pam_putenv.c revision 186063 
1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2007 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 * $Id: pam_putenv.c 408 2007-12-21 11:36:24Z des $
36 */
37
38#include <stdlib.h>
39#include <string.h>
40
41#include <security/pam_appl.h>
42
43#include "openpam_impl.h"
44
45/*
46 * XSSO 4.2.1
47 * XSSO 6 page 56
48 *
49 * Set the value of an environment variable
50 */
51
52int
53pam_putenv(pam_handle_t *pamh,
54	const char *namevalue)
55{
56	char **env, *p;
57	int i;
58
59	ENTER();
60	if (pamh == NULL)
61		RETURNC(PAM_SYSTEM_ERR);
62
63	/* sanity checks */
64	if (namevalue == NULL || (p = strchr(namevalue, '=')) == NULL)
65		RETURNC(PAM_SYSTEM_ERR);
66
67	/* see if the variable is already in the environment */
68	if ((i = openpam_findenv(pamh, namevalue, p - namevalue)) >= 0) {
69		if ((p = strdup(namevalue)) == NULL)
70			RETURNC(PAM_BUF_ERR);
71		FREE(pamh->env[i]);
72		pamh->env[i] = p;
73		RETURNC(PAM_SUCCESS);
74	}
75
76	/* grow the environment list if necessary */
77	if (pamh->env_count == pamh->env_size) {
78		env = realloc(pamh->env,
79		    sizeof(char *) * (pamh->env_size * 2 + 1));
80		if (env == NULL)
81			RETURNC(PAM_BUF_ERR);
82		pamh->env = env;
83		pamh->env_size = pamh->env_size * 2 + 1;
84	}
85
86	/* add the variable at the end */
87	if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
88		RETURNC(PAM_BUF_ERR);
89	++pamh->env_count;
90	RETURNC(PAM_SUCCESS);
91}
92
93/*
94 * Error codes:
95 *
96 *	PAM_SYSTEM_ERR
97 *	PAM_BUF_ERR
98 */
99
100/**
101 * The =pam_putenv function sets a environment variable.
102 * Its semantics are similar to those of =putenv, but it modifies the PAM
103 * context's environment list instead of the application's.
104 *
105 * >pam_getenv
106 * >pam_getenvlist
107 * >pam_setenv
108 */
109