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authorLennart Poettering <lennart@poettering.net>2010-08-11 01:43:23 +0200
committerLennart Poettering <lennart@poettering.net>2010-08-11 01:44:38 +0200
commit4927fcae48de061393b3ce9c12d49f80d73fbf1d (patch)
tree4034f6843ab1ed8ca8e3d9acf87897a9fd592c5e /src/update-utmp.c
parentb95cf3629e8d78a0d28e71b0f5559fa9a8c038b5 (diff)
audit,utmp: implement audit logic and rip utmp stuff out of the main daemon and into a helper binary
Diffstat (limited to 'src/update-utmp.c')
-rw-r--r--src/update-utmp.c410
1 files changed, 410 insertions, 0 deletions
diff --git a/src/update-utmp.c b/src/update-utmp.c
new file mode 100644
index 0000000000..e64a819aa4
--- /dev/null
+++ b/src/update-utmp.c
@@ -0,0 +1,410 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+ 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 <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <libaudit.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <dbus/dbus.h>
+
+#include "log.h"
+#include "macro.h"
+#include "util.h"
+#include "special.h"
+#include "utmp-wtmp.h"
+#include "dbus-common.h"
+
+typedef struct Context {
+ DBusConnection *bus;
+#ifdef HAVE_AUDIT
+ int audit_fd;
+#endif
+} Context;
+
+static usec_t get_startup_time(Context *c) {
+ const char
+ *interface = "org.freedesktop.systemd1.Manager",
+ *property = "StartupTimestamp";
+
+ DBusError error;
+ usec_t t = 0;
+ DBusMessage *m = NULL, *reply = NULL;
+ DBusMessageIter iter, sub;
+
+ dbus_error_init(&error);
+
+ assert(c);
+
+ if (!(m = dbus_message_new_method_call(
+ "org.freedesktop.systemd1",
+ "/org/freedesktop/systemd1",
+ "org.freedesktop.DBus.Properties",
+ "Get"))) {
+ log_error("Could not allocate message.");
+ goto finish;
+ }
+
+ if (!dbus_message_append_args(m,
+ DBUS_TYPE_STRING, &interface,
+ DBUS_TYPE_STRING, &property,
+ DBUS_TYPE_INVALID)) {
+ log_error("Could not append arguments to message.");
+ goto finish;
+ }
+
+ if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
+ log_error("Failed to send command: %s", error.message);
+ goto finish;
+ }
+
+ if (!dbus_message_iter_init(reply, &iter) ||
+ dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
+ log_error("Failed to parse reply.");
+ goto finish;
+ }
+
+ dbus_message_iter_recurse(&iter, &sub);
+
+ if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_UINT64) {
+ log_error("Failed to parse reply.");
+ goto finish;
+ }
+
+ dbus_message_iter_get_basic(&sub, &t);
+
+finish:
+ if (m)
+ dbus_message_unref(m);
+
+ if (reply)
+ dbus_message_unref(reply);
+
+ dbus_error_free(&error);
+
+ return t;
+}
+
+static int get_current_runlevel(Context *c) {
+ static const struct {
+ const int runlevel;
+ const char *special;
+ } table[] = {
+ /* The first target of this list that is active or has
+ * a job scheduled wins */
+ { '0', SPECIAL_POWEROFF_TARGET },
+ { '6', SPECIAL_REBOOT_TARGET },
+ { '5', SPECIAL_RUNLEVEL5_TARGET },
+ { '4', SPECIAL_RUNLEVEL4_TARGET },
+ { '3', SPECIAL_RUNLEVEL3_TARGET },
+ { '2', SPECIAL_RUNLEVEL2_TARGET },
+ { '1', SPECIAL_RESCUE_TARGET },
+ };
+ const char
+ *interface = "org.freedesktop.systemd1.Unit",
+ *property = "ActiveState";
+
+ DBusMessage *m = NULL, *reply = NULL;
+ int r = 0;
+ unsigned i;
+ DBusError error;
+
+ assert(c);
+
+ dbus_error_init(&error);
+
+ for (i = 0; i < ELEMENTSOF(table); i++) {
+ const char *path = NULL, *state;
+ DBusMessageIter iter, sub;
+
+ if (!(m = dbus_message_new_method_call(
+ "org.freedesktop.systemd1",
+ "/org/freedesktop/systemd1",
+ "org.freedesktop.systemd1.Manager",
+ "GetUnit"))) {
+ log_error("Could not allocate message.");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (!dbus_message_append_args(m,
+ DBUS_TYPE_STRING, &table[i].special,
+ DBUS_TYPE_INVALID)) {
+ log_error("Could not append arguments to message.");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
+ dbus_error_free(&error);
+ continue;
+ }
+
+ if (!dbus_message_get_args(reply, &error,
+ DBUS_TYPE_OBJECT_PATH, &path,
+ DBUS_TYPE_INVALID)) {
+ log_error("Failed to parse reply: %s", error.message);
+ r = -EIO;
+ goto finish;
+ }
+
+ dbus_message_unref(m);
+ if (!(m = dbus_message_new_method_call(
+ "org.freedesktop.systemd1",
+ path,
+ "org.freedesktop.DBus.Properties",
+ "Get"))) {
+ log_error("Could not allocate message.");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if (!dbus_message_append_args(m,
+ DBUS_TYPE_STRING, &interface,
+ DBUS_TYPE_STRING, &property,
+ DBUS_TYPE_INVALID)) {
+ log_error("Could not append arguments to message.");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ dbus_message_unref(reply);
