1/*	$NetBSD$	*/
2
3/*++
4/* NAME
5/*	stat_as 3
6/* SUMMARY
7/*	stat file as user
8/* SYNOPSIS
9/*	#include <sys/stat.h>
10/*	#include <stat_as.h>
11/*
12/*	int	stat_as(path, st, euid, egid)
13/*	const char *path;
14/*	struct stat *st;
15/*	uid_t	euid;
16/*	gid_t	egid;
17/* DESCRIPTION
18/*	stat_as() looks up the file status of the named \fIpath\fR,
19/*	using the effective rights specified by \fIeuid\fR
20/*	and \fIegid\fR, and stores the result into the structure pointed
21/*	to by \fIst\fR.  A -1 result means the lookup failed.
22/*	This call follows symbolic links.
23/* DIAGNOSTICS
24/*	Fatal error: no permission to change privilege level.
25/* SEE ALSO
26/*	set_eugid(3) switch effective rights
27/* LICENSE
28/* .ad
29/* .fi
30/*	The Secure Mailer license must be distributed with this software.
31/* AUTHOR(S)
32/*	Wietse Venema
33/*	IBM T.J. Watson Research
34/*	P.O. Box 704
35/*	Yorktown Heights, NY 10598, USA
36/*--*/
37
38/* System library. */
39
40#include <sys_defs.h>
41#include <sys/stat.h>
42#include <unistd.h>
43
44/* Utility library. */
45
46#include "msg.h"
47#include "set_eugid.h"
48#include "stat_as.h"
49
50/* stat_as - stat file as user */
51
52int     stat_as(const char *path, struct stat * st, uid_t euid, gid_t egid)
53{
54    uid_t   saved_euid = geteuid();
55    gid_t   saved_egid = getegid();
56    int     status;
57
58    /*
59     * Switch to the target user privileges.
60     */
61    set_eugid(euid, egid);
62
63    /*
64     * Stat that file.
65     */
66    status = stat(path, st);
67
68    /*
69     * Restore saved privileges.
70     */
71    set_eugid(saved_euid, saved_egid);
72
73    return (status);
74}
75