SELinux (Security-Enhanced Linux) is an implementation of a flexible mandatory, role-based access control architecture on Linux. It is primarily used to confine system processes.

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How to understand the security context in “ls -Z”?

After referring "man ls", it shows "ls -Z" can display the security context: -Z, --context Display security context so it fits on most displays. Displays only mode, user, group, security ...
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linux commandline can connect but webserver (or php) can't connect

We can connect to a specific url with linux (centos 6) commandline (curl, wget,...) But we can't connect to it by webserver (apache) or php. I did 'setenforce 0' command, after that webserver and ...
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Where to put the SElinux policy to allow acpid shutdown the system?

I'm using Centos7 minimal. I've installed acpid and the daemon is running. When I hit the power button, I get the following in /var/log/messages May 2 18:52:53 localhost systemd-logind: Power key ...
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SELinux is preventing /opt/google/chrome/chrome-sandbox from write access on which file?

I keep getting the following error ever since upgrading to Chrome google-chrome-stable-42.0.2311.90-1.x86_64. SELinux is preventing /opt/google/chrome/chrome-sandbox from write access on the ...
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47 views

Fedora 21 shutdown and reboot error

Recently I have been using Fedora 21 and I have an issue where sometimes I shut down and reboot and the system just hangs at the fedora logo and never actually boots. I noticed the issue after ...
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56 views

chcon: failed to change context of `/etc/oddjobd.conf.d' to `unconfined_u:object_r:oddjob_t:s0': Permission denied

A friend of mine had trouble with SELinux. The server is configured with SELinux in enforcing mode, using the targeted policy. When using Puppet, restorecon or chcon, he had errors like this, even if ...
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22 views

SELinux context on CentOS 7

I installed CentOS 7 on my server and tried to deploy phpBB. I realized that SELinux was on when the directories were 'Unwritable'. I setenforce to 0 and completed the installation. However I'd like ...
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31 views

Cannot execute semanage fcontext --add under Fedora 21 using policy targeted

I cannot add a file contexts to the running SELinux policy using semanage under Fedora 21. When executing the semanage fcontext --add command, I receive an OSError: mf@vienna ~ % sudo semanage ...
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36 views

How do I troubleshoot these SELinux AVC errors?

Background: I have a CentOS 6 LAMP server. Recently the server has started to become unresponsive every few days. Originally, mysqld would throw a nagios alert and I would be unable to even ssh into ...
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33 views

SELinux “training” ( permissive mode logs )

Alright I've been skimming various articles and videos. They all say the same basic thing: start with the default policy, run in permissive to see what needs to be fixed. Then modify your policies to ...
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67 views

How to protect against data leak?

We have a few workstations that have access to a network share with all our company files. This is correct, because users may need to use them. However our boss is concerned that someone (upon ...
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SELinux log on Debian Wheezy

I'm currently playing around with SELinux on a Debian Wheezy VM. I've seen a video by a RedHat employee talking about how easy SELinux is to use and that everything will be logged into ...
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27 views

What is SELinux's regex type?

I'm trying to locate all files on my system matching an SELinux file context (fcontext). These contexts are specified using some regex, and I'd like to use find -regex ... to the same effect. However, ...
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114 views

SELinux + logrotate + prerotate = Permission Denied

I have what (should) be a fairly straightforward task: Migrate a set of custom log files to a database at night. I use logrotate (cron.daily) with a simple prerotate task /var/log/myapplog/*.log { ...
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39 views

How can I enable ufw automatically on boot?

sudo ufw enable Firewall is active and enabled on system startup sudo ufw status Status: active But after I restart the system and run sudo ufw status, I get the message: Status: inactive How ...
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190 views

Restarting OpenVPN on SELinux by a cronjob

I have a server with some OpenVPN instances (one server, several clients) running on Debian with enforcing SELinux. The connections to some of the VPN servers my machine is connecting to are somewhat ...
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71 views

Tech expert says you are much safer using Windows than Fedora. [closed]

A tech expert at Michigan State University said today in his talk on campus that with Windows at least you can install ZoneAlarm. Fedora on the other hand has a firewall that is too complex to figure ...
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SELinux: bin_t type socket-application can access http_port_t ports

I am trying to compromising my application (myapp) to use limited ports. For that, I have decided to assign httpd_t type to myapp. So, myapp could use only http_port_t typed ports & I could ...
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15 views

kernel security and IDS Firewall + AV together or not?

