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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Mount cifs Network Drive: write permissions and chown

I have access to a cifs network drive. When I mount it under my OSX machine, I can read and write from and to it. When I mount the drive in ubuntu, using: sudo mount -t cifs -o ...
3
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1answer
394 views

Redirecting output in the shell, permissions

I have a question about permissions. Distro: Debian GNU/Linux 6.0.4 (squeeze) So I have a folder with a php script in it. Both folder and file are owned by User1 If I do this: php script.php I ...
2
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1answer
4k views

Why useradd shows Permission denied error

I am working on CentOS 5.5. When I run the useradd command as root, then its working. But when I run the same command from one of the user, then it shows -bash: /usr/sbin/useradd: Permission ...
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5answers
1k views

How do I disable copy permissions?

Can we set permissions, on a Linux box OR for a particular directory (Scientific Linux in my case) that, one can read files but cannot copy, move or delete them? Update: My Scenario is, We developed ...
2
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1answer
2k views

Why can't I use strace with rsh?

If I run rsh, it works, but prints some strange “Connection refused” messages at the beginning: $ rsh localhost pwd connect to address 127.0.0.1 port 544: Connection refused Trying krb4 rsh... ...
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1answer
1k views

How to suid iwconfig on Debian wheezy?

I have a script running under my own user account that takes care of all sorts of wireless interfaces. It (more or less) intelligently switches wireless LAN off and on and so forth. However, it does ...
20
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2answers
3k views

How do I make a file NOT modifiable?

While logged in, I can do the following: mkdir foo touch foo/bar chmod 400 foo/bar chmod 500 foo Then I can open vim (not as root), edit bar, force a write with w!, and the file is modified! How ...
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1answer
2k views

Setting permissions with FTP

I'm having some issues setting up permissions for FTP. Read another thread on here regarding it, but I wasn't sure if it really matched what I needed. Essentially, right now I've got the client's FTP ...
4
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2answers
1k views

How do I create a hierarchy of UNIX groups as below?

I need to create a hierarchy of UNIX groups. Something like below: A |\ | \ B c |\ D e |\ f g ...where A, B and D are UNIX groups and c,e,f and g are UNIX accounts that are members of those ...
1
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2answers
610 views

How to make a path world-readable?

To make some item X world-readable, it is not enough for it to have the right permissions: each component of the absolute path leading to it must also have the right permissions. (My understanding, ...
6
votes
1answer
1k views

Is it possible to disable file permissions on a ext3 or ext4 file-system?

Is it possible to disable file permissions on an ext3/4 file-system? Just wondering if it's possible to completely disable or ignore file permissions on a ext3 or ext4 file system. Perhaps a mounting ...
0
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3answers
2k views

Why is umask setting a different permission for a directory and file I have created?

Consider: [user@server1 ~]$ umask 0770 [user@server1 ~]$ mkdir TEST2; touch TEST2.txt; [user@server1 ~]$ ls -l d------rwx 2 user group_name 4096 Mar 5 05:16 TEST2 -------rw- 1 user group_name 0 ...
2
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1answer
3k views

How to mount USB stick on Debian Sid?

I've just installed Debian Sid on my computer but I cannot mount external USB drives as you can see in the image. Mounting failed Cannot mount "SENZATITOLO" Not authorized What should I ...
2
votes
1answer
244 views

How to set up a script to run as root non-interactively?

I need to set up the following script to run as root whenever I log in: #!/bin/zsh truncate -s 0 ~yourstruly/.juniper_networks/network_connect/ncsvc.log I know how to run the script as root ...
3
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0answers
561 views

Network Manager doesn't show Wireless connection

I've just installed on my Debian Sid with XFCE4 network manager, but I have a problem, no wireless connection are shown. What Should I do? I used to use wicd but I had problems to connect to free ...
2
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3answers
518 views

How does gcc handle file permissions?

The executable files that gcc creates have execution permissions -rwxrwxr-x which are different than the permissions that the source file has. -rw-rw-r-- How does gcc set these permissions ?
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1answer
1k views

Allow all group members to create directories and files

There are 2 users sftp_user apache Both users belong to the updaters group as well as other groups. New directories and files are created in the /updates/ directory. drwxrwsr-x 8 sftp updaters ...
2
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1answer
3k views

How do I mount an NTFS partition in /etc/fstab and prevent files/directories from receiving exec permissions when they're created?

