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974eb7b5ef
freeipa/ipalib/rpc.py
Martin Babinsky 974eb7b5ef ipalib: introduce Principal parameter 
This patch introduces a separate Principal parameter that allows the framework
to syntactically validate incoming/outcoming principals by using a single
shared codebase.

https://fedorahosted.org/freeipa/ticket/3864

Reviewed-By: David Kupka <dkupka@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>
2016-07-01 09:37:25 +02:00

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# Authors:
# Jason Gerard DeRose <jderose@redhat.com>
# Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2008 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/>.
"""
RPC client and shared RPC client/server functionality.
This module adds some additional functionality on top of the ``xmlrpc.client``
module in the Python standard library (``xmlrpclib`` in Python 2).
For documentation on the ``xmlrpclib`` module, see:
http://docs.python.org/2/library/xmlrpclib.html
Also see the `ipaserver.rpcserver` module.
"""
from __future__ import absolute_import
from decimal import Decimal
import datetime
import os
import locale
import base64
import json
import socket
import gzip
import gssapi
from dns import resolver, rdatatype
from dns.exception import DNSException
from nss.error import NSPRError
import six
from six.moves import urllib
from ipalib.backend import Connectible
from ipalib.constants import LDAP_GENERALIZED_TIME_FORMAT
from ipalib.errors import (public_errors, UnknownError, NetworkError,
KerberosError, XMLRPCMarshallError, JSONError, ConversionError)
from ipalib import errors, capabilities
from ipalib.request import context, Connection
from ipapython.ipa_log_manager import root_logger
from ipapython import ipautil
from ipapython import kernel_keyring
from ipapython.cookie import Cookie
from ipapython.dnsutil import DNSName
from ipalib.text import _
import ipapython.nsslib
from ipapython.nsslib import NSSConnection
from ipalib.krb_utils import KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN, KRB5KRB_AP_ERR_TKT_EXPIRED, \
KRB5_FCC_PERM, KRB5_FCC_NOFILE, KRB5_CC_FORMAT, \
KRB5_REALM_CANT_RESOLVE, KRB5_CC_NOTFOUND, get_principal
from ipapython.dn import DN
from ipapython.kerberos import Principal
from ipalib.capabilities import VERSION_WITHOUT_CAPABILITIES
from ipalib import api
# The XMLRPC client is in "six.moves.xmlrpc_client", but pylint
# cannot handle that
try:
from xmlrpclib import (Binary, Fault, DateTime, dumps, loads, ServerProxy,
Transport, ProtocolError, MININT, MAXINT)
except ImportError:
from xmlrpc.client import (Binary, Fault, DateTime, dumps, loads, ServerProxy,
Transport, ProtocolError, MININT, MAXINT)
if six.PY3:
unicode = str
COOKIE_NAME = 'ipa_session'
KEYRING_COOKIE_NAME = '%s_cookie:%%s' % COOKIE_NAME
errors_by_code = dict((e.errno, e) for e in public_errors)
def client_session_keyring_keyname(principal):
'''
Return the key name used for storing the client session data for
the given principal.
'''
return KEYRING_COOKIE_NAME % principal
def update_persistent_client_session_data(principal, data):
'''
Given a principal create or update the session data for that
principal in the persistent secure storage.
Raises ValueError if unable to perform the action for any reason.
'''
try:
keyname = client_session_keyring_keyname(principal)
except Exception as e:
raise ValueError(str(e))
# kernel_keyring only raises ValueError (why??)
kernel_keyring.update_key(keyname, data)
def read_persistent_client_session_data(principal):
'''
Given a principal return the stored session data for that
principal from the persistent secure storage.
Raises ValueError if unable to perform the action for any reason.
'''
try:
keyname = client_session_keyring_keyname(principal)
except Exception as e:
raise ValueError(str(e))
# kernel_keyring only raises ValueError (why??)
return kernel_keyring.read_key(keyname)
def delete_persistent_client_session_data(principal):
'''
Given a principal remove the session data for that
principal from the persistent secure storage.
Raises ValueError if unable to perform the action for any reason.
