Public bug reported:
Using libpam-script 1.1.9-1 from bionic/universe.
I've set up pam to use pam_script in common-session:
session optional pam_script.so dir=/etc/pam-script
And used the example pam-script file from /usr/share/doc/libpam-
script/examples/pam_script.gz
At the top of the file, it uses "#! /bin/sh". ("/bin/sh" links to
"/bin/dash"). When I attempt to test something with pamtester:
pamtester -v login root open_session
I get:
/etc/pam-script/pam_script_ses_open: 32: /etc/pam-
script/pam_script_ses_open: Bad substitution
Line 32 is:
world_write_bit=${stat_output:8:1}
bash supports the ${parameter:offset:length}, whilst dash does not.
Possible fix is to do something similar to determining the user/group
and:
world_write_bit=`echo $stat_output | /usr/bin/cut -c 9`
** Affects: libpam-script (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1777895
Title:
Example pam-script does not work with dash
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