I try to hardening my server. For doing so, I got a general question: Should I install kernel security patches like selinux and an Anti-Virus with Intrusion Detection Firewall? Does it make sense to ...
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36 views

SELinux Enforcing is preventing logging into another user account?

I am using Debian 6 with SELinux enabled. After enabling "enforcing" mode in SElinux, I have tried to login into another user account by 'login' command. But, I have been restricted by selinux. ...
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SELinux: 'chcon' is not reflected in another user account

I am using Debian 6 with SELinux enabled. For testing, I have tried to block access to date command for users. Now, I have mapped 'Test_Unix_User' account to 'user_u' SELinux account. 'user_r' can ...
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1answer
65 views

How to put dracut to initframs?

I try to make SElinux permissive. I changed the config from disabled to permissive. However, I guess it does not recognize that change. In the red hat web site, It says : If the system was ...
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63 views

how do i build / apply an selinux policy file, on redhat 7?

I'm trying to install RabbitMQ on Redhat Linux 7 (RHEL7). I followed the instructions on the RabbitMQ site, and it installed fine. However, it won't run because SELinux is preventing Erlang from ...
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59 views

How to recompile ImageMagick to detect the DELEGATES

I am using Imagemagick(6.4.3.6-7.18.x86_64) in SLES11 SP2 Using it like bellow.. import -window $wid $jpg and getting this error import: DelegateLibrarySupportNotBuiltIn `' (X11) @ ...
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168 views

Problem running “selinux sandbox” with java

I am trying to sandbox a java application using selinux sandbox. System details: Redhat 6 | x86_64 | no x server install | jdk7 from oracle tar.gz version | cgred and cgconfig are stop The cmd ...
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43 views

SELinux ignoring configuration?

I'm using Vagrant and VirtualBox to run a CentOS 6.5 VM. In /etc/sysconfig/selinux I have set SELINUX=permissive. However, everytime I restart the VM, sudo getenforce shows SELinux as Enforcing. ...
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77 views

How to transition into another domain when invoking sudo?

I have a daemon (collectd) that executes a script for data collection (via smartctl). The exec-plugin of collectd mandates that external scripts are executed under a user != root. The plan is to set ...
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34 views

How do I find/list all files on filesystem with a certain SELinux “fcontext”

I'm having trouble finding information on what command, presumably from setools, I should use to find all the files on my filesystem that are labeled by SELinux with a certain file-context (fcontext). ...
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45 views

Can't modify or delete SELinux user

I was playing around with user_u in the targeted policy on RHEL 6.5. I'm logged in as root in the unconfined context, so I have full ability to change anything I want. I've also switched to ...
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45 views

SELinux Sandbox Usage

What am I doing wrong in the following, from the man file and internet it looks like this is right. $ echo "hello world" 1> test $ sandbox -i test cat test /usr/bin/cat: test: Permission denied
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39 views

SELinux error when yum updated pcre package

When doing a yum update, I got the following errors: Updating : pcre-8.33-7.fc20.i686 82/164 libsepol.module_package_read_offsets: module package header ...
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Acpid event denied by SELinux, how can I savely allow the event without opening security holes?

I installed Fedora (3.17.2-200.fc20.x86_64) on my new Notebook (Lenovo Yoga Pad) and wanted to add this script to trigger whenever I flip over my screen. The script triggered whith the event is ...
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55 views

How to get SELinux to prevent Apache/HTTPD from reading specific files

What am I missing with SELinux? I thought it was supposed to be another layer of security but I built a web page vulnerable to command injection and it can basically traverse most of my file system. ...
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34 views

SELinux. Prevent Apache/HTTPD from reading specific files.

