Skip to main content

Using samba 3.6 with RHEL 6 and SELinux (OBSOLETE)

Update 2: No, it doesn't work with sernet samba, but I'll look at where it fails; perhaps I need a relabel.

Update 1: This used to be a problem when RHEL 6 came out. They have since updated the samba policies and it now works out of the box.

I have a default installation of RHEL 6, yet want to use samba 3.6 from sernet on it. This doesn't work -- nmbd gets killed by the samba selinux policy installed on RHEL 6.

A simple workaround is to change the smbd_t policy to permissive, this way you can investigate and create an additional policy module to fix it (admittedly I never bothered, RedHat fixed their policy to work with samba 3.6).

semodule -d sambagui
semanage permissive -a smbd_t
semanage permissive -a nmbd_t
semodule -l | grep '[sn]mb'
# should show permissive_[sn]mbd_t...

A somewhat more overreaching, and thus not recommended, workaround was to disable the samba policy modules:

# semodule -d sambagui
# semodule -d samba
# semodule -l | grep samba
# should show sambagui and samba as Disabled

As a reference, Dan Walsh's blog entry may be one of the references for writing selinux policy modules.

The audit.log entry looks like following:

avc:  denied  { create } for  pid=3815 comm="nmbd" name="unexpected" scontext=unconfined_u:system_r:nmbd_t:s0 tcontext=unconfined_u:object_r:samba_var_t:s0 tclass=sock_file

Comments

Popular posts from this blog

Both INCLUDEPATH and DEPENDPATH are usually needed in qmake .pro project files.

qmake, the build tool provided with the Qt toolkit, converts project files written in its own mini-language to platform-specific Makefiles.

This process includes adding necessary dependencies to the Makefile, so that changes in source files trigger rebuilding of the outputs that depend on said sources.

If your project is spread across directories, you'll likely add an INCLUDEPATH line to your .pro file so that the #include directives look sane -- say #include "library/foo.h" instead of #include "../library/foo.h". This can be done by adding INCLUDEPATH += "../" to the .pro project file.

This, by itself, doesn't cause the files in include directories to be treated as dependencies. This is a sane default, since you likely don't want to rebuild your whole project if a system library changes -- assuming, of course, that the library is meant to stay binary compatible between releases!

Thus, if any of your source files references a file from somewhe…

Asterisk 1.8 with SELinux on RHEL 6 / CentOS 6

Asterisk 1.8 is the current long term support (LTS) version of Asterisk. You can find it in the atrpms repository. Using atrpms requires a bit of ingenuity, since you must enable yum priorities. Here's how I've set up my yum priorities and excludes to play well with RHEL (lower priority is higher):

# /etc/yum/pluginconf.d/rhnplugin.conf
priority = 9

# files in /etc/yum/repos.d - current samba and subversion override those of RHEL
sernet-samba - 5
wandisco - 6
rhnplugin - 9
centos-base - 20, includepkgs=xfs* fftw-* glpk-* dell-firmware-repository - 30 dell-omsa-repository - 30 rpmforge-repo - 50, exclude=hdf5*
epel - 60, exclude=dahdi* atrpms - 70
I'm using a bunch of non-redhat packages, including Asterisk, recent subversion, octave, xfs tools, and Dell server management tools.

For Asterisk proper, I'm running an AGI caller id script, and a fax receiving script. The fax script uses cups to print. Those scripts require exceptions to the targeted SELinux policy. Note that the polic…

Details of Migrating Zimbra 6 to Zimbra 8

I have a small Zimbra system that needed to be migrated from 6.0 to 8.0. Generally:
You must update to 6.0.16 on the source system. The account export functionality is broken in versions prior to 6.0.15 and will fail on some accounts.Start with a fresh 8.0 install. On a small system (dozens of users), that seems like the simplest option.Keep the 6.0 system running. Use the migration wizard in 8.0's admin console (Tools & Migration -> Account Migration) to move over account records only.
Set "type of mail server" to Zimbra Collaboration Suite. Set "would you like to import mail" to No.Import from another Zimbra LDAP directory.Set the LDAP Search Base to "dc=foo,dc=com" where foo.com would be your domain. This saves work on manually moving accounts between systems.
To move account contents and filter settings between servers, you can do the following on the source server:
su - zimbra
ACCT=user@foo.com      # account to move
DEST=root@destination  # ss…