527 lines
24 KiB
Python
527 lines
24 KiB
Python
# There isn't a python package that can manage *NIX users (well), unfortunately.
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# So we do something stupid:
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# https://www.tldp.org/LDP/sag/html/adduser.html
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# https://unix.stackexchange.com/a/153227/284004
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# https://wiki.archlinux.org/index.php/users_and_groups#File_list
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import datetime
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import logging
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import os
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import re
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import shutil
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import warnings
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##
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import passlib.context
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import passlib.hash
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##
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import aif.utils
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import aif.constants_fallback
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_logger = logging.getLogger(__name__)
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_skipline_re = re.compile(r'^\s*(#|$)')
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_now = datetime.datetime.utcnow()
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_epoch = datetime.datetime.fromtimestamp(0)
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_since_epoch = _now - _epoch
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class Group(object):
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def __init__(self, group_xml):
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self.xml = group_xml
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self.name = None
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self.gid = None
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self.password = None
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self.create = False
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self.admins = set()
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self.members = set()
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self.group_entry = []
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self.gshadow_entry = []
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if self.xml is not None:
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self.name = self.xml.attrib['name']
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self.gid = self.xml.attrib.get('gid')
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# TODO: add to XML?
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self.password = Password(self.xml.attrib.get('password'), gshadow = True)
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self.password.detectHashType()
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self.create = aif.utils.xmlBool(self.xml.attrib.get('create', 'false'))
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if self.gid:
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self.gid = int(self.gid)
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else:
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if not self.password:
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self.password = '!!'
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_logger.info('Rendered G=group entry')
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for a in ('name', 'gid', 'password', 'create'):
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_logger.debug('{0}: {1}'.format(a.title(), getattr(self, a)))
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def genFileLine(self):
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if not self.gid:
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_logger.error('Group objects must have a gid set before their group/gshadow entries can be generated')
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raise RuntimeError('Need GID')
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# group(5)
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self.group_entry = [self.name, # Group name
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'x', # Password, normally, but we use shadow for this
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self.gid, # GID
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','.join(self.members)] # Comma-separated members
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# gshadow(5)
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self.gshadow_entry = [self.name, # Group name
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(self.password.hash if self.password.hash else '!!'), # Password hash (if it has one)
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','.join(self.admins), # Users with administrative control of group
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','.join(self.members)] # Comma-separated members of group
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_logger.debug('Rendered group entry: {0}'.format(self.group_entry))
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_logger.debug('Rendered gshadow entry: {0}'.format(self.gshadow_entry))
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return(None)
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def parseGroupLine(self, line):
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groupdict = dict(zip(['name', 'password', 'gid', 'members'],
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line.split(':')))
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members = [i for i in groupdict['members'].split(',') if i.strip() != '']
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if members:
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self.members = set(members)
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self.gid = int(groupdict['gid'])
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self.name = groupdict['name']
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_logger.info('Parsed group line.')
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for a in ('name', 'gid', 'members'):
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_logger.debug('{0}: {1}'.format(a.title(), getattr(self, a)))
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return(None)
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def parseGshadowLine(self, line):
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groupdict = dict(zip(['name', 'password', 'admins', 'members'],
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line.split(':')))
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self.password = Password(None, gshadow = True)
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self.password.hash = groupdict['password']
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self.password.detectHashType()
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admins = [i for i in groupdict['admins'].split(',') if i.strip() != '']
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members = [i for i in groupdict['members'].split(',') if i.strip() != '']
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if admins:
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self.admins = set(admins)
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if members:
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self.members = set(members)
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_logger.info('Parsed gshadow line.')
