freeipa/ipaserver/install/installutils.py
Florence Blanc-Renaud 2011d1a36a pylint: disable used-before-assignment
Related: https://pagure.io/freeipa/issue/9278

Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Stanislav Levin <slev@altlinux.org>
2023-01-10 08:30:58 +01:00

1597 lines
53 KiB
Python

# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007 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/>.
#
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import logging
import socket
import getpass
import gssapi
import ldif
import os
import re
import fileinput
import sys
import tempfile
import shutil
import traceback
import textwrap
import warnings
from contextlib import contextmanager
from configparser import ConfigParser as SafeConfigParser
from configparser import NoOptionError
from dns import rrset, rdatatype, rdataclass
from dns.exception import DNSException
import ldap
import six
from ipalib import facts
from ipalib.install.kinit import kinit_password
import ipaplatform
from ipapython import ipautil, admintool, version, ipaldap
from ipapython.admintool import ScriptError, SERVER_NOT_CONFIGURED # noqa: E402
from ipapython.certdb import EXTERNAL_CA_TRUST_FLAGS
from ipalib.constants import FQDN, MAXHOSTNAMELEN
from ipalib.util import validate_hostname
from ipalib import api, errors, x509
from ipalib.install import dnsforwarders
from ipapython.dn import DN
from ipapython.dnsutil import DNSName, resolve
from ipaserver.install import certs, service, sysupgrade
from ipaplatform import services
from ipaplatform.paths import paths
from ipaplatform.tasks import tasks
if six.PY3:
unicode = str
logger = logging.getLogger(__name__)
class BadHostError(Exception):
pass
class HostLookupError(BadHostError):
pass
class HostForwardLookupError(HostLookupError):
pass
class HostReverseLookupError(HostLookupError):
pass
class HostnameLocalhost(HostLookupError):
pass
class UpgradeVersionError(Exception):
pass
class UpgradePlatformError(UpgradeVersionError):
pass
class UpgradeDataOlderVersionError(UpgradeVersionError):
pass
class UpgradeDataNewerVersionError(UpgradeVersionError):
pass
class UpgradeMissingVersionError(UpgradeVersionError):
pass
class ReplicaConfig:
def __init__(self, top_dir=None):
self.realm_name = ""
self.domain_name = ""
self.master_host_name = ""
self.dirman_password = ""
self.host_name = ""
self.dir = ""
self.subject_base = None
self.setup_ca = False
self.version = 0
self.top_dir = top_dir
subject_base = ipautil.dn_attribute_property('_subject_base')
def get_fqdn():
"""Get fully qualified domain name of current host
:note: used by ansible_freeipa
:deprecated: use ipalib.constants.FQDN
:return: str
"""
return FQDN
def verify_fqdn(host_name, no_host_dns=False, local_hostname=True):
"""
Run fqdn checks for given host:
- test hostname format
- test that hostname is fully qualified
- test forward and reverse hostname DNS lookup
Raises `BadHostError` or derived Exceptions if there is an error
:param host_name: The host name to verify.
:param no_host_dns: If true, skip DNS resolution tests of the host name.
:param local_hostname: If true, run additional checks for local hostnames
"""
if len(host_name.split(".")) < 2 or host_name == "localhost.localdomain":
raise BadHostError("Invalid hostname '%s', must be fully-qualified." % host_name)
if host_name != host_name.lower():
raise BadHostError("Invalid hostname '%s', must be lower-case." % host_name)
if ipautil.valid_ip(host_name):
raise BadHostError("IP address not allowed as a hostname")
try:
# make sure that the host name meets the requirements in ipalib
validate_hostname(host_name, maxlen=MAXHOSTNAMELEN)
except ValueError as e:
raise BadHostError("Invalid hostname '%s', %s" % (host_name, unicode(e)))
if local_hostname:
try:
logger.debug('Check if %s is a primary hostname for localhost',
host_name)
ex_name = socket.gethostbyaddr(host_name)
logger.debug('Primary hostname for localhost: %s', ex_name[0])
if host_name != ex_name[0]:
raise HostLookupError("The host name %s does not match the primary host name %s. "\
"Please check /etc/hosts or DNS name resolution" % (host_name, ex_name[0]))
except socket.gaierror:
pass
except socket.error as e:
logger.debug(
'socket.gethostbyaddr() error: %d: %s',
e.errno, e.strerror)
if no_host_dns:
print("Warning: skipping DNS resolution of host", host_name)
return
try:
logger.debug('Search DNS for %s', host_name)
hostaddr = socket.getaddrinfo(host_name, None)
except Exception as e:
logger.debug('Search failed: %s', e)
raise HostForwardLookupError("Unable to resolve host name, check /etc/hosts or DNS name resolution")
if len(hostaddr) == 0:
raise HostForwardLookupError("Unable to resolve host name, check /etc/hosts or DNS name resolution")
# Verify this is NOT a CNAME
try:
logger.debug('Check if %s is not a CNAME', host_name)
resolve(host_name, rdatatype.CNAME)
raise HostReverseLookupError("The IPA Server Hostname cannot be a CNAME, only A and AAAA names are allowed.")
