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308 lines
11 KiB
Python
308 lines
11 KiB
Python
# Copyright 2019, 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,
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# this 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"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# !mitogen: minify_safe
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"""
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Construct new children via the OpenSSH client.
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"""
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import logging
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import re
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try:
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from shlex import quote as shlex_quote
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except ImportError:
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from pipes import quote as shlex_quote
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import mitogen.parent
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from mitogen.core import b
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try:
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any
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except NameError:
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from mitogen.core import any
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LOG = logging.getLogger(__name__)
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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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hostkey_config_msg = (
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'SSH requested permission to accept unknown host key, but '
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'check_host_keys=ignore. This is likely due to ssh_args= '
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'conflicting with check_host_keys=. Please correct your '
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'configuration.'
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)
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hostkey_failed_msg = (
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'Host key checking is enabled, and SSH reported an unrecognized or '
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'mismatching host key.'
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)
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# sshpass uses 'assword' because it doesn't lowercase the input.
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PASSWORD_PROMPT_PATTERN = re.compile(
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b('password'),
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re.I
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)
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HOSTKEY_REQ_PATTERN = re.compile(
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b(r'are you sure you want to continue connecting \(yes/no\)\?'),
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re.I
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)
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HOSTKEY_FAIL_PATTERN = re.compile(
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b(r'host key verification failed\.'),
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re.I
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)
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# [user@host: ] permission denied
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# issue #271: work around conflict with user shell reporting 'permission
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# denied' e.g. during chdir($HOME) by only matching it at the start of the
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# line.
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PERMDENIED_PATTERN = re.compile(
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b('^(?:[^@]+@[^:]+: )?' # Absent in OpenSSH <7.5
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'Permission denied'),
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re.I
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)
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DEBUG_PATTERN = re.compile(b('^debug[123]:'))
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class PasswordError(mitogen.core.StreamError):
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pass
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class HostKeyError(mitogen.core.StreamError):
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pass
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class SetupProtocol(mitogen.parent.RegexProtocol):
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"""
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This protocol is attached to stderr of the SSH client. It responds to
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various interactive prompts as required.
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"""
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password_sent = False
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def _on_host_key_request(self, line, match):
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if self.stream.conn.options.check_host_keys == 'accept':
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LOG.debug('%s: accepting host key', self.stream.name)
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self.stream.transmit_side.write(b('yes\n'))
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return
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# _host_key_prompt() should never be reached with ignore or enforce
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# mode, SSH should have handled that. User's ssh_args= is conflicting
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# with ours.
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self.stream.conn._fail_connection(HostKeyError(hostkey_config_msg))
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def _on_host_key_failed(self, line, match):
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self.stream.conn._fail_connection(HostKeyError(hostkey_failed_msg))
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def _on_permission_denied(self, line, match):
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if self.stream.conn.options.password is not None and \
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self.password_sent:
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self.stream.conn._fail_connection(
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PasswordError(password_incorrect_msg)
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)
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elif PASSWORD_PROMPT_PATTERN.search(line) and \
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self.stream.conn.options.password is None:
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# Permission denied (password,pubkey)
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self.stream.conn._fail_connection(
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PasswordError(password_required_msg)
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)
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else:
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self.stream.conn._fail_connection(
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PasswordError(auth_incorrect_msg)
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)
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def _on_password_prompt(self, line, match):
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LOG.debug('%s: (password prompt): %s', self.stream.name, line)
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if self.stream.conn.options.password is None:
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self.stream.conn._fail(PasswordError(password_required_msg))
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self.stream.transmit_side.write(
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(self.stream.conn.options.password + '\n').encode('utf-8')
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)
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self.password_sent = True
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def _on_debug_line(self, line, match):
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text = mitogen.core.to_text(line.rstrip())
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LOG.debug('%s: %s', self.stream.name, text)
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PATTERNS = [
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(DEBUG_PATTERN, _on_debug_line),
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(HOSTKEY_FAIL_PATTERN, _on_host_key_failed),
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(PERMDENIED_PATTERN, _on_permission_denied),
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]
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PARTIAL_PATTERNS = [
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(PASSWORD_PROMPT_PATTERN, _on_password_prompt),
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(HOSTKEY_REQ_PATTERN, _on_host_key_request),
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]
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class Options(mitogen.parent.Options):
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#: Default to whatever is available as 'python' on the remote machine,
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#: overriding sys.executable use.
