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source: fedd/fedd_access.py @ 0a20ef8

axis_examplecompt_changesinfo-opsversion-1.30version-2.00version-3.01version-3.02

Last change on this file since 0a20ef8 was 40eab39, checked in by Ted Faber <faber@…>, 16 years ago
Better debugging logging for acess decisions. Rename some attributes to a more general naming convention.
Property mode set to `100644`
File size: 25.0 KB

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1	#!/usr/local/bin/python
2
3	import os,sys
4	import re
5	import string
6	import copy
7	import pickle
8	import logging
9
10	from threading import *
11
12	from fedd_services import *
13	from fedd_util import *
14	from fedd_allocate_project import *
15	from fedd_access_project import access_project
16	from fedid import fedid, generate_fedid
17	from authorizer import authorizer
18	import parse_detail
19	from service_error import *
20	from remote_service import xmlrpc_handler, soap_handler, service_caller
21
22
23	# Make log messages disappear if noone configures a fedd logger
24	class nullHandler(logging.Handler):
25	def emit(self, record): pass
26
27	fl = logging.getLogger("fedd.access")
28	fl.addHandler(nullHandler())
29
30	class fedd_access:
31	"""
32	The implementation of access control based on mapping users to projects.
33
34	Users can be mapped to existing projects or have projects created
35	dynamically. This implements both direct requests and proxies.
36	"""
37
38	class parse_error(RuntimeError): pass
39
40	bool_attrs = ("project_priority", "allow_proxy")
41	emulab_attrs = ("boss", "ops", "domain", "fileserver", "eventserver")
42	id_attrs = ("testbed", "proxy",
43	"proxy_cert_file", "proxy_cert_pwd", "proxy_trusted_certs",
44	"project_allocation_uri", "project_allocation_cert_file",
45	"project_allocation_cert_pwd", "project_allocation_trusted_certs")
46	id_list_attrs = ("restricted",)
47
48	proxy_RequestAccess= \
49	service_caller('RequestAccess', 'getfeddPortType',
50	feddServiceLocator, RequestAccessRequestMessage,
51	'RequestAccessRequestBody')
52
53	proxy_ReleaseAccess= \
54	service_caller('ReleaseAccess', 'getfeddPortType',
55	feddServiceLocator, ReleaseAccessRequestMessage,
56	'ReleaseAccessRequestBody')
57
58	def __init__(self, config=None, auth=None):
59	"""
60	Initializer. Pulls parameters out of the ConfigParser's access section.
61	"""
62
63	# Make sure that the configuration is in place
64	if config:
65	if not config.has_section("access"):
66	config.add_section("access")
67	if not config.has_section("globals"):
68	config.add_section("globals")
69	else:
70	raise RunTimeError("No config to fedd_access")
71
72	# Create instance attributes from the static lists
73	for a in fedd_access.bool_attrs:
74	if config.has_option("access", a):
75	setattr(self, a, config.get("access", a))
76	else:
77	setattr(self, a, False)
78
79	for a in fedd_access.emulab_attrs + fedd_access.id_attrs:
80	if config.has_option("access", a):
81	setattr(self, a, config.get("access",a))
82	else:
83	setattr(self, a, None)
84
85	self.attrs = { }
86	self.access = { }
87	self.restricted = [ ]
88	self.fedid_category = { }
89	self.projects = { }
90	self.keys = { }
91	self.allocation = { }
92	self.state = {
93	'projects': self.projects,
94	'allocation' : self.allocation,
95	'keys' : self.keys
96	}
97	self.log = logging.getLogger("fedd.access")
98	set_log_level(config, "access", self.log)
99	self.state_lock = Lock()
100
101	if auth: self.auth = auth
102	else:
103	self.log.error(\
104	"[access]: No authorizer initialized, creating local one.")
105	auth = authorizer()
106
107	self.fedid_default = "testbed"
108	if config.has_option("access", "accessdb"):
109	self.read_access(config.get("access", "accessdb"))
110
111	self.state_filename = config.get("access", "access_state", "")
112	self.read_state()
113	# Certs are promoted from the generic to the specific, so without a
114	# specific proxy certificate, the main certificates are used for
115	# proxy interactions. If no dynamic project certificates, then
116	# proxy certs are used, and if none of those the main certs.
