CentOS 5 :: Restore Default File Permissions - Server Nonfunctional
Dec 4, 2009
I was working on a shell script to change the permissions of large directories and subdirectories because of an exploit discovered in the programs that run in those said directories that allow a client to upload and download files to the server. Loan behold I accidentally added a space and had something along the lines of "chmod -R 770 ." run on / logged in as root.
Yes, it was an incredibly noob move on my part, but nothing ventured nothing gained. I am surprisingly calm about this. I tried sliding in my CentOS installation disk and "Upgrading" CentOS but that only made it worse, beforehand I made everything owned by root so I could at least log into GNOME. This does not work for obvious reasons, namely having to change the permissions back for every user and every group, which far beyond a possibility.
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Jun 29, 2010
well, by mistake i ran a command and chown the whole server apache:apache
now, i can't do anything... is there a way to restore the original permissions??
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Dec 2, 2010
I re-installed ubuntu 10.04 for prep I did a backup with Simple Backup Config after reinstalling i restored with Simple Backup restore some installed software software now doesn't start and after troubleshooting i think problem is file permissions but i'm not sure which permissions of which files to change and what they should be changed to. has anyone had experience with this and if so is it because it works or because its the right way to do it and it works funny thing.. i can't find any forum posts with info on Simple Backup!
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Jun 7, 2010
i initially installed ubuntu, working with gnome for a while. i now migrated to kde as i like it better. however, the kde session still has lots of the "old" file associations set as they are in gnome...
some examples? text files open in gedit, instead of kate pdfs open in "document viewer" instead of okular double clicking zip folder opens the "archiver" (gnome?), extracting an archive from the archiver and then pressing the "open folder" dialog after extracting has finished, opens nautilus (although dophin is the default program for inodes). etc.
i'm aware of the possibility to edit file associations, however thats a tedious thingy to do, if you want to get it complete... furthermore, the file association edit dialog has the "defaults" button disabled, hence my questions:
is there any way to "restore" the kde default file associations, just as i would have installed kubuntu initially? i don't want to reinstall just because of this.
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Oct 19, 2010
I install a Bind 9 with chroot in Centos 5, but the issue is the Reverse Name Resolution Zone File didn't create by default like other zone files, so i look into /var/named directory i don't find the reverse name resolution zone file even if i add this zone on named.conf
zone "1.168.192.in-addr.arpa" IN {
type master;
file "1.168.192.testsip.com.zone";
allow-update { key "rndckey"; };
notify yes;
};
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Jun 26, 2011
I have a file server running a cronjob to reset file permissions on a regular basis. I was thinking, I wonder if there is a way to do the chmod and chown command in a single command, as I always have to do both on the same folder, the way that you can do "chown root:users Uploads" instead of having to do two separate commands for chown and chgrp.
Then I got to thinking, are these commands even necessary? Every file copied or moved into these folders by any user needs to be something like "chmod 750" and "chgrp root:users", so rather than running a cronjob to do these modifications at regular intervals, there ought to be a way to set the folder permissions so that any files contained within will have these permissions.
The problem arises because users create documents, then a supervisor with elevated privileges can move those documents into a shared folder, however the permissions are wrong, they are user1:user1 for the owner and group and the other users can't read the file until a cronjob changes the group to be users. This has actually been acceptable, but certainly there is a better way to do this.
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Jul 3, 2011
my dad has been using Ubuntu for a few weeks now and likes it, however he's having some issues regarding read-only files. He's a doctor and frequently has to download word files to edit, however they always download as a read-only file. While this isn't particularly difficult to do, he finds doing it tiresome and because he isn't the most proficient PC user, may have difficulty with it when I return to school after the summer. I was hoping that there's some way to change the default settings so that all files downloaded are writeable.
Additionally, he has a number CD-RWs which he both retrieves files from and stores them to, however when trying to access these CDs he is told that they are read-only. Right clicking on the CD and trying to change the access permissions doesn't work (says that permissions can't be changed because the disc is read-only).
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Jul 1, 2010
System Specs:
CPU: Intel Core2 Quad Extreme X9450
Memory: 4GB, Patriot DDR3 PC3-10666 1333Mhz
MoBo: ASUS P5E3 Delux
OpSys: Ubuntu 10.4 (64Bit)
Short Description: I wanted to see what would happen if I upgraded from Kubuntu 8.04 (32bit) to Ubuntu 10.4 (64bit) by copying my home directory then restoring it after the upgrade. It almost worked sans a few interesting problems that I'm hoping might teach me a bit more about how Ubuntu works.
