55
55
# connect to an agent if we are on win32 and using Paramiko older than 1.6
56
56
_use_ssh_agent = (sys.platform != 'win32' or _paramiko_version >= (1, 6, 0))
59
class SSHVendorManager(object):
60
"""Manager for manage SSH vendors."""
62
# Note, although at first sign the class interface seems similar to
63
# bzrlib.registry.Registry it is not possible/convenient to directly use
64
# the Registry because the class just has "get()" interface instead of the
65
# Registry's "get(key)".
68
self._ssh_vendors = {}
69
self._cached_ssh_vendor = None
70
self._default_ssh_vendor = None
72
def register_default_vendor(self, vendor):
73
"""Register default SSH vendor."""
74
self._default_ssh_vendor = vendor
76
def register_vendor(self, name, vendor):
77
"""Register new SSH vendor by name."""
78
self._ssh_vendors[name] = vendor
80
def clear_cache(self):
81
"""Clear previously cached lookup result."""
82
self._cached_ssh_vendor = None
84
def _get_vendor_by_environment(self, environment=None):
85
"""Return the vendor or None based on BZR_SSH environment variable.
87
:raises UnknownSSH: if the BZR_SSH environment variable contains
90
if environment is None:
91
environment = os.environ
92
if 'BZR_SSH' in environment:
93
vendor_name = environment['BZR_SSH']
95
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
104
def _get_ssh_version_string(self, args):
105
"""Return SSH version string from the subprocess."""
60
def register_ssh_vendor(name, vendor):
61
"""Register SSH vendor."""
62
_ssh_vendors[name] = vendor
66
def _get_ssh_vendor():
67
"""Find out what version of SSH is on the system."""
69
if _ssh_vendor is not None:
72
if 'BZR_SSH' in os.environ:
73
vendor_name = os.environ['BZR_SSH']
107
p = subprocess.Popen(args,
108
stdout=subprocess.PIPE,
109
stderr=subprocess.PIPE,
110
**os_specific_subprocess_params())
111
stdout, stderr = p.communicate()
114
return stdout + stderr
116
def _get_vendor_by_version_string(self, version, progname):
117
"""Return the vendor or None based on output from the subprocess.
119
:param version: The output of 'ssh -V' like command.
120
:param args: Command line that was run.
123
if 'OpenSSH' in version:
124
trace.mutter('ssh implementation is OpenSSH')
125
vendor = OpenSSHSubprocessVendor()
126
elif 'SSH Secure Shell' in version:
127
trace.mutter('ssh implementation is SSH Corp.')
128
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':
133
# Checking if "plink" was the executed argument as Windows
134
# sometimes reports 'ssh -V' incorrectly with 'plink' in it's
135
# version. See https://bugs.launchpad.net/bzr/+bug/107155
136
trace.mutter("ssh implementation is Putty's plink.")
137
vendor = PLinkSubprocessVendor()
140
def _get_vendor_by_inspection(self):
141
"""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])
151
def get_vendor(self, environment=None):
152
"""Find out what version of SSH is on the system.
154
:raises SSHVendorNotFound: if no any SSH vendor is found
155
:raises UnknownSSH: if the BZR_SSH environment variable contains
158
if self._cached_ssh_vendor is None:
159
vendor = self._get_vendor_by_environment(environment)
161
vendor = self._get_vendor_by_inspection()
163
trace.mutter('falling back to default implementation')
164
vendor = self._default_ssh_vendor
166
raise errors.SSHVendorNotFound()
167
self._cached_ssh_vendor = vendor
168
return self._cached_ssh_vendor
170
_ssh_vendor_manager = SSHVendorManager()
171
_get_ssh_vendor = _ssh_vendor_manager.get_vendor
172
register_default_ssh_vendor = _ssh_vendor_manager.register_default_vendor
173
register_ssh_vendor = _ssh_vendor_manager.register_vendor
176
def _ignore_signals():
75
_ssh_vendor = _ssh_vendors[vendor_name]
77
raise UnknownSSH(vendor_name)
81
p = subprocess.Popen(['ssh', '-V'],
82
stdin=subprocess.PIPE,
83
stdout=subprocess.PIPE,
84
stderr=subprocess.PIPE,
85
**os_specific_subprocess_params())
86
returncode = p.returncode
87
stdout, stderr = p.communicate()
91
if 'OpenSSH' in stderr:
92
mutter('ssh implementation is OpenSSH')
93
_ssh_vendor = OpenSSHSubprocessVendor()
94
elif 'SSH Secure Shell' in stderr:
95
mutter('ssh implementation is SSH Corp.')
