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
|
# Copyright (C) 2003-2007 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 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.
"""
RSA keys.
"""
from cryptography.exceptions import InvalidSignature
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from paramiko.message import Message
from paramiko.pkey import PKey
from paramiko.py3compat import PY2
from paramiko.ssh_exception import SSHException
class RSAKey(PKey):
"""
Representation of an RSA key which can be used to sign and verify SSH2
data.
"""
def __init__(
self,
msg=None,
data=None,
filename=None,
password=None,
key=None,
file_obj=None,
):
self.key = None
if file_obj is not None:
self._from_private_key(file_obj, password)
return
if filename is not None:
self._from_private_key_file(filename, password)
return
if (msg is None) and (data is not None):
msg = Message(data)
if key is not None:
self.key = key
else:
if msg is None:
raise SSHException("Key object may not be empty")
if msg.get_text() != "ssh-rsa":
raise SSHException("Invalid key")
self.key = rsa.RSAPublicNumbers(
e=msg.get_mpint(), n=msg.get_mpint()
).public_key(default_backend())
@property
def size(self):
return self.key.key_size
@property
def public_numbers(self):
if isinstance(self.key, rsa.RSAPrivateKey):
return self.key.private_numbers().public_numbers
else:
return self.key.public_numbers()
def asbytes(self):
m = Message()
m.add_string("ssh-rsa")
m.add_mpint(self.public_numbers.e)
m.add_mpint(self.public_numbers.n)
return m.asbytes()
def __str__(self):
# NOTE: as per inane commentary in #853, this appears to be the least
# crummy way to get a representation that prints identical to Python
# 2's previous behavior, on both interpreters.
# TODO: replace with a nice clean fingerprint display or something
if PY2:
# Can't just return the .decode below for Py2 because stuff still
# tries stuffing it into ASCII for whatever godforsaken reason
return self.asbytes()
else:
return self.asbytes().decode("utf8", errors="ignore")
def __hash__(self):
h = hash(self.get_name())
h = h * 37 + hash(self.public_numbers.e)
h = h * 37 + hash(self.public_numbers.n)
return hash(h)
def get_name(self):
return "ssh-rsa"
def get_bits(self):
return self.size
def can_sign(self):
return isinstance(self.key, rsa.RSAPrivateKey)
def sign_ssh_data(self, data):
kwargs = dict(padding=padding.PKCS1v15(), algorithm=hashes.SHA1())
if hasattr(self.key, "sign"):
sig = self.key.sign(data, **kwargs)
else:
signer = self.key.signer(**kwargs)
signer.update(data)
sig = signer.finalize()
m = Message()
m.add_string("ssh-rsa")
m.add_string(sig)
return m
def verify_ssh_sig(self, data, msg):
if msg.get_text() != "ssh-rsa":
return False
key = self.key
if isinstance(key, rsa.RSAPrivateKey):
key = key.public_key()
kwargs = dict(
signature=msg.get_binary(),
padding=padding.PKCS1v15(),
algorithm=hashes.SHA1(),
)
try:
if hasattr(key, "verify"):
key.verify(
kwargs["signature"],
data,
kwargs["padding"],
kwargs["algorithm"],
)
else:
verifier = key.verifier(**kwargs)
verifier.update(data)
verifier.verify()
except InvalidSignature:
return False
else:
return True
def write_private_key_file(self, filename, password=None):
self._write_private_key_file(
filename,
self.key,
serialization.PrivateFormat.TraditionalOpenSSL,
password=password,
)
def write_private_key(self, file_obj, password=None):
self._write_private_key(
file_obj,
self.key,
serialization.PrivateFormat.TraditionalOpenSSL,
password=password,
)
@staticmethod
def generate(bits, progress_func=None):
"""
Generate a new private RSA key. This factory function can be used to
generate a new host key or authentication key.
:param int bits: number of bits the generated key should be.
:param progress_func: Unused
:return: new `.RSAKey` private key
"""
key = rsa.generate_private_key(
public_exponent=65537, key_size=bits, backend=default_backend()
)
return RSAKey(key=key)
# ...internals...
def _from_private_key_file(self, filename, password):
data = self._read_private_key_file("RSA", filename, password)
self._decode_key(data)
def _from_private_key(self, file_obj, password):
data = self._read_private_key("RSA", file_obj, password)
self._decode_key(data)
def _decode_key(self, data):
try:
key = serialization.load_der_private_key(
data, password=None, backend=default_backend()
)
except ValueError as e:
raise SSHException(str(e))
assert isinstance(key, rsa.RSAPrivateKey)
self.key = key
|
