cupsd_selinux(8)

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

💅 cupsd_selinux — your girl's guide to the SELinux policy for cupsd (section 8)

okay so bestie, welcome to cupsd_selinux(8) — the manual page for the SELinux Policy for the cupsd processes. this is part 1 and we're going to get through literally all of it together, no skimming, no cap 💖

✨ NAME ✨

cupsd_selinux — Security Enhanced Linux Policy for the cupsd processes 🎀

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the cupsd processes via flexible mandatory access control. that's the whole vibe — MAC, but make it secure.

The cupsd processes execute with the cupsd_t SELinux type. want to check if you've got these processes running? just run the ps command with the -Z qualifier. easy.

For example:

ps -eZ | grep cupsd_t

that's it, that's the check 🫶

🦋 ENTRYPOINTS 🦋

The cupsd_t SELinux type can be entered via the cupsd_exec_t file type. (yes, that's the doorway, and we're walking through it ✨)

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

/usr/bin/hp-[^/]+
/usr/share/hplip/.*.py
/usr/lib/cups/backend/hp.*
/usr/bin/cupsd
/usr/bin/hpijs
/usr/bin/hpiod
/usr/bin/cups-browsed

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. iconic behaviour, 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 cupsd policy is very flexible, allowing users to setup their cupsd processes in as secure a method as possible. we love a customizable queen 💅

The following process types are defined for cupsd:

  • cupsd_config_t
  • cupsd_t
  • cupsd_lpd_t
  • cups_brf_t
  • cups_pdf_t
Note: semanage permissive -a cupsd_t can be used to make the process type cupsd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it's not a free pass — the receipts still show up 😭

🔥 BOOLEANS 🔥

SELinux policy is customizable based on least access required. cupsd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run cupsd with the tightest access possible. tightest access = bestie behaviour, fr fr.

  • cups_execmem — if you want to allow cups execmem/execstack, you must turn on this boolean. Disabled by default.
setsebool -P cups_execmem 1
  • daemons_dontaudit_scheduling — if you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on this boolean. Enabled by default.
setsebool -P daemons_dontaudit_scheduling 1
  • fips_mode — if you want to allow all domains to execute in fips_mode, you must turn on this boolean. Enabled by default.
setsebool -P fips_mode 1
  • kerberos_enabled — if you want to allow confined applications to run with kerberos, you must turn on this boolean. Enabled by default.
setsebool -P kerberos_enabled 1
  • nis_enabled — if you want to allow system to run with NIS, you must turn on this boolean. Disabled by default.
setsebool -P nis_enabled 1

🗂️ MANAGED FILES 🗂️

The SELinux process type cupsd_t can manage files labeled with the following file types. the paths listed are the default paths for these file types. note: the process's UID still needs to have DAC permissions. SELinux isn't out here overriding DAC, okay? both need to be on board 🫶

  • 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
  • cupsd_interface_t
/etc/cups/interfaces(/.*)?
  • cupsd_lock_t — no default paths listed for this one 🫧
  • cupsd_log_t
/var/log/hp(/.*)?
/var/log/cups(/.*)?
/usr/Brother/fax/.*.log.*
/var/log/turboprint.*
/usr/local/Brother/fax/.*.log.*
  • cupsd_rw_etc_t
/etc/printcap.*
/etc/cups/ppd(/.*)?
/usr/Brother/(.*/)?inf(/.*)?
/usr/Printer/(.*/)?inf(/.*)?
/usr/lib/bjlib(/.*)?
/var/lib/iscan(/.*)?
/var/cache/cups(/.*)?
/etc/cups/certs/.*
/etc/opt/Brother/(.*/)?inf(/.*)?
/etc/cups/lpoptions.*
/var/cache/foomatic(/.*)?
/usr/local/Brother/(.*/)?inf(/.*)?
/usr/local/Printer/(.*/)?inf(/.*)?
/etc/cups/cupsd.conf.*
/var/lib/cups/certs/.*
/opt/gutenprint/ppds(/.*)?
/opt/brother/Printers(.*/)?inf(/.*)?
/etc/cups/classes.conf.*
/etc/cups/printers.conf.*
/etc/cups/subscriptions.*
/etc/opt/brother/Printers/(.*/)?inf(/.*)?
/usr/local/linuxprinter/ppd(/.*)?
/var/cache/alchemist/printconf.*
/etc/alchemist/namespace/printconf(/.*)?
/etc/cups/certs
/etc/cups/ppds.dat
/var/lib/cups/certs
/usr/share/foomatic/db/oldprinterids
  • cupsd_tmp_t — no default paths listed here either, it's giving mystery 💀
  • cupsd_var_lib_t
/var/lib/hp(/.*)?
  • cupsd_var_run_t
/run/hp.*.pid
/run/hp.*.port
/run/cups(/.*)?
/var/ccpd(/.*)?
/var/ekpd(/.*)?
/run/hplip(/.*)
/var/turboprint(/.*)?
/run/ecblp0
  • 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
  • print_spool_t
/var/spool/lpd(/.*)?
/var/spool/cups(/.*)?
/var/spool/cups-pdf(/.*)?
  • root_t
/sysroot/.aleph-version.json
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
/var/lib/ntp
  • security_t
/selinux
  • snmpd_var_lib_t
/var/agentx(/.*)?
/var/net-snmp(/.*)
/var/lib/snmp(/.*)?
/var/net-snmp(/.*)?
/var/lib/net-snmp(/.*)?
/var/spool/snmptt(/.*)?
/usr/share/snmp/mibs/.index
  • usbfs_t — no default paths listed for this one either 🌈

and that's where part 1 wraps, bestie — but we're not done yet, so don't go anywhere 💜

💅 FILE CONTEXTS 💅

Okay so SELinux requires files to have an extended attribute to define the file type. Like, it needs the receipts, bestie. 💅

You can see the context of a file using the -Z option to ls — yes, ls -Z is the vibe check. 🔍

Policy governs the access confined processes have to these files. SELinux cupsd policy is very flexible, allowing users to set up their cupsd processes in as secure a method as possible. No cap. ✨

🌸 STANDARD FILE CONTEXT 🌸

SELinux defines the file context types for the cupsd. 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 cupsd_config_exec_t '/srv/cupsd/content(/.*)?'
restorecon -R -v /srv/mycupsd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files. Regex girlies, this one’s for you. 🧚

The following file types are defined for cupsd:

🎀 cupsd_config_exec_t

Set files with the cupsd_config_exec_t type if you want to transition an executable to the cupsd_config_t domain.

