1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 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 * $OpenPAM: openpam_set_option.c 938 2017-04-30 21:34:42Z des $
36 */
37
38#ifdef HAVE_CONFIG_H
39# include "config.h"
40#endif
41
42#include <sys/param.h>
43
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47
48#include <security/pam_appl.h>
49
50#include "openpam_impl.h"
51#include "openpam_asprintf.h"
52
53/*
54 * OpenPAM extension
55 *
56 * Sets the value of a module option
57 */
58
59int
60openpam_set_option(pam_handle_t *pamh,
61	const char *option,
62	const char *value)
63{
64	pam_chain_t *cur;
65	char *opt, **optv;
66	size_t len;
67	int i;
68
69	ENTERS(option);
70	if (pamh == NULL || pamh->current == NULL || option == NULL)
71		RETURNC(PAM_SYSTEM_ERR);
72	cur = pamh->current;
73	for (len = 0; option[len] != '\0'; ++len)
74		if (option[len] == '=')
75			break;
76	for (i = 0; i < cur->optc; ++i) {
77		if (strncmp(cur->optv[i], option, len) == 0 &&
78		    (cur->optv[i][len] == '\0' || cur->optv[i][len] == '='))
79			break;
80	}
81	if (value == NULL) {
82		/* remove */
83		if (i == cur->optc)
84			RETURNC(PAM_SUCCESS);
85		for (free(cur->optv[i]); i < cur->optc; ++i)
86			cur->optv[i] = cur->optv[i + 1];
87		cur->optv[i] = NULL;
88		RETURNC(PAM_SUCCESS);
89	}
90	if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0)
91		RETURNC(PAM_BUF_ERR);
92	if (i == cur->optc) {
93		/* add */
94		optv = realloc(cur->optv, sizeof(char *) * (cur->optc + 2));
95		if (optv == NULL) {
96			FREE(opt);
97			RETURNC(PAM_BUF_ERR);
98		}
99		optv[i] = opt;
100		optv[i + 1] = NULL;
101		cur->optv = optv;
102		++cur->optc;
103	} else {
104		/* replace */
105		FREE(cur->optv[i]);
106		cur->optv[i] = opt;
107	}
108	RETURNC(PAM_SUCCESS);
109}
110
111/*
112 * Error codes:
113 *
114 *	PAM_SYSTEM_ERR
115 *	PAM_BUF_ERR
116 */
117
118/**
119 * The =openpam_set_option function sets the specified option in the
120 * context of the currently executing service module.
121 *
122 * >openpam_get_option
123 */
124