1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav
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 *
| 1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav
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 * $Id: pam_get_authtok.c 455 2011-10-29 18:31:11Z des $
| 35 * $Id: pam_get_authtok.c 510 2011-12-31 13:14:23Z des $
|
36 */
37
38#ifdef HAVE_CONFIG_H
39# include "config.h"
40#endif
41
42#include <sys/param.h>
43
44#include <stdlib.h>
45#include <string.h>
46
47#include <security/pam_appl.h>
48#include <security/openpam.h>
49
50#include "openpam_impl.h"
51
52static const char authtok_prompt[] = "Password:";
| 36 */
37
38#ifdef HAVE_CONFIG_H
39# include "config.h"
40#endif
41
42#include <sys/param.h>
43
44#include <stdlib.h>
45#include <string.h>
46
47#include <security/pam_appl.h>
48#include <security/openpam.h>
49
50#include "openpam_impl.h"
51
52static const char authtok_prompt[] = "Password:";
|
| 53static const char authtok_prompt_remote[] = "Password for %u@%h:";
|
53static const char oldauthtok_prompt[] = "Old Password:";
54static const char newauthtok_prompt[] = "New Password:";
55
56/*
57 * OpenPAM extension
58 *
59 * Retrieve authentication token
60 */
61
62int
63pam_get_authtok(pam_handle_t *pamh,
64 int item,
65 const char **authtok,
66 const char *prompt)
67{
68 char prompt_buf[1024];
69 size_t prompt_size;
70 const void *oldauthtok, *prevauthtok, *promptp;
71 const char *prompt_option, *default_prompt;
| 54static const char oldauthtok_prompt[] = "Old Password:";
55static const char newauthtok_prompt[] = "New Password:";
56
57/*
58 * OpenPAM extension
59 *
60 * Retrieve authentication token
61 */
62
63int
64pam_get_authtok(pam_handle_t *pamh,
65 int item,
66 const char **authtok,
67 const char *prompt)
68{
69 char prompt_buf[1024];
70 size_t prompt_size;
71 const void *oldauthtok, *prevauthtok, *promptp;
72 const char *prompt_option, *default_prompt;
|
| 73 const void *lhost, *rhost;
|
72 char *resp, *resp2;
73 int pitem, r, style, twice;
74
75 ENTER();
76 if (pamh == NULL || authtok == NULL)
77 RETURNC(PAM_SYSTEM_ERR);
78 *authtok = NULL;
79 twice = 0;
80 switch (item) {
81 case PAM_AUTHTOK:
82 pitem = PAM_AUTHTOK_PROMPT;
83 prompt_option = "authtok_prompt";
84 default_prompt = authtok_prompt;
| 74 char *resp, *resp2;
75 int pitem, r, style, twice;
76
77 ENTER();
78 if (pamh == NULL || authtok == NULL)
79 RETURNC(PAM_SYSTEM_ERR);
80 *authtok = NULL;
81 twice = 0;
82 switch (item) {
83 case PAM_AUTHTOK:
84 pitem = PAM_AUTHTOK_PROMPT;
85 prompt_option = "authtok_prompt";
86 default_prompt = authtok_prompt;
|
| 87 r = pam_get_item(pamh, PAM_RHOST, &rhost);
88 if (r == PAM_SUCCESS && rhost != NULL) {
89 r = pam_get_item(pamh, PAM_HOST, &lhost);
90 if (r == PAM_SUCCESS && lhost != NULL) {
91 if (strcmp(rhost, lhost) != 0)
92 default_prompt = authtok_prompt_remote;
93 }
94 }
|
85 r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok);
86 if (r == PAM_SUCCESS && oldauthtok != NULL) {
87 default_prompt = newauthtok_prompt;
88 twice = 1;
89 }
90 break;
91 case PAM_OLDAUTHTOK:
92 pitem = PAM_OLDAUTHTOK_PROMPT;
93 prompt_option = "oldauthtok_prompt";
94 default_prompt = oldauthtok_prompt;
95 twice = 0;
96 break;
97 default:
98 RETURNC(PAM_SYMBOL_ERR);
99 }
100 if (openpam_get_option(pamh, "try_first_pass") ||
101 openpam_get_option(pamh, "use_first_pass")) {
102 r = pam_get_item(pamh, item, &prevauthtok);
103 if (r == PAM_SUCCESS && prevauthtok != NULL) {
104 *authtok = prevauthtok;
105 RETURNC(PAM_SUCCESS);
106 }
107 else if (openpam_get_option(pamh, "use_first_pass"))
108 RETURNC(r == PAM_SUCCESS ? PAM_AUTH_ERR : r);
109 }
110 /* pam policy overrides the module's choice */
111 if ((promptp = openpam_get_option(pamh, prompt_option)) != NULL)
112 prompt = promptp;
113 /* no prompt provided, see if there is one tucked away somewhere */
114 if (prompt == NULL)
115 if (pam_get_item(pamh, pitem, &promptp) && promptp != NULL)
116 prompt = promptp;
117 /* fall back to hardcoded default */
118 if (prompt == NULL)
119 prompt = default_prompt;
120 /* expand */
121 prompt_size = sizeof prompt_buf;
122 r = openpam_subst(pamh, prompt_buf, &prompt_size, prompt);
123 if (r == PAM_SUCCESS && prompt_size <= sizeof prompt_buf)
124 prompt = prompt_buf;
125 style = openpam_get_option(pamh, "echo_pass") ?
