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|
# Authors:
# Jason Gerard DeRose <jderose@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 server.
Also see the `ipalib.rpc` module.
"""
from cgi import parse_qs
from xml.sax.saxutils import escape
from xmlrpclib import Fault
from ipalib import plugable
from ipalib.backend import Executioner
from ipalib.errors import PublicError, InternalError, CommandError, JSONError, ConversionError, CCacheError, RefererError, InvalidSessionPassword
from ipalib.request import context, Connection, destroy_context
from ipalib.rpc import xml_dumps, xml_loads
from ipalib.util import parse_time_duration
from ipalib.dn import DN
from ipaserver.plugins.ldap2 import ldap2
from ipapython.compat import json
from ipalib.session import session_mgr, AuthManager, get_ipa_ccache_name, load_ccache_data, bind_ipa_ccache, release_ipa_ccache, fmt_time, default_max_session_duration
from ipalib.backend import Backend
from ipalib.krb_utils import krb5_parse_ccache, KRB5_CCache, krb_ticket_expiration_threshold, krb5_format_principal_name
from ipapython import ipautil
from wsgiref.util import shift_path_info
from ipapython.version import VERSION
import base64
import os
import string
import datetime
from decimal import Decimal
import urlparse
import time
HTTP_STATUS_SUCCESS = '200 Success'
HTTP_STATUS_SERVER_ERROR = '500 Internal Server Error'
_not_found_template = """<html>
<head>
<title>404 Not Found</title>
</head>
<body>
<h1>Not Found</h1>
<p>
The requested URL <strong>%(url)s</strong> was not found on this server.
</p>
</body>
</html>"""
_bad_request_template = """<html>
<head>
<title>400 Bad Request</title>
</head>
<body>
<h1>Bad Request</h1>
<p>
<strong>%(message)s</strong>
</p>
</body>
</html>"""
_internal_error_template = """<html>
<head>
<title>500 Internal Server Error</title>
</head>
<body>
<h1>Internal Server Error</h1>
<p>
<strong>%(message)s</strong>
</p>
</body>
</html>"""
_unauthorized_template = """<html>
<head>
<title>401 Unauthorized</title>
</head>
<body>
<h1>Invalid Authentication</h1>
<p>
<strong>%(message)s</strong>
</p>
</body>
</html>"""
class HTTP_Status(plugable.Plugin):
def not_found(self, environ, start_response, url, message):
"""
Return a 404 Not Found error.
"""
status = '404 Not Found'
response_headers = [('Content-Type', 'text/html; charset=utf-8')]
self.info('%s: URL="%s", %s', status, url, message)
start_response(status, response_headers)
output = _not_found_template % dict(url=escape(url))
return [output]
def bad_request(self, environ, start_response, message):
"""
Return a 400 Bad Request error.
"""
status = '400 Bad Request'
response_headers = [('Content-Type', 'text/html; charset=utf-8')]
self.info('%s: %s', status, message)
start_response(status, response_headers)
output = _bad_request_template % dict(message=escape(message))
return [output]
def internal_error(self, environ, start_response, message):
"""
Return a 500 Internal Server Error.
"""
status = HTTP_STATUS_SERVER_ERROR
response_headers = [('Content-Type', 'text/html; charset=utf-8')]
self.error('%s: %s', status, message)
start_response(status, response_headers)
output = _internal_error_template % dict(message=escape(message))
return [output]
def unauthorized(self, environ, start_response, message, reason):
"""
Return a 401 Unauthorized error.
"""
status = '401 Unauthorized'
response_headers = [('Content-Type', 'text/html; charset=utf-8')]
if reason:
response_headers.append(('X-IPA-Rejection-Reason', reason))
self.info('%s: %s', status, message)
start_response(status, response_headers)
output = _unauthorized_template % dict(message=escape(message))
return [output]
def read_input(environ):
"""
Read the request body from environ['wsgi.input'].
