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source: fedd/federation/access.py @ 968b84b

Last change on this file since 968b84b was d846cbe, checked in by Ted Faber <faber@…>, 11 years ago
Make error handling clearer
Property mode set to `100644`
File size: 27.3 KB

Line
1	#!/usr/local/bin/python
2
3	import os,sys
4	import stat # for chmod constants
5	import re
6	import random
7	import string
8	import copy
9	import pickle
10	import logging
11	import subprocess
12	import shlex
13
14	from threading import *
15	from M2Crypto.SSL import SSLError
16
17	from util import *
18	from deter import fedid, generate_fedid
19	from authorizer import authorizer
20	from service_error import service_error
21	from remote_service import xmlrpc_handler, soap_handler, service_caller
22
23	import httplib
24	import tempfile
25	from urlparse import urlparse
26
27	from deter import topdl
28	import list_log
29
30
31	# Make log messages disappear if noone configures a fedd logger
32	class nullHandler(logging.Handler):
33	def emit(self, record): pass
34
35	fl = logging.getLogger("fedd.access")
36	fl.addHandler(nullHandler())
37
38	class access_base:
39	"""
40	The implementation of access control based on mapping users to projects.
41
42	Users can be mapped to existing projects or have projects created
43	dynamically. This implements both direct requests and proxies.
44	"""
45
46	class parse_error(RuntimeError): pass
47
48	class access_attribute:
49	def __init__(self, attr, value, pri=1):
50	self.attr = attr
51	self.value = value
52	self.priority = pri
53	def __str__(self):
54	return "%s: %s (%d)" % (self.attr, self.value, self.priority)
55
56	def __init__(self, config=None, auth=None):
57	"""
58	Initializer. Pulls parameters out of the ConfigParser's access section.
59	"""
60
61	# Make sure that the configuration is in place
62	if not config:
63	raise RunTimeError("No config to fedd.access")
64
65	self.project_priority = config.getboolean("access", "project_priority")
66
67	self.certdir = config.get("access","certdir")
68	self.create_debug = config.getboolean("access", "create_debug")
69	self.cleanup = not config.getboolean("access", "leave_tmpfiles")
70	self.access_type = config.get("access", "type")
71	self.log = logging.getLogger("fedd.access")
72	set_log_level(config, "access", self.log)
73	self.state_lock = Lock()
74	self.state = { }
75	# subclasses fill with what and how they export.
76	self.exports = { }
77	# XXX: Configurable
78	self.imports = set(('SMB', 'seer', 'userconfig', 'seer_master',
79	'hide_hosts'))
80
81	if auth: self.auth = auth
82	else:
83	self.log.error(\
84	"[access]: No authorizer initialized, creating local one.")
85	auth = authorizer()
86
87	self.state_filename = config.get("access", "access_state")
88	self.read_state()
89
90	# Keep cert_file and cert_pwd coming from the same place
91	self.cert_file = config.get("access", "cert_file")
92	if self.cert_file:
93	self.cert_pwd = config.get("access", "cert_pw")
94	else:
95	self.cert_file = config.get("globals", "cert_file")
96	self.sert_pwd = config.get("globals", "cert_pw")
97
98	self.nat_portal = None
99
100	self.trusted_certs = config.get("access", "trusted_certs") or \
101	config.get("globals", "trusted_certs")
102
103
104	@staticmethod
105	def software_list(v):
106	"""
107	From a string containing a sequence of space separated pairs, return a
108	list of tuples with pairs of location and file.
109	"""
110	l = [ ]
111	if v:
112	ps = v.split(" ")
113	while len(ps):
114	loc, file = ps[0:2]
115	del ps[0:2]
116	l.append((loc, file))
117	return l
118
119	@staticmethod
120	def add_kit(e, kit):
121	"""
122	Add a Software object created from the list of (install, location)
123	tuples passed as kit to the software attribute of an object e. We
124	do this enough to break out the code, but it's kind of a hack to
125	avoid changing the old tuple rep.
