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source: fedd/federation/dragon_access.py @ f24fc8d

Last change on this file since f24fc8d was 6bedbdba, checked in by Ted Faber <faber@…>, 13 years ago
Split topdl and fedid out to different packages. Add differential installs
Property mode set to `100644`
File size: 15.7 KB

Rev	Line
[23dec62]	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	import time
	10
[ab847bc]	11	from threading import Thread, Lock
[23dec62]	12	from subprocess import Popen, call, PIPE, STDOUT
[6abed7b]	13	from access import access_base
[23dec62]	14
	15	from util import *
[6bedbdba]	16	from deter import fedid, generate_fedid
[d03c991]	17	from authorizer import authorizer, abac_authorizer
[23dec62]	18	from service_error import service_error
	19	from remote_service import xmlrpc_handler, soap_handler, service_caller
	20
	21	import httplib
	22	import tempfile
	23	from urlparse import urlparse
	24
[6bedbdba]	25	from deter import topdl
[23dec62]	26	import list_log
	27
	28
	29	# Make log messages disappear if noone configures a fedd logger
	30	class nullHandler(logging.Handler):
	31	def emit(self, record): pass
	32
	33	fl = logging.getLogger("fedd.access")
	34	fl.addHandler(nullHandler())
	35
[ee950c2]	36	class access(access_base):
[23dec62]	37	"""
	38	The implementation of access control based on mapping users to projects.
	39
	40	Users can be mapped to existing projects or have projects created
	41	dynamically. This implements both direct requests and proxies.
	42	"""
	43
	44	def __init__(self, config=None, auth=None):
	45	"""
	46	Initializer. Pulls parameters out of the ConfigParser's access section.
	47	"""
[6abed7b]	48	access_base.__init__(self, config, auth)
[23dec62]	49
	50	self.cli_dir = config.get("access", "cli_dir")
	51	self.axis2_home = config.get("access", "axis2_home")
	52	self.idc_url = config.get("access", "idc")
[36fec1b]	53	self.domain = config.get("access", "domain")
[6f82229]	54	self.duration = config.getint("access", "duration", 120)
[23dec62]	55
	56	self.access = { }
	57	if not (self.cli_dir and self.axis2_home and self.idc_url):
	58	self.log.error("Must specify all of cli_dir, axis2_home, " +\
	59	"idc in the [access] section of the configuration")
	60
[d03c991]	61	# authorization information
	62	self.auth_type = config.get('access', 'auth_type') \
[ee950c2]	63	or 'abac'
[d03c991]	64	self.auth_dir = config.get('access', 'auth_dir')
	65	accessdb = config.get("access", "accessdb")
	66	# initialize the authorization system
[ee950c2]	67	if self.auth_type == 'abac':
[d03c991]	68	self.auth = abac_authorizer(load=self.auth_dir)
	69	self.access = [ ]
	70	if accessdb:
	71	self.read_access(accessdb, self.make_repo)
	72	else:
	73	raise service_error(service_error.internal,
	74	"Unknown auth_type: %s" % self.auth_type)
[23dec62]	75
[7a011e9]	76	self.call_GetValue= service_caller('GetValue')
	77	self.call_SetValue= service_caller('SetValue')
	78
[23dec62]	79	self.soap_services = {\
	80	'RequestAccess': soap_handler("RequestAccess", self.RequestAccess),
	81	'ReleaseAccess': soap_handler("ReleaseAccess", self.ReleaseAccess),
	82	'StartSegment': soap_handler("StartSegment", self.StartSegment),
	83	'TerminateSegment': soap_handler("TerminateSegment",
	84	self.TerminateSegment),
	85	}
	86	self.xmlrpc_services = {\
	87	'RequestAccess': xmlrpc_handler('RequestAccess',
	88	self.RequestAccess),
	89	'ReleaseAccess': xmlrpc_handler('ReleaseAccess',
	90	self.ReleaseAccess),
	91	'StartSegment': xmlrpc_handler("StartSegment", self.StartSegment),
	92	'TerminateSegment': xmlrpc_handler('TerminateSegment',
	93	self.TerminateSegment),
	94	}
	95
[6abed7b]	96	@staticmethod
	97	def make_repo(s):
	98	"""
	99	Get the repo directory from an access line. This is removing the ()
	100	from the string.