96
_ssh_vendor = SSHCorpSubprocessVendor()
98
if _ssh_vendor is not None:
101
# XXX: 20051123 jamesh
102
# A check for putty's plink or lsh would go here.
104
mutter('falling back to paramiko implementation')
105
_ssh_vendor = ParamikoVendor()
110
def _ignore_sigint():
177
111
# TODO: This should possibly ignore SIGHUP as well, but bzr currently
178
112
# doesn't handle it itself.
179
113
# <https://launchpad.net/products/bzr/+bug/41433/+index>
181
115
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
class SocketAsChannelAdapter(object):
119
class LoopbackSFTP(object):
188
120
"""Simple wrapper for a socket that pretends to be a paramiko Channel."""
190
122
def __init__(self, sock):
191
123
self.__socket = sock
194
return "bzr SocketAsChannelAdapter"
196
125
def send(self, data):
197
126
return self.__socket.send(data)
199
128
def recv(self, n):
201
return self.__socket.recv(n)
202
except socket.error, e:
203
if e.args[0] in (errno.EPIPE, errno.ECONNRESET, errno.ECONNABORTED,
205
# Connection has closed. Paramiko expects an empty string in
206
# this case, not an exception.
129
return self.__socket.recv(n)
210
131
def recv_ready(self):
211
# TODO: jam 20051215 this function is necessary to support the
212
# pipelined() function. In reality, it probably should use
213
# poll() or select() to actually return if there is data
214
# available, otherwise we probably don't get any benefit
237
154
raise NotImplementedError(self.connect_sftp)
239
156
def connect_ssh(self, username, password, host, port, command):
240
"""Make an SSH connection.
242
:returns: something with a `close` method, and a `get_filelike_channels`
243
method that returns a pair of (read, write) filelike objects.
157
"""Make an SSH connection, and return a pipe-like object.
159
(This is currently unused, it's just here to indicate future directions
245
162
raise NotImplementedError(self.connect_ssh)
247
def _raise_connection_error(self, host, port=None, orig_error=None,
248
msg='Unable to connect to SSH host'):
249
"""Raise a SocketConnectionError with properly formatted host.
251
This just unifies all the locations that try to raise ConnectionError,
252
so that they format things properly.
254
raise errors.SocketConnectionError(host=host, port=port, msg=msg,
255
orig_error=orig_error)
258
165
class LoopbackVendor(SSHVendor):
259
166
"""SSH "vendor" that connects over a plain TCP socket, not SSH."""
261
168
def connect_sftp(self, username, password, host, port):
262
169
sock = socket.socket()
264
171
sock.connect((host, port))
265
172
except socket.error, e:
266
self._raise_connection_error(host, port=port, orig_error=e)
267
return SFTPClient(SocketAsChannelAdapter(sock))
173
raise ConnectionError('Unable to connect to SSH host %s:%s: %s'
175
return SFTPClient(LoopbackSFTP(sock))
269
177
register_ssh_vendor('loopback', LoopbackVendor())
272
class _ParamikoSSHConnection(object):
273
def __init__(self, channel):
274
self.channel = channel
276
def get_filelike_channels(self):
277
return self.channel.makefile('rb'), self.channel.makefile('wb')
280
return self.channel.close()
283
180
class ParamikoVendor(SSHVendor):
284
181
"""Vendor that uses paramiko."""
286
def _connect(self, username, password, host, port):
183
def connect_sftp(self, username, password, host, port):
287
184
global SYSTEM_HOSTKEYS, BZR_HOSTKEYS
293
190
t.set_log_channel('bzr.paramiko')
295
192
except (paramiko.SSHException, socket.error), e:
296
self._raise_connection_error(host, port=port, orig_error=e)
193
raise ConnectionError('Unable to reach SSH host %s:%s: %s'
298
196
server_key = t.get_remote_server_key()
299
197
server_key_hex = paramiko.util.hexify(server_key.get_fingerprint())
300
198
keytype = server_key.get_name()
301
199
if host in SYSTEM_HOSTKEYS and keytype in SYSTEM_HOSTKEYS[host]:
302
200
our_server_key = SYSTEM_HOSTKEYS[host][keytype]
303
our_server_key_hex = paramiko.util.hexify(
304
our_server_key.get_fingerprint())
201
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
305
202
elif host in BZR_HOSTKEYS and keytype in BZR_HOSTKEYS[host]:
306
203
our_server_key = BZR_HOSTKEYS[host][keytype]
307
our_server_key_hex = paramiko.util.hexify(
308
our_server_key.get_fingerprint())
204
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
310
trace.warning('Adding %s host key for %s: %s'
311
% (keytype, host, server_key_hex))
312
add = getattr(BZR_HOSTKEYS, 'add', None)
313
if add is not None: # paramiko >= 1.X.X