except DNSException:
pass
# list of verified addresses to prevent multiple searches for the same address
verified = set()
for a in hostaddr:
address = a[4][0]
if address in verified:
continue
if address in ('127.0.0.1', '::1'):
raise HostForwardLookupError("The IPA Server hostname must not resolve to localhost (%s). A routable IP address must be used. Check /etc/hosts to see if %s is an alias for %s" % (address, host_name, address))
try:
logger.debug('Check reverse address of %s', address)
revname = socket.gethostbyaddr(address)[0]
except Exception as e:
logger.debug('Check failed: %s', e)
logger.error(
"Unable to resolve the IP address %s to a host name, "
"check /etc/hosts and DNS name resolution", address)
else:
logger.debug('Found reverse name: %s', revname)
if revname != host_name:
logger.error(
"The host name %s does not match the value %s obtained "
"by reverse lookup on IP address %s", host_name, revname,
address)
verified.add(address)
def record_in_hosts(ip, host_name=None, conf_file=paths.HOSTS):
"""
Search record in /etc/hosts - static table lookup for hostnames
In case of match, returns a tuple of ip address and a list of
hostname aliases
When no record is matched, None is returned
:param ip: IP address
:param host_name: Optional hostname to search
:param conf_file: Optional path to the lookup table
"""
hosts = open(conf_file, 'r').readlines()
for line in hosts:
line = line.rstrip('\n')
fields = line.partition('#')[0].split()
if len(fields) == 0:
continue
try:
hosts_ip = fields[0]
names = fields[1:]
if hosts_ip != ip:
continue
if host_name is not None:
if host_name in names:
return (hosts_ip, names)
else:
return None
return (hosts_ip, names)
except IndexError:
print("Warning: Erroneous line '%s' in %s" % (line, conf_file))
continue
return None
def add_record_to_hosts(ip, host_name, conf_file=paths.HOSTS):
hosts_fd = open(conf_file, 'r+')
hosts_fd.seek(0, 2)
hosts_fd.write(ip+'\t'+host_name+' '+host_name.split('.')[0]+'\n')
hosts_fd.close()
def read_ip_addresses():
ips = []
msg_first = "Please provide the IP address to be used for this host name"
msg_other = "Enter an additional IP address, or press Enter to skip"
while True:
msg = msg_other if ips else msg_first
ip = ipautil.user_input(msg, allow_empty=True)
if not ip:
break
try:
ip_parsed = ipautil.CheckedIPAddress(ip)
except Exception as e:
print("Error: Invalid IP Address %s: %s" % (ip, e))
continue
ips.append(ip_parsed)
return ips
def read_dns_forwarders():
addrs = []
if ipautil.user_input("Do you want to configure DNS forwarders?", True):
if dnsforwarders.detect_resolve1_resolv_conf():
servers = [
str(s) for s in dnsforwarders.get_resolve1_nameservers()
]
print(
"The following DNS servers are configured in "
"systemd-resolved: %s" % ", ".join(servers)
)
else:
servers = [
str(s) for s in dnsforwarders.get_dnspython_nameservers()
]
print(
"Following DNS servers are configured in /etc/resolv.conf: "
"%s" % ", ".join(servers)
)
if ipautil.user_input("Do you want to configure these servers as DNS "
"forwarders?", True):
addrs = servers[:]
print("All detected DNS servers were added. You can enter "
"additional addresses now:")
while True:
ip = ipautil.user_input("Enter an IP address for a DNS forwarder, "
"or press Enter to skip", allow_empty=True)
if not ip:
break
try:
ip_parsed = ipautil.CheckedIPAddress(ip, parse_netmask=False)
except Exception as e:
print("Error: Invalid IP Address %s: %s" % (ip, e))
print("DNS forwarder %s not added." % ip)
continue
if ip_parsed.is_loopback():
print("Error: %s is a loopback address" % ip)
print("DNS forwarder %s not added." % ip)
continue
print("DNS forwarder %s added. You may add another." % ip)
addrs.append(str(ip_parsed))
if not addrs:
print("No DNS forwarders configured")
else:
print("DNS forwarders: %s" % ", ".join(addrs))
return addrs
def get_password(prompt):
if os.isatty(sys.stdin.fileno()):
return getpass.getpass(prompt)
else:
sys.stdout.write(prompt)
sys.stdout.flush()
line = sys.stdin.readline()
if not line:
raise EOFError()
return line.rstrip()
def _read_password_default_validator(password):
if len(password) < 8:
raise ValueError("Password must be at least 8 characters long")
def validate_dm_password_ldap(password):
"""
Validate DM password by attempting to connect to LDAP. api.env has to
contain valid ldap_uri.
"""
client = ipaldap.LDAPClient(api.env.ldap_uri, cacert=paths.IPA_CA_CRT)
try:
client.simple_bind(ipaldap.DIRMAN_DN, password)
except errors.ACIError:
raise ValueError("Invalid Directory Manager password")
else:
client.unbind()
def read_password(user, confirm=True, validate=True, retry=True, validator=_read_password_default_validator):
correct = False
pwd = None
try:
while not correct:
if not retry:
correct = True
pwd = get_password(user + " password: ")
if not pwd:
continue
if validate:
try:
validator(pwd)
except ValueError as e:
print(str(e))
pwd = None
continue
if not confirm:
correct = True
continue
pwd_confirm = get_password("Password (confirm): ")
if pwd != pwd_confirm:
print("Password mismatch!")
print("")
pwd = None
else:
correct = True
except EOFError:
return None
finally:
print("")
return pwd
def update_file(filename, orig, subst):
if os.path.exists(filename):
st = os.stat(filename)
pattern = "%s" % re.escape(orig)
p = re.compile(pattern)
for line in fileinput.input(filename, inplace=1):
if not p.search(line):
sys.stdout.write(line)
else:
sys.stdout.write(p.sub(subst, line))
fileinput.close()
os.chown(filename, st.st_uid, st.st_gid) # reset perms
return 0
else:
print("File %s doesn't exist." % filename)
return 1
def kadmin(command):
return ipautil.run(
[
paths.KADMIN_LOCAL, "-q", command,
"-x", "ipa-setup-override-restrictions"
],
capture_output=True,
capture_error=True
)
def kadmin_addprinc(principal):
return kadmin("addprinc -randkey " + principal)
def kadmin_modprinc(principal, options):
return kadmin("modprinc " + options + " " + principal)
def create_keytab(path, principal):
try:
if os.path.isfile(path):
os.remove(path)
except os.error:
logger.critical("Failed to remove %s.", path)
return kadmin("ktadd -k " + path + " " + principal)
def resolve_ip_addresses_nss(fqdn):
"""Get list of IP addresses for given host (using NSS/getaddrinfo).
