Permissions are the unix way of controlling access to resources such as files, directories and devices and may be specified for an owner, group, or all users.

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umask is not working for directories

I have an odd problem with umask. My current setting is: $ umask 0022 $ umask -S u=rwx,g=rx,o=rx This only works for files though and not directories: $ touch abc $ ll abc 0 -rw-rw-rw- 1 user1 ...
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1answer
153 views

Don't have write permission in partition

In my PC I have installs Windows7 and then Ubuntu as OSes. When I try to access other partitions ( E: and F: which I'm using from Winsows7 OS) it get mount without any issue and can read and modify ...
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2answers
639 views

compiling with gcc broken for users but fine for root

So somewhere along the way compiling as a regular user has stopped working on my server. I'm on Debian Stable. Can't think what has changed on my system that would result in this, or how to fix it, ...
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2answers
1k views

Moving a root directory to a separate partition

I'd like to create a new partition and move the contents of the /var directory to it for the security reason of having /var/www and other subdirectories "mounted" with nosuid, noexec, and nodev ...
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1answer
413 views

File permission mechanism in Unix like systems

Can some one please explain with a an example the file permission mechanism in Linux and other Unix like systems ? What are the nine bits for ? Why do we have a group id for a user as well as for a ...
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3answers
300 views

I can not remove folder from server

Accidentall I created the folder on remotely server (Server OS is Linux) using php: mkdir("folder_name",0); Now I can not delete this folder from server. I think this is from permission, because 0 is ...
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2answers
345 views

Run program with additional supplementary group

I am looking for something like sudo (or something that can be run from sudo) that allows me to run a program with my uid and primary gid, but with an additional supplementary group.
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2answers
138 views

Change/Create permissions for a folder

How can I create (if the folder is new) or change (if the folder was already existent) permissions for a folder? In particular, I want to create a subdirectory in /etc/bind/ where I can put the ...
1
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1answer
1k views

add members of wheel group, sudo access

On Fedora15, following this wiki, I added a user to wheel group, which is already in the sudoer config file. but still I get not-a-sudoer error prompt. Should I specifically name every member of a ...
2
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2answers
736 views

Pre-defined umask under a given path [duplicate]

Possible Duplicate: How to set default file permissions for all folders/files in a directory? Say I have default umask, umask1. I would like all files/folders that I create/modify under a ...
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1answer
235 views

Accidentally set /lib permissions to 644

Long story short, I've got an Ubuntu server box that was recently compromised (I believe through a known exploit of an older version of Tomcat, which has already been updated). Part of the exploit ...
1
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1answer
667 views

Transmission client can't access mounted NFS share

I set up transmission-daemon on my Scientific Linux 6.3 machine to download files to a mounted NFS share (mounted during boot via /etc/fstab). The directory that the NFS share is mounted to was ...
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2answers
546 views

Linux isn't sure whether a file exists or not [duplicate]

Possible Duplicate: Getting “Not found” message when running a 32-bit binary on a 64-bit system ts3user@...:~/ts3$ dir CHANGELOG LICENSE doc ... ts3server.pid ts3server_linux_x86 ...
1
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1answer
684 views

Samba share file permissions - users can't open files that I create

I have set up an Ubuntu server (12.04 LTS) for samba file sharing. The problem I'm having has to do with files that I create on the server. Other users can't open them because I created them under a ...
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2answers
4k views

getting 553 - cannot create file in vsftpd (ubuntu 12.04)

I'm trying to setup a ftp account for a user that has read/write access to one folder: /items/myuser I've set up the account with username 'myuser' in Linux with the adduser command. After that, I've ...
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1answer
2k views

Accessing another user's files

I have a file "abc" with permissions 440 .The owner of this file is "root" and the group of this file is "groupabc" . I have a user "user1" .Is their anyway I can see the contents of files "abc" using ...
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2answers
443 views

sudo: script launched from another script won't redirect standard output

I'm using AIX 5.3 with sudo 1.6.9p23. Sudoers file grants user fcomartin permission to run any command as user oas: fcomarti ALL=(oas) ALL User oas has a bash script called menu, which launches ...
2
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2answers
7k views

wireshark: Couldn't run /usr/sbin/dumpcap in child process [duplicate]

