-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <sys/mount.h>
+#include <errno.h>
#include <string.h>
+#include <sys/mount.h>
#include <unistd.h>
-#include <errno.h>
-#include "util.h"
-#include "mkdir.h"
-#include "rm-rf.h"
-#include "hashmap.h"
-#include "fileio.h"
-#include "path-util.h"
-#include "special.h"
-#include "unit-name.h"
-#include "bus-util.h"
+#include "alloc-util.h"
+#include "bus-common-errors.h"
#include "bus-error.h"
-#include "conf-parser.h"
+#include "bus-util.h"
+#include "cgroup-util.h"
#include "clean-ipc.h"
+#include "conf-parser.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "format-util.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "label.h"
#include "logind-user.h"
+#include "mkdir.h"
+#include "mount-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "rm-rf.h"
#include "smack-util.h"
-#include "formats-util.h"
+//#include "special.h"
+#include "stdio-util.h"
+#include "string-table.h"
+#include "unit-name.h"
+#include "user-util.h"
+#include "util.h"
-User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
- User *u;
+#if 1 /// elogind uses a static value here
+# define SPECIAL_USER_SLICE "user.slice"
+#endif // 1
+int user_new(User **out, Manager *m, uid_t uid, gid_t gid, const char *name) {
+ _cleanup_(user_freep) User *u = NULL;
+ char lu[DECIMAL_STR_MAX(uid_t) + 1];
+ int r;
+ assert(out);
assert(m);
assert(name);
u = new0(User, 1);
if (!u)
- return NULL;
+ return -ENOMEM;
+
+ u->manager = m;
+ u->uid = uid;
+ u->gid = gid;
+ xsprintf(lu, UID_FMT, uid);
u->name = strdup(name);
if (!u->name)
- goto fail;
+ return -ENOMEM;
if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0)
- goto fail;
+ return -ENOMEM;
- if (hashmap_put(m->users, UID_TO_PTR(uid), u) < 0)
- goto fail;
+ if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0)
+ return -ENOMEM;
- u->manager = m;
- u->uid = uid;
- u->gid = gid;
+ r = slice_build_subslice(SPECIAL_USER_SLICE, lu, &u->slice);
+ if (r < 0)
+ return r;
+
+ r = unit_name_build("user", lu, ".service", &u->service);
+ if (r < 0)
+ return r;
- return u;
+ r = hashmap_put(m->users, UID_TO_PTR(uid), u);
+ if (r < 0)
+ return r;
-fail:
- free(u->state_file);
- free(u->name);
- free(u);
+ r = hashmap_put(m->user_units, u->slice, u);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(m->user_units, u->service, u);
+ if (r < 0)
+ return r;
- return NULL;
+ *out = u;
+ u = NULL;
+ return 0;
}
-void user_free(User *u) {
- assert(u);
+User *user_free(User *u) {
+ if (!u)
+ return NULL;
if (u->in_gc_queue)
LIST_REMOVE(gc_queue, u->manager->user_gc_queue, u);
while (u->sessions)
session_free(u->sessions);
- free(u->runtime_path);
+ if (u->service)
+ hashmap_remove_value(u->manager->user_units, u->service, u);
+
+ if (u->slice)
+ hashmap_remove_value(u->manager->user_units, u->slice, u);
- hashmap_remove(u->manager->users, UID_TO_PTR(u->uid));
+ hashmap_remove_value(u->manager->users, UID_TO_PTR(u->uid), u);
- free(u->name);
- free(u->state_file);
- free(u);
+#if 0 /// elogind neither supports slice nor service jobs.
