769 lines
22 KiB
C
769 lines
22 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
||
/***
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||
This file is part of systemd.
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||
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||
Copyright 2011 Lennart Poettering
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***/
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#include <errno.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <unistd.h>
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#include <stdio_ext.h>
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#include "alloc-util.h"
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#include "bus-common-errors.h"
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#include "bus-error.h"
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#include "bus-util.h"
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||
#include "cgroup-util.h"
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#include "clean-ipc.h"
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#include "conf-parser.h"
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#include "escape.h"
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||
#include "fd-util.h"
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#include "fileio.h"
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||
#include "format-util.h"
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#include "fs-util.h"
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#include "hashmap.h"
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||
#include "label.h"
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#include "logind-user.h"
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#include "mkdir.h"
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#include "mount-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "rm-rf.h"
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#include "smack-util.h"
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#include "special.h"
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#include "stdio-util.h"
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#include "string-table.h"
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#include "unit-name.h"
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#include "user-util.h"
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#include "util.h"
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int user_new(User **out, Manager *m, uid_t uid, gid_t gid, const char *name) {
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_cleanup_(user_freep) User *u = NULL;
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char lu[DECIMAL_STR_MAX(uid_t) + 1];
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int r;
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assert(out);
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assert(m);
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assert(name);
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u = new0(User, 1);
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if (!u)
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return -ENOMEM;
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u->manager = m;
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||
u->uid = uid;
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u->gid = gid;
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||
xsprintf(lu, UID_FMT, uid);
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||
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||
u->name = strdup(name);
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if (!u->name)
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return -ENOMEM;
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||
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if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0)
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return -ENOMEM;
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||
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if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0)
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return -ENOMEM;
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r = slice_build_subslice(SPECIAL_USER_SLICE, lu, &u->slice);
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if (r < 0)
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return r;
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r = unit_name_build("user", lu, ".service", &u->service);
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if (r < 0)
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return r;
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r = hashmap_put(m->users, UID_TO_PTR(uid), u);
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if (r < 0)
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return r;
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r = hashmap_put(m->user_units, u->slice, u);
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if (r < 0)
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return r;
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r = hashmap_put(m->user_units, u->service, u);
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if (r < 0)
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return r;
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*out = TAKE_PTR(u);
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return 0;
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}
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User *user_free(User *u) {
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if (!u)
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return NULL;
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if (u->in_gc_queue)
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LIST_REMOVE(gc_queue, u->manager->user_gc_queue, u);
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while (u->sessions)
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session_free(u->sessions);
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if (u->service)
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hashmap_remove_value(u->manager->user_units, u->service, u);
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if (u->slice)
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hashmap_remove_value(u->manager->user_units, u->slice, u);
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hashmap_remove_value(u->manager->users, UID_TO_PTR(u->uid), u);
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u->slice_job = mfree(u->slice_job);
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u->service_job = mfree(u->service_job);
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u->service = mfree(u->service);
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u->slice = mfree(u->slice);
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u->runtime_path = mfree(u->runtime_path);
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u->state_file = mfree(u->state_file);
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u->name = mfree(u->name);
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return mfree(u);
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}
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static int user_save_internal(User *u) {
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_cleanup_free_ char *temp_path = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(u);
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assert(u->state_file);
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r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0, MKDIR_WARN_MODE);
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if (r < 0)
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goto fail;
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r = fopen_temporary(u->state_file, &f, &temp_path);
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if (r < 0)
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goto fail;
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(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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"# This is private data. Do not parse.\n"
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"NAME=%s\n"
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"STATE=%s\n",
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u->name,
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user_state_to_string(user_get_state(u)));
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/* LEGACY: no-one reads RUNTIME= anymore, drop it at some point */
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if (u->runtime_path)
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fprintf(f, "RUNTIME=%s\n", u->runtime_path);
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if (u->service_job)
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fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
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if (u->slice_job)
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fprintf(f, "SLICE_JOB=%s\n", u->slice_job);
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if (u->display)
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fprintf(f, "DISPLAY=%s\n", u->display->id);
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if (dual_timestamp_is_set(&u->timestamp))
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fprintf(f,
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"REALTIME="USEC_FMT"\n"
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"MONOTONIC="USEC_FMT"\n",
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u->timestamp.realtime,
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u->timestamp.monotonic);
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if (u->sessions) {
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Session *i;
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bool first;
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fputs("SESSIONS=", f);
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first = true;
