dccm_selinux(8)

🎀 NAME 🎀

dccm_selinux — Security Enhanced Linux Policy for the dccm processes. Bestie, this is the dccm_selinux(8) page, and it’s literally all about the SELinux policy vibe for dccm. 💅✨

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the dccm processes via flexible mandatory access control. No cap.

The dccm processes execute with the dccm_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 dccm_t

🦋 ENTRYPOINTS 🦋

The dccm_t SELinux type can be entered via the dccm_exec_t file type. 🫶

The default entrypoint paths for the dccm_t domain are the following:

/usr/bin/dccm, /usr/libexec/dcc/dccm

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system.

You can see the context of a process using the -Z option to ps.

Policy governs the access confined processes have to files. SELinux dccm policy is very flexible, allowing users to setup their dccm processes in as secure a method as possible. 🔥

The following process types are defined for dccm:

• dccm_t

Note: semanage permissive -a dccm_t can be used to make the process type dccm_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. 💀

✨ BOOLEANS ✨

SELinux policy is customizable based on least access required. The dccm policy is extremely flexible and has several booleans that allow you to manipulate the policy and run dccm with the tightest access possible. Slay.

If you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on the daemons_dontaudit_scheduling boolean. Enabled by default.

setsebool -P daemons_dontaudit_scheduling 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 system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.

setsebool -P nis_enabled 1

🌈 PORT TYPES 🌈

SELinux defines port types to represent TCP and UDP ports.

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 dccm policy is very flexible, allowing users to setup their dccm processes in as secure a method as possible. 💖

The following port types are defined for dccm:

• dccm_port_t

Default Defined Ports:

tcp 5679
udp 5679

🧚 MANAGED FILES 🧚

The SELinux process type dccm_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. 🔑

• cluster_conf_t — default path:

/etc/cluster(/.*)?

• cluster_var_lib_t — default paths:

/var/lib/pcsd(/.*)?
/var/lib/cluster(/.*)?
/var/lib/openais(/.*)?
/var/lib/pengine(/.*)?
/var/lib/corosync(/.*)?
/usr/lib/heartbeat(/.*)?
/var/lib/heartbeat(/.*)?
/var/lib/pacemaker(/.*)?

• cluster_var_run_t — default paths:

/run/crm(/.*)?
/run/cman_.*
/run/rsctmp(/.*)?
/run/aisexec.*
/run/heartbeat(/.*)?
/run/pcsd-ruby.socket
/run/corosync-qnetd(/.*)?
/run/corosync-qdevice(/.*)?
/run/pcsd.socket
/run/corosync.pid
/run/cpglockd.pid
/run/rgmanager.pid
/run/cluster/rgmanager.sk

• dcc_client_map_t — default paths:

/etc/dcc/map
/run/dcc/map
/var/dcc/map
/var/lib/dcc/map

• dcc_var_t — default paths:

/etc/dcc(/.*)?
/var/dcc(/.*)?
/var/lib/dcc(/.*)?

• dccm_tmp_t
• dccm_var_run_t
• krb5_host_rcache_t — default paths:

/var/tmp/krb5_0.rcache2
/var/cache/krb5rcache(/.*)?
/var/tmp/nfs_0
/var/tmp/DNS_25
/var/tmp/host_0
/var/tmp/imap_0
/var/tmp/HTTP_23
/var/tmp/HTTP_48
/var/tmp/ldap_55
/var/tmp/ldap_487
/var/tmp/ldapmap1_0

• root_t — default paths:

/sysroot/.aleph-version.json
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
/var/lib/ntp

🎀 FILE CONTEXTS 🎀

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls.

Policy governs the access confined processes have to these files. SELinux dccm policy is very flexible, allowing users to setup their dccm processes in as secure a method as possible. 💅

🍓 STANDARD FILE CONTEXT 🍓

SELinux defines the file context types for the dccm, if you wanted to store files with these types in a different paths, you need to execute the semanage command to specify alternate labeling and then use restorecon to put the labels on disk.

semanage fcontext -a -t dccm_exec_t '/srv/dccm/content(/.*)?'
restorecon -R -v /srv/mydccm_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. 🧚

The following file types are defined for dccm:

• dccm_exec_t — Set files with the dccm_exec_t type, if you want to transition an executable to the dccm_t domain.

Paths:

/usr/bin/dccm, /usr/libexec/dcc/dccm

• dccm_tmp_t — Set files with the dccm_tmp_t type, if you want to store dccm temporary files in the /tmp directories.
• dccm_var_run_t — Set files with the dccm_var_run_t type, if you want to store the dccm files under the /run or /var/run directory.

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. 😭

🛠️ COMMANDS 🛠️

• semanage fcontext can also be used to manipulate default file context mappings.
• 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.

💜 AUTHOR 💜

This manual page was auto-generated using sepolicy manpage .

🫶 SEE ALSO 🫶

• selinux(8)
• dccm(8)
• semanage(8)
• restorecon(8)
• chcon(1)
• sepolicy(8)
• setsebool(8)

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Original footer sign-off: source/version dccm, date 26-10-06, manual page dccm_selinux(8). That’s the whole page, bestie — periodt. 💖✨🫶