'''
try:
keyname = client_session_keyring_keyname(principal)
except Exception as e:
raise ValueError(str(e))
# kernel_keyring only raises ValueError (why??)
kernel_keyring.del_key(keyname)
def xml_wrap(value, version):
"""
Wrap all ``str`` in ``xmlrpc.client.Binary``.
Because ``xmlrpc.client.dumps()`` will itself convert all ``unicode`` instances
into UTF-8 encoded ``str`` instances, we don't do it here.
So in total, when encoding data for an XML-RPC packet, the following
transformations occur:
* All ``str`` instances are treated as binary data and are wrapped in
an ``xmlrpc.client.Binary()`` instance.
* Only ``unicode`` instances are treated as character data. They get
converted to UTF-8 encoded ``str`` instances (although as mentioned,
not by this function).
Also see `xml_unwrap()`.
:param value: The simple scalar or simple compound value to wrap.
"""
if type(value) in (list, tuple):
return tuple(xml_wrap(v, version) for v in value)
if isinstance(value, dict):
return dict(
(k, xml_wrap(v, version)) for (k, v) in value.items()
)
if type(value) is bytes:
return Binary(value)
if type(value) is Decimal:
# transfer Decimal as a string
return unicode(value)
if isinstance(value, six.integer_types) and (value < MININT or value > MAXINT):
return unicode(value)
if isinstance(value, DN):
return str(value)
# Encode datetime.datetime objects as xmlrpc.client.DateTime objects
if isinstance(value, datetime.datetime):
if capabilities.client_has_capability(version, 'datetime_values'):
return DateTime(value)
else:
return value.strftime(LDAP_GENERALIZED_TIME_FORMAT)
if isinstance(value, DNSName):
if capabilities.client_has_capability(version, 'dns_name_values'):
return {'__dns_name__': unicode(value)}
else:
return unicode(value)
if isinstance(value, Principal):
return unicode(value)
assert type(value) in (unicode, float, bool, type(None)) + six.integer_types
return value
def xml_unwrap(value, encoding='UTF-8'):
"""
Unwrap all ``xmlrpc.Binary``, decode all ``str`` into ``unicode``.
When decoding data from an XML-RPC packet, the following transformations
occur:
* The binary payloads of all ``xmlrpc.client.Binary`` instances are
returned as ``str`` instances.
* All ``str`` instances are treated as UTF-8 encoded Unicode strings.
They are decoded and the resulting ``unicode`` instance is returned.
Also see `xml_wrap()`.
:param value: The value to unwrap.
:param encoding: The Unicode encoding to use (defaults to ``'UTF-8'``).
"""
if type(value) in (list, tuple):
return tuple(xml_unwrap(v, encoding) for v in value)
if type(value) is dict:
if '__dns_name__' in value:
return DNSName(value['__dns_name__'])
else:
return dict(
(k, xml_unwrap(v, encoding)) for (k, v) in value.items()
)
if isinstance(value, bytes):
return value.decode(encoding)
if isinstance(value, Binary):
assert type(value.data) is bytes
return value.data
if isinstance(value, DateTime):
# xmlprc DateTime is converted to string of %Y%m%dT%H:%M:%S format
return datetime.datetime.strptime(str(value), "%Y%m%dT%H:%M:%S")
assert type(value) in (unicode, int, float, bool, type(None))
return value
def xml_dumps(params, version, methodname=None, methodresponse=False,
encoding='UTF-8'):
"""
Encode an XML-RPC data packet, transparently wraping ``params``.
This function will wrap ``params`` using `xml_wrap()` and will
then encode the XML-RPC data packet using ``xmlrpc.client.dumps()`` (from the
Python standard library).
For documentation on the ``xmlrpc.client.dumps()`` function, see:
http://docs.python.org/library/xmlrpc.client.html#convenience-functions
Also see `xml_loads()`.
:param params: A ``tuple`` or an ``xmlrpc.client.Fault`` instance.
:param methodname: The name of the method to call if this is a request.
:param methodresponse: Set this to ``True`` if this is a response.
:param encoding: The Unicode encoding to use (defaults to ``'UTF-8'``).