I have an NTFS partition that I want to mount using /etc/fstab. I don't want any files to have executable permissions on this drive, so I wrote the following rule: /dev/sda2 /media/sharedfolder ntfs ...
1
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0answers
45 views

Existing file can not be found? [duplicate]

/usr/share/tipp10$ ll insgesamt 9408 drwxr-xr-x 3 myname ssl-cert 4096 Feb 26 20:07 ./ drwxr-xr-x 288 root root 12288 Feb 26 20:07 ../ -rwxrwxrwx 1 myname ssl-cert 9480 Okt 6 2010 ...
1
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2answers
137 views

run a command as different user with available sudo permissions

I want to run the below command echo 1000 > /sys/class/backlight/intel_backlight/brightness i cannot do it it like below beecause bash is the process that actually directs output to the ...
1
vote
1answer
698 views

Having owner access on files upon mounted NFS directory

I have a Linux RedHat server and a Solaris 10 client. I have mounted a directory which locates on the RedHat server, in the Solaris system with RW(read/write) option. I already have some directories ...
2
votes
2answers
936 views

setfacl incorrectly changes group permissions

To backup the "/home" directory tree of a server, I've created a 'backup' account and used setfacl to make the whole directory readable by it. My cron job runs this command as root each night: ...
0
votes
1answer
3k views

Cannot execute binary file on Mac OS X Lion 10.7.5

I want to execute phylocon on a mac OS X lion but after changing the path and making the file executable, I get the error 'cannot execute binary file'. But the steps that I took to running the command ...
1
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1answer
1k views

File is readable by everyone, but I can't open the file

I'm fairly new to Unix and I have written a script: SERVER="/usr/local/abc/.../somefile.txt" OPTION="$1" if [ x$OPTION = "xtitle" ] then grep $OPTION $SERVER exit fi As far as I ...
2
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0answers
123 views

Problem with encrypting /var/www and ikiwiki

I tried to encrypt /var/www with encfs. To do so I did following: mv /var/www /var/www.bak mkdir /var/www_enc encfs --public /var/www_enc /var/www cp -a /var/www.bak/* /var/www/ /etc/init.d/apache2 ...
2
votes
1answer
551 views

Properly Set Permission to /home/user folder for webserver

I'm currently setting up my own Linux server running CentOs 6. To test the security on my server I wrote a PHP script that acts like a sort of "navigator". I can go one directory up, open the files, ...
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0answers
146 views

External HDD read/write permission changing from a cron job

So, I run an overnight python script that runs a backup of our web data in the /var/www directory, then moves the backups to an external HDD in /media. The script in scheduled in the sudo crontab ...
0
votes
1answer
35 views

A user in a group does not have group access?

I have a fresh install of ubuntu server 12.10. I have created a group called www-dev and a user called dab. the user is in the group and i can verify that by members www-dev which returns dab. I ...
2
votes
2answers
606 views

cannot touch -m a writable file

Can someone explain why I get permission denied when running touch -m on this file even though it is group writable and I can write to the file fine. ~/test1-> id uid=1000(plyons) gid=1000(plyons) ...
0
votes
2answers
808 views

Linux Permissions vsftpd

I have mybb installed and running in /var/www/forums. I have two users part of the www group, logan and www-data. I have the recursive permissions of forums directory set to: chmod -R 755 forums ...
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2answers
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Why does “chmod 1777” and “chmod 3777” both set the sticky bit?

To set the sticky bit on a directory, why do the commands chmod 1777 and chmod 3777 both work?
2
votes
0answers
269 views

Best location and permissions for socket files [duplicate]

I will have a couple of WSGI applications. They will communicate with nginx using sockets. For that purpose I've created the directory /run/wsgi in which I will place all the socket files that are ...
1
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0answers
200 views

Unable to transfer files via SFTP when using a normal user account

I'm unable to transfer files via WINSCP>sftp to a GNU/Linux server. When transferring a file using root account, there's no problem. However, when I transfer using another account, the file being ...
2
votes
2answers
150 views

Circumvent permissions of filesystem on an external drive

Suppose that I have only non-root access on a desktop Linux machine. I want to work with an external, pluggable storage device (hdd, flash drive or memory card) with an ext{2,3,4} file system. Since ...
2
votes
1answer
256 views

How are default permissions determined (on OS X)?

