Module exchangelib.credentials
Implements an Exchange user object and access types. Exchange provides two different ways of granting access for a login to a specific account. Impersonation is used mainly for service accounts that connect via EWS. Delegate is used for ad-hoc access e.g. granted manually by the user. See https://docs.microsoft.com/en-us/exchange/client-developer/exchange-web-services/impersonation-and-ews-in-exchange
Expand source code
"""
Implements an Exchange user object and access types. Exchange provides two different ways of granting access for a
login to a specific account. Impersonation is used mainly for service accounts that connect via EWS. Delegate is used
for ad-hoc access e.g. granted manually by the user.
See https://docs.microsoft.com/en-us/exchange/client-developer/exchange-web-services/impersonation-and-ews-in-exchange
"""
import abc
import logging
from threading import RLock
from oauthlib.oauth2 import OAuth2Token
from .errors import InvalidTypeError
log = logging.getLogger(__name__)
IMPERSONATION = "impersonation"
DELEGATE = "delegate"
ACCESS_TYPES = (IMPERSONATION, DELEGATE)
class BaseCredentials(metaclass=abc.ABCMeta):
"""Base for credential storage.
Establishes a method for refreshing credentials (mostly useful with OAuth, which expires tokens relatively
frequently) and provides a lock for synchronizing access to the object around refreshes.
"""
def __init__(self):
self._lock = RLock()
@property
def lock(self):
return self._lock
@abc.abstractmethod
def refresh(self, session):
"""Obtain a new set of valid credentials. This is mostly intended to support OAuth token refreshing, which can
happen in long- running applications or those that cache access tokens and so might start with a token close to
expiration.
:param session: requests session asking for refreshed credentials
:return:
"""
def _get_hash_values(self):
return (getattr(self, k) for k in self.__dict__ if k != "_lock")
def __eq__(self, other):
return all(getattr(self, k) == getattr(other, k) for k in self.__dict__ if k != "_lock")
def __hash__(self):
return hash(tuple(self._get_hash_values()))
def __getstate__(self):
# The lock cannot be pickled
state = self.__dict__.copy()
del state["_lock"]
return state
def __setstate__(self, state):
# Restore the lock
self.__dict__.update(state)
self._lock = RLock()
class Credentials(BaseCredentials):
r"""Keeps login info the way Exchange likes it.
Usernames for authentication are of one of these forms:
* PrimarySMTPAddress
* WINDOMAIN\username
* User Principal Name (UPN)
password: Clear-text password
"""
EMAIL = "email"
DOMAIN = "domain"
UPN = "upn"
def __init__(self, username, password):
super().__init__()
if username.count("@") == 1:
self.type = self.EMAIL
elif username.count("\\") == 1:
self.type = self.DOMAIN
else:
self.type = self.UPN
self.username = username
self.password = password
def refresh(self, session):
pass
def __repr__(self):
return self.__class__.__name__ + repr((self.username, "********"))
def __str__(self):
return self.username
class OAuth2Credentials(BaseCredentials):
"""Login info for OAuth 2.0 client credentials authentication, as well as a base for other OAuth 2.0 grant types.
This is primarily useful for in-house applications accessing data from a single Microsoft account. For applications
that will access multiple tenants' data, the client credentials flow does not give the application enough
information to restrict end users' access to the appropriate account. Use OAuth2AuthorizationCodeCredentials and
the associated auth code grant type for multi-tenant applications.
"""
def __init__(self, client_id, client_secret, tenant_id=None, identity=None):
"""
:param client_id: ID of an authorized OAuth application, required for automatic token fetching and refreshing
:param client_secret: Secret associated with the OAuth application
:param tenant_id: Microsoft tenant ID of the account to access
:param identity: An Identity object representing the account that these credentials are connected to.
"""
super().__init__()
self.client_id = client_id
self.client_secret = client_secret
self.tenant_id = tenant_id
self.identity = identity
# When set, access_token is a dict (or an oauthlib.oauth2.OAuth2Token, which is also a dict)
self.access_token = None
def refresh(self, session):
# Creating a new session gets a new access token, so there's no work here to refresh the credentials. This
# implementation just makes sure we don't raise a NotImplementedError.
pass
def on_token_auto_refreshed(self, access_token):
"""Set the access_token. Called after the access token is refreshed (requests-oauthlib can automatically
refresh tokens if given an OAuth client ID and secret, so this is how our copy of the token stays up-to-date).
Applications that cache access tokens can override this to store the new token - just remember to call the
super() method.
