[thirdparty/systemd.git] / src / login / pam-module.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 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
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <errno.h>
#include <fcntl.h>
#include <sys/file.h>
#include <pwd.h>
#include <endian.h>
#include <sys/capability.h>

#include <security/pam_modules.h>
#include <security/_pam_macros.h>
#include <security/pam_modutil.h>
#include <security/pam_ext.h>
#include <security/pam_misc.h>

#include <systemd/sd-daemon.h>

#include "util.h"
#include "audit.h"
#include "macro.h"
#include "strv.h"
#include "dbus-common.h"
#include "def.h"
#include "socket-util.h"

static int parse_argv(pam_handle_t *handle,
                      int argc, const char **argv,
                      char ***controllers,
                      char ***reset_controllers,
                      bool *kill_processes,
                      char ***kill_only_users,
                      char ***kill_exclude_users,
                      bool *debug) {

        unsigned i;

        assert(argc >= 0);
        assert(argc == 0 || argv);

        for (i = 0; i < (unsigned) argc; i++) {
                int k;

                if (startswith(argv[i], "kill-session-processes=")) {
                        if ((k = parse_boolean(argv[i] + 23)) < 0) {
                                pam_syslog(handle, LOG_ERR, "Failed to parse kill-session-processes= argument.");
                                return k;
                        }

                        if (kill_processes)
                                *kill_processes = k;

                } else if (startswith(argv[i], "kill-session=")) {
                        /* As compatibility for old versions */

                        if ((k = parse_boolean(argv[i] + 13)) < 0) {
                                pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument.");
                                return k;
                        }

                        if (kill_processes)
                                *kill_processes = k;

                } else if (startswith(argv[i], "controllers=")) {

                        if (controllers) {
                                char **l;

                                if (!(l = strv_split(argv[i] + 12, ","))) {
                                        pam_syslog(handle, LOG_ERR, "Out of memory.");
                                        return -ENOMEM;
                                }

                                strv_free(*controllers);
                                *controllers = l;
                        }

                } else if (startswith(argv[i], "reset-controllers=")) {

                        if (reset_controllers) {
                                char **l;

                                if (!(l = strv_split(argv[i] + 18, ","))) {
                                        pam_syslog(handle, LOG_ERR, "Out of memory.");
                                        return -ENOMEM;
                                }

                                strv_free(*reset_controllers);
                                *reset_controllers = l;
                        }

                } else if (startswith(argv[i], "kill-only-users=")) {

                        if (kill_only_users) {
                                char **l;

                                if (!(l = strv_split(argv[i] + 16, ","))) {
                                        pam_syslog(handle, LOG_ERR, "Out of memory.");
                                        return -ENOMEM;
                                }

                                strv_free(*kill_only_users);
                                *kill_only_users = l;
                        }

                } else if (startswith(argv[i], "kill-exclude-users=")) {

                        if (kill_exclude_users) {
                                char **l;

                                if (!(l = strv_split(argv[i] + 19, ","))) {
                                        pam_syslog(handle, LOG_ERR, "Out of memory.");
                                        return -ENOMEM;
                                }

                                strv_free(*kill_exclude_users);
                                *kill_exclude_users = l;
                        }

                } else if (startswith(argv[i], "debug=")) {
                        if ((k = parse_boolean(argv[i] + 6)) < 0) {
                                pam_syslog(handle, LOG_ERR, "Failed to parse debug= argument.");
                                return k;
                        }

                        if (debug)
                                *debug = k;

                } else if (startswith(argv[i], "create-session=") ||
                           startswith(argv[i], "kill-user=")) {

                        pam_syslog(handle, LOG_WARNING, "Option %s not supported anymore, ignoring.", argv[i]);

                } else {
                        pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
                        return -EINVAL;
                }
        }

        return 0;
}

static int get_user_data(
                pam_handle_t *handle,
                const char **ret_username,
                struct passwd **ret_pw) {

        const char *username = NULL;
        struct passwd *pw = NULL;
        uid_t uid;
        int r;

        assert(handle);
        assert(ret_username);
        assert(ret_pw);

        r = audit_loginuid_from_pid(0, &uid);
        if (r >= 0)
                pw = pam_modutil_getpwuid(handle, uid);
        else {
                r = pam_get_user(handle, &username, NULL);
                if (r != PAM_SUCCESS) {
                        pam_syslog(handle, LOG_ERR, "Failed to get user name.");
                        return r;
                }

                if (isempty(username)) {
                        pam_syslog(handle, LOG_ERR, "User name not valid.");
                        return PAM_AUTH_ERR;
                }

                pw = pam_modutil_getpwnam(handle, username);
        }

        if (!pw) {
                pam_syslog(handle, LOG_ERR, "Failed to get user data.");
                return PAM_USER_UNKNOWN;
        }

        *ret_pw = pw;
        *ret_username = username ? username : pw->pw_name;

        return PAM_SUCCESS;
}

static bool check_user_lists(
                pam_handle_t *handle,
                uid_t uid,
                char **kill_only_users,
                char **kill_exclude_users) {

        const char *name = NULL;
        char **l;

        assert(handle);

        if (uid == 0)
                name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
        else {
                struct passwd *pw;

                pw = pam_modutil_getpwuid(handle, uid);
                if (pw)
                        name = pw->pw_name;
        }