117
118	if config.has_option("globals", "proxy_cert_file"):
119	if not self.project_allocation_cert_file:
120	self.project_allocation_cert_file = \
121	config.get("globals", "proxy_cert_file")
122	if config.has_option("globals", "proxy_cert_pwd"):
123	self.project_allocation_cert_pwd = \
124	config.get("globals", "proxy_cert_pwd")
125
126	if config.has_option("globals", "proxy_trusted_certs"):
127	if not self.project_allocation_trusted_certs:
128	self.project_allocation_trusted_certs =\
129	config.get("globals", proxy_trusted_certs)
130
131	if config.has_option("globals", "cert_file"):
132	has_pwd = config.has_option("globals", "cert_pwd")
133	if not self.project_allocation_cert_file:
134	self.project_allocation_cert_file = \
135	config.get("globals", "cert_file")
136	if has_pwd:
137	self.project_allocation_cert_pwd = \
138	config.get("globals", "cert_pwd")
139	if not self.proxy_cert_file:
140	self.proxy_cert_file = config.get("globals", "cert_file")
141	if has_pwd:
142	self.proxy_cert_pwd = config.get("globals", "cert_pwd")
143
144	if config.get("globals", "trusted_certs"):
145	if not self.proxy_trusted_certs:
146	self.proxy_trusted_certs = \
147	config.get("globals", "trusted_certs")
148	if not self.project_allocation_trusted_certs:
149	self.project_allocation_trusted_certs = \
150	config.get("globals", "trusted_certs")
151
152	proj_certs = (self.project_allocation_cert_file,
153	self.project_allocation_trusted_certs,
154	self.project_allocation_cert_pwd)
155
156	self.soap_services = {\
157	'RequestAccess': soap_handler(\
158	RequestAccessRequestMessage.typecode,\
159	self.RequestAccess, RequestAccessResponseMessage,\
160	"RequestAccessResponseBody"), \
161	'ReleaseAccess': soap_handler(\
162	ReleaseAccessRequestMessage.typecode,\
163	self.ReleaseAccess, ReleaseAccessResponseMessage,\
164	"ReleaseAccessResponseBody")\
165	}
166	self.xmlrpc_services = {\
167	'RequestAccess': xmlrpc_handler(\
168	self.RequestAccess, "RequestAccessResponseBody"),\
169	'ReleaseAccess': xmlrpc_handler(\
170	self.ReleaseAccess, "ReleaseAccessResponseBody")\
171	}
172
173
174	if not config.has_option("access", "project_allocation_uri"):
175	self.allocate_project = \
176	fedd_allocate_project_local(config, auth)
177	else:
178	self.allocate_project = \
179	fedd_allocate_project_remote(config, auth)
180
181	# If the project allocator exports services, put them in this object's
182	# maps so that classes that instantiate this can call the services.
183	self.soap_services.update(self.allocate_project.soap_services)
184	self.xmlrpc_services.update(self.allocate_project.xmlrpc_services)
185
186
187	def read_access(self, config):
188	"""
189	Read a configuration file and set internal parameters.
190
191	The format is more complex than one might hope. The basic format is
192	attribute value pairs separated by colons(:) on a signle line. The
193	attributes in bool_attrs, emulab_attrs and id_attrs can all be set
194	directly using the name: value syntax. E.g.
195	boss: hostname
196	sets self.boss to hostname. In addition, there are access lines of the
197	form (tb, proj, user) -> (aproj, auser) that map the first tuple of
198	names to the second for access purposes. Names in the key (left side)
199	can include "<NONE> or <ANY>" to act as wildcards or to require the
200	fields to be empty. Similarly aproj or auser can be <SAME> or
201	<DYNAMIC> indicating that either the matching key is to be used or a
202	dynamic user or project will be created. These names can also be
203	federated IDs (fedid's) if prefixed with fedid:. Finally, the aproj
204	can be followed with a colon-separated list of node types to which that
205	project has access (or will have access if dynamic).
206	Testbed attributes outside the forms above can be given using the
207	format attribute: name value: value. The name is a single word and the
208	value continues to the end of the line. Empty lines and lines startin
209	with a # are ignored.
