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PAM_SYSTEMD(8) | pam_systemd | PAM_SYSTEMD(8) |
NAME¶
pam_systemd - Register user sessions in the systemd login managerSYNOPSIS¶
pam_systemd.soDESCRIPTION¶
pam_systemd registers user sessions in the systemd login manager systemd-logind.service(8), and hence the systemd control group hierarchy. On login, this module ensures the following: 1.If it does not exist yet, the user runtime
directory /run/user/$USER is created and its ownership changed to the user
that is logging in.
2.The $XDG_SESSION_ID environment
variable is initialized. If auditing is available and pam_loginuid.so
run before this module (which is highly recommended), the variable is
initialized from the auditing session id (/proc/self/sessionid). Otherwise an
independent session counter is used.
3.A new control group
/user/$USER/$XDG_SESSION_ID is created and the login process moved into
it.
On logout, this module ensures the following:
1.If $XDG_SESSION_ID is set and
kill-session-processes=1 specified, all remaining processes in the
/user/$USER/$XDG_SESSION_ID control group are killed and the control group is
removed.
2.If the last subgroup of the /user/$USER
control group was removed the $XDG_RUNTIME_DIR directory and all its
contents are removed, too.
If the system was not booted up with systemd as init system, this module does
nothing and immediately returns PAM_SUCCESS.
OPTIONS¶
The following options are understood: kill-session-processes=Takes a boolean argument. If true, all
processes created by the user during his session and from his session will be
terminated when he logs out from his session.
kill-only-users=
Takes a comma separated list of user names or
numeric user ids as argument. If this option is used the effect of the
kill-session-processes= options will apply only to the listed users. If
this option is not used the option applies to all local users. Note that
kill-exclude-users= takes precedence over this list and is hence
subtracted from the list specified here.
kill-exclude-users=
Takes a comma separated list of user names or
numeric user ids as argument. Users listed in this argument will not be
subject to the effect of kill-session-processes=. Note that this option
takes precedence over kill-only-users=, and hence whatever is listed
for kill-exclude-users= is guaranteed to never be killed by this PAM
module, independent of any other configuration setting.
controllers=
Takes a comma separated list of control group
controllers in which hierarchies a user/session control group will be created
by default for each user logging in, in addition to the control group in the
named 'name=systemd' hierarchy. If omitted, defaults to an empty list.
reset-controllers=
Takes a comma separated list of control group
controllers in which hierarchies the logged in processes will be reset to the
root control group.
class=
Takes a string argument which sets the session
class. The XDG_SESSION_CLASS environmental variable takes precedence.
debug=
Takes a boolean argument. If yes, the module
will log debugging information as it operates.
Note that setting kill-session-processes=1 will break tools like
screen(1).
Note that kill-session-processes=1 is a stricter version of
KillUserProcesses=1 which may be configured system-wide in
logind.conf(5). The former kills processes of a session as soon as it
ends, the latter kills processes as soon as the last session of the user ends.
If the options are omitted they default to kill-session-processes=0,
kill-only-users=, kill-exclude-users=, controllers=,
reset-controllers=, debug=no.
MODULE TYPES PROVIDED¶
Only session is provided.ENVIRONMENT¶
The following environment variables are set for the processes of the user's session: $XDG_SESSION_IDA session identifier, suitable to be used in
file names. The string itself should be considered opaque, although often it
is just the audit session ID as reported by /proc/self/sessionid. Each ID will
be assigned only once during machine uptime. It may hence be used to uniquely
label files or other resources of this session.
$XDG_RUNTIME_DIR
Path to a user-private user-writable directory
that is bound to the user login time on the machine. It is automatically
created the first time a user logs in and removed on his final logout. If a
user logs in twice at the same time, both sessions will see the same
$XDG_RUNTIME_DIR and the same contents. If a user logs in once, then
logs out again, and logs in again, the directory contents will have been lost
in between, but applications should not rely on this behavior and must be able
to deal with stale files. To store session-private data in this directory the
user should include the value of $XDG_SESSION_ID in the filename. This
directory shall be used for runtime file system objects such as AF_UNIX
sockets, FIFOs, PID files and similar. It is guaranteed that this directory is
local and offers the greatest possible file system feature set the operating
system provides.
EXAMPLE¶
#%PAM-1.0 auth required pam_unix.so auth required pam_nologin.so account required pam_unix.so password required pam_unix.so session required pam_unix.so session required pam_loginuid.so session required pam_systemd.so kill-session-processes=1
SEE ALSO¶
systemd 204 |