CentOS 5 :: Granting R / W Permissions Of Devices To End User At Login?
May 27, 2009
I have a minor issue with permissions. There are a couple of devices that I need r/w access to in /dev. Whenever I first boot up and log in as end user (not root) and I need to access the devices permission is denied. Logging in as root there's no problem accessing these devices. However as an end user every time I need the devices I have to first su to root to change R/W permissions (chmod 666).
Now, the good thing is that the permissions stick even as I logout and then log back in, but as soon as I reboot my computer (every night) I have to go and chmod manually. I'm trying to find a way to avoid having to su and chmod manually but I'm not having much luck. The devices I am trying to access are /dev/ttyS1 and /dev/windrvr6, when I first boot up and login as end user the permissions look as follows:
crw-rw---- 1 root uucp 4, 65 May 27 04:11 /dev/ttyS1
crw-r--r-- 1 root root 253, 0 May 27 09:12 /dev/windrvr6
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Jul 12, 2010
I want to make sure that the user www-data cannot be used to login on my system (Ubuntu Lucid). How can I find out? - is there a command I can run against this user? (traditionally run by Apache daemon)
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Feb 27, 2011
I am running Ubuntu server with an SSH server installed. How can I create an ubuntu user and give that user permissions to read and write only 1 specific folder so someone can log in through SSH using the new username and only put files in the folder I specify?
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Dec 11, 2010
Is it possible "reset" all (X, GDM related) permissions/settings of one user? What would cause one specific user not to be able to log into anything via gdm/the login screen? After providing the proper password, the screen goes black and then jumps back to the login screen. No session alternative works, not even xterm or gnome failsafe. I can however log in via the console (Ctrl+Alt+F6, recovery etc). With another user I can log in via GDM just fine, and deleting and re-adding the "broken" user doesn't make any difference.
Some (maybe) relevent logs:
part of syslog:
Quote:
Dec 12 01:20:58 <specific user> pulseaudio[1358]: core-util.c: Home directory /etc/timidity not ours.
Dec 12 01:20:58 <specific user> pulseaudio[1358]: lock-autospawn.c: Cannot access autospawn lock.
[code]....
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Mar 22, 2010
After I edit /etc/group and I add a user to groups it didn't belong to, the user will not be able to use it's newly acquired privileges unless it starts a new session. Is there a command to refresh user/group properties in an ongoing session?
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Oct 3, 2009
I have a multi-user machine with several network interfaces (Ethernet, if that matters). I wish to grant selected users, or groups, full access to selected network interfaces (including ability to adjust IP address and to bind to low ports, but *only* on those interfaces). It is important to me that an user/group does not such full control over other interfaces. Granting partial, or temporary, root permissions is OK; it's a friendly environment.How do I go about it?System: Linux 2.6.recent; usual Debian setup (can be adjusted if needed).
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Jul 12, 2011
I have created a ftp user in centos 5,but it got all permissions to delete files in other location,view the entire directory and create any folder in every place. How to deny this permissions to the particular user.And please help me to give permissions only to a specified location given by the root.
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May 19, 2009
I am currently trying to replace my Windows Server with a CentOS 5.3 box running nfsd for file serving. I have it all up and running however I cant see anyway of securing user access rights to the shares as all you need to access them is just clone the User ID of a user authorized to access the share of any Linux system which seems a bit insecure to me? I was wondering if there was any advice on securing access to server shares in CentOS.
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Oct 4, 2010
I installed Centos 5.5 on a home PC to be used remotely.
All server daemons work fine but only start if the user is logged in.
How do I set the SSH server to start whenever the PC is turned on, rather than when the user is logged in? I read the chkconfig man page online but couldn't find anything.
Plus I put a script in my startup services to be run whenever the computer boots (I'm guessing when the users logs in). How do I go about setting that to run too whenever the system boots instead?
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Feb 25, 2011
I had successfully installed centOS,i am able to login as root.I created local users.But unable to login via console and FTP.As per the logs there were some LDAP issue,so i disabled LDAP and disabled PAM config as well.Now i am able to login to the FTP with the local users created.unable to login to the centOS console with the local user.
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Apr 12, 2011
When I login to my machine I can see a BLACK screen and my mouse pointer. This is not happening with other users.Few days ago when I tried login to my machine I noticed this. I can access ssh session and do stuff there but some time I need GUI.I can login fine using other users. This is only happening with one specific user.I have just noticed that if I try loggin with the same user which have issues using NX client it shows us a BLACK screen, then if I open xwin then I can see three new windows top panel, bottom panel and Desktop.
