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Code Issues Releases Wiki Activity

sshpwd-profile-iiab.sh blocked graphical logins

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A Holt 2020-10-09 06:40:39 -04:00 • committed by GitHub
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roles/iiab-admin/templates/sshpwd-profile-iiab.sh
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@ -1,31 +1,43 @@
#!/bin/bash
export TEXTDOMAIN=Linux-PAM
# SEE ALSO: /etc/xdg/lxsession/LXDE-pi/sshpwd-lxde-iiab.sh sourced from...
# https://github.com/iiab/iiab/blob/master/roles/iiab-admin/templates/sshpwd-lxde-iiab.sh
# ...invoked by customized /etc/xdg/lxsession/LXDE-pi/autostart
. gettext.sh
# For Localisation:
#export TEXTDOMAIN=Linux-PAM
#. gettext.sh
# https://github.com/raspberrypi-ui/pam/blob/master/etc/profile.d/sshpwd.sh
# https://github.com/raspberrypi-ui/pprompt/blob/master/sshpwd.sh
# bash syntax "function check_user_pwd() {" was removed, as it prevented all
# lightdm/graphical logins (incl autologin) on Raspbian: #1252 -> PR #1253
check_user_pwd() {
# 1. 'sudo su -' invokes this script as root:
[ $(id -un) = "root" ] || return 1 # FORCE ERROR IF RUN BY NON-root
# *BUT* overall bash script still returns exit code 0 ("success")
# as needed by Ubuntu 20.04 graphical logins, etc!
# 2. Graphical Logins invoke this script as the user logging in: (USELESSLY)
#[ $(id -un) = "$1" ] || [ $(id -un) = "root" ] || return 1
# SO FORMERLY: this could also be run by non-root accounts e.g. iiab-admin
# if sudo access set with "%wheel ALL= NOPASSWD: ALL" in /etc/sudoers per
# https://github.com/iiab/iiab/blob/master/roles/iiab-admin/tasks/admin-user.yml
# BUT: warning popups did not result on most OS's, much as mentioned here:
# https://github.com/iiab/iiab/blob/master/roles/iiab-admin/tasks/main.yml#L38-L44
# $meth (hashing method) is typically '6' which implies 5000 rounds
# of SHA-512 per /etc/login.defs -> /etc/pam.d/common-password
meth=$(sudo grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f2)
salt=$(sudo grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f3)
hash=$(sudo grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f4)
meth=$(grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f2)
salt=$(grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f3)
hash=$(grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f4)
[ $(python3 -c "import crypt; print(crypt.crypt('$2', '\$$meth\$$salt'))") == "\$$meth\$$salt\$$hash" ]
}
# Credit to the folks at the Raspberry Pi Foundation
check_hash() {
if ! id -u iiab-admin > /dev/null 2>&1 ; then return 0 ; fi
if grep -q "^PasswordAuthentication\s*no" /etc/ssh/sshd_config ; then return 0 ; fi
if check_user_pwd "iiab-admin" "{{ iiab_admin_published_pwd }}"; then
echo
echo $(/usr/bin/gettext "SSH is enabled and the published password for user 'iiab-admin' is in use.")
echo $(/usr/bin/gettext "THIS IS A SECURITY RISK - please run 'sudo passwd iiab-admin' to change it.")
echo
fi
}
systemctl is-active {{ sshd_service }} > /dev/null && check_hash
unset check_hash
if check_user_pwd "iiab-admin" "g0adm1n"; then
echo
echo $(/usr/bin/gettext "The published password for user 'iiab-admin' is in use.")
echo $(/usr/bin/gettext "THIS IS A SECURITY RISK - please run 'sudo passwd iiab-admin' to change it.")
echo
fi