:param access_token: New token obtained by refreshing
"""
# Ensure we don't update the object in the middle of a new session being created, which could cause a race.
if not isinstance(access_token, dict):
raise InvalidTypeError("access_token", access_token, OAuth2Token)
with self.lock:
log.debug("%s auth token for %s", "Refreshing" if self.access_token else "Setting", self.client_id)
self.access_token = access_token
def _get_hash_values(self):
# 'access_token' may be refreshed once in a while. This should not affect the hash signature.
# 'identity' is just informational and should also not affect the hash signature.
return (getattr(self, k) for k in self.__dict__ if k not in ("_lock", "identity", "access_token"))
def sig(self):
# Like hash(self), but pulls in the access token. Protocol.refresh_credentials() uses this to find out
# if the access_token needs to be refreshed.
res = []
for k in self.__dict__:
if k in ("_lock", "identity"):
continue
if k == "access_token":
res.append(self.access_token["access_token"] if self.access_token else None)
continue
res.append(getattr(self, k))
return hash(tuple(res))
def __repr__(self):
return self.__class__.__name__ + repr((self.client_id, "********"))
def __str__(self):
return self.client_id
class OAuth2AuthorizationCodeCredentials(OAuth2Credentials):
"""Login info for OAuth 2.0 authentication using the authorization code grant type. This can be used in one of
several ways:
* Given an authorization code, client ID, and client secret, fetch a token ourselves and refresh it as needed if
supplied with a refresh token.
* Given an existing access token, refresh token, client ID, and client secret, use the access token until it
expires and then refresh it as needed.
* Given only an existing access token, use it until it expires. This can be used to let the calling application
refresh tokens itself by subclassing and implementing refresh().
Unlike the base (client credentials) grant, authorization code credentials don't require a Microsoft tenant ID
because each access token (and the authorization code used to get the access token) is restricted to a single
tenant.
"""
def __init__(self, authorization_code=None, access_token=None, **kwargs):
"""
:param client_id: ID of an authorized OAuth application, required for automatic token fetching and refreshing
:param client_secret: Secret associated with the OAuth application
:param tenant_id: Microsoft tenant ID of the account to access
:param identity: An Identity object representing the account that these credentials are connected to.
:param authorization_code: Code obtained when authorizing the application to access an account. In combination
with client_id and client_secret, will be used to obtain an access token.
:param access_token: Previously-obtained access token. If a token exists and the application will handle
refreshing by itself (or opts not to handle it), this parameter alone is sufficient.
"""
super().__init__(**kwargs)
self.authorization_code = authorization_code
if access_token is not None and not isinstance(access_token, dict):
raise InvalidTypeError("access_token", access_token, OAuth2Token)
self.access_token = access_token
def __repr__(self):
return self.__class__.__name__ + repr(
(self.client_id, "[client_secret]", "[authorization_code]", "[access_token]")
)
def __str__(self):
client_id = self.client_id
credential = (
"[access_token]"
if self.access_token is not None
else ("[authorization_code]" if self.authorization_code is not None else None)
)
description = " ".join(filter(None, [client_id, credential]))
return description or "[underspecified credentials]"
Classes
class BaseCredentials
-
Base for credential storage.
Establishes a method for refreshing credentials (mostly useful with OAuth, which expires tokens relatively frequently) and provides a lock for synchronizing access to the object around refreshes.
Expand source code
class BaseCredentials(metaclass=abc.ABCMeta): """Base for credential storage. Establishes a method for refreshing credentials (mostly useful with OAuth, which expires tokens relatively frequently) and provides a lock for synchronizing access to the object around refreshes. """ def __init__(self): self._lock = RLock() @property def lock(self): return self._lock @abc.abstractmethod def refresh(self, session): """Obtain a new set of valid credentials. This is mostly intended to support OAuth token refreshing, which can happen in long- running applications or those that cache access tokens and so might start with a token close to expiration. :param session: requests session asking for refreshed credentials :return: """ def _get_hash_values(self): return (getattr(self, k) for k in self.__dict__ if k != "_lock") def __eq__(self, other): return all(getattr(self, k) == getattr(other, k) for k in self.__dict__ if k != "_lock") def __hash__(self): return hash(tuple(self._get_hash_values())) def __getstate__(self): # The lock cannot be pickled state = self.__dict__.copy() del state["_lock"] return state def __setstate__(self, state): # Restore the lock self.__dict__.update(state) self._lock = RLock()
Subclasses
Instance variables
var lock
-
Expand source code
@property def lock(self): return self._lock
Methods
def refresh(self, session)
-
Obtain a new set of valid credentials. This is mostly intended to support OAuth token refreshing, which can happen in long- running applications or those that cache access tokens and so might start with a token close to expiration.
