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I want to remove any and all activity logs for SSH remotely. How do I get to it?

My account on the remote server doesn't have admin privilege, and as such I just want to remove user to user connection records.

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16  
This sounds suspicious. :) –  Richard Holloway Aug 18 '11 at 12:28
1  
@Richard, sure it does, but what sounds more suspicious is deleting everything as opposed to just deleting the current session's data. –  Oxwivi Aug 18 '11 at 14:33
    
regarding update: not going to happen. If the admin is worth his salt all logs are world-readable but not editable by any one other than the admin (ie. root or sudo permissions required). –  Rinzwind Aug 18 '11 at 14:45
    
@Rinzwind, nothing is saved in the user directory itself? In the .ssh directory or something, for example. –  Oxwivi Aug 18 '11 at 14:47
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The commands you issued when you have access will be in your bash history file. That's about all I can think of. –  Rinzwind Aug 18 '11 at 14:53

2 Answers 2

up vote 9 down vote accepted

The answer to this lies in sshd.conf and sshd_config (server) and ssh_config (client). Depending on the log level it logs to /var/log/syslog (default) and/or /var/log/auth.log (loglevel 'verbose' contains ssh login attempts).

If present /var/log/secure also contains an access log.

You will need root/sudo access to edit any of these files: they will be word-readable but not world-editable.

Next to that. Besides the login from the ssh daemon the command last also shows (failed) logins from ssh. The information for this command comes from /var/log/wtmp (There will be several more I bet).

And there is also the probability the sysadmin installed auditd or logwatch making it practically impossible to hide activity since they could get a notice based on activity undoing the registration of the ssh activity impossible.

Example of /var/log/auth.log:

Aug 10 10:10:10 rinzwind sshd[3653]: Invalid user text from {ipadress}
Aug 10 10:10:10 rinzwind sshd[3653]: Excess permission or bad ownership on file /var/log/btmp
Aug 10 10:10:10 rinzwind sshd[3653]: error: Could not get shadow information for NOUSER
Aug 10 10:10:10 rinzwind sshd[3653]: Failed password for invalid user test from {ipadress} port {port} ssh2
Aug 10 10:10:10 rinzwind sshd[3653]: Excess permission or bad ownership on file /var/log/btmp
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Updated question. –  Oxwivi Aug 18 '11 at 14:43
    
By the way, just what kind of data is logged when SSH connection takes place? IP address for sure, but what else? –  Oxwivi Aug 18 '11 at 14:44
    
No username recorded? –  Oxwivi Aug 18 '11 at 15:29

You would want to look at /var/log/messages and/or /var/log/syslog.

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