Where is the sshd log file on Red Hat Linux stored?

Solution 1:

Login records are usually in /var/log/secure. I don't think there is a log specific to the SSH daemon process, unless you've broken it out from other syslog messages.

Solution 2:

In addition to @john answer, some distributions are now using journalctl by default. If that's your case, you're probably able to see sshd activity through:

_> journalctl _COMM=sshd

You will see output like this:

Abr 15 02:28:17 m sshd[26284]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Abr 15 02:28:18 m sshd[26284]: Failed password for root from 127.0.0.1 port **** ssh2
Abr 15 02:28:19 m sshd[26284]: Connection closed by 127.0.0.1 [preauth]
Abr 15 02:28:25 m sshd[26296]: Accepted password for **** from 127.0.0.1 port **** ssh2
Abr 15 02:28:25 m sshd[26296]: pam_unix(sshd:session): session opened for user **** by (uid=0)
Abr 15 02:28:28 m sshd[26301]: Received disconnect from 127.0.0.1: 11: disconnected by user
Abr 15 02:28:58 m sshd[26231]: Received signal 15; terminating.
Abr 15 02:28:58 m sshd[26828]: Server listening on 0.0.0.0 port 22.

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Solution 3:

The log is in fact located at /var/log/secure on RHEL systems. A SSHD connection will look something like this;

Jan 10 09:49:04 server sshd[28651]: Accepted publickey for [username] from x.x.x.x port 61000 ssh2
Jan 10 09:49:04 server sshd[28651]: pam_unix(sshd:session): session opened for user [username] by (uid=0)

The most important part for determining whether or not your account has been compromised is the IP Address.