Upgrading OpenSSL

This one works for me on upgrading openssl.

1. Check your openssl version

# openssl version

OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008

2. Download latest version of openssl

http://www.openssl.org/source/

or you may command

wget http://www.openssl.org/source/openssl-1.0.0d.tar.gz

3. Extract openssl-1.0.0d.tar.gz

Go to openssl-1.0.0d directory

# make clean
# ./config shared –prefix=/usr –openssldir=/usr/local/openssl
# make && make test
# make install

4. Done

5. Check the if you you have the latest version

# openssl version

OpenSSL 1.0.0d 8 Feb 2011

Enjoy….. ^__^

Daily Site Tools

Site you can use for domain info, IP, mx records, Blacklist etc..

http://www.intodns.com – DNS lookup
http://www.mxtoolbox.com – Mx lookup, Blacklist & other info
http://cqcounter.com/whois – IP lookup
http://www.dnsbl.info – Blacklist lookup
whois.domaintools.com – DNS lookup

Suggest your daily site lookup that can help us.
Thanks

Delete user and directory

This script check the user if available if yes will prompt to delete the user and the directory.

#***********************************************************************

#!/bin/bash
#Script by Jeffrey Dante

#Check User if available

if [ $(id -u) -eq 0 ]; then
echo “Checking user $1″
cat /etc/passwd | awk -F: ‘{print $1}’ | grep -w $1
if [ $? -eq 0 ]; then

#Check User Disk Usage
LETTER=`/bin/echo $1 | /bin/awk ‘BEGIN{FS=””}{print $1}’`
DU=/usr/bin/du
echo “Disk Usage:”
$DU -msh /mnt/emaildata/$LETTER/$1/Maildir | awk ‘{print $1}’

while true;
do
read -p “Do you wish to delete this user $1 ? ”  yn
case $yn in
[Yy]* ) userdel $1; rm -r /mnt/emaildata/$LETTER/$1; echo “User $1 has been deleted”; exit;;
[Nn]* ) exit;;
* ) echo “Please answer yes or no.”;;
esac
done

exit 1

else
echo “$1 does not exists!”
fi

else
echo “Only root may delete a user”
exit 2
fi

#***********************************************************************

Script to add user and alias

I have seen similar script like this, I just added some arguments to make it suffice.

#**************************************************************************

#!/bin/bash
# Script to add a user with password and alias
# Jeffrey Dante

ADDUSER=/usr/sbin/adduser

if [ $(id -u) -eq 0 ]; then
read -p “Enter username : ” username
read -p “Enter email address: ” email
read -s -p “Enter password : ” password
egrep “^$username” /etc/passwd >/dev/null
egrep “^$email” /etc/aliases >/dev/null
if [ $? -eq 0 ]; then
echo “$username already exists!”
echo “$email already exist!”
echo “Make it sure that you do not have desame username and emaill address!”
exit 1
else
pass=$(perl -e ‘print crypt($ARGV[0], “password”)’ $password)
$ADDUSER -s /sbin/nologin -m -p $pass $username -G 100 $1
echo -e “$email:\t$username” >> /etc/aliases
echo -e “$email” >> /usr/files/addresses.txt
[ $? -eq 0 ] && echo “User has been added to system!” || echo “Failed to add a user!”

fi
else
echo “Only root may add a user to the system”
exit 2
fi
#**************************************************************************

Check User Script

I have created check user script to list the username, email alias, and the disk usage of the user. I hope this will give you some ideas preparing your own check user script.

#***********************************************************************
#!/bin/bash
#Script by Jeffrey Dante
#Check User if available
#List the email alias
#Show the directory usage

if [ $(id -u) -eq 0 ]; then
cat /etc/passwd | awk -F: ‘{print $1}’ | grep -w $1
if [ $? -eq 0 ]; then

# email: username
cat /etc/aliases | grep -w $1 | awk -F: ‘{print $1}’

# Check User Disk Usage

LETTER=`/bin/echo $1 | /bin/awk ‘BEGIN{FS=””}{print $1}’`
DU=/usr/bin/du
echo “Disk Usage:”
$DU -msh /mnt/emaildata/$LETTER/$1/Maildir | awk ‘{print $1}’

exit 1

else
echo “$1 does not exists!”
fi

else
echo “User verification Done!”
exit 2
fi

#***********************************************************************

Output should look like this
user
email/s
usage

[root@test.com jedscripts]# ./usercheck.sh jepdante
jepdante
jeffrey.dante@test.com
jeffrey_dante@test.com
Disk Usage:
55M

Listing email alias & user from /etc/aliases on Linux

You may try this code should you want to list the email address from /etc/aliases

cat /etc/aliases | grep -w $1 | awk -F: ‘{print $1}’

Output:
jepdante@yahoo.com

or email and user

cat /etc/aliases | grep -w $1 | awk ‘{print $1,$2}’

Output:
jepdante@yahoo.com: jepdan03

Installing openssl

To install openssl you can just do

yum install openssl

Or to update or do it manually:

