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>
37 #include "sd-daemon.h"
39 #include "dbus-common.h"
42 static int parse_argv(pam_handle_t *handle,
43 int argc, const char **argv,
45 char ***reset_controllers,
47 char ***kill_only_users,
48 char ***kill_exclude_users,
52 bool reset_controller_set = false;
53 bool kill_exclude_users_set = false;
56 assert(argc == 0 || argv);
58 for (i = 0; i < (unsigned) argc; i++) {
61 if (startswith(argv[i], "kill-processes=")) {
62 if ((k = parse_boolean(argv[i] + 15)) < 0) {
63 pam_syslog(handle, LOG_ERR, "Failed to parse kill-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 reset_controller_set = true;
111 } else if (startswith(argv[i], "kill-only-users=")) {
113 if (kill_only_users) {
116 if (!(l = strv_split(argv[i] + 16, ","))) {
117 pam_syslog(handle, LOG_ERR, "Out of memory.");
121 strv_free(*kill_only_users);
122 *kill_only_users = l;
125 } else if (startswith(argv[i], "kill-exclude-users=")) {
127 if (kill_exclude_users) {
130 if (!(l = strv_split(argv[i] + 19, ","))) {
131 pam_syslog(handle, LOG_ERR, "Out of memory.");
135 strv_free(*kill_exclude_users);
136 *kill_exclude_users = l;
139 kill_exclude_users_set = true;
141 } else if (startswith(argv[i], "debug=")) {
142 if ((k = parse_boolean(argv[i] + 6)) < 0) {
143 pam_syslog(handle, LOG_ERR, "Failed to parse debug= argument.");
150 } else if (startswith(argv[i], "create-session=") ||
151 startswith(argv[i], "kill-user=")) {
153 pam_syslog(handle, LOG_WARNING, "Option %s not supported anymore, ignoring.", argv[i]);
156 pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
161 if (!reset_controller_set && reset_controllers) {
164 if (!(l = strv_new("cpu", NULL))) {
165 pam_syslog(handle, LOG_ERR, "Out of memory");
169 *reset_controllers = l;
173 strv_remove(*controllers, SYSTEMD_CGROUP_CONTROLLER);
175 if (reset_controllers)
176 strv_remove(*reset_controllers, SYSTEMD_CGROUP_CONTROLLER);
178 if (!kill_exclude_users_set && kill_exclude_users) {
181 if (!(l = strv_new("root", NULL))) {
182 pam_syslog(handle, LOG_ERR, "Out of memory");
186 *kill_exclude_users = l;
192 static int get_user_data(
193 pam_handle_t *handle,
194 const char **ret_username,
195 struct passwd **ret_pw) {
197 const char *username = NULL;
198 struct passwd *pw = NULL;
200 bool have_loginuid = false;
204 assert(ret_username);
207 if (have_effective_cap(CAP_AUDIT_CONTROL) > 0) {
208 /* Only use audit login uid if we are executed with
209 * sufficient capabilities so that pam_loginuid could
210 * do its job. If we are lacking the CAP_AUDIT_CONTROL
211 * capabality we most likely are being run in a
212 * container and /proc/self/loginuid is useless since
213 * it probably contains a uid of the host system. */
215 if (read_one_line_file("/proc/self/loginuid", &s) >= 0) {
218 r = safe_atou32(s, &u);
221 if (r >= 0 && u != (uint32_t) -1 && u > 0) {
222 have_loginuid = true;
223 pw = pam_modutil_getpwuid(handle, u);
228 if (!have_loginuid) {
229 if ((r = pam_get_user(handle, &username, NULL)) != PAM_SUCCESS) {
230 pam_syslog(handle, LOG_ERR, "Failed to get user name.");
234 if (!username || !*username) {
235 pam_syslog(handle, LOG_ERR, "User name not valid.");
239 pw = pam_modutil_getpwnam(handle, username);
243 pam_syslog(handle, LOG_ERR, "Failed to get user data.");
244 return PAM_USER_UNKNOWN;
248 *ret_username = username ? username : pw->pw_name;
253 static bool check_user_lists(
254 pam_handle_t *handle,
256 char **kill_only_users,
257 char **kill_exclude_users) {
259 const char *name = NULL;
265 name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
269 pw = pam_modutil_getpwuid(handle, uid);
274 STRV_FOREACH(l, kill_exclude_users) {
277 if (safe_atou32(*l, &id) >= 0)
278 if ((uid_t) id == uid)
281 if (name && streq(name, *l))
285 if (strv_isempty(kill_only_users))
288 STRV_FOREACH(l, kill_only_users) {
291 if (safe_atou32(*l, &id) >= 0)
292 if ((uid_t) id == uid)
295 if (name && streq(name, *l))
302 _public_ PAM_EXTERN int pam_sm_open_session(
303 pam_handle_t *handle,
305 int argc, const char **argv) {
308 bool kill_processes = false, debug = false;
309 const char *username, *id, *object_path, *runtime_path, *service = NULL, *tty = NULL, *display = NULL, *remote_user = NULL, *remote_host = NULL, *seat = NULL, *type;
