зарегистрируйте пользовательские сеансы в диспетчере входа в систему (Register user sessions in the systemd login manager)
Имя (Name)
pam_systemd - Register user sessions in the systemd login manager
Синопсис (Synopsis)
pam_systemd.so
Описание (Description)
pam_systemd registers user sessions with the systemd login
manager systemd-logind.service(8), and hence the systemd control
group hierarchy.
The module also applies various resource management and runtime
parameters to the new session, as configured in the JSON User
Records
On login, this module — in conjunction with
systemd-logind.service — ensures the following:
1. If it does not exist yet, the user runtime directory
/run/user/$UID is either created or mounted as new "tmpfs"
file system with quota applied, and its ownership changed to
the user that is logging in.
2. The $XDG_SESSION_ID environment variable is initialized. If
auditing is available and pam_loginuid.so was run before this
module (which is highly recommended), the variable is
initialized from the auditing session id
(/proc/self/sessionid). Otherwise, an independent session
counter is used.
3. A new systemd scope unit is created for the session. If this
is the first concurrent session of the user, an implicit
per-user slice unit below user.slice is automatically created
and the scope placed into it. An instance of the system
service user@.service, which runs the systemd user manager
instance, is started.
4. The "$TZ", "$EMAIL" and "$LANG" environment variables are
configured for the user, based on the respective data from
the user's JSON record (if it is defined). Moreover, any
environment variables explicitly configured in the user
record are imported, and the umask, nice level, and resource
limits initialized.
On logout, this module ensures the following:
1. If enabled in logind.conf(5) (KillUserProcesses=), all
processes of the session are terminated. If the last
concurrent session of a user ends, the user's systemd
instance will be terminated too, and so will the user's slice
unit.
2. If the last concurrent session of a user ends, the user
runtime directory /run/user/$UID 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.
Параметры (Options)
The following options are understood:
class=
Takes a string argument which sets the session class. The
XDG_SESSION_CLASS environment variable (see below) takes
precedence. One of "user", "greeter", "lock-screen" or
"background". See sd_session_get_class(3) for details about
the session class.
type=
Takes a string argument which sets the session type. The
XDG_SESSION_TYPE environment variable (see below) takes
precedence. One of "unspecified", "tty", "x11", "wayland" or
"mir". See sd_session_get_type(3) for details about the
session type.
desktop=
Takes a single, short identifier string for the desktop
environment. The XDG_SESSION_DESKTOP environment variable
(see below) takes precedence. This may be used to indicate
the session desktop used, where this applies and if this
information is available. For example: "GNOME", or "KDE". It
is recommended to use the same identifiers and capitalization
as for $XDG_CURRENT_DESKTOP, as defined by the Desktop Entry
Specification
debug[=]
Takes an optional boolean argument. If yes or without the
argument, the module will log debugging information as it
operates.
Предоставляемые типы модулей (Module types provided)
Only session is provided.
Окружение (Environment)
The following environment variables are initialized by the module
and available to the processes of the user's session:
$XDG_SESSION_ID
A short session identifier, suitable to be used in filenames.
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. Combine this ID
with the boot identifier, as returned by
sd_id128_get_boot(3), for a globally unique identifier.
$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 the
user's 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. For further details, see the XDG Base
Directory Specification
$TZ, $EMAIL, $LANG
If a JSON user record is known for the user logging in these
variables are initialized from the respective data in the
record.
The following environment variables are read by the module and
may be used by the PAM service to pass metadata to the module. If
these variables are not set when the PAM module is invoked but
can be determined otherwise they are set by the module, so that
these variables are initialized for the session and applications
if known at all.
$XDG_SESSION_TYPE
The session type. This may be used instead of type= on the
module parameter line, and is usually preferred.
$XDG_SESSION_CLASS
The session class. This may be used instead of class= on the
module parameter line, and is usually preferred.
$XDG_SESSION_DESKTOP
The desktop identifier. This may be used instead of desktop=
on the module parameter line, and is usually preferred.
$XDG_SEAT
The seat name the session shall be registered for, if any.
$XDG_VTNR
The VT number the session shall be registered for, if any.
(Only applies to seats with a VT available, such as "seat0")
If not set, pam_systemd will initialize $XDG_SEAT and $XDG_VTNR
based on the $DISPLAY variable (if the latter is set).
SESSION LIMITS
PAM modules earlier in the stack, that is those that come before
pam_systemd.so, can set session scope limits using the PAM
context objects. The data for these objects is provided as
NUL-terminated C strings and maps directly to the respective unit
resource control directives. Note that these limits apply to
individual sessions of the user, they do not apply to all user
processes as a combined whole. In particular, the per-user
user@.service unit instance, which runs the systemd --user
manager process and its children, and is tracked outside of any
session, being shared by all the user's sessions, is not covered
by these limits.
See systemd.resource-control(5) for more information about the
resources. Also, see pam_set_data(3) for additional information
about how to set the context objects.
systemd.memory_max=
Sets unit MemoryMax=.
systemd.tasks_max=
Sets unit TasksMax=.
systemd.cpu_weight=
Sets unit CPUWeight=.
systemd.io_weight=
Sets unit IOWeight=.
systemd.runtime_max_sec=
Sets unit RuntimeMaxSec=.
Example data as can be provided from an another PAM module:
pam_set_data(handle, "systemd.memory_max", (void *)"200M", cleanup);
pam_set_data(handle, "systemd.tasks_max", (void *)"50", cleanup);
pam_set_data(handle, "systemd.cpu_weight", (void *)"100", cleanup);
pam_set_data(handle, "systemd.io_weight", (void *)"340", cleanup);
pam_set_data(handle, "systemd.runtime_max_sec", (void *)"3600", cleanup);
Примеры (Examples)
Here's an example PAM configuration fragment that allows users
sessions to be managed by systemd-logind.service:
#%PAM-1.0
auth sufficient pam_unix.so
-auth sufficient pam_systemd_home.so
auth required pam_deny.so
account required pam_nologin.so
-account sufficient pam_systemd_home.so
account sufficient pam_unix.so
account required pam_permit.so
-password sufficient pam_systemd_home.so
password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok
password required pam_deny.so
-session optional pam_keyinit.so revoke
-session optional pam_loginuid.so
-session optional pam_systemd_home.so
-session optional pam_systemd.so
session required pam_unix.so
Смотри также (See also)
systemd(1), systemd-logind.service(8), logind.conf(5),
loginctl(1), pam_systemd_home(8), pam.conf(5), pam.d(5), pam(8),
pam_loginuid(8), systemd.scope(5), systemd.slice(5),
systemd.service(5)
Примечание (Note)
1. JSON User Records
https://systemd.io/USER_RECORD
2. Desktop Entry Specification
http://standards.freedesktop.org/desktop-entry-spec/latest/
3. XDG Base Directory Specification
http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
