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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include <sys/capability.h>
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#include <security/pam_modules.h>
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#include <security/_pam_macros.h>
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#include <security/pam_modutil.h>
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#include <security/pam_ext.h>
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#include <security/pam_misc.h>
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#include "sd-daemon.h"
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#include "dbus-common.h"
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#include "socket-util.h"
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static int parse_argv(pam_handle_t *handle,
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int argc, const char **argv,
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char ***reset_controllers,
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char ***kill_only_users,
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char ***kill_exclude_users,
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assert(argc == 0 || argv);
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for (i = 0; i < (unsigned) argc; i++) {
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if (startswith(argv[i], "kill-session-processes=")) {
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if ((k = parse_boolean(argv[i] + 23)) < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to parse kill-session-processes= argument.");
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} else if (startswith(argv[i], "kill-session=")) {
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/* As compatibility for old versions */
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if ((k = parse_boolean(argv[i] + 13)) < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument.");
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} else if (startswith(argv[i], "controllers=")) {
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if (!(l = strv_split(argv[i] + 12, ","))) {
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pam_syslog(handle, LOG_ERR, "Out of memory.");
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strv_free(*controllers);
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} else if (startswith(argv[i], "reset-controllers=")) {
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if (reset_controllers) {
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if (!(l = strv_split(argv[i] + 18, ","))) {
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pam_syslog(handle, LOG_ERR, "Out of memory.");
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strv_free(*reset_controllers);
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*reset_controllers = l;
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} else if (startswith(argv[i], "kill-only-users=")) {
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if (kill_only_users) {
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if (!(l = strv_split(argv[i] + 16, ","))) {
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pam_syslog(handle, LOG_ERR, "Out of memory.");
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strv_free(*kill_only_users);
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*kill_only_users = l;
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} else if (startswith(argv[i], "kill-exclude-users=")) {
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if (kill_exclude_users) {
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if (!(l = strv_split(argv[i] + 19, ","))) {
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pam_syslog(handle, LOG_ERR, "Out of memory.");
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strv_free(*kill_exclude_users);
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*kill_exclude_users = l;
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} else if (startswith(argv[i], "debug=")) {
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if ((k = parse_boolean(argv[i] + 6)) < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to parse debug= argument.");
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} else if (startswith(argv[i], "create-session=") ||
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startswith(argv[i], "kill-user=")) {
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pam_syslog(handle, LOG_WARNING, "Option %s not supported anymore, ignoring.", argv[i]);
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pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
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static int get_user_data(
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pam_handle_t *handle,
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const char **ret_username,
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struct passwd **ret_pw) {
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const char *username = NULL;
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struct passwd *pw = NULL;
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bool have_loginuid = false;
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assert(ret_username);
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if (have_effective_cap(CAP_AUDIT_CONTROL) > 0) {
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/* Only use audit login uid if we are executed with
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* sufficient capabilities so that pam_loginuid could
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* do its job. If we are lacking the CAP_AUDIT_CONTROL
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* capabality we most likely are being run in a
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* container and /proc/self/loginuid is useless since
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* it probably contains a uid of the host system. */
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if (read_one_line_file("/proc/self/loginuid", &s) >= 0) {
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r = parse_uid(s, &uid);
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if (r >= 0 && uid != (uint32_t) -1) {
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have_loginuid = true;
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pw = pam_modutil_getpwuid(handle, uid);
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if (!have_loginuid) {
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if ((r = pam_get_user(handle, &username, NULL)) != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to get user name.");
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if (!username || !*username) {
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pam_syslog(handle, LOG_ERR, "User name not valid.");
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pw = pam_modutil_getpwnam(handle, username);
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pam_syslog(handle, LOG_ERR, "Failed to get user data.");
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return PAM_USER_UNKNOWN;
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*ret_username = username ? username : pw->pw_name;
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static bool check_user_lists(
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pam_handle_t *handle,
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char **kill_only_users,
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char **kill_exclude_users) {
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const char *name = NULL;
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name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
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pw = pam_modutil_getpwuid(handle, uid);
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STRV_FOREACH(l, kill_exclude_users) {
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if (parse_uid(*l, &u) >= 0)
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if (name && streq(name, *l))
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if (strv_isempty(kill_only_users))
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STRV_FOREACH(l, kill_only_users) {
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if (parse_uid(*l, &u) >= 0)
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if (name && streq(name, *l))
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static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) {
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union sockaddr_union sa;
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/* We deduce the X11 socket from the display name, then use
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* SO_PEERCRED to determine the X11 server process, ask for
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* the controlling tty of that and if it's a VC then we know
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* the seat and the virtual terminal. Sounds ugly, is only
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r = socket_from_display(display, &p);
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fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
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sa.un.sun_family = AF_UNIX;
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strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1);
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if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
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close_nointr_nofail(fd);
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r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l);
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close_nointr_nofail(fd);
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r = get_ctty(ucred.pid, NULL, &tty);
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v = vtnr_from_tty(tty);
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*vtnr = (uint32_t) v;
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_public_ PAM_EXTERN int pam_sm_open_session(
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pam_handle_t *handle,
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int argc, const char **argv) {
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bool kill_processes = false, debug = false;
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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;
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char **controllers = NULL, **reset_controllers = NULL, **kill_only_users = NULL, **kill_exclude_users = NULL;
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DBusMessageIter iter;
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DBusConnection *bus = NULL;
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DBusMessage *m = NULL, *reply = NULL;
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dbus_error_init(&error);
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/* pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); */
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/* Make this a NOP on non-systemd systems */
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if (sd_booted() <= 0)
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if (parse_argv(handle,
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&controllers, &reset_controllers,
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&kill_processes, &kill_only_users, &kill_exclude_users,
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r = get_user_data(handle, &username, &pw);
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if (r != PAM_SUCCESS)
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/* Make sure we don't enter a loop by talking to
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* systemd-logind when it is actually waiting for the
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* background to finish start-up. If the service is
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* "systemd-shared" we simply set XDG_RUNTIME_DIR and
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pam_get_item(handle, PAM_SERVICE, (const void**) &service);
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if (streq_ptr(service, "systemd-shared")) {
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if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) pw->pw_uid) < 0) {
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r = parse_env_file(p, NEWLINE,
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if (r < 0 && r != -ENOENT) {
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r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
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kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);
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dbus_connection_set_change_sigpipe(FALSE);
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bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
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pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
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m = dbus_message_new_method_call(
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"org.freedesktop.login1",
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"/org/freedesktop/login1",
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"org.freedesktop.login1.Manager",
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pam_syslog(handle, LOG_ERR, "Could not allocate create session message.");
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pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
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pam_get_item(handle, PAM_TTY, (const void**) &tty);
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pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
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pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
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seat = pam_getenv(handle, "XDG_SEAT");
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cvtnr = pam_getenv(handle, "XDG_VTNR");
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service = strempty(service);
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display = strempty(display);
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remote_user = strempty(remote_user);
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remote_host = strempty(remote_host);
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seat = strempty(seat);
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if (strchr(tty, ':')) {
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/* A tty with a colon is usually an X11 display, place
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* there to show up in utmp. We rearrange things and
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* don't pretend that an X display was a tty */
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if (isempty(display))
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safe_atou32(cvtnr, &vtnr);
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if (!isempty(display) && isempty(seat) && vtnr <= 0)
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get_seat_from_display(display, &seat, &vtnr);
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type = !isempty(display) ? "x11" :
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!isempty(tty) ? "tty" : "other";
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remote = !isempty(remote_host) && !streq(remote_host, "localhost") && !streq(remote_host, "localhost.localdomain");
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if (!dbus_message_append_args(m,
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DBUS_TYPE_UINT32, &uid,
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DBUS_TYPE_UINT32, &pid,
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DBUS_TYPE_STRING, &service,
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DBUS_TYPE_STRING, &type,
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DBUS_TYPE_STRING, &seat,
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DBUS_TYPE_UINT32, &vtnr,
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DBUS_TYPE_STRING, &tty,
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DBUS_TYPE_STRING, &display,
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DBUS_TYPE_BOOLEAN, &remote,
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DBUS_TYPE_STRING, &remote_user,
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DBUS_TYPE_STRING, &remote_host,
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DBUS_TYPE_INVALID)) {
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pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
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dbus_message_iter_init_append(m, &iter);
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r = bus_append_strv_iter(&iter, controllers);
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pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
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r = bus_append_strv_iter(&iter, reset_controllers);
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pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
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if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &kp)) {
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pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
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pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error));
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_STRING, &id,
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DBUS_TYPE_OBJECT_PATH, &object_path,
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DBUS_TYPE_STRING, &runtime_path,
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DBUS_TYPE_UNIX_FD, &session_fd,
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DBUS_TYPE_STRING, &seat,
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DBUS_TYPE_UINT32, &vtnr,
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DBUS_TYPE_INVALID)) {
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pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", bus_error_message(&error));
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r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to set session id.");
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r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
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if (!isempty(seat)) {
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r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to set seat.");
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snprintf(buf, sizeof(buf), "%u", vtnr);
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r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number.");
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if (session_fd >= 0) {
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r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL);
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if (r != PAM_SUCCESS) {
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pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
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strv_free(controllers);
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strv_free(reset_controllers);
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strv_free(kill_only_users);
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strv_free(kill_exclude_users);
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dbus_error_free(&error);
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dbus_connection_close(bus);
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dbus_connection_unref(bus);
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dbus_message_unref(m);
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dbus_message_unref(reply);
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close_nointr_nofail(session_fd);
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_public_ PAM_EXTERN int pam_sm_close_session(
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pam_handle_t *handle,
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int argc, const char **argv) {
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const void *p = NULL;
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pam_get_data(handle, "systemd.session-fd", &p);
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close_nointr(PTR_TO_INT(p) - 1);
added
removed
src/pam-module.c
