postfix_b...e_selinux(8)

🦋 postfix_bounce_selinux(8) — the glow-up guide 💖

okay bestie, welcome to postfix_bounce_selinux(8) — it's the SELinux policy page for postfix_bounce, and it's honestly giving "quiet little manpage that runs the whole show". grab a strawberry drink 🍓 and let's go.

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✨ NAME ✨

postfix_bounce_selinux — the Security Enhanced Linux Policy for the postfix_bounce processes. that's it, that's the name, she's iconic 💅

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the postfix_bounce processes via flexible mandatory access control. lowkey the whole point of SELinux tbh.

The postfix_bounce processes execute with the postfix_bounce_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 postfix_bounce_t

go on, run it, vibe check your processes 👑

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🎀 ENTRYPOINTS 🎀

The postfix_bounce_t SELinux type can be entered via the postfix_bounce_exec_t file type.

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

/usr/libexec/postfix/bounce

that's the door, that's the only door 🚪✨

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

The following process types are defined for postfix_bounce:

• postfix_bounce_t

Note: semanage permissive -a postfix_bounce_t can be used to make the process type postfix_bounce_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, she won't block you, but she WILL be taking notes 📝💀

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🌈 BOOLEANS 🌈

SELinux policy is customizable based on least access required. postfix_bounce policy is extremely flexible and has several booleans that allow you to manipulate the policy and run postfix_bounce with the tightest access possible. no cap, tightest access is the aesthetic 🫶

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_bounce_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. (yes, SELinux said no gatekeeping the DAC rules, those still apply fr fr.)

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_bounce_tmp_t

(no default paths listed — she's a mystery, we love that for her 🔥)

postfix_spool_bounce_t

/var/spool/postfix/bounce(/.*)?

postfix_spool_t

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

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.

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the postfix_bounce. 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 postfix_bounce_exec_t '/srv/postfix_bounce/content(/.*)?'
restorecon -R -v /srv/mypostfix_bounce_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_bounce:

• postfix_bounce_exec_t — Set files with the postfix_bounce_exec_t type, if you want to transition an executable to the postfix_bounce_t domain.
• postfix_bounce_tmp_t — Set files with the postfix_bounce_tmp_t type, if you want to store postfix bounce 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 is literally the whole plot 😭

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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. yes bestie, there's a GUI, you don't have to raw-dog the terminal every time 🖱️✨

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👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage. not me being written by a script and still serving 💅

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🌟 SEE ALSO 🌟

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

go read those too, iykyk 📚🫶

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and that's the whole page, bestie! this one's from postfix_bounce, dated 26-10-06, and it lives under postfix_b...e_selinux(8) — slay, go forth and label responsibly 💖🎀🦋