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[ROOT] root@tumbleweed:~# cat /etc/cups/cupsd.conf
#
# Configuration file for the CUPS scheduler.  See "man cupsd.conf" for a
# complete description of this file.
#

# Log general information in error_log - change "warn" to "debug"
# for troubleshooting...
LogLevel warn
PageLogFormat

# Specifies the maximum size of the log files before they are rotated.  The value "0" disables log rotation.
MaxLogSize 1m

# Default error policy for printers
ErrorPolicy stop-printer

# Only listen for connections from the local machine.
Listen localhost:631
Listen /run/cups/cups.sock

# Show shared printers on the local network.
Browsing Yes
BrowseLocalProtocols dnssd

# Default authentication type, when authentication is required...
DefaultAuthType Basic

# Web interface setting...
WebInterface Yes

# Timeout after cupsd exits if idle (applied only if cupsd runs on-demand - with -l)
IdleExitTimeout 60

# Restrict access to the server...
<Location />
  Order allow,deny
</Location>

# Restrict access to the admin pages...
<Location /admin>
  AuthType Default
  Require user @SYSTEM
  Order allow,deny
</Location>

# Restrict access to configuration files...
<Location /admin/conf>
  AuthType Default
  Require user @SYSTEM
  Order allow,deny
</Location>

# Restrict access to log files...
<Location /admin/log>
  AuthType Default
  Require user @SYSTEM
  Order allow,deny
</Location>

# Set the default printer/job policies...
<Policy default>
  # Job/subscription privacy...
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default

  # Job-related operations must be done by the owner or an administrator...
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    Order deny,allow
  </Limit>

  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job>
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  <Limit CUPS-Get-Document>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  # All administration operations require an administrator to authenticate...
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # All printer operations require a printer operator to authenticate...
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # Only the owner or an administrator can cancel or authenticate a job...
  <Limit Cancel-Job>
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  <Limit CUPS-Authenticate-Job>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  <Limit All>
    Order deny,allow
  </Limit>
</Policy>

# Set the authenticated printer/job policies...
<Policy authenticated>
  # Job/subscription privacy...
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default

  # Job-related operations must be done by the owner or an administrator...
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    AuthType Default
    Order deny,allow
  </Limit>

  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  # All administration operations require an administrator to authenticate...
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # All printer operations require a printer operator to authenticate...
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # Only the owner or an administrator can cancel or authenticate a job...
  <Limit Cancel-Job CUPS-Authenticate-Job>
    AuthType Default
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  <Limit All>
    Order deny,allow
  </Limit>
</Policy>

# Set the kerberized printer/job policies...
<Policy kerberos>
  # Job/subscription privacy...
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default

  # Job-related operations must be done by the owner or an administrator...
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    AuthType Negotiate
    Order deny,allow
  </Limit>

  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
    AuthType Negotiate
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  # All administration operations require an administrator to authenticate...
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # All printer operations require a printer operator to authenticate...
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>

  # Only the owner or an administrator can cancel or authenticate a job...
  <Limit Cancel-Job CUPS-Authenticate-Job>
    AuthType Negotiate
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>

  <Limit All>
    Order deny,allow
  </Limit>
</Policy>

# The policy below is added by SUSE during build of our cups package.
# The policy 'allowallforanybody' is totally open and insecure and therefore
# it can only be used within an internal network where only trused users exist
# and where the cupsd is not accessible at all from any external host, see
# http://en.opensuse.org/SDB:CUPS_and_SANE_Firewall_settings
# Have in mind that any user who is allowed to do printer admin tasks
# can change the print queues as he likes - e.g. send copies of confidental
# print jobs from an internal network to any external destination, see
# http://en.opensuse.org/SDB:CUPS_in_a_Nutshell
# For documentation regarding 'Managing Operation Policies' see
# https://openprinting.github.io/cups/doc/policies.html
<Policy allowallforanybody>
  # Allow anybody to access job's private values:
  JobPrivateAccess all
  # Make none of the job values to be private:
  JobPrivateValues none
  # Allow anybody to access subscription's private values:
  SubscriptionPrivateAccess all
  # Make none of the subscription values to be private:
  SubscriptionPrivateValues none
  # Allow anybody to do all IPP operations:
  # Currently the IPP operations Validate-Job Cancel-Jobs Cancel-My-Jobs Close-Job CUPS-Get-Document
  # must be additionally exlicitly specified because those IPP operations are not included
  # in the "All" wildcard value - otherwise cupsd prints error messages of the form
  # "No limit for Validate-Job defined in policy allowallforanybody and no suitable template found."
  <Limit Validate-Job Cancel-Jobs Cancel-My-Jobs Close-Job CUPS-Get-Document>
    Order deny,allow
    Allow from all
  </Limit>
  # Since CUPS > 1.5.4 the "All" wildcard value must be specified separately,
  # otherwise clients like "lpstat -p" just hang up,
  # see https://bugzilla.opensuse.org/show_bug.cgi?id=936309
  # and https://www.cups.org/str.php?L4659
  <Limit All>
    Order deny,allow
    Allow from all
  </Limit>
</Policy>
# Explicitly set the CUPS 'default' policy to be used by default:
DefaultPolicy default

/etc/cups/client.conf

http://localhost:631

sudo usermod -a -G lp marc

su -
cat /etc/cups/cupsd.conf | grep -E "^Listen|^Port"

su -
systemctl stop cups.service cups.socket
rm -f /var/run/cups/cups.sock*
rm -f /var/cache/cups/*

su -
journalctl -xe -u cups.service | tail -10
tail -10 /var/log/cups/error_log

su -
systemctl status cups.service cups.socket
ls -la /var/run/cups/cups.socket
lpstat -r

lpinfo -m | grep -i brother

• Modules manquants : J'ai dû installer manuellement les modules supplémentaires pour accéder à l'ensemble des fonctionnalités.
  
• Configuration incomplète : Une installation automatique ne suffit pas ; une seconde phase de lancer des services manuellement s'avère nécessaire.
  
  

sudo usermod -r -G libvirt,kvm eric

sudo usermod -r -G libvirt,kvm root

groups eric   RESULTAT # → eric : eric
groups root   RESULTAT # → root : root

usermod -a -G libvirt,kvm eric

groups $USER

sudo usermod -a -G libvirt,kvm $USER

groups $USER