git.sur5r.net Git - openldap/blob - libraries/liblutil/passfile.c

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 2002-2003 The OpenLDAP Foundation, All Rights Reserved.
   4  * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
   5  */
   6
   7 #include "portable.h"
   8
   9 #include <stdio.h>
  10
  11 #include <ac/stdlib.h>
  12 #include <ac/ctype.h>
  13 #include <ac/string.h>
  14
  15 #ifdef HAVE_FSTAT
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #endif /* HAVE_FSTAT */
  19
  20 #include <lber.h>
  21 #include <lutil.h>
  22
  23 /* Get a password from a file. */
  24 int
  25 lutil_get_filed_password(
  26         const char *filename,
  27         struct berval *passwd )
  28 {
  29         size_t nread, nleft, nr;
  30         FILE *f = fopen( filename, "r" );
  31
  32         if( f == NULL ) {
  33                 perror( filename );
  34                 return -1;
  35         }
  36
  37         passwd->bv_val = NULL;
  38         passwd->bv_len = 4196;
  39
  40 #ifdef HAVE_FSTAT
  41         {
  42                 struct stat sb;
  43                 if ( fstat( fileno( f ), &sb ) == 0 ) {
  44                         if( sb.st_mode & 006 ) {
  45                                 fprintf( stderr,
  46                                         "Warning: Password file %s is publicly readable/writeable\n",
  47                                         filename );
  48                         }
  49
  50                         passwd->bv_len = sb.st_size;
  51                 }
  52         }
  53 #endif /* HAVE_FSTAT */
  54
  55         passwd->bv_val = (char *) malloc( passwd->bv_len + 1 );
  56         if( passwd->bv_val == NULL ) {
  57                 perror( filename );
  58                 return -1;
  59         }
  60
  61         nread = 0;
  62         nleft = passwd->bv_len;
  63         do {
  64                 if( nleft == 0 ) {
  65                         /* double the buffer size */
  66                         char *p = (char *) realloc( passwd->bv_val,
  67                                 2 * passwd->bv_len + 1 );
  68                         if( p == NULL ) {
  69                                 free( passwd->bv_val );
  70                                 passwd->bv_val = NULL;
  71                                 passwd->bv_len = 0;
  72                                 return -1;
  73                         }
  74                         nleft = passwd->bv_len;
  75                         passwd->bv_len *= 2;
  76                         passwd->bv_val = p;
  77                 }
  78
  79                 nr = fread( &passwd->bv_val[nread], 1, nleft, f );
  80
  81                 if( nr < nleft && ferror( f ) ) {
  82                         free( passwd->bv_val );
  83                         passwd->bv_val = NULL;
  84                         passwd->bv_len = 0;
  85                         return -1;
  86                 }
  87
  88                 nread += nr;
  89                 nleft -= nr;
  90         } while ( !feof(f) );
  91
  92         passwd->bv_len = nread;
  93         passwd->bv_val[nread] = '\0';
  94
  95         fclose( f );
  96         return 0;
  97 }