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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2009-2010 Red Hat, Inc.
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by: Matthias Clasen <mclasen@redhat.com>
*/
#include "config.h"
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <grp.h>
#include <syslog.h>
#include <polkit/polkit.h>
#include "util.h"
static gchar *
get_cmdline_of_pid (GPid pid)
{
gchar *ret = NULL;
gchar *filename;
gchar *contents;
gsize contents_len;
GError *error;
guint n;
filename = g_strdup_printf ("/proc/%d/cmdline", (int) pid);
if (!g_file_get_contents (filename,
&contents,
&contents_len,
&error))
{
g_warning ("Error opening `%s': %s",
filename,
error->message);
g_error_free (error);
goto out;
}
/* The kernel uses '\0' to separate arguments - replace those with a space. */
for (n = 0; n < contents_len - 1; n++)
{
if (contents[n] == '\0')
contents[n] = ' ';
}
ret = g_strdup (contents);
g_strstrip (ret);
out:
g_free (filename);
g_free (contents);
return ret;
}
static gboolean
get_caller_pid (GDBusMethodInvocation *context,
GPid *pid)
{
GVariant *reply;
GError *error;
guint32 pid_as_int;
error = NULL;
reply = g_dbus_connection_call_sync (g_dbus_method_invocation_get_connection (context),
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionUnixProcessID",
g_variant_new ("(s)",
g_dbus_method_invocation_get_sender (context)),
G_VARIANT_TYPE ("(u)"),
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if (reply == NULL) {
g_warning ("Could not talk to message bus to find uid of sender %s: %s",
g_dbus_method_invocation_get_sender (context),
error->message);
g_error_free (error);
return FALSE;
}
g_variant_get (reply, "(u)", &pid_as_int);
*pid = pid_as_int;
g_variant_unref (reply);
return TRUE;
}
void
sys_log (GDBusMethodInvocation *context,
const gchar *format,
...)
{
va_list args;
gchar *msg;
va_start (args, format);
msg = g_strdup_vprintf (format, args);
va_end (args);
if (context) {
PolkitSubject *subject;
gchar *cmdline = NULL;
gchar *id;
GPid pid = 0;
gint uid = -1;
gchar *tmp;
subject = polkit_system_bus_name_new (g_dbus_method_invocation_get_sender (context));
id = polkit_subject_to_string (subject);
if (get_caller_pid (context, &pid)) {
cmdline = get_cmdline_of_pid (pid);
} else {
pid = 0;
cmdline = NULL;
}
if (cmdline != NULL) {
if (get_caller_uid (context, &uid)) {
tmp = g_strdup_printf ("request by %s [%s pid:%d uid:%d]: %s", id, cmdline, (int) pid, uid, msg);
} else {
tmp = g_strdup_printf ("request by %s [%s pid:%d]: %s", id, cmdline, (int) pid, msg);
}
} else {
if (get_caller_uid (context, &uid) && pid != 0) {
tmp = g_strdup_printf ("request by %s [pid:%d uid:%d]: %s", id, (int) pid, uid, msg);
} else if (pid != 0) {
tmp = g_strdup_printf ("request by %s [pid:%d]: %s", id, (int) pid, msg);
} else {
tmp = g_strdup_printf ("request by %s: %s", id, msg);
}
}
g_free (msg);
msg = tmp;
g_free (id);
g_free (cmdline);
g_object_unref (subject);
}
syslog (LOG_NOTICE, "%s", msg);
g_free (msg);
}
static void
get_caller_loginuid (GDBusMethodInvocation *context, gchar *loginuid, gint size)
{
GPid pid;
gint uid;
gchar *path;
gchar *buf;
if (!get_caller_uid (context, &uid)) {
uid = getuid ();
}
if (get_caller_pid (context, &pid)) {
