|
|
self._get_record = config.get_record
|
||
|
|
self._identify_record = config.identify_record
|
||
|
|
if config.context_kwds:
|
||
|
|
# (re-)enable method for this instance (in case ELSE clause below ran last load).
|
||
|
|
self.__dict__.pop("_strip_unused_context_kwds", None)
|
||
|
|
else:
|
||
|
|
# disable method for this instance, it's not needed.
|
||
|
|
self._strip_unused_context_kwds = None
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _parse_config_key(ckey):
|
||
|
|
"""helper used to parse ``cat__scheme__option`` keys into a tuple"""
|
||
|
|
# split string into 1-3 parts
|
||
|
|
assert isinstance(ckey, native_string_types)
|
||
|
|
parts = ckey.replace(".", "__").split("__")
|
||
|
|
count = len(parts)
|
||
|
|
if count == 1:
|
||
|
|
cat, scheme, key = None, None, parts[0]
|
||
|
|
elif count == 2:
|
||
|
|
cat = None
|
||
|
|
scheme, key = parts
|
||
|
|
elif count == 3:
|
||
|
|
cat, scheme, key = parts
|
||
|
|
else:
|
||
|
|
raise TypeError("keys must have less than 3 separators: %r" %
|
||
|
|
(ckey,))
|
||
|
|
# validate & normalize the parts
|
||
|
|
if cat == "default":
|
||
|
|
cat = None
|
||
|
|
elif not cat and cat is not None:
|
||
|
|
raise TypeError("empty category: %r" % ckey)
|
||
|
|
if scheme == "context":
|
||
|
|
scheme = None
|
||
|
|
elif not scheme and scheme is not None:
|
||
|
|
raise TypeError("empty scheme: %r" % ckey)
|
||
|
|
if not key:
|
||
|
|
raise TypeError("empty option: %r" % ckey)
|
||
|
|
return cat, scheme, key
|
||
|
|
|
||
|
|
def update(self, *args, **kwds):
|
||
|
|
"""Helper for quickly changing configuration.
|
||
|
|
|
||
|
|
This acts much like the :meth:`!dict.update` method:
|
||
|
|
it updates the context's configuration,
|
||
|
|
replacing the original value(s) for the specified keys,
|
||
|
|
and preserving the rest.
|
||
|
|
It accepts any :ref:`keyword <context-options>`
|
||
|
|
accepted by the :class:`!CryptContext` constructor.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
|
||
|
|
.. seealso:: :meth:`copy`
|
||
|
|
"""
|
||
|
|
if args:
|
||
|
|
if len(args) > 1:
|
||
|
|
raise TypeError("expected at most one positional argument")
|
||
|
|
if kwds:
|
||
|
|
raise TypeError("positional arg and keywords mutually exclusive")
|
||
|
|
self.load(args[0], update=True)
|
||
|
|
elif kwds:
|
||
|
|
self.load(kwds, update=True)
|
||
|
|
|
||
|
|
# XXX: make this public? even just as flag to load?
|
||
|
|
# FIXME: this function suffered some bitrot in 1.6.1,
|
||
|
|
# will need to be updated before works again.
|
||
|
|
##def _simplify(self):
|
||
|
|
## "helper to remove redundant/unused options"
|
||
|
|
## # don't do anything if no schemes are defined
|
||
|
|
## if not self._schemes:
|
||
|
|
## return
|
||
|
|
##
|
||
|
|
## def strip_items(target, filter):
|
||
|
|
## keys = [key for key,value in iteritems(target)
|
||
|
|
## if filter(key,value)]
|
||
|
|
## for key in keys:
|
||
|
|
## del target[key]
|
||
|
|
##
|
||
|
|
## # remove redundant default.
|
||
|
|
## defaults = self._default_schemes
|
||
|
|
## if defaults.get(None) == self._schemes[0]:
|
||
|
|
## del defaults[None]
|
||
|
|
##
|
||
|
|
## # remove options for unused schemes.
|
||
|
|
## scheme_options = self._scheme_options
|
||
|
|
## schemes = self._schemes + ("all",)
|
||
|
|
## strip_items(scheme_options, lambda k,v: k not in schemes)
|
||
|
|
##
|
||
|
|
## # remove rendundant cat defaults.
|
||
|
|
## cur = self.default_scheme()
|
||
|
|
## strip_items(defaults, lambda k,v: k and v==cur)
|
||
|
|
##
|
||
|
|
## # remove redundant category deprecations.
|
||
|
|
## # TODO: this should work w/ 'auto', but needs closer inspection
|
||
|
|
## deprecated = self._deprecated_schemes
|
||
|
|
## cur = self._deprecated_schemes.get(None)
|
||
|
|
## strip_items(deprecated, lambda k,v: k and v==cur)
|
||
|
|
##
|
||
|
|
## # remove redundant category options.
|
||
|
|
## for scheme, config in iteritems(scheme_options):
|
||
|
|
## if None in config:
|
||
|
|
## cur = config[None]
|
||
|
|
## strip_items(config, lambda k,v: k and v==cur)
|
||
|
|
##
|
||
|
|
## # XXX: anything else?
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# reading configuration
|
||
|
|
#===================================================================
|
||
|
|
def schemes(self, resolve=False, category=None, unconfigured=False):
|
||
|
|
"""return schemes loaded into this CryptContext instance.
|
||
|
|
|
||
|
|
:type resolve: bool
|
||
|
|
:arg resolve:
|
||
|
|
if ``True``, will return a tuple of :class:`~passlib.ifc.PasswordHash`
|
||
|
|
objects instead of their names.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
returns tuple of the schemes configured for this context
|
||
|
|
via the *schemes* option.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
This was previously available as ``CryptContext().policy.schemes()``
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`schemes <context-schemes-option>` option for usage example.
|
||
|
|
"""
|
||
|
|
# XXX: should resolv return records rather than handlers?
|
||
|
|
# or deprecate resolve keyword completely?
|
||
|
|
# offering up a .hashers Mapping in v1.8 would be great.
|
||
|
|
# NOTE: supporting 'category' and 'unconfigured' kwds as of 1.7
|
||
|
|
# just to pass through to .handler(), but not documenting them...
|
||
|
|
# may not need to put them to use.
|
||
|
|
schemes = self._config.schemes
|
||
|
|
if resolve:
|
||
|
|
return tuple(self.handler(scheme, category, unconfigured=unconfigured)
|
||
|
|
for scheme in schemes)
|
||
|
|
else:
|
||
|
|
return schemes
|
||
|
|
|
||
|
|
def default_scheme(self, category=None, resolve=False, unconfigured=False):
|
||
|
|
"""return name of scheme that :meth:`hash` will use by default.
