289 lines
11 KiB
Python
289 lines
11 KiB
Python
import contextlib
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import grp
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import pwd
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from typing import Union, Dict, List
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from flask import g
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import gssapi
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import ldap3
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from zope import component
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from zope.interface import implementer
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from ceo_common.errors import UserNotFoundError, GroupNotFoundError, \
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UserAlreadyExistsError, GroupAlreadyExistsError
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from ceo_common.interfaces import ILDAPService, IConfig, \
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IUser, IGroup, IUWLDAPService
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from .User import User
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from .Group import Group
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@implementer(ILDAPService)
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class LDAPService:
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def __init__(self):
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cfg = component.getUtility(IConfig)
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self.ldap_server_url = cfg.get('ldap_server_url')
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self.ldap_sasl_realm = cfg.get('ldap_sasl_realm')
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self.ldap_users_base = cfg.get('ldap_users_base')
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self.ldap_groups_base = cfg.get('ldap_groups_base')
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self.ldap_sudo_base = cfg.get('ldap_sudo_base')
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self.member_min_id = cfg.get('members_min_id')
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self.member_max_id = cfg.get('members_max_id')
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self.club_min_id = cfg.get('clubs_min_id')
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self.club_max_id = cfg.get('clubs_max_id')
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def _get_ldap_conn(self) -> ldap3.Connection:
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if 'ldap_conn' in g:
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return g.ldap_conn
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kwargs = {'auto_bind': True, 'raise_exceptions': True}
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if 'client_token' in g:
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kwargs['authentication'] = ldap3.SASL
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kwargs['sasl_mechanism'] = ldap3.KERBEROS
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creds = gssapi.Credentials(token=g.client_token)
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# see https://github.com/cannatag/ldap3/blob/master/ldap3/protocol/sasl/kerberos.py
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kwargs['sasl_credentials'] = (None, None, creds)
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conn = ldap3.Connection(self.ldap_server_url, **kwargs)
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# cache the connection for a single request
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g.ldap_conn = conn
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return conn
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def _get_readable_entry_for_user(self, conn: ldap3.Connection, username: str) -> ldap3.Entry:
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base = self.uid_to_dn(username)
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try:
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conn.search(
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base, '(objectClass=*)', search_scope=ldap3.BASE,
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attributes=ldap3.ALL_ATTRIBUTES)
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except ldap3.core.exceptions.LDAPNoSuchObjectResult:
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raise UserNotFoundError(username)
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return conn.entries[0]
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def _get_readable_entry_for_group(self, conn: ldap3.Connection, cn: str) -> ldap3.Entry:
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base = self.group_cn_to_dn(cn)
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try:
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conn.search(
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base, '(objectClass=*)', search_scope=ldap3.BASE,
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attributes=ldap3.ALL_ATTRIBUTES)
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except ldap3.core.exceptions.LDAPNoSuchObjectResult:
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raise GroupNotFoundError(cn)
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return conn.entries[0]
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def _get_writable_entry_for_user(self, user: IUser) -> ldap3.WritableEntry:
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if user.ldap3_entry is None:
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conn = self._get_ldap_conn()
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user.ldap3_entry = self._get_readable_entry_for_user(conn, user.uid)
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return user.ldap3_entry.entry_writable()
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def _get_writable_entry_for_group(self, group: IGroup) -> ldap3.WritableEntry:
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if group.ldap3_entry is None:
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conn = self._get_ldap_conn()
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group.ldap3_entry = self._get_readable_entry_for_group(conn, group.cn)
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return group.ldap3_entry.entry_writable()
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def get_user(self, username: str) -> IUser:
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conn = self._get_ldap_conn()
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entry = self._get_readable_entry_for_user(conn, username)
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return User.deserialize_from_ldap(entry)
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def get_group(self, cn: str) -> IGroup:
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conn = self._get_ldap_conn()
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entry = self._get_readable_entry_for_group(conn, cn)
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return Group.deserialize_from_ldap(entry)
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def get_display_info_for_users(self, usernames: List[str]) -> List[Dict[str, str]]:
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if not usernames:
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return []
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conn = self._get_ldap_conn()
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filter = '(|' + ''.join([f'(uid={uid})' for uid in usernames]) + ')'
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attributes = ['uid', 'cn', 'program']
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conn.search(self.ldap_users_base, filter, attributes=attributes)
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return [
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{
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'uid': entry.uid.value,
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'cn': entry.cn.value,
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'program': entry.program.value or 'Unknown',
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}
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for entry in conn.entries
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]
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def get_users_with_positions(self) -> List[IUser]:
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conn = self._get_ldap_conn()
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conn.search(self.ldap_users_base, '(position=*)', attributes=ldap3.ALL_ATTRIBUTES)
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return [User.deserialize_from_ldap(entry) for entry in conn.entries]
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def uid_to_dn(self, uid: str):
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return f'uid={uid},{self.ldap_users_base}'
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def group_cn_to_dn(self, cn: str):
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return f'cn={cn},{self.ldap_groups_base}'
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def _get_next_uid(self, conn: ldap3.Connection, min_id: int, max_id: int) -> int:
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"""Gets the next available UID number between min_id and max_id, inclusive."""
