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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 <fcntl.h>
#include <wait.h>
#include <grp.h>
#include <syslog.h>
#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-lowlevel.h>
#include <polkit/polkit.h>
#include "util.h"
static gchar *
_polkit_subject_get_cmdline (PolkitSubject *subject, gint *pid, gint *uid)
{
PolkitSubject *process;
gchar *ret;
gchar *filename;
gchar *contents;
gsize contents_len;
GError *error;
guint n;
g_return_val_if_fail (subject != NULL, NULL);
error = NULL;
ret = NULL;
process = NULL;
filename = NULL;
contents = NULL;
if (POLKIT_IS_UNIX_PROCESS (subject))
{
process = g_object_ref (subject);
}
else if (POLKIT_IS_SYSTEM_BUS_NAME (subject))
{
process = polkit_system_bus_name_get_process_sync (POLKIT_SYSTEM_BUS_NAME (subject),
NULL,
&error);
if (process == NULL)
{
g_warning ("Error getting process for system bus name `%s': %s",
polkit_system_bus_name_get_name (POLKIT_SYSTEM_BUS_NAME (subject)),
error->message);
g_error_free (error);
goto out;
}
}
else
{
g_warning ("Unknown subject type passed to guess_program_name()");
goto out;
}
*pid = polkit_unix_process_get_pid (POLKIT_UNIX_PROCESS (process));
*uid = polkit_unix_process_get_owner (POLKIT_UNIX_PROCESS (process), NULL);
filename = g_strdup_printf ("/proc/%d/cmdline", *pid);
if (!g_file_get_contents (filename,
&contents,
&contents_len,
&error))
{
g_warning ("Error openeing `%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);
if (process != NULL)
g_object_unref (process);
return ret;
}
void
sys_log (DBusGMethodInvocation *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;
gchar *id;
gint pid = 0;
gint uid = 0;
gchar *tmp;
subject = polkit_system_bus_name_new (dbus_g_method_get_sender (context));
id = polkit_subject_to_string (subject);
cmdline = _polkit_subject_get_cmdline (subject, &pid, &uid);
if (cmdline == NULL) {
tmp = g_strdup_printf ("request by %s: %s", id, msg);
}
else {
tmp = g_strdup_printf ("request by %s [%s pid:%d uid:%d]: %s", id, cmdline, pid, uid, 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 (DBusGMethodInvocation *context, gchar *loginuid, gint size)
{
PolkitSubject *subject;
gchar *cmdline;
gint pid;
gint uid;
gchar *path;
gchar *buf;
subject = polkit_system_bus_name_new (dbus_g_method_get_sender (context));
cmdline = _polkit_subject_get_cmdline (subject, &pid, &uid);
g_free (cmdline);
g_object_unref (subject);
path = g_strdup_printf ("/proc/%d/loginuid", pid);
if (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 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 (DBusGMethodInvocation *context,
gchar *argv[],
GError **error)
{
GError *local_error;
gchar loginuid[20];
gchar *std_err;
gint status;
get_caller_loginuid (context, loginuid, 20);
local_error = NULL;
std_err = NULL;
if (!g_spawn_sync (NULL, argv, NULL, 0, setup_loginuid, loginuid, NULL, &std_err, &status, &local_error)) {
g_propagate_error (error, local_error);
g_free (std_err);
return FALSE;
}
if (WEXITSTATUS (status) != 0) {
g_set_error (error,
G_SPAWN_ERROR,
G_SPAWN_ERROR_FAILED,
"%s returned an error (%d): %s",
argv[0], WEXITSTATUS(status), std_err);
g_free (std_err);
return FALSE;
}
g_free (std_err);
return TRUE;
}
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_warning ("user %s has %d groups\n", user, ngroups);
*groups = g_new (gid_t, ngroups);
res = getgrouplist (user, group, *groups, &ngroups);
return res;
}
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