Package x2go :: Module _paramiko
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Source Code for Module x2go._paramiko

  1  # -*- coding: utf-8 -*- 
  2   
  3  # Copyright (C) 2010-2014 by Mike Gabriel <mike.gabriel@das-netzwerkteam.de> 
  4  # 
  5  # Python X2Go is free software; you can redistribute it and/or modify 
  6  # it under the terms of the GNU Affero General Public License as published by 
  7  # the Free Software Foundation; either version 3 of the License, or 
  8  # (at your option) any later version. 
  9  # 
 10  # Python X2Go is distributed in the hope that it will be useful, 
 11  # but WITHOUT ANY WARRANTY; without even the implied warranty of 
 12  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 13  # GNU Affero General Public License for more details. 
 14  # 
 15  # You should have received a copy of the GNU Affero General Public License 
 16  # along with this program; if not, write to the 
 17  # Free Software Foundation, Inc., 
 18  # 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 
 19   
 20  """\ 
 21  Monkey Patch and feature map for Python Paramiko 
 22   
 23  """ 
 24   
 25  import paramiko 
 26  import re 
 27  try: 
 28      from paramiko.config import SSH_PORT 
 29  except ImportError: 
 30      SSH_PORT=22 
 31  import platform 
 32  from utils import compare_versions 
 33   
 34  PARAMIKO_VERSION = paramiko.__version__.split()[0] 
 35  PARAMIKO_FEATURE = { 
 36      'forward-ssh-agent': compare_versions(PARAMIKO_VERSION, ">=", '1.8.0') and (platform.system() != "Windows"), 
 37      'use-compression': compare_versions(PARAMIKO_VERSION, ">=", '1.7.7.1'), 
 38      'hash-host-entries': compare_versions(PARAMIKO_VERSION, ">=", '99'), 
 39      'host-entries-reloadable': compare_versions(PARAMIKO_VERSION, ">=", '1.11.0'), 
 40      'preserve-known-hosts': compare_versions(PARAMIKO_VERSION, ">=", '1.11.0'), 
 41  } 
 42   
43 -def _SSHClient_save_host_keys(self, filename):
44 """\ 45 Available since paramiko 1.11.0... 46 47 This method has been taken from SSHClient class in Paramiko and 48 has been improved and adapted to latest SSH implementations. 49 50 Save the host keys back to a file. 51 Only the host keys loaded with 52 L{load_host_keys} (plus any added directly) will be saved -- not any 53 host keys loaded with L{load_system_host_keys}. 54 55 @param filename: the filename to save to 56 @type filename: str 57 58 @raise IOError: if the file could not be written 59 60 """ 61 # update local host keys from file (in case other SSH clients 62 # have written to the known_hosts file meanwhile. 63 if self.known_hosts is not None: 64 self.load_host_keys(self.known_hosts) 65 66 f = open(filename, 'w') 67 #f.write('# SSH host keys collected by paramiko\n') 68 _host_keys = self.get_host_keys() 69 for hostname, keys in _host_keys.iteritems(): 70 71 for keytype, key in keys.iteritems(): 72 f.write('%s %s %s\n' % (hostname, keytype, key.get_base64())) 73 74 f.close()
75 76
77 -def _HostKeys_load(self, filename):
78 """\ 79 Available since paramiko 1.11.0... 80 81 Read a file of known SSH host keys, in the format used by openssh. 82 This type of file unfortunately doesn't exist on Windows, but on 83 posix, it will usually be stored in 84 C{os.path.expanduser("~/.ssh/known_hosts")}. 85 86 If this method is called multiple times, the host keys are merged, 87 not cleared. So multiple calls to C{load} will just call L{add}, 88 replacing any existing entries and adding new ones. 89 90 @param filename: name of the file to read host keys from 91 @type filename: str 92 93 @raise IOError: if there was an error reading the file 94 95 """ 96 f = open(filename, 'r') 97 for line in f: 98 line = line.strip() 99 if (len(line) == 0) or (line[0] == '#'): 100 continue 101 e = paramiko.hostkeys.HostKeyEntry.from_line(line) 102 if e is not None: 103 _hostnames = e.hostnames 104 for h in _hostnames: 105 if self.check(h, e.key): 106 e.hostnames.remove(h) 107 if len(e.hostnames): 108 self._entries.append(e) 109 f.close()
110 111
112 -def _HostKeys_add(self, hostname, keytype, key, hash_hostname=True):
113 """\ 114 Add a host key entry to the table. Any existing entry for a 115 C{(hostname, keytype)} pair will be replaced. 116 117 @param hostname: the hostname (or IP) to add 118 @type hostname: str 119 @param keytype: key type (C{"ssh-rsa"} or C{"ssh-dss"}) 120 @type keytype: str 121 @param key: the key to add 122 @type key: L{PKey} 123 124 """ 125 # IPv4 and IPv6 addresses using the SSH default port need to be stripped off the port number 126 if re.match('^\[.*\]\:'+str(SSH_PORT)+'$', hostname): 127 # so stripping off the port and the square brackets here... 128 hostname = hostname.split(':')[-2].lstrip('[').rstrip(']') 129 130 for e in self._entries: 131 if (hostname in e.hostnames) and (e.key.get_name() == keytype): 132 e.key = key 133 return 134 if not hostname.startswith('|1|') and hash_hostname: 135 hostname = self.hash_host(hostname) 136 self._entries.append(paramiko.hostkeys.HostKeyEntry([hostname], key))
137 138
139 -def monkey_patch_paramiko():
140 if not PARAMIKO_FEATURE['preserve-known-hosts']: 141 paramiko.SSHClient.save_host_keys = _SSHClient_save_host_keys 142 if not PARAMIKO_FEATURE['host-entries-reloadable']: 143 paramiko.hostkeys.HostKeys.load = _HostKeys_load 144 if not PARAMIKO_FEATURE['hash-host-entries']: 145 paramiko.hostkeys.HostKeys.add = _HostKeys_add
146