        STRV_FOREACH(l, kill_exclude_users) {
                uid_t u;

                if (parse_uid(*l, &u) >= 0)
                        if (u == uid)
                                return false;

                if (name && streq(name, *l))
                        return false;
        }

        if (strv_isempty(kill_only_users))
                return true;

        STRV_FOREACH(l, kill_only_users) {
                uid_t u;

                if (parse_uid(*l, &u) >= 0)
                        if (u == uid)
                                return true;

                if (name && streq(name, *l))
                        return true;
        }

        return false;
}

static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) {
        char *p = NULL;
        int r;
        int fd;
        union sockaddr_union sa;
        struct ucred ucred;
        socklen_t l;
        char *tty;
        int v;

        assert(display);
        assert(vtnr);

        /* We deduce the X11 socket from the display name, then use
         * SO_PEERCRED to determine the X11 server process, ask for
         * the controlling tty of that and if it's a VC then we know
         * the seat and the virtual terminal. Sounds ugly, is only
         * semi-ugly. */

        r = socket_from_display(display, &p);
        if (r < 0)
                return r;

        fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
        if (fd < 0) {
                free(p);
                return -errno;
        }

        zero(sa);
        sa.un.sun_family = AF_UNIX;
        strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1);
        free(p);

        if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
                close_nointr_nofail(fd);
                return -errno;
        }

        l = sizeof(ucred);
        r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l);
        close_nointr_nofail(fd);

        if (r < 0)
                return -errno;

        r = get_ctty(ucred.pid, NULL, &tty);
        if (r < 0)
                return r;

        v = vtnr_from_tty(tty);
        free(tty);

        if (v < 0)
                return v;
        else if (v == 0)
                return -ENOENT;

        if (seat)
                *seat = "seat0";
        *vtnr = (uint32_t) v;

        return 0;
}

_public_ PAM_EXTERN int pam_sm_open_session(
                pam_handle_t *handle,
                int flags,
                int argc, const char **argv) {

        struct passwd *pw;
        bool kill_processes = false, debug = false;
        const char *username, *id, *object_path, *runtime_path, *service = NULL, *tty = NULL, *display = NULL, *remote_user = NULL, *remote_host = NULL, *seat = NULL, *type, *class, *cvtnr = NULL;
        char **controllers = NULL, **reset_controllers = NULL, **kill_only_users = NULL, **kill_exclude_users = NULL;
        DBusError error;
        uint32_t uid, pid;
        DBusMessageIter iter;
        dbus_bool_t kp;
        int session_fd = -1;
        DBusConnection *bus = NULL;
        DBusMessage *m = NULL, *reply = NULL;
        dbus_bool_t remote;
        int r;
        uint32_t vtnr = 0;

        assert(handle);

        dbus_error_init(&error);

        /* pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); */

        /* Make this a NOP on non-systemd systems */
        if (sd_booted() <= 0)
                return PAM_SUCCESS;

        if (parse_argv(handle,
                       argc, argv,
                       &controllers, &reset_controllers,
                       &kill_processes, &kill_only_users, &kill_exclude_users,
                       &debug) < 0) {
                r = PAM_SESSION_ERR;
                goto finish;
        }

        r = get_user_data(handle, &username, &pw);
        if (r != PAM_SUCCESS)
                goto finish;

        /* Make sure we don't enter a loop by talking to
         * systemd-logind when it is actually waiting for the
         * background to finish start-up. If the service is
         * "systemd-shared" we simply set XDG_RUNTIME_DIR and
         * leave. */

        pam_get_item(handle, PAM_SERVICE, (const void**) &service);
        if (streq_ptr(service, "systemd-shared")) {
                char *p, *rt = NULL;

                if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) pw->pw_uid) < 0) {
                        r = PAM_BUF_ERR;
                        goto finish;
                }

                r = parse_env_file(p, NEWLINE,
                                   "RUNTIME", &rt,
                                   NULL);
                free(p);

                if (r < 0 && r != -ENOENT) {
                        r = PAM_SESSION_ERR;
                        free(rt);
                        goto finish;
                }

                if (rt)  {
                        r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0);
                        free(rt);

                        if (r != PAM_SUCCESS) {
                                pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
                                goto finish;
                        }
                }

                r = PAM_SUCCESS;
                goto finish;
        }

        if (kill_processes)
                kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);

        dbus_connection_set_change_sigpipe(FALSE);

        bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
        if (!bus) {
                pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
                r = PAM_SESSION_ERR;
                goto finish;
        }

        m = dbus_message_new_method_call(
                        "org.freedesktop.login1",
                        "/org/freedesktop/login1",
                        "org.freedesktop.login1.Manager",
                        "CreateSession");
        if (!m) {
                pam_syslog(handle, LOG_ERR, "Could not allocate create session message.");
                r = PAM_BUF_ERR;
                goto finish;
        }

        uid = pw->pw_uid;
        pid = getpid();

        pam_get_item(handle, PAM_XDISPLAY, (const void**) &display);
        pam_get_item(handle, PAM_TTY, (const void**) &tty);
        pam_get_item(handle, PAM_RUSER, (const void**) &remote_user);
        pam_get_item(handle, PAM_RHOST, (const void**) &remote_host);
        seat = pam_getenv(handle, "XDG_SEAT");
        cvtnr = pam_getenv(handle, "XDG_VTNR");

        service = strempty(service);
        tty = strempty(tty);
        display = strempty(display);
        remote_user = strempty(remote_user);
        remote_host = strempty(remote_host);
        seat = strempty(seat);

