Ubuntu Security :: Advance User Setting Shell
Jun 22, 2011
As I was researching on how to create a kiosk Ubuntu setting I came upon a suggestion to create the user with '/usr/bin/screen' shell option.Hope you all would forgive me for this noob question but what does this mean? I saw when I checked the Advance Settings Advance tab that there are a couple of possible options there, what do they mean and how will they affect the user profile I'm creating? I tried google for this and if my understanding is correct, these shells are suppose to be programmable and a scripting language for linux but I'm confused on what effect this has on the user profile I'm creating?One thing I notice though is that with the '/usr/bin/screen' option, the user account is refused of the Applications > Accessories > Terminal option.When I googled each one of the options I'm getting more confused as to the relevance of this to the user profile.
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Mar 19, 2010
I wanna make a small web server for local use , I've installed apache, every thing works fine I'm the root
I wanna protect the folder that contain the htdocs files (www), i don't want any users that not in root group to access (not even read)
I changed the permission of the htdocs folder as next
Owner: www (apache user)
per: creat , delete
group: root
per: creat , delete
other: none
it only works on the main folder that i changed its permissions ! not all sub folders and files ! were my steps right ? and are their anyway to change all folders and files at once ?
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Mar 17, 2010
I'm currently creating a simple sh file which will copy the contents of a certain directory to / directory. in my sh file:
Code:
cd "$DIR"
for i in *.*; do
sudo cp -iv "$i" "$DEST"
done
but this requires user password. can i add the user password in my sh file? how? I'm trying to do this because I have an application to run the sh file and the application has no way to enter the password..
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Apr 16, 2010
I want to limit what a authenticated user can do on my Linux server. I've set the default shell to rbash, but I know a knowledgeable user can switch shells. Can I use file permissions to deny execution rights to /bin/bash to anyone who is not in a particular group? And if that works, how do I find out what other shells are installed on my server (Ubuntu 9.10)?
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Mar 18, 2010
I wanted to set up Computer Lab. loading Fedora 11 OS and one system acting as a Server to store Users(Student) Login Informations. When students do a programs, all programs (eg, C++ programs) files should be saved in the local fedora system but when login to the system, the login should be validate by a Server System.
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Mar 8, 2011
i am looking for "shell script" book from basic to advance. since i am novice in linux i want to play around with it
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Jun 15, 2011
MACHINE: HP Proliant DL260G5OS: SLES 11 SP1kernel: Linux xserver 2.6.32.12-0.7-default #1 SMP 2010-05-20 11:14:20 +0200 x86_64 x86_64 x86_64 GNU/LinuxIt is used as remote xserver in a LAN.I have configured /usr/lib/restricted/bin/.rbashrc with some environment variables but when the users logon in the system finally is executed $HOME/.bashrc and some environment vars are overwritten.
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Feb 25, 2010
I've looked everywhere but I can't find where to change the default box for incoming mail, or am I on the wrong track. It's a nuisance having to change folders and I can't configure wastebin to empty on exit.And I can't get kmail to import from evolution. Do I have to go to the evolution storage and do it manually, and if so, how do I do that?
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Dec 11, 2009
I am using the sudo command to log on locally as another user by the following command:
sudo -u theotheruser -s
or
sudo -u theotheruser sh
As I see it, this initiates a new shell with the mentioned other user.However, this doesn't load that users profile from his home directory.Is there a way to automatically read the users profile when login in with selected command? I am mostely interested in getting a working prompt when logged in.
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Feb 3, 2010
Is there a way to delete files on the commandline that uses the KDE-Wastebin?It appears that I never ever need the KDE4 Wastebin for files that I deleted through Konqueror or Dolphin. It is only when I delete files on the konsole with rm that I wish I could undelete them. It always happens like that, mostly by being in the wrong directory or using a wildcard when I should not have. (I don't have any erroneous deleted file right now, and I do have plenty of backups, but I just wonder whether there is something better than rm to use generally on the commandline.)
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Mar 31, 2011
Is there a way to make it so that opening an executable text file will automatically run, rather than prompt me to run, edit, or something else?