1. check version
[root@test ]# openssl version
OpenSSL 0.9.7a Feb 19 2003

or

[root@test ]# openssl
OpenSSL> version
OpenSSL 0.9.7a Feb 19 2003

2. download latest openssl
3. extract

tar -zxvf openssl-1.0.0d.tar.gz

4. go to directory

cd openssl-1.0.0d

5. configure

./config shared –prefix=/usr –openssldir=/usr/local/openssl
make && make test
make install

6. if ask perl 5

yum install perl-DBI

Grep & Tar Linux Command for email on selected user

A. GREP

To grep the email by year and ouput its total email

ls –full-time | grep “2010\\-” | wc -l

To grep the email by year and month. ex 2010-01

ls –full-time | grep “2010\\-01\\-”

To grep the email by year, month and date. ex 2010-01-22

ls –full-time | grep “2010\\-01\\-22”

To grep the email by year, month, date and hour. ex 2010-01-22 10am

ls –full-time | grep “2010\\-01\\-22\\ 10”

B. TAR – backup

To Tar it with extension of .tar.gz

tar -cvzf 2010-04-27-18h.tar.gz `ls –full-time | grep “2010\\-04\\-27\\ 18” | awk ‘{print $9}’`
C. Untar

To Untar it, just go to the directory you want to extract it.

tar -xvf 2010-04-27-18h.tar.gz

ClamAV Installation

1. Download latest package
# useradd -s /sbin/nologin -c “Clam AV” clamav
# tar -zxvf clamav-0.96.3.tar.gz
# cd clamav-0.96.3
# ./configure
note: install package needed first and do ./configure again
yum install gcc-c++
yum install zlib-devel
# make && make install

2. Edit config file located at /usr/local/etc (clamd.conf and freshclam.conf)
for clamd.conf
# vi /usr/local/etc/clamd.conf
comment # example
comment # LocalSocket /tmp/clamd
comment # FixStaleSocket
uncomment TCPSocket 3310

for freshclam.conf
# vi /usr/local/etc/freshclam.conf
comment # example

3. Run freshclam to update virus definition files
# freshclam

NOTE: copy the init file for automatic start in bootup

# /usr/local/sbin/clamd -c /usr/local/etc/clamd.conf

4. # cp clamd /etc/init.d/clamd
note: —–-script to start clamd

# chmod u+x /etc/init.d/clamd
note: —–executable

BACKUP USING RSYNC & SSH With no password (FEDORA 15)

This one helps me a lot easier backing up the files from one server to backup server without password prompt.

Thanks to Lubos Rendek on his post at http://linuxconfig.org/Passwordless_ssh you make my life easier hahahah.

Follow the steps below
1. Generate ssh key on Local Server

[admin@localserver .ssh]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/admin/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/admin/.ssh/id_rsa.
Your public key has been saved in /home/admin/.ssh/id_rsa.pub.
The key fingerprint is:
12:d7:c2:24:18:07:ac:49:25:34:d0:f1:ed:e5:5a:6e admin@localserver
The key’s randomart image is:
+–[ RSA 2048]—-+
|.+=+++o .        |
|  o+oo + .       |
| . o. o = .      |
|  o  . = .       |
|      o S        |
|       =         |
|      . E        |
|       .         |
|                 |
+—————–+

2. Check the file if properly generated

[admin@localserver .ssh]$ ls -la
total 20
drwx——.  2 admin admin 4096 Aug 19 11:40 .
drwx——. 32 admin admin 4096 Aug 19 11:37 ..
-rw——-.  1 admin admin 1679 Aug 19 11:40 id_rsa
-rw-r–r–.  1 admin admin  400 Aug 19 11:40 id_rsa.pub
-rw-r–r–.  1 admin admin 2740 Aug 18 14:52 known_hosts

3. Copy ssh id to Backup Server

[admin@localserver .ssh]$ ssh-copy-id admin@backupserver
admin@backupserver’s password:
Now try logging into the machine, with “ssh ‘admin@backupserver'”, and check in:

~/.ssh/authorized_keys

to make sure we haven’t added extra keys that you weren’t expecting.

4. Login to Backup Server

[admin@localserver .ssh]$ ssh admin@backupserver
Last login: Thu Aug 18 17:22:33 2011 from 192.168.1.7
[admin@backupserver~]$ logout
Connection to backupserver closed.
[admin@localserver .ssh]$

5. Create Backup Script

[admin@localserver Downloads]$ vi new-rsync.sh

#!/bin/bash
RSYNC=/usr/bin/rsync
$RSYNC -ave ssh /home/admin/Downloads/temp admin@backupserver:/home/admin/Documents

6. Save the script (:wq!)
chown 755 new-rsync.sh

7. Test the script

[admin@localserver Downloads]$ ./new-rsync.sh
sending incremental file list

sent 87 bytes  received 13 bytes  66.67 bytes/sec
total size is 5309440  speedup is 53094.40

8. Create Cronjob

crontab -e

add

# BACKUP
00 00 * * * /home/admin/Downloads/new-rsync.sh

Done!