 PermitEmptyPasswords.       -
   .    .

 PermitRootLogin.   root      -
 OpenSSH.        .
   yes.

 StrictModes yes | no.        
 .  ,       
 / .       yes ( -
).

 VerifyReverseMapping yes | no. ,    
(.  "  "  24) IP-   
,    .     .

 XHForwarding yes | no.    yes,   XI 1.
   ,     Red Hat
XllForwarding   yes.    XII  -
     -/.ssh/config  /etc/ssh/ssh_config
(.  "ForwardXIl"   "  -/.ssh/config 
/etc/ssh/ssh_config"  ) ForwardXIl     yes. 
        -
   XII.

 

 .   ,     -
 ,   ssh  scp.    ,  
sshd,   /var/log/secure  /var/log/messages  .   -
  AllowUsers,      , 
  ,     :

# grep sshd /var/log/secure

grape sshd[16]: User sam not allowed because not listed in AllowUsers
(grape sshd[16]:  sam   ,   
   AllowUsers)

grape sshd[16]: Failed password for illegal user sam from 192.168.0.6 port
59276 ssh2

(grape sshd[16]:      sam 
192.168.0.6  59276 ssh2)

     (.  ""  11)  -
,     .

# grep sshd /var/log/messages

grape sshd(pam_unix)[2817]: check pass; user unknown

grape sshd(pam_unix)[2817]: authentication failure; logname= uid=0

euid=0 tty=NODEVssh ruser= rhost=peach.sobell.com

 .         , -
     -v (ssh  scp,   
). OpenSSH     ,   
    .

 18. OpenSSH:                            599