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 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_AUTH
  30
  31 /*
  32   form a security_unix_token from the current security_token
  33 */
  34 NTSTATUS security_token_to_unix_token(TALLOC_CTX *mem_ctx,
  35                                       struct security_token *token,
  36                                       struct security_unix_token **sec)
  37 {
  38         uint32_t s, g;
  39         NTSTATUS status;
  40         struct id_map *ids;
  41         bool match;
  42
  43         match = security_token_is_system(token);
  44         if (match) {
  45                 /*
  46                  * SYSTEM user uid and gid is 0
  47                  */
  48
  49                 *sec = talloc_zero(mem_ctx, struct security_unix_token);
  50                 if (*sec == NULL) {
  51                         return NT_STATUS_NO_MEMORY;
  52                 }
  53
  54                 return NT_STATUS_OK;
  55         }
  56
  57         /* we can't do unix security without a user and group */
  58         if (token->num_sids < PRIMARY_SIDS_COUNT) {
  59                 return NT_STATUS_ACCESS_DENIED;
  60         }
  61
  62         *sec = talloc_zero(mem_ctx, struct security_unix_token);
  63         if (*sec == NULL) {
  64                 return NT_STATUS_NO_MEMORY;
  65         }
  66
  67         ids = talloc_zero_array(mem_ctx, struct id_map, token->num_sids);
  68         NT_STATUS_HAVE_NO_MEMORY(ids);
  69
  70         for (s=0; s < token->num_sids; s++) {
  71                 ids[s].sid = &token->sids[s];
  72                 ids[s].status = ID_UNKNOWN;
  73         }
  74
  75         status = wbc_sids_to_xids(ids, token->num_sids);
  76         NT_STATUS_NOT_OK_RETURN(status);
  77
  78         g = token->num_sids;
  79         if (ids[PRIMARY_USER_SID_INDEX].xid.type != ID_TYPE_BOTH) {
  80                 g--;
  81         }
  82         (*sec)->ngroups = g;
  83         (*sec)->groups = talloc_array(*sec, gid_t, (*sec)->ngroups);
  84         NT_STATUS_HAVE_NO_MEMORY((*sec)->groups);
  85
  86         g=0;
  87         if (ids[PRIMARY_USER_SID_INDEX].xid.type == ID_TYPE_BOTH) {
  88                 (*sec)->uid = ids[0].xid.id;
  89                 (*sec)->groups[g] = ids[0].xid.id;
  90                 g++;
  91         } else if (ids[PRIMARY_USER_SID_INDEX].xid.type == ID_TYPE_UID) {
  92                 (*sec)->uid = ids[0].xid.id;
  93         } else {
  94                 struct dom_sid_buf buf;
  95                 DEBUG(0, ("Unable to convert first SID (%s) in user token to a UID.  Conversion was returned as type %d, full token:\n",
  96                           dom_sid_str_buf(ids[PRIMARY_USER_SID_INDEX].sid, &buf),
  97                           (int)ids[PRIMARY_USER_SID_INDEX].xid.type));
  98                 security_token_debug(DBGC_AUTH, 0, token);
  99                 return NT_STATUS_INVALID_SID;
 100         }
 101
 102         if (ids[PRIMARY_GROUP_SID_INDEX].xid.type == ID_TYPE_BOTH ||
 103             ids[PRIMARY_GROUP_SID_INDEX].xid.type == ID_TYPE_GID) {
 104                 (*sec)->gid = ids[PRIMARY_GROUP_SID_INDEX].xid.id;
 105                 (*sec)->groups[g] = ids[PRIMARY_GROUP_SID_INDEX].xid.id;
 106                 g++;
 107         } else {
 108                 struct dom_sid_buf buf;
 109                 DEBUG(0, ("Unable to convert second SID (%s) in user token to a GID.  Conversion was returned as type %d, full token:\n",
 110                           dom_sid_str_buf(ids[PRIMARY_GROUP_SID_INDEX].sid, &buf),
 111                           (int)ids[PRIMARY_GROUP_SID_INDEX].xid.type));
 112                 security_token_debug(DBGC_AUTH, 0, token);
 113                 return NT_STATUS_INVALID_SID;
 114         }
 115
 116         for (s=REMAINING_SIDS_INDEX; s < token->num_sids; s++) {
 117                 if (ids[s].xid.type == ID_TYPE_BOTH ||
 118                     ids[s].xid.type == ID_TYPE_GID) {
 119                         (*sec)->groups[g] = ids[s].xid.id;
 120                         g++;
 121                 } else {
 122                         struct dom_sid_buf buf;
 123                         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",
 124                                   dom_sid_str_buf(ids[s].sid, &buf),
