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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /*******************************************************************
  25  Map a username from a dos name to a unix name by looking in the username
  26  map. Note that this modifies the name in place.
  27  This is the main function that should be called *once* on
  28  any incoming or new username - in order to canonicalize the name.
  29  This is being done to de-couple the case conversions from the user mapping
  30  function. Previously, the map_username was being called
  31  every time Get_Pwnam was called.
  32  Returns True if username was changed, false otherwise.
  33 ********************************************************************/
  34
  35 BOOL map_username(fstring user)
  36 {
  37         static BOOL initialised=False;
  38         static fstring last_from,last_to;
  39         XFILE *f;
  40         char *mapfile = lp_username_map();
  41         char *s;
  42         pstring buf;
  43         BOOL mapped_user = False;
  44         char *cmd = lp_username_map_script();
  45
  46         if (!*user)
  47                 return False;
  48
  49         if (strequal(user,last_to))
  50                 return False;
  51
  52         if (strequal(user,last_from)) {
  53                 DEBUG(3,("Mapped user %s to %s\n",user,last_to));
  54                 fstrcpy(user,last_to);
  55                 return True;
  56         }
  57
  58         /* first try the username map script */
  59
  60         if ( *cmd ) {
  61                 char **qlines;
  62                 pstring command;
  63                 int numlines, ret, fd;
  64
  65                 pstr_sprintf( command, "%s \"%s\"", cmd, user );
  66
  67                 DEBUG(10,("Running [%s]\n", command));
  68                 ret = smbrun(command, &fd);
  69                 DEBUGADD(10,("returned [%d]\n", ret));
  70
  71                 if ( ret != 0 ) {
  72                         if (fd != -1)
  73                                 close(fd);
  74                         return False;
  75                 }
  76
  77                 numlines = 0;
  78                 qlines = fd_lines_load(fd, &numlines,0);
  79                 DEBUGADD(10,("Lines returned = [%d]\n", numlines));
  80                 close(fd);
  81
  82                 /* should be either no lines or a single line with the mapped username */
  83
  84                 if (numlines && qlines) {
  85                         DEBUG(3,("Mapped user %s to %s\n", user, qlines[0] ));
  86                         fstrcpy( user, qlines[0] );
  87                 }
  88
  89                 file_lines_free(qlines);
  90
  91                 return numlines != 0;
  92         }
  93
  94         /* ok.  let's try the mapfile */
  95
  96         if (!*mapfile)
  97                 return False;
  98
  99         if (!initialised) {
 100                 *last_from = *last_to = 0;
 101                 initialised = True;
 102         }
 103
 104         f = x_fopen(mapfile,O_RDONLY, 0);
 105         if (!f) {
 106                 DEBUG(0,("can't open username map %s. Error %s\n",mapfile, strerror(errno) ));
 107                 return False;
 108         }
 109
 110         DEBUG(4,("Scanning username map %s\n",mapfile));
 111
 112         while((s=fgets_slash(buf,sizeof(buf),f))!=NULL) {
 113                 char *unixname = s;
 114                 char *dosname = strchr_m(unixname,'=');
 115                 char **dosuserlist;
 116                 BOOL return_if_mapped = False;
 117
 118                 if (!dosname)
 119                         continue;
 120
 121                 *dosname++ = 0;
 122
 123                 while (isspace((int)*unixname))
 124                         unixname++;
 125
 126                 if ('!' == *unixname) {
 127                         return_if_mapped = True;
 128                         unixname++;
 129                         while (*unixname && isspace((int)*unixname))
 130                                 unixname++;
 131                 }
 132
 133                 if (!*unixname || strchr_m("#;",*unixname))
 134                         continue;
 135
 136                 {
 137                         int l = strlen(unixname);
 138                         while (l && isspace((int)unixname[l-1])) {
 139                                 unixname[l-1] = 0;
 140                                 l--;
 141                         }
 142                 }
 143
 144                 /* skip lines like 'user = ' */
 145
 146                 dosuserlist = str_list_make(dosname, NULL);
 147                 if (!dosuserlist) {
 148                         DEBUG(0,("Bad username map entry.  Unable to build user list.  Ignoring.\n"));
 149                         continue;
 150                 }
 151
 152                 if (strchr_m(dosname,'*') ||
 153                     user_in_list(user, (const char **)dosuserlist)) {
 154                         DEBUG(3,("Mapped user %s to %s\n",user,unixname));
 155                         mapped_user = True;
 156                         fstrcpy( last_from,user );
 157                         fstrcpy( user, unixname );
 158                         fstrcpy( last_to,user );
 159                         if ( return_if_mapped ) {
 160                                 str_list_free (&dosuserlist);
 161                                 x_fclose(f);
 162                                 return True;
 163                         }
 164                 }
 165
 166                 str_list_free (&dosuserlist);
 167         }
 168
 169         x_fclose(f);
 170
 171         /*
 172          * Setup the last_from and last_to as an optimization so
 173          * that we don't scan the file again for the same user.
 174          */
 175         fstrcpy(last_from,user);
 176         fstrcpy(last_to,user);
 177
 178         return mapped_user;
 179 }