xref: /freebsd/contrib/telnet/libtelnet/read_password.c (revision 41466b50c1d5bfd1cf6adaae547a579a75d7c04e)
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("$FreeBSD$");
36 
37 #ifndef lint
38 #if 0
39 static 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 
66 static 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 
75 int
76 local_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 
133 lose:
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