1
# Copyright (C) 2006-2010 Robey Pointer <robey@lag.net>
1
# Copyright (C) 2005 Robey Pointer <robey@lag.net>
2
2
# Copyright (C) 2005, 2006, 2007 Canonical Ltd
4
4
# This program is free software; you can redistribute it and/or modify
14
14
# You should have received a copy of the GNU General Public License
15
15
# along with this program; if not, write to the Free Software
16
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
18
"""Foundation SSH support for SFTP and smart server."""
95
94
vendor = self._ssh_vendors[vendor_name]
97
vendor = self._get_vendor_from_path(vendor_name)
99
raise errors.UnknownSSH(vendor_name)
100
vendor.executable_path = vendor_name
96
raise errors.UnknownSSH(vendor_name)
113
109
stdout = stderr = ''
114
110
return stdout + stderr
116
def _get_vendor_by_version_string(self, version, progname):
112
def _get_vendor_by_version_string(self, version, args):
117
113
"""Return the vendor or None based on output from the subprocess.
119
115
:param version: The output of 'ssh -V' like command.
126
122
elif 'SSH Secure Shell' in version:
127
123
trace.mutter('ssh implementation is SSH Corp.')
128
124
vendor = SSHCorpSubprocessVendor()
129
# As plink user prompts are not handled currently, don't auto-detect
130
# it by inspection below, but keep this vendor detection for if a path
131
# is given in BZR_SSH. See https://bugs.launchpad.net/bugs/414743
132
elif 'plink' in version and progname == 'plink':
125
elif 'plink' in version and args[0] == 'plink':
133
126
# Checking if "plink" was the executed argument as Windows
134
127
# sometimes reports 'ssh -V' incorrectly with 'plink' in it's
135
128
# version. See https://bugs.launchpad.net/bzr/+bug/107155
140
133
def _get_vendor_by_inspection(self):
141
134
"""Return the vendor or None by checking for known SSH implementations."""
142
version = self._get_ssh_version_string(['ssh', '-V'])
143
return self._get_vendor_by_version_string(version, "ssh")
145
def _get_vendor_from_path(self, path):
146
"""Return the vendor or None using the program at the given path"""
147
version = self._get_ssh_version_string([path, '-V'])
148
return self._get_vendor_by_version_string(version,
149
os.path.splitext(os.path.basename(path))[0])
135
for args in (['ssh', '-V'], ['plink', '-V']):
136
version = self._get_ssh_version_string(args)
137
vendor = self._get_vendor_by_version_string(version, args)
138
if vendor is not None:
151
142
def get_vendor(self, environment=None):
152
143
"""Find out what version of SSH is on the system.
173
164
register_ssh_vendor = _ssh_vendor_manager.register_vendor
176
def _ignore_signals():
167
def _ignore_sigint():
177
168
# TODO: This should possibly ignore SIGHUP as well, but bzr currently
178
169
# doesn't handle it itself.
179
170
# <https://launchpad.net/products/bzr/+bug/41433/+index>
181
172
signal.signal(signal.SIGINT, signal.SIG_IGN)
182
# GZ 2010-02-19: Perhaps make this check if breakin is installed instead
183
if signal.getsignal(signal.SIGQUIT) != signal.SIG_DFL:
184
signal.signal(signal.SIGQUIT, signal.SIG_IGN)
187
175
class SocketAsChannelAdapter(object):
224
212
def connect_sftp(self, username, password, host, port):
225
213
"""Make an SSH connection, and return an SFTPClient.
227
215
:param username: an ascii string
228
216
:param password: an ascii string
229
217
:param host: a host name as an ascii string
239
227
def connect_ssh(self, username, password, host, port, command):
240
228
"""Make an SSH connection.
242
230
:returns: something with a `close` method, and a `get_filelike_channels`
243
231
method that returns a pair of (read, write) filelike objects.
403
391
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
405
393
"""Returns the argument list to run the subprocess with.
407
395
Exactly one of 'subsystem' and 'command' must be specified.
409
397
raise NotImplementedError(self._get_vendor_specific_argv)
412
400
class OpenSSHSubprocessVendor(SubprocessVendor):
413
401
"""SSH vendor that uses the 'ssh' executable from OpenSSH."""
415
executable_path = 'ssh'
417
403
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
419
args = [self.executable_path,
405
assert subsystem is not None or command is not None, (
406
'Must specify a command or subsystem')
407
if subsystem is not None:
408
assert command is None, (
409
'subsystem and command are mutually exclusive')
420
411
'-oForwardX11=no', '-oForwardAgent=no',
421
412
'-oClearAllForwardings=yes', '-oProtocol=2',
422
413
'-oNoHostAuthenticationForLocalhost=yes']
436
427
class SSHCorpSubprocessVendor(SubprocessVendor):
437
428
"""SSH vendor that uses the 'ssh' executable from SSH Corporation."""
439
executable_path = 'ssh'
441
430
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
443
args = [self.executable_path, '-x']
432
assert subsystem is not None or command is not None, (
433
'Must specify a command or subsystem')
434
if subsystem is not None:
435
assert command is None, (
436
'subsystem and command are mutually exclusive')
444
438
if port is not None:
445
439
args.extend(['-p', str(port)])
446
440
if username is not None:
451
445
args.extend([host] + command)
454
register_ssh_vendor('sshcorp', SSHCorpSubprocessVendor())
448
register_ssh_vendor('ssh', SSHCorpSubprocessVendor())
457
451
class PLinkSubprocessVendor(SubprocessVendor):
458
452
"""SSH vendor that uses the 'plink' executable from Putty."""
