source3/auth/auth_ntlmssp.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, server side
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett 2001-2005,2011
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "auth.h"
  26 #include "libcli/security/security.h"
  27 #include "lib/util/tevent_ntstatus.h"
  28 #include "source3/lib/substitute.h"
  29
  30 NTSTATUS auth3_generate_session_info(struct auth4_context *auth_context,
  31                                      TALLOC_CTX *mem_ctx,
  32                                      void *server_returned_info,
  33                                      const char *original_user_name,
  34                                      uint32_t session_info_flags,
  35                                      struct auth_session_info **session_info)
  36 {
  37         struct auth_user_info_dc *user_info = NULL;
  38         struct auth_serversupplied_info *server_info = NULL;
  39         NTSTATUS nt_status;
  40
  41         /*
  42          * This is a hack, some callers...
  43          *
  44          * Some callers pass auth_user_info_dc, the SCHANNEL and
  45          * NCALRPC_AS_SYSTEM gensec modules.
  46          *
  47          * While the rest passes auth3_check_password() returned.
  48          */
  49         user_info = talloc_get_type(server_returned_info,
  50                                     struct auth_user_info_dc);
  51         if (user_info != NULL) {
  52                 const struct dom_sid *sid;
  53                 int cmp;
  54
  55                 /*
  56                  * This should only be called from SCHANNEL or NCALRPC_AS_SYSTEM
  57                  */
  58                 if (user_info->num_sids != 1) {
  59                         return NT_STATUS_INTERNAL_ERROR;
  60                 }
  61                 sid = &user_info->sids[PRIMARY_USER_SID_INDEX].sid;
  62
  63                 cmp = dom_sid_compare(sid, &global_sid_System);
  64                 if (cmp == 0) {
  65                         return make_session_info_system(mem_ctx, session_info);
  66                 }
  67
  68                 cmp = dom_sid_compare(sid, &global_sid_Anonymous);
  69                 if (cmp == 0) {
  70                         return make_session_info_anonymous(mem_ctx, session_info);
  71                 }
  72
  73                 return NT_STATUS_INTERNAL_ERROR;
  74         }
  75
  76         server_info = talloc_get_type_abort(server_returned_info,
  77                                             struct auth_serversupplied_info);
  78         nt_status = create_local_token(mem_ctx,
  79                                        server_info,
  80                                        NULL,
  81                                        original_user_name,
  82                                        session_info);
  83         if (!NT_STATUS_IS_OK(nt_status)) {
  84                 DEBUG(10, ("create_local_token failed: %s\n",
  85                            nt_errstr(nt_status)));
  86                 return nt_status;
  87         }
  88
  89         return NT_STATUS_OK;
  90 }
  91
  92 /**
  93  * Return the challenge as determined by the authentication subsystem
  94  * @return an 8 byte random challenge
  95  */
  96
  97 NTSTATUS auth3_get_challenge(struct auth4_context *auth4_context,
  98                                            uint8_t chal[8])
  99 {
 100         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 101                                                                   struct auth_context);
 102         auth_get_ntlm_challenge(auth_context, chal);
 103         return NT_STATUS_OK;
 104 }
 105
 106 /**
 107  * NTLM2 authentication modifies the effective challenge,
 108  * @param challenge The new challenge value
 109  */
 110 NTSTATUS auth3_set_challenge(struct auth4_context *auth4_context, const uint8_t *chal,
 111                              const char *challenge_set_by)
 112 {
 113         struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
 114                                                                   struct auth_context);
 115         bool ok;
 116
 117         ok = auth3_context_set_challenge(auth_context, chal, challenge_set_by);
 118         if (!ok) {
 119                 /*
 120                  * This can only fail for ENOMEM
 121                  */
 122                 return NT_STATUS_NO_MEMORY;
 123         }
 124
 125         DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
 126         DEBUG(5, ("challenge is: \n"));
 127         dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
 128         return NT_STATUS_OK;
 129 }
 130
 131 /**
 132  * Check the password on an NTLMSSP login.
 133  *
 134  * Return the session keys used on the connection.
 135  */
 136
 137 struct auth3_check_password_state {
 138         uint8_t authoritative;
 139         void *server_info;
 140         DATA_BLOB nt_session_key;
 141         DATA_BLOB lm_session_key;
 142 };
 143
 144 struct tevent_req *auth3_check_password_send(
 145         TALLOC_CTX *mem_ctx,
 146         struct tevent_context *ev,
 147         struct auth4_context *auth4_context,
 148         const struct auth_usersupplied_info *user_info)
 149 {
 150         struct tevent_req *req = NULL;
 151         struct auth3_check_password_state *state = NULL;
 152         struct auth_context *auth_context = talloc_get_type_abort(
 153                 auth4_context->private_data, struct auth_context);
 154         struct auth_usersupplied_info *mapped_user_info = NULL;
 155         struct auth_serversupplied_info *server_info = NULL;
 156         char *sanitized_username = NULL;
 157         NTSTATUS nt_status;
 158         bool username_was_mapped;
 159
 160         req = tevent_req_create(
 161                 mem_ctx, &state, struct auth3_check_password_state);
 162         if (req == NULL) {
 163                 return NULL;
 164         }
 165
 166         /*
 167          * Be authoritative by default.
 168          */
 169         state->authoritative = 1;
 170
 171         /* The client has given us its machine name (which we only get over NBT transport).
