Note that not only kmod needs this permission, other libkmod consumers
like udev require it, too. Hence I'm adding the permission to the
relevant interfaces.
systemd relabels everything in /dev and /run after loading the policy.
In these directories there is a socket file for udev, /run/udev/control,
which is not allowed to be relabelled from tmpfs_t:
avc: denied { relabelfrom } for pid=1 comm="systemd"
name="control" dev="tmpfs" ino=7027
scontext=system_u:system_r:init_t tcontext=system_u:object_r:tmpfs_t
tclass=sock_file permissive=1
avc: denied { relabelto } for pid=1 comm="systemd" name="control"
dev="tmpfs" ino=7027 scontext=system_u:system_r:init_t
tcontext=system_u:object_r:udev_var_run_t tclass=sock_file
permissive=1
/run/tmpfiles.d directory (used by systemd-tmpfiles service) is also
relabelled.
This is currently denied:
avc: denied { create } for pid=1 comm="systemd" name="pts"
scontext=system_u:system_r:init_t
tcontext=system_u:object_r:devpts_t tclass=dir permissive=1
This is a minor update of the last attempt at this patch.
Changes in .fc to label /etc/rsyslog.d(/.*)? as syslog_conf_t so all rsyslog config files are labeled syslog_conf_t (not just /etc/r?syslog.conf). Update .te file to allow rsyslog to read the directory now labeled syslog_conf_t (files of this type were already readable). Final (and new) change is in logging_admin_syslog interface so files_etc_filetrans now includes the optional filename so /etc/r?syslog.conf would be labeled correctly when created in etc_t.
The overall goal of this patch is that a domain using the logging_admin_syslog is able to create/edit files in /etc/rsyslog.d and they get created as syslog_conf_t AND other files created in /etc (or other etc_t labeled directory) don't get created with the syslog_conf_t type as they are not necessarily syslog configuration files.
Dave Sugar
dsugar@tresys.com
Signed-off-by: Dave Sugar <dsugar@tresys.com>
Label RHEL specific systemd binaries /usr/lib/systemd/rhel* as initrc_exec_t.
Now in the proper location.
Signed-off-by: Dave Sugar <dsugar@tresys.com>
The following patch allows systemd_nspawn_t to create directories under /tmp
and use them as mountpoints. Also allows systemd_nspawn_t to umount cgroup
filesystems.
Allows systemd_backlight_t to search /var/lib.
When auditctl logs a message to syslog, it needs to read /etc/localtime.
This is currently denied:
avc: denied { read } for pid=191 comm="auditctl" name="UTC"
dev="vda1" ino=394043 scontext=system_u:system_r:auditctl_t
tcontext=system_u:object_r:locale_t tclass=file permissive=1
avc: denied { open } for pid=191 comm="auditctl"
path="/usr/share/zoneinfo/UTC" dev="vda1" ino=394043
scontext=system_u:system_r:auditctl_t
tcontext=system_u:object_r:locale_t tclass=file permissive=1
This occurs for example at boot time when "/usr/bin/augenrules --load"
is run [1]. Here is an extract of "strace -s 256 -f /usr/bin/augenrules
--load":
[pid 635] execve("/sbin/auditctl", ["/sbin/auditctl", "-R",
"/etc/audit/audit.rules"], 0x1e77d80 /* 16 vars */) = 0
...
[pid 635] open("/etc/audit/audit.rules", O_RDONLY) = -1 ENOENT (No
such file or directory)
[pid 635] open("/etc/localtime", O_RDONLY|O_CLOEXEC) = 4
[pid 635] fstat(4, {st_mode=S_IFREG|0644, st_size=127, ...}) = 0
[pid 635] fstat(4, {st_mode=S_IFREG|0644, st_size=127, ...}) = 0
[pid 635] read(4, "TZif2\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 127
[pid 635] lseek(4, -71, SEEK_CUR) = 56
[pid 635] read(4, "TZif2\0\0\0\0\0\0\0\0\0\0\0", 4096) = 71
[pid 635] close(4) = 0
[pid 635] socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 4
[pid 635] connect(4, {sa_family=AF_UNIX, sun_path="/dev/log"}, 110) = 0
[pid 635] sendto(4, "<14>Aug 12 08:59:53 auditctl: file
/etc/audit/audit.rules doesn't exist, skipping", 81, MSG_NOSIGNAL,
NULL, 0) = 81
[pid 635] exit_group(0) = ?
More precisely, auditctl uses vsyslog() from glibc, which uses
localtime_r() to fetch the time is in local timezone.
[1] On a systemd system, this command is automatically run by
auditd.service unit, cf.
https://github.com/linux-audit/audit-userspace/blob/v2.7.7/init.d/auditd.service#L21
Remove complement (~) and wildcard (*) in allow rules so that there are no
unintentional additions when new permissions are declared.
