1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include <sys/capability.h>
29 #include <security/pam_modules.h>
30 #include <security/_pam_macros.h>
31 #include <security/pam_modutil.h>
32 #include <security/pam_ext.h>
33 #include <security/pam_misc.h>
35 #include <systemd/sd-daemon.h>
40 #include "dbus-common.h"
42 #include "socket-util.h"
44 static int parse_argv(pam_handle_t *handle,
45 int argc, const char **argv,
47 char ***reset_controllers,
49 char ***kill_only_users,
50 char ***kill_exclude_users,
56 assert(argc == 0 || argv);
58 for (i = 0; i < (unsigned) argc; i++) {
61 if (startswith(argv[i], "kill-session-processes=")) {
62 if ((k = parse_boolean(argv[i] + 23)) < 0) {
63 pam_syslog(handle, LOG_ERR, "Failed to parse kill-session-processes= argument.");
70 } else if (startswith(argv[i], "kill-session=")) {
71 /* As compatibility for old versions */
73 if ((k = parse_boolean(argv[i] + 13)) < 0) {
74 pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument.");
81 } else if (startswith(argv[i], "controllers=")) {
86 if (!(l = strv_split(argv[i] + 12, ","))) {
87 pam_syslog(handle, LOG_ERR, "Out of memory.");
91 strv_free(*controllers);
95 } else if (startswith(argv[i], "reset-controllers=")) {
97 if (reset_controllers) {
100 if (!(l = strv_split(argv[i] + 18, ","))) {
101 pam_syslog(handle, LOG_ERR, "Out of memory.");
105 strv_free(*reset_controllers);
106 *reset_controllers = l;
109 } else if (startswith(argv[i], "kill-only-users=")) {
111 if (kill_only_users) {
114 if (!(l = strv_split(argv[i] + 16, ","))) {
115 pam_syslog(handle, LOG_ERR, "Out of memory.");
119 strv_free(*kill_only_users);
120 *kill_only_users = l;
123 } else if (startswith(argv[i], "kill-exclude-users=")) {
125 if (kill_exclude_users) {
128 if (!(l = strv_split(argv[i] + 19, ","))) {
129 pam_syslog(handle, LOG_ERR, "Out of memory.");
133 strv_free(*kill_exclude_users);
134 *kill_exclude_users = l;
137 } else if (startswith(argv[i], "debug=")) {
138 if ((k = parse_boolean(argv[i] + 6)) < 0) {
139 pam_syslog(handle, LOG_ERR, "Failed to parse debug= argument.");
146 } else if (startswith(argv[i], "create-session=") ||
147 startswith(argv[i], "kill-user=")) {
149 pam_syslog(handle, LOG_WARNING, "Option %s not supported anymore, ignoring.", argv[i]);
152 pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
160 static int get_user_data(
161 pam_handle_t *handle,
162 const char **ret_username,
163 struct passwd **ret_pw) {
165 const char *username = NULL;
166 struct passwd *pw = NULL;
171 assert(ret_username);
174 r = audit_loginuid_from_pid(0, &uid);
176 pw = pam_modutil_getpwuid(handle, uid);
178 r = pam_get_user(handle, &username, NULL);
179 if (r != PAM_SUCCESS) {
180 pam_syslog(handle, LOG_ERR, "Failed to get user name.");
184 if (isempty(username)) {
185 pam_syslog(handle, LOG_ERR, "User name not valid.");
189 pw = pam_modutil_getpwnam(handle, username);
193 pam_syslog(handle, LOG_ERR, "Failed to get user data.");
194 return PAM_USER_UNKNOWN;
198 *ret_username = username ? username : pw->pw_name;
203 static bool check_user_lists(
204 pam_handle_t *handle,
206 char **kill_only_users,
207 char **kill_exclude_users) {
209 const char *name = NULL;
215 name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
219 pw = pam_modutil_getpwuid(handle, uid);
224 STRV_FOREACH(l, kill_exclude_users) {
227 if (parse_uid(*l, &u) >= 0)
231 if (name && streq(name, *l))
235 if (strv_isempty(kill_only_users))
238 STRV_FOREACH(l, kill_only_users) {
241 if (parse_uid(*l, &u) >= 0)
245 if (name && streq(name, *l))
252 static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) {
256 union sockaddr_union sa;
265 /* We deduce the X11 socket from the display name, then use
266 * SO_PEERCRED to determine the X11 server process, ask for
267 * the controlling tty of that and if it's a VC then we know
268 * the seat and the virtual terminal. Sounds ugly, is only
271 r = socket_from_display(display, &p);
275 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
282 sa.un.sun_family = AF_UNIX;
283 strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1);
286 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
287 close_nointr_nofail(fd);
292 r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l);
293 close_nointr_nofail(fd);
298 r = get_ctty(ucred.pid, NULL, &tty);
302 v = vtnr_from_tty(tty);
312 *vtnr = (uint32_t) v;
317 _public_ PAM_EXTERN int pam_sm_open_session(
318 pam_handle_t *handle,
320 int argc, const char **argv) {
323 bool kill_processes = false, debug = false;
324 const char *username, *id, *object_path, *runtime_path, *service = NULL, *tty = NULL, *display = NULL, *remote_user = NULL, *remote_host = NULL, *seat = NULL, *type, *cvtnr = NULL;
325 char **controllers = NULL, **reset_controllers = NULL, **kill_only_users = NULL, **kill_exclude_users = NULL;
328 DBusMessageIter iter;
331 DBusConnection *bus = NULL;
332 DBusMessage *m = NULL, *reply = NULL;
339 dbus_error_init(&error);
341 /* pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); */
343 /* Make this a NOP on non-systemd systems */
344 if (sd_booted() <= 0)
347 if (parse_argv(handle,
349 &controllers, &reset_controllers,
350 &kill_processes, &kill_only_users, &kill_exclude_users,
356 r = get_user_data(handle, &username, &pw);
357 if (r != PAM_SUCCESS)
360 /* Make sure we don't enter a loop by talking to
361 * systemd-logind when it is actually waiting for the
