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Chapter 14. Samba

Samba is an open-source implementation of the Server Message Block (SMB) and Common Internet File System (CIFS) protocols that provides file and print services between clients across various operating systems.[15]
In Red Hat Enterprise Linux, the samba package provides the Samba server. Enter the following command to see if the samba package is installed: 
~]$ rpm -q samba
package samba is not installed
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If it is not installed and you want to use Samba, use the yum utility as the root user to install it: 
~]# yum install samba
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14.1. Samba and SELinux
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When SELinux is enabled, the Samba server (smbd) runs confined by default. Confined services run in their own domains, and are separated from other confined services. The following example demonstrates the smbd process running in its own domain. This example assumes the samba package is installed:
  1. Run the getenforce command to confirm SELinux is running in enforcing mode: 
    ~]$ getenforce
Enforcing
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    The command returns Enforcing when SELinux is running in enforcing mode.
  2. Enter the following command as root to start smbd: 
    ~]# systemctl start smb.service
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    Confirm that the service is running. The output should include the information below (only the time stamp will differ): 
    ~]# systemctl status smb.service
smb.service - Samba SMB Daemon
   Loaded: loaded (/usr/lib/systemd/system/smb.service; disabled)
   Active: active (running) since Mon 2013-08-05 12:17:26 CEST; 2h 22min ago
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  3. To view the smbd processes, execute the following command: 
    ~]$ ps -eZ | grep smb
system_u:system_r:smbd_t:s0      9653 ?        00:00:00 smbd
system_u:system_r:smbd_t:s0      9654?        00:00:00 smbd
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    The SELinux context associated with the smbd processes is system_u:system_r:smbd_t:s0. The second last part of the context, smbd_t, is the type. A type defines a domain for processes and a type for files. In this case, the smbd processes are running in the smbd_t domain.
Files must be labeled correctly to allow smbd to access and share them. For example, smbd can read and write to files labeled with the samba_share_t type, but by default, cannot access files labeled with the httpd_sys_content_t type, which is intended for use by the Apache HTTP Server. Booleans must be enabled to allow certain behavior, such as allowing home directories and NFS volumes to be exported through Samba, as well as to allow Samba to act as a domain controller.

[15] For more information, see the Samba section in the System Administrator's Guide.
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