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ae2d5edd1a
Also make sure all exceptions are captured when creating CIFS service record. The one we care about is duplicate entry and we do nothing in that case anyway. Also make uniform use of action descriptors.
472 lines
17 KiB
Python
472 lines
17 KiB
Python
# Authors: Sumit Bose <sbose@redhat.com>
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#
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# Copyright (C) 2011 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import errno
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import ldap
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import tempfile
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import uuid
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from ipaserver import ipaldap
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from ipaserver.install import installutils
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from ipaserver.install import service
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from ipaserver.install.dsinstance import realm_to_serverid
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from ipaserver.install.bindinstance import get_rr, add_rr, del_rr, \
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dns_zone_exists
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from ipalib import errors, api
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from ipapython import sysrestore
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from ipapython import ipautil
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from ipapython.ipa_log_manager import *
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from ipapython import services as ipaservices
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import string
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import struct
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ALLOWED_NETBIOS_CHARS = string.ascii_uppercase + string.digits
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def check_inst():
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for smbfile in ['/usr/sbin/smbd', '/usr/bin/net', '/usr/bin/smbpasswd']:
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if not os.path.exists(smbfile):
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print "%s was not found on this system" % file
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print "Please install the 'samba' packages and " \
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"start the installation again"
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return False
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#TODO: Add check for needed samba4 libraries
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return True
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def ipa_smb_conf_exists():
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try:
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conf_fd = open('/etc/samba/smb.conf', 'r')
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except IOError, err:
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if err.errno == errno.ENOENT:
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return False
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lines = conf_fd.readlines()
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conf_fd.close()
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for line in lines:
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if line.startswith('### Added by IPA Installer ###'):
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return True
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return False
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def check_netbios_name(s):
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# NetBIOS names may not be longer than 15 allowed characters
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if not s or len(s) > 15 or \
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''.join([c for c in s if c not in ALLOWED_NETBIOS_CHARS]):
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return False
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return True
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def make_netbios_name(s):
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return ''.join([c for c in s.split('.')[0].upper() \
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if c in ALLOWED_NETBIOS_CHARS])[:15]
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class ADTRUSTInstance(service.Service):
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ATTR_SID = "ipaNTSecurityIdentifier"
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ATTR_FLAT_NAME = "ipaNTFlatName"
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ATTR_GUID = "ipaNTDomainGUID"
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OBJC_USER = "ipaNTUserAttrs"
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OBJC_GROUP = "ipaNTGroupAttrs"
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OBJC_DOMAIN = "ipaNTDomainAttrs"
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def __init__(self, fstore=None, dm_password=None):
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self.fqdn = None
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self.ip_address = None
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self.realm_name = None
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self.domain_name = None
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self.netbios_name = None
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self.no_msdcs = None
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self.smbd_user = None
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self.suffix = None
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self.ldapi_socket = None
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self.smb_conf = None
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self.smb_dn = None
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self.smb_dn_pwd = None
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self.trust_dn = None
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self.smb_dom_dn = None
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self.sub_dict = None
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service.Service.__init__(self, "smb", dm_password=dm_password)
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if fstore:
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self.fstore = fstore
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else:
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self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore')
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def __create_samba_user(self):
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print "The user for Samba is %s" % self.smb_dn
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try:
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self.admin_conn.getEntry(self.smb_dn, ldap.SCOPE_BASE)
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root_logger.info("Samba user entry exists, resetting password")
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self.admin_conn.modify_s(self.smb_dn, \
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[(ldap.MOD_REPLACE, "userPassword", self.smb_dn_pwd)])
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return
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except errors.NotFound:
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pass
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# The user doesn't exist, add it
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entry = ipaldap.Entry(self.smb_dn)
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entry.setValues("objectclass", ["account", "simplesecurityobject"])
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entry.setValues("uid", "samba")
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entry.setValues("userPassword", self.smb_dn_pwd)
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self.admin_conn.addEntry(entry)
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# And finally grant it permission to read NT passwords, we do not want
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# to support LM passwords so there is no need to allow access to them.
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# Also the premission to create trusted domain objects below the
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# domain object is granted.
