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Full Discussion: Changing effective user
Special Forums Cybersecurity Changing effective user Post 7060 by Perderabo on Tuesday 18th of September 2001 09:56:28 AM
Old 09-18-2001
It suid bit controls the switch of the effective uid. The sticky bit has nothing to do with it. And modern kernels will ignore the suid and sgid bits when executing scripts.

There is a program called "sudo" that can let a user run a script with another uid's authority. That is what I would recommend. sudo is a public domain program available from various archive sites.
 

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SXID(1) 						      General Commands Manual							   SXID(1)

NAME
sxid - check for changes in s[ug]id files and directories SYNOPSIS
sxid [ --config <file> ] [ --nomail ] [ --spotcheck ] [ --listall ] DESCRIPTION
Sxid checks for changes in suid and sgid files and directories based on its last check. Logs are stored by default in /var/log/sxid.log. The changes are then emailed to the address specified in the configuration file. The default location for the config file is /etc/sxid.conf but this can be overridden with the --config option and specifying an alternate location. OUTPUT
The program outputs several different checks concerning the current status of the suid and sgid files and directories on the system on which it was run. This is a basic overview of the format. In the add remove section, new files are preceded by a '+', old ones are preceded by a '-' NOTE: that removed does not mean gone from the filesystem, just that it is no longer sgid or suid. Most of it is pretty easy to understand. On the sections that show changes in the file's info (uid, gid, modes...) the format is old->new. So if the old owner was 'mail' and it is now 'root' then it shows it as mail->root. The list of files in the checks is in the following format: /full/path *user.group MODE (MODE is the 4 digit mode, as in 4755) In the changes section, if the line is preceded by an 'i' then that item has changed inodes since the last check (regardless of any s[ug]id change), if there is an 'm' then the md5sum has changed. If a user or group entry is preceded by a '*' then it's execution bit is set (ie. *root.wheel is suid, root.*wheel is sgid, *root.*wheel is +s). On the forbidden directories, if ENFORCE is enabled an 'r' will precede forbidden items that were succesfully -s'd, and an '!' will show that it was unsuccesfully -s'd (for what ever reason). OPTIONS
-c, --config <file> specifies an alternate configuration file -n, --nomail sends output to stdout instead of emailing, useful for spot checks -k, --spotcheck Checks for changes by recursing the current working directory. Log files will not be rotated and no email sent. All output will go to stdout. -l, --listall Useful when doing --spotcheck or --nomail to list all files that are logged, regardless of changes. AUTHOR
Ben Collins <bcollins@debian.org> REPORTING BUGS
Report bugs to current maintainer Timur Birsh <taem@linukz.org>. SEE ALSO
sxid.conf(5) sXid 4.0.5 January 2002 SXID(1)
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