|
||
|
|
|
||
|
|
:type resolve: bool
|
||
|
|
:arg resolve:
|
||
|
|
if ``True``, will return a :class:`~passlib.ifc.PasswordHash`
|
||
|
|
object instead of the name.
|
||
|
|
|
||
|
|
:type category: str or None
|
||
|
|
:param category:
|
||
|
|
Optional :ref:`user category <user-categories>`.
|
||
|
|
If specified, this will return the catgory-specific default scheme instead.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
name of the default scheme.
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`default <context-default-option>` option for usage example.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
|
||
|
|
.. versionchanged:: 1.7
|
||
|
|
|
||
|
|
This now returns a hasher configured with any CryptContext-specific
|
||
|
|
options (custom rounds settings, etc). Previously this returned
|
||
|
|
the base hasher from :mod:`passlib.hash`.
|
||
|
|
"""
|
||
|
|
# XXX: deprecate this in favor of .handler() or whatever it's replaced with?
|
||
|
|
# NOTE: supporting 'unconfigured' kwds as of 1.7
|
||
|
|
# just to pass through to .handler(), but not documenting them...
|
||
|
|
# may not need to put them to use.
|
||
|
|
hasher = self.handler(None, category, unconfigured=unconfigured)
|
||
|
|
return hasher if resolve else hasher.name
|
||
|
|
|
||
|
|
# XXX: need to decide if exposing this would be useful in any way
|
||
|
|
##def categories(self):
|
||
|
|
## """return user-categories with algorithm-specific options in this CryptContext.
|
||
|
|
##
|
||
|
|
## this will always return a tuple.
|
||
|
|
## if no categories besides the default category have been configured,
|
||
|
|
## the tuple will be empty.
|
||
|
|
## """
|
||
|
|
## return self._config.categories
|
||
|
|
|
||
|
|
# XXX: need to decide if exposing this would be useful to applications
|
||
|
|
# in any meaningful way that isn't already served by to_dict()
|
||
|
|
##def options(self, scheme, category=None):
|
||
|
|
## kwds, percat = self._config.get_options(scheme, category)
|
||
|
|
## return kwds
|
||
|
|
|
||
|
|
def handler(self, scheme=None, category=None, unconfigured=False):
|
||
|
|
"""helper to resolve name of scheme -> :class:`~passlib.ifc.PasswordHash` object used by scheme.
|
||
|
|
|
||
|
|
:arg scheme:
|
||
|
|
This should identify the scheme to lookup.
|
||
|
|
If omitted or set to ``None``, this will return the handler
|
||
|
|
for the default scheme.
|
||
|
|
|
||
|
|
:arg category:
|
||
|
|
If a user category is specified, and no scheme is provided,
|
||
|
|
it will use the default for that category.
|
||
|
|
Otherwise this parameter is ignored.
|
||
|
|
|
||
|
|
:param unconfigured:
|
||
|
|
|
||
|
|
By default, this returns a handler object whose .hash()
|
||
|
|
and .needs_update() methods will honor the configured
|
||
|
|
provided by CryptContext. See ``unconfigured=True``
|
||
|
|
to get the underlying handler from before any context-specific
|
||
|
|
configuration was applied.
|
||
|
|
|
||
|
|
:raises KeyError:
|
||
|
|
If the scheme does not exist OR is not being used within this context.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
:class:`~passlib.ifc.PasswordHash` object used to implement
|
||
|
|
the named scheme within this context (this will usually
|
||
|
|
be one of the objects from :mod:`passlib.hash`)
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
This was previously available as ``CryptContext().policy.get_handler()``
|
||
|
|
|
||
|
|
.. versionchanged:: 1.7
|
||
|
|
|
||
|
|
This now returns a hasher configured with any CryptContext-specific
|
||
|
|
options (custom rounds settings, etc). Previously this returned
|
||
|
|
the base hasher from :mod:`passlib.hash`.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
hasher = self._get_record(scheme, category)
|
||
|
|
if unconfigured:
|
||
|
|
return hasher._Context__orig_handler
|
||
|
|
else:
|
||
|
|
return hasher
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
if self._config.handlers:
|
||
|
|
raise KeyError("crypt algorithm not found in this "
|
||
|
|
"CryptContext instance: %r" % (scheme,))
|
||
|
|
else:
|
||
|
|
raise KeyError("no crypt algorithms loaded in this "
|
||
|
|
"CryptContext instance")
|
||
|
|
|
||
|
|
def _get_unregistered_handlers(self):
|
||
|
|
"""check if any handlers in this context aren't in the global registry"""
|
||
|
|
return tuple(handler for handler in self._config.handlers
|
||
|
|
if not _is_handler_registered(handler))
|
||
|
|
|
||
|
|
@property
|
||
|
|
def context_kwds(self):
|
||
|
|
"""
|
||
|
|
return :class:`!set` containing union of all :ref:`contextual keywords <context-keywords>`
|
||
|
|
supported by the handlers in this context.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6.6
|
||
|
|
"""
|
||
|
|
return self._config.context_kwds
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# exporting config
|
||
|
|
#===================================================================
|
||
|
|
@staticmethod
|
||
|
|
def _render_config_key(key):
|
||
|
|
"""convert 3-part config key to single string"""
|
||
|
|
cat, scheme, option = key
|
||
|
|
if cat:
|
||
|
|
return "%s__%s__%s" % (cat, scheme or "context", option)
|
||
|
|
elif scheme:
|
||
|
|
return "%s__%s" % (scheme, option)
|
||
|
|
else:
|
||
|
|
return option
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _render_ini_value(key, value):
|
||
|
|
"""render value to string suitable for INI file"""
|
||
|
|
# convert lists to comma separated lists
|
||
|
|
# (mainly 'schemes' & 'deprecated')
|
||
|
|
if isinstance(value, (list,tuple)):
|
||
|
|
value = ", ".join(value)
|
||
|
|
|
||
|
|
# convert numbers to strings
|
||
|
|
elif isinstance(value, num_types):
|
||
|
|
if isinstance(value, float) and key[2] == "vary_rounds":
|
||
|
|
value = ("%.2f" % value).rstrip("0") if value else "0"
|
||
|
|
else:
|
||
|
|
value = str(value)
|
||
|
|
|
||
|
|
assert isinstance(value, native_string_types), \
|
||
|
|
"expected string for key: %r %r" % (key, value)
|
||
|
|
|
||
|
|
# escape any percent signs.
|
||
|
|
return value.replace("%", "%%")
|
||
|
|
|
||
|
|
def to_dict(self, resolve=False):
|
||
|
|
"""Return current configuration as a dictionary.
