src/libs/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 __FBSDID("$FreeBSD: src/contrib/telnet/libtelnet/read_password.c,v 1.5 2001/11/30 21:06:34 markm Exp $");
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)read_password.c     8.3 (Berkeley) 5/30/95";
  41 #endif
  42 #endif /* not lint */
  43
  44 /*
  45  * $Source: /mit/kerberos/src/lib/des/RCS/read_password.c,v $
  46  * $Author: jon $
  47  *
  48  * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
  49  * of Technology.
  50  *
  51  * For copying and distribution information, please see the file
  52  * <mit-copyright.h>.
  53  *
  54  * This routine prints the supplied string to standard
  55  * output as a prompt, and reads a password string without
  56  * echoing.
  57  */
  58
  59 #if     defined(RSA_ENCPWD) || defined(KRB4_ENCPWD)
  60
  61 #include <stdio.h>
  62 #include <strings.h>
  63 #include <sys/ioctl.h>
  64 #include <signal.h>
  65 #include <setjmp.h>
  66
  67 static jmp_buf env;
  68
  69 /*** Routines ****************************************************** */
  70 /*
  71  * This version just returns the string, doesn't map to key.
  72  *
  73  * Returns 0 on success, non-zero on failure.
  74  */
  75
  76 int
  77 local_des_read_pw_string(s,max,prompt,verify)
  78     char *s;
  79     int max;
  80     char *prompt;
  81     int verify;
  82 {
  83     int ok = 0;
  84     char *ptr;
  85
  86     jmp_buf old_env;
  87     struct sgttyb tty_state;
  88     char key_string[BUFSIZ];
  89
  90     if (max > BUFSIZ) {
  91         return -1;
  92     }
  93
  94     /* XXX assume jmp_buf is typedef'ed to an array */
  95     memmove((char *)env, (char *)old_env, sizeof(env));
  96     if (setjmp(env))
  97         goto lose;
  98
  99     /* save terminal state*/
 100     if (ioctl(0,TIOCGETP,(char *)&tty_state) == -1)
 101         return -1;
 102 /*
 103     push_signals();
 104 */
 105     /* Turn off echo */
 106     tty_state.sg_flags &= ~ECHO;
 107     if (ioctl(0,TIOCSETP,(char *)&tty_state) == -1)
 108         return -1;
 109     while (!ok) {
 110         (void) printf("%s", prompt);
 111         (void) fflush(stdout);
 112         while (!fgets(s, max, stdin));
 113
 114         if ((ptr = strchr(s, '\n')))
 115             *ptr = '\0';
 116         if (verify) {
 117             printf("\nVerifying, please re-enter %s",prompt);
 118             (void) fflush(stdout);
 119             if (!fgets(key_string, sizeof(key_string), stdin)) {
 120                 clearerr(stdin);
 121                 continue;
 122             }
 123             if ((ptr = strchr(key_string, '\n')))
 124             *ptr = '\0';
 125             if (strcmp(s,key_string)) {
 126                 printf("\n\07\07Mismatch - try again\n");
 127                 (void) fflush(stdout);
 128                 continue;
 129             }
 130         }
 131         ok = 1;
 132     }
 133
 134 lose:
 135     if (!ok)
 136         memset(s, 0, max);
 137     printf("\n");
 138     /* turn echo back on */
 139     tty_state.sg_flags |= ECHO;
 140     if (ioctl(0,TIOCSETP,(char *)&tty_state))
 141         ok = 0;
 142 /*
 143     pop_signals();
 144 */
 145     memmove((char *)old_env, (char *)env, sizeof(env));
 146     if (verify)
 147         memset(key_string, 0, sizeof (key_string));
 148     s[max-1] = 0;               /* force termination */
 149     return !ok;                 /* return nonzero if not okay */
 150 }
 151 #endif  /* defined(RSA_ENCPWD) || defined(KRB4_ENCPWD) */