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Description of problem:
When a python script is present in "/usr/sbin", it takes precedence over regular modules. This breaks "semanage", for example when a "/usr/sbin/audit.py" script is present, e.g.:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
# cat /usr/sbin/audit.py
import sys
print("BAD GUY!", file=sys.stderr)
sys.exit(1)
# semanage boolean -l
BAD GUY!
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
This is very problematic because it's difficult to troubleshoot: python applications usually read a lot of modules from many places. Finding the culprit requires in-depth analysis using strace or similar tools.
The root cause for this seems to having PYTHONPATH specify "/usr/sbin" when executing "semanage":
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
# tail /usr/sbin/semanage
[...]
if __name__ == '__main__':
print(sys.path)
do_parser()
# semanage boolean -l
['/usr/sbin', '/usr/lib64/python36.zip', '/usr/lib64/python3.6', '/usr/lib64/python3.6/lib-dynload', '/usr/lib64/python3.6/site-packages', '/usr/lib/python3.6/site-packages']
BAD GUY!
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
The root cause for this is only using "-Es" options in the shebang:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
# head -1 /usr/sbin/semanage
#! /usr/libexec/platform-python -Es
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
The tools needs to add "-I" as well:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
# head -1 /usr/sbin/semanage
#! /usr/libexec/platform-python -EsI
# semanage boolean -l
['/usr/lib64/python36.zip', '/usr/lib64/python3.6', '/usr/lib64/python3.6/lib-dynload', '/usr/lib64/python3.6/site-packages', '/usr/lib/python3.6/site-packages']
SELinux boolean State Default Description
...
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
Version-Release number of selected component (if applicable):
policycoreutils-python-utils-2.9-19.el8.noarch
How reproducible:
Always
Steps to Reproduce: see above
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 (policycoreutils bug fix and enhancement update), 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-2023:3034
Description of problem: When a python script is present in "/usr/sbin", it takes precedence over regular modules. This breaks "semanage", for example when a "/usr/sbin/audit.py" script is present, e.g.: -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- # cat /usr/sbin/audit.py import sys print("BAD GUY!", file=sys.stderr) sys.exit(1) # semanage boolean -l BAD GUY! -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- This is very problematic because it's difficult to troubleshoot: python applications usually read a lot of modules from many places. Finding the culprit requires in-depth analysis using strace or similar tools. The root cause for this seems to having PYTHONPATH specify "/usr/sbin" when executing "semanage": -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- # tail /usr/sbin/semanage [...] if __name__ == '__main__': print(sys.path) do_parser() # semanage boolean -l ['/usr/sbin', '/usr/lib64/python36.zip', '/usr/lib64/python3.6', '/usr/lib64/python3.6/lib-dynload', '/usr/lib64/python3.6/site-packages', '/usr/lib/python3.6/site-packages'] BAD GUY! -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- The root cause for this is only using "-Es" options in the shebang: -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- # head -1 /usr/sbin/semanage #! /usr/libexec/platform-python -Es -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- The tools needs to add "-I" as well: -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- # head -1 /usr/sbin/semanage #! /usr/libexec/platform-python -EsI # semanage boolean -l ['/usr/lib64/python36.zip', '/usr/lib64/python3.6', '/usr/lib64/python3.6/lib-dynload', '/usr/lib64/python3.6/site-packages', '/usr/lib/python3.6/site-packages'] SELinux boolean State Default Description ... -------- 8< ---------------- 8< ---------------- 8< ---------------- 8< -------- Version-Release number of selected component (if applicable): policycoreutils-python-utils-2.9-19.el8.noarch How reproducible: Always Steps to Reproduce: see above