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|
import traceback
import binascii
import base64
import sys
try:
from hashlib import md5 as MD5
except ImportError:
from md5 import md5 as MD5
limited = True
PY3 = sys.version_info[0] == 3
if PY3:
from io import StringIO
else:
from StringIO import StringIO
class Object(object):
pass
try:
from Crypto.Cipher import DES3, AES
except ImportError:
AES = Object()
AES.MODE_CBC = ""
DES3 = Object()
DES3.MODE_CBC = ""
limited = True
class BERException (Exception):
pass
class BER(object):
"""
Robey's tiny little attempt at a BER decoder.
"""
def __init__(self, content=''):
self.content = content
self.idx = 0
def __str__(self):
return self.content
def __repr__(self):
return 'BER(\'' + repr(self.content) + '\')'
def decode(self):
return self.decode_next()
def decode_next(self):
if self.idx >= len(self.content):
return None
ident = ord(self.content[self.idx])
self.idx += 1
if (ident & 31) == 31:
ident = 0
while self.idx < len(self.content):
t = ord(self.content[self.idx])
self.idx += 1
ident = (ident << 7) | (t & 0x7f)
if not (t & 0x80):
break
if self.idx >= len(self.content):
return None
size = ord(self.content[self.idx])
self.idx += 1
if size & 0x80:
t = size & 0x7f
if self.idx + t > len(self.content):
return None
size = inflate_long(self.content[self.idx: self.idx + t], True)
self.idx += t
if self.idx + size > len(self.content):
return None
data = self.content[self.idx: self.idx + size]
self.idx += size
if ident == 0x30:
return self.decode_sequence(data)
elif ident == 2:
return inflate_long(data)
else:
raise BERException('Unknown ber encoding type %d (robey is lazy)' % ident)
def decode_sequence(data):
out = []
b = BER(data)
while True:
x = b.decode_next()
if x is None:
break
out.append(x)
return out
decode_sequence = staticmethod(decode_sequence)
class SSHException (Exception):
"""
Exception raised by failures in SSH2 protocol negotiation or logic errors.
"""
pass
class AuthenticationException (SSHException):
"""
Exception raised when authentication failed for some reason. It may be
possible to retry with different credentials. (Other classes specify more
specific reasons.)
@since: 1.6
"""
pass
class PasswordRequiredException (AuthenticationException):
"""
Exception raised when a password is needed to unlock a private key file.
"""
pass
class BadAuthenticationType (AuthenticationException):
"""
Exception raised when an authentication type (like password) is used, but
the server isn't allowing that type. (It may only allow public-key, for
example.)
@ivar allowed_types: list of allowed authentication types provided by the
server (possible values are: C{"none"}, C{"password"}, and
C{"publickey"}).
@type allowed_types: list
@since: 1.1
"""
allowed_types = []
def __init__(self, explanation, types):
AuthenticationException.__init__(self, explanation)
self.allowed_types = types
def __str__(self):
return SSHException.__str__(self) + ' (allowed_types=%r)' % self.allowed_types
class PartialAuthentication (AuthenticationException):
"""
An internal exception thrown in the case of partial authentication.
"""
allowed_types = []
def __init__(self, types):
AuthenticationException.__init__(self, 'partial authentication')
self.allowed_types = types
class ChannelException (SSHException):
"""
Exception raised when an attempt to open a new L{Channel} fails.
@ivar code: the error code returned by the server
@type code: int
@since: 1.6
"""
def __init__(self, code, text):
SSHException.__init__(self, text)
self.code = code
class BadHostKeyException (SSHException):
"""
The host key given by the SSH server did not match what we were expecting.