:param session: requests session asking for refreshed credentials :return:
Expand source code
@abc.abstractmethod def refresh(self, session): """Obtain a new set of valid credentials. This is mostly intended to support OAuth token refreshing, which can happen in long- running applications or those that cache access tokens and so might start with a token close to expiration. :param session: requests session asking for refreshed credentials :return: """
class Credentials (username, password)
-
Keeps login info the way Exchange likes it.
Usernames for authentication are of one of these forms: * PrimarySMTPAddress * WINDOMAIN\username * User Principal Name (UPN) password: Clear-text password
Expand source code
class Credentials(BaseCredentials): r"""Keeps login info the way Exchange likes it. Usernames for authentication are of one of these forms: * PrimarySMTPAddress * WINDOMAIN\username * User Principal Name (UPN) password: Clear-text password """ EMAIL = "email" DOMAIN = "domain" UPN = "upn" def __init__(self, username, password): super().__init__() if username.count("@") == 1: self.type = self.EMAIL elif username.count("\\") == 1: self.type = self.DOMAIN else: self.type = self.UPN self.username = username self.password = password def refresh(self, session): pass def __repr__(self): return self.__class__.__name__ + repr((self.username, "********")) def __str__(self): return self.username
Ancestors
Class variables
var DOMAIN
var EMAIL
var UPN
Inherited members
class OAuth2AuthorizationCodeCredentials (authorization_code=None, access_token=None, **kwargs)
-
Login info for OAuth 2.0 authentication using the authorization code grant type. This can be used in one of several ways: * Given an authorization code, client ID, and client secret, fetch a token ourselves and refresh it as needed if supplied with a refresh token. * Given an existing access token, refresh token, client ID, and client secret, use the access token until it expires and then refresh it as needed. * Given only an existing access token, use it until it expires. This can be used to let the calling application refresh tokens itself by subclassing and implementing refresh().
Unlike the base (client credentials) grant, authorization code credentials don't require a Microsoft tenant ID because each access token (and the authorization code used to get the access token) is restricted to a single tenant.
:param client_id: ID of an authorized OAuth application, required for automatic token fetching and refreshing :param client_secret: Secret associated with the OAuth application :param tenant_id: Microsoft tenant ID of the account to access :param identity: An Identity object representing the account that these credentials are connected to. :param authorization_code: Code obtained when authorizing the application to access an account. In combination with client_id and client_secret, will be used to obtain an access token. :param access_token: Previously-obtained access token. If a token exists and the application will handle refreshing by itself (or opts not to handle it), this parameter alone is sufficient.
Expand source code
class OAuth2AuthorizationCodeCredentials(OAuth2Credentials): """Login info for OAuth 2.0 authentication using the authorization code grant type. This can be used in one of several ways: * Given an authorization code, client ID, and client secret, fetch a token ourselves and refresh it as needed if supplied with a refresh token. * Given an existing access token, refresh token, client ID, and client secret, use the access token until it expires and then refresh it as needed. * Given only an existing access token, use it until it expires. This can be used to let the calling application refresh tokens itself by subclassing and implementing refresh(). Unlike the base (client credentials) grant, authorization code credentials don't require a Microsoft tenant ID because each access token (and the authorization code used to get the access token) is restricted to a single tenant. """ def __init__(self, authorization_code=None, access_token=None, **kwargs): """ :param client_id: ID of an authorized OAuth application, required for automatic token fetching and refreshing :param client_secret: Secret associated with the OAuth application :param tenant_id: Microsoft tenant ID of the account to access :param identity: An Identity object representing the account that these credentials are connected to. :param authorization_code: Code obtained when authorizing the application to access an account. In combination with client_id and client_secret, will be used to obtain an access token. :param access_token: Previously-obtained access token. If a token exists and the application will handle refreshing by itself (or opts not to handle it), this parameter alone is sufficient. """ super().__init__(**kwargs) self.authorization_code = authorization_code if access_token is not None and not isinstance(access_token, dict): raise InvalidTypeError("access_token", access_token, OAuth2Token) self.access_token = access_token def __repr__(self): return self.__class__.__name__ + repr( (self.client_id, "[client_secret]", "[authorization_code]", "[access_token]") ) def __str__(self): client_id = self.client_id credential = ( "[access_token]" if self.access_token is not None else ("[authorization_code]" if self.authorization_code is not None else None) ) description = " ".join(filter(None, [client_id, credential])) return description or "[underspecified credentials]"
Ancestors
Inherited members
class OAuth2Credentials (client_id, client_secret, tenant_id=None, identity=None)
-
Login info for OAuth 2.0 client credentials authentication, as well as a base for other OAuth 2.0 grant types.
