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

Last change on this file since 232 was 232, checked in by des, 11 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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