Programming :: System Administrator Wants To Change The Privilege* Only To Users 1, 2 And 3 To Execute The File /bin/xxx?
May 1, 2010
due to an exercise in Operating Systems I have to do the following: There are 6 users, user1, user2 ... user6 with home directories /users/user1 ... users/user6. User1 to user3 belong to group1, user4 to user6 belong to group2. The System Administrator wants to change the privilege* only to users 1, 2 and 3 to execute the file /bin/xxx. Which are the commands he has to type in order to achieve the previous?*I'm not sure if this is the right translation.What I have come till now is: Code: $ chgrp group1 <name_of_file> but it seems too simple to be right.
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Jul 24, 2011
I have been wondering if a guest user could compromise a machine which is set in the following way: they are not able to open the computer case, to boot from either an USB flash drive or an optical-disc drive, nor have any knowledge of the administrator-user password. Thus, they are landing on their guess account, and have to work their privilege escalation from there.
Therefore, what can they do to gain it? Could they download or otherwise install or run from a thumb drive an application that could be used to crack the administrator-user password? Because, it seems to me, could they enter into the system such a password-cracking application, the whole system could be compromised given the administrator-user password contains less than 9-or-so characters. What do you think? Can I lend my computer to anybody without them having beforehand gained my trust in them? Is the reasoning reasonable?
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Jan 5, 2011
I am trying to setup a system to allow normal users to execute a command without using sudo. Is this possible?
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Mar 2, 2010
everytime I try to enter any of the admin controls ie update manager etc the window opens for a split second then crashes also if the sound is turned up or down via keyboard shortcut the sound bar starts flashing very fast and the keyboard becomes inoperative, I have tried rebooting etc with no avail, I have done everything that I can with my very ltd knowledge, this first started after the last update I am using 9:10 KK.
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Dec 1, 2010
Currently as a part of an assignment I need to implement a reverse shell on a linux system. The system details are -Quote:Linux Kernal Version - 2.6Database - MySQLUsing web-server I could upload a php file which could execute the command on behalf of me. Now, I want to get root access so that I can get access to system's core files.My sample php file -
PHP Code:
<?php
if((!empty($_GET['cmd']) && isSet($_GET['cmd'])))
[code]....
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Sep 26, 2010
im trying to execute a file. When I try i get the message:
The file ...Installer.exe is not marked as executable. If this was downloaded or copied from an untrusted source, it may be dangerous to run...
So when I right click on the file and select properties>permissions and check the 'allow executing file as program' it instantly unchecks the box. I can't check the box.
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May 31, 2010
I just got a fresh Ubuntu 10.04 install on a system, added Lubuntu (the poor thing's 10 years old), and added a second user and gave him sudo/admin rights via the Users and Groups app. All was working fine, but now the initial user can't make any system changes. The initial user can still execute sudo and gksudo, but not much else.
In the Network Connections applet, the initial user can't edit the "Auto eth0" connection, the "Edit" and "Delete" buttons are just greyed out.
In User and Groups, I can click "Advanced Settings" or "Change" on another user, but nothing will happen. If I click "Add User" as the initial user, it will give the "Not authorized" popup.
I had a second user that I'd given adminstrator/sudo access to. So to change the network settings I logged in as this user for the first time, and was able to change some things. However, after a reboot I had the same problems with this new account.
I haven't done anything with this install besides install openssh-server, add some firewall rules with ufw, and add the Lubuntu desktop. Most of my google results turned up basic stuff like corrupted sudoers file (mine is still in pristine, default condition), and not being part of the admin group (which both users still are). The behavior also persists regardless of whether I use gnome or Lubuntu for my session.
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Jun 16, 2010
I've checked out a subversion project with source c++ files in netbeans 6.8 on Red Hat 5.5. My machine has a dual boot with windows xp and RHEL 5.5 so I checked out the project on a folder called winshare which is a shared drive/partition (E: under xp) allowing both operating systems to access the contents. I've Fedora as virtual machine on xp and wanted to be able to work on the source seamlessly whether using fedora or RHEL.
Problem is that Netbeans is able to build the source just fine but I can't seem to run the generated executable. It has -rw-rw---- permission and the owner is the same user logged in (let's say user1) but no matter what I do, whether I change permissions as user1 or root issuing command chmod 777 -R /dir/where/file/is does not have any effect whatsoever on the executable as well as any .cpp or .h files (nothing that I need exectue permissions on .cpp but just to make a point).
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Feb 19, 2014
I was writing code to execute system command, using GDM3 an logged in as root (just commented line #auth required
pam_succeed_if.so user != root quiet_success , in /etc/pam.d/gdm3).
