Date: Fri, 12 Jan 2007 23:39:36 +0100 From: VeeJay <maanjee@gmail.com> To: "Reko Turja" <reko.turja@liukuma.net> Cc: FreeBSD-Questions <freebsd-questions@freebsd.org> Subject: Re: Please Help! How to STOP them... Message-ID: <2cd0a0da0701121439m3660773eh96352826a3cb01b8@mail.gmail.com> In-Reply-To: <2cd0a0da0701121425r2db393b0n8f21289c0bd48970@mail.gmail.com> References: <2cd0a0da0701121343g7fa2535fv4a7b201f5a03aff2@mail.gmail.com> <01f401c73694$417d7830$0a0aa8c0@rivendell> <2cd0a0da0701121425r2db393b0n8f21289c0bd48970@mail.gmail.com>
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What should be ENABLED and what should be DISABLED? # $OpenBSD: sshd_config,v 1.74 2006/07/19 13:07:10 dtucker Exp $ # $FreeBSD: src/crypto/openssh/sshd_config,v 1.42.2.4 2006/11/11 00:51:28 des Exp $ # This is the sshd server system-wide configuration file. See # sshd_config(5) for more information. # This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin # The strategy used for options in the default sshd_config shipped with # OpenSSH is to specify options with their default value where # possible, but leave them commented. Uncommented options change a # default value. # Note that some of FreeBSD's defaults differ from OpenBSD's, and # FreeBSD has a few additional options. #VersionAddendum FreeBSD-20061110 #Port 22 #Protocol 2 #AddressFamily any #ListenAddress 0.0.0.0 #ListenAddress :: # HostKey for protocol version 1 #HostKey /etc/ssh/ssh_host_key # HostKeys for protocol version 2 #HostKey /etc/ssh/ssh_host_dsa_key # Lifetime and size of ephemeral version 1 server key #KeyRegenerationInterval 1h #ServerKeyBits 768 # Logging # obsoletes QuietMode and FascistLogging #SyslogFacility AUTH #LogLevel INFO # Authentication: #LoginGraceTime 2m #PermitRootLogin no #StrictModes yes #MaxAuthTries 6 #RSAAuthentication yes #PubkeyAuthentication yes #AuthorizedKeysFile .ssh/authorized_keys # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts #RhostsRSAAuthentication no # similar for protocol version 2 #HostbasedAuthentication no # Change to yes if you don't trust ~/.ssh/known_hosts for # RhostsRSAAuthentication and HostbasedAuthentication #IgnoreUserKnownHosts no # Don't read the user's ~/.rhosts and ~/.shosts files #IgnoreRhosts yes # Change to yes to enable built-in password authentication. #PasswordAuthentication no #PermitEmptyPasswords no # Change to no to disable PAM authentication #ChallengeResponseAuthentication yes # Kerberos options #KerberosAuthentication no #KerberosOrLocalPasswd yes #KerberosTicketCleanup yes #KerberosGetAFSToken no # GSSAPI options #GSSAPIAuthentication no #GSSAPICleanupCredentials yes # Set this to 'no' to disable PAM authentication, account processing, # and session processing. If this is enabled, PAM authentication will # be allowed through the ChallengeResponseAuthentication and # PasswordAuthentication. Depending on your PAM configuration, # PAM authentication via ChallengeResponseAuthentication may bypass # the setting of "PermitRootLogin without-password". # If you just want the PAM account and session checks to run without # PAM authentication, then enable this but set PasswordAuthentication # and ChallengeResponseAuthentication to 'no'. #UsePAM yes #AllowTcpForwarding yes #GatewayPorts no #X11Forwarding yes #X11DisplayOffset 10 #X11UseLocalhost yes #PrintMotd yes #PrintLastLog yes #TCPKeepAlive yes #UseLogin no #UsePrivilegeSeparation yes #PermitUserEnvironment no #Compression delayed #ClientAliveInterval 0 #ClientAliveCountMax 3 #UseDNS yes #PidFile /var/run/sshd.pid #MaxStartups 10 #PermitTunnel no # no default banner path #Banner /some/path # override default of no subsystems Subsystem sftp /usr/libexec/sftp-server # Example of overriding settings on a per-user basis #Match User anoncvs # X11Forwarding no # AllowTcpForwarding no # ForceCommand cvs server What steps need to follow? On 1/12/07, VeeJay <maanjee@gmail.com> wrote: > > Thanks Reko.... > > Just couple of more questions... > > > On 1/12/07, Reko Turja <reko.turja@liukuma.net> wrote: > > > > From: "VeeJay" <maanjee@gmail.com> > > To: < maanjee@gmail.com>; "FreeBSD-Questions" > > <freebsd-questions@freebsd.org> > > Sent: Friday, January 12, 2007 11:43 PM > > Subject: Please Help! How to STOP them... > > > > > > >I am reading many hundred lines similar to below mentioned? > > > > > > Could you please advise me what to do and how can I make my box more > > > secure? > > > > > > Jan 9 17:54:42 localhost sshd[5130]: reverse mapping checking > > > getaddrinfo > > > for bbs-83-179.189.218.on-nets.com [218.189.179.83] failed - > > > POSSIBLE > > > BREAK-IN ATTEMPT! > > > Jan 9 17:54:42 localhost sshd[5130]: Invalid user sysadmin from > > > 218.189.179.83 > > > > It's basically just script kiddies trying to get in using some ready > > made user/password pairs. > > > > Lots of info covering this has been posted in these newsgroups > > previously, but some things you might consider > > > > Moving your sshd port somewhere else than 22 - the prepackaged > > "cracking" programs don't scan ports, just blindly try out the default > > port - with determined/skilled attacker it's different matter entirely > > though. > > > How to change the port from 22 to something other and in what range should > I choose a number? > > > Use some kind of portblocker (lots in ports tree) which closes the > > port after predetermined number of attempts - or as an alternative, > > use PF to close the port for IP's in question after predetermined > > number of connection attempts in given time. > > > Can you suggest such port which I should install to block these attempts? > > Use key based authentication and stop using passwords altogether. > > > What do you mean here? > > Remember to keep ssh1 disabled as well as direct root access into ssh > > from the ssh config file. > > > How to disable SSH1 and How to stop direct root access into ssh, where to > change? > > -Reko > > > > > > > -- > Thanks! > > BR / vj -- Thanks! BR / vj
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