	101	"""
	102	rv = s.strip()
	103	if rv.startswith('(') and rv.endswith(')'): return rv[1:-1]
	104	else: raise self.parse_error("Repo should be in parens");
[23dec62]	105
[9973d57]	106	# RequestAccess and ReleaseAccess come from the base class
[23dec62]	107
	108	def extract_parameters(self, top):
	109	"""
	110	DRAGON currently supports a fixed capacity link between two endpoints.
	111	Those endpoints may specify a VPN (or list or range) to use. This
	112	extracts the DRAGON endpoints and vpn preferences from the segments (as
	113	attributes) and the capacity of the connection as given by the
	114	substrate. The two endpoints VLAN choices are intersected to get set
	115	of VLANs that are acceptable (no VLAN requiremnets means any is
	116	acceptable).
	117	"""
	118	segments = filter(lambda x: isinstance(x, topdl.Segment), top.elements)
	119
	120	if len(segments) != 2 or len(top.substrates) != 1:
	121	raise service_error(service_error.req,
	122	"Requests to DRAGON must have exactlty two segments " +\
	123	"and one substrate")
	124
	125	ends = [ ]
	126	for s in segments:
	127	ep = s.get_attribute('dragon_endpoint')
	128	if not ep:
	129	raise service_error(service_error.req,
[69692a9]	130	"Missing DRAGON endpoint for %s" % s.id)
[23dec62]	131	v = s.get_attribute('vlans')
	132	vlans = None
	133	vset = set()
	134	# the vlans can be a single integer, a comma separated list or a
	135	# comma separated lists of dashed ranges. E.g 100 or 100,300 or
	136	# 100,300-305,400
	137	if v:
	138	if v.count(",") > 0 :
	139	vl = [ x.strip() for x in v.split(",") ]
	140	else:
	141	vl = [ v ]
	142	for v in vl:
	143	try:
	144	if v.count("-")> 0:
	145	f, t = v.split("-", 1)
	146	for i in range(int(f), int(t)+1):
	147	vset.add(i)
	148	else:
	149	vset.add(int(v))
	150	except ValueError:
	151	raise service_error(service_error.req,
	152	"VLAN tags must be integers (%s)" %s.name)
	153	if len(vset) > 0:
	154	if vlans: vlans &= vest
	155	else: vlans = vset
	156	ends.append(ep)
	157
	158
	159	sub = top.substrates[0]
	160	if sub.capacity:
	161	cap = int(sub.capacity.rate / 1000.0)
	162	if cap < 1: cap = 1
	163	else:
	164	cap = 100
	165
[36fec1b]	166
	167	# DRAGON's command line tool barfs if the source (ends[0]) is not in
	168	# the domain controlled by the IDC. This code ensures this situation.
	169	if self.domain and not ends[0].endswith(self.domain):
	170	hold = ends[0]
	171	for i, e in enumerate(ends):
	172	if i == 0: continue
	173	if e.endswith(self.domain):
	174	ends[0] = e
	175	ends[i] = hold
	176	break
	177	else:
	178	raise service_error(service_error.req,
	179	"No endpoint in my domain")
	180
	181
[23dec62]	182	return cap, ends[0], ends[1], vlans
	183
[6abed7b]	184	def oscars_create_vpn(self, repo, fr, to, cap, v, start, end, log):
[23dec62]	185
[6abed7b]	186	gri_re = re.compile("GRI:\s(.)", re.IGNORECASE)
	187	status_re = re.compile("Status:\s(.)", re.IGNORECASE)
	188
	189	cmd = ['env', 'AXIS2_HOME=%s' % self.axis2_home, './run.sh',
	190	'createReservation', '-repo', repo , '-url', self.idc_url,
	191	'-l2source', fr, '-l2dest', to, '-bwidth', "%s" % cap,
	192	'-vlan', "%s" % v, '-desc', 'fedd created connection',
	193	'-pathsetup', 'timer-automatic', '-start', "%d" % int(start),
	194	'-end', "%d" % int(end)]
	195	log.debug("[start_segment]: %s" % " ".join(cmd))
	196	if not self.create_debug:
	197	p = Popen(cmd, cwd=self.cli_dir, stdout=PIPE, stderr=STDOUT,
	198	close_fds=True)
	199	for line in p.stdout:
	200	m = status_re.match(line)
	201	if m:
	202	status = m.group(1)
	203	continue
	204	m = gri_re.match(line)
	205	if m:
	206	gri = m.group(1)
	207	continue
	208	rv = p.wait()
	209	else:
	210	rv = 0
	211	status = 'ACCEPTED'
	212	gri = 'debug_gri'
	213
	214	return (rv, status, gri)
	215
	216	def oscars_query_vpn(self, repo, gri, v, log):
[23dec62]	217	"""
[6abed7b]	218	Call the oscars query command from the command line and parse out the
	219	data to see if the current request succeeded. This is a lot of fiddly
	220	code to do a pretty simple thing.