|
||
|
|
|
||
|
|
:type resolve: bool
|
||
|
|
:arg resolve:
|
||
|
|
if ``True``, the ``schemes`` key will contain a list of
|
||
|
|
a :class:`~passlib.ifc.PasswordHash` objects instead of just
|
||
|
|
their names.
|
||
|
|
|
||
|
|
This method dumps the current configuration of the CryptContext
|
||
|
|
instance. The key/value pairs should be in the format accepted
|
||
|
|
by the :class:`!CryptContext` class constructor, in fact
|
||
|
|
``CryptContext(**myctx.to_dict())`` will create an exact copy of ``myctx``.
|
||
|
|
As an example::
|
||
|
|
|
||
|
|
>>> # you can dump the configuration of any crypt context...
|
||
|
|
>>> from passlib.apps import ldap_nocrypt_context
|
||
|
|
>>> ldap_nocrypt_context.to_dict()
|
||
|
|
{'schemes': ['ldap_salted_sha1',
|
||
|
|
'ldap_salted_md5',
|
||
|
|
'ldap_sha1',
|
||
|
|
'ldap_md5',
|
||
|
|
'ldap_plaintext']}
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
This was previously available as ``CryptContext().policy.to_dict()``
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`context-serialization-example` example in the tutorial.
|
||
|
|
"""
|
||
|
|
# XXX: should resolve default to conditional behavior
|
||
|
|
# based on presence of unregistered handlers?
|
||
|
|
render_key = self._render_config_key
|
||
|
|
return dict((render_key(key), value)
|
||
|
|
for key, value in self._config.iter_config(resolve))
|
||
|
|
|
||
|
|
def _write_to_parser(self, parser, section):
|
||
|
|
"""helper to write to ConfigParser instance"""
|
||
|
|
render_key = self._render_config_key
|
||
|
|
render_value = self._render_ini_value
|
||
|
|
parser.add_section(section)
|
||
|
|
for k,v in self._config.iter_config():
|
||
|
|
v = render_value(k, v)
|
||
|
|
k = render_key(k)
|
||
|
|
parser.set(section, k, v)
|
||
|
|
|
||
|
|
def to_string(self, section="passlib"):
|
||
|
|
"""serialize to INI format and return as unicode string.
|
||
|
|
|
||
|
|
:param section:
|
||
|
|
name of INI section to output, defaults to ``"passlib"``.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
CryptContext configuration, serialized to a INI unicode string.
|
||
|
|
|
||
|
|
This function acts exactly like :meth:`to_dict`, except that it
|
||
|
|
serializes all the contents into a single human-readable string,
|
||
|
|
which can be hand edited, and/or stored in a file. The
|
||
|
|
output of this method is accepted by :meth:`from_string`,
|
||
|
|
:meth:`from_path`, and :meth:`load`. As an example::
|
||
|
|
|
||
|
|
>>> # you can dump the configuration of any crypt context...
|
||
|
|
>>> from passlib.apps import ldap_nocrypt_context
|
||
|
|
>>> print ldap_nocrypt_context.to_string()
|
||
|
|
[passlib]
|
||
|
|
schemes = ldap_salted_sha1, ldap_salted_md5, ldap_sha1, ldap_md5, ldap_plaintext
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
This was previously available as ``CryptContext().policy.to_string()``
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`context-serialization-example` example in the tutorial.
|
||
|
|
"""
|
||
|
|
parser = SafeConfigParser()
|
||
|
|
self._write_to_parser(parser, section)
|
||
|
|
buf = NativeStringIO()
|
||
|
|
parser.write(buf)
|
||
|
|
unregistered = self._get_unregistered_handlers()
|
||
|
|
if unregistered:
|
||
|
|
buf.write((
|
||
|
|
"# NOTE: the %s handler(s) are not registered with Passlib,\n"
|
||
|
|
"# this string may not correctly reproduce the current configuration.\n\n"
|
||
|
|
) % ", ".join(repr(handler.name) for handler in unregistered))
|
||
|
|
out = buf.getvalue()
|
||
|
|
if not PY3:
|
||
|
|
out = out.decode("utf-8")
|
||
|
|
return out
|
||
|
|
|
||
|
|
# XXX: is this useful enough to enable?
|
||
|
|
##def write_to_path(self, path, section="passlib", update=False):
