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  * @(#)read_password.c  8.3 (Berkeley) 5/30/95
  34  * $FreeBSD: src/crypto/telnet/libtelnet/read_password.c,v 1.1.1.1.8.2 2002/04/13 10:59:07 markm Exp $
  35  * $DragonFly: src/crypto/telnet/libtelnet/read_password.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
  36  */
  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
  61 static 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
  70 int
  71 local_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("%s", 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
 128 lose:
 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) */