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for a in ('password', 'admins', 'members'):
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_logger.debug('{0}: {1}'.format(a.title(), getattr(self, a)))
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return(None)
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class Password(object):
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def __init__(self, password_xml, gshadow = False):
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self.xml = password_xml
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self._is_gshadow = gshadow
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if not self._is_gshadow:
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self.disabled = False
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self.password = None
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self.hash = None
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self.hash_type = None
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self.hash_rounds = None
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self._pass_context = passlib.context.CryptContext(schemes = ['{0}_crypt'.format(i)
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for i in
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aif.constants_fallback.CRYPT_SUPPORTED_HASHTYPES])
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if self.xml is not None:
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if not self._is_gshadow:
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self.disabled = aif.utils.xmlBool(self.xml.attrib.get('locked', 'false'))
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self._password_xml = self.xml.xpath('passwordPlain|passwordHash')
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if self._password_xml:
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self._password_xml = self._password_xml[0]
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if self._password_xml.tag == 'passwordPlain':
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self.password = self._password_xml.text.strip()
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self.hash_type = self._password_xml.attrib.get('hashType', 'sha512')
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# 5000 rounds is the crypt(3) default.
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self.hash_rounds = int(self._password_xml.get('rounds', 5000))
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self._pass_context.update(default = '{0}_crypt'.format(self.hash_type))
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self.hash = passlib.hash.sha512_crypt.using(rounds = self.hash_rounds).hash(self.password)
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else:
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self.hash = self._password_xml.text.strip()
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self.hash_type = self._password_xml.attrib.get('hashType', '(detect)')
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if self.hash_type == '(detect)':
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self.detectHashType()
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else:
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if not self._is_gshadow:
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self.disabled = True
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self.hash = ''
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def detectHashType(self):
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if not self.hash.startswith('$'):
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if not self._is_gshadow:
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self.disabled = True
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self.hash = re.sub(r'^[^$]+($)?', r'\g<1>', self.hash)
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if self.hash not in ('', None):
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self.hash_type = re.sub(r'_crypt$', '', self._pass_context.identify(self.hash))
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if not self.hash_type:
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_logger.warning('Unable to detect hash type for string {0}'.format(self.hash))
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warnings.warn('Could not determine hash type')
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return(None)
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class User(object):
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def __init__(self, user_xml):
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self.xml = user_xml
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self.name = None
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self.uid = None
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self.primary_group = None
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self.password = None
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self.sudo = None
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self.sudoPassword = True
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self.comment = None
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self.shell = None
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self.minimum_age = None
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self.maximum_age = None
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self.warning_period = None
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self.inactive_period = None
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self.expire_date = None
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self.new = False
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self.groups = []
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self.passwd_entry = []
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self.shadow_entry = []
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self._initVals()
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def _initVals(self):
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if self.xml is None:
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_logger.debug('Instantiated blank User object.')
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# We manually assign these.
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return(None)
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self.name = self.xml.attrib['name']
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# XML declared users are always new.
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self.new = True
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self.password = Password(self.xml.find('password'))
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self.sudo = aif.utils.xmlBool(self.xml.attrib.get('sudo', 'false'))
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self.sudoPassword = aif.utils.xmlBool(self.xml.attrib.get('sudoPassword', 'true'))
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self.home = self.xml.attrib.get('home', '/home/{0}'.format(self.name))
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self.uid = self.xml.attrib.get('uid')
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if self.uid:
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self.uid = int(self.uid)
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self.primary_group = Group(None)
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self.primary_group.name = self.xml.attrib.get('group', self.name)
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self.primary_group.gid = self.xml.attrib.get('gid')
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if self.primary_group.gid:
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self.primary_group.gid = int(self.primary_group.gid)
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self.primary_group.create = True
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self.primary_group.members.add(self.name)
