1 /* $NetBSD: pam_setenv.c,v 1.4 2023/06/30 21:46:21 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
5 * Copyright (c) 2004-2017 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_setenv.c,v 1.4 2023/06/30 21:46:21 christos Exp $");
44
45 #include <errno.h>
46 #include <stdlib.h>
47 #include <stdio.h>
48 #include <string.h>
49
50 #include <security/pam_appl.h>
51
52 #include "openpam_impl.h"
53 #include "openpam_asprintf.h"
54
55 /*
56 * OpenPAM extension
57 *
58 * Set the value of an environment variable
59 * Mirrors setenv(3)
60 */
61
62 int
pam_setenv(pam_handle_t * pamh,const char * name,const char * value,int overwrite)63 pam_setenv(pam_handle_t *pamh,
64 const char *name,
65 const char *value,
66 int overwrite)
67 {
68 char *env;
69 int r;
70
71 ENTER();
72
73 /* sanity checks */
74 if (*name == '\0' || strchr(name, '=') != NULL) {
75 errno = EINVAL;
76 RETURNC(PAM_SYSTEM_ERR);
77 }
78
79 /* is it already there? */
80 if (!overwrite && openpam_findenv(pamh, name, strlen(name)) >= 0)
81 RETURNC(PAM_SUCCESS);
82
83 /* set it... */
84 if (asprintf(&env, "%s=%s", name, value) < 0)
85 RETURNC(PAM_BUF_ERR);
86 r = pam_putenv(pamh, env);
87 FREE(env);
88 RETURNC(r);
89 }
90
91 /*
92 * Error codes:
93 *
94 * =pam_putenv
95 * PAM_SYSTEM_ERR
96 * PAM_BUF_ERR
97 */
98
99 /**
100 * The =pam_setenv function sets an environment variable.
101 * Its semantics are similar to those of =setenv, but it modifies the PAM
102 * context's environment list instead of the application's.
103 *
104 * >pam_getenv
105 * >pam_getenvlist
106 * >pam_putenv
107 */
108