210
211	Parsing errors result in a self.parse_error exception being raised.
212	"""
213	lineno=0
214	name_expr = "["+string.ascii_letters + string.digits + "\.\-_]+"
215	fedid_expr = "fedid:[" + string.hexdigits + "]+"
216	key_name = "(<ANY>\|<NONE>\|"+fedid_expr + "\|"+ name_expr + ")"
217	access_proj = "(<DYNAMIC>(?::" + name_expr +")*\|"+ \
218	"<SAME>" + "(?::" + name_expr + ")*\|" + \
219	fedid_expr + "(?::" + name_expr + ")*\|" + \
220	name_expr + "(?::" + name_expr + ")*)"
221	access_name = "(<DYNAMIC>\|<SAME>\|" + fedid_expr + "\|"+ name_expr + ")"
222
223	restricted_re = re.compile("restricted:\s(.)", re.IGNORECASE)
224	attr_re = re.compile('attribute:\s([\._\-a-z0-9]+)\s+value:\s(.*)',
225	re.IGNORECASE)
226	access_re = re.compile('\('+key_name+'\s,\s'+key_name+'\s,\s'+
227	key_name+'\s\)\s->\s\('+access_proj + '\s,\s*' +
228	access_name + '\s,\s' + access_name + '\s*\)', re.IGNORECASE)
229
230	def parse_name(n):
231	if n.startswith('fedid:'): return fedid(hexstr=n[len('fedid:'):])
232	else: return n
233
234	def auth_name(n):
235	if isinstance(n, basestring):
236	if n =='<any>' or n =='<none>': return None
237	else: return unicode(n)
238	else:
239	return n
240
241	f = open(config, "r");
242	for line in f:
243	lineno += 1
244	line = line.strip();
245	if len(line) == 0 or line.startswith('#'):
246	continue
247
248	# Extended (attribute: x value: y) attribute line
249	m = attr_re.match(line)
250	if m != None:
251	attr, val = m.group(1,2)
252	self.attrs[attr] = val
253	continue
254
255	# Restricted entry
256	m = restricted_re.match(line)
257	if m != None:
258	val = m.group(1)
259	self.restricted.append(val)
260	continue
261
262	# Access line (t, p, u) -> (ap, cu, su) line
263	m = access_re.match(line)
264	if m != None:
265	access_key = tuple([ parse_name(x) for x in m.group(1,2,3)])
266	auth_key = tuple([ auth_name(x) for x in access_key])
267	aps = m.group(4).split(":");
268	if aps[0] == 'fedid:':
269	del aps[0]
270	aps[0] = fedid(hexstr=aps[0])
271
272	cu = parse_name(m.group(5))
273	su = parse_name(m.group(6))
274
275	access_val = (access_project(aps[0], aps[1:]),
276	parse_name(m.group(5)), parse_name(m.group(6)))
277
278	self.access[access_key] = access_val
279	self.auth.set_attribute(auth_key, "access")
280	continue
281
282	# Nothing matched to here: unknown line - raise exception
283	f.close()
284	raise self.parse_error("Unknown statement at line %d of %s" % \
285	(lineno, config))
286	f.close()
287
288
289	def dump_state(self):
290	"""
291	Dump the state read from a configuration file. Mostly for debugging.
292	"""
293	for a in fedd_access.bool_attrs:
294	print "%s: %s" % (a, getattr(self, a ))
295	for a in fedd_access.emulab_attrs + fedd_access.id_attrs:
296	print "%s: %s" % (a, getattr(self, a))
297	for k, v in self.attrs.iteritems():
298	print "%s %s" % (k, v)
299	print "Access DB:"
300	for k, v in self.access.iteritems():
301	print "%s %s" % (k, v)
302	print "Trust DB:"
303	for k, v in self.fedid_category.iteritems():
304	print "%s %s" % (k, v)
305	print "Restricted: %s" % str(',').join(sorted(self.restricted))
306
307	def get_users(self, obj):
308	"""
309	Return a list of the IDs of the users in dict
310	"""
311	if obj.has_key('user'):
312	return [ unpack_id(u['userID']) \
313	for u in obj['user'] if u.has_key('userID') ]
314	else:
315	return None
316
317	def write_state(self):
318	try:
319	f = open(self.state_filename, 'w')
320	pickle.dump(self.state, f)
321	except IOError, e:
322	self.log.error("Can't write file %s: %s" % \
323	(self.state_filename, e))
324	except pickle.PicklingError, e:
325	self.log.error("Pickling problem: %s" % e)
326	except TypeError, e:
327	self.log.error("Pickling problem (TypeError): %s" % e)
328
329
330	def read_state(self):
331	"""