126 PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
127 r = pam_prompt(pamh, style, &resp, "%s", prompt);
128 if (r != PAM_SUCCESS)
129 RETURNC(r);
130 if (twice) {
131 r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt);
132 if (r != PAM_SUCCESS) {
133 FREE(resp);
134 RETURNC(r);
135 }
136 if (strcmp(resp, resp2) != 0)
137 FREE(resp);
138 FREE(resp2);
139 }
140 if (resp == NULL)
141 RETURNC(PAM_TRY_AGAIN);
142 r = pam_set_item(pamh, item, resp);
143 FREE(resp);
144 if (r != PAM_SUCCESS)
145 RETURNC(r);
146 r = pam_get_item(pamh, item, (const void **)authtok);
147 RETURNC(r);
148}
149
150/*
151 * Error codes:
152 *
153 * =pam_get_item
154 * =pam_prompt
155 * =pam_set_item
156 * !PAM_SYMBOL_ERR
157 * PAM_TRY_AGAIN
158 */
159
160/**
161 * The =pam_get_authtok function returns the cached authentication token,
162 * or prompts the user if no token is currently cached.
163 * Either way, a pointer to the authentication token is stored in the
164 * location pointed to by the =authtok argument.
165 *
166 * The =item argument must have one of the following values:
167 *
168 * =PAM_AUTHTOK:
169 * Returns the current authentication token, or the new token
170 * when changing authentication tokens.
171 * =PAM_OLDAUTHTOK:
172 * Returns the previous authentication token when changing
173 * authentication tokens.
174 *
175 * The =prompt argument specifies a prompt to use if no token is cached.
176 * If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item,
177 * as appropriate, will be used.
178 * If that item is also =NULL, a hardcoded default prompt will be used.
179 * Either way, the prompt is expanded using =openpam_subst before it is
180 * passed to the conversation function.
181 *
182 * If =pam_get_authtok is called from a module and the ;authtok_prompt /
183 * ;oldauthtok_prompt option is set in the policy file, the value of that
184 * option takes precedence over both the =prompt argument and the
185 * =PAM_AUTHTOK_PROMPT / =PAM_OLDAUTHTOK_PROMPT item.
186 *
187 * If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK
188 * item, =pam_get_authtok will ask the user to confirm the new token by
189 * retyping it.
190 * If there is a mismatch, =pam_get_authtok will return =PAM_TRY_AGAIN.
