10 More Discussions You Might Find Interesting
1. UNIX for Beginners Questions & Answers
Just learning about the privilege escalation method provided by setuid. Correct me if I am wrong but what it does is change the uid of the current process to whatever uid I set. Right ?
So what stops me from writing my own C program and calling setuid(0) within it and gaining root privileges ?
... (2 Replies)
Discussion started by: sreyan32
2 Replies
2. Shell Programming and Scripting
Hi,
I have a script, 'transfer_file' that has setuid permissions set and is running on Solaris 9 and 10.
From within this script I need to run a sftp command to transfer a file to a remote server. The public keys of the script owner have been transferred to the remote server and files and remote... (1 Reply)
Discussion started by: stv_t
1 Replies
3. Solaris
I have a user AAA who's who is part of a group call clserv and techsupp, His userfiles have the following permissions:-
drwxrwx--- 16 AAA clserv 1858 Aug 22 12:48 UserFiles
he has a link in his UserFiles/
lrwxrwxrwx 1 root root 36 Mar 9 2013 TECHSUPP_GLOBAL... (5 Replies)
Discussion started by: kilobyter
5 Replies
4. Shell Programming and Scripting
Hi,
I have the following 3 test files to test setuid bit which if it works I would like to implement in our application. However setuid doesnot seem to be having any impact on my test below.Following are the 3 files of interest in /tmp/ folder.
$ ls -ltr *env*
-rw------- 1 g332008 users 6... (23 Replies)
Discussion started by: waavman
23 Replies
5. Shell Programming and Scripting
Hi Guys,
I'm a DBA and need help on shell scripting.
My Oracle Database is sitting on HP-UX machine.
Anyone has a script that can spool out permission of all oracle binary files in the below directory:
/opt/ora10g/oracle/
Format to be spooled out : chmod <exisiting permission> filename... (10 Replies)
Discussion started by: ciaciachew
10 Replies
6. Solaris
Hi
I am trying to automate the install of a package, I realise that I need to create an admin file, but as part of the install I am asked if I want to install these as setuid/setgid files, I want to say yes.
What value am I supposed to use for setuid= in the admin file
Thanks (1 Reply)
Discussion started by: eeisken
1 Replies
7. Shell Programming and Scripting
How to execute a script with out giving x permission to the file? (7 Replies)
Discussion started by: praveen_b744
7 Replies
8. Shell Programming and Scripting
In my script, I am creating a file ----> then writting one line (i.e. Timestamp) ----> then FTP'ing. The same script can be executed by many other users.
While other users executing this script, they couldn't Over write this one line (i.e. Timestamp)
My expectation
So I wanted to create a... (2 Replies)
Discussion started by: sbmk_design
2 Replies
9. Shell Programming and Scripting
Hi all,
I need one script, that will give the out put like all files having 777 permissions and full path from home directory.
example:i created 777 permissions files three in my home directory and subdirectories also. i want out put like
./xxxxx/aaa.txt
./xxxxx/zzz/yyy.txt
... (3 Replies)
Discussion started by: krishna176
3 Replies
10. Shell Programming and Scripting
Hi,
I have a script (a.pl) that can be run by anyone. The script internally has to read a file and write into few files which are owned by user 'myUser'.
Has to read the following file:
-rwx------ 1 myuser myuser 4986 Aug 20 18:11 my.file
Has to write into following files:
... (0 Replies)
Discussion started by: sarmakdvsr
0 Replies
SETUID(2) Linux Programmer's Manual SETUID(2)
NAME
setuid - set user identity
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int setuid(uid_t uid);
DESCRIPTION
setuid() sets the effective user ID of the calling process. If the effective UID of the caller is root, the real UID and saved set-user-ID
are also set.
Under Linux, setuid() is implemented like the POSIX version with the _POSIX_SAVED_IDS feature. This allows a set-user-ID (other than root)
program to drop all of its user privileges, do some un-privileged work, and then reengage the original effective user ID in a secure man-
ner.
If the user is root or the program is set-user-ID-root, special care must be taken. The setuid() function checks the effective user ID of
the caller and if it is the superuser, all process-related user ID's are set to uid. After this has occurred, it is impossible for the
program to regain root privileges.
Thus, a set-user-ID-root program wishing to temporarily drop root privileges, assume the identity of an unprivileged user, and then regain
root privileges afterwards cannot use setuid(). You can accomplish this with seteuid(2).
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EAGAIN The uid does not match the current uid and uid brings process over its RLIMIT_NPROC resource limit.
EPERM The user is not privileged (Linux: does not have the CAP_SETUID capability) and uid does not match the real UID or saved set-user-ID
of the calling process.
CONFORMING TO
SVr4, POSIX.1-2001. Not quite compatible with the 4.4BSD call, which sets all of the real, saved, and effective user IDs.
NOTES
Linux Notes
Linux has the concept of file system user ID, normally equal to the effective user ID. The setuid() call also sets the file system user ID
of the calling process. See setfsuid(2).
If uid is different from the old effective uid, the process will be forbidden from leaving core dumps.
SEE ALSO
getuid(2), seteuid(2), setfsuid(2), setreuid(2), capabilities(7), credentials(7)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2010-02-21 SETUID(2)
