1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*-
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by ThinkSec AS and
* Network Associates Laboratories, the Security Research Division of
* Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $P4: //depot/projects/openpam/lib/pam_get_authtok.c#20 $
*/
#include <sys/param.h>
#include <stdlib.h>
#include <string.h>
#include <security/pam_appl.h>
#include <security/openpam.h>
#include "openpam_impl.h"
const char authtok_prompt[] = "Password:";
const char oldauthtok_prompt[] = "Old Password:";
const char newauthtok_prompt[] = "New Password:";
/*
* OpenPAM extension
*
* Retrieve authentication token
*/
int
pam_get_authtok(pam_handle_t *pamh,
int item,
const char **authtok,
const char *prompt)
{
const void *oldauthtok;
const char *default_prompt;
char *resp, *resp2;
int pitem, r, style, twice;
ENTER();
if (pamh == NULL || authtok == NULL)
RETURNC(PAM_SYSTEM_ERR);
*authtok = NULL;
twice = 0;
switch (item) {
case PAM_AUTHTOK:
pitem = PAM_AUTHTOK_PROMPT;
default_prompt = authtok_prompt;
r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok);
if (r == PAM_SUCCESS && oldauthtok != NULL) {
default_prompt = newauthtok_prompt;
twice = 1;
}
break;
case PAM_OLDAUTHTOK:
pitem = PAM_OLDAUTHTOK_PROMPT;
default_prompt = oldauthtok_prompt;
twice = 0;
break;
default:
RETURNC(PAM_SYMBOL_ERR);
}
if (openpam_get_option(pamh, "try_first_pass") ||
openpam_get_option(pamh, "use_first_pass")) {
r = pam_get_item(pamh, item, (const void **)authtok);
if (r == PAM_SUCCESS && *authtok != NULL)
RETURNC(PAM_SUCCESS);
else if (openpam_get_option(pamh, "use_first_pass"))
RETURNC(r == PAM_SUCCESS ? PAM_AUTH_ERR : r);
}
if (prompt == NULL) {
r = pam_get_item(pamh, pitem, (const void **)&prompt);
if (r != PAM_SUCCESS || prompt == NULL)
prompt = default_prompt;
}
style = openpam_get_option(pamh, "echo_pass") ?
PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
r = pam_prompt(pamh, style, &resp, "%s", prompt);
if (r != PAM_SUCCESS)
RETURNC(r);
if (twice) {
r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt);
if (r != PAM_SUCCESS) {
free(resp);
RETURNC(r);
}
if (strcmp(resp, resp2) != 0) {
free(resp);
resp = NULL;
}
free(resp2);
}
if (resp == NULL)
RETURNC(PAM_TRY_AGAIN);
r = pam_set_item(pamh, item, resp);
free(resp);
if (r != PAM_SUCCESS)
RETURNC(r);
RETURNC(pam_get_item(pamh, item, (const void **)authtok));
}
/*
* Error codes:
*
* =pam_get_item
* =pam_prompt
* =pam_set_item
* !PAM_SYMBOL_ERR
* PAM_TRY_AGAIN
*/
/**
* The =pam_get_authtok function returns the cached authentication token,
* or prompts the user if no token is currently cached. Either way, a
* pointer to the authentication token is stored in the location pointed
* to by the =authtok argument.
*
* The =item argument must have one of the following values:
*
* =PAM_AUTHTOK:
* Returns the current authentication token, or the new token
* when changing authentication tokens.
* =PAM_OLDAUTHTOK:
* Returns the previous authentication token when changing
* authentication tokens.
*
* The =prompt argument specifies a prompt to use if no token is cached.
* If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item,
* as appropriate, will be used. If that item is also =NULL, a hardcoded
* default prompt will be used.
*
* If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK
* item, =pam_get_authtok will ask the user to confirm the new token by
* retyping it. If there is a mismatch, =pam_get_authtok will return
* =PAM_TRY_AGAIN.
*
* >pam_get_item
* >pam_get_user
*/
|