source/smbd/map_username.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Username handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 1997-2001.
   6    Copyright (C) Volker Lendecke 2006
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24
  25 /*******************************************************************
  26  Map a username from a dos name to a unix name by looking in the username
  27  map. Note that this modifies the name in place.
  28  This is the main function that should be called *once* on
  29  any incoming or new username - in order to canonicalize the name.
  30  This is being done to de-couple the case conversions from the user mapping
  31  function. Previously, the map_username was being called
  32  every time Get_Pwnam was called.
  33  Returns True if username was changed, false otherwise.
  34 ********************************************************************/
  35
  36 BOOL map_username(fstring user)
  37 {
  38         static BOOL initialised=False;
  39         static fstring last_from,last_to;
  40         XFILE *f;
  41         char *mapfile = lp_username_map();
  42         char *s;
  43         pstring buf;
  44         BOOL mapped_user = False;
  45         char *cmd = lp_username_map_script();
  46
  47         if (!*user)
  48                 return False;
  49
  50         if (strequal(user,last_to))
  51                 return False;
  52
  53         if (strequal(user,last_from)) {
  54                 DEBUG(3,("Mapped user %s to %s\n",user,last_to));
  55                 fstrcpy(user,last_to);
  56                 return True;
  57         }
  58
  59         /* first try the username map script */
  60
  61         if ( *cmd ) {
  62                 char **qlines;
  63                 pstring command;
  64                 int numlines, ret, fd;
  65
  66                 pstr_sprintf( command, "%s \"%s\"", cmd, user );
  67
  68                 DEBUG(10,("Running [%s]\n", command));
  69                 ret = smbrun(command, &fd);
  70                 DEBUGADD(10,("returned [%d]\n", ret));
  71
  72                 if ( ret != 0 ) {
  73                         if (fd != -1)
  74                                 close(fd);
  75                         return False;
  76                 }
  77
  78                 numlines = 0;
  79                 qlines = fd_lines_load(fd, &numlines,0);
  80                 DEBUGADD(10,("Lines returned = [%d]\n", numlines));
  81                 close(fd);
  82
  83                 /* should be either no lines or a single line with the mapped username */
  84
  85                 if (numlines && qlines) {
  86                         DEBUG(3,("Mapped user %s to %s\n", user, qlines[0] ));
  87                         fstrcpy( user, qlines[0] );
  88                 }
  89
  90                 file_lines_free(qlines);
  91
  92                 return numlines != 0;
  93         }
  94
  95         /* ok.  let's try the mapfile */
  96
  97         if (!*mapfile)
  98                 return False;
  99
 100         if (!initialised) {
 101                 *last_from = *last_to = 0;
 102                 initialised = True;
 103         }
 104
 105         f = x_fopen(mapfile,O_RDONLY, 0);
 106         if (!f) {
 107                 DEBUG(0,("can't open username map %s. Error %s\n",mapfile, strerror(errno) ));
 108                 return False;
 109         }
 110
 111         DEBUG(4,("Scanning username map %s\n",mapfile));
 112
 113         while((s=fgets_slash(buf,sizeof(buf),f))!=NULL) {
 114                 char *unixname = s;
 115                 char *dosname = strchr_m(unixname,'=');
 116                 char **dosuserlist;
 117                 BOOL return_if_mapped = False;
 118
 119                 if (!dosname)
 120                         continue;
 121
 122                 *dosname++ = 0;
 123
 124                 while (isspace((int)*unixname))
 125                         unixname++;
 126
 127                 if ('!' == *unixname) {
 128                         return_if_mapped = True;
 129                         unixname++;
 130                         while (*unixname && isspace((int)*unixname))
 131                                 unixname++;
 132                 }
 133
 134                 if (!*unixname || strchr_m("#;",*unixname))
 135                         continue;
 136
 137                 {
 138                         int l = strlen(unixname);
 139                         while (l && isspace((int)unixname[l-1])) {
 140                                 unixname[l-1] = 0;
 141                                 l--;
 142                         }
 143                 }
 144
 145                 /* skip lines like 'user = ' */
 146
 147                 dosuserlist = str_list_make(dosname, NULL);
 148                 if (!dosuserlist) {
 149                         DEBUG(0,("Bad username map entry.  Unable to build user list.  Ignoring.\n"));
 150                         continue;
 151                 }
 152
 153                 if (strchr_m(dosname,'*') ||
 154                     user_in_list(user, (const char **)dosuserlist)) {
 155                         DEBUG(3,("Mapped user %s to %s\n",user,unixname));
 156                         mapped_user = True;
 157                         fstrcpy( last_from,user );
 158                         fstrcpy( user, unixname );
 159                         fstrcpy( last_to,user );
 160                         if ( return_if_mapped ) {
 161                                 str_list_free (&dosuserlist);
 162                                 x_fclose(f);
 163                                 return True;
 164                         }
 165                 }
 166
 167                 str_list_free (&dosuserlist);
 168         }
 169
 170         x_fclose(f);
 171
 172         /*
 173          * Setup the last_from and last_to as an optimization so
 174          * that we don't scan the file again for the same user.
 175          */
 176         fstrcpy(last_from,user);
 177         fstrcpy(last_to,user);
 178
 179         return mapped_user;
 180 }