passenger_selinux(8)

✨ passenger_selinux — the SELinux tea for passenger 💅

okay bestie, so this one's the passenger_selinux(8) page from the SELinux policy family, and it's literally all about keeping the passenger processes on a leash. no cap, it's giving "mandatory access control but make it fashion" 🎀

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🦋 NAME

passenger_selinux — the Security Enhanced Linux Policy for the passenger processes, periodt.

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🌸 DESCRIPTION

Security-Enhanced Linux secures the passenger processes via flexible mandatory access control. yes, flexible and mandatory at the same time, she contains multitudes 💜

The passenger processes execute with the passenger_t SELinux type. Wanna check if you've got these processes running? Just run the ps command with the -Z qualifier, easy.

For example:

ps -eZ | grep passenger_t

slay, now you know what's up ✨

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🧚 ENTRYPOINTS

The passenger_t SELinux type can be entered via the passenger_exec_t file type — that's the doorway, iykyk 🚪

The default entrypoint paths for the passenger_t domain are the following, and yes you're getting all of them:

/usr/share/.*/gems/.*/helper-scripts/prespawn,
/usr/lib/gems/.*/Passenger.*,
/usr/lib/gems/.*/ApplicationPoolServerExecutable,
/usr/share/gems/.*/Passenger.*,
/usr/share/gems/.*/ApplicationPoolServerExecutable

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👑 PROCESS TYPES

SELinux defines process types (domains) for each process running on the system. main character energy for every single process, 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 passenger policy is very flexible, allowing users to set up their passenger processes in as secure a method as possible. secure AND flexible, she ate 🔥

The following process types are defined for passenger:

• passenger_t

💀 Note: semanage permissive -a passenger_t can be used to make the process type passenger_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, she's not blocking you, but she IS still writing it all down in her notes 📝

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🌈 BOOLEANS

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

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 Apache to run in stickshift mode, not transition to passenger, you must turn on the httpd_run_stickshift boolean. Disabled by default.

setsebool -P httpd_run_stickshift 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 passenger_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. and just a lil heads up: the processes UID still need to have DAC permissions, no skipping that step bestie 🙈

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

passenger_log_t

/var/log/passenger.*

passenger_tmp_t

(no extra default paths listed for this one, she's mysterious like that 🦋)

passenger_var_lib_t

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

passenger_var_run_t

/run/passenger(/.*)?

puppet_var_lib_t

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

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🎀 FILE CONTEXTS

SELinux requires files to have an extended attribute to define the file type. it's like a name tag but for files, iconic.

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 passenger policy is very flexible, allowing users to set up their passenger processes in as secure a method as possible. yeah she said it twice, because it's that serious 💅

📁 STANDARD FILE CONTEXT

SELinux defines the file context types for the passenger, so 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-step process, no shortcuts, fr fr:

semanage fcontext -a -t passenger_exec_t '/srv/passenger/content(/.*)?'
restorecon -R -v /srv/mypassenger_content

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

The following file types are defined for passenger:

passenger_exec_t

• Set files with the passenger_exec_t type if you want to transition an executable to the passenger_t domain.

Paths:

/usr/share/.*/gems/.*/helper-scripts/prespawn,
/usr/lib/gems/.*/Passenger.*,
/usr/lib/gems/.*/ApplicationPoolServerExecutable,
/usr/share/gems/.*/Passenger.*,
/usr/share/gems/.*/ApplicationPoolServerExecutable

passenger_log_t

• Set files with the passenger_log_t type if you want to treat the data as passenger log data, usually stored under the /var/log directory.

passenger_tmp_t

• Set files with the passenger_tmp_t type if you want to store passenger temporary files in the /tmp directories.

passenger_var_lib_t

• Set files with the passenger_var_lib_t type if you want to store the passenger files under the /var/lib directory.

passenger_var_run_t

• Set files with the passenger_var_run_t type if you want to store the passenger files under the /run or /var/run directory.

💀 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, which will modify the SELinux labeling database. You will need to use restorecon to apply the labels. temporary vs permanent, know the difference bestie 😭

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⭐ COMMANDS

伟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 whole GUI, for the visual learners 🖥️✨

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💜 AUTHOR

This manual page was auto-generated using sepolicy manpage. (yes, the manpage has a manpage generator, we love a self-sufficient queen 👑)

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🌟 SEE ALSO

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

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okay that's the whole thing, bestie, you're officially caught up 🫶 this cutie was brought to you by passenger, dated 26-10-06, straight from passenger_selinux(8) — go forth and label responsibly 💖