@ivar hostname: the hostname of the SSH server
@type hostname: str
@ivar key: the host key presented by the server
@type key: L{PKey}
@ivar expected_key: the host key expected
@type expected_key: L{PKey}
@since: 1.6
"""
def __init__(self, hostname, got_key, expected_key):
SSHException.__init__(self, 'Host key for server %s does not match!' % hostname)
self.hostname = hostname
self.key = got_key
self.expected_key = expected_key
from binascii import hexlify, unhexlify
import struct
def inflate_long(s, always_positive=False):
"""turns a normalized byte string into a long-int
(adapted from Crypto.Util.number)"""
out = 0
negative = 0
if not always_positive and (len(s) > 0) and (ord(s[0]) >= 0x80):
negative = 1
if len(s) % 4:
filler = '\x00'
if negative:
filler = '\xff'
s = filler * (4 - len(s) % 4) + s
for i in range(0, len(s), 4):
out = (out << 32) + struct.unpack('>I', s[i:i + 4])[0]
if negative:
out -= (1 << (8 * len(s)))
return out
def deflate_long(n, add_sign_padding=True):
"turns a long-int into a normalized byte string (adapted from Crypto.Util.number)"
s = ''
n = long(n)
while (n != 0) and (n != -1):
s = struct.pack('>I', n & 0xffffffff) + s
n = n >> 32
for i in enumerate(s):
if (n == 0) and (i[1] != '\000'):
break
if (n == -1) and (i[1] != '\xff'):
break
else:
i = (0,)
if n == 0:
s = '\000'
else:
s = '\xff'
s = s[i[0]:]
if add_sign_padding:
if (n == 0) and (ord(s[0]) >= 0x80):
s = '\x00' + s
if (n == -1) and (ord(s[0]) < 0x80):
s = '\xff' + s
return s
def format_binary_weird(data):
out = ''
for i in enumerate(data):
out += '%02X' % ord(i[1])
if i[0] % 2:
out += ' '
if i[0] % 16 == 15:
out += '\n'
return out
def format_binary(data, prefix=''):
x = 0
out = []
while len(data) > x + 16:
out.append(format_binary_line(data[x:x + 16]))
x += 16
if x < len(data):
out.append(format_binary_line(data[x:]))
return [prefix + y for y in out]
def format_binary_line(data):
left = ' '.join(['%02X' % ord(c) for c in data])
right = ''.join([('.%c..' % c)[(ord(c) + 63) // 95] for c in data])
return '%-50s %s' % (left, right)
def hexify(s):
return hexlify(s).upper()
def unhexify(s):
return unhexlify(s)
def safe_string(s):
out = ''
for c in s:
if (ord(c) >= 32) and (ord(c) <= 127):
out += c
else:
out += '%%%02X' % ord(c)
return out
def bit_length(n):
norm = deflate_long(n, 0)
hbyte = ord(norm[0])
if hbyte == 0:
return 1
bitlen = len(norm) * 8
while not (hbyte & 0x80):
hbyte <<= 1
bitlen -= 1
return bitlen
def tb_strings():
return ''.join(traceback.format_exception(*sys.exc_info())).split('\n')
def generate_key_bytes(hashclass, salt, key, nbytes):
"""
Given a password, passphrase, or other human-source key, scramble it
through a secure hash into some keyworthy bytes. This specific algorithm
is used for encrypting/decrypting private key files.
@param hashclass: class from L{Crypto.Hash} that can be used as a secure
hashing function (like C{MD5} or C{SHA}).
@type hashclass: L{Crypto.Hash}
@param salt: data to salt the hash with.
@type salt: string
@param key: human-entered password or passphrase.
@type key: string
@param nbytes: number of bytes to generate.
@type nbytes: int
@return: key data
@rtype: string
"""
keydata = ''
digest = ''
if len(salt) > 8:
salt = salt[:8]
while nbytes > 0:
hash_obj = hashclass()
if len(digest) > 0:
hash_obj.update(digest)
hash_obj.update(key)
hash_obj.update(salt)
digest = hash_obj.digest()
size = min(nbytes, len(digest))
keydata += digest[:size]
nbytes -= size
return keydata
"""
Common API for all public keys.
"""
class PKey (object):
"""
Base class for public keys.
"""
_CIPHER_TABLE = {
'AES-128-CBC': {'cipher': AES, 'keysize': 16, 'blocksize': 16, 'mode': AES.MODE_CBC},
'DES-EDE3-CBC': {'cipher': DES3, 'keysize': 24, 'blocksize': 8, 'mode': DES3.MODE_CBC},
'AES-256-CBC': {'cipher': AES, 'keysize': 32, 'blocksize': 16, 'mode': AES.MODE_CBC},
}
def __init__(self, msg=None, data=None):
"""
Create a new instance of this public key type. If C{msg} is given,
the key's public part(s) will be filled in from the message. If
C{data} is given, the key's public part(s) will be filled in from
the string.
@param msg: an optional SSH L{Message} containing a public key of this
type.
