121
128
elif 'SSH Secure Shell' in version:
122
129
trace.mutter('ssh implementation is SSH Corp.')
123
130
vendor = SSHCorpSubprocessVendor()
124
elif 'plink' in version and args[0] == 'plink':
131
elif 'lsh' in version:
132
trace.mutter('ssh implementation is GNU lsh.')
133
vendor = LSHSubprocessVendor()
134
# As plink user prompts are not handled currently, don't auto-detect
135
# it by inspection below, but keep this vendor detection for if a path
136
# is given in BZR_SSH. See https://bugs.launchpad.net/bugs/414743
137
elif 'plink' in version and progname == 'plink':
125
138
# Checking if "plink" was the executed argument as Windows
126
# sometimes reports 'ssh -V' incorrectly with 'plink' in it's
139
# sometimes reports 'ssh -V' incorrectly with 'plink' in its
127
140
# version. See https://bugs.launchpad.net/bzr/+bug/107155
128
141
trace.mutter("ssh implementation is Putty's plink.")
129
142
vendor = PLinkSubprocessVendor()
132
145
def _get_vendor_by_inspection(self):
133
146
"""Return the vendor or None by checking for known SSH implementations."""
134
for args in (['ssh', '-V'], ['plink', '-V']):
135
version = self._get_ssh_version_string(args)
136
vendor = self._get_vendor_by_version_string(version, args)
137
if vendor is not None:
147
version = self._get_ssh_version_string(['ssh', '-V'])
148
return self._get_vendor_by_version_string(version, "ssh")
150
def _get_vendor_from_path(self, path):
151
"""Return the vendor or None using the program at the given path"""
152
version = self._get_ssh_version_string([path, '-V'])
153
return self._get_vendor_by_version_string(version,
154
os.path.splitext(os.path.basename(path))[0])
141
156
def get_vendor(self, environment=None):
142
157
"""Find out what version of SSH is on the system.
335
341
self._raise_connection_error(host, port=port, orig_error=e,
336
342
msg='Unable to invoke remote bzr')
344
_ssh_connection_errors = (EOFError, OSError, IOError, socket.error)
338
345
if paramiko is not None:
339
346
vendor = ParamikoVendor()
340
347
register_ssh_vendor('paramiko', vendor)
341
348
register_ssh_vendor('none', vendor)
342
349
register_default_ssh_vendor(vendor)
343
_sftp_connection_errors = (EOFError, paramiko.SSHException)
350
_ssh_connection_errors += (paramiko.SSHException,)
346
_sftp_connection_errors = (EOFError,)
349
354
class SubprocessVendor(SSHVendor):
350
355
"""Abstract base class for vendors that use pipes to a subprocess."""
357
# In general stderr should be inherited from the parent process so prompts
358
# are visible on the terminal. This can be overriden to another file for
359
# tests, but beware of using PIPE which may hang due to not being read.
360
_stderr_target = None
352
362
def _connect(self, argv):
353
proc = subprocess.Popen(argv,
354
stdin=subprocess.PIPE,
355
stdout=subprocess.PIPE,
363
# Attempt to make a socketpair to use as stdin/stdout for the SSH
364
# subprocess. We prefer sockets to pipes because they support
365
# non-blocking short reads, allowing us to optimistically read 64k (or
368
my_sock, subproc_sock = socket.socketpair()
369
osutils.set_fd_cloexec(my_sock)
370
except (AttributeError, socket.error):
371
# This platform doesn't support socketpair(), so just use ordinary
373
stdin = stdout = subprocess.PIPE
374
my_sock, subproc_sock = None, None
376
stdin = stdout = subproc_sock
377
proc = subprocess.Popen(argv, stdin=stdin, stdout=stdout,
378
stderr=self._stderr_target,
356
379
**os_specific_subprocess_params())
357
return SSHSubprocess(proc)
380
if subproc_sock is not None:
382
return SSHSubprocessConnection(proc, sock=my_sock)
359
384
def connect_sftp(self, username, password, host, port):
362
387
subsystem='sftp')
363
388
sock = self._connect(argv)
364
389
return SFTPClient(SocketAsChannelAdapter(sock))
365
except _sftp_connection_errors, e:
366
self._raise_connection_error(host, port=port, orig_error=e)
367
except (OSError, IOError), e:
368
# If the machine is fast enough, ssh can actually exit
369
# before we try and send it the sftp request, which
370
# raises a Broken Pipe
371
if e.errno not in (errno.EPIPE,):
390
except _ssh_connection_errors, e:
373
391
self._raise_connection_error(host, port=port, orig_error=e)
375
393
def connect_ssh(self, username, password, host, port, command):
377
395
argv = self._get_vendor_specific_argv(username, host, port,
379
397
return self._connect(argv)
380
except (EOFError), e:
381
self._raise_connection_error(host, port=port, orig_error=e)
382
except (OSError, IOError), e:
383
# If the machine is fast enough, ssh can actually exit
384
# before we try and send it the sftp request, which
385
# raises a Broken Pipe
386
if e.errno not in (errno.EPIPE,):
398
except _ssh_connection_errors, e:
388
399
self._raise_connection_error(host, port=port, orig_error=e)
390
401
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
399
410
class OpenSSHSubprocessVendor(SubprocessVendor):
400
411
"""SSH vendor that uses the 'ssh' executable from OpenSSH."""