332	Read a new copy of access state. Old state is overwritten.
333
334	State format is a simple pickling of the state dictionary.
335	"""
336	try:
337	f = open(self.state_filename, "r")
338	self.state = pickle.load(f)
339
340	self.allocation = self.state['allocation']
341	self.projects = self.state['projects']
342	self.keys = self.state['keys']
343
344	self.log.debug("[read_state]: Read state from %s" % \
345	self.state_filename)
346	except IOError, e:
347	self.log.warning("[read_state]: No saved state: Can't open %s: %s"\
348	% (self.state_filename, e))
349	except EOFError, e:
350	self.log.warning("[read_state]: Empty or damaged state file: %s:"\
351	% self.state_filename)
352	except pickle.UnpicklingError, e:
353	self.log.warning(("[read_state]: No saved state: " + \
354	"Unpickling failed: %s") % e)
355
356	# Add the ownership attributes to the authorizer. Note that the
357	# indices of the allocation dict are strings, but the attributes are
358	# fedids, so there is a conversion.
359	for k in self.allocation.keys():
360	for o in self.allocation[k].get('owners', []):
361	self.auth.set_attribute(o, fedid(hexstr=k))
362
363
364	def permute_wildcards(self, a, p):
365	"""Return a copy of a with various fields wildcarded.
366
367	The bits of p control the wildcards. A set bit is a wildcard
368	replacement with the lowest bit being user then project then testbed.
369	"""
370	if p & 1: user = ["<any>"]
371	else: user = a[2]
372	if p & 2: proj = "<any>"
373	else: proj = a[1]
374	if p & 4: tb = "<any>"
375	else: tb = a[0]
376
377	return (tb, proj, user)
378
379	def find_access(self, search):
380	"""
381	Search the access DB for a match on this tuple. Return the matching
382	access tuple and the user that matched.
383
384	NB, if the initial tuple fails to match we start inserting wildcards in
385	an order determined by self.project_priority. Try the list of users in
386	order (when wildcarded, there's only one user in the list).
387	"""
388	if self.project_priority: perm = (0, 1, 2, 3, 4, 5, 6, 7)
389	else: perm = (0, 2, 1, 3, 4, 6, 5, 7)
390
391	for p in perm:
392	s = self.permute_wildcards(search, p)
393	# s[2] is None on an anonymous, unwildcarded request
394	if s[2] != None:
395	for u in s[2]:
396	if self.access.has_key((s[0], s[1], u)):
397	return (self.access[(s[0], s[1], u)], u)
398	else:
399	if self.access.has_key(s):
400	return (self.access[s], None)
401	return None, None
402
403	def lookup_access(self, req, fid):
404	"""
405	Determine the allowed access for this request. Return the access and
406	which fields are dynamic.
407
408	The fedid is needed to construct the request
409	"""
410	# Search keys
411	tb = None
412	project = None
413	user = None
414	# Return values
415	rp = access_project(None, ())
416	ru = None
417
418	if req.has_key('project'):
419	p = req['project']
420	if p.has_key('name'):
421	project = unpack_id(p['name'])
422	user = self.get_users(p)
423	else:
424	user = self.get_users(req)
425
426	user_fedids = [ u for u in user if isinstance(u, fedid)]
427	# Determine how the caller is representing itself. If its fedid shows
428	# up as a project or a singleton user, let that stand. If neither the
429	# usernames nor the project name is a fedid, the caller is a testbed.
