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 wbc_context *wbc_ctx,
  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         struct composite_context *ctx;
  40
  41         /* we can't do unix security without a user and group */
  42         if (token->num_sids < 2) {
  43                 return NT_STATUS_ACCESS_DENIED;
  44         }
  45
  46         *sec = talloc_zero(mem_ctx, struct security_unix_token);
  47         if (*sec == NULL) {
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50
  51         ids = talloc_zero_array(mem_ctx, struct id_map, token->num_sids);
  52         NT_STATUS_HAVE_NO_MEMORY(ids);
  53
  54         for (s=0; s < token->num_sids; s++) {
  55                 ids[s].sid = &token->sids[s];
  56                 ids[s].status = ID_UNKNOWN;
  57         }
  58
  59         ctx = wbc_sids_to_xids_send(wbc_ctx, ids, token->num_sids, ids);
  60         NT_STATUS_HAVE_NO_MEMORY(ctx);
  61
  62         status = wbc_sids_to_xids_recv(ctx, &ids);
  63         NT_STATUS_NOT_OK_RETURN(status);
  64
  65         g = token->num_sids;
  66         if (ids[0].xid.type != ID_TYPE_BOTH) {
  67                 g--;
  68         }
  69         (*sec)->ngroups = g;
  70         (*sec)->groups = talloc_array(*sec, gid_t, (*sec)->ngroups);
  71         NT_STATUS_HAVE_NO_MEMORY((*sec)->groups);
  72
  73         g=0;
  74         if (ids[0].xid.type == ID_TYPE_BOTH) {
  75                 (*sec)->uid = ids[0].xid.id;
  76                 (*sec)->groups[g] = ids[0].xid.id;
  77                 g++;
  78         } else if (ids[0].xid.type == ID_TYPE_UID) {
  79                 (*sec)->uid = ids[0].xid.id;
  80         } else {
  81                 char *sid_str = dom_sid_string(mem_ctx, ids[0].sid);
  82                 DEBUG(0, ("Unable to convert first SID (%s) in user token to a UID.  Conversion was returned as type %d, full token:\n",
  83                           sid_str, (int)ids[0].xid.type));
  84                 security_token_debug(0, 0, token);
  85                 talloc_free(sid_str);
  86                 return NT_STATUS_INVALID_SID;
  87         }
  88
  89         if (ids[1].xid.type == ID_TYPE_BOTH ||
  90             ids[1].xid.type == ID_TYPE_GID) {
  91                 (*sec)->gid = ids[1].xid.id;
  92                 (*sec)->groups[g] = ids[1].xid.id;
  93                 g++;
  94         } else {
  95                 char *sid_str = dom_sid_string(mem_ctx, ids[1].sid);
  96                 DEBUG(0, ("Unable to convert second SID (%s) in user token to a GID.  Conversion was returned as type %d, full token:\n",
  97                           sid_str, (int)ids[1].xid.type));
  98                 security_token_debug(0, 0, token);
  99                 talloc_free(sid_str);
 100                 return NT_STATUS_INVALID_SID;
 101         }
 102
 103         for (s=2; s < token->num_sids; s++) {
 104                 if (ids[s].xid.type == ID_TYPE_BOTH ||
 105                     ids[s].xid.type == ID_TYPE_GID) {
 106                         (*sec)->groups[g] = ids[s].xid.id;
 107                         g++;
 108                 } else {
 109                         char *sid_str = dom_sid_string(mem_ctx, ids[s].sid);
 110                         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",
 111                                   sid_str, (unsigned int)s, (int)ids[s].xid.type));
 112                         security_token_debug(0, 0, token);
 113                         talloc_free(sid_str);
 114                         return NT_STATUS_INVALID_SID;
 115                 }
 116         }
 117
 118         DEBUG(5, ("Successfully converted security token to a unix token:"));
 119         security_token_debug(0, 5, token);
 120         TALLOC_FREE(ids);
 121
 122         return NT_STATUS_OK;
 123 }
 124
 125 /*
 126   Fill in the auth_user_info_unix and auth_unix_token elements in a struct session_info
 127 */
 128 NTSTATUS auth_session_info_fill_unix(struct wbc_context *wbc_ctx,
 129                                      struct loadparm_context *lp_ctx,
 130                                      const char *original_user_name,
 131                                      struct auth_session_info *session_info)
 132 {
 133         char *su;
 134         size_t len;
 135         NTSTATUS status = security_token_to_unix_token(session_info, wbc_ctx,
 136                                                        session_info->security_token,
 137                                                        &session_info->unix_token);
 138         if (!NT_STATUS_IS_OK(status)) {
 139                 return status;
 140         }
 141
 142         session_info->unix_info = talloc_zero(session_info, struct auth_user_info_unix);
 143         NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info);
 144
 145         session_info->unix_info->system = security_token_is_system(session_info->security_token);
 146
 147         session_info->unix_info->unix_name = talloc_asprintf(session_info->unix_info,
 148                                                              "%s%s%s", session_info->info->domain_name,
 149                                                              lpcfg_winbind_separator(lp_ctx),
 150                                                              session_info->info->account_name);
 151         NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info->unix_name);
 152
 153         len = strlen(original_user_name) + 1;
 154         session_info->unix_info->sanitized_username = su = talloc_array(session_info->unix_info, char, len);
 155         NT_STATUS_HAVE_NO_MEMORY(su);
 156
 157         alpha_strcpy(su, original_user_name,
 158                      ". _-$", len);
 159
 160         return NT_STATUS_OK;
 161 }