freeipa/ipalib/krb_utils.py
Christian Heimes 38d0e74b6d Move ipalib.install.kinit to ipalib
- kinit helpers are now in `ipalib.kinit`.
- helpers can now use default ccache locations like many other similar
  helpers
- helpers return the result from `run` for debugging
- constants are now in `krb_utils`
- helpers pass `KRB5*` and `GSS*` env vars along, so `KRB5_TRACE` works
- document how to kinit for `ipalib.api`

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
2024-03-27 18:07:17 +01:00

215 lines
7.1 KiB
Python

# Authors: John Dennis <jdennis@redhat.com>
#
# Copyright (C) 2012 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/>.
import time
import re
import gssapi
from ipalib import errors
#-------------------------------------------------------------------------------
# Kerberos error codes
KRB5_CC_NOTFOUND = 2529639053 # Matching credential not found
KRB5_FCC_NOFILE = 2529639107 # No credentials cache found
KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN = 2529638918 # client not found in Kerberos db
KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN = 2529638919 # Server not found in Kerberos database
KRB5KRB_AP_ERR_TKT_EXPIRED = 2529638944 # Ticket expired
KRB5_FCC_PERM = 2529639106 # Credentials cache permissions incorrect
KRB5_CC_FORMAT = 2529639111 # Bad format in credentials cache
KRB5_REALM_CANT_RESOLVE = 2529639132 # Cannot resolve network address for KDC in requested realm
# Cannot contact any KDC for requested realm
KRB5_KDC_UNREACH = 2529639068
# A service is not available that s required to process the request
KRB5KDC_ERR_SVC_UNAVAILABLE = 2529638941
# mechglue/gss_plugin.c: #define MAP_ERROR_BASE 0x04200000
GSSPROXY_MAP_ERROR_BASE = 69206016
# GSSProxy error codes
GSSPROXY_KRB5_FCC_NOFILE = GSSPROXY_MAP_ERROR_BASE + KRB5_FCC_NOFILE
krb_ticket_expiration_threshold = 60*5 # number of seconds to accmodate clock skew
krb5_time_fmt = '%m/%d/%y %H:%M:%S'
ccache_name_re = re.compile(r'^((\w+):)?(.+)')
#-------------------------------------------------------------------------------
def krb5_parse_ccache(ccache_name):
'''
Given a Kerberos ccache name parse it into it's scheme and
location components. Currently valid values for the scheme
are:
* FILE
* MEMORY
The scheme is always returned as upper case. If the scheme
does not exist it defaults to FILE.
:parameters:
ccache_name
The name of the Kerberos ccache.
:returns:
A two-tuple of (scheme, ccache)
'''
match = ccache_name_re.search(ccache_name)
if match:
scheme = match.group(2)
location = match.group(3)
if scheme is None:
scheme = 'FILE'
else:
scheme = scheme.upper()
return scheme, location
else:
raise ValueError('Invalid ccache name = "%s"' % ccache_name)
def krb5_unparse_ccache(scheme, name):
return '%s:%s' % (scheme.upper(), name)
def krb5_format_service_principal_name(service, host, realm):
'''
Given a Kerberos service principal name, the host where the
service is running and a Kerberos realm return the Kerberos V5
service principal name.
:parameters:
service
Service principal name.
host
The DNS name of the host where the service is located.
realm
The Kerberos realm the service exists in.
:returns:
Kerberos V5 service principal name.
'''
return '%s/%s@%s' % (service, host, realm)
def krb5_format_tgt_principal_name(realm):
'''
Given a Kerberos realm return the Kerberos V5 TGT name.
:parameters:
realm
The Kerberos realm the TGT exists in.
:returns:
Kerberos V5 TGT name.
'''
return krb5_format_service_principal_name('krbtgt', realm, realm)
def krb5_format_time(timestamp):
'''
Given a UNIX timestamp format it into a string in the same
manner the MIT Kerberos library does. Kerberos timestamps are
always in local time.
:parameters:
timestamp
Unix timestamp
:returns:
formated string
'''
return time.strftime(krb5_time_fmt, time.localtime(timestamp))
def get_credentials(name=None, ccache_name=None):
'''
Obtains GSSAPI credentials with given principal name from ccache. When no
principal name specified, it retrieves the default one for given
credentials cache.
:parameters:
name
gssapi.Name object specifying principal or None for the default
ccache_name
string specifying Kerberos credentials cache name or None for the
default
:returns:
gssapi.Credentials object
'''
store = None
if ccache_name:
store = {'ccache': ccache_name}
"""
https://datatracker.ietf.org/doc/html/rfc2744.html#section-5.2
gss_acquire_cred:
If credential acquisition is time-consuming for a mechanism, the
mechanism may choose to delay the actual acquisition until the
credential is required (e.g. by gss_init_sec_context or
gss_accept_sec_context). Such mechanism-specific implementation
decisions should be invisible to the calling application; thus a call
of gss_inquire_cred immediately following the call of
gss_acquire_cred must return valid credential data, and may therefore
incur the overhead of a deferred credential acquisition.
So, as gssapi.Credentials() calls only gss_acquire_cred it is not
guaranteed to have valid(not expired) returned creds and all the
callers of this function have to deal with GSSAPI exceptions by
themselves, for example, to handle ExpiredCredentialsError.
"""
return gssapi.Credentials(usage="initiate", name=name, store=store)
def get_principal(ccache_name=None):
'''
Gets default principal name from given credentials cache.
:parameters:
ccache_name
string specifying Kerberos credentials cache name or None for the
default
:returns:
Default principal name as string
:raises:
errors.CCacheError if the principal cannot be retrieved from given
ccache
'''
try:
creds = get_credentials(ccache_name=ccache_name)
return str(creds.name)
except gssapi.exceptions.GSSError as e:
raise errors.CCacheError(message=str(e))
def get_credentials_if_valid(name=None, ccache_name=None):
'''
Obtains GSSAPI credentials with principal name from ccache. When no
principal name specified, it retrieves the default one for given
credentials cache. When the credentials cannot be retrieved or aren't valid
it returns None.
:parameters:
name
gssapi.Name object specifying principal or None for the default
ccache_name
string specifying Kerberos credentials cache name or None for the
default
:returns:
gssapi.Credentials object or None if valid credentials weren't found
'''
try:
creds = get_credentials(name=name, ccache_name=ccache_name)
if creds.lifetime > 0:
return creds
except gssapi.exceptions.GSSError:
return None
return None