squid_selinux(8)

📦
version 20250627+git412.dbf877ab7 · 7 versions
, in opensuse-leap 16.0

💅 squid_selinux(8) — the SELinux Policy for squid, bestie edition 🦑

So like... this is squid_selinux(8), which lives in the SELinux Policy squid section of the manual. It's the whole rundown on how SELinux keeps the squid processes on a leash. Obsessed, honestly. ✨

🌸 NAME 🌸

squid_selinux — Security Enhanced Linux Policy for the squid processes. That's it, that's the whole vibe. 💖

✨ DESCRIPTION ✨

Security-Enhanced Linux secures the squid processes via flexible mandatory access control. Lowkey the whole point. 🔥

Your squid processes run with the squid_t SELinux type. Want to check if you've got these processes running? Just run the ps command with the -Z qualifier, no cap.

For example:

ps -eZ | grep squid_t

That's it. That's the vibe check. 🫶

🚪 ENTRYPOINTS 🚪

You can enter the squid_t SELinux type through the squid_exec_t file type. It's giving exclusive club, one door. 🎀

The default entrypoint paths for the squid_t domain are literally these:

/usr/bin/squid, /usr/libexec/squid/cache_swap.sh

👑 PROCESS TYPES 👑

SELinux defines process types (aka domains) for each process running on the system. Every process gets its own little identity, iconic behavior honestly.

You can see the context of a process using the -Z option to ps. Go look, it's fun.

Policy governs the access confined processes have to files. SELinux squid policy is very flexible, allowing users to set up their squid processes in as secure a method as possible. 💜

The following process types are defined for squid:

squid_t, squid_cron_t, squid_script_t

Note: semanage permissive -a squid_t can be used to make the process type squid_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. So like... it stops yelling at you but it's still journaling about it. 🙈

🔘 BOOLEANS 🔘

SELinux policy is customizable based on least access required. squid policy is extremely flexible and has several booleans that allow you to manipulate the policy and run squid with the tightest access possible. We love a configurable queen. 👑

If you want to determine whether squid should have access to snmp port, you must turn on the squid_bind_snmp_port boolean. Disabled by default.

setsebool -P squid_bind_snmp_port 1

If you want to determine whether squid can connect to all TCP ports, you must turn on the squid_connect_any boolean. Disabled by default.

setsebool -P squid_connect_any 1

If you want to determine whether squid can run as a transparent proxy, you must turn on the squid_use_tproxy boolean. Disabled by default.

setsebool -P squid_use_tproxy 1

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 confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.

setsebool -P kerberos_enabled 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

🔌 PORT TYPES 🔌

SELinux defines port types to represent TCP and UDP ports. Yes bestie, ports get types too. ✨

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

The following port types are defined for squid:

squid_port_t

Default Defined Ports:

tcp 3128,3401,4827
udp 3401,4827

📁 MANAGED FILES 📁

The SELinux process type squid_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Just remember: the processes UID still needs to have DAC permissions. SELinux isn't doing everything for you, 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

faillog_t

/var/log/btmp.*
/run/faillock(/.*)?
/var/log/faillog.*
/var/log/tallylog.*

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

root_t

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

security_t

/selinux

squid_cache_t

/var/lib/ssl_db(/.*)?
/var/lightsquid(/.*)?
/var/squidGuard(/.*)?
/var/cache/squid(/.*)?
/var/spool/squid(/.*)?
/etc/squid/ssl_db(/.*)?

squid_log_t

/var/log/squid(/.*)?
/var/log/squidGuard(/.*)?

squid_tmp_t

(no default paths listed, she's mysterious like that) 💅

squid_tmpfs_t

/dev/shm/squid-*

squid_var_run_t

/run/squid.*

🗂️ FILE CONTEXTS 🗂️

SELinux requires files to have an extended attribute to define the file type. Every file needs its little name tag, honestly relatable.

You can see the context of a file using the -Z option to ls. Go check your files' outfits. 🎀

Policy governs the access confined processes have to these files. SELinux squid policy is very flexible, allowing users to set up their squid processes in as secure a method as possible. 🦋

🌀 EQUIVALENCE DIRECTORIES 🌀

squid policy stores data with multiple different file context types under the /var/log/squid directory. If you'd like to store the data in a different directory, you can use the semanage command to create an equivalence mapping. Say you wanted to store this data under the /srv directory — you'd execute the following command:

semanage fcontext -a -e /var/log/squid /srv/squid
restorecon -R -v /srv/squid

Slay. Now /srv/squid gets the same treatment. ✨

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for squid. 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.

semanage fcontext -a -t squid_exec_t '/srv/squid/content(/.*)?'
restorecon -R -v /srv/mysquid_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 squid:

squid_cache_t

  • Set files with the squid_cache_t type if you want to store the files under the /var/cache directory.

Paths:

/var/lib/ssl_db(/.*)?, /var/lightsquid(/.*)?,
/var/squidGuard(/.*)?, /var/cache/squid(/.*)?,
/var/spool/squid(/.*)?, /etc/squid/ssl_db(/.*)?

squid_conf_t

  • Set files with the squid_conf_t type if you want to treat the files as squid configuration data, usually stored under the /etc directory.

Paths:

/etc/squid(/.*)?, /etc/lightsquid(/.*)?, /usr/share/squid(/.*)?

squid_content_t

  • Set files with the squid_content_t type if you want to treat the files as squid content.

squid_cron_exec_t

  • Set files with the squid_cron_exec_t type if you want to transition an executable to the squid_cron_t domain.

squid_exec_t

  • Set files with the squid_exec_t type if you want to transition an executable to the squid_t domain.

Paths:

/usr/bin/squid, /usr/libexec/squid/cache_swap.sh

squid_htaccess_t

  • Set files with the squid_htaccess_t type if you want to treat the file as a squid access file.

squid_initrc_exec_t

  • Set files with the squid_initrc_exec_t type if you want to transition an executable to the squid_initrc_t domain.

squid_log_t

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

Paths:

/var/log/squid(/.*)?, /var/log/squidGuard(/.*)?

squid_ra_content_t

  • Set files with the squid_ra_content_t type if you want to treat the files as squid read/append content.

squid_rw_content_t

  • Set files with the squid_rw_content_t type if you want to treat the files as squid read/write content.

squid_script_exec_t

  • Set files with the squid_script_exec_t type if you want to transition an executable to the squid_script_t domain.

Paths:

/usr/share/lightsquid/cgi(/.*)?, /usr/lib/squid/cachemgr.cgi

squid_tmp_t

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

squid_tmpfs_t

  • Set files with the squid_tmpfs_t type if you want to store squid files on a tmpfs file system.

squid_var_run_t

  • Set files with the squid_var_run_t type if you want to store the squid files under the /run or /var/run directory.
Note: File context can be temporarily modified with the chcon command. If you want to change the file context permanently 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. Don't skip that last step, bestie, it's literally the one that makes it stick. 😭💖

🛠️ 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. Mouse girlies, this one's for you. 🖱️✨

🖊️ AUTHOR 🖊️

This manual page was auto-generated using sepolicy manpage. Yes, a robot wrote it. We just gave it a makeover. 💅

👀 SEE ALSO 👀

selinux(8), squid(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8), squid_cron_selinux(8), squid_script_selinux(8)

And that's the whole page, bestie! 🌈 This one's from the squid manual, dated 26-10-06, and it's the squid_selinux(8) page. Go forth and label responsibly. 🦑💖🎀

📦 where this page comes from