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

  1  # -*- coding: utf-8 -*- 
  2   
  3  # Copyright (C) 2010-2012 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 platform 
 27  from utils import compare_versions 
 28   
 29  PARAMIKO_VERSION = paramiko.__version__.split()[0] 
 30  PARAMIKO_FEATURE = { 
 31      'forward-ssh-agent': compare_versions(PARAMIKO_VERSION, ">=", '1.8.0') and (platform.system() != "Windows"), 
 32      'use-compression': compare_versions(PARAMIKO_VERSION, ">=", '1.7.7.1'), 
 33      'hash-host-entries': compare_versions(PARAMIKO_VERSION, ">=", '99'), 
 34      'host-entries-reloadable': compare_versions(PARAMIKO_VERSION, ">=", '99'), 
 35      'preserve-known-hosts': compare_versions(PARAMIKO_VERSION, ">=", '99'), 
 36  } 
 37   
38 -def _SSHClient_save_host_keys(self, filename):
39 """\ 40 FIXME!!! --- this method should become part of Paramiko 41 42 This method has been taken from SSHClient class in Paramiko and 43 has been improved and adapted to latest SSH implementations. 44 45 Save the host keys back to a file. 46 Only the host keys loaded with 47 L{load_host_keys} (plus any added directly) will be saved -- not any 48 host keys loaded with L{load_system_host_keys}. 49 50 @param filename: the filename to save to 51 @type filename: str 52 53 @raise IOError: if the file could not be written 54 55 """ 56 # update local host keys from file (in case other SSH clients 57 # have written to the known_hosts file meanwhile. 58 if self.known_hosts is not None: 59 self.load_host_keys(self.known_hosts) 60 61 f = open(filename, 'w') 62 #f.write('# SSH host keys collected by paramiko\n') 63 _host_keys = self.get_host_keys() 64 for hostname, keys in _host_keys.iteritems(): 65 66 for keytype, key in keys.iteritems(): 67 f.write('%s %s %s\n' % (hostname, keytype, key.get_base64())) 68 69 f.close()
70 71
72 -def _HostKeys_load(self, filename):
73 """\ 74 Read a file of known SSH host keys, in the format used by openssh. 75 This type of file unfortunately doesn't exist on Windows, but on 76 posix, it will usually be stored in 77 C{os.path.expanduser("~/.ssh/known_hosts")}. 78 79 If this method is called multiple times, the host keys are merged, 80 not cleared. So multiple calls to C{load} will just call L{add}, 81 replacing any existing entries and adding new ones. 82 83 @param filename: name of the file to read host keys from 84 @type filename: str 85 86 @raise IOError: if there was an error reading the file 87 88 """ 89 f = open(filename, 'r') 90 for line in f: 91 line = line.strip() 92 if (len(line) == 0) or (line[0] == '#'): 93 continue 94 e = paramiko.hostkeys.HostKeyEntry.from_line(line) 95 if e is not None: 96 _hostnames = e.hostnames 97 for h in _hostnames: 98 if self.check(h, e.key): 99 e.hostnames.remove(h) 100 if len(e.hostnames): 101 self._entries.append(e) 102 f.close()
103 104
105 -def _HostKeys_add(self, hostname, keytype, key, hash_hostname=True):
106 """\ 107 Add a host key entry to the table. Any existing entry for a 108 C{(hostname, keytype)} pair will be replaced. 109 110 @param hostname: the hostname (or IP) to add 111 @type hostname: str 112 @param keytype: key type (C{"ssh-rsa"} or C{"ssh-dss"}) 113 @type keytype: str 114 @param key: the key to add 115 @type key: L{PKey} 116 117 """ 118 for e in self._entries: 119 if (hostname in e.hostnames) and (e.key.get_name() == keytype): 120 e.key = key 121 return 122 if not hostname.startswith('|1|') and hash_hostname: 123 hostname = self.hash_host(hostname) 124 self._entries.append(paramiko.hostkeys.HostKeyEntry([hostname], key))
125 126
127 -def monkey_patch_paramiko():
128 if not PARAMIKO_FEATURE['preserve-known-hosts']: 129 paramiko.SSHClient.save_host_keys = _SSHClient_save_host_keys 130 if not PARAMIKO_FEATURE['host-entries-reloadable']: 131 paramiko.hostkeys.HostKeys.load = _HostKeys_load 132 if not PARAMIKO_FEATURE['hash-host-entries']: 133 paramiko.hostkeys.HostKeys.add = _HostKeys_add
134