+ u->slice_job = mfree(u->slice_job);
+ u->service_job = mfree(u->service_job);
+#endif // 0
+
+ u->service = mfree(u->service);
+ u->slice = mfree(u->slice);
+ u->runtime_path = mfree(u->runtime_path);
+ u->state_file = mfree(u->state_file);
+ u->name = mfree(u->name);
+
+ return mfree(u);
}
-int user_save(User *u) {
+static int user_save_internal(User *u) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(u);
assert(u->state_file);
- if (!u->started)
- return 0;
-
r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0);
if (r < 0)
- goto finish;
+ goto fail;
r = fopen_temporary(u->state_file, &f, &temp_path);
if (r < 0)
- goto finish;
+ goto fail;
fchmod(fileno(f), 0644);
u->name,
user_state_to_string(user_get_state(u)));
+ /* LEGACY: no-one reads RUNTIME= anymore, drop it at some point */
if (u->runtime_path)
fprintf(f, "RUNTIME=%s\n", u->runtime_path);
+#if 0 /// elogind neither supports service nor slice jobs
+ if (u->service_job)
+ fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
+
+ if (u->slice_job)
+ fprintf(f, "SLICE_JOB=%s\n", u->slice_job);
+#endif // 0
+
if (u->display)
fprintf(f, "DISPLAY=%s\n", u->display->id);
fputc('\n', f);
}
- fflush(f);
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
- if (ferror(f) || rename(temp_path, u->state_file) < 0) {
+ if (rename(temp_path, u->state_file) < 0) {
r = -errno;
- unlink(u->state_file);
- unlink(temp_path);
+ goto fail;
}
-finish:
- if (r < 0)
- log_error_errno(r, "Failed to save user data %s: %m", u->state_file);
+ return 0;
- return r;
+fail:
+ (void) unlink(u->state_file);
+
+ if (temp_path)
+ (void) unlink(temp_path);
+
+ return log_error_errno(r, "Failed to save user data %s: %m", u->state_file);
+}
+
+int user_save(User *u) {
+ assert(u);
+
+ if (!u->started)
+ return 0;
+
+ return user_save_internal (u);
}
int user_load(User *u) {
assert(u);
r = parse_env_file(u->state_file, NEWLINE,
- "RUNTIME", &u->runtime_path,
+#if 0 /// elogind neither supports service nor slice jobs
+ "SERVICE_JOB", &u->service_job,
+ "SLICE_JOB", &u->slice_job,
+#endif // 0
"DISPLAY", &display,
"REALTIME", &realtime,
"MONOTONIC", &monotonic,
if (r == -ENOENT)
return 0;
- log_error_errno(r, "Failed to read %s: %m", u->state_file);
- return r;
+ return log_error_errno(r, "Failed to read %s: %m", u->state_file);
}
if (display)
if (s && s->display && display_is_local(s->display))
u->display = s;
- if (realtime) {
- unsigned long long l;
- if (sscanf(realtime, "%llu", &l) > 0)
- u->timestamp.realtime = l;
- }
-
- if (monotonic) {
- unsigned long long l;
- if (sscanf(monotonic, "%llu", &l) > 0)
- u->timestamp.monotonic = l;
- }
+ if (realtime)
+ timestamp_deserialize(realtime, &u->timestamp.realtime);
+ if (monotonic)
+ timestamp_deserialize(monotonic, &u->timestamp.monotonic);
return r;
}
static int user_mkdir_runtime_path(User *u) {
- char *p;
int r;
assert(u);
if (r < 0)
return log_error_errno(r, "Failed to create /run/user: %m");
- if (!u->runtime_path) {
- if (asprintf(&p, "/run/user/" UID_FMT, u->uid) < 0)
- return log_oom();
- } else
- p = u->runtime_path;
-
- if (path_is_mount_point(p, false) <= 0) {
+ if (path_is_mount_point(u->runtime_path, NULL, 0) <= 0) {
_cleanup_free_ char *t = NULL;
- (void) mkdir(p, 0700);
+ (void) mkdir_label(u->runtime_path, 0700);
if (mac_smack_use())
r = asprintf(&t, "mode=0700,smackfsroot=*,uid=" UID_FMT ",gid=" GID_FMT ",size=%zu", u->uid, u->gid, u->manager->runtime_dir_size);
goto fail;
}
- r = mount("tmpfs", p, "tmpfs", MS_NODEV|MS_NOSUID, t);
+ r = mount("tmpfs", u->runtime_path, "tmpfs", MS_NODEV|MS_NOSUID, t);
if (r < 0) {
- if (errno != EPERM) {
- r = log_error_errno(errno, "Failed to mount per-user tmpfs directory %s: %m", p);
+ if (errno != EPERM && errno != EACCES) {
+ r = log_error_errno(errno, "Failed to mount per-user tmpfs directory %s: %m", u->runtime_path);
goto fail;
}
- /* Lacking permissions, maybe
- * CAP_SYS_ADMIN-less container? In this case,
- * just use a normal directory. */
+ log_debug_errno(errno, "Failed to mount per-user tmpfs directory %s, assuming containerized execution, ignoring: %m", u->runtime_path);
- r = chmod_and_chown(p, 0700, u->uid, u->gid);
+ r = chmod_and_chown(u->runtime_path, 0700, u->uid, u->gid);
if (r < 0) {
log_error_errno(r, "Failed to change runtime directory ownership and mode: %m");
goto fail;
}
}
+
+ r = label_fix(u->runtime_path, false, false);
+ if (r < 0)
+ log_warning_errno(r, "Failed to fix label of '%s', ignoring: %m", u->runtime_path);
