'\" t
.TH "PAM_SYSTEMD_LOADKEY" "8" "" "systemd 256.7" "pam_systemd_loadkey"
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.SH "NAME"
pam_systemd_loadkey \- Read password from kernel keyring and set it as PAM authtok
.SH "SYNOPSIS"
.PP
pam_systemd_loadkey\&.so
.SH "DESCRIPTION"
.PP
\fBpam_systemd_loadkey\fR
reads a NUL\-separated password list from the kernel keyring, and sets the last password in the list as the PAM authtok\&.
.PP
The password list is supposed to be stored in the "user" keyring of the root user, by an earlier call to
\fBsystemd-ask-password\fR(1)
with
\fB\-\-keyname=\fR\&. You can pass the keyname to
\fBpam_systemd_loadkey\fR
via the
\fBkeyname=\fR
option\&.
.SH "OPTIONS"
.PP
The following options are understood:
.PP
\fIkeyname=\fR
.RS 4
Takes a string argument which sets the keyname to read\&. The default is
"cryptsetup"\&. During boot,
\fBsystemd-cryptsetup@.service\fR(8)
stores a passphrase or PIN in the keyring\&. The LUKS2 volume key can also be used, via the
\fBlink\-volume\-key\fR
option in
\fBcrypttab\fR(5)\&.
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.B Table\ \&1.\ \& Possible values for \fIkeyname\fR\&.
.TS
allbox tab(:);
lB lB.
T{
Value
T}:T{
Description
T}
.T&
l l
l l
l l
l l.
T{
cryptsetup
T}:T{
Passphrase or recovery key
T}
T{
fido2\-pin
T}:T{
Security token PIN
T}
T{
luks2\-pin
T}:T{
LUKS2 token PIN
T}
T{
tpm2\-pin
T}:T{
TPM2 PIN
T}
.TE
.sp 1
Added in version 255\&.
.RE
.PP
\fIdebug\fR
.RS 4
The module will log debugging information as it operates\&.
.sp
Added in version 255\&.
.RE
.SH "EXAMPLE"
.PP
This module is intended to be used when you use LUKS with a passphrase, enable autologin in the display manager, and want to unlock Gnome Keyring / KDE KWallet automatically\&. So in total, you only enter one password during boot\&.
.PP
You need to set the password of your Gnome Keyring/KWallet to the same as your LUKS passphrase\&. Then add the following lines to your display manager\*(Aqs PAM config under
/etc/pam\&.d/
(e\&.g\&.
sddm\-autologin):
.sp
.if n \{\
.RS 4
.\}
.nf
\-auth       optional    pam_systemd_loadkey\&.so
\-auth       optional    pam_gnome_keyring\&.so
\-session    optional    pam_gnome_keyring\&.so auto_start
\-session    optional    pam_kwallet5\&.so auto_start
    
.fi
.if n \{\
.RE
.\}
.PP
And add the following lines to your display manager\*(Aqs systemd service file, so it can access root\*(Aqs keyring:
.sp
.if n \{\
.RS 4
.\}
.nf
[Service]
KeyringMode=inherit
    
.fi
.if n \{\
.RE
.\}
.PP
In this setup, early during the boot process,
\fBsystemd-cryptsetup@.service\fR(8)
will ask for the passphrase and store it in the kernel keyring with the keyname
"cryptsetup"\&. Then when the display manager does the autologin, pam_systemd_loadkey will read the passphrase from the kernel keyring, set it as the PAM authtok, and then pam_gnome_keyring and pam_kwallet5 will unlock with the same passphrase\&.