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 * $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
59 int
openpam_set_option(pam_handle_t * pamh,const char * option,const char * value)60 openpam_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