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python_path = 'python'
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#: Number of -v invocations to pass on command line.
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ssh_debug_level = 0
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#: The path to the SSH binary.
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ssh_path = 'ssh'
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hostname = None
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username = None
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port = None
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identity_file = None
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password = None
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ssh_args = None
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check_host_keys_msg = 'check_host_keys= must be set to accept, enforce or ignore'
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def __init__(self, hostname, username=None, ssh_path=None, port=None,
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check_host_keys='enforce', password=None, identity_file=None,
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compression=True, ssh_args=None, keepalive_enabled=True,
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keepalive_count=3, keepalive_interval=15,
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identities_only=True, ssh_debug_level=None, **kwargs):
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super(Options, self).__init__(**kwargs)
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if check_host_keys not in ('accept', 'enforce', 'ignore'):
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raise ValueError(self.check_host_keys_msg)
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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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self.identities_only = identities_only
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self.compression = compression
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self.keepalive_enabled = keepalive_enabled
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self.keepalive_count = keepalive_count
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self.keepalive_interval = keepalive_interval
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if ssh_path:
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self.ssh_path = ssh_path
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if ssh_args:
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self.ssh_args = ssh_args
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if ssh_debug_level:
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self.ssh_debug_level = ssh_debug_level
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class Connection(mitogen.parent.Connection):
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options_class = Options
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diag_protocol_class = SetupProtocol
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child_is_immediate_subprocess = False
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# strings that, if escaped, cause problems creating connections
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# example: `source /opt/rh/rh-python36/enable && python`
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# is an acceptable ansible_python_version but shlex would quote the &&
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# and prevent python from executing
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SHLEX_IGNORE = [
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"&&"
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]
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def _get_name(self):
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s = u'ssh.' + mitogen.core.to_text(self.options.hostname)
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if self.options.port and self.options.port != 22:
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s += u':%s' % (self.options.port,)
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return s
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def _requires_pty(self):
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"""
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Return :data:`True` if a PTY to is required for this configuration,
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because it must interactively accept host keys or type a password.
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"""
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return (
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self.options.check_host_keys == 'accept' or
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self.options.password is not None
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)
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def create_child(self, **kwargs):
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"""
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Avoid PTY use when possible to avoid a scaling limitation.
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"""
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if self._requires_pty():
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return mitogen.parent.hybrid_tty_create_child(**kwargs)
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else:
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return mitogen.parent.create_child(stderr_pipe=True, **kwargs)
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def get_boot_command(self):
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bits = [self.options.ssh_path]
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if self.options.ssh_debug_level:
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bits += ['-' + ('v' * min(3, self.options.ssh_debug_level))]
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else:
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# issue #307: suppress any login banner, as it may contain the
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# password prompt, and there is no robust way to tell the
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# difference.
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bits += ['-o', 'LogLevel ERROR']
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if self.options.username:
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bits += ['-l', self.options.username]
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if self.options.port is not None:
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bits += ['-p', str(self.options.port)]
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if self.options.identities_only and (self.options.identity_file or
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self.options.password):
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bits += ['-o', 'IdentitiesOnly yes']
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if self.options.identity_file:
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bits += ['-i', self.options.identity_file]
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if self.options.compression:
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bits += ['-o', 'Compression yes']
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if self.options.keepalive_enabled:
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bits += [
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'-o', 'ServerAliveInterval %s' % (
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self.options.keepalive_interval,
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),
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'-o', 'ServerAliveCountMax %s' % (
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self.options.keepalive_count,
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),
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]
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if not self._requires_pty():
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bits += ['-o', 'BatchMode yes']
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if self.options.check_host_keys == 'enforce':
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bits += ['-o', 'StrictHostKeyChecking yes']
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if self.options.check_host_keys == 'accept':
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bits += ['-o', 'StrictHostKeyChecking ask']
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elif self.options.check_host_keys == 'ignore':
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bits += [
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'-o', 'StrictHostKeyChecking no',
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'-o', 'UserKnownHostsFile /dev/null',
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'-o', 'GlobalKnownHostsFile /dev/null',
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]
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if self.options.ssh_args:
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bits += self.options.ssh_args
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bits.append(self.options.hostname)
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base = super(Connection, self).get_boot_command()
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base_parts = []
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for s in base:
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val = s if s in self.SHLEX_IGNORE else shlex_quote(s).strip()
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base_parts.append(val)
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return bits + base_parts
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