FYI:

Some documentation refers to the third set of permissions as "other" or
"all" rather than as "world."

Thomas
 On Mar 1, 2014 1:10 PM, "David Wagle" <david.wagle at gmail.com> wrote:

> OK -- so understanding the numbers on modes:
>
> There are three sets of permissions, those for the OWNER, the GROUP and
> WORLD.
>
> Each permission set is controlled by a bit string that is 4 bits long.
>
> If the first bit is a 1, then that group has read permissions.
>
> A bit string (base 2) of 0001 has a decimal value of 1 because 0x2^3 +
> 0x2^2 + 0x2^1 + 1x2^0 = 1 and corresponds to execute permission
>
> A bit string (base 2) of 0010 has a decimal value of 2 because 0x2^3 +
> 0x2^2 + 1x2^1 + 0x2^0 = 2 and corresponds to write permission
>
> A bit string (base 2) of 0100 has a decimal value of 4 because 0x2^3 +
> 1x2^2 + 0x2^1 + 0x2^0 = 4 and corresponds to read permission
>
> The fourth bit is used for special permissions like "the sticky bit" and
> is really beyond the basics.
>
> Now, because the values of 1, 2 and 4 are bit-independent, any combination
> of those values is the equivilant of 'OR'ing the bit strings.
>
> So, if we want read and write permission we want both 4 and 2. That is we
> want the bit mask to be 011. Which is 0x2^3 + 1x2^2 + 1x2^1 + 0x2^0 = 6.
> Which is what you get if you add 4 + 2.
>
> So a mask of, say 751 is RWX for Owner, R+X for Group and R for World.
>
> As for which link to follow --- without your box in front of me to
> troubleshoot, I really can't say "here's what to do."
>
> However, I'd start with setting your library to minimal permission since
> what you're getting is a permissions error. That would be at least as
> strict as 660.
>
> I would also then check that your users are in the same group as your
> print service -- which is usually 'wheel,' but not always.
>
>
> On Sat, Mar 1, 2014 at 12:35 PM, paul g <pj.world at hotmail.com> wrote:
>
>> David thanks for the great link and advice.
>>
>> I will reset world with command?      'chown root:root brfaxfilter'
>>
>> I will then     'chmod go+x'
>>
>> ????
>>
>> Can you please recommend which area of the link you sent I should
>> possibly follow?
>>
>> There are chmod 555 and 700 's etc making me confused.
>>
>> I will restart 'cups' using the command 'sudo service cups restart'
>>
>> Thanks alot for your help with this.
>>
>> ------------------------------
>> Date: Sat, 1 Mar 2014 00:11:02 -0600
>>
>> From: david.wagle at gmail.com
>> To: tclug-list at mn-linux.org
>> Subject: Re: [tclug-list] A question about printing'
>>
>> Looks like you're not the only one to run into this:
>>
>> http://ubuntuforums.org/archive/index.php/t-1368410.html
>>
>>
>> On Sat, Mar 1, 2014 at 12:06 AM, David Wagle <david.wagle at gmail.com>wrote:
>>
>> Also - you probably have to restart CUPS to have it re-read the library.
>>
>>
>> On Sat, Mar 1, 2014 at 12:03 AM, David Wagle <david.wagle at gmail.com>wrote:
>>
>> Paul - again, there's no reason for world permissions to be anything.
>> Anyone authorized to use the service should be in the same group as the
>> service.
>>
>>
>> On Fri, Feb 28, 2014 at 7:36 PM, paul g <pj.world at hotmail.com> wrote:
>>
>> Again I am sorry to repost BUT the following should be noted:
>>
>> I am using a majic jack based telephone line system 'VOIP',
>>
>> I have adjusted the MFC-295CN to 9600 baud rate 'fax',
>>
>> I do of course have a high speed ethernet connection,
>>
>> Your help is always appreciated.
>>
>> Thank you for your time,
>>
>> Paul G
>>
>>
>> ------------------------------
>> From: pj.world at hotmail.com
>> To: tclug-list at mn-linux.org
>> Date: Fri, 28 Feb 2014 19:16:31 -0600
>>
>> Subject: Re: [tclug-list] A question about printing'
>>
>> I just preformed a 'chmod' command and permissions NOW look like this for
>> the file:
>>
>> located under: deb at deb-desktop /usr/lib/cups/filter $
>>
>> -rwxrw-rw-  1 root deb  5.2K Nov 24  2005 brfaxfilter
>>
>> command I entered was:
>>
>> sudo chmod go-x  brfaxfilter
>>
>> to remove execute.
>>
>> rebooted the machine same thing still shows up in Cups.
>>
>> ------------------------------
>> Date: Fri, 28 Feb 2014 17:58:10 -0600
>> From: david.wagle at gmail.com
>> To: tclug-list at mn-linux.org
>> Subject: Re: [tclug-list] A question about printing'
>>
>> ls -l of /usr/lib/cups/filter/brfaxfilter
>>
>> Looks like you have a sticky bit set and have it 'rwx' for all. It really
>> only probably needs to be 'rw-' for owner and group, and then any user who
>> is allowed to use it  should be in that group. There should be no need for
>> a sticky bit to be set.
>>
>>
>>
>> On Fri, Feb 28, 2014 at 5:51 PM, paul g <pj.world at hotmail.com> wrote:
>>
>> I have successfully installed the 'CUPS' and the appropriate drivers for
>> a model 'MFC-295CN' Brother printer.
>>
>> The machine is running kernel: Linux deb-desktop 3.2.0-59-generic
>> #90-Ubuntu SMP Tue Jan 7 22:47:22 UTC 2014 i686 i686 i386 GNU/Linux
>>
>>
>> I can print documents properly as well as scan them using xsane. Test
>> page printout work great! also 'full color'.
>>
>> My issue is with the accompanied 'BRFAX' which I have installed also uses
>> 'Cups' is as follows:
>>
>> When I click on 'BRFAX' inside 'Cups'
>> Reports an error:
>>
>> The error is as follows: 'shown in Cups'
>>
>> Stopped - File "/usr/lib/cups/filter/brfaxfilter" has insecure
>> permissions (0100777/uid=0/gid=0).
>>
>> deb at deb-desktop /usr/lib/cups/filter $ ls -lah
>> -rwxrwxrwx  1 root root 5.2K Nov 24  2005 brfaxfilter
>>
>> dpkg -l | grep Brother
>>
>> ii  brmfcfaxcups
>> 1.0.0-2                                 Brother MFC/FAX fax share function
>> driver
>> ii  brmfcfaxlpd
>> 1.0.0-2                                 Brother MFC-FAX LPD driver
>> ii  brother-udev-rule-type1
>> 1.0.0-1                                 Brother udev rule type 1
>> ii  brscan-skey
>> 0.2.4-1                                 Brother Linux scanner S-KEY tool
>> ii  brscan3
>> 0.2.11-4                                Brother Scanner Driver
>> ii  mfc295cncupswrapper
>> 1.1.3-1                                 Brother CUPS Inkjet Printer
>> Definitions
>> ii  mfc295cnlpr
>> 1.1.3-1                                 Brother lpr Inkjet Printer
>> Definitions
>> ii  printer-driver-ptouch
>> 1.3-3ubuntu0.1                          printer driver Brother P-touch
>> label printers
>>
>> Any ideas on where to go from here?
>>
>> Thank You,
>>
>> Paul G
>>
>>
>>
>>
>>
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>
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