Possible Duplicate: How to add write permissions for a group? When I run Wireshark, It shows the following message: Couldn't run /usr/sbin/dumpcap in child process: Permission denied Are ...
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1answer
7k views

addgroup vs groupadd

I happen to know there is a slight difference between adduser and useradd. (i.e., adduser has additional features to useradd, such as creating a home directory.) Then what is the relation between ...
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4answers
1k views

Is there a reason why 'owner' permissions exist? Aren't group permissions enough?

I think I rather understand how file permissions work in linux. However, I don't really understand why they are split into three levels and not into two. I'd like the following issues answered: Is ...
3
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2answers
3k views

How to prevent users from deleting a directory?

I tried "chattr +i DIRNAME", it's great, but I cannot create files in the DIR after chattr. What else are there to prevent users from deleting a Directory? root@HOST ~] mkdir test [root@HOST ~] ...
3
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2answers
1k views

setuid and setgid confusion

I'm trying to fully grasp the concept of setuid and setgid, and I'm not quite sure in what way permissions are actually elevated. Let me provide an example: Users userA (groups: userA groupA) userB ...
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3answers
102 views

File Privileges

There is one user Lets call him B and he needs access Just to Read the File MEANS READ ACCESS and that file is own by another user A . How can I grant access to user A's file to User B.
2
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1answer
482 views

Hide parent directory but allow to view dir

I would like the following result on my UNIX system: ls -l /users/test -> permission denied, or any other way so I can't see the content of it. ls -l /users/test/testdir/ -> shows all files in the ...
2
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1answer
5k views

Why can I not chmod a file?

[nathanb@ka /x/sim/nathanb/nbsim1] ls -al ,nvram -rw-r--r-- 1 root root 2097152 Jul 5 2011 ,nvram [nathanb@ka /x/sim/nathanb/nbsim1] sudo chmod a+w ,nvram chmod: changing permissions of ...
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2answers
1k views

chown removes sticky bit: bug or feature?

Steps to reproduce: germar@host:~$ cd /tmp/ germar@host:/tmp$ touch test && chmod u+s test && ls -la test -rwSr--r-- 1 germar germar 0 Nov 2 20:11 test germar@host:/tmp$ chown ...
2
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2answers
2k views

Can't copy/move between filesystems with SFTP

Are there any limitations on SFTP that prevents a user from copying between filesystems? I have a SLES with SFTP, and users can't copy/move files between filesystems, even when the target is chmod ...
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0answers
93 views

Running Tomcat MySQL and Apache under a group

I am trying to set up a web server at home using Ubuntu, but prefer my bash scripts to be platform agnostic hence why I am asking here. I also dislike apt-get everything. I am trying to create a ...
2
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1answer
1k views

ntp cannot open shared object file: Permission denied

On a server I haven't worked on, ntpd is broken: # /etc/init.d/ntpd start ntpd: error while loading shared libraries: libz.so.1: cannot open shared object file: Permission denied but permissions ...
3
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2answers
6k views

CentOS 6 VSFTP 553 Could not create file

I installed vsftpd yesterday on CentOS 6, however didn't get a chance to test it today. When I went to upload a test file it's coming back and giving me this error: 553 Could not create file After ...
3
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2answers
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Why is bash giving me (apparently) conflicting information about a file?

Background I am working on a RHEL 5 cluster. I want my Fortran program to read the file /home/bob/inputs/input_1 I asked Bob to give me permission to read all contents of inputs: [bob@server]$ ...
2
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2answers
152 views

Do best-practices indicate that usage of /var should be restricted to sudoers

I wrote a package, and would like to use /var to persist some data. The data I'm storing would perhaps even be thought of as an addition for /var/db. The pattern I observe is that files in /var/db, ...
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1answer
594 views