:returns:
list of IP addresses as UnsafeIPAddress objects
"""
# it would be good disable search list processing from resolv.conf
# to avoid cases where we get IP address for an totally different name
# but there is no way to do this using getaddrinfo parameters
try:
addrinfos = socket.getaddrinfo(fqdn, None,
socket.AF_UNSPEC, socket.SOCK_STREAM)
except socket.error as ex:
if ex.errno in (socket.EAI_NODATA, socket.EAI_NONAME):
logger.debug('Name %s does not have any address: %s', fqdn, ex)
return set()
else:
raise
# accept whatever we got from NSS
ip_addresses = set()
for ai in addrinfos:
try:
ip = ipautil.UnsafeIPAddress(ai[4][0])
except ValueError as ex:
# getaddinfo may return link-local address other similar oddities
# which are not accepted by CheckedIPAddress - skip these
logger.warning('Name %s resolved to an unacceptable IP '
'address %s: %s', fqdn, ai[4][0], ex)
else:
ip_addresses.add(ip)
logger.debug('Name %s resolved to %s', fqdn, ip_addresses)
return ip_addresses
def resolve_rrsets_nss(fqdn):
"""Get list of dnspython RRsets from NSS"""
if not isinstance(fqdn, DNSName):
fqdn = DNSName.from_text(fqdn)
ip_addresses = resolve_ip_addresses_nss(fqdn.to_text())
# split IP addresses into IPv4 and IPv6
ipv4 = []
ipv6 = []
for ip_address in ip_addresses:
# Skip reserved or link-local addresses
try:
ipautil.CheckedIPAddress(ip_address)
except ValueError as e:
logger.warning("Invalid IP address %s for %s: %s",
ip_address, fqdn, unicode(e))
continue
if ip_address.version == 4:
ipv4.append(str(ip_address))
elif ip_address.version == 6:
ipv6.append(str(ip_address))
# construct an RRset for each address type. TTL is irrelevant
ttl = 3600
rrs = []
if ipv4:
rrs.append(
rrset.from_text_list(
fqdn, ttl, rdataclass.IN, rdatatype.A, ipv4
)
)
if ipv6:
rrs.append(
rrset.from_text_list(
fqdn, ttl, rdataclass.IN, rdatatype.AAAA, ipv6
)
)
return rrs
def get_server_ip_address(host_name, unattended, setup_dns, ip_addresses):
hostaddr = resolve_ip_addresses_nss(host_name)
if hostaddr.intersection(
{ipautil.UnsafeIPAddress(ip) for ip in ['127.0.0.1', '::1']}):
print("The hostname resolves to the localhost address (127.0.0.1/::1)", file=sys.stderr)
print("Please change your /etc/hosts file so that the hostname", file=sys.stderr)
print("resolves to the ip address of your network interface.", file=sys.stderr)
print("The KDC service does not listen on localhost", file=sys.stderr)
print("", file=sys.stderr)
print("Please fix your /etc/hosts file and restart the setup program", file=sys.stderr)
raise ScriptError()
ips = []
if len(hostaddr):
for ha in hostaddr:
try:
ips.append(ipautil.CheckedIPAddress(ha))
except ValueError as e:
logger.warning("Invalid IP address %s for %s: %s",
ha, host_name, unicode(e))
if not ips and not ip_addresses:
if not unattended:
ip_addresses = read_ip_addresses()
if ip_addresses:
if setup_dns:
ips = ip_addresses
else:
# all specified addresses was resolved for this host
if set(ip_addresses) <= set(ips):
ips = ip_addresses
else:
print("Error: the hostname resolves to IP address(es) that are different", file=sys.stderr)
print("from those provided on the command line. Please fix your DNS", file=sys.stderr)
print("or /etc/hosts file and restart the installation.", file=sys.stderr)
print("Provided but not resolved address(es): %s" % \
", ".join(str(ip) for ip in (set(ip_addresses) - set(ips))), file=sys.stderr)
raise ScriptError()
if not ips:
print("No usable IP address provided nor resolved.", file=sys.stderr)
raise ScriptError()
for ip_address in ips:
# check /etc/hosts sanity
hosts_record = record_in_hosts(str(ip_address))
if hosts_record is not None:
primary_host = hosts_record[1][0]
if primary_host != host_name:
print("Error: there is already a record in /etc/hosts for IP address %s:" \
% ip_address, file=sys.stderr)
print(hosts_record[0], " ".join(hosts_record[1]), file=sys.stderr)
print("Chosen hostname %s does not match configured canonical hostname %s" \
% (host_name, primary_host), file=sys.stderr)
print("Please fix your /etc/hosts file and restart the installation.", file=sys.stderr)
raise ScriptError()
return ips
def update_hosts_file(ip_addresses, host_name, fstore):
"""
Update hosts with specified addresses
:param ip_addresses: list of IP addresses
:return:
"""
if not fstore.has_file(paths.HOSTS):
fstore.backup_file(paths.HOSTS)
for ip_address in ip_addresses:
if record_in_hosts(str(ip_address)):
continue
print("Adding [{address!s} {name}] to your /etc/hosts file".format(
address=ip_address, name=host_name))
add_record_to_hosts(str(ip_address), host_name)
def _ensure_nonempty_string(string, message):
if not isinstance(string, str) or not string:
raise ValueError(message)
def gpg_command(extra_args, password=None, workdir=None):
tempdir = tempfile.mkdtemp('', 'ipa-', workdir)
args = [
paths.GPG_AGENT,
'--batch',
'--homedir', tempdir,
'--daemon', paths.GPG2,
'--batch',
'--homedir', tempdir,
'--passphrase-fd', '0',
'--yes',
'--no-tty',
]
args.extend(extra_args)
try:
ipautil.run(args, stdin=password, skip_output=True)
finally:
shutil.rmtree(tempdir, ignore_errors=True)
# uses gpg to compress and encrypt a file
def encrypt_file(source, dest, password, workdir=None):
_ensure_nonempty_string(source, 'Missing Source File')
# stat it so that we get back an exception if it does no t exist
os.stat(source)
_ensure_nonempty_string(dest, 'Missing Destination File')
_ensure_nonempty_string(password, 'Missing Password')
extra_args = [
'-o', dest,
'-c', source,
]
gpg_command(extra_args, password, workdir)
def decrypt_file(source, dest, password, workdir=None):
_ensure_nonempty_string(source, 'Missing Source File')
# stat it so that we get back an exception if it does no t exist
os.stat(source)
_ensure_nonempty_string(dest, 'Missing Destination File')
_ensure_nonempty_string(password, 'Missing Password')
extra_args = [
'-o', dest,
'-d', source,
]
gpg_command(extra_args, password, workdir)
def expand_replica_info(filename, password):
"""
Decrypt and expand a replica installation file into a temporary
location. The caller is responsible to remove this directory.
