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nixos/modules/security/pam: fix #95798 & #128116

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Previously, `pam_unix.so` was `required` to set PAM_AUTHTOK so that
dependent pam modules (such as gnome keyering) could use the password
(for example to unlock a keyring) upon login of the user. This however
broke any additional auth providers (such as AD or LDAP): for any
non-local user `pam_unix.so` will not yield success, thus eventually the
auth would fail (even the following auth providers were actually
executed, they could not overrule the already failed auth).

This change replaces `required` by `optional`. Therefore, the
`pam_unix.so` is executed and can set the PAM_AUTHTOK for the following
optional modules, _even_ if the user is not a local user. Therefore, the
gnome keyring for example is unlocked both for local and additional
users upon login, and login is working for non-local users via
LDAP/AD.
This commit is contained in:
Wanja Zaeske 2022-05-18 15:22:46 +02:00
parent 675f9f6e43
commit 305b633423
1 changed files with 2 additions and 2 deletions
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4
nixos/modules/security/pam.nix
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@ -503,7 +503,7 @@ let
# Modules in this block require having the password set in PAM_AUTHTOK.
# pam_unix is marked as 'sufficient' on NixOS which means nothing will run
# after it succeeds. Certain modules need to run after pam_unix
# prompts the user for password so we run it once with 'required' at an
# prompts the user for password so we run it once with 'optional' at an
# earlier point and it will run again with 'sufficient' further down.
# We use try_first_pass the second time to avoid prompting password twice
(optionalString (cfg.unixAuth &&
@ -516,7 +516,7 @@ let
|| cfg.duoSecurity.enable))
(
''
auth required pam_unix.so ${optionalString cfg.allowNullPassword "nullok"} ${optionalString cfg.nodelay "nodelay"} likeauth
auth optional pam_unix.so ${optionalString cfg.allowNullPassword "nullok"} ${optionalString cfg.nodelay "nodelay"} likeauth
'' +
optionalString config.security.pam.enableEcryptfs ''
auth optional ${pkgs.ecryptfs}/lib/security/pam_ecryptfs.so unwrap