Arch Linux

carbolymer

Member

Registered: 2012-04-25

Posts: 42

Google authenticator + SSH does not ask for the code

I had a working google authenticator + password login over SSH setup working for a year, but something has changed in the recent months and now it does not ask for the code and it always rejects the password. When I try to log in, I'm asked for a password. Entering the password results with access denied in ssh logs. When I enter the PIN code, I'm getting the following in the sshd logs:

Oct 24 22:27:24 blueridge sshd[682285]: pam_access(sshd:auth): access denied for user `mgalazyn' from `x.x.x.x'
Oct 24 22:27:24 blueridge sshd(pam_google_authenticator)[682285]: Accepted google_authenticator for mgalazyn
Oct 24 22:27:24 blueridge sshd[682285]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=x.x.x.x  user=mgalazyn
Oct 24 22:27:26 blueridge sshd[682285]: Failed password for mgalazyn from x.x.x.x  port 20457 ssh2

and I'm still blocked from logging in.

Passwordless login and password login from lan and vpn ip ranges (see configs below) work fine without OTP.

/etc/ssh/sshd_config

# Include drop-in configurations
Include /etc/ssh/sshd_config.d/*.conf

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/local/sbin:/usr/local/bin:/usr/bin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

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

# Authentication:

LoginGraceTime 30
PermitRootLogin no
#StrictModes yes
MaxAuthTries 2
MaxSessions 2

#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile	.ssh/authorized_keys

#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 no to disable s/key passwords
KbdInteractiveAuthentication yes

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

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

# 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 no
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
MaxStartups 5:50:20
PermitTunnel yes
#ChrootDirectory none
#VersionAddendum none

# no default banner path
#Banner none

# override default of no subsystems
Subsystem	sftp	/usr/lib/ssh/sftp-server

# Example of overriding settings on a per-user basis
#Match User anoncvs
#	X11Forwarding no
#	AllowTcpForwarding no
#	PermitTTY no
#	ForceCommand cvs server

/etc/pam.d/sshd                                         

#%PAM-1.0
#auth     required  pam_securetty.so     #disable remote root
auth [success=1 default=ignore] pam_access.so accessfile=/etc/security/access-local.conf
auth      required  pam_google_authenticator.so
auth      include   system-remote-login
account   include   system-remote-login
password  include   system-remote-login
session   include   system-remote-login

/etc/security/access-local.conf

# only allow from local IP range
+ : ALL : 10.0.0.0/24
# Additional network: VPN tunnel ip range (in case you have one)
+ : ALL : 10.10.10.0/24
+ : ALL : 10.10.11.0/24
+ : ALL : LOCAL
- : ALL : ALL

The config follows https://wiki.archlinux.org/title/Google_Authenticator but it does not work for me anymore. Any ideas what could be wrong?