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BareosFdPluginLDAP.py
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BareosFdPluginLDAP.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# BAREOS - Backup Archiving REcovery Open Sourced
#
# Copyright (C) 2015-2015 Planets Communications B.V.
# Copyright (C) 2015-2015 Bareos GmbH & Co. KG
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of version three of the GNU Affero General Public
# License as published by the Free Software Foundation, which is
# listed in the file LICENSE.
#
# 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
# Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
# Author: Marco van Wieringen
#
# Bareos python class for LDAP related backup and restore
#
import bareosfd
from bareos_fd_consts import bJobMessageType, bFileType, bRCs, bIOPS
from bareos_fd_consts import bCFs
import BareosFdPluginBaseclass
from StringIO import StringIO
from stat import S_IFREG, S_IFDIR, S_IRWXU
import io
import ldif
import ldap
import ldap.resiter
import ldap.modlist
import time
from calendar import timegm
class BareosFdPluginLDAP(BareosFdPluginBaseclass.BareosFdPluginBaseclass):
"""
LDAP related backup and restore stuff
"""
def __init__(self, context, plugindef):
bareosfd.DebugMessage(
context,
100,
"Constructor called in module %s with plugindef=%s\n"
% (__name__, plugindef),
)
super(BareosFdPluginLDAP, self).__init__(context, plugindef, ["uri", "basedn"])
self.ldap = BareosLDAPWrapper()
self.data_stream = None
def parse_plugin_definition(self, context, plugindef):
"""
Parses the plugin arguments and validates the options.
"""
bareosfd.DebugMessage(
context,
100,
"parse_plugin_definition() was called in module %s\n" % (__name__),
)
super(BareosFdPluginLDAP, self).parse_plugin_definition(context, plugindef)
return bRCs["bRC_OK"]
def start_backup_job(self, context):
"""
Start of Backup Job
"""
check_option_bRC = self.check_options(context)
if check_option_bRC != bRCs["bRC_OK"]:
return check_option_bRC
return self.ldap.prepare_backup(context, self.options)
def start_backup_file(self, context, savepkt):
"""
Defines the file to backup and creates the savepkt.
"""
bareosfd.DebugMessage(
context, 100, "BareosFdPluginLDAP:start_backup_file() called\n"
)
return self.ldap.get_next_file_to_backup(context, savepkt)
def start_restore_job(self, context):
"""
Start of Restore Job
"""
check_option_bRC = self.check_options(context)
if check_option_bRC != bRCs["bRC_OK"]:
return check_option_bRC
return self.ldap.prepare_restore(context, self.options)
def start_restore_file(self, context, cmd):
bareosfd.DebugMessage(
context,
100,
"BareosFdPluginLDAP:start_restore_file() called with %s\n" % (cmd),
)