310 char **controllers = NULL, **reset_controllers = NULL, **kill_only_users = NULL, **kill_exclude_users = NULL;
313 DBusMessageIter iter;
316 DBusConnection *bus = NULL;
317 DBusMessage *m = NULL, *reply = NULL;
323 dbus_error_init(&error);
325 /* pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); */
327 /* Make this a NOP on non-systemd systems */
328 if (sd_booted() <= 0)
331 if (parse_argv(handle,
333 &controllers, &reset_controllers,
334 &kill_processes, &kill_only_users, &kill_exclude_users,
340 r = get_user_data(handle, &username, &pw);
341 if (r != PAM_SUCCESS)
345 kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);
347 dbus_connection_set_change_sigpipe(FALSE);
349 bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
351 pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
356 m = dbus_message_new_method_call(
357 "org.freedesktop.login1",
358 "/org/freedesktop/login1",
359 "org.freedesktop.login1.Manager",
363 pam_syslog(handle, LOG_ERR, "Could not allocate create session message.");
371 pam_get_item(handle, PAM_SERVICE, (const void**) &service);
372 pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
373 pam_get_item(handle, PAM_TTY, (const void**) &tty);
374 pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
375 pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
376 seat = pam_getenv(handle, "XDG_SEAT");
378 service = strempty(service);
380 display = strempty(display);
381 remote_user = strempty(remote_user);
382 remote_host = strempty(remote_host);
383 seat = strempty(seat);
385 if (strchr(tty, ':')) {
386 /* A tty with a colon is usually an X11 display, place
387 * there to show up in utmp. We rearrange things and
388 * don't pretend that an X display was a tty */
390 if (isempty(display))
395 type = !isempty(display) ? "x11" :
396 !isempty(tty) ? "tty" : "other";
398 remote = !isempty(remote_host) && !streq(remote_host, "localhost") && !streq(remote_host, "localhost.localdomain");
400 if (!dbus_message_append_args(m,
401 DBUS_TYPE_UINT32, &uid,
402 DBUS_TYPE_UINT32, &pid,
403 DBUS_TYPE_STRING, &service,
404 DBUS_TYPE_STRING, &type,
405 DBUS_TYPE_STRING, &seat,
406 DBUS_TYPE_STRING, &tty,
407 DBUS_TYPE_STRING, &display,
408 DBUS_TYPE_BOOLEAN, &remote,
409 DBUS_TYPE_STRING, &remote_user,
410 DBUS_TYPE_STRING, &remote_host,
411 DBUS_TYPE_INVALID)) {
412 pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
417 dbus_message_iter_init_append(m, &iter);
419 r = bus_append_strv_iter(&iter, controllers);
421 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
426 r = bus_append_strv_iter(&iter, reset_controllers);
428 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
434 if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &kp)) {
435 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
440 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
442 pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error));
447 if (!dbus_message_get_args(reply, &error,
448 DBUS_TYPE_STRING, &id,
449 DBUS_TYPE_OBJECT_PATH, &object_path,
450 DBUS_TYPE_STRING, &runtime_path,
451 DBUS_TYPE_UNIX_FD, &session_fd,
452 DBUS_TYPE_INVALID)) {
453 pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", bus_error_message(&error));
458 r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0);
459 if (r != PAM_SUCCESS) {
460 pam_syslog(handle, LOG_ERR, "Failed to set session id.");
464 r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0);
465 if (r != PAM_SUCCESS) {
466 pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
470 if (session_fd >= 0) {
471 r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL);
472 if (r != PAM_SUCCESS) {
473 pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
483 strv_free(controllers);
484 strv_free(reset_controllers);
485 strv_free(kill_only_users);
486 strv_free(kill_exclude_users);
488 dbus_error_free(&error);
491 dbus_connection_close(bus);
492 dbus_connection_unref(bus);
496 dbus_message_unref(m);
499 dbus_message_unref(reply);
502 close_nointr_nofail(session_fd);
507 _public_ PAM_EXTERN int pam_sm_close_session(
508 pam_handle_t *handle,
510 int argc, const char **argv) {
512 const void *p = NULL;
514 pam_get_data(handle, "systemd.session-fd", &p);
517 close_nointr(PTR_TO_INT(p) - 1);