|
||
|
|
## "write to INI file"
|
||
|
|
## parser = ConfigParser()
|
||
|
|
## if update and os.path.exists(path):
|
||
|
|
## if not parser.read([path]):
|
||
|
|
## raise EnvironmentError("failed to read existing file")
|
||
|
|
## parser.remove_section(section)
|
||
|
|
## self._write_to_parser(parser, section)
|
||
|
|
## fh = file(path, "w")
|
||
|
|
## parser.write(fh)
|
||
|
|
## fh.close()
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# verify() hardening
|
||
|
|
# NOTE: this entire feature has been disabled.
|
||
|
|
# all contents of this section are NOOPs as of 1.7.1,
|
||
|
|
# and will be removed in 1.8.
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
mvt_estimate_max_samples = 20
|
||
|
|
mvt_estimate_min_samples = 10
|
||
|
|
mvt_estimate_max_time = 2
|
||
|
|
mvt_estimate_resolution = 0.01
|
||
|
|
harden_verify = None
|
||
|
|
min_verify_time = 0
|
||
|
|
|
||
|
|
def reset_min_verify_time(self):
|
||
|
|
self._reset_dummy_verify()
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# password hash api
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
# NOTE: all the following methods do is look up the appropriate
|
||
|
|
# custom handler for a given (scheme,category) combination,
|
||
|
|
# and hand off the real work to the handler itself,
|
||
|
|
# which is optimized for the specific (scheme,category) configuration.
|
||
|
|
#
|
||
|
|
# The custom handlers are cached inside the _CryptConfig
|
||
|
|
# instance stored in self._config, and are retrieved
|
||
|
|
# via get_record() and identify_record().
|
||
|
|
#
|
||
|
|
# _get_record() and _identify_record() are references
|
||
|
|
# to _config methods of the same name,
|
||
|
|
# stored in CryptContext for speed.
|
||
|
|
|
||
|
|
def _get_or_identify_record(self, hash, scheme=None, category=None):
|
||
|
|
"""return record based on scheme, or failing that, by identifying hash"""
|
||
|
|
if scheme:
|
||
|
|
if not isinstance(hash, unicode_or_bytes_types):
|
||
|
|
raise ExpectedStringError(hash, "hash")
|
||
|
|
return self._get_record(scheme, category)
|
||
|
|
else:
|
||
|
|
# hash typecheck handled by identify_record()
|
||
|
|
return self._identify_record(hash, category)
|
||
|
|
|
||
|
|
def _strip_unused_context_kwds(self, kwds, record):
|
||
|
|
"""
|
||
|
|
helper which removes any context keywords from **kwds**
|
||
|
|
that are known to be used by another scheme in this context,
|
||
|
|
but are NOT supported by handler specified by **record**.
|
||
|
|
|
||
|
|
.. note::
|
||
|
|
as optimization, load() will set this method to None on a per-instance basis
|
||
|
|
if there are no context kwds.
|
||
|
|
"""
|
||
|
|
if not kwds:
|
||
|
|
return
|
||
|
|
unused_kwds = self._config.context_kwds.difference(record.context_kwds)
|
||
|
|
for key in unused_kwds:
|
||
|
|
kwds.pop(key, None)
|
||
|
|
|
||
|
|
def needs_update(self, hash, scheme=None, category=None, secret=None):
|
||
|
|
"""Check if hash needs to be replaced for some reason,
|
||
|
|
in which case the secret should be re-hashed.
|
||
|
|
|
||
|
|
This function is the core of CryptContext's support for hash migration:
|
||
|
|
This function takes in a hash string, and checks the scheme,
|
||
|
|
number of rounds, and other properties against the current policy.
|
||
|
|
It returns ``True`` if the hash is using a deprecated scheme,
|
||
|
|
or is otherwise outside of the bounds specified by the policy
|
||
|
|
(e.g. the number of rounds is lower than :ref:`min_rounds <context-min-rounds-option>`
|
||
|
|
configuration for that algorithm).
|
||
|
|
If so, the password should be re-hashed using :meth:`hash`
|
||
|
|
Otherwise, it will return ``False``.
|
||
|
|
|
||
|
|
:type hash: unicode or bytes
|
||
|
|
:arg hash:
|
||
|
|
The hash string to examine.
|
||
|
|
|
||
|
|
:type scheme: str or None
|
||
|
|
:param scheme:
|
||
|
|
|
||
|
|
Optional scheme to use. Scheme must be one of the ones
|
||
|
|
configured for this context (see the
|
||
|
|
:ref:`schemes <context-schemes-option>` option).
|
||
|
|
If no scheme is specified, it will be identified
|
||
|
|
based on the value of *hash*.
|
||
|
|
|
||
|
|
.. deprecated:: 1.7
|
||
|
|
|
||
|
|
Support for this keyword is deprecated, and will be removed in Passlib 2.0.
|
||
|
|
|
||
|
|
:type category: str or None
|
||
|
|
:param category:
|
||
|
|
Optional :ref:`user category <user-categories>`.
|
||
|
|
If specified, this will cause any category-specific defaults to
|
||
|
|
be used when determining if the hash needs to be updated
|
||
|
|
(e.g. is below the minimum rounds).
|
||
|
|
|
||
|
|
:type secret: unicode, bytes, or None
|
||
|
|
:param secret:
|
||
|
|
Optional secret associated with the provided ``hash``.
|
||
|
|
This is not required, or even currently used for anything...
|
||
|
|
it's for forward-compatibility with any future
|
||
|
|
update checks that might need this information.
|
||
|
|
If provided, Passlib assumes the secret has already been
|
||
|
|
verified successfully against the hash.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
|
||
|
|
:returns: ``True`` if hash should be replaced, otherwise ``False``.
|
||
|
|
|
||
|
|
:raises ValueError:
|
||
|
|
If the hash did not match any of the configured :meth:`schemes`.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
This method was previously named :meth:`hash_needs_update`.
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`context-migration-example` example in the tutorial.
|
||
|
|
"""
|
||
|
|
if scheme is not None:
|
||
|
|
# TODO: offer replacement alternative.
|
||
|
|
# ``context.handler(scheme).needs_update()`` would work,
|
||
|
|
# but may deprecate .handler() in passlib 1.8.
|
||
|
|
warn("CryptContext.needs_update(): 'scheme' keyword is deprecated as of "
|
||
|
|
"Passlib 1.7, and will be removed in Passlib 2.0",
|
||
|
|
DeprecationWarning)
|
||
|
|
record = self._get_or_identify_record(hash, scheme, category)
|
||
|
|
return record.deprecated or record.needs_update(hash, secret=secret)
|
||
|
|
|
||
|
|
@deprecated_method(deprecated="1.6", removed="2.0", replacement="CryptContext.needs_update()")
|
||
|
|
def hash_needs_update(self, hash, scheme=None, category=None):
|
||
|
|
"""Legacy alias for :meth:`needs_update`.