"""
if type(params) is tuple:
params = xml_wrap(params, version)
else:
assert isinstance(params, Fault)
return dumps(params,
methodname=methodname,
methodresponse=methodresponse,
encoding=encoding,
allow_none=True,
)
def json_encode_binary(val, version):
'''
JSON cannot encode binary values. We encode binary values in Python str
objects and text in Python unicode objects. In order to allow a binary
object to be passed through JSON we base64 encode it thus converting it to
text which JSON can transport. To assure we recognize the value is a base64
encoded representation of the original binary value and not confuse it with
other text we convert the binary value to a dict in this form:
{'__base64__' : base64_encoding_of_binary_value}
This modification of the original input value cannot be done "in place" as
one might first assume (e.g. replacing any binary items in a container
(e.g. list, tuple, dict) with the base64 dict because the container might be
an immutable object (i.e. a tuple). Therefore this function returns a copy
of any container objects it encounters with tuples replaced by lists. This
is O.K. because the JSON encoding will map both lists and tuples to JSON
arrays.
'''
if isinstance(val, dict):
new_dict = {}
for k, v in val.items():
new_dict[k] = json_encode_binary(v, version)
return new_dict
elif isinstance(val, (list, tuple)):
new_list = [json_encode_binary(v, version) for v in val]
return new_list
elif isinstance(val, bytes):
encoded = base64.b64encode(val)
if not six.PY2:
encoded = encoded.decode('ascii')
return {'__base64__': encoded}
elif isinstance(val, Decimal):
return {'__base64__': base64.b64encode(str(val))}
elif isinstance(val, DN):
return str(val)
elif isinstance(val, datetime.datetime):
if capabilities.client_has_capability(version, 'datetime_values'):
return {'__datetime__': val.strftime(LDAP_GENERALIZED_TIME_FORMAT)}
else:
return val.strftime(LDAP_GENERALIZED_TIME_FORMAT)
elif isinstance(val, DNSName):
if capabilities.client_has_capability(version, 'dns_name_values'):
return {'__dns_name__': unicode(val)}
else:
return unicode(val)
elif isinstance(val, Principal):
return unicode(val)
else:
return val
def json_decode_binary(val):
'''
JSON cannot transport binary data. In order to transport binary data we
convert binary data to a form like this:
{'__base64__' : base64_encoding_of_binary_value}
see json_encode_binary()
After JSON had decoded the JSON stream back into a Python object we must
recursively scan the object looking for any dicts which might represent
binary values and replace the dict containing the base64 encoding of the
binary value with the decoded binary value. Unlike the encoding problem
where the input might consist of immutable object, all JSON decoded
container are mutable so the conversion could be done in place. However we
don't modify objects in place because of side effects which may be
dangerous. Thus we elect to spend a few more cycles and avoid the
possibility of unintended side effects in favor of robustness.
'''
if isinstance(val, dict):
if '__base64__' in val:
return base64.b64decode(val['__base64__'])
elif '__datetime__' in val:
return datetime.datetime.strptime(val['__datetime__'],
LDAP_GENERALIZED_TIME_FORMAT)
elif '__dns_name__' in val:
return DNSName(val['__dns_name__'])
else:
return dict((k, json_decode_binary(v)) for k, v in val.items())
elif isinstance(val, list):
return tuple(json_decode_binary(v) for v in val)
else:
if isinstance(val, bytes):
try:
return val.decode('utf-8')
except UnicodeDecodeError:
raise ConversionError(
name=val,
error='incorrect type'
)
else:
return val
def decode_fault(e, encoding='UTF-8'):
assert isinstance(e, Fault)
if isinstance(e.faultString, bytes):
return Fault(e.faultCode, e.faultString.decode(encoding))
return e
def xml_loads(data, encoding='UTF-8'):
"""
Decode the XML-RPC packet in ``data``, transparently unwrapping its params.
This function will decode the XML-RPC packet in ``data`` using
``xmlrpc.client.loads()`` (from the Python standard library). If ``data``
contains a fault, ``xmlrpc.client.loads()`` will itself raise an
``xmlrpc.client.Fault`` exception.
Assuming an exception is not raised, this function will then unwrap the
params in ``data`` using `xml_unwrap()`. Finally, a
``(params, methodname)`` tuple is returned containing the unwrapped params
and the name of the method being called. If the packet contains no method
name, ``methodname`` will be ``None``.
For documentation on the ``xmlrpc.client.loads()`` function, see:
http://docs.python.org/2/library/xmlrpclib.html#convenience-functions
Also see `xml_dumps()`.