[23dec62]	221	"""
	222	status_re = re.compile("Status:\s(.)", re.IGNORECASE)
	223	source_re = re.compile("Source\s+Endpoint:\s(.)", re.IGNORECASE)
	224	dest_re = re.compile("Destination\s+Endpoint:\s(.)", re.IGNORECASE)
	225	path_re = re.compile("Path:")
	226
[6abed7b]	227	cmd = ['env', 'AXIS2_HOME=%s' % self.axis2_home, './run.sh',
	228	'query', '-repo', repo , '-url', self.idc_url, '-gri', gri]
	229	log.debug("[start_segment]: %s" % " ".join(cmd))
	230	if not self.create_debug:
	231	# Really do the query
	232	p = Popen(cmd, cwd=self.cli_dir, stdout=PIPE, stderr=STDOUT,
	233	close_fds=True)
	234	in_path = False
	235	vpn1 = None
	236	vpn2 = None
	237	src = None
	238	dest = None
	239	for line in p.stdout:
	240	if not in_path:
	241	m = status_re.match(line)
	242	if m:
	243	status = m.group(1)
	244	continue
	245	m = source_re.match(line)
	246	if m:
	247	src = m.group(1)
	248	continue
	249	m = dest_re.match(line)
	250	if m:
	251	dest = m.group(1)
	252	continue
	253	m = path_re.match(line)
	254	if m:
	255	in_path = True
	256	if src and dest:
	257	vpn1_re = re.compile(
	258	"\s%s,\s\w+\s,\s(\d+)" % \
	259	src.replace("", "\"))
	260	vpn2_re = re.compile(
	261	"\s%s,\s\w+\s,\s(\d+)" % \
	262	dest.replace("", "\"))
	263	else:
	264	raise service_error(service_error.internal,
	265	"Strange output from query")
	266	else:
	267	m = vpn1_re.match(line)
	268	if m:
	269	vpn1 = m.group(1)
	270	continue
	271	m = vpn2_re.match(line)
	272	if m:
	273	vpn2 = m.group(1)
	274	continue
	275	rv = p.wait()
	276	# Make sure that OSCARS did what we expected.
	277	if vpn1 == vpn2:
	278	if v is not None:
	279	if int(vpn1) == v:
	280	vlan_no = int(v)
	281	else:
	282	raise service_error(service_error.federant,
	283	"Unexpected vlan assignment")
	284	else:
	285	vlan_no = int(v or 0)
	286	else:
	287	raise service_error(service_error.internal,
	288	"Different VPNs on DRAGON ends")
	289	log.debug("Status: %s" % status or "none")
	290	else:
	291	rv = 0
	292	status = 'ACTIVE'
	293	vlan_no = int(v or 1)
	294
	295	return (rv, status, vlan_no)
	296
	297
	298
	299	def start_segment(self, repo, fr, to, cap, vpns=None, start=None, end=None,
	300	log=None):
	301	"""
	302	Do the actual work of creating the dragon connecton.
	303	"""
	304	waiting_states = ('ACCEPTED', 'INSETUP', 'INCREATE', 'PENDING')
	305	if not log: log = self.log
	306
[23dec62]	307	if not vpns:
	308	vpns = [ None, None, None, None, None]
	309
	310	if not start:
	311	start = time.time()
	312	if not end:
[6f82229]	313	end = start + self.duration *60
[23dec62]	314
	315
	316	status = None
	317	gri = None
	318	rv = None
	319	vlan_no = None
	320	for v in vpns:
[6abed7b]	321	rv, status, gri = self.oscars_create_vpn(repo, fr, to, cap, v,
	322	start, end, log)
[23dec62]	323	# Reservation in progress. Poll the IDC until we know the outcome
[6abed7b]	324	while status in waiting_states:
	325	rv, status, vlan_no = self.oscars_query_vpn(repo, gri, v, log)
	326	if status in waiting_states:
[ab33158]	327	time.sleep(45)
[23dec62]	328	if status in ('ACTIVE', 'FINISHED', 'CANCELLED'):
	329	break
	330
	331	if (rv == 0 and gri and vlan_no and status == 'ACTIVE'):
[6abed7b]	332	self.log.debug("made reservation %s %s" % (gri, vlan_no))
[23dec62]	333	return gri, vlan_no
	334	else:
[69692a9]	335	raise service_error(service_error.federant,
	336	"Cannot make reservation")
[23dec62]	337
	338	def stop_segment(self, repo, gri, log=None):
[6abed7b]	339	"""
