Mentioned Solaris and system dependent drive permission settings
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README
4
README
@ -145,6 +145,8 @@ The project components (list subject to growth, hopefully):
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also allows to grow ISO-9660 filesystem images on multi-session
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media as well as on overwriteable media via the same API.
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All media peculiarities are handled automatically.
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It also contains the methods of command oriented application
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xorriso and offers them via a C language API.
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- cdrskin is a limited cdrecord compatibility wrapper for libburn.
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cdrecord is a powerful GPL'ed burn program included in Joerg
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@ -164,6 +166,8 @@ The project components (list subject to growth, hopefully):
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changing, incremental backups, activating boot images, and
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extracting of files from ISO images to disk. An own ISO 9660
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extension stores ACLs, xattr, and MD5 of file content.
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All features of xorriso are also available via a C language API
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of libisoburn.
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See xorriso/README for more.
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- "test" is a collection of application gestures and examples given by the
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@ -104,17 +104,25 @@ The output of cdrskin --devices might look like
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0 dev='/dev/sr0' rwrwr- : '_NEC' 'DVD_RW ND-4570A'
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1 dev='/dev/sr1' rwrw-- : 'HL-DT-ST' 'DVDRAM GSA-4082B'
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So full and insecure enabling of both for everybody would look like
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chmod a+rw /dev/sr0 /dev/sr1
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On Linux, full and insecure enabling of both for everybody would look like
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chmod a+rw /dev/sr0 /dev/hda
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This is equivalent to the traditional setup chmod a+x,u+s cdrecord.
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On FreeBSD, device permissions are to be set in /etc/devfs.rules.
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On Solaris, pfexec privileges may be restricted to "base,sys_devices".
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See below "System Dependend Drive Permission Examples".
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I strongly discourage to run cdrskin with setuid root or via sudo !
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It is not checked for the necessary degree of hacker safety.
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Better consider to grant the necessary permissions to group "floppy"
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and to add users to it.
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A behavioral conflict is known between any burn software and demons like hald
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which probe CD drives. This can spoil burn runs for CD-R or CD-RW.
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You may have to keep your hald away from the drive. See for example
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http://www.freebsd.org/gnome/docs/halfaq.html
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Consider to put all authorized users into group "floppy", to chgrp the
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device file to that group and to disallow w-access to others.
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Helpful with Linux kernel 2.4 is a special SCSI feature:
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It is possible to address a scsi(-emulated) drive via associated device files
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@ -123,11 +131,6 @@ as listed device files. This addressing via e.g. /dev/sr0 or /dev/scd1 is
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compatible with generic read programs like dd and with write program growisofs.
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For finding /dev/sg1 from /dev/sr0, the program needs rw-access to both files.
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A behavioral conflict is known between any burn software and demons like hald
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which probe CD drives. This can spoil burn runs for CD-R or CD-RW.
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You may have to keep your hald away from the drive. See for example
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http://www.freebsd.org/gnome/docs/halfaq.html
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Usage examples
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@ -434,6 +437,77 @@ It will not read startup files, will abort on option dev_translation= ,
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will not have a fifo buffer, and will not be able to put out help texts or
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debugging messages.
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------------------------------------------------------------------------------
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System Dependend Drive Permission Examples
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Accessing the optical drives requires privileges which usually are granted
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only to the superuser. Linux, FreeBSD and Solaris offer quite different
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approaches for avoiding the need for unrestricted privileges.
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---------------------
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On all three systems:
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---------------------
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Add the authorized user of CD drives to group "floppy" in /etc/group.
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If missing: create this group.
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Changes to /etc/group often only affect new login sessions. So log out and in
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before making the first tests.
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---------
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On Linux:
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---------
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Allow rw-access to the drives
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chgrp floppy /dev/sr0 /dev/sr1
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chmod g+rw /dev/sr0 /dev/sr1
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It might be necessary to perform chgrp and chmod after each reboot or to
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edit distro dependent device configuration files for permanent settings.
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-----------
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On FreeBSD:
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-----------
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On FreeBSD:
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Edit /etc/devfs.rules and make sure to have these lines
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[localrules=10]
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add path 'acd*' mode 0664 group floppy
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add path 'cd*' mode 0664 group floppy
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add path 'pass*' mode 0664 group floppy
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add path 'xpt*' mode 0664 group floppy
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[localrules=5]
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add path 'pass*' mode 0664 group floppy
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add path 'cd*' mode 0664 group floppy
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add path 'xpt*' mode 0664 group floppy
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add path 'acd*' mode 0664 group floppy
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Edit /etc/rc.conf and add the following line if missing
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devfs_system_ruleset="localrules"
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This gets into effect by reboot or by command
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/etc/rc.d/devfs start
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-----------
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On Solaris:
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-----------
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Run cdrskin by
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pfexec cdrskin ...arguments...
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The following settings will make pfexec keep original UID and EUID and prevent
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most superuser powers. Be aware that you still can manipulate all device files
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if you have the file permissions for that.
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Full root privileges for cdrskin can then be aquired only by command su.
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Edit /etc/security/exec_attr and add this line to the other "Media Backup"
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lines:
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Media Backup:solaris:cmd:::/usr/local/bin/cdrskin:privs=basic,sys_devices
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Edit /etc/user_attr and add profile "Media Backup" to the user's line:
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thomas::::profiles=Media Backup,Primary Administrator;roles=root
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See also man privileges, man exec_attr, man user_attr.
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Then allow the group r-access to the drives
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pfexec chgrp floppy /dev/rdsk/c3t0d0s2 /dev/rdsk/c4t0d0s2
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pfexec chmod g+r /dev/rdsk/c3t0d0s2 /dev/rdsk/c4t0d0s2
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The last two commands have to be executed after each boot. I do not know
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the relevant device configuration files yet.
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------------------------------------------------------------------------------
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Project aspects and legal stuff
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@ -2,7 +2,7 @@
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.\" First parameter, NAME, should be all caps
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.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
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.\" other parameters are allowed: see man(7), man(1)
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.TH CDRSKIN 1 "Feb 29, 2010"
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.TH CDRSKIN 1 "Jun 10, 2010"
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.\" Please adjust this date whenever revising the manpage.
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.\"
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.\" Some roff macros, for reference:
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@ -271,19 +271,22 @@ the drive is somewhat higher but the overall system is much less at stake.
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Consider to restrict rw-access to a single group which bundles the users who
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are allowed to use the burner drive (like group "floppy").
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.br
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For drive permission examples on Linux, FreeBSD, and Solaris,
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see cdrskin/README.
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.br
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.PP
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If you only got one CD capable drive then you may leave out cdrskin option
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\fBdev=\fP. Else you should use this option to address the drive you want.
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.br
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cdrskin option dev= not only accepts the listed addresses but also
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traditional cdrecord SCSI addresses which on Linux consist of three
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numbers: Bus,Target,Lun. There is also a related address family "ATA" which
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traditional cdrecord SCSI addresses which consist of three numbers:
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Bus,Target,Lun. On Linux there is also a related address family "ATA" which
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accesses IDE drives not under control of Linux SCSI drivers:
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ATA:Bus,Target,Lun.
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.br
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See option -scanbus for getting a list of cdrecord style addresses.
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.br
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Further are accepted on Linux: links to libburn-suitable device files,
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Further are accepted: links to libburn-suitable device files,
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device files which have the same major and minor device number,
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and device files which have the same SCSI address parameters (e.g. /dev/sg0).
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.br
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