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# Copyright (c) 2009 Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.conch.client.default}.
"""
try:
import Crypto.Cipher.DES3
import pyasn1
except ImportError:
skip = "PyCrypto and PyASN1 required for twisted.conch.client.default."
else:
from twisted.conch.client.agent import SSHAgentClient
from twisted.conch.client.default import SSHUserAuthClient
from twisted.conch.client.options import ConchOptions
from twisted.conch.ssh.keys import Key
from twisted.trial.unittest import TestCase
from twisted.python.filepath import FilePath
from twisted.conch.test import keydata
from twisted.test.proto_helpers import StringTransport
class SSHUserAuthClientTest(TestCase):
"""
Tests for L{SSHUserAuthClient}.
@type rsaPublic: L{Key}
@ivar rsaPublic: A public RSA key.
"""
def setUp(self):
self.rsaPublic = Key.fromString(keydata.publicRSA_openssh)
self.tmpdir = FilePath(self.mktemp())
self.tmpdir.makedirs()
self.rsaFile = self.tmpdir.child('id_rsa')
self.rsaFile.setContent(keydata.privateRSA_openssh)
self.tmpdir.child('id_rsa.pub').setContent(keydata.publicRSA_openssh)
def test_signDataWithAgent(self):
"""
When connected to an agent, L{SSHUserAuthClient} can use it to
request signatures of particular data with a particular L{Key}.
"""
client = SSHUserAuthClient("user", ConchOptions(), None)
agent = SSHAgentClient()
transport = StringTransport()
agent.makeConnection(transport)
client.keyAgent = agent
cleartext = "Sign here"
client.signData(self.rsaPublic, cleartext)
self.assertEquals(
transport.value(),
"\x00\x00\x00\x8b\r\x00\x00\x00u" + self.rsaPublic.blob() +
"\x00\x00\x00\t" + cleartext +
"\x00\x00\x00\x00")
def test_agentGetPublicKey(self):
"""
L{SSHUserAuthClient} looks up public keys from the agent using the
L{SSHAgentClient} class. That L{SSHAgentClient.getPublicKey} returns a
L{Key} object with one of the public keys in the agent. If no more
keys are present, it returns C{None}.
"""
agent = SSHAgentClient()
agent.blobs = [self.rsaPublic.blob()]
key = agent.getPublicKey()
self.assertEquals(key.isPublic(), True)
self.assertEquals(key, self.rsaPublic)
self.assertEquals(agent.getPublicKey(), None)
def test_getPublicKeyFromFile(self):
"""
L{SSHUserAuthClient.getPublicKey()} is able to get a public key from
the first file described by its options' C{identitys} list, and return
the corresponding public L{Key} object.
"""
options = ConchOptions()
options.identitys = [self.rsaFile.path]
client = SSHUserAuthClient("user", options, None)
key = client.getPublicKey()
self.assertEquals(key.isPublic(), True)
self.assertEquals(key, self.rsaPublic)
def test_getPublicKeyAgentFallback(self):
"""
If an agent is present, but doesn't return a key,
L{SSHUserAuthClient.getPublicKey} continue with the normal key lookup.
"""
options = ConchOptions()
options.identitys = [self.rsaFile.path]
agent = SSHAgentClient()
client = SSHUserAuthClient("user", options, None)
client.keyAgent = agent
key = client.getPublicKey()
self.assertEquals(key.isPublic(), True)
self.assertEquals(key, self.rsaPublic)
def test_getPublicKeyBadKeyError(self):
"""
If L{keys.Key.fromFile} raises a L{keys.BadKeyError}, the
L{SSHUserAuthClient.getPublicKey} tries again to get a public key by
calling itself recursively.
"""
options = ConchOptions()
self.tmpdir.child('id_dsa.pub').setContent(keydata.publicDSA_openssh)
dsaFile = self.tmpdir.child('id_dsa')
dsaFile.setContent(keydata.privateDSA_openssh)
options.identitys = [self.rsaFile.path, dsaFile.path]
self.tmpdir.child('id_rsa.pub').setContent('not a key!')
client = SSHUserAuthClient("user", options, None)
key = client.getPublicKey()
self.assertEquals(key.isPublic(), True)
self.assertEquals(key, Key.fromString(keydata.publicDSA_openssh))
self.assertEquals(client.usedFiles, [self.rsaFile.path, dsaFile.path])
def test_getPrivateKey(self):
"""
L{SSHUserAuthClient.getPrivateKey} will load a private key from the
last used file populated by L{SSHUserAuthClient.getPublicKey}, and
return a L{Deferred} which fires with the corresponding private L{Key}.
"""
rsaPrivate = Key.fromString(keydata.privateRSA_openssh)
options = ConchOptions()
options.identitys = [self.rsaFile.path]
client = SSHUserAuthClient("user", options, None)
# Populate the list of used files
client.getPublicKey()
def _cbGetPrivateKey(key):
self.assertEquals(key.isPublic(), False)
self.assertEquals(key, rsaPrivate)
return client.getPrivateKey().addCallback(_cbGetPrivateKey)
def test_getPrivateKeyPassphrase(self):
"""
L{SSHUserAuthClient} can get a private key from a file, and return a
Deferred called back with a private L{Key} object, even if the key is
encrypted.
"""
rsaPrivate = Key.fromString(keydata.privateRSA_openssh)
passphrase = 'this is the passphrase'
self.rsaFile.setContent(rsaPrivate.toString('openssh', passphrase))
options = ConchOptions()
options.identitys = [self.rsaFile.path]
client = SSHUserAuthClient("user", options, None)
# Populate the list of used files
client.getPublicKey()
def _getPassword(prompt):
self.assertEquals(prompt,
"Enter passphrase for key '%s': " % (
self.rsaFile.path,))
return passphrase
def _cbGetPrivateKey(key):
self.assertEquals(key.isPublic(), False)
self.assertEquals(key, rsaPrivate)
self.patch(client, '_getPassword', _getPassword)
return client.getPrivateKey().addCallback(_cbGetPrivateKey)
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