diff options
Diffstat (limited to 'src/login/logind-user.c')
| -rw-r--r-- | src/login/logind-user.c | 930 |
1 files changed, 0 insertions, 930 deletions
diff --git a/src/login/logind-user.c b/src/login/logind-user.c deleted file mode 100644 index 2dc5fa7665..0000000000 --- a/src/login/logind-user.c +++ /dev/null @@ -1,930 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2011 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <errno.h> -#include <string.h> -#include <sys/mount.h> -#include <unistd.h> - -#include "alloc-util.h" -#include "bus-common-errors.h" -#include "bus-error.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 "formats-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 "special.h" -#include "stdio-util.h" -#include "string-table.h" -#include "unit-name.h" -#include "user-util.h" -#include "util.h" - -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 -ENOMEM; - - u->manager = m; - u->uid = uid; - u->gid = gid; - xsprintf(lu, UID_FMT, uid); - - u->name = strdup(name); - if (!u->name) - return -ENOMEM; - - if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0) - return -ENOMEM; - - if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0) - return -ENOMEM; - - 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; - - r = hashmap_put(m->users, UID_TO_PTR(uid), u); - if (r < 0) - return r; - - 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; - - *out = u; - u = NULL; - return 0; -} - -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); - - 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_value(u->manager->users, UID_TO_PTR(u->uid), u); - - u->slice_job = mfree(u->slice_job); - u->service_job = mfree(u->service_job); - - 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); -} - -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); - - r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0); - if (r < 0) - goto fail; - - r = fopen_temporary(u->state_file, &f, &temp_path); - if (r < 0) - goto fail; - - fchmod(fileno(f), 0644); - - fprintf(f, - "# This is private data. Do not parse.\n" - "NAME=%s\n" - "STATE=%s\n", - 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 (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); - - if (u->display) - fprintf(f, "DISPLAY=%s\n", u->display->id); - - if (dual_timestamp_is_set(&u->timestamp)) - fprintf(f, - "REALTIME="USEC_FMT"\n" - "MONOTONIC="USEC_FMT"\n", - u->timestamp.realtime, - u->timestamp.monotonic); - - if (u->sessions) { - Session *i; - bool first; - - fputs("SESSIONS=", f); - first = true; - LIST_FOREACH(sessions_by_user, i, u->sessions) { - if (first) - first = false; - else - fputc(' ', f); - - fputs(i->id, f); - } - - fputs("\nSEATS=", f); - first = true; - LIST_FOREACH(sessions_by_user, i, u->sessions) { - if (!i->seat) - continue; - - if (first) - first = false; - else - fputc(' ', f); - - fputs(i->seat->id, f); - } - - fputs("\nACTIVE_SESSIONS=", f); - first = true; - LIST_FOREACH(sessions_by_user, i, u->sessions) { - if (!session_is_active(i)) - continue; - - if (first) - first = false; - else - fputc(' ', f); - - fputs(i->id, f); - } - - fputs("\nONLINE_SESSIONS=", f); - first = true; - LIST_FOREACH(sessions_by_user, i, u->sessions) { - if (session_get_state(i) == SESSION_CLOSING) - continue; - - if (first) - first = false; - else - fputc(' ', f); - - fputs(i->id, f); - } - - fputs("\nACTIVE_SEATS=", f); - first = true; - LIST_FOREACH(sessions_by_user, i, u->sessions) { - if (!session_is_active(i) || !i->seat) - continue; - - if (first) - first = false; - else - fputc(' ', f); - - fputs(i->seat->id, f); - } - - fputs("\nONLINE_SEATS=", f); - first = true; - LIST_FOREACH(sessions_by_user, i, u->sessions) { - if (session_get_state(i) == SESSION_CLOSING || !i->seat) - continue; - - if (first) - first = false; - else - fputc(' ', f); - - fputs(i->seat->id, f); - } - fputc('\n', f); - } - - r = fflush_and_check(f); - if (r < 0) - goto fail; - - if (rename(temp_path, u->state_file) < 0) { - r = -errno; - goto fail; - } - - return 0; - -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) { - _cleanup_free_ char *display = NULL, *realtime = NULL, *monotonic = NULL; - Session *s = NULL; - int r; - - assert(u); - - r = parse_env_file(u->state_file, NEWLINE, - "SERVICE_JOB", &u->service_job, - "SLICE_JOB", &u->slice_job, - "DISPLAY", &display, - "REALTIME", &realtime, - "MONOTONIC", &monotonic, - NULL); - if (r < 0) { - if (r == -ENOENT) - return 0; - - return log_error_errno(r, "Failed to read %s: %m", u->state_file); - } - - if (display) - s = hashmap_get(u->manager->sessions, display); - - if (s && s->display && display_is_local(s->display)) - u->display = s; - - 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) { - int r; - - assert(u); - - r = mkdir_safe_label("/run/user", 0755, 0, 0); - if (r < 0) - return log_error_errno(r, "Failed to create /run/user: %m"); - - if (path_is_mount_point(u->runtime_path, 0) <= 0) { - _cleanup_free_ char *t = NULL; - - (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); - else - r = asprintf(&t, "mode=0700,uid=" UID_FMT ",gid=" GID_FMT ",size=%zu", u->uid, u->gid, u->manager->runtime_dir_size); - if (r < 0) { - r = log_oom(); - goto fail; - } - - r = mount("tmpfs", u->runtime_path, "tmpfs", MS_NODEV|MS_NOSUID, t); - if (r < 0) { - if (errno != EPERM && errno != EACCES) { - r = log_error_errno(errno, "Failed to mount per-user tmpfs directory %s: %m", u->runtime_path); - goto fail; - } - - log_debug_errno(errno, "Failed to mount per-user tmpfs directory %s, assuming containerized execution, ignoring: %m", u->runtime_path); - - 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); - } - - return 0; - -fail: - /* Try to clean up, but ignore errors */ - (void) rmdir(u->runtime_path); - return r; -} - -static int user_start_slice(User *u) { - _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); - - return 0; -} - -static int user_start_service(User *u) { - _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; - } - - return 0; -} - -int user_start(User *u) { - int r; - - 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 - * 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; - } - - /* Create cgroup */ - r = user_start_slice(u); - if (r < 0) - return r; - - /* 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(u->service_job); - u->service_job = job; - - return r; -} - -static int user_remove_runtime_path(User *u) { - int r; - - assert(u); - - r = rm_rf(u->runtime_path, 0); - if (r < 0) - log_error_errno(r, "Failed to remove runtime directory %s: %m", u->runtime_path); - - /* Ignore cases where the directory isn't mounted, as that's - * quite possible, if we lacked the permissions to mount - * something */ - r = umount2(u->runtime_path, MNT_DETACH); - if (r < 0 && errno != EINVAL && errno != ENOENT) - log_error_errno(errno, "Failed to unmount user runtime directory %s: %m", u->runtime_path); - - r = rm_rf(u->runtime_path, REMOVE_ROOT); - if (r < 0) - log_error_errno(r, "Failed to remove runtime directory %s: %m", u->runtime_path); - - 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; - } - - /* Kill XDG_RUNTIME_DIR */ - k = user_remove_runtime_path(u); - 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 && u->uid > SYSTEM_UID_MAX) { - 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_check_gc(User *u, bool drop_not_started) { - assert(u); - - if (drop_not_started && !u->started) - return false; - - if (u->sessions) - return true; - - if (user_check_linger_file(u) > 0) - return true; - - 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; - - return false; -} - -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_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 = 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; - } - } - - 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; -} |