"""
try:
length = int(environ.get('CONTENT_LENGTH'))
except (ValueError, TypeError):
return
return environ['wsgi.input'].read(length)
def params_2_args_options(params):
if len(params) == 0:
return (tuple(), dict())
if len(params) == 1:
return (params[0], dict())
return (params[0], params[1])
def nicify_query(query, encoding='utf-8'):
if not query:
return
for (key, value) in query.iteritems():
if len(value) == 0:
yield (key, None)
elif len(value) == 1:
yield (key, value[0].decode(encoding))
else:
yield (key, tuple(v.decode(encoding) for v in value))
def extract_query(environ):
"""
Return the query as a ``dict``, or ``None`` if no query is presest.
"""
qstr = None
if environ['REQUEST_METHOD'] == 'POST':
if environ['CONTENT_TYPE'] == 'application/x-www-form-urlencoded':
qstr = read_input(environ)
elif environ['REQUEST_METHOD'] == 'GET':
qstr = environ['QUERY_STRING']
if qstr:
query = dict(nicify_query(
parse_qs(qstr)#, keep_blank_values=True)
))
else:
query = {}
environ['wsgi.query'] = query
return query
class wsgi_dispatch(Executioner, HTTP_Status):
"""
WSGI routing middleware and entry point into IPA server.
The `wsgi_dispatch` plugin is the entry point into the IPA server.
It dispatchs the request to the appropriate wsgi application
handler which is specific to the authentication and RPC mechanism.
"""
def __init__(self):
super(wsgi_dispatch, self).__init__()
self.__apps = {}
def __iter__(self):
for key in sorted(self.__apps):
yield key
def __getitem__(self, key):
return self.__apps[key]
def __contains__(self, key):
return key in self.__apps
def __call__(self, environ, start_response):
self.debug('WSGI wsgi_dispatch.__call__:')
try:
return self.route(environ, start_response)
finally:
destroy_context()
def _on_finalize(self):
self.url = self.env['mount_ipa']
super(wsgi_dispatch, self)._on_finalize()
def route(self, environ, start_response):
key = environ.get('PATH_INFO')
if key in self.__apps:
app = self.__apps[key]
return app(environ, start_response)
url = environ['SCRIPT_NAME'] + environ['PATH_INFO']
return self.not_found(environ, start_response, url,
'URL fragment "%s" does not have a handler' % (key))
def mount(self, app, key):
"""
Mount the WSGI application *app* at *key*.
"""
# if self.__islocked__():
# raise StandardError('%s.mount(): locked, cannot mount %r at %r' % (
# self.name, app, key)
# )
if key in self.__apps:
raise StandardError('%s.mount(): cannot replace %r with %r at %r' % (
self.name, self.__apps[key], app, key)
)
self.debug('Mounting %r at %r', app, key)
self.__apps[key] = app
class WSGIExecutioner(Executioner):
"""
Base class for execution backends with a WSGI application interface.