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Jul 12, 2010
I'm running into a problem when I try to set a variable to an awk output in c-shell. Right now my command is Code: set STR_MSG_TYPE = `awk -F{ '/msg_type/ {print $2}' <filename> | tr -d }'/''*' ` I then run echo to see what the output is and it returns blank, however, when I run the same awk command from the command line, I get an actual output of "MT-715". Am I setting my variable incorrectly? I do something similar using the date command to set a STR_DATE variable earlier in the code and it works fine and I use the same syntax.
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Aug 10, 2010
I'd like to keep root pw==sudo pw==user pw on a box with Code: $ lsb_release -ds Ubuntu 9.10 $ uname -rv 2.6.31-22-generic #61-Ubuntu SMP Wed Jul 28 02:02:56 UTC 2010 Just now it hung going to sleep, so I shutdown via BRS. On cold boot, HD mount failed and I got the prompt to hit Esc to goto maintenance shell. I did that, got the prompt for the root password, and entered my sudo.
That failed! though it has worked before ... but I changed my user password on that box recently, and I'm pretty sure I haven't needed to fsck between then and now. I'm wondering: What do I need to do to set my root pw? I was able to C-d out of the shell, and karmic took care of itself, but I'd prefer not to rely on that. Is there a way to make my root pw always equal my user pw? If so, is that a Very Bad Idea?
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Feb 2, 2011
created a user but i forgot to change the home directory permission.so after user created when i go to the user and group mangement i cant see that permission filed related to the home permission directory.my purpose is to stop accessing other user to my home directory,how it can be possible??
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May 10, 2010
I have an RHEL 5 server joined to a windows domain. However I wanted to add variable lines to be executed each time a user logs in. However I succeeded to put them in /etc/bashrc file and it worked like a charm.
But its annoying that everytime the user logs in to the shell remotely it displays the whole variables that were declared. Is there a way how to add them once and not to display the output each time the user logs in?
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Apr 15, 2009
I've been looking for this feature for months and couldn't find a solution for this. Does anyone know how to create users and limit the user to a specified directory?
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Feb 11, 2010
I'd like to set up a shell script that will send various emails at regular intervals through gmail. I'm sure that there is some sort of text-based email client out there, but I'd like to do this with cron or anacron. I know a little bit of shell scripting but am definitely not great at it.
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Jan 4, 2011
I've been looking around the net for executing a shell script. My basic understanding is that after setting executable permissions and providing a path (#!/bin/sh) in the first line of the script, I can type ./myscript to execute instead of sh myscript. This is not working for me. I can run "sh myscript" but not "./myscript" even though I know for sure I have across the board execute permission and my sh path is correct. I'm working on a redhat linux station.
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Feb 2, 2011
What security mechanisms are used by recent versions of the Linux operating system during user authentication?
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Apr 8, 2010
I just added a new user to my ubuntu by:
useradd -gdevelopers -d/home/peter -m peter
when peter logs in (after I created a passwd for him) he doesn't see the shell as I do:
me:
adhg@server:~$
peter
$
ALSO, he can't user the TAB to move inside a folder (when you type cs /home/p and use tab to get /home/peter)
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Apr 26, 2011
The short version: I have to manage some virtual machines using php shell_exec function, so far I cant do this because apache is run by the user www-data and virtualbox by the user vboxuserFrom what I've read so far, I've thought of 3 possible solutions: 1.- Create a script on my vboxuser that I can call from php to manage the Virtual Machines.2.- Change the apache user from www-data to vboxuser so I can manage the Virtual Machines through php
3.- Reinstall VirtualBox, this time using www-data as my user. I'm not sure if any of these will work and I'm not too sure of which would be the best solutionNow the longer more detailed version:
I have a remote server running Ubuntu 10.04.2, in that server I have set up VirtualBox so I can run several instances of WinXP to perform different tasks. Everything is setup and I can manage the virtual machines through SSH. If I want to run them as a different user than the one that created them (a user that so far only has been used to create the Virtual Machines) I have to do sudo -u vboxuser.Now, I need to create a PHP script to manage these virtual machines (I know about phpVirtualBox, but it's not what I need). If I try to run the virtual machines using shell_exec() from php, I get no answer at all (And I have tested that shell_exec is working on my server).