430	if project and isinstance(project, fedid):
431	if project == fid:
432	# The caller is the project (which is already in the tuple
433	# passed in to the authorizer)
434	owners = user_fedids
435	owners.append(project)
436	else:
437	raise service_error(service_error.req,
438	"Project asserting different fedid")
439	else:
440	if fid not in user_fedids:
441	tb = fid
442	owners = user_fedids
443	owners.append(fid)
444	else:
445	if len(fedids) > 1:
446	raise service_error(service_error.req,
447	"User asserting different fedid")
448	else:
449	# Which is a singleton
450	owners = user_fedids
451	# Confirm authorization
452	for u in user:
453	self.log.debug("[lookup_access] Checking access for %s" % \
454	((tb, project, u),))
455	if self.auth.check_attribute((tb, project, u), 'access'):
456	self.log.debug("[lookup_access] Access granted")
457	break
458	else:
459	self.log.debug("[lookup_access] Access Denied")
460	else:
461	raise service_error(service_error.access, "Access denied")
462
463	# This maps a valid user to the Emulab projects and users to use
464	found, user_match = self.find_access((tb, project, user))
465
466	if found == None:
467	raise service_error(service_error.access,
468	"Access denied - cannot map access")
469
470	# resolve <dynamic> and <same> in found
471	dyn_proj = False
472	dyn_create_user = False
473	dyn_service_user = False
474
475	if found[0].name == "<same>":
476	if project != None:
477	rp.name = project
478	else :
479	raise service_error(\
480	service_error.server_config,
481	"Project matched <same> when no project given")
482	elif found[0].name == "<dynamic>":
483	rp.name = None
484	dyn_proj = True
485	else:
486	rp.name = found[0].name
487	rp.node_types = found[0].node_types;
488
489	if found[1] == "<same>":
490	if user_match == "<any>":
491	if user != None: rcu = user[0]
492	else: raise service_error(\
493	service_error.server_config,
494	"Matched <same> on anonymous request")
495	else:
496	rcu = user_match
497	elif found[1] == "<dynamic>":
498	rcu = None
499	dyn_create_user = True
500
501	if found[2] == "<same>":
502	if user_match == "<any>":
503	if user != None: rsu = user[0]
504	else: raise service_error(\
505	service_error.server_config,
506	"Matched <same> on anonymous request")
507	else:
508	rsu = user_match
509	elif found[2] == "<dynamic>":
510	rsu = None
511	dyn_service_user = True
512
513	return (rp, rcu, rsu), (dyn_create_user, dyn_service_user, dyn_proj),\
514	owners
515
516	def build_response(self, alloc_id, ap):
517	"""
518	Create the SOAP response.
519
520	Build the dictionary description of the response and use
521	fedd_utils.pack_soap to create the soap message. NB that alloc_id is
522	a fedd_services_types.IDType_Holder pulled from the incoming message.
523	ap is the allocate project message returned from a remote project
524	allocation (even if that allocation was done locally).
525	"""
526	# Because alloc_id is already a fedd_services_types.IDType_Holder,
527	# there's no need to repack it
528	msg = {
529	'allocID': alloc_id,
530	'emulab': {
531	'domain': self.domain,
532	'boss': self.boss,
533	'ops': self.ops,
534	'fileServer': self.fileserver,
535	'eventServer': self.eventserver,
536	'project': ap['project']
537	},
538	}
539	if len(self.attrs) > 0:
540	msg['emulab']['fedAttr'] = \
541	[ { 'attribute': x, 'value' : y } \
542	for x,y in self.attrs.iteritems()]
543	return msg
544
545	def RequestAccess(self, req, fid):
546	"""
547	Handle the access request. Proxy if not for us.
548
549	Parse out the fields and make the allocations or rejections if for us,
550	otherwise, assuming we're willing to proxy, proxy the request out.
551	"""
552
553	# The dance to get into the request body
554	if req.has_key('RequestAccessRequestBody'):
555	req = req['RequestAccessRequestBody']
556	else:
557	raise service_error(service_error.req, "No request!?")
558
559	if req.has_key('destinationTestbed'):
560	dt = unpack_id(req['destinationTestbed'])
561
562	if dt == None or dt == self.testbed:
563	# Request for this fedd
564	found, dyn, owners = self.lookup_access(req, fid)
565	restricted = None
566	ap = None
567
568	# If this is a request to export a project and the access project
569	# is not the project to export, access denied.