126	"""
127
128	s = [ topdl.Software(install=i, location=l) for i, l in kit]
129
130	if isinstance(e.software, list): e.software.extend(s)
131	else: e.software = s
132
133
134	def read_access(self, fn, access_obj=None, default=[]):
135	"""
136	Read an access DB of the form
137	abac.attribute -> local_auth_data
138	The access dict is filled with mappings from the abac attributes (as
139	strings) to the access objects. The objects are strings by default,
140	but the class constructor is called with the string following the ->
141	and whitespace in the file.
142	"""
143
144	map_re = re.compile("(\S+)\s+->\s+(.*)")
145	priority_re = re.compile("([^,]+),\s*(\d+)")
146
147	if access_obj is None:
148	access_obj = lambda(x): "%s" % x
149
150	self.access = []
151	priorities = { }
152
153	f = open(fn, 'r')
154	try:
155	lineno = 0
156	for line in f:
157	lineno += 1
158	line = line.strip();
159	if len(line) == 0 or line.startswith('#'):
160	continue
161	m = map_re.match(line)
162	if m != None:
163	self.access.append(access_base.access_attribute(m.group(1),
164	access_obj(m.group(2))))
165	continue
166
167	# If a priority is found, collect them
168	m = priority_re.match(line)
169	if m:
170	try:
171	priorities[m.group(1)] = int(m.group(2))
172	except ValueError, e:
173	if self.log:
174	self.log.debug("Bad priority in %s line %d" % \
175	(fn, lineno))
176	continue
177
178	# Nothing matched to here: unknown line - raise exception
179	# (finally will close f)
180	raise self.parse_error(
181	"Unknown statement at line %d of %s" % \
182	(lineno, fn))
183	finally:
184	if f: f.close()
185
186	# Set priorities
187	for a in self.access:
188	if a.attr in priorities:
189	a.priority = priorities[a.attr]
190
191	# default access mappings
192	for a, v in default:
193	self.access.append(
194	access_base.access_attribute(attr=a, value=v, pri=0))
195
196
197
198	def write_state(self):
199	if self.state_filename:
200	try:
201	f = open(self.state_filename, 'w')
202	pickle.dump(self.state, f)
203	self.log.debug("Wrote state to %s" % self.state_filename)
204	except EnvironmentError, e:
205	self.log.error("Can't write file %s: %s" % \
206	(self.state_filename, e))
207	except pickle.PicklingError, e:
208	self.log.error("Pickling problem: %s" % e)
209	except TypeError, e:
210	self.log.error("Pickling problem (TypeError): %s" % e)
211
212
213	def read_state(self):
214	"""
215	Read a new copy of access state. Old state is overwritten.
216
217	State format is a simple pickling of the state dictionary.
218	"""
219	if self.state_filename:
220	try:
221	f = open(self.state_filename, "r")
222	self.state = pickle.load(f)
223	self.log.debug("[read_state]: Read state from %s" % \
224	self.state_filename)
225	except EnvironmentError, e:
226	self.log.warning(("[read_state]: No saved state: " +\
227	"Can't open %s: %s") % (self.state_filename, e))
228	except EOFError, e:
229	self.log.warning(("[read_state]: " +\
230	"Empty or damaged state file: %s:") % \
231	self.state_filename)
232	except pickle.UnpicklingError, e:
233	self.log.warning(("[read_state]: No saved state: " + \
234	"Unpickling failed: %s") % e)
235
236	def append_allocation_authorization(self, aid, attrs,
237	need_state_lock=False, write_state_file=False, state_attr='state'):
238	"""
239	Append the authorization information to system state. By default we
240	assume this is called with the state lock and with a write of the state
241	file in the near future, need_state_lock and write_state_file can
242	override this. The state_attr is the attribute in the access class
243	that holds the per allocation information. Some complex classes use
244	different names for the dict.
