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Top Forums UNIX for Dummies Questions & Answers Message in /var/log/messages: Cannot do reverse lookup Post 302346282 by mojoman on Friday 21st of August 2009 11:42:39 AM
Old 08-21-2009
Message in /var/log/messages: Cannot do reverse lookup

Hi I have an entry in hosts.deny and now I get the following message in /var/log/messages:

g 21 09:30:46 machine sshd[12441]: Failed password for illegal user d from ::ffff:213.229.69.42 port 57181 ssh2
Aug 21 09:30:46 machine sshd[12441]: Received disconnect from ::ffff:213.229.69.42: 11: Bye Bye
Aug 21 09:30:46 machine sshd[12442]: warning: /etc/hosts.deny, line 6: can't verify hostname: getaddrinfo(213-229
-69-42.static.as29550.net): Name or service not known
Aug 21 09:30:47 machine sshd[12442]: Illegal user d from ::ffff:213.229.69.42
Aug 21 09:30:47 machine sshd[12442]: input_userauth_request: illegal user d
Aug 21 09:30:47 machine sshd[12442]: reverse mapping checking getaddrinfo for 213-229-69-42.static.as29550.net fa
iled - POSSIBLE BREAKIN ATTEMPT!

Why is the box trying to do a look up for 213-229-69-442. Shouldn't it be looking for 213.229.69.442? Or are the -'s just proper syntax?
 

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SSS_SSH_AUTHORIZEDKE(1) 					 SSSD Manual pages					   SSS_SSH_AUTHORIZEDKE(1)

NAME
sss_ssh_authorizedkeys - get OpenSSH authorized keys SYNOPSIS
sss_ssh_authorizedkeys [options] USER DESCRIPTION
sss_ssh_authorizedkeys acquires SSH public keys for user USER and outputs them in OpenSSH authorized_keys format (see the "AUTHORIZED_KEYS FILE FORMAT" section of sshd(8) for more information). sshd(8) can be configured to use sss_ssh_authorizedkeys for public key user authentication if it is compiled with support for either "AuthorizedKeysCommand" or "PubkeyAgent" sshd_config(5) options. If "AuthorizedKeysCommand" is supported, sshd(8) can be configured to use it by putting the following directive in sshd_config(5): AuthorizedKeysCommand /usr/bin/sss_ssh_authorizedkeys If "PubkeyAgent" is supported, sshd(8) can be configured to use it by using the following directive for sshd(8) configuration: PubKeyAgent /usr/bin/sss_ssh_authorizedkeys %u This is an experimental feature, please use http://fedorahosted.org/sssd to report any issues. OPTIONS
-d,--domain DOMAIN Search for user public keys in SSSD domain DOMAIN. -h,--help Display help message and exit. SEE ALSO
sshd(8), sshd_config(5), sss_ssh_knownhostsproxy(1). AUTHORS
The SSSD upstream - http://fedorahosted.org/sssd SSSD
03/04/2013 SSS_SSH_AUTHORIZEDKE(1)
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