aif-ng/aif/system/users.py

415 lines
18 KiB
Python

# There isn't a python package that can manage *NIX users (well), unfortunately.
# So we do something stupid:
# https://www.tldp.org/LDP/sag/html/adduser.html
# https://unix.stackexchange.com/a/153227/284004
# https://wiki.archlinux.org/index.php/users_and_groups#File_list
import datetime
import os
import re
import warnings
##
import passlib.context
import passlib.hash
##
import aif.utils
import aif.constants_fallback
_skipline_re = re.compile(r'^\s*(#|$)')
_now = datetime.datetime.utcnow()
_epoch = datetime.datetime.fromtimestamp(0)
_since_epoch = _now - _epoch
# TODO: still need to generate UID/GIDs for new groups and users
class Group(object):
def __init__(self, group_xml):
self.xml = group_xml
self.name = None
self.gid = None
self.password = None
self.create = False
self.admins = set()
self.members = set()
self.group_entry = []
self.gshadow_entry = []
if self.xml is not None:
self.name = self.xml.attrib['name']
self.gid = self.xml.attrib.get('gid')
# TODO: add to XML?
self.password = Password(self.xml.attrib.get('password'), gshadow = True)
self.password.detectHashType()
self.create = aif.utils.xmlBool(self.xml.attrib.get('create', 'false'))
if self.gid:
self.gid = int(self.gid)
else:
if not self.password:
self.password = '!!'
def genFileLine(self):
if not self.gid:
raise RuntimeError(('Group objects must have a gid set before their '
'group/gshadow entries can be generated'))
# group(5)
self.group_entry = [self.name, # Group name
'x', # Password, normally, but we use shadow for this
self.gid, # GID
','.join(self.members)] # Comma-separated members
# gshadow(5)
self.gshadow_entry = [self.name, # Group name
(self.password.hash if self.password.hash else '!!'), # Password hash (if it has one)
','.join(self.admins), # Users with administrative control of group
','.join(self.members)] # Comma-separated members of group
return()
def parseGroupLine(self, line):
groupdict = dict(zip(['name', 'password', 'gid', 'members'],
line.split(':')))
members = [i for i in groupdict['members'].split(',') if i.strip() != '']
if members:
self.members = set(members)
self.gid = int(groupdict['gid'])
self.name = groupdict['name']
return()
def parseGshadowLine(self, line):
groupdict = dict(zip(['name', 'password', 'admins', 'members'],
line.split(':')))
self.password = Password(None, gshadow = True)
self.password.hash = groupdict['password']
self.password.detectHashType()
admins = [i for i in groupdict['admins'].split(',') if i.strip() != '']
members = [i for i in groupdict['members'].split(',') if i.strip() != '']
if admins:
self.admins = set(admins)
if members:
self.members = set(members)
return()
class Password(object):
def __init__(self, password_xml, gshadow = False):
self.xml = password_xml
self._is_gshadow = gshadow
if not self._is_gshadow:
self.disabled = False
self.password = None
self.hash = None
self.hash_type = None
self.hash_rounds = None
self._pass_context = passlib.context.CryptContext(schemes = ['{0}_crypt'.format(i)
for i in
aif.constants_fallback.CRYPT_SUPPORTED_HASHTYPES])
if self.xml is not None:
if not self._is_gshadow:
self.disabled = aif.utils.xmlBool(self.xml.attrib.get('locked', 'false'))
self._password_xml = self.xml.xpath('passwordPlain|passwordHash')
if self._password_xml is not None:
self._password_xml = self._password_xml[0]
if self._password_xml.tag == 'passwordPlain':
self.password = self._password_xml.text.strip()
self.hash_type = self._password_xml.attrib.get('hashType', 'sha512')
# 5000 rounds is the crypt(3) default.
self.hash_rounds = int(self._password_xml.get('rounds', 5000))
self._pass_context.update(default = '{0}_crypt'.format(self.hash_type))
self.hash = passlib.hash.sha512_crypt.using(rounds = self.hash_rounds).hash(self.password)
else:
self.hash = self._password_xml.text.strip()
self.hash_type = self._password_xml.attrib.get('hashType', '(detect)')
if self.hash_type == '(detect)':
self.detectHashType()
else:
if not self._is_gshadow:
self.disabled = True
self.hash = ''
def detectHashType(self):
if not self.hash.startswith('$'):
if not self._is_gshadow:
self.disabled = True
self.hash = re.sub(r'^[^$]+($)?', r'\g<1>', self.hash)
if self.hash not in ('', None):
self.hash_type = re.sub(r'_crypt$', '', self._pass_context.identify(self.hash))
if not self.hash_type:
warnings.warn('Could not determine hash type')
return()
class User(object):
def __init__(self, user_xml):
self.xml = user_xml
self.name = None
self.uid = None
self.primary_group = None
self.password = None
self.sudo = None
self.comment = None
self.shell = None
self.minimum_age = None
self.maximum_age = None
self.warning_period = None
self.inactive_period = None
self.expire_date = None
self.groups = []
self.passwd_entry = []
self.shadow_entry = []
self._initVals()
def _initVals(self):
if self.xml is None:
