# Authors: Simo Sorce # Alexander Bokovoy # Martin Kosek # Tomas Babej # # Copyright (C) 2007-2014 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 . ''' This module contains default Red Hat OS family-specific implementations of system tasks. ''' import os import stat import socket import sys import urllib import base64 from subprocess import CalledProcessError from nss.error import NSPRError from pyasn1.error import PyAsn1Error from ipapython.ipa_log_manager import root_logger, log_mgr from ipapython import ipautil import ipapython.errors from ipalib import x509 # FIXME: do not import from ipalib from ipaplatform.paths import paths from ipaplatform.redhat.authconfig import RedHatAuthConfig from ipaplatform.base.tasks import BaseTaskNamespace log = log_mgr.get_logger(__name__) def selinux_enabled(): """ Check if SELinux is enabled. """ if os.path.exists(paths.SELINUXENABLED): try: ipautil.run([paths.SELINUXENABLED]) return True except ipautil.CalledProcessError: # selinuxenabled returns 1 if not enabled return False else: # No selinuxenabled, no SELinux return False class RedHatTaskNamespace(BaseTaskNamespace): def restore_context(self, filepath, restorecon=paths.SBIN_RESTORECON): """ restore security context on the file path SELinux equivalent is /path/to/restorecon restorecon's return values are not reliable so we have to ignore them (BZ #739604). ipautil.run() will do the logging. """ if not selinux_enabled(): return if (os.path.exists(restorecon)): ipautil.run([restorecon, filepath], raiseonerr=False) def check_selinux_status(self, restorecon=paths.RESTORECON): """ We don't have a specific package requirement for policycoreutils which provides restorecon. This is because we don't require SELinux on client installs. However if SELinux is enabled then this package is required. This function returns nothing but may raise a Runtime exception if SELinux is enabled but restorecon is not available. """ if not selinux_enabled(): return if not os.path.exists(restorecon): raise RuntimeError('SELinux is enabled but %s does not exist.\n' 'Install the policycoreutils package and start ' 'the installation again.' % restorecon) def restore_pre_ipa_client_configuration(self, fstore, statestore, was_sssd_installed, was_sssd_configured): auth_config = RedHatAuthConfig() if statestore.has_state('authconfig'): # disable only those configurations that we enabled during install for conf in ('ldap', 'krb5', 'sssd', 'sssdauth', 'mkhomedir'): cnf = statestore.restore_state('authconfig', conf) # Do not disable sssd, as this can cause issues with its later # uses. Remove it from statestore however, so that it becomes # empty at the end of uninstall process. if cnf and conf != 'sssd': auth_config.disable(conf) else: # There was no authconfig status store # It means the code was upgraded after original install # Fall back to old logic auth_config.disable("ldap") auth_config.disable("krb5") if not(was_sssd_installed and was_sssd_configured): # Only disable sssdauth. Disabling sssd would cause issues # with its later uses. auth_config.disable("sssdauth") auth_config.disable("mkhomedir") auth_config.execute() def set_nisdomain(self, nisdomain): # Let authconfig setup the permanent configuration auth_config = RedHatAuthConfig() auth_config.add_parameter("nisdomain", nisdomain) auth_config.execute() def modify_nsswitch_pam_stack(self, sssd, mkhomedir, statestore): auth_config = RedHatAuthConfig() if sssd: statestore.backup_state('authconfig', 'sssd', True) statestore.backup_state('authconfig', 'sssdauth', True) auth_config.enable("sssd") auth_config.enable("sssdauth") else: statestore.backup_state('authconfig', 'ldap', True) auth_config.enable("ldap") auth_config.enable("forcelegacy") if mkhomedir: statestore.backup_state('authconfig', 'mkhomedir', True) auth_config.enable("mkhomedir") auth_config.execute() def modify_pam_to_use_krb5(self, statestore): auth_config = RedHatAuthConfig() statestore.backup_state('authconfig', 'krb5', True) auth_config.enable("krb5") auth_config.add_option("nostart") auth_config.execute() def reload_systemwide_ca_store(self): try: ipautil.run([paths.UPDATE_CA_TRUST]) except CalledProcessError as e: root_logger.error( "Could not update systemwide CA trust database: %s", e) return False else: root_logger.info("Systemwide CA database updated.") return True def insert_ca_certs_into_systemwide_ca_store(self, ca_certs): new_cacert_path = paths.SYSTEMWIDE_IPA_CA_CRT if os.path.exists(new_cacert_path): try: os.remove(new_cacert_path) except OSError as e: root_logger.error( "Could not remove %s: %s", new_cacert_path, e) return False new_cacert_path = paths.IPA_P11_KIT try: f = open(new_cacert_path, 'w') except IOError as e: root_logger.info("Failed to open %s: %s" % (new_cacert_path, e)) return False f.write("# This file was created by IPA. Do not edit.