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mod = [(ldap.MOD_ADD, 'aci',
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str('(targetattr = "ipaNTHash")' \
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'(version 3.0; acl "Samba user can read NT passwords";' \
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'allow (read) userdn="ldap:///%s";)' % self.smb_dn)),
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(ldap.MOD_ADD, 'aci',
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str('(target = "ldap:///cn=ad,cn=trusts,%s")' \
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'(targetattr = "ipaNTTrustType || ipaNTTrustAttributes || ' \
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'ipaNTTrustDirection || ' \
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'ipaNTTrustPartner || ipaNTFlatName || ' \
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'ipaNTTrustAuthOutgoing || ' \
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'ipaNTTrustAuthIncoming || ' \
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'ipaNTSecurityIdentifier || ' \
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'ipaNTTrustForestTrustInfo || ' \
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'ipaNTTrustPosixOffset || ' \
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'ipaNTSupportedEncryptionTypes")' \
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'(version 3.0;acl "Allow samba user to create and delete ' \
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'trust accounts";' \
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'allow (write,add,delete) userdn = "ldap:///%s";)' % \
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(self.suffix, self.smb_dn)))]
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try:
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self.admin_conn.modify_s(self.suffix, mod)
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except ldap.TYPE_OR_VALUE_EXISTS:
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root_logger.debug("samba user aci already exists in suffix %s on %s" % (self.suffix, self.admin_conn.host))
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def __gen_sid_string(self):
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sub_ids = struct.unpack("<LLL", os.urandom(12))
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return "S-1-5-21-%d-%d-%d" % (sub_ids[0], sub_ids[1], sub_ids[2])
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def __add_admin_sids(self):
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admin_dn = "uid=admin,cn=users,cn=accounts,%s" % self.suffix
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admin_group_dn = "cn=admins,cn=groups,cn=accounts,%s" % self.suffix
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try:
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dom_entry = self.admin_conn.getEntry(self.smb_dom_dn, \
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ldap.SCOPE_BASE)
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except errors.NotFound:
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print "Samba domain object not found"
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return
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dom_sid = dom_entry.getValue(self.ATTR_SID)
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if not dom_sid:
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print "Samba domain object does not have a SID"
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return
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try:
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admin_entry = self.admin_conn.getEntry(admin_dn, ldap.SCOPE_BASE)
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except:
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print "IPA admin object not found"
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return
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try:
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admin_group_entry = self.admin_conn.getEntry(admin_group_dn, \
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ldap.SCOPE_BASE)
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except:
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print "IPA admin group object not found"
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return
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if admin_entry.getValue(self.ATTR_SID) or \
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admin_group_entry.getValue(self.ATTR_SID):
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print "Admin SID already set, nothing to do"
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return
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try:
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self.admin_conn.modify_s(admin_dn, \
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[(ldap.MOD_ADD, "objectclass", self.OBJC_USER), \
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(ldap.MOD_ADD, self.ATTR_SID, dom_sid + "-500")])
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except:
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print "Failed to modify IPA admin object"
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try:
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self.admin_conn.modify_s(admin_group_dn, \
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[(ldap.MOD_ADD, "objectclass", self.OBJC_GROUP), \
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(ldap.MOD_ADD, self.ATTR_SID, dom_sid + "-512")])
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except:
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print "Failed to modify IPA admin group object"
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def __create_samba_domain_object(self):
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try:
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self.admin_conn.getEntry(self.smb_dom_dn, ldap.SCOPE_BASE)
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root_logger.info("Samba domain object already exists")
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return
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except errors.NotFound:
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pass
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for new_dn in (self.trust_dn, \
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"cn=ad,"+self.trust_dn, \
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"cn=ad,cn=etc,"+self.suffix):
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try:
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self.admin_conn.getEntry(new_dn, ldap.SCOPE_BASE)
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except errors.NotFound:
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entry = ipaldap.Entry(new_dn)
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entry.setValues("objectclass", ["nsContainer"])
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name = new_dn.split('=')[1].split(',')[0]
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if not name:
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print "Cannot extract RDN attribute value from [%s]" % \
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new_dn
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return
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entry.setValues("cn", name)
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self.admin_conn.addEntry(entry)
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entry = ipaldap.Entry(self.smb_dom_dn)
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entry.setValues("objectclass", [self.OBJC_DOMAIN, "nsContainer"])
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entry.setValues("cn", self.domain_name)
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entry.setValues(self.ATTR_FLAT_NAME, self.netbios_name)
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entry.setValues(self.ATTR_SID, self.__gen_sid_string())
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entry.setValues(self.ATTR_GUID, str(uuid.uuid4()))
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#TODO: which MAY attributes do we want to set ?