:param data: The XML-RPC packet to decode.
"""
try:
(params, method) = loads(data)
return (xml_unwrap(params), method)
except Fault as e:
raise decode_fault(e)
class DummyParser(object):
def __init__(self):
self.data = []
def feed(self, data):
self.data.append(data)
def close(self):
return b''.join(self.data)
class MultiProtocolTransport(Transport):
"""Transport that handles both XML-RPC and JSON"""
def __init__(self, protocol):
Transport.__init__(self)
self.protocol = protocol
def getparser(self):
if self.protocol == 'json':
parser = DummyParser()
return parser, parser
else:
return Transport.getparser(self)
def send_content(self, connection, request_body):
if self.protocol == 'json':
connection.putheader("Content-Type", "application/json")
else:
connection.putheader("Content-Type", "text/xml")
# gzip compression would be set up here, but we have it turned off
# (encode_threshold is None)
connection.putheader("Content-Length", str(len(request_body)))
connection.endheaders(request_body)
class LanguageAwareTransport(MultiProtocolTransport):
"""Transport sending Accept-Language header"""
def get_host_info(self, host):
host, extra_headers, x509 = MultiProtocolTransport.get_host_info(
self, host)
try:
lang = locale.setlocale(locale.LC_ALL, '').split('.')[0].lower()
except locale.Error:
# fallback to default locale
lang = 'en_us'
if not isinstance(extra_headers, list):
extra_headers = []
extra_headers.append(
('Accept-Language', lang.replace('_', '-'))
)
extra_headers.append(
('Referer', 'https://%s/ipa/xml' % str(host))
)
return (host, extra_headers, x509)
class SSLTransport(LanguageAwareTransport):
"""Handles an HTTPS transaction to an XML-RPC server."""
def get_connection_dbdir(self):
"""
If there is a connections open it may have already initialized
NSS database. Return the database location used by the connection.
"""
for value in context.__dict__.values():
if not isinstance(value, Connection):
continue
if not isinstance(
getattr(value.conn, '_ServerProxy__transport', None),
SSLTransport):
continue
if hasattr(value.conn._ServerProxy__transport, 'dbdir'):
return value.conn._ServerProxy__transport.dbdir
return None
def make_connection(self, host):
host, self._extra_headers, x509 = self.get_host_info(host)
if self._connection and host == self._connection[0]:
return self._connection[1]
dbdir = context.nss_dir
connection_dbdir = self.get_connection_dbdir()
if connection_dbdir:
# If an existing connection is already using the same NSS
# database there is no need to re-initialize.
no_init = dbdir == connection_dbdir
else:
# If the NSS database is already being used there is no
# need to re-initialize.
no_init = dbdir == ipapython.nsslib.current_dbdir
conn = NSSConnection(host, 443, dbdir=dbdir, no_init=no_init,
tls_version_min=api.env.tls_version_min,
tls_version_max=api.env.tls_version_max)
self.dbdir=dbdir
conn.connect()
self._connection = host, conn
return self._connection[1]
class KerbTransport(SSLTransport):
"""
Handles Kerberos Negotiation authentication to an XML-RPC server.
"""
flags = [gssapi.RequirementFlag.mutual_authentication,
gssapi.RequirementFlag.out_of_sequence_detection]
def __init__(self, *args, **kwargs):
SSLTransport.__init__(self, *args, **kwargs)
self._sec_context = None
def _handle_exception(self, e, service=None):
minor = e.min_code
if minor == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
raise errors.ServiceError(service=service)
elif minor == KRB5_FCC_NOFILE:
raise errors.NoCCacheError()
elif minor == KRB5KRB_AP_ERR_TKT_EXPIRED:
raise errors.TicketExpired()
elif minor == KRB5_FCC_PERM:
raise errors.BadCCachePerms()
elif minor == KRB5_CC_FORMAT:
raise errors.BadCCacheFormat()
elif minor == KRB5_REALM_CANT_RESOLVE:
raise errors.CannotResolveKDC()
elif minor == KRB5_CC_NOTFOUND:
raise errors.CCacheError()
else:
raise errors.KerberosError(message=unicode(e))
def get_host_info(self, host):
"""
Two things can happen here. If we have a session we will add
a cookie for that. If not we will set an Authorization header.