        if (strchr(tty, ':')) {
                /* A tty with a colon is usually an X11 display, place
                 * there to show up in utmp. We rearrange things and
                 * don't pretend that an X display was a tty */

                if (isempty(display))
                        display = tty;
                tty = "";
        } else if (streq(tty, "cron")) {
                /* cron has been setting PAM_TTY to "cron" for a very long time
                 * and it cannot stop doing that for compatibility reasons. */
                tty = "";
        }

        if (!isempty(cvtnr))
                safe_atou32(cvtnr, &vtnr);

        if (!isempty(display) && vtnr <= 0) {
                if (isempty(seat))
                        get_seat_from_display(display, &seat, &vtnr);
                else if (streq(seat, "seat0"))
                        get_seat_from_display(display, NULL, &vtnr);
        }

        type = !isempty(display) ? "x11" :
                   !isempty(tty) ? "tty" : "unspecified";

        class = pam_getenv(handle, "XDG_SESSION_CLASS");
        if (isempty(class))
                class = "user";

        remote = !isempty(remote_host) &&
                !streq(remote_host, "localhost") &&
                !streq(remote_host, "localhost.localdomain");

        if (!dbus_message_append_args(m,
                                      DBUS_TYPE_UINT32, &uid,
                                      DBUS_TYPE_UINT32, &pid,
                                      DBUS_TYPE_STRING, &service,
                                      DBUS_TYPE_STRING, &type,
                                      DBUS_TYPE_STRING, &class,
                                      DBUS_TYPE_STRING, &seat,
                                      DBUS_TYPE_UINT32, &vtnr,
                                      DBUS_TYPE_STRING, &tty,
                                      DBUS_TYPE_STRING, &display,
                                      DBUS_TYPE_BOOLEAN, &remote,
                                      DBUS_TYPE_STRING, &remote_user,
                                      DBUS_TYPE_STRING, &remote_host,
                                      DBUS_TYPE_INVALID)) {
                pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
                r = PAM_BUF_ERR;
                goto finish;
        }

        dbus_message_iter_init_append(m, &iter);

        r = bus_append_strv_iter(&iter, controllers);
        if (r < 0) {
                pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
                r = PAM_BUF_ERR;
                goto finish;
        }

        r = bus_append_strv_iter(&iter, reset_controllers);
        if (r < 0) {
                pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
                r = PAM_BUF_ERR;
                goto finish;
        }

        kp = kill_processes;
        if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &kp)) {
                pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
                r = PAM_BUF_ERR;
                goto finish;
        }

        if (debug)
                pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: "
                           "uid=%u pid=%u service=%s type=%s seat=%s vtnr=%u tty=%s display=%s remote=%s remote_user=%s remote_host=%s",
                           uid, pid, service, type, seat, vtnr, tty, display, yes_no(remote), remote_user, remote_host);

        reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
        if (!reply) {
                pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error));
                r = PAM_SESSION_ERR;
                goto finish;
        }

        if (!dbus_message_get_args(reply, &error,
                                   DBUS_TYPE_STRING, &id,
                                   DBUS_TYPE_OBJECT_PATH, &object_path,
                                   DBUS_TYPE_STRING, &runtime_path,
                                   DBUS_TYPE_UNIX_FD, &session_fd,
                                   DBUS_TYPE_STRING, &seat,
                                   DBUS_TYPE_UINT32, &vtnr,
                                   DBUS_TYPE_INVALID)) {
                pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", bus_error_message(&error));
                r = PAM_SESSION_ERR;
                goto finish;
        }

        if (debug)
                pam_syslog(handle, LOG_DEBUG, "Reply from logind: "
                           "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u",
                           id, object_path, runtime_path, session_fd, seat, vtnr);

        r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0);
        if (r != PAM_SUCCESS) {
                pam_syslog(handle, LOG_ERR, "Failed to set session id.");
                goto finish;
        }

        r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0);
        if (r != PAM_SUCCESS) {
                pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
                goto finish;
        }

        if (!isempty(seat)) {
                r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0);
                if (r != PAM_SUCCESS) {
                        pam_syslog(handle, LOG_ERR, "Failed to set seat.");
                        goto finish;
                }
        }

        if (vtnr > 0) {
                char buf[11];
                snprintf(buf, sizeof(buf), "%u", vtnr);
                char_array_0(buf);

                r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0);
                if (r != PAM_SUCCESS) {
                        pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number.");
                        goto finish;
                }
        }

        if (session_fd >= 0) {
                r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL);
                if (r != PAM_SUCCESS) {
                        pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
                        return r;
                }
        }

        session_fd = -1;

        r = PAM_SUCCESS;

finish:
        strv_free(controllers);
        strv_free(reset_controllers);
        strv_free(kill_only_users);
        strv_free(kill_exclude_users);

        dbus_error_free(&error);

        if (bus) {
                dbus_connection_close(bus);
                dbus_connection_unref(bus);
        }

        if (m)
                dbus_message_unref(m);

        if (reply)
                dbus_message_unref(reply);

        if (session_fd >= 0)
                close_nointr_nofail(session_fd);

        return r;
}

_public_ PAM_EXTERN int pam_sm_close_session(
                pam_handle_t *handle,
                int flags,
                int argc, const char **argv) {