What am I missing with SELinux, i thought it was suppose to be another layer of security but i built a vulnerable web page vulnerable to command injection and it can basically traverse most of my file ...
2
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1answer
236 views

SELinux and OpenVPN?

Having Fedora 20 64-bit installed, I have this old problem of conflicting OpenVPN and SELinux. Obviously SELinux prevents openvpn from launching. The OpenVPN has been set through Network Connection ...
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2answers
63 views

Enabling SELinux on RHEL

I am using RHEL 6.5 and I need to enable SELinux. I have tried following commands, but it is of no help: $ setenforce 1 $ echo 1 > /selinux/enforce Note: I also tried editing ...
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71 views

is there any use for /selinux folder, when I don't use selinux?

I'm using Debian Wheezy, and by default a folder /selinux exists on my filesystem, even though I'm not (knowingly) using any SELinux infrastructure. I know that SELinux is intertwined with some ...
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118 views

Cannot label F2FS (SELinux)

I'm running Arch Linux [testing] x86_64 For some reasons, I can't relabel my root file system (F2FS) with SELinux (custom kernel compiled, using refpolicy) Kernel ver $ uname -a ...
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137 views

SELinux disabled, net.ipv4.tcp_syncookies and nfs

OS is RHEL 6.2. I appear to be having an issue with SELinux. I've disabled it in /etc/sysconfig/selinux, however, when my host starts the command sestatus show that I'm in permissive mode. Searches ...
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121 views

How do I remedy SELinux not allowing legit programs in use access to my system?

I have a system where some programs are getting access denied in SELinux when performing their duties. These programs are ClamAV, fail2ban and Logwatch. I think I've managed to allow all the access ...
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74 views

Accidental modified SELinux context on root account to staff_u

I logged in as a normal account(test) on my CentOS 6.5 VM and sudo su - root and run usermod -Z staff_u test but looks like it changed my root account to staff_u as well, now I am stuck, could not ...
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113 views

Altermime and SELINUX

I've setup an application called altermime (http://www.pldaniels.com/altermime/) for postfix (SMTP server) which alters emails midstream. I'm injecting a "X-ListUnsubscribe" header into every email ...
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279 views

Compiling Awesome from source on CentOS: cannot find libraries

I am trying to install awesome (v3.5.5) on CentOS7. Since I could not find a repository that carries it, I am compiling it from source. However, I am getting this error on running make: -- checking ...
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458 views

Cannot delete File on Fedora

I have a file with following permission: -rwSr-s---. 1 1634630331 1818884080 118784 Jun 29 1970 DailyUpdateClass.class If I try to delete this file with root login, I get error. rm: cannot remove ...
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339 views

What should be the security context of these cron files?

I am running Fedora 20 and I am having some issues when running logrotate and anacron which I suspect may be related to SELinux: Failed to determine timestamp: Cannot assign requested address chgrp: ...
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How to disable SELinux without restart?

I need to disable SELinux but cannot restart the machine i followed this link where i get bellow command setenforce 0 But agter running this command i checked for that sestatus SELinux status: ...
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99 views

Why does Linux come with SELinux?

If SELinux was created by NSA and published by United States Department of Defence then why the hell does it come with the barebone Linux kernel? Isn’t Linux all about security and privacy? Also, is ...
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5k views

Redhat “httpd” can not start anymore. Showing “suEXEC” and “SELinux” notices

I'm on RHEL 6.5 and Apache 2.2.15. When I restart the httpd, I can not start that httpd anymore. Showing following things in the /var/log/httpd/error_log: [Fri Aug 01 18:31:48 2014] [notice] suEXEC ...
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1answer
547 views

Virtual Host only works when SELinux is set to permissive - why?

Wondering why my virtual hosts will only work when SELinux is set to "permissive". When SELinux is set to "enforce" my virtual hosts are ignored and default host is shown. Apache/2.2.15 (Unix) Here ...
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2answers
701 views

groupadd failure while writing changes to /etc/group

I have been following this guide on installing debian-kit on my Sony Xperia Tablet Z and the installation goes fine until I try to apt-get install andromize which fails with the error groupadd: ...