When i execute:
Code: Select allvoid criarWindowsDialog::on_pushButton_2_clicked() {
  ui->commandTextEdit->append("Processo iniciado ...");
  QProcess processo;
  QString comando;
  QStringList args;
  QString fullCommand;
  QString stdOut;
  QString stdError;
[CODE]..
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Feb 11, 2011
I'm trying to compile a simple script for a ar71xx (bleeding edge /from snapshots) Openwrt router.I have previously compiled scripts for Kamikaze 8.09. I just copied the gcc file inside the SDK dir and used it without problems.
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Apr 7, 2010
I am trying to execute a 4GE file using command something like this "/usr/bin/ksh path of the file with some arguments " ex: /usr/bin/ksh /home/abc.4ge S "./xyz" . I am able to execute the 4GE without this "/usr/bin/ksh" specifying in the command which basically runs in ksh shell itself. But when i try to run it exclusively using the path of the shell it gives me an error something like this "/usr/bin/ksh: /home/abc.4ge: cannot execute". I did check the permissions and all the file has execute permission.
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Feb 4, 2010
I want to create a webpage where users can change their samba password and before I jump to PHP code i want to write perl code that can be called in php code.I have created two file 1. main.pl - this script actually switch user and call passwd.pl2. passwd.pl - this is actually changes the password {main.pl}
#!/usr/bin/perl
my $username = $ARGV[0];
my $oldpass = $ARGV[1];
[code]....
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Apr 18, 2011
I have a useradd script that can be found here: [Bash] #!/bin/bash #useradd script while true; do echo Please Enter First Name - Pastebin.com.I need to add users that have the same name, while keeping with the current scheme, I'd just like to have numbers at the end of the user, for example joeuser, joeuser1, joeuser2... Basically, keeping with the current naming scheme, I would like to modify the script to automatically add a number to the end of the username when I have users that have the same name.
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Feb 3, 2011
I have a box that's used as an SFTP server. All users have restricted shell so they can only use SFTP to send and receive files. But it makes it hard to have them change their passwords. I thought that if we had a web page set up where the user could enter their username, old password, new password and confirmed new password, that this would be the easiest solution.
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Sep 24, 2014
I am having trouble writing a script that monitors a text file. When the file contains number 1 (or any other string that is not a command) it does nothing, but when it is something different from 1, it executes that command.
So, there are 2 files: monitor.mon - this is the file that will be checked constanlty; and test.sh - the script that does the job. The monitor.mon file will have its content modified by php. This means a web page will have a form where I input commands and writes does commands in the file. Test.sh will watch when the file's content changes from character 1 to a command, execute that command and write back a 1 so it will not execute it more times.
I tried combining while and if but with no success. Tried reading the file with cat and grep -e but it doesn't seem to recognize when content changes.
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Sep 10, 2010
I hava a source file add.c
int add(int a,int b){
return a+b;
}
then i compile it, gcc -c add.c now we get a object file add.o, I want to execute the function add(int a,int b)(the functinon in the object file add.o) how can i use libbfd to execute it?
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Oct 23, 2010
I have a MP3 player which is owned by Root. I have tried the following: in terminal - chown as both my usual log-in and root operation not permitted. I ran chown as both su, root, and myself. In Nautilus - I can't change any of the file attributes again opening it as any of the users above. I used to be able to copy files over to the MP3 player but not the Sandisk but not I can't copy or do anything to the files on both.
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Mar 7, 2010
I have been trying to install the drivers for my Egalax Touch Screen. I keep getting the message that I do not have permission, and at the end it says "are you root?" I have searched topics on the internet, then remember Linux.
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Apr 23, 2011
I am trying to execute command mactime in order to control changes made to the file system, but I am getting an error. I am running the shell as root, and it is the first time I run the command in this system - Debian Squeeze up to date. The I/O is as follows:
# mactime 3/1/2011
cannot exec /bin/date: No such file or directory
cannot exec /bin/hostname: No such file or directory
cannot exec /bin/uname -n: No such file or directory
Cannot open /var/cache/tct/data/Amnesiac/body: No such file or directory
The first three lines of output are the ones that are worrying at the moment; I am not concerned with the last. Although error messages suggest the programs date, hostname and uname do not exist in /bin directory, they are available as shown by
[Code]...
