Esecuzione di una variante debian (osmc)
Cosa sto cercando di fare:
- Disabilita ssh tramite password, richiedendo sia la chiave che l'autenticatore di Google; Funziona tutto
- Ma ora sto cercando di richiedere l'autenticazione a 2 fattori solo dall'esterno della rete locale (è più facile per
script di backup ma se c'è un altro modo migliore per farlo, per favore
dillo)
Attualmente sto usando stucco e spettacolo da una finestra di Windows per testare, nel caso sia rilevante
Quindi sto usando la soluzione qui:https://serverfault.com/questions/799657/ssh-google-authenticator-ignore-whitelist-ips
Cosa sta succedendo ora –
Quando mi collego dall'esterno della rete, è ancora richiesta l'autenticazione a 2 fattori come richiesto
Dall'interno della rete sembra che riconosca la chiave ma poi si verifica un errore con "Ulteriore autenticazione richiesta".
Molte grazie in anticipo per qualsiasi aiuto
sudo systemctl status ssh
Aug 25 19:51:36 mosmc sshd[10528]: error: PAM: Permission denied for osmc from beast
Aug 25 19:51:36 mosmc sshd[10528]: Failed keyboard-interactive/pam for osmc from 192.168.21.3 port 54330 ssh2
Aug 25 19:51:36 mosmc sshd[10528]: error: Received disconnect from 192.168.21.3: 14: No supported authentication methods available [preauth]
Cat of files di seguito (dove menziona uno script che ho appena scritto per l'installazione di questo media box mentre il mio pasticcio continua a romperlo)
[email protected]:~$ 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 XXXXXXX #changed by sshinstall
# 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
# Inserted hostkeys by ssh-install script
HostKey /etc/ssh/ssh_host_ed25519_key
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
KexAlgorithms [email protected],ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256
Ciphers [email protected],[email protected],[email protected],aes256-ctr,aes192-ctr,aes128-ctr
MACs [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,[email protected]
#End of inserted code
#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 VERBOSE #edited by script
# Inserted ftp by ssh-install script
# Log sftp level file access (read/write/etc.) that would not be easily logged otherwise.
Subsystem internal-sftp /usr/lib/ssh/sftp-server -f AUTHPRIV -l INFO
#End of inserted code
# Authentication:
LoginGraceTime 120
PermitRootLogin no #edited by script
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 yes #edited by script
# Change to no to disable tunnelled clear text passwords
PasswordAuthentication no #edited by script
# 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_*
# 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'.
# Inserted google-auth settings by ssh-install script
AuthenticationMethods publickey,keyboard-interactive:pam
KbdInteractiveAuthentication yes
# Ensure /bin/login is not used so that it cannot bypass PAM settings for sshd.
UseLogin no
#End of inserted code
UsePAM yes
access-local.conf
[email protected]:~$ cat /etc/security/access-local.conf
# only allow from local IP range
+ : ALL : 192.168.21.0/24
+ : ALL : LOCAL
- : ALL : ALL
pam.d
[email protected]:~$ cat /etc/pam.d/sshd
# PAM configuration for the Secure Shell service
# Inserted PAM settings by ssh-install script
auth [success=1 default=ignore] pam_access.so accessfile=/etc/security/access-local.conf
auth required pam_google_authenticator.so
#End of inserted code
# Standard Un*x authentication.
#@include common-auth #commented out by sshinstall
# Disallow non-root logins when /etc/nologin exists.
account required pam_nologin.so
# Uncomment and edit /etc/security/access.conf if you need to set complex
# access limits that are hard to express in sshd_config.
# account required pam_access.so
# Standard Un*x authorization.
@include common-account
# SELinux needs to be the first session rule. This ensures that any
# lingering context has been cleared. Without this it is possible that a
# module could execute code in the wrong domain.
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close
# Set the loginuid process attribute.
session required pam_loginuid.so
# Create a new session keyring.
session optional pam_keyinit.so force revoke
# Standard Un*x session setup and teardown.
@include common-session
# Print the message of the day upon successful login.
# This includes a dynamically generated part from /run/motd.dynamic
# and a static (admin-editable) part from /etc/motd.
session optional pam_motd.so motd=/run/motd.dynamic
session optional pam_motd.so noupdate
# Print the status of the user's mailbox upon successful login.
session optional pam_mail.so standard noenv # [1]
# Set up user limits from /etc/security/limits.conf.
session required pam_limits.so
# Read environment variables from /etc/environment and
# /etc/security/pam_env.conf.
session required pam_env.so # [1]
# In Debian 4.0 (etch), locale-related environment variables were moved to
# /etc/default/locale, so read that as well.
session required pam_env.so user_readenv=1 envfile=/etc/default/locale
# SELinux needs to intervene at login time to ensure that the process starts
# in the proper default security context. Only sessions which are intended
# to run in the user's context should be run after this.
session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open
# Standard Un*x password updating.
@include common-password
Risposta accettata:
auth [success=done default=ignore] pam_access.so accessfile=/etc/security/access-local.conf
Sembra essere la risposta. Modifica questo mentre imparo di più.
Correlati:Ubuntu - Come uscire da ssh quando si blocca?Da http://linux-pam.org/Linux-PAM-html/sag-configuration-file.html
successo=fatto
done
equivale a ok con l'effetto collaterale di terminare il modulo
stack e PAM tornare immediatamente all'applicazione.
default=ignora
ignora
se utilizzato con uno stack di moduli, lo stato di ritorno del modulo non contribuirà al codice di ritorno ottenuto dall'applicazione.
da – https://serverfault.com/questions/134471/success-n-control-syntax-in-pam-conf-pam-d-files#134488
success=1 salta una riga.
Se qualcun altro vuole scrivere una risposta migliore che spieghi cosa sta succedendo, lo accetterò felicemente.
Grazie a Hostfission per avermi indicato la parte giusta.