postfix_p...p_selinux(8)

💅 postfix_p...p_selinux(8) — your girl's guide to the SELinux policy for postfix_pickup

okay so bestie, welcome to the postfix_p...p_selinux(8) manual page — it's the official SELinux Policy postfix_pickup page and I'm about to walk you through every single bit of it, no cap. 🎀

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✨ NAME ✨

postfix_pickup_selinux — the Security Enhanced Linux Policy for the postfix_pickup processes. That's it, that's the whole vibe. 💜

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the postfix_pickup processes via flexible mandatory access control. iconic behaviour, honestly.

The postfix_pickup processes execute with the postfix_pickup_t SELinux type. Wanna check if you've got these processes running? Just run the ps command with the -Z qualifier, like this:

ps -eZ | grep postfix_pickup_t

literally that's it. 🦋

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🚪 ENTRYPOINTS 🚪

The postfix_pickup_t SELinux type can be entered via the postfix_pickup_exec_t file type. that's the door, that's the entry, that's the moment. ✨

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

/usr/libexec/postfix/pickup

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👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. so like, every process gets its own little domain to live in, and honestly? main character energy. 🌈

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

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

The following process types are defined for postfix_pickup:

• postfix_pickup_t

Note: semanage permissive -a postfix_pickup_t can be used to make the process type postfix_pickup_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so it stops blocking you but it still judges you in the logs, lmaooo 💀

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🍓 BOOLEANS 🍓

SELinux policy is customizable based on least access required. postfix_pickup policy is extremely flexible and has several booleans that allow you to manipulate the policy and run postfix_pickup with the tightest access possible. tightest access = cleanest fit, periodt. 💅

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

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📁 MANAGED FILES 📁

The SELinux process type postfix_pickup_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 isn't doing all the work for you, bestie, you still gotta have your permissions right. 🙈

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

postfix_pickup_tmp_t

(no default paths listed for this one — it's giving mysterious, it's giving minimal 🧚)

postfix_var_run_t

/var/spool/postfix/pid/.*

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🗂️ FILE CONTEXTS 🗂️

SELinux requires files to have an extended attribute to define the file type. yes, files have labels now. we love a labelled file. 🏷️

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 postfix_pickup policy is very flexible allowing users to setup their postfix_pickup processes in as secure a method as possible. same energy as before, it's just that good. 🌟

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the postfix_pickup. 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. like so:

semanage fcontext -a -t postfix_pickup_exec_t '/srv/postfix_pickup/content(/.*)?'
restorecon -R -v /srv/mypostfix_pickup_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies stay winning 💖

The following file types are defined for postfix_pickup:

• postfix_pickup_exec_t — Set files with the postfix_pickup_exec_t type, if you want to transition an executable to the postfix_pickup_t domain.
• postfix_pickup_tmp_t — Set files with the postfix_pickup_tmp_t type, if you want to store postfix pickup 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. temporary vs permanent, choose wisely bestie 😭

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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 girlies who like clicking 💅

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🎀 AUTHOR 🎀

This manual page was auto-generated using sepolicy manpage. not me being auto-generated and still serving this hard 😭✨

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🔥 SEE ALSO 🔥

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

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that's the whole page, bestie, every flag and file and boolean accounted for — nothing skipped, nothing invented, no cap 🫶

postfix_pickup — 26-10-06 — postfix_p...p_selinux(8), and that's the sign-off from your favourite SELinux-obsessed gen z menace. go forth and label responsibly 💖🦋🌸