# We manually assign these.
return()
self.name = self.xml.attrib['name']
self.password = Password(self.xml.find('password'))
self.sudo = aif.utils.xmlBool(self.xml.attrib.get('sudo', 'false'))
self.home = self.xml.attrib.get('home', '/home/{0}'.format(self.name))
self.uid = self.xml.attrib.get('uid')
if self.uid is not None:
self.uid = int(self.uid)
self.primary_group = Group(None)
self.primary_group.name = self.xml.attrib.get('group', self.name)
self.primary_group.gid = self.xml.attrib.get('gid')
if self.primary_group.gid is not None:
self.primary_group.gid = int(self.primary_group.gid)
self.primary_group.create = True
self.primary_group.members.add(self.name)
self.shell = self.xml.attrib.get('shell', '/bin/bash')
self.comment = self.xml.attrib.get('comment')
self.minimum_age = int(self.xml.attrib.get('minAge', 0))
self.maximum_age = int(self.xml.attrib.get('maxAge', 0))
self.warning_period = int(self.xml.attrib.get('warnDays', 0))
self.inactive_period = int(self.xml.attrib.get('inactiveDays', 0))
self.expire_date = self.xml.attrib.get('expireDate')
self.last_change = _since_epoch.days - 1
if self.expire_date is not None:
# https://www.w3.org/TR/xmlschema-2/#dateTime
try:
self.expire_date = datetime.datetime.fromtimestamp(int(self.expire_date)) # It's an Epoch
except ValueError:
self.expire_date = re.sub(r'^[+-]', '', self.expire_date) # Strip the useless prefix
# Combine the offset into a strftime/strptime-friendly offset
self.expire_date = re.sub(r'([+-])([0-9]{2}):([0-9]{2})$', r'\g<1>\g<2>\g<3>', self.expire_date)
_common = '%Y-%m-%dT%H:%M:%S'
for t in ('{0}%z'.format(_common), '{0}Z'.format(_common), '{0}.%f%z'.format(_common)):
try:
self.expire_date = datetime.datetime.strptime(self.expire_date, t)
break
except ValueError:
continue
for group_xml in self.xml.findall('xGroup'):
g = Group(group_xml)
g.members.add(self.name)
self.groups.append(g)
return()
def genFileLine(self):
if not all((self.uid, self.primary_group.gid)):
raise RuntimeError(('User objects must have a uid and primary_group.gid set before their '
'passwd/shadow entries can be generated'))
# passwd(5)
self.passwd_entry = [self.name, # Username
'x', # self.password.hash is not used because shadow, but this would be password
str(self.uid), # UID
str(self.gid), # GID
(self.comment if self.comment else ''), # GECOS
self.home, # Home directory
self.shell] # Shell
# shadow(5)
self.shadow_entry = [self.name, # Username
self.password.hash, # Password hash (duh)
(str(self.last_change) if self.last_change else ''), # Days since epoch last passwd change
(str(self.minimum_age) if self.minimum_age else '0'), # Minimum password age
(str(self.maximum_age) if self.maximum_age else ''), # Maximum password age
(str(self.warning_period) if self.warning_period else ''), # Passwd expiry warning period
(str(self.inactive_period) if self.inactive_period else ''), # Password inactivity period
(str((self.expire_date - _epoch).days) if self.expire_date else ''), # Expiration date
''] # "Reserved"
return()
def parseShadowLine(self, line):
shadowdict = dict(zip(['name', 'password', 'last_change', 'minimum_age', 'maximum_age', 'warning_period',
'inactive_period', 'expire_date', 'RESERVED'],
line.split(':')))
self.name = shadowdict['name']
self.password = Password(None)
self.password.hash = shadowdict['password']
self.password.detectHashType()
for i in ('last_change', 'minimum_age', 'maximum_age', 'warning_period', 'inactive_period'):
if shadowdict[i].strip() == '':
setattr(self, i, None)
else:
setattr(self, i, int(shadowdict[i]))
if shadowdict['expire_date'].strip() == '':
self.expire_date = None
else:
self.expire_date = datetime.datetime.fromtimestamp(shadowdict['expire_date'])
return(shadowdict)
def parsePasswdLine(self, line):
userdict = dict(zip(['name', 'password', 'uid', 'gid', 'comment', 'home', 'shell'],
line.split(':')))
self.name = userdict['name']
self.primary_group = int(userdict['gid']) # This gets transformed by UserDB() to the proper Group() obj
self.uid = int(userdict['uid'])
for k in ('home', 'shell'):
if userdict[k].strip() != '':
setattr(self, k, userdict[k])
