General :: Setting User Mountpoint Permissions In Fstab Without Uid / Umask
Jan 30, 2010
I'm struggling to understand an aspect of mounting and mountpoints with /etc/fstab. There is a large number of sites and threads that make recommendations using things like uid, gid, umask, and other options. These methods, however, which I've used, are file-system specific, useful only for filesystems such as (V)FAT and NTFS that allow them.My current situation is that I am mounting partition /dev/sdb5 in, let's call it /media/myMount. My goals:Mount this partition automatically upon boot using /etc/fstab...The partition should be fully accessible only to a specific user or group.What I've done is create the mount point in /media:
If user michapma were to carry out the mount, I believe it would work; however, I want the mount to happen automatically during boot. So, how can I achieve my user (or group) permission goals for this and any other such partitions using fstab?The manpage for mount has been helpful, but after reading many tutorials and forum threads, the only way I know how to do it is to have the user do the mounting or rely on the file-system specific options.
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Mar 16, 2011
My Debian system has by default umask permissions of 0022, which I never liked. One user can read all the files of another seems very insecure to me.
I am planing to set it to 007, so that user and group have rw but all others have none.
Are there any side effects to that? I have noticed from a trial I did where I was changing permissions on the filesystem that some system stuff in the OS does not work anymore, if "others" have no read permission anymore, so that is why I am asking.
And why are chmod / umask permissions sometimes stated as 4 digits? What is this "all" group in the end? Isn't that already covered by "others"?
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May 25, 2010
i wonder, why nobody has written about it ...
How can i grant permission for files to specific user or specific group ??
Updated:
We have 3 groups: "g12" ("u1" and "u2), "g34" and "g56".
"g12" should only read the file.
"g34" should write and read it.
"g56" should have all permissions (rwx).
And others should not access the file at all.
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Mar 21, 2010
I'm using ubuntu 9.10. I used the command:
root@aduait-laptop:~# sudo chown -R root:root /media/104B-FF96/Private to set the permissions of Private folder for root but it is giving error:
Code:
root@aduait-laptop:~# sudo chown -R root:root /media/104B-FF96/Private
chown: changing ownership of `/media/104B-FF96/Private/5.jpg': Operation not permitted
chown: changing ownership of `/media/104B-FF96/Private/6.jpg': Operation not permitted
chown: changing ownership of `/media/104B-FF96/Private/7.jpg': Operation not permitted
[Code].....
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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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Jan 25, 2010
Please see below:
vim ~/.bashrc
umask=0000(bottom line)
source ~/.bashrc
But when I relogin, default umask was still 0022. How could I do ?
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Nov 23, 2009
I am trying to set the umask for a process(orkaudio) which is running as the root user.This program creates dir and files and I need the umask to be 022. I have edited my /etc/bashrc -- and when i type in umask i get 0022 --- Not sure how to go about getting this resolved...
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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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Oct 29, 2010
I tried to place a mono icon in usr/icons/etc but I didn't have the permission to do so. I tried to change my user profile to Admin, thinking I could go back to custom, but that hasn't and it isn't allowing me to go back to my previous setting.
Within minutes of being an Admin user I noticed I couldn't even unmount something. I really need to figure out how to change my profile back to default.
After that has been dealt with, I would like some guidance on how to gain root access to put my icon where it needs to be.
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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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Apr 27, 2011
I'm having a bit of trouble understanding umask and mkdir in C++. In my program, I want to create a directory with the permissions 755.
If I do:-
Code:
The permissions come out all messed up.
But if I do:-
Code:
The permissions are set as expected.
I am having trouble understanding why umask(0); is needed, and what is the 'proper' way to use it so I can make my directory. From what I can understand from the man pages and everything, I need to set the umask in my program to allow it permission to make a directory with those permissions? And I don't get why umask(0); fixes it anyway!
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Dec 29, 2008
We have users that send files to our server via sftp... We normallyhave umask set to 022 but for these files we would like to force a umask of 002... I've tried to change in the .bash_profile but does not seem to make any difference...
