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Top Forums Shell Programming and Scripting [Solved] Permission problem, programming advice needed, Perl Post 302889213 by zaxxon on Wednesday 19th of February 2014 11:37:19 AM
Old 02-19-2014
[Solved] Permission problem, programming advice needed, Perl

Hi all,

I have written a wrapper script in Perl which will be used on AIX, Linux and Windows and I do not want to change any code for the needs for a specific OS if avoidable.
It works fine so far on all 3 OSes, not blowing up any stacks any more, but I am unsure how to handle writing log files and some other temporary files it needs for some status tracking as it is no demon and will terminate when it's done.

The script will be called by different users and produce the mentioned files. My problem is, that I currently have to give the calling user write permissions to the directory where the logs will be written.
I would like to avoid this and let the logs belong to the user that owns the script so that the calling user will not be able to manipulate any of the files that are written.

su, sudo etc. is no option.
I tried setting setuid-bit, but that didn't help. The created files were still owned by the calling user.

Maybe there is a simpler method to overcome this problem but currently I think about something like trying to change the effective UID for this and see if it helps.

Any ideas or corrections of my thoughts are welcome!

Last edited by zaxxon; 02-19-2014 at 12:44 PM.. Reason: rephrasing
 

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FAXCRON(8)						      System Manager's Manual							FAXCRON(8)

NAME
faxcron - HylaFAX routine maintenance script SYNOPSIS
/usr/sbin/faxcron [ -n ] [ -l lastrun ] DESCRIPTION
faxcron is a command script that does routine upkeep tasks in a HylaFAX spooling directory hierarchy. This script is intended to be invoked from cron(8) on behalf of the fax user (often the ``fax'' user is uucp) once a day, with the standard output sent by mail to the HylaFAX administrator. For example, the following crontab might be set up for the fax user: 25 23 * * * sh /usr/sbin/faxcron | mail FaxMaster The faxcron script does the following work: o report statistics for facsimile transmitted since the last time faxcron was run. o report statistics for facsimile transmitted in the past week. o report statistics for facsimile received since the last time faxcron was run. o report statistics for facsimile received in the past week. o report any recent calls that failed suspiciously and return the associated trace log; o purge data that is 30 days or older from the remote machine information directory; o delete information that is 30 days or older from session trace log files; o remove files from the tmp directory that are older than 1 day; o remove files in the received facsimile queue that are 7 days or older; o report sites that are currently having jobs rejected; and o force all session log files to be owned by the fax user and kept with protection mode 644. OPTIONS
-n Forces faxcron to run without updating any files. -l lastrun Forces the notion of the last time that faxcron was run to be lastrun. The value of lastrun is a date and time string of the form ``MM/DD/YY HH:MM'' (the date(1) format string ``%D %H:%M''). -info n Set the expiration time for data in the info database to be n days. -log n Set the expiration time for session log data to be n days. -rcv n Set the expiration time for files in the received facsimile queue to be n days. -tmp n Set the expiration time for files in the tmp directory to be n days. -mode m Set the file protection mode for session logs to m (a command line argument to chmod(1)). NOTES
This script requires nawk(1) or gawk(1) and a date (1) program that supports the ``+format'' option. If session logs are to be kept private this script must be modified to filter out sensitive information such as calling card numbers. (It should also be run with ``-mode 0600'' so that session log files are not publicly readable.) FILES
/var/spool/hylafax spooling area /var/spool/hylafax/status/lastrun timestamp of last run /usr/sbin/xferfaxstats for generating transmit statistics /usr/sbin/recvstats for generating receive statistics /var/spool/hylafax/tmp/faxcronXXXX temporary file for truncating session logs /var/spool/hylafax/tmp/faxlogXXXX temporary file for logs of failed calls SEE ALSO
cron(8), faxq(8), faxgetty(8), faxsend(8), xferfaxstats(8), recvstats(8), hylafax-server(5) May 12, 1996 FAXCRON(8)
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