362 * background to finish start-up. If the service is
363 * "systemd-shared" we simply set XDG_RUNTIME_DIR and
366 pam_get_item(handle, PAM_SERVICE, (const void**) &service);
367 if (streq_ptr(service, "systemd-shared")) {
370 if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) pw->pw_uid) < 0) {
375 r = parse_env_file(p, NEWLINE,
380 if (r < 0 && r != -ENOENT) {
387 r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0);
390 if (r != PAM_SUCCESS) {
391 pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
401 kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);
403 dbus_connection_set_change_sigpipe(FALSE);
405 bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
407 pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
412 m = dbus_message_new_method_call(
413 "org.freedesktop.login1",
414 "/org/freedesktop/login1",
415 "org.freedesktop.login1.Manager",
419 pam_syslog(handle, LOG_ERR, "Could not allocate create session message.");
427 pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
428 pam_get_item(handle, PAM_TTY, (const void**) &tty);
429 pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
430 pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
431 seat = pam_getenv(handle, "XDG_SEAT");
432 cvtnr = pam_getenv(handle, "XDG_VTNR");
434 service = strempty(service);
436 display = strempty(display);
437 remote_user = strempty(remote_user);
438 remote_host = strempty(remote_host);
439 seat = strempty(seat);
441 if (strchr(tty, ':')) {
442 /* A tty with a colon is usually an X11 display, place
443 * there to show up in utmp. We rearrange things and
444 * don't pretend that an X display was a tty */
446 if (isempty(display))
449 } else if (streq(tty, "cron")) {
450 /* cron has been setting PAM_TTY to "cron" for a very long time
451 * and it cannot stop doing that for compatibility reasons. */
456 safe_atou32(cvtnr, &vtnr);
458 if (!isempty(display) && vtnr <= 0) {
460 get_seat_from_display(display, &seat, &vtnr);
461 else if (streq(seat, "seat0"))
462 get_seat_from_display(display, NULL, &vtnr);
465 type = !isempty(display) ? "x11" :
466 !isempty(tty) ? "tty" : "unspecified";
468 remote = !isempty(remote_host) && !streq(remote_host, "localhost") && !streq(remote_host, "localhost.localdomain");
470 if (!dbus_message_append_args(m,
471 DBUS_TYPE_UINT32, &uid,
472 DBUS_TYPE_UINT32, &pid,
473 DBUS_TYPE_STRING, &service,
474 DBUS_TYPE_STRING, &type,
475 DBUS_TYPE_STRING, &seat,
476 DBUS_TYPE_UINT32, &vtnr,
477 DBUS_TYPE_STRING, &tty,
478 DBUS_TYPE_STRING, &display,
479 DBUS_TYPE_BOOLEAN, &remote,
480 DBUS_TYPE_STRING, &remote_user,
481 DBUS_TYPE_STRING, &remote_host,
482 DBUS_TYPE_INVALID)) {
483 pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
488 dbus_message_iter_init_append(m, &iter);
490 r = bus_append_strv_iter(&iter, controllers);
492 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
497 r = bus_append_strv_iter(&iter, reset_controllers);
499 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
505 if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &kp)) {
506 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
512 pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: "
513 "uid=%u pid=%u service=%s type=%s seat=%s vtnr=%u tty=%s display=%s remote=%s remote_user=%s remote_host=%s",
514 uid, pid, service, type, seat, vtnr, tty, display, yes_no(remote), remote_user, remote_host);
516 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
518 pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error));
523 if (!dbus_message_get_args(reply, &error,
524 DBUS_TYPE_STRING, &id,
525 DBUS_TYPE_OBJECT_PATH, &object_path,
526 DBUS_TYPE_STRING, &runtime_path,
527 DBUS_TYPE_UNIX_FD, &session_fd,
528 DBUS_TYPE_STRING, &seat,
529 DBUS_TYPE_UINT32, &vtnr,
530 DBUS_TYPE_INVALID)) {
531 pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", bus_error_message(&error));
537 pam_syslog(handle, LOG_DEBUG, "Reply from logind: "
538 "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u",
539 id, object_path, runtime_path, session_fd, seat, vtnr);
541 r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0);
542 if (r != PAM_SUCCESS) {
543 pam_syslog(handle, LOG_ERR, "Failed to set session id.");
547 r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0);
548 if (r != PAM_SUCCESS) {
549 pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
553 if (!isempty(seat)) {
554 r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0);
555 if (r != PAM_SUCCESS) {
556 pam_syslog(handle, LOG_ERR, "Failed to set seat.");
563 snprintf(buf, sizeof(buf), "%u", vtnr);
566 r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0);
567 if (r != PAM_SUCCESS) {
568 pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number.");
573 if (session_fd >= 0) {
574 r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL);
575 if (r != PAM_SUCCESS) {
576 pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
586 strv_free(controllers);
587 strv_free(reset_controllers);
588 strv_free(kill_only_users);
589 strv_free(kill_exclude_users);
591 dbus_error_free(&error);
594 dbus_connection_close(bus);
595 dbus_connection_unref(bus);
599 dbus_message_unref(m);
602 dbus_message_unref(reply);
605 close_nointr_nofail(session_fd);
610 _public_ PAM_EXTERN int pam_sm_close_session(
611 pam_handle_t *handle,
613 int argc, const char **argv) {
615 const void *p = NULL;
617 pam_get_data(handle, "systemd.session-fd", &p);
620 close_nointr(PTR_TO_INT(p) - 1);