+ if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
+ log_error("Failed to send command: %s", error.message);
+ r = -EIO;
+ goto finish;
+ }
+
+ if (!dbus_message_iter_init(reply, &iter) ||
+ dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
+ log_error("Failed to parse reply.");
+ r = -EIO;
+ goto finish;
+ }
+
+ dbus_message_iter_recurse(&iter, &sub);
+
+ if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
+ log_error("Failed to parse reply.");
+ r = -EIO;
+ goto finish;
+ }
+
+ dbus_message_iter_get_basic(&sub, &state);
+
+ if (streq(state, "active") || streq(state, "reloading"))
+ r = table[i].runlevel;
+
+ dbus_message_unref(m);
+ dbus_message_unref(reply);
+ m = reply = NULL;
+
+ if (r)
+ break;
+ }
+
+finish:
+ if (m)
+ dbus_message_unref(m);
+
+ if (reply)
+ dbus_message_unref(reply);
+
+ dbus_error_free(&error);
+
+ return r;
+}
+
+static int on_reboot(Context *c) {
+ int r = 0, q;
+ usec_t t;
+
+ assert(c);
+
+ /* We finished start-up, so let's write the utmp
+ * record and send the audit msg */
+
+#ifdef HAVE_AUDIT
+ if (c->audit_fd >= 0)
+ if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "", NULL, NULL, NULL, 1) < 0) {
+ log_error("Failed to send audit message: %m");
+ r = -errno;
+ }
+#endif
+
+ /* If this call fails it will return 0, which
+ * utmp_put_reboot() will then fix to the current time */
+ t = get_startup_time(c);
+
+ if ((q = utmp_put_reboot(t)) < 0) {
+ log_error("Failed to write utmp record: %s", strerror(-q));
+ r = q;
+ }
+
+ return r;
+}
+
+static int on_shutdown(Context *c) {
+ int r = 0, q;
+
+ assert(c);
+
+ /* We started shut-down, so let's write the utmp
+ * record and send the audit msg */
+
+#ifdef HAVE_AUDIT
+ if (c->audit_fd >= 0)
+ if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "", NULL, NULL, NULL, 1) < 0) {
+ log_error("Failed to send audit message: %m");
+ r = -errno;
+ }
+#endif
+
+ if ((q = utmp_put_shutdown(0)) < 0) {
+ log_error("Failed to write utmp record: %s", strerror(-q));
+ r = q;
+ }
+
+ return r;
+}
+
+static int on_runlevel(Context *c) {
+ int r = 0, q, previous, runlevel;
+
+ assert(c);
+
+ /* We finished changing runlevel, so let's write the
+ * utmp record and send the audit msg */
+
+ /* First, get last runlevel */
+ if ((q = utmp_get_runlevel(&previous, NULL)) < 0) {
+
+ if (q != -ESRCH && q != -ENOENT) {
+ log_error("Failed to get current runlevel: %s", strerror(-q));
+ return q;
+ }
+
+ /* Hmm, we didn't find any runlevel, that means we
+ * have been rebooted */
+ r = on_reboot(c);
+ previous = 0;
+ }
+
+ /* Second get new runlevel */
+ if ((runlevel = get_current_runlevel(c)) < 0)
+ return runlevel;
+
+ if (previous == runlevel)
+ return 0;
+
+#ifdef HAVE_AUDIT
+ if (c->audit_fd >= 0) {
+ char *s = NULL;
+
+ if (asprintf(&s, "old-level=%c new-level=%c", previous, runlevel) < 0)
+ return -ENOMEM;
+
+ if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, NULL, NULL, NULL, 1) < 0) {
+ log_error("Failed to send audit message: %m");
+ r = -errno;
+ }
+
+ free(s);
+ }
+#endif
+
+ if ((q = utmp_put_runlevel(0, runlevel, previous)) < 0) {
+ log_error("Failed to write utmp record: %s", strerror(-q));
+ r = q;
+ }
+
+ return r;
+}
+
+int main(int argc, char *argv[]) {
+ int r;
+ DBusError error;
+ Context c;
+
+ dbus_error_init(&error);
+
+ zero(c);
+#ifdef HAVE_AUDIT
+ c.audit_fd = -1;
+#endif
+
+ /* if (getppid() != 1) { */
+ /* log_error("This program should be invoked by init only."); */
+ /* return 1; */
+ /* } */
+
+ if (argc != 2) {
+ log_error("This program requires one argument.");
+ return 1;
+ }
+
+ log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
+ log_parse_environment();
+
+#ifdef HAVE_AUDIT
+ if ((c.audit_fd = audit_open()) < 0)
+ log_error("Failed to connect to audit log: %m");
+#endif
+
+ if (bus_connect(DBUS_BUS_SYSTEM, &c.bus, NULL, &error) < 0) {
+ log_error("Failed to get D-Bus connection: %s", error.message);
+ r = -EIO;
+ goto finish;
+ }
+
+ log_info("systemd-update-utmp running as pid %lu", (unsigned long) getpid());
+
+ if (streq(argv[1], "reboot"))
+ r = on_reboot(&c);
+ else if (streq(argv[1], "shutdown"))
+ r = on_shutdown(&c);
+ else if (streq(argv[1], "runlevel"))
+ r = on_runlevel(&c);
+ else {
+ log_error("Unknown command %s", argv[1]);
+ r = -EINVAL;
+ }
+
+ log_info("systemd-update-utmp stopped as pid %lu", (unsigned long) getpid());
+finish:
+
+#ifdef HAVE_AUDIT
+ if (c.audit_fd >= 0)
+ audit_close(c.audit_fd);
+#endif
+
+ if (c.bus) {
+ dbus_connection_close(c.bus);
+ dbus_connection_unref(c.bus);
+ }
+
+ dbus_error_free(&error);
+ dbus_shutdown();
+
+ return r < 0 ? 1 : 0;
+}