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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if (first)
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first = false;
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else
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fputc(' ', f);
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fputs(i->id, f);
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}
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fputs("\nSEATS=", f);
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first = true;
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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if (!i->seat)
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continue;
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if (first)
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first = false;
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else
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fputc(' ', f);
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fputs(i->seat->id, f);
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}
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fputs("\nACTIVE_SESSIONS=", f);
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first = true;
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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if (!session_is_active(i))
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continue;
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if (first)
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first = false;
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else
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fputc(' ', f);
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fputs(i->id, f);
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}
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fputs("\nONLINE_SESSIONS=", f);
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first = true;
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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if (session_get_state(i) == SESSION_CLOSING)
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continue;
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if (first)
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first = false;
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else
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fputc(' ', f);
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fputs(i->id, f);
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}
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fputs("\nACTIVE_SEATS=", f);
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first = true;
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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if (!session_is_active(i) || !i->seat)
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continue;
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if (first)
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first = false;
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else
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fputc(' ', f);
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fputs(i->seat->id, f);
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}
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fputs("\nONLINE_SEATS=", f);
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first = true;
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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if (session_get_state(i) == SESSION_CLOSING || !i->seat)
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continue;
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if (first)
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first = false;
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else
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fputc(' ', f);
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fputs(i->seat->id, f);
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}
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fputc('\n', f);
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}
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r = fflush_and_check(f);
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if (r < 0)
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goto fail;
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if (rename(temp_path, u->state_file) < 0) {
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r = -errno;
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goto fail;
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}
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return 0;
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fail:
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(void) unlink(u->state_file);
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if (temp_path)
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(void) unlink(temp_path);
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return log_error_errno(r, "Failed to save user data %s: %m", u->state_file);
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}
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int user_save(User *u) {
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assert(u);
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if (!u->started)
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return 0;
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return user_save_internal (u);
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}
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int user_load(User *u) {
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_cleanup_free_ char *display = NULL, *realtime = NULL, *monotonic = NULL;
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Session *s = NULL;
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int r;
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assert(u);
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r = parse_env_file(u->state_file, NEWLINE,
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"SERVICE_JOB", &u->service_job,
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"SLICE_JOB", &u->slice_job,
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"DISPLAY", &display,
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"REALTIME", &realtime,
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"MONOTONIC", &monotonic,
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NULL);
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if (r < 0) {
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if (r == -ENOENT)
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return 0;
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return log_error_errno(r, "Failed to read %s: %m", u->state_file);
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}
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if (display)
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s = hashmap_get(u->manager->sessions, display);
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if (s && s->display && display_is_local(s->display))
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u->display = s;
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if (realtime)
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timestamp_deserialize(realtime, &u->timestamp.realtime);
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if (monotonic)
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timestamp_deserialize(monotonic, &u->timestamp.monotonic);
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return r;
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}
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static int user_start_service(User *u) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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char *job;
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int r;
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assert(u);
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u->service_job = mfree(u->service_job);
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r = manager_start_unit(
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u->manager,
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u->service,
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&error,
|
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&job);
|
||
if (r < 0)
|
||
/* we don't fail due to this, let's try to continue */
|
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log_error_errno(r, "Failed to start user service, ignoring: %s", bus_error_message(&error, r));
|
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else
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u->service_job = job;
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|
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return 0;
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}
|
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int user_start(User *u) {
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int r;
|
||
|
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assert(u);
|
||
|
||
if (u->started && !u->stopping)
|
||
return 0;
|
||
|
||
/*
|
||
* If u->stopping is set, the user is marked for removal and the slice
|
||
* and service stop-jobs are queued. We have to clear that flag before
|
||
* queing the start-jobs again. If they succeed, the user object can be
|
||
* re-used just fine (pid1 takes care of job-ordering and proper
|
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* restart), but if they fail, we want to force another user_stop() so
|
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* possibly pending units are stopped.
|
||
* Note that we don't clear u->started, as we have no clue what state
|
||
* the user is in on failure here. Hence, we pretend the user is
|
||
* running so it will be properly taken down by GC. However, we clearly
|
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* return an error from user_start() in that case, so no further
|
||
* reference to the user is taken.
