Security-Enhanced Linux secures the irc processes via flexible mandatory access control.
The irc processes execute with the irc_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
For example:
ps -eZ | grep irc_t
The irc_t SELinux type can be entered via the irc_exec_t file type.
The default entrypoint paths for the irc_t domain are the following:
/usr/bin/[st]irc, /usr/bin/ircII, /usr/bin/irssi, /usr/bin/tinyirc
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux irc policy is very flexible allowing users to setup their irc processes in as secure a method as possible.
The following process types are defined for irc:
irc_t
Note: semanage permissive -a irc_t can be used to make the process type irc_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
If you want to determine whether irc clients can listen on and connect to any unreserved TCP ports, you must turn on the irc_use_any_tcp_ports boolean. Disabled by default.
setsebool -P irc_use_any_tcp_ports 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
You can see the types associated with a port by using the following command:
semanage port -l
Policy governs the access confined processes have to these ports. SELinux irc policy is very flexible allowing users to setup their irc processes in as secure a method as possible.
The following port types are defined for irc:
Default Defined Ports: tcp 6667,6697
The SELinux process type irc_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.
cifs_t
ecryptfs_t
/home/[^/]+/.Private(/.*)?
/home/[^/]+/.ecryptfs(/.*)?
fusefs_t
/var/run/user/[^/]*/gvfs
irc_home_t
/home/[^/]+/.irssi(/.*)?
/home/[^/]+/irclog(/.*)?
/home/[^/]+/.ircmotd
irc_tmp_t
nfs_t
user_home_t
/home/[^/]+/.+
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux irc policy is very flexible allowing users to setup their irc processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the irc, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t irc_tmp_t '/srv/myirc_content(/.*)?'
restorecon -R -v /srv/myirc_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for irc:
irc_conf_t
- Set files with the irc_conf_t type, if you want to treat the files as irc configuration data, usually stored under the /etc directory.
irc_exec_t
- Set files with the irc_exec_t type, if you want to transition an executable to the irc_t domain.
irc_home_t
- Set files with the irc_home_t type, if you want to store irc files in the users home directory.
irc_tmp_t
- Set files with the irc_tmp_t type, if you want to store irc temporary files in the /tmp directories.
Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.
semanage permissive can also be used to manipulate whether or not a process type is permissive.
semanage module can also be used to enable/disable/install/remove policy modules.
semanage port can also be used to manipulate the port definitions
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.