245	"""
246
247	for p, a in attrs:
248	self.auth.set_attribute(p, a)
249	self.auth.save()
250
251	if need_state_lock: self.state_lock.acquire()
252	d = getattr(self, state_attr)
253	if aid in d and 'auth' in d[aid]:
254	d[aid]['auth'].update(attrs)
255	if write_state_file: self.write_state()
256	if need_state_lock: self.state_lock.release()
257
258	def clear_allocation_authorization(self, aid, need_state_lock=False,
259	write_state_file=False, state_attr='state'):
260	"""
261	Attrs is a set of attribute principal pairs that need to be removed
262	from the authenticator. Remove them and save the authenticator. See
263	append_allocation_authorization for the various overrides.
264	"""
265
266	if need_state_lock: self.state_lock.acquire()
267	d = getattr(self, state_attr)
268	if aid in d and 'auth' in d[aid]:
269	for p, a in d[aid]['auth']:
270	self.auth.unset_attribute(p, a)
271	d[aid]['auth'] = set()
272	if write_state_file: self.write_state()
273	if need_state_lock: self.state_lock.release()
274	self.auth.save()
275
276	def lookup_access(self, req, fid, filter=None, compare=None):
277	"""
278	Check all the attributes that this controller knows how to map and see
279	if the requester is allowed to use any of them. If so return one.
280	Filter defined the objects to check - it's a function that returns true
281	for the objects to check - and cmp defines the order to check them in
282	as the cmp field of sorted(). If filter is None, all possibilities are
283	checked. If cmp is None, the choices are sorted by priority.
284	"""
285
286	# Import request credentials into this (clone later??)
287	if self.auth.import_credentials(
288	data_list=req.get('abac_credential', [])):
289	self.auth.save()
290
291	# NB: in the default case (the else), the comparison order is reversed
292	# so numerically larger priorities are checked first.
293	if compare: c = compare
294	else: c = lambda a, b: cmp(b,a)
295
296	if filter: f = filter
297	else: f = lambda(x): True
298
299	check = sorted([ a for a in self.access if f(a)], cmp=c)
300
301	# Check every attribute that we know how to map and take the first
302	# success.
303	fail_proofs = [ ]
304	for attr in check:
305	access_ok, proof = self.auth.check_attribute(fid, attr.attr,
306	with_proof=True)
307	if access_ok:
308	self.log.debug("Access succeeded for %s %s" % (attr.attr, fid))
309	return copy.copy(attr.value), [ fid ], proof
310	else:
311	fail_proofs.append(proof)
312	self.log.debug("Access failed for %s %s" % (attr.attr, fid))
313	else:
314	self.log.debug("Access denied for for %s" % fid)
315	# We only return one fail proof because returning hundreds (which
316	# is easy to do) locks up the fault mechanism.
317	if len(fail_proofs) == 0:
318	self.log.debug('No choices either: %s' % check)
319	raise service_error(service_error.access,
320	"Access denied - no way to grant requested access")
321	raise service_error(service_error.access, "Access denied",
322	proof=fail_proofs[0])
323
324
325
326	def get_handler(self, path, fid):
327	"""
328	This function is somewhat oddly named. It doesn't get a handler, it
329	handles GETs. Specifically, it handls https GETs for retrieving data
330	from the repository exported by the access server.
