benjamin-hering · October 27, 2023 16:28
diff --git a/duo-mfa-setup.sh b/duo-mfa-setup.sh
 #!/bin/bash
 #
 #
 # Author: Benjamin Hering - [email protected]
 #
 #
 # Sets up the Duo PAM module for SSH Jumphosts and the like 
 # See https://duo.com/docs/duounix for more info on the Duo setup
 #
 # Root check
 if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
 fi

 # Downloading required items
 curl -O https://dl.duosecurity.com/duo_unix-latest.tar.gz
 tar zxf duo_unix-latest.tar.gz
 rm duo_unix-latest.tar.gz
 cd duo_unix-*

 # Installing needed packages
 apt-get install gcc -y
 apt-get install libssl-dev libpam-dev -y
 ./configure --with-pam --prefix=/usr && make && sudo make install

 ## Setting SSH config
 # Important variables for pam_duo are
 # UsePAM yes
 # ChallengeResponseAuthentication yes
 # UseDNS no
 #
 # If you want to always force a Duo Push, you'll need to disable SSH key auth which bypasses:
 # Change the following to
 # PubkeyAuthentication no
 # PasswordAuthentication yes
 # AuthenticationMethods password
 #

 cat > /etc/ssh/sshd_config <<EOF
 #	$OpenBSD: sshd_config,v 1.100 2016/08/15 12:32:04 naddy Exp $

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

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

 # 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 2m
 #PermitRootLogin prohibit-password
 #StrictModes yes
 #MaxAuthTries 6
 #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)
 ChallengeResponseAuthentication yes

 # 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 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

 #AllowAgentForwarding yes
 #AllowTcpForwarding yes
 #GatewayPorts no
 X11Forwarding yes
 #X11DisplayOffset 10
 #X11UseLocalhost yes
 #PermitTTY yes
 PrintMotd no
 #PrintLastLog yes
 #TCPKeepAlive yes
 #UseLogin no
 #UsePrivilegeSeparation sandbox
 #PermitUserEnvironment no
 #Compression delayed
 #ClientAliveInterval 0
 #ClientAliveCountMax 3
 UseDNS no
 #PidFile /var/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
 EOF

 # Requring DUO push for SSHD PAM settings
 echo "auth required pam_duo.so" >> /etc/pam.d/sshd

 # Restarting SSH to make sure the config is picked up
 service ssh restart
	#!/bin/bash
	#
	#
	# Author: Benjamin Hering - [email protected]
	#
	#
	# Sets up the Duo PAM module for SSH Jumphosts and the like
	# See https://duo.com/docs/duounix for more info on the Duo setup
	#
	# Root check
	if [ "$EUID" -ne 0 ]
	then echo "Please run as root"
	exit
	fi

	# Downloading required items
	curl -O https://dl.duosecurity.com/duo_unix-latest.tar.gz
	tar zxf duo_unix-latest.tar.gz
	rm duo_unix-latest.tar.gz
	cd duo_unix-*

	# Installing needed packages
	apt-get install gcc -y
	apt-get install libssl-dev libpam-dev -y
	./configure --with-pam --prefix=/usr && make && sudo make install

	## Setting SSH config
	# Important variables for pam_duo are
	# UsePAM yes
	# ChallengeResponseAuthentication yes
	# UseDNS no
	#
	# If you want to always force a Duo Push, you'll need to disable SSH key auth which bypasses:
	# Change the following to
	# PubkeyAuthentication no
	# PasswordAuthentication yes
	# AuthenticationMethods password
	#

	cat > /etc/ssh/sshd_config <<EOF
	# $OpenBSD: sshd_config,v 1.100 2016/08/15 12:32:04 naddy Exp $

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

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

	# 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 2m
	#PermitRootLogin prohibit-password
	#StrictModes yes
	#MaxAuthTries 6
	#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)
	ChallengeResponseAuthentication yes

	# 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 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

	#AllowAgentForwarding yes
	#AllowTcpForwarding yes
	#GatewayPorts no
	X11Forwarding yes
	#X11DisplayOffset 10
	#X11UseLocalhost yes
	#PermitTTY yes
	PrintMotd no
	#PrintLastLog yes
	#TCPKeepAlive yes
	#UseLogin no
	#UsePrivilegeSeparation sandbox
	#PermitUserEnvironment no
	#Compression delayed
	#ClientAliveInterval 0
	#ClientAliveCountMax 3
	UseDNS no
	#PidFile /var/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
	EOF

	# Requring DUO push for SSHD PAM settings
	echo "auth required pam_duo.so" >> /etc/pam.d/sshd

	# Restarting SSH to make sure the config is picked up
	service ssh restart
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