"""
content_type = None
key = ''
def set_api(self, api):
super(WSGIExecutioner, self).set_api(api)
if 'wsgi_dispatch' in self.api.Backend:
self.api.Backend.wsgi_dispatch.mount(self, self.key)
def _on_finalize(self):
self.url = self.env.mount_ipa + self.key
super(WSGIExecutioner, self)._on_finalize()
def wsgi_execute(self, environ):
result = None
error = None
_id = None
lang = os.environ['LANG']
name = None
args = ()
options = {}
if not 'HTTP_REFERER' in environ:
return self.marshal(result, RefererError(referer='missing'), _id)
if not environ['HTTP_REFERER'].startswith('https://%s/ipa' % self.api.env.host) and not self.env.in_tree:
return self.marshal(result, RefererError(referer=environ['HTTP_REFERER']), _id)
try:
if ('HTTP_ACCEPT_LANGUAGE' in environ):
lang_reg_w_q = environ['HTTP_ACCEPT_LANGUAGE'].split(',')[0]
lang_reg = lang_reg_w_q.split(';')[0]
lang_ = lang_reg.split('-')[0]
if '-' in lang_reg:
reg = lang_reg.split('-')[1].upper();
else:
reg = lang_.upper()
os.environ['LANG'] = '%s_%s' % (lang_, reg)
if (
environ.get('CONTENT_TYPE', '').startswith(self.content_type)
and environ['REQUEST_METHOD'] == 'POST'
):
data = read_input(environ)
(name, args, options, _id) = self.unmarshal(data)
else:
(name, args, options, _id) = self.simple_unmarshal(environ)
if name not in self.Command:
raise CommandError(name=name)
result = self.Command[name](*args, **options)
except PublicError, e:
error = e
except StandardError, e:
self.exception(
'non-public: %s: %s', e.__class__.__name__, str(e)
)
error = InternalError()
finally:
os.environ['LANG'] = lang
if name and name in self.Command:
try:
params = self.Command[name].args_options_2_params(*args, **options)
except Exception, e:
self.info(
'exception %s caught when converting options: %s', e.__class__.__name__, str(e)
)
# get at least some context of what is going on
params = options
principal = getattr(context, 'principal', 'UNKNOWN')
if error:
self.info('%s: %s(%s): %s', principal, name, ', '.join(self.Command[name]._repr_iter(**params)), e.__class__.__name__)
else:
self.info('%s: %s(%s): SUCCESS', principal, name, ', '.join(self.Command[name]._repr_iter(**params)))
else:
self.info('%s: %s', context.principal, e.__class__.__name__)
return self.marshal(result, error, _id)
def simple_unmarshal(self, environ):
name = environ['PATH_INFO'].strip('/')
options = extract_query(environ)
return (name, tuple(), options, None)
def __call__(self, environ, start_response):
"""
WSGI application for execution.
"""
self.debug('WSGI WSGIExecutioner.__call__:')
try:
status = HTTP_STATUS_SUCCESS
response = self.wsgi_execute(environ)
headers = [('Content-Type', self.content_type + '; charset=utf-8')]
except StandardError, e:
self.exception('WSGI %s.__call__():', self.name)
status = HTTP_STATUS_SERVER_ERROR
response = status
headers = [('Content-Type', 'text/plain; charset=utf-8')]
session_data = getattr(context, 'session_data', None)
if session_data is not None:
# Send session cookie back and store session data
# FIXME: the URL path should be retreived from somewhere (but where?), not hardcoded
session_cookie = session_mgr.generate_cookie('/ipa', session_data['session_id'])
headers.append(('Set-Cookie', session_cookie))
start_response(status, headers)
return [response]
def unmarshal(self, data):
raise NotImplementedError('%s.unmarshal()' % self.fullname)
def marshal(self, result, error, _id=None):
raise NotImplementedError('%s.marshal()' % self.fullname)
class xmlserver(WSGIExecutioner, HTTP_Status):
"""
Execution backend plugin for XML-RPC server.
Also see the `ipalib.rpc.xmlclient` plugin.
