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/* privileges.c
* Routines for handling privileges, e.g. set-UID and set-GID on UNIX.
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 2006 Gerald Combs
*
* 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 2
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include "privileges.h"
#include "emem.h"
#ifdef _WIN32
/*
* Called when the program starts, to save whatever credential information
* we'll need later.
*/
void
get_credential_info(void)
{
}
/*
* For now, we say the program wasn't started with special privileges.
* There are ways of running programs with credentials other than those
* for the session in which it's run, but I don't know whether that'd be
* done with Wireshark/TShark or not.
*/
gboolean
started_with_special_privs(void)
{
return FALSE;
}
/*
* For now, we say the program isn't running with special privileges.
* There are ways of running programs with credentials other than those
* for the session in which it's run, but I don't know whether that'd be
* done with Wireshark/TShark or not.
*/
gboolean
running_with_special_privs(void)
{
return FALSE;
}
/*
* For now, we don't do anything when asked to relinquish special privileges.
*/
void
relinquish_special_privs_perm(void)
{
}
/*
* Get the current username. String must be g_free()d after use.
*/
gchar *
get_cur_username(void) {
gchar *username;
username = g_strdup("UNKNOWN");
return username;
}
/*
* Get the current group. String must be g_free()d after use.
*/
gchar *
get_cur_groupname(void) {
gchar *groupname;
groupname = g_strdup("UNKNOWN");
return groupname;
}
#else /* _WIN32 */
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#include <glib.h>
#include <string.h>
#include <errno.h>
static uid_t ruid, euid;
static gid_t rgid, egid;
/*
* Called when the program starts, to save whatever credential information
* we'll need later.
* That'd be the real and effective UID and GID on UNIX.
*/
void
get_credential_info(void)
{
ruid = getuid();
euid = geteuid();
rgid = getgid();
egid = getegid();
}
/*
* "Started with special privileges" means "started out set-UID or set-GID",
* or run as the root user or group.
*/
gboolean
started_with_special_privs(void)
{
#ifdef HAVE_ISSETUGID
return issetugid();
#else
return (ruid != euid || rgid != egid || ruid == 0 || rgid == 0);
#endif
}
/*
* Return TRUE if the real, effective, or saved (if we can check it) user
* ID or group are 0.
*/
gboolean
running_with_special_privs(void)
{
#ifdef HAVE_SETRESUID
uid_t ru, eu, su;
#endif
#ifdef HAVE_SETRESGID
gid_t rg, eg, sg;
#endif
#ifdef HAVE_SETRESUID
getresuid(&ru, &eu, &su);
if (ru == 0 || eu == 0 || su == 0)
return TRUE;
#else
if (getuid() == 0 || geteuid() == 0)
return TRUE;
#endif
#ifdef HAVE_SETRESGID
getresgid(&rg, &eg, &sg);
if (rg == 0 || eg == 0 || sg == 0)
return TRUE;
#else
if (getgid() == 0 || getegid() == 0)
return TRUE;
#endif
return FALSE;
}
/*
* Permanently relinquish set-UID and set-GID privileges.
* Ignore errors for now - if we have the privileges, we should
* be able to relinquish them.
*/
void
relinquish_special_privs_perm(void)
{
/* If we're running setuid, switch to the calling user */
#ifdef HAVE_SETRESGID
setresgid(rgid, rgid, rgid);
#else
setgid(rgid);
setegid(rgid);
#endif
#ifdef HAVE_SETRESUID
setresuid(ruid, ruid, ruid);
#else
setuid(ruid);
seteuid(ruid);
#endif
}
/*
* Get the current username. String must be g_free()d after use.
*/
gchar *
get_cur_username(void) {
gchar *username;
struct passwd *pw = getpwuid(getuid());
if (pw) {
username = g_strdup(pw->pw_name);
} else {
username = g_strdup("UNKNOWN");
}
endpwent();
return username;
}
/*
* Get the current group. String must be g_free()d after use.
*/
gchar *
get_cur_groupname(void) {
gchar *groupname;
struct group *gr = getgrgid(getgid());
if (gr) {
groupname = g_strdup(gr->gr_name);
} else {
groupname = g_strdup("UNKNOWN");
}
endgrent();
return groupname;
}
#endif /* _WIN32 */
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