# It can happen that this is the first entry point on a restore
# and we missed the bEventStartRestoreJob event because we registerd
# that event after it aready fired. If that is true self.ldap.ld will
# not be set and we call start_restore_job() from here.
if not self.ldap.ld:
return self.start_restore_job(context)
else:
return bRCs["bRC_OK"]
def create_file(self, context, restorepkt):
"""
Directories are placeholders only we use the data.ldif files
to get the actual DN of the LDAP record
"""
bareosfd.DebugMessage(
context,
100,
"BareosFdPluginLDAP:create_file() called with %s\n" % (restorepkt),
)
if restorepkt.type == bFileType["FT_DIREND"]:
restorepkt.create_status = bCFs["CF_SKIP"]
elif restorepkt.type == bFileType["FT_REG"]:
self.ldap.set_new_dn(restorepkt.ofname)
restorepkt.create_status = bCFs["CF_EXTRACT"]
else:
bareosfd.JobMessage(
context,
bJobMessageType["M_FATAL"],
"Request to restore illegal filetype %s\n" % (restorepkt.type),
)
return bRCs["bRC_Error"]
return bRCs["bRC_OK"]
def plugin_io(self, context, IOP):
bareosfd.DebugMessage(
context,
100,
"BareosFdPluginLDAP:plugin_io() called with function %s\n" % (IOP.func),
)
if IOP.func == bIOPS["IO_OPEN"]:
self.last_op = IOP.func
return bRCs["bRC_OK"]
elif IOP.func == bIOPS["IO_CLOSE"]:
if self.last_op == bIOPS["IO_OPEN"]:
bareosfd.JobMessage(
context,
bJobMessageType["M_WARNING"],
"Missing data for DN %s\n" % self.ldap.dn)
self.last_op = IOP.func
return bRCs["bRC_OK"]
elif IOP.func == bIOPS["IO_SEEK"]:
self.last_op = IOP.func
return bRCs["bRC_OK"]
elif IOP.func == bIOPS["IO_READ"]:
if not self.data_stream:
self.data_stream = io.BytesIO(self.ldap.ldif)
IOP.buf = bytearray(IOP.count)
IOP.status = self.data_stream.readinto(IOP.buf)
if IOP.status == 0:
self.data_stream = None
self.ldap.ldif = None
IOP.io_errno = 0
self.last_op = IOP.func
return bRCs["bRC_OK"]
elif IOP.func == bIOPS["IO_WRITE"]:
if not self.data_stream:
self.data_stream = io.BytesIO()
IOP.status = self.data_stream.write(IOP.buf)
IOP.io_errno = 0
self.last_op = IOP.func
return bRCs["bRC_OK"]
def end_backup_file(self, context):
bareosfd.DebugMessage(
context, 100, "BareosFdPluginLDAP:end_backup_file() called\n"
)
return self.ldap.has_next_file(context)
def end_restore_file(self, context):
bareosfd.DebugMessage(
context, 100, "BareosFdPluginLDAP:end_restore_file() called\n"
)
if self.data_stream is not None:
self.ldap.ldif = self.data_stream.getvalue().decode("ascii")
self.ldap.ldif_len = len(self.ldap.ldif)
self.data_stream = None
return self.ldap.restore_entry(context)
# Overload ldap class and ldap.resiter class for bulk retrieval
class BulkLDAP(ldap.ldapobject.LDAPObject, ldap.resiter.ResultProcessor):
pass
class BareosLDAPWrapper:
"""
LDAP specific class.
"""
def __init__(self):
self.ld = None
self.resultset = None
self.ldap_entries = None
self.file_to_backup = None
self.dn = None
self.entry = None
self.ldif = None
self.ldif_len = None
self.unix_create_time = None
self.unix_modify_time = None
self.msg_id = None
def connect_and_bind(self, context, options, bulk=False):
"""
Bind to LDAP URI using the given authentication tokens
"""
if bulk:
self.ld = BulkLDAP(options["uri"])
else:
self.ld = ldap.initialize(options["uri"])
try:
self.ld.protocol_version = ldap.VERSION3
if "bind_dn" in options and "password" in options:
self.ld.simple_bind_s(options["bind_dn"], options["password"])
else:
self.ld.simple_bind_s("", "")
except ldap.INVALID_CREDENTIALS:
bareosfd.JobMessage(
context,
bJobMessageType["M_FATAL"],
"Failed to bind to LDAP uri %s\n" % (options["uri"]),
)
return bRCs["bRC_Error"]
except ldap.LDAPError as e:
if type(e.message) == dict and "desc" in e.message:
bareosfd.JobMessage(
context,
bJobMessageType["M_FATAL"],
"Failed to bind to LDAP uri %s: %s\n"
% (options["uri"], e.message["desc"]),
)
else:
bareosfd.JobMessage(
context,
bJobMessageType["M_FATAL"],
"Failed to bind to LDAP uri %s: %s\n" % (options["uri"], e),
)
return bRCs["bRC_Error"]
bareosfd.DebugMessage(context, 100, "connected to LDAP server\n")
return bRCs["bRC_OK"]
def prepare_backup(self, context, options):
"""
Prepare a LDAP backup
"""
connect_bRC = self.connect_and_bind(context, options, True)
if connect_bRC != bRCs["bRC_OK"]:
return connect_bRC
bareosfd.DebugMessage(
context,
100,
"Creating search filter and attribute filter to perform LDAP search\n",
)