This patch does not add or remove permissions from any rules.
Not auditing this turns out to be the wrong choice for
several reasons.
For normal application functioning the user domain
should be able to create netlink_kobject_uvent_socket
sockets.
Signed-off-by: Guido Trentalancia <guido@trentalancia.com>
This won't match subdirectories of /usr/lib, but that shouldn't be a
problem, since we have "allow domain lib_t ..." anyway.
We can't match on "/usr/(.*/)?man(/.*)?", since that'd result in a few
false positives; in particular, the files
/usr/share/xmlto/format/docbook/man
/usr/share/bash-completion/completions/man
Kernel commit 6941857e82ae ("selinux: add a map permission check
for mmap") added a map permission check on mmap so that we can
distinguish memory mapped access (since it has different implications
for revocation). The purpose of a separate map permission check on
mmap(2) is to permit policy to prohibit memory mapping of specific files
for which we need to ensure that every access is revalidated, particularly
useful for scenarios where we expect the file to be relabeled at runtime
in order to reflect state changes (e.g. cross-domain solution, assured
pipeline without data copying). The kernel commit is anticipated to
be included in Linux 4.13.
This refpolicy change defines map permission for refpolicy. It mirrors
the definition in the kernel classmap by adding it to the common
definitions for files and sockets. This will break compatibility for
kernels that predate the dynamic class/perm mapping support (< 2.6.33,
< RHEL 6); on such kernels, one would instead need to add map permission
to the end of each file and socket access vector.
This change only allows map permission as needed, e.g. only in the
mmap_file_perms and exec_file_perms object permission sets
(since map is always required there) and only in specific interfaces
or modules where denials were observed in limited testing.
It is important to note that effective use of this permission requires
complete removal of unconfined, as otherwise unconfined domains will be
able to map all file types and therefore bypass the intended protection.
If we wanted to exclude map permission to all file types by default from
unconfined, we would need to add it to the list of permissions excluded from
files_unconfined_type in kernel/files.te.
Policies that depend on this permission not being allowed to specific file
types should also make use of neverallow rules to ensure that this is not
undermined by any allow rule, and ensure that they are performing neverallow
checking at policy build time (e.g. make validate) or runtime (e.g.
semanage.conf expand-check=1).
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Setting this service option to 'full' or 'strict' will also remount the
/etc directory. Allow this in the policy.
This fixes the systemd-networkd service, but will also positively affect
any other service using the above hardening option.
Since app-admin/setools-4.1.0, some python internals try to create and
execute a file in /tmp during semanage initalization, causing semanage
to crash. Here's the backtrace (with the path
"/usr/lib64/python3.4/site-packages" replaced by "py" for brevity):
Traceback (most recent call last):
File "/usr/lib/python-exec/python3.4/semanage", line 28, in <module>
import seobject
File "py/seobject.py", line 34, in <module>
import sepolicy
File "py/sepolicy/__init__.py", line 8, in <module>
import setools
File "py/setools/__init__.py", line 77, in <module>
from .infoflow import InfoFlowAnalysis
File "py/setools/infoflow.py", line 22, in <module>
import networkx as nx
File "py/networkx/__init__.py", line 93, in <module>
import networkx.linalg
File "py/networkx/linalg/__init__.py", line 9, in <module>
from networkx.linalg.algebraicconnectivity import *
File "py/networkx/linalg/algebraicconnectivity.py", line 18, in <module>
from numpy import (array, asmatrix, asarray, dot, matrix, ndarray, ones,
File "py/numpy/__init__.py", line 180, in <module>
from . import add_newdocs
File "py/numpy/add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "py/numpy/lib/__init__.py", line 8, in <module>
from .type_check import *
File "py/numpy/lib/type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "py/numpy/core/__init__.py", line 22, in <module>
from . import _internal # for freeze programs
File "py/numpy/core/_internal.py", line 14, in <module>
import ctypes
File "/usr/lib64/python3.4/ctypes/__init__.py", line 541, in <module>
_reset_cache()
File "/usr/lib64/python3.4/ctypes/__init__.py", line 280, in _reset_cache
CFUNCTYPE(c_int)(lambda: None)
MemoryError
Improve the initrc domain within the init module with some permissions
needed for a smoother boot.
Let the iptables init scripts read the iptables configuration.
Signed-off-by: Guido Trentalancia <guido@trentalancia.net>
Improve the locallogin module by curbing on dac_override permissions
in the sulogin domain (read/search permissions only).
Thanks to Dominick Grift for suggesting this.
Other modules are likely affected by the same issue.
Signed-off-by: Guido Trentalancia <guido@trentalancia.net>
Luis Ressel
Chris PeBenito
Nicolas Iooss
David Sugar
Russell Coker
Krzysztof Nowicki
Guido Trentalancia
cgzones
Stephen Smalley
Jason Zaman
Guido Trentalancia