2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2007 Dag-Erling Smørgrav
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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
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
35 * $Id: openpam_ttyconv.c 408 2007-12-21 11:36:24Z des $
38 #include <sys/types.h>
50 #include <security/pam_appl.h>
52 #include "openpam_impl.h"
54 int openpam_ttyconv_timeout = 0;
64 prompt(const char *msg)
66 char buf[PAM_MAX_RESP_SIZE];
67 struct sigaction action, saved_action;
68 sigset_t saved_sigset, sigset;
69 unsigned int saved_alarm;
76 sigaddset(&sigset, SIGINT);
77 sigaddset(&sigset, SIGTSTP);
78 sigprocmask(SIG_SETMASK, &sigset, &saved_sigset);
79 action.sa_handler = &timeout;
81 sigemptyset(&action.sa_mask);
82 sigaction(SIGALRM, &action, &saved_action);
92 if (openpam_ttyconv_timeout >= 0)
93 saved_alarm = alarm(openpam_ttyconv_timeout);
95 for (len = 0; ch != '\n' && !eof && !error; ++len) {
96 switch (read(fd, &ch, 1)) {
98 if (len < PAM_MAX_RESP_SIZE - 1) {
111 if (openpam_ttyconv_timeout >= 0)
113 sigaction(SIGALRM, &saved_action, NULL);
114 sigprocmask(SIG_SETMASK, &saved_sigset, NULL);
118 fputs(" timeout!", stderr);
121 memset(buf, 0, sizeof(buf));
124 /* trim trailing whitespace */
125 for (len = strlen(buf); len > 0; --len)
126 if (buf[len - 1] != '\r' && buf[len - 1] != '\n')
129 retval = strdup(buf);
130 memset(buf, 0, sizeof(buf));
135 prompt_echo_off(const char *msg)
137 struct termios tattr;
143 if (tcgetattr(fd, &tattr) != 0) {
144 openpam_log(PAM_LOG_ERROR, "tcgetattr(): %m");
147 lflag = tattr.c_lflag;
148 tattr.c_lflag &= ~ECHO;
149 if (tcsetattr(fd, TCSAFLUSH, &tattr) != 0) {
150 openpam_log(PAM_LOG_ERROR, "tcsetattr(): %m");
154 tattr.c_lflag = lflag;
155 (void)tcsetattr(fd, TCSANOW, &tattr);
164 * Simple tty-based conversation function
168 openpam_ttyconv(int n,
169 const struct pam_message **msg,
170 struct pam_response **resp,
173 struct pam_response *aresp;
178 if (n <= 0 || n > PAM_MAX_NUM_MSG)
179 RETURNC(PAM_CONV_ERR);
180 if ((aresp = calloc(n, sizeof *aresp)) == NULL)
181 RETURNC(PAM_BUF_ERR);
182 for (i = 0; i < n; ++i) {
183 aresp[i].resp_retcode = 0;
184 aresp[i].resp = NULL;
185 switch (msg[i]->msg_style) {
186 case PAM_PROMPT_ECHO_OFF:
187 aresp[i].resp = prompt_echo_off(msg[i]->msg);
188 if (aresp[i].resp == NULL)
191 case PAM_PROMPT_ECHO_ON:
192 aresp[i].resp = prompt(msg[i]->msg);
193 if (aresp[i].resp == NULL)
197 fputs(msg[i]->msg, stderr);
198 if (strlen(msg[i]->msg) > 0 &&
199 msg[i]->msg[strlen(msg[i]->msg) - 1] != '\n')
203 fputs(msg[i]->msg, stdout);
204 if (strlen(msg[i]->msg) > 0 &&
205 msg[i]->msg[strlen(msg[i]->msg) - 1] != '\n')
213 RETURNC(PAM_SUCCESS);
215 for (i = 0; i < n; ++i) {
216 if (aresp[i].resp != NULL) {
217 memset(aresp[i].resp, 0, strlen(aresp[i].resp));
221 memset(aresp, 0, n * sizeof *aresp);
224 RETURNC(PAM_CONV_ERR);
236 * The =openpam_ttyconv function is a standard conversation function
237 * suitable for use on TTY devices.
238 * It should be adequate for the needs of most text-based interactive
241 * The =openpam_ttyconv function allows the application to specify a
242 * timeout for user input by setting the global integer variable
243 * :openpam_ttyconv_timeout to the length of the timeout in seconds.