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
This method was renamed to :meth:`!needs_update` in version 1.6.
|
||
|
|
This alias will be removed in version 2.0, and should only
|
||
|
|
be used for compatibility with Passlib 1.3 - 1.5.
|
||
|
|
"""
|
||
|
|
return self.needs_update(hash, scheme, category)
|
||
|
|
|
||
|
|
@deprecated_method(deprecated="1.7", removed="2.0")
|
||
|
|
def genconfig(self, scheme=None, category=None, **settings):
|
||
|
|
"""Generate a config string for specified scheme.
|
||
|
|
|
||
|
|
.. deprecated:: 1.7
|
||
|
|
|
||
|
|
This method will be removed in version 2.0, and should only
|
||
|
|
be used for compatibility with Passlib 1.3 - 1.6.
|
||
|
|
"""
|
||
|
|
record = self._get_record(scheme, category)
|
||
|
|
strip_unused = self._strip_unused_context_kwds
|
||
|
|
if strip_unused:
|
||
|
|
strip_unused(settings, record)
|
||
|
|
return record.genconfig(**settings)
|
||
|
|
|
||
|
|
@deprecated_method(deprecated="1.7", removed="2.0")
|
||
|
|
def genhash(self, secret, config, scheme=None, category=None, **kwds):
|
||
|
|
"""Generate hash for the specified secret using another hash.
|
||
|
|
|
||
|
|
.. deprecated:: 1.7
|
||
|
|
|
||
|
|
This method will be removed in version 2.0, and should only
|
||
|
|
be used for compatibility with Passlib 1.3 - 1.6.
|
||
|
|
"""
|
||
|
|
record = self._get_or_identify_record(config, scheme, category)
|
||
|
|
strip_unused = self._strip_unused_context_kwds
|
||
|
|
if strip_unused:
|
||
|
|
strip_unused(kwds, record)
|
||
|
|
return record.genhash(secret, config, **kwds)
|
||
|
|
|
||
|
|
def identify(self, hash, category=None, resolve=False, required=False,
|
||
|
|
unconfigured=False):
|
||
|
|
"""Attempt to identify which algorithm the hash belongs to.
|
||
|
|
|
||
|
|
Note that this will only consider the algorithms
|
||
|
|
currently configured for this context
|
||
|
|
(see the :ref:`schemes <context-schemes-option>` option).
|
||
|
|
All registered algorithms will be checked, from first to last,
|
||
|
|
and whichever one positively identifies the hash first will be returned.
|
||
|
|
|
||
|
|
:type hash: unicode or bytes
|
||
|
|
:arg hash:
|
||
|
|
The hash string to test.
|
||
|
|
|
||
|
|
:type category: str or None
|
||
|
|
:param category:
|
||
|
|
Optional :ref:`user category <user-categories>`.
|
||
|
|
Ignored by this function, this parameter
|
||
|
|
is provided for symmetry with the other methods.
|
||
|
|
|
||
|
|
:type resolve: bool
|
||
|
|
:param resolve:
|
||
|
|
If ``True``, returns the hash handler itself,
|
||
|
|
instead of the name of the hash.
|
||
|
|
|
||
|
|
:type required: bool
|
||
|
|
:param required:
|
||
|
|
If ``True``, this will raise a ValueError if the hash
|
||
|
|
cannot be identified, instead of returning ``None``.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
The handler which first identifies the hash,
|
||
|
|
or ``None`` if none of the algorithms identify the hash.
|
||
|
|
"""
|
||
|
|
record = self._identify_record(hash, category, required)
|
||
|
|
if record is None:
|
||
|
|
return None
|
||
|
|
elif resolve:
|
||
|
|
if unconfigured:
|
||
|
|
return record._Context__orig_handler
|
||
|
|
else:
|
||
|
|
return record
|
||
|
|
else:
|
||
|
|
return record.name
|
||
|
|
|
||
|
|
def hash(self, secret, scheme=None, category=None, **kwds):
|
||
|
|
"""run secret through selected algorithm, returning resulting hash.
|
||
|
|
|
||
|
|
:type secret: unicode or bytes
|
||
|
|
:arg secret:
|
||
|
|
the password to hash.
|
||
|
|
|
||
|
|
:type scheme: str or None
|
||
|
|
:param scheme:
|
||
|
|
|
||
|
|
Optional scheme to use. Scheme must be one of the ones
|
||
|
|
configured for this context (see the
|
||
|
|
:ref:`schemes <context-schemes-option>` option).
|
||
|
|
If no scheme is specified, the configured default
|
||
|
|
will be used.
|
||
|
|
|
||
|
|
.. deprecated:: 1.7
|
||
|
|
|
||
|
|
Support for this keyword is deprecated, and will be removed in Passlib 2.0.
|
||
|
|
|
||
|
|
:type category: str or None
|
||
|
|
:param category:
|
||
|
|
Optional :ref:`user category <user-categories>`.
|
||
|
|
If specified, this will cause any category-specific defaults to
|
||
|
|
be used when hashing the password (e.g. different default scheme,
|
||
|
|
different default rounds values, etc).
|
||
|
|
|
||
|
|
:param \\*\\*kwds:
|
||
|
|
All other keyword options are passed to the selected algorithm's
|
||
|
|
:meth:`PasswordHash.hash() <passlib.ifc.PasswordHash.hash>` method.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
The secret as encoded by the specified algorithm and options.
|
||
|
|
The return value will always be a :class:`!str`.
|
||
|
|
|
||
|
|
:raises TypeError, ValueError:
|
||
|
|
* If any of the arguments have an invalid type or value.
|
||
|
|
This includes any keywords passed to the underlying hash's
|
||
|
|
:meth:`PasswordHash.hash() <passlib.ifc.PasswordHash.hash>` method.
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`context-basic-example` example in the tutorial
|
||
|
|
"""
|
||
|
|
# XXX: could insert normalization to preferred unicode encoding here
|
||
|
|
if scheme is not None:
|
||
|
|
# TODO: offer replacement alternative.
|
||
|
|
# ``context.handler(scheme).hash()`` would work,
|
||
|
|
# but may deprecate .handler() in passlib 1.8.
|
||
|
|
warn("CryptContext.hash(): 'scheme' keyword is deprecated as of "
|
||
|
|
"Passlib 1.7, and will be removed in Passlib 2.0",
|
||
|
|
DeprecationWarning)
|
||
|
|
record = self._get_record(scheme, category)
|
||
|
|
strip_unused = self._strip_unused_context_kwds
|
||
|
|
if strip_unused:
|
||
|
|
strip_unused(kwds, record)
|
||
|
|
return record.hash(secret, **kwds)
|
||
|
|
|
||
|
|
@deprecated_method(deprecated="1.7", removed="2.0", replacement="CryptContext.hash()")
|
||
|
|
def encrypt(self, *args, **kwds):
|
||
|
|
"""
|
||
|
|
Legacy alias for :meth:`hash`.
