/usr/lib/python2.7/dist-packages/paramiko/config.py is in python-paramiko 2.0.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 | # Copyright (C) 2006-2007 Robey Pointer <robeypointer@gmail.com>
# Copyright (C) 2012 Olle Lundberg <geek@nerd.sh>
#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
"""
Configuration file (aka ``ssh_config``) support.
"""
import fnmatch
import os
import re
import shlex
import socket
SSH_PORT = 22
class SSHConfig (object):
"""
Representation of config information as stored in the format used by
OpenSSH. Queries can be made via `lookup`. The format is described in
OpenSSH's ``ssh_config`` man page. This class is provided primarily as a
convenience to posix users (since the OpenSSH format is a de-facto
standard on posix) but should work fine on Windows too.
.. versionadded:: 1.6
"""
SETTINGS_REGEX = re.compile(r'(\w+)(?:\s*=\s*|\s+)(.+)')
def __init__(self):
"""
Create a new OpenSSH config object.
"""
self._config = []
def parse(self, file_obj):
"""
Read an OpenSSH config from the given file object.
:param file_obj: a file-like object to read the config file from
"""
host = {"host": ['*'], "config": {}}
for line in file_obj:
# Strip any leading or trailing whitespace from the line.
# See https://github.com/paramiko/paramiko/issues/499 for more info.
line = line.strip()
if not line or line.startswith('#'):
continue
match = re.match(self.SETTINGS_REGEX, line)
if not match:
raise Exception("Unparsable line %s" % line)
key = match.group(1).lower()
value = match.group(2)
if key == 'host':
self._config.append(host)
host = {
'host': self._get_hosts(value),
'config': {}
}
elif key == 'proxycommand' and value.lower() == 'none':
# Store 'none' as None; prior to 3.x, it will get stripped out
# at the end (for compatibility with issue #415). After 3.x, it
# will simply not get stripped, leaving a nice explicit marker.
host['config'][key] = None
else:
if value.startswith('"') and value.endswith('"'):
value = value[1:-1]
# identityfile, localforward, remoteforward keys are special
# cases, since they are allowed to be specified multiple times
# and they should be tried in order of specification.
if key in ['identityfile', 'localforward', 'remoteforward']:
if key in host['config']:
host['config'][key].append(value)
else:
host['config'][key] = [value]
elif key not in host['config']:
host['config'][key] = value
self._config.append(host)
def lookup(self, hostname):
"""
Return a dict of config options for a given hostname.
The host-matching rules of OpenSSH's ``ssh_config`` man page are used:
For each parameter, the first obtained value will be used. The
configuration files contain sections separated by ``Host``
specifications, and that section is only applied for hosts that match
one of the patterns given in the specification.
Since the first obtained value for each parameter is used, more host-
specific declarations should be given near the beginning of the file,
and general defaults at the end.
The keys in the returned dict are all normalized to lowercase (look for
``"port"``, not ``"Port"``. The values are processed according to the
rules for substitution variable expansion in ``ssh_config``.
:param str hostname: the hostname to lookup
"""
matches = [
config for config in self._config
if self._allowed(config['host'], hostname)
]
ret = {}
for match in matches:
for key, value in match['config'].items():
if key not in ret:
# Create a copy of the original value,
# else it will reference the original list
# in self._config and update that value too
# when the extend() is being called.
ret[key] = value[:] if value is not None else value
elif key == 'identityfile':
ret[key].extend(value)
ret = self._expand_variables(ret, hostname)
# TODO: remove in 3.x re #670
if 'proxycommand' in ret and ret['proxycommand'] is None:
del ret['proxycommand']
return ret
def get_hostnames(self):
"""
Return the set of literal hostnames defined in the SSH config (both
explicit hostnames and wildcard entries).
"""
hosts = set()
for entry in self._config:
hosts.update(entry['host'])
return hosts
def _allowed(self, hosts, hostname):
match = False
for host in hosts:
if host.startswith('!') and fnmatch.fnmatch(hostname, host[1:]):
return False
elif fnmatch.fnmatch(hostname, host):
match = True
return match
def _expand_variables(self, config, hostname):
"""
Return a dict of config options with expanded substitutions
for a given hostname.
Please refer to man ``ssh_config`` for the parameters that
are replaced.
:param dict config: the config for the hostname
:param str hostname: the hostname that the config belongs to
"""
if 'hostname' in config:
config['hostname'] = config['hostname'].replace('%h', hostname)
else:
config['hostname'] = hostname
if 'port' in config:
port = config['port']
else:
port = SSH_PORT
user = os.getenv('USER')
if 'user' in config:
remoteuser = config['user']
else:
remoteuser = user
host = socket.gethostname().split('.')[0]
fqdn = LazyFqdn(config, host)
homedir = os.path.expanduser('~')
replacements = {'controlpath':
[
('%h', config['hostname']),
('%l', fqdn),
('%L', host),
('%n', hostname),
('%p', port),
('%r', remoteuser),
('%u', user)
],
'identityfile':
[
('~', homedir),
('%d', homedir),
('%h', config['hostname']),
('%l', fqdn),
('%u', user),
('%r', remoteuser)
],
'proxycommand':
[
('%h', config['hostname']),
('%p', port),
('%r', remoteuser)
]
}
for k in config:
if config[k] is None:
continue
if k in replacements:
for find, replace in replacements[k]:
if isinstance(config[k], list):
for item in range(len(config[k])):
if find in config[k][item]:
config[k][item] = config[k][item].\
replace(find, str(replace))
else:
if find in config[k]:
config[k] = config[k].replace(find, str(replace))
return config
def _get_hosts(self, host):
"""
Return a list of host_names from host value.
"""
try:
return shlex.split(host)
except ValueError:
raise Exception("Unparsable host %s" % host)
class LazyFqdn(object):
"""
Returns the host's fqdn on request as string.
"""
def __init__(self, config, host=None):
self.fqdn = None
self.config = config
self.host = host
def __str__(self):
if self.fqdn is None:
#
# If the SSH config contains AddressFamily, use that when
# determining the local host's FQDN. Using socket.getfqdn() from
# the standard library is the most general solution, but can
# result in noticeable delays on some platforms when IPv6 is
# misconfigured or not available, as it calls getaddrinfo with no
# address family specified, so both IPv4 and IPv6 are checked.
#
# Handle specific option
fqdn = None
address_family = self.config.get('addressfamily', 'any').lower()
if address_family != 'any':
try:
family = socket.AF_INET if address_family == 'inet' \
else socket.AF_INET6
results = socket.getaddrinfo(
self.host,
None,
family,
socket.SOCK_DGRAM,
socket.IPPROTO_IP,
socket.AI_CANONNAME
)
for res in results:
af, socktype, proto, canonname, sa = res
if canonname and '.' in canonname:
fqdn = canonname
break
# giaerror -> socket.getaddrinfo() can't resolve self.host
# (which is from socket.gethostname()). Fall back to the
# getfqdn() call below.
except socket.gaierror:
pass
# Handle 'any' / unspecified
if fqdn is None:
fqdn = socket.getfqdn()
# Cache
self.fqdn = fqdn
return self.fqdn
|