xref: /netbsd-src/external/bsd/openpam/dist/lib/libpam/pam_getenv.c (revision 0d9d0fd8a30be9a1924e715bbcf67a4a83efd262)
1 /*	$NetBSD: pam_getenv.c,v 1.5 2023/06/30 21:46:21 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
5  * Copyright (c) 2004-2019 Dag-Erling Smørgrav
6  * All rights reserved.
7  *
8  * This software was developed for the FreeBSD Project by ThinkSec AS and
9  * Network Associates Laboratories, the Security Research Division of
10  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
11  * ("CBOSS"), as part of the DARPA CHATS research program.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 3. The name of the author may not be used to endorse or promote
22  *    products derived from this software without specific prior written
23  *    permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 #ifdef HAVE_CONFIG_H
39 # include "config.h"
40 #endif
41 
42 #include <sys/cdefs.h>
43 __RCSID("$NetBSD: pam_getenv.c,v 1.5 2023/06/30 21:46:21 christos Exp $");
44 
45 #include <errno.h>
46 #include <stdlib.h>
47 #include <string.h>
48 
49 #include <security/pam_appl.h>
50 
51 #include "openpam_impl.h"
52 
53 /*
54  * XSSO 4.2.1
55  * XSSO 6 page 44
56  *
57  * Retrieve the value of a PAM environment variable
58  */
59 
60 const char *
pam_getenv(pam_handle_t * pamh,const char * name)61 pam_getenv(pam_handle_t *pamh,
62 	const char *name)
63 {
64 	size_t len;
65 	int i;
66 
67 	ENTERS(name);
68 	for (len = 0; name[len] != '\0'; ++len) {
69 		if (name[len] == '=') {
70 			errno = EINVAL;
71 			RETURNS(NULL);
72 		}
73 	}
74 	if ((i = openpam_findenv(pamh, name, len)) < 0)
75 		RETURNS(NULL);
76 	/* assert(pamh->env[i][len] == '='); */
77 	RETURNS(pamh->env[i] + len + 1);
78 }
79 
80 /**
81  * The =pam_getenv function returns the value of an environment variable.
82  * Its semantics are similar to those of =getenv, but it accesses the PAM
83  * context's environment list instead of the application's.
84  *
85  * >pam_getenvlist
86  * >pam_putenv
87  * >pam_setenv
88  */
89