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125 lines
4.6 KiB
Python
125 lines
4.6 KiB
Python
# Copyright 2017, David Wilson
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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Functionality to allow establishing new slave contexts over an SSH connection.
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"""
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import commands
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import logging
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import time
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import mitogen.parent
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LOG = logging.getLogger('mitogen')
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PASSWORD_PROMPT = 'password'
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PERMDENIED_PROMPT = 'permission denied'
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class PasswordError(mitogen.core.Error):
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pass
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class Stream(mitogen.parent.Stream):
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create_child = staticmethod(mitogen.parent.tty_create_child)
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python_path = 'python2.7'
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#: The path to the SSH binary.
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ssh_path = 'ssh'
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identity_file = None
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password = None
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port = None
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def construct(self, hostname, username=None, ssh_path=None, port=None,
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check_host_keys=True, password=None, identity_file=None,
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**kwargs):
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super(Stream, self).construct(**kwargs)
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self.hostname = hostname
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self.username = username
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self.port = port
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self.check_host_keys = check_host_keys
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self.password = password
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self.identity_file = identity_file
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if ssh_path:
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self.ssh_path = ssh_path
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def get_boot_command(self):
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bits = [self.ssh_path]
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#bits += ['-o', 'BatchMode yes']
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if self.username:
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bits += ['-l', self.username]
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if self.port is not None:
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bits += ['-p', str(self.port)]
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if self.identity_file or self.password:
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bits += ['-o', 'IdentitiesOnly yes']
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if self.identity_file:
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bits += ['-i', self.identity_file]
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if not self.check_host_keys:
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bits += [
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'-o', 'StrictHostKeyChecking no',
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'-o', 'UserKnownHostsFile /dev/null',
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]
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bits.append(self.hostname)
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base = super(Stream, self).get_boot_command()
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return bits + [commands.mkarg(s).strip() for s in base]
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def connect(self):
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super(Stream, self).connect()
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self.name = 'ssh.' + self.hostname
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if self.port:
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self.name += ':%s' % (self.port,)
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auth_incorrect_msg = 'SSH authentication is incorrect'
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password_incorrect_msg = 'SSH password is incorrect'
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password_required_msg = 'SSH password was requested, but none specified'
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def _connect_bootstrap(self):
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password_sent = False
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for buf in mitogen.parent.iter_read(self.receive_side.fd,
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time.time() + 10.0):
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LOG.debug('%r: received %r', self, buf)
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if buf.endswith('EC0\n'):
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self._ec0_received()
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return
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elif PERMDENIED_PROMPT in buf.lower():
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if self.password is not None and password_sent:
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raise PasswordError(self.password_incorrect_msg)
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else:
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raise PasswordError(self.auth_incorrect_msg)
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elif PASSWORD_PROMPT in buf.lower():
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if self.password is None:
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raise PasswordError(self.password_required_msg)
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LOG.debug('sending password')
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self.transmit_side.write(self.password + '\n')
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password_sent = True
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else:
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raise mitogen.core.StreamError('bootstrap failed')
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