191 *
192 * >pam_get_item
193 * >pam_get_user
194 * >openpam_subst
195 */
| 95 r = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldauthtok);
96 if (r == PAM_SUCCESS && oldauthtok != NULL) {
97 default_prompt = newauthtok_prompt;
98 twice = 1;
99 }
100 break;
101 case PAM_OLDAUTHTOK:
102 pitem = PAM_OLDAUTHTOK_PROMPT;
103 prompt_option = "oldauthtok_prompt";
104 default_prompt = oldauthtok_prompt;
105 twice = 0;
106 break;
107 default:
108 RETURNC(PAM_SYMBOL_ERR);
109 }
110 if (openpam_get_option(pamh, "try_first_pass") ||
111 openpam_get_option(pamh, "use_first_pass")) {
112 r = pam_get_item(pamh, item, &prevauthtok);
113 if (r == PAM_SUCCESS && prevauthtok != NULL) {
114 *authtok = prevauthtok;
115 RETURNC(PAM_SUCCESS);
116 }
117 else if (openpam_get_option(pamh, "use_first_pass"))
118 RETURNC(r == PAM_SUCCESS ? PAM_AUTH_ERR : r);
119 }
120 /* pam policy overrides the module's choice */
121 if ((promptp = openpam_get_option(pamh, prompt_option)) != NULL)
122 prompt = promptp;
123 /* no prompt provided, see if there is one tucked away somewhere */
124 if (prompt == NULL)
125 if (pam_get_item(pamh, pitem, &promptp) && promptp != NULL)
126 prompt = promptp;
127 /* fall back to hardcoded default */
128 if (prompt == NULL)
129 prompt = default_prompt;
130 /* expand */
131 prompt_size = sizeof prompt_buf;
132 r = openpam_subst(pamh, prompt_buf, &prompt_size, prompt);
133 if (r == PAM_SUCCESS && prompt_size <= sizeof prompt_buf)
134 prompt = prompt_buf;
135 style = openpam_get_option(pamh, "echo_pass") ?
136 PAM_PROMPT_ECHO_ON : PAM_PROMPT_ECHO_OFF;
137 r = pam_prompt(pamh, style, &resp, "%s", prompt);
138 if (r != PAM_SUCCESS)
139 RETURNC(r);
140 if (twice) {
141 r = pam_prompt(pamh, style, &resp2, "Retype %s", prompt);
142 if (r != PAM_SUCCESS) {
143 FREE(resp);
144 RETURNC(r);
145 }
146 if (strcmp(resp, resp2) != 0)
147 FREE(resp);
148 FREE(resp2);
149 }
150 if (resp == NULL)
151 RETURNC(PAM_TRY_AGAIN);
152 r = pam_set_item(pamh, item, resp);
153 FREE(resp);
154 if (r != PAM_SUCCESS)
155 RETURNC(r);
156 r = pam_get_item(pamh, item, (const void **)authtok);
157 RETURNC(r);
158}
159
160/*
161 * Error codes:
162 *
163 * =pam_get_item
164 * =pam_prompt
165 * =pam_set_item
166 * !PAM_SYMBOL_ERR
167 * PAM_TRY_AGAIN
168 */
169
170/**
171 * The =pam_get_authtok function returns the cached authentication token,
172 * or prompts the user if no token is currently cached.
173 * Either way, a pointer to the authentication token is stored in the
174 * location pointed to by the =authtok argument.
175 *
176 * The =item argument must have one of the following values:
177 *
178 * =PAM_AUTHTOK:
179 * Returns the current authentication token, or the new token
180 * when changing authentication tokens.
181 * =PAM_OLDAUTHTOK:
182 * Returns the previous authentication token when changing
183 * authentication tokens.
184 *
185 * The =prompt argument specifies a prompt to use if no token is cached.
186 * If it is =NULL, the =PAM_AUTHTOK_PROMPT or =PAM_OLDAUTHTOK_PROMPT item,
187 * as appropriate, will be used.
188 * If that item is also =NULL, a hardcoded default prompt will be used.
189 * Either way, the prompt is expanded using =openpam_subst before it is
190 * passed to the conversation function.
191 *
192 * If =pam_get_authtok is called from a module and the ;authtok_prompt /
193 * ;oldauthtok_prompt option is set in the policy file, the value of that
194 * option takes precedence over both the =prompt argument and the
195 * =PAM_AUTHTOK_PROMPT / =PAM_OLDAUTHTOK_PROMPT item.
196 *
197 * If =item is set to =PAM_AUTHTOK and there is a non-null =PAM_OLDAUTHTOK
198 * item, =pam_get_authtok will ask the user to confirm the new token by
199 * retyping it.
200 * If there is a mismatch, =pam_get_authtok will return =PAM_TRY_AGAIN.
201 *
202 * >pam_get_item
203 * >pam_get_user
204 * >openpam_subst
205 */
|