My (limited) understanding of basic Unix is that any files that are created will be created based on the permissions of the creating user. In particular, the group assigned will be the creating user's ...
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2answers
63 views

What permissions should I set if I'm the only user?

I'm the only user on a OS X machine and am wondering what the best practice is for setting permissions on my sensitive files. Specifically, are there reasons to prefer one of the following -rw------- ...
2
votes
3answers
292 views

How to cp or rm files based on ownership / permission

After a problem with spam, I stopped postfix postfix stop and checked through the mailq manually to find hundreds of thousands of unsent spam. The spam was sent from one of the sites hosted ...
0
votes
1answer
404 views

Execute John the Ripper on multiple processors using mpirun

I am a linux noob trying to optimize John the Ripper for a security class. I am trying to use both processors to run John by using the mpirun program as suggested in this tutorial. I installed mpirun, ...
4
votes
3answers
842 views

Is it possible to set per-user permissions in Linux?

Is this possible? It seems that I have more options to set permissions in Windows than Linux. Let's say I want to give a user full access to a top-level directory but limit their access to certain ...
4
votes
2answers
118 views

Is there a Linux file permission that allows the app to read a file but not a user?

I need /var/www/config/config.json to be read by my app but not by users calling myapp.com/config/config.json. How would I do that?
9
votes
1answer
852 views

rsync: skip files for which I don't have permissions

I'm using rsync -rlptD to copy a directory from another user. There are a few files (I have no way of knowing these in advance) which I don't have permission to copy. Is there a way have rsync ignore ...
2
votes
1answer
748 views

why cannot rename subdir when parent dir owner is not the same user [duplicate]

Possible Duplicate: Can’t rename a directory that I own I am trying to understand why when a dir X is owned by user A cannot rename it when parent dir of X is owned by user B. Can anyone ...
1
vote
3answers
733 views

Finding lists of files with specific permissions

I looked into the find command and came up with find . -maxdepth 1 -perm 521 > test.txt to output the permissions to a text file, but is it possible to do it just using, for example, simple ...
1
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2answers
451 views

Is there a generic approach to automatically make some sysfs controls ch{own,mod} user-accessible?

My current primary question motivator: $ ls -l /sys/devices/platform/samsung total 0 -rw-r--r-- 1 root root 4096 27. jaan 14:17 battery_life_extender drwxr-xr-x 3 root root 0 19. jaan 18:40 leds ...
1
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1answer
141 views

Securely running LAMP under a specific user

I'm setting up a sandbox type of server that will be used by a couple users as a development environment and knowledge base. The server will have a web frontend so I've installed Apache, MySQL and ...
6
votes
2answers
475 views

Can a user brute-force a directory listing without having read permission on the directory?

I noticed that when a user is working in a directory to which he does not have read permission that using cd produces different error messages, depending on whether or not a subdirectory exists: $ ls ...
20
votes
2answers
5k views

How do I remove a file with no permissions?

A hacker has dropped a file in my tmp dir that is causing issues. Nothing malicious except creating GB's of error_log entries because their script is failing. However, the file they are using to ...
2
votes
1answer
270 views

How can I copy a git repo from a Makefile?

I'm writing a Makefile to sync my local dotfiles with GitHub. I recently decided to also add my .vim folder to the repo. But when trying to copy the .vim folder I keep getting a Permission denied ...
4
votes
3answers
8k views

Recovering from “chmod -R 777 /” in Ubuntu [duplicate]

Possible Duplicate: Wrongly set chmod / 777. Problems? I am using Ubuntu for development purposes. As I work on the database side, there are a lot of things which require file permissions ...
1
vote
1answer
204 views

Cannot execute files on another partition

On my system I have three partitions: one is shared between W7 and Linux Mint (NTFS), and the other two are OS-specific. In my home directory I have created a symbolic link to another directory on ...