Paths:

/usr/bin/hal_lpadmin, /usr/libexec/hal_lpadmin, /usr/bin/printconf-backend,
/usr/bin/cups-config-daemon, /usr/lib/udev/udev-configure-printer,
/usr/libexec/cups-pk-helper-mechanism

🎀 cupsd_config_var_run_t

Set files with the cupsd_config_var_run_t type if you want to store the cupsd config files under the /run or /var/run directory.

🎀 cupsd_etc_t

Set files with the cupsd_etc_t type if you want to store cupsd files in the /etc directories.

Paths:

/etc/hp(/.*)?, /etc/cups(/.*)?, /usr/share/cups(/.*)?

🎀 cupsd_exec_t

Set files with the cupsd_exec_t type if you want to transition an executable to the cupsd_t domain.

Paths:

/usr/bin/hp-[^/]+, /usr/share/hplip/.*.py, /usr/lib/cups/backend/hp.*,
/usr/bin/cupsd, /usr/bin/hpijs, /usr/bin/hpiod, /usr/bin/cups-browsed

🎀 cupsd_initrc_exec_t

Set files with the cupsd_initrc_exec_t type if you want to transition an executable to the cupsd_initrc_t domain.

🎀 cupsd_interface_t

Set files with the cupsd_interface_t type if you want to treat the files as cupsd interface data.

🎀 cupsd_lock_t

Set files with the cupsd_lock_t type if you want to treat the files as cupsd lock data, stored under the /var/lock directory.

🎀 cupsd_log_t

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

Paths:

/var/log/hp(/.*)?, /var/log/cups(/.*)?, /usr/Brother/fax/.*.log.*,
/var/log/turboprint.*, /usr/local/Brother/fax/.*.log.*

🎀 cupsd_lpd_exec_t

Set files with the cupsd_lpd_exec_t type if you want to transition an executable to the cupsd_lpd_t domain.

🎀 cupsd_lpd_tmp_t

Set files with the cupsd_lpd_tmp_t type if you want to store cupsd lpd temporary files in the /tmp directories.

🎀 cupsd_lpd_var_run_t

Set files with the cupsd_lpd_var_run_t type if you want to store the cupsd lpd files under the /run or /var/run directory.

🎀 cupsd_rw_etc_t

Set files with the cupsd_rw_etc_t type if you want to store cupsd rw files in the /etc directories.

Paths:

/etc/printcap.*, /etc/cups/ppd(/.*)?,
/usr/Brother/(.*/)?inf(/.*)?, /usr/Printer/(.*/)?inf(/.*)?,
/usr/lib/bjlib(/.*)?, /var/lib/iscan(/.*)?, /var/cache/cups(/.*)?,
/etc/cups/certs/.*, /etc/opt/Brother/(.*/)?inf(/.*)?,
/etc/cups/lpoptions.*, /var/cache/foomatic(/.*)?,
/usr/local/Brother/(.*/)?inf(/.*)?, /usr/local/Printer/(.*/)?inf(/.*)?,
/etc/cups/cupsd.conf.*, /var/lib/cups/certs/.*,
/opt/gutenprint/ppds(/.*)?, /opt/brother/Printers(.*/)?inf(/.*)?,
/etc/cups/classes.conf.*, /etc/cups/printers.conf.*,
/etc/cups/subscriptions.*, /etc/opt/brother/Printers/(.*/)?inf(/.*)?,
/usr/local/linuxprinter/ppd(/.*)?, /var/cache/alchemist/printconf.*,
/etc/alchemist/namespace/printconf(/.*)?, /etc/cups/certs,
/etc/cups/ppds.dat, /var/lib/cups/certs,
/usr/share/foomatic/db/oldprinterids

🎀 cupsd_tmp_t

Set files with the cupsd_tmp_t type if you want to store cupsd temporary files in the /tmp directories.

🎀 cupsd_unit_file_t

Set files with the cupsd_unit_file_t type if you want to treat the files as cupsd unit content.

🎀 cupsd_var_lib_t

Set files with the cupsd_var_lib_t type if you want to store the cupsd files under the /var/lib directory.

🎀 cupsd_var_run_t

Set files with the cupsd_var_run_t type if you want to store the cupsd files under the /run or /var/run directory.

Paths:

/run/hp.*.pid, /run/hp.*.port, /run/cups(/.*)?, /var/ccpd(/.*)?,
/var/ekpd(/.*)?, /run/hplip(/.*), /var/turboprint(/.*)?, /run/ecblp0
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. 🔥

⚡ 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. 🖥️

💖 AUTHOR 💖

This manual page was auto-generated using sepolicy manpage. Slay, automation. 🤖✨

🌈 SEE ALSO 🌈

💖 And that’s the tea: this is cupsd_selinux(8) from the cupsd source, dated 26-10-06. Byeee bestie! 💅✨

📦 where this page comes from