k3b wont burn when running as a user

bunnyknight13 · 04-22-2006, 07:41 AM

I'm trying to burn a Data CD as a nonpriviledged user with k3b and it gives me an error message. It also doesn't work when burning with SUID set for /usr/bin/cdrecorder

This is the debug output from k3b(/usr/bin/cdrecorder doesn't have SUID set)

Code:

System
-----------------------
K3b Version: 0.12.15

KDE Version: 3.5.2
QT Version:  3.3.5
Kernel:      2.6.16
Devices
-----------------------
HL-DT-ST CD-RW GCE-8160B 2.01 (/dev/hdc, ) at /mnt/cdrom [CD-R; CD-RW; CD-ROM] [CD-ROM; CD-R; CD-RW] [SAO; TAO; RAW; SAO/R96P; SAO/R96R; RAW/R16; RAW/R96P; RAW/R96R]

DVDROM 8 X 40 (/dev/hdd, ) at /mnt/dvd [CD-ROM; DVD-ROM] [Error] [None]
K3b
-----------------------
Size of filesystem calculated: 358519

Used versions
-----------------------
cdrecord: 2.1.1a04

cdrecord
-----------------------
/usr/bin/cdrecord: Warning: Running on Linux-2.6.16
/usr/bin/cdrecord: There are unsettled issues with Linux-2.5 and newer.
/usr/bin/cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
/usr/bin/cdrecord: Cannot allocate memory. WARNING: Cannot do mlockall(2).
/usr/bin/cdrecord: WARNING: This causes a high risk for buffer underruns.
/usr/bin/cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
/usr/bin/cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
/usr/bin/cdrecord: WARNING: This causes a high risk for buffer underruns.
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
SCSI buffer size: 64512
Cdrecord-Clone 2.01.01a04 (i686-pc-linux-gnu) Copyright (C) 1995-2006 Jörg Schilling
TOC Type: 1 = CD-ROM
Using libscg version 'schily-0.8'.
Driveropts: 'burnfree'
atapi: 1
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   : 
Vendor_info    : 'HL-DT-ST'
Identifikation : 'CD-RW GCE-8160B '
Revision       : '2.01'
Device seems to be: Generic mmc CD-RW.
Current: 0x0009
Profile: 0x000A 
Profile: 0x0009 (current)
Profile: 0x0008 
Profile: 0x0002 (current)
Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
Driver flags   : MMC-2 SWABAUDIO BURNFREE 
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 1971200 = 1925 KB
FIFO size      : 4194304 = 4096 KB
/usr/bin/cdrecord: Operation not permitted. Cannot send SCSI cmd via ioctl
Track 01: data   700 MB        
Total size:      804 MB (79:40.25) = 358519 sectors
Lout start:      804 MB (79:42/19) = 358519 sectors

cdrecord command:
-----------------------
/usr/bin/cdrecord -v gracetime=2 dev=/dev/hdc speed=16 -dao driveropts=burnfree -eject -data -tsize=358519s - 

mkisofs
-----------------------
358519

mkisofs command:
-----------------------
/usr/bin/mkisofs -gui -graft-points -volid K3b data project -volset  -appid K3B THE CD KREATOR (C) 1998-2005 SEBASTIAN TRUEG AND THE K3B TEAM -publisher  -preparer  -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-luna/k3btYxpMb.tmp -rational-rock -hide-list /tmp/kde-luna/k3bXYGusa.tmp -joliet -hide-joliet-list /tmp/kde-luna/k3bDiv7Yb.tmp -full-iso9660-filenames -iso-level 2 -path-list /tmp/kde-luna/k3bqqjRcc.tmp

dannystaple · 04-22-2006, 08:04 AM

Hmm - on at least a few distros, there is a group which has permission for burning CDs/DVD's. You should take a look to see if your distro has the group and make sure that this nonprivileged user is at least a member of that group. Basically the group is one that has write permissions to the device that corresponds to your burner - ie /dev/hdc/.

Cheers,
Danny

Sören Schneider · 04-22-2006, 08:38 AM

I had a similar problem.
My CD-Burner was mounted read-only

bunnyknight13 · 04-22-2006, 11:12 AM

neither have worked

dannystaple · 04-22-2006, 12:00 PM

Hmm - I am wandering if permissions have anything to do with it. You say it does not burn even with SUID set. It you actually run kb as root, can you burn then?

Danny

petespin27 · 04-22-2006, 12:01 PM

Try running k3bsetup. It will fix the permissions so that you can burn cds.

bunnyknight13 · 04-22-2006, 12:08 PM

-->I moved cdrecord to cdrecord-bin(still not sticky)
-->then made a new script called cdrecord:

Code:

#!/bin/bash
sudo cdrecord $@
exit

-->and changed the permissions to rx and suid and made luna the owner(luna is my guest user account)
-->then added the following lines to /etc/sudoers

Code:

Cmnd_Alias      CDRECORD        = /usr/bin/cdrecord-bin
luna    ALL= NOPASSWD:CDRECORD

---
It worked

rickh · 04-22-2006, 05:33 PM

Here's what I did:
1. Identify cdrecord executables

debian:~# ls -l /usr/bin/cdrecord*
-rwsr-xr-x 1 root root 133 Jan 10 10:15 /usr/bin/cdrecord
-rwxr-xr-x 1 root root 367320 Jan 10 10:15 /usr/bin/cdrecord.mmap
-rwxr-xr-x 1 root root 367352 Jan 10 10:15 /usr/bin/cdrecord.shm

2. Setuid

debian:~# chmod u+s /usr/bin/cdrecord
debian:~# chmod u+s /usr/bin/cdrecord.mmap
debian:~# chmod u+s /usr/bin/cdrecord.shm

3. Check for success

debian:~# ls -l /usr/bin/cdrecord*
-rwsr-xr-x 1 root root 133 Jan 10 10:15 /usr/bin/cdrecord
-rwsr-xr-x 1 root root 367320 Jan 10 10:15 /usr/bin/cdrecord.mmap
-rwsr-xr-x 1 root root 367352 Jan 10 10:15 /usr/bin/cdrecord.shm

I don't know if it was necessary to change them all, but it worked.

Sören Schneider · 04-22-2006, 07:02 PM

Login as ROOT and see if you can burn.
If not it's not a permission prob..