Remove SELinux Permissive checks

Anaconda, Lorax, lorax-composer, and livemedia-creator can all now run
with SELinux in Enforcing mode. It does not need to be disabled and if
there are denials they should be reported as a bug.

Log the current state of SELinux when starting, update the
documentation.

Resolves: rhbz#1654795
(cherry picked from commit 482d6277e0)

src/pylorax/__init__.py

@@ -194,6 +194,8 @@ class Lorax(BaseLoraxClass):
         self.init_file_logging(logdir)
 
         logger.debug("version is %s", vernum)
+        log_selinux_state()
+
         logger.debug("using work directory %s", self.workdir)
         logger.debug("using log directory %s", logdir)
 
@@ -209,22 +211,6 @@ class Lorax(BaseLoraxClass):
             logger.critical("no root privileges")
             sys.exit(1)
 
-        # is selinux disabled?
-        # With selinux in enforcing mode the rpcbind package required for
-        # dracut nfs module, which is in turn required by anaconda module,
-        # will not get installed, because it's preinstall scriptlet fails,
-        # resulting in an incomplete initial ramdisk image.
-        # The reason is that the scriptlet runs tools from the shadow-utils
-        # package in chroot, particularly groupadd and useradd to add the
-        # required rpc group and rpc user. This operation fails, because
-        # the selinux context on files in the chroot, that the shadow-utils
-        # tools need to access (/etc/group, /etc/passwd, /etc/shadow etc.),
-        # is wrong and selinux therefore disallows access to these files.
-        logger.info("checking the selinux mode")
-        if selinux.is_selinux_enabled() and selinux.security_getenforce():
-            logger.critical("selinux must be disabled or in Permissive mode")
-            sys.exit(1)
-
         # do we have a proper yum base object?
         logger.info("checking yum base object")
         if not isinstance(ybo, yum.YumBase):
@@ -384,3 +370,13 @@ def get_buildarch(ybo):
         sys.exit(1)
 
     return buildarch
+
+def log_selinux_state():
+    """Log the current state of selinux"""
+    if selinux.is_selinux_enabled():
+        if selinux.security_getenforce():
+            logger.info("selinux is enabled and in Enforcing mode")
+        else:
+            logger.info("selinux is enabled and in Permissive mode")
+    else:
+        logger.info("selinux is Disabled")

src/pylorax/installer.py

@@ -240,14 +240,6 @@ def novirt_install(opts, disk_img, disk_size, repo_url, cancel_func=None):
     """
     Use Anaconda to install to a disk image
     """
-    import selinux
-
-    # Set selinux to Permissive if it is Enforcing
-    selinux_enforcing = False
-    if selinux.is_selinux_enabled() and selinux.security_getenforce():
-        selinux_enforcing = True
-        selinux.security_setenforce(0)
-
     # Clean up /tmp/ from previous runs to prevent stale info from being used
     for path in ["/tmp/yum.repos.d/", "/tmp/yum.cache/", "/tmp/yum.root/", "/tmp/yum.pluginconf.d/"]:
         if os.path.isdir(path):
@@ -320,9 +312,6 @@ def novirt_install(opts, disk_img, disk_size, repo_url, cancel_func=None):
             log.debug("Removing loop device for %s", disk_img)
             loop_detach("/dev/"+get_loop_name(disk_img))
 
-    if selinux_enforcing:
-        selinux.security_setenforce(1)
-
     if rc:
         raise InstallError("novirt_install failed")
 

src/sbin/livemedia-creator

@@ -27,7 +27,7 @@ import os
 import sys
 import tempfile
 
-from pylorax import vernum
+from pylorax import vernum, log_selinux_state
 from pylorax.creator import DRACUT_DEFAULT, run_creator
 from pylorax.imgutils import default_image_name
 from pylorax.sysutils import joinpaths
@@ -225,6 +225,7 @@ def main():
     setup_logging(opts)
 
     log.info("livemedia-creator %s", vernum)
+    log_selinux_state()
     log.debug( opts )
 
     if os.getuid() != 0:

src/sbin/lorax

@@ -45,7 +45,7 @@ import yum
 # handler setup.  We already set one up so we don't need it to run.
 yum.logginglevels._added_handlers = True
 import pylorax
-from pylorax import DRACUT_DEFAULT
+from pylorax import DRACUT_DEFAULT, log_selinux_state
 
 VERSION = "{0}-{1}".format(os.path.basename(sys.argv[0]), pylorax.vernum)
 
@@ -239,6 +239,7 @@ def main(args):
     if not os.path.exists(opts.tmp):
         os.makedirs(opts.tmp)
 
+    log_selinux_state()
     tempfile.tempdir = opts.tmp
 
     # Remove any orphaned lorax tempdirs