# Get a subtree
searchScope = ldap.SCOPE_SUBTREE
# See if there is a specific search filter otherwise use the all object filter.
if "search_filter" in options:
searchFilter = options["search_filter"]
else:
searchFilter = r"(objectclass=*)"
# Get all user attributes and createTimestamp + modifyTimestamp
attributeFilter = ["*", "createTimestamp", "modifyTimestamp"]
try:
# Asynchronous search method
self.msg_id = self.ld.search(
options["basedn"], searchScope, searchFilter, attributeFilter
)
except ldap.LDAPError as e:
if type(e.message) == dict and "desc" in e.message:
bareosfd.JobMessage(
context,
bJobMessageType["M_FATAL"],
"Failed to execute LDAP search on LDAP uri %s: %s\n"
% (options["uri"], e.message["desc"]),
)
else:
bareosfd.JobMessage(
context,
bJobMessageType["M_FATAL"],
"Failed to execute LDAP search on LDAP uri %s: %s\n"
% (options["uri"], e),
)
return bRCs["bRC_Error"]
bareosfd.DebugMessage(context, 100, "Successfully performed LDAP search\n")
return bRCs["bRC_OK"]
def prepare_restore(self, context, options):
"""
Prepare a LDAP restore
"""
connect_bRC = self.connect_and_bind(context, options)
if connect_bRC != bRCs["bRC_OK"]:
return connect_bRC
return bRCs["bRC_OK"]
def to_unix_timestamp(self, context, timestamp):
if timestamp:
unix_time = timegm(
time.strptime(timestamp.replace("Z", "GMT"), "%Y%m%d%H%M%S%Z")
)
return int(unix_time)
else:
return None
def get_next_file_to_backup(self, context, savepkt):
"""
Find out the next file that should be backed up
"""
# When file_to_backup is not None we should return the LDIF.
if self.file_to_backup:
# Remove some attributes from entry before creating the LDIF.
ignore_attribute = ["createTimestamp", "modifyTimestamp"]
keys = self.entry.keys()
for value in keys:
if value in ignore_attribute:
del self.entry[value]
# Dump the content of the LDAP entry as LDIF text
ldif_dump = StringIO()
ldif_out = ldif.LDIFWriter(ldif_dump)
ldif_out.unparse(self.dn, self.entry)
self.ldif = ldif_dump.getvalue()
self.ldif_len = len(self.ldif)
ldif_dump.close()
statp = bareosfd.StatPacket()
statp.mode = S_IRWXU | S_IFREG
statp.size = self.ldif_len
if self.unix_create_time:
statp.ctime = self.unix_create_time
if self.unix_modify_time:
statp.mtime = self.unix_modify_time
savepkt.statp = statp
savepkt.type = bFileType["FT_REG"]
savepkt.fname = self.file_to_backup + "/data.ldif"
# Read the content of a file
savepkt.no_read = False
# On next run we need to get next entry from result set.
self.file_to_backup = None
else:
# If we have no result set get what the LDAP search returned as resultset.
if self.resultset is None:
self.resultset = self.ld.allresults(self.msg_id)
# Try to get the first result set from the query,
# if there is nothing return an error.
try:
res_type, res_data, res_msgid, res_controls = self.resultset.next()
self.ldap_entries = res_data
except ldap.NO_SUCH_OBJECT:
return bRCs["bRC_Error"]
except StopIteration:
return bRCs["bRC_Error"]
# Get the next entry from the result set.
if self.ldap_entries:
self.dn, self.entry = self.ldap_entries.pop(0)
if self.dn:
# Extract the createTimestamp and modifyTimestamp and
# convert it to an UNIX timestamp
self.unix_create_time = None
try:
createTimestamp = self.entry["createTimestamp"][0]
except KeyError:
pass
else:
self.unix_create_time = self.to_unix_timestamp(
context, createTimestamp
)
self.unix_modify_time = None
try:
modifyTimestamp = self.entry["modifyTimestamp"][0]
except KeyError:
pass
else:
self.unix_modify_time = self.to_unix_timestamp(
context, modifyTimestamp
)