"""
top_dir = tempfile.mkdtemp("ipa")
tarfile = top_dir+"/files.tar"
dir_path = top_dir + "/realm_info"
decrypt_file(filename, tarfile, password, top_dir)
ipautil.run([paths.TAR, "xf", tarfile, "-C", top_dir])
os.remove(tarfile)
return top_dir, dir_path
def read_replica_info(dir_path, rconfig):
"""
Read the contents of a replica installation file.
rconfig is a ReplicaConfig object
"""
filename = os.path.join(dir_path, "realm_info")
config = SafeConfigParser()
config.read(filename)
rconfig.realm_name = config.get("realm", "realm_name")
rconfig.master_host_name = config.get("realm", "master_host_name")
rconfig.domain_name = config.get("realm", "domain_name")
rconfig.host_name = config.get("realm", "destination_host")
rconfig.subject_base = config.get("realm", "subject_base")
try:
rconfig.version = int(config.get("realm", "version"))
except NoOptionError:
pass
def read_replica_info_dogtag_port(config_dir):
portfile = config_dir + "/dogtag_directory_port.txt"
default_port = 7389
if not os.path.isfile(portfile):
dogtag_master_ds_port = default_port
else:
with open(portfile) as fd:
try:
dogtag_master_ds_port = int(fd.read())
except (ValueError, IOError) as e:
logger.debug('Cannot parse dogtag DS port: %s', e)
logger.debug('Default to %d', default_port)
dogtag_master_ds_port = default_port
return dogtag_master_ds_port
def check_server_configuration():
"""
Check if IPA server is configured on the system.
This is done by checking if there are system restore (uninstall) files
present on the system. Note that this check can only be run with root
privileges.
When IPA is not configured, this function raises a RuntimeError exception.
Most convenient use case for the function is in install tools that require
configured IPA for its function.
"""
if not facts.is_ipa_configured():
raise ScriptError("IPA is not configured on this system.",
rval=SERVER_NOT_CONFIGURED)
def remove_file(filename):
"""Remove a file and log any exceptions raised.
"""
warnings.warn(
"Use 'ipapython.ipautil.remove_file'",
DeprecationWarning,
stacklevel=2
)
return ipautil.remove_file(filename)
def rmtree(path):
"""
Remove a directory structure and log any exceptions raised.
"""
warnings.warn(
"Use 'ipapython.ipautil.rmtree'",
DeprecationWarning,
stacklevel=2
)
return ipautil.rmtree(path)
def is_ipa_configured():
"""
Use the state to determine if IPA has been configured.
"""
warnings.warn(
"Use 'ipalib.facts.is_ipa_configured'",
DeprecationWarning,
stacklevel=2
)
return facts.is_ipa_configured()
def run_script(main_function, operation_name, log_file_name=None,
fail_message=None):
"""Run the given function as a command-line utility
This function:
- Runs the given function
- Formats any errors
- Exits with the appropriate code
:param main_function: Function to call
:param log_file_name: Name of the log file (displayed on unexpected errors)
:param operation_name: Name of the script
:param fail_message: Optional message displayed on failure
"""
logger.info('Starting script: %s', operation_name)
try:
try:
return_value = main_function()
except BaseException as e:
if (
isinstance(e, SystemExit) and
(e.code is None or e.code == 0) # pylint: disable=no-member
):
# Not an error after all
logger.info('The %s command was successful', operation_name)
else:
