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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)read_password.c  8.3 (Berkeley) 5/30/95
  30  * $FreeBSD: src/crypto/telnet/libtelnet/read_password.c,v 1.1.1.1.8.2 2002/04/13 10:59:07 markm Exp $
  31  */
  32
  33 /*
  34  * $Source: /mit/kerberos/src/lib/des/RCS/read_password.c,v $
  35  * $Author: jon $
  36  *
  37  * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
  38  * of Technology.
  39  *
  40  * For copying and distribution information, please see the file
  41  * <mit-copyright.h>.
  42  *
  43  * This routine prints the supplied string to standard
  44  * output as a prompt, and reads a password string without
  45  * echoing.
  46  */
  47
  48 #if     defined(RSA_ENCPWD) || defined(KRB4_ENCPWD)
  49
  50 #include <stdio.h>
  51 #include <strings.h>
  52 #include <sys/ioctl.h>
  53 #include <signal.h>
  54 #include <setjmp.h>
  55
  56 static jmp_buf env;
  57
  58 /*** Routines ****************************************************** */
  59 /*
  60  * This version just returns the string, doesn't map to key.
  61  *
  62  * Returns 0 on success, non-zero on failure.
  63  */
  64
  65 int
  66 local_des_read_pw_string(s,max,prompt,verify)
  67     char *s;
  68     int max;
  69     char *prompt;
  70     int verify;
  71 {
  72     int ok = 0;
  73     char *ptr;
  74
  75     jmp_buf old_env;
  76     struct sgttyb tty_state;
  77     char key_string[BUFSIZ];
  78
  79     if (max > BUFSIZ) {
  80         return -1;
  81     }
  82
  83     /* XXX assume jmp_buf is typedef'ed to an array */
  84     memmove((char *)env, (char *)old_env, sizeof(env));
  85     if (setjmp(env))
  86         goto lose;
  87
  88     /* save terminal state*/
  89     if (ioctl(0,TIOCGETP,(char *)&tty_state) == -1)
  90         return -1;
  91 /*
  92     push_signals();
  93 */
  94     /* Turn off echo */
  95     tty_state.sg_flags &= ~ECHO;
  96     if (ioctl(0,TIOCSETP,(char *)&tty_state) == -1)
  97         return -1;
  98     while (!ok) {
  99         (void) printf("%s", prompt);
 100         (void) fflush(stdout);
 101         while (!fgets(s, max, stdin));
 102
 103         if ((ptr = strchr(s, '\n')))
 104             *ptr = '\0';
 105         if (verify) {
 106             printf("\nVerifying, please re-enter %s",prompt);
 107             (void) fflush(stdout);
 108             if (!fgets(key_string, sizeof(key_string), stdin)) {
 109                 clearerr(stdin);
 110                 continue;
 111             }
 112             if ((ptr = strchr(key_string, '\n')))
 113                     *ptr = '\0';
 114             if (strcmp(s,key_string)) {
 115                 printf("\n\07\07Mismatch - try again\n");
 116                 (void) fflush(stdout);
 117                 continue;
 118             }
 119         }
 120         ok = 1;
 121     }
 122
 123 lose:
 124     if (!ok)
 125         memset(s, 0, max);
 126     printf("\n");
 127     /* turn echo back on */
 128     tty_state.sg_flags |= ECHO;
 129     if (ioctl(0,TIOCSETP,(char *)&tty_state))
 130         ok = 0;
 131 /*
 132     pop_signals();
 133 */
 134     memmove((char *)old_env, (char *)env, sizeof(env));
 135     if (verify)
 136         memset(key_string, 0, sizeof (key_string));
 137     s[max-1] = 0;               /* force termination */
 138     return !ok;                 /* return nonzero if not okay */
 139 }
 140 #endif  /* defined(RSA_ENCPWD) || defined(KRB4_ENCPWD) */