2 # vim:set ts=4 sw=4 expandtab:
7 # NodeManager plugin for creating credentials in slivers
8 # (*) empower slivers to make API calls throught hmac
9 # (*) also create a ssh key - used by the OMF resource controller
10 # for authenticating itself with its Experiment Controller
11 # xxx todo : a config option for turning these 2 things on or off ?
14 Sliver authentication support for NodeManager.
28 logger.log("sliverauth: (dummy) plugin starting up...")
30 def GetSlivers(data, config, plc):
31 if 'OVERRIDES' in dir(config):
32 if config.OVERRIDES.get('sliverauth') == '-1':
33 logger.log("sliverauth: Disabled", 2)
36 if 'slivers' not in data:
37 logger.log_missing_data("sliverauth.GetSlivers", 'slivers')
40 for sliver in data['slivers']:
41 path = '/vservers/%s' % sliver['name']
42 if not os.path.exists(path):
43 # ignore all non-plc-instantiated slivers
44 instantiation = sliver.get('instantiation','')
45 if instantiation == 'plc-instantiated':
46 logger.log("sliverauth: plc-instantiated slice %s does not yet exist. IGNORING!" % sliver['name'])
49 for chunk in sliver['attributes']:
50 if chunk['tagname']=='enable_hmac':
51 manage_hmac (plc, sliver)
52 elif chunk['tagname']=='omf_control':
53 manage_sshkey (plc, sliver)
56 def SetSliverTag(plc, slice, tagname, value):
57 node_id = tools.node_id()
58 slivertags=plc.GetSliceTags({"name":slice,"node_id":node_id,"tagname":tagname})
59 if len(slivertags)==0:
60 # looks like GetSlivers reports about delegated/nm-controller slices that do *not* belong to this node
61 # and this is something that AddSliceTag does not like
63 slivertag_id=plc.AddSliceTag(slice,tagname,value,node_id)
65 logger.log_exc ("sliverauth.SetSliverTag (probably delegated) slice=%(slice)s tag=%(tagname)s node_id=%(node_id)d"%locals())
68 slivertag_id=slivertags[0]['slice_tag_id']
69 plc.UpdateSliceTag(slivertag_id,value)
71 def find_tag (sliver, tagname):
72 for attribute in sliver['attributes']:
73 # for legacy, try the old-fashioned 'name' as well
74 name = attribute.get('tagname',attribute.get('name',''))
76 return attribute['value']
79 def manage_hmac (plc, sliver):
80 hmac = find_tag (sliver, 'hmac')
83 # let python do its thing
85 d = [random.choice(string.letters) for x in xrange(32)]
87 SetSliverTag(plc,sliver['name'],'hmac',hmac)
88 logger.log("sliverauth: %s: setting hmac" % sliver['name'])
90 path = '/vservers/%s/etc/planetlab' % sliver['name']
91 if os.path.exists(path):
92 keyfile = '%s/key' % path
93 if (tools.replace_file_with_string(keyfile,hmac,chmod=0400)):
94 logger.log ("sliverauth: (over)wrote hmac into %s " % keyfile)
96 # create the key if needed and returns the key contents
97 def generate_sshkey (sliver):
98 # initial version was storing stuff in the sliver directly
99 # keyfile="/vservers/%s/home/%s/.ssh/id_rsa"%(sliver['name'],sliver['name'])
100 # we're now storing this in the same place as the authorized_keys, which in turn
101 # gets mounted to the user's home directory in the sliver
102 keyfile="/home/%s/.ssh/id_rsa"%(sliver['name'])
103 pubfile="%s.pub"%keyfile
104 dotssh=os.path.dirname(keyfile)
105 # create dir if needed
106 if not os.path.isdir (dotssh):
107 os.mkdir (dotssh, 0700)
108 logger.log_call ( [ 'chown', "%s:slices"%(sliver['name']), dotssh ] )
109 if not os.path.isfile (pubfile):
110 comment="%s@%s"%(sliver['name'],socket.gethostname())
111 logger.log_call( [ 'ssh-keygen', '-t', 'rsa', '-N', '', '-f', keyfile , '-C', comment] )
112 os.chmod (keyfile, 0400)
113 logger.log_call ( [ 'chown', "%s:slices"%(sliver['name']), keyfile, pubfile ] )
114 return file(pubfile).read().strip()
116 # a sliver can get created, deleted and re-created
117 # the slice having the tag is not sufficient to skip key geneneration
118 def manage_sshkey (plc, sliver):
119 # regardless of whether the tag is there or not, we need to grab the file
120 # if it's lost b/c e.g. the sliver was destroyed we cannot save the tags content
121 ssh_key = generate_sshkey(sliver)
122 old_tag = find_tag (sliver, 'ssh_key')
123 if ssh_key <> old_tag:
124 SetSliverTag(plc, sliver['name'], 'ssh_key', ssh_key)
125 logger.log ("sliverauth: %s: setting ssh_key" % sliver['name'])