path = g_strdup_printf ("/proc/%d/loginuid", (int) pid);
} else {
path = NULL;
}
if (path != NULL && g_file_get_contents (path, &buf, NULL, NULL)) {
strncpy (loginuid, buf, size);
g_free (buf);
}
else {
g_snprintf (loginuid, size, "%d", uid);
}
g_free (path);
}
static gboolean
compat_check_exit_status (int estatus,
GError **error)
{
#if GLIB_CHECK_VERSION(2, 33, 12)
return g_spawn_check_exit_status (estatus, error);
#else
if (!WIFEXITED (estatus)) {
g_set_error (error,
G_SPAWN_ERROR,
G_SPAWN_ERROR_FAILED,
"Exited abnormally");
return FALSE;
}
if (WEXITSTATUS (estatus) != 0) {
g_set_error (error,
G_SPAWN_ERROR,
G_SPAWN_ERROR_FAILED,
"Exited with code %d",
WEXITSTATUS(estatus));
return FALSE;
}
return TRUE;
#endif
}
static void
setup_loginuid (gpointer data)
{
const char *id = data;
int fd;
fd = open ("/proc/self/loginuid", O_WRONLY);
write (fd, id, strlen (id));
close (fd);
}
gboolean
spawn_with_login_uid (GDBusMethodInvocation *context,
const gchar *argv[],
GError **error)
{
gboolean ret = FALSE;
gchar loginuid[20];
gint status;
get_caller_loginuid (context, loginuid, G_N_ELEMENTS (loginuid));
if (!g_spawn_sync (NULL, (gchar**)argv, NULL, 0, setup_loginuid, loginuid, NULL, NULL, &status, error))
goto out;
if (!compat_check_exit_status (status, error))
goto out;
ret = TRUE;
out:
return ret;
}
gint
get_user_groups (const gchar *user,
gid_t group,
gid_t **groups)
{
gint res;
gint ngroups;
ngroups = 0;
res = getgrouplist (user, group, NULL, &ngroups);
g_debug ("user %s has %d groups", user, ngroups);
*groups = g_new (gid_t, ngroups);
res = getgrouplist (user, group, *groups, &ngroups);
return res;
}
gboolean
get_caller_uid (GDBusMethodInvocation *context,
gint *uid)
{
GVariant *reply;
GError *error;
error = NULL;
reply = g_dbus_connection_call_sync (g_dbus_method_invocation_get_connection (context),
"org.freedesktop.DBus",
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"GetConnectionUnixUser",
g_variant_new ("(s)",
g_dbus_method_invocation_get_sender (context)),
G_VARIANT_TYPE ("(u)"),
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL,
&error);
if (reply == NULL) {
g_warning ("Could not talk to message bus to find uid of sender %s: %s",
g_dbus_method_invocation_get_sender (context),
error->message);
g_error_free (error);
return FALSE;
}
g_variant_get (reply, "(u)", uid);
g_variant_unref (reply);
return TRUE;
}
void
add_user_to_group (GDBusMethodInvocation *context,
const char *user_name,
const char *group_name)
{
GError *error;
gchar *argv[4];
argv[0] = (gchar*) "/usr/sbin/adduser";
argv[1] = (gchar*) user_name;
argv[2] = (gchar*) group_name;
argv[3] = NULL;
error = NULL;
if (!spawn_with_login_uid (context, argv, &error)) {
g_warning ("failed to add user %s to group %s", user_name, group_name);
g_error_free (error);
return;
}
}
void
remove_user_from_group (GDBusMethodInvocation *context,
const char *user_name,
const char *group_name)
{
GError *error;
gchar *argv[4];
argv[0] = (gchar*) "/usr/sbin/deluser";
argv[1] = (gchar*) user_name;
argv[2] = (gchar*) group_name;
argv[3] = NULL;
error = NULL;
if (!spawn_with_login_uid (context, argv, &error)) {
g_warning ("failed to remove user %s from group %s", user_name, group_name);
g_error_free (error);
return;
}
}
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