|
||
*/
|
||
u->stopping = false;
|
||
|
||
if (!u->started)
|
||
log_debug("Starting services for new user %s.", u->name);
|
||
|
||
/* Save the user data so far, because pam_systemd will read the
|
||
* XDG_RUNTIME_DIR out of it while starting up systemd --user.
|
||
* We need to do user_save_internal() because we have not
|
||
* "officially" started yet. */
|
||
user_save_internal(u);
|
||
|
||
/* Spawn user systemd */
|
||
r = user_start_service(u);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (!u->started) {
|
||
if (!dual_timestamp_is_set(&u->timestamp))
|
||
dual_timestamp_get(&u->timestamp);
|
||
user_send_signal(u, true);
|
||
u->started = true;
|
||
}
|
||
|
||
/* Save new user data */
|
||
user_save(u);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int user_stop_slice(User *u) {
|
||
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
||
char *job;
|
||
int r;
|
||
|
||
assert(u);
|
||
|
||
r = manager_stop_unit(u->manager, u->slice, &error, &job);
|
||
if (r < 0) {
|
||
log_error("Failed to stop user slice: %s", bus_error_message(&error, r));
|
||
return r;
|
||
}
|
||
|
||
free(u->slice_job);
|
||
u->slice_job = job;
|
||
|
||
return r;
|
||
}
|
||
|
||
static int user_stop_service(User *u) {
|
||
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
||
char *job;
|
||
int r;
|
||
|
||
assert(u);
|
||
|
||
r = manager_stop_unit(u->manager, u->service, &error, &job);
|
||
if (r < 0) {
|
||
log_error("Failed to stop user service: %s", bus_error_message(&error, r));
|
||
return r;
|
||
}
|
||
|
||
free_and_replace(u->service_job, job);
|
||
return r;
|
||
}
|
||
|
||
int user_stop(User *u, bool force) {
|
||
Session *s;
|
||
int r = 0, k;
|
||
assert(u);
|
||
|
||
/* Stop jobs have already been queued */
|
||
if (u->stopping) {
|
||
user_save(u);
|
||
return r;
|
||
}
|
||
|
||
LIST_FOREACH(sessions_by_user, s, u->sessions) {
|
||
k = session_stop(s, force);
|
||
if (k < 0)
|
||
r = k;
|
||
}
|
||
|
||
/* Kill systemd */
|
||
k = user_stop_service(u);
|
||
if (k < 0)
|
||
r = k;
|
||
|
||
/* Kill cgroup */
|
||
k = user_stop_slice(u);
|
||
if (k < 0)
|
||
r = k;
|
||
|
||
u->stopping = true;
|
||
|
||
user_save(u);
|
||
|
||
return r;
|
||
}
|
||
|
||
int user_finalize(User *u) {
|
||
Session *s;
|
||
int r = 0, k;
|
||
|
||
assert(u);
|
||
|
||
if (u->started)
|
||
log_debug("User %s logged out.", u->name);
|
||
|
||
LIST_FOREACH(sessions_by_user, s, u->sessions) {
|
||
k = session_finalize(s);
|
||
if (k < 0)
|
||
r = k;
|
||
}
|
||
|
||
/* Clean SysV + POSIX IPC objects, but only if this is not a system user. Background: in many setups cronjobs
|
||
* are run in full PAM and thus logind sessions, even if the code run doesn't belong to actual users but to
|
||
* system components. Since enable RemoveIPC= globally for all users, we need to be a bit careful with such
|
||
* cases, as we shouldn't accidentally remove a system service's IPC objects while it is running, just because
|
||
* a cronjob running as the same user just finished. Hence: exclude system users generally from IPC clean-up,
|
||
* and do it only for normal users. */
|
||
if (u->manager->remove_ipc && !uid_is_system(u->uid)) {
|
||
k = clean_ipc_by_uid(u->uid);
|
||
if (k < 0)
|
||
r = k;
|
||
}
|
||
|
||
unlink(u->state_file);
|
||
user_add_to_gc_queue(u);
|
||
|
||
if (u->started) {
|
||
user_send_signal(u, false);
|
||
