1 /* $NetBSD: openpam_set_option.c,v 1.4 2023/06/30 21:46:20 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
5 * Copyright (c) 2004-2023 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: openpam_set_option.c,v 1.4 2023/06/30 21:46:20 christos Exp $");
44
45 #include <sys/param.h>
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50
51 #include <security/pam_appl.h>
52
53 #include "openpam_impl.h"
54 #include "openpam_asprintf.h"
55
56 /*
57 * OpenPAM extension
58 *
59 * Sets the value of a module option
60 */
61
62 int
openpam_set_option(pam_handle_t * pamh,const char * option,const char * value)63 openpam_set_option(pam_handle_t *pamh,
64 const char *option,
65 const char *value)
66 {
67 pam_chain_t *cur;
68 char *opt, **optv;
69 size_t len;
70 int i;
71
72 ENTERS(option);
73 if (pamh == NULL || pamh->current == NULL || option == NULL)
74 RETURNC(PAM_SYSTEM_ERR);
75 cur = pamh->current;
76 for (len = 0; option[len] != '\0'; ++len)
77 if (option[len] == '=')
78 break;
79 for (i = 0; i < cur->optc; ++i) {
80 if (strncmp(cur->optv[i], option, len) == 0 &&
81 (cur->optv[i][len] == '\0' || cur->optv[i][len] == '='))
82 break;
83 }
84 if (value == NULL) {
85 /* remove */
86 if (i == cur->optc)
87 RETURNC(PAM_SUCCESS);
88 for (free(cur->optv[i]); i < cur->optc; ++i)
89 cur->optv[i] = cur->optv[i + 1];
90 cur->optv[i] = NULL;
91 --cur->optc;
92 RETURNC(PAM_SUCCESS);
93 }
94 if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0)
95 RETURNC(PAM_BUF_ERR);
96 if (i == cur->optc) {
97 /* add */
98 optv = realloc(cur->optv,
99 sizeof(*optv) * ((size_t)cur->optc + 2));
100 if (optv == NULL) {
101 FREE(opt);
102 RETURNC(PAM_BUF_ERR);
103 }
104 optv[i] = opt;
105 optv[i + 1] = NULL;
106 cur->optv = optv;
107 ++cur->optc;
108 } else {
109 /* replace */
110 FREE(cur->optv[i]);
111 cur->optv[i] = opt;
112 }
113 RETURNC(PAM_SUCCESS);
114 }
115
116 /*
117 * Error codes:
118 *
119 * PAM_SYSTEM_ERR
120 * PAM_BUF_ERR
121 */
122
123 /**
124 * The =openpam_set_option function sets the specified option in the
125 * context of the currently executing service module.
126 *
127 * >openpam_get_option
128 */
129