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authorLennart Poettering <lennart@poettering.net>2011-12-31 18:06:21 +0100
committerLennart Poettering <lennart@poettering.net>2011-12-31 18:06:56 +0100
commitbe5f4385d61d512f0c3c75b70df9f77eac2b8331 (patch)
tree03e858c40aedeb9e08122280a948a2740016b240 /src/login
parent5e2c93666f2590614214a33027002b431ebafebc (diff)
login: move the PAM module to src/login/ since it is just a client to logind
Diffstat (limited to 'src/login')
-rw-r--r--src/login/pam-module.c618
1 files changed, 618 insertions, 0 deletions
diff --git a/src/login/pam-module.c b/src/login/pam-module.c
new file mode 100644
index 0000000000..14e706b374
--- /dev/null
+++ b/src/login/pam-module.c
@@ -0,0 +1,618 @@
+/*-*- 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;
+}