Jul 29 09:02:29 machinename sshd[30173]: Accepted password for username from ::ffff:192.168.0.1 port 39664 ssh2
Jul 29 09:02:29 machine sshd(pam_unix)[9312]: session opened for user username by (uid=500)
[...]
Jul 29 09:07:35 machine sshd(pam_unix)[7137]: session closed for user username