/usr/share/pyshared/paramiko/hostkeys.py is in python-paramiko 1.7.7.1-2.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 | # Copyright (C) 2006-2007 Robey Pointer <robeypointer@gmail.com>
#
# 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 distrubuted 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.
"""
L{HostKeys}
"""
import base64
from Crypto.Hash import SHA, HMAC
import UserDict
from paramiko.common import *
from paramiko.dsskey import DSSKey
from paramiko.rsakey import RSAKey
class HostKeyEntry:
"""
Representation of a line in an OpenSSH-style "known hosts" file.
"""
def __init__(self, hostnames=None, key=None):
self.valid = (hostnames is not None) and (key is not None)
self.hostnames = hostnames
self.key = key
def from_line(cls, line):
"""
Parses the given line of text to find the names for the host,
the type of key, and the key data. The line is expected to be in the
format used by the openssh known_hosts file.
Lines are expected to not have leading or trailing whitespace.
We don't bother to check for comments or empty lines. All of
that should be taken care of before sending the line to us.
@param line: a line from an OpenSSH known_hosts file
@type line: str
"""
fields = line.split(' ')
if len(fields) < 3:
# Bad number of fields
return None
fields = fields[:3]
names, keytype, key = fields
names = names.split(',')
# Decide what kind of key we're looking at and create an object
# to hold it accordingly.
if keytype == 'ssh-rsa':
key = RSAKey(data=base64.decodestring(key))
elif keytype == 'ssh-dss':
key = DSSKey(data=base64.decodestring(key))
else:
return None
return cls(names, key)
from_line = classmethod(from_line)
def to_line(self):
"""
Returns a string in OpenSSH known_hosts file format, or None if
the object is not in a valid state. A trailing newline is
included.
"""
if self.valid:
return '%s %s %s\n' % (','.join(self.hostnames), self.key.get_name(),
self.key.get_base64())
return None
def __repr__(self):
return '<HostKeyEntry %r: %r>' % (self.hostnames, self.key)
class HostKeys (UserDict.DictMixin):
"""
Representation of an openssh-style "known hosts" file. Host keys can be
read from one or more files, and then individual hosts can be looked up to
verify server keys during SSH negotiation.
A HostKeys object can be treated like a dict; any dict lookup is equivalent
to calling L{lookup}.
@since: 1.5.3
"""
def __init__(self, filename=None):
"""
Create a new HostKeys object, optionally loading keys from an openssh
style host-key file.
@param filename: filename to load host keys from, or C{None}
@type filename: str
"""
# emulate a dict of { hostname: { keytype: PKey } }
self._entries = []
if filename is not None:
self.load(filename)
def add(self, hostname, keytype, key):
"""
Add a host key entry to the table. Any existing entry for a
C{(hostname, keytype)} pair will be replaced.
@param hostname: the hostname (or IP) to add
@type hostname: str
@param keytype: key type (C{"ssh-rsa"} or C{"ssh-dss"})
@type keytype: str
@param key: the key to add
@type key: L{PKey}
"""
for e in self._entries:
if (hostname in e.hostnames) and (e.key.get_name() == keytype):
e.key = key
return
self._entries.append(HostKeyEntry([hostname], key))
def load(self, filename):
"""
Read a file of known SSH host keys, in the format used by openssh.
This type of file unfortunately doesn't exist on Windows, but on
posix, it will usually be stored in
C{os.path.expanduser("~/.ssh/known_hosts")}.
If this method is called multiple times, the host keys are merged,
not cleared. So multiple calls to C{load} will just call L{add},
replacing any existing entries and adding new ones.
@param filename: name of the file to read host keys from
@type filename: str
@raise IOError: if there was an error reading the file
"""
f = open(filename, 'r')
for line in f:
line = line.strip()
if (len(line) == 0) or (line[0] == '#'):
continue
e = HostKeyEntry.from_line(line)
if e is not None:
self._entries.append(e)
f.close()
def save(self, filename):
"""
Save host keys into a file, in the format used by openssh. The order of
keys in the file will be preserved when possible (if these keys were
loaded from a file originally). The single exception is that combined
lines will be split into individual key lines, which is arguably a bug.