314
BZR_HOSTKEYS.add(host, keytype, server_key)
316
BZR_HOSTKEYS.setdefault(host, {})[keytype] = server_key
206
warning('Adding %s host key for %s: %s' % (keytype, host, server_key_hex))
207
if host not in BZR_HOSTKEYS:
208
BZR_HOSTKEYS[host] = {}
209
BZR_HOSTKEYS[host][keytype] = server_key
317
210
our_server_key = server_key
318
our_server_key_hex = paramiko.util.hexify(
319
our_server_key.get_fingerprint())
211
our_server_key_hex = paramiko.util.hexify(our_server_key.get_fingerprint())
321
213
if server_key != our_server_key:
322
214
filename1 = os.path.expanduser('~/.ssh/known_hosts')
323
filename2 = osutils.pathjoin(config.config_dir(), 'ssh_host_keys')
324
raise errors.TransportError(
325
'Host keys for %s do not match! %s != %s' %
215
filename2 = pathjoin(config_dir(), 'ssh_host_keys')
216
raise TransportError('Host keys for %s do not match! %s != %s' % \
326
217
(host, our_server_key_hex, server_key_hex),
327
218
['Try editing %s or %s' % (filename1, filename2)])
329
_paramiko_auth(username, password, host, port, t)
332
def connect_sftp(self, username, password, host, port):
333
t = self._connect(username, password, host, port)
335
return t.open_sftp_client()
336
except paramiko.SSHException, e:
337
self._raise_connection_error(host, port=port, orig_error=e,
338
msg='Unable to start sftp client')
340
def connect_ssh(self, username, password, host, port, command):
341
t = self._connect(username, password, host, port)
343
channel = t.open_session()
344
cmdline = ' '.join(command)
345
channel.exec_command(cmdline)
346
return _ParamikoSSHConnection(channel)
347
except paramiko.SSHException, e:
348
self._raise_connection_error(host, port=port, orig_error=e,
349
msg='Unable to invoke remote bzr')
351
if paramiko is not None:
352
vendor = ParamikoVendor()
353
register_ssh_vendor('paramiko', vendor)
354
register_ssh_vendor('none', vendor)
355
register_default_ssh_vendor(vendor)
356
_sftp_connection_errors = (EOFError, paramiko.SSHException)
359
_sftp_connection_errors = (EOFError,)
220
_paramiko_auth(username, password, host, t)
223
sftp = t.open_sftp_client()
224
except paramiko.SSHException, e:
225
raise ConnectionError('Unable to start sftp client %s:%d' %
229
register_ssh_vendor('paramiko', ParamikoVendor())
362
232
class SubprocessVendor(SSHVendor):
363
233
"""Abstract base class for vendors that use pipes to a subprocess."""
365
def _connect(self, argv):
366
proc = subprocess.Popen(argv,
367
stdin=subprocess.PIPE,
368
stdout=subprocess.PIPE,
369
**os_specific_subprocess_params())
370
return SSHSubprocess(proc)
372
235
def connect_sftp(self, username, password, host, port):
374
237
argv = self._get_vendor_specific_argv(username, host, port,
375
238
subsystem='sftp')
376
sock = self._connect(argv)
377
return SFTPClient(SocketAsChannelAdapter(sock))
378
except _sftp_connection_errors, e:
379
self._raise_connection_error(host, port=port, orig_error=e)
380
except (OSError, IOError), e:
381
# If the machine is fast enough, ssh can actually exit
382
# before we try and send it the sftp request, which
383
# raises a Broken Pipe
384
if e.errno not in (errno.EPIPE,):
386
self._raise_connection_error(host, port=port, orig_error=e)
388
def connect_ssh(self, username, password, host, port, command):
390
argv = self._get_vendor_specific_argv(username, host, port,
392
return self._connect(argv)
393
except (EOFError), e:
394
self._raise_connection_error(host, port=port, orig_error=e)
395
except (OSError, IOError), e:
396
# If the machine is fast enough, ssh can actually exit
397
# before we try and send it the sftp request, which
398
# raises a Broken Pipe
399
if e.errno not in (errno.EPIPE,):
401
self._raise_connection_error(host, port=port, orig_error=e)
239
proc = subprocess.Popen(argv,
240
stdin=subprocess.PIPE,
241
stdout=subprocess.PIPE,
242
**os_specific_subprocess_params())
243
sock = SSHSubprocess(proc)
244
return SFTPClient(sock)
245
except (EOFError, paramiko.SSHException), e:
246
raise ConnectionError('Unable to connect to SSH host %s:%s: %s'
248
except (OSError, IOError), e:
249
# If the machine is fast enough, ssh can actually exit
250
# before we try and send it the sftp request, which
251
# raises a Broken Pipe
252
if e.errno not in (errno.EPIPE,):
254
raise ConnectionError('Unable to connect to SSH host %s:%s: %s'
403
257
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
405
259
"""Returns the argument list to run the subprocess with.
