/usr/lib/python2.7/dist-packages/twisted/conch/test/test_ckeygen.py is in python-twisted-conch 1:13.2.0-1ubuntu1.
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# See LICENSE for details.
"""
Tests for L{twisted.conch.scripts.ckeygen}.
"""
import getpass
import sys
from StringIO import StringIO
try:
import Crypto
import pyasn1
except ImportError:
skip = "PyCrypto and pyasn1 required for twisted.conch.scripts.ckeygen."
else:
from twisted.conch.ssh.keys import Key, BadKeyError
from twisted.conch.scripts.ckeygen import (
changePassPhrase, displayPublicKey, printFingerprint, _saveKey)
from twisted.python.filepath import FilePath
from twisted.trial.unittest import TestCase
from twisted.conch.test.keydata import (
publicRSA_openssh, privateRSA_openssh, privateRSA_openssh_encrypted)
def makeGetpass(*passphrases):
"""
Return a callable to patch C{getpass.getpass}. Yields a passphrase each
time called. Use case is to provide an old, then new passphrase(s) as if
requested interactively.
@param passphrases: The list of passphrases returned, one per each call.
"""
passphrases = iter(passphrases)
def fakeGetpass(_):
return passphrases.next()
return fakeGetpass
class KeyGenTests(TestCase):
"""
Tests for various functions used to implement the I{ckeygen} script.
"""
def setUp(self):
"""
Patch C{sys.stdout} with a L{StringIO} instance to tests can make
assertions about what's printed.
"""
self.stdout = StringIO()
self.patch(sys, 'stdout', self.stdout)
def test_printFingerprint(self):
"""
L{printFingerprint} writes a line to standard out giving the number of
bits of the key, its fingerprint, and the basename of the file from it
was read.
"""
filename = self.mktemp()
FilePath(filename).setContent(publicRSA_openssh)
printFingerprint({'filename': filename})
self.assertEqual(
self.stdout.getvalue(),
'768 3d:13:5f:cb:c9:79:8a:93:06:27:65:bc:3d:0b:8f:af temp\n')
def test_saveKey(self):
"""
L{_saveKey} writes the private and public parts of a key to two
different files and writes a report of this to standard out.
"""
base = FilePath(self.mktemp())
base.makedirs()
filename = base.child('id_rsa').path
key = Key.fromString(privateRSA_openssh)
_saveKey(
key.keyObject,
{'filename': filename, 'pass': 'passphrase'})
self.assertEqual(
self.stdout.getvalue(),
"Your identification has been saved in %s\n"
"Your public key has been saved in %s.pub\n"
"The key fingerprint is:\n"
"3d:13:5f:cb:c9:79:8a:93:06:27:65:bc:3d:0b:8f:af\n" % (
filename,
filename))
self.assertEqual(
key.fromString(
base.child('id_rsa').getContent(), None, 'passphrase'),
key)
self.assertEqual(
Key.fromString(base.child('id_rsa.pub').getContent()),
key.public())
def test_saveKeyEmptyPassphrase(self):
"""
L{_saveKey} will choose an empty string for the passphrase if
no-passphrase is C{True}.
"""
base = FilePath(self.mktemp())
base.makedirs()
filename = base.child('id_rsa').path
key = Key.fromString(privateRSA_openssh)
_saveKey(
key.keyObject,
{'filename': filename, 'no-passphrase': True})
self.assertEqual(
key.fromString(
base.child('id_rsa').getContent(), None, b''),
key)
def test_displayPublicKey(self):
"""
L{displayPublicKey} prints out the public key associated with a given
private key.
"""
filename = self.mktemp()
pubKey = Key.fromString(publicRSA_openssh)
FilePath(filename).setContent(privateRSA_openssh)
displayPublicKey({'filename': filename})
self.assertEqual(
self.stdout.getvalue().strip('\n'),
pubKey.toString('openssh'))
def test_displayPublicKeyEncrypted(self):
"""
L{displayPublicKey} prints out the public key associated with a given
private key using the given passphrase when it's encrypted.
"""
filename = self.mktemp()
pubKey = Key.fromString(publicRSA_openssh)
FilePath(filename).setContent(privateRSA_openssh_encrypted)
displayPublicKey({'filename': filename, 'pass': 'encrypted'})
self.assertEqual(
self.stdout.getvalue().strip('\n'),
pubKey.toString('openssh'))
def test_displayPublicKeyEncryptedPassphrasePrompt(self):
"""
L{displayPublicKey} prints out the public key associated with a given
private key, asking for the passphrase when it's encrypted.
"""
filename = self.mktemp()
pubKey = Key.fromString(publicRSA_openssh)
FilePath(filename).setContent(privateRSA_openssh_encrypted)
self.patch(getpass, 'getpass', lambda x: 'encrypted')
displayPublicKey({'filename': filename})
self.assertEqual(
self.stdout.getvalue().strip('\n'),
pubKey.toString('openssh'))
def test_displayPublicKeyWrongPassphrase(self):
"""
L{displayPublicKey} fails with a L{BadKeyError} when trying to decrypt
an encrypted key with the wrong password.