331	"""
332	self.log.info("Get handler %s %s" % (path, fid))
333	if len("%s" % fid) == 0:
334	return (None, None)
335	if self.auth.check_attribute(fid, path) and self.userconfdir:
336	return ("%s/%s" % (self.userconfdir, path), "application/binary")
337	else:
338	return (None, None)
339
340	def export_userconf(self, project):
341	dev_null = None
342	confid, confcert = generate_fedid("test", dir=self.userconfdir,
343	log=self.log)
344	conffilename = "%s/%s" % (self.userconfdir, str(confid))
345	cf = None
346	try:
347	cf = open(conffilename, "w")
348	os.chmod(conffilename, stat.S_IRUSR \| stat.S_IWUSR)
349	except EnvironmentError, e:
350	raise service_error(service_error.internal,
351	"Cannot create user configuration data")
352
353	try:
354	dev_null = open("/dev/null", "a")
355	except EnvironmentError, e:
356	self.log.error("export_userconf: can't open /dev/null: %s" % e)
357
358	cmd = "%s %s" % (self.userconfcmd, project)
359	try:
360	conf = subprocess.call(shlex.split(cmd),
361	stdout=cf, stderr=dev_null, close_fds=True)
362	except EnvironmentError,e:
363	raise service_error(service_error.internal,
364	"Could not run userconf command: %s %s" \
365	% (e.filename, e.strerror))
366
367	self.auth.set_attribute(confid, "/%s" % str(confid))
368
369	return confid, confcert
370
371	def export_SMB(self, id, state, project, user, attrs):
372	if project and user:
373	return [{
374	'id': id,
375	'name': 'SMB',
376	'visibility': 'export',
377	'server': 'http://fs:139',
378	'fedAttr': [
379	{ 'attribute': 'SMBSHARE', 'value': 'USERS' },
380	{ 'attribute': 'SMBUSER', 'value': user },
381	{ 'attribute': 'SMBPROJ', 'value': project },
382	]
383	}]
384	else:
385	self.log.warn("Cannot export SMB w/o user and project")
386	return [ ]
387
388	def export_seer(self, id, state, project, user, attrs):
389	return [{
390	'id': id,
391	'name': 'seer',
392	'visibility': 'export',
393	'server': 'http://control:16606',
394	}]
395
396	def export_local_seer(self, id, state, project, user, attrs):
397	return [{
398	'id': id,
399	'name': 'local_seer_control',
400	'visibility': 'export',
401	'server': 'http://control:16606',
402	}]
403
404	def export_seer_master(self, id, state, project, user, attrs):
405	return [{
406	'id': id,
407	'name': 'seer_master',
408	'visibility': 'export',
409	'server': 'http://seer-master:17707',
410	}]
411
412	def export_tmcd(self, id, state, project, user, attrs):
413	return [{
414	'id': id,
415	'name': 'seer',
416	'visibility': 'export',
417	'server': 'http://boss:7777',
418	}]
419
420	def export_userconfig(self, id, state, project, user, attrs):
421	if self.userconfdir and self.userconfcmd \
422	and self.userconfurl:
423	cid, cert = self.export_userconf(project)
424	state['userconfig'] = unicode(cid)
425	return [{
426	'id': id,
427	'name': 'userconfig',
428	'visibility': 'export',
429	'server': "%s/%s" % (self.userconfurl, str(cid)),
430	'fedAttr': [
431	{ 'attribute': 'cert', 'value': cert },
432	]
433	}]
434	else:
435	return [ ]
436
437	def export_hide_hosts(self, id, state, project, user, attrs):
438	return [{
439	'id': id,
440	'name': 'hide_hosts',
441	'visibility': 'export',
442	'fedAttr': [ x for x in attrs \
443	if x.get('attribute', "") == 'hosts'],
444	}]
445
446	def export_project_export(self, id, state, project, user, attrs):
447	rv = [ ]
448	rv.extend(self.export_SMB(id, state, project, user, attrs))
449	rv.extend(self.export_userconfig(id, state, project, user, attrs))
450	return rv
451
452	def export_services(self, sreq, project=None, user=None):
453	exp = [ ]
454	state = { }
455	for s in sreq:
456	sname = s.get('name', '')
457	svis = s.get('visibility', '')
458	sattrs = s.get('fedAttr', [])
459	if svis == 'export':
460	if sname in self.exports:
461	id = s.get('id', 'no_id')
462	exp.extend(self.exports[sname](id, state, project, user,
463	sattrs))
464
465	return (exp, state)
466
467	def build_access_response(self, alloc_id, pname, services, proof):
468	"""
469	Create the SOAP response.
470
471	Build the dictionary description of the response and use
472	fedd_utils.pack_soap to create the soap message. ap is the allocate
473	project message returned from a remote project allocation (even if that
474	allocation was done locally).
