1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/*++
/* NAME
/* lstat_as 3
/* SUMMARY
/* lstat file as user
/* SYNOPSIS
/* #include <sys/stat.h>
/* #include <lstat_as.h>
/*
/* int lstat_as(path, st, euid, egid)
/* const char *path;
/* struct stat *st;
/* uid_t euid;
/* gid_t egid;
/* DESCRIPTION
/* lstat_as() looks up the file status of the named \fIpath\fR,
/* using the effective rights specified by \fIeuid\fR
/* and \fIegid\fR, and stores the result into the structure pointed
/* to by \fIst\fR. A -1 result means the lookup failed.
/* This call does not follow symbolic links.
/* DIAGNOSTICS
/* Fatal error: no permission to change privilege level.
/* SEE ALSO
/* set_eugid(3) switch effective rights
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <sys/stat.h>
#include <unistd.h>
/* Utility library. */
#include "msg.h"
#include "set_eugid.h"
#include "lstat_as.h"
#include "warn_stat.h"
/* lstat_as - lstat file as user */
int lstat_as(const char *path, struct stat * st, uid_t euid, gid_t egid)
{
uid_t saved_euid = geteuid();
gid_t saved_egid = getegid();
int status;
/*
* Switch to the target user privileges.
*/
set_eugid(euid, egid);
/*
* Lstat that file.
*/
status = lstat(path, st);
/*
* Restore saved privileges.
*/
set_eugid(saved_euid, saved_egid);
return (status);
}
|
