ssh_mailer

Sends e-mail whenever someone logs in to SSH (Triggers via PAM)

Installation

Copy ssh_mailer.py to /usr/bin/ and chmod +x /usr/bin/ssh_mailer.py.
Then add the following to /etc/pam.d/sshd:

session   optional  pam_exec.so seteuid /usr/bin/ssh_mail.py

Then create certificates:

mkdir -p /etc/sshmailer
openssl genrsa -out /etc/sshmailer/sshmailer.pem 1024
openssl rsa -in /etc/sshmailer/sshmailer.pem -out /etc/sshmailer/sshmailer.pub -pubout
chmod 440 /etc/sshmailer/sshmailer.*

And copy the public part of the cert (without the --- BEGIN --- parts) into your DNS TXT record, which should look something like:

cat /etc/sshmailer/sshmailer.pub
INSERT INTO records (name, type, content) VALUES ('default._domainkey.hvornum.se', 'TXT', 'v=DKIM1;k=rsa;p=MIGfMA+PUejXCfAQAB');

Now, whenever you login via SSH, PAM should execute ssh_mail.py