read_password.c revision 29089 
176105Sphantom/*-
276105Sphantom * Copyright (c) 1992, 1993
376105Sphantom *	The Regents of the University of California.  All rights reserved.
476105Sphantom *
576105Sphantom * Redistribution and use in source and binary forms, with or without
676105Sphantom * modification, are permitted provided that the following conditions
776105Sphantom * are met:
876105Sphantom * 1. Redistributions of source code must retain the above copyright
976105Sphantom *    notice, this list of conditions and the following disclaimer.
1076105Sphantom * 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#ifndef lint
35static char sccsid[] = "@(#)read_password.c	8.3 (Berkeley) 5/30/95";
36#endif /* not lint */
37
38/*
39 * $Source: /mit/kerberos/src/lib/des/RCS/read_password.c,v $
40 * $Author: jon $
41 *
42 * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
43 * of Technology.
44 *
45 * For copying and distribution information, please see the file
46 * <mit-copyright.h>.
47 *
48 * This routine prints the supplied string to standard
49 * output as a prompt, and reads a password string without
50 * echoing.
51 */
52
53#if	defined(RSA_ENCPWD) || defined(KRB4_ENCPWD)
54
55#include <stdio.h>
56#include <strings.h>
57#include <sys/ioctl.h>
58#include <signal.h>
59#include <setjmp.h>
60
61static jmp_buf env;
62
63/*** Routines ****************************************************** */
64/*
65 * This version just returns the string, doesn't map to key.
66 *
67 * Returns 0 on success, non-zero on failure.
68 */
69
70int
71local_des_read_pw_string(s,max,prompt,verify)
72    char *s;
73    int	max;
74    char *prompt;
75    int	verify;
76{
77    int ok = 0;
78    char *ptr;
79
80    jmp_buf old_env;
81    struct sgttyb tty_state;
82    char key_string[BUFSIZ];
83
84    if (max > BUFSIZ) {
85	return -1;
86    }
87
88    /* XXX assume jmp_buf is typedef'ed to an array */
89    memmove((char *)env, (char *)old_env, sizeof(env));
90    if (setjmp(env))
91	goto lose;
92
93    /* save terminal state*/
94    if (ioctl(0,TIOCGETP,(char *)&tty_state) == -1)
95	return -1;
96/*
97    push_signals();
98*/
99    /* Turn off echo */
100    tty_state.sg_flags &= ~ECHO;
101    if (ioctl(0,TIOCSETP,(char *)&tty_state) == -1)
102	return -1;
103    while (!ok) {
104	(void) printf(prompt);
105	(void) fflush(stdout);
106	while (!fgets(s, max, stdin));
107
108	if ((ptr = strchr(s, '\n')))
109	    *ptr = '\0';
110	if (verify) {
111	    printf("\nVerifying, please re-enter %s",prompt);
112	    (void) fflush(stdout);
113	    if (!fgets(key_string, sizeof(key_string), stdin)) {
114		clearerr(stdin);
115		continue;
116	    }
117	    if ((ptr = strchr(key_string, '\n')))
118	    *ptr = '\0';
119	    if (strcmp(s,key_string)) {
120		printf("\n\07\07Mismatch - try again\n");
121		(void) fflush(stdout);
122		continue;
123	    }
124	}
125	ok = 1;
126    }
127
128lose:
129    if (!ok)
130	memset(s, 0, max);
131    printf("\n");
132    /* turn echo back on */
133    tty_state.sg_flags |= ECHO;
134    if (ioctl(0,TIOCSETP,(char *)&tty_state))
135	ok = 0;
136/*
137    pop_signals();
138*/
139    memmove((char *)old_env, (char *)env, sizeof(env));
140    if (verify)
141	memset(key_string, 0, sizeof (key_string));
142    s[max-1] = 0;		/* force termination */
143    return !ok;			/* return nonzero if not okay */
144}
145#endif	/* defined(RSA_ENCPWD) || defined(KRB4_ENCPWD) */
146