gssd_selinux(8)

💅 gssd_selinux(8) — the SELinux Policy page for gssd, but make it make sense

okay bestie, this is gssd_selinux(8) from the SELinux Policy gssd manual, and it's literally all about how SELinux keeps the gssd processes on a leash. let's get into it 🎀

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✨ NAME ✨

gssd_selinux — the Security Enhanced Linux Policy for the gssd processes. that's it, that's the whole name. iconic.

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🌸 DESCRIPTION 🌸

so, Security-Enhanced Linux secures the gssd processes via flexible mandatory access control. yeah. mandatory. it's not asking, it's telling. 💅

the gssd processes execute with the gssd_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 gssd_t

run that and see what's vibing. 🦋

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🦋 ENTRYPOINTS 🦋

the gssd_t SELinux type can be entered via the gssd_exec_t file type. like, that's the door. 🚪✨

the default entrypoint paths for the gssd_t domain are the following:

/usr/bin/rpc.gssd, /usr/bin/rpc.svcgssd

those two. no cap.

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👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. every process gets its own little domain, it's giving main character energy for everyone honestly.

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

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

the following process types are defined for gssd:

• gssd_t

note: semanage permissive -a gssd_t can be used to make the process type gssd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it stops yelling at you but it's still writing it down. 😭

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🔥 BOOLEANS 🔥

SELinux policy is customizable based on least access required. gssd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run gssd with the tightest access possible. tightest access, bestie. we love a locked-down queen. 🔒

if you want to allow gssd to list tmp directories and read the kerberos credential cache, you must turn on the gssd_read_tmp boolean. Enabled by default.

setsebool -P gssd_read_tmp 1

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 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. 👀 (yes, you gotta turn this one on yourself)

setsebool -P nis_enabled 1

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💜 MANAGED FILES 💜

the SELinux process type gssd_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. SELinux said "i'll handle my part, you handle yours." 🤝

• auth_cache_t

/var/cache/coolkey(/.*)?

• cluster_conf_t

/etc/cluster(/.*)?

• cluster_var_lib_t

/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

/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

• gssd_tmp_t

(no default paths listed for this one — it is what it is 💀)

• krb5_host_rcache_t

/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

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

• security_t

/selinux

• user_tmp_t

/run/tlog(/.*)?
/run/user/[^/]+
/dev/shm/mono.*
/tmp/.ICE-unix(/.*)?
/tmp/.X11-unix(/.*)?
/dev/shm/pulse-shm.*
/run/user
/tmp/.X0-lock
/tmp/hsperfdata_root
/var/tmp/hsperfdata_root
/home/[^/]+/tmp
/home/[^/]+/.tmp
/run/user/[0-9]+
/tmp/gconfd-[^/]+

• var_lib_nfs_t

/var/lib/nfs(/.*)?

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🧚 FILE CONTEXTS 🧚

SELinux requires files to have an extended attribute to define the file type. yes, every file's got a little label telling everyone who it is. 🏷️

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 gssd policy is very flexible, allowing users to setup their gssd processes in as secure a method as possible. (yes, it says that twice in this page. we're consistent. 💅)

🌈 STANDARD FILE CONTEXT 🌈

SELinux defines the file context types for the gssd. 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. ok so: relabel the rule first, then actually apply it. in that order, bestie. ✨

semanage fcontext -a -t gssd_exec_t '/srv/gssd/content(/.*)?'
restorecon -R -v /srv/mygssd_content

note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise. 🫶

the following file types are defined for gssd:

• gssd_exec_t — set files with the gssd_exec_t type if you want to transition an executable to the gssd_t domain.

Paths:

/usr/bin/rpc.gssd, /usr/bin/rpc.svcgssd

• gssd_keytab_t — set files with the gssd_keytab_t type if you want to treat the files as kerberos keytab files. 🔑
• gssd_tmp_t — set files with the gssd_tmp_t type if you want to store gssd 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. so like chcon is the fling, semanage fcontext + restorecon is the whole relationship. 💀

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⭐ 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 boolean can also be used to manipulate the booleans.
• system-config-selinux is a GUI tool available to customize SELinux policy settings. (a GUI!! for the ones who don't live in the terminal. we respect it.) 🖱️✨

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🍓 AUTHOR 🍓

this manual page was auto-generated using sepolicy manpage. no human wrote this, a script did, and honestly? it ate. 🤖💅

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🌈 SEE ALSO 🌈

selinux(8), gssd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

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and that's the whole page bestie!! 💖 this one's gssd from 26-10-06, rendered as gssd_selinux(8) — go forth and label responsibly. 🎀🦋🌸