postfix_..._selinux(8)

✨ postfix_postdrop_selinux ✨

okay bestie, so this is the manual page for postfix_..._selinux (iykyk 😅) and it's literally all about the SELinux policy for postfix_postdrop. buckle up, we're getting into it 💅

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🌸 NAME 🌸

postfix_postdrop_selinux — the Security Enhanced Linux Policy for the postfix_postdrop processes, periodt 👑

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🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the postfix_postdrop processes via flexible mandatory access control. no cap, that's the whole vibe — it's like a bouncer for your processes but make it ✨ secure ✨

The postfix_postdrop processes execute with the postfix_postdrop_t SELinux type. you can check if you have these processes running by executing the ps command with the -Z qualifier. like, for example:

ps -eZ | grep postfix_postdrop_t

go off, ps 💖

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🎀 ENTRYPOINTS 🎀

The postfix_postdrop_t SELinux type can be entered via the postfix_postdrop_exec_t file type. it's giving "this is the doorway, bestie" 🚪

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

/usr/bin/postdrop

that's the one and only, literally 🫶

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🔥 PROCESS TYPES 🔥

SELinux defines process types (domains) for each process running on the system. iconic behavior, honestly.

You can see the context of a process using the -Z option to ps. love that for you 👀

Policy governs the access confined processes have to files. the SELinux postfix_postdrop policy is very flexible, allowing users to setup their postfix_postdrop processes in as secure a method as possible. flexible AND secure? main character energy fr fr ✨

The following process types are defined for postfix_postdrop:

• postfix_postdrop_t — the one, the only, the domain 💜

Note: semanage permissive -a postfix_postdrop_t can be used to make the process type postfix_postdrop_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so it's like, you're not blocked, but you're still being watched 👁️👁️

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🍓 BOOLEANS 🍓

SELinux policy is customizable based on least access required. the postfix_postdrop policy is extremely flexible and has several booleans that allow you to manipulate the policy and run postfix_postdrop with the tightest access possible. slay, customization 💅

If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default. it's already on, no need to touch it bestie 😌

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. so you gotta flip it on if you want it 👇

setsebool -P nis_enabled 1

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🌈 MANAGED FILES 🌈

The SELinux process type postfix_postdrop_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. so like, SELinux says yes but DAC might still say no, know what I'm saying 🤷‍♀️

• arpwatch_tmp_t — no paths listed for this one, it's mysterious like that 🕵️‍♀️
• krb5_host_rcache_t — here's where it lives:

/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_spool_t — the postfix spool zone, iconic:

/var/spool/postfix.*
/var/spool/postfix/defer(/.*)?
/var/spool/postfix/flush(/.*)?
/var/spool/postfix/deferred(/.*)?
/var/spool/postfix/maildrop(/.*)?

• postfix_var_run_t — the pid vibes:

/var/spool/postfix/pid/.*

• uucpd_spool_t — uucp spools, retro but valid:

/var/spool/uucp(/.*)?
/var/spool/uucppublic(/.*)?

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💀 FILE CONTEXTS 💀

SELinux requires files to have an extended attribute to define the file type. it's like every file needs its little name tag, adorable 🏷️

You can see the context of a file using the -Z option to ls. peek at those labels bestie 👀

Policy governs the access confined processes have to these files. the SELinux postfix_postdrop policy is very flexible, allowing users to setup their postfix_postdrop processes in as secure a method as possible. we love a flexible queen 💖

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the postfix_postdrop. 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. here's the whole procedure, bestie:

semanage fcontext -a -t postfix_postdrop_exec_t '/srv/postfix_postdrop/content(/.*)?'
restorecon -R -v /srv/mypostfix_postdrop_content

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

The following file types are defined for postfix_postdrop:

• postfix_postdrop_exec_t — Set files with the postfix_postdrop_exec_t type, if you want to transition an executable to the postfix_postdrop_t domain. this is the exec label, the gateway to the domain, the moment before the transition ✨

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 chcon is the quick fix, semanage fcontext + restorecon is the glow-up that lasts 💅

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🙈 COMMANDS 🙈

semange fcontext can also be used to manipulate default file context mappings. (yes bestie, we see the typo in the original, it's semanage but we're keeping the energy, moving on 😭)

semange permissive can also be used to manipulate whether or not a process type is permissive.

semange module can also be used to enable/disable/install/remove policy modules.

semange boolean can also be used to manipulate the booleans.

system-config-selinux is a GUI tool available to customize SELinux policy settings. point and click, no terminal required, we love accessibility 🖱️✨

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🧚 AUTHOR 🧚

This manual page was auto-generated using sepolicy manpage. the robots did this one, we're just vibing with it 🤖💜

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👑 SEE ALSO 👑

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

go read these next, bestie, i believe in you 📚✨

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and that's the whole page! this beauty is from source postfix_postdrop, dated 26-10-06, and it's the postfix_..._selinux(8) manual — go forth and secure those processes, queen 💖🎀🦋👑