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Jan 7, 2011
To create a daemon, you need to execute these 2 lines (among others):Code: init log
umask 0 What do each of these do?I didn't find anything on the 1st line. (The queries returned mostly "the log of the init (process)".)Google cast some light on the 2nd line: By setting the umask to 0, we will have full access to the files generated by the daemon. Even if you aren't planning on using any files, it is a good idea to set the umask here anyway, just in case you will be accessing files on the filesystem.
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Oct 27, 2010
after installing openSuSE 11.3 i was thinking a bit about security. I read, it's a good idea to set umask of users to 077 . I'm unsure now, where to do this, cause there are different locations offered in the web:
/etc/login.defs
$HOME/.profile
/etc/profile - umask would be valid for root too.
And for my understanding:
- Is it wise to set root to umask 077 too or could this lead to negative effects on my system.
- Is it even senseless to umask the normal user to 077 if there is just one desktop-user using my system (myself ).
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Jan 7, 2010
I have a daemon running as a local user account on my red hat box. The problem is the daemon creates directories using a umask of 022. I need group write access to the directories the daemon is creating. I need the daemon to use a umask of 002. I've edited the daemons startup script in /etc/init.d I've changed the umask in the /etc/init.d/functions file. I've added the line "umask 002" in the user's ~/.bashrc and ~/.bash_profile files. I've also setup /etc/bashrc to assign all users a 002 umask (just for kicks)
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Mar 25, 2011
I've decided to move this question into a new thread since i haven't received an answer for 3 days. This question was originaly posted here: [URL]... I've already searched in google, however i wasn't able to find an answer that solves my problem... How can i change the umask on a per user basis so that each user can have its own umask to fit his needs? For example: I have four accounts on my system ex.
admin1 : admin,
admin2 : admin,
manager : stuff,
user : user,
-So now I want everything from the admin group to be by default set to 002 (so that every user that is in the admins group can have a full share (-rwx rwx r--) of everything that is created by the admins).
-Then the similar to the above managers shoud have 022 umask.
-And each of the regular users should have 002 or 022 or 077 it is up to the users choice.
I hope that i have provided enough info thorough the example.
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Apr 25, 2011
Not sure if this is the right place to ask this question. In Solaris we have umask (shell builtin) and /usr/bin/umask. However I could not find /usr/bin/umask in Linux.
I want to know the difference between both and how can we achieve the functionality of /usr/bin/umask in Linux as its not there...
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Jul 19, 2011
I am writing this software that creates virtual block device nodes almost like loop does. I need to allow non-superusers to mount and umount filesystems from these devices. I don't know the names of the block device nodes beforehand so i can't use fstab entries to add "user" or "owner" flags there.
Currently i solve this by providing a small suid helper tool that verifies that this is indeed "my" block device the user is trying to mount and then just call /sbin/mount or /sbin/umount to do the job. This is definitely better than setting a suid bit for the whole program but not really perfect.
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Jan 4, 2010
Trying to set my fstab so I can mount an external USB HD as a normal (non-root) user. Here's the relevant fstab line:
Code:
UUID=b122b277-e085-4f50-9ddf-051efd89e
/media/usbhdext3noauto,user,rw,exec,noatime,nodiratime00
[code]....
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Feb 10, 2010
I am trying to setup fstab to automatically mount my NTFS partitions. I have used various Mount managers to create the entries in fstab. The fstab seems fine, but when mounting at boot or even via Nautilus I get the error message that I do not have permission to mount the disk.
1) Can this permission be set in the fstab file? If so what is the syntax of the fstab entry?
2) If not, is there a tool i.e. GUI to set the mount permissions?
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Apr 2, 2010
I wanted to assign ownership of my choice to my zip file while unzipping so I am using the command:
unzip yourfile.zip|awk -F": " '{print $2}' | xargs chown user.group
I also want to give 705 permissions to all directories and 777 to all files on unzipping?