	340	Terminate the reservation.
	341	"""
[23dec62]	342	if not log: log = self.log
	343	cmd = ['env', 'AXIS2_HOME=%s' % self.axis2_home, './run.sh',
	344	'cancel', '-repo', repo , '-url', self.idc_url, '-gri', gri]
	345
	346
	347	self.log.debug("[stop_segment]: %s" % " ".join(cmd))
	348	if not self.create_debug:
	349	try:
	350	f = open("/dev/null", "w")
	351	call(cmd, cwd=self.cli_dir, stdout=f, stderr=f, close_fds=True)
	352	f.close()
[d3c8759]	353	except EnvironmentError, e:
[23dec62]	354	raise service_error(service_error.internal,
	355	"Failed to open /dev/null: %s" % e)
	356
[7a011e9]	357	def export_store_info(self, cf, vlan, connInfo):
	358	"""
	359	For the export requests in the connection info, install the peer names
	360	at the experiment controller via SetValue calls.
	361	"""
	362
	363	for c in connInfo:
	364	for p in [ p for p in c.get('parameter', []) \
	365	if p.get('type', '') == 'output']:
	366
	367	if p.get('name', '') != 'vlan_id':
	368	self.log.error("Unknown export parameter: %s" % \
	369	p.get('name'))
	370	continue
	371
	372	k = p.get('key', None)
	373	surl = p.get('store', None)
	374	if surl and k:
	375	value = "%s" % vlan
	376	req = { 'name': k, 'value': value }
	377	print "calling SetValue %s %s" % (surl, req)
	378	self.call_SetValue(surl, req, cf)
	379	else:
	380	self.log.error("Bad export request: %s" % p)
	381
[6abed7b]	382	def initialize_experiment_info(self, aid, ename):
	383	repo = None
	384	self.state_lock.acquire()
	385	if aid in self.state:
	386	repo = self.state[aid].get('user', None)
	387	self.state[aid]['log'] = [ ]
	388	# Create a logger that logs to the experiment's state object as
	389	# well as to the main log file.
	390	alloc_log = logging.getLogger('fedd.access.%s' % ename)
	391	h = logging.StreamHandler(
	392	list_log.list_log(self.state[aid]['log']))
	393	# XXX: there should be a global one of these rather than
	394	# repeating the code.
	395	h.setFormatter(logging.Formatter(
	396	"%(asctime)s %(name)s %(message)s", '%d %b %y %H:%M:%S'))
	397	alloc_log.addHandler(h)
	398	self.write_state()
	399	self.state_lock.release()
	400	return (repo, alloc_log)
	401
[e83f2f2]	402	def finalize_experiment(self, topo, vlan_no, gri, aid, alloc_id, proof):
[7a011e9]	403	"""
[6abed7b]	404	Place the relevant information in the global state block, and prepare
	405	the response.
[7a011e9]	406	"""
[6abed7b]	407	rtopo = topo.clone()
	408	for s in rtopo.substrates:
	409	s.set_attribute('vlan', vlan_no)
	410	s.set_attribute('gri', gri)
[7a011e9]	411
[6abed7b]	412	# Grab the log (this is some anal locking, but better safe than
	413	# sorry)
	414	self.state_lock.acquire()
	415	self.state[aid]['gri'] = gri
	416	logv = "".join(self.state[aid]['log'])
	417	# It's possible that the StartSegment call gets retried (!).
	418	# if the 'started' key is in the allocation, we'll return it rather
	419	# than redo the setup.