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self.shell = self.xml.attrib.get('shell', '/bin/bash')
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self.comment = self.xml.attrib.get('comment')
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self.minimum_age = int(self.xml.attrib.get('minAge', 0))
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self.maximum_age = int(self.xml.attrib.get('maxAge', 0))
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self.warning_period = int(self.xml.attrib.get('warnDays', 0))
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self.inactive_period = int(self.xml.attrib.get('inactiveDays', 0))
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self.expire_date = self.xml.attrib.get('expireDate')
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self.last_change = _since_epoch.days - 1
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if self.expire_date:
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# https://www.w3.org/TR/xmlschema-2/#dateTime
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try:
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self.expire_date = datetime.datetime.fromtimestamp(int(self.expire_date)) # It's an Epoch
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except ValueError:
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self.expire_date = re.sub(r'^[+-]', '', self.expire_date) # Strip the useless prefix
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# Combine the offset into a strftime/strptime-friendly offset
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self.expire_date = re.sub(r'([+-])([0-9]{2}):([0-9]{2})$', r'\g<1>\g<2>\g<3>', self.expire_date)
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_common = '%Y-%m-%dT%H:%M:%S'
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for t in ('{0}%z'.format(_common), '{0}Z'.format(_common), '{0}.%f%z'.format(_common)):
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try:
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self.expire_date = datetime.datetime.strptime(self.expire_date, t)
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break
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except ValueError:
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continue
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for group_xml in self.xml.findall('xGroup'):
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g = Group(group_xml)
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g.members.add(self.name)
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self.groups.append(g)
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_logger.info('User object for {0} instantiated.'.format(self.name))
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return(None)
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def genFileLine(self):
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if not all((self.uid, self.primary_group.gid)):
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_logger.error(('User objects must have a uid and primary_group.gid set before their passwd/shadow entries '
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'can be generated'))
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raise RuntimeError('Need UID/primary_group.gid')
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# passwd(5)
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self.passwd_entry = [self.name, # Username
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'x', # self.password.hash is not used because shadow, but this would be password
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str(self.uid), # UID
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str(self.gid), # GID
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(self.comment if self.comment else ''), # GECOS
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self.home, # Home directory
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self.shell] # Shell
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# shadow(5)
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self.shadow_entry = [self.name, # Username
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self.password.hash, # Password hash (duh)
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(str(self.last_change) if self.last_change else ''), # Days since epoch last passwd change
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(str(self.minimum_age) if self.minimum_age else '0'), # Minimum password age
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(str(self.maximum_age) if self.maximum_age else ''), # Maximum password age
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(str(self.warning_period) if self.warning_period else ''), # Passwd expiry warning period
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(str(self.inactive_period) if self.inactive_period else ''), # Password inactivity period
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(str((self.expire_date - _epoch).days) if self.expire_date else ''), # Expiration date
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''] # "Reserved"
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_logger.debug('Rendered passwd entry: {0}'.format(self.passwd_entry))
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_logger.debug('Rendered shadow entry: {0}'.format(self.shadow_entry))
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return(None)
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def parsePasswdLine(self, line):
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userdict = dict(zip(['name', 'password', 'uid', 'gid', 'comment', 'home', 'shell'],
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line.split(':')))
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self.name = userdict['name']
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self.primary_group = int(userdict['gid']) # This gets transformed by UserDB() to the proper Group() obj
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self.uid = int(userdict['uid'])
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for k in ('home', 'shell'):
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if userdict[k].strip() != '':
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setattr(self, k, userdict[k])
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_logger.debug('Parsed passwd entry: {0}'.format(userdict))
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return(None)
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def parseShadowLine(self, line):
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shadowdict = dict(zip(['name', 'password', 'last_change', 'minimum_age', 'maximum_age', 'warning_period',
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'inactive_period', 'expire_date', 'RESERVED'],
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line.split(':')))
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self.name = shadowdict['name']
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self.password = Password(None)
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self.password.hash = shadowdict['password']
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self.password.detectHashType()
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for i in ('last_change', 'minimum_age', 'maximum_age', 'warning_period', 'inactive_period'):
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if shadowdict[i].strip() == '':
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setattr(self, i, None)
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else:
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setattr(self, i, int(shadowdict[i]))
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if shadowdict['expire_date'].strip() == '':
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self.expire_date = None
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else:
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self.expire_date = datetime.datetime.fromtimestamp(shadowdict['expire_date'])
