521 lines
14 KiB
Python
521 lines
14 KiB
Python
"""
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CSC Member Management
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This module contains functions for registering new members, registering
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members for terms, searching for members, and other member-related
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functions.
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Transactions are used in each method that modifies the database.
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Future changes to the members database that need to be atomic
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must also be moved into this module.
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"""
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import os, re, subprocess, ldap
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from ceo import conf, ldapi, terms
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from ceo.excep import InvalidArgument
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### Configuration ###
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CONFIG_FILE = '/etc/csc/accounts.cf'
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cfg = {}
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def configure():
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"""Load Members Configuration"""
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string_fields = [ 'username_regex', 'shells_file', 'server_url',
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'users_base', 'groups_base', 'sasl_mech', 'sasl_realm',
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'admin_bind_keytab', 'admin_bind_userid', 'realm',
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'admin_principal', 'admin_keytab', 'expired_account_email' ]
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numeric_fields = [ 'min_password_length' ]
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# read configuration file
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cfg_tmp = conf.read(CONFIG_FILE)
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# verify configuration
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conf.check_string_fields(CONFIG_FILE, string_fields, cfg_tmp)
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conf.check_integer_fields(CONFIG_FILE, numeric_fields, cfg_tmp)
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# update the current configuration with the loaded values
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cfg.update(cfg_tmp)
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### Exceptions ###
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class MemberException(Exception):
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"""Base exception class for member-related errors."""
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def __init__(self, ex=None):
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Exception.__init__(self)
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self.ex = ex
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def __str__(self):
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return str(self.ex)
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class InvalidTerm(MemberException):
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"""Exception class for malformed terms."""
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def __init__(self, term):
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MemberException.__init__(self)
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self.term = term
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def __str__(self):
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return "Term is invalid: %s" % self.term
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class NoSuchMember(MemberException):
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"""Exception class for nonexistent members."""
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def __init__(self, memberid):
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MemberException.__init__(self)
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self.memberid = memberid
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def __str__(self):
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return "Member not found: %d" % self.memberid
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class ChildFailed(MemberException):
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def __init__(self, program, status, output):
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MemberException.__init__(self)
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self.program, self.status, self.output = program, status, output
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def __str__(self):
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msg = '%s failed with status %d' % (self.program, self.status)
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if self.output:
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msg += ': %s' % self.output
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return msg
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### Connection Management ###
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# global directory connection
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ld = None
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def connect(auth_callback):
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"""Connect to LDAP."""
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configure()
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global ld
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password = None
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tries = 0
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while ld is None:
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try:
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ld = ldapi.connect_sasl(cfg['server_url'], cfg['sasl_mech'],
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cfg['sasl_realm'], password)
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except ldap.LOCAL_ERROR, e:
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tries += 1
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if tries > 3:
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raise e
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password = auth_callback.callback(e)
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if password == None:
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raise e
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def disconnect():
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"""Disconnect from LDAP."""
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global ld
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ld.unbind_s()
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ld = None
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def connected():
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"""Determine whether the connection has been established."""
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return ld and ld.connected()
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### Members ###
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def create_member(username, password, name, program):
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"""
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Creates a UNIX user account with options tailored to CSC members.
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Parameters:
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username - the desired UNIX username
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password - the desired UNIX password
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name - the member's real name
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program - the member's program of study
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Exceptions:
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InvalidArgument - on bad account attributes provided
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Returns: the uid number of the new account
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See: create()
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"""
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# check username format
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if not username or not re.match(cfg['username_regex'], username):
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raise InvalidArgument("username", username, "expected format %s" % repr(cfg['username_regex']))
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# check password length
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if not password or len(password) < cfg['min_password_length']:
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raise InvalidArgument("password", "<hidden>", "too short (minimum %d characters)" % cfg['min_password_length'])
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try:
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args = [ "/usr/bin/addmember", "--stdin", username, name, program ]
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addmember = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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out, err = addmember.communicate(password)
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status = addmember.wait()
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except OSError, e:
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raise MemberException(e)
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if status:
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raise ChildFailed("addmember", status, out+err)
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def get(userid):
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"""
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Look up attributes of a member by userid.
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Returns: a dictionary of attributes
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Example: get('mspang') -> {
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'cn': [ 'Michael Spang' ],
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'program': [ 'Computer Science' ],
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...
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}
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"""
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return ldapi.lookup(ld, 'uid', userid, cfg['users_base'])
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def uid2dn(uid):
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return 'uid=%s,%s' % (ldapi.escape(uid), cfg['users_base'])
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def list_term(term):
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"""
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Build a list of members in a term.
