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Description of problem:
Due to being one of the few pam stacks that uses pam_rootok.so, /etc/pam.d/su bypasses pam_env when run as root. pam_env is in system-auth as the first entry which is not reached.
This causes variables set in /etc/environment to not be set.
A potential work around would be to either remove 'auth sufficient pam_rootok.so' or to add 'session required pam_env.so'
/etc/pam.d/su
#%PAM-1.0
auth sufficient pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth sufficient pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
#auth required pam_wheel.so use_uid
auth substack system-auth
auth include postlogin
account sufficient pam_succeed_if.so uid = 0 use_uid quiet
account include system-auth
password include system-auth
session include system-auth
session include postlogin
session optional pam_xauth.so
/etc/pam.d/system-auth
#%PAM-1.0
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
auth required pam_env.so
auth sufficient pam_fprintd.so
auth sufficient pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 1000 quiet_success
auth required pam_deny.so
account required pam_unix.so
account sufficient pam_localuser.so
account sufficient pam_succeed_if.so uid < 1000 quiet
account required pam_permit.so
password requisite pam_pwquality.so try_first_pass local_users_only retry=3 authtok_type=
password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password required pam_deny.so
session optional pam_keyinit.so revoke
session required pam_limits.so
-session optional pam_systemd.so
session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session required pam_unix.so
Version-Release number of selected component (if applicable):
util-linux-2.23.2-59.el7_6.1.x86_64
How reproducible:
Every time as root
Steps to Reproduce:
1. Set a variable in /etc/environment
2. su as root user
3. note the variables are not set
Actual results:
/etc/environment variables are not set since pam_env is never reached.
Expected results:
/etc/environment variables should be set.
I have doubts that RHEL-7 update is the right place for the change. You can solve the problem locally for example by "session required pam_env.so"
For RHEL it will be better do the change in RHEL-8.1 and Fedora. CC: Tomas (PAM maintainer)
The first possibility is to add pam_env to the session, or another way is to add pam_env to auth before pam_rootok. It seems safe to call
pam_env more than once and more easy than try to be smart with pam_succeed_if.so :-)
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2019:3603