Detailed Description:
1. I copied my home directory to another hard disk.
2. I let the installation disk for Ubuntu 10.4 (64bit) reformat and overwrite the disk that contained Kubuntu 8.04 (32bit) and chose to maintain the partition and swap size for that disk.
3. Once I worked out some bugs in the hardware and got the OS up and running smoothly, I "merged" my home directory with the backup I had created in step one. (Merge was an option given to me when I was attempting to paste the files copied from the backup disk.)
4. It should also be noted that I was trying for a while last night to install TrueCrypt. In order to do that I had to check its "sig" file. The GUI for the gpg installation was complaining that I didn't have gtk+-2.0 installed so I installed gtk (I think it might have been 2.4 or whatever the most recent one was) from source without any errors. It got late so I gave up on attempting to install TrueCrypt any further.
The Results: This morning the computer seemed to boot faster than it had been before, but I was left without a functioning Theme manager. It will open, and I can click on all of its features, but nothing seems to do anything. For example: If I right click on the desktop and choose "Change Desktop Background" Then select "Get more themes online", nothing happens. Also if I select the "theme" tab, there are only two themes listed when there used to be about 9 by default.
Questions: 1.) Is there a way to restore the files that are important for correct system operation (possibly all the files starting with a dot ".*") in my home directory to there default state like they would have been from a fresh install, but without doing a fresh install and without loosing any of the documents or archives in my home file?
2.) Is this even the correct approach or might this cause more problems? For example, if your computer had this problem would you try and restore the home directory, or would you troubleshoot each problem as it arises one at a time until everything became stable?
3.) What could I do next to continue troubleshooting the theme manager?
I'll keep researching and trying to find some links that can help while I wait for your responses. If I find anything that helps I'll post the fix here.
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May 14, 2010
Does anyone know why files in /boot are world-readable (particularly the initial ram disk)? I'm not an expert, but I would not expect anyone except root or a sudoer to have the ability to read these files.
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Jan 14, 2010
This is probably a pretty basic question seeing as I'm pretty new to Ubuntu Server. I'm running a simple website from my Ubuntu Server machine with The files are all stored in /var/www/ and then subdirectories. The problem is that when I add files through FTP I need to go and change all of the file permissions since by default they do not have read access so can't be accessed through a web browser on another machine.How can I make the default permissions readable for the directory and all new files that will be moved in it
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Feb 5, 2010
What do the default file permissions in ubuntu 9.10 protect/deny access to?
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Mar 28, 2011
Files saved on our ubuntu server via samba server are all being created/saved as read only (-rwxr--r--). The users are MAC Users who are connecting via finder.I have taken 2 steps:First I added the lines "umask 0000" to the .bashrc files in the users' home directories.Second, I have modified the /etc/samba/smb.conf file such that I set "create mask = 0000" and also "directory mask = 0000" but the files are still being created as "-rwxr--r--".
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Jun 28, 2011
When I create a new file/folder in a ext4 data partition, it has permissions:
owner: rwx
group: r
other: r
I would like to change this default to:
owner: rwx
group: rw
other: -
I tried changing fstab, but umask and guid are not supported mount options for ext4. What can I do?
Note: I know I can do a chmod, but I don't want to do this again and again for every new file I create.
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May 5, 2010
I had a major raid event recently which caused my Ubuntu 9.04 server to recover part of its file journal on the system partition. This caused some of the file permissions to go all funny and I now need to change them manually.
What the file permissions should for the following folders:
/etc/
/home/
/lost+found/
/mnt/
/root/
/sbin/
/srv/
/tmp/
The server is running and I fixed the some of the ownership issues already. I use a basic LAMP setup with samba, and proftp.
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Nov 18, 2010
I'm just wondering: I know that umask sets the default file permissions for files, however I want to know if there is anyway to set default file permissions for newly created directories.
For example, I want my user to create new directories that anyone can access and modify (777) but I want the new files the user creates to be 755 (read by everyone, written only by user).
Is this possible?
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Apr 14, 2010
I am using Red Hat Linux 4 .There are some few questions in my mind related to umask. I want to know that is the default file and directory permissions ?
- When we use umask (022) command in terminal. and create a new file then the permissions applied for new file is for that session and when the system will reboot linux will take automatically its default permission from etc/bashrc or /etc/profile ?
- Can we make our own umask or the professional way is to follow 022 only ?
- What is the benefit of umask in Linux?
