source: openpam/trunk/lib/pam_putenv.c @ 232

Last change on this file since 232 was 232, checked in by Dag-Erling Smørgrav, 15 years ago

With one single exception (where the pointer is obviously being
immediately overwritten), replace all use of free(3) with a macro
that clears the pointer after freeing the memory it pointed to.

Suggested by: Dmitry V. Levin <ldv@…>

File size: 3.3 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * Network Associates Laboratories, the Security Research Division of
7 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
8 * ("CBOSS"), as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $P4: //depot/projects/openpam/lib/pam_putenv.c#10 $
35 */
36
37#include <stdlib.h>
38#include <string.h>
39
40#include <security/pam_appl.h>
41
42#include "openpam_impl.h"
43
44/*
45 * XSSO 4.2.1
46 * XSSO 6 page 56
47 *
48 * Set the value of an environment variable
49 */
50
51int
52pam_putenv(pam_handle_t *pamh,
53        const char *namevalue)
54{
55        char **env, *p;
56        int i;
57
58        ENTER();
59        if (pamh == NULL)
60                RETURNC(PAM_SYSTEM_ERR);
61
62        /* sanity checks */
63        if (namevalue == NULL || (p = strchr(namevalue, '=')) == NULL)
64                RETURNC(PAM_SYSTEM_ERR);
65
66        /* see if the variable is already in the environment */
67        if ((i = openpam_findenv(pamh, namevalue, p - namevalue)) != -1) {
68                if ((p = strdup(namevalue)) == NULL)
69                        RETURNC(PAM_BUF_ERR);
70                FREE(pamh->env[i]);
71                pamh->env[i] = p;
72                RETURNC(PAM_SUCCESS);
73        }
74
75        /* grow the environment list if necessary */
76        if (pamh->env_count == pamh->env_size) {
77                env = realloc(pamh->env,
78                    sizeof(char *) * (pamh->env_size * 2 + 1));
79                if (env == NULL)
80                        RETURNC(PAM_BUF_ERR);
81                pamh->env = env;
82                pamh->env_size = pamh->env_size * 2 + 1;
83        }
84
85        /* add the variable at the end */
86        if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
87                RETURNC(PAM_BUF_ERR);
88        ++pamh->env_count;
89        RETURNC(PAM_SUCCESS);
90}
91
92/*
93 * Error codes:
94 *
95 *      PAM_SYSTEM_ERR
96 *      PAM_BUF_ERR
97 */
98
99/**
100 * The =pam_putenv function sets a environment variable.
101 * Its semantics are similar to those of =putenv, but it modifies the PAM
102 * context's environment list instead of the application's.
103 *
104 * >pam_getenv
105 * >pam_getenvlist
106 * >pam_setenv
107 */
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