Ubuntu
cups package

cupsctl can corrupt cupsd.conf if invoked by member of lpadmin group

Bug #1536201 reported by Arney on 2016-01-20

This bug affects 2 people

Affects		Status	Importance	Assigned to	Milestone
	cups (Ubuntu)	Confirmed	Undecided	Unassigned

Bug Description

In Ubuntu 14.04 and 15.10, the sequence

sudo cupsctl WebInterface=No
sudo cupsctl WebInterface=Yes

always does what it is supposed to, but if a member of the 'lpadmin' group invokes

cupsctl WebInterface=No
cupsctl WebInterface=Yes

without 'sudo', /etc/cups/cupsd.conf will be corrupted to:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  <HTML>
  <HEAD>
  <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
    <TITLE>Web Interface is Disabled - CUPS v1.7.2</TITLE>
      <LINK REL="STYLESHEET" TYPE="text/css" HREF="/cups.css">
      </HEAD>
      <BODY>
      <H1>Web Interface is Disabled</H1>
        <P>The web interface is currently disabled. Run "cupsctl WebInterface=yes" to enable it.</P>
        </BODY>
      </HTML>
WebInterface Yes

and the cups daemon will start malfunctioning instantly.

This does not happen on CentOS or FreeBSD, so the Ubuntu package is not configured correctly.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: cups 1.7.2-0ubuntu1.7
ProcVersionSignature: Ubuntu 3.13.0-76.120-generic 3.13.11-ckt30
Uname: Linux 3.13.0-76-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Jan 20 15:16:32 2016
InstallationDate: Installed on 2015-02-13 (340 days ago)
InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
Lpstat: Error: command ['lpstat', '-v'] failed with exit code 1: lpstat: Bad file descriptor
MachineType: Hewlett-Packard HP Z600 Workstation
Papersize: a4
PpdFiles:
Buero: HP Business Inkjet 3000 PS - RC1.1 Postscript (recommended)
Testo: Generic PostScript Printer
XeroxFollowMe: Xerox Global Printer Driver PS3
ServerraumErsatz: HP LaserJet 1320 series Postscript (recommended)
Serverraum: HP Color LaserJet 4730mfp Postscript (recommended)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-76-generic root=UUID=3d82eb97-c695-48dc-8766-aa6277e95d4c ro quiet splash
SourcePackage: cups
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/19/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786G4 v01.17
dmi.board.name: 0AE8h
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC9473M6D
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr786G4v01.17:bd08/19/2009:svnHewlett-Packard:pnHPZ600Workstation:pvr:rvnHewlett-Packard:rn0AE8h:rvr:cvnHewlett-Packard:ct6:cvr:
dmi.product.name: HP Z600 Workstation
dmi.sys.vendor: Hewlett-Packard

Tags:

Revision history for this message

Arney (launchpaa) wrote on 2016-01-20:

BootDmesg.txt Edit (66.0 KiB, text/plain; charset="utf-8")
CupsErrorLog.txt Edit (31.0 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (13.7 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (7.8 KiB, text/plain; charset="utf-8")
KernLog.txt Edit (62.7 KiB, text/plain; charset="utf-8")
Locale.txt Edit (314 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (32.5 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (730 bytes, text/plain; charset="utf-8")
PrintingPackages.txt Edit (1.1 KiB, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (6.6 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (316 bytes, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (3.3 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (3.4 KiB, text/plain; charset="utf-8")
UdevDb.txt Edit (170.4 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (363.3 KiB, text/plain; charset="utf-8")

Revision history for this message

Launchpad Janitor (janitor) wrote on 2016-01-20:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in cups (Ubuntu):
status:	New → Confirmed

Revision history for this message

Till Kamppeter (till-kamppeter) wrote on 2016-01-20:

I have also discovered this already, but not that it only happens if a user from the lpadmin group call systemctl.

See this upstream bug:

http://www.cups.org/str.php?L4755

Jamie Strandboge (jdstrand) on 2017-03-23

tags:

removed: apparmor

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Ubuntucups package

cupsctl can corrupt cupsd.conf if invoked by member of lpadmin group

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Ubuntu
cups package