Cron job - permission denied creating a file

I have a cron job: #!/bin/bash fn=db.backup.$(date +%m-%d-%y).sql mysqldump -uMyUsr -pMyPass --add-drop-table dbName> $fn find ./ -name '*.Z' -type f -mtime +7 -exec rm -f {} \; I get an error: ...
25
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6answers
54k views

File permission issues with shared folders under Virtual Box (Ubuntu Guest, Windows Host)

I am using Ubuntu on Virtual Box and I have a folder which is shared between the host (Windows) and the VM (Ubuntu). When I open any file in the share folder in Ubuntu, I can not change it as its ...
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2answers
2k views

proftpd does not change default group for new files

I am Trying to configure ProFTPd to change group for newly created files/directories. In my config I have this: <Directory /home/*> GroupOwner www </Directory> Which does not seem to ...
3
votes
2answers
229 views

What is the proper solution to a web server trying to write to a directory?

So, I have a box with a "deploy" user. This deploy user owns a code repository and wordpress is running on this box... When wordpress attempts to do something like upload a plugin, it is using the ...
7
votes
4answers
6k views

When does chmod fail?

Under what circumstances will chmod fail? I looked at the man page but it only specifies usage and doesn't go into details about what circumstances it won't work in. I'd assume chmod will work if: ...
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0answers
3k views

Samba's “inherit permissions” does not inherit modes for other

I have a share with "inherit permissions = yes". I have a directory in the share with mode rwxrwsr-x. If I create a subdirectory, the modes are rwxrws---. The same happens with a parent directory with ...
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3answers
1k views

Copy files with permission 200

I want to recursively copy a directory, preserving file attributes, which contains a directory tree including some files that have permission 200 (i.e. --w-------). The copy command cp -ar ...
2
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4answers
2k views

Automatically change file permission upon write to a folder

How can I create directories so: /data /data/user1 /data/user2 and make sure that whenever root writes inside them, depending on which directory it writes to, different owners are set. Example: ...
2
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1answer
478 views

Specific directory permission for one user using sftp

My web server structure looks like this: /Home/User/Public_Html/Website_one /Website_two /Website_three/Directory_one ...
2
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1answer
493 views

How come I can append to files to a directory without write permissions?

I understand this first example: > mkdir foo > chmod u-w foo > touch foo/test touch: cannot touch `foo/test': Permission denied > echo "BAD" >> foo/test bash: foo/test: Permission ...
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1answer
256 views

How to disable messages in unix if mesg and chgrp not allowed?

This is one of my questions for my exam .. We are not supposed to use mesg y/n for this but we should effectively avoid mesgs along with the problem of not being able to change groups.
4
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2answers
1k views

Block SSH to all but root user

How can I modify my sshd_config so that it blocks access to all users except the root user? I've had a look and I tried AllowUsers root DenyUsers * But that doesn't do anything
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2answers
22k views

How do I find out if I am sudoer?

How does Linux system behave when I am not sudoer? Here is what happens if I try to use sudo: server:/tmp>$ sudo cal [sudo] password for user: Sorry, try again. Is it possible that I just don't ...
6
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3answers
2k views

Can't read a file although it's in my group and permissions for group read are set

I encounter a strange problem on a unix/linux machine: I'm member of a group, let's call it group A and a certain file (which has a different owner) belongs to group A as well. The permissions of ...
2
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1answer
5k views

Executing a script from Nagios event handler fails to run

I have Nagios running on a webserver. For this one Nagios service check in particular, if it fails, it will run a script. This script is triggered via Nagios event handlers. Nagios event handler ...
2
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0answers
261 views

Samba: system group mapping

I have w2008R2 PDC and Linux server with samba and winbind. Now I'd like to add some domain users to Unix adm group in AD. Let's say I have adm group defined in AD, and every user from this group ...
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0answers
1k views

Symbolic link to a socket

From a security point of view, is it safe to create a symbolic link to a socket file? The following bits of context refer to the deployment of a web application on a shared hosting service. $ ls -al ...
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2answers
160 views

Login to super user for running script

I have sample.sh script in /u01/dump location. I'm running it from root. My requirement is while running the sample.sh script it has to be login as oracle1 user using SU (super user) and display all ...