pam_putenv.c revision 99158 
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#8 $
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	if (pamh == NULL)
59		return (PAM_SYSTEM_ERR);
60
61	/* sanity checks */
62	if (namevalue == NULL || (p = strchr(namevalue, '=')) == NULL)
63		return (PAM_SYSTEM_ERR);
64
65	/* see if the variable is already in the environment */
66	if ((i = openpam_findenv(pamh, namevalue, p - namevalue)) != -1) {
67		if ((p = strdup(namevalue)) == NULL)
68			return (PAM_BUF_ERR);
69		free(pamh->env[i]);
70		pamh->env[i] = p;
71		return (PAM_SUCCESS);
72	}
73
74	/* grow the environment list if necessary */
75	if (pamh->env_count == pamh->env_size) {
76		env = realloc(pamh->env,
77		    sizeof(char *) * (pamh->env_size * 2 + 1));
78		if (env == NULL)
79			return (PAM_BUF_ERR);
80		pamh->env = env;
81		pamh->env_size = pamh->env_size * 2 + 1;
82	}
83
84	/* add the variable at the end */
85	if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
86		return (PAM_BUF_ERR);
87	++pamh->env_count;
88	return (PAM_SUCCESS);
89}
90
91/*
92 * Error codes:
93 *
94 *	PAM_SYSTEM_ERR
95 *	PAM_BUF_ERR
96 */
97
98/**
99 * The =pam_putenv function sets a environment variable.
100 * Its semantics are similar to those of =putenv, but it modifies the PAM
101 * context's environment list instead of the application's.
102 *
103 * >pam_getenv
104 * >pam_getenvlist
105 * >pam_setenv
106 */
107