source: openpam/trunk/lib/openpam_ttyconv.c @ 19

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

Use 'sizeof(foo)' instead of 'sizeof foo' even where it's not
required. Although style(9) doesn't say anything about it, this
seems to be the preferred form.

Sponsored by: DARPA, NAI Labs

  • Property svn:keywords set to Id LastChangedRevision HeadURL LastChangedDate LastChangedBy
File size: 3.7 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technologies, 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 * $Id: openpam_ttyconv.c 19 2002-02-02 18:04:31Z des $
35 */
36
37#include <sys/types.h>
38
39#include <ctype.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <termios.h>
44
45#include <security/pam_appl.h>
46#include <security/openpam.h>
47
48/*
49 * Simple tty-based conversation function.
50 */
51
52int
53openpam_ttyconv(int n,
54         const struct pam_message **msg,
55         struct pam_response **resp,
56         void *data)
57{
58        char buf[PAM_MAX_RESP_SIZE];
59        struct termios tattr;
60        tcflag_t lflag;
61        int fd, err, i;
62        size_t len;
63
64        data = data;
65        if (n <= 0 || n > PAM_MAX_NUM_MSG)
66                return (PAM_CONV_ERR);
67        if ((*resp = calloc(n, sizeof(**resp))) == NULL)
68                return (PAM_BUF_ERR);
69        fd = fileno(stdin);
70        for (i = 0; i < n; ++i) {
71                resp[i]->resp_retcode = 0;
72                resp[i]->resp = NULL;
73                switch (msg[i]->msg_style) {
74                case PAM_PROMPT_ECHO_OFF:
75                case PAM_PROMPT_ECHO_ON:
76                        if (msg[i]->msg_style == PAM_PROMPT_ECHO_OFF) {
77                                if (tcgetattr(fd, &tattr) != 0) {
78                                        openpam_log(PAM_LOG_ERROR,
79                                            "tcgetattr(): %m");
80                                        err = PAM_CONV_ERR;
81                                        goto fail;
82                                }
83                                lflag = tattr.c_lflag;
84                                tattr.c_lflag &= ~ECHO;
85                                if (tcsetattr(fd, TCSAFLUSH, &tattr) != 0) {
86                                        openpam_log(PAM_LOG_ERROR,
87                                            "tcsetattr(): %m");
88                                        err = PAM_CONV_ERR;
89                                        goto fail;
90                                }
91                        }
92                        fputs(msg[i]->msg, stderr);
93                        buf[0] = '\0';
94                        fgets(buf, sizeof(buf), stdin);
95                        if (msg[i]->msg_style == PAM_PROMPT_ECHO_OFF) {
96                                tattr.c_lflag = lflag;
97                                (void)tcsetattr(fd, TCSANOW, &tattr);
98                                fputs("\n", stderr);
99                        }
100                        if (ferror(stdin)) {
101                                err = PAM_CONV_ERR;
102                                goto fail;
103                        }
104                        for (len = strlen(buf); len > 0; --len)
105                                if (!isspace(buf[len - 1]))
106                                        break;
107                        buf[len] = '\0';
108                        if ((resp[i]->resp = strdup(buf)) == NULL) {
109                                err = PAM_BUF_ERR;
110                                goto fail;
111                        }
112                        break;
113                case PAM_ERROR_MSG:
114                        fputs(msg[i]->msg, stderr);
115                        break;
116                case PAM_TEXT_INFO:
117                        fputs(msg[i]->msg, stdout);
118                        break;
119                default:
120                        err = PAM_BUF_ERR;
121                        goto fail;
122                }
123        }
124        return (PAM_SUCCESS);
125 fail:
126        while (i)
127                free(resp[--i]);
128        free(*resp);
129        *resp = NULL;
130        return (err);
131}
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