[Bug 955032] Re: pam environment duplicate path directories since it is called without user_readenv=0
axeoth
955032 at bugs.launchpad.net
Thu Mar 15 10:00:22 UTC 2012
Sorry, I was not very explicit about the underlying cause. It appears on
the link that I gave (http://superuser.com/questions/135730/why-do-i
-get-duplicated-entries-in-my-path), namely in the post (and the answer)
gave by Nick Taylor:
"The problem seems to stem from the fact that pam_env defaults to
reading the user ~/.pam_environment every time it is invoked. A lot of
login methods (cron, lightdm, lightdm-autologin, login, sshd and su on
my machine) invoke pam_env twice: once to read the /etc/environment and
~/.pam_environment files, and once to read the /etc/default/locale file.
In neither case is the user_readenv flag set, so pam_env reads, and acts
on, your ~/.pam_environment twice."
Thank you for taking this issue into consideration. I was wondering if
the parameter "user_readenv=0" could not be put directly into the
/etc/default/locale file.
Anyway, thanks again.
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https://bugs.launchpad.net/bugs/955032
Title:
pam environment duplicate path directories since it is called without
user_readenv=0
Status in “pam” package in Ubuntu:
Triaged
Bug description:
I am trying to set my Environment variables through the procedure
described in: https://help.ubuntu.com/community/EnvironmentVariables
(BTW, that page states that ~/.pam_environment: "It is not a script
file, but rather consists of assignment expressions, one per line.",
which is misleading since it allows one believe that the syntax is the
same as of /etc/environment file, which is not tru. ~/.pam_environment
uses the pam_env.conf syntax, as specified here:
http://manpages.ubuntu.com/manpages/natty/man5/pam_env.conf.5.html)
However, back to the bug: basically, I added (prepended) some
directory to the ${PATH} variable inside my .pam_environment file and
that folder was duplicated in the final PATH variable.
The reason is that (see also: http://superuser.com/questions/135730
/why-do-i-get-duplicated-entries-in-my-path) the user_readenv=0
parameter is not specified in the lines where pam_env.so is called
inside *all* the files in /etc/pam.d
Basically, after creating my .pam_environment file, I had to go inside
/etc/pam.d and to scan all files and to add the "user_readenv=0"
parameter to every line where "pam_env.so envfile=/etc/default/locale"
was encountered.
For example, in "cron" file, I had to change:
session required pam_env.so envfile=/etc/default/locale
into:
session required pam_env.so envfile=/etc/default/locale
user_readenv=0
and this goes the same for all other files inside /etc/pam.d/ folder
that contain the line "pam_env.so envfile=/etc/default/locale"
That's annoying. Please update those files to contain, by default,
"user_readenv=0", to avoid duplicate folders when setting $PATH
through the .pam_environment file.
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