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factory: tighten PAM configuration

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Apparently PAM reacts differently on different systems (?) and if no
authoritative matching module is found might either succeed/fail,
depending on the system.

Let's lock this down explicitly, by hooking in pam_deny.so.

Of course, these PAM files are just examples, and no distro in its right
mind would ship these unmodified, but let's default to something safe.

Fixes: #12950
This commit is contained in:
Lennart Poettering 2019-07-12 12:17:12 +02:00
parent b65011dad0
commit ed40cb82f7
1 changed files with 3 additions and 0 deletions
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3
factory/etc/pam.d/system-auth
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@ -1,11 +1,14 @@
# This file is part of systemd.
auth sufficient pam_unix.so nullok try_first_pass
auth required pam_deny.so
account required pam_nologin.so
account sufficient pam_unix.so
account required pam_permit.so
password sufficient pam_unix.so nullok sha512 shadow try_first_pass try_authtok
password required pam_deny.so
-session optional pam_loginuid.so
-session optional pam_systemd.so