1 /*	$NetBSD: stat_as.c,v 1.1.1.1 2009/06/23 10:09:01 tron Exp $	*/
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 
52 int     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