source3/lib/ldap_escape.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    ldap filter argument escaping
   4
   5    Copyright (C) 1998, 1999, 2000 Luke Howard <lukeh@padl.com>,
   6    Copyright (C) 2003 Andrew Bartlett <abartlet@samba.org>
   7
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 /**
  27  * Escape a parameter to an LDAP filter string, so they cannot contain
  28  * embeded ( ) * or \ chars which may cause it not to parse correctly.
  29  *
  30  * @param s The input string
  31  *
  32  * @return A string allocated with malloc(), containing the escaped string,
  33  * and to be free()ed by the caller.
  34  **/
  35
  36 char *escape_ldap_string_alloc(const char *s)
  37 {
  38         size_t len = strlen(s)+1;
  39         char *output = malloc(len);
  40         char *output_tmp;
  41         const char *sub;
  42         int i = 0;
  43         char *p = output;
  44
  45         while (*s)
  46         {
  47                 switch (*s)
  48                 {
  49                 case '*':
  50                         sub = "\\2a";
  51                         break;
  52                 case '(':
  53                         sub = "\\28";
  54                         break;
  55                 case ')':
  56                         sub = "\\29";
  57                         break;
  58                 case '\\':
  59                         sub = "\\5c";
  60                         break;
  61                 default:
  62                         sub = NULL;
  63                         break;
  64                 }
  65
  66                 if (sub) {
  67                         len = len + 3;
  68                         output_tmp = realloc(output, len);
  69                         if (!output_tmp) {
  70                                 SAFE_FREE(output);
  71                                 return NULL;
  72                         }
  73                         output = output_tmp;
  74
  75                         p = &output[i];
  76                         strncpy (p, sub, 3);
  77                         p += 3;
  78                         i += 3;
  79
  80                 } else {
  81                         *p = *s;
  82                         p++;
  83                         i++;
  84                 }
  85                 s++;
  86         }
  87
  88         *p = '\0';
  89         return output;
  90 }