# Log at the DEBUG level, which is not output to the console
# (unless in debug/verbose mode), but is written to a logfile
# if one is open.
tb = sys.exc_info()[2]
logger.debug("%s", '\n'.join(traceback.format_tb(tb)))
logger.debug('The %s command failed, exception: %s: %s',
operation_name, type(e).__name__, e)
if fail_message and not isinstance(e, SystemExit):
print(fail_message)
raise
else:
if return_value:
logger.info('The %s command failed, return value %s',
operation_name, return_value)
else:
logger.info('The %s command was successful', operation_name)
sys.exit(return_value)
except BaseException as error:
message, exitcode = handle_error(error, log_file_name)
if message:
print(message, file=sys.stderr)
sys.exit(exitcode)
def handle_error(error, log_file_name=None):
"""Handle specific errors. Returns a message and return code"""
if isinstance(error, SystemExit):
if isinstance(error.code, int):
return None, error.code
elif error.code is None:
return None, 0
else:
return str(error), 1
if isinstance(error, RuntimeError):
return str(error), 1
if isinstance(error, KeyboardInterrupt):
return "Cancelled.", 1
if isinstance(error, admintool.ScriptError):
return error.msg, error.rval
if isinstance(error, socket.error):
return error, 1
if isinstance(error, errors.ACIError):
return str(error), 1
if isinstance(error, ldap.INVALID_CREDENTIALS):
return "Invalid password", 1
if isinstance(error, ldap.INSUFFICIENT_ACCESS):
return "Insufficient access", 1
if isinstance(error, ldap.LOCAL_ERROR):
return error.args[0].get('info', ''), 1
if isinstance(error, ldap.SERVER_DOWN):
return error.args[0]['desc'], 1
if isinstance(error, ldap.LDAPError):
message = 'LDAP error: %s\n%s\n%s' % (
type(error).__name__,
error.args[0]['desc'].strip(),
error.args[0].get('info', '').strip()
)
return message, 1
if isinstance(error, errors.LDAPError):
return "An error occurred while performing operations: %s" % error, 1
if isinstance(error, HostnameLocalhost):
message = textwrap.dedent("""
The hostname resolves to the localhost address (127.0.0.1/::1)
Please change your /etc/hosts file so that the hostname
resolves to the ip address of your network interface.
Please fix your /etc/hosts file and restart the setup program
""").strip()
return message, 1
if log_file_name:
message = "Unexpected error - see %s for details:" % log_file_name
else:
message = "Unexpected error"
message += '\n%s: %s' % (type(error).__name__, error)
return message, 1
def load_pkcs12(cert_files, key_password, key_nickname, ca_cert_files,
host_name=None, realm_name=None):
"""
Load and verify server certificate and private key from multiple files
The files are accepted in PEM and DER certificate, PKCS#7 certificate
chain, PKCS#8 and raw private key and PKCS#12 formats.
:param cert_files: Names of server certificate and private key files to
import
:param key_password: Password to decrypt private keys
:param key_nickname: Nickname of the private key to import from PKCS#12
files
:param ca_cert_files: Names of CA certificate files to import
:param host_name: Host name of the server
:returns: Temporary PKCS#12 file with the server certificate, private key
and CA certificate chain, password to unlock the PKCS#12 file and
the CA certificate of the CA that issued the server certificate
"""
with certs.NSSDatabase() as nssdb:
nssdb.create_db()
try:
nssdb.import_files(cert_files, True, key_password, key_nickname)
except RuntimeError as e:
raise ScriptError(str(e))
if ca_cert_files:
try:
nssdb.import_files(ca_cert_files)
except RuntimeError as e:
raise ScriptError(str(e))
for nickname, trust_flags in nssdb.list_certs():
if trust_flags.has_key:
key_nickname = nickname
continue
nssdb.trust_root_cert(nickname, EXTERNAL_CA_TRUST_FLAGS)
# Check we have the whole cert chain & the CA is in it
trust_chain = list(reversed(nssdb.get_trust_chain(key_nickname)))
ca_cert = None
for nickname in trust_chain[1:]:
cert = nssdb.get_cert(nickname)
if ca_cert is None:
ca_cert = cert
subject = DN(cert.subject)
issuer = DN(cert.issuer)
if subject == issuer:
break
else:
raise ScriptError(
"The full certificate chain is not present in %s" %
(", ".join(cert_files)))
# verify CA validity and pathlen. The trust_chain list is in reverse
# order. trust_chain[1] is the first intermediate CA cert and must
# have pathlen >= 0.
for minpathlen, nickname in enumerate(trust_chain[1:], start=0):
try:
nssdb.verify_ca_cert_validity(nickname, minpathlen)
except ValueError as e:
raise ScriptError(
"CA certificate %s in %s is not valid: %s" %
(subject, ", ".join(cert_files), e))
if host_name is not None:
try:
nssdb.verify_server_cert_validity(key_nickname, host_name)
except ValueError as e:
raise ScriptError(
"The server certificate in %s is not valid: %s" %
(", ".join(cert_files), e))
if realm_name is not None:
try:
nssdb.verify_kdc_cert_validity(key_nickname, realm_name)
except ValueError as e:
raise ScriptError(
"The KDC certificate in %s is not valid: %s" %
(", ".join(cert_files), e))
out_file = tempfile.NamedTemporaryFile()
out_password = ipautil.ipa_generate_password()
out_pwdfile = ipautil.write_tmp_file(out_password)
args = [
paths.PK12UTIL,
'-o', out_file.name,
'-n', key_nickname,
'-d', nssdb.secdir,
'-k', nssdb.pwd_file,
'-w', out_pwdfile.name,
]
ipautil.run(args)
return out_file, out_password, ca_cert
@contextmanager
def stopped_service(service, instance_name=""):
"""
Ensure that the specified service is stopped while the commands within
this context are executed.
Service is started at the end of the execution.
