El mié, 23 ago 2023 a las 9:54, Roberto C. Sánchez
(<
[email protected]>) escribió:
En auth.log veo una gran cantidad de mensajes parecido a esto:
2023-08-23T09:48:32.417117-04:00 build01 sshd[3701736]: User root from 103.81.86.208 not allow
ed because not listed in AllowUsers
2023-08-23T09:48:32.685843-04:00 build01 sshd[3701736]: Received disconnect from 103.81.86.208
port 42522:11: Bye Bye [preauth]
2023-08-23T09:48:32.686043-04:00 build01 sshd[3701736]: Disconnected from invalid user root 10
3.81.86.208 port 42522 [preauth]
auth,authpriv.* /var/log/auth.log
Y tengo lo mismo en /etc/rsyslog.conf.
Tiene que haber algo de mal con tu configuración, pero nos haría falta
ver /etc/ssh/sshd_config y /etc/rsyslog.conf (o cualquier cosa que
tienes debajo /etc/rsyslog.d/) para poder prestarte mejor ayuda.
esta es la parte de configuracion de mi sshd_config , fuera de eso no
tengo una configuracion especial ni nada.
Include /etc/ssh/sshd_config.d/*.conf
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key
# Ciphers and keying
#RekeyLimit default none
# Logging
#SyslogFacility AUTH
#LogLevel INFO
LogLevel VERBOSE
# Authentication:
#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
MaxAuthTries 3
#MaxSessions 10
#PubkeyAuthentication yes
# Expect .ssh/authorized_keys2 to be disregarded by default in future. #AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2
#AuthorizedPrincipalsFile none
#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts #HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here! #PasswordAuthentication yes
#PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
KbdInteractiveAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the KbdInteractiveAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via KbdInteractiveAuthentication may bypass
# the setting of "PermitRootLogin prohibit-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and KbdInteractiveAuthentication to 'no'.
UsePAM yes
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
#Banner none
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
# override default of no subsystems
Subsystem sftp /usr/lib/openssh/sftp-server
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# PermitTTY no
# ForceCommand cvs server
lo interesante es que si hago un journalctl -u ssh , veo cantidad de
ataques conexiones a mi ssh , pero no lo registra el auth.log
Aug 23 09:16:30 relay.srv sshd[18068]: error:
kex_exchange_identification: Connection closed by remote ho>
Aug 23 10:29:18 relay.srv sshd[19783]: fatal: Timeout before
authentication for 42.51.227.67 port 25073
Aug 23 10:47:21 relay.srv sshd[20293]: error:
kex_exchange_identification: Connection closed by remote ho>
Aug 23 11:37:39 relay.srv sshd[21528]: error:
kex_exchange_identification: banner line contains invalid c>
Aug 23 11:37:51 relay.srv sshd[21542]: fatal: userauth_pubkey: parse
publickey packet: incomplete message>
Aug 23 12:29:23 relay.srv sshd[22814]: fatal: Timeout before
authentication for 178.74.61.156 port 57086
Aug 23 13:07:27 relay.srv sshd[23768]: error: maximum authentication
attempts exceeded for root from 43.1>
Aug 23 13:07:38 relay.srv sshd[23780]: error: maximum authentication
attempts exceeded for root from 43.1>
Aug 23 15:21:28 relay.srv sshd[27144]: fatal: Timeout before
authentication for 42.225.45.222 port 46344
Aug 23 15:23:44 relay.srv sshd[27240]: fatal: Timeout before
authentication for 187.73.238.82 port 9190
saludos
--
rickygm
http://gnuforever.homelinux.com
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