407
261
Exactly one of 'subsystem' and 'command' must be specified.
409
263
raise NotImplementedError(self._get_vendor_specific_argv)
265
register_ssh_vendor('none', ParamikoVendor())
412
268
class OpenSSHSubprocessVendor(SubprocessVendor):
413
269
"""SSH vendor that uses the 'ssh' executable from OpenSSH."""
415
executable_path = 'ssh'
417
271
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
419
args = [self.executable_path,
273
assert subsystem is not None or command is not None, (
274
'Must specify a command or subsystem')
275
if subsystem is not None:
276
assert command is None, (
277
'subsystem and command are mutually exclusive')
420
279
'-oForwardX11=no', '-oForwardAgent=no',
421
280
'-oClearAllForwardings=yes', '-oProtocol=2',
422
281
'-oNoHostAuthenticationForLocalhost=yes']
451
313
args.extend([host] + command)
454
register_ssh_vendor('sshcorp', SSHCorpSubprocessVendor())
457
class PLinkSubprocessVendor(SubprocessVendor):
458
"""SSH vendor that uses the 'plink' executable from Putty."""
460
executable_path = 'plink'
462
def _get_vendor_specific_argv(self, username, host, port, subsystem=None,
464
args = [self.executable_path, '-x', '-a', '-ssh', '-2', '-batch']
466
args.extend(['-P', str(port)])
467
if username is not None:
468
args.extend(['-l', username])
469
if subsystem is not None:
470
args.extend(['-s', host, subsystem])
472
args.extend([host] + command)
475
register_ssh_vendor('plink', PLinkSubprocessVendor())
478
def _paramiko_auth(username, password, host, port, paramiko_transport):
479
auth = config.AuthenticationConfig()
480
# paramiko requires a username, but it might be none if nothing was
481
# supplied. If so, use the local username.
483
username = auth.get_user('ssh', host, port=port,
484
default=getpass.getuser())
316
register_ssh_vendor('ssh', SSHCorpSubprocessVendor())
319
def _paramiko_auth(username, password, host, paramiko_transport):
320
# paramiko requires a username, but it might be none if nothing was supplied
321
# use the local username, just in case.
322
# We don't override username, because if we aren't using paramiko,
323
# the username might be specified in ~/.ssh/config and we don't want to
324
# force it to something else
325
# Also, it would mess up the self.relpath() functionality
326
username = username or getpass.getuser()
485
328
if _use_ssh_agent:
486
329
agent = paramiko.Agent()
487
330
for key in agent.get_keys():
488
trace.mutter('Trying SSH agent key %s'
489
% paramiko.util.hexify(key.get_fingerprint()))
331
mutter('Trying SSH agent key %s' % paramiko.util.hexify(key.get_fingerprint()))
491
333
paramiko_transport.auth_publickey(username, key)
493
335
except paramiko.SSHException, e:
496
338
# okay, try finding id_rsa or id_dss? (posix only)
497
339
if _try_pkey_auth(paramiko_transport, paramiko.RSAKey, username, 'id_rsa'):
499
341
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
346
paramiko_transport.auth_password(username, password)
631
434
# this causes it to be seen only by bzr and not by ssh. Python will
632
435
# generate a KeyboardInterrupt in bzr, and we will then have a chance
633
436
# to release locks or do other cleanup over ssh before the connection
635
438
# <https://launchpad.net/products/bzr/+bug/5987>
637
440
# Running it in a separate process group is not good because then it
638
441
# can't get non-echoed input of a password or passphrase.
639
442
# <https://launchpad.net/products/bzr/+bug/40508>
640
return {'preexec_fn': _ignore_signals,
443
return {'preexec_fn': _ignore_sigint,
641
444
'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
448
class SSHSubprocess(object):
656
449
"""A socket-like object that talks to an ssh subprocess via pipes."""
658
451
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
454
def send(self, data):
668
455
return os.write(self.proc.stdin.fileno(), data)
457
def recv_ready(self):
458
# TODO: jam 20051215 this function is necessary to support the
459
# pipelined() function. In reality, it probably should use
460
# poll() or select() to actually return if there is data
461
# available, otherwise we probably don't get any benefit
670
464
def recv(self, count):
671
465
return os.read(self.proc.stdout.fileno(), count)
674
_close_ssh_proc(self.proc)
468
self.proc.stdin.close()
469
self.proc.stdout.close()
676
def get_filelike_channels(self):
677
return (self.proc.stdout, self.proc.stdin)
added
removed
bzrlib/transport/ssh.py
