source: openpam/trunk/lib/pam_get_authtok.c @ 235

Last change on this file since 235 was 235, checked in by des, 12 years ago

No need to explicitly clear pointers now that we use FREE().

File size: 5.1 KB
Line 
1/*-
2 * Copyright (c) 2002,2003 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * Network Associates Laboratories, the Security Research Division of
7 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
8 * ("CBOSS"), as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $P4: //depot/projects/openpam/lib/pam_get_authtok.c#24 $
35 */
36
37#include <sys/param.h>
38
39#include <stdlib.h>
40#include <string.h>
41
42#include <security/pam_appl.h>
43#include <security/openpam.h>
44
45#include "openpam_impl.h"
46
47const char authtok_prompt[] = "Password:";
48const char oldauthtok_prompt[] = "Old Password:";
49const char newauthtok_prompt[] = "New Password:";
50
51/*
52 * OpenPAM extension
53 *
54 * Retrieve authentication token
55 */
56
57int
58pam_get_authtok(pam_handle_t *pamh,
59        int item,
60        const char **authtok,
61        const char *prompt)
62{
63        const void *oldauthtok;
64        const char *default_prompt;
65        char *resp, *resp2;
66        int pitem, r, style, twice;
67
68        ENTER();
69        if (pamh == NULL || authtok == NULL)
70                RETURNC(PAM_SYSTEM_ERR);
71        *authtok = NULL;
72        twice = 0;
73        switch (item) {
74        case PAM_AUTHTOK:
75                pitem = PAM_AUTHTOK_PROMPT;
76                default_prompt = authtok_prompt;
77                r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok);
78                if (r == PAM_SUCCESS && oldauthtok != NULL) {
79                        default_prompt = newauthtok_prompt;
80                        twice = 1;
81                }
82                break;
83        case PAM_OLDAUTHTOK:
84                pitem = PAM_OLDAUTHTOK_PROMPT;
85                default_prompt = oldauthtok_prompt;
86                twice = 0;
87                break;
88        default:
89                RETURNC(PAM_SYMBOL_ERR);
90        }
91        if (openpam_get_option(pamh, "try_first_pass") ||
92            openpam_get_option(pamh, "use_first_pass")) {
93                r = pam_get_item(pamh, item, (const void **)authtok);
94                if (r == PAM_SUCCESS && *authtok != NULL)
95                        RETURNC(PAM_SUCCESS);
96                else if (openpam_get_option(pamh, "use_first_pass"))
97                        RETURNC(r == PAM_SUCCESS ? PAM_AUTH_ERR : r);
98        }
99        if (prompt == NULL) {
100                r = pam_get_item(pamh, pitem, (const void **)&prompt);
101                if (r != PAM_SUCCESS || prompt == NULL)
102                        prompt = default_prompt;
103        }
104        style = openpam_get_option(pamh, "echo_pass") ?
105            PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
106        r = pam_prompt(pamh, style, &resp, "%s", prompt);
107        if (r != PAM_SUCCESS)
108                RETURNC(r);
109        if (twice) {
110                r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt);
111                if (r != PAM_SUCCESS) {
112                        FREE(resp);
113                        RETURNC(r);
114                }
115                if (strcmp(resp, resp2) != 0)
116                        FREE(resp);
117                FREE(resp2);
118        }
119        if (resp == NULL)
120                RETURNC(PAM_TRY_AGAIN);
121        r = pam_set_item(pamh, item, resp);
122        FREE(resp);
123        if (r != PAM_SUCCESS)
124                RETURNC(r);
125        r = pam_get_item(pamh, item, (const void **)authtok);
126        RETURNC(r);
127}
128
129/*
130 * Error codes:
131 *
132 *      =pam_get_item
133 *      =pam_prompt
134 *      =pam_set_item
135 *      !PAM_SYMBOL_ERR
136 *      PAM_TRY_AGAIN
137 */
138
139/**
140 * The =pam_get_authtok function returns the cached authentication token,
141 * or prompts the user if no token is currently cached.  Either way, a
142 * pointer to the authentication token is stored in the location pointed
143 * to by the =authtok argument.
144 *
145 * The =item argument must have one of the following values:
146 *
147 *      =PAM_AUTHTOK:
148 *              Returns the current authentication token, or the new token
149 *              when changing authentication tokens.
150 *      =PAM_OLDAUTHTOK:
151 *              Returns the previous authentication token when changing
152 *              authentication tokens.
153 *
154 * The =prompt argument specifies a prompt to use if no token is cached.
155 * If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item,
156 * as appropriate, will be used.  If that item is also =NULL, a hardcoded
157 * default prompt will be used.
158 *
159 * If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK
160 * item, =pam_get_authtok will ask the user to confirm the new token by
161 * retyping it.  If there is a mismatch, =pam_get_authtok will return
162 * =PAM_TRY_AGAIN.
163 *
164 * >pam_get_item
165 * >pam_get_user
166 */
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