"""
content_type = 'text/xml'
key = '/xml'
def _on_finalize(self):
self.__system = {
'system.listMethods': self.listMethods,
'system.methodSignature': self.methodSignature,
'system.methodHelp': self.methodHelp,
}
super(xmlserver, self)._on_finalize()
def __call__(self, environ, start_response):
'''
'''
self.debug('WSGI xmlserver.__call__:')
user_ccache=environ.get('KRB5CCNAME')
if user_ccache is None:
self.internal_error(environ, start_response,
'xmlserver.__call__: KRB5CCNAME not defined in HTTP request environment')
return self.marshal(None, CCacheError())
try:
self.create_context(ccache=user_ccache)
response = super(xmlserver, self).__call__(environ, start_response)
except PublicError, e:
status = HTTP_STATUS_SUCCESS
response = status
headers = [('Content-Type', 'text/plain; charset=utf-8')]
start_response(status, headers)
return self.marshal(None, e)
finally:
destroy_context()
return response
def listMethods(self, *params):
return tuple(name.decode('UTF-8') for name in self.Command)
def methodSignature(self, *params):
return u'methodSignature not implemented'
def methodHelp(self, *params):
return u'methodHelp not implemented'
def unmarshal(self, data):
(params, name) = xml_loads(data)
(args, options) = params_2_args_options(params)
return (name, args, options, None)
def marshal(self, result, error, _id=None):
if error:
self.debug('response: %s: %s', error.__class__.__name__, str(error))
response = Fault(error.errno, error.strerror)
else:
if isinstance(result, dict):
self.debug('response: entries returned %d', result.get('count', 1))
response = (result,)
return xml_dumps(response, methodresponse=True)
def json_encode_binary(val):
'''
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():
if isinstance(v, str):
new_dict[k] = {'__base64__' : base64.b64encode(v)}
else:
new_dict[k] = json_encode_binary(v)
del val
return new_dict
elif isinstance(val, (list, tuple)):
new_list = []
n = len(val)
i = 0
while i < n:
v = val[i]
if isinstance(v, str):
new_list.append({'__base64__' : base64.b64encode(v)})
else:
new_list.append(json_encode_binary(v))
i += 1
del val
return new_list
elif isinstance(val, str):
return {'__base64__' : base64.b64encode(val)}
elif isinstance(val, Decimal):
return {'__base64__' : base64.b64encode(str(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 val.has_key('__base64__'):
return base64.b64decode(val['__base64__'])
else:
new_dict = {}
for k,v in val.items():
if isinstance(v, dict) and v.has_key('__base64__'):
new_dict[k] = base64.b64decode(v['__base64__'])
else:
new_dict[k] = json_decode_binary(v)
del val
return new_dict
elif isinstance(val, list):
new_list = []
n = len(val)
i = 0
while i < n:
v = val[i]
if isinstance(v, dict) and v.has_key('__base64__'):
binary_val = base64.b64decode(v['__base64__'])
new_list.append(binary_val)
else:
new_list.append(json_decode_binary(v))
i += 1
del val
return new_list
else:
if isinstance(val, basestring):
try:
return val.decode('utf-8')
except UnicodeDecodeError:
raise ConversionError(
name=val,
error='incorrect type'
)
else:
return val
class jsonserver(WSGIExecutioner, HTTP_Status):
"""
JSON RPC server.
For information on the JSON-RPC spec, see:
http://json-rpc.org/wiki/specification
"""
content_type = 'application/json'
def __call__(self, environ, start_response):
'''
'''
self.debug('WSGI jsonserver.__call__:')
response = super(jsonserver, self).__call__(environ, start_response)
return response
def marshal(self, result, error, _id=None):
if error:
assert isinstance(error, PublicError)
error = dict(
code=error.errno,
message=error.strerror,
name=error.__class__.__name__,
)
principal = getattr(context, 'principal', 'UNKNOWN')
response = dict(
result=result,
error=error,
id=_id,
principal=unicode(principal),
version=unicode(VERSION),
)
response = json_encode_binary(response)
return json.dumps(response, sort_keys=True, indent=4)
def unmarshal(self, data):
try:
d = json.loads(data)
except ValueError, e:
raise JSONError(error=e)
if not isinstance(d, dict):
raise JSONError(error='Request must be a dict')
if 'method' not in d:
raise JSONError(error='Request is missing "method"')
if 'params' not in d:
raise JSONError(error='Request is missing "params"')
d = json_decode_binary(d)
method = d['method']
params = d['params']
_id = d.get('id')
if not isinstance(params, (list, tuple)):
raise JSONError(error='params must be a list')
if len(params) != 2:
raise JSONError(
error='params must contain [args, options]'
)
args = params[0]
if not isinstance(args, (list, tuple)):
raise JSONError(
error='params[0] (aka args) must be a list'
)
options = params[1]
if not isinstance(options, dict):
raise JSONError(
error='params[1] (aka options) must be a dict'
)
options = dict((str(k), v) for (k, v) in options.iteritems())
return (method, args, options, _id)
class AuthManagerKerb(AuthManager):
'''
Instances of the AuthManger class are used to handle
authentication events delivered by the SessionManager. This class
specifcally handles the management of Kerbeos credentials which
may be stored in the session.
