source4/auth/unix_token.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Deal with unix elements in the security token
   5
   6    Copyright (C) Andrew Tridgell 2004
   7    Copyright (C) Andrew Bartlett 2011
   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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "auth/auth.h"
  25 #include "libcli/wbclient/wbclient.h"
  26 #include "param/param.h"
  27
  28 /*
  29   form a security_unix_token from the current security_token
  30 */
  31 NTSTATUS security_token_to_unix_token(TALLOC_CTX *mem_ctx,
  32                                       struct tevent_context *ev,
  33                                       struct security_token *token,
  34                                       struct security_unix_token **sec)
  35 {
  36         uint32_t s, g;
  37         NTSTATUS status;
  38         struct id_map *ids;
  39
  40         /* we can't do unix security without a user and group */
  41         if (token->num_sids < 2) {
  42                 return NT_STATUS_ACCESS_DENIED;
  43         }
  44
  45         *sec = talloc_zero(mem_ctx, struct security_unix_token);
  46         if (*sec == NULL) {
  47                 return NT_STATUS_NO_MEMORY;
  48         }
  49
  50         ids = talloc_zero_array(mem_ctx, struct id_map, token->num_sids);
  51         NT_STATUS_HAVE_NO_MEMORY(ids);
  52
  53         for (s=0; s < token->num_sids; s++) {
  54                 ids[s].sid = &token->sids[s];
  55                 ids[s].status = ID_UNKNOWN;
  56         }
  57
  58         status = wbc_sids_to_xids(ev, ids, token->num_sids);
  59         NT_STATUS_NOT_OK_RETURN(status);
  60
  61         g = token->num_sids;
  62         if (ids[0].xid.type != ID_TYPE_BOTH) {
  63                 g--;
  64         }
  65         (*sec)->ngroups = g;
  66         (*sec)->groups = talloc_array(*sec, gid_t, (*sec)->ngroups);
  67         NT_STATUS_HAVE_NO_MEMORY((*sec)->groups);
  68
  69         g=0;
  70         if (ids[0].xid.type == ID_TYPE_BOTH) {
  71                 (*sec)->uid = ids[0].xid.id;
  72                 (*sec)->groups[g] = ids[0].xid.id;
  73                 g++;
  74         } else if (ids[0].xid.type == ID_TYPE_UID) {
  75                 (*sec)->uid = ids[0].xid.id;
  76         } else {
  77                 char *sid_str = dom_sid_string(mem_ctx, ids[0].sid);
  78                 DEBUG(0, ("Unable to convert first SID (%s) in user token to a UID.  Conversion was returned as type %d, full token:\n",
  79                           sid_str, (int)ids[0].xid.type));
  80                 security_token_debug(0, 0, token);
  81                 talloc_free(sid_str);
  82                 return NT_STATUS_INVALID_SID;
  83         }
  84
  85         if (ids[1].xid.type == ID_TYPE_BOTH ||
  86             ids[1].xid.type == ID_TYPE_GID) {
  87                 (*sec)->gid = ids[1].xid.id;
  88                 (*sec)->groups[g] = ids[1].xid.id;
  89                 g++;
  90         } else {
  91                 char *sid_str = dom_sid_string(mem_ctx, ids[1].sid);
  92                 DEBUG(0, ("Unable to convert second SID (%s) in user token to a GID.  Conversion was returned as type %d, full token:\n",
  93                           sid_str, (int)ids[1].xid.type));
  94                 security_token_debug(0, 0, token);
  95                 talloc_free(sid_str);
  96                 return NT_STATUS_INVALID_SID;
  97         }
  98
  99         for (s=2; s < token->num_sids; s++) {
 100                 if (ids[s].xid.type == ID_TYPE_BOTH ||
 101                     ids[s].xid.type == ID_TYPE_GID) {
 102                         (*sec)->groups[g] = ids[s].xid.id;
 103                         g++;
 104                 } else {
 105                         char *sid_str = dom_sid_string(mem_ctx, ids[s].sid);
 106                         DEBUG(0, ("Unable to convert SID (%s) at index %u in user token to a GID.  Conversion was returned as type %d, full token:\n",
 107                                   sid_str, (unsigned int)s, (int)ids[s].xid.type));
 108                         security_token_debug(0, 0, token);
 109                         talloc_free(sid_str);
 110                         return NT_STATUS_INVALID_SID;
 111                 }
 112         }
 113
 114         DEBUG(5, ("Successfully converted security token to a unix token:"));
 115         security_token_debug(0, 5, token);
 116         TALLOC_FREE(ids);
 117
 118         return NT_STATUS_OK;
 119 }
 120
 121 /*
 122   Fill in the auth_user_info_unix and auth_unix_token elements in a struct session_info
 123 */
 124 NTSTATUS auth_session_info_fill_unix(struct tevent_context *ev,
 125                                      struct loadparm_context *lp_ctx,
 126                                      const char *original_user_name,
 127                                      struct auth_session_info *session_info)
 128 {
 129         char *su;
 130         size_t len;
 131         NTSTATUS status = security_token_to_unix_token(session_info, ev,
 132                                                        session_info->security_token,
 133                                                        &session_info->unix_token);
 134         if (!NT_STATUS_IS_OK(status)) {
 135                 return status;
 136         }
 137
 138         session_info->unix_info = talloc_zero(session_info, struct auth_user_info_unix);
 139         NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info);
 140
 141         session_info->unix_info->unix_name = talloc_asprintf(session_info->unix_info,
 142                                                              "%s%s%s", session_info->info->domain_name,
 143                                                              lpcfg_winbind_separator(lp_ctx),
 144                                                              session_info->info->account_name);
 145         NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info->unix_name);
 146
 147         len = strlen(original_user_name) + 1;
 148         session_info->unix_info->sanitized_username = su = talloc_array(session_info->unix_info, char, len);
 149         NT_STATUS_HAVE_NO_MEMORY(su);
 150
 151         alpha_strcpy(su, original_user_name,
 152                      ". _-$", len);
 153
 154         return NT_STATUS_OK;
 155 }