460
executable_path = 'plink'
462
454
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
464
args = [self.executable_path, '-x', '-a', '-ssh', '-2', '-batch']
456
assert subsystem is not None or command is not None, (
457
'Must specify a command or subsystem')
458
if subsystem is not None:
459
assert command is None, (
460
'subsystem and command are mutually exclusive')
461
args = ['plink', '-x', '-a', '-ssh', '-2', '-batch']
465
462
if port is not None:
466
463
args.extend(['-P', str(port)])
467
464
if username is not None:
478
475
def _paramiko_auth(username, password, host, port, paramiko_transport):
476
# paramiko requires a username, but it might be none if nothing was supplied
477
# use the local username, just in case.
478
# We don't override username, because if we aren't using paramiko,
479
# the username might be specified in ~/.ssh/config and we don't want to
480
# force it to something else
481
# Also, it would mess up the self.relpath() functionality
479
482
auth = config.AuthenticationConfig()
480
# paramiko requires a username, but it might be none if nothing was
481
# supplied. If so, use the local username.
482
483
if username is None:
483
username = auth.get_user('ssh', host, port=port,
484
default=getpass.getuser())
484
username = auth.get_user('ssh', host, port=port)
486
# Default to local user
487
username = getpass.getuser()
485
489
if _use_ssh_agent:
486
490
agent = paramiko.Agent()
487
491
for key in agent.get_keys():
499
503
if _try_pkey_auth(paramiko_transport, paramiko.DSSKey, username, 'id_dsa'):
502
# If we have gotten this far, we are about to try for passwords, do an
503
# auth_none check to see if it is even supported.
504
supported_auth_types = []
506
# Note that with paramiko <1.7.5 this logs an INFO message:
507
# Authentication type (none) not permitted.
508
# So we explicitly disable the logging level for this action
509
old_level = paramiko_transport.logger.level
510
paramiko_transport.logger.setLevel(logging.WARNING)
512
paramiko_transport.auth_none(username)
514
paramiko_transport.logger.setLevel(old_level)
515
except paramiko.BadAuthenticationType, e:
516
# Supported methods are in the exception
517
supported_auth_types = e.allowed_types
518
except paramiko.SSHException, e:
519
# Don't know what happened, but just ignore it
521
# We treat 'keyboard-interactive' and 'password' auth methods identically,
522
# because Paramiko's auth_password method will automatically try
523
# 'keyboard-interactive' auth (using the password as the response) if
524
# 'password' auth is not available. Apparently some Debian and Gentoo
525
# OpenSSH servers require this.
526
# XXX: It's possible for a server to require keyboard-interactive auth that
527
# requires something other than a single password, but we currently don't
529
if ('password' not in supported_auth_types and
530
'keyboard-interactive' not in supported_auth_types):
531
raise errors.ConnectionError('Unable to authenticate to SSH host as'
532
'\n %s@%s\nsupported auth types: %s'
533
% (username, host, supported_auth_types))
537
508
paramiko_transport.auth_password(username, password)
542
513
# give up and ask for a password
543
514
password = auth.get_password('ssh', host, username, port=port)
544
# get_password can still return None, which means we should not prompt
545
if password is not None:
547
paramiko_transport.auth_password(username, password)
548
except paramiko.SSHException, e:
549
raise errors.ConnectionError(
550
'Unable to authenticate to SSH host as'
551
'\n %s@%s\n' % (username, host), e)
553
raise errors.ConnectionError('Unable to authenticate to SSH host as'
554
' %s@%s' % (username, host))
516
paramiko_transport.auth_password(username, password)
517
except paramiko.SSHException, e:
518
raise errors.ConnectionError(
519
'Unable to authenticate to SSH host as %s@%s' % (username, host), e)
557
522
def _try_pkey_auth(paramiko_transport, pkey_class, username, filename):
619
584
def os_specific_subprocess_params():
620
585
"""Get O/S specific subprocess parameters."""
621
586
if sys.platform == 'win32':
622
# setting the process group and closing fds is not supported on
587
# setting the process group and closing fds is not supported on
626
# We close fds other than the pipes as the child process does not need
591
# We close fds other than the pipes as the child process does not need
627
592
# them to be open.
629
594
# We also set the child process to ignore SIGINT. Normally the signal
631
596
# this causes it to be seen only by bzr and not by ssh. Python will
632
597
# generate a KeyboardInterrupt in bzr, and we will then have a chance
633
598
# to release locks or do other cleanup over ssh before the connection
635
600
# <https://launchpad.net/products/bzr/+bug/5987>
637
602
# Running it in a separate process group is not good because then it
638
603
# can't get non-echoed input of a password or passphrase.
639
604
# <https://launchpad.net/products/bzr/+bug/40508>
640
return {'preexec_fn': _ignore_signals,
605
return {'preexec_fn': _ignore_sigint,
641
606
'close_fds': True,
645
_subproc_weakrefs = set()
647
def _close_ssh_proc(proc):
648
for func in [proc.stdin.close, proc.stdout.close, proc.wait]:
655
610
class SSHSubprocess(object):
656
611
"""A socket-like object that talks to an ssh subprocess via pipes."""
658
613
def __init__(self, proc):
660
# Add a weakref to proc that will attempt to do the same as self.close
661
# to avoid leaving processes lingering indefinitely.
663
_subproc_weakrefs.remove(ref)
664
_close_ssh_proc(proc)
665
_subproc_weakrefs.add(weakref.ref(self, terminate))
667
616
def send(self, data):
668
617
return os.write(self.proc.stdin.fileno(), data)
671
620
return os.read(self.proc.stdout.fileno(), count)
674
_close_ssh_proc(self.proc)
623
self.proc.stdin.close()
624
self.proc.stdout.close()
676
627
def get_filelike_channels(self):
677
628
return (self.proc.stdout, self.proc.stdin)
added
removed
bzrlib/transport/ssh.py