'''
def __init__(self, name):
super(AuthManagerKerb, self).__init__(name)
def logout(self, session_data):
'''
The current user has requested to be logged out. To accomplish
this we remove the user's kerberos credentials from their
session. This does not destroy the session, it just prevents
it from being used for fast authentication. Because the
credentials are no longer in the session cache any future
attempt will require the acquisition of credentials using one
of the login mechanisms.
'''
if session_data.has_key('ccache_data'):
self.debug('AuthManager.logout.%s: deleting ccache_data', self.name)
del session_data['ccache_data']
else:
self.error('AuthManager.logout.%s: session_data does not contain ccache_data', self.name)
class KerberosSession(object):
'''
Functionally shared by all RPC handlers using both sessions and
Kerberos. This class must be implemented as a mixin class rather
than the more obvious technique of subclassing because the classes
needing this do not share a common base class.
'''
def kerb_session_on_finalize(self):
'''
Initialize values from the Env configuration.
Why do it this way and not simply reference
api.env.session_auth_duration? Because that config item cannot
be used directly, it must be parsed and converted to an
integer. It would be inefficient to reparse it on every
request. So we parse it once and store the result in the class
instance.
'''
# Set the session expiration time
try:
seconds = parse_time_duration(self.api.env.session_auth_duration)
self.session_auth_duration = int(seconds)
self.debug("session_auth_duration: %s", datetime.timedelta(seconds=self.session_auth_duration))
except Exception, e:
self.session_auth_duration = default_max_session_duration
self.error('unable to parse session_auth_duration, defaulting to %d: %s',
self.session_auth_duration, e)
def update_session_expiration(self, session_data, krb_endtime):
'''
Each time a session is created or accessed we need to update
it's expiration time. The expiration time is set inside the
session_data.
:parameters:
session_data
The session data whose expiration is being updatded.
krb_endtime
The UNIX timestamp for when the Kerberos credentials expire.
:returns:
None
'''
# Account for clock skew and/or give us some time leeway
krb_expiration = krb_endtime - krb_ticket_expiration_threshold
# Set the session expiration time
session_mgr.set_session_expiration_time(session_data,
duration=self.session_auth_duration,
max_age=krb_expiration,
duration_type=self.api.env.session_duration_type)
def finalize_kerberos_acquisition(self, who, ccache_name, environ, start_response, headers=None):
if headers is None:
headers = []
# Retrieve the session data (or newly create)
session_data = session_mgr.load_session_data(environ.get('HTTP_COOKIE'))
session_id = session_data['session_id']
self.debug('finalize_kerberos_acquisition: %s ccache_name="%s" session_id="%s"',
who, ccache_name, session_id)
# Copy the ccache file contents into the session data
session_data['ccache_data'] = load_ccache_data(ccache_name)
# Set when the session will expire
cc = KRB5_CCache(ccache_name)
endtime = cc.endtime(self.api.env.host, self.api.env.realm)
self.update_session_expiration(session_data, endtime)
# Store the session data now that it's been updated with the ccache
session_mgr.store_session_data(session_data)
# The request is finished with the ccache, destroy it.
release_ipa_ccache(ccache_name)
# Return success and set session cookie
session_cookie = session_mgr.generate_cookie('/ipa', session_id)
headers.append(('Set-Cookie', session_cookie))
start_response(HTTP_STATUS_SUCCESS, headers)
return ['']
class jsonserver_session(jsonserver, KerberosSession):
"""
JSON RPC server protected with session auth.
