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