|
||
|
|
|
||
|
|
.. deprecated:: 1.7
|
||
|
|
This method was renamed to :meth:`!hash` in version 1.7.
|
||
|
|
This alias will be removed in version 2.0, and should only
|
||
|
|
be used for compatibility with Passlib 1.3 - 1.6.
|
||
|
|
"""
|
||
|
|
return self.hash(*args, **kwds)
|
||
|
|
|
||
|
|
def verify(self, secret, hash, scheme=None, category=None, **kwds):
|
||
|
|
"""verify secret against an existing hash.
|
||
|
|
|
||
|
|
If no scheme is specified, this will attempt to identify
|
||
|
|
the scheme based on the contents of the provided hash
|
||
|
|
(limited to the schemes configured for this context).
|
||
|
|
It will then check whether the password verifies against the hash.
|
||
|
|
|
||
|
|
:type secret: unicode or bytes
|
||
|
|
:arg secret:
|
||
|
|
the secret to verify
|
||
|
|
|
||
|
|
:type hash: unicode or bytes
|
||
|
|
:arg hash:
|
||
|
|
hash string to compare to
|
||
|
|
|
||
|
|
if ``None`` is passed in, this will be treated as "never verifying"
|
||
|
|
|
||
|
|
:type scheme: str
|
||
|
|
:param scheme:
|
||
|
|
Optionally force context to use specific scheme.
|
||
|
|
This is usually not needed, as most hashes can be unambiguously
|
||
|
|
identified. Scheme must be one of the ones configured
|
||
|
|
for this context
|
||
|
|
(see the :ref:`schemes <context-schemes-option>` option).
|
||
|
|
|
||
|
|
.. deprecated:: 1.7
|
||
|
|
|
||
|
|
Support for this keyword is deprecated, and will be removed in Passlib 2.0.
|
||
|
|
|
||
|
|
:type category: str or None
|
||
|
|
:param category:
|
||
|
|
Optional :ref:`user category <user-categories>` string.
|
||
|
|
This is mainly used when generating new hashes, it has little
|
||
|
|
effect when verifying; this keyword is mainly provided for symmetry.
|
||
|
|
|
||
|
|
:param \\*\\*kwds:
|
||
|
|
All additional keywords are passed to the appropriate handler,
|
||
|
|
and should match its :attr:`~passlib.ifc.PasswordHash.context_kwds`.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
``True`` if the password matched the hash, else ``False``.
|
||
|
|
|
||
|
|
:raises ValueError:
|
||
|
|
* if the hash did not match any of the configured :meth:`schemes`.
|
||
|
|
|
||
|
|
* if any of the arguments have an invalid value (this includes
|
||
|
|
any keywords passed to the underlying hash's
|
||
|
|
:meth:`PasswordHash.verify() <passlib.ifc.PasswordHash.verify>` method).
|
||
|
|
|
||
|
|
:raises TypeError:
|
||
|
|
* if any of the arguments have an invalid type (this includes
|
||
|
|
any keywords passed to the underlying hash's
|
||
|
|
:meth:`PasswordHash.verify() <passlib.ifc.PasswordHash.verify>` method).
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`context-basic-example` example in the tutorial
|
||
|
|
"""
|
||
|
|
# XXX: could insert normalization to preferred unicode encoding here
|
||
|
|
# XXX: what about supporting a setter() callback ala django 1.4 ?
|
||
|
|
if scheme is not None:
|
||
|
|
# TODO: offer replacement alternative.
|
||
|
|
# ``context.handler(scheme).verify()`` would work,
|
||
|
|
# but may deprecate .handler() in passlib 1.8.
|
||
|
|
warn("CryptContext.verify(): 'scheme' keyword is deprecated as of "
|
||
|
|
"Passlib 1.7, and will be removed in Passlib 2.0",
|
||
|
|
DeprecationWarning)
|
||
|
|
if hash is None:
|
||
|
|
# convenience feature -- let apps pass in hash=None when user
|
||
|
|
# isn't found / has no hash; useful because it invokes dummy_verify()
|
||
|
|
self.dummy_verify()
|
||
|
|
return False
|
||
|
|
record = self._get_or_identify_record(hash, scheme, category)
|
||
|
|
strip_unused = self._strip_unused_context_kwds
|
||
|
|
if strip_unused:
|
||
|
|
strip_unused(kwds, record)
|
||
|
|
return record.verify(secret, hash, **kwds)
|
||
|
|
|
||
|
|
def verify_and_update(self, secret, hash, scheme=None, category=None, **kwds):
|
||
|
|
"""verify password and re-hash the password if needed, all in a single call.
|
||
|
|
|
||
|
|
This is a convenience method which takes care of all the following:
|
||
|
|
first it verifies the password (:meth:`~CryptContext.verify`), if this is successfull
|
||
|
|
it checks if the hash needs updating (:meth:`~CryptContext.needs_update`), and if so,
|
||
|
|
re-hashes the password (:meth:`~CryptContext.hash`), returning the replacement hash.
|
||
|
|
This series of steps is a very common task for applications
|
||
|
|
which wish to update deprecated hashes, and this call takes
|
||
|
|
care of all 3 steps efficiently.
|
||
|
|
|
||
|
|
:type secret: unicode or bytes
|
||
|
|
:arg secret:
|
||
|
|
the secret to verify
|
||
|
|
|
||
|
|
:type secret: unicode or bytes
|
||
|
|
:arg hash:
|
||
|
|
hash string to compare to.
|
||
|
|
|
||
|
|
if ``None`` is passed in, this will be treated as "never verifying"
|
||
|
|
|
||
|
|
:type scheme: str
|
||
|
|
:param scheme:
|
||
|
|
Optionally force context to use specific scheme.
|
||
|
|
This is usually not needed, as most hashes can be unambiguously
|
||
|
|
identified. Scheme must be one of the ones configured
|
||
|
|
for this context
|
||
|
|
(see the :ref:`schemes <context-schemes-option>` option).