# Convert the DN into a PATH e.g. reverse the elements.
dn_sliced = self.dn.split(",")
self.file_to_backup = "@LDAP" + "".join(
["/" + element for element in reversed(dn_sliced)]
)
statp = bareosfd.StatPacket()
statp.mode = S_IRWXU | S_IFDIR
if self.unix_create_time:
statp.ctime = self.unix_create_time
if self.unix_modify_time:
statp.mtime = self.unix_modify_time
savepkt.statp = statp
savepkt.type = bFileType["FT_DIREND"]
savepkt.fname = self.file_to_backup
# A directory has a link field which contains the fname + a trailing '/'
savepkt.link = self.file_to_backup + "/"
# Don't read the content of a directory
savepkt.no_read = True
return bRCs["bRC_OK"]
def set_new_dn(self, fname):
"""
Generate a LDAP DN based on provided filename and path.
1. split filename into path components
2. reverse the list
3. filter out anything without an equals sign("=")
4. join components into comma-separated string
"""
self.dn = ",".join(filter(lambda x: "=" in x, reversed(fname.split("/"))))
def has_next_file(self, context):
# See if we are currently handling the LDIF file or
# if there is still data in the result set
if self.file_to_backup or self.ldap_entries:
bareosfd.DebugMessage(context, 100, "has_next_file(): returning bRC_More\n")
return bRCs["bRC_More"]
else:
# See if there are more result sets.
if self.resultset:
try:
# Get the next result set
res_type, res_data, res_msgid, res_controls = self.resultset.next()
self.ldap_entries = res_data
# We expect something to be in the result set but better check
if self.ldap_entries:
bareosfd.DebugMessage(
context, 100, "has_next_file(): returning bRC_More\n"
)
return bRCs["bRC_More"]
except StopIteration:
pass
return bRCs["bRC_OK"]
def restore_entry(self, context):
# Restore the entry
if self.ldif:
# Parse the LDIF back to an attribute list
ldif_dump = StringIO(str(self.ldif))
ldif_parser = ldif.LDIFRecordList(ldif_dump, max_entries=1)
ldif_parser.parse()
dn, entry = ldif_parser.all_records[0]
ldif_dump.close()
if self.dn != dn:
bareosfd.JobMessage(
context,
bJobMessageType["M_INFO"],
"Restoring original DN %s as %s\n" % (dn, self.dn),
)
if dn:
if self.ld:
# Try adding the entry
add_ldif = ldap.modlist.addModlist(entry)
try:
self.ld.add_s(self.dn, add_ldif)
except ldap.LDAPError as e:
# Delete the original DN
try:
self.ld.delete_s(self.dn)
self.ld.add_s(self.dn, add_ldif)
except ldap.LDAPError as e:
if type(e.message) == dict and "desc" in e.message:
bareosfd.JobMessage(
context,
bJobMessageType["M_ERROR"],
"Failed to restore LDAP DN %s: %s\n"
% (self.dn, e.message["desc"]),
)
else:
bareosfd.JobMessage(
context,
bJobMessageType["M_ERROR"],
"Failed to restore LDAP DN %s: %s\n" % (self.dn, e),
)
self.ldif = None
return bRCs["bRC_Error"]
else:
bareosfd.JobMessage(
context,
bJobMessageType["M_ERROR"],
"Failed to restore LDAP DN %s no writable binding to LDAP exists\n"
% (self.dn),
)
self.ldif = None
return bRCs["bRC_Error"]
# Processed ldif
self.ldif = None
return bRCs["bRC_OK"]
def cleanup(self, context):
if self.ld:
self.ld.unbind_s()
return bRCs["bRC_OK"]
# vim: ts=4 tabstop=4 expandtab shiftwidth=4 softtabstop=4