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Jul 6, 2010
I'm trying to setup a cups printing server, but I want the default admin to not be root. Google has given me a couple hints and the cups administration page a little further but I'm now stuck at the end.What I want is a user called admin who belongs to the group printadmin as cups server administrator.What I have done1) I have created a local user called admin user yast user interface , and a group called printadmin. Added admin to the group printadmin2) I changed the line in /etc/cups/cupsd.conf.SystemGroup sys roottoSystemGroup printadmin 3) Changed all instances of of Authtype from Basic to Digest (Allows me to have a file called passwd.md5 in /etc/cups/ with the name of the allowed cups admins inside)4) Ran the following command to create and add admin.Code:lppasswd -a -g printadmin dmin This is what I receive after running the commandlppasswd -a -g printadmin administratorEnter password:Enter password again:lppasswd: Die Kennwortdatei wird verwendet!
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Jul 24, 2010
where are the "System Log Viewer" config files stored? I know most have been moved into /var/rsyslog.d/ folder but where are the users config file stored? I restored my local /home to a fresh install and the Log viewer is looking for log files from the OLD install.
So there must be a config file somewhere in /home/$user that the system log viewer is reading from as well as the rsyslog.d folder...
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Nov 5, 2010
What methods exits to restrict which directories a user may browse on the filesystem. I want to prevent php scripts from being able to view system files. I've seen two solutions, but neither are satisfactory:Chrooting a directory that the script is in, but this requires that all the necessary php libraries/files are moved/copied into the right place relative to the chroot directory. I don't feel that I have the technical ability to achieve this.Putting php into safe mode and disabling *nasty* php functions. But this is ineffective if just one obscure *bad* php function is missed.
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Aug 25, 2014
I need do a small interfaz, it works under bash. I read the user name and password from the terminal then i need validate this data.
My principal dude is:
how look in the /etc/passwd file a user and passwd?
The problem is the password is encrypted and i need compare with the data I read.
Only I can use BASH because it is school homework.
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May 11, 2011
I need to customize linux kernel root file system for embedded linux system. During compile time, for root file system I am able to create different user/group ex: "gnumuzic/Muzic". But I want to give access to group "Muzic" to some folders like /dev/nexig during compile time.
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Jul 30, 2010
When i istalled kde4 on ubuntu 10.04 and login that this erro show me: p, li { white-space: pre-wrap; } Configuration file "/home/bahram/.kde/share/config/klipperrc" not writable. Please contact your system administrator.
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Mar 3, 2011
does any linux admins out there have any mailing lists that they subscribe to? I go to lots of sites for knowledge but i was trying to put together the double whammy and pull together a solid mailing list for linux admins as well.
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Feb 17, 2011
i created a /tmp partition amd mounted it like this:" mount -o loop,noexec,nosuid,rw /usr/tmpDSK /tmp"
I know i can't execute things in /tmp now but is there a way to execute only one file and no more???
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May 1, 2011
The desktop computer of my two children has a total of three users:
1) The superuser (me)
2) The user 1001 (my elder son)
3) The user 1002 (my younger son)
Both users 1001 and 1002 can not access their files system, and also they can not save any attachments from incoming mails.
What I tried so far:
I accessed the file manager as superuser, and went: >Root>Home. Here I right-clicked on the folder User 1001, selected properties, selected the tab 'permissions' and allowed this user to read and write into this folder. I also checked the checkbox �extend this permission to all subfolders and its contents.
The problem is, when I reboot, everything is 'forgotten' and I am at quadrant zero again.
Eventually I should state that part of the folders are from a backup drive, because the hard disk had to be replaced so, once I re-installed the OS on the new hard drive, I copied the folders from the backup drive into the home folder.
One last question:
Is there a good tutorial about permissions?
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Apr 6, 2010
I have an ntfs partition that I wish to access as a normal user(non-root). For this I did the following. As root I created a folder /windows and did a chmod 777 -R on /windows. Then I added the following line to /etc/fstab
Code:
/dev/sda3 /windows ntfs-3g defaults,nosuid,nodev,umask=000 1 0
Now, the partition is mounted alright but the problem is that when any other user (non-root) creates a files in /windows (say by executing touch newfile) the newly created file has the owner and group set as root. The non-root user can create the file and he can also delete the file, however, he cannot change the permissions of the file and also the owner:group is always set as root:root. How do I get across this problem, i.e. how do I mount a partition, so that a non-root user can also change the permissions and ownerships of the files he creates.
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Mar 23, 2010
I interest to know, what kind i should know for the technical knowledge for Network Engineer and System administrator ? I have a basic knowledge on linux. But still need advisability to be a Network Engineer or System Administrator. Anybody can advice me to know what i have to start to learn or know about the technical requirements to be a Network Engineer or System Administrator ?
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