read_password.c revision 84305 
1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/contrib/telnet/libtelnet/read_password.c 84305 2001-10-01 16:04:55Z markm $");
36
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)read_password.c	8.3 (Berkeley) 5/30/95";
40#endif
41#endif /* not lint */
42
43/*
44 * $Source: /mit/kerberos/src/lib/des/RCS/read_password.c,v $
45 * $Author: jon $
46 *
47 * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
48 * of Technology.
49 *
50 * For copying and distribution information, please see the file
51 * <mit-copyright.h>.
52 *
53 * This routine prints the supplied string to standard
54 * output as a prompt, and reads a password string without
55 * echoing.
56 */
57
58#if	defined(RSA_ENCPWD) || defined(KRB4_ENCPWD)
59
60#include <stdio.h>
61#include <strings.h>
62#include <sys/ioctl.h>
63#include <signal.h>
64#include <setjmp.h>
65
66static jmp_buf env;
67
68/*** Routines ****************************************************** */
69/*
70 * This version just returns the string, doesn't map to key.
71 *
72 * Returns 0 on success, non-zero on failure.
73 */
74
75int
76local_des_read_pw_string(s,max,prompt,verify)
77    char *s;
78    int	max;
79    char *prompt;
80    int	verify;
81{
82    int ok = 0;
83    char *ptr;
84
85    jmp_buf old_env;
86    struct sgttyb tty_state;
87    char key_string[BUFSIZ];
88
89    if (max > BUFSIZ) {
90	return -1;
91    }
92
93    /* XXX assume jmp_buf is typedef'ed to an array */
94    memmove((char *)env, (char *)old_env, sizeof(env));
95    if (setjmp(env))
96	goto lose;
97
98    /* save terminal state*/
99    if (ioctl(0,TIOCGETP,(char *)&tty_state) == -1)
100	return -1;
101/*
102    push_signals();
103*/
104    /* Turn off echo */
105    tty_state.sg_flags &= ~ECHO;
106    if (ioctl(0,TIOCSETP,(char *)&tty_state) == -1)
107	return -1;
108    while (!ok) {
109	(void) printf("%s", prompt);
110	(void) fflush(stdout);
111	while (!fgets(s, max, stdin));
112
113	if ((ptr = strchr(s, '\n')))
114	    *ptr = '\0';
115	if (verify) {
116	    printf("\nVerifying, please re-enter %s",prompt);
117	    (void) fflush(stdout);
118	    if (!fgets(key_string, sizeof(key_string), stdin)) {
119		clearerr(stdin);
120		continue;
121	    }
122	    if ((ptr = strchr(key_string, '\n')))
123	    *ptr = '\0';
124	    if (strcmp(s,key_string)) {
125		printf("\n\07\07Mismatch - try again\n");
126		(void) fflush(stdout);
127		continue;
128	    }
129	}
130	ok = 1;
131    }
132
133lose:
134    if (!ok)
135	memset(s, 0, max);
136    printf("\n");
137    /* turn echo back on */
138    tty_state.sg_flags |= ECHO;
139    if (ioctl(0,TIOCSETP,(char *)&tty_state))
140	ok = 0;
141/*
142    pop_signals();
143*/
144    memmove((char *)old_env, (char *)env, sizeof(env));
145    if (verify)
146	memset(key_string, 0, sizeof (key_string));
147    s[max-1] = 0;		/* force termination */
148    return !ok;			/* return nonzero if not okay */
149}
150#endif	/* defined(RSA_ENCPWD) || defined(KRB4_ENCPWD) */
151