freeipa/ipaserver/install/ldapupdate.py

870 lines
32 KiB
Python

# Authors: Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2008 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Documentation can be found at http://freeipa.org/page/LdapUpdate
# TODO
# save undo files?
UPDATES_DIR="/usr/share/ipa/updates/"
import sys
import uuid
import platform
import time
import os
import pwd
import fnmatch
import csv
import re
import krbV
import ldap
from ipaserver.install import installutils
from ipapython import ipautil, ipaldap
from ipalib import errors
from ipalib import api
from ipapython.dn import DN
from ipapython.ipa_log_manager import *
from ipaserver.install.plugins import PRE_UPDATE, POST_UPDATE
from ipaserver.plugins import ldap2
def connect(ldapi=False, realm=None, fqdn=None, dm_password=None, pw_name=None):
"""Create a connection for updates"""
if ldapi:
conn = ipaldap.IPAdmin(ldapi=True, realm=realm, decode_attrs=False)
else:
conn = ipaldap.IPAdmin(fqdn, ldapi=False, realm=realm, decode_attrs=False)
try:
if dm_password:
conn.do_simple_bind(binddn=DN(('cn', 'directory manager')),
bindpw=dm_password)
elif os.getegid() == 0:
try:
# autobind
conn.do_external_bind(pw_name)
except errors.NotFound:
# Fall back
conn.do_sasl_gssapi_bind()
else:
conn.do_sasl_gssapi_bind()
except (ldap.CONNECT_ERROR, ldap.SERVER_DOWN):
raise RuntimeError("Unable to connect to LDAP server %s" % fqdn)
except ldap.INVALID_CREDENTIALS:
raise RuntimeError(
"The password provided is incorrect for LDAP server %s" % fqdn)
except ldap.LOCAL_ERROR, e:
raise RuntimeError('%s' % e.args[0].get('info', '').strip())
return conn
class BadSyntax(installutils.ScriptError):
def __init__(self, value):
self.value = value
self.msg = "LDAPUpdate: syntax error: \n %s" % value
self.rval = 1
def __str__(self):
return repr(self.value)
def safe_output(attr, values):
"""
Sanitizes values we do not want logged, like passwords.
This should be called in all debug statements that output values.
This list does not necessarily need to be exhaustive given the limited
scope of types of values that the updater manages.
This only supports lists, tuples and strings. If you pass a dict you may
get a string back.
"""
sensitive_attributes = ['krbmkey', 'userpassword', 'passwordhistory', 'krbprincipalkey', 'sambalmpassword', 'sambantpassword', 'ipanthash']
if attr.lower() in sensitive_attributes:
if type(values) in (tuple, list):
# try to still look a little like what is in LDAP
return ['XXXXXXX'] * len(values)
else:
return 'XXXXXXXX'
else:
return values
class LDAPUpdate:
action_keywords = ["default", "add", "remove", "only", "onlyifexist", "deleteentry", "replace", "addifnew", "addifexist"]
def __init__(self, dm_password, sub_dict={}, live_run=True,
online=True, ldapi=False, plugins=False):
'''
:parameters:
dm_password
Directory Manager password
sub_dict
substitution dictionary
live_run
Apply the changes or just test
online
Do an online LDAP update or use an experimental LDIF updater
ldapi
Bind using ldapi. This assumes autobind is enabled.