"""
key = '/session/json'
def __init__(self):
super(jsonserver_session, self).__init__()
auth_mgr = AuthManagerKerb(self.__class__.__name__)
session_mgr.auth_mgr.register(auth_mgr.name, auth_mgr)
def _on_finalize(self):
super(jsonserver_session, self)._on_finalize()
self.kerb_session_on_finalize()
def need_login(self, start_response):
status = '401 Unauthorized'
headers = []
response = ''
self.debug('jsonserver_session: %s need login', status)
start_response(status, headers)
return [response]
def __call__(self, environ, start_response):
'''
'''
self.debug('WSGI jsonserver_session.__call__:')
# Load the session data
session_data = session_mgr.load_session_data(environ.get('HTTP_COOKIE'))
session_id = session_data['session_id']
self.debug('jsonserver_session.__call__: session_id=%s start_timestamp=%s access_timestamp=%s expiration_timestamp=%s',
session_id,
fmt_time(session_data['session_start_timestamp']),
fmt_time(session_data['session_access_timestamp']),
fmt_time(session_data['session_expiration_timestamp']))
ccache_data = session_data.get('ccache_data')
# Redirect to login if no Kerberos credentials
if ccache_data is None:
self.debug('no ccache, need login')
return self.need_login(start_response)
ipa_ccache_name = bind_ipa_ccache(ccache_data)
# Redirect to login if Kerberos credentials are expired
cc = KRB5_CCache(ipa_ccache_name)
if not cc.valid(self.api.env.host, self.api.env.realm):
self.debug('ccache expired, deleting session, need login')
# The request is finished with the ccache, destroy it.
release_ipa_ccache(ipa_ccache_name)
return self.need_login(start_response)
# Update the session expiration based on the Kerberos expiration
endtime = cc.endtime(self.api.env.host, self.api.env.realm)
self.update_session_expiration(session_data, endtime)
# Store the session data in the per-thread context
setattr(context, 'session_data', session_data)
self.create_context(ccache=ipa_ccache_name)
try:
response = super(jsonserver_session, self).__call__(environ, start_response)
finally:
# Kerberos may have updated the ccache data during the
# execution of the command therefore we need refresh our
# copy of it in the session data so the next command sees
# the same state of the ccache.
#
# However we must be careful not to restore the ccache
# data in the session data if it was explicitly deleted
# during the execution of the command. For example the
# logout command removes the ccache data from the session
# data to invalidate the session credentials.
if session_data.has_key('ccache_data'):
session_data['ccache_data'] = load_ccache_data(ipa_ccache_name)
# The request is finished with the ccache, destroy it.
release_ipa_ccache(ipa_ccache_name)
# Store the session data.
session_mgr.store_session_data(session_data)
destroy_context()
return response
class jsonserver_kerb(jsonserver):
"""
JSON RPC server protected with kerberos auth.
