source: openpam/trunk/lib/pam_get_authtok.c @ 132

Last change on this file since 132 was 132, checked in by Dag-Erling Smørgrav, 19 years ago

Add colons so gendoc recognizes this as a list rather than a literal
section.

Sponsored by: DARPA, NAI Labs

File size: 5.1 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * 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#17 $
35 */
36
37#include <sys/param.h>
38
39#include <stdlib.h>
40
41#include <security/pam_appl.h>
42#include <security/openpam.h>
43
44#include "openpam_impl.h"
45
46const char authtok_prompt[] = "Password:";
47const char oldauthtok_prompt[] = "Old Password:";
48const char newauthtok_prompt[] = "New Password:";
49
50/*
51 * OpenPAM extension
52 *
53 * Retrieve authentication token
54 */
55
56int
57pam_get_authtok(pam_handle_t *pamh,
58        int item,
59        const char **authtok,
60        const char *prompt)
61{
62        const void *oldauthtok;
63        const char *default_prompt;
64        char *resp, *resp2;
65        int pitem, r, style, twice;
66
67        if (pamh == NULL || authtok == NULL)
68                return (PAM_SYSTEM_ERR);
69
70        *authtok = NULL;
71        twice = 0;
72        switch (item) {
73        case PAM_AUTHTOK:
74                pitem = PAM_AUTHTOK_PROMPT;
75                default_prompt = authtok_prompt;
76                r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok);
77                if (r == PAM_SUCCESS && oldauthtok != NULL) {
78                        default_prompt = newauthtok_prompt;
79                        twice = 1;
80                }
81                break;
82        case PAM_OLDAUTHTOK:
83                pitem = PAM_OLDAUTHTOK_PROMPT;
84                default_prompt = oldauthtok_prompt;
85                twice = 0;
86                break;
87        default:
88                return (PAM_SYMBOL_ERR);
89        }
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                        return (PAM_SUCCESS);
96                else if (openpam_get_option(pamh, "use_first_pass"))
97                        return (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                return (r);
109        if (twice) {
110                r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt);
111                if (r != PAM_SUCCESS) {
112                        free(resp);
113                        return (r);
114                }
115                if (strcmp(resp, resp2) != 0) {
116                        free(resp);
117                        resp = NULL;
118                }
119                free(resp2);
120        }
121        if (resp == NULL)
122                return (PAM_TRY_AGAIN);
123        r = pam_set_item(pamh, item, resp);
124        free(resp);
125        if (r != PAM_SUCCESS)
126                return (r);
127        return (pam_get_item(pamh, item, (const void **)authtok));
128}
129
130/*
131 * Error codes:
132 *
133 *      =pam_get_item
134 *      =pam_prompt
135 *      =pam_set_item
136 *      !PAM_SYMBOL_ERR
137 *      PAM_TRY_AGAIN
138 */
139
140/**
141 * The =pam_get_authtok function returns the cached authentication token,
142 * or prompts the user if no token is currently cached.  Either way, a
143 * pointer to the authentication token is stored in the location pointed
144 * to by the =authtok argument.
145 *
146 * The =item argument must have one of the following values:
147 *
148 *      =PAM_AUTHTOK:
149 *              Returns the current authentication token, or the new token
150 *              when changing authentication tokens.
151 *      =PAM_OLDAUTHTOK:
152 *              Returns the previous authentication token when changing
153 *              authentication tokens.
154 *
155 * The =prompt argument specifies a prompt to use if no token is cached.
156 * If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item,
157 * as appropriate, will be used.  If that item is also =NULL, a hardcoded
158 * default prompt will be used.
159 *
160 * If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK
161 * item, =pam_get_authtok will ask the user to confirm the new token by
162 * retyping it.  If there is a mismatch, =pam_get_authtok will return
163 * =PAM_TRY_AGAIN.
164 *
165 * >pam_get_item
166 * >pam_get_user
167 */
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