1 /*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2023 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
36 #ifdef HAVE_CONFIG_H
37 # include "config.h"
38 #endif
39
40 #include <sys/param.h>
41
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45
46 #include <security/pam_appl.h>
47
48 #include "openpam_impl.h"
49 #include "openpam_asprintf.h"
50
51 /*
52 * OpenPAM extension
53 *
54 * Sets the value of a module option
55 */
56
57 int
openpam_set_option(pam_handle_t * pamh,const char * option,const char * value)58 openpam_set_option(pam_handle_t *pamh,
59 const char *option,
60 const char *value)
61 {
62 pam_chain_t *cur;
63 char *opt, **optv;
64 size_t len;
65 int i;
66
67 ENTERS(option);
68 if (pamh == NULL || pamh->current == NULL || option == NULL)
69 RETURNC(PAM_SYSTEM_ERR);
70 cur = pamh->current;
71 for (len = 0; option[len] != '\0'; ++len)
72 if (option[len] == '=')
73 break;
74 for (i = 0; i < cur->optc; ++i) {
75 if (strncmp(cur->optv[i], option, len) == 0 &&
76 (cur->optv[i][len] == '\0' || cur->optv[i][len] == '='))
77 break;
78 }
79 if (value == NULL) {
80 /* remove */
81 if (i == cur->optc)
82 RETURNC(PAM_SUCCESS);
83 for (free(cur->optv[i]); i < cur->optc; ++i)
84 cur->optv[i] = cur->optv[i + 1];
85 cur->optv[i] = NULL;
86 --cur->optc;
87 RETURNC(PAM_SUCCESS);
88 }
89 if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0)
90 RETURNC(PAM_BUF_ERR);
91 if (i == cur->optc) {
92 /* add */
93 optv = realloc(cur->optv, sizeof(char *) * (cur->optc + 2));
94 if (optv == NULL) {
95 FREE(opt);
96 RETURNC(PAM_BUF_ERR);
97 }
98 optv[i] = opt;
99 optv[i + 1] = NULL;
100 cur->optv = optv;
101 ++cur->optc;
102 } else {
103 /* replace */
104 FREE(cur->optv[i]);
105 cur->optv[i] = opt;
106 }
107 RETURNC(PAM_SUCCESS);
108 }
109
110 /*
111 * Error codes:
112 *
113 * PAM_SYSTEM_ERR
114 * PAM_BUF_ERR
115 */
116
117 /**
118 * The =openpam_set_option function sets the specified option in the
119 * context of the currently executing service module.
120 *
121 * >openpam_get_option
122 */
123