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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*-
* Copyright (c) 2001 Mark R V Murray
* 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 THE 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 THE 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <ttyent.h>
#include <string.h>
#define PAM_SM_AUTH
#include <security/pam_modules.h>
#include <pam_mod_misc.h>
#define TTY_PREFIX "/dev/"
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t * pamh, int flags, int argc, const char **argv)
{
struct options options;
struct ttyent *ttyfileinfo;
struct passwd *user_pwd;
int retval;
const char *user, *ttyname;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
retval = pam_get_user(pamh, &user, NULL);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got user: %s", user);
retval = pam_get_item(pamh, PAM_TTY, (const void **)&ttyname);
if (retval != PAM_SUCCESS)
PAM_RETURN(retval);
PAM_LOG("Got TTY: %s", ttyname);
/* Ignore any "/dev/" on the PAM_TTY item */
if (strncmp(TTY_PREFIX, ttyname, sizeof(TTY_PREFIX) - 1) == 0)
ttyname += sizeof(TTY_PREFIX) - 1;
/* If the user is not root, secure ttys do not apply */
user_pwd = getpwnam(user);
if (user_pwd == NULL)
PAM_RETURN(PAM_IGNORE);
else if (user_pwd->pw_uid != 0)
PAM_RETURN(PAM_SUCCESS);
PAM_LOG("User is not root");
ttyfileinfo = getttynam(ttyname);
if (ttyfileinfo == NULL)
PAM_RETURN(PAM_SERVICE_ERR);
PAM_LOG("Got ttyfileinfo");
if (ttyfileinfo->ty_status & TTY_SECURE)
PAM_RETURN(PAM_SUCCESS);
else
PAM_RETURN(PAM_PERM_DENIED);
}
PAM_EXTERN
int
pam_sm_setcred(pam_handle_t * pamh, int flags, int argc, const char **argv)
{
return PAM_SUCCESS;
}
PAM_MODULE_ENTRY("pam_securetty");
|
