authpasswd.c

   1 /*
   2 ** Copyright 2005-2006 Double Precision, Inc.  See COPYING for
   3 ** distribution information.
   4 */
   5
   6 #if     HAVE_CONFIG_H
   7 #include        "courier_auth_config.h"
   8 #endif
   9 #include        <string.h>
  10 #if     HAVE_UNISTD_H
  11 #include        <unistd.h>
  12 #endif
  13 #include        <stdlib.h>
  14 #include        <stdio.h>
  15 #if     HAVE_TERMIOS_H
  16 #include        <termios.h>
  17 #endif
  18 #include        <signal.h>
  19 #include        "auth.h"
  20
  21 static const char rcsid[]="$Id: authpasswd.c,v 1.2 2006/06/01 10:47:32 mrsam Exp $";
  22 /*
  23 **      Where possible, we turn off echo when entering the password.
  24 **      We set up a signal handler to catch signals and restore the echo
  25 **      prior to exiting.
  26 */
  27
  28 #if     HAVE_TERMIOS_H
  29 static struct termios tios;
  30 static int have_tios;
  31
  32 static RETSIGTYPE sighandler(int signum)
  33 {
  34         if (write(1, "\n", 1) < 0)
  35                 ; /* Ignore gcc warning */
  36         tcsetattr(0, TCSANOW, &tios);
  37         _exit(0);
  38 #if     RETSIGTYPE != void
  39         return (0);
  40 #endif
  41 }
  42 #endif
  43
  44 static void read_pw(char *buf)
  45 {
  46 int     n, c;
  47
  48         n=0;
  49         while ((c=getchar()) != EOF && c != '\n')
  50                 if (n < BUFSIZ-1)
  51                         buf[n++]=c;
  52         if (c == EOF && n == 0) exit(1);
  53         buf[n]=0;
  54 }
  55
  56 int main(int argc, char **argv)
  57 {
  58         char buf[BUFSIZ];
  59         char *p;
  60         char hint[100];
  61
  62
  63         strcpy(hint, "$1$");
  64
  65         if (argc > 1)
  66         {
  67                 sprintf(hint, "{%1.15s}", argv[1]);
  68         }
  69
  70         /* Read the password */
  71 #if     HAVE_TERMIOS_H
  72
  73         have_tios=0;
  74         if (tcgetattr(0, &tios) == 0)
  75         {
  76                 struct  termios tios2;
  77                 char    buf2[BUFSIZ];
  78
  79                 have_tios=1;
  80                 signal(SIGINT, sighandler);
  81                 signal(SIGHUP, sighandler);
  82                 tios2=tios;
  83                 tios2.c_lflag &= ~ECHO;
  84                 tcsetattr(0, TCSANOW, &tios2);
  85
  86                 for (;;)
  87                 {
  88                         if (write(2, "Password: ", 10) < 0)
  89                                 ; /* Ignore gcc warning */
  90                         read_pw(buf);
  91                         if (write(2, "\nReenter password: ", 19) < 0)
  92                                 ; /* Ignore gcc warning */
  93                         read_pw(buf2);
  94                         if (strcmp(buf, buf2) == 0)     break;
  95                         if (write(2, "\nPasswords don't match.\n\n", 25) < 0)
  96                                 ; /* Ignore gcc warning */
  97
  98                 }
  99
 100         }
 101         else
 102 #endif
 103                 read_pw(buf);
 104
 105 #if     HAVE_TERMIOS_H
 106         if (have_tios)
 107         {
 108                 if (write(2, "\n", 1) < 0)
 109                         ; /* Ignore gcc warning */
 110                 tcsetattr(0, TCSANOW, &tios);
 111                 signal(SIGINT, SIG_DFL);
 112                 signal(SIGHUP, SIG_DFL);
 113         }
 114 #endif
 115
 116         p=authcryptpasswd(buf, hint);
 117
 118         if (p)
 119                 printf("%s\n", p);
 120         return (0);
 121 }