570	if req.has_key('exportProject'):
571	ep = unpack_id(req['exportProject'])
572	if ep != found[0].name:
573	raise service_error(service_error.access,
574	"Cannot export %s" % ep)
575
576	# Check for access to restricted nodes
577	if req.has_key('resources') and req['resources'].has_key('node'):
578	resources = req['resources']
579	restricted = [ t for n in resources['node'] \
580	if n.has_key('hardware') \
581	for t in n['hardware'] \
582	if t in self.restricted ]
583	inaccessible = [ t for t in restricted \
584	if t not in found[0].node_types]
585	if len(inaccessible) > 0:
586	raise service_error(service_error.access,
587	"Access denied (nodetypes %s)" % \
588	str(', ').join(inaccessible))
589	# These collect the keys for the two roles into single sets, one
590	# for creation and one for service. The sets are a simple way to
591	# eliminate duplicates
592	create_ssh = set([ x['sshPubkey'] \
593	for x in req['createAccess'] \
594	if x.has_key('sshPubkey')])
595
596	service_ssh = set([ x['sshPubkey'] \
597	for x in req['serviceAccess'] \
598	if x.has_key('sshPubkey')])
599
600	if len(create_ssh) > 0 and len(service_ssh) >0:
601	if dyn[1]:
602	# Compose the dynamic project request
603	# (only dynamic, dynamic currently allowed)
604	preq = { 'AllocateProjectRequestBody': \
605	{ 'project' : {\
606	'user': [ \
607	{ \
608	'access': [ { 'sshPubkey': s } \
609	for s in service_ssh ],
610	'role': "serviceAccess",\
611	}, \
612	{ \
613	'access': [ { 'sshPubkey': s } \
614	for s in create_ssh ],
615	'role': "experimentCreation",\
616	}, \
617	], \
618	}\
619	}\
620	}
621	if restricted != None and len(restricted) > 0:
622	preq['AllocateProjectRequestBody']['resources'] = \
623	[ {'node': { 'hardware' : [ h ] } } \
624	for h in restricted ]
625	ap = self.allocate_project.dynamic_project(preq)
626	else:
627	preq = {'StaticProjectRequestBody' : \
628	{ 'project': \
629	{ 'name' : { 'localname' : found[0].name },\
630	'user' : [ \
631	{\
632	'userID': { 'localname' : found[1] }, \
633	'access': [ { 'sshPubkey': s }
634	for s in create_ssh ],
635	'role': 'experimentCreation'\
636	},\
637	{\
638	'userID': { 'localname' : found[2] }, \
639	'access': [ { 'sshPubkey': s }
640	for s in service_ssh ],
641	'role': 'serviceAccess'\
642	},\
643	]}\
644	}\
645	}
646	if restricted != None and len(restricted) > 0:
647	preq['StaticProjectRequestBody']['resources'] = \
648	[ {'node': { 'hardware' : [ h ] } } \
649	for h in restricted ]
650	ap = self.allocate_project.static_project(preq)
651	else:
652	raise service_error(service_error.req,
653	"SSH access parameters required")
654	# keep track of what's been added
655	allocID, alloc_cert = generate_fedid(subj="alloc", log=self.log)
656	aid = unicode(allocID)
657
658	self.state_lock.acquire()
659	self.allocation[aid] = { }
660	if dyn[1]:
661	try:
662	pname = ap['project']['name']['localname']
663	except KeyError:
664	self.state_lock.release()
665	raise service_error(service_error.internal,
666	"Misformed allocation response?")
667	if self.projects.has_key(pname): self.projects[pname] += 1
668	else: self.projects[pname] = 1
669	self.allocation[aid]['project'] = pname
670
671	self.allocation[aid]['keys'] = [ ]
672
673	try:
674	for u in ap['project']['user']:
675	uname = u['userID']['localname']
676	for k in [ k['sshPubkey'] for k in u['access'] \
677	if k.has_key('sshPubkey') ]:
678	kv = "%s:%s" % (uname, k)
679	if self.keys.has_key(kv): self.keys[kv] += 1
680	else: self.keys[kv] = 1
681	self.allocation[aid]['keys'].append((uname, k))
682	except KeyError:
683	self.state_lock.release()
684	raise service_error(service_error.internal,
685	"Misformed allocation response?")