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def uid_exists(uid: int) -> bool:
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try:
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pwd.getpwuid(uid)
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return True
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except KeyError:
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return False
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def gid_exists(gid: int) -> bool:
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try:
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grp.getgrgid(gid)
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return True
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except KeyError:
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return False
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def ldap_uid_or_gid_exists(uid: int) -> bool:
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return conn.search(
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self.ldap_users_base,
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f'(|(uidNumber={uid})(gidNumber={uid}))',
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size_limit=1)
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# TODO: replace this with binary search
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for uid in range(min_id, max_id + 1):
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if uid_exists(uid) or gid_exists(uid) or ldap_uid_or_gid_exists(uid):
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continue
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return uid
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raise Exception('no UIDs remaining')
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def add_sudo_role(self, uid: str):
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conn = self._get_ldap_conn()
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obj_def = ldap3.ObjectDef(['sudoRole'], conn)
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writer = ldap3.Writer(conn, obj_def)
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dn = f'cn=%{uid},{self.ldap_sudo_base}'
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entry = writer.new(dn)
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entry.cn = '%' + uid
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entry.sudoUser = '%' + uid
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entry.sudoHost = 'ALL'
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entry.sudoCommand = 'ALL'
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entry.sudoOption = ['!authenticate']
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entry.sudoRunAsUser = uid
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writer.commit()
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def remove_sudo_role(self, uid: str):
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conn = self._get_ldap_conn()
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dn = f'cn=%{uid},{self.ldap_sudo_base}'
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conn.delete(dn)
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def add_user(self, user: IUser):
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object_classes = ['account', 'posixAccount', 'shadowAccount']
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if user.is_club():
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min_id, max_id = self.club_min_id, self.club_max_id
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object_classes.append('club')
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else:
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min_id, max_id = self.member_min_id, self.member_max_id
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object_classes.append('member')
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if user.mail_local_addresses:
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object_classes.append('inetLocalMailRecipient')
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conn = self._get_ldap_conn()
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obj_def = ldap3.ObjectDef(object_classes, conn)
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uid_number = self._get_next_uid(conn, min_id, max_id)
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user.uid_number = uid_number
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user.gid_number = uid_number
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writer = ldap3.Writer(conn, obj_def)
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entry = writer.new(self.uid_to_dn(user.uid))
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entry.cn = user.cn
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entry.uidNumber = user.uid_number
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entry.gidNumber = user.gid_number
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entry.homeDirectory = user.home_directory
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if user.login_shell:
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entry.loginShell = user.login_shell
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if user.program:
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entry.program = user.program
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if user.terms:
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entry.term = user.terms
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if user.non_member_terms:
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entry.nonMemberTerm = user.non_member_terms
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if user.positions:
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entry.position = user.positions
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if user.mail_local_addresses:
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entry.mailLocalAddress = user.mail_local_addresses
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if user.is_club_rep:
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entry.isClubRep = True
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if not user.is_club():
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entry.userPassword = '{SASL}%s@%s' % (user.uid, self.ldap_sasl_realm)
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try:
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writer.commit()
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except ldap3.core.exceptions.LDAPEntryAlreadyExistsResult:
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raise UserAlreadyExistsError()
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@contextlib.contextmanager
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def entry_ctx_for_user(self, user: IUser):
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entry = self._get_writable_entry_for_user(user)
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yield entry
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entry.entry_commit_changes()
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def remove_user(self, user: IUser):
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conn = self._get_ldap_conn()
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conn.delete(self.uid_to_dn(user.uid))
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def add_group(self, group: IGroup) -> IGroup:
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conn = self._get_ldap_conn()
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# make sure that the caller initialized the GID number
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assert group.gid_number
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obj_def = ldap3.ObjectDef(['group', 'posixGroup'], conn)
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writer = ldap3.Writer(conn, obj_def)
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entry = writer.new(self.group_cn_to_dn(group.cn))
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entry.cn = group.cn
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entry.gidNumber = group.gid_number
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if group.members:
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entry.uniqueMember = [self.uid_to_dn(uid) for uid in group.members]
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if group.description:
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entry.description = group.description
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try:
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writer.commit()
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except ldap3.core.exceptions.LDAPEntryAlreadyExistsResult:
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raise GroupAlreadyExistsError()
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@contextlib.contextmanager
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def entry_ctx_for_group(self, group: IGroup):
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entry = self._get_writable_entry_for_group(group)
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yield entry
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entry.entry_commit_changes()
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def remove_group(self, group: IGroup):
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conn = self._get_ldap_conn()
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conn.delete(self.group_cn_to_dn(group.cn))
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def update_programs(
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self,
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dry_run: bool = False,
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members: Union[List[str], None] = None,
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uwldap_batch_size: int = 10,
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):
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if members:
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filter = '(|' + ''.join([f'(uid={uid})' for uid in members]) + ')'
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else:
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filter = '(objectClass=*)'
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conn = self._get_ldap_conn()
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conn.search(
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self.ldap_users_base, filter, attributes=['uid', 'program'])
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uids = [entry.uid.value for entry in conn.entries]
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csc_programs = [entry.program.value for entry in conn.entries]
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uwldap_srv = component.getUtility(IUWLDAPService)
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uw_programs = []
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# send queries in small batches so that we don't have an
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# enormous filter in our query to UWLDAP
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for i in range(0, len(csc_programs), uwldap_batch_size):
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batch_uids = uids[i:i + uwldap_batch_size]
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batch_uw_programs = uwldap_srv.get_programs_for_users(batch_uids)
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uw_programs.extend(batch_uw_programs)
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users_to_change = [
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(uids[i], csc_programs[i], uw_programs[i])
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for i in range(len(uids))
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if csc_programs[i] != uw_programs[i] and (
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uw_programs[i] not in (None, 'expired', 'orphaned')
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)
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]
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if dry_run:
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return users_to_change
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for uid, old_program, new_program in users_to_change:
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changes = {'program': [(ldap3.MODIFY_REPLACE, [new_program])]}
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conn.modify(self.uid_to_dn(uid), changes)
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return users_to_change
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