14.2.2. UserIdResolvers¶

The useridresolver is responsible for getting userids for loginnames and vice versa.

This base module contains the base class UserIdResolver.UserIdResolver and also the community class PasswdIdResolver.IdResolver, that is inherited from the base class.

14.2.2.1. Base class¶

class edumfa.lib.resolvers.UserIdResolver.UserIdResolver[source]¶

add_user(attributes=None)[source]¶

Add a new user in the useridresolver. This is only possible, if the UserIdResolver supports this and if we have write access to the user store.

Parameters:

username (basestring) – The login name of the user
attributes – Attributes according to the attribute mapping

Returns:

The new UID of the user. The UserIdResolver needs to

determine the way how to create the UID.

checkPass(uid, password)[source]¶

This function checks the password for a given uid. returns true in case of success false if password does not match

Parameters:

uid (string or int) – The uid in the resolver
password (string) – the password to check. Usually in cleartext

Returns:

True or False

Return type:

bool

close()[source]¶: Hook to close down the resolver after one request

delete_user(uid)[source]¶: Delete a user from the useridresolver. The user is referenced by the user id. :param uid: The uid of the user object, that should be deleted. :type uid: basestring :return: Returns True in case of success :rtype: bool

property editable¶: Return true, if the Instance! of this resolver is configured editable. :return:

classmethod getResolverClassDescriptor()[source]¶

return the descriptor of the resolver, which is - the class name and - the config description

Returns:: resolver description dict
Return type:: dict

static getResolverClassType()[source]¶: provide the resolver type for registration

static getResolverDescriptor()[source]¶

return the descriptor of the resolver, which is - the class name and - the config description

Returns:: resolver description dict
Return type:: dict

getResolverId()[source]¶: get resolver specific information :return: the resolver identifier string - empty string if not exist

static getResolverType()[source]¶

getResolverType - return the type of the resolver

Returns:: returns the string ‘ldapresolver’
Return type:: string

getUserId(loginName)[source]¶

The loginname is resolved to a user_id. Depending on the resolver type the user_id can be an ID (like in /etc/passwd) or a string (like the DN in LDAP)

It needs to return an empty string, if the user does not exist.

Parameters:: loginName (sting) – The login name of the user
Returns:: The ID of the user
Return type:: str

getUserInfo(userid)[source]¶: This function returns all user information for a given user object identified by UserID. :param userid: ID of the user in the resolver :type userid: int or string :return: dictionary, if no object is found, the dictionary is empty :rtype: dict

getUserList(searchDict=None)[source]¶

This function finds the user objects, that have the term ‘value’ in the user object field ‘key’

Parameters:: searchDict (dict) – dict with key values of user attributes - the key may be something like ‘loginname’ or ‘email’ the value is a regular expression.
Returns:: list of dictionaries (each dictionary contains a user object) or an empty string if no object is found.
Return type:: list of dicts

getUsername(userid)[source]¶: Returns the username/loginname for a given userid :param userid: The userid in this resolver :type userid: string :return: username :rtype: string

property has_multiple_loginnames¶: Return if this resolver has multiple loginname attributes :return: bool

loadConfig(config)[source]¶

Load the configuration from the dict into the Resolver object. If attributes are missing, need to set default values. If required attributes are missing, this should raise an Exception.

Parameters:: config (dict) – The configuration values of the resolver

classmethod testconnection(param)[source]¶

This function lets you test if the parameters can be used to create a working resolver. The implementation should try to connect to the user store and verify if users can be retrieved. In case of success it should return a text like “Resolver config seems OK. 123 Users found.”

Parameters:: param (dict) – The parameters that should be saved as the resolver
Returns:: returns True in case of success and a descriptive text
Return type:: tuple

update_user(uid, attributes=None)[source]¶

Update an existing user. This function is also used to update the password. Since the attribute mapping know, which field contains the password, this function can also take care for password changing.

Attributes that are not contained in the dict attributes are not modified.

Parameters:

uid (basestring) – The uid of the user object in the resolver.
attributes (dict) – Attributes to be updated.

Returns:

True in case of success

14.2.2.2. PasswdResolver¶

class edumfa.lib.resolvers.PasswdIdResolver.IdResolver[source]¶

simple constructor

checkPass(uid, password)[source]¶

This function checks the password for a given uid. returns true in case of success false if password does not match

We do not support shadow passwords. so the seconds column of the passwd file needs to contain the encrypted password

If the password is a unicode object, it is encoded according to ENCODING first.

Parameters:

uid (int) – The uid of the user
password (sting) – The password in cleartext

Returns:

True or False

Return type:

bool

checkUserId(line, pattern)[source]¶

Check if a userid matches a pattern. A pattern can be “=1000”, “>=1000”, “<2000” or “between 1000,2000”.