686
687	self.allocation[aid]['owners'] = owners
688	self.write_state()
689	self.state_lock.release()
690	for o in owners:
691	self.auth.set_attribute(o, allocID)
692	resp = self.build_response({ 'fedid': allocID } , ap)
693	return resp
694	else:
695	if self.allow_proxy:
696	resp = self.proxy_RequestAccess.call_service(dt, req,
697	self.proxy_cert_file, self.proxy_cert_pwd,
698	self.proxy_trusted_certs)
699	if resp.has_key('RequestAccessResponseBody'):
700	return resp['RequestAccessResponseBody']
701	else:
702	return None
703	else:
704	raise service_error(service_error.access,
705	"Access proxying denied")
706
707	def ReleaseAccess(self, req, fid):
708	# The dance to get into the request body
709	if req.has_key('ReleaseAccessRequestBody'):
710	req = req['ReleaseAccessRequestBody']
711	else:
712	raise service_error(service_error.req, "No request!?")
713
714	if req.has_key('destinationTestbed'):
715	dt = unpack_id(req['destinationTestbed'])
716	else:
717	dt = None
718
719	if dt == None or dt == self.testbed:
720	# Local request
721	try:
722	if req['allocID'].has_key('localname'):
723	auth_attr = aid = req['allocID']['localname']
724	elif req['allocID'].has_key('fedid'):
725	aid = unicode(req['allocID']['fedid'])
726	auth_attr = req['allocID']['fedid']
727	else:
728	raise service_error(service_error.req,
729	"Only localnames and fedids are understood")
730	except KeyError:
731	raise service_error(service_error.req, "Badly formed request")
732
733	if not self.auth.check_attribute(fid, auth_attr):
734	raise service_error(service_error.access, "Access Denied")
735
736	# If we know this allocation, reduce the reference counts and
737	# remove the local allocations. Otherwise report an error. If
738	# there is an allocation to delete, del_users will be a dictonary
739	# of sets where the key is the user that owns the keys in the set.
740	# We use a set to avoid duplicates. del_project is just the name
741	# of any dynamic project to delete. We're somewhat lazy about
742	# deleting authorization attributes. Having access to something
743	# that doesn't exist isn't harmful.
744	del_users = { }
745	del_project = None
746	if self.allocation.has_key(aid):
747	self.state_lock.acquire()
748	for k in self.allocation[aid]['keys']:
749	kk = "%s:%s" % k
750	self.keys[kk] -= 1
751	if self.keys[kk] == 0:
752	if not del_users.has_key(k[0]):
753	del_users[k[0]] = set()
754	del_users[k[0]].add(k[1])
755	del self.keys[kk]
756
757	if self.allocation[aid].has_key('project'):
758	pname = self.allocation[aid]['project']
759	self.projects[pname] -= 1
760	if self.projects[pname] == 0:
761	del_project = pname
762	del self.projects[pname]
763
764	del self.allocation[aid]
765	self.write_state()
766	self.state_lock.release()
767	# If we actually have resources to deallocate, prepare the call.
768	if del_project or del_users:
769	msg = { 'project': { }}
770	if del_project:
771	msg['project']['name']= {'localname': del_project}
772	users = [ ]
773	for u in del_users.keys():
774	users.append({ 'userID': { 'localname': u },\
775	'access' : \
776	[ {'sshPubkey' : s } for s in del_users[u]]\
777	})
778	if users:
779	msg['project']['user'] = users
780	if self.allocate_project.release_project:
781	msg = { 'ReleaseProjectRequestBody' : msg}
782	self.allocate_project.release_project(msg)
783	return { 'allocID': req['allocID'] }
784	else:
785	raise service_error(service_error.req, "No such allocation")
786
787	else:
788	if self.allow_proxy:
789	resp = self.proxy_ReleaseAccess.call_service(dt, req,
790	self.proxy_cert_file, self.proxy_cert_pwd,
791	self.proxy_trusted_certs)
792	if resp.has_key('ReleaseAccessResponseBody'):
793	return resp['ReleaseAccessResponseBody']
794	else:
795	return None
796	else:
797	raise service_error(service_error.access,
798	"Access proxying denied")
799
800

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