 125                                   (unsigned int)s, (int)ids[s].xid.type));
 126                         security_token_debug(DBGC_AUTH, 0, token);
 127                         return NT_STATUS_INVALID_SID;
 128                 }
 129         }
 130
 131         DEBUG(5, ("Successfully converted security token to a unix token:"));
 132         security_token_debug(0, 5, token);
 133         TALLOC_FREE(ids);
 134
 135         return NT_STATUS_OK;
 136 }
 137
 138 /*
 139  * Fill in the unix_info elements in a struct session_info
 140  */
 141 NTSTATUS fill_unix_info(struct loadparm_context *lp_ctx,
 142                         const char *original_user_name,
 143                         struct auth_session_info *session_info)
 144 {
 145         session_info->unix_info = talloc_zero(session_info,
 146                                               struct auth_user_info_unix);
 147         NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info);
 148
 149         session_info->unix_info->unix_name =
 150                 talloc_asprintf(session_info->unix_info,
 151                                 "%s%s%s", session_info->info->domain_name,
 152                                 lpcfg_winbind_separator(lp_ctx),
 153                                 session_info->info->account_name);
 154         NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info->unix_name);
 155
 156         if (original_user_name == NULL) {
 157                 original_user_name = session_info->unix_info->unix_name;
 158         }
 159
 160         session_info->unix_info->sanitized_username =
 161                 talloc_alpha_strcpy(session_info->unix_info,
 162                                     original_user_name,
 163                                     ". _-$");
 164         NT_STATUS_HAVE_NO_MEMORY(session_info->unix_info->sanitized_username);
 165
 166         return NT_STATUS_OK;
 167 }
 168
 169 /*
 170   Fill in the auth_user_info_unix and auth_unix_token elements in a struct session_info
 171 */
 172 NTSTATUS auth_session_info_fill_unix(struct loadparm_context *lp_ctx,
 173                                      const char *original_user_name,
 174                                      struct auth_session_info *session_info)
 175 {
 176         NTSTATUS status = NT_STATUS_OK;
 177
 178         status = security_token_to_unix_token(session_info,
 179                                               session_info->security_token,
 180                                               &session_info->unix_token);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 return status;
 183         }
 184
 185         status = fill_unix_info(lp_ctx,
 186                                 original_user_name,
 187                                 session_info);
 188         if (!NT_STATUS_IS_OK(status)) {
 189                 return status;
 190         }
 191
 192         return NT_STATUS_OK;
 193 }
 194
 195 /*
 196  * Set the given auth_user_info_unix and auth_unix_token elements in a
 197  * struct session_info, similar auth_session_info_fill_unix().
 198  * Receives the uid and gid for the unix token as parameters and does
 199  * not query the unix token from winbind (via security_token_to_unix_token()).
 200  * This is useful to fill a user session info manually if winbind is not
 201  * available.
 202  */
 203 NTSTATUS auth_session_info_set_unix(struct loadparm_context *lp_ctx,
 204                                     const char *original_user_name,
 205                                     int uid,
 206                                     int gid,
 207                                     struct auth_session_info *session_info)
 208 {
 209         NTSTATUS status;
 210
 211         session_info->unix_token = talloc_zero(session_info,
 212                                                struct security_unix_token);
 213         if (session_info->unix_token == NULL) {
 214                 return NT_STATUS_NO_MEMORY;
 215         }
 216
 217         session_info->unix_token->uid = uid;
 218         session_info->unix_token->gid = gid;
 219
 220         status = fill_unix_info(lp_ctx,
 221                                 original_user_name,
 222                                 session_info);
 223         if (!NT_STATUS_IS_OK(status)) {
 224                 return status;
 225         }
 226
 227         return NT_STATUS_OK;
 228 }