1 /* $NetBSD: pam_putenv.c,v 1.5 2023/06/30 21:46:21 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
5 * Copyright (c) 2004-2017 Dag-Erling Smørgrav
6 * All rights reserved.
7 *
8 * This software was developed for the FreeBSD Project by ThinkSec AS and
9 * Network Associates Laboratories, the Security Research Division of
10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
11 * ("CBOSS"), as part of the DARPA CHATS research program.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote
22 * products derived from this software without specific prior written
23 * permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #ifdef HAVE_CONFIG_H
39 # include "config.h"
40 #endif
41
42 #include <sys/cdefs.h>
43 __RCSID("$NetBSD: pam_putenv.c,v 1.5 2023/06/30 21:46:21 christos Exp $");
44
45 #include <errno.h>
46 #include <stdlib.h>
47 #include <string.h>
48
49 #include <security/pam_appl.h>
50
51 #include "openpam_impl.h"
52
53 /*
54 * XSSO 4.2.1
55 * XSSO 6 page 56
56 *
57 * Set the value of an environment variable
58 */
59
60 int
pam_putenv(pam_handle_t * pamh,const char * namevalue)61 pam_putenv(pam_handle_t *pamh,
62 const char *namevalue)
63 {
64 char **env;
65 const char *p;
66 size_t env_size;
67 int i;
68
69 ENTER();
70
71 /* sanity checks */
72 if ((p = strchr(namevalue, '=')) == NULL) {
73 errno = EINVAL;
74 RETURNC(PAM_SYSTEM_ERR);
75 }
76
77 /* see if the variable is already in the environment */
78 if ((i = openpam_findenv(pamh, namevalue,
79 (size_t)(p - namevalue))) >= 0) {
80 char *q;
81 if ((q = strdup(namevalue)) == NULL)
82 RETURNC(PAM_BUF_ERR);
83 FREE(pamh->env[i]);
84 pamh->env[i] = q;
85 RETURNC(PAM_SUCCESS);
86 }
87
88 /* grow the environment list if necessary */
89 if (pamh->env_count == pamh->env_size) {
90 env_size = pamh->env_size * 2 + 1;
91 env = realloc(pamh->env, sizeof(*env) * env_size);
92 if (env == NULL)
93 RETURNC(PAM_BUF_ERR);
94 pamh->env = env;
95 pamh->env_size = env_size;
96 }
97
98 /* add the variable at the end */
99 if ((pamh->env[pamh->env_count] = strdup(namevalue)) == NULL)
100 RETURNC(PAM_BUF_ERR);
101 ++pamh->env_count;
102 RETURNC(PAM_SUCCESS);
103 }
104
105 /*
106 * Error codes:
107 *
108 * PAM_SYSTEM_ERR
109 * PAM_BUF_ERR
110 */
111
112 /**
113 * The =pam_putenv function sets an environment variable.
114 * Its semantics are similar to those of =putenv, but it modifies the PAM
115 * context's environment list instead of the application's.
116 *
117 * >pam_getenv
118 * >pam_getenvlist
119 * >pam_setenv
120 */
121