        const void *p = NULL;
        const char *id;
        DBusConnection *bus = NULL;
        DBusMessage *m = NULL, *reply = NULL;
        DBusError error;
        int r;

        assert(handle);

        dbus_error_init(&error);

        id = pam_getenv(handle, "XDG_SESSION_ID");
        if (id) {

                /* Before we go and close the FIFO we need to tell
                 * logind that this is a clean session shutdown, so
                 * that it doesn't just go and slaughter us
                 * immediately after closing the fd */

                bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
                if (!bus) {
                        pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
                        r = PAM_SESSION_ERR;
                        goto finish;
                }

                m = dbus_message_new_method_call(
                                "org.freedesktop.login1",
                                "/org/freedesktop/login1",
                                "org.freedesktop.login1.Manager",
                                "ReleaseSession");
                if (!m) {
                        pam_syslog(handle, LOG_ERR, "Could not allocate release session message.");
                        r = PAM_BUF_ERR;
                        goto finish;
                }

                if (!dbus_message_append_args(m,
                                              DBUS_TYPE_STRING, &id,
                                              DBUS_TYPE_INVALID)) {
                        pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
                        r = PAM_BUF_ERR;
                        goto finish;
                }

                reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
                if (!reply) {
                        pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error));
                        r = PAM_SESSION_ERR;
                        goto finish;
                }
        }

        r = PAM_SUCCESS;

finish:
        pam_get_data(handle, "systemd.session-fd", &p);
        if (p)
                close_nointr(PTR_TO_INT(p) - 1);

        dbus_error_free(&error);

        if (bus) {
                dbus_connection_close(bus);
                dbus_connection_unref(bus);
        }

        if (m)
                dbus_message_unref(m);

        if (reply)
                dbus_message_unref(reply);