"""
if instance_name:
log_instance_name = "@{instance}".format(instance=instance_name)
else:
log_instance_name = ""
logger.debug('Ensuring that service %s%s is not running while '
'the next set of commands is being executed.', service,
log_instance_name)
service_obj = services.service(service, api)
# Figure out if the service is running, if not, yield
if not service_obj.is_running(instance_name):
logger.debug('Service %s%s is not running, continue.', service,
log_instance_name)
yield
else:
# Stop the service, do the required stuff and start it again
logger.debug('Stopping %s%s.', service, log_instance_name)
service_obj.stop(instance_name)
try:
yield
finally:
logger.debug('Starting %s%s.', service, log_instance_name)
service_obj.start(instance_name)
def check_entropy():
"""
Checks if the system has enough entropy, if not, displays warning message
"""
try:
with open(paths.ENTROPY_AVAIL, 'r') as efname:
if int(efname.read()) < 200:
emsg = 'WARNING: Your system is running out of entropy, ' \
'you may experience long delays'
service.print_msg(emsg)
logger.debug("%s", emsg)
except IOError as e:
logger.debug(
"Could not open %s: %s", paths.ENTROPY_AVAIL, e)
except ValueError as e:
logger.debug("Invalid value in %s %s", paths.ENTROPY_AVAIL, e)
def is_hidepid():
"""Determine if /proc is mounted with hidepid=1/2 option"""
try:
os.lstat('/proc/1/stat')
except (FileNotFoundError, PermissionError):
return True
return False
def in_container():
"""Determine if we're running in a container.
virt-what will return the underlying machine information so
isn't usable here.
systemd-detect-virt requires the whole systemd subsystem which
isn't a reasonable require in a container.
"""
data_sched = None
if not is_hidepid():
try:
with open('/proc/1/sched', 'r') as sched:
data_sched = sched.readline()
except (FileNotFoundError, PermissionError):
pass
data_cgroup = None
try:
with open('/proc/self/cgroup', 'r') as cgroup:
data_cgroup = cgroup.readline()
except (FileNotFoundError, PermissionError):
pass
checks = [
data_sched and data_sched.split()[0] not in ('systemd', 'init',),
data_cgroup and data_cgroup.split()[0] in ('libpod'),
os.path.exists('/.dockerenv'),
os.path.exists('/.dockerinit'),
os.getenv('container', None) is not None
]
return any(checks)
def check_available_memory(ca=False):
"""
Raise an exception if there isn't enough memory for IPA to install.
In a container then psutil will most likely return the host memory
and not the container. If in a container use the cgroup values which
also may not be constrained but it's the best approximation.
2GB is the rule-of-thumb minimum but the server is installable with
much less.
The CA uses ~150MB in a fresh install.
Use Kb instead of KiB to leave a bit of slush for the OS
"""
available = None
minimum_suggested = 1000 * 1000 * 1000 * 1.2
if not ca:
minimum_suggested -= 150 * 1000 * 1000
if in_container():
logger.debug("container detected")
# cgroup v1
if os.path.exists(
'/sys/fs/cgroup/memory/memory.limit_in_bytes'
) and os.path.exists('/sys/fs/cgroup/memory/memory.usage_in_bytes'):
logger.debug("cgroup v1")
limit_file = '/sys/fs/cgroup/memory/memory.limit_in_bytes'
usage_file = '/sys/fs/cgroup/memory/memory.usage_in_bytes'
# cgroup v2
elif os.path.exists(
'/sys/fs/cgroup/memory.current'
) and os.path.exists('/sys/fs/cgroup/memory.max'):
logger.debug("cgroup v2")
limit_file = '/sys/fs/cgroup/memory.max'
usage_file = '/sys/fs/cgroup/memory.current'
else:
raise ScriptError(
"Unable to determine the amount of available RAM"
)
with open(limit_file) as fd:
limit = fd.readline().rstrip()
with open(usage_file) as fd:
used = int(fd.readline())
# In cgroup v2 if there is no limit on the container then
# the maximum host memory is available. Fall back to the psutil
# method for determining availability.
if limit != 'max':
available = int(limit) - used
logger.debug("Max RAM %s, used RAM %s", limit, used)
if available is None:
# delay import of psutil. On import it opens files in /proc and
# can trigger a SELinux violation.
import psutil
available = psutil.virtual_memory().available
logger.debug(psutil.virtual_memory())
if available is None:
raise ScriptError(
"Unable to determine the amount of available RAM"
)
logger.debug("Available memory is %sB", available)
if available < minimum_suggested:
raise ScriptError(
"Less than the minimum 1.2GB of RAM is available, "
"%.2fGB available. Use --skip-mem-check to suppress this check."
% (available / (1024 * 1024 * 1024))
)
def load_external_cert(files, ca_subject):
"""
Load and verify external CA certificate chain from multiple files.
The files are accepted in PEM and DER certificate and PKCS#7 certificate
chain formats.
:param files: Names of files to import
:param ca_subject: IPA CA subject DN
:returns: Temporary file with the IPA CA certificate and temporary file
with the external CA certificate chain
"""
with certs.NSSDatabase() as nssdb:
nssdb.create_db()
try:
nssdb.import_files(files)
except RuntimeError as e:
raise ScriptError(str(e))
ca_subject = DN(ca_subject)
ca_nickname = None
cache = {}
for nickname, _trust_flags in nssdb.list_certs():
cert = nssdb.get_cert(nickname)
subject = DN(cert.subject)
issuer = DN(cert.issuer)
cache[nickname] = (cert, subject, issuer)
if subject == ca_subject:
ca_nickname = nickname
nssdb.trust_root_cert(nickname, EXTERNAL_CA_TRUST_FLAGS)
if ca_nickname is None:
raise ScriptError(
"IPA CA certificate with subject '%s' "
"was not found in %s." % (ca_subject, (",".join(files))))
trust_chain = list(reversed(nssdb.get_trust_chain(ca_nickname)))
ca_cert_chain = []
for nickname in trust_chain:
cert, subject, issuer = cache[nickname]
ca_cert_chain.append(cert)
if subject == issuer:
break
else:
raise ScriptError(
"CA certificate chain in %s is incomplete: "
"missing certificate with subject '%s'" %
(", ".join(files), issuer))
