Visit Our UNIX and Linux User Community


Changing effective user


 
Thread Tools Search this Thread
Special Forums Cybersecurity Changing effective user
# 1  
Old 09-18-2001
Changing effective user

I would like to give execution rights for a script to one user. (that's the easy part...)
When that user is running the script, I would like the effective user ID to be that of the file-owner. Is this possible?
# 2  
Old 09-18-2001
Yes, try looking up the manpage for chmod. What you want is to set the "sticky bit" on the file.

It may be a little tricky to get the script only executable by only one person and to have it set uid, but it can be done through the use of groups.
# 3  
Old 09-18-2001
oops

In many cases, modern shells will not let you run a script setuid, only a binary...

You might need another way.

Any suggestions from anyone?
# 4  
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.
# 5  
Old 09-19-2001
Oops, I got +t and +s mixed up again...
Probably not a good thing to do very often, no?
# 6  
Old 12-05-2001
Data Where could i find "sudo"

Does anybody knows were could i find this "sudo" program or could point me on an easy way to execute commands inside a script being a different user.



Quote:
Originally posted by Perderabo
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.
# 7  
Old 12-06-2001
http://www.courtesan.com/sudo/

If you want to log in to another server within a script (I have a feeling this will be the next question) , and as long as you're not too worried about security, check out http://expect.nist.gov for Expect and samples. Also, search this site for .netrc .

Have fun!

Previous Thread | Next Thread
Test Your Knowledge in Computers #752
Difficulty: Medium
BIOS is an acronym for Bootstrap Input/Output System.
True or False?

10 More Discussions You Might Find Interesting

1. Programming

Real, effective and saved user id in C program

I figured it out by now. (0 Replies)
Discussion started by: Ralph
0 Replies

2. Shell Programming and Scripting

Prevent the user from changing his directory

Hi could some let me know how to prevent user from changing his home directory....... Thanks in advance.... (1 Reply)
Discussion started by: Revanth547
1 Replies

3. Shell Programming and Scripting

User id who is changing the script.

can we know the user id who changed saved script in cron tab..:D (7 Replies)
Discussion started by: netdbaind
7 Replies

4. UNIX for Dummies Questions & Answers

[Solved] effective user id upon exec

Hello all. Despite the exec man page, the exec system call seems to turn my effective-user-id into my real-user-id. I coded and compiled 2 very simple c programs as user 1 (uid=501) The first one (A) prints real and effective user IDs and then execs the second one (B), which in turn prints... (7 Replies)
Discussion started by: oviv
7 Replies

5. UNIX for Dummies Questions & Answers

Changing the user id or euid of the shell itself

Hi all, Ok, bear with me on this one, I am a bit new to Unix and it might take me a little bit of time to articulate my question. I know that every process has a user id and an effective user id. This seems to include the shell itself, because when I type 'ps', I see 'bash' listed as a... (2 Replies)
Discussion started by: oddthingy
2 Replies

6. Solaris

Solaris user changing password

i created 1 user . Now its passwd time period get expired. Now how can I set password for that user. Also how can I set a condition such a way that after every 3 months user must change his passwd. (5 Replies)
Discussion started by: ajitkraj
5 Replies

7. AIX

Changing User Characteristics

We use smitty to administer user accounts. Is it safe to make changes to the characteristics of a user while the user is logged in? Can I set "Is this user ACCOUNT LOCKED?" to true ? Can I set an expiration date on an account? Will this effect the user in anyway during their current... (1 Reply)
Discussion started by: andrewsc
1 Replies

8. AIX

changing user password

I have 02 servers: - Linux RHEL AS 3 (server1) - AIX 5.2 (server2) Running the command rsh server2 passwd derje from the server1 to change derje user password on server2, give me this error: 3004-709 Error while changing the password for "derje" Can somebody help me ? (0 Replies)
Discussion started by: mayge
0 Replies

9. UNIX for Dummies Questions & Answers

Changing the Effective Group ID

Here is my situation. On a RedHat 7.3 box, I have a user named jody. When I log in with jody and type in "id", I get the expected output: uid=1(jody) gid=1(jody) groups=1(jody), 510(test) However, I cannot figure which "id" option allows me to change the effective gid. I tried the options... (2 Replies)
Discussion started by: Jody
2 Replies

10. UNIX for Advanced & Expert Users

Changing permissions of a user

So I need to change the permissions of my user account. I can access the root account on the server, but don't know how to change the permissions of my user account. I was advised to try 'userconf' to see if I am part of a group, but I dunno how that works. ANyone who knows how to see the... (3 Replies)
Discussion started by: achink125
3 Replies

Featured Tech Videos