getsshkeys.py

   1 #!/usr/bin/python
   2
   3 import os
   4 import sys
   5 import string
   6 import time
   7 import plc
   8
   9 args = {}
  10 args['known_hosts'] =  os.environ['HOME'] + "/.ssh/known_hosts"
  11
  12 class SSHKnownHosts:
  13         def __init__(self, args = args):
  14                 self.args = args
  15                 self.read_knownhosts()
  16
  17         def _split_kh_entry(self, line):
  18                 s = line.split(' ')
  19                 try:
  20                         (host,ip) = s[0].split(',')
  21                 except:
  22                         ip = s[0]
  23                         host = ""
  24
  25                 key = ' '.join(s[1:3])
  26                 comment = ' '.join(s[3:])
  27                 return (host, ip, key, comment)
  28
  29         def _get_index(self, host, ip):
  30                 index = ""
  31                 if host is not "":
  32                         index = "%s,%s" % (host,ip)
  33                 else:
  34                         index = ip
  35                 return index
  36
  37         def read_knownhosts(self):
  38                 kh_read = open(self.args["known_hosts"], 'r')
  39                 self.pl_keys = {}
  40                 self.other_keys = {}
  41                 for line in kh_read:
  42                         (host, ip, key, comment) = self._split_kh_entry(line[:-1])
  43                         rec = { self._get_index(host, ip) : "%s %s" % (key, comment) }
  44                         if 'PlanetLab' in comment:
  45                                 self.pl_keys.update(rec)
  46                         else:
  47                                 self.other_keys.update(rec)
  48
  49                 #for i in self.pl_keys:
  50                 #       print i
  51                 #       print self.pl_keys[i]
  52
  53                 return
  54
  55         def write(self):
  56                 self.write_knownhosts()
  57
  58         def write_knownhosts(self):
  59                 f = open(self.args['known_hosts'], 'w')
  60                 for index in self.pl_keys:
  61                         print >>f, "%s %s" % (index, self.pl_keys[index])
  62                 for index in self.other_keys:
  63                         print >>f, "%s %s" % (index, self.other_keys[index])
  64                 f.close()
  65
  66         def updateAll(self):
  67                 l_nodes = plc.getNodes()
  68                 d_nodes = {}
  69                 nokey_list = []
  70                 for node in l_nodes:
  71                         name = node['hostname']
  72                         d_nodes[name] = node
  73
  74                 for host in d_nodes:
  75                         node = d_nodes[host]
  76                         (host, ip, key, comment) = self._record_from_node(node, nokey_list)
  77                         rec = { "%s,%s" % (host,ip) : "%s %s" % (key, comment) }
  78                         self.pl_keys.update(rec)
  79
  80                 return nokey_list
  81
  82         def delete(self, host):
  83                 node = plc.getNodes(host)
  84                 (host, ip, _, _) = self._record_from_node(node[0])
  85                 index = "%s,%s" % (host,ip)
  86                 if index in self.pl_keys:
  87                         del self.pl_keys[index]
  88                 if index in self.other_keys:
  89                         del self.other_keys[index]
  90
  91         def updateDirect(self, host):
  92                 cmd = os.popen("/usr/bin/ssh-keyscan -t rsa %s 2>/dev/null" % host)
  93                 line = cmd.read()
  94                 (h,  ip,  key,  comment) = self._split_kh_entry(line[:-1])
  95                 node = plc.getNodes(host)
  96                 (host2, ip2, x, x) = self._record_from_node(node[0])
  97                 rec = { self._get_index(host2, ip2) : "%s %s" % (key, "DIRECT") }
  98
  99                 self.delete(host)
 100                 self.other_keys.update(rec)
 101
 102         def update(self, host):
 103                 node = plc.getNodes(host)
 104                 ret = self._record_from_node(node[0])
 105                 (host, ip, key, comment)  = ret
 106                 if ip == None:
 107                         self.updateDirect(host)
 108                 else:
 109                         rec = { "%s,%s" % (host,ip) : "%s %s" % (key, comment) }
 110                         self.pl_keys.update(rec)
 111
 112         def _record_from_node(self, node, nokey_list=None):
 113                 host = node['hostname']
 114                 key = node['ssh_rsa_key']
 115
 116                 l_nw = plc.getNodeNetworks({'nodenetwork_id':node['nodenetwork_ids']})
 117                 if len(l_nw) == 0:
 118                         # No network for this node. So, skip it.
 119                         return (host, None, None, None)
 120
 121                 ip = l_nw[0]['ip']
 122
 123                 if key == None:
 124                         if nokey_list is not None: nokey_list += [node]
 125                         return (host, ip, None, None)
 126
 127                 key = key.strip()
 128                 # TODO: check for '==' at end of key.
 129                 if key[-1] != '=':
 130                         print "Host with corrupt key! for %s %s" % (node['boot_state'], node['hostname'])
 131
 132                 s_date = time.strftime("%Y/%m/%d_%H:%M:%S",time.gmtime(time.time()))
 133                 #rec = { "%s,%s" % (host,ip) : "%s %s" % (key, "PlanetLab_%s" % (s_date)) }
 134                 #return rec
 135                 return (host, ip, key, "PlanetLab_%s" % s_date)
 136
 137
 138 def main():
 139         k = SSHKnownHosts()
 140         nokey_list = k.updateAll()
 141
 142         for node in nokey_list:
 143                 print "%5s %s" % (node['boot_state'], node['hostname'])
 144
 145 if __name__ == '__main__':
 146         #main()
 147         k = SSHKnownHosts()
 148         #print "update"
 149         #k.update('planetlab-4.cs.princeton.edu')
 150         #print "updateDirect"
 151         k.update(sys.argv[1])
 152         #k.updateDirect(sys.argv[1])
 153         k.write()