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_logger.debug('Parsed shadow entry: {0}'.format(shadowdict))
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return(shadowdict)
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class UserDB(object):
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def __init__(self, chroot_base, rootpass_xml, users_xml):
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self.rootpass = Password(rootpass_xml)
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self.xml = users_xml
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self.chroot_base = chroot_base
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self.sys_users = []
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self.sys_groups = []
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self.new_users = []
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self.new_groups = []
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self._valid_uids = {'sys': set(),
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'user': set()}
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self._valid_gids = {'sys': set(),
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'user': set()}
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self.passwd_file = os.path.join(chroot_base, 'etc', 'passwd')
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self.shadow_file = os.path.join(chroot_base, 'etc', 'shadow')
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self.group_file = os.path.join(chroot_base, 'etc', 'group')
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self.gshadow_file = os.path.join(chroot_base, 'etc', 'gshadow')
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self.logindefs_file = os.path.join(chroot_base, 'etc', 'login.defs')
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self.login_defaults = {}
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self._parseLoginDefs()
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self._parseShadow()
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self._parseXML()
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def _parseLoginDefs(self):
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with open(self.logindefs_file, 'r') as fh:
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logindefs = fh.read().splitlines()
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for line in logindefs:
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if _skipline_re.search(line):
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continue
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l = [i.strip() for i in line.split(None, 1)]
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if len(l) < 2:
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l.append(None)
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self.login_defaults[l[0]] = l[1]
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# Convert to native objects
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for k in ('FAIL_DELAY', 'PASS_MAX_DAYS', 'PASS_MIN_DAYS', 'PASS_WARN_AGE', 'UID_MIN', 'UID_MAX',
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'SYS_UID_MIN', 'SYS_UID_MAX', 'GID_MIN', 'GID_MAX', 'SYS_GID_MIN', 'SYS_GID_MAX', 'LOGIN_RETRIES',
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'LOGIN_TIMEOUT', 'LASTLOG_UID_MAX', 'MAX_MEMBERS_PER_GROUP', 'SHA_CRYPT_MIN_ROUNDS',
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'SHA_CRYPT_MAX_ROUNDS', 'SUB_GID_MIN', 'SUB_GID_MAX', 'SUB_GID_COUNT', 'SUB_UID_MIN', 'SUB_UID_MAX',
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'SUB_UID_COUNT'):
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if k in self.login_defaults.keys():
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self.login_defaults[k] = int(self.login_defaults[k])
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for k in ('TTYPERM', ):
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if k in self.login_defaults.keys():
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self.login_defaults[k] = int(self.login_defaults[k], 8)
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for k in ('ERASECHAR', 'KILLCHAR', 'UMASK'):
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if k in self.login_defaults.keys():
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v = self.login_defaults[k]
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if v.startswith('0x'):
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v = int(v, 16)
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elif v.startswith('0'):
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v = int(v, 8)
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else:
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v = int(v)
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self.login_defaults[k] = v
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for k in ('LOG_UNKFAIL_ENAB', 'LOG_OK_LOGINS', 'SYSLOG_SU_ENAB', 'SYSLOG_SG_ENAB', 'DEFAULT_HOME',
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'CREATE_HOME', 'USERGROUPS_ENAB', 'MD5_CRYPT_ENAB'):
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if k in self.login_defaults.keys():
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v = self.login_defaults[k].lower()
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self.login_defaults[k] = (True if v == 'yes' else False)
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_logger.debug('Parsed login defaults config: {0}'.format(self.login_defaults))
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return(None)
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def _parseShadow(self):
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sys_shadow = {}
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users = {}
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groups = {}
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for f in ('shadow', 'passwd', 'group', 'gshadow'):
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sys_shadow[f] = []
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with open(getattr(self, '{0}_file'.format(f)), 'r') as fh:
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for line in fh.read().splitlines():
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if _skipline_re.search(line):
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continue
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sys_shadow[f].append(line)
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for groupline in sys_shadow['group']:
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g = Group(None)
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g.parseGroupLine(groupline)
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groups[g.gid] = g
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for gshadowline in sys_shadow['gshadow']:
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g = [i for i in groups.values() if i.name == gshadowline.split(':')[0]][0]
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g.parseGshadowLine(gshadowline)
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self.sys_groups.append(g)
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self.new_groups.append(g)
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for userline in sys_shadow['passwd']:
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u = User(None)
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u.parsePasswdLine(userline)
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users[u.name] = u
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for shadowline in sys_shadow['shadow']:
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u = users[shadowline.split(':')[0]]
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u.parseShadowLine(shadowline)
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self.sys_users.append(u)
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self.new_users.append(u)
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# Now that we've native-ized the above, we need to do some associations.