@param filename: name of the file to write
@type filename: str
@raise IOError: if there was an error writing the file
@since: 1.6.1
"""
f = open(filename, 'w')
for e in self._entries:
line = e.to_line()
if line:
f.write(line)
f.close()
def lookup(self, hostname):
"""
Find a hostkey entry for a given hostname or IP. If no entry is found,
C{None} is returned. Otherwise a dictionary of keytype to key is
returned. The keytype will be either C{"ssh-rsa"} or C{"ssh-dss"}.
@param hostname: the hostname (or IP) to lookup
@type hostname: str
@return: keys associated with this host (or C{None})
@rtype: dict(str, L{PKey})
"""
class SubDict (UserDict.DictMixin):
def __init__(self, hostname, entries, hostkeys):
self._hostname = hostname
self._entries = entries
self._hostkeys = hostkeys
def __getitem__(self, key):
for e in self._entries:
if e.key.get_name() == key:
return e.key
raise KeyError(key)
def __setitem__(self, key, val):
for e in self._entries:
if e.key is None:
continue
if e.key.get_name() == key:
# replace
e.key = val
break
else:
# add a new one
e = HostKeyEntry([hostname], val)
self._entries.append(e)
self._hostkeys._entries.append(e)
def keys(self):
return [e.key.get_name() for e in self._entries if e.key is not None]
entries = []
for e in self._entries:
for h in e.hostnames:
if (h.startswith('|1|') and (self.hash_host(hostname, h) == h)) or (h == hostname):
entries.append(e)
if len(entries) == 0:
return None
return SubDict(hostname, entries, self)
def check(self, hostname, key):
"""
Return True if the given key is associated with the given hostname
in this dictionary.
@param hostname: hostname (or IP) of the SSH server
@type hostname: str
@param key: the key to check
@type key: L{PKey}
@return: C{True} if the key is associated with the hostname; C{False}
if not
@rtype: bool
"""
k = self.lookup(hostname)
if k is None:
return False
host_key = k.get(key.get_name(), None)
if host_key is None:
return False
return str(host_key) == str(key)
def clear(self):
"""
Remove all host keys from the dictionary.
"""
self._entries = []
def __getitem__(self, key):
ret = self.lookup(key)
if ret is None:
raise KeyError(key)
return ret
def __setitem__(self, hostname, entry):
# don't use this please.
if len(entry) == 0:
self._entries.append(HostKeyEntry([hostname], None))
return
for key_type in entry.keys():
found = False
for e in self._entries:
if (hostname in e.hostnames) and (e.key.get_name() == key_type):
# replace
e.key = entry[key_type]
found = True
if not found:
self._entries.append(HostKeyEntry([hostname], entry[key_type]))
def keys(self):
# python 2.4 sets would be nice here.
ret = []
for e in self._entries:
for h in e.hostnames:
if h not in ret:
ret.append(h)
return ret
def values(self):
ret = []
for k in self.keys():
ret.append(self.lookup(k))
return ret
def hash_host(hostname, salt=None):
"""
Return a "hashed" form of the hostname, as used by openssh when storing
hashed hostnames in the known_hosts file.
@param hostname: the hostname to hash
@type hostname: str
@param salt: optional salt to use when hashing (must be 20 bytes long)
@type salt: str
@return: the hashed hostname
@rtype: str
"""
if salt is None:
salt = rng.read(SHA.digest_size)
else:
if salt.startswith('|1|'):
salt = salt.split('|')[2]
salt = base64.decodestring(salt)
assert len(salt) == SHA.digest_size
hmac = HMAC.HMAC(salt, hostname, SHA).digest()
hostkey = '|1|%s|%s' % (base64.encodestring(salt), base64.encodestring(hmac))
return hostkey.replace('\n', '')
hash_host = staticmethod(hash_host)
|