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self.admin_conn.addEntry(entry)
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def __write_smb_conf(self):
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self.fstore.backup_file(self.smb_conf)
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conf_fd = open(self.smb_conf, "w")
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conf_fd.write('### Added by IPA Installer ###\n')
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conf_fd.write('[global]\n')
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conf_fd.write('config backend = registry\n')
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conf_fd.close()
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def __add_cldap_module(self):
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try:
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self._ldap_mod("ipa-cldap-conf.ldif", self.sub_dict)
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except:
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pass
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def __write_smb_registry(self):
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template = os.path.join(ipautil.SHARE_DIR, "smb.conf.template")
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conf = ipautil.template_file(template, self.sub_dict)
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[tmp_fd, tmp_name] = tempfile.mkstemp()
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os.write(tmp_fd, conf)
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os.close(tmp_fd)
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args = ["/usr/bin/net", "conf", "import", tmp_name]
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try:
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ipautil.run(args)
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finally:
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os.remove(tmp_name)
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def __set_smb_ldap_password(self):
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args = ["/usr/bin/smbpasswd", "-c", self.smb_conf, "-s", "-W" ]
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ipautil.run(args, stdin = self.smb_dn_pwd + "\n" + \
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self.smb_dn_pwd + "\n" )
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def __setup_principal(self):
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cifs_principal = "cifs/" + self.fqdn + "@" + self.realm_name
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try:
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api.Command.service_add(unicode(cifs_principal))
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except Exception, e:
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# CIFS principal already exists, it is not the first time adtrustinstance is managed
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# That's fine, we we'll re-extract the key again.
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pass
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samba_keytab = "/etc/samba/samba.keytab"
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if os.path.exists(samba_keytab):
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try:
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ipautil.run(["ipa-rmkeytab", "--principal", cifs_principal,
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"-k", samba_keytab])
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except ipautil.CalledProcessError, e:
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if e.returncode != 5:
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root_logger.critical("Failed to remove old key for %s" % cifs_principal)
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try:
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ipautil.run(["ipa-getkeytab", "--server", self.fqdn,
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"--principal", cifs_principal,
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"-k", samba_keytab])
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except ipautil.CalledProcessError, e:
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root_logger.critical("Failed to add key for %s" % cifs_principal)
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def __add_dns_service_records(self):
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"""
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Add DNS service records for Windows if DNS is enabled and the DNS zone
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is managed. If there are already service records for LDAP and Kerberos
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their values are used. Otherwise default values are used.
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"""
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zone = self.domain_name
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host = self.fqdn.split(".")[0]
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ipa_srv_rec = (
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("_ldap._tcp", ["0 100 389 %s" % host]),
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("_kerberos._tcp", ["0 100 88 %s" % host]),
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("_kerberos._udp", ["0 100 88 %s" % host])
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)
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win_srv_suffix = (".Default-First-Site-Name._sites.dc._msdcs",
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".dc._msdcs")
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err_msg = None
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ret = api.Command['dns_is_enabled']()
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if not ret['result']:
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err_msg = "DNS management was not enabled at install time."