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for user in self.sys_users:
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for group in self.sys_groups:
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if not isinstance(user.primary_group, Group) and user.primary_group == group.gid:
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user.primary_group = group
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if user.name in group.members and group != user.primary_group:
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user.groups.append(group)
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if self.rootpass:
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rootuser = users['root']
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rootuser.password = self.rootpass
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rootuser.password.detectHashType()
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return(None)
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def _parseXML(self):
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for user_xml in self.xml.findall('user'):
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u = User(user_xml)
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# TODO: system accounts?
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if u.name in [i.name for i in self.new_users]:
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_logger.warning('User {0} already specified; skipping to avoid duplicate conflicts.'.format(u.name))
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warnings.warn('User already specified')
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continue
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if not u.uid:
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u.uid = self.getAvailUID()
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if not u.primary_group.gid:
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new_group = [i.name for i in self.new_groups]
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if u.primary_group.name not in new_group:
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if not u.primary_group.gid:
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u.primary_group.gid = self.getAvailGID()
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self.new_groups.append(u.primary_group)
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else:
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u.primary_group = new_group[0]
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for idx, g in enumerate(u.groups[:]):
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new_group = [i.name for i in self.new_groups]
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if g.name not in new_group:
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if not g.gid:
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g.gid = self.getAvailGID()
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self.new_groups.append(g)
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else:
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if not g.create:
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u.groups[idx] = new_group[0]
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self.new_users.append(u)
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return(None)
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|
|
def getAvailUID(self, system = False):
|
|
if not self.login_defaults:
|
|
self._parseLoginDefs()
|
|
if system:
|
|
def_min = int(self.login_defaults.get('SYS_UID_MIN', 500))
|
|
def_max = int(self.login_defaults.get('SYS_UID_MAX', 999))
|
|
k = 'sys'
|
|
else:
|
|
def_min = int(self.login_defaults.get('UID_MIN', 1000))
|
|
def_max = int(self.login_defaults.get('UID_MAX', 60000))
|
|
k = 'user'
|
|
if not self._valid_uids[k]:
|
|
self._valid_uids[k] = set(i for i in range(def_min, (def_max + 1)))
|
|
current_uids = set(i.uid for i in self.new_users)
|
|
uid = min(self._valid_uids[k] - current_uids)
|
|
return(uid)
|
|
|
|
def getAvailGID(self, system = False):
|
|
if not self.login_defaults:
|
|
self._parseLoginDefs()
|
|
if system:
|
|
def_min = int(self.login_defaults.get('SYS_GID_MIN', 500))
|
|
def_max = int(self.login_defaults.get('SYS_GID_MAX', 999))
|
|
k = 'sys'
|
|
else:
|
|
def_min = int(self.login_defaults.get('GID_MIN', 1000))
|
|
def_max = int(self.login_defaults.get('GID_MAX', 60000))
|
|
k = 'user'
|
|
if not self._valid_gids[k]:
|
|
self._valid_gids[k] = set(i for i in range(def_min, (def_max + 1)))
|
|
current_gids = set(i.gid for i in self.new_groups)
|
|
gid = min(self._valid_gids[k] - current_gids)
|
|
return(gid)
|
|
|
|
def writeConf(self):
