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 1.3 2009/06/27 15:51:48 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 void sighandler(int signum)
  33 {
  34         if (write(1, "\n", 1) < 0)
  35                 ; /* Ignore gcc warning */
  36         tcsetattr(0, TCSANOW, &tios);
  37         _exit(0);
  38 }
  39 #endif
  40
  41 static void read_pw(char *buf)
  42 {
  43 int     n, c;
  44
  45         n=0;
  46         while ((c=getchar()) != EOF && c != '\n')
  47                 if (n < BUFSIZ-1)
  48                         buf[n++]=c;
  49         if (c == EOF && n == 0) exit(1);
  50         buf[n]=0;
  51 }
  52
  53 int main(int argc, char **argv)
  54 {
  55         char buf[BUFSIZ];
  56         char *p;
  57         char hint[100];
  58
  59
  60         strcpy(hint, "$1$");
  61
  62         if (argc > 1)
  63         {
  64                 sprintf(hint, "{%1.15s}", argv[1]);
  65         }
  66
  67         /* Read the password */
  68 #if     HAVE_TERMIOS_H
  69
  70         have_tios=0;
  71         if (tcgetattr(0, &tios) == 0)
  72         {
  73                 struct  termios tios2;
  74                 char    buf2[BUFSIZ];
  75
  76                 have_tios=1;
  77                 signal(SIGINT, sighandler);
  78                 signal(SIGHUP, sighandler);
  79                 tios2=tios;
  80                 tios2.c_lflag &= ~ECHO;
  81                 tcsetattr(0, TCSANOW, &tios2);
  82
  83                 for (;;)
  84                 {
  85                         if (write(2, "Password: ", 10) < 0)
  86                                 ; /* Ignore gcc warning */
  87                         read_pw(buf);
  88                         if (write(2, "\nReenter password: ", 19) < 0)
  89                                 ; /* Ignore gcc warning */
  90                         read_pw(buf2);
  91                         if (strcmp(buf, buf2) == 0)     break;
  92                         if (write(2, "\nPasswords don't match.\n\n", 25) < 0)
  93                                 ; /* Ignore gcc warning */
  94
  95                 }
  96
  97         }
  98         else
  99 #endif
 100                 read_pw(buf);
 101
 102 #if     HAVE_TERMIOS_H
 103         if (have_tios)
 104         {
 105                 if (write(2, "\n", 1) < 0)
 106                         ; /* Ignore gcc warning */
 107                 tcsetattr(0, TCSANOW, &tios);
 108                 signal(SIGINT, SIG_DFL);
 109                 signal(SIGHUP, SIG_DFL);
 110         }
 111 #endif
 112
 113         p=authcryptpasswd(buf, hint);
 114
 115         if (p)
 116                 printf("%s\n", p);
 117         return (0);
 118 }