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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/*-
* Copyright (c) 2002-2003 Networks Associates Technology, Inc.
* Copyright (c) 2004-2007 Dag-Erling Smørgrav
* 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.
*
* $Id: openpam_ttyconv.c 408 2007-12-21 11:36:24Z des $
*/
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <security/pam_appl.h>
#include "openpam_impl.h"
int openpam_ttyconv_timeout = 0;
static void
timeout(int sig)
{
(void)sig;
}
static char *
prompt(const char *msg)
{
char buf[PAM_MAX_RESP_SIZE];
struct sigaction action, saved_action;
sigset_t saved_sigset, sigset;
unsigned int saved_alarm;
int eof, error, fd;
size_t len;
char *retval;
char ch;
sigemptyset(&sigset);
sigaddset(&sigset, SIGINT);
sigaddset(&sigset, SIGTSTP);
sigprocmask(SIG_SETMASK, &sigset, &saved_sigset);
action.sa_handler = &timeout;
action.sa_flags = 0;
sigemptyset(&action.sa_mask);
sigaction(SIGALRM, &action, &saved_action);
fputs(msg, stdout);
fflush(stdout);
#ifdef HAVE_FPURGE
fpurge(stdin);
#endif
fd = fileno(stdin);
buf[0] = '\0';
eof = error = 0;
saved_alarm = 0;
if (openpam_ttyconv_timeout >= 0)
saved_alarm = alarm(openpam_ttyconv_timeout);
ch = '\0';
for (len = 0; ch != '\n' && !eof && !error; ++len) {
switch (read(fd, &ch, 1)) {
case 1:
if (len < PAM_MAX_RESP_SIZE - 1) {
buf[len + 1] = '\0';
buf[len] = ch;
}
break;
case 0:
eof = 1;
break;
default:
error = errno;
break;
}
}
if (openpam_ttyconv_timeout >= 0)
alarm(0);
sigaction(SIGALRM, &saved_action, NULL);
sigprocmask(SIG_SETMASK, &saved_sigset, NULL);
if (saved_alarm > 0)
alarm(saved_alarm);
if (error == EINTR)
fputs(" timeout!", stderr);
if (error || eof) {
fputs("\n", stderr);
memset(buf, 0, sizeof(buf));
return (NULL);
}
/* trim trailing whitespace */
for (len = strlen(buf); len > 0; --len)
if (buf[len - 1] != '\r' && buf[len - 1] != '\n')
break;
buf[len] = '\0';
retval = strdup(buf);
memset(buf, 0, sizeof(buf));
return (retval);
}
static char *
prompt_echo_off(const char *msg)
{
struct termios tattr;
tcflag_t lflag;
char *ret;
int fd;
fd = fileno(stdin);
if (tcgetattr(fd, &tattr) != 0) {
openpam_log(PAM_LOG_ERROR, "tcgetattr(): %m");
return (NULL);
}
lflag = tattr.c_lflag;
tattr.c_lflag &= ~ECHO;
if (tcsetattr(fd, TCSAFLUSH, &tattr) != 0) {
openpam_log(PAM_LOG_ERROR, "tcsetattr(): %m");
return (NULL);
}
ret = prompt(msg);
tattr.c_lflag = lflag;
(void)tcsetattr(fd, TCSANOW, &tattr);
if (ret != NULL)
fputs("\n", stdout);
return (ret);
}
/*
* OpenPAM extension
*
* Simple tty-based conversation function
*/
int
openpam_ttyconv(int n,
const struct pam_message **msg,
struct pam_response **resp,
void *data)
{
struct pam_response *aresp;
int i;
ENTER();
(void)data;
if (n <= 0 || n > PAM_MAX_NUM_MSG)
RETURNC(PAM_CONV_ERR);
if ((aresp = calloc(n, sizeof *aresp)) == NULL)
RETURNC(PAM_BUF_ERR);
for (i = 0; i < n; ++i) {
aresp[i].resp_retcode = 0;
aresp[i].resp = NULL;
switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_OFF:
aresp[i].resp = prompt_echo_off(msg[i]->msg);
if (aresp[i].resp == NULL)
goto fail;
break;
case PAM_PROMPT_ECHO_ON:
aresp[i].resp = prompt(msg[i]->msg);
if (aresp[i].resp == NULL)
goto fail;
break;
case PAM_ERROR_MSG:
fputs(msg[i]->msg, stderr);
if (strlen(msg[i]->msg) > 0 &&
msg[i]->msg[strlen(msg[i]->msg) - 1] != '\n')
fputc('\n', stderr);
break;
case PAM_TEXT_INFO:
fputs(msg[i]->msg, stdout);
if (strlen(msg[i]->msg) > 0 &&
msg[i]->msg[strlen(msg[i]->msg) - 1] != '\n')
fputc('\n', stdout);
break;
default:
goto fail;
}
}
*resp = aresp;
RETURNC(PAM_SUCCESS);
fail:
for (i = 0; i < n; ++i) {
if (aresp[i].resp != NULL) {
memset(aresp[i].resp, 0, strlen(aresp[i].resp));
FREE(aresp[i].resp);
}
}
memset(aresp, 0, n * sizeof *aresp);
FREE(aresp);
*resp = NULL;
RETURNC(PAM_CONV_ERR);
}
/*
* Error codes:
*
* PAM_SYSTEM_ERR
* PAM_BUF_ERR
* PAM_CONV_ERR
*/
/**
* The =openpam_ttyconv function is a standard conversation function
* suitable for use on TTY devices.
* It should be adequate for the needs of most text-based interactive
* programs.
*
* The =openpam_ttyconv function allows the application to specify a
* timeout for user input by setting the global integer variable
* :openpam_ttyconv_timeout to the length of the timeout in seconds.
*
* >openpam_nullconv
* >pam_prompt
* >pam_vprompt
*/
|