# verify CA validity and pathlen. The trust_chain list is in reverse
# order. The first entry is the signed IPA-CA and must have a
# pathlen of >= 0.
for minpathlen, nickname in enumerate(trust_chain, start=0):
try:
nssdb.verify_ca_cert_validity(nickname, minpathlen)
except ValueError as e:
cert, subject, issuer = cache[nickname]
raise ScriptError(
"CA certificate %s in %s is not valid: %s" %
(subject, ", ".join(files), e))
cert_file = tempfile.NamedTemporaryFile()
cert_file.write(ca_cert_chain[0].public_bytes(x509.Encoding.PEM) + b'\n')
cert_file.flush()
ca_file = tempfile.NamedTemporaryFile()
x509.write_certificate_list(
ca_cert_chain[1:],
ca_file.name,
mode=0o644
)
ca_file.flush()
return cert_file, ca_file
def get_current_platform():
"""Get current platform (without container suffix)
'fedora' and 'fedora_container' are considered the same platform. This
normalization ensures that older freeipa-container images can be upgraded
without a platform mismatch.
"""
platform = ipaplatform.NAME
if platform.endswith('_container'):
platform = platform[:-10]
return platform
def store_version():
"""Store current data version and platform. This is required for check if
upgrade is required.
"""
sysupgrade.set_upgrade_state('ipa', 'data_version',
version.VENDOR_VERSION)
sysupgrade.set_upgrade_state('ipa', 'platform', get_current_platform())
def check_version():
"""
:raise UpgradePlatformError: if platform is not the same
:raise UpgradeDataOlderVersionError: if data needs to be upgraded
:raise UpgradeDataNewerVersionError: older version of IPA was detected than data
:raise UpgradeMissingVersionError: if platform or version is missing
"""
state_platform = sysupgrade.get_upgrade_state('ipa', 'platform')
current_platform = get_current_platform()
if state_platform is not None:
if state_platform != current_platform:
raise UpgradePlatformError(
"platform mismatch (expected '%s', current '%s')" % (
state_platform, current_platform
)
)
else:
raise UpgradeMissingVersionError("no platform stored")
data_version = sysupgrade.get_upgrade_state('ipa', 'data_version')
if data_version is not None:
parsed_data_ver = tasks.parse_ipa_version(data_version)
parsed_ipa_ver = tasks.parse_ipa_version(version.VENDOR_VERSION)
if parsed_data_ver < parsed_ipa_ver:
raise UpgradeDataOlderVersionError(
"data needs to be upgraded (expected version '%s', current "
"version '%s')" % (version.VENDOR_VERSION, data_version)
)
elif parsed_data_ver > parsed_ipa_ver:
raise UpgradeDataNewerVersionError(
"data are in newer version than IPA (data version '%s', IPA "
"version '%s')" % (data_version, version.VENDOR_VERSION)
)
else:
raise UpgradeMissingVersionError("no data_version stored")
def realm_to_serverid(realm_name):
warnings.warn(
"Use 'ipapython.ipaldap.realm_to_serverid'",
DeprecationWarning,
stacklevel=2
)
return ipaldap.realm_to_serverid(realm_name)
def realm_to_ldapi_uri(realm_name):
warnings.warn(
"Use 'ipapython.ipaldap.realm_to_ldapi_uri'",
DeprecationWarning,
stacklevel=2
)
return ipaldap.realm_to_ldapi_uri(realm_name)
def check_creds(options, realm_name):
# Check if ccache is available
default_cred = None
try:
logger.debug('KRB5CCNAME set to %s',
os.environ.get('KRB5CCNAME', None))
# get default creds, will raise if none found
default_cred = gssapi.creds.Credentials()
principal = str(default_cred.name)
except gssapi.raw.misc.GSSError as e:
logger.debug('Failed to find default ccache: %s', e)
principal = None
# Check if the principal matches the requested one (if any)
if principal is not None and options.principal is not None:
op = options.principal
if op.find('@') == -1:
op = '%s@%s' % (op, realm_name)
if principal != op:
logger.debug('Specified principal %s does not match '
'available credentials (%s)',
options.principal, principal)
principal = None
if principal is None:
(ccache_fd, ccache_name) = tempfile.mkstemp()
os.close(ccache_fd)
options.created_ccache_file = ccache_name
if options.principal is not None:
principal = options.principal
else:
principal = 'admin'
stdin = None
if principal.find('@') == -1:
principal = '%s@%s' % (principal, realm_name)
if options.admin_password is not None:
stdin = options.admin_password
else:
if not options.unattended:
try:
stdin = getpass.getpass("Password for %s: " % principal)
except EOFError:
stdin = None
if not stdin:
logger.error(
"Password must be provided for %s.", principal)
raise ScriptError("Missing password for %s" % principal)
else:
if sys.stdin.isatty():
logger.error("Password must be provided in "
"non-interactive mode.")
logger.info("This can be done via "
"echo password | ipa-client-install "
"... or with the -w option.")
raise ScriptError("Missing password for %s" % principal)
else:
stdin = sys.stdin.readline()
# set options.admin_password for future use
options.admin_password = stdin
try:
kinit_password(principal, stdin, ccache_name)
except RuntimeError as e:
logger.error("Kerberos authentication failed: %s", e)
raise ScriptError("Invalid credentials: %s" % e)
os.environ['KRB5CCNAME'] = ccache_name
class ModifyLDIF(ldif.LDIFParser):
"""
Allows to modify LDIF file.
Operations keep the order in which were specified per DN.
Warning: only modifications of existing DNs are supported
"""
def __init__(self, input_file, output_file):
"""
:param input_file: an LDIF
:param output_file: an LDIF file
"""
ldif.LDIFParser.__init__(self, input_file)
self.writer = ldif.LDIFWriter(output_file)
self.dn_updated = set()
self.modifications = {} # keep modify operations in original order
def add_value(self, dn, attr, values):
"""
Add value to LDIF.
