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read_pwd.c

/* crypto/des/read_pwd.c */
/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@mincom.oz.au).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@mincom.oz.au).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@mincom.oz.au)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#ifdef WIN16TTY
#undef WIN16
#undef _WINDOWS
#include <graph.h>
#endif

/* 06-Apr-92 Luke Brennan    Support for VMS */
#include "des_locl.h"
#include <signal.h>
#include <string.h>
#include <setjmp.h>
#include <errno.h>

/* There are 5 types of terminal interface supported,
 * TERMIO, TERMIOS, VMS, MSDOS and SGTTY
 */

#if defined(__sgi) && !defined(TERMIOS)
#define TERMIOS
#undef TERMIO
#undef SGTTY
#endif

#if defined(linux) && !defined(TERMIO)
#undef TERMIOS
#define TERMIO
#undef SGTTY
#endif

#ifdef _LIBC
#define TERMIO
#endif

#if !defined(TERMIO) && !defined(TERMIOS) && !defined(VMS) && !defined(MSDOS)
#define SGTTY
#endif

#ifdef TERMIOS
#include <termios.h>
#define TTY_STRUCT            struct termios
#define TTY_FLAGS       c_lflag
#define     TTY_get(tty,data) tcgetattr(tty,data)
#define TTY_set(tty,data)     tcsetattr(tty,TCSANOW,data)
#endif

#ifdef TERMIO
#include <termio.h>
#define TTY_STRUCT            struct termio
#define TTY_FLAGS       c_lflag
#define TTY_get(tty,data)     ioctl(tty,TCGETA,data)
#define TTY_set(tty,data)     ioctl(tty,TCSETA,data)
#endif

#ifdef SGTTY
#include <sgtty.h>
#define TTY_STRUCT            struct sgttyb
#define TTY_FLAGS       sg_flags
#define TTY_get(tty,data)     ioctl(tty,TIOCGETP,data)
#define TTY_set(tty,data)     ioctl(tty,TIOCSETP,data)
#endif

#if !defined(_LIBC) && !defined(MSDOS) && !defined(VMS)
#include <sys/ioctl.h>
#endif

#ifdef MSDOS
#include <conio.h>
#define fgets(a,b,c) noecho_fgets(a,b,c)
#endif

#ifdef VMS
#include <ssdef.h>
#include <iodef.h>
#include <ttdef.h>
#include <descrip.h>
struct IOSB {
      short iosb$w_value;
      short iosb$w_count;
      long  iosb$l_info;
      };
#endif

#ifndef NX509_SIG
#define NX509_SIG 32
#endif

#ifndef NOPROTO
static void read_till_nl(FILE *);
static int read_pw(char *buf, char *buff, int size, char *prompt, int verify);
static void recsig(int);
static void pushsig(void);
static void popsig(void);
#if defined(MSDOS) && !defined(WIN16)
static int noecho_fgets(char *buf, int size, FILE *tty);
#endif
#else
static void read_till_nl();
static int read_pw();
static void recsig();
static void pushsig();
static void popsig();
#if defined(MSDOS) && !defined(WIN16)
static int noecho_fgets();
#endif
#endif

#ifndef NOPROTO
static void (*savsig[NX509_SIG])(int );
#else
static void (*savsig[NX509_SIG])();
#endif
static jmp_buf save;

int des_read_password(key, prompt, verify)
des_cblock (*key);
char *prompt;
int verify;
      {
      int ok;
      char buf[BUFSIZ],buff[BUFSIZ];

      if ((ok=read_pw(buf,buff,BUFSIZ,prompt,verify)) == 0)
            des_string_to_key(buf,key);
      memset(buf,0,BUFSIZ);
      memset(buff,0,BUFSIZ);
      return(ok);
      }

int des_read_2passwords(key1, key2, prompt, verify)
des_cblock (*key1);
des_cblock (*key2);
char *prompt;
int verify;
      {
      int ok;
      char buf[BUFSIZ],buff[BUFSIZ];

      if ((ok=read_pw(buf,buff,BUFSIZ,prompt,verify)) == 0)
            des_string_to_2keys(buf,key1,key2);
      memset(buf,0,BUFSIZ);
      memset(buff,0,BUFSIZ);
      return(ok);
      }

int des_read_pw_string(buf, length, prompt, verify)
char *buf;
int length;
char *prompt;
int verify;
      {
      char buff[BUFSIZ];
      int ret;

      ret=read_pw(buf,buff,(length>BUFSIZ)?BUFSIZ:length,prompt,verify);
      memset(buff,0,BUFSIZ);
      return(ret);
      }

#ifndef WIN16

static void read_till_nl(in)
FILE *in;
      {
#define SIZE 4
      char buf[SIZE+1];

      do    {
            fgets(buf,SIZE,in);
            } while (strchr(buf,'\n') == NULL);
      }