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else:
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if not dns_zone_exists(zone):
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err_msg = "DNS zone %s cannot be managed " \
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"as it is not defined in IPA" % zone
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if err_msg:
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print err_msg
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print "Add the following service records to your DNS server " \
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"for DNS zone %s: " % zone
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for (srv, rdata) in ipa_srv_rec:
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for suff in win_srv_suffix:
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print " - %s%s" % (srv, suff)
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return
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for (srv, rdata) in ipa_srv_rec:
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ipa_rdata = get_rr(zone, srv, "SRV")
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if not ipa_rdata:
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ipa_rdata = rdata
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for suff in win_srv_suffix:
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win_srv = srv+suff
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win_rdata = get_rr(zone, win_srv, "SRV")
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if win_rdata:
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for rec in win_rdata:
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del_rr(zone, win_srv, "SRV", rec)
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for rec in ipa_rdata:
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add_rr(zone, win_srv, "SRV", rec)
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def __start(self):
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try:
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self.start()
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except:
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root_logger.critical("smbd service failed to start")
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def __stop(self):
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self.backup_state("running", self.is_running())
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try:
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self.stop()
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except:
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pass
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def __restart_kdc(self):
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try:
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ipaservices.knownservices.krb5kdc.restart()
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except:
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pass
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def __enable(self):
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self.backup_state("enabled", self.is_enabled())
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# We do not let the system start IPA components on its own,
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# Instead we reply on the IPA init script to start only enabled
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# components as found in our LDAP configuration tree
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try:
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self.ldap_enable('ADTRUST', self.fqdn, self.dm_password, \
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self.suffix)
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except (ldap.ALREADY_EXISTS, errors.DuplicateEntry), e:
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root_logger.info("ADTRUST Service startup entry already exists.")
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pass
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def __setup_sub_dict(self):
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self.sub_dict = dict(REALM = self.realm_name,
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SUFFIX = self.suffix,
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NETBIOS_NAME = self.netbios_name,
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SMB_DN = self.smb_dn,
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LDAPI_SOCKET = self.ldapi_socket)
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def setup(self, fqdn, ip_address, realm_name, domain_name, netbios_name,
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no_msdcs=False, smbd_user="samba"):
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self.fqdn = fqdn
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self.ip_address = ip_address
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self.realm_name = realm_name
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self.domain_name = domain_name
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self.netbios_name = netbios_name
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self.no_msdcs = no_msdcs
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self.smbd_user = smbd_user
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self.suffix = ipautil.realm_to_suffix(self.realm_name)
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self.ldapi_socket = "%%2fvar%%2frun%%2fslapd-%s.socket" % \
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realm_to_serverid(self.realm_name)
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self.smb_conf = "/etc/samba/smb.conf"
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self.smb_dn = "uid=samba,cn=sysaccounts,cn=etc,%s" % self.suffix
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self.smb_dn_pwd = ipautil.ipa_generate_password()
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self.trust_dn = "cn=trusts,%s" % self.suffix
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self.smb_dom_dn = "cn=%s,cn=ad,cn=etc,%s" % (self.domain_name, \
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self.suffix)
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self.__setup_sub_dict()
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def create_instance(self):
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self.ldap_connect()
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self.step("stopping smbd", self.__stop)
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self.step("creating samba user", self.__create_samba_user)
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self.step("creating samba domain object", \
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self.__create_samba_domain_object)
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self.step("creating samba config registry", self.__write_smb_registry)
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self.step("writing samba config file", self.__write_smb_conf)
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self.step("setting password for the samba user", \
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self.__set_smb_ldap_password)
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self.step("adding cifs Kerberos principal", self.__setup_principal)
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self.step("adding admin(group) SIDs", self.__add_admin_sids)
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self.step("activating CLDAP plugin", self.__add_cldap_module)
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self.step("configuring smbd to start on boot", self.__enable)
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if not self.no_msdcs:
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self.step("adding special DNS service records", \
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self.__add_dns_service_records)
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self.step("restarting KDC to take MS PAC changes into account", \
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self.__restart_kdc)
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self.step("starting smbd", self.__start)
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self.start_creation("Configuring smbd:")
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def uninstall(self):
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if self.is_configured():
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self.print_msg("Unconfiguring %s" % self.service_name)
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running = self.restore_state("running")
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enabled = self.restore_state("enabled")
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try:
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self.stop()
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except:
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pass
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for r_file in [self.smb_conf]:
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try:
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self.fstore.restore_file(r_file)
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except ValueError, error:
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root_logger.debug(error)
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pass
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if not enabled is None and not enabled:
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self.disable()
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if not running is None and running:
|
|
self.start()
|