\n" "\n") has_eku = set() for cert, nickname, trusted, ext_key_usage in ca_certs: try: subject = x509.get_der_subject(cert, x509.DER) issuer = x509.get_der_issuer(cert, x509.DER) serial_number = x509.get_der_serial_number(cert, x509.DER) public_key_info = x509.get_der_public_key_info(cert, x509.DER) except (NSPRError, PyAsn1Error) as e: root_logger.warning( "Failed to decode certificate \"%s\": %s", nickname, e) continue label = urllib.quote(nickname) subject = urllib.quote(subject) issuer = urllib.quote(issuer) serial_number = urllib.quote(serial_number) public_key_info = urllib.quote(public_key_info) cert = base64.b64encode(cert) cert = x509.make_pem(cert) obj = ("[p11-kit-object-v1]\n" "class: certificate\n" "certificate-type: x-509\n" "certificate-category: authority\n" "label: \"%(label)s\"\n" "subject: \"%(subject)s\"\n" "issuer: \"%(issuer)s\"\n" "serial-number: \"%(serial_number)s\"\n" "x-public-key-info: \"%(public_key_info)s\"\n" % dict(label=label, subject=subject, issuer=issuer, serial_number=serial_number, public_key_info=public_key_info)) if trusted is True: obj += "trusted: true\n" elif trusted is False: obj += "x-distrusted: true\n" obj += "%s\n\n" % cert f.write(obj) if ext_key_usage is not None and public_key_info not in has_eku: if not ext_key_usage: ext_key_usage = {x509.EKU_PLACEHOLDER} try: ext_key_usage = x509.encode_ext_key_usage(ext_key_usage) except PyAsn1Error as e: root_logger.warning( "Failed to encode extended key usage for \"%s\": %s", nickname, e) continue value = urllib.quote(ext_key_usage) obj = ("[p11-kit-object-v1]\n" "class: x-certificate-extension\n" "label: \"ExtendedKeyUsage for %(label)s\"\n" "x-public-key-info: \"%(public_key_info)s\"\n" "object-id: 2.5.29.37\n" "value: \"%(value)s\"\n\n" % dict(label=label, public_key_info=public_key_info, value=value)) f.write(obj) has_eku.add(public_key_info) f.close() # Add the CA to the systemwide CA trust database if not self.reload_systemwide_ca_store(): return False return True def remove_ca_certs_from_systemwide_ca_store(self): result = True update = False # Remove CA cert from systemwide store for new_cacert_path in (paths.IPA_P11_KIT, paths.SYSTEMWIDE_IPA_CA_CRT): if not os.path.exists(new_cacert_path): continue try: os.remove(new_cacert_path) except OSError as e: root_logger.error( "Could not remove %s: %s", new_cacert_path, e) result = False else: update = True if update: if not self.reload_systemwide_ca_store(): return False return result def backup_and_replace_hostname(self, fstore, statestore, hostname): old_hostname = socket.gethostname() try: ipautil.run([paths.BIN_HOSTNAME, hostname]) except ipautil.CalledProcessError as e: print >>sys.stderr, ("Failed to set this machine hostname to " "%s (%s)." % (hostname, str(e))) filepath = paths.ETC_HOSTNAME if os.path.exists(filepath): # read old hostname with open(filepath, 'r') as f: for line in f.readlines(): line = line.strip() if not line or line.startswith('#'): # skip comment or empty line continue old_hostname = line break fstore.backup_file(filepath) with open(filepath, 'w') as f: f.write("%s\n" % hostname) os.chmod(filepath, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH) os.chown(filepath, 0, 0) self.restore_context(filepath) # store old hostname statestore.backup_state('network', 'hostname', old_hostname) def restore_network_configuration(self, fstore, statestore): old_filepath = paths.SYSCONFIG_NETWORK old_hostname = statestore.get_state('network', 'hostname') hostname_was_configured = False if fstore.has_file(old_filepath): # This is Fedora >=18 instance that was upgraded from previous # Fedora version which held network configuration # in /etc/sysconfig/network old_filepath_restore = paths.SYSCONFIG_NETWORK_IPABKP fstore.restore_file(old_filepath, old_filepath_restore) print "Deprecated configuration file '%s' was restored to '%s'" \ % (old_filepath, old_filepath_restore) hostname_was_configured = True filepath = paths.ETC_HOSTNAME if fstore.has_file(filepath): fstore.restore_file(filepath) hostname_was_configured = True if not hostname_was_configured and old_hostname: # hostname was not configured before but was set by IPA. Delete # /etc/hostname to restore previous configuration try: os.remove(filepath) except OSError: pass def set_selinux_booleans(self, required_settings, backup_func=None): def get_setsebool_args(changes): args = [paths.SETSEBOOL, "-P"] args.extend(["%s=%s" % update for update in changes.iteritems()]) return args if not selinux_enabled(): return False updated_vars = {} failed_vars = {} for setting, state in required_settings.iteritems(): if state is None: continue try: (stdout, stderr, rc) = ipautil.run([paths.GETSEBOOL, setting]) original_state = stdout.split()[2] if backup_func is not None: backup_func(setting, original_state) if original_state != state: updated_vars[setting] = state except ipautil.CalledProcessError as e: log.error("Cannot get SELinux boolean '%s': %s", setting, e) failed_vars[setting] = state if updated_vars: args = get_setsebool_args(updated_vars) try: ipautil.run(args) except ipautil.CalledProcessError: failed_vars.update(updated_vars) if failed_vars: raise ipapython.errors.SetseboolError( failed=failed_vars, command=' '.join(get_setsebool_args(failed_vars))) return True def create_system_user(self, name, group, homedir, shell, uid = None, gid = None, comment = None): """ Create a system user with a corresponding group According to https://fedoraproject.org/wiki/Packaging:UsersAndGroups?rd=Packaging/UsersAndGroups#Soft_static_allocation some system users should have fixed UID, GID and other parameters set. This values should be constant and may be hardcoded. Add other values for other users when needed. """ if name == 'pkiuser': if uid is None: uid = 17 if gid is None: gid = 17 if comment is None: comment = 'CA System User' if name == 'dirsrv': if comment is None: comment = 'DS System User' super(RedHatTaskNamespace, self).create_system_user(name, group, homedir, shell, uid, gid, comment) tasks = RedHatTaskNamespace()