#!/usr/bin/python -tt
# vim:set ts=4 sw=4 expandtab:
#
-# $Id$
-# $URL$
-#
# NodeManager plugin for creating credentials in slivers
# (*) empower slivers to make API calls throught hmac
# (*) also create a ssh key - used by the OMF resource controller
# for authenticating itself with its Experiment Controller
-# xxx todo : a config option for turning these 2 things on or off ?
+# in order to avoid spamming the DB with huge amounts of such tags,
+# (*) slices need to have the 'enable_hmac' tag set
+# (*) or the 'omf_control' tag set, respectively
"""
Sliver authentication support for NodeManager.
"""
-import errno
import os
import random
import string
import tempfile
-import time
+import socket
import logger
import tools
-def start(options, conf):
+def start():
logger.log("sliverauth: (dummy) plugin starting up...")
def GetSlivers(data, config, plc):
logger.log("sliverauth: plc-instantiated slice %s does not yet exist. IGNORING!" % sliver['name'])
continue
- manage_hmac (plc, sliver)
- manage_sshkey (plc, sliver)
+ system_slice = False
+ for chunk in sliver['attributes']:
+ if chunk['tagname'] == "system":
+ if chunk['value'] in (True, 1, '1') or chunk['value'].lower() == "true":
+ system_slice = True
+
+ for chunk in sliver['attributes']:
+ if chunk['tagname']=='enable_hmac' and not system_slice:
+ manage_hmac (plc, sliver)
+
+ if chunk['tagname']=='omf_control':
+ manage_sshkey (plc, sliver)
def SetSliverTag(plc, slice, tagname, value):
if (tools.replace_file_with_string(keyfile,hmac,chmod=0400)):
logger.log ("sliverauth: (over)wrote hmac into %s " % keyfile)
+# create the key if needed and returns the key contents
+def generate_sshkey (sliver):
+# initial version was storing stuff in the sliver directly
+# keyfile="/vservers/%s/home/%s/.ssh/id_rsa"%(sliver['name'],sliver['name'])
+# we're now storing this in the same place as the authorized_keys, which in turn
+# gets mounted to the user's home directory in the sliver
+ keyfile="/home/%s/.ssh/id_rsa"%(sliver['name'])
+ pubfile="%s.pub"%keyfile
+ dotssh=os.path.dirname(keyfile)
+ # create dir if needed
+ if not os.path.isdir (dotssh):
+ os.mkdir (dotssh, 0700)
+ logger.log_call ( [ 'chown', "%s:slices"%(sliver['name']), dotssh ] )
+ if not os.path.isfile (pubfile):
+ comment="%s@%s"%(sliver['name'],socket.gethostname())
+ logger.log_call( [ 'ssh-keygen', '-t', 'rsa', '-N', '', '-f', keyfile , '-C', comment] )
+ os.chmod (keyfile, 0400)
+ logger.log_call ( [ 'chown', "%s:slices"%(sliver['name']), keyfile, pubfile ] )
+ return file(pubfile).read().strip()
+
+# a sliver can get created, deleted and re-created
+# the slice having the tag is not sufficient to skip key geneneration
def manage_sshkey (plc, sliver):
- ssh_key = find_tag (sliver, 'ssh_key')
-
- # generate if not present
- if not ssh_key:
- # create dir if needed
- dotssh="/vservers/%s/home/%s/.ssh"%(sliver['name'],sliver['name'])
- if not os.path.isdir (dotssh):
- os.mkdir (dotssh, 0700)
- logger.log_call ( [ 'chown', "%s:slices"%(sliver['name']), dotssh ] )
- keyfile="%s/id_rsa"%dotssh
- pubfile="%s.pub"%keyfile
- if not os.path.isfile (pubfile):
- logger.log_call( [ 'ssh-keygen', '-t', 'rsa', '-N', '', '-f', keyfile ] )
- os.chmod (keyfile, 0400)
- logger.log_call ( [ 'chown', "%s:slices"%(sliver['name']), keyfile, pubfile ] )
- ssh_key = file(pubfile).read()
+ # regardless of whether the tag is there or not, we need to grab the file
+ # if it's lost b/c e.g. the sliver was destroyed we cannot save the tags content
+ ssh_key = generate_sshkey(sliver)
+ old_tag = find_tag (sliver, 'ssh_key')
+ if ssh_key <> old_tag:
SetSliverTag(plc, sliver['name'], 'ssh_key', ssh_key)
logger.log ("sliverauth: %s: setting ssh_key" % sliver['name'])