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53 lines
2.8 KiB
Bash
Executable file
53 lines
2.8 KiB
Bash
Executable file
#!/bin/bash
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# SEE ALSO: /etc/xdg/lxsession/LXDE-pi/sshpwd-lxde-iiab.sh sourced from...
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# https://github.com/iiab/iiab/blob/master/roles/iiab-admin/templates/sshpwd-lxde-iiab.sh
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# ...invoked by /etc/xdg/lxsession/LXDE-pi/autostart which is customized by...
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# https://github.com/iiab/iiab/blob/master/roles/iiab-admin/tasks/main.yml#L32-L36
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# For Localization/Translation: (use /usr/bin/gettext below if later nec!)
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#export TEXTDOMAIN=Linux-PAM
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#. gettext.sh
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# https://github.com/raspberrypi-ui/pam/blob/master/etc/profile.d/sshpwd.sh
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# https://github.com/raspberrypi-ui/pprompt/blob/master/sshpwd.sh
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# bash syntax "function check_user_pwd() {" was removed, as it prevented all
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# lightdm/graphical logins (incl autologin) on Raspbian: #1252 -> PR #1253
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check_user_pwd() {
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#[ $(id -un) = "root" ] || return 2
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#[ $(id -un) = "root" ] || [ $(id -un) = "iiab-admin" ] || return 2
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[ -r /etc/shadow ] || return 2 # FORCE ERROR if /etc/shadow not readable
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# *BUT* overall bash script still returns exit code 0 ("success").
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#id -u $1 > /dev/null 2>&1 || return 2 # Not needed if return 1 is good
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# enough when user does not exist. Or uncomment to FORCE ERROR CODE 2.
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# Either way, overall bash script still returns exit code 0 ("success").
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# $meth (hashing method) is typically '6' which implies 5000 rounds
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# of SHA-512 per /etc/login.defs -> /etc/pam.d/common-password
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meth=$(grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f2)
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salt=$(grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f3)
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hash=$(grep "^$1:" /etc/shadow | cut -d: -f2 | cut -d$ -f4)
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[ $(python3 -c "import crypt; print(crypt.crypt('$2', '\$$meth\$$salt'))") == "\$$meth\$$salt\$$hash" ]
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}
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# 2020-10-13 https://github.com/iiab/iiab/issues/2561 RECAP: Above was blocking
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# logins, lacking permissions to grep /etc/shadow. As it's unreasonable to
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# provide sudo privs to every user (with "NOPASSWD:" password-free sudo access
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# or not, as required by graphical logins!)
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# MORE DETAILS: most logins (graphical or tty) blocked on above [sudo] grep
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# (at least tty logins finally let sudoers in, after entering password twice!)
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# EXCEPTION: ALL GRAPHICAL logins to Raspberry Pi OS still worked, no matter
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# whether sshpwd-lxde-iiab.sh's "sudo grep" displayed our popup warning or not!
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# HISTORICAL: if password-free sudo access is truly nec, it can be set with
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# "iiab-admin ALL=(ALL) NOPASSWD: ALL" in /etc/sudoers as seen in the older:
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# https://github.com/iiab/iiab/blob/master/roles/iiab-admin/tasks/admin-user.yml
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if check_user_pwd "{{ iiab_admin_user }}" "{{ iiab_admin_published_pwd }}" ; then # iiab-admin g0adm1n
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echo
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echo "Published password in use by user '{{ iiab_admin_user }}'."
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echo "THIS IS A SECURITY RISK - please run 'sudo passwd {{ iiab_admin_user }}' to change it."
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echo
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fi
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