Source code for insights.combiners.selinux


Combiner for more complex handling of SELinux being disabled by any means
available to the users. It uses results of
:class:`insights.parsers.sestatus.SEStatus`, and
:class:`insights.parsers.selinux_config.SelinuxConfig` parsers and
:class:`insights.combiners.grub_conf.GrubConf` combiner.

It contains a dictionary ``problems`` in which it stores detected problems with
keys as follows and values are parsed lines with detected problem:

* ``sestatus_disabled`` - SELinux is disabled on runtime.
* ``sestatus_not_enforcing`` - SELinux is not in enforcing mode.
* ``grub_disabled`` - SELinux is set in Grub to be disabled.
* ``grub_not_enforcing`` - SELinux is set in Grub to not be in enforcing mode.
* ``selinux_conf_disabled`` - SELinux is set in configuration file to be disabled.
* ``sestatus_not_enforcing`` - SELinux is set in configuration file to not be in enforcing mode.

    >>> selinux = shared[SELinux]
    >>> selinux.ok()
    >>> selinux.problems
    {'grub_disabled': ['/vmlinuz-2.6.32-642.el6.x86_64 selinux=0 ro root= ...'],
     'selinux_conf_disabled': 'disabled',
     'sestatus_not_enforcing': 'permissive'}

from ..core.plugins import combiner
from ..parsers.sestatus import SEStatus
from ..combiners.grub_conf import GrubConf
from ..parsers.selinux_config import SelinuxConfig

GRUB_DISABLED = 'grub_disabled'
GRUB_NOT_ENFORCING = 'grub_not_enforcing'
RUNTIME_DISABLED = 'sestatus_disabled'
RUNTIME_NOT_ENFORCING = 'sestatus_not_enforcing'
BOOT_DISABLED = 'selinux_conf_disabled'
BOOT_NOT_ENFORCING = 'selinux_conf_not_enforcing'

[docs]@combiner(SEStatus, SelinuxConfig, optional=[GrubConf]) class SELinux(object): """ A combiner for detecting that SELinux is enabled and running and also enabled at boot time. """ def __init__(self, se_status, selinux_config, grub_conf): self.problems = {} self.sestatus = se_status self.selinux_config = selinux_config self.grub_config = grub_conf.grub if grub_conf else None self._check_sestatus() self._check_boot_config() self._check_grub_config() def _check_sestatus(self): """ Check runtime SELinux configuration from sestatus output. Values of output from sestatus command are always lowercase. """ if['selinux_status'] != 'enabled': self.problems[RUNTIME_DISABLED] =['selinux_status'] elif['current_mode'] != 'enforcing': self.problems[RUNTIME_NOT_ENFORCING] =['current_mode'] def _check_boot_config(self): """ Check that SELinux is not disabled in /etc/sysconfig/selinux. This file determines the boot configuration for SELinux. """ opt_value ='SELINUX') if opt_value is None: self.problems[BOOT_NOT_ENFORCING] = 'Missing in config (Permissive by default)' elif opt_value == 'disabled': self.problems[BOOT_DISABLED] = opt_value elif opt_value != 'enforcing': self.problems[BOOT_NOT_ENFORCING] = opt_value def _check_grub_config(self): """ Check grub and grub 2 for kernel boot options if selinux settings is not overriden. Experiments confirmed that only lowercase is accepted in grub configuration. grub is in rhel-6 and the boot line looks usually like kernel /boot/vmlinuz-2.4.20-selinux-2003040709 ro root=/dev/hda1 nousb selinux=0 grub 2 is in rhel-7 and rhel-8, the boot line of grub 2 in rhel-7 looks usually like linux16 /vmlinuz-0-rescue-9f20b35c9faa49aebe171f62a11b236f root=/dev/mapper/rhel-root ro crashkernel=auto rhgb quiet the boot line of grub 2 in rhel-8 looks usually like options root=/dev/mapper/rhel_vm37--146-root ro crashkernel=auto resume=/dev/mapper/rhel_vm37--146-swap $tuned_params """ conf = self.grub_config.boot_entries if self.grub_config is not None else [] se_dis = [e.cmdline for e in conf if 'selinux=0' in e.cmdline] if se_dis: self.problems[GRUB_DISABLED] = se_dis se_noe = [e.cmdline for e in conf if 'enforcing=0' in e.cmdline] if se_noe: self.problems[GRUB_NOT_ENFORCING] = se_noe
[docs] def ok(self): """ Checks if there are any problems with SELinux configuration. Returns bool: True if SELinux is enabled and functional, false otherwise. """ return not bool(self.problems)