plugins
execute the pre/post update plugins
Data Structure Example:
-----------------------
dn_by_rdn_count = {
3: 'cn=config,dc=example,dc=com':
4: 'cn=bob,ou=people,dc=example,dc=com',
}
all_updates = {
'dn': 'cn=config,dc=example,dc=com':
{
'dn': 'cn=config,dc=example,dc=com',
'default': ['attr1':default1'],
'updates': ['action:attr1:value1',
'action:attr2:value2]
},
'dn': 'cn=bob,ou=people,dc=example,dc=com':
{
'dn': 'cn=bob,ou=people,dc=example,dc=com',
'default': ['attr3':default3'],
'updates': ['action:attr3:value3',
'action:attr4:value4],
}
}
The default and update lists are "dispositions"
'''
log_mgr.get_logger(self, True)
self.sub_dict = sub_dict
self.live_run = live_run
self.dm_password = dm_password
self.conn = None
self.modified = False
self.online = online
self.ldapi = ldapi
self.plugins = plugins
self.pw_name = pwd.getpwuid(os.geteuid()).pw_name
self.realm = None
suffix = None
if sub_dict.get("REALM"):
self.realm = sub_dict["REALM"]
else:
krbctx = krbV.default_context()
try:
self.realm = krbctx.default_realm
suffix = ipautil.realm_to_suffix(self.realm)
except krbV.Krb5Error:
self.realm = None
suffix = None
if suffix is not None:
assert isinstance(suffix, DN)
domain = ipautil.get_domain_name()
libarch = self._identify_arch()
fqdn = installutils.get_fqdn()
if fqdn is None:
raise RuntimeError("Unable to determine hostname")
fqhn = fqdn # Save this for the sub_dict variable
if self.ldapi:
fqdn = "ldapi://%%2fvar%%2frun%%2fslapd-%s.socket" % "-".join(
self.realm.split(".")
)
if not self.sub_dict.get("REALM") and self.realm is not None:
self.sub_dict["REALM"] = self.realm
if not self.sub_dict.get("FQDN"):
self.sub_dict["FQDN"] = fqhn
if not self.sub_dict.get("DOMAIN"):
self.sub_dict["DOMAIN"] = domain
if not self.sub_dict.get("SUFFIX") and suffix is not None:
self.sub_dict["SUFFIX"] = suffix
if not self.sub_dict.get("ESCAPED_SUFFIX"):
self.sub_dict["ESCAPED_SUFFIX"] = str(suffix)
if not self.sub_dict.get("LIBARCH"):
self.sub_dict["LIBARCH"] = libarch
if not self.sub_dict.get("TIME"):
self.sub_dict["TIME"] = int(time.time())
if not self.sub_dict.get("DOMAIN") and domain is not None:
self.sub_dict["DOMAIN"] = domain
if online:
# Try out the connection/password
# (This will raise if the server is not available)
self.create_connection()
self.conn.unbind()
self.conn = None
else:
raise RuntimeError("Offline updates are not supported.")
# The following 2 functions were taken from the Python
# documentation at http://docs.python.org/library/csv.html
def _utf_8_encoder(self, unicode_csv_data):
for line in unicode_csv_data:
yield line.encode('utf-8')
def _unicode_csv_reader(self, unicode_csv_data, quote_char="'", dialect=csv.excel, **kwargs):
# csv.py doesn't do Unicode; encode temporarily as UTF-8:
csv_reader = csv.reader(self._utf_8_encoder(unicode_csv_data),
dialect=dialect, delimiter=',',
quotechar=quote_char,
skipinitialspace=True,
**kwargs)
for row in csv_reader:
yield row
def _identify_arch(self):
"""On multi-arch systems some libraries may be in /lib64, /usr/lib64,
etc. Determine if a suffix is needed based on the current
architecture.
"""
bits = platform.architecture()[0]
if bits == "64bit":
return "64"
else:
return ""
def _template_str(self, s):
try:
return ipautil.template_str(s, self.sub_dict)
except KeyError, e:
raise BadSyntax("Unknown template keyword %s" % e)
def _parse_values(self, line):
"""Parse a comma-separated string into separate values and convert them
into a list. This should handle quoted-strings with embedded commas
"""
if line[0] == "'":
quote_char = "'"
else:
quote_char = '"'
reader = self._unicode_csv_reader([line], quote_char)
value = []
for row in reader:
value = value + row
return value
def read_file(self, filename):
if filename == '-':
fd = sys.stdin
else:
fd = open(filename)
text = fd.readlines()
if fd != sys.stdin: fd.close()
return text
def _combine_updates(self, all_updates, update):
'Combine a new update with the list of total updates'
dn = update.get('dn')
assert isinstance(dn, DN)
if not all_updates.get(dn):
all_updates[dn] = update
return
existing_update = all_updates[dn]
if 'default' in update:
disposition_list = existing_update.setdefault('default', [])
disposition_list.extend(update['default'])
elif 'updates' in update:
disposition_list = existing_update.setdefault('updates', [])
disposition_list.extend(update['updates'])
else:
self.debug("Unknown key in updates %s" % update.keys())
def merge_updates(self, all_updates, updates):
'''
Add the new_update dict to the all_updates dict. If an entry
in the new_update already has an entry in all_updates merge
the two entries sensibly assuming the new entries take
precedence. Otherwise just add the new entry.
