Cron job - Generating weekly new DH PARAM files

Generating weekly new DH PARAM files

Hello user!


Just create the following directory:


Bash
~# mkdir -p /etc/dhparam



Create file /usr/local/sbin/gen_dhparam with the following content:


Bash
~# touch /usr/local/sbin/gen_dhparam



Set this file executable:


Bash
~# chmod +x /usr/local/sbin/gen_dhparam



Run the script by:


Bash
~# /usr/local/sbin/gen_dhparam



It will take a long time, but 4 files will be generated in /etc/dhparam:


Bash
~# ll /etc/dhparam
total 32
drwxr-xr-x 2 root root 4096 Oct 9 15:38 ./
drwxr-xr-x 127 root root 12288 Oct 10 11:05 ../
-rw-r--r-- 1 root root 156 Oct 10 11:16 dhparam512.pem
-rw-r--r-- 1 root root 245 Oct 10 11:16 dhparam1024.pem
-rw-r--r-- 1 root root 424 Oct 10 11:17 dhparam2048.pem
-rw-r--r-- 1 root root 769 Oct 10 11:58 dhparam4096.pem



After that just create a symlink /etc/cron.weekly/gen_dhparam to the new script:

Code
~# ln -s /usr/local/sbin/gen_dhparam /etc/cron.weekly/



With these permissions and owner:

Bash
~# ll /etc/cron.weekly/gen_dhparam
lrwxrwxrwx 1 root root 27 Sep 14 17:31 /etc/cron.weekly/gen_dhparam -> /usr/local/sbin/gen_dhparam*



Last important and final step is the creation of the weekly scheduled task in Plesk "Home > Tools & Settings > Scheduled Tasks" under root.

Or in other location, dependent on the used operation system and software environment:

Bash
FILE=`mktemp` ; openssl dhparam -out $FILE 512 && mv -f $FILE /etc/dhparam/dhparam512.pem && FILE=`mktemp` ; openssl dhparam -out $FILE 1024 && mv -f $FILE /etc/dhparam/dhparam1024.pem && FILE=`mktemp` ; openssl dhparam -out $FILE 2048 && mv -f $FILE /etc/dhparam/dhparam2048.pem && FILE=`mktemp` ; openssl dhparam -out $FILE 4096 && mv -f $FILE /etc/dhparam/dhparam4096.pem



Generating weekly new DH PARAM files



DH PARAM weekly cron tab


No guarantees as usual. Thanks for watching.


Have fun with Diffie-Hellman (DH) key-exchange.

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