Forum Debian Users Gang

root@debian:/home/marek# cat /etc/ssh/sshd_config
# Package generated configuration file
# See the sshd_config(5) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 1024

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
#PermitRootLogin without-password
PermitRootLogin-yes
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile    %h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
  PermitEmptyPasswords  yes 

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

Subsystem sftp /usr/lib/openssh/sftp-server

# Set this to 'yes' to enable 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
root@debian:/home/marek#

/etc/init.d/ssh restart

PermitRootLogin-yes

marek@debian:~$ su
Hasło: 
root@debian:/home/marek# nano /etc/ssh/sshd_config
root@debian:/home/marek# /etc/init.d/ssh restart
[ ok ] Restarting ssh (via systemctl): ssh.service.
root@debian:/home/marek# ssh root@192.168.1.104
Read from socket failed: Connection reset by peer
root@debian:/home/marek# ssh root@192.168.1.104:22
ssh: Could not resolve hostname 192.168.1.104:22: Name or service not known
root@debian:/home/marek#

root@debian:/home/marek# sshd -t
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0755 for '/etc/ssh/ssh_host_rsa_key' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
key_load_private: bad permissions
Could not load host key: /etc/ssh/ssh_host_rsa_key
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0755 for '/etc/ssh/ssh_host_dsa_key' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
key_load_private: bad permissions
Could not load host key: /etc/ssh/ssh_host_dsa_key
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0755 for '/etc/ssh/ssh_host_ecdsa_key' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
key_load_private: bad permissions
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0755 for '/etc/ssh/ssh_host_ed25519_key' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
key_load_private: bad permissions
Could not load host key: /etc/ssh/ssh_host_ed25519_key
root@debian:/home/marek#

root@debian:/home/marek# ls -l /etc/ssh/
razem 284
-rw-r--r-- 1 root root 242091 sty 13 22:19 moduli
-rw-r--r-- 1 root root   1690 sty 13 22:19 ssh_config
-rw-r--r-- 1 root root   2567 cze 13 14:13 sshd_config
-rw-r--r-- 1 root root   2438 cze 13 09:02 sshd_config.save.1
-rw------- 1 root root    668 cze 11 12:57 ssh_host_dsa_key
-rw-r--r-- 1 root root    601 cze 11 12:57 ssh_host_dsa_key.pub
-rw------- 1 root root    227 cze 11 12:57 ssh_host_ecdsa_key
-rw-r--r-- 1 root root    173 cze 11 12:57 ssh_host_ecdsa_key.pub
-rw------- 1 root root    399 cze 11 12:57 ssh_host_ed25519_key
-rw-r--r-- 1 root root     93 cze 11 12:57 ssh_host_ed25519_key.pub
-rw------- 1 root root   1675 cze 11 12:57 ssh_host_rsa_key
-rw-r--r-- 1 root root    393 cze 11 12:57 ssh_host_rsa_key.pub
root@debian:/home/marek# ssh root@192.168.1.104
The authenticity of host '192.168.1.104 (192.168.1.104)' can't be established.
ECDSA key fingerprint is 0b:ed:3d:d6:4c:43:fb:c2:6a:44:4a:11:56:ed:a3:2c.
Are you sure you want to continue connecting (yes/no)? y
Please type 'yes' or 'no': yes
Warning: Permanently added '192.168.1.104' (ECDSA) to the list of known hosts.
root@192.168.1.104's password: 

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
root@debian:~# sshd -t
root@debian:~#