'''
for new_update in updates:
for new_dn, new_entry in new_update.iteritems():
existing_entry = all_updates.get(new_dn)
if existing_entry:
# If the existing entry is marked for deletion but the
# new entry is not also a delete then clear the delete
# flag otherwise the newer update will be lost.
if existing_entry.has_key('deleteentry') and not new_entry.has_key('deleteentry'):
self.warning("ldapupdate: entry '%s' previously marked for deletion but" +
" this subsequent update reestablishes it: %s", new_dn, new_entry)
del existing_entry['deleteentry']
existing_entry.update(new_entry)
else:
all_updates[new_dn] = new_entry
def parse_update_file(self, data_source_name, source_data, all_updates):
"""Parse the update file into a dictonary of lists and apply the update
for each DN in the file."""
update = {}
logical_line = ""
action = ""
dn = None
lcount = 0
def emit_item(logical_line):
'''
Given a logical line containing an item to process perform the following:
* Strip leading & trailing whitespace
* Substitute any variables
* Get the action, attribute, and value
* Each update has one list per disposition, append to specified disposition list
'''
logical_line = logical_line.strip()
if logical_line == '':
return
# Perform variable substitution on constructued line
logical_line = self._template_str(logical_line)
items = logical_line.split(':', 2)
if len(items) == 0:
raise BadSyntax, "Bad formatting on line %s:%d: %s" % (data_source_name, lcount, logical_line)
action = items[0].strip().lower()
if action not in self.action_keywords:
raise BadSyntax, "Unknown update action '%s', data source=%s" % (action, data_source_name)
if action == 'deleteentry':
new_value = None
disposition = "deleteentry"
else:
if len(items) != 3:
raise BadSyntax, "Bad formatting on line %s:%d: %s" % (data_source_name, lcount, logical_line)
attr = items[1].strip()
value = items[2].strip()
if action == "default":
new_value = attr + ":" + value
disposition = "default"
else:
new_value = action + ":" + attr + ":" + value
disposition = "updates"
disposition_list = update.setdefault(disposition, [])
disposition_list.append(new_value)
def emit_update(update):
'''
When processing a dn is completed emit the update by merging it into
the set of all updates.
'''
self._combine_updates(all_updates, update)
# Iterate over source input lines
for source_line in source_data:
lcount += 1
# strip trailing whitespace and newline
source_line = source_line.rstrip()
# skip comments and empty lines
if source_line.startswith('#') or source_line == '':
continue
if source_line.lower().startswith('dn:'):
# Starting new dn
if dn is not None:
# Emit previous dn
emit_item(logical_line)
logical_line = ''
emit_update(update)
update = {}
dn = source_line[3:].strip()
dn = DN(self._template_str(dn))
update['dn'] = dn
else:
# Process items belonging to dn
if dn is None:
raise BadSyntax, "dn is not defined in the update, data source=%s" % (data_source_name)