return()
class UserDB(object):
def __init__(self, chroot_base, rootpass_xml, users_xml):
self.rootpass = Password(rootpass_xml)
self.xml = users_xml
self.sys_users = []
self.sys_groups = []
self.new_users = []
self.new_groups = []
self._valid_uids = {'sys': set(),
'user': set()}
self._valid_gids = {'sys': set(),
'user': set()}
self.passwd_file = os.path.join(chroot_base, 'etc', 'passwd')
self.shadow_file = os.path.join(chroot_base, 'etc', 'shadow')
self.group_file = os.path.join(chroot_base, 'etc', 'group')
self.gshadow_file = os.path.join(chroot_base, 'etc', 'gshadow')
self.logindefs_file = os.path.join(chroot_base, 'etc', 'login.defs')
self.login_defaults = {}
self._parseLoginDefs()
self._parseShadow()
self._parseXML()
def _parseLoginDefs(self):
with open(self.logindefs_file, 'r') as fh:
logindefs = fh.read().splitlines()
for line in logindefs:
if _skipline_re.search(line):
continue
l = [i.strip() for i in line.split(None, 1)]
if len(l) < 2:
l.append(None)
self.login_defaults[l[0]] = l[1]
# Convert to native objects
for k in ('FAIL_DELAY', 'PASS_MAX_DAYS', 'PASS_MIN_DAYS', 'PASS_WARN_AGE', 'UID_MIN', 'UID_MAX',
'SYS_UID_MIN', 'SYS_UID_MAX', 'GID_MIN', 'GID_MAX', 'SYS_GID_MIN', 'SYS_GID_MAX', 'LOGIN_RETRIES',
'LOGIN_TIMEOUT', 'LASTLOG_UID_MAX', 'MAX_MEMBERS_PER_GROUP', 'SHA_CRYPT_MIN_ROUNDS',
'SHA_CRYPT_MAX_ROUNDS', 'SUB_GID_MIN', 'SUB_GID_MAX', 'SUB_GID_COUNT', 'SUB_UID_MIN', 'SUB_UID_MAX',
'SUB_UID_COUNT'):
if k in self.login_defaults.keys():
self.login_defaults[k] = int(self.login_defaults[k])
for k in ('TTYPERM', ):
if k in self.login_defaults.keys():
self.login_defaults[k] = int(self.login_defaults[k], 8)
for k in ('ERASECHAR', 'KILLCHAR', 'UMASK'):
if k in self.login_defaults.keys():
v = self.login_defaults[k]
if v.startswith('0x'):
v = int(v, 16)
elif v.startswith('0'):
v = int(v, 8)
else:
v = int(v)
self.login_defaults[k] = v
for k in ('LOG_UNKFAIL_ENAB', 'LOG_OK_LOGINS', 'SYSLOG_SU_ENAB', 'SYSLOG_SG_ENAB', 'DEFAULT_HOME',
'CREATE_HOME', 'USERGROUPS_ENAB', 'MD5_CRYPT_ENAB'):
if k in self.login_defaults.keys():
v = self.login_defaults[k].lower()
self.login_defaults[k] = (True if v == 'yes' else False)
return()
def _parseShadow(self):
sys_shadow = {}
users = {}
groups = {}
for f in ('shadow', 'passwd', 'group', 'gshadow'):
sys_shadow[f] = []
with open(getattr(self, '{0}_file'.format(f)), 'r') as fh:
for line in fh.read().splitlines():
if _skipline_re.search(line):
continue
sys_shadow[f].append(line)
for groupline in sys_shadow['group']:
g = Group(None)
g.parseGroupLine(groupline)
groups[g.gid] = g
for gshadowline in sys_shadow['gshadow']:
g = [i for i in groups.values() if i.name == gshadowline.split(':')[0]][0]
g.parseGshadowLine(gshadowline)
self.sys_groups.append(g)
self.new_groups.append(g)
for userline in sys_shadow['passwd']:
u = User(None)
u.parsePasswdLine(userline)
users[u.name] = u
for shadowline in sys_shadow['shadow']:
u = users[shadowline.split(':')[0]]
u.parseShadowLine(shadowline)
self.sys_users.append(u)
self.new_users.append(u)
# Now that we've native-ized the above, we need to do some associations.
for user in self.sys_users:
for group in self.sys_groups:
if not isinstance(user.primary_group, Group) and user.primary_group == group.gid:
user.primary_group = group
if user.name in group.members and group != user.primary_group:
user.groups.append(group)
if self.rootpass:
rootuser = users['root']
rootuser.password = self.rootpass
rootuser.password.detectHashType()
return()
def _parseXML(self):
for user_xml in self.xml.findall('user'):
u = User(user_xml)
# TODO: need to do unique checks for users and groups (especially for groups if create = True)
# TODO: writer? sort by uid/gid? group membership parsing with create = False?
# TODO: system accounts?
if not u.uid:
u.uid = self.getAvailUID()
if not u.primary_group.gid:
u.primary_group.gid = self.getAvailGID()
self.new_users.append(u)
self.new_groups.append(u.primary_group)
for g in u.groups:
if not g.gid:
g.gid = self.getAvailGID()
self.new_groups.extend(u.groups)
return()
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)