"""
(host, extra_headers, x509) = SSLTransport.get_host_info(self, host)
if not isinstance(extra_headers, list):
extra_headers = []
session_cookie = getattr(context, 'session_cookie', None)
if session_cookie:
extra_headers.append(('Cookie', session_cookie))
return (host, extra_headers, x509)
# Set the remote host principal
service = "HTTP@" + host.split(':')[0]
try:
name = gssapi.Name(service, gssapi.NameType.hostbased_service)
self._sec_context = gssapi.SecurityContext(name=name, flags=self.flags)
response = self._sec_context.step()
except gssapi.exceptions.GSSError as e:
self._handle_exception(e, service=service)
self._set_auth_header(extra_headers, response)
return (host, extra_headers, x509)
def _set_auth_header(self, extra_headers, token):
for (h, v) in extra_headers:
if h == 'Authorization':
extra_headers.remove((h, v))
break
if token:
extra_headers.append(
('Authorization', 'negotiate %s' % base64.b64encode(token).decode('ascii'))
)
def _auth_complete(self, response):
if self._sec_context:
header = response.getheader('www-authenticate', '')
token = None
for field in header.split(','):
k, _, v = field.strip().partition(' ')
if k.lower() == 'negotiate':
try:
token = base64.b64decode(v.encode('ascii'))
break
# b64decode raises TypeError on invalid input
except (TypeError, UnicodeError):
pass
if not token:
raise KerberosError(message="No valid Negotiate header in server response")
token = self._sec_context.step(token=token)
if self._sec_context.complete:
self._sec_context = None
return True
self._set_auth_header(self._extra_headers, token)
return False
return True
def single_request(self, host, handler, request_body, verbose=0):
# Based on Python 2.7's xmllib.Transport.single_request
try:
h = SSLTransport.make_connection(self, host)
if verbose:
h.set_debuglevel(1)
while True:
if six.PY2:
self.send_request(h, handler, request_body)
self.send_host(h, host)
self.send_user_agent(h)
self.send_content(h, request_body)
response = h.getresponse(buffering=True)
else:
self.__send_request(h, host, handler, request_body, verbose)
response = h.getresponse()
if response.status != 200:
if (response.getheader("content-length", 0)):
response.read()
if response.status == 401:
if not self._auth_complete(response):
continue
raise ProtocolError(
host + handler,
response.status, response.reason,
response.msg)
self.verbose = verbose
if not self._auth_complete(response):
continue
return self.parse_response(response)
except gssapi.exceptions.GSSError as e:
self._handle_exception(e)
finally:
self.close()
if six.PY3:
def __send_request(self, connection, host, handler, request_body, debug):
# Based on xmlrpc.client.Transport.send_request
headers = self._extra_headers[:]
if debug:
connection.set_debuglevel(1)
if self.accept_gzip_encoding and gzip:
connection.putrequest("POST", handler, skip_accept_encoding=True)
connection.putheader("Accept-Encoding", "gzip")
headers.append(("Accept-Encoding", "gzip"))
else:
connection.putrequest("POST", handler)
headers.append(("User-Agent", self.user_agent))
self.send_headers(connection, headers) # pylint: disable=E1101
self.send_content(connection, request_body)
return connection
def store_session_cookie(self, cookie_header):
'''
Given the contents of a Set-Cookie header scan the header and
extract each cookie contained within until the session cookie
is located. Examine the session cookie if the domain and path
are specified, if not update the cookie with those values from
the request URL. Then write the session cookie into the key
store for the principal. If the cookie header is None or the
session cookie is not present in the header no action is
taken.
Context Dependencies:
The per thread context is expected to contain:
principal
The current pricipal the HTTP request was issued for.
request_url
The URL of the HTTP request.