This is primarily useful for in-house applications accessing data from a single Microsoft account. For applications that will access multiple tenants' data, the client credentials flow does not give the application enough information to restrict end users' access to the appropriate account. Use OAuth2AuthorizationCodeCredentials and the associated auth code grant type for multi-tenant applications.
:param client_id: ID of an authorized OAuth application, required for automatic token fetching and refreshing :param client_secret: Secret associated with the OAuth application :param tenant_id: Microsoft tenant ID of the account to access :param identity: An Identity object representing the account that these credentials are connected to.
Expand source code
class OAuth2Credentials(BaseCredentials): """Login info for OAuth 2.0 client credentials authentication, as well as a base for other OAuth 2.0 grant types. This is primarily useful for in-house applications accessing data from a single Microsoft account. For applications that will access multiple tenants' data, the client credentials flow does not give the application enough information to restrict end users' access to the appropriate account. Use OAuth2AuthorizationCodeCredentials and the associated auth code grant type for multi-tenant applications. """ def __init__(self, client_id, client_secret, tenant_id=None, identity=None): """ :param client_id: ID of an authorized OAuth application, required for automatic token fetching and refreshing :param client_secret: Secret associated with the OAuth application :param tenant_id: Microsoft tenant ID of the account to access :param identity: An Identity object representing the account that these credentials are connected to. """ super().__init__() self.client_id = client_id self.client_secret = client_secret self.tenant_id = tenant_id self.identity = identity # When set, access_token is a dict (or an oauthlib.oauth2.OAuth2Token, which is also a dict) self.access_token = None def refresh(self, session): # Creating a new session gets a new access token, so there's no work here to refresh the credentials. This # implementation just makes sure we don't raise a NotImplementedError. pass def on_token_auto_refreshed(self, access_token): """Set the access_token. Called after the access token is refreshed (requests-oauthlib can automatically refresh tokens if given an OAuth client ID and secret, so this is how our copy of the token stays up-to-date). Applications that cache access tokens can override this to store the new token - just remember to call the super() method. :param access_token: New token obtained by refreshing """ # Ensure we don't update the object in the middle of a new session being created, which could cause a race. if not isinstance(access_token, dict): raise InvalidTypeError("access_token", access_token, OAuth2Token) with self.lock: log.debug("%s auth token for %s", "Refreshing" if self.access_token else "Setting", self.client_id) self.access_token = access_token def _get_hash_values(self): # 'access_token' may be refreshed once in a while. This should not affect the hash signature. # 'identity' is just informational and should also not affect the hash signature. return (getattr(self, k) for k in self.__dict__ if k not in ("_lock", "identity", "access_token")) def sig(self): # Like hash(self), but pulls in the access token. Protocol.refresh_credentials() uses this to find out # if the access_token needs to be refreshed. res = [] for k in self.__dict__: if k in ("_lock", "identity"): continue if k == "access_token": res.append(self.access_token["access_token"] if self.access_token else None) continue res.append(getattr(self, k)) return hash(tuple(res)) def __repr__(self): return self.__class__.__name__ + repr((self.client_id, "********")) def __str__(self): return self.client_id
Ancestors
Subclasses
Methods
def on_token_auto_refreshed(self, access_token)
-
Set the access_token. Called after the access token is refreshed (requests-oauthlib can automatically refresh tokens if given an OAuth client ID and secret, so this is how our copy of the token stays up-to-date). Applications that cache access tokens can override this to store the new token - just remember to call the super() method.
:param access_token: New token obtained by refreshing
Expand source code
def on_token_auto_refreshed(self, access_token): """Set the access_token. Called after the access token is refreshed (requests-oauthlib can automatically refresh tokens if given an OAuth client ID and secret, so this is how our copy of the token stays up-to-date). Applications that cache access tokens can override this to store the new token - just remember to call the super() method. :param access_token: New token obtained by refreshing """ # Ensure we don't update the object in the middle of a new session being created, which could cause a race. if not isinstance(access_token, dict): raise InvalidTypeError("access_token", access_token, OAuth2Token) with self.lock: log.debug("%s auth token for %s", "Refreshing" if self.access_token else "Setting", self.client_id) self.access_token = access_token
def sig(self)
-
Expand source code
def sig(self): # Like hash(self), but pulls in the access token. Protocol.refresh_credentials() uses this to find out # if the access_token needs to be refreshed. res = [] for k in self.__dict__: if k in ("_lock", "identity"): continue if k == "access_token": res.append(self.access_token["access_token"] if self.access_token else None) continue res.append(getattr(self, k)) return hash(tuple(res))
Inherited members