Parameters:

line (dict) – the dictionary of a user
pattern (string) – match pattern with <, <=…

Returns:

True or False

Return type:

bool

checkUserName(line, pattern)[source]¶: check for user name

classmethod getResolverClassDescriptor()[source]¶

return the descriptor of the resolver, which is - the class name and - the config description

Returns:: resolver description dict
Return type:: dict

static getResolverClassType()[source]¶: provide the resolver type for registration

static getResolverDescriptor()[source]¶

return the descriptor of the resolver, which is - the class name and - the config description

Returns:: resolver description dict
Return type:: dict

getResolverId()[source]¶: return the resolver identifier string, which in fact is filename, where it points to.

static getResolverType()[source]¶

getResolverType - return the type of the resolver

Returns:: returns the string ‘ldapresolver’
Return type:: string

getSearchFields(searchDict=None)[source]¶

show, which search fields this userIdResolver supports

TODO: implementation is not completed

Parameters:: searchDict (dict) – fields, which can be queried
Returns:: dict of all searchFields
Return type:: dict

getUserId(LoginName)[source]¶

search the user id from the login name

Parameters:: LoginName – the login of the user (as unicode)
Returns:: the userId
Return type:: str

getUserInfo(userId, no_passwd=False)[source]¶

get some info about the user as we only have the loginId, we have to traverse the dict for the value

Parameters:

userId – the to be searched user
no_passwd – return no password

Returns:

dict of user info

getUserList(searchDict=None)[source]¶

get a list of all users matching the search criteria of the searchdict

Parameters:: searchDict – dict of search expressions

getUsername(userId)[source]¶: Returns the username/loginname for a given userid :param userid: The userid in this resolver :type userid: string :return: username :rtype: str

loadConfig(configDict)[source]¶: The UserIdResolver could be configured from the pylons app config - here this could be the passwd file , whether it is /etc/passwd or /etc/shadow

loadFile()[source]¶: Loads the data of the file initially. if the self.fileName is empty, it loads /etc/passwd. Empty lines are ignored.

static setup(config=None, cache_dir=None)[source]¶

this setup hook is triggered, when the server starts to serve the first request

Parameters:: config (the eduMFA config dict) – the eduMFA config

14.2.2.3. LDAPResolver¶

class edumfa.lib.resolvers.LDAPIdResolver.IdResolver[source]¶

add_user(attributes=None)[source]¶

Add a new user to the LDAP directory. The user can only be created in the LDAP using a DN. So we have to construct the DN out of the given attributes.

attributes are these “username”, “surname”, “givenname”, “email”, “mobile”, “phone”, “password”

Parameters:: attributes (dict) – Attributes according to the attribute mapping
Returns:: The new UID of the user. The UserIdResolver needs to

determine the way how to create the UID.

checkPass(uid, password)[source]¶: This function checks the password for a given uid. - returns true in case of success - false if password does not match

static create_connection(authtype=None, server=None, user=None, password=None, auto_bind='NONE', client_strategy='RESTARTABLE', check_names=True, auto_referrals=False, receive_timeout=5, start_tls=False, keytabfile=None)[source]¶

Create a connection to the LDAP server.

Parameters:

authtype
server
user
password
auto_bind
client_strategy
check_names
auto_referrals
receive_timeout (float) – At the moment we do not use this, since receive_timeout is not supported by ldap3 < 2
start_tls (bool) – Use startTLS for connection to server
keytabfile (str) – Path to keytab file for service account

Returns:

classmethod create_serverpool(urilist, timeout, get_info=None, tls_context=None, rounds=2, exhaust=30, pool_cls=<class 'ldap3.core.pooling.ServerPool'>, strategy='ROUND_ROBIN')[source]¶

This creates the serverpool for the ldap3 connection. The URI from the LDAP resolver can contain a comma separated list of LDAP servers. These are split and then added to the pool.

See https://github.com/cannatag/ldap3/blob/master/docs/manual/source/servers.rst#server-pool

Parameters:

urilist (basestring) – The list of LDAP URIs, comma separated
timeout (float) – The connection timeout
get_info – The get_info type passed to the ldap3.Sever constructor. default: ldap3.SCHEMA, should be ldap3.NONE in case of a bind.
tls_context – A ldap3.tls object, which defines if certificate verification should be performed
rounds – The number of rounds we should cycle through the server pool before giving up
exhaust – The seconds, for how long a non-reachable server should be removed from the serverpool
pool_cls – ldap3.ServerPool subclass that should be instantiated
strategy (str) – The pooling strategy of the server-pool

Returns:

Server Pool

Return type:

ldap3.ServerPool

delete_user(uid)[source]¶

Delete a user from the LDAP Directory.