"""
key = '/json'
def __call__(self, environ, start_response):
'''
'''
self.debug('WSGI jsonserver_kerb.__call__:')
user_ccache=environ.get('KRB5CCNAME')
if user_ccache is None:
self.internal_error(environ, start_response,
'jsonserver_kerb.__call__: KRB5CCNAME not defined in HTTP request environment')
return self.marshal(None, CCacheError())
self.create_context(ccache=user_ccache)
try:
response = super(jsonserver_kerb, self).__call__(environ, start_response)
finally:
destroy_context()
return response
class login_kerberos(Backend, KerberosSession, HTTP_Status):
key = '/session/login_kerberos'
def __init__(self):
super(login_kerberos, self).__init__()
def _on_finalize(self):
super(login_kerberos, self)._on_finalize()
self.api.Backend.wsgi_dispatch.mount(self, self.key)
self.kerb_session_on_finalize()
def __call__(self, environ, start_response):
self.debug('WSGI login_kerberos.__call__:')
# Get the ccache created by mod_auth_kerb
user_ccache_name=environ.get('KRB5CCNAME')
if user_ccache_name is None:
return self.internal_error(environ, start_response,
'login_kerberos: KRB5CCNAME not defined in HTTP request environment')
return self.finalize_kerberos_acquisition('login_kerberos', user_ccache_name, environ, start_response)
class login_password(Backend, KerberosSession, HTTP_Status):
content_type = 'text/plain'
key = '/session/login_password'
def __init__(self):
super(login_password, self).__init__()
def _on_finalize(self):
super(login_password, self)._on_finalize()
self.api.Backend.wsgi_dispatch.mount(self, self.key)
self.kerb_session_on_finalize()
def __call__(self, environ, start_response):
self.debug('WSGI login_password.__call__:')
# Get the user and password parameters from the request
content_type = environ.get('CONTENT_TYPE', '').lower()
if not content_type.startswith('application/x-www-form-urlencoded'):
return self.bad_request(environ, start_response, "Content-Type must be application/x-www-form-urlencoded")
method = environ.get('REQUEST_METHOD', '').upper()
if method == 'POST':
query_string = read_input(environ)
else:
return self.bad_request(environ, start_response, "HTTP request method must be POST")
try:
query_dict = urlparse.parse_qs(query_string)
except Exception, e:
return self.bad_request(environ, start_response, "cannot parse query data")
user = query_dict.get('user', None)
if user is not None:
if len(user) == 1:
user = user[0]
else:
return self.bad_request(environ, start_response, "more than one user parameter")
else:
return self.bad_request(environ, start_response, "no user specified")
password = query_dict.get('password', None)
if password is not None:
if len(password) == 1:
password = password[0]
else:
return self.bad_request(environ, start_response, "more than one password parameter")
else:
return self.bad_request(environ, start_response, "no password specified")
# Get the ccache we'll use and attempt to get credentials in it with user,password
ipa_ccache_name = get_ipa_ccache_name()
reason = 'invalid-password'
try:
self.kinit(user, self.api.env.realm, password, ipa_ccache_name)
except InvalidSessionPassword, e:
# Ok, now why is this bad. Is the password simply bad or is the
# password expired?
try:
dn = str(DN(('uid', user),
self.api.env.container_user,
self.api.env.basedn))
conn = ldap2(shared_instance=False,
ldap_uri=self.api.env.ldap_uri)
conn.connect(bind_dn=dn, bind_pw=password)
# password is ok, must be expired, lets double-check
(userdn, entry_attrs) = conn.get_entry(dn,
['krbpasswordexpiration'])
if 'krbpasswordexpiration' in entry_attrs:
expiration = entry_attrs['krbpasswordexpiration'][0]
try:
exp = time.strptime(expiration, '%Y%m%d%H%M%SZ')
if exp <= time.gmtime():
reason = 'password-expired'
except ValueError, v:
self.error('Unable to convert %s to a time string'
% expiration)
except Exception:
# It doesn't really matter how we got here but the user's
# password is not accepted or the user is unknown.
pass
finally:
if conn.isconnected():
conn.destroy_connection()
return self.unauthorized(environ, start_response, str(e), reason)
return self.finalize_kerberos_acquisition('login_password', ipa_ccache_name, environ, start_response)
def kinit(self, user, realm, password, ccache_name):
# Format the user as a kerberos principal
principal = krb5_format_principal_name(user, realm)
(stdout, stderr, returncode) = ipautil.run(['/usr/bin/kinit', principal],
env={'KRB5CCNAME':ccache_name},
stdin=password, raiseonerr=False)
self.debug('kinit: principal=%s returncode=%s, stderr="%s"',
principal, returncode, stderr)
if returncode != 0:
raise InvalidSessionPassword(principal=principal, message=unicode(stderr))
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