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# Copyright (C) 2007 Red Hat, Inc., Eugene Teo <eteo@redhat.com>
# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.
import pwd
from glob import glob
from sos.report.plugins import Plugin, IndependentPlugin, PluginOpt
class Ssh(Plugin, IndependentPlugin):
short_desc = 'Secure shell service'
plugin_name = 'ssh'
profiles = ('services', 'security', 'system', 'identity')
option_list = [
PluginOpt('userconfs', default=True, val_type=str,
desc=('Changes whether module will '
'collect user .ssh configs'))
]
def setup(self):
self.add_file_tags({
'/etc/ssh/sshd_config$': 'sshd_config',
'/etc/ssh/ssh_config$': 'ssh_config'
})
sshcfgs = [
"/etc/ssh/ssh_config",
"/etc/ssh/sshd_config",
"/etc/ssh/sshd_config.d/*",
]
# Include main config files
self.add_copy_spec(sshcfgs)
self.included_configs(sshcfgs)
# If userconfs option is set to False, skips this
if self.get_option('userconfs'):
self.user_ssh_files_permissions()
def included_configs(self, sshcfgs):
""" Include subconfig files """
# Read configs for any includes and copy those
try:
cfgfiles = [
f for files in [
glob(copyspec, recursive=True) for copyspec in sshcfgs
] for f in files
]
for sshcfg in cfgfiles:
tag = sshcfg.split('/')[-1]
with open(self.path_join(sshcfg), 'r',
encoding='UTF-8') as cfgfile:
for line in cfgfile:
# skip empty lines and comments
if len(line.split()) == 0 or line.startswith('#'):
continue
# ssh_config keywords are allowed as case-insensitive
if line.lower().startswith('include'):
confarg = line.split()
self.add_copy_spec(confarg[1], tags=tag)
except Exception: # pylint: disable=broad-except
pass
def user_ssh_files_permissions(self):
"""
Iterate over .ssh folders in user homes to see their permissions.
Bad permissions can prevent SSH from allowing access to given user.
"""
users_data = pwd.getpwall()
fs_mount_info = {}
try:
with open('/proc/mounts', "r", encoding='UTF-8') as mounts_file:
for line in mounts_file:
(fs_file, fs_vstype) = line.split()[1:3]
fs_mount_info[fs_file] = fs_vstype
except Exception:
self._log_error("Couldn't read /proc/mounts")
return
non_local_fs = {'nfs', 'nfs4', 'autofs'}
# Read the home paths of users in the system and check the ~/.ssh dirs
for user in users_data:
if user.pw_dir in fs_mount_info and \
fs_mount_info[user.pw_dir] in non_local_fs:
self._log_info(
f"Skipping capture in {user.pw_dir}"
" because it's a remote directory"
)
continue
home_dir = self.path_join(user.pw_dir, '.ssh')
self.add_dir_listing(home_dir)
# vim: set et ts=4 sw=4 :