413
executable_path = 'ssh'
402
415
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
417
args = [self.executable_path,
405
418
'-oForwardX11=no', '-oForwardAgent=no',
406
'-oClearAllForwardings=yes', '-oProtocol=2',
419
'-oClearAllForwardings=yes',
407
420
'-oNoHostAuthenticationForLocalhost=yes']
408
421
if port is not None:
409
422
args.extend(['-p', str(port)])
434
449
args.extend([host] + command)
437
register_ssh_vendor('ssh', SSHCorpSubprocessVendor())
452
register_ssh_vendor('sshcorp', SSHCorpSubprocessVendor())
455
class LSHSubprocessVendor(SubprocessVendor):
456
"""SSH vendor that uses the 'lsh' executable from GNU"""
458
executable_path = 'lsh'
460
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
462
args = [self.executable_path]
464
args.extend(['-p', str(port)])
465
if username is not None:
466
args.extend(['-l', username])
467
if subsystem is not None:
468
args.extend(['--subsystem', subsystem, host])
470
args.extend([host] + command)
473
register_ssh_vendor('lsh', LSHSubprocessVendor())
440
476
class PLinkSubprocessVendor(SubprocessVendor):
441
477
"""SSH vendor that uses the 'plink' executable from Putty."""
479
executable_path = 'plink'
443
481
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
445
args = ['plink', '-x', '-a', '-ssh', '-2', '-batch']
483
args = [self.executable_path, '-x', '-a', '-ssh', '-2', '-batch']
446
484
if port is not None:
447
485
args.extend(['-P', str(port)])
448
486
if username is not None:
480
518
if _try_pkey_auth(paramiko_transport, paramiko.DSSKey, username, 'id_dsa'):
521
# If we have gotten this far, we are about to try for passwords, do an
522
# auth_none check to see if it is even supported.
523
supported_auth_types = []
525
# Note that with paramiko <1.7.5 this logs an INFO message:
526
# Authentication type (none) not permitted.
527
# So we explicitly disable the logging level for this action
528
old_level = paramiko_transport.logger.level
529
paramiko_transport.logger.setLevel(logging.WARNING)
531
paramiko_transport.auth_none(username)
533
paramiko_transport.logger.setLevel(old_level)
534
except paramiko.BadAuthenticationType, e:
535
# Supported methods are in the exception
536
supported_auth_types = e.allowed_types
537
except paramiko.SSHException, e:
