lib/libtelnet/read_password.c

   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
  36 #ifdef __FBSDID
  37 __FBSDID("$FreeBSD: src/crypto/telnet/libtelnet/read_password.c,v 1.1.1.1.8.2 2002/04/13 10:59:07 markm Exp $");
  38 #endif
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)read_password.c     8.3 (Berkeley) 5/30/95";
  43 #endif
  44 #endif /* not lint */
  45
  46 /*
  47  * $Source: /Users/Shared/libtelnet/libtelnet/read_password.c,v $
  48  * $Author: nicolai $
  49  *
  50  * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
  51  * of Technology.
  52  *
  53  * For copying and distribution information, please see the file
  54  * <mit-copyright.h>.
  55  *
  56  * This routine prints the supplied string to standard
  57  * output as a prompt, and reads a password string without
  58  * echoing.
  59  */
  60
  61 #if     defined(RSA_ENCPWD) || defined(KRB4_ENCPWD)
  62
  63 #include <stdio.h>
  64 #include <strings.h>
  65 #include <sys/ioctl.h>
  66 #include <signal.h>
  67 #include <setjmp.h>
  68
  69 static jmp_buf env;
  70
  71 /*** Routines ****************************************************** */
  72 /*
  73  * This version just returns the string, doesn't map to key.
  74  *
  75  * Returns 0 on success, non-zero on failure.
  76  */
  77
  78 int
  79 local_des_read_pw_string(s,max,prompt,verify)
  80     char *s;
  81     int max;
  82     char *prompt;
  83     int verify;
  84 {
  85     int ok = 0;
  86     char *ptr;
  87
  88     jmp_buf old_env;
  89     struct sgttyb tty_state;
  90     char key_string[BUFSIZ];
  91
  92     if (max > BUFSIZ) {
  93         return -1;
  94     }
  95
  96     /* XXX assume jmp_buf is typedef'ed to an array */
  97     memmove((char *)env, (char *)old_env, sizeof(env));
  98     if (setjmp(env))
  99         goto lose;
 100
 101     /* save terminal state*/
 102     if (ioctl(0,TIOCGETP,(char *)&tty_state) == -1)
 103         return -1;
 104 /*
 105     push_signals();
 106 */
 107     /* Turn off echo */
 108     tty_state.sg_flags &= ~ECHO;
 109     if (ioctl(0,TIOCSETP,(char *)&tty_state) == -1)
 110         return -1;
 111     while (!ok) {
 112         (void) printf("%s", prompt);
 113         (void) fflush(stdout);
 114         while (!fgets(s, max, stdin));
 115
 116         if ((ptr = strchr(s, '\n')))
 117             *ptr = '\0';
 118         if (verify) {
 119             printf("\nVerifying, please re-enter %s",prompt);
 120             (void) fflush(stdout);
 121             if (!fgets(key_string, sizeof(key_string), stdin)) {
 122                 clearerr(stdin);
 123                 continue;
 124             }
 125             if ((ptr = strchr(key_string, '\n')))
 126             *ptr = '\0';
 127             if (strcmp(s,key_string)) {
 128                 printf("\n\07\07Mismatch - try again\n");
 129                 (void) fflush(stdout);
 130                 continue;
 131             }
 132         }
 133         ok = 1;
 134     }
 135
 136 lose:
 137     if (!ok)
 138         memset(s, 0, max);
 139     printf("\n");
 140     /* turn echo back on */
 141     tty_state.sg_flags |= ECHO;
 142     if (ioctl(0,TIOCSETP,(char *)&tty_state))
 143         ok = 0;
 144 /*
 145     pop_signals();
 146 */
 147     memmove((char *)old_env, (char *)env, sizeof(env));
 148     if (verify)
 149         memset(key_string, 0, sizeof (key_string));
 150     s[max-1] = 0;               /* force termination */
 151     return !ok;                 /* return nonzero if not okay */
 152 }
 153 #endif  /* defined(RSA_ENCPWD) || defined(KRB4_ENCPWD) */