paramiko/tests/test_util.py

# Copyright (C) 2003-2009  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.

"""
Some unit tests for utility functions.
"""

from binascii import hexlify
import cStringIO
import errno
import os
import unittest
from Crypto.Hash import SHA
import paramiko.util

from util import ParamikoTest

test_config_file = """\
Host *
    User robey
    IdentityFile    =~/.ssh/id_rsa

# comment
Host *.example.com
    \tUser bjork
Port=3333
Host *
 \t  \t Crazy something dumb  
Host spoo.example.com
Crazy something else
"""

test_hosts_file = """\
secure.example.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEA1PD6U2/TVxET6lkpKhOk5r\
9q/kAYG6sP9f5zuUYP8i7FOFp/6ncCEbbtg/lB+A3iidyxoSWl+9jtoyyDOOVX4UIDV9G11Ml8om3\
D+jrpI9cycZHqilK0HmxDeCuxbwyMuaCygU9gS2qoRvNLWZk70OpIKSSpBo0Wl3/XUmz9uhc=
happy.example.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEA8bP1ZA7DCZDB9J0s50l31M\
BGQ3GQ/Fc7SX6gkpXkwcZryoi4kNFhHu5LvHcZPdxXV1D+uTMfGS1eyd2Yz/DoNWXNAl8TI0cAsW\
5ymME3bQ4J/k1IKxCtz/bAlAqFgKoc+EolMziDYqWIATtW0rYTJvzGAzTmMj80/QpsFH+Pc2M=
"""


# for test 1:
from paramiko import *


class UtilTest(ParamikoTest):
    def test_1_import(self):
        """
        verify that all the classes can be imported from paramiko.
        """
        symbols = globals().keys()
        self.assertTrue('Transport' in symbols)
        self.assertTrue('SSHClient' in symbols)
        self.assertTrue('MissingHostKeyPolicy' in symbols)
        self.assertTrue('AutoAddPolicy' in symbols)
        self.assertTrue('RejectPolicy' in symbols)
        self.assertTrue('WarningPolicy' in symbols)
        self.assertTrue('SecurityOptions' in symbols)
        self.assertTrue('SubsystemHandler' in symbols)
        self.assertTrue('Channel' in symbols)
        self.assertTrue('RSAKey' in symbols)
        self.assertTrue('DSSKey' in symbols)
        self.assertTrue('Message' in symbols)
        self.assertTrue('SSHException' in symbols)
        self.assertTrue('AuthenticationException' in symbols)
        self.assertTrue('PasswordRequiredException' in symbols)
        self.assertTrue('BadAuthenticationType' in symbols)
        self.assertTrue('ChannelException' in symbols)
        self.assertTrue('SFTP' in symbols)
        self.assertTrue('SFTPFile' in symbols)
        self.assertTrue('SFTPHandle' in symbols)
        self.assertTrue('SFTPClient' in symbols)
        self.assertTrue('SFTPServer' in symbols)
        self.assertTrue('SFTPError' in symbols)
        self.assertTrue('SFTPAttributes' in symbols)
        self.assertTrue('SFTPServerInterface' in symbols)
        self.assertTrue('ServerInterface' in symbols)
        self.assertTrue('BufferedFile' in symbols)
        self.assertTrue('Agent' in symbols)
        self.assertTrue('AgentKey' in symbols)
        self.assertTrue('HostKeys' in symbols)
        self.assertTrue('SSHConfig' in symbols)
        self.assertTrue('util' in symbols)

    def test_2_parse_config(self):
        global test_config_file
        f = cStringIO.StringIO(test_config_file)
        config = paramiko.util.parse_ssh_config(f)
        self.assertEquals(config._config,
                          [ {'identityfile': '~/.ssh/id_rsa', 'host': '*', 'user': 'robey',
                             'crazy': 'something dumb  '},
                            {'host': '*.example.com', 'user': 'bjork', 'port': '3333'},
                            {'host': 'spoo.example.com', 'crazy': 'something else'}])

    def test_3_host_config(self):
        global test_config_file
        f = cStringIO.StringIO(test_config_file)
        config = paramiko.util.parse_ssh_config(f)
        for host, values in {
            'irc.danger.com': {'user': 'robey', 'crazy': 'something dumb  '},
            'irc.example.com': {'user': 'bjork', 'crazy': 'something dumb  ', 'port': '3333'},
            'spoo.example.com': {'user': 'bjork', 'crazy': 'something else', 'port': '3333'}
        }.items():
            values = dict(values,
                hostname=host,
                identityfile=os.path.expanduser("~/.ssh/id_rsa")
            )
            self.assertEquals(
                paramiko.util.lookup_ssh_host_config(host, config),
                values
            )

    def test_4_generate_key_bytes(self):
        x = paramiko.util.generate_key_bytes(SHA, 'ABCDEFGH', 'This is my secret passphrase.', 64)
        hex = ''.join(['%02x' % ord(c) for c in x])
        self.assertEquals(hex, '9110e2f6793b69363e58173e9436b13a5a4b339005741d5c680e505f57d871347b4239f14fb5c46e857d5e100424873ba849ac699cea98d729e57b3e84378e8b')

    def test_5_host_keys(self):
        f = open('hostfile.temp', 'w')
        f.write(test_hosts_file)
        f.close()
        try:
            hostdict = paramiko.util.load_host_keys('hostfile.temp')
            self.assertEquals(2, len(hostdict))
            self.assertEquals(1, len(hostdict.values()[0]))
            self.assertEquals(1, len(hostdict.values()[1]))
            fp = hexlify(hostdict['secure.example.com']['ssh-rsa'].get_fingerprint()).upper()
            self.assertEquals('E6684DB30E109B67B70FF1DC5C7F1363', fp)
        finally:
            os.unlink('hostfile.temp')

    def test_6_random(self):
        from paramiko.common import rng
        # just verify that we can pull out 32 bytes and not get an exception.
        x = rng.read(32)
        self.assertEquals(len(x), 32)
        
    def test_7_host_config_expose_issue_33(self):
        test_config_file = """
Host www13.*
    Port 22

Host *.example.com
    Port 2222

Host *
    Port 3333
    """
        f = cStringIO.StringIO(test_config_file)
        config = paramiko.util.parse_ssh_config(f)
        host = 'www13.example.com'
        self.assertEquals(
            paramiko.util.lookup_ssh_host_config(host, config),
            {'hostname': host, 'port': '22'}
        )

    def test_8_eintr_retry(self):
        self.assertEquals('foo', paramiko.util.retry_on_signal(lambda: 'foo'))

        # Variables that are set by raises_intr
        intr_errors_remaining = [3]
        call_count = [0]
        def raises_intr():
            call_count[0] += 1
            if intr_errors_remaining[0] > 0:
                intr_errors_remaining[0] -= 1
                raise IOError(errno.EINTR, 'file', 'interrupted system call')
        self.assertTrue(paramiko.util.retry_on_signal(raises_intr) is None)
        self.assertEquals(0, intr_errors_remaining[0])
        self.assertEquals(4, call_count[0])

        def raises_ioerror_not_eintr():
            raise IOError(errno.ENOENT, 'file', 'file not found')
        self.assertRaises(IOError,
                          lambda: paramiko.util.retry_on_signal(raises_ioerror_not_eintr))

        def raises_other_exception():
            raise AssertionError('foo')
        self.assertRaises(AssertionError,
                          lambda: paramiko.util.retry_on_signal(raises_other_exception))