xref: /freebsd/contrib/openpam/lib/libpam/pam_putenv.c (revision a5921bc3653e2e286715e6fe8d473ec0d02da38c)
1 /*-
2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3  * Copyright (c) 2004-2011 Dag-Erling Smørgrav
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 648 2013-03-05 17:54:27Z des $
36  */
37 
38 #ifdef HAVE_CONFIG_H
39 # include "config.h"
40 #endif
41 
42 #include <stdlib.h>
43 #include <string.h>
44 
45 #include <security/pam_appl.h>
46 
47 #include "openpam_impl.h"
48 
49 /*
50  * XSSO 4.2.1
51  * XSSO 6 page 56
52  *
53  * Set the value of an environment variable
54  */
55 
56 int
57 pam_putenv(pam_handle_t *pamh,
58 	const char *namevalue)
59 {
60 	char **env, *p;
61 	int i;
62 
63 	ENTER();
64 	if (pamh == NULL)
65 		RETURNC(PAM_SYSTEM_ERR);
66 
67 	/* sanity checks */
68 	if (namevalue == NULL || (p = strchr(namevalue, '=')) == NULL)
69 		RETURNC(PAM_SYSTEM_ERR);
70 
71 	/* see if the variable is already in the environment */
72 	if ((i = openpam_findenv(pamh, namevalue, p - namevalue)) >= 0) {
73 		if ((p = strdup(namevalue)) == NULL)
74 			RETURNC(PAM_BUF_ERR);
75 		FREE(pamh->env[i]);
76 		pamh->env[i] = p;
77 		RETURNC(PAM_SUCCESS);
78 	}
79 
80 	/* grow the environment list if necessary */
81 	if (pamh->env_count == pamh->env_size) {
82 		env = realloc(pamh->env,
83 		    sizeof(char *) * (pamh->env_size * 2 + 1));
84 		if (env == NULL)
85 			RETURNC(PAM_BUF_ERR);
86 		pamh->env = env;
87 		pamh->env_size = pamh->env_size * 2 + 1;
88 	}
89 
90 	/* add the variable at the end */
91 	if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
92 		RETURNC(PAM_BUF_ERR);
93 	++pamh->env_count;
94 	RETURNC(PAM_SUCCESS);
95 }
96 
97 /*
98  * Error codes:
99  *
100  *	PAM_SYSTEM_ERR
101  *	PAM_BUF_ERR
102  */
103 
104 /**
105  * The =pam_putenv function sets an environment variable.
106  * Its semantics are similar to those of =putenv, but it modifies the PAM
107  * context's environment list instead of the application's.
108  *
109  * >pam_getenv
110  * >pam_getenvlist
111  * >pam_setenv
112  */
113