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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selinux can you explain it to me in Jo simplest way [on hold]

Hi am writing my red hat exam 200 and know a lot but am stuck with this SELinux
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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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29 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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58 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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57 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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36 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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82 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: ...
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177 views

/usr/sbin/sendmail: Permission denied

I am trying to setup the mail on my fedora 20. Every time I try to fire a test mail it tells me the permission is denied on /usr/sbin/sendmail. I checked the permissions and this is the output: ...
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61 views

Permission denied when running logrotate with anacron

I am trying to figure out what is causing anacron to send me the following error message: /etc/cron.daily/logrotate: /var/log/mariadb/mariadb.log-20140710.gz: Permission denied error: error running ...
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61 views

Configure vsftpd allow access to mounted ISO file

I am having problems to allow anonymous FTP access to a directory that mounted a ISO file. No change to /etc/vsftpd/vsftpd.conf RHEL 6.5 DVD ISO file saved to /var/ftp/pub/ISO/rhel6_5.iso ...
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83 views

SSH AuthorizedKeysCommand and SELinux

I'm trying to use the SSH AuthorizedKeysCommand in a CentOS 6.5 machine, but I'm encountering an SELinux error. When I switch SELinux to permissive mode - using setenforce 0 - it works, but when I ...
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33 views

Create an RPM to distrubute custom SELinux policy

I have created two custom SELinux Policy modules to allow rsyslog to parse audit.log. Can I create an RPM of these two policies to distribute to 300+ clients? Is there a better way to go about this? ...
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56 views

Does Android's implementation of SELinux's M.A.C. inhibit root apps with root privileges from accessing app data? [closed]

Starting with Android 4.4 SELinux's MAC is enforced. Does this mean that if an app somehow can get installed and exploit the kernel to get root privileges, that MAC will still prevent that app with ...
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After enabling SELinux (permissive mode) on Debian Wheezy, gdm3 does not finish loading

I recently enabled SELinux on my Debian Wheezy system, in permissive mode (I have confirmed that it is indeed operating in permissive mode). However, after the file labelling double-reboot, gdm3 ...
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70 views

What's missing with my SELinux installation?

According to Introduction to SELinux, section 14.4.2, SELinux support is built into the standard kernels provided by Debian. The core Unix tools support SELinux without any modifications. I have ...
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1answer
51 views

SELinux preventing ssh via public key

I have user $USER which is a system user account with an authorized users file. When I have SELinux enabled I am unable to ssh into the server using the public key. If I setenabled 0, $USER can now ...
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56 views

SElinux config file missing

Trying to set up mail I found out I have important file missing or it seems I do. First of all I have no selinux in /etc/sysconfig and in /etc/selinux there is folder mls and files restorecond.conf ...
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182 views

How does SELinux / SEAndroid prevent or allow pseudo terminal allocation?

I'm trying to resolve an SSH connection issue on an Android phone running SELinux in "Enforcing" mode. The problem is that any SSH connection that tries to allocate a pseudo-terminal (/dev/pts etc) is ...
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1answer
119 views

fail2ban permission denied on script

I've just upgraded from RHEL 5 to 6.5 and setup fail2ban anew. I can't seem to get my custom action to work now, supposedly because of a permission issue. I wan't to know what am I doing wrong, and ...
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1answer
55 views

SELlinux security domains

I'm studying SELinux, but I can't find any clear definition for security domains. What is a security domain and what is its difference with security context?
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Are there any recommended SELinux policies for JBOSS?

I’m looking for tips about defining JBoss policies in SELinux. I saw that OWASP is planning to publish a document about this, but I need some guidance ASAP. Can someone please help?
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134 views

Configuring FTP server in redhat

I have installed vsftpd in redhat. Everything was file untill I fould that when I log into ftp server using: ftp localhost or fileZilla I get following errors: ERROR: - 500 OOPS: cannot change ...
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298 views

Samba local master browser cannot be found via broadcast

I have a Samba server (CentOS 6.5, Samba 3.6.9) that acts as a local master browser for a workgroup. I issued $ setenforce 0 $ service iptables stop to disable SELinux and get rid of the firewall. ...
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189 views

Httpd can't access file even after setting httpd_sys_content_t

I'm currently learning SELinux. I was following the instructions in SELinux doc of RedHat. I indeed succeded after typing the following commands: mkdir /mywebsite //add something to ...
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65 views

Is there a selinux, httpd, or PHP configuration that prevents reading mounted drives?

I'm moving a virtualized centos web server over that has an all-to-small hard drive to a new machine and I hooked up a bigger drive for hosting videos and downloads and stuff. W When I try to run a ...
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14 views

Applications running under SELinux that access NonPosix drives

I am looking to use either AppArmor or SELinux. Of what I've seen so far I think I prefer SELinux, but there is one thing that does concern me, that is accessing NonPosix partitions. Let us look at a ...
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44 views

How to do restorecon -f recursively?