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Sep 1, 2011
I recently lost the default panel from the top task bar, a message appeared on boot up saying a config file was missing or couldn't load - or something to that effect. I didn't realise to what it was referring until the computer (an Acer One) completed its start up and I could see the desktop
How can I restore the panel? (graphic from my other Ubuntu laptop attached showing the default panel appearance)
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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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Feb 19, 2011
I accidentally deleted the file called "fstab,v" not "fstab" The files location was /etc/fstab,v if it is very important file and what its used for & how to restore?, as my server seems to be running fine, but I don't want to get into any problems later down the line.
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Mar 16, 2010
Is it possible to reset apache 2 permissions to default permissions I'm using Ubuntu 9.10 command line server, would webmin give me this access ?
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Jul 7, 2010
I have two users: test1 and test2 When i logged in as test1, I can not change the ownership of a file to test1:test2 it says: Operation not permitted
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Jan 5, 2011
i was follow a tutorial how to change show desktop to minimize all windows
can any body help me how to restore it to default ?
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Apr 25, 2011
Client has a server running 5.5 (I think) and it they moved locations. This server is used in other locations (state) via ssh tunnel as well so they can all access files.
When attempting to boot up I get screenshot 1 (superblock errors)[url]
They supposedly have a backup on a hot swap scsi and I want to know how/if I can restore it using that backup if I cant fix the superblock boot/error issue.
I took some other screenshots:
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[url]
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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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Dec 2, 2009
I'm using ssh2 a PHP extension to create a new folder on my server, however if I try and set the permissions of that
folder above the default of 0755 it creates the folder with that default setting.
It seems like there is some setting preventing me creating a folder with higher permissions e.g 0777.
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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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Jun 9, 2009
I have just started using linux. I have setup an ubuntu apache2 server. It has been running brilliantly and I am highly impressed with the Linux system. My box is an HTTP server and I am hosting a website on it. I have VSFTPD installed and functioning as my FTP software. It has worked fine so far but I have been a bit annoyed that I have had to set permissions for each file I have put on there.
Now I have run into a serious issue with the permissions being set to 600 and I really need them to 755 because I am running an automatic upload for a webcam and the Image can't be accessed due to the automatic permissions of 600 being set to the image. My extensive windows background tells me that I need to apply the correct permissions to the WWW folder and get the files to inherit these permissions automatically.
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Jun 24, 2011
Quickest way to restore permissions on files?Someone changed every file on the system to 0000. I have a backup, yes. But I don't want to copy every single file back over.Is there a way to just restore the permissions from the backup?
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Mar 16, 2011
Trying to setup a file server for a small group of users and I am in need of help with file permissions with Ubuntu Server 10.10.
I have a single share mapping (ex /media/hdd1/share1). There are several folders that everyone will need read/write/edit permissions and there will be a few folders that all users will need read permissions and a couple of users will need read/write/edit permissions.
I have tried several things and as long as I create the folders/files through ssh using sudo, the permissions are fine, but when the users create file and folders through their computers (mixture of Windows and Mac) that user becomes the owner and no one else can write or edit those files.
I am using SAMBA and though it was a config issue with that but I logged each user directly into the server with the same issue.
I tried sudo chmod 777 /media/hdd1/share1 but all newly created files have the above issue.
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Feb 3, 2010
I'm having an issue that I've seen before on other OS's (Solaris), but I'm coming up blank on solving for an NFS mount shared from RedHat I've googled this, and looked through all the FAQs and mail lists I can find.
The issue is this:
Whenever a new file is created from an NFS client to an NFS mounted file system, the group and world permissions are being stripped such that any new file created ends up with 0600 as the file permissions. On the server, I have tried various sharing options (all_squash, anonuid, anongid, no_acl) with no luck. I've looked at the underlying mount point ownership and permissions, checked the file system acl's (getfacl...they match the visible file system), and set the custom SELinux (not mine) config to permissive. The file system is on an LVM partition, and has an SELinux group assigned in /etc/fstab. I've unmounted it, and performed a vanilla mount (no options). No amount of trial and error is working. Any file created by any user on an nfs client machine creates files with 0600 permissions, and local users on the nfs server create files with permissions based off their umask settings. I originally thought it was due to mismatches in permissions from Windows to Linux (The server also NFS shares to Windows 2K boxes using hclnfsd (PC/NFS)), but I confirmed the same issue between RedHat systems.
One thing I'm wondering from my reading. It's mentioned in many places that ownership should be root in most cases and not some other user. This entire file structure is owned by a user that is ONLY local to the server box (long story, but the box is isolated....no DNS and only local users and settings).
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