# If continuation line, append to existing logical line & continue,
# otherwise flush the previous item.
if source_line.startswith(' '):
logical_line += source_line[1:]
continue
else:
emit_item(logical_line)
logical_line = ''
logical_line = source_line
if dn is not None:
emit_item(logical_line)
logical_line = ''
emit_update(update)
update = {}
return all_updates
def create_index_task(self, attribute):
"""Create a task to update an index for an attribute"""
# Sleep a bit to ensure previous operations are complete
if self.live_run:
time.sleep(5)
cn_uuid = uuid.uuid1()
# cn_uuid.time is in nanoseconds, but other users of LDAPUpdate expect
# seconds in 'TIME' so scale the value down
self.sub_dict['TIME'] = int(cn_uuid.time/1e9)
cn = "indextask_%s_%s_%s" % (attribute, cn_uuid.time, cn_uuid.clock_seq)
dn = DN(('cn', cn), ('cn', 'index'), ('cn', 'tasks'), ('cn', 'config'))
e = self.conn.make_entry(
dn,
objectClass=['top', 'extensibleObject'],
cn=[cn],
nsInstance=['userRoot'],
nsIndexAttribute=[attribute],
)
self.info("Creating task to index attribute: %s", attribute)
self.debug("Task id: %s", dn)
if self.live_run:
self.conn.add_entry(e)
return dn
def monitor_index_task(self, dn):
"""Give a task DN monitor it and wait until it has completed (or failed)
"""
assert isinstance(dn, DN)
if not self.live_run:
# If not doing this live there is nothing to monitor
return
# Pause for a moment to give the task time to be created
time.sleep(1)
attrlist = ['nstaskstatus', 'nstaskexitcode']
entry = None
while True:
try:
entry = self.conn.get_entry(dn, attrlist)
except errors.NotFound, e:
self.error("Task not found: %s", dn)
return
except errors.DatabaseError, e:
self.error("Task lookup failure %s", e)
return
status = entry.single_value.get('nstaskstatus')
if status is None:
# task doesn't have a status yet
time.sleep(1)
continue
if status.lower().find("finished") > -1:
self.info("Indexing finished")
break
self.debug("Indexing in progress")
time.sleep(1)
return
def _create_default_entry(self, dn, default):
"""Create the default entry from the values provided.
The return type is ipaldap.LDAPEntry
"""
assert isinstance(dn, DN)
entry = self.conn.make_entry(dn)
if not default:
# This means that the entire entry needs to be created with add
return entry
for item in default:
# We already do syntax-parsing so this is safe
(attr, value) = item.split(':',1)
e = entry.get(attr)
if e:
# multi-valued attribute
e = list(e)
e.append(value)
else:
e = [value]
entry[attr] = e
entry.reset_modlist()
return entry
def _get_entry(self, dn):
"""Retrieve an object from LDAP.
The return type is ipaldap.LDAPEntry
"""
assert isinstance(dn, DN)
searchfilter="objectclass=*"
sattrs = ["*", "aci", "attributeTypes", "objectClasses"]
scope = ldap.SCOPE_BASE
return self.conn.get_entries(dn, scope, searchfilter, sattrs)
def _apply_update_disposition(self, updates, entry):
"""
updates is a list of changes to apply
entry is the thing to apply them to
Returns the modified entry
"""
if not updates:
return entry
only = {}
for update in updates:
# We already do syntax-parsing so this is safe
(action, attr, update_values) = update.split(':',2)
update_values = self._parse_values(update_values)
entry_values = entry.get(attr, [])
for update_value in update_values:
if action == 'remove':
self.debug("remove: '%s' from %s, current value %s", safe_output(attr, update_value), attr, safe_output(attr,entry_values))
try:
entry_values.remove(update_value)
except ValueError:
self.warning("remove: '%s' not in %s", update_value, attr)
pass
entry[attr] = entry_values
self.debug('remove: updated value %s', safe_output(attr, entry_values))
elif action == 'add':
self.debug("add: '%s' to %s, current value %s", safe_output(attr, update_value), attr, safe_output(attr, entry_values))
# Remove it, ignoring errors so we can blindly add it later
try:
entry_values.remove(update_value)
except ValueError:
pass
entry_values.append(update_value)
self.debug('add: updated value %s', safe_output(attr, entry_values))
entry[attr] = entry_values
elif action == 'addifnew':
self.debug("addifnew: '%s' to %s, current value %s", safe_output(attr, update_value), attr, safe_output(attr, entry_values))