The user is referenced by the user id. :param uid: The uid of the user object, that should be deleted. :type uid: basestring :return: Returns True in case of success :rtype: bool

property editable¶: Return true, if the instance of the resolver is configured editable :return:

classmethod getResolverClassDescriptor()[source]¶

return the descriptor of the resolver, which is - the class name and - the config description

Returns:: resolver description dict
Return type:: dict

static getResolverClassType()[source]¶: provide the resolver type for registration

static getResolverDescriptor()[source]¶

return the descriptor of the resolver, which is - the class name and - the config description

Returns:: resolver description dict
Return type:: dict

getResolverId()[source]¶

Returns the resolver Id This should be an Identifier of the resolver, preferable the type and the name of the resolver.

Returns:: the id of the resolver
Return type:: str

static getResolverType()[source]¶

getResolverType - return the type of the resolver

Returns:: returns the string ‘ldapresolver’
Return type:: string

getUserId(LoginName)[source]¶

resolve the loginname to the userid.

Parameters:: LoginName (str) – The login name from the credentials
Returns:: UserId as found for the LoginName
Return type:: str

getUserInfo(userId)[source]¶

This function returns all user info for a given userid/object.

Parameters:: userId (string) – The userid of the object
Returns:: A dictionary with the keys defined in self.userinfo
Return type:: dict

getUserList(searchDict=None)[source]¶

Parameters:: searchDict (dict) – A dictionary with search parameters
Returns:: list of users, where each user is a dictionary

getUsername(user_id)[source]¶

Returns the username/loginname for a given user_id

Parameters:: user_id (string) – The user_id in this resolver
Returns:: username
Return type:: string

get_persistent_serverpool(get_info=None)[source]¶

Return a process-level instance of LockingServerPool for the current LDAP resolver configuration. Retrieve it from the app-local store. If such an instance does not exist yet, create one.

Parameters:: get_info – one of ldap3.SCHEMA, ldap3.NONE, ldap3.ALL
Returns:: a LockingServerPool instance

get_serverpool_instance(get_info=None)[source]¶

Return a ServerPool instance that should be used. If SERVERPOOL_PERSISTENT is enabled, invoke get_persistent_serverpool to retrieve a per-process server pool instance. If it is not enabled, invoke create_serverpool to retrieve a per-request server pool instance.

Parameters:: get_info – one of ldap3.SCHEMA, ldap3.NONE, ldap3.ALL
Returns:: a ServerPool/LockingServerPool instance

property has_multiple_loginnames¶: Return if this resolver has multiple loginname attributes :return: bool

loadConfig(config)[source]¶

Load the config from conf.

Parameters:: config (dict) – The configuration from the Config Table

‘#ldap_uri’: ‘LDAPURI’, ‘#ldap_basedn’: ‘LDAPBASE’, ‘#ldap_binddn’: ‘BINDDN’, ‘#ldap_password’: ‘BINDPW’, ‘#ldap_timeout’: ‘TIMEOUT’, ‘#ldap_sizelimit’: ‘SIZELIMIT’, ‘#ldap_loginattr’: ‘LOGINNAMEATTRIBUTE’, ‘#ldap_searchfilter’: ‘LDAPSEARCHFILTER’, ‘#ldap_mapping’: ‘USERINFO’, ‘#ldap_uidtype’: ‘UIDTYPE’, ‘#ldap_noreferrals’ : ‘NOREFERRALS’, ‘#ldap_editable’ : ‘EDITABLE’, ‘#ldap_certificate’: ‘CACERTIFICATE’, ‘#ldap_keytabfile’: ‘KEYTABFILE’,

static split_uri(uri)[source]¶: Splits LDAP URIs like: * ldap://server * ldaps://server * ldap[s]://server:1234 * server :param uri: The LDAP URI :return: Returns a tuple of Servername, Port and SSL(bool)

classmethod testconnection(param)[source]¶

This function lets you test the to be saved LDAP connection.

Parameters are:: BINDDN, BINDPW, LDAPURI, TIMEOUT, LDAPBASE, LOGINNAMEATTRIBUTE, LDAPSEARCHFILTER, USERINFO, SIZELIMIT, NOREFERRALS, CACERTIFICATE, AUTHTYPE, TLS_VERIFY, TLS_VERSION, TLS_CA_FILE, SERVERPOOL_ROUNDS, SERVERPOOL_SKIP, SERVERPOOL_STRATEGY

Parameters:: param (dict) – A dictionary with all necessary parameter to test the connection.
Returns:: Tuple of success and a description
Return type:: (bool, string)

update_user(uid, attributes=None)[source]¶

Attributes that are not contained in the dict attributes are not modified.

Parameters:

uid (basestring) – The uid of the user object in the resolver.
attributes (dict) – Attributes to be updated.

Returns:

True in case of success