|
||
|
|
|
||
|
|
.. deprecated:: 1.7
|
||
|
|
|
||
|
|
Support for this keyword is deprecated, and will be removed in Passlib 2.0.
|
||
|
|
|
||
|
|
:type category: str or None
|
||
|
|
:param category:
|
||
|
|
Optional :ref:`user category <user-categories>`.
|
||
|
|
If specified, this will cause any category-specific defaults to
|
||
|
|
be used if the password has to be re-hashed.
|
||
|
|
|
||
|
|
:param \\*\\*kwds:
|
||
|
|
all additional keywords are passed to the appropriate handler,
|
||
|
|
and should match that hash's
|
||
|
|
:attr:`PasswordHash.context_kwds <passlib.ifc.PasswordHash.context_kwds>`.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
This function returns a tuple containing two elements:
|
||
|
|
``(verified, replacement_hash)``. The first is a boolean
|
||
|
|
flag indicating whether the password verified,
|
||
|
|
and the second an optional replacement hash.
|
||
|
|
The tuple will always match one of the following 3 cases:
|
||
|
|
|
||
|
|
* ``(False, None)`` indicates the secret failed to verify.
|
||
|
|
* ``(True, None)`` indicates the secret verified correctly,
|
||
|
|
and the hash does not need updating.
|
||
|
|
* ``(True, str)`` indicates the secret verified correctly,
|
||
|
|
but the current hash needs to be updated. The :class:`!str`
|
||
|
|
will be the freshly generated hash, to replace the old one.
|
||
|
|
|
||
|
|
:raises TypeError, ValueError:
|
||
|
|
For the same reasons as :meth:`verify`.
|
||
|
|
|
||
|
|
.. seealso:: the :ref:`context-migration-example` example in the tutorial.
|
||
|
|
"""
|
||
|
|
# XXX: could insert normalization to preferred unicode encoding here.
|
||
|
|
if scheme is not None:
|
||
|
|
warn("CryptContext.verify(): 'scheme' keyword is deprecated as of "
|
||
|
|
"Passlib 1.7, and will be removed in Passlib 2.0",
|
||
|
|
DeprecationWarning)
|
||
|
|
if hash is None:
|
||
|
|
# convenience feature -- let apps pass in hash=None when user
|
||
|
|
# isn't found / has no hash; useful because it invokes dummy_verify()
|
||
|
|
self.dummy_verify()
|
||
|
|
return False, None
|
||
|
|
record = self._get_or_identify_record(hash, scheme, category)
|
||
|
|
strip_unused = self._strip_unused_context_kwds
|
||
|
|
if strip_unused and kwds:
|
||
|
|
clean_kwds = kwds.copy()
|
||
|
|
strip_unused(clean_kwds, record)
|
||
|
|
else:
|
||
|
|
clean_kwds = kwds
|
||
|
|
# XXX: if record is default scheme, could extend PasswordHash
|
||
|
|
# api to combine verify & needs_update to single call,
|
||
|
|
# potentially saving some round-trip parsing.
|
||
|
|
# but might make these codepaths more complex...
|
||
|
|
if not record.verify(secret, hash, **clean_kwds):
|
||
|
|
return False, None
|
||
|
|
elif record.deprecated or record.needs_update(hash, secret=secret):
|
||
|
|
# NOTE: we re-hash with default scheme, not current one.
|
||
|
|
return True, self.hash(secret, category=category, **kwds)
|
||
|
|
else:
|
||
|
|
return True, None
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# missing-user helper
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
#: secret used for dummy_verify()
|
||
|
|
_dummy_secret = "too many secrets"
|
||
|
|
|
||
|
|
@memoized_property
|
||
|
|
def _dummy_hash(self):
|
||
|
|
"""
|
||
|
|
precalculated hash for dummy_verify() to use
|
||
|
|
"""
|
||
|
|
return self.hash(self._dummy_secret)
|
||
|
|
|
||
|
|
def _reset_dummy_verify(self):
|
||
|
|
"""
|
||
|
|
flush memoized values used by dummy_verify()
|
||
|
|
"""
|
||
|
|
type(self)._dummy_hash.clear_cache(self)
|
||
|
|
|
||
|
|
def dummy_verify(self, elapsed=0):
|
||
|
|
"""
|
||
|
|
Helper that applications can call when user wasn't found,
|
||
|
|
in order to simulate time it would take to hash a password.
|
||
|
|
|
||
|
|
Runs verify() against a dummy hash, to simulate verification
|
||
|
|
of a real account password.
|
||
|
|
|
||
|
|
:param elapsed:
|
||
|
|
|
||
|
|
.. deprecated:: 1.7.1
|
||
|
|
|
||
|
|
this option is ignored, and will be removed in passlib 1.8.
|
||
|
|
|
||
|
|
.. versionadded:: 1.7
|
||
|
|
"""
|
||
|
|
self.verify(self._dummy_secret, self._dummy_hash)
|
||
|
|
return False
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# disabled hash support
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
def is_enabled(self, hash):
|
||
|
|
"""
|
||
|
|
test if hash represents a usuable password --
|
||
|
|
i.e. does not represent an unusuable password such as ``"!"``,
|
||
|
|
which is recognized by the :class:`~passlib.hash.unix_disabled` hash.
|
||
|
|
|
||
|
|
:raises ValueError:
|
||
|
|
if the hash is not recognized
|
||
|
|
(typically solved by adding ``unix_disabled`` to the list of schemes).
|
||
|
|
"""
|
||
|
|
return not self._identify_record(hash, None).is_disabled
|
||
|
|
|
||
|
|
def disable(self, hash=None):
|
||
|
|
"""
|
||
|
|
return a string to disable logins for user,
|
||
|
|
usually by returning a non-verifying string such as ``"!"``.
|
||
|
|
|
||
|
|
:param hash:
|
||
|
|
Callers can optionally provide the account's existing hash.
|
||
|
|
Some disabled handlers (such as :class:`!unix_disabled`)
|
||
|
|
will encode this into the returned value,
|
||
|
|
so that it can be recovered via :meth:`enable`.
|
||
|
|
|
||
|
|
:raises RuntimeError:
|
||
|
|
if this function is called w/o a disabled hasher
|
||
|
|
(such as :class:`~passlib.hash.unix_disabled`) included
|
||
|
|
in the list of schemes.