# Only add the attribute if it doesn't exist. Only works
# with single-value attributes.
if len(entry_values) == 0:
entry_values.append(update_value)
self.debug('addifnew: set %s to %s', attr, safe_output(attr, entry_values))
entry[attr] = entry_values
elif action == 'addifexist':
self.debug("addifexist: '%s' to %s, current value %s", safe_output(attr, update_value), attr, safe_output(attr, entry_values))
# Only add the attribute if the entry doesn't exist. We
# determine this based on whether it has an objectclass
if entry.get('objectclass'):
entry_values.append(update_value)
self.debug('addifexist: set %s to %s', attr, safe_output(attr, entry_values))
entry[attr] = entry_values
elif action == 'only':
self.debug("only: set %s to '%s', current value %s", attr, safe_output(attr, update_value), safe_output(attr, entry_values))
if only.get(attr):
entry_values.append(update_value)
else:
entry_values = [update_value]
only[attr] = True
entry[attr] = entry_values
self.debug('only: updated value %s', safe_output(attr, entry_values))
elif action == 'onlyifexist':
self.debug("onlyifexist: '%s' to %s, current value %s", safe_output(attr, update_value), attr, safe_output(attr, entry_values))
# Only set the attribute if the entry exist's. We
# determine this based on whether it has an objectclass
if entry.get('objectclass'):
if only.get(attr):
entry_values.append(update_value)
else:
entry_values = [update_value]
only[attr] = True
self.debug('onlyifexist: set %s to %s', attr, safe_output(attr, entry_values))
entry[attr] = entry_values
elif action == 'deleteentry':
# skip this update type, it occurs in __delete_entries()
return None
elif action == 'replace':
# value has the format "old::new"
try:
(old, new) = update_value.split('::', 1)
except ValueError:
raise BadSyntax, "bad syntax in replace, needs to be in the format old::new in %s" % update_value
return entry
def print_entity(self, e, message=None):
"""The entity object currently lacks a str() method"""
self.debug("---------------------------------------------")
if message:
self.debug("%s", message)
self.debug("dn: %s", e.dn)
for a, value in e.items():
self.debug('%s:', a)
for l in value:
self.debug("\t%s", safe_output(a, l))
def _update_record(self, update):
found = False
# If the entry is going to be deleted no point in processing it.
if update.has_key('deleteentry'):
return
new_entry = self._create_default_entry(update.get('dn'),
update.get('default'))
try:
e = self._get_entry(new_entry.dn)
if len(e) > 1:
# we should only ever get back one entry
raise BadSyntax, "More than 1 entry returned on a dn search!? %s" % new_entry.dn
entry = e[0]
found = True
self.info("Updating existing entry: %s", entry.dn)
except errors.NotFound:
# Doesn't exist, start with the default entry
entry = new_entry
self.info("New entry: %s", entry.dn)
except errors.DatabaseError:
# Doesn't exist, start with the default entry
entry = new_entry
self.info("New entry, using default value: %s", entry.dn)
self.print_entity(entry, "Initial value")
# Bring this entry up to date
entry = self._apply_update_disposition(update.get('updates'), entry)
if entry is None:
# It might be None if it is just deleting an entry
return
self.print_entity(entry, "Final value after applying updates")
added = False
updated = False
if not found:
try:
if self.live_run:
if len(entry):
# addifexist may result in an entry with only a
# dn defined. In that case there is nothing to do.
# It means the entry doesn't exist, so skip it.
try:
self.conn.add_entry(entry)
except errors.NotFound:
# parent entry of the added entry does not exist
# this may not be an error (e.g. entries in NIS container)
self.info("Parent DN of %s may not exist, cannot create the entry",
entry.dn)
return
added = True
self.modified = True
except Exception, e:
self.error("Add failure %s", e)
else:
# Update LDAP
try:
changes = entry.generate_modlist()
if len(changes) >= 1:
updated = True
safe_changes = []
for (type, attr, values) in changes:
safe_changes.append((type, attr, safe_output(attr, values)))
self.debug("%s" % safe_changes)
self.debug("Live %d, updated %d" % (self.live_run, updated))
if self.live_run and updated:
self.conn.update_entry(entry)
self.info("Done")
except errors.EmptyModlist:
self.info("Entry already up-to-date")
updated = False
except errors.DatabaseError, e:
self.error("Update failed: %s", e)
updated = False
except errors.ACIError, e:
self.error("Update failed: %s", e)
updated = False
if updated:
self.modified = True
if entry.dn.endswith(DN(('cn', 'index'), ('cn', 'userRoot'),
('cn', 'ldbm database'), ('cn', 'plugins'),
('cn', 'config'))) and (added or updated):
taskid = self.create_index_task(entry.single_value['cn'])
self.monitor_index_task(taskid)
return
def _delete_record(self, updates):
"""
Run through all the updates again looking for any that should be
deleted.