475	"""
476	# Because alloc_id is already a fedd_services_types.IDType_Holder,
477	# there's no need to repack it
478	msg = {
479	'allocID': alloc_id,
480	'proof': proof.to_dict(),
481	'fedAttr': [
482	{ 'attribute': 'domain', 'value': self.domain } ,
483	]
484	}
485
486	if pname:
487	msg['fedAttr'].append({ 'attribute': 'project', 'value': pname })
488	if self.dragon_endpoint:
489	msg['fedAttr'].append({'attribute': 'dragon',
490	'value': self.dragon_endpoint})
491	if self.deter_internal:
492	msg['fedAttr'].append({'attribute': 'deter_internal',
493	'value': self.deter_internal})
494	#XXX: ??
495	if self.dragon_vlans:
496	msg['fedAttr'].append({'attribute': 'vlans',
497	'value': self.dragon_vlans})
498
499	if self.nat_portal is not None:
500	msg['fedAttr'].append({'attribute': 'nat_portals', 'value': True})
501
502	if services:
503	msg['service'] = services
504	return msg
505
506	def generate_portal_configs(self, topo, pubkey_base, secretkey_base,
507	tmpdir, lproj, leid, connInfo, services):
508
509	def conninfo_to_dict(key, info):
510	"""
511	Make a cpoy of the connection information about key, and flatten it
512	into a single dict by parsing out any feddAttrs.
513	"""
514
515	rv = None
516	for i in info:
517	if key == i.get('portal', "") or \
518	key in [e.get('element', "") \
519	for e in i.get('member', [])]:
520	rv = i.copy()
521	break
522
523	else:
524	return rv
525
526	if 'fedAttr' in rv:
527	for a in rv['fedAttr']:
528	attr = a.get('attribute', "")
529	val = a.get('value', "")
530	if attr and attr not in rv:
531	rv[attr] = val
532	del rv['fedAttr']
533	return rv
534
535	# XXX: un hardcode this
536	def client_null(f, s):
537	print >>f, "Service: %s" % s['name']
538
539	def client_seer_master(f, s):
540	print >>f, 'PortalAlias: seer-master'
541
542	def client_smb(f, s):
543	print >>f, "Service: %s" % s['name']
544	smbshare = None
545	smbuser = None
546	smbproj = None
547	for a in s.get('fedAttr', []):
548	if a.get('attribute', '') == 'SMBSHARE':
549	smbshare = a.get('value', None)
550	elif a.get('attribute', '') == 'SMBUSER':
551	smbuser = a.get('value', None)
552	elif a.get('attribute', '') == 'SMBPROJ':
553	smbproj = a.get('value', None)
554
555	if all((smbshare, smbuser, smbproj)):
556	print >>f, "SMBshare: %s" % smbshare
557	print >>f, "ProjectUser: %s" % smbuser
558	print >>f, "ProjectName: %s" % smbproj
559
560	def client_hide_hosts(f, s):
561	for a in s.get('fedAttr', [ ]):
562	if a.get('attribute', "") == 'hosts':
563	print >>f, "Hide: %s" % a.get('value', "")
564
565	client_service_out = {
566	'SMB': client_smb,
567	'tmcd': client_null,
568	'seer': client_null,
569	'userconfig': client_null,
570	'project_export': client_null,
571	'seer_master': client_seer_master,
572	'hide_hosts': client_hide_hosts,
573	}
574
575	def client_seer_master_export(f, s):
576	print >>f, "AddedNode: seer-master"
577
578	def client_seer_local_export(f, s):
579	print >>f, "AddedNode: control"
580
581	client_export_service_out = {
582	'seer_master': client_seer_master_export,
583	'local_seer_control': client_seer_local_export,
584	}
585
586	def server_port(f, s):
587	p = urlparse(s.get('server', 'http://localhost'))
588	print >>f, 'port: remote:%s:%s:%s' % (p.port, p.hostname, p.port)
589
590	def server_null(f,s): pass
591
592	def server_seer(f, s):