I have tried both with a file and using standard input, and it seems it is impossible to get restorecon -r -f [file|-] to do anything at all. Is this possible?
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103 views

SELinux httpd write access to a directory

I am new to SELinux. came from debian. I want to give httpd access to a directory. SELinux Alert Browser suggests: # grep httpd /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp ...
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643 views

Centos 6.5, openvpn port and SElinux

I am configuring an openvpn server on a new centos 6.5. But the main problem is that selinux is blocking openvpn to use the default port tcp 1194. The following is the sealert -a ...
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82 views

Why does the SELinux filesystem have it's own null device?

Looking through /sys/fs/selinux, I found this: # ls -l /sys/fs/selinux/null crw-rw-rw-. 1 root root 1, 3 Jan 24 02:47 /sys/fs/selinux/null Which is identical to /dev/null: # ls -l /dev/null ...
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Using passwordless ssh on CentOS 6

I have a fresh install of CentOS 6 that I am trying to connect to using ssh without a password. But each time I try to login, I am asked for the password. Here are the commands in order: ssh-keygen ...
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2k views

Issues with Fedora 20 and bumblebee

I'm experiencing several issues trying to use my Fedora 20 laptop NVIDIA Optimus technology. My system: ASUS N53S Fedora 20 x86-64 3.12.6-300.fc20.x86_64 Kernel Intel Core i7-2670QM NVIDIA Geforce ...
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65 views

SELinux and Trusted OS - can SELinux be confined to hardware level root?

I am exploring on SE Linux and while doing so i found it as an example of Trusted OS. Is it really an example of Trusted OS stack like TrouSerS ? SELinux as per my understanding modifies the Linux ...
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81 views

What is the difference between lhome and home, and is it causing my SSH key authentication to fail?

I have RHEL running on a system with my account having the root privilege. My home directory is in /lhome/myusername. If I try to add any user their home directory is created in /home/newuser. What ...
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Are there other LSM (Linux Security Modules) in addition to SELinux and AppArmor?

In researching this U&L Q&A titled: permission denied for ptrace under GDB, the question came up, "Is there other software similar to SELinux & AppArmor?". User @IwillnotexistIdonotexist ...
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192 views

Myth or reality: SELinux can confine the root user?

I read or heard somewhere (maybe in LinuxCBT's SELinux course; but I'm not sure) that there are online Linux servers, for which the password of the root user is also given. The Linux server is ...
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687 views

Running Viber as another user while using “mine” X Server's microphine and speakers

I run Fedora with GNOME and recently installed Viber for linux. It's very good and all is working just fine. As Viber is not open-source software, I decided to run it as another user to make sure ...
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Can I stop SElinux from working?

I suspect that SElinux is backdoor and I want to stop it from working on my system. I want to stop it and delete it from the system also if that is possible. Questions How can I delete it without ...
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1answer
824 views

MySQL permission denied error even after setting security context for SELinux on VM

I have MySQL installed on CentOS (detail versions given below). My OS is a VM machine and not a physical machine, the directory /data/mysql is a local disk (virtual). I suspect I might need to do some ...
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Fedora - SELinux - livecd-tools

I'm using livecd-tools to build an image and I am able to consistently build images now, but upon bootup and login, I get "no shell - permission denied". After reading about that error, I saw it is ...
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1answer
166 views

SELinux context of files mounted from a Solaris server

Something I'm attempting to run in RHEL6 fails as a result of SELinux. The problem is temporarily easily solved with "setenforce 0". However turning SELinux off entirely isn't an option in my case. ...
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1answer
835 views

openvpn[]: Options error: In [CMD-LINE]:1: Error opening configuration file

when trying to service openvpn start Oct 12 14:02:01 ccushing1 openvpn[9091]: Options error: In [CMD-LINE]:1: Error opening configuration file: devnet-client-vm.conf running openvpn ...
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78 views

Are there issues concerning trustworthyness of selinux? [closed]

Since selinux is/was? developed by the NSA, and with the current noise around privacy etc concerning said agency, should I be concerned about compromised security on my system?
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578 views

LXC containers as a sandbox environment

I am currently starting a project evaluating untrusted programs (student assignments) in a secure sandbox environment. Main idea is to create a web app for GlassFish and Java wrapper around lxc-utils ...
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What is “ /opt/google/chrome/nacl_helper_bootstrap ”mmap_zero“ access”

I am using Fedora 12 Linux (and, yes, it is soon to be updated), and got the message in the image. My question, please nicely, is what does it mean and what should I do about it? the full text of the ...
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SELinux: allow a process to create any file in a certain directory

I have a script that, when invoked, will cause the contents of dmesg to be written to a file, with the file's name basically being a timestamp. SELinux prevents this. Following the advice of ...
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131 views

SELinux policy to authorize some users to start / stop certain services

How can I give certain users authorization to start and stop certain services? I am asking specifically about Fedora 19 systems with SELinux installed. The utility to call for services administration ...
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421 views

SELinux re-labeling problem while attempting to run OpenVPN

I'm trying to run OpenVPN under Fedora 19 with selinux (selinux-policy-targeted) in enforcing mode, and I'm running into an AVC I'm not entirely sure how to handle. Starting OpenVPN from the command ...
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1k views

What is the safe way to allow Java 7 to run on SELinux

Short version: What is the most secure way to allow Java 7 to run on (with?) SELinux? Long version: Sorry in advance if I use incorrect terminology. I'm really just a Java developer with a meager ...