        return r;
}
Commit	Line	Data
d6c9574f	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
8c6db833 LP	2
	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	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.
	12
	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.
	17
	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/>.
	20	***/
	21
	22	#include <errno.h>
	23	#include <fcntl.h>
	24	#include <sys/file.h>
	25	#include <pwd.h>
a838e6a1	26	#include <endian.h>
ac123445	27	#include <sys/capability.h>
8c6db833 LP	28
	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>
	34
81527be1 LP	35	#include <systemd/sd-daemon.h>
81527be1 LP	36
8c6db833	37	#include "util.h"
d7832d2c	38	#include "audit.h"
8c6db833	39	#include "macro.h"
74fe1fe3	40	#include "strv.h"
98a28fef LP	41	#include "dbus-common.h"
98a28fef LP	42	#include "def.h"
4d6d6518	43	#include "socket-util.h"
8c6db833 LP	44
	45	static int parse_argv(pam_handle_t *handle,
	46	int argc, const char **argv,
b20c6be6	47	char ***controllers,
e9fbc77c	48	char ***reset_controllers,
98a28fef	49	bool *kill_processes,
e9fbc77c	50	char ***kill_only_users,
0e318cad MS	51	char ***kill_exclude_users,
0e318cad MS	52	bool *debug) {
8c6db833 LP	53
	54	unsigned i;
	55
	56	assert(argc >= 0);
	57	assert(argc == 0 \|\| argv);
	58
	59	for (i = 0; i < (unsigned) argc; i++) {
	60	int k;
	61
c36eecdf LP	62	if (startswith(argv[i], "kill-session-processes=")) {
	63	if ((k = parse_boolean(argv[i] + 23)) < 0) {
	64	pam_syslog(handle, LOG_ERR, "Failed to parse kill-session-processes= argument.");
8c6db833 LP	65	return k;
	66	}
	67
98a28fef LP	68	if (kill_processes)
98a28fef LP	69	*kill_processes = k;
74fe1fe3	70
8c6db833	71	} else if (startswith(argv[i], "kill-session=")) {
98a28fef LP	72	/* As compatibility for old versions */
98a28fef LP	73
8c6db833 LP	74	if ((k = parse_boolean(argv[i] + 13)) < 0) {
	75	pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument.");
	76	return k;
	77	}
	78
98a28fef LP	79	if (kill_processes)
98a28fef LP	80	*kill_processes = k;
74fe1fe3 LP	81
	82	} else if (startswith(argv[i], "controllers=")) {
	83
	84	if (controllers) {
	85	char **l;
	86
	87	if (!(l = strv_split(argv[i] + 12, ","))) {
	88	pam_syslog(handle, LOG_ERR, "Out of memory.");
	89	return -ENOMEM;
	90	}
	91
	92	strv_free(*controllers);
	93	*controllers = l;
	94	}
	95
b20c6be6 LP	96	} else if (startswith(argv[i], "reset-controllers=")) {
	97
	98	if (reset_controllers) {
	99	char **l;
	100
	101	if (!(l = strv_split(argv[i] + 18, ","))) {
	102	pam_syslog(handle, LOG_ERR, "Out of memory.");
	103	return -ENOMEM;
	104	}
	105
	106	strv_free(*reset_controllers);
	107	*reset_controllers = l;
	108	}
	109
e9fbc77c LP	110	} else if (startswith(argv[i], "kill-only-users=")) {
	111
	112	if (kill_only_users) {
	113	char **l;
	114
	115	if (!(l = strv_split(argv[i] + 16, ","))) {
	116	pam_syslog(handle, LOG_ERR, "Out of memory.");
	117	return -ENOMEM;
	118	}
	119
	120	strv_free(*kill_only_users);
	121	*kill_only_users = l;
	122	}
	123
	124	} else if (startswith(argv[i], "kill-exclude-users=")) {
	125
	126	if (kill_exclude_users) {
	127	char **l;
	128
	129	if (!(l = strv_split(argv[i] + 19, ","))) {
	130	pam_syslog(handle, LOG_ERR, "Out of memory.");
	131	return -ENOMEM;
	132	}
	133
	134	strv_free(*kill_exclude_users);
	135	*kill_exclude_users = l;
	136	}
	137
0e318cad MS	138	} else if (startswith(argv[i], "debug=")) {
	139	if ((k = parse_boolean(argv[i] + 6)) < 0) {
	140	pam_syslog(handle, LOG_ERR, "Failed to parse debug= argument.");
	141	return k;
	142	}
	143
	144	if (debug)
	145	*debug = k;
	146
98a28fef LP	147	} else if (startswith(argv[i], "create-session=") \|\|
	148	startswith(argv[i], "kill-user=")) {
	149
	150	pam_syslog(handle, LOG_WARNING, "Option %s not supported anymore, ignoring.", argv[i]);
	151
8c6db833 LP	152	} else {
	153	pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]);
	154	return -EINVAL;
	155	}
	156	}
	157
8c6db833 LP	158	return 0;
	159	}
	160
8c6db833 LP	161	static int get_user_data(
	162	pam_handle_t *handle,
	163	const char **ret_username,
	164	struct passwd **ret_pw) {
	165
d90b9d27 LP	166	const char *username = NULL;
d90b9d27 LP	167	struct passwd *pw = NULL;
87d2c1ff	168	uid_t uid;
8c6db833 LP	169	int r;
	170
	171	assert(handle);
	172	assert(ret_username);
	173	assert(ret_pw);
	174
87d2c1ff LP	175	r = audit_loginuid_from_pid(0, &uid);
	176	if (r >= 0)
	177	pw = pam_modutil_getpwuid(handle, uid);
	178	else {
	179	r = pam_get_user(handle, &username, NULL);
	180	if (r != PAM_SUCCESS) {
d90b9d27 LP	181	pam_syslog(handle, LOG_ERR, "Failed to get user name.");
	182	return r;
	183	}
	184
87d2c1ff	185	if (isempty(username)) {
d90b9d27 LP	186	pam_syslog(handle, LOG_ERR, "User name not valid.");
	187	return PAM_AUTH_ERR;
	188	}
	189
	190	pw = pam_modutil_getpwnam(handle, username);