'''
if cookie_header is None:
return
principal = getattr(context, 'principal', None)
request_url = getattr(context, 'request_url', None)
root_logger.debug("received Set-Cookie '%s'", cookie_header)
# Search for the session cookie
try:
session_cookie = Cookie.get_named_cookie_from_string(cookie_header,
COOKIE_NAME, request_url)
except Exception as e:
root_logger.error("unable to parse cookie header '%s': %s", cookie_header, e)
return
if session_cookie is None:
return
cookie_string = str(session_cookie)
root_logger.debug("storing cookie '%s' for principal %s", cookie_string, principal)
try:
update_persistent_client_session_data(principal, cookie_string)
except Exception as e:
# Not fatal, we just can't use the session cookie we were sent.
pass
def parse_response(self, response):
self.store_session_cookie(response.getheader('Set-Cookie'))
return SSLTransport.parse_response(self, response)
class DelegatedKerbTransport(KerbTransport):
"""
Handles Kerberos Negotiation authentication and TGT delegation to an
XML-RPC server.
"""
flags = [gssapi.RequirementFlag.delegate_to_peer,
gssapi.RequirementFlag.mutual_authentication,
gssapi.RequirementFlag.out_of_sequence_detection]
class RPCClient(Connectible):
"""
Forwarding backend plugin for XML-RPC client.
Also see the `ipaserver.rpcserver.xmlserver` plugin.
"""
# Values to set on subclasses:
session_path = None
server_proxy_class = ServerProxy
protocol = None
env_rpc_uri_key = None
def get_url_list(self, rpc_uri):
"""
Create a list of urls consisting of the available IPA servers.
"""
# the configured URL defines what we use for the discovered servers
(scheme, netloc, path, params, query, fragment
) = urllib.parse.urlparse(rpc_uri)
servers = []
name = '_ldap._tcp.%s.' % self.env.domain
try:
answers = resolver.query(name, rdatatype.SRV)
except DNSException as e:
answers = []
for answer in answers:
server = str(answer.target).rstrip(".")
servers.append('https://%s%s' % (ipautil.format_netloc(server), path))
servers = list(set(servers))
# the list/set conversion won't preserve order so stick in the
# local config file version here.
cfg_server = rpc_uri
if cfg_server in servers:
# make sure the configured master server is there just once and
# it is the first one
servers.remove(cfg_server)
servers.insert(0, cfg_server)
else:
servers.insert(0, cfg_server)
return servers
def get_session_cookie_from_persistent_storage(self, principal):
'''
Retrieves the session cookie for the given principal from the
persistent secure storage. Returns None if not found or unable
to retrieve the session cookie for any reason, otherwise
returns a Cookie object containing the session cookie.
'''
# Get the session data, it should contain a cookie string
# (possibly with more than one cookie).
try:
cookie_string = read_persistent_client_session_data(principal)
except Exception as e:
return None
# Search for the session cookie within the cookie string
try:
session_cookie = Cookie.get_named_cookie_from_string(cookie_string, COOKIE_NAME)
except Exception as e:
return None
return session_cookie
def apply_session_cookie(self, url):
'''
Attempt to load a session cookie for the current principal
from the persistent secure storage. If the cookie is
successfully loaded adjust the input url's to point to the
session path and insert the session cookie into the per thread
context for later insertion into the HTTP request. If the
cookie is not successfully loaded then the original url is
returned and the per thread context is not modified.
Context Dependencies:
The per thread context is expected to contain:
principal
The current pricipal the HTTP request was issued for.
The per thread context will be updated with:
session_cookie
A cookie string to be inserted into the Cookie header
of the HTPP request.
'''
original_url = url
principal = getattr(context, 'principal', None)
session_cookie = self.get_session_cookie_from_persistent_storage(principal)
if session_cookie is None:
self.log.debug("failed to find session_cookie in persistent storage for principal '%s'",
principal)
return original_url
else:
self.debug("found session_cookie in persistent storage for principal '%s', cookie: '%s'",
principal, session_cookie)
# Decide if we should send the cookie to the server
try:
session_cookie.http_return_ok(original_url)
except Cookie.Expired as e:
self.debug("deleting session data for principal '%s': %s", principal, e)
try:
delete_persistent_client_session_data(principal)
except Exception as e:
pass
return original_url
except Cookie.URLMismatch as e:
self.debug("not sending session cookie, URL mismatch: %s", e)
return original_url
except Exception as e:
self.error("not sending session cookie, unknown error: %s", e)
