Ho una configurazione del server Ubuntu che utilizza l'istanza di amazon ec2. Devo collegare il mio desktop (che è anche una macchina Ubuntu) al server Ubuntu usando SSH.
Ho installato open-ssh nel server Ubuntu. Ho bisogno di tutti i sistemi della mia rete per connettere il server Ubuntu tramite SSH (non è necessario connettersi tramite chiavi pem o pub).
Quindi ho aperto la porta SSH 22 per il mio IP statico nei gruppi di sicurezza (AWS).
Il mio file SSHD-CONFIG è:
# 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
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes
# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
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 no
# 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
Tramite webmin (Command shell), ho creato un nuovo utente chiamato "senthil" e ho aggiunto questo nuovo utente al gruppo "sudo".
sudo adduser -y senthil
sudo adduser senthil sudo
Ho provato ad accedere usando questo nuovo utente "senthil" in "webmin". Sono stato in grado di accedere con successo.
Quando ho provato a connettere il server Ubuntu dal mio terminale tramite SSH,
ssh senthil@SERVER_IP
Mi ha chiesto di inserire la password. Dopo l'immissione della password, è visualizzato:
Permission denied, please try again.
In alcune ricerche mi sono reso conto che per questo ho bisogno di monitorare il registro di autenticazione del mio server. Ho ricevuto il seguente errore nel mio registro di autenticazione (/var/log/auth.log)
Jul 2 09:38:07 ip-192-xx-xx-xxx sshd[3037]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=MY_CLIENT_IP user=senthil
Jul 2 09:38:09 ip-192-xx-xx-xxx sshd[3037]: Failed password for senthil from MY_CLIENT_IP port 39116 ssh2
Quando ho provato a eseguire il debug utilizzando:
ssh -v senthil@SERVER_IP
OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to SERVER_IP [SERVER_IP] port 22.
debug1: Connection established.
debug1: identity file {MY-WORKSPACE}/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file {MY-WORKSPACE}/.ssh/id_rsa-cert type -1
debug1: identity file {MY-WORKSPACE}/.ssh/id_dsa type -1
debug1: identity file {MY-WORKSPACE}/.ssh/id_dsa-cert type -1
debug1: identity file {MY-WORKSPACE}/.ssh/id_ecdsa type -1
debug1: identity file {MY-WORKSPACE}/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.8p1 Debian-7ubuntu1
debug1: match: OpenSSH_5.8p1 Debian-7ubuntu1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA {SERVER_HOST_KEY}
debug1: Host 'SERVER_IP' is known and matches the ECDSA host key.
debug1: Found key in {MY-WORKSPACE}/.ssh/known_hosts:1
debug1: ssh_ecdsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: password
debug1: Next authentication method: password
senthil@SERVER_IP's password:
debug1: Authentications that can continue: password
Permission denied, please try again.
senthil@SERVER_IP's password:
Per la password, ho inserito lo stesso valore che utilizzo normalmente per l'utente 'ubuntu'.
Qualcuno può guidarmi dove si trova il problema e suggerire qualche soluzione per questo problema?
ubuntu
utente? E sei sicuro di averlo digitato correttamente? Includi anche l'output diid ubuntu
run dal tuo server nella tua domanda. Forse hai bloccato l'account? Valuta di includere l'output digrep ^ubuntu /etc/passwd /etc/shadow
(e modifica la password crittografata solo al centro della stringa).