Package x2go :: Module _paramiko
[frames] | no frames]

Source Code for Module x2go._paramiko

  1  # -*- coding: utf-8 -*- 
  2   
  3  # Copyright (C) 2010-2013 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  from paramiko.config import SSH_PORT 
 28  import platform 
 29  from utils import compare_versions 
 30   
 31  PARAMIKO_VERSION = paramiko.__version__.split()[0] 
 32  PARAMIKO_FEATURE = { 
 33      'forward-ssh-agent': compare_versions(PARAMIKO_VERSION, ">=", '1.8.0') and (platform.system() != "Windows"), 
 34      'use-compression': compare_versions(PARAMIKO_VERSION, ">=", '1.7.7.1'), 
 35      'hash-host-entries': compare_versions(PARAMIKO_VERSION, ">=", '99'), 
 36      'host-entries-reloadable': compare_versions(PARAMIKO_VERSION, ">=", '1.11.0'), 
 37      'preserve-known-hosts': compare_versions(PARAMIKO_VERSION, ">=", '1.11.0'), 
 38  } 
 39   
40 -def _SSHClient_save_host_keys(self, filename):
41 """\ 42 Available since paramiko 1.11.0... 43 44 This method has been taken from SSHClient class in Paramiko and 45 has been improved and adapted to latest SSH implementations. 46 47 Save the host keys back to a file. 48 Only the host keys loaded with 49 L{load_host_keys} (plus any added directly) will be saved -- not any 50 host keys loaded with L{load_system_host_keys}. 51 52 @param filename: the filename to save to 53 @type filename: str 54 55 @raise IOError: if the file could not be written 56 57 """ 58 # update local host keys from file (in case other SSH clients 59 # have written to the known_hosts file meanwhile. 60 if self.known_hosts is not None: 61 self.load_host_keys(self.known_hosts) 62 63 f = open(filename, 'w') 64 #f.write('# SSH host keys collected by paramiko\n') 65 _host_keys = self.get_host_keys() 66 for hostname, keys in _host_keys.iteritems(): 67 68 for keytype, key in keys.iteritems(): 69 f.write('%s %s %s\n' % (hostname, keytype, key.get_base64())) 70 71 f.close()
72 73
74 -def _HostKeys_load(self, filename):
75 """\ 76 Available since paramiko 1.11.0... 77 78 Read a file of known SSH host keys, in the format used by openssh. 79 This type of file unfortunately doesn't exist on Windows, but on 80 posix, it will usually be stored in 81 C{os.path.expanduser("~/.ssh/known_hosts")}. 82 83 If this method is called multiple times, the host keys are merged, 84 not cleared. So multiple calls to C{load} will just call L{add}, 85 replacing any existing entries and adding new ones. 86 87 @param filename: name of the file to read host keys from 88 @type filename: str 89 90 @raise IOError: if there was an error reading the file 91 92 """ 93 f = open(filename, 'r') 94 for line in f: 95 line = line.strip() 96 if (len(line) == 0) or (line[0] == '#'): 97 continue 98 e = paramiko.hostkeys.HostKeyEntry.from_line(line) 99 if e is not None: 100 _hostnames = e.hostnames 101 for h in _hostnames: 102 if self.check(h, e.key): 103 e.hostnames.remove(h) 104 if len(e.hostnames): 105 self._entries.append(e) 106 f.close()
107 108
109 -def _HostKeys_add(self, hostname, keytype, key, hash_hostname=True):
110 """\ 111 Add a host key entry to the table. Any existing entry for a 112 C{(hostname, keytype)} pair will be replaced. 113 114 @param hostname: the hostname (or IP) to add 115 @type hostname: str 116 @param keytype: key type (C{"ssh-rsa"} or C{"ssh-dss"}) 117 @type keytype: str 118 @param key: the key to add 119 @type key: L{PKey} 120 121 """ 122 # IPv4 and IPv6 addresses using the SSH default port need to be stripped off the port number 123 if re.match('^\[.*\]\:'+str(SSH_PORT)+'$', hostname): 124 # so stripping off the port and the square brackets here... 125 hostname = hostname.split(':')[-2].lstrip('[').rstrip(']') 126 127 for e in self._entries: 128 if (hostname in e.hostnames) and (e.key.get_name() == keytype): 129 e.key = key 130 return 131 if not hostname.startswith('|1|') and hash_hostname: 132 hostname = self.hash_host(hostname) 133 self._entries.append(paramiko.hostkeys.HostKeyEntry([hostname], key))
134 135
136 -def monkey_patch_paramiko():
137 if not PARAMIKO_FEATURE['preserve-known-hosts']: 138 paramiko.SSHClient.save_host_keys = _SSHClient_save_host_keys 139 if not PARAMIKO_FEATURE['host-entries-reloadable']: 140 paramiko.hostkeys.HostKeys.load = _HostKeys_load 141 if not PARAMIKO_FEATURE['hash-host-entries']: 142 paramiko.hostkeys.HostKeys.add = _HostKeys_add
143