/* return 0 if ok, 1 (or -1) otherwise */
static int read_pw(buf, buff, size, prompt, verify)
char *buf;
char *buff;
int size;
char *prompt;
int verify;
      {
#ifdef VMS
      struct IOSB iosb;
      $DESCRIPTOR(terminal,"TT");
      long tty_orig[3], tty_new[3];
      long status;
      unsigned short channel = 0;
#else
#ifndef MSDOS
      TTY_STRUCT tty_orig,tty_new;
#endif
#endif
      int number=5;
      int ok=0;
      int ps=0;
      int is_a_tty=1;

      FILE *tty=NULL;
      char *p;

#ifdef __CYGWIN32__
      tty = stdin;
#elif !defined(MSDOS)
      if ((tty=fopen("/dev/tty","r")) == NULL)
            tty=stdin;
#else /* MSDOS */
      if ((tty=fopen("con","r")) == NULL)
            tty=stdin;
#endif /* MSDOS */

#if defined(TTY_get) && !defined(VMS)
      if (TTY_get(fileno(tty),&tty_orig) == -1)
            {
#ifdef ENOTTY
            if (errno == ENOTTY)
                  is_a_tty=0;
            else
#endif
                  return(-1);
            }
      memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
#endif
#ifdef VMS
      status = SYS$ASSIGN(&terminal,&channel,0,0);
      if (status != SS$_NORMAL)
            return(-1);
      status=SYS$QIOW(0,channel,IO$_SENSEMODE,&iosb,0,0,tty_orig,12,0,0,0,0);
      if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
            return(-1);
#endif

      if (setjmp(save))
            {
            ok=0;
            goto error;
            }
      pushsig();
      ps=1;

#ifdef TTY_FLAGS
      tty_new.TTY_FLAGS &= ~ECHO;
#endif

#if defined(TTY_set) && !defined(VMS)
      if (is_a_tty && (TTY_set(fileno(tty),&tty_new) == -1))
            return(-1);
#endif
#ifdef VMS
      tty_new[0] = tty_orig[0];
      tty_new[1] = tty_orig[1] | TT$M_NOECHO;
      tty_new[2] = tty_orig[2];
      status = SYS$QIOW(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
      if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
            return(-1);
#endif
      ps=2;

      while ((!ok) && (number--))
            {
            fputs(prompt,stderr);
            fflush(stderr);

            buf[0]='\0';
            fgets(buf,size,tty);
            if (feof(tty)) goto error;
            if (ferror(tty)) goto error;
            if ((p=(char *)strchr(buf,'\n')) != NULL)
                  *p='\0';
            else  read_till_nl(tty);
            if (verify)
                  {
                  fprintf(stderr,"\nVerifying password - %s",prompt);
                  fflush(stderr);
                  buff[0]='\0';
                  fgets(buff,size,tty);
                  if (feof(tty)) goto error;
                  if ((p=(char *)strchr(buff,'\n')) != NULL)
                        *p='\0';
                  else  read_till_nl(tty);
                        
                  if (strcmp(buf,buff) != 0)
                        {
                        fprintf(stderr,"\nVerify failure");
                        fflush(stderr);
                        break;
                        /* continue; */
                        }
                  }
            ok=1;
            }

error:
      fprintf(stderr,"\n");
#ifdef DEBUG
      perror("fgets(tty)");
#endif
      /* What can we do if there is an error? */
#if defined(TTY_set) && !defined(VMS) 
      if (ps >= 2) TTY_set(fileno(tty),&tty_orig);
#endif
#ifdef VMS
      if (ps >= 2)
            status = SYS$QIOW(0,channel,IO$_SETMODE,&iosb,0,0
                  ,tty_orig,12,0,0,0,0);
#endif
      
      if (ps >= 1) popsig();
      if (stdin != tty) fclose(tty);
#ifdef VMS
      status = SYS$DASSGN(channel);
#endif
      return(!ok);
      }

#else /* WIN16 */

static int read_pw(buf, buff, size, prompt, verify)
char *buf;
char *buff;
int size;
char *prompt;
int verify;
      { 
      memset(buf,0,size);
      memset(buff,0,size);
      return(0);
      }

#endif

static void pushsig()
      {
      int i;

      for (i=1; i<NX509_SIG; i++)
            savsig[i]=signal(i,recsig);

#ifdef SIGWINCH
      signal(SIGWINCH,SIG_DFL);
#endif
      }

static void popsig()
      {
      int i;

      for (i=1; i<NX509_SIG; i++)
            signal(i,savsig[i]);
      }

static void recsig(i)
int i;
      {
      longjmp(save,1);
#ifdef LINT
      i=i;
#endif
      }

#if defined(MSDOS) && !defined(WIN16)
static int noecho_fgets(buf,size,tty)
char *buf;
int size;
FILE *tty;
      {
      int i;
      char *p;

      p=buf;
      for (;;)
            {
            if (size == 0)
                  {
                  *p='\0';
                  break;
                  }
            size--;
#ifdef WIN16TTY
            i=_inchar();
#else
            i=getch();
#endif
            if (i == '\r') i='\n';
            *(p++)=i;
            if (i == '\n')
                  {
                  *p='\0';
                  break;
                  }
            }
      return(strlen(buf));
      }
#endif

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