@type msg: L{Message}
@param data: an optional string containing a public key of this type
@type data: str
@raise SSHException: if a key cannot be created from the C{data} or
C{msg} given, or no key was passed in.
"""
pass
def __str__(self):
"""
Return a string of an SSH L{Message} made up of the public part(s) of
this key. This string is suitable for passing to L{__init__} to
re-create the key object later.
@return: string representation of an SSH key message.
@rtype: str
"""
return ''
def __cmp__(self, other):
"""
Compare this key to another. Returns 0 if this key is equivalent to
the given key, or non-0 if they are different. Only the public parts
of the key are compared, so a public key will compare equal to its
corresponding private key.
@param other: key to compare to.
@type other: L{PKey}
@return: 0 if the two keys are equivalent, non-0 otherwise.
@rtype: int
"""
hs = hash(self)
ho = hash(other)
if hs != ho:
return cmp(hs, ho)
return cmp(str(self), str(other))
def get_name(self):
"""
Return the name of this private key implementation.
@return: name of this private key type, in SSH terminology (for
example, C{"ssh-rsa"}).
@rtype: str
"""
return ''
def get_bits(self):
"""
Return the number of significant bits in this key. This is useful
for judging the relative security of a key.
@return: bits in the key.
@rtype: int
"""
return 0
def can_sign(self):
"""
Return C{True} if this key has the private part necessary for signing
data.
@return: C{True} if this is a private key.
@rtype: bool
"""
return False
def get_fingerprint(self):
"""
Return an MD5 fingerprint of the public part of this key. Nothing
secret is revealed.
@return: a 16-byte string (binary) of the MD5 fingerprint, in SSH
format.
@rtype: str
"""
return MD5.new(str(self)).digest()
def get_base64(self):
"""
Return a base64 string containing the public part of this key. Nothing
secret is revealed. This format is compatible with that used to store
public key files or recognized host keys.
@return: a base64 string containing the public part of the key.
@rtype: str
"""
return base64.encodestring(str(self)).replace('\n', '')
def sign_ssh_data(self, rng, data):
"""
Sign a blob of data with this private key, and return a L{Message}
representing an SSH signature message.
@param rng: a secure random number generator.
@type rng: L{Crypto.Util.rng.RandomPool}
@param data: the data to sign.
@type data: str
@return: an SSH signature message.
@rtype: L{Message}
"""
return ''
def verify_ssh_sig(self, data, msg):
"""
Given a blob of data, and an SSH message representing a signature of
that data, verify that it was signed with this key.
@param data: the data that was signed.
@type data: str
@param msg: an SSH signature message
@type msg: L{Message}
@return: C{True} if the signature verifies correctly; C{False}
otherwise.
@rtype: boolean
"""
return False
def from_private_key_file(cls, filename, password=None):
"""
Create a key object by reading a private key file. If the private
key is encrypted and C{password} is not C{None}, the given password
will be used to decrypt the key (otherwise L{PasswordRequiredException}
is thrown). Through the magic of python, this factory method will
exist in all subclasses of PKey (such as L{RSAKey} or L{DSSKey}), but
is useless on the abstract PKey class.
@param filename: name of the file to read
@type filename: str
@param password: an optional password to use to decrypt the key file,
if it's encrypted
@type password: str
@return: a new key object based on the given private key
@rtype: L{PKey}
@raise IOError: if there was an error reading the file
@raise PasswordRequiredException: if the private key file is
encrypted, and C{password} is C{None}
@raise SSHException: if the key file is invalid
"""
key = cls(filename=filename, password=password)
return key
from_private_key_file = classmethod(from_private_key_file)
def from_private_key(cls, file_obj, password=None):
"""
Create a key object by reading a private key from a file (or file-like)
object. If the private key is encrypted and C{password} is not C{None},
the given password will be used to decrypt the key (otherwise
L{PasswordRequiredException} is thrown).
@param file_obj: the file to read from
@type file_obj: file
@param password: an optional password to use to decrypt the key, if it's
encrypted
@type password: str
@return: a new key object based on the given private key
@rtype: L{PKey}
@raise IOError: if there was an error reading the key
@raise PasswordRequiredException: if the private key file is encrypted,
and C{password} is C{None}
@raise SSHException: if the key file is invalid
"""
key = cls(file_obj=file_obj, password=password)
return key
from_private_key = classmethod(from_private_key)
def _read_private_key_file(self, tag, filename, password=None):
"""
Read an SSH2-format private key file, looking for a string of the type
C{"BEGIN xxx PRIVATE KEY"} for some C{xxx}, base64-decode the text we
find, and return it as a string. If the private key is encrypted and
C{password} is not C{None}, the given password will be used to decrypt
the key (otherwise L{PasswordRequiredException} is thrown).