u->started = false;
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
int user_get_idle_hint(User *u, dual_timestamp *t) {
|
||
Session *s;
|
||
bool idle_hint = true;
|
||
dual_timestamp ts = DUAL_TIMESTAMP_NULL;
|
||
|
||
assert(u);
|
||
|
||
LIST_FOREACH(sessions_by_user, s, u->sessions) {
|
||
dual_timestamp k;
|
||
int ih;
|
||
|
||
ih = session_get_idle_hint(s, &k);
|
||
if (ih < 0)
|
||
return ih;
|
||
|
||
if (!ih) {
|
||
if (!idle_hint) {
|
||
if (k.monotonic < ts.monotonic)
|
||
ts = k;
|
||
} else {
|
||
idle_hint = false;
|
||
ts = k;
|
||
}
|
||
} else if (idle_hint) {
|
||
|
||
if (k.monotonic > ts.monotonic)
|
||
ts = k;
|
||
}
|
||
}
|
||
|
||
if (t)
|
||
*t = ts;
|
||
|
||
return idle_hint;
|
||
}
|
||
|
||
int user_check_linger_file(User *u) {
|
||
_cleanup_free_ char *cc = NULL;
|
||
char *p = NULL;
|
||
|
||
cc = cescape(u->name);
|
||
if (!cc)
|
||
return -ENOMEM;
|
||
|
||
p = strjoina("/var/lib/systemd/linger/", cc);
|
||
|
||
return access(p, F_OK) >= 0;
|
||
}
|
||
|
||
bool user_may_gc(User *u, bool drop_not_started) {
|
||
assert(u);
|
||
|
||
if (drop_not_started && !u->started)
|
||
return true;
|
||
|
||
if (u->sessions)
|
||
return false;
|
||
|
||
if (user_check_linger_file(u) > 0)
|
||
return false;
|
||
|
||
if (u->slice_job && manager_job_is_active(u->manager, u->slice_job))
|
||
return false;
|
||
|
||
if (u->service_job && manager_job_is_active(u->manager, u->service_job))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
void user_add_to_gc_queue(User *u) {
|
||
assert(u);
|
||
|
||
if (u->in_gc_queue)
|
||
return;
|
||
|
||
LIST_PREPEND(gc_queue, u->manager->user_gc_queue, u);
|
||
u->in_gc_queue = true;
|
||
}
|
||
|
||
UserState user_get_state(User *u) {
|
||
Session *i;
|
||
|
||
assert(u);
|
||
|
||
if (u->stopping)
|
||
return USER_CLOSING;
|
||
|
||
if (!u->started || u->slice_job || u->service_job)
|
||
return USER_OPENING;
|
||
|
||
if (u->sessions) {
|
||
bool all_closing = true;
|
||
|
||
LIST_FOREACH(sessions_by_user, i, u->sessions) {
|
||
SessionState state;
|
||
|
||
state = session_get_state(i);
|
||
if (state == SESSION_ACTIVE)
|
||
return USER_ACTIVE;
|
||
if (state != SESSION_CLOSING)
|
||
all_closing = false;
|
||
}
|
||
|
||
return all_closing ? USER_CLOSING : USER_ONLINE;
|
||
}
|
||
|
||
if (user_check_linger_file(u) > 0)
|
||
return USER_LINGERING;
|
||
|
||
return USER_CLOSING;
|
||
}
|
||
|
||
int user_kill(User *u, int signo) {
|
||
assert(u);
|
||
|
||
return manager_kill_unit(u->manager, u->slice, KILL_ALL, signo, NULL);
|
||
}
|
||
|
||
static bool elect_display_filter(Session *s) {
|
||
/* Return true if the session is a candidate for the user’s ‘primary
|
||
* session’ or ‘display’. */
|
||
assert(s);
|
||
|
||
return (s->class == SESSION_USER && !s->stopping);
|
||
}
|
||
|
||
static int elect_display_compare(Session *s1, Session *s2) {
|
||
/* Indexed by SessionType. Lower numbers mean more preferred. */
|
||
const int type_ranks[_SESSION_TYPE_MAX] = {
|
||
[SESSION_UNSPECIFIED] = 0,
|
||
[SESSION_TTY] = -2,
|
||
[SESSION_X11] = -3,
|
||
[SESSION_WAYLAND] = -3,
|
||
[SESSION_MIR] = -3,
|
||
[SESSION_WEB] = -1,
|
||
};
|
||
|
||
/* Calculate the partial order relationship between s1 and s2,
|
||
* returning < 0 if s1 is preferred as the user’s ‘primary session’,
|
||
* 0 if s1 and s2 are equally preferred or incomparable, or > 0 if s2
|
||
* is preferred.
