1/*	$NetBSD: pam_putenv.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) 2004-2017 Dag-Erling Sm��rgrav
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_putenv.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 56
56 *
57 * Set the value of an environment variable
58 */
59
60int
61pam_putenv(pam_handle_t *pamh,
62	const char *namevalue)
63{
64	char **env;
65	const char *p;
66	size_t env_size;
67	int i;
68
69	ENTER();
70
71	/* sanity checks */
72	if ((p = strchr(namevalue, '=')) == NULL) {
73		errno = EINVAL;
74		RETURNC(PAM_SYSTEM_ERR);
75	}
76
77	/* see if the variable is already in the environment */
78	if ((i = openpam_findenv(pamh, namevalue,
79	    (size_t)(p - namevalue))) >= 0) {
80		char *q;
81		if ((q = strdup(namevalue)) == NULL)
82			RETURNC(PAM_BUF_ERR);
83		FREE(pamh->env[i]);
84		pamh->env[i] = q;
85		RETURNC(PAM_SUCCESS);
86	}
87
88	/* grow the environment list if necessary */
89	if (pamh->env_count == pamh->env_size) {
90		env_size = pamh->env_size * 2 + 1;
91		env = realloc(pamh->env, sizeof(*env) * env_size);
92		if (env == NULL)
93			RETURNC(PAM_BUF_ERR);
94		pamh->env = env;
95		pamh->env_size = env_size;
96	}
97
98	/* add the variable at the end */
99	if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
100		RETURNC(PAM_BUF_ERR);
101	++pamh->env_count;
102	RETURNC(PAM_SUCCESS);
103}
104
105/*
106 * Error codes:
107 *
108 *	PAM_SYSTEM_ERR
109 *	PAM_BUF_ERR
110 */
111
112/**
113 * The =pam_putenv function sets an environment variable.
114 * Its semantics are similar to those of =putenv, but it modifies the PAM
115 * context's environment list instead of the application's.
116 *
117 * >pam_getenv
118 * >pam_getenvlist
119 * >pam_setenv
120 */
121