:param dn: DN of entry (must exists)
:param attr: attribute name
:param value: value to be added
"""
assert isinstance(values, list)
self.modifications.setdefault(dn, []).append(
dict(
op="add",
attr=attr,
values=values,
)
)
def remove_value(self, dn, attr, values=None):
"""
Remove value from LDIF.
:param dn: DN of entry
:param attr: attribute name
:param value: value to be removed, if value is None, attribute will
be removed
"""
assert values is None or isinstance(values, list)
self.modifications.setdefault(dn, []).append(
dict(
op="del",
attr=attr,
values=values,
)
)
def replace_value(self, dn, attr, values):
"""
Replace values in LDIF with new value.
:param dn: DN of entry
:param attr: attribute name
:param value: new value for atribute
"""
assert isinstance(values, list)
self.remove_value(dn, attr)
self.add_value(dn, attr, values)
def modifications_from_ldif(self, ldif_file):
"""
Parse ldif file. Default operation is add, only changetypes "add"
and "modify" are supported.
:param ldif_file: an opened file for read
:raises: ValueError
"""
parser = ldif.LDIFRecordList(ldif_file)
parser.parse()
last_dn = None
for dn, entry in parser.all_records:
if dn is None:
# ldif parser return None, if records belong to previous DN
dn = last_dn
else:
last_dn = dn
if "replace" in entry:
for attr in entry["replace"]:
attr = attr.decode('utf-8')
try:
self.replace_value(dn, attr, entry[attr])
except KeyError:
raise ValueError("replace: {dn}, {attr}: values are "
"missing".format(dn=dn, attr=attr))
elif "delete" in entry:
for attr in entry["delete"]:
attr = attr.decode('utf-8')
self.remove_value(dn, attr, entry.get(attr, None))
elif "add" in entry:
for attr in entry["add"]:
attr = attr.decode('utf-8')
try:
self.replace_value(dn, attr, entry[attr])
except KeyError:
raise ValueError("add: {dn}, {attr}: values are "
"missing".format(dn=dn, attr=attr))
else:
logger.error("Ignoring entry: %s : only modifications "
"are allowed (missing \"changetype: "
"modify\")", dn)
def handle(self, dn, entry):
if dn in self.modifications:
self.dn_updated.add(dn)
for mod in self.modifications.get(dn, []):
attr_name = mod["attr"]
values = mod["values"]
if mod["op"] == "del":
# delete
attribute = entry.setdefault(attr_name, [])
if values is None:
attribute = []
else:
attribute = [v for v in attribute if v not in values]
if not attribute: # empty
del entry[attr_name]
elif mod["op"] == "add":
# add
attribute = entry.setdefault(attr_name, [])
attribute.extend([v for v in values if v not in attribute])
else:
assert False, "Unknown operation: %r" % mod["op"]
self.writer.unparse(dn, entry)
def parse(self):
ldif.LDIFParser.parse(self)
# check if there are any remaining modifications
remaining_changes = set(self.modifications.keys()) - self.dn_updated
for dn in remaining_changes:
logger.error(
"DN: %s does not exists or haven't been updated", dn)
def remove_keytab(keytab_path):
"""
Remove Kerberos keytab and issue a warning if the procedure fails
:param keytab_path: path to the keytab file
"""
warnings.warn(
"Use 'ipapython.ipautil.remove_keytab'",
DeprecationWarning,
stacklevel=2
)
return ipautil.remove_keytab(keytab_path)
def remove_ccache(ccache_path=None, run_as=None):
"""
remove Kerberos credential cache, essentially a wrapper around kdestroy.
:param ccache_path: path to the ccache file
:param run_as: run kdestroy as this user
"""
warnings.warn(
"Use 'ipapython.ipautil.remove_ccache'",
DeprecationWarning,
stacklevel=2
)
return ipautil.remove_ccache(ccache_path=ccache_path, run_as=run_as)
def restart_dirsrv(instance_name="", capture_output=True):
"""
Restart Directory server and perform ldap reconnect.
"""
api.Backend.ldap2.disconnect()
services.knownservices.dirsrv.restart(instance_name=instance_name,
capture_output=capture_output,
wait=True, ldapi=True)
api.Backend.ldap2.connect()
def default_subject_base(realm_name):
return DN(('O', realm_name))
def default_ca_subject_dn(subject_base):
return DN(('CN', 'Certificate Authority'), subject_base)
def validate_mask():
try:
mask = os.umask(0)
finally:
os.umask(mask) # pylint: disable=used-before-assignment
mask_str = None
if mask & 0b111101101 > 0:
mask_str = "{:04o}".format(mask)
return mask_str
def get_replication_plugin_name(dirsrv_get_entry):
# Support renaming of a replication plugin in 389-ds
# IPA topology plugin depends on the replication plugin but
# 389-ds cannot handle older alias querying in the plugin
# configuration with 'nsslapd-plugin-depends-on-named: ..' attribute
#
# dirsrv_get_entry: function (dn, attrs) can return different types
# depending on the function. The 389-ds connection returns bytes
# and ipaldap will return a list of string values.
try:
entry = dirsrv_get_entry(
DN('cn=Multisupplier Replication Plugin,cn=plugins,cn=config'),
['cn'])
except (errors.NotFound, ldap.NO_SUCH_OBJECT):
return 'Multimaster Replication Plugin'
else:
cn = entry['cn']
if isinstance(cn, list):
return cn[0]
elif isinstance(cn, bytes):
return cn.decode('utf-8')
else:
raise RuntimeError(
'LDAP query returned unknown type for cn %s: %s' %
(cn, type(cn))
)