593	print >>f, 'seer: True'
594
595	server_service_out = {
596	'SMB': server_port,
597	'tmcd': server_port,
598	'userconfig': server_null,
599	'project_export': server_null,
600	'seer': server_seer,
601	'seer_master': server_port,
602	'hide_hosts': server_null,
603	}
604	# XXX: end un hardcode this
605
606
607	seer_out = False
608	client_out = False
609	mproj = None
610	mexp = None
611	control_gw = None
612	testbed = ""
613	# Create configuration files for the portals
614	for e in [ e for e in topo.elements \
615	if isinstance(e, topdl.Computer) and e.get_attribute('portal')]:
616	myname = e.name
617	type = e.get_attribute('portal_type')
618
619	info = conninfo_to_dict(myname, connInfo)
620
621	if not info:
622	raise service_error(service_error.req,
623	"No connectivity info for %s" % myname)
624
625	peer = info.get('peer', "")
626	ldomain = self.domain
627	ssh_port = info.get('ssh_port', 22)
628
629	# Collect this for the client.conf file
630	if 'masterexperiment' in info:
631	mproj, meid = info['masterexperiment'].split("/", 1)
632
633	if type in ('control', 'both'):
634	testbed = e.get_attribute('testbed')
635	control_gw = myname
636
637	active = info.get('active', 'False')
638	nat_partner = info.get('nat_partner', 'False')
639
640	cfn = "%s/%s.gw.conf" % (tmpdir, myname.lower())
641	tunnelconfig = self.tunnel_config
642	try:
643	f = open(cfn, "w")
644	if active == 'True':
645	print >>f, "active: True"
646	print >>f, "ssh_port: %s" % ssh_port
647	if type in ('control', 'both'):
648	for s in [s for s in services \
649	if s.get('name', "") in self.imports]:
650	server_service_out[s['name']](f, s)
651
652	if nat_partner == 'True':
653	print >>f, "nat_partner: True"
654
655	if tunnelconfig:
656	print >>f, "tunnelip: %s" % tunnelconfig
657	print >>f, "peer: %s" % peer.lower()
658	print >>f, "ssh_pubkey: /proj/%s/exp/%s/tmp/%s" % \
659	(lproj, leid, pubkey_base)
660	print >>f, "ssh_privkey: /proj/%s/exp/%s/tmp/%s" % \
661	(lproj, leid, secretkey_base)
662	f.close()
663	except EnvironmentError, e:
664	raise service_error(service_error.internal,
665	"Can't write protal config %s: %s" % (cfn, e))
666
667	# Done with portals, write the client config file.
668	try:
669	f = open("%s/client.conf" % tmpdir, "w")
670	if control_gw:
671	print >>f, "ControlGateway: %s.%s.%s%s" % \
672	(myname.lower(), leid.lower(), lproj.lower(),
673	ldomain.lower())
674	for s in services:
675	if s.get('name',"") in self.imports and \
676	s.get('visibility','') == 'import':
677	client_service_out[s['name']](f, s)
678	if s.get('name', '') in self.exports and \
679	s.get('visibility', '') == 'export' and \
680	s['name'] in client_export_service_out:
681	client_export_service_out[s['name']](f, s)
682	# Seer uses this.
683	if mproj and meid:
684	print >>f, "ExperimentID: %s/%s" % (mproj, meid)
685	f.close()
686	except EnvironmentError, e:
687	raise service_error(service_error.internal,
688	"Cannot write client.conf: %s" %s)
689
690	def configure_userconf(self, services, tmpdir):
691	"""
692	If the userconf service was imported, collect the configuration data.
693	"""
694	for s in services:
695	s_name = s.get('name', '')
696	s_vis = s.get('visibility','')
697	if s_name == 'userconfig' and s_vis == 'import':
698	# Collect ther server and certificate info.