|
|
# We shouldn't really use this, because root should be at the beginning.
|
|
users_by_name = sorted(self.new_users, key = lambda user: user.name)
|
|
# This automatically puts root first (uid = 0)
|
|
users_by_uid = sorted(self.new_users, key = lambda user: user.uid)
|
|
# Ditto.
|
|
groups_by_name = sorted(self.new_groups, key = lambda group: group.name)
|
|
groups_by_gid = sorted(self.new_groups, key = lambda group: group.gid)
|
|
for x in (self.new_users, self.new_groups):
|
|
for i in x:
|
|
i.genFileLine()
|
|
for f in (self.passwd_file, self.shadow_file, self.group_file, self.gshadow_file):
|
|
backup = '{0}-'.format(f)
|
|
shutil.copy2(f, backup)
|
|
_logger.info('Wrote: {0}'.format(backup))
|
|
with open(self.passwd_file, 'w') as fh:
|
|
for u in users_by_uid:
|
|
fh.write(':'.join(u.passwd_entry))
|
|
fh.write('\n')
|
|
_logger.info('Wrote: {0}'.format(self.passwd_file))
|
|
with open(self.shadow_file, 'w') as fh:
|
|
for u in self.new_users:
|
|
fh.write(':'.join(u.shadow_entry))
|
|
fh.write('\n')
|
|
_logger.info('Wrote: {0}'.format(self.shadow_file))
|
|
with open(self.group_file, 'w') as fh:
|
|
for g in groups_by_gid:
|
|
fh.write(':'.join(g.group_entry))
|
|
fh.write('\n')
|
|
_logger.info('Wrote: {0}'.format(self.group_file))
|
|
with open(self.gshadow_file, 'w') as fh:
|
|
for g in self.new_users:
|
|
fh.write(':'.join(g.gshadow_entry))
|
|
fh.write('\n')
|
|
_logger.info('Wrote: {0}'.format(self.gshadow_file))
|
|
for u in self.new_users:
|
|
if u.new:
|
|
homedir = os.path.join(self.chroot_base, u.home)
|
|
# We only set perms for the homedir itself. It's up to the user to specify in a post script if this
|
|
# needs to be different.
|
|
if os.path.isdir(homedir):
|
|
stats = os.stat(homedir)
|
|
_logger.warning('Homedir {0} for user {1} already exists; original stat: {2}'.format(homedir,
|
|
u.name,
|
|
stats))
|
|
os.makedirs(homedir, exist_ok = True)
|
|
shutil.copytree(os.path.join(self.chroot_base, 'etc', 'skel'), homedir)
|
|
os.chown(homedir, u.uid, u.primary_group.gid)
|
|
os.chmod(homedir, 0o0750)
|
|
for root, dirs, files in os.walk(homedir):
|
|
for d in dirs:
|
|
dpath = os.path.join(root, d)
|
|
os.chown(dpath, u.uid, u.primary_group.gid)
|
|
os.chmod(dpath, 0o0700)
|
|
for f in files:
|
|
fpath = os.path.join(root, f)
|
|
os.chown(fpath, u.uid, u.primary_group.gid)
|
|
os.chmod(fpath, 0o0600)
|
|
if not u.sudo:
|
|
continue
|
|
sudo_file = os.path.join(self.chroot_base, 'etc', 'sudoers.d', u.name)
|
|
with open(sudo_file, 'w') as fh:
|
|
fh.write(('# Generated by AIF-NG.\n'
|
|
'Defaults:{0} !lecture\n'
|
|
'{0} ALL=(ALL) {1}ALL\n').format(u.name,
|
|
('NOPASSWD: ' if not u.sudoPassword else '')))
|
|
os.chown(sudo_file, 0, 0)
|
|
os.chmod(sudo_file, 0o0440)
|
|
_logger.info('Wrote: {0}'.format(sudo_file))
|
|
return(None)
|