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
74
75
|
/*-
* Copyright (C) 2005 Diomidis Spinellis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/syslog.h>
#include "portald.h"
/*
* Set the process's credentials to those specified in user,
* saving the existing ones in save.
* Return 0 on success, -1 (with errno set) on error.
*/
int
set_user_credentials(struct portal_cred *user, struct portal_cred *save)
{
save->pcr_uid = geteuid();
if ((save->pcr_ngroups = getgroups(NGROUPS_MAX, save->pcr_groups)) < 0)
return (-1);
if (setgroups(user->pcr_ngroups, user->pcr_groups) < 0)
return (-1);
if (seteuid(user->pcr_uid) < 0)
return (-1);
return (0);
}
/*
* Restore the process's credentials to the ones specified in save.
* Log failures using LOG_ERR.
* Return 0 on success, -1 (with errno set) on error.
*/
int
restore_credentials(struct portal_cred *save)
{
if (seteuid(save->pcr_uid) < 0) {
syslog(LOG_ERR, "seteuid: %m");
return (-1);
}
if (setgroups(save->pcr_ngroups, save->pcr_groups) < 0) {
syslog(LOG_ERR, "setgroups: %m");
return (-1);
}
return (0);
}
|