@param tag: C{"RSA"} or C{"DSA"}, the tag used to mark the data block.
@type tag: str
@param filename: name of the file to read.
@type filename: str
@param password: an optional password to use to decrypt the key file,
if it's encrypted.
@type password: str
@return: data blob that makes up the private key.
@rtype: str
@raise IOError: if there was an error reading the file.
@raise PasswordRequiredException: if the private key file is
encrypted, and C{password} is C{None}.
@raise SSHException: if the key file is invalid.
"""
try:
f = open(filename, 'r')
except IOError:
e = sys.exc_info()[1]
sys.stdout.write("%s\n" % str(e))
return
data = self._read_private_key(tag, f, password)
f.close()
return data
def _read_private_key(self, tag, f, password=None):
lines = f.readlines()
if "BEGIN RSA PRIVATE" in lines[0]:
tag = "RSA"
self.type = 0
elif "-----BEGIN OPENSSH PRIVATE KEY-----" in lines[0]:
self.type = 2
else:
self.type = 1
tag = "DSA"
start = 0
while (start < len(lines)) and ((lines[start].strip() != '-----BEGIN ' + tag + ' PRIVATE KEY-----') and (lines[start].strip() != '-----BEGIN OPENSSH PRIVATE KEY-----')):
start += 1
if start >= len(lines):
sys.stdout.write("%s is not a valid private key file\n" % f.name)
return None
headers = {}
start += 1
while start < len(lines):
l = lines[start].split(': ')
if len(l) == 1:
break
headers[l[0].lower()] = l[1].strip()
start += 1
end = start
while ((lines[end].strip() != '-----END OPENSSH PRIVATE KEY-----') and (lines[end].strip() != '-----END ' + tag + ' PRIVATE KEY-----')) and (end < len(lines)):
end += 1
try:
data = ''.join(lines[start:end]).encode()
data = base64.decodestring(data)
except base64.binascii.Error:
e = sys.exc_info()[1]
raise SSHException('base64 decoding error: ' + str(e))
if 'proc-type' not in headers and self.type != 2:
sys.stderr.write("%s has no password!\n" % f.name)
return None
if self.type != 2 and headers['proc-type'] != '4,ENCRYPTED':
raise SSHException('Unknown private key structure "%s"' % headers['proc-type'])
try:
encryption_type, saltstr = headers['dek-info'].split(',')
except:
if self.type != 2:
raise SSHException('Can\'t parse DEK-info in private key file')
else:
encryption_type = "AES-256-CBC"
saltstr = "fefe"
if encryption_type not in self._CIPHER_TABLE:
raise SSHException('Unknown private key cipher "%s"' % encryption_type)
if password is None:
raise PasswordRequiredException('Private key file is encrypted')
cipher = self._CIPHER_TABLE[encryption_type]['cipher']
keysize = self._CIPHER_TABLE[encryption_type]['keysize']
mode = self._CIPHER_TABLE[encryption_type]['mode']
salt = unhexlify(saltstr)
if self.type == 2:
salt_offset = 47
salt_length = 16
saltstr = data[salt_offset:salt_offset+salt_length].encode("hex")
data = binascii.hexlify(data).decode("ascii")
if keysize == 24:
self.hashline = "%s:$sshng$%s$%s$%s$%s$%s" % (f.name, 0,
len(salt), saltstr, len(data) // 2, data)
elif keysize == 16:
self.hashline = "%s:$sshng$%s$%s$%s$%s$%s" % (f.name, 1, len(saltstr) // 2,
saltstr, len(data) // 2, data)
elif keysize == 32 and self.type == 2:
rounds = 16
self.hashline = "%s:$sshng$%s$%s$%s$%s$%s$%d" % (f.name, 2, len(saltstr) // 2,
saltstr, len(data) // 2, data, rounds)
else:
sys.stderr.write("%s uses unsupported cipher, please file a bug!\n" % f.name)
return None
if not limited:
key = generate_key_bytes(MD5, salt, password, keysize)
data = cipher.new(key, mode, salt).decrypt(data)
try:
d = PKCS7Encoder()
ddata = d.decode(data)
return ddata
except ValueError:
return data
return self.hashline
def chunks(l, n):
for i in xrange(0, len(l), n):
yield l[i:i + n]
class RSADSSKey (PKey):
def __init__(self, msg=None, data=None, filename=None, password=None, vals=None, file_obj=None):
