portmap_selinux(8)

💅 portmap_selinux(8) — the portmap SELinux glow-up guide

okay so bestie, this is the manual page for portmap_selinux, and honestly it's giving "niche but essential." let's get into it ✨

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🌸 NAME

portmap_selinux — the Security Enhanced Linux policy for the portmap processes. that's it, that's the name, and yes it ate. 👑

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🦋 DESCRIPTION

so, Security-Enhanced Linux secures the portmap processes via flexible mandatory access control. flexible and mandatory, we contain multitudes 💅

the portmap processes execute with the portmap_t SELinux type. wanna check if you've got these processes running? just execute the ps command with the -Z qualifier. for example:

ps -eZ | grep portmap_t

lowkey the easiest vibe check ever. 🫶

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🎀 ENTRYPOINTS

the portmap_t SELinux type can be entered via the portmap_exec_t file type. that's the doorway, that's the entrance, that's the main character portal.

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

/usr/bin/portmap

one path. iconic, honestly. ✨

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🔥 PROCESS TYPES

SELinux defines process types (domains) for each process running on the system. yes, every single one gets a little label. it's giving name tags at a party 🎀

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

policy governs the access confined processes have to files. SELinux portmap policy is very flexible, allowing users to set up their portmap processes in as secure a method as possible. highkey obsessed with the flexibility ngl.

the following process types are defined for portmap:

• portmap_t
• portmap_helper_t

Note: semanage permissive -a portmap_t can be used to make the process type portmap_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it stops blocking you but it's still gonna talk about you behind your back 😭

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💜 BOOLEANS

SELinux policy is customizable based on least access required. portmap policy is extremely flexible and has several booleans that allow you to manipulate the policy and run portmap with the tightest access possible. tightest access = the most locked-down 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

three booleans, three little switches for your soul 🦋

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🍓 PORT TYPES

SELinux defines port types to represent TCP and UDP ports. yes, ports have types too, everyone gets a type, it's a whole thing.

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 portmap policy is very flexible, allowing users to set up their portmap processes in as secure a method as possible. (she says it every time and honestly? consistency is key 💅)

the following port types are defined for portmap:

• portmap_port_t

Default Defined Ports:

tcp 111
udp 111

port 111 twice, because tcp and udp both deserve representation 🌈

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🧚 MANAGED FILES

the SELinux process type portmap_t can manage files labeled with the following file types. the paths listed are the default paths for these file types. note: the process's UID still needs to have DAC permissions. SELinux can't save you from plain old Unix permissions, sorry bestie 🙈

• 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

• 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

• portmap_tmp_t — no default paths listed, she's mysterious like that 💀
• portmap_var_run_t

/run/portmap_mapping
/run/portmap.upgrade-state

• root_t

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

that's a whole lot of paths but we read every single one, no skimming in this house 🫶

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⭐ FILE CONTEXTS

SELinux requires files to have an extended attribute to define the file type. little label, big responsibility.

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 portmap policy is very flexible, allowing users to set up their portmap processes in as secure a method as possible.

🌷 STANDARD FILE CONTEXT

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

semanage fcontext -a -t portmap_exec_t '/srv/portmap/content(/.*)?'
restorecon -R -v /srv/myportmap_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. regex my beloved 🎀

the following file types are defined for portmap:

• portmap_exec_t — set files with the portmap_exec_t type if you want to transition an executable to the portmap_t domain.
• portmap_helper_exec_t — set files with the portmap_helper_exec_t type if you want to transition an executable to the portmap_helper_t domain.

Paths:

/usr/bin/pmap_set, /usr/bin/pmap_dump

• portmap_initrc_exec_t — set files with the portmap_initrc_exec_t type if you want to transition an executable to the portmap_initrc_t domain.
• portmap_tmp_t — set files with the portmap_tmp_t type if you want to store portmap temporary files in the /tmp directories.
• portmap_var_run_t — set files with the portmap_var_run_t type if you want to store the portmap files under the /run or /var/run directory.

Paths:

/run/portmap_mapping, /run/portmap.upgrade-state

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. temporary vs permanent, know the difference bestie, it'll save you a whole crisis 😭

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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 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. yes, a GUI, for when the terminal is not the vibe ✨

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🫶 AUTHOR

this manual page was auto-generated using sepolicy manpage. a bot wrote this and honestly? it ate. 💅

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👑 SEE ALSO

selinux(8), portmap(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8), portmap_helper_selinux(8), portmap_helper_selinux(8)

(yes, portmap_helper_selinux(8) is listed twice — she said "you WILL read me" and honestly, respect 💀)

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and that's the whole page, bestie! 🎀 this one lives in the portmap section, dated 26-10-06, and it's the portmap_selinux(8) page. go forth and label responsibly — mwah 💖🌸🦋