538
# Don't know what happened, but just ignore it
540
# We treat 'keyboard-interactive' and 'password' auth methods identically,
541
# because Paramiko's auth_password method will automatically try
542
# 'keyboard-interactive' auth (using the password as the response) if
543
# 'password' auth is not available. Apparently some Debian and Gentoo
544
# OpenSSH servers require this.
545
# XXX: It's possible for a server to require keyboard-interactive auth that
546
# requires something other than a single password, but we currently don't
548
if ('password' not in supported_auth_types and
549
'keyboard-interactive' not in supported_auth_types):
550
raise errors.ConnectionError('Unable to authenticate to SSH host as'
551
'\n %s@%s\nsupported auth types: %s'
552
% (username, host, supported_auth_types))
485
556
paramiko_transport.auth_password(username, password)
490
561
# give up and ask for a password
491
562
password = auth.get_password('ssh', host, username, port=port)
493
paramiko_transport.auth_password(username, password)
494
except paramiko.SSHException, e:
495
raise errors.ConnectionError(
496
'Unable to authenticate to SSH host as %s@%s' % (username, host), e)
563
# get_password can still return None, which means we should not prompt
564
if password is not None:
566
paramiko_transport.auth_password(username, password)
567
except paramiko.SSHException, e:
568
raise errors.ConnectionError(
569
'Unable to authenticate to SSH host as'
570
'\n %s@%s\n' % (username, host), e)
572
raise errors.ConnectionError('Unable to authenticate to SSH host as'
573
' %s@%s' % (username, host))
499
576
def _try_pkey_auth(paramiko_transport, pkey_class, username, filename):
579
657
# Running it in a separate process group is not good because then it
580
658
# can't get non-echoed input of a password or passphrase.
581
659
# <https://launchpad.net/products/bzr/+bug/40508>
582
return {'preexec_fn': _ignore_sigint,
660
return {'preexec_fn': _ignore_signals,
583
661
'close_fds': True,
587
class SSHSubprocess(object):
588
"""A socket-like object that talks to an ssh subprocess via pipes."""
590
def __init__(self, proc):
665
_subproc_weakrefs = set()
667
def _close_ssh_proc(proc, sock):
668
"""Carefully close stdin/stdout and reap the SSH process.
670
If the pipes are already closed and/or the process has already been
671
wait()ed on, that's ok, and no error is raised. The goal is to do our best
672
to clean up (whether or not a clean up was already tried).
675
for closeable in (proc.stdin, proc.stdout, sock):
676
# We expect that either proc (a subprocess.Popen) will have stdin and
677
# stdout streams to close, or that we will have been passed a socket to
678
# close, with the option not in use being None.
679
if closeable is not None:
680
funcs.append(closeable.close)
681
funcs.append(proc.wait)
686
# It's ok for the pipe to already be closed, or the process to
687
# already be finished.
691
class SSHConnection(object):
692
"""Abstract base class for SSH connections."""
694
def get_sock_or_pipes(self):
695
"""Returns a (kind, io_object) pair.
697
If kind == 'socket', then io_object is a socket.
699
If kind == 'pipes', then io_object is a pair of file-like objects
700
(read_from, write_to).
702
raise NotImplementedError(self.get_sock_or_pipes)
705
raise NotImplementedError(self.close)
708
class SSHSubprocessConnection(SSHConnection):
709
"""A connection to an ssh subprocess via pipes or a socket.
711
This class is also socket-like enough to be used with
712
SocketAsChannelAdapter (it has 'send' and 'recv' methods).
715
def __init__(self, proc, sock=None):
718
:param proc: a subprocess.Popen
719
:param sock: if proc.stdin/out is a socket from a socketpair, then sock
720
should bzrlib's half of that socketpair. If not passed, proc's
721
stdin/out is assumed to be ordinary pipes.
725
# Add a weakref to proc that will attempt to do the same as self.close
726
# to avoid leaving processes lingering indefinitely.
728
_subproc_weakrefs.remove(ref)
729
_close_ssh_proc(proc, sock)
730
_subproc_weakrefs.add(weakref.ref(self, terminate))
593
732
def send(self, data):
594
return os.write(self.proc.stdin.fileno(), data)
733
if self._sock is not None:
734
return self._sock.send(data)
736
return os.write(self.proc.stdin.fileno(), data)
596
738
def recv(self, count):
597
return os.read(self.proc.stdout.fileno(), count)
600
self.proc.stdin.close()
601
self.proc.stdout.close()
604
def get_filelike_channels(self):
605
return (self.proc.stdout, self.proc.stdin)
739
if self._sock is not None:
740
return self._sock.recv(count)
742
return os.read(self.proc.stdout.fileno(), count)
745
_close_ssh_proc(self.proc, self._sock)
747
def get_sock_or_pipes(self):
748
if self._sock is not None:
749
return 'socket', self._sock
751
return 'pipes', (self.proc.stdout, self.proc.stdin)
754
class _ParamikoSSHConnection(SSHConnection):
755
"""An SSH connection via paramiko."""
757
def __init__(self, channel):
758
self.channel = channel
760
def get_sock_or_pipes(self):
761
return ('socket', self.channel)
764
return self.channel.close()
added
removed
bzrlib/transport/ssh.py