}
- u->runtime_path = p;
return 0;
fail:
- if (p) {
- /* Try to clean up, but ignore errors */
- (void) rmdir(p);
- free(p);
+ /* Try to clean up, but ignore errors */
+ (void) rmdir(u->runtime_path);
+ return r;
+}
+
+static int user_start_slice(User *u) {
+#if 0 /// elogind can not ask systemd via dbus to start user services
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ const char *description;
+ char *job;
+ int r;
+
+ assert(u);
+
+ u->slice_job = mfree(u->slice_job);
+ description = strjoina("User Slice of ", u->name);
+
+ r = manager_start_slice(
+ u->manager,
+ u->slice,
+ description,
+ "systemd-logind.service",
+ "systemd-user-sessions.service",
+ u->manager->user_tasks_max,
+ &error,
+ &job);
+ if (r >= 0)
+ u->slice_job = job;
+ else if (!sd_bus_error_has_name(&error, BUS_ERROR_UNIT_EXISTS))
+ /* we don't fail due to this, let's try to continue */
+ log_error_errno(r, "Failed to start user slice %s, ignoring: %s (%s)",
+ u->slice, bus_error_message(&error, r), error.name);
+#else
+ assert(u);
+
+ hashmap_put(u->manager->user_units, u->slice, u);
+#endif // 0
+
+ return 0;
+}
+
+static int user_start_service(User *u) {
+#if 0 /// elogind can not ask systemd via dbus to start user services
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ char *job;
+ int r;
+
+ assert(u);
+
+ u->service_job = mfree(u->service_job);
+
+ r = manager_start_unit(
+ u->manager,
+ u->service,
+ &error,
+ &job);
+ if (r < 0) {
+ /* we don't fail due to this, let's try to continue */
+ log_error_errno(r, "Failed to start user service, ignoring: %s", bus_error_message(&error, r));
+ } else {
+ u->service_job = job;
}
+#else
+ assert(u);
- u->runtime_path = NULL;
- return r;
+ hashmap_put(u->manager->user_units, u->service, u);
+#endif // 0
+
+ return 0;
}
int user_start(User *u) {
assert(u);
- if (u->started)
+ if (u->started && !u->stopping)
return 0;
- log_debug("New user %s logged in.", u->name);
+ /*
+ * 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
+ * restart), but if they fail, we want to force another user_stop() so
+ * 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
+ * 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("New user %s logged in.", u->name);
+
+ /* Make XDG_RUNTIME_DIR */
+ r = user_mkdir_runtime_path(u);
+ if (r < 0)
+ return r;
+ }
- /* Make XDG_RUNTIME_DIR */
- r = user_mkdir_runtime_path(u);
+ /* Create cgroup */
+ r = user_start_slice(u);
if (r < 0)
return r;
- if (!dual_timestamp_is_set(&u->timestamp))
- dual_timestamp_get(&u->timestamp);
+ /* 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);
- u->started = true;
+ /* 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);
- user_send_signal(u, true);
-
return 0;
}
-static int user_remove_runtime_path(User *u) {
+#if 0 /// UNNEEDED by elogind
+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);
- if (!u->runtime_path)
- return 0;
+ 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(u->service_job);
+ u->service_job = job;
+
+ return r;
+}
+#endif // 0
+
+static int user_remove_runtime_path(User *u) {
+ int r;
+
+ assert(u);
r = rm_rf(u->runtime_path, 0);
if (r < 0)
if (r < 0)
log_error_errno(r, "Failed to remove runtime directory %s: %m", u->runtime_path);
- free(u->runtime_path);
- u->runtime_path = NULL;
-
return r;
}
r = k;
}
+ /* Kill systemd */
+#if 0 /// elogind does not support service or slice jobs
+ k = user_stop_service(u);
+ if (k < 0)
+ r = k;
+
+ /* Kill cgroup */
+ k = user_stop_slice(u);
+ if (k < 0)
+ r = k;
+#endif // 0
+
u->stopping = true;
user_save(u);
if (k < 0)
r = k;
- /* Clean SysV + POSIX IPC objects */
- if (u->manager->remove_ipc) {
- k = clean_ipc(u->uid);
+ /* 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 && u->uid > SYSTEM_UID_MAX) {
+ k = clean_ipc_by_uid(u->uid);
if (k < 0)
r = k;
}
int user_get_idle_hint(User *u, dual_timestamp *t) {
Session *s;
bool idle_hint = true;
- dual_timestamp ts = { 0, 0 };
+ dual_timestamp ts = DUAL_TIMESTAMP_NULL;
assert(u);
if (user_check_linger_file(u) > 0)
return true;
+#if 0 /// elogind neither supports service nor slice jobs
+ if (u->slice_job && manager_job_is_active(u->manager, u->slice_job))
+ return true;
+
+ if (u->service_job && manager_job_is_active(u->manager, u->service_job))
+ return true;
+#endif // 0
+
return false;
}
if (u->stopping)
return USER_CLOSING;
+#if 0 /// elogind neither supports service nor slice jobs.