return original_url
# O.K. session_cookie is valid to be returned, stash it away where it will will
# get included in a HTTP Cookie headed sent to the server.
self.log.debug("setting session_cookie into context '%s'", session_cookie.http_cookie())
setattr(context, 'session_cookie', session_cookie.http_cookie())
# Form the session URL by substituting the session path into the original URL
scheme, netloc, path, params, query, fragment = urllib.parse.urlparse(original_url)
path = self.session_path
# urlencode *can* take one argument
# pylint: disable=too-many-function-args
session_url = urllib.parse.urlunparse((scheme, netloc, path, params, query, fragment))
return session_url
def create_connection(self, ccache=None, verbose=None, fallback=None,
delegate=None, nss_dir=None):
if verbose is None:
verbose = self.api.env.verbose
if fallback is None:
fallback = self.api.env.fallback
if delegate is None:
delegate = self.api.env.delegate
if nss_dir is None:
nss_dir = self.api.env.nss_dir
try:
rpc_uri = self.env[self.env_rpc_uri_key]
principal = get_principal()
setattr(context, 'principal', principal)
# We have a session cookie, try using the session URI to see if it
# is still valid
if not delegate:
rpc_uri = self.apply_session_cookie(rpc_uri)
except (errors.CCacheError, ValueError):
# No session key, do full Kerberos auth
pass
context.nss_dir = nss_dir
urls = self.get_url_list(rpc_uri)
serverproxy = None
for url in urls:
kw = dict(allow_none=True, encoding='UTF-8')
kw['verbose'] = verbose
if url.startswith('https://'):
if delegate:
transport_class = DelegatedKerbTransport
else:
transport_class = KerbTransport
else:
transport_class = LanguageAwareTransport
kw['transport'] = transport_class(protocol=self.protocol)
self.log.info('trying %s' % url)
setattr(context, 'request_url', url)
serverproxy = self.server_proxy_class(url, **kw)
if len(urls) == 1:
# if we have only 1 server and then let the
# main requester handle any errors. This also means it
# must handle a 401 but we save a ping.
return serverproxy
try:
command = getattr(serverproxy, 'ping')
try:
response = command([], {})
except Fault as e:
e = decode_fault(e)
if e.faultCode in errors_by_code:
error = errors_by_code[e.faultCode]
raise error(message=e.faultString)
else:
raise UnknownError(
code=e.faultCode,
error=e.faultString,
server=url,
)
# We don't care about the response, just that we got one
break
except KerberosError as krberr:
# kerberos error on one server is likely on all
raise errors.KerberosError(message=unicode(krberr))
except ProtocolError as e:
if hasattr(context, 'session_cookie') and e.errcode == 401:
# Unauthorized. Remove the session and try again.
delattr(context, 'session_cookie')
try:
delete_persistent_client_session_data(principal)
except Exception as e:
# This shouldn't happen if we have a session but it isn't fatal.
pass
return self.create_connection(ccache, verbose, fallback, delegate)
if not fallback:
raise
serverproxy = None
except Exception as e:
if not fallback:
raise
else:
self.log.info('Connection to %s failed with %s', url, e)
serverproxy = None
if serverproxy is None:
raise NetworkError(uri=_('any of the configured servers'),
error=', '.join(urls))
return serverproxy
def destroy_connection(self):
conn = getattr(context, self.id, None)
if conn is not None:
conn = conn.conn._ServerProxy__transport
conn.close()
def _call_command(self, command, params):
"""Call the command with given params"""
# For XML, this method will wrap/unwrap binary values
# For JSON we do that in the proxy
return command(*params)
def forward(self, name, *args, **kw):
"""
Forward call to command named ``name`` over XML-RPC.
This method will encode and forward an XML-RPC request, and will then
decode and return the corresponding XML-RPC response.
:param command: The name of the command being forwarded.
:param args: Positional arguments to pass to remote command.
:param kw: Keyword arguments to pass to remote command.