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Parameters:
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term - the term to match members against
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Returns: a list of members
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Example: list_term('f2006'): -> {
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'uid=mspang, ou=...': { 'cn': 'Michael Spang', ... },
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'uid=ctdalek, ou=...': { 'cn': 'Calum T. Dalek', ... },
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...
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}
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"""
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members = ldapi.search(ld, cfg['users_base'],
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'(&(objectClass=member)(term=%s))', [ term ])
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return dict([(member[0], member[1]) for member in members])
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def list_name(name):
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"""
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Build a list of members with matching names.
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Parameters:
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name - the name to match members against
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Returns: a list of member dictionaries
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Example: list_name('Spang'): -> {
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'uid=mspang, ou=...': { 'cn': 'Michael Spang', ... },
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...
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]
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"""
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members = ldapi.search(ld, cfg['users_base'],
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'(&(objectClass=member)(cn~=%s))', [ name ])
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return dict([(member[0], member[1]) for member in members])
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def list_group(group):
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"""
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Build a list of members in a group.
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Parameters:
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group - the group to match members against
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Returns: a list of member dictionaries
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Example: list_name('syscom'): -> {
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'uid=mspang, ou=...': { 'cn': 'Michael Spang', ... },
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...
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]
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"""
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members = group_members(group)
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ret = {}
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if members:
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for member in members:
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info = get(member)
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if info:
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ret[uid2dn(member)] = info
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return ret
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def list_all():
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"""
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Build a list of all members
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Returns: a list of member dictionaries
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Example: list_name('Spang'): -> {
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'uid=mspang, ou=...': { 'cn': 'Michael Spang', ... },
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...
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]
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"""
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members = ldapi.search(ld, cfg['users_base'], '(objectClass=member)')
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return dict([(member[0], member[1]) for member in members])
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def list_positions():
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"""
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Build a list of positions
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Returns: a list of positions and who holds them
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Example: list_positions(): -> {
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'president': { 'mspang': { 'cn': 'Michael Spang', ... } } ],
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...
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]
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"""
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members = ld.search_s(cfg['users_base'], ldap.SCOPE_SUBTREE, '(position=*)')
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positions = {}
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for (_, member) in members:
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for position in member['position']:
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if not position in positions:
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positions[position] = {}
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positions[position][member['uid'][0]] = member
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return positions
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def set_position(position, members):
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"""
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Sets a position
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Parameters:
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position - the position to set
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members - an array of members that hold the position
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Example: set_position('president', ['dtbartle'])
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"""
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res = ld.search_s(cfg['users_base'], ldap.SCOPE_SUBTREE,
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'(&(objectClass=member)(position=%s))' % ldapi.escape(position))
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old = set([ member['uid'][0] for (_, member) in res ])
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new = set(members)
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mods = {
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'del': set(old) - set(new),
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'add': set(new) - set(old),
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}
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if len(mods['del']) == 0 and len(mods['add']) == 0:
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return
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for action in ['del', 'add']:
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for userid in mods[action]:
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dn = 'uid=%s,%s' % (ldapi.escape(userid), cfg['users_base'])
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entry1 = {'position' : [position]}
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entry2 = {} #{'position' : []}
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entry = ()
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if action == 'del':
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entry = (entry1, entry2)
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elif action == 'add':
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entry = (entry2, entry1)
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mlist = ldapi.make_modlist(entry[0], entry[1])
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ld.modify_s(dn, mlist)
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def change_group_member(action, group, userid):
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user_dn = 'uid=%s,%s' % (ldapi.escape(userid), cfg['users_base'])
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group_dn = 'cn=%s,%s' % (ldapi.escape(group), cfg['groups_base'])
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entry1 = {'uniqueMember' : []}
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entry2 = {'uniqueMember' : [user_dn]}
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entry = []
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if action == 'add' or action == 'insert':
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entry = (entry1, entry2)
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elif action == 'remove' or action == 'delete':
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entry = (entry2, entry1)
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else:
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raise InvalidArgument("action", action, "invalid action")
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mlist = ldapi.make_modlist(entry[0], entry[1])
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ld.modify_s(group_dn, mlist)
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### Shells ###
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def get_shell(userid):
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member = ldapi.lookup(ld, 'uid', userid, cfg['users_base'])
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if not member:
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raise NoSuchMember(userid)
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if 'loginShell' not in member:
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return
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return member['loginShell'][0]
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def get_shells():
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return [ sh for sh in open(cfg['shells_file']).read().split("\n")
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if sh
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and sh[0] == '/'
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and not '#' in sh
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and os.access(sh, os.X_OK) ]
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def set_shell(userid, shell):
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if not shell in get_shells():
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raise InvalidArgument("shell", shell, "is not in %s" % cfg['shells_file'])
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ldapi.modify(ld, 'uid', userid, cfg['users_base'], [ (ldap.MOD_REPLACE, 'loginShell', [ shell ]) ])
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### Clubs ###
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def create_club(username, name):
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"""
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Creates a UNIX user account with options tailored to CSC-hosted clubs.