699	u = s.get('server', None)
700	for a in s.get('fedAttr', []):
701	if a.get('attribute',"") == 'cert':
702	cert = a.get('value', None)
703	break
704	else:
705	cert = None
706
707	if cert:
708	# Make a temporary certificate file for get_url. The
709	# finally clause removes it whether something goes
710	# wrong (including an exception from get_url) or not.
711	try:
712	tfos, tn = tempfile.mkstemp(suffix=".pem")
713	tf = os.fdopen(tfos, 'w')
714	print >>tf, cert
715	tf.close()
716	self.log.debug("Getting userconf info: %s" % u)
717	get_url(u, tn, tmpdir, "userconf")
718	self.log.debug("Got userconf info: %s" % u)
719	except EnvironmentError, e:
720	raise service_error(service.error.internal,
721	"Cannot create temp file for " +
722	"userconfig certificates: %s" % e)
723	except:
724	t, v, st = sys.exc_info()
725	raise service_error(service_error.internal,
726	"Error retrieving %s: %s" % (u, v))
727	finally:
728	if tn: os.remove(tn)
729	else:
730	raise service_error(service_error.req,
731	"No certificate for retreiving userconfig")
732	break
733
734	def import_store_info(self, cf, connInfo):
735	"""
736	Pull any import parameters in connInfo in. We translate them either
737	into known member names or fedAddrs.
738	"""
739
740	for c in connInfo:
741	for p in [ p for p in c.get('parameter', []) \
742	if p.get('type', '') == 'input']:
743	name = p.get('name', None)
744	key = p.get('key', None)
745	store = p.get('store', None)
746
747	if not all((name, key, store)):
748	raise service_error(service_error.internal,
749	'Bad Services missing info for import %s' % c)
750
751	req = { 'name': key, 'wait': True }
752	self.log.debug("Waiting for %s (%s) from %s" % \
753	(name, key, store))
754	r = self.call_GetValue(store, req, cf)
755	r = r.get('GetValueResponseBody', None)
756	if r is None:
757	raise service_error(service_error.internal,
758	'Badly formatted response: no GetValueResponseBody')
759	if r.get('name', '') != key:
760	raise service_error(service_error.internal,
761	'Different name returned for %s: %s' \
762	% (key, r.get('name','')))
763	v = r.get('value', None)
764	if v is None:
765	raise service_error(service_error.internal,
766	'None value exported for %s' % key)
767	if name == 'peer':
768	self.log.debug("Got peer %s" % v)
769	c['peer'] = v
770	else:
771	self.log.debug("Got %s %s" % (name, v))
772	if c.has_key('fedAttr'):
773	c['fedAttr'].append({
774	'attribute': name, 'value': v})
775	else:
776	c['fedAttr']= [{
777	'attribute': name, 'value': v}]
778
779	def remove_dirs(self, dir):
780	"""
781	Remove the directory tree and all files rooted at dir. Log any errors,
782	but continue.
783	"""
784	self.log.debug("[removedirs]: removing %s" % dir)
785	try:
786	for path, dirs, files in os.walk(dir, topdown=False):
787	for f in files:
788	os.remove(os.path.join(path, f))
789	for d in dirs:
790	os.rmdir(os.path.join(path, d))
791	os.rmdir(dir)
792	except EnvironmentError, e:
793	self.log.error("Error deleting directory tree in %s" % e);
794
795	def RequestAccess(self, req, fid):
796	"""
797	Handle an access request. Success here maps the requester into the
798	local access control space and establishes state about that user keyed
799	to a fedid. We also save a copy of the certificate underlying that
800	fedid so this allocation can access configuration information and
801	shared parameters on the experiment controller.