8c6db833 LP	191	}
8c6db833 LP	192
d90b9d27	193	if (!pw) {
8c6db833 LP	194	pam_syslog(handle, LOG_ERR, "Failed to get user data.");
	195	return PAM_USER_UNKNOWN;
	196	}
	197
	198	*ret_pw = pw;
d90b9d27	199	*ret_username = username ? username : pw->pw_name;
8c6db833 LP	200
	201	return PAM_SUCCESS;
	202	}
	203
e9fbc77c LP	204	static bool check_user_lists(
	205	pam_handle_t *handle,
	206	uid_t uid,
	207	char **kill_only_users,
	208	char **kill_exclude_users) {
	209
	210	const char *name = NULL;
	211	char **l;
	212
	213	assert(handle);
	214
	215	if (uid == 0)
	216	name = "root"; /* Avoid obvious NSS requests, to suppress network traffic */
	217	else {
	218	struct passwd *pw;
	219
98a28fef LP	220	pw = pam_modutil_getpwuid(handle, uid);
98a28fef LP	221	if (pw)
e9fbc77c LP	222	name = pw->pw_name;
	223	}
	224
	225	STRV_FOREACH(l, kill_exclude_users) {
ddd88763	226	uid_t u;
e9fbc77c	227
ddd88763 LP	228	if (parse_uid(*l, &u) >= 0)
ddd88763 LP	229	if (u == uid)
e9fbc77c LP	230	return false;
	231
	232	if (name && streq(name, *l))
	233	return false;
	234	}
	235
	236	if (strv_isempty(kill_only_users))
	237	return true;
	238
	239	STRV_FOREACH(l, kill_only_users) {
ddd88763	240	uid_t u;
e9fbc77c	241
ddd88763 LP	242	if (parse_uid(*l, &u) >= 0)
ddd88763 LP	243	if (u == uid)
e9fbc77c LP	244	return true;
	245
	246	if (name && streq(name, *l))
	247	return true;
	248	}
	249
	250	return false;
	251	}
	252
4d6d6518 LP	253	static int get_seat_from_display(const char display, const char seat, uint32_t vtnr) {
	254	char *p = NULL;
	255	int r;
	256	int fd;
	257	union sockaddr_union sa;
	258	struct ucred ucred;
	259	socklen_t l;
	260	char *tty;
	261	int v;
	262
	263	assert(display);
4d6d6518 LP	264	assert(vtnr);
	265
	266	/* We deduce the X11 socket from the display name, then use
	267	* SO_PEERCRED to determine the X11 server process, ask for
	268	* the controlling tty of that and if it's a VC then we know
	269	* the seat and the virtual terminal. Sounds ugly, is only
	270	* semi-ugly. */
	271
	272	r = socket_from_display(display, &p);
	273	if (r < 0)
	274	return r;
	275
	276	fd = socket(AF_UNIX, SOCK_STREAM\|SOCK_CLOEXEC, 0);
	277	if (fd < 0) {
	278	free(p);
	279	return -errno;
	280	}
	281
	282	zero(sa);
	283	sa.un.sun_family = AF_UNIX;
	284	strncpy(sa.un.sun_path, p, sizeof(sa.un.sun_path)-1);
	285	free(p);
	286
	287	if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
	288	close_nointr_nofail(fd);
	289	return -errno;
	290	}
	291
	292	l = sizeof(ucred);
	293	r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l);
	294	close_nointr_nofail(fd);
	295
	296	if (r < 0)
	297	return -errno;
	298
	299	r = get_ctty(ucred.pid, NULL, &tty);
	300	if (r < 0)
	301	return r;
	302
	303	v = vtnr_from_tty(tty);
	304	free(tty);
	305
	306	if (v < 0)
	307	return v;
	308	else if (v == 0)
	309	return -ENOENT;
	310
fc7985ed LP	311	if (seat)
fc7985ed LP	312	*seat = "seat0";
4d6d6518 LP	313	*vtnr = (uint32_t) v;
	314
	315	return 0;
	316	}
	317
98a28fef	318	_public_ PAM_EXTERN int pam_sm_open_session(
8c6db833 LP	319	pam_handle_t *handle,
	320	int flags,
	321	int argc, const char **argv) {
	322
8c6db833	323	struct passwd *pw;
98a28fef	324	bool kill_processes = false, debug = false;
55efac6c	325	const char username, id, object_path, runtime_path, service = NULL, tty = NULL, display = NULL, remote_user = NULL, remote_host = NULL, seat = NULL, type, class, *cvtnr = NULL;
98a28fef	326	char controllers = NULL, reset_controllers = NULL, kill_only_users = NULL, kill_exclude_users = NULL;
98a28fef LP	327	DBusError error;
	328	uint32_t uid, pid;
	329	DBusMessageIter iter;
	330	dbus_bool_t kp;
98a28fef LP	331	int session_fd = -1;
	332	DBusConnection *bus = NULL;
	333	DBusMessage m = NULL, reply = NULL;
	334	dbus_bool_t remote;
ed18b08b	335	int r;
4d6d6518	336	uint32_t vtnr = 0;
8c6db833 LP	337
	338	assert(handle);
	339
98a28fef LP	340	dbus_error_init(&error);
98a28fef LP	341
ed18b08b	342	/* pam_syslog(handle, LOG_INFO, "pam-systemd initializing"); */
98a28fef	343
8c6db833 LP	344	/* Make this a NOP on non-systemd systems */
	345	if (sd_booted() <= 0)
	346	return PAM_SUCCESS;
	347
e9fbc77c LP	348	if (parse_argv(handle,
e9fbc77c LP	349	argc, argv,
98a28fef LP	350	&controllers, &reset_controllers,
98a28fef LP	351	&kill_processes, &kill_only_users, &kill_exclude_users,
ed18b08b LP	352	&debug) < 0) {
	353	r = PAM_SESSION_ERR;
	354	goto finish;
	355	}
74fe1fe3	356
98a28fef LP	357	r = get_user_data(handle, &username, &pw);
98a28fef LP	358	if (r != PAM_SUCCESS)
8c6db833 LP	359	goto finish;
8c6db833 LP	360
30b2c336 LP	361	/* Make sure we don't enter a loop by talking to
	362	* systemd-logind when it is actually waiting for the
	363	* background to finish start-up. If the service is
	364	* "systemd-shared" we simply set XDG_RUNTIME_DIR and
	365	* leave. */
	366