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
hash string which will be recognized as valid by the context,
|
||
|
|
but is guaranteed to not validate against *any* password.
|
||
|
|
"""
|
||
|
|
record = self._config.disabled_record
|
||
|
|
assert record.is_disabled
|
||
|
|
return record.disable(hash)
|
||
|
|
|
||
|
|
def enable(self, hash):
|
||
|
|
"""
|
||
|
|
inverse of :meth:`disable` --
|
||
|
|
attempts to recover original hash which was converted
|
||
|
|
by a :meth:`!disable` call into a disabled hash --
|
||
|
|
thus restoring the user's original password.
|
||
|
|
|
||
|
|
:raises ValueError:
|
||
|
|
if original hash not present, or if the disabled handler doesn't
|
||
|
|
support encoding the original hash (e.g. ``django_disabled``)
|
||
|
|
|
||
|
|
:returns:
|
||
|
|
the original hash.
|
||
|
|
"""
|
||
|
|
record = self._identify_record(hash, None)
|
||
|
|
if record.is_disabled:
|
||
|
|
# XXX: should we throw error if result can't be identified by context?
|
||
|
|
return record.enable(hash)
|
||
|
|
else:
|
||
|
|
# hash wasn't a disabled hash, so return unchanged
|
||
|
|
return hash
|
||
|
|
|
||
|
|
#===================================================================
|
||
|
|
# eoc
|
||
|
|
#===================================================================
|
||
|
|
|
||
|
|
class LazyCryptContext(CryptContext):
|
||
|
|
"""CryptContext subclass which doesn't load handlers until needed.
|
||
|
|
|
||
|
|
This is a subclass of CryptContext which takes in a set of arguments
|
||
|
|
exactly like CryptContext, but won't import any handlers
|
||
|
|
(or even parse its arguments) until
|
||
|
|
the first time one of its methods is accessed.
|
||
|
|
|
||
|
|
:arg schemes:
|
||
|
|
The first positional argument can be a list of schemes, or omitted,
|
||
|
|
just like CryptContext.
|
||
|
|
|
||
|
|
:param onload:
|
||
|
|
|
||
|
|
If a callable is passed in via this keyword,
|
||
|
|
it will be invoked at lazy-load time
|
||
|
|
with the following signature:
|
||
|
|
``onload(**kwds) -> kwds``;
|
||
|
|
where ``kwds`` is all the additional kwds passed to LazyCryptContext.
|
||
|
|
It should perform any additional deferred initialization,
|
||
|
|
and return the final dict of options to be passed to CryptContext.
|
||
|
|
|
||
|
|
.. versionadded:: 1.6
|
||
|
|
|
||
|
|
:param create_policy:
|
||
|
|
|
||
|
|
.. deprecated:: 1.6
|
||
|
|
This option will be removed in Passlib 1.8,
|
||
|
|
applications should use ``onload`` instead.
|
||
|
|
|
||
|
|
:param kwds:
|
||
|
|
|
||
|
|
All additional keywords are passed to CryptContext;
|
||
|
|
or to the *onload* function (if provided).
|
||
|
|
|
||
|
|
This is mainly used internally by modules such as :mod:`passlib.apps`,
|
||
|
|
which define a large number of contexts, but only a few of them will be needed
|
||
|
|
at any one time. Use of this class saves the memory needed to import
|
||
|
|
the specified handlers until the context instance is actually accessed.
|
||
|
|
As well, it allows constructing a context at *module-init* time,
|
||
|
|
but using :func:`!onload()` to provide dynamic configuration
|
||
|
|
at *application-run* time.
|
||
|
|
|
||
|
|
.. note::
|
||
|
|
This class is only useful if you're referencing handler objects by name,
|
||
|
|
and don't want them imported until runtime. If you want to have the config
|
||
|
|
validated before your application runs, or are passing in already-imported
|
||
|
|
handler instances, you should use :class:`CryptContext` instead.
|
||
|
|
|
||
|
|
.. versionadded:: 1.4
|
||
|
|
"""
|
||
|
|
_lazy_kwds = None
|
||
|
|
|
||
|
|
# NOTE: the way this class works changed in 1.6.
|
||
|
|
# previously it just called _lazy_init() when ``.policy`` was
|
||
|
|
# first accessed. now that is done whenever any of the public
|
||
|
|
# attributes are accessed, and the class itself is changed
|
||
|
|
# to a regular CryptContext, to remove the overhead once it's unneeded.
|
||
|
|
|
||
|
|
def __init__(self, schemes=None, **kwds):
|
||
|
|
if schemes is not None:
|
||
|
|
kwds['schemes'] = schemes
|
||
|
|
self._lazy_kwds = kwds
|
||
|
|
|
||
|
|
def _lazy_init(self):
|
||
|
|
kwds = self._lazy_kwds
|
||
|
|
if 'create_policy' in kwds:
|
||
|
|
warn("The CryptPolicy class, and LazyCryptContext's "
|
||
|
|
"``create_policy`` keyword have been deprecated as of "
|
||
|
|
"Passlib 1.6, and will be removed in Passlib 1.8; "
|
||
|
|
"please use the ``onload`` keyword instead.",
|
||
|
|
DeprecationWarning)
|
||
|
|
create_policy = kwds.pop("create_policy")
|
||
|
|
result = create_policy(**kwds)
|
||
|
|
policy = CryptPolicy.from_source(result, _warn=False)
|
||
|
|
kwds = policy._context.to_dict()
|
||
|
|
elif 'onload' in kwds:
|
||
|
|
onload = kwds.pop("onload")
|
||
|
|
kwds = onload(**kwds)
|
||
|
|
del self._lazy_kwds
|
||
|
|
super(LazyCryptContext, self).__init__(**kwds)
|
||
|
|
self.__class__ = CryptContext
|
||
|
|
|
||
|
|
def __getattribute__(self, attr):
|
||
|
|
if (not attr.startswith("_") or attr.startswith("__")) and \
|
||
|
|
self._lazy_kwds is not None:
|
||
|
|
self._lazy_init()
|
||
|
|
return object.__getattribute__(self, attr)
|
||
|
|
|
||
|
|
#=============================================================================
|
||
|
|
# eof
|
||
|
|
#=============================================================================
|