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Feb 28, 2010
I'm using ubuntu and i need to know if it is possible to make a "prototype" account that sets the defaults for new users when a new account is made. How would i go about doing this. I would like to have the same start up programs, panel, themes, background, etc...
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Nov 30, 2010
When I add a new user and SSH to my server as that new user, my command prompt is just a '$'. Tab completion doesn't work either. What I notice is that I get this:
Could not chdir to home directory /home/scaldwell: No such file or directory
$
Echo PS1 yields nothing. There is also nothing in /etc/skel. I didn't have to do anything special to get my initial user setup with the right prompt, and the second user has been added to the admin group as well. I have noticed that if I issue the command sudo chsh -s /bin/bash the account gets the correct prompt.
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Jan 25, 2011
I am running Ubuntu Server 10.04 and I just created a new user. Everything works great except the new user's SSH shell can not do certain things.
For example, I cannot arrow up for previous commands on the new user. I just get "^[[A" when I try that. (I can do this on root.)
It also looks different on root versus the user, look:
Code:
Code:
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Feb 9, 2011
I am learning exploit development and learning some stuff about shellcodes now! The shellcode is absolutely right and have tested it. I am using the following code...(created by me) to run my shellcode..
Code:
// #include<stdio.h> we will not be needing this as we are not using any functions from the C library...Just basic logic of Pointers..
char shellcode[] = "x31xc0xb0x01x31xdbxb3x07xcdx80"; // basic exit shellcode
int main()
{ int *ret; // a simple integer pointer pointing a address
ret = (int *)&ret + 2; // change the address pointed by
(*ret) = (int)shellcode; }
Compiling :-
Code:
aneesh@aneesh-laptop:~/articles/C$ gcc test.c -o test -fno-stack-protector
Compiling gives no errors as expected..
Now the problem I am facing is that As I run the program :-
Code:
aneesh@aneesh-laptop:~/articles/C$ ./test
Segmentation fault
Strace output :-
Code:
aneesh@aneesh-laptop:~/articles/C$ strace ./test
execve("./test", ["./test"], [/* 37 vars */]) = 0 .....
set_thread_area({entry_number:-1 -> 6, base_addr:0xb78016c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0xf5e000, 8192, PROT_READ) = 0
mprotect(0x8049000, 4096, PROT_READ) = 0
mprotect(0x15c000, 4096, PROT_READ) = 0
munmap(0xb7802000, 81274) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Segmentation fault
I have some feeling that its because the program has no access to the memory containing the shellcode (May be???)..
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Feb 18, 2010
Im want to know the command to add a user with no shell access so they cannot log onto the system, but there a user on there so for example they can be part of the email server.
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May 27, 2010
I have a program I want to run as it's own user. But I don't want anyone to be able to login as that user, so I created a user like: -
useradd -s /sbin/nologin someuser
How do I run a specific program owned by this user as this user? I can't su to this user as it doesn't have a shell.
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May 3, 2010
I am running few tasks in my linux console and want to be notified by some kind of alarm, so I don't keep checking the progress of the task.
Is there a way to customize the alarm by specifying additional filters like "ERROR" message, etc? I think it will be a useful thing to have.
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Mar 11, 2010
I've setup a Moodle server on 9.10 server, and have been able to share user folders back to the windoze machines on the home net. What I'd like to do is share the Moodle main folder (and descendents) likewise. The problem is that it's owned by root. For ther user folders, as long as the owning user was logged in they were able to mark the folder as shared and everything worked very smoothly. When I try to mark the moodle folder as shared, no suprise I get a permission error. Is there a way of doing a "sudo su" from the GUI desktop to allow this to happen? Or do I have to set up the share from a command line (after having done a sudo su)? Can anyone give me the magic commands needed to do such?
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Sep 13, 2010
I have a HTPC that launches XBMC standalone automatically, but want to be able to quit and login as a normal Gnome user. I heard that you can set a default Window manager to the user. How do you do that?
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