802	"""
803
804	self.log.info("RequestAccess called by %s" % fid)
805	# The dance to get into the request body
806	if req.has_key('RequestAccessRequestBody'):
807	req = req['RequestAccessRequestBody']
808	else:
809	raise service_error(service_error.req, "No request!?")
810
811	# Base class lookup routine. If this fails, it throws a service
812	# exception denying access that triggers a fault response back to the
813	# caller.
814	found, owners, proof = self.lookup_access(req, fid)
815	self.log.info(
816	"[RequestAccess] Access granted local creds %s" % found)
817	# Make a fedid for this allocation
818	allocID, alloc_cert = generate_fedid(subj="alloc", log=self.log)
819	aid = unicode(allocID)
820
821	# Store the data about this allocation:
822	self.state_lock.acquire()
823	self.state[aid] = { }
824	self.state[aid]['user'] = found
825	self.state[aid]['owners'] = owners
826	self.state[aid]['auth'] = set()
827	# Authorize the creating fedid and the principal representing the
828	# allocation to manipulate it.
829	self.append_allocation_authorization(aid,
830	((fid, allocID), (allocID, allocID)))
831	self.write_state()
832	self.state_lock.release()
833
834	# Create a directory to stash the certificate in, ans stash it.
835	try:
836	f = open("%s/%s.pem" % (self.certdir, aid), "w")
837	print >>f, alloc_cert
838	f.close()
839	except EnvironmentError, e:
840	raise service_error(service_error.internal,
841	"Can't open %s/%s : %s" % (self.certdir, aid, e))
842	self.log.debug('[RequestAccess] Returning allocation ID: %s' % allocID)
843	return { 'allocID': { 'fedid': allocID }, 'proof': proof.to_dict() }
844
845	def ReleaseAccess(self, req, fid):
846	"""
847	Release the allocation granted earlier. Access to the allocation is
848	checked and if valid, the state and cached certificate are destroyed.
849	"""
850	self.log.info("ReleaseAccess called by %s" % fid)
851	# The dance to get into the request body
852	if req.has_key('ReleaseAccessRequestBody'):
853	req = req['ReleaseAccessRequestBody']
854	else:
855	raise service_error(service_error.req, "No request!?")
856
857	# Pull a key out of the request. One can request to delete an
858	# allocation by a local human readable name or by a fedid. This finds
859	# both choices.
860	try:
861	if 'localname' in req['allocID']:
862	auth_attr = aid = req['allocID']['localname']
863	elif 'fedid' in req['allocID']:
864	aid = unicode(req['allocID']['fedid'])
865	auth_attr = req['allocID']['fedid']
866	else:
867	raise service_error(service_error.req,
868	"Only localnames and fedids are understood")
869	except KeyError:
870	raise service_error(service_error.req, "Badly formed request")
871
872	self.log.debug("[ReleaseAccess] deallocation requested for %s", aid)
873	# Confirm access
874	access_ok, proof = self.auth.check_attribute(fid, auth_attr,
875	with_proof=True)
876	if not access_ok:
877	self.log.debug("[ReleaseAccess] deallocation denied for %s", aid)
878	raise service_error(service_error.access, "Access Denied",
879	proof=proof)
880
881	# If there is an allocation in the state, delete it. Note the locking.
882	self.state_lock.acquire()
883	if aid in self.state:
884	self.log.debug("[ReleaseAccess] Found allocation for %s" %aid)
885	self.clear_allocation_authorization(aid)
886	del self.state[aid]
887	self.write_state()
888	self.state_lock.release()
889	# And remove the access cert
890	cf = "%s/%s.pem" % (self.certdir, aid)
891	self.log.debug("[ReleaseAccess] Removing %s" % cf)
892	os.remove(cf)
893	self.log.info("ReleaseAccess succeeded for %s" % fid)
894	return { 'allocID': req['allocID'], 'proof': proof.to_dict() }
895	else:
896	self.state_lock.release()
897	raise service_error(service_error.req, "No such allocation")

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