	420	self.state[aid]['started'] = {
	421	'allocID': alloc_id,
	422	'allocationLog': logv,
	423	'segmentdescription': {
	424	'topdldescription': rtopo.to_dict()
	425	},
[e83f2f2]	426	'proof': proof.to_dict(),
[6abed7b]	427	}
	428	retval = copy.deepcopy(self.state[aid]['started'])
	429	self.write_state()
	430	self.state_lock.release()
[7a011e9]	431
[6abed7b]	432	return retval
[7a011e9]	433
[23dec62]	434	def StartSegment(self, req, fid):
	435	err = None # Any service_error generated after tmpdir is created
	436	rv = None # Return value from segment creation
	437
	438	try:
	439	req = req['StartSegmentRequestBody']
[6abed7b]	440	topref = req['segmentdescription']['topdldescription']
[23dec62]	441	except KeyError:
	442	raise service_error(server_error.req, "Badly formed request")
	443
	444	auth_attr = req['allocID']['fedid']
	445	aid = "%s" % auth_attr
	446	attrs = req.get('fedAttr', [])
[e83f2f2]	447	access_ok, proof = self.auth.check_attribute(fid, auth_attr,
	448	with_proof=True)
	449	if not access_ok:
[23dec62]	450	raise service_error(service_error.access, "Access denied")
[7a011e9]	451	else:
[1627c3d]	452	# See if this is a replay of an earlier succeeded StartSegment -
	453	# sometimes SSL kills 'em. If so, replay the response rather than
	454	# redoing the allocation.
	455	self.state_lock.acquire()
[ab847bc]	456	retval = self.state[aid].get('started', None)
[1627c3d]	457	self.state_lock.release()
	458	if retval:
	459	self.log.warning("Duplicate StartSegment for %s: " % aid + \
	460	"replaying response")
	461	return retval
	462
	463	certfile = "%s/%s.pem" % (self.certdir, aid)
[23dec62]	464
[6abed7b]	465	if topref:
	466	topo = topdl.Topology(**topref)
[23dec62]	467	else:
	468	raise service_error(service_error.req,
	469	"Request missing segmentdescription'")
	470
[7a011e9]	471	connInfo = req.get('connection', [])
	472
[23dec62]	473	cap, src, dest, vlans = self.extract_parameters(topo)
	474
	475	for a in attrs:
	476	if a['attribute'] == 'experiment_name':
	477	ename = a['value']
[6abed7b]	478	break
	479	else: ename = aid
	480
	481	repo, alloc_log = self.initialize_experiment_info(aid, ename)
[23dec62]	482
	483	if not repo:
	484	raise service_error(service_error.internal,
[6abed7b]	485	"Can't find creation user for %s" % aid)
[23dec62]	486
[68bb551]	487	gri, vlan_no = self.start_segment(repo, src, dest, cap, vlans,
	488	log=alloc_log)
[23dec62]	489
[7a011e9]	490	self.export_store_info(certfile, vlan_no, connInfo)
	491
[ab847bc]	492
[23dec62]	493	if gri:
[6abed7b]	494	return self.finalize_experiment(topo, vlan_no, gri, aid,
[e83f2f2]	495	req['allocID'], proof)
[23dec62]	496	elif err:
	497	raise service_error(service_error.federant,
	498	"Swapin failed: %s" % err)
	499	else:
	500	raise service_error(service_error.federant, "Swapin failed")
	501
	502	def TerminateSegment(self, req, fid):
	503	try:
	504	req = req['TerminateSegmentRequestBody']
	505	except KeyError:
	506	raise service_error(server_error.req, "Badly formed request")
	507
	508	auth_attr = req['allocID']['fedid']
	509	aid = "%s" % auth_attr
[ab33158]	510
	511	self.log.debug("Terminate request for %s" %aid)
[23dec62]	512	attrs = req.get('fedAttr', [])
[e83f2f2]	513	access_ok, proof = self.auth.check_attribute(fid, auth_attr,
	514	with_proof=True)
	515	if not access_ok:
[23dec62]	516	raise service_error(service_error.access, "Access denied")
	517
	518	self.state_lock.acquire()
	519	if self.state.has_key(aid):
	520	gri = self.state[aid].get('gri', None)
	521	user = self.state[aid].get('user', None)
	522	else:
	523	gri = None
	524	user = None
	525	self.state_lock.release()
[ab33158]	526	self.log.debug("Stop segment for user: %s gre %s" %(user, gri))
[23dec62]	527
	528	if not gri:
	529	raise service_error(service_error.internal,
	530	"Can't find gri for %s" % aid)
	531
	532	if not user:
	533	raise service_error(service_error.internal,
	534	"Can't find creation user for %s" % aid)
[ab33158]	535
	536	self.log.debug("Stop segment for GRI: %s" %gri)
[23dec62]	537	self.stop_segment(user, gri)
[e83f2f2]	538	return { 'allocID': req['allocID'], 'proof': proof.to_dict() }

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