plugins/sliverauth.py

   1 #!/usr/bin/python -tt
   2 # vim:set ts=4 sw=4 expandtab:
   3 # NodeManager plugin to empower slivers to make API calls
   4
   5 """
   6 Sliver authentication support for NodeManager.
   7
   8 """
   9
  10 import errno
  11 import os
  12 import random
  13 import string
  14 import tempfile
  15
  16 import logger
  17 import tools
  18
  19 def start(options, conf):
  20     logger.log("sliverauth plugin starting up...")
  21
  22 def SetSliverTag(plc, slice, tagname, value):
  23     node_id = tools.node_id()
  24     slivertags=plc.GetSliceTags({"name":slice,"node_id":node_id})
  25     if len(slivertags)==0:
  26         slivertag_id=plc.AddSliceTag(slice,tagname,value,node_id)
  27     else:
  28         slivertag_id=slivertags[0]['slice_tag_id']
  29         plc.UpdateSliceTag(slivertag_id,value)
  30
  31 def GetSlivers(plc, data, conf):
  32     if 'slivers' not in data:
  33         logger.log("sliverauth: getslivers data lack's sliver information. IGNORING!")
  34         return
  35
  36     random.seed(42)
  37     for sliver in data['slivers']:
  38         found_hmac = False
  39         for attribute in sliver['attributes']:
  40             name = attribute.get('tagname',attribute.get('name',''))
  41             if name == 'hmac':
  42                 found_hmac = True
  43                 hmac = attribute['value']
  44                 break
  45
  46         if not found_hmac:
  47             d = [random.choice(string.letters) for x in xrange(32)]
  48             hmac = "".join(d)
  49             SetSliverTag(plc,sliver['name'],'hmac',hmac)
  50
  51         path = '/vservers/%s/etc/planetlab' % sliver['name']
  52         if os.path.exists(path):
  53             keyfile = '%s/key' % path
  54             oldhmac = ''
  55             if os.path.exists(keyfile):
  56                 f = open(keyfile,'r')
  57                 oldhmac = f.read()
  58                 f.close()
  59
  60             if oldhmac <> hmac:
  61                 # create a temporary file in the vserver
  62                 fd, name = tempfile.mkstemp('','key',path)
  63                 os.write(fd,hmac)
  64                 os.close(fd)
  65                 if os.path.exists(keyfile):
  66                     os.unlink(keyfile)
  67                 os.rename(name,keyfile)
  68
  69             os.chmod(keyfile,0400)
  70