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8c8e064828
Symlinks inside of the chroot were failng because we weren't able to
determine if they were pointing to a real file or not. We could write
some complicated code to walk the symlink path taking into account where
the root of the tree is but that could be fragile. Since this is just
a sanity check, instead we just assume that the chroot is fine if we
find that /bin/sh in the chroot is a symlink. Can revisit if it turns
out that many chroots have a /bin/sh that's a broken symlink.
Fixes #16097
174 lines
7.3 KiB
Python
174 lines
7.3 KiB
Python
# Based on local.py (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
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# (c) 2013, Maykel Moya <mmoya@speedyrails.com>
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# (c) 2015, Toshio Kuratomi <tkuratomi@ansible.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import distutils.spawn
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import os
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import os.path
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import pipes
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import subprocess
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import traceback
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from ansible import constants as C
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from ansible.errors import AnsibleError
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from ansible.plugins.connection import ConnectionBase, BUFSIZE
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from ansible.module_utils.basic import is_executable
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from ansible.utils.unicode import to_bytes
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try:
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from __main__ import display
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except ImportError:
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from ansible.utils.display import Display
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display = Display()
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class Connection(ConnectionBase):
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''' Local chroot based connections '''
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transport = 'chroot'
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has_pipelining = True
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# su currently has an undiagnosed issue with calculating the file
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# checksums (so copy, for instance, doesn't work right)
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# Have to look into that before re-enabling this
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become_methods = frozenset(C.BECOME_METHODS).difference(('su',))
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def __init__(self, play_context, new_stdin, *args, **kwargs):
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super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
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self.chroot = self._play_context.remote_addr
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if os.geteuid() != 0:
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raise AnsibleError("chroot connection requires running as root")
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# we're running as root on the local system so do some
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# trivial checks for ensuring 'host' is actually a chroot'able dir
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if not os.path.isdir(self.chroot):
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raise AnsibleError("%s is not a directory" % self.chroot)
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chrootsh = os.path.join(self.chroot, 'bin/sh')
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# Want to check for a usable bourne shell inside the chroot.
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# is_executable() == True is sufficient. For symlinks it
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# gets really complicated really fast. So we punt on finding that
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# out. As long as it's a symlink we assume that it will work
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if not (is_executable(chrootsh) or (os.path.lexists(chrootsh) and os.path.islink(chrootsh))):
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raise AnsibleError("%s does not look like a chrootable dir (/bin/sh missing)" % self.chroot)
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self.chroot_cmd = distutils.spawn.find_executable('chroot')
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if not self.chroot_cmd:
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raise AnsibleError("chroot command not found in PATH")
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def _connect(self):
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''' connect to the chroot; nothing to do here '''
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super(Connection, self)._connect()
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if not self._connected:
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display.vvv("THIS IS A LOCAL CHROOT DIR", host=self.chroot)
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self._connected = True
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def _buffered_exec_command(self, cmd, stdin=subprocess.PIPE):
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''' run a command on the chroot. This is only needed for implementing
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put_file() get_file() so that we don't have to read the whole file
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into memory.
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compared to exec_command() it looses some niceties like being able to
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return the process's exit code immediately.
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'''
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executable = C.DEFAULT_EXECUTABLE.split()[0] if C.DEFAULT_EXECUTABLE else '/bin/sh'
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local_cmd = [self.chroot_cmd, self.chroot, executable, '-c', cmd]
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display.vvv("EXEC %s" % (local_cmd), host=self.chroot)
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local_cmd = [to_bytes(i, errors='strict') for i in local_cmd]
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p = subprocess.Popen(local_cmd, shell=False, stdin=stdin,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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return p
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def exec_command(self, cmd, in_data=None, sudoable=False):
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''' run a command on the chroot '''
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super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
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p = self._buffered_exec_command(cmd)
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stdout, stderr = p.communicate(in_data)
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return (p.returncode, stdout, stderr)
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def _prefix_login_path(self, remote_path):
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''' Make sure that we put files into a standard path
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If a path is relative, then we need to choose where to put it.
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ssh chooses $HOME but we aren't guaranteed that a home dir will
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exist in any given chroot. So for now we're choosing "/" instead.
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This also happens to be the former default.
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Can revisit using $HOME instead if it's a problem
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'''
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if not remote_path.startswith(os.path.sep):
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remote_path = os.path.join(os.path.sep, remote_path)
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return os.path.normpath(remote_path)
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def put_file(self, in_path, out_path):
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''' transfer a file from local to chroot '''
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super(Connection, self).put_file(in_path, out_path)
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display.vvv("PUT %s TO %s" % (in_path, out_path), host=self.chroot)
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out_path = pipes.quote(self._prefix_login_path(out_path))
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try:
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with open(to_bytes(in_path, errors='strict'), 'rb') as in_file:
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try:
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p = self._buffered_exec_command('dd of=%s bs=%s' % (out_path, BUFSIZE), stdin=in_file)
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except OSError:
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raise AnsibleError("chroot connection requires dd command in the chroot")
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try:
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stdout, stderr = p.communicate()
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except:
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traceback.print_exc()
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raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
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if p.returncode != 0:
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raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
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except IOError:
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raise AnsibleError("file or module does not exist at: %s" % in_path)
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def fetch_file(self, in_path, out_path):
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''' fetch a file from chroot to local '''
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super(Connection, self).fetch_file(in_path, out_path)
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display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self.chroot)
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in_path = pipes.quote(self._prefix_login_path(in_path))
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try:
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p = self._buffered_exec_command('dd if=%s bs=%s' % (in_path, BUFSIZE))
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except OSError:
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raise AnsibleError("chroot connection requires dd command in the chroot")
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with open(to_bytes(out_path, errors='strict'), 'wb+') as out_file:
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try:
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chunk = p.stdout.read(BUFSIZE)
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while chunk:
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out_file.write(chunk)
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chunk = p.stdout.read(BUFSIZE)
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except:
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traceback.print_exc()
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raise AnsibleError("failed to transfer file %s to %s" % (in_path, out_path))
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stdout, stderr = p.communicate()
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if p.returncode != 0:
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raise AnsibleError("failed to transfer file %s to %s:\n%s\n%s" % (in_path, out_path, stdout, stderr))
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def close(self):
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''' terminate the connection; nothing to do here '''
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super(Connection, self).close()
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self._connected = False
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