|
||
*
|
||
* s1 or s2 may be NULL. */
|
||
if (!s1 && !s2)
|
||
return 0;
|
||
|
||
if ((s1 == NULL) != (s2 == NULL))
|
||
return (s1 == NULL) - (s2 == NULL);
|
||
|
||
if (s1->stopping != s2->stopping)
|
||
return s1->stopping - s2->stopping;
|
||
|
||
if ((s1->class != SESSION_USER) != (s2->class != SESSION_USER))
|
||
return (s1->class != SESSION_USER) - (s2->class != SESSION_USER);
|
||
|
||
if ((s1->type == _SESSION_TYPE_INVALID) != (s2->type == _SESSION_TYPE_INVALID))
|
||
return (s1->type == _SESSION_TYPE_INVALID) - (s2->type == _SESSION_TYPE_INVALID);
|
||
|
||
if (s1->type != s2->type)
|
||
return type_ranks[s1->type] - type_ranks[s2->type];
|
||
|
||
return 0;
|
||
}
|
||
|
||
void user_elect_display(User *u) {
|
||
Session *s;
|
||
|
||
assert(u);
|
||
|
||
/* This elects a primary session for each user, which we call
|
||
* the "display". We try to keep the assignment stable, but we
|
||
* "upgrade" to better choices. */
|
||
log_debug("Electing new display for user %s", u->name);
|
||
|
||
LIST_FOREACH(sessions_by_user, s, u->sessions) {
|
||
if (!elect_display_filter(s)) {
|
||
log_debug("Ignoring session %s", s->id);
|
||
continue;
|
||
}
|
||
|
||
if (elect_display_compare(s, u->display) < 0) {
|
||
log_debug("Choosing session %s in preference to %s", s->id, u->display ? u->display->id : "-");
|
||
u->display = s;
|
||
}
|
||
}
|
||
}
|
||
|
||
static const char* const user_state_table[_USER_STATE_MAX] = {
|
||
[USER_OFFLINE] = "offline",
|
||
[USER_OPENING] = "opening",
|
||
[USER_LINGERING] = "lingering",
|
||
[USER_ONLINE] = "online",
|
||
[USER_ACTIVE] = "active",
|
||
[USER_CLOSING] = "closing"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
|
||
|
||
int config_parse_tmpfs_size(
|
||
const char* unit,
|
||
const char *filename,
|
||
unsigned line,
|
||
const char *section,
|
||
unsigned section_line,
|
||
const char *lvalue,
|
||
int ltype,
|
||
const char *rvalue,
|
||
void *data,
|
||
void *userdata) {
|
||
|
||
size_t *sz = data;
|
||
int r;
|
||
|
||
assert(filename);
|
||
assert(lvalue);
|
||
assert(rvalue);
|
||
assert(data);
|
||
|
||
/* First, try to parse as percentage */
|
||
r = parse_percent(rvalue);
|
||
if (r > 0 && r < 100)
|
||
*sz = physical_memory_scale(r, 100U);
|
||
else {
|
||
uint64_t k;
|
||
|
||
/* If the passed argument was not a percentage, or out of range, parse as byte size */
|
||
|
||
r = parse_size(rvalue, 1024, &k);
|
||
if (r < 0 || k <= 0 || (uint64_t) (size_t) k != k) {
|
||
log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
|
||
return 0;
|
||
}
|
||
|
||
*sz = PAGE_ALIGN((size_t) k);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int config_parse_compat_user_tasks_max(
|
||
const char *unit,
|
||
const char *filename,
|
||
unsigned line,
|
||
const char *section,
|
||
unsigned section_line,
|
||
const char *lvalue,
|
||
int ltype,
|
||
const char *rvalue,
|
||
void *data,
|
||
void *userdata) {
|
||
|
||
assert(filename);
|
||
assert(lvalue);
|
||
assert(rvalue);
|
||
assert(data);
|
||
|
||
log_syntax(unit, LOG_NOTICE, filename, line, 0,
|
||
"Support for option %s= has been removed.",
|
||
lvalue);
|
||
log_info("Hint: try creating /etc/systemd/system/user-.slice/50-limits.conf with:\n"
|
||
" [Slice]\n"
|
||
" TasksMax=%s",
|
||
rvalue);
|
||
return 0;
|
||
}
|