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Cannot Run Seteuid

On top of that, we add the setting of the positional parameters ($1, $2...) based on the value of the $_a array (see below), and some clean up so that the Content copyright © 2007-2010, the authors Daemon image copyright ©1988, Marshall Kirk McKusick FAQ Forum Quick Links Unanswered Posts New Posts View Forum Leaders FAQ Contact an Admin Forum Community Forum Hosted by Red Hat. Also note that if you do: SWITCH_TO_USER alice SWITCH_TO_USER bob SWITCH_TO_USER root That only works if you have the right to sudo as alice and alice has the right to sudo

Like for $UID, unless you set $USERNAME to root, there's no coming back, but like for $UID, you can change the user only for a subshell. GNOME.org Home Mailing Lists List Archives Search [gdm-list] login problem: "Cannot run seteuid to 0: Operation not permitted" From: Renato Budinich To: gdm-list gnome org Subject: [gdm-list] Karl -- Karl F. Your choices are (1) call the (no longer) depreciated setreuid() functions, (2) call the non-portable setresuid() function, or (3) do a setuid(uid_of_beth) and then use execve to run a program which

Count trailing truths What was Stan Lee's character reading on the bus in Doctor Strange How do pilots identify the taxi path to the runway? bash doesn't have any such way to change the user ids. OpenBSD restricts the types of signals that can be sent to set-uid processes.

asked 4 years ago viewed 12706 times active 4 years ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Linked 1 Exec program that needs sudo privilages Related 1Linux group It is often useful for root programs to become other users, to ensure that nothing is done that couldn't be done by that user. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Hours of google searching hasn't helped much, but here is a link to a page that describes a problem as similar to mine as I could find: http://forum.tinycorelinux.net/index.php?topic=195.0It mentions this: BTW,

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Total distance traveled when visiting all rational numbers Do humans have an obligation to prevent animal on animal violence? Systems without saved UIDs are pretty much extinct. (NextStep was the last one I saw). https://ubuntuforums.org/showthread.php?t=946033 addFieldToFilter() And Condition in magento2 What was Stan Lee's character reading on the bus in Doctor Strange What's the name of style where GM assumes idiotic behaviour unless stated otherwise?

Strength check between medium size and large size more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us You can work around this by calling an exec function to a shell that does not perform these checks, or writing all of your code in C (no shell calls) - Query that converts timestamp to Date Typesetting text with math Operator ASCII art How do fonts work in LaTeX? Underbrace under nested square roots Why do languages require parenthesis around expressions when used with "if" and "while"?

Linux only. Many distibutions of Linux, for example, have checks in shell invocation to prevent a script begin run setuid or seteuid. Suppose we want to let users to append messages to a log file, but not edit the file. We permit the log file so only logger can write to it, and we make the program so it runs set-uid-logger.

setuid(uid) If your effective UID is root, the POSIX version still works as described above, setting all three UIDs to the given values, thus transforming you permanently into the give user. What that means is that it has to be written exactly like stat, with SWITCH_TO_USER at the beginning of the line and with exactly one space between arguments. Last edited by cubisttriangle (2012-01-22 22:45:03) Offline #2 2012-01-22 22:22:12 smudge Member Registered: 2011-03-20 Posts: 141 Re: [SOLVED] Sudo and seteuid issues Try, in a terminal:whereis Xorg Xorg: /usr/bin/Xorg /usr/share/man/man1/Xorg.1.gz ls The child is responsible for validating all directives it receives.

bash doesn't have provision for changing users, but zsh does. Ubuntu Logo, Ubuntu and Canonical Canonical Ltd. You can. –user405725 Feb 15 '12 at 16:50 1 To further clarify Petesh's remark - getting root permissions back requires more complexity (you basically have to switch the euid and I attempt to run GDM or startx within x windows - using xterm and I get the following rrrors: startx command: xauth: file /home/saint.serverauth.8794 does not exist fatal server error: Server

Browse other questions tagged c linux security setuid or ask your own question. That is, they dump the definition of all variables, functions, aliases and options as shell code ready to be evaluated. In AIX, setreuid(a,b) (where a!=b) is equivalent to seteuid(b) and setreuid(b,b) is equivalent to setuid(b).

So for instance: exec 3> some-file SWITCH_TO_USER bob echo test >&3 will typically not work.

We need to do # that because as a non-priviledged user, we can't set our euid # to anything else. The root user and the appz user. The effective UID is used when checking whether the process can open a file. Usually, you can change your euid between your real userid and the saved set user id (if called from a setuid executable) or change to anything if your euid is 0.

POSIX-ish Functions The 1990 POSIX standards continued this direction of evolution, but some new complications were added, mainly in that the functions act quite differently for root than they do for The simplest way to do this is to make the applog program an set-uid-root program, and permit the log file so only root can write it. On the initial script invocation, it will be cancelled (see below). Browse other questions tagged c linux security setuid or ask your own question.

Search Forums Show Threads Show Posts Tag Search Advanced Search Go to Page... addFieldToFilter() And Condition in magento2 Default value for date field Did a thief think he could conceal his identity from security cameras by putting lemon juice on his face? That function does the bulk of re-executing the script. There is a risk that it will be missing in some systems that conformed to earlier versions of POSIX.

The idea in the script above is upon a call to SWITCH_TO_USER, to execute a new bash instance to execute the remaining of the script. Is privacy compromised when sharing SHA-1 hashed URLs? Now, where it gets hacky is that we use the fact that bash expands aliases very early in its parsing process.