+ if (!u->started || u->slice_job || u->service_job)
+#else
+ if (!u->started)
+#endif // 0
+ return USER_OPENING;
+
if (u->sessions) {
bool all_closing = true;
}
int user_kill(User *u, int signo) {
+#if 0 /// Without systemd unit support, elogind has to rely on its session system
+ assert(u);
+
+ return manager_kill_unit(u->manager, u->slice, KILL_ALL, signo, NULL);
+#else
Session *s;
int res = 0;
}
return res;
+#endif // 0
+}
+
+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 *graphical = NULL, *text = NULL, *other = NULL, *s;
+ 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 (s->class != SESSION_USER)
- continue;
-
- if (s->stopping)
+ if (!elect_display_filter(s)) {
+ log_debug("Ignoring session %s", s->id);
continue;
+ }
- if (SESSION_TYPE_IS_GRAPHICAL(s->type))
- graphical = s;
- else if (s->type == SESSION_TTY)
- text = s;
- else
- other = s;
- }
-
- if (graphical &&
- (!u->display ||
- u->display->class != SESSION_USER ||
- u->display->stopping ||
- !SESSION_TYPE_IS_GRAPHICAL(u->display->type))) {
- u->display = graphical;
- return;
- }
-
- if (text &&
- (!u->display ||
- u->display->class != SESSION_USER ||
- u->display->stopping ||
- u->display->type != SESSION_TTY)) {
- u->display = text;
- return;
+ 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;
+ }
}
-
- if (other &&
- (!u->display ||
- u->display->class != SESSION_USER ||
- u->display->stopping))
- u->display = other;
}
static const char* const user_state_table[_USER_STATE_MAX] = {
void *userdata) {
size_t *sz = data;
- const char *e;
int r;
assert(filename);
assert(rvalue);
assert(data);
- e = endswith(rvalue, "%");
- if (e) {
- unsigned long ul;
- char *f;
+ /* 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;
- errno = 0;
- ul = strtoul(rvalue, &f, 10);
- if (errno != 0 || f != e) {
- log_syntax(unit, LOG_ERR, filename, line, errno ? errno : EINVAL, "Failed to parse percentage value, ignoring: %s", rvalue);
- return 0;
- }
+ /* If the passed argument was not a percentage, or out of range, parse as byte size */
- if (ul <= 0 || ul >= 100) {
- log_syntax(unit, LOG_ERR, filename, line, errno ? errno : EINVAL, "Percentage value out of range, ignoring: %s", rvalue);
+ 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) ((physical_memory() * (uint64_t) ul) / (uint64_t) 100));
- } else {
- off_t o;
+ *sz = PAGE_ALIGN((size_t) k);
+ }
+
+ return 0;
+}
+
+int config_parse_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) {
+
+ uint64_t *m = data;
+ uint64_t k;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if (isempty(rvalue)) {
+ *m = system_tasks_max_scale(DEFAULT_USER_TASKS_MAX_PERCENTAGE, 100U);
+ return 0;
+ }
+
+ if (streq(rvalue, "infinity")) {
+ *m = CGROUP_LIMIT_MAX;
+ return 0;
+ }
+
+ /* Try to parse as percentage */
+ r = parse_percent(rvalue);
+ if (r >= 0)
+ k = system_tasks_max_scale(r, 100U);
+ else {
+
+ /* If the passed argument was not a percentage, or out of range, parse as byte size */
- r = parse_size(rvalue, 1024, &o);
- if (r < 0 || (off_t) (size_t) o != o) {
- log_syntax(unit, LOG_ERR, filename, line, r < 0 ? -r : ERANGE, "Failed to parse size value, ignoring: %s", rvalue);
+ r = safe_atou64(rvalue, &k);
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse tasks maximum, ignoring: %s", rvalue);
return 0;
}
+ }
- *sz = PAGE_ALIGN((size_t) o);
+ if (k <= 0 || k >= UINT64_MAX) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Tasks maximum out of range, ignoring: %s", rvalue);
+ return 0;
}
+ *m = k;
return 0;
}
~ianmdlvl / elogind.git / blobdiff