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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 #40
Difficulty: Easy
HTML stands for 'Hyper Technology Transfer Protocol'.
True or False?

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d_passwd(4)							   File Formats 						       d_passwd(4)

NAME
d_passwd - dial-up password file SYNOPSIS
/etc/d_passwd DESCRIPTION
A dial-up password is an additional password required of users who access the computer through a modem or dial-up port. The correct pass- word must be entered before the user is granted access to the computer. d_passwd is an ASCII file which contains a list of executable programs (typically shells) that require a dial-up password and the associ- ated encrypted passwords. When a user attempts to log in on any of the ports listed in the dialups file (see dialups(4)), the login program looks at the user's login entry stored in the passwd file (see passwd(4)), and compares the login shell field to the entries in d_passwd. These entries determine whether the user will be required to supply a dial-up password. Each entry in d_passwd is a single line of the form: login-shell:password: where login-shell The name of the login program that will require an additional dial-up password. password An encrypted password. Users accessing the computer through a dial-up port or modem using login-shell will be required to enter this password before gaining access to the computer. d_passwd should be owned by the root user and the root group. The file should have read and write permissions for the owner (root) only. If the user's login program in the passwd file is not found in d_passwd or if the login shell field in passwd is empty, the user must sup- ply the default password. The default password is the entry for /usr/bin/sh. If d_passwd has no entry for /usr/bin/sh, then those users whose login shell field in passwd is empty or does not match any entry in d_passwd will not be prompted for a dial-up password. Dial-up logins are disabled if d_passwd has only the following entry: /usr/bin/sh:*: EXAMPLES
Example 1: Sample d_passwd file. Here is a sample d_passwd file: /usr/lib/uucp/uucico:q.mJzTnu8icF0: /usr/bin/csh:6k/7KCFRPNVXg: /usr/bin/ksh:9df/FDf.4jkRt: /usr/bin/sh:41FuGVzGcDJlw: Generating An Encrypted Password The passwd (see passwd(1)) utility can be used to generate the encrypted password for each login program. passwd generates encrypted pass- words for users and places the password in the shadow (see shadow(4)) file. Passwords for the d_passwd file will need to be generated by first adding a temporary user id using useradd (see useradd(1M)), and then using passwd(1) to generate the desired password in the shadow file. Once the encrypted version of the password has been created, it can be copied to the d_passwd file. For example: 1. Type useradd tempuser and press Return. This creates a user named tempuser. 2. Type passwd tempuser and press Return. This creates an encrypted password for tempuser and places it in the shadow file. 3. Find the entry for tempuser in the shadow file and copy the encrypted password to the desired entry in the d_passwd file. 4. Type userdel tempuser and press Return to delete tempuser. These steps must be executed as the root user. FILES
/etc/d_passwd dial-up password file /etc/dialups list of dial-up ports requiring dial-up passwords /etc/passwd password file /etc/shadow shadow password file SEE ALSO
passwd(1), useradd(1M), dialups(4), passwd(4), shadow(4) WARNINGS
When creating a new dial-up password, be sure to remain logged in on at least one terminal while testing the new password. This ensures that there is an available terminal from which you can correct any mistakes that were made when the new password was added. SunOS 5.10 2 Sep 2004 d_passwd(4)

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