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Questions tagged [passwd]

unix/mac questions about password changes or storage, the related `.passwd` file or `passwd` command

140 questions
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How to do conditional .htaccess password protect

I'm trying to password protect a specific url using a .htaccess. Different urls point to the same files but have different workings. I now need to password protect only one url. I'm trying to do this using setenvif but it doesn't seem to work. I…
Clooner
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Why is `pw_gecos` named as such?

In the passwd struct: struct passwd { char *pw_name; /* username */ char *pw_passwd; /* user password */ uid_t pw_uid; /* user ID */ gid_t pw_gid; /* group ID */ char *pw_gecos; /* user…
WilliamMartin
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Can not add new user in docker container with mounted /etc/passwd and /etc/shadow

Example of the problem: docker run -ti -v my_passwd:/etc/passwd -v my_shadow:/etc/shadow --rm centos [root@681a5489f3b0 /]# useradd test # does not work !? useradd: failure while writing changes to /etc/passwd [root@681a5489f3b0 /]# ll /etc/passwd…
Nemanja Trifunovic
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Passwd command in Single User Mode on OSX not working

I am currently trying to create a root account from Single User Mode on OSX Yosemite /sbin/mount -uw / launchctl load /System/Library/LaunchDaemons/com.apple.opendirectoryd.plist passwd The first 2 lines appear to work fine, but after I type…
mucle6
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Unix programming. Not sure how to use the passwd struct

I've done some research and I'm still struggling with the passwd structure. http://www.opengroup.org/onlinepubs/000095399/basedefs/pwd.h.html I need to obtain the user ID, however, I don't think I'm understanding the function for this at all: int…
Bryan Harrington
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passwd: unrecognized option '--stdin' error on Debian when I run my created Bash Script

I am using Debian. I am learning Bash scripting. I am creating a script that creates new user and sets password the problem is I get passwd: unrecognized option '--stdin' error That is my script: #!/bin/bash read -p "Please Enter Your Real Name: "…
hosam.shafik
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Check username/password in Linux without root

If I have a username and password pair how can I verify that they are actually correct in a Linux system? I know I can use passwd to do so but I want to do it programatically using C. I should not require root privileges (so reading the shadow file…
user1618465
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Protecting /etc/passwd and /etc/shadow from concurrent access

How do I protect /etc/passwd and /etc/shadow from concurrent access? I don't see any locking mechanism in pwd.h. I see the manual for pwd_mkdb mentions obtaining a lock, but is it just locking the file for exclusive access? Is there a convention…
indiv
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How do I find out the complexity needed for a Unix password

My Unix password has timed out, and I need to enter a new one, so I get this bit as soon as I login: Current Password:#### New Password: but anything I type is too simple (apparently), even 1y4y5re987wnf Is there something I can type to find…
f1wade
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Linux : How to set up "global" user / passwords / groups file in svn

I'm trying to set up global user / group access to all my svn repositories on Linux. Since I am very new to svn / linux stuff can someone take a look at what I have set up. I still get a "Invalid authz configuration". Here is how I proceed : Svn…
Simmoniz
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What API do I call to set a user's password on linux?

I know about passwd(1) and crypt(3). What I'm looking for is a C API to call which will set the user's password in the passwd/shadow files, without having to programatically walk the files and overwrite the entry for the user in question. …
Stéphane
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/usr/bin/passwd and the CAP_CHOWN capability

I was experimenting with Linux Capabilities, and I noticed that for the passwd program to work without being Set-UID root, it needs to have the CAP_CHOWN capability (in addition to some others). Logically, why would it need to have CAP_CHOWN at all?…
Apoorva Iyer
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Migration of NIS yppasswd hashes from crypt to md5

Imagine a NIS user database /var/yp/input-files/passwd consisting of old crypt DES hashes. The aim is to migrate this database to md5 or sha hashes. When changing a password using yppasswd, it is generated using the same algorithm as for the…
Speckinius Flecksis
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Compare two passwd structures

I have a problem which I have narrowed down as much as I can imagine. I want to count the lines in /etc/passwd two times. One time as a reference and one time to detect any change. I initialize one passwd structure and count the number of entries in…
macbug
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Change linux password with Ansible playbook script when connecting as a non-root user without sudo privileges

I am trying to change password for a non-root Linux user from Ansible playbook. To do so I tried to follow this link Following the instruction I can successfully change the password of a non-root user by typing the code below in the terminal. $ echo…
kuttumiah
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