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Parameters:
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username - the desired UNIX username
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name - the club name
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Exceptions:
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InvalidArgument - on bad account attributes provided
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Returns: the uid number of the new account
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See: create()
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"""
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# check username format
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if not username or not re.match(cfg['username_regex'], username):
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raise InvalidArgument("username", username, "expected format %s" % repr(cfg['username_regex']))
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try:
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args = [ "/usr/bin/addclub", username, name ]
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addclub = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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out, err = addclub.communicate()
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status = addclub.wait()
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except OSError, e:
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raise MemberException(e)
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if status:
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raise ChildFailed("addclub", status, out+err)
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### Terms ###
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def register(userid, term_list):
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"""
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Registers a member for one or more terms.
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Parameters:
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userid - the member's username
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term_list - the term to register for, or a list of terms
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Exceptions:
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InvalidTerm - if a term is malformed
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Example: register(3349, "w2007")
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Example: register(3349, ["w2007", "s2007"])
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"""
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user_dn = 'uid=%s,%s' % (ldapi.escape(userid), cfg['users_base'])
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if type(term_list) in (str, unicode):
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term_list = [ term_list ]
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ldap_member = get(userid)
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if ldap_member and 'term' not in ldap_member:
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ldap_member['term'] = []
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if not ldap_member:
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raise NoSuchMember(userid)
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new_member = ldap_member.copy()
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new_member['term'] = new_member['term'][:]
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for term in term_list:
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# check term syntax
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if not re.match('^[wsf][0-9]{4}$', term):
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raise InvalidTerm(term)
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# add the term to the entry
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if not term in ldap_member['term']:
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new_member['term'].append(term)
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mlist = ldapi.make_modlist(ldap_member, new_member)
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ld.modify_s(user_dn, mlist)
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def register_nonmember(userid, term_list):
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"""Registers a non-member for one or more terms."""
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user_dn = 'uid=%s,%s' % (ldapi.escape(userid), cfg['users_base'])
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if type(term_list) in (str, unicode):
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term_list = [ term_list ]
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ldap_member = get(userid)
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if not ldap_member:
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raise NoSuchMember(userid)
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if 'term' not in ldap_member:
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ldap_member['term'] = []
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if 'nonMemberTerm' not in ldap_member:
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ldap_member['nonMemberTerm'] = []
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new_member = ldap_member.copy()
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new_member['nonMemberTerm'] = new_member['nonMemberTerm'][:]
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for term in term_list:
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# check term syntax
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if not re.match('^[wsf][0-9]{4}$', term):
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raise InvalidTerm(term)
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# add the term to the entry
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if not term in ldap_member['nonMemberTerm'] \
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and not term in ldap_member['term']:
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new_member['nonMemberTerm'].append(term)
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mlist = ldapi.make_modlist(ldap_member, new_member)
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ld.modify_s(user_dn, mlist)
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def registered(userid, term):
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"""
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Determines whether a member is registered
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for a term.
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Parameters:
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userid - the member's username
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term - the term to check
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Returns: whether the member is registered
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Example: registered("mspang", "f2006") -> True
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"""
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member = get(userid)
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return 'term' in member and term in member['term']
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def group_members(group):
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"""
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Returns a list of group members
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"""
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group = ldapi.lookup(ld, 'cn', group, cfg['groups_base'])
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if group and 'uniqueMember' in group:
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r = re.compile('^uid=([^,]*)')
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return map(lambda x: r.match(x).group(1), group['uniqueMember'])
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return []
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def expired_accounts():
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members = ldapi.search(ld, cfg['users_base'],
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'(&(objectClass=member)(!(|(term=%s)(nonMemberTerm=%s))))' %
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(terms.current(), terms.current()))
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return dict([(member[0], member[1]) for member in members])
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def send_account_expired_email(name, email):
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args = [ cfg['expired_account_email'], name, email ]
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os.spawnv(os.P_WAIT, cfg['expired_account_email'], args)
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