	367	pam_get_item(handle, PAM_SERVICE, (const void**) &service);
	368	if (streq_ptr(service, "systemd-shared")) {
	369	char p, rt = NULL;
	370
	371	if (asprintf(&p, "/run/systemd/users/%lu", (unsigned long) pw->pw_uid) < 0) {
	372	r = PAM_BUF_ERR;
	373	goto finish;
	374	}
	375
	376	r = parse_env_file(p, NEWLINE,
	377	"RUNTIME", &rt,
	378	NULL);
	379	free(p);
	380
	381	if (r < 0 && r != -ENOENT) {
	382	r = PAM_SESSION_ERR;
	383	free(rt);
	384	goto finish;
	385	}
	386
	387	if (rt) {
	388	r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0);
	389	free(rt);
	390
	391	if (r != PAM_SUCCESS) {
	392	pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
	393	goto finish;
	394	}
	395	}
	396
	397	r = PAM_SUCCESS;
	398	goto finish;
	399	}
	400
98a28fef LP	401	if (kill_processes)
98a28fef LP	402	kill_processes = check_user_lists(handle, pw->pw_uid, kill_only_users, kill_exclude_users);
1f73f0f1	403
ed18b08b LP	404	dbus_connection_set_change_sigpipe(FALSE);
ed18b08b LP	405
98a28fef LP	406	bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
	407	if (!bus) {
	408	pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
	409	r = PAM_SESSION_ERR;
8c6db833 LP	410	goto finish;
	411	}
	412
98a28fef LP	413	m = dbus_message_new_method_call(
	414	"org.freedesktop.login1",
	415	"/org/freedesktop/login1",
	416	"org.freedesktop.login1.Manager",
	417	"CreateSession");
98a28fef LP	418	if (!m) {
98a28fef LP	419	pam_syslog(handle, LOG_ERR, "Could not allocate create session message.");
8c6db833 LP	420	r = PAM_BUF_ERR;
	421	goto finish;
	422	}
	423
98a28fef LP	424	uid = pw->pw_uid;
	425	pid = getpid();
	426
98a28fef LP	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);
bbc73283 LP	431	seat = pam_getenv(handle, "XDG_SEAT");
bbc73283 LP	432	cvtnr = pam_getenv(handle, "XDG_VTNR");
98a28fef	433
ed18b08b LP	434	service = strempty(service);
	435	tty = strempty(tty);
	436	display = strempty(display);
	437	remote_user = strempty(remote_user);
	438	remote_host = strempty(remote_host);
	439	seat = strempty(seat);
98a28fef	440
ee8545b0 LP	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 */
	445
	446	if (isempty(display))
	447	display = tty;
cd58752a	448	tty = "";
1a4459d6 MS	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. */
	452	tty = "";
ee8545b0 LP	453	}
ee8545b0 LP	454
4d6d6518 LP	455	if (!isempty(cvtnr))
	456	safe_atou32(cvtnr, &vtnr);
	457
fc7985ed LP	458	if (!isempty(display) && vtnr <= 0) {
fc7985ed LP	459	if (isempty(seat))
6ef25fb6	460	get_seat_from_display(display, &seat, &vtnr);
fc7985ed	461	else if (streq(seat, "seat0"))
6ef25fb6	462	get_seat_from_display(display, NULL, &vtnr);
fc7985ed	463	}
4d6d6518	464
98a28fef	465	type = !isempty(display) ? "x11" :
1dc99537	466	!isempty(tty) ? "tty" : "unspecified";
98a28fef	467
55efac6c LP	468	class = pam_getenv(handle, "XDG_SESSION_CLASS");
	469	if (isempty(class))
	470	class = "user";
	471
	472	remote = !isempty(remote_host) &&
	473	!streq(remote_host, "localhost") &&
	474	!streq(remote_host, "localhost.localdomain");
98a28fef LP	475
	476	if (!dbus_message_append_args(m,
	477	DBUS_TYPE_UINT32, &uid,
	478	DBUS_TYPE_UINT32, &pid,
	479	DBUS_TYPE_STRING, &service,
	480	DBUS_TYPE_STRING, &type,
55efac6c	481	DBUS_TYPE_STRING, &class,
98a28fef	482	DBUS_TYPE_STRING, &seat,
4d6d6518	483	DBUS_TYPE_UINT32, &vtnr,
98a28fef LP	484	DBUS_TYPE_STRING, &tty,
	485	DBUS_TYPE_STRING, &display,
	486	DBUS_TYPE_BOOLEAN, &remote,
	487	DBUS_TYPE_STRING, &remote_user,
	488	DBUS_TYPE_STRING, &remote_host,
	489	DBUS_TYPE_INVALID)) {
	490	pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
	491	r = PAM_BUF_ERR;
	492	goto finish;
	493	}
8c6db833	494
98a28fef	495	dbus_message_iter_init_append(m, &iter);
8c6db833	496
98a28fef LP	497	r = bus_append_strv_iter(&iter, controllers);
	498	if (r < 0) {
	499	pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
	500	r = PAM_BUF_ERR;
	501	goto finish;
	502	}
672c48cc	503
98a28fef LP	504	r = bus_append_strv_iter(&iter, reset_controllers);
	505	if (r < 0) {
	506	pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
	507	r = PAM_BUF_ERR;
	508	goto finish;
	509	}
672c48cc	510
98a28fef LP	511	kp = kill_processes;
	512	if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &kp)) {
	513	pam_syslog(handle, LOG_ERR, "Could not attach parameter to message.");
	514	r = PAM_BUF_ERR;
	515	goto finish;
	516	}
8c6db833	517
ce959314 MS	518	if (debug)
	519	pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: "
	520	"uid=%u pid=%u service=%s type=%s seat=%s vtnr=%u tty=%s display=%s remote=%s remote_user=%s remote_host=%s",
	521	uid, pid, service, type, seat, vtnr, tty, display, yes_no(remote), remote_user, remote_host);
	522
98a28fef LP	523	reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
	524	if (!reply) {
	525	pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error));
	526	r = PAM_SESSION_ERR;