self.n = None
self.e = None
self.d = None
self.p = None
self.q = 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 vals is not None:
self.e, self.n = vals
self.size = bit_length(self.n)
def __hash__(self):
h = hash(self.get_name())
h = h * 37 + hash(self.e)
h = h * 37 + hash(self.n)
return hash(h)
def get_name(self):
return 'ssh-rsa'
def get_bits(self):
return self.size
def _from_private_key_file(self, filename, password):
data = self._read_private_key_file('RSA', filename, password)
if not data:
return
if limited:
sys.stdout.write("%s\n" % self.hashline)
return
try:
if self.type == 0:
self._decode_key(data)
else:
self._decode_dss_key(data)
sys.stderr.write("%s has no password!\n" % filename)
except SSHException:
sys.stdout.write("%s\n" % self.hashline)
def _from_private_key(self, file_obj, password):
"""used for converting older format hashes"""
data = self._read_private_key('RSA', file_obj, password)
if limited:
sys.stdout.write("%s\n" % self.hashline)
return
try:
if self.type == 0:
self._decode_key(data)
else:
self._decode_dss_key(data)
sys.stderr.write("%s has no password!\n" % file_obj.name)
except SSHException:
sys.stdout.write("%s\n" % self.hashline)
def _decode_key(self, data):
try:
keylist = BER(data).decode()
except BERException:
raise SSHException('Unable to parse key file')
if (type(keylist) is not list) or (len(keylist) < 4) or (keylist[0] != 0):
raise SSHException('Not a valid RSA private key file (bad ber encoding)')
self.n = keylist[1]
self.e = keylist[2]
self.d = keylist[3]
self.p = keylist[4]
self.q = keylist[5]
self.size = bit_length(self.n)
def _decode_dss_key(self, data):
try:
keylist = BER(data).decode()
except BERException:
e = sys.exc_info()[1]
raise SSHException('Unable to parse key file: ' + str(e))
if (type(keylist) is not list) or (len(keylist) < 6) or \
(keylist[0] != 0):
raise SSHException('not a valid DSA private key file (bad ber encoding)')
self.p = keylist[1]
self.q = keylist[2]
self.g = keylist[3]
self.y = keylist[4]
self.x = keylist[5]
self.size = bit_length(self.p)
class PKCS7Encoder(object):
'''
RFC 2315: PKCS#7 page 21
Some content-encryption algorithms assume the
input length is a multiple of k octets, where k > 1, and
let the application define a method for handling inputs
whose lengths are not a multiple of k octets. For such
algorithms, the method shall be to pad the input at the
trailing end with k - (l mod k) octets all having value k -
(l mod k), where l is the length of the input. In other
words, the input is padded at the trailing end with one of
the following strings:
01 -- if l mod k = k-1
02 02 -- if l mod k = k-2
.
.
.
k k ... k k -- if l mod k = 0
The padding can be removed unambiguously since all input is
padded and no padding string is a suffix of another. This
padding method is well-defined if and only if k < 256;
methods for larger k are an open issue for further study.
'''
def __init__(self, k=16):
self.k = k
def decode(self, text):
'''
Remove the PKCS#7 padding from a text string
'''
nl = len(text)
val = int(binascii.hexlify(text[-1]), 16)
if val > self.k:
raise ValueError('Input is not padded or padding is corrupt')
l = nl - val
return text[:l]
def encode(self, text):
'''
Pad an input string according to PKCS#7
'''
l = len(text)
output = StringIO()
val = self.k - (l % self.k)
for _ in xrange(val):
output.write('%02x' % val)
return text + binascii.unhexlify(output.getvalue())
if __name__ == "__main__":
if len(sys.argv) < 2:
sys.stdout.write("Usage: %s < RSA/DSA private key files >\n" % \
sys.argv[0])
for filename in sys.argv[1:]:
key = RSADSSKey.from_private_key_file(filename, '')
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