This must use a reversed list so that the longest entries are
considered first so we don't end up trying to delete a parent
and child in the wrong order.
"""
if not updates.has_key('deleteentry'):
return
dn = updates['dn']
try:
self.info("Deleting entry %s", dn)
if self.live_run:
self.conn.delete_entry(dn)
self.modified = True
except errors.NotFound, e:
self.info("%s did not exist:%s", dn, e)
self.modified = True
except errors.DatabaseError, e:
self.error("Delete failed: %s", e)
def get_all_files(self, root, recursive=False):
"""Get all update files"""
f = []
for path, subdirs, files in os.walk(root):
for name in files:
if fnmatch.fnmatch(name, "*.update"):
f.append(os.path.join(path, name))
if not recursive:
break
f.sort()
return f
def create_connection(self):
if self.online:
self.conn = connect(
ldapi=self.ldapi, realm=self.realm, fqdn=self.sub_dict['FQDN'],
dm_password=self.dm_password, pw_name=self.pw_name)
else:
raise RuntimeError("Offline updates are not supported.")
def _run_updates(self, all_updates):
# For adds and updates we want to apply updates from shortest
# to greatest length of the DN.
# For deletes we want the reverse
def update_sort_key(dn_update):
dn, update = dn_update
assert isinstance(dn, DN)
return len(dn)
sorted_updates = sorted(all_updates.iteritems(), key=update_sort_key)
for dn, update in sorted_updates:
self._update_record(update)
# Now run the deletes in reversed order
sorted_updates.reverse()
for dn, update in sorted_updates:
self._delete_record(update)
def update(self, files, ordered=False):
"""Execute the update. files is a list of the update files to use.
If ordered is True then the updates the file must be of the form
##-name.update where ## is an integer between 10 and 89. The
changes are applied to LDAP at the end of each value divisible
by 10, so after 20, 30, etc.
returns True if anything was changed, otherwise False
"""
pat = re.compile(r'(\d+)-.*\.update')
all_updates = {}
r = 20
if self.plugins:
self.info('PRE_UPDATE')
updates = api.Backend.updateclient.update(PRE_UPDATE, self.dm_password, self.ldapi, self.live_run)
self.merge_updates(all_updates, updates)
try:
self.create_connection()
if ordered and all_updates:
# flush out PRE_UPDATE plugin updates before we begin
self._run_updates(all_updates)
all_updates = {}
for f in files:
name = os.path.basename(f)
if ordered:
m = pat.match(name)
if not m:
raise RuntimeError("Filename does not match format #-name.update: %s" % f)
index = int(m.group(1))
if index < 10 or index > 90:
raise RuntimeError("Index not legal range: %d" % index)
if index >= r:
self._run_updates(all_updates)
all_updates = {}
r += 10
try:
self.info("Parsing update file '%s'" % f)
data = self.read_file(f)
except Exception, e:
self.error("error reading update file '%s'", f)
sys.exit(e)
self.parse_update_file(f, data, all_updates)
self._run_updates(all_updates)
finally:
if self.conn: self.conn.unbind()
if self.plugins:
self.info('POST_UPDATE')
all_updates = {}
updates = api.Backend.updateclient.update(POST_UPDATE, self.dm_password, self.ldapi, self.live_run)
self.merge_updates(all_updates, updates)
self._run_updates(all_updates)
return self.modified
def update_from_dict(self, updates):
"""
Apply updates internally as opposed to from a file.
updates is a dictionary containing the updates
"""
if not self.conn:
self.create_connection()
self._run_updates(updates)
return self.modified