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"
41 #include "socket-util.h"
43 static int parse_argv(pam_handle_t *handle,
44 int argc, const char **argv,
46 char ***reset_controllers,
48 char ***kill_only_users,
49 char ***kill_exclude_users,
55 assert(argc == 0 || argv);
57 for (i = 0; i < (unsigned) argc; i++) {
60 if (startswith(argv[i], "kill-session-processes=")) {
61 if ((k = parse_boolean(argv[i] + 23)) < 0) {
62 pam_syslog(handle, LOG_ERR, "Failed to parse kill-session-processes= argument.");
69 } else if (startswith(argv[i], "kill-session=")) {
70 /* As compatibility for old versions */
72 if ((k = parse_boolean(argv[i] + 13)) < 0) {
73 pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument.");
80 } else if (startswith(argv[i], "controllers=")) {
85 if (!(l = strv_split(argv[i] + 12, ","))) {
86 pam_syslog(handle, LOG_ERR, "Out of memory.");
90 strv_free(*controllers);
94 } else if (startswith(argv[i], "reset-controllers=")) {
96 if (reset_controllers) {
99 if (!(l = strv_split(argv[i] + 18, ","))) {
100 pam_syslog(handle, LOG_ERR, "Out of memory.");
104 strv_free(*reset_controllers);
105 *reset_controllers = l;
108 } else if (startswith(argv[i], "kill-only-users=")) {
110 if (kill_only_users) {
113 if (!(l = strv_split(argv[i] + 16, ","))) {
114 pam_syslog(handle, LOG_ERR, "Out of memory.");
118 strv_free(*kill_only_users);
119 *kill_only_users = l;
122 } else if (startswith(argv[i], "kill-exclude-users=")) {
124 if (kill_exclude_users) {
127 if (!(l = strv_split(argv[i] + 19, ","))) {
128 pam_syslog(handle, LOG_ERR, "Out of memory.");
132 strv_free(*kill_exclude_users);
133 *kill_exclude_users = l;
136 } else if (startswith(argv[i], "debug=")) {
137 if ((k = parse_boolean(argv[i] + 6)) < 0) {
138 pam_syslog(handle, LOG_ERR, "Failed to parse debug= argument.");
145 } else if (startswith(argv[i], "create-session=") ||
146 startswith(argv[i], "kill-user=")) {
148 pam_syslog(handle, LOG_WARNING, "Option %s not supported anymore, ignoring.", argv[i]);
151 pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
159 static int get_user_data(
160 pam_handle_t *handle,
161 const char **ret_username,
162 struct passwd **ret_pw) {
164 const char *username = NULL;
165 struct passwd *pw = NULL;
167 bool have_loginuid = false;
171 assert(ret_username);
174 if (have_effective_cap(CAP_AUDIT_CONTROL) > 0) {
175 /* Only use audit login uid if we are executed with
176 * sufficient capabilities so that pam_loginuid could
177 * do its job. If we are lacking the CAP_AUDIT_CONTROL
178 * capabality we most likely are being run in a
179 * container and /proc/self/loginuid is useless since
180 * it probably contains a uid of the host system. */
182 if (read_one_line_file("/proc/self/loginuid", &s) >= 0) {
185 r = safe_atou32(s, &u);
188 if (r >= 0 && u != (uint32_t) -1 && u > 0) {
189 have_loginuid = true;
190 pw = pam_modutil_getpwuid(handle, u);
195 if (!have_loginuid) {
196 if ((r = pam_get_user(handle, &username, NULL)) != PAM_SUCCESS) {
197 pam_syslog(handle, LOG_ERR, "Failed to get user name.");
201 if (!username || !*username) {
202 pam_syslog(handle, LOG_ERR, "User name not valid.");
206 pw = pam_modutil_getpwnam(handle, username);
210 pam_syslog(handle, LOG_ERR, "Failed to get user data.");
211 return PAM_USER_UNKNOWN;
215 *ret_username = username ? username : pw->pw_name;
220 static bool check_user_lists(
221 pam_handle_t *handle,
223 char **kill_only_users,
224 char **kill_exclude_users) {
226 const char *name = NULL;
232 name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
236 pw = pam_modutil_getpwuid(handle, uid);
241 STRV_FOREACH(l, kill_exclude_users) {
244 if (safe_atou32(*l, &id) >= 0)
245 if ((uid_t) id == uid)
248 if (name && streq(name, *l))
252 if (strv_isempty(kill_only_users))
255 STRV_FOREACH(l, kill_only_users) {
258 if (safe_atou32(*l, &id) >= 0)
259 if ((uid_t) id == uid)
262 if (name && streq(name, *l))
269 static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) {
273 union sockaddr_union sa;
283 /* We deduce the X11 socket from the display name, then use
284 * SO_PEERCRED to determine the X11 server process, ask for
285 * the controlling tty of that and if it's a VC then we know
286 * the seat and the virtual terminal. Sounds ugly, is only
289 r = socket_from_display(display, &p);
293 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
300 sa.un.sun_family = AF_UNIX;
301 strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1);
304 if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
305 close_nointr_nofail(fd);
310 r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l);
311 close_nointr_nofail(fd);
316 r = get_ctty(ucred.pid, NULL, &tty);
320 v = vtnr_from_tty(tty);
329 *vtnr = (uint32_t) v;
334 _public_ PAM_EXTERN int pam_sm_open_session(
335 pam_handle_t *handle,
337 int argc, const char **argv) {
340 bool kill_processes = false, debug = false;
341 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;
342 char **controllers = NULL, **reset_controllers = NULL, **kill_only_users = NULL, **kill_exclude_users = NULL;
345 DBusMessageIter iter;
348 DBusConnection *bus = NULL;
349 DBusMessage *m = NULL, *reply = NULL;
356 dbus_error_init(&error);
358 /* pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); */
360 /* Make this a NOP on non-systemd systems */
361 if (sd_booted() <= 0)
364 if (parse_argv(handle,
366 &controllers, &reset_controllers,
367 &kill_processes, &kill_only_users, &kill_exclude_users,
373 r = get_user_data(handle, &username, &pw);
374 if (r != PAM_SUCCESS)
378 kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);
380 dbus_connection_set_change_sigpipe(FALSE);
382 bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
384 pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
389 m = dbus_message_new_method_call(
390 "org.freedesktop.login1",
391 "/org/freedesktop/login1",
392 "org.freedesktop.login1.Manager",
396 pam_syslog(handle, LOG_ERR, "Could not allocate create session message.");
404 pam_get_item(handle, PAM_SERVICE, (const void**) &service);
405 pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
406 pam_get_item(handle, PAM_TTY, (const void**) &tty);
407 pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
408 pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
409 seat = pam_getenv(handle, "LOGIN_SEAT");
410 cvtnr = pam_getenv(handle, "LOGIN_VTNR");
412 service = strempty(service);
414 display = strempty(display);
415 remote_user = strempty(remote_user);
416 remote_host = strempty(remote_host);
417 seat = strempty(seat);
419 if (strchr(tty, ':')) {
420 /* A tty with a colon is usually an X11 display, place
421 * there to show up in utmp. We rearrange things and
422 * don't pretend that an X display was a tty */
424 if (isempty(display))
430 safe_atou32(cvtnr, &vtnr);
432 if (!isempty(display) && isempty(seat) && vtnr <= 0)
433 get_seat_from_display(display, &seat, &vtnr);
435 type = !isempty(display) ? "x11" :
436 !isempty(tty) ? "tty" : "other";
438 remote = !isempty(remote_host) && !streq(remote_host, "localhost") && !streq(remote_host, "localhost.localdomain");
440 if (!dbus_message_append_args(m,
441 DBUS_TYPE_UINT32, &uid,
442 DBUS_TYPE_UINT32, &pid,
443 DBUS_TYPE_STRING, &service,
444 DBUS_TYPE_STRING, &type,
445 DBUS_TYPE_STRING, &seat,
446 DBUS_TYPE_UINT32, &vtnr,
447 DBUS_TYPE_STRING, &tty,
448 DBUS_TYPE_STRING, &display,
449 DBUS_TYPE_BOOLEAN, &remote,
450 DBUS_TYPE_STRING, &remote_user,
451 DBUS_TYPE_STRING, &remote_host,
452 DBUS_TYPE_INVALID)) {
453 pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
458 dbus_message_iter_init_append(m, &iter);
460 r = bus_append_strv_iter(&iter, controllers);
462 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
467 r = bus_append_strv_iter(&iter, reset_controllers);
469 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
475 if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &kp)) {
476 pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
481 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
483 pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error));
488 if (!dbus_message_get_args(reply, &error,
489 DBUS_TYPE_STRING, &id,
490 DBUS_TYPE_OBJECT_PATH, &object_path,
491 DBUS_TYPE_STRING, &runtime_path,
492 DBUS_TYPE_UNIX_FD, &session_fd,
493 DBUS_TYPE_INVALID)) {
494 pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", bus_error_message(&error));
499 r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0);
500 if (r != PAM_SUCCESS) {
501 pam_syslog(handle, LOG_ERR, "Failed to set session id.");
505 r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0);
506 if (r != PAM_SUCCESS) {
507 pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
511 if (session_fd >= 0) {
512 r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL);
513 if (r != PAM_SUCCESS) {
514 pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
524 strv_free(controllers);
525 strv_free(reset_controllers);
526 strv_free(kill_only_users);
527 strv_free(kill_exclude_users);
529 dbus_error_free(&error);
532 dbus_connection_close(bus);
533 dbus_connection_unref(bus);
537 dbus_message_unref(m);
540 dbus_message_unref(reply);
543 close_nointr_nofail(session_fd);
548 _public_ PAM_EXTERN int pam_sm_close_session(
549 pam_handle_t *handle,
551 int argc, const char **argv) {
553 const void *p = NULL;
555 pam_get_data(handle, "systemd.session-fd", &p);
558 close_nointr(PTR_TO_INT(p) - 1);