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May 29, 2010
I have set up freenas with 3 1tb hard drives. I have set up the SMB shares for the drives and can view each shared drive from each of the machines on my network. I can copy files from the hard drives, on the freenas but when I try to copy a file to the Freenas hard drives I get a message that I need permission to do this. I have all my shares set as anonymous how do I change the permissions so that I can save files to the drives.
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May 20, 2011
'the command I would use to change the group permission to write and the user and other to read and execute for the file "generate-report"' Sounds simple enough but I cant get it to work at all, tried doing a search in google and on the forums here to no avail. Is it possible to do in one command or will I need two?
Ive tried:
chmod g+w, uo+rx generate-report
And numerous other variants all with no luck.
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Sep 25, 2009
On my Suse 11.1 computer, I'm only able to run 'mount' as root, but this screws up the permissions somehow, in that my external drives are now read only when I am normal user. I can plug my external drives to my mac osx laptop via usb or firewire, and I can read,write, and execute. As su, I can mount the drives using usb on my suse computer, but only as read only.
Optimally, I want to edit the fstab file to auto mount these external drives, and then have samba run to make the drives available (i.e. rw) on laptop.
NOTE:
1. I created the file systems on a laptop (mac osx) which has different user name than my suse 11.1 computer.
2. I tried to use chown to manually force user:group to be Mike:users instead of root:root, but the external drives still are 'read only.' Trying different options in column 4 fstab file kept giving same trouble, but I can now get user:group = 99: 99 (not sure what that means).
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Jul 6, 2010
Sorry if this is the wrong section for this type of question. Anyway, I have two servers running Ubuntu 10.04. Server A has an NFS share that is mounted on server B, and the former has this share set up with specific permissions for a group called netusers. This group basically grants its users read/write permissions, and blocking all of files from anyone who's not part of the group.My question is this: how can I set up the permissions on server B, such that if I was to add a new user on server B, he would have read/write access to the share? I tried adding a counterpart group called netusers with the same permissions on B, but that didn't work.
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Apr 4, 2011
I am running Linux Mint on my primary hard drive, and I would like to access some folders I have on my second hard drive, which has Windows XP installed on it. However, whenever I try to use these folders, I am greeted with the error message, "The file is not marked as executable." While I know how to set files as executable whenever I am using folders on my Linux drive, whenever I try to set such permissions on my XP folders, I can't seem to make it work. The files revert to their former status, and I'm told that I don't have permission. Should I set the files as sharable from within XP, so that they aren't marked as read-only? Or is there another solution I've missed?
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Jul 7, 2009
When I use nautilus open my home directory, everything is OK except that the file contents in the home directory are not presented. It seems that nautilus is still waiting and busy.
After that, I try to enter the user's home directory by the Terminal and succeed. I can use 'ls' to display the file in the home directory, But when I use 'ls -a' to print the hiden files, again the Terminal seem to be lock. the 'ls -a' is locked, I fail to 'kill' it.
At last, I find that everything that connects to the behavior which need to enter, delete or just dsplay the /home/$USER/.gvfs will fail and lock, and without any error message.
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May 20, 2011
I have a problem and I am on the way to become desparate. starting to hate and I hope that you can help me out of my misery so here it goes: I have an additional internal harddrive, which is formated with NTFS (because of having access with Windows). I want to make regular backups on this drive, using Back in Time. But this is not possible, because there is something weired with the permissions and user stuff.
In the YaST partioning manager I have set it so that I as a normal user can mount it. I have created a mount point named /media/Backup for the drive and it is entered in the YaST partitioner and also in the /etc/fstab. When I now do a rightclick on this folder in Dolphin and have a look at the owner of it, I see: root. Group: users.
[Code]...
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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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Jul 19, 2010
I would like to set both user and group permissions permanently to be 'rwx' (read-write-execute). I would like these rwx settings for all the future files and folders.
I tried umask 002, chmod etc, but they don't set it for future files.
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