"""
server = getattr(context, 'request_url', None)
self.log.info("Forwarding '%s' to %s server '%s'",
name, self.protocol, server)
command = getattr(self.conn, name)
params = [args, kw]
try:
return self._call_command(command, params)
except Fault as e:
e = decode_fault(e)
self.debug('Caught fault %d from server %s: %s', e.faultCode,
server, e.faultString)
if e.faultCode in errors_by_code:
error = errors_by_code[e.faultCode]
raise error(message=e.faultString)
raise UnknownError(
code=e.faultCode,
error=e.faultString,
server=server,
)
except NSPRError as e:
raise NetworkError(uri=server, error=str(e))
except ProtocolError as e:
# By catching a 401 here we can detect the case where we have
# a single IPA server and the session is invalid. Otherwise
# we always have to do a ping().
session_cookie = getattr(context, 'session_cookie', None)
if session_cookie and e.errcode == 401:
# Unauthorized. Remove the session and try again.
delattr(context, 'session_cookie')
try:
principal = getattr(context, 'principal', None)
delete_persistent_client_session_data(principal)
except Exception as e:
# This shouldn't happen if we have a session but it isn't fatal.
pass
# Create a new serverproxy with the non-session URI. If there
# is an existing connection we need to save the NSS dbdir so
# we can skip an unnecessary NSS_Initialize() and avoid
# NSS_Shutdown issues.
serverproxy = self.create_connection(os.environ.get('KRB5CCNAME'), self.env.verbose, self.env.fallback, self.env.delegate)
dbdir = None
current_conn = getattr(context, self.id, None)
if current_conn is not None:
dbdir = getattr(current_conn.conn._ServerProxy__transport, 'dbdir', None)
if dbdir is not None:
self.debug('Using dbdir %s' % dbdir)
setattr(context, self.id, Connection(serverproxy, self.disconnect))
if dbdir is not None:
current_conn = getattr(context, self.id, None)
current_conn.conn._ServerProxy__transport.dbdir = dbdir
return self.forward(name, *args, **kw)
raise NetworkError(uri=server, error=e.errmsg)
except socket.error as e:
raise NetworkError(uri=server, error=str(e))
except (OverflowError, TypeError) as e:
raise XMLRPCMarshallError(error=str(e))
class xmlclient(RPCClient):
session_path = '/ipa/session/xml'
server_proxy_class = ServerProxy
protocol = 'xml'
env_rpc_uri_key = 'xmlrpc_uri'
def _call_command(self, command, params):
version = params[1].get('version', VERSION_WITHOUT_CAPABILITIES)
params = xml_wrap(params, version)
result = command(*params)
return xml_unwrap(result)
class JSONServerProxy(object):
def __init__(self, uri, transport, encoding, verbose, allow_none):
split_uri = urllib.parse.urlsplit(uri)
if split_uri.scheme not in ("http", "https"):
raise IOError("unsupported XML-RPC protocol")
self.__host = split_uri.netloc
self.__handler = split_uri.path
self.__transport = transport
assert encoding == 'UTF-8'
assert allow_none
self.__verbose = verbose
# FIXME: Some of our code requires ServerProxy internals.
# But, xmlrpc.client.ServerProxy's _ServerProxy__transport can be accessed
# by calling serverproxy('transport')
self._ServerProxy__transport = transport
def __request(self, name, args):
payload = {'method': unicode(name), 'params': args, 'id': 0}
version = args[1].get('version', VERSION_WITHOUT_CAPABILITIES)
payload = json_encode_binary(payload, version)
if self.__verbose >= 2:
root_logger.info('Request: %s',
json.dumps(payload, sort_keys=True, indent=4))
response = self.__transport.request(
self.__host,
self.__handler,
json.dumps(payload).encode('utf-8'),
verbose=self.__verbose >= 3,
)
try:
response = json_decode_binary(json.loads(response.decode('ascii')))
except ValueError as e:
raise JSONError(error=str(e))
if self.__verbose >= 2:
root_logger.info(
'Response: %s',
json.dumps(json_encode_binary(response, version),
sort_keys=True, indent=4)
)
error = response.get('error')
if error:
try:
error_class = errors_by_code[error['code']]
except KeyError:
raise UnknownError(
code=error.get('code'),
error=error.get('message'),
server=self.__host,
)
else:
kw = error.get('data', {})
kw['message'] = error['message']
raise error_class(**kw)
return response['result']
def __getattr__(self, name):
def _call(*args):
return self.__request(name, args)
return _call
class jsonclient(RPCClient):
session_path = '/ipa/session/json'
server_proxy_class = JSONServerProxy
protocol = 'json'
env_rpc_uri_key = 'jsonrpc_uri'
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