pam_setenv.c revision 348980 
1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2017 Dag-Erling Sm��rgrav
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by ThinkSec AS and
7 * Network Associates Laboratories, the Security Research Division of
8 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
9 * ("CBOSS"), as part of the DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $OpenPAM: pam_setenv.c 938 2017-04-30 21:34:42Z des $
36 */
37
38#ifdef HAVE_CONFIG_H
39# include "config.h"
40#endif
41
42#include <errno.h>
43#include <stdlib.h>
44#include <stdio.h>
45#include <string.h>
46
47#include <security/pam_appl.h>
48
49#include "openpam_impl.h"
50#include "openpam_asprintf.h"
51
52/*
53 * OpenPAM extension
54 *
55 * Set the value of an environment variable
56 * Mirrors setenv(3)
57 */
58
59int
60pam_setenv(pam_handle_t *pamh,
61	const char *name,
62	const char *value,
63	int overwrite)
64{
65	char *env;
66	int r;
67
68	ENTER();
69
70	/* sanity checks */
71	if (*name == '\0' || strchr(name, '=') != NULL) {
72		errno = EINVAL;
73		RETURNC(PAM_SYSTEM_ERR);
74	}
75
76	/* is it already there? */
77	if (!overwrite && openpam_findenv(pamh, name, strlen(name)) >= 0)
78		RETURNC(PAM_SUCCESS);
79
80	/* set it... */
81	if (asprintf(&env, "%s=%s", name, value) < 0)
82		RETURNC(PAM_BUF_ERR);
83	r = pam_putenv(pamh, env);
84	FREE(env);
85	RETURNC(r);
86}
87
88/*
89 * Error codes:
90 *
91 *	=pam_putenv
92 *	PAM_SYSTEM_ERR
93 *	PAM_BUF_ERR
94 */
95
96/**
97 * The =pam_setenv function sets an environment variable.
98 * Its semantics are similar to those of =setenv, but it modifies the PAM
99 * context's environment list instead of the application's.
100 *
101 * >pam_getenv
102 * >pam_getenvlist
103 * >pam_putenv
104 */
105