"""
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh_encrypted)
self.assertRaises(
BadKeyError, displayPublicKey,
{'filename': filename, 'pass': 'wrong'})
def test_changePassphrase(self):
"""
L{changePassPhrase} allows a user to change the passphrase of a
private key interactively.
"""
oldNewConfirm = makeGetpass('encrypted', 'newpass', 'newpass')
self.patch(getpass, 'getpass', oldNewConfirm)
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh_encrypted)
changePassPhrase({'filename': filename})
self.assertEqual(
self.stdout.getvalue().strip('\n'),
'Your identification has been saved with the new passphrase.')
self.assertNotEqual(privateRSA_openssh_encrypted,
FilePath(filename).getContent())
def test_changePassphraseWithOld(self):
"""
L{changePassPhrase} allows a user to change the passphrase of a
private key, providing the old passphrase and prompting for new one.
"""
newConfirm = makeGetpass('newpass', 'newpass')
self.patch(getpass, 'getpass', newConfirm)
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh_encrypted)
changePassPhrase({'filename': filename, 'pass': 'encrypted'})
self.assertEqual(
self.stdout.getvalue().strip('\n'),
'Your identification has been saved with the new passphrase.')
self.assertNotEqual(privateRSA_openssh_encrypted,
FilePath(filename).getContent())
def test_changePassphraseWithBoth(self):
"""
L{changePassPhrase} allows a user to change the passphrase of a private
key by providing both old and new passphrases without prompting.
"""
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh_encrypted)
changePassPhrase(
{'filename': filename, 'pass': 'encrypted',
'newpass': 'newencrypt'})
self.assertEqual(
self.stdout.getvalue().strip('\n'),
'Your identification has been saved with the new passphrase.')
self.assertNotEqual(privateRSA_openssh_encrypted,
FilePath(filename).getContent())
def test_changePassphraseWrongPassphrase(self):
"""
L{changePassPhrase} exits if passed an invalid old passphrase when
trying to change the passphrase of a private key.
"""
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh_encrypted)
error = self.assertRaises(
SystemExit, changePassPhrase,
{'filename': filename, 'pass': 'wrong'})
self.assertEqual('Could not change passphrase: old passphrase error',
str(error))
self.assertEqual(privateRSA_openssh_encrypted,
FilePath(filename).getContent())
def test_changePassphraseEmptyGetPass(self):
"""
L{changePassPhrase} exits if no passphrase is specified for the
C{getpass} call and the key is encrypted.
"""
self.patch(getpass, 'getpass', makeGetpass(''))
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh_encrypted)
error = self.assertRaises(
SystemExit, changePassPhrase, {'filename': filename})
self.assertEqual(
'Could not change passphrase: Passphrase must be provided '
'for an encrypted key',
str(error))
self.assertEqual(privateRSA_openssh_encrypted,
FilePath(filename).getContent())
def test_changePassphraseBadKey(self):
"""
L{changePassPhrase} exits if the file specified points to an invalid
key.
"""
filename = self.mktemp()
FilePath(filename).setContent('foobar')
error = self.assertRaises(
SystemExit, changePassPhrase, {'filename': filename})
self.assertEqual(
"Could not change passphrase: cannot guess the type of 'foobar'",
str(error))
self.assertEqual('foobar', FilePath(filename).getContent())
def test_changePassphraseCreateError(self):
"""
L{changePassPhrase} doesn't modify the key file if an unexpected error
happens when trying to create the key with the new passphrase.
"""
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh)
def toString(*args, **kwargs):
raise RuntimeError('oops')
self.patch(Key, 'toString', toString)
error = self.assertRaises(
SystemExit, changePassPhrase,
{'filename': filename,
'newpass': 'newencrypt'})
self.assertEqual(
'Could not change passphrase: oops', str(error))
self.assertEqual(privateRSA_openssh, FilePath(filename).getContent())
def test_changePassphraseEmptyStringError(self):
"""
L{changePassPhrase} doesn't modify the key file if C{toString} returns
an empty string.
"""
filename = self.mktemp()
FilePath(filename).setContent(privateRSA_openssh)
def toString(*args, **kwargs):
return ''
self.patch(Key, 'toString', toString)
error = self.assertRaises(
SystemExit, changePassPhrase,
{'filename': filename, 'newpass': 'newencrypt'})
self.assertEqual(
"Could not change passphrase: "
"cannot guess the type of ''", str(error))
self.assertEqual(privateRSA_openssh, FilePath(filename).getContent())
def test_changePassphrasePublicKey(self):
"""
L{changePassPhrase} exits when trying to change the passphrase on a
public key, and doesn't change the file.
"""
filename = self.mktemp()
FilePath(filename).setContent(publicRSA_openssh)
error = self.assertRaises(
SystemExit, changePassPhrase,
{'filename': filename, 'newpass': 'pass'})
self.assertEqual(
'Could not change passphrase: key not encrypted', str(error))
self.assertEqual(publicRSA_openssh, FilePath(filename).getContent())
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