 172            We need to possibly reload smb.conf if smb.conf includes depend on the machine name. */
 173
 174         set_remote_machine_name(user_info->workstation_name, True);
 175
 176         nt_status = make_user_info_map(talloc_tos(),
 177                                        &mapped_user_info,
 178                                        user_info->client.account_name,
 179                                        user_info->client.domain_name,
 180                                        user_info->workstation_name,
 181                                        user_info->remote_host,
 182                                        user_info->local_host,
 183                                        user_info->service_description,
 184                                        user_info->password.response.lanman.data ? &user_info->password.response.lanman : NULL,
 185                                        user_info->password.response.nt.data ? &user_info->password.response.nt : NULL,
 186                                        NULL, NULL, NULL,
 187                                        AUTH_PASSWORD_RESPONSE);
 188
 189         if (tevent_req_nterror(req, nt_status)) {
 190                 return tevent_req_post(req, ev);
 191         }
 192
 193         mapped_user_info->logon_parameters = user_info->logon_parameters;
 194
 195         mapped_user_info->flags = user_info->flags;
 196
 197         sanitized_username = talloc_alpha_strcpy(
 198                 state,
 199                 user_info->client.account_name,
 200                 SAFE_NETBIOS_CHARS "$");
 201         if (sanitized_username == NULL) {
 202                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 203                 return tevent_req_post(req, ev);
 204         }
 205
 206         nt_status = auth_check_ntlm_password(state,
 207                                              auth_context,
 208                                              mapped_user_info,
 209                                              &server_info,
 210                                              &state->authoritative);
 211
 212         if (!NT_STATUS_IS_OK(nt_status)) {
 213                 DBG_INFO("Checking NTLMSSP password for %s\\%s failed: "
 214                          "%s, authoritative=%"PRIu8"\n",
 215                          user_info->client.domain_name,
 216                          user_info->client.account_name,
 217                          nt_errstr(nt_status),
 218                          state->authoritative);
 219         }
 220
 221         username_was_mapped = mapped_user_info->was_mapped;
 222
 223         TALLOC_FREE(mapped_user_info);
 224
 225         if (!NT_STATUS_IS_OK(nt_status)) {
 226                 nt_status = do_map_to_guest_server_info(
 227                         state,
 228                         nt_status,
 229                         user_info->client.account_name,
 230                         user_info->client.domain_name,
 231                         &server_info);
 232                 if (!tevent_req_nterror(req, nt_status)) {
 233                         state->authoritative = 1;
 234
 235                         /* setup the string used by %U */
 236                         set_current_user_info(
 237                                 sanitized_username,
 238                                 server_info->unix_name,
 239                                 server_info->info3->base.logon_domain.string);
 240
 241                         lp_load_with_shares(get_dyn_CONFIGFILE());
 242
 243                         tevent_req_done(req);
 244                 }
 245                 state->server_info = server_info;
 246                 return tevent_req_post(req, ev);
 247         }
 248
 249         server_info->nss_token |= username_was_mapped;
 250
 251         /* setup the string used by %U */
 252         set_current_user_info(sanitized_username,
 253                               server_info->unix_name,
 254                               server_info->info3->base.logon_domain.string);
 255
 256         lp_load_with_shares(get_dyn_CONFIGFILE());
 257
 258         /* Clear out the session keys, and pass them to the caller.
 259          * They will not be used in this form again - instead the
 260          * NTLMSSP code will decide on the final correct session key,
 261          * and supply it to create_local_token() */
 262
 263         DBG_DEBUG("Got NT session key of length %zu\n",
 264                   server_info->session_key.length);
 265         state->nt_session_key = (DATA_BLOB) {
 266                 .data = talloc_move(
 267                         state, &server_info->session_key.data),
 268                 .length = server_info->session_key.length,
 269         };
 270         server_info->session_key = data_blob_null;
 271
 272         DBG_DEBUG("Got LM session key of length %zu\n",
 273                   server_info->lm_session_key.length);
 274         state->lm_session_key = (DATA_BLOB) {
 275                 .data = talloc_move(
 276                         state, &server_info->lm_session_key.data),
 277                 .length = server_info->lm_session_key.length,
 278         };
 279         server_info->lm_session_key = data_blob_null;
 280
 281         state->server_info = server_info;
 282
 283         tevent_req_done(req);
 284         return tevent_req_post(req, ev);
 285 }
 286
 287 NTSTATUS auth3_check_password_recv(struct tevent_req *req,
 288                                    TALLOC_CTX *mem_ctx,
 289                                    uint8_t *pauthoritative,
 290                                    void **server_returned_info,
 291                                    DATA_BLOB *nt_session_key,
 292                                    DATA_BLOB *lm_session_key)
 293 {
 294         struct auth3_check_password_state *state = tevent_req_data(
 295                 req, struct auth3_check_password_state);
 296         NTSTATUS status;
 297
 298         if (pauthoritative != NULL) {
 299                 *pauthoritative = state->authoritative;
 300         }
 301
 302         if (tevent_req_is_nterror(req, &status)) {
 303                 return status;
 304         }
 305
 306         if (server_returned_info != NULL) {
 307                 *server_returned_info = talloc_move(
 308                         mem_ctx, &state->server_info);
 309         }
 310         if (nt_session_key != NULL) {
 311                 *nt_session_key = (DATA_BLOB) {
 312                         .data = talloc_move(
 313                                 mem_ctx, &state->nt_session_key.data),
 314                         .length = state->nt_session_key.length,
 315                 };
 316         }
 317         if (lm_session_key != NULL) {
 318                 *lm_session_key = (DATA_BLOB) {
 319                         .data = talloc_move(
 320                                 mem_ctx, &state->lm_session_key.data),
 321                         .length = state->lm_session_key.length,
 322                 };
 323         }
 324
 325         return NT_STATUS_OK;
 326 }