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Nov 20, 2009
Last night I started my computer and loaded my CentOS 5.2 partition (Windows 7 on the other partition). I was able to login to my account, but was given a gnome error that the panel buttons (i.e. weather, cpu monitor etc) could not be loaded. I then went to restart the computer (probably not the smartest thing to do) and was given some file errors upon shutdown that were related to /dev/VolGroup00/LogVol00. After restart I was taken to a shell and ran fsck manually. It seemed to find a lot of bad blocks, so I repaired the /dev/VolGroup00 system and restarted. At this point CentOS seemed to boot normally, but upon loading of the login screen I get the error: Configuration not correct The configuration file contains an invalid command line for the login dialog, so running the default command. Please fix your configuration.
I cannot even log in as root. I get the error /usr/bin/gnome-session: error while loading shared libraries: libgnome-desktop-2.so.2: cannot open shared objects file: no such file or directory. I then went to a shell and ran: sudo yum install libgnome-desktop-2.so.2, but the package was already installed and up to date, so there was nothing to do. I am therefore stuck at this login screen with pull-down menus and tabs where I can change the configuration, add/remove users etc. So, my question is this: How do I restore my user profile so I can login....and if anyone has some insight, what caused this to happen in the first place? I should also mention, this all happened after plugging the computer into a new internet connection. No clue if that's even relevant.
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Sep 10, 2010
I've had a server setup working perfectly for the last 2 years. Today we installed a newer version of postgresql and recompiled apache/php.
Postgresql will not start now.
"service postgresql start" = /var/lib/pgsql/data is missing. Use "service postgresql initdb" to initialize the cluster first. To initdb we need to be as user postgres.
"su - postgres" = "no file or directory"
In /etc/passwd = postgres:x:26:26:PostgreSQL Server:/var/lib/pgsql:/bin/bash
how i can login as postgres user and enter these commands?
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Jan 25, 2010
When I plug in a USB GPS device, using cypress_m8 module, is creates /dev/ttyUSB0 with read/write permissions for owner,root, and group, dialout. My question is really just where are the rules for setting these permissions and how exactly are the owner and group names set when /dev/ttyUSB0 is created, i.e. a serial USB device is plugged in.
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Jan 14, 2010
Ubuntu 9.10. I have a problem - when I mount other partitions of my hdd or the system automounts usb disks these are mounted in /media directory with permissions 0700. So there are two problems there:
- When I switch user on my desktop to another that user can't read data from the usb disks
- I can't share data through network because smbd doesnot have read permissions on the created mount points
I think editing /etc/fstab is wrong way, there would be more right way to change permissions on mount point. I tried to change/add parameters umask, allow_other in gconf-editor (/system/storage/default_options, subsections vfat and ntfs-3g) but that does not show any results. Article [URL] recommends Open Places → Computer. Every volume except the generic File system one should have a Drive and Volume tab in its properties dialog where you can set mount options. But I did not find those tabs. Where should I set option to mount usb disks with permissions rwx for every user of my system?
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Mar 8, 2011
I have a few websites that travel along with me in my usb stick, and I want to have read and write permisions to files on my usb by other users (i.e.: www-data) actually they have 0700. I'm running maverick (linux mint Julia).
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Dec 7, 2010
I'm working on a server and noticed that the to RAID5 setup is showing 4 Raid devices but only 3 Total devices. It's on a fully updated CentOS 5 system that only has three SATA drives, as it can not hold anymore. I've done some researching but am unable to remove the fourth device, which is listed as removed. The full output of `mdadm -D /dev/md2` can be see below. I've never run into this situation before.Anyone have any pointers on how I can reduced the Raid Devices from 4 to 3? I have tried
mdadm /dev/md2 -r failed
mdadm /dev/md2 -r detached
but neither work and since there is no block device listed I'm not quite sure how to get things back in sync so it's only seeing the three drives.
/dev/md2:
Version : 0.90
Creation Time : Tue May 25 11:07:04 2010
Raid Level : raid5
[code]....
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Sep 8, 2009
I installed CentOS 5.2 and then run yum update. I configured this server as LDAP/Samba primary domain controller. LDAP seems to be OK and for testing I am able to create users with:smbldap-tools useradd -am usernameI can ssh into the server as root and also as a Linux user which was locally created in the server. But ssh into the server as LDAP user fails (from a Fedora 11 machine) with "Permission denied, please try again", prompting again for password.Some data:
# rpm -qa | grep ldap
python-ldap-2.2.0-2.1
php-ldap-5.1.6-23.2.el5_3
[code]....
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Mar 4, 2011
1. I have two RHEL 5.4 Linux machines on the same network, A and B.
2. I have an application running on Machine A needs to read a file on Machine B.
3. Do I have to use something like NFS, or is there a simple command to permit this?
Note: I read a related thread, but was hoping there's something "out of the box" instead of using NFS, HTTP, FTP, etc.
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Jun 9, 2009
i am using openssh 5.2-p1, i want to restrict user "admin" to login to the server from a specific IP address, for this purpose i have tried the following blocks in sshd_config file.Following is the part of the sshd_config file which i have modified
#The following commands will only allow specific IP to login to ssh.
#AllowUsers admin user1 user2
#AllowGroups
# override default of no subsystems.Subsystem sftp internal-sftp
Match Group sftpgroup
ChrootDirectory /home
AllowTCPForwarding no[code].....
i want to restrict admin user to login to the server only from 172.16.100.221 IP which can be done by using AllowUser line, but i dont want to use AllowUser line,
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Oct 16, 2010
I'm setting up a raid 5 on several hard disks with a layer of lvm on top for good measure.I know the recent kernels support growing software raid, but since centos runs 2.6.18, I wanted to make sure it'll work. Does the centos kernel support growing raid devices?
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Sep 27, 2010
I have setup a VPS server, created two accounts to two domains respectively, and in one account I built a tool to manage other accounts. I have been rigorously researching and found information, however not implemented yet, about granting apache sudo rights through an interface on one account, so that it can execute scripts as root to manage installations in other accounts. what I mean this is my tool will use 'rsync' to duplicate installations from any account into any account.
My question for security, is it secure to grant apache sudo rights? I have not resolved successfully granting it permissions, and I would not want to waste my time investigating more on it if it can compromise the system in any way.
In your experience, is it feasible to build such a tool like I described? I have the tool working to copy within account and to addon domains and it works great, but I want it to manage all accounts on the server.
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Jan 27, 2010
Since I created second user USB devices as PTP camera, flash mass storage automounts always for the new user.
Even the second user is not logged in automount does not work for main user. When I log in as second user (with device plugged in) it is mounted automatically after log in.
What can I do with this problem?
I would like to access devices from each user (not necessarily at the same time).
How can I configure it?
How can I "remount" device to my current user without switching into the second one (it's someones else account)?
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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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Jun 16, 2010
How to enable Root login...i cant copy or move something on the HDD...I have administrator rights and password for root but i cant change permissions for the HDD without login on root and root login are not allowed .
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Feb 28, 2010
I have an external USB drive that is NTFS. It mounts fine under my account and my wife's, but only if I fully shut-down the computer between switching. While switching users or logging out then in with a different account it will not mount the drive. I am not sure what to do... but we both access data from the same drive.
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Oct 20, 2010
Does anyone have a permanent fix for not being able to use USB devices in VirtualBox as a regular user?
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Jun 3, 2011
yesterday I updated my fedora 13 to fedora 14 (on laptop) and today i cannot log in on user. It just go blank for a sec and is back to login.
At text console (alt+ctr+f2/f3) i enter my username and pass it give this for a sec and resets (clean) console
username: Name
password:
last used: [date]
login: no shell permission denied
i used unetbootin (fedora 14 netinstall to update) and later i updated 1,5G before reboot (did update that fix, forgot its name tho :s)
I would most likely reinstall everything, but i have some work at laptop and as death-line is near, i would prefer to fix it if possible.
edited:
i have installed F13 on unused space, is there a way for me to access and fix it? or at least get some files from there?
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Dec 14, 2010
I'm seeing really bad user login format under a standard installation and am wondering why ubuntu does this as default. I have noticed that the graphical login for gnome sizes itself to accommodate a user's exact password length. This indicates to me that somewhere on the unencrypted part of a standard installation with user encryption contains at least some indication of the content of the password length which seems a security flaw even if not a complete hole, it majorly reduces the number of attempts a cracker would have to cycle through.
And that's assuming that *only* the length is contained. Furthermore it seems that it would be MUCH better to simply display the number of characters entered into the pw field and allowing the gui to expand itself from an fixed size as the field is filled out so the the user still receives visual feedback for entering characters. Either a simple character count display should be entered into the field or a 10 dot to new line so that one can visually quickly count the number enter by multiplying from a 10base graphical observation.
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Jan 1, 2010
I have two servers, both running CentOS, but one running Cpanel as the control panel and the other running Webmin.
I would like to sync the web folders using rsync. However, when I sync the files from the Cpanel host the permissions look as follows:
Code:
But that doesn't work on the Webmin server which needs the following:
Code:
It seems the Cpanel install has the group as 'nobody' whilst webmin has it the same as the file owner. I can fix this by running:
Code:
But as the file transfers will be frequent, I don't want the files to be inaccessible until chown is run.
So, what I really want to know is - how can I change things on the 'webmin' server so that files with ownership owner:nobody will run?
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