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
|
/*++
/* NAME
/* set_ugid 3
/* SUMMARY
/* set real, effective and saved user and group attributes
/* SYNOPSIS
/* #include <set_ugid.h>
/*
/* void set_ugid(uid, gid)
/* uid_t uid;
/* gid_t gid;
/* DESCRIPTION
/* set_ugid() sets the real, effective and saved user and group process
/* attributes and updates the process group access list to be just the
/* user's primary group. This operation is irreversible.
/* DIAGNOSTICS
/* All system call errors are fatal.
/* SEE ALSO
/* setuid(2), setgid(2), setgroups(2)
/* 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 <unistd.h>
#include <grp.h>
#include <errno.h>
/* Utility library. */
#include "msg.h"
#include "set_ugid.h"
/* set_ugid - set real, effective and saved user and group attributes */
void set_ugid(uid_t uid, gid_t gid)
{
int saved_errno = errno;
if (geteuid() != 0)
if (seteuid(0) < 0)
msg_fatal("seteuid(0): %m");
if (setgid(gid) < 0)
msg_fatal("setgid(%ld): %m", (long) gid);
if (setgroups(1, &gid) < 0)
msg_fatal("setgroups(1, &%ld): %m", (long) gid);
if (setuid(uid) < 0)
msg_fatal("setuid(%ld): %m", (long) uid);
if (msg_verbose > 1)
msg_info("setugid: uid %ld gid %ld", (long) uid, (long) gid);
errno = saved_errno;
}
|
