+++ /dev/null
-/*-*- 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 "util.h"
-#include "macro.h"
-#include "sd-daemon.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(seat);
- 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;
-
- *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, *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) && isempty(seat) && vtnr <= 0)
- get_seat_from_display(display, &seat, &vtnr);
-
- type = !isempty(display) ? "x11" :
- !isempty(tty) ? "tty" : "unspecified";
-
- 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, &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;
-
- pam_get_data(handle, "systemd.session-fd", &p);
-
- if (p)
- close_nointr(PTR_TO_INT(p) - 1);
-
- return PAM_SUCCESS;
-}
~ianmdlvl / elogind.git / blobdiff