	527	goto finish;
	528	}
74fe1fe3	529
98a28fef LP	530	if (!dbus_message_get_args(reply, &error,
	531	DBUS_TYPE_STRING, &id,
	532	DBUS_TYPE_OBJECT_PATH, &object_path,
	533	DBUS_TYPE_STRING, &runtime_path,
	534	DBUS_TYPE_UNIX_FD, &session_fd,
bbc73283 LP	535	DBUS_TYPE_STRING, &seat,
bbc73283 LP	536	DBUS_TYPE_UINT32, &vtnr,
98a28fef LP	537	DBUS_TYPE_INVALID)) {
	538	pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", bus_error_message(&error));
	539	r = PAM_SESSION_ERR;
	540	goto finish;
	541	}
74fe1fe3	542
ce959314 MS	543	if (debug)
	544	pam_syslog(handle, LOG_DEBUG, "Reply from logind: "
	545	"id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u",
	546	id, object_path, runtime_path, session_fd, seat, vtnr);
	547
98a28fef LP	548	r = pam_misc_setenv(handle, "XDG_SESSION_ID", id, 0);
	549	if (r != PAM_SUCCESS) {
	550	pam_syslog(handle, LOG_ERR, "Failed to set session id.");
	551	goto finish;
8c6db833 LP	552	}
8c6db833 LP	553
98a28fef LP	554	r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", runtime_path, 0);
	555	if (r != PAM_SUCCESS) {
	556	pam_syslog(handle, LOG_ERR, "Failed to set runtime dir.");
	557	goto finish;
	558	}
8c6db833	559
bbc73283 LP	560	if (!isempty(seat)) {
	561	r = pam_misc_setenv(handle, "XDG_SEAT", seat, 0);
	562	if (r != PAM_SUCCESS) {
	563	pam_syslog(handle, LOG_ERR, "Failed to set seat.");
	564	goto finish;
	565	}
	566	}
	567
	568	if (vtnr > 0) {
	569	char buf[11];
	570	snprintf(buf, sizeof(buf), "%u", vtnr);
	571	char_array_0(buf);
	572
	573	r = pam_misc_setenv(handle, "XDG_VTNR", buf, 0);
	574	if (r != PAM_SUCCESS) {
	575	pam_syslog(handle, LOG_ERR, "Failed to set virtual terminal number.");
	576	goto finish;
	577	}
	578	}
	579
21c390cc LP	580	if (session_fd >= 0) {
	581	r = pam_set_data(handle, "systemd.session-fd", INT_TO_PTR(session_fd+1), NULL);
	582	if (r != PAM_SUCCESS) {
	583	pam_syslog(handle, LOG_ERR, "Failed to install session fd.");
	584	return r;
	585	}
98a28fef	586	}
8c6db833	587
98a28fef	588	session_fd = -1;
8c6db833	589
98a28fef	590	r = PAM_SUCCESS;
8c6db833	591
98a28fef LP	592	finish:
	593	strv_free(controllers);
	594	strv_free(reset_controllers);
	595	strv_free(kill_only_users);
	596	strv_free(kill_exclude_users);
8c6db833	597
98a28fef	598	dbus_error_free(&error);
35d2e7ec	599
98a28fef LP	600	if (bus) {
	601	dbus_connection_close(bus);
	602	dbus_connection_unref(bus);
8c6db833 LP	603	}
8c6db833 LP	604
98a28fef LP	605	if (m)
98a28fef LP	606	dbus_message_unref(m);
8c6db833	607
ed18b08b LP	608	if (reply)
	609	dbus_message_unref(reply);
	610
98a28fef LP	611	if (session_fd >= 0)
98a28fef LP	612	close_nointr_nofail(session_fd);
672c48cc	613
98a28fef LP	614	return r;
98a28fef LP	615	}
8c6db833	616
98a28fef LP	617	_public_ PAM_EXTERN int pam_sm_close_session(
	618	pam_handle_t *handle,
	619	int flags,
	620	int argc, const char **argv) {
8c6db833	621
98a28fef	622	const void *p = NULL;
75c8e3cf LP	623	const char *id;
	624	DBusConnection *bus = NULL;
	625	DBusMessage m = NULL, reply = NULL;
	626	DBusError error;
	627	int r;
8c6db833	628
75c8e3cf LP	629	assert(handle);
	630
	631	dbus_error_init(&error);
	632
	633	id = pam_getenv(handle, "XDG_SESSION_ID");
	634	if (id) {
	635
	636	/* Before we go and close the FIFO we need to tell
	637	* logind that this is a clean session shutdown, so
	638	* that it doesn't just go and slaughter us
	639	* immediately after closing the fd */
	640
	641	bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
	642	if (!bus) {
	643	pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", bus_error_message(&error));
	644	r = PAM_SESSION_ERR;
	645	goto finish;
	646	}
	647
	648	m = dbus_message_new_method_call(
	649	"org.freedesktop.login1",
	650	"/org/freedesktop/login1",
	651	"org.freedesktop.login1.Manager",
	652	"ReleaseSession");
	653	if (!m) {
	654	pam_syslog(handle, LOG_ERR, "Could not allocate release session message.");
	655	r = PAM_BUF_ERR;
	656	goto finish;
	657	}
	658
	659	if (!dbus_message_append_args(m,
	660	DBUS_TYPE_STRING, &id,
	661	DBUS_TYPE_INVALID)) {
	662	pam_syslog(handle, LOG_ERR, "Could not attach parameters to message.");
	663	r = PAM_BUF_ERR;
	664	goto finish;
	665	}
74fe1fe3	666
75c8e3cf LP	667	reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
	668	if (!reply) {
	669	pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error));
	670	r = PAM_SESSION_ERR;
	671	goto finish;
	672	}
	673	}
	674
	675	r = PAM_SUCCESS;
	676
	677	finish:
	678	pam_get_data(handle, "systemd.session-fd", &p);
98a28fef LP	679	if (p)
98a28fef LP	680	close_nointr(PTR_TO_INT(p) - 1);
1f73f0f1	681
75c8e3cf LP	682	dbus_error_free(&error);
	683
	684	if (bus) {
	685	dbus_connection_close(bus);
	686	dbus_connection_unref(bus);
	687	}
	688
	689	if (m)
	690	dbus_message_unref(m);
	691
	692	if (reply)
	693	dbus_message_unref(reply);
	694
	695	return r;
8c6db833	696	}