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Homework and Emergencies Homework & Coursework Questions Trouble with setting permissions and such Post 303045016 by AggressiveZebra on Wednesday 11th of March 2020 12:42:55 AM
Old 03-11-2020
Trouble with setting permissions and such

I have been trying so hard to be able to do this on my own but I feel I am not grasping what is being asked and I don't know how to start. I Am learning sysadmin fundementals but it is extremely hard. Please help!

1. The problem statement, all variables and given/known data:
Set permissions on sensitive files:

Set permissions on /etc/shadow to allow only root read and write access.
Set permissions on /etc/gshadow to allow only root read and write access.
Set permissions on /etc/group to allow root read and write access, and allow everyone else read access only.
Set permissions on /etc/passwd to allow root read and write access, and allow everyone else read access only.

Create user accounts:

Add user accounts adam, billy, sally, max, tripwire and sysadmin.
Force users to create 16 character passwords incorporating numbers and symbols.
Force passwords to expire every 90 days.
Ensure that only the admin has general sudo access.


2. Relevant commands, code, scripts, algorithms:
chmod, chown, chage, groups, usermod, etc


3. The attempts at a solution (include all code and scripts):
Code:
chmod +rwx /etc/shadow
chmod /etc/shadow
ls -l /etc/shadow
chown -c /etc/shadow


4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
University of Riverside, California, Matthew Summerville, Cybersecuirty Bootcamp
 
Test Your Knowledge in Computers #23
Difficulty: Easy
One Terabyte (1 TB) is equal to 1000 GB.
True or False?

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GSHADOW(5)                                                 File Formats and Conversions                                                 GSHADOW(5)

NAME
gshadow - shadowed group file DESCRIPTION
/etc/gshadow contains the shadowed information for group accounts. This file must not be readable by regular users if password security is to be maintained. Each line of this file contains the following colon-separated fields: group name It must be a valid group name, which exist on the system. encrypted password Refer to crypt(3) for details on how this string is interpreted. If the password field contains some string that is not a valid result of crypt(3), for instance ! or *, users will not be able to use a unix password to access the group (but group members do not need the password). The password is used when a user who is not a member of the group wants to gain the permissions of this group (see newgrp(1)). This field may be empty, in which case only the group members can gain the group permissions. A password field which starts with an exclamation mark means that the password is locked. The remaining characters on the line represent the password field before the password was locked. This password supersedes any password specified in /etc/group. administrators It must be a comma-separated list of user names. Administrators can change the password or the members of the group. Administrators also have the same permissions as the members (see below). members It must be a comma-separated list of user names. Members can access the group without being prompted for a password. You should use the same list of users as in /etc/group. FILES
/etc/group Group account information. /etc/gshadow Secure group